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>
40 #include <atalk/globals.h>
41 #include <atalk/netatalk_conf.h>
49 #define SOL_TCP IPPROTO_TCP
53 * We generally pass this from afp_over_dsi to all afp_* funcs, so it should already be
54 * available everywhere. Unfortunately some funcs (eg acltoownermode) need acces to it
55 * but are deeply nested in the function chain with the caller already without acces to it.
56 * Changing this would require adding a reference to the caller which itself might be
57 * called in many places (eg acltoownermode is called from accessmode).
58 * The only sane way out is providing a copy of it here:
60 AFPObj *AFPobj = NULL;
71 * - indexed just by taking DSIreqID mod REPLAYCACHE_SIZE
73 static rc_elem_t replaycache[REPLAYCACHE_SIZE];
75 static sigjmp_buf recon_jmp;
76 static void afp_dsi_close(AFPObj *obj)
83 /* we may have been called from a signal handler caught when afpd was running
84 * as uid 0, that's the wrong user for volume's prexec_close scripts if any,
85 * restore our login user
87 if (geteuid() != obj->uid) {
88 if (seteuid( obj->uid ) < 0) {
89 LOG(log_error, logtype_afpd, "can't seteuid(%u) back %s: uid: %u, euid: %u",
90 obj->uid, strerror(errno), getuid(), geteuid());
99 LOG(log_note, logtype_afpd, "AFP statistics: %.2f KB read, %.2f KB written",
100 dsi->read_count/1024.0, dsi->write_count/1024.0);
106 /* -------------------------------
108 * a little bit of code duplication.
110 static void afp_dsi_die(int sig)
112 DSI *dsi = (DSI *)AFPobj->dsi;
114 if (dsi->flags & DSI_RECONINPROG) {
115 /* Primary reconnect succeeded, got SIGTERM from afpd parent */
116 dsi->flags &= ~DSI_RECONINPROG;
117 return; /* this returns to afp_disconnect */
120 if (dsi->flags & DSI_DISCONNECTED) {
121 LOG(log_note, logtype_afpd, "Disconnected session terminating");
125 dsi_attention(AFPobj->dsi, AFPATTN_SHUTDOWN);
126 afp_dsi_close(AFPobj);
127 if (sig) /* if no signal, assume dieing because logins are disabled &
128 don't log it (maintenance mode)*/
129 LOG(log_info, logtype_afpd, "Connection terminated");
130 if (sig == SIGTERM || sig == SIGALRM) {
138 /* SIGQUIT handler */
139 static void ipc_reconnect_handler(int sig _U_)
141 DSI *dsi = (DSI *)AFPobj->dsi;
143 if (reconnect_ipc(AFPobj) != 0) {
144 LOG(log_error, logtype_afpd, "ipc_reconnect_handler: failed IPC reconnect");
145 afp_dsi_close(AFPobj);
149 if (ipc_child_write(AFPobj->ipc_fd, IPC_GETSESSION, AFPobj->sinfo.clientid_len, AFPobj->sinfo.clientid) != 0) {
150 LOG(log_error, logtype_afpd, "ipc_reconnect_handler: failed IPC ID resend");
151 afp_dsi_close(AFPobj);
154 LOG(log_note, logtype_afpd, "ipc_reconnect_handler: IPC reconnect done");
157 /* SIGURG handler (primary reconnect) */
158 static void afp_dsi_transfer_session(int sig _U_)
162 DSI *dsi = (DSI *)AFPobj->dsi;
164 LOG(log_debug, logtype_afpd, "afp_dsi_transfer_session: got SIGURG, trying to receive session");
166 if (readt(AFPobj->ipc_fd, &dsiID, 2, 0, 2) != 2) {
167 LOG(log_error, logtype_afpd, "afp_dsi_transfer_session: couldn't receive DSI id, goodbye");
168 afp_dsi_close(AFPobj);
172 if ((socket = recv_fd(AFPobj->ipc_fd, 1)) == -1) {
173 LOG(log_error, logtype_afpd, "afp_dsi_transfer_session: couldn't receive session fd, goodbye");
174 afp_dsi_close(AFPobj);
178 LOG(log_debug, logtype_afpd, "afp_dsi_transfer_session: received socket fd: %i", socket);
180 dsi->proto_close(dsi);
181 dsi->socket = socket;
182 dsi->flags = DSI_RECONSOCKET;
184 dsi->eof = dsi->start = dsi->buffer;
186 dsi->header.dsi_requestID = dsiID;
187 dsi->header.dsi_command = DSIFUNC_CMD;
190 * The session transfer happens in the middle of FPDisconnect old session, thus we
191 * have to send the reply now.
193 if (!dsi_cmdreply(dsi, AFP_OK)) {
194 LOG(log_error, logtype_afpd, "dsi_cmdreply: %s", strerror(errno) );
195 afp_dsi_close(AFPobj);
199 LOG(log_note, logtype_afpd, "afp_dsi_transfer_session: succesfull primary reconnect");
201 * Now returning from this signal handler return to dsi_receive which should start
202 * reading/continuing from the connected socket that was passed via the parent from
203 * another session. The parent will terminate that session.
205 siglongjmp(recon_jmp, 1);
208 /* ------------------- */
209 static void afp_dsi_timedown(int sig _U_)
213 DSI *dsi = (DSI *)AFPobj->dsi;
214 dsi->flags |= DSI_DIE;
215 /* shutdown and don't reconnect. server going down in 5 minutes. */
216 setmessage("The server is going down for maintenance.");
217 if (dsi_attention(AFPobj->dsi, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
218 AFPATTN_MESG | AFPATTN_TIME(5)) < 0) {
219 DSI *dsi = (DSI *)AFPobj->dsi;
220 dsi->down_request = 1;
223 it.it_interval.tv_sec = 0;
224 it.it_interval.tv_usec = 0;
225 it.it_value.tv_sec = 300;
226 it.it_value.tv_usec = 0;
228 if ( setitimer( ITIMER_REAL, &it, NULL ) < 0 ) {
229 LOG(log_error, logtype_afpd, "afp_timedown: setitimer: %s", strerror(errno) );
230 afp_dsi_die(EXITERR_SYS);
232 memset(&sv, 0, sizeof(sv));
233 sv.sa_handler = afp_dsi_die;
234 sigemptyset( &sv.sa_mask );
235 sigaddset(&sv.sa_mask, SIGHUP);
236 sigaddset(&sv.sa_mask, SIGTERM);
237 sv.sa_flags = SA_RESTART;
238 if ( sigaction( SIGALRM, &sv, NULL ) < 0 ) {
239 LOG(log_error, logtype_afpd, "afp_timedown: sigaction: %s", strerror(errno) );
240 afp_dsi_die(EXITERR_SYS);
244 sv.sa_handler = SIG_IGN;
245 sigemptyset( &sv.sa_mask );
246 sv.sa_flags = SA_RESTART;
247 if ( sigaction( SIGUSR1, &sv, NULL ) < 0 ) {
248 LOG(log_error, logtype_afpd, "afp_timedown: sigaction SIGHUP: %s", strerror(errno) );
249 afp_dsi_die(EXITERR_SYS);
253 /* ---------------------------------
254 * SIGHUP reload configuration file
256 volatile int reload_request = 0;
258 static void afp_dsi_reload(int sig _U_)
263 /* ---------------------------------
264 * SIGINT: enable max_debug LOGging
266 static volatile sig_atomic_t debug_request = 0;
268 static void afp_dsi_debug(int sig _U_)
273 /* ---------------------- */
274 static void afp_dsi_getmesg (int sig _U_)
276 DSI *dsi = (DSI *)AFPobj->dsi;
278 dsi->msg_request = 1;
279 if (dsi_attention(AFPobj->dsi, AFPATTN_MESG | AFPATTN_TIME(5)) < 0)
280 dsi->msg_request = 2;
283 static void alarm_handler(int sig _U_)
286 DSI *dsi = (DSI *)AFPobj->dsi;
288 /* we have to restart the timer because some libraries may use alarm() */
289 setitimer(ITIMER_REAL, &dsi->timer, NULL);
291 /* we got some traffic from the client since the previous timer tick. */
292 if ((dsi->flags & DSI_DATA)) {
293 dsi->flags &= ~DSI_DATA;
298 LOG(log_maxdebug, logtype_afpd, "alarm: tickles: %u, flags: %s|%s|%s|%s|%s|%s|%s|%s|%s",
300 (dsi->flags & DSI_DATA) ? "DSI_DATA" : "-",
301 (dsi->flags & DSI_RUNNING) ? "DSI_RUNNING" : "-",
302 (dsi->flags & DSI_SLEEPING) ? "DSI_SLEEPING" : "-",
303 (dsi->flags & DSI_EXTSLEEP) ? "DSI_EXTSLEEP" : "-",
304 (dsi->flags & DSI_DISCONNECTED) ? "DSI_DISCONNECTED" : "-",
305 (dsi->flags & DSI_DIE) ? "DSI_DIE" : "-",
306 (dsi->flags & DSI_NOREPLY) ? "DSI_NOREPLY" : "-",
307 (dsi->flags & DSI_RECONSOCKET) ? "DSI_RECONSOCKET" : "-",
308 (dsi->flags & DSI_RECONINPROG) ? "DSI_RECONINPROG" : "-");
310 if (dsi->flags & DSI_SLEEPING) {
311 if (dsi->tickle > AFPobj->options.sleep) {
312 LOG(log_note, logtype_afpd, "afp_alarm: sleep time ended");
313 afp_dsi_die(EXITERR_CLNT);
318 if (dsi->flags & DSI_DISCONNECTED) {
319 if (geteuid() == 0) {
320 LOG(log_note, logtype_afpd, "afp_alarm: unauthenticated user, connection problem");
321 afp_dsi_die(EXITERR_CLNT);
323 if (dsi->tickle > AFPobj->options.disconnected) {
324 LOG(log_error, logtype_afpd, "afp_alarm: reconnect timer expired, goodbye");
325 afp_dsi_die(EXITERR_CLNT);
330 /* if we're in the midst of processing something, don't die. */
331 if (dsi->tickle >= AFPobj->options.timeout) {
332 LOG(log_error, logtype_afpd, "afp_alarm: child timed out, entering disconnected state");
333 if (dsi_disconnect(dsi) != 0)
334 afp_dsi_die(EXITERR_CLNT);
338 if ((err = pollvoltime(AFPobj)) == 0)
339 LOG(log_debug, logtype_afpd, "afp_alarm: sending DSI tickle");
340 err = dsi_tickle(AFPobj->dsi);
342 if (geteuid() == 0) {
343 LOG(log_note, logtype_afpd, "afp_alarm: unauthenticated user, connection problem");
344 afp_dsi_die(EXITERR_CLNT);
346 LOG(log_error, logtype_afpd, "afp_alarm: connection problem, entering disconnected state");
347 if (dsi_disconnect(dsi) != 0)
348 afp_dsi_die(EXITERR_CLNT);
353 if dsi->in_write is set attention, tickle (and close?) msg
354 aren't sent. We don't care about tickle
356 static void pending_request(DSI *dsi)
358 /* send pending attention */
360 /* read msg if any, it could be done in afp_getsrvrmesg */
361 if (dsi->msg_request) {
362 if (dsi->msg_request == 2) {
363 /* didn't send it in signal handler */
364 dsi_attention(AFPobj->dsi, AFPATTN_MESG | AFPATTN_TIME(5));
366 dsi->msg_request = 0;
369 if (dsi->down_request) {
370 dsi->down_request = 0;
371 dsi_attention(AFPobj->dsi, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
372 AFPATTN_MESG | AFPATTN_TIME(5));
376 /* -------------------------------------------
377 afp over dsi. this never returns.
379 void afp_over_dsi(AFPObj *obj)
381 DSI *dsi = (DSI *) obj->dsi;
385 struct sigaction action;
388 obj->exit = afp_dsi_die;
389 obj->reply = (int (*)()) dsi_cmdreply;
390 obj->attention = (int (*)(void *, AFPUserBytes)) dsi_attention;
393 memset(&action, 0, sizeof(action));
394 sigfillset(&action.sa_mask);
395 action.sa_flags = SA_RESTART;
398 action.sa_handler = afp_dsi_reload;
399 if ( sigaction( SIGHUP, &action, NULL ) < 0 ) {
400 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
401 afp_dsi_die(EXITERR_SYS);
405 action.sa_handler = afp_dsi_transfer_session;
406 if ( sigaction( SIGURG, &action, NULL ) < 0 ) {
407 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
408 afp_dsi_die(EXITERR_SYS);
411 /* install SIGTERM */
412 action.sa_handler = afp_dsi_die;
413 if ( sigaction( SIGTERM, &action, NULL ) < 0 ) {
414 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
415 afp_dsi_die(EXITERR_SYS);
418 /* install SIGQUIT */
419 action.sa_handler = ipc_reconnect_handler;
420 if ( sigaction(SIGQUIT, &action, NULL ) < 0 ) {
421 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
422 afp_dsi_die(EXITERR_SYS);
425 /* SIGUSR2 - server message support */
426 action.sa_handler = afp_dsi_getmesg;
427 if ( sigaction( SIGUSR2, &action, NULL) < 0 ) {
428 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
429 afp_dsi_die(EXITERR_SYS);
432 /* SIGUSR1 - set down in 5 minutes */
433 action.sa_handler = afp_dsi_timedown;
434 action.sa_flags = SA_RESTART;
435 if ( sigaction( SIGUSR1, &action, NULL) < 0 ) {
436 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
437 afp_dsi_die(EXITERR_SYS);
440 /* SIGINT - enable max_debug LOGging to /tmp/afpd.PID.XXXXXX */
441 action.sa_handler = afp_dsi_debug;
442 if ( sigaction( SIGINT, &action, NULL) < 0 ) {
443 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
444 afp_dsi_die(EXITERR_SYS);
448 /* SIGALRM - tickle handler */
449 action.sa_handler = alarm_handler;
450 if ((sigaction(SIGALRM, &action, NULL) < 0) ||
451 (setitimer(ITIMER_REAL, &dsi->timer, NULL) < 0)) {
452 afp_dsi_die(EXITERR_SYS);
454 #endif /* DEBUGGING */
456 if (dircache_init(obj->options.dircachesize) != 0)
457 afp_dsi_die(EXITERR_SYS);
459 /* set TCP snd/rcv buf */
460 if (obj->options.tcp_rcvbuf) {
461 if (setsockopt(dsi->socket,
464 &obj->options.tcp_rcvbuf,
465 sizeof(obj->options.tcp_rcvbuf)) != 0) {
466 LOG(log_error, logtype_dsi, "afp_over_dsi: setsockopt(SO_RCVBUF): %s", strerror(errno));
469 if (obj->options.tcp_sndbuf) {
470 if (setsockopt(dsi->socket,
473 &obj->options.tcp_sndbuf,
474 sizeof(obj->options.tcp_sndbuf)) != 0) {
475 LOG(log_error, logtype_dsi, "afp_over_dsi: setsockopt(SO_SNDBUF): %s", strerror(errno));
479 /* set TCP_NODELAY */
481 setsockopt(dsi->socket, SOL_TCP, TCP_NODELAY, &flag, sizeof(flag));
483 /* get stuck here until the end */
485 if (sigsetjmp(recon_jmp, 1) != 0)
486 /* returning from SIGALARM handler for a primary reconnect */
489 /* Blocking read on the network socket */
490 cmd = dsi_stream_receive(dsi);
493 /* cmd == 0 is the error condition */
494 if (dsi->flags & DSI_RECONSOCKET) {
495 /* we just got a reconnect so we immediately try again to receive on the new fd */
496 dsi->flags &= ~DSI_RECONSOCKET;
500 /* the client sometimes logs out (afp_logout) but doesn't close the DSI session */
501 if (dsi->flags & DSI_AFP_LOGGED_OUT) {
502 LOG(log_note, logtype_afpd, "afp_over_dsi: client logged out, terminating DSI session");
508 /* got ECONNRESET in read from client => exit*/
509 if (dsi->flags & DSI_GOT_ECONNRESET) {
510 LOG(log_note, logtype_afpd, "afp_over_dsi: client connection reset");
516 if (dsi->flags & DSI_RECONINPROG) {
517 LOG(log_note, logtype_afpd, "afp_over_dsi: failed reconnect");
522 /* Some error on the client connection, enter disconnected state */
523 if (dsi_disconnect(dsi) != 0)
524 afp_dsi_die(EXITERR_CLNT);
526 while (dsi->flags & DSI_DISCONNECTED)
527 pause(); /* gets interrupted by SIGALARM or SIGURG tickle */
528 continue; /* continue receiving until disconnect timer expires
529 * or a primary reconnect succeeds */
532 if (!(dsi->flags & DSI_EXTSLEEP) && (dsi->flags & DSI_SLEEPING)) {
533 LOG(log_debug, logtype_afpd, "afp_over_dsi: got data, ending normal sleep");
534 dsi->flags &= ~DSI_SLEEPING;
538 if (reload_request) {
540 load_volumes(AFPobj, closevol);
543 /* The first SIGINT enables debugging, the next restores the config */
545 static int debugging = 0;
552 if (obj->options.logconfig)
553 setuplog(obj->options.logconfig, obj->options.logfile);
555 setuplog("default:note", NULL);
560 sprintf(logstr, "/tmp/afpd.%u.XXXXXX", getpid());
561 setuplog("default:maxdebug", logstr);
566 dsi->flags |= DSI_DATA;
572 LOG(log_debug, logtype_afpd, "DSI: close session request");
574 LOG(log_note, logtype_afpd, "done");
578 dsi->flags &= ~DSI_DATA; /* thats no data in the sense we use it in alarm_handler */
579 LOG(log_debug, logtype_afpd, "DSI: client tickle");
580 /* timer is not every 30 seconds anymore, so we don't get killed on the client side. */
581 if ((dsi->flags & DSI_DIE))
588 if ( flushfork( writtenfork ) < 0 ) {
589 LOG(log_error, logtype_afpd, "main flushfork: %s", strerror(errno) );
595 function = (u_char) dsi->commands[0];
597 /* AFP replay cache */
598 rc_idx = dsi->clientID % REPLAYCACHE_SIZE;
599 LOG(log_debug, logtype_dsi, "DSI request ID: %u", dsi->clientID);
601 if (replaycache[rc_idx].DSIreqID == dsi->clientID
602 && replaycache[rc_idx].AFPcommand == function) {
603 LOG(log_note, logtype_afpd, "AFP Replay Cache match: id: %u / cmd: %s",
604 dsi->clientID, AfpNum2name(function));
605 err = replaycache[rc_idx].result;
606 /* AFP replay cache end */
608 /* send off an afp command. in a couple cases, we take advantage
609 * of the fact that we're a stream-based protocol. */
610 if (afp_switch[function]) {
611 dsi->datalen = DSI_DATASIZ;
612 dsi->flags |= DSI_RUNNING;
614 LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
616 err = (*afp_switch[function])(obj,
617 (char *)&dsi->commands, dsi->cmdlen,
618 (char *)&dsi->data, &dsi->datalen);
620 LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
621 AfpNum2name(function), AfpErr2name(err));
623 dir_free_invalid_q();
625 dsi->flags &= ~DSI_RUNNING;
627 /* Add result to the AFP replay cache */
628 replaycache[rc_idx].DSIreqID = dsi->clientID;
629 replaycache[rc_idx].AFPcommand = function;
630 replaycache[rc_idx].result = err;
632 LOG(log_error, logtype_afpd, "bad function %X", function);
638 /* single shot toggle that gets set by dsi_readinit. */
639 if (dsi->flags & DSI_NOREPLY) {
640 dsi->flags &= ~DSI_NOREPLY;
642 } else if (!dsi_cmdreply(dsi, err)) {
643 LOG(log_error, logtype_afpd, "dsi_cmdreply(%d): %s", dsi->socket, strerror(errno) );
644 if (dsi_disconnect(dsi) != 0)
645 afp_dsi_die(EXITERR_CLNT);
649 case DSIFUNC_WRITE: /* FPWrite and FPAddIcon */
650 function = (u_char) dsi->commands[0];
651 if ( afp_switch[ function ] != NULL ) {
652 dsi->datalen = DSI_DATASIZ;
653 dsi->flags |= DSI_RUNNING;
655 LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
657 err = (*afp_switch[function])(obj,
658 (char *)&dsi->commands, dsi->cmdlen,
659 (char *)&dsi->data, &dsi->datalen);
661 LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
662 AfpNum2name(function), AfpErr2name(err));
664 dsi->flags &= ~DSI_RUNNING;
666 LOG(log_error, logtype_afpd, "(write) bad function %x", function);
671 if (!dsi_wrtreply(dsi, err)) {
672 LOG(log_error, logtype_afpd, "dsi_wrtreply: %s", strerror(errno) );
673 if (dsi_disconnect(dsi) != 0)
674 afp_dsi_die(EXITERR_CLNT);
678 case DSIFUNC_ATTN: /* attention replies */
681 /* error. this usually implies a mismatch of some kind
682 * between server and client. if things are correct,
683 * we need to flush the rest of the packet if necessary. */
685 LOG(log_info, logtype_afpd,"afp_dsi: spurious command %d", cmd);
686 dsi_writeinit(dsi, dsi->data, DSI_DATASIZ);
690 pending_request(dsi);
692 fce_pending_events(obj);
696 afp_dsi_die(EXITERR_CLNT);