1 /*
2 * Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include <config.h>
35
36 #include "roken.h"
37
38 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)39 doit (int af,
40 const void *addr,
41 size_t addrlen,
42 int port,
43 char *host, size_t hostlen,
44 char *serv, size_t servlen,
45 int flags)
46 {
47 if (host != NULL) {
48 if (flags & NI_NUMERICHOST) {
49 if (inet_ntop (af, addr, host, hostlen) == NULL)
50 return EAI_SYSTEM;
51 } else {
52 struct hostent *he = gethostbyaddr (addr,
53 addrlen,
54 af);
55 if (he != NULL) {
56 strlcpy (host, hostent_find_fqdn(he), hostlen);
57 if (flags & NI_NOFQDN) {
58 char *dot = strchr (host, '.');
59 if (dot != NULL)
60 *dot = '\0';
61 }
62 } else if (flags & NI_NAMEREQD) {
63 return EAI_NONAME;
64 } else if (inet_ntop (af, addr, host, hostlen) == NULL)
65 return EAI_SYSTEM;
66 }
67 }
68
69 if (serv != NULL) {
70 if (flags & NI_NUMERICSERV) {
71 snprintf (serv, servlen, "%u", ntohs(port));
72 } else {
73 const char *proto = "tcp";
74 struct servent *se;
75
76 if (flags & NI_DGRAM)
77 proto = "udp";
78
79 se = getservbyport (port, proto);
80 if (se == NULL) {
81 snprintf (serv, servlen, "%u", ntohs(port));
82 } else {
83 strlcpy (serv, se->s_name, servlen);
84 }
85 }
86 }
87 return 0;
88 }
89
90 /*
91 *
92 */
93
94 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)95 getnameinfo(const struct sockaddr *sa, socklen_t salen,
96 char *host, size_t hostlen,
97 char *serv, size_t servlen,
98 int flags)
99 {
100 switch (sa->sa_family) {
101 #ifdef HAVE_IPV6
102 case AF_INET6 : {
103 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
104
105 return doit (AF_INET6, &sin6->sin6_addr, sizeof(sin6->sin6_addr),
106 sin6->sin6_port,
107 host, hostlen,
108 serv, servlen,
109 flags);
110 }
111 #endif
112 case AF_INET : {
113 const struct sockaddr_in *sin4 = (const struct sockaddr_in *)sa;
114
115 return doit (AF_INET, &sin4->sin_addr, sizeof(sin4->sin_addr),
116 sin4->sin_port,
117 host, hostlen,
118 serv, servlen,
119 flags);
120 }
121 default :
122 return EAI_FAMILY;
123 }
124 }
125