Adding upstream version 1:4.13+dfsg1.upstream/1%4.13+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 474 insertions, 0 deletions

diff --git a/libmisc/utmp.c b/libmisc/utmp.c
new file mode 100644
index 0000000..45b479f
--- /dev/null
+++ b/libmisc/utmp.c
@@ -0,0 +1,474 @@
+/*
+ * SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1999, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2008 - 2009, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#include "defines.h"
+#include "prototypes.h"
+
+#ifdef USE_UTMPX
+#include <utmpx.h>
+#else
+#include <utmp.h>
+#endif
+
+#include <assert.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <stdio.h>
+
+#ident "$Id$"
+
+
+/*
+ * is_my_tty -- determine if "tty" is the same TTY stdin is using
+ */
+static bool is_my_tty (const char *tty)
+{
+	/* full_tty shall be at least sizeof utmp.ut_line + 5 */
+	char full_tty[200];
+	/* tmptty shall be bigger than full_tty */
+	static char tmptty[sizeof (full_tty)+1];
+
+	if ('/' != *tty) {
+		(void) snprintf (full_tty, sizeof full_tty, "/dev/%s", tty);
+		tty = &full_tty[0];
+	}
+
+	if ('\0' == tmptty[0]) {
+		const char *tname = ttyname (STDIN_FILENO);
+		if (NULL != tname) {
+			(void) strncpy (tmptty, tname, sizeof tmptty);
+			tmptty[sizeof (tmptty) - 1] = '\0';
+		}
+	}
+
+	if ('\0' == tmptty[0]) {
+		(void) puts (_("Unable to determine your tty name."));
+		exit (EXIT_FAILURE);
+	} else if (strncmp (tty, tmptty, sizeof (tmptty)) != 0) {
+		return false;
+	} else {
+		return true;
+	}
+}
+
+/*
+ * get_current_utmp - return the most probable utmp entry for the current
+ *                    session
+ *
+ *	The utmp file is scanned for an entry with the same process ID.
+ *	The line entered by the *getty / telnetd, etc. should also match
+ *	the current terminal.
+ *
+ *	When an entry is returned by get_current_utmp, and if the utmp
+ *	structure has a ut_id field, this field should be used to update
+ *	the entry information.
+ *
+ *	Return NULL if no entries exist in utmp for the current process.
+ */
+#ifndef USE_UTMPX
+/*@null@*/ /*@only@*/struct utmp *get_current_utmp (void)
+{
+	struct utmp *ut;
+	struct utmp *ret = NULL;
+
+	setutent ();
+
+	/* First, try to find a valid utmp entry for this process.  */
+	while ((ut = getutent ()) != NULL) {
+		if (   (ut->ut_pid == getpid ())
+#ifdef HAVE_STRUCT_UTMP_UT_ID
+		    && ('\0' != ut->ut_id[0])
+#endif
+#ifdef HAVE_STRUCT_UTMP_UT_TYPE
+		    && (   (LOGIN_PROCESS == ut->ut_type)
+		        || (USER_PROCESS  == ut->ut_type))
+#endif
+		    /* A process may have failed to close an entry
+		     * Check if this entry refers to the current tty */
+		    && is_my_tty (ut->ut_line)) {
+			break;
+		}
+	}
+
+	if (NULL != ut) {
+		ret = (struct utmp *) xmalloc (sizeof (*ret));
+		memcpy (ret, ut, sizeof (*ret));
+	}
+
+	endutent ();
+
+	return ret;
+}
+#else
+/*@null@*/ /*@only*/struct utmpx *get_current_utmp(void)
+{
+	struct utmpx *ut;
+	struct utmpx *ret = NULL;
+
+	setutxent ();
+
+	/* Find the utmpx entry for this PID. */
+	while ((ut = getutxent ()) != NULL) {
+		if (   (ut->ut_pid == getpid ())
+		    && ('\0' != ut->ut_id[0])
+		    && (   (LOGIN_PROCESS == ut->ut_type)
+			|| (USER_PROCESS == ut->ut_type))
+		    && is_my_tty (ut->ut_line)) {
+			break;
+		}
+	}
+
+	if (NULL != ut) {
+		ret = (struct utmpx *) xmalloc (sizeof (*ret));
+		memcpy (ret, ut, sizeof (*ret));
+	}
+
+	endutxent ();
+
+	return ret;
+}
+#endif
+
+
+#ifndef USE_PAM
+/*
+ * Some systems already have updwtmp() and possibly updwtmpx().  Others
+ * don't, so we re-implement these functions if necessary.
+ */
+#ifndef HAVE_UPDWTMP
+static void updwtmp (const char *filename, const struct utmp *ut)
+{
+	int fd;
+
+	fd = open (filename, O_APPEND | O_WRONLY, 0);
+	if (fd >= 0) {
+		write (fd, (const char *) ut, sizeof (*ut));
+		close (fd);
+	}
+}
+#endif				/* ! HAVE_UPDWTMP */
+
+#ifdef USE_UTMPX
+#ifndef HAVE_UPDWTMPX
+static void updwtmpx (const char *filename, const struct utmpx *utx)
+{
+	int fd;
+
+	fd = open (filename, O_APPEND | O_WRONLY, 0);
+	if (fd >= 0) {
+		write (fd, (const char *) utx, sizeof (*utx));
+		close (fd);
+	}
+}
+#endif				/* ! HAVE_UPDWTMPX */
+#endif				/* ! USE_UTMPX */
+#endif				/* ! USE_PAM */
+
+
+#ifndef USE_UTMPX
+/*
+ * prepare_utmp - prepare an utmp entry so that it can be logged in a
+ *                utmp/wtmp file.
+ *
+ *	It accepts an utmp entry in input (ut) to return an entry with
+ *	the right ut_id. This is typically an entry returned by
+ *	get_current_utmp
+ *	If ut is NULL, ut_id will be forged based on the line argument.
+ *
+ *	The ut_host field of the input structure may also be kept, and is
+ *	used to define the ut_addr/ut_addr_v6 fields. (if these fields
+ *	exist)
+ *
+ *	Other fields are discarded and filed with new values (if they
+ *	exist).
+ *
+ *	The returned structure shall be freed by the caller.
+ */
+/*@only@*/struct utmp *prepare_utmp (const char *name,
+                                     const char *line,
+                                     const char *host,
+                                     /*@null@*/const struct utmp *ut)
+{
+	struct timeval tv;
+	char *hostname = NULL;
+	struct utmp *utent;
+
+	assert (NULL != name);
+	assert (NULL != line);
+
+
+
+	if (   (NULL != host)
+	    && ('\0' != host[0])) {
+		hostname = (char *) xmalloc (strlen (host) + 1);
+		strcpy (hostname, host);
+#ifdef HAVE_STRUCT_UTMP_UT_HOST
+	} else if (   (NULL != ut)
+	           && ('\0' != ut->ut_host[0])) {
+		hostname = (char *) xmalloc (sizeof (ut->ut_host) + 1);
+		strncpy (hostname, ut->ut_host, sizeof (ut->ut_host));
+		hostname[sizeof (ut->ut_host)] = '\0';
+#endif				/* HAVE_STRUCT_UTMP_UT_HOST */
+	}
+
+	if (strncmp(line, "/dev/", 5) == 0) {
+		line += 5;
+	}
+
+
+	utent = (struct utmp *) xmalloc (sizeof (*utent));
+	memzero (utent, sizeof (*utent));
+
+
+
+#ifdef HAVE_STRUCT_UTMP_UT_TYPE
+	utent->ut_type = USER_PROCESS;
+#endif				/* HAVE_STRUCT_UTMP_UT_TYPE */
+	utent->ut_pid = getpid ();
+	strncpy (utent->ut_line, line,      sizeof (utent->ut_line) - 1);
+#ifdef HAVE_STRUCT_UTMP_UT_ID
+	if (NULL != ut) {
+		strncpy (utent->ut_id, ut->ut_id, sizeof (utent->ut_id));
+	} else {
+		/* XXX - assumes /dev/tty?? */
+		strncpy (utent->ut_id, line + 3, sizeof (utent->ut_id) - 1);
+	}
+#endif				/* HAVE_STRUCT_UTMP_UT_ID */
+#ifdef HAVE_STRUCT_UTMP_UT_NAME
+	strncpy (utent->ut_name, name,      sizeof (utent->ut_name));
+#endif				/* HAVE_STRUCT_UTMP_UT_NAME */
+#ifdef HAVE_STRUCT_UTMP_UT_USER
+	strncpy (utent->ut_user, name,      sizeof (utent->ut_user) - 1);
+#endif				/* HAVE_STRUCT_UTMP_UT_USER */
+	if (NULL != hostname) {
+		struct addrinfo *info = NULL;
+#ifdef HAVE_STRUCT_UTMP_UT_HOST
+		strncpy (utent->ut_host, hostname, sizeof (utent->ut_host) - 1);
+#endif				/* HAVE_STRUCT_UTMP_UT_HOST */
+#ifdef HAVE_STRUCT_UTMP_UT_SYSLEN
+		utent->ut_syslen = MIN (strlen (hostname),
+		                        sizeof (utent->ut_host));
+#endif				/* HAVE_STRUCT_UTMP_UT_SYSLEN */
+#if defined(HAVE_STRUCT_UTMP_UT_ADDR) || defined(HAVE_STRUCT_UTMP_UT_ADDR_V6)
+		if (getaddrinfo (hostname, NULL, NULL, &info) == 0) {
+			/* getaddrinfo might not be reliable.
+			 * Just try to log what may be useful.
+			 */
+			if (info->ai_family == AF_INET) {
+				struct sockaddr_in *sa =
+					(struct sockaddr_in *) info->ai_addr;
+#ifdef HAVE_STRUCT_UTMP_UT_ADDR
+				memcpy (&(utent->ut_addr),
+				        &(sa->sin_addr),
+				        MIN (sizeof (utent->ut_addr),
+				             sizeof (sa->sin_addr)));
+#endif				/* HAVE_STRUCT_UTMP_UT_ADDR */
+#ifdef HAVE_STRUCT_UTMP_UT_ADDR_V6
+				memcpy (utent->ut_addr_v6,
+				        &(sa->sin_addr),
+				        MIN (sizeof (utent->ut_addr_v6),
+				             sizeof (sa->sin_addr)));
+			} else if (info->ai_family == AF_INET6) {
+				struct sockaddr_in6 *sa =
+					(struct sockaddr_in6 *) info->ai_addr;
+				memcpy (utent->ut_addr_v6,
+				        &(sa->sin6_addr),
+				        MIN (sizeof (utent->ut_addr_v6),
+				             sizeof (sa->sin6_addr)));
+#endif				/* HAVE_STRUCT_UTMP_UT_ADDR_V6 */
+			}
+			freeaddrinfo (info);
+		}
+#endif		/* HAVE_STRUCT_UTMP_UT_ADDR || HAVE_STRUCT_UTMP_UT_ADDR_V6 */
+		free (hostname);
+	}
+	/* ut_exit is only for DEAD_PROCESS */
+	utent->ut_session = getsid (0);
+	if (gettimeofday (&tv, NULL) == 0) {
+#ifdef HAVE_STRUCT_UTMP_UT_TIME
+		utent->ut_time = tv.tv_sec;
+#endif				/* HAVE_STRUCT_UTMP_UT_TIME */
+#ifdef HAVE_STRUCT_UTMP_UT_XTIME
+		utent->ut_xtime = tv.tv_usec;
+#endif				/* HAVE_STRUCT_UTMP_UT_XTIME */
+#ifdef HAVE_STRUCT_UTMP_UT_TV
+		utent->ut_tv.tv_sec  = tv.tv_sec;
+		utent->ut_tv.tv_usec = tv.tv_usec;
+#endif				/* HAVE_STRUCT_UTMP_UT_TV */
+	}
+
+	return utent;
+}
+
+/*
+ * setutmp - Update an entry in utmp and log an entry in wtmp
+ *
+ *	Return 1 on failure and 0 on success.
+ */
+int setutmp (struct utmp *ut)
+{
+	int err = 0;
+
+	assert (NULL != ut);
+
+	setutent ();
+	if (pututline (ut) == NULL) {
+		err = 1;
+	}
+	endutent ();
+
+#ifndef USE_PAM
+	/* This is done by pam_lastlog */
+	updwtmp (_WTMP_FILE, ut);
+#endif				/* ! USE_PAM */
+
+	return err;
+}
+
+#else
+/*
+ * prepare_utmpx - the UTMPX version for prepare_utmp
+ */
+/*@only@*/struct utmpx *prepare_utmpx (const char *name,
+                                       const char *line,
+                                       const char *host,
+                                       /*@null@*/const struct utmpx *ut)
+{
+	struct timeval tv;
+	char *hostname = NULL;
+	struct utmpx *utxent;
+
+	assert (NULL != name);
+	assert (NULL != line);
+
+
+
+	if (   (NULL != host)
+	    && ('\0' != host[0])) {
+		hostname = (char *) xmalloc (strlen (host) + 1);
+		strcpy (hostname, host);
+#ifdef HAVE_STRUCT_UTMP_UT_HOST
+	} else if (   (NULL != ut)
+	           && (NULL != ut->ut_host)
+	           && ('\0' != ut->ut_host[0])) {
+		hostname = (char *) xmalloc (sizeof (ut->ut_host) + 1);
+		strncpy (hostname, ut->ut_host, sizeof (ut->ut_host));
+		hostname[sizeof (ut->ut_host)] = '\0';
+#endif				/* HAVE_STRUCT_UTMP_UT_TYPE */
+	}
+
+	if (strncmp(line, "/dev/", 5) == 0) {
+		line += 5;
+	}
+
+	utxent = (struct utmpx *) xmalloc (sizeof (*utxent));
+	memzero (utxent, sizeof (*utxent));
+
+
+
+	utxent->ut_type = USER_PROCESS;
+	utxent->ut_pid = getpid ();
+	strncpy (utxent->ut_line, line,      sizeof (utxent->ut_line));
+	/* existence of ut->ut_id is enforced by configure */
+	if (NULL != ut) {
+		strncpy (utxent->ut_id, ut->ut_id, sizeof (utxent->ut_id));
+	} else {
+		/* XXX - assumes /dev/tty?? */
+		strncpy (utxent->ut_id, line + 3, sizeof (utxent->ut_id));
+	}
+#ifdef HAVE_STRUCT_UTMPX_UT_NAME
+	strncpy (utxent->ut_name, name,      sizeof (utxent->ut_name));
+#endif				/* HAVE_STRUCT_UTMPX_UT_NAME */
+	strncpy (utxent->ut_user, name,      sizeof (utxent->ut_user));
+	if (NULL != hostname) {
+		struct addrinfo *info = NULL;
+#ifdef HAVE_STRUCT_UTMPX_UT_HOST
+		strncpy (utxent->ut_host, hostname, sizeof (utxent->ut_host));
+#endif				/* HAVE_STRUCT_UTMPX_UT_HOST */
+#ifdef HAVE_STRUCT_UTMPX_UT_SYSLEN
+		utxent->ut_syslen = MIN (strlen (hostname),
+		                         sizeof (utxent->ut_host));
+#endif				/* HAVE_STRUCT_UTMPX_UT_SYSLEN */
+#if defined(HAVE_STRUCT_UTMPX_UT_ADDR) || defined(HAVE_STRUCT_UTMPX_UT_ADDR_V6)
+		if (getaddrinfo (hostname, NULL, NULL, &info) == 0) {
+			/* getaddrinfo might not be reliable.
+			 * Just try to log what may be useful.
+			 */
+			if (info->ai_family == AF_INET) {
+				struct sockaddr_in *sa =
+					(struct sockaddr_in *) info->ai_addr;
+#ifdef HAVE_STRUCT_UTMPX_UT_ADDR
+				memcpy (&utxent->ut_addr,
+				        &(sa->sin_addr),
+				        MIN (sizeof (utxent->ut_addr),
+				             sizeof (sa->sin_addr)));
+#endif				/* HAVE_STRUCT_UTMPX_UT_ADDR */
+#ifdef HAVE_STRUCT_UTMPX_UT_ADDR_V6
+				memcpy (utxent->ut_addr_v6,
+				        &(sa->sin_addr),
+				        MIN (sizeof (utxent->ut_addr_v6),
+				             sizeof (sa->sin_addr)));
+			} else if (info->ai_family == AF_INET6) {
+				struct sockaddr_in6 *sa =
+					(struct sockaddr_in6 *) info->ai_addr;
+				memcpy (utxent->ut_addr_v6,
+				        &(sa->sin6_addr),
+				        MIN (sizeof (utxent->ut_addr_v6),
+				             sizeof (sa->sin6_addr)));
+#endif				/* HAVE_STRUCT_UTMPX_UT_ADDR_V6 */
+			}
+			freeaddrinfo (info);
+		}
+#endif		/* HAVE_STRUCT_UTMPX_UT_ADDR || HAVE_STRUCT_UTMPX_UT_ADDR_V6 */
+		free (hostname);
+	}
+	/* ut_exit is only for DEAD_PROCESS */
+	utxent->ut_session = getsid (0);
+	if (gettimeofday (&tv, NULL) == 0) {
+#ifdef HAVE_STRUCT_UTMPX_UT_TIME
+		utxent->ut_time = tv.tv_sec;
+#endif				/* HAVE_STRUCT_UTMPX_UT_TIME */
+#ifdef HAVE_STRUCT_UTMPX_UT_XTIME
+		utxent->ut_xtime = tv.tv_usec;
+#endif				/* HAVE_STRUCT_UTMPX_UT_XTIME */
+		utxent->ut_tv.tv_sec  = tv.tv_sec;
+		utxent->ut_tv.tv_usec = tv.tv_usec;
+	}
+
+	return utxent;
+}
+
+/*
+ * setutmpx - the UTMPX version for setutmp
+ */
+int setutmpx (struct utmpx *utx)
+{
+	int err = 0;
+
+	assert (NULL != utx);
+
+	setutxent ();
+	if (pututxline (utx) == NULL) {
+		err = 1;
+	}
+	endutxent ();
+
+#ifndef USE_PAM
+	/* This is done by pam_lastlog */
+	updwtmpx (_WTMP_FILE "x", utx);
+#endif				/* ! USE_PAM */
+
+	return err;
+}
+#endif				/* USE_UTMPX */
+