2 * Copyright (C) 2006-2009 Stig Venaas <venaas@uninett.no>
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
13 #include <netinet/in.h>
19 void freehostport(struct hostportres *hp) {
24 freeaddrinfo(hp->addrinfo);
29 static int parsehostport(struct hostportres *hp, char *hostport, char *default_port) {
34 hp->port = default_port ? stringcopy(default_port, 0) : NULL;
38 /* allow literal addresses and port, e.g. [2001:db8::1]:1812 */
42 for (; *p && *p != ']' && *p != ' ' && *p != '\t' && *p != '\n'; p++);
44 debug(DBG_ERR, "no ] matching initial [");
50 for (; *p && *p != ':' && *p != '/' && *p != ' ' && *p != '\t' && *p != '\n'; p++);
53 debug(DBG_ERR, "missing host/address");
57 hp->host = stringcopy(field, p - field);
60 if (*p && *p != ':' && *p != '/' && *p != ' ' && *p != '\t' && *p != '\n') {
61 debug(DBG_ERR, "unexpected character after ]");
66 /* port number or service name is specified */;
68 for (; *p && *p != ' ' && *p != '\t' && *p != '\n'; p++);
70 debug(DBG_ERR, "syntax error, : but no following port");
73 hp->port = stringcopy(field, p - field);
75 hp->port = default_port ? stringcopy(default_port, 0) : NULL;
79 struct hostportres *newhostport(char *hostport, char *default_port, uint8_t prefixok) {
80 struct hostportres *hp;
84 hp = malloc(sizeof(struct hostportres));
86 debug(DBG_ERR, "resolve_newhostport: malloc failed");
89 memset(hp, 0, sizeof(struct hostportres));
91 if (!parsehostport(hp, hostport, default_port))
94 if (hp->host && !strcmp(hp->host, "*")) {
99 slash = hostport ? strchr(hostport, '/') : NULL;
102 debug(DBG_WARN, "newhostport: prefix not allowed here", hp->host);
107 debug(DBG_WARN, "newhostport: prefix length must be specified after the / in %s", hp->host);
111 if (*s < '0' || *s > '9') {
112 debug(DBG_WARN, "newhostport: %s in %s is not a valid prefix length", slash + 1, hp->host);
115 plen = atoi(slash + 1);
116 if (plen < 0 || plen > 128) {
117 debug(DBG_WARN, "newhostport: %s in %s is not a valid prefix length", slash + 1, hp->host);
120 hp->prefixlen = plen;
130 int resolvehostport(struct hostportres *hp, int socktype, uint8_t passive) {
131 struct addrinfo hints, *res;
133 memset(&hints, 0, sizeof(hints));
134 hints.ai_socktype = socktype;
135 hints.ai_family = AF_UNSPEC;
137 hints.ai_flags = AI_PASSIVE;
139 if (!hp->host && !hp->port) {
140 /* getaddrinfo() doesn't like host and port to be NULL */
141 if (getaddrinfo(hp->host, "1812" /* can be anything */, &hints, &hp->addrinfo)) {
142 debug(DBG_WARN, "resolvehostport: can't resolve (null) port (null)");
145 for (res = hp->addrinfo; res; res = res->ai_next)
146 port_set(res->ai_addr, 0);
148 if (hp->prefixlen != 255)
149 hints.ai_flags |= AI_NUMERICHOST;
150 if (getaddrinfo(hp->host, hp->port, &hints, &hp->addrinfo)) {
151 debug(DBG_WARN, "resolvehostport: can't resolve %s port %s", hp->host ? hp->host : "(null)", hp->port ? hp->port : "(null)");
154 if (hp->prefixlen != 255) {
155 switch (hp->addrinfo->ai_family) {
157 if (hp->prefixlen > 32) {
158 debug(DBG_WARN, "resolvehostport: prefix length must be <= 32 in %s", hp->host);
165 debug(DBG_WARN, "resolvehostport: prefix must be IPv4 or IPv6 in %s", hp->host);
174 freeaddrinfo(hp->addrinfo);
178 int addhostport(struct list **hostports, char **hostport, char *portdefault, uint8_t prefixok) {
179 struct hostportres *hp;
183 *hostports = list_create();
185 debug(DBG_ERR, "addhostport: malloc failed");
190 for (i = 0; hostport[i]; i++) {
191 hp = newhostport(hostport[i], portdefault, prefixok);
194 if (!list_push(*hostports, hp)) {
196 debug(DBG_ERR, "addhostport: malloc failed");
203 void freehostports(struct list *hostports) {
204 struct hostportres *hp;
206 while ((hp = (struct hostportres *)list_shift(hostports)))
208 list_destroy(hostports);
211 int resolvehostports(struct list *hostports, int socktype) {
212 struct list_node *entry;
213 struct hostportres *hp;
215 for (entry = list_first(hostports); entry; entry = list_next(entry)) {
216 hp = (struct hostportres *)entry->data;
217 if (!hp->addrinfo && !resolvehostport(hp, socktype, 0))
223 struct addrinfo *resolvepassiveaddrinfo(char *hostport, char *default_port, int socktype) {
224 struct addrinfo *ai = NULL;
225 struct hostportres *hp = newhostport(hostport, default_port, 0);
226 if (hp && resolvehostport(hp, socktype, 1)) {
234 /* returns 1 if the len first bits are equal, else 0 */
235 static int prefixmatch(void *a1, void *a2, uint8_t len) {
236 static uint8_t mask[] = { 0, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe };
237 uint8_t r, l = len / 8;
238 if (l && memcmp(a1, a2, l))
243 return (((uint8_t *)a1)[l] & mask[r]) == (((uint8_t *)a2)[l] & mask[r]);
246 int addressmatches(struct list *hostports, struct sockaddr *addr) {
247 struct sockaddr_in6 *sa6 = NULL;
248 struct in_addr *a4 = NULL;
249 struct addrinfo *res;
250 struct list_node *entry;
251 struct hostportres *hp = NULL;
253 if (addr->sa_family == AF_INET6) {
254 sa6 = (struct sockaddr_in6 *)addr;
255 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
256 a4 = (struct in_addr *)&sa6->sin6_addr.s6_addr[12];
260 a4 = &((struct sockaddr_in *)addr)->sin_addr;
262 for (entry = list_first(hostports); entry; entry = list_next(entry)) {
263 hp = (struct hostportres *)entry->data;
264 for (res = hp->addrinfo; res; res = res->ai_next)
265 if (hp->prefixlen == 255) {
266 if ((a4 && res->ai_family == AF_INET &&
267 !memcmp(a4, &((struct sockaddr_in *)res->ai_addr)->sin_addr, 4)) ||
268 (sa6 && res->ai_family == AF_INET6 &&
269 !memcmp(&sa6->sin6_addr, &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr, 16)))
272 if ((a4 && res->ai_family == AF_INET &&
273 prefixmatch(a4, &((struct sockaddr_in *)res->ai_addr)->sin_addr, hp->prefixlen)) ||
274 (sa6 && res->ai_family == AF_INET6 &&
275 prefixmatch(&sa6->sin6_addr, &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr, hp->prefixlen)))
282 int connecttcphostlist(struct list *hostports, struct addrinfo *src) {
284 struct list_node *entry;
285 struct hostportres *hp = NULL;
287 for (entry = list_first(hostports); entry; entry = list_next(entry)) {
288 hp = (struct hostportres *)entry->data;
289 debug(DBG_WARN, "connecttcphostlist: trying to open TCP connection to %s port %s", hp->host, hp->port);
290 if ((s = connecttcp(hp->addrinfo, src, list_count(hostports) > 1 ? 5 : 30)) >= 0) {
291 debug(DBG_WARN, "connecttcphostlist: TCP connection to %s port %s up", hp->host, hp->port);
295 debug(DBG_ERR, "connecttcphostlist: failed");