1 | //socket.c: |
---|
2 | |
---|
3 | #include "libroar.h" |
---|
4 | |
---|
5 | #define MODE_LISTEN ROAR_SOCKET_MODE_LISTEN |
---|
6 | #define MODE_CONNECT ROAR_SOCKET_MODE_CONNECT |
---|
7 | |
---|
8 | int roar_socket_new_tcp (void) { |
---|
9 | int fh; |
---|
10 | int opt = IPTOS_LOWDELAY; |
---|
11 | |
---|
12 | fh = socket(PF_INET, SOCK_STREAM, 0); |
---|
13 | |
---|
14 | setsockopt(fh, IPPROTO_IP, IP_TOS, &opt, sizeof(int)); |
---|
15 | |
---|
16 | return fh; |
---|
17 | } |
---|
18 | |
---|
19 | int roar_socket_new_udp (void) { |
---|
20 | int fh; |
---|
21 | int opt = IPTOS_LOWDELAY; |
---|
22 | |
---|
23 | fh = socket(PF_INET, SOCK_DGRAM, 0); |
---|
24 | |
---|
25 | setsockopt(fh, IPPROTO_IP, IP_TOS, &opt, sizeof(int)); |
---|
26 | |
---|
27 | return fh; |
---|
28 | } |
---|
29 | |
---|
30 | int roar_socket_new_tcp6 (void) { |
---|
31 | #ifdef PF_INET6 |
---|
32 | int fh; |
---|
33 | int opt = IPTOS_LOWDELAY; |
---|
34 | |
---|
35 | fh = socket(PF_INET6, SOCK_STREAM, 0); |
---|
36 | |
---|
37 | setsockopt(fh, IPPROTO_IP, IP_TOS, &opt, sizeof(int)); |
---|
38 | |
---|
39 | return fh; |
---|
40 | #else |
---|
41 | return -1; |
---|
42 | #endif |
---|
43 | } |
---|
44 | |
---|
45 | int roar_socket_new_udp6 (void) { |
---|
46 | #ifdef PF_INET6 |
---|
47 | int fh; |
---|
48 | int opt = IPTOS_LOWDELAY; |
---|
49 | |
---|
50 | fh = socket(PF_INET6, SOCK_DGRAM, 0); |
---|
51 | |
---|
52 | setsockopt(fh, IPPROTO_IP, IP_TOS, &opt, sizeof(int)); |
---|
53 | |
---|
54 | return fh; |
---|
55 | #else |
---|
56 | return -1; |
---|
57 | #endif |
---|
58 | } |
---|
59 | |
---|
60 | int roar_socket_new_unix (void) { |
---|
61 | int fh; |
---|
62 | #ifdef SO_PEERCRED |
---|
63 | int opt = 1; |
---|
64 | #endif |
---|
65 | |
---|
66 | fh = socket(AF_UNIX, SOCK_STREAM, 0); |
---|
67 | |
---|
68 | #ifdef SO_PEERCRED |
---|
69 | setsockopt(fh, SOL_SOCKET, SO_PASSCRED, &opt, sizeof(int)); |
---|
70 | #endif |
---|
71 | |
---|
72 | return fh; |
---|
73 | } |
---|
74 | |
---|
75 | int roar_socket_new_decnet_seqpacket (void) { |
---|
76 | #ifdef ROAR_HAVE_LIBDNET |
---|
77 | int fh; |
---|
78 | |
---|
79 | fh = socket(AF_DECnet, SOCK_SEQPACKET, DNPROTO_NSP); |
---|
80 | |
---|
81 | return fh; |
---|
82 | #else |
---|
83 | return -1; |
---|
84 | #endif |
---|
85 | } |
---|
86 | |
---|
87 | |
---|
88 | int roar_socket_new_decnet_stream (void) { |
---|
89 | #ifdef ROAR_HAVE_LIBDNET |
---|
90 | int fh; |
---|
91 | |
---|
92 | fh = socket(AF_DECnet, SOCK_STREAM, DNPROTO_NSP); |
---|
93 | |
---|
94 | return fh; |
---|
95 | #else |
---|
96 | return -1; |
---|
97 | #endif |
---|
98 | } |
---|
99 | |
---|
100 | |
---|
101 | int roar_socket_nonblock(int fh, int state) { |
---|
102 | int flags; |
---|
103 | |
---|
104 | if ( (flags = fcntl(fh, F_GETFL, 0)) == -1 ) { |
---|
105 | ROAR_ERR("roar_socket_nonblock(fh=%i, state=%i): Can not read flags: %s", fh, state, strerror(errno)); |
---|
106 | ROAR_DBG("roar_socket_nonblock(fh=%i, state=%i) = -1", fh, state); |
---|
107 | return -1; |
---|
108 | } |
---|
109 | |
---|
110 | flags |= O_NONBLOCK; |
---|
111 | |
---|
112 | if ( state == ROAR_SOCKET_BLOCK ) |
---|
113 | flags -= O_NONBLOCK; |
---|
114 | |
---|
115 | if ( fcntl(fh, F_SETFL, flags) == -1 ) { |
---|
116 | ROAR_ERR("roar_socket_nonblock(fh=%i, state=%i): Can not set flags: %s", fh, state, strerror(errno)); |
---|
117 | ROAR_DBG("roar_socket_nonblock(fh=%i, state=%i) = -1", fh, state); |
---|
118 | return -1; |
---|
119 | } |
---|
120 | |
---|
121 | ROAR_DBG("roar_socket_nonblock(fh=%i, state=%i) = 0", fh, state); |
---|
122 | return 0; |
---|
123 | } |
---|
124 | |
---|
125 | int roar_socket_dup_udp_local_end (int fh) { |
---|
126 | int n = -1; |
---|
127 | int flags = -1; |
---|
128 | struct sockaddr_in socket_addr; |
---|
129 | socklen_t len = sizeof(struct sockaddr_in); |
---|
130 | |
---|
131 | if ( (flags = fcntl(fh, F_GETFL, 0)) == -1 ) { |
---|
132 | ROAR_WARN("roar_socket_dup_udp_local_end(fh=%i): Can not read flags: %s", fh, strerror(errno)); |
---|
133 | } |
---|
134 | |
---|
135 | if ( getsockname(fh, (struct sockaddr *)&socket_addr, &len) == -1 ) { |
---|
136 | return -1; |
---|
137 | } |
---|
138 | |
---|
139 | if ( socket_addr.sin_family != AF_INET ) { |
---|
140 | return -1; |
---|
141 | } |
---|
142 | |
---|
143 | n = roar_socket_new_udp(); |
---|
144 | |
---|
145 | if ( n == -1 ) |
---|
146 | return -1; |
---|
147 | |
---|
148 | // if ( mode_func(fh, (struct sockaddr *)&socket_addr, sizeof(struct sockaddr_in)) == -1 ) { |
---|
149 | if ( bind(n, (struct sockaddr *)&socket_addr, len) == -1 ) { |
---|
150 | close(n); |
---|
151 | return -1; |
---|
152 | } |
---|
153 | |
---|
154 | if ( flags != -1 ) { |
---|
155 | if ( fcntl(fh, F_SETFL, flags) == -1 ) { |
---|
156 | ROAR_WARN("roar_socket_dup_udp_local_end(fh=%i): Can not set flags: %s", fh, strerror(errno)); |
---|
157 | return -1; |
---|
158 | } |
---|
159 | } |
---|
160 | |
---|
161 | |
---|
162 | return n; |
---|
163 | } |
---|
164 | |
---|
165 | int roar_socket_listen (int type, char * host, int port) { |
---|
166 | return roar_socket_open(MODE_LISTEN, type, host, port); |
---|
167 | } |
---|
168 | |
---|
169 | int roar_socket_connect (char * host, int port) { |
---|
170 | char * proxy_type = getenv("ROAR_PROXY"); |
---|
171 | |
---|
172 | if ( proxy_type == NULL || strcmp(proxy_type, "") == 0 ) { |
---|
173 | return roar_socket_open(MODE_CONNECT, ROAR_SOCKET_TYPE_UNKNOWN, host, port); |
---|
174 | } else { |
---|
175 | return roar_socket_open_proxy(MODE_CONNECT, ROAR_SOCKET_TYPE_UNKNOWN, host, port, proxy_type); |
---|
176 | } |
---|
177 | } |
---|
178 | |
---|
179 | |
---|
180 | int roar_socket_listen_decnet (char * object, int num) { |
---|
181 | #ifdef ROAR_HAVE_LIBDNET |
---|
182 | int fh = roar_socket_new_decnet_stream(); |
---|
183 | struct sockaddr_dn bind_sockaddr; |
---|
184 | |
---|
185 | if ( fh == -1 ) |
---|
186 | return -1; |
---|
187 | |
---|
188 | if ( !*object ) |
---|
189 | object = NULL; |
---|
190 | |
---|
191 | if ( (object && num) || (!*object && !num) ) { |
---|
192 | ROAR_WARN("roar_socket_listen_decnet(object='%s', num=%i): illegal address!", object, num); |
---|
193 | close(fh); |
---|
194 | return -1; |
---|
195 | } |
---|
196 | |
---|
197 | memset((void*)&bind_sockaddr, 0, sizeof(struct sockaddr_dn)); |
---|
198 | |
---|
199 | bind_sockaddr.sdn_family = AF_DECnet; |
---|
200 | bind_sockaddr.sdn_flags = 0; |
---|
201 | bind_sockaddr.sdn_objnum = num; |
---|
202 | |
---|
203 | if ( num ) { |
---|
204 | bind_sockaddr.sdn_objnamel = 0; |
---|
205 | } else { |
---|
206 | bind_sockaddr.sdn_objnamel = ROAR_dn_htons(strlen(object)); |
---|
207 | strcpy((char*)bind_sockaddr.sdn_objname, object); // FIXME: shouldn't we use strncpy()? |
---|
208 | } |
---|
209 | |
---|
210 | if ( bind(fh, (struct sockaddr *) &bind_sockaddr, sizeof(bind_sockaddr)) == -1 ) { |
---|
211 | close(fh); |
---|
212 | return -1; |
---|
213 | } |
---|
214 | |
---|
215 | if ( listen(fh, 8) == -1 ) { |
---|
216 | close(fh); |
---|
217 | return -1; |
---|
218 | } |
---|
219 | |
---|
220 | return fh; |
---|
221 | #else |
---|
222 | return -1; |
---|
223 | #endif |
---|
224 | } |
---|
225 | |
---|
226 | int roar_socket_open (int mode, int type, char * host, int port) { |
---|
227 | // int type = ROAR_SOCKET_TYPE_INET; |
---|
228 | int fh; |
---|
229 | union { |
---|
230 | struct sockaddr_in in; |
---|
231 | struct sockaddr_un un; |
---|
232 | } socket_addr; |
---|
233 | struct hostent * he; |
---|
234 | //unsigned int host_div = 0; |
---|
235 | int (*mode_func)(int sockfd, const struct sockaddr *serv_addr, socklen_t addrlen) = connect; // default is to connect |
---|
236 | #ifdef ROAR_HAVE_LIBDNET |
---|
237 | char obj[80]; |
---|
238 | char * del; |
---|
239 | #endif |
---|
240 | |
---|
241 | if ( mode == MODE_LISTEN ) |
---|
242 | mode_func = bind; |
---|
243 | |
---|
244 | if ( type == ROAR_SOCKET_TYPE_UNKNOWN ) { |
---|
245 | type = ROAR_SOCKET_TYPE_INET; |
---|
246 | if ( *host == '/' ) { |
---|
247 | type = ROAR_SOCKET_TYPE_UNIX; |
---|
248 | } else if ( strcmp(host, "+fork") == 0 ) { |
---|
249 | type = ROAR_SOCKET_TYPE_FORK; |
---|
250 | } else if ( strstr(host, "::") != NULL ) { |
---|
251 | type = ROAR_SOCKET_TYPE_DECNET; |
---|
252 | } |
---|
253 | } |
---|
254 | |
---|
255 | |
---|
256 | ROAR_DBG("roar_socket_open(*): type=%s, host='%s', port=%i", |
---|
257 | type == ROAR_SOCKET_TYPE_UNIX ? "UNIX" : "INET", host, port); |
---|
258 | |
---|
259 | if ( type == ROAR_SOCKET_TYPE_DECNET ) { |
---|
260 | #ifdef ROAR_HAVE_LIBDNET |
---|
261 | ROAR_DBG("roar_socket_open(*): hostname for DECnet: host(%p)=%s", host, host); |
---|
262 | del = strstr(host, "::"); |
---|
263 | ROAR_DBG("roar_socket_open(*): hostname for DECnet: del(%p)=%s", del, del); |
---|
264 | |
---|
265 | if ( del == NULL ) { |
---|
266 | ROAR_WARN("roar_socket_open(*): invalid hostname for DECnet: %s", host); |
---|
267 | return -1; |
---|
268 | } |
---|
269 | |
---|
270 | *del = 0; |
---|
271 | |
---|
272 | if ( *(del+2) == '#' ) { // assume we have node::#num |
---|
273 | port = atoi(del+2); |
---|
274 | } |
---|
275 | |
---|
276 | if ( port ) { |
---|
277 | sprintf(obj, "%i", port); // no need for snprintf() as dec(port) is smaller than obj[] |
---|
278 | } else { |
---|
279 | *obj = 0; |
---|
280 | strncat(obj, del+2, 79); |
---|
281 | } |
---|
282 | |
---|
283 | if ( mode == MODE_LISTEN ) { |
---|
284 | fh = roar_socket_listen_decnet(obj, port); |
---|
285 | *del = ':'; |
---|
286 | return fh; |
---|
287 | // return -1; // listen sockets on DECnet are not supportet at the moment |
---|
288 | } else { |
---|
289 | // There is nothing wrong in this case to use dnet_conn() so we do. |
---|
290 | fh = dnet_conn(host, obj, SOCK_STREAM, 0 ,0 ,0 , 0); |
---|
291 | *del = ':'; |
---|
292 | return fh; |
---|
293 | #else |
---|
294 | return -1; // no decnet support |
---|
295 | #endif |
---|
296 | } |
---|
297 | } |
---|
298 | |
---|
299 | memset(&socket_addr, 0, sizeof(socket_addr)); |
---|
300 | memset(&he, 0, sizeof(he)); // FIXME: we have a valid pointer in here???? |
---|
301 | |
---|
302 | |
---|
303 | if ( type == ROAR_SOCKET_TYPE_INET ) { |
---|
304 | |
---|
305 | if ( (he = gethostbyname(host)) == NULL ) { |
---|
306 | ROAR_ERR("roar_socket_open(*): Can\'t resolve host name '%s'", |
---|
307 | host); |
---|
308 | return -1; |
---|
309 | } |
---|
310 | |
---|
311 | memcpy((struct in_addr *)&socket_addr.in.sin_addr, he->h_addr, sizeof(struct in_addr)); |
---|
312 | |
---|
313 | /* set the connect information */ |
---|
314 | socket_addr.in.sin_family = AF_INET; |
---|
315 | socket_addr.in.sin_port = htons( port ); |
---|
316 | |
---|
317 | fh = roar_socket_new_tcp(); |
---|
318 | |
---|
319 | if ( mode_func(fh, (struct sockaddr *)&socket_addr.in, sizeof(struct sockaddr_in)) == -1 ) { |
---|
320 | ROAR_DBG("roar_socket_open(*): Can not connect/bind: %s", strerror(errno)); |
---|
321 | close(fh); |
---|
322 | return -1; |
---|
323 | } |
---|
324 | // hey! we have a socket... |
---|
325 | } else if ( type == ROAR_SOCKET_TYPE_UNIX ) { |
---|
326 | socket_addr.un.sun_family = AF_UNIX; |
---|
327 | strncpy(socket_addr.un.sun_path, host, sizeof(socket_addr.un.sun_path) - 1); |
---|
328 | |
---|
329 | fh = roar_socket_new_unix(); |
---|
330 | |
---|
331 | if ( mode_func(fh, (struct sockaddr *)&socket_addr.un, sizeof(struct sockaddr_un)) == -1 ) { |
---|
332 | ROAR_DBG("roar_socket_open(*): Can not connect/bind: %s", strerror(errno)); |
---|
333 | close(fh); |
---|
334 | return -1; |
---|
335 | } |
---|
336 | } else if ( type == ROAR_SOCKET_TYPE_FORK ) { |
---|
337 | return roar_socket_open_fork(mode, host, port); |
---|
338 | } else if ( type == ROAR_SOCKET_TYPE_FILE ) { |
---|
339 | return roar_socket_open_file(mode, host, port); |
---|
340 | } else { |
---|
341 | return -1; |
---|
342 | } |
---|
343 | |
---|
344 | if ( mode == MODE_LISTEN ) |
---|
345 | if ( listen(fh, ROAR_SOCKET_QUEUE_LEN) == -1 ) { |
---|
346 | close(fh); |
---|
347 | return -1; |
---|
348 | } |
---|
349 | |
---|
350 | return fh; |
---|
351 | } |
---|
352 | |
---|
353 | int roar_socket_open_fork (int mode, char * host, int port) { |
---|
354 | int socks[2]; |
---|
355 | int r; |
---|
356 | char fhstr[8]; |
---|
357 | |
---|
358 | if ( mode == MODE_LISTEN ) |
---|
359 | return -1; |
---|
360 | |
---|
361 | if ( socketpair(AF_UNIX, SOCK_STREAM, 0, socks) == -1 ) { |
---|
362 | return -1; |
---|
363 | } |
---|
364 | |
---|
365 | r = fork(); |
---|
366 | |
---|
367 | if ( r == -1 ) { // error! |
---|
368 | ROAR_ERR("roar_socket_open_fork(*): Can not fork: %s", strerror(errno)); |
---|
369 | close(socks[0]); |
---|
370 | close(socks[1]); |
---|
371 | return -1; |
---|
372 | } else if ( r == 0 ) { // we are the child |
---|
373 | close(socks[0]); |
---|
374 | |
---|
375 | close(ROAR_STDIN ); // we do not want roard to have any standard input |
---|
376 | close(ROAR_STDOUT); // STDOUT is also not needed, so we close it, |
---|
377 | // but STDERR we keep open for error messages. |
---|
378 | |
---|
379 | snprintf(fhstr, 7, "%i", socks[1]); |
---|
380 | |
---|
381 | execlp("roard", "roard", "--terminate", "--no-listen", "--client-fh", fhstr, NULL); |
---|
382 | |
---|
383 | // we are still alive? |
---|
384 | ROAR_ERR("roar_socket_open_fork(*): alive after exec(), that's bad!"); |
---|
385 | _exit(1); |
---|
386 | } else { // we are the parent |
---|
387 | close(socks[1]); |
---|
388 | return socks[0]; |
---|
389 | } |
---|
390 | |
---|
391 | return -1; |
---|
392 | } |
---|
393 | |
---|
394 | int roar_socket_open_file (int mode, char * host, int port) { |
---|
395 | int fh; |
---|
396 | |
---|
397 | if ( mode == MODE_LISTEN ) |
---|
398 | return -1; |
---|
399 | |
---|
400 | if ( (fh = open(host, O_RDONLY, 0644)) == -1 ) { |
---|
401 | ROAR_ERR("roar_socket_open_file(*): Can not open file %s: %s", host, strerror(errno)); |
---|
402 | } |
---|
403 | |
---|
404 | return fh; |
---|
405 | } |
---|
406 | |
---|
407 | // --- [ PROXY CODE ] --- |
---|
408 | |
---|
409 | // generic proxy code: |
---|
410 | |
---|
411 | int roar_socket_open_proxy (int mode, int type, char * host, int port, char * proxy_type) { |
---|
412 | int proxy_port; |
---|
413 | char proxy_host[ROAR_SOCKET_MAX_HOSTNAMELEN]; |
---|
414 | char * proxy_addr; |
---|
415 | int i; |
---|
416 | int fh; |
---|
417 | |
---|
418 | // TODO: change this so we support listen() proxys (ssh -R) |
---|
419 | if ( mode != MODE_CONNECT ) |
---|
420 | return -1; |
---|
421 | |
---|
422 | if ( !strcmp(proxy_type, "socks4a") ) { // for TOR, the only supported type at the moment |
---|
423 | proxy_addr = getenv("socks_proxy"); |
---|
424 | |
---|
425 | proxy_port = 9050; // TOR's default port |
---|
426 | |
---|
427 | if ( proxy_addr == NULL ) |
---|
428 | return -1; |
---|
429 | |
---|
430 | for (i = 0; proxy_addr[i] != 0 && proxy_addr[i] != ':' && i < ROAR_SOCKET_MAX_HOSTNAMELEN; i++) |
---|
431 | proxy_host[i] = proxy_addr[i]; |
---|
432 | proxy_host[i] = 0; |
---|
433 | |
---|
434 | if ( i == 0 ) // no hostname found |
---|
435 | return -1; |
---|
436 | |
---|
437 | if ( proxy_addr[i] == ':' ) |
---|
438 | proxy_port = atoi(&proxy_addr[i+1]); |
---|
439 | |
---|
440 | if ( (fh = roar_socket_open(mode, type, proxy_host, proxy_port)) == -1) { |
---|
441 | return -1; |
---|
442 | } |
---|
443 | |
---|
444 | if ( roar_socket_open_socks4a(mode, fh, host, port) == -1 ) { |
---|
445 | close(fh); |
---|
446 | return -1; |
---|
447 | } |
---|
448 | |
---|
449 | return fh; |
---|
450 | } else { |
---|
451 | return -1; // unknown type |
---|
452 | } |
---|
453 | } |
---|
454 | |
---|
455 | // protocoll dependet proxy code: |
---|
456 | |
---|
457 | int roar_socket_open_socks4a(int mode, int fh, char * host, int port) { |
---|
458 | char buf[9]; |
---|
459 | int len; |
---|
460 | |
---|
461 | buf[0] = 0x04; |
---|
462 | buf[1] = mode == MODE_CONNECT ? 0x01 : 0x02; |
---|
463 | *((uint16_t*)&buf[2]) = htons(port); |
---|
464 | buf[4] = 0x00; |
---|
465 | buf[5] = 0x00; |
---|
466 | buf[6] = 0x00; |
---|
467 | buf[7] = 0x01; |
---|
468 | buf[8] = 0x00; |
---|
469 | |
---|
470 | if ( write(fh, buf, 9) != 9 ) |
---|
471 | return -1; |
---|
472 | |
---|
473 | len = strlen(host); |
---|
474 | |
---|
475 | if ( write(fh, host, len) != len ) |
---|
476 | return -1; |
---|
477 | |
---|
478 | if ( write(fh, "\0", 1) != 1 ) |
---|
479 | return -1; |
---|
480 | |
---|
481 | if ( read(fh, buf, 8) != 8 ) |
---|
482 | return -1; |
---|
483 | |
---|
484 | if ( buf[1] != 0x5a ) |
---|
485 | return -1; |
---|
486 | |
---|
487 | return 0; |
---|
488 | } |
---|
489 | |
---|
490 | //ll |
---|