Initial support for utmp/wtmp on linux

sesman/sesexec/session.c

@@ -656,6 +656,9 @@ session_start_wrapped(struct login_info *login_info,
             }
             else
             {
+                utmp_login(window_manager_pid,
+                           s->display, login_info->username,
+                           login_info->ip_addr);
                 LOG(LOG_LEVEL_INFO,
                     "Starting the xrdp channel server for display :%d",
                     s->display);
@@ -886,6 +889,8 @@ session_process_child_exit(struct session_data *sd,
                 sd->win_mgr, sd->params.display, wm_wait_time);
         }
 
+        utmp_logout(sd->win_mgr, sd->params.display, g_login_info->username,
+                    g_login_info->ip_addr);
         sd->win_mgr = -1;
 
         if (sd->x_server > 0)

sesman/sesexec/utmp.c

@@ -0,0 +1,95 @@
+/**
+ * xrdp: A Remote Desktop Protocol server.
+ *
+ * Copyright (C) Emmanuel Blindauer 2017
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ *
+ * @file utmp.c
+ * @brief utmp/wtmp handling code
+ *
+ */
+
+#if defined(HAVE_CONFIG_H)
+#include <config_ac.h>
+#endif
+
+#include <string.h>
+#include <stdlib.h>
+#include <pwd.h>
+#include <unistd.h>
+#include <stdio.h>
+#include "log.h"
+
+#include <utmp.h>
+#include <utmpx.h>
+
+/* 
+ * Prepare the utmpx struct and write it.
+ * this can handle login and logout at once with the 'state' parameter
+ */
+
+int
+add_xtmp_entry(int pid, const char *line, const char *user, const char *rhostname, short state)
+{
+    struct utmpx ut;
+    struct timeval tv;
+
+    memset (&ut, 0, sizeof (ut));
+
+    ut.ut_type=state;
+    ut.ut_pid = pid;
+    gettimeofday(&tv, NULL);
+    ut.ut_tv.tv_sec = tv.tv_sec;
+    ut.ut_tv.tv_usec = tv.tv_usec;
+    strncpy(ut.ut_line, line , sizeof (ut.ut_line));  
+    strncpy(ut.ut_user, user , sizeof (ut.ut_user));  
+    strncpy(ut.ut_host, rhostname, sizeof (ut.ut_host));
+
+    /* utmp */
+    setutxent();  
+    pututxline(&ut);
+    endutxent ();
+
+    /* wtmp XXX hardcoded! */
+    updwtmpx("/var/log/wtmp", &ut);
+
+    return 0;
+}
+
+int 
+utmp_login(int pid, int display, const char *user, const char *rhostname)
+{
+    char str_display[16];
+
+    log_message(LOG_LEVEL_DEBUG, 
+            "adding login info for utmp/wtmp: %d - %d - %s - %s", 
+            pid, display, user, rhostname);
+    g_snprintf(str_display, 15, XRDP_LINE_FORMAT, display);
+    return add_xtmp_entry(pid, str_display, user, rhostname, USER_PROCESS);
+}
+
+int 
+utmp_logout(int pid, int display, const char *user, const char *rhostname)
+{
+    char str_display[16];
+
+    log_message(LOG_LEVEL_DEBUG, 
+            "adding logout info for utmp/wtmp: %d - %d - %s - %s", 
+            pid, display, user, rhostname);
+    g_snprintf(str_display, 15, XRDP_LINE_FORMAT, display);
+    return add_xtmp_entry(pid, str_display, user, rhostname, DEAD_PROCESS);
+}

sesman/sesexec/utmp.h

@@ -0,0 +1,44 @@
+/**
+ * xrdp: A Remote Desktop Protocol server.
+ *
+ * Copyright (C) Emmanuel Blindauer 2017
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ *
+ * @file utmp.h
+ * @brief utmp/wtmp handling code
+ *
+ */
+
+#ifndef UTMP_H
+#define UTMP_H
+
+#define XRDP_LINE_FORMAT "xrdp:%d"
+/**
+ *
+ * @brief 
+ *       
+ * @param pid
+ * @return 0 
+ */
+
+int add_xtmp_entry(int pid, const char *line, const char *user, const char *rhostname, short state);
+
+int utmp_login(int pid, int display, const char *user, const char *rhostname);
+
+int utmp_logout(int pid, int display, const char *user, const char *rhostname);
+
+#endif