--- gvpe/src/vpn.C 2003/10/15 06:06:41 1.17 +++ gvpe/src/vpn.C 2008/08/07 17:30:28 1.46 @@ -1,7 +1,10 @@ /* vpn.C -- handle the protocol, encryption, handshaking etc. + Copyright (C) 2003-2007 Marc Lehmann - This program is free software; you can redistribute it and/or modify + This file is part of GVPE. + + GVPE 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 2 of the License, or (at your option) any later version. @@ -12,17 +15,17 @@ 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, write to the Free Software - Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + along with gvpe; if not, write to the Free Software + Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "config.h" #include -#include -#include #include +#include +#include #include #include @@ -41,9 +44,24 @@ #include "util.h" #include "vpn.h" +vpn network; // THE vpn (bad design...) + ///////////////////////////////////////////////////////////////////////////// -const char *vpn::script_if_up () +static void inline +set_tos (int fd, int &tos_prev, int tos) +{ +#if defined(SOL_IP) && defined(IP_TOS) + if (tos_prev == tos) + return; + + tos_prev = tos; + setsockopt (fd, SOL_IP, IP_TOS, &tos, sizeof tos); +#endif +} + +void +vpn::script_init_env () { // the tunnel device mtu should be the physical mtu - overhead // the tricky part is rounding to the cipher key blocksize @@ -53,28 +71,51 @@ mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again char *env; - asprintf (&env, "CONFBASE=%s", confbase); - putenv (env); - asprintf (&env, "NODENAME=%s", THISNODE->nodename); - putenv (env); - asprintf (&env, "NODEID=%d", THISNODE->id); - putenv (env); - asprintf (&env, "IFNAME=%s", tap->interface ()); - putenv (env); - asprintf (&env, "MTU=%d", mtu); - putenv (env); - asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", - 0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, - THISNODE->id & 0xff); - putenv (env); + asprintf (&env, "CONFBASE=%s", confbase); putenv (env); + asprintf (&env, "IFNAME=%s", tap->interface ()); putenv (env); + asprintf (&env, "IFTYPE=%s", IFTYPE); putenv (env); + asprintf (&env, "IFSUBTYPE=%s", IFSUBTYPE); putenv (env); + asprintf (&env, "MTU=%d", mtu); putenv (env); + asprintf (&env, "NODES=%d", conns.size ()); putenv (env); + asprintf (&env, "NODEID=%d", THISNODE->id); putenv (env); + + conns [THISNODE->id - 1]->script_init_env (""); + + for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) + { + char ext[16]; + snprintf (ext, 16, "_%d", (*c)->conf->id); + (*c)->script_init_env (ext); + } +} - return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; +inline const char * +vpn::script_if_init () +{ + script_init_env (); + + return tap->if_up (); +} + +inline const char * +vpn::script_if_up () +{ + script_init_env (); + + char *filename; + asprintf (&filename, + "%s/%s", + confbase, + ::conf.script_if_up ? ::conf.script_if_up : "if-up"); + + return filename; } int vpn::setup () { - ipv4_fd = -1; + ipv4_tos = -1; + ipv4_fd = -1; if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) { @@ -84,6 +125,7 @@ return -1; fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); + fcntl (ipv4_fd, F_SETFD, FD_CLOEXEC); #if defined(SOL_IP) && defined(IP_MTU_DISCOVER) // this I really consider a linux bug. I am neither connected @@ -100,13 +142,14 @@ if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) { slog (L_ERR, _("can't bind ipv4 socket on %s: %s"), (const char *)si, strerror (errno)); - exit (1); + exit (EXIT_FAILURE); } - ipv4_ev_watcher.start (ipv4_fd, POLLIN); + ipv4_ev_watcher.start (ipv4_fd, EV_READ); } - udpv4_fd = -1; + udpv4_tos = -1; + udpv4_fd = -1; if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) { @@ -116,6 +159,7 @@ return -1; fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); + fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); // standard daemon practise... { @@ -138,13 +182,14 @@ if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) { slog (L_ERR, _("can't bind udpv4 on %s: %s"), (const char *)si, strerror (errno)); - exit (1); + exit (EXIT_FAILURE); } - udpv4_ev_watcher.start (udpv4_fd, POLLIN); + udpv4_ev_watcher.start (udpv4_fd, EV_READ); } - icmpv4_fd = -1; + icmpv4_tos = -1; + icmpv4_fd = -1; #if ENABLE_ICMP if (THISNODE->protocols & PROT_ICMPv4) @@ -155,6 +200,7 @@ return -1; fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); + fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); #ifdef ICMP_FILTER { @@ -173,7 +219,7 @@ // fragment for me sometimes. { int oval = IP_PMTUDISC_DONT; - setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); + setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); } #endif @@ -182,10 +228,10 @@ if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) { slog (L_ERR, _("can't bind icmpv4 on %s: %s"), (const char *)si, strerror (errno)); - exit (1); + exit (EXIT_FAILURE); } - icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); + icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); } #endif @@ -200,6 +246,7 @@ return -1; fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); + fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); // standard daemon practise... { @@ -212,69 +259,107 @@ if (bind (tcpv4_fd, si.sav4 (), si.salenv4 ())) { slog (L_ERR, _("can't bind tcpv4 on %s: %s"), (const char *)si, strerror (errno)); - exit (1); + exit (EXIT_FAILURE); } if (listen (tcpv4_fd, 5)) { slog (L_ERR, _("can't listen tcpv4 on %s: %s"), (const char *)si, strerror (errno)); - exit (1); + exit (EXIT_FAILURE); } - tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); + tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); } #endif - tap = new tap_device (); - if (!tap) //D this, of course, never catches + dnsv4_tos = -1; + dnsv4_fd = -1; + +#if ENABLE_DNS + if (THISNODE->protocols & PROT_DNSv4) { - slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); - exit (1); + dns_forwarder.set (::conf.dns_forw_host, ::conf.dns_forw_port, PROT_DNSv4); + + dnsv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); + + if (dnsv4_fd < 0) + return -1; + + fcntl (dnsv4_fd, F_SETFL, O_NONBLOCK); + fcntl (dnsv4_fd, F_SETFD, FD_CLOEXEC); + +# if defined(SOL_IP) && defined(IP_MTU_DISCOVER) + // this I really consider a linux bug. I am neither connected + // nor do I fragment myself. Linux still sets DF and doesn't + // fragment for me sometimes. + { + int oval = IP_PMTUDISC_DONT; + setsockopt (dnsv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); + } +# endif + + // standard daemon practise... + { + int oval = 1; + setsockopt (dnsv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); + } + + sockinfo si (THISNODE->dns_hostname, + THISNODE->dns_hostname ? THISNODE->dns_port : 0, + PROT_DNSv4); + + if (bind (dnsv4_fd, si.sav4 (), si.salenv4 ())) + { + slog (L_ERR, _("can't bind dnsv4 on %s: %s"), (const char *)si, strerror (errno)); + exit (EXIT_FAILURE); + } + + dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); } - - run_script (run_script_cb (this, &vpn::script_if_up), true); +#endif - tap_ev_watcher.start (tap->fd, POLLIN); + ///////////////////////////////////////////////////////////////////////////// reconnect_all (); - return 0; -} + ///////////////////////////////////////////////////////////////////////////// -// send a vpn packet out to other hosts -bool -vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) -{ - switch (si.prot) + tap = new tap_device (); + if (!tap) //D this, of course, never catches { - case PROT_IPv4: - return send_ipv4_packet (pkt, si, tos); - - case PROT_UDPv4: - return send_udpv4_packet (pkt, si, tos); + slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); + exit (EXIT_FAILURE); + } + + fcntl (tap->fd, F_SETFD, FD_CLOEXEC); -#if ENABLE_TCP - case PROT_TCPv4: - return send_tcpv4_packet (pkt, si, tos); -#endif + run_script_cb cb; + cb.set (this); -#if ENABLE_ICMP - case PROT_ICMPv4: - return send_icmpv4_packet (pkt, si, tos); -#endif + if (tap->if_up () && + !run_script (cb, true)) + { + slog (L_ERR, _("interface initialization command '%s' failed, exiting."), + tap->if_up ()); + exit (EXIT_FAILURE); + } - default: - slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); - return false; + cb.set (this); + if (!run_script (cb, true)) + { + slog (L_ERR, _("if-up command execution failed, exiting.")); + exit (EXIT_FAILURE); } + + tap_ev_watcher.start (tap->fd, EV_READ); + + return 0; } bool vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) { -#if defined(SOL_IP) && defined(IP_TOS) - setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); -#endif + set_tos (ipv4_fd, ipv4_tos, tos); sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); return true; @@ -307,10 +392,6 @@ bool vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) { -#if defined(SOL_IP) && defined(IP_TOS) - setsockopt (icmpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); -#endif - pkt->unshift_hdr (4); icmp_header *hdr = (icmp_header *)&((*pkt)[0]); @@ -319,6 +400,7 @@ hdr->checksum = 0; hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); + set_tos (icmpv4_fd, icmpv4_tos, tos); sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); return true; @@ -328,15 +410,32 @@ bool vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) { -#if defined(SOL_IP) && defined(IP_TOS) - setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); -#endif + set_tos (udpv4_fd, udpv4_tos, tos); sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); return true; } void +vpn::inject_data_packet (tap_packet *pkt, int dst) +{ + if (dst) + { + // unicast + if (dst != THISNODE->id) + conns[dst - 1]->inject_data_packet (pkt); + } + else + { + // broadcast, this is ugly, but due to the security policy + // we have to connect to all hosts... + for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) + if ((*c)->conf != THISNODE) + (*c)->inject_data_packet (pkt); + } +} + +void vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) { unsigned int src = pkt->src (); @@ -360,7 +459,7 @@ if (dst == 0) slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), c->conf->nodename, (const char *)rsi); - else if (dst != 0 && dst != THISNODE->id) + else if (dst != THISNODE->id) { if (THISNODE->routerprio) // the tos setting gets lost here. who cares. @@ -376,10 +475,40 @@ } } -void -vpn::ipv4_ev (io_watcher &w, short revents) +bool +vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) +{ + switch (si.prot) + { + case PROT_IPv4: + return send_ipv4_packet (pkt, si, tos); + + case PROT_UDPv4: + return send_udpv4_packet (pkt, si, tos); + +#if ENABLE_TCP + case PROT_TCPv4: + return send_tcpv4_packet (pkt, si, tos); +#endif +#if ENABLE_ICMP + case PROT_ICMPv4: + return send_icmpv4_packet (pkt, si, tos); +#endif +#if ENABLE_DNS + case PROT_DNSv4: + return send_dnsv4_packet (pkt, si, tos); +#endif + default: + slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); + } + + return false; +} + +inline void +vpn::ipv4_ev (ev::io &w, int revents) { - if (revents & (POLLIN | POLLERR)) + if (revents & EV_READ) { vpn_packet *pkt = new vpn_packet; struct sockaddr_in sa; @@ -394,8 +523,7 @@ { pkt->len = len; - // raw sockets deliver the ipv4, but don't expect it on sends - // this is slow, but... + // raw sockets deliver the ipv4 header, but don't expect it on sends pkt->skip_hdr (IP_OVERHEAD); recv_vpn_packet (pkt, si); @@ -408,26 +536,20 @@ delete pkt; } - else if (revents & POLLHUP) - { - // this cannot ;) happen on udp sockets - slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); - exit (1); - } else { slog (L_ERR, - _("FATAL: unknown revents %08x in socket, terminating\n"), - revents); - exit (1); + _("FATAL: unknown revents %08x in socket, terminating\n"), + revents); + exit (EXIT_FAILURE); } } #if ENABLE_ICMP -void -vpn::icmpv4_ev (io_watcher &w, short revents) +inline void +vpn::icmpv4_ev (ev::io &w, int revents) { - if (revents & (POLLIN | POLLERR)) + if (revents & EV_READ) { vpn_packet *pkt = new vpn_packet; struct sockaddr_in sa; @@ -462,26 +584,20 @@ delete pkt; } - else if (revents & POLLHUP) - { - // this cannot ;) happen on udp sockets - slog (L_ERR, _("FATAL: POLLHUP on icmpv4 fd, terminating.")); - exit (1); - } else { slog (L_ERR, _("FATAL: unknown revents %08x in socket, terminating\n"), revents); - exit (1); + exit (EXIT_FAILURE); } } #endif -void -vpn::udpv4_ev (io_watcher &w, short revents) +inline void +vpn::udpv4_ev (ev::io &w, int revents) { - if (revents & (POLLIN | POLLERR)) + if (revents & EV_READ) { vpn_packet *pkt = new vpn_packet; struct sockaddr_in sa; @@ -506,25 +622,19 @@ delete pkt; } - else if (revents & POLLHUP) - { - // this cannot ;) happen on udp sockets - slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); - exit (1); - } else { slog (L_ERR, _("FATAL: unknown revents %08x in socket, terminating\n"), revents); - exit (1); + exit (EXIT_FAILURE); } } -void -vpn::tap_ev (io_watcher &w, short revents) +inline void +vpn::tap_ev (ev::io &w, int revents) { - if (revents & POLLIN) + if (revents & EV_READ) { /* process data */ tap_packet *pkt; @@ -541,50 +651,30 @@ if (src != THISNODE->id) { - slog (L_ERR, _("FATAL: tap packet not originating on current node received, exiting.")); - exit (1); + slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); + exit (EXIT_FAILURE); } if (dst == THISNODE->id) { slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); - exit (1); + exit (EXIT_FAILURE); } if (dst > conns.size ()) slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); else - { - if (dst) - { - // unicast - if (dst != THISNODE->id) - conns[dst - 1]->inject_data_packet (pkt); - } - else - { - // broadcast, this is ugly, but due to the security policy - // we have to connect to all hosts... - for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) - if ((*c)->conf != THISNODE) - (*c)->inject_data_packet (pkt); - } - } + inject_data_packet (pkt, dst); } delete pkt; } - else if (revents & (POLLHUP | POLLERR)) - { - slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); - exit (1); - } else abort (); } -void -vpn::event_cb (time_watcher &w) +inline void +vpn::event_cb (ev::timer &w, int) { if (events) { @@ -593,12 +683,9 @@ slog (L_INFO, _("preparing shutdown...")); shutdown_all (); - - remove_pid (pidfilename); - + remove_pid (conf.pidfilename); slog (L_INFO, _("terminating")); - - exit (0); + exit (EXIT_SUCCESS); } if (events & EVENT_RECONNECT) @@ -610,8 +697,6 @@ events = 0; } - - w.at = TSTAMP_CANCEL; } void @@ -634,11 +719,8 @@ for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i) { - connection *conn = new connection (this); - - conn->conf = *i; + connection *conn = new connection (this, *i); conns.push_back (conn); - conn->establish_connection (); } } @@ -693,7 +775,7 @@ void vpn::dump_status () { - slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); + slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)ev_now ()); for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) (*c)->dump_status (); @@ -702,17 +784,20 @@ } vpn::vpn (void) -: event (this, &vpn::event_cb) -, udpv4_ev_watcher (this, &vpn::udpv4_ev) -, ipv4_ev_watcher (this, &vpn::ipv4_ev) +{ + event .set (this); + udpv4_ev_watcher .set (this); + ipv4_ev_watcher .set (this); #if ENABLE_TCP -, tcpv4_ev_watcher (this, &vpn::tcpv4_ev) + tcpv4_ev_watcher .set (this); #endif #if ENABLE_ICMP -, icmpv4_ev_watcher(this, &vpn::icmpv4_ev) + icmpv4_ev_watcher.set (this); #endif -, tap_ev_watcher (this, &vpn::tap_ev) -{ +#if ENABLE_DNS + dnsv4_ev_watcher .set (this); +#endif + tap_ev_watcher .set (this); } vpn::~vpn ()