remote port forward failed because of failure resolving localhost to IP with error No such file or directory

[Vincent Lin]

Hi all,

I'm using openssh 5.9p1 with the remote port forwarding "ssh -R
20000:localhost:22 xxx at x.x.x.x". The tunnel is set up. But when I write
data to the tunnel, the ssh client failed to forward the data to the
localhost. The debug is below:

debug1: client_input_channel_open: ctype forwarded-tcpip rchan 2 win
131072 max 32768
debug1: client_request_forwarded_tcpip: listen localhost port 20000,
originator 127.0.0.1 port 36478
connect_to localhost: unknown host (No such file or directory)
debug1: failure forwarded-tcpip


The code relevant is here:

3133 /* Return CONNECTING channel to remote host, port */
3134 static Channel *
3135 connect_to(const char *host, u_short port, char *ctype, char *rname)
3136 {
3137     struct addrinfo hints;
3138     int gaierr;
3139     int sock = -1;
3140     char strport[NI_MAXSERV];
3141     struct channel_connect cctx;
3142     Channel *c;
3143
3144     memset(&cctx, 0, sizeof(cctx));
3145     memset(&hints, 0, sizeof(hints));
3146     hints.ai_family = IPv4or6;
3147     hints.ai_socktype = SOCK_STREAM;
3148     snprintf(strport, sizeof strport, "%d", port);
3149     if ((gaierr = getaddrinfo(host, strport, &hints, &cctx.aitop)) != 0) {
3150         error("connect_to %.100s: unknown host (%s)", host,
3151             ssh_gai_strerror(gaierr));
3152         return NULL;
3153     }


The error is returned by the function getaddrinfo. And it's "No such
file or directory". That is saying it can't find some file to resolve
localhost to IP. I found the error is only occurred on the x86_64 with
glibc 2.9.

Does anybody has the similar problem before? Thanks in advance.


Thanks,

Vincent