Re: ?: keys.gnupg.net: Host not found

[Yuri Kanivetsky]

Hi,

I was able to track it down to this line of code:
http://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=blob;f=common/http.c;h=c2cac169d222ad5f41d1a8e224dd4bbaa2d7912b;hb=311816f6cf9d411dba060603e3c5d01c72824645#l2264
Here getaddrinfo() returns -3 (EAI_AGAIN) in the VM, but not on the host
machine. One can get there like so:

    $ cat ~/dirmngr-input-alias
    KEYSERVER --clear hkp://keys.gnupg.net
    KS_GET 409B6B1796C275462A1703113804BB82D39DC0E3
    BYE
    $ gdb dirmngr/dirmngr
    (gdb) break connect_server
    (gdb) r < ~/dirmngr-input-alias
    (gdb) u 2264
    (gdb) n
    (gdb) print $eax
    $1 = -3

Here's a test program that doesn't work in VM, but works on the host
machine:

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

    int main(void) {
        int r;
        struct addrinfo hints, *res;
        memset(&hints, 0, sizeof (hints));
        hints.ai_socktype = SOCK_STREAM;
        r = getaddrinfo("keys.gnupg.net", "11371", &hints, &res);
        // r = getaddrinfo("pool.sks-keyservers.net", "11371", &hints,
&res);
        if (r) {
            printf("r: %hhi\n", r);   // EAI_AGAIN
            printf("r: %s\n", gai_strerror(r));
        }
        return 0;
    }

    $ gcc 1.c
    $ ./a.out
    r: -3
    r: Temporary failure in name resolution

VM:

    $ `ldd a.out | grep libc | awk '{ print $3 }'`
    GNU C Library (Ubuntu GLIBC 2.21-0ubuntu4) stable release version 2.21,
by Roland McGrath et al.
    Copyright (C) 2015 Free Software Foundation, Inc.
    This is free software; see the source for copying conditions.
    There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
    PARTICULAR PURPOSE.
    Compiled by GNU CC version 4.9.2.
    Available extensions:
            crypt add-on version 2.1 by Michael Glad and others
            GNU Libidn by Simon Josefsson
            Native POSIX Threads Library by Ulrich Drepper et al
            BIND-8.2.3-T5B
    libc ABIs: UNIQUE IFUNC
    For bug reporting instructions, please see:
    <https://bugs.launchpad.net/ubuntu/+source/glibc/+bugs>.

host machine:

    $ `ldd a.out | grep libc | awk '{ print $3 }'`
    GNU C Library (GNU libc) stable release version 2.22, by Roland McGrath
et al.
    Copyright (C) 2015 Free Software Foundation, Inc.
    This is free software; see the source for copying conditions.
    There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
    PARTICULAR PURPOSE.
    Compiled by GNU CC version 5.2.0.
    Available extensions:
            crypt add-on version 2.1 by Michael Glad and others
            GNU Libidn by Simon Josefsson
            Native POSIX Threads Library by Ulrich Drepper et al
            BIND-8.2.3-T5B
    libc ABIs: UNIQUE IFUNC
    For bug reporting instructions, please see:
    <https://bugs.archlinux.org/>.

Can you confirm if it works with libc-2.22/libc-2.21 for you?

Regards,
Yuri

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