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-rw-r--r--lib/log.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/lib/log.c b/lib/log.c
new file mode 100644
index 0000000..9f54d45
--- /dev/null
+++ b/lib/log.c
@@ -0,0 +1,109 @@
+/*
+ * SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1998, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008 , Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <sys/types.h>
+#include <pwd.h>
+#include <fcntl.h>
+#include <time.h>
+#include "defines.h"
+#include <lastlog.h>
+#include "memzero.h"
+#include "prototypes.h"
+#include "string/strncpy.h"
+#include "string/strtcpy.h"
+
+
+/*
+ * dolastlog - create lastlog entry
+ *
+ * A "last login" entry is created for the user being logged in. The
+ * UID is extracted from the global (struct passwd) entry and the
+ * TTY information is gotten from the (struct utmpx).
+ */
+void dolastlog (
+ struct lastlog *ll,
+ const struct passwd *pw,
+ /*@unique@*/const char *line,
+ /*@unique@*/const char *host)
+{
+ int fd;
+ off_t offset;
+ struct lastlog newlog;
+ time_t ll_time;
+
+ /*
+ * If the file does not exist, don't create it.
+ */
+
+ fd = open (LASTLOG_FILE, O_RDWR);
+ if (-1 == fd) {
+ return;
+ }
+
+ /*
+ * The file is indexed by UID number. Seek to the record
+ * for this UID. Negative UID's will create problems, but ...
+ */
+
+ offset = (off_t) pw->pw_uid * sizeof newlog;
+
+ if (lseek (fd, offset, SEEK_SET) != offset) {
+ SYSLOG ((LOG_WARN,
+ "Can't read last lastlog entry for UID %lu in %s. Entry not updated.",
+ (unsigned long) pw->pw_uid, LASTLOG_FILE));
+ (void) close (fd);
+ return;
+ }
+
+ /*
+ * Read the old entry so we can tell the user when they last
+ * logged in. Then construct the new entry and write it out
+ * the way we read the old one in.
+ */
+
+ if (read (fd, &newlog, sizeof newlog) != (ssize_t) sizeof newlog) {
+ memzero (&newlog, sizeof newlog);
+ }
+ if (NULL != ll) {
+ *ll = newlog;
+ }
+
+ ll_time = newlog.ll_time;
+ (void) time (&ll_time);
+ newlog.ll_time = ll_time;
+ STRTCPY(newlog.ll_line, line);
+#if HAVE_LL_HOST
+ STRNCPY(newlog.ll_host, host);
+#endif
+ if ( (lseek (fd, offset, SEEK_SET) != offset)
+ || (write_full(fd, &newlog, sizeof newlog) == -1)) {
+ goto err_write;
+ }
+
+ if (close (fd) != 0 && errno != EINTR) {
+ goto err_close;
+ }
+
+ return;
+
+err_write:
+ {
+ int saved_errno = errno;
+ (void) close (fd);
+ errno = saved_errno;
+ }
+err_close:
+ SYSLOG ((LOG_WARN,
+ "Can't write lastlog entry for UID %lu in %s: %m",
+ (unsigned long) pw->pw_uid, LASTLOG_FILE));
+}