1/*-
2 * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
|
26 * $FreeBSD: head/lib/libutil/realhostname.c 63164 2000-07-14 18:08:19Z ume $
|
| 26 * $FreeBSD: head/lib/libutil/realhostname.c 71753 2001-01-28 21:51:25Z brian $ |
27 */
28
29#include <sys/param.h>
30
31#include <sys/socket.h>
32#include <netdb.h>
33#include <netinet/in.h>
34#include <arpa/inet.h>
35
36#include <stdio.h>
37#include <string.h>
38
39#include "libutil.h"
40
41/* wrapper for KAME-special getnameinfo() */
42#ifndef NI_WITHSCOPEID
43#define NI_WITHSCOPEID 0
44#endif
45
46struct sockinet {
47 u_char si_len;
48 u_char si_family;
49 u_short si_port;
50};
51
52int
53realhostname(char *host, size_t hsize, const struct in_addr *ip)
54{
|
| 55 char trimmed[MAXHOSTNAMELEN+1]; |
56 int result;
57 struct hostent *hp;
58
59 result = HOSTNAME_INVALIDADDR;
60 hp = gethostbyaddr((char *)ip, sizeof(*ip), AF_INET);
61
|
61 if (hp != NULL && strlen(hp->h_name) <= hsize) {
62 char lookup[MAXHOSTNAMELEN];
|
62 if (hp != NULL) {
63 strlcpy(trimmed, hp->h_name, sizeof(trimmed));
64 trimdomain(trimmed, strlen(trimmed));
65 if (strlen(trimmed) <= hsize) {
66 char lookup[MAXHOSTNAMELEN]; |
67
|
64 strncpy(lookup, hp->h_name, sizeof(lookup) - 1);
65 lookup[sizeof(lookup) - 1] = '\0';
66 hp = gethostbyname(lookup);
67 if (hp == NULL)
68 result = HOSTNAME_INVALIDNAME;
69 else for (; ; hp->h_addr_list++) {
70 if (hp->h_addr_list[0] == NULL) {
71 result = HOSTNAME_INCORRECTNAME;
72 break;
|
68 strncpy(lookup, hp->h_name, sizeof(lookup) - 1);
69 lookup[sizeof(lookup) - 1] = '\0';
70 hp = gethostbyname(lookup);
71 if (hp == NULL)
72 result = HOSTNAME_INVALIDNAME;
73 else for (; ; hp->h_addr_list++) {
74 if (*hp->h_addr_list == NULL) {
75 result = HOSTNAME_INCORRECTNAME;
76 break;
77 }
78 if (!memcmp(*hp->h_addr_list, ip, sizeof(*ip))) {
79 strncpy(host, trimmed, hsize);
80 return HOSTNAME_FOUND;
81 } |
82 }
|
74 if (!memcmp(*hp->h_addr_list, ip, sizeof(*ip))) {
75 strncpy(host, lookup, hsize);
76 return HOSTNAME_FOUND;
77 }
|
83 }
84 }
85
86 strncpy(host, inet_ntoa(*ip), hsize);
87
88 return result;
89}
90
91int
92realhostname_sa(char *host, size_t hsize, struct sockaddr *addr, int addrlen)
93{
94 int result, error;
95 char buf[NI_MAXHOST];
96
97 result = HOSTNAME_INVALIDADDR;
98
99 error = getnameinfo(addr, addrlen, buf, sizeof(buf), NULL, 0, 0);
100 if (error == 0) {
101 struct addrinfo hints, *res, *ores;
102 struct sockaddr *sa;
103
104 memset(&hints, 0, sizeof(struct addrinfo));
105 hints.ai_family =
106 (addr->sa_family == AF_INET) ? AF_INET : AF_UNSPEC;
107 hints.ai_flags = AI_CANONNAME;
108
109 error = getaddrinfo(buf, NULL, &hints, &res);
110 if (error) {
111 result = HOSTNAME_INVALIDNAME;
112 goto numeric;
113 } else for (ores = res; ; res = res->ai_next) {
114 if (res == NULL) {
115 freeaddrinfo(ores);
116 result = HOSTNAME_INCORRECTNAME;
117 goto numeric;
118 }
119 sa = res->ai_addr;
120 if (sa == NULL) {
121 freeaddrinfo(ores);
122 result = HOSTNAME_INCORRECTNAME;
123 goto numeric;
124 }
125 if (sa->sa_len == addrlen &&
126 sa->sa_family == addr->sa_family) {
127 u_int16_t port;
128
129 port = ((struct sockinet *)addr)->si_port;
130 ((struct sockinet *)addr)->si_port = 0;
131 if (!memcmp(sa, addr, sa->sa_len)) {
132 result = HOSTNAME_FOUND;
133 ((struct sockinet *)addr)->si_port =
134 port;
135 if (ores->ai_canonname == 0) {
136 freeaddrinfo(ores);
137 goto numeric;
138 }
|
134 if (strlen(ores->ai_canonname) > hsize) {
135 if (addr->sa_family == AF_INET) {
136 freeaddrinfo(ores);
137 goto numeric;
138 }
139 strncpy(buf,
140 ores->ai_canonname,
141 sizeof(buf));
142 trimdomain(buf, hsize);
143 strncpy(host, buf, hsize);
144 } else
145 strncpy(host,
146 ores->ai_canonname,
147 hsize);
|
139 strncpy(buf, ores->ai_canonname,
140 sizeof(buf));
141 trimdomain(buf, hsize);
142 strncpy(host, buf, hsize);
143 if (strlen(host) > hsize &&
144 addr->sa_family == AF_INET) {
145 freeaddrinfo(ores);
146 goto numeric;
147 } |
148 break;
149 }
150 ((struct sockinet *)addr)->si_port = port;
151 }
152#ifdef INET6
153 /*
154 * XXX IPv4 mapped IPv6 addr consideraton,
155 * specified in rfc2373.
156 */
157 if (sa->sa_family == AF_INET &&
158 addr->sa_family == AF_INET6) {
159 struct in_addr *in;
160 struct in6_addr *in6;
161
162 in = &((struct sockaddr_in *)sa)->sin_addr;
163 in6 = &((struct sockaddr_in6 *)addr)->sin6_addr;
164 if (IN6_IS_ADDR_V4MAPPED(in6) &&
165 !memcmp(&in6->s6_addr[12], in,
166 sizeof(*in))) {
167 result = HOSTNAME_FOUND;
168 if (ores->ai_canonname == 0 ||
169 strlen(ores->ai_canonname) > hsize) {
170 freeaddrinfo(ores);
171 goto numeric;
172 }
173 strncpy(host, ores->ai_canonname,
174 hsize);
175 break;
176 }
177 }
178#endif
179 }
180 freeaddrinfo(ores);
181 } else {
182 struct sockaddr_in sin;
183 numeric:
184#ifdef INET6
185 if (addr->sa_family == AF_INET6) {
186 struct sockaddr_in6 *sin6;
187
188 sin6 = (struct sockaddr_in6 *)addr;
189 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
190 memset(&sin, 0, sizeof(sin));
191 sin.sin_len = sizeof(struct sockaddr_in);
192 sin.sin_family = AF_INET;
193 sin.sin_port = sin6->sin6_port;
194 memcpy(&sin.sin_addr,
195 &sin6->sin6_addr.s6_addr[12],
196 sizeof(struct in_addr));
197 addr = (struct sockaddr *)&sin;
198 addrlen = sin.sin_len;
199 }
200 }
201#endif
202 if (getnameinfo(addr, addrlen, buf, sizeof(buf), NULL, 0,
203 NI_NUMERICHOST|NI_WITHSCOPEID) == 0)
204 strncpy(host, buf, hsize);
205 }
206
207 return result;
208}
209
210
|