2 * $Id: cnid_metad.c,v 1.1.4.5 2003-11-18 12:32:46 didg Exp $
4 * Copyright (C) Joerg Lenneis 2003
5 * All Rights Reserved. See COPYRIGHT.
9 /* cnid_dbd metadaemon to start up cnid_dbd upon request from afpd */
13 #endif /* HAVE_CONFIG_H */
21 #endif /* HAVE_UNISTD_H */
22 #include <sys/param.h>
26 #ifdef HAVE_SYS_TYPES_H
27 #include <sys/types.h>
29 #ifdef HAVE_SYS_TIME_H
32 #ifdef HAVE_SYS_WAIT_H
40 #include <sys/socket.h>
45 #define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
46 #endif /* ! WEXITSTATUS */
48 #define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
49 #endif /* ! WIFEXITED */
51 #define WIFSTOPPED(status) (((status) & 0xff) == 0x7f)
55 #define WIFSIGNALED(status) (!WIFSTOPPED(status) && !WIFEXITED(status))
58 #define WTERMSIG(status) ((status) & 0x7f)
62 #define fork aTaC_fork
65 /* functions for username and group */
69 #include <atalk/logger.h>
70 #include <atalk/cnid_dbd_private.h>
75 #define DBHOME ".AppleDB"
83 #define MAXSPAWN 3 /* Max times respawned in.. */
84 #define TESTTIME 20 /* this much seconds */
89 time_t tm; /* When respawned last */
90 int count; /* Times respawned in the last TESTTIME secondes */
94 static struct server srv[MAXSRV +1];
96 static struct server *test_usockfn(char *dir, char *fn)
99 for (i = 1; i <= MAXSRV; i++) {
100 if (srv[i].name && !strcmp(srv[i].name, dir)) {
107 /* -------------------- */
108 static int send_cred(int socket, int fd)
113 struct cmsghdr *cmsgp = NULL;
114 char buf[CMSG_SPACE(sizeof fd)];
117 memset(&msgh,0,sizeof (msgh));
118 memset(buf,0,sizeof (buf));
120 msgh.msg_name = NULL;
121 msgh.msg_namelen = 0;
126 iov[0].iov_base = &er;
127 iov[0].iov_len = sizeof(er);
129 msgh.msg_control = buf;
130 msgh.msg_controllen = sizeof(buf);
132 cmsgp = CMSG_FIRSTHDR(&msgh);
133 cmsgp->cmsg_level = SOL_SOCKET;
134 cmsgp->cmsg_type = SCM_RIGHTS;
135 cmsgp->cmsg_len = CMSG_LEN(sizeof(fd));
137 *((int *)CMSG_DATA(cmsgp)) = fd;
138 msgh.msg_controllen = cmsgp->cmsg_len;
141 ret = sendmsg(socket,&msgh, 0);
142 } while ( ret == -1 && errno == EINTR );
144 LOG(log_error, logtype_cnid, "error in sendmsg: %s", strerror(errno));
150 /* -------------------- */
151 static int maybe_start_dbd(char *dbdpn, char *dbdir, char *usockfn)
158 up = test_usockfn(dbdir, usockfn);
160 /* we already have a process, send our fd */
161 if (send_cred(up->sv[0], rqstfd) < 0) {
170 /* find an empty slot */
171 for (i = 1; i <= MAXSRV; i++) {
172 if (!srv[i].pid && srv[i].tm + TESTTIME < t) {
178 up->name = strdup(dbdir);
183 LOG(log_error, logtype_cnid, "no free slot");
188 /* we have a slot but no process, check for respawn too fast */
189 if (up->tm + TESTTIME > t) {
195 if (up->count >= MAXSPAWN) {
197 LOG(log_error, logtype_cnid, "respawn too fast %s", up->name);
198 /* FIXME should we sleep a little ? */
203 /* create socketpair for comm between parent and child
204 * FIXME Do we really need a permanent pipe between them ?
206 if (socketpair(PF_UNIX, SOCK_STREAM, 0, up->sv) < 0) {
207 LOG(log_error, logtype_cnid, "error in fork: %s", strerror(errno));
211 if ((pid = fork()) < 0) {
212 LOG(log_error, logtype_cnid, "error in fork: %s", strerror(errno));
217 * Child. Close descriptors and start the daemon. If it fails
218 * just log it. The client process will fail connecting
230 if (execlp(dbdpn, dbdpn, dbdir, NULL) < 0) {
231 LOG(log_error, logtype_cnid, "Fatal error in exec: %s", strerror(errno));
242 /* ------------------ */
243 static int set_dbdir(char *dbdir, int len)
250 if (stat(dbdir, &st) < 0 && mkdir(dbdir, 0755) < 0) {
251 LOG(log_error, logtype_cnid, "set_dbdir: mkdir failed for %s", dbdir);
255 if (dbdir[len - 1] != '/') {
259 strcpy(dbdir + len, DBHOME);
260 if (stat(dbdir, &st) < 0 && mkdir(dbdir, 0755 ) < 0) {
261 LOG(log_error, logtype_cnid, "set_dbdir: mkdir failed for %s", dbdir);
267 /* ------------------ */
268 uid_t user_to_uid ( username )
271 struct passwd *this_passwd;
273 /* check for anything */
274 if ( !username || strlen ( username ) < 1 ) return 0;
276 /* grab the /etc/passwd record relating to username */
277 this_passwd = getpwnam ( username );
279 /* return false if there is no structure returned */
280 if (this_passwd == NULL) return 0;
282 /* return proper uid */
283 return this_passwd->pw_uid;
287 /* ------------------ */
288 gid_t group_to_gid ( group )
291 struct group *this_group;
293 /* check for anything */
294 if ( !group || strlen ( group ) < 1 ) return 0;
296 /* grab the /etc/groups record relating to group */
297 this_group = getgrnam ( group );
299 /* return false if there is no structure returned */
300 if (this_group == NULL) return 0;
302 /* return proper gid */
303 return this_group->gr_gid;
307 /* ------------------ */
308 int main(int argc, char *argv[])
310 char dbdir[MAXPATHLEN + 1];
317 struct db_param *dbp;
326 while (( cc = getopt( argc, argv, "ds:p:h:u:g:")) != -1 ) {
332 host = strdup(optarg);
335 uid = user_to_uid (optarg);
337 LOG(log_error, logtype_cnid, "main: bad user %s", optarg);
342 gid =group_to_gid (optarg);
344 LOG(log_error, logtype_cnid, "main: bad group %s", optarg);
352 dbdpn = strdup(optarg);
360 if (err || !host || !port || !dbdpn) {
361 LOG(log_error, logtype_cnid, "main: bad arguments");
376 if (( i = open( "/dev/tty", O_RDWR )) >= 0 ) {
377 (void)ioctl( i, TIOCNOTTY, 0 );
378 setpgid( 0, getpid());
383 setpgid( 0, getpid());
386 case -1 : /* error */
387 LOG(log_error, logtype_cnid, "detach from terminal: %s", strerror(errno));
389 default : /* server */
394 if ((srvfd = tsockfd_create(host, port, 10)) < 0)
399 LOG(log_info, logtype_cnid, "Setting uid/gid to %i/%i", uid, gid);
401 if (setresgid(gid,gid,gid) < 0 || setgid(gid) < 0) {
402 LOG(log_info, logtype_cnid, "unable to switch to group %d", gid);
407 if (setresuid(uid,uid,uid) < 0 || setuid(uid) < 0) {
408 LOG(log_info, logtype_cnid, "unable to switch to user %d", uid);
414 signal(SIGPIPE, SIG_IGN);
417 /* Collect zombie processes and log what happened to them */
418 while ((pid = waitpid(-1, &status, WNOHANG)) > 0) {
419 for (i = 1; i <= MAXSRV; i++) {
420 if (srv[i].pid == pid) {
430 if (WIFEXITED(status)) {
431 LOG(log_info, logtype_cnid, "cnid_dbd pid %i exited with exit code %i",
432 pid, WEXITSTATUS(status));
434 else if (WIFSIGNALED(status)) {
435 LOG(log_info, logtype_cnid, "cnid_dbd pid %i exited with signal %i",
436 pid, WTERMSIG(status));
441 if ((rqstfd = usockfd_check(srvfd, 10000000)) <= 0)
443 /* TODO: Check out read errors, broken pipe etc. in libatalk. Is
444 SIGIPE ignored there? Answer: Ignored for dsi, but not for asp ... */
445 ret = read(rqstfd, &len, sizeof(int));
451 LOG(log_error, logtype_cnid, "error read: %s", strerror(errno));
454 else if (ret != sizeof(int)) {
455 LOG(log_error, logtype_cnid, "short read: got %d", ret);
459 * checks for buffer overruns. The client libatalk side does it too
460 * before handing the dir path over but who trusts clients?
462 if (!len || len +DBHOMELEN +2 > MAXPATHLEN) {
463 LOG(log_error, logtype_cnid, "wrong len parameter: %d", len);
466 if (read(rqstfd, dbdir, len) != len) {
467 LOG(log_error, logtype_cnid, "error/short read (dir): %s", strerror(errno));
472 if (set_dbdir(dbdir, len) < 0) {
476 if ((dbp = db_param_read(dbdir)) == NULL) {
477 LOG(log_error, logtype_cnid, "Error reading config file");
480 maybe_start_dbd(dbdpn, dbdir, dbp->usock_file);