2 * $Id: afp_dsi.c,v 1.53 2010/03/30 12:55:26 franklahm Exp $
4 * Copyright (c) 1999 Adrian Sun (asun@zoology.washington.edu)
5 * Copyright (c) 1990,1993 Regents of The University of Michigan.
6 * All Rights Reserved. See COPYRIGHT.
8 * modified from main.c. this handles afp over tcp.
13 #endif /* HAVE_CONFIG_H */
22 #endif /* HAVE_UNISTD_H */
23 #include <sys/socket.h>
25 #ifdef HAVE_SYS_STAT_H
27 #endif /* HAVE_SYS_STAT_H */
28 #include <netinet/in.h>
29 #include <arpa/inet.h>
30 #include <atalk/logger.h>
32 #include <atalk/dsi.h>
33 #include <atalk/compat.h>
34 #include <atalk/util.h>
45 #endif /* FORCE_UIDGID */
47 #define CHILD_DIE (1 << 0)
48 #define CHILD_RUNNING (1 << 1)
49 #define CHILD_SLEEPING (1 << 2)
50 #define CHILD_DATA (1 << 3)
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;
69 static void afp_dsi_close(AFPObj *obj)
71 DSI *dsi = obj->handle;
73 /* we may have been called from a signal handler caught when afpd was running
74 * as uid 0, that's the wrong user for volume's prexec_close scripts if any,
75 * restore our login user
77 if (geteuid() != obj->uid) {
78 if (seteuid( obj->uid ) < 0) {
79 LOG(log_error, logtype_afpd, "can't seteuid(%u) back %s: uid: %u, euid: %u",
80 obj->uid, strerror(errno), getuid(), geteuid());
89 LOG(log_info, logtype_afpd, "%.2fKB read, %.2fKB written",
90 dsi->read_count/1024.0, dsi->write_count/1024.0);
95 /* -------------------------------
97 * a little bit of code duplication.
99 static void afp_dsi_die(int sig)
101 static volatile int in_handler;
106 /* it's not atomic but we don't care because it's an exit function
107 * ie if a signal is received here, between the test and the affectation,
108 * it will not return.
112 dsi_attention(child.obj->handle, AFPATTN_SHUTDOWN);
113 afp_dsi_close(child.obj);
114 if (sig) /* if no signal, assume dieing because logins are disabled &
115 don't log it (maintenance mode)*/
116 LOG(log_info, logtype_afpd, "Connection terminated");
117 if (sig == SIGTERM || sig == SIGALRM) {
126 static void afp_dsi_sleep(void)
128 child.flags |= CHILD_SLEEPING;
129 dsi_sleep(child.obj->handle, 1);
132 /* ------------------- */
133 static void afp_dsi_timedown(int sig _U_)
138 child.flags |= CHILD_DIE;
139 /* shutdown and don't reconnect. server going down in 5 minutes. */
140 setmessage("The server is going down for maintenance.");
141 if (dsi_attention(child.obj->handle, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
142 AFPATTN_MESG | AFPATTN_TIME(5)) < 0) {
143 DSI *dsi = (DSI *) child.obj->handle;
144 dsi->down_request = 1;
147 it.it_interval.tv_sec = 0;
148 it.it_interval.tv_usec = 0;
149 it.it_value.tv_sec = 300;
150 it.it_value.tv_usec = 0;
152 if ( setitimer( ITIMER_REAL, &it, NULL ) < 0 ) {
153 LOG(log_error, logtype_afpd, "afp_timedown: setitimer: %s", strerror(errno) );
154 afp_dsi_die(EXITERR_SYS);
156 memset(&sv, 0, sizeof(sv));
157 sv.sa_handler = afp_dsi_die;
158 sigemptyset( &sv.sa_mask );
159 sigaddset(&sv.sa_mask, SIGHUP);
160 sigaddset(&sv.sa_mask, SIGTERM);
161 sv.sa_flags = SA_RESTART;
162 if ( sigaction( SIGALRM, &sv, NULL ) < 0 ) {
163 LOG(log_error, logtype_afpd, "afp_timedown: sigaction: %s", strerror(errno) );
164 afp_dsi_die(EXITERR_SYS);
168 sv.sa_handler = SIG_IGN;
169 sigemptyset( &sv.sa_mask );
170 sv.sa_flags = SA_RESTART;
171 if ( sigaction( SIGUSR1, &sv, NULL ) < 0 ) {
172 LOG(log_error, logtype_afpd, "afp_timedown: sigaction SIGHUP: %s", strerror(errno) );
173 afp_dsi_die(EXITERR_SYS);
177 /* ---------------------------------
178 * SIGHUP reload configuration file
179 * FIXME here or we wait ?
181 volatile int reload_request = 0;
183 static void afp_dsi_reload(int sig _U_)
188 /* ---------------------------------
189 * SIGINT: enable max_debug LOGging
191 static volatile sig_atomic_t debug_request = 0;
193 static void afp_dsi_debug(int sig _U_)
198 /* ---------------------- */
200 static void afp_dsi_getmesg (int sig _U_)
202 DSI *dsi = (DSI *) child.obj->handle;
204 dsi->msg_request = 1;
205 if (dsi_attention(child.obj->handle, AFPATTN_MESG | AFPATTN_TIME(5)) < 0)
206 dsi->msg_request = 2;
208 #endif /* SERVERTEXT */
210 static void alarm_handler(int sig _U_)
213 DSI *dsi = (DSI *) child.obj->handle;
215 /* we have to restart the timer because some libraries
217 setitimer(ITIMER_REAL, &dsi->timer, NULL);
219 /* we got some traffic from the client since the previous timer
221 if ((child.flags & CHILD_DATA)) {
222 child.flags &= ~CHILD_DATA;
226 /* if we're in the midst of processing something,
228 if ((child.flags & CHILD_SLEEPING) && child.tickle++ < child.obj->options.sleep) {
232 if ((child.flags & CHILD_RUNNING) || (child.tickle++ < child.obj->options.timeout)) {
233 if (!(err = pollvoltime(child.obj)))
234 err = dsi_tickle(child.obj->handle);
236 afp_dsi_die(EXITERR_CLNT);
238 } else { /* didn't receive a tickle. close connection */
239 LOG(log_error, logtype_afpd, "afp_alarm: child timed out");
240 afp_dsi_die(EXITERR_CLNT);
245 if dsi->in_write is set attention, tickle (and close?) msg
246 aren't sent. We don't care about tickle
248 static void pending_request(DSI *dsi)
250 /* send pending attention */
252 /* read msg if any, it could be done in afp_getsrvrmesg */
253 if (dsi->msg_request) {
254 if (dsi->msg_request == 2) {
255 /* didn't send it in signal handler */
256 dsi_attention(child.obj->handle, AFPATTN_MESG | AFPATTN_TIME(5));
258 dsi->msg_request = 0;
259 readmessage(child.obj);
261 if (dsi->down_request) {
262 dsi->down_request = 0;
263 dsi_attention(child.obj->handle, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
264 AFPATTN_MESG | AFPATTN_TIME(5));
268 /* -------------------------------------------
269 afp over dsi. this never returns.
271 void afp_over_dsi(AFPObj *obj)
273 DSI *dsi = (DSI *) obj->handle;
276 struct sigaction action;
279 obj->exit = afp_dsi_die;
280 obj->reply = (int (*)()) dsi_cmdreply;
281 obj->attention = (int (*)(void *, AFPUserBytes)) dsi_attention;
283 obj->sleep = afp_dsi_sleep;
285 child.tickle = child.flags = 0;
287 memset(&action, 0, sizeof(action));
290 action.sa_handler = afp_dsi_reload;
291 sigemptyset( &action.sa_mask );
292 sigaddset(&action.sa_mask, SIGALRM);
293 sigaddset(&action.sa_mask, SIGTERM);
294 sigaddset(&action.sa_mask, SIGUSR1);
295 sigaddset(&action.sa_mask, SIGINT);
297 sigaddset(&action.sa_mask, SIGUSR2);
299 action.sa_flags = SA_RESTART;
300 if ( sigaction( SIGHUP, &action, NULL ) < 0 ) {
301 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
302 afp_dsi_die(EXITERR_SYS);
305 /* install SIGTERM */
306 action.sa_handler = afp_dsi_die;
307 sigemptyset( &action.sa_mask );
308 sigaddset(&action.sa_mask, SIGALRM);
309 sigaddset(&action.sa_mask, SIGHUP);
310 sigaddset(&action.sa_mask, SIGUSR1);
311 sigaddset(&action.sa_mask, SIGINT);
313 sigaddset(&action.sa_mask, SIGUSR2);
315 action.sa_flags = SA_RESTART;
316 if ( sigaction( SIGTERM, &action, NULL ) < 0 ) {
317 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
318 afp_dsi_die(EXITERR_SYS);
322 /* Added for server message support */
323 action.sa_handler = afp_dsi_getmesg;
324 sigemptyset( &action.sa_mask );
325 sigaddset(&action.sa_mask, SIGALRM);
326 sigaddset(&action.sa_mask, SIGTERM);
327 sigaddset(&action.sa_mask, SIGUSR1);
328 sigaddset(&action.sa_mask, SIGHUP);
329 sigaddset(&action.sa_mask, SIGINT);
330 action.sa_flags = SA_RESTART;
331 if ( sigaction( SIGUSR2, &action, NULL) < 0 ) {
332 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
333 afp_dsi_die(EXITERR_SYS);
335 #endif /* SERVERTEXT */
337 /* SIGUSR1 - set down in 5 minutes */
338 action.sa_handler = afp_dsi_timedown;
339 sigemptyset( &action.sa_mask );
340 sigaddset(&action.sa_mask, SIGALRM);
341 sigaddset(&action.sa_mask, SIGHUP);
342 sigaddset(&action.sa_mask, SIGTERM);
343 sigaddset(&action.sa_mask, SIGINT);
345 sigaddset(&action.sa_mask, SIGUSR2);
347 action.sa_flags = SA_RESTART;
348 if ( sigaction( SIGUSR1, &action, NULL) < 0 ) {
349 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
350 afp_dsi_die(EXITERR_SYS);
353 /* SIGINT - enable max_debug LOGging to /tmp/afpd.PID.XXXXXX */
354 action.sa_handler = afp_dsi_debug;
355 sigfillset( &action.sa_mask );
356 action.sa_flags = SA_RESTART;
357 if ( sigaction( SIGINT, &action, NULL) < 0 ) {
358 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
359 afp_dsi_die(EXITERR_SYS);
364 action.sa_handler = alarm_handler;
365 sigemptyset(&action.sa_mask);
366 sigaddset(&action.sa_mask, SIGHUP);
367 sigaddset(&action.sa_mask, SIGTERM);
368 sigaddset(&action.sa_mask, SIGUSR1);
369 sigaddset(&action.sa_mask, SIGINT);
371 sigaddset(&action.sa_mask, SIGUSR2);
373 action.sa_flags = SA_RESTART;
374 if ((sigaction(SIGALRM, &action, NULL) < 0) ||
375 (setitimer(ITIMER_REAL, &dsi->timer, NULL) < 0)) {
376 afp_dsi_die(EXITERR_SYS);
378 #endif /* DEBUGGING */
380 if (dircache_init(obj->options.dircachesize) != 0)
381 afp_dsi_die(EXITERR_SYS);
383 /* get stuck here until the end */
384 while ((cmd = dsi_receive(dsi))) {
386 child.flags &= ~CHILD_SLEEPING;
387 dsi_sleep(dsi, 0); /* wake up */
389 if (reload_request) {
391 load_volumes(child.obj);
399 /* The first SIGINT enables debugging, the second one kills us */
400 action.sa_handler = afp_dsi_die;
401 sigfillset( &action.sa_mask );
402 action.sa_flags = SA_RESTART;
403 if ( sigaction( SIGINT, &action, NULL ) < 0 ) {
404 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
405 afp_dsi_die(EXITERR_SYS);
408 sprintf(logstr, "default log_maxdebug /tmp/afpd.%u.XXXXXX", getpid());
412 if (cmd == DSIFUNC_TICKLE) {
413 /* timer is not every 30 seconds anymore, so we don't get killed on the client side. */
414 if ((child.flags & CHILD_DIE))
416 pending_request(dsi);
420 child.flags |= CHILD_DATA;
424 LOG(log_info, logtype_afpd, "done");
431 if ( flushfork( writtenfork ) < 0 ) {
432 LOG(log_error, logtype_afpd, "main flushfork: %s", strerror(errno) );
438 function = (u_char) dsi->commands[0];
440 /* send off an afp command. in a couple cases, we take advantage
441 * of the fact that we're a stream-based protocol. */
442 if (afp_switch[function]) {
443 dsi->datalen = DSI_DATASIZ;
444 child.flags |= CHILD_RUNNING;
446 LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
448 err = (*afp_switch[function])(obj,
449 (char *)&dsi->commands, dsi->cmdlen,
450 (char *)&dsi->data, &dsi->datalen);
452 LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
453 AfpNum2name(function), AfpErr2name(err));
455 /* bring everything back to old euid, egid */
457 restore_uidgid ( &obj->uidgid );
458 #endif /* FORCE_UIDGID */
459 child.flags &= ~CHILD_RUNNING;
461 LOG(log_error, logtype_afpd, "bad function %X", function);
466 /* single shot toggle that gets set by dsi_readinit. */
472 if (!dsi_cmdreply(dsi, err)) {
473 LOG(log_error, logtype_afpd, "dsi_cmdreply(%d): %s", dsi->socket, strerror(errno) );
474 afp_dsi_die(EXITERR_CLNT);
478 case DSIFUNC_WRITE: /* FPWrite and FPAddIcon */
479 function = (u_char) dsi->commands[0];
480 if ( afp_switch[ function ] != NULL ) {
481 dsi->datalen = DSI_DATASIZ;
482 child.flags |= CHILD_RUNNING;
484 LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
486 err = (*afp_switch[function])(obj,
487 (char *)&dsi->commands, dsi->cmdlen,
488 (char *)&dsi->data, &dsi->datalen);
490 LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
491 AfpNum2name(function), AfpErr2name(err));
493 child.flags &= ~CHILD_RUNNING;
495 /* bring everything back to old euid, egid */
497 restore_uidgid ( &obj->uidgid );
498 #endif /* FORCE_UIDGID */
500 LOG(log_error, logtype_afpd, "(write) bad function %x", function);
505 if (!dsi_wrtreply(dsi, err)) {
506 LOG(log_error, logtype_afpd, "dsi_wrtreply: %s", strerror(errno) );
507 afp_dsi_die(EXITERR_CLNT);
511 case DSIFUNC_ATTN: /* attention replies */
514 /* error. this usually implies a mismatch of some kind
515 * between server and client. if things are correct,
516 * we need to flush the rest of the packet if necessary. */
518 LOG(log_info, logtype_afpd,"afp_dsi: spurious command %d", cmd);
519 dsi_writeinit(dsi, dsi->data, DSI_DATASIZ);
523 pending_request(dsi);
527 afp_dsi_die(EXITERR_CLNT);