From 4aca87515a5083ae0e31ce3177189fd43b6d05ac Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sat, 3 Jan 2015 13:58:15 +0100
Subject: patch to Vanilla Tomato 1.28

---
 release/src/router/busybox/miscutils/last.c | 133 ++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 release/src/router/busybox/miscutils/last.c

(limited to 'release/src/router/busybox/miscutils/last.c')

diff --git a/release/src/router/busybox/miscutils/last.c b/release/src/router/busybox/miscutils/last.c
new file mode 100644
index 00000000..f8c30139
--- /dev/null
+++ b/release/src/router/busybox/miscutils/last.c
@@ -0,0 +1,133 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * last implementation for busybox
+ *
+ * Copyright (C) 2003-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * Licensed under the GPL version 2, see the file LICENSE in this tarball.
+ */
+
+#include "libbb.h"
+#include <utmp.h>
+
+/* NB: ut_name and ut_user are the same field, use only one name (ut_user)
+ * to reduce confusion */
+
+#ifndef SHUTDOWN_TIME
+#  define SHUTDOWN_TIME 254
+#endif
+
+/* Grr... utmp char[] members do not have to be nul-terminated.
+ * Do what we can while still keeping this reasonably small.
+ * Note: We are assuming the ut_id[] size is fixed at 4. */
+
+#if defined UT_LINESIZE \
+	&& ((UT_LINESIZE != 32) || (UT_NAMESIZE != 32) || (UT_HOSTSIZE != 256))
+#error struct utmp member char[] size(s) have changed!
+#elif defined __UT_LINESIZE \
+	&& ((__UT_LINESIZE != 32) || (__UT_NAMESIZE != 64) || (__UT_HOSTSIZE != 256))
+#error struct utmp member char[] size(s) have changed!
+#endif
+
+#if EMPTY != 0 || RUN_LVL != 1 || BOOT_TIME != 2 || NEW_TIME != 3 || \
+	OLD_TIME != 4
+#error Values for the ut_type field of struct utmp changed
+#endif
+
+int last_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int last_main(int argc, char **argv UNUSED_PARAM)
+{
+	struct utmp ut;
+	int n, file = STDIN_FILENO;
+	time_t t_tmp;
+	off_t pos;
+	static const char _ut_usr[] ALIGN1 =
+			"runlevel\0" "reboot\0" "shutdown\0";
+	static const char _ut_lin[] ALIGN1 =
+			"~\0" "{\0" "|\0" /* "LOGIN\0" "date\0" */;
+	enum {
+		TYPE_RUN_LVL = RUN_LVL,		/* 1 */
+		TYPE_BOOT_TIME = BOOT_TIME,	/* 2 */
+		TYPE_SHUTDOWN_TIME = SHUTDOWN_TIME
+	};
+	enum {
+		_TILDE = EMPTY,				/* 0 */
+		TYPE_NEW_TIME,	/* NEW_TIME, 3 */
+		TYPE_OLD_TIME	/* OLD_TIME, 4 */
+	};
+
+	if (argc > 1) {
+		bb_show_usage();
+	}
+	file = xopen(bb_path_wtmp_file, O_RDONLY);
+
+	printf("%-10s %-14s %-18s %-12.12s %s\n",
+	       "USER", "TTY", "HOST", "LOGIN", "TIME");
+	/* yikes. We reverse over the file and that is a not too elegant way */
+	pos = xlseek(file, 0, SEEK_END);
+	pos = lseek(file, pos - sizeof(ut), SEEK_SET);
+	while ((n = full_read(file, &ut, sizeof(ut))) > 0) {
+		if (n != sizeof(ut)) {
+			bb_perror_msg_and_die("short read");
+		}
+		n = index_in_strings(_ut_lin, ut.ut_line);
+		if (n == _TILDE) { /* '~' */
+#if 1
+/* do we really need to be cautious here? */
+			n = index_in_strings(_ut_usr, ut.ut_user);
+			if (++n > 0)
+				ut.ut_type = n != 3 ? n : SHUTDOWN_TIME;
+#else
+			if (strncmp(ut.ut_user, "shutdown", 8) == 0)
+				ut.ut_type = SHUTDOWN_TIME;
+			else if (strncmp(ut.ut_user, "reboot", 6) == 0)
+				ut.ut_type = BOOT_TIME;
+			else if (strncmp(ut.ut_user, "runlevel", 8) == 0)
+				ut.ut_type = RUN_LVL;
+#endif
+		} else {
+			if (ut.ut_user[0] == '\0' || strcmp(ut.ut_user, "LOGIN") == 0) {
+				/* Don't bother.  This means we can't find how long
+				 * someone was logged in for.  Oh well. */
+				goto next;
+			}
+			if (ut.ut_type != DEAD_PROCESS
+			 && ut.ut_user[0] && ut.ut_line[0]
+			) {
+				ut.ut_type = USER_PROCESS;
+			}
+			if (strcmp(ut.ut_user, "date") == 0) {
+				if (n == TYPE_OLD_TIME) { /* '|' */
+					ut.ut_type = OLD_TIME;
+				}
+				if (n == TYPE_NEW_TIME) { /* '{' */
+					ut.ut_type = NEW_TIME;
+				}
+			}
+		}
+
+		if (ut.ut_type != USER_PROCESS) {
+			switch (ut.ut_type) {
+				case OLD_TIME:
+				case NEW_TIME:
+				case RUN_LVL:
+				case SHUTDOWN_TIME:
+					goto next;
+				case BOOT_TIME:
+					strcpy(ut.ut_line, "system boot");
+			}
+		}
+		/* manpages say ut_tv.tv_sec *is* time_t,
+		 * but some systems have it wrong */
+		t_tmp = (time_t)ut.ut_tv.tv_sec;
+		printf("%-10s %-14s %-18s %-12.12s\n",
+		       ut.ut_user, ut.ut_line, ut.ut_host, ctime(&t_tmp) + 4);
+ next:
+		pos -= sizeof(ut);
+		if (pos <= 0)
+			break; /* done. */
+		xlseek(file, pos, SEEK_SET);
+	}
+
+	fflush_stdout_and_exit(EXIT_SUCCESS);
+}
-- 
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