Denys Vlasenko | db4a676 | 2009-09-10 21:24:45 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2009 Denys Vlasenko <vda.linux@googlemail.com> |
| 3 | * |
Denys Vlasenko | 0ef64bd | 2010-08-16 20:14:46 +0200 | [diff] [blame] | 4 | * Licensed under GPLv2, see file LICENSE in this source tree. |
Denys Vlasenko | db4a676 | 2009-09-10 21:24:45 +0200 | [diff] [blame] | 5 | */ |
| 6 | |
| 7 | /* |
| 8 | * This program is a CGI application. It processes server-side includes: |
| 9 | * <!--#include file="file.html" --> |
Denys Vlasenko | 56573cb | 2009-09-10 21:27:39 +0200 | [diff] [blame] | 10 | * |
| 11 | * Usage: put these lines in httpd.conf: |
| 12 | * |
| 13 | * *.html:/bin/httpd_ssi |
| 14 | * *.htm:/bin/httpd_ssi |
Denys Vlasenko | db4a676 | 2009-09-10 21:24:45 +0200 | [diff] [blame] | 15 | */ |
| 16 | |
| 17 | /* Build a-la |
| 18 | i486-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 \ |
| 30 | httpd_ssi.c -o httpd_ssi |
| 31 | */ |
| 32 | |
| 33 | /* Size (i386, static uclibc, approximate): |
Denys Vlasenko | 772c2db | 2009-09-13 17:38:15 +0200 | [diff] [blame] | 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 | */ |
Denys Vlasenko | db4a676 | 2009-09-10 21:24:45 +0200 | [diff] [blame] | 40 | |
| 41 | #include <sys/types.h> |
| 42 | #include <sys/stat.h> |
| 43 | #include <errno.h> |
Denys Vlasenko | 772c2db | 2009-09-13 17:38:15 +0200 | [diff] [blame] | 44 | #include <fcntl.h> |
Denys Vlasenko | db4a676 | 2009-09-10 21:24:45 +0200 | [diff] [blame] | 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 | |
Denys Vlasenko | 772c2db | 2009-09-13 17:38:15 +0200 | [diff] [blame] | 53 | static char* skip_whitespace(char *s) |
| 54 | { |
| 55 | while (*s == ' ' || *s == '\t') ++s; |
| 56 | |
| 57 | return s; |
| 58 | } |
| 59 | |
Denys Vlasenko | db4a676 | 2009-09-10 21:24:45 +0200 | [diff] [blame] | 60 | static char line[64 * 1024]; |
| 61 | |
Denys Vlasenko | db4a676 | 2009-09-10 21:24:45 +0200 | [diff] [blame] | 62 | static void process_includes(const char *filename) |
| 63 | { |
Denys Vlasenko | 772c2db | 2009-09-13 17:38:15 +0200 | [diff] [blame] | 64 | int curdir_fd; |
| 65 | char *end; |
Denys Vlasenko | db4a676 | 2009-09-10 21:24:45 +0200 | [diff] [blame] | 66 | FILE *fp = fopen(filename, "r"); |
| 67 | if (!fp) |
| 68 | exit(1); |
| 69 | |
Denys Vlasenko | 772c2db | 2009-09-13 17:38:15 +0200 | [diff] [blame] | 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 | } |
Denys Vlasenko | db4a676 | 2009-09-10 21:24:45 +0200 | [diff] [blame] | 82 | |
Denys Vlasenko | 772c2db | 2009-09-13 17:38:15 +0200 | [diff] [blame] | 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) { |
Denys Vlasenko | db4a676 | 2009-09-10 21:24:45 +0200 | [diff] [blame] | 90 | fputs(line, stdout); |
| 91 | continue; |
| 92 | } |
Denys Vlasenko | 772c2db | 2009-09-13 17:38:15 +0200 | [diff] [blame] | 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 | |
Denys Vlasenko | 56573cb | 2009-09-10 21:27:39 +0200 | [diff] [blame] | 128 | /* FIXME: |
| 129 | * (1) are relative paths with /../ etc ok? |
Denys Vlasenko | 772c2db | 2009-09-13 17:38:15 +0200 | [diff] [blame] | 130 | * (2) what to do with absolute paths? |
| 131 | * are they relative to doc root or to real root? |
Denys Vlasenko | db4a676 | 2009-09-10 21:24:45 +0200 | [diff] [blame] | 132 | */ |
Denys Vlasenko | 772c2db | 2009-09-13 17:38:15 +0200 | [diff] [blame] | 133 | process_includes(include_directive); |
| 134 | |
| 135 | /* Print everything after directive */ |
| 136 | if (end) { |
| 137 | fputs(end, stdout); |
| 138 | free(end); |
| 139 | } |
Denys Vlasenko | db4a676 | 2009-09-10 21:24:45 +0200 | [diff] [blame] | 140 | } |
Denys Vlasenko | 772c2db | 2009-09-13 17:38:15 +0200 | [diff] [blame] | 141 | if (curdir_fd >= 0) |
| 142 | fchdir(curdir_fd); |
| 143 | fclose(fp); |
Denys Vlasenko | db4a676 | 2009-09-10 21:24:45 +0200 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | int 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 | */ |
Denys Vlasenko | 772c2db | 2009-09-13 17:38:15 +0200 | [diff] [blame] | 159 | fputs( |
Denys Vlasenko | db4a676 | 2009-09-10 21:24:45 +0200 | [diff] [blame] | 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" |
Denys Vlasenko | 772c2db | 2009-09-13 17:38:15 +0200 | [diff] [blame] | 165 | "\r\n", |
| 166 | stdout |
Denys Vlasenko | db4a676 | 2009-09-10 21:24:45 +0200 | [diff] [blame] | 167 | ); |
| 168 | process_includes(argv[1]); |
| 169 | return 0; |
| 170 | } |