/[svn]/ircd-hybrid-7.2/src/irc_getnameinfo.c
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Contents of /ircd-hybrid-7.2/src/irc_getnameinfo.c

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Revision 34 - (show annotations)
Sun Oct 2 21:05:51 2005 UTC (15 years, 5 months ago) by lusky
File MIME type: text/x-chdr
File size: 6574 byte(s)
create 7.2 branch, we can move/rename it as needed.


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 * - RFC2553 says that we should raise error on short buffer. X/Open says
34 * we need to truncate the result. We obey RFC2553 (and X/Open should be
35 * modified). ipngwg rough consensus seems to follow RFC2553.
36 * - What is "local" in NI_FQDN?
37 * - NI_NAMEREQD and NI_NUMERICHOST conflict with each other.
38 * - (KAME extension) always attach textual scopeid (fe80::1%lo0), if
39 * sin6_scope_id is filled - standardization status?
40 * XXX breaks backward compat for code that expects no scopeid.
41 * beware on merge.
42 */
43
44 #include "stdinc.h"
45
46 #include "irc_getnameinfo.h"
47 #include "irc_string.h"
48
49 /* $Id$ */
50
51 static const struct afd {
52 int a_af;
53 int a_addrlen;
54 socklen_t a_socklen;
55 int a_off;
56 } afdl [] = {
57 #ifdef IPV6
58 {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
59 offsetof(struct sockaddr_in6, sin6_addr)},
60 #endif
61 {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
62 offsetof(struct sockaddr_in, sin_addr)},
63 {0, 0, 0, 0},
64 };
65
66 struct sockinet
67 {
68 unsigned char si_len;
69 unsigned char si_family;
70 unsigned short si_port;
71 };
72
73 #ifdef IPV6
74 static int ip6_parsenumeric(const struct sockaddr *, const char *, char *,
75 size_t, int);
76 #endif
77
78 int
79 irc_getnameinfo(const struct sockaddr *sa, socklen_t salen, char *host,
80 size_t hostlen, char *serv, size_t servlen, int flags)
81 {
82 const struct afd *afd;
83 struct servent *sp;
84 unsigned short port;
85 int family, i;
86 const char *addr;
87 u_int32_t v4a;
88 char numserv[512];
89 char numaddr[512];
90
91 if (sa == NULL)
92 return EAI_FAIL;
93
94 /* if (sa->sa_len != salen)
95 return EAI_FAIL;
96 */
97 family = sa->sa_family;
98 for (i = 0; afdl[i].a_af; i++)
99 if (afdl[i].a_af == family) {
100 afd = &afdl[i];
101 goto found;
102 }
103 return EAI_FAMILY;
104
105 found:
106 if (salen != afd->a_socklen)
107 return EAI_FAIL;
108
109 /* network byte order */
110 port = ((const struct sockinet *)sa)->si_port;
111 addr = (const char *)sa + afd->a_off;
112
113 if (serv == NULL || servlen == 0) {
114 /*
115 * do nothing in this case.
116 * in case you are wondering if "&&" is more correct than
117 * "||" here: rfc2553bis-03 says that serv == NULL OR
118 * servlen == 0 means that the caller does not want the result.
119 */
120 } else {
121 if (flags & NI_NUMERICSERV)
122 sp = NULL;
123 else {
124 sp = getservbyport(port,
125 (flags & NI_DGRAM) ? "udp" : "tcp");
126 }
127 if (sp) {
128 if (strlen(sp->s_name) + 1 > servlen)
129 return EAI_MEMORY;
130 strlcpy(serv, sp->s_name, servlen);
131 } else {
132 snprintf(numserv, sizeof(numserv), "%u", ntohs(port));
133 if (strlen(numserv) + 1 > servlen)
134 return EAI_MEMORY;
135 strlcpy(serv, numserv, servlen);
136 }
137 }
138
139 switch (sa->sa_family) {
140 case AF_INET:
141 v4a = (u_int32_t)
142 ntohl(((const struct sockaddr_in *)sa)->sin_addr.s_addr);
143 if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
144 flags |= NI_NUMERICHOST;
145 v4a >>= IN_CLASSA_NSHIFT;
146 if (v4a == 0)
147 flags |= NI_NUMERICHOST;
148 break;
149 #ifdef IPV6
150 case AF_INET6:
151 {
152 const struct sockaddr_in6 *sin6;
153 sin6 = (const struct sockaddr_in6 *)sa;
154 switch (sin6->sin6_addr.s6_addr[0]) {
155 case 0x00:
156 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
157 ;
158 else if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
159 ;
160 else
161 flags |= NI_NUMERICHOST;
162 break;
163 default:
164 if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
165 flags |= NI_NUMERICHOST;
166 }
167 else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
168 flags |= NI_NUMERICHOST;
169 break;
170 }
171 }
172 break;
173 #endif
174 }
175 if (host == NULL || hostlen == 0) {
176 /*
177 * do nothing in this case.
178 * in case you are wondering if "&&" is more correct than
179 * "||" here: rfc2553bis-03 says that host == NULL or
180 * hostlen == 0 means that the caller does not want the result.
181 */
182 } else if (flags & NI_NUMERICHOST) {
183 size_t numaddrlen;
184
185 /* NUMERICHOST and NAMEREQD conflicts with each other */
186 if (flags & NI_NAMEREQD)
187 return EAI_NONAME;
188
189 switch(afd->a_af) {
190 #ifdef IPV6
191 case AF_INET6:
192 {
193 int error;
194
195 if ((error = ip6_parsenumeric(sa, addr, host,
196 hostlen, flags)) != 0)
197 return(error);
198 break;
199 }
200 #endif
201 default:
202 if (inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr))
203 == NULL)
204 return EAI_SYSTEM;
205 numaddrlen = strlen(numaddr);
206 if (numaddrlen + 1 > hostlen) /* don't forget terminator */
207 return EAI_MEMORY;
208 strlcpy(host, numaddr, hostlen);
209 break;
210 }
211 }
212 return(0);
213 }
214
215 #ifdef IPV6
216 static int
217 ip6_parsenumeric(const struct sockaddr *sa, const char *addr,
218 char *host, size_t hostlen, int flags)
219 {
220 size_t numaddrlen;
221 char numaddr[512];
222
223 if (inet_ntop(AF_INET6, addr, numaddr, sizeof(numaddr)) == NULL)
224 return(EAI_SYSTEM);
225
226 numaddrlen = strlen(numaddr);
227
228 if (numaddrlen + 1 > hostlen) /* don't forget terminator */
229 return(EAI_MEMORY);
230
231 if (*numaddr == ':')
232 {
233 *host = '0';
234 strlcpy(host+1, numaddr, hostlen-1);
235 }
236 else
237 strlcpy(host, numaddr, hostlen);
238
239 return(0);
240 }
241 #endif

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