--- gvpe/src/vpn.C 2003/04/04 05:26:45 1.4 +++ gvpe/src/vpn.C 2008/08/10 01:34:36 1.49 @@ -1,38 +1,52 @@ /* vpn.C -- handle the protocol, encryption, handshaking etc. + Copyright (C) 2003-2008 Marc Lehmann - 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 2 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, write to the Free Software - Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + 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 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 . + + Additional permission under GNU GPL version 3 section 7 + + If you modify this Program, or any covered work, by linking or + combining it with the OpenSSL project's OpenSSL library (or a modified + version of that library), containing parts covered by the terms of the + OpenSSL or SSLeay licenses, the licensors of this Program grant you + additional permission to convey the resulting work. Corresponding + Source for a non-source form of such a combination shall include the + source code for the parts of OpenSSL used as well as that of the + covered work. */ #include "config.h" #include -#include -#include #include +#include +#include #include #include -#include #include -#include -#include #include #include #include +#include +#include + +#include "netcompat.h" #include "pidfile.h" @@ -40,16 +54,24 @@ #include "util.h" #include "vpn.h" -#if ENABLE_TCP -# include -# include -# include -# include -#endif +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 @@ -59,51 +81,103 @@ 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 (""); - return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; + 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); + } +} + +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 () { - udpv4_fd = -1; + ipv4_tos = -1; + ipv4_fd = -1; - if (THISNODE->protocols & PROT_UDPv4) + if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) + { + ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); + + if (ipv4_fd < 0) + 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 + // nor do I fragment myself. Linux still sets DF and doesn't + // fragment for me sometimes. + { + int oval = IP_PMTUDISC_DONT; + setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); + } +#endif + + sockinfo si (THISNODE, PROT_IPv4); + + if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) + { + slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); + exit (EXIT_FAILURE); + } + + ipv4_ev_watcher.start (ipv4_fd, EV_READ); + } + + udpv4_tos = -1; + udpv4_fd = -1; + + if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) { udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); if (udpv4_fd < 0) return -1; + fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); + fcntl (udpv4_fd, F_SETFD, FD_CLOEXEC); + // standard daemon practise... { int oval = 1; setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); } - sockinfo si (THISNODE, PROT_UDPv4); - - 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); - } - -#ifdef IP_MTU_DISCOVER +#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. @@ -113,46 +187,77 @@ } #endif - udpv4_ev_watcher.start (udpv4_fd, POLLIN); + sockinfo si (THISNODE, PROT_UDPv4); + + if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) + { + slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); + exit (EXIT_FAILURE); + } + + udpv4_ev_watcher.start (udpv4_fd, EV_READ); } - ipv4_fd = -1; - if (THISNODE->protocols & PROT_IPv4) + icmpv4_tos = -1; + icmpv4_fd = -1; + +#if ENABLE_ICMP + if (THISNODE->protocols & PROT_ICMPv4) { - ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); + icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); - if (ipv4_fd < 0) + if (icmpv4_fd < 0) return -1; - sockinfo si (THISNODE, PROT_IPv4); + fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); + fcntl (icmpv4_fd, F_SETFD, FD_CLOEXEC); - 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); - } +#ifdef ICMP_FILTER + { + icmp_filter oval; + oval.data = 0xffffffff; + if (::conf.icmp_type < 32) + oval.data &= ~(1 << ::conf.icmp_type); -#ifdef IP_MTU_DISCOVER + setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); + } +#endif + +#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 (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); + setsockopt (icmpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); } #endif - ipv4_ev_watcher.start (ipv4_fd, POLLIN); + sockinfo si (THISNODE, PROT_ICMPv4); + + if (bind (icmpv4_fd, si.sav4 (), si.salenv4 ())) + { + slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); + exit (EXIT_FAILURE); + } + + icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); } +#endif + + tcpv4_fd = -1; #if ENABLE_TCP - if (THISNODE->protocols & PROT_TCPv4) + if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) { tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); if (tcpv4_fd < 0) return -1; + fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); + fcntl (tcpv4_fd, F_SETFD, FD_CLOEXEC); + // standard daemon practise... { int oval = 1; @@ -163,48 +268,181 @@ 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); + slog (L_ERR, _("can't bind tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); + 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); + slog (L_ERR, _("can't listen tcpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); + exit (EXIT_FAILURE); + } + + tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); + } +#endif + + dnsv4_tos = -1; + dnsv4_fd = -1; + +#if ENABLE_DNS + if (THISNODE->protocols & PROT_DNSv4) + { + 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, exiting."), (const char *)si, strerror (errno)); + exit (EXIT_FAILURE); } - tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); + dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); } #endif + ///////////////////////////////////////////////////////////////////////////// + + reconnect_all (); + + ///////////////////////////////////////////////////////////////////////////// + tap = new tap_device (); if (!tap) //D this, of course, never catches { - slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); - exit (1); + slog (L_ERR, _("cannot create network interface '%s', exiting."), conf.ifname); + exit (EXIT_FAILURE); } - run_script (run_script_cb (this, &vpn::script_if_up), true); + fcntl (tap->fd, F_SETFD, FD_CLOEXEC); - tap_ev_watcher.start (tap->fd, POLLIN); + run_script_cb cb; + cb.set (this); - reconnect_all (); + if (tap->if_up () && + !run_script (cb, true)) + { + slog (L_ERR, _("interface initialization command '%s' failed, exiting."), + tap->if_up ()); + exit (EXIT_FAILURE); + } + + 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; } -void +bool vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) { - setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); + set_tos (ipv4_fd, ipv4_tos, tos); sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); + + return true; } -void +static u16 +ipv4_checksum (u16 *data, unsigned int len) +{ + // use 32 bit accumulator and fold back carry bits at the end + u32 sum = 0; + + while (len > 1) + { + sum += *data++; + len -= 2; + } + + // odd byte left? + if (len) + sum += *(u8 *)data; + + // add back carry bits + sum = (sum >> 16) + (sum & 0xffff); // lo += hi + sum += (sum >> 16); // carry + + return ~sum; +} + +#if ENABLE_ICMP +bool +vpn::send_icmpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) +{ + pkt->unshift_hdr (4); + + icmp_header *hdr = (icmp_header *)&((*pkt)[0]); + hdr->type = ::conf.icmp_type; + hdr->code = 255; + 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; +} +#endif + +bool vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) { - setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); + 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 @@ -213,359 +451,240 @@ unsigned int src = pkt->src (); unsigned int dst = pkt->dst (); - slog (L_NOISE, _("<typ (), pkt->src (), pkt->dst (), pkt->len); if (src == 0 || src > conns.size () || dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX) - slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), + slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), + (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); + else if (dst > conns.size ()) + slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)."), (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); else { connection *c = conns[src - 1]; - if (dst == 0 && !THISNODE->routerprio) - slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), + 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) - // FORWARDING NEEDED ;) - slog (L_WARN, - _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), - dst, conns[dst - 1]->conf->nodename, - (const char *)rsi, - THISNODE->id, THISNODE->nodename); + else if (dst != THISNODE->id) + { + if (THISNODE->routerprio) + // the tos setting gets lost here. who cares. + conns[dst - 1]->inject_vpn_packet (pkt); + else + slog (L_WARN, + _("%s(%s): request to forward packet to %s, but we are no router (config mismatch?)."), + c->conf->nodename, (const char *)rsi, + conns[dst - 1]->conf->nodename); + } else c->recv_vpn_packet (pkt, rsi); } } -void -vpn::udpv4_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; socklen_t sa_len = sizeof (sa); int len; - len = recvfrom (w.p->fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); + len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); - sockinfo si(sa); + sockinfo si(sa, PROT_IPv4); if (len > 0) { pkt->len = len; + // raw sockets deliver the ipv4 header, but don't expect it on sends + pkt->skip_hdr (IP_OVERHEAD); + recv_vpn_packet (pkt, si); } else { // probably ECONNRESET or somesuch - slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); + slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); } 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); + _("FATAL: unknown revents %08x in socket, exiting.\n"), + revents); + exit (EXIT_FAILURE); } } -void -vpn::ipv4_ev (io_watcher &w, short revents) +#if ENABLE_ICMP +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; socklen_t sa_len = sizeof (sa); int len; - len = recvfrom (w.p->fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); + len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); - sockinfo si(sa, PROT_IPv4); + sockinfo si(sa, PROT_ICMPv4); if (len > 0) { pkt->len = len; - // raw sockets deliver the ipv4, but don't expect it on sends - // this is slow, but... - pkt->skip_hdr (IP_OVERHEAD); + icmp_header *hdr = (icmp_header *)&((*pkt)[IP_OVERHEAD]); - recv_vpn_packet (pkt, si); + if (hdr->type == ::conf.icmp_type + && hdr->code == 255) + { + // raw sockets deliver the ipv4, but don't expect it on sends + // this is slow, but... + pkt->skip_hdr (ICMP_OVERHEAD); + + recv_vpn_packet (pkt, si); + } } else { // probably ECONNRESET or somesuch - slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); + slog (L_DEBUG, _("%s: %s."), (const char *)si, strerror (errno)); } 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"), + _("FATAL: unknown revents %08x in socket, exiting.\n"), revents); - exit (1); + exit (EXIT_FAILURE); } } +#endif -#if ENABLE_TCP - -struct tcp_connection; - -struct lt_sockinfo -{ - bool operator()(const sockinfo *a, const sockinfo *b) const - { - return *a < *b; - } -}; - -struct tcp_si_map : public map { - void cleaner_cb (time_watcher &w); time_watcher cleaner; - - tcp_si_map () - : cleaner(this, &tcp_si_map::cleaner_cb) - { - cleaner.start (0); - } -} tcp_si; - -struct tcp_connection : io_watcher { - tstamp last_activity; - const sockinfo si; - vpn &v; - bool ok; - - vpn_packet *r_pkt; - u32 r_len, r_ofs; - - void tcpv4_ev (io_watcher &w, short revents); - - operator tcp_si_map::value_type() - { - return tcp_si_map::value_type (&si, this); - } - - tcp_connection (int fd, const sockinfo &si_, vpn &v_) - : v(v_), si(si_), io_watcher(this, &tcp_connection::tcpv4_ev) - { - last_activity = NOW; - ok = false; - r_pkt = 0; - start (fd, POLLOUT); - } - - ~tcp_connection () { if (p) close (p->fd); } -}; - -void tcp_si_map::cleaner_cb (time_watcher &w) -{ - w.at = NOW + 600; - tstamp to = NOW - ::conf.keepalive - 30; - - for (iterator i = begin (); i != end(); ) - if (i->second->last_activity >= to) - ++i; - else - { - erase (i); - i = begin (); - } -} - -void -vpn::send_tcpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) +inline void +vpn::udpv4_ev (ev::io &w, int revents) { - tcp_si_map::iterator info = tcp_si.find (&si); - - if (info == tcp_si.end ()) + if (revents & EV_READ) { - // woaw, the first lost packet ;) - int fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); - - if (fd >= 0) - { - fcntl (fd, F_SETFL, O_NONBLOCK); - - if (connect (fd, si.sav4 (), si.salenv4 ()) >= 0 - || errno == EINPROGRESS) - { - tcp_connection *i = new tcp_connection (fd, si, *this); + vpn_packet *pkt = new vpn_packet; + struct sockaddr_in sa; + socklen_t sa_len = sizeof (sa); + int len; - tcp_si.insert (*i); - } - else - close (fd); - } - } - else - { - tcp_connection *i = info->second; + len = recvfrom (w.fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); - i->last_activity = NOW; + sockinfo si(sa, PROT_UDPv4); - if (i->ok) + if (len > 0) { - setsockopt (i->p->fd, SOL_IP, IP_TOS, &tos, sizeof tos); + pkt->len = len; - // we use none of the advantages of tcp - write (i->p->fd, (void *)pkt, pkt->len + sizeof (u32)) != pkt->len + sizeof (u32); + recv_vpn_packet (pkt, si); } - } - -#if 0 - setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); - sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); -#endif -} - -void -tcp_connection::tcpv4_ev (io_watcher &w, short revents) -{ - last_activity = NOW; - - if (!ok) // just established? - { - ok = true; - set (POLLIN); - } - - if (revents & (POLLIN | POLLERR)) - { - u32 len; - - if (sizeof (len) == read (p->fd, &len, sizeof (len))) + else { - vpn_packet *pkt = new vpn_packet; - - if (len == read (p->fd, &((*pkt)[0]), len)) - { - pkt->len = len; - - v.recv_vpn_packet (pkt, si); - return; - } - - delete pkt; + // probably ECONNRESET or somesuch + slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, strerror (errno)); } - tcp_si.erase (&si); - - set (0);//D + delete pkt; } -} - -void -vpn::tcpv4_ev (io_watcher &w, short revents) -{ - if (revents & (POLLIN | POLLERR)) + else { - struct sockaddr_in sa; - socklen_t sa_len = sizeof (sa); - int len; - - int fd = accept (w.p->fd, (sockaddr *)&sa, &sa_len); - - if (fd >= 0) - { - fcntl (fd, F_SETFL, O_NONBLOCK); - - sockinfo si(sa, PROT_TCPv4); - tcp_connection *i = new tcp_connection (fd, si, *this); - - slog (L_DEBUG, _("accepted tcp connection from %s\n"), (const char *)si);//D - - tcp_si.insert (*i); - } + slog (L_ERR, + _("FATAL: unknown revents %08x in socket, exiting.\n"), + revents); + exit (EXIT_FAILURE); } } -#endif - -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; pkt = tap->recv (); - int dst = mac2id (pkt->dst); - int src = mac2id (pkt->src); + if (!pkt) + return; - if (src != THISNODE->id) + if (pkt->len > 14) { - slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); - exit (1); - } + int dst = mac2id (pkt->dst); + int src = mac2id (pkt->src); - if (dst == THISNODE->id) - { - slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); - exit (1); - } - - if (dst > conns.size ()) - slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); - else - { - if (dst) + if (src != THISNODE->id) { - // unicast - if (dst != THISNODE->id) - conns[dst - 1]->inject_data_packet (pkt); + slog (L_ERR, _("FATAL: tap packet not originating on current node received (if-up script not working properly?), exiting.")); + exit (EXIT_FAILURE); } - else - { - // broadcast, first check router, then self, then english - connection *router = find_router (); - if (router) - router->inject_data_packet (pkt, true); - else - for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) - if ((*c)->conf != THISNODE) - (*c)->inject_data_packet (pkt); + if (dst == THISNODE->id) + { + slog (L_ERR, _("FATAL: tap packet destined for current node received, exiting.")); + exit (EXIT_FAILURE); } + + if (dst > conns.size ()) + slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); + else + 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) { @@ -574,25 +693,20 @@ slog (L_INFO, _("preparing shutdown...")); shutdown_all (); - - remove_pid (pidfilename); - - slog (L_INFO, _("terminating")); - - exit (0); + remove_pid (conf.pidfilename); + slog (L_INFO, _("exiting.")); + exit (EXIT_SUCCESS); } if (events & EVENT_RECONNECT) { - slog (L_INFO, _("forced reconnect")); + slog (L_INFO, _("forced reconnect.")); reconnect_all (); } events = 0; } - - w.at = TSTAMP_CANCEL; } void @@ -615,48 +729,110 @@ 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 (); } } -connection *vpn::find_router () +bool vpn::can_direct (conf_node *src, conf_node *dst) const +{ + return src != dst + && src->may_direct (dst) + && dst->may_direct (src) + && (((src->protocols & dst->protocols) && src->connectmode == conf_node::C_ALWAYS) + || (src->protocols & dst->connectable_protocols ())); +} + +// only works for indirect and routed connections: find a router +// from THISNODE to dst +connection *vpn::find_router_for (const connection *dst) { - u32 prio = 0; connection *router = 0; + // first try to find a router with a direct connection + { + u32 prio = 1; + + for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) + { + connection *c = *i; + + if (c->conf->routerprio > prio + && c->conf != THISNODE + && c != dst + && can_direct (c->conf, dst->conf)) + { + if (c->ictx && c->octx) + { + prio = c->conf->routerprio; + router = c; + } + else + c->establish_connection (); + } + } + } + + if (router) + return router; + + // second try find the router with the highest priority higher than ours + { + u32 prio = 1; + + for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) + { + connection *c = *i; + + if (c->conf->routerprio > prio + && c->conf->routerprio > THISNODE->routerprio + && c != dst + && c->conf != THISNODE) + { + if (c->ictx && c->octx) + { + prio = c->conf->routerprio; + router = c; + } + else + c->establish_connection (); + } + } + } + return router; +} + +void vpn::connection_established (connection *c) +{ for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) { - connection *c = *i; + connection *o = *i; - if (c->conf->routerprio > prio - && c->connectmode == conf_node::C_ALWAYS - && c->conf != THISNODE - && c->ictx && c->octx) + if (!o->is_direct + && o->si.valid () + && c->si != o->si + && c == find_router_for (o)) { - prio = c->conf->routerprio; - router = c; + slog (L_DEBUG, _("%s: can now route packets via %s, re-keying connection."), + o->conf->nodename, c->conf->nodename); + o->rekey (); } } - - return router; } -void vpn::connect_request (int id) +void vpn::send_connect_request (int id) { - connection *c = find_router (); + connection *c = find_router_for (conns[id]); if (c) - c->connect_request (id); - //else // does not work, because all others must connect to the same router - // // no router found, aggressively connect to all routers - // for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) - // if ((*i)->conf->routerprio) - // (*i)->establish_connection (); + { + slog (L_TRACE, _("%s: no way to connect, sending mediated connection request via %s."), + conns[id]->conf->nodename, c->conf->nodename); + c->send_connect_request (id); + } + else + slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect."), conns[id]->conf->nodename); } void @@ -667,14 +843,12 @@ connectmode, conf->connectmode, (const char *)si, (int)prot_minor); slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); - slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), - (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); } 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 (); @@ -683,14 +857,20 @@ } vpn::vpn (void) -: event(this, &vpn::event_cb) -, udpv4_ev_watcher(this, &vpn::udpv4_ev) -, ipv4_ev_watcher (this, &vpn::ipv4_ev) -, tap_ev_watcher (this, &vpn::tap_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.set (this); +#endif +#if ENABLE_DNS + dnsv4_ev_watcher .set (this); +#endif + tap_ev_watcher .set (this); } vpn::~vpn ()