[package] uhttpd:

	- rewrite large parts of the server, use uloop event driven structure
	- support concurrent requests and make the upper limit configurable
	- implement initial version of HTTP-to-ubus JSON proxy and session.* namespace
	- add compile time support for debug information
	- code style changes
	- bump package revision

git-svn-id: svn://svn.openwrt.org/openwrt/trunk/package/uhttpd/src@31931 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 377 insertions, 415 deletions

diff --git a/uhttpd-cgi.c b/uhttpd-cgi.c
index f852125..2f7ea7a 100644
--- a/uhttpd-cgi.c
+++ b/uhttpd-cgi.c
@@ -1,7 +1,7 @@
 /*
  * uhttpd - Tiny single-threaded httpd - CGI handler
  *
- *   Copyright (C) 2010-2011 Jo-Philipp Wich <xm@subsignal.org>
+ *   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.
@@ -20,25 +20,24 @@
 #include "uhttpd-utils.h"
 #include "uhttpd-cgi.h"
 
-static struct http_response * uh_cgi_header_parse(char *buf, int len, int *off)
+
+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;
 
-	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));
+		memset(res, 0, sizeof(*res));
 
-		res.statuscode = 200;
-		res.statusmsg  = "OK";
+		res->statuscode = 200;
+		res->statusmsg  = "OK";
 
 		bufptr = &buf[0];
 
@@ -70,25 +69,30 @@ static struct http_response * uh_cgi_header_parse(char *buf, int len, int *off)
 
 				if (pos <= len)
 				{
-					if ((hdrcount + 1) < array_size(res.headers))
+					if ((hdrcount+1) < array_size(res->headers))
 					{
 						if (!strcasecmp(hdrname, "Status"))
 						{
-							res.statuscode = atoi(bufptr);
+							res->statuscode = atoi(bufptr);
 
-							if (res.statuscode < 100)
-								res.statuscode = 200;
+							if (res->statuscode < 100)
+								res->statuscode = 200;
 
 							if (((bufptr = strchr(bufptr, ' ')) != NULL) &&
 								(&bufptr[1] != 0))
 							{
-								res.statusmsg = &bufptr[1];
+								res->statusmsg = &bufptr[1];
 							}
+
+							D("CGI: HTTP/1.x %03d %s\n",
+							  res->statuscode, res->statusmsg);
 						}
 						else
 						{
-							res.headers[hdrcount++] = hdrname;
-							res.headers[hdrcount++] = bufptr;
+							D("CGI: HTTP: %s: %s\n", hdrname, bufptr);
+
+							res->headers[hdrcount++] = hdrname;
+							res->headers[hdrcount++] = bufptr;
 						}
 
 						bufptr = &buf[pos];
@@ -96,16 +100,16 @@ static struct http_response * uh_cgi_header_parse(char *buf, int len, int *off)
 					}
 					else
 					{
-						return NULL;
+						return false;
 					}
 				}
 			}
 		}
 
-		return &res;
+		return true;
 	}
 
-	return NULL;
+	return false;
 }
 
 static char * uh_cgi_header_lookup(struct http_response *res,
@@ -122,485 +126,443 @@ static char * uh_cgi_header_lookup(struct http_response *res,
 	return NULL;
 }
 
-static int uh_cgi_error_500(struct client *cl, struct http_request *req,
-							const char *message)
+static void uh_cgi_shutdown(struct uh_cgi_state *state)
 {
-	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;
+	close(state->rfd);
+	close(state->wfd);
+	free(state);
 }
 
-
-void uh_cgi_request(struct client *cl, struct http_request *req,
-					struct path_info *pi, struct interpreter *ip)
+static bool uh_cgi_socket_cb(struct client *cl)
 {
-	int i, hdroff, bufoff, rv;
-	int hdrlen = 0;
-	int buflen = 0;
-	int fd_max = 0;
-	int content_length = 0;
-	int header_sent = 0;
+	int i, len, hdroff;
+	char buf[UH_LIMIT_MSGHEAD];
 
-	int rfd[2] = { 0, 0 };
-	int wfd[2] = { 0, 0 };
+	struct uh_cgi_state *state = (struct uh_cgi_state *)cl->priv;
+	struct http_response *res = &state->cl->response;
+	struct http_request *req = &state->cl->request;
 
-	char buf[UH_LIMIT_MSGHEAD];
-	char hdr[UH_LIMIT_MSGHEAD];
+	/* there is unread post data waiting */
+	while (state->content_length > 0)
+	{
+		/* remaining data in http head buffer ... */
+		if (state->cl->httpbuf.len > 0)
+		{
+			len = min(state->content_length, state->cl->httpbuf.len);
 
-	pid_t child;
+			D("CGI: Child(%d) feed %d HTTP buffer bytes\n",
+			  state->cl->proc.pid, len);
 
-	fd_set reader;
-	fd_set writer;
+			memcpy(buf, state->cl->httpbuf.ptr, len);
 
-	sigset_t ss;
+			state->cl->httpbuf.len -= len;
+			state->cl->httpbuf.ptr +=len;
+		}
 
-	struct sigaction sa;
-	struct timeval timeout;
-	struct http_response *res;
+		/* read it from socket ... */
+		else
+		{
+			len = uh_tcp_recv(state->cl, buf,
+							  min(state->content_length, sizeof(buf)));
 
+			if ((len < 0) && ((errno == EAGAIN) || (errno == EWOULDBLOCK)))
+				break;
 
-	/* 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));
+			D("CGI: Child(%d) feed %d/%d TCP socket bytes\n",
+			  state->cl->proc.pid, len,
+			  min(state->content_length, sizeof(buf)));
+		}
 
-		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]);
+		if (len)
+			state->content_length -= len;
+		else
+			state->content_length = 0;
 
-		return;
+		/* ... write to CGI process */
+		len = uh_raw_send(state->wfd, buf, len,
+						  cl->server->conf->script_timeout);
 	}
 
-	/* fork off child process */
-	switch ((child = fork()))
+	/* try to read data from child */
+	while ((len = uh_raw_recv(state->rfd, buf, sizeof(buf), -1)) > 0)
 	{
-		/* oops */
-		case -1:
-			uh_http_sendhf(cl, 500, "Internal Server Error",
-						   "Failed to fork child: %s", strerror(errno));
-			return;
-
-		/* exec child */
-		case 0:
-			/* unblock signals */
-			sigemptyset(&ss);
-			sigprocmask(SIG_SETMASK, &ss, NULL);
-
-			/* 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);
-
-			/* 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))
+		/* we have not pushed out headers yet, parse input */
+		if (!state->header_sent)
+		{
+			/* try to parse header ... */
+			memcpy(state->httpbuf, buf, len);
+
+			if (uh_cgi_header_parse(res, state->httpbuf, len, &hdroff))
 			{
-				/* build environment */
-				clearenv();
+				/* write status */
+				ensure_out(uh_http_sendf(state->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_out(uh_http_send(state->cl, NULL,
+						"Content-Type: text/plain\r\n", -1));
+				}
 
-				/* common information */
-				setenv("GATEWAY_INTERFACE", "CGI/1.1", 1);
-				setenv("SERVER_SOFTWARE", "uHTTPd", 1);
-				setenv("PATH", "/sbin:/usr/sbin:/bin:/usr/bin", 1);
+				/* if request was HTTP 1.1 we'll respond chunked */
+				if ((req->version > 1.0) &&
+					!uh_cgi_header_lookup(res, "Transfer-Encoding"))
+				{
+					ensure_out(uh_http_send(state->cl, NULL,
+						"Transfer-Encoding: chunked\r\n", -1));
+				}
 
-#ifdef HAVE_TLS
-				/* https? */
-				if (cl->tls)
-					setenv("HTTPS", "on", 1);
-#endif
+				/* write headers from CGI program */
+				foreach_header(i, res->headers)
+				{
+					ensure_out(uh_http_sendf(state->cl, NULL, "%s: %s\r\n",
+						res->headers[i], res->headers[i+1]));
+				}
+
+				/* terminate header */
+				ensure_out(uh_http_send(state->cl, NULL, "\r\n", -1));
 
-				/* 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)
+				state->header_sent = true;
+
+				/* push out remaining head buffer */
+				if (hdroff < len)
 				{
-					case 404:
-						setenv("REDIRECT_STATUS", "404", 1);
-						break;
+					D("CGI: Child(%d) relaying %d rest bytes\n",
+					  state->cl->proc.pid, len - hdroff);
 
-					default:
-						setenv("REDIRECT_STATUS", "200", 1);
-						break;
+					ensure_out(uh_http_send(state->cl, req,
+											&buf[hdroff], len - hdroff));
 				}
+			}
 
-				/* http version */
-				if (req->version > 1.0)
-					setenv("SERVER_PROTOCOL", "HTTP/1.1", 1);
-				else
-					setenv("SERVER_PROTOCOL", "HTTP/1.0", 1);
+			/* ... failed and head buffer exceeded */
+			else
+			{
+				/* 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(state->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" : ""
+				));
+
+				state->header_sent = true;
+
+				D("CGI: Child(%d) relaying %d invalid bytes\n",
+				  state->cl->proc.pid, len);
+
+				ensure_out(uh_http_send(state->cl, req, buf, len));
+			}
+		}
+		else
+		{
+			/* headers complete, pass through buffer to socket */
+			D("CGI: Child(%d) relaying %d normal bytes\n",
+			  state->cl->proc.pid, len);
 
-				/* request method */
-				switch (req->method)
-				{
-					case UH_HTTP_MSG_GET:
-						setenv("REQUEST_METHOD", "GET", 1);
-						break;
+			ensure_out(uh_http_send(state->cl, req, buf, len));
+		}
+	}
 
-					case UH_HTTP_MSG_HEAD:
-						setenv("REQUEST_METHOD", "HEAD", 1);
-						break;
+	/* child has been marked dead by timeout or child handler, bail out */
+	if (false && cl->dead)
+	{
+		D("CGI: Child(%d) is marked dead, returning\n", state->cl->proc.pid);
+		goto out;
+	}
 
-					case UH_HTTP_MSG_POST:
-						setenv("REQUEST_METHOD", "POST", 1);
-						break;
-				}
+	if ((len == 0) ||
+		((errno != EAGAIN) && (errno != EWOULDBLOCK) && (len == -1)))
+	{
+		D("CGI: Child(%d) presumed dead [%s]\n",
+		  state->cl->proc.pid, strerror(errno));
 
-				/* request url */
-				setenv("REQUEST_URI", req->url, 1);
+		goto out;
+	}
 
-				/* remote user */
-				if (req->realm)
-					setenv("REMOTE_USER", req->realm->user, 1);
+	return true;
 
-				/* request message headers */
-				foreach_header(i, req->headers)
-				{
-					if (!strcasecmp(req->headers[i], "Accept"))
-						setenv("HTTP_ACCEPT", req->headers[i+1], 1);
+out:
+	if (!state->header_sent)
+	{
+		if (state->cl->timeout.pending)
+			uh_http_sendhf(state->cl, 502, "Bad Gateway",
+						   "The CGI process did not produce any response\n");
+		else
+			uh_http_sendhf(state->cl, 504, "Gateway Timeout",
+						   "The CGI process took too long to produce a "
+						   "response\n");
+	}
+	else
+	{
+		uh_http_send(state->cl, req, "", 0);
+	}
 
-					else if (!strcasecmp(req->headers[i], "Accept-Charset"))
-						setenv("HTTP_ACCEPT_CHARSET", req->headers[i+1], 1);
+	uh_cgi_shutdown(state);
+	return false;
+}
 
-					else if (!strcasecmp(req->headers[i], "Accept-Encoding"))
-						setenv("HTTP_ACCEPT_ENCODING", req->headers[i+1], 1);
+bool uh_cgi_request(struct client *cl, struct path_info *pi,
+					struct interpreter *ip)
+{
+	int i;
 
-					else if (!strcasecmp(req->headers[i], "Accept-Language"))
-						setenv("HTTP_ACCEPT_LANGUAGE", req->headers[i+1], 1);
+	int rfd[2] = { 0, 0 };
+	int wfd[2] = { 0, 0 };
 
-					else if (!strcasecmp(req->headers[i], "Authorization"))
-						setenv("HTTP_AUTHORIZATION", req->headers[i+1], 1);
+	pid_t child;
 
-					else if (!strcasecmp(req->headers[i], "Connection"))
-						setenv("HTTP_CONNECTION", req->headers[i+1], 1);
+	struct uh_cgi_state *state;
+	struct http_request *req = &cl->request;
 
-					else if (!strcasecmp(req->headers[i], "Cookie"))
-						setenv("HTTP_COOKIE", req->headers[i+1], 1);
+	/* allocate state */
+	if (!(state = malloc(sizeof(*state))))
+	{
+		uh_http_sendhf(cl, 500, "Internal Server Error", "Out of memory");
+		return false;
+	}
 
-					else if (!strcasecmp(req->headers[i], "Host"))
-						setenv("HTTP_HOST", req->headers[i+1], 1);
+	/* 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]);
 
-					else if (!strcasecmp(req->headers[i], "Referer"))
-						setenv("HTTP_REFERER", req->headers[i+1], 1);
+		uh_http_sendhf(cl, 500, "Internal Server Error",
+						"Failed to create pipe: %s\n", strerror(errno));
+
+		return false;
+	}
 
-					else if (!strcasecmp(req->headers[i], "User-Agent"))
-						setenv("HTTP_USER_AGENT", req->headers[i+1], 1);
+	/* 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));
 
-					else if (!strcasecmp(req->headers[i], "Content-Type"))
-						setenv("CONTENT_TYPE", req->headers[i+1], 1);
+		return false;
 
-					else if (!strcasecmp(req->headers[i], "Content-Length"))
-						setenv("CONTENT_LENGTH", req->headers[i+1], 1);
-				}
+	/* exec child */
+	case 0:
+#ifdef DEBUG
+		sleep(atoi(getenv("UHTTPD_SLEEP_ON_FORK") ?: "0"));
+#endif
 
+		/* close loose pipe ends */
+		close(rfd[0]);
+		close(wfd[1]);
 
-				/* execute child code ... */
-				if (chdir(pi->root))
-					perror("chdir()");
+		/* patch stdout and stdin to pipes */
+		dup2(rfd[1], 1);
+		dup2(wfd[0], 0);
 
-				if (ip != NULL)
-					execl(ip->path, ip->path, pi->phys, NULL);
-				else
-					execl(pi->phys, pi->phys, NULL);
+		/* avoid leaking our pipe into child-child processes */
+		fd_cloexec(rfd[1]);
+		fd_cloexec(wfd[0]);
 
-				/* 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));
+		/* 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;
 			}
 
-			/* 403 */
+			/* 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)
 			{
-				printf("Status: 403 Forbidden\r\n\r\n"
-					   "Access to this resource is forbidden\n");
-			}
+				case UH_HTTP_MSG_GET:
+					setenv("REQUEST_METHOD", "GET", 1);
+					break;
 
-			close(wfd[0]);
-			close(rfd[1]);
-			exit(0);
+				case UH_HTTP_MSG_HEAD:
+					setenv("REQUEST_METHOD", "HEAD", 1);
+					break;
 
-			break;
+				case UH_HTTP_MSG_POST:
+					setenv("REQUEST_METHOD", "POST", 1);
+					break;
+			}
 
-		/* parent; handle I/O relaying */
-		default:
-			/* close unneeded pipe ends */
-			close(rfd[1]);
-			close(wfd[0]);
+			/* request url */
+			setenv("REQUEST_URI", req->url, 1);
 
-			/* max watch fd */
-			fd_max = max(rfd[0], wfd[1]) + 1;
+			/* remote user */
+			if (req->realm)
+				setenv("REMOTE_USER", req->realm->user, 1);
 
-			/* find content length */
-			if (req->method == UH_HTTP_MSG_POST)
+			/* request message headers */
+			foreach_header(i, req->headers)
 			{
-				foreach_header(i, req->headers)
-				{
-					if (!strcasecmp(req->headers[i], "Content-Length"))
-					{
-						content_length = atoi(req->headers[i+1]);
-						break;
-					}
-				}
-			}
+				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);
 
-			memset(hdr, 0, sizeof(hdr));
+				else if (!strcasecmp(req->headers[i], "Accept-Encoding"))
+					setenv("HTTP_ACCEPT_ENCODING", req->headers[i+1], 1);
 
-			/* I/O loop, watch our pipe ends and dispatch child reads/writes from/to socket */
-			while (1)
-			{
-				FD_ZERO(&reader);
-				FD_ZERO(&writer);
+				else if (!strcasecmp(req->headers[i], "Accept-Language"))
+					setenv("HTTP_ACCEPT_LANGUAGE", req->headers[i+1], 1);
 
-				FD_SET(rfd[0], &reader);
-				FD_SET(wfd[1], &writer);
+				else if (!strcasecmp(req->headers[i], "Authorization"))
+					setenv("HTTP_AUTHORIZATION", req->headers[i+1], 1);
 
-				timeout.tv_sec = (header_sent < 1) ? cl->server->conf->script_timeout : 3;
-				timeout.tv_usec = 0;
+				else if (!strcasecmp(req->headers[i], "Connection"))
+					setenv("HTTP_CONNECTION", req->headers[i+1], 1);
 
-				ensure_out(rv = select_intr(fd_max, &reader,
-											(content_length > -1)
-												? &writer : NULL,
-											NULL, &timeout));
+				else if (!strcasecmp(req->headers[i], "Cookie"))
+					setenv("HTTP_COOKIE", req->headers[i+1], 1);
 
-				/* timeout */
-				if (rv == 0)
-				{
-					ensure_out(kill(child, 0));
-				}
+				else if (!strcasecmp(req->headers[i], "Host"))
+					setenv("HTTP_HOST", req->headers[i+1], 1);
 
-				/* wait until we can read or write or both */
-				else if (rv > 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 ... */
-							ensure_out(buflen = uh_tcp_recv(cl, buf,
-								min(content_length, sizeof(buf))));
+				else if (!strcasecmp(req->headers[i], "Referer"))
+					setenv("HTTP_REFERER", req->headers[i+1], 1);
 
-							if (buflen > 0)
-							{
-								/* ... and write it to child's stdin */
-								if (write(wfd[1], buf, buflen) < 0)
-									perror("write()");
+				else if (!strcasecmp(req->headers[i], "User-Agent"))
+					setenv("HTTP_USER_AGENT", req->headers[i+1], 1);
 
-								content_length -= buflen;
-							}
+				else if (!strcasecmp(req->headers[i], "Content-Type"))
+					setenv("CONTENT_TYPE", req->headers[i+1], 1);
 
-							/* unexpected eof! */
-							else
-							{
-								if (write(wfd[1], "", 0) < 0)
-									perror("write()");
+				else if (!strcasecmp(req->headers[i], "Content-Length"))
+					setenv("CONTENT_LENGTH", req->headers[i+1], 1);
+			}
 
-								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;
-						}
-					}
+			/* execute child code ... */
+			if (chdir(pi->root))
+				perror("chdir()");
 
-					/* 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_out(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_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 > 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));
-
-									/* push out remaining head buffer */
-									if (hdroff < hdrlen)
-										ensure_out(uh_http_send(cl, req, &hdr[hdroff], hdrlen - hdroff));
-								}
-
-								/* ... failed and head buffer exceeded */
-								else if (hdrlen >= sizeof(hdr))
-								{
-									ensure_out(uh_cgi_error_500(cl, req,
-										"The CGI program generated an invalid response:\n\n"));
-
-									ensure_out(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_out(uh_http_send(cl, req, &buf[bufoff], buflen - bufoff));
-
-								header_sent = 1;
-								continue;
-							}
+			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));
+		}
 
-							/* headers complete, pass through buffer to socket */
-							ensure_out(uh_http_send(cl, req, buf, buflen));
-						}
+		/* 403 */
+		else
+		{
+			printf("Status: 403 Forbidden\r\n\r\n"
+				   "Access to this resource is forbidden\n");
+		}
 
-						/* 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_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));
-							}
+		close(wfd[0]);
+		close(rfd[1]);
+		exit(0);
 
-							/* send final chunk if we're in chunked transfer mode */
-							ensure_out(uh_http_send(cl, req, "", 0));
-							break;
-						}
-					}
-				}
+		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"));
-					}
+	/* parent; handle I/O relaying */
+	default:
+		memset(state, 0, sizeof(*state));
+
+		state->cl = cl;
+		state->cl->proc.pid = child;
+
+		/* close unneeded pipe ends */
+		close(rfd[1]);
+		close(wfd[0]);
 
-					/* send final chunk if we're in chunked transfer mode */
-					ensure_out(uh_http_send(cl, req, "", 0));
+		D("CGI: Child(%d) created: rfd(%d) wfd(%d)\n", child, rfd[0], wfd[1]);
 
+		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;
 				}
 			}
+		}
 
-		out:
-			close(rfd[0]);
-			close(wfd[1]);
+		state->rfd = rfd[0];
+		fd_nonblock(state->rfd);
 
-			if (!kill(child, 0))
-			{
-				kill(child, SIGTERM);
-				waitpid(child, NULL, 0);
-			}
+		state->wfd = wfd[1];
+		fd_nonblock(state->wfd);
 
-			break;
+		cl->cb = uh_cgi_socket_cb;
+		cl->priv = state;
+
+		break;
 	}
+
+	return true;
 }