resolve.c revision 9bd90e6e25f1e55f50201c87a1b5837de7e5b64a
1/*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at http://curl.haxx.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 ***************************************************************************/ 22 23/* Purpose 24 * 25 * Resolve the given name, using system name resolve functions (NOT any 26 * function provided by libcurl). Used to see if the name exists and thus if 27 * we can allow a test case to use it for testing. 28 * 29 * Like if 'localhost' actual exists etc. 30 * 31 */ 32 33#define CURL_NO_OLDIES 34 35#include "setup.h" /* portability help from the lib directory */ 36 37#ifdef HAVE_SIGNAL_H 38#include <signal.h> 39#endif 40#ifdef HAVE_UNISTD_H 41#include <unistd.h> 42#endif 43#ifdef HAVE_SYS_TYPES_H 44#include <sys/types.h> 45#endif 46#ifdef HAVE_SYS_SOCKET_H 47#include <sys/socket.h> 48#endif 49#ifdef HAVE_NETINET_IN_H 50#include <netinet/in.h> 51#endif 52#ifdef _XOPEN_SOURCE_EXTENDED 53/* This define is "almost" required to build on HPUX 11 */ 54#include <arpa/inet.h> 55#endif 56#ifdef HAVE_NETDB_H 57#include <netdb.h> 58#endif 59 60#define ENABLE_CURLX_PRINTF 61/* make the curlx header define all printf() functions to use the curlx_* 62 versions instead */ 63#include "curlx.h" /* from the private lib dir */ 64#include "util.h" 65 66/* include memdebug.h last */ 67#include "memdebug.h" 68 69static bool use_ipv6 = FALSE; 70static const char *ipv_inuse = "IPv4"; 71 72const char *serverlogfile=""; /* for a util.c function we don't use */ 73 74int main(int argc, char *argv[]) 75{ 76 int arg=1; 77 const char *host = NULL; 78 int rc = 0; 79 80 while(argc>arg) { 81 if(!strcmp("--version", argv[arg])) { 82 printf("resolve IPv4%s\n", 83#ifdef ENABLE_IPV6 84 "/IPv6" 85#else 86 "" 87#endif 88 ); 89 return 0; 90 } 91 else if(!strcmp("--ipv6", argv[arg])) { 92 ipv_inuse = "IPv6"; 93 use_ipv6 = TRUE; 94 arg++; 95 } 96 else if(!strcmp("--ipv4", argv[arg])) { 97 /* for completeness, we support this option as well */ 98 ipv_inuse = "IPv4"; 99 use_ipv6 = FALSE; 100 arg++; 101 } 102 else { 103 host = argv[arg++]; 104 } 105 } 106 if(!host) { 107 puts("Usage: resolve [option] <host>\n" 108 " --version\n" 109 " --ipv4" 110#ifdef ENABLE_IPV6 111 "\n --ipv6" 112#endif 113 ); 114 return 1; 115 } 116 117#ifdef WIN32 118 win32_init(); 119 atexit(win32_cleanup); 120#endif 121 122 if(!use_ipv6) { 123 /* gethostbyname() resolve */ 124 struct hostent *he; 125 126 he = gethostbyname(host); 127 128 rc = !he; 129 } 130 else { 131#ifdef ENABLE_IPV6 132 /* Check that the system has IPv6 enabled before checking the resolver */ 133 curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0); 134 if(s == CURL_SOCKET_BAD) 135 /* an ipv6 address was requested and we can't get/use one */ 136 rc = -1; 137 else { 138 sclose(s); 139 } 140 141 if (rc == 0) { 142 /* getaddrinfo() resolve */ 143 struct addrinfo *ai; 144 struct addrinfo hints; 145 146 memset(&hints, 0, sizeof(hints)); 147 hints.ai_family = PF_INET6; 148 hints.ai_socktype = SOCK_STREAM; 149 hints.ai_flags = AI_CANONNAME; 150 /* Use parenthesis around function to stop it from being replaced by 151 the macro in memdebug.h */ 152 rc = (getaddrinfo)(host, "80", &hints, &ai); 153 } 154 155#else 156 puts("IPv6 support has been disabled in this program"); 157 return 1; 158#endif 159 } 160 if(rc) 161 printf("Resolving %s '%s' didn't work\n", ipv_inuse, host); 162 163 return !!rc; 164} 165