1 // L2TPNS Clustering Stuff
3 char const *cvs_id_cluster
= "$Id: cluster.c,v 1.26.2.11 2005/05/30 02:55:40 bodea Exp $";
12 #include <sys/socket.h>
13 #include <netinet/in.h>
14 #include <arpa/inet.h>
15 #include <sys/ioctl.h>
31 * All cluster packets have the same format.
33 * One or more instances of
35 * a 32 bit 'extra' data dependant on the 'type'.
36 * zero or more bytes of structure data, dependant on the type.
41 int cluster_sockfd
= 0; // The filedescriptor for the cluster communications port.
43 in_addr_t 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.
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!
53 } cluster_changes
[MAX_CHANGES
]; // Queue of changed structures that need to go out when next heartbeat.
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.
67 } peers
[CLUSTER_MAX_SIZE
]; // List of all the peers we've heard from.
68 static int num_peers
; // Number of peers in list.
70 static int rle_decompress(uint8_t **src_p
, int ssize
, uint8_t *dst
, int dsize
);
71 static int rle_compress(uint8_t **src_p
, int ssize
, uint8_t *dst
, int dsize
);
74 // Create a listening socket
76 // This joins the cluster multi-cast group.
80 struct sockaddr_in addr
;
81 struct sockaddr_in interface_addr
;
86 config
->cluster_undefined_sessions
= MAXSESSION
-1;
87 config
->cluster_undefined_tunnels
= MAXTUNNEL
-1;
89 if (!config
->cluster_address
)
91 if (!*config
->cluster_interface
)
94 cluster_sockfd
= socket(AF_INET
, SOCK_DGRAM
, IPPROTO_UDP
);
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
));
102 opt
= fcntl(cluster_sockfd
, F_GETFL
, 0);
103 fcntl(cluster_sockfd
, F_SETFL
, opt
| O_NONBLOCK
);
105 if (bind(cluster_sockfd
, (void *) &addr
, sizeof(addr
)) < 0)
107 LOG(0, 0, 0, "Failed to bind cluster socket: %s\n", strerror(errno
));
111 strcpy(ifr
.ifr_name
, config
->cluster_interface
);
112 if (ioctl(cluster_sockfd
, SIOCGIFADDR
, &ifr
) < 0)
114 LOG(0, 0, 0, "Failed to get interface address for (%s): %s\n", config
->cluster_interface
, strerror(errno
));
118 memcpy(&interface_addr
, &ifr
.ifr_addr
, sizeof(interface_addr
));
119 my_address
= interface_addr
.sin_addr
.s_addr
;
121 // Join multicast group.
122 mreq
.imr_multiaddr
.s_addr
= config
->cluster_address
;
123 mreq
.imr_interface
= interface_addr
.sin_addr
;
126 opt
= 0; // Turn off multicast loopback.
127 setsockopt(cluster_sockfd
, IPPROTO_IP
, IP_MULTICAST_LOOP
, &opt
, sizeof(opt
));
129 if (setsockopt(cluster_sockfd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
, &mreq
, sizeof(mreq
)) < 0)
131 LOG(0, 0, 0, "Failed to setsockopt (join mcast group): %s\n", strerror(errno
));
135 if (setsockopt(cluster_sockfd
, IPPROTO_IP
, IP_MULTICAST_IF
, &interface_addr
, sizeof(interface_addr
)) < 0)
137 LOG(0, 0, 0, "Failed to setsockopt (set mcast interface): %s\n", strerror(errno
));
141 config
->cluster_last_hb
= TIME
;
142 config
->cluster_seq_number
= -1;
144 return cluster_sockfd
;
149 // Send a chunk of data to the entire cluster (usually via the multicast
153 static int cluster_send_data(void *data
, int datalen
)
155 struct sockaddr_in addr
= {0};
157 if (!cluster_sockfd
) return -1;
158 if (!config
->cluster_address
) return 0;
160 addr
.sin_addr
.s_addr
= config
->cluster_address
;
161 addr
.sin_port
= htons(CLUSTERPORT
);
162 addr
.sin_family
= AF_INET
;
164 LOG(5, 0, 0, "Cluster send data: %d bytes\n", datalen
);
166 if (sendto(cluster_sockfd
, data
, datalen
, MSG_NOSIGNAL
, (void *) &addr
, sizeof(addr
)) < 0)
168 LOG(0, 0, 0, "sendto: %s\n", strerror(errno
));
176 // Add a chunk of data to a heartbeat packet.
177 // Maintains the format. Assumes that the caller
178 // has passed in a big enough buffer!
180 static void add_type(char **p
, int type
, int more
, char *data
, int size
)
182 *((uint32_t *) (*p
)) = type
;
183 *p
+= sizeof(uint32_t);
185 *((uint32_t *)(*p
)) = more
;
186 *p
+= sizeof(uint32_t);
188 if (data
&& size
> 0) {
189 memcpy(*p
, data
, size
);
194 // advertise our presence via BGP or gratuitous ARP
195 static void advertise_routes(void)
199 bgp_enable_routing(1);
202 if (config
->send_garp
)
203 send_garp(config
->bind_address
); // Start taking traffic.
206 // withdraw our routes (BGP only)
207 static void withdraw_routes(void)
211 bgp_enable_routing(0);
215 static void cluster_uptodate(void)
217 if (config
->cluster_iam_uptodate
)
220 if (config
->cluster_undefined_sessions
|| config
->cluster_undefined_tunnels
)
223 config
->cluster_iam_uptodate
= 1;
225 LOG(0, 0, 0, "Now uptodate with master.\n");
230 // Send a unicast UDP packet to a peer with 'data' as the
233 static int peer_send_data(in_addr_t peer
, char *data
, int size
)
235 struct sockaddr_in addr
= {0};
237 if (!cluster_sockfd
) return -1;
238 if (!config
->cluster_address
) return 0;
243 addr
.sin_addr
.s_addr
= peer
;
244 addr
.sin_port
= htons(CLUSTERPORT
);
245 addr
.sin_family
= AF_INET
;
247 LOG_HEX(5, "Peer send", data
, size
);
249 if (sendto(cluster_sockfd
, data
, size
, MSG_NOSIGNAL
, (void *) &addr
, sizeof(addr
)) < 0)
251 LOG(0, 0, 0, "sendto: %s\n", strerror(errno
));
259 // Send a structured message to a peer with a single element of type 'type'.
261 static int peer_send_message(in_addr_t peer
, int type
, int more
, char *data
, int size
)
263 char buf
[65536]; // Vast overkill.
266 LOG(4, 0, 0, "Sending message to peer (type %d, more %d, size %d)\n", type
, more
, size
);
267 add_type(&p
, type
, more
, data
, size
);
269 return peer_send_data(peer
, buf
, (p
-buf
) );
273 // Forward a state changing packet to the master.
275 // The master just processes the payload as if it had
276 // received it off the tun device.
278 int master_forward_packet(char *data
, int size
, in_addr_t addr
, int port
)
280 char buf
[65536]; // Vast overkill.
283 if (!config
->cluster_master_address
) // No election has been held yet. Just skip it.
286 LOG(4, 0, 0, "Forwarding packet from %s to master (size %d)\n", fmtaddr(addr
, 0), size
);
289 add_type(&p
, C_FORWARD
, addr
, (char *) &port
, sizeof(port
));
290 memcpy(p
, data
, size
);
293 return peer_send_data(config
->cluster_master_address
, buf
, (p
- buf
));
297 // Forward a throttled packet to the master for handling.
299 // The master just drops the packet into the appropriate
300 // token bucket queue, and lets normal processing take care
303 int master_throttle_packet(int tbfid
, char *data
, int size
)
305 char buf
[65536]; // Vast overkill.
308 if (!config
->cluster_master_address
) // No election has been held yet. Just skip it.
311 LOG(4, 0, 0, "Throttling packet master (size %d, tbfid %d)\n", size
, tbfid
);
313 add_type(&p
, C_THROTTLE
, tbfid
, data
, size
);
315 return peer_send_data(config
->cluster_master_address
, buf
, (p
-buf
) );
320 // Forward a walled garden packet to the master for handling.
322 // The master just writes the packet straight to the tun
323 // device (where is will normally loop through the
324 // firewall rules, and come back in on the tun device)
326 // (Note that this must be called with the tun header
327 // as the start of the data).
328 int master_garden_packet(sessionidt s
, char *data
, int size
)
330 char buf
[65536]; // Vast overkill.
333 if (!config
->cluster_master_address
) // No election has been held yet. Just skip it.
336 LOG(4, 0, 0, "Walled garden packet to master (size %d)\n", size
);
338 add_type(&p
, C_GARDEN
, s
, data
, size
);
340 return peer_send_data(config
->cluster_master_address
, buf
, (p
-buf
));
345 // Send a chunk of data as a heartbeat..
346 // We save it in the history buffer as we do so.
348 static void send_heartbeat(int seq
, char *data
, int size
)
352 if (size
> sizeof(past_hearts
[0].data
))
354 LOG(0, 0, 0, "Tried to heartbeat something larger than the maximum packet!\n");
358 i
= seq
% HB_HISTORY_SIZE
;
359 past_hearts
[i
].seq
= seq
;
360 past_hearts
[i
].size
= size
;
361 memcpy(&past_hearts
[i
].data
, data
, size
); // Save it.
362 cluster_send_data(data
, size
);
366 // Send an 'i am alive' message to every machine in the cluster.
368 void cluster_send_ping(time_t basetime
)
370 char buff
[100 + sizeof(pingt
)];
374 if (config
->cluster_iam_master
&& basetime
) // We're heartbeating so no need to ping.
377 LOG(5, 0, 0, "Sending cluster ping...\n");
380 x
.addr
= config
->bind_address
;
381 x
.undef
= config
->cluster_undefined_sessions
+ config
->cluster_undefined_tunnels
;
382 x
.basetime
= basetime
;
384 add_type(&p
, C_PING
, basetime
, (char *) &x
, sizeof(x
));
385 cluster_send_data(buff
, (p
-buff
) );
389 // Walk the session counters looking for non-zero ones to send
390 // to the master. We send up to 600 of them at one time.
391 // We examine a maximum of 3000 sessions.
392 // (50k max session should mean that we normally
393 // examine the entire session table every 25 seconds).
395 #define MAX_B_RECS (600)
396 void master_update_counts(void)
399 bytest b
[MAX_B_RECS
+1];
401 if (config
->cluster_iam_master
) // Only happens on the slaves.
404 if (!config
->cluster_master_address
) // If we don't have a master, skip it for a while.
407 i
= MAX_B_RECS
* 5; // Examine max 2000 sessions;
408 if (config
->cluster_highest_sessionid
> i
)
409 i
= config
->cluster_highest_sessionid
;
411 for ( c
= 0; i
> 0 ; --i
) {
412 // Next session to look at.
413 walk_session_number
++;
414 if ( walk_session_number
> config
->cluster_highest_sessionid
)
415 walk_session_number
= 1;
417 if (!sess_local
[walk_session_number
].cin
&& !sess_local
[walk_session_number
].cout
)
418 continue; // Unused. Skip it.
420 b
[c
].sid
= walk_session_number
;
421 b
[c
].in
= sess_local
[walk_session_number
].cin
;
422 b
[c
].out
= sess_local
[walk_session_number
].cout
;
424 if (++c
> MAX_B_RECS
) // Send a max of 400 elements in a packet.
428 sess_local
[walk_session_number
].cin
= sess_local
[walk_session_number
].cout
= 0;
431 if (!c
) // Didn't find any that changes. Get out of here!
435 // Forward the data to the master.
436 LOG(4, 0, 0, "Sending byte counters to master (%d elements)\n", c
);
437 peer_send_message(config
->cluster_master_address
, C_BYTES
, c
, (char *) &b
, sizeof(b
[0]) * c
);
442 // On the master, check how our slaves are going. If
443 // one of them's not up-to-date we'll heartbeat faster.
444 // If we don't have any of them, then we need to turn
445 // on our own packet handling!
447 void cluster_check_slaves(void)
450 static int have_peers
= 0;
451 int had_peers
= have_peers
;
454 if (!config
->cluster_iam_master
)
455 return; // Only runs on the master...
457 config
->cluster_iam_uptodate
= 1; // cleared in loop below
459 for (i
= have_peers
= 0; i
< num_peers
; i
++)
461 if ((peers
[i
].timestamp
+ config
->cluster_hb_timeout
) < t
)
462 continue; // Stale peer! Skip them.
464 if (!peers
[i
].basetime
)
465 continue; // Shutdown peer! Skip them.
467 if (peers
[i
].uptodate
)
470 config
->cluster_iam_uptodate
= 0; // Start fast heartbeats
473 // in a cluster, withdraw/add routes when we get a peer/lose peers
474 if (have_peers
!= had_peers
)
476 if (had_peers
< config
->cluster_master_min_adv
&&
477 have_peers
>= config
->cluster_master_min_adv
)
480 else if (had_peers
>= config
->cluster_master_min_adv
&&
481 have_peers
< config
->cluster_master_min_adv
)
487 // Check that we have a master. If it's been too
488 // long since we heard from a master then hold an election.
490 void cluster_check_master(void)
492 int i
, count
, tcount
, high_unique_id
= 0;
495 static int probed
= 0;
498 if (config
->cluster_iam_master
)
499 return; // Only runs on the slaves...
501 // If the master is late (missed 2 hearbeats by a second and a
502 // hair) it may be that the switch has dropped us from the
503 // multicast group, try unicasting probes to the master
504 // which will hopefully respond with a unicast heartbeat that
505 // will allow us to limp along until the querier next runs.
506 if (config
->cluster_master_address
507 && TIME
> (config
->cluster_last_hb
+ 2 * config
->cluster_hb_interval
+ 11))
509 if (!probed
|| (TIME
> (probed
+ 2 * config
->cluster_hb_interval
)))
512 LOG(1, 0, 0, "Heartbeat from master %.1fs late, probing...\n",
513 0.1 * (TIME
- (config
->cluster_last_hb
+ config
->cluster_hb_interval
)));
515 peer_send_message(config
->cluster_master_address
,
516 C_LASTSEEN
, config
->cluster_seq_number
, NULL
, 0);
518 } else { // We got a recent heartbeat; reset the probe flag.
522 if (TIME
< (config
->cluster_last_hb
+ config
->cluster_hb_timeout
))
523 return; // Everything's ok!
525 config
->cluster_last_hb
= TIME
+ 1; // Just the one election thanks.
527 LOG(0, 0, 0, "Master timed out! Holding election...\n");
529 // In the process of shutting down, can't be master
533 for (i
= have_peers
= 0; i
< num_peers
; i
++)
535 if ((peers
[i
].timestamp
+ config
->cluster_hb_timeout
) < t
)
536 continue; // Stale peer! Skip them.
538 if (!peers
[i
].basetime
)
539 continue; // Shutdown peer! Skip them.
541 if (peers
[i
].basetime
< basetime
) {
542 LOG(1, 0, 0, "Expecting %s to become master\n", fmtaddr(peers
[i
].peer
, 0));
543 return; // They'll win the election. Get out of here.
546 if (peers
[i
].basetime
== basetime
&&
547 peers
[i
].peer
> my_address
) {
548 LOG(1, 0, 0, "Expecting %s to become master\n", fmtaddr(peers
[i
].peer
, 0));
549 return; // They'll win the election. Wait for them to come up.
552 if (peers
[i
].uptodate
)
556 // Wow. it's been ages since I last heard a heartbeat
557 // and I'm better than an of my peers so it's time
558 // to become a master!!!
560 config
->cluster_iam_master
= 1;
561 config
->cluster_master_address
= 0;
563 LOG(0, 0, 0, "I am declaring myself the master!\n");
565 if (have_peers
< config
->cluster_master_min_adv
)
570 if (config
->cluster_seq_number
== -1)
571 config
->cluster_seq_number
= 0;
574 // Go through and mark all the tunnels as defined.
575 // Count the highest used tunnel number as well.
577 config
->cluster_highest_tunnelid
= 0;
578 for (i
= 0, tcount
= 0; i
< MAXTUNNEL
; ++i
) {
579 if (tunnel
[i
].state
== TUNNELUNDEF
)
580 tunnel
[i
].state
= TUNNELFREE
;
582 if (tunnel
[i
].state
!= TUNNELFREE
&& i
> config
->cluster_highest_tunnelid
)
583 config
->cluster_highest_tunnelid
= i
;
587 // Go through and mark all the sessions as being defined.
588 // reset the idle timeouts.
589 // add temporary byte counters to permanent ones.
590 // Re-string the free list.
591 // Find the ID of the highest session.
594 config
->cluster_highest_sessionid
= 0;
595 for (i
= 0, count
= 0; i
< MAXSESSION
; ++i
) {
596 if (session
[i
].tunnel
== T_UNDEF
) {
597 session
[i
].tunnel
= T_FREE
;
601 if (!session
[i
].opened
) { // Unused session. Add to free list.
602 memset(&session
[i
], 0, sizeof(session
[i
]));
603 session
[i
].tunnel
= T_FREE
;
604 session
[last_free
].next
= i
;
610 // Reset idle timeouts..
611 session
[i
].last_packet
= time_now
;
613 // Reset die relative to our uptime rather than the old master's
614 if (session
[i
].die
) session
[i
].die
= TIME
;
616 // Accumulate un-sent byte counters.
617 session
[i
].cin
+= sess_local
[i
].cin
;
618 session
[i
].cout
+= sess_local
[i
].cout
;
619 session
[i
].total_cin
+= sess_local
[i
].cin
;
620 session
[i
].total_cout
+= sess_local
[i
].cout
;
622 sess_local
[i
].cin
= sess_local
[i
].cout
= 0;
624 session
[i
].radius
= 0; // Reset authentication as the radius blocks aren't up to date.
626 if (session
[i
].unique_id
>= high_unique_id
) // This is different to the index into the session table!!!
627 high_unique_id
= session
[i
].unique_id
+1;
629 session
[i
].tbf_in
= session
[i
].tbf_out
= 0; // Remove stale pointers from old master.
630 throttle_session(i
, session
[i
].throttle_in
, session
[i
].throttle_out
);
632 config
->cluster_highest_sessionid
= i
;
635 session
[last_free
].next
= 0; // End of chain.
636 last_id
= high_unique_id
; // Keep track of the highest used session ID.
640 rebuild_address_pool();
642 // If we're not the very first master, this is a big issue!
644 LOG(0, 0, 0, "Warning: Fixed %d uninitialized sessions in becoming master!\n", count
);
646 config
->cluster_undefined_sessions
= 0;
647 config
->cluster_undefined_tunnels
= 0;
648 config
->cluster_iam_uptodate
= 1; // assume all peers are up-to-date
650 // FIXME. We need to fix up the tunnel control message
651 // queue here! There's a number of other variables we
652 // should also update.
657 // Check that our session table is validly matching what the
658 // master has in mind.
660 // In particular, if we have too many sessions marked 'undefined'
661 // we fix it up here, and we ensure that the 'first free session'
664 static void cluster_check_sessions(int highsession
, int freesession_ptr
, int hightunnel
)
668 sessionfree
= freesession_ptr
; // Keep the freesession ptr valid.
670 if (config
->cluster_iam_uptodate
)
673 if (highsession
> config
->cluster_undefined_sessions
&& hightunnel
> config
->cluster_undefined_tunnels
)
676 // Clear out defined sessions, counting the number of
678 config
->cluster_undefined_sessions
= 0;
679 for (i
= 1 ; i
< MAXSESSION
; ++i
) {
680 if (i
> highsession
) {
681 if (session
[i
].tunnel
== T_UNDEF
) session
[i
].tunnel
= T_FREE
; // Defined.
685 if (session
[i
].tunnel
== T_UNDEF
)
686 ++config
->cluster_undefined_sessions
;
689 // Clear out defined tunnels, counting the number of
691 config
->cluster_undefined_tunnels
= 0;
692 for (i
= 1 ; i
< MAXTUNNEL
; ++i
) {
693 if (i
> hightunnel
) {
694 if (tunnel
[i
].state
== TUNNELUNDEF
) tunnel
[i
].state
= TUNNELFREE
; // Defined.
698 if (tunnel
[i
].state
== TUNNELUNDEF
)
699 ++config
->cluster_undefined_tunnels
;
703 if (config
->cluster_undefined_sessions
|| config
->cluster_undefined_tunnels
) {
704 LOG(2, 0, 0, "Cleared undefined sessions/tunnels. %d sess (high %d), %d tunn (high %d)\n",
705 config
->cluster_undefined_sessions
, highsession
, config
->cluster_undefined_tunnels
, hightunnel
);
709 // Are we up to date?
711 if (!config
->cluster_iam_uptodate
)
715 static int hb_add_type(char **p
, int type
, int id
)
718 case C_CSESSION
: { // Compressed C_SESSION.
719 uint8_t c
[sizeof(sessiont
) * 2]; // Bigger than worst case.
720 uint8_t *d
= (uint8_t *) &session
[id
];
724 size
= rle_compress( &d
, sizeof(sessiont
), c
, sizeof(c
) );
726 // Did we compress the full structure, and is the size actually
728 if ( (d
- orig
) == sizeof(sessiont
) && size
< sizeof(sessiont
) ) {
729 add_type(p
, C_CSESSION
, id
, (char *) c
, size
);
732 // Failed to compress : Fall through.
734 case C_SESSION
: add_type(p
, C_SESSION
, id
,
735 (char *) &session
[id
], sizeof(sessiont
));
738 case C_CTUNNEL
: { // Compressed C_TUNNEL
739 uint8_t c
[sizeof(tunnelt
) * 2]; // Bigger than worst case.
740 uint8_t *d
= (uint8_t *) &tunnel
[id
];
744 size
= rle_compress( &d
, sizeof(tunnelt
), c
, sizeof(c
) );
746 // Did we compress the full structure, and is the size actually
748 if ( (d
- orig
) == sizeof(tunnelt
) && size
< sizeof(tunnelt
) ) {
749 add_type(p
, C_CTUNNEL
, id
, c
, size
);
752 // Failed to compress : Fall through.
754 case C_TUNNEL
: add_type(p
, C_TUNNEL
, id
,
755 (char *) &tunnel
[id
], sizeof(tunnelt
));
758 LOG(0, 0, 0, "Found an invalid type in heart queue! (%d)\n", type
);
766 // Send a heartbeat, incidently sending out any queued changes..
768 void cluster_heartbeat()
770 int i
, count
= 0, tcount
= 0;
771 char buff
[MAX_HEART_SIZE
+ sizeof(heartt
) + sizeof(int) ];
775 if (!config
->cluster_iam_master
) // Only the master does this.
778 config
->cluster_table_version
+= config
->cluster_num_changes
;
780 // Fill out the heartbeat header.
781 memset(&h
, 0, sizeof(h
));
783 h
.version
= HB_VERSION
;
784 h
.seq
= config
->cluster_seq_number
;
785 h
.basetime
= basetime
;
786 h
.clusterid
= config
->bind_address
; // Will this do??
787 h
.basetime
= basetime
;
788 h
.highsession
= config
->cluster_highest_sessionid
;
789 h
.freesession
= sessionfree
;
790 h
.hightunnel
= config
->cluster_highest_tunnelid
;
791 h
.size_sess
= sizeof(sessiont
); // Just in case.
792 h
.size_tunn
= sizeof(tunnelt
);
793 h
.interval
= config
->cluster_hb_interval
;
794 h
.timeout
= config
->cluster_hb_timeout
;
795 h
.table_version
= config
->cluster_table_version
;
797 add_type(&p
, C_HEARTBEAT
, HB_VERSION
, (char *) &h
, sizeof(h
));
799 for (i
= 0; i
< config
->cluster_num_changes
; ++i
) {
800 hb_add_type(&p
, cluster_changes
[i
].type
, cluster_changes
[i
].id
);
803 if (p
> (buff
+ sizeof(buff
))) { // Did we somehow manage to overun the buffer?
804 LOG(0, 0, 0, "FATAL: Overran the heartbeat buffer! This is fatal. Exiting. (size %d)\n", (int) (p
- buff
));
810 // Fill out the packet with sessions from the session table...
811 // (not forgetting to leave space so we can get some tunnels in too )
812 while ( (p
+ sizeof(uint32_t) * 2 + sizeof(sessiont
) * 2 ) < (buff
+ MAX_HEART_SIZE
) ) {
814 if (!walk_session_number
) // session #0 isn't valid.
815 ++walk_session_number
;
817 if (count
>= config
->cluster_highest_sessionid
) // If we're a small cluster, don't go wild.
820 hb_add_type(&p
, C_CSESSION
, walk_session_number
);
821 walk_session_number
= (1+walk_session_number
)%(config
->cluster_highest_sessionid
+1); // +1 avoids divide by zero.
823 ++count
; // Count the number of extra sessions we're sending.
827 // Fill out the packet with tunnels from the tunnel table...
828 // This effectively means we walk the tunnel table more quickly
829 // than the session table. This is good because stuffing up a
830 // tunnel is a much bigger deal than stuffing up a session.
832 while ( (p
+ sizeof(uint32_t) * 2 + sizeof(tunnelt
) ) < (buff
+ MAX_HEART_SIZE
) ) {
834 if (!walk_tunnel_number
) // tunnel #0 isn't valid.
835 ++walk_tunnel_number
;
837 if (tcount
>= config
->cluster_highest_tunnelid
)
840 hb_add_type(&p
, C_CTUNNEL
, walk_tunnel_number
);
841 walk_tunnel_number
= (1+walk_tunnel_number
)%(config
->cluster_highest_tunnelid
+1); // +1 avoids divide by zero.
847 // Did we do something wrong?
848 if (p
> (buff
+ sizeof(buff
))) { // Did we somehow manage to overun the buffer?
849 LOG(0, 0, 0, "Overran the heartbeat buffer now! This is fatal. Exiting. (size %d)\n", (int) (p
- buff
));
854 LOG(3, 0, 0, "Sending v%d heartbeat #%d, change #%" PRIu64
" with %d changes "
855 "(%d x-sess, %d x-tunnels, %d highsess, %d hightun, size %d)\n",
856 HB_VERSION
, h
.seq
, h
.table_version
, config
->cluster_num_changes
,
857 count
, tcount
, config
->cluster_highest_sessionid
,
858 config
->cluster_highest_tunnelid
, (int) (p
- buff
));
860 config
->cluster_num_changes
= 0;
862 send_heartbeat(h
.seq
, buff
, (p
-buff
) ); // Send out the heartbeat to the cluster, keeping a copy of it.
864 config
->cluster_seq_number
= (config
->cluster_seq_number
+1)%HB_MAX_SEQ
; // Next seq number to use.
868 // A structure of type 'type' has changed; Add it to the queue to send.
870 static int type_changed(int type
, int id
)
874 for (i
= 0 ; i
< config
->cluster_num_changes
; ++i
)
875 if ( cluster_changes
[i
].id
== id
&&
876 cluster_changes
[i
].type
== type
)
877 return 0; // Already marked for change.
879 cluster_changes
[i
].type
= type
;
880 cluster_changes
[i
].id
= id
;
881 ++config
->cluster_num_changes
;
883 if (config
->cluster_num_changes
> MAX_CHANGES
)
884 cluster_heartbeat(); // flush now
890 // A particular session has been changed!
891 int cluster_send_session(int sid
)
893 if (!config
->cluster_iam_master
) {
894 LOG(0, sid
, 0, "I'm not a master, but I just tried to change a session!\n");
898 return type_changed(C_CSESSION
, sid
);
901 // A particular tunnel has been changed!
902 int cluster_send_tunnel(int tid
)
904 if (!config
->cluster_iam_master
) {
905 LOG(0, 0, tid
, "I'm not a master, but I just tried to change a tunnel!\n");
909 return type_changed(C_CTUNNEL
, tid
);
914 // We're a master, and a slave has just told us that it's
915 // missed a packet. We'll resend it every packet since
916 // the last one it's seen.
918 static int cluster_catchup_slave(int seq
, in_addr_t slave
)
923 LOG(1, 0, 0, "Slave %s sent LASTSEEN with seq %d\n", fmtaddr(slave
, 0), seq
);
924 if (!config
->cluster_iam_master
) {
925 LOG(1, 0, 0, "Got LASTSEEN but I'm not a master! Redirecting it to %s.\n",
926 fmtaddr(config
->cluster_master_address
, 0));
928 peer_send_message(slave
, C_MASTER
, config
->cluster_master_address
, NULL
, 0);
932 diff
= config
->cluster_seq_number
- seq
; // How many packet do we need to send?
936 if (diff
>= HB_HISTORY_SIZE
) { // Ouch. We don't have the packet to send it!
937 LOG(0, 0, 0, "A slave asked for message %d when our seq number is %d. Killing it.\n",
938 seq
, config
->cluster_seq_number
);
939 return peer_send_message(slave
, C_KILL
, seq
, NULL
, 0);// Kill the slave. Nothing else to do.
942 LOG(1, 0, 0, "Sending %d catchup packets to slave %s\n", diff
, fmtaddr(slave
, 0) );
944 // Now resend every packet that it missed, in order.
945 while (seq
!= config
->cluster_seq_number
) {
946 s
= seq
% HB_HISTORY_SIZE
;
947 if (seq
!= past_hearts
[s
].seq
) {
948 LOG(0, 0, 0, "Tried to re-send heartbeat for %s but %d doesn't match %d! (%d,%d)\n",
949 fmtaddr(slave
, 0), seq
, past_hearts
[s
].seq
, s
, config
->cluster_seq_number
);
950 return -1; // What to do here!?
952 peer_send_data(slave
, past_hearts
[s
].data
, past_hearts
[s
].size
);
953 seq
= (seq
+1)%HB_MAX_SEQ
; // Increment to next seq number.
955 return 0; // All good!
959 // We've heard from another peer! Add it to the list
960 // that we select from at election time.
962 static int cluster_add_peer(in_addr_t peer
, time_t basetime
, pingt
*pp
, int size
)
968 // Allow for backward compatability.
969 // Just the ping packet into a new structure to allow
970 // for the possibility that we might have received
971 // more or fewer elements than we were expecting.
972 if (size
> sizeof(p
))
975 memset( (void *) &p
, 0, sizeof(p
) );
976 memcpy( (void *) &p
, (void *) pp
, size
);
979 if (clusterid
!= config
->bind_address
)
982 LOG(4, 0, 0, "Skipping ping from %s (different cluster)\n", fmtaddr(peer
, 0));
986 for (i
= 0; i
< num_peers
; ++i
)
988 if (peers
[i
].peer
!= peer
)
991 // This peer already exists. Just update the timestamp.
992 peers
[i
].basetime
= basetime
;
993 peers
[i
].timestamp
= TIME
;
994 peers
[i
].uptodate
= !p
.undef
;
998 // Is this the master shutting down??
999 if (peer
== config
->cluster_master_address
) {
1000 LOG(3, 0, 0, "Master %s %s\n", fmtaddr(config
->cluster_master_address
, 0),
1001 basetime
? "has restarted!" : "shutting down...");
1003 config
->cluster_master_address
= 0;
1004 config
->cluster_last_hb
= 0; // Force an election.
1005 cluster_check_master();
1011 LOG(4, 0, 0, "Adding %s as a peer\n", fmtaddr(peer
, 0));
1013 // Not found. Is there a stale slot to re-use?
1014 for (i
= 0; i
< num_peers
; ++i
)
1016 if (!peers
[i
].basetime
) // Shutdown
1019 if ((peers
[i
].timestamp
+ config
->cluster_hb_timeout
* 10) < TIME
) // Stale.
1023 if (i
>= CLUSTER_MAX_SIZE
)
1026 LOG(0, 0, 0, "Tried to add %s as a peer, but I already have %d of them!\n", fmtaddr(peer
, 0), i
);
1030 peers
[i
].peer
= peer
;
1031 peers
[i
].basetime
= basetime
;
1032 peers
[i
].timestamp
= TIME
;
1033 peers
[i
].uptodate
= !p
.undef
;
1037 LOG(1, 0, 0, "Added %s as a new peer. Now %d peers\n", fmtaddr(peer
, 0), num_peers
);
1043 // A slave responds with C_MASTER when it gets a message which should have gone to a master.
1044 static int cluster_set_master(in_addr_t peer
, in_addr_t master
)
1046 if (config
->cluster_iam_master
) // Sanity...
1049 LOG(3, 0, 0, "Peer %s set the master to %s...\n", fmtaddr(peer
, 0),
1050 fmtaddr(master
, 1));
1052 config
->cluster_master_address
= master
;
1053 cluster_check_master();
1057 /* Handle the slave updating the byte counters for the master. */
1059 // Note that we don't mark the session as dirty; We rely on
1060 // the slow table walk to propogate this back out to the slaves.
1062 static int cluster_handle_bytes(char *data
, int size
)
1066 b
= (bytest
*) data
;
1068 LOG(3, 0, 0, "Got byte counter update (size %d)\n", size
);
1070 /* Loop around, adding the byte
1071 counts to each of the sessions. */
1073 while (size
>= sizeof(*b
) ) {
1074 if (b
->sid
> MAXSESSION
) {
1075 LOG(0, 0, 0, "Got C_BYTES with session #%d!\n", b
->sid
);
1076 return -1; /* Abort processing */
1079 session
[b
->sid
].total_cin
+= b
->in
;
1080 session
[b
->sid
].total_cout
+= b
->out
;
1082 session
[b
->sid
].cin
+= b
->in
;
1083 session
[b
->sid
].cout
+= b
->out
;
1086 session
[b
->sid
].last_packet
= time_now
; // Reset idle timer!
1093 LOG(0, 0, 0, "Got C_BYTES with %d bytes of trailing junk!\n", size
);
1099 // Handle receiving a session structure in a heartbeat packet.
1101 static int cluster_recv_session(int more
, uint8_t *p
)
1103 if (more
>= MAXSESSION
) {
1104 LOG(0, 0, 0, "DANGER: Received a heartbeat session id > MAXSESSION!\n");
1108 if (session
[more
].tunnel
== T_UNDEF
) {
1109 if (config
->cluster_iam_uptodate
) { // Sanity.
1110 LOG(0, 0, 0, "I thought I was uptodate but I just found an undefined session!\n");
1112 --config
->cluster_undefined_sessions
;
1116 load_session(more
, (sessiont
*) p
); // Copy session into session table..
1118 LOG(5, more
, 0, "Received session update (%d undef)\n", config
->cluster_undefined_sessions
);
1120 if (!config
->cluster_iam_uptodate
)
1121 cluster_uptodate(); // Check to see if we're up to date.
1126 static int cluster_recv_tunnel(int more
, uint8_t *p
)
1128 if (more
>= MAXTUNNEL
) {
1129 LOG(0, 0, 0, "DANGER: Received a tunnel session id > MAXTUNNEL!\n");
1133 if (tunnel
[more
].state
== TUNNELUNDEF
) {
1134 if (config
->cluster_iam_uptodate
) { // Sanity.
1135 LOG(0, 0, 0, "I thought I was uptodate but I just found an undefined tunnel!\n");
1137 --config
->cluster_undefined_tunnels
;
1141 memcpy(&tunnel
[more
], p
, sizeof(tunnel
[more
]) );
1144 // Clear tunnel control messages. These are dynamically allocated.
1145 // If we get unlucky, this may cause the tunnel to drop!
1147 tunnel
[more
].controls
= tunnel
[more
].controle
= NULL
;
1148 tunnel
[more
].controlc
= 0;
1150 LOG(5, 0, more
, "Received tunnel update\n");
1152 if (!config
->cluster_iam_uptodate
)
1153 cluster_uptodate(); // Check to see if we're up to date.
1160 // Process a heartbeat..
1162 // v3: added interval, timeout
1163 // v4: added table_version
1164 static int cluster_process_heartbeat(uint8_t *data
, int size
, int more
, uint8_t *p
, in_addr_t addr
)
1167 int s
= size
- (p
-data
);
1171 # error "need to update cluster_process_heartbeat()"
1174 // we handle versions 3 through 4
1175 if (more
< 3 || more
> HB_VERSION
) {
1176 LOG(0, 0, 0, "Received a heartbeat version that I don't support (%d)!\n", more
);
1177 return -1; // Ignore it??
1180 // Ok. It's a heartbeat packet from a cluster master!
1188 if (h
->clusterid
!= config
->bind_address
)
1189 return -1; // It's not part of our cluster.
1191 if (config
->cluster_iam_master
) { // Sanity...
1192 // Note that this MUST match the election process above!
1194 LOG(0, 0, 0, "I just got a heartbeat from master %s, but _I_ am the master!\n", fmtaddr(addr
, 0));
1196 LOG(0, 0, 0, "Heartbeat with zero basetime! Ignoring\n");
1197 return -1; // Skip it.
1201 if (h
->table_version
> config
->cluster_table_version
) {
1202 LOG(0, 0, 0, "They've seen more state changes (%" PRIu64
" vs my %" PRIu64
") so I'm gone!\n",
1203 h
->table_version
, config
->cluster_table_version
);
1208 if (h
->table_version
< config
->cluster_table_version
)
1212 if (basetime
> h
->basetime
) {
1213 LOG(0, 0, 0, "They're an older master than me so I'm gone!\n");
1218 if (basetime
< h
->basetime
)
1221 if (my_address
< addr
) { // Tie breaker.
1222 LOG(0, 0, 0, "They're a higher IP address than me, so I'm gone!\n");
1228 // Send it a unicast heartbeat to see give it a chance to die.
1229 // NOTE: It's actually safe to do seq-number - 1 without checking
1232 cluster_catchup_slave(config
->cluster_seq_number
- 1, addr
);
1234 return -1; // Skip it.
1238 // Try and guard against a stray master appearing.
1240 // Ignore heartbeats received from another master before the
1241 // timeout (less a smidgen) for the old master has elapsed.
1243 // Note that after a clean failover, the cluster_master_address
1244 // is cleared, so this doesn't run.
1246 if (config
->cluster_master_address
&& addr
!= config
->cluster_master_address
1247 && (config
->cluster_last_hb
+ config
->cluster_hb_timeout
- 11) > TIME
) {
1248 LOG(0, 0, 0, "Ignoring stray heartbeat from %s, current master %s has not yet timed out (last heartbeat %.1f seconds ago).\n",
1249 fmtaddr(addr
, 0), fmtaddr(config
->cluster_master_address
, 1),
1250 0.1 * (TIME
- config
->cluster_last_hb
));
1251 return -1; // ignore
1254 if (config
->cluster_seq_number
== -1) // Don't have one. Just align to the master...
1255 config
->cluster_seq_number
= h
->seq
;
1257 config
->cluster_last_hb
= TIME
; // Reset to ensure that we don't become master!!
1259 if (config
->cluster_seq_number
!= h
->seq
) { // Out of sequence heartbeat!
1260 static int lastseen_seq
= 0;
1261 static time_t lastseen_time
= 0;
1263 // limit to once per second for a particular seq#
1264 int ask
= (config
->cluster_seq_number
!= lastseen_seq
|| time_now
!= lastseen_time
);
1266 LOG(1, 0, 0, "HB: Got seq# %d but was expecting %d. %s.\n",
1267 h
->seq
, config
->cluster_seq_number
,
1268 ask
? "Asking for resend" : "Ignoring");
1272 lastseen_seq
= config
->cluster_seq_number
;
1273 lastseen_time
= time_now
;
1274 peer_send_message(addr
, C_LASTSEEN
, config
->cluster_seq_number
, NULL
, 0);
1277 config
->cluster_last_hb
= TIME
; // Reset to ensure that we don't become master!!
1279 // Just drop the packet. The master will resend it as part of the catchup.
1283 // Save the packet in our buffer.
1284 // This is needed in case we become the master.
1285 config
->cluster_seq_number
= (h
->seq
+1)%HB_MAX_SEQ
;
1286 i
= h
->seq
% HB_HISTORY_SIZE
;
1287 past_hearts
[i
].seq
= h
->seq
;
1288 past_hearts
[i
].size
= size
;
1289 memcpy(&past_hearts
[i
].data
, data
, size
); // Save it.
1292 // Check that we don't have too many undefined sessions, and
1293 // that the free session pointer is correct.
1294 cluster_check_sessions(h
->highsession
, h
->freesession
, h
->hightunnel
);
1296 if (h
->interval
!= config
->cluster_hb_interval
)
1298 LOG(2, 0, 0, "Master set ping/heartbeat interval to %u (was %u)\n",
1299 h
->interval
, config
->cluster_hb_interval
);
1301 config
->cluster_hb_interval
= h
->interval
;
1304 if (h
->timeout
!= config
->cluster_hb_timeout
)
1306 LOG(2, 0, 0, "Master set heartbeat timeout to %u (was %u)\n",
1307 h
->timeout
, config
->cluster_hb_timeout
);
1309 config
->cluster_hb_timeout
= h
->timeout
;
1312 // Ok. process the packet...
1315 type
= *((uint32_t *) p
);
1316 p
+= sizeof(uint32_t);
1317 s
-= sizeof(uint32_t);
1319 more
= *((uint32_t *) p
);
1320 p
+= sizeof(uint32_t);
1321 s
-= sizeof(uint32_t);
1324 case C_CSESSION
: { // Compressed session structure.
1325 uint8_t c
[ sizeof(sessiont
) + 2];
1327 uint8_t *orig_p
= p
;
1329 size
= rle_decompress((uint8_t **) &p
, s
, c
, sizeof(c
) );
1332 if (size
!= sizeof(sessiont
) ) { // Ouch! Very very bad!
1333 LOG(0, 0, 0, "DANGER: Received a CSESSION that didn't decompress correctly!\n");
1334 // Now what? Should exit! No-longer up to date!
1338 cluster_recv_session(more
, c
);
1342 if ( s
< sizeof(session
[more
]))
1345 cluster_recv_session(more
, p
);
1347 p
+= sizeof(session
[more
]);
1348 s
-= sizeof(session
[more
]);
1351 case C_CTUNNEL
: { // Compressed tunnel structure.
1352 uint8_t c
[ sizeof(tunnelt
) + 2];
1354 uint8_t *orig_p
= p
;
1356 size
= rle_decompress((uint8_t **) &p
, s
, c
, sizeof(c
));
1359 if (size
!= sizeof(tunnelt
) ) { // Ouch! Very very bad!
1360 LOG(0, 0, 0, "DANGER: Received a CSESSION that didn't decompress correctly!\n");
1361 // Now what? Should exit! No-longer up to date!
1365 cluster_recv_tunnel(more
, c
);
1370 if ( s
< sizeof(tunnel
[more
]))
1373 cluster_recv_tunnel(more
, p
);
1375 p
+= sizeof(tunnel
[more
]);
1376 s
-= sizeof(tunnel
[more
]);
1379 LOG(0, 0, 0, "DANGER: I received a heartbeat element where I didn't understand the type! (%d)\n", type
);
1380 return -1; // can't process any more of the packet!!
1384 if (config
->cluster_master_address
!= addr
)
1386 LOG(0, 0, 0, "My master just changed from %s to %s!\n",
1387 fmtaddr(config
->cluster_master_address
, 0), fmtaddr(addr
, 1));
1389 config
->cluster_master_address
= addr
;
1392 config
->cluster_last_hb
= TIME
; // Successfully received a heartbeat!
1393 config
->cluster_table_version
= h
->table_version
;
1397 LOG(0, 0, 0, "I got an incomplete heartbeat packet! This means I'm probably out of sync!!\n");
1402 // We got a packet on the cluster port!
1403 // Handle pings, lastseens, and heartbeats!
1405 int processcluster(char *data
, int size
, in_addr_t addr
)
1411 if (addr
== my_address
)
1412 return -1; // Ignore it. Something looped back the multicast!
1414 LOG(5, 0, 0, "Process cluster: %d bytes from %s\n", size
, fmtaddr(addr
, 0));
1416 if (s
<= 0) // Any data there??
1422 type
= *((uint32_t *) p
);
1423 p
+= sizeof(uint32_t);
1424 s
-= sizeof(uint32_t);
1426 more
= *((uint32_t *) p
);
1427 p
+= sizeof(uint32_t);
1428 s
-= sizeof(uint32_t);
1431 case C_PING
: // Update the peers table.
1432 return cluster_add_peer(addr
, more
, (pingt
*) p
, s
);
1434 case C_MASTER
: // Our master is wrong
1435 return cluster_set_master(addr
, more
);
1437 case C_LASTSEEN
: // Catch up a slave (slave missed a packet).
1438 return cluster_catchup_slave(more
, addr
);
1440 case C_FORWARD
: { // Forwarded control packet. pass off to processudp.
1441 struct sockaddr_in a
;
1442 a
.sin_addr
.s_addr
= more
;
1444 a
.sin_port
= *(int *) p
;
1448 if (!config
->cluster_iam_master
) { // huh?
1449 LOG(0, 0, 0, "I'm not the master, but I got a C_FORWARD from %s?\n", fmtaddr(addr
, 0));
1453 LOG(4, 0, 0, "Got a forwarded packet... (%s:%d)\n", fmtaddr(more
, 0), a
.sin_port
);
1455 processudp(p
, s
, &a
);
1458 case C_THROTTLE
: { // Receive a forwarded packet from a slave.
1459 if (!config
->cluster_iam_master
) {
1460 LOG(0, 0, 0, "I'm not the master, but I got a C_THROTTLE from %s?\n", fmtaddr(addr
, 0));
1464 tbf_queue_packet(more
, p
, s
); // The TBF id tells wether it goes in or out.
1468 // Receive a walled garden packet from a slave.
1469 if (!config
->cluster_iam_master
) {
1470 LOG(0, 0, 0, "I'm not the master, but I got a C_GARDEN from %s?\n", fmtaddr(addr
, 0));
1478 if (!config
->cluster_iam_master
) {
1479 LOG(0, 0, 0, "I'm not the master, but I got a C_BYTES from %s?\n", fmtaddr(addr
, 0));
1483 return cluster_handle_bytes(p
, s
);
1485 case C_KILL
: // The master asked us to die!? (usually because we're too out of date).
1486 if (config
->cluster_iam_master
) {
1487 LOG(0, 0, 0, "_I_ am master, but I received a C_KILL from %s! (Seq# %d)\n", fmtaddr(addr
, 0), more
);
1490 if (more
!= config
->cluster_seq_number
) {
1491 LOG(0, 0, 0, "The master asked us to die but the seq number didn't match!?\n");
1495 if (addr
!= config
->cluster_master_address
) {
1496 LOG(0, 0, 0, "Received a C_KILL from %s which doesn't match config->cluster_master_address (%s)\n",
1497 fmtaddr(addr
, 0), fmtaddr(config
->cluster_master_address
, 1));
1498 // We can only warn about it. The master might really have switched!
1501 LOG(0, 0, 0, "Received a valid C_KILL: I'm going to die now.\n");
1503 exit(0); // Lets be paranoid;
1504 return -1; // Just signalling the compiler.
1507 LOG(4, 0, 0, "Got a heartbeat from %s\n", fmtaddr(addr
, 0));
1508 return cluster_process_heartbeat(data
, size
, more
, p
, addr
);
1511 LOG(0, 0, 0, "Strange type packet received on cluster socket (%d)\n", type
);
1517 LOG(0, 0, 0, "I got a _short_ cluster heartbeat packet! This means I'm probably out of sync!!\n");
1521 //====================================================================================================
1523 int cmd_show_cluster(struct cli_def
*cli
, char *command
, char **argv
, int argc
)
1527 if (CLI_HELP_REQUESTED
)
1528 return CLI_HELP_NO_ARGS
;
1530 cli_print(cli
, "Cluster status : %s", config
->cluster_iam_master
? "Master" : "Slave" );
1531 cli_print(cli
, "My address : %s", fmtaddr(my_address
, 0));
1532 cli_print(cli
, "VIP address : %s", fmtaddr(config
->bind_address
, 0));
1533 cli_print(cli
, "Multicast address: %s", fmtaddr(config
->cluster_address
, 0));
1534 cli_print(cli
, "Multicast i'face : %s", config
->cluster_interface
);
1536 if (!config
->cluster_iam_master
) {
1537 cli_print(cli
, "My master : %s (last heartbeat %.1f seconds old)",
1538 config
->cluster_master_address
1539 ? fmtaddr(config
->cluster_master_address
, 0)
1541 0.1 * (TIME
- config
->cluster_last_hb
));
1542 cli_print(cli
, "Uptodate : %s", config
->cluster_iam_uptodate
? "Yes" : "No");
1543 cli_print(cli
, "Table version # : %" PRIu64
, config
->cluster_table_version
);
1544 cli_print(cli
, "Next sequence number expected: %d", config
->cluster_seq_number
);
1545 cli_print(cli
, "%d sessions undefined of %d", config
->cluster_undefined_sessions
, config
->cluster_highest_sessionid
);
1546 cli_print(cli
, "%d tunnels undefined of %d", config
->cluster_undefined_tunnels
, config
->cluster_highest_tunnelid
);
1548 cli_print(cli
, "Table version # : %" PRIu64
, config
->cluster_table_version
);
1549 cli_print(cli
, "Next heartbeat # : %d", config
->cluster_seq_number
);
1550 cli_print(cli
, "Highest session : %d", config
->cluster_highest_sessionid
);
1551 cli_print(cli
, "Highest tunnel : %d", config
->cluster_highest_tunnelid
);
1552 cli_print(cli
, "%d changes queued for sending", config
->cluster_num_changes
);
1554 cli_print(cli
, "%d peers.", num_peers
);
1557 cli_print(cli
, "%20s %10s %8s", "Address", "Basetime", "Age");
1558 for (i
= 0; i
< num_peers
; ++i
) {
1559 cli_print(cli
, "%20s %10u %8d", fmtaddr(peers
[i
].peer
, 0),
1560 peers
[i
].basetime
, TIME
- peers
[i
].timestamp
);
1566 // Simple run-length-encoding compression.
1568 // 1 byte < 128 = count of non-zero bytes following. // Not legal to be zero.
1569 // n non-zero bytes;
1571 // 1 byte > 128 = (count - 128) run of zero bytes. //
1573 // count == 0 indicates end of compressed stream.
1575 // Compress from 'src' into 'dst'. return number of bytes
1577 // Updates *src_p to indicate 1 past last bytes used.
1579 // We could get an extra byte in the zero runs by storing (count-1)
1580 // but I'm playing it safe.
1582 // Worst case is a 50% expansion in space required (trying to
1583 // compress { 0x00, 0x01 } * N )
1584 static int rle_compress(uint8_t **src_p
, int ssize
, uint8_t *dst
, int dsize
)
1587 int orig_dsize
= dsize
;
1591 while (ssize
> 0 && dsize
> 2) {
1593 x
= dst
++; --dsize
; // Reserve space for count byte..
1595 if (*src
) { // Copy a run of non-zero bytes.
1596 while (*src
&& count
< 127 && ssize
> 0 && dsize
> 1) { // Count number of non-zero bytes.
1601 *x
= count
; // Store number of non-zero bytes. Guarenteed to be non-zero!
1603 } else { // Compress a run of zero bytes.
1604 while (*src
== 0 && count
< 127 && ssize
> 0) {
1613 *dst
++ = 0x0; // Add Stop byte.
1617 return (orig_dsize
- dsize
);
1621 // Decompress the buffer into **p.
1622 // 'psize' is the size of the decompression buffer available.
1624 // Returns the number of bytes decompressed.
1626 // Decompresses from '*src_p' into 'dst'.
1627 // Return the number of dst bytes used.
1628 // Updates the 'src_p' pointer to point to the
1629 // first un-used byte.
1630 static int rle_decompress(uint8_t **src_p
, int ssize
, uint8_t *dst
, int dsize
)
1633 int orig_dsize
= dsize
;
1636 while (ssize
>0 && dsize
> 0) { // While there's more to decompress, and there's room in the decompress buffer...
1637 count
= *src
++; --ssize
; // get the count byte from the source.
1638 if (count
== 0x0) // End marker reached? If so, finish.
1641 if (count
& 0x80) { // Decompress a run of zeros
1642 for (count
&= 0x7f ; count
> 0 && dsize
> 0; --count
) {
1646 } else { // Copy run of non-zero bytes.
1647 for ( ; count
> 0 && ssize
&& dsize
; --count
) { // Copy non-zero bytes across.
1654 return (orig_dsize
- dsize
);