resolve.c (3348B)
1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 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 https://curl.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 * SPDX-License-Identifier: curl 22 * 23 ***************************************************************************/ 24 #include "first.h" 25 26 /* Purpose 27 * 28 * Resolve the given name, using system name resolve functions (NOT any 29 * function provided by libcurl). Used to see if the name exists and thus if 30 * we can allow a test case to use it for testing. 31 * 32 * Like if 'localhost' actual exists etc. 33 * 34 */ 35 36 static int test_resolve(int argc, char *argv[]) 37 { 38 int arg = 1; 39 const char *host = NULL; 40 int rc = 0; 41 42 while(argc > arg) { 43 if(!strcmp("--version", argv[arg])) { 44 printf("resolve IPv4%s\n", 45 #if defined(CURLRES_IPV6) 46 "/IPv6" 47 #else 48 "" 49 #endif 50 ); 51 return 0; 52 } 53 else if(!strcmp("--ipv6", argv[arg])) { 54 #if defined(CURLRES_IPV6) 55 ipv_inuse = "IPv6"; 56 use_ipv6 = TRUE; 57 arg++; 58 #else 59 puts("IPv6 support has been disabled in this program"); 60 return 1; 61 #endif 62 } 63 else if(!strcmp("--ipv4", argv[arg])) { 64 /* for completeness, we support this option as well */ 65 ipv_inuse = "IPv4"; 66 #if defined(CURLRES_IPV6) 67 use_ipv6 = FALSE; 68 #endif 69 arg++; 70 } 71 else { 72 host = argv[arg++]; 73 } 74 } 75 if(!host) { 76 puts("Usage: resolve [option] <host>\n" 77 " --version\n" 78 " --ipv4" 79 #if defined(CURLRES_IPV6) 80 "\n --ipv6" 81 #endif 82 ); 83 return 1; 84 } 85 86 #ifdef _WIN32 87 if(win32_init()) 88 return 2; 89 #endif 90 91 #if defined(CURLRES_IPV6) 92 if(use_ipv6) { 93 /* Check that the system has IPv6 enabled before checking the resolver */ 94 curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0); 95 if(s == CURL_SOCKET_BAD) 96 /* an IPv6 address was requested and we can't get/use one */ 97 rc = -1; 98 else { 99 sclose(s); 100 } 101 } 102 103 if(rc == 0) { 104 /* getaddrinfo() resolve */ 105 struct addrinfo *ai; 106 struct addrinfo hints; 107 108 memset(&hints, 0, sizeof(hints)); 109 hints.ai_family = use_ipv6 ? PF_INET6 : PF_INET; 110 hints.ai_socktype = SOCK_STREAM; 111 hints.ai_flags = 0; 112 rc = getaddrinfo(host, "80", &hints, &ai); 113 if(rc == 0) 114 freeaddrinfo(ai); 115 } 116 #else 117 { 118 struct hostent *he; /* gethostbyname() resolve */ 119 120 #ifdef __AMIGA__ 121 he = gethostbyname((unsigned char *)CURL_UNCONST(host)); 122 #else 123 he = gethostbyname(host); 124 #endif 125 126 rc = !he; 127 } 128 #endif 129 130 if(rc) 131 printf("Resolving %s '%s' didn't work\n", ipv_inuse, host); 132 133 return !!rc; 134 }