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 <netinet/tcp.h>
28 #include <arpa/inet.h>
32 #include <atalk/logger.h>
33 #include <atalk/dsi.h>
34 #include <atalk/compat.h>
35 #include <atalk/util.h>
36 #include <atalk/uuid.h>
37 #include <atalk/paths.h>
38 #include <atalk/server_ipc.h>
39 #include <atalk/fce_api.h>
41 #include <atalk/globals.h>
50 #endif /* FORCE_UIDGID */
53 #define SOL_TCP IPPROTO_TCP
57 * We generally pass this from afp_over_dsi to all afp_* funcs, so it should already be
58 * available everywhere. Unfortunately some funcs (eg acltoownermode) need acces to it
59 * but are deeply nested in the function chain with the caller already without acces to it.
60 * Changing this would require adding a reference to the caller which itself might be
61 * called in many places (eg acltoownermode is called from accessmode).
62 * The only sane way out is providing a copy of it here:
64 AFPObj *AFPobj = NULL;
75 * - indexed just by taking DSIreqID mod REPLAYCACHE_SIZE
77 static rc_elem_t replaycache[REPLAYCACHE_SIZE];
79 static sigjmp_buf recon_jmp;
80 static void afp_dsi_close(AFPObj *obj)
82 DSI *dsi = obj->handle;
87 /* we may have been called from a signal handler caught when afpd was running
88 * as uid 0, that's the wrong user for volume's prexec_close scripts if any,
89 * restore our login user
91 if (geteuid() != obj->uid) {
92 if (seteuid( obj->uid ) < 0) {
93 LOG(log_error, logtype_afpd, "can't seteuid(%u) back %s: uid: %u, euid: %u",
94 obj->uid, strerror(errno), getuid(), geteuid());
103 LOG(log_note, logtype_afpd, "AFP statistics: %.2f KB read, %.2f KB written",
104 dsi->read_count/1024.0, dsi->write_count/1024.0);
110 /* -------------------------------
112 * a little bit of code duplication.
114 static void afp_dsi_die(int sig)
116 DSI *dsi = (DSI *)AFPobj->handle;
118 if (dsi->flags & DSI_RECONINPROG) {
119 /* Primary reconnect succeeded, got SIGTERM from afpd parent */
120 dsi->flags &= ~DSI_RECONINPROG;
121 return; /* this returns to afp_disconnect */
124 if (dsi->flags & DSI_DISCONNECTED) {
125 LOG(log_note, logtype_afpd, "Disconnected session terminating");
129 dsi_attention(AFPobj->handle, AFPATTN_SHUTDOWN);
130 afp_dsi_close(AFPobj);
131 if (sig) /* if no signal, assume dieing because logins are disabled &
132 don't log it (maintenance mode)*/
133 LOG(log_info, logtype_afpd, "Connection terminated");
134 if (sig == SIGTERM || sig == SIGALRM) {
142 /* SIGQUIT handler */
143 static void ipc_reconnect_handler(int sig _U_)
145 DSI *dsi = (DSI *)AFPobj->handle;
147 if (reconnect_ipc(AFPobj) != 0) {
148 LOG(log_error, logtype_afpd, "ipc_reconnect_handler: failed IPC reconnect");
149 afp_dsi_close(AFPobj);
153 if (ipc_child_write(AFPobj->ipc_fd, IPC_GETSESSION, AFPobj->sinfo.clientid_len, AFPobj->sinfo.clientid) != 0) {
154 LOG(log_error, logtype_afpd, "ipc_reconnect_handler: failed IPC ID resend");
155 afp_dsi_close(AFPobj);
158 LOG(log_note, logtype_afpd, "ipc_reconnect_handler: IPC reconnect done");
161 /* SIGURG handler (primary reconnect) */
162 static void afp_dsi_transfer_session(int sig _U_)
166 DSI *dsi = (DSI *)AFPobj->handle;
168 LOG(log_debug, logtype_afpd, "afp_dsi_transfer_session: got SIGURG, trying to receive session");
170 if (readt(AFPobj->ipc_fd, &dsiID, 2, 0, 2) != 2) {
171 LOG(log_error, logtype_afpd, "afp_dsi_transfer_session: couldn't receive DSI id, goodbye");
172 afp_dsi_close(AFPobj);
176 if ((socket = recv_fd(AFPobj->ipc_fd, 1)) == -1) {
177 LOG(log_error, logtype_afpd, "afp_dsi_transfer_session: couldn't receive session fd, goodbye");
178 afp_dsi_close(AFPobj);
182 LOG(log_debug, logtype_afpd, "afp_dsi_transfer_session: received socket fd: %i", socket);
184 dsi->proto_close(dsi);
185 dsi->socket = socket;
186 dsi->flags = DSI_RECONSOCKET;
188 dsi->eof = dsi->start = dsi->buffer;
190 dsi->header.dsi_requestID = dsiID;
191 dsi->header.dsi_command = DSIFUNC_CMD;
194 * The session transfer happens in the middle of FPDisconnect old session, thus we
195 * have to send the reply now.
197 if (!dsi_cmdreply(dsi, AFP_OK)) {
198 LOG(log_error, logtype_afpd, "dsi_cmdreply: %s", strerror(errno) );
199 afp_dsi_close(AFPobj);
203 LOG(log_note, logtype_afpd, "afp_dsi_transfer_session: succesfull primary reconnect");
205 * Now returning from this signal handler return to dsi_receive which should start
206 * reading/continuing from the connected socket that was passed via the parent from
207 * another session. The parent will terminate that session.
209 siglongjmp(recon_jmp, 1);
212 /* ------------------- */
213 static void afp_dsi_timedown(int sig _U_)
217 DSI *dsi = (DSI *)AFPobj->handle;
218 dsi->flags |= DSI_DIE;
219 /* shutdown and don't reconnect. server going down in 5 minutes. */
220 setmessage("The server is going down for maintenance.");
221 if (dsi_attention(AFPobj->handle, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
222 AFPATTN_MESG | AFPATTN_TIME(5)) < 0) {
223 DSI *dsi = (DSI *)AFPobj->handle;
224 dsi->down_request = 1;
227 it.it_interval.tv_sec = 0;
228 it.it_interval.tv_usec = 0;
229 it.it_value.tv_sec = 300;
230 it.it_value.tv_usec = 0;
232 if ( setitimer( ITIMER_REAL, &it, NULL ) < 0 ) {
233 LOG(log_error, logtype_afpd, "afp_timedown: setitimer: %s", strerror(errno) );
234 afp_dsi_die(EXITERR_SYS);
236 memset(&sv, 0, sizeof(sv));
237 sv.sa_handler = afp_dsi_die;
238 sigemptyset( &sv.sa_mask );
239 sigaddset(&sv.sa_mask, SIGHUP);
240 sigaddset(&sv.sa_mask, SIGTERM);
241 sv.sa_flags = SA_RESTART;
242 if ( sigaction( SIGALRM, &sv, NULL ) < 0 ) {
243 LOG(log_error, logtype_afpd, "afp_timedown: sigaction: %s", strerror(errno) );
244 afp_dsi_die(EXITERR_SYS);
248 sv.sa_handler = SIG_IGN;
249 sigemptyset( &sv.sa_mask );
250 sv.sa_flags = SA_RESTART;
251 if ( sigaction( SIGUSR1, &sv, NULL ) < 0 ) {
252 LOG(log_error, logtype_afpd, "afp_timedown: sigaction SIGHUP: %s", strerror(errno) );
253 afp_dsi_die(EXITERR_SYS);
257 /* ---------------------------------
258 * SIGHUP reload configuration file
260 volatile int reload_request = 0;
262 static void afp_dsi_reload(int sig _U_)
267 /* ---------------------------------
268 * SIGINT: enable max_debug LOGging
270 static volatile sig_atomic_t debug_request = 0;
272 static void afp_dsi_debug(int sig _U_)
277 /* ---------------------- */
278 static void afp_dsi_getmesg (int sig _U_)
280 DSI *dsi = (DSI *)AFPobj->handle;
282 dsi->msg_request = 1;
283 if (dsi_attention(AFPobj->handle, AFPATTN_MESG | AFPATTN_TIME(5)) < 0)
284 dsi->msg_request = 2;
287 static void alarm_handler(int sig _U_)
290 DSI *dsi = (DSI *)AFPobj->handle;
292 /* we have to restart the timer because some libraries may use alarm() */
293 setitimer(ITIMER_REAL, &dsi->timer, NULL);
295 /* we got some traffic from the client since the previous timer tick. */
296 if ((dsi->flags & DSI_DATA)) {
297 dsi->flags &= ~DSI_DATA;
302 LOG(log_maxdebug, logtype_afpd, "alarm: tickles: %u, flags: %s|%s|%s|%s|%s|%s|%s|%s|%s",
304 (dsi->flags & DSI_DATA) ? "DSI_DATA" : "-",
305 (dsi->flags & DSI_RUNNING) ? "DSI_RUNNING" : "-",
306 (dsi->flags & DSI_SLEEPING) ? "DSI_SLEEPING" : "-",
307 (dsi->flags & DSI_EXTSLEEP) ? "DSI_EXTSLEEP" : "-",
308 (dsi->flags & DSI_DISCONNECTED) ? "DSI_DISCONNECTED" : "-",
309 (dsi->flags & DSI_DIE) ? "DSI_DIE" : "-",
310 (dsi->flags & DSI_NOREPLY) ? "DSI_NOREPLY" : "-",
311 (dsi->flags & DSI_RECONSOCKET) ? "DSI_RECONSOCKET" : "-",
312 (dsi->flags & DSI_RECONINPROG) ? "DSI_RECONINPROG" : "-");
314 if (dsi->flags & DSI_SLEEPING) {
315 if (dsi->tickle > AFPobj->options.sleep) {
316 LOG(log_note, logtype_afpd, "afp_alarm: sleep time ended");
317 afp_dsi_die(EXITERR_CLNT);
322 if (dsi->flags & DSI_DISCONNECTED) {
323 if (geteuid() == 0) {
324 LOG(log_note, logtype_afpd, "afp_alarm: unauthenticated user, connection problem");
325 afp_dsi_die(EXITERR_CLNT);
327 if (dsi->tickle > AFPobj->options.disconnected) {
328 LOG(log_error, logtype_afpd, "afp_alarm: reconnect timer expired, goodbye");
329 afp_dsi_die(EXITERR_CLNT);
334 /* if we're in the midst of processing something, don't die. */
335 if (dsi->tickle >= AFPobj->options.timeout) {
336 LOG(log_error, logtype_afpd, "afp_alarm: child timed out, entering disconnected state");
337 if (dsi_disconnect(dsi) != 0)
338 afp_dsi_die(EXITERR_CLNT);
342 if ((err = pollvoltime(AFPobj)) == 0)
343 LOG(log_debug, logtype_afpd, "afp_alarm: sending DSI tickle");
344 err = dsi_tickle(AFPobj->handle);
346 if (geteuid() == 0) {
347 LOG(log_note, logtype_afpd, "afp_alarm: unauthenticated user, connection problem");
348 afp_dsi_die(EXITERR_CLNT);
350 LOG(log_error, logtype_afpd, "afp_alarm: connection problem, entering disconnected state");
351 if (dsi_disconnect(dsi) != 0)
352 afp_dsi_die(EXITERR_CLNT);
357 if dsi->in_write is set attention, tickle (and close?) msg
358 aren't sent. We don't care about tickle
360 static void pending_request(DSI *dsi)
362 /* send pending attention */
364 /* read msg if any, it could be done in afp_getsrvrmesg */
365 if (dsi->msg_request) {
366 if (dsi->msg_request == 2) {
367 /* didn't send it in signal handler */
368 dsi_attention(AFPobj->handle, AFPATTN_MESG | AFPATTN_TIME(5));
370 dsi->msg_request = 0;
373 if (dsi->down_request) {
374 dsi->down_request = 0;
375 dsi_attention(AFPobj->handle, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
376 AFPATTN_MESG | AFPATTN_TIME(5));
380 /* -------------------------------------------
381 afp over dsi. this never returns.
383 void afp_over_dsi(AFPObj *obj)
385 DSI *dsi = (DSI *) obj->handle;
389 struct sigaction action;
392 obj->exit = afp_dsi_die;
393 obj->reply = (int (*)()) dsi_cmdreply;
394 obj->attention = (int (*)(void *, AFPUserBytes)) dsi_attention;
397 memset(&action, 0, sizeof(action));
398 sigfillset(&action.sa_mask);
399 action.sa_flags = SA_RESTART;
402 action.sa_handler = afp_dsi_reload;
403 if ( sigaction( SIGHUP, &action, NULL ) < 0 ) {
404 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
405 afp_dsi_die(EXITERR_SYS);
409 action.sa_handler = afp_dsi_transfer_session;
410 if ( sigaction( SIGURG, &action, NULL ) < 0 ) {
411 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
412 afp_dsi_die(EXITERR_SYS);
415 /* install SIGTERM */
416 action.sa_handler = afp_dsi_die;
417 if ( sigaction( SIGTERM, &action, NULL ) < 0 ) {
418 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
419 afp_dsi_die(EXITERR_SYS);
422 /* install SIGQUIT */
423 action.sa_handler = ipc_reconnect_handler;
424 if ( sigaction(SIGQUIT, &action, NULL ) < 0 ) {
425 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
426 afp_dsi_die(EXITERR_SYS);
429 /* SIGUSR2 - server message support */
430 action.sa_handler = afp_dsi_getmesg;
431 if ( sigaction( SIGUSR2, &action, NULL) < 0 ) {
432 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
433 afp_dsi_die(EXITERR_SYS);
436 /* SIGUSR1 - set down in 5 minutes */
437 action.sa_handler = afp_dsi_timedown;
438 action.sa_flags = SA_RESTART;
439 if ( sigaction( SIGUSR1, &action, NULL) < 0 ) {
440 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
441 afp_dsi_die(EXITERR_SYS);
444 /* SIGINT - enable max_debug LOGging to /tmp/afpd.PID.XXXXXX */
445 action.sa_handler = afp_dsi_debug;
446 if ( sigaction( SIGINT, &action, NULL) < 0 ) {
447 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
448 afp_dsi_die(EXITERR_SYS);
452 /* SIGALRM - tickle handler */
453 action.sa_handler = alarm_handler;
454 if ((sigaction(SIGALRM, &action, NULL) < 0) ||
455 (setitimer(ITIMER_REAL, &dsi->timer, NULL) < 0)) {
456 afp_dsi_die(EXITERR_SYS);
458 #endif /* DEBUGGING */
460 if (dircache_init(obj->options.dircachesize) != 0)
461 afp_dsi_die(EXITERR_SYS);
463 /* set TCP snd/rcv buf */
464 if (obj->options.tcp_rcvbuf) {
465 if (setsockopt(dsi->socket,
468 &obj->options.tcp_rcvbuf,
469 sizeof(obj->options.tcp_rcvbuf)) != 0) {
470 LOG(log_error, logtype_dsi, "afp_over_dsi: setsockopt(SO_RCVBUF): %s", strerror(errno));
473 if (obj->options.tcp_sndbuf) {
474 if (setsockopt(dsi->socket,
477 &obj->options.tcp_sndbuf,
478 sizeof(obj->options.tcp_sndbuf)) != 0) {
479 LOG(log_error, logtype_dsi, "afp_over_dsi: setsockopt(SO_SNDBUF): %s", strerror(errno));
483 /* set TCP_NODELAY */
485 setsockopt(dsi->socket, SOL_TCP, TCP_NODELAY, &flag, sizeof(flag));
487 /* get stuck here until the end */
489 if (sigsetjmp(recon_jmp, 1) != 0)
490 /* returning from SIGALARM handler for a primary reconnect */
493 /* Blocking read on the network socket */
494 cmd = dsi_stream_receive(dsi);
497 /* cmd == 0 is the error condition */
498 if (dsi->flags & DSI_RECONSOCKET) {
499 /* we just got a reconnect so we immediately try again to receive on the new fd */
500 dsi->flags &= ~DSI_RECONSOCKET;
504 /* the client sometimes logs out (afp_logout) but doesn't close the DSI session */
505 if (dsi->flags & DSI_AFP_LOGGED_OUT) {
506 LOG(log_note, logtype_afpd, "afp_over_dsi: client logged out, terminating DSI session");
512 /* got ECONNRESET in read from client => exit*/
513 if (dsi->flags & DSI_GOT_ECONNRESET) {
514 LOG(log_note, logtype_afpd, "afp_over_dsi: client connection reset");
520 if (dsi->flags & DSI_RECONINPROG) {
521 LOG(log_note, logtype_afpd, "afp_over_dsi: failed reconnect");
526 /* Some error on the client connection, enter disconnected state */
527 if (dsi_disconnect(dsi) != 0)
528 afp_dsi_die(EXITERR_CLNT);
530 while (dsi->flags & DSI_DISCONNECTED)
531 pause(); /* gets interrupted by SIGALARM or SIGURG tickle */
532 continue; /* continue receiving until disconnect timer expires
533 * or a primary reconnect succeeds */
536 if (!(dsi->flags & DSI_EXTSLEEP) && (dsi->flags & DSI_SLEEPING)) {
537 LOG(log_debug, logtype_afpd, "afp_over_dsi: got data, ending normal sleep");
538 dsi->flags &= ~DSI_SLEEPING;
542 if (reload_request) {
544 load_volumes(AFPobj);
547 /* The first SIGINT enables debugging, the next restores the config */
549 static int debugging = 0;
556 if (obj->options.logconfig)
557 setuplog(obj->options.logconfig);
559 setuplog("default log_note");
564 sprintf(logstr, "default log_maxdebug /tmp/afpd.%u.XXXXXX", getpid());
570 dsi->flags |= DSI_DATA;
576 LOG(log_debug, logtype_afpd, "DSI: close session request");
578 LOG(log_note, logtype_afpd, "done");
582 dsi->flags &= ~DSI_DATA; /* thats no data in the sense we use it in alarm_handler */
583 LOG(log_debug, logtype_afpd, "DSI: client tickle");
584 /* timer is not every 30 seconds anymore, so we don't get killed on the client side. */
585 if ((dsi->flags & DSI_DIE))
592 if ( flushfork( writtenfork ) < 0 ) {
593 LOG(log_error, logtype_afpd, "main flushfork: %s", strerror(errno) );
599 function = (u_char) dsi->commands[0];
601 /* AFP replay cache */
602 rc_idx = dsi->clientID % REPLAYCACHE_SIZE;
603 LOG(log_debug, logtype_dsi, "DSI request ID: %u", dsi->clientID);
605 if (replaycache[rc_idx].DSIreqID == dsi->clientID
606 && replaycache[rc_idx].AFPcommand == function) {
607 LOG(log_note, logtype_afpd, "AFP Replay Cache match: id: %u / cmd: %s",
608 dsi->clientID, AfpNum2name(function));
609 err = replaycache[rc_idx].result;
610 /* AFP replay cache end */
612 /* send off an afp command. in a couple cases, we take advantage
613 * of the fact that we're a stream-based protocol. */
614 if (afp_switch[function]) {
615 dsi->datalen = DSI_DATASIZ;
616 dsi->flags |= DSI_RUNNING;
618 LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
620 err = (*afp_switch[function])(obj,
621 (char *)&dsi->commands, dsi->cmdlen,
622 (char *)&dsi->data, &dsi->datalen);
624 LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
625 AfpNum2name(function), AfpErr2name(err));
627 dir_free_invalid_q();
630 /* bring everything back to old euid, egid */
632 restore_uidgid ( &obj->uidgid );
633 #endif /* FORCE_UIDGID */
634 dsi->flags &= ~DSI_RUNNING;
636 /* Add result to the AFP replay cache */
637 replaycache[rc_idx].DSIreqID = dsi->clientID;
638 replaycache[rc_idx].AFPcommand = function;
639 replaycache[rc_idx].result = err;
641 LOG(log_error, logtype_afpd, "bad function %X", function);
647 /* single shot toggle that gets set by dsi_readinit. */
648 if (dsi->flags & DSI_NOREPLY) {
649 dsi->flags &= ~DSI_NOREPLY;
651 } else if (!dsi_cmdreply(dsi, err)) {
652 LOG(log_error, logtype_afpd, "dsi_cmdreply(%d): %s", dsi->socket, strerror(errno) );
653 if (dsi_disconnect(dsi) != 0)
654 afp_dsi_die(EXITERR_CLNT);
658 case DSIFUNC_WRITE: /* FPWrite and FPAddIcon */
659 function = (u_char) dsi->commands[0];
660 if ( afp_switch[ function ] != NULL ) {
661 dsi->datalen = DSI_DATASIZ;
662 dsi->flags |= DSI_RUNNING;
664 LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
666 err = (*afp_switch[function])(obj,
667 (char *)&dsi->commands, dsi->cmdlen,
668 (char *)&dsi->data, &dsi->datalen);
670 LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
671 AfpNum2name(function), AfpErr2name(err));
673 dsi->flags &= ~DSI_RUNNING;
675 /* bring everything back to old euid, egid */
677 restore_uidgid ( &obj->uidgid );
678 #endif /* FORCE_UIDGID */
680 LOG(log_error, logtype_afpd, "(write) bad function %x", function);
685 if (!dsi_wrtreply(dsi, err)) {
686 LOG(log_error, logtype_afpd, "dsi_wrtreply: %s", strerror(errno) );
687 if (dsi_disconnect(dsi) != 0)
688 afp_dsi_die(EXITERR_CLNT);
692 case DSIFUNC_ATTN: /* attention replies */
695 /* error. this usually implies a mismatch of some kind
696 * between server and client. if things are correct,
697 * we need to flush the rest of the packet if necessary. */
699 LOG(log_info, logtype_afpd,"afp_dsi: spurious command %d", cmd);
700 dsi_writeinit(dsi, dsi->data, DSI_DATASIZ);
704 pending_request(dsi);
706 fce_pending_events(obj);
710 afp_dsi_die(EXITERR_CLNT);