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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 | ||
1160f6c9 AC |
159 | static void close_conn(conn_t * conn, int wait_plain, const char *fmt, ...); |
160 | static void conn_mod_read_cb(rb_fde_t *fd, void *data); | |
161 | static void conn_plain_read_cb(rb_fde_t *fd, void *data); | |
c3780ae2 | 162 | static void conn_plain_process_recvq(conn_t *conn); |
1160f6c9 | 163 | |
caebeeca AC |
164 | #define FLAG_CORK 0x01 |
165 | #define FLAG_DEAD 0x02 | |
166 | #define FLAG_WSOCK 0x04 | |
1160f6c9 | 167 | #define FLAG_KEYED 0x08 |
caebeeca AC |
168 | |
169 | #define IsCork(x) ((x)->flags & FLAG_CORK) | |
170 | #define IsDead(x) ((x)->flags & FLAG_DEAD) | |
171 | #define IsWS(x) ((x)->flags & FLAG_WSOCK) | |
1160f6c9 | 172 | #define IsKeyed(x) ((x)->flags & FLAG_KEYED) |
caebeeca AC |
173 | |
174 | #define SetCork(x) ((x)->flags |= FLAG_CORK) | |
175 | #define SetDead(x) ((x)->flags |= FLAG_DEAD) | |
176 | #define SetWS(x) ((x)->flags |= FLAG_WSOCK) | |
1160f6c9 | 177 | #define SetKeyed(x) ((x)->flags |= FLAG_KEYED) |
caebeeca AC |
178 | |
179 | #define ClearCork(x) ((x)->flags &= ~FLAG_CORK) | |
180 | #define ClearDead(x) ((x)->flags &= ~FLAG_DEAD) | |
181 | #define ClearWS(x) ((x)->flags &= ~FLAG_WSOCK) | |
1160f6c9 | 182 | #define ClearKeyed(x) ((x)->flags &= ~FLAG_KEYED) |
caebeeca AC |
183 | |
184 | #define NO_WAIT 0x0 | |
185 | #define WAIT_PLAIN 0x1 | |
186 | ||
187 | #define HASH_WALK_SAFE(i, max, ptr, next, table) for(i = 0; i < max; i++) { RB_DLINK_FOREACH_SAFE(ptr, next, table[i].head) | |
188 | #define HASH_WALK_END } | |
189 | #define CONN_HASH_SIZE 2000 | |
190 | #define connid_hash(x) (&connid_hash_table[(x % CONN_HASH_SIZE)]) | |
191 | ||
1160f6c9 AC |
192 | static const char *remote_closed = "Remote host closed the connection"; |
193 | ||
caebeeca AC |
194 | static rb_dlink_list connid_hash_table[CONN_HASH_SIZE]; |
195 | static rb_dlink_list dead_list; | |
196 | ||
05e0aa9a AC |
197 | static void conn_plain_read_shutdown_cb(rb_fde_t *fd, void *data); |
198 | ||
caebeeca AC |
199 | #ifndef _WIN32 |
200 | static void | |
201 | dummy_handler(int sig) | |
202 | { | |
203 | return; | |
204 | } | |
205 | #endif | |
206 | ||
207 | static void | |
208 | setup_signals() | |
209 | { | |
210 | #ifndef _WIN32 | |
211 | struct sigaction act; | |
212 | ||
213 | act.sa_flags = 0; | |
214 | act.sa_handler = SIG_IGN; | |
215 | sigemptyset(&act.sa_mask); | |
216 | sigaddset(&act.sa_mask, SIGPIPE); | |
217 | sigaddset(&act.sa_mask, SIGALRM); | |
218 | #ifdef SIGTRAP | |
219 | sigaddset(&act.sa_mask, SIGTRAP); | |
220 | #endif | |
221 | ||
222 | #ifdef SIGWINCH | |
223 | sigaddset(&act.sa_mask, SIGWINCH); | |
224 | sigaction(SIGWINCH, &act, 0); | |
225 | #endif | |
226 | sigaction(SIGPIPE, &act, 0); | |
227 | #ifdef SIGTRAP | |
228 | sigaction(SIGTRAP, &act, 0); | |
229 | #endif | |
230 | ||
231 | act.sa_handler = dummy_handler; | |
232 | sigaction(SIGALRM, &act, 0); | |
233 | #endif | |
234 | } | |
235 | ||
236 | static int | |
237 | maxconn(void) | |
238 | { | |
239 | #if defined(RLIMIT_NOFILE) && defined(HAVE_SYS_RESOURCE_H) | |
240 | struct rlimit limit; | |
241 | ||
242 | if(!getrlimit(RLIMIT_NOFILE, &limit)) | |
243 | { | |
244 | return limit.rlim_cur; | |
245 | } | |
246 | #endif /* RLIMIT_FD_MAX */ | |
247 | return MAXCONNECTIONS; | |
248 | } | |
249 | ||
250 | static conn_t * | |
251 | conn_find_by_id(uint32_t id) | |
252 | { | |
253 | rb_dlink_node *ptr; | |
254 | conn_t *conn; | |
255 | ||
256 | RB_DLINK_FOREACH(ptr, (connid_hash(id))->head) | |
257 | { | |
258 | conn = ptr->data; | |
259 | if(conn->id == id && !IsDead(conn)) | |
260 | return conn; | |
261 | } | |
262 | return NULL; | |
263 | } | |
264 | ||
265 | static void | |
266 | conn_add_id_hash(conn_t * conn, uint32_t id) | |
267 | { | |
268 | conn->id = id; | |
269 | rb_dlinkAdd(conn, &conn->node, connid_hash(id)); | |
270 | } | |
271 | ||
272 | static void | |
273 | free_conn(conn_t * conn) | |
274 | { | |
1c8c63cb AC |
275 | rb_linebuf_donebuf(&conn->plainbuf_in); |
276 | rb_linebuf_donebuf(&conn->plainbuf_out); | |
277 | ||
1160f6c9 AC |
278 | rb_free_rawbuffer(conn->modbuf_in); |
279 | rb_free_rawbuffer(conn->modbuf_out); | |
1c8c63cb | 280 | |
caebeeca AC |
281 | rb_free(conn); |
282 | } | |
283 | ||
284 | static void | |
285 | clean_dead_conns(void *unused) | |
286 | { | |
287 | conn_t *conn; | |
288 | rb_dlink_node *ptr, *next; | |
289 | ||
290 | RB_DLINK_FOREACH_SAFE(ptr, next, dead_list.head) | |
291 | { | |
292 | conn = ptr->data; | |
293 | free_conn(conn); | |
294 | } | |
295 | ||
296 | dead_list.tail = dead_list.head = NULL; | |
297 | } | |
298 | ||
c90e5c08 AC |
299 | static void |
300 | conn_plain_write_sendq(rb_fde_t *fd, void *data) | |
301 | { | |
302 | conn_t *conn = data; | |
303 | int retlen; | |
304 | ||
305 | if(IsDead(conn)) | |
306 | return; | |
307 | ||
308 | while((retlen = rb_linebuf_flush(fd, &conn->plainbuf_out)) > 0) | |
309 | conn->plain_out += retlen; | |
310 | ||
311 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
312 | { | |
313 | close_conn(data, NO_WAIT, NULL); | |
314 | return; | |
315 | } | |
316 | ||
317 | if(rb_linebuf_alloclen(&conn->plainbuf_out) > 0) | |
318 | rb_setselect(conn->plain_fd, RB_SELECT_WRITE, conn_plain_write_sendq, conn); | |
319 | else | |
320 | rb_setselect(conn->plain_fd, RB_SELECT_WRITE, NULL, NULL); | |
321 | } | |
322 | ||
1160f6c9 AC |
323 | static void |
324 | conn_mod_write_sendq(rb_fde_t *fd, void *data) | |
325 | { | |
326 | conn_t *conn = data; | |
327 | const char *err; | |
328 | int retlen; | |
329 | ||
330 | if(IsDead(conn)) | |
331 | return; | |
332 | ||
333 | while((retlen = rb_rawbuf_flush(conn->modbuf_out, fd)) > 0) | |
334 | conn->mod_out += retlen; | |
335 | ||
336 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
337 | { | |
338 | if(retlen == 0) | |
339 | close_conn(conn, WAIT_PLAIN, "%s", remote_closed); | |
340 | err = strerror(errno); | |
341 | close_conn(conn, WAIT_PLAIN, "Write error: %s", err); | |
342 | return; | |
343 | } | |
344 | ||
345 | if(rb_rawbuf_length(conn->modbuf_out) > 0) | |
346 | rb_setselect(conn->mod_fd, RB_SELECT_WRITE, conn_mod_write_sendq, conn); | |
347 | else | |
348 | rb_setselect(conn->mod_fd, RB_SELECT_WRITE, NULL, NULL); | |
349 | ||
350 | if(IsCork(conn) && rb_rawbuf_length(conn->modbuf_out) == 0) | |
351 | { | |
352 | ClearCork(conn); | |
353 | conn_plain_read_cb(conn->plain_fd, conn); | |
354 | } | |
355 | } | |
356 | ||
357 | static void | |
358 | conn_mod_write(conn_t * conn, void *data, size_t len) | |
359 | { | |
360 | if(IsDead(conn)) /* no point in queueing to a dead man */ | |
361 | return; | |
362 | rb_rawbuf_append(conn->modbuf_out, data, len); | |
363 | } | |
364 | ||
f297042b | 365 | static void |
7428c4e0 | 366 | conn_mod_write_short_frame(conn_t * conn, void *data, int len) |
f297042b | 367 | { |
7428c4e0 | 368 | ws_frame_hdr_t hdr; |
e688bcbd | 369 | |
5902547a | 370 | ws_frame_set_opcode(&hdr, WEBSOCKET_OPCODE_TEXT_FRAME); |
dab62367 | 371 | ws_frame_set_fin(&hdr, 1); |
7428c4e0 AC |
372 | hdr.payload_length_mask = (len + 2) & 0x7f; |
373 | ||
374 | conn_mod_write(conn, &hdr, sizeof(hdr)); | |
375 | conn_mod_write(conn, data, len); | |
376 | conn_mod_write(conn, "\r\n", 2); | |
377 | } | |
378 | ||
379 | static void | |
380 | conn_mod_write_long_frame(conn_t * conn, void *data, int len) | |
381 | { | |
382 | ws_frame_ext_t hdr; | |
e688bcbd | 383 | |
5902547a | 384 | ws_frame_set_opcode(&hdr.header, WEBSOCKET_OPCODE_TEXT_FRAME); |
dab62367 | 385 | ws_frame_set_fin(&hdr.header, 1); |
7428c4e0 AC |
386 | hdr.header.payload_length_mask = 126; |
387 | hdr.payload_length_extended = htons(len + 2); | |
e688bcbd AC |
388 | |
389 | conn_mod_write(conn, &hdr, sizeof(hdr)); | |
390 | conn_mod_write(conn, data, len); | |
7428c4e0 AC |
391 | conn_mod_write(conn, "\r\n", 2); |
392 | } | |
393 | ||
394 | static void | |
395 | conn_mod_write_frame(conn_t *conn, void *data, int len) | |
396 | { | |
397 | if(IsDead(conn)) /* no point in queueing to a dead man */ | |
398 | return; | |
399 | ||
400 | if (len < 123) | |
401 | return conn_mod_write_short_frame(conn, data, len); | |
402 | ||
403 | return conn_mod_write_long_frame(conn, data, len); | |
f297042b AC |
404 | } |
405 | ||
1160f6c9 AC |
406 | static void |
407 | conn_plain_write(conn_t * conn, void *data, size_t len) | |
408 | { | |
409 | if(IsDead(conn)) /* again no point in queueing to dead men */ | |
410 | return; | |
411 | rb_linebuf_put(&conn->plainbuf_out, data, len); | |
412 | } | |
413 | ||
05e0aa9a AC |
414 | static void |
415 | mod_write_ctl(rb_fde_t *F, void *data) | |
416 | { | |
417 | mod_ctl_t *ctl = data; | |
418 | mod_ctl_buf_t *ctl_buf; | |
419 | rb_dlink_node *ptr, *next; | |
420 | int retlen, x; | |
421 | ||
422 | RB_DLINK_FOREACH_SAFE(ptr, next, ctl->writeq.head) | |
423 | { | |
424 | ctl_buf = ptr->data; | |
425 | retlen = rb_send_fd_buf(ctl->F, ctl_buf->F, ctl_buf->nfds, ctl_buf->buf, | |
426 | ctl_buf->buflen, ppid); | |
427 | if(retlen > 0) | |
428 | { | |
429 | rb_dlinkDelete(ptr, &ctl->writeq); | |
430 | for(x = 0; x < ctl_buf->nfds; x++) | |
431 | rb_close(ctl_buf->F[x]); | |
432 | rb_free(ctl_buf->buf); | |
433 | rb_free(ctl_buf); | |
434 | ||
435 | } | |
436 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
437 | exit(0); | |
438 | ||
439 | } | |
440 | if(rb_dlink_list_length(&ctl->writeq) > 0) | |
441 | rb_setselect(ctl->F, RB_SELECT_WRITE, mod_write_ctl, ctl); | |
442 | } | |
443 | ||
444 | static void | |
445 | mod_cmd_write_queue(mod_ctl_t * ctl, const void *data, size_t len) | |
446 | { | |
447 | mod_ctl_buf_t *ctl_buf; | |
448 | ctl_buf = rb_malloc(sizeof(mod_ctl_buf_t)); | |
449 | ctl_buf->buf = rb_malloc(len); | |
450 | ctl_buf->buflen = len; | |
451 | memcpy(ctl_buf->buf, data, len); | |
452 | ctl_buf->nfds = 0; | |
453 | rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->writeq); | |
454 | mod_write_ctl(ctl->F, ctl); | |
455 | } | |
456 | ||
457 | static void | |
458 | close_conn(conn_t * conn, int wait_plain, const char *fmt, ...) | |
459 | { | |
460 | va_list ap; | |
461 | char reason[128]; /* must always be under 250 bytes */ | |
462 | uint8_t buf[256]; | |
463 | int len; | |
464 | if(IsDead(conn)) | |
465 | return; | |
466 | ||
c3780ae2 AC |
467 | if (IsKeyed(conn)) |
468 | conn_plain_process_recvq(conn); | |
469 | ||
1160f6c9 | 470 | rb_rawbuf_flush(conn->modbuf_out, conn->mod_fd); |
1c8c63cb | 471 | rb_linebuf_flush(conn->plain_fd, &conn->plainbuf_out); |
05e0aa9a AC |
472 | rb_close(conn->mod_fd); |
473 | SetDead(conn); | |
474 | ||
475 | rb_dlinkDelete(&conn->node, connid_hash(conn->id)); | |
476 | ||
477 | if(!wait_plain || fmt == NULL) | |
478 | { | |
479 | rb_close(conn->plain_fd); | |
480 | rb_dlinkAdd(conn, &conn->node, &dead_list); | |
481 | return; | |
482 | } | |
483 | ||
484 | rb_setselect(conn->plain_fd, RB_SELECT_READ, conn_plain_read_shutdown_cb, conn); | |
485 | rb_setselect(conn->plain_fd, RB_SELECT_WRITE, NULL, NULL); | |
486 | ||
487 | va_start(ap, fmt); | |
488 | vsnprintf(reason, sizeof(reason), fmt, ap); | |
489 | va_end(ap); | |
490 | ||
491 | buf[0] = 'D'; | |
492 | uint32_to_buf(&buf[1], conn->id); | |
493 | rb_strlcpy((char *) &buf[5], reason, sizeof(buf) - 5); | |
494 | len = (strlen(reason) + 1) + 5; | |
495 | mod_cmd_write_queue(conn->ctl, buf, len); | |
496 | } | |
497 | ||
caebeeca AC |
498 | static conn_t * |
499 | make_conn(mod_ctl_t * ctl, rb_fde_t *mod_fd, rb_fde_t *plain_fd) | |
500 | { | |
501 | conn_t *conn = rb_malloc(sizeof(conn_t)); | |
502 | conn->ctl = ctl; | |
caebeeca AC |
503 | conn->mod_fd = mod_fd; |
504 | conn->plain_fd = plain_fd; | |
505 | conn->id = -1; | |
caebeeca AC |
506 | rb_set_nb(mod_fd); |
507 | rb_set_nb(plain_fd); | |
1c8c63cb AC |
508 | |
509 | rb_linebuf_newbuf(&conn->plainbuf_in); | |
510 | rb_linebuf_newbuf(&conn->plainbuf_out); | |
511 | ||
1160f6c9 AC |
512 | conn->modbuf_in = rb_new_rawbuffer(); |
513 | conn->modbuf_out = rb_new_rawbuffer(); | |
1c8c63cb | 514 | |
caebeeca AC |
515 | return conn; |
516 | } | |
517 | ||
518 | static void | |
519 | cleanup_bad_message(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb) | |
520 | { | |
521 | int i; | |
522 | ||
523 | /* XXX should log this somehow */ | |
524 | for (i = 0; i < ctlb->nfds; i++) | |
525 | rb_close(ctlb->F[i]); | |
526 | } | |
527 | ||
d3f01ce7 AC |
528 | static void |
529 | ws_frame_unmask(char *msg, int length, uint8_t maskval[WEBSOCKET_MASK_LENGTH]) | |
530 | { | |
531 | int i; | |
532 | ||
533 | for (i = 0; i < length; i++) | |
534 | msg[i] = msg[i] ^ maskval[i % 4]; | |
535 | } | |
536 | ||
537 | static void | |
538 | conn_mod_process_frame(conn_t *conn, ws_frame_hdr_t *hdr, int masked) | |
539 | { | |
540 | char msg[WEBSOCKET_MAX_UNEXTENDED_PAYLOAD_DATA_LENGTH]; | |
541 | uint8_t maskval[WEBSOCKET_MASK_LENGTH]; | |
542 | int dolen; | |
543 | ||
544 | /* if we're masked, we get to collect the masking key for this frame */ | |
545 | if (masked) | |
546 | { | |
547 | dolen = rb_rawbuf_get(conn->modbuf_in, maskval, sizeof(maskval)); | |
548 | if (!dolen) | |
549 | { | |
550 | close_conn(conn, WAIT_PLAIN, "websocket error: fault unpacking unmask key"); | |
551 | return; | |
552 | } | |
553 | } | |
554 | ||
555 | dolen = rb_rawbuf_get(conn->modbuf_in, msg, hdr->payload_length_mask); | |
556 | if (!dolen) | |
557 | { | |
558 | close_conn(conn, WAIT_PLAIN, "websocket error: fault unpacking message"); | |
559 | return; | |
560 | } | |
561 | ||
562 | if (masked) | |
563 | ws_frame_unmask(msg, dolen, maskval); | |
564 | ||
565 | rb_linebuf_parse(&conn->plainbuf_out, msg, dolen, 1); | |
566 | } | |
567 | ||
568 | static void | |
569 | conn_mod_process_large(conn_t *conn, ws_frame_hdr_t *hdr, int masked) | |
570 | { | |
571 | char msg[READBUF_SIZE]; | |
572 | uint16_t msglen; | |
573 | uint8_t maskval[WEBSOCKET_MASK_LENGTH]; | |
574 | int dolen; | |
575 | ||
576 | memset(msg, 0, sizeof msg); | |
577 | ||
578 | dolen = rb_rawbuf_get(conn->modbuf_in, &msglen, sizeof(msglen)); | |
579 | if (!dolen) | |
580 | { | |
581 | close_conn(conn, WAIT_PLAIN, "websocket error: fault unpacking message size"); | |
582 | return; | |
583 | } | |
584 | ||
585 | msglen = ntohs(msglen); | |
586 | ||
587 | if (masked) | |
588 | { | |
589 | dolen = rb_rawbuf_get(conn->modbuf_in, maskval, sizeof(maskval)); | |
590 | if (!dolen) | |
591 | { | |
592 | close_conn(conn, WAIT_PLAIN, "websocket error: fault unpacking unmask key"); | |
593 | return; | |
594 | } | |
595 | } | |
596 | ||
597 | dolen = rb_rawbuf_get(conn->modbuf_in, msg, msglen); | |
598 | if (!dolen) | |
599 | { | |
600 | close_conn(conn, WAIT_PLAIN, "websocket error: fault unpacking message"); | |
601 | return; | |
602 | } | |
603 | ||
604 | if (masked) | |
605 | ws_frame_unmask(msg, dolen, maskval); | |
606 | ||
607 | rb_linebuf_parse(&conn->plainbuf_out, msg, dolen, 1); | |
608 | } | |
609 | ||
610 | static void | |
611 | conn_mod_process_huge(conn_t *conn, ws_frame_hdr_t *hdr, int masked) | |
612 | { | |
613 | /* XXX implement me */ | |
614 | } | |
615 | ||
616 | static void | |
617 | conn_mod_process(conn_t *conn) | |
618 | { | |
619 | ws_frame_hdr_t hdr; | |
620 | ||
621 | while (1) | |
622 | { | |
623 | int masked; | |
624 | int dolen = rb_rawbuf_get(conn->modbuf_in, &hdr, sizeof(hdr)); | |
625 | if (dolen != sizeof(hdr)) | |
626 | break; | |
627 | ||
628 | masked = (hdr.payload_length_mask >> 7) == 1; | |
629 | ||
630 | hdr.payload_length_mask &= 0x7f; | |
631 | switch (hdr.payload_length_mask) | |
632 | { | |
633 | case 126: | |
634 | conn_mod_process_large(conn, &hdr, masked); | |
635 | break; | |
636 | case 127: | |
637 | conn_mod_process_huge(conn, &hdr, masked); | |
638 | break; | |
639 | default: | |
640 | conn_mod_process_frame(conn, &hdr, masked); | |
641 | break; | |
642 | } | |
643 | } | |
c90e5c08 AC |
644 | |
645 | conn_plain_write_sendq(conn->plain_fd, conn); | |
d3f01ce7 AC |
646 | } |
647 | ||
1c8c63cb AC |
648 | static void |
649 | conn_mod_handshake_process(conn_t *conn) | |
650 | { | |
651 | char inbuf[READBUF_SIZE]; | |
652 | ||
e688bcbd AC |
653 | memset(inbuf, 0, sizeof inbuf); |
654 | ||
1c8c63cb AC |
655 | while (1) |
656 | { | |
1160f6c9 AC |
657 | char *p = NULL; |
658 | ||
e688bcbd | 659 | int dolen = rb_rawbuf_get(conn->modbuf_in, inbuf, sizeof inbuf); |
1c8c63cb AC |
660 | if (!dolen) |
661 | break; | |
1160f6c9 | 662 | |
f956cb0f | 663 | if ((p = rb_strcasestr(inbuf, "Sec-WebSocket-Key:")) != NULL) |
1160f6c9 AC |
664 | { |
665 | char *start, *end; | |
666 | ||
667 | start = p + strlen("Sec-WebSocket-Key:"); | |
668 | ||
669 | for (; start < (inbuf + READBUF_SIZE) && *start; start++) | |
670 | { | |
671 | if (*start != ' ' && *start != '\t') | |
672 | break; | |
673 | } | |
674 | ||
675 | for (end = start; end < (inbuf + READBUF_SIZE) && *end; end++) | |
676 | { | |
677 | if (*end == '\r' || *end == '\n') | |
678 | { | |
679 | *end = '\0'; | |
680 | break; | |
681 | } | |
682 | } | |
683 | ||
684 | rb_strlcpy(conn->client_key, start, sizeof(conn->client_key)); | |
685 | SetKeyed(conn); | |
686 | } | |
687 | } | |
688 | ||
689 | if (IsKeyed(conn)) | |
690 | { | |
691 | SHA1 sha1; | |
692 | uint8_t digest[SHA1_DIGEST_LENGTH]; | |
693 | char *resp; | |
694 | ||
695 | sha1_init(&sha1); | |
696 | sha1_update(&sha1, (uint8_t *) conn->client_key, strlen(conn->client_key)); | |
697 | sha1_update(&sha1, (uint8_t *) WEBSOCKET_SERVER_KEY, strlen(WEBSOCKET_SERVER_KEY)); | |
698 | sha1_final(&sha1, digest); | |
699 | ||
700 | resp = (char *) rb_base64_encode(digest, SHA1_DIGEST_LENGTH); | |
701 | ||
702 | conn_mod_write(conn, WEBSOCKET_ANSWER_STRING_1, strlen(WEBSOCKET_ANSWER_STRING_1)); | |
703 | conn_mod_write(conn, resp, strlen(resp)); | |
704 | conn_mod_write(conn, WEBSOCKET_ANSWER_STRING_2, strlen(WEBSOCKET_ANSWER_STRING_2)); | |
705 | ||
706 | rb_free(resp); | |
1c8c63cb | 707 | } |
1160f6c9 AC |
708 | |
709 | conn_mod_write_sendq(conn->mod_fd, conn); | |
1c8c63cb AC |
710 | } |
711 | ||
caebeeca | 712 | static void |
f297042b | 713 | conn_mod_read_cb(rb_fde_t *fd, void *data) |
05e0aa9a AC |
714 | { |
715 | char inbuf[READBUF_SIZE]; | |
e688bcbd AC |
716 | |
717 | memset(inbuf, 0, sizeof inbuf); | |
718 | ||
05e0aa9a AC |
719 | conn_t *conn = data; |
720 | int length = 0; | |
721 | if (conn == NULL) | |
722 | return; | |
723 | ||
724 | if (IsDead(conn)) | |
725 | return; | |
726 | ||
727 | while (1) | |
728 | { | |
729 | if (IsDead(conn)) | |
730 | return; | |
731 | ||
1c8c63cb AC |
732 | length = rb_read(fd, inbuf, sizeof(inbuf)); |
733 | ||
734 | if (length < 0) | |
735 | { | |
736 | if (rb_ignore_errno(errno)) | |
c90e5c08 | 737 | { |
f297042b | 738 | rb_setselect(fd, RB_SELECT_READ, conn_mod_read_cb, conn); |
c90e5c08 AC |
739 | conn_plain_write_sendq(conn->plain_fd, conn); |
740 | } | |
1c8c63cb AC |
741 | else |
742 | close_conn(conn, NO_WAIT, "Connection closed"); | |
743 | ||
744 | return; | |
745 | } | |
746 | else if (length == 0) | |
05e0aa9a AC |
747 | { |
748 | close_conn(conn, NO_WAIT, "Connection closed"); | |
749 | return; | |
750 | } | |
1c8c63cb | 751 | |
1160f6c9 | 752 | rb_rawbuf_append(conn->modbuf_in, inbuf, length); |
f297042b AC |
753 | if (!IsKeyed(conn)) |
754 | conn_mod_handshake_process(conn); | |
d3f01ce7 AC |
755 | else |
756 | conn_mod_process(conn); | |
1c8c63cb AC |
757 | |
758 | if (length < sizeof(inbuf)) | |
759 | { | |
f297042b | 760 | rb_setselect(fd, RB_SELECT_READ, conn_mod_read_cb, conn); |
1c8c63cb AC |
761 | return; |
762 | } | |
05e0aa9a AC |
763 | } |
764 | } | |
765 | ||
f297042b AC |
766 | static bool |
767 | plain_check_cork(conn_t * conn) | |
768 | { | |
769 | if(rb_rawbuf_length(conn->modbuf_out) >= 4096) | |
770 | { | |
771 | /* if we have over 4k pending outbound, don't read until | |
772 | * we've cleared the queue */ | |
773 | SetCork(conn); | |
774 | rb_setselect(conn->plain_fd, RB_SELECT_READ, NULL, NULL); | |
775 | /* try to write */ | |
e688bcbd AC |
776 | if (IsKeyed(conn)) |
777 | conn_mod_write_sendq(conn->mod_fd, conn); | |
f297042b AC |
778 | return true; |
779 | } | |
780 | ||
781 | return false; | |
782 | } | |
783 | ||
05e0aa9a | 784 | static void |
f297042b | 785 | conn_plain_process_recvq(conn_t *conn) |
05e0aa9a | 786 | { |
f297042b AC |
787 | char inbuf[READBUF_SIZE]; |
788 | ||
e688bcbd AC |
789 | memset(inbuf, 0, sizeof inbuf); |
790 | ||
f297042b AC |
791 | while (1) |
792 | { | |
e688bcbd | 793 | int dolen = rb_linebuf_get(&conn->plainbuf_in, inbuf, sizeof inbuf, LINEBUF_COMPLETE, LINEBUF_PARSED); |
f297042b AC |
794 | if (!dolen) |
795 | break; | |
796 | ||
797 | conn_mod_write_frame(conn, inbuf, dolen); | |
798 | } | |
e688bcbd AC |
799 | |
800 | if (IsKeyed(conn)) | |
801 | conn_mod_write_sendq(conn->mod_fd, conn); | |
05e0aa9a AC |
802 | } |
803 | ||
804 | static void | |
805 | conn_plain_read_cb(rb_fde_t *fd, void *data) | |
806 | { | |
f297042b | 807 | char inbuf[READBUF_SIZE]; |
e688bcbd AC |
808 | |
809 | memset(inbuf, 0, sizeof inbuf); | |
810 | ||
f297042b AC |
811 | conn_t *conn = data; |
812 | int length = 0; | |
813 | if(conn == NULL) | |
814 | return; | |
815 | ||
816 | if(IsDead(conn)) | |
817 | return; | |
818 | ||
819 | if(plain_check_cork(conn)) | |
820 | return; | |
821 | ||
822 | while(1) | |
823 | { | |
824 | if(IsDead(conn)) | |
825 | return; | |
826 | ||
827 | length = rb_read(conn->plain_fd, inbuf, sizeof(inbuf)); | |
828 | ||
829 | if(length == 0 || (length < 0 && !rb_ignore_errno(errno))) | |
830 | { | |
831 | close_conn(conn, NO_WAIT, NULL); | |
832 | return; | |
833 | } | |
834 | ||
835 | if(length < 0) | |
836 | { | |
837 | rb_setselect(conn->plain_fd, RB_SELECT_READ, conn_plain_read_cb, conn); | |
e688bcbd AC |
838 | if (IsKeyed(conn)) |
839 | conn_plain_process_recvq(conn); | |
f297042b AC |
840 | return; |
841 | } | |
842 | conn->plain_in += length; | |
843 | ||
7428c4e0 | 844 | (void) rb_linebuf_parse(&conn->plainbuf_in, inbuf, length, 0); |
f297042b AC |
845 | |
846 | if(IsDead(conn)) | |
847 | return; | |
848 | if(plain_check_cork(conn)) | |
849 | return; | |
850 | } | |
05e0aa9a AC |
851 | } |
852 | ||
853 | static void | |
854 | conn_plain_read_shutdown_cb(rb_fde_t *fd, void *data) | |
855 | { | |
856 | char inbuf[READBUF_SIZE]; | |
857 | conn_t *conn = data; | |
858 | int length = 0; | |
859 | ||
860 | if(conn == NULL) | |
861 | return; | |
862 | ||
863 | while(1) | |
864 | { | |
865 | length = rb_read(conn->plain_fd, inbuf, sizeof(inbuf)); | |
866 | ||
867 | if(length == 0 || (length < 0 && !rb_ignore_errno(errno))) | |
868 | { | |
869 | rb_close(conn->plain_fd); | |
870 | rb_dlinkAdd(conn, &conn->node, &dead_list); | |
871 | return; | |
872 | } | |
873 | ||
874 | if(length < 0) | |
875 | { | |
876 | rb_setselect(conn->plain_fd, RB_SELECT_READ, conn_plain_read_shutdown_cb, conn); | |
877 | return; | |
878 | } | |
879 | } | |
880 | } | |
881 | ||
882 | static void | |
883 | wsock_process(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb) | |
caebeeca AC |
884 | { |
885 | conn_t *conn; | |
886 | uint32_t id; | |
887 | ||
888 | conn = make_conn(ctl, ctlb->F[0], ctlb->F[1]); | |
889 | ||
890 | id = buf_to_uint32(&ctlb->buf[1]); | |
891 | conn_add_id_hash(conn, id); | |
892 | SetWS(conn); | |
893 | ||
894 | if(rb_get_type(conn->mod_fd) & RB_FD_UNKNOWN) | |
895 | rb_set_type(conn->mod_fd, RB_FD_SOCKET); | |
896 | ||
897 | if(rb_get_type(conn->plain_fd) == RB_FD_UNKNOWN) | |
898 | rb_set_type(conn->plain_fd, RB_FD_SOCKET); | |
899 | ||
f297042b | 900 | conn_mod_read_cb(conn->mod_fd, conn); |
e688bcbd | 901 | conn_plain_read_cb(conn->plain_fd, conn); |
caebeeca AC |
902 | } |
903 | ||
904 | static void | |
905 | mod_process_cmd_recv(mod_ctl_t * ctl) | |
906 | { | |
907 | rb_dlink_node *ptr, *next; | |
908 | mod_ctl_buf_t *ctl_buf; | |
909 | ||
910 | RB_DLINK_FOREACH_SAFE(ptr, next, ctl->readq.head) | |
911 | { | |
912 | ctl_buf = ptr->data; | |
913 | ||
914 | switch (*ctl_buf->buf) | |
915 | { | |
916 | case 'A': | |
917 | { | |
918 | if (ctl_buf->nfds != 2 || ctl_buf->buflen != 5) | |
919 | { | |
920 | cleanup_bad_message(ctl, ctl_buf); | |
921 | break; | |
922 | } | |
05e0aa9a | 923 | wsock_process(ctl, ctl_buf); |
caebeeca AC |
924 | break; |
925 | } | |
926 | default: | |
927 | break; | |
928 | /* Log unknown commands */ | |
929 | } | |
930 | rb_dlinkDelete(ptr, &ctl->readq); | |
931 | rb_free(ctl_buf->buf); | |
932 | rb_free(ctl_buf); | |
933 | } | |
934 | ||
935 | } | |
936 | ||
937 | static void | |
938 | mod_read_ctl(rb_fde_t *F, void *data) | |
939 | { | |
940 | mod_ctl_buf_t *ctl_buf; | |
941 | mod_ctl_t *ctl = data; | |
942 | int retlen; | |
943 | int i; | |
944 | ||
945 | do | |
946 | { | |
947 | ctl_buf = rb_malloc(sizeof(mod_ctl_buf_t)); | |
948 | ctl_buf->buf = rb_malloc(READBUF_SIZE); | |
949 | ctl_buf->buflen = READBUF_SIZE; | |
950 | retlen = rb_recv_fd_buf(ctl->F, ctl_buf->buf, ctl_buf->buflen, ctl_buf->F, | |
951 | MAXPASSFD); | |
952 | if(retlen <= 0) | |
953 | { | |
954 | rb_free(ctl_buf->buf); | |
955 | rb_free(ctl_buf); | |
956 | } | |
957 | else | |
958 | { | |
959 | ctl_buf->buflen = retlen; | |
960 | rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->readq); | |
961 | for (i = 0; i < MAXPASSFD && ctl_buf->F[i] != NULL; i++) | |
962 | ; | |
963 | ctl_buf->nfds = i; | |
964 | } | |
965 | } | |
966 | while(retlen > 0); | |
967 | ||
968 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
969 | exit(0); | |
970 | ||
971 | mod_process_cmd_recv(ctl); | |
972 | rb_setselect(ctl->F, RB_SELECT_READ, mod_read_ctl, ctl); | |
973 | } | |
974 | ||
caebeeca AC |
975 | static void |
976 | read_pipe_ctl(rb_fde_t *F, void *data) | |
977 | { | |
978 | char inbuf[READBUF_SIZE]; | |
979 | int retlen; | |
980 | while((retlen = rb_read(F, inbuf, sizeof(inbuf))) > 0) | |
981 | { | |
982 | ;; /* we don't do anything with the pipe really, just care if the other process dies.. */ | |
983 | } | |
984 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
985 | exit(0); | |
986 | rb_setselect(F, RB_SELECT_READ, read_pipe_ctl, NULL); | |
987 | } | |
988 | ||
989 | int | |
990 | main(int argc, char **argv) | |
991 | { | |
992 | const char *s_ctlfd, *s_pipe, *s_pid; | |
993 | int ctlfd, pipefd, x, maxfd; | |
994 | maxfd = maxconn(); | |
995 | ||
996 | s_ctlfd = getenv("CTL_FD"); | |
997 | s_pipe = getenv("CTL_PIPE"); | |
998 | s_pid = getenv("CTL_PPID"); | |
999 | ||
1000 | if(s_ctlfd == NULL || s_pipe == NULL || s_pid == NULL) | |
1001 | { | |
1002 | fprintf(stderr, | |
1003 | "This is the charybdis wsockd for internal ircd use.\n"); | |
1004 | fprintf(stderr, | |
1005 | "You aren't supposed to run me directly. Exiting.\n"); | |
1006 | exit(1); | |
1007 | } | |
1008 | ||
1009 | ctlfd = atoi(s_ctlfd); | |
1010 | pipefd = atoi(s_pipe); | |
1011 | ppid = atoi(s_pid); | |
1012 | x = 0; | |
1013 | #ifndef _WIN32 | |
1014 | for(x = 0; x < maxfd; x++) | |
1015 | { | |
1016 | if(x != ctlfd && x != pipefd && x > 2) | |
1017 | close(x); | |
1018 | } | |
1019 | x = open("/dev/null", O_RDWR); | |
1020 | ||
1021 | if(x >= 0) | |
1022 | { | |
1023 | if(ctlfd != 0 && pipefd != 0) | |
1024 | dup2(x, 0); | |
1025 | if(ctlfd != 1 && pipefd != 1) | |
1026 | dup2(x, 1); | |
1027 | if(ctlfd != 2 && pipefd != 2) | |
1028 | dup2(x, 2); | |
1029 | if(x > 2) | |
1030 | close(x); | |
1031 | } | |
1032 | #endif | |
1033 | setup_signals(); | |
1034 | rb_lib_init(NULL, NULL, NULL, 0, maxfd, 1024, 4096); | |
1c8c63cb | 1035 | rb_linebuf_init(4096); |
1160f6c9 | 1036 | rb_init_rawbuffers(4096); |
caebeeca AC |
1037 | |
1038 | mod_ctl = rb_malloc(sizeof(mod_ctl_t)); | |
1039 | mod_ctl->F = rb_open(ctlfd, RB_FD_SOCKET, "ircd control socket"); | |
1040 | mod_ctl->F_pipe = rb_open(pipefd, RB_FD_PIPE, "ircd pipe"); | |
1041 | rb_set_nb(mod_ctl->F); | |
1042 | rb_set_nb(mod_ctl->F_pipe); | |
1043 | rb_event_addish("clean_dead_conns", clean_dead_conns, NULL, 10); | |
1044 | read_pipe_ctl(mod_ctl->F_pipe, NULL); | |
1045 | mod_read_ctl(mod_ctl->F, mod_ctl); | |
1046 | ||
1047 | rb_lib_loop(0); | |
1048 | return 0; | |
1049 | } |