2 * Copyright (C) Joerg Lenneis 2003
3 * Copyright (C) Frank Lahm 2009, 2010
5 * All Rights Reserved. See COPYING.
9 cnid_dbd metadaemon to start up cnid_dbd upon request from afpd.
13 1. afpd -------> cnid_metad
15 via UNIX domain socket
16 2. cnid_metad -------> cnid_dbd
19 3. cnid_metad -------> cnid_dbd
23 4. afpd -------> cnid_dbd
25 cnid_metad and cnid_dbd have been converted to non-blocking IO in 2010.
31 #endif /* HAVE_CONFIG_H */
37 #include <sys/param.h>
41 #include <sys/types.h>
43 #include <sys/resource.h>
48 #include <sys/socket.h>
53 #define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
54 #endif /* ! WEXITSTATUS */
56 #define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
57 #endif /* ! WIFEXITED */
59 #define WIFSTOPPED(status) (((status) & 0xff) == 0x7f)
63 #define WIFSIGNALED(status) (!WIFSTOPPED(status) && !WIFEXITED(status))
66 #define WTERMSIG(status) ((status) & 0x7f)
69 /* functions for username and group */
76 #define USE_SETRESUID 1
77 #define SWITCH_TO_GID(gid) ((setresgid(gid,gid,gid) < 0 || setgid(gid) < 0) ? -1 : 0)
78 #define SWITCH_TO_UID(uid) ((setresuid(uid,uid,uid) < 0 || setuid(uid) < 0) ? -1 : 0)
79 #endif /* USE_SETRESUID */
83 #define SWITCH_TO_GID(gid) ((setegid(gid) < 0 || setgid(gid) < 0) ? -1 : 0)
84 #define SWITCH_TO_UID(uid) ((setuid(uid) < 0 || seteuid(uid) < 0 || setuid(uid) < 0) ? -1 : 0)
85 #endif /* USE_SETEUID */
88 #include <atalk/util.h>
89 #include <atalk/logger.h>
90 #include <atalk/cnid_bdb_private.h>
91 #include <atalk/paths.h>
92 #include <atalk/compat.h>
93 #include <atalk/errchk.h>
94 #include <atalk/bstrlib.h>
95 #include <atalk/bstradd.h>
96 #include <atalk/netatalk_conf.h>
97 #include <atalk/volume.h>
101 #define DBHOME ".AppleDB"
106 static volatile sig_atomic_t sigchild = 0;
109 #define MAXSPAWN 3 /* Max times respawned in.. */
110 #define TESTTIME 10 /* this much seconds apfd client tries to *
111 * to reconnect every 5 secondes, catch it */
113 #define DEFAULTHOST "localhost"
114 #define DEFAULTPORT "4700"
119 time_t tm; /* When respawned last */
120 unsigned int count; /* Times respawned in the last TESTTIME secondes */
121 int control_fd; /* file descriptor to child cnid_dbd process */
124 static struct server srv[MAXVOLS];
126 static void daemon_exit(int i)
131 /* ------------------ */
132 static void sig_handler(int sig)
137 LOG(log_note, logtype_afpd, "shutting down on %s",
138 sig == SIGTERM ? "SIGTERM" : "SIGQUIT");
141 LOG(log_error, logtype_afpd, "unexpected signal: %d", sig);
146 static struct server *test_usockfn(const char *path)
150 for (i = 0; i < maxvol; i++) {
151 if (srv[i].v_path && STRCMP(path, ==, srv[i].v_path))
158 /* -------------------- */
159 static int maybe_start_dbd(const AFPObj *obj, char *dbdpn, const char *volpath)
169 LOG(log_debug, logtype_cnid, "maybe_start_dbd(\"%s\"): BEGIN", volpath);
171 up = test_usockfn(volpath);
173 /* we already have a process, send our fd */
174 LOG(log_debug, logtype_cnid, "maybe_start_dbd: cnid_dbd[%d] already serving", up->pid);
175 if (send_fd(up->control_fd, rqstfd) < 0) {
182 LOG(log_debug, logtype_cnid, "maybe_start_dbd: no cnid_dbd serving yet");
186 /* find an empty slot (i < maxvol) or the first free slot (i == maxvol)*/
187 for (i = 0; i <= maxvol && i < MAXVOLS; i++) {
188 if (srv[i].v_path == NULL) {
190 if ((up->v_path = strdup(volpath)) == NULL)
200 LOG(log_error, logtype_cnid, "no free slot for cnid_dbd child. Configured maximum: %d. Do you have so many volumes?", MAXVOLS);
204 /* we have a slot but no process */
206 /* check for respawn too fast */
207 if (t < (up->tm + TESTTIME)) {
208 /* We're in the respawn time window */
209 if (up->count > MAXSPAWN) {
210 /* ...and already tried to fork too often */
211 LOG(log_maxdebug, logtype_cnid, "maybe_start_dbd: respawning too fast");
212 return -1; /* just exit, dont sleep, because we might have work to do for another client */
215 /* out of respawn too fast windows reset the count */
216 LOG(log_info, logtype_cnid, "maybe_start_dbd: respawn window ended");
222 LOG(log_maxdebug, logtype_cnid, "maybe_start_dbd: respawn count: %u", up->count);
223 if (up->count > MAXSPAWN) {
224 /* We spawned too fast. From now until the first time we tried + TESTTIME seconds
225 we will just return -1 above */
226 LOG(log_info, logtype_cnid, "maybe_start_dbd: reached MAXSPAWN threshhold");
231 Create socketpair for comm between parent and child.
232 We use it to pass fds from connecting afpd processes to our
233 cnid_dbd child via fd passing.
235 if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) < 0) {
236 LOG(log_error, logtype_cnid, "error in socketpair: %s", strerror(errno));
240 if ((pid = fork()) < 0) {
241 LOG(log_error, logtype_cnid, "error in fork: %s", strerror(errno));
247 * Child. Close descriptors and start the daemon. If it fails
248 * just log it. The client process will fail connecting
255 for (i = 0; i < MAXVOLS; i++) {
256 if (srv[i].pid && up != &srv[i]) {
257 close(srv[i].control_fd);
261 sprintf(buf1, "%i", sv[1]);
262 sprintf(buf2, "%i", rqstfd);
264 if (up->count == MAXSPAWN) {
265 /* there's a pb with the db inform child, it will delete the db */
266 LOG(log_warning, logtype_cnid,
267 "Multiple attempts to start CNID db daemon for \"%s\" failed, wiping the slate clean...",
269 ret = execlp(dbdpn, dbdpn, "-F", obj->options.configfile, "-p", volpath, "-t", buf1, "-l", buf2, "-d", NULL);
271 ret = execlp(dbdpn, dbdpn, "-F", obj->options.configfile, "-p", volpath, "-t", buf1, "-l", buf2, NULL);
273 /* Yikes! We're still here, so exec failed... */
274 LOG(log_error, logtype_cnid, "Fatal error in exec: %s", strerror(errno));
282 up->control_fd = sv[0];
286 /* ------------------ */
287 static int set_dbdir(const char *dbdir, const char *vpath)
291 bstring oldpath, newpath;
294 LOG(log_debug, logtype_cnid, "set_dbdir: volume: %s, db path: %s", vpath, dbdir);
296 EC_NULL_LOG( oldpath = bformat("%s/%s/", vpath, DBHOME) );
297 EC_NULL_LOG( newpath = bformat("%s/%s/", dbdir, DBHOME) );
299 if (lstat(dbdir, &st) < 0 && mkdir(dbdir, 0755) < 0) {
300 LOG(log_error, logtype_cnid, "set_dbdir: mkdir failed for %s", dbdir);
304 if (lstat(cfrombstr(oldpath), &st) == 0 && lstat(cfrombstr(newpath), &st) != 0 && errno == ENOENT) {
305 /* There's an .AppleDB in the volume root, we move it */
307 cmd_argv[1] = bdata(oldpath);
308 cmd_argv[2] = (char *)dbdir;
310 if (run_cmd("mv", cmd_argv) != 0) {
311 LOG(log_error, logtype_cnid, "set_dbdir: moving CNID db from \"%s\" to \"%s\" failed",
312 bdata(oldpath), dbdir);
318 if (lstat(cfrombstr(newpath), &st) < 0 && mkdir(cfrombstr(newpath), 0755 ) < 0) {
319 LOG(log_error, logtype_cnid, "set_dbdir: mkdir failed for %s", bdata(newpath));
329 /* ------------------ */
330 static void catch_child(int sig _U_)
335 /* ----------------------- */
336 static void set_signal(void)
341 memset(&sv, 0, sizeof(sv));
344 sv.sa_handler = catch_child;
345 sv.sa_flags = SA_NOCLDSTOP;
346 sigemptyset(&sv.sa_mask);
347 if (sigaction(SIGCHLD, &sv, NULL) < 0) {
348 LOG(log_error, logtype_cnid, "cnid_metad: sigaction: %s", strerror(errno));
349 daemon_exit(EXITERR_SYS);
352 /* Catch SIGTERM and SIGQUIT */
353 sv.sa_handler = sig_handler;
354 sigfillset(&sv.sa_mask );
355 if (sigaction(SIGTERM, &sv, NULL ) < 0 ) {
356 LOG(log_error, logtype_afpd, "sigaction: %s", strerror(errno) );
357 daemon_exit(EXITERR_SYS);
359 if (sigaction(SIGQUIT, &sv, NULL ) < 0 ) {
360 LOG(log_error, logtype_afpd, "sigaction: %s", strerror(errno) );
361 daemon_exit(EXITERR_SYS);
364 /* Ignore the rest */
365 sv.sa_handler = SIG_IGN;
366 sigemptyset(&sv.sa_mask );
367 if (sigaction(SIGALRM, &sv, NULL ) < 0 ) {
368 LOG(log_error, logtype_afpd, "sigaction: %s", strerror(errno) );
369 daemon_exit(EXITERR_SYS);
371 sv.sa_handler = SIG_IGN;
372 sigemptyset(&sv.sa_mask );
373 if (sigaction(SIGHUP, &sv, NULL ) < 0 ) {
374 LOG(log_error, logtype_afpd, "sigaction: %s", strerror(errno) );
375 daemon_exit(EXITERR_SYS);
377 sv.sa_handler = SIG_IGN;
378 sigemptyset(&sv.sa_mask );
379 if (sigaction(SIGUSR1, &sv, NULL ) < 0 ) {
380 LOG(log_error, logtype_afpd, "sigaction: %s", strerror(errno) );
381 daemon_exit(EXITERR_SYS);
383 sv.sa_handler = SIG_IGN;
384 sigemptyset(&sv.sa_mask );
385 if (sigaction(SIGUSR2, &sv, NULL ) < 0 ) {
386 LOG(log_error, logtype_afpd, "sigaction: %s", strerror(errno) );
387 daemon_exit(EXITERR_SYS);
389 sv.sa_handler = SIG_IGN;
390 sigemptyset(&sv.sa_mask );
391 if (sigaction(SIGPIPE, &sv, NULL ) < 0 ) {
392 LOG(log_error, logtype_afpd, "sigaction: %s", strerror(errno) );
393 daemon_exit(EXITERR_SYS);
396 /* block everywhere but in pselect */
398 sigaddset(&set, SIGCHLD);
399 sigprocmask(SIG_SETMASK, &set, NULL);
402 static int setlimits(void)
406 if (getrlimit(RLIMIT_NOFILE, &rlim) != 0) {
407 LOG(log_error, logtype_afpd, "setlimits: %s", strerror(errno));
410 if (rlim.rlim_cur != RLIM_INFINITY && rlim.rlim_cur < 65535) {
411 rlim.rlim_cur = 65535;
412 if (rlim.rlim_max != RLIM_INFINITY && rlim.rlim_max < 65535)
413 rlim.rlim_max = 65535;
414 if (setrlimit(RLIMIT_NOFILE, &rlim) != 0) {
415 LOG(log_error, logtype_afpd, "setlimits: %s", strerror(errno));
422 /* ------------------ */
423 int main(int argc, char *argv[])
425 char volpath[MAXPATHLEN + 1];
429 char *dbdpn = _PATH_CNID_DBD;
442 while (( cc = getopt( argc, argv, "dF:vV")) != -1 ) {
448 obj.cmdlineconfigfile = strdup(optarg);
452 printf("cnid_metad (Netatalk %s)\n", VERSION);
455 printf("cnid_metad [-dvV] [-F alternate configfile ]\n");
460 if (!debug && daemonize(0, 0) != 0)
463 if (afp_config_parse(&obj, "cnid_metad") != 0)
466 if (load_volumes(&obj, lv_all) != 0)
471 host = atalk_iniparser_getstrdup(obj.iniconfig, INISEC_GLOBAL, "cnid listen", "localhost:4700");
472 if ((port = strrchr(host, ':')))
476 if ((srvfd = tsockfd_create(host, port, 10)) < 0)
479 LOG(log_note, logtype_afpd, "CNID Server listening on %s:%s", host, port);
483 LOG(log_debug, logtype_cnid, "Setting uid/gid to %i/%i", uid, gid);
485 if (SWITCH_TO_GID(gid) < 0) {
486 LOG(log_info, logtype_cnid, "unable to switch to group %d", gid);
491 if (SWITCH_TO_UID(uid) < 0) {
492 LOG(log_info, logtype_cnid, "unable to switch to user %d", uid);
501 sigprocmask(SIG_SETMASK, NULL, &set);
502 sigdelset(&set, SIGCHLD);
505 rqstfd = usockfd_check(srvfd, &set);
506 /* Collect zombie processes and log what happened to them */
507 if (sigchild) while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
508 for (i = 0; i < maxvol; i++) {
509 if (srv[i].pid == pid) {
511 close(srv[i].control_fd);
515 if (WIFEXITED(status)) {
516 LOG(log_info, logtype_cnid, "cnid_dbd[%i] exited with exit code %i",
517 pid, WEXITSTATUS(status));
519 /* cnid_dbd did a clean exit probably on idle timeout, reset bookkeeping */
523 if (WIFSIGNALED(status)) {
524 LOG(log_info, logtype_cnid, "cnid_dbd[%i] got signal %i",
525 pid, WTERMSIG(status));
532 ret = readt(rqstfd, &len, sizeof(int), 1, 4);
539 LOG(log_severe, logtype_cnid, "error read: %s", strerror(errno));
542 else if (ret != sizeof(int)) {
543 LOG(log_error, logtype_cnid, "short read: got %d", ret);
547 * checks for buffer overruns. The client libatalk side does it too
548 * before handing the dir path over but who trusts clients?
550 if (!len || len +DBHOMELEN +2 > MAXPATHLEN) {
551 LOG(log_error, logtype_cnid, "wrong len parameter: %d", len);
555 actual_len = readt(rqstfd, volpath, len, 1, 5);
556 if (actual_len < 0) {
557 LOG(log_severe, logtype_cnid, "Read(2) error : %s", strerror(errno));
560 if (actual_len != len) {
561 LOG(log_error, logtype_cnid, "error/short read (dir): %s", strerror(errno));
566 LOG(log_debug, logtype_cnid, "main: request for volume: %s", volpath);
568 if (load_volumes(&obj, lv_all) != 0) {
569 LOG(log_severe, logtype_cnid, "main: error reloading config");
573 if ((vol = getvolbypath(&obj, volpath)) == NULL) {
574 LOG(log_severe, logtype_cnid, "main: no volume for path \"%s\"", volpath);
578 LOG(log_maxdebug, logtype_cnid, "main: dbpath: %s", vol->v_dbpath);
580 if (set_dbdir(vol->v_dbpath, volpath) < 0) {
584 maybe_start_dbd(&obj, dbdpn, vol->v_path);