getsockname()

[David Schwartz]

> (this is of course not my program, just some code that does the same)
>
> --- snipp ---
> #include <stdio.h>
> #include <sys/types.h>
> #include <sys/socket.h>
> #include <string.h>
> #include <stdlib.h>
> #include <netinet/in.h>
> #include <arpa/inet.h>
>
> int main()
> {
>      int sock, len;

	Okay, you haven't set the value of 'len'.

>      struct sockaddr_in addr, foo;
>
>      if((sock=socket(AF_INET, SOCK_STREAM, 0))<0)
>      {
>          exit(0);
>      }
>
>      memset(&addr, 0, sizeof(struct sockaddr_in));
>      addr.sin_family = AF_INET;
>      addr.sin_addr.s_addr = INADDR_ANY;
>      addr.sin_port = htons(0);
>
>      if(bind(sock, (struct sockaddr *) &addr, sizeof(struct
> sockaddr_in))<0)
>      {
>          perror("bind");
>          exit(0);
>      }
>
>      if(listen(sock, 5)<0)
>      {
>          perror("listen");
>          exit(0);
>      }
>
>      getsockname(sock, (struct sockaddr *) &foo, &len);

	Hmm, you still haven't set the value of 'len'. And you ignore the return
value of 'getsockname'.

>      fprintf(stderr, "listening on %s:%d\n", inet_ntoa(foo.sin_addr),
> ntohs(foo.sin_port));
>
>      return 0;
> }

> $ ./a.out
> listening on 86.186.4.40:49087
> $ ./a.out
> listening on 0.0.0.0:3810

	Fix those two bugs and see if you still have a problem.

	DS