source: branches/3.2/mindi-busybox/networking/httpd_ssi.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 6 years ago
  • Update mindi-busybox to 1.21.1
  • Property svn:eol-style set to native
File size: 4.1 KB
Line 
1/*
2 * Copyright (c) 2009 Denys Vlasenko <vda.linux@googlemail.com>
3 *
4 * Licensed under GPLv2, see file LICENSE in this source tree.
5 */
6
7/*
8 * This program is a CGI application. It processes server-side includes:
9 * <!--#include file="file.html" -->
10 *
11 * Usage: put these lines in httpd.conf:
12 *
13 * *.html:/bin/httpd_ssi
14 * *.htm:/bin/httpd_ssi
15 */
16
17/* Build a-la
18i486-linux-uclibc-gcc \
19-static -static-libgcc \
20-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 \
21-Wall -Wshadow -Wwrite-strings -Wundef -Wstrict-prototypes -Werror \
22-Wold-style-definition -Wdeclaration-after-statement -Wno-pointer-sign \
23-Wmissing-prototypes -Wmissing-declarations \
24-Os -fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer \
25-ffunction-sections -fdata-sections -fno-guess-branch-probability \
26-funsigned-char \
27-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1 \
28-march=i386 -mpreferred-stack-boundary=2 \
29-Wl,-Map -Wl,link.map -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
30httpd_ssi.c -o httpd_ssi
31*/
32
33/* Size (i386, static uclibc, approximate):
34 * text    data     bss     dec     hex filename
35 * 9487     160   68552   78199   13177 httpd_ssi
36 *
37 * Note: it wouldn't be too hard to get rid of stdio and strdup,
38 * (especially that fgets() mangles NULs...)
39 */
40
41#include <sys/types.h>
42#include <sys/stat.h>
43#include <errno.h>
44#include <fcntl.h>
45#include <stdint.h>
46#include <stdlib.h>
47#include <string.h>
48#include <unistd.h>
49#include <stdio.h>
50#include <dirent.h>
51#include <time.h>
52
53static char* skip_whitespace(char *s)
54{
55    while (*s == ' ' || *s == '\t') ++s;
56
57    return s;
58}
59
60static char line[64 * 1024];
61
62static void process_includes(const char *filename)
63{
64    int curdir_fd;
65    char *end;
66    FILE *fp = fopen(filename, "r");
67    if (!fp)
68        exit(1);
69
70    /* Ensure that nested includes are relative:
71     * if we include a/1.htm and it includes b/2.htm,
72     * we need to include a/b/2.htm, not b/2.htm
73     */
74    curdir_fd = -1;
75    end = strrchr(filename, '/');
76    if (end) {
77        curdir_fd = open(".", O_RDONLY);
78        /* *end = '\0' would mishandle "/file.htm" */
79        end[1] = '\0';
80        chdir(filename);
81    }
82
83#define INCLUDE "<!--#include"
84    while (fgets(line, sizeof(line), fp)) {
85        unsigned preceding_len;
86        char *include_directive;
87
88        include_directive = strstr(line, INCLUDE);
89        if (!include_directive) {
90            fputs(line, stdout);
91            continue;
92        }
93        preceding_len = include_directive - line;
94        if (memchr(line, '\"', preceding_len)
95         || memchr(line, '\'', preceding_len)
96        ) {
97            /* INCLUDE string may be inside "str" or 'str',
98             * ignore it */
99            fputs(line, stdout);
100            continue;
101        }
102        /* Small bug: we accept #includefile="file" too */
103        include_directive = skip_whitespace(include_directive + sizeof(INCLUDE)-1);
104        if (strncmp(include_directive, "file=\"", 6) != 0) {
105            /* "<!--#include virtual=..."? - not supported */
106            fputs(line, stdout);
107            continue;
108        }
109        include_directive += 6; /* now it points to file name */
110        end = strchr(include_directive, '\"');
111        if (!end) {
112            fputs(line, stdout);
113            continue;
114        }
115        /* We checked that this is a valid include directive */
116
117        /* Print everything before directive */
118        if (preceding_len) {
119            line[preceding_len] = '\0';
120            fputs(line, stdout);
121        }
122        /* Save everything after directive */
123        *end++ = '\0';
124        end = strchr(end, '>');
125        if (end)
126            end = strdup(end + 1);
127
128        /* FIXME:
129         * (1) are relative paths with /../ etc ok?
130         * (2) what to do with absolute paths?
131         * are they relative to doc root or to real root?
132         */
133        process_includes(include_directive);
134
135        /* Print everything after directive */
136        if (end) {
137            fputs(end, stdout);
138            free(end);
139        }
140    }
141    if (curdir_fd >= 0)
142        fchdir(curdir_fd);
143    fclose(fp);
144}
145
146int main(int argc, char *argv[])
147{
148    if (!argv[1])
149        return 1;
150
151    /* Seen from busybox.net's Apache:
152     * HTTP/1.1 200 OK
153     * Date: Thu, 10 Sep 2009 18:23:28 GMT
154     * Server: Apache
155     * Accept-Ranges: bytes
156     * Connection: close
157     * Content-Type: text/html
158     */
159    fputs(
160        /* "Date: Thu, 10 Sep 2009 18:23:28 GMT\r\n" */
161        /* "Server: Apache\r\n" */
162        /* "Accept-Ranges: bytes\r\n" - do we really accept bytes?! */
163        "Connection: close\r\n"
164        "Content-Type: text/html\r\n"
165        "\r\n",
166        stdout
167    );
168    process_includes(argv[1]);
169    return 0;
170}
Note: See TracBrowser for help on using the repository browser.