+++ /dev/null
-/*
- * uhttpd - Tiny single-threaded httpd - CGI handler
- *
- * Copyright (C) 2010-2012 Jo-Philipp Wich <xm@subsignal.org>
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "uhttpd.h"
-#include "uhttpd-utils.h"
-#include "uhttpd-cgi.h"
-
-
-static bool
-uh_cgi_header_parse(struct http_response *res, char *buf, int len, int *off)
-{
- char *bufptr = NULL;
- char *hdrname = NULL;
- int hdrcount = 0;
- int pos = 0;
-
- if (((bufptr = strfind(buf, len, "\r\n\r\n", 4)) != NULL) ||
- ((bufptr = strfind(buf, len, "\n\n", 2)) != NULL))
- {
- *off = (int)(bufptr - buf) + ((bufptr[0] == '\r') ? 4 : 2);
-
- memset(res, 0, sizeof(*res));
-
- res->statuscode = 200;
- res->statusmsg = "OK";
-
- bufptr = &buf[0];
-
- for (pos = 0; pos < *off; pos++)
- {
- if (!hdrname && (buf[pos] == ':'))
- {
- buf[pos++] = 0;
-
- if ((pos < len) && (buf[pos] == ' '))
- pos++;
-
- if (pos < len)
- {
- hdrname = bufptr;
- bufptr = &buf[pos];
- }
- }
-
- else if ((buf[pos] == '\r') || (buf[pos] == '\n'))
- {
- if (! hdrname)
- break;
-
- buf[pos++] = 0;
-
- if ((pos < len) && (buf[pos] == '\n'))
- pos++;
-
- if (pos <= len)
- {
- if ((hdrcount+1) < array_size(res->headers))
- {
- if (!strcasecmp(hdrname, "Status"))
- {
- res->statuscode = atoi(bufptr);
-
- if (res->statuscode < 100)
- res->statuscode = 200;
-
- if (((bufptr = strchr(bufptr, ' ')) != NULL) &&
- (&bufptr[1] != 0))
- {
- res->statusmsg = &bufptr[1];
- }
-
- D("CGI: HTTP/1.x %03d %s\n",
- res->statuscode, res->statusmsg);
- }
- else
- {
- D("CGI: HTTP: %s: %s\n", hdrname, bufptr);
-
- res->headers[hdrcount++] = hdrname;
- res->headers[hdrcount++] = bufptr;
- }
-
- bufptr = &buf[pos];
- hdrname = NULL;
- }
- else
- {
- return false;
- }
- }
- }
- }
-
- return true;
- }
-
- return false;
-}
-
-static char * uh_cgi_header_lookup(struct http_response *res,
- const char *hdrname)
-{
- int i;
-
- foreach_header(i, res->headers)
- {
- if (!strcasecmp(res->headers[i], hdrname))
- return res->headers[i+1];
- }
-
- return NULL;
-}
-
-static void uh_cgi_shutdown(struct uh_cgi_state *state)
-{
- free(state);
-}
-
-static bool uh_cgi_socket_cb(struct client *cl)
-{
- int i, len, blen, hdroff;
- char buf[UH_LIMIT_MSGHEAD];
-
- struct uh_cgi_state *state = (struct uh_cgi_state *)cl->priv;
- struct http_response *res = &cl->response;
- struct http_request *req = &cl->request;
-
- /* there is unread post data waiting */
- while (state->content_length > 0)
- {
- /* remaining data in http head buffer ... */
- if (cl->httpbuf.len > 0)
- {
- len = min(state->content_length, cl->httpbuf.len);
-
- D("CGI: Child(%d) feed %d HTTP buffer bytes\n", cl->proc.pid, len);
-
- memcpy(buf, cl->httpbuf.ptr, len);
-
- cl->httpbuf.len -= len;
- cl->httpbuf.ptr +=len;
- }
-
- /* read it from socket ... */
- else
- {
- len = uh_tcp_recv(cl, buf,
- min(state->content_length, sizeof(buf)));
-
- if ((len < 0) && ((errno == EAGAIN) || (errno == EWOULDBLOCK)))
- break;
-
- D("CGI: Child(%d) feed %d/%d TCP socket bytes\n",
- cl->proc.pid, len, min(state->content_length, sizeof(buf)));
- }
-
- if (len)
- state->content_length -= len;
- else
- state->content_length = 0;
-
- /* ... write to CGI process */
- len = uh_raw_send(cl->wpipe.fd, buf, len,
- cl->server->conf->script_timeout);
-
- /* explicit EOF notification for the child */
- if (state->content_length <= 0)
- uh_ufd_remove(&cl->wpipe);
- }
-
- /* try to read data from child */
- while ((len = uh_raw_recv(cl->rpipe.fd, buf, state->header_sent
- ? sizeof(buf) : state->httpbuf.len, -1)) > 0)
- {
- /* we have not pushed out headers yet, parse input */
- if (!state->header_sent)
- {
- /* try to parse header ... */
- memcpy(state->httpbuf.ptr, buf, len);
- state->httpbuf.len -= len;
- state->httpbuf.ptr += len;
-
- blen = state->httpbuf.ptr - state->httpbuf.buf;
-
- if (uh_cgi_header_parse(res, state->httpbuf.buf, blen, &hdroff))
- {
- /* write status */
- ensure_out(uh_http_sendf(cl, NULL,
- "%s %03d %s\r\n"
- "Connection: close\r\n",
- http_versions[req->version],
- res->statuscode, res->statusmsg));
-
- /* add Content-Type if no Location or Content-Type */
- if (!uh_cgi_header_lookup(res, "Location") &&
- !uh_cgi_header_lookup(res, "Content-Type"))
- {
- ensure_out(uh_http_send(cl, NULL,
- "Content-Type: text/plain\r\n", -1));
- }
-
- /* if request was HTTP 1.1 we'll respond chunked */
- if ((req->version > UH_HTTP_VER_1_0) &&
- !uh_cgi_header_lookup(res, "Transfer-Encoding"))
- {
- ensure_out(uh_http_send(cl, NULL,
- "Transfer-Encoding: chunked\r\n", -1));
- }
-
- /* write headers from CGI program */
- foreach_header(i, res->headers)
- {
- ensure_out(uh_http_sendf(cl, NULL, "%s: %s\r\n",
- res->headers[i], res->headers[i+1]));
- }
-
- /* terminate header */
- ensure_out(uh_http_send(cl, NULL, "\r\n", -1));
-
- state->header_sent = true;
-
- /* push out remaining head buffer */
- if (hdroff < blen)
- {
- D("CGI: Child(%d) relaying %d rest bytes\n",
- cl->proc.pid, blen - hdroff);
-
- ensure_out(uh_http_send(cl, req,
- state->httpbuf.buf + hdroff,
- blen - hdroff));
- }
- }
-
- /* ... failed and head buffer exceeded */
- else if (!state->httpbuf.len)
- {
- /* 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_out(uh_http_sendf(cl, NULL,
- "%s 200 OK\r\n"
- "Content-Type: text/plain\r\n"
- "%s\r\n",
- http_versions[req->version],
- (req->version > UH_HTTP_VER_1_0)
- ? "Transfer-Encoding: chunked\r\n" : ""
- ));
-
- state->header_sent = true;
-
- D("CGI: Child(%d) relaying %d invalid bytes\n",
- cl->proc.pid, len);
-
- ensure_out(uh_http_send(cl, req, buf, len));
- }
- }
- else
- {
- /* headers complete, pass through buffer to socket */
- D("CGI: Child(%d) relaying %d normal bytes\n", cl->proc.pid, len);
- ensure_out(uh_http_send(cl, req, buf, len));
- }
- }
-
- /* got EOF or read error from child */
- if ((len == 0) ||
- ((errno != EAGAIN) && (errno != EWOULDBLOCK) && (len == -1)))
- {
- D("CGI: Child(%d) presumed dead [%s]\n", cl->proc.pid, strerror(errno));
-
- goto out;
- }
-
- return true;
-
-out:
- if (!state->header_sent)
- {
- if (cl->timeout.pending)
- uh_http_sendhf(cl, 502, "Bad Gateway",
- "The CGI process did not produce any response\n");
- else
- uh_http_sendhf(cl, 504, "Gateway Timeout",
- "The CGI process took too long to produce a "
- "response\n");
- }
- else
- {
- uh_http_send(cl, req, "", 0);
- }
-
- uh_cgi_shutdown(state);
- return false;
-}
-
-bool uh_cgi_request(struct client *cl, struct path_info *pi,
- struct interpreter *ip)
-{
- int i;
-
- int rfd[2] = { 0, 0 };
- int wfd[2] = { 0, 0 };
-
- pid_t child;
-
- struct uh_cgi_state *state;
- struct http_request *req = &cl->request;
-
- /* allocate state */
- if (!(state = malloc(sizeof(*state))))
- {
- uh_http_sendhf(cl, 500, "Internal Server Error", "Out of memory");
- return false;
- }
-
- /* spawn pipes for me->child, child->me */
- if ((pipe(rfd) < 0) || (pipe(wfd) < 0))
- {
- if (rfd[0] > 0) close(rfd[0]);
- if (rfd[1] > 0) close(rfd[1]);
- if (wfd[0] > 0) close(wfd[0]);
- if (wfd[1] > 0) close(wfd[1]);
-
- uh_http_sendhf(cl, 500, "Internal Server Error",
- "Failed to create pipe: %s\n", strerror(errno));
-
- return false;
- }
-
- /* fork off child process */
- switch ((child = fork()))
- {
- /* oops */
- case -1:
- uh_http_sendhf(cl, 500, "Internal Server Error",
- "Failed to fork child: %s\n", strerror(errno));
-
- return false;
-
- /* exec child */
- case 0:
-#ifdef DEBUG
- sleep(atoi(getenv("UHTTPD_SLEEP_ON_FORK") ?: "0"));
-#endif
-
- /* do not leak parent epoll descriptor */
- uloop_done();
-
- /* close loose pipe ends */
- close(rfd[0]);
- close(wfd[1]);
-
- /* patch stdout and stdin to pipes */
- dup2(rfd[1], 1);
- dup2(wfd[0], 0);
-
- /* avoid leaking our pipe into child-child processes */
- fd_cloexec(rfd[1]);
- fd_cloexec(wfd[0]);
-
- /* check for regular, world-executable file _or_ interpreter */
- if (((pi->stat.st_mode & S_IFREG) &&
- (pi->stat.st_mode & S_IXOTH)) || (ip != NULL))
- {
- /* build environment */
- clearenv();
-
- /* common information */
- setenv("GATEWAY_INTERFACE", "CGI/1.1", 1);
- setenv("SERVER_SOFTWARE", "uHTTPd", 1);
- setenv("PATH", "/sbin:/usr/sbin:/bin:/usr/bin", 1);
-
-#ifdef HAVE_TLS
- /* https? */
- if (cl->tls)
- setenv("HTTPS", "on", 1);
-#endif
-
- /* addresses */
- setenv("SERVER_NAME", sa_straddr(&cl->servaddr), 1);
- setenv("SERVER_ADDR", sa_straddr(&cl->servaddr), 1);
- setenv("SERVER_PORT", sa_strport(&cl->servaddr), 1);
- setenv("REMOTE_HOST", sa_straddr(&cl->peeraddr), 1);
- setenv("REMOTE_ADDR", sa_straddr(&cl->peeraddr), 1);
- setenv("REMOTE_PORT", sa_strport(&cl->peeraddr), 1);
-
- /* path information */
- setenv("SCRIPT_NAME", pi->name, 1);
- setenv("SCRIPT_FILENAME", pi->phys, 1);
- setenv("DOCUMENT_ROOT", pi->root, 1);
- setenv("QUERY_STRING", pi->query ? pi->query : "", 1);
-
- if (pi->info)
- setenv("PATH_INFO", pi->info, 1);
-
- /* REDIRECT_STATUS, php-cgi wants it */
- switch (req->redirect_status)
- {
- case 404:
- setenv("REDIRECT_STATUS", "404", 1);
- break;
-
- default:
- setenv("REDIRECT_STATUS", "200", 1);
- break;
- }
-
- /* http version */
- setenv("SERVER_PROTOCOL", http_versions[req->version], 1);
-
- /* request method */
- setenv("REQUEST_METHOD", http_methods[req->method], 1);
-
- /* request url */
- setenv("REQUEST_URI", req->url, 1);
-
- /* remote user */
- if (req->realm)
- setenv("REMOTE_USER", req->realm->user, 1);
-
- /* request message headers */
- foreach_header(i, req->headers)
- {
- if (!strcasecmp(req->headers[i], "Accept"))
- setenv("HTTP_ACCEPT", req->headers[i+1], 1);
-
- else if (!strcasecmp(req->headers[i], "Accept-Charset"))
- setenv("HTTP_ACCEPT_CHARSET", req->headers[i+1], 1);
-
- else if (!strcasecmp(req->headers[i], "Accept-Encoding"))
- setenv("HTTP_ACCEPT_ENCODING", req->headers[i+1], 1);
-
- else if (!strcasecmp(req->headers[i], "Accept-Language"))
- setenv("HTTP_ACCEPT_LANGUAGE", req->headers[i+1], 1);
-
- else if (!strcasecmp(req->headers[i], "Authorization"))
- setenv("HTTP_AUTHORIZATION", req->headers[i+1], 1);
-
- else if (!strcasecmp(req->headers[i], "Connection"))
- setenv("HTTP_CONNECTION", req->headers[i+1], 1);
-
- else if (!strcasecmp(req->headers[i], "Cookie"))
- setenv("HTTP_COOKIE", req->headers[i+1], 1);
-
- else if (!strcasecmp(req->headers[i], "Host"))
- setenv("HTTP_HOST", req->headers[i+1], 1);
-
- else if (!strcasecmp(req->headers[i], "Referer"))
- setenv("HTTP_REFERER", req->headers[i+1], 1);
-
- else if (!strcasecmp(req->headers[i], "User-Agent"))
- setenv("HTTP_USER_AGENT", req->headers[i+1], 1);
-
- else if (!strcasecmp(req->headers[i], "Content-Type"))
- setenv("CONTENT_TYPE", req->headers[i+1], 1);
-
- else if (!strcasecmp(req->headers[i], "Content-Length"))
- setenv("CONTENT_LENGTH", req->headers[i+1], 1);
- }
-
-
- /* execute child code ... */
- if (chdir(pi->root))
- perror("chdir()");
-
- if (ip != NULL)
- execl(ip->path, ip->path, pi->phys, NULL);
- else
- execl(pi->phys, pi->phys, NULL);
-
- /* in case it fails ... */
- printf("Status: 500 Internal Server Error\r\n\r\n"
- "Unable to launch the requested CGI program:\n"
- " %s: %s\n", ip ? ip->path : pi->phys, strerror(errno));
- }
-
- /* 403 */
- else
- {
- printf("Status: 403 Forbidden\r\n\r\n"
- "Access to this resource is forbidden\n");
- }
-
- close(wfd[0]);
- close(rfd[1]);
- exit(0);
-
- break;
-
- /* parent; handle I/O relaying */
- default:
- memset(state, 0, sizeof(*state));
-
- cl->rpipe.fd = rfd[0];
- cl->wpipe.fd = wfd[1];
- cl->proc.pid = child;
-
- /* make pipe non-blocking */
- fd_nonblock(cl->rpipe.fd);
- fd_nonblock(cl->wpipe.fd);
-
- /* close unneeded pipe ends */
- close(rfd[1]);
- close(wfd[0]);
-
- D("CGI: Child(%d) created: rfd(%d) wfd(%d)\n", child, rfd[0], wfd[1]);
-
- state->httpbuf.ptr = state->httpbuf.buf;
- state->httpbuf.len = sizeof(state->httpbuf.buf);
-
- state->content_length = cl->httpbuf.len;
-
- /* find content length */
- if (req->method == UH_HTTP_MSG_POST)
- {
- foreach_header(i, req->headers)
- {
- if (!strcasecmp(req->headers[i], "Content-Length"))
- {
- state->content_length = atoi(req->headers[i+1]);
- break;
- }
- }
- }
-
- cl->cb = uh_cgi_socket_cb;
- cl->priv = state;
-
- break;
- }
-
- return true;
-}
projects / openwrt / openwrt.git / blobdiff