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));
25 #ifdef SO_BINDTODEVICE
26 int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
30 strncpy_IFNAMSIZ(ifr.ifr_name, iface);
31 /* NB: passing (iface, strlen(iface) + 1) does not work!
32 * (maybe it works on _some_ kernels, but not on 2.6.26)
33 * Actually, ifr_name is at offset 0, and in practice
34 * just giving char[IFNAMSIZ] instead of struct ifreq works too.
35 * But just in case it's not true on some obscure arch... */
36 r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
38 bb_perror_msg("can't bind to interface %s", iface);
42 int FAST_FUNC setsockopt_bindtodevice(int fd UNUSED_PARAM,
43 const char *iface UNUSED_PARAM)
45 bb_error_msg("SO_BINDTODEVICE is not supported on this system");
50 static len_and_sockaddr* get_lsa(int fd, int (*get_name)(int fd, struct sockaddr *addr, socklen_t *addrlen))
53 len_and_sockaddr *lsa_ptr;
55 lsa.len = LSA_SIZEOF_SA;
56 if (get_name(fd, &lsa.u.sa, &lsa.len) != 0)
59 lsa_ptr = xzalloc(LSA_LEN_SIZE + lsa.len);
60 if (lsa.len > LSA_SIZEOF_SA) { /* rarely (if ever) happens */
61 lsa_ptr->len = lsa.len;
62 get_name(fd, &lsa_ptr->u.sa, &lsa_ptr->len);
64 memcpy(lsa_ptr, &lsa, LSA_LEN_SIZE + lsa.len);
69 len_and_sockaddr* FAST_FUNC get_sock_lsa(int fd)
71 return get_lsa(fd, getsockname);
74 len_and_sockaddr* FAST_FUNC get_peer_lsa(int fd)
76 return get_lsa(fd, getpeername);
79 void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
81 if (connect(s, s_addr, addrlen) < 0) {
82 if (ENABLE_FEATURE_CLEAN_UP)
84 if (s_addr->sa_family == AF_INET)
85 bb_perror_msg_and_die("%s (%s)",
86 "can't connect to remote host",
87 inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
88 bb_perror_msg_and_die("can't connect to remote host");
92 /* Return port number for a service.
93 * If "port" is a number use it as the port.
94 * If "port" is a name it is looked up in /etc/services,
95 * if it isnt found return default_port
97 unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
99 unsigned port_nr = default_port;
103 /* Since this is a lib function, we're not allowed to reset errno to 0.
104 * Doing so could break an app that is deferring checking of errno. */
106 port_nr = bb_strtou(port, NULL, 10);
107 if (errno || port_nr > 65535) {
108 struct servent *tserv = getservbyname(port, protocol);
109 port_nr = default_port;
111 port_nr = ntohs(tserv->s_port);
115 return (uint16_t)port_nr;
119 /* "New" networking API */
122 int FAST_FUNC get_nport(const struct sockaddr *sa)
124 #if ENABLE_FEATURE_IPV6
125 if (sa->sa_family == AF_INET6) {
126 return ((struct sockaddr_in6*)sa)->sin6_port;
129 if (sa->sa_family == AF_INET) {
130 return ((struct sockaddr_in*)sa)->sin_port;
132 /* What? UNIX socket? IPX?? :) */
136 void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port)
138 #if ENABLE_FEATURE_IPV6
139 if (lsa->u.sa.sa_family == AF_INET6) {
140 lsa->u.sin6.sin6_port = port;
144 if (lsa->u.sa.sa_family == AF_INET) {
145 lsa->u.sin.sin_port = port;
148 /* What? UNIX socket? IPX?? :) */
151 /* We hijack this constant to mean something else */
152 /* It doesn't hurt because we will remove this bit anyway */
153 #define DIE_ON_ERROR AI_CANONNAME
155 /* host: "1.2.3.4[:port]", "www.google.com[:port]"
156 * port: if neither of above specifies port # */
157 static len_and_sockaddr* str2sockaddr(
158 const char *host, int port,
159 IF_FEATURE_IPV6(sa_family_t af,)
162 IF_NOT_FEATURE_IPV6(sa_family_t af = AF_INET;)
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 /* Next two if blocks allow to skip getaddrinfo()
224 * in case host name is a numeric IP(v6) address.
225 * getaddrinfo() initializes DNS resolution machinery,
226 * scans network config and such - tens of syscalls.
228 /* If we were not asked specifically for IPv6,
229 * check whether this is a numeric IPv4 */
230 IF_FEATURE_IPV6(if(af != AF_INET6)) {
232 if (inet_aton(host, &in4) != 0) {
233 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in));
234 r->len = sizeof(struct sockaddr_in);
235 r->u.sa.sa_family = AF_INET;
236 r->u.sin.sin_addr = in4;
240 #if ENABLE_FEATURE_IPV6
241 /* If we were not asked specifically for IPv4,
242 * check whether this is a numeric IPv6 */
245 if (inet_pton(AF_INET6, host, &in6) > 0) {
246 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in6));
247 r->len = sizeof(struct sockaddr_in6);
248 r->u.sa.sa_family = AF_INET6;
249 r->u.sin6.sin6_addr = in6;
255 memset(&hint, 0 , sizeof(hint));
257 /* Needed. Or else we will get each address thrice (or more)
258 * for each possible socket type (tcp,udp,raw...): */
259 hint.ai_socktype = SOCK_STREAM;
260 hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
261 rc = getaddrinfo(host, NULL, &hint, &result);
263 bb_error_msg("bad address '%s'", org_host);
264 if (ai_flags & DIE_ON_ERROR)
269 #if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
271 if (used_res->ai_family == AF_INET)
273 used_res = used_res->ai_next;
280 r = xmalloc(LSA_LEN_SIZE + used_res->ai_addrlen);
281 r->len = used_res->ai_addrlen;
282 memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
285 set_nport(r, htons(port));
287 freeaddrinfo(result);
290 #if !ENABLE_FEATURE_IPV6
291 #define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
294 #if ENABLE_FEATURE_IPV6
295 len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
297 return str2sockaddr(host, port, af, 0);
300 len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
302 return str2sockaddr(host, port, af, DIE_ON_ERROR);
306 len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
308 return str2sockaddr(host, port, AF_UNSPEC, 0);
311 len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
313 return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
316 len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
318 return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
322 int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, IF_FEATURE_IPV6(int family,) int sock_type)
324 IF_NOT_FEATURE_IPV6(enum { family = AF_INET };)
325 len_and_sockaddr *lsa;
329 #if ENABLE_FEATURE_IPV6
330 if (family == AF_UNSPEC) {
331 fd = socket(AF_INET6, sock_type, 0);
339 fd = xsocket(family, sock_type, 0);
340 len = sizeof(struct sockaddr_in);
341 #if ENABLE_FEATURE_IPV6
342 if (family == AF_INET6) {
344 len = sizeof(struct sockaddr_in6);
347 lsa = xzalloc(LSA_LEN_SIZE + len);
349 lsa->u.sa.sa_family = family;
354 int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
356 return xsocket_type(lsap, IF_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
359 static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
362 len_and_sockaddr *lsa;
364 if (bindaddr && bindaddr[0]) {
365 lsa = xdotted2sockaddr(bindaddr, port);
366 /* user specified bind addr dictates family */
367 fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
369 fd = xsocket_type(&lsa, IF_FEATURE_IPV6(AF_UNSPEC,) sock_type);
370 set_nport(lsa, htons(port));
372 setsockopt_reuseaddr(fd);
373 xbind(fd, &lsa->u.sa, lsa->len);
378 int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
380 return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
383 int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
385 return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
389 int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
392 len_and_sockaddr *lsa;
394 lsa = xhost2sockaddr(peer, port);
395 fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
396 setsockopt_reuseaddr(fd);
397 xconnect(fd, &lsa->u.sa, lsa->len);
402 int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
404 int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
405 xconnect(fd, &lsa->u.sa, lsa->len);
409 /* We hijack this constant to mean something else */
410 /* It doesn't hurt because we will add this bit anyway */
411 #define IGNORE_PORT NI_NUMERICSERV
412 static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
419 if (ENABLE_FEATURE_UNIX_LOCAL && sa->sa_family == AF_UNIX) {
420 struct sockaddr_un *sun = (struct sockaddr_un *)sa;
421 return xasprintf("local:%.*s",
422 (int) sizeof(sun->sun_path),
426 salen = LSA_SIZEOF_SA;
427 #if ENABLE_FEATURE_IPV6
428 if (sa->sa_family == AF_INET)
429 salen = sizeof(struct sockaddr_in);
430 if (sa->sa_family == AF_INET6)
431 salen = sizeof(struct sockaddr_in6);
433 rc = getnameinfo(sa, salen,
435 /* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
437 /* do not resolve port# into service _name_ */
438 flags | NI_NUMERICSERV
442 if (flags & IGNORE_PORT)
443 return xstrdup(host);
444 #if ENABLE_FEATURE_IPV6
445 if (sa->sa_family == AF_INET6) {
446 if (strchr(host, ':')) /* heh, it's not a resolved hostname */
447 return xasprintf("[%s]:%s", host, serv);
448 /*return xasprintf("%s:%s", host, serv);*/
449 /* - fall through instead */
452 /* For now we don't support anything else, so it has to be INET */
453 /*if (sa->sa_family == AF_INET)*/
454 return xasprintf("%s:%s", host, serv);
455 /*return xstrdup(host);*/
458 char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
460 return sockaddr2str(sa, 0);
463 char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
465 return sockaddr2str(sa, IGNORE_PORT);
468 char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
470 return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
472 char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
474 return sockaddr2str(sa, NI_NUMERICHOST);
477 char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
479 return sockaddr2str(sa, NI_NUMERICHOST | IGNORE_PORT);