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>
30 #include <atalk/dsi.h>
31 #include <atalk/compat.h>
32 #include <atalk/util.h>
43 #endif /* FORCE_UIDGID */
45 #define CHILD_DIE (1 << 0)
46 #define CHILD_RUNNING (1 << 1)
47 #define CHILD_SLEEPING (1 << 2)
48 #define CHILD_DATA (1 << 3)
51 * We generally pass this from afp_over_dsi to all afp_* funcs, so it should already be
52 * available everywhere. Unfortunately some funcs (eg acltoownermode) need acces to it
53 * but are deeply nested in the function chain with the caller already without acces to it.
54 * Changing this would require adding a reference to the caller which itself might be
55 * called in many places (eg acltoownermode is called from accessmode).
56 * The only sane way out is providing a copy of it here:
58 AFPObj *AFPobj = NULL;
67 static void afp_dsi_close(AFPObj *obj)
69 DSI *dsi = obj->handle;
71 /* we may have been called from a signal handler caught when afpd was running
72 * as uid 0, that's the wrong user for volume's prexec_close scripts if any,
73 * restore our login user
75 if (geteuid() != obj->uid) {
76 if (seteuid( obj->uid ) < 0) {
77 LOG(log_error, logtype_afpd, "can't seteuid(%u) back %s: uid: %u, euid: %u",
78 obj->uid, strerror(errno), getuid(), geteuid());
87 LOG(log_info, logtype_afpd, "AFP statistics: %.2f KB read, %.2f KB written",
88 dsi->read_count/1024.0, dsi->write_count/1024.0);
94 /* -------------------------------
96 * a little bit of code duplication.
98 static void afp_dsi_die(int sig)
100 static volatile int in_handler;
105 /* it's not atomic but we don't care because it's an exit function
106 * ie if a signal is received here, between the test and the affectation,
107 * it will not return.
111 dsi_attention(child.obj->handle, AFPATTN_SHUTDOWN);
112 afp_dsi_close(child.obj);
113 if (sig) /* if no signal, assume dieing because logins are disabled &
114 don't log it (maintenance mode)*/
115 LOG(log_info, logtype_afpd, "Connection terminated");
116 if (sig == SIGTERM || sig == SIGALRM) {
125 static void afp_dsi_sleep(void)
127 child.flags |= CHILD_SLEEPING;
128 dsi_sleep(child.obj->handle, 1);
131 /* ------------------- */
132 static void afp_dsi_timedown(int sig _U_)
137 child.flags |= CHILD_DIE;
138 /* shutdown and don't reconnect. server going down in 5 minutes. */
139 setmessage("The server is going down for maintenance.");
140 if (dsi_attention(child.obj->handle, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
141 AFPATTN_MESG | AFPATTN_TIME(5)) < 0) {
142 DSI *dsi = (DSI *) child.obj->handle;
143 dsi->down_request = 1;
146 it.it_interval.tv_sec = 0;
147 it.it_interval.tv_usec = 0;
148 it.it_value.tv_sec = 300;
149 it.it_value.tv_usec = 0;
151 if ( setitimer( ITIMER_REAL, &it, NULL ) < 0 ) {
152 LOG(log_error, logtype_afpd, "afp_timedown: setitimer: %s", strerror(errno) );
153 afp_dsi_die(EXITERR_SYS);
155 memset(&sv, 0, sizeof(sv));
156 sv.sa_handler = afp_dsi_die;
157 sigemptyset( &sv.sa_mask );
158 sigaddset(&sv.sa_mask, SIGHUP);
159 sigaddset(&sv.sa_mask, SIGTERM);
160 sv.sa_flags = SA_RESTART;
161 if ( sigaction( SIGALRM, &sv, NULL ) < 0 ) {
162 LOG(log_error, logtype_afpd, "afp_timedown: sigaction: %s", strerror(errno) );
163 afp_dsi_die(EXITERR_SYS);
167 sv.sa_handler = SIG_IGN;
168 sigemptyset( &sv.sa_mask );
169 sv.sa_flags = SA_RESTART;
170 if ( sigaction( SIGUSR1, &sv, NULL ) < 0 ) {
171 LOG(log_error, logtype_afpd, "afp_timedown: sigaction SIGHUP: %s", strerror(errno) );
172 afp_dsi_die(EXITERR_SYS);
176 /* ---------------------------------
177 * SIGHUP reload configuration file
179 volatile int reload_request = 0;
181 static void afp_dsi_reload(int sig _U_)
186 /* ---------------------------------
187 * SIGINT: enable max_debug LOGging
189 static volatile sig_atomic_t debug_request = 0;
191 static void afp_dsi_debug(int sig _U_)
196 /* ---------------------- */
198 static void afp_dsi_getmesg (int sig _U_)
200 DSI *dsi = (DSI *) child.obj->handle;
202 dsi->msg_request = 1;
203 if (dsi_attention(child.obj->handle, AFPATTN_MESG | AFPATTN_TIME(5)) < 0)
204 dsi->msg_request = 2;
206 #endif /* SERVERTEXT */
208 static void alarm_handler(int sig _U_)
211 DSI *dsi = (DSI *) child.obj->handle;
213 /* we have to restart the timer because some libraries
215 setitimer(ITIMER_REAL, &dsi->timer, NULL);
217 /* we got some traffic from the client since the previous timer
219 if ((child.flags & CHILD_DATA)) {
220 child.flags &= ~CHILD_DATA;
224 /* if we're in the midst of processing something,
226 if ((child.flags & CHILD_SLEEPING) && child.tickle++ < child.obj->options.sleep) {
230 if ((child.flags & CHILD_RUNNING) || (child.tickle++ < child.obj->options.timeout)) {
231 if (!(err = pollvoltime(child.obj)))
232 err = dsi_tickle(child.obj->handle);
234 afp_dsi_die(EXITERR_CLNT);
236 } else { /* didn't receive a tickle. close connection */
237 LOG(log_error, logtype_afpd, "afp_alarm: child timed out");
238 afp_dsi_die(EXITERR_CLNT);
243 if dsi->in_write is set attention, tickle (and close?) msg
244 aren't sent. We don't care about tickle
246 static void pending_request(DSI *dsi)
248 /* send pending attention */
250 /* read msg if any, it could be done in afp_getsrvrmesg */
251 if (dsi->msg_request) {
252 if (dsi->msg_request == 2) {
253 /* didn't send it in signal handler */
254 dsi_attention(child.obj->handle, AFPATTN_MESG | AFPATTN_TIME(5));
256 dsi->msg_request = 0;
257 readmessage(child.obj);
259 if (dsi->down_request) {
260 dsi->down_request = 0;
261 dsi_attention(child.obj->handle, AFPATTN_SHUTDOWN | AFPATTN_NORECONNECT |
262 AFPATTN_MESG | AFPATTN_TIME(5));
266 /* -------------------------------------------
267 afp over dsi. this never returns.
269 void afp_over_dsi(AFPObj *obj)
271 DSI *dsi = (DSI *) obj->handle;
274 struct sigaction action;
277 obj->exit = afp_dsi_die;
278 obj->reply = (int (*)()) dsi_cmdreply;
279 obj->attention = (int (*)(void *, AFPUserBytes)) dsi_attention;
281 obj->sleep = afp_dsi_sleep;
283 child.tickle = child.flags = 0;
285 memset(&action, 0, sizeof(action));
288 action.sa_handler = afp_dsi_reload;
289 sigemptyset( &action.sa_mask );
290 sigaddset(&action.sa_mask, SIGALRM);
291 sigaddset(&action.sa_mask, SIGTERM);
292 sigaddset(&action.sa_mask, SIGUSR1);
293 sigaddset(&action.sa_mask, SIGINT);
295 sigaddset(&action.sa_mask, SIGUSR2);
297 action.sa_flags = SA_RESTART;
298 if ( sigaction( SIGHUP, &action, NULL ) < 0 ) {
299 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
300 afp_dsi_die(EXITERR_SYS);
303 /* install SIGTERM */
304 action.sa_handler = afp_dsi_die;
305 sigemptyset( &action.sa_mask );
306 sigaddset(&action.sa_mask, SIGALRM);
307 sigaddset(&action.sa_mask, SIGHUP);
308 sigaddset(&action.sa_mask, SIGUSR1);
309 sigaddset(&action.sa_mask, SIGINT);
311 sigaddset(&action.sa_mask, SIGUSR2);
313 action.sa_flags = SA_RESTART;
314 if ( sigaction( SIGTERM, &action, NULL ) < 0 ) {
315 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
316 afp_dsi_die(EXITERR_SYS);
320 /* Added for server message support */
321 action.sa_handler = afp_dsi_getmesg;
322 sigemptyset( &action.sa_mask );
323 sigaddset(&action.sa_mask, SIGALRM);
324 sigaddset(&action.sa_mask, SIGTERM);
325 sigaddset(&action.sa_mask, SIGUSR1);
326 sigaddset(&action.sa_mask, SIGHUP);
327 sigaddset(&action.sa_mask, SIGINT);
328 action.sa_flags = SA_RESTART;
329 if ( sigaction( SIGUSR2, &action, NULL) < 0 ) {
330 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
331 afp_dsi_die(EXITERR_SYS);
333 #endif /* SERVERTEXT */
335 /* SIGUSR1 - set down in 5 minutes */
336 action.sa_handler = afp_dsi_timedown;
337 sigemptyset( &action.sa_mask );
338 sigaddset(&action.sa_mask, SIGALRM);
339 sigaddset(&action.sa_mask, SIGHUP);
340 sigaddset(&action.sa_mask, SIGTERM);
341 sigaddset(&action.sa_mask, SIGINT);
343 sigaddset(&action.sa_mask, SIGUSR2);
345 action.sa_flags = SA_RESTART;
346 if ( sigaction( SIGUSR1, &action, NULL) < 0 ) {
347 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
348 afp_dsi_die(EXITERR_SYS);
351 /* SIGINT - enable max_debug LOGging to /tmp/afpd.PID.XXXXXX */
352 action.sa_handler = afp_dsi_debug;
353 sigfillset( &action.sa_mask );
354 action.sa_flags = SA_RESTART;
355 if ( sigaction( SIGINT, &action, NULL) < 0 ) {
356 LOG(log_error, logtype_afpd, "afp_over_dsi: sigaction: %s", strerror(errno) );
357 afp_dsi_die(EXITERR_SYS);
362 action.sa_handler = alarm_handler;
363 sigemptyset(&action.sa_mask);
364 sigaddset(&action.sa_mask, SIGHUP);
365 sigaddset(&action.sa_mask, SIGTERM);
366 sigaddset(&action.sa_mask, SIGUSR1);
367 sigaddset(&action.sa_mask, SIGINT);
369 sigaddset(&action.sa_mask, SIGUSR2);
371 action.sa_flags = SA_RESTART;
372 if ((sigaction(SIGALRM, &action, NULL) < 0) ||
373 (setitimer(ITIMER_REAL, &dsi->timer, NULL) < 0)) {
374 afp_dsi_die(EXITERR_SYS);
376 #endif /* DEBUGGING */
378 if (dircache_init(obj->options.dircachesize) != 0)
379 afp_dsi_die(EXITERR_SYS);
381 /* get stuck here until the end */
382 while ((cmd = dsi_receive(dsi))) {
384 child.flags &= ~CHILD_SLEEPING;
385 dsi_sleep(dsi, 0); /* wake up */
387 if (reload_request) {
389 load_volumes(child.obj);
394 /* The first SIGINT enables debugging, the next restores the config */
396 static int debugging = 0;
400 if (obj->options.logconfig)
401 setuplog(obj->options.logconfig);
403 setuplog("default log_note");
408 sprintf(logstr, "default log_maxdebug /tmp/afpd.%u.XXXXXX", getpid());
413 if (cmd == DSIFUNC_TICKLE) {
414 /* timer is not every 30 seconds anymore, so we don't get killed on the client side. */
415 if ((child.flags & CHILD_DIE))
417 pending_request(dsi);
421 child.flags |= CHILD_DATA;
425 LOG(log_info, logtype_afpd, "done");
432 if ( flushfork( writtenfork ) < 0 ) {
433 LOG(log_error, logtype_afpd, "main flushfork: %s", strerror(errno) );
439 function = (u_char) dsi->commands[0];
441 /* send off an afp command. in a couple cases, we take advantage
442 * of the fact that we're a stream-based protocol. */
443 if (afp_switch[function]) {
444 dsi->datalen = DSI_DATASIZ;
445 child.flags |= CHILD_RUNNING;
447 LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
449 err = (*afp_switch[function])(obj,
450 (char *)&dsi->commands, dsi->cmdlen,
451 (char *)&dsi->data, &dsi->datalen);
453 LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
454 AfpNum2name(function), AfpErr2name(err));
456 /* bring everything back to old euid, egid */
458 restore_uidgid ( &obj->uidgid );
459 #endif /* FORCE_UIDGID */
460 child.flags &= ~CHILD_RUNNING;
462 LOG(log_error, logtype_afpd, "bad function %X", function);
467 /* single shot toggle that gets set by dsi_readinit. */
473 if (!dsi_cmdreply(dsi, err)) {
474 LOG(log_error, logtype_afpd, "dsi_cmdreply(%d): %s", dsi->socket, strerror(errno) );
475 afp_dsi_die(EXITERR_CLNT);
479 case DSIFUNC_WRITE: /* FPWrite and FPAddIcon */
480 function = (u_char) dsi->commands[0];
481 if ( afp_switch[ function ] != NULL ) {
482 dsi->datalen = DSI_DATASIZ;
483 child.flags |= CHILD_RUNNING;
485 LOG(log_debug, logtype_afpd, "<== Start AFP command: %s", AfpNum2name(function));
487 err = (*afp_switch[function])(obj,
488 (char *)&dsi->commands, dsi->cmdlen,
489 (char *)&dsi->data, &dsi->datalen);
491 LOG(log_debug, logtype_afpd, "==> Finished AFP command: %s -> %s",
492 AfpNum2name(function), AfpErr2name(err));
494 child.flags &= ~CHILD_RUNNING;
496 /* bring everything back to old euid, egid */
498 restore_uidgid ( &obj->uidgid );
499 #endif /* FORCE_UIDGID */
501 LOG(log_error, logtype_afpd, "(write) bad function %x", function);
506 if (!dsi_wrtreply(dsi, err)) {
507 LOG(log_error, logtype_afpd, "dsi_wrtreply: %s", strerror(errno) );
508 afp_dsi_die(EXITERR_CLNT);
512 case DSIFUNC_ATTN: /* attention replies */
515 /* error. this usually implies a mismatch of some kind
516 * between server and client. if things are correct,
517 * we need to flush the rest of the packet if necessary. */
519 LOG(log_info, logtype_afpd,"afp_dsi: spurious command %d", cmd);
520 dsi_writeinit(dsi, dsi->data, DSI_DATASIZ);
524 pending_request(dsi);
528 afp_dsi_die(EXITERR_CLNT);