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);
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);
73 int xconnect_tcp_v4(struct sockaddr_in *s_addr)
75 int s = xsocket(AF_INET, SOCK_STREAM, 0);
76 xconnect(s, (struct sockaddr*) s_addr, sizeof(*s_addr));
81 /* "New" networking API */
84 int get_nport(len_and_sockaddr *lsa)
86 #if ENABLE_FEATURE_IPV6
87 if (lsa->sa.sa_family == AF_INET6) {
88 return lsa->sin6.sin6_port;
91 if (lsa->sa.sa_family == AF_INET) {
92 return lsa->sin.sin_port;
95 /* What? UNIX socket? IPX?? :) */
98 void set_nport(len_and_sockaddr *lsa, unsigned port)
100 #if ENABLE_FEATURE_IPV6
101 if (lsa->sa.sa_family == AF_INET6) {
102 lsa->sin6.sin6_port = port;
106 if (lsa->sa.sa_family == AF_INET) {
107 lsa->sin.sin_port = port;
110 /* What? UNIX socket? IPX?? :) */
113 /* peer: "1.2.3.4[:port]", "www.google.com[:port]"
114 * port: if neither of above specifies port #
116 static len_and_sockaddr* str2sockaddr(const char *host, int port, int ai_flags)
119 len_and_sockaddr *r; // = NULL;
120 struct addrinfo *result = NULL;
121 const char *org_host = host; /* only for error msg */
123 struct addrinfo hint;
125 /* Ugly parsing of host:addr */
126 if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
128 cp = strchr(host, ']');
129 if (!cp || cp[1] != ':') /* Malformed: must have [xx]:nn */
130 bb_error_msg_and_die("bad address '%s'", org_host);
131 //return r; /* return NULL */
133 cp = strrchr(host, ':');
134 if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
135 /* There is more than one ':' (e.g. "::1") */
136 cp = NULL; /* it's not a port spec */
140 int sz = cp - host + 1;
141 host = safe_strncpy(alloca(sz), host, sz);
142 if (ENABLE_FEATURE_IPV6 && *cp != ':')
148 memset(&hint, 0 , sizeof(hint));
149 /* hint.ai_family = AF_UNSPEC; - zero anyway */
150 #if !ENABLE_FEATURE_IPV6
151 hint.ai_family = AF_INET; /* do not try to find IPv6 */
153 /* Needed. Or else we will get each address thrice (or more)
154 * for each possible socket type (tcp,udp,raw...): */
155 hint.ai_socktype = SOCK_STREAM;
156 hint.ai_flags = ai_flags;
157 rc = getaddrinfo(host, NULL, &hint, &result);
159 bb_error_msg_and_die("bad address '%s'", org_host);
160 r = xmalloc(offsetof(len_and_sockaddr, sa) + result->ai_addrlen);
161 r->len = result->ai_addrlen;
162 memcpy(&r->sa, result->ai_addr, result->ai_addrlen);
163 set_nport(r, htons(port));
164 freeaddrinfo(result);
168 len_and_sockaddr* host2sockaddr(const char *host, int port)
170 return str2sockaddr(host, port, 0);
173 static len_and_sockaddr* dotted2sockaddr(const char *host, int port)
175 return str2sockaddr(host, port, NI_NUMERICHOST);
178 int xsocket_stream(len_and_sockaddr **lsap)
180 len_and_sockaddr *lsa;
182 int len = sizeof(struct sockaddr_in);
183 int family = AF_INET;
185 #if ENABLE_FEATURE_IPV6
186 fd = socket(AF_INET6, SOCK_STREAM, 0);
188 len = sizeof(struct sockaddr_in6);
193 fd = xsocket(AF_INET, SOCK_STREAM, 0);
195 lsa = xzalloc(offsetof(len_and_sockaddr, sa) + len);
197 lsa->sa.sa_family = family;
202 int create_and_bind_stream_or_die(const char *bindaddr, int port)
205 len_and_sockaddr *lsa;
207 if (bindaddr && bindaddr[0]) {
208 lsa = dotted2sockaddr(bindaddr, port);
209 /* currently NULL check is in str2sockaddr */
211 // bb_error_msg_and_die("bad address '%s'", bindaddr);
212 /* user specified bind addr dictates family */
213 fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
215 fd = xsocket_stream(&lsa);
217 setsockopt_reuseaddr(fd);
218 xbind(fd, &lsa->sa, lsa->len);
223 int create_and_connect_stream_or_die(const char *peer, int port)
226 len_and_sockaddr *lsa;
228 lsa = host2sockaddr(peer, port);
229 /* currently NULL check is in str2sockaddr */
231 // bb_error_msg_and_die("bad address '%s'", peer);
232 fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
233 setsockopt_reuseaddr(fd);
234 xconnect(fd, &lsa->sa, lsa->len);
239 int xconnect_stream(const len_and_sockaddr *lsa)
241 int fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
242 xconnect(fd, &lsa->sa, lsa->len);
246 static char* sockaddr2str(const struct sockaddr *sa, socklen_t salen, int flags)
250 int rc = getnameinfo(sa, salen,
253 flags | NI_NUMERICSERV /* do not resolve port# */
256 // We probably need to use [%s]:%s for IPv6...
257 return xasprintf("%s:%s", host, serv);
260 char* xmalloc_sockaddr2host(const struct sockaddr *sa, socklen_t salen)
262 return sockaddr2str(sa, salen, 0);
265 char* xmalloc_sockaddr2dotted(const struct sockaddr *sa, socklen_t salen)
267 return sockaddr2str(sa, salen, NI_NUMERICHOST);