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Set FD_CLOEXEC flag on all sockets.

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Scripts called by tinc would inherit its open filedescriptors. This could
be a problem if other long-running daemons are started from those scripts,
if those daemons would not close all filedescriptors before going into the
background.

Problem found and solution suggested by Nick Hibma.
This commit is contained in:
Guus Sliepen 2012-02-17 16:13:38 +01:00
parent 178e52f76e
commit 708314df2f
8 changed files with 64 additions and 7 deletions
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6
src/raw_socket_device.c
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@ -1,7 +1,7 @@
/*
device.c -- raw socket
Copyright (C) 2002-2005 Ivo Timmermans,
2002-2011 Guus Sliepen <guus@tinc-vpn.org>
2002-2012 Guus Sliepen <guus@tinc-vpn.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
@ -53,6 +53,10 @@ static bool setup_device(void) {
return false;
}
#ifdef FD_CLOEXEC
fcntl(device_fd, F_SETFD, FD_CLOEXEC);
#endif
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
if(ioctl(device_fd, SIOCGIFINDEX, &ifr)) {