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 source tree.
10 #include <sys/socket.h> /* netinet/in.h needs it */
11 #include <netinet/in.h>
16 int FAST_FUNC setsockopt_int(int fd, int level, int optname, int optval)
18 return setsockopt(fd, level, optname, &optval, sizeof(int));
20 int FAST_FUNC setsockopt_1(int fd, int level, int optname)
22 return setsockopt_int(fd, level, optname, 1);
24 int FAST_FUNC setsockopt_SOL_SOCKET_int(int fd, int optname, int optval)
26 return setsockopt_int(fd, SOL_SOCKET, optname, optval);
28 int FAST_FUNC setsockopt_SOL_SOCKET_1(int fd, int optname)
30 return setsockopt_SOL_SOCKET_int(fd, optname, 1);
33 void FAST_FUNC setsockopt_reuseaddr(int fd)
35 setsockopt_SOL_SOCKET_1(fd, SO_REUSEADDR);
37 int FAST_FUNC setsockopt_broadcast(int fd)
39 return setsockopt_SOL_SOCKET_1(fd, SO_BROADCAST);
41 int FAST_FUNC setsockopt_keepalive(int fd)
43 return setsockopt_SOL_SOCKET_1(fd, SO_KEEPALIVE);
46 #ifdef SO_BINDTODEVICE
47 int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
51 strncpy_IFNAMSIZ(ifr.ifr_name, iface);
52 /* NB: passing (iface, strlen(iface) + 1) does not work!
53 * (maybe it works on _some_ kernels, but not on 2.6.26)
54 * Actually, ifr_name is at offset 0, and in practice
55 * just giving char[IFNAMSIZ] instead of struct ifreq works too.
56 * But just in case it's not true on some obscure arch... */
57 r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
59 bb_perror_msg("can't bind to interface %s", iface);
63 int FAST_FUNC setsockopt_bindtodevice(int fd UNUSED_PARAM,
64 const char *iface UNUSED_PARAM)
66 bb_error_msg("SO_BINDTODEVICE is not supported on this system");
71 static len_and_sockaddr* get_lsa(int fd, int (*get_name)(int fd, struct sockaddr *addr, socklen_t *addrlen))
74 len_and_sockaddr *lsa_ptr;
76 lsa.len = LSA_SIZEOF_SA;
77 if (get_name(fd, &lsa.u.sa, &lsa.len) != 0)
80 lsa_ptr = xzalloc(LSA_LEN_SIZE + lsa.len);
81 if (lsa.len > LSA_SIZEOF_SA) { /* rarely (if ever) happens */
82 lsa_ptr->len = lsa.len;
83 get_name(fd, &lsa_ptr->u.sa, &lsa_ptr->len);
85 memcpy(lsa_ptr, &lsa, LSA_LEN_SIZE + lsa.len);
90 len_and_sockaddr* FAST_FUNC get_sock_lsa(int fd)
92 return get_lsa(fd, getsockname);
95 len_and_sockaddr* FAST_FUNC get_peer_lsa(int fd)
97 return get_lsa(fd, getpeername);
100 void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
102 if (connect(s, s_addr, addrlen) < 0) {
103 if (ENABLE_FEATURE_CLEAN_UP)
105 if (s_addr->sa_family == AF_INET)
106 bb_perror_msg_and_die("%s (%s)",
107 "can't connect to remote host",
108 inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
109 bb_perror_msg_and_die("can't connect to remote host");
113 /* Return port number for a service.
114 * If "port" is a number use it as the port.
115 * If "port" is a name it is looked up in /etc/services,
116 * if it isnt found return default_port
118 unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
120 unsigned port_nr = default_port;
124 /* Since this is a lib function, we're not allowed to reset errno to 0.
125 * Doing so could break an app that is deferring checking of errno. */
127 port_nr = bb_strtou(port, NULL, 10);
128 if (errno || port_nr > 65535) {
129 struct servent *tserv = getservbyname(port, protocol);
130 port_nr = default_port;
132 port_nr = ntohs(tserv->s_port);
136 return (uint16_t)port_nr;
140 /* "New" networking API */
143 int FAST_FUNC get_nport(const struct sockaddr *sa)
145 #if ENABLE_FEATURE_IPV6
146 if (sa->sa_family == AF_INET6) {
147 return ((struct sockaddr_in6*)sa)->sin6_port;
150 if (sa->sa_family == AF_INET) {
151 return ((struct sockaddr_in*)sa)->sin_port;
153 /* What? UNIX socket? IPX?? :) */
157 void FAST_FUNC set_nport(struct sockaddr *sa, unsigned port)
159 #if ENABLE_FEATURE_IPV6
160 if (sa->sa_family == AF_INET6) {
161 struct sockaddr_in6 *sin6 = (void*) sa;
162 sin6->sin6_port = port;
166 if (sa->sa_family == AF_INET) {
167 struct sockaddr_in *sin = (void*) sa;
168 sin->sin_port = port;
171 /* What? UNIX socket? IPX?? :) */
174 /* We hijack this constant to mean something else */
175 /* It doesn't hurt because we will remove this bit anyway */
176 #define DIE_ON_ERROR AI_CANONNAME
178 /* host: "1.2.3.4[:port]", "www.google.com[:port]"
179 * port: if neither of above specifies port # */
180 static len_and_sockaddr* str2sockaddr(
181 const char *host, int port,
182 IF_FEATURE_IPV6(sa_family_t af,)
185 IF_NOT_FEATURE_IPV6(sa_family_t af = AF_INET;)
188 struct addrinfo *result = NULL;
189 struct addrinfo *used_res;
190 const char *org_host = host; /* only for error msg */
192 struct addrinfo hint;
194 if (ENABLE_FEATURE_UNIX_LOCAL && is_prefixed_with(host, "local:")) {
195 struct sockaddr_un *sun;
197 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_un));
198 r->len = sizeof(struct sockaddr_un);
199 r->u.sa.sa_family = AF_UNIX;
200 sun = (struct sockaddr_un *)&r->u.sa;
201 safe_strncpy(sun->sun_path, host + 6, sizeof(sun->sun_path));
207 /* Ugly parsing of host:addr */
208 if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
209 /* Even uglier parsing of [xx]:nn */
211 cp = strchr(host, ']');
212 if (!cp || (cp[1] != ':' && cp[1] != '\0')) {
213 /* Malformed: must be [xx]:nn or [xx] */
214 bb_error_msg("bad address '%s'", org_host);
215 if (ai_flags & DIE_ON_ERROR)
220 cp = strrchr(host, ':');
221 if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
222 /* There is more than one ':' (e.g. "::1") */
223 cp = NULL; /* it's not a port spec */
226 if (cp) { /* points to ":" or "]:" */
227 int sz = cp - host + 1;
229 host = safe_strncpy(alloca(sz), host, sz);
230 if (ENABLE_FEATURE_IPV6 && *cp != ':') {
232 if (*cp == '\0') /* [xx] without port */
236 port = bb_strtou(cp, NULL, 10);
237 if (errno || (unsigned)port > 0xffff) {
238 bb_error_msg("bad port spec '%s'", org_host);
239 if (ai_flags & DIE_ON_ERROR)
246 /* Next two if blocks allow to skip getaddrinfo()
247 * in case host name is a numeric IP(v6) address.
248 * getaddrinfo() initializes DNS resolution machinery,
249 * scans network config and such - tens of syscalls.
251 /* If we were not asked specifically for IPv6,
252 * check whether this is a numeric IPv4 */
253 IF_FEATURE_IPV6(if(af != AF_INET6)) {
255 if (inet_aton(host, &in4) != 0) {
256 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in));
257 r->len = sizeof(struct sockaddr_in);
258 r->u.sa.sa_family = AF_INET;
259 r->u.sin.sin_addr = in4;
263 #if ENABLE_FEATURE_IPV6
264 /* If we were not asked specifically for IPv4,
265 * check whether this is a numeric IPv6 */
268 if (inet_pton(AF_INET6, host, &in6) > 0) {
269 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in6));
270 r->len = sizeof(struct sockaddr_in6);
271 r->u.sa.sa_family = AF_INET6;
272 r->u.sin6.sin6_addr = in6;
278 memset(&hint, 0 , sizeof(hint));
280 /* Need SOCK_STREAM, or else we get each address thrice (or more)
281 * for each possible socket type (tcp,udp,raw...): */
282 hint.ai_socktype = SOCK_STREAM;
283 hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
284 rc = getaddrinfo(host, NULL, &hint, &result);
286 bb_error_msg("bad address '%s'", org_host);
287 if (ai_flags & DIE_ON_ERROR)
292 #if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
294 if (used_res->ai_family == AF_INET)
296 used_res = used_res->ai_next;
303 r = xmalloc(LSA_LEN_SIZE + used_res->ai_addrlen);
304 r->len = used_res->ai_addrlen;
305 memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
308 set_nport(&r->u.sa, htons(port));
311 freeaddrinfo(result);
314 #if !ENABLE_FEATURE_IPV6
315 #define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
318 #if ENABLE_FEATURE_IPV6
319 len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
321 return str2sockaddr(host, port, af, 0);
324 len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
326 return str2sockaddr(host, port, af, DIE_ON_ERROR);
330 len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
332 return str2sockaddr(host, port, AF_UNSPEC, 0);
335 len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
337 return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
340 len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
342 return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
345 int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, int family, int sock_type)
347 len_and_sockaddr *lsa;
351 if (family == AF_UNSPEC) {
352 #if ENABLE_FEATURE_IPV6
353 fd = socket(AF_INET6, sock_type, 0);
362 fd = xsocket(family, sock_type, 0);
364 len = sizeof(struct sockaddr_in);
365 if (family == AF_UNIX)
366 len = sizeof(struct sockaddr_un);
367 #if ENABLE_FEATURE_IPV6
368 if (family == AF_INET6) {
370 len = sizeof(struct sockaddr_in6);
373 lsa = xzalloc(LSA_LEN_SIZE + len);
375 lsa->u.sa.sa_family = family;
380 int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
382 return xsocket_type(lsap, AF_UNSPEC, SOCK_STREAM);
385 static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
388 len_and_sockaddr *lsa;
390 if (bindaddr && bindaddr[0]) {
391 lsa = xdotted2sockaddr(bindaddr, port);
392 /* user specified bind addr dictates family */
393 fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
395 fd = xsocket_type(&lsa, AF_UNSPEC, sock_type);
396 set_nport(&lsa->u.sa, htons(port));
398 setsockopt_reuseaddr(fd);
399 xbind(fd, &lsa->u.sa, lsa->len);
404 int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
406 return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
409 int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
411 return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
415 int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
418 len_and_sockaddr *lsa;
420 lsa = xhost2sockaddr(peer, port);
421 fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
422 setsockopt_reuseaddr(fd);
423 xconnect(fd, &lsa->u.sa, lsa->len);
428 int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
430 int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
431 xconnect(fd, &lsa->u.sa, lsa->len);
435 /* We hijack this constant to mean something else */
436 /* It doesn't hurt because we will add this bit anyway */
437 #define IGNORE_PORT NI_NUMERICSERV
438 static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
445 if (ENABLE_FEATURE_UNIX_LOCAL && sa->sa_family == AF_UNIX) {
446 struct sockaddr_un *sun = (struct sockaddr_un *)sa;
447 return xasprintf("local:%.*s",
448 (int) sizeof(sun->sun_path),
452 salen = LSA_SIZEOF_SA;
453 #if ENABLE_FEATURE_IPV6
454 if (sa->sa_family == AF_INET)
455 salen = sizeof(struct sockaddr_in);
456 if (sa->sa_family == AF_INET6)
457 salen = sizeof(struct sockaddr_in6);
459 rc = getnameinfo(sa, salen,
461 /* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
463 /* do not resolve port# into service _name_ */
464 flags | NI_NUMERICSERV
468 if (flags & IGNORE_PORT)
469 return xstrdup(host);
470 #if ENABLE_FEATURE_IPV6
471 if (sa->sa_family == AF_INET6) {
472 if (strchr(host, ':')) /* heh, it's not a resolved hostname */
473 return xasprintf("[%s]:%s", host, serv);
474 /*return xasprintf("%s:%s", host, serv);*/
475 /* - fall through instead */
478 /* For now we don't support anything else, so it has to be INET */
479 /*if (sa->sa_family == AF_INET)*/
480 return xasprintf("%s:%s", host, serv);
481 /*return xstrdup(host);*/
484 char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
486 return sockaddr2str(sa, 0);
489 char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
491 return sockaddr2str(sa, IGNORE_PORT);
494 char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
496 return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
498 #ifndef NI_NUMERICSCOPE
499 # define NI_NUMERICSCOPE 0
501 char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
503 return sockaddr2str(sa, NI_NUMERICHOST | NI_NUMERICSCOPE);
506 char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
508 return sockaddr2str(sa, NI_NUMERICHOST | NI_NUMERICSCOPE | IGNORE_PORT);