1 /* $KAME: getaddrinfo.c,v 1.15 2000/07/09 04:37:24 itojun Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Copyright (C) 2017 THL A29 Limited, a Tencent company. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the project nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <stdlib.h> 36 37 #include "netinet/in.h" 38 #include "arpa/inet.h" 39 #include "sys/socket.h" 40 #include "netdb.h" 41 42 /* Just conver numeric hostname to int and not do anything else. */ 43 int 44 getaddrinfo(const char *hostname, const char *servername, 45 const struct addrinfo *hints, struct addrinfo **res) 46 { 47 if (hostname == NULL) 48 return EAI_NONAME; 49 50 *res = NULL; 51 struct addrinfo *ai; 52 53 ai = malloc(sizeof(struct addrinfo) + sizeof(struct sockaddr)); 54 if (ai == NULL) 55 return EAI_MEMORY; 56 57 ai->ai_next = NULL; 58 ai->ai_canonname = NULL; 59 ai->ai_addr = (struct sockaddr *)(ai+1); 60 61 struct sockaddr_in *si = (struct sockaddr_in *)ai->ai_addr; 62 si->sin_len = ai->ai_addrlen = sizeof(struct sockaddr); 63 si->sin_family = ai->ai_family = AF_INET; 64 /* si->sin_port ? */ 65 66 if (hints != NULL) { 67 si->sin_family = ai->ai_family = hints->ai_family; 68 ai->ai_socktype = hints->ai_socktype; 69 } 70 71 if (inet_pton(AF_INET, hostname, &si->sin_addr.s_addr) != 1) { 72 freeaddrinfo(ai); 73 return EAI_NONAME; 74 } 75 76 *res = ai; 77 78 return 0; 79 } 80 81 void 82 freeaddrinfo(struct addrinfo *ai) 83 { 84 struct addrinfo *next; 85 86 do { 87 next = ai->ai_next; 88 if (ai->ai_canonname) 89 free(ai->ai_canonname); 90 /* no need to free(ai->ai_addr) */ 91 free(ai); 92 ai = next; 93 } while (ai); 94 } 95 96 /* Entries EAI_ADDRFAMILY (1) and EAI_NODATA (7) are obsoleted, but left */ 97 /* for backward compatibility with userland code prior to 2553bis-02 */ 98 static const char *ai_errlist[] = { 99 "Success", /* 0 */ 100 "Address family for hostname not supported", /* 1 */ 101 "Temporary failure in name resolution", /* EAI_AGAIN */ 102 "Invalid value for ai_flags", /* EAI_BADFLAGS */ 103 "Non-recoverable failure in name resolution", /* EAI_FAIL */ 104 "ai_family not supported", /* EAI_FAMILY */ 105 "Memory allocation failure", /* EAI_MEMORY */ 106 "No address associated with hostname", /* 7 */ 107 "hostname nor servname provided, or not known", /* EAI_NONAME */ 108 "servname not supported for ai_socktype", /* EAI_SERVICE */ 109 "ai_socktype not supported", /* EAI_SOCKTYPE */ 110 "System error returned in errno", /* EAI_SYSTEM */ 111 "Invalid value for hints", /* EAI_BADHINTS */ 112 "Resolved protocol is unknown", /* EAI_PROTOCOL */ 113 "Argument buffer overflow", /* EAI_OVERFLOW */ 114 }; 115 116 const char * 117 gai_strerror(int ecode) 118 { 119 if (ecode >= 0 && ecode < EAI_MAX) 120 return ai_errlist[ecode]; 121 return "Unknown error"; 122 } 123