From 5792d42f0ff130380d036ff427d8408ecd61b6f2 Mon Sep 17 00:00:00 2001
From: Niels Provos <provos@gmail.com>
Date: Sun, 16 Nov 2008 23:22:14 +0000
Subject: [PATCH] Allow setting of local port for evhttp connections to support
 millions of connections from a single system; from Richard Jones

svn:r948
---
 ChangeLog             |  1 +
 http-internal.h       |  1 +
 http.c                | 10 +++++++++-
 include/event2/http.h |  4 ++++
 4 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index cbf18157..e7e4634e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -127,6 +127,7 @@ Changes in current version:
  o Do not remove Accept-Encoding header
  o Clear the timer cache on entering the event loop; reported by Victor Chang
  o Only bind the socket on connect when a local address has been provided; reported by Alejo Sanchez
+ o Allow setting of local port for evhttp connections to support millions of connections from a single system; from Richard Jones.
 	
 Changes in 1.4.0:
  o allow \r or \n individually to separate HTTP headers instead of the standard "\r\n"; from Charles Kerr.
diff --git a/http-internal.h b/http-internal.h
index b1225a87..a02a57e7 100644
--- a/http-internal.h
+++ b/http-internal.h
@@ -65,6 +65,7 @@ struct evhttp_connection {
 	struct event close_ev;
 	
 	char *bind_address;		/* address to use for binding the src */
+	u_short bind_port;		/* local port for binding the src */
 
 	char *address;			/* address to connect to */
 	u_short port;
diff --git a/http.c b/http.c
index 6f1e0b0e..bfd3456a 100644
--- a/http.c
+++ b/http.c
@@ -982,6 +982,13 @@ evhttp_connection_set_local_address(struct evhttp_connection *evcon,
 		event_err(1, "%s: strdup", __func__);
 }
 
+void
+evhttp_connection_set_local_port(struct evhttp_connection *evcon,
+    ev_uint16_t port)
+{
+	assert(evcon->state == EVCON_DISCONNECTED);
+	evcon->bind_port = port;
+}
 
 static void
 evhttp_request_dispatch(struct evhttp_connection* evcon)
@@ -1761,7 +1768,8 @@ evhttp_connection_connect(struct evhttp_connection *evcon)
 	assert(!(evcon->flags & EVHTTP_CON_INCOMING));
 	evcon->flags |= EVHTTP_CON_OUTGOING;
 	
-	evcon->fd = bind_socket(evcon->bind_address, 0 /*port*/, 0 /*reuse*/);
+	evcon->fd = bind_socket(
+		evcon->bind_address, evcon->bind_port, 0 /*reuse*/);
 	if (evcon->fd == -1) {
 		event_debug(("%s: failed to bind to \"%s\"",
 			__func__, evcon->bind_address));
diff --git a/include/event2/http.h b/include/event2/http.h
index a10d0c1e..97949f30 100644
--- a/include/event2/http.h
+++ b/include/event2/http.h
@@ -312,6 +312,10 @@ void evhttp_connection_free(struct evhttp_connection *evcon);
 void evhttp_connection_set_local_address(struct evhttp_connection *evcon,
     const char *address);
 
+/** sets the local port from which http connections are made */
+void evhttp_connection_set_local_port(struct evhttp_connection *evcon,
+    ev_uint16_t port);
+
 /** Sets the timeout for events related to this connection */
 void evhttp_connection_set_timeout(struct evhttp_connection *evcon,
     int timeout_in_secs);
-- 
2.40.0