/* * Copyright (c) 2009 Denys Vlasenko <vda.linux@googlemail.com> * * Licensed under GPLv2, see file LICENSE in this source tree. */ /* * This program is a CGI application. It processes server-side includes: * <!--#include file="file.html" --> * * Usage: put these lines in httpd.conf: * * *.html:/bin/httpd_ssi * *.htm:/bin/httpd_ssi */ /* Build a-la i486-linux-uclibc-gcc \ -static -static-libgcc \ -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 \ -Wall -Wshadow -Wwrite-strings -Wundef -Wstrict-prototypes -Werror \ -Wold-style-definition -Wdeclaration-after-statement -Wno-pointer-sign \ -Wmissing-prototypes -Wmissing-declarations \ -Os -fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer \ -ffunction-sections -fdata-sections -fno-guess-branch-probability \ -funsigned-char \ -falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1 \ -march=i386 -mpreferred-stack-boundary=2 \ -Wl,-Map -Wl,link.map -Wl,--warn-common -Wl,--sort-common -Wl,--gc-sections \ httpd_ssi.c -o httpd_ssi */ /* Size (i386, static uclibc, approximate): * text data bss dec hex filename * 9487 160 68552 78199 13177 httpd_ssi * * Note: it wouldn't be too hard to get rid of stdio and strdup, * (especially that fgets() mangles NULs...) */ #include <sys/types.h> #include <sys/stat.h> #include <errno.h> #include <fcntl.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <stdio.h> #include <dirent.h> #include <time.h> static char* skip_whitespace(char *s) { while (*s == ' ' || *s == '\t') ++s; return s; } static char line[64 * 1024]; static void process_includes(const char *filename) { int curdir_fd; char *end; FILE *fp = fopen(filename, "r"); if (!fp) exit(1); /* Ensure that nested includes are relative: * if we include a/1.htm and it includes b/2.htm, * we need to include a/b/2.htm, not b/2.htm */ curdir_fd = -1; end = strrchr(filename, '/'); if (end) { curdir_fd = open(".", O_RDONLY); /* *end = '\0' would mishandle "/file.htm" */ end[1] = '\0'; chdir(filename); } #define INCLUDE "<!--#include" while (fgets(line, sizeof(line), fp)) { unsigned preceding_len; char *include_directive; include_directive = strstr(line, INCLUDE); if (!include_directive) { fputs(line, stdout); continue; } preceding_len = include_directive - line; if (memchr(line, '\"', preceding_len) || memchr(line, '\'', preceding_len) ) { /* INCLUDE string may be inside "str" or 'str', * ignore it */ fputs(line, stdout); continue; } /* Small bug: we accept #includefile="file" too */ include_directive = skip_whitespace(include_directive + sizeof(INCLUDE)-1); if (strncmp(include_directive, "file=\"", 6) != 0) { /* "<!--#include virtual=..."? - not supported */ fputs(line, stdout); continue; } include_directive += 6; /* now it points to file name */ end = strchr(include_directive, '\"'); if (!end) { fputs(line, stdout); continue; } /* We checked that this is a valid include directive */ /* Print everything before directive */ if (preceding_len) { line[preceding_len] = '\0'; fputs(line, stdout); } /* Save everything after directive */ *end++ = '\0'; end = strchr(end, '>'); if (end) end = strdup(end + 1); /* FIXME: * (1) are relative paths with /../ etc ok? * (2) what to do with absolute paths? * are they relative to doc root or to real root? */ process_includes(include_directive); /* Print everything after directive */ if (end) { fputs(end, stdout); free(end); } } if (curdir_fd >= 0) fchdir(curdir_fd); fclose(fp); } int main(int argc, char *argv[]) { if (!argv[1]) return 1; /* Seen from busybox.net's Apache: * HTTP/1.1 200 OK * Date: Thu, 10 Sep 2009 18:23:28 GMT * Server: Apache * Accept-Ranges: bytes * Connection: close * Content-Type: text/html */ fputs( /* "Date: Thu, 10 Sep 2009 18:23:28 GMT\r\n" */ /* "Server: Apache\r\n" */ /* "Accept-Ranges: bytes\r\n" - do we really accept bytes?! */ "Connection: close\r\n" "Content-Type: text/html\r\n" "\r\n", stdout ); process_includes(argv[1]); return 0; }