forwarded from Debian bug 192876

From: Martin Pool <mbp@sourcefrog.net>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: libc6: getaddrinfo() does not detect invalid numeric services
Date: Sun, 11 May 2003 13:00:17 +1000

Package: libc6
Version: 2.3.1-16
Severity: normal

By my reading of the getaddrinfo() manual (and also the Solaris
manpage) getaddrinfo() ought to return EAI_SERVICE when the requested
service is not available.  However, it does not seem to do this when
the service is a number, but out of the valid range 1-65535 for TCP
ports.

Here is a reproduction case:

------------------
#include <string.h>
#include <stdio.h>
#include <stdlib.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>

/* try getaddrinfo */
int main(void)
{
	int err;
	struct addrinfo *res;
	struct addrinfo hints;

	bzero(&hints, sizeof hints);
 	hints.ai_family = AF_INET; 
	hints.ai_socktype = SOCK_STREAM;
	hints.ai_flags = AI_PASSIVE;

	err = getaddrinfo(NULL, "80000", &hints, &res);
	printf("err=%d, %s\n", err, gai_strerror(err));

	return 0;
}
------------------

On my machine this returns 0, rather than the expected -8 "servname
not supported".

If I change "80000" to an invalid non-numeric string then the error
is flagged as expected.