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) 2017-2021 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 /* FIXME: to support IPv6 */
43 /* Just conver numeric hostname to int and not do anything else. */
44 int
getaddrinfo(const char * hostname,const char * servername,const struct addrinfo * hints,struct addrinfo ** res)45 getaddrinfo(const char *hostname, const char *servername,
46 const struct addrinfo *hints, struct addrinfo **res)
47 {
48 if (hostname == NULL)
49 return EAI_NONAME;
50
51 *res = NULL;
52 struct addrinfo *ai;
53
54 ai = malloc(sizeof(struct addrinfo) + sizeof(struct sockaddr));
55 if (ai == NULL)
56 return EAI_MEMORY;
57
58 ai->ai_next = NULL;
59 ai->ai_canonname = NULL;
60 ai->ai_addr = (struct sockaddr *)(ai+1);
61
62 struct sockaddr_in *si = (struct sockaddr_in *)ai->ai_addr;
63 si->sin_len = ai->ai_addrlen = sizeof(struct sockaddr);
64 si->sin_family = ai->ai_family = AF_INET;
65 /* si->sin_port ? */
66
67 if (hints != NULL) {
68 si->sin_family = ai->ai_family = hints->ai_family;
69 ai->ai_socktype = hints->ai_socktype;
70 }
71
72 if (inet_pton(AF_INET, hostname, &si->sin_addr.s_addr) != 1) {
73 freeaddrinfo(ai);
74 return EAI_NONAME;
75 }
76
77 *res = ai;
78
79 return 0;
80 }
81
82 void
freeaddrinfo(struct addrinfo * ai)83 freeaddrinfo(struct addrinfo *ai)
84 {
85 struct addrinfo *next;
86
87 do {
88 next = ai->ai_next;
89 if (ai->ai_canonname)
90 free(ai->ai_canonname);
91 /* no need to free(ai->ai_addr) */
92 free(ai);
93 ai = next;
94 } while (ai);
95 }
96
97 /* Entries EAI_ADDRFAMILY (1) and EAI_NODATA (7) are obsoleted, but left */
98 /* for backward compatibility with userland code prior to 2553bis-02 */
99 static const char *ai_errlist[] = {
100 "Success", /* 0 */
101 "Address family for hostname not supported", /* 1 */
102 "Temporary failure in name resolution", /* EAI_AGAIN */
103 "Invalid value for ai_flags", /* EAI_BADFLAGS */
104 "Non-recoverable failure in name resolution", /* EAI_FAIL */
105 "ai_family not supported", /* EAI_FAMILY */
106 "Memory allocation failure", /* EAI_MEMORY */
107 "No address associated with hostname", /* 7 */
108 "hostname nor servname provided, or not known", /* EAI_NONAME */
109 "servname not supported for ai_socktype", /* EAI_SERVICE */
110 "ai_socktype not supported", /* EAI_SOCKTYPE */
111 "System error returned in errno", /* EAI_SYSTEM */
112 "Invalid value for hints", /* EAI_BADHINTS */
113 "Resolved protocol is unknown", /* EAI_PROTOCOL */
114 "Argument buffer overflow", /* EAI_OVERFLOW */
115 };
116
117 const char *
gai_strerror(int ecode)118 gai_strerror(int ecode)
119 {
120 if (ecode >= 0 && ecode < EAI_MAX)
121 return ai_errlist[ecode];
122 return "Unknown error";
123 }
124