1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * httpd implementation for busybox
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4 | *
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5 | * Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org>
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6 | * Copyright (C) 2003-2006 Vladimir Oleynik <dzo@simtreas.ru>
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7 | *
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8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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9 | *
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10 | *****************************************************************************
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11 | *
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12 | * Typical usage:
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13 | * For non root user:
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14 | * httpd -p 8080 -h $HOME/public_html
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15 | * For daemon start from rc script with uid=0:
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16 | * httpd -u www
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17 | * which is equivalent to (assuming user www has uid 80):
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18 | * httpd -p 80 -u 80 -h $PWD -c /etc/httpd.conf -r "Web Server Authentication"
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19 | *
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20 | * When an url starts with "/cgi-bin/" it is assumed to be a cgi script.
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21 | * The server changes directory to the location of the script and executes it
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22 | * after setting QUERY_STRING and other environment variables.
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23 | *
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24 | * If directory URL is given, no index.html is found and CGI support is enabled,
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25 | * cgi-bin/index.cgi will be run. Directory to list is ../$QUERY_STRING.
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26 | * See httpd_indexcgi.c for an example GCI code.
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27 | *
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28 | * Doc:
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29 | * "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html
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30 | *
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31 | * The applet can also be invoked as an url arg decoder and html text encoder
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32 | * as follows:
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33 | * foo=`httpd -d $foo` # decode "Hello%20World" as "Hello World"
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34 | * bar=`httpd -e "<Hello World>"` # encode as "<Hello World>"
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35 | * Note that url encoding for arguments is not the same as html encoding for
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36 | * presentation. -d decodes an url-encoded argument while -e encodes in html
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37 | * for page display.
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38 | *
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39 | * httpd.conf has the following format:
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40 | *
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41 | * H:/serverroot # define the server root. It will override -h
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42 | * A:172.20. # Allow address from 172.20.0.0/16
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43 | * A:10.0.0.0/25 # Allow any address from 10.0.0.0-10.0.0.127
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44 | * A:10.0.0.0/255.255.255.128 # Allow any address that previous set
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45 | * A:127.0.0.1 # Allow local loopback connections
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46 | * D:* # Deny from other IP connections
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47 | * E404:/path/e404.html # /path/e404.html is the 404 (not found) error page
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48 | * I:index.html # Show index.html when a directory is requested
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49 | *
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50 | * P:/url:[http://]hostname[:port]/new/path
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51 | * # When /urlXXXXXX is requested, reverse proxy
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52 | * # it to http://hostname[:port]/new/pathXXXXXX
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53 | *
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54 | * /cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/
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55 | * /adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/
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56 | * /adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/
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57 | * /adm:root:* # or user root, pwd from /etc/passwd on urls starting with /adm/
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58 | * /wiki:*:* # or any user from /etc/passwd with according pwd on urls starting with /wiki/
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59 | * .au:audio/basic # additional mime type for audio.au files
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60 | * *.php:/path/php # run xxx.php through an interpreter
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61 | *
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62 | * A/D may be as a/d or allow/deny - only first char matters.
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63 | * Deny/Allow IP logic:
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64 | * - Default is to allow all (Allow all (A:*) is a no-op).
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65 | * - Deny rules take precedence over allow rules.
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66 | * - "Deny all" rule (D:*) is applied last.
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67 | *
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68 | * Example:
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69 | * 1. Allow only specified addresses
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70 | * A:172.20 # Allow any address that begins with 172.20.
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71 | * A:10.10. # Allow any address that begins with 10.10.
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72 | * A:127.0.0.1 # Allow local loopback connections
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73 | * D:* # Deny from other IP connections
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74 | *
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75 | * 2. Only deny specified addresses
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76 | * D:1.2.3. # deny from 1.2.3.0 - 1.2.3.255
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77 | * D:2.3.4. # deny from 2.3.4.0 - 2.3.4.255
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78 | * A:* # (optional line added for clarity)
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79 | *
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80 | * If a sub directory contains config file, it is parsed and merged with
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81 | * any existing settings as if it was appended to the original configuration.
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82 | *
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83 | * subdir paths are relative to the containing subdir and thus cannot
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84 | * affect the parent rules.
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85 | *
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86 | * Note that since the sub dir is parsed in the forked thread servicing the
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87 | * subdir http request, any merge is discarded when the process exits. As a
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88 | * result, the subdir settings only have a lifetime of a single request.
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89 | *
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90 | * Custom error pages can contain an absolute path or be relative to
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91 | * 'home_httpd'. Error pages are to be static files (no CGI or script). Error
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92 | * page can only be defined in the root configuration file and are not taken
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93 | * into account in local (directories) config files.
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94 | *
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95 | * If -c is not set, an attempt will be made to open the default
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96 | * root configuration file. If -c is set and the file is not found, the
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97 | * server exits with an error.
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98 | *
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99 | */
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100 | /* TODO: use TCP_CORK, parse_config() */
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101 |
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102 | //usage:#define httpd_trivial_usage
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103 | //usage: "[-ifv[v]]"
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104 | //usage: " [-c CONFFILE]"
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105 | //usage: " [-p [IP:]PORT]"
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106 | //usage: IF_FEATURE_HTTPD_SETUID(" [-u USER[:GRP]]")
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107 | //usage: IF_FEATURE_HTTPD_BASIC_AUTH(" [-r REALM]")
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108 | //usage: " [-h HOME]\n"
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109 | //usage: "or httpd -d/-e" IF_FEATURE_HTTPD_AUTH_MD5("/-m") " STRING"
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110 | //usage:#define httpd_full_usage "\n\n"
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111 | //usage: "Listen for incoming HTTP requests\n"
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112 | //usage: "\n -i Inetd mode"
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113 | //usage: "\n -f Don't daemonize"
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114 | //usage: "\n -v[v] Verbose"
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115 | //usage: "\n -p [IP:]PORT Bind to IP:PORT (default *:80)"
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116 | //usage: IF_FEATURE_HTTPD_SETUID(
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117 | //usage: "\n -u USER[:GRP] Set uid/gid after binding to port")
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118 | //usage: IF_FEATURE_HTTPD_BASIC_AUTH(
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119 | //usage: "\n -r REALM Authentication Realm for Basic Authentication")
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120 | //usage: "\n -h HOME Home directory (default .)"
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121 | //usage: "\n -c FILE Configuration file (default {/etc,HOME}/httpd.conf)"
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122 | //usage: IF_FEATURE_HTTPD_AUTH_MD5(
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123 | //usage: "\n -m STRING MD5 crypt STRING")
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124 | //usage: "\n -e STRING HTML encode STRING"
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125 | //usage: "\n -d STRING URL decode STRING"
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126 |
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127 | #include "libbb.h"
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128 | #include "common_bufsiz.h"
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129 | #if ENABLE_PAM
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130 | /* PAM may include <locale.h>. We may need to undefine bbox's stub define: */
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131 | # undef setlocale
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132 | /* For some obscure reason, PAM is not in pam/xxx, but in security/xxx.
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133 | * Apparently they like to confuse people. */
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134 | # include <security/pam_appl.h>
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135 | # include <security/pam_misc.h>
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136 | #endif
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137 | #if ENABLE_FEATURE_USE_SENDFILE
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138 | # include <sys/sendfile.h>
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139 | #endif
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140 | /* amount of buffering in a pipe */
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141 | #ifndef PIPE_BUF
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142 | # define PIPE_BUF 4096
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143 | #endif
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144 |
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145 | #define DEBUG 0
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146 |
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147 | #define IOBUF_SIZE 8192
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148 | #if PIPE_BUF >= IOBUF_SIZE
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149 | # error "PIPE_BUF >= IOBUF_SIZE"
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150 | #endif
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151 |
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152 | #define HEADER_READ_TIMEOUT 60
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153 |
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154 | static const char DEFAULT_PATH_HTTPD_CONF[] ALIGN1 = "/etc";
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155 | static const char HTTPD_CONF[] ALIGN1 = "httpd.conf";
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156 | static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
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157 | static const char index_html[] ALIGN1 = "index.html";
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158 |
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159 | typedef struct has_next_ptr {
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160 | struct has_next_ptr *next;
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161 | } has_next_ptr;
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162 |
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163 | /* Must have "next" as a first member */
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164 | typedef struct Htaccess {
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165 | struct Htaccess *next;
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166 | char *after_colon;
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167 | char before_colon[1]; /* really bigger, must be last */
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168 | } Htaccess;
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169 |
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170 | /* Must have "next" as a first member */
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171 | typedef struct Htaccess_IP {
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172 | struct Htaccess_IP *next;
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173 | unsigned ip;
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174 | unsigned mask;
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175 | int allow_deny;
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176 | } Htaccess_IP;
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177 |
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178 | /* Must have "next" as a first member */
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179 | typedef struct Htaccess_Proxy {
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180 | struct Htaccess_Proxy *next;
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181 | char *url_from;
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182 | char *host_port;
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183 | char *url_to;
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184 | } Htaccess_Proxy;
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185 |
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186 | enum {
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187 | HTTP_OK = 200,
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188 | HTTP_PARTIAL_CONTENT = 206,
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189 | HTTP_MOVED_TEMPORARILY = 302,
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190 | HTTP_BAD_REQUEST = 400, /* malformed syntax */
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191 | HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
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192 | HTTP_NOT_FOUND = 404,
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193 | HTTP_FORBIDDEN = 403,
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194 | HTTP_REQUEST_TIMEOUT = 408,
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195 | HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */
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196 | HTTP_INTERNAL_SERVER_ERROR = 500,
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197 | HTTP_CONTINUE = 100,
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198 | #if 0 /* future use */
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199 | HTTP_SWITCHING_PROTOCOLS = 101,
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200 | HTTP_CREATED = 201,
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201 | HTTP_ACCEPTED = 202,
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202 | HTTP_NON_AUTHORITATIVE_INFO = 203,
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203 | HTTP_NO_CONTENT = 204,
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204 | HTTP_MULTIPLE_CHOICES = 300,
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205 | HTTP_MOVED_PERMANENTLY = 301,
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206 | HTTP_NOT_MODIFIED = 304,
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207 | HTTP_PAYMENT_REQUIRED = 402,
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208 | HTTP_BAD_GATEWAY = 502,
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209 | HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
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210 | #endif
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211 | };
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212 |
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213 | static const uint16_t http_response_type[] ALIGN2 = {
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214 | HTTP_OK,
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215 | #if ENABLE_FEATURE_HTTPD_RANGES
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216 | HTTP_PARTIAL_CONTENT,
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217 | #endif
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218 | HTTP_MOVED_TEMPORARILY,
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219 | HTTP_REQUEST_TIMEOUT,
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220 | HTTP_NOT_IMPLEMENTED,
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221 | #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
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222 | HTTP_UNAUTHORIZED,
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223 | #endif
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224 | HTTP_NOT_FOUND,
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225 | HTTP_BAD_REQUEST,
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226 | HTTP_FORBIDDEN,
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227 | HTTP_INTERNAL_SERVER_ERROR,
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228 | #if 0 /* not implemented */
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229 | HTTP_CREATED,
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230 | HTTP_ACCEPTED,
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231 | HTTP_NO_CONTENT,
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232 | HTTP_MULTIPLE_CHOICES,
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233 | HTTP_MOVED_PERMANENTLY,
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234 | HTTP_NOT_MODIFIED,
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235 | HTTP_BAD_GATEWAY,
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236 | HTTP_SERVICE_UNAVAILABLE,
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237 | #endif
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238 | };
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239 |
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240 | static const struct {
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241 | const char *name;
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242 | const char *info;
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243 | } http_response[ARRAY_SIZE(http_response_type)] = {
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244 | { "OK", NULL },
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245 | #if ENABLE_FEATURE_HTTPD_RANGES
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246 | { "Partial Content", NULL },
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247 | #endif
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248 | { "Found", NULL },
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249 | { "Request Timeout", "No request appeared within 60 seconds" },
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250 | { "Not Implemented", "The requested method is not recognized" },
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251 | #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
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252 | { "Unauthorized", "" },
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253 | #endif
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254 | { "Not Found", "The requested URL was not found" },
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255 | { "Bad Request", "Unsupported method" },
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256 | { "Forbidden", "" },
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257 | { "Internal Server Error", "Internal Server Error" },
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258 | #if 0 /* not implemented */
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259 | { "Created" },
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260 | { "Accepted" },
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261 | { "No Content" },
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262 | { "Multiple Choices" },
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263 | { "Moved Permanently" },
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264 | { "Not Modified" },
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265 | { "Bad Gateway", "" },
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266 | { "Service Unavailable", "" },
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267 | #endif
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268 | };
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269 |
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270 | struct globals {
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271 | int verbose; /* must be int (used by getopt32) */
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272 | smallint flg_deny_all;
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273 |
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274 | unsigned rmt_ip; /* used for IP-based allow/deny rules */
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275 | time_t last_mod;
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276 | char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */
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277 | const char *bind_addr_or_port;
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278 |
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279 | const char *g_query;
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280 | const char *opt_c_configFile;
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281 | const char *home_httpd;
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282 | const char *index_page;
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283 |
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284 | const char *found_mime_type;
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285 | const char *found_moved_temporarily;
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286 | Htaccess_IP *ip_a_d; /* config allow/deny lines */
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287 |
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288 | IF_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
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289 | IF_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
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290 | IF_FEATURE_HTTPD_CGI(char *referer;)
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291 | IF_FEATURE_HTTPD_CGI(char *user_agent;)
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292 | IF_FEATURE_HTTPD_CGI(char *host;)
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293 | IF_FEATURE_HTTPD_CGI(char *http_accept;)
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294 | IF_FEATURE_HTTPD_CGI(char *http_accept_language;)
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295 |
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296 | off_t file_size; /* -1 - unknown */
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297 | #if ENABLE_FEATURE_HTTPD_RANGES
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298 | off_t range_start;
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299 | off_t range_end;
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300 | off_t range_len;
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301 | #endif
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302 |
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303 | #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
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304 | Htaccess *g_auth; /* config user:password lines */
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305 | #endif
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306 | Htaccess *mime_a; /* config mime types */
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307 | #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
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308 | Htaccess *script_i; /* config script interpreters */
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309 | #endif
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310 | char *iobuf; /* [IOBUF_SIZE] */
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311 | #define hdr_buf bb_common_bufsiz1
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312 | #define sizeof_hdr_buf COMMON_BUFSIZE
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313 | char *hdr_ptr;
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314 | int hdr_cnt;
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315 | #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
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316 | const char *http_error_page[ARRAY_SIZE(http_response_type)];
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317 | #endif
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318 | #if ENABLE_FEATURE_HTTPD_PROXY
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319 | Htaccess_Proxy *proxy;
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320 | #endif
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321 | #if ENABLE_FEATURE_HTTPD_GZIP
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322 | /* client can handle gzip / we are going to send gzip */
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323 | smallint content_gzip;
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324 | #endif
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325 | };
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326 | #define G (*ptr_to_globals)
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327 | #define verbose (G.verbose )
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328 | #define flg_deny_all (G.flg_deny_all )
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329 | #define rmt_ip (G.rmt_ip )
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330 | #define bind_addr_or_port (G.bind_addr_or_port)
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331 | #define g_query (G.g_query )
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332 | #define opt_c_configFile (G.opt_c_configFile )
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333 | #define home_httpd (G.home_httpd )
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334 | #define index_page (G.index_page )
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335 | #define found_mime_type (G.found_mime_type )
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336 | #define found_moved_temporarily (G.found_moved_temporarily)
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337 | #define last_mod (G.last_mod )
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338 | #define ip_a_d (G.ip_a_d )
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339 | #define g_realm (G.g_realm )
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340 | #define remoteuser (G.remoteuser )
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341 | #define referer (G.referer )
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342 | #define user_agent (G.user_agent )
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343 | #define host (G.host )
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344 | #define http_accept (G.http_accept )
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345 | #define http_accept_language (G.http_accept_language)
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346 | #define file_size (G.file_size )
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347 | #if ENABLE_FEATURE_HTTPD_RANGES
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348 | #define range_start (G.range_start )
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349 | #define range_end (G.range_end )
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350 | #define range_len (G.range_len )
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351 | #else
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352 | enum {
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353 | range_start = -1,
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354 | range_end = MAXINT(off_t) - 1,
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355 | range_len = MAXINT(off_t),
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356 | };
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357 | #endif
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358 | #define rmt_ip_str (G.rmt_ip_str )
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359 | #define g_auth (G.g_auth )
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360 | #define mime_a (G.mime_a )
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361 | #define script_i (G.script_i )
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362 | #define iobuf (G.iobuf )
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363 | #define hdr_ptr (G.hdr_ptr )
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364 | #define hdr_cnt (G.hdr_cnt )
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365 | #define http_error_page (G.http_error_page )
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366 | #define proxy (G.proxy )
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367 | #if ENABLE_FEATURE_HTTPD_GZIP
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368 | # define content_gzip (G.content_gzip )
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369 | #else
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370 | # define content_gzip 0
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371 | #endif
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372 | #define INIT_G() do { \
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373 | setup_common_bufsiz(); \
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374 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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375 | IF_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
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376 | IF_FEATURE_HTTPD_RANGES(range_start = -1;) \
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377 | bind_addr_or_port = "80"; \
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378 | index_page = index_html; \
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379 | file_size = -1; \
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380 | } while (0)
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381 |
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382 |
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383 | #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
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384 |
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385 | /* Prototypes */
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386 | enum {
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387 | SEND_HEADERS = (1 << 0),
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388 | SEND_BODY = (1 << 1),
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389 | SEND_HEADERS_AND_BODY = SEND_HEADERS + SEND_BODY,
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390 | };
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391 | static void send_file_and_exit(const char *url, int what) NORETURN;
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392 |
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393 | static void free_llist(has_next_ptr **pptr)
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394 | {
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395 | has_next_ptr *cur = *pptr;
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396 | while (cur) {
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397 | has_next_ptr *t = cur;
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398 | cur = cur->next;
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399 | free(t);
|
---|
400 | }
|
---|
401 | *pptr = NULL;
|
---|
402 | }
|
---|
403 |
|
---|
404 | static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
|
---|
405 | {
|
---|
406 | free_llist((has_next_ptr**)pptr);
|
---|
407 | }
|
---|
408 |
|
---|
409 | static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
|
---|
410 | {
|
---|
411 | free_llist((has_next_ptr**)pptr);
|
---|
412 | }
|
---|
413 |
|
---|
414 | /* Returns presumed mask width in bits or < 0 on error.
|
---|
415 | * Updates strp, stores IP at provided pointer */
|
---|
416 | static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
|
---|
417 | {
|
---|
418 | const char *p = *strp;
|
---|
419 | int auto_mask = 8;
|
---|
420 | unsigned ip = 0;
|
---|
421 | int j;
|
---|
422 |
|
---|
423 | if (*p == '/')
|
---|
424 | return -auto_mask;
|
---|
425 |
|
---|
426 | for (j = 0; j < 4; j++) {
|
---|
427 | unsigned octet;
|
---|
428 |
|
---|
429 | if ((*p < '0' || *p > '9') && *p != '/' && *p)
|
---|
430 | return -auto_mask;
|
---|
431 | octet = 0;
|
---|
432 | while (*p >= '0' && *p <= '9') {
|
---|
433 | octet *= 10;
|
---|
434 | octet += *p - '0';
|
---|
435 | if (octet > 255)
|
---|
436 | return -auto_mask;
|
---|
437 | p++;
|
---|
438 | }
|
---|
439 | if (*p == '.')
|
---|
440 | p++;
|
---|
441 | if (*p != '/' && *p)
|
---|
442 | auto_mask += 8;
|
---|
443 | ip = (ip << 8) | octet;
|
---|
444 | }
|
---|
445 | if (*p) {
|
---|
446 | if (*p != endc)
|
---|
447 | return -auto_mask;
|
---|
448 | p++;
|
---|
449 | if (*p == '\0')
|
---|
450 | return -auto_mask;
|
---|
451 | }
|
---|
452 | *ipp = ip;
|
---|
453 | *strp = p;
|
---|
454 | return auto_mask;
|
---|
455 | }
|
---|
456 |
|
---|
457 | /* Returns 0 on success. Stores IP and mask at provided pointers */
|
---|
458 | static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
|
---|
459 | {
|
---|
460 | int i;
|
---|
461 | unsigned mask;
|
---|
462 | char *p;
|
---|
463 |
|
---|
464 | i = scan_ip(&str, ipp, '/');
|
---|
465 | if (i < 0)
|
---|
466 | return i;
|
---|
467 |
|
---|
468 | if (*str) {
|
---|
469 | /* there is /xxx after dotted-IP address */
|
---|
470 | i = bb_strtou(str, &p, 10);
|
---|
471 | if (*p == '.') {
|
---|
472 | /* 'xxx' itself is dotted-IP mask, parse it */
|
---|
473 | /* (return 0 (success) only if it has N.N.N.N form) */
|
---|
474 | return scan_ip(&str, maskp, '\0') - 32;
|
---|
475 | }
|
---|
476 | if (*p)
|
---|
477 | return -1;
|
---|
478 | }
|
---|
479 |
|
---|
480 | if (i > 32)
|
---|
481 | return -1;
|
---|
482 |
|
---|
483 | if (sizeof(unsigned) == 4 && i == 32) {
|
---|
484 | /* mask >>= 32 below may not work */
|
---|
485 | mask = 0;
|
---|
486 | } else {
|
---|
487 | mask = 0xffffffff;
|
---|
488 | mask >>= i;
|
---|
489 | }
|
---|
490 | /* i == 0 -> *maskp = 0x00000000
|
---|
491 | * i == 1 -> *maskp = 0x80000000
|
---|
492 | * i == 4 -> *maskp = 0xf0000000
|
---|
493 | * i == 31 -> *maskp = 0xfffffffe
|
---|
494 | * i == 32 -> *maskp = 0xffffffff */
|
---|
495 | *maskp = (uint32_t)(~mask);
|
---|
496 | return 0;
|
---|
497 | }
|
---|
498 |
|
---|
499 | /*
|
---|
500 | * Parse configuration file into in-memory linked list.
|
---|
501 | *
|
---|
502 | * Any previous IP rules are discarded.
|
---|
503 | * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
|
---|
504 | * are also discarded. That is, previous settings are retained if flag is
|
---|
505 | * SUBDIR_PARSE.
|
---|
506 | * Error pages are only parsed on the main config file.
|
---|
507 | *
|
---|
508 | * path Path where to look for httpd.conf (without filename).
|
---|
509 | * flag Type of the parse request.
|
---|
510 | */
|
---|
511 | /* flag param: */
|
---|
512 | enum {
|
---|
513 | FIRST_PARSE = 0, /* path will be "/etc" */
|
---|
514 | SIGNALED_PARSE = 1, /* path will be "/etc" */
|
---|
515 | SUBDIR_PARSE = 2, /* path will be derived from URL */
|
---|
516 | };
|
---|
517 | static void parse_conf(const char *path, int flag)
|
---|
518 | {
|
---|
519 | /* internally used extra flag state */
|
---|
520 | enum { TRY_CURDIR_PARSE = 3 };
|
---|
521 |
|
---|
522 | FILE *f;
|
---|
523 | const char *filename;
|
---|
524 | char buf[160];
|
---|
525 |
|
---|
526 | /* discard old rules */
|
---|
527 | free_Htaccess_IP_list(&ip_a_d);
|
---|
528 | flg_deny_all = 0;
|
---|
529 | /* retain previous auth and mime config only for subdir parse */
|
---|
530 | if (flag != SUBDIR_PARSE) {
|
---|
531 | free_Htaccess_list(&mime_a);
|
---|
532 | #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
|
---|
533 | free_Htaccess_list(&g_auth);
|
---|
534 | #endif
|
---|
535 | #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
|
---|
536 | free_Htaccess_list(&script_i);
|
---|
537 | #endif
|
---|
538 | }
|
---|
539 |
|
---|
540 | filename = opt_c_configFile;
|
---|
541 | if (flag == SUBDIR_PARSE || filename == NULL) {
|
---|
542 | filename = alloca(strlen(path) + sizeof(HTTPD_CONF) + 2);
|
---|
543 | sprintf((char *)filename, "%s/%s", path, HTTPD_CONF);
|
---|
544 | }
|
---|
545 |
|
---|
546 | while ((f = fopen_for_read(filename)) == NULL) {
|
---|
547 | if (flag >= SUBDIR_PARSE) { /* SUBDIR or TRY_CURDIR */
|
---|
548 | /* config file not found, no changes to config */
|
---|
549 | return;
|
---|
550 | }
|
---|
551 | if (flag == FIRST_PARSE) {
|
---|
552 | /* -c CONFFILE given, but CONFFILE doesn't exist? */
|
---|
553 | if (opt_c_configFile)
|
---|
554 | bb_simple_perror_msg_and_die(opt_c_configFile);
|
---|
555 | /* else: no -c, thus we looked at /etc/httpd.conf,
|
---|
556 | * and it's not there. try ./httpd.conf: */
|
---|
557 | }
|
---|
558 | flag = TRY_CURDIR_PARSE;
|
---|
559 | filename = HTTPD_CONF;
|
---|
560 | }
|
---|
561 |
|
---|
562 | #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
|
---|
563 | /* in "/file:user:pass" lines, we prepend path in subdirs */
|
---|
564 | if (flag != SUBDIR_PARSE)
|
---|
565 | path = "";
|
---|
566 | #endif
|
---|
567 | /* The lines can be:
|
---|
568 | *
|
---|
569 | * I:default_index_file
|
---|
570 | * H:http_home
|
---|
571 | * [AD]:IP[/mask] # allow/deny, * for wildcard
|
---|
572 | * Ennn:error.html # error page for status nnn
|
---|
573 | * P:/url:[http://]hostname[:port]/new/path # reverse proxy
|
---|
574 | * .ext:mime/type # mime type
|
---|
575 | * *.php:/path/php # run xxx.php through an interpreter
|
---|
576 | * /file:user:pass # username and password
|
---|
577 | */
|
---|
578 | while (fgets(buf, sizeof(buf), f) != NULL) {
|
---|
579 | unsigned strlen_buf;
|
---|
580 | unsigned char ch;
|
---|
581 | char *after_colon;
|
---|
582 |
|
---|
583 | { /* remove all whitespace, and # comments */
|
---|
584 | char *p, *p0;
|
---|
585 |
|
---|
586 | p0 = buf;
|
---|
587 | /* skip non-whitespace beginning. Often the whole line
|
---|
588 | * is non-whitespace. We want this case to work fast,
|
---|
589 | * without needless copying, therefore we don't merge
|
---|
590 | * this operation into next while loop. */
|
---|
591 | while ((ch = *p0) != '\0' && ch != '\n' && ch != '#'
|
---|
592 | && ch != ' ' && ch != '\t'
|
---|
593 | ) {
|
---|
594 | p0++;
|
---|
595 | }
|
---|
596 | p = p0;
|
---|
597 | /* if we enter this loop, we have some whitespace.
|
---|
598 | * discard it */
|
---|
599 | while (ch != '\0' && ch != '\n' && ch != '#') {
|
---|
600 | if (ch != ' ' && ch != '\t') {
|
---|
601 | *p++ = ch;
|
---|
602 | }
|
---|
603 | ch = *++p0;
|
---|
604 | }
|
---|
605 | *p = '\0';
|
---|
606 | strlen_buf = p - buf;
|
---|
607 | if (strlen_buf == 0)
|
---|
608 | continue; /* empty line */
|
---|
609 | }
|
---|
610 |
|
---|
611 | after_colon = strchr(buf, ':');
|
---|
612 | /* strange line? */
|
---|
613 | if (after_colon == NULL || *++after_colon == '\0')
|
---|
614 | goto config_error;
|
---|
615 |
|
---|
616 | ch = (buf[0] & ~0x20); /* toupper if it's a letter */
|
---|
617 |
|
---|
618 | if (ch == 'I') {
|
---|
619 | if (index_page != index_html)
|
---|
620 | free((char*)index_page);
|
---|
621 | index_page = xstrdup(after_colon);
|
---|
622 | continue;
|
---|
623 | }
|
---|
624 |
|
---|
625 | /* do not allow jumping around using H in subdir's configs */
|
---|
626 | if (flag == FIRST_PARSE && ch == 'H') {
|
---|
627 | home_httpd = xstrdup(after_colon);
|
---|
628 | xchdir(home_httpd);
|
---|
629 | continue;
|
---|
630 | }
|
---|
631 |
|
---|
632 | if (ch == 'A' || ch == 'D') {
|
---|
633 | Htaccess_IP *pip;
|
---|
634 |
|
---|
635 | if (*after_colon == '*') {
|
---|
636 | if (ch == 'D') {
|
---|
637 | /* memorize "deny all" */
|
---|
638 | flg_deny_all = 1;
|
---|
639 | }
|
---|
640 | /* skip assumed "A:*", it is a default anyway */
|
---|
641 | continue;
|
---|
642 | }
|
---|
643 | /* store "allow/deny IP/mask" line */
|
---|
644 | pip = xzalloc(sizeof(*pip));
|
---|
645 | if (scan_ip_mask(after_colon, &pip->ip, &pip->mask)) {
|
---|
646 | /* IP{/mask} syntax error detected, protect all */
|
---|
647 | ch = 'D';
|
---|
648 | pip->mask = 0;
|
---|
649 | }
|
---|
650 | pip->allow_deny = ch;
|
---|
651 | if (ch == 'D') {
|
---|
652 | /* Deny:from_IP - prepend */
|
---|
653 | pip->next = ip_a_d;
|
---|
654 | ip_a_d = pip;
|
---|
655 | } else {
|
---|
656 | /* A:from_IP - append (thus all D's precedes A's) */
|
---|
657 | Htaccess_IP *prev_IP = ip_a_d;
|
---|
658 | if (prev_IP == NULL) {
|
---|
659 | ip_a_d = pip;
|
---|
660 | } else {
|
---|
661 | while (prev_IP->next)
|
---|
662 | prev_IP = prev_IP->next;
|
---|
663 | prev_IP->next = pip;
|
---|
664 | }
|
---|
665 | }
|
---|
666 | continue;
|
---|
667 | }
|
---|
668 |
|
---|
669 | #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
|
---|
670 | if (flag == FIRST_PARSE && ch == 'E') {
|
---|
671 | unsigned i;
|
---|
672 | int status = atoi(buf + 1); /* error status code */
|
---|
673 |
|
---|
674 | if (status < HTTP_CONTINUE) {
|
---|
675 | goto config_error;
|
---|
676 | }
|
---|
677 | /* then error page; find matching status */
|
---|
678 | for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
|
---|
679 | if (http_response_type[i] == status) {
|
---|
680 | /* We chdir to home_httpd, thus no need to
|
---|
681 | * concat_path_file(home_httpd, after_colon)
|
---|
682 | * here */
|
---|
683 | http_error_page[i] = xstrdup(after_colon);
|
---|
684 | break;
|
---|
685 | }
|
---|
686 | }
|
---|
687 | continue;
|
---|
688 | }
|
---|
689 | #endif
|
---|
690 |
|
---|
691 | #if ENABLE_FEATURE_HTTPD_PROXY
|
---|
692 | if (flag == FIRST_PARSE && ch == 'P') {
|
---|
693 | /* P:/url:[http://]hostname[:port]/new/path */
|
---|
694 | char *url_from, *host_port, *url_to;
|
---|
695 | Htaccess_Proxy *proxy_entry;
|
---|
696 |
|
---|
697 | url_from = after_colon;
|
---|
698 | host_port = strchr(after_colon, ':');
|
---|
699 | if (host_port == NULL) {
|
---|
700 | goto config_error;
|
---|
701 | }
|
---|
702 | *host_port++ = '\0';
|
---|
703 | if (is_prefixed_with(host_port, "http://"))
|
---|
704 | host_port += 7;
|
---|
705 | if (*host_port == '\0') {
|
---|
706 | goto config_error;
|
---|
707 | }
|
---|
708 | url_to = strchr(host_port, '/');
|
---|
709 | if (url_to == NULL) {
|
---|
710 | goto config_error;
|
---|
711 | }
|
---|
712 | *url_to = '\0';
|
---|
713 | proxy_entry = xzalloc(sizeof(*proxy_entry));
|
---|
714 | proxy_entry->url_from = xstrdup(url_from);
|
---|
715 | proxy_entry->host_port = xstrdup(host_port);
|
---|
716 | *url_to = '/';
|
---|
717 | proxy_entry->url_to = xstrdup(url_to);
|
---|
718 | proxy_entry->next = proxy;
|
---|
719 | proxy = proxy_entry;
|
---|
720 | continue;
|
---|
721 | }
|
---|
722 | #endif
|
---|
723 | /* the rest of directives are non-alphabetic,
|
---|
724 | * must avoid using "toupper'ed" ch */
|
---|
725 | ch = buf[0];
|
---|
726 |
|
---|
727 | if (ch == '.' /* ".ext:mime/type" */
|
---|
728 | #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
|
---|
729 | || (ch == '*' && buf[1] == '.') /* "*.php:/path/php" */
|
---|
730 | #endif
|
---|
731 | ) {
|
---|
732 | char *p;
|
---|
733 | Htaccess *cur;
|
---|
734 |
|
---|
735 | cur = xzalloc(sizeof(*cur) /* includes space for NUL */ + strlen_buf);
|
---|
736 | strcpy(cur->before_colon, buf);
|
---|
737 | p = cur->before_colon + (after_colon - buf);
|
---|
738 | p[-1] = '\0';
|
---|
739 | cur->after_colon = p;
|
---|
740 | if (ch == '.') {
|
---|
741 | /* .mime line: prepend to mime_a list */
|
---|
742 | cur->next = mime_a;
|
---|
743 | mime_a = cur;
|
---|
744 | }
|
---|
745 | #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
|
---|
746 | else {
|
---|
747 | /* script interpreter line: prepend to script_i list */
|
---|
748 | cur->next = script_i;
|
---|
749 | script_i = cur;
|
---|
750 | }
|
---|
751 | #endif
|
---|
752 | continue;
|
---|
753 | }
|
---|
754 |
|
---|
755 | #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
|
---|
756 | if (ch == '/') { /* "/file:user:pass" */
|
---|
757 | char *p;
|
---|
758 | Htaccess *cur;
|
---|
759 | unsigned file_len;
|
---|
760 |
|
---|
761 | /* note: path is "" unless we are in SUBDIR parse,
|
---|
762 | * otherwise it does NOT start with "/" */
|
---|
763 | cur = xzalloc(sizeof(*cur) /* includes space for NUL */
|
---|
764 | + 1 + strlen(path)
|
---|
765 | + strlen_buf
|
---|
766 | );
|
---|
767 | /* form "/path/file" */
|
---|
768 | sprintf(cur->before_colon, "/%s%.*s",
|
---|
769 | path,
|
---|
770 | (int) (after_colon - buf - 1), /* includes "/", but not ":" */
|
---|
771 | buf);
|
---|
772 | /* canonicalize it */
|
---|
773 | p = bb_simplify_abs_path_inplace(cur->before_colon);
|
---|
774 | file_len = p - cur->before_colon;
|
---|
775 | /* add "user:pass" after NUL */
|
---|
776 | strcpy(++p, after_colon);
|
---|
777 | cur->after_colon = p;
|
---|
778 |
|
---|
779 | /* insert cur into g_auth */
|
---|
780 | /* g_auth is sorted by decreased filename length */
|
---|
781 | {
|
---|
782 | Htaccess *auth, **authp;
|
---|
783 |
|
---|
784 | authp = &g_auth;
|
---|
785 | while ((auth = *authp) != NULL) {
|
---|
786 | if (file_len >= strlen(auth->before_colon)) {
|
---|
787 | /* insert cur before auth */
|
---|
788 | cur->next = auth;
|
---|
789 | break;
|
---|
790 | }
|
---|
791 | authp = &auth->next;
|
---|
792 | }
|
---|
793 | *authp = cur;
|
---|
794 | }
|
---|
795 | continue;
|
---|
796 | }
|
---|
797 | #endif /* BASIC_AUTH */
|
---|
798 |
|
---|
799 | /* the line is not recognized */
|
---|
800 | config_error:
|
---|
801 | bb_error_msg("config error '%s' in '%s'", buf, filename);
|
---|
802 | } /* while (fgets) */
|
---|
803 |
|
---|
804 | fclose(f);
|
---|
805 | }
|
---|
806 |
|
---|
807 | #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
|
---|
808 | /*
|
---|
809 | * Given a string, html-encode special characters.
|
---|
810 | * This is used for the -e command line option to provide an easy way
|
---|
811 | * for scripts to encode result data without confusing browsers. The
|
---|
812 | * returned string pointer is memory allocated by malloc().
|
---|
813 | *
|
---|
814 | * Returns a pointer to the encoded string (malloced).
|
---|
815 | */
|
---|
816 | static char *encodeString(const char *string)
|
---|
817 | {
|
---|
818 | /* take the simple route and encode everything */
|
---|
819 | /* could possibly scan once to get length. */
|
---|
820 | int len = strlen(string);
|
---|
821 | char *out = xmalloc(len * 6 + 1);
|
---|
822 | char *p = out;
|
---|
823 | char ch;
|
---|
824 |
|
---|
825 | while ((ch = *string++) != '\0') {
|
---|
826 | /* very simple check for what to encode */
|
---|
827 | if (isalnum(ch))
|
---|
828 | *p++ = ch;
|
---|
829 | else
|
---|
830 | p += sprintf(p, "&#%d;", (unsigned char) ch);
|
---|
831 | }
|
---|
832 | *p = '\0';
|
---|
833 | return out;
|
---|
834 | }
|
---|
835 | #endif
|
---|
836 |
|
---|
837 | #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
|
---|
838 | /*
|
---|
839 | * Decode a base64 data stream as per rfc1521.
|
---|
840 | * Note that the rfc states that non base64 chars are to be ignored.
|
---|
841 | * Since the decode always results in a shorter size than the input,
|
---|
842 | * it is OK to pass the input arg as an output arg.
|
---|
843 | * Parameter: a pointer to a base64 encoded string.
|
---|
844 | * Decoded data is stored in-place.
|
---|
845 | */
|
---|
846 | static void decodeBase64(char *Data)
|
---|
847 | {
|
---|
848 | const unsigned char *in = (const unsigned char *)Data;
|
---|
849 | /* The decoded size will be at most 3/4 the size of the encoded */
|
---|
850 | unsigned ch = 0;
|
---|
851 | int i = 0;
|
---|
852 |
|
---|
853 | while (*in) {
|
---|
854 | int t = *in++;
|
---|
855 |
|
---|
856 | if (t >= '0' && t <= '9')
|
---|
857 | t = t - '0' + 52;
|
---|
858 | else if (t >= 'A' && t <= 'Z')
|
---|
859 | t = t - 'A';
|
---|
860 | else if (t >= 'a' && t <= 'z')
|
---|
861 | t = t - 'a' + 26;
|
---|
862 | else if (t == '+')
|
---|
863 | t = 62;
|
---|
864 | else if (t == '/')
|
---|
865 | t = 63;
|
---|
866 | else if (t == '=')
|
---|
867 | t = 0;
|
---|
868 | else
|
---|
869 | continue;
|
---|
870 |
|
---|
871 | ch = (ch << 6) | t;
|
---|
872 | i++;
|
---|
873 | if (i == 4) {
|
---|
874 | *Data++ = (char) (ch >> 16);
|
---|
875 | *Data++ = (char) (ch >> 8);
|
---|
876 | *Data++ = (char) ch;
|
---|
877 | i = 0;
|
---|
878 | }
|
---|
879 | }
|
---|
880 | *Data = '\0';
|
---|
881 | }
|
---|
882 | #endif
|
---|
883 |
|
---|
884 | /*
|
---|
885 | * Create a listen server socket on the designated port.
|
---|
886 | */
|
---|
887 | static int openServer(void)
|
---|
888 | {
|
---|
889 | unsigned n = bb_strtou(bind_addr_or_port, NULL, 10);
|
---|
890 | if (!errno && n && n <= 0xffff)
|
---|
891 | n = create_and_bind_stream_or_die(NULL, n);
|
---|
892 | else
|
---|
893 | n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
|
---|
894 | xlisten(n, 9);
|
---|
895 | return n;
|
---|
896 | }
|
---|
897 |
|
---|
898 | /*
|
---|
899 | * Log the connection closure and exit.
|
---|
900 | */
|
---|
901 | static void log_and_exit(void) NORETURN;
|
---|
902 | static void log_and_exit(void)
|
---|
903 | {
|
---|
904 | /* Paranoia. IE said to be buggy. It may send some extra data
|
---|
905 | * or be confused by us just exiting without SHUT_WR. Oh well. */
|
---|
906 | shutdown(1, SHUT_WR);
|
---|
907 | /* Why??
|
---|
908 | (this also messes up stdin when user runs httpd -i from terminal)
|
---|
909 | ndelay_on(0);
|
---|
910 | while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0)
|
---|
911 | continue;
|
---|
912 | */
|
---|
913 |
|
---|
914 | if (verbose > 2)
|
---|
915 | bb_error_msg("closed");
|
---|
916 | _exit(xfunc_error_retval);
|
---|
917 | }
|
---|
918 |
|
---|
919 | /*
|
---|
920 | * Create and send HTTP response headers.
|
---|
921 | * The arguments are combined and sent as one write operation. Note that
|
---|
922 | * IE will puke big-time if the headers are not sent in one packet and the
|
---|
923 | * second packet is delayed for any reason.
|
---|
924 | * responseNum - the result code to send.
|
---|
925 | */
|
---|
926 | static void send_headers(int responseNum)
|
---|
927 | {
|
---|
928 | static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
|
---|
929 |
|
---|
930 | const char *responseString = "";
|
---|
931 | const char *infoString = NULL;
|
---|
932 | const char *mime_type;
|
---|
933 | #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
|
---|
934 | const char *error_page = NULL;
|
---|
935 | #endif
|
---|
936 | unsigned i;
|
---|
937 | time_t timer = time(NULL);
|
---|
938 | char tmp_str[80];
|
---|
939 | int len;
|
---|
940 |
|
---|
941 | for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
|
---|
942 | if (http_response_type[i] == responseNum) {
|
---|
943 | responseString = http_response[i].name;
|
---|
944 | infoString = http_response[i].info;
|
---|
945 | #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
|
---|
946 | error_page = http_error_page[i];
|
---|
947 | #endif
|
---|
948 | break;
|
---|
949 | }
|
---|
950 | }
|
---|
951 | /* error message is HTML */
|
---|
952 | mime_type = responseNum == HTTP_OK ?
|
---|
953 | found_mime_type : "text/html";
|
---|
954 |
|
---|
955 | if (verbose)
|
---|
956 | bb_error_msg("response:%u", responseNum);
|
---|
957 |
|
---|
958 | /* emit the current date */
|
---|
959 | strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
|
---|
960 | len = sprintf(iobuf,
|
---|
961 | "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
|
---|
962 | "Date: %s\r\nConnection: close\r\n",
|
---|
963 | responseNum, responseString, mime_type, tmp_str);
|
---|
964 |
|
---|
965 | #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
|
---|
966 | if (responseNum == HTTP_UNAUTHORIZED) {
|
---|
967 | len += sprintf(iobuf + len,
|
---|
968 | "WWW-Authenticate: Basic realm=\"%s\"\r\n",
|
---|
969 | g_realm);
|
---|
970 | }
|
---|
971 | #endif
|
---|
972 | if (responseNum == HTTP_MOVED_TEMPORARILY) {
|
---|
973 | /* Responding to "GET /dir" with
|
---|
974 | * "HTTP/1.0 302 Found" "Location: /dir/"
|
---|
975 | * - IOW, asking them to repeat with a slash.
|
---|
976 | * Here, overflow IS possible, can't use sprintf:
|
---|
977 | * mkdir test
|
---|
978 | * python -c 'print("get /test?" + ("x" * 8192))' | busybox httpd -i -h .
|
---|
979 | */
|
---|
980 | len += snprintf(iobuf + len, IOBUF_SIZE-3 - len,
|
---|
981 | "Location: %s/%s%s\r\n",
|
---|
982 | found_moved_temporarily,
|
---|
983 | (g_query ? "?" : ""),
|
---|
984 | (g_query ? g_query : ""));
|
---|
985 | if (len > IOBUF_SIZE-3)
|
---|
986 | len = IOBUF_SIZE-3;
|
---|
987 | }
|
---|
988 |
|
---|
989 | #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
|
---|
990 | if (error_page && access(error_page, R_OK) == 0) {
|
---|
991 | iobuf[len++] = '\r';
|
---|
992 | iobuf[len++] = '\n';
|
---|
993 | if (DEBUG) {
|
---|
994 | iobuf[len] = '\0';
|
---|
995 | fprintf(stderr, "headers: '%s'\n", iobuf);
|
---|
996 | }
|
---|
997 | full_write(STDOUT_FILENO, iobuf, len);
|
---|
998 | if (DEBUG)
|
---|
999 | fprintf(stderr, "writing error page: '%s'\n", error_page);
|
---|
1000 | return send_file_and_exit(error_page, SEND_BODY);
|
---|
1001 | }
|
---|
1002 | #endif
|
---|
1003 |
|
---|
1004 | if (file_size != -1) { /* file */
|
---|
1005 | strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
|
---|
1006 | #if ENABLE_FEATURE_HTTPD_RANGES
|
---|
1007 | if (responseNum == HTTP_PARTIAL_CONTENT) {
|
---|
1008 | len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"u-%"OFF_FMT"u/%"OFF_FMT"u\r\n",
|
---|
1009 | range_start,
|
---|
1010 | range_end,
|
---|
1011 | file_size);
|
---|
1012 | file_size = range_end - range_start + 1;
|
---|
1013 | }
|
---|
1014 | #endif
|
---|
1015 | len += sprintf(iobuf + len,
|
---|
1016 | #if ENABLE_FEATURE_HTTPD_RANGES
|
---|
1017 | "Accept-Ranges: bytes\r\n"
|
---|
1018 | #endif
|
---|
1019 | "Last-Modified: %s\r\n%s %"OFF_FMT"u\r\n",
|
---|
1020 | tmp_str,
|
---|
1021 | content_gzip ? "Transfer-length:" : "Content-length:",
|
---|
1022 | file_size
|
---|
1023 | );
|
---|
1024 | }
|
---|
1025 |
|
---|
1026 | if (content_gzip)
|
---|
1027 | len += sprintf(iobuf + len, "Content-Encoding: gzip\r\n");
|
---|
1028 |
|
---|
1029 | iobuf[len++] = '\r';
|
---|
1030 | iobuf[len++] = '\n';
|
---|
1031 | if (infoString) {
|
---|
1032 | len += sprintf(iobuf + len,
|
---|
1033 | "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
|
---|
1034 | "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
|
---|
1035 | responseNum, responseString,
|
---|
1036 | responseNum, responseString, infoString);
|
---|
1037 | }
|
---|
1038 | if (DEBUG) {
|
---|
1039 | iobuf[len] = '\0';
|
---|
1040 | fprintf(stderr, "headers: '%s'\n", iobuf);
|
---|
1041 | }
|
---|
1042 | if (full_write(STDOUT_FILENO, iobuf, len) != len) {
|
---|
1043 | if (verbose > 1)
|
---|
1044 | bb_perror_msg("error");
|
---|
1045 | log_and_exit();
|
---|
1046 | }
|
---|
1047 | }
|
---|
1048 |
|
---|
1049 | static void send_headers_and_exit(int responseNum) NORETURN;
|
---|
1050 | static void send_headers_and_exit(int responseNum)
|
---|
1051 | {
|
---|
1052 | IF_FEATURE_HTTPD_GZIP(content_gzip = 0;)
|
---|
1053 | send_headers(responseNum);
|
---|
1054 | log_and_exit();
|
---|
1055 | }
|
---|
1056 |
|
---|
1057 | /*
|
---|
1058 | * Read from the socket until '\n' or EOF. '\r' chars are removed.
|
---|
1059 | * '\n' is replaced with NUL.
|
---|
1060 | * Return number of characters read or 0 if nothing is read
|
---|
1061 | * ('\r' and '\n' are not counted).
|
---|
1062 | * Data is returned in iobuf.
|
---|
1063 | */
|
---|
1064 | static int get_line(void)
|
---|
1065 | {
|
---|
1066 | int count = 0;
|
---|
1067 | char c;
|
---|
1068 |
|
---|
1069 | alarm(HEADER_READ_TIMEOUT);
|
---|
1070 | while (1) {
|
---|
1071 | if (hdr_cnt <= 0) {
|
---|
1072 | hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof_hdr_buf);
|
---|
1073 | if (hdr_cnt <= 0)
|
---|
1074 | break;
|
---|
1075 | hdr_ptr = hdr_buf;
|
---|
1076 | }
|
---|
1077 | iobuf[count] = c = *hdr_ptr++;
|
---|
1078 | hdr_cnt--;
|
---|
1079 |
|
---|
1080 | if (c == '\r')
|
---|
1081 | continue;
|
---|
1082 | if (c == '\n') {
|
---|
1083 | iobuf[count] = '\0';
|
---|
1084 | break;
|
---|
1085 | }
|
---|
1086 | if (count < (IOBUF_SIZE - 1)) /* check overflow */
|
---|
1087 | count++;
|
---|
1088 | }
|
---|
1089 | return count;
|
---|
1090 | }
|
---|
1091 |
|
---|
1092 | #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
|
---|
1093 |
|
---|
1094 | /* gcc 4.2.1 fares better with NOINLINE */
|
---|
1095 | static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) NORETURN;
|
---|
1096 | static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
|
---|
1097 | {
|
---|
1098 | enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
|
---|
1099 | struct pollfd pfd[3];
|
---|
1100 | int out_cnt; /* we buffer a bit of initial CGI output */
|
---|
1101 | int count;
|
---|
1102 |
|
---|
1103 | /* iobuf is used for CGI -> network data,
|
---|
1104 | * hdr_buf is for network -> CGI data (POSTDATA) */
|
---|
1105 |
|
---|
1106 | /* If CGI dies, we still want to correctly finish reading its output
|
---|
1107 | * and send it to the peer. So please no SIGPIPEs! */
|
---|
1108 | signal(SIGPIPE, SIG_IGN);
|
---|
1109 |
|
---|
1110 | // We inconsistently handle a case when more POSTDATA from network
|
---|
1111 | // is coming than we expected. We may give *some part* of that
|
---|
1112 | // extra data to CGI.
|
---|
1113 |
|
---|
1114 | //if (hdr_cnt > post_len) {
|
---|
1115 | // /* We got more POSTDATA from network than we expected */
|
---|
1116 | // hdr_cnt = post_len;
|
---|
1117 | //}
|
---|
1118 | post_len -= hdr_cnt;
|
---|
1119 | /* post_len - number of POST bytes not yet read from network */
|
---|
1120 |
|
---|
1121 | /* NB: breaking out of this loop jumps to log_and_exit() */
|
---|
1122 | out_cnt = 0;
|
---|
1123 | pfd[FROM_CGI].fd = fromCgi_rd;
|
---|
1124 | pfd[FROM_CGI].events = POLLIN;
|
---|
1125 | pfd[TO_CGI].fd = toCgi_wr;
|
---|
1126 | while (1) {
|
---|
1127 | /* Note: even pfd[0].events == 0 won't prevent
|
---|
1128 | * revents == POLLHUP|POLLERR reports from closed stdin.
|
---|
1129 | * Setting fd to -1 works: */
|
---|
1130 | pfd[0].fd = -1;
|
---|
1131 | pfd[0].events = POLLIN;
|
---|
1132 | pfd[0].revents = 0; /* probably not needed, paranoia */
|
---|
1133 |
|
---|
1134 | /* We always poll this fd, thus kernel always sets revents: */
|
---|
1135 | /*pfd[FROM_CGI].events = POLLIN; - moved out of loop */
|
---|
1136 | /*pfd[FROM_CGI].revents = 0; - not needed */
|
---|
1137 |
|
---|
1138 | /* gcc-4.8.0 still doesnt fill two shorts with one insn :( */
|
---|
1139 | /* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47059 */
|
---|
1140 | /* hopefully one day it will... */
|
---|
1141 | pfd[TO_CGI].events = POLLOUT;
|
---|
1142 | pfd[TO_CGI].revents = 0; /* needed! */
|
---|
1143 |
|
---|
1144 | if (toCgi_wr && hdr_cnt <= 0) {
|
---|
1145 | if (post_len > 0) {
|
---|
1146 | /* Expect more POST data from network */
|
---|
1147 | pfd[0].fd = 0;
|
---|
1148 | } else {
|
---|
1149 | /* post_len <= 0 && hdr_cnt <= 0:
|
---|
1150 | * no more POST data to CGI,
|
---|
1151 | * let CGI see EOF on CGI's stdin */
|
---|
1152 | if (toCgi_wr != fromCgi_rd)
|
---|
1153 | close(toCgi_wr);
|
---|
1154 | toCgi_wr = 0;
|
---|
1155 | }
|
---|
1156 | }
|
---|
1157 |
|
---|
1158 | /* Now wait on the set of sockets */
|
---|
1159 | count = safe_poll(pfd, hdr_cnt > 0 ? TO_CGI+1 : FROM_CGI+1, -1);
|
---|
1160 | if (count <= 0) {
|
---|
1161 | #if 0
|
---|
1162 | if (safe_waitpid(pid, &status, WNOHANG) <= 0) {
|
---|
1163 | /* Weird. CGI didn't exit and no fd's
|
---|
1164 | * are ready, yet poll returned?! */
|
---|
1165 | continue;
|
---|
1166 | }
|
---|
1167 | if (DEBUG && WIFEXITED(status))
|
---|
1168 | bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
|
---|
1169 | if (DEBUG && WIFSIGNALED(status))
|
---|
1170 | bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
|
---|
1171 | #endif
|
---|
1172 | break;
|
---|
1173 | }
|
---|
1174 |
|
---|
1175 | if (pfd[TO_CGI].revents) {
|
---|
1176 | /* hdr_cnt > 0 here due to the way poll() called */
|
---|
1177 | /* Have data from peer and can write to CGI */
|
---|
1178 | count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
|
---|
1179 | /* Doesn't happen, we dont use nonblocking IO here
|
---|
1180 | *if (count < 0 && errno == EAGAIN) {
|
---|
1181 | * ...
|
---|
1182 | *} else */
|
---|
1183 | if (count > 0) {
|
---|
1184 | hdr_ptr += count;
|
---|
1185 | hdr_cnt -= count;
|
---|
1186 | } else {
|
---|
1187 | /* EOF/broken pipe to CGI, stop piping POST data */
|
---|
1188 | hdr_cnt = post_len = 0;
|
---|
1189 | }
|
---|
1190 | }
|
---|
1191 |
|
---|
1192 | if (pfd[0].revents) {
|
---|
1193 | /* post_len > 0 && hdr_cnt == 0 here */
|
---|
1194 | /* We expect data, prev data portion is eaten by CGI
|
---|
1195 | * and there *is* data to read from the peer
|
---|
1196 | * (POSTDATA) */
|
---|
1197 | //count = post_len > (int)sizeof_hdr_buf ? (int)sizeof_hdr_buf : post_len;
|
---|
1198 | //count = safe_read(STDIN_FILENO, hdr_buf, count);
|
---|
1199 | count = safe_read(STDIN_FILENO, hdr_buf, sizeof_hdr_buf);
|
---|
1200 | if (count > 0) {
|
---|
1201 | hdr_cnt = count;
|
---|
1202 | hdr_ptr = hdr_buf;
|
---|
1203 | post_len -= count;
|
---|
1204 | } else {
|
---|
1205 | /* no more POST data can be read */
|
---|
1206 | post_len = 0;
|
---|
1207 | }
|
---|
1208 | }
|
---|
1209 |
|
---|
1210 | if (pfd[FROM_CGI].revents) {
|
---|
1211 | /* There is something to read from CGI */
|
---|
1212 | char *rbuf = iobuf;
|
---|
1213 |
|
---|
1214 | /* Are we still buffering CGI output? */
|
---|
1215 | if (out_cnt >= 0) {
|
---|
1216 | /* HTTP_200[] has single "\r\n" at the end.
|
---|
1217 | * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
|
---|
1218 | * CGI scripts MUST send their own header terminated by
|
---|
1219 | * empty line, then data. That's why we have only one
|
---|
1220 | * <cr><lf> pair here. We will output "200 OK" line
|
---|
1221 | * if needed, but CGI still has to provide blank line
|
---|
1222 | * between header and body */
|
---|
1223 |
|
---|
1224 | /* Must use safe_read, not full_read, because
|
---|
1225 | * CGI may output a few first bytes and then wait
|
---|
1226 | * for POSTDATA without closing stdout.
|
---|
1227 | * With full_read we may wait here forever. */
|
---|
1228 | count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
|
---|
1229 | if (count <= 0) {
|
---|
1230 | /* eof (or error) and there was no "HTTP",
|
---|
1231 | * so write it, then write received data */
|
---|
1232 | if (out_cnt) {
|
---|
1233 | full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1);
|
---|
1234 | full_write(STDOUT_FILENO, rbuf, out_cnt);
|
---|
1235 | }
|
---|
1236 | break; /* CGI stdout is closed, exiting */
|
---|
1237 | }
|
---|
1238 | out_cnt += count;
|
---|
1239 | count = 0;
|
---|
1240 | /* "Status" header format is: "Status: 302 Redirected\r\n" */
|
---|
1241 | if (out_cnt >= 7 && memcmp(rbuf, "Status:", 7) == 0) {
|
---|
1242 | /* send "HTTP/1.0 " */
|
---|
1243 | if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9)
|
---|
1244 | break;
|
---|
1245 | rbuf += 7; /* skip "Status:" */
|
---|
1246 | count = out_cnt - 7;
|
---|
1247 | out_cnt = -1; /* buffering off */
|
---|
1248 | } else if (out_cnt >= 4) {
|
---|
1249 | /* Did CGI add "HTTP"? */
|
---|
1250 | if (memcmp(rbuf, HTTP_200, 4) != 0) {
|
---|
1251 | /* there is no "HTTP", do it ourself */
|
---|
1252 | if (full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
|
---|
1253 | break;
|
---|
1254 | }
|
---|
1255 | /* Commented out:
|
---|
1256 | if (!strstr(rbuf, "ontent-")) {
|
---|
1257 | full_write(s, "Content-type: text/plain\r\n\r\n", 28);
|
---|
1258 | }
|
---|
1259 | * Counter-example of valid CGI without Content-type:
|
---|
1260 | * echo -en "HTTP/1.0 302 Found\r\n"
|
---|
1261 | * echo -en "Location: http://www.busybox.net\r\n"
|
---|
1262 | * echo -en "\r\n"
|
---|
1263 | */
|
---|
1264 | count = out_cnt;
|
---|
1265 | out_cnt = -1; /* buffering off */
|
---|
1266 | }
|
---|
1267 | } else {
|
---|
1268 | count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
|
---|
1269 | if (count <= 0)
|
---|
1270 | break; /* eof (or error) */
|
---|
1271 | }
|
---|
1272 | if (full_write(STDOUT_FILENO, rbuf, count) != count)
|
---|
1273 | break;
|
---|
1274 | if (DEBUG)
|
---|
1275 | fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
|
---|
1276 | } /* if (pfd[FROM_CGI].revents) */
|
---|
1277 | } /* while (1) */
|
---|
1278 | log_and_exit();
|
---|
1279 | }
|
---|
1280 | #endif
|
---|
1281 |
|
---|
1282 | #if ENABLE_FEATURE_HTTPD_CGI
|
---|
1283 |
|
---|
1284 | static void setenv1(const char *name, const char *value)
|
---|
1285 | {
|
---|
1286 | setenv(name, value ? value : "", 1);
|
---|
1287 | }
|
---|
1288 |
|
---|
1289 | /*
|
---|
1290 | * Spawn CGI script, forward CGI's stdin/out <=> network
|
---|
1291 | *
|
---|
1292 | * Environment variables are set up and the script is invoked with pipes
|
---|
1293 | * for stdin/stdout. If a POST is being done the script is fed the POST
|
---|
1294 | * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
|
---|
1295 | *
|
---|
1296 | * Parameters:
|
---|
1297 | * const char *url The requested URL (with leading /).
|
---|
1298 | * const char *orig_uri The original URI before rewriting (if any)
|
---|
1299 | * int post_len Length of the POST body.
|
---|
1300 | * const char *cookie For set HTTP_COOKIE.
|
---|
1301 | * const char *content_type For set CONTENT_TYPE.
|
---|
1302 | */
|
---|
1303 | static void send_cgi_and_exit(
|
---|
1304 | const char *url,
|
---|
1305 | const char *orig_uri,
|
---|
1306 | const char *request,
|
---|
1307 | int post_len,
|
---|
1308 | const char *cookie,
|
---|
1309 | const char *content_type) NORETURN;
|
---|
1310 | static void send_cgi_and_exit(
|
---|
1311 | const char *url,
|
---|
1312 | const char *orig_uri,
|
---|
1313 | const char *request,
|
---|
1314 | int post_len,
|
---|
1315 | const char *cookie,
|
---|
1316 | const char *content_type)
|
---|
1317 | {
|
---|
1318 | struct fd_pair fromCgi; /* CGI -> httpd pipe */
|
---|
1319 | struct fd_pair toCgi; /* httpd -> CGI pipe */
|
---|
1320 | char *script, *last_slash;
|
---|
1321 | int pid;
|
---|
1322 |
|
---|
1323 | /* Make a copy. NB: caller guarantees:
|
---|
1324 | * url[0] == '/', url[1] != '/' */
|
---|
1325 | url = xstrdup(url);
|
---|
1326 |
|
---|
1327 | /*
|
---|
1328 | * We are mucking with environment _first_ and then vfork/exec,
|
---|
1329 | * this allows us to use vfork safely. Parent doesn't care about
|
---|
1330 | * these environment changes anyway.
|
---|
1331 | */
|
---|
1332 |
|
---|
1333 | /* Check for [dirs/]script.cgi/PATH_INFO */
|
---|
1334 | last_slash = script = (char*)url;
|
---|
1335 | while ((script = strchr(script + 1, '/')) != NULL) {
|
---|
1336 | int dir;
|
---|
1337 | *script = '\0';
|
---|
1338 | dir = is_directory(url + 1, /*followlinks:*/ 1);
|
---|
1339 | *script = '/';
|
---|
1340 | if (!dir) {
|
---|
1341 | /* not directory, found script.cgi/PATH_INFO */
|
---|
1342 | break;
|
---|
1343 | }
|
---|
1344 | /* is directory, find next '/' */
|
---|
1345 | last_slash = script;
|
---|
1346 | }
|
---|
1347 | setenv1("PATH_INFO", script); /* set to /PATH_INFO or "" */
|
---|
1348 | setenv1("REQUEST_METHOD", request);
|
---|
1349 | if (g_query) {
|
---|
1350 | putenv(xasprintf("%s=%s?%s", "REQUEST_URI", orig_uri, g_query));
|
---|
1351 | } else {
|
---|
1352 | setenv1("REQUEST_URI", orig_uri);
|
---|
1353 | }
|
---|
1354 | if (script != NULL)
|
---|
1355 | *script = '\0'; /* cut off /PATH_INFO */
|
---|
1356 |
|
---|
1357 | /* SCRIPT_FILENAME is required by PHP in CGI mode */
|
---|
1358 | if (home_httpd[0] == '/') {
|
---|
1359 | char *fullpath = concat_path_file(home_httpd, url);
|
---|
1360 | setenv1("SCRIPT_FILENAME", fullpath);
|
---|
1361 | }
|
---|
1362 | /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
|
---|
1363 | setenv1("SCRIPT_NAME", url);
|
---|
1364 | /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
|
---|
1365 | * QUERY_STRING: The information which follows the ? in the URL
|
---|
1366 | * which referenced this script. This is the query information.
|
---|
1367 | * It should not be decoded in any fashion. This variable
|
---|
1368 | * should always be set when there is query information,
|
---|
1369 | * regardless of command line decoding. */
|
---|
1370 | /* (Older versions of bbox seem to do some decoding) */
|
---|
1371 | setenv1("QUERY_STRING", g_query);
|
---|
1372 | putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
|
---|
1373 | putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
|
---|
1374 | putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
|
---|
1375 | /* Having _separate_ variables for IP and port defeats
|
---|
1376 | * the purpose of having socket abstraction. Which "port"
|
---|
1377 | * are you using on Unix domain socket?
|
---|
1378 | * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
|
---|
1379 | * Oh well... */
|
---|
1380 | {
|
---|
1381 | char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
|
---|
1382 | char *cp = strrchr(p, ':');
|
---|
1383 | if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
|
---|
1384 | cp = NULL;
|
---|
1385 | if (cp) *cp = '\0'; /* delete :PORT */
|
---|
1386 | setenv1("REMOTE_ADDR", p);
|
---|
1387 | if (cp) {
|
---|
1388 | *cp = ':';
|
---|
1389 | #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
|
---|
1390 | setenv1("REMOTE_PORT", cp + 1);
|
---|
1391 | #endif
|
---|
1392 | }
|
---|
1393 | }
|
---|
1394 | setenv1("HTTP_USER_AGENT", user_agent);
|
---|
1395 | if (http_accept)
|
---|
1396 | setenv1("HTTP_ACCEPT", http_accept);
|
---|
1397 | if (http_accept_language)
|
---|
1398 | setenv1("HTTP_ACCEPT_LANGUAGE", http_accept_language);
|
---|
1399 | if (post_len)
|
---|
1400 | putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
|
---|
1401 | if (cookie)
|
---|
1402 | setenv1("HTTP_COOKIE", cookie);
|
---|
1403 | if (content_type)
|
---|
1404 | setenv1("CONTENT_TYPE", content_type);
|
---|
1405 | #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
|
---|
1406 | if (remoteuser) {
|
---|
1407 | setenv1("REMOTE_USER", remoteuser);
|
---|
1408 | putenv((char*)"AUTH_TYPE=Basic");
|
---|
1409 | }
|
---|
1410 | #endif
|
---|
1411 | if (referer)
|
---|
1412 | setenv1("HTTP_REFERER", referer);
|
---|
1413 | setenv1("HTTP_HOST", host); /* set to "" if NULL */
|
---|
1414 | /* setenv1("SERVER_NAME", safe_gethostname()); - don't do this,
|
---|
1415 | * just run "env SERVER_NAME=xyz httpd ..." instead */
|
---|
1416 |
|
---|
1417 | xpiped_pair(fromCgi);
|
---|
1418 | xpiped_pair(toCgi);
|
---|
1419 |
|
---|
1420 | pid = vfork();
|
---|
1421 | if (pid < 0) {
|
---|
1422 | /* TODO: log perror? */
|
---|
1423 | log_and_exit();
|
---|
1424 | }
|
---|
1425 |
|
---|
1426 | if (pid == 0) {
|
---|
1427 | /* Child process */
|
---|
1428 | char *argv[3];
|
---|
1429 |
|
---|
1430 | xfunc_error_retval = 242;
|
---|
1431 |
|
---|
1432 | /* NB: close _first_, then move fds! */
|
---|
1433 | close(toCgi.wr);
|
---|
1434 | close(fromCgi.rd);
|
---|
1435 | xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */
|
---|
1436 | xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */
|
---|
1437 | /* User seeing stderr output can be a security problem.
|
---|
1438 | * If CGI really wants that, it can always do dup itself. */
|
---|
1439 | /* dup2(1, 2); */
|
---|
1440 |
|
---|
1441 | /* Chdiring to script's dir */
|
---|
1442 | script = last_slash;
|
---|
1443 | if (script != url) { /* paranoia */
|
---|
1444 | *script = '\0';
|
---|
1445 | if (chdir(url + 1) != 0) {
|
---|
1446 | bb_perror_msg("can't change directory to '%s'", url + 1);
|
---|
1447 | goto error_execing_cgi;
|
---|
1448 | }
|
---|
1449 | // not needed: *script = '/';
|
---|
1450 | }
|
---|
1451 | script++;
|
---|
1452 |
|
---|
1453 | /* set argv[0] to name without path */
|
---|
1454 | argv[0] = script;
|
---|
1455 | argv[1] = NULL;
|
---|
1456 |
|
---|
1457 | #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
|
---|
1458 | {
|
---|
1459 | char *suffix = strrchr(script, '.');
|
---|
1460 |
|
---|
1461 | if (suffix) {
|
---|
1462 | Htaccess *cur;
|
---|
1463 | for (cur = script_i; cur; cur = cur->next) {
|
---|
1464 | if (strcmp(cur->before_colon + 1, suffix) == 0) {
|
---|
1465 | /* found interpreter name */
|
---|
1466 | argv[0] = cur->after_colon;
|
---|
1467 | argv[1] = script;
|
---|
1468 | argv[2] = NULL;
|
---|
1469 | break;
|
---|
1470 | }
|
---|
1471 | }
|
---|
1472 | }
|
---|
1473 | }
|
---|
1474 | #endif
|
---|
1475 | /* restore default signal dispositions for CGI process */
|
---|
1476 | bb_signals(0
|
---|
1477 | | (1 << SIGCHLD)
|
---|
1478 | | (1 << SIGPIPE)
|
---|
1479 | | (1 << SIGHUP)
|
---|
1480 | , SIG_DFL);
|
---|
1481 |
|
---|
1482 | /* _NOT_ execvp. We do not search PATH. argv[0] is a filename
|
---|
1483 | * without any dir components and will only match a file
|
---|
1484 | * in the current directory */
|
---|
1485 | execv(argv[0], argv);
|
---|
1486 | if (verbose)
|
---|
1487 | bb_perror_msg("can't execute '%s'", argv[0]);
|
---|
1488 | error_execing_cgi:
|
---|
1489 | /* send to stdout
|
---|
1490 | * (we are CGI here, our stdout is pumped to the net) */
|
---|
1491 | send_headers_and_exit(HTTP_NOT_FOUND);
|
---|
1492 | } /* end child */
|
---|
1493 |
|
---|
1494 | /* Parent process */
|
---|
1495 |
|
---|
1496 | /* Restore variables possibly changed by child */
|
---|
1497 | xfunc_error_retval = 0;
|
---|
1498 |
|
---|
1499 | /* Pump data */
|
---|
1500 | close(fromCgi.wr);
|
---|
1501 | close(toCgi.rd);
|
---|
1502 | cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
|
---|
1503 | }
|
---|
1504 |
|
---|
1505 | #endif /* FEATURE_HTTPD_CGI */
|
---|
1506 |
|
---|
1507 | /*
|
---|
1508 | * Send a file response to a HTTP request, and exit
|
---|
1509 | *
|
---|
1510 | * Parameters:
|
---|
1511 | * const char *url The requested URL (with leading /).
|
---|
1512 | * what What to send (headers/body/both).
|
---|
1513 | */
|
---|
1514 | static NOINLINE void send_file_and_exit(const char *url, int what)
|
---|
1515 | {
|
---|
1516 | char *suffix;
|
---|
1517 | int fd;
|
---|
1518 | ssize_t count;
|
---|
1519 |
|
---|
1520 | if (content_gzip) {
|
---|
1521 | /* does <url>.gz exist? Then use it instead */
|
---|
1522 | char *gzurl = xasprintf("%s.gz", url);
|
---|
1523 | fd = open(gzurl, O_RDONLY);
|
---|
1524 | free(gzurl);
|
---|
1525 | if (fd != -1) {
|
---|
1526 | struct stat sb;
|
---|
1527 | fstat(fd, &sb);
|
---|
1528 | file_size = sb.st_size;
|
---|
1529 | last_mod = sb.st_mtime;
|
---|
1530 | } else {
|
---|
1531 | IF_FEATURE_HTTPD_GZIP(content_gzip = 0;)
|
---|
1532 | fd = open(url, O_RDONLY);
|
---|
1533 | }
|
---|
1534 | } else {
|
---|
1535 | fd = open(url, O_RDONLY);
|
---|
1536 | }
|
---|
1537 | if (fd < 0) {
|
---|
1538 | if (DEBUG)
|
---|
1539 | bb_perror_msg("can't open '%s'", url);
|
---|
1540 | /* Error pages are sent by using send_file_and_exit(SEND_BODY).
|
---|
1541 | * IOW: it is unsafe to call send_headers_and_exit
|
---|
1542 | * if what is SEND_BODY! Can recurse! */
|
---|
1543 | if (what != SEND_BODY)
|
---|
1544 | send_headers_and_exit(HTTP_NOT_FOUND);
|
---|
1545 | log_and_exit();
|
---|
1546 | }
|
---|
1547 | /* If you want to know about EPIPE below
|
---|
1548 | * (happens if you abort downloads from local httpd): */
|
---|
1549 | signal(SIGPIPE, SIG_IGN);
|
---|
1550 |
|
---|
1551 | /* If not found, default is "application/octet-stream" */
|
---|
1552 | found_mime_type = "application/octet-stream";
|
---|
1553 | suffix = strrchr(url, '.');
|
---|
1554 | if (suffix) {
|
---|
1555 | static const char suffixTable[] ALIGN1 =
|
---|
1556 | /* Shorter suffix must be first:
|
---|
1557 | * ".html.htm" will fail for ".htm"
|
---|
1558 | */
|
---|
1559 | ".txt.h.c.cc.cpp\0" "text/plain\0"
|
---|
1560 | /* .htm line must be after .h line */
|
---|
1561 | ".htm.html\0" "text/html\0"
|
---|
1562 | ".jpg.jpeg\0" "image/jpeg\0"
|
---|
1563 | ".gif\0" "image/gif\0"
|
---|
1564 | ".png\0" "image/png\0"
|
---|
1565 | /* .css line must be after .c line */
|
---|
1566 | ".css\0" "text/css\0"
|
---|
1567 | ".wav\0" "audio/wav\0"
|
---|
1568 | ".avi\0" "video/x-msvideo\0"
|
---|
1569 | ".qt.mov\0" "video/quicktime\0"
|
---|
1570 | ".mpe.mpeg\0" "video/mpeg\0"
|
---|
1571 | ".mid.midi\0" "audio/midi\0"
|
---|
1572 | ".mp3\0" "audio/mpeg\0"
|
---|
1573 | #if 0 /* unpopular */
|
---|
1574 | ".au\0" "audio/basic\0"
|
---|
1575 | ".pac\0" "application/x-ns-proxy-autoconfig\0"
|
---|
1576 | ".vrml.wrl\0" "model/vrml\0"
|
---|
1577 | #endif
|
---|
1578 | /* compiler adds another "\0" here */
|
---|
1579 | ;
|
---|
1580 | Htaccess *cur;
|
---|
1581 |
|
---|
1582 | /* Examine built-in table */
|
---|
1583 | const char *table = suffixTable;
|
---|
1584 | const char *table_next;
|
---|
1585 | for (; *table; table = table_next) {
|
---|
1586 | const char *try_suffix;
|
---|
1587 | const char *mime_type;
|
---|
1588 | mime_type = table + strlen(table) + 1;
|
---|
1589 | table_next = mime_type + strlen(mime_type) + 1;
|
---|
1590 | try_suffix = strstr(table, suffix);
|
---|
1591 | if (!try_suffix)
|
---|
1592 | continue;
|
---|
1593 | try_suffix += strlen(suffix);
|
---|
1594 | if (*try_suffix == '\0' || *try_suffix == '.') {
|
---|
1595 | found_mime_type = mime_type;
|
---|
1596 | break;
|
---|
1597 | }
|
---|
1598 | /* Example: strstr(table, ".av") != NULL, but it
|
---|
1599 | * does not match ".avi" after all and we end up here.
|
---|
1600 | * The table is arranged so that in this case we know
|
---|
1601 | * that it can't match anything in the following lines,
|
---|
1602 | * and we stop the search: */
|
---|
1603 | break;
|
---|
1604 | }
|
---|
1605 | /* ...then user's table */
|
---|
1606 | for (cur = mime_a; cur; cur = cur->next) {
|
---|
1607 | if (strcmp(cur->before_colon, suffix) == 0) {
|
---|
1608 | found_mime_type = cur->after_colon;
|
---|
1609 | break;
|
---|
1610 | }
|
---|
1611 | }
|
---|
1612 | }
|
---|
1613 |
|
---|
1614 | if (DEBUG)
|
---|
1615 | bb_error_msg("sending file '%s' content-type: %s",
|
---|
1616 | url, found_mime_type);
|
---|
1617 |
|
---|
1618 | #if ENABLE_FEATURE_HTTPD_RANGES
|
---|
1619 | if (what == SEND_BODY /* err pages and ranges don't mix */
|
---|
1620 | || content_gzip /* we are sending compressed page: can't do ranges */ ///why?
|
---|
1621 | ) {
|
---|
1622 | range_start = -1;
|
---|
1623 | }
|
---|
1624 | range_len = MAXINT(off_t);
|
---|
1625 | if (range_start >= 0) {
|
---|
1626 | if (!range_end || range_end > file_size - 1) {
|
---|
1627 | range_end = file_size - 1;
|
---|
1628 | }
|
---|
1629 | if (range_end < range_start
|
---|
1630 | || lseek(fd, range_start, SEEK_SET) != range_start
|
---|
1631 | ) {
|
---|
1632 | lseek(fd, 0, SEEK_SET);
|
---|
1633 | range_start = -1;
|
---|
1634 | } else {
|
---|
1635 | range_len = range_end - range_start + 1;
|
---|
1636 | send_headers(HTTP_PARTIAL_CONTENT);
|
---|
1637 | what = SEND_BODY;
|
---|
1638 | }
|
---|
1639 | }
|
---|
1640 | #endif
|
---|
1641 | if (what & SEND_HEADERS)
|
---|
1642 | send_headers(HTTP_OK);
|
---|
1643 | #if ENABLE_FEATURE_USE_SENDFILE
|
---|
1644 | {
|
---|
1645 | off_t offset = range_start;
|
---|
1646 | while (1) {
|
---|
1647 | /* sz is rounded down to 64k */
|
---|
1648 | ssize_t sz = MAXINT(ssize_t) - 0xffff;
|
---|
1649 | IF_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
|
---|
1650 | count = sendfile(STDOUT_FILENO, fd, &offset, sz);
|
---|
1651 | if (count < 0) {
|
---|
1652 | if (offset == range_start)
|
---|
1653 | break; /* fall back to read/write loop */
|
---|
1654 | goto fin;
|
---|
1655 | }
|
---|
1656 | IF_FEATURE_HTTPD_RANGES(range_len -= count;)
|
---|
1657 | if (count == 0 || range_len == 0)
|
---|
1658 | log_and_exit();
|
---|
1659 | }
|
---|
1660 | }
|
---|
1661 | #endif
|
---|
1662 | while ((count = safe_read(fd, iobuf, IOBUF_SIZE)) > 0) {
|
---|
1663 | ssize_t n;
|
---|
1664 | IF_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
|
---|
1665 | n = full_write(STDOUT_FILENO, iobuf, count);
|
---|
1666 | if (count != n)
|
---|
1667 | break;
|
---|
1668 | IF_FEATURE_HTTPD_RANGES(range_len -= count;)
|
---|
1669 | if (range_len == 0)
|
---|
1670 | break;
|
---|
1671 | }
|
---|
1672 | if (count < 0) {
|
---|
1673 | IF_FEATURE_USE_SENDFILE(fin:)
|
---|
1674 | if (verbose > 1)
|
---|
1675 | bb_perror_msg("error");
|
---|
1676 | }
|
---|
1677 | log_and_exit();
|
---|
1678 | }
|
---|
1679 |
|
---|
1680 | static int checkPermIP(void)
|
---|
1681 | {
|
---|
1682 | Htaccess_IP *cur;
|
---|
1683 |
|
---|
1684 | for (cur = ip_a_d; cur; cur = cur->next) {
|
---|
1685 | #if DEBUG
|
---|
1686 | fprintf(stderr,
|
---|
1687 | "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
|
---|
1688 | rmt_ip_str,
|
---|
1689 | (unsigned char)(cur->ip >> 24),
|
---|
1690 | (unsigned char)(cur->ip >> 16),
|
---|
1691 | (unsigned char)(cur->ip >> 8),
|
---|
1692 | (unsigned char)(cur->ip),
|
---|
1693 | (unsigned char)(cur->mask >> 24),
|
---|
1694 | (unsigned char)(cur->mask >> 16),
|
---|
1695 | (unsigned char)(cur->mask >> 8),
|
---|
1696 | (unsigned char)(cur->mask)
|
---|
1697 | );
|
---|
1698 | #endif
|
---|
1699 | if ((rmt_ip & cur->mask) == cur->ip)
|
---|
1700 | return (cur->allow_deny == 'A'); /* A -> 1 */
|
---|
1701 | }
|
---|
1702 |
|
---|
1703 | return !flg_deny_all; /* depends on whether we saw "D:*" */
|
---|
1704 | }
|
---|
1705 |
|
---|
1706 | #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
|
---|
1707 |
|
---|
1708 | # if ENABLE_PAM
|
---|
1709 | struct pam_userinfo {
|
---|
1710 | const char *name;
|
---|
1711 | const char *pw;
|
---|
1712 | };
|
---|
1713 |
|
---|
1714 | static int pam_talker(int num_msg,
|
---|
1715 | const struct pam_message **msg,
|
---|
1716 | struct pam_response **resp,
|
---|
1717 | void *appdata_ptr)
|
---|
1718 | {
|
---|
1719 | int i;
|
---|
1720 | struct pam_userinfo *userinfo = (struct pam_userinfo *) appdata_ptr;
|
---|
1721 | struct pam_response *response;
|
---|
1722 |
|
---|
1723 | if (!resp || !msg || !userinfo)
|
---|
1724 | return PAM_CONV_ERR;
|
---|
1725 |
|
---|
1726 | /* allocate memory to store response */
|
---|
1727 | response = xzalloc(num_msg * sizeof(*response));
|
---|
1728 |
|
---|
1729 | /* copy values */
|
---|
1730 | for (i = 0; i < num_msg; i++) {
|
---|
1731 | const char *s;
|
---|
1732 |
|
---|
1733 | switch (msg[i]->msg_style) {
|
---|
1734 | case PAM_PROMPT_ECHO_ON:
|
---|
1735 | s = userinfo->name;
|
---|
1736 | break;
|
---|
1737 | case PAM_PROMPT_ECHO_OFF:
|
---|
1738 | s = userinfo->pw;
|
---|
1739 | break;
|
---|
1740 | case PAM_ERROR_MSG:
|
---|
1741 | case PAM_TEXT_INFO:
|
---|
1742 | s = "";
|
---|
1743 | break;
|
---|
1744 | default:
|
---|
1745 | free(response);
|
---|
1746 | return PAM_CONV_ERR;
|
---|
1747 | }
|
---|
1748 | response[i].resp = xstrdup(s);
|
---|
1749 | if (PAM_SUCCESS != 0)
|
---|
1750 | response[i].resp_retcode = PAM_SUCCESS;
|
---|
1751 | }
|
---|
1752 | *resp = response;
|
---|
1753 | return PAM_SUCCESS;
|
---|
1754 | }
|
---|
1755 | # endif
|
---|
1756 |
|
---|
1757 | /*
|
---|
1758 | * Config file entries are of the form "/<path>:<user>:<passwd>".
|
---|
1759 | * If config file has no prefix match for path, access is allowed.
|
---|
1760 | *
|
---|
1761 | * path The file path
|
---|
1762 | * user_and_passwd "user:passwd" to validate
|
---|
1763 | *
|
---|
1764 | * Returns 1 if user_and_passwd is OK.
|
---|
1765 | */
|
---|
1766 | static int check_user_passwd(const char *path, char *user_and_passwd)
|
---|
1767 | {
|
---|
1768 | Htaccess *cur;
|
---|
1769 | const char *prev = NULL;
|
---|
1770 |
|
---|
1771 | for (cur = g_auth; cur; cur = cur->next) {
|
---|
1772 | const char *dir_prefix;
|
---|
1773 | size_t len;
|
---|
1774 | int r;
|
---|
1775 |
|
---|
1776 | dir_prefix = cur->before_colon;
|
---|
1777 |
|
---|
1778 | /* WHY? */
|
---|
1779 | /* If already saw a match, don't accept other different matches */
|
---|
1780 | if (prev && strcmp(prev, dir_prefix) != 0)
|
---|
1781 | continue;
|
---|
1782 |
|
---|
1783 | if (DEBUG)
|
---|
1784 | fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd);
|
---|
1785 |
|
---|
1786 | /* If it's not a prefix match, continue searching */
|
---|
1787 | len = strlen(dir_prefix);
|
---|
1788 | if (len != 1 /* dir_prefix "/" matches all, don't need to check */
|
---|
1789 | && (strncmp(dir_prefix, path, len) != 0
|
---|
1790 | || (path[len] != '/' && path[len] != '\0')
|
---|
1791 | )
|
---|
1792 | ) {
|
---|
1793 | continue;
|
---|
1794 | }
|
---|
1795 |
|
---|
1796 | /* Path match found */
|
---|
1797 | prev = dir_prefix;
|
---|
1798 |
|
---|
1799 | if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
|
---|
1800 | char *colon_after_user;
|
---|
1801 | const char *passwd;
|
---|
1802 | # if ENABLE_FEATURE_SHADOWPASSWDS && !ENABLE_PAM
|
---|
1803 | char sp_buf[256];
|
---|
1804 | # endif
|
---|
1805 |
|
---|
1806 | colon_after_user = strchr(user_and_passwd, ':');
|
---|
1807 | if (!colon_after_user)
|
---|
1808 | goto bad_input;
|
---|
1809 |
|
---|
1810 | /* compare "user:" */
|
---|
1811 | if (cur->after_colon[0] != '*'
|
---|
1812 | && strncmp(cur->after_colon, user_and_passwd,
|
---|
1813 | colon_after_user - user_and_passwd + 1) != 0
|
---|
1814 | ) {
|
---|
1815 | continue;
|
---|
1816 | }
|
---|
1817 | /* this cfg entry is '*' or matches username from peer */
|
---|
1818 |
|
---|
1819 | passwd = strchr(cur->after_colon, ':');
|
---|
1820 | if (!passwd)
|
---|
1821 | goto bad_input;
|
---|
1822 | passwd++;
|
---|
1823 | if (passwd[0] == '*') {
|
---|
1824 | # if ENABLE_PAM
|
---|
1825 | struct pam_userinfo userinfo;
|
---|
1826 | struct pam_conv conv_info = { &pam_talker, (void *) &userinfo };
|
---|
1827 | pam_handle_t *pamh;
|
---|
1828 |
|
---|
1829 | *colon_after_user = '\0';
|
---|
1830 | userinfo.name = user_and_passwd;
|
---|
1831 | userinfo.pw = colon_after_user + 1;
|
---|
1832 | r = pam_start("httpd", user_and_passwd, &conv_info, &pamh) != PAM_SUCCESS;
|
---|
1833 | if (r == 0) {
|
---|
1834 | r = pam_authenticate(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS
|
---|
1835 | || pam_acct_mgmt(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS
|
---|
1836 | ;
|
---|
1837 | pam_end(pamh, PAM_SUCCESS);
|
---|
1838 | }
|
---|
1839 | *colon_after_user = ':';
|
---|
1840 | goto end_check_passwd;
|
---|
1841 | # else
|
---|
1842 | # if ENABLE_FEATURE_SHADOWPASSWDS
|
---|
1843 | /* Using _r function to avoid pulling in static buffers */
|
---|
1844 | struct spwd spw;
|
---|
1845 | # endif
|
---|
1846 | struct passwd *pw;
|
---|
1847 |
|
---|
1848 | *colon_after_user = '\0';
|
---|
1849 | pw = getpwnam(user_and_passwd);
|
---|
1850 | *colon_after_user = ':';
|
---|
1851 | if (!pw || !pw->pw_passwd)
|
---|
1852 | continue;
|
---|
1853 | passwd = pw->pw_passwd;
|
---|
1854 | # if ENABLE_FEATURE_SHADOWPASSWDS
|
---|
1855 | if ((passwd[0] == 'x' || passwd[0] == '*') && !passwd[1]) {
|
---|
1856 | /* getspnam_r may return 0 yet set result to NULL.
|
---|
1857 | * At least glibc 2.4 does this. Be extra paranoid here. */
|
---|
1858 | struct spwd *result = NULL;
|
---|
1859 | r = getspnam_r(pw->pw_name, &spw, sp_buf, sizeof(sp_buf), &result);
|
---|
1860 | if (r == 0 && result)
|
---|
1861 | passwd = result->sp_pwdp;
|
---|
1862 | }
|
---|
1863 | # endif
|
---|
1864 | /* In this case, passwd is ALWAYS encrypted:
|
---|
1865 | * it came from /etc/passwd or /etc/shadow!
|
---|
1866 | */
|
---|
1867 | goto check_encrypted;
|
---|
1868 | # endif /* ENABLE_PAM */
|
---|
1869 | }
|
---|
1870 | /* Else: passwd is from httpd.conf, it is either plaintext or encrypted */
|
---|
1871 |
|
---|
1872 | if (passwd[0] == '$' && isdigit(passwd[1])) {
|
---|
1873 | char *encrypted;
|
---|
1874 | # if !ENABLE_PAM
|
---|
1875 | check_encrypted:
|
---|
1876 | # endif
|
---|
1877 | /* encrypt pwd from peer and check match with local one */
|
---|
1878 | encrypted = pw_encrypt(
|
---|
1879 | /* pwd (from peer): */ colon_after_user + 1,
|
---|
1880 | /* salt: */ passwd,
|
---|
1881 | /* cleanup: */ 0
|
---|
1882 | );
|
---|
1883 | r = strcmp(encrypted, passwd);
|
---|
1884 | free(encrypted);
|
---|
1885 | } else {
|
---|
1886 | /* local passwd is from httpd.conf and it's plaintext */
|
---|
1887 | r = strcmp(colon_after_user + 1, passwd);
|
---|
1888 | }
|
---|
1889 | goto end_check_passwd;
|
---|
1890 | }
|
---|
1891 | bad_input:
|
---|
1892 | /* Comparing plaintext "user:pass" in one go */
|
---|
1893 | r = strcmp(cur->after_colon, user_and_passwd);
|
---|
1894 | end_check_passwd:
|
---|
1895 | if (r == 0) {
|
---|
1896 | remoteuser = xstrndup(user_and_passwd,
|
---|
1897 | strchrnul(user_and_passwd, ':') - user_and_passwd
|
---|
1898 | );
|
---|
1899 | return 1; /* Ok */
|
---|
1900 | }
|
---|
1901 | } /* for */
|
---|
1902 |
|
---|
1903 | /* 0(bad) if prev is set: matches were found but passwd was wrong */
|
---|
1904 | return (prev == NULL);
|
---|
1905 | }
|
---|
1906 | #endif /* FEATURE_HTTPD_BASIC_AUTH */
|
---|
1907 |
|
---|
1908 | #if ENABLE_FEATURE_HTTPD_PROXY
|
---|
1909 | static Htaccess_Proxy *find_proxy_entry(const char *url)
|
---|
1910 | {
|
---|
1911 | Htaccess_Proxy *p;
|
---|
1912 | for (p = proxy; p; p = p->next) {
|
---|
1913 | if (is_prefixed_with(url, p->url_from))
|
---|
1914 | return p;
|
---|
1915 | }
|
---|
1916 | return NULL;
|
---|
1917 | }
|
---|
1918 | #endif
|
---|
1919 |
|
---|
1920 | /*
|
---|
1921 | * Handle timeouts
|
---|
1922 | */
|
---|
1923 | static void send_REQUEST_TIMEOUT_and_exit(int sig) NORETURN;
|
---|
1924 | static void send_REQUEST_TIMEOUT_and_exit(int sig UNUSED_PARAM)
|
---|
1925 | {
|
---|
1926 | send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
|
---|
1927 | }
|
---|
1928 |
|
---|
1929 | /*
|
---|
1930 | * Handle an incoming http request and exit.
|
---|
1931 | */
|
---|
1932 | static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) NORETURN;
|
---|
1933 | static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
|
---|
1934 | {
|
---|
1935 | static const char request_GET[] ALIGN1 = "GET";
|
---|
1936 | struct stat sb;
|
---|
1937 | char *urlcopy;
|
---|
1938 | char *urlp;
|
---|
1939 | char *tptr;
|
---|
1940 | #if ENABLE_FEATURE_HTTPD_CGI
|
---|
1941 | static const char request_HEAD[] ALIGN1 = "HEAD";
|
---|
1942 | const char *prequest;
|
---|
1943 | char *cookie = NULL;
|
---|
1944 | char *content_type = NULL;
|
---|
1945 | unsigned long length = 0;
|
---|
1946 | #elif ENABLE_FEATURE_HTTPD_PROXY
|
---|
1947 | #define prequest request_GET
|
---|
1948 | unsigned long length = 0;
|
---|
1949 | #endif
|
---|
1950 | #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
|
---|
1951 | smallint authorized = -1;
|
---|
1952 | #endif
|
---|
1953 | smallint ip_allowed;
|
---|
1954 | char http_major_version;
|
---|
1955 | #if ENABLE_FEATURE_HTTPD_PROXY
|
---|
1956 | char http_minor_version;
|
---|
1957 | char *header_buf = header_buf; /* for gcc */
|
---|
1958 | char *header_ptr = header_ptr;
|
---|
1959 | Htaccess_Proxy *proxy_entry;
|
---|
1960 | #endif
|
---|
1961 |
|
---|
1962 | /* Allocation of iobuf is postponed until now
|
---|
1963 | * (IOW, server process doesn't need to waste 8k) */
|
---|
1964 | iobuf = xmalloc(IOBUF_SIZE);
|
---|
1965 |
|
---|
1966 | rmt_ip = 0;
|
---|
1967 | if (fromAddr->u.sa.sa_family == AF_INET) {
|
---|
1968 | rmt_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr);
|
---|
1969 | }
|
---|
1970 | #if ENABLE_FEATURE_IPV6
|
---|
1971 | if (fromAddr->u.sa.sa_family == AF_INET6
|
---|
1972 | && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0
|
---|
1973 | && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0
|
---|
1974 | && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff)
|
---|
1975 | rmt_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]);
|
---|
1976 | #endif
|
---|
1977 | if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
|
---|
1978 | /* NB: can be NULL (user runs httpd -i by hand?) */
|
---|
1979 | rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa);
|
---|
1980 | }
|
---|
1981 | if (verbose) {
|
---|
1982 | /* this trick makes -v logging much simpler */
|
---|
1983 | if (rmt_ip_str)
|
---|
1984 | applet_name = rmt_ip_str;
|
---|
1985 | if (verbose > 2)
|
---|
1986 | bb_error_msg("connected");
|
---|
1987 | }
|
---|
1988 |
|
---|
1989 | /* Install timeout handler. get_line() needs it. */
|
---|
1990 | signal(SIGALRM, send_REQUEST_TIMEOUT_and_exit);
|
---|
1991 |
|
---|
1992 | if (!get_line()) /* EOF or error or empty line */
|
---|
1993 | send_headers_and_exit(HTTP_BAD_REQUEST);
|
---|
1994 |
|
---|
1995 | /* Determine type of request (GET/POST) */
|
---|
1996 | // rfc2616: method and URI is separated by exactly one space
|
---|
1997 | //urlp = strpbrk(iobuf, " \t"); - no, tab isn't allowed
|
---|
1998 | urlp = strchr(iobuf, ' ');
|
---|
1999 | if (urlp == NULL)
|
---|
2000 | send_headers_and_exit(HTTP_BAD_REQUEST);
|
---|
2001 | *urlp++ = '\0';
|
---|
2002 | #if ENABLE_FEATURE_HTTPD_CGI
|
---|
2003 | prequest = request_GET;
|
---|
2004 | if (strcasecmp(iobuf, prequest) != 0) {
|
---|
2005 | prequest = request_HEAD;
|
---|
2006 | if (strcasecmp(iobuf, prequest) != 0) {
|
---|
2007 | prequest = "POST";
|
---|
2008 | if (strcasecmp(iobuf, prequest) != 0)
|
---|
2009 | send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
|
---|
2010 | }
|
---|
2011 | }
|
---|
2012 | #else
|
---|
2013 | if (strcasecmp(iobuf, request_GET) != 0)
|
---|
2014 | send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
|
---|
2015 | #endif
|
---|
2016 | // rfc2616: method and URI is separated by exactly one space
|
---|
2017 | //urlp = skip_whitespace(urlp); - should not be necessary
|
---|
2018 | if (urlp[0] != '/')
|
---|
2019 | send_headers_and_exit(HTTP_BAD_REQUEST);
|
---|
2020 |
|
---|
2021 | /* Find end of URL and parse HTTP version, if any */
|
---|
2022 | http_major_version = '0';
|
---|
2023 | IF_FEATURE_HTTPD_PROXY(http_minor_version = '0';)
|
---|
2024 | tptr = strchrnul(urlp, ' ');
|
---|
2025 | /* Is it " HTTP/"? */
|
---|
2026 | if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) {
|
---|
2027 | http_major_version = tptr[6];
|
---|
2028 | IF_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];)
|
---|
2029 | }
|
---|
2030 | *tptr = '\0';
|
---|
2031 |
|
---|
2032 | /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
|
---|
2033 | urlcopy = alloca((tptr - urlp) + 2 + strlen(index_page));
|
---|
2034 | /*if (urlcopy == NULL)
|
---|
2035 | * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
|
---|
2036 | strcpy(urlcopy, urlp);
|
---|
2037 | /* NB: urlcopy ptr is never changed after this */
|
---|
2038 |
|
---|
2039 | /* Extract url args if present */
|
---|
2040 | /* g_query = NULL; - already is */
|
---|
2041 | tptr = strchr(urlcopy, '?');
|
---|
2042 | if (tptr) {
|
---|
2043 | *tptr++ = '\0';
|
---|
2044 | g_query = tptr;
|
---|
2045 | }
|
---|
2046 |
|
---|
2047 | /* Decode URL escape sequences */
|
---|
2048 | tptr = percent_decode_in_place(urlcopy, /*strict:*/ 1);
|
---|
2049 | if (tptr == NULL)
|
---|
2050 | send_headers_and_exit(HTTP_BAD_REQUEST);
|
---|
2051 | if (tptr == urlcopy + 1) {
|
---|
2052 | /* '/' or NUL is encoded */
|
---|
2053 | send_headers_and_exit(HTTP_NOT_FOUND);
|
---|
2054 | }
|
---|
2055 |
|
---|
2056 | /* Canonicalize path */
|
---|
2057 | /* Algorithm stolen from libbb bb_simplify_path(),
|
---|
2058 | * but don't strdup, retain trailing slash, protect root */
|
---|
2059 | urlp = tptr = urlcopy;
|
---|
2060 | for (;;) {
|
---|
2061 | if (*urlp == '/') {
|
---|
2062 | /* skip duplicate (or initial) slash */
|
---|
2063 | if (*tptr == '/') {
|
---|
2064 | goto next_char;
|
---|
2065 | }
|
---|
2066 | if (*tptr == '.') {
|
---|
2067 | if (tptr[1] == '.' && (tptr[2] == '/' || tptr[2] == '\0')) {
|
---|
2068 | /* "..": be careful */
|
---|
2069 | /* protect root */
|
---|
2070 | if (urlp == urlcopy)
|
---|
2071 | send_headers_and_exit(HTTP_BAD_REQUEST);
|
---|
2072 | /* omit previous dir */
|
---|
2073 | while (*--urlp != '/')
|
---|
2074 | continue;
|
---|
2075 | /* skip to "./" or ".<NUL>" */
|
---|
2076 | tptr++;
|
---|
2077 | }
|
---|
2078 | if (tptr[1] == '/' || tptr[1] == '\0') {
|
---|
2079 | /* skip extra "/./" */
|
---|
2080 | goto next_char;
|
---|
2081 | }
|
---|
2082 | }
|
---|
2083 | }
|
---|
2084 | *++urlp = *tptr;
|
---|
2085 | if (*urlp == '\0')
|
---|
2086 | break;
|
---|
2087 | next_char:
|
---|
2088 | tptr++;
|
---|
2089 | }
|
---|
2090 |
|
---|
2091 | /* If URL is a directory, add '/' */
|
---|
2092 | if (urlp[-1] != '/') {
|
---|
2093 | if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) {
|
---|
2094 | found_moved_temporarily = urlcopy;
|
---|
2095 | }
|
---|
2096 | }
|
---|
2097 |
|
---|
2098 | /* Log it */
|
---|
2099 | if (verbose > 1)
|
---|
2100 | bb_error_msg("url:%s", urlcopy);
|
---|
2101 |
|
---|
2102 | tptr = urlcopy;
|
---|
2103 | ip_allowed = checkPermIP();
|
---|
2104 | while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
|
---|
2105 | /* have path1/path2 */
|
---|
2106 | *tptr = '\0';
|
---|
2107 | if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) {
|
---|
2108 | /* may have subdir config */
|
---|
2109 | parse_conf(urlcopy + 1, SUBDIR_PARSE);
|
---|
2110 | ip_allowed = checkPermIP();
|
---|
2111 | }
|
---|
2112 | *tptr = '/';
|
---|
2113 | }
|
---|
2114 |
|
---|
2115 | #if ENABLE_FEATURE_HTTPD_PROXY
|
---|
2116 | proxy_entry = find_proxy_entry(urlcopy);
|
---|
2117 | if (proxy_entry)
|
---|
2118 | header_buf = header_ptr = xmalloc(IOBUF_SIZE);
|
---|
2119 | #endif
|
---|
2120 |
|
---|
2121 | if (http_major_version >= '0') {
|
---|
2122 | /* Request was with "... HTTP/nXXX", and n >= 0 */
|
---|
2123 |
|
---|
2124 | /* Read until blank line */
|
---|
2125 | while (1) {
|
---|
2126 | if (!get_line())
|
---|
2127 | break; /* EOF or error or empty line */
|
---|
2128 | if (DEBUG)
|
---|
2129 | bb_error_msg("header: '%s'", iobuf);
|
---|
2130 |
|
---|
2131 | #if ENABLE_FEATURE_HTTPD_PROXY
|
---|
2132 | /* We need 2 more bytes for yet another "\r\n" -
|
---|
2133 | * see near fdprintf(proxy_fd...) further below */
|
---|
2134 | if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 2) {
|
---|
2135 | int len = strlen(iobuf);
|
---|
2136 | if (len > IOBUF_SIZE - (header_ptr - header_buf) - 4)
|
---|
2137 | len = IOBUF_SIZE - (header_ptr - header_buf) - 4;
|
---|
2138 | memcpy(header_ptr, iobuf, len);
|
---|
2139 | header_ptr += len;
|
---|
2140 | header_ptr[0] = '\r';
|
---|
2141 | header_ptr[1] = '\n';
|
---|
2142 | header_ptr += 2;
|
---|
2143 | }
|
---|
2144 | #endif
|
---|
2145 |
|
---|
2146 | #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
|
---|
2147 | /* Try and do our best to parse more lines */
|
---|
2148 | if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
|
---|
2149 | /* extra read only for POST */
|
---|
2150 | if (prequest != request_GET
|
---|
2151 | # if ENABLE_FEATURE_HTTPD_CGI
|
---|
2152 | && prequest != request_HEAD
|
---|
2153 | # endif
|
---|
2154 | ) {
|
---|
2155 | tptr = skip_whitespace(iobuf + sizeof("Content-length:") - 1);
|
---|
2156 | if (!tptr[0])
|
---|
2157 | send_headers_and_exit(HTTP_BAD_REQUEST);
|
---|
2158 | /* not using strtoul: it ignores leading minus! */
|
---|
2159 | length = bb_strtou(tptr, NULL, 10);
|
---|
2160 | /* length is "ulong", but we need to pass it to int later */
|
---|
2161 | if (errno || length > INT_MAX)
|
---|
2162 | send_headers_and_exit(HTTP_BAD_REQUEST);
|
---|
2163 | }
|
---|
2164 | }
|
---|
2165 | #endif
|
---|
2166 | #if ENABLE_FEATURE_HTTPD_CGI
|
---|
2167 | else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
|
---|
2168 | cookie = xstrdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
|
---|
2169 | } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
|
---|
2170 | content_type = xstrdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
|
---|
2171 | } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
|
---|
2172 | referer = xstrdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
|
---|
2173 | } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
|
---|
2174 | user_agent = xstrdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
|
---|
2175 | } else if (STRNCASECMP(iobuf, "Host:") == 0) {
|
---|
2176 | host = xstrdup(skip_whitespace(iobuf + sizeof("Host:")-1));
|
---|
2177 | } else if (STRNCASECMP(iobuf, "Accept:") == 0) {
|
---|
2178 | http_accept = xstrdup(skip_whitespace(iobuf + sizeof("Accept:")-1));
|
---|
2179 | } else if (STRNCASECMP(iobuf, "Accept-Language:") == 0) {
|
---|
2180 | http_accept_language = xstrdup(skip_whitespace(iobuf + sizeof("Accept-Language:")-1));
|
---|
2181 | }
|
---|
2182 | #endif
|
---|
2183 | #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
|
---|
2184 | if (STRNCASECMP(iobuf, "Authorization:") == 0) {
|
---|
2185 | /* We only allow Basic credentials.
|
---|
2186 | * It shows up as "Authorization: Basic <user>:<passwd>" where
|
---|
2187 | * "<user>:<passwd>" is base64 encoded.
|
---|
2188 | */
|
---|
2189 | tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
|
---|
2190 | if (STRNCASECMP(tptr, "Basic") != 0)
|
---|
2191 | continue;
|
---|
2192 | tptr += sizeof("Basic")-1;
|
---|
2193 | /* decodeBase64() skips whitespace itself */
|
---|
2194 | decodeBase64(tptr);
|
---|
2195 | authorized = check_user_passwd(urlcopy, tptr);
|
---|
2196 | }
|
---|
2197 | #endif
|
---|
2198 | #if ENABLE_FEATURE_HTTPD_RANGES
|
---|
2199 | if (STRNCASECMP(iobuf, "Range:") == 0) {
|
---|
2200 | /* We know only bytes=NNN-[MMM] */
|
---|
2201 | char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
|
---|
2202 | if (is_prefixed_with(s, "bytes=") == 0) {
|
---|
2203 | s += sizeof("bytes=")-1;
|
---|
2204 | range_start = BB_STRTOOFF(s, &s, 10);
|
---|
2205 | if (s[0] != '-' || range_start < 0) {
|
---|
2206 | range_start = -1;
|
---|
2207 | } else if (s[1]) {
|
---|
2208 | range_end = BB_STRTOOFF(s+1, NULL, 10);
|
---|
2209 | if (errno || range_end < range_start)
|
---|
2210 | range_start = -1;
|
---|
2211 | }
|
---|
2212 | }
|
---|
2213 | }
|
---|
2214 | #endif
|
---|
2215 | #if ENABLE_FEATURE_HTTPD_GZIP
|
---|
2216 | if (STRNCASECMP(iobuf, "Accept-Encoding:") == 0) {
|
---|
2217 | /* Note: we do not support "gzip;q=0"
|
---|
2218 | * method of _disabling_ gzip
|
---|
2219 | * delivery. No one uses that, though */
|
---|
2220 | const char *s = strstr(iobuf, "gzip");
|
---|
2221 | if (s) {
|
---|
2222 | // want more thorough checks?
|
---|
2223 | //if (s[-1] == ' '
|
---|
2224 | // || s[-1] == ','
|
---|
2225 | // || s[-1] == ':'
|
---|
2226 | //) {
|
---|
2227 | content_gzip = 1;
|
---|
2228 | //}
|
---|
2229 | }
|
---|
2230 | }
|
---|
2231 | #endif
|
---|
2232 | } /* while extra header reading */
|
---|
2233 | }
|
---|
2234 |
|
---|
2235 | /* We are done reading headers, disable peer timeout */
|
---|
2236 | alarm(0);
|
---|
2237 |
|
---|
2238 | if (strcmp(bb_basename(urlcopy), HTTPD_CONF) == 0 || !ip_allowed) {
|
---|
2239 | /* protect listing [/path]/httpd.conf or IP deny */
|
---|
2240 | send_headers_and_exit(HTTP_FORBIDDEN);
|
---|
2241 | }
|
---|
2242 |
|
---|
2243 | #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
|
---|
2244 | /* Case: no "Authorization:" was seen, but page might require passwd.
|
---|
2245 | * Check that with dummy user:pass */
|
---|
2246 | if (authorized < 0)
|
---|
2247 | authorized = check_user_passwd(urlcopy, (char *) "");
|
---|
2248 | if (!authorized)
|
---|
2249 | send_headers_and_exit(HTTP_UNAUTHORIZED);
|
---|
2250 | #endif
|
---|
2251 |
|
---|
2252 | if (found_moved_temporarily) {
|
---|
2253 | send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
|
---|
2254 | }
|
---|
2255 |
|
---|
2256 | #if ENABLE_FEATURE_HTTPD_PROXY
|
---|
2257 | if (proxy_entry != NULL) {
|
---|
2258 | int proxy_fd;
|
---|
2259 | len_and_sockaddr *lsa;
|
---|
2260 |
|
---|
2261 | proxy_fd = socket(AF_INET, SOCK_STREAM, 0);
|
---|
2262 | if (proxy_fd < 0)
|
---|
2263 | send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
|
---|
2264 | lsa = host2sockaddr(proxy_entry->host_port, 80);
|
---|
2265 | if (lsa == NULL)
|
---|
2266 | send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
|
---|
2267 | if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0)
|
---|
2268 | send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
|
---|
2269 | fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n",
|
---|
2270 | prequest, /* GET or POST */
|
---|
2271 | proxy_entry->url_to, /* url part 1 */
|
---|
2272 | urlcopy + strlen(proxy_entry->url_from), /* url part 2 */
|
---|
2273 | (g_query ? "?" : ""), /* "?" (maybe) */
|
---|
2274 | (g_query ? g_query : ""), /* query string (maybe) */
|
---|
2275 | http_major_version, http_minor_version);
|
---|
2276 | header_ptr[0] = '\r';
|
---|
2277 | header_ptr[1] = '\n';
|
---|
2278 | header_ptr += 2;
|
---|
2279 | write(proxy_fd, header_buf, header_ptr - header_buf);
|
---|
2280 | free(header_buf); /* on the order of 8k, free it */
|
---|
2281 | cgi_io_loop_and_exit(proxy_fd, proxy_fd, length);
|
---|
2282 | }
|
---|
2283 | #endif
|
---|
2284 |
|
---|
2285 | tptr = urlcopy + 1; /* skip first '/' */
|
---|
2286 |
|
---|
2287 | #if ENABLE_FEATURE_HTTPD_CGI
|
---|
2288 | if (is_prefixed_with(tptr, "cgi-bin/")) {
|
---|
2289 | if (tptr[8] == '\0') {
|
---|
2290 | /* protect listing "cgi-bin/" */
|
---|
2291 | send_headers_and_exit(HTTP_FORBIDDEN);
|
---|
2292 | }
|
---|
2293 | send_cgi_and_exit(urlcopy, urlcopy, prequest, length, cookie, content_type);
|
---|
2294 | }
|
---|
2295 | #endif
|
---|
2296 |
|
---|
2297 | if (urlp[-1] == '/') {
|
---|
2298 | /* When index_page string is appended to <dir>/ URL, it overwrites
|
---|
2299 | * the query string. If we fall back to call /cgi-bin/index.cgi,
|
---|
2300 | * query string would be lost and not available to the CGI.
|
---|
2301 | * Work around it by making a deep copy.
|
---|
2302 | */
|
---|
2303 | if (ENABLE_FEATURE_HTTPD_CGI)
|
---|
2304 | g_query = xstrdup(g_query); /* ok for NULL too */
|
---|
2305 | strcpy(urlp, index_page);
|
---|
2306 | }
|
---|
2307 | if (stat(tptr, &sb) == 0) {
|
---|
2308 | #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
|
---|
2309 | char *suffix = strrchr(tptr, '.');
|
---|
2310 | if (suffix) {
|
---|
2311 | Htaccess *cur;
|
---|
2312 | for (cur = script_i; cur; cur = cur->next) {
|
---|
2313 | if (strcmp(cur->before_colon + 1, suffix) == 0) {
|
---|
2314 | send_cgi_and_exit(urlcopy, urlcopy, prequest, length, cookie, content_type);
|
---|
2315 | }
|
---|
2316 | }
|
---|
2317 | }
|
---|
2318 | #endif
|
---|
2319 | file_size = sb.st_size;
|
---|
2320 | last_mod = sb.st_mtime;
|
---|
2321 | }
|
---|
2322 | #if ENABLE_FEATURE_HTTPD_CGI
|
---|
2323 | else if (urlp[-1] == '/') {
|
---|
2324 | /* It's a dir URL and there is no index.html
|
---|
2325 | * Try cgi-bin/index.cgi */
|
---|
2326 | if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
|
---|
2327 | urlp[0] = '\0'; /* remove index_page */
|
---|
2328 | send_cgi_and_exit("/cgi-bin/index.cgi", urlcopy, prequest, length, cookie, content_type);
|
---|
2329 | }
|
---|
2330 | }
|
---|
2331 | /* else fall through to send_file, it errors out if open fails: */
|
---|
2332 |
|
---|
2333 | if (prequest != request_GET && prequest != request_HEAD) {
|
---|
2334 | /* POST for files does not make sense */
|
---|
2335 | send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
|
---|
2336 | }
|
---|
2337 | send_file_and_exit(tptr,
|
---|
2338 | (prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS)
|
---|
2339 | );
|
---|
2340 | #else
|
---|
2341 | send_file_and_exit(tptr, SEND_HEADERS_AND_BODY);
|
---|
2342 | #endif
|
---|
2343 | }
|
---|
2344 |
|
---|
2345 | /*
|
---|
2346 | * The main http server function.
|
---|
2347 | * Given a socket, listen for new connections and farm out
|
---|
2348 | * the processing as a [v]forked process.
|
---|
2349 | * Never returns.
|
---|
2350 | */
|
---|
2351 | #if BB_MMU
|
---|
2352 | static void mini_httpd(int server_socket) NORETURN;
|
---|
2353 | static void mini_httpd(int server_socket)
|
---|
2354 | {
|
---|
2355 | /* NB: it's best to not use xfuncs in this loop before fork().
|
---|
2356 | * Otherwise server may die on transient errors (temporary
|
---|
2357 | * out-of-memory condition, etc), which is Bad(tm).
|
---|
2358 | * Try to do any dangerous calls after fork.
|
---|
2359 | */
|
---|
2360 | while (1) {
|
---|
2361 | int n;
|
---|
2362 | len_and_sockaddr fromAddr;
|
---|
2363 |
|
---|
2364 | /* Wait for connections... */
|
---|
2365 | fromAddr.len = LSA_SIZEOF_SA;
|
---|
2366 | n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
|
---|
2367 | if (n < 0)
|
---|
2368 | continue;
|
---|
2369 |
|
---|
2370 | /* set the KEEPALIVE option to cull dead connections */
|
---|
2371 | setsockopt_keepalive(n);
|
---|
2372 |
|
---|
2373 | if (fork() == 0) {
|
---|
2374 | /* child */
|
---|
2375 | /* Do not reload config on HUP */
|
---|
2376 | signal(SIGHUP, SIG_IGN);
|
---|
2377 | close(server_socket);
|
---|
2378 | xmove_fd(n, 0);
|
---|
2379 | xdup2(0, 1);
|
---|
2380 |
|
---|
2381 | handle_incoming_and_exit(&fromAddr);
|
---|
2382 | }
|
---|
2383 | /* parent, or fork failed */
|
---|
2384 | close(n);
|
---|
2385 | } /* while (1) */
|
---|
2386 | /* never reached */
|
---|
2387 | }
|
---|
2388 | #else
|
---|
2389 | static void mini_httpd_nommu(int server_socket, int argc, char **argv) NORETURN;
|
---|
2390 | static void mini_httpd_nommu(int server_socket, int argc, char **argv)
|
---|
2391 | {
|
---|
2392 | char *argv_copy[argc + 2];
|
---|
2393 |
|
---|
2394 | argv_copy[0] = argv[0];
|
---|
2395 | argv_copy[1] = (char*)"-i";
|
---|
2396 | memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
|
---|
2397 |
|
---|
2398 | /* NB: it's best to not use xfuncs in this loop before vfork().
|
---|
2399 | * Otherwise server may die on transient errors (temporary
|
---|
2400 | * out-of-memory condition, etc), which is Bad(tm).
|
---|
2401 | * Try to do any dangerous calls after fork.
|
---|
2402 | */
|
---|
2403 | while (1) {
|
---|
2404 | int n;
|
---|
2405 | len_and_sockaddr fromAddr;
|
---|
2406 |
|
---|
2407 | /* Wait for connections... */
|
---|
2408 | fromAddr.len = LSA_SIZEOF_SA;
|
---|
2409 | n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
|
---|
2410 | if (n < 0)
|
---|
2411 | continue;
|
---|
2412 |
|
---|
2413 | /* set the KEEPALIVE option to cull dead connections */
|
---|
2414 | setsockopt_keepalive(n);
|
---|
2415 |
|
---|
2416 | if (vfork() == 0) {
|
---|
2417 | /* child */
|
---|
2418 | /* Do not reload config on HUP */
|
---|
2419 | signal(SIGHUP, SIG_IGN);
|
---|
2420 | close(server_socket);
|
---|
2421 | xmove_fd(n, 0);
|
---|
2422 | xdup2(0, 1);
|
---|
2423 |
|
---|
2424 | /* Run a copy of ourself in inetd mode */
|
---|
2425 | re_exec(argv_copy);
|
---|
2426 | }
|
---|
2427 | argv_copy[0][0] &= 0x7f;
|
---|
2428 | /* parent, or vfork failed */
|
---|
2429 | close(n);
|
---|
2430 | } /* while (1) */
|
---|
2431 | /* never reached */
|
---|
2432 | }
|
---|
2433 | #endif
|
---|
2434 |
|
---|
2435 | /*
|
---|
2436 | * Process a HTTP connection on stdin/out.
|
---|
2437 | * Never returns.
|
---|
2438 | */
|
---|
2439 | static void mini_httpd_inetd(void) NORETURN;
|
---|
2440 | static void mini_httpd_inetd(void)
|
---|
2441 | {
|
---|
2442 | len_and_sockaddr fromAddr;
|
---|
2443 |
|
---|
2444 | memset(&fromAddr, 0, sizeof(fromAddr));
|
---|
2445 | fromAddr.len = LSA_SIZEOF_SA;
|
---|
2446 | /* NB: can fail if user runs it by hand and types in http cmds */
|
---|
2447 | getpeername(0, &fromAddr.u.sa, &fromAddr.len);
|
---|
2448 | handle_incoming_and_exit(&fromAddr);
|
---|
2449 | }
|
---|
2450 |
|
---|
2451 | static void sighup_handler(int sig UNUSED_PARAM)
|
---|
2452 | {
|
---|
2453 | parse_conf(DEFAULT_PATH_HTTPD_CONF, SIGNALED_PARSE);
|
---|
2454 | }
|
---|
2455 |
|
---|
2456 | enum {
|
---|
2457 | c_opt_config_file = 0,
|
---|
2458 | d_opt_decode_url,
|
---|
2459 | h_opt_home_httpd,
|
---|
2460 | IF_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
|
---|
2461 | IF_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,)
|
---|
2462 | IF_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,)
|
---|
2463 | IF_FEATURE_HTTPD_SETUID( u_opt_setuid ,)
|
---|
2464 | p_opt_port ,
|
---|
2465 | p_opt_inetd ,
|
---|
2466 | p_opt_foreground,
|
---|
2467 | p_opt_verbose ,
|
---|
2468 | OPT_CONFIG_FILE = 1 << c_opt_config_file,
|
---|
2469 | OPT_DECODE_URL = 1 << d_opt_decode_url,
|
---|
2470 | OPT_HOME_HTTPD = 1 << h_opt_home_httpd,
|
---|
2471 | OPT_ENCODE_URL = IF_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
|
---|
2472 | OPT_REALM = IF_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0,
|
---|
2473 | OPT_MD5 = IF_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0,
|
---|
2474 | OPT_SETUID = IF_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0,
|
---|
2475 | OPT_PORT = 1 << p_opt_port,
|
---|
2476 | OPT_INETD = 1 << p_opt_inetd,
|
---|
2477 | OPT_FOREGROUND = 1 << p_opt_foreground,
|
---|
2478 | OPT_VERBOSE = 1 << p_opt_verbose,
|
---|
2479 | };
|
---|
2480 |
|
---|
2481 |
|
---|
2482 | int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
2483 | int httpd_main(int argc UNUSED_PARAM, char **argv)
|
---|
2484 | {
|
---|
2485 | int server_socket = server_socket; /* for gcc */
|
---|
2486 | unsigned opt;
|
---|
2487 | char *url_for_decode;
|
---|
2488 | IF_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
|
---|
2489 | IF_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
|
---|
2490 | IF_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
|
---|
2491 | IF_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
|
---|
2492 |
|
---|
2493 | INIT_G();
|
---|
2494 |
|
---|
2495 | #if ENABLE_LOCALE_SUPPORT
|
---|
2496 | /* Undo busybox.c: we want to speak English in http (dates etc) */
|
---|
2497 | setlocale(LC_TIME, "C");
|
---|
2498 | #endif
|
---|
2499 |
|
---|
2500 | home_httpd = xrealloc_getcwd_or_warn(NULL);
|
---|
2501 | /* -v counts, -i implies -f */
|
---|
2502 | opt_complementary = "vv:if";
|
---|
2503 | /* We do not "absolutize" path given by -h (home) opt.
|
---|
2504 | * If user gives relative path in -h,
|
---|
2505 | * $SCRIPT_FILENAME will not be set. */
|
---|
2506 | opt = getopt32(argv, "c:d:h:"
|
---|
2507 | IF_FEATURE_HTTPD_ENCODE_URL_STR("e:")
|
---|
2508 | IF_FEATURE_HTTPD_BASIC_AUTH("r:")
|
---|
2509 | IF_FEATURE_HTTPD_AUTH_MD5("m:")
|
---|
2510 | IF_FEATURE_HTTPD_SETUID("u:")
|
---|
2511 | "p:ifv",
|
---|
2512 | &opt_c_configFile, &url_for_decode, &home_httpd
|
---|
2513 | IF_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
|
---|
2514 | IF_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
|
---|
2515 | IF_FEATURE_HTTPD_AUTH_MD5(, &pass)
|
---|
2516 | IF_FEATURE_HTTPD_SETUID(, &s_ugid)
|
---|
2517 | , &bind_addr_or_port
|
---|
2518 | , &verbose
|
---|
2519 | );
|
---|
2520 | if (opt & OPT_DECODE_URL) {
|
---|
2521 | fputs(percent_decode_in_place(url_for_decode, /*strict:*/ 0), stdout);
|
---|
2522 | return 0;
|
---|
2523 | }
|
---|
2524 | #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
|
---|
2525 | if (opt & OPT_ENCODE_URL) {
|
---|
2526 | fputs(encodeString(url_for_encode), stdout);
|
---|
2527 | return 0;
|
---|
2528 | }
|
---|
2529 | #endif
|
---|
2530 | #if ENABLE_FEATURE_HTTPD_AUTH_MD5
|
---|
2531 | if (opt & OPT_MD5) {
|
---|
2532 | char salt[sizeof("$1$XXXXXXXX")];
|
---|
2533 | salt[0] = '$';
|
---|
2534 | salt[1] = '1';
|
---|
2535 | salt[2] = '$';
|
---|
2536 | crypt_make_salt(salt + 3, 4);
|
---|
2537 | puts(pw_encrypt(pass, salt, /*cleanup:*/ 0));
|
---|
2538 | return 0;
|
---|
2539 | }
|
---|
2540 | #endif
|
---|
2541 | #if ENABLE_FEATURE_HTTPD_SETUID
|
---|
2542 | if (opt & OPT_SETUID) {
|
---|
2543 | xget_uidgid(&ugid, s_ugid);
|
---|
2544 | }
|
---|
2545 | #endif
|
---|
2546 |
|
---|
2547 | #if !BB_MMU
|
---|
2548 | if (!(opt & OPT_FOREGROUND)) {
|
---|
2549 | bb_daemonize_or_rexec(0, argv); /* don't change current directory */
|
---|
2550 | }
|
---|
2551 | #endif
|
---|
2552 |
|
---|
2553 | xchdir(home_httpd);
|
---|
2554 | if (!(opt & OPT_INETD)) {
|
---|
2555 | signal(SIGCHLD, SIG_IGN);
|
---|
2556 | server_socket = openServer();
|
---|
2557 | #if ENABLE_FEATURE_HTTPD_SETUID
|
---|
2558 | /* drop privileges */
|
---|
2559 | if (opt & OPT_SETUID) {
|
---|
2560 | if (ugid.gid != (gid_t)-1) {
|
---|
2561 | if (setgroups(1, &ugid.gid) == -1)
|
---|
2562 | bb_perror_msg_and_die("setgroups");
|
---|
2563 | xsetgid(ugid.gid);
|
---|
2564 | }
|
---|
2565 | xsetuid(ugid.uid);
|
---|
2566 | }
|
---|
2567 | #endif
|
---|
2568 | }
|
---|
2569 |
|
---|
2570 | #if 0
|
---|
2571 | /* User can do it himself: 'env - PATH="$PATH" httpd'
|
---|
2572 | * We don't do it because we don't want to screw users
|
---|
2573 | * which want to do
|
---|
2574 | * 'env - VAR1=val1 VAR2=val2 httpd'
|
---|
2575 | * and have VAR1 and VAR2 values visible in their CGIs.
|
---|
2576 | * Besides, it is also smaller. */
|
---|
2577 | {
|
---|
2578 | char *p = getenv("PATH");
|
---|
2579 | /* env strings themself are not freed, no need to xstrdup(p): */
|
---|
2580 | clearenv();
|
---|
2581 | if (p)
|
---|
2582 | putenv(p - 5);
|
---|
2583 | // if (!(opt & OPT_INETD))
|
---|
2584 | // setenv_long("SERVER_PORT", ???);
|
---|
2585 | }
|
---|
2586 | #endif
|
---|
2587 |
|
---|
2588 | parse_conf(DEFAULT_PATH_HTTPD_CONF, FIRST_PARSE);
|
---|
2589 | if (!(opt & OPT_INETD))
|
---|
2590 | signal(SIGHUP, sighup_handler);
|
---|
2591 |
|
---|
2592 | xfunc_error_retval = 0;
|
---|
2593 | if (opt & OPT_INETD)
|
---|
2594 | mini_httpd_inetd();
|
---|
2595 | #if BB_MMU
|
---|
2596 | if (!(opt & OPT_FOREGROUND))
|
---|
2597 | bb_daemonize(0); /* don't change current directory */
|
---|
2598 | mini_httpd(server_socket); /* never returns */
|
---|
2599 | #else
|
---|
2600 | mini_httpd_nommu(server_socket, argc, argv); /* never returns */
|
---|
2601 | #endif
|
---|
2602 | /* return 0; */
|
---|
2603 | }
|
---|