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Diffstat (limited to 'src/lastlog.c')
| -rw-r--r-- | src/lastlog.c | 428 |
1 files changed, 428 insertions, 0 deletions
diff --git a/src/lastlog.c b/src/lastlog.c new file mode 100644 index 0000000..965691d --- /dev/null +++ b/src/lastlog.c @@ -0,0 +1,428 @@ +/* + * 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 <config.h> + +#ident "$Id$" + +#include <getopt.h> +#include <lastlog.h> +#include <pwd.h> +#include <stdio.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <time.h> +#include <assert.h> +#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 */ +static bool Cflg = false; /* clear record for user */ +static bool Sflg = false; /* set record for user */ + +#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 (_(" -C, --clear clear lastlog record of an user (usable only with -u)\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 (_(" -S, --set set lastlog record to current time (usable only with -u)\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 (); + } +} + +static void update_one (/*@null@*/const struct passwd *pw) +{ + off_t offset; + struct lastlog ll; + int err; + + if (NULL == pw) { + return; + } + + offset = (off_t) pw->pw_uid * sizeof (ll); + /* fseeko errors are not really relevant for us. */ + err = fseeko (lastlogfile, offset, SEEK_SET); + assert (0 == err); + + memzero (&ll, sizeof (ll)); + + if (Sflg) { + ll.ll_time = NOW; +#ifdef HAVE_LL_HOST + strcpy (ll.ll_host, "localhost"); +#endif + strcpy (ll.ll_line, "lastlog"); +#ifdef WITH_AUDIT + audit_logger (AUDIT_ACCT_UNLOCK, Prog, + "clearing-lastlog", + pw->pw_name, (unsigned int) pw->pw_uid, SHADOW_AUDIT_SUCCESS); +#endif + } +#ifdef WITH_AUDIT + else { + audit_logger (AUDIT_ACCT_UNLOCK, Prog, + "refreshing-lastlog", + pw->pw_name, (unsigned int) pw->pw_uid, SHADOW_AUDIT_SUCCESS); + } +#endif + + if (fwrite (&ll, sizeof(ll), 1, lastlogfile) != 1) { + fprintf (stderr, + _("%s: Failed to update the entry for UID %lu\n"), + Prog, (unsigned long int)pw->pw_uid); + exit (EXIT_FAILURE); + } +} + +static void update (void) +{ + const struct passwd *pwent; + + if (!uflg) /* safety measure */ + return; + + if (has_umin && has_umax && (umin == umax)) { + update_one (getpwuid ((uid_t)umin)); + } else { + setpwent (); + while ( (pwent = getpwent ()) != NULL ) { + if ((has_umin && (pwent->pw_uid < (uid_t)umin)) + || (has_umax && (pwent->pw_uid > (uid_t)umax))) { + continue; + } + update_one (pwent); + } + endpwent (); + } + + if (fflush (lastlogfile) != 0 || fsync (fileno (lastlogfile)) != 0) { + fprintf (stderr, + _("%s: Failed to update the lastlog file\n"), + Prog); + exit (EXIT_FAILURE); + } +} + +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); + +#ifdef WITH_AUDIT + audit_help_open (); +#endif + + { + int c; + static struct option const longopts[] = { + {"before", required_argument, NULL, 'b'}, + {"clear", no_argument, NULL, 'C'}, + {"help", no_argument, NULL, 'h'}, + {"root", required_argument, NULL, 'R'}, + {"set", no_argument, NULL, 'S'}, + {"time", required_argument, NULL, 't'}, + {"user", required_argument, NULL, 'u'}, + {NULL, 0, NULL, '\0'} + }; + + while ((c = getopt_long (argc, argv, "b:ChR:St: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 'C': + { + Cflg = true; + break; + } + case 'h': + usage (EXIT_SUCCESS); + /*@notreached@*/break; + case 'R': /* no-op, handled in process_root_flag () */ + break; + case 'S': + { + Sflg = true; + 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); + } + if (Cflg && Sflg) { + fprintf (stderr, + _("%s: Option -C cannot be used together with option -S\n"), + Prog); + usage (EXIT_FAILURE); + } + if ((Cflg || Sflg) && !uflg) { + fprintf (stderr, + _("%s: Options -C and -S require option -u to specify the user\n"), + Prog); + usage (EXIT_FAILURE); + } + } + + lastlogfile = fopen (LASTLOG_FILE, (Cflg || Sflg)?"r+":"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); + } + + if (Cflg || Sflg) + update (); + else + print (); + + (void) fclose (lastlogfile); + + return EXIT_SUCCESS; +} + |