diff options
Diffstat (limited to 'login/programs/utmpd.c')
| -rw-r--r-- | login/programs/utmpd.c | 419 |
1 files changed, 0 insertions, 419 deletions
diff --git a/login/programs/utmpd.c b/login/programs/utmpd.c deleted file mode 100644 index ec16b9e778..0000000000 --- a/login/programs/utmpd.c +++ /dev/null @@ -1,419 +0,0 @@ -/* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -#include <errno.h> -#include <fcntl.h> -#include <getopt.h> -#include <libintl.h> -#include <locale.h> -#include <pwd.h> -#include <stddef.h> -#include <stdio.h> -#include <stdlib.h> -#include <signal.h> -#include <string.h> -#include <sys/param.h> -#include <sys/select.h> -#include <sys/socket.h> -#include <sys/stat.h> -#include <sys/types.h> -#include <sys/un.h> -#include <syslog.h> -#include <unistd.h> - -#include "utmpd.h" -#include "utmpd-private.h" - -#ifndef DEFAULT_USER -#define DEFAULT_USER "daemon" -#endif - -/* Get libc version number. */ -#include <version.h> - -#define PACKAGE _libc_intl_domainname - -/* Long options. */ -static const struct option long_options[] = -{ - { "debug", no_argument, NULL, 'd' }, - { "help", no_argument, NULL, 'h' }, - { "version", no_argument, NULL, 'V' }, - { NULL, 0, NULL, 0} -}; - -/* The UTMP database. */ -utmp_database *utmp_db; - -/* The socket for read only requests. */ -int ro_sock = -1; - -/* The socket for read/write requests. */ -int rw_sock = -1; - - -/* Prototypes for the local functions. */ -static void usage (int status) __attribute__ ((noreturn)); -static void drop_priviliges (void); -static int make_socket (const char *name); -static void handle_requests (void) __attribute__ ((noreturn)); -static void termination_handler (int signum); -static int check_pid (const char *file); -static int write_pid (const char *file); - - -int -main (int argc, char *argv[]) -{ - mode_t mask; - int debug; - int do_help; - int do_version; - int opt; - - /* Set locale via LC_ALL. */ - setlocale (LC_ALL, ""); - - /* Set the text message domain. */ - textdomain (PACKAGE); - - /* Initialize local variables. */ - debug = 0; - do_help = 0; - do_version = 0; - - while ((opt = getopt_long (argc, argv, "dhV", long_options, NULL)) != -1) - switch (opt) - { - case '\0': /* Long option. */ - break; - case 'h': - do_help = 1; - break; - case 'd': - debug = 1; - break; - case 'V': - do_version = 1; - break; - default: - usage (EXIT_FAILURE); - } - - /* Version information is reequested. */ - if (do_version) - { - printf ("utmpd (GNU %s) %s\n", PACKAGE, VERSION); - printf (_("\ -Copyright (C) %s Free Software Foundation, Inc.\n\ -This is free software; see the source for copying conditions. There is NO\n\ -warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\ -"), "1999"); - printf (_("Written by %s.\n"), "Mark Kettenis"); - - exit (EXIT_SUCCESS); - } - - /* Help is requested. */ - if (do_help) - usage (EXIT_SUCCESS); - - signal (SIGINT, termination_handler); - signal (SIGQUIT, termination_handler); - signal (SIGTERM, termination_handler); - - /* Check if we are already running. */ - if (check_pid (_PATH_UTMPDPID)) - error (EXIT_FAILURE, 0, _("already running")); - - /* Cleanup files created by a previous `bind'. */ - unlink (_PATH_UTMPD_RO); - unlink (_PATH_UTMPD_RW); - - /* Open UTMP database. */ - utmp_db = open_database (_PATH_UTMP "x", _PATH_UTMP); - if (utmp_db == NULL) - exit (EXIT_FAILURE); - - /* Create sockets, with the right permissions. */ - mask = umask (S_IXUSR | S_IXGRP | S_IXOTH); - ro_sock = make_socket (_PATH_UTMPD_RO); - umask (S_IXUSR | S_IRWXG | S_IRWXO); - rw_sock = make_socket (_PATH_UTMPD_RW); - umask (mask); - - /* Set the sockets up to accept connections. */ - if (listen (ro_sock, MAX_CONNECTIONS) < 0 - || listen (rw_sock, MAX_CONNECTIONS) < 0) - error (EXIT_FAILURE, errno, - _("cannot enable socket to accept connections")); - - /* Behave like a daemon. */ - if (!debug) - { - openlog ("utmpd", LOG_CONS | LOG_ODELAY, LOG_DAEMON); - - if (daemon (0, 0) < 0) - error (EXIT_FAILURE, errno, _("cannot auto-background")); - forked = 1; - - if (write_pid (_PATH_UTMPDPID) < 0) - warning (errno, "%s", _PATH_UTMPDPID); - - /* Ignore job control signals. */ - signal (SIGTTOU, SIG_IGN); - signal (SIGTTIN, SIG_IGN); - signal (SIGTSTP, SIG_IGN); - } - - /* Drop priviliges. */ - drop_priviliges (); - - /* Handle incoming requests. */ - handle_requests (); -} - - -/* Display usage information and exit. */ -static void -usage (int status) -{ - if (status != EXIT_SUCCESS) - fprintf (stderr, _("Try `%s --help' for more information.\n"), - program_invocation_name); - else - { - printf (_("\ -Usage: %s [OPTION]...\n\ - -d, --debug do not fork and display messages on the current tty\n\ - -h, --help display this help and exit\n\ - -V, --version output version information and exit\n"), - program_invocation_name); - fputs (_("\ -Report bugs using the `glibcbug' script to <bugs@gnu.org>.\n"), - stdout); - } - - exit (status); -} - - -/* Drop priviliges. */ -static void -drop_priviliges (void) -{ - struct passwd *pw; - - pw = getpwnam (DEFAULT_USER); - if (pw) - { - seteuid (pw->pw_uid); - setegid (pw->pw_gid); - } -} - - -/* Make a socket in the file namespace using the filename NAME as the - socket's address. */ -static int -make_socket (const char *name) -{ - struct sockaddr_un addr; - size_t size; - int sock; - - /* Create the socket. */ - sock = socket (PF_UNIX, SOCK_STREAM, 0); - if (sock < 0) - error (EXIT_FAILURE, errno, _("cannot create socket")); - - /* Bind a name to the socket. */ - addr.sun_family = AF_UNIX; - strcpy (addr.sun_path, name); - - /* The size of the address is the offset of the start - of the filename, plus its length, plus one for the - terminating null byte. */ - size = (offsetof (struct sockaddr_un, sun_path) - + strlen (addr.sun_path)); - - - if (bind (sock, (struct sockaddr *) &addr, size) < 0) - error (EXIT_FAILURE, errno, "%s", name); - - return sock; -} - - -/* Hanlde incoming requests. */ -static -void handle_requests (void) -{ - client_connection *connection; - fd_set active_read_fd_set; - fd_set active_write_fd_set; - fd_set read_fd_set; - fd_set write_fd_set; - int fd; - int maxfd; /* Highest used fd to optimize select/loop. */ - - /* Initialize the set of active sockets. */ - FD_ZERO (&active_read_fd_set); - FD_ZERO (&active_write_fd_set); - FD_SET (rw_sock, &active_read_fd_set); - FD_SET (ro_sock, &active_read_fd_set); - - maxfd = MAX (rw_sock, ro_sock); - - while (1) - { - /* Block until input arrives on one or more active sockets. */ - read_fd_set = active_read_fd_set; - write_fd_set = active_write_fd_set; - if (select (maxfd + 1, &read_fd_set, &write_fd_set, NULL, NULL) < 0) - error (EXIT_FAILURE, errno, _("cannot get input on sockets")); - - /* Service all the sockets with input pending. */ - for (fd = 0; fd <= maxfd; ++fd) - { - if (FD_ISSET (fd, &read_fd_set)) - { - if (fd == ro_sock || fd == rw_sock) - { - int access = ((fd == rw_sock) ? (R_OK | W_OK) : R_OK); - - connection = accept_connection (fd, access); - if (connection == NULL) - error (0, errno, _("cannot accept connection")); - - FD_SET (connection->sock, &active_read_fd_set); - maxfd = MAX (maxfd, connection->sock); - } - else - { - connection = find_connection (fd); - if (connection == NULL) - error (EXIT_FAILURE, 0, _("cannot find connection")); - - if (read_data (connection) < 0) - { - close_connection (connection); - FD_CLR (fd, &active_read_fd_set); - FD_CLR (fd, &active_write_fd_set); - } - - if (connection->write_ptr > connection->write_base) - FD_SET (fd, &active_write_fd_set); - } - } - if (FD_ISSET (fd, &write_fd_set) && - fd != rw_sock && fd != ro_sock) - { - connection = find_connection (fd); - if (connection == NULL) - error (EXIT_FAILURE, 0, _("cannot find connection")); - - if (write_data (connection) < 0) - { - close_connection (connection); - FD_CLR (fd, &active_read_fd_set); - FD_CLR (fd, &active_write_fd_set); - } - - if (connection->write_ptr == connection->write_base) - FD_CLR (fd, &active_write_fd_set); - } - } - - /* Check if maxfd can be lowered. */ - for (; maxfd >= 0; --maxfd) - { - if (FD_ISSET (maxfd, &active_read_fd_set) - || FD_ISSET (maxfd, &active_write_fd_set)) - break; - } - } -} - - -/* Cleanup. */ -static void -termination_handler (int signum) -{ - /* Close sockets. */ - close (ro_sock); - close (rw_sock); - - /* Restore user id. */ - seteuid (getuid ()); - - /* Clean up the files created by `bind'. */ - unlink (_PATH_UTMPD_RO); - unlink (_PATH_UTMPD_RW); - - if (utmp_db) - close_database (utmp_db); - - /* Clean up pid file. */ - unlink (_PATH_UTMPDPID); - - exit (EXIT_SUCCESS); -} - - -/* Returns 1 if the process in pid file FILE is running, 0 if not. */ -static int -check_pid (const char *file) -{ - FILE *fp; - - fp = fopen (_PATH_UTMPDPID, "r"); - if (fp) - { - pid_t pid; - - fscanf (fp, "%d", &pid); - fclose (fp); - - if (kill (pid, 0) == 0) - return 1; - } - - return 0; -} - -/* Write the current process id to the file FILE. Returns 0 if - successful, -1 if not. */ -static int -write_pid (const char *file) -{ - FILE *fp; - - fp = fopen (_PATH_UTMPDPID, "w"); - if (fp == NULL) - return -1; - - fprintf (fp, "%d\n", getpid ()); - if (ferror (fp)) - return -1; - - fclose (fp); - - return 0; -} |