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From: "nigeltao at golang dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug network/16469] New: getaddrinfo incorrectly accepts two trailing dots
Date: Mon, 20 Jan 2014 05:05:00 -0000
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: network
X-Bugzilla-Version: 2.15
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https://sourceware.org/bugzilla/show_bug.cgi?id=16469

            Bug ID: 16469
           Summary: getaddrinfo incorrectly accepts two trailing dots
           Product: glibc
           Version: 2.15
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
          Assignee: unassigned at sourceware dot org
          Reporter: nigeltao at golang dot org

getaddrinfo("www.google.com..", etc) with two trailing dots resolves, but I
expected an error, as "www.google.com.." is not a valid domain name.

"www.google.com." with one trailing dot works as expected, as one trailing dot
means a FQDN. "www.google.com..." with three trailing dots gives a "No address
associated with hostname" error, as expected.

Ubuntu 12.04 "Precise", so glibc 2.15.

--------
/* This example program adapted from
http://en.wikipedia.org/wiki/Getaddrinfo#Example */

/* Note the two trailing dots in the "www.google.com.." hostname! */

#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>

#ifndef   NI_MAXHOST
#define   NI_MAXHOST 1025
#endif

int main(void)
{
    struct addrinfo *result;
    struct addrinfo *res;
    int error;

    error = getaddrinfo("www.google.com..", NULL, NULL, &result);
    if (error != 0)
    {   
        if (error == EAI_SYSTEM)
        {
            perror("getaddrinfo");
        }
        else
        {
            fprintf(stderr, "error in getaddrinfo: %s\n", gai_strerror(error));
        }   
        exit(EXIT_FAILURE);
    }   

    for (res = result; res != NULL; res = res->ai_next)
    {   
        char hostname[NI_MAXHOST] = "";

        error = getnameinfo(res->ai_addr, res->ai_addrlen, hostname,
NI_MAXHOST, NULL, 0, 0); 
        if (error != 0)
        {
            fprintf(stderr, "error in getnameinfo: %s\n", gai_strerror(error));
            continue;
        }
        if (*hostname != '\0')
            printf("hostname: %s\n", hostname);
    }   

    freeaddrinfo(result);
    return 0;
}
--------

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