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