/*
net_socket.c -- Handle various kinds of sockets.
- Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
+ Copyright (C) 2014-2017 Guus Sliepen <guus@meshlink.io>
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
#define SOL_TCP IPPROTO_TCP
#endif
-int addressfamily = AF_UNSPEC;
-int seconds_till_retry = 5;
-int max_connection_burst = 100;
+#ifndef MSG_NOSIGNAL
+#define MSG_NOSIGNAL 0
+#endif
+
+static const int max_connection_burst = 100;
/* Setup sockets */
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));
+ logger(c->mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "fcntl", strerror(errno));
}
+
#elif defined(WIN32)
unsigned long arg = 1;
if(ioctlsocket(c->socket, FIONBIO, &arg) != 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "ioctlsocket for %s: %s", c->hostname, sockstrerror(sockerrno));
+ logger(c->mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "ioctlsocket", sockstrerror(sockerrno));
}
-#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_address(meshlink_handle_t *mesh, connection_t *c) {
- int s = -1;
-
- for(int i = 0; i < mesh->listen_sockets && mesh->listen_socket[i].bindto; i++) {
- if(mesh->listen_socket[i].sa.sa.sa_family != c->address.sa.sa_family)
- continue;
- if(s >= 0)
- return false;
- s = i;
- }
-
- if(s < 0)
- return false;
-
- sockaddr_t sa = mesh->listen_socket[s].sa;
- if(sa.sa.sa_family == AF_INET)
- sa.in.sin_port = 0;
- else if(sa.sa.sa_family == AF_INET6)
- sa.in6.sin6_port = 0;
-
- if(bind(c->socket, &sa.sa, SALEN(sa.sa))) {
- logger(DEBUG_CONNECTIONS, LOG_WARNING, "Can't bind outgoing socket: %s", strerror(errno));
- return false;
- }
-
- return true;
-}
-
-int setup_listen_socket(const sockaddr_t *sa) {
- int nfd;
- char *addrstr;
- int option;
-
- nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
-
- if(nfd < 0) {
- logger(DEBUG_STATUS, LOG_ERR, "Creating metasocket failed: %s", sockstrerror(sockerrno));
- return -1;
- }
-
-#ifdef FD_CLOEXEC
- fcntl(nfd, F_SETFD, FD_CLOEXEC);
+#if defined(SOL_TCP) && defined(TCP_NODELAY)
+ int nodelay = 1;
+ setsockopt(c->socket, SOL_TCP, TCP_NODELAY, (void *)&nodelay, sizeof(nodelay));
#endif
- /* Optimize TCP settings */
-
- option = 1;
- setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
-
-#if defined(SOL_IPV6) && defined(IPV6_V6ONLY)
- if(sa->sa.sa_family == AF_INET6)
- setsockopt(nfd, SOL_IPV6, IPV6_V6ONLY, (void *)&option, sizeof option);
+#if defined(IP_TOS) && defined(IPTOS_LOWDELAY)
+ int lowdelay = IPTOS_LOWDELAY;
+ setsockopt(c->socket, IPPROTO_IP, IP_TOS, (void *)&lowdelay, sizeof(lowdelay));
#endif
-
- if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
- closesocket(nfd);
- addrstr = sockaddr2hostname(sa);
- logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/tcp: %s", addrstr, sockstrerror(sockerrno));
- free(addrstr);
- return -1;
- }
-
- if(listen(nfd, 3)) {
- closesocket(nfd);
- logger(DEBUG_ALWAYS, LOG_ERR, "System call `%s' failed: %s", "listen", sockstrerror(sockerrno));
- return -1;
- }
-
- return nfd;
}
-int setup_vpn_in_socket(meshlink_handle_t *mesh, const sockaddr_t *sa) {
- int nfd;
- 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));
- return -1;
- }
-
-#ifdef FD_CLOEXEC
- fcntl(nfd, F_SETFD, FD_CLOEXEC);
-#endif
-
-#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;
- }
- }
-#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));
- return -1;
- }
- }
-#endif
-
- option = 1;
- setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (void *)&option, sizeof option);
- setsockopt(nfd, SOL_SOCKET, SO_BROADCAST, (void *)&option, sizeof option);
-
-#if defined(IPPROTO_IPV6) && defined(IPV6_V6ONLY)
- 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
-#endif
-
-#if defined(SOL_IP) && defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DO)
- if(mesh->self->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(mesh->self->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(mesh->self->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(mesh->self->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
-
- if(bind(nfd, &sa->sa, SALEN(sa->sa))) {
- closesocket(nfd);
- addrstr = sockaddr2hostname(sa);
- logger(DEBUG_ALWAYS, LOG_ERR, "Can't bind to %s/udp: %s", addrstr, sockstrerror(sockerrno));
- free(addrstr);
- return -1;
- }
-
- return nfd;
-} /* int setup_vpn_in_socket */
-
static void retry_outgoing_handler(event_loop_t *loop, void *data) {
+ assert(data);
+
meshlink_handle_t *mesh = loop->data;
outgoing_t *outgoing = data;
setup_outgoing_connection(mesh, outgoing);
}
void retry_outgoing(meshlink_handle_t *mesh, outgoing_t *outgoing) {
- outgoing->timeout += 5;
+ if(!mesh->reachable && mesh->loop.now.tv_sec < mesh->last_unreachable + mesh->dev_class_traits[mesh->devclass].fast_retry_period) {
+ outgoing->timeout = 1;
+ } else {
+ outgoing->timeout += 5;
+ }
- if(outgoing->timeout > mesh->maxtimeout)
+ if(outgoing->timeout > mesh->maxtimeout) {
outgoing->timeout = mesh->maxtimeout;
+ }
- timeout_add(&mesh->loop, &outgoing->ev, retry_outgoing_handler, outgoing, &(struct timeval){outgoing->timeout, rand() % 100000});
+ timeout_add(&mesh->loop, &outgoing->ev, retry_outgoing_handler, outgoing, &(struct timespec) {
+ outgoing->timeout, prng(mesh, TIMER_FUDGE)
+ });
- logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Trying to re-establish outgoing connection in %d seconds", outgoing->timeout);
+ logger(mesh, MESHLINK_INFO, "Trying to re-establish outgoing connection in %d seconds", outgoing->timeout);
}
void finish_connecting(meshlink_handle_t *mesh, connection_t *c) {
- logger(DEBUG_CONNECTIONS, LOG_INFO, "Connected to %s (%s)", c->name, c->hostname);
+ logger(mesh, MESHLINK_INFO, "Connected to %s", c->name);
c->last_ping_time = mesh->loop.now.tv_sec;
c->status.connecting = false;
send_id(mesh, c);
}
-static void do_outgoing_pipe(meshlink_handle_t *mesh, 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);
+static void handle_meta_write(meshlink_handle_t *mesh, connection_t *c) {
+ if(c->outbuf.len <= c->outbuf.offset) {
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", mesh->self->name, 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!");
- return;
-#endif
-}
-
-static void handle_meta_write(meshlink_handle_t *mesh, 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, MSG_NOSIGNAL);
- 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);
+ logger(mesh, MESHLINK_INFO, "Connection closed by %s", c->name);
} 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);
+ logger(mesh, MESHLINK_DEBUG, "Sending %lu bytes to %s would block", (unsigned long)(c->outbuf.len - c->outbuf.offset), c->name);
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));
+ logger(mesh, MESHLINK_ERROR, "Could not send %lu bytes of data to %s: %s", (unsigned long)(c->outbuf.len - c->outbuf.offset), c->name, strerror(errno));
}
terminate_connection(mesh, c, c->status.active);
}
buffer_read(&c->outbuf, outlen);
- if(!c->outbuf.len)
+
+ if(!c->outbuf.len) {
io_set(&mesh->loop, &c->io, IO_READ);
+ }
}
static void handle_meta_io(event_loop_t *loop, void *data, int flags) {
c->status.connecting = false;
int result;
- socklen_t len = sizeof result;
+ socklen_t len = sizeof(result);
getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&result, &len);
- if(!result)
+ if(!result) {
finish_connecting(mesh, c);
- else {
- logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Error while connecting to %s (%s): %s", c->name, c->hostname, sockstrerror(result));
+ } else {
+ logger(mesh, MESHLINK_DEBUG, "Error while connecting to %s: %s", c->name, sockstrerror(result));
terminate_connection(mesh, c, false);
return;
}
}
- if(flags & IO_WRITE)
+ if(flags & IO_WRITE) {
handle_meta_write(mesh, c);
- else
+ } else {
handle_meta_connection_data(mesh, c);
+ }
}
-bool do_outgoing_connection(meshlink_handle_t *mesh, outgoing_t *outgoing) {
- char *address, *port, *space;
- struct addrinfo *proxyai = NULL;
- int result;
+// Find edges pointing to this node, and use them to build a list of unique, known addresses.
+static struct addrinfo *get_known_addresses(node_t *n) {
+ struct addrinfo *ai = NULL;
-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(mesh, outgoing);
- return false;
+ for splay_each(edge_t, e, n->edge_tree) {
+ if(!e->reverse) {
+ continue;
}
- get_config_string(outgoing->cfg, &address);
+ bool found = false;
- space = strchr(address, ' ');
- if(space) {
- port = xstrdup(space + 1);
- *space = 0;
+ for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
+ if(!sockaddrcmp(&e->reverse->address, (sockaddr_t *)aip->ai_addr)) {
+ found = true;
+ break;
+ }
+ }
+
+ if(found) {
+ continue;
+ }
+
+ // Create a new struct addrinfo, and put it at the head of the list.
+ struct addrinfo *nai = xzalloc(sizeof(*nai) + SALEN(e->reverse->address.sa));
+ nai->ai_next = ai;
+ ai = nai;
+
+ ai->ai_family = e->reverse->address.sa.sa_family;
+ ai->ai_socktype = SOCK_STREAM;
+ ai->ai_protocol = IPPROTO_TCP;
+ ai->ai_addrlen = SALEN(e->reverse->address.sa);
+ ai->ai_addr = (struct sockaddr *)(nai + 1);
+ memcpy(ai->ai_addr, &e->reverse->address, ai->ai_addrlen);
+ }
+
+ return ai;
+}
+
+// Build a list of recently seen addresses.
+static struct addrinfo *get_recent_addresses(node_t *n) {
+ struct addrinfo *ai = NULL;
+ struct addrinfo *aip;
+
+ for(int i = 0; i < 5; i++) {
+ if(!n->recent[i].sa.sa_family) {
+ break;
+ }
+
+ // Create a new struct addrinfo, and put it at the end of the list.
+ struct addrinfo *nai = xzalloc(sizeof(*nai) + SALEN(n->recent[i].sa));
+
+ if(!ai) {
+ ai = nai;
} else {
- // TODO: Only allow Address statements?
- if(!get_config_string(lookup_config(outgoing->config_tree, "Port"), &port))
- port = xstrdup("655");
+ aip->ai_next = nai;
}
- outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
+ aip = nai;
+
+ nai->ai_family = n->recent[i].sa.sa_family;
+ nai->ai_socktype = SOCK_STREAM;
+ nai->ai_protocol = IPPROTO_TCP;
+ nai->ai_addrlen = SALEN(n->recent[i].sa);
+ nai->ai_addr = (struct sockaddr *)(nai + 1);
+ memcpy(nai->ai_addr, &n->recent[i], nai->ai_addrlen);
+ }
+
+ return ai;
+}
+
+// Free struct addrinfo list from get_known_addresses().
+static void free_known_addresses(struct addrinfo *ai) {
+ for(struct addrinfo *aip = ai, *next; aip; aip = next) {
+ next = aip->ai_next;
+ free(aip);
+ }
+}
+
+static struct addrinfo *get_canonical_address(node_t *n) {
+ if(!n->canonical_address) {
+ return false;
+ }
+
+ char *address = xstrdup(n->canonical_address);
+ char *port = strchr(address, ' ');
+
+ if(!port) {
free(address);
- free(port);
+ return false;
+ }
+
+ *port++ = 0;
+
+ struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
+ free(address);
+
+ return ai;
+}
+
+static bool get_next_outgoing_address(meshlink_handle_t *mesh, outgoing_t *outgoing) {
+ (void)mesh;
- outgoing->aip = outgoing->ai;
- outgoing->cfg = lookup_config_next(outgoing->config_tree, outgoing->cfg);
+ bool start = false;
+
+ if(outgoing->state == OUTGOING_START) {
+ start = true;
+ outgoing->state = OUTGOING_CANONICAL;
}
- if(!outgoing->aip) {
- if(outgoing->ai)
- freeaddrinfo(outgoing->ai);
+ if(outgoing->state == OUTGOING_CANONICAL) {
+ if(!outgoing->aip) {
+ outgoing->ai = get_canonical_address(outgoing->node);
+ outgoing->aip = outgoing->ai;
+ } else {
+ outgoing->aip = outgoing->aip->ai_next;
+ }
+
+ if(outgoing->aip) {
+ return true;
+ }
+
+ freeaddrinfo(outgoing->ai);
outgoing->ai = NULL;
- goto begin;
+ outgoing->aip = NULL;
+ outgoing->state = OUTGOING_RECENT;
+ }
+
+ if(outgoing->state == OUTGOING_RECENT) {
+ if(!outgoing->aip) {
+ outgoing->ai = get_recent_addresses(outgoing->node);
+ outgoing->aip = outgoing->ai;
+ } else {
+ outgoing->aip = outgoing->aip->ai_next;
+ }
+
+ if(outgoing->aip) {
+ return true;
+ }
+
+ free_known_addresses(outgoing->ai);
+ outgoing->ai = NULL;
+ outgoing->aip = NULL;
+ outgoing->state = OUTGOING_KNOWN;
+ }
+
+ if(outgoing->state == OUTGOING_KNOWN) {
+ if(!outgoing->aip) {
+ outgoing->ai = get_known_addresses(outgoing->node);
+ outgoing->aip = outgoing->ai;
+ } else {
+ outgoing->aip = outgoing->aip->ai_next;
+ }
+
+ if(outgoing->aip) {
+ return true;
+ }
+
+ free_known_addresses(outgoing->ai);
+ outgoing->ai = NULL;
+ outgoing->aip = NULL;
+ outgoing->state = OUTGOING_END;
+ }
+
+ if(start) {
+ outgoing->state = OUTGOING_NO_KNOWN_ADDRESSES;
+ }
+
+ return false;
+}
+
+void do_outgoing_connection(meshlink_handle_t *mesh, outgoing_t *outgoing) {
+ struct addrinfo *proxyai = NULL;
+ int result;
+
+begin:
+
+ if(!get_next_outgoing_address(mesh, outgoing)) {
+ if(outgoing->state == OUTGOING_NO_KNOWN_ADDRESSES) {
+ logger(mesh, MESHLINK_ERROR, "No known addresses for %s", outgoing->node->name);
+ } else {
+ logger(mesh, MESHLINK_ERROR, "Could not set up a meta connection to %s", outgoing->node->name);
+ retry_outgoing(mesh, outgoing);
+ }
+
+ return;
}
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;
- c->hostname = sockaddr2hostname(&c->address);
+ char *hostname = sockaddr2hostname(&c->address);
- logger(DEBUG_CONNECTIONS, LOG_INFO, "Trying to connect to %s (%s)", outgoing->name, c->hostname);
+ logger(mesh, MESHLINK_INFO, "Trying to connect to %s at %s", outgoing->node->name, hostname);
if(!mesh->proxytype) {
c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
configure_tcp(c);
- } else if(mesh->proxytype == PROXY_EXEC) {
- do_outgoing_pipe(mesh, c, mesh->proxyhost);
} else {
proxyai = str2addrinfo(mesh->proxyhost, mesh->proxyport, SOCK_STREAM);
+
if(!proxyai) {
free_connection(c);
+ free(hostname);
goto begin;
}
- logger(DEBUG_CONNECTIONS, LOG_INFO, "Using proxy at %s port %s", mesh->proxyhost, mesh->proxyport);
+
+ logger(mesh, MESHLINK_INFO, "Using proxy at %s port %s", mesh->proxyhost, mesh->proxyport);
c->socket = socket(proxyai->ai_family, SOCK_STREAM, IPPROTO_TCP);
configure_tcp(c);
}
if(c->socket == -1) {
- logger(DEBUG_CONNECTIONS, LOG_ERR, "Creating socket for %s failed: %s", c->hostname, sockstrerror(sockerrno));
+ logger(mesh, MESHLINK_ERROR, "Creating socket for %s at %s failed: %s", c->name, hostname, sockstrerror(sockerrno));
free_connection(c);
+ free(hostname);
goto begin;
}
+ free(hostname);
+
#ifdef FD_CLOEXEC
fcntl(c->socket, F_SETFD, FD_CLOEXEC);
#endif
- if(mesh->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
+#if defined(IPV6_V6ONLY)
- bind_to_address(mesh, c);
+ if(c->address.sa.sa_family == AF_INET6) {
+ static const int option = 1;
+ setsockopt(c->socket, IPPROTO_IPV6, IPV6_V6ONLY, (void *)&option, sizeof(option));
}
+#endif
+
/* Connect */
if(!mesh->proxytype) {
result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
- } else if(mesh->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));
+ logger(mesh, MESHLINK_ERROR, "Could not connect to %s: %s", outgoing->node->name, sockstrerror(sockerrno));
free_connection(c);
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->outcompression = mesh->self->connection->outcompression;
+ c->status.initiator = true;
+ c->name = xstrdup(outgoing->node->name);
c->last_ping_time = mesh->loop.now.tv_sec;
connection_add(mesh, c);
- io_add(&mesh->loop, &c->io, handle_meta_io, c, c->socket, IO_READ|IO_WRITE);
-
- return true;
+ io_add(&mesh->loop, &c->io, handle_meta_io, c, c->socket, IO_READ | IO_WRITE);
}
-// Find edges pointing to this node, and use them to build a list of unique, known addresses.
-static struct addrinfo *get_known_addresses(node_t *n) {
- struct addrinfo *ai = NULL;
-
- for splay_each(edge_t, e, n->edge_tree) {
- if(!e->reverse)
- continue;
-
- bool found = false;
- for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
- if(!sockaddrcmp(&e->reverse->address, (sockaddr_t *)aip->ai_addr)) {
- found = true;
- break;
- }
+void reset_outgoing(outgoing_t *outgoing) {
+ if(outgoing->ai) {
+ if(outgoing->state == OUTGOING_RECENT || outgoing->state == OUTGOING_KNOWN) {
+ free_known_addresses(outgoing->ai);
+ } else {
+ freeaddrinfo(outgoing->ai);
}
- if(found)
- continue;
-
- struct addrinfo *nai = xzalloc(sizeof *nai);
- if(ai)
- ai->ai_next = nai;
- ai = nai;
- ai->ai_family = e->reverse->address.sa.sa_family;
- ai->ai_socktype = SOCK_STREAM;
- ai->ai_protocol = IPPROTO_TCP;
- ai->ai_addrlen = SALEN(e->reverse->address.sa);
- ai->ai_addr = xmalloc(ai->ai_addrlen);
- memcpy(ai->ai_addr, &e->reverse->address, ai->ai_addrlen);
}
- return ai;
+ outgoing->ai = NULL;
+ outgoing->aip = NULL;
+ outgoing->state = OUTGOING_START;
}
void setup_outgoing_connection(meshlink_handle_t *mesh, outgoing_t *outgoing) {
timeout_del(&mesh->loop, &outgoing->ev);
- node_t *n = lookup_node(mesh, outgoing->name);
-
- if(n && n->connection) {
- logger(DEBUG_CONNECTIONS, LOG_INFO, "Already connected to %s", outgoing->name);
+ if(outgoing->node->connection) {
+ logger(mesh, MESHLINK_INFO, "Already connected to %s", outgoing->node->name);
- n->connection->outgoing = outgoing;
+ outgoing->node->connection->outgoing = outgoing;
return;
}
- init_configuration(&outgoing->config_tree);
- read_host_config(mesh, outgoing->config_tree, outgoing->name);
- outgoing->cfg = lookup_config(outgoing->config_tree, "Address");
+ reset_outgoing(outgoing);
- if(!outgoing->cfg) {
- if(n)
- outgoing->aip = outgoing->ai = get_known_addresses(n);
- if(!outgoing->ai) {
- logger(DEBUG_ALWAYS, LOG_ERR, "No address known for %s", outgoing->name);
- return;
- }
+ if(outgoing->node->status.blacklisted) {
+ return;
+ }
+
+ if(mesh->connection_try_cb) {
+ mesh->connection_try_cb(mesh, (meshlink_node_t *)outgoing->node);
}
do_outgoing_connection(mesh, outgoing);
}
+/// Delayed close of a filedescriptor.
+static void tarpit(meshlink_handle_t *mesh, int fd) {
+ if(!fd) {
+ return;
+ }
+
+ if(mesh->pits[mesh->next_pit]) {
+ closesocket(mesh->pits[mesh->next_pit]);
+ }
+
+ mesh->pits[mesh->next_pit++] = fd;
+
+ if(mesh->next_pit >= (int)(sizeof mesh->pits / sizeof mesh->pits[0])) {
+ mesh->next_pit = 0;
+ }
+}
+
/*
accept a new tcp connect and create a
new connection
*/
void handle_new_meta_connection(event_loop_t *loop, void *data, int flags) {
+ (void)flags;
meshlink_handle_t *mesh = loop->data;
listen_socket_t *l = data;
connection_t *c;
sockaddr_t sa;
int fd;
- socklen_t len = sizeof sa;
+ socklen_t len = sizeof(sa);
+
+ memset(&sa, 0, sizeof(sa));
fd = accept(l->tcp.fd, &sa.sa, &len);
return;
}
- logger(DEBUG_ALWAYS, LOG_ERR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
+ logger(mesh, MESHLINK_ERROR, "Accepting a new connection failed: %s", sockstrerror(sockerrno));
return;
}
sockaddrunmap(&sa);
- // Check if we get many connections from the same host
-
- static sockaddr_t prev_sa;
- static int tarpit = -1;
+ /* Rate limit incoming connections to max_connection_burst/second. */
- if(tarpit >= 0) {
- closesocket(tarpit);
- tarpit = -1;
+ if(mesh->loop.now.tv_sec != mesh->connection_burst_time) {
+ mesh->connection_burst_time = mesh->loop.now.tv_sec;
+ mesh->connection_burst = 0;
}
- if(!sockaddrcmp_noport(&sa, &prev_sa)) {
- static int samehost_burst;
- static int samehost_burst_time;
-
- if(mesh->loop.now.tv_sec - samehost_burst_time > samehost_burst)
- samehost_burst = 0;
- else
- samehost_burst -= mesh->loop.now.tv_sec - samehost_burst_time;
-
- samehost_burst_time = mesh->loop.now.tv_sec;
- samehost_burst++;
-
- if(samehost_burst > max_connection_burst) {
- tarpit = fd;
- return;
- }
- }
-
- memcpy(&prev_sa, &sa, sizeof sa);
-
- // Check if we get many connections from different hosts
-
- static int connection_burst;
- static int connection_burst_time;
-
- if(mesh->loop.now.tv_sec - connection_burst_time > connection_burst)
- connection_burst = 0;
- else
- connection_burst -= mesh->loop.now.tv_sec - connection_burst_time;
-
- connection_burst_time = mesh->loop.now.tv_sec;
- connection_burst++;
-
- if(connection_burst >= max_connection_burst) {
- connection_burst = max_connection_burst;
- tarpit = fd;
+ if(mesh->connection_burst >= max_connection_burst) {
+ tarpit(mesh, fd);
return;
}
+ mesh->connection_burst++;
+
// Accept the new connection
c = new_connection();
c->name = xstrdup("<unknown>");
- c->outcompression = mesh->self->connection->outcompression;
c->address = sa;
- c->hostname = sockaddr2hostname(&sa);
c->socket = fd;
c->last_ping_time = mesh->loop.now.tv_sec;
- logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection from %s", c->hostname);
+ char *hostname = sockaddr2hostname(&sa);
+ logger(mesh, MESHLINK_INFO, "Connection from %s", hostname);
+ free(hostname);
io_add(&mesh->loop, &c->io, handle_meta_io, c, c->socket, IO_READ);
send_id(mesh, c);
}
-static void free_outgoing(meshlink_handle_t *mesh, outgoing_t *outgoing) {
- timeout_del(&mesh->loop, &outgoing->ev);
+static void free_outgoing(outgoing_t *outgoing) {
+ meshlink_handle_t *mesh = outgoing->node->mesh;
- if(outgoing->ai)
- freeaddrinfo(outgoing->ai);
-
- if(outgoing->config_tree)
- exit_configuration(&outgoing->config_tree);
+ timeout_del(&mesh->loop, &outgoing->ev);
- if(outgoing->name)
- free(outgoing->name);
+ if(outgoing->ai) {
+ if(outgoing->state == OUTGOING_RECENT || outgoing->state == OUTGOING_KNOWN) {
+ free_known_addresses(outgoing->ai);
+ } else {
+ freeaddrinfo(outgoing->ai);
+ }
+ }
free(outgoing);
}
-void try_outgoing_connections(meshlink_handle_t *mesh) {
- /* If there is no outgoing list yet, create one. Otherwise, mark all outgoings as deleted. */
-
- if(!mesh->outgoings) {
- mesh->outgoings = list_alloc((list_action_t)free_outgoing);
- } else {
- for list_each(outgoing_t, outgoing, mesh->outgoings)
- outgoing->timeout = -1;
- }
-
- /* Make sure there is one outgoing_t in the list for each ConnectTo. */
-
- // TODO: Drop support for ConnectTo since AutoConnect is now always on?
- for(config_t *cfg = lookup_config(mesh->config, "ConnectTo"); cfg; cfg = lookup_config_next(mesh->config, cfg)) {
- char *name;
- bool blacklisted;
- get_config_string(cfg, &name);
-
- if(!check_id(name)) {
- logger(DEBUG_ALWAYS, LOG_ERR,
- "Invalid name for outgoing connection in %s line %d",
- cfg->file, cfg->line);
- free(name);
- continue;
- }
-
- get_config_bool(lookup_config(mesh->config, "blacklisted"), &blacklisted);
- if (blacklisted)
- continue;
-
- bool found = false;
-
- for list_each(outgoing_t, outgoing, mesh->outgoings) {
- if(!strcmp(outgoing->name, name)) {
- found = true;
- outgoing->timeout = 0;
- break;
- }
- }
-
- if(!found) {
- outgoing_t *outgoing = xzalloc(sizeof *outgoing);
- outgoing->name = name;
- list_insert_tail(mesh->outgoings, outgoing);
- setup_outgoing_connection(mesh, outgoing);
- }
- }
-
- /* Terminate any connections whose outgoing_t is to be deleted. */
+void init_outgoings(meshlink_handle_t *mesh) {
+ mesh->outgoings = list_alloc((list_action_t)free_outgoing);
+}
- for list_each(connection_t, c, mesh->connections) {
- 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(mesh, c, c->status.active);
- }
+void exit_outgoings(meshlink_handle_t *mesh) {
+ if(mesh->outgoings) {
+ list_delete_list(mesh->outgoings);
+ mesh->outgoings = NULL;
}
-
- /* Delete outgoing_ts for which there is no ConnectTo. */
-
- for list_each(outgoing_t, outgoing, mesh->outgoings)
- if(outgoing->timeout == -1)
- list_delete_node(mesh->outgoings, node);
}
projects / meshlink / blobdiff