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 /* NB: passing (iface, strlen(iface) + 1) does not work!
28 * (maybe it works on _some_ kernels, but not on 2.6.26)
29 * Actually, ifr_name is at offset 0, and in practice
30 * just giving char[IFNAMSIZ] instead of struct ifreq works too.
31 * But just in case it's not true on some obscure arch... */
32 r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
34 bb_perror_msg("can't bind to interface %s", iface);
39 void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
41 if (connect(s, s_addr, addrlen) < 0) {
42 if (ENABLE_FEATURE_CLEAN_UP)
44 if (s_addr->sa_family == AF_INET)
45 bb_perror_msg_and_die("%s (%s)",
46 "cannot connect to remote host",
47 inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
48 bb_perror_msg_and_die("cannot connect to remote host");
52 /* Return port number for a service.
53 * If "port" is a number use it as the port.
54 * If "port" is a name it is looked up in /etc/services, if it isnt found return
56 unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
58 unsigned port_nr = default_port;
62 /* Since this is a lib function, we're not allowed to reset errno to 0.
63 * Doing so could break an app that is deferring checking of errno. */
65 port_nr = bb_strtou(port, NULL, 10);
66 if (errno || port_nr > 65535) {
67 struct servent *tserv = getservbyname(port, protocol);
68 port_nr = default_port;
70 port_nr = ntohs(tserv->s_port);
74 return (uint16_t)port_nr;
78 /* "Old" networking API - only IPv4 */
81 void FAST_FUNC bb_lookup_host(struct sockaddr_in *s_in, const char *host)
85 memset(s_in, 0, sizeof(struct sockaddr_in));
86 s_in->sin_family = AF_INET;
87 he = xgethostbyname(host);
88 memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
92 int FAST_FUNC xconnect_tcp_v4(struct sockaddr_in *s_addr)
94 int s = xsocket(AF_INET, SOCK_STREAM, 0);
95 xconnect(s, (struct sockaddr*) s_addr, sizeof(*s_addr));
100 /* "New" networking API */
103 int FAST_FUNC get_nport(const struct sockaddr *sa)
105 #if ENABLE_FEATURE_IPV6
106 if (sa->sa_family == AF_INET6) {
107 return ((struct sockaddr_in6*)sa)->sin6_port;
110 if (sa->sa_family == AF_INET) {
111 return ((struct sockaddr_in*)sa)->sin_port;
113 /* What? UNIX socket? IPX?? :) */
117 void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port)
119 #if ENABLE_FEATURE_IPV6
120 if (lsa->u.sa.sa_family == AF_INET6) {
121 lsa->u.sin6.sin6_port = port;
125 if (lsa->u.sa.sa_family == AF_INET) {
126 lsa->u.sin.sin_port = port;
129 /* What? UNIX socket? IPX?? :) */
132 /* We hijack this constant to mean something else */
133 /* It doesn't hurt because we will remove this bit anyway */
134 #define DIE_ON_ERROR AI_CANONNAME
136 /* host: "1.2.3.4[:port]", "www.google.com[:port]"
137 * port: if neither of above specifies port # */
138 static len_and_sockaddr* str2sockaddr(
139 const char *host, int port,
140 USE_FEATURE_IPV6(sa_family_t af,)
144 len_and_sockaddr *r = NULL;
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 /* Ugly parsing of host:addr */
152 if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
153 /* Even uglier parsing of [xx]:nn */
155 cp = strchr(host, ']');
156 if (!cp || cp[1] != ':') { /* Malformed: must have [xx]:nn */
157 bb_error_msg("bad address '%s'", org_host);
158 if (ai_flags & DIE_ON_ERROR)
163 cp = strrchr(host, ':');
164 if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
165 /* There is more than one ':' (e.g. "::1") */
166 cp = NULL; /* it's not a port spec */
169 if (cp) { /* points to ":" or "]:" */
170 int sz = cp - host + 1;
171 host = safe_strncpy(alloca(sz), host, sz);
172 if (ENABLE_FEATURE_IPV6 && *cp != ':')
175 port = bb_strtou(cp, NULL, 10);
176 if (errno || (unsigned)port > 0xffff) {
177 bb_error_msg("bad port spec '%s'", org_host);
178 if (ai_flags & DIE_ON_ERROR)
184 memset(&hint, 0 , sizeof(hint));
185 #if !ENABLE_FEATURE_IPV6
186 hint.ai_family = AF_INET; /* do not try to find IPv6 */
190 /* Needed. Or else we will get each address thrice (or more)
191 * for each possible socket type (tcp,udp,raw...): */
192 hint.ai_socktype = SOCK_STREAM;
193 hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
194 rc = getaddrinfo(host, NULL, &hint, &result);
196 bb_error_msg("bad address '%s'", org_host);
197 if (ai_flags & DIE_ON_ERROR)
202 #if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
204 if (used_res->ai_family == AF_INET)
206 used_res = used_res->ai_next;
213 r = xmalloc(offsetof(len_and_sockaddr, u.sa) + used_res->ai_addrlen);
214 r->len = used_res->ai_addrlen;
215 memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
216 set_nport(r, htons(port));
218 freeaddrinfo(result);
221 #if !ENABLE_FEATURE_IPV6
222 #define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
225 #if ENABLE_FEATURE_IPV6
226 len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
228 return str2sockaddr(host, port, af, 0);
231 len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
233 return str2sockaddr(host, port, af, DIE_ON_ERROR);
237 len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
239 return str2sockaddr(host, port, AF_UNSPEC, 0);
242 len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
244 return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
247 len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
249 return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
253 int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, USE_FEATURE_IPV6(int family,) int sock_type)
255 SKIP_FEATURE_IPV6(enum { family = AF_INET };)
256 len_and_sockaddr *lsa;
260 #if ENABLE_FEATURE_IPV6
261 if (family == AF_UNSPEC) {
262 fd = socket(AF_INET6, sock_type, 0);
270 fd = xsocket(family, sock_type, 0);
271 len = sizeof(struct sockaddr_in);
272 #if ENABLE_FEATURE_IPV6
273 if (family == AF_INET6) {
275 len = sizeof(struct sockaddr_in6);
278 lsa = xzalloc(offsetof(len_and_sockaddr, u.sa) + len);
280 lsa->u.sa.sa_family = family;
285 int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
287 return xsocket_type(lsap, USE_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
290 static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
293 len_and_sockaddr *lsa;
295 if (bindaddr && bindaddr[0]) {
296 lsa = xdotted2sockaddr(bindaddr, port);
297 /* user specified bind addr dictates family */
298 fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
300 fd = xsocket_type(&lsa, USE_FEATURE_IPV6(AF_UNSPEC,) sock_type);
301 set_nport(lsa, htons(port));
303 setsockopt_reuseaddr(fd);
304 xbind(fd, &lsa->u.sa, lsa->len);
309 int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
311 return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
314 int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
316 return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
320 int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
323 len_and_sockaddr *lsa;
325 lsa = xhost2sockaddr(peer, port);
326 fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
327 setsockopt_reuseaddr(fd);
328 xconnect(fd, &lsa->u.sa, lsa->len);
333 int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
335 int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
336 xconnect(fd, &lsa->u.sa, lsa->len);
340 /* We hijack this constant to mean something else */
341 /* It doesn't hurt because we will add this bit anyway */
342 #define IGNORE_PORT NI_NUMERICSERV
343 static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
350 salen = LSA_SIZEOF_SA;
351 #if ENABLE_FEATURE_IPV6
352 if (sa->sa_family == AF_INET)
353 salen = sizeof(struct sockaddr_in);
354 if (sa->sa_family == AF_INET6)
355 salen = sizeof(struct sockaddr_in6);
357 rc = getnameinfo(sa, salen,
359 /* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
361 /* do not resolve port# into service _name_ */
362 flags | NI_NUMERICSERV
366 if (flags & IGNORE_PORT)
367 return xstrdup(host);
368 #if ENABLE_FEATURE_IPV6
369 if (sa->sa_family == AF_INET6) {
370 if (strchr(host, ':')) /* heh, it's not a resolved hostname */
371 return xasprintf("[%s]:%s", host, serv);
372 /*return xasprintf("%s:%s", host, serv);*/
373 /* - fall through instead */
376 /* For now we don't support anything else, so it has to be INET */
377 /*if (sa->sa_family == AF_INET)*/
378 return xasprintf("%s:%s", host, serv);
379 /*return xstrdup(host);*/
382 char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
384 return sockaddr2str(sa, 0);
387 char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
389 return sockaddr2str(sa, IGNORE_PORT);
392 char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
394 return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
396 char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
398 return sockaddr2str(sa, NI_NUMERICHOST);
401 char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
403 return sockaddr2str(sa, NI_NUMERICHOST | IGNORE_PORT);