Re: [Libevent-users] Bind outgoing IP with bufferevents

[Bas Verhoeven <libevent@xxxxxxxxxx>]

Nick Mathewson wrote:
> When are you calling it?  It should return the actual fd once
> bufferevent_socket_connect() has been called -- but of course that
> won't help you, since you need to bind the socket before connect is called.
>   

I was calling it after creating the socket with '_socket_new', hoping it 
would mimic the socket() behavior and would have created a fd already.

> I believe it should work if you do it like this:
>
>    fd = socket(...);
>    bind(fd, ...);
>    evutil_make_socket_nonblocking(fd);
>    bev = bufferevent_socket_new(client->base, fd, BEV_OPT_CLOSE_ON_FREE);
>    bufferevent_socket_connect(event, (struct sockaddr *)&sockaddr, 
>        sizeof(sockaddr));
>
>
> Does that turn out okay for you?
>   

That seems to work fine indeed.

Initially I forgot the 'evutil_make_socket_nonblocking(fd);'. Libevent 
clearly doesn't like this but instead of returning an error it simply 
crashes (segfault).

#1  0xb7ede21a in _bufferevent_run_eventcb (bufev=0x9bb9848, what=128) 
at bufferevent.c:206
No locals.
#2  0xb7edef8a in bufferevent_socket_connect (bev=0x9bb9848, 
sa=0xbfb27a40, socklen=16) at bufferevent_sock.c:382
       fd = 10
       r = <value optimized out>
       result = 0
       ownfd = 0
#3  0x08049372 in irc_client_connect_with_addr (client=0x9bb9760, 
addr=0x9bb99c0) at src/irc_client.c:294
       sockaddr = {sin_family = 2, sin_port = 2842, sin_addr = {s_addr 
= 509068891}, sin_zero = "\000\000\000\000\000\000\000"}
       sockaddr_bind = {sin_family = 2, sin_port = 0, sin_addr = 
{s_addr = 1951909467}, sin_zero = "\000\000\000\000\000\000\000"}
       event = (struct bufferevent *) 0x9bb9848
       fd = 10
..

Libevent seems to want to run the 'event callback', which I have not yet 
registered. Registering the callbacks prior to calling 
'bufferevent_socket_connect' stops it from crashing. Not sure if this is 
a bug?

My problems have been solved so far, it works fine when I add the 
evutil_make_socket_nonblocking(fd).

Thanks!


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