1 /* Copyright (c) 2007-2009, UNINETT AS
2 * Copyright (c) 2012, NORDUnet A/S */
3 /* See LICENSE for licensing information. */
9 #include <netinet/in.h>
15 void freehostport(struct hostportres *hp) {
20 freeaddrinfo(hp->addrinfo);
25 static int parsehostport(struct hostportres *hp, char *hostport, char *default_port) {
30 hp->port = default_port ? stringcopy(default_port, 0) : NULL;
34 /* allow literal addresses and port, e.g. [2001:db8::1]:1812 */
38 for (; *p && *p != ']' && *p != ' ' && *p != '\t' && *p != '\n'; p++);
40 debug(DBG_ERR, "no ] matching initial [");
46 for (; *p && *p != ':' && *p != '/' && *p != ' ' && *p != '\t' && *p != '\n'; p++);
49 debug(DBG_ERR, "missing host/address");
53 hp->host = stringcopy(field, p - field);
56 if (*p && *p != ':' && *p != '/' && *p != ' ' && *p != '\t' && *p != '\n') {
57 debug(DBG_ERR, "unexpected character after ]");
62 /* port number or service name is specified */;
64 for (; *p && *p != ' ' && *p != '\t' && *p != '\n'; p++);
66 debug(DBG_ERR, "syntax error, : but no following port");
69 hp->port = stringcopy(field, p - field);
71 hp->port = default_port ? stringcopy(default_port, 0) : NULL;
75 struct hostportres *newhostport(char *hostport, char *default_port, uint8_t prefixok) {
76 struct hostportres *hp;
80 hp = malloc(sizeof(struct hostportres));
82 debug(DBG_ERR, "resolve_newhostport: malloc failed");
85 memset(hp, 0, sizeof(struct hostportres));
87 if (!parsehostport(hp, hostport, default_port))
90 if (hp->host && !strcmp(hp->host, "*")) {
95 slash = hostport ? strchr(hostport, '/') : NULL;
98 debug(DBG_WARN, "newhostport: prefix not allowed here", hp->host);
103 debug(DBG_WARN, "newhostport: prefix length must be specified after the / in %s", hp->host);
107 if (*s < '0' || *s > '9') {
108 debug(DBG_WARN, "newhostport: %s in %s is not a valid prefix length", slash + 1, hp->host);
111 plen = atoi(slash + 1);
112 if (plen < 0 || plen > 128) {
113 debug(DBG_WARN, "newhostport: %s in %s is not a valid prefix length", slash + 1, hp->host);
116 hp->prefixlen = plen;
126 int resolvehostport(struct hostportres *hp, int af, int socktype, uint8_t passive) {
127 struct addrinfo hints, *res;
129 memset(&hints, 0, sizeof(hints));
130 hints.ai_socktype = socktype;
131 hints.ai_family = af;
133 hints.ai_flags = AI_PASSIVE;
135 if (!hp->host && !hp->port) {
136 /* getaddrinfo() doesn't like host and port to be NULL */
137 if (getaddrinfo(hp->host, "1812" /* can be anything */, &hints, &hp->addrinfo)) {
138 debug(DBG_WARN, "resolvehostport: can't resolve (null) port (null)");
141 for (res = hp->addrinfo; res; res = res->ai_next)
142 port_set(res->ai_addr, 0);
144 if (hp->prefixlen != 255)
145 hints.ai_flags |= AI_NUMERICHOST;
146 if (getaddrinfo(hp->host, hp->port, &hints, &hp->addrinfo)) {
147 debug(DBG_WARN, "resolvehostport: can't resolve %s port %s", hp->host ? hp->host : "(null)", hp->port ? hp->port : "(null)");
150 if (hp->prefixlen != 255) {
151 switch (hp->addrinfo->ai_family) {
153 if (hp->prefixlen > 32) {
154 debug(DBG_WARN, "resolvehostport: prefix length must be <= 32 in %s", hp->host);
161 debug(DBG_WARN, "resolvehostport: prefix must be IPv4 or IPv6 in %s", hp->host);
166 debug(DBG_DBG, "%s: %s -> %s", __func__, hp->host, addr2string(hp->addrinfo->ai_addr));
171 freeaddrinfo(hp->addrinfo);
175 int addhostport(struct list **hostports, char **hostport, char *portdefault, uint8_t prefixok) {
176 struct hostportres *hp;
180 *hostports = list_create();
182 debug(DBG_ERR, "addhostport: malloc failed");
187 for (i = 0; hostport[i]; i++) {
188 hp = newhostport(hostport[i], portdefault, prefixok);
191 if (!list_push(*hostports, hp)) {
193 debug(DBG_ERR, "addhostport: malloc failed");
200 void freehostports(struct list *hostports) {
201 struct hostportres *hp;
203 while ((hp = (struct hostportres *)list_shift(hostports)))
205 list_destroy(hostports);
208 int resolvehostports(struct list *hostports, int af, int socktype) {
209 struct list_node *entry;
210 struct hostportres *hp;
212 for (entry = list_first(hostports); entry; entry = list_next(entry)) {
213 hp = (struct hostportres *)entry->data;
214 if (!hp->addrinfo && !resolvehostport(hp, af, socktype, 0))
220 struct addrinfo *resolvepassiveaddrinfo(char *hostport, int af, char *default_port, int socktype) {
221 struct addrinfo *ai = NULL;
222 struct hostportres *hp = newhostport(hostport, default_port, 0);
223 if (hp && resolvehostport(hp, af, socktype, 1)) {
231 /* returns 1 if the len first bits are equal, else 0 */
232 static int prefixmatch(void *a1, void *a2, uint8_t len) {
233 static uint8_t mask[] = { 0, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe };
234 uint8_t r, l = len / 8;
235 if (l && memcmp(a1, a2, l))
240 return (((uint8_t *)a1)[l] & mask[r]) == (((uint8_t *)a2)[l] & mask[r]);
243 int addressmatches(struct list *hostports, struct sockaddr *addr, uint8_t checkport) {
244 struct sockaddr_in6 *sa6 = NULL;
245 struct in_addr *a4 = NULL;
246 struct addrinfo *res;
247 struct list_node *entry;
248 struct hostportres *hp = NULL;
250 if (addr->sa_family == AF_INET6) {
251 sa6 = (struct sockaddr_in6 *)addr;
252 if (IN6_IS_ADDR_V4MAPPED(&sa6->sin6_addr)) {
253 a4 = (struct in_addr *)&sa6->sin6_addr.s6_addr[12];
257 a4 = &((struct sockaddr_in *)addr)->sin_addr;
259 for (entry = list_first(hostports); entry; entry = list_next(entry)) {
260 hp = (struct hostportres *)entry->data;
261 for (res = hp->addrinfo; res; res = res->ai_next)
262 if (hp->prefixlen == 255) {
263 if ((a4 && res->ai_family == AF_INET &&
264 !memcmp(a4, &((struct sockaddr_in *)res->ai_addr)->sin_addr, 4) &&
265 (!checkport || ((struct sockaddr_in *)res->ai_addr)->sin_port ==
266 ((struct sockaddr_in *)addr)->sin_port)) ||
267 (sa6 && res->ai_family == AF_INET6 &&
268 !memcmp(&sa6->sin6_addr,
269 &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr, 16) &&
270 (!checkport || ((struct sockaddr_in6 *)res->ai_addr)->sin6_port ==
271 ((struct sockaddr_in6 *)addr)->sin6_port)))
274 if ((a4 && res->ai_family == AF_INET &&
275 prefixmatch(a4, &((struct sockaddr_in *)res->ai_addr)->sin_addr, hp->prefixlen)) ||
276 (sa6 && res->ai_family == AF_INET6 &&
277 prefixmatch(&sa6->sin6_addr, &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr, hp->prefixlen)))
284 int connecttcphostlist(struct list *hostports, struct addrinfo *src) {
286 struct list_node *entry;
287 struct hostportres *hp = NULL;
289 for (entry = list_first(hostports); entry; entry = list_next(entry)) {
290 hp = (struct hostportres *)entry->data;
291 debug(DBG_WARN, "connecttcphostlist: trying to open TCP connection to %s port %s", hp->host, hp->port);
292 if ((s = connecttcp(hp->addrinfo, src, list_count(hostports) > 1 ? 5 : 30)) >= 0) {
293 debug(DBG_WARN, "connecttcphostlist: TCP connection to %s port %s up", hp->host, hp->port);
297 debug(DBG_ERR, "connecttcphostlist: failed");
301 /* Local Variables: */
302 /* c-file-style: "stroustrup" */