1 /*
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 /*
31 * Issues to be discussed:
32 * - Thread safe-ness must be checked
33 * - Return values. There seems to be no standard for return value (RFC2133)
34 * but INRIA implementation returns EAI_xxx defined for getaddrinfo().
35 */
36
37 #if 0
38 #include <sys/types.h>
39 #include <sys/socket.h>
40 #include <netinet/in.h>
41 #include <arpa/inet.h>
42 #include <arpa/nameser.h>
43 #include <netdb.h>
44 #include <resolv.h>
45 #include <string.h>
46 #include <stddef.h>
47
48 #include "addrinfo.h"
49 #endif
50
51 #define SUCCESS 0
52 #define YES 1
53 #define NO 0
54
55 static struct gni_afd {
56 int a_af;
57 int a_addrlen;
58 int a_socklen;
59 int a_off;
60 } gni_afdl [] = {
61 #ifdef ENABLE_IPV6
62 {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
63 offsetof(struct sockaddr_in6, sin6_addr)},
64 #endif
65 {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
66 offsetof(struct sockaddr_in, sin_addr)},
67 {0, 0, 0},
68 };
69
70 struct gni_sockinet {
71 u_char si_len;
72 u_char si_family;
73 u_short si_port;
74 };
75
76 #define ENI_NOSOCKET 0
77 #define ENI_NOSERVNAME 1
78 #define ENI_NOHOSTNAME 2
79 #define ENI_MEMORY 3
80 #define ENI_SYSTEM 4
81 #define ENI_FAMILY 5
82 #define ENI_SALEN 6
83
84 /* forward declaration to make gcc happy */
85 int getnameinfo(const struct sockaddr *, size_t, char *, size_t,
86 char *, size_t, int);
87
88 int
getnameinfo(sa,salen,host,hostlen,serv,servlen,flags)89 getnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
90 const struct sockaddr *sa;
91 size_t salen;
92 char *host;
93 size_t hostlen;
94 char *serv;
95 size_t servlen;
96 int flags;
97 {
98 struct gni_afd *gni_afd;
99 struct servent *sp;
100 struct hostent *hp;
101 u_short port;
102 int family, len, i;
103 char *addr, *p;
104 u_long v4a;
105 #ifdef ENABLE_IPV6
106 u_char pfx;
107 #endif
108 int h_error;
109 char numserv[512];
110 char numaddr[512];
111
112 if (sa == NULL)
113 return ENI_NOSOCKET;
114
115 #ifdef HAVE_SOCKADDR_SA_LEN
116 len = sa->sa_len;
117 if (len != salen) return ENI_SALEN;
118 #else
119 len = salen;
120 #endif
121
122 family = sa->sa_family;
123 for (i = 0; gni_afdl[i].a_af; i++)
124 if (gni_afdl[i].a_af == family) {
125 gni_afd = &gni_afdl[i];
126 goto found;
127 }
128 return ENI_FAMILY;
129
130 found:
131 if (len != gni_afd->a_socklen) return ENI_SALEN;
132
133 port = ((struct gni_sockinet *)sa)->si_port; /* network byte order */
134 addr = (char *)sa + gni_afd->a_off;
135
136 if (serv == NULL || servlen == 0) {
137 /* what we should do? */
138 } else if (flags & NI_NUMERICSERV) {
139 sprintf(numserv, "%d", ntohs(port));
140 if (strlen(numserv) > servlen)
141 return ENI_MEMORY;
142 strcpy(serv, numserv);
143 } else {
144 sp = getservbyport(port, (flags & NI_DGRAM) ? "udp" : "tcp");
145 if (sp) {
146 if (strlen(sp->s_name) > servlen)
147 return ENI_MEMORY;
148 strcpy(serv, sp->s_name);
149 } else
150 return ENI_NOSERVNAME;
151 }
152
153 switch (sa->sa_family) {
154 case AF_INET:
155 v4a = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
156 if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
157 flags |= NI_NUMERICHOST;
158 v4a >>= IN_CLASSA_NSHIFT;
159 if (v4a == 0 || v4a == IN_LOOPBACKNET)
160 flags |= NI_NUMERICHOST;
161 break;
162 #ifdef ENABLE_IPV6
163 case AF_INET6:
164 pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr[0];
165 if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
166 flags |= NI_NUMERICHOST;
167 break;
168 #endif
169 }
170 if (host == NULL || hostlen == 0) {
171 /* what should we do? */
172 } else if (flags & NI_NUMERICHOST) {
173 if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr))
174 == NULL)
175 return ENI_SYSTEM;
176 if (strlen(numaddr) > hostlen)
177 return ENI_MEMORY;
178 strcpy(host, numaddr);
179 } else {
180 #ifdef ENABLE_IPV6
181 hp = getipnodebyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af, &h_error);
182 #else
183 hp = gethostbyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af);
184 h_error = h_errno;
185 #endif
186
187 if (hp) {
188 if (flags & NI_NOFQDN) {
189 p = strchr(hp->h_name, '.');
190 if (p) *p = '\0';
191 }
192 if (strlen(hp->h_name) > hostlen) {
193 #ifdef ENABLE_IPV6
194 freehostent(hp);
195 #endif
196 return ENI_MEMORY;
197 }
198 strcpy(host, hp->h_name);
199 #ifdef ENABLE_IPV6
200 freehostent(hp);
201 #endif
202 } else {
203 if (flags & NI_NAMEREQD)
204 return ENI_NOHOSTNAME;
205 if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr))
206 == NULL)
207 return ENI_NOHOSTNAME;
208 if (strlen(numaddr) > hostlen)
209 return ENI_MEMORY;
210 strcpy(host, numaddr);
211 }
212 }
213 return SUCCESS;
214 }
215