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-rw-r--r--package/uhttpd/src/uhttpd-cgi.c561
1 files changed, 561 insertions, 0 deletions
diff --git a/package/uhttpd/src/uhttpd-cgi.c b/package/uhttpd/src/uhttpd-cgi.c
new file mode 100644
index 0000000000..5565197ca7
--- /dev/null
+++ b/package/uhttpd/src/uhttpd-cgi.c
@@ -0,0 +1,561 @@
+/*
+ * uhttpd - Tiny single-threaded httpd - CGI handler
+ *
+ * Copyright (C) 2010 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 struct http_response * uh_cgi_header_parse(char *buf, int len, int *off)
+{
+ char *bufptr = NULL;
+ char *hdrname = NULL;
+ int hdrcount = 0;
+ int pos = 0;
+
+ static struct http_response res;
+
+
+ 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 < len; 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') )
+ {
+ buf[pos++] = 0;
+
+ if( ! hdrname )
+ break;
+
+ 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];
+ }
+ else
+ {
+ res.headers[hdrcount++] = hdrname;
+ res.headers[hdrcount++] = bufptr;
+ }
+
+ bufptr = &buf[pos];
+ hdrname = NULL;
+ }
+ else
+ {
+ return NULL;
+ }
+ }
+ }
+ }
+
+ return &res;
+ }
+
+ return NULL;
+}
+
+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 int uh_cgi_error_500(struct client *cl, struct http_request *req, const char *message)
+{
+ if( uh_http_sendf(cl, NULL,
+ "HTTP/%.1f 500 Internal Server Error\r\n"
+ "Content-Type: text/plain\r\n%s\r\n",
+ req->version,
+ (req->version > 1.0)
+ ? "Transfer-Encoding: chunked\r\n" : ""
+ ) >= 0
+ ) {
+ return uh_http_send(cl, req, message, -1);
+ }
+
+ return -1;
+}
+
+
+void uh_cgi_request(struct client *cl, struct http_request *req, struct path_info *pi)
+{
+ int i, hdroff, bufoff;
+ int hdrlen = 0;
+ int buflen = 0;
+ int fd_max = 0;
+ int content_length = 0;
+ int header_sent = 0;
+
+ int rfd[2] = { 0, 0 };
+ int wfd[2] = { 0, 0 };
+
+ char buf[UH_LIMIT_MSGHEAD];
+ char hdr[UH_LIMIT_MSGHEAD];
+
+ pid_t child;
+
+ fd_set reader;
+ fd_set writer;
+
+ struct sigaction sa;
+ struct timeval timeout;
+ struct http_response *res;
+
+
+ /* spawn pipes for me->child, child->me */
+ if( (pipe(rfd) < 0) || (pipe(wfd) < 0) )
+ {
+ uh_http_sendhf(cl, 500, "Internal Server Error",
+ "Failed to create pipe: %s", strerror(errno));
+
+ 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]);
+
+ return;
+ }
+
+ /* fork off child process */
+ switch( (child = fork()) )
+ {
+ /* oops */
+ case -1:
+ uh_http_sendhf(cl, 500, "Internal Server Error",
+ "Failed to fork child: %s", strerror(errno));
+ return;
+
+ /* exec child */
+ case 0:
+ /* restore SIGTERM */
+ sa.sa_flags = 0;
+ sa.sa_handler = SIG_DFL;
+ sigemptyset(&sa.sa_mask);
+ sigaction(SIGTERM, &sa, NULL);
+
+ /* close loose pipe ends */
+ close(rfd[0]);
+ close(wfd[1]);
+
+ /* patch stdout and stdin to pipes */
+ dup2(rfd[1], 1);
+ dup2(wfd[0], 0);
+
+ /* check for regular, world-executable file */
+ if( (pi->stat.st_mode & S_IFREG) &&
+ (pi->stat.st_mode & S_IXOTH)
+ ) {
+ /* 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);
+
+
+ /* http version */
+ if( req->version > 1.0 )
+ setenv("SERVER_PROTOCOL", "HTTP/1.1", 1);
+ else
+ setenv("SERVER_PROTOCOL", "HTTP/1.0", 1);
+
+ /* request method */
+ switch( req->method )
+ {
+ case UH_HTTP_MSG_GET:
+ setenv("REQUEST_METHOD", "GET", 1);
+ break;
+
+ case UH_HTTP_MSG_HEAD:
+ setenv("REQUEST_METHOD", "HEAD", 1);
+ break;
+
+ case UH_HTTP_MSG_POST:
+ setenv("REQUEST_METHOD", "POST", 1);
+ break;
+ }
+
+ /* 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()");
+
+ 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",
+ 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:
+ /* close unneeded pipe ends */
+ close(rfd[1]);
+ close(wfd[0]);
+
+ /* max watch fd */
+ fd_max = max(rfd[0], wfd[1]) + 1;
+
+ /* find content length */
+ if( req->method == UH_HTTP_MSG_POST )
+ {
+ foreach_header(i, req->headers)
+ {
+ if( ! strcasecmp(req->headers[i], "Content-Length") )
+ {
+ content_length = atoi(req->headers[i+1]);
+ break;
+ }
+ }
+ }
+
+
+ memset(hdr, 0, sizeof(hdr));
+
+#define ensure(x) \
+ do { if( x < 0 ) goto out; } while(0)
+
+ /* I/O loop, watch our pipe ends and dispatch child reads/writes from/to socket */
+ while( 1 )
+ {
+ FD_ZERO(&reader);
+ FD_ZERO(&writer);
+
+ FD_SET(rfd[0], &reader);
+ FD_SET(wfd[1], &writer);
+
+ timeout.tv_sec = 15;
+ timeout.tv_usec = 0;
+
+ /* wait until we can read or write or both */
+ if( select(fd_max, &reader, (content_length > -1) ? &writer : NULL, NULL, &timeout) > 0 )
+ {
+ /* ready to write to cgi program */
+ if( FD_ISSET(wfd[1], &writer) )
+ {
+ /* there is unread post data waiting */
+ if( content_length > 0 )
+ {
+ /* read it from socket ... */
+ if( (buflen = uh_tcp_recv(cl, buf, min(content_length, sizeof(buf)))) > 0 )
+ {
+ /* ... and write it to child's stdin */
+ if( write(wfd[1], buf, buflen) < 0 )
+ perror("write()");
+
+ content_length -= buflen;
+ }
+
+ /* unexpected eof! */
+ else
+ {
+ if( write(wfd[1], "", 0) < 0 )
+ perror("write()");
+
+ content_length = 0;
+ }
+ }
+
+ /* there is no more post data, close pipe to child's stdin */
+ else if( content_length > -1 )
+ {
+ close(wfd[1]);
+ content_length = -1;
+ }
+ }
+
+ /* ready to read from cgi program */
+ if( FD_ISSET(rfd[0], &reader) )
+ {
+ /* read data from child ... */
+ if( (buflen = read(rfd[0], buf, sizeof(buf))) > 0 )
+ {
+ /* we have not pushed out headers yet, parse input */
+ if( ! header_sent )
+ {
+ /* head buffer not full and no end yet */
+ if( hdrlen < sizeof(hdr) )
+ {
+ bufoff = min(buflen, sizeof(hdr) - hdrlen);
+ memcpy(&hdr[hdrlen], buf, bufoff);
+ hdrlen += bufoff;
+ }
+ else
+ {
+ bufoff = 0;
+ }
+
+
+ /* try to parse header ... */
+ if( (res = uh_cgi_header_parse(hdr, hdrlen, &hdroff)) != NULL )
+ {
+ /* write status */
+ ensure(uh_http_sendf(cl, NULL,
+ "HTTP/%.1f %03d %s\r\n"
+ "Connection: close\r\n",
+ 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(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 > 1.0) &&
+ !uh_cgi_header_lookup(res, "Transfer-Encoding")
+ ) {
+ ensure(uh_http_send(cl, NULL,
+ "Transfer-Encoding: chunked\r\n", -1));
+ }
+
+ /* write headers from CGI program */
+ foreach_header(i, res->headers)
+ {
+ ensure(uh_http_sendf(cl, NULL, "%s: %s\r\n",
+ 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;
+ }
+ }
+ }
+
+ /* no activity for 15 seconds... looks dead */
+ else
+ {
+ ensure(uh_http_sendhf(cl, 504, "Gateway Timeout",
+ "The CGI script took too long to produce a response"));
+
+ break;
+ }
+ }
+
+ out:
+ close(rfd[0]);
+ close(wfd[1]);
+
+ if( !kill(child, 0) )
+ kill(child, SIGTERM);
+
+ break;
+ }
+}
+
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