1 /* vi: set sw=4 ts=4: */
5 * Connect to host at port using address resolution from getaddrinfo
9 #include <netinet/in.h>
12 int setsockopt_reuseaddr(int fd)
14 return setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_1, sizeof(const_int_1));
16 int setsockopt_broadcast(int fd)
18 return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
21 void xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
23 if (connect(s, s_addr, addrlen) < 0) {
24 if (ENABLE_FEATURE_CLEAN_UP)
26 if (s_addr->sa_family == AF_INET)
27 bb_perror_msg_and_die("%s (%s)",
28 "cannot connect to remote host",
29 inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
30 bb_perror_msg_and_die("cannot connect to remote host");
34 /* Return port number for a service.
35 * If "port" is a number use it as the port.
36 * If "port" is a name it is looked up in /etc/services, if it isnt found return
38 unsigned bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
40 unsigned port_nr = default_port;
44 /* Since this is a lib function, we're not allowed to reset errno to 0.
45 * Doing so could break an app that is deferring checking of errno. */
47 port_nr = bb_strtou(port, NULL, 10);
48 if (errno || port_nr > 65535) {
49 struct servent *tserv = getservbyname(port, protocol);
50 port_nr = default_port;
52 port_nr = ntohs(tserv->s_port);
56 return (uint16_t)port_nr;
60 /* "Old" networking API - only IPv4 */
63 void bb_lookup_host(struct sockaddr_in *s_in, const char *host)
67 memset(s_in, 0, sizeof(struct sockaddr_in));
68 s_in->sin_family = AF_INET;
69 he = xgethostbyname(host);
70 memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
74 int xconnect_tcp_v4(struct sockaddr_in *s_addr)
76 int s = xsocket(AF_INET, SOCK_STREAM, 0);
77 xconnect(s, (struct sockaddr*) s_addr, sizeof(*s_addr));
82 /* "New" networking API */
85 int get_nport(len_and_sockaddr *lsa)
87 #if ENABLE_FEATURE_IPV6
88 if (lsa->sa.sa_family == AF_INET6) {
89 return lsa->sin6.sin6_port;
92 if (lsa->sa.sa_family == AF_INET) {
93 return lsa->sin.sin_port;
95 /* What? UNIX socket? IPX?? :) */
99 void set_nport(len_and_sockaddr *lsa, unsigned port)
101 #if ENABLE_FEATURE_IPV6
102 if (lsa->sa.sa_family == AF_INET6) {
103 lsa->sin6.sin6_port = port;
107 if (lsa->sa.sa_family == AF_INET) {
108 lsa->sin.sin_port = port;
111 /* What? UNIX socket? IPX?? :) */
114 /* host: "1.2.3.4[:port]", "www.google.com[:port]"
115 * port: if neither of above specifies port #
117 static len_and_sockaddr* str2sockaddr(const char *host, int port, int ai_flags)
120 len_and_sockaddr *r; // = NULL;
121 struct addrinfo *result = NULL;
122 const char *org_host = host; /* only for error msg */
124 struct addrinfo hint;
126 /* Ugly parsing of host:addr */
127 if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
129 cp = strchr(host, ']');
130 if (!cp || cp[1] != ':') /* Malformed: must have [xx]:nn */
131 bb_error_msg_and_die("bad address '%s'", org_host);
132 //return r; /* return NULL */
134 cp = strrchr(host, ':');
135 if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
136 /* There is more than one ':' (e.g. "::1") */
137 cp = NULL; /* it's not a port spec */
141 int sz = cp - host + 1;
142 host = safe_strncpy(alloca(sz), host, sz);
143 if (ENABLE_FEATURE_IPV6 && *cp != ':')
149 memset(&hint, 0 , sizeof(hint));
150 /* hint.ai_family = AF_UNSPEC; - zero anyway */
151 #if !ENABLE_FEATURE_IPV6
152 hint.ai_family = AF_INET; /* do not try to find IPv6 */
154 /* Needed. Or else we will get each address thrice (or more)
155 * for each possible socket type (tcp,udp,raw...): */
156 hint.ai_socktype = SOCK_STREAM;
157 hint.ai_flags = ai_flags;
158 rc = getaddrinfo(host, NULL, &hint, &result);
160 bb_error_msg_and_die("bad address '%s'", org_host);
161 r = xmalloc(offsetof(len_and_sockaddr, sa) + result->ai_addrlen);
162 r->len = result->ai_addrlen;
163 memcpy(&r->sa, result->ai_addr, result->ai_addrlen);
164 set_nport(r, htons(port));
165 freeaddrinfo(result);
169 len_and_sockaddr* host2sockaddr(const char *host, int port)
171 return str2sockaddr(host, port, 0);
174 static len_and_sockaddr* dotted2sockaddr(const char *host, int port)
176 return str2sockaddr(host, port, NI_NUMERICHOST);
179 int xsocket_stream(len_and_sockaddr **lsap)
181 len_and_sockaddr *lsa;
183 int len = sizeof(struct sockaddr_in);
184 int family = AF_INET;
186 #if ENABLE_FEATURE_IPV6
187 fd = socket(AF_INET6, SOCK_STREAM, 0);
189 len = sizeof(struct sockaddr_in6);
194 fd = xsocket(AF_INET, SOCK_STREAM, 0);
196 lsa = xzalloc(offsetof(len_and_sockaddr, sa) + len);
198 lsa->sa.sa_family = family;
203 int create_and_bind_stream_or_die(const char *bindaddr, int port)
206 len_and_sockaddr *lsa;
208 if (bindaddr && bindaddr[0]) {
209 lsa = dotted2sockaddr(bindaddr, port);
210 /* currently NULL check is in str2sockaddr */
212 // bb_error_msg_and_die("bad address '%s'", bindaddr);
213 /* user specified bind addr dictates family */
214 fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
216 fd = xsocket_stream(&lsa);
217 set_nport(lsa, htons(port));
219 setsockopt_reuseaddr(fd);
220 xbind(fd, &lsa->sa, lsa->len);
225 int create_and_connect_stream_or_die(const char *peer, int port)
228 len_and_sockaddr *lsa;
230 lsa = host2sockaddr(peer, port);
231 /* currently NULL check is in str2sockaddr */
233 // bb_error_msg_and_die("bad address '%s'", peer);
234 fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
235 setsockopt_reuseaddr(fd);
236 xconnect(fd, &lsa->sa, lsa->len);
241 int xconnect_stream(const len_and_sockaddr *lsa)
243 int fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
244 xconnect(fd, &lsa->sa, lsa->len);
248 static char* sockaddr2str(const struct sockaddr *sa, socklen_t salen, int flags)
252 int rc = getnameinfo(sa, salen,
255 /* do not resolve port# into service _name_ */
256 flags | NI_NUMERICSERV
260 #if ENABLE_FEATURE_IPV6
261 if (sa->sa_family == AF_INET6)
262 return xasprintf("[%s]:%s", host, serv);
264 /* For now we don't support anything else, so it has to be INET */
265 /*if (sa->sa_family == AF_INET)*/
266 return xasprintf("%s:%s", host, serv);
269 char* xmalloc_sockaddr2host(const struct sockaddr *sa, socklen_t salen)
271 return sockaddr2str(sa, salen, 0);
274 char* xmalloc_sockaddr2dotted(const struct sockaddr *sa, socklen_t salen)
276 return sockaddr2str(sa, salen, NI_NUMERICHOST);