add log-login-btmp

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

2 files changed, 168 insertions, 0 deletions

diff --git a/src/common.h b/src/common.h
new file mode 100644
index 0000000..0a1b37f
--- /dev/null
+++ b/src/common.h
@@ -0,0 +1,84 @@
+/**
+ * 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 <string.h>
+#include <time.h>
+#include <sys/time.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+
+
+
+#ifndef VARDIR
+#define VARDIR "/var"
+#endif
+#ifndef LOGDIR
+#define LOGDIR VARDIR "/log"
+#endif
+
+
+
+#define LIST_ARGUMENTS  X(action) X(username) X(ttyname) X(pid) X(hostname)
+#define streq(a, b)     ((a == b) || (a && b && !strcmp(a, b)))
+#define xstrcpy(d, s)   (s ? snprintf(d, sizeof(d) / sizeof(char), "%s", s) : 0)
+#define xmemcpy(d, s)   (s ? memcpy(d, s, sizeof(d)) : 0)
+
+
+
+static inline const char* first_digit(const char* str)
+{
+  for (; str && *str; str++)
+    if (('0' <= *str) && (*str <= '9'))
+      return str;
+  return NULL;
+}
+
+
+static inline const char* get_hostaddress(const char* hostname)
+{
+  static char rc[32 * 4 / 8];
+  struct addrinfo hints;
+  struct addrinfo *info = NULL;
+  
+  if (hostname == NULL)
+    return NULL;
+  
+  memset(rc, 0, sizeof(rc));
+  memset(&hints, 0, sizeof(hints));
+  hints.ai_flags = AI_ADDRCONFIG;
+  
+  if (getaddrinfo(hostname, NULL, &hints, &info))  return NULL;
+  if (info == NULL)                                return NULL;
+  
+  if (info->ai_family == AF_INET)
+    {
+      struct sockaddr_in* addr = (struct sockaddr_in*)(info->ai_addr);
+      memcpy(rc, &(addr->sin_addr), sizeof(addr->sin_addr));
+    }
+  else if (info->ai_family == AF_INET6)
+    {
+      struct sockaddr_in6* addr = (struct sockaddr_in6*)(info->ai_addr);
+      memcpy(rc, &(addr->sin6_addr), sizeof(addr->sin6_addr));
+    }
+  
+  freeaddrinfo(info);
+  return rc;
+}
+
diff --git a/src/log-login-btmp.c b/src/log-login-btmp.c
new file mode 100644
index 0000000..35b2b31
--- /dev/null
+++ b/src/log-login-btmp.c
@@ -0,0 +1,84 @@
+/**
+ * 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, "failed"))  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;
+  memset(&ut, 0, sizeof(struct utmp));
+  
+  ut.ut_type = LOGIN_PROCESS;
+  ut.ut_pid = (pid_t)atoll(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
+  
+  updwtmp(LOGDIR "/btmp", &ut);
+  return 0;
+}
+