/* * Copyright (c) 1989 - 1994, Julianne Frances Haugh * Copyright (c) 1996 - 2000, Marek Michałkiewicz * Copyright (c) 2000 - 2006, Tomasz Kłoczko * Copyright (c) 2007 - 2011, Nicolas François * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the copyright holders or contributors may not be used to * endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #ident "$Id: lastlog.c 3560 2011-11-06 18:39:59Z nekral-guest $" #include #include #include #include #include #include #include #include #include "defines.h" #include "prototypes.h" /*@-exitarg@*/ #include "exitcodes.h" /* * Needed for MkLinux DR1/2/2.1 - J. */ #ifndef LASTLOG_FILE #define LASTLOG_FILE "/var/log/lastlog" #endif /* * Global variables */ const char *Prog; /* Program name */ static FILE *lastlogfile; /* lastlog file stream */ static unsigned long umin; /* if uflg and has_umin, only display users with uid >= umin */ static bool has_umin = false; static unsigned long umax; /* if uflg and has_umax, only display users with uid <= umax */ static bool has_umax = false; static time_t seconds; /* that number of days in seconds */ static time_t inverse_seconds; /* that number of days in seconds */ static struct stat statbuf; /* fstat buffer for file size */ static bool uflg = false; /* print only an user of range of users */ static bool tflg = false; /* print is restricted to most recent days */ static bool bflg = false; /* print excludes most recent days */ #define NOW (time ((time_t *) 0)) static /*@noreturn@*/void usage (int status) { FILE *usageout = (E_SUCCESS != status) ? stderr : stdout; (void) fprintf (usageout, _("Usage: %s [options]\n" "\n" "Options:\n"), Prog); (void) fputs (_(" -b, --before DAYS print only lastlog records older than DAYS\n"), usageout); (void) fputs (_(" -h, --help display this help message and exit\n"), usageout); (void) fputs (_(" -R, --root CHROOT_DIR directory to chroot into\n"), usageout); (void) fputs (_(" -t, --time DAYS print only lastlog records more recent than DAYS\n"), usageout); (void) fputs (_(" -u, --user LOGIN print lastlog record of the specified LOGIN\n"), usageout); (void) fputs ("\n", usageout); exit (status); } static void print_one (/*@null@*/const struct passwd *pw) { static bool once = false; char *cp; struct tm *tm; time_t ll_time; off_t offset; struct lastlog ll; #ifdef HAVE_STRFTIME char ptime[80]; #endif if (NULL == pw) { return; } offset = (off_t) pw->pw_uid * sizeof (ll); if (offset + sizeof (ll) <= statbuf.st_size) { /* fseeko errors are not really relevant for us. */ int err = fseeko (lastlogfile, offset, SEEK_SET); assert (0 == err); /* lastlog is a sparse file. Even if no entries were * entered for this user, which should be able to get the * empty entry in this case. */ if (fread ((char *) &ll, sizeof (ll), 1, lastlogfile) != 1) { fprintf (stderr, _("%s: Failed to get the entry for UID %lu\n"), Prog, (unsigned long int)pw->pw_uid); exit (EXIT_FAILURE); } } else { /* Outsize of the lastlog file. * Behave as if there were a missing entry (same behavior * as if we were reading an non existing entry in the * sparse lastlog file). */ memzero (&ll, sizeof (ll)); } /* Filter out entries that do not match with the -t or -b options */ if (tflg && ((NOW - ll.ll_time) > seconds)) { return; } if (bflg && ((NOW - ll.ll_time) < inverse_seconds)) { return; } /* Print the header only once */ if (!once) { #ifdef HAVE_LL_HOST puts (_("Username Port From Latest")); #else puts (_("Username Port Latest")); #endif once = true; } ll_time = ll.ll_time; tm = localtime (&ll_time); #ifdef HAVE_STRFTIME strftime (ptime, sizeof (ptime), "%a %b %e %H:%M:%S %z %Y", tm); cp = ptime; #else cp = asctime (tm); cp[24] = '\0'; #endif if (ll.ll_time == (time_t) 0) { cp = _("**Never logged in**\0"); } #ifdef HAVE_LL_HOST printf ("%-16s %-8.8s %-16.16s %s\n", pw->pw_name, ll.ll_line, ll.ll_host, cp); #else printf ("%-16s\t%-8.8s %s\n", pw->pw_name, ll.ll_line, cp); #endif } static void print (void) { const struct passwd *pwent; if (uflg && has_umin && has_umax && (umin == umax)) { print_one (getpwuid ((uid_t)umin)); } else { setpwent (); while ( (pwent = getpwent ()) != NULL ) { if ( uflg && ( (has_umin && (pwent->pw_uid < (uid_t)umin)) || (has_umax && (pwent->pw_uid > (uid_t)umax)))) { continue; } print_one (pwent); } endpwent (); } } int main (int argc, char **argv) { /* * Get the program name. The program name is used as a prefix to * most error messages. */ Prog = Basename (argv[0]); (void) setlocale (LC_ALL, ""); (void) bindtextdomain (PACKAGE, LOCALEDIR); (void) textdomain (PACKAGE); process_root_flag ("-R", argc, argv); { int c; static struct option const longopts[] = { {"before", required_argument, NULL, 'b'}, {"help", no_argument, NULL, 'h'}, {"root", required_argument, NULL, 'R'}, {"time", required_argument, NULL, 't'}, {"user", required_argument, NULL, 'u'}, {NULL, 0, NULL, '\0'} }; while ((c = getopt_long (argc, argv, "b:hR:t:u:", longopts, NULL)) != -1) { switch (c) { case 'b': { unsigned long inverse_days; if (getulong (optarg, &inverse_days) == 0) { fprintf (stderr, _("%s: invalid numeric argument '%s'\n"), Prog, optarg); exit (EXIT_FAILURE); } inverse_seconds = (time_t) inverse_days * DAY; bflg = true; break; } case 'h': usage (EXIT_SUCCESS); /*@notreached@*/break; case 'R': /* no-op, handled in process_root_flag () */ break; case 't': { unsigned long days; if (getulong (optarg, &days) == 0) { fprintf (stderr, _("%s: invalid numeric argument '%s'\n"), Prog, optarg); exit (EXIT_FAILURE); } seconds = (time_t) days * DAY; tflg = true; break; } case 'u': { const struct passwd *pwent; /* * The user can be: * - a login name * - numerical * - a numerical login ID * - a range (-x, x-, x-y) */ uflg = true; /* local, no need for xgetpwnam */ pwent = getpwnam (optarg); if (NULL != pwent) { umin = (unsigned long) pwent->pw_uid; has_umin = true; umax = umin; has_umax = true; } else { if (getrange (optarg, &umin, &has_umin, &umax, &has_umax) == 0) { fprintf (stderr, _("%s: Unknown user or range: %s\n"), Prog, optarg); exit (EXIT_FAILURE); } } break; } default: usage (EXIT_FAILURE); /*@notreached@*/break; } } if (argc > optind) { fprintf (stderr, _("%s: unexpected argument: %s\n"), Prog, argv[optind]); usage (EXIT_FAILURE); } } lastlogfile = fopen (LASTLOG_FILE, "r"); if (NULL == lastlogfile) { perror (LASTLOG_FILE); exit (EXIT_FAILURE); } /* Get the lastlog size */ if (fstat (fileno (lastlogfile), &statbuf) != 0) { fprintf (stderr, _("%s: Cannot get the size of %s: %s\n"), Prog, LASTLOG_FILE, strerror (errno)); exit (EXIT_FAILURE); } print (); (void) fclose (lastlogfile); return EXIT_SUCCESS; }