--- gvpe/src/vpn.C 2003/10/16 02:28:36 1.18 +++ gvpe/src/vpn.C 2022/10/06 03:25:54 1.71 @@ -1,32 +1,46 @@ /* vpn.C -- handle the protocol, encryption, handshaking etc. + Copyright (C) 2003-2008,2010,2011,2013 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 @@ -41,50 +55,133 @@ #include "util.h" #include "vpn.h" +using namespace std; + +vpn network; // THE vpn (bad design...) + +///////////////////////////////////////////////////////////////////////////// + +// hopefully temporary workaround for rare buffer full conditions +// if it happens, usually instantly retrying or retrying ~5ms later +// is good enough with current network technologies/kernels + +static ssize_t +xsendto (int fd, const void *buf, size_t len, int flags, + const struct sockaddr *sa, socklen_t salen) +{ + ssize_t res; + + for (int retry = 0; retry <= 13; ++retry) // ~100ms + { + res = sendto (fd, buf, len, flags, sa, salen); + + if (res >= 0 || errno != ENOBUFS) + break; + + struct timespec ts = { 0, 1000 * retry }; + nanosleep (&ts, 0); + } + + return res; +} + ///////////////////////////////////////////////////////////////////////////// -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 int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion - mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round + mtu -= mtu % BLOCK_SIZE (CIPHER); // round 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); - return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; + 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); + } +} + +inline const char * +vpn::script_if_init () +{ + script_init_env (); + + return tap->if_up (); +} + +inline const char * +vpn::script_if_up () +{ + script_init_env (); + + return conf.config_filename (::conf.script_if_up, "if-up"); +} + +int +vpn::setup_socket (u8 prot, int family, int type, int proto) +{ + int fd = socket (family, type, proto); + + if (fd < 0) + { + slog (L_ERR, _("unable to create %s socket: %s."), strprotocol (prot), strerror (errno)); + return fd; + } + + fcntl (fd, F_SETFL, O_NONBLOCK); + fcntl (fd, F_SETFD, FD_CLOEXEC); + +#ifdef SO_MARK + if (::conf.nfmark) + if (setsockopt (fd, SOL_SOCKET, SO_MARK, &::conf.nfmark, sizeof ::conf.nfmark)) + slog (L_WARN, _("unable to set nfmark on %s socket: %s"), strprotocol (prot), strerror (errno)); +#endif + + return fd; } int vpn::setup () { - ipv4_fd = -1; + int success = 0; + + ipv4_tos = -1; + ipv4_fd = -1; if (THISNODE->protocols & PROT_IPv4 && ::conf.ip_proto) { - ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); + ipv4_fd = setup_socket (PROT_IPv4, PF_INET, SOCK_RAW, ::conf.ip_proto); if (ipv4_fd < 0) return -1; - fcntl (ipv4_fd, F_SETFL, O_NONBLOCK); - #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 @@ -99,24 +196,26 @@ 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); + slog (L_ERR, _("can't bind ipv4 socket on %s: %s, exiting."), (const char *)si, strerror (errno)); + return -1; } - ipv4_ev_watcher.start (ipv4_fd, POLLIN); + ipv4_ev_watcher.start (ipv4_fd, EV_READ); + ++success; } + else + THISNODE->protocols &= ~PROT_IPv4; - udpv4_fd = -1; + udpv4_tos = -1; + udpv4_fd = -1; if (THISNODE->protocols & PROT_UDPv4 && THISNODE->udp_port) { - udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); + udpv4_fd = setup_socket (PROT_UDPv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); if (udpv4_fd < 0) return -1; - fcntl (udpv4_fd, F_SETFL, O_NONBLOCK); - // standard daemon practise... { int oval = 1; @@ -137,31 +236,39 @@ 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); + slog (L_ERR, _("can't bind udpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); + return -1; } - udpv4_ev_watcher.start (udpv4_fd, POLLIN); + udpv4_ev_watcher.start (udpv4_fd, EV_READ); + ++success; } + else + THISNODE->protocols &= ~PROT_UDPv4; - icmpv4_fd = -1; + icmpv4_tos = -1; + icmpv4_fd = -1; #if ENABLE_ICMP if (THISNODE->protocols & PROT_ICMPv4) { - icmpv4_fd = socket (PF_INET, SOCK_RAW, IPPROTO_ICMP); + icmpv4_fd = setup_socket (PROT_ICMPv4, PF_INET, SOCK_RAW, IPPROTO_ICMP); if (icmpv4_fd < 0) return -1; - fcntl (icmpv4_fd, F_SETFL, O_NONBLOCK); +// no clue where trhis is actually defined +#if !defined(ICMP_FILTER) && defined(__linux) + #define ICMP_FILTER 1 +#endif #ifdef ICMP_FILTER { - icmp_filter oval; - oval.data = 0xffffffff; + uint32_t oval; + oval = 0; if (::conf.icmp_type < 32) - oval.data &= ~(1 << ::conf.icmp_type); + oval |= 1 << ::conf.icmp_type; + oval = ~oval; setsockopt (icmpv4_fd, SOL_RAW, ICMP_FILTER, &oval, sizeof oval); } @@ -173,7 +280,7 @@ // 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 @@ -181,11 +288,12 @@ 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); + slog (L_ERR, _("can't bind icmpv4 on %s: %s, exiting."), (const char *)si, strerror (errno)); + return -1; } - icmpv4_ev_watcher.start (icmpv4_fd, POLLIN); + icmpv4_ev_watcher.start (icmpv4_fd, EV_READ); + ++success; } #endif @@ -194,13 +302,11 @@ #if ENABLE_TCP if (THISNODE->protocols & PROT_TCPv4 && THISNODE->tcp_port) { - tcpv4_fd = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); + tcpv4_fd = setup_socket (PROT_TCPv4, PF_INET, SOCK_STREAM, IPPROTO_TCP); if (tcpv4_fd < 0) return -1; - fcntl (tcpv4_fd, F_SETFL, O_NONBLOCK); - // standard daemon practise... { int oval = 1; @@ -211,71 +317,184 @@ 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)); + return -1; } 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)); + return -1; + } + + tcpv4_ev_watcher.start (tcpv4_fd, EV_READ); + ++success; + } + else + THISNODE->protocols &= ~PROT_TCPv4; +#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 = setup_socket (PROT_DNSv4, PF_INET, SOCK_DGRAM, IPPROTO_UDP); + + if (dnsv4_fd < 0) + return -1; + +# 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)); + return -1; } - tcpv4_ev_watcher.start (tcpv4_fd, POLLIN); + dnsv4_ev_watcher.start (dnsv4_fd, EV_READ); + ++success; } #endif + ///////////////////////////////////////////////////////////////////////////// + + if (!success) + { + slog (L_ERR, _("no protocols enabled.")); + return -1; + } + + 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'."), conf.ifname); + return -1; } - 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."), + tap->if_up ()); + return -1; + } + + cb.set (this); + if (!run_script (cb, true)) + { + slog (L_ERR, _("if-up command execution failed.")); + return -1; + } + + tap_ev_watcher.start (tap->fd, EV_READ); return 0; } -// send a vpn packet out to other hosts bool -vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) +vpn::drop_privileges () { - switch (si.prot) + if (::conf.change_root) { - case PROT_IPv4: - return send_ipv4_packet (pkt, si, tos); + if (!strcmp (::conf.change_root, "/")) + { + char dir [L_tmpnam]; + if (!tmpnam (dir)) + { + slog (L_CRIT, _("unable to create anonymous root path.")); + return false; + } - case PROT_UDPv4: - return send_udpv4_packet (pkt, si, tos); + if (mkdir (dir, 0700)) + { + slog (L_CRIT, _("unable to create anonymous root directory.")); + return false; + } -#if ENABLE_TCP - case PROT_TCPv4: - return send_tcpv4_packet (pkt, si, tos); -#endif + if (chdir (dir)) + { + slog (L_CRIT, _("unable to change to anonymous root directory.")); + return false; + } -#if ENABLE_ICMP - case PROT_ICMPv4: - return send_icmpv4_packet (pkt, si, tos); -#endif + if (rmdir (dir)) + slog (L_ERR, _("unable to remove anonymous root directory, continuing.")); + } + else + { + if (chdir (::conf.change_root)) + { + slog (L_CRIT, _("%s: unable to change to specified root directory."), ::conf.change_root); + return false; + } + } - default: - slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); - return false; + if (chroot (".")) + { + slog (L_CRIT, _("unable to set new root directory.")); + return false; + } + + if (chdir ("/")) + { + slog (L_CRIT, _("unable to set cwd to new root directory.")); + return false; + } } + + if (::conf.change_gid) + if (setgid (::conf.change_gid)) + { + slog (L_CRIT, _("unable to change group id to %d."), ::conf.change_gid); + return false; + } + + if (::conf.change_uid) + if (setuid (::conf.change_uid)) + { + slog (L_CRIT, _("unable to change user id to %d."), ::conf.change_uid); + return false; + } + + return true; } 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 - sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); + set_tos (ipv4_fd, ipv4_tos, tos); + xsendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); return true; } @@ -307,10 +526,6 @@ 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]); @@ -319,7 +534,8 @@ hdr->checksum = 0; hdr->checksum = ipv4_checksum ((u16 *)hdr, pkt->len); - sendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); + set_tos (icmpv4_fd, icmpv4_tos, tos); + xsendto (icmpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); return true; } @@ -328,10 +544,8 @@ 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 - sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); + set_tos (udpv4_fd, udpv4_tos, tos); + xsendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); return true; } @@ -351,7 +565,7 @@ // 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, true); + (*c)->inject_data_packet (pkt); } } @@ -361,23 +575,20 @@ 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)"), - (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)"), + 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) - slog (L_WARN, _("%s(%s): received broadcast (protocol violation)"), + slog (L_WARN, _("%s(%s): received broadcast (protocol violation)."), c->conf->nodename, (const char *)rsi); else if (dst != THISNODE->id) { @@ -386,7 +597,7 @@ conns[dst - 1]->inject_vpn_packet (pkt); else slog (L_WARN, - _("%s(%s): forwarding request (=> %s), but we are no router"), + _("%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); } @@ -395,10 +606,40 @@ } } -void -vpn::ipv4_ev (io_watcher &w, short revents) +bool +vpn::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) { - if (revents & (POLLIN | POLLERR)) + 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 & EV_READ) { vpn_packet *pkt = new vpn_packet; struct sockaddr_in sa; @@ -413,40 +654,33 @@ { pkt->len = len; - // raw sockets deliver the ipv4, but don't expect it on sends - // this is slow, but... - pkt->skip_hdr (IP_OVERHEAD); + // raw sockets deliver the ipv4 header, but don't expect it on sends + pkt->skip_hdr (pkt->ipv4_hdr_len ()); 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"), - revents); - exit (1); + _("FATAL: unknown revents %08x in socket, exiting.\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; @@ -468,7 +702,7 @@ { // raw sockets deliver the ipv4, but don't expect it on sends // this is slow, but... - pkt->skip_hdr (ICMP_OVERHEAD); + pkt->skip_hdr (pkt->ipv4_hdr_len () + (ICMP_OVERHEAD - IP_OVERHEAD)); recv_vpn_packet (pkt, si); } @@ -476,31 +710,25 @@ 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 icmpv4 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 -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; @@ -520,30 +748,24 @@ else { // probably ECONNRESET or somesuch - slog (L_DEBUG, _("%s: fd %d, %s"), (const char *)si, w.fd, strerror (errno)); + slog (L_DEBUG, _("%s: fd %d, %s."), (const char *)si, w.fd, 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"), + _("FATAL: unknown revents %08x in socket, exiting.\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; @@ -560,14 +782,14 @@ 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 ()) @@ -578,17 +800,12 @@ 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) { @@ -597,25 +814,20 @@ 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 @@ -635,51 +847,108 @@ connection_init (); - for (configuration::node_vector::iterator i = conf.nodes.begin (); - i != conf.nodes.end (); ++i) - { - connection *conn = new connection (this); + for (configuration::node_vector::iterator i = conf.nodes.begin (); i != conf.nodes.end (); ++i) + conns.push_back (new connection (this, *i)); - conn->conf = *i; - conns.push_back (conn); + for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) + (*c)->establish_connection (); +} - conn->establish_connection (); - } +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 ())); } -connection *vpn::find_router () +// only works for indirect and routed connections: find a router +// from THISNODE to dst +connection * +vpn::find_router_for (const connection *dst) { - u32 prio = 1; connection *router = 0; + // first try to find a router with a direct connection, route there + // regardless of any other considerations. + { + 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 + && can_direct (c->conf, dst->conf) + && c->ictx && c->octx) + { + prio = c->conf->routerprio; + router = c; + } + } + } + + if (router) + return router; + + // second try find the router with the highest priority, higher than ours + { + u32 prio = THISNODE->routerprio ? THISNODE->routerprio : 1; + + for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) + { + connection *c = *i; + + if (c->conf->routerprio > prio + && c != dst + && c->conf != THISNODE + && c->ictx && c->octx) + { + prio = c->conf->routerprio; + router = c; + } + } + } + + 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 // so we don't drop the connection if in use - && c->ictx && c->octx - && c->conf != THISNODE) // redundant, since ictx==octx==0 always on thisnode + if (o->si.valid () + && c->si != o->si + && c == find_router_for (o) + && !can_direct (THISNODE, o->conf)) { - 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::send_connect_request (int id) +void +vpn::send_connect_request (connection *c) { - connection *c = find_router (); + connection *r = find_router_for (c); - if (c) - c->send_connect_request (id); + if (r) + { + slog (L_TRACE, _("%s: no address known, sending mediated connection request via %s."), + c->conf->nodename, r->conf->nodename); + r->send_connect_request (c->conf->id); + } else - // no router found, aggressively connect to all routers - for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) - if ((*i)->conf->routerprio && (*i)->conf != THISNODE) - (*i)->establish_connection (); + slog (L_DEBUG, _("%s: no way to connect and no router found: unable to connect at this time."), + c->conf->nodename); } void @@ -690,14 +959,12 @@ 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 (); @@ -706,17 +973,20 @@ } 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 ()