implement proper flow control for relaying postdata

diff --git a/client.c b/client.c
index 2fdc1b2..43c4af8 100644 (file)
--- a/client.c
+++ b/client.c
@@ -249,29 +249,37 @@ static void client_parse_header(struct client *cl, char *data)
        cl->state = CLIENT_STATE_HEADER;
 }
 
-static bool client_data_cb(struct client *cl, char *buf, int len)
+void client_poll_post_data(struct client *cl)
 {
        struct dispatch *d = &cl->dispatch;
        struct http_request *r = &cl->request;
-       int consumed = 0;
-       int cur_len = 0;
+       char *buf;
+       int len;
 
-       if (!d->data_send)
-               return false;
+       if (cl->state == CLIENT_STATE_DONE)
+               return;
 
-       while (len) {
-               int offset = 0;
+       while (1) {
                char *sep;
+               int offset = 0;
+               int cur_len;
 
-               consumed += cur_len;
-               buf += cur_len;
-               len -= cur_len;
-               cur_len = min(r->content_length, len);
+               buf = ustream_get_read_buf(cl->us, &len);
+               if (!buf || !len)
+                       break;
+
+               if (!d->data_send)
+                       return;
 
+               cur_len = min(r->content_length, len);
                if (cur_len) {
-                       r->content_length -= cur_len;
+                       if (d->data_blocked)
+                               break;
+
                        if (d->data_send)
                                d->data_send(cl, buf, cur_len);
+                       r->content_length -= cur_len;
+                       ustream_consume(cl->us, cur_len);
                        continue;
                }
 
@@ -286,35 +294,38 @@ static bool client_data_cb(struct client *cl, char *buf, int len)
                        break;
 
                *sep = 0;
-               cur_len = sep + 2 - buf;
 
                r->content_length = strtoul(buf + offset, &sep, 16);
                r->transfer_chunked++;
+               ustream_consume(cl->us, sep + 2 - buf);
 
                /* invalid chunk length */
-               if (sep && *sep)
-                       goto abort;
+               if (sep && *sep) {
+                       r->content_length = 0;
+                       r->transfer_chunked = 0;
+                       break;
+               }
 
                /* empty chunk == eof */
-               if (!r->content_length)
+               if (!r->content_length) {
                        r->transfer_chunked = false;
-
-               continue;
-
-abort:
-               consumed = len;
-               r->content_length = 0;
-               r->transfer_chunked = 0;
-               break;
+                       break;
+               }
        }
 
-       ustream_consume(cl->us, consumed);
-       if (!r->content_length && !r->transfer_chunked) {
+       buf = ustream_get_read_buf(cl->us, &len);
+       if (!r->content_length && !r->transfer_chunked &&
+               cl->state != CLIENT_STATE_DONE) {
                if (cl->dispatch.data_done)
                        cl->dispatch.data_done(cl);
 
                cl->state = CLIENT_STATE_DONE;
        }
+}
+
+static bool client_data_cb(struct client *cl, char *buf, int len)
+{
+       client_poll_post_data(cl);
        return false;
 }
 

diff --git a/proc.c b/proc.c
index 425576e..3ebfffd 100644 (file)
--- a/proc.c
+++ b/proc.c
@@ -235,6 +235,18 @@ static void proc_relay_write_cb(struct ustream *us, int bytes)
        if (ustream_pending_data(us, true))
                return;
 
+       cl->dispatch.data_blocked = false;
+       us->notify_write = NULL;
+       client_poll_post_data(cl);
+}
+
+static void proc_relay_write_close_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);
 }
 
@@ -243,6 +255,10 @@ 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);
+       if (ustream_pending_data(us, true)) {
+               cl->dispatch.data_blocked = true;
+               us->notify_write = proc_relay_write_cb;
+       }
 }
 
 static void proc_data_done(struct client *cl)
@@ -250,7 +266,7 @@ 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;
+               us->notify_write = proc_relay_write_close_cb;
                return;
        }
 

diff --git a/uhttpd.h b/uhttpd.h
index 5ec0f00..3cd040d 100644 (file)
--- a/uhttpd.h
+++ b/uhttpd.h
@@ -144,6 +144,8 @@ struct dispatch {
        void (*write_cb)(struct client *cl);
        void (*close_fds)(struct client *cl);
        void (*free)(struct client *cl);
+       bool data_blocked;
+
        union {
                struct {
                        struct blob_attr **hdr;
@@ -208,6 +210,7 @@ void __printf(4, 5)
 uh_client_error(struct client *cl, int code, const char *summary, const char *fmt, ...);
 
 void uh_handle_request(struct client *cl);
+void client_poll_post_data(struct client *cl);
 
 void uh_auth_add(const char *path, const char *user, const char *pass);
 bool uh_auth_check(struct client *cl, struct path_info *pi);