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igate.c
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//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
// Copyright (C) 2013, 2014, 2015 John Langner, WB2OSZ
//
// 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, see <http://www.gnu.org/licenses/>.
//
/*------------------------------------------------------------------
*
* Module: igate.c
*
* Purpose: IGate client.
*
* Description: Establish connection with a tier 2 IGate server
* and relay packets between RF and Internet.
*
* References: APRS-IS (Automatic Packet Reporting System-Internet Service)
* http://www.aprs-is.net/Default.aspx
*
* APRS iGate properties
* http://wiki.ham.fi/APRS_iGate_properties
*
*---------------------------------------------------------------*/
/*------------------------------------------------------------------
*
* From http://windows.microsoft.com/en-us/windows7/ipv6-frequently-asked-questions
*
* How can I enable IPv6?
* Follow these steps:
*
* Open Network Connections by clicking the Start button, and then clicking
* Control Panel. In the search box, type adapter, and then, under Network
* and Sharing Center, click View network connections.
*
* Right-click your network connection, and then click Properties.
* If you're prompted for an administrator password or confirmation, type
* the password or provide confirmation.
*
* Select the check box next to Internet Protocol Version 6 (TCP/IPv6).
*
*---------------------------------------------------------------*/
/*
* Native Windows: Use the Winsock interface.
* Linux: Use the BSD socket interface.
* Cygwin: Can use either one.
*/
#if __WIN32__
/* The goal is to support Windows XP and later. */
#include <winsock2.h>
// default is 0x0400
#undef _WIN32_WINNT
#define _WIN32_WINNT 0x0501 /* Minimum OS version is XP. */
//#define _WIN32_WINNT 0x0502 /* Minimum OS version is XP with SP2. */
//#define _WIN32_WINNT 0x0600 /* Minimum OS version is Vista. */
#include <ws2tcpip.h>
#else
#include <stdlib.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#endif
#include <unistd.h>
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <time.h>
#include "direwolf.h"
#include "ax25_pad.h"
#include "textcolor.h"
#include "version.h"
#include "digipeater.h"
#include "tq.h"
#include "igate.h"
#include "latlong.h"
#include "pfilter.h"
#if __WIN32__
static unsigned __stdcall connnect_thread (void *arg);
static unsigned __stdcall igate_recv_thread (void *arg);
#else
static void * connnect_thread (void *arg);
static void * igate_recv_thread (void *arg);
#endif
static void send_msg_to_server (const char *msg);
static void xmit_packet (char *message, int chan);
static void rx_to_ig_init (void);
static void rx_to_ig_remember (packet_t pp);
static int rx_to_ig_allow (packet_t pp);
static void ig_to_tx_init (void);
static int ig_to_tx_allow (packet_t pp, int chan);
/*
* File descriptor for socket to IGate server.
* Set to -1 if not connected.
* (Don't use SOCKET type because it is unsigned.)
*/
static volatile int igate_sock = -1;
/*
* After connecting to server, we want to make sure
* that the login sequence is sent first.
* This is set to true after the login is complete.
*/
static volatile int ok_to_send = 0;
/*
* Convert Internet address to text.
* Can't use InetNtop because it is supported only on Windows Vista and later.
*/
static char * ia_to_text (int Family, void * pAddr, char * pStringBuf, size_t StringBufSize)
{
struct sockaddr_in *sa4;
struct sockaddr_in6 *sa6;
switch (Family) {
case AF_INET:
sa4 = (struct sockaddr_in *)pAddr;
#if __WIN32__
snprintf (pStringBuf, StringBufSize, "%d.%d.%d.%d", sa4->sin_addr.S_un.S_un_b.s_b1,
sa4->sin_addr.S_un.S_un_b.s_b2,
sa4->sin_addr.S_un.S_un_b.s_b3,
sa4->sin_addr.S_un.S_un_b.s_b4);
#else
inet_ntop (AF_INET, &(sa4->sin_addr), pStringBuf, StringBufSize);
#endif
break;
case AF_INET6:
sa6 = (struct sockaddr_in6 *)pAddr;
#if __WIN32__
snprintf (pStringBuf, StringBufSize, "%x:%x:%x:%x:%x:%x:%x:%x",
ntohs(((unsigned short *)(&(sa6->sin6_addr)))[0]),
ntohs(((unsigned short *)(&(sa6->sin6_addr)))[1]),
ntohs(((unsigned short *)(&(sa6->sin6_addr)))[2]),
ntohs(((unsigned short *)(&(sa6->sin6_addr)))[3]),
ntohs(((unsigned short *)(&(sa6->sin6_addr)))[4]),
ntohs(((unsigned short *)(&(sa6->sin6_addr)))[5]),
ntohs(((unsigned short *)(&(sa6->sin6_addr)))[6]),
ntohs(((unsigned short *)(&(sa6->sin6_addr)))[7]));
#else
inet_ntop (AF_INET6, &(sa6->sin6_addr), pStringBuf, StringBufSize);
#endif
break;
default:
snprintf (pStringBuf, StringBufSize, "Invalid address family!");
}
//assert (strlen(pStringBuf) < StringBufSize);
return pStringBuf;
}
#if ITEST
/* For unit testing. */
int main (int argc, char *argv[])
{
struct audio_s audio_config;
struct igate_config_s igate_config;
struct digi_config_s digi_config;
packet_t pp;
memset (&audio_config, 0, sizeof(audio_config));
audio_config.adev[0].num_chans = 2;
strlcpy (audio_config.achan[0].mycall, "WB2OSZ-1", sizeof(audio_config.achan[0].mycall));
strlcpy (audio_config.achan[1].mycall, "WB2OSZ-2", sizeof(audio_config.achan[0].mycall));
memset (&igate_config, 0, sizeof(igate_config));
strlcpy (igate_config.t2_server_name, "localhost", sizeof(igate_config.t2_server_name));
igate_config.t2_server_port = 14580;
strlcpy (igate_config.t2_login, "WB2OSZ-JL", sizeof(igate_config.t2_login));
strlcpy (igate_config.t2_passcode, "-1", sizeof(igate_config.t2_passcode));
igate_config.t2_filter = strdup ("r/1/2/3");
igate_config.tx_chan = 0;
strlcpy (igate_config.tx_via, ",WIDE2-1", sizeof(igate_config.tx_via));
igate_config.tx_limit_1 = 3;
igate_config.tx_limit_5 = 5;
memset (&digi_config, 0, sizeof(digi_config));
igate_init(&igate_config, &digi_config);
while (igate_sock == -1) {
SLEEP_SEC(1);
}
SLEEP_SEC (2);
pp = ax25_from_text ("A>B,C,D:Ztest message 1", 0);
igate_send_rec_packet (0, pp);
ax25_delete (pp);
SLEEP_SEC (2);
pp = ax25_from_text ("A>B,C,D:Ztest message 2", 0);
igate_send_rec_packet (0, pp);
ax25_delete (pp);
SLEEP_SEC (2);
pp = ax25_from_text ("A>B,C,D:Ztest message 2", 0); /* Should suppress duplicate. */
igate_send_rec_packet (0, pp);
ax25_delete (pp);
SLEEP_SEC (2);
pp = ax25_from_text ("A>B,TCPIP,D:ZShould drop this due to path", 0);
igate_send_rec_packet (0, pp);
ax25_delete (pp);
SLEEP_SEC (2);
pp = ax25_from_text ("A>B,C,D:?Should drop query", 0);
igate_send_rec_packet (0, pp);
ax25_delete (pp);
SLEEP_SEC (5);
pp = ax25_from_text ("A>B,C,D:}E>F,G*,H:Zthird party stuff", 0);
igate_send_rec_packet (0, pp);
ax25_delete (pp);
#if 1
while (1) {
SLEEP_SEC (20);
text_color_set(DW_COLOR_INFO);
dw_printf ("Send received packet\n");
send_msg_to_server ("W1ABC>APRS:?");
}
#endif
return 0;
}
#endif
/*
* Global stuff (to this file)
*
* These are set by init function and need to
* be kept around in case connection is lost and
* we need to reestablish the connection later.
*/
static struct audio_s *save_audio_config_p;
static struct igate_config_s *save_igate_config_p;
static struct digi_config_s *save_digi_config_p;
static int s_debug;
/*
* Statistics.
* TODO: need print function.
*/
static int stats_failed_connect; /* Number of times we tried to connect to */
/* a server and failed. A small number is not */
/* a bad thing. Each name should have a bunch */
/* of addresses for load balancing and */
/* redundancy. */
static int stats_connects; /* Number of successful connects to a server. */
/* Normally you'd expect this to be 1. */
/* Could be larger if one disappears and we */
/* try again to find a different one. */
static time_t stats_connect_at; /* Most recent time connection was established. */
/* can be used to determine elapsed connect time. */
static int stats_rf_recv_packets; /* Number of candidate packets from the radio. */
static int stats_rx_igate_packets; /* Number of packets passed along to the IGate */
/* server after filtering. */
static int stats_uplink_bytes; /* Total number of bytes sent to IGate server */
/* including login, packets, and hearbeats. */
static int stats_downlink_bytes; /* Total number of bytes from IGate server including */
/* packets, heartbeats, other messages. */
static int stats_tx_igate_packets; /* Number of packets from IGate server. */
static int stats_rf_xmit_packets; /* Number of packets passed along to radio */
/* after rate limiting or other restrictions. */
/* We have some statistics. What do we do with them?
IGate stations often send packets like this:
<IGATE MSG_CNT=1238 LOC_CNT=0 FILL_CNT=0
<IGATE,MSG_CNT=1,LOC_CNT=25
<IGATE,MSG_CNT=0,LOC_CNT=46,DIR_CNT=13,RF_CNT=49,RFPORT_ID=0
What does it all mean?
Why do some have spaces instead of commas between the capabilities?
The APRS Protocol Reference ( http://www.aprs.org/doc/APRS101.PDF ),
section 15, briefly discusses station capabilities and gives the example
IGATE,MSG_CNT=n,LOC_CNT=n
IGate Design ( http://www.aprs-is.net/IGating.aspx ) barely mentions
<IGATE,MSG_CNT=n,LOC_CNT=n
This leaves many questions. Does "number of messages transmitted" mean only
the APRS "Message" (data type indicator ":") or does it mean any type of
APRS packet? What are "local" stations? Those we hear directly without
going thru a digipeater?
What are DIR_CNT, RF_CNT, and so on?
Are the counts since the system started up or are they for some interval?
*/
/*-------------------------------------------------------------------
*
* Name: igate_init
*
* Purpose: One time initialization when main application starts up.
*
* Inputs: p_audio_config - Audio channel configuration. All we care about is:
* - Number of radio channels.
* - Radio call and SSID for each channel.
*
* p_igate_config - IGate configuration.
*
* p_digi_config - Digipeater configuration.
* All we care about here is the packet filtering options.
*
* debug_level - 0 print packets FROM APRS-IS,
* establishing connection with sergver, and
* and anything rejected by client side filtering.
* 1 plus packets sent TO server or why not.
* 2 plus duplicate detection overview.
* 3 plus duplicate detection details.
*
* Description: This starts two threads:
*
* * to establish and maintain a connection to the server.
* * to listen for packets from the server.
*
*--------------------------------------------------------------------*/
void igate_init (struct audio_s *p_audio_config, struct igate_config_s *p_igate_config, struct digi_config_s *p_digi_config, int debug_level)
{
#if __WIN32__
HANDLE connnect_th;
HANDLE cmd_recv_th;
#else
pthread_t connect_listen_tid;
pthread_t cmd_listen_tid;
int e;
#endif
s_debug = debug_level;
#if DEBUGx
text_color_set(DW_COLOR_DEBUG);
dw_printf ("igate_init ( %s, %d, %s, %s, %s )\n",
p_igate_config->t2_server_name,
p_igate_config->t2_server_port,
p_igate_config->t2_login,
p_igate_config->t2_passcode,
p_igate_config->t2_filter);
#endif
/*
* Save the arguments for later use.
*/
save_audio_config_p = p_audio_config;
save_igate_config_p = p_igate_config;
save_digi_config_p = p_digi_config;
stats_failed_connect = 0;
stats_connects = 0;
stats_connect_at = 0;
stats_rf_recv_packets = 0;
stats_rx_igate_packets = 0;
stats_uplink_bytes = 0;
stats_downlink_bytes = 0;
stats_tx_igate_packets = 0;
stats_rf_xmit_packets = 0;
rx_to_ig_init ();
ig_to_tx_init ();
/*
* Continue only if we have server name, login, and passcode.
*/
if (strlen(p_igate_config->t2_server_name) == 0 ||
strlen(p_igate_config->t2_login) == 0 ||
strlen(p_igate_config->t2_passcode) == 0) {
return;
}
/*
* This connects to the server and sets igate_sock.
* It also sends periodic messages to say I'm still alive.
*/
#if __WIN32__
connnect_th = (HANDLE)_beginthreadex (NULL, 0, connnect_thread, (void *)NULL, 0, NULL);
if (connnect_th == NULL) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Internal error: Could not create IGate connection thread\n");
return;
}
#else
e = pthread_create (&connect_listen_tid, NULL, connnect_thread, (void *)NULL);
if (e != 0) {
text_color_set(DW_COLOR_ERROR);
perror("Internal error: Could not create IGate connection thread");
return;
}
#endif
/*
* This reads messages from client when igate_sock is valid.
*/
#if __WIN32__
cmd_recv_th = (HANDLE)_beginthreadex (NULL, 0, igate_recv_thread, NULL, 0, NULL);
if (cmd_recv_th == NULL) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Internal error: Could not create IGate reading thread\n");
return;
}
#else
e = pthread_create (&cmd_listen_tid, NULL, igate_recv_thread, NULL);
if (e != 0) {
text_color_set(DW_COLOR_ERROR);
perror("Internal error: Could not create IGate reading thread");
return;
}
#endif
}
/*-------------------------------------------------------------------
*
* Name: connnect_thread
*
* Purpose: Establish connection with IGate server.
* Send periodic heartbeat to keep keep connection active.
* Reconnect if something goes wrong and we got disconnected.
*
* Inputs: arg - Not used.
*
* Outputs: igate_sock - File descriptor for communicating with client app.
* Will be -1 if not connected.
*
* References: TCP client example.
* http://msdn.microsoft.com/en-us/library/windows/desktop/ms737591(v=vs.85).aspx
*
* Linux IPv6 HOWTO
* http://www.tldp.org/HOWTO/Linux+IPv6-HOWTO/
*
*--------------------------------------------------------------------*/
/*
* Addresses don't get mixed up very well.
* IPv6 always shows up last so we'd probably never
* end up using any of them. Use our own shuffle.
*/
static void shuffle (struct addrinfo *host[], int nhosts)
{
int j, k;
assert (RAND_MAX >= nhosts); /* for % to work right */
if (nhosts < 2) return;
srand (time(NULL));
for (j=0; j<nhosts; j++) {
k = rand() % nhosts;
assert (k >=0 && k<nhosts);
if (j != k) {
struct addrinfo *temp;
temp = host[j]; host[j] = host[k]; host[k] = temp;
}
}
}
#define MAX_HOSTS 50
#if __WIN32__
static unsigned __stdcall connnect_thread (void *arg)
#else
static void * connnect_thread (void *arg)
#endif
{
struct addrinfo hints;
struct addrinfo *ai_head = NULL;
struct addrinfo *ai;
struct addrinfo *hosts[MAX_HOSTS];
int num_hosts, n;
int err;
char server_port_str[12]; /* text form of port number */
char ipaddr_str[46]; /* text form of IP address */
#if __WIN32__
WSADATA wsadata;
#endif
snprintf (server_port_str, sizeof(server_port_str), "%d", save_igate_config_p->t2_server_port);
#if DEBUGx
text_color_set(DW_COLOR_DEBUG);
dw_printf ("DEBUG: igate connect_thread start, port = %d = '%s'\n", save_igate_config_p->t2_server_port, server_port_str);
#endif
#if __WIN32__
err = WSAStartup (MAKEWORD(2,2), &wsadata);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf("WSAStartup failed: %d\n", err);
return (0);
}
if (LOBYTE(wsadata.wVersion) != 2 || HIBYTE(wsadata.wVersion) != 2) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Could not find a usable version of Winsock.dll\n");
WSACleanup();
//sleep (1);
return (0);
}
#endif
memset (&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC; /* Allow either IPv4 or IPv6. */
// IPv6 is half baked on Windows XP.
// We might need to leave out IPv6 support for Windows version.
// hints.ai_family = AF_INET; /* IPv4 only. */
#if IPV6_ONLY
/* IPv6 addresses always show up at end of list. */
/* Force use of them for testing. */
hints.ai_family = AF_INET6; /* IPv6 only */
#endif
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
/*
* Repeat forever.
*/
while (1) {
/*
* Connect to IGate server if not currently connected.
*/
if (igate_sock == -1) {
SLEEP_SEC (5);
ai_head = NULL;
err = getaddrinfo(save_igate_config_p->t2_server_name, server_port_str, &hints, &ai_head);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
#if __WIN32__
dw_printf ("Can't get address for IGate server %s, err=%d\n",
save_igate_config_p->t2_server_name, WSAGetLastError());
#else
dw_printf ("Can't get address for IGate server %s, %s\n",
save_igate_config_p->t2_server_name, gai_strerror(err));
#endif
freeaddrinfo(ai_head);
continue;
}
#if DEBUG_DNS
text_color_set(DW_COLOR_DEBUG);
dw_printf ("getaddrinfo returns:\n");
#endif
num_hosts = 0;
for (ai = ai_head; ai != NULL; ai = ai->ai_next) {
#if DEBUG_DNS
text_color_set(DW_COLOR_DEBUG);
ia_to_text (ai->ai_family, ai->ai_addr, ipaddr_str, sizeof(ipaddr_str));
dw_printf (" %s\n", ipaddr_str);
#endif
hosts[num_hosts] = ai;
if (num_hosts < MAX_HOSTS) num_hosts++;
}
// We can get multiple addresses back for the host name.
// These should be somewhat randomized for load balancing.
// It turns out the IPv6 addresses are always at the
// end for both Windows and Linux. We do our own shuffling
// to mix them up better and give IPv6 a chance.
shuffle (hosts, num_hosts);
#if DEBUG_DNS
text_color_set(DW_COLOR_DEBUG);
dw_printf ("after shuffling:\n");
for (n=0; n<num_hosts; n++) {
ia_to_text (hosts[n]->ai_family, hosts[n]->ai_addr, ipaddr_str, sizeof(ipaddr_str));
dw_printf (" %s\n", ipaddr_str);
}
#endif
// Try each address until we find one that is successful.
for (n=0; n<num_hosts; n++) {
int is;
ai = hosts[n];
ia_to_text (ai->ai_family, ai->ai_addr, ipaddr_str, sizeof(ipaddr_str));
is = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
#if __WIN32__
if (is == INVALID_SOCKET) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("IGate: Socket creation failed, err=%d", WSAGetLastError());
WSACleanup();
is = -1;
stats_failed_connect++;
continue;
}
#else
if (err != 0) {
text_color_set(DW_COLOR_INFO);
dw_printf("Connect to IGate server %s (%s) failed.\n\n",
save_igate_config_p->t2_server_name, ipaddr_str);
(void) close (is);
is = -1;
stats_failed_connect++;
continue;
}
#endif
#ifndef DEBUG_DNS
err = connect(is, ai->ai_addr, (int)ai->ai_addrlen);
#if __WIN32__
if (err == SOCKET_ERROR) {
text_color_set(DW_COLOR_INFO);
dw_printf("Connect to IGate server %s (%s) failed.\n\n",
save_igate_config_p->t2_server_name, ipaddr_str);
closesocket (is);
is = -1;
stats_failed_connect++;
continue;
}
// TODO: set TCP_NODELAY?
#else
if (err != 0) {
text_color_set(DW_COLOR_INFO);
dw_printf("Connect to IGate server %s (%s) failed.\n\n",
save_igate_config_p->t2_server_name, ipaddr_str);
(void) close (is);
is = -1;
stats_failed_connect++;
continue;
}
/* IGate documentation says to use it. */
/* Does it really make a difference for this application? */
int flag = 1;
err = setsockopt (is, IPPROTO_TCP, TCP_NODELAY, (void*)(long)(&flag), sizeof(flag));
if (err < 0) {
text_color_set(DW_COLOR_INFO);
dw_printf("setsockopt TCP_NODELAY failed.\n");
}
#endif
stats_connects++;
stats_connect_at = time(NULL);
/* Success. */
text_color_set(DW_COLOR_INFO);
dw_printf("\nNow connected to IGate server %s (%s)\n", save_igate_config_p->t2_server_name, ipaddr_str );
if (strchr(ipaddr_str, ':') != NULL) {
dw_printf("Check server status here http://[%s]:14501\n\n", ipaddr_str);
}
else {
dw_printf("Check server status here http://%s:14501\n\n", ipaddr_str);
}
/*
* Set igate_sock so everyone else can start using it.
* But make the Rx -> Internet messages wait until after login.
*/
ok_to_send = 0;
igate_sock = is;
#endif
break;
}
freeaddrinfo(ai_head);
if (igate_sock != -1) {
char stemp[256];
/*
* Send login message.
* Software name and version must not contain spaces.
*/
SLEEP_SEC(3);
snprintf (stemp, sizeof(stemp), "user %s pass %s vers Dire-Wolf %d.%d",
save_igate_config_p->t2_login, save_igate_config_p->t2_passcode,
MAJOR_VERSION, MINOR_VERSION);
if (save_igate_config_p->t2_filter != NULL) {
strlcat (stemp, " filter ", sizeof(stemp));
strlcat (stemp, save_igate_config_p->t2_filter, sizeof(stemp));
}
send_msg_to_server (stemp);
/* Delay until it is ok to start sending packets. */
SLEEP_SEC(7);
ok_to_send = 1;
}
}
/*
* If connected to IGate server, send heartbeat periodically to keep connection active.
*/
if (igate_sock != -1) {
SLEEP_SEC(10);
}
if (igate_sock != -1) {
SLEEP_SEC(10);
}
if (igate_sock != -1) {
SLEEP_SEC(10);
}
if (igate_sock != -1) {
char heartbeat[10];
strlcpy (heartbeat, "#", sizeof(heartbeat));
/* This will close the socket if any error. */
send_msg_to_server (heartbeat);
}
}
} /* end connnect_thread */
/*-------------------------------------------------------------------
*
* Name: igate_send_rec_packet
*
* Purpose: Send a packet to the IGate server
*
* Inputs: chan - Radio channel it was received on.
*
* recv_pp - Pointer to packet object.
* *** CALLER IS RESPONSIBLE FOR DELETING IT! **
*
*
* Description: Send message to IGate Server if connected.
*
* Assumptions: (1) Caller has already verified it is an APRS packet.
* i.e. control = 3 for UI frame, protocol id = 0xf0 for no layer 3
*
* (2) This is being called only for packets received with
* a correct CRC. We don't want to propagate corrupted data.
*
*--------------------------------------------------------------------*/
#define IGATE_MAX_MSG 520 /* Message to IGate max 512 characters. */
void igate_send_rec_packet (int chan, packet_t recv_pp)
{
packet_t pp;
int n;
unsigned char *pinfo;
char *p;
char msg[IGATE_MAX_MSG];
int info_len;
if (igate_sock == -1) {
return; /* Silently discard if not connected. */
}
if ( ! ok_to_send) {
return; /* Login not complete. */
}
/*
* Check for filtering from specified channel to the IGate server.
*/
if (save_digi_config_p->filter_str[chan][MAX_CHANS] != NULL) {
if (pfilter(chan, MAX_CHANS, save_digi_config_p->filter_str[chan][MAX_CHANS], recv_pp) != 1) {
text_color_set(DW_COLOR_INFO);
dw_printf ("Packet from channel %d to IGate was rejected by filter: %s\n", chan, save_digi_config_p->filter_str[chan][MAX_CHANS]);
return;
}
}
/* Gather statistics. */
stats_rf_recv_packets++;
/*
* First make a copy of it because it might be modified in place.
*/
pp = ax25_dup (recv_pp);
assert (pp != NULL);
/*
* Third party frames require special handling to unwrap payload.
*/
while (ax25_get_dti(pp) == '}') {
packet_t inner_pp;
for (n = 0; n < ax25_get_num_repeaters(pp); n++) {
char via[AX25_MAX_ADDR_LEN]; /* includes ssid. Do we want to ignore it? */
ax25_get_addr_with_ssid (pp, n + AX25_REPEATER_1, via);
if (strcmp(via, "TCPIP") == 0 ||
strcmp(via, "TCPXX") == 0 ||
strcmp(via, "RFONLY") == 0 ||
strcmp(via, "NOGATE") == 0) {
if (s_debug >= 1) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Rx IGate: Do not relay with %s in path.\n", via);
}
ax25_delete (pp);
return;
}
}
if (s_debug >= 1) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Rx IGate: Unwrap third party message.\n");
}
inner_pp = ax25_unwrap_third_party(pp);
if (inner_pp == NULL) {
ax25_delete (pp);
return;
}
ax25_delete (pp);
pp = inner_pp;
}
/*
* Do not relay packets with TCPIP, TCPXX, RFONLY, or NOGATE in the via path.
*/
for (n = 0; n < ax25_get_num_repeaters(pp); n++) {
char via[AX25_MAX_ADDR_LEN]; /* includes ssid. Do we want to ignore it? */
ax25_get_addr_with_ssid (pp, n + AX25_REPEATER_1, via);
if (strcmp(via, "TCPIP") == 0 ||
strcmp(via, "TCPXX") == 0 ||
strcmp(via, "RFONLY") == 0 ||
strcmp(via, "NOGATE") == 0) {
if (s_debug >= 1) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Rx IGate: Do not relay with %s in path.\n", via);
}
ax25_delete (pp);
return;
}
}
/*
* Do not relay generic query.
*/
if (ax25_get_dti(pp) == '?') {
if (s_debug >= 1) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Rx IGate: Do not relay generic query.\n");
}
ax25_delete (pp);
return;
}
/*
* Cut the information part at the first CR or LF.
*/
info_len = ax25_get_info (pp, &pinfo);
(void)(info_len);
if ((p = strchr ((char*)pinfo, '\r')) != NULL) {
if (s_debug >= 1) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Rx IGate: Truncated information part at CR.\n");
}
*p = '\0';
}
if ((p = strchr ((char*)pinfo, '\n')) != NULL) {
if (s_debug >= 1) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Rx IGate: Truncated information part at LF.\n");
}
*p = '\0';
}
/*
* Someone around here occasionally sends a packet with no information part.
*/
if (strlen((char*)pinfo) == 0) {
if (s_debug >= 1) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Rx IGate: Information part length is zero.\n");
}
ax25_delete (pp);
return;
}
// TODO: Should we drop raw touch tone data object type generated here?
/*
* Do not relay if a duplicate of something sent recently.
*/
if ( ! rx_to_ig_allow(pp)) {
if (s_debug >= 1) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Rx IGate: Drop duplicate of same packet seen recently.\n");
}
ax25_delete (pp);
return;
}
/*
* Finally, append ",qAR," and my call to the path.
*/
ax25_format_addrs (pp, msg);
msg[strlen(msg)-1] = '\0'; /* Remove trailing ":" */
strlcat (msg, ",qAR,", sizeof(msg));
strlcat (msg, save_audio_config_p->achan[chan].mycall, sizeof(msg));
strlcat (msg, ":", sizeof(msg));
strlcat (msg, (char*)pinfo, sizeof(msg));
send_msg_to_server (msg);
stats_rx_igate_packets++;