-
Notifications
You must be signed in to change notification settings - Fork 8
/
ctrl_iface.c
604 lines (521 loc) · 14.2 KB
/
ctrl_iface.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
/*******************************************************************************
LLDP Agent Daemon (LLDPAD) Software
Copyright(c) 2007-2010 Intel Corporation.
Substantially modified from:
hostapd-0.5.7
Copyright (c) 2002-2007, Jouni Malinen <[email protected]> and
contributors
This program is free software; you can redistribute it and/or modify it
under the terms and conditions of the GNU General Public License,
version 2, as published by the Free Software Foundation.
This program is distributed in the hope it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
The full GNU General Public License is included in this distribution in
the file called "COPYING".
Contact Information:
open-lldp Mailing List <[email protected]>
*******************************************************************************/
#define _GNU_SOURCE
#include <stdlib.h>
#include <string.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include "lldpad.h"
#include "eloop.h"
#include "ctrl_iface.h"
#include "dcb_protocol.h"
#include "list.h"
#include "lldp_mod.h"
#include "clif_msgs.h"
#include "lldpad_status.h"
#include "lldp/ports.h"
#include "lldp_dcbx.h"
#include "lldp_util.h"
#include "messages.h"
extern struct lldp_head lldp_head;
struct ctrl_dst {
struct ctrl_dst *next;
struct sockaddr_un addr;
socklen_t addrlen;
int debug_level;
int errors;
u32 *tlv_types; /*tlv event types to recv */
};
static char *hexlist = "0123456789abcdef";
struct clif_cmds {
int cmd;
int (*cmd_handler)(struct clif_data *cd,
struct sockaddr_un *from,
socklen_t fromlen,
char *ibuf, int ilen,
char *rbuf, int rlen);
};
static const struct clif_cmds cmd_tbl[] = {
{ DCB_CMD, clif_iface_module },
{ MOD_CMD, clif_iface_module },
{ ATTACH_CMD, clif_iface_attach },
{ DETACH_CMD, clif_iface_detach },
{ LEVEL_CMD, clif_iface_level },
{ PING_CMD, clif_iface_ping },
{ UNKNOWN_CMD, clif_iface_cmd_unknown }
};
int clif_iface_module(struct clif_data *clifd,
struct sockaddr_un *from,
socklen_t fromlen,
char *ibuf, int ilen,
char *rbuf, int rlen)
{
u32 module_id;
char *cmd_start;
int cmd_len;
struct lldp_module *mod = NULL;
/* identify the module and start of command */
switch (*ibuf) {
case DCB_CMD:
/* Message does not contain a module id, therefore this
* message is a DCBX message. Set module_id to correct value.
*/
module_id = 0x001b2101;
cmd_start = ibuf;
cmd_len = ilen;
break;
case MOD_CMD:
hexstr2bin(ibuf+MOD_ID, (u8 *)&module_id, sizeof(module_id));
module_id = ntohl(module_id);
cmd_start = ibuf + MOD_ID + 2*sizeof(module_id);
cmd_len = ilen - MOD_ID - 2*sizeof(module_id);
break;
default:
return cmd_invalid;
}
mod = find_module_by_id(&lldp_head, module_id);
if (mod && mod->ops && mod->ops->client_cmd)
return (mod->ops->client_cmd)(clifd, from, fromlen,
cmd_start, cmd_len, rbuf+strlen(rbuf), rlen);
else
return cmd_device_not_found;
}
int clif_iface_cmd_unknown(UNUSED struct clif_data *clifd,
UNUSED struct sockaddr_un *from,
UNUSED socklen_t fromlen,
UNUSED char *ibuf, UNUSED int ilen,
UNUSED char *rbuf, UNUSED int rlen)
{
return cmd_invalid;
}
int clif_iface_ping(UNUSED struct clif_data *clifd,
UNUSED struct sockaddr_un *from,
UNUSED socklen_t fromlen,
UNUSED char *ibuf, UNUSED int ilen,
char *rbuf, int rlen)
{
snprintf(rbuf, rlen, "%cPONG%d", PING_CMD, getpid());
return 0;
}
int clif_iface_attach(struct clif_data *clifd,
struct sockaddr_un *from,
socklen_t fromlen,
char *ibuf, UNUSED int ilen,
char *rbuf, int rlen)
{
struct ctrl_dst *dst;
char *tlv, *str, *tokenize;
const char *delim = ",";
int i, tlv_count = 0;
dst = malloc(sizeof(*dst));
if (dst == NULL)
return cmd_failed;
memset(dst, 0, sizeof(*dst));
memcpy(&dst->addr, from, sizeof(struct sockaddr_un));
dst->addrlen = fromlen;
dst->debug_level = MSG_INFO;
/*
* There are two cases here one, the user provided
* no string in which case we must send DCBX events
* to be compatible with legacy clients. Two the
* user sent a comma seperated string of tlv module
* ids it expects events from
*/
/* set default string to DCBX Events */
if (ibuf[1] == '\0') {
u32 hex = LLDP_MOD_DCBX;
tlv = malloc(sizeof(char) * (8 + 2));
if (!tlv)
goto err_tlv;
tlv[0] = 'A';
tlv[9] = 0;
bin2hexstr((u8*)&hex, 4, &tlv[1], 8);
} else
tlv = strdup(ibuf);
str = tlv;
str++;
/* Count number of TLV Modules */
tokenize = strtok(str, delim);
tlv_count++;
do {
tokenize = strtok(NULL, delim);
tlv_count++;
} while (tokenize);
dst->tlv_types = malloc(sizeof(u32) * tlv_count);
if (!dst->tlv_types)
goto err_types;
memset(dst->tlv_types, 0, sizeof(u32) * tlv_count);
/* Populate tlv_types from comma separated string */
tokenize = strtok(str, delim);
for (i=0; tokenize; i++) {
char *myend;
dst->tlv_types[i] = strtol(tokenize, &myend, 16);
if (*myend) /* No hexnumber for module id */
goto err_types;
tokenize = strtok(NULL, delim);
}
/* Insert Termination Pattern */
dst->tlv_types[i] = ~0;
free(tlv);
/* Insert new node at beginning */
dst->next = clifd->ctrl_dst;
clifd->ctrl_dst = dst;
LLDPAD_DBG("CTRL_IFACE monitor attached\n");
snprintf(rbuf, rlen, "%c", ATTACH_CMD);
return cmd_success;
err_types:
free(tlv);
err_tlv:
free(dst);
LLDPAD_DBG("CTRL_IFACE monitor attach error\n");
snprintf(rbuf, rlen, "%c", ATTACH_CMD);
return cmd_failed;
}
static int detach_clif_monitor(struct clif_data *clifd,
struct sockaddr_un *from,
socklen_t fromlen)
{
struct ctrl_dst *dst, *prev = NULL;
dst = clifd->ctrl_dst;
while (dst) {
if (fromlen == dst->addrlen &&
memcmp(from->sun_path, dst->addr.sun_path,
fromlen-sizeof(from->sun_family)) == 0) {
if (prev == NULL)
clifd->ctrl_dst = dst->next;
else
prev->next = dst->next;
free(dst->tlv_types);
free(dst);
dst = NULL;
LLDPAD_DBG("CTRL_IFACE monitor detached\n");
return 0;
}
prev = dst;
dst = dst->next;
}
return cmd_failed;
}
int clif_iface_detach(struct clif_data *clifd,
struct sockaddr_un *from,
socklen_t fromlen,
UNUSED char *ibuf, UNUSED int ilen,
char *rbuf, int rlen)
{
snprintf(rbuf, rlen, "%c", DETACH_CMD);
return detach_clif_monitor(clifd, from, fromlen);
}
int clif_iface_level(struct clif_data *clifd,
struct sockaddr_un *from,
socklen_t fromlen,
char *ibuf, UNUSED int ilen,
char *rbuf, int rlen)
{
struct ctrl_dst *dst;
char *level;
level = ibuf+1;
snprintf(rbuf, rlen, "%c", LEVEL_CMD);
LLDPAD_DBG("CTRL_IFACE LEVEL %s\n", level);
dst = clifd->ctrl_dst;
while (dst) {
if (fromlen == dst->addrlen &&
memcmp(from->sun_path, dst->addr.sun_path,
fromlen-sizeof(from->sun_family)) == 0) {
LLDPAD_DBG("CTRL_IFACE changed monitor level\n");
return 0;
}
dst = dst->next;
}
return cmd_failed;
}
static int find_cmd_entry(int cmd)
{
int i;
for (i = 0; cmd_tbl[i].cmd != cmd && cmd_tbl[i].cmd != UNKNOWN_CMD; i++)
;
return (i);
}
/* process_clif_cmd - routine to pass command to correct module routine and
* compute length and status.
*
* Note: ibuf and ilen must be verified by caller.
*/
static void process_clif_cmd( struct clif_data *cd,
struct sockaddr_un *from,
socklen_t fromlen,
char *ibuf, int ilen, char *rbuf, int rsize, int *rlen)
{
int status;
/* setup minimum command response message
* status will be updated at end */
snprintf(rbuf, rsize, "%c%02x", CMD_RESPONSE, cmd_failed);
status = cmd_tbl[find_cmd_entry((int)ibuf[0])].cmd_handler(
cd, from, fromlen, ibuf, ilen,
rbuf + strlen(rbuf),
rsize - strlen(rbuf) - 1);
/* update status and compute final length */
rbuf[CLIF_STAT_OFF] = hexlist[(status & 0xf0) >> 4];
rbuf[CLIF_STAT_OFF+1] = hexlist[status & 0x0f];
*rlen = strlen(rbuf);
}
static void ctrl_iface_receive(int sock, void *eloop_ctx,
UNUSED void *sock_ctx)
{
struct clif_data *clifd = eloop_ctx;
char buf[MAX_CLIF_MSGBUF];
struct msghdr smsg;
struct cmsghdr *cmsg;
struct iovec iov;
struct ucred *cred;
char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
int res;
struct sockaddr_un from;
socklen_t fromlen = sizeof(from);
char *reply;
const int reply_size = MAX_CLIF_MSGBUF;
int reply_len;
memset(&buf, 0x00, sizeof(buf));
iov.iov_base = buf;
iov.iov_len = sizeof(buf) - 1;
memset(&smsg, 0x00, sizeof(struct msghdr));
smsg.msg_name = &from;
smsg.msg_namelen = fromlen;
smsg.msg_iov = &iov;
smsg.msg_iovlen = 1;
smsg.msg_control = cred_msg;
smsg.msg_controllen = sizeof(cred_msg);
res = recvmsg(sock, &smsg, 0);
if (res < 0) {
perror("recvfrom(ctrl_iface)");
return;
}
cmsg = CMSG_FIRSTHDR(&smsg);
fromlen = smsg.msg_namelen;
cred = (struct ucred *)CMSG_DATA(cmsg);
if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
LLDPAD_INFO("%s: No sender credentials, ignoring\n",
__FUNCTION__);
sprintf(buf,"R%02x", cmd_bad_params);
sendto(sock, buf, 3, 0, (struct sockaddr *) &from, fromlen);
return;
}
if (cred->uid != 0) {
LLDPAD_INFO("%s: sender uid=%i, ignoring\n",
__FUNCTION__, cred->uid);
sprintf(buf,"R%02x", cmd_no_access);
sendto(sock, buf, 3, 0, (struct sockaddr *) &from,
fromlen);
return;
}
buf[res] = '\0';
/* wpa_hexdump_ascii(MSG_DEBUG, "RX ctrl_iface", (u8 *) buf, res); */
reply = malloc(reply_size);
if (reply == NULL) {
sendto(sock, "R01", 3, 0, (struct sockaddr *) &from,
fromlen);
return;
}
memset(reply, 0, reply_size);
process_clif_cmd(clifd, &from, fromlen, buf, res,
reply, reply_size, &reply_len);
/* wpa_hexdump_ascii(MSG_DEBUG, "TX ctrl_iface", (u8 *) reply, reply_len); */
sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from, fromlen);
free(reply);
}
int ctrl_iface_register(struct clif_data *clifd)
{
return eloop_register_read_sock(clifd->ctrl_sock, ctrl_iface_receive,
clifd, NULL);
}
int ctrl_iface_systemd_socket()
{
char *env, *ptr;
unsigned int p, l;
env = getenv("LISTEN_PID");
if (!env)
return -1;
p = strtoul(env, &ptr, 10);
if (ptr && ptr == env) {
LLDPAD_DBG("Invalid value '%s' for LISTEN_PID\n", env);
return -1;
}
if ((pid_t)p != getpid()) {
LLDPAD_DBG("Invalid PID '%d' from LISTEN_PID\n", p);
return -1;
}
env = getenv("LISTEN_FDS");
if (!env) {
LLDPAD_DBG("LISTEN_FDS is not set\n");
return -1;
}
l = strtoul(env, &ptr, 10);
if (ptr && ptr == env) {
LLDPAD_INFO("Invalid value '%s' for LISTEN_FDS\n", env);
return -1;
}
if (l != 1) {
LLDPAD_INFO("LISTEN_FDS specified %d fds\n", l);
return -1;
}
/* systemd returns fds with an offset of '3' */
return 3;
}
int ctrl_iface_init(struct clif_data *clifd)
{
struct sockaddr_un addr;
int s = -1;
socklen_t addrlen;
const int feature_on = 1;
clifd->ctrl_sock = -1;
clifd->ctrl_dst = NULL;
s = ctrl_iface_systemd_socket();
if (s != -1) {
LLDPAD_INFO("using fd %d from systemd\n", s);
goto out;
}
s = socket(AF_LOCAL, SOCK_DGRAM, 0);
if (s < 0) {
LLDPAD_WARN("failed to create CLI socket: %m\n");
goto fail;
}
/* enable receiving of the sender credentials */
setsockopt(s, SOL_SOCKET, SO_PASSCRED,
&feature_on, sizeof(feature_on));
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_LOCAL;
snprintf(&addr.sun_path[1], sizeof(addr.sun_path) - 1,
"%s", LLDP_CLIF_SOCK);
addrlen = sizeof(sa_family_t) + strlen(addr.sun_path + 1) + 1;
if (bind(s, (struct sockaddr *) &addr, addrlen) < 0) {
if (errno == EADDRINUSE)
LLDPAD_WARN("another lldpad instance is running\n");
else
LLDPAD_WARN("failed to bind CLI socket address: %m");
goto fail;
}
/* enable receiving of the sender credentials */
setsockopt(s, SOL_SOCKET, SO_PASSCRED,
&feature_on, sizeof(feature_on));
LLDPAD_INFO("bound ctrl iface to %s\n", &addr.sun_path[1]);
out:
clifd->ctrl_sock = s;
return 0;
fail:
if (s >= 0)
close(s);
return -1;
}
void ctrl_iface_deinit(struct clif_data *clifd)
{
struct ctrl_dst *dst, *prev;
if (clifd->ctrl_sock > -1) {
eloop_unregister_read_sock(clifd->ctrl_sock);
close(clifd->ctrl_sock);
clifd->ctrl_sock = -1;
}
dst = clifd->ctrl_dst;
while (dst) {
prev = dst;
dst = dst->next;
free(prev);
}
free(clifd);
}
int is_ctrl_listening(struct ctrl_dst *dst, u32 type)
{
int i;
u32 term = ~0;
u32 all = 0;
u32 dcbx = LLDP_MOD_DCBX;
if (!dst)
return 0;
for (i=0; dst->tlv_types[i] != term; i++) {
if ((!type && dst->tlv_types[i] == dcbx) ||
dst->tlv_types[i] == type || dst->tlv_types[i] == all)
return 1;
}
return 0;
}
void ctrl_iface_send(struct clif_data *clifd, int level, u32 moduleid,
char *buf, size_t len)
{
struct ctrl_dst *dst, *next;
struct msghdr msg;
int idx, send;
struct iovec io[3];
char levelstr[10] = "";
char modulestr[10] = "";
dst = clifd->ctrl_dst;
if (clifd->ctrl_sock < 0 || dst == NULL)
return;
snprintf(levelstr, sizeof(levelstr), "%c%d", EVENT_MSG, level);
if (moduleid) {
snprintf(modulestr, sizeof(modulestr), "M%08x",moduleid);
io[0].iov_base = modulestr;
io[0].iov_len = strlen(modulestr);
} else {
io[0].iov_base = NULL;
io[0].iov_len = 0;
}
io[1].iov_base = levelstr;
io[1].iov_len = strlen(levelstr);
io[2].iov_base = buf;
io[2].iov_len = len;
memset(&msg, 0, sizeof(msg));
msg.msg_iov = io;
msg.msg_iovlen = 3;
idx = 0;
while (dst) {
next = dst->next;
send = 0;
/* Does dst receive these event messages? */
send = is_ctrl_listening(dst, moduleid);
/* Yes */
if (send && level >= dst->debug_level) {
msg.msg_name = &dst->addr;
msg.msg_namelen = dst->addrlen;
if (sendmsg(clifd->ctrl_sock, &msg, 0) < 0) {
fprintf(stderr,
"CTRL_IFACE monitor[%d][%d] %d:%s: ",
idx, clifd->ctrl_sock, dst->addrlen,
dst->addr.sun_path);
perror("sendmsg");
dst->errors++;
if (dst->errors > 10) {
detach_clif_monitor(
clifd, &dst->addr,
dst->addrlen);
}
} else {
dst->errors = 0;
}
}
idx++;
dst = next;
}
}