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 "can't connect to remote host",
67 inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
68 bb_perror_msg_and_die("can't 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,)
164 IF_NOT_FEATURE_IPV6(sa_family_t af = AF_INET;)
167 struct addrinfo *result = NULL;
168 struct addrinfo *used_res;
169 const char *org_host = host; /* only for error msg */
171 struct addrinfo hint;
173 if (ENABLE_FEATURE_UNIX_LOCAL && strncmp(host, "local:", 6) == 0) {
174 struct sockaddr_un *sun;
176 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_un));
177 r->len = sizeof(struct sockaddr_un);
178 r->u.sa.sa_family = AF_UNIX;
179 sun = (struct sockaddr_un *)&r->u.sa;
180 safe_strncpy(sun->sun_path, host + 6, sizeof(sun->sun_path));
186 /* Ugly parsing of host:addr */
187 if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
188 /* Even uglier parsing of [xx]:nn */
190 cp = strchr(host, ']');
191 if (!cp || (cp[1] != ':' && cp[1] != '\0')) {
192 /* Malformed: must be [xx]:nn or [xx] */
193 bb_error_msg("bad address '%s'", org_host);
194 if (ai_flags & DIE_ON_ERROR)
199 cp = strrchr(host, ':');
200 if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
201 /* There is more than one ':' (e.g. "::1") */
202 cp = NULL; /* it's not a port spec */
205 if (cp) { /* points to ":" or "]:" */
206 int sz = cp - host + 1;
208 host = safe_strncpy(alloca(sz), host, sz);
209 if (ENABLE_FEATURE_IPV6 && *cp != ':') {
211 if (*cp == '\0') /* [xx] without port */
215 port = bb_strtou(cp, NULL, 10);
216 if (errno || (unsigned)port > 0xffff) {
217 bb_error_msg("bad port spec '%s'", org_host);
218 if (ai_flags & DIE_ON_ERROR)
225 /* Next two if blocks allow to skip getaddrinfo()
226 * in case host name is a numeric IP(v6) address.
227 * getaddrinfo() initializes DNS resolution machinery,
228 * scans network config and such - tens of syscalls.
230 /* If we were not asked specifically for IPv6,
231 * check whether this is a numeric IPv4 */
232 IF_FEATURE_IPV6(if(af != AF_INET6)) {
234 if (inet_aton(host, &in4) != 0) {
235 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in));
236 r->len = sizeof(struct sockaddr_in);
237 r->u.sa.sa_family = AF_INET;
238 r->u.sin.sin_addr = in4;
242 #if ENABLE_FEATURE_IPV6
243 /* If we were not asked specifically for IPv4,
244 * check whether this is a numeric IPv6 */
247 if (inet_pton(AF_INET6, host, &in6) > 0) {
248 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in6));
249 r->len = sizeof(struct sockaddr_in6);
250 r->u.sa.sa_family = AF_INET6;
251 r->u.sin6.sin6_addr = in6;
257 memset(&hint, 0 , sizeof(hint));
259 /* Needed. Or else we will get each address thrice (or more)
260 * for each possible socket type (tcp,udp,raw...): */
261 hint.ai_socktype = SOCK_STREAM;
262 hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
263 rc = getaddrinfo(host, NULL, &hint, &result);
265 bb_error_msg("bad address '%s'", org_host);
266 if (ai_flags & DIE_ON_ERROR)
271 #if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
273 if (used_res->ai_family == AF_INET)
275 used_res = used_res->ai_next;
282 r = xmalloc(LSA_LEN_SIZE + used_res->ai_addrlen);
283 r->len = used_res->ai_addrlen;
284 memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
287 set_nport(r, htons(port));
289 freeaddrinfo(result);
292 #if !ENABLE_FEATURE_IPV6
293 #define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
296 #if ENABLE_FEATURE_IPV6
297 len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
299 return str2sockaddr(host, port, af, 0);
302 len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
304 return str2sockaddr(host, port, af, DIE_ON_ERROR);
308 len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
310 return str2sockaddr(host, port, AF_UNSPEC, 0);
313 len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
315 return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
318 len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
320 return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
324 int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, IF_FEATURE_IPV6(int family,) int sock_type)
326 IF_NOT_FEATURE_IPV6(enum { family = AF_INET };)
327 len_and_sockaddr *lsa;
331 #if ENABLE_FEATURE_IPV6
332 if (family == AF_UNSPEC) {
333 fd = socket(AF_INET6, sock_type, 0);
341 fd = xsocket(family, sock_type, 0);
342 len = sizeof(struct sockaddr_in);
343 #if ENABLE_FEATURE_IPV6
344 if (family == AF_INET6) {
346 len = sizeof(struct sockaddr_in6);
349 lsa = xzalloc(offsetof(len_and_sockaddr, u.sa) + len);
351 lsa->u.sa.sa_family = family;
356 int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
358 return xsocket_type(lsap, IF_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
361 static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
364 len_and_sockaddr *lsa;
366 if (bindaddr && bindaddr[0]) {
367 lsa = xdotted2sockaddr(bindaddr, port);
368 /* user specified bind addr dictates family */
369 fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
371 fd = xsocket_type(&lsa, IF_FEATURE_IPV6(AF_UNSPEC,) sock_type);
372 set_nport(lsa, htons(port));
374 setsockopt_reuseaddr(fd);
375 xbind(fd, &lsa->u.sa, lsa->len);
380 int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
382 return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
385 int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
387 return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
391 int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
394 len_and_sockaddr *lsa;
396 lsa = xhost2sockaddr(peer, port);
397 fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
398 setsockopt_reuseaddr(fd);
399 xconnect(fd, &lsa->u.sa, lsa->len);
404 int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
406 int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
407 xconnect(fd, &lsa->u.sa, lsa->len);
411 /* We hijack this constant to mean something else */
412 /* It doesn't hurt because we will add this bit anyway */
413 #define IGNORE_PORT NI_NUMERICSERV
414 static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
421 if (ENABLE_FEATURE_UNIX_LOCAL && sa->sa_family == AF_UNIX) {
422 struct sockaddr_un *sun = (struct sockaddr_un *)sa;
423 return xasprintf("local:%.*s",
424 (int) sizeof(sun->sun_path),
428 salen = LSA_SIZEOF_SA;
429 #if ENABLE_FEATURE_IPV6
430 if (sa->sa_family == AF_INET)
431 salen = sizeof(struct sockaddr_in);
432 if (sa->sa_family == AF_INET6)
433 salen = sizeof(struct sockaddr_in6);
435 rc = getnameinfo(sa, salen,
437 /* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
439 /* do not resolve port# into service _name_ */
440 flags | NI_NUMERICSERV
444 if (flags & IGNORE_PORT)
445 return xstrdup(host);
446 #if ENABLE_FEATURE_IPV6
447 if (sa->sa_family == AF_INET6) {
448 if (strchr(host, ':')) /* heh, it's not a resolved hostname */
449 return xasprintf("[%s]:%s", host, serv);
450 /*return xasprintf("%s:%s", host, serv);*/
451 /* - fall through instead */
454 /* For now we don't support anything else, so it has to be INET */
455 /*if (sa->sa_family == AF_INET)*/
456 return xasprintf("%s:%s", host, serv);
457 /*return xstrdup(host);*/
460 char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
462 return sockaddr2str(sa, 0);
465 char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
467 return sockaddr2str(sa, IGNORE_PORT);
470 char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
472 return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
474 char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
476 return sockaddr2str(sa, NI_NUMERICHOST);
479 char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
481 return sockaddr2str(sa, NI_NUMERICHOST | IGNORE_PORT);