1 /* $NetBSD: getnameinfo.c,v 1.2 2017/01/28 21:31:50 christos Exp $ */
2
3 /*
4 * Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
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 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <config.h>
37
38 #include <krb5/roken.h>
39
40 static int
doit(int af,const void * addr,size_t addrlen,int port,char * host,size_t hostlen,char * serv,size_t servlen,int flags)41 doit (int af,
42 const void *addr,
43 size_t addrlen,
44 int port,
45 char *host, size_t hostlen,
46 char *serv, size_t servlen,
47 int flags)
48 {
49 if (host != NULL) {
50 if (flags & NI_NUMERICHOST) {
51 if (inet_ntop (af, addr, host, hostlen) == NULL)
52 return EAI_SYSTEM;
53 } else {
54 struct hostent *he = gethostbyaddr (addr,
55 addrlen,
56 af);
57 if (he != NULL) {
58 strlcpy (host, hostent_find_fqdn(he), hostlen);
59 if (flags & NI_NOFQDN) {
60 char *dot = strchr (host, '.');
61 if (dot != NULL)
62 *dot = '\0';
63 }
64 } else if (flags & NI_NAMEREQD) {
65 return EAI_NONAME;
66 } else if (inet_ntop (af, addr, host, hostlen) == NULL)
67 return EAI_SYSTEM;
68 }
69 }
70
71 if (serv != NULL) {
72 if (flags & NI_NUMERICSERV) {
73 snprintf (serv, servlen, "%u", ntohs(port));
74 } else {
75 const char *proto = "tcp";
76 struct servent *se;
77
78 if (flags & NI_DGRAM)
79 proto = "udp";
80
81 se = getservbyport (port, proto);
82 if (se == NULL) {
83 snprintf (serv, servlen, "%u", ntohs(port));
84 } else {
85 strlcpy (serv, se->s_name, servlen);
86 }
87 }
88 }
89 return 0;
90 }
91
92 /*
93 *
94 */
95
96 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
getnameinfo(const struct sockaddr * sa,socklen_t salen,char * host,size_t hostlen,char * serv,size_t servlen,int flags)97 getnameinfo(const struct sockaddr *sa, socklen_t salen,
98 char *host, size_t hostlen,
99 char *serv, size_t servlen,
100 int flags)
101 {
102 switch (sa->sa_family) {
103 #ifdef HAVE_IPV6
104 case AF_INET6 : {
105 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
106
107 return doit (AF_INET6, &sin6->sin6_addr, sizeof(sin6->sin6_addr),
108 sin6->sin6_port,
109 host, hostlen,
110 serv, servlen,
111 flags);
112 }
113 #endif
114 case AF_INET : {
115 const struct sockaddr_in *sin4 = (const struct sockaddr_in *)sa;
116
117 return doit (AF_INET, &sin4->sin_addr, sizeof(sin4->sin_addr),
118 sin4->sin_port,
119 host, hostlen,
120 serv, servlen,
121 flags);
122 }
123 default :
124 return EAI_FAMILY;
125 }
126 }
127