2 * Copyright (c) 1990,1993 Regents of The University of Michigan.
3 * All Rights Reserved. See COPYRIGHT.
8 #endif /* HAVE_CONFIG_H */
14 #include <sys/param.h>
17 #include <sys/socket.h>
21 #include <sys/resource.h>
23 #include <atalk/logger.h>
24 #include <atalk/adouble.h>
25 #include <atalk/compat.h>
26 #include <atalk/dsi.h>
27 #include <atalk/afp.h>
28 #include <atalk/paths.h>
29 #include <atalk/util.h>
30 #include <atalk/server_child.h>
31 #include <atalk/server_ipc.h>
32 #include <atalk/errchk.h>
33 #include <atalk/globals.h>
34 #include <atalk/netatalk_conf.h>
36 #include "afp_config.h"
40 #include "afp_zeroconf.h"
42 #define AFP_LISTENERS 32
43 #define FDSET_SAFETY 5
45 unsigned char nologin = 0;
48 static server_child *server_children;
49 static sig_atomic_t reloadconfig = 0;
50 static sig_atomic_t gotsigchld = 0;
52 /* Two pointers to dynamic allocated arrays which store pollfds and associated data */
53 static struct pollfd *fdset;
54 static struct polldata *polldata;
55 static int fdset_size; /* current allocated size */
56 static int fdset_used; /* number of used elements */
57 static int disasociated_ipc_fd; /* disasociated sessions uses this fd for IPC */
59 static afp_child_t *dsi_start(AFPObj *obj, DSI *dsi, server_child *server_children);
61 static void afp_exit(int ret)
68 initialize fd set we are waiting for.
70 static void fd_set_listening_sockets(const AFPObj *config)
74 for (dsi = config->dsi; dsi; dsi = dsi->next) {
75 fdset_add_fd(config->options.connections + AFP_LISTENERS + FDSET_SAFETY,
85 if (config->options.flags & OPTION_KEEPSESSIONS)
86 fdset_add_fd(config->options.connections + AFP_LISTENERS + FDSET_SAFETY,
96 static void fd_reset_listening_sockets(const AFPObj *config)
100 for (dsi = config->dsi; dsi; dsi = dsi->next) {
101 fdset_del_fd(&fdset, &polldata, &fdset_used, &fdset_size, dsi->serversock);
104 if (config->options.flags & OPTION_KEEPSESSIONS)
105 fdset_del_fd(&fdset, &polldata, &fdset_used, &fdset_size, disasociated_ipc_fd);
108 /* ------------------ */
109 static void afp_goaway(int sig)
117 LOG(log_note, logtype_afpd, "AFP Server shutting down on SIGTERM");
120 if (obj.options.flags & OPTION_KEEPSESSIONS) {
121 LOG(log_note, logtype_afpd, "AFP Server shutting down on SIGQUIT, NOT disconnecting clients");
123 LOG(log_note, logtype_afpd, "AFP Server shutting down on SIGQUIT");
129 server_child_kill(server_children, CHILD_DSIFORK, sig);
137 LOG(log_info, logtype_afpd, "disallowing logins");
140 server_child_kill(server_children, CHILD_DSIFORK, sig);
144 /* w/ a configuration file, we can force a re-read if we want */
149 /* w/ a configuration file, we can force a re-read if we want */
154 LOG(log_error, logtype_afpd, "afp_goaway: bad signal" );
159 static void child_handler(void)
166 #define WAIT_ANY (-1)
167 #endif /* ! WAIT_ANY */
169 while ((pid = waitpid(WAIT_ANY, &status, WNOHANG)) > 0) {
170 for (i = 0; i < server_children->nforks; i++) {
171 if ((fd = server_child_remove(server_children, i, pid)) != -1) {
172 fdset_del_fd(&fdset, &polldata, &fdset_used, &fdset_size, fd);
177 if (WIFEXITED(status)) {
178 if (WEXITSTATUS(status))
179 LOG(log_info, logtype_afpd, "child[%d]: exited %d", pid, WEXITSTATUS(status));
181 LOG(log_info, logtype_afpd, "child[%d]: done", pid);
183 if (WIFSIGNALED(status))
184 LOG(log_info, logtype_afpd, "child[%d]: killed by signal %d", pid, WTERMSIG(status));
186 LOG(log_info, logtype_afpd, "child[%d]: died", pid);
191 static int setlimits(void)
195 if (getrlimit(RLIMIT_NOFILE, &rlim) != 0) {
196 LOG(log_warning, logtype_afpd, "setlimits: reading current limits failed: %s", strerror(errno));
199 if (rlim.rlim_cur != RLIM_INFINITY && rlim.rlim_cur < 65535) {
200 rlim.rlim_cur = 65535;
201 if (rlim.rlim_max != RLIM_INFINITY && rlim.rlim_max < 65535)
202 rlim.rlim_max = 65535;
203 if (setrlimit(RLIMIT_NOFILE, &rlim) != 0) {
204 LOG(log_warning, logtype_afpd, "setlimits: increasing limits failed: %s", strerror(errno));
211 int main(int ac, char **av)
219 /* Parse argv args and initialize default options */
220 afp_options_parse_cmdline(&obj, ac, av);
222 if (!(obj.cmdlineflags & OPTION_DEBUG) && (daemonize(0, 0) != 0))
225 /* Log SIGBUS/SIGSEGV SBT */
228 if (afp_config_parse(&obj, "afpd") != 0)
229 afp_exit(EXITERR_CONF);
231 /* Save the user's current umask */
232 obj.options.save_mask = umask(obj.options.umask);
234 /* install child handler for asp and dsi. we do this before afp_goaway
235 * as afp_goaway references stuff from here.
236 * XXX: this should really be setup after the initial connections. */
237 if (!(server_children = server_child_alloc(obj.options.connections, CHILD_NFORKS))) {
238 LOG(log_error, logtype_afpd, "main: server_child alloc: %s", strerror(errno) );
239 afp_exit(EXITERR_SYS);
243 pthread_sigmask(SIG_SETMASK, &sigs, NULL);
245 memset(&sv, 0, sizeof(sv));
246 /* linux at least up to 2.4.22 send a SIGXFZ for vfat fs,
247 even if the file is open with O_LARGEFILE ! */
249 sv.sa_handler = SIG_IGN;
250 sigemptyset( &sv.sa_mask );
251 if (sigaction(SIGXFSZ, &sv, NULL ) < 0 ) {
252 LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
253 afp_exit(EXITERR_SYS);
257 sv.sa_handler = afp_goaway; /* handler for all sigs */
259 sigemptyset( &sv.sa_mask );
260 sigaddset(&sv.sa_mask, SIGALRM);
261 sigaddset(&sv.sa_mask, SIGHUP);
262 sigaddset(&sv.sa_mask, SIGTERM);
263 sigaddset(&sv.sa_mask, SIGUSR1);
264 sigaddset(&sv.sa_mask, SIGQUIT);
265 sv.sa_flags = SA_RESTART;
266 if ( sigaction( SIGCHLD, &sv, NULL ) < 0 ) {
267 LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
268 afp_exit(EXITERR_SYS);
271 sigemptyset( &sv.sa_mask );
272 sigaddset(&sv.sa_mask, SIGALRM);
273 sigaddset(&sv.sa_mask, SIGTERM);
274 sigaddset(&sv.sa_mask, SIGHUP);
275 sigaddset(&sv.sa_mask, SIGCHLD);
276 sigaddset(&sv.sa_mask, SIGQUIT);
277 sv.sa_flags = SA_RESTART;
278 if ( sigaction( SIGUSR1, &sv, NULL ) < 0 ) {
279 LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
280 afp_exit(EXITERR_SYS);
283 sigemptyset( &sv.sa_mask );
284 sigaddset(&sv.sa_mask, SIGALRM);
285 sigaddset(&sv.sa_mask, SIGTERM);
286 sigaddset(&sv.sa_mask, SIGUSR1);
287 sigaddset(&sv.sa_mask, SIGCHLD);
288 sigaddset(&sv.sa_mask, SIGQUIT);
289 sv.sa_flags = SA_RESTART;
290 if ( sigaction( SIGHUP, &sv, NULL ) < 0 ) {
291 LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
292 afp_exit(EXITERR_SYS);
295 sigemptyset( &sv.sa_mask );
296 sigaddset(&sv.sa_mask, SIGALRM);
297 sigaddset(&sv.sa_mask, SIGHUP);
298 sigaddset(&sv.sa_mask, SIGUSR1);
299 sigaddset(&sv.sa_mask, SIGCHLD);
300 sigaddset(&sv.sa_mask, SIGQUIT);
301 sv.sa_flags = SA_RESTART;
302 if ( sigaction( SIGTERM, &sv, NULL ) < 0 ) {
303 LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
304 afp_exit(EXITERR_SYS);
307 sigemptyset( &sv.sa_mask );
308 sigaddset(&sv.sa_mask, SIGALRM);
309 sigaddset(&sv.sa_mask, SIGHUP);
310 sigaddset(&sv.sa_mask, SIGUSR1);
311 sigaddset(&sv.sa_mask, SIGCHLD);
312 sigaddset(&sv.sa_mask, SIGTERM);
313 sv.sa_flags = SA_RESTART;
314 if (sigaction(SIGQUIT, &sv, NULL ) < 0 ) {
315 LOG(log_error, logtype_afpd, "main: sigaction: %s", strerror(errno) );
316 afp_exit(EXITERR_SYS);
319 /* afp.conf: not in config file: lockfile, configfile
320 * preference: command-line provides defaults.
321 * config file over-writes defaults.
323 * we also need to make sure that killing afpd during startup
324 * won't leave any lingering registered names around.
328 sigaddset(&sigs, SIGALRM);
329 sigaddset(&sigs, SIGHUP);
330 sigaddset(&sigs, SIGUSR1);
332 /* don't block SIGTERM */
333 sigaddset(&sigs, SIGTERM);
335 sigaddset(&sigs, SIGCHLD);
337 pthread_sigmask(SIG_BLOCK, &sigs, NULL);
338 if (configinit(&obj) != 0) {
339 LOG(log_error, logtype_afpd, "main: no servers configured");
340 afp_exit(EXITERR_CONF);
342 pthread_sigmask(SIG_UNBLOCK, &sigs, NULL);
347 /* watch atp, dsi sockets and ipc parent/child file descriptor. */
349 if (obj.options.flags & OPTION_KEEPSESSIONS) {
350 LOG(log_note, logtype_afpd, "Activating continous service");
351 disasociated_ipc_fd = ipc_server_uds(_PATH_AFP_IPC);
354 fd_set_listening_sockets(&obj);
364 /* wait for an appleshare connection. parent remains in the loop
365 * while the children get handled by afp_over_{asp,dsi}. this is
366 * currently vulnerable to a denial-of-service attack if a
367 * connection is made without an actual login attempt being made
368 * afterwards. establishing timeouts for logins is a possible
371 LOG(log_maxdebug, logtype_afpd, "main: polling %i fds", fdset_used);
372 pthread_sigmask(SIG_UNBLOCK, &sigs, NULL);
373 ret = poll(fdset, fdset_used, -1);
374 pthread_sigmask(SIG_BLOCK, &sigs, NULL);
386 fd_reset_listening_sockets(&obj);
388 LOG(log_info, logtype_afpd, "re-reading configuration file");
390 configfree(&obj, NULL);
391 if (configinit(&obj) != 0) {
392 LOG(log_error, logtype_afpd, "config re-read: no servers configured");
393 afp_exit(EXITERR_CONF);
396 fd_set_listening_sockets(&obj);
410 LOG(log_error, logtype_afpd, "main: can't wait for input: %s", strerror(errno));
414 for (int i = 0; i < fdset_used; i++) {
415 if (fdset[i].revents & (POLLIN | POLLERR | POLLHUP | POLLNVAL)) {
416 switch (polldata[i].fdtype) {
419 if (child = dsi_start(&obj, (DSI *)polldata[i].data, server_children)) {
420 /* Add IPC fd to select fd set */
421 fdset_add_fd(obj.options.connections + AFP_LISTENERS + FDSET_SAFETY,
433 child = (afp_child_t *)polldata[i].data;
434 LOG(log_debug, logtype_afpd, "main: IPC request from child[%u]", child->pid);
436 if (ipc_server_read(server_children, child->ipc_fd) != 0) {
437 fdset_del_fd(&fdset, &polldata, &fdset_used, &fdset_size, child->ipc_fd);
438 close(child->ipc_fd);
440 if ((obj.options.flags & OPTION_KEEPSESSIONS) && child->disasociated) {
441 LOG(log_note, logtype_afpd, "main: removing reattached child[%u]", child->pid);
442 server_child_remove(server_children, CHILD_DSIFORK, child->pid);
447 case DISASOCIATED_IPC_FD:
448 LOG(log_debug, logtype_afpd, "main: IPC reconnect request");
449 if ((recon_ipc_fd = accept(disasociated_ipc_fd, NULL, NULL)) == -1) {
450 LOG(log_error, logtype_afpd, "main: accept: %s", strerror(errno));
453 if (readt(recon_ipc_fd, &pid, sizeof(pid_t), 0, 1) != sizeof(pid_t)) {
454 LOG(log_error, logtype_afpd, "main: readt: %s", strerror(errno));
458 LOG(log_note, logtype_afpd, "main: IPC reconnect from pid [%u]", pid);
460 if ((child = server_child_add(server_children, CHILD_DSIFORK, pid, recon_ipc_fd)) == NULL) {
461 LOG(log_error, logtype_afpd, "main: server_child_add");
465 child->disasociated = 1;
466 fdset_add_fd(obj.options.connections + AFP_LISTENERS + FDSET_SAFETY,
477 LOG(log_debug, logtype_afpd, "main: IPC request for unknown type");
487 static afp_child_t *dsi_start(AFPObj *obj, DSI *dsi, server_child *server_children)
489 afp_child_t *child = NULL;
491 if (dsi_getsession(dsi, server_children, obj->options.tickleval, &child) != 0) {
492 LOG(log_error, logtype_afpd, "dsi_start: session error: %s", strerror(errno));
498 configfree(obj, dsi);
499 afp_over_dsi(obj); /* start a session */