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Commit | Line | Data |
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caebeeca AC |
1 | /* |
2 | * wsockd.c: charybdis websockets helper | |
3 | * Copyright (C) 2007 Aaron Sethman <androsyn@ratbox.org> | |
4 | * Copyright (C) 2007 ircd-ratbox development team | |
5 | * Copyright (C) 2016 William Pitcock <nenolod@dereferenced.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 | |
20 | * USA | |
21 | */ | |
22 | ||
23 | #include "stdinc.h" | |
1160f6c9 | 24 | #include "sha1.h" |
caebeeca AC |
25 | |
26 | #define MAXPASSFD 4 | |
27 | #ifndef READBUF_SIZE | |
28 | #define READBUF_SIZE 16384 | |
29 | #endif | |
30 | ||
1160f6c9 AC |
31 | #define WEBSOCKET_SERVER_KEY "258EAFA5-E914-47DA-95CA-C5AB0DC85B11" |
32 | #define WEBSOCKET_ANSWER_STRING_1 "HTTP/1.1 101 Switching Protocols\r\nAccess-Control-Allow-Origin: *\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: " | |
33 | #define WEBSOCKET_ANSWER_STRING_2 "\r\n\r\n" | |
34 | ||
caebeeca AC |
35 | static void setup_signals(void); |
36 | static pid_t ppid; | |
37 | ||
38 | static inline uint32_t | |
39 | buf_to_uint32(uint8_t *buf) | |
40 | { | |
41 | uint32_t x; | |
42 | memcpy(&x, buf, sizeof(x)); | |
43 | return x; | |
44 | } | |
45 | ||
46 | static inline void | |
47 | uint32_to_buf(uint8_t *buf, uint32_t x) | |
48 | { | |
49 | memcpy(buf, &x, sizeof(x)); | |
50 | return; | |
51 | } | |
52 | ||
53 | typedef struct _mod_ctl_buf | |
54 | { | |
55 | rb_dlink_node node; | |
56 | uint8_t *buf; | |
57 | size_t buflen; | |
58 | rb_fde_t *F[MAXPASSFD]; | |
59 | int nfds; | |
60 | } mod_ctl_buf_t; | |
61 | ||
62 | typedef struct _mod_ctl | |
63 | { | |
64 | rb_dlink_node node; | |
65 | int cli_count; | |
66 | rb_fde_t *F; | |
67 | rb_fde_t *F_pipe; | |
68 | rb_dlink_list readq; | |
69 | rb_dlink_list writeq; | |
70 | } mod_ctl_t; | |
71 | ||
72 | static mod_ctl_t *mod_ctl; | |
73 | ||
74 | typedef struct _conn | |
75 | { | |
76 | rb_dlink_node node; | |
77 | mod_ctl_t *ctl; | |
1c8c63cb | 78 | |
1160f6c9 AC |
79 | rawbuf_head_t *modbuf_out; |
80 | rawbuf_head_t *modbuf_in; | |
1c8c63cb AC |
81 | |
82 | buf_head_t plainbuf_out; | |
83 | buf_head_t plainbuf_in; | |
caebeeca AC |
84 | |
85 | uint32_t id; | |
86 | ||
87 | rb_fde_t *mod_fd; | |
88 | rb_fde_t *plain_fd; | |
89 | uint64_t mod_out; | |
90 | uint64_t mod_in; | |
91 | uint64_t plain_in; | |
92 | uint64_t plain_out; | |
93 | uint8_t flags; | |
1160f6c9 AC |
94 | |
95 | char client_key[37]; /* maximum 36 bytes + nul */ | |
caebeeca AC |
96 | } conn_t; |
97 | ||
839f2fa2 AC |
98 | #define WEBSOCKET_OPCODE_CONTINUATION_FRAME 0 |
99 | #define WEBSOCKET_OPCODE_TEXT_FRAME 1 | |
100 | #define WEBSOCKET_OPCODE_BINARY_FRAME 2 | |
101 | #define WEBSOCKET_OPCODE_CLOSE_FRAME 8 | |
102 | #define WEBSOCKET_OPCODE_PING_FRAME 9 | |
103 | #define WEBSOCKET_OPCODE_PONG_FRAME 10 | |
104 | ||
105 | #define WEBSOCKET_MASK_LENGTH 4 | |
106 | ||
107 | #define WEBSOCKET_MAX_UNEXTENDED_PAYLOAD_DATA_LENGTH 125 | |
108 | ||
109 | typedef struct { | |
110 | uint8_t opcode_rsv_fin; // opcode: 4, rsv1: 1, rsv2: 1, rsv3: 1, fin: 1 | |
111 | uint8_t payload_length_mask; // payload_length: 7, mask: 1 | |
112 | } ws_frame_hdr_t; | |
113 | ||
114 | typedef struct { | |
115 | ws_frame_hdr_t header; | |
116 | uint8_t payload_data[WEBSOCKET_MAX_UNEXTENDED_PAYLOAD_DATA_LENGTH]; | |
117 | } ws_frame_payload_t; | |
118 | ||
119 | typedef struct { | |
120 | ws_frame_hdr_t header; | |
839f2fa2 AC |
121 | } ws_frame_t; |
122 | ||
123 | typedef struct { | |
124 | ws_frame_hdr_t header; | |
125 | uint16_t payload_length_extended; | |
839f2fa2 AC |
126 | } ws_frame_ext_t; |
127 | ||
128 | typedef struct { | |
129 | ws_frame_hdr_t header; | |
130 | uint64_t payload_length_extended; | |
839f2fa2 AC |
131 | } ws_frame_ext2_t; |
132 | ||
e688bcbd AC |
133 | static inline int |
134 | ws_frame_get_opcode(ws_frame_hdr_t *header) | |
135 | { | |
136 | return header->opcode_rsv_fin & 0xF; | |
137 | } | |
138 | ||
139 | static inline void | |
140 | ws_frame_set_opcode(ws_frame_hdr_t *header, int opcode) | |
141 | { | |
142 | header->opcode_rsv_fin &= ~0xF; | |
143 | header->opcode_rsv_fin |= opcode & 0xF; | |
144 | } | |
145 | ||
146 | static inline int | |
147 | ws_frame_get_fin(ws_frame_hdr_t *header) | |
148 | { | |
149 | return (header->opcode_rsv_fin >> 7) & 0x1; | |
150 | } | |
151 | ||
152 | static inline void | |
153 | ws_frame_set_fin(ws_frame_hdr_t *header, int fin) | |
154 | { | |
155 | header->opcode_rsv_fin &= ~(0x1 << 7); | |
156 | header->opcode_rsv_fin |= (fin << 7) & (0x1 << 7); | |
157 | } | |
158 | ||
37052804 AC |
159 | #ifdef _WIN32 |
160 | char * | |
2d89c9ff | 161 | strcasestr(const char *s, const char *find) |
37052804 AC |
162 | { |
163 | char c, sc; | |
164 | size_t len; | |
165 | ||
166 | if ((c = *find++) != 0) { | |
167 | c = tolower((unsigned char)c); | |
168 | len = strlen(find); | |
169 | do { | |
170 | do { | |
171 | if ((sc = *s++) == 0) | |
172 | return (NULL); | |
173 | } while ((char)tolower((unsigned char)sc) != c); | |
174 | } while (strnicmp(s, find, len) != 0); | |
175 | s--; | |
176 | } | |
177 | return ((char *)s); | |
178 | } | |
179 | #endif | |
180 | ||
1160f6c9 AC |
181 | static void close_conn(conn_t * conn, int wait_plain, const char *fmt, ...); |
182 | static void conn_mod_read_cb(rb_fde_t *fd, void *data); | |
183 | static void conn_plain_read_cb(rb_fde_t *fd, void *data); | |
184 | ||
caebeeca AC |
185 | #define FLAG_CORK 0x01 |
186 | #define FLAG_DEAD 0x02 | |
187 | #define FLAG_WSOCK 0x04 | |
1160f6c9 | 188 | #define FLAG_KEYED 0x08 |
caebeeca AC |
189 | |
190 | #define IsCork(x) ((x)->flags & FLAG_CORK) | |
191 | #define IsDead(x) ((x)->flags & FLAG_DEAD) | |
192 | #define IsWS(x) ((x)->flags & FLAG_WSOCK) | |
1160f6c9 | 193 | #define IsKeyed(x) ((x)->flags & FLAG_KEYED) |
caebeeca AC |
194 | |
195 | #define SetCork(x) ((x)->flags |= FLAG_CORK) | |
196 | #define SetDead(x) ((x)->flags |= FLAG_DEAD) | |
197 | #define SetWS(x) ((x)->flags |= FLAG_WSOCK) | |
1160f6c9 | 198 | #define SetKeyed(x) ((x)->flags |= FLAG_KEYED) |
caebeeca AC |
199 | |
200 | #define ClearCork(x) ((x)->flags &= ~FLAG_CORK) | |
201 | #define ClearDead(x) ((x)->flags &= ~FLAG_DEAD) | |
202 | #define ClearWS(x) ((x)->flags &= ~FLAG_WSOCK) | |
1160f6c9 | 203 | #define ClearKeyed(x) ((x)->flags &= ~FLAG_KEYED) |
caebeeca AC |
204 | |
205 | #define NO_WAIT 0x0 | |
206 | #define WAIT_PLAIN 0x1 | |
207 | ||
208 | #define HASH_WALK_SAFE(i, max, ptr, next, table) for(i = 0; i < max; i++) { RB_DLINK_FOREACH_SAFE(ptr, next, table[i].head) | |
209 | #define HASH_WALK_END } | |
210 | #define CONN_HASH_SIZE 2000 | |
211 | #define connid_hash(x) (&connid_hash_table[(x % CONN_HASH_SIZE)]) | |
212 | ||
1160f6c9 AC |
213 | static const char *remote_closed = "Remote host closed the connection"; |
214 | ||
caebeeca AC |
215 | static rb_dlink_list connid_hash_table[CONN_HASH_SIZE]; |
216 | static rb_dlink_list dead_list; | |
217 | ||
05e0aa9a AC |
218 | static void conn_plain_read_shutdown_cb(rb_fde_t *fd, void *data); |
219 | ||
caebeeca AC |
220 | #ifndef _WIN32 |
221 | static void | |
222 | dummy_handler(int sig) | |
223 | { | |
224 | return; | |
225 | } | |
226 | #endif | |
227 | ||
228 | static void | |
229 | setup_signals() | |
230 | { | |
231 | #ifndef _WIN32 | |
232 | struct sigaction act; | |
233 | ||
234 | act.sa_flags = 0; | |
235 | act.sa_handler = SIG_IGN; | |
236 | sigemptyset(&act.sa_mask); | |
237 | sigaddset(&act.sa_mask, SIGPIPE); | |
238 | sigaddset(&act.sa_mask, SIGALRM); | |
239 | #ifdef SIGTRAP | |
240 | sigaddset(&act.sa_mask, SIGTRAP); | |
241 | #endif | |
242 | ||
243 | #ifdef SIGWINCH | |
244 | sigaddset(&act.sa_mask, SIGWINCH); | |
245 | sigaction(SIGWINCH, &act, 0); | |
246 | #endif | |
247 | sigaction(SIGPIPE, &act, 0); | |
248 | #ifdef SIGTRAP | |
249 | sigaction(SIGTRAP, &act, 0); | |
250 | #endif | |
251 | ||
252 | act.sa_handler = dummy_handler; | |
253 | sigaction(SIGALRM, &act, 0); | |
254 | #endif | |
255 | } | |
256 | ||
257 | static int | |
258 | maxconn(void) | |
259 | { | |
260 | #if defined(RLIMIT_NOFILE) && defined(HAVE_SYS_RESOURCE_H) | |
261 | struct rlimit limit; | |
262 | ||
263 | if(!getrlimit(RLIMIT_NOFILE, &limit)) | |
264 | { | |
265 | return limit.rlim_cur; | |
266 | } | |
267 | #endif /* RLIMIT_FD_MAX */ | |
268 | return MAXCONNECTIONS; | |
269 | } | |
270 | ||
271 | static conn_t * | |
272 | conn_find_by_id(uint32_t id) | |
273 | { | |
274 | rb_dlink_node *ptr; | |
275 | conn_t *conn; | |
276 | ||
277 | RB_DLINK_FOREACH(ptr, (connid_hash(id))->head) | |
278 | { | |
279 | conn = ptr->data; | |
280 | if(conn->id == id && !IsDead(conn)) | |
281 | return conn; | |
282 | } | |
283 | return NULL; | |
284 | } | |
285 | ||
286 | static void | |
287 | conn_add_id_hash(conn_t * conn, uint32_t id) | |
288 | { | |
289 | conn->id = id; | |
290 | rb_dlinkAdd(conn, &conn->node, connid_hash(id)); | |
291 | } | |
292 | ||
293 | static void | |
294 | free_conn(conn_t * conn) | |
295 | { | |
1c8c63cb AC |
296 | rb_linebuf_donebuf(&conn->plainbuf_in); |
297 | rb_linebuf_donebuf(&conn->plainbuf_out); | |
298 | ||
1160f6c9 AC |
299 | rb_free_rawbuffer(conn->modbuf_in); |
300 | rb_free_rawbuffer(conn->modbuf_out); | |
1c8c63cb | 301 | |
caebeeca AC |
302 | rb_free(conn); |
303 | } | |
304 | ||
305 | static void | |
306 | clean_dead_conns(void *unused) | |
307 | { | |
308 | conn_t *conn; | |
309 | rb_dlink_node *ptr, *next; | |
310 | ||
311 | RB_DLINK_FOREACH_SAFE(ptr, next, dead_list.head) | |
312 | { | |
313 | conn = ptr->data; | |
314 | free_conn(conn); | |
315 | } | |
316 | ||
317 | dead_list.tail = dead_list.head = NULL; | |
318 | } | |
319 | ||
1160f6c9 AC |
320 | static void |
321 | conn_mod_write_sendq(rb_fde_t *fd, void *data) | |
322 | { | |
323 | conn_t *conn = data; | |
324 | const char *err; | |
325 | int retlen; | |
326 | ||
327 | if(IsDead(conn)) | |
328 | return; | |
329 | ||
330 | while((retlen = rb_rawbuf_flush(conn->modbuf_out, fd)) > 0) | |
331 | conn->mod_out += retlen; | |
332 | ||
333 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
334 | { | |
335 | if(retlen == 0) | |
336 | close_conn(conn, WAIT_PLAIN, "%s", remote_closed); | |
337 | err = strerror(errno); | |
338 | close_conn(conn, WAIT_PLAIN, "Write error: %s", err); | |
339 | return; | |
340 | } | |
341 | ||
342 | if(rb_rawbuf_length(conn->modbuf_out) > 0) | |
343 | rb_setselect(conn->mod_fd, RB_SELECT_WRITE, conn_mod_write_sendq, conn); | |
344 | else | |
345 | rb_setselect(conn->mod_fd, RB_SELECT_WRITE, NULL, NULL); | |
346 | ||
347 | if(IsCork(conn) && rb_rawbuf_length(conn->modbuf_out) == 0) | |
348 | { | |
349 | ClearCork(conn); | |
350 | conn_plain_read_cb(conn->plain_fd, conn); | |
351 | } | |
352 | } | |
353 | ||
354 | static void | |
355 | conn_mod_write(conn_t * conn, void *data, size_t len) | |
356 | { | |
357 | if(IsDead(conn)) /* no point in queueing to a dead man */ | |
358 | return; | |
359 | rb_rawbuf_append(conn->modbuf_out, data, len); | |
360 | } | |
361 | ||
f297042b AC |
362 | static void |
363 | conn_mod_write_frame(conn_t * conn, void *data, size_t len) | |
364 | { | |
e688bcbd AC |
365 | ws_frame_ext_t hdr; |
366 | ||
f297042b AC |
367 | if(IsDead(conn)) /* no point in queueing to a dead man */ |
368 | return; | |
e688bcbd AC |
369 | |
370 | ws_frame_set_opcode(&hdr.header, WEBSOCKET_OPCODE_BINARY_FRAME); | |
371 | hdr.header.payload_length_mask = 127; | |
372 | hdr.payload_length_extended = htons(len + 7); | |
373 | ||
374 | conn_mod_write(conn, &hdr, sizeof(hdr)); | |
375 | conn_mod_write(conn, data, len); | |
376 | conn_mod_write(conn, "\r\n\0", 3); | |
f297042b AC |
377 | } |
378 | ||
1160f6c9 AC |
379 | static void |
380 | conn_plain_write(conn_t * conn, void *data, size_t len) | |
381 | { | |
382 | if(IsDead(conn)) /* again no point in queueing to dead men */ | |
383 | return; | |
384 | rb_linebuf_put(&conn->plainbuf_out, data, len); | |
385 | } | |
386 | ||
05e0aa9a AC |
387 | static void |
388 | mod_write_ctl(rb_fde_t *F, void *data) | |
389 | { | |
390 | mod_ctl_t *ctl = data; | |
391 | mod_ctl_buf_t *ctl_buf; | |
392 | rb_dlink_node *ptr, *next; | |
393 | int retlen, x; | |
394 | ||
395 | RB_DLINK_FOREACH_SAFE(ptr, next, ctl->writeq.head) | |
396 | { | |
397 | ctl_buf = ptr->data; | |
398 | retlen = rb_send_fd_buf(ctl->F, ctl_buf->F, ctl_buf->nfds, ctl_buf->buf, | |
399 | ctl_buf->buflen, ppid); | |
400 | if(retlen > 0) | |
401 | { | |
402 | rb_dlinkDelete(ptr, &ctl->writeq); | |
403 | for(x = 0; x < ctl_buf->nfds; x++) | |
404 | rb_close(ctl_buf->F[x]); | |
405 | rb_free(ctl_buf->buf); | |
406 | rb_free(ctl_buf); | |
407 | ||
408 | } | |
409 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
410 | exit(0); | |
411 | ||
412 | } | |
413 | if(rb_dlink_list_length(&ctl->writeq) > 0) | |
414 | rb_setselect(ctl->F, RB_SELECT_WRITE, mod_write_ctl, ctl); | |
415 | } | |
416 | ||
417 | static void | |
418 | mod_cmd_write_queue(mod_ctl_t * ctl, const void *data, size_t len) | |
419 | { | |
420 | mod_ctl_buf_t *ctl_buf; | |
421 | ctl_buf = rb_malloc(sizeof(mod_ctl_buf_t)); | |
422 | ctl_buf->buf = rb_malloc(len); | |
423 | ctl_buf->buflen = len; | |
424 | memcpy(ctl_buf->buf, data, len); | |
425 | ctl_buf->nfds = 0; | |
426 | rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->writeq); | |
427 | mod_write_ctl(ctl->F, ctl); | |
428 | } | |
429 | ||
430 | static void | |
431 | close_conn(conn_t * conn, int wait_plain, const char *fmt, ...) | |
432 | { | |
433 | va_list ap; | |
434 | char reason[128]; /* must always be under 250 bytes */ | |
435 | uint8_t buf[256]; | |
436 | int len; | |
437 | if(IsDead(conn)) | |
438 | return; | |
439 | ||
1160f6c9 | 440 | rb_rawbuf_flush(conn->modbuf_out, conn->mod_fd); |
1c8c63cb | 441 | rb_linebuf_flush(conn->plain_fd, &conn->plainbuf_out); |
05e0aa9a AC |
442 | rb_close(conn->mod_fd); |
443 | SetDead(conn); | |
444 | ||
445 | rb_dlinkDelete(&conn->node, connid_hash(conn->id)); | |
446 | ||
447 | if(!wait_plain || fmt == NULL) | |
448 | { | |
449 | rb_close(conn->plain_fd); | |
450 | rb_dlinkAdd(conn, &conn->node, &dead_list); | |
451 | return; | |
452 | } | |
453 | ||
454 | rb_setselect(conn->plain_fd, RB_SELECT_READ, conn_plain_read_shutdown_cb, conn); | |
455 | rb_setselect(conn->plain_fd, RB_SELECT_WRITE, NULL, NULL); | |
456 | ||
457 | va_start(ap, fmt); | |
458 | vsnprintf(reason, sizeof(reason), fmt, ap); | |
459 | va_end(ap); | |
460 | ||
461 | buf[0] = 'D'; | |
462 | uint32_to_buf(&buf[1], conn->id); | |
463 | rb_strlcpy((char *) &buf[5], reason, sizeof(buf) - 5); | |
464 | len = (strlen(reason) + 1) + 5; | |
465 | mod_cmd_write_queue(conn->ctl, buf, len); | |
466 | } | |
467 | ||
caebeeca AC |
468 | static conn_t * |
469 | make_conn(mod_ctl_t * ctl, rb_fde_t *mod_fd, rb_fde_t *plain_fd) | |
470 | { | |
471 | conn_t *conn = rb_malloc(sizeof(conn_t)); | |
472 | conn->ctl = ctl; | |
caebeeca AC |
473 | conn->mod_fd = mod_fd; |
474 | conn->plain_fd = plain_fd; | |
475 | conn->id = -1; | |
caebeeca AC |
476 | rb_set_nb(mod_fd); |
477 | rb_set_nb(plain_fd); | |
1c8c63cb AC |
478 | |
479 | rb_linebuf_newbuf(&conn->plainbuf_in); | |
480 | rb_linebuf_newbuf(&conn->plainbuf_out); | |
481 | ||
1160f6c9 AC |
482 | conn->modbuf_in = rb_new_rawbuffer(); |
483 | conn->modbuf_out = rb_new_rawbuffer(); | |
1c8c63cb | 484 | |
caebeeca AC |
485 | return conn; |
486 | } | |
487 | ||
488 | static void | |
489 | cleanup_bad_message(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb) | |
490 | { | |
491 | int i; | |
492 | ||
493 | /* XXX should log this somehow */ | |
494 | for (i = 0; i < ctlb->nfds; i++) | |
495 | rb_close(ctlb->F[i]); | |
496 | } | |
497 | ||
1c8c63cb AC |
498 | static void |
499 | conn_mod_handshake_process(conn_t *conn) | |
500 | { | |
501 | char inbuf[READBUF_SIZE]; | |
502 | ||
e688bcbd AC |
503 | memset(inbuf, 0, sizeof inbuf); |
504 | ||
1c8c63cb AC |
505 | while (1) |
506 | { | |
1160f6c9 AC |
507 | char *p = NULL; |
508 | ||
e688bcbd | 509 | int dolen = rb_rawbuf_get(conn->modbuf_in, inbuf, sizeof inbuf); |
1c8c63cb AC |
510 | if (!dolen) |
511 | break; | |
1160f6c9 AC |
512 | |
513 | if ((p = strcasestr(inbuf, "Sec-WebSocket-Key:")) != NULL) | |
514 | { | |
515 | char *start, *end; | |
516 | ||
517 | start = p + strlen("Sec-WebSocket-Key:"); | |
518 | ||
519 | for (; start < (inbuf + READBUF_SIZE) && *start; start++) | |
520 | { | |
521 | if (*start != ' ' && *start != '\t') | |
522 | break; | |
523 | } | |
524 | ||
525 | for (end = start; end < (inbuf + READBUF_SIZE) && *end; end++) | |
526 | { | |
527 | if (*end == '\r' || *end == '\n') | |
528 | { | |
529 | *end = '\0'; | |
530 | break; | |
531 | } | |
532 | } | |
533 | ||
534 | rb_strlcpy(conn->client_key, start, sizeof(conn->client_key)); | |
535 | SetKeyed(conn); | |
536 | } | |
537 | } | |
538 | ||
539 | if (IsKeyed(conn)) | |
540 | { | |
541 | SHA1 sha1; | |
542 | uint8_t digest[SHA1_DIGEST_LENGTH]; | |
543 | char *resp; | |
544 | ||
545 | sha1_init(&sha1); | |
546 | sha1_update(&sha1, (uint8_t *) conn->client_key, strlen(conn->client_key)); | |
547 | sha1_update(&sha1, (uint8_t *) WEBSOCKET_SERVER_KEY, strlen(WEBSOCKET_SERVER_KEY)); | |
548 | sha1_final(&sha1, digest); | |
549 | ||
550 | resp = (char *) rb_base64_encode(digest, SHA1_DIGEST_LENGTH); | |
551 | ||
552 | conn_mod_write(conn, WEBSOCKET_ANSWER_STRING_1, strlen(WEBSOCKET_ANSWER_STRING_1)); | |
553 | conn_mod_write(conn, resp, strlen(resp)); | |
554 | conn_mod_write(conn, WEBSOCKET_ANSWER_STRING_2, strlen(WEBSOCKET_ANSWER_STRING_2)); | |
555 | ||
556 | rb_free(resp); | |
1c8c63cb | 557 | } |
1160f6c9 AC |
558 | |
559 | conn_mod_write_sendq(conn->mod_fd, conn); | |
1c8c63cb AC |
560 | } |
561 | ||
caebeeca | 562 | static void |
f297042b | 563 | conn_mod_read_cb(rb_fde_t *fd, void *data) |
05e0aa9a AC |
564 | { |
565 | char inbuf[READBUF_SIZE]; | |
e688bcbd AC |
566 | |
567 | memset(inbuf, 0, sizeof inbuf); | |
568 | ||
05e0aa9a AC |
569 | conn_t *conn = data; |
570 | int length = 0; | |
571 | if (conn == NULL) | |
572 | return; | |
573 | ||
574 | if (IsDead(conn)) | |
575 | return; | |
576 | ||
577 | while (1) | |
578 | { | |
579 | if (IsDead(conn)) | |
580 | return; | |
581 | ||
1c8c63cb AC |
582 | length = rb_read(fd, inbuf, sizeof(inbuf)); |
583 | ||
584 | if (length < 0) | |
585 | { | |
586 | if (rb_ignore_errno(errno)) | |
f297042b | 587 | rb_setselect(fd, RB_SELECT_READ, conn_mod_read_cb, conn); |
1c8c63cb AC |
588 | else |
589 | close_conn(conn, NO_WAIT, "Connection closed"); | |
590 | ||
591 | return; | |
592 | } | |
593 | else if (length == 0) | |
05e0aa9a AC |
594 | { |
595 | close_conn(conn, NO_WAIT, "Connection closed"); | |
596 | return; | |
597 | } | |
1c8c63cb | 598 | |
1160f6c9 | 599 | rb_rawbuf_append(conn->modbuf_in, inbuf, length); |
f297042b AC |
600 | if (!IsKeyed(conn)) |
601 | conn_mod_handshake_process(conn); | |
1c8c63cb AC |
602 | |
603 | if (length < sizeof(inbuf)) | |
604 | { | |
f297042b | 605 | rb_setselect(fd, RB_SELECT_READ, conn_mod_read_cb, conn); |
1c8c63cb AC |
606 | return; |
607 | } | |
05e0aa9a AC |
608 | } |
609 | } | |
610 | ||
f297042b AC |
611 | static bool |
612 | plain_check_cork(conn_t * conn) | |
613 | { | |
614 | if(rb_rawbuf_length(conn->modbuf_out) >= 4096) | |
615 | { | |
616 | /* if we have over 4k pending outbound, don't read until | |
617 | * we've cleared the queue */ | |
618 | SetCork(conn); | |
619 | rb_setselect(conn->plain_fd, RB_SELECT_READ, NULL, NULL); | |
620 | /* try to write */ | |
e688bcbd AC |
621 | if (IsKeyed(conn)) |
622 | conn_mod_write_sendq(conn->mod_fd, conn); | |
f297042b AC |
623 | return true; |
624 | } | |
625 | ||
626 | return false; | |
627 | } | |
628 | ||
05e0aa9a | 629 | static void |
f297042b | 630 | conn_plain_process_recvq(conn_t *conn) |
05e0aa9a | 631 | { |
f297042b AC |
632 | char inbuf[READBUF_SIZE]; |
633 | ||
e688bcbd AC |
634 | memset(inbuf, 0, sizeof inbuf); |
635 | ||
f297042b AC |
636 | while (1) |
637 | { | |
e688bcbd | 638 | int dolen = rb_linebuf_get(&conn->plainbuf_in, inbuf, sizeof inbuf, LINEBUF_COMPLETE, LINEBUF_PARSED); |
f297042b AC |
639 | if (!dolen) |
640 | break; | |
641 | ||
642 | conn_mod_write_frame(conn, inbuf, dolen); | |
643 | } | |
e688bcbd AC |
644 | |
645 | if (IsKeyed(conn)) | |
646 | conn_mod_write_sendq(conn->mod_fd, conn); | |
05e0aa9a AC |
647 | } |
648 | ||
649 | static void | |
650 | conn_plain_read_cb(rb_fde_t *fd, void *data) | |
651 | { | |
f297042b | 652 | char inbuf[READBUF_SIZE]; |
e688bcbd AC |
653 | |
654 | memset(inbuf, 0, sizeof inbuf); | |
655 | ||
f297042b AC |
656 | conn_t *conn = data; |
657 | int length = 0; | |
658 | if(conn == NULL) | |
659 | return; | |
660 | ||
661 | if(IsDead(conn)) | |
662 | return; | |
663 | ||
664 | if(plain_check_cork(conn)) | |
665 | return; | |
666 | ||
667 | while(1) | |
668 | { | |
669 | if(IsDead(conn)) | |
670 | return; | |
671 | ||
672 | length = rb_read(conn->plain_fd, inbuf, sizeof(inbuf)); | |
673 | ||
674 | if(length == 0 || (length < 0 && !rb_ignore_errno(errno))) | |
675 | { | |
676 | close_conn(conn, NO_WAIT, NULL); | |
677 | return; | |
678 | } | |
679 | ||
680 | if(length < 0) | |
681 | { | |
682 | rb_setselect(conn->plain_fd, RB_SELECT_READ, conn_plain_read_cb, conn); | |
e688bcbd AC |
683 | if (IsKeyed(conn)) |
684 | conn_plain_process_recvq(conn); | |
f297042b AC |
685 | return; |
686 | } | |
687 | conn->plain_in += length; | |
688 | ||
689 | (void) rb_linebuf_parse(&conn->plainbuf_in, inbuf, sizeof(inbuf), 0); | |
690 | ||
691 | if(IsDead(conn)) | |
692 | return; | |
693 | if(plain_check_cork(conn)) | |
694 | return; | |
695 | } | |
05e0aa9a AC |
696 | } |
697 | ||
698 | static void | |
699 | conn_plain_read_shutdown_cb(rb_fde_t *fd, void *data) | |
700 | { | |
701 | char inbuf[READBUF_SIZE]; | |
702 | conn_t *conn = data; | |
703 | int length = 0; | |
704 | ||
705 | if(conn == NULL) | |
706 | return; | |
707 | ||
708 | while(1) | |
709 | { | |
710 | length = rb_read(conn->plain_fd, inbuf, sizeof(inbuf)); | |
711 | ||
712 | if(length == 0 || (length < 0 && !rb_ignore_errno(errno))) | |
713 | { | |
714 | rb_close(conn->plain_fd); | |
715 | rb_dlinkAdd(conn, &conn->node, &dead_list); | |
716 | return; | |
717 | } | |
718 | ||
719 | if(length < 0) | |
720 | { | |
721 | rb_setselect(conn->plain_fd, RB_SELECT_READ, conn_plain_read_shutdown_cb, conn); | |
722 | return; | |
723 | } | |
724 | } | |
725 | } | |
726 | ||
727 | static void | |
728 | wsock_process(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb) | |
caebeeca AC |
729 | { |
730 | conn_t *conn; | |
731 | uint32_t id; | |
732 | ||
733 | conn = make_conn(ctl, ctlb->F[0], ctlb->F[1]); | |
734 | ||
735 | id = buf_to_uint32(&ctlb->buf[1]); | |
736 | conn_add_id_hash(conn, id); | |
737 | SetWS(conn); | |
738 | ||
739 | if(rb_get_type(conn->mod_fd) & RB_FD_UNKNOWN) | |
740 | rb_set_type(conn->mod_fd, RB_FD_SOCKET); | |
741 | ||
742 | if(rb_get_type(conn->plain_fd) == RB_FD_UNKNOWN) | |
743 | rb_set_type(conn->plain_fd, RB_FD_SOCKET); | |
744 | ||
f297042b | 745 | conn_mod_read_cb(conn->mod_fd, conn); |
e688bcbd | 746 | conn_plain_read_cb(conn->plain_fd, conn); |
caebeeca AC |
747 | } |
748 | ||
749 | static void | |
750 | mod_process_cmd_recv(mod_ctl_t * ctl) | |
751 | { | |
752 | rb_dlink_node *ptr, *next; | |
753 | mod_ctl_buf_t *ctl_buf; | |
754 | ||
755 | RB_DLINK_FOREACH_SAFE(ptr, next, ctl->readq.head) | |
756 | { | |
757 | ctl_buf = ptr->data; | |
758 | ||
759 | switch (*ctl_buf->buf) | |
760 | { | |
761 | case 'A': | |
762 | { | |
763 | if (ctl_buf->nfds != 2 || ctl_buf->buflen != 5) | |
764 | { | |
765 | cleanup_bad_message(ctl, ctl_buf); | |
766 | break; | |
767 | } | |
05e0aa9a | 768 | wsock_process(ctl, ctl_buf); |
caebeeca AC |
769 | break; |
770 | } | |
771 | default: | |
772 | break; | |
773 | /* Log unknown commands */ | |
774 | } | |
775 | rb_dlinkDelete(ptr, &ctl->readq); | |
776 | rb_free(ctl_buf->buf); | |
777 | rb_free(ctl_buf); | |
778 | } | |
779 | ||
780 | } | |
781 | ||
782 | static void | |
783 | mod_read_ctl(rb_fde_t *F, void *data) | |
784 | { | |
785 | mod_ctl_buf_t *ctl_buf; | |
786 | mod_ctl_t *ctl = data; | |
787 | int retlen; | |
788 | int i; | |
789 | ||
790 | do | |
791 | { | |
792 | ctl_buf = rb_malloc(sizeof(mod_ctl_buf_t)); | |
793 | ctl_buf->buf = rb_malloc(READBUF_SIZE); | |
794 | ctl_buf->buflen = READBUF_SIZE; | |
795 | retlen = rb_recv_fd_buf(ctl->F, ctl_buf->buf, ctl_buf->buflen, ctl_buf->F, | |
796 | MAXPASSFD); | |
797 | if(retlen <= 0) | |
798 | { | |
799 | rb_free(ctl_buf->buf); | |
800 | rb_free(ctl_buf); | |
801 | } | |
802 | else | |
803 | { | |
804 | ctl_buf->buflen = retlen; | |
805 | rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->readq); | |
806 | for (i = 0; i < MAXPASSFD && ctl_buf->F[i] != NULL; i++) | |
807 | ; | |
808 | ctl_buf->nfds = i; | |
809 | } | |
810 | } | |
811 | while(retlen > 0); | |
812 | ||
813 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
814 | exit(0); | |
815 | ||
816 | mod_process_cmd_recv(ctl); | |
817 | rb_setselect(ctl->F, RB_SELECT_READ, mod_read_ctl, ctl); | |
818 | } | |
819 | ||
caebeeca AC |
820 | static void |
821 | read_pipe_ctl(rb_fde_t *F, void *data) | |
822 | { | |
823 | char inbuf[READBUF_SIZE]; | |
824 | int retlen; | |
825 | while((retlen = rb_read(F, inbuf, sizeof(inbuf))) > 0) | |
826 | { | |
827 | ;; /* we don't do anything with the pipe really, just care if the other process dies.. */ | |
828 | } | |
829 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
830 | exit(0); | |
831 | rb_setselect(F, RB_SELECT_READ, read_pipe_ctl, NULL); | |
832 | } | |
833 | ||
834 | int | |
835 | main(int argc, char **argv) | |
836 | { | |
837 | const char *s_ctlfd, *s_pipe, *s_pid; | |
838 | int ctlfd, pipefd, x, maxfd; | |
839 | maxfd = maxconn(); | |
840 | ||
841 | s_ctlfd = getenv("CTL_FD"); | |
842 | s_pipe = getenv("CTL_PIPE"); | |
843 | s_pid = getenv("CTL_PPID"); | |
844 | ||
845 | if(s_ctlfd == NULL || s_pipe == NULL || s_pid == NULL) | |
846 | { | |
847 | fprintf(stderr, | |
848 | "This is the charybdis wsockd for internal ircd use.\n"); | |
849 | fprintf(stderr, | |
850 | "You aren't supposed to run me directly. Exiting.\n"); | |
851 | exit(1); | |
852 | } | |
853 | ||
854 | ctlfd = atoi(s_ctlfd); | |
855 | pipefd = atoi(s_pipe); | |
856 | ppid = atoi(s_pid); | |
857 | x = 0; | |
858 | #ifndef _WIN32 | |
859 | for(x = 0; x < maxfd; x++) | |
860 | { | |
861 | if(x != ctlfd && x != pipefd && x > 2) | |
862 | close(x); | |
863 | } | |
864 | x = open("/dev/null", O_RDWR); | |
865 | ||
866 | if(x >= 0) | |
867 | { | |
868 | if(ctlfd != 0 && pipefd != 0) | |
869 | dup2(x, 0); | |
870 | if(ctlfd != 1 && pipefd != 1) | |
871 | dup2(x, 1); | |
872 | if(ctlfd != 2 && pipefd != 2) | |
873 | dup2(x, 2); | |
874 | if(x > 2) | |
875 | close(x); | |
876 | } | |
877 | #endif | |
878 | setup_signals(); | |
879 | rb_lib_init(NULL, NULL, NULL, 0, maxfd, 1024, 4096); | |
1c8c63cb | 880 | rb_linebuf_init(4096); |
1160f6c9 | 881 | rb_init_rawbuffers(4096); |
caebeeca AC |
882 | |
883 | mod_ctl = rb_malloc(sizeof(mod_ctl_t)); | |
884 | mod_ctl->F = rb_open(ctlfd, RB_FD_SOCKET, "ircd control socket"); | |
885 | mod_ctl->F_pipe = rb_open(pipefd, RB_FD_PIPE, "ircd pipe"); | |
886 | rb_set_nb(mod_ctl->F); | |
887 | rb_set_nb(mod_ctl->F_pipe); | |
888 | rb_event_addish("clean_dead_conns", clean_dead_conns, NULL, 10); | |
889 | read_pipe_ctl(mod_ctl->F_pipe, NULL); | |
890 | mod_read_ctl(mod_ctl->F, mod_ctl); | |
891 | ||
892 | rb_lib_loop(0); | |
893 | return 0; | |
894 | } |