src/tcpwrap.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <sys/socket.h>
  23 #include <sys/un.h>
  24 #include <arpa/inet.h>
  25 #include <netinet/in.h>
  26
  27 #ifdef HAVE_LIBWRAP
  28 #include <tcpd.h>
  29 #endif
  30
  31 #include "tcpwrap.h"
  32 #include "log.h"
  33
  34 bool socket_tcpwrap(int fd, const char *name) {
  35 #ifdef HAVE_LIBWRAP
  36         struct request_info req;
  37         union {
  38                 struct sockaddr sa;
  39                 struct sockaddr_in in;
  40                 struct sockaddr_in6 in6;
  41                 struct sockaddr_un un;
  42                 struct sockaddr_storage storage;
  43         } sa_union;
  44         socklen_t l = sizeof(sa_union);
  45
  46         if (getsockname(fd, &sa_union.sa, &l) < 0)
  47                 return true;
  48
  49         if (sa_union.sa.sa_family != AF_INET &&
  50             sa_union.sa.sa_family != AF_INET6)
  51                 return true;
  52
  53         request_init(&req,
  54                      RQ_DAEMON, name,
  55                      RQ_FILE, fd,
  56                      NULL);
  57
  58         fromhost(&req);
  59
  60         if (!hosts_access(&req)) {
  61                 log_warning("Connection refused by tcpwrap.");
  62                 return false;
  63         }
  64
  65         log_debug("Connection accepted by tcpwrap.");
  66 #endif
  67         return true;
  68 }