1 /* This file is part of the Project Athena Zephyr Notification System.
2 * It contains functions for communication with other servers.
4 * Created by: John T. Kohl
6 * $Source: /afs/dev.mit.edu/source/repository/athena/lib/zephyr/server/server.c,v $
9 * Copyright (c) 1987, 1991 by the Massachusetts Institute of Technology.
10 * For copying and distribution information, see the file
14 #include <zephyr/mit-copyright.h>
16 #include <sys/socket.h>
20 static const char rcsid_server_c[] = "$Id$";
24 #define SRV_NACKTAB_HASHSIZE 1023
25 #define SRV_NACKTAB_HASHVAL(which, uid) (((which) ^ (uid).zuid_addr.s_addr ^ \
26 (uid).tv.tv_sec ^ (uid).tv.tv_usec) \
27 % SRV_NACKTAB_HASHSIZE)
29 * Server manager. Deal with traffic to and from other servers.
33 * void server_shutdown()
35 * void server_timo(which)
38 * void server_dispatch(notice, auth, who)
41 * struct sockaddr_in *who;
43 * void server_recover(client)
46 * void server_adispatch(notice, auth, who, server)
49 * struct sockaddr_in *who;
52 * void server_forward(notice, auth, who)
55 * struct sockaddr_in *who;
57 * Server *server_which_server(who)
58 * struct sockaddr_in *who;
60 * void server_kill_clt(client);
63 * void server_dump_servers(fp);
66 * void server_reset();
69 static void server_flush __P((Server *));
70 static void hello_respond __P((struct sockaddr_in *, int, int));
71 static void srv_responded __P((struct sockaddr_in *));
72 static void send_msg __P((struct sockaddr_in *, char *, int));
73 static void send_msg_list __P((struct sockaddr_in *, char *, char **, int,
75 static void srv_nack_cancel __P((ZNotice_t *, struct sockaddr_in *));
76 static void srv_nack_release __P((Server *));
77 static void srv_nack_renumber __P((int *));
78 static void send_stats __P((struct sockaddr_in *));
79 static void server_queue __P((Server *, int, void *, int,
80 struct sockaddr_in *));
81 static void server_hello __P((Server *, int));
82 static void setup_server __P((Server *, struct in_addr *));
83 static void srv_rexmit __P((void *));
84 static void server_forw_reliable __P((Server *, caddr_t, int, ZNotice_t *));
85 static Code_t admin_dispatch __P((ZNotice_t *, int, struct sockaddr_in *,
87 static Code_t kill_clt __P((ZNotice_t *, Server *));
88 static Code_t extract_addr __P((ZNotice_t *, struct sockaddr_in *));
91 static Code_t server_register();
94 static struct in_addr *get_server_addrs __P((int *number));
95 static char **get_server_list __P((char *file));
96 static char **get_single_server __P((void));
97 static void free_server_list __P((char **list));
99 static Unacked *srv_nacktab[SRV_NACKTAB_HASHSIZE];
100 Server *otherservers; /* points to an array of the known
102 int nservers; /* number of other servers */
103 int me_server_idx; /* # of my entry in the array */
105 #define ADJUST (1) /* adjust timeout on hello input */
106 #define DONT_ADJUST (0) /* don't adjust timeout */
108 /* parameters controlling the transitions of the FSM's--patchable with adb */
109 long timo_up = TIMO_UP;
110 long timo_tardy = TIMO_TARDY;
111 long timo_dead = TIMO_DEAD;
113 /* counters to measure old protocol use */
115 int old_compat_count_uloc = 0;
116 int old_compat_count_ulocate = 0;
117 int old_compat_count_subscr = 0;
118 #endif /* OLD_COMPAT */
120 int new_compat_count_uloc = 0;
121 int new_compat_count_subscr = 0;
122 #endif /* NEW_COMPAT */
128 * Initialize the array of servers. The `limbo' server goes in the first
129 * slot (otherservers[0]).
130 * Contact Hesiod to find all the other servers, allocate space for the
131 * structure, initialize them all to SERV_DEAD with expired timeouts.
132 * Set up a list header for server_forward retransmits.
139 struct in_addr *serv_addr, *server_addrs, limbo_addr;
141 /* we don't need to mask SIGFPE here since when we are called,
142 the signal handler isn't set up yet. */
144 /* talk to hesiod here, set nservers */
145 server_addrs = get_server_addrs(&nservers);
147 syslog(LOG_ERR, "No servers?!?");
156 /* increment servers to make room for 'limbo' */
159 otherservers = (Server *) malloc(nservers * sizeof(Server));
163 limbo_addr.s_addr = 0;
164 setup_server(otherservers, &limbo_addr);
165 timer_reset(otherservers[0].timer);
166 otherservers[0].timer = NULL;
167 otherservers[0].queue = NULL;
168 otherservers[0].dumping = 0;
170 for (serv_addr = server_addrs, i = 1; i < nservers; serv_addr++, i++) {
171 setup_server(&otherservers[i], serv_addr);
173 if (serv_addr->s_addr == my_addr.s_addr) {
175 otherservers[i].state = SERV_UP;
176 timer_reset(otherservers[i].timer);
177 otherservers[i].timer = NULL;
178 otherservers[i].queue = NULL;
179 otherservers[i].dumping = 0;
183 /* free up the addresses */
186 if (me_server_idx == -1) {
187 syslog(LOG_WARNING, "I'm a renegade server!");
188 otherservers = (Server *) realloc(otherservers,
189 ++nservers * sizeof(Server));
191 syslog(LOG_CRIT, "renegade realloc");
194 setup_server(&otherservers[nservers - 1], &my_addr);
196 otherservers[nservers - 1].state = SERV_UP;
198 /* I don't send hello's to myself--cancel the timer */
199 timer_reset(otherservers[nservers - 1].timer);
200 otherservers[nservers - 1].timer = NULL;
202 /* cancel and reschedule all the timers--pointers need
204 /* don't reschedule limbo's timer, so start i=1 */
205 for (i = 1; i < nservers - 1; i++) {
206 timer_reset(otherservers[i].timer);
207 /* all the HELLO's are due now */
208 otherservers[i].timer = timer_set_rel(0L, server_timo,
211 me_server_idx = nservers - 1;
217 * server_reset: re-initializes otherservers array by refreshing from Hesiod
220 * If any server is no longer named in the new list, and that server is in
221 * state SERV_DEAD, it is dropped from the server list.
222 * All other currently-known servers are retained.
223 * Any additional servers not previously known are added to the table.
225 * WARNING: Don't call this routine if any of the ancestor procedures have a
226 * handle on a particular server other than by indexing on otherservers[].
232 struct in_addr *server_addrs;
233 struct in_addr *serv_addr;
236 int *ok_list_new, *ok_list_old;
241 syslog(LOG_INFO, "server_reset while alone, punt");
246 /* Find out what servers are supposed to be known. */
247 server_addrs = get_server_addrs(&num_servers);
249 syslog(LOG_ERR, "server_reset no servers. nothing done.");
252 ok_list_new = (int *) malloc(num_servers * sizeof(int));
254 syslog(LOG_ERR, "server_reset no mem new");
257 ok_list_old = (int *) malloc(nservers * sizeof(int));
259 syslog(LOG_ERR, "server_reset no mem old");
264 memset(ok_list_old, 0, nservers * sizeof(int));
265 memset(ok_list_new, 0, num_servers * sizeof(int));
267 /* reset timers--pointers will move */
268 for (j = 1; j < nservers; j++) { /* skip limbo */
269 if (j == me_server_idx)
271 timer_reset(otherservers[j].timer);
272 otherservers[j].timer = NULL;
275 /* check off entries on new list which are on old list.
276 check off entries on old list which are on new list. */
278 /* count limbo as "OK" */
280 ok_list_old[0] = 1; /* limbo is OK */
282 for (serv_addr = server_addrs, i = 0; i < num_servers; serv_addr++, i++) {
283 for (j = 1; j < nservers; j++) { /* j = 1 since we skip limbo */
284 if (otherservers[j].addr.sin_addr.s_addr == serv_addr->s_addr) {
285 /* if server is on both lists, mark */
289 break; /* for j loop */
294 /* remove any dead servers on old list not on new list. */
295 if (num_ok < nservers) {
298 new_num = 1; /* limbo */
299 /* count number of servers to keep */
300 for (j = 1; j < nservers; j++) {
301 /* since we are never SERV_DEAD, the following
302 test prevents removing ourself from the list */
303 if (ok_list_old[j] || (otherservers[j].state != SERV_DEAD)) {
304 syslog(LOG_INFO, "keeping server %s",
305 otherservers[j].addr_str);
309 if (new_num < nservers) {
310 servers = (Server *) malloc(new_num * sizeof(Server));
312 syslog(LOG_CRIT, "server_reset server malloc");
316 servers[0] = otherservers[0]; /* copy limbo */
318 srv = (int *) malloc(nservers * sizeof(int));
319 memset(srv, 0, nservers * sizeof(int));
321 /* copy the kept servers */
322 for (j = 1; j < nservers; j++) { /* skip limbo */
323 if (ok_list_old[j] ||
324 otherservers[j].state != SERV_DEAD) {
325 servers[i] = otherservers[j];
329 syslog(LOG_INFO, "flushing server %s",
330 otherservers[j].addr_str);
331 server_flush(&otherservers[j]);
336 srv_nack_renumber(srv);
340 otherservers = servers;
345 /* add any new servers on new list not on old list. */
347 for (i = 0; i < num_servers; i++) {
352 /* new_num is number of extras. */
354 otherservers = (Server *) realloc(otherservers, nservers * sizeof(Server));
356 syslog(LOG_CRIT, "server_reset realloc");
361 for (j = 1; j < nservers - new_num; j++) {
362 if (otherservers[j].addr.sin_addr.s_addr == my_addr.s_addr) {
367 if (!me_server_idx) {
368 syslog(LOG_CRIT, "can't find myself");
372 /* fill in otherservers with the new servers */
373 for (i = 0; i < num_servers; i++) {
374 if (!ok_list_new[i]) {
375 setup_server(&otherservers[nservers - (new_num--)],
377 syslog(LOG_INFO, "adding server %s", inet_ntoa(server_addrs[i]));
382 /* reset timers, to go off now.
383 We can't get a time-left indication (bleagh!)
384 so we expire them all now. This will generally
385 be non-destructive. We assume that when this code is
386 entered via a SIGHUP trigger that a system wizard
387 is watching the goings-on to make sure things straighten
390 for (i = 1; i < nservers; i++) { /* skip limbo */
391 if (i != me_server_idx && !otherservers[i].timer) {
392 otherservers[i].timer =
393 timer_set_rel(0L, server_timo, &otherservers[i]);
401 /* note: these must match the order given in zserver.h */
418 * A server timout has expired. If enough hello's have been unanswered,
419 * change state and act accordingly. Send a "hello" and reset the timer,
420 * incrementing the number of hello's sent.
422 * See the FSM in the Zephyr document for a better picture of what's
427 server_timo(void *arg)
429 Server *which = (Server *) arg;
432 /* change state and reset if appropriate */
433 switch(which->state) {
434 case SERV_DEAD: /* leave him dead */
438 case SERV_UP: /* he's now tardy */
439 which->state = SERV_TARDY;
440 which->num_hello_sent = 0;
441 which->timeout = timo_tardy;
446 if (which->num_hello_sent >= ((which->state == SERV_TARDY) ?
449 /* he hasn't answered, assume DEAD */
450 which->state = SERV_DEAD;
451 which->num_hello_sent = 0;
452 which->timeout = timo_dead;
453 srv_nack_release(which);
458 syslog(LOG_ERR,"Bad server state, server 0x%x\n", (int)which);
461 /* now he's either TARDY, STARTING, or DEAD
462 We send a "hello," which increments the counter */
463 server_hello(which, auth);
464 /* reschedule the timer */
465 which->timer = timer_set_rel(which->timeout, server_timo, which);
469 * Dispatch a notice from some other server
474 server_dispatch(ZNotice_t *notice,
476 struct sockaddr_in *who)
479 struct sockaddr_in newwho;
481 String *notice_class;
484 if (notice->z_kind == SERVACK) {
485 srv_nack_cancel(notice, who);
489 /* set up a who for the real origin */
490 memset(&newwho, 0, sizeof(newwho));
491 newwho.sin_family = AF_INET;
492 newwho.sin_addr.s_addr = notice->z_sender_addr.s_addr;
493 newwho.sin_port = notice->z_port;
495 server = server_which_server(who);
497 /* we can dispatch to routines safely here, since they will
498 return ZSRV_REQUEUE if appropriate. We bounce this back
499 to the caller, and the caller will re-queue the message
500 for us to process later. */
502 notice_class = make_string(notice->z_class, 1);
504 if (realm_which_realm(&newwho))
505 status = realm_dispatch(notice, auth, &newwho, server);
506 else if (class_is_admin(notice_class)) {
507 /* admins don't get acked, else we get a packet loop */
508 /* will return requeue if bdump request and dumping */
510 return admin_dispatch(notice, auth, who, server);
511 } else if (class_is_control(notice_class)) {
512 status = control_dispatch(notice, auth, &newwho, server);
514 } else if (class_is_ulogin(notice_class)) {
515 status = ulogin_dispatch(notice, auth, &newwho, server);
517 } else if (class_is_ulocate(notice_class)) {
518 status = ulocate_dispatch(notice, auth, &newwho, server);
521 /* shouldn't come from another server */
522 syslog(LOG_WARNING, "srv_disp: pkt cls %s", notice->z_class);
523 status = ZERR_NONE; /* XXX */
525 if (status != ZSRV_REQUEUE)
526 ack(notice, who); /* acknowledge it if processed */
527 free_string(notice_class);
533 * Register a new server (one not in our list). This MUST be authenticated.
538 server_register(notice, auth, who)
541 struct sockaddr_in *who;
547 if (who->sin_port != srv_addr.sin_port) {
550 /* Not yet... talk to ken about authenticators */
553 zdbug((LOG_DEBUG, "srv_unauth"));
557 /* OK, go ahead and set him up. */
558 temp = (Server *) malloc((nservers + 1) * sizeof(Server));
560 syslog(LOG_CRIT, "srv_reg malloc");
564 memcpy(temp, otherservers, nservers * sizeof(Server));
567 /* don't reschedule limbo's timer, so start i=1 */
568 for (i = 1; i < nservers; i++) {
569 if (i == me_server_idx) /* don't reset myself */
571 /* reschedule the timers--we moved otherservers */
572 timerval = timer_when(otherservers[i].timer);
573 timer_reset(otherservers[i].timer);
574 otherservers[i].timer = timer_set_abs(timerval, server_timo,
577 setup_server(&otherservers[nservers], &who->sin_addr);
578 otherservers[nservers].state = SERV_STARTING;
579 otherservers[nservers].timeout = timo_tardy;
580 otherservers[nservers].update_queue = NULL;
581 otherservers[nservers].dumping = 0;
590 * Tell the other servers that this client died.
594 server_kill_clt(Client *client)
597 char buf[512], *lyst[2];
599 ZNotice_t *pnotice; /* speed hack */
604 lyst[0] = inet_ntoa(client->addr.sin_addr),
605 sprintf(buf, "%d", ntohs(client->addr.sin_port));
610 memset (¬ice, 0, sizeof(notice));
612 pnotice->z_kind = ACKED;
614 pnotice->z_port = srv_addr.sin_port;
615 pnotice->z_class = ZEPHYR_ADMIN_CLASS;
616 pnotice->z_class_inst = "";
617 pnotice->z_opcode = ADMIN_KILL_CLT;
618 pnotice->z_sender = myname; /* myname is the hostname */
619 pnotice->z_recipient = "";
620 pnotice->z_default_format = "";
621 pnotice->z_num_other_fields = 0;
626 /* don't tell limbo to flush, start at 1*/
627 for (i = 1; i < nservers; i++) {
628 if (i == me_server_idx) /* don't xmit to myself */
630 if (otherservers[i].state == SERV_DEAD)
633 retval = ZFormatNoticeList(pnotice, lyst, 2, &pack, &packlen,
634 auth ? ZAUTH : ZNOAUTH);
635 if (retval != ZERR_NONE) {
636 syslog(LOG_WARNING, "kill_clt format: %s", error_message(retval));
639 server_forw_reliable(&otherservers[i], pack, packlen, pnotice);
644 * A client has died. remove it
648 kill_clt(ZNotice_t *notice,
651 struct sockaddr_in who;
654 if (extract_addr(notice, &who) != ZERR_NONE)
655 return ZERR_NONE; /* XXX */
656 client = client_find(&who.sin_addr, notice->z_port);
658 syslog(LOG_NOTICE, "kill_clt: no such client (%s/%d) from %s",
659 inet_ntoa(who.sin_addr), ntohs(who.sin_port),
661 return ZERR_NONE; /* XXX */
665 syslog(LOG_DEBUG, "kill_clt clt_dereg %s/%d from %s",
666 inet_ntoa(who.sin_addr), ntohs(who.sin_port), server->addr_str);
669 /* remove the locations, too */
670 client_deregister(client, 1);
675 * extract a sockaddr_in from a message body
679 extract_addr(ZNotice_t *notice,
680 struct sockaddr_in *who)
682 char *cp = notice->z_message;
684 if (!notice->z_message_len) {
685 syslog(LOG_WARNING, "bad addr pkt");
688 who->sin_addr.s_addr = inet_addr(notice->z_message);
690 cp += strlen(cp) + 1;
691 if (cp >= notice->z_message + notice->z_message_len) {
692 syslog(LOG_WARNING, "short addr pkt");
695 who->sin_port = notice->z_port = htons((u_short) atoi(cp));
696 who->sin_family = AF_INET;
701 * Flush all data associated with the server which
705 server_flush(Server *which)
707 srv_nack_release(which);
711 * send a hello to which, updating the count of hello's sent
712 * Authenticate if auth is set.
716 server_hello(Server *which,
719 send_msg(&which->addr, ADMIN_HELLO, auth);
720 which->num_hello_sent++;
724 * Handle an ADMIN message from a server
729 admin_dispatch(ZNotice_t *notice,
731 struct sockaddr_in *who,
734 char *opcode = notice->z_opcode;
735 Code_t status = ZERR_NONE;
737 if (strcmp(opcode, ADMIN_HELLO) == 0) {
738 hello_respond(who, ADJUST, auth);
739 } else if (strcmp(opcode, ADMIN_IMHERE) == 0) {
741 } else if (strcmp(opcode, ADMIN_SHUTDOWN) == 0) {
743 srv_nack_release(server);
744 server->state = SERV_DEAD;
745 server->timeout = timo_dead;
746 /* don't worry about the timer, it will
747 be set appropriately on the next send */
749 } else if (strcmp(opcode, ADMIN_BDUMP) == 0) {
750 /* Ignore a brain dump request if this is a brain dump packet
751 * or a packet being processed concurrently during a brain
753 if (bdumping || bdump_concurrent)
755 bdump_get(notice, auth, who, server);
756 } else if (strcmp(opcode, ADMIN_KILL_CLT) == 0) {
757 status = kill_clt(notice, server);
758 if (status == ZERR_NONE)
761 syslog(LOG_WARNING, "ADMIN unknown opcode %s",opcode);
768 * Handle an ADMIN message from some random client.
769 * For now, assume it's a registration-type message from some other
770 * previously unknown server
775 server_adispatch(ZNotice_t *notice,
777 struct sockaddr_in *who,
781 /* this had better be a HELLO message--start of acquisition
782 protocol, OR a status req packet */
784 if (strcmp(notice->z_opcode, ADMIN_STATUS) == 0) {
791 syslog(LOG_INFO, "disp: new server?");
792 if (server_register(notice, auth, who) != ZERR_NONE) {
793 syslog(LOG_INFO, "new server failed");
795 syslog(LOG_INFO, "new server %s, %d", inet_ntoa(who->sin_addr),
796 ntohs(who->sin_port));
797 hello_respond(who, DONT_ADJUST, auth);
800 syslog(LOG_INFO, "srv_adisp: server attempt from %s",
801 inet_ntoa(who->sin_addr));
808 send_stats(struct sockaddr_in *who)
814 char *vers, *pkts, *upt;
818 #define NUM_FIXED 3 /* 3 fixed fields, plus server info */
819 /* well, not really...but for
820 backward compatibility, we gotta
822 vers = get_version();
824 sprintf(buf, "%lu pkts", npackets);
826 sprintf(buf, "%ld seconds operational",NOW - uptime);
830 if (old_compat_count_uloc)
832 if (old_compat_count_ulocate)
834 if (old_compat_count_subscr)
836 #endif /* OLD_COMPAT */
838 if (new_compat_count_uloc)
840 if (new_compat_count_subscr)
842 #endif /* NEW_COMPAT */
843 extrafields += nrealms;
844 responses = (char **) malloc((NUM_FIXED + nservers + extrafields) *
850 num_resp = NUM_FIXED;
851 /* start at 1 and ignore limbo */
852 for (i = 1; i < nservers ; i++) {
853 sprintf(buf, "%s/%s%s", otherservers[i].addr_str,
854 srv_states[(int) otherservers[i].state],
855 otherservers[i].dumping ? " (DUMPING)" : "");
856 responses[num_resp++] = strsave(buf);
859 if (old_compat_count_uloc) {
860 sprintf(buf, "%d old old location requests", old_compat_count_uloc);
861 responses[num_resp++] = strsave(buf);
863 if (old_compat_count_ulocate) {
864 sprintf(buf, "%d old old loc lookup requests",
865 old_compat_count_ulocate);
866 responses[num_resp++] = strsave(buf);
868 if (old_compat_count_subscr) {
869 sprintf(buf, "%d old old subscr requests", old_compat_count_subscr);
870 responses[num_resp++] = strsave(buf);
872 #endif /* OLD_COMPAT */
874 if (new_compat_count_uloc) {
875 sprintf(buf, "%d new old location requests", new_compat_count_uloc);
876 responses[num_resp++] = strsave(buf);
878 if (new_compat_count_subscr) {
879 sprintf(buf, "%d new old subscr requests", new_compat_count_subscr);
880 responses[num_resp++] = strsave(buf);
882 #endif /* NEW_COMPAT */
883 for (realm = otherrealms, i = 0; i < nrealms ; i++, realm++) {
884 sprintf(buf, "%s(%s)/%s", realm->name,
885 inet_ntoa((realm->addrs[realm->idx]).sin_addr),
886 rlm_states[(int) realm->state]);
887 responses[num_resp++] = strsave(buf);
890 send_msg_list(who, ADMIN_STATUS, responses, num_resp, 0);
892 /* Start at one; don't try to free static version string */
893 for (i = 1; i < num_resp; i++)
899 * Get a list of server addresses.
901 * This list is retrieved from Hesiod.
903 * This list is read from a file.
905 * Return a pointer to an array of allocated storage. This storage is
906 * freed by the caller.
909 static struct in_addr *
910 get_server_addrs(int *number)
913 char **server_hosts = NULL;
914 char **server_hosts_free = NULL;
916 struct in_addr *addrs;
917 struct in_addr *addr;
920 server_hosts = get_server_list(list_file);
921 server_hosts_free = server_hosts;
924 server_hosts = hes_resolve("zephyr","sloc");
927 server_hosts = get_single_server();
928 server_hosts_free = server_hosts;
934 for (cpp = server_hosts; *cpp; cpp++)
937 addrs = (struct in_addr *) malloc(i * sizeof(struct in_addr));
939 /* Convert to in_addr's */
940 for (cpp = server_hosts, addr = addrs, i = 0; *cpp; cpp++) {
941 hp = gethostbyname(*cpp);
943 memcpy(addr, hp->h_addr, sizeof(struct in_addr));
946 syslog(LOG_WARNING, "hostname failed, %s", *cpp);
950 if (server_hosts_free)
951 free_server_list(server_hosts_free);
955 static int nhosts = 0;
958 * read "file" to get a list of names of hosts to peer with.
959 * The file should contain a list of host names, one per line.
963 get_server_list(char *file)
966 char buf[MAXHOSTNAMELEN];
971 fp = fopen(file, "r");
974 /* start with 16, realloc if necessary */
976 ret_list = (char **) malloc(nhosts * sizeof(char *));
980 while (fgets(buf, MAXHOSTNAMELEN, fp)) {
981 /* nuke the newline, being careful not to overrun
982 the buffer searching for it with strlen() */
983 buf[MAXHOSTNAMELEN - 1] = '\0';
984 newline = strchr(buf, '\n');
988 if (nused + 1 >= nhosts) {
989 /* get more pointer space if necessary */
990 /* +1 to leave room for null pointer */
991 ret_list = (char **) realloc(ret_list, nhosts * 2);
994 ret_list[nused++] = strsave(buf);
1001 ret_list[nused] = NULL;
1006 get_single_server(void)
1008 char buf[MAXHOSTNAMELEN];
1012 ret_list = (char **) malloc(nhosts * sizeof(char *));
1015 if (gethostname(buf, sizeof(buf)) < 0) {
1019 ret_list[nused++] = strsave(buf);
1020 ret_list[nused] = NULL;
1025 * free storage allocated by get_server_list
1028 free_server_list(char **list)
1030 char **orig_list = list;
1032 if (!nhosts) /* nothing allocated */
1034 for (; *list; list++)
1041 * initialize the server structure for address addr, and set a timer
1042 * to go off immediately to send hello's to other servers.
1046 setup_server(Server *server,
1047 struct in_addr *addr)
1049 server->state = SERV_DEAD;
1050 server->timeout = timo_dead;
1051 server->num_hello_sent = 0;
1052 server->addr.sin_family = AF_INET;
1053 /* he listens to the same port we do */
1054 server->addr.sin_port = srv_addr.sin_port;
1055 server->addr.sin_addr = *addr;
1056 strcpy(server->addr_str, inet_ntoa(*addr));
1057 server->timer = timer_set_rel(0L, server_timo, server);
1058 server->queue = NULL;
1059 server->dumping = 0;
1063 * Someone sent us a hello message, respond to them.
1067 hello_respond(struct sockaddr_in *who,
1073 send_msg(who, ADMIN_IMHERE, auth);
1077 /* If we think he's down, schedule an immediate HELLO. */
1079 which = server_which_server(who);
1083 switch (which->state) {
1085 /* he said hello, we thought he was dead.
1086 reschedule his hello for now. */
1087 timer_reset(which->timer);
1088 which->timer = timer_set_rel(0L, server_timo, which);
1099 * return the server descriptor for server at who
1103 server_which_server(struct sockaddr_in *who)
1108 if (who->sin_port != srv_addr.sin_port)
1111 /* don't check limbo */
1112 for (server = &otherservers[1], i = 1; i < nservers; i++, server++) {
1113 if (server->addr.sin_addr.s_addr == who->sin_addr.s_addr)
1120 * We received a response to a hello packet or an ack. Adjust server state
1124 srv_responded(struct sockaddr_in *who)
1126 Server *which = server_which_server(who);
1129 syslog(LOG_ERR, "hello input from non-server?!");
1133 switch (which->state) {
1135 /* he responded, we thought he was dead. mark as starting
1137 which->state = SERV_STARTING;
1138 which->timeout = timo_tardy;
1139 timer_reset(which->timer);
1140 which->timer = timer_set_rel(0L, server_timo, which);
1143 /* here we negotiate and set up a braindump */
1144 if (bdump_socket < 0)
1149 which->state = SERV_UP;
1153 /* reset the timer and counts */
1154 which->num_hello_sent = 0;
1155 which->timeout = timo_up;
1156 timer_reset(which->timer);
1157 which->timer = timer_set_rel(which->timeout, server_timo, which);
1163 * Send each of the other servers a shutdown message.
1167 server_shutdown(void)
1171 /* don't tell limbo to go away, start at 1*/
1172 for (i = 1; i < nservers; i++)
1173 send_msg(&otherservers[i].addr, ADMIN_SHUTDOWN, 1);
1177 * send a message to who with admin class and opcode and clinst as specified.
1178 * auth is set if we want to send authenticated
1182 send_msg(struct sockaddr_in *who,
1187 ZNotice_t *pnotice; /* speed hack */
1194 memset (¬ice, 0, sizeof(notice));
1196 pnotice->z_kind = ACKED;
1198 pnotice->z_port = srv_addr.sin_port;
1199 pnotice->z_class = ZEPHYR_ADMIN_CLASS;
1200 pnotice->z_class_inst = "";
1201 pnotice->z_opcode = opcode;
1202 pnotice->z_sender = myname; /* myname is the hostname */
1203 pnotice->z_recipient = "";
1204 pnotice->z_default_format = "";
1205 pnotice->z_message = NULL;
1206 pnotice->z_message_len = 0;
1207 pnotice->z_num_other_fields = 0;
1209 /* XXX for now, we don't do authentication */
1212 retval = ZFormatNotice(pnotice, &pack, &packlen, auth ? ZAUTH : ZNOAUTH);
1213 if (retval != ZERR_NONE) {
1214 syslog(LOG_WARNING, "snd_msg format: %s", error_message(retval));
1217 retval = ZSetDestAddr(who);
1218 if (retval != ZERR_NONE) {
1219 syslog(LOG_WARNING, "snd_msg set addr: %s", error_message(retval));
1223 /* don't wait for ack */
1224 retval = ZSendPacket(pack, packlen, 0);
1225 if (retval != ZERR_NONE)
1226 syslog(LOG_WARNING, "snd_msg xmit: %s", error_message(retval));
1231 * send a notice with a message to who with admin class and opcode and
1232 * message body as specified.
1233 * auth is set if we want to send authenticated
1234 * server_idx is -1 if we are sending to a client, or the server index
1235 * if we are sending to a server.
1239 send_msg_list(struct sockaddr_in *who,
1250 memset (¬ice, 0, sizeof(notice));
1252 notice.z_kind = UNSAFE;
1253 notice.z_port = srv_addr.sin_port;
1254 notice.z_class = ZEPHYR_ADMIN_CLASS;
1255 notice.z_class_inst = "";
1256 notice.z_opcode = opcode;
1257 notice.z_sender = myname; /* myname is the hostname */
1258 notice.z_recipient = "";
1259 notice.z_default_format = "";
1260 notice.z_message = NULL;
1261 notice.z_message_len = 0;
1262 notice.z_num_other_fields = 0;
1264 /* XXX for now, we don't do authentication */
1267 retval = ZFormatNoticeList(¬ice, lyst, num, &pack, &packlen,
1268 auth ? ZAUTH : ZNOAUTH);
1269 if (retval != ZERR_NONE) {
1270 syslog(LOG_WARNING, "snd_msg_lst format: %s", error_message(retval));
1273 retval = ZSetDestAddr(who);
1274 if (retval != ZERR_NONE) {
1275 syslog(LOG_WARNING, "snd_msg_lst set addr: %s", error_message(retval));
1279 xmit_frag(¬ice, pack, packlen, 0);
1284 * Forward the notice to the other servers
1288 server_forward(ZNotice_t *notice,
1290 struct sockaddr_in *who)
1297 /* don't send to limbo */
1298 for (i = 1; i < nservers; i++) {
1299 if (i == me_server_idx) /* don't xmit to myself */
1301 if (otherservers[i].state == SERV_DEAD &&
1302 otherservers[i].dumping == 0) {
1303 /* if we are dumping to him, we want to
1304 queue it, even if he's dead */
1308 pack = malloc(sizeof(ZPacket_t));
1310 syslog(LOG_CRIT, "srv_fwd malloc");
1313 retval = ZNewFormatSmallRawNotice(notice, pack, &packlen);
1314 if (retval != ZERR_NONE) {
1315 syslog(LOG_WARNING, "srv_fwd format: %s", error_message(retval));
1318 if (otherservers[i].dumping) {
1319 server_queue(&otherservers[i], packlen, pack, auth, who);
1322 server_forw_reliable(&otherservers[i], pack, packlen, notice);
1327 server_forw_reliable(Server *server,
1336 retval = ZSetDestAddr(&server->addr);
1337 if (retval != ZERR_NONE) {
1338 syslog(LOG_WARNING, "srv_fwd_rel set addr: %s", error_message(retval));
1342 retval = ZSendPacket(pack, packlen, 0);
1343 if (retval != ZERR_NONE) {
1344 syslog(LOG_WARNING, "srv_fwd xmit: %s", error_message(retval));
1348 /* now we've sent it, mark it as not ack'ed */
1350 nacked = (Unacked *) malloc(sizeof(Unacked));
1352 /* no space: just punt */
1353 syslog(LOG_ERR, "srv_forw_rel nack malloc");
1358 nacked->client = NULL;
1359 nacked->rexmits = 0;
1360 nacked->packet = pack;
1361 nacked->dest.srv_idx = server - otherservers;
1362 nacked->packsz = packlen;
1363 nacked->uid = notice->z_uid;
1364 nacked->timer = timer_set_rel(rexmit_times[0], srv_rexmit, nacked);
1365 hashval = SRV_NACKTAB_HASHVAL(nacked->dest.srv_idx, nacked->uid);
1366 Unacked_insert(&srv_nacktab[hashval], nacked);
1370 * send the queued message for the server.
1374 server_send_queue(Server *server)
1380 while (server->queue) {
1381 pending = server_dequeue(server);
1382 status = ZParseNotice(pending->packet, pending->len, ¬ice);
1383 if (status != ZERR_NONE) {
1384 syslog(LOG_ERR, "ssq bad notice parse (%s): %s",
1385 inet_ntoa(pending->who.sin_addr), error_message(status));
1387 server_forw_reliable(server, pending->packet, pending->len,
1390 /* ACK handling routines will free the packet */
1396 * a server has acknowledged a message we sent to him; remove it from
1397 * server unacked queue
1401 srv_nack_cancel(ZNotice_t *notice,
1402 struct sockaddr_in *who)
1404 Server *server = server_which_server(who);
1409 syslog(LOG_ERR, "non-server ack?");
1412 hashval = SRV_NACKTAB_HASHVAL(server - otherservers, notice->z_uid);
1413 for (nacked = srv_nacktab[hashval]; nacked; nacked = nacked->next) {
1414 if (nacked->dest.srv_idx == server - otherservers
1415 && ZCompareUID(&nacked->uid, ¬ice->z_uid)) {
1416 timer_reset(nacked->timer);
1417 free(nacked->packet);
1418 Unacked_delete(nacked);
1426 * retransmit a message to another server
1430 srv_rexmit(void *arg)
1432 Unacked *packet = (Unacked *) arg;
1434 /* retransmit the packet */
1436 if (otherservers[packet->dest.srv_idx].state == SERV_DEAD) {
1437 Unacked_delete(packet);
1438 free(packet->packet);
1439 srv_nack_release(&otherservers[packet->dest.srv_idx]);
1443 retval = ZSetDestAddr(&otherservers[packet->dest.srv_idx].addr);
1444 if (retval != ZERR_NONE) {
1445 syslog(LOG_WARNING, "srv_rexmit set addr: %s", error_message(retval));
1447 retval = ZSendPacket(packet->packet, packet->packsz, 0);
1448 if (retval != ZERR_NONE)
1449 syslog(LOG_WARNING, "srv_rexmit xmit: %s",
1450 error_message(retval));
1453 /* reset the timer */
1454 if (rexmit_times[packet->rexmits + 1] != -1)
1456 packet->timer = timer_set_rel(rexmit_times[packet->rexmits], srv_rexmit,
1461 * Clean up the not-yet-acked queue and release anything destined
1466 srv_nack_release(Server *server)
1469 Unacked *nacked, *next;
1471 for (i = 0; i < SRV_NACKTAB_HASHSIZE; i++) {
1472 for (nacked = srv_nacktab[i]; nacked; nacked = next) {
1473 next = nacked->next;
1474 if (nacked->dest.srv_idx == server - otherservers) {
1475 timer_reset(nacked->timer);
1476 Unacked_delete(nacked);
1477 free(nacked->packet);
1485 * Adjust indices of not-yet-acked packets sent to other servers to
1486 * continue to refer to the correct server.
1490 srv_nack_renumber (int *new_idx)
1492 /* XXX release any private queue for this server */
1496 /* search the not-yet-acked list for anything destined to 'from', and
1497 change the index to 'to'. */
1498 for (i = 0; i < SRV_NACKTAB_HASHSIZE; i++) {
1499 for (nacked = srv_nacktab[i]; nacked; nacked = nacked->next) {
1500 idx = new_idx[nacked->dest.srv_idx];
1502 syslog(LOG_ERR, "srv_nack_renumber error: [%d]=%d",
1503 nacked->dest.srv_idx, idx);
1506 nacked->dest.srv_idx = idx;
1512 * Queue this notice to be transmitted to the server when it is ready.
1515 server_queue(Server *server,
1519 struct sockaddr_in *who)
1523 pending = (Pending *) malloc(sizeof(Pending));
1525 syslog(LOG_CRIT, "update_queue malloc");
1528 pending->packet = pack;
1530 pending->auth = auth;
1531 pending->who = *who;
1532 pending->next = NULL;
1534 /* put it on the end of the list */
1536 server->queue_last->next = pending;
1538 server->queue = server->queue_last = pending;
1542 * Pull a notice off the hold queue.
1546 server_dequeue(Server *server)
1552 pending = server->queue;
1553 server->queue = pending->next;
1558 * free storage used by a pending queue entry.
1562 server_pending_free(Pending *pending)
1564 free(pending->packet);
1570 * Queue something to be handled later by this server.
1574 server_self_queue(ZNotice_t* notice,
1576 struct sockaddr_in * who)
1582 retval = ZFormatRawNotice(notice, &pack, &packlen);
1583 if (retval != ZERR_NONE) {
1584 syslog(LOG_CRIT, "srv_self_queue format: %s", error_message(retval));
1587 server_queue(me_server, packlen, pack, auth, who);
1591 * dump info about servers onto the fp.
1592 * assumed to be called with SIGFPE blocked
1593 * (true if called from signal handler)
1596 server_dump_servers(FILE *fp)
1600 for (i = 0; i < nservers ; i++) {
1601 fprintf(fp, "%d:%s/%s%s\n", i, otherservers[i].addr_str,
1602 srv_states[otherservers[i].state],
1603 otherservers[i].dumping ? " (DUMPING)" : "");