networking/httpd_ssi.c

   1 /*
   2  * Copyright (c) 2009 Denys Vlasenko <vda.linux@googlemail.com>
   3  *
   4  * Licensed under GPLv2, see file LICENSE in this tarball for details.
   5  */
   6
   7 /*
   8  * This program is a CGI application. It processes server-side includes:
   9  * <!--#include file="file.html" -->
  10  */
  11
  12 /* Build a-la
  13 i486-linux-uclibc-gcc \
  14 -static -static-libgcc \
  15 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 \
  16 -Wall -Wshadow -Wwrite-strings -Wundef -Wstrict-prototypes -Werror \
  17 -Wold-style-definition -Wdeclaration-after-statement -Wno-pointer-sign \
  18 -Wmissing-prototypes -Wmissing-declarations \
  19 -Os -fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer \
  20 -ffunction-sections -fdata-sections -fno-guess-branch-probability \
  21 -funsigned-char \
  22 -falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1 \
  23 -march=i386 -mpreferred-stack-boundary=2 \
  24 -Wl,-Map -Wl,link.map -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \
  25 httpd_ssi.c -o httpd_ssi
  26 */
  27
  28 /* Size (i386, static uclibc, approximate):
  29    text    data     bss     dec     hex filename
  30    8931     164   68552   77647   12f4f httpd_ssi
  31 */
  32
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <errno.h>
  36 #include <stdint.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40 #include <stdio.h>
  41 #include <dirent.h>
  42 #include <time.h>
  43
  44 static char line[64 * 1024];
  45
  46 /*
  47  * Currently only handles directives which are alone on the line
  48  */
  49 static void process_includes(const char *filename)
  50 {
  51         FILE *fp = fopen(filename, "r");
  52         if (!fp)
  53                 exit(1);
  54
  55 #define INCLUDE "<!--#include file=\""
  56         while (fgets(line, sizeof(line), fp)) {
  57                 char *closing_dq;
  58
  59                 /* FIXME: output text leading to INCLUDE first */
  60                 if (strncmp(line, INCLUDE, sizeof(INCLUDE)-1) != 0
  61                  || (closing_dq = strchr(line + sizeof(INCLUDE)-1, '"')) == NULL
  62                 /* or strstr(line + sizeof(INCLUDE)-1, "\" -->")? */
  63                 ) {
  64                         fputs(line, stdout);
  65                         continue;
  66                 }
  67                 *closing_dq = '\0';
  68                 /* FIXME: (1) are relative paths ok?
  69                  * (2) if we include a/1.htm and it includes b/2.htm,
  70                  * do we need to insert a/b/2.htm or b/2.htm?
  71                  * IOW, do we need to "cd $dirname"?
  72                  */
  73                 process_includes(line + sizeof(INCLUDE)-1);
  74                 /* FIXME: this should be the tail of line after --> */
  75                 putchar('\n');
  76         }
  77 }
  78
  79 int main(int argc, char *argv[])
  80 {
  81         if (!argv[1])
  82                 return 1;
  83
  84         /* Seen from busybox.net's Apache:
  85          * HTTP/1.1 200 OK
  86          * Date: Thu, 10 Sep 2009 18:23:28 GMT
  87          * Server: Apache
  88          * Accept-Ranges: bytes
  89          * Connection: close
  90          * Content-Type: text/html
  91          */
  92         printf(
  93                 /* "Date: Thu, 10 Sep 2009 18:23:28 GMT\r\n" */
  94                 /* "Server: Apache\r\n" */
  95                 /* "Accept-Ranges: bytes\r\n" - do we really accept bytes?! */
  96                 "Connection: close\r\n"
  97                 "Content-Type: text/html\r\n"
  98                 "\r\n"
  99         );
 100         process_includes(argv[1]);
 101         return 0;
 102 }