Changeset 1765 in MondoRescue for branches/2.2.5/mindi-busybox/networking/httpd.c

Timestamp:

Nov 4, 2007, 3:16:40 AM (16 years ago)

Author:

Bruno Cornec

Message:

Update to busybox 1.7.2

File:

• branches/2.2.5/mindi-busybox/networking/httpd.c (modified) (6 diffs)

branches/2.2.5/mindi-busybox/networking/httpd.c

@@ -21 +21 @@
  *
  *
- * When a url contains "cgi-bin" it is assumed to be a cgi script.  The
+ * When a url starts by "/cgi-bin/" it is assumed to be a cgi script.  The
  * server changes directory to the location of the script and executes it
  * after setting QUERY_STRING and other environment variables.
+ *
+ * Doc:
+ * "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html
  *
  * The server can also be invoked as a url arg decoder and html text encoder
@@ -40 +43 @@
  * A:127.0.0.1       # Allow local loopback connections
  * D:*               # Deny from other IP connections
+ * E404:/path/e404.html # /path/e404.html is the 404 (not found) error page
  * /cgi-bin:foo:bar  # Require user foo, pwd bar on urls starting with /cgi-bin/
  * /adm:admin:setup  # Require user admin, pwd setup on urls starting with /adm/
@@ -82 +86 @@
  * result, the subdir settings only have a lifetime of a single request.
  *
+ * Custom error pages can contain an absolute path or be relative to
+ * 'home_httpd'. Error pages are to be static files (no CGI or script). Error
+ * page can only be defined in the root configuration file and are not taken
+ * into account in local (directories) config files.
  *
  * If -c is not set, an attempt will be made to open the default
@@ -87 +95 @@
  * server exits with an error.
  *
-*/
-
-
-#include <stdio.h>
-#include <ctype.h>         /* for isspace           */
-#include <string.h>
-#include <stdlib.h>        /* for malloc            */
-#include <time.h>
-#include <unistd.h>        /* for close             */
-#include <signal.h>
-#include <sys/types.h>
-#include <sys/socket.h>    /* for connect and socket*/
-#include <netinet/in.h>    /* for sockaddr_in       */
-#include <sys/stat.h>
-#include <sys/wait.h>
-#include <fcntl.h>         /* for open modes        */
-#include "busybox.h"
-
-
-static const char httpdVersion[] = "busybox httpd/1.35 6-Oct-2004";
-static const char default_path_httpd_conf[] = "/etc";
-static const char httpd_conf[] = "httpd.conf";
-static const char home[] = "./";
-
-#ifdef CONFIG_LFS
-# define cont_l_fmt "%lld"
-# define cont_l_type (long long)
-#else
-# define cont_l_fmt "%ld"
-# define cont_l_type (long)
-#endif
-
-#define TIMEOUT 60
-
-// Note: busybox xfuncs are not used because we want the server to keep running
-//       if something bad happens due to a malformed user request.
-//       As a result, all memory allocation after daemonize
-//       is checked rigorously
+ */
+
+#include "libbb.h"
+#if ENABLE_FEATURE_HTTPD_USE_SENDFILE
+#include <sys/sendfile.h>
+#endif
 
 //#define DEBUG 1
-
-#ifndef DEBUG
-# define DEBUG 0
-#endif
-
-#define MAX_MEMORY_BUFF 8192    /* IO buffer */
-
-typedef struct HT_ACCESS {
+#define DEBUG 0
+
+/* amount of buffering in a pipe */
+#ifndef PIPE_BUF
+# define PIPE_BUF 4096
+#endif
+
+#define IOBUF_SIZE 8192    /* IO buffer */
+
+#define HEADER_READ_TIMEOUT 60
+
+static const char default_path_httpd_conf[] ALIGN1 = "/etc";
+static const char httpd_conf[] ALIGN1 = "httpd.conf";
+static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
+
+typedef struct has_next_ptr {
+    struct has_next_ptr *next;
+} has_next_ptr;
+
+/* Must have "next" as a first member */
+typedef struct Htaccess {
+    struct Htaccess *next;
     char *after_colon;
-    struct HT_ACCESS *next;
-    char before_colon[1];         /* really bigger, must last */
+    char before_colon[1];  /* really bigger, must be last */
 } Htaccess;
 
-typedef struct HT_ACCESS_IP {
-    unsigned int ip;
-    unsigned int mask;
+/* Must have "next" as a first member */
+typedef struct Htaccess_IP {
+    struct Htaccess_IP *next;
+    unsigned ip;
+    unsigned mask;
     int allow_deny;
-    struct HT_ACCESS_IP *next;
 } Htaccess_IP;
 
-typedef struct
-{
-  char buf[MAX_MEMORY_BUFF];
-
-  USE_FEATURE_HTTPD_BASIC_AUTH(const char *realm;)
-  USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
-
-  const char *query;
-
-  USE_FEATURE_HTTPD_CGI(char *referer;)
-
-  const char *configFile;
-
-  unsigned int rmt_ip;
-#if defined(CONFIG_FEATURE_HTTPD_CGI) || DEBUG
-  char rmt_ip_str[16];     /* for set env REMOTE_ADDR */
-#endif
-  unsigned port;           /* server initial port and for
-                  set env REMOTE_PORT */
-  union HTTPD_FOUND {
+enum {
+    HTTP_OK = 200,
+    HTTP_MOVED_TEMPORARILY = 302,
+    HTTP_BAD_REQUEST = 400,       /* malformed syntax */
+    HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
+    HTTP_NOT_FOUND = 404,
+    HTTP_FORBIDDEN = 403,
+    HTTP_REQUEST_TIMEOUT = 408,
+    HTTP_NOT_IMPLEMENTED = 501,   /* used for unrecognized requests */
+    HTTP_INTERNAL_SERVER_ERROR = 500,
+    HTTP_CONTINUE = 100,
+#if 0   /* future use */
+    HTTP_SWITCHING_PROTOCOLS = 101,
+    HTTP_CREATED = 201,
+    HTTP_ACCEPTED = 202,
+    HTTP_NON_AUTHORITATIVE_INFO = 203,
+    HTTP_NO_CONTENT = 204,
+    HTTP_MULTIPLE_CHOICES = 300,
+    HTTP_MOVED_PERMANENTLY = 301,
+    HTTP_NOT_MODIFIED = 304,
+    HTTP_PAYMENT_REQUIRED = 402,
+    HTTP_BAD_GATEWAY = 502,
+    HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
+    HTTP_RESPONSE_SETSIZE = 0xffffffff
+#endif
+};
+
+static const uint16_t http_response_type[] ALIGN2 = {
+    HTTP_OK,
+    HTTP_MOVED_TEMPORARILY,
+    HTTP_REQUEST_TIMEOUT,
+    HTTP_NOT_IMPLEMENTED,
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH 
+    HTTP_UNAUTHORIZED,
+#endif
+    HTTP_NOT_FOUND,
+    HTTP_BAD_REQUEST,
+    HTTP_FORBIDDEN,
+    HTTP_INTERNAL_SERVER_ERROR,
+#if 0   /* not implemented */
+    HTTP_CREATED,
+    HTTP_ACCEPTED,
+    HTTP_NO_CONTENT,
+    HTTP_MULTIPLE_CHOICES,
+    HTTP_MOVED_PERMANENTLY,
+    HTTP_NOT_MODIFIED,
+    HTTP_BAD_GATEWAY,
+    HTTP_SERVICE_UNAVAILABLE,
+#endif
+};
+
+static const struct {
+    const char *name;
+    const char *info;
+} http_response[ARRAY_SIZE(http_response_type)] = {
+    { "OK", NULL },
+    { "Found", "Directories must end with a slash" }, /* ?? */
+    { "Request Timeout", "No request appeared within 60 seconds" },
+    { "Not Implemented", "The requested method is not recognized" },
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+    { "Unauthorized", "" },
+#endif
+    { "Not Found", "The requested URL was not found" },
+    { "Bad Request", "Unsupported method" },
+    { "Forbidden", ""  },
+    { "Internal Server Error", "Internal Server Error" },
+#if 0   /* not implemented */
+    { "Created" },
+    { "Accepted" },
+    { "No Content" },
+    { "Multiple Choices" },
+    { "Moved Permanently" },
+    { "Not Modified" },
+    { "Bad Gateway", "" },
+    { "Service Unavailable", "" },
+#endif
+};
+
+struct globals {
+    int verbose;            /* must be int (used by getopt32) */
+    smallint flg_deny_all;
+
+    unsigned rmt_ip;    /* used for IP-based allow/deny rules */
+    time_t last_mod;
+    off_t ContentLength;    /* -1 - unknown */
+    char *rmt_ip_str;       /* for $REMOTE_ADDR and $REMOTE_PORT */
+    const char *bind_addr_or_port;
+
+    const char *g_query;
+    const char *configFile;
+    const char *home_httpd;
+
     const char *found_mime_type;
     const char *found_moved_temporarily;
-  } httpd_found;
-
-  off_t ContentLength;          /* -1 - unknown */
-  time_t last_mod;
-
-  Htaccess_IP *ip_a_d;          /* config allow/deny lines */
-  int flg_deny_all;
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-  Htaccess *auth;               /* config user:password lines */
-#endif
-#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
-  Htaccess *mime_a;             /* config mime types */
-#endif
-
-#ifdef CONFIG_FEATURE_HTTPD_WITHOUT_INETD
-  int accepted_socket;
-# define a_c_r config->accepted_socket
-# define a_c_w config->accepted_socket
-#else
-# define a_c_r 0
-# define a_c_w 1
-#endif
-  volatile int alarm_signaled;
-
-#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
-  Htaccess *script_i;           /* config script interpreters */
-#endif
-} HttpdConfig;
-
-static HttpdConfig *config;
-
-static const char request_GET[] = "GET";    /* size algorithmic optimize */
-
-static const char* const suffixTable [] = {
-/* Warning: shorted equivalent suffix in one line must be first */
-  ".htm.html", "text/html",
-  ".jpg.jpeg", "image/jpeg",
-  ".gif", "image/gif",
-  ".png", "image/png",
-  ".txt.h.c.cc.cpp", "text/plain",
-  ".css", "text/css",
-  ".wav", "audio/wav",
-  ".avi", "video/x-msvideo",
-  ".qt.mov", "video/quicktime",
-  ".mpe.mpeg", "video/mpeg",
-  ".mid.midi", "audio/midi",
-  ".mp3", "audio/mpeg",
-#if 0                        /* unpopular */
-  ".au", "audio/basic",
-  ".pac", "application/x-ns-proxy-autoconfig",
-  ".vrml.wrl", "model/vrml",
-#endif
-  0, "application/octet-stream" /* default */
-  };
-
-typedef enum
-{
-  HTTP_OK = 200,
-  HTTP_MOVED_TEMPORARILY = 302,
-  HTTP_BAD_REQUEST = 400,       /* malformed syntax */
-  HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
-  HTTP_NOT_FOUND = 404,
-  HTTP_FORBIDDEN = 403,
-  HTTP_REQUEST_TIMEOUT = 408,
-  HTTP_NOT_IMPLEMENTED = 501,   /* used for unrecognized requests */
-  HTTP_INTERNAL_SERVER_ERROR = 500,
-#if 0 /* future use */
-  HTTP_CONTINUE = 100,
-  HTTP_SWITCHING_PROTOCOLS = 101,
-  HTTP_CREATED = 201,
-  HTTP_ACCEPTED = 202,
-  HTTP_NON_AUTHORITATIVE_INFO = 203,
-  HTTP_NO_CONTENT = 204,
-  HTTP_MULTIPLE_CHOICES = 300,
-  HTTP_MOVED_PERMANENTLY = 301,
-  HTTP_NOT_MODIFIED = 304,
-  HTTP_PAYMENT_REQUIRED = 402,
-  HTTP_BAD_GATEWAY = 502,
-  HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
-  HTTP_RESPONSE_SETSIZE=0xffffffff
-#endif
-} HttpResponseNum;
-
-typedef struct
-{
-  HttpResponseNum type;
-  const char *name;
-  const char *info;
-} HttpEnumString;
-
-static const HttpEnumString httpResponseNames[] = {
-  { HTTP_OK, "OK", NULL },
-  { HTTP_MOVED_TEMPORARILY, "Found", "Directories must end with a slash." },
-  { HTTP_REQUEST_TIMEOUT, "Request Timeout",
-    "No request appeared within a reasonable time period." },
-  { HTTP_NOT_IMPLEMENTED, "Not Implemented",
-    "The requested method is not recognized by this server." },
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-  { HTTP_UNAUTHORIZED, "Unauthorized", "" },
-#endif
-  { HTTP_NOT_FOUND, "Not Found",
-    "The requested URL was not found on this server." },
-  { HTTP_BAD_REQUEST, "Bad Request", "Unsupported method." },
-  { HTTP_FORBIDDEN, "Forbidden", "" },
-  { HTTP_INTERNAL_SERVER_ERROR, "Internal Server Error",
-    "Internal Server Error" },
-#if 0                               /* not implemented */
-  { HTTP_CREATED, "Created" },
-  { HTTP_ACCEPTED, "Accepted" },
-  { HTTP_NO_CONTENT, "No Content" },
-  { HTTP_MULTIPLE_CHOICES, "Multiple Choices" },
-  { HTTP_MOVED_PERMANENTLY, "Moved Permanently" },
-  { HTTP_NOT_MODIFIED, "Not Modified" },
-  { HTTP_BAD_GATEWAY, "Bad Gateway", "" },
-  { HTTP_SERVICE_UNAVAILABLE, "Service Unavailable", "" },
+    Htaccess_IP *ip_a_d;    /* config allow/deny lines */
+
+    USE_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
+    USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
+    USE_FEATURE_HTTPD_CGI(char *referer;)
+    USE_FEATURE_HTTPD_CGI(char *user_agent;)
+
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+    Htaccess *g_auth;       /* config user:password lines */
+#endif
+#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
+    Htaccess *mime_a;       /* config mime types */
+#endif
+#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
+    Htaccess *script_i;     /* config script interpreters */
+#endif
+    char *iobuf;            /* [IOBUF_SIZE] */
+#define hdr_buf bb_common_bufsiz1
+    char *hdr_ptr;
+    int hdr_cnt;
+#if ENABLE_FEATURE_HTTPD_ERROR_PAGES
+    const char *http_error_page[ARRAY_SIZE(http_response_type)];
 #endif
 };
-
-
-static const char RFC1123FMT[] = "%a, %d %b %Y %H:%M:%S GMT";
-static const char Content_length[] = "Content-length:";
-
-
-static int
-scan_ip (const char **ep, unsigned int *ip, unsigned char endc)
-{
-  const char *p = *ep;
-  int auto_mask = 8;
-  int j;
-
-  *ip = 0;
-  for (j = 0; j < 4; j++) {
-    unsigned int octet;
-
-    if ((*p < '0' || *p > '9') && (*p != '/' || j == 0) && *p != 0)
-      return -auto_mask;
-    octet = 0;
-    while (*p >= '0' && *p <= '9') {
-      octet *= 10;
-      octet += *p - '0';
-      if (octet > 255)
+#define G (*ptr_to_globals)
+#define verbose           (G.verbose          )
+#define flg_deny_all      (G.flg_deny_all     )
+#define rmt_ip            (G.rmt_ip           )
+#define bind_addr_or_port (G.bind_addr_or_port)
+#define g_query           (G.g_query          )
+#define configFile        (G.configFile       )
+#define home_httpd        (G.home_httpd       )
+#define found_mime_type   (G.found_mime_type  )
+#define found_moved_temporarily (G.found_moved_temporarily)
+#define ContentLength     (G.ContentLength    )
+#define last_mod          (G.last_mod         )
+#define ip_a_d            (G.ip_a_d           )
+#define g_realm           (G.g_realm          )
+#define remoteuser        (G.remoteuser       )
+#define referer           (G.referer          )
+#define user_agent        (G.user_agent       )
+#define rmt_ip_str        (G.rmt_ip_str       )
+#define g_auth            (G.g_auth           )
+#define mime_a            (G.mime_a           )
+#define script_i          (G.script_i         )
+#define iobuf             (G.iobuf            )
+#define hdr_ptr           (G.hdr_ptr          )
+#define hdr_cnt           (G.hdr_cnt          )
+#define http_error_page   (G.http_error_page  )
+#define INIT_G() do { \
+    PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
+    USE_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
+    bind_addr_or_port = "80"; \
+    ContentLength = -1; \
+} while (0)
+
+
+#define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
+
+/* Prototypes */
+static void send_file_and_exit(const char *url, int headers) ATTRIBUTE_NORETURN;
+
+static void free_llist(has_next_ptr **pptr)
+{
+    has_next_ptr *cur = *pptr;
+    while (cur) {
+        has_next_ptr *t = cur;
+        cur = cur->next;
+        free(t);
+    }
+    *pptr = NULL;
+}
+
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
+ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
+ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
+static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
+{
+    free_llist((has_next_ptr**)pptr);
+}
+#endif
+
+static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
+{
+    free_llist((has_next_ptr**)pptr);
+}
+
+/* Returns presumed mask width in bits or < 0 on error.
+ * Updates strp, stores IP at provided pointer */
+static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
+{
+    const char *p = *strp;
+    int auto_mask = 8;
+    unsigned ip = 0;
+    int j;
+
+    if (*p == '/')
         return -auto_mask;
-      p++;
-    }
-    if (*p == '.')
-      p++;
-    if (*p != '/' && *p != 0)
-      auto_mask += 8;
-    *ip = ((*ip) << 8) | octet;
-  }
-  if (*p != 0) {
-    if (*p != endc)
-        return -auto_mask;
-    p++;
-    if(*p == 0)
-        return -auto_mask;
-  }
-  *ep = p;
-  return auto_mask;
-}
-
-static int
-scan_ip_mask (const char *ipm, unsigned int *ip, unsigned int *mask)
-{
-  int i;
-  unsigned int msk;
-
-  i = scan_ip(&ipm, ip, '/');
-  if(i < 0)
-    return i;
-  if(*ipm) {
-    const char *p = ipm;
-
-    i = 0;
-    while (*p) {
-        if (*p < '0' || *p > '9') {
-            if (*p == '.') {
-                i = scan_ip (&ipm, mask, 0);
-                return i != 32;
-            }
+
+    for (j = 0; j < 4; j++) {
+        unsigned octet;
+
+        if ((*p < '0' || *p > '9') && *p != '/' && *p)
+            return -auto_mask;
+        octet = 0;
+        while (*p >= '0' && *p <= '9') {
+            octet *= 10;
+            octet += *p - '0';
+            if (octet > 255)
+                return -auto_mask;
+            p++;
+        }
+        if (*p == '.')
+            p++;
+        if (*p != '/' && *p)
+            auto_mask += 8;
+        ip = (ip << 8) | octet;
+    }
+    if (*p) {
+        if (*p != endc)
+            return -auto_mask;
+        p++;
+        if (*p == '\0')
+            return -auto_mask;
+    }
+    *ipp = ip;
+    *strp = p;
+    return auto_mask;
+}
+
+/* Returns 0 on success. Stores IP and mask at provided pointers */
+static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
+{
+    int i;
+    unsigned mask;
+    char *p;
+
+    i = scan_ip(&str, ipp, '/');
+    if (i < 0)
+        return i;
+
+    if (*str) {
+        /* there is /xxx after dotted-IP address */
+        i = bb_strtou(str, &p, 10);
+        if (*p == '.') {
+            /* 'xxx' itself is dotted-IP mask, parse it */
+            /* (return 0 (success) only if it has N.N.N.N form) */
+            return scan_ip(&str, maskp, '\0') - 32;
+        }
+        if (*p)
             return -1;
-        }
-        i *= 10;
-        i += *p - '0';
-        p++;
-    }
-  }
-  if (i > 32 || i < 0)
-      return -1;
-  msk = 0x80000000;
-  *mask = 0;
-  while (i > 0) {
-    *mask |= msk;
-    msk >>= 1;
-    i--;
-  }
-  return 0;
-}
-
-#if defined(CONFIG_FEATURE_HTTPD_BASIC_AUTH) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES)
-static void free_config_lines(Htaccess **pprev)
-{
-    Htaccess *prev = *pprev;
-
-    while( prev ) {
-    Htaccess *cur = prev;
-
-    prev = cur->next;
-    free(cur);
-    }
-    *pprev = NULL;
-}
-#endif
-
+    }
+
+    if (i > 32)
+        return -1;
+
+    if (sizeof(unsigned) == 4 && i == 32) {
+        /* mask >>= 32 below may not work */
+        mask = 0;
+    } else {
+        mask = 0xffffffff;
+        mask >>= i;
+    }
+    /* i == 0 -> *maskp = 0x00000000
+     * i == 1 -> *maskp = 0x80000000
+     * i == 4 -> *maskp = 0xf0000000
+     * i == 31 -> *maskp = 0xfffffffe
+     * i == 32 -> *maskp = 0xffffffff */
+    *maskp = (uint32_t)(~mask);
+    return 0;
+}
+
+/*
+ * Parse configuration file into in-memory linked list.
+ *
+ * The first non-white character is examined to determine if the config line
+ * is one of the following:
+ *    .ext:mime/type   # new mime type not compiled into httpd
+ *    [adAD]:from      # ip address allow/deny, * for wildcard
+ *    /path:user:pass  # username/password
+ *    Ennn:error.html  # error page for status nnn
+ *
+ * Any previous IP rules are discarded.
+ * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
+ * are also discarded.  That is, previous settings are retained if flag is
+ * SUBDIR_PARSE.
+ * Error pages are only parsed on the main config file.
+ *
+ * path   Path where to look for httpd.conf (without filename).
+ * flag   Type of the parse request.
+ */
 /* flag */
 #define FIRST_PARSE          0
@@ -388 +427 @@
 #define SIGNALED_PARSE       2
 #define FIND_FROM_HTTPD_ROOT 3
-/****************************************************************************
- *
- > $Function: parse_conf()
- *
- * $Description: parse configuration file into in-memory linked list.
- *
- * The first non-white character is examined to determine if the config line
- * is one of the following:
- *    .ext:mime/type   # new mime type not compiled into httpd
- *    [adAD]:from      # ip address allow/deny, * for wildcard
- *    /path:user:pass  # username/password
- *
- * Any previous IP rules are discarded.
- * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
- * are also discarded.  That is, previous settings are retained if flag is
- * SUBDIR_PARSE.
- *
- * $Parameters:
- *      (const char *) path . . null for ip address checks, path for password
- *                              checks.
- *      (int) flag  . . . . . . the source of the parse request.
- *
- * $Return: (None)
- *
- ****************************************************************************/
 static void parse_conf(const char *path, int flag)
 {
-    FILE *f;
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-    Htaccess *prev, *cur;
-#elif CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
-    Htaccess *cur;
-#endif
-
-    const char *cf = config->configFile;
-    char buf[160];
-    char *p0 = NULL;
-    char *c, *p;
-
-    /* free previous ip setup if present */
-    Htaccess_IP *pip = config->ip_a_d;
-
-    while( pip ) {
-    Htaccess_IP *cur_ipl = pip;
-
-    pip = cur_ipl->next;
-    free(cur_ipl);
-    }
-    config->ip_a_d = NULL;
-
-    config->flg_deny_all = 0;
-
-#if defined(CONFIG_FEATURE_HTTPD_BASIC_AUTH) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR)
-    /* retain previous auth and mime config only for subdir parse */
-    if(flag != SUBDIR_PARSE) {
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-    free_config_lines(&config->auth);
-#endif
-#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
-    free_config_lines(&config->mime_a);
-#endif
-#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
-    free_config_lines(&config->script_i);
-#endif
-    }
-#endif
-
-    if(flag == SUBDIR_PARSE || cf == NULL) {
-    cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
-    if(cf == NULL) {
-        if(flag == FIRST_PARSE)
-        bb_error_msg_and_die(bb_msg_memory_exhausted);
-        return;
-    }
-    sprintf((char *)cf, "%s/%s", path, httpd_conf);
-    }
-
-    while((f = fopen(cf, "r")) == NULL) {
-    if(flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
-        /* config file not found, no changes to config */
-        return;
-    }
-    if(config->configFile && flag == FIRST_PARSE) /* if -c option given */
-        bb_perror_msg_and_die("%s", cf);
-    flag = FIND_FROM_HTTPD_ROOT;
-    cf = httpd_conf;
-    }
-
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-    prev = config->auth;
-#endif
-    /* This could stand some work */
-    while ( (p0 = fgets(buf, sizeof(buf), f)) != NULL) {
-    c = NULL;
-    for(p = p0; *p0 != 0 && *p0 != '#'; p0++) {
-        if(!isspace(*p0)) {
-            *p++ = *p0;
-            if(*p0 == ':' && c == NULL)
-            c = p;
-        }
-    }
-    *p = 0;
-
-    /* test for empty or strange line */
-    if (c == NULL || *c == 0)
-        continue;
-    p0 = buf;
-    if(*p0 == 'd')
-        *p0 = 'D';
-    if(*c == '*') {
-        if(*p0 == 'D') {
-        /* memorize deny all */
-        config->flg_deny_all++;
-        }
-        /* skip default other "word:*" config lines */
-        continue;
-    }
-
-    if(*p0 == 'a')
-        *p0 = 'A';
-    else if(*p0 != 'D' && *p0 != 'A'
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-       && *p0 != '/'
-#endif
-#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
-       && *p0 != '.'
-#endif
-#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
-       && *p0 != '*'
-#endif
-      )
-           continue;
-    if(*p0 == 'A' || *p0 == 'D') {
-        /* storing current config IP line */
-        pip = calloc(1, sizeof(Htaccess_IP));
-        if(pip) {
-            if(scan_ip_mask (c, &(pip->ip), &(pip->mask))) {
-            /* syntax IP{/mask} error detected, protect all */
+    FILE *f;
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+    Htaccess *prev;
+#endif
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
+ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
+ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
+    Htaccess *cur;
+#endif
+    const char *cf = configFile;
+    char buf[160];
+    char *p0 = NULL;
+    char *c, *p;
+    Htaccess_IP *pip;
+
+    /* discard old rules */
+    free_Htaccess_IP_list(&ip_a_d);
+    flg_deny_all = 0;
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
+ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
+ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
+    /* retain previous auth and mime config only for subdir parse */
+    if (flag != SUBDIR_PARSE) {
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+        free_Htaccess_list(&g_auth);
+#endif
+#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
+        free_Htaccess_list(&mime_a);
+#endif
+#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
+        free_Htaccess_list(&script_i);
+#endif
+    }
+#endif
+
+    if (flag == SUBDIR_PARSE || cf == NULL) {
+        cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
+        sprintf((char *)cf, "%s/%s", path, httpd_conf);
+    }
+
+    while ((f = fopen(cf, "r")) == NULL) {
+        if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
+            /* config file not found, no changes to config */
+            return;
+        }
+        if (configFile && flag == FIRST_PARSE) /* if -c option given */
+            bb_perror_msg_and_die("%s", cf);
+        flag = FIND_FROM_HTTPD_ROOT;
+        cf = httpd_conf;
+    }
+
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+    prev = g_auth;
+#endif
+    /* This could stand some work */
+    while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
+        c = NULL;
+        for (p = p0; *p0 != '\0' && *p0 != '#'; p0++) {
+            if (!isspace(*p0)) {
+                *p++ = *p0;
+                if (*p0 == ':' && c == NULL)
+                    c = p;
+            }
+        }
+        *p = '\0';
+
+        /* test for empty or strange line */
+        if (c == NULL || *c == '\0')
+            continue;
+        p0 = buf;
+        if (*p0 == 'd')
             *p0 = 'D';
-            pip->mask = 0;
-            }
-            pip->allow_deny = *p0;
-            if(*p0 == 'D') {
-            /* Deny:form_IP move top */
-            pip->next = config->ip_a_d;
-            config->ip_a_d = pip;
-            } else {
-            /* add to bottom A:form_IP config line */
-            Htaccess_IP *prev_IP = config->ip_a_d;
-
-            if(prev_IP == NULL) {
-                config->ip_a_d = pip;
-            } else {
-                while(prev_IP->next)
-                    prev_IP = prev_IP->next;
-                prev_IP->next = pip;
-            }
-            }
-        }
-        continue;
-    }
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-    if(*p0 == '/') {
-        /* make full path from httpd root / curent_path / config_line_path */
-        cf = flag == SUBDIR_PARSE ? path : "";
-        p0 = malloc(strlen(cf) + (c - buf) + 2 + strlen(c));
-        if(p0 == NULL)
-        continue;
-        c[-1] = 0;
-        sprintf(p0, "/%s%s", cf, buf);
-
-        /* another call bb_simplify_path */
-        cf = p = p0;
-
-        do {
-            if (*p == '/') {
-            if (*cf == '/') {    /* skip duplicate (or initial) slash */
-                continue;
-            } else if (*cf == '.') {
-                if (cf[1] == '/' || cf[1] == 0) { /* remove extra '.' */
+        if (*c == '*') {
+            if (*p0 == 'D') {
+                /* memorize deny all */
+                flg_deny_all = 1;
+            }
+            /* skip default other "word:*" config lines */
+            continue;
+        }
+
+        if (*p0 == 'a')
+            *p0 = 'A';
+        if (*p0 == 'A' || *p0 == 'D') {
+            /* storing current config IP line */
+            pip = xzalloc(sizeof(Htaccess_IP));
+            if (pip) {
+                if (scan_ip_mask(c, &(pip->ip), &(pip->mask))) {
+                    /* syntax IP{/mask} error detected, protect all */
+                    *p0 = 'D';
+                    pip->mask = 0;
+                }
+                pip->allow_deny = *p0;
+                if (*p0 == 'D') {
+                    /* Deny:from_IP move top */
+                    pip->next = ip_a_d;
+                    ip_a_d = pip;
+                } else {
+                    /* add to bottom A:form_IP config line */
+                    Htaccess_IP *prev_IP = ip_a_d;
+
+                    if (prev_IP == NULL) {
+                        ip_a_d = pip;
+                    } else {
+                        while (prev_IP->next)
+                            prev_IP = prev_IP->next;
+                        prev_IP->next = pip;
+                    }
+                }
+            }
+            continue;
+        }
+
+#if ENABLE_FEATURE_HTTPD_ERROR_PAGES
+        if (flag == FIRST_PARSE && *p0 == 'E') {
+            int i;
+            /* error status code */
+            int status = atoi(++p0);
+            /* c already points at the character following ':' in parse loop */
+            /* c = strchr(p0, ':'); c++; */
+            if (status < HTTP_CONTINUE) {
+                bb_error_msg("config error '%s' in '%s'", buf, cf);
                 continue;
-                } else if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == 0)) {
-                ++cf;
-                if (p > p0) {
-                    while (*--p != '/');    /* omit previous dir */
-                }
-                continue;
-                }
-            }
-            }
-            *++p = *cf;
-        } while (*++cf);
-
-        if ((p == p0) || (*p != '/')) {      /* not a trailing slash */
-        ++p;                             /* so keep last character */
-        }
-        *p = 0;
-        sprintf(p0, "%s:%s", p0, c);
-    }
-#endif
-
-#if defined(CONFIG_FEATURE_HTTPD_BASIC_AUTH) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES) || defined(CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR)
-    /* storing current config line */
-    cur = calloc(1, sizeof(Htaccess) + strlen(p0));
-    if(cur) {
-        cf = strcpy(cur->before_colon, p0);
-        c = strchr(cf, ':');
-        *c++ = 0;
-        cur->after_colon = c;
-#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
-        if(*cf == '.') {
-        /* config .mime line move top for overwrite previous */
-        cur->next = config->mime_a;
-        config->mime_a = cur;
-        continue;
-        }
-#endif
-#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
-        if(*cf == '*' && cf[1] == '.') {
-        /* config script interpreter line move top for overwrite previous */
-        cur->next = config->script_i;
-        config->script_i = cur;
-        continue;
-        }
-#endif
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-        free(p0);
-        if(prev == NULL) {
-        /* first line */
-        config->auth = prev = cur;
-        } else {
-        /* sort path, if current lenght eq or bigger then move up */
-        Htaccess *prev_hti = config->auth;
-        size_t l = strlen(cf);
-        Htaccess *hti;
-
-        for(hti = prev_hti; hti; hti = hti->next) {
-            if(l >= strlen(hti->before_colon)) {
-            /* insert before hti */
-            cur->next = hti;
-            if(prev_hti != hti) {
-                prev_hti->next = cur;
-            } else {
-                /* insert as top */
-                config->auth = cur;
-            }
-            break;
-            }
-            if(prev_hti != hti)
-                prev_hti = prev_hti->next;
-        }
-        if(!hti)  {       /* not inserted, add to bottom */
-            prev->next = cur;
-            prev = cur;
-        }
-        }
-#endif
-    }
-#endif
-   }
-   fclose(f);
-}
-
-#ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
-/****************************************************************************
- *
- > $Function: encodeString()
- *
- * $Description: Given a string, html encode special characters.
- *   This is used for the -e command line option to provide an easy way
- *   for scripts to encode result data without confusing browsers.  The
- *   returned string pointer is memory allocated by malloc().
- *
- * $Parameters:
- *      (const char *) string . . The first string to encode.
- *
- * $Return: (char *) . . . .. . . A pointer to the encoded string.
- *
- * $Errors: Returns a null string ("") if memory is not available.
- *
- ****************************************************************************/
-static char *encodeString(const char *string)
-{
-  /* take the simple route and encode everything */
-  /* could possibly scan once to get length.     */
-  int len = strlen(string);
-  char *out = malloc(len * 6 + 1);
-  char *p=out;
-  char ch;
-
-  if (!out) return "";
-  while ((ch = *string++)) {
-    // very simple check for what to encode
-    if (isalnum(ch)) *p++ = ch;
-    else p += sprintf(p, "&#%d;", (unsigned char) ch);
-  }
-  *p=0;
-  return out;
-}
-#endif          /* CONFIG_FEATURE_HTTPD_ENCODE_URL_STR */
-
-/****************************************************************************
- *
- > $Function: decodeString()
- *
- * $Description: Given a URL encoded string, convert it to plain ascii.
- *   Since decoding always makes strings smaller, the decode is done in-place.
- *   Thus, callers should strdup() the argument if they do not want the
- *   argument modified.  The return is the original pointer, allowing this
- *   function to be easily used as arguments to other functions.
- *
- * $Parameters:
- *      (char *) string . . . The first string to decode.
- *      (int)    flag   . . . 1 if require decode '+' as ' ' for CGI
- *
- * $Return: (char *)  . . . . A pointer to the decoded string (same as input).
- *
- * $Errors: None
- *
- ****************************************************************************/
-static char *decodeString(char *orig, int flag_plus_to_space)
-{
-  /* note that decoded string is always shorter than original */
-  char *string = orig;
-  char *ptr = string;
-
-  while (*ptr)
-  {
-    if (*ptr == '+' && flag_plus_to_space)    { *string++ = ' '; ptr++; }
-    else if (*ptr != '%') *string++ = *ptr++;
-    else  {
-      unsigned int value1, value2;
-
-      ptr++;
-      if(sscanf(ptr, "%1X", &value1) != 1 ||
-                sscanf(ptr+1, "%1X", &value2) != 1) {
-    if(!flag_plus_to_space)
-        return NULL;
-    *string++ = '%';
-      } else {
-    value1 = value1 * 16 + value2;
-    if(value1 == '/' || value1 == 0)
-        return orig+1;
-    *string++ = value1;
-    ptr += 2;
-      }
-    }
-  }
-  *string = '\0';
-  return orig;
-}
-
-
-#ifdef CONFIG_FEATURE_HTTPD_CGI
-/****************************************************************************
- *
- > $Function: addEnv()
- *
- * $Description: Add an environment variable setting to the global list.
- *    A NAME=VALUE string is allocated, filled, and added to the list of
- *    environment settings passed to the cgi execution script.
- *
- * $Parameters:
- *  (char *) name_before_underline - The first part environment variable name.
- *  (char *) name_after_underline  - The second part environment variable name.
- *  (char *) value  . . The value to which the env variable is set.
- *
- * $Return: (void)
- *
- * $Errors: Silently returns if the env runs out of space to hold the new item
- *
- ****************************************************************************/
-static void addEnv(const char *name_before_underline,
-            const char *name_after_underline, const char *value)
-{
-  char *s = NULL;
-  const char *underline;
-
-  if (!value)
-    value = "";
-  underline = *name_after_underline ? "_" : "";
-  asprintf(&s, "%s%s%s=%s", name_before_underline, underline,
-                    name_after_underline, value);
-  if(s) {
-    putenv(s);
-  }
-}
-
-#if defined(CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV) || defined(CONFIG_FEATURE_HTTPD_WITHOUT_INETD)
-/* set environs SERVER_PORT and REMOTE_PORT */
-static void addEnvPort(const char *port_name)
-{
-      char buf[16];
-
-      sprintf(buf, "%u", config->port);
-      addEnv(port_name, "PORT", buf);
-}
-#endif
-#endif          /* CONFIG_FEATURE_HTTPD_CGI */
-
-
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-/****************************************************************************
- *
- > $Function: decodeBase64()
- *
- > $Description: Decode a base 64 data stream as per rfc1521.
- *    Note that the rfc states that none base64 chars are to be ignored.
- *    Since the decode always results in a shorter size than the input, it is
- *    OK to pass the input arg as an output arg.
- *
- * $Parameter:
- *      (char *) Data . . . . A pointer to a base64 encoded string.
- *                            Where to place the decoded data.
- *
- * $Return: void
- *
- * $Errors: None
- *
- ****************************************************************************/
-static void decodeBase64(char *Data)
-{
-
-  const unsigned char *in = (const unsigned char *)Data;
-  // The decoded size will be at most 3/4 the size of the encoded
-  unsigned long ch = 0;
-  int i = 0;
-
-  while (*in) {
-    int t = *in++;
-
-    if(t >= '0' && t <= '9')
-    t = t - '0' + 52;
-    else if(t >= 'A' && t <= 'Z')
-    t = t - 'A';
-    else if(t >= 'a' && t <= 'z')
-    t = t - 'a' + 26;
-    else if(t == '+')
-    t = 62;
-    else if(t == '/')
-    t = 63;
-    else if(t == '=')
-    t = 0;
-    else
-    continue;
-
-    ch = (ch << 6) | t;
-    i++;
-    if (i == 4) {
-    *Data++ = (char) (ch >> 16);
-    *Data++ = (char) (ch >> 8);
-    *Data++ = (char) ch;
-    i = 0;
-    }
-  }
-  *Data = 0;
-}
-#endif
-
-
-#ifdef CONFIG_FEATURE_HTTPD_WITHOUT_INETD
-/****************************************************************************
- *
- > $Function: openServer()
- *
- * $Description: create a listen server socket on the designated port.
- *
- * $Return: (int)  . . . A connection socket. -1 for errors.
- *
- * $Errors: None
- *
- ****************************************************************************/
-static int openServer(void)
-{
-  struct sockaddr_in lsocket;
-  int fd;
-  int on = 1;
-
-  /* create the socket right now */
-  /* inet_addr() returns a value that is already in network order */
-  memset(&lsocket, 0, sizeof(lsocket));
-  lsocket.sin_family = AF_INET;
-  lsocket.sin_addr.s_addr = INADDR_ANY;
-  lsocket.sin_port = htons(config->port);
-  fd = bb_xsocket(AF_INET, SOCK_STREAM, 0);
-  /* tell the OS it's OK to reuse a previous address even though */
-  /* it may still be in a close down state.  Allows bind to succeed. */
-#ifdef SO_REUSEPORT
-  setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (void *)&on, sizeof(on)) ;
-#else
-  setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)) ;
-#endif
-  bb_xbind(fd, (struct sockaddr *)&lsocket, sizeof(lsocket));
-  listen(fd, 9); /* bb_xlisten? */
-  signal(SIGCHLD, SIG_IGN);   /* prevent zombie (defunct) processes */
-  return fd;
-}
-#endif  /* CONFIG_FEATURE_HTTPD_WITHOUT_INETD */
-
-/****************************************************************************
- *
- > $Function: sendHeaders()
- *
- * $Description: Create and send HTTP response headers.
- *   The arguments are combined and sent as one write operation.  Note that
- *   IE will puke big-time if the headers are not sent in one packet and the
- *   second packet is delayed for any reason.
- *
- * $Parameter:
- *      (HttpResponseNum) responseNum . . . The result code to send.
- *
- * $Return: (int)  . . . . writing errors
- *
- ****************************************************************************/
-static int sendHeaders(HttpResponseNum responseNum)
-{
-  char *buf = config->buf;
-  const char *responseString = "";
-  const char *infoString = 0;
-  const char *mime_type;
-  unsigned int i;
-  time_t timer = time(0);
-  char timeStr[80];
-  int len;
-
-  for (i = 0;
-    i < (sizeof(httpResponseNames)/sizeof(httpResponseNames[0])); i++) {
-        if (httpResponseNames[i].type == responseNum) {
-            responseString = httpResponseNames[i].name;
-            infoString = httpResponseNames[i].info;
-            break;
-        }
-  }
-  /* error message is HTML */
-  mime_type = responseNum == HTTP_OK ?
-        config->httpd_found.found_mime_type : "text/html";
-
-  /* emit the current date */
-  strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&timer));
-  len = sprintf(buf,
-    "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
-    "Date: %s\r\nConnection: close\r\n",
-      responseNum, responseString, mime_type, timeStr);
-
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-  if (responseNum == HTTP_UNAUTHORIZED) {
-    len += sprintf(buf+len, "WWW-Authenticate: Basic realm=\"%s\"\r\n",
-                                config->realm);
-  }
-#endif
-  if(responseNum == HTTP_MOVED_TEMPORARILY) {
-    len += sprintf(buf+len, "Location: %s/%s%s\r\n",
-        config->httpd_found.found_moved_temporarily,
-        (config->query ? "?" : ""),
-        (config->query ? config->query : ""));
-  }
-
-  if (config->ContentLength != -1) {    /* file */
-    strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&config->last_mod));
-    len += sprintf(buf+len, "Last-Modified: %s\r\n%s " cont_l_fmt "\r\n",
-                  timeStr, Content_length, cont_l_type config->ContentLength);
-  }
-  strcat(buf, "\r\n");
-  len += 2;
-  if (infoString) {
-    len += sprintf(buf+len,
-        "<HEAD><TITLE>%d %s</TITLE></HEAD>\n"
-        "<BODY><H1>%d %s</H1>\n%s\n</BODY>\n",
-        responseNum, responseString,
-        responseNum, responseString, infoString);
-  }
-#if DEBUG
-  fprintf(stderr, "Headers: '%s'", buf);
-#endif
-  return bb_full_write(a_c_w, buf, len);
-}
-
-/****************************************************************************
- *
- > $Function: getLine()
- *
- * $Description: Read from the socket until an end of line char found.
- *
- *   Characters are read one at a time until an eol sequence is found.
- *
- * $Return: (int) . . . . number of characters read.  -1 if error.
- *
- ****************************************************************************/
-static int getLine(void)
-{
-  int  count = 0;
-  char *buf = config->buf;
-
-  while (read(a_c_r, buf + count, 1) == 1) {
-    if (buf[count] == '\r') continue;
-    if (buf[count] == '\n') {
-      buf[count] = 0;
-      return count;
-    }
-    if(count < (MAX_MEMORY_BUFF-1))      /* check owerflow */
-    count++;
-  }
-  if (count) return count;
-  else return -1;
-}
-
-#ifdef CONFIG_FEATURE_HTTPD_CGI
-/****************************************************************************
- *
- > $Function: sendCgi()
- *
- * $Description: Execute a CGI script and send it's stdout back
- *
- *   Environment variables are set up and the script is invoked with pipes
- *   for stdin/stdout.  If a post is being done the script is fed the POST
- *   data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
- *
- * $Parameters:
- *      (const char *) url . . . . . . The requested URL (with leading /).
- *      (int bodyLen)  . . . . . . . . Length of the post body.
- *      (const char *cookie) . . . . . For set HTTP_COOKIE.
- *      (const char *content_type) . . For set CONTENT_TYPE.
-
- *
- * $Return: (char *)  . . . . A pointer to the decoded string (same as input).
- *
- * $Errors: None
- *
- ****************************************************************************/
-static int sendCgi(const char *url,
-           const char *request, int bodyLen, const char *cookie,
-           const char *content_type)
-{
-  int fromCgi[2];  /* pipe for reading data from CGI */
-  int toCgi[2];    /* pipe for sending data to CGI */
-
-  static char * argp[] = { 0, 0 };
-  int pid = 0;
-  int inFd;
-  int outFd;
-  int firstLine = 1;
-
-  do {
-    if (pipe(fromCgi) != 0) {
-      break;
-    }
-    if (pipe(toCgi) != 0) {
-      break;
-    }
-
-    pid = fork();
-    if (pid < 0) {
-    pid = 0;
-    break;
-    }
-
-    if (!pid) {
-      /* child process */
-      char *script;
-      char *purl = strdup( url );
-      char realpath_buff[MAXPATHLEN];
-
-      if(purl == NULL)
-    _exit(242);
-
-      inFd  = toCgi[0];
-      outFd = fromCgi[1];
-
-      dup2(inFd, 0);  // replace stdin with the pipe
-      dup2(outFd, 1);  // replace stdout with the pipe
-      if(!DEBUG)
-    dup2(outFd, 2);  // replace stderr with the pipe
-
-      close(toCgi[0]);
-      close(toCgi[1]);
-      close(fromCgi[0]);
-      close(fromCgi[1]);
-
-      /*
-       * Find PATH_INFO.
-       */
-      script = purl;
-      while((script = strchr( script + 1, '/' )) != NULL) {
-    /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
-    struct stat sb;
-
-    *script = '\0';
-    if(is_directory(purl + 1, 1, &sb) == 0) {
-        /* not directory, found script.cgi/PATH_INFO */
-        *script = '/';
-        break;
-    }
-    *script = '/';          /* is directory, find next '/' */
-      }
-      addEnv("PATH", "INFO", script);   /* set /PATH_INFO or NULL */
-      addEnv("PATH",           "",         getenv("PATH"));
-      addEnv("REQUEST",        "METHOD",   request);
-      if(config->query) {
-    char *uri = alloca(strlen(purl) + 2 + strlen(config->query));
-    if(uri)
-        sprintf(uri, "%s?%s", purl, config->query);
-    addEnv("REQUEST",        "URI",   uri);
-      } else {
-    addEnv("REQUEST",        "URI",   purl);
-      }
-      if(script != NULL)
-    *script = '\0';         /* reduce /PATH_INFO */
-       /* SCRIPT_FILENAME required by PHP in CGI mode */
-       if(realpath(purl + 1, realpath_buff))
-     addEnv("SCRIPT", "FILENAME", realpath_buff);
-       else
-     *realpath_buff = 0;
-      /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
-      addEnv("SCRIPT_NAME",    "",         purl);
-      addEnv("QUERY_STRING",   "",         config->query);
-      addEnv("SERVER",         "SOFTWARE", httpdVersion);
-      addEnv("SERVER",         "PROTOCOL", "HTTP/1.0");
-      addEnv("GATEWAY_INTERFACE", "",      "CGI/1.1");
-      addEnv("REMOTE",         "ADDR",     config->rmt_ip_str);
-#ifdef CONFIG_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
-      addEnvPort("REMOTE");
-#endif
-      if(bodyLen) {
-    char sbl[32];
-
-    sprintf(sbl, "%d", bodyLen);
-    addEnv("CONTENT", "LENGTH", sbl);
-      }
-      if(cookie)
-    addEnv("HTTP", "COOKIE", cookie);
-      if(content_type)
-    addEnv("CONTENT", "TYPE", content_type);
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-      if(config->remoteuser) {
-    addEnv("REMOTE", "USER", config->remoteuser);
-    addEnv("AUTH_TYPE", "", "Basic");
-      }
-#endif
-      if(config->referer)
-    addEnv("HTTP", "REFERER", config->referer);
-
-    /* set execve argp[0] without path */
-      argp[0] = strrchr( purl, '/' ) + 1;
-    /* but script argp[0] must have absolute path and chdiring to this */
-      if(*realpath_buff) {
-        script = strrchr(realpath_buff, '/');
-        if(script) {
-        *script = '\0';
-        if(chdir(realpath_buff) == 0) {
-          // now run the program.  If it fails,
-          // use _exit() so no destructors
-          // get called and make a mess.
-#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
-          char *interpr = NULL;
-          char *suffix = strrchr(purl, '.');
-
-          if(suffix) {
-            Htaccess * cur;
-            for (cur = config->script_i; cur; cur = cur->next)
-                if(strcmp(cur->before_colon + 1, suffix) == 0) {
-                    interpr = cur->after_colon;
+            }
+
+            /* then error page; find matching status */
+            for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
+                if (http_response_type[i] == status) {
+                    http_error_page[i] = concat_path_file((*c == '/') ? NULL : home_httpd, c);
                     break;
                 }
-          }
-#endif
-          *script = '/';
-#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
-          if (interpr)
-            execv(interpr, argp);
-          else
-#endif
-            execv(realpath_buff, argp);
-        }
-        }
-      }
-#ifdef CONFIG_FEATURE_HTTPD_WITHOUT_INETD
-      config->accepted_socket = 1;      /* send to stdout */
-#endif
-      sendHeaders(HTTP_NOT_FOUND);
-      _exit(242);
-    } /* end child */
-
-  } while (0);
-
-  if (pid) {
-    /* parent process */
-    int status;
-    size_t post_readed_size = 0, post_readed_idx = 0;
-
-    inFd  = fromCgi[0];
-    outFd = toCgi[1];
-    close(fromCgi[1]);
-    close(toCgi[0]);
-    signal(SIGPIPE, SIG_IGN);
-
-    while (1) {
-      fd_set readSet;
-      fd_set writeSet;
-      char wbuf[128];
-      int nfound;
-      int count;
-
-      FD_ZERO(&readSet);
-      FD_ZERO(&writeSet);
-      FD_SET(inFd, &readSet);
-      if(bodyLen > 0 || post_readed_size > 0) {
-    FD_SET(outFd, &writeSet);
-    nfound = outFd > inFd ? outFd : inFd;
-    if(post_readed_size == 0) {
-        FD_SET(a_c_r, &readSet);
-        if(nfound < a_c_r)
-            nfound = a_c_r;
-    }
-      /* Now wait on the set of sockets! */
-    nfound = select(nfound + 1, &readSet, &writeSet, 0, NULL);
-      } else {
-    if(!bodyLen) {
-        close(outFd);
-        bodyLen = -1;
-    }
-    nfound = select(inFd + 1, &readSet, 0, 0, NULL);
-      }
-
-      if (nfound <= 0) {
-    if (waitpid(pid, &status, WNOHANG) > 0) {
-      close(inFd);
+            }
+            continue;
+        }
+#endif
+
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+        if (*p0 == '/') {
+            /* make full path from httpd root / current_path / config_line_path */
+            cf = (flag == SUBDIR_PARSE ? path : "");
+            p0 = xmalloc(strlen(cf) + (c - buf) + 2 + strlen(c));
+            c[-1] = '\0';
+            sprintf(p0, "/%s%s", cf, buf);
+
+            /* another call bb_simplify_path */
+            cf = p = p0;
+
+            do {
+                if (*p == '/') {
+                    if (*cf == '/') {    /* skip duplicate (or initial) slash */
+                        continue;
+                    } else if (*cf == '.') {
+                        if (cf[1] == '/' || cf[1] == '\0') { /* remove extra '.' */
+                            continue;
+                        } else if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == '\0')) {
+                            ++cf;
+                            if (p > p0) {
+                                while (*--p != '/') /* omit previous dir */;
+                            }
+                            continue;
+                        }
+                    }
+                }
+                *++p = *cf;
+            } while (*++cf);
+
+            if ((p == p0) || (*p != '/')) {      /* not a trailing slash */
+                ++p;                             /* so keep last character */
+            }
+            *p = '\0';
+            sprintf(p0 + strlen(p0), ":%s", c);
+        }
+#endif
+
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
+ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
+ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
+        /* storing current config line */
+        cur = xzalloc(sizeof(Htaccess) + strlen(p0));
+        if (cur) {
+            cf = strcpy(cur->before_colon, p0);
+            c = strchr(cf, ':');
+            *c++ = 0;
+            cur->after_colon = c;
+#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
+            if (*cf == '.') {
+                /* config .mime line move top for overwrite previous */
+                cur->next = mime_a;
+                mime_a = cur;
+                continue;
+            }
+#endif
+#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
+            if (*cf == '*' && cf[1] == '.') {
+                /* config script interpreter line move top for overwrite previous */
+                cur->next = script_i;
+                script_i = cur;
+                continue;
+            }
+#endif
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+            free(p0);
+            if (prev == NULL) {
+                /* first line */
+                g_auth = prev = cur;
+            } else {
+                /* sort path, if current lenght eq or bigger then move up */
+                Htaccess *prev_hti = g_auth;
+                size_t l = strlen(cf);
+                Htaccess *hti;
+
+                for (hti = prev_hti; hti; hti = hti->next) {
+                    if (l >= strlen(hti->before_colon)) {
+                        /* insert before hti */
+                        cur->next = hti;
+                        if (prev_hti != hti) {
+                            prev_hti->next = cur;
+                        } else {
+                            /* insert as top */
+                            g_auth = cur;
+                        }
+                        break;
+                    }
+                    if (prev_hti != hti)
+                        prev_hti = prev_hti->next;
+                }
+                if (!hti) {       /* not inserted, add to bottom */
+                    prev->next = cur;
+                    prev = cur;
+                }
+            }
+#endif
+        }
+#endif
+     }
+     fclose(f);
+}
+
+#if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
+/*
+ * Given a string, html-encode special characters.
+ * This is used for the -e command line option to provide an easy way
+ * for scripts to encode result data without confusing browsers.  The
+ * returned string pointer is memory allocated by malloc().
+ *
+ * Returns a pointer to the encoded string (malloced).
+ */
+static char *encodeString(const char *string)
+{
+    /* take the simple route and encode everything */
+    /* could possibly scan once to get length.     */
+    int len = strlen(string);
+    char *out = xmalloc(len * 6 + 1);
+    char *p = out;
+    char ch;
+
+    while ((ch = *string++)) {
+        /* very simple check for what to encode */
+        if (isalnum(ch))
+            *p++ = ch;
+        else
+            p += sprintf(p, "&#%d;", (unsigned char) ch);
+    }
+    *p = '\0';
+    return out;
+}
+#endif          /* FEATURE_HTTPD_ENCODE_URL_STR */
+
+/*
+ * Given a URL encoded string, convert it to plain ascii.
+ * Since decoding always makes strings smaller, the decode is done in-place.
+ * Thus, callers should strdup() the argument if they do not want the
+ * argument modified.  The return is the original pointer, allowing this
+ * function to be easily used as arguments to other functions.
+ *
+ * string    The first string to decode.
+ * option_d  1 if called for httpd -d
+ *
+ * Returns a pointer to the decoded string (same as input).
+ */
+static unsigned hex_to_bin(unsigned char c)
+{
+    unsigned v;
+
+    v = c - '0';
+    if (v <= 9)
+        return v;
+    /* c | 0x20: letters to lower case, non-letters
+     * to (potentially different) non-letters */
+    v = (unsigned)(c | 0x20) - 'a';
+    if (v <= 5)
+        return v + 10;
+    return ~0;
+}
+/* For testing:
+void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
+int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
+t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
+*/
+static char *decodeString(char *orig, int option_d)
+{
+    /* note that decoded string is always shorter than original */
+    char *string = orig;
+    char *ptr = string;
+    char c;
+
+    while ((c = *ptr++) != '\0') {
+        unsigned v;
+
+        if (option_d && c == '+') {
+            *string++ = ' ';
+            continue;
+        }
+        if (c != '%') {
+            *string++ = c;
+            continue;
+        }
+        v = hex_to_bin(ptr[0]);
+        if (v > 15) {
+ bad_hex:
+            if (!option_d)
+                return NULL;
+            *string++ = '%';
+            continue;
+        }
+        v = (v * 16) | hex_to_bin(ptr[1]);
+        if (v > 255)
+            goto bad_hex;
+        if (!option_d && (v == '/' || v == '\0')) {
+            /* caller takes it as indication of invalid
+             * (dangerous wrt exploits) chars */
+            return orig + 1;
+        }
+        *string++ = v;
+        ptr += 2;
+    }
+    *string = '\0';
+    return orig;
+}
+
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+/*
+ * Decode a base64 data stream as per rfc1521.
+ * Note that the rfc states that non base64 chars are to be ignored.
+ * Since the decode always results in a shorter size than the input,
+ * it is OK to pass the input arg as an output arg.
+ * Parameter: a pointer to a base64 encoded string.
+ * Decoded data is stored in-place.
+ */
+static void decodeBase64(char *Data)
+{
+    const unsigned char *in = (const unsigned char *)Data;
+    /* The decoded size will be at most 3/4 the size of the encoded */
+    unsigned ch = 0;
+    int i = 0;
+
+    while (*in) {
+        int t = *in++;
+
+        if (t >= '0' && t <= '9')
+            t = t - '0' + 52;
+        else if (t >= 'A' && t <= 'Z')
+            t = t - 'A';
+        else if (t >= 'a' && t <= 'z')
+            t = t - 'a' + 26;
+        else if (t == '+')
+            t = 62;
+        else if (t == '/')
+            t = 63;
+        else if (t == '=')
+            t = 0;
+        else
+            continue;
+
+        ch = (ch << 6) | t;
+        i++;
+        if (i == 4) {
+            *Data++ = (char) (ch >> 16);
+            *Data++ = (char) (ch >> 8);
+            *Data++ = (char) ch;
+            i = 0;
+        }
+    }
+    *Data = '\0';
+}
+#endif
+
+/*
+ * Create a listen server socket on the designated port.
+ */
+static int openServer(void)
+{
+    int n = bb_strtou(bind_addr_or_port, NULL, 10);
+    if (!errno && n && n <= 0xffff)
+        n = create_and_bind_stream_or_die(NULL, n);
+    else
+        n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
+    xlisten(n, 9);
+    return n;
+}
+
+/*
+ * Log the connection closure and exit.
+ */
+static void log_and_exit(void) ATTRIBUTE_NORETURN;
+static void log_and_exit(void)
+{
+    /* Paranoia. IE said to be buggy. It may send some extra data
+     * or be confused by us just exiting without SHUT_WR. Oh well. */
+    shutdown(1, SHUT_WR);
+    ndelay_on(0);
+    while (read(0, iobuf, IOBUF_SIZE) > 0)
+        continue;
+
+    if (verbose > 2)
+        bb_error_msg("closed");
+    _exit(xfunc_error_retval);
+}
+
+/*
+ * Create and send HTTP response headers.
+ * The arguments are combined and sent as one write operation.  Note that
+ * IE will puke big-time if the headers are not sent in one packet and the
+ * second packet is delayed for any reason.
+ * responseNum - the result code to send.
+ */
+static void send_headers(int responseNum)
+{
+    static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
+
+    const char *responseString = "";
+    const char *infoString = NULL;
+    const char *mime_type;
+#if ENABLE_FEATURE_HTTPD_ERROR_PAGES
+    const char *error_page = 0;
+#endif
+    unsigned i;
+    time_t timer = time(0);
+    char tmp_str[80];
+    int len;
+
+    for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
+        if (http_response_type[i] == responseNum) {
+            responseString = http_response[i].name;
+            infoString = http_response[i].info;
+#if ENABLE_FEATURE_HTTPD_ERROR_PAGES
+            error_page = http_error_page[i];
+#endif
+            break;
+        }
+    }
+    /* error message is HTML */
+    mime_type = responseNum == HTTP_OK ?
+                found_mime_type : "text/html";
+
+    if (verbose)
+        bb_error_msg("response:%u", responseNum);
+
+    /* emit the current date */
+    strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
+    len = sprintf(iobuf,
+            "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
+            "Date: %s\r\nConnection: close\r\n",
+            responseNum, responseString, mime_type, tmp_str);
+
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+    if (responseNum == HTTP_UNAUTHORIZED) {
+        len += sprintf(iobuf + len,
+                "WWW-Authenticate: Basic realm=\"%s\"\r\n",
+                g_realm);
+    }
+#endif
+    if (responseNum == HTTP_MOVED_TEMPORARILY) {
+        len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
+                found_moved_temporarily,
+                (g_query ? "?" : ""),
+                (g_query ? g_query : ""));
+    }
+
+#if ENABLE_FEATURE_HTTPD_ERROR_PAGES
+    if (error_page && !access(error_page, R_OK)) {
+        strcat(iobuf, "\r\n");
+        len += 2;
+
+        if (DEBUG)
+            fprintf(stderr, "headers: '%s'\n", iobuf);
+        full_write(1, iobuf, len);
+        if (DEBUG)
+            fprintf(stderr, "writing error page: '%s'\n", error_page);
+        return send_file_and_exit(error_page, FALSE);
+    }
+#endif
+
+    if (ContentLength != -1) {    /* file */
+        strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
+        len += sprintf(iobuf + len, "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
+            tmp_str, "Content-length:", ContentLength);
+    }
+    iobuf[len++] = '\r';
+    iobuf[len++] = '\n';
+    if (infoString) {
+        len += sprintf(iobuf + len,
+                "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
+                "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
+                responseNum, responseString,
+                responseNum, responseString, infoString);
+    }
+    if (DEBUG)
+        fprintf(stderr, "headers: '%s'\n", iobuf);
+    if (full_write(1, iobuf, len) != len) {
+        if (verbose > 1)
+            bb_perror_msg("error");
+        log_and_exit();
+    }
+}
+
+static void send_headers_and_exit(int responseNum) ATTRIBUTE_NORETURN;
+static void send_headers_and_exit(int responseNum)
+{
+    send_headers(responseNum);
+    log_and_exit();
+}
+
+/*
+ * Read from the socket until '\n' or EOF. '\r' chars are removed.
+ * '\n' is replaced with NUL.
+ * Return number of characters read or 0 if nothing is read
+ * ('\r' and '\n' are not counted).
+ * Data is returned in iobuf.
+ */
+static int get_line(void)
+{
+    int count = 0;
+    char c;
+
+    while (1) {
+        if (hdr_cnt <= 0) {
+            hdr_cnt = safe_read(0, hdr_buf, sizeof(hdr_buf));
+            if (hdr_cnt <= 0)
+                break;
+            hdr_ptr = hdr_buf;
+        }
+        iobuf[count] = c = *hdr_ptr++;
+        hdr_cnt--;
+
+        if (c == '\r')
+            continue;
+        if (c == '\n') {
+            iobuf[count] = '\0';
+            return count;
+        }
+        if (count < (IOBUF_SIZE - 1))      /* check overflow */
+            count++;
+    }
+    return count;
+}
+
+#if ENABLE_FEATURE_HTTPD_CGI
+static void setenv1(const char *name, const char *value)
+{
+    setenv(name, value ? value : "", 1);
+}
+
+/*
+ * Spawn CGI script, forward CGI's stdin/out <=> network
+ *
+ * Environment variables are set up and the script is invoked with pipes
+ * for stdin/stdout.  If a post is being done the script is fed the POST
+ * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
+ *
+ * Parameters:
+ * const char *url              The requested URL (with leading /).
+ * int bodyLen                  Length of the post body.
+ * const char *cookie           For set HTTP_COOKIE.
+ * const char *content_type     For set CONTENT_TYPE.
+ */
+static void send_cgi_and_exit(
+        const char *url,
+        const char *request,
+        int bodyLen,
+        const char *cookie,
+        const char *content_type) ATTRIBUTE_NORETURN;
+static void send_cgi_and_exit(
+        const char *url,
+        const char *request,
+        int bodyLen,
+        const char *cookie,
+        const char *content_type)
+{
+    struct { int rd; int wr; } fromCgi;  /* CGI -> httpd pipe */
+    struct { int rd; int wr; } toCgi;    /* httpd -> CGI pipe */
+    char *fullpath;
+    char *script;
+    char *purl;
+    int buf_count;
+    int status;
+    int pid = 0;
+
+    /*
+     * We are mucking with environment _first_ and then vfork/exec,
+     * this allows us to use vfork safely. Parent don't care about
+     * these environment changes anyway.
+     */
+
+    /*
+     * Find PATH_INFO.
+     */
+    purl = xstrdup(url);
+    script = purl;
+    while ((script = strchr(script + 1, '/')) != NULL) {
+        /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
+        struct stat sb;
+
+        *script = '\0';
+        if (!is_directory(purl + 1, 1, &sb)) {
+            /* not directory, found script.cgi/PATH_INFO */
+            *script = '/';
+            break;
+        }
+        *script = '/';          /* is directory, find next '/' */
+    }
+    setenv1("PATH_INFO", script);   /* set /PATH_INFO or "" */
+    setenv1("REQUEST_METHOD", request);
+    if (g_query) {
+        putenv(xasprintf("%s=%s?%s", "REQUEST_URI", purl, g_query));
+    } else {
+        setenv1("REQUEST_URI", purl);
+    }
+    if (script != NULL)
+        *script = '\0';         /* cut off /PATH_INFO */
+
+    /* SCRIPT_FILENAME required by PHP in CGI mode */
+    fullpath = concat_path_file(home_httpd, purl);
+    setenv1("SCRIPT_FILENAME", fullpath);
+    /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
+    setenv1("SCRIPT_NAME", purl);
+    /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
+     * QUERY_STRING: The information which follows the ? in the URL
+     * which referenced this script. This is the query information.
+     * It should not be decoded in any fashion. This variable
+     * should always be set when there is query information,
+     * regardless of command line decoding. */
+    /* (Older versions of bbox seem to do some decoding) */
+    setenv1("QUERY_STRING", g_query);
+    putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
+    putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
+    putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
+    /* Having _separate_ variables for IP and port defeats
+     * the purpose of having socket abstraction. Which "port"
+     * are you using on Unix domain socket?
+     * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
+     * Oh well... */
+    {
+        char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
+        char *cp = strrchr(p, ':');
+        if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
+            cp = NULL;
+        if (cp) *cp = '\0'; /* delete :PORT */
+        setenv1("REMOTE_ADDR", p);
+        if (cp) {
+            *cp = ':';
+#if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
+            setenv1("REMOTE_PORT", cp + 1);
+#endif
+        }
+    }
+    setenv1("HTTP_USER_AGENT", user_agent);
+    if (bodyLen)
+        putenv(xasprintf("CONTENT_LENGTH=%d", bodyLen));
+    if (cookie)
+        setenv1("HTTP_COOKIE", cookie);
+    if (content_type)
+        setenv1("CONTENT_TYPE", content_type);
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+    if (remoteuser) {
+        setenv1("REMOTE_USER", remoteuser);
+        putenv((char*)"AUTH_TYPE=Basic");
+    }
+#endif
+    if (referer)
+        setenv1("HTTP_REFERER", referer);
+
+    xpipe(&fromCgi.rd);
+    xpipe(&toCgi.rd);
+
+    pid = vfork();
+    if (pid < 0) {
+        /* TODO: log perror? */
+        log_and_exit();
+    }
+
+    if (!pid) {
+        /* Child process */
+        xfunc_error_retval = 242;
+
+        xmove_fd(toCgi.rd, 0);  /* replace stdin with the pipe */
+        xmove_fd(fromCgi.wr, 1);  /* replace stdout with the pipe */
+        close(fromCgi.rd);
+        close(toCgi.wr);
+        /* User seeing stderr output can be a security problem.
+         * If CGI really wants that, it can always do dup itself. */
+        /* dup2(1, 2); */
+
+        /* script must have absolute path */
+        script = strrchr(fullpath, '/');
+        if (!script)
+            goto error_execing_cgi;
+        *script = '\0';
+        /* chdiring to script's dir */
+        if (chdir(fullpath) == 0) {
+            char *argv[2];
+#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
+            char *interpr = NULL;
+            char *suffix = strrchr(purl, '.');
+
+            if (suffix) {
+                Htaccess *cur;
+                for (cur = script_i; cur; cur = cur->next) {
+                    if (strcmp(cur->before_colon + 1, suffix) == 0) {
+                        interpr = cur->after_colon;
+                        break;
+                    }
+                }
+            }
+#endif
+            *script = '/';
+            /* set argv[0] to name without path */
+            argv[0] = (char*)bb_basename(purl);
+            argv[1] = NULL;
+#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
+            if (interpr)
+                execv(interpr, argv);
+            else
+#endif
+                execv(fullpath, argv);
+        }
+ error_execing_cgi:
+        /* send to stdout
+         * (we are CGI here, our stdout is pumped to the net) */
+        send_headers_and_exit(HTTP_NOT_FOUND);
+    } /* end child */
+
+    /* Parent process */
+
+    /* First, restore variables possibly changed by child */
+    xfunc_error_retval = 0;
+
+    /* Prepare for pumping data.
+     * iobuf is used for CGI -> network data,
+     * hdr_buf is for network -> CGI data (POSTDATA) */
+    buf_count = 0;
+    close(fromCgi.wr);
+    close(toCgi.rd);
+
+    /* If CGI dies, we still want to correctly finish reading its output
+     * and send it to the peer. So please no SIGPIPEs! */
+    signal(SIGPIPE, SIG_IGN);
+
+    /* This loop still looks messy. What is an exit criteria?
+     * "CGI's output closed"? Or "CGI has exited"?
+     * What to do if CGI has closed both input and output, but
+     * didn't exit? etc... */
+
+    /* NB: breaking out of this loop jumps to log_and_exit() */
+    while (1) {
+        fd_set readSet;
+        fd_set writeSet;
+        int nfound;
+        int count;
+
+        FD_ZERO(&readSet);
+        FD_ZERO(&writeSet);
+        FD_SET(fromCgi.rd, &readSet);
+        if (bodyLen > 0 || hdr_cnt > 0) {
+            FD_SET(toCgi.wr, &writeSet);
+            nfound = toCgi.wr > fromCgi.rd ? toCgi.wr : fromCgi.rd;
+            if (hdr_cnt <= 0)
+                FD_SET(0, &readSet);
+            /* Now wait on the set of sockets! */
+            nfound = select(nfound + 1, &readSet, &writeSet, NULL, NULL);
+        } else {
+            if (!bodyLen) {
+                close(toCgi.wr); /* no more POST data to CGI */
+                bodyLen = -1;
+            }
+            nfound = select(fromCgi.rd + 1, &readSet, NULL, NULL, NULL);
+        }
+
+        if (nfound <= 0) {
+            if (waitpid(pid, &status, WNOHANG) <= 0) {
+                /* Weird. CGI didn't exit and no fd's
+                 * are ready, yet select returned?! */
+                continue;
+            }
+            close(fromCgi.rd);
+            if (DEBUG && WIFEXITED(status))
+                bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
+            if (DEBUG && WIFSIGNALED(status))
+                bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
+            break;
+        }
+
+        if (hdr_cnt > 0 && FD_ISSET(toCgi.wr, &writeSet)) {
+            /* Have data from peer and can write to CGI */
+            count = safe_write(toCgi.wr, hdr_ptr, hdr_cnt);
+            /* Doesn't happen, we dont use nonblocking IO here
+             *if (count < 0 && errno == EAGAIN) {
+             *  ...
+             *} else */
+            if (count > 0) {
+                hdr_ptr += count;
+                hdr_cnt -= count;
+            } else {
+                hdr_cnt = bodyLen = 0; /* EOF/broken pipe to CGI */
+            }
+        } else if (bodyLen > 0 && hdr_cnt == 0
+         && FD_ISSET(0, &readSet)
+        ) {
+            /* We expect data, prev data portion is eaten by CGI
+             * and there *is* data to read from the peer
+             * (POSTDATA?) */
+            count = bodyLen > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : bodyLen;
+            count = safe_read(0, hdr_buf, count);
+            if (count > 0) {
+                hdr_cnt = count;
+                hdr_ptr = hdr_buf;
+                bodyLen -= count;
+            } else {
+                bodyLen = 0; /* closed */
+            }
+        }
+
+#define PIPESIZE PIPE_BUF
+#if PIPESIZE >= IOBUF_SIZE
+# error "PIPESIZE >= IOBUF_SIZE"
+#endif
+        if (FD_ISSET(fromCgi.rd, &readSet)) {
+            /* There is something to read from CGI */
+            char *rbuf = iobuf;
+
+            /* Are we still buffering CGI output? */
+            if (buf_count >= 0) {
+                /* HTTP_200[] has single "\r\n" at the end.
+                 * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
+                 * CGI scripts MUST send their own header terminated by
+                 * empty line, then data. That's why we have only one
+                 * <cr><lf> pair here. We will output "200 OK" line
+                 * if needed, but CGI still has to provide blank line
+                 * between header and body */
+
+                /* Must use safe_read, not full_read, because
+                 * CGI may output a few first bytes and then wait
+                 * for POSTDATA without closing stdout.
+                 * With full_read we may wait here forever. */
+                count = safe_read(fromCgi.rd, rbuf + buf_count, PIPESIZE - 8);
+                if (count <= 0) {
+                    /* eof (or error) and there was no "HTTP",
+                     * so write it, then write received data */
+                    if (buf_count) {
+                        full_write(1, HTTP_200, sizeof(HTTP_200)-1);
+                        full_write(1, rbuf, buf_count);
+                    }
+                    break; /* CGI stdout is closed, exiting */
+                }
+                buf_count += count;
+                count = 0;
+                /* "Status" header format is: "Status: 302 Redirected\r\n" */
+                if (buf_count >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
+                    /* send "HTTP/1.0 " */
+                    if (full_write(1, HTTP_200, 9) != 9)
+                        break;
+                    rbuf += 8; /* skip "Status: " */
+                    count = buf_count - 8;
+                    buf_count = -1; /* buffering off */
+                } else if (buf_count >= 4) {
+                    /* Did CGI add "HTTP"? */
+                    if (memcmp(rbuf, HTTP_200, 4) != 0) {
+                        /* there is no "HTTP", do it ourself */
+                        if (full_write(1, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
+                            break;
+                    }
+                    /* Commented out:
+                    if (!strstr(rbuf, "ontent-")) {
+                        full_write(s, "Content-type: text/plain\r\n\r\n", 28);
+                    }
+                     * Counter-example of valid CGI without Content-type:
+                     * echo -en "HTTP/1.0 302 Found\r\n"
+                     * echo -en "Location: http://www.busybox.net\r\n"
+                     * echo -en "\r\n"
+                     */
+                    count = buf_count;
+                    buf_count = -1; /* buffering off */
+                }
+            } else {
+                count = safe_read(fromCgi.rd, rbuf, PIPESIZE);
+                if (count <= 0)
+                    break;  /* eof (or error) */
+            }
+            if (full_write(1, rbuf, count) != count)
+                break;
+            if (DEBUG)
+                fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
+        } /* if (FD_ISSET(fromCgi.rd)) */
+    } /* while (1) */
+    log_and_exit();
+}
+#endif          /* FEATURE_HTTPD_CGI */
+
+/*
+ * Send a file response to a HTTP request, and exit
+ * 
+ * Parameters:
+ * const char *url    The requested URL (with leading /).
+ * headers            Don't send headers before if FALSE.
+ */
+static void send_file_and_exit(const char *url, int headers)
+{
+    static const char *const suffixTable[] = {
+    /* Warning: shorter equivalent suffix in one line must be first */
+        ".htm.html", "text/html",
+        ".jpg.jpeg", "image/jpeg",
+        ".gif",      "image/gif",
+        ".png",      "image/png",
+        ".txt.h.c.cc.cpp", "text/plain",
+        ".css",      "text/css",
+        ".wav",      "audio/wav",
+        ".avi",      "video/x-msvideo",
+        ".qt.mov",   "video/quicktime",
+        ".mpe.mpeg", "video/mpeg",
+        ".mid.midi", "audio/midi",
+        ".mp3",      "audio/mpeg",
+#if 0                        /* unpopular */
+        ".au",       "audio/basic",
+        ".pac",      "application/x-ns-proxy-autoconfig",
+        ".vrml.wrl", "model/vrml",
+#endif
+        NULL
+    };
+
+    char *suffix;
+    int f;
+    const char *const *table;
+    const char *try_suffix;
+    ssize_t count;
+#if ENABLE_FEATURE_HTTPD_USE_SENDFILE
+    off_t offset = 0;
+#endif
+
+    suffix = strrchr(url, '.');
+
+    /* If not found, set default as "application/octet-stream";  */
+    found_mime_type = "application/octet-stream";
+    if (suffix) {
+#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
+        Htaccess *cur;
+#endif
+        for (table = suffixTable; *table; table += 2) {
+            try_suffix = strstr(table[0], suffix);
+            if (try_suffix) {
+                try_suffix += strlen(suffix);
+                if (*try_suffix == '\0' || *try_suffix == '.') {
+                    found_mime_type = table[1];
+                    break;
+                }
+            }
+        }
+#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
+        for (cur = mime_a; cur; cur = cur->next) {
+            if (strcmp(cur->before_colon, suffix) == 0) {
+                found_mime_type = cur->after_colon;
+                break;
+            }
+        }
+#endif
+    }
+
+    if (DEBUG)
+        bb_error_msg("sending file '%s' content-type: %s",
+            url, found_mime_type);
+
+    f = open(url, O_RDONLY);
+    if (f < 0) {
+        if (DEBUG)
+            bb_perror_msg("cannot open '%s'", url);
+        if (headers)
+            send_headers_and_exit(HTTP_NOT_FOUND);
+    }
+
+    if (headers)
+        send_headers(HTTP_OK);
+
+    /* If you want to know about EPIPE below
+     * (happens if you abort downloads from local httpd): */
+    signal(SIGPIPE, SIG_IGN);
+
+#if ENABLE_FEATURE_HTTPD_USE_SENDFILE
+    do {
+        /* byte count (3rd arg) is rounded down to 64k */
+        count = sendfile(1, f, &offset, MAXINT(ssize_t) - 0xffff);
+        if (count < 0) {
+            if (offset == 0)
+                goto fallback;
+            goto fin;
+        }
+    } while (count > 0);
+    log_and_exit();
+
+ fallback:
+#endif
+    while ((count = safe_read(f, iobuf, IOBUF_SIZE)) > 0) {
+        ssize_t n = count;
+        count = full_write(1, iobuf, count);
+        if (count != n)
+            break;
+    }
+#if ENABLE_FEATURE_HTTPD_USE_SENDFILE
+ fin:
+#endif
+    if (count < 0 && verbose > 1)
+        bb_perror_msg("error");
+    log_and_exit();
+}
+
+static int checkPermIP(void)
+{
+    Htaccess_IP *cur;
+
+    /* This could stand some work */
+    for (cur = ip_a_d; cur; cur = cur->next) {
 #if DEBUG
-      if (WIFEXITED(status))
-          bb_error_msg("piped has exited with status=%d", WEXITSTATUS(status));
-      if (WIFSIGNALED(status))
-          bb_error_msg("piped has exited with signal=%d", WTERMSIG(status));
-#endif
-      break;
-    }
-      } else if(post_readed_size > 0 && FD_ISSET(outFd, &writeSet)) {
-        count = bb_full_write(outFd, wbuf + post_readed_idx, post_readed_size);
-        if(count > 0) {
-            post_readed_size -= count;
-            post_readed_idx += count;
-            if(post_readed_size == 0)
-                post_readed_idx = 0;
-        } else {
-            post_readed_size = post_readed_idx = bodyLen = 0; /* broken pipe to CGI */
-        }
-      } else if(bodyLen > 0 && post_readed_size == 0 && FD_ISSET(a_c_r, &readSet)) {
-        count = bodyLen > (int)sizeof(wbuf) ? (int)sizeof(wbuf) : bodyLen;
-        count = safe_read(a_c_r, wbuf, count);
-        if(count > 0) {
-            post_readed_size += count;
-            bodyLen -= count;
-        } else {
-            bodyLen = 0;    /* closed */
-        }
-      }
-      if(FD_ISSET(inFd, &readSet)) {
-    int s = a_c_w;
-    char *rbuf = config->buf;
-
-#ifndef PIPE_BUF
-# define PIPESIZE 4096          /* amount of buffering in a pipe */
+        fprintf(stderr,
+            "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
+            rmt_ip_str,
+            (unsigned char)(cur->ip >> 24),
+            (unsigned char)(cur->ip >> 16),
+            (unsigned char)(cur->ip >> 8),
+            (unsigned char)(cur->ip),
+            (unsigned char)(cur->mask >> 24),
+            (unsigned char)(cur->mask >> 16),
+            (unsigned char)(cur->mask >> 8),
+            (unsigned char)(cur->mask)
+        );
+#endif
+        if ((rmt_ip & cur->mask) == cur->ip)
+            return cur->allow_deny == 'A';   /* Allow/Deny */
+    }
+
+    /* if unconfigured, return 1 - access from all */
+    return !flg_deny_all;
+}
+
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+/*
+ * Check the permission file for access password protected.
+ *
+ * If config file isn't present, everything is allowed.
+ * Entries are of the form you can see example from header source
+ *
+ * path      The file path.
+ * request   User information to validate.
+ *
+ * Returns 1 if request is OK.
+ */
+static int checkPerm(const char *path, const char *request)
+{
+    Htaccess *cur;
+    const char *p;
+    const char *p0;
+
+    const char *prev = NULL;
+
+    /* This could stand some work */
+    for (cur = g_auth; cur; cur = cur->next) {
+        size_t l;
+
+        p0 = cur->before_colon;
+        if (prev != NULL && strcmp(prev, p0) != 0)
+            continue;       /* find next identical */
+        p = cur->after_colon;
+        if (DEBUG)
+            fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
+
+        l = strlen(p0);
+        if (strncmp(p0, path, l) == 0
+         && (l == 1 || path[l] == '/' || path[l] == '\0')
+        ) {
+            char *u;
+            /* path match found.  Check request */
+            /* for check next /path:user:password */
+            prev = p0;
+            u = strchr(request, ':');
+            if (u == NULL) {
+                /* bad request, ':' required */
+                break;
+            }
+
+            if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
+                char *cipher;
+                char *pp;
+
+                if (strncmp(p, request, u - request) != 0) {
+                    /* user doesn't match */
+                    continue;
+                }
+                pp = strchr(p, ':');
+                if (pp && pp[1] == '$' && pp[2] == '1'
+                 && pp[3] == '$' && pp[4]
+                ) {
+                    pp++;
+                    cipher = pw_encrypt(u+1, pp);
+                    if (strcmp(cipher, pp) == 0)
+                        goto set_remoteuser_var;   /* Ok */
+                    /* unauthorized */
+                    continue;
+                }
+            }
+
+            if (strcmp(p, request) == 0) {
+ set_remoteuser_var:
+                remoteuser = strdup(request);
+                if (remoteuser)
+                    remoteuser[u - request] = '\0';
+                return 1;   /* Ok */
+            }
+            /* unauthorized */
+        }
+    } /* for */
+
+    return prev == NULL;
+}
+#endif  /* FEATURE_HTTPD_BASIC_AUTH */
+
+/*
+ * Handle timeouts
+ */
+static void exit_on_signal(int sig) ATTRIBUTE_NORETURN;
+static void exit_on_signal(int sig)
+{
+    send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
+}
+
+/*
+ * Handle an incoming http request and exit.
+ */
+static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) ATTRIBUTE_NORETURN;
+static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
+{
+    static const char request_GET[] ALIGN1 = "GET";
+
+    struct stat sb;
+    char *urlcopy;
+    char *urlp;
+    char *tptr;
+    int http_major_version;
+    int ip_allowed;
+#if ENABLE_FEATURE_HTTPD_CGI
+    const char *prequest;
+    unsigned long length = 0;
+    char *cookie = 0;
+    char *content_type = 0;
+#endif
+    struct sigaction sa;
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+    int credentials = -1;  /* if not required this is Ok */
+#endif
+
+    /* Allocation of iobuf is postponed until now
+     * (IOW, server process doesn't need to waste 8k) */
+    iobuf = xmalloc(IOBUF_SIZE);
+
+    rmt_ip = 0;
+    if (fromAddr->sa.sa_family == AF_INET) {
+        rmt_ip = ntohl(fromAddr->sin.sin_addr.s_addr);
+    }
+#if ENABLE_FEATURE_IPV6
+    if (fromAddr->sa.sa_family == AF_INET6
+     && fromAddr->sin6.sin6_addr.s6_addr32[0] == 0
+     && fromAddr->sin6.sin6_addr.s6_addr32[1] == 0
+     && ntohl(fromAddr->sin6.sin6_addr.s6_addr32[2]) == 0xffff)
+        rmt_ip = ntohl(fromAddr->sin6.sin6_addr.s6_addr32[3]);
+#endif
+    if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
+        rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->sa);
+    }
+    if (verbose) {
+        /* this trick makes -v logging much simpler */
+        applet_name = rmt_ip_str;
+        if (verbose > 2)
+            bb_error_msg("connected");
+    }
+
+    /* Install timeout handler */
+    memset(&sa, 0, sizeof(sa));
+    sa.sa_handler = exit_on_signal;
+    /* sigemptyset(&sa.sa_mask); - memset should be enough */
+    /*sa.sa_flags = 0; - no SA_RESTART */
+    sigaction(SIGALRM, &sa, NULL);
+    alarm(HEADER_READ_TIMEOUT);
+
+    if (!get_line()) /* EOF or error or empty line */
+        send_headers_and_exit(HTTP_BAD_REQUEST);
+
+    /* Determine type of request (GET/POST) */
+    urlp = strpbrk(iobuf, " \t");
+    if (urlp == NULL)
+        send_headers_and_exit(HTTP_BAD_REQUEST);
+    *urlp++ = '\0';
+#if ENABLE_FEATURE_HTTPD_CGI
+    prequest = request_GET;
+    if (strcasecmp(iobuf, prequest) != 0) {
+        prequest = "POST";
+        if (strcasecmp(iobuf, prequest) != 0)
+            send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
+    }
 #else
-# define PIPESIZE PIPE_BUF
-#endif
-#if PIPESIZE >= MAX_MEMORY_BUFF
-# error "PIPESIZE >= MAX_MEMORY_BUFF"
-#endif
-
-    // There is something to read
-    count = safe_read(inFd, rbuf, PIPESIZE);
-    if (count == 0)
-        break;  /* closed */
-    if (count > 0) {
-      if (firstLine) {
-        rbuf[count] = 0;
-        /* check to see if the user script added headers */
-        if(strncmp(rbuf, "HTTP/1.0 200 OK\r\n", 4) != 0) {
-          bb_full_write(s, "HTTP/1.0 200 OK\r\n", 17);
-        }
-        if (strstr(rbuf, "ontent-") == 0) {
-          bb_full_write(s, "Content-type: text/plain\r\n\r\n", 28);
-        }
-        firstLine = 0;
-      }
-      if (bb_full_write(s, rbuf, count) != count)
-          break;
-
-#if DEBUG
-      fprintf(stderr, "cgi read %d bytes\n", count);
-#endif
-    }
-      }
-    }
-  }
-  return 0;
-}
-#endif          /* CONFIG_FEATURE_HTTPD_CGI */
-
-/****************************************************************************
- *
- > $Function: sendFile()
- *
- * $Description: Send a file response to an HTTP request
- *
- * $Parameter:
- *      (const char *) url . . The URL requested.
- *
- * $Return: (int)  . . . . . . Always 0.
- *
- ****************************************************************************/
-static int sendFile(const char *url)
-{
-  char * suffix;
-  int  f;
-  const char * const * table;
-  const char * try_suffix;
-
-  suffix = strrchr(url, '.');
-
-  for (table = suffixTable; *table; table += 2)
-    if(suffix != NULL && (try_suffix = strstr(*table, suffix)) != 0) {
-        try_suffix += strlen(suffix);
-        if(*try_suffix == 0 || *try_suffix == '.')
-            break;
-    }
-  /* also, if not found, set default as "application/octet-stream";  */
-  config->httpd_found.found_mime_type = *(table+1);
-#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
-  if (suffix) {
-    Htaccess * cur;
-
-    for (cur = config->mime_a; cur; cur = cur->next) {
-    if(strcmp(cur->before_colon, suffix) == 0) {
-        config->httpd_found.found_mime_type = cur->after_colon;
-        break;
-    }
-    }
-  }
-#endif  /* CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES */
-
-#if DEBUG
-  fprintf(stderr, "Sending file '%s' Content-type: %s\n",
-            url, config->httpd_found.found_mime_type);
-#endif
-
-  f = open(url, O_RDONLY);
-  if (f >= 0) {
-    int count;
-    char *buf = config->buf;
-
-    sendHeaders(HTTP_OK);
-    while ((count = bb_full_read(f, buf, MAX_MEMORY_BUFF)) > 0) {
-        if (bb_full_write(a_c_w, buf, count) != count)
-            break;
-    }
-    close(f);
-  } else {
-#if DEBUG
-    bb_perror_msg("Unable to open '%s'", url);
-#endif
-    sendHeaders(HTTP_NOT_FOUND);
-  }
-
-  return 0;
-}
-
-static int checkPermIP(void)
-{
-    Htaccess_IP * cur;
-
-    /* This could stand some work */
-    for (cur = config->ip_a_d; cur; cur = cur->next) {
-#if DEBUG
-    fprintf(stderr, "checkPermIP: '%s' ? ", config->rmt_ip_str);
-    fprintf(stderr, "'%u.%u.%u.%u/%u.%u.%u.%u'\n",
-        (unsigned char)(cur->ip >> 24),
-        (unsigned char)(cur->ip >> 16),
-        (unsigned char)(cur->ip >> 8),
-                cur->ip & 0xff,
-        (unsigned char)(cur->mask >> 24),
-        (unsigned char)(cur->mask >> 16),
-        (unsigned char)(cur->mask >> 8),
-                cur->mask & 0xff);
-#endif
-    if((config->rmt_ip & cur->mask) == cur->ip)
-        return cur->allow_deny == 'A';   /* Allow/Deny */
-    }
-
-    /* if unconfigured, return 1 - access from all */
-    return !config->flg_deny_all;
-}
-
-/****************************************************************************
- *
- > $Function: checkPerm()
- *
- * $Description: Check the permission file for access password protected.
- *
- *   If config file isn't present, everything is allowed.
- *   Entries are of the form you can see example from header source
- *
- * $Parameters:
- *      (const char *) path  . . . . The file path.
- *      (const char *) request . . . User information to validate.
- *
- * $Return: (int)  . . . . . . . . . 1 if request OK, 0 otherwise.
- *
- ****************************************************************************/
-
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-static int checkPerm(const char *path, const char *request)
-{
-    Htaccess * cur;
-    const char *p;
-    const char *p0;
-
-    const char *prev = NULL;
-
-    /* This could stand some work */
-    for (cur = config->auth; cur; cur = cur->next) {
-    p0 = cur->before_colon;
-    if(prev != NULL && strcmp(prev, p0) != 0)
-        continue;       /* find next identical */
-    p = cur->after_colon;
-#if DEBUG
-    fprintf(stderr,"checkPerm: '%s' ? '%s'\n", p0, request);
-#endif
+    if (strcasecmp(iobuf, request_GET) != 0)
+        send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
+#endif
+    urlp = skip_whitespace(urlp);
+    if (urlp[0] != '/')
+        send_headers_and_exit(HTTP_BAD_REQUEST);
+
+    /* Find end of URL and parse HTTP version, if any */
+    http_major_version = -1;
+    tptr = strchrnul(urlp, ' ');
+    /* Is it " HTTP/"? */
+    if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0)
+        http_major_version = (tptr[6] - '0');
+    *tptr = '\0';
+
+    /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
+    urlcopy = alloca((tptr - urlp) + sizeof("/index.html"));
+    /*if (urlcopy == NULL)
+     *  send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
+    strcpy(urlcopy, urlp);
+    /* NB: urlcopy ptr is never changed after this */
+
+    /* Extract url args if present */
+    tptr = strchr(urlcopy, '?');
+    g_query = NULL;
+    if (tptr) {
+        *tptr++ = '\0';
+        g_query = tptr;
+    }
+
+    /* Decode URL escape sequences */
+    tptr = decodeString(urlcopy, 0);
+    if (tptr == NULL)
+        send_headers_and_exit(HTTP_BAD_REQUEST);
+    if (tptr == urlcopy + 1) {
+        /* '/' or NUL is encoded */
+        send_headers_and_exit(HTTP_NOT_FOUND);
+    }
+
+    /* Canonicalize path */
+    /* Algorithm stolen from libbb bb_simplify_path(),
+     * but don't strdup and reducing trailing slash and protect out root */
+    urlp = tptr = urlcopy;
+    do {
+        if (*urlp == '/') {
+            /* skip duplicate (or initial) slash */
+            if (*tptr == '/') {
+                continue;
+            }
+            if (*tptr == '.') {
+                /* skip extra '.' */
+                if (tptr[1] == '/' || !tptr[1]) {
+                    continue;
+                }
+                /* '..': be careful */
+                if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
+                    ++tptr;
+                    if (urlp == urlcopy) /* protect root */
+                        send_headers_and_exit(HTTP_BAD_REQUEST);
+                    while (*--urlp != '/') /* omit previous dir */;
+                        continue;
+                }
+            }
+        }
+        *++urlp = *tptr;
+    } while (*++tptr);
+    *++urlp = '\0';       /* so keep last character */
+    tptr = urlp;          /* end ptr */
+
+    /* If URL is a directory, add '/' */
+    if (tptr[-1] != '/') {
+        if (is_directory(urlcopy + 1, 1, &sb)) {
+            found_moved_temporarily = urlcopy;
+        }
+    }
+
+    /* Log it */
+    if (verbose > 1)
+        bb_error_msg("url:%s", urlcopy);
+
+    tptr = urlcopy;
+    ip_allowed = checkPermIP();
+    while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
+        /* have path1/path2 */
+        *tptr = '\0';
+        if (is_directory(urlcopy + 1, 1, &sb)) {
+            /* may be having subdir config */
+            parse_conf(urlcopy + 1, SUBDIR_PARSE);
+            ip_allowed = checkPermIP();
+        }
+        *tptr = '/';
+    }
+    if (http_major_version >= 0) {
+        /* Request was with "... HTTP/nXXX", and n >= 0 */
+
+        /* Read until blank line for HTTP version specified, else parse immediate */
+        while (1) {
+            alarm(HEADER_READ_TIMEOUT);
+            if (!get_line())
+                break; /* EOF or error or empty line */
+            if (DEBUG)
+                bb_error_msg("header: '%s'", iobuf);
+
+#if ENABLE_FEATURE_HTTPD_CGI
+            /* try and do our best to parse more lines */
+            if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
+                /* extra read only for POST */
+                if (prequest != request_GET) {
+                    tptr = iobuf + sizeof("Content-length:") - 1;
+                    if (!tptr[0])
+                        send_headers_and_exit(HTTP_BAD_REQUEST);
+                    errno = 0;
+                    /* not using strtoul: it ignores leading minus! */
+                    length = strtol(tptr, &tptr, 10);
+                    /* length is "ulong", but we need to pass it to int later */
+                    /* so we check for negative or too large values in one go: */
+                    /* (long -> ulong conv caused negatives to be seen as > INT_MAX) */
+                    if (tptr[0] || errno || length > INT_MAX)
+                        send_headers_and_exit(HTTP_BAD_REQUEST);
+                }
+            } else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
+                cookie = strdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
+            } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
+                content_type = strdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
+            } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
+                referer = strdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
+            } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
+                user_agent = strdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
+            }
+#endif
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+            if (STRNCASECMP(iobuf, "Authorization:") == 0) {
+                /* We only allow Basic credentials.
+                 * It shows up as "Authorization: Basic <userid:password>" where
+                 * the userid:password is base64 encoded.
+                 */
+                tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
+                if (STRNCASECMP(tptr, "Basic") != 0)
+                    continue;
+                tptr += sizeof("Basic")-1;
+                /* decodeBase64() skips whitespace itself */
+                decodeBase64(tptr);
+                credentials = checkPerm(urlcopy, tptr);
+            }
+#endif          /* FEATURE_HTTPD_BASIC_AUTH */
+        } /* while extra header reading */
+    }
+
+    /* We read headers, disable peer timeout */
+    alarm(0);
+
+    if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || ip_allowed == 0) {
+        /* protect listing [/path]/httpd_conf or IP deny */
+        send_headers_and_exit(HTTP_FORBIDDEN);
+    }
+
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+    if (credentials <= 0 && checkPerm(urlcopy, ":") == 0) {
+        send_headers_and_exit(HTTP_UNAUTHORIZED);
+    }
+#endif
+
+    if (found_moved_temporarily) {
+        send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
+    }
+
+    tptr = urlcopy + 1;      /* skip first '/' */
+
+#if ENABLE_FEATURE_HTTPD_CGI
+    if (strncmp(tptr, "cgi-bin/", 8) == 0) {
+        if (tptr[8] == '\0') {
+            /* protect listing "cgi-bin/" */
+            send_headers_and_exit(HTTP_FORBIDDEN);
+        }
+        send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
+    }
+#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
     {
-        size_t l = strlen(p0);
-
-        if(strncmp(p0, path, l) == 0 &&
-                (l == 1 || path[l] == '/' || path[l] == 0)) {
-        char *u;
-        /* path match found.  Check request */
-        /* for check next /path:user:password */
-        prev = p0;
-        u = strchr(request, ':');
-        if(u == NULL) {
-            /* bad request, ':' required */
-            break;
-            }
-
-#ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5
-        {
-            char *cipher;
-            char *pp;
-
-            if(strncmp(p, request, u-request) != 0) {
-                /* user uncompared */
-                continue;
-            }
-            pp = strchr(p, ':');
-            if(pp && pp[1] == '$' && pp[2] == '1' &&
-                         pp[3] == '$' && pp[4]) {
-                pp++;
-                cipher = pw_encrypt(u+1, pp);
-                if (strcmp(cipher, pp) == 0)
-                    goto set_remoteuser_var;   /* Ok */
-                /* unauthorized */
-                continue;
-            }
-        }
-#endif
-        if (strcmp(p, request) == 0) {
-#ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5
-set_remoteuser_var:
-#endif
-            config->remoteuser = strdup(request);
-            if(config->remoteuser)
-            config->remoteuser[(u - request)] = 0;
-            return 1;   /* Ok */
-        }
-        /* unauthorized */
-        }
-    }
-    }   /* for */
-
-    return prev == NULL;
-}
-
-#endif  /* CONFIG_FEATURE_HTTPD_BASIC_AUTH */
-
-/****************************************************************************
- *
- > $Function: handle_sigalrm()
- *
- * $Description: Handle timeouts
- *
- ****************************************************************************/
-
-static void
-handle_sigalrm( int sig )
-{
-    sendHeaders(HTTP_REQUEST_TIMEOUT);
-    config->alarm_signaled = sig;
-}
-
-/****************************************************************************
- *
- > $Function: handleIncoming()
- *
- * $Description: Handle an incoming http request.
- *
- ****************************************************************************/
-static void handleIncoming(void)
-{
-  char *buf = config->buf;
-  char *url;
-  char *purl;
-  int  blank = -1;
-  char *test;
-  struct stat sb;
-  int ip_allowed;
-#ifdef CONFIG_FEATURE_HTTPD_CGI
-  const char *prequest = request_GET;
-  long length=0;
-  char *cookie = 0;
-  char *content_type = 0;
-#endif
-  fd_set s_fd;
-  struct timeval tv;
-  int retval;
-  struct sigaction sa;
-
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-  int credentials = -1;  /* if not requred this is Ok */
-#endif
-
-  sa.sa_handler = handle_sigalrm;
-  sigemptyset(&sa.sa_mask);
-  sa.sa_flags = 0; /* no SA_RESTART */
-  sigaction(SIGALRM, &sa, NULL);
-
-  do {
-    int  count;
-
-    (void) alarm( TIMEOUT );
-    if (getLine() <= 0)
-    break;  /* closed */
-
-    purl = strpbrk(buf, " \t");
-    if(purl == NULL) {
-BAD_REQUEST:
-      sendHeaders(HTTP_BAD_REQUEST);
-      break;
-    }
-    *purl = 0;
-#ifdef CONFIG_FEATURE_HTTPD_CGI
-    if(strcasecmp(buf, prequest) != 0) {
-    prequest = "POST";
-    if(strcasecmp(buf, prequest) != 0) {
-        sendHeaders(HTTP_NOT_IMPLEMENTED);
-        break;
-    }
-    }
+        char *suffix = strrchr(tptr, '.');
+        if (suffix) {
+            Htaccess *cur;
+            for (cur = script_i; cur; cur = cur->next) {
+                if (strcmp(cur->before_colon + 1, suffix) == 0) {
+                    send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
+                }
+            }
+        }
+    }
+#endif
+    if (prequest != request_GET) {
+        send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
+    }
+#endif  /* FEATURE_HTTPD_CGI */
+
+    if (urlp[-1] == '/')
+        strcpy(urlp, "index.html");
+    if (stat(tptr, &sb) == 0) {
+        /* It's a dir URL and there is index.html */
+        ContentLength = sb.st_size;
+        last_mod = sb.st_mtime;
+    }
+#if ENABLE_FEATURE_HTTPD_CGI
+    else if (urlp[-1] == '/') {
+        /* It's a dir URL and there is no index.html
+         * Try cgi-bin/index.cgi */
+        if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
+            urlp[0] = '\0';
+            g_query = urlcopy;
+            send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
+        }
+    }
+#endif
+    /* else {
+     *  fall through to send_file, it errors out if open fails
+     * }
+     */
+
+    send_file_and_exit(tptr, TRUE);
+}
+
+/*
+ * The main http server function.
+ * Given a socket, listen for new connections and farm out
+ * the processing as a [v]forked process.
+ * Never returns.
+ */
+#if BB_MMU
+static void mini_httpd(int server_socket) ATTRIBUTE_NORETURN;
+static void mini_httpd(int server_socket)
+{
+    /* NB: it's best to not use xfuncs in this loop before fork().
+     * Otherwise server may die on transient errors (temporary
+     * out-of-memory condition, etc), which is Bad(tm).
+     * Try to do any dangerous calls after fork.
+     */
+    while (1) {
+        int n;
+        len_and_sockaddr fromAddr;
+        
+        /* Wait for connections... */
+        fromAddr.len = LSA_SIZEOF_SA;
+        n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
+
+        if (n < 0)
+            continue;
+        /* set the KEEPALIVE option to cull dead connections */
+        setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
+
+        if (fork() == 0) {
+            /* child */
+#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
+            /* Do not reload config on HUP */
+            signal(SIGHUP, SIG_IGN);
+#endif
+            close(server_socket);
+            xmove_fd(n, 0);
+            xdup2(0, 1);
+
+            handle_incoming_and_exit(&fromAddr);
+        }
+        /* parent, or fork failed */
+        close(n);
+    } /* while (1) */
+    /* never reached */
+}
 #else
-    if(strcasecmp(buf, request_GET) != 0) {
-    sendHeaders(HTTP_NOT_IMPLEMENTED);
-    break;
-    }
-#endif
-    *purl = ' ';
-    count = sscanf(purl, " %[^ ] HTTP/%d.%*d", buf, &blank);
-
-    if (count < 1 || buf[0] != '/') {
-      /* Garbled request/URL */
-      goto BAD_REQUEST;
-    }
-    url = alloca(strlen(buf) + 12);      /* + sizeof("/index.html\0") */
-    if(url == NULL) {
-    sendHeaders(HTTP_INTERNAL_SERVER_ERROR);
-    break;
-    }
-    strcpy(url, buf);
-    /* extract url args if present */
-    test = strchr(url, '?');
-    if (test) {
-      *test++ = 0;
-      config->query = test;
-    }
-
-    test = decodeString(url, 0);
-    if(test == NULL)
-    goto BAD_REQUEST;
-    if(test == (buf+1)) {
-    sendHeaders(HTTP_NOT_FOUND);
-    break;
-    }
-    /* algorithm stolen from libbb bb_simplify_path(),
-       but don`t strdup and reducing trailing slash and protect out root */
-    purl = test = url;
-
-    do {
-    if (*purl == '/') {
-        if (*test == '/') {        /* skip duplicate (or initial) slash */
-        continue;
-        } else if (*test == '.') {
-        if (test[1] == '/' || test[1] == 0) { /* skip extra '.' */
-            continue;
-        } else if ((test[1] == '.') && (test[2] == '/' || test[2] == 0)) {
-            ++test;
-            if (purl == url) {
-            /* protect out root */
-            goto BAD_REQUEST;
-            }
-            while (*--purl != '/');    /* omit previous dir */
-            continue;
-        }
-        }
-    }
-    *++purl = *test;
-    } while (*++test);
-
-    *++purl = 0;        /* so keep last character */
-    test = purl;        /* end ptr */
-
-    /* If URL is directory, adding '/' */
-    if(test[-1] != '/') {
-        if ( is_directory(url + 1, 1, &sb) ) {
-            config->httpd_found.found_moved_temporarily = url;
-        }
-    }
-#if DEBUG
-    fprintf(stderr, "url='%s', args=%s\n", url, config->query);
-#endif
-
-    test = url;
-    ip_allowed = checkPermIP();
-    while(ip_allowed && (test = strchr( test + 1, '/' )) != NULL) {
-    /* have path1/path2 */
-    *test = '\0';
-    if( is_directory(url + 1, 1, &sb) ) {
-        /* may be having subdir config */
-        parse_conf(url + 1, SUBDIR_PARSE);
-        ip_allowed = checkPermIP();
-    }
-    *test = '/';
-    }
-    if(blank >= 0) {
-      // read until blank line for HTTP version specified, else parse immediate
-      while(1) {
-    alarm(TIMEOUT);
-    count = getLine();
-    if(count <= 0)
-        break;
-
-#if DEBUG
-    fprintf(stderr, "Header: '%s'\n", buf);
-#endif
-
-#ifdef CONFIG_FEATURE_HTTPD_CGI
-    /* try and do our best to parse more lines */
-    if ((strncasecmp(buf, Content_length, 15) == 0)) {
-      if(prequest != request_GET)
-          length = strtol(buf + 15, 0, 0); // extra read only for POST
-    } else if ((strncasecmp(buf, "Cookie:", 7) == 0)) {
-          for(test = buf + 7; isspace(*test); test++)
-              ;
-          cookie = strdup(test);
-    } else if ((strncasecmp(buf, "Content-Type:", 13) == 0)) {
-          for(test = buf + 13; isspace(*test); test++)
-              ;
-          content_type = strdup(test);
-    } else if ((strncasecmp(buf, "Referer:", 8) == 0)) {
-          for(test = buf + 8; isspace(*test); test++)
-              ;
-          config->referer = strdup(test);
-    }
-#endif
-
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-    if (strncasecmp(buf, "Authorization:", 14) == 0) {
-      /* We only allow Basic credentials.
-       * It shows up as "Authorization: Basic <userid:password>" where
-       * the userid:password is base64 encoded.
-       */
-      for(test = buf + 14; isspace(*test); test++)
-          ;
-      if (strncasecmp(test, "Basic", 5) != 0)
-          continue;
-
-      test += 5;  /* decodeBase64() skiping space self */
-      decodeBase64(test);
-      credentials = checkPerm(url, test);
-    }
-#endif          /* CONFIG_FEATURE_HTTPD_BASIC_AUTH */
-
-      }   /* while extra header reading */
-    }
-    (void) alarm( 0 );
-    if(config->alarm_signaled)
-    break;
-
-    if (strcmp(strrchr(url, '/') + 1, httpd_conf) == 0 || ip_allowed == 0) {
-        /* protect listing [/path]/httpd_conf or IP deny */
-#ifdef CONFIG_FEATURE_HTTPD_CGI
-FORBIDDEN:      /* protect listing /cgi-bin */
-#endif
-        sendHeaders(HTTP_FORBIDDEN);
-        break;
-    }
-
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-    if (credentials <= 0 && checkPerm(url, ":") == 0) {
-      sendHeaders(HTTP_UNAUTHORIZED);
-      break;
-    }
-#endif
-
-    if(config->httpd_found.found_moved_temporarily) {
-    sendHeaders(HTTP_MOVED_TEMPORARILY);
-#if DEBUG
-    /* clear unforked memory flag */
-    config->httpd_found.found_moved_temporarily = NULL;
-#endif
-    break;
-    }
-
-    test = url + 1;      /* skip first '/' */
-
-#ifdef CONFIG_FEATURE_HTTPD_CGI
-    /* if strange Content-Length */
-    if (length < 0)
-    break;
-
-    if (strncmp(test, "cgi-bin", 7) == 0) {
-        if(test[7] == '/' && test[8] == 0)
-            goto FORBIDDEN;     // protect listing cgi-bin/
-        sendCgi(url, prequest, length, cookie, content_type);
-    } else {
-    if (prequest != request_GET)
-        sendHeaders(HTTP_NOT_IMPLEMENTED);
-    else {
-#endif  /* CONFIG_FEATURE_HTTPD_CGI */
-        if(purl[-1] == '/')
-            strcpy(purl, "index.html");
-        if ( stat(test, &sb ) == 0 ) {
-            config->ContentLength = sb.st_size;
-            config->last_mod = sb.st_mtime;
-        }
-        sendFile(test);
-#ifdef CONFIG_FEATURE_HTTPD_WITHOUT_INETD
-        /* unset if non inetd looped */
-        config->ContentLength = -1;
-#endif
-
-#ifdef CONFIG_FEATURE_HTTPD_CGI
-    }
-    }
-#endif
-
-  } while (0);
-
-
-#ifdef CONFIG_FEATURE_HTTPD_WITHOUT_INETD
-/* from inetd don`t looping: freeing, closing automatic from exit always */
-# if DEBUG
-  fprintf(stderr, "closing socket\n");
-# endif
-# ifdef CONFIG_FEATURE_HTTPD_CGI
-  free(cookie);
-  free(content_type);
-  free(config->referer);
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-  free(config->remoteuser);
-#endif
-# endif
-#endif  /* CONFIG_FEATURE_HTTPD_WITHOUT_INETD */
-  shutdown(a_c_w, SHUT_WR);
-
-  /* Properly wait for remote to closed */
-  FD_ZERO (&s_fd) ;
-  FD_SET (a_c_r, &s_fd) ;
-
-  do {
-    tv.tv_sec = 2 ;
-    tv.tv_usec = 0 ;
-    retval = select (a_c_r + 1, &s_fd, NULL, NULL, &tv);
-  } while (retval > 0 && (read (a_c_r, buf, sizeof (config->buf)) > 0));
-
-  shutdown(a_c_r, SHUT_RD);
-#ifdef CONFIG_FEATURE_HTTPD_WITHOUT_INETD
-  close(config->accepted_socket);
-#endif  /* CONFIG_FEATURE_HTTPD_WITHOUT_INETD */
-}
-
-/****************************************************************************
- *
- > $Function: miniHttpd()
- *
- * $Description: The main http server function.
- *
- *   Given an open socket fildes, listen for new connections and farm out
- *   the processing as a forked process.
- *
- * $Parameters:
- *      (int) server. . . The server socket fildes.
- *
- * $Return: (int) . . . . Always 0.
- *
- ****************************************************************************/
-#ifdef CONFIG_FEATURE_HTTPD_WITHOUT_INETD
-static int miniHttpd(int server)
-{
-  fd_set readfd, portfd;
-
-  FD_ZERO(&portfd);
-  FD_SET(server, &portfd);
-
-  /* copy the ports we are watching to the readfd set */
-  while (1) {
-    readfd = portfd;
-
-    /* Now wait INDEFINITELY on the set of sockets! */
-    if (select(server + 1, &readfd, 0, 0, 0) > 0) {
-      if (FD_ISSET(server, &readfd)) {
-    int on;
-    struct sockaddr_in fromAddr;
-
-    socklen_t fromAddrLen = sizeof(fromAddr);
-    int s = accept(server,
-               (struct sockaddr *)&fromAddr, &fromAddrLen);
-
-    if (s < 0) {
-        continue;
-    }
-    config->accepted_socket = s;
-    config->rmt_ip = ntohl(fromAddr.sin_addr.s_addr);
-#if defined(CONFIG_FEATURE_HTTPD_CGI) || DEBUG
-    sprintf(config->rmt_ip_str, "%u.%u.%u.%u",
-        (unsigned char)(config->rmt_ip >> 24),
-        (unsigned char)(config->rmt_ip >> 16),
-        (unsigned char)(config->rmt_ip >> 8),
-                config->rmt_ip & 0xff);
-    config->port = ntohs(fromAddr.sin_port);
-#if DEBUG
-    bb_error_msg("connection from IP=%s, port %u\n",
-                    config->rmt_ip_str, config->port);
-#endif
-#endif /* CONFIG_FEATURE_HTTPD_CGI */
-
-    /*  set the KEEPALIVE option to cull dead connections */
-    on = 1;
-    setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, sizeof (on));
-
-#if !DEBUG
-    if (fork() == 0)
-#endif
-    {
-        /* This is the spawned thread */
-#ifdef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
-        /* protect reload config, may be confuse checking */
-        signal(SIGHUP, SIG_IGN);
-#endif
-        handleIncoming();
-#if !DEBUG
-        exit(0);
-#endif
-    }
-    close(s);
-      }
-    }
-  } // while (1)
-  return 0;
-}
-
-#else
-    /* from inetd */
-
-static int miniHttpd(void)
-{
-  struct sockaddr_in fromAddrLen;
-  socklen_t sinlen = sizeof (struct sockaddr_in);
-
-  getpeername (0, (struct sockaddr *)&fromAddrLen, &sinlen);
-  config->rmt_ip = ntohl(fromAddrLen.sin_addr.s_addr);
-#ifdef CONFIG_FEATURE_HTTPD_CGI
-  sprintf(config->rmt_ip_str, "%u.%u.%u.%u",
-        (unsigned char)(config->rmt_ip >> 24),
-        (unsigned char)(config->rmt_ip >> 16),
-        (unsigned char)(config->rmt_ip >> 8),
-                config->rmt_ip & 0xff);
-#endif
-  config->port = ntohs(fromAddrLen.sin_port);
-  handleIncoming();
-  return 0;
-}
-#endif  /* CONFIG_FEATURE_HTTPD_WITHOUT_INETD */
-
-#ifdef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
+static void mini_httpd_nommu(int server_socket, int argc, char **argv) ATTRIBUTE_NORETURN;
+static void mini_httpd_nommu(int server_socket, int argc, char **argv)
+{
+    char *argv_copy[argc + 2];
+
+    argv_copy[0] = argv[0];
+    argv_copy[1] = (char*)"-i";
+    memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
+
+    /* NB: it's best to not use xfuncs in this loop before vfork().
+     * Otherwise server may die on transient errors (temporary
+     * out-of-memory condition, etc), which is Bad(tm).
+     * Try to do any dangerous calls after fork.
+     */
+    while (1) {
+        int n;
+        len_and_sockaddr fromAddr;
+        
+        /* Wait for connections... */
+        fromAddr.len = LSA_SIZEOF_SA;
+        n = accept(server_socket, &fromAddr.sa, &fromAddr.len);
+
+        if (n < 0)
+            continue;
+        /* set the KEEPALIVE option to cull dead connections */
+        setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
+
+        if (vfork() == 0) {
+            /* child */
+#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
+            /* Do not reload config on HUP */
+            signal(SIGHUP, SIG_IGN);
+#endif
+            close(server_socket);
+            xmove_fd(n, 0);
+            xdup2(0, 1);
+
+            /* Run a copy of ourself in inetd mode */
+            re_exec(argv_copy);
+        }
+        /* parent, or vfork failed */
+        close(n);
+    } /* while (1) */
+    /* never reached */
+}
+#endif
+
+/*
+ * Process a HTTP connection on stdin/out.
+ * Never returns.
+ */
+static void mini_httpd_inetd(void) ATTRIBUTE_NORETURN;
+static void mini_httpd_inetd(void)
+{
+    len_and_sockaddr fromAddr;
+
+    fromAddr.len = LSA_SIZEOF_SA;
+    getpeername(0, &fromAddr.sa, &fromAddr.len);
+    handle_incoming_and_exit(&fromAddr);
+}
+
+#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
 static void sighup_handler(int sig)
 {
-    /* set and reset */
     struct sigaction sa;
 
-    parse_conf(default_path_httpd_conf,
-            sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
+    parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
+
+    memset(&sa, 0, sizeof(sa));
     sa.sa_handler = sighup_handler;
-    sigemptyset(&sa.sa_mask);
+    /*sigemptyset(&sa.sa_mask); - memset should be enough */
     sa.sa_flags = SA_RESTART;
     sigaction(SIGHUP, &sa, NULL);
@@ -1891 +1986 @@
 #endif
 
-enum httpd_opts_nums {
+enum {
     c_opt_config_file = 0,
     d_opt_decode_url,
     h_opt_home_httpd,
     USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
-    USE_FEATURE_HTTPD_BASIC_AUTH(r_opt_realm,)
-    USE_FEATURE_HTTPD_AUTH_MD5(m_opt_md5,)
-    USE_FEATURE_HTTPD_SETUID(u_opt_setuid,)
-    USE_FEATURE_HTTPD_WITHOUT_INETD(p_opt_port,)
+    USE_FEATURE_HTTPD_BASIC_AUTH(    r_opt_realm     ,)
+    USE_FEATURE_HTTPD_AUTH_MD5(      m_opt_md5       ,)
+    USE_FEATURE_HTTPD_SETUID(        u_opt_setuid    ,)
+    p_opt_port      ,
+    p_opt_inetd     ,
+    p_opt_foreground,
+    p_opt_verbose   ,
+    OPT_CONFIG_FILE = 1 << c_opt_config_file,
+    OPT_DECODE_URL  = 1 << d_opt_decode_url,
+    OPT_HOME_HTTPD  = 1 << h_opt_home_httpd,
+    OPT_ENCODE_URL  = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
+    OPT_REALM       = USE_FEATURE_HTTPD_BASIC_AUTH(    (1 << r_opt_realm     )) + 0,
+    OPT_MD5         = USE_FEATURE_HTTPD_AUTH_MD5(      (1 << m_opt_md5       )) + 0,
+    OPT_SETUID      = USE_FEATURE_HTTPD_SETUID(        (1 << u_opt_setuid    )) + 0,
+    OPT_PORT        = 1 << p_opt_port,
+    OPT_INETD       = 1 << p_opt_inetd,
+    OPT_FOREGROUND  = 1 << p_opt_foreground,
+    OPT_VERBOSE     = 1 << p_opt_verbose,
 };
 
-static const char httpd_opts[]="c:d:h:"
-    USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
-    USE_FEATURE_HTTPD_BASIC_AUTH("r:")
-    USE_FEATURE_HTTPD_AUTH_MD5("m:")
-    USE_FEATURE_HTTPD_SETUID("u:")
-    USE_FEATURE_HTTPD_WITHOUT_INETD("p:");
-
-#define OPT_CONFIG_FILE (1<<c_opt_config_file)
-#define OPT_DECODE_URL  (1<<d_opt_decode_url)
-#define OPT_HOME_HTTPD  (1<<h_opt_home_httpd)
-
-#define OPT_ENCODE_URL  USE_FEATURE_HTTPD_ENCODE_URL_STR((1<<e_opt_encode_url)) \
-            SKIP_FEATURE_HTTPD_ENCODE_URL_STR(0)
-
-#define OPT_REALM       USE_FEATURE_HTTPD_BASIC_AUTH((1<<r_opt_realm)) \
-            SKIP_FEATURE_HTTPD_BASIC_AUTH(0)
-
-#define OPT_MD5         USE_FEATURE_HTTPD_AUTH_MD5((1<<m_opt_md5)) \
-            SKIP_FEATURE_HTTPD_AUTH_MD5(0)
-
-#define OPT_SETUID      USE_FEATURE_HTTPD_SETUID((1<<u_opt_setuid)) \
-            SKIP_FEATURE_HTTPD_SETUID(0)
-
-#define OPT_PORT        USE_FEATURE_HTTPD_WITHOUT_INETD((1<<p_opt_port)) \
-            SKIP_FEATURE_HTTPD_WITHOUT_INETD(0)
-
-
-int httpd_main(int argc, char *argv[])
-{
-  unsigned long opt;
-  const char *home_httpd = home;
-  char *url_for_decode;
-  USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
-  USE_FEATURE_HTTPD_WITHOUT_INETD(const char *s_port;)
-  USE_FEATURE_HTTPD_WITHOUT_INETD(int server;)
-
-  USE_FEATURE_HTTPD_SETUID(const char *s_uid;)
-  USE_FEATURE_HTTPD_SETUID(long uid = -1;)
-
-  USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
-
-  config = xcalloc(1, sizeof(*config));
-#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
-  config->realm = "Web Server Authentication";
-#endif
-
-#ifdef CONFIG_FEATURE_HTTPD_WITHOUT_INETD
-  config->port = 80;
-#endif
-
-  config->ContentLength = -1;
-
-  opt = bb_getopt_ulflags(argc, argv, httpd_opts,
-            &(config->configFile), &url_for_decode, &home_httpd
+
+int httpd_main(int argc, char **argv);
+int httpd_main(int argc, char **argv)
+{
+    int server_socket = server_socket; /* for gcc */
+    unsigned opt;
+    char *url_for_decode;
+    USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
+    USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
+    USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
+    USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
+
+    INIT_G();
+
+#if ENABLE_LOCALE_SUPPORT
+    /* Undo busybox.c: we want to speak English in http (dates etc) */
+    setlocale(LC_TIME, "C");
+#endif
+
+    home_httpd = xrealloc_getcwd_or_warn(NULL);
+    /* -v counts, -i implies -f */
+    opt_complementary = "vv:if";
+    /* We do not "absolutize" path given by -h (home) opt.
+     * If user gives relative path in -h, $SCRIPT_FILENAME can end up
+     * relative too. */
+    opt = getopt32(argv, "c:d:h:"
+            USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
+            USE_FEATURE_HTTPD_BASIC_AUTH("r:")
+            USE_FEATURE_HTTPD_AUTH_MD5("m:")
+            USE_FEATURE_HTTPD_SETUID("u:")
+            "p:ifv",
+            &configFile, &url_for_decode, &home_httpd
             USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
-            USE_FEATURE_HTTPD_BASIC_AUTH(, &(config->realm))
+            USE_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
             USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
-            USE_FEATURE_HTTPD_SETUID(, &s_uid)
-            USE_FEATURE_HTTPD_WITHOUT_INETD(, &s_port)
-    );
-
-  if(opt & OPT_DECODE_URL) {
-      printf("%s", decodeString(url_for_decode, 1));
-      return 0;
-  }
-#ifdef CONFIG_FEATURE_HTTPD_ENCODE_URL_STR
-  if(opt & OPT_ENCODE_URL) {
-      printf("%s", encodeString(url_for_encode));
-      return 0;
-  }
-#endif
-#ifdef CONFIG_FEATURE_HTTPD_AUTH_MD5
-  if(opt & OPT_MD5) {
-      printf("%s\n", pw_encrypt(pass, "$1$"));
-      return 0;
-  }
-#endif
-#ifdef CONFIG_FEATURE_HTTPD_WITHOUT_INETD
-    if(opt & OPT_PORT)
-    config->port = bb_xgetlarg(s_port, 10, 1, 0xffff);
-#ifdef CONFIG_FEATURE_HTTPD_SETUID
-    if(opt & OPT_SETUID) {
-    char *e;
-
-    uid = strtol(s_uid, &e, 0);
-    if(*e != '\0') {
-        /* not integer */
-        uid = bb_xgetpwnam(s_uid);
-    }
-      }
-#endif
-#endif
-
-  bb_xchdir(home_httpd);
-#ifdef CONFIG_FEATURE_HTTPD_WITHOUT_INETD
-  server = openServer();
-# ifdef CONFIG_FEATURE_HTTPD_SETUID
-  /* drop privileges */
-  if(uid > 0)
-    setuid(uid);
-# endif
-#endif
-
-#ifdef CONFIG_FEATURE_HTTPD_CGI
-   {
-    char *p = getenv("PATH");
-    if(p) {
-        p = bb_xstrdup(p);
-    }
-    clearenv();
-    if(p)
-        setenv("PATH", p, 1);
-# ifdef CONFIG_FEATURE_HTTPD_WITHOUT_INETD
-    addEnvPort("SERVER");
-# endif
-   }
-#endif
-
-#ifdef CONFIG_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
-  sighup_handler(0);
+            USE_FEATURE_HTTPD_SETUID(, &s_ugid)
+            , &bind_addr_or_port
+            , &verbose
+        );
+    if (opt & OPT_DECODE_URL) {
+        fputs(decodeString(url_for_decode, 1), stdout);
+        return 0;
+    }
+#if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
+    if (opt & OPT_ENCODE_URL) {
+        fputs(encodeString(url_for_encode), stdout);
+        return 0;
+    }
+#endif
+#if ENABLE_FEATURE_HTTPD_AUTH_MD5
+    if (opt & OPT_MD5) {
+        puts(pw_encrypt(pass, "$1$"));
+        return 0;
+    }
+#endif
+#if ENABLE_FEATURE_HTTPD_SETUID
+    if (opt & OPT_SETUID) {
+        if (!get_uidgid(&ugid, s_ugid, 1))
+            bb_error_msg_and_die("unrecognized user[:group] "
+                        "name '%s'", s_ugid);
+    }
+#endif
+
+#if !BB_MMU
+    if (!(opt & OPT_FOREGROUND)) {
+        bb_daemonize_or_rexec(0, argv); /* don't change current directory */
+    }
+#endif
+
+    xchdir(home_httpd);
+    if (!(opt & OPT_INETD)) {
+        signal(SIGCHLD, SIG_IGN);
+        server_socket = openServer();
+#if ENABLE_FEATURE_HTTPD_SETUID
+        /* drop privileges */
+        if (opt & OPT_SETUID) {
+            if (ugid.gid != (gid_t)-1) {
+                if (setgroups(1, &ugid.gid) == -1)
+                    bb_perror_msg_and_die("setgroups");
+                xsetgid(ugid.gid);
+            }
+            xsetuid(ugid.uid);
+        }
+#endif
+    }
+
+#if ENABLE_FEATURE_HTTPD_CGI
+    {
+        char *p = getenv("PATH");
+        /* env strings themself are not freed, no need to strdup(p): */
+        clearenv();
+        if (p)
+            putenv(p - 5);
+//      if (!(opt & OPT_INETD))
+//          setenv_long("SERVER_PORT", ???);
+    }
+#endif
+
+#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
+    if (!(opt & OPT_INETD))
+        sighup_handler(0);
+    else /* do not install HUP handler in inetd mode */
+#endif
+        parse_conf(default_path_httpd_conf, FIRST_PARSE);
+
+    xfunc_error_retval = 0;
+    if (opt & OPT_INETD)
+        mini_httpd_inetd();
+#if BB_MMU
+    if (!(opt & OPT_FOREGROUND))
+        bb_daemonize(0); /* don't change current directory */
+    mini_httpd(server_socket); /* never returns */
 #else
-  parse_conf(default_path_httpd_conf, FIRST_PARSE);
-#endif
-
-#ifdef CONFIG_FEATURE_HTTPD_WITHOUT_INETD
-# if !DEBUG
-  bb_xdaemon(1, 0);     /* don`t change curent directory */
-# endif
-  return miniHttpd(server);
-#else
-  return miniHttpd();
-#endif
-}
+    mini_httpd_nommu(server_socket, argc, argv); /* never returns */
+#endif
+    /* return 0; */
+}