1 /* vi: set sw=4 ts=4: */
5 * Connect to host at port using address resolution from getaddrinfo
7 * Licensed under GPLv2, see file LICENSE in this tarball for details.
10 #include <netinet/in.h>
15 void FAST_FUNC setsockopt_reuseaddr(int fd)
17 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_1, sizeof(const_int_1));
19 int FAST_FUNC setsockopt_broadcast(int fd)
21 return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
23 int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
27 strncpy_IFNAMSIZ(ifr.ifr_name, iface);
28 /* NB: passing (iface, strlen(iface) + 1) does not work!
29 * (maybe it works on _some_ kernels, but not on 2.6.26)
30 * Actually, ifr_name is at offset 0, and in practice
31 * just giving char[IFNAMSIZ] instead of struct ifreq works too.
32 * But just in case it's not true on some obscure arch... */
33 r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
35 bb_perror_msg("can't bind to interface %s", iface);
39 len_and_sockaddr* FAST_FUNC get_sock_lsa(int fd)
42 len_and_sockaddr *lsa_ptr;
44 lsa.len = LSA_SIZEOF_SA;
45 if (getsockname(fd, &lsa.u.sa, &lsa.len) != 0)
48 lsa_ptr = xzalloc(LSA_LEN_SIZE + lsa.len);
49 if (lsa.len > LSA_SIZEOF_SA) { /* rarely (if ever) happens */
50 lsa_ptr->len = lsa.len;
51 getsockname(fd, &lsa_ptr->u.sa, &lsa_ptr->len);
53 memcpy(lsa_ptr, &lsa, LSA_LEN_SIZE + lsa.len);
58 void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
60 if (connect(s, s_addr, addrlen) < 0) {
61 if (ENABLE_FEATURE_CLEAN_UP)
63 if (s_addr->sa_family == AF_INET)
64 bb_perror_msg_and_die("%s (%s)",
65 "cannot connect to remote host",
66 inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
67 bb_perror_msg_and_die("cannot connect to remote host");
71 /* Return port number for a service.
72 * If "port" is a number use it as the port.
73 * If "port" is a name it is looked up in /etc/services,
74 * if it isnt found return default_port
76 unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
78 unsigned port_nr = default_port;
82 /* Since this is a lib function, we're not allowed to reset errno to 0.
83 * Doing so could break an app that is deferring checking of errno. */
85 port_nr = bb_strtou(port, NULL, 10);
86 if (errno || port_nr > 65535) {
87 struct servent *tserv = getservbyname(port, protocol);
88 port_nr = default_port;
90 port_nr = ntohs(tserv->s_port);
94 return (uint16_t)port_nr;
98 /* "Old" networking API - only IPv4 */
101 void FAST_FUNC bb_lookup_host(struct sockaddr_in *s_in, const char *host)
105 memset(s_in, 0, sizeof(struct sockaddr_in));
106 s_in->sin_family = AF_INET;
107 he = xgethostbyname(host);
108 memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
112 int FAST_FUNC xconnect_tcp_v4(struct sockaddr_in *s_addr)
114 int s = xsocket(AF_INET, SOCK_STREAM, 0);
115 xconnect(s, (struct sockaddr*) s_addr, sizeof(*s_addr));
120 /* "New" networking API */
123 int FAST_FUNC get_nport(const struct sockaddr *sa)
125 #if ENABLE_FEATURE_IPV6
126 if (sa->sa_family == AF_INET6) {
127 return ((struct sockaddr_in6*)sa)->sin6_port;
130 if (sa->sa_family == AF_INET) {
131 return ((struct sockaddr_in*)sa)->sin_port;
133 /* What? UNIX socket? IPX?? :) */
137 void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port)
139 #if ENABLE_FEATURE_IPV6
140 if (lsa->u.sa.sa_family == AF_INET6) {
141 lsa->u.sin6.sin6_port = port;
145 if (lsa->u.sa.sa_family == AF_INET) {
146 lsa->u.sin.sin_port = port;
149 /* What? UNIX socket? IPX?? :) */
152 /* We hijack this constant to mean something else */
153 /* It doesn't hurt because we will remove this bit anyway */
154 #define DIE_ON_ERROR AI_CANONNAME
156 /* host: "1.2.3.4[:port]", "www.google.com[:port]"
157 * port: if neither of above specifies port # */
158 static len_and_sockaddr* str2sockaddr(
159 const char *host, int port,
160 IF_FEATURE_IPV6(sa_family_t af,)
165 struct addrinfo *result = NULL;
166 struct addrinfo *used_res;
167 const char *org_host = host; /* only for error msg */
169 struct addrinfo hint;
171 if (ENABLE_FEATURE_UNIX_LOCAL && strncmp(host, "local:", 6) == 0) {
172 struct sockaddr_un *sun;
174 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_un));
175 r->len = sizeof(struct sockaddr_un);
176 r->u.sa.sa_family = AF_UNIX;
177 sun = (struct sockaddr_un *)&r->u.sa;
178 safe_strncpy(sun->sun_path, host + 6, sizeof(sun->sun_path));
184 /* Ugly parsing of host:addr */
185 if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
186 /* Even uglier parsing of [xx]:nn */
188 cp = strchr(host, ']');
189 if (!cp || (cp[1] != ':' && cp[1] != '\0')) {
190 /* Malformed: must be [xx]:nn or [xx] */
191 bb_error_msg("bad address '%s'", org_host);
192 if (ai_flags & DIE_ON_ERROR)
197 cp = strrchr(host, ':');
198 if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
199 /* There is more than one ':' (e.g. "::1") */
200 cp = NULL; /* it's not a port spec */
203 if (cp) { /* points to ":" or "]:" */
204 int sz = cp - host + 1;
206 host = safe_strncpy(alloca(sz), host, sz);
207 if (ENABLE_FEATURE_IPV6 && *cp != ':') {
209 if (*cp == '\0') /* [xx] without port */
213 port = bb_strtou(cp, NULL, 10);
214 if (errno || (unsigned)port > 0xffff) {
215 bb_error_msg("bad port spec '%s'", org_host);
216 if (ai_flags & DIE_ON_ERROR)
223 memset(&hint, 0 , sizeof(hint));
224 #if !ENABLE_FEATURE_IPV6
225 hint.ai_family = AF_INET; /* do not try to find IPv6 */
229 /* Needed. Or else we will get each address thrice (or more)
230 * for each possible socket type (tcp,udp,raw...): */
231 hint.ai_socktype = SOCK_STREAM;
232 hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
233 rc = getaddrinfo(host, NULL, &hint, &result);
235 bb_error_msg("bad address '%s'", org_host);
236 if (ai_flags & DIE_ON_ERROR)
241 #if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
243 if (used_res->ai_family == AF_INET)
245 used_res = used_res->ai_next;
252 r = xmalloc(offsetof(len_and_sockaddr, u.sa) + used_res->ai_addrlen);
253 r->len = used_res->ai_addrlen;
254 memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
255 set_nport(r, htons(port));
257 freeaddrinfo(result);
260 #if !ENABLE_FEATURE_IPV6
261 #define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
264 #if ENABLE_FEATURE_IPV6
265 len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
267 return str2sockaddr(host, port, af, 0);
270 len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
272 return str2sockaddr(host, port, af, DIE_ON_ERROR);
276 len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
278 return str2sockaddr(host, port, AF_UNSPEC, 0);
281 len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
283 return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
286 len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
288 return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
292 int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, IF_FEATURE_IPV6(int family,) int sock_type)
294 IF_NOT_FEATURE_IPV6(enum { family = AF_INET };)
295 len_and_sockaddr *lsa;
299 #if ENABLE_FEATURE_IPV6
300 if (family == AF_UNSPEC) {
301 fd = socket(AF_INET6, sock_type, 0);
309 fd = xsocket(family, sock_type, 0);
310 len = sizeof(struct sockaddr_in);
311 #if ENABLE_FEATURE_IPV6
312 if (family == AF_INET6) {
314 len = sizeof(struct sockaddr_in6);
317 lsa = xzalloc(offsetof(len_and_sockaddr, u.sa) + len);
319 lsa->u.sa.sa_family = family;
324 int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
326 return xsocket_type(lsap, IF_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
329 static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
332 len_and_sockaddr *lsa;
334 if (bindaddr && bindaddr[0]) {
335 lsa = xdotted2sockaddr(bindaddr, port);
336 /* user specified bind addr dictates family */
337 fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
339 fd = xsocket_type(&lsa, IF_FEATURE_IPV6(AF_UNSPEC,) sock_type);
340 set_nport(lsa, htons(port));
342 setsockopt_reuseaddr(fd);
343 xbind(fd, &lsa->u.sa, lsa->len);
348 int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
350 return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
353 int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
355 return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
359 int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
362 len_and_sockaddr *lsa;
364 lsa = xhost2sockaddr(peer, port);
365 fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
366 setsockopt_reuseaddr(fd);
367 xconnect(fd, &lsa->u.sa, lsa->len);
372 int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
374 int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
375 xconnect(fd, &lsa->u.sa, lsa->len);
379 /* We hijack this constant to mean something else */
380 /* It doesn't hurt because we will add this bit anyway */
381 #define IGNORE_PORT NI_NUMERICSERV
382 static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
389 if (ENABLE_FEATURE_UNIX_LOCAL && sa->sa_family == AF_UNIX) {
390 struct sockaddr_un *sun = (struct sockaddr_un *)sa;
391 return xasprintf("local:%.*s",
392 (int) sizeof(sun->sun_path),
396 salen = LSA_SIZEOF_SA;
397 #if ENABLE_FEATURE_IPV6
398 if (sa->sa_family == AF_INET)
399 salen = sizeof(struct sockaddr_in);
400 if (sa->sa_family == AF_INET6)
401 salen = sizeof(struct sockaddr_in6);
403 rc = getnameinfo(sa, salen,
405 /* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
407 /* do not resolve port# into service _name_ */
408 flags | NI_NUMERICSERV
412 if (flags & IGNORE_PORT)
413 return xstrdup(host);
414 #if ENABLE_FEATURE_IPV6
415 if (sa->sa_family == AF_INET6) {
416 if (strchr(host, ':')) /* heh, it's not a resolved hostname */
417 return xasprintf("[%s]:%s", host, serv);
418 /*return xasprintf("%s:%s", host, serv);*/
419 /* - fall through instead */
422 /* For now we don't support anything else, so it has to be INET */
423 /*if (sa->sa_family == AF_INET)*/
424 return xasprintf("%s:%s", host, serv);
425 /*return xstrdup(host);*/
428 char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
430 return sockaddr2str(sa, 0);
433 char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
435 return sockaddr2str(sa, IGNORE_PORT);
438 char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
440 return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
442 char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
444 return sockaddr2str(sa, NI_NUMERICHOST);
447 char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
449 return sockaddr2str(sa, NI_NUMERICHOST | IGNORE_PORT);