blob: 91c12f4d3c009bfd173c22dedac4f162cd80d1ad [file] [log] [blame]
Eric Andersen0b315862002-07-03 11:51:44 +00001/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
Eric Andersenaff114c2004-04-14 17:51:38 +00005 * Connect to host at port using address resolution from getaddrinfo
Eric Andersen0b315862002-07-03 11:51:44 +00006 *
7 */
8
Denis Vlasenko9de420c2007-01-10 09:28:01 +00009#include <netinet/in.h>
Eric Andersen0b315862002-07-03 11:51:44 +000010#include "libbb.h"
11
Denis Vlasenkoa27a11b2007-08-18 14:16:39 +000012void setsockopt_reuseaddr(int fd)
Denis Vlasenko48237b02006-11-22 23:22:06 +000013{
Denis Vlasenkoa27a11b2007-08-18 14:16:39 +000014 setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_1, sizeof(const_int_1));
Denis Vlasenko48237b02006-11-22 23:22:06 +000015}
16int setsockopt_broadcast(int fd)
17{
Denis Vlasenko703e2022007-01-22 14:12:08 +000018 return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
Denis Vlasenko48237b02006-11-22 23:22:06 +000019}
20
Denis Vlasenko9de420c2007-01-10 09:28:01 +000021void xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
Denis Vlasenkoc8717cd2006-11-22 16:10:39 +000022{
Denis Vlasenko9de420c2007-01-10 09:28:01 +000023 if (connect(s, s_addr, addrlen) < 0) {
24 if (ENABLE_FEATURE_CLEAN_UP)
25 close(s);
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");
Denis Vlasenkoc8717cd2006-11-22 16:10:39 +000031 }
Denis Vlasenkoc8717cd2006-11-22 16:10:39 +000032}
33
Denis Vlasenko5d687242007-01-12 20:59:31 +000034/* Return port number for a service.
Denis Vlasenko9de420c2007-01-10 09:28:01 +000035 * 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
37 * default_port */
38unsigned bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
39{
Denis Vlasenko6536a9b2007-01-12 10:35:23 +000040 unsigned port_nr = default_port;
Denis Vlasenko9de420c2007-01-10 09:28:01 +000041 if (port) {
42 int old_errno;
43
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. */
46 old_errno = errno;
47 port_nr = bb_strtou(port, NULL, 10);
48 if (errno || port_nr > 65535) {
49 struct servent *tserv = getservbyname(port, protocol);
Denis Vlasenko24182882007-01-13 21:05:38 +000050 port_nr = default_port;
Denis Vlasenko9de420c2007-01-10 09:28:01 +000051 if (tserv)
Denis Vlasenko6536a9b2007-01-12 10:35:23 +000052 port_nr = ntohs(tserv->s_port);
Denis Vlasenko9de420c2007-01-10 09:28:01 +000053 }
54 errno = old_errno;
55 }
Denis Vlasenko6536a9b2007-01-12 10:35:23 +000056 return (uint16_t)port_nr;
Denis Vlasenko9de420c2007-01-10 09:28:01 +000057}
58
59
60/* "Old" networking API - only IPv4 */
61
Denis Vlasenko85629f02007-01-22 09:36:41 +000062/*
Denis Vlasenko9de420c2007-01-10 09:28:01 +000063void bb_lookup_host(struct sockaddr_in *s_in, const char *host)
64{
65 struct hostent *he;
66
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);
71}
72
Denis Vlasenko85629f02007-01-22 09:36:41 +000073
Denis Vlasenko9de420c2007-01-10 09:28:01 +000074int xconnect_tcp_v4(struct sockaddr_in *s_addr)
75{
76 int s = xsocket(AF_INET, SOCK_STREAM, 0);
77 xconnect(s, (struct sockaddr*) s_addr, sizeof(*s_addr));
78 return s;
79}
Denis Vlasenko85629f02007-01-22 09:36:41 +000080*/
Denis Vlasenko9de420c2007-01-10 09:28:01 +000081
82/* "New" networking API */
83
84
Denis Vlasenko2856dab2007-04-01 01:18:20 +000085int get_nport(const struct sockaddr *sa)
Denis Vlasenko5d687242007-01-12 20:59:31 +000086{
87#if ENABLE_FEATURE_IPV6
Denis Vlasenko2856dab2007-04-01 01:18:20 +000088 if (sa->sa_family == AF_INET6) {
89 return ((struct sockaddr_in6*)sa)->sin6_port;
Denis Vlasenko5d687242007-01-12 20:59:31 +000090 }
91#endif
Denis Vlasenko2856dab2007-04-01 01:18:20 +000092 if (sa->sa_family == AF_INET) {
93 return ((struct sockaddr_in*)sa)->sin_port;
Denis Vlasenko5d687242007-01-12 20:59:31 +000094 }
Denis Vlasenko5d687242007-01-12 20:59:31 +000095 /* What? UNIX socket? IPX?? :) */
Denis Vlasenko85629f02007-01-22 09:36:41 +000096 return -1;
Denis Vlasenko5d687242007-01-12 20:59:31 +000097}
98
99void set_nport(len_and_sockaddr *lsa, unsigned port)
Denis Vlasenko8e9ccba2007-01-11 16:50:23 +0000100{
101#if ENABLE_FEATURE_IPV6
102 if (lsa->sa.sa_family == AF_INET6) {
103 lsa->sin6.sin6_port = port;
104 return;
105 }
106#endif
107 if (lsa->sa.sa_family == AF_INET) {
108 lsa->sin.sin_port = port;
109 return;
110 }
111 /* What? UNIX socket? IPX?? :) */
112}
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000113
Denis Vlasenko42823d52007-02-04 02:39:08 +0000114/* We hijack this constant to mean something else */
115/* It doesn't hurt because we will remove this bit anyway */
116#define DIE_ON_ERROR AI_CANONNAME
117
Denis Vlasenko85629f02007-01-22 09:36:41 +0000118/* host: "1.2.3.4[:port]", "www.google.com[:port]"
Denis Vlasenko42823d52007-02-04 02:39:08 +0000119 * port: if neither of above specifies port # */
Denis Vlasenko9adc6ce2007-01-22 22:45:27 +0000120static len_and_sockaddr* str2sockaddr(
121 const char *host, int port,
122USE_FEATURE_IPV6(sa_family_t af,)
123 int ai_flags)
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000124{
125 int rc;
Denis Vlasenko42823d52007-02-04 02:39:08 +0000126 len_and_sockaddr *r = NULL;
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000127 struct addrinfo *result = NULL;
Denis Vlasenko9d6c4692007-11-14 10:18:33 +0000128 struct addrinfo *used_res;
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000129 const char *org_host = host; /* only for error msg */
130 const char *cp;
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000131 struct addrinfo hint;
132
133 /* Ugly parsing of host:addr */
134 if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
135 host++;
136 cp = strchr(host, ']');
137 if (!cp || cp[1] != ':') /* Malformed: must have [xx]:nn */
138 bb_error_msg_and_die("bad address '%s'", org_host);
139 //return r; /* return NULL */
140 } else {
141 cp = strrchr(host, ':');
142 if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
143 /* There is more than one ':' (e.g. "::1") */
144 cp = NULL; /* it's not a port spec */
145 }
146 }
147 if (cp) {
Denis Vlasenkobbe51462007-01-10 20:19:56 +0000148 int sz = cp - host + 1;
149 host = safe_strncpy(alloca(sz), host, sz);
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000150 if (ENABLE_FEATURE_IPV6 && *cp != ':')
151 cp++; /* skip ']' */
152 cp++; /* skip ':' */
Denis Vlasenko8e9ccba2007-01-11 16:50:23 +0000153 port = xatou16(cp);
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000154 }
155
156 memset(&hint, 0 , sizeof(hint));
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000157#if !ENABLE_FEATURE_IPV6
158 hint.ai_family = AF_INET; /* do not try to find IPv6 */
Denis Vlasenko9adc6ce2007-01-22 22:45:27 +0000159#else
160 hint.ai_family = af;
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000161#endif
162 /* Needed. Or else we will get each address thrice (or more)
163 * for each possible socket type (tcp,udp,raw...): */
164 hint.ai_socktype = SOCK_STREAM;
Denis Vlasenko42823d52007-02-04 02:39:08 +0000165 hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
Denis Vlasenko8e9ccba2007-01-11 16:50:23 +0000166 rc = getaddrinfo(host, NULL, &hint, &result);
Denis Vlasenko42823d52007-02-04 02:39:08 +0000167 if (rc || !result) {
Denis Vlasenko5870ad92007-02-04 02:39:55 +0000168 bb_error_msg("bad address '%s'", org_host);
Denis Vlasenko42823d52007-02-04 02:39:08 +0000169 if (ai_flags & DIE_ON_ERROR)
Denis Vlasenko335b63d2007-04-10 21:38:30 +0000170 xfunc_die();
Denis Vlasenko42823d52007-02-04 02:39:08 +0000171 goto ret;
172 }
Denis Vlasenko9d6c4692007-11-14 10:18:33 +0000173 used_res = result;
174#if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
175 while (1) {
176 if (used_res->ai_family == AF_INET)
177 break;
178 used_res = used_res->ai_next;
179 if (!used_res) {
180 used_res = result;
181 break;
182 }
183 }
184#endif
185 r = xmalloc(offsetof(len_and_sockaddr, sa) + used_res->ai_addrlen);
186 r->len = used_res->ai_addrlen;
187 memcpy(&r->sa, used_res->ai_addr, used_res->ai_addrlen);
Denis Vlasenko5d687242007-01-12 20:59:31 +0000188 set_nport(r, htons(port));
Denis Vlasenko42823d52007-02-04 02:39:08 +0000189 ret:
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000190 freeaddrinfo(result);
191 return r;
192}
Denis Vlasenko9adc6ce2007-01-22 22:45:27 +0000193#if !ENABLE_FEATURE_IPV6
194#define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
195#endif
196
197#if ENABLE_FEATURE_IPV6
Denis Vlasenkoe9913032007-02-04 02:41:57 +0000198len_and_sockaddr* host_and_af2sockaddr(const char *host, int port, sa_family_t af)
199{
200 return str2sockaddr(host, port, af, 0);
201}
202
Denis Vlasenko42823d52007-02-04 02:39:08 +0000203len_and_sockaddr* xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
Denis Vlasenko9adc6ce2007-01-22 22:45:27 +0000204{
Denis Vlasenko42823d52007-02-04 02:39:08 +0000205 return str2sockaddr(host, port, af, DIE_ON_ERROR);
Denis Vlasenko9adc6ce2007-01-22 22:45:27 +0000206}
207#endif
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000208
Denis Vlasenko5870ad92007-02-04 02:39:55 +0000209len_and_sockaddr* host2sockaddr(const char *host, int port)
210{
211 return str2sockaddr(host, port, AF_UNSPEC, 0);
212}
213
Denis Vlasenko42823d52007-02-04 02:39:08 +0000214len_and_sockaddr* xhost2sockaddr(const char *host, int port)
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000215{
Denis Vlasenko42823d52007-02-04 02:39:08 +0000216 return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000217}
218
Denis Vlasenko9ca26d32007-02-09 17:32:16 +0000219len_and_sockaddr* xdotted2sockaddr(const char *host, int port)
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000220{
Denis Vlasenko42823d52007-02-04 02:39:08 +0000221 return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000222}
223
Denis Vlasenko5c51a7c2007-06-05 20:08:11 +0000224int xsocket_type(len_and_sockaddr **lsap, USE_FEATURE_IPV6(int family,) int sock_type)
Denis Vlasenkoc8717cd2006-11-22 16:10:39 +0000225{
Denis Vlasenko5c51a7c2007-06-05 20:08:11 +0000226 SKIP_FEATURE_IPV6(enum { family = AF_INET };)
Denis Vlasenko5d687242007-01-12 20:59:31 +0000227 len_and_sockaddr *lsa;
Denis Vlasenkoc8717cd2006-11-22 16:10:39 +0000228 int fd;
Denis Vlasenko5c51a7c2007-06-05 20:08:11 +0000229 int len;
Denis Vlasenko5d687242007-01-12 20:59:31 +0000230
Denis Vlasenkoc8717cd2006-11-22 16:10:39 +0000231#if ENABLE_FEATURE_IPV6
Denis Vlasenko5c51a7c2007-06-05 20:08:11 +0000232 if (family == AF_UNSPEC) {
233 fd = socket(AF_INET6, sock_type, 0);
234 if (fd >= 0) {
235 family = AF_INET6;
236 goto done;
237 }
238 family = AF_INET;
Denis Vlasenko5d687242007-01-12 20:59:31 +0000239 }
Denis Vlasenko5c51a7c2007-06-05 20:08:11 +0000240#endif
241 fd = xsocket(family, sock_type, 0);
242 len = sizeof(struct sockaddr_in);
243#if ENABLE_FEATURE_IPV6
244 if (family == AF_INET6) {
245 done:
246 len = sizeof(struct sockaddr_in6);
247 }
248#endif
Denis Vlasenko5d687242007-01-12 20:59:31 +0000249 lsa = xzalloc(offsetof(len_and_sockaddr, sa) + len);
250 lsa->len = len;
251 lsa->sa.sa_family = family;
252 *lsap = lsa;
Denis Vlasenkoc8717cd2006-11-22 16:10:39 +0000253 return fd;
254}
255
Denis Vlasenko729bd9e2007-04-02 12:37:28 +0000256int xsocket_stream(len_and_sockaddr **lsap)
257{
Denis Vlasenko5c51a7c2007-06-05 20:08:11 +0000258 return xsocket_type(lsap, USE_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
Denis Vlasenko729bd9e2007-04-02 12:37:28 +0000259}
260
261static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
Denis Vlasenkoc8717cd2006-11-22 16:10:39 +0000262{
Denis Vlasenkoc8717cd2006-11-22 16:10:39 +0000263 int fd;
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000264 len_and_sockaddr *lsa;
Denis Vlasenkoc8717cd2006-11-22 16:10:39 +0000265
Denis Vlasenkobbe51462007-01-10 20:19:56 +0000266 if (bindaddr && bindaddr[0]) {
Denis Vlasenko42823d52007-02-04 02:39:08 +0000267 lsa = xdotted2sockaddr(bindaddr, port);
Denis Vlasenkoc8717cd2006-11-22 16:10:39 +0000268 /* user specified bind addr dictates family */
Denis Vlasenko729bd9e2007-04-02 12:37:28 +0000269 fd = xsocket(lsa->sa.sa_family, sock_type, 0);
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000270 } else {
Denis Vlasenko5c51a7c2007-06-05 20:08:11 +0000271 fd = xsocket_type(&lsa, USE_FEATURE_IPV6(AF_UNSPEC,) sock_type);
Denis Vlasenko24182882007-01-13 21:05:38 +0000272 set_nport(lsa, htons(port));
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000273 }
Denis Vlasenko48237b02006-11-22 23:22:06 +0000274 setsockopt_reuseaddr(fd);
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000275 xbind(fd, &lsa->sa, lsa->len);
276 free(lsa);
277 return fd;
278}
Denis Vlasenkoc8717cd2006-11-22 16:10:39 +0000279
Denis Vlasenko729bd9e2007-04-02 12:37:28 +0000280int create_and_bind_stream_or_die(const char *bindaddr, int port)
281{
282 return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
283}
284
285int create_and_bind_dgram_or_die(const char *bindaddr, int port)
286{
287 return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
288}
289
290
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000291int create_and_connect_stream_or_die(const char *peer, int port)
292{
293 int fd;
294 len_and_sockaddr *lsa;
Denis Vlasenkoc8717cd2006-11-22 16:10:39 +0000295
Denis Vlasenko42823d52007-02-04 02:39:08 +0000296 lsa = xhost2sockaddr(peer, port);
Denis Vlasenko9de420c2007-01-10 09:28:01 +0000297 fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
298 setsockopt_reuseaddr(fd);
299 xconnect(fd, &lsa->sa, lsa->len);
300 free(lsa);
Denis Vlasenkoc8717cd2006-11-22 16:10:39 +0000301 return fd;
302}
Denis Vlasenko8e9ccba2007-01-11 16:50:23 +0000303
304int xconnect_stream(const len_and_sockaddr *lsa)
305{
306 int fd = xsocket(lsa->sa.sa_family, SOCK_STREAM, 0);
307 xconnect(fd, &lsa->sa, lsa->len);
308 return fd;
309}
310
Denis Vlasenko448f0242007-01-22 22:43:05 +0000311/* We hijack this constant to mean something else */
312/* It doesn't hurt because we will add this bit anyway */
313#define IGNORE_PORT NI_NUMERICSERV
Denis Vlasenkoa27a11b2007-08-18 14:16:39 +0000314static char* sockaddr2str(const struct sockaddr *sa, int flags)
Denis Vlasenko8e9ccba2007-01-11 16:50:23 +0000315{
316 char host[128];
317 char serv[16];
Denis Vlasenkoa27a11b2007-08-18 14:16:39 +0000318 int rc;
319 socklen_t salen;
320
321 salen = LSA_SIZEOF_SA;
322#if ENABLE_FEATURE_IPV6
323 if (sa->sa_family == AF_INET)
324 salen = sizeof(struct sockaddr_in);
325 if (sa->sa_family == AF_INET6)
326 salen = sizeof(struct sockaddr_in6);
327#endif
328 rc = getnameinfo(sa, salen,
Denis Vlasenko8e9ccba2007-01-11 16:50:23 +0000329 host, sizeof(host),
Denis Vlasenko448f0242007-01-22 22:43:05 +0000330 /* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
Denis Vlasenko8e9ccba2007-01-11 16:50:23 +0000331 serv, sizeof(serv),
Denis Vlasenko85629f02007-01-22 09:36:41 +0000332 /* do not resolve port# into service _name_ */
333 flags | NI_NUMERICSERV
Denis Vlasenko8e9ccba2007-01-11 16:50:23 +0000334 );
Denis Vlasenko85629f02007-01-22 09:36:41 +0000335 if (rc)
336 return NULL;
Denis Vlasenko448f0242007-01-22 22:43:05 +0000337 if (flags & IGNORE_PORT)
338 return xstrdup(host);
Denis Vlasenko85629f02007-01-22 09:36:41 +0000339#if ENABLE_FEATURE_IPV6
Denis Vlasenko448f0242007-01-22 22:43:05 +0000340 if (sa->sa_family == AF_INET6) {
341 if (strchr(host, ':')) /* heh, it's not a resolved hostname */
342 return xasprintf("[%s]:%s", host, serv);
343 /*return xasprintf("%s:%s", host, serv);*/
344 /* - fall through instead */
345 }
Denis Vlasenko85629f02007-01-22 09:36:41 +0000346#endif
347 /* For now we don't support anything else, so it has to be INET */
348 /*if (sa->sa_family == AF_INET)*/
349 return xasprintf("%s:%s", host, serv);
Denis Vlasenko448f0242007-01-22 22:43:05 +0000350 /*return xstrdup(host);*/
Denis Vlasenko8e9ccba2007-01-11 16:50:23 +0000351}
352
Denis Vlasenkoa27a11b2007-08-18 14:16:39 +0000353char* xmalloc_sockaddr2host(const struct sockaddr *sa)
Denis Vlasenko8e9ccba2007-01-11 16:50:23 +0000354{
Denis Vlasenkoa27a11b2007-08-18 14:16:39 +0000355 return sockaddr2str(sa, 0);
Denis Vlasenko8e9ccba2007-01-11 16:50:23 +0000356}
357
Denis Vlasenkoa27a11b2007-08-18 14:16:39 +0000358char* xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
Denis Vlasenko9adc6ce2007-01-22 22:45:27 +0000359{
Denis Vlasenkoa27a11b2007-08-18 14:16:39 +0000360 return sockaddr2str(sa, IGNORE_PORT);
Denis Vlasenko9adc6ce2007-01-22 22:45:27 +0000361}
362
Denis Vlasenkoa27a11b2007-08-18 14:16:39 +0000363char* xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
Denis Vlasenko448f0242007-01-22 22:43:05 +0000364{
Denis Vlasenkoa27a11b2007-08-18 14:16:39 +0000365 return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
Denis Vlasenko448f0242007-01-22 22:43:05 +0000366}
Denis Vlasenkoa27a11b2007-08-18 14:16:39 +0000367char* xmalloc_sockaddr2dotted(const struct sockaddr *sa)
Denis Vlasenko8e9ccba2007-01-11 16:50:23 +0000368{
Denis Vlasenkoa27a11b2007-08-18 14:16:39 +0000369 return sockaddr2str(sa, NI_NUMERICHOST);
Denis Vlasenko8e9ccba2007-01-11 16:50:23 +0000370}
Denis Vlasenko448f0242007-01-22 22:43:05 +0000371
Denis Vlasenkoa27a11b2007-08-18 14:16:39 +0000372char* xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
Denis Vlasenko448f0242007-01-22 22:43:05 +0000373{
Denis Vlasenkoa27a11b2007-08-18 14:16:39 +0000374 return sockaddr2str(sa, NI_NUMERICHOST | IGNORE_PORT);
Denis Vlasenko448f0242007-01-22 22:43:05 +0000375}