606 lines
14 KiB
C
606 lines
14 KiB
C
/*
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* uhttpd - Tiny single-threaded httpd - CGI handler
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*
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* Copyright (C) 2010-2011 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 < *off; 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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if (! hdrname)
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break;
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buf[pos++] = 0;
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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) &&
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(&bufptr[1] != 0))
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{
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res.statusmsg = &bufptr[1];
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}
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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,
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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,
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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" : "") >= 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,
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struct path_info *pi, struct interpreter *ip)
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{
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int i, hdroff, bufoff, rv;
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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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sigset_t ss;
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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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/* unblock signals */
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sigemptyset(&ss);
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sigprocmask(SIG_SETMASK, &ss, NULL);
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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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/* avoid leaking our pipe into child-child processes */
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fd_cloexec(rfd[1]);
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fd_cloexec(wfd[0]);
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/* check for regular, world-executable file _or_ interpreter */
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if (((pi->stat.st_mode & S_IFREG) &&
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(pi->stat.st_mode & S_IXOTH)) || (ip != NULL))
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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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/* REDIRECT_STATUS, php-cgi wants it */
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switch (req->redirect_status)
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{
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case 404:
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setenv("REDIRECT_STATUS", "404", 1);
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break;
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default:
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setenv("REDIRECT_STATUS", "200", 1);
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break;
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}
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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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if (ip != NULL)
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execl(ip->path, ip->path, pi->phys, NULL);
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else
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execl(pi->phys, pi->phys, NULL);
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/* in case it fails ... */
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printf("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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ip ? ip->path : pi->phys, strerror(errno));
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}
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/* 403 */
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else
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{
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printf("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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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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/* 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 = (header_sent < 1) ? cl->server->conf->script_timeout : 3;
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timeout.tv_usec = 0;
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ensure_out(rv = select_intr(fd_max, &reader,
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(content_length > -1)
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? &writer : NULL,
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NULL, &timeout));
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/* timeout */
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if (rv == 0)
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{
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ensure_out(kill(child, 0));
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}
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/* wait until we can read or write or both */
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else if (rv > 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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ensure_out(buflen = uh_tcp_recv(cl, buf,
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min(content_length, sizeof(buf))));
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if (buflen > 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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/* 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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/* 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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/* 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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/* 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_out(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));
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/* 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_out(uh_http_send(cl, NULL,
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"Content-Type: text/plain\r\n", -1));
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}
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/* if request was HTTP 1.1 we'll respond chunked */
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if( (req->version > 1.0) &&
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!uh_cgi_header_lookup(res, "Transfer-Encoding")
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) {
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ensure_out(uh_http_send(cl, NULL,
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"Transfer-Encoding: chunked\r\n", -1));
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}
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/* write headers from CGI program */
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foreach_header(i, res->headers)
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{
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ensure_out(uh_http_sendf(cl, NULL, "%s: %s\r\n",
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res->headers[i], res->headers[i+1]));
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}
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/* terminate header */
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ensure_out(uh_http_send(cl, NULL, "\r\n", -1));
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/* push out remaining head buffer */
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if (hdroff < hdrlen)
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ensure_out(uh_http_send(cl, req, &hdr[hdroff], hdrlen - hdroff));
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}
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/* ... failed and head buffer exceeded */
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else if (hdrlen >= sizeof(hdr))
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{
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ensure_out(uh_cgi_error_500(cl, req,
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"The CGI program generated an invalid response:\n\n"));
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ensure_out(uh_http_send(cl, req, hdr, hdrlen));
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}
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/* ... failed but free buffer space, try again */
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else
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{
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continue;
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}
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/* push out remaining read buffer */
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if (bufoff < buflen)
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ensure_out(uh_http_send(cl, req, &buf[bufoff], buflen - bufoff));
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header_sent = 1;
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continue;
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}
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/* headers complete, pass through buffer to socket */
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ensure_out(uh_http_send(cl, req, buf, buflen));
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}
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/* looks like eof from child */
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else
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{
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/* cgi script did not output useful stuff at all */
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if (!header_sent)
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{
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/* I would do this ...
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*
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* uh_cgi_error_500(cl, req,
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* "The CGI program generated an "
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* "invalid response:\n\n");
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*
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* ... but in order to stay as compatible as possible,
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* treat whatever we got as text/plain response and
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* build the required headers here.
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*/
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ensure_out(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_out(uh_http_send(cl, req, hdr, hdrlen));
|
|
}
|
|
|
|
/* send final chunk if we're in chunked transfer mode */
|
|
ensure_out(uh_http_send(cl, req, "", 0));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* timeout exceeded or interrupted by SIGCHLD */
|
|
else
|
|
{
|
|
if ((errno != EINTR) && ! header_sent)
|
|
{
|
|
ensure_out(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_out(uh_http_send(cl, req, "", 0));
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
out:
|
|
close(rfd[0]);
|
|
close(wfd[1]);
|
|
|
|
if (!kill(child, 0))
|
|
{
|
|
kill(child, SIGTERM);
|
|
waitpid(child, NULL, 0);
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|