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569 lines
13 KiB
C
569 lines
13 KiB
C
/*
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* uhttpd - Tiny single-threaded httpd - CGI handler
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*
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* Copyright (C) 2010 Jo-Philipp Wich <xm@subsignal.org>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "uhttpd.h"
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#include "uhttpd-utils.h"
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#include "uhttpd-cgi.h"
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static struct http_response * uh_cgi_header_parse(char *buf, int len, int *off)
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{
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char *bufptr = NULL;
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char *hdrname = NULL;
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int hdrcount = 0;
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int pos = 0;
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static struct http_response res;
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if( ((bufptr = strfind(buf, len, "\r\n\r\n", 4)) != NULL) ||
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((bufptr = strfind(buf, len, "\n\n", 2)) != NULL)
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) {
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*off = (int)(bufptr - buf) + ((bufptr[0] == '\r') ? 4 : 2);
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memset(&res, 0, sizeof(res));
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res.statuscode = 200;
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res.statusmsg = "OK";
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bufptr = &buf[0];
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for( pos = 0; pos < len; pos++ )
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{
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if( !hdrname && (buf[pos] == ':') )
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{
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buf[pos++] = 0;
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if( (pos < len) && (buf[pos] == ' ') )
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pos++;
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if( pos < len )
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{
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hdrname = bufptr;
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bufptr = &buf[pos];
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}
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}
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else if( (buf[pos] == '\r') || (buf[pos] == '\n') )
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{
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buf[pos++] = 0;
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if( ! hdrname )
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break;
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if( (pos < len) && (buf[pos] == '\n') )
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pos++;
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if( pos < len )
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{
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if( (hdrcount + 1) < array_size(res.headers) )
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{
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if( ! strcasecmp(hdrname, "Status") )
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{
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res.statuscode = atoi(bufptr);
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if( res.statuscode < 100 )
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res.statuscode = 200;
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if( ((bufptr = strchr(bufptr, ' ')) != NULL) && (&bufptr[1] != 0) )
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res.statusmsg = &bufptr[1];
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}
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else
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{
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res.headers[hdrcount++] = hdrname;
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res.headers[hdrcount++] = bufptr;
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}
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bufptr = &buf[pos];
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hdrname = NULL;
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}
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else
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{
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return NULL;
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}
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}
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}
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}
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return &res;
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}
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return NULL;
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}
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static char * uh_cgi_header_lookup(struct http_response *res, const char *hdrname)
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{
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int i;
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foreach_header(i, res->headers)
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{
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if( ! strcasecmp(res->headers[i], hdrname) )
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return res->headers[i+1];
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}
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return NULL;
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}
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static int uh_cgi_error_500(struct client *cl, struct http_request *req, const char *message)
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{
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if( uh_http_sendf(cl, NULL,
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"HTTP/%.1f 500 Internal Server Error\r\n"
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"Content-Type: text/plain\r\n%s\r\n",
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req->version,
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(req->version > 1.0)
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? "Transfer-Encoding: chunked\r\n" : ""
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) >= 0
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) {
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return uh_http_send(cl, req, message, -1);
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}
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return -1;
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}
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void uh_cgi_request(struct client *cl, struct http_request *req, struct path_info *pi)
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{
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int i, hdroff, bufoff;
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int hdrlen = 0;
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int buflen = 0;
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int fd_max = 0;
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int content_length = 0;
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int header_sent = 0;
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int rfd[2] = { 0, 0 };
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int wfd[2] = { 0, 0 };
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char buf[UH_LIMIT_MSGHEAD];
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char hdr[UH_LIMIT_MSGHEAD];
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pid_t child;
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fd_set reader;
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fd_set writer;
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struct sigaction sa;
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struct timeval timeout;
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struct http_response *res;
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/* spawn pipes for me->child, child->me */
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if( (pipe(rfd) < 0) || (pipe(wfd) < 0) )
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{
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uh_http_sendhf(cl, 500, "Internal Server Error",
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"Failed to create pipe: %s", strerror(errno));
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if( rfd[0] > 0 ) close(rfd[0]);
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if( rfd[1] > 0 ) close(rfd[1]);
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if( wfd[0] > 0 ) close(wfd[0]);
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if( wfd[1] > 0 ) close(wfd[1]);
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return;
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}
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/* fork off child process */
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switch( (child = fork()) )
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{
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/* oops */
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case -1:
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uh_http_sendhf(cl, 500, "Internal Server Error",
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"Failed to fork child: %s", strerror(errno));
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return;
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/* exec child */
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case 0:
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/* restore SIGTERM */
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sa.sa_flags = 0;
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sa.sa_handler = SIG_DFL;
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sigemptyset(&sa.sa_mask);
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sigaction(SIGTERM, &sa, NULL);
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/* close loose pipe ends */
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close(rfd[0]);
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close(wfd[1]);
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/* patch stdout and stdin to pipes */
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dup2(rfd[1], 1);
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dup2(wfd[0], 0);
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/* check for regular, world-executable file */
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if( (pi->stat.st_mode & S_IFREG) &&
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(pi->stat.st_mode & S_IXOTH)
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) {
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/* build environment */
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clearenv();
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/* common information */
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setenv("GATEWAY_INTERFACE", "CGI/1.1", 1);
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setenv("SERVER_SOFTWARE", "uHTTPd", 1);
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setenv("PATH", "/sbin:/usr/sbin:/bin:/usr/bin", 1);
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#ifdef HAVE_TLS
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/* https? */
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if( cl->tls )
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setenv("HTTPS", "on", 1);
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#endif
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/* addresses */
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setenv("SERVER_NAME", sa_straddr(&cl->servaddr), 1);
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setenv("SERVER_ADDR", sa_straddr(&cl->servaddr), 1);
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setenv("SERVER_PORT", sa_strport(&cl->servaddr), 1);
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setenv("REMOTE_HOST", sa_straddr(&cl->peeraddr), 1);
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setenv("REMOTE_ADDR", sa_straddr(&cl->peeraddr), 1);
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setenv("REMOTE_PORT", sa_strport(&cl->peeraddr), 1);
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/* path information */
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setenv("SCRIPT_NAME", pi->name, 1);
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setenv("SCRIPT_FILENAME", pi->phys, 1);
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setenv("DOCUMENT_ROOT", pi->root, 1);
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setenv("QUERY_STRING", pi->query ? pi->query : "", 1);
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if( pi->info )
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setenv("PATH_INFO", pi->info, 1);
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/* http version */
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if( req->version > 1.0 )
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setenv("SERVER_PROTOCOL", "HTTP/1.1", 1);
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else
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setenv("SERVER_PROTOCOL", "HTTP/1.0", 1);
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/* request method */
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switch( req->method )
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{
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case UH_HTTP_MSG_GET:
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setenv("REQUEST_METHOD", "GET", 1);
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break;
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case UH_HTTP_MSG_HEAD:
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setenv("REQUEST_METHOD", "HEAD", 1);
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break;
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case UH_HTTP_MSG_POST:
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setenv("REQUEST_METHOD", "POST", 1);
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break;
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}
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/* request url */
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setenv("REQUEST_URI", req->url, 1);
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/* remote user */
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if( req->realm )
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setenv("REMOTE_USER", req->realm->user, 1);
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/* request message headers */
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foreach_header(i, req->headers)
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{
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if( ! strcasecmp(req->headers[i], "Accept") )
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setenv("HTTP_ACCEPT", req->headers[i+1], 1);
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else if( ! strcasecmp(req->headers[i], "Accept-Charset") )
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setenv("HTTP_ACCEPT_CHARSET", req->headers[i+1], 1);
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else if( ! strcasecmp(req->headers[i], "Accept-Encoding") )
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setenv("HTTP_ACCEPT_ENCODING", req->headers[i+1], 1);
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else if( ! strcasecmp(req->headers[i], "Accept-Language") )
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setenv("HTTP_ACCEPT_LANGUAGE", req->headers[i+1], 1);
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else if( ! strcasecmp(req->headers[i], "Authorization") )
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setenv("HTTP_AUTHORIZATION", req->headers[i+1], 1);
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else if( ! strcasecmp(req->headers[i], "Connection") )
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setenv("HTTP_CONNECTION", req->headers[i+1], 1);
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else if( ! strcasecmp(req->headers[i], "Cookie") )
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setenv("HTTP_COOKIE", req->headers[i+1], 1);
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else if( ! strcasecmp(req->headers[i], "Host") )
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setenv("HTTP_HOST", req->headers[i+1], 1);
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else if( ! strcasecmp(req->headers[i], "Referer") )
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setenv("HTTP_REFERER", req->headers[i+1], 1);
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else if( ! strcasecmp(req->headers[i], "User-Agent") )
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setenv("HTTP_USER_AGENT", req->headers[i+1], 1);
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else if( ! strcasecmp(req->headers[i], "Content-Type") )
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setenv("CONTENT_TYPE", req->headers[i+1], 1);
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else if( ! strcasecmp(req->headers[i], "Content-Length") )
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setenv("CONTENT_LENGTH", req->headers[i+1], 1);
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}
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/* execute child code ... */
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if( chdir(pi->root) )
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perror("chdir()");
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execl(pi->phys, pi->phys, NULL);
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/* in case it fails ... */
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printf(
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"Status: 500 Internal Server Error\r\n\r\n"
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"Unable to launch the requested CGI program:\n"
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" %s: %s\n",
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pi->phys, strerror(errno)
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);
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}
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/* 403 */
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else
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{
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printf(
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"Status: 403 Forbidden\r\n\r\n"
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"Access to this resource is forbidden\n"
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);
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}
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close(wfd[0]);
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close(rfd[1]);
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exit(0);
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break;
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/* parent; handle I/O relaying */
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default:
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/* close unneeded pipe ends */
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close(rfd[1]);
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close(wfd[0]);
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/* max watch fd */
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fd_max = max(rfd[0], wfd[1]) + 1;
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/* find content length */
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if( req->method == UH_HTTP_MSG_POST )
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{
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foreach_header(i, req->headers)
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{
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if( ! strcasecmp(req->headers[i], "Content-Length") )
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{
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content_length = atoi(req->headers[i+1]);
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break;
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}
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}
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}
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memset(hdr, 0, sizeof(hdr));
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#define ensure(x) \
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do { if( x < 0 ) goto out; } while(0)
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/* I/O loop, watch our pipe ends and dispatch child reads/writes from/to socket */
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while( 1 )
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{
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FD_ZERO(&reader);
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FD_ZERO(&writer);
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FD_SET(rfd[0], &reader);
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FD_SET(wfd[1], &writer);
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timeout.tv_sec = cl->server->conf->script_timeout;
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timeout.tv_usec = 0;
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|
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/* wait until we can read or write or both */
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if( select(fd_max, &reader, (content_length > -1) ? &writer : NULL, NULL, &timeout) > 0 )
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{
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/* ready to write to cgi program */
|
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if( FD_ISSET(wfd[1], &writer) )
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{
|
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/* there is unread post data waiting */
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if( content_length > 0 )
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{
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/* read it from socket ... */
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if( (buflen = uh_tcp_recv(cl, buf, min(content_length, sizeof(buf)))) > 0 )
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{
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/* ... and write it to child's stdin */
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if( write(wfd[1], buf, buflen) < 0 )
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perror("write()");
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content_length -= buflen;
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}
|
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|
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/* unexpected eof! */
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else
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{
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if( write(wfd[1], "", 0) < 0 )
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perror("write()");
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content_length = 0;
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}
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}
|
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|
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/* there is no more post data, close pipe to child's stdin */
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else if( content_length > -1 )
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{
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close(wfd[1]);
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content_length = -1;
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}
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}
|
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|
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/* ready to read from cgi program */
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if( FD_ISSET(rfd[0], &reader) )
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{
|
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/* read data from child ... */
|
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if( (buflen = read(rfd[0], buf, sizeof(buf))) > 0 )
|
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{
|
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/* we have not pushed out headers yet, parse input */
|
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if( ! header_sent )
|
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{
|
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/* head buffer not full and no end yet */
|
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if( hdrlen < sizeof(hdr) )
|
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{
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bufoff = min(buflen, sizeof(hdr) - hdrlen);
|
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memcpy(&hdr[hdrlen], buf, bufoff);
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hdrlen += bufoff;
|
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}
|
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else
|
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{
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bufoff = 0;
|
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}
|
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|
|
|
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/* try to parse header ... */
|
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if( (res = uh_cgi_header_parse(hdr, hdrlen, &hdroff)) != NULL )
|
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{
|
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/* write status */
|
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ensure(uh_http_sendf(cl, NULL,
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"HTTP/%.1f %03d %s\r\n"
|
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"Connection: close\r\n",
|
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req->version, res->statuscode,
|
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res->statusmsg));
|
|
|
|
/* add Content-Type if no Location or Content-Type */
|
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if( !uh_cgi_header_lookup(res, "Location") &&
|
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!uh_cgi_header_lookup(res, "Content-Type")
|
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) {
|
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ensure(uh_http_send(cl, NULL,
|
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"Content-Type: text/plain\r\n", -1));
|
|
}
|
|
|
|
/* if request was HTTP 1.1 we'll respond chunked */
|
|
if( (req->version > 1.0) &&
|
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!uh_cgi_header_lookup(res, "Transfer-Encoding")
|
|
) {
|
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ensure(uh_http_send(cl, NULL,
|
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"Transfer-Encoding: chunked\r\n", -1));
|
|
}
|
|
|
|
/* write headers from CGI program */
|
|
foreach_header(i, res->headers)
|
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{
|
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ensure(uh_http_sendf(cl, NULL, "%s: %s\r\n",
|
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res->headers[i], res->headers[i+1]));
|
|
}
|
|
|
|
/* terminate header */
|
|
ensure(uh_http_send(cl, NULL, "\r\n", -1));
|
|
|
|
/* push out remaining head buffer */
|
|
if( hdroff < hdrlen )
|
|
ensure(uh_http_send(cl, req, &hdr[hdroff], hdrlen - hdroff));
|
|
}
|
|
|
|
/* ... failed and head buffer exceeded */
|
|
else if( hdrlen >= sizeof(hdr) )
|
|
{
|
|
ensure(uh_cgi_error_500(cl, req,
|
|
"The CGI program generated an invalid response:\n\n"));
|
|
|
|
ensure(uh_http_send(cl, req, hdr, hdrlen));
|
|
}
|
|
|
|
/* ... failed but free buffer space, try again */
|
|
else
|
|
{
|
|
continue;
|
|
}
|
|
|
|
/* push out remaining read buffer */
|
|
if( bufoff < buflen )
|
|
ensure(uh_http_send(cl, req, &buf[bufoff], buflen - bufoff));
|
|
|
|
header_sent = 1;
|
|
continue;
|
|
}
|
|
|
|
|
|
/* headers complete, pass through buffer to socket */
|
|
ensure(uh_http_send(cl, req, buf, buflen));
|
|
}
|
|
|
|
/* looks like eof from child */
|
|
else
|
|
{
|
|
/* cgi script did not output useful stuff at all */
|
|
if( ! header_sent )
|
|
{
|
|
/* I would do this ...
|
|
*
|
|
* uh_cgi_error_500(cl, req,
|
|
* "The CGI program generated an "
|
|
* "invalid response:\n\n");
|
|
*
|
|
* ... but in order to stay as compatible as possible,
|
|
* treat whatever we got as text/plain response and
|
|
* build the required headers here.
|
|
*/
|
|
|
|
ensure(uh_http_sendf(cl, NULL,
|
|
"HTTP/%.1f 200 OK\r\n"
|
|
"Content-Type: text/plain\r\n"
|
|
"%s\r\n",
|
|
req->version, (req->version > 1.0)
|
|
? "Transfer-Encoding: chunked\r\n" : ""
|
|
));
|
|
|
|
ensure(uh_http_send(cl, req, hdr, hdrlen));
|
|
}
|
|
|
|
/* send final chunk if we're in chunked transfer mode */
|
|
ensure(uh_http_send(cl, req, "", 0));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* timeout exceeded or interrupted by SIGCHLD */
|
|
else
|
|
{
|
|
if( (errno != EINTR) && ! header_sent )
|
|
{
|
|
ensure(uh_http_sendhf(cl, 504, "Gateway Timeout",
|
|
"The CGI script took too long to produce "
|
|
"a response"));
|
|
}
|
|
|
|
/* send final chunk if we're in chunked transfer mode */
|
|
ensure(uh_http_send(cl, req, "", 0));
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
close(rfd[0]);
|
|
close(wfd[1]);
|
|
|
|
if( !kill(child, 0) )
|
|
kill(child, SIGTERM);
|
|
|
|
break;
|
|
}
|
|
}
|
|
|