X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fstatd%2Fstatd.c;h=157de853bf5aa4fbab1d6cc655f40beb6b806bca;hp=127e2580516d461d3a6fe0eeeed5ab4b1e227561;hb=3482b1145c2c9a39f1dcaabc32e36eb234b91447;hpb=955d48dbcf0c75f263f2573c998acc65f95ededa diff --git a/utils/statd/statd.c b/utils/statd/statd.c index 127e258..157de85 100644 --- a/utils/statd/statd.c +++ b/utils/statd/statd.c @@ -7,18 +7,27 @@ * NSM for Linux. */ -#include "config.h" +#ifdef HAVE_CONFIG_H +#include +#endif + +#include #include #include #include #include +#include #include #include #include #include #include +#include +#include +#include #include "statd.h" #include "version.h" +#include "nfslib.h" /* Socket operations */ #include @@ -36,14 +45,18 @@ char * SM_STAT_PATH = DEFAULT_SM_STAT_PATH; /* ----- end of state directory path stuff ------- */ -short int restart = 0; int run_mode = 0; /* foreground logging mode */ /* LH - I had these local to main, but it seemed silly to have * two copies of each - one in main(), one static in log.c... * It also eliminates the 256-char static in log.c */ char *name_p = NULL; -char *version_p = NULL; +const char *version_p = NULL; + +/* PRC: a high-availability callout program can be specified with -H + * When this is done, the program will receive callouts whenever clients + * are added or deleted to the notify list */ +char *ha_callout_prog = NULL; static struct option longopts[] = { @@ -56,11 +69,13 @@ static struct option longopts[] = { "name", 1, 0, 'n' }, { "state-directory-path", 1, 0, 'P' }, { "notify-mode", 0, 0, 'N' }, + { "ha-callout", 1, 0, 'H' }, + { "no-notify", 0, 0, 'L' }, { NULL, 0, 0, 0 } }; extern void sm_prog_1 (struct svc_req *, register SVCXPRT *); -extern int statd_get_socket(int port); +extern int statd_get_socket(void); #ifdef SIMULATIONS extern void simulator (int, char **); @@ -92,13 +107,21 @@ sm_prog_1_wrapper (struct svc_req *rqstp, register SVCXPRT *transp) static void killer (int sig) { - log (L_FATAL, "Caught signal %d, un-registering and exiting.", sig); - if (!(run_mode & MODE_NOTIFY_ONLY)) - pmap_unset (SM_PROG, SM_VERS); + note (N_FATAL, "Caught signal %d, un-registering and exiting.", sig); + pmap_unset (SM_PROG, SM_VERS); exit (0); } +static void +sigusr (int sig) +{ + extern void my_svc_exit (void); + dprintf (N_DEBUG, "Caught signal %d, re-notifying (state %d).", sig, + MY_STATE); + my_svc_exit(); +} + /* * Startup information. */ @@ -116,16 +139,7 @@ static void log_modes(void) if (run_mode & MODE_LOG_STDERR) strcat(buf,"Log-STDERR "); - if (run_mode & MODE_NOTIFY_ONLY) - { - strcat(buf,"Notify-Only "); - } - log(L_WARNING,buf); - /* future: IP aliasing - if (run_mode & MODE_NOTIFY_ONLY) - { - dprintf(L_DEBUG,"Notify IP: %s",svr_addr); - } */ + note(N_WARNING,buf); } /* @@ -145,8 +159,88 @@ usage() fprintf(stderr," -n, --name Specify a local hostname.\n"); fprintf(stderr," -P State directory path.\n"); fprintf(stderr," -N Run in notify only mode.\n"); + fprintf(stderr," -L, --no-notify Do not perform any notification.\n"); + fprintf(stderr," -H Specify a high-availability callout program.\n"); +} + +static const char *pidfile = "/var/run/rpc.statd.pid"; + +int pidfd = -1; +static void create_pidfile(void) +{ + FILE *fp; + + unlink(pidfile); + fp = fopen(pidfile, "w"); + if (!fp) + die("Opening %s failed: %s\n", + pidfile, strerror(errno)); + fprintf(fp, "%d\n", getpid()); + pidfd = dup(fileno(fp)); + if (fclose(fp) < 0) + note(N_WARNING, "Flushing pid file failed.\n"); +} + +static void truncate_pidfile(void) +{ + if (pidfd >= 0) + ftruncate(pidfd, 0); +} + +static void drop_privs(void) +{ + struct stat st; + + if (stat(SM_DIR, &st) == -1 && + stat(DIR_BASE, &st) == -1) { + st.st_uid = 0; + st.st_gid = 0; + } + + if (st.st_uid == 0) { + note(N_WARNING, "statd running as root. chown %s to choose different user\n", + SM_DIR); + return; + } + /* better chown the pid file before dropping, as if it + * if over nfs we might loose access + */ + if (pidfd >= 0) + fchown(pidfd, st.st_uid, st.st_gid); + + setgroups(0, NULL); + if (setgid(st.st_gid) == -1 + || setuid(st.st_uid) == -1) { + note(N_ERROR, "Fail to drop privileges"); + exit(1); + } } +static void run_sm_notify(int outport) +{ + char op[20]; + char *av[6]; + int ac = 0; + + av[ac++] = "/usr/sbin/sm-notify"; + if (run_mode & MODE_NODAEMON) + av[ac++] = "-d"; + if (outport) { + sprintf(op, "-p%d", outport); + av[ac++] = op; + } + if (run_mode & STATIC_HOSTNAME) { + av[ac++] = "-N"; + av[ac++] = MY_NAME; + } + av[ac] = NULL; + fprintf(stderr, "%s: -N deprecated, consider using /usr/sbin/sm-notify directly\n", + name_p); + execv(av[0], av); + fprintf(stderr, "%s: failed to run %s\n", name_p, av[0]); + exit(2); + +} /* * Entry routine/main loop. */ @@ -156,6 +250,11 @@ int main (int argc, char **argv) int pid; int arg; int port = 0, out_port = 0; + struct rlimit rlim; + int once = 1; + + int pipefds[2] = { -1, -1}; + char status; /* Default: daemon mode, no other options */ run_mode = 0; @@ -178,7 +277,7 @@ int main (int argc, char **argv) MY_NAME = NULL; /* Process command line switches */ - while ((arg = getopt_long(argc, argv, "h?vVFNdn:p:o:P:", longopts, NULL)) != EOF) { + while ((arg = getopt_long(argc, argv, "h?vVFNH:dn:p:o:P:L", longopts, NULL)) != EOF) { switch (arg) { case 'V': /* Version */ case 'v': @@ -190,6 +289,9 @@ int main (int argc, char **argv) case 'N': run_mode |= MODE_NOTIFY_ONLY; break; + case 'L': /* Listen only */ + run_mode |= MODE_NO_NOTIFY; + break; case 'd': /* No daemon only - log to stderr */ run_mode |= MODE_LOG_STDERR; break; @@ -212,6 +314,7 @@ int main (int argc, char **argv) } break; case 'n': /* Specify local hostname */ + run_mode |= STATIC_HOSTNAME; MY_NAME = xstrdup(optarg); break; case 'P': @@ -244,6 +347,13 @@ int main (int argc, char **argv) sprintf(SM_STAT_PATH, "%s/state", DIR_BASE ); } break; + case 'H': /* PRC: specify the ha-callout program */ + if ((ha_callout_prog = xstrdup(optarg)) == NULL) { + fprintf(stderr, "%s: xstrdup(%s) failed!\n", + argv[0], optarg); + exit(1); + } + break; case '?': /* heeeeeelllllllpppp? heh */ case 'h': usage(); @@ -259,14 +369,29 @@ int main (int argc, char **argv) exit(-1); } + if (run_mode & MODE_NOTIFY_ONLY) + run_sm_notify(out_port); + + if (!(run_mode & MODE_NODAEMON)) { run_mode &= ~MODE_LOG_STDERR; /* Never log to console in daemon mode. */ } - log_init (name_p,version_p); - - log_modes(); + if (getrlimit (RLIMIT_NOFILE, &rlim) != 0) + fprintf(stderr, "%s: getrlimit (RLIMIT_NOFILE) failed: %s\n", + argv [0], strerror(errno)); + else { + /* glibc sunrpc code dies if getdtablesize > FD_SETSIZE */ + if (rlim.rlim_cur > FD_SETSIZE) { + rlim.rlim_cur = FD_SETSIZE; + + if (setrlimit (RLIMIT_NOFILE, &rlim) != 0) { + fprintf(stderr, "%s: setrlimit (RLIMIT_NOFILE) failed: %s\n", + argv [0], strerror(errno)); + } + } + } #ifdef SIMULATIONS if (argc > 1) @@ -275,66 +400,123 @@ int main (int argc, char **argv) #endif if (!(run_mode & MODE_NODAEMON)) { - int filedes, fdmax, tempfd; + int tempfd; + if (pipe(pipefds)<0) { + perror("statd: unable to create pipe"); + exit(1); + } if ((pid = fork ()) < 0) { - perror ("Could not fork"); + perror ("statd: Could not fork"); exit (1); } else if (pid != 0) { - /* Parent. */ + /* Parent. + * Wait for status from child. + */ + close(pipefds[1]); + if (read(pipefds[0], &status, 1) != 1) + exit(1); exit (0); } /* Child. */ + close(pipefds[0]); setsid (); - chdir (DIR_BASE); + if (chdir (DIR_BASE) == -1) { + perror("statd: Could not chdir"); + exit(1); + } - tempfd = open("/dev/null", O_RDWR); - close(0); dup2(tempfd, 0); - close(1); dup2(tempfd, 1); - close(2); dup2(tempfd, 2); - fdmax = sysconf (_SC_OPEN_MAX); - for (filedes = 3; filedes < fdmax; filedes++) { - close (filedes); + while (pipefds[1] <= 2) { + pipefds[1] = dup(pipefds[1]); + if (pipefds[1]<0) { + perror("statd: dup"); + exit(1); + } } + tempfd = open("/dev/null", O_RDWR); + dup2(tempfd, 0); + dup2(tempfd, 1); + dup2(tempfd, 2); + dup2(pipefds[1], 3); + pipefds[1] = 3; + closeall(4); } /* Child. */ + + log_init (name_p,version_p); + + log_modes(); + signal (SIGHUP, killer); signal (SIGINT, killer); signal (SIGTERM, killer); + /* PRC: trap SIGUSR1 to re-read notify list from disk */ + signal(SIGUSR1, sigusr); /* WARNING: the following works on Linux and SysV, but not BSD! */ signal(SIGCHLD, SIG_IGN); + /* + * Ignore SIGPIPE to avoid statd dying when peers close their + * TCP connection while we're trying to reply to them. + */ + signal(SIGPIPE, SIG_IGN); + + create_pidfile(); + atexit(truncate_pidfile); + + if (! (run_mode & MODE_NO_NOTIFY)) + switch (pid = fork()) { + case 0: + run_sm_notify(out_port); + break; + case -1: + break; + default: + waitpid(pid, NULL, 0); + } - /* initialize out_port */ - statd_get_socket(out_port); for (;;) { - if (!(run_mode & MODE_NOTIFY_ONLY)) { - /* Do not do pmap_unset() when running in notify mode. - * We may clear the portmapper record for a statd not - * running in notify mode disabling it. - * Juan C. Gomez j_carlos_gomez@yahoo.com - */ - pmap_unset (SM_PROG, SM_VERS); + pmap_unset (SM_PROG, SM_VERS); + + /* If we got this far, we have successfully started, so notify parent */ + if (pipefds[1] > 0) { + status = 0; + write(pipefds[1], &status, 1); + close(pipefds[1]); + pipefds[1] = -1; } - change_state (); - shuffle_dirs (); /* Move directory names around */ - notify_hosts (); /* Send out notify requests */ - ++restart; /* this registers both UDP and TCP services */ - if (!(run_mode & MODE_NOTIFY_ONLY)) { - rpc_init("statd", SM_PROG, SM_VERS, sm_prog_1, port); - } + rpc_init("statd", SM_PROG, SM_VERS, sm_prog_1, port); + if (once) { + once = 0; + drop_privs(); + } /* * Handle incoming requests: SM_NOTIFY socket requests, as * well as callbacks from lockd. */ my_svc_run(); /* I rolled my own, Olaf made it better... */ - if ((run_mode & MODE_NOTIFY_ONLY)) - break; + /* Only get here when simulating a crash so we should probably + * start sm-notify running again. As we have already dropped + * privileges, this might not work, but I don't think + * responding to SM_SIMU_CRASH is an important use cases to + * get perfect. + */ + if (! (run_mode & MODE_NO_NOTIFY)) + switch (pid = fork()) { + case 0: + run_sm_notify(out_port); + break; + case -1: + break; + default: + waitpid(pid, NULL, 0); + } + } return 0; }