From 2bef561c890f275ce3b785e6abdb3eda28c96aa8 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Thu, 3 Jan 2013 02:25:10 +0100
Subject: [PATCH] add post data relaying

---
 client.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++----
 proc.c   | 36 +++++++++++++++++++++++++++++
 uhttpd.h |  6 ++++-
 3 files changed, 106 insertions(+), 6 deletions(-)

diff --git a/client.c b/client.c
index 4d8b17b..b673153 100644
--- a/client.c
+++ b/client.c
@@ -204,6 +204,8 @@ static void client_header_complete(struct client *cl)
 
 static void client_parse_header(struct client *cl, char *data)
 {
+	struct http_request *r = &cl->request;
+	char *err;
 	char *name;
 	char *val;
 
@@ -224,13 +226,22 @@ static void client_parse_header(struct client *cl, char *data)
 		if (isupper(*name))
 			*name = tolower(*name);
 
-	if (!strcasecmp(data, "Expect")) {
+	if (!strcmp(data, "expect")) {
 		if (!strcasecmp(val, "100-continue"))
-			cl->request.expect_cont = true;
+			r->expect_cont = true;
 		else {
 			uh_header_error(cl, 412, "Precondition Failed");
 			return;
 		}
+	} else if (!strcmp(data, "content-length")) {
+		r->content_length = strtoul(val, &err, 0);
+		if (err && *err) {
+			uh_header_error(cl, 400, "Bad Request");
+			return;
+		}
+	} else if (!strcmp(data, "transfer-encoding")) {
+		if (!strcmp(val, "chunked"))
+			r->transfer_chunked = true;
 	}
 
 
@@ -241,7 +252,54 @@ static void client_parse_header(struct client *cl, char *data)
 
 static bool client_data_cb(struct client *cl, char *buf, int len)
 {
-	return false;
+	struct dispatch *d = &cl->dispatch;
+	struct http_request *r = &cl->request;
+	int consumed = 0;
+	int cur_len = 0;
+
+	if (!d->data_send)
+		return false;
+
+	while (len) {
+		char *sep;
+
+		r->content_length -= cur_len;
+		consumed += cur_len;
+		buf += cur_len;
+		len -= cur_len;
+		cur_len = min(r->content_length, len);
+
+		if (cur_len) {
+			if (d->data_send)
+				d->data_send(cl, buf, cur_len);
+			continue;
+		}
+
+		if (!r->transfer_chunked)
+			break;
+
+		sep = strstr(buf, "\r\n");
+		if (!sep)
+			break;
+
+		*sep = 0;
+		cur_len = sep + 2 - buf;
+
+		r->content_length = strtoul(buf, &sep, 16);
+
+		/* invalid chunk length */
+		if (sep && *sep)
+			return false;
+
+		/* empty chunk == eof */
+		if (!r->content_length) {
+			r->transfer_chunked = false;
+			continue;
+		}
+	}
+
+	ustream_consume(cl->us, consumed);
+	return r->content_length || r->transfer_chunked;
 }
 
 static bool client_header_cb(struct client *cl, char *buf, int len)
@@ -258,7 +316,7 @@ static bool client_header_cb(struct client *cl, char *buf, int len)
 	line_len = newline + 2 - buf;
 	ustream_consume(cl->us, line_len);
 	if (cl->state == CLIENT_STATE_DATA)
-		client_data_cb(cl, newline + 2, len - line_len);
+		return client_data_cb(cl, newline + 2, len - line_len);
 
 	return true;
 }
@@ -278,7 +336,7 @@ static void client_read_cb(struct client *cl)
 
 	do {
 		str = ustream_get_read_buf(us, &len);
-		if (!str)
+		if (!str || !len)
 			break;
 
 		if (cl->state >= array_size(read_cbs) || !read_cbs[cl->state])
@@ -287,6 +345,8 @@ static void client_read_cb(struct client *cl)
 		if (!read_cbs[cl->state](cl, str, len)) {
 			if (len == us->r.buffer_len)
 				uh_header_error(cl, 413, "Request Entity Too Large");
+			if (cl->dispatch.data_done)
+				cl->dispatch.data_done(cl);
 			break;
 		}
 	} while(1);
diff --git a/proc.c b/proc.c
index b54e71e..351b473 100644
--- a/proc.c
+++ b/proc.c
@@ -221,6 +221,40 @@ static void proc_free(struct client *cl)
 	uh_relay_free(&cl->dispatch.proc.r);
 }
 
+static void proc_write_close(struct client *cl)
+{
+	shutdown(cl->dispatch.proc.r.sfd.fd.fd, SHUT_WR);
+}
+
+static void proc_relay_write_cb(struct ustream *us, int bytes)
+{
+	struct client *cl = container_of(us, struct client, dispatch.proc.r.sfd.stream);
+
+	if (ustream_pending_data(us, true))
+		return;
+
+	proc_write_close(cl);
+}
+
+static void proc_data_send(struct client *cl, const char *data, int len)
+{
+	struct ustream *us = &cl->dispatch.proc.r.sfd.stream;
+
+	ustream_write(us, data, len, false);
+}
+
+static void proc_data_done(struct client *cl)
+{
+	struct ustream *us = &cl->dispatch.proc.r.sfd.stream;
+
+	if (ustream_pending_data(us, true)) {
+		us->notify_write = proc_relay_write_cb;
+		return;
+	}
+
+	proc_write_close(cl);
+}
+
 bool uh_create_process(struct client *cl, struct path_info *pi,
 		       void (*cb)(struct client *cl, struct path_info *pi, int fd))
 {
@@ -253,6 +287,8 @@ bool uh_create_process(struct client *cl, struct path_info *pi,
 	uh_relay_open(cl, &cl->dispatch.proc.r, fds[0], pid);
 	d->free = proc_free;
 	d->close_fds = proc_close_fds;
+	d->data_send = proc_data_send;
+	d->data_done = proc_data_done;
 	d->proc.r.header_cb = proc_handle_header;
 	d->proc.r.header_end = proc_handle_header_end;
 	d->proc.r.close = proc_handle_close;
diff --git a/uhttpd.h b/uhttpd.h
index e92c469..c36d3bb 100644
--- a/uhttpd.h
+++ b/uhttpd.h
@@ -78,8 +78,10 @@ enum http_version {
 struct http_request {
 	enum http_method method;
 	enum http_version version;
-	bool expect_cont;
 	int redirect_status;
+	int content_length;
+	bool expect_cont;
+	bool transfer_chunked;
 	const char *url;
 	const struct auth_realm *realm;
 };
@@ -138,6 +140,8 @@ struct dispatch_handler {
 };
 
 struct dispatch {
+	void (*data_send)(struct client *cl, const char *data, int len);
+	void (*data_done)(struct client *cl);
 	void (*write_cb)(struct client *cl);
 	void (*close_fds)(struct client *cl);
 	void (*free)(struct client *cl);
-- 
2.30.2