mirror of
https://git.savannah.gnu.org/git/inetutils.git
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122 lines
3.1 KiB
C
122 lines
3.1 KiB
C
/* runtime-ipv6 - Check that system is able to set IPv6 address.
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Copyright (C) 2020-2022 Free Software Foundation, Inc.
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This file is part of GNU Inetutils.
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GNU Inetutils is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
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your option) any later version.
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GNU Inetutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see `http://www.gnu.org/licenses/'. */
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/* Written by Mats Erik Andersson. */
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/* Runtime-ipv6 determines by default whether IPv6 address ::1 can
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* be selected. The switch `-6' is identical, whereas `-4' probes
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* for 127.0.0.1.
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*
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* Invocation:
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*
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* runtime-ipv6 [-4] [-6]
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*
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* Return value is 0 (zero) when successful, otherwise -1.
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* On failure a message is printed to stderr: `IPv# disabled in system'.
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*
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* By defining the shell environment variable VERBOSE, a short affirmative
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* message is printed also in case of successful testing.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#define RESOLVE_OK 0
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#define RESOLVE_FAIL -1
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/* The default action is to investigate localhost as IPv6. */
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int tested_family = AF_INET6;
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char *tested_family_name = "IPv6";
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char *tested_localhost = "::1";
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int
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main (int argc, char *argv[])
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{
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int err, ch;
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struct addrinfo hints, *aiptr;
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while ((ch = getopt (argc, argv, "46")) != -1)
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{
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switch (ch)
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{
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case '4':
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tested_family = AF_INET;
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tested_family_name = "IPv4";
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tested_localhost = "127.0.0.1";
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break;
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case '6':
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tested_family = AF_INET6;
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tested_family_name = "IPv6";
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tested_localhost = "::1";
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break;
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default:
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fprintf (stderr, "Usage: %s [-4 | -6]\n"
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"Determines presence of selected INET address family.\n",
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argv[0]);
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return EXIT_FAILURE;
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}
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}
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memset (&hints, 0, sizeof (hints));
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hints.ai_family = tested_family;
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hints.ai_socktype = SOCK_DGRAM;
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hints.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV;
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#ifdef AI_ADDRCONFIG
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hints.ai_flags |= AI_ADDRCONFIG;
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#endif
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err = getaddrinfo (tested_localhost, "1237", &hints, &aiptr);
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if (!err)
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{
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/* Should not really happen. */
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if (aiptr == NULL)
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#ifdef EAI_NODATA
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err = EAI_NODATA;
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#else
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err = EAI_FAIL;
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#endif
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freeaddrinfo (aiptr);
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}
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if (err)
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{
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/* Not able to select localhost as IPv6. */
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fprintf (stderr, "%s is disabled in this running system: \"%s\" %s\n",
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tested_family_name, tested_localhost, gai_strerror (err));
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return RESOLVE_FAIL;
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}
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else if (getenv ("VERBOSE"))
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printf ("Detection of %s address %s was successful.\n",
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tested_family_name, tested_localhost);
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return RESOLVE_OK;
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}
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