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>
14 #if ENABLE_IFPLUGD || ENABLE_FEATURE_MDEV_DAEMON || ENABLE_UEVENT
15 # include <linux/netlink.h>
19 int FAST_FUNC setsockopt_int(int fd, int level, int optname, int optval)
21 return setsockopt(fd, level, optname, &optval, sizeof(int));
23 int FAST_FUNC setsockopt_1(int fd, int level, int optname)
25 return setsockopt_int(fd, level, optname, 1);
27 int FAST_FUNC setsockopt_SOL_SOCKET_int(int fd, int optname, int optval)
29 return setsockopt_int(fd, SOL_SOCKET, optname, optval);
31 int FAST_FUNC setsockopt_SOL_SOCKET_1(int fd, int optname)
33 return setsockopt_SOL_SOCKET_int(fd, optname, 1);
36 void FAST_FUNC setsockopt_reuseaddr(int fd)
38 setsockopt_SOL_SOCKET_1(fd, SO_REUSEADDR);
40 int FAST_FUNC setsockopt_broadcast(int fd)
42 return setsockopt_SOL_SOCKET_1(fd, SO_BROADCAST);
44 int FAST_FUNC setsockopt_keepalive(int fd)
46 return setsockopt_SOL_SOCKET_1(fd, SO_KEEPALIVE);
49 #ifdef SO_BINDTODEVICE
50 int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
54 strncpy_IFNAMSIZ(ifr.ifr_name, iface);
55 /* NB: passing (iface, strlen(iface) + 1) does not work!
56 * (maybe it works on _some_ kernels, but not on 2.6.26)
57 * Actually, ifr_name is at offset 0, and in practice
58 * just giving char[IFNAMSIZ] instead of struct ifreq works too.
59 * But just in case it's not true on some obscure arch... */
60 r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
62 bb_perror_msg("can't bind to interface %s", iface);
66 int FAST_FUNC setsockopt_bindtodevice(int fd UNUSED_PARAM,
67 const char *iface UNUSED_PARAM)
69 bb_simple_error_msg("SO_BINDTODEVICE is not supported on this system");
74 static len_and_sockaddr* get_lsa(int fd, int (*get_name)(int fd, struct sockaddr *addr, socklen_t *addrlen))
77 len_and_sockaddr *lsa_ptr;
79 lsa.len = LSA_SIZEOF_SA;
80 if (get_name(fd, &lsa.u.sa, &lsa.len) != 0)
83 lsa_ptr = xzalloc(LSA_LEN_SIZE + lsa.len);
84 if (lsa.len > LSA_SIZEOF_SA) { /* rarely (if ever) happens */
85 lsa_ptr->len = lsa.len;
86 get_name(fd, &lsa_ptr->u.sa, &lsa_ptr->len);
88 memcpy(lsa_ptr, &lsa, LSA_LEN_SIZE + lsa.len);
93 len_and_sockaddr* FAST_FUNC get_sock_lsa(int fd)
95 return get_lsa(fd, getsockname);
98 len_and_sockaddr* FAST_FUNC get_peer_lsa(int fd)
100 return get_lsa(fd, getpeername);
103 void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
105 if (connect(s, s_addr, addrlen) < 0) {
106 if (ENABLE_FEATURE_CLEAN_UP)
108 if (s_addr->sa_family == AF_INET)
109 bb_perror_msg_and_die("%s (%s)",
110 "can't connect to remote host",
111 inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
112 bb_simple_perror_msg_and_die("can't connect to remote host");
116 /* Return port number for a service.
117 * If "port" is a number use it as the port.
118 * If "port" is a name it is looked up in /etc/services,
119 * if it isnt found return default_port
121 unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
123 unsigned port_nr = default_port;
127 /* Since this is a lib function, we're not allowed to reset errno to 0.
128 * Doing so could break an app that is deferring checking of errno. */
130 port_nr = bb_strtou(port, NULL, 10);
131 if (errno || port_nr > 65535) {
132 struct servent *tserv = getservbyname(port, protocol);
133 port_nr = default_port;
135 port_nr = ntohs(tserv->s_port);
136 //FIXME: else: port string was garbage, but we don't report that???
140 return (uint16_t)port_nr;
144 /* "New" networking API */
147 int FAST_FUNC get_nport(const struct sockaddr *sa)
149 #if ENABLE_FEATURE_IPV6
150 if (sa->sa_family == AF_INET6) {
151 return ((struct sockaddr_in6*)sa)->sin6_port;
154 if (sa->sa_family == AF_INET) {
155 return ((struct sockaddr_in*)sa)->sin_port;
157 /* What? UNIX socket? IPX?? :) */
161 void FAST_FUNC set_nport(struct sockaddr *sa, unsigned port)
163 #if ENABLE_FEATURE_IPV6
164 if (sa->sa_family == AF_INET6) {
165 struct sockaddr_in6 *sin6 = (void*) sa;
166 sin6->sin6_port = port;
170 if (sa->sa_family == AF_INET) {
171 struct sockaddr_in *sin = (void*) sa;
172 sin->sin_port = port;
175 /* What? UNIX socket? IPX?? :) */
178 /* We hijack this constant to mean something else */
179 /* It doesn't hurt because we will remove this bit anyway */
180 #define DIE_ON_ERROR AI_CANONNAME
182 /* host: "1.2.3.4[:port]", "www.google.com[:port]"
183 * port: if neither of above specifies port # */
184 static len_and_sockaddr* str2sockaddr(
185 const char *host, int port,
186 IF_FEATURE_IPV6(sa_family_t af,)
189 IF_NOT_FEATURE_IPV6(sa_family_t af = AF_INET;)
192 struct addrinfo *result = NULL;
193 struct addrinfo *used_res;
194 const char *org_host = host; /* only for error msg */
196 struct addrinfo hint;
198 if (ENABLE_FEATURE_UNIX_LOCAL && is_prefixed_with(host, "local:")) {
199 struct sockaddr_un *sun;
201 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_un));
202 r->len = sizeof(struct sockaddr_un);
203 r->u.sa.sa_family = AF_UNIX;
204 sun = (struct sockaddr_un *)&r->u.sa;
205 safe_strncpy(sun->sun_path, host + 6, sizeof(sun->sun_path));
211 /* Ugly parsing of host:addr */
212 if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
213 /* Even uglier parsing of [xx]:nn */
215 cp = strchr(host, ']');
216 if (!cp || (cp[1] != ':' && cp[1] != '\0')) {
217 /* Malformed: must be [xx]:nn or [xx] */
218 bb_error_msg("bad address '%s'", org_host);
219 if (ai_flags & DIE_ON_ERROR)
224 cp = strrchr(host, ':');
225 if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
226 /* There is more than one ':' (e.g. "::1") */
227 cp = NULL; /* it's not a port spec */
230 if (cp) { /* points to ":" or "]:" */
231 int sz = cp - host + 1;
233 host = safe_strncpy(alloca(sz), host, sz);
234 if (ENABLE_FEATURE_IPV6 && *cp != ':') {
236 if (*cp == '\0') /* [xx] without port */
240 port = bb_strtou(cp, NULL, 10);
241 if (errno || (unsigned)port > 0xffff) {
242 bb_error_msg("bad port spec '%s'", org_host);
243 if (ai_flags & DIE_ON_ERROR)
250 /* Next two if blocks allow to skip getaddrinfo()
251 * in case host name is a numeric IP(v6) address.
252 * getaddrinfo() initializes DNS resolution machinery,
253 * scans network config and such - tens of syscalls.
255 /* If we were not asked specifically for IPv6,
256 * check whether this is a numeric IPv4 */
257 IF_FEATURE_IPV6(if(af != AF_INET6)) {
259 if (inet_aton(host, &in4) != 0) {
260 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in));
261 r->len = sizeof(struct sockaddr_in);
262 r->u.sa.sa_family = AF_INET;
263 r->u.sin.sin_addr = in4;
267 #if ENABLE_FEATURE_IPV6
268 /* If we were not asked specifically for IPv4,
269 * check whether this is a numeric IPv6 */
272 if (inet_pton(AF_INET6, host, &in6) > 0) {
273 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in6));
274 r->len = sizeof(struct sockaddr_in6);
275 r->u.sa.sa_family = AF_INET6;
276 r->u.sin6.sin6_addr = in6;
282 memset(&hint, 0 , sizeof(hint));
284 /* Need SOCK_STREAM, or else we get each address thrice (or more)
285 * for each possible socket type (tcp,udp,raw...): */
286 hint.ai_socktype = SOCK_STREAM;
287 hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
288 rc = getaddrinfo(host, NULL, &hint, &result);
290 bb_error_msg("bad address '%s'", org_host);
291 if (ai_flags & DIE_ON_ERROR)
296 #if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
298 if (used_res->ai_family == AF_INET)
300 used_res = used_res->ai_next;
307 r = xmalloc(LSA_LEN_SIZE + used_res->ai_addrlen);
308 r->len = used_res->ai_addrlen;
309 memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
312 set_nport(&r->u.sa, htons(port));
315 freeaddrinfo(result);
318 #if !ENABLE_FEATURE_IPV6
319 #define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
322 #if ENABLE_FEATURE_IPV6
323 len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
325 return str2sockaddr(host, port, af, 0);
328 len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
330 return str2sockaddr(host, port, af, DIE_ON_ERROR);
334 len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
336 return str2sockaddr(host, port, AF_UNSPEC, 0);
339 len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
341 return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
344 len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
346 return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
349 int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, int family, int sock_type)
351 len_and_sockaddr *lsa;
355 if (family == AF_UNSPEC) {
356 #if ENABLE_FEATURE_IPV6
357 fd = socket(AF_INET6, sock_type, 0);
366 fd = xsocket(family, sock_type, 0);
368 len = sizeof(struct sockaddr_in);
369 if (family == AF_UNIX)
370 len = sizeof(struct sockaddr_un);
371 #if ENABLE_FEATURE_IPV6
372 if (family == AF_INET6) {
374 len = sizeof(struct sockaddr_in6);
377 lsa = xzalloc(LSA_LEN_SIZE + len);
379 lsa->u.sa.sa_family = family;
384 int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
386 return xsocket_type(lsap, AF_UNSPEC, SOCK_STREAM);
389 static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
392 len_and_sockaddr *lsa;
394 if (bindaddr && bindaddr[0]) {
395 lsa = xdotted2sockaddr(bindaddr, port);
396 /* user specified bind addr dictates family */
397 fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
399 fd = xsocket_type(&lsa, AF_UNSPEC, sock_type);
400 set_nport(&lsa->u.sa, htons(port));
402 setsockopt_reuseaddr(fd);
403 xbind(fd, &lsa->u.sa, lsa->len);
408 int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
410 return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
413 int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
415 return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
419 #if ENABLE_IFPLUGD || ENABLE_FEATURE_MDEV_DAEMON || ENABLE_UEVENT
420 int FAST_FUNC create_and_bind_to_netlink(int proto, int grp, unsigned rcvbuf)
422 struct sockaddr_nl sa;
425 memset(&sa, 0, sizeof(sa));
426 sa.nl_family = AF_NETLINK;
427 sa.nl_pid = getpid();
429 fd = xsocket(AF_NETLINK, SOCK_DGRAM, proto);
430 xbind(fd, (struct sockaddr *) &sa, sizeof(sa));
431 close_on_exec_on(fd);
434 // SO_RCVBUFFORCE (root only) can go above net.core.rmem_max sysctl
435 setsockopt_SOL_SOCKET_int(fd, SO_RCVBUF, rcvbuf);
436 setsockopt_SOL_SOCKET_int(fd, SO_RCVBUFFORCE, rcvbuf);
440 socklen_t zl = sizeof(z);
441 getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &z, &zl);
442 bb_error_msg("SO_RCVBUF:%d", z);
451 int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
454 len_and_sockaddr *lsa;
456 lsa = xhost2sockaddr(peer, port);
457 fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
458 setsockopt_reuseaddr(fd);
459 xconnect(fd, &lsa->u.sa, lsa->len);
464 int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
466 int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
467 xconnect(fd, &lsa->u.sa, lsa->len);
471 /* We hijack this constant to mean something else */
472 /* It doesn't hurt because we will add this bit anyway */
473 #define IGNORE_PORT NI_NUMERICSERV
474 static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
481 if (ENABLE_FEATURE_UNIX_LOCAL && sa->sa_family == AF_UNIX) {
482 struct sockaddr_un *sun = (struct sockaddr_un *)sa;
483 return xasprintf("local:%.*s",
484 (int) sizeof(sun->sun_path),
488 salen = LSA_SIZEOF_SA;
489 #if ENABLE_FEATURE_IPV6
490 if (sa->sa_family == AF_INET)
491 salen = sizeof(struct sockaddr_in);
492 if (sa->sa_family == AF_INET6)
493 salen = sizeof(struct sockaddr_in6);
495 rc = getnameinfo(sa, salen,
497 /* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
499 /* do not resolve port# into service _name_ */
500 flags | NI_NUMERICSERV
504 if (flags & IGNORE_PORT)
505 return xstrdup(host);
506 #if ENABLE_FEATURE_IPV6
507 if (sa->sa_family == AF_INET6) {
508 if (strchr(host, ':')) /* heh, it's not a resolved hostname */
509 return xasprintf("[%s]:%s", host, serv);
510 /*return xasprintf("%s:%s", host, serv);*/
511 /* - fall through instead */
514 /* For now we don't support anything else, so it has to be INET */
515 /*if (sa->sa_family == AF_INET)*/
516 return xasprintf("%s:%s", host, serv);
517 /*return xstrdup(host);*/
520 char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
522 return sockaddr2str(sa, 0);
525 char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
527 return sockaddr2str(sa, IGNORE_PORT);
530 char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
532 return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
534 #ifndef NI_NUMERICSCOPE
535 # define NI_NUMERICSCOPE 0
537 char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
539 return sockaddr2str(sa, NI_NUMERICHOST | NI_NUMERICSCOPE);
542 char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
544 return sockaddr2str(sa, NI_NUMERICHOST | NI_NUMERICSCOPE | IGNORE_PORT);