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 <netinet/in.h>
14 void FAST_FUNC setsockopt_reuseaddr(int fd)
16 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_1, sizeof(const_int_1));
18 int FAST_FUNC setsockopt_broadcast(int fd)
20 return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
22 int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
26 strncpy_IFNAMSIZ(ifr.ifr_name, iface);
27 /* Actually, ifr_name is at offset 0, and in practice
28 * just giving char[IFNAMSIZ] instead of struct ifreq works too.
29 * But just in case it's not true on some obscure arch... */
30 r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
32 bb_perror_msg("can't bind to interface %s", iface);
37 void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
39 if (connect(s, s_addr, addrlen) < 0) {
40 if (ENABLE_FEATURE_CLEAN_UP)
42 if (s_addr->sa_family == AF_INET)
43 bb_perror_msg_and_die("%s (%s)",
44 "cannot connect to remote host",
45 inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
46 bb_perror_msg_and_die("cannot connect to remote host");
50 /* Return port number for a service.
51 * If "port" is a number use it as the port.
52 * If "port" is a name it is looked up in /etc/services, if it isnt found return
54 unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
56 unsigned port_nr = default_port;
60 /* Since this is a lib function, we're not allowed to reset errno to 0.
61 * Doing so could break an app that is deferring checking of errno. */
63 port_nr = bb_strtou(port, NULL, 10);
64 if (errno || port_nr > 65535) {
65 struct servent *tserv = getservbyname(port, protocol);
66 port_nr = default_port;
68 port_nr = ntohs(tserv->s_port);
72 return (uint16_t)port_nr;
76 /* "Old" networking API - only IPv4 */
79 void FAST_FUNC bb_lookup_host(struct sockaddr_in *s_in, const char *host)
83 memset(s_in, 0, sizeof(struct sockaddr_in));
84 s_in->sin_family = AF_INET;
85 he = xgethostbyname(host);
86 memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
90 int FAST_FUNC xconnect_tcp_v4(struct sockaddr_in *s_addr)
92 int s = xsocket(AF_INET, SOCK_STREAM, 0);
93 xconnect(s, (struct sockaddr*) s_addr, sizeof(*s_addr));
98 /* "New" networking API */
101 int FAST_FUNC get_nport(const struct sockaddr *sa)
103 #if ENABLE_FEATURE_IPV6
104 if (sa->sa_family == AF_INET6) {
105 return ((struct sockaddr_in6*)sa)->sin6_port;
108 if (sa->sa_family == AF_INET) {
109 return ((struct sockaddr_in*)sa)->sin_port;
111 /* What? UNIX socket? IPX?? :) */
115 void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port)
117 #if ENABLE_FEATURE_IPV6
118 if (lsa->u.sa.sa_family == AF_INET6) {
119 lsa->u.sin6.sin6_port = port;
123 if (lsa->u.sa.sa_family == AF_INET) {
124 lsa->u.sin.sin_port = port;
127 /* What? UNIX socket? IPX?? :) */
130 /* We hijack this constant to mean something else */
131 /* It doesn't hurt because we will remove this bit anyway */
132 #define DIE_ON_ERROR AI_CANONNAME
134 /* host: "1.2.3.4[:port]", "www.google.com[:port]"
135 * port: if neither of above specifies port # */
136 static len_and_sockaddr* str2sockaddr(
137 const char *host, int port,
138 USE_FEATURE_IPV6(sa_family_t af,)
142 len_and_sockaddr *r = NULL;
143 struct addrinfo *result = NULL;
144 struct addrinfo *used_res;
145 const char *org_host = host; /* only for error msg */
147 struct addrinfo hint;
149 /* Ugly parsing of host:addr */
150 if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
151 /* Even uglier parsing of [xx]:nn */
153 cp = strchr(host, ']');
154 if (!cp || cp[1] != ':') { /* Malformed: must have [xx]:nn */
155 bb_error_msg("bad address '%s'", org_host);
156 if (ai_flags & DIE_ON_ERROR)
161 cp = strrchr(host, ':');
162 if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
163 /* There is more than one ':' (e.g. "::1") */
164 cp = NULL; /* it's not a port spec */
167 if (cp) { /* points to ":" or "]:" */
168 int sz = cp - host + 1;
169 host = safe_strncpy(alloca(sz), host, sz);
170 if (ENABLE_FEATURE_IPV6 && *cp != ':')
173 port = bb_strtou(cp, NULL, 10);
174 if (errno || (unsigned)port > 0xffff) {
175 bb_error_msg("bad port spec '%s'", org_host);
176 if (ai_flags & DIE_ON_ERROR)
182 memset(&hint, 0 , sizeof(hint));
183 #if !ENABLE_FEATURE_IPV6
184 hint.ai_family = AF_INET; /* do not try to find IPv6 */
188 /* Needed. Or else we will get each address thrice (or more)
189 * for each possible socket type (tcp,udp,raw...): */
190 hint.ai_socktype = SOCK_STREAM;
191 hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
192 rc = getaddrinfo(host, NULL, &hint, &result);
194 bb_error_msg("bad address '%s'", org_host);
195 if (ai_flags & DIE_ON_ERROR)
200 #if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
202 if (used_res->ai_family == AF_INET)
204 used_res = used_res->ai_next;
211 r = xmalloc(offsetof(len_and_sockaddr, u.sa) + used_res->ai_addrlen);
212 r->len = used_res->ai_addrlen;
213 memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
214 set_nport(r, htons(port));
216 freeaddrinfo(result);
219 #if !ENABLE_FEATURE_IPV6
220 #define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
223 #if ENABLE_FEATURE_IPV6
224 len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
226 return str2sockaddr(host, port, af, 0);
229 len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
231 return str2sockaddr(host, port, af, DIE_ON_ERROR);
235 len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
237 return str2sockaddr(host, port, AF_UNSPEC, 0);
240 len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
242 return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
245 len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
247 return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
251 int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, USE_FEATURE_IPV6(int family,) int sock_type)
253 SKIP_FEATURE_IPV6(enum { family = AF_INET };)
254 len_and_sockaddr *lsa;
258 #if ENABLE_FEATURE_IPV6
259 if (family == AF_UNSPEC) {
260 fd = socket(AF_INET6, sock_type, 0);
268 fd = xsocket(family, sock_type, 0);
269 len = sizeof(struct sockaddr_in);
270 #if ENABLE_FEATURE_IPV6
271 if (family == AF_INET6) {
273 len = sizeof(struct sockaddr_in6);
276 lsa = xzalloc(offsetof(len_and_sockaddr, u.sa) + len);
278 lsa->u.sa.sa_family = family;
283 int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
285 return xsocket_type(lsap, USE_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
288 static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
291 len_and_sockaddr *lsa;
293 if (bindaddr && bindaddr[0]) {
294 lsa = xdotted2sockaddr(bindaddr, port);
295 /* user specified bind addr dictates family */
296 fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
298 fd = xsocket_type(&lsa, USE_FEATURE_IPV6(AF_UNSPEC,) sock_type);
299 set_nport(lsa, htons(port));
301 setsockopt_reuseaddr(fd);
302 xbind(fd, &lsa->u.sa, lsa->len);
307 int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
309 return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
312 int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
314 return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
318 int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
321 len_and_sockaddr *lsa;
323 lsa = xhost2sockaddr(peer, port);
324 fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
325 setsockopt_reuseaddr(fd);
326 xconnect(fd, &lsa->u.sa, lsa->len);
331 int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
333 int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
334 xconnect(fd, &lsa->u.sa, lsa->len);
338 /* We hijack this constant to mean something else */
339 /* It doesn't hurt because we will add this bit anyway */
340 #define IGNORE_PORT NI_NUMERICSERV
341 static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
348 salen = LSA_SIZEOF_SA;
349 #if ENABLE_FEATURE_IPV6
350 if (sa->sa_family == AF_INET)
351 salen = sizeof(struct sockaddr_in);
352 if (sa->sa_family == AF_INET6)
353 salen = sizeof(struct sockaddr_in6);
355 rc = getnameinfo(sa, salen,
357 /* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
359 /* do not resolve port# into service _name_ */
360 flags | NI_NUMERICSERV
364 if (flags & IGNORE_PORT)
365 return xstrdup(host);
366 #if ENABLE_FEATURE_IPV6
367 if (sa->sa_family == AF_INET6) {
368 if (strchr(host, ':')) /* heh, it's not a resolved hostname */
369 return xasprintf("[%s]:%s", host, serv);
370 /*return xasprintf("%s:%s", host, serv);*/
371 /* - fall through instead */
374 /* For now we don't support anything else, so it has to be INET */
375 /*if (sa->sa_family == AF_INET)*/
376 return xasprintf("%s:%s", host, serv);
377 /*return xstrdup(host);*/
380 char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
382 return sockaddr2str(sa, 0);
385 char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
387 return sockaddr2str(sa, IGNORE_PORT);
390 char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
392 return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
394 char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
396 return sockaddr2str(sa, NI_NUMERICHOST);
399 char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
401 return sockaddr2str(sa, NI_NUMERICHOST | IGNORE_PORT);