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net_io.c
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net_io.c
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// Part of readsb, a Mode-S/ADSB/TIS message decoder.
//
// net_io.c: network handling.
//
// Copyright (c) 2019 Michael Wolf <michael@mictronics.de>
//
// This code is based on a detached fork of dump1090-fa.
//
// Copyright (c) 2014-2016 Oliver Jowett <oliver@mutability.co.uk>
//
// This file 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
// any later version.
//
// This file 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 <http://www.gnu.org/licenses/>.
//
// This file incorporates work covered by the following copyright and
// license:
//
// Copyright (C) 2012 by Salvatore Sanfilippo <antirez@gmail.com>
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "readsb.h"
#include <assert.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <poll.h>
#include <sys/sendfile.h>
#include "uat2esnt/uat2esnt.h"
#define DLE 0x10
#define ETX 0x03
// ============================= Networking =============================
//
// read_fn typedef read_handler functions
static int handle_gpsd(struct client *c, char *p, int remote, int64_t now, struct messageBuffer *mb);
static int handleCommandSocket(struct client *c, char *p, int remote, int64_t now, struct messageBuffer *mb);
static int handleBeastCommand(struct client *c, char *p, int remote, int64_t now, struct messageBuffer *mb);
static int decodeBinMessage(struct client *c, char *p, int remote, int64_t now, struct messageBuffer *mb);
static int processHexMessage(struct client *c, char *hex, int remote, int64_t now, struct messageBuffer *mb);
static int decodeUatMessage(struct client *c, char *msg, int remote, int64_t now, struct messageBuffer *mb);
static int decodeSbsLine(struct client *c, char *line, int remote, int64_t now, struct messageBuffer *mb);
static int decodeAsterixMessage(struct client *c, char *p, int remote, int64_t now, struct messageBuffer *mb);
static int decodeSbsLineMlat(struct client *c, char *line, int remote, int64_t now, struct messageBuffer *mb) {
MODES_NOTUSED(remote);
return decodeSbsLine(c, line, 64 + SOURCE_MLAT, now, mb);
}
static int decodeSbsLinePrio(struct client *c, char *line, int remote, int64_t now, struct messageBuffer *mb) {
MODES_NOTUSED(remote);
return decodeSbsLine(c, line, 64 + SOURCE_PRIO, now, mb);
}
static int decodeSbsLineJaero(struct client *c, char *line, int remote, int64_t now, struct messageBuffer *mb) {
MODES_NOTUSED(remote);
return decodeSbsLine(c, line, 64 + SOURCE_JAERO, now, mb);
}
static int decodePfMessage(struct client *c, char *p, int remote, int64_t now, struct messageBuffer *mb);
// end read handlers
static void send_heartbeat(struct net_service *service);
static void autoset_modeac();
static void *pthreadGetaddrinfo(void *param);
static void modesCloseClient(struct client *c);
static int flushClient(struct client *c, int64_t now);
static char *read_uuid(struct client *c, char *p, char *eod);
static void modesReadFromClient(struct client *c, struct messageBuffer *mb);
static void drainMessageBuffer(struct messageBuffer *buf);
// ModeAC all zero messag
static const char beast_heartbeat_msg[] = {0x1a, '1', 0, 0, 0, 0, 0, 0, 0, 0, 0};
static const char raw_heartbeat_msg[] = "*0000;\n";
static const char sbs_heartbeat_msg[] = "\r\n"; // is there a better one?
// CAUTION: sizeof includes the trailing \0 byte
static const heartbeat_t beast_heartbeat = {
.msg = beast_heartbeat_msg,
.len = sizeof(beast_heartbeat_msg)
};
static const heartbeat_t raw_heartbeat = {
.msg = raw_heartbeat_msg,
.len = sizeof(raw_heartbeat_msg) - 1
};
static const heartbeat_t sbs_heartbeat = {
.msg = sbs_heartbeat_msg,
.len = sizeof(sbs_heartbeat_msg) - 1
};
static const heartbeat_t no_heartbeat = {
.msg = NULL,
.len = 0
};
//
//=========================================================================
//
// Networking "stack" initialization
//
// Init a service with the given read/write characteristics, return the new service.
// Doesn't arrange for the service to listen or connect
static struct net_service *serviceInit(struct net_service_group *group, const char *descr, struct net_writer *writer, heartbeat_t heartbeat_out, heartbeat_t heartbeat_in, read_mode_t mode, const char *sep, read_fn handler) {
if (!descr) {
fprintf(stderr, "Fatal: no service description\n");
exit(1);
}
if (!group->services) {
group->alloc = NET_SERVICE_GROUP_MAX;
group->services = cmalloc(group->alloc * sizeof(struct net_service));
}
if (!group->services) {
}
group->len++;
if (group->len + 1 > group->alloc) {
fprintf(stderr, "FATAL: Increase NET_SERVICE_GROUP_MAX\n");
exit(1);
}
struct net_service *service = &group->services[group->len - 1];
memset(service, 0, 2 * sizeof(struct net_service));
// also set the extra service to zero, zero terminatd array
service->group = group;
service->descr = descr;
service->listener_count = 0;
service->pusher_count = 0;
service->connections = 0;
service->writer = writer;
service->read_sep = sep;
service->read_sep_len = sep ? strlen(sep) : 0;
service->read_mode = mode;
service->read_handler = handler;
service->clients = NULL;
service->heartbeat_out = heartbeat_out;
service->heartbeat_in = heartbeat_in;
if (service->writer) {
if (service->writer->data) {
fprintf(stderr, "FATAL: serviceInit() called twice on the same service: %s\n", descr);
exit(1);
}
// set writer to zero
memset(service->writer, 0, sizeof(struct net_writer));
service->writer->data = cmalloc(MODES_OUT_BUF_SIZE);
service->writer->service = service;
service->writer->dataUsed = 0;
service->writer->lastWrite = mstime();
service->writer->lastReceiverId = 0;
service->writer->connections = 0;
}
return service;
}
static char *ais_charset = "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?";
static uint8_t char_to_ais(int ch)
{
char *match;
if (!ch)
return 32;
match = strchr(ais_charset, ch);
if (match)
return (uint8_t)(match - ais_charset);
else
return 32;
}
static int sendFiveHeartbeats(struct client *c, int64_t now) {
// send 5 heartbeats to signal that we are a client that can accomodate feedback .... some counterparts crash if they get stuff they don't understand
// this is really a crutch, but there is no other good way to signal this without causing issues
int repeats = 5;
const char *heartbeat_msg = c->service->heartbeat_out.msg;
int heartbeat_len = c->service->heartbeat_out.len;
if (heartbeat_msg && c->sendq && c->sendq_len + repeats * heartbeat_len < c->sendq_max) {
for (int k = 0; k < repeats; k++) {
memcpy(c->sendq + c->sendq_len, heartbeat_msg, heartbeat_len);
c->sendq_len += heartbeat_len;
}
}
return flushClient(c, now);
}
static void setProxyString(struct client *c) {
snprintf(c->proxy_string, sizeof(c->proxy_string), "%s port %s", c->host, c->port);
c->receiverId = fasthash64(c->proxy_string, strlen(c->proxy_string), 0x2127599bf4325c37ULL);
}
static int getSNDBUF(struct net_service *service) {
if (service->sendqOverrideSize) {
return service->sendqOverrideSize;
} else {
return (MODES_NET_SNDBUF_SIZE << Modes.net_sndbuf_size);
}
}
static int getRCVBUF(struct net_service *service) {
if (service->recvqOverrideSize) {
return service->recvqOverrideSize;
} else {
return (MODES_NET_SNDBUF_SIZE << Modes.net_sndbuf_size);
}
}
static void setBuffers(int fd, int sndsize, int rcvsize) {
if (sndsize > 0 && setsockopt(fd, SOL_SOCKET, SO_SNDBUF, (void*)&sndsize, sizeof(sndsize)) == -1) {
fprintf(stderr, "setsockopt SO_SNDBUF: %s", strerror(errno));
}
if (rcvsize > 0 && setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (void*)&rcvsize, sizeof(rcvsize)) == -1) {
fprintf(stderr, "setsockopt SO_RCVBUF: %s", strerror(errno));
}
}
// Create a client attached to the given service using the provided socket FD ... not a socket in some exceptions
static struct client *createSocketClient(struct net_service *service, int fd) {
struct client *c;
int64_t now = mstime();
if (!service || fd == -1) {
fprintf(stderr, "<3> FATAL: createSocketClient called with invalid parameters!\n");
exit(1);
}
if (!(c = (struct client *) cmalloc(sizeof (struct client)))) {
fprintf(stderr, "<3> FATAL: Out of memory allocating a new %s network client\n", service->descr);
exit(1);
}
memset(c, 0, sizeof (struct client));
c->service = service;
c->fd = fd;
c->last_flush = now;
c->last_send = now;
c->last_read = now;
c->connectedSince = now;
c->last_read_flush = now;
c->proxy_string[0] = '\0';
c->host[0] = '\0';
c->port[0] = '\0';
c->receiverId = random();
c->receiverId <<= 22;
c->receiverId ^= random();
c->receiverId <<= 22;
c->receiverId ^= random();
c->receiverId2 = 0;
c->receiverIdLocked = 0;
c->recent_rtt = -1;
c->remote = 1; // Messages will be marked remote by default
if ((c->fd == Modes.beast_fd) && (Modes.sdr_type == SDR_MODESBEAST || Modes.sdr_type == SDR_GNS)) {
/* Message from a local connected Modes-S beast or GNS5894 are passed off the internet */
c->remote = 0;
}
//fprintf(stderr, "c->receiverId: %016"PRIx64"\n", c->receiverId);
c->bufmax = MODES_NET_SNDBUF_SIZE << Modes.net_sndbuf_size;
if (service->sendqOverrideSize) {
c->bufmax = service->sendqOverrideSize;
}
c->buf = cmalloc(c->bufmax);
if (service->writer) {
c->sendq_max = MODES_NET_SNDBUF_SIZE << Modes.net_sndbuf_size;
if (service->sendqOverrideSize) {
c->sendq_max = service->sendqOverrideSize;
}
if (!(c->sendq = cmalloc(c->sendq_max))) {
fprintf(stderr, "Out of memory allocating client SendQ\n");
exit(1);
}
// Have to keep track of this manually
service->writer->lastReceiverId = 0; // make sure to resend receiverId
service->writer->connections++;
}
service->connections++;
Modes.modesClientCount++;
c->next = service->clients;
service->clients = c;
if (Modes.debug_net && service->connections % 50 == 0) {
fprintf(stderr, "%s connection count: %d\n", service->descr, service->connections);
}
if (service->writer && service->connections == 1) {
service->writer->lastWrite = now; // suppress heartbeat initially
}
epoll_data_t data;
data.ptr = c;
c->epollEvent.events = EPOLLIN | EPOLLRDHUP | EPOLLERR | EPOLLHUP;
c->epollEvent.data = data;
if (epoll_ctl(Modes.net_epfd, EPOLL_CTL_ADD, c->fd, &c->epollEvent))
perror("epoll_ctl fail:");
return c;
}
static int sendUUID(struct client *c, int64_t now) {
struct net_connector *con = c->con;
// sending UUID if hostname matches adsbexchange or for beast_reduce_plus output
char uuid[150];
uuid[0] = '\0';
if ((c->sendq && c->sendq_len + 256 < c->sendq_max) && con
&& (con->enable_uuid_ping || (strstr(con->address, "feed") && strstr(con->address, ".adsbexchange.com")) || Modes.debug_ping || Modes.debug_send_uuid)) {
int res = -1;
if (con->uuid) {
strncpy(uuid, con->uuid, 135);
res = strlen(uuid);
} else {
int fd = open(Modes.uuidFile, O_RDONLY);
// try legacy / adsbexchange image path as hardcoded fallback
if (fd == -1) {
fd = open("/boot/adsbx-uuid", O_RDONLY);
}
if (fd != -1) {
res = read(fd, uuid, 128);
close(fd);
}
}
if (res >= 28) {
if (uuid[res - 1] == '\n') {
// remove trailing newline
res--;
}
uuid[res] = '\0';
c->sendq[c->sendq_len++] = 0x1A;
c->sendq[c->sendq_len++] = 0xE4;
// uuid is padded with 'f', always send 36 chars
memset(c->sendq + c->sendq_len, 'f', 36);
strncpy(c->sendq + c->sendq_len, uuid, res);
c->sendq_len += 36;
} else {
uuid[0] = '\0';
fprintf(stderr, "ERROR: Not a valid UUID: %s\n", Modes.uuidFile);
fprintf(stderr, "Use this command to fix: sudo uuidgen > %s\n", Modes.uuidFile);
}
// enable ping stuff
// O for high resolution timer, both P and p already used for previous iterations
c->sendq[c->sendq_len++] = 0x1a;
c->sendq[c->sendq_len++] = 'W';
c->sendq[c->sendq_len++] = 'O';
return flushClient(c, now);
}
return -1;
}
static void checkServiceConnected(struct net_connector *con, int64_t now) {
if (!con->connecting) {
return;
}
//fprintf(stderr, "checkServiceConnected fd: %d\n", con->fd);
// delete dummyClient epollEvent for connection that is being established
epoll_ctl(Modes.net_epfd, EPOLL_CTL_DEL, con->fd, &con->dummyClient.epollEvent);
// we'll register new epollEvents in createSocketClient
// At this point, we need to check getsockopt() to see if we succeeded or failed...
int optval = -1;
socklen_t optlen = sizeof(optval);
if (getsockopt(con->fd, SOL_SOCKET, SO_ERROR, &optval, &optlen) == -1) {
fprintf(stderr, "getsockopt failed: %d (%s)\n", errno, strerror(errno));
// Bad stuff going on, but clear this anyway
con->connecting = 0;
anetCloseSocket(con->fd);
return;
}
if (optval != 0) {
// only 0 means "connection ok"
if (!con->silent_fail) {
fprintf(stderr, "%s: Connection to %s%s port %s failed: %d (%s)\n",
con->service->descr, con->address, con->resolved_addr, con->port, optval, strerror(optval));
}
con->connecting = 0;
anetCloseSocket(con->fd);
return;
}
// If we're able to create this "client", save the sockaddr info and print a msg
struct client *c;
c = createSocketClient(con->service, con->fd);
if (!c) {
con->connecting = 0;
fprintf(stderr, "createSocketClient failed on fd %d to %s%s port %s\n",
con->fd, con->address, con->resolved_addr, con->port);
anetCloseSocket(con->fd);
return;
}
strncpy(c->host, con->address, sizeof(c->host) - 1);
strncpy(c->port, con->port, sizeof(c->port) - 1);
setProxyString(c);
con->connecting = 0;
con->connected = 1;
con->lastConnect = now;
// link connection and client so we have access from one to the other
c->con = con;
con->c = c;
int uuid_sent = (sendUUID(c, now) == 0);
sendFiveHeartbeats(c, now);
if ((c->sendq && c->sendq_len + 256 < c->sendq_max)
&& strcmp(con->protocol, "gpsd_in") == 0) {
if (Modes.debug_gps) {
fprintTime(stderr, now);
fprintf(stderr, " gpsdebug: sending \'?WATCH={\"enable\":true,\"json\":true};\\n\'\n");
}
c->sendq_len += snprintf(c->sendq, 256, "?WATCH={\"enable\":true,\"json\":true};\n");
if (flushClient(c, now) < 0) {
return;
}
}
if (!Modes.interactive) {
if (uuid_sent) {
fprintf(stderr, "%s: Connection established: %s%s port %s (sent UUID)\n",
con->service->descr, con->address, con->resolved_addr, con->port);
} else {
fprintf(stderr, "%s: Connection established: %s%s port %s\n",
con->service->descr, con->address, con->resolved_addr, con->port);
}
}
}
// Initiate an outgoing connection.
static void serviceConnect(struct net_connector *con, int64_t now) {
int fd;
// make sure backoff is never too small
con->backoff = imax(Modes.net_connector_delay_min, con->backoff);
if (con->try_addr && con->try_addr->ai_next) {
// we have another address to try,
// iterate the address info linked list
con->try_addr = con->try_addr->ai_next;
} else {
// get the address info
if (!con->gai_request_in_progress) {
// launch a pthread for async getaddrinfo
con->try_addr = NULL;
if (con->addr_info) {
freeaddrinfo(con->addr_info);
con->addr_info = NULL;
}
con->gai_request_in_progress = 1;
con->gai_request_done = 0;
if (pthread_create(&con->thread, NULL, pthreadGetaddrinfo, con)) {
con->next_reconnect = now + Modes.net_connector_delay;
fprintf(stderr, "%s: pthread_create ERROR for %s port %s: %s\n", con->service->descr, con->address, con->port, strerror(errno));
return;
}
con->gai_request_in_progress = 1;
con->next_reconnect = now + 20;
return;
}
// gai request is in progress, let's check if it's done
pthread_mutex_lock(&con->mutex);
if (!con->gai_request_done) {
con->next_reconnect = now + 20;
pthread_mutex_unlock(&con->mutex);
return;
}
pthread_mutex_unlock(&con->mutex);
// gai request is done, join the thread that performed it
con->gai_request_in_progress = 0;
if (pthread_join(con->thread, NULL)) {
fprintf(stderr, "%s: pthread_join ERROR for %s port %s: %s\n", con->service->descr, con->address, con->port, strerror(errno));
con->next_reconnect = now + Modes.net_connector_delay;
return;
}
if (con->gai_error) {
if (!con->silent_fail) {
fprintf(stderr, "%s: Name resolution for %s failed: %s\n", con->service->descr, con->address, gai_strerror(con->gai_error));
}
// limit name resolution attempts via backoff
con->next_reconnect = now + con->backoff;
con->backoff = imin(Modes.net_connector_delay, 2 * con->backoff);
return;
}
// SUCCESS, we got the address info
// start with the first element of the linked list
con->try_addr = con->addr_info;
}
getnameinfo(con->try_addr->ai_addr, con->try_addr->ai_addrlen,
con->resolved_addr, sizeof(con->resolved_addr) - 3,
NULL, 0,
NI_NUMERICHOST | NI_NUMERICSERV);
if (strcmp(con->resolved_addr, con->address) == 0) {
con->resolved_addr[0] = '\0';
} else {
char tmp[sizeof(con->resolved_addr)+3]; // shut up gcc
snprintf(tmp, sizeof(tmp), " (%s)", con->resolved_addr);
memcpy(con->resolved_addr, tmp, sizeof(con->resolved_addr));
}
if (Modes.debug_net) {
//fprintf(stderr, "%s: Attempting connection to %s port %s ... (gonna set SNDBUF %d RCVBUF %d)\n", con->service->descr, con->address, con->port, getSNDBUF(con->service), getRCVBUF(con->service));
fprintf(stderr, "%s: Attempting connection to %s port %s ...\n", con->service->descr, con->address, con->port);
}
if (!con->try_addr->ai_next) {
// limit tcp connection attemtps via backoff
con->next_reconnect = now + con->backoff;
con->backoff = imin(Modes.net_connector_delay, 2 * con->backoff);
} else {
// quickly try all IPs associated with a name if there are multiple
con->next_reconnect = now + 20;
}
struct addrinfo *ai = con->try_addr;
fd = anetCreateSocket(Modes.aneterr, ai->ai_family, SOCK_NONBLOCK);
if (fd == ANET_ERR) {
fprintf(stderr, "%s: Connection to %s%s port %s failed: %s\n",
con->service->descr, con->address, con->resolved_addr, con->port, Modes.aneterr);
return;
}
con->fd = fd;
con->connecting = 1;
con->connect_timeout = now + imin(Modes.net_connector_delay, 5000); // really if your connection won't establish after 5 seconds ... tough luck.
//fprintf(stderr, "connect_timeout: %ld\n", (long) (con->connect_timeout - now));
if (anetTcpKeepAlive(Modes.aneterr, fd) != ANET_OK) {
fprintf(stderr, "%s: Unable to set keepalive: connection to %s port %s ...\n", con->service->descr, con->address, con->port);
}
// struct client for epoll purposes
struct client *c = &con->dummyClient;
c->service = con->service;
c->fd = con->fd;
c->net_connector_dummyClient = 1;
c->epollEvent.events = EPOLLIN | EPOLLOUT | EPOLLRDHUP | EPOLLERR | EPOLLHUP;
c->epollEvent.data.ptr = c;
c->con = con;
if (epoll_ctl(Modes.net_epfd, EPOLL_CTL_ADD, c->fd, &c->epollEvent)) {
perror("epoll_ctl fail:");
}
// explicitely setting tcp buffers causes failure of linux tcp window auto tuning ... it just doesn't work well without the auto tuning
if (0) {
setBuffers(fd, getSNDBUF(con->service), getRCVBUF(con->service));
}
if (connect(fd, ai->ai_addr, ai->ai_addrlen) < 0 && errno != EINPROGRESS) {
epoll_ctl(Modes.net_epfd, EPOLL_CTL_DEL, con->fd, &con->dummyClient.epollEvent);
con->connecting = 0;
anetCloseSocket(con->fd);
fprintf(stderr, "%s: Connection to %s%s port %s failed: %s\n",
con->service->descr, con->address, con->resolved_addr, con->port, strerror(errno));
}
}
// Timer callback checking periodically whether the push service lost its server
// connection and requires a re-connect.
static void serviceReconnectCallback(int64_t now) {
// Loop through the connectors, and
// - If it's not connected:
// - If it's "connecting", check to see if it timed out
// - Otherwise, if enough time has passed, try reconnecting
for (int i = 0; i < Modes.net_connectors_count; i++) {
struct net_connector *con = &Modes.net_connectors[i];
if (!con->connected) {
// If we've exceeded our connect timeout, close connection.
if (con->connecting && now >= con->connect_timeout) {
if (!con->silent_fail) {
fprintf(stderr, "%s: Connection to %s%s port %s timed out.\n",
con->service->descr, con->address, con->resolved_addr, con->port);
}
con->connecting = 0;
// delete dummyClient epollEvent for connection that is being established
epoll_ctl(Modes.net_epfd, EPOLL_CTL_DEL, con->fd, &con->dummyClient.epollEvent);
anetCloseSocket(con->fd);
}
if (!con->connecting && (con->next_reconnect <= now || Modes.synthetic_now)) {
serviceConnect(con, now);
}
} else {
// check for idle connection, this server version requires data
// or a heartbeat, otherwise it will force a reconnect
struct client *c = con->c;
if (Modes.net_heartbeat_interval && c
&& now - c->last_read > 2 * Modes.net_heartbeat_interval
&& c->service->heartbeat_in.msg != NULL
) {
fprintf(stderr, "%s: No data or heartbeat received for %.0f seconds, reconnecting: %s port %s\n",
c->service->descr, (2 * Modes.net_heartbeat_interval) / 1000.0, c->host, c->port);
modesCloseClient(c);
}
}
}
}
// Set up the given service to listen on an address/port.
// _exits_ on failure!
void serviceListen(struct net_service *service, char *bind_addr, char *bind_ports, int epfd) {
int *fds = NULL;
int n = 0;
char *p, *end;
char buf[128];
if (service->listener_count > 0) {
fprintf(stderr, "Tried to set up the service %s twice!\n", service->descr);
exit(1);
}
if (!bind_ports || !strcmp(bind_ports, "") || !strcmp(bind_ports, "0"))
return;
if (0 && Modes.debug_net) {
fprintf(stderr, "serviceListen: %s with SNDBUF %d RCVBUF %d)\n", service->descr, getSNDBUF(service), getRCVBUF(service));
}
p = bind_ports;
while (p && *p) {
int newfds[16];
int nfds, i;
int is_unix = 0;
if (strncmp(p, "unix:", 5) == 0) {
is_unix = 1;
p += 5;
}
end = strpbrk(p, ", ");
if (!end) {
strncpy(buf, p, sizeof (buf) - 1);
buf[sizeof (buf) - 1] = 0;
p = NULL;
} else {
size_t len = end - p;
if (len >= sizeof (buf))
len = sizeof (buf) - 1;
memcpy(buf, p, len);
buf[len] = 0;
p = end + 1;
}
if (is_unix) {
if (service->unixSocket) {
fprintf(stderr, "Multiple unix sockets per service are not supported! %s (%s): %s\n",
buf, service->descr, Modes.aneterr);
exit(1);
}
sfree(service->unixSocket);
service->unixSocket = strdup(buf);
unlink(service->unixSocket);
int fd = anetUnixSocket(Modes.aneterr, buf, SOCK_NONBLOCK);
if (fd == ANET_ERR) {
fprintf(stderr, "Error opening the listening port %s (%s): %s\n",
buf, service->descr, Modes.aneterr);
exit(1);
}
if (chmod(service->unixSocket, 0666) != 0) {
perror("serviceListen: couldn't set permissions for unix socket due to:");
}
newfds[0] = fd;
nfds = 1;
} else {
//nfds = anetTcpServer(Modes.aneterr, buf, bind_addr, newfds, sizeof (newfds), SOCK_NONBLOCK, getSNDBUF(service), getRCVBUF(service));
// explicitely setting tcp buffers causes failure of linux tcp window auto tuning ... it just doesn't work well without the auto tuning
nfds = anetTcpServer(Modes.aneterr, buf, bind_addr, newfds, sizeof (newfds), SOCK_NONBLOCK, -1, -1);
if (nfds == ANET_ERR) {
fprintf(stderr, "Error opening the listening port %s (%s): %s\n",
buf, service->descr, Modes.aneterr);
exit(1);
}
}
static int listenerCount;
listenerCount++;
char listenString[1024];
snprintf(listenString, 1023, "%5s: %s port", buf, service->descr);
fprintf(stderr, "%-38s\n", listenString);
fds = realloc(fds, (n + nfds) * sizeof (int));
if (!fds) {
fprintf(stderr, "out of memory\n");
exit(1);
}
for (i = 0; i < nfds; ++i) {
fds[n++] = newfds[i];
}
}
service->listener_count = n;
service->listener_fds = fds;
if (epfd >= 0) {
service->listenSockets = cmalloc(service->listener_count * sizeof(struct client));
memset(service->listenSockets, 0, service->listener_count * sizeof(struct client));
for (int i = 0; i < service->listener_count; ++i) {
// struct client for epoll purposes for each listen socket.
struct client *c = &service->listenSockets[i];
c->service = service;
c->fd = service->listener_fds[i];
c->acceptSocket = 1;
c->epollEvent.events = EPOLLIN | EPOLLRDHUP | EPOLLERR | EPOLLHUP;
c->epollEvent.data.ptr = c;
if (epoll_ctl(epfd, EPOLL_CTL_ADD, c->fd, &c->epollEvent))
perror("epoll_ctl fail:");
}
}
}
static void initMessageBuffers() {
if (Modes.decodeThreads > 1) {
pthread_mutex_init(&Modes.decodeLock, NULL);
pthread_mutex_init(&Modes.trackLock, NULL);
pthread_mutex_init(&Modes.outputLock, NULL);
Modes.decodeTasks = allocate_task_group(Modes.decodeThreads);
Modes.decodePool = threadpool_create(Modes.decodeThreads, 0);
}
Modes.netMessageBuffer = cmalloc(Modes.decodeThreads * sizeof(struct messageBuffer));
memset(Modes.netMessageBuffer, 0x0, Modes.decodeThreads * sizeof(struct messageBuffer));
for (int k = 0; k < Modes.decodeThreads; k++) {
struct messageBuffer *buf = &Modes.netMessageBuffer[k];
buf->alloc = 128 * imin(3, Modes.net_sndbuf_size);
buf->len = 0;
buf->id = k;
buf->activeClient = NULL;
int bytes = buf->alloc * sizeof(struct modesMessage);
buf->msg = cmalloc(bytes);
//fprintf(stderr, "netMessageBuffer alloc: %d size: %d\n", buf->alloc, bytes);
}
}
void modesInitNet(void) {
initMessageBuffers();
uat2esnt_initCrcTables();
if (0) {
char *msg[4] = { "-00a974f135362f522fc408c9122e1b015900;",
"-08a78bea35705f5283880459010227605809e00d40a2040be2a5c2a00004a0000000;rs=2;",
"-10ad7233358a9d528bc40aa900be3120880000000000000000000000000b10000000;rs=4;",
"-10a78bea3570b152830c0449010626e04800000000000000000000000004a0000000;rs=2;" };
for (int i = 0; i < 4; i++) {
char output[2048];
uat2esnt_convert_message(msg[i], msg[i] + strlen(msg[i]), output, output + sizeof(output));
fprintf(stderr, "%s\n", output);
}
exit(1);
}
Modes.net_connector_delay_min = imax(50, Modes.net_connector_delay / 64);
Modes.last_connector_fail = Modes.next_reconnect_callback = mstime();
if (!Modes.net)
return;
struct net_service *beast_out;
struct net_service *beast_reduce_out;
struct net_service *garbage_out;
struct net_service *raw_out;
struct net_service *raw_in;
struct net_service *vrs_out;
struct net_service *json_out;
struct net_service *feedmap_out;
struct net_service *sbs_out;
struct net_service *sbs_out_replay;
struct net_service *sbs_out_mlat;
struct net_service *sbs_out_jaero;
struct net_service *sbs_out_prio;
struct net_service *asterix_out;
struct net_service *asterix_in;
struct net_service *sbs_in;
struct net_service *sbs_in_mlat;
struct net_service *sbs_in_jaero;
struct net_service *sbs_in_prio;
struct net_service *gpsd_in;
struct net_service *planefinder_in;
signal(SIGPIPE, SIG_IGN);
Modes.net_epfd = my_epoll_create(&Modes.exitNowEventfd);
// set up listeners
raw_out = serviceInit(&Modes.services_out, "Raw TCP output", &Modes.raw_out, raw_heartbeat, no_heartbeat, READ_MODE_IGNORE, NULL, NULL);
serviceListen(raw_out, Modes.net_bind_address, Modes.net_output_raw_ports, Modes.net_epfd);
beast_out = serviceInit(&Modes.services_out, "Beast TCP output", &Modes.beast_out, beast_heartbeat, no_heartbeat, READ_MODE_BEAST_COMMAND, NULL, handleBeastCommand);
serviceListen(beast_out, Modes.net_bind_address, Modes.net_output_beast_ports, Modes.net_epfd);
beast_reduce_out = serviceInit(&Modes.services_out, "BeastReduce TCP output", &Modes.beast_reduce_out, beast_heartbeat, no_heartbeat, READ_MODE_BEAST_COMMAND, NULL, handleBeastCommand);
serviceListen(beast_reduce_out, Modes.net_bind_address, Modes.net_output_beast_reduce_ports, Modes.net_epfd);
garbage_out = serviceInit(&Modes.services_out, "Garbage TCP output", &Modes.garbage_out, beast_heartbeat, no_heartbeat, READ_MODE_IGNORE, NULL, NULL);
serviceListen(garbage_out, Modes.net_bind_address, Modes.garbage_ports, Modes.net_epfd);
vrs_out = serviceInit(&Modes.services_out, "VRS json output", &Modes.vrs_out, no_heartbeat, no_heartbeat, READ_MODE_IGNORE, NULL, NULL);
serviceListen(vrs_out, Modes.net_bind_address, Modes.net_output_vrs_ports, Modes.net_epfd);
json_out = serviceInit(&Modes.services_out, "Position json output", &Modes.json_out, no_heartbeat, no_heartbeat, READ_MODE_IGNORE, NULL, NULL);
serviceListen(json_out, Modes.net_bind_address, Modes.net_output_json_ports, Modes.net_epfd);
feedmap_out = serviceInit(&Modes.services_out, "Forward feed map data", &Modes.feedmap_out, no_heartbeat, no_heartbeat, READ_MODE_IGNORE, NULL, NULL);
sbs_out = serviceInit(&Modes.services_out, "SBS TCP output ALL", &Modes.sbs_out, sbs_heartbeat, no_heartbeat, READ_MODE_IGNORE, NULL, NULL);
serviceListen(sbs_out, Modes.net_bind_address, Modes.net_output_sbs_ports, Modes.net_epfd);
sbs_out_replay = serviceInit(&Modes.services_out, "SBS TCP output MAIN", &Modes.sbs_out_replay, sbs_heartbeat, no_heartbeat, READ_MODE_IGNORE, NULL, NULL);
sbs_out_prio = serviceInit(&Modes.services_out, "SBS TCP output PRIO", &Modes.sbs_out_prio, sbs_heartbeat, no_heartbeat, READ_MODE_IGNORE, NULL, NULL);
sbs_out_mlat = serviceInit(&Modes.services_out, "SBS TCP output MLAT", &Modes.sbs_out_mlat, sbs_heartbeat, no_heartbeat, READ_MODE_IGNORE, NULL, NULL);
sbs_out_jaero = serviceInit(&Modes.services_out, "SBS TCP output JAERO", &Modes.sbs_out_jaero, sbs_heartbeat, no_heartbeat, READ_MODE_IGNORE, NULL, NULL);
serviceListen(sbs_out_jaero, Modes.net_bind_address, Modes.net_output_jaero_ports, Modes.net_epfd);
int sbs_port_len = strlen(Modes.net_output_sbs_ports);
int pos = sbs_port_len - 1;
if (sbs_port_len <= 5 && Modes.net_output_sbs_ports[pos] == '5') {
char *replay = strdup(Modes.net_output_sbs_ports);
replay[pos] = '6';
serviceListen(sbs_out_replay, Modes.net_bind_address, replay, Modes.net_epfd);
char *mlat = strdup(Modes.net_output_sbs_ports);
mlat[pos] = '7';
serviceListen(sbs_out_mlat, Modes.net_bind_address, mlat, Modes.net_epfd);
char *prio = strdup(Modes.net_output_sbs_ports);
prio[pos] = '8';
serviceListen(sbs_out_prio, Modes.net_bind_address, prio, Modes.net_epfd);
char *jaero = strdup(Modes.net_output_sbs_ports);
jaero[pos] = '9';
if (sbs_out_jaero->listener_count == 0)
serviceListen(sbs_out_jaero, Modes.net_bind_address, jaero, Modes.net_epfd);
sfree(replay);
sfree(mlat);
sfree(prio);
sfree(jaero);
}
sbs_in = serviceInit(&Modes.services_in, "SBS TCP input MAIN", NULL, no_heartbeat, sbs_heartbeat, READ_MODE_ASCII, "\n", decodeSbsLine);
serviceListen(sbs_in, Modes.net_bind_address, Modes.net_input_sbs_ports, Modes.net_epfd);
sbs_in_mlat = serviceInit(&Modes.services_in, "SBS TCP input MLAT", NULL, no_heartbeat, sbs_heartbeat, READ_MODE_ASCII, "\n", decodeSbsLineMlat);
sbs_in_prio = serviceInit(&Modes.services_in, "SBS TCP input PRIO", NULL, no_heartbeat, sbs_heartbeat, READ_MODE_ASCII, "\n", decodeSbsLinePrio);
sbs_in_jaero = serviceInit(&Modes.services_in, "SBS TCP input JAERO", NULL, no_heartbeat, sbs_heartbeat, READ_MODE_ASCII, "\n", decodeSbsLineJaero);
serviceListen(sbs_in_jaero, Modes.net_bind_address, Modes.net_input_jaero_ports, Modes.net_epfd);
sbs_port_len = strlen(Modes.net_input_sbs_ports);
pos = sbs_port_len - 1;
if (sbs_port_len <= 5 && Modes.net_input_sbs_ports[pos] == '6') {
char *mlat = strdup(Modes.net_input_sbs_ports);
mlat[pos] = '7';
serviceListen(sbs_in_mlat, Modes.net_bind_address, mlat, Modes.net_epfd);
char *prio = strdup(Modes.net_input_sbs_ports);
prio[pos] = '8';
serviceListen(sbs_in_prio, Modes.net_bind_address, prio, Modes.net_epfd);
char *jaero = strdup(Modes.net_input_sbs_ports);
jaero[pos] = '9';
if (sbs_in_jaero->listener_count == 0)
serviceListen(sbs_in_jaero, Modes.net_bind_address, jaero, Modes.net_epfd);
sfree(mlat);
sfree(prio);
sfree(jaero);
}
asterix_out = serviceInit(&Modes.services_out, "ASTERIX output", &Modes.asterix_out, no_heartbeat, no_heartbeat, READ_MODE_IGNORE, NULL, NULL);
serviceListen(asterix_out, Modes.net_bind_address, Modes.net_output_asterix_ports, Modes.net_epfd);
asterix_in = serviceInit(&Modes.services_in, "ASTERIX TCP input", NULL, no_heartbeat, no_heartbeat, READ_MODE_ASTERIX, NULL, decodeAsterixMessage);
serviceListen(asterix_in, Modes.net_bind_address, Modes.net_input_asterix_ports, Modes.net_epfd);
gpsd_in = serviceInit(&Modes.services_in, "GPSD TCP input", &Modes.gpsd_in, no_heartbeat, no_heartbeat, READ_MODE_ASCII, "\n", handle_gpsd);
if (Modes.json_dir && Modes.json_globe_index && Modes.globe_history_dir) {
/* command input */
struct net_service *commandService = serviceInit(&Modes.services_in, "command input", NULL, no_heartbeat, no_heartbeat, READ_MODE_ASCII, "\n", handleCommandSocket);
char commandSocketFile[PATH_MAX];
char commandSocket[PATH_MAX];
snprintf(commandSocketFile, PATH_MAX, "%s/cmd.sock", Modes.json_dir);
unlink(commandSocketFile);
snprintf(commandSocket, PATH_MAX, "unix:%s/cmd.sock", Modes.json_dir);
serviceListen(commandService, Modes.net_bind_address, commandSocket, Modes.net_epfd);
chmod(commandSocket, 0600);
}
raw_in = serviceInit(&Modes.services_in, "Raw TCP input", NULL, no_heartbeat, raw_heartbeat, READ_MODE_ASCII, "\n", processHexMessage);
serviceListen(raw_in, Modes.net_bind_address, Modes.net_input_raw_ports, Modes.net_epfd);
/* Beast input via network */
Modes.beast_in_service = serviceInit(&Modes.services_in, "Beast TCP input", &Modes.beast_in, no_heartbeat, beast_heartbeat, READ_MODE_BEAST, NULL, decodeBinMessage);
if (Modes.netIngest) {
Modes.beast_in_service->sendqOverrideSize = MODES_NET_SNDBUF_SIZE;
Modes.beast_in_service->recvqOverrideSize = MODES_NET_SNDBUF_SIZE;
// --net-buffer won't increase receive buffer for ingest server to avoid running out of memory using lots of connections
}
serviceListen(Modes.beast_in_service, Modes.net_bind_address, Modes.net_input_beast_ports, Modes.net_epfd);
/* Beast input from local Modes-S Beast via USB */
if (Modes.sdr_type == SDR_MODESBEAST || Modes.sdr_type == SDR_GNS) {
Modes.serial_client = createSocketClient(Modes.beast_in_service, Modes.beast_fd);
}
/* Planefinder input via network */
planefinder_in = serviceInit(&Modes.services_in, "Planefinder TCP input", NULL, no_heartbeat, no_heartbeat, READ_MODE_PLANEFINDER, NULL, decodePfMessage);
serviceListen(planefinder_in, Modes.net_bind_address, Modes.net_input_planefinder_ports, Modes.net_epfd);
Modes.uat_in_service = serviceInit(&Modes.services_in, "UAT TCP input", NULL, no_heartbeat, no_heartbeat, READ_MODE_ASCII, "\n", decodeUatMessage);
// for testing ... don't care to create an argument to open this port