* src/lastlog.c: lastlog variable renamed to ll to avoid name
clash with the structure. * src/lastlog.c: check the offset in print_one() so that it is used for the display of one entry or a set of entries. * src/lastlog.c: Do not loop over the whole user database when -u is used with a single user. * src/lastlog.c: Check the size of the lastlog file so that we can identify failures to read.
This commit is contained in:
nekral-guest
parent
87da822c7f
commit
bf9036d27a
11
ChangeLog
11
ChangeLog
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@ -1,3 +1,14 @@
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2009-03-13 Nicolas François <nicolas.francois@centraliens.net>
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* src/lastlog.c: lastlog variable renamed to ll to avoid name
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clash with the structure.
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* src/lastlog.c: check the offset in print_one() so that it is
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used for the display of one entry or a set of entries.
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* src/lastlog.c: Do not loop over the whole user database when -u
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is used with a single user.
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* src/lastlog.c: Check the size of the lastlog file so that we
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can identify failures to read.
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2009-03-13 Mike Frysinger <vapier@gentoo.org>
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* libmisc/salt.c: Removed l64a prototype. The libc declaration is
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114
src/lastlog.c
114
src/lastlog.c
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@ -2,7 +2,7 @@
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* Copyright (c) 1989 - 1994, Julianne Frances Haugh
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* Copyright (c) 1996 - 2000, Marek Michałkiewicz
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* Copyright (c) 2000 - 2006, Tomasz Kłoczko
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* Copyright (c) 2007 - 2008, Nicolas François
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* Copyright (c) 2007 - 2009, Nicolas François
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -41,6 +41,7 @@
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <time.h>
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#include <assert.h>
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#include "defines.h"
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#include "prototypes.h"
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@ -55,20 +56,20 @@
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* Global variables
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*/
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static FILE *lastlogfile; /* lastlog file stream */
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static unsigned long umin; /* if uflg, only display users with uid >= umin */
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static unsigned long umin; /* if uflg and has_umin, only display users with uid >= umin */
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static bool has_umin = false;
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static unsigned long umax; /* if uflg, only display users with uid <= umax */
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static unsigned long umax; /* if uflg and has_umax, only display users with uid <= umax */
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static bool has_umax = false;
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static int days; /* number of days to consider for print command */
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static time_t seconds; /* that number of days in seconds */
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static int inverse_days; /* number of days to consider for print command */
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static time_t inverse_seconds; /* that number of days in seconds */
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static struct stat statbuf; /* fstat buffer for file size */
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static bool uflg = false; /* print only an user of range of users */
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static bool tflg = false; /* print is restricted to most recent days */
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static bool bflg = false; /* print excludes most recent days */
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static struct lastlog lastlog; /* scratch structure to play with ... */
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static struct passwd *pwent;
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#define NOW (time ((time_t *) 0))
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@ -92,6 +93,8 @@ static void print_one (const struct passwd *pw)
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char *cp;
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struct tm *tm;
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time_t ll_time;
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off_t offset;
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struct lastlog ll;
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#ifdef HAVE_STRFTIME
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char ptime[80];
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@ -101,6 +104,41 @@ static void print_one (const struct passwd *pw)
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return;
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}
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offset = pw->pw_uid * sizeof (ll);
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if (offset <= (statbuf.st_size - sizeof (ll))) {
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/* fseeko errors are not really relevant for us. */
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assert ( fseeko (lastlogfile, offset, SEEK_SET) == 0 );
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/* lastlog is a sparse file. Even if no entries were
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* entered for this user, which should be able to get the
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* empty entry in this case.
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*/
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if (fread ((char *) &ll, sizeof (ll), 1, lastlogfile) != 1) {
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fprintf (stderr,
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_("lastlog: Failed to get the entry for UID %d\n"),
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pw->pw_uid);
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exit (1);
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}
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} else {
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/* Outsize of the lastlog file.
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* Behave as if there were a missing entry (same behavior
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* as if we were reading an non existing entry in the
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* sparse lastlog file).
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*/
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memzero (&ll, sizeof (ll));
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}
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/* Filter out entries that do not match with the -t or -b options */
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if (tflg && ((NOW - ll.ll_time) > seconds)) {
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return;
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}
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if (bflg && ((NOW - ll.ll_time) < inverse_seconds)) {
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return;
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}
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/* Print the header only once */
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if (!once) {
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#ifdef HAVE_LL_HOST
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puts (_("Username Port From Latest"));
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@ -109,7 +147,8 @@ static void print_one (const struct passwd *pw)
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#endif
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once = true;
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}
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ll_time = lastlog.ll_time;
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ll_time = ll.ll_time;
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tm = localtime (&ll_time);
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#ifdef HAVE_STRFTIME
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strftime (ptime, sizeof (ptime), "%a %b %e %H:%M:%S %z %Y", tm);
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@ -119,50 +158,35 @@ static void print_one (const struct passwd *pw)
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cp[24] = '\0';
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#endif
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if (lastlog.ll_time == (time_t) 0) {
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if (ll.ll_time == (time_t) 0) {
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cp = _("**Never logged in**\0");
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}
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#ifdef HAVE_LL_HOST
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printf ("%-16s %-8.8s %-16.16s %s\n", pw->pw_name,
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lastlog.ll_line, lastlog.ll_host, cp);
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printf ("%-16s %-8.8s %-16.16s %s\n",
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pw->pw_name, ll.ll_line, ll.ll_host, cp);
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#else
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printf ("%-16s\t%-8.8s %s\n", pw->pw_name, lastlog.ll_line, cp);
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printf ("%-16s\t%-8.8s %s\n",
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pw->pw_name, ll.ll_line, cp);
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#endif
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}
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static void print (void)
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{
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off_t offset;
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uid_t user;
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setpwent ();
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while ( (pwent = getpwent ()) != NULL ) {
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user = pwent->pw_uid;
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if ( uflg
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&& ( (has_umin && user < (uid_t)umin)
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|| (has_umax && user > (uid_t)umax))) {
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continue;
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if (uflg && has_umin && has_umax && (umin == umax)) {
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print_one (getpwuid ((uid_t)umin));
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} else {
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setpwent ();
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while ( (pwent = getpwent ()) != NULL ) {
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if ( uflg
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&& ( (has_umin && (pwent->pw_uid < (uid_t)umin))
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|| (has_umax && (pwent->pw_uid > (uid_t)umax)))) {
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continue;
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}
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print_one (pwent);
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}
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offset = user * sizeof lastlog;
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fseeko (lastlogfile, offset, SEEK_SET);
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if (fread ((char *) &lastlog, sizeof lastlog, 1,
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lastlogfile) != 1) {
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continue;
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}
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if (tflg && ((NOW - lastlog.ll_time) > seconds)) {
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continue;
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}
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if (bflg && ((NOW - lastlog.ll_time) < inverse_seconds)) {
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continue;
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}
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print_one (pwent);
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endpwent ();
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}
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endpwent ();
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}
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int main (int argc, char **argv)
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@ -181,9 +205,8 @@ int main (int argc, char **argv)
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{NULL, 0, NULL, '\0'}
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};
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while ((c =
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getopt_long (argc, argv, "ht:b:u:", longopts,
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NULL)) != -1) {
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while ((c = getopt_long (argc, argv, "ht:b:u:", longopts,
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NULL)) != -1) {
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switch (c) {
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case 'h':
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usage ();
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@ -207,7 +230,8 @@ int main (int argc, char **argv)
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* - a range (-x, x-, x-y)
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*/
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uflg = true;
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pwent = xgetpwnam (optarg);
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/* local, no need for xgetpwnam */
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pwent = getpwnam (optarg);
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if (NULL != pwent) {
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umin = (unsigned long) pwent->pw_uid;
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has_umin = true;
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@ -243,6 +267,14 @@ int main (int argc, char **argv)
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}
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print ();
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/* Get the laslog size */
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if (fstat (fileno (lastlogfile), &statbuf) != 0) {
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fprintf (stderr,
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_("lastlog: Cannot get the size of %s: %s\n"),
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LASTLOG_FILE, strerror (errno));
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exit (1);
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}
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fclose (lastlogfile);
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exit (0);
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}
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