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 <sys/socket.h> /* netinet/in.h needs it */
11 #include <netinet/in.h>
16 void FAST_FUNC setsockopt_reuseaddr(int fd)
18 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_1, sizeof(const_int_1));
20 int FAST_FUNC setsockopt_broadcast(int fd)
22 return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
24 int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
28 strncpy_IFNAMSIZ(ifr.ifr_name, iface);
29 /* NB: passing (iface, strlen(iface) + 1) does not work!
30 * (maybe it works on _some_ kernels, but not on 2.6.26)
31 * Actually, ifr_name is at offset 0, and in practice
32 * just giving char[IFNAMSIZ] instead of struct ifreq works too.
33 * But just in case it's not true on some obscure arch... */
34 r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
36 bb_perror_msg("can't bind to interface %s", iface);
40 len_and_sockaddr* FAST_FUNC get_sock_lsa(int fd)
43 len_and_sockaddr *lsa_ptr;
45 lsa.len = LSA_SIZEOF_SA;
46 if (getsockname(fd, &lsa.u.sa, &lsa.len) != 0)
49 lsa_ptr = xzalloc(LSA_LEN_SIZE + lsa.len);
50 if (lsa.len > LSA_SIZEOF_SA) { /* rarely (if ever) happens */
51 lsa_ptr->len = lsa.len;
52 getsockname(fd, &lsa_ptr->u.sa, &lsa_ptr->len);
54 memcpy(lsa_ptr, &lsa, LSA_LEN_SIZE + lsa.len);
59 void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
61 if (connect(s, s_addr, addrlen) < 0) {
62 if (ENABLE_FEATURE_CLEAN_UP)
64 if (s_addr->sa_family == AF_INET)
65 bb_perror_msg_and_die("%s (%s)",
66 "cannot connect to remote host",
67 inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
68 bb_perror_msg_and_die("cannot connect to remote host");
72 /* Return port number for a service.
73 * If "port" is a number use it as the port.
74 * If "port" is a name it is looked up in /etc/services,
75 * if it isnt found return default_port
77 unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
79 unsigned port_nr = default_port;
83 /* Since this is a lib function, we're not allowed to reset errno to 0.
84 * Doing so could break an app that is deferring checking of errno. */
86 port_nr = bb_strtou(port, NULL, 10);
87 if (errno || port_nr > 65535) {
88 struct servent *tserv = getservbyname(port, protocol);
89 port_nr = default_port;
91 port_nr = ntohs(tserv->s_port);
95 return (uint16_t)port_nr;
99 /* "Old" networking API - only IPv4 */
102 void FAST_FUNC bb_lookup_host(struct sockaddr_in *s_in, const char *host)
106 memset(s_in, 0, sizeof(struct sockaddr_in));
107 s_in->sin_family = AF_INET;
108 he = xgethostbyname(host);
109 memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
113 int FAST_FUNC xconnect_tcp_v4(struct sockaddr_in *s_addr)
115 int s = xsocket(AF_INET, SOCK_STREAM, 0);
116 xconnect(s, (struct sockaddr*) s_addr, sizeof(*s_addr));
121 /* "New" networking API */
124 int FAST_FUNC get_nport(const struct sockaddr *sa)
126 #if ENABLE_FEATURE_IPV6
127 if (sa->sa_family == AF_INET6) {
128 return ((struct sockaddr_in6*)sa)->sin6_port;
131 if (sa->sa_family == AF_INET) {
132 return ((struct sockaddr_in*)sa)->sin_port;
134 /* What? UNIX socket? IPX?? :) */
138 void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port)
140 #if ENABLE_FEATURE_IPV6
141 if (lsa->u.sa.sa_family == AF_INET6) {
142 lsa->u.sin6.sin6_port = port;
146 if (lsa->u.sa.sa_family == AF_INET) {
147 lsa->u.sin.sin_port = port;
150 /* What? UNIX socket? IPX?? :) */
153 /* We hijack this constant to mean something else */
154 /* It doesn't hurt because we will remove this bit anyway */
155 #define DIE_ON_ERROR AI_CANONNAME
157 /* host: "1.2.3.4[:port]", "www.google.com[:port]"
158 * port: if neither of above specifies port # */
159 static len_and_sockaddr* str2sockaddr(
160 const char *host, int port,
161 IF_FEATURE_IPV6(sa_family_t af,)
166 struct addrinfo *result = NULL;
167 struct addrinfo *used_res;
168 const char *org_host = host; /* only for error msg */
170 struct addrinfo hint;
172 if (ENABLE_FEATURE_UNIX_LOCAL && strncmp(host, "local:", 6) == 0) {
173 struct sockaddr_un *sun;
175 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_un));
176 r->len = sizeof(struct sockaddr_un);
177 r->u.sa.sa_family = AF_UNIX;
178 sun = (struct sockaddr_un *)&r->u.sa;
179 safe_strncpy(sun->sun_path, host + 6, sizeof(sun->sun_path));
185 /* Ugly parsing of host:addr */
186 if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
187 /* Even uglier parsing of [xx]:nn */
189 cp = strchr(host, ']');
190 if (!cp || (cp[1] != ':' && cp[1] != '\0')) {
191 /* Malformed: must be [xx]:nn or [xx] */
192 bb_error_msg("bad address '%s'", org_host);
193 if (ai_flags & DIE_ON_ERROR)
198 cp = strrchr(host, ':');
199 if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
200 /* There is more than one ':' (e.g. "::1") */
201 cp = NULL; /* it's not a port spec */
204 if (cp) { /* points to ":" or "]:" */
205 int sz = cp - host + 1;
207 host = safe_strncpy(alloca(sz), host, sz);
208 if (ENABLE_FEATURE_IPV6 && *cp != ':') {
210 if (*cp == '\0') /* [xx] without port */
214 port = bb_strtou(cp, NULL, 10);
215 if (errno || (unsigned)port > 0xffff) {
216 bb_error_msg("bad port spec '%s'", org_host);
217 if (ai_flags & DIE_ON_ERROR)
224 memset(&hint, 0 , sizeof(hint));
225 #if !ENABLE_FEATURE_IPV6
226 hint.ai_family = AF_INET; /* do not try to find IPv6 */
230 /* Needed. Or else we will get each address thrice (or more)
231 * for each possible socket type (tcp,udp,raw...): */
232 hint.ai_socktype = SOCK_STREAM;
233 hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
234 rc = getaddrinfo(host, NULL, &hint, &result);
236 bb_error_msg("bad address '%s'", org_host);
237 if (ai_flags & DIE_ON_ERROR)
242 #if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
244 if (used_res->ai_family == AF_INET)
246 used_res = used_res->ai_next;
253 r = xmalloc(offsetof(len_and_sockaddr, u.sa) + used_res->ai_addrlen);
254 r->len = used_res->ai_addrlen;
255 memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
256 set_nport(r, htons(port));
258 freeaddrinfo(result);
261 #if !ENABLE_FEATURE_IPV6
262 #define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
265 #if ENABLE_FEATURE_IPV6
266 len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
268 return str2sockaddr(host, port, af, 0);
271 len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
273 return str2sockaddr(host, port, af, DIE_ON_ERROR);
277 len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
279 return str2sockaddr(host, port, AF_UNSPEC, 0);
282 len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
284 return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
287 len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
289 return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
293 int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, IF_FEATURE_IPV6(int family,) int sock_type)
295 IF_NOT_FEATURE_IPV6(enum { family = AF_INET };)
296 len_and_sockaddr *lsa;
300 #if ENABLE_FEATURE_IPV6
301 if (family == AF_UNSPEC) {
302 fd = socket(AF_INET6, sock_type, 0);
310 fd = xsocket(family, sock_type, 0);
311 len = sizeof(struct sockaddr_in);
312 #if ENABLE_FEATURE_IPV6
313 if (family == AF_INET6) {
315 len = sizeof(struct sockaddr_in6);
318 lsa = xzalloc(offsetof(len_and_sockaddr, u.sa) + len);
320 lsa->u.sa.sa_family = family;
325 int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
327 return xsocket_type(lsap, IF_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
330 static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
333 len_and_sockaddr *lsa;
335 if (bindaddr && bindaddr[0]) {
336 lsa = xdotted2sockaddr(bindaddr, port);
337 /* user specified bind addr dictates family */
338 fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
340 fd = xsocket_type(&lsa, IF_FEATURE_IPV6(AF_UNSPEC,) sock_type);
341 set_nport(lsa, htons(port));
343 setsockopt_reuseaddr(fd);
344 xbind(fd, &lsa->u.sa, lsa->len);
349 int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
351 return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
354 int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
356 return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
360 int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
363 len_and_sockaddr *lsa;
365 lsa = xhost2sockaddr(peer, port);
366 fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
367 setsockopt_reuseaddr(fd);
368 xconnect(fd, &lsa->u.sa, lsa->len);
373 int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
375 int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
376 xconnect(fd, &lsa->u.sa, lsa->len);
380 /* We hijack this constant to mean something else */
381 /* It doesn't hurt because we will add this bit anyway */
382 #define IGNORE_PORT NI_NUMERICSERV
383 static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
390 if (ENABLE_FEATURE_UNIX_LOCAL && sa->sa_family == AF_UNIX) {
391 struct sockaddr_un *sun = (struct sockaddr_un *)sa;
392 return xasprintf("local:%.*s",
393 (int) sizeof(sun->sun_path),
397 salen = LSA_SIZEOF_SA;
398 #if ENABLE_FEATURE_IPV6
399 if (sa->sa_family == AF_INET)
400 salen = sizeof(struct sockaddr_in);
401 if (sa->sa_family == AF_INET6)
402 salen = sizeof(struct sockaddr_in6);
404 rc = getnameinfo(sa, salen,
406 /* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
408 /* do not resolve port# into service _name_ */
409 flags | NI_NUMERICSERV
413 if (flags & IGNORE_PORT)
414 return xstrdup(host);
415 #if ENABLE_FEATURE_IPV6
416 if (sa->sa_family == AF_INET6) {
417 if (strchr(host, ':')) /* heh, it's not a resolved hostname */
418 return xasprintf("[%s]:%s", host, serv);
419 /*return xasprintf("%s:%s", host, serv);*/
420 /* - fall through instead */
423 /* For now we don't support anything else, so it has to be INET */
424 /*if (sa->sa_family == AF_INET)*/
425 return xasprintf("%s:%s", host, serv);
426 /*return xstrdup(host);*/
429 char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
431 return sockaddr2str(sa, 0);
434 char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
436 return sockaddr2str(sa, IGNORE_PORT);
439 char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
441 return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
443 char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
445 return sockaddr2str(sa, NI_NUMERICHOST);
448 char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
450 return sockaddr2str(sa, NI_NUMERICHOST | IGNORE_PORT);