From 708314df2f61675d0f54e541c9fff62ac1f433b5 Mon Sep 17 00:00:00 2001 From: Guus Sliepen Date: Fri, 17 Feb 2012 16:13:38 +0100 Subject: [PATCH] Set FD_CLOEXEC flag on all sockets. 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. --- THANKS | 1 + src/bsd/device.c | 6 +++++- src/linux/device.c | 6 +++++- src/net_socket.c | 14 +++++++++++++- src/raw_socket_device.c | 6 +++++- src/solaris/device.c | 14 +++++++++++++- src/uml_device.c | 18 +++++++++++++++++- src/vde_device.c | 6 +++++- 8 files changed, 64 insertions(+), 7 deletions(-) diff --git a/THANKS b/THANKS index 4a6eae20..f26f268c 100644 --- a/THANKS +++ b/THANKS @@ -31,6 +31,7 @@ We would like to thank the following people for their contributions to tinc: * Menno Smits * Michael Tokarev * Miles Nordin +* Nick Hibma * Nick Patavalis * Paul Littlefield * Robert van der Meulen diff --git a/src/bsd/device.c b/src/bsd/device.c index f1d3f9f4..45c2d5f6 100644 --- a/src/bsd/device.c +++ b/src/bsd/device.c @@ -1,7 +1,7 @@ /* device.c -- Interaction BSD tun/tap device Copyright (C) 2001-2005 Ivo Timmermans, - 2001-2011 Guus Sliepen + 2001-2012 Guus Sliepen 2009 Grzegorz Dymarek This program is free software; you can redistribute it and/or modify @@ -106,6 +106,10 @@ static bool setup_device(void) { return false; } +#ifdef FD_CLOEXEC + fcntl(device_fd, F_SETFD, FD_CLOEXEC); +#endif + switch(device_type) { default: device_type = DEVICE_TYPE_TUN; diff --git a/src/linux/device.c b/src/linux/device.c index c06e7b93..f50ff112 100644 --- a/src/linux/device.c +++ b/src/linux/device.c @@ -1,7 +1,7 @@ /* device.c -- Interaction with Linux ethertap and tun/tap device Copyright (C) 2001-2005 Ivo Timmermans, - 2001-2011 Guus Sliepen + 2001-2012 Guus Sliepen 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 @@ -72,6 +72,10 @@ static bool setup_device(void) { return false; } +#ifdef FD_CLOEXEC + fcntl(device_fd, F_SETFD, FD_CLOEXEC); +#endif + #ifdef HAVE_LINUX_IF_TUN_H /* Ok now check if this is an old ethertap or a new tun/tap thingie */ diff --git a/src/net_socket.c b/src/net_socket.c index a45bc204..d8bb0078 100644 --- a/src/net_socket.c +++ b/src/net_socket.c @@ -1,7 +1,7 @@ /* net_socket.c -- Handle various kinds of sockets. Copyright (C) 1998-2005 Ivo Timmermans, - 2000-2010 Guus Sliepen + 2000-2012 Guus Sliepen 2006 Scott Lamb 2009 Florian Forster @@ -180,6 +180,10 @@ int setup_listen_socket(const sockaddr_t *sa) { return -1; } +#ifdef FD_CLOEXEC + fcntl(nfd, F_SETFD, FD_CLOEXEC); +#endif + /* Optimize TCP settings */ option = 1; @@ -238,6 +242,10 @@ int setup_vpn_in_socket(const sockaddr_t *sa) { return -1; } +#ifdef FD_CLOEXEC + fcntl(nfd, F_SETFD, FD_CLOEXEC); +#endif + #ifdef O_NONBLOCK { int flags = fcntl(nfd, F_GETFL); @@ -410,6 +418,10 @@ begin: c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP); +#ifdef FD_CLOEXEC + fcntl(c->socket, F_SETFD, FD_CLOEXEC); +#endif + if(c->socket == -1) { ifdebug(CONNECTIONS) logger(LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno)); goto begin; diff --git a/src/raw_socket_device.c b/src/raw_socket_device.c index 90ccedfc..e2692ecc 100644 --- a/src/raw_socket_device.c +++ b/src/raw_socket_device.c @@ -1,7 +1,7 @@ /* device.c -- raw socket Copyright (C) 2002-2005 Ivo Timmermans, - 2002-2011 Guus Sliepen + 2002-2012 Guus Sliepen 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)) { diff --git a/src/solaris/device.c b/src/solaris/device.c index 579cece0..969b514a 100644 --- a/src/solaris/device.c +++ b/src/solaris/device.c @@ -1,7 +1,7 @@ /* device.c -- Interaction with Solaris tun device Copyright (C) 2001-2005 Ivo Timmermans, - 2001-2011 Guus Sliepen + 2001-2012 Guus Sliepen 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 @@ -55,6 +55,10 @@ static bool setup_device(void) { return false; } +#ifdef FD_CLOEXEC + fcntl(device_fd, F_SETFD, FD_CLOEXEC); +#endif + ppa = 0; ptr = device; @@ -67,6 +71,10 @@ static bool setup_device(void) { return false; } +#ifdef FD_CLOEXEC + fcntl(ip_fd, F_SETFD, FD_CLOEXEC); +#endif + /* Assign a new PPA and get its unit number. */ if((ppa = ioctl(device_fd, TUNNEWPPA, ppa)) < 0) { logger(LOG_ERR, "Can't assign new interface: %s", strerror(errno)); @@ -79,6 +87,10 @@ static bool setup_device(void) { return false; } +#ifdef FD_CLOEXEC + fcntl(if_fd, F_SETFD, FD_CLOEXEC); +#endif + if(ioctl(if_fd, I_PUSH, "ip") < 0) { logger(LOG_ERR, "Can't push IP module: %s", strerror(errno)); return false; diff --git a/src/uml_device.c b/src/uml_device.c index 26bcb01c..a0b87f93 100644 --- a/src/uml_device.c +++ b/src/uml_device.c @@ -1,7 +1,7 @@ /* device.c -- UML network socket Copyright (C) 2002-2005 Ivo Timmermans, - 2002-2011 Guus Sliepen + 2002-2012 Guus Sliepen 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 @@ -77,6 +77,10 @@ static bool setup_device(void) { return false; } +#ifdef FD_CLOEXEC + fcntl(write_fd, F_SETFD, FD_CLOEXEC); +#endif + setsockopt(write_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one); if(fcntl(write_fd, F_SETFL, O_NONBLOCK) < 0) { @@ -91,6 +95,10 @@ static bool setup_device(void) { return false; } +#ifdef FD_CLOEXEC + fcntl(data_fd, F_SETFD, FD_CLOEXEC); +#endif + setsockopt(data_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one); if(fcntl(data_fd, F_SETFL, O_NONBLOCK) < 0) { @@ -118,6 +126,10 @@ static bool setup_device(void) { return false; } +#ifdef FD_CLOEXEC + fcntl(device_fd, F_SETFD, FD_CLOEXEC); +#endif + setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one); if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) { @@ -181,6 +193,10 @@ static bool read_packet(vpn_packet_t *packet) { return false; } +#ifdef FD_CLOEXEC + fcntl(request_fd, F_SETFD, FD_CLOEXEC); +#endif + if(fcntl(listen_fd, F_SETFL, O_NONBLOCK) < 0) { logger(LOG_ERR, "System call `%s' failed: %s", "fcntl", strerror(errno)); running = false; diff --git a/src/vde_device.c b/src/vde_device.c index 8f601e79..258945ed 100644 --- a/src/vde_device.c +++ b/src/vde_device.c @@ -1,6 +1,6 @@ /* device.c -- VDE plug - Copyright (C) 2011 Guus Sliepen + Copyright (C) 2012 Guus Sliepen 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 @@ -74,6 +74,10 @@ static bool setup_device(void) { device_fd = plug.vde_datafd(conn); +#ifdef FD_CLOEXEC + fcntl(device_fd, F_SETFD, FD_CLOEXEC); +#endif + logger(LOG_INFO, "%s is a %s", device, device_info); if(routing_mode == RMODE_ROUTER) -- 2.20.1