mergegcc9

1 files changed, 132 insertions, 0 deletions

diff --git a/usr/src/lib/libutempter/common/utempter.c b/usr/src/lib/libutempter/common/utempter.c
new file mode 100644
index 0000000000..63e6b24ba1
--- /dev/null
+++ b/usr/src/lib/libutempter/common/utempter.c
@@ -0,0 +1,132 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2009 Ed Schouten <ed@FreeBSD.org>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <sys/types.h>
+
+#include <pwd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <utmpx.h>
+
+static int last_fd = -1;
+
+static void
+utempter_update_utmpx(int type, int fd, const char *host)
+{
+	struct utmpx ut;
+	struct passwd *pw;
+	uid_t uid;
+
+	(void) memset(&ut, 0, sizeof (ut));
+	ut.ut_type = type;
+	ut.ut_pid = getpid();
+	ut.ut_session = getsid(0);
+	(void) gettimeofday(&ut.ut_tv, NULL);
+	if (snprintf(ut.ut_id, sizeof (ut.ut_id), "f%d", fd) >=
+	    sizeof (ut.ut_id))
+		return;
+	uid = getuid();
+	if ((pw = getpwuid(uid)) == NULL)
+		return;
+	(void) strlcpy(ut.ut_user, pw->pw_name, sizeof (ut.ut_user));
+
+	if (type == DEAD_PROCESS) {
+		struct utmpx *ut1;
+		struct utmpx ut2;
+
+		(void) memset(&ut2, 0, sizeof (ut2));
+		ut2.ut_type = USER_PROCESS;
+		if (snprintf(ut2.ut_id, sizeof (ut2.ut_id), "f%d", fd) >=
+		    sizeof (ut2.ut_id))
+			return;
+		if ((ut1 = getutxid(&ut2)) == NULL)
+			return;
+		(void) strlcpy(ut.ut_line, ut1->ut_line, sizeof (ut.ut_line));
+	} else {
+		char *line = ptsname(fd);
+		if (line == NULL)
+			return;
+		(void) strlcpy(ut.ut_line, line + strlen("/dev/"),
+		    sizeof (ut.ut_line));
+	}
+
+	if (host != NULL) {
+		(void) strlcpy(ut.ut_host, host, sizeof (ut.ut_host));
+		ut.ut_syslen = strlen(ut.ut_host) + 1;
+	}
+
+	setutxent();
+	(void) pututxline(&ut);
+	endutxent();
+}
+
+int
+utempter_add_record(int fd, const char *host)
+{
+	utempter_update_utmpx(USER_PROCESS, fd, host);
+	last_fd = fd;
+	return (0);
+}
+
+int
+utempter_remove_record(int fd)
+{
+	utempter_update_utmpx(DEAD_PROCESS, fd, NULL);
+	if (last_fd == fd)
+		last_fd = -1;
+	return (0);
+}
+
+int
+utempter_remove_added_record(void)
+{
+	if (last_fd < 0)
+		return (0);
+	utempter_update_utmpx(DEAD_PROCESS, last_fd, NULL);
+	last_fd = -1;
+	return (0);
+}
+
+void
+addToUtmp(const char *pty __unused, const char *host, int fd)
+{
+	(void) utempter_add_record(fd, host);
+}
+
+void
+removeFromUtmp(void)
+{
+	(void) utempter_remove_added_record();
+}
+
+void
+removeLineFromUtmp(const char *pty __unused, int fd)
+{
+	(void) utempter_remove_record(fd);
+}