Vendor import of OpenSSH.

1 files changed, 124 insertions, 0 deletions

diff --git a/crypto/openssh/login.c b/crypto/openssh/login.c
new file mode 100644
index 0000000..574a9cc
--- /dev/null
+++ b/crypto/openssh/login.c
@@ -0,0 +1,124 @@
+/*
+ * 
+ * login.c
+ * 
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * 
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ * 
+ * Created: Fri Mar 24 14:51:08 1995 ylo
+ * 
+ * This file performs some of the things login(1) normally does.  We cannot
+ * easily use something like login -p -h host -f user, because there are
+ * several different logins around, and it is hard to determined what kind of
+ * login the current system has.  Also, we want to be able to execute commands
+ * on a tty.
+ * 
+ */
+
+#include "includes.h"
+RCSID("$Id: login.c,v 1.11 2000/01/04 00:07:59 markus Exp $");
+
+#include <util.h>
+#include <utmp.h>
+#include "ssh.h"
+
+/*
+ * Returns the time when the user last logged in.  Returns 0 if the
+ * information is not available.  This must be called before record_login.
+ * The host the user logged in from will be returned in buf.
+ */
+
+/*
+ * Returns the time when the user last logged in (or 0 if no previous login
+ * is found).  The name of the host used last time is returned in buf.
+ */
+
+unsigned long 
+get_last_login_time(uid_t uid, const char *logname,
+		    char *buf, unsigned int bufsize)
+{
+	struct lastlog ll;
+	char *lastlog;
+	int fd;
+
+	lastlog = _PATH_LASTLOG;
+	buf[0] = '\0';
+
+	fd = open(lastlog, O_RDONLY);
+	if (fd < 0)
+		return 0;
+	lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
+	if (read(fd, &ll, sizeof(ll)) != sizeof(ll)) {
+		close(fd);
+		return 0;
+	}
+	close(fd);
+	if (bufsize > sizeof(ll.ll_host) + 1)
+		bufsize = sizeof(ll.ll_host) + 1;
+	strncpy(buf, ll.ll_host, bufsize - 1);
+	buf[bufsize - 1] = 0;
+	return ll.ll_time;
+}
+
+/*
+ * Records that the user has logged in.  I these parts of operating systems
+ * were more standardized.
+ */
+
+void 
+record_login(int pid, const char *ttyname, const char *user, uid_t uid,
+	     const char *host, struct sockaddr * addr)
+{
+	int fd;
+	struct lastlog ll;
+	char *lastlog;
+	struct utmp u;
+	const char *utmp, *wtmp;
+
+	/* Construct an utmp/wtmp entry. */
+	memset(&u, 0, sizeof(u));
+	strncpy(u.ut_line, ttyname + 5, sizeof(u.ut_line));
+	u.ut_time = time(NULL);
+	strncpy(u.ut_name, user, sizeof(u.ut_name));
+	strncpy(u.ut_host, host, sizeof(u.ut_host));
+
+	/* Figure out the file names. */
+	utmp = _PATH_UTMP;
+	wtmp = _PATH_WTMP;
+
+	login(&u);
+	lastlog = _PATH_LASTLOG;
+
+	/* Update lastlog unless actually recording a logout. */
+	if (strcmp(user, "") != 0) {
+		/*
+		 * It is safer to bzero the lastlog structure first because
+		 * some systems might have some extra fields in it (e.g. SGI)
+		 */
+		memset(&ll, 0, sizeof(ll));
+
+		/* Update lastlog. */
+		ll.ll_time = time(NULL);
+		strncpy(ll.ll_line, ttyname + 5, sizeof(ll.ll_line));
+		strncpy(ll.ll_host, host, sizeof(ll.ll_host));
+		fd = open(lastlog, O_RDWR);
+		if (fd >= 0) {
+			lseek(fd, (off_t) ((long) uid * sizeof(ll)), SEEK_SET);
+			if (write(fd, &ll, sizeof(ll)) != sizeof(ll))
+				log("Could not write %.100s: %.100s", lastlog, strerror(errno));
+			close(fd);
+		}
+	}
+}
+
+/* Records that the user has logged out. */
+
+void 
+record_logout(int pid, const char *ttyname)
+{
+	const char *line = ttyname + 5;	/* /dev/ttyq8 -> ttyq8 */
+	if (logout(line))
+		logwtmp(line, "", "");
+}