163 lines
4.0 KiB
C
163 lines
4.0 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* $Id: resolve.c,v 1.13 2008-10-28 20:03:22 danf Exp $
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***************************************************************************/
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/* Purpose
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*
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* Resolve the given name, using system name resolve functions (NOT any
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* function provided by libcurl). Used to see if the name exists and thus if
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* we can allow a test case to use it for testing.
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*
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* Like if 'localhost' actual exists etc.
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*
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*/
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#include "setup.h" /* portability help from the lib directory */
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#ifdef HAVE_SIGNAL_H
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#include <signal.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef _XOPEN_SOURCE_EXTENDED
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/* This define is "almost" required to build on HPUX 11 */
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#include <arpa/inet.h>
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#endif
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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#define ENABLE_CURLX_PRINTF
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/* make the curlx header define all printf() functions to use the curlx_*
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versions instead */
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#include "curlx.h" /* from the private lib dir */
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#include "util.h"
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/* include memdebug.h last */
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#include "memdebug.h"
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static bool use_ipv6 = FALSE;
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static const char *ipv_inuse = "IPv4";
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const char *serverlogfile=""; /* for a util.c function we don't use */
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int main(int argc, char *argv[])
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{
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int arg=1;
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const char *host = NULL;
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int rc = 0;
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while(argc>arg) {
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if(!strcmp("--version", argv[arg])) {
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printf("resolve IPv4%s\n",
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#ifdef ENABLE_IPV6
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"/IPv6"
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#else
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""
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#endif
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);
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return 0;
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}
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else if(!strcmp("--ipv6", argv[arg])) {
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ipv_inuse = "IPv6";
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use_ipv6 = TRUE;
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arg++;
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}
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else if(!strcmp("--ipv4", argv[arg])) {
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/* for completeness, we support this option as well */
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ipv_inuse = "IPv4";
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use_ipv6 = FALSE;
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arg++;
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}
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else {
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host = argv[arg++];
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}
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}
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if(!host) {
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puts("Usage: resolve [option] <host>\n"
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" --version\n"
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" --ipv4"
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#ifdef ENABLE_IPV6
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"\n --ipv6"
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#endif
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);
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return 1;
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}
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#ifdef WIN32
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win32_init();
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atexit(win32_cleanup);
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#endif
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if(!use_ipv6) {
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/* gethostbyname() resolve */
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struct hostent *he;
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he = gethostbyname(host);
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rc = !he;
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}
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else {
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#ifdef ENABLE_IPV6
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/* Check that the system has IPv6 enabled before checking the resolver */
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int s = socket(PF_INET6, SOCK_DGRAM, 0);
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if(s == -1)
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/* an ipv6 address was requested and we can't get/use one */
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rc = -1;
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else {
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sclose(s);
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}
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if (rc == 0) {
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/* getaddrinfo() resolve */
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struct addrinfo *ai;
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struct addrinfo hints;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = PF_INET6;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags = AI_CANONNAME;
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/* Use parenthesis around function to stop it from being replaced by
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the macro in memdebug.h */
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rc = (getaddrinfo)(host, "80", &hints, &ai);
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}
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#else
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puts("IPv6 support has been disabled in this program");
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return 1;
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#endif
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}
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if(rc)
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printf("Resolving %s '%s' didn't work\n", ipv_inuse, host);
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return !!rc;
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}
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