123 lines
4.2 KiB
C
123 lines
4.2 KiB
C
/* $KAME: getaddrinfo.c,v 1.15 2000/07/09 04:37:24 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Copyright (C) 2017 THL A29 Limited, a Tencent company.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <stdlib.h>
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#include "netinet/in.h"
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#include "arpa/inet.h"
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#include "sys/socket.h"
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#include "netdb.h"
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/* Just conver numeric hostname to int and not do anything else. */
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int
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getaddrinfo(const char *hostname, const char *servername,
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const struct addrinfo *hints, struct addrinfo **res)
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{
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if (hostname == NULL)
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return EAI_NONAME;
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*res = NULL;
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struct addrinfo *ai;
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ai = malloc(sizeof(struct addrinfo) + sizeof(struct sockaddr));
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if (ai == NULL)
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return EAI_MEMORY;
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ai->ai_next = NULL;
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ai->ai_canonname = NULL;
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ai->ai_addr = (struct sockaddr *)(ai+1);
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struct sockaddr_in *si = (struct sockaddr_in *)ai->ai_addr;
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si->sin_len = ai->ai_addrlen = sizeof(struct sockaddr);
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si->sin_family = ai->ai_family = AF_INET;
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/* si->sin_port ? */
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if (hints != NULL) {
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si->sin_family = ai->ai_family = hints->ai_family;
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ai->ai_socktype = hints->ai_socktype;
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}
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if (inet_pton(AF_INET, hostname, &si->sin_addr.s_addr) != 1) {
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freeaddrinfo(ai);
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return EAI_NONAME;
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}
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*res = ai;
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return 0;
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}
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void
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freeaddrinfo(struct addrinfo *ai)
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{
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struct addrinfo *next;
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do {
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next = ai->ai_next;
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if (ai->ai_canonname)
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free(ai->ai_canonname);
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/* no need to free(ai->ai_addr) */
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free(ai);
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ai = next;
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} while (ai);
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}
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/* Entries EAI_ADDRFAMILY (1) and EAI_NODATA (7) are obsoleted, but left */
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/* for backward compatibility with userland code prior to 2553bis-02 */
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static const char *ai_errlist[] = {
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"Success", /* 0 */
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"Address family for hostname not supported", /* 1 */
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"Temporary failure in name resolution", /* EAI_AGAIN */
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"Invalid value for ai_flags", /* EAI_BADFLAGS */
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"Non-recoverable failure in name resolution", /* EAI_FAIL */
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"ai_family not supported", /* EAI_FAMILY */
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"Memory allocation failure", /* EAI_MEMORY */
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"No address associated with hostname", /* 7 */
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"hostname nor servname provided, or not known", /* EAI_NONAME */
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"servname not supported for ai_socktype", /* EAI_SERVICE */
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"ai_socktype not supported", /* EAI_SOCKTYPE */
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"System error returned in errno", /* EAI_SYSTEM */
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"Invalid value for hints", /* EAI_BADHINTS */
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"Resolved protocol is unknown", /* EAI_PROTOCOL */
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"Argument buffer overflow", /* EAI_OVERFLOW */
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};
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const char *
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gai_strerror(int ecode)
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{
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if (ecode >= 0 && ecode < EAI_MAX)
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return ai_errlist[ecode];
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return "Unknown error";
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}
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