sockaddr_snprintf.c revision 1.8 1 /* $NetBSD: sockaddr_snprintf.c,v 1.8 2007/07/24 08:45:45 dyoung Exp $ */
2
3 /*-
4 * Copyright (c) 2004 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
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 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the NetBSD
21 * Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38 #include <sys/cdefs.h>
39 #if defined(LIBC_SCCS) && !defined(lint)
40 __RCSID("$NetBSD: sockaddr_snprintf.c,v 1.8 2007/07/24 08:45:45 dyoung Exp $");
41 #endif /* LIBC_SCCS and not lint */
42
43 #include <sys/types.h>
44 #include <sys/socket.h>
45 #include <sys/un.h>
46
47 #include <netinet/in.h>
48 #include <netatalk/at.h>
49 #include <net/if_dl.h>
50
51 #include <stdio.h>
52 #include <string.h>
53 #include <errno.h>
54 #include <util.h>
55 #include <netdb.h>
56
57 int
58 sockaddr_snprintf(char * const sbuf, const size_t len, const char * const fmt,
59 const struct sockaddr * const sa)
60 {
61 const void *a = NULL;
62 char abuf[1024], nbuf[1024], *addr = NULL, *w = NULL;
63 char Abuf[1024], pbuf[32], *name = NULL, *port = NULL;
64 char *ebuf = &sbuf[len - 1], *buf = sbuf;
65 const char *ptr, *s;
66 int p = -1;
67 const struct sockaddr_at *sat = NULL;
68 const struct sockaddr_in *sin4 = NULL;
69 const struct sockaddr_in6 *sin6 = NULL;
70 const struct sockaddr_un *sun = NULL;
71 const struct sockaddr_dl *sdl = NULL;
72 int na = 1;
73
74 #define ADDC(c) do { if (buf < ebuf) *buf++ = c; else buf++; } \
75 while (/*CONSTCOND*/0)
76 #define ADDS(p) do { for (s = p; *s; s++) ADDC(*s); } \
77 while (/*CONSTCOND*/0)
78 #define ADDNA() do { if (na) ADDS("N/A"); } \
79 while (/*CONSTCOND*/0)
80
81 switch (sa->sa_family) {
82 case AF_UNSPEC:
83 goto done;
84 case AF_APPLETALK:
85 sat = ((const struct sockaddr_at *)(const void *)sa);
86 p = ntohs(sat->sat_port);
87 (void)snprintf(addr = abuf, sizeof(abuf), "%u.%u",
88 ntohs(sat->sat_addr.s_net), sat->sat_addr.s_node);
89 (void)snprintf(port = pbuf, sizeof(pbuf), "%d", p);
90 break;
91 case AF_LOCAL:
92 sun = ((const struct sockaddr_un *)(const void *)sa);
93 (void)strlcpy(addr = abuf, sun->sun_path, SUN_LEN(sun));
94 break;
95 case AF_INET:
96 sin4 = ((const struct sockaddr_in *)(const void *)sa);
97 p = ntohs(sin4->sin_port);
98 a = &sin4->sin_addr;
99 break;
100 case AF_INET6:
101 sin6 = ((const struct sockaddr_in6 *)(const void *)sa);
102 p = ntohs(sin6->sin6_port);
103 a = &sin6->sin6_addr;
104 break;
105 case AF_LINK:
106 sdl = ((const struct sockaddr_dl *)(const void *)sa);
107 (void)strlcpy(addr = abuf, link_ntoa(sdl), sizeof(abuf));
108 if ((w = strchr(addr, ':')) != 0) {
109 *w++ = '\0';
110 addr = w;
111 }
112 break;
113 default:
114 errno = EAFNOSUPPORT;
115 return -1;
116 }
117
118 if (addr == abuf)
119 name = addr;
120
121 if (a && getnameinfo(sa, (socklen_t)sa->sa_len, addr = abuf,
122 (unsigned int)sizeof(abuf), NULL, 0,
123 NI_NUMERICHOST|NI_NUMERICSERV) != 0)
124 return -1;
125
126 for (ptr = fmt; *ptr; ptr++) {
127 if (*ptr != '%') {
128 ADDC(*ptr);
129 continue;
130 }
131 next_char:
132 switch (*++ptr) {
133 case '?':
134 na = 0;
135 goto next_char;
136 case 'a':
137 ADDS(addr);
138 break;
139 case 'p':
140 if (p != -1) {
141 (void)snprintf(nbuf, sizeof(nbuf), "%d", p);
142 ADDS(nbuf);
143 } else
144 ADDNA();
145 break;
146 case 'f':
147 (void)snprintf(nbuf, sizeof(nbuf), "%d", sa->sa_family);
148 ADDS(nbuf);
149 break;
150 case 'l':
151 (void)snprintf(nbuf, sizeof(nbuf), "%d", sa->sa_len);
152 ADDS(nbuf);
153 break;
154 case 'A':
155 if (name)
156 ADDS(name);
157 else if (!a)
158 ADDNA();
159 else {
160 getnameinfo(sa, (socklen_t)sa->sa_len,
161 name = Abuf,
162 (unsigned int)sizeof(nbuf), NULL, 0, 0);
163 ADDS(name);
164 }
165 break;
166 case 'P':
167 if (port)
168 ADDS(port);
169 else if (p == -1)
170 ADDNA();
171 else {
172 getnameinfo(sa, (socklen_t)sa->sa_len, NULL, 0,
173 port = pbuf,
174 (unsigned int)sizeof(pbuf), 0);
175 ADDS(port);
176 }
177 break;
178 case 'I':
179 if (sdl && addr != abuf) {
180 ADDS(abuf);
181 } else {
182 ADDNA();
183 }
184 break;
185 case 'F':
186 if (sin6) {
187 (void)snprintf(nbuf, sizeof(nbuf), "%d",
188 sin6->sin6_flowinfo);
189 ADDS(nbuf);
190 break;
191 } else {
192 ADDNA();
193 }
194 break;
195 case 'S':
196 if (sin6) {
197 (void)snprintf(nbuf, sizeof(nbuf), "%d",
198 sin6->sin6_scope_id);
199 ADDS(nbuf);
200 break;
201 } else {
202 ADDNA();
203 }
204 break;
205 case 'R':
206 if (sat) {
207 const struct netrange *n =
208 &sat->sat_range.r_netrange;
209 (void)snprintf(nbuf, sizeof(nbuf),
210 "%d:[%d,%d]", n->nr_phase , n->nr_firstnet,
211 n->nr_lastnet);
212 ADDS(nbuf);
213 } else {
214 ADDNA();
215 }
216 break;
217 default:
218 ADDC('%');
219 if (na == 0)
220 ADDC('?');
221 if (*ptr == '\0')
222 goto done;
223 /*FALLTHROUGH*/
224 case '%':
225 ADDC(*ptr);
226 break;
227 }
228 na = 1;
229 }
230 done:
231 if (buf < ebuf)
232 *buf = '\0';
233 else if (len != 0)
234 sbuf[len - 1] = '\0';
235 return (int)(buf - sbuf);
236 }
237