2 * Copyright (c) 1999 Adrian Sun (asun@zoology.washington.edu)
3 * Copyright (c) 1990,1993 Regents of The University of Michigan.
4 * All Rights Reserved. See COPYRIGHT.
6 * modified from main.c. this handles afp over tcp.
11 #endif /* HAVE_CONFIG_H */
20 #endif /* HAVE_UNISTD_H */
21 #include <sys/socket.h>
23 #ifdef HAVE_SYS_STAT_H
25 #endif /* HAVE_SYS_STAT_H */
26 #include <netinet/in.h>
27 #include <arpa/inet.h>
28 #include <atalk/logger.h>
31 #include <atalk/dsi.h>
32 #include <atalk/compat.h>
33 #include <atalk/util.h>
34 #include <atalk/locking.h>
45 #endif /* FORCE_UIDGID */
48 * We generally pass this from afp_over_dsi to all afp_* funcs, so it should already be
49 * available everywhere. Unfortunately some funcs (eg acltoownermode) need acces to it
50 * but are deeply nested in the function chain with the caller already without acces to it.
51 * Changing this would require adding a reference to the caller which itself might be
52 * called in many places (eg acltoownermode is called from accessmode).
53 * The only sane way out is providing a copy of it here:
55 AFPObj *AFPobj = NULL;
66 * - indexed just by taking DSIreqID mod REPLAYCACHE_SIZE
68 static rc_elem_t replaycache[REPLAYCACHE_SIZE];
70 static sigjmp_buf recon_jmp;
71 static int oldsock = -1;
72 static void afp_dsi_close(AFPObj *obj)
74 DSI *dsi = obj->handle;
79 /* we may have been called from a signal handler caught when afpd was running
80 * as uid 0, that's the wrong user for volume's prexec_close scripts if any,
81 * restore our login user
83 if (geteuid() != obj->uid) {
84 if (seteuid( obj->uid ) < 0) {
85 LOG(log_error, logtype_afpd, "can't seteuid(%u) back %s: uid: %u, euid: %u",
86 obj->uid, strerror(errno), getuid(), geteuid());
95 LOG(log_note, logtype_afpd, "AFP statistics: %.2f KB read, %.2f KB written",
96 dsi->read_count/1024.0, dsi->write_count/1024.0);
102 /* -------------------------------
104 * a little bit of code duplication.
106 static void afp_dsi_die(int sig)
108 DSI *dsi = (DSI *)AFPobj->handle;
109 static volatile int in_handler;
114 /* it's not atomic but we don't care because it's an exit function
115 * ie if a signal is received here, between the test and the affectation,
116 * it will not return.
120 if (dsi->flags & DSI_RECONINPROG) {
121 /* Primary reconnect succeeded, got SIGTERM from afpd parent */
122 dsi->flags &= ~DSI_RECONINPROG;
123 return; /* this returns to afp_disconnect */
126 dsi_attention(AFPobj->handle, AFPATTN_SHUTDOWN);
127 afp_dsi_close(AFPobj);
128 if (sig) /* if no signal, assume dieing because logins are disabled &
129 don't log it (maintenance mode)*/
130 LOG(log_info, logtype_afpd, "Connection terminated");
131 if (sig == SIGTERM || sig == SIGALRM) {
139 static void afp_dsi_transfer_session(int sig _U_)
143 DSI *dsi = (DSI *)AFPobj->handle;
145 LOG(log_note, logtype_afpd, "afp_dsi_transfer_session: got SIGURG, trying to receive session");
147 if (readt(AFPobj->ipc_fd, &dsiID, 2, 0, 2) != 2) {
148 LOG(log_error, logtype_afpd, "afp_dsi_transfer_session: couldn't receive DSI id, goodbye");
149 afp_dsi_close(AFPobj);
153 if ((socket = recv_fd(AFPobj->ipc_fd, 1)) == -1) {
154 LOG(log_error, logtype_afpd, "afp_dsi_transfer_session: couldn't receive session fd, goodbye");
155 afp_dsi_close(AFPobj);
159 LOG(log_note, logtype_afpd, "afp_dsi_transfer_session: received socket fd: %i", socket);
161 dsi->socket = socket;
162 dsi->flags |= DSI_RECONSOCKET;
163 dsi->flags &= ~DSI_DISCONNECTED;
165 dsi->header.dsi_requestID = dsiID;
166 dsi->header.dsi_command = DSIFUNC_CMD;
169 * The session transfer happens in the middle of FPDisconnect old session, thus we
170 * have to send the reply now.
172 if (!dsi_cmdreply(dsi, AFP_OK)) {
173 LOG(log_error, logtype_afpd, "dsi_cmdreply: %s", strerror(errno) );
174 afp_dsi_close(AFPobj);
178 LOG(log_note, logtype_afpd, "afp_dsi_transfer_session: succesfull primary reconnect");
180 * Now returning from this signal handler return to dsi_receive which should start
181 * reading/continuing from the connected socket that was passed via the parent from
182 * another session. The parent will terminate that session.
184 siglongjmp(recon_jmp, 1);
188 static void afp_dsi_sleep(void)
190 dsi_sleep(AFPobj->handle, 1);
193 /* ------------------- */
194 static void afp_dsi_timedown(int sig _U_)
198 DSI *dsi = (DSI *)AFPobj->handle;
199 dsi->flags |= DSI_DIE;
200 /* shutdown and don't reconnect. server going down in 5 minutes. */
201 setmessage("The server is going down for maintenance.");
202 if (dsi_attention(AFPobj->handle, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
203 AFPATTN_MESG | AFPATTN_TIME(5)) < 0) {
204 DSI *dsi = (DSI *)AFPobj->handle;
205 dsi->down_request = 1;
208 it.it_interval.tv_sec = 0;
209 it.it_interval.tv_usec = 0;
210 it.it_value.tv_sec = 300;
211 it.it_value.tv_usec = 0;
213 if ( setitimer( ITIMER_REAL, &it, NULL ) < 0 ) {
214 LOG(log_error, logtype_afpd, "afp_timedown: setitimer: %s", strerror(errno) );
215 afp_dsi_die(EXITERR_SYS);
217 memset(&sv, 0, sizeof(sv));
218 sv.sa_handler = afp_dsi_die;
219 sigemptyset( &sv.sa_mask );
220 sigaddset(&sv.sa_mask, SIGHUP);
221 sigaddset(&sv.sa_mask, SIGTERM);
222 sv.sa_flags = SA_RESTART;
223 if ( sigaction( SIGALRM, &sv, NULL ) < 0 ) {
224 LOG(log_error, logtype_afpd, "afp_timedown: sigaction: %s", strerror(errno) );
225 afp_dsi_die(EXITERR_SYS);
229 sv.sa_handler = SIG_IGN;
230 sigemptyset( &sv.sa_mask );
231 sv.sa_flags = SA_RESTART;
232 if ( sigaction( SIGUSR1, &sv, NULL ) < 0 ) {
233 LOG(log_error, logtype_afpd, "afp_timedown: sigaction SIGHUP: %s", strerror(errno) );
234 afp_dsi_die(EXITERR_SYS);
238 /* ---------------------------------
239 * SIGHUP reload configuration file
241 volatile int reload_request = 0;
243 static void afp_dsi_reload(int sig _U_)
248 /* ---------------------------------
249 * SIGINT: enable max_debug LOGging
251 static volatile sig_atomic_t debug_request = 0;
253 static void afp_dsi_debug(int sig _U_)
258 /* ---------------------- */
259 static void afp_dsi_getmesg (int sig _U_)
261 DSI *dsi = (DSI *)AFPobj->handle;
263 dsi->msg_request = 1;
264 if (dsi_attention(AFPobj->handle, AFPATTN_MESG | AFPATTN_TIME(5)) < 0)
265 dsi->msg_request = 2;
268 static void alarm_handler(int sig _U_)
271 DSI *dsi = (DSI *)AFPobj->handle;
273 /* we have to restart the timer because some libraries may use alarm() */
274 setitimer(ITIMER_REAL, &dsi->timer, NULL);
276 /* we got some traffic from the client since the previous timer tick. */
277 if ((dsi->flags & DSI_DATA)) {
278 dsi->flags &= ~DSI_DATA;
279 dsi->flags &= ~DSI_DISCONNECTED;
285 if (dsi->flags & DSI_SLEEPING) {
286 if (dsi->tickle < AFPobj->options.sleep) {
287 LOG(log_error, logtype_afpd, "afp_alarm: sleep time ended");
288 afp_dsi_die(EXITERR_CLNT);
293 if (dsi->flags & DSI_DISCONNECTED) {
294 if (dsi->tickle > AFPobj->options.disconnected) {
295 LOG(log_error, logtype_afpd, "afp_alarm: no reconnect within 10 minutes, goodbye");
296 afp_dsi_die(EXITERR_CLNT);
301 /* if we're in the midst of processing something, don't die. */
302 if ( !(dsi->flags & DSI_RUNNING) && (dsi->tickle > AFPobj->options.timeout)) {
303 LOG(log_error, logtype_afpd, "afp_alarm: child timed out, entering disconnected state");
304 dsi->flags |= DSI_DISCONNECTED;
308 if ((err = pollvoltime(AFPobj)) == 0)
309 err = dsi_tickle(AFPobj->handle);
311 LOG(log_error, logtype_afpd, "afp_alarm: connection problem, entering disconnected state");
312 dsi->flags |= DSI_DISCONNECTED;
317 if dsi->in_write is set attention, tickle (and close?) msg
318 aren't sent. We don't care about tickle
320 static void pending_request(DSI *dsi)
322 /* send pending attention */
324 /* read msg if any, it could be done in afp_getsrvrmesg */
325 if (dsi->msg_request) {
326 if (dsi->msg_request == 2) {
327 /* didn't send it in signal handler */
328 dsi_attention(AFPobj->handle, AFPATTN_MESG | AFPATTN_TIME(5));
330 dsi->msg_request = 0;
333 if (dsi->down_request) {
334 dsi->down_request = 0;
335 dsi_attention(AFPobj->handle, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
336 AFPATTN_MESG | AFPATTN_TIME(5));
340 /* -------------------------------------------
341 afp over dsi. this never returns.
343 void afp_over_dsi(AFPObj *obj)
345 DSI *dsi = (DSI *) obj->handle;
349 struct sigaction action;
352 obj->exit = afp_dsi_die;
353 obj->reply = (int (*)()) dsi_cmdreply;
354 obj->attention = (int (*)(void *, AFPUserBytes)) dsi_attention;
355 obj->sleep = afp_dsi_sleep;
358 memset(&action, 0, sizeof(action));
361 action.sa_handler = afp_dsi_reload;
362 sigemptyset( &action.sa_mask );
363 sigaddset(&action.sa_mask, SIGALRM);
364 sigaddset(&action.sa_mask, SIGTERM);
365 sigaddset(&action.sa_mask, SIGUSR1);
366 sigaddset(&action.sa_mask, SIGINT);
367 sigaddset(&action.sa_mask, SIGUSR2);
368 action.sa_flags = SA_RESTART;
369 if ( sigaction( SIGHUP, &action, NULL ) < 0 ) {
370 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
371 afp_dsi_die(EXITERR_SYS);
375 action.sa_handler = afp_dsi_transfer_session;
376 sigemptyset( &action.sa_mask );
377 sigaddset(&action.sa_mask, SIGALRM);
378 sigaddset(&action.sa_mask, SIGTERM);
379 sigaddset(&action.sa_mask, SIGUSR1);
380 sigaddset(&action.sa_mask, SIGINT);
381 sigaddset(&action.sa_mask, SIGUSR2);
382 action.sa_flags = SA_RESTART;
383 if ( sigaction( SIGURG, &action, NULL ) < 0 ) {
384 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
385 afp_dsi_die(EXITERR_SYS);
388 /* install SIGTERM */
389 action.sa_handler = afp_dsi_die;
390 sigemptyset( &action.sa_mask );
391 sigaddset(&action.sa_mask, SIGALRM);
392 sigaddset(&action.sa_mask, SIGHUP);
393 sigaddset(&action.sa_mask, SIGUSR1);
394 sigaddset(&action.sa_mask, SIGINT);
395 sigaddset(&action.sa_mask, SIGUSR2);
396 action.sa_flags = SA_RESTART;
397 if ( sigaction( SIGTERM, &action, NULL ) < 0 ) {
398 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
399 afp_dsi_die(EXITERR_SYS);
402 /* Added for server message support */
403 action.sa_handler = afp_dsi_getmesg;
404 sigemptyset( &action.sa_mask );
405 sigaddset(&action.sa_mask, SIGALRM);
406 sigaddset(&action.sa_mask, SIGTERM);
407 sigaddset(&action.sa_mask, SIGUSR1);
408 sigaddset(&action.sa_mask, SIGHUP);
409 sigaddset(&action.sa_mask, SIGINT);
410 action.sa_flags = SA_RESTART;
411 if ( sigaction( SIGUSR2, &action, NULL) < 0 ) {
412 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
413 afp_dsi_die(EXITERR_SYS);
416 /* SIGUSR1 - set down in 5 minutes */
417 action.sa_handler = afp_dsi_timedown;
418 sigemptyset( &action.sa_mask );
419 sigaddset(&action.sa_mask, SIGALRM);
420 sigaddset(&action.sa_mask, SIGHUP);
421 sigaddset(&action.sa_mask, SIGTERM);
422 sigaddset(&action.sa_mask, SIGINT);
423 sigaddset(&action.sa_mask, SIGUSR2);
424 action.sa_flags = SA_RESTART;
425 if ( sigaction( SIGUSR1, &action, NULL) < 0 ) {
426 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
427 afp_dsi_die(EXITERR_SYS);
430 /* SIGINT - enable max_debug LOGging to /tmp/afpd.PID.XXXXXX */
431 action.sa_handler = afp_dsi_debug;
432 sigfillset( &action.sa_mask );
433 action.sa_flags = SA_RESTART;
434 if ( sigaction( SIGINT, &action, NULL) < 0 ) {
435 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
436 afp_dsi_die(EXITERR_SYS);
441 action.sa_handler = alarm_handler;
442 sigemptyset(&action.sa_mask);
443 sigaddset(&action.sa_mask, SIGHUP);
444 sigaddset(&action.sa_mask, SIGTERM);
445 sigaddset(&action.sa_mask, SIGUSR1);
446 sigaddset(&action.sa_mask, SIGINT);
447 sigaddset(&action.sa_mask, SIGUSR2);
448 action.sa_flags = SA_RESTART;
449 if ((sigaction(SIGALRM, &action, NULL) < 0) ||
450 (setitimer(ITIMER_REAL, &dsi->timer, NULL) < 0)) {
451 afp_dsi_die(EXITERR_SYS);
453 #endif /* DEBUGGING */
455 if (dircache_init(obj->options.dircachesize) != 0)
456 afp_dsi_die(EXITERR_SYS);
458 /* get stuck here until the end */
460 if (sigsetjmp(recon_jmp, 1) != 0) {
461 LOG(log_note, logtype_afpd, "Resuming operation after succesfull primary reconnect");
462 dsi->flags &= ~(DSI_RUNNING | DSI_DATA);
463 dsi->eof = dsi->start = dsi->buffer;
467 cmd = dsi_receive(dsi);
469 if (dsi->flags & DSI_RECONSOCKET) {
470 /* we just got a reconnect so we immediately try again to receive on the new fd */
471 dsi->flags &= ~DSI_RECONSOCKET;
474 /* Some error on the client connection, enter disconnected state */
475 dsi->flags |= DSI_DISCONNECTED;
476 pause(); /* gets interrupted by SIGALARM or SIGURG tickle */
477 continue; /* continue receiving until disconnect timer expires
478 * or a primary reconnect succeeds */
481 /* Now, after successfully reading from the new socket after a reconnect *
482 * we can close the old socket without taking the risk of confusing the client */
489 dsi_sleep(dsi, 0); /* wake up */
491 if (reload_request) {
493 load_volumes(AFPobj);
498 /* The first SIGINT enables debugging, the next restores the config */
500 static int debugging = 0;
504 if (obj->options.logconfig)
505 setuplog(obj->options.logconfig);
507 setuplog("default log_note");
512 sprintf(logstr, "default log_maxdebug /tmp/afpd.%u.XXXXXX", getpid());
517 if (cmd == DSIFUNC_TICKLE) {
518 /* timer is not every 30 seconds anymore, so we don't get killed on the client side. */
519 if ((dsi->flags & DSI_DIE))
521 pending_request(dsi);
525 dsi->flags |= DSI_DATA;
529 LOG(log_note, logtype_afpd, "done");
536 if ( flushfork( writtenfork ) < 0 ) {
537 LOG(log_error, logtype_afpd, "main flushfork: %s", strerror(errno) );
543 function = (u_char) dsi->commands[0];
545 /* AFP replay cache */
546 rc_idx = REPLAYCACHE_SIZE % dsi->clientID;
547 LOG(log_debug, logtype_afpd, "DSI request ID: %u", dsi->clientID);
549 if (replaycache[rc_idx].DSIreqID == dsi->clientID
550 && replaycache[rc_idx].AFPcommand == function) {
551 LOG(log_debug, logtype_afpd, "AFP Replay Cache match: id: %u / cmd: %s",
552 dsi->clientID, AfpNum2name(function));
553 err = replaycache[rc_idx].result;
554 /* AFP replay cache end */
556 /* send off an afp command. in a couple cases, we take advantage
557 * of the fact that we're a stream-based protocol. */
558 if (afp_switch[function]) {
559 dsi->datalen = DSI_DATASIZ;
560 dsi->flags |= DSI_RUNNING;
562 LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
564 err = (*afp_switch[function])(obj,
565 (char *)&dsi->commands, dsi->cmdlen,
566 (char *)&dsi->data, &dsi->datalen);
568 LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
569 AfpNum2name(function), AfpErr2name(err));
571 dir_free_invalid_q();
574 /* bring everything back to old euid, egid */
576 restore_uidgid ( &obj->uidgid );
577 #endif /* FORCE_UIDGID */
578 dsi->flags &= ~DSI_RUNNING;
580 /* Add result to the AFP replay cache */
581 replaycache[rc_idx].DSIreqID = dsi->clientID;
582 replaycache[rc_idx].AFPcommand = function;
583 replaycache[rc_idx].result = err;
585 LOG(log_error, logtype_afpd, "bad function %X", function);
591 /* single shot toggle that gets set by dsi_readinit. */
592 if (dsi->flags & DSI_NOREPLY) {
593 dsi->flags &= ~DSI_NOREPLY;
597 if (!dsi_cmdreply(dsi, err)) {
598 LOG(log_error, logtype_afpd, "dsi_cmdreply(%d): %s", dsi->socket, strerror(errno) );
599 dsi->flags |= DSI_DISCONNECTED;
603 case DSIFUNC_WRITE: /* FPWrite and FPAddIcon */
604 function = (u_char) dsi->commands[0];
605 if ( afp_switch[ function ] != NULL ) {
606 dsi->datalen = DSI_DATASIZ;
607 dsi->flags |= DSI_RUNNING;
609 LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
611 err = (*afp_switch[function])(obj,
612 (char *)&dsi->commands, dsi->cmdlen,
613 (char *)&dsi->data, &dsi->datalen);
615 LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
616 AfpNum2name(function), AfpErr2name(err));
618 dsi->flags &= ~DSI_RUNNING;
620 /* bring everything back to old euid, egid */
622 restore_uidgid ( &obj->uidgid );
623 #endif /* FORCE_UIDGID */
625 LOG(log_error, logtype_afpd, "(write) bad function %x", function);
630 if (!dsi_wrtreply(dsi, err)) {
631 LOG(log_error, logtype_afpd, "dsi_wrtreply: %s", strerror(errno) );
632 dsi->flags |= DSI_DISCONNECTED;
636 case DSIFUNC_ATTN: /* attention replies */
639 /* error. this usually implies a mismatch of some kind
640 * between server and client. if things are correct,
641 * we need to flush the rest of the packet if necessary. */
643 LOG(log_info, logtype_afpd,"afp_dsi: spurious command %d", cmd);
644 dsi_writeinit(dsi, dsi->data, DSI_DATASIZ);
648 pending_request(dsi);
652 afp_dsi_die(EXITERR_CLNT);