1 /*
2 * Stream filters related variables and functions.
3 *
4 * Copyright (C) 2015 Qualys Inc., Christopher Faulet <cfaulet@qualys.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13 #include <ctype.h>
14
15 #include <common/hathreads.h>
16 #include <common/htx.h>
17 #include <common/initcall.h>
18 #include <common/standard.h>
19 #include <common/time.h>
20 #include <common/tools.h>
21
22 #include <types/channel.h>
23 #include <types/filters.h>
24 #include <types/global.h>
25 #include <types/proxy.h>
26 #include <types/stream.h>
27
28 #include <proto/filters.h>
29 #include <proto/http_htx.h>
30 #include <proto/log.h>
31 #include <proto/http_ana.h>
32 #include <proto/stream.h>
33
34 const char *trace_flt_id = "trace filter";
35
36 struct flt_ops trace_ops;
37
38 struct trace_config {
39 struct proxy *proxy;
40 char *name;
41 int rand_parsing;
42 int rand_forwarding;
43 int hexdump;
44 };
45
46 #define FLT_TRACE(conf, fmt, ...) \
47 fprintf(stderr, "%d.%06d [%-20s] " fmt "\n", \
48 (int)now.tv_sec, (int)now.tv_usec, (conf)->name, \
49 ##__VA_ARGS__)
50
51 #define FLT_STRM_TRACE(conf, strm, fmt, ...) \
52 fprintf(stderr, "%d.%06d [%-20s] [strm %p(%x) 0x%08x 0x%08x] " fmt "\n", \
53 (int)now.tv_sec, (int)now.tv_usec, (conf)->name, \
54 strm, (strm ? ((struct stream *)strm)->uniq_id : ~0U), \
55 (strm ? strm->req.analysers : 0), (strm ? strm->res.analysers : 0), \
56 ##__VA_ARGS__)
57
58
59 static const char *
channel_label(const struct channel * chn)60 channel_label(const struct channel *chn)
61 {
62 return (chn->flags & CF_ISRESP) ? "RESPONSE" : "REQUEST";
63 }
64
65 static const char *
proxy_mode(const struct stream * s)66 proxy_mode(const struct stream *s)
67 {
68 struct proxy *px = (s->flags & SF_BE_ASSIGNED ? s->be : strm_fe(s));
69
70 return ((px->mode == PR_MODE_HTTP) ? "HTTP" : "TCP");
71 }
72
73 static const char *
stream_pos(const struct stream * s)74 stream_pos(const struct stream *s)
75 {
76 return (s->flags & SF_BE_ASSIGNED) ? "backend" : "frontend";
77 }
78
79 static const char *
filter_type(const struct filter * f)80 filter_type(const struct filter *f)
81 {
82 return (f->flags & FLT_FL_IS_BACKEND_FILTER) ? "backend" : "frontend";
83 }
84
85 static void
trace_hexdump(struct ist ist)86 trace_hexdump(struct ist ist)
87 {
88 int i, j, padding;
89
90 padding = ((ist.len % 16) ? (16 - ist.len % 16) : 0);
91 for (i = 0; i < ist.len + padding; i++) {
92 if (!(i % 16))
93 fprintf(stderr, "\t0x%06x: ", i);
94 else if (!(i % 8))
95 fprintf(stderr, " ");
96
97 if (i < ist.len)
98 fprintf(stderr, "%02x ", (unsigned char)*(ist.ptr+i));
99 else
100 fprintf(stderr, " ");
101
102 /* print ASCII dump */
103 if (i % 16 == 15) {
104 fprintf(stderr, " |");
105 for(j = i - 15; j <= i && j < ist.len; j++)
106 fprintf(stderr, "%c", (isprint(*(ist.ptr+j)) ? *(ist.ptr+j) : '.'));
107 fprintf(stderr, "|\n");
108 }
109 }
110 }
111
112 static void
trace_raw_hexdump(struct buffer * buf,unsigned int offset,unsigned int len)113 trace_raw_hexdump(struct buffer *buf, unsigned int offset, unsigned int len)
114 {
115 unsigned char p[len];
116 int block1, block2;
117
118 block1 = len;
119 if (block1 > b_contig_data(buf, offset))
120 block1 = b_contig_data(buf, offset);
121 block2 = len - block1;
122
123 memcpy(p, b_peek(buf, offset), block1);
124 memcpy(p+block1, b_orig(buf), block2);
125 trace_hexdump(ist2(p, len));
126 }
127
128 static void
trace_htx_hexdump(struct htx * htx,unsigned int offset,unsigned int len)129 trace_htx_hexdump(struct htx *htx, unsigned int offset, unsigned int len)
130 {
131 struct htx_blk *blk;
132
133 for (blk = htx_get_first_blk(htx); blk && len; blk = htx_get_next_blk(htx, blk)) {
134 enum htx_blk_type type = htx_get_blk_type(blk);
135 uint32_t sz = htx_get_blksz(blk);
136 struct ist v;
137
138 if (offset >= sz) {
139 offset -= sz;
140 continue;
141 }
142
143 v = htx_get_blk_value(htx, blk);
144 v.ptr += offset;
145 v.len -= offset;
146 offset = 0;
147
148 if (v.len > len)
149 v.len = len;
150 len -= v.len;
151 if (type == HTX_BLK_DATA)
152 trace_hexdump(v);
153 }
154 }
155
156 static unsigned int
trace_get_htx_datalen(struct htx * htx,unsigned int offset,unsigned int len)157 trace_get_htx_datalen(struct htx *htx, unsigned int offset, unsigned int len)
158 {
159 struct htx_blk *blk;
160 uint32_t sz, data = 0;
161
162 for (blk = htx_get_first_blk(htx); blk; blk = htx_get_next_blk(htx, blk)) {
163 if (htx_get_blk_type(blk) != HTX_BLK_DATA)
164 break;
165
166 sz = htx_get_blksz(blk);
167 if (offset >= sz) {
168 offset -= sz;
169 continue;
170 }
171 data += sz - offset;
172 offset = 0;
173 if (data > len) {
174 data = len;
175 break;
176 }
177 }
178 return data;
179 }
180
181 /***************************************************************************
182 * Hooks that manage the filter lifecycle (init/check/deinit)
183 **************************************************************************/
184 /* Initialize the filter. Returns -1 on error, else 0. */
185 static int
trace_init(struct proxy * px,struct flt_conf * fconf)186 trace_init(struct proxy *px, struct flt_conf *fconf)
187 {
188 struct trace_config *conf = fconf->conf;
189
190 if (conf->name)
191 memprintf(&conf->name, "%s/%s", conf->name, px->id);
192 else
193 memprintf(&conf->name, "TRACE/%s", px->id);
194
195 fconf->flags |= FLT_CFG_FL_HTX;
196 fconf->conf = conf;
197
198 FLT_TRACE(conf, "filter initialized [read random=%s - fwd random=%s - hexdump=%s]",
199 (conf->rand_parsing ? "true" : "false"),
200 (conf->rand_forwarding ? "true" : "false"),
201 (conf->hexdump ? "true" : "false"));
202 return 0;
203 }
204
205 /* Free ressources allocated by the trace filter. */
206 static void
trace_deinit(struct proxy * px,struct flt_conf * fconf)207 trace_deinit(struct proxy *px, struct flt_conf *fconf)
208 {
209 struct trace_config *conf = fconf->conf;
210
211 if (conf) {
212 FLT_TRACE(conf, "filter deinitialized");
213 free(conf->name);
214 free(conf);
215 }
216 fconf->conf = NULL;
217 }
218
219 /* Check configuration of a trace filter for a specified proxy.
220 * Return 1 on error, else 0. */
221 static int
trace_check(struct proxy * px,struct flt_conf * fconf)222 trace_check(struct proxy *px, struct flt_conf *fconf)
223 {
224 return 0;
225 }
226
227 /* Initialize the filter for each thread. Return -1 on error, else 0. */
228 static int
trace_init_per_thread(struct proxy * px,struct flt_conf * fconf)229 trace_init_per_thread(struct proxy *px, struct flt_conf *fconf)
230 {
231 struct trace_config *conf = fconf->conf;
232
233 FLT_TRACE(conf, "filter initialized for thread tid %u", tid);
234 return 0;
235 }
236
237 /* Free ressources allocate by the trace filter for each thread. */
238 static void
trace_deinit_per_thread(struct proxy * px,struct flt_conf * fconf)239 trace_deinit_per_thread(struct proxy *px, struct flt_conf *fconf)
240 {
241 struct trace_config *conf = fconf->conf;
242
243 if (conf)
244 FLT_TRACE(conf, "filter deinitialized for thread tid %u", tid);
245 }
246
247 /**************************************************************************
248 * Hooks to handle start/stop of streams
249 *************************************************************************/
250 /* Called when a filter instance is created and attach to a stream */
251 static int
trace_attach(struct stream * s,struct filter * filter)252 trace_attach(struct stream *s, struct filter *filter)
253 {
254 struct trace_config *conf = FLT_CONF(filter);
255
256 FLT_STRM_TRACE(conf, s, "%-25s: filter-type=%s",
257 __FUNCTION__, filter_type(filter));
258
259 return 1;
260 }
261
262 /* Called when a filter instance is detach from a stream, just before its
263 * destruction */
264 static void
trace_detach(struct stream * s,struct filter * filter)265 trace_detach(struct stream *s, struct filter *filter)
266 {
267 struct trace_config *conf = FLT_CONF(filter);
268
269 FLT_STRM_TRACE(conf, s, "%-25s: filter-type=%s",
270 __FUNCTION__, filter_type(filter));
271 }
272
273 /* Called when a stream is created */
274 static int
trace_stream_start(struct stream * s,struct filter * filter)275 trace_stream_start(struct stream *s, struct filter *filter)
276 {
277 struct trace_config *conf = FLT_CONF(filter);
278
279 FLT_STRM_TRACE(conf, s, "%-25s",
280 __FUNCTION__);
281 return 0;
282 }
283
284
285 /* Called when a backend is set for a stream */
286 static int
trace_stream_set_backend(struct stream * s,struct filter * filter,struct proxy * be)287 trace_stream_set_backend(struct stream *s, struct filter *filter,
288 struct proxy *be)
289 {
290 struct trace_config *conf = FLT_CONF(filter);
291
292 FLT_STRM_TRACE(conf, s, "%-25s: backend=%s",
293 __FUNCTION__, be->id);
294 return 0;
295 }
296
297 /* Called when a stream is destroyed */
298 static void
trace_stream_stop(struct stream * s,struct filter * filter)299 trace_stream_stop(struct stream *s, struct filter *filter)
300 {
301 struct trace_config *conf = FLT_CONF(filter);
302
303 FLT_STRM_TRACE(conf, s, "%-25s",
304 __FUNCTION__);
305 }
306
307 /* Called when the stream is woken up because of an expired timer */
308 static void
trace_check_timeouts(struct stream * s,struct filter * filter)309 trace_check_timeouts(struct stream *s, struct filter *filter)
310 {
311 struct trace_config *conf = FLT_CONF(filter);
312
313 FLT_STRM_TRACE(conf, s, "%-25s",
314 __FUNCTION__);
315 }
316
317 /**************************************************************************
318 * Hooks to handle channels activity
319 *************************************************************************/
320 /* Called when analyze starts for a given channel */
321 static int
trace_chn_start_analyze(struct stream * s,struct filter * filter,struct channel * chn)322 trace_chn_start_analyze(struct stream *s, struct filter *filter,
323 struct channel *chn)
324 {
325 struct trace_config *conf = FLT_CONF(filter);
326
327 FLT_STRM_TRACE(conf, s, "%-25s: channel=%-10s - mode=%-5s (%s)",
328 __FUNCTION__,
329 channel_label(chn), proxy_mode(s), stream_pos(s));
330 filter->pre_analyzers |= (AN_REQ_ALL | AN_RES_ALL);
331 filter->post_analyzers |= (AN_REQ_ALL | AN_RES_ALL);
332 register_data_filter(s, chn, filter);
333 return 1;
334 }
335
336 /* Called before a processing happens on a given channel */
337 static int
trace_chn_analyze(struct stream * s,struct filter * filter,struct channel * chn,unsigned an_bit)338 trace_chn_analyze(struct stream *s, struct filter *filter,
339 struct channel *chn, unsigned an_bit)
340 {
341 struct trace_config *conf = FLT_CONF(filter);
342 char *ana;
343
344 switch (an_bit) {
345 case AN_REQ_INSPECT_FE:
346 ana = "AN_REQ_INSPECT_FE";
347 break;
348 case AN_REQ_WAIT_HTTP:
349 ana = "AN_REQ_WAIT_HTTP";
350 break;
351 case AN_REQ_HTTP_BODY:
352 ana = "AN_REQ_HTTP_BODY";
353 break;
354 case AN_REQ_HTTP_PROCESS_FE:
355 ana = "AN_REQ_HTTP_PROCESS_FE";
356 break;
357 case AN_REQ_SWITCHING_RULES:
358 ana = "AN_REQ_SWITCHING_RULES";
359 break;
360 case AN_REQ_INSPECT_BE:
361 ana = "AN_REQ_INSPECT_BE";
362 break;
363 case AN_REQ_HTTP_PROCESS_BE:
364 ana = "AN_REQ_HTTP_PROCESS_BE";
365 break;
366 case AN_REQ_SRV_RULES:
367 ana = "AN_REQ_SRV_RULES";
368 break;
369 case AN_REQ_HTTP_INNER:
370 ana = "AN_REQ_HTTP_INNER";
371 break;
372 case AN_REQ_HTTP_TARPIT:
373 ana = "AN_REQ_HTTP_TARPIT";
374 break;
375 case AN_REQ_STICKING_RULES:
376 ana = "AN_REQ_STICKING_RULES";
377 break;
378 case AN_REQ_PRST_RDP_COOKIE:
379 ana = "AN_REQ_PRST_RDP_COOKIE";
380 break;
381 case AN_REQ_HTTP_XFER_BODY:
382 ana = "AN_REQ_HTTP_XFER_BODY";
383 break;
384 case AN_RES_INSPECT:
385 ana = "AN_RES_INSPECT";
386 break;
387 case AN_RES_WAIT_HTTP:
388 ana = "AN_RES_WAIT_HTTP";
389 break;
390 case AN_RES_HTTP_PROCESS_FE: // AN_RES_HTTP_PROCESS_BE
391 ana = "AN_RES_HTTP_PROCESS_FE/BE";
392 break;
393 case AN_RES_STORE_RULES:
394 ana = "AN_RES_STORE_RULES";
395 break;
396 case AN_RES_HTTP_XFER_BODY:
397 ana = "AN_RES_HTTP_XFER_BODY";
398 break;
399 default:
400 ana = "unknown";
401 }
402
403 FLT_STRM_TRACE(conf, s, "%-25s: channel=%-10s - mode=%-5s (%s) - "
404 "analyzer=%s - step=%s",
405 __FUNCTION__,
406 channel_label(chn), proxy_mode(s), stream_pos(s),
407 ana, ((chn->analysers & an_bit) ? "PRE" : "POST"));
408 return 1;
409 }
410
411 /* Called when analyze ends for a given channel */
412 static int
trace_chn_end_analyze(struct stream * s,struct filter * filter,struct channel * chn)413 trace_chn_end_analyze(struct stream *s, struct filter *filter,
414 struct channel *chn)
415 {
416 struct trace_config *conf = FLT_CONF(filter);
417
418 FLT_STRM_TRACE(conf, s, "%-25s: channel=%-10s - mode=%-5s (%s)",
419 __FUNCTION__,
420 channel_label(chn), proxy_mode(s), stream_pos(s));
421 return 1;
422 }
423
424 /**************************************************************************
425 * Hooks to filter HTTP messages
426 *************************************************************************/
427 static int
trace_http_headers(struct stream * s,struct filter * filter,struct http_msg * msg)428 trace_http_headers(struct stream *s, struct filter *filter,
429 struct http_msg *msg)
430 {
431 struct trace_config *conf = FLT_CONF(filter);
432 struct htx *htx = htxbuf(&msg->chn->buf);
433 struct htx_sl *sl = http_get_stline(htx);
434 int32_t pos;
435
436 FLT_STRM_TRACE(conf, s, "%-25s: channel=%-10s - mode=%-5s (%s)\t%.*s %.*s %.*s",
437 __FUNCTION__,
438 channel_label(msg->chn), proxy_mode(s), stream_pos(s),
439 HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl),
440 HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl),
441 HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl));
442
443 for (pos = htx_get_first(htx); pos != -1; pos = htx_get_next(htx, pos)) {
444 struct htx_blk *blk = htx_get_blk(htx, pos);
445 enum htx_blk_type type = htx_get_blk_type(blk);
446 struct ist n, v;
447
448 if (type == HTX_BLK_EOH)
449 break;
450 if (type != HTX_BLK_HDR)
451 continue;
452
453 n = htx_get_blk_name(htx, blk);
454 v = htx_get_blk_value(htx, blk);
455 FLT_STRM_TRACE(conf, s, "\t%.*s: %.*s",
456 (int)n.len, n.ptr, (int)v.len, v.ptr);
457 }
458 return 1;
459 }
460
461 static int
trace_http_payload(struct stream * s,struct filter * filter,struct http_msg * msg,unsigned int offset,unsigned int len)462 trace_http_payload(struct stream *s, struct filter *filter, struct http_msg *msg,
463 unsigned int offset, unsigned int len)
464 {
465 struct trace_config *conf = FLT_CONF(filter);
466 int ret = len;
467
468 if (ret && conf->rand_forwarding) {
469 unsigned int data = trace_get_htx_datalen(htxbuf(&msg->chn->buf), offset, len);
470
471 if (data) {
472 ret = ha_random() % (ret+1);
473 if (!ret || ret >= data)
474 ret = len;
475 }
476 }
477
478 FLT_STRM_TRACE(conf, s, "%-25s: channel=%-10s - mode=%-5s (%s) - "
479 "offset=%u - len=%u - forward=%d",
480 __FUNCTION__,
481 channel_label(msg->chn), proxy_mode(s), stream_pos(s),
482 offset, len, ret);
483
484 if (conf->hexdump)
485 trace_htx_hexdump(htxbuf(&msg->chn->buf), offset, ret);
486
487 if (ret != len)
488 task_wakeup(s->task, TASK_WOKEN_MSG);
489 return ret;
490 }
491
492 static int
trace_http_end(struct stream * s,struct filter * filter,struct http_msg * msg)493 trace_http_end(struct stream *s, struct filter *filter,
494 struct http_msg *msg)
495 {
496 struct trace_config *conf = FLT_CONF(filter);
497
498 FLT_STRM_TRACE(conf, s, "%-25s: channel=%-10s - mode=%-5s (%s)",
499 __FUNCTION__,
500 channel_label(msg->chn), proxy_mode(s), stream_pos(s));
501 return 1;
502 }
503
504 static void
trace_http_reset(struct stream * s,struct filter * filter,struct http_msg * msg)505 trace_http_reset(struct stream *s, struct filter *filter,
506 struct http_msg *msg)
507 {
508 struct trace_config *conf = FLT_CONF(filter);
509
510 FLT_STRM_TRACE(conf, s, "%-25s: channel=%-10s - mode=%-5s (%s)",
511 __FUNCTION__,
512 channel_label(msg->chn), proxy_mode(s), stream_pos(s));
513 }
514
515 static void
trace_http_reply(struct stream * s,struct filter * filter,short status,const struct buffer * msg)516 trace_http_reply(struct stream *s, struct filter *filter, short status,
517 const struct buffer *msg)
518 {
519 struct trace_config *conf = FLT_CONF(filter);
520
521 FLT_STRM_TRACE(conf, s, "%-25s: channel=%-10s - mode=%-5s (%s)",
522 __FUNCTION__, "-", proxy_mode(s), stream_pos(s));
523 }
524
525 /**************************************************************************
526 * Hooks to filter TCP data
527 *************************************************************************/
528 static int
trace_tcp_payload(struct stream * s,struct filter * filter,struct channel * chn,unsigned int offset,unsigned int len)529 trace_tcp_payload(struct stream *s, struct filter *filter, struct channel *chn,
530 unsigned int offset, unsigned int len)
531 {
532 struct trace_config *conf = FLT_CONF(filter);
533 int ret = len;
534
535 if (s->flags & SF_HTX) {
536 if (ret && conf->rand_forwarding) {
537 unsigned int data = trace_get_htx_datalen(htxbuf(&chn->buf), offset, len);
538
539 if (data) {
540 ret = ha_random() % (ret+1);
541 if (!ret || ret >= data)
542 ret = len;
543 }
544 }
545
546 FLT_STRM_TRACE(conf, s, "%-25s: channel=%-10s - mode=%-5s (%s) - "
547 "offset=%u - len=%u - forward=%d",
548 __FUNCTION__,
549 channel_label(chn), proxy_mode(s), stream_pos(s),
550 offset, len, ret);
551
552 if (conf->hexdump)
553 trace_htx_hexdump(htxbuf(&chn->buf), offset, ret);
554 }
555 else {
556
557 if (ret && conf->rand_forwarding)
558 ret = ha_random() % (ret+1);
559
560 FLT_STRM_TRACE(conf, s, "%-25s: channel=%-10s - mode=%-5s (%s) - "
561 "offset=%u - len=%u - forward=%d",
562 __FUNCTION__,
563 channel_label(chn), proxy_mode(s), stream_pos(s),
564 offset, len, ret);
565
566 if (conf->hexdump)
567 trace_raw_hexdump(&chn->buf, offset, ret);
568 }
569
570 if (ret != len)
571 task_wakeup(s->task, TASK_WOKEN_MSG);
572 return ret;
573 }
574 /********************************************************************
575 * Functions that manage the filter initialization
576 ********************************************************************/
577 struct flt_ops trace_ops = {
578 /* Manage trace filter, called for each filter declaration */
579 .init = trace_init,
580 .deinit = trace_deinit,
581 .check = trace_check,
582 .init_per_thread = trace_init_per_thread,
583 .deinit_per_thread = trace_deinit_per_thread,
584
585 /* Handle start/stop of streams */
586 .attach = trace_attach,
587 .detach = trace_detach,
588 .stream_start = trace_stream_start,
589 .stream_set_backend = trace_stream_set_backend,
590 .stream_stop = trace_stream_stop,
591 .check_timeouts = trace_check_timeouts,
592
593 /* Handle channels activity */
594 .channel_start_analyze = trace_chn_start_analyze,
595 .channel_pre_analyze = trace_chn_analyze,
596 .channel_post_analyze = trace_chn_analyze,
597 .channel_end_analyze = trace_chn_end_analyze,
598
599 /* Filter HTTP requests and responses */
600 .http_headers = trace_http_headers,
601 .http_payload = trace_http_payload,
602 .http_end = trace_http_end,
603 .http_reset = trace_http_reset,
604 .http_reply = trace_http_reply,
605
606 /* Filter TCP data */
607 .tcp_payload = trace_tcp_payload,
608 };
609
610 /* Return -1 on error, else 0 */
611 static int
parse_trace_flt(char ** args,int * cur_arg,struct proxy * px,struct flt_conf * fconf,char ** err,void * private)612 parse_trace_flt(char **args, int *cur_arg, struct proxy *px,
613 struct flt_conf *fconf, char **err, void *private)
614 {
615 struct trace_config *conf;
616 int pos = *cur_arg;
617
618 conf = calloc(1, sizeof(*conf));
619 if (!conf) {
620 memprintf(err, "%s: out of memory", args[*cur_arg]);
621 return -1;
622 }
623 conf->proxy = px;
624
625 if (!strcmp(args[pos], "trace")) {
626 pos++;
627
628 while (*args[pos]) {
629 if (!strcmp(args[pos], "name")) {
630 if (!*args[pos + 1]) {
631 memprintf(err, "'%s' : '%s' option without value",
632 args[*cur_arg], args[pos]);
633 goto error;
634 }
635 conf->name = strdup(args[pos + 1]);
636 if (!conf->name) {
637 memprintf(err, "%s: out of memory", args[*cur_arg]);
638 goto error;
639 }
640 pos++;
641 }
642 else if (!strcmp(args[pos], "random-parsing"))
643 conf->rand_parsing = 1;
644 else if (!strcmp(args[pos], "random-forwarding"))
645 conf->rand_forwarding = 1;
646 else if (!strcmp(args[pos], "hexdump"))
647 conf->hexdump = 1;
648 else
649 break;
650 pos++;
651 }
652 *cur_arg = pos;
653 fconf->id = trace_flt_id;
654 fconf->ops = &trace_ops;
655 }
656
657 fconf->conf = conf;
658 return 0;
659
660 error:
661 if (conf->name)
662 free(conf->name);
663 free(conf);
664 return -1;
665 }
666
667 /* Declare the filter parser for "trace" keyword */
668 static struct flt_kw_list flt_kws = { "TRACE", { }, {
669 { "trace", parse_trace_flt, NULL },
670 { NULL, NULL, NULL },
671 }
672 };
673
674 INITCALL1(STG_REGISTER, flt_register_keywords, &flt_kws);
675