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1 | /* | |
2 | * ssld.c: The ircd-ratbox ssl/zlib helper daemon thingy | |
3 | * Copyright (C) 2007 Aaron Sethman <androsyn@ratbox.org> | |
4 | * Copyright (C) 2007 ircd-ratbox development team | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 | |
19 | * USA | |
20 | * | |
21 | * $Id: ssld.c 25594 2008-06-25 14:58:47Z androsyn $ | |
22 | */ | |
23 | ||
24 | ||
25 | #include "stdinc.h" | |
26 | ||
27 | #ifdef HAVE_LIBZ | |
28 | #include <zlib.h> | |
29 | #endif | |
30 | ||
31 | #define MAXPASSFD 4 | |
32 | #ifndef READBUF_SIZE | |
33 | #define READBUF_SIZE 16384 | |
34 | #endif | |
35 | ||
36 | static void setup_signals(void); | |
37 | ||
38 | static inline rb_int32_t buf_to_int32(char *buf) | |
39 | { | |
40 | rb_int32_t x; | |
41 | memcpy(&x, buf, sizeof(x)); | |
42 | return x; | |
43 | } | |
44 | ||
45 | static inline void int32_to_buf(char *buf, rb_int32_t x) | |
46 | { | |
47 | memcpy(buf, &x, sizeof(x)); | |
48 | return; | |
49 | } | |
50 | ||
51 | static inline rb_uint16_t buf_to_uint16(char *buf) | |
52 | { | |
53 | rb_uint16_t x; | |
54 | memcpy(&x, buf, sizeof(x)); | |
55 | return x; | |
56 | } | |
57 | ||
58 | static inline void uint16_to_buf(char *buf, rb_uint16_t x) | |
59 | { | |
60 | memcpy(buf, &x, sizeof(x)); | |
61 | return; | |
62 | } | |
63 | ||
64 | ||
65 | static char inbuf[READBUF_SIZE]; | |
66 | #ifdef HAVE_LIBZ | |
67 | static char outbuf[READBUF_SIZE]; | |
68 | #endif | |
69 | ||
70 | typedef struct _mod_ctl_buf | |
71 | { | |
72 | rb_dlink_node node; | |
73 | char *buf; | |
74 | size_t buflen; | |
75 | rb_fde_t *F[MAXPASSFD]; | |
76 | int nfds; | |
77 | } mod_ctl_buf_t; | |
78 | ||
79 | typedef struct _mod_ctl | |
80 | { | |
81 | rb_dlink_node node; | |
82 | int cli_count; | |
83 | rb_fde_t *F; | |
84 | rb_fde_t *F_pipe; | |
85 | rb_dlink_list readq; | |
86 | rb_dlink_list writeq; | |
87 | } mod_ctl_t; | |
88 | ||
89 | static mod_ctl_t *mod_ctl; | |
90 | ||
91 | ||
92 | #ifdef HAVE_LIBZ | |
93 | typedef struct _zlib_stream | |
94 | { | |
95 | z_stream instream; | |
96 | z_stream outstream; | |
97 | } zlib_stream_t; | |
98 | #endif | |
99 | ||
100 | typedef struct _conn | |
101 | { | |
102 | rb_dlink_node node; | |
103 | mod_ctl_t *ctl; | |
104 | rawbuf_head_t *modbuf_out; | |
105 | rawbuf_head_t *plainbuf_out; | |
106 | ||
107 | rb_int32_t id; | |
108 | ||
109 | rb_fde_t *mod_fd; | |
110 | rb_fde_t *plain_fd; | |
111 | unsigned long long mod_out; | |
112 | unsigned long long mod_in; | |
113 | unsigned long long plain_in; | |
114 | unsigned long long plain_out; | |
115 | rb_uint8_t flags; | |
116 | void *stream; | |
117 | } conn_t; | |
118 | ||
119 | #define FLAG_SSL 0x01 | |
120 | #define FLAG_ZIP 0x02 | |
121 | #define FLAG_CORK 0x04 | |
122 | #define FLAG_DEAD 0x08 | |
123 | #define FLAG_SSL_W_WANTS_R 0x10 /* output needs to wait until input possible */ | |
124 | #define FLAG_SSL_R_WANTS_W 0x20 /* input needs to wait until output possible */ | |
125 | ||
126 | #define IsSSL(x) ((x)->flags & FLAG_SSL) | |
127 | #define IsZip(x) ((x)->flags & FLAG_ZIP) | |
128 | #define IsCork(x) ((x)->flags & FLAG_CORK) | |
129 | #define IsDead(x) ((x)->flags & FLAG_DEAD) | |
130 | #define IsSSLWWantsR(x) ((x)->flags & FLAG_SSL_W_WANTS_R) | |
131 | #define IsSSLRWantsW(x) ((x)->flags & FLAG_SSL_R_WANTS_W) | |
132 | ||
133 | #define SetSSL(x) ((x)->flags |= FLAG_SSL) | |
134 | #define SetZip(x) ((x)->flags |= FLAG_ZIP) | |
135 | #define SetCork(x) ((x)->flags |= FLAG_CORK) | |
136 | #define SetDead(x) ((x)->flags |= FLAG_DEAD) | |
137 | #define SetSSLWWantsR(x) ((x)->flags |= FLAG_SSL_W_WANTS_R) | |
138 | #define SetSSLRWantsW(x) ((x)->flags |= FLAG_SSL_R_WANTS_W) | |
139 | ||
140 | #define ClearSSL(x) ((x)->flags &= ~FLAG_SSL) | |
141 | #define ClearZip(x) ((x)->flags &= ~FLAG_ZIP) | |
142 | #define ClearCork(x) ((x)->flags &= ~FLAG_CORK) | |
143 | #define ClearDead(x) ((x)->flags &= ~FLAG_DEAD) | |
144 | #define ClearSSLWWantsR(x) ((x)->flags &= ~FLAG_SSL_W_WANTS_R) | |
145 | #define ClearSSLRWantsW(x) ((x)->flags &= ~FLAG_SSL_R_WANTS_W) | |
146 | ||
147 | #define NO_WAIT 0x0 | |
148 | #define WAIT_PLAIN 0x1 | |
149 | ||
150 | #define HASH_WALK_SAFE(i, max, ptr, next, table) for(i = 0; i < max; i++) { RB_DLINK_FOREACH_SAFE(ptr, next, table[i].head) | |
151 | #define HASH_WALK_END } | |
152 | #define CONN_HASH_SIZE 2000 | |
153 | #define connid_hash(x) (&connid_hash_table[(x % CONN_HASH_SIZE)]) | |
154 | ||
155 | ||
156 | ||
157 | static rb_dlink_list connid_hash_table[CONN_HASH_SIZE]; | |
158 | static rb_dlink_list dead_list; | |
159 | ||
160 | static void conn_mod_read_cb(rb_fde_t * fd, void *data); | |
161 | static void conn_mod_write_sendq(rb_fde_t *, void *data); | |
162 | static void conn_plain_write_sendq(rb_fde_t *, void *data); | |
163 | static void mod_write_ctl(rb_fde_t *, void *data); | |
164 | static void conn_plain_read_cb(rb_fde_t * fd, void *data); | |
165 | static void mod_cmd_write_queue(mod_ctl_t *ctl, const void *data, size_t len); | |
166 | static const char *remote_closed = "Remote host closed the connection"; | |
167 | static int ssl_ok; | |
168 | #ifdef HAVE_LIBZ | |
169 | static int zlib_ok = 1; | |
170 | #else | |
171 | static int zlib_ok = 0; | |
172 | #endif | |
173 | ||
174 | ||
175 | #ifdef HAVE_LIBZ | |
176 | static void * | |
177 | ssld_alloc(void *unused, size_t count, size_t size) | |
178 | { | |
179 | return rb_malloc(count * size); | |
180 | } | |
181 | ||
182 | static void | |
183 | ssld_free(void *unused, void *ptr) | |
184 | { | |
185 | rb_free(ptr); | |
186 | } | |
187 | #endif | |
188 | ||
189 | static conn_t * | |
190 | conn_find_by_id(rb_int32_t id) | |
191 | { | |
192 | rb_dlink_node *ptr; | |
193 | conn_t *conn; | |
194 | ||
195 | RB_DLINK_FOREACH(ptr, (connid_hash(id))->head) | |
196 | { | |
197 | conn = ptr->data; | |
198 | if(conn->id == id && !IsDead(conn)) | |
199 | return conn; | |
200 | } | |
201 | return NULL; | |
202 | } | |
203 | ||
204 | static void | |
205 | conn_add_id_hash(conn_t * conn, rb_int32_t id) | |
206 | { | |
207 | conn->id = id; | |
208 | rb_dlinkAdd(conn, &conn->node, connid_hash(id)); | |
209 | } | |
210 | ||
211 | static void | |
212 | free_conn(conn_t * conn) | |
213 | { | |
214 | rb_free_rawbuffer(conn->modbuf_out); | |
215 | rb_free_rawbuffer(conn->plainbuf_out); | |
216 | #ifdef HAVE_LIBZ | |
217 | if(IsZip(conn)) | |
218 | { | |
219 | zlib_stream_t *stream = conn->stream; | |
220 | inflateEnd(&stream->instream); | |
221 | deflateEnd(&stream->outstream); | |
222 | } | |
223 | #endif | |
224 | rb_free(conn); | |
225 | } | |
226 | ||
227 | static void | |
228 | clean_dead_conns(void *unused) | |
229 | { | |
230 | conn_t *conn; | |
231 | rb_dlink_node *ptr, *next; | |
232 | RB_DLINK_FOREACH_SAFE(ptr, next, dead_list.head) | |
233 | { | |
234 | conn = ptr->data; | |
235 | free_conn(conn); | |
236 | } | |
237 | dead_list.tail = dead_list.head = NULL; | |
238 | } | |
239 | ||
240 | ||
241 | static void | |
242 | close_conn(conn_t * conn, int wait_plain, const char *fmt, ...) | |
243 | { | |
244 | va_list ap; | |
245 | char reason[128]; /* must always be under 250 bytes */ | |
246 | char buf[256]; | |
247 | int len; | |
248 | if(IsDead(conn)) | |
249 | return; | |
250 | ||
251 | rb_rawbuf_flush(conn->modbuf_out, conn->mod_fd); | |
252 | rb_rawbuf_flush(conn->plainbuf_out, conn->plain_fd); | |
253 | rb_close(conn->mod_fd); | |
254 | SetDead(conn); | |
255 | ||
256 | if(!wait_plain || fmt == NULL) | |
257 | { | |
258 | rb_close(conn->plain_fd); | |
259 | ||
260 | if(conn->id >= 0) | |
261 | rb_dlinkDelete(&conn->node, connid_hash(conn->id)); | |
262 | rb_dlinkAdd(conn, &conn->node, &dead_list); | |
263 | return; | |
264 | } | |
265 | rb_setselect(conn->plain_fd, RB_SELECT_WRITE|RB_SELECT_READ, NULL, NULL); | |
266 | va_start(ap, fmt); | |
267 | rb_vsnprintf(reason, sizeof(reason), fmt, ap); | |
268 | va_end(ap); | |
269 | ||
270 | buf[0] = 'D'; | |
271 | int32_to_buf(&buf[1], conn->id); | |
272 | strcpy(&buf[5], reason); | |
273 | len = (strlen(reason) + 1) + 5; | |
274 | mod_cmd_write_queue(conn->ctl, buf, len); | |
275 | } | |
276 | ||
277 | static conn_t * | |
278 | make_conn(mod_ctl_t *ctl, rb_fde_t * mod_fd, rb_fde_t * plain_fd) | |
279 | { | |
280 | conn_t *conn = rb_malloc(sizeof(conn_t)); | |
281 | conn->ctl = ctl; | |
282 | conn->modbuf_out = rb_new_rawbuffer(); | |
283 | conn->plainbuf_out = rb_new_rawbuffer(); | |
284 | conn->mod_fd = mod_fd; | |
285 | conn->plain_fd = plain_fd; | |
286 | conn->id = -1; | |
287 | conn->stream = NULL; | |
288 | rb_set_nb(mod_fd); | |
289 | rb_set_nb(plain_fd); | |
290 | return conn; | |
291 | } | |
292 | ||
293 | static void | |
294 | check_handshake_flood(void *unused) | |
295 | { | |
296 | conn_t *conn; | |
297 | rb_dlink_node *ptr, *next; | |
298 | unsigned int count; | |
299 | int i; | |
300 | HASH_WALK_SAFE(i, CONN_HASH_SIZE, ptr, next, connid_hash_table) | |
301 | { | |
302 | conn = ptr->data; | |
303 | if(!IsSSL(conn)) | |
304 | continue; | |
305 | ||
306 | count = rb_ssl_handshake_count(conn->mod_fd); | |
307 | /* nothing needs to do this more than twice in ten seconds i don't think */ | |
308 | if(count > 2) | |
309 | close_conn(conn, WAIT_PLAIN, "Handshake flooding"); | |
310 | else | |
311 | rb_ssl_clear_handshake_count(conn->mod_fd); | |
312 | } | |
313 | HASH_WALK_END | |
314 | ||
315 | } | |
316 | ||
317 | static void | |
318 | conn_mod_write_sendq(rb_fde_t * fd, void *data) | |
319 | { | |
320 | conn_t *conn = data; | |
321 | const char *err; | |
322 | int retlen; | |
323 | if(IsDead(conn)) | |
324 | return; | |
325 | ||
326 | if(IsSSLWWantsR(conn)) | |
327 | { | |
328 | ClearSSLWWantsR(conn); | |
329 | conn_mod_read_cb(conn->mod_fd, conn); | |
330 | if(IsDead(conn)) | |
331 | return; | |
332 | } | |
333 | ||
334 | while ((retlen = rb_rawbuf_flush(conn->modbuf_out, fd)) > 0) | |
335 | conn->mod_out += retlen; | |
336 | ||
337 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
338 | { | |
339 | if(retlen == 0) | |
340 | close_conn(conn, WAIT_PLAIN, "%s", remote_closed); | |
341 | if(IsSSL(conn) && retlen == RB_RW_SSL_ERROR) | |
342 | err = rb_get_ssl_strerror(conn->mod_fd); | |
343 | else | |
344 | err = strerror(errno); | |
345 | close_conn(conn, WAIT_PLAIN, "Write error: %s", err); | |
346 | return; | |
347 | } | |
348 | if(rb_rawbuf_length(conn->modbuf_out) > 0) | |
349 | { | |
350 | if(retlen != RB_RW_SSL_NEED_READ) | |
351 | rb_setselect(conn->mod_fd, RB_SELECT_WRITE, conn_mod_write_sendq, conn); | |
352 | else | |
353 | { | |
354 | rb_setselect(conn->mod_fd, RB_SELECT_READ, conn_mod_write_sendq, conn); | |
355 | rb_setselect(conn->mod_fd, RB_SELECT_WRITE, NULL, NULL); | |
356 | SetSSLWWantsR(conn); | |
357 | } | |
358 | } | |
359 | else | |
360 | rb_setselect(conn->mod_fd, RB_SELECT_WRITE, NULL, NULL); | |
361 | ||
362 | if(IsCork(conn) && rb_rawbuf_length(conn->modbuf_out) == 0) | |
363 | { | |
364 | ClearCork(conn); | |
365 | conn_plain_read_cb(conn->plain_fd, conn); | |
366 | } | |
367 | ||
368 | } | |
369 | ||
370 | static void | |
371 | conn_mod_write(conn_t * conn, void *data, size_t len) | |
372 | { | |
373 | if(IsDead(conn)) /* no point in queueing to a dead man */ | |
374 | return; | |
375 | rb_rawbuf_append(conn->modbuf_out, data, len); | |
376 | } | |
377 | ||
378 | static void | |
379 | conn_plain_write(conn_t * conn, void *data, size_t len) | |
380 | { | |
381 | if(IsDead(conn)) /* again no point in queueing to dead men */ | |
382 | return; | |
383 | rb_rawbuf_append(conn->plainbuf_out, data, len); | |
384 | } | |
385 | ||
386 | static void | |
387 | mod_cmd_write_queue(mod_ctl_t * ctl, const void *data, size_t len) | |
388 | { | |
389 | mod_ctl_buf_t *ctl_buf; | |
390 | ctl_buf = rb_malloc(sizeof(mod_ctl_buf_t)); | |
391 | ctl_buf->buf = rb_malloc(len); | |
392 | ctl_buf->buflen = len; | |
393 | memcpy(ctl_buf->buf, data, len); | |
394 | ctl_buf->nfds = 0; | |
395 | rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->writeq); | |
396 | mod_write_ctl(ctl->F, ctl); | |
397 | } | |
398 | ||
399 | #ifdef HAVE_LIBZ | |
400 | static void | |
401 | common_zlib_deflate(conn_t * conn, void *buf, size_t len) | |
402 | { | |
403 | int ret, have; | |
404 | z_stream *outstream = &((zlib_stream_t *)conn->stream)->outstream; | |
405 | outstream->next_in = buf; | |
406 | outstream->avail_in = len; | |
407 | outstream->next_out = (Bytef *) outbuf; | |
408 | outstream->avail_out = sizeof(outbuf); | |
409 | ||
410 | ret = deflate(outstream, Z_SYNC_FLUSH); | |
411 | if(ret != Z_OK) | |
412 | { | |
413 | /* deflate error */ | |
414 | close_conn(conn, WAIT_PLAIN, "Deflate failed: %s", zError(ret)); | |
415 | return; | |
416 | } | |
417 | if(outstream->avail_out == 0) | |
418 | { | |
419 | /* avail_out empty */ | |
420 | close_conn(conn, WAIT_PLAIN, "error compressing data, avail_out == 0"); | |
421 | return; | |
422 | } | |
423 | if(outstream->avail_in != 0) | |
424 | { | |
425 | /* avail_in isn't empty...*/ | |
426 | close_conn(conn, WAIT_PLAIN, "error compressing data, avail_in != 0"); | |
427 | return; | |
428 | } | |
429 | have = sizeof(outbuf) - outstream->avail_out; | |
430 | conn_mod_write(conn, outbuf, have); | |
431 | } | |
432 | ||
433 | static void | |
434 | common_zlib_inflate(conn_t * conn, void *buf, size_t len) | |
435 | { | |
436 | int ret, have; | |
437 | ((zlib_stream_t *)conn->stream)->instream.next_in = buf; | |
438 | ((zlib_stream_t *)conn->stream)->instream.avail_in = len; | |
439 | ((zlib_stream_t *)conn->stream)->instream.next_out = (Bytef *) outbuf; | |
440 | ((zlib_stream_t *)conn->stream)->instream.avail_out = sizeof(outbuf); | |
441 | ||
442 | while (((zlib_stream_t *)conn->stream)->instream.avail_in) | |
443 | { | |
444 | ret = inflate(&((zlib_stream_t *)conn->stream)->instream, Z_NO_FLUSH); | |
445 | if(ret != Z_OK) | |
446 | { | |
447 | if(!strncmp("ERROR ", buf, 6)) | |
448 | { | |
449 | close_conn(conn, WAIT_PLAIN, "Received uncompressed ERROR"); | |
450 | return; | |
451 | } | |
452 | close_conn(conn, WAIT_PLAIN, "Inflate failed: %s", zError(ret)); | |
453 | return; | |
454 | } | |
455 | have = sizeof(outbuf) - ((zlib_stream_t *)conn->stream)->instream.avail_out; | |
456 | ||
457 | if(((zlib_stream_t *)conn->stream)->instream.avail_in) | |
458 | { | |
459 | conn_plain_write(conn, outbuf, have); | |
460 | have = 0; | |
461 | ((zlib_stream_t *)conn->stream)->instream.next_out = (Bytef *) outbuf; | |
462 | ((zlib_stream_t *)conn->stream)->instream.avail_out = sizeof(outbuf); | |
463 | } | |
464 | } | |
465 | if(have == 0) | |
466 | return; | |
467 | ||
468 | conn_plain_write(conn, outbuf, have); | |
469 | } | |
470 | #endif | |
471 | ||
472 | static int | |
473 | plain_check_cork(conn_t * conn) | |
474 | { | |
475 | if(rb_rawbuf_length(conn->modbuf_out) >= 4096) | |
476 | { | |
477 | /* if we have over 4k pending outbound, don't read until | |
478 | * we've cleared the queue */ | |
479 | SetCork(conn); | |
480 | rb_setselect(conn->plain_fd, RB_SELECT_READ, NULL, NULL); | |
481 | /* try to write */ | |
482 | conn_mod_write_sendq(conn->mod_fd, conn); | |
483 | return 1; | |
484 | } | |
485 | return 0; | |
486 | } | |
487 | ||
488 | ||
489 | static void | |
490 | conn_plain_read_cb(rb_fde_t * fd, void *data) | |
491 | { | |
492 | conn_t *conn = data; | |
493 | int length = 0; | |
494 | if(conn == NULL) | |
495 | return; | |
496 | ||
497 | if(IsDead(conn)) | |
498 | return; | |
499 | ||
500 | if(plain_check_cork(conn)) | |
501 | return; | |
502 | ||
503 | while (1) | |
504 | { | |
505 | if(IsDead(conn)) | |
506 | return; | |
507 | ||
508 | length = rb_read(conn->plain_fd, inbuf, sizeof(inbuf)); | |
509 | ||
510 | if(length == 0 || (length < 0 && !rb_ignore_errno(errno))) | |
511 | { | |
512 | close_conn(conn, NO_WAIT, NULL); | |
513 | return; | |
514 | } | |
515 | ||
516 | if(length < 0) | |
517 | { | |
518 | rb_setselect(conn->plain_fd, RB_SELECT_READ, conn_plain_read_cb, conn); | |
519 | conn_mod_write_sendq(conn->mod_fd, conn); | |
520 | return; | |
521 | } | |
522 | conn->plain_in += length; | |
523 | ||
524 | #ifdef HAVE_LIBZ | |
525 | if(IsZip(conn)) | |
526 | common_zlib_deflate(conn, inbuf, length); | |
527 | else | |
528 | #endif | |
529 | conn_mod_write(conn, inbuf, length); | |
530 | if(IsDead(conn)) | |
531 | return; | |
532 | if(plain_check_cork(conn)) | |
533 | return; | |
534 | } | |
535 | } | |
536 | ||
537 | static void | |
538 | conn_mod_read_cb(rb_fde_t * fd, void *data) | |
539 | { | |
540 | conn_t *conn = data; | |
541 | const char *err = remote_closed; | |
542 | int length; | |
543 | if(conn == NULL) | |
544 | return; | |
545 | if(IsDead(conn)) | |
546 | return; | |
547 | ||
548 | if(IsSSLRWantsW(conn)) | |
549 | { | |
550 | ClearSSLRWantsW(conn); | |
551 | conn_mod_write_sendq(conn->mod_fd, conn); | |
552 | if(IsDead(conn)) | |
553 | return; | |
554 | } | |
555 | ||
556 | while (1) | |
557 | { | |
558 | if(IsDead(conn)) | |
559 | return; | |
560 | ||
561 | length = rb_read(conn->mod_fd, inbuf, sizeof(inbuf)); | |
562 | ||
563 | if(length == 0 || (length < 0 && !rb_ignore_errno(errno))) | |
564 | { | |
565 | if(length == 0) { | |
566 | close_conn(conn, WAIT_PLAIN, "%s", remote_closed); | |
567 | return; | |
568 | } | |
569 | ||
570 | if(IsSSL(conn) && length == RB_RW_SSL_ERROR) | |
571 | err = rb_get_ssl_strerror(conn->mod_fd); | |
572 | else | |
573 | err = strerror(errno); | |
574 | close_conn(conn, WAIT_PLAIN, "Read error: %s", err); | |
575 | return; | |
576 | } | |
577 | if(length < 0) | |
578 | { | |
579 | if(length != RB_RW_SSL_NEED_WRITE) | |
580 | rb_setselect(conn->mod_fd, RB_SELECT_READ, conn_mod_read_cb, conn); | |
581 | else | |
582 | { | |
583 | rb_setselect(conn->mod_fd, RB_SELECT_READ, NULL, NULL); | |
584 | rb_setselect(conn->mod_fd, RB_SELECT_WRITE, conn_mod_read_cb, conn); | |
585 | SetSSLRWantsW(conn); | |
586 | } | |
587 | conn_plain_write_sendq(conn->plain_fd, conn); | |
588 | return; | |
589 | } | |
590 | conn->mod_in += length; | |
591 | #ifdef HAVE_LIBZ | |
592 | if(IsZip(conn)) | |
593 | common_zlib_inflate(conn, inbuf, length); | |
594 | else | |
595 | #endif | |
596 | conn_plain_write(conn, inbuf, length); | |
597 | } | |
598 | } | |
599 | ||
600 | static void | |
601 | conn_plain_write_sendq(rb_fde_t * fd, void *data) | |
602 | { | |
603 | conn_t *conn = data; | |
604 | int retlen; | |
605 | ||
606 | if(IsDead(conn)) | |
607 | return; | |
608 | ||
609 | while ((retlen = rb_rawbuf_flush(conn->plainbuf_out, fd)) > 0) | |
610 | { | |
611 | conn->plain_out += retlen; | |
612 | } | |
613 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
614 | { | |
615 | close_conn(data, NO_WAIT, NULL); | |
616 | return; | |
617 | } | |
618 | ||
619 | ||
620 | if(rb_rawbuf_length(conn->plainbuf_out) > 0) | |
621 | rb_setselect(conn->plain_fd, RB_SELECT_WRITE, conn_plain_write_sendq, conn); | |
622 | else | |
623 | rb_setselect(conn->plain_fd, RB_SELECT_WRITE, NULL, NULL); | |
624 | } | |
625 | ||
626 | static int | |
627 | maxconn(void) | |
628 | { | |
629 | #if defined(RLIMIT_NOFILE) && defined(HAVE_SYS_RESOURCE_H) | |
630 | struct rlimit limit; | |
631 | ||
632 | if(!getrlimit(RLIMIT_NOFILE, &limit)) | |
633 | { | |
634 | return limit.rlim_cur; | |
635 | } | |
636 | #endif /* RLIMIT_FD_MAX */ | |
637 | return MAXCONNECTIONS; | |
638 | } | |
639 | ||
640 | static void | |
641 | ssl_process_accept_cb(rb_fde_t * F, int status, struct sockaddr *addr, rb_socklen_t len, void *data) | |
642 | { | |
643 | conn_t *conn = data; | |
644 | if(status == RB_OK) | |
645 | { | |
646 | conn_mod_read_cb(conn->mod_fd, conn); | |
647 | conn_plain_read_cb(conn->plain_fd, conn); | |
648 | return; | |
649 | } | |
650 | close_conn(conn, NO_WAIT, 0); | |
651 | return; | |
652 | } | |
653 | ||
654 | static void | |
655 | ssl_process_connect_cb(rb_fde_t * F, int status, void *data) | |
656 | { | |
657 | conn_t *conn = data; | |
658 | if(status == RB_OK) | |
659 | { | |
660 | conn_mod_read_cb(conn->mod_fd, conn); | |
661 | conn_plain_read_cb(conn->plain_fd, conn); | |
662 | return; | |
663 | } | |
664 | close_conn(conn, NO_WAIT, 0); | |
665 | return; | |
666 | } | |
667 | ||
668 | ||
669 | static void | |
670 | ssl_process_accept(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb) | |
671 | { | |
672 | conn_t *conn; | |
673 | rb_int32_t id; | |
674 | ||
675 | conn = make_conn(ctl, ctlb->F[0], ctlb->F[1]); | |
676 | ||
677 | id = buf_to_int32(&ctlb->buf[1]); | |
678 | ||
679 | if(id >= 0) | |
680 | conn_add_id_hash(conn, id); | |
681 | SetSSL(conn); | |
682 | ||
683 | if(rb_get_type(conn->mod_fd) & RB_FD_UNKNOWN) | |
684 | { | |
685 | ||
686 | rb_set_type(conn->mod_fd, RB_FD_SOCKET); | |
687 | } | |
688 | if(rb_get_type(conn->mod_fd) == RB_FD_UNKNOWN) | |
689 | rb_set_type(conn->plain_fd, RB_FD_SOCKET); | |
690 | ||
691 | rb_ssl_start_accepted(ctlb->F[0], ssl_process_accept_cb, conn, 10); | |
692 | } | |
693 | ||
694 | static void | |
695 | ssl_process_connect(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb) | |
696 | { | |
697 | conn_t *conn; | |
698 | rb_int32_t id; | |
699 | conn = make_conn(ctl, ctlb->F[0], ctlb->F[1]); | |
700 | ||
701 | id = buf_to_int32(&ctlb->buf[1]); | |
702 | ||
703 | if(id >= 0) | |
704 | conn_add_id_hash(conn, id); | |
705 | SetSSL(conn); | |
706 | ||
707 | if(rb_get_type(conn->mod_fd) == RB_FD_UNKNOWN) | |
708 | rb_set_type(conn->mod_fd, RB_FD_SOCKET); | |
709 | ||
710 | if(rb_get_type(conn->mod_fd) == RB_FD_UNKNOWN) | |
711 | rb_set_type(conn->plain_fd, RB_FD_SOCKET); | |
712 | ||
713 | ||
714 | rb_ssl_start_connected(ctlb->F[0], ssl_process_connect_cb, conn, 10); | |
715 | } | |
716 | ||
717 | static void | |
718 | process_stats(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb) | |
719 | { | |
720 | char outstat[512]; | |
721 | conn_t *conn; | |
722 | const char *odata; | |
723 | rb_int32_t id; | |
724 | ||
725 | id = buf_to_int32(&ctlb->buf[1]); | |
726 | ||
727 | if(id < 0) | |
728 | return; | |
729 | ||
730 | odata = &ctlb->buf[5]; | |
731 | conn = conn_find_by_id(id); | |
732 | ||
733 | if(conn == NULL) | |
734 | return; | |
735 | ||
736 | rb_snprintf(outstat, sizeof(outstat), "S %s %llu %llu %llu %llu", odata, | |
737 | conn->plain_out, conn->mod_in, conn->plain_in, conn->mod_out); | |
738 | conn->plain_out = 0; | |
739 | conn->plain_in = 0; | |
740 | conn->mod_in = 0; | |
741 | conn->mod_out = 0; | |
742 | mod_cmd_write_queue(ctl, outstat, strlen(outstat) + 1); /* +1 is so we send the \0 as well */ | |
743 | } | |
744 | ||
745 | #ifdef HAVE_LIBZ | |
746 | static void | |
747 | zlib_send_zip_ready(mod_ctl_t *ctl, conn_t *conn) | |
748 | { | |
749 | char buf[5]; | |
750 | ||
751 | buf[0] = 'R'; | |
752 | int32_to_buf(&buf[1], conn->id); | |
753 | mod_cmd_write_queue(conn->ctl, buf, sizeof(buf)); | |
754 | } | |
755 | ||
756 | static void | |
757 | zlib_process(mod_ctl_t * ctl, mod_ctl_buf_t * ctlb) | |
758 | { | |
759 | rb_uint8_t level; | |
760 | size_t recvqlen; | |
761 | size_t hdr = (sizeof(rb_uint8_t) * 2) + sizeof(rb_int32_t); | |
762 | void *recvq_start; | |
763 | z_stream *instream, *outstream; | |
764 | conn_t *conn; | |
765 | rb_int32_t id; | |
766 | ||
767 | conn = make_conn(ctl, ctlb->F[0], ctlb->F[1]); | |
768 | if(rb_get_type(conn->mod_fd) == RB_FD_UNKNOWN) | |
769 | rb_set_type(conn->mod_fd, RB_FD_SOCKET); | |
770 | ||
771 | if(rb_get_type(conn->plain_fd) == RB_FD_UNKNOWN) | |
772 | rb_set_type(conn->plain_fd, RB_FD_SOCKET); | |
773 | ||
774 | id = buf_to_int32(&ctlb->buf[1]); | |
775 | conn_add_id_hash(conn, id); | |
776 | ||
777 | level = (rb_uint8_t) ctlb->buf[5]; | |
778 | ||
779 | recvqlen = ctlb->buflen - hdr; | |
780 | recvq_start = &ctlb->buf[6]; | |
781 | ||
782 | SetZip(conn); | |
783 | conn->stream = rb_malloc(sizeof(zlib_stream_t)); | |
784 | instream = &((zlib_stream_t *)conn->stream)->instream; | |
785 | outstream = &((zlib_stream_t *)conn->stream)->outstream; | |
786 | ||
787 | instream->total_in = 0; | |
788 | instream->total_out = 0; | |
789 | instream->zalloc = (alloc_func) ssld_alloc; | |
790 | instream->zfree = (free_func) ssld_free; | |
791 | instream->data_type = Z_ASCII; | |
792 | inflateInit(&((zlib_stream_t *)conn->stream)->instream); | |
793 | ||
794 | outstream->total_in = 0; | |
795 | outstream->total_out = 0; | |
796 | outstream->zalloc = (alloc_func) ssld_alloc; | |
797 | outstream->zfree = (free_func) ssld_free; | |
798 | outstream->data_type = Z_ASCII; | |
799 | ||
800 | if(level > 9) | |
801 | level = Z_DEFAULT_COMPRESSION; | |
802 | ||
803 | deflateInit(&((zlib_stream_t *)conn->stream)->outstream, level); | |
804 | if(recvqlen > 0) | |
805 | common_zlib_inflate(conn, recvq_start, recvqlen); | |
806 | zlib_send_zip_ready(ctl, conn); | |
807 | conn_mod_read_cb(conn->mod_fd, conn); | |
808 | conn_plain_read_cb(conn->plain_fd, conn); | |
809 | return; | |
810 | ||
811 | } | |
812 | #endif | |
813 | ||
814 | static void | |
815 | init_prng(mod_ctl_t * ctl, mod_ctl_buf_t * ctl_buf) | |
816 | { | |
817 | char *path; | |
818 | prng_seed_t seed_type; | |
819 | ||
820 | seed_type = (prng_seed_t)ctl_buf->buf[1]; | |
821 | path = &ctl_buf->buf[2]; | |
822 | rb_init_prng(path, seed_type); | |
823 | } | |
824 | ||
825 | ||
826 | static void | |
827 | ssl_new_keys(mod_ctl_t * ctl, mod_ctl_buf_t * ctl_buf) | |
828 | { | |
829 | char *buf; | |
830 | char *cert, *key, *dhparam; | |
831 | ||
832 | buf = &ctl_buf->buf[2]; | |
833 | cert = buf; | |
834 | buf += strlen(cert) + 1; | |
835 | key = buf; | |
836 | buf += strlen(key) + 1; | |
837 | dhparam = buf; | |
838 | if(strlen(dhparam) == 0) | |
839 | dhparam = NULL; | |
840 | ||
841 | if(!rb_setup_ssl_server(cert, key, dhparam)) | |
842 | { | |
843 | const char *invalid = "I"; | |
844 | mod_cmd_write_queue(ctl, invalid, strlen(invalid)); | |
845 | return; | |
846 | } | |
847 | } | |
848 | ||
849 | static void | |
850 | send_nossl_support(mod_ctl_t *ctl, mod_ctl_buf_t *ctlb) | |
851 | { | |
852 | static const char *nossl_cmd = "N"; | |
853 | conn_t *conn; | |
854 | rb_int32_t id; | |
855 | ||
856 | if(ctlb != NULL) | |
857 | { | |
858 | conn = make_conn(ctl, ctlb->F[0], ctlb->F[1]); | |
859 | id = buf_to_int32(&ctlb->buf[1]); | |
860 | ||
861 | if(id >= 0) | |
862 | conn_add_id_hash(conn, id); | |
863 | close_conn(conn, WAIT_PLAIN, "libratbox reports no SSL/TLS support"); | |
864 | } | |
865 | mod_cmd_write_queue(ctl, nossl_cmd, strlen(nossl_cmd)); | |
866 | } | |
867 | ||
868 | static void | |
869 | send_i_am_useless(mod_ctl_t *ctl) | |
870 | { | |
871 | static const char *useless = "U"; | |
872 | mod_cmd_write_queue(ctl, useless, strlen(useless)); | |
873 | } | |
874 | ||
875 | static void | |
876 | send_nozlib_support(mod_ctl_t *ctl, mod_ctl_buf_t *ctlb) | |
877 | { | |
878 | static const char *nozlib_cmd = "z"; | |
879 | conn_t *conn; | |
880 | rb_int32_t id; | |
881 | if(ctlb != NULL) | |
882 | { | |
883 | conn = make_conn(ctl, ctlb->F[0], ctlb->F[1]); | |
884 | id = buf_to_int32(&ctlb->buf[1]); | |
885 | ||
886 | if(id >= 0) | |
887 | conn_add_id_hash(conn, id); | |
888 | close_conn(conn, WAIT_PLAIN, "libratbox reports no zlib support"); | |
889 | } | |
890 | mod_cmd_write_queue(ctl, nozlib_cmd, strlen(nozlib_cmd)); | |
891 | } | |
892 | ||
893 | static void | |
894 | mod_process_cmd_recv(mod_ctl_t * ctl) | |
895 | { | |
896 | rb_dlink_node *ptr, *next; | |
897 | mod_ctl_buf_t *ctl_buf; | |
898 | ||
899 | RB_DLINK_FOREACH_SAFE(ptr, next, ctl->readq.head) | |
900 | { | |
901 | ctl_buf = ptr->data; | |
902 | ||
903 | switch (*ctl_buf->buf) | |
904 | { | |
905 | case 'A': | |
906 | { | |
907 | if(!ssl_ok) | |
908 | { | |
909 | send_nossl_support(ctl, ctl_buf); | |
910 | break; | |
911 | } | |
912 | ssl_process_accept(ctl, ctl_buf); | |
913 | break; | |
914 | } | |
915 | case 'C': | |
916 | { | |
917 | if(!ssl_ok) | |
918 | { | |
919 | send_nossl_support(ctl, ctl_buf); | |
920 | break; | |
921 | } | |
922 | ssl_process_connect(ctl, ctl_buf); | |
923 | break; | |
924 | } | |
925 | ||
926 | case 'K': | |
927 | { | |
928 | if(!ssl_ok) | |
929 | { | |
930 | send_nossl_support(ctl, ctl_buf); | |
931 | break; | |
932 | } | |
933 | ssl_new_keys(ctl, ctl_buf); | |
934 | break; | |
935 | } | |
936 | case 'I': | |
937 | init_prng(ctl, ctl_buf); | |
938 | break; | |
939 | case 'S': | |
940 | { | |
941 | process_stats(ctl, ctl_buf); | |
942 | break; | |
943 | } | |
944 | #ifdef HAVE_LIBZ | |
945 | case 'Z': | |
946 | { | |
947 | /* just zlib only */ | |
948 | zlib_process(ctl, ctl_buf); | |
949 | break; | |
950 | } | |
951 | #else | |
952 | case 'Y': | |
953 | case 'Z': | |
954 | send_nozlib_support(ctl, ctl_buf); | |
955 | break; | |
956 | ||
957 | #endif | |
958 | default: | |
959 | break; | |
960 | /* Log unknown commands */ | |
961 | } | |
962 | rb_dlinkDelete(ptr, &ctl->readq); | |
963 | rb_free(ctl_buf->buf); | |
964 | rb_free(ctl_buf); | |
965 | } | |
966 | ||
967 | } | |
968 | ||
969 | ||
970 | ||
971 | static void | |
972 | mod_read_ctl(rb_fde_t * F, void *data) | |
973 | { | |
974 | mod_ctl_buf_t *ctl_buf; | |
975 | mod_ctl_t *ctl = data; | |
976 | int retlen; | |
977 | ||
978 | do | |
979 | { | |
980 | ctl_buf = rb_malloc(sizeof(mod_ctl_buf_t)); | |
981 | ctl_buf->buf = rb_malloc(READBUF_SIZE); | |
982 | ctl_buf->buflen = READBUF_SIZE; | |
983 | retlen = rb_recv_fd_buf(ctl->F, ctl_buf->buf, ctl_buf->buflen, ctl_buf->F, | |
984 | MAXPASSFD); | |
985 | if(retlen <= 0) | |
986 | { | |
987 | rb_free(ctl_buf->buf); | |
988 | rb_free(ctl_buf); | |
989 | } | |
990 | else | |
991 | { | |
992 | ctl_buf->buflen = retlen; | |
993 | rb_dlinkAddTail(ctl_buf, &ctl_buf->node, &ctl->readq); | |
994 | } | |
995 | } | |
996 | while (retlen > 0); | |
997 | ||
998 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
999 | exit(0); | |
1000 | ||
1001 | mod_process_cmd_recv(ctl); | |
1002 | rb_setselect(ctl->F, RB_SELECT_READ, mod_read_ctl, ctl); | |
1003 | } | |
1004 | ||
1005 | static void | |
1006 | mod_write_ctl(rb_fde_t * F, void *data) | |
1007 | { | |
1008 | mod_ctl_t *ctl = data; | |
1009 | mod_ctl_buf_t *ctl_buf; | |
1010 | rb_dlink_node *ptr, *next; | |
1011 | int retlen, x; | |
1012 | ||
1013 | RB_DLINK_FOREACH_SAFE(ptr, next, ctl->writeq.head) | |
1014 | { | |
1015 | ctl_buf = ptr->data; | |
1016 | retlen = rb_send_fd_buf(ctl->F, ctl_buf->F, ctl_buf->nfds, ctl_buf->buf, | |
1017 | ctl_buf->buflen); | |
1018 | if(retlen > 0) | |
1019 | { | |
1020 | rb_dlinkDelete(ptr, &ctl->writeq); | |
1021 | for (x = 0; x < ctl_buf->nfds; x++) | |
1022 | rb_close(ctl_buf->F[x]); | |
1023 | rb_free(ctl_buf->buf); | |
1024 | rb_free(ctl_buf); | |
1025 | ||
1026 | } | |
1027 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
1028 | exit(0); | |
1029 | ||
1030 | rb_setselect(ctl->F, RB_SELECT_WRITE, mod_write_ctl, ctl); | |
1031 | } | |
1032 | } | |
1033 | ||
1034 | ||
1035 | static void | |
1036 | read_pipe_ctl(rb_fde_t * F, void *data) | |
1037 | { | |
1038 | int retlen; | |
1039 | while ((retlen = rb_read(F, inbuf, sizeof(inbuf))) > 0) | |
1040 | { | |
1041 | ;; /* we don't do anything with the pipe really, just care if the other process dies.. */ | |
1042 | } | |
1043 | if(retlen == 0 || (retlen < 0 && !rb_ignore_errno(errno))) | |
1044 | exit(0); | |
1045 | rb_setselect(F, RB_SELECT_READ, read_pipe_ctl, NULL); | |
1046 | ||
1047 | } | |
1048 | ||
1049 | int | |
1050 | main(int argc, char **argv) | |
1051 | { | |
1052 | const char *s_ctlfd, *s_pipe; | |
1053 | int ctlfd, pipefd, x, maxfd; | |
1054 | maxfd = maxconn(); | |
1055 | s_ctlfd = getenv("CTL_FD"); | |
1056 | s_pipe = getenv("CTL_PIPE"); | |
1057 | ||
1058 | if(s_ctlfd == NULL || s_pipe == NULL) | |
1059 | { | |
1060 | fprintf(stderr, "This is ircd-ratbox ssld. You know you aren't supposed to run me directly?\n"); | |
1061 | fprintf(stderr, "You get an Id tag for this: $Id: ssld.c 25594 2008-06-25 14:58:47Z androsyn $\n"); | |
1062 | fprintf(stderr, "Have a nice life\n"); | |
1063 | exit(1); | |
1064 | } | |
1065 | ||
1066 | ctlfd = atoi(s_ctlfd); | |
1067 | pipefd = atoi(s_pipe); | |
1068 | ||
1069 | for (x = 0; x < maxfd; x++) | |
1070 | { | |
1071 | if(x != ctlfd && x != pipefd && x > 2) | |
1072 | close(x); | |
1073 | } | |
1074 | ||
1075 | #if 0 | |
1076 | x = open("/dev/null", O_RDWR); | |
1077 | if(x >= 0) | |
1078 | { | |
1079 | if(ctlfd != 0 && pipefd != 0) | |
1080 | dup2(x, 0); | |
1081 | if(ctlfd != 1 && pipefd != 1) | |
1082 | dup2(x, 1); | |
1083 | if(ctlfd != 2 && pipefd != 2) | |
1084 | dup2(x, 2); | |
1085 | if(x > 2) | |
1086 | close(x); | |
1087 | } | |
1088 | #endif | |
1089 | setup_signals(); | |
1090 | rb_lib_init(NULL, NULL, NULL, 0, maxfd, 1024, 4096); | |
1091 | rb_init_rawbuffers(1024); | |
1092 | ssl_ok = rb_supports_ssl(); | |
1093 | ||
1094 | mod_ctl = rb_malloc(sizeof(mod_ctl_t)); | |
1095 | mod_ctl->F = rb_open(ctlfd, RB_FD_SOCKET, "ircd control socket"); | |
1096 | mod_ctl->F_pipe = rb_open(pipefd, RB_FD_PIPE, "ircd pipe"); | |
1097 | rb_set_nb(mod_ctl->F); | |
1098 | rb_set_nb(mod_ctl->F_pipe); | |
1099 | rb_event_addish("clean_dead_conns", clean_dead_conns, NULL, 10); | |
1100 | rb_event_add("check_handshake_flood", check_handshake_flood, NULL, 10); | |
1101 | read_pipe_ctl(mod_ctl->F_pipe, NULL); | |
1102 | mod_read_ctl(mod_ctl->F, mod_ctl); | |
1103 | if(!zlib_ok && !ssl_ok) | |
1104 | { | |
1105 | /* this is really useless... */ | |
1106 | send_i_am_useless(mod_ctl); | |
1107 | /* sleep until the ircd kills us */ | |
1108 | rb_sleep(2<<30, 0); | |
1109 | exit(1); | |
1110 | } | |
1111 | ||
1112 | if(!zlib_ok) | |
1113 | send_nozlib_support(mod_ctl, NULL); | |
1114 | if(!ssl_ok) | |
1115 | send_nossl_support(mod_ctl, NULL); | |
1116 | rb_lib_loop(0); | |
1117 | return 0; | |
1118 | } | |
1119 | ||
1120 | ||
1121 | ||
1122 | static void | |
1123 | dummy_handler(int sig) | |
1124 | { | |
1125 | return; | |
1126 | } | |
1127 | ||
1128 | static void | |
1129 | setup_signals() | |
1130 | { | |
1131 | struct sigaction act; | |
1132 | ||
1133 | act.sa_flags = 0; | |
1134 | act.sa_handler = SIG_IGN; | |
1135 | sigemptyset(&act.sa_mask); | |
1136 | sigaddset(&act.sa_mask, SIGPIPE); | |
1137 | sigaddset(&act.sa_mask, SIGALRM); | |
1138 | #ifdef SIGTRAP | |
1139 | sigaddset(&act.sa_mask, SIGTRAP); | |
1140 | #endif | |
1141 | ||
1142 | #ifdef SIGWINCH | |
1143 | sigaddset(&act.sa_mask, SIGWINCH); | |
1144 | sigaction(SIGWINCH, &act, 0); | |
1145 | #endif | |
1146 | sigaction(SIGPIPE, &act, 0); | |
1147 | #ifdef SIGTRAP | |
1148 | sigaction(SIGTRAP, &act, 0); | |
1149 | #endif | |
1150 | ||
1151 | act.sa_handler = dummy_handler; | |
1152 | sigaction(SIGALRM, &act, 0); | |
1153 | } | |
1154 |