Contents of /trunk/mkinitrd-magellan/busybox/libbb/xconnect.c
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Revision 816 -
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Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
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File size: 10379 byte(s)
Fri Apr 24 18:33:46 2009 UTC (15 years, 5 months ago) by niro
File MIME type: text/plain
File size: 10379 byte(s)
-updated to busybox-1.13.4
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Utility routines. |
4 | * |
5 | * Connect to host at port using address resolution from getaddrinfo |
6 | * |
7 | */ |
8 | |
9 | #include <netinet/in.h> |
10 | #include <net/if.h> |
11 | #include "libbb.h" |
12 | |
13 | void FAST_FUNC setsockopt_reuseaddr(int fd) |
14 | { |
15 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_1, sizeof(const_int_1)); |
16 | } |
17 | int FAST_FUNC setsockopt_broadcast(int fd) |
18 | { |
19 | return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1)); |
20 | } |
21 | int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface) |
22 | { |
23 | int r; |
24 | struct ifreq ifr; |
25 | strncpy(ifr.ifr_name, iface, IFNAMSIZ); |
26 | /* Actually, ifr_name is at offset 0, and in practice |
27 | * just giving char[IFNAMSIZ] instead of struct ifreq works too. |
28 | * But just in case it's not true on some obscure arch... */ |
29 | r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)); |
30 | if (r) |
31 | bb_perror_msg("can't bind to interface %s", iface); |
32 | return r; |
33 | } |
34 | |
35 | |
36 | void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen) |
37 | { |
38 | if (connect(s, s_addr, addrlen) < 0) { |
39 | if (ENABLE_FEATURE_CLEAN_UP) |
40 | close(s); |
41 | if (s_addr->sa_family == AF_INET) |
42 | bb_perror_msg_and_die("%s (%s)", |
43 | "cannot connect to remote host", |
44 | inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr)); |
45 | bb_perror_msg_and_die("cannot connect to remote host"); |
46 | } |
47 | } |
48 | |
49 | /* Return port number for a service. |
50 | * If "port" is a number use it as the port. |
51 | * If "port" is a name it is looked up in /etc/services, if it isnt found return |
52 | * default_port */ |
53 | unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned default_port) |
54 | { |
55 | unsigned port_nr = default_port; |
56 | if (port) { |
57 | int old_errno; |
58 | |
59 | /* Since this is a lib function, we're not allowed to reset errno to 0. |
60 | * Doing so could break an app that is deferring checking of errno. */ |
61 | old_errno = errno; |
62 | port_nr = bb_strtou(port, NULL, 10); |
63 | if (errno || port_nr > 65535) { |
64 | struct servent *tserv = getservbyname(port, protocol); |
65 | port_nr = default_port; |
66 | if (tserv) |
67 | port_nr = ntohs(tserv->s_port); |
68 | } |
69 | errno = old_errno; |
70 | } |
71 | return (uint16_t)port_nr; |
72 | } |
73 | |
74 | |
75 | /* "Old" networking API - only IPv4 */ |
76 | |
77 | /* |
78 | void FAST_FUNC bb_lookup_host(struct sockaddr_in *s_in, const char *host) |
79 | { |
80 | struct hostent *he; |
81 | |
82 | memset(s_in, 0, sizeof(struct sockaddr_in)); |
83 | s_in->sin_family = AF_INET; |
84 | he = xgethostbyname(host); |
85 | memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length); |
86 | } |
87 | |
88 | |
89 | int FAST_FUNC xconnect_tcp_v4(struct sockaddr_in *s_addr) |
90 | { |
91 | int s = xsocket(AF_INET, SOCK_STREAM, 0); |
92 | xconnect(s, (struct sockaddr*) s_addr, sizeof(*s_addr)); |
93 | return s; |
94 | } |
95 | */ |
96 | |
97 | /* "New" networking API */ |
98 | |
99 | |
100 | int FAST_FUNC get_nport(const struct sockaddr *sa) |
101 | { |
102 | #if ENABLE_FEATURE_IPV6 |
103 | if (sa->sa_family == AF_INET6) { |
104 | return ((struct sockaddr_in6*)sa)->sin6_port; |
105 | } |
106 | #endif |
107 | if (sa->sa_family == AF_INET) { |
108 | return ((struct sockaddr_in*)sa)->sin_port; |
109 | } |
110 | /* What? UNIX socket? IPX?? :) */ |
111 | return -1; |
112 | } |
113 | |
114 | void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port) |
115 | { |
116 | #if ENABLE_FEATURE_IPV6 |
117 | if (lsa->u.sa.sa_family == AF_INET6) { |
118 | lsa->u.sin6.sin6_port = port; |
119 | return; |
120 | } |
121 | #endif |
122 | if (lsa->u.sa.sa_family == AF_INET) { |
123 | lsa->u.sin.sin_port = port; |
124 | return; |
125 | } |
126 | /* What? UNIX socket? IPX?? :) */ |
127 | } |
128 | |
129 | /* We hijack this constant to mean something else */ |
130 | /* It doesn't hurt because we will remove this bit anyway */ |
131 | #define DIE_ON_ERROR AI_CANONNAME |
132 | |
133 | /* host: "1.2.3.4[:port]", "www.google.com[:port]" |
134 | * port: if neither of above specifies port # */ |
135 | static len_and_sockaddr* str2sockaddr( |
136 | const char *host, int port, |
137 | USE_FEATURE_IPV6(sa_family_t af,) |
138 | int ai_flags) |
139 | { |
140 | int rc; |
141 | len_and_sockaddr *r = NULL; |
142 | struct addrinfo *result = NULL; |
143 | struct addrinfo *used_res; |
144 | const char *org_host = host; /* only for error msg */ |
145 | const char *cp; |
146 | struct addrinfo hint; |
147 | |
148 | /* Ugly parsing of host:addr */ |
149 | if (ENABLE_FEATURE_IPV6 && host[0] == '[') { |
150 | /* Even uglier parsing of [xx]:nn */ |
151 | host++; |
152 | cp = strchr(host, ']'); |
153 | if (!cp || cp[1] != ':') { /* Malformed: must have [xx]:nn */ |
154 | bb_error_msg("bad address '%s'", org_host); |
155 | if (ai_flags & DIE_ON_ERROR) |
156 | xfunc_die(); |
157 | return NULL; |
158 | } |
159 | } else { |
160 | cp = strrchr(host, ':'); |
161 | if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) { |
162 | /* There is more than one ':' (e.g. "::1") */ |
163 | cp = NULL; /* it's not a port spec */ |
164 | } |
165 | } |
166 | if (cp) { /* points to ":" or "]:" */ |
167 | int sz = cp - host + 1; |
168 | host = safe_strncpy(alloca(sz), host, sz); |
169 | if (ENABLE_FEATURE_IPV6 && *cp != ':') |
170 | cp++; /* skip ']' */ |
171 | cp++; /* skip ':' */ |
172 | port = bb_strtou(cp, NULL, 10); |
173 | if (errno || (unsigned)port > 0xffff) { |
174 | bb_error_msg("bad port spec '%s'", org_host); |
175 | if (ai_flags & DIE_ON_ERROR) |
176 | xfunc_die(); |
177 | return NULL; |
178 | } |
179 | } |
180 | |
181 | memset(&hint, 0 , sizeof(hint)); |
182 | #if !ENABLE_FEATURE_IPV6 |
183 | hint.ai_family = AF_INET; /* do not try to find IPv6 */ |
184 | #else |
185 | hint.ai_family = af; |
186 | #endif |
187 | /* Needed. Or else we will get each address thrice (or more) |
188 | * for each possible socket type (tcp,udp,raw...): */ |
189 | hint.ai_socktype = SOCK_STREAM; |
190 | hint.ai_flags = ai_flags & ~DIE_ON_ERROR; |
191 | rc = getaddrinfo(host, NULL, &hint, &result); |
192 | if (rc || !result) { |
193 | bb_error_msg("bad address '%s'", org_host); |
194 | if (ai_flags & DIE_ON_ERROR) |
195 | xfunc_die(); |
196 | goto ret; |
197 | } |
198 | used_res = result; |
199 | #if ENABLE_FEATURE_PREFER_IPV4_ADDRESS |
200 | while (1) { |
201 | if (used_res->ai_family == AF_INET) |
202 | break; |
203 | used_res = used_res->ai_next; |
204 | if (!used_res) { |
205 | used_res = result; |
206 | break; |
207 | } |
208 | } |
209 | #endif |
210 | r = xmalloc(offsetof(len_and_sockaddr, u.sa) + used_res->ai_addrlen); |
211 | r->len = used_res->ai_addrlen; |
212 | memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen); |
213 | set_nport(r, htons(port)); |
214 | ret: |
215 | freeaddrinfo(result); |
216 | return r; |
217 | } |
218 | #if !ENABLE_FEATURE_IPV6 |
219 | #define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags) |
220 | #endif |
221 | |
222 | #if ENABLE_FEATURE_IPV6 |
223 | len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af) |
224 | { |
225 | return str2sockaddr(host, port, af, 0); |
226 | } |
227 | |
228 | len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af) |
229 | { |
230 | return str2sockaddr(host, port, af, DIE_ON_ERROR); |
231 | } |
232 | #endif |
233 | |
234 | len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port) |
235 | { |
236 | return str2sockaddr(host, port, AF_UNSPEC, 0); |
237 | } |
238 | |
239 | len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port) |
240 | { |
241 | return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR); |
242 | } |
243 | |
244 | len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port) |
245 | { |
246 | return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR); |
247 | } |
248 | |
249 | #undef xsocket_type |
250 | int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, USE_FEATURE_IPV6(int family,) int sock_type) |
251 | { |
252 | SKIP_FEATURE_IPV6(enum { family = AF_INET };) |
253 | len_and_sockaddr *lsa; |
254 | int fd; |
255 | int len; |
256 | |
257 | #if ENABLE_FEATURE_IPV6 |
258 | if (family == AF_UNSPEC) { |
259 | fd = socket(AF_INET6, sock_type, 0); |
260 | if (fd >= 0) { |
261 | family = AF_INET6; |
262 | goto done; |
263 | } |
264 | family = AF_INET; |
265 | } |
266 | #endif |
267 | fd = xsocket(family, sock_type, 0); |
268 | len = sizeof(struct sockaddr_in); |
269 | #if ENABLE_FEATURE_IPV6 |
270 | if (family == AF_INET6) { |
271 | done: |
272 | len = sizeof(struct sockaddr_in6); |
273 | } |
274 | #endif |
275 | lsa = xzalloc(offsetof(len_and_sockaddr, u.sa) + len); |
276 | lsa->len = len; |
277 | lsa->u.sa.sa_family = family; |
278 | *lsap = lsa; |
279 | return fd; |
280 | } |
281 | |
282 | int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap) |
283 | { |
284 | return xsocket_type(lsap, USE_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM); |
285 | } |
286 | |
287 | static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type) |
288 | { |
289 | int fd; |
290 | len_and_sockaddr *lsa; |
291 | |
292 | if (bindaddr && bindaddr[0]) { |
293 | lsa = xdotted2sockaddr(bindaddr, port); |
294 | /* user specified bind addr dictates family */ |
295 | fd = xsocket(lsa->u.sa.sa_family, sock_type, 0); |
296 | } else { |
297 | fd = xsocket_type(&lsa, USE_FEATURE_IPV6(AF_UNSPEC,) sock_type); |
298 | set_nport(lsa, htons(port)); |
299 | } |
300 | setsockopt_reuseaddr(fd); |
301 | xbind(fd, &lsa->u.sa, lsa->len); |
302 | free(lsa); |
303 | return fd; |
304 | } |
305 | |
306 | int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port) |
307 | { |
308 | return create_and_bind_or_die(bindaddr, port, SOCK_STREAM); |
309 | } |
310 | |
311 | int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port) |
312 | { |
313 | return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM); |
314 | } |
315 | |
316 | |
317 | int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port) |
318 | { |
319 | int fd; |
320 | len_and_sockaddr *lsa; |
321 | |
322 | lsa = xhost2sockaddr(peer, port); |
323 | fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0); |
324 | setsockopt_reuseaddr(fd); |
325 | xconnect(fd, &lsa->u.sa, lsa->len); |
326 | free(lsa); |
327 | return fd; |
328 | } |
329 | |
330 | int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa) |
331 | { |
332 | int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0); |
333 | xconnect(fd, &lsa->u.sa, lsa->len); |
334 | return fd; |
335 | } |
336 | |
337 | /* We hijack this constant to mean something else */ |
338 | /* It doesn't hurt because we will add this bit anyway */ |
339 | #define IGNORE_PORT NI_NUMERICSERV |
340 | static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags) |
341 | { |
342 | char host[128]; |
343 | char serv[16]; |
344 | int rc; |
345 | socklen_t salen; |
346 | |
347 | salen = LSA_SIZEOF_SA; |
348 | #if ENABLE_FEATURE_IPV6 |
349 | if (sa->sa_family == AF_INET) |
350 | salen = sizeof(struct sockaddr_in); |
351 | if (sa->sa_family == AF_INET6) |
352 | salen = sizeof(struct sockaddr_in6); |
353 | #endif |
354 | rc = getnameinfo(sa, salen, |
355 | host, sizeof(host), |
356 | /* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */ |
357 | serv, sizeof(serv), |
358 | /* do not resolve port# into service _name_ */ |
359 | flags | NI_NUMERICSERV |
360 | ); |
361 | if (rc) |
362 | return NULL; |
363 | if (flags & IGNORE_PORT) |
364 | return xstrdup(host); |
365 | #if ENABLE_FEATURE_IPV6 |
366 | if (sa->sa_family == AF_INET6) { |
367 | if (strchr(host, ':')) /* heh, it's not a resolved hostname */ |
368 | return xasprintf("[%s]:%s", host, serv); |
369 | /*return xasprintf("%s:%s", host, serv);*/ |
370 | /* - fall through instead */ |
371 | } |
372 | #endif |
373 | /* For now we don't support anything else, so it has to be INET */ |
374 | /*if (sa->sa_family == AF_INET)*/ |
375 | return xasprintf("%s:%s", host, serv); |
376 | /*return xstrdup(host);*/ |
377 | } |
378 | |
379 | char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa) |
380 | { |
381 | return sockaddr2str(sa, 0); |
382 | } |
383 | |
384 | char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa) |
385 | { |
386 | return sockaddr2str(sa, IGNORE_PORT); |
387 | } |
388 | |
389 | char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa) |
390 | { |
391 | return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT); |
392 | } |
393 | char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa) |
394 | { |
395 | return sockaddr2str(sa, NI_NUMERICHOST); |
396 | } |
397 | |
398 | char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa) |
399 | { |
400 | return sockaddr2str(sa, NI_NUMERICHOST | IGNORE_PORT); |
401 | } |