summaryrefslogtreecommitdiffstats
path: root/usr.bin/last/last.c
diff options
context:
space:
mode:
Diffstat (limited to 'usr.bin/last/last.c')
-rw-r--r--usr.bin/last/last.c552
1 files changed, 552 insertions, 0 deletions
diff --git a/usr.bin/last/last.c b/usr.bin/last/last.c
new file mode 100644
index 0000000..e587def
--- /dev/null
+++ b/usr.bin/last/last.c
@@ -0,0 +1,552 @@
+/*
+ * Copyright (c) 1987, 1993, 1994
+ * The Regents of the University of California. 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.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ */
+
+#ifndef lint
+static const char copyright[] =
+"@(#) Copyright (c) 1987, 1993, 1994\n\
+ The Regents of the University of California. All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static const char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94";
+#endif /* not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/stat.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <langinfo.h>
+#include <locale.h>
+#include <paths.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <timeconv.h>
+#include <unistd.h>
+#include <utmpx.h>
+#include <sys/queue.h>
+
+#define NO 0 /* false/no */
+#define YES 1 /* true/yes */
+#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
+
+typedef struct arg {
+ char *name; /* argument */
+#define HOST_TYPE -2
+#define TTY_TYPE -3
+#define USER_TYPE -4
+ int type; /* type of arg */
+ struct arg *next; /* linked list pointer */
+} ARG;
+static ARG *arglist; /* head of linked list */
+
+static LIST_HEAD(idlisthead, idtab) idlist;
+
+struct idtab {
+ time_t logout; /* log out time */
+ char id[sizeof ((struct utmpx *)0)->ut_id]; /* identifier */
+ LIST_ENTRY(idtab) list;
+};
+
+static const char *crmsg; /* cause of last reboot */
+static time_t currentout; /* current logout value */
+static long maxrec; /* records to display */
+static const char *file = NULL; /* utx.log file */
+static int sflag = 0; /* show delta in seconds */
+static int width = 5; /* show seconds in delta */
+static int yflag; /* show year */
+static int d_first;
+static int snapfound = 0; /* found snapshot entry? */
+static time_t snaptime; /* if != 0, we will only
+ * report users logged in
+ * at this snapshot time
+ */
+
+static void addarg(int, char *);
+static time_t dateconv(char *);
+static void doentry(struct utmpx *);
+static void hostconv(char *);
+static void printentry(struct utmpx *, struct idtab *);
+static char *ttyconv(char *);
+static int want(struct utmpx *);
+static void usage(void);
+static void wtmp(void);
+
+static void
+usage(void)
+{
+ (void)fprintf(stderr,
+"usage: last [-swy] [-d [[CC]YY][MMDD]hhmm[.SS]] [-f file] [-h host]\n"
+" [-n maxrec] [-t tty] [user ...]\n");
+ exit(1);
+}
+
+int
+main(int argc, char *argv[])
+{
+ int ch;
+ char *p;
+
+ (void) setlocale(LC_TIME, "");
+ d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
+
+ maxrec = -1;
+ snaptime = 0;
+ while ((ch = getopt(argc, argv, "0123456789d:f:h:n:st:wy")) != -1)
+ switch (ch) {
+ case '0': case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ /*
+ * kludge: last was originally designed to take
+ * a number after a dash.
+ */
+ if (maxrec == -1) {
+ p = strchr(argv[optind - 1], ch);
+ if (p == NULL)
+ p = strchr(argv[optind], ch);
+ maxrec = atol(p);
+ if (!maxrec)
+ exit(0);
+ }
+ break;
+ case 'd':
+ snaptime = dateconv(optarg);
+ break;
+ case 'f':
+ file = optarg;
+ break;
+ case 'h':
+ hostconv(optarg);
+ addarg(HOST_TYPE, optarg);
+ break;
+ case 'n':
+ errno = 0;
+ maxrec = strtol(optarg, &p, 10);
+ if (p == optarg || *p != '\0' || errno != 0 ||
+ maxrec <= 0)
+ errx(1, "%s: bad line count", optarg);
+ break;
+ case 's':
+ sflag++; /* Show delta as seconds */
+ break;
+ case 't':
+ addarg(TTY_TYPE, ttyconv(optarg));
+ break;
+ case 'w':
+ width = 8;
+ break;
+ case 'y':
+ yflag++;
+ break;
+ case '?':
+ default:
+ usage();
+ }
+
+ if (sflag && width == 8) usage();
+
+ if (argc) {
+ setlinebuf(stdout);
+ for (argv += optind; *argv; ++argv) {
+#define COMPATIBILITY
+#ifdef COMPATIBILITY
+ /* code to allow "last p5" to work */
+ addarg(TTY_TYPE, ttyconv(*argv));
+#endif
+ addarg(USER_TYPE, *argv);
+ }
+ }
+ wtmp();
+ exit(0);
+}
+
+/*
+ * wtmp --
+ * read through the utx.log file
+ */
+static void
+wtmp(void)
+{
+ struct utmpx *buf = NULL;
+ struct utmpx *ut;
+ static unsigned int amount = 0;
+ time_t t;
+ char ct[80];
+ struct tm *tm;
+
+ LIST_INIT(&idlist);
+ (void)time(&t);
+
+ /* Load the last entries from the file. */
+ if (setutxdb(UTXDB_LOG, file) != 0)
+ err(1, "%s", file);
+ while ((ut = getutxent()) != NULL) {
+ if (amount % 128 == 0) {
+ buf = realloc(buf, (amount + 128) * sizeof *ut);
+ if (buf == NULL)
+ err(1, "realloc");
+ }
+ memcpy(&buf[amount++], ut, sizeof *ut);
+ if (t > ut->ut_tv.tv_sec)
+ t = ut->ut_tv.tv_sec;
+ }
+ endutxent();
+
+ /* Display them in reverse order. */
+ while (amount > 0)
+ doentry(&buf[--amount]);
+
+ tm = localtime(&t);
+ (void) strftime(ct, sizeof(ct), "%+", tm);
+ printf("\n%s begins %s\n", ((file == NULL) ? "utx.log" : file), ct);
+}
+
+/*
+ * doentry --
+ * process a single utx.log entry
+ */
+static void
+doentry(struct utmpx *bp)
+{
+ struct idtab *tt, *ttx; /* idlist entry */
+
+ /* the machine stopped */
+ if (bp->ut_type == BOOT_TIME || bp->ut_type == SHUTDOWN_TIME) {
+ /* everybody just logged out */
+ for (tt = LIST_FIRST(&idlist); tt;) {
+ LIST_REMOVE(tt, list);
+ ttx = tt;
+ tt = LIST_NEXT(tt, list);
+ free(ttx);
+ }
+ currentout = -bp->ut_tv.tv_sec;
+ crmsg = bp->ut_type != SHUTDOWN_TIME ?
+ "crash" : "shutdown";
+ /*
+ * if we're in snapshot mode, we want to exit if this
+ * shutdown/reboot appears while we we are tracking the
+ * active range
+ */
+ if (snaptime && snapfound)
+ exit(0);
+ /*
+ * don't print shutdown/reboot entries unless flagged for
+ */
+ if (!snaptime && want(bp))
+ printentry(bp, NULL);
+ return;
+ }
+ /* date got set */
+ if (bp->ut_type == OLD_TIME || bp->ut_type == NEW_TIME) {
+ if (want(bp) && !snaptime)
+ printentry(bp, NULL);
+ return;
+ }
+
+ if (bp->ut_type != USER_PROCESS && bp->ut_type != DEAD_PROCESS)
+ return;
+
+ /* find associated identifier */
+ LIST_FOREACH(tt, &idlist, list)
+ if (!memcmp(tt->id, bp->ut_id, sizeof bp->ut_id))
+ break;
+
+ if (tt == NULL) {
+ /* add new one */
+ tt = malloc(sizeof(struct idtab));
+ if (tt == NULL)
+ errx(1, "malloc failure");
+ tt->logout = currentout;
+ memcpy(tt->id, bp->ut_id, sizeof bp->ut_id);
+ LIST_INSERT_HEAD(&idlist, tt, list);
+ }
+
+ /*
+ * print record if not in snapshot mode and wanted
+ * or in snapshot mode and in snapshot range
+ */
+ if (bp->ut_type == USER_PROCESS && (want(bp) ||
+ (bp->ut_tv.tv_sec < snaptime &&
+ (tt->logout > snaptime || tt->logout < 1)))) {
+ snapfound = 1;
+ printentry(bp, tt);
+ }
+ tt->logout = bp->ut_tv.tv_sec;
+}
+
+/*
+ * printentry --
+ * output an entry
+ *
+ * If `tt' is non-NULL, use it and `crmsg' to print the logout time or
+ * logout type (crash/shutdown) as appropriate.
+ */
+static void
+printentry(struct utmpx *bp, struct idtab *tt)
+{
+ char ct[80];
+ struct tm *tm;
+ time_t delta; /* time difference */
+ time_t t;
+
+ if (maxrec != -1 && !maxrec--)
+ exit(0);
+ t = bp->ut_tv.tv_sec;
+ tm = localtime(&t);
+ (void) strftime(ct, sizeof(ct), d_first ?
+ (yflag ? "%a %e %b %Y %R" : "%a %e %b %R") :
+ (yflag ? "%a %b %e %Y %R" : "%a %b %e %R"), tm);
+ switch (bp->ut_type) {
+ case BOOT_TIME:
+ printf("%-42s", "boot time");
+ break;
+ case SHUTDOWN_TIME:
+ printf("%-42s", "shutdown time");
+ break;
+ case OLD_TIME:
+ printf("%-42s", "old time");
+ break;
+ case NEW_TIME:
+ printf("%-42s", "new time");
+ break;
+ case USER_PROCESS:
+ printf("%-10s %-8s %-22.22s",
+ bp->ut_user, bp->ut_line, bp->ut_host);
+ break;
+ }
+ printf(" %s%c", ct, tt == NULL ? '\n' : ' ');
+ if (tt == NULL)
+ return;
+ if (!tt->logout) {
+ puts(" still logged in");
+ return;
+ }
+ if (tt->logout < 0) {
+ tt->logout = -tt->logout;
+ printf("- %s", crmsg);
+ } else {
+ tm = localtime(&tt->logout);
+ (void) strftime(ct, sizeof(ct), "%R", tm);
+ printf("- %s", ct);
+ }
+ delta = tt->logout - bp->ut_tv.tv_sec;
+ if (sflag) {
+ printf(" (%8ld)\n", (long)delta);
+ } else {
+ tm = gmtime(&delta);
+ (void) strftime(ct, sizeof(ct), width >= 8 ? "%T" : "%R", tm);
+ if (delta < 86400)
+ printf(" (%s)\n", ct);
+ else
+ printf(" (%ld+%s)\n", (long)delta / 86400, ct);
+ }
+}
+
+/*
+ * want --
+ * see if want this entry
+ */
+static int
+want(struct utmpx *bp)
+{
+ ARG *step;
+
+ if (snaptime)
+ return (NO);
+
+ if (!arglist)
+ return (YES);
+
+ for (step = arglist; step; step = step->next)
+ switch(step->type) {
+ case HOST_TYPE:
+ if (!strcasecmp(step->name, bp->ut_host))
+ return (YES);
+ break;
+ case TTY_TYPE:
+ if (!strcmp(step->name, bp->ut_line))
+ return (YES);
+ break;
+ case USER_TYPE:
+ if (!strcmp(step->name, bp->ut_user))
+ return (YES);
+ break;
+ }
+ return (NO);
+}
+
+/*
+ * addarg --
+ * add an entry to a linked list of arguments
+ */
+static void
+addarg(int type, char *arg)
+{
+ ARG *cur;
+
+ if ((cur = malloc(sizeof(ARG))) == NULL)
+ errx(1, "malloc failure");
+ cur->next = arglist;
+ cur->type = type;
+ cur->name = arg;
+ arglist = cur;
+}
+
+/*
+ * hostconv --
+ * convert the hostname to search pattern; if the supplied host name
+ * has a domain attached that is the same as the current domain, rip
+ * off the domain suffix since that's what login(1) does.
+ */
+static void
+hostconv(char *arg)
+{
+ static int first = 1;
+ static char *hostdot, name[MAXHOSTNAMELEN];
+ char *argdot;
+
+ if (!(argdot = strchr(arg, '.')))
+ return;
+ if (first) {
+ first = 0;
+ if (gethostname(name, sizeof(name)))
+ err(1, "gethostname");
+ hostdot = strchr(name, '.');
+ }
+ if (hostdot && !strcasecmp(hostdot, argdot))
+ *argdot = '\0';
+}
+
+/*
+ * ttyconv --
+ * convert tty to correct name.
+ */
+static char *
+ttyconv(char *arg)
+{
+ char *mval;
+
+ /*
+ * kludge -- we assume that all tty's end with
+ * a two character suffix.
+ */
+ if (strlen(arg) == 2) {
+ /* either 6 for "ttyxx" or 8 for "console" */
+ if ((mval = malloc(8)) == NULL)
+ errx(1, "malloc failure");
+ if (!strcmp(arg, "co"))
+ (void)strcpy(mval, "console");
+ else {
+ (void)strcpy(mval, "tty");
+ (void)strcpy(mval + 3, arg);
+ }
+ return (mval);
+ }
+ if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1))
+ return (arg + 5);
+ return (arg);
+}
+
+/*
+ * dateconv --
+ * Convert the snapshot time in command line given in the format
+ * [[CC]YY]MMDDhhmm[.SS]] to a time_t.
+ * Derived from atime_arg1() in usr.bin/touch/touch.c
+ */
+static time_t
+dateconv(char *arg)
+{
+ time_t timet;
+ struct tm *t;
+ int yearset;
+ char *p;
+
+ /* Start with the current time. */
+ if (time(&timet) < 0)
+ err(1, "time");
+ if ((t = localtime(&timet)) == NULL)
+ err(1, "localtime");
+
+ /* [[CC]YY]MMDDhhmm[.SS] */
+ if ((p = strchr(arg, '.')) == NULL)
+ t->tm_sec = 0; /* Seconds defaults to 0. */
+ else {
+ if (strlen(p + 1) != 2)
+ goto terr;
+ *p++ = '\0';
+ t->tm_sec = ATOI2(p);
+ }
+
+ yearset = 0;
+ switch (strlen(arg)) {
+ case 12: /* CCYYMMDDhhmm */
+ t->tm_year = ATOI2(arg);
+ t->tm_year *= 100;
+ yearset = 1;
+ /* FALLTHROUGH */
+ case 10: /* YYMMDDhhmm */
+ if (yearset) {
+ yearset = ATOI2(arg);
+ t->tm_year += yearset;
+ } else {
+ yearset = ATOI2(arg);
+ if (yearset < 69)
+ t->tm_year = yearset + 2000;
+ else
+ t->tm_year = yearset + 1900;
+ }
+ t->tm_year -= 1900; /* Convert to UNIX time. */
+ /* FALLTHROUGH */
+ case 8: /* MMDDhhmm */
+ t->tm_mon = ATOI2(arg);
+ --t->tm_mon; /* Convert from 01-12 to 00-11 */
+ t->tm_mday = ATOI2(arg);
+ t->tm_hour = ATOI2(arg);
+ t->tm_min = ATOI2(arg);
+ break;
+ case 4: /* hhmm */
+ t->tm_hour = ATOI2(arg);
+ t->tm_min = ATOI2(arg);
+ break;
+ default:
+ goto terr;
+ }
+ t->tm_isdst = -1; /* Figure out DST. */
+ timet = mktime(t);
+ if (timet == -1)
+terr: errx(1,
+ "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
+ return timet;
+}
OpenPOWER on IntegriCloud