1 /* vi: set sw=4 ts=4: */
5 * Connect to host at port using address resolution from getaddrinfo
9 #include <netinet/in.h>
12 static const int one = 1;
13 int setsockopt_reuseaddr(int fd)
15 return setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
17 int setsockopt_broadcast(int fd)
19 return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one));
22 void xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
24 if (connect(s, s_addr, addrlen) < 0) {
25 if (ENABLE_FEATURE_CLEAN_UP)
27 if (s_addr->sa_family == AF_INET)
28 bb_perror_msg_and_die("%s (%s)",
29 "cannot connect to remote host",
30 inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
31 bb_perror_msg_and_die("cannot connect to remote host");
35 /* Return port number for a service.
36 * If "port" is a number use it as the port.
37 * If "port" is a name it is looked up in /etc/services, if it isnt found return
39 unsigned bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
41 unsigned port_nr = default_port;
45 /* Since this is a lib function, we're not allowed to reset errno to 0.
46 * Doing so could break an app that is deferring checking of errno. */
48 port_nr = bb_strtou(port, NULL, 10);
49 if (errno || port_nr > 65535) {
50 struct servent *tserv = getservbyname(port, protocol);
51 port_nr = default_port;
53 port_nr = ntohs(tserv->s_port);
57 return (uint16_t)port_nr;
61 /* "Old" networking API - only IPv4 */
64 void bb_lookup_host(struct sockaddr_in *s_in, const char *host)
68 memset(s_in, 0, sizeof(struct sockaddr_in));
69 s_in->sin_family = AF_INET;
70 he = xgethostbyname(host);
71 memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
75 int xconnect_tcp_v4(struct sockaddr_in *s_addr)
77 int s = xsocket(AF_INET, SOCK_STREAM, 0);
78 xconnect(s, (struct sockaddr*) s_addr, sizeof(*s_addr));
83 /* "New" networking API */
86 int get_nport(len_and_sockaddr *lsa)
88 #if ENABLE_FEATURE_IPV6
89 if (lsa->sa.sa_family == AF_INET6) {
90 return lsa->sin6.sin6_port;
93 if (lsa->sa.sa_family == AF_INET) {
94 return lsa->sin.sin_port;
96 /* What? UNIX socket? IPX?? :) */
100 void set_nport(len_and_sockaddr *lsa, unsigned port)
102 #if ENABLE_FEATURE_IPV6
103 if (lsa->sa.sa_family == AF_INET6) {
104 lsa->sin6.sin6_port = port;
108 if (lsa->sa.sa_family == AF_INET) {
109 lsa->sin.sin_port = port;
112 /* What? UNIX socket? IPX?? :) */
115 /* host: "1.2.3.4[:port]", "www.google.com[:port]"
116 * port: if neither of above specifies port #
118 static len_and_sockaddr* str2sockaddr(const char *host, int port, int ai_flags)
121 len_and_sockaddr *r; // = NULL;
122 struct addrinfo *result = NULL;
123 const char *org_host = host; /* only for error msg */
125 struct addrinfo hint;
127 /* Ugly parsing of host:addr */
128 if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
130 cp = strchr(host, ']');
131 if (!cp || cp[1] != ':') /* Malformed: must have [xx]:nn */
132 bb_error_msg_and_die("bad address '%s'", org_host);
133 //return r; /* return NULL */
135 cp = strrchr(host, ':');
136 if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
137 /* There is more than one ':' (e.g. "::1") */
138 cp = NULL; /* it's not a port spec */
142 int sz = cp - host + 1;
143 host = safe_strncpy(alloca(sz), host, sz);
144 if (ENABLE_FEATURE_IPV6 && *cp != ':')
150 memset(&hint, 0 , sizeof(hint));
151 /* hint.ai_family = AF_UNSPEC; - zero anyway */
152 #if !ENABLE_FEATURE_IPV6
153 hint.ai_family = AF_INET; /* do not try to find IPv6 */
155 /* Needed. Or else we will get each address thrice (or more)
156 * for each possible socket type (tcp,udp,raw...): */
157 hint.ai_socktype = SOCK_STREAM;
158 hint.ai_flags = ai_flags;
159 rc = getaddrinfo(host, NULL, &hint, &result);
161 bb_error_msg_and_die("bad address '%s'", org_host);
162 r = xmalloc(offsetof(len_and_sockaddr, sa) + result->ai_addrlen);
163 r->len = result->ai_addrlen;
164 memcpy(&r->sa, result->ai_addr, result->ai_addrlen);
165 set_nport(r, htons(port));
166 freeaddrinfo(result);
170 len_and_sockaddr* host2sockaddr(const char *host, int port)
172 return str2sockaddr(host, port, 0);
175 static len_and_sockaddr* dotted2sockaddr(const char *host, int port)
177 return str2sockaddr(host, port, NI_NUMERICHOST);
180 int xsocket_stream(len_and_sockaddr **lsap)
182 len_and_sockaddr *lsa;
184 int len = sizeof(struct sockaddr_in);
185 int family = AF_INET;
187 #if ENABLE_FEATURE_IPV6
188 fd = socket(AF_INET6, SOCK_STREAM, 0);
190 len = sizeof(struct sockaddr_in6);
195 fd = xsocket(AF_INET, SOCK_STREAM, 0);
197 lsa = xzalloc(offsetof(len_and_sockaddr, sa) + len);
199 lsa->sa.sa_family = family;
204 int create_and_bind_stream_or_die(const char *bindaddr, int port)
207 len_and_sockaddr *lsa;
209 if (bindaddr && bindaddr[0]) {
210 lsa = dotted2sockaddr(bindaddr, port);
211 /* currently NULL check is in str2sockaddr */
213 // bb_error_msg_and_die("bad address '%s'", bindaddr);
214 /* user specified bind addr dictates family */
215 fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
217 fd = xsocket_stream(&lsa);
218 set_nport(lsa, htons(port));
220 setsockopt_reuseaddr(fd);
221 xbind(fd, &lsa->sa, lsa->len);
226 int create_and_connect_stream_or_die(const char *peer, int port)
229 len_and_sockaddr *lsa;
231 lsa = host2sockaddr(peer, port);
232 /* currently NULL check is in str2sockaddr */
234 // bb_error_msg_and_die("bad address '%s'", peer);
235 fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
236 setsockopt_reuseaddr(fd);
237 xconnect(fd, &lsa->sa, lsa->len);
242 int xconnect_stream(const len_and_sockaddr *lsa)
244 int fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
245 xconnect(fd, &lsa->sa, lsa->len);
249 static char* sockaddr2str(const struct sockaddr *sa, socklen_t salen, int flags)
253 int rc = getnameinfo(sa, salen,
256 /* do not resolve port# into service _name_ */
257 flags | NI_NUMERICSERV
261 #if ENABLE_FEATURE_IPV6
262 if (sa->sa_family == AF_INET6)
263 return xasprintf("[%s]:%s", host, serv);
265 /* For now we don't support anything else, so it has to be INET */
266 /*if (sa->sa_family == AF_INET)*/
267 return xasprintf("%s:%s", host, serv);
270 char* xmalloc_sockaddr2host(const struct sockaddr *sa, socklen_t salen)
272 return sockaddr2str(sa, salen, 0);
275 char* xmalloc_sockaddr2dotted(const struct sockaddr *sa, socklen_t salen)
277 return sockaddr2str(sa, salen, NI_NUMERICHOST);