Hi,

I got a problem with a tcp server I coded in openbsd. I test this code
in redhat and freebsd and it is running fine by allowing telnet and
other tcp client establish connection to it. But when I running this
code in openbsd, it only allow tcp connection from within localhost.

here is the code:

int
tcp_listen(const char *host, const char *serv, socklen_t *addrlenp)
{
int listenfd, n;
const int on = 1;
struct addrinfo hints, *res, *ressave;

bzero(&hints, sizeof(struct addrinfo));
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;

if ( (n = getaddrinfo(host, serv, &hints, &res)) != 0)
err_quit("tcp_listen error for %s, %s: %s",
host, serv, gai_strerror(n));
ressave = res;

do {
listenfd = socket(res->ai_family, res->ai_socktype,
res->ai_protocol);
if (listenfd < 0)
continue; /* error, try next one */

Setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on,
sizeof(on));
//Setsockopt(listenfd, IPPROTO_TCP, TCP_NODELAY, &on,
sizeof(on));
if (bind(listenfd, res->ai_addr, res->ai_addrlen) == 0)
break; /* success */

Close(listenfd); /* bind error, close and try
next one */
} while ( (res = res->ai_next) != NULL);

if (res == NULL) /* errno from final socket() or bind() */
err_sys("tcp_listen error for %s, %s", host, serv);

Listen(listenfd, LISTENQ);

if (addrlenp)


}


Thanks
sam

sam wrote:

> Hi,
>
> I got a problem with a tcp server I coded in openbsd. I test this code
> in redhat and freebsd and it is running fine by allowing telnet and
> other tcp client establish connection to it. But when I running this
> code in openbsd, it only allow tcp connection from within localhost.
>
> here is the code:
>
> int
> tcp_listen(const char *host, const char *serv, socklen_t *addrlenp)
> {
> int listenfd, n;
> const int on = 1;
> struct addrinfo hints, *res, *ressave;
>
> bzero(&hints, sizeof(struct addrinfo));
> hints.ai_flags = AI_PASSIVE;
> hints.ai_family = AF_UNSPEC;
> hints.ai_socktype = SOCK_STREAM;
>
> if ( (n = getaddrinfo(host, serv, &hints, &res)) != 0)
> err_quit("tcp_listen error for %s, %s: %s",
> host, serv, gai_strerror(n));
> ressave = res;
>
> do {
> listenfd = socket(res->ai_family, res->ai_socktype,
> res->ai_protocol);
> if (listenfd < 0)
> continue; /* error, try next one */
>
> Setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &on,
> sizeof(on));
> //Setsockopt(listenfd, IPPROTO_TCP, TCP_NODELAY, &on,
> sizeof(on));
> if (bind(listenfd, res->ai_addr, res->ai_addrlen) == 0)
> break; /* success */
>
> Close(listenfd); /* bind error, close and try
> next one */
> } while ( (res = res->ai_next) != NULL);
>
> if (res == NULL) /* errno from final socket() or bind() */
> err_sys("tcp_listen error for %s, %s", host, serv);
>
> Listen(listenfd, LISTENQ);
>
> if (addrlenp)
>
>
> }
>
>
> Thanks
> sam

And the following netstat command shown that this tcp code is listening
to Tcp6, not in Tcp:

Proto Recv-Q Send-Q Local Address Foreign Address (state)
tcp6 0 0 *.1111 *.* LISTEN

I don't find the port 1111 appear in tcp connection. why is that happened??

Sam