1 /* $KAME: prefix.c,v 1.9 2001/07/02 14:36:49 itojun Exp $ */
2 /* $FreeBSD: src/usr.sbin/faithd/prefix.c,v 1.1.2.2 2002/04/28 05:40:29 suz Exp $ */
3 /* $DragonFly: src/usr.sbin/faithd/prefix.c,v 1.4 2003/11/16 14:10:45 eirikn Exp $ */
6 * Copyright (C) 2000 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project 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.
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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
34 #include <sys/types.h>
35 #include <sys/socket.h>
36 #include <netinet/in.h>
45 #define offsetof(type, member) ((size_t)(u_long)(&((type *)0)->member))
51 static int prefix_set(const char *, struct prefix *, int);
52 static struct config *config_load1(const char *);
54 static void config_show1(const struct config *);
55 static void config_show(void);
58 struct config *config_list = NULL;
60 const int niflags = NI_NUMERICHOST | NI_WITHSCOPEID;
62 const int niflags = NI_NUMERICHOST;
66 prefix_set(const char *s, struct prefix *prefix, int slash)
69 struct addrinfo hints, *res = NULL;
81 memset(&hints, 0, sizeof(hints));
82 hints.ai_family = PF_UNSPEC;
83 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
84 hints.ai_flags = AI_NUMERICHOST;
85 if (getaddrinfo(p, "0", &hints, &res))
87 if (res->ai_next || res->ai_addrlen > sizeof(prefix->a))
89 memcpy(&prefix->a, res->ai_addr, res->ai_addrlen);
91 switch (prefix->a.ss_family) {
94 a = (char *)&((struct sockaddr_in *)&prefix->a)->sin_addr;
98 a = (char *)&((struct sockaddr_in6 *)&prefix->a)->sin6_addr;
108 prefix->l = (int)strtoul(q, &r, 10);
111 if (prefix->l < 0 || prefix->l > max)
131 prefix_string(const struct prefix *prefix)
133 static char buf[NI_MAXHOST + 20];
134 char hbuf[NI_MAXHOST];
136 if (getnameinfo((const struct sockaddr *)&prefix->a, prefix->a.ss_len,
137 hbuf, sizeof(hbuf), NULL, 0, niflags))
139 snprintf(buf, sizeof(buf), "%s/%d", hbuf, prefix->l);
144 prefix_match(const struct prefix *prefix, const struct sockaddr *sa)
146 struct sockaddr_storage a, b;
150 if (prefix->a.ss_family != sa->sa_family ||
151 prefix->a.ss_len != sa->sa_len)
154 if (prefix->a.ss_len > sizeof(a) || sa->sa_len > sizeof(b))
157 switch (prefix->a.ss_family) {
159 off = offsetof(struct sockaddr_in, sin_addr);
162 off = offsetof(struct sockaddr_in6, sin6_addr);
165 if (memcmp(&prefix->a, sa, prefix->a.ss_len) != 0)
171 memcpy(&a, &prefix->a, prefix->a.ss_len);
172 memcpy(&b, sa, sa->sa_len);
173 l = prefix->l / 8 + (prefix->l % 8 ? 1 : 0);
176 if (off + l > a.ss_len)
179 pa = ((char *)&a) + off;
180 pb = ((char *)&b) + off;
182 pa[prefix->l / 8] &= 0xff00 >> (prefix->l % 8);
183 pb[prefix->l / 8] &= 0xff00 >> (prefix->l % 8);
185 if (memcmp(pa, pb, l) != 0)
192 * prefix/prefixlen permit/deny prefix/prefixlen [srcaddr]
193 * 3ffe::/16 permit 10.0.0.0/8 10.1.1.1
195 static struct config *
196 config_load1(const char *line)
204 if (strlen(line) + 1 > sizeof(buf))
206 strlcpy(buf, line, sizeof(buf));
208 p = strchr(buf, '\n');
212 p = strchr(buf, '#');
215 if (strlen(buf) == 0)
219 memset(token, 0, sizeof(token));
220 for (i = 0; i < sizeof(token) / sizeof(token[0]); i++) {
221 token[i] = strtok(p, "\t ");
223 if (token[i] == NULL)
227 if (strtok(p, "\t ") != NULL)
229 /* insufficient tokens */
238 conf = (struct config *)malloc(sizeof(*conf));
241 memset(conf, 0, sizeof(*conf));
243 if (strcasecmp(token[1], "permit") == 0)
245 else if (strcasecmp(token[1], "deny") == 0)
248 /* invalid keyword is considered as "deny" */
252 if (prefix_set(token[0], &conf->match, 1) < 0)
254 if (prefix_set(token[2], &conf->dest, 1) < 0)
257 if (prefix_set(token[3], &conf->src, 0) < 0)
269 config_load(const char *configfile)
273 struct config *conf, *p;
274 struct config sentinel;
279 configfile = _PATH_PREFIX_CONF;
280 fp = fopen(configfile, "r");
285 while (fgets(buf, sizeof(buf), fp) != NULL) {
286 conf = config_load1(buf);
292 config_list = sentinel.next;
300 config_show1(const struct config *conf)
304 p = prefix_string(&conf->match);
305 printf("%s", p ? p : "?");
312 p = prefix_string(&conf->dest);
313 printf(" %s", p ? p : "?");
323 for (conf = config_list; conf; conf = conf->next)
328 const struct config *
329 config_match(struct sockaddr *sa1, struct sockaddr *sa2)
331 static struct config conf;
332 const struct config *p;
334 if (sa1->sa_len > sizeof(conf.match.a) ||
335 sa2->sa_len > sizeof(conf.dest.a))
338 memset(&conf, 0, sizeof(conf));
341 memcpy(&conf.match.a, sa1, sa1->sa_len);
342 memcpy(&conf.dest.a, sa2, sa2->sa_len);
346 for (p = config_list; p; p = p->next)
347 if (prefix_match(&p->match, sa1) && prefix_match(&p->dest, sa2))