tinc/src/net_socket.c

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/*
net_socket.c -- Handle various kinds of sockets.
Copyright (C) 1998-2005 Ivo Timmermans,
2013-01-20 20:03:22 +00:00
2000-2013 Guus Sliepen <guus@tinc-vpn.org>
2006 Scott Lamb <slamb@slamb.org>
2009 Florian Forster <octo@verplant.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
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
#include "conf.h"
#include "connection.h"
#include "control_common.h"
#include "list.h"
#include "logger.h"
#include "meta.h"
#include "names.h"
#include "net.h"
#include "netutl.h"
#include "protocol.h"
#include "utils.h"
#include "xalloc.h"
/* Needed on Mac OS/X */
#ifndef SOL_TCP
#define SOL_TCP IPPROTO_TCP
#endif
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int addressfamily = AF_UNSPEC;
int maxtimeout = 900;
int seconds_till_retry = 5;
int udp_rcvbuf = 0;
int udp_sndbuf = 0;
listen_socket_t listen_socket[MAXSOCKETS];
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int listen_sockets;
#ifndef HAVE_MINGW
io_t unix_socket;
#endif
list_t *outgoing_list = NULL;
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/* Setup sockets */
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static void configure_tcp(connection_t *c) {
int option;
#ifdef O_NONBLOCK
int flags = fcntl(c->socket, F_GETFL);
if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "fcntl for %s: %s", c->hostname, strerror(errno));
}
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#elif defined(WIN32)
unsigned long arg = 1;
if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
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logger(DEBUG_ALWAYS, LOG_ERR, "ioctlsocket for %s: %s", c->hostname, sockstrerror(sockerrno));
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}
#endif
#if defined(SOL_TCP) && defined(TCP_NODELAY)
option = 1;
setsockopt(c->socket, SOL_TCP, TCP_NODELAY, (void *)&option, sizeof option);
#endif
#if defined(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY)
option = IPTOS_LOWDELAY;
setsockopt(c->socket, SOL_IP, IP_TOS, (void *)&option, sizeof option);
#endif
}
static bool bind_to_interface(int sd) {
char *iface;
#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
struct ifreq ifr;
int status;
#endif /* defined(SOL_SOCKET) && defined(SO_BINDTODEVICE) */
if(!get_config_string (lookup_config (config_tree, "BindToInterface"), &iface))
return true;
#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
ifr.ifr_ifrn.ifrn_name[IFNAMSIZ - 1] = 0;
status = setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof(ifr));
if(status) {
logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
strerror(errno));
return false;
}
#else /* if !defined(SOL_SOCKET) || !defined(SO_BINDTODEVICE) */
logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "BindToInterface");
#endif
return true;
}
int setup_listen_socket(const sockaddr_t *sa) {
int nfd;
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char *addrstr;
int option;
char *iface;
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nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
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if(nfd < 0) {
logger(DEBUG_STATUS, LOG_ERR, "Creating metasocket failed: %s", sockstrerror(sockerrno));
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return -1;
}
#ifdef FD_CLOEXEC
fcntl(nfd, F_SETFD, FD_CLOEXEC);
#endif
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/* Optimize TCP settings */
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option = 1;
setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
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#if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
if(sa->sa.sa_family == AF_INET6)
setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
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#endif
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if(get_config_string
(lookup_config(config_tree, "BindToInterface"), &iface)) {
#if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
struct ifreq ifr;
memset(&ifr, 0, sizeof ifr);
strncpy(ifr.ifr_ifrn.ifrn_name, iface, IFNAMSIZ);
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if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, (void *)&ifr, sizeof ifr)) {
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closesocket(nfd);
logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to interface %s: %s", iface,
strerror(sockerrno));
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return -1;
}
#else
logger(DEBUG_ALWAYS, LOG_WARNING, "%s not supported on this platform", "BindToInterface");
#endif
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}
if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
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closesocket(nfd);
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addrstr = sockaddr2hostname(sa);
logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
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free(addrstr);
return -1;
}
if(listen(nfd, 3)) {
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closesocket(nfd);
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "listen", sockstrerror(sockerrno));
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return -1;
}
return nfd;
}
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int setup_vpn_in_socket(const sockaddr_t *sa) {
int nfd;
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char *addrstr;
int option;
nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
if(nfd < 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "Creating UDP socket failed: %s", sockstrerror(sockerrno));
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return -1;
}
#ifdef FD_CLOEXEC
fcntl(nfd, F_SETFD, FD_CLOEXEC);
#endif
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#ifdef O_NONBLOCK
{
int flags = fcntl(nfd, F_GETFL);
if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0) {
closesocket(nfd);
logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "fcntl",
strerror(errno));
return -1;
}
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}
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#elif defined(WIN32)
{
unsigned long arg = 1;
if(ioctlsocket(nfd, FIONBIO, &arg) != 0) {
closesocket(nfd);
logger(DEBUG_ALWAYS, LOG_ERR, "Call to `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
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return -1;
}
}
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#endif
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option = 1;
setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof option);
if(udp_rcvbuf && setsockopt(nfd, SOL_SOCKET, SO_RCVBUF, (void *)&udp_rcvbuf, sizeof(udp_rcvbuf)))
logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_RCVBUF to %i: %s", udp_rcvbuf, strerror(errno));
if(udp_sndbuf && setsockopt(nfd, SOL_SOCKET, SO_SNDBUF, (void *)&udp_sndbuf, sizeof(udp_sndbuf)))
logger(DEBUG_ALWAYS, LOG_WARNING, "Can't set UDP SO_SNDBUF to %i: %s", udp_sndbuf, strerror(errno));
#if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
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if(sa->sa.sa_family == AF_INET6)
setsockopt(nfd, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
#endif
#if defined(IP_DONTFRAG) && !defined(IP_DONTFRAGMENT)
#define IP_DONTFRAGMENT IP_DONTFRAG
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#endif
#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
if(myself->options & OPTION_PMTU_DISCOVERY) {
option = IP_PMTUDISC_DO;
setsockopt(nfd, SOL_IP, IP_MTU_DISCOVER, (void *)&option, sizeof(option));
}
#elif defined(IPPROTO_IP) && defined(IP_DONTFRAGMENT)
if(myself->options & OPTION_PMTU_DISCOVERY) {
option = 1;
setsockopt(nfd, IPPROTO_IP, IP_DONTFRAGMENT, (void *)&option, sizeof(option));
}
#else
#warning No way to disable IPv4 fragmentation
#endif
#if defined(SOL_IPV6) && defined(IPV6_MTU_DISCOVER) && defined(IPV6_PMTUDISC_DO)
if(myself->options & OPTION_PMTU_DISCOVERY) {
option = IPV6_PMTUDISC_DO;
setsockopt(nfd, SOL_IPV6, IPV6_MTU_DISCOVER, (void *)&option, sizeof(option));
}
#elif defined(IPPROTO_IPV6) && defined(IPV6_DONTFRAG)
if(myself->options & OPTION_PMTU_DISCOVERY) {
option = 1;
setsockopt(nfd, IPPROTO_IPV6, IPV6_DONTFRAG, (void *)&option, sizeof(option));
}
#else
#warning No way to disable IPv6 fragmentation
#endif
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if (!bind_to_interface(nfd)) {
closesocket(nfd);
return -1;
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}
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if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
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closesocket(nfd);
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addrstr = sockaddr2hostname(sa);
logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/udp: %s", addrstr, sockstrerror(sockerrno));
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free(addrstr);
return -1;
}
return nfd;
} /* int setup_vpn_in_socket */
static void retry_outgoing_handler(void *data) {
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setup_outgoing_connection(data);
}
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void retry_outgoing(outgoing_t *outgoing) {
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outgoing->timeout += 5;
if(outgoing->timeout > maxtimeout)
outgoing->timeout = maxtimeout;
timeout_add(&outgoing->ev, retry_outgoing_handler, outgoing, &(struct timeval){outgoing->timeout, rand() % 100000});
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logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Trying to re-establish outgoing connection in %d seconds", outgoing->timeout);
}
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void finish_connecting(connection_t *c) {
logger(DEBUG_CONNECTIONS, LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
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c->last_ping_time = time(NULL);
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c->status.connecting = false;
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send_id(c);
}
static void do_outgoing_pipe(connection_t *c, char *command) {
#ifndef HAVE_MINGW
int fd[2];
if(socketpair(AF_UNIX, SOCK_STREAM, 0, fd)) {
logger(DEBUG_ALWAYS, LOG_ERR, "Could not create socketpair: %s", strerror(errno));
return;
}
if(fork()) {
c->socket = fd[0];
close(fd[1]);
logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Using proxy %s", command);
return;
}
close(0);
close(1);
close(fd[0]);
dup2(fd[1], 0);
dup2(fd[1], 1);
close(fd[1]);
// Other filedescriptors should be closed automatically by CLOEXEC
char *host = NULL;
char *port = NULL;
sockaddr2str(&c->address, &host, &port);
setenv("REMOTEADDRESS", host, true);
setenv("REMOTEPORT", port, true);
setenv("NODE", c->name, true);
setenv("NAME", myself->name, true);
if(netname)
setenv("NETNAME", netname, true);
int result = system(command);
if(result < 0)
logger(DEBUG_ALWAYS, LOG_ERR, "Could not execute %s: %s", command, strerror(errno));
else if(result)
logger(DEBUG_ALWAYS, LOG_ERR, "%s exited with non-zero status %d", command, result);
exit(result);
#else
logger(DEBUG_ALWAYS, LOG_ERR, "Proxy type exec not supported on this platform!");
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return;
#endif
}
static void handle_meta_write(connection_t *c) {
if(c->outbuf.len <= c->outbuf.offset)
return;
ssize_t outlen = send(c->socket, c->outbuf.data + c->outbuf.offset, c->outbuf.len - c->outbuf.offset, 0);
if(outlen <= 0) {
if(!errno || errno == EPIPE) {
logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)", c->name, c->hostname);
} else if(sockwouldblock(sockerrno)) {
logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Sending %d bytes to %s (%s) would block", c->outbuf.len - c->outbuf.offset, c->name, c->hostname);
return;
} else {
logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not send %d bytes of data to %s (%s): %s", c->outbuf.len - c->outbuf.offset, c->name, c->hostname, strerror(errno));
}
terminate_connection(c, c->status.active);
return;
}
buffer_read(&c->outbuf, outlen);
if(!c->outbuf.len)
io_set(&c->io, IO_READ);
}
static void handle_meta_io(void *data, int flags) {
connection_t *c = data;
if(c->status.connecting) {
c->status.connecting = false;
int result;
socklen_t len = sizeof result;
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getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&result, &len);
if(!result)
finish_connecting(c);
else {
logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Error while connecting to %s (%s): %s", c->name, c->hostname, sockstrerror(result));
terminate_connection(c, false);
return;
}
}
if(flags & IO_WRITE)
handle_meta_write(c);
else
handle_meta_connection_data(c);
}
bool do_outgoing_connection(outgoing_t *outgoing) {
char *address, *port, *space;
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struct addrinfo *proxyai = NULL;
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int result;
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begin:
if(!outgoing->ai) {
if(!outgoing->cfg) {
logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not set up a meta connection to %s", outgoing->name);
retry_outgoing(outgoing);
return false;
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}
get_config_string(outgoing->cfg, &address);
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space = strchr(address, ' ');
if(space) {
port = xstrdup(space + 1);
*space = 0;
} else {
if(!get_config_string(lookup_config(outgoing->config_tree, "Port"), &port))
port = xstrdup("655");
}
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outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
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free(address);
free(port);
outgoing->aip = outgoing->ai;
outgoing->cfg = lookup_config_next(outgoing->config_tree, outgoing->cfg);
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}
if(!outgoing->aip) {
if(outgoing->ai)
freeaddrinfo(outgoing->ai);
outgoing->ai = NULL;
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goto begin;
}
connection_t *c = new_connection();
c->outgoing = outgoing;
memcpy(&c->address, outgoing->aip->ai_addr, outgoing->aip->ai_addrlen);
outgoing->aip = outgoing->aip->ai_next;
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c->hostname = sockaddr2hostname(&c->address);
logger(DEBUG_CONNECTIONS, LOG_INFO, "Trying to connect to %s (%s)", outgoing->name, c->hostname);
if(!proxytype) {
c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
configure_tcp(c);
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} else if(proxytype == PROXY_EXEC) {
do_outgoing_pipe(c, proxyhost);
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} else {
proxyai = str2addrinfo(proxyhost, proxyport, SOCK_STREAM);
if(!proxyai) {
free_connection(c);
goto begin;
}
logger(DEBUG_CONNECTIONS, LOG_INFO, "Using proxy at %s port %s", proxyhost, proxyport);
c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP);
configure_tcp(c);
}
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if(c->socket == -1) {
logger(DEBUG_CONNECTIONS, LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno));
free_connection(c);
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goto begin;
}
#ifdef FD_CLOEXEC
fcntl(c->socket, F_SETFD, FD_CLOEXEC);
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#endif
if(proxytype != PROXY_EXEC) {
#if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
int option = 1;
if(c->address.sa.sa_family == AF_INET6)
setsockopt(c->socket, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
#endif
bind_to_interface(c->socket);
}
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/* Connect */
if(!proxytype) {
result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
} else if(proxytype == PROXY_EXEC) {
result = 0;
} else {
result = connect(c->socket, proxyai->ai_addr, proxyai->ai_addrlen);
freeaddrinfo(proxyai);
}
if(result == -1 && !sockinprogress(sockerrno)) {
logger(DEBUG_CONNECTIONS, LOG_ERR, "Could not connect to %s (%s): %s", outgoing->name, c->hostname, sockstrerror(sockerrno));
free_connection(c);
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goto begin;
}
/* Now that there is a working socket, fill in the rest and register this connection. */
c->status.connecting = true;
c->name = xstrdup(outgoing->name);
c->outcipher = myself->connection->outcipher;
c->outdigest = myself->connection->outdigest;
c->outmaclength = myself->connection->outmaclength;
c->outcompression = myself->connection->outcompression;
c->last_ping_time = time(NULL);
connection_add(c);
io_add(&c->io, handle_meta_io, c, c->socket, IO_READ|IO_WRITE);
return true;
}
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void setup_outgoing_connection(outgoing_t *outgoing) {
timeout_del(&outgoing->ev);
node_t *n = lookup_node(outgoing->name);
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if(n && n->connection) {
logger(DEBUG_CONNECTIONS, LOG_INFO, "Already connected to %s", outgoing->name);
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n->connection->outgoing = outgoing;
return;
}
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init_configuration(&outgoing->config_tree);
read_host_config(outgoing->config_tree, outgoing->name);
outgoing->cfg = lookup_config(outgoing->config_tree, "Address");
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if(!outgoing->cfg) {
logger(DEBUG_ALWAYS, LOG_ERR, "No address specified for %s", outgoing->name);
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return;
}
do_outgoing_connection(outgoing);
}
/*
accept a new tcp connect and create a
new connection
*/
void handle_new_meta_connection(void *data, int flags) {
listen_socket_t *l = data;
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connection_t *c;
sockaddr_t sa;
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int fd;
socklen_t len = sizeof sa;
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fd = accept(l->tcp.fd, &sa.sa, &len);
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if(fd < 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
return;
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}
sockaddrunmap(&sa);
c = new_connection();
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c->name = xstrdup("<unknown>");
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c->outcipher = myself->connection->outcipher;
c->outdigest = myself->connection->outdigest;
c->outmaclength = myself->connection->outmaclength;
c->outcompression = myself->connection->outcompression;
c->address = sa;
c->hostname = sockaddr2hostname(&sa);
c->socket = fd;
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c->last_ping_time = time(NULL);
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logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection from %s", c->hostname);
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io_add(&c->io, handle_meta_io, c, c->socket, IO_READ);
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configure_tcp(c);
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connection_add(c);
c->allow_request = ID;
send_id(c);
}
#ifndef HAVE_MINGW
/*
accept a new UNIX socket connection
*/
void handle_new_unix_connection(void *data, int flags) {
io_t *io = data;
connection_t *c;
sockaddr_t sa;
int fd;
socklen_t len = sizeof sa;
fd = accept(io->fd, &sa.sa, &len);
if(fd < 0) {
logger(DEBUG_ALWAYS, LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
return;
}
sockaddrunmap(&sa);
c = new_connection();
c->name = xstrdup("<control>");
c->address = sa;
c->hostname = xstrdup("localhost port unix");
c->socket = fd;
c->last_ping_time = time(NULL);
logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection from %s", c->hostname);
io_add(&c->io, handle_meta_io, c, c->socket, IO_READ);
connection_add(c);
c->allow_request = ID;
send_id(c);
}
#endif
static void free_outgoing(outgoing_t *outgoing) {
timeout_del(&outgoing->ev);
if(outgoing->ai)
freeaddrinfo(outgoing->ai);
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if(outgoing->config_tree)
exit_configuration(&outgoing->config_tree);
if(outgoing->name)
free(outgoing->name);
free(outgoing);
}
void try_outgoing_connections(void) {
/* If there is no outgoing list yet, create one. Otherwise, mark all outgoings as deleted. */
if(!outgoing_list) {
outgoing_list = list_alloc((list_action_t)free_outgoing);
} else {
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for list_each(outgoing_t, outgoing, outgoing_list)
outgoing->timeout = -1;
}
/* Make sure there is one outgoing_t in the list for each ConnectTo. */
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for(config_t *cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg)) {
char *name;
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get_config_string(cfg, &name);
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if(!check_id(name)) {
logger(DEBUG_ALWAYS, LOG_ERR,
"Invalid name for outgoing connection in %s line %d",
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cfg->file, cfg->line);
free(name);
continue;
}
bool found = false;
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for list_each(outgoing_t, outgoing, outgoing_list) {
if(!strcmp(outgoing->name, name)) {
found = true;
outgoing->timeout = 0;
break;
}
}
if(!found) {
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outgoing_t *outgoing = xmalloc_and_zero(sizeof *outgoing);
outgoing->name = name;
list_insert_tail(outgoing_list, outgoing);
setup_outgoing_connection(outgoing);
}
}
/* Terminate any connections whose outgoing_t is to be deleted. */
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for list_each(connection_t, c, connection_list) {
if(c->outgoing && c->outgoing->timeout == -1) {
c->outgoing = NULL;
logger(DEBUG_CONNECTIONS, LOG_INFO, "No more outgoing connection to %s", c->name);
terminate_connection(c, c->status.active);
}
}
/* Delete outgoing_ts for which there is no ConnectTo. */
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for list_each(outgoing_t, outgoing, outgoing_list)
if(outgoing->timeout == -1)
list_delete_node(outgoing_list, node);
}