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 /* "New" networking API */
102 int FAST_FUNC get_nport(const struct sockaddr *sa)
104 #if ENABLE_FEATURE_IPV6
105 if (sa->sa_family == AF_INET6) {
106 return ((struct sockaddr_in6*)sa)->sin6_port;
109 if (sa->sa_family == AF_INET) {
110 return ((struct sockaddr_in*)sa)->sin_port;
112 /* What? UNIX socket? IPX?? :) */
116 void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port)
118 #if ENABLE_FEATURE_IPV6
119 if (lsa->u.sa.sa_family == AF_INET6) {
120 lsa->u.sin6.sin6_port = port;
124 if (lsa->u.sa.sa_family == AF_INET) {
125 lsa->u.sin.sin_port = port;
128 /* What? UNIX socket? IPX?? :) */
131 /* We hijack this constant to mean something else */
132 /* It doesn't hurt because we will remove this bit anyway */
133 #define DIE_ON_ERROR AI_CANONNAME
135 /* host: "1.2.3.4[:port]", "www.google.com[:port]"
136 * port: if neither of above specifies port # */
137 static len_and_sockaddr* str2sockaddr(
138 const char *host, int port,
139 IF_FEATURE_IPV6(sa_family_t af,)
142 IF_NOT_FEATURE_IPV6(sa_family_t af = AF_INET;)
145 struct addrinfo *result = NULL;
146 struct addrinfo *used_res;
147 const char *org_host = host; /* only for error msg */
149 struct addrinfo hint;
151 if (ENABLE_FEATURE_UNIX_LOCAL && strncmp(host, "local:", 6) == 0) {
152 struct sockaddr_un *sun;
154 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_un));
155 r->len = sizeof(struct sockaddr_un);
156 r->u.sa.sa_family = AF_UNIX;
157 sun = (struct sockaddr_un *)&r->u.sa;
158 safe_strncpy(sun->sun_path, host + 6, sizeof(sun->sun_path));
164 /* Ugly parsing of host:addr */
165 if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
166 /* Even uglier parsing of [xx]:nn */
168 cp = strchr(host, ']');
169 if (!cp || (cp[1] != ':' && cp[1] != '\0')) {
170 /* Malformed: must be [xx]:nn or [xx] */
171 bb_error_msg("bad address '%s'", org_host);
172 if (ai_flags & DIE_ON_ERROR)
177 cp = strrchr(host, ':');
178 if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
179 /* There is more than one ':' (e.g. "::1") */
180 cp = NULL; /* it's not a port spec */
183 if (cp) { /* points to ":" or "]:" */
184 int sz = cp - host + 1;
186 host = safe_strncpy(alloca(sz), host, sz);
187 if (ENABLE_FEATURE_IPV6 && *cp != ':') {
189 if (*cp == '\0') /* [xx] without port */
193 port = bb_strtou(cp, NULL, 10);
194 if (errno || (unsigned)port > 0xffff) {
195 bb_error_msg("bad port spec '%s'", org_host);
196 if (ai_flags & DIE_ON_ERROR)
203 /* Next two if blocks allow to skip getaddrinfo()
204 * in case host name is a numeric IP(v6) address.
205 * getaddrinfo() initializes DNS resolution machinery,
206 * scans network config and such - tens of syscalls.
208 /* If we were not asked specifically for IPv6,
209 * check whether this is a numeric IPv4 */
210 IF_FEATURE_IPV6(if(af != AF_INET6)) {
212 if (inet_aton(host, &in4) != 0) {
213 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in));
214 r->len = sizeof(struct sockaddr_in);
215 r->u.sa.sa_family = AF_INET;
216 r->u.sin.sin_addr = in4;
220 #if ENABLE_FEATURE_IPV6
221 /* If we were not asked specifically for IPv4,
222 * check whether this is a numeric IPv6 */
225 if (inet_pton(AF_INET6, host, &in6) > 0) {
226 r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in6));
227 r->len = sizeof(struct sockaddr_in6);
228 r->u.sa.sa_family = AF_INET6;
229 r->u.sin6.sin6_addr = in6;
235 memset(&hint, 0 , sizeof(hint));
237 /* Needed. Or else we will get each address thrice (or more)
238 * for each possible socket type (tcp,udp,raw...): */
239 hint.ai_socktype = SOCK_STREAM;
240 hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
241 rc = getaddrinfo(host, NULL, &hint, &result);
243 bb_error_msg("bad address '%s'", org_host);
244 if (ai_flags & DIE_ON_ERROR)
249 #if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
251 if (used_res->ai_family == AF_INET)
253 used_res = used_res->ai_next;
260 r = xmalloc(LSA_LEN_SIZE + used_res->ai_addrlen);
261 r->len = used_res->ai_addrlen;
262 memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
265 set_nport(r, htons(port));
267 freeaddrinfo(result);
270 #if !ENABLE_FEATURE_IPV6
271 #define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
274 #if ENABLE_FEATURE_IPV6
275 len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
277 return str2sockaddr(host, port, af, 0);
280 len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
282 return str2sockaddr(host, port, af, DIE_ON_ERROR);
286 len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
288 return str2sockaddr(host, port, AF_UNSPEC, 0);
291 len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
293 return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
296 len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
298 return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
302 int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, IF_FEATURE_IPV6(int family,) int sock_type)
304 IF_NOT_FEATURE_IPV6(enum { family = AF_INET };)
305 len_and_sockaddr *lsa;
309 #if ENABLE_FEATURE_IPV6
310 if (family == AF_UNSPEC) {
311 fd = socket(AF_INET6, sock_type, 0);
319 fd = xsocket(family, sock_type, 0);
320 len = sizeof(struct sockaddr_in);
321 #if ENABLE_FEATURE_IPV6
322 if (family == AF_INET6) {
324 len = sizeof(struct sockaddr_in6);
327 lsa = xzalloc(LSA_LEN_SIZE + len);
329 lsa->u.sa.sa_family = family;
334 int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
336 return xsocket_type(lsap, IF_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
339 static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
342 len_and_sockaddr *lsa;
344 if (bindaddr && bindaddr[0]) {
345 lsa = xdotted2sockaddr(bindaddr, port);
346 /* user specified bind addr dictates family */
347 fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
349 fd = xsocket_type(&lsa, IF_FEATURE_IPV6(AF_UNSPEC,) sock_type);
350 set_nport(lsa, htons(port));
352 setsockopt_reuseaddr(fd);
353 xbind(fd, &lsa->u.sa, lsa->len);
358 int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
360 return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
363 int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
365 return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
369 int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
372 len_and_sockaddr *lsa;
374 lsa = xhost2sockaddr(peer, port);
375 fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
376 setsockopt_reuseaddr(fd);
377 xconnect(fd, &lsa->u.sa, lsa->len);
382 int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
384 int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
385 xconnect(fd, &lsa->u.sa, lsa->len);
389 /* We hijack this constant to mean something else */
390 /* It doesn't hurt because we will add this bit anyway */
391 #define IGNORE_PORT NI_NUMERICSERV
392 static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
399 if (ENABLE_FEATURE_UNIX_LOCAL && sa->sa_family == AF_UNIX) {
400 struct sockaddr_un *sun = (struct sockaddr_un *)sa;
401 return xasprintf("local:%.*s",
402 (int) sizeof(sun->sun_path),
406 salen = LSA_SIZEOF_SA;
407 #if ENABLE_FEATURE_IPV6
408 if (sa->sa_family == AF_INET)
409 salen = sizeof(struct sockaddr_in);
410 if (sa->sa_family == AF_INET6)
411 salen = sizeof(struct sockaddr_in6);
413 rc = getnameinfo(sa, salen,
415 /* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
417 /* do not resolve port# into service _name_ */
418 flags | NI_NUMERICSERV
422 if (flags & IGNORE_PORT)
423 return xstrdup(host);
424 #if ENABLE_FEATURE_IPV6
425 if (sa->sa_family == AF_INET6) {
426 if (strchr(host, ':')) /* heh, it's not a resolved hostname */
427 return xasprintf("[%s]:%s", host, serv);
428 /*return xasprintf("%s:%s", host, serv);*/
429 /* - fall through instead */
432 /* For now we don't support anything else, so it has to be INET */
433 /*if (sa->sa_family == AF_INET)*/
434 return xasprintf("%s:%s", host, serv);
435 /*return xstrdup(host);*/
438 char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
440 return sockaddr2str(sa, 0);
443 char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
445 return sockaddr2str(sa, IGNORE_PORT);
448 char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
450 return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
452 char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
454 return sockaddr2str(sa, NI_NUMERICHOST);
457 char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
459 return sockaddr2str(sa, NI_NUMERICHOST | IGNORE_PORT);