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.
17 void freehostport(struct hostportres *hp) {
22 freeaddrinfo(hp->addrinfo);
27 static int parsehostport(struct hostportres *hp, char *hostport, char *default_port) {
32 hp->port = default_port ? stringcopy(default_port, 0) : NULL;
36 /* allow literal addresses and port, e.g. [2001:db8::1]:1812 */
40 for (; *p && *p != ']' && *p != ' ' && *p != '\t' && *p != '\n'; p++);
42 debug(DBG_ERR, "no ] matching initial [");
48 for (; *p && *p != ':' && *p != ' ' && *p != '\t' && *p != '\n'; p++);
51 debug(DBG_ERR, "missing host/address");
55 hp->host = stringcopy(field, p - field);
58 if (*p && *p != ':' && *p != ' ' && *p != '\t' && *p != '\n') {
59 debug(DBG_ERR, "unexpected character after ]");
64 /* port number or service name is specified */;
66 for (; *p && *p != ' ' && *p != '\t' && *p != '\n'; p++);
68 debug(DBG_ERR, "syntax error, : but no following port");
71 hp->port = stringcopy(field, p - field);
73 hp->port = default_port ? stringcopy(default_port, 0) : NULL;
77 struct hostportres *newhostport(char *hostport, char *default_port, uint8_t prefixok) {
78 struct hostportres *hp;
82 hp = malloc(sizeof(struct hostportres));
84 debug(DBG_ERR, "resolve_newhostport: malloc failed");
87 memset(hp, 0, sizeof(struct hostportres));
89 if (!parsehostport(hp, hostport, default_port))
92 if (hp->host && !strcmp(hp->host, "*")) {
97 slash = hp->host ? strchr(hp->host, '/') : NULL;
100 debug(DBG_WARN, "newhostport: prefix not allowed here", hp->host);
105 debug(DBG_WARN, "newhostport: prefix length must be specified after the / in %s", hp->host);
109 if (*s < '0' || *s > '9') {
110 debug(DBG_WARN, "newhostport: %s in %s is not a valid prefix length", slash + 1, hp->host);
113 plen = atoi(slash + 1);
114 if (plen < 0 || plen > 128) {
115 debug(DBG_WARN, "newhostport: %s in %s is not a valid prefix length", slash + 1, hp->host);
118 hp->prefixlen = plen;
129 int resolvehostport(struct hostportres *hp, int socktype, uint8_t passive) {
130 struct addrinfo hints, *res;
132 memset(&hints, 0, sizeof(hints));
133 hints.ai_socktype = socktype;
134 hints.ai_family = AF_UNSPEC;
136 hints.ai_flags = AI_PASSIVE;
138 if (!hp->host && !hp->port) {
139 /* getaddrinfo() doesn't like host and port to be NULL */
140 if (getaddrinfo(hp->host, "1812" /* can be anything */, &hints, &hp->addrinfo)) {
141 debug(DBG_WARN, "resolvehostport: can't resolve (null) port (null)");
144 for (res = hp->addrinfo; res; res = res->ai_next)
145 port_set(res->ai_addr, 0);
147 if (hp->prefixlen != 255)
148 hints.ai_flags |= AI_NUMERICHOST;
149 if (getaddrinfo(hp->host, hp->port, &hints, &hp->addrinfo)) {
150 debug(DBG_WARN, "resolvehostport: can't resolve %s port %s", hp->host ? hp->host : "(null)", hp->port ? hp->port : "(null)");
153 if (hp->prefixlen != 255) {
154 switch (hp->addrinfo->ai_family) {
156 if (hp->prefixlen > 32) {
157 debug(DBG_WARN, "resolvehostport: prefix length must be <= 32 in %s", hp->host);
164 debug(DBG_WARN, "resolvehostport: prefix must be IPv4 or IPv6 in %s", hp->host);
173 freeaddrinfo(hp->addrinfo);
177 int addhostport(struct list **hostports, char *hostport, char *portdefault, uint8_t prefixok) {
178 struct hostportres *hp;
180 hp = newhostport(hostport, portdefault, prefixok);
184 *hostports = list_create();
185 if (!*hostports || !list_push(*hostports, hp)) {
187 debug(DBG_ERR, "addhostport: malloc failed");
193 void freehostports(struct list *hostports) {
194 struct hostportres *hp;
196 while ((hp = (struct hostportres *)list_shift(hostports)))
198 list_destroy(hostports);
201 int resolvehostports(struct list *hostports, int socktype) {
202 struct list_node *entry;
203 struct hostportres *hp;
205 for (entry = list_first(hostports); entry; entry = list_next(entry)) {
206 hp = (struct hostportres *)entry->data;
207 if (!hp->addrinfo && !resolvehostport(hp, socktype, 0))
213 struct addrinfo *resolvepassiveaddrinfo(char *hostport, char *default_port, int socktype) {
214 struct addrinfo *ai = NULL;
215 struct hostportres *hp = newhostport(hostport, default_port, 0);
216 if (hp && resolvehostport(hp, socktype, 1)) {
224 /* returns 1 if the len first bits are equal, else 0 */
225 static int prefixmatch(void *a1, void *a2, uint8_t len) {
226 static uint8_t mask[] = { 0, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe };
227 uint8_t r, l = len / 8;
228 if (l && memcmp(a1, a2, l))
233 return (((uint8_t *)a1)[l] & mask[r]) == (((uint8_t *)a2)[l] & mask[r]);
236 int addressmatches(struct list *hostports, struct sockaddr *addr) {
237 struct sockaddr_in6 *sa6 = NULL;
238 struct in_addr *a4 = NULL;
239 struct addrinfo *res;
240 struct list_node *entry;
241 struct hostportres *hp = NULL;
243 if (addr->sa_family == AF_INET6) {
244 sa6 = (struct sockaddr_in6 *)addr;
245 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
246 a4 = (struct in_addr *)&sa6->sin6_addr.s6_addr[12];
250 a4 = &((struct sockaddr_in *)addr)->sin_addr;
252 for (entry = list_first(hostports); entry; entry = list_next(entry)) {
253 hp = (struct hostportres *)entry->data;
254 for (res = hp->addrinfo; res; res = res->ai_next)
255 if (hp->prefixlen == 255) {
256 if ((a4 && res->ai_family == AF_INET &&
257 !memcmp(a4, &((struct sockaddr_in *)res->ai_addr)->sin_addr, 4)) ||
258 (sa6 && res->ai_family == AF_INET6 &&
259 !memcmp(&sa6->sin6_addr, &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr, 16)))
262 if ((a4 && res->ai_family == AF_INET &&
263 prefixmatch(a4, &((struct sockaddr_in *)res->ai_addr)->sin_addr, hp->prefixlen)) ||
264 (sa6 && res->ai_family == AF_INET6 &&
265 prefixmatch(&sa6->sin6_addr, &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr, hp->prefixlen)))
272 int connecttcphostlist(struct list *hostports, struct addrinfo *src) {
274 struct list_node *entry;
275 struct hostportres *hp = NULL;
277 for (entry = list_first(hostports); entry; entry = list_next(entry)) {
278 hp = (struct hostportres *)entry->data;
279 debug(DBG_WARN, "connecttcphostlist: trying to open TCP connection to %s port %s", hp->host, hp->port);
280 if ((s = connecttcp(hp->addrinfo, src)) >= 0) {
281 debug(DBG_WARN, "connecttcphostlist: TCP connection to %s port %s up", hp->host, hp->port);
285 debug(DBG_ERR, "connecttcphostlist: failed");