add log-login-utmp

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 116 insertions, 0 deletions

diff --git a/src/log-login-utmp.c b/src/log-login-utmp.c
new file mode 100644
index 0000000..c696243
--- /dev/null
+++ b/src/log-login-utmp.c
@@ -0,0 +1,116 @@
+/**
+ * cerberus-logging – Log-in logging extension for cerberus
+ * 
+ * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "common.h"
+
+#include <utmp.h>
+
+
+
+#define X(A)  static const char* A = NULL;
+  LIST_ARGUMENTS
+#undef X
+
+
+static int log_action(void);
+
+
+int main(int argc, char** argv)
+{
+  int i;
+  
+  for (i = 1; i < argc; i++)
+    {
+#define X(A)  if (strstr(argv[i], "--" #A "="))  A = strchr(argv[i], '=') + 1;
+      LIST_ARGUMENTS
+#undef X
+    }
+  
+  if (!streq(action, "login"))  return 0;
+  if (NULL == username)         return 1;
+  if (NULL == ttyname)          return 1;
+  if (NULL == pid)              return 1;
+  
+  return -log_action();
+}
+
+
+static int log_action(void)
+{
+  struct utmp ut;
+  struct utmp *entry;
+  pid_t pid_ = (pid_t)atoll(pid);
+  const char* ttyno = first_digit(ttyname);
+  
+  memset(&ut, 0, sizeof(struct utmp));
+  
+  utmpname(_PATH_UTMP);
+  setutent();
+  
+  while ((entry = getutent()))
+    if (entry->ut_pid == pid_)
+      if ((INIT_PROCESS <= entry->ut_type) && (entry->ut_type <= DEAD_PROCESS))
+	break;
+  
+  if ((entry == NULL) && ttyname)
+    {
+      setutent();
+      ut.ut_type = LOGIN_PROCESS;
+      xstrcpy(ut.ut_line, ttyname);
+      entry = getutline(&ut);
+    }
+  if ((entry == NULL) && ttyno)
+    {
+      setutent();
+      ut.ut_type = DEAD_PROCESS;
+      xstrcpy(ut.ut_id, ttyno);
+      entry = getutline(&ut);
+    }
+  
+  if (entry)  memcpy(&ut, entry, sizeof(struct utmp));
+  else        memset(&ut, 0,     sizeof(struct utmp));
+  
+  ut.ut_type = USER_PROCESS;
+  ut.ut_pid = pid_;
+  xstrcpy(ut.ut_user, username);
+  xstrcpy(ut.ut_host, hostname);
+  xstrcpy(ut.ut_line, ttyname);
+  xstrcpy(ut.ut_id, first_digit(ttyname));
+  xmemcpy(ut.ut_addr_v6, get_hostaddress(hostname));
+  
+#ifdef _HAVE_UT_TV
+  {
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    ut.ut_tv.tv_sec = tv.tv_sec;
+    ut.ut_tv.tv_usec = tv.tv_usec;
+  }
+#else
+  {
+    time_t t;
+    time(&t);
+    ut.ut_time = t;
+  }
+#endif
+
+  pututline(&ut);
+  endutent();
+  updwtmp(_PATH_WTMP, &ut);
+  return 0;
+}
+