Send my address if no bind_address on IPCP
[l2tpns.git] / cluster.c
1 // L2TPNS Clustering Stuff
2
3 char const *cvs_id_cluster = "$Id: cluster.c,v 1.9 2004/07/11 07:57:35 bodea Exp $";
4
5 #include <stdio.h>
6 #include <sys/file.h>
7 #include <sys/stat.h>
8 #include <sys/socket.h>
9 #include <netinet/in.h>
10 #include <arpa/inet.h>
11 #include <sys/ioctl.h>
12 #include <net/if.h>
13 #include <string.h>
14 #include <malloc.h>
15 #include <errno.h>
16 #include <stdlib.h>
17 #include <stdarg.h>
18 #include <unistd.h>
19 #include <stdio.h>
20 #include <libcli.h>
21
22 #include "l2tpns.h"
23 #include "cluster.h"
24 #include "util.h"
25 #include "tbf.h"
26
27 #ifdef BGP
28 #include "bgp.h"
29 #endif
30 /*
31 * All cluster packets have the same format.
32 *
33 * One or more instances of
34 * a 32 bit 'type' id.
35 * a 32 bit 'extra' data dependant on the 'type'.
36 * zero or more bytes of structure data, dependant on the type.
37 *
38 */
39
40 // Module variables.
41 int cluster_sockfd = 0; // The filedescriptor for the cluster communications port.
42
43 ipt my_address = 0; // The network address of my ethernet port.
44 static int walk_session_number = 0; // The next session to send when doing the slow table walk.
45 static int walk_tunnel_number = 0; // The next tunnel to send when doing the slow table walk.
46
47 #define MAX_HEART_SIZE (8192) // Maximum size of heartbeat packet. Must be less than max IP packet size :)
48 #define MAX_CHANGES (MAX_HEART_SIZE/(sizeof(sessiont) + sizeof(int) ) - 2) // Assumes a session is the biggest type!
49
50 static struct {
51 int type;
52 int id;
53 } cluster_changes[MAX_CHANGES]; // Queue of changed structures that need to go out when next heartbeat.
54
55 static struct {
56 int seq;
57 int size;
58 char data[MAX_HEART_SIZE];
59 } past_hearts[HB_HISTORY_SIZE]; // Ring buffer of heartbeats that we've recently sent out. Needed so
60 // we can re-transmit if needed.
61
62 static struct {
63 u32 peer;
64 time_t basetime;
65 clockt timestamp;
66 int uptodate;
67 } peers[CLUSTER_MAX_SIZE]; // List of all the peers we've heard from.
68 static int num_peers; // Number of peers in list.
69
70 int rle_decompress(u8 ** src_p, int ssize, u8 *dst, int dsize);
71 int rle_compress(u8 ** src_p, int ssize, u8 *dst, int dsize);
72
73 //
74 // Create a listening socket
75 //
76 // This joins the cluster multi-cast group.
77 //
78 int cluster_init()
79 {
80 struct sockaddr_in addr;
81 struct sockaddr_in interface_addr;
82 struct ip_mreq mreq;
83 struct ifreq ifr;
84 int opt = 0;
85
86 config->cluster_undefined_sessions = MAXSESSION-1;
87 config->cluster_undefined_tunnels = MAXTUNNEL-1;
88
89 if (!config->cluster_address)
90 return 0;
91 if (!*config->cluster_interface)
92 return 0;
93
94 cluster_sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
95
96 memset(&addr, 0, sizeof(addr));
97 addr.sin_family = AF_INET;
98 addr.sin_port = htons(CLUSTERPORT);
99 addr.sin_addr.s_addr = INADDR_ANY;
100 setsockopt(cluster_sockfd, SOL_SOCKET, SO_REUSEADDR, &addr, sizeof(addr));
101
102 if (bind(cluster_sockfd, (void *) &addr, sizeof(addr)) < 0)
103 {
104 log(0, 0, 0, 0, "Failed to bind cluster socket: %s\n", strerror(errno));
105 return -1;
106 }
107
108 strcpy(ifr.ifr_name, config->cluster_interface);
109 if (ioctl(cluster_sockfd, SIOCGIFADDR, &ifr) < 0) {
110 log(0, 0, 0, 0, "Failed to get interface address for (%s): %s\n", config->cluster_interface, strerror(errno));
111 return -1;
112 }
113
114 memcpy(&interface_addr, &ifr.ifr_addr, sizeof(interface_addr) );
115 my_address = interface_addr.sin_addr.s_addr;
116
117 // Join multicast group.
118 mreq.imr_multiaddr.s_addr = config->cluster_address;
119 mreq.imr_interface = interface_addr.sin_addr;
120
121
122 opt = 0; // Turn off multicast loopback.
123 setsockopt(cluster_sockfd, IPPROTO_IP, IP_MULTICAST_LOOP, &opt, sizeof(opt));
124
125 if (setsockopt(cluster_sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
126 log(0, 0, 0, 0, "Failed to setsockopt (join mcast group): %s\n", strerror(errno));
127 return -1;
128 }
129
130 if (setsockopt (cluster_sockfd, IPPROTO_IP, IP_MULTICAST_IF, &interface_addr, sizeof(interface_addr)) < 0) {
131 log(0, 0, 0, 0, "Failed to setsockopt (set mcast interface): %s\n", strerror(errno));
132 return -1;
133 }
134
135 config->cluster_last_hb = TIME;
136 config->cluster_seq_number = -1;
137
138 return cluster_sockfd;
139 }
140
141
142 //
143 // Send a chunk of data to the entire cluster (usually via the multicast
144 // address ).
145 //
146
147 int cluster_send_data(void *data, int datalen)
148 {
149 struct sockaddr_in addr = {0};
150
151 if (!cluster_sockfd) return -1;
152 if (!config->cluster_address) return 0;
153
154 addr.sin_addr.s_addr = config->cluster_address;
155 addr.sin_port = htons(CLUSTERPORT);
156 addr.sin_family = AF_INET;
157
158 log(5,0,0,0, "Cluster send data: %d bytes\n", datalen);
159
160 if (sendto(cluster_sockfd, data, datalen, MSG_NOSIGNAL, (void *) &addr, sizeof(addr)) < 0)
161 {
162 log(0, 0, 0, 0, "sendto: %s\n", strerror(errno));
163 return -1;
164 }
165
166 return 0;
167 }
168
169 //
170 // Add a chunk of data to a heartbeat packet.
171 // Maintains the format. Assumes that the caller
172 // has passed in a big enough buffer!
173 //
174 static void add_type(char ** p, int type, int more, char * data, int size)
175 {
176 * ( (u32*)(*p) ) = type;
177 *p += sizeof(u32);
178
179 * ( (u32*)(*p) ) = more;
180 *p += sizeof(u32);
181
182 if (data && size > 0) {
183 memcpy(*p, data, size);
184 (*p) += size;
185 }
186 }
187
188 void cluster_uptodate(void)
189 {
190 if (config->cluster_iam_uptodate)
191 return;
192
193 if (config->cluster_undefined_sessions || config->cluster_undefined_tunnels)
194 return;
195
196 config->cluster_iam_uptodate = 1;
197
198 log(0,0,0,0, "Now uptodate with master.\n");
199
200 #ifdef BGP
201 if (bgp_configured)
202 bgp_enable_routing(1);
203 else
204 #endif /* BGP */
205 if (config->send_garp)
206 send_garp(config->bind_address); // Start taking traffic.
207 }
208
209 //
210 // Send a unicast UDP packet to a peer with 'data' as the
211 // contents.
212 //
213 int peer_send_data(u32 peer, char * data, int size)
214 {
215 struct sockaddr_in addr = {0};
216
217 if (!cluster_sockfd) return -1;
218 if (!config->cluster_address) return 0;
219
220 if (!peer) // Odd??
221 return -1;
222
223 addr.sin_addr.s_addr = peer;
224 addr.sin_port = htons(CLUSTERPORT);
225 addr.sin_family = AF_INET;
226
227 log_hex(5, "Peer send", data, size);
228
229 if (sendto(cluster_sockfd, data, size, MSG_NOSIGNAL, (void *) &addr, sizeof(addr)) < 0)
230 {
231 log(0, 0, 0, 0, "sendto: %s\n", strerror(errno));
232 return -1;
233 }
234
235 return 0;
236 }
237
238 //
239 // Send a structured message to a peer with a single element of type 'type'.
240 //
241 int peer_send_message(u32 peer, int type, int more, char * data, int size)
242 {
243 char buf[65536]; // Vast overkill.
244 char * p = buf;
245
246 log(4,0,0,0, "Sending message to peer (type %d, more %d, size %d)\n", type, more, size);
247 add_type(&p, type, more, data, size);
248
249 return peer_send_data(peer, buf, (p-buf) );
250 }
251
252 //
253 // Forward a state changing packet to the master.
254 //
255 // The master just processes the payload as if it had
256 // received it off the tap device.
257 //
258 int master_forward_packet(char * data, int size, u32 addr, int port)
259 {
260 char buf[65536]; // Vast overkill.
261 char * p = buf;
262
263 if (!config->cluster_master_address) // No election has been held yet. Just skip it.
264 return -1;
265
266 log(4,0,0,0, "Forwarding packet from %s to master (size %d)\n", inet_toa(addr), size);
267
268 STAT(c_forwarded);
269 add_type(&p, C_FORWARD, addr, (char*) &port, sizeof(port) );
270 memcpy(p, data, size);
271 p += size;
272
273 return peer_send_data(config->cluster_master_address, buf, (p-buf) );
274
275 }
276
277 //
278 // Forward a throttled packet to the master for handling.
279 //
280 // The master just drops the packet into the appropriate
281 // token bucket queue, and lets normal processing take care
282 // of it.
283 //
284 int master_throttle_packet(int tbfid, char * data, int size)
285 {
286 char buf[65536]; // Vast overkill.
287 char * p = buf;
288
289 if (!config->cluster_master_address) // No election has been held yet. Just skip it.
290 return -1;
291
292 log(4,0,0,0, "Throttling packet master (size %d, tbfid %d)\n", size, tbfid);
293
294 add_type(&p, C_THROTTLE, tbfid, data, size);
295
296 return peer_send_data(config->cluster_master_address, buf, (p-buf) );
297
298 }
299
300 //
301 // Forward a walled garden packet to the master for handling.
302 //
303 // The master just writes the packet straight to the tun
304 // device (where is will normally loop through the
305 // firewall rules, and come back in on the tun device)
306 //
307 // (Note that this must be called with the tun header
308 // as the start of the data).
309 int master_garden_packet(sessionidt s, char *data, int size)
310 {
311 char buf[65536]; // Vast overkill.
312 char *p = buf;
313
314 if (!config->cluster_master_address) // No election has been held yet. Just skip it.
315 return -1;
316
317 log(4,0,0,0, "Walled garden packet to master (size %d)\n", size);
318
319 add_type(&p, C_GARDEN, s, data, size);
320
321 return peer_send_data(config->cluster_master_address, buf, (p-buf));
322
323 }
324
325 //
326 // Send a chunk of data as a heartbeat..
327 // We save it in the history buffer as we do so.
328 //
329 static void send_heartbeat(int seq, char * data, int size)
330 {
331 int i;
332
333 if (size > sizeof(past_hearts[0].data)) {
334 log(0,0,0,0, "Tried to heartbeat something larger than the maximum packet!\n");
335 kill(0, SIGTERM);
336 exit(1);
337 }
338 i = seq % HB_HISTORY_SIZE;
339 past_hearts[i].seq = seq;
340 past_hearts[i].size = size;
341 memcpy(&past_hearts[i].data, data, size); // Save it.
342 cluster_send_data(data, size);
343 }
344
345 //
346 // Send an 'i am alive' message to every machine in the cluster.
347 //
348 void cluster_send_ping(time_t basetime)
349 {
350 char buff[100 + sizeof(pingt)];
351 char *p = buff;
352 pingt x;
353
354 if (config->cluster_iam_master && basetime) // We're heartbeating so no need to ping.
355 return;
356
357 log(5,0,0,0, "Sending cluster ping...\n");
358
359 x.ver = 1;
360 x.addr = config->bind_address;
361 x.undef = config->cluster_undefined_sessions + config->cluster_undefined_tunnels;
362 x.basetime = basetime;
363
364 add_type(&p, C_PING, basetime, (char *) &x, sizeof(x));
365 cluster_send_data(buff, (p-buff) );
366 }
367
368 //
369 // Walk the session counters looking for non-zero ones to send
370 // to the master. We send up to 100 of them at one time.
371 // We examine a maximum of 2000 sessions.
372 // (50k max session should mean that we normally
373 // examine the entire session table every 25 seconds).
374
375 #define MAX_B_RECS (400)
376 void master_update_counts(void)
377 {
378 int i, c;
379 bytest b[MAX_B_RECS+1];
380
381 if (config->cluster_iam_master) // Only happens on the slaves.
382 return;
383
384 if (!config->cluster_master_address) // If we don't have a master, skip it for a while.
385 return;
386
387 i = MAX_B_RECS * 5; // Examine max 2000 sessions;
388 if (config->cluster_highest_sessionid > i)
389 i = config->cluster_highest_sessionid;
390
391 for ( c = 0; i > 0 ; --i) {
392 // Next session to look at.
393 walk_session_number++;
394 if ( walk_session_number > config->cluster_highest_sessionid)
395 walk_session_number = 1;
396
397 if (!sess_count[walk_session_number].cin && !sess_count[walk_session_number].cout)
398 continue; // Unused. Skip it.
399
400 b[c].sid = walk_session_number;
401 b[c].in = sess_count[walk_session_number].cin;
402 b[c].out = sess_count[walk_session_number].cout;
403
404 if (++c > MAX_B_RECS) // Send a max of 400 elements in a packet.
405 break;
406
407 // Reset counters.
408 sess_count[walk_session_number].cin = sess_count[walk_session_number].cout = 0;
409 }
410
411 if (!c) // Didn't find any that changes. Get out of here!
412 return;
413
414
415 // Forward the data to the master.
416 log(4,0,0,0, "Sending byte counters to master (%d elements)\n", c);
417 peer_send_message(config->cluster_master_address, C_BYTES, c, (char*) &b, sizeof(b[0]) * c);
418 return;
419 }
420
421 //
422 // On the master, check how our slaves are going. If
423 // one of them's not up-to-date we'll heartbeat faster.
424 // If we don't have any of them, then we need to turn
425 // on our own packet handling!
426 //
427 void cluster_check_slaves(void)
428 {
429 int i;
430 static int have_peers = 0;
431 int had_peers = have_peers;
432 clockt t = TIME;
433
434 if (!config->cluster_iam_master)
435 return; // Only runs on the master...
436
437 config->cluster_iam_uptodate = 1; // cleared in loop below
438
439 for (i = have_peers = 0; i < num_peers; i++)
440 {
441 if ((peers[i].timestamp + config->cluster_hb_timeout) < t)
442 continue; // Stale peer! Skip them.
443
444 if (!peers[i].basetime)
445 continue; // Shutdown peer! Skip them.
446
447 if (peers[i].uptodate)
448 have_peers = 1;
449
450 if (!peers[i].uptodate)
451 config->cluster_iam_uptodate = 0; // Start fast heartbeats
452 }
453
454 #ifdef BGP
455 // master lost all slaves, need to handle traffic ourself
456 if (bgp_configured && had_peers && !have_peers)
457 bgp_enable_routing(1);
458 else if (bgp_configured && !had_peers && have_peers)
459 bgp_enable_routing(0);
460 #endif /* BGP */
461 }
462
463 //
464 // Check that we have a master. If it's been too
465 // long since we heard from a master then hold an election.
466 //
467 void cluster_check_master(void)
468 {
469 int i, count, tcount, high_sid = 0;
470 int last_free = 0;
471 clockt t = TIME;
472 static int probed = 0;
473
474 if (config->cluster_iam_master)
475 return; // Only runs on the slaves...
476
477 // If the master is late (missed 2 hearbeats by a second and a
478 // hair) it may be that the switch has dropped us from the
479 // multicast group, try unicasting one probe to the master
480 // which will hopefully respond with a unicast heartbeat that
481 // will allow us to limp along until the querier next runs.
482 if (TIME > (config->cluster_last_hb + 2 * config->cluster_hb_interval + 11))
483 {
484 if (!probed && config->cluster_master_address)
485 {
486 probed = 1;
487 log(1, 0, 0, 0, "Heartbeat from master %.1fs late, probing...\n",
488 0.1 * (TIME - (config->cluster_last_hb + config->cluster_hb_interval)));
489
490 peer_send_message(config->cluster_master_address,
491 C_LASTSEEN, config->cluster_seq_number, NULL, 0);
492 }
493 } else { // We got a recent heartbeat; reset the probe flag.
494 probed = 0;
495 }
496
497 if (TIME < (config->cluster_last_hb + config->cluster_hb_timeout))
498 return; // Everything's ok!
499
500 config->cluster_last_hb = TIME + 1; // Just the one election thanks.
501
502 log(0,0,0,0, "Master timed out! Holding election...\n");
503
504 for (i = 0; i < num_peers; i++)
505 {
506 if ((peers[i].timestamp + config->cluster_hb_timeout) < t)
507 continue; // Stale peer! Skip them.
508
509 if (!peers[i].basetime)
510 continue; // Shutdown peer! Skip them.
511
512 if (peers[i].basetime < basetime) {
513 log(1,0,0,0, "Expecting %s to become master\n", inet_toa(peers[i].peer) );
514 return; // They'll win the election. Get out of here.
515 }
516
517 if (peers[i].basetime == basetime &&
518 peers[i].peer > my_address) {
519 log(1,0,0,0, "Expecting %s to become master\n", inet_toa(peers[i].peer) );
520 return; // They'll win the election. Wait for them to come up.
521 }
522 }
523
524 // Wow. it's been ages since I last heard a heartbeat
525 // and I'm better than an of my peers so it's time
526 // to become a master!!!
527
528 config->cluster_iam_master = 1;
529 config->cluster_master_address = 0;
530
531 log(0,0,0,0, "I am declaring myself the master!\n");
532
533 if (config->cluster_seq_number == -1)
534 config->cluster_seq_number = 0;
535
536 //
537 // Go through and mark all the tunnels as defined.
538 // Count the highest used tunnel number as well.
539 //
540 config->cluster_highest_tunnelid = 0;
541 for (i = 0, tcount = 0; i < MAXTUNNEL; ++i) {
542 if (tunnel[i].state == TUNNELUNDEF)
543 tunnel[i].state = TUNNELFREE;
544
545 if (tunnel[i].state != TUNNELFREE && i > config->cluster_highest_tunnelid)
546 config->cluster_highest_tunnelid = i;
547 }
548
549 //
550 // Go through and mark all the sessions as being defined.
551 // reset the idle timeouts.
552 // add temporary byte counters to permanent ones.
553 // Re-string the free list.
554 // Find the ID of the highest session.
555 last_free = 0;
556 high_sid = 0;
557 config->cluster_highest_sessionid = 0;
558 for (i = 0, count = 0; i < MAXSESSION; ++i) {
559 if (session[i].tunnel == T_UNDEF) {
560 session[i].tunnel = T_FREE;
561 ++count;
562 }
563
564 if (session[i].tunnel == T_FREE) { // Unused session. Add to free list.
565 session[last_free].next = i;
566 session[i].next = 0;
567 last_free = i;
568 }
569
570 // Reset all the idle timeouts..
571 session[i].last_packet = time_now;
572
573 // Accumulate un-sent byte counters.
574 session[i].cin += sess_count[i].cin;
575 session[i].cout += sess_count[i].cout;
576 session[i].total_cin += sess_count[i].cin;
577 session[i].total_cout += sess_count[i].cout;
578
579 sess_count[i].cin = sess_count[i].cout = 0;
580
581 session[i].radius = 0; // Reset authentication as the radius blocks aren't up to date.
582
583 if (session[i].sid >= high_sid) // This is different to the index into the session table!!!
584 high_sid = session[i].sid+1;
585
586
587 session[i].tbf_in = session[i].tbf_out = 0; // Remove stale pointers from old master.
588 throttle_session(i, session[i].throttle);
589
590 // I'm unsure about this. --mo
591 // It's potentially a good thing, but it could send a
592 // LOT of packets.
593 // if (session[i].throttle)
594 // cluster_send_session(s); // Tell the slaves about the new tbf indexes.
595
596 if (session[i].tunnel != T_FREE && i > config->cluster_highest_sessionid)
597 config->cluster_highest_sessionid = i;
598
599 }
600
601 session[last_free].next = 0; // End of chain.
602 last_sid = high_sid; // Keep track of the highest used session ID.
603
604 become_master();
605
606 rebuild_address_pool();
607
608 // If we're not the very first master, this is a big issue!
609 if(count>0)
610 log(0,0,0,0, "Warning: Fixed %d uninitialized sessions in becoming master!\n", count);
611
612 config->cluster_undefined_sessions = 0;
613 config->cluster_undefined_tunnels = 0;
614 config->cluster_iam_uptodate = 1; // assume all peers are up-to-date
615
616 // FIXME. We need to fix up the tunnel control message
617 // queue here! There's a number of other variables we
618 // should also update.
619 }
620
621
622 //
623 // Check that our session table is validly matching what the
624 // master has in mind.
625 //
626 // In particular, if we have too many sessions marked 'undefined'
627 // we fix it up here, and we ensure that the 'first free session'
628 // pointer is valid.
629 //
630 static void cluster_check_sessions(int highsession, int freesession_ptr, int hightunnel)
631 {
632 int i;
633
634 sessionfree = freesession_ptr; // Keep the freesession ptr valid.
635
636 if (config->cluster_iam_uptodate)
637 return;
638
639 if (highsession > config->cluster_undefined_sessions && hightunnel > config->cluster_undefined_tunnels)
640 return;
641
642 // Clear out defined sessions, counting the number of
643 // undefs remaining.
644 config->cluster_undefined_sessions = 0;
645 for (i = 1 ; i < MAXSESSION; ++i) {
646 if (i > highsession) {
647 session[i].tunnel = 0; // Defined.
648 continue;
649 }
650 if (session[i].tunnel != T_UNDEF)
651 continue;
652 ++config->cluster_undefined_sessions;
653 }
654
655 // Clear out defined tunnels, counting the number of
656 // undefs remaining.
657 config->cluster_undefined_tunnels = 0;
658 for (i = 1 ; i < MAXTUNNEL; ++i) {
659 if (i > hightunnel) {
660 tunnel[i].state = TUNNELFREE; // Defined.
661 continue;
662 }
663 if (tunnel[i].state != TUNNELUNDEF)
664 continue;
665 ++config->cluster_undefined_tunnels;
666 }
667
668
669 if (config->cluster_undefined_sessions || config->cluster_undefined_tunnels) {
670 log(2,0,0,0, "Cleared undefined sessions/tunnels. %d sess (high %d), %d tunn (high %d)\n",
671 config->cluster_undefined_sessions, highsession, config->cluster_undefined_tunnels, hightunnel);
672 return;
673 }
674
675 // Are we up to date?
676
677 if (!config->cluster_iam_uptodate)
678 cluster_uptodate();
679 }
680
681 int hb_add_type(char **p, int type, int id)
682 {
683 switch (type) {
684 case C_CSESSION: { // Compressed C_SESSION.
685 u8 c[sizeof(sessiont) * 2]; // Bigger than worst case.
686 u8 *d = (u8 *) &session[id];
687 u8 *orig = d;
688 int size;
689
690 size = rle_compress( &d, sizeof(sessiont), c, sizeof(c) );
691
692 // Did we compress the full structure, and is the size actually
693 // reduced??
694 if ( (d - orig) == sizeof(sessiont) && size < sizeof(sessiont) ) {
695 add_type(p, C_CSESSION, id, (char*) c, size);
696 break;
697 }
698 // Failed to compress : Fall through.
699 }
700 case C_SESSION: add_type(p, C_SESSION, id,
701 (char*) &session[id], sizeof(sessiont));
702 break;
703
704 case C_CTUNNEL: { // Compressed C_TUNNEL
705 u8 c[sizeof(tunnelt) * 2]; // Bigger than worst case.
706 u8 *d = (u8 *) &tunnel[id];
707 u8 *orig = d;
708 int size;
709
710 size = rle_compress( &d, sizeof(tunnelt), c, sizeof(c) );
711
712 // Did we compress the full structure, and is the size actually
713 // reduced??
714 if ( (d - orig) == sizeof(tunnelt) && size < sizeof(tunnelt) ) {
715 add_type(p, C_CTUNNEL, id, c, size);
716 break;
717 }
718 // Failed to compress : Fall through.
719 }
720 case C_TUNNEL: add_type(p, C_TUNNEL, id,
721 (char*) &tunnel[id], sizeof(tunnelt));
722 break;
723 default:
724 log(0,0,0,0, "Found an invalid type in heart queue! (%d)\n", type);
725 kill(0, SIGTERM);
726 exit(1);
727 }
728 return 0;
729 }
730
731 //
732 // Send a heartbeat, incidently sending out any queued changes..
733 //
734 void cluster_heartbeat()
735 {
736 int i, count = 0, tcount = 0;
737 char buff[MAX_HEART_SIZE + sizeof(heartt) + sizeof(int) ];
738 heartt h;
739 char *p = buff;
740
741 if (!config->cluster_iam_master) // Only the master does this.
742 return;
743
744 // Fill out the heartbeat header.
745 memset(&h, 0, sizeof(h));
746
747 h.version = HB_VERSION;
748 h.seq = config->cluster_seq_number;
749 h.basetime = basetime;
750 h.clusterid = config->bind_address; // Will this do??
751 h.basetime = basetime;
752 h.highsession = config->cluster_highest_sessionid;
753 h.freesession = sessionfree;
754 h.hightunnel = config->cluster_highest_tunnelid;
755 h.size_sess = sizeof(sessiont); // Just in case.
756 h.size_tunn = sizeof(tunnelt);
757 h.interval = config->cluster_hb_interval;
758 h.timeout = config->cluster_hb_timeout;
759
760 add_type(&p, C_HEARTBEAT, HB_VERSION, (char*) &h, sizeof(h));
761
762 for (i = 0; i < config->cluster_num_changes; ++i) {
763 hb_add_type(&p, cluster_changes[i].type, cluster_changes[i].id);
764 }
765
766 if (p > (buff + sizeof(buff))) { // Did we somehow manage to overun the buffer?
767 log(0,0,0,0, "FATAL: Overran the heartbeat buffer! This is fatal. Exiting. (size %d)\n", p - buff);
768 kill(0, SIGTERM);
769 exit(1);
770 }
771
772 //
773 // Fill out the packet with sessions from the session table...
774 // (not forgetting to leave space so we can get some tunnels in too )
775 while ( (p + sizeof(u32) * 2 + sizeof(sessiont) * 2 ) < (buff + MAX_HEART_SIZE) ) {
776
777 if (!walk_session_number) // session #0 isn't valid.
778 ++walk_session_number;
779
780 if (count >= config->cluster_highest_sessionid) // If we're a small cluster, don't go wild.
781 break;
782
783 hb_add_type(&p, C_CSESSION, walk_session_number);
784 walk_session_number = (1+walk_session_number)%(config->cluster_highest_sessionid+1); // +1 avoids divide by zero.
785
786 ++count; // Count the number of extra sessions we're sending.
787 }
788
789 //
790 // Fill out the packet with tunnels from the tunnel table...
791 // This effectively means we walk the tunnel table more quickly
792 // than the session table. This is good because stuffing up a
793 // tunnel is a much bigger deal than stuffing up a session.
794 //
795 while ( (p + sizeof(u32) * 2 + sizeof(tunnelt) ) < (buff + MAX_HEART_SIZE) ) {
796
797 if (!walk_tunnel_number) // tunnel #0 isn't valid.
798 ++walk_tunnel_number;
799
800 if (tcount >= config->cluster_highest_tunnelid)
801 break;
802
803 hb_add_type(&p, C_CTUNNEL, walk_tunnel_number);
804 walk_tunnel_number = (1+walk_tunnel_number)%(config->cluster_highest_tunnelid+1); // +1 avoids divide by zero.
805
806 ++tcount;
807 }
808
809 //
810 // Did we do something wrong?
811 if (p > (buff + sizeof(buff))) { // Did we somehow manage to overun the buffer?
812 log(0,0,0,0, "Overran the heartbeat buffer now! This is fatal. Exiting. (size %d)\n", p - buff);
813 kill(0, SIGTERM);
814 exit(1);
815 }
816
817 log(3,0,0,0, "Sending heartbeat #%d with %d changes (%d x-sess, %d x-tunnels, %d highsess, %d hightun size %d)\n",
818 h.seq, config->cluster_num_changes, count, tcount, config->cluster_highest_sessionid,
819 config->cluster_highest_tunnelid, (p-buff));
820
821 config->cluster_num_changes = 0;
822
823 send_heartbeat(h.seq, buff, (p-buff) ); // Send out the heartbeat to the cluster, keeping a copy of it.
824
825 config->cluster_seq_number = (config->cluster_seq_number+1)%HB_MAX_SEQ; // Next seq number to use.
826 }
827
828 //
829 // A structure of type 'type' has changed; Add it to the queue to send.
830 //
831 int type_changed(int type, int id)
832 {
833 int i;
834
835 for (i = 0 ; i < config->cluster_num_changes ; ++i)
836 if ( cluster_changes[i].id == id &&
837 cluster_changes[i].type == type)
838 return 0; // Already marked for change.
839
840 cluster_changes[i].type = type;
841 cluster_changes[i].id = id;
842 ++config->cluster_num_changes;
843
844 if (config->cluster_num_changes > MAX_CHANGES)
845 cluster_heartbeat(); // flush now
846
847 return 1;
848 }
849
850
851 // A particular session has been changed!
852 int cluster_send_session(int sid)
853 {
854 if (!config->cluster_iam_master) {
855 log(0,0,sid,0, "I'm not a master, but I just tried to change a session!\n");
856 return -1;
857 }
858
859 return type_changed(C_CSESSION, sid);
860 }
861
862 // A particular tunnel has been changed!
863 int cluster_send_tunnel(int tid)
864 {
865 if (!config->cluster_iam_master) {
866 log(0,0,0,tid, "I'm not a master, but I just tried to change a tunnel!\n");
867 return -1;
868 }
869
870 return type_changed(C_CTUNNEL, tid);
871 }
872
873
874 //
875 // We're a master, and a slave has just told us that it's
876 // missed a packet. We'll resend it every packet since
877 // the last one it's seen.
878 //
879 int cluster_catchup_slave(int seq, u32 slave)
880 {
881 int s;
882 int diff;
883
884 log(1,0,0,0, "Slave %s sent LASTSEEN with seq %d\n", inet_toa(slave), seq);
885
886 diff = config->cluster_seq_number - seq; // How many packet do we need to send?
887 if (diff < 0)
888 diff += HB_MAX_SEQ;
889
890 if (diff >= HB_HISTORY_SIZE) { // Ouch. We don't have the packet to send it!
891 log(0,0,0,0, "A slaved asked for message %d when our seq number is %d. Killing it.\n",
892 seq, config->cluster_seq_number);
893 return peer_send_message(slave, C_KILL, seq, NULL, 0);// Kill the slave. Nothing else to do.
894 }
895
896 // Now resend every packet that it missed, in order.
897 while (seq != config->cluster_seq_number) {
898 s = seq%HB_HISTORY_SIZE;
899 if (seq != past_hearts[s].seq) {
900 log(0,0,0,0, "Tried to re-send heartbeat for %s but %d doesn't match %d! (%d,%d)\n",
901 inet_toa(slave), seq, past_hearts[s].seq, s, config->cluster_seq_number);
902 return -1; // What to do here!?
903 }
904 peer_send_data(slave, past_hearts[s].data, past_hearts[s].size);
905 seq = (seq+1)%HB_MAX_SEQ; // Increment to next seq number.
906 }
907 return 0; // All good!
908 }
909
910 //
911 // We've heard from another peer! Add it to the list
912 // that we select from at election time.
913 //
914 int cluster_add_peer(u32 peer, time_t basetime, pingt *pp, int size)
915 {
916 int i;
917 u32 clusterid;
918 pingt p;
919
920
921 // Allow for backward compatability.
922 // Just the ping packet into a new structure to allow
923 // for the possibility that we might have received
924 // more or fewer elements than we were expecting.
925 if (size > sizeof(p))
926 size = sizeof(p);
927
928 memset( (void*) &p, 0, sizeof(p) );
929 memcpy( (void*) &p, (void*) pp, size);
930
931
932 clusterid = p.addr;
933 if (clusterid != config->bind_address)
934 {
935 // Is this for us?
936 log(4,0,0,0, "Skipping ping from %s (different cluster)\n", inet_toa(peer));
937 return 0;
938 }
939
940 for (i = 0; i < num_peers ; ++i)
941 {
942 if (peers[i].peer != peer)
943 continue;
944
945 // This peer already exists. Just update the timestamp.
946 peers[i].basetime = basetime;
947 peers[i].timestamp = TIME;
948 peers[i].uptodate = !p.undef;
949 break;
950 }
951
952 // Is this the master shutting down??
953 if (peer == config->cluster_master_address && !basetime) {
954 log(3,0,0,0, "Master %s shutting down...\n", inet_toa(config->cluster_master_address));
955 config->cluster_master_address = 0;
956 config->cluster_last_hb = 0; // Force an election.
957 cluster_check_master();
958 return 0;
959 }
960
961 if (i >= num_peers)
962 {
963 log(4,0,0,0, "Adding %s as a peer\n", inet_toa(peer));
964
965 // Not found. Is there a stale slot to re-use?
966 for (i = 0; i < num_peers ; ++i)
967 {
968 if (!peers[i].basetime) // Shutdown
969 break;
970
971 if ((peers[i].timestamp + config->cluster_hb_timeout * 10) < TIME) // Stale.
972 break;
973 }
974
975 if (i >= CLUSTER_MAX_SIZE)
976 {
977 // Too many peers!!
978 log(0,0,0,0, "Tried to add %s as a peer, but I already have %d of them!\n", inet_toa(peer), i);
979 return -1;
980 }
981
982 peers[i].peer = peer;
983 peers[i].basetime = basetime;
984 peers[i].timestamp = TIME;
985 peers[i].uptodate = !p.undef;
986 if (i == num_peers)
987 ++num_peers;
988
989 log(1,0,0,0, "Added %s as a new peer. Now %d peers\n", inet_toa(peer), num_peers);
990 }
991
992 return 1;
993 }
994
995 /* Handle the slave updating the byte counters for the master. */
996 //
997 // Note that we don't mark the session as dirty; We rely on
998 // the slow table walk to propogate this back out to the slaves.
999 //
1000 int cluster_handle_bytes(char * data, int size)
1001 {
1002 bytest * b;
1003
1004 b = (bytest*) data;
1005
1006 log(3,0,0,0, "Got byte counter update (size %d)\n", size);
1007
1008 /* Loop around, adding the byte
1009 counts to each of the sessions. */
1010
1011 while (size >= sizeof(*b) ) {
1012 if (b->sid > MAXSESSION) {
1013 log(0,0,0,0, "Got C_BYTES with session #%d!\n", b->sid);
1014 return -1; /* Abort processing */
1015 }
1016
1017 session[b->sid].total_cin += b->in;
1018 session[b->sid].total_cout += b->out;
1019
1020 session[b->sid].cin += b->in;
1021 session[b->sid].cout += b->out;
1022 session[b->sid].last_packet = time_now; // Reset idle timer!
1023
1024 size -= sizeof(*b);
1025 ++b;
1026 }
1027
1028 if (size != 0)
1029 log(0,0,0,0, "Got C_BYTES with %d bytes of trailing junk!\n", size);
1030
1031 return size;
1032 }
1033
1034 //
1035 // Handle receiving a session structure in a heartbeat packet.
1036 //
1037 static int cluster_recv_session(int more , u8 * p)
1038 {
1039 if (more >= MAXSESSION) {
1040 log(0,0,0,0, "DANGER: Received a heartbeat session id > MAXSESSION!\n");
1041 return -1;
1042 }
1043
1044 if (session[more].tunnel == T_UNDEF) {
1045 if (config->cluster_iam_uptodate) { // Sanity.
1046 log(0,0,0,0, "I thought I was uptodate but I just found an undefined session!\n");
1047 } else {
1048 --config->cluster_undefined_sessions;
1049 }
1050 }
1051
1052 load_session(more, (sessiont*) p); // Copy session into session table..
1053
1054 log(5,0,more,0, "Received session update (%d undef)\n", config->cluster_undefined_sessions);
1055
1056 if (!config->cluster_iam_uptodate)
1057 cluster_uptodate(); // Check to see if we're up to date.
1058
1059 return 0;
1060 }
1061
1062 static int cluster_recv_tunnel(int more, u8 *p)
1063 {
1064 if (more >= MAXTUNNEL) {
1065 log(0,0,0,0, "DANGER: Received a tunnel session id > MAXTUNNEL!\n");
1066 return -1;
1067 }
1068
1069 if (tunnel[more].state == TUNNELUNDEF) {
1070 if (config->cluster_iam_uptodate) { // Sanity.
1071 log(0,0,0,0, "I thought I was uptodate but I just found an undefined tunnel!\n");
1072 } else {
1073 --config->cluster_undefined_tunnels;
1074 }
1075 }
1076
1077 memcpy(&tunnel[more], p, sizeof(tunnel[more]) );
1078
1079 //
1080 // Clear tunnel control messages. These are dynamically allocated.
1081 // If we get unlucky, this may cause the tunnel to drop!
1082 //
1083 tunnel[more].controls = tunnel[more].controle = NULL;
1084 tunnel[more].controlc = 0;
1085
1086 log(5,0,0,more, "Received tunnel update\n");
1087
1088 if (!config->cluster_iam_uptodate)
1089 cluster_uptodate(); // Check to see if we're up to date.
1090
1091 return 0;
1092 }
1093
1094
1095 //
1096 // Process a heartbeat..
1097 //
1098 static int cluster_process_heartbeat(u8 * data, int size, int more, u8 * p, u32 addr)
1099 {
1100 heartt * h;
1101 int s = size - (p-data);
1102 int i, type;
1103
1104 #if HB_VERSION != 3
1105 # error "need to update cluster_process_heartbeat()"
1106 #endif
1107
1108 // we handle version 2+
1109 if (more < 2 || more > HB_VERSION) {
1110 log(0,0,0,0, "Received a heartbeat version that I don't support (%d)!\n", more);
1111 return -1; // Ignore it??
1112 }
1113
1114 // Ok. It's a heartbeat packet from a cluster master!
1115 if (s < sizeof(*h))
1116 goto shortpacket;
1117
1118 h = (heartt*) p;
1119 p += sizeof(*h);
1120 s -= sizeof(*h);
1121
1122 if (h->clusterid != config->bind_address)
1123 return -1; // It's not part of our cluster.
1124
1125 if (config->cluster_iam_master) { // Sanity...
1126 // Note that this MUST match the election process above!
1127
1128 log(0,0,0,0, "I just got a packet claiming to be from a master but _I_ am the master!\n");
1129 if (!h->basetime) {
1130 log(0,0,0,0, "Heartbeat from addr %s with zero basetime!\n", inet_toa(addr) );
1131 return -1; // Skip it.
1132 }
1133 if (basetime > h->basetime) {
1134 log(0,0,0,0, "They're (%s) an older master than me so I'm gone!\n", inet_toa(addr));
1135 kill(0, SIGTERM);
1136 exit(1);
1137 }
1138 if (basetime == h->basetime && my_address < addr) { // Tie breaker.
1139 log(0,0,0,0, "They're a higher IP address than me, so I'm gone!\n");
1140 kill(0, SIGTERM);
1141 exit(1);
1142 }
1143 return -1; // Skip it.
1144 }
1145
1146 if (config->cluster_seq_number == -1) // Don't have one. Just align to the master...
1147 config->cluster_seq_number = h->seq;
1148
1149 config->cluster_last_hb = TIME; // Reset to ensure that we don't become master!!
1150
1151 if (config->cluster_seq_number != h->seq) { // Out of sequence heartbeat!
1152 log(1,0,0,0, "HB: Got seq# %d but was expecting %d. asking for resend.\n", h->seq, config->cluster_seq_number);
1153
1154 peer_send_message(addr, C_LASTSEEN, config->cluster_seq_number, NULL, 0);
1155
1156 config->cluster_last_hb = TIME; // Reset to ensure that we don't become master!!
1157
1158 // Just drop the packet. The master will resend it as part of the catchup.
1159
1160 return 0;
1161 }
1162 // Save the packet in our buffer.
1163 // This is needed in case we become the master.
1164 config->cluster_seq_number = (h->seq+1)%HB_MAX_SEQ;
1165 i = h->seq % HB_HISTORY_SIZE;
1166 past_hearts[i].seq = h->seq;
1167 past_hearts[i].size = size;
1168 memcpy(&past_hearts[i].data, data, size); // Save it.
1169
1170
1171 // Check that we don't have too many undefined sessions, and
1172 // that the free session pointer is correct.
1173 cluster_check_sessions(h->highsession, h->freesession, h->hightunnel);
1174
1175 if (more > 2) // reserved section of heartt was not initialized prior to v3
1176 {
1177 if (h->interval != config->cluster_hb_interval)
1178 {
1179 log(2, 0, 0, 0, "Master set ping/heartbeat interval to %u (was %u)\n",
1180 h->interval, config->cluster_hb_interval);
1181
1182 config->cluster_hb_interval = h->interval;
1183 }
1184
1185 if (h->timeout != config->cluster_hb_timeout)
1186 {
1187 log(2, 0, 0, 0, "Master set heartbeat timeout to %u (was %u)\n",
1188 h->timeout, config->cluster_hb_timeout);
1189
1190 config->cluster_hb_timeout = h->timeout;
1191 }
1192 }
1193
1194 // Ok. process the packet...
1195 while ( s > 0) {
1196
1197 type = * ((u32*) p);
1198 p += sizeof(u32);
1199 s -= sizeof(u32);
1200
1201 more = * ((u32*) p);
1202 p += sizeof(u32);
1203 s -= sizeof(u32);
1204
1205 switch (type) {
1206 case C_CSESSION: { // Compressed session structure.
1207 u8 c [ sizeof(sessiont) + 2];
1208 int size;
1209 u8 * orig_p = p;
1210
1211 size = rle_decompress((u8 **) &p, s, c, sizeof(c) );
1212 s -= (p - orig_p);
1213
1214 if (size != sizeof(sessiont) ) { // Ouch! Very very bad!
1215 log(0,0,0,0, "DANGER: Received a CSESSION that didn't decompress correctly!\n");
1216 // Now what? Should exit! No-longer up to date!
1217 break;
1218 }
1219
1220 cluster_recv_session(more, c);
1221 break;
1222 }
1223 case C_SESSION:
1224 if ( s < sizeof(session[more]))
1225 goto shortpacket;
1226
1227 cluster_recv_session(more, p);
1228
1229 p += sizeof(session[more]);
1230 s -= sizeof(session[more]);
1231 break;
1232
1233 case C_CTUNNEL: { // Compressed tunnel structure.
1234 u8 c [ sizeof(tunnelt) + 2];
1235 int size;
1236 u8 * orig_p = p;
1237
1238 size = rle_decompress( (u8 **) &p, s, c, sizeof(c) );
1239 s -= (p - orig_p);
1240
1241 if (size != sizeof(tunnelt) ) { // Ouch! Very very bad!
1242 log(0,0,0,0, "DANGER: Received a CSESSION that didn't decompress correctly!\n");
1243 // Now what? Should exit! No-longer up to date!
1244 break;
1245 }
1246
1247 cluster_recv_tunnel(more, c);
1248 break;
1249
1250 }
1251 case C_TUNNEL:
1252 if ( s < sizeof(tunnel[more]))
1253 goto shortpacket;
1254
1255 cluster_recv_tunnel(more, p);
1256
1257 p += sizeof(tunnel[more]);
1258 s -= sizeof(tunnel[more]);
1259 break;
1260 default:
1261 log(0,0,0,0, "DANGER: I received a heartbeat element where I didn't understand the type! (%d)\n", type);
1262 return -1; // can't process any more of the packet!!
1263 }
1264 }
1265 if (config->cluster_master_address != addr)
1266 {
1267 char *str;
1268 str = strdup(inet_toa(config->cluster_master_address));
1269 log(0,0,0,0, "My master just changed from %s to %s!\n", str, inet_toa(addr));
1270 if (str) free(str);
1271 }
1272
1273 config->cluster_master_address = addr;
1274 config->cluster_last_hb = TIME; // Successfully received a heartbeat!
1275 return 0;
1276
1277 shortpacket:
1278 log(0,0,0,0, "I got an incomplete heartbeat packet! This means I'm probably out of sync!!\n");
1279 return -1;
1280 }
1281
1282 //
1283 // We got a packet on the cluster port!
1284 // Handle pings, lastseens, and heartbeats!
1285 //
1286 int processcluster(char * data, int size, u32 addr)
1287 {
1288 int type, more;
1289 char * p = data;
1290 int s = size;
1291
1292 if (addr == my_address)
1293 return -1; // Ignore it. Something looped back the multicast!
1294
1295 log(5,0,0,0, "Process cluster: %d bytes from %s\n", size, inet_toa(addr));
1296
1297 if (s <= 0) // Any data there??
1298 return -1;
1299
1300 if (s < 8)
1301 goto shortpacket;
1302
1303 type = * ((u32*) p);
1304 p += sizeof(u32);
1305 s -= sizeof(u32);
1306
1307 more = * ((u32*) p);
1308 p += sizeof(u32);
1309 s -= sizeof(u32);
1310
1311 switch (type) {
1312 case C_PING: // Update the peers table.
1313 return cluster_add_peer(addr, more, (pingt*)p, s);
1314
1315 case C_LASTSEEN: // Catch up a slave (slave missed a packet).
1316 return cluster_catchup_slave(more, addr);
1317
1318 case C_FORWARD: { // Forwarded control packet. pass off to processudp.
1319 struct sockaddr_in a;
1320 a.sin_addr.s_addr = more;
1321
1322 a.sin_port = * (int*) p;
1323 s -= sizeof(int);
1324 p += sizeof(int);
1325
1326 if (!config->cluster_iam_master) { // huh?
1327 log(0,0,0,0, "I'm not the master, but I got a C_FORWARD from %s?\n", inet_toa(addr));
1328 return -1;
1329 }
1330
1331 log(4,0,0,0, "Got a forwarded packet... (%s:%d)\n", inet_toa(more), a.sin_port);
1332 STAT(recv_forward);
1333 processudp(p, s, &a);
1334 return 0;
1335 }
1336 case C_THROTTLE: { // Receive a forwarded packet from a slave.
1337 if (!config->cluster_iam_master) {
1338 log(0,0,0,0, "I'm not the master, but I got a C_THROTTLE from %s?\n", inet_toa(addr));
1339 return -1;
1340 }
1341
1342 tbf_queue_packet(more, p, s); // The TBF id tells wether it goes in or out.
1343 return 0;
1344 }
1345 case C_GARDEN:
1346 // Receive a walled garden packet from a slave.
1347 if (!config->cluster_iam_master) {
1348 log(0,0,0,0, "I'm not the master, but I got a C_GARDEN from %s?\n", inet_toa(addr));
1349 return -1;
1350 }
1351
1352 tun_write(p, s);
1353 return 0;
1354
1355 case C_BYTES:
1356 return cluster_handle_bytes(p, s);
1357
1358 case C_KILL: // The master asked us to die!? (usually because we're too out of date).
1359 if (config->cluster_iam_master) {
1360 log(0,0,0,0, "_I_ am master, but I received a C_KILL from %s! (Seq# %d)\n", inet_toa(addr), more);
1361 return -1;
1362 }
1363 if (more != config->cluster_seq_number) {
1364 log(0,0,0,0, "The master asked us to die but the seq number didn't match!?\n");
1365 return -1;
1366 }
1367
1368 if (addr != config->cluster_master_address) {
1369 log(0,0,0,0, "Received a C_KILL from %s which doesn't match config->cluster_master_address (%x)\n",
1370 inet_toa(addr), config->cluster_master_address);
1371 // We can only warn about it. The master might really have switched!
1372 }
1373
1374 log(0,0,0,0, "Received a valid C_KILL: I'm going to die now.\n");
1375 kill(0, SIGTERM);
1376 exit(0); // Lets be paranoid;
1377 return -1; // Just signalling the compiler.
1378
1379 case C_HEARTBEAT:
1380 log(4,0,0,0, "Got a heartbeat from %s\n", inet_toa(addr));
1381 return cluster_process_heartbeat(data, size, more, p, addr);
1382
1383 default:
1384 log(0,0,0,0, "Strange type packet received on cluster socket (%d)\n", type);
1385 return -1;
1386 }
1387 return 0;
1388
1389 shortpacket:
1390 log(0,0,0,0, "I got an cluster heartbeat packet! This means I'm probably out of sync!!\n");
1391 return -1;
1392 }
1393
1394 //====================================================================================================
1395
1396 int cmd_show_cluster(struct cli_def *cli, char *command, char **argv, int argc)
1397 {
1398 int i;
1399
1400 if (CLI_HELP_REQUESTED)
1401 return CLI_HELP_NO_ARGS;
1402
1403 cli_print(cli, "Cluster status : %s", config->cluster_iam_master ? "Master" : "Slave" );
1404 cli_print(cli, "My address : %s", inet_toa(my_address));
1405 cli_print(cli, "VIP address : %s", inet_toa(config->bind_address));
1406 cli_print(cli, "Multicast address: %s", inet_toa(config->cluster_address));
1407 cli_print(cli, "Multicast i'face : %s", config->cluster_interface);
1408
1409 if (!config->cluster_iam_master) {
1410 cli_print(cli, "My master : %s (last heartbeat %.1f seconds old)",
1411 config->cluster_master_address ? inet_toa(config->cluster_master_address) : "Not defined",
1412 0.1 * (TIME - config->cluster_last_hb));
1413 cli_print(cli, "Uptodate : %s", config->cluster_iam_uptodate ? "Yes" : "No");
1414 cli_print(cli, "Next sequence number expected: %d", config->cluster_seq_number);
1415 cli_print(cli, "%d sessions undefined of %d", config->cluster_undefined_sessions, config->cluster_highest_sessionid);
1416 cli_print(cli, "%d tunnels undefined of %d", config->cluster_undefined_tunnels, config->cluster_highest_tunnelid);
1417 } else {
1418 cli_print(cli, "Next heartbeat # : %d", config->cluster_seq_number);
1419 cli_print(cli, "Highest session : %d", config->cluster_highest_sessionid);
1420 cli_print(cli, "Highest tunnel : %d", config->cluster_highest_tunnelid);
1421 cli_print(cli, "%d changes queued for sending", config->cluster_num_changes);
1422 }
1423 cli_print(cli, "%d peers.", num_peers);
1424
1425 if (num_peers)
1426 cli_print(cli, "%20s %10s %8s", "Address", "Basetime", "Age");
1427 for (i = 0; i < num_peers; ++i) {
1428 cli_print(cli, "%20s %10d %8d", inet_toa(peers[i].peer),
1429 peers[i].basetime, TIME - peers[i].timestamp);
1430 }
1431 return CLI_OK;
1432 }
1433
1434 //
1435 // Simple run-length-encoding compression.
1436 // Format is
1437 // 1 byte < 128 = count of non-zero bytes following. // Not legal to be zero.
1438 // n non-zero bytes;
1439 // or
1440 // 1 byte > 128 = (count - 128) run of zero bytes. //
1441 // repeat.
1442 // count == 0 indicates end of compressed stream.
1443 //
1444 // Compress from 'src' into 'dst'. return number of bytes
1445 // used from 'dst'.
1446 // Updates *src_p to indicate 1 past last bytes used.
1447 //
1448 // We could get an extra byte in the zero runs by storing (count-1)
1449 // but I'm playing it safe.
1450 //
1451 // Worst case is a 50% expansion in space required (trying to
1452 // compress { 0x00, 0x01 } * N )
1453 int rle_compress(u8 ** src_p, int ssize, u8 *dst, int dsize)
1454 {
1455 int count;
1456 int orig_dsize = dsize;
1457 u8 * x,*src;
1458 src = *src_p;
1459
1460 while (ssize > 0 && dsize > 2) {
1461 count = 0;
1462 x = dst++; --dsize; // Reserve space for count byte..
1463
1464 if (*src) { // Copy a run of non-zero bytes.
1465 while (*src && count < 127 && ssize > 0 && dsize > 1) { // Count number of non-zero bytes.
1466 *dst++ = *src++;
1467 --dsize; --ssize;
1468 ++count;
1469 }
1470 *x = count; // Store number of non-zero bytes. Guarenteed to be non-zero!
1471
1472 } else { // Compress a run of zero bytes.
1473 while (*src == 0 && count < 127 && ssize > 0) {
1474 ++src;
1475 --ssize;
1476 ++count;
1477 }
1478 *x = count | 0x80 ;
1479 }
1480 }
1481
1482 *dst++ = 0x0; // Add Stop byte.
1483 --dsize;
1484
1485 *src_p = src;
1486 return (orig_dsize - dsize);
1487 }
1488
1489 //
1490 // Decompress the buffer into **p.
1491 // 'psize' is the size of the decompression buffer available.
1492 //
1493 // Returns the number of bytes decompressed.
1494 //
1495 // Decompresses from '*src_p' into 'dst'.
1496 // Return the number of dst bytes used.
1497 // Updates the 'src_p' pointer to point to the
1498 // first un-used byte.
1499 int rle_decompress(u8 ** src_p, int ssize, u8 *dst, int dsize)
1500 {
1501 int count;
1502 int orig_dsize = dsize;
1503 char * src = *src_p;
1504
1505 while (ssize >0 && dsize > 0) { // While there's more to decompress, and there's room in the decompress buffer...
1506 count = *src++; --ssize; // get the count byte from the source.
1507 if (count == 0x0) // End marker reached? If so, finish.
1508 break;
1509
1510 if (count & 0x80) { // Decompress a run of zeros
1511 for (count &= 0x7f ; count > 0 && dsize > 0; --count) {
1512 *dst++ = 0x0;
1513 --dsize;
1514 }
1515 } else { // Copy run of non-zero bytes.
1516 for ( ; count > 0 && ssize && dsize; --count) { // Copy non-zero bytes across.
1517 *dst++ = *src++;
1518 --ssize; --dsize;
1519 }
1520 }
1521 }
1522 *src_p = src;
1523 return (orig_dsize - dsize);
1524 }