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server.c
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//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
// Copyright (C) 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2020 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: server.c
*
* Purpose: Provide service to other applications via "AGW TCPIP Socket Interface".
*
* Input:
*
* Outputs:
*
* Description: This provides a TCP socket for communication with a client application.
* It implements a subset of the AGW socket interface.
*
* Commands from application recognized:
*
* 'R' Request for version number.
* (See below for response.)
*
* 'G' Ask about radio ports.
* (See below for response.)
*
* 'g' Capabilities of a port. (new in 0.8)
* (See below for response.)
*
* 'k' Ask to start receiving RAW AX25 frames.
*
* 'm' Ask to start receiving Monitor AX25 frames.
* Enables sending of U, I, S, and T messages to client app.
*
* 'V' Transmit UI data frame.
*
* 'H' Report recently heard stations. Not implemented yet.
*
* 'K' Transmit raw AX.25 frame.
*
* 'X' Register CallSign
*
* 'x' Unregister CallSign
*
* 'y' Ask Outstanding frames waiting on a Port (new in 1.2)
*
* 'Y' How many frames waiting for transmit for a particular station (new in 1.5)
*
* 'C' Connect, Start an AX.25 Connection (new in 1.4)
*
* 'v' Connect VIA, Start an AX.25 circuit thru digipeaters (new in 1.4)
*
* 'c' Connection with non-standard PID (new in 1.4)
*
* 'D' Send Connected Data (new in 1.4)
*
* 'd' Disconnect, Terminate an AX.25 Connection (new in 1.4)
*
*
* A message is printed if any others are received.
*
* TODO: Should others be implemented?
*
*
* Messages sent to client application:
*
* 'R' Reply to Request for version number.
* Currently responds with major 1, minor 0.
*
* 'G' Reply to Ask about radio ports.
*
* 'g' Reply to capabilities of a port. (new in 0.8)
*
* 'K' Received AX.25 frame in raw format.
* (Enabled with 'k' command.)
*
* 'U' Received AX.25 "UI" frames in monitor format.
* (Enabled with 'm' command.)
*
* 'I' Received AX.25 "I" frames in monitor format. (new in 1.6)
* (Enabled with 'm' command.)
*
* 'S' Received AX.25 "S" and "U" (other than UI) frames in monitor format. (new in 1.6)
* (Enabled with 'm' command.)
*
* 'T' Own Transmitted AX.25 frames in monitor format. (new in 1.6)
* (Enabled with 'm' command.)
*
* 'y' Outstanding frames waiting on a Port (new in 1.2)
*
* 'Y' How many frames waiting for transmit for a particular station (new in 1.5)
*
* 'C' AX.25 Connection Received (new in 1.4)
*
* 'D' Connected AX.25 Data (new in 1.4)
*
* 'd' Disconnected (new in 1.4)
*
*
*
* References: AGWPE TCP/IP API Tutorial
* http://uz7ho.org.ua/includes/agwpeapi.htm
*
* It has disappeared from the original location but you can find it here:
* https://web.archive.org/web/20130807113413/http:/uz7ho.org.ua/includes/agwpeapi.htm
* https://www.on7lds.net/42/sites/default/files/AGWPEAPI.HTM
*
* Getting Started with Winsock
* http://msdn.microsoft.com/en-us/library/windows/desktop/bb530742(v=vs.85).aspx
*
*
* Major change in 1.1:
*
* Formerly a single client was allowed.
* Now we can have multiple concurrent clients.
*
*---------------------------------------------------------------*/
/*
* Native Windows: Use the Winsock interface.
* Linux: Use the BSD socket interface.
* Cygwin: Can use either one.
*/
#include "direwolf.h" // Sets _WIN32_WINNT for XP API level needed by ws2tcpip.h
#if __WIN32__
#include <winsock2.h>
#include <ws2tcpip.h> // _WIN32_WINNT must be set to 0x0501 before including this
#else
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <errno.h>
#endif
#include <unistd.h>
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <time.h>
#include <ctype.h>
#include <stddef.h>
#include "tq.h"
#include "ax25_pad.h"
#include "textcolor.h"
#include "audio.h"
#include "server.h"
#include "dlq.h"
/*
* Previously, we allowed only one network connection at a time to each port.
* In version 1.1, we allow multiple concurrent client apps to attach with the AGW network protocol.
* The default is a limit of 3 client applications at the same time.
* You can increase the limit by changing the line below.
* A larger number consumes more resources so don't go crazy by making it larger than needed.
*/
// FIXME: Put in direwolf.h rather than in .c file. Change name to reflect AGW vs KISS. Update user guide 5.7.
#define MAX_NET_CLIENTS 3
static int client_sock[MAX_NET_CLIENTS];
/* File descriptor for socket for */
/* communication with client application. */
/* Set to -1 if not connected. */
/* (Don't use SOCKET type because it is unsigned.) */
static int enable_send_raw_to_client[MAX_NET_CLIENTS];
/* Should we send received packets to client app in raw form? */
/* Note that it starts as false for a new connection. */
/* the client app must send a command to enable this. */
static int enable_send_monitor_to_client[MAX_NET_CLIENTS];
/* Should we send received packets to client app in monitor form? */
/* Note that it starts as false for a new connection. */
/* the client app must send a command to enable this. */
// TODO: define in one place, use everywhere.
// TODO: Macro to terminate thread when no point to go on.
#if __WIN32__
#define THREAD_F unsigned __stdcall
#else
#define THREAD_F void *
#endif
static THREAD_F connect_listen_thread (void *arg);
static THREAD_F cmd_listen_thread (void *arg);
/*
* Message header for AGW protocol.
* Multibyte numeric values require rearranging for big endian cpu.
*/
/*
* With MinGW version 4.6, obviously x86.
* or Linux gcc version 4.9, Linux ARM.
*
* $ gcc -E -dM - < /dev/null | grep END
* #define __ORDER_LITTLE_ENDIAN__ 1234
* #define __FLOAT_WORD_ORDER__ __ORDER_LITTLE_ENDIAN__
* #define __ORDER_PDP_ENDIAN__ 3412
* #define __ORDER_BIG_ENDIAN__ 4321
* #define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
*
* This is for standard OpenWRT on MIPS.
*
* #define __ORDER_LITTLE_ENDIAN__ 1234
* #define __FLOAT_WORD_ORDER__ __ORDER_BIG_ENDIAN__
* #define __ORDER_PDP_ENDIAN__ 3412
* #define __ORDER_BIG_ENDIAN__ 4321
* #define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
*
* This was reported for an old Mac with PowerPC processor.
* (Newer versions have x86.)
*
* $ gcc -E -dM - < /dev/null | grep END
* #define __BIG_ENDIAN__ 1
* #define _BIG_ENDIAN 1
*/
#if defined(__BIG_ENDIAN__) || (defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
// gcc >= 4.2 has __builtin_swap32() but might not be compatible with older versions or other compilers.
#define host2netle(x) ( (((x)>>24)&0x000000ff) | (((x)>>8)&0x0000ff00) | (((x)<<8)&0x00ff0000) | (((x)<<24)&0xff000000) )
#define netle2host(x) ( (((x)>>24)&0x000000ff) | (((x)>>8)&0x0000ff00) | (((x)<<8)&0x00ff0000) | (((x)<<24)&0xff000000) )
#else
#define host2netle(x) (x)
#define netle2host(x) (x)
#endif
struct agwpe_s {
unsigned char portx; /* 0 for first, 1 for second, etc. */
unsigned char reserved1;
unsigned char reserved2;
unsigned char reserved3;
unsigned char datakind; /* message type, usually written as a letter. */
unsigned char reserved4;
unsigned char pid;
unsigned char reserved5;
char call_from[10];
char call_to[10];
int data_len_NETLE; /* Number of data bytes following. */
/* _NETLE suffix is reminder to convert for network byte order. */
int user_reserved_NETLE;
};
static void send_to_client (int client, void *reply_p);
/*-------------------------------------------------------------------
*
* Name: debug_print
*
* Purpose: Print message to/from client for debugging.
*
* Inputs: fromto - Direction of message.
* client - client number, 0 .. MAX_NET_CLIENTS-1
* pmsg - Address of the message block.
* msg_len - Length of the message.
*
*--------------------------------------------------------------------*/
static int debug_client = 0; /* Debug option: Print information flowing from and to client. */
void server_set_debug (int n)
{
debug_client = n;
}
void hex_dump (unsigned char *p, int len)
{
int n, i, offset;
offset = 0;
while (len > 0) {
n = len < 16 ? len : 16;
dw_printf (" %03x: ", offset);
for (i=0; i<n; i++) {
dw_printf (" %02x", p[i]);
}
for (i=n; i<16; i++) {
dw_printf (" ");
}
dw_printf (" ");
for (i=0; i<n; i++) {
dw_printf ("%c", isprint(p[i]) ? p[i] : '.');
}
dw_printf ("\n");
p += 16;
offset += 16;
len -= 16;
}
}
typedef enum fromto_e { FROM_CLIENT=0, TO_CLIENT=1 } fromto_t;
static void debug_print (fromto_t fromto, int client, struct agwpe_s *pmsg, int msg_len)
{
char direction [10];
char datakind[80];
const char *prefix [2] = { "<<<", ">>>" };
switch (fromto) {
case FROM_CLIENT:
strlcpy (direction, "from", sizeof(direction)); /* from the client application */
switch (pmsg->datakind) {
case 'P': strlcpy (datakind, "Application Login", sizeof(datakind)); break;
case 'X': strlcpy (datakind, "Register CallSign", sizeof(datakind)); break;
case 'x': strlcpy (datakind, "Unregister CallSign", sizeof(datakind)); break;
case 'G': strlcpy (datakind, "Ask Port Information", sizeof(datakind)); break;
case 'm': strlcpy (datakind, "Enable Reception of Monitoring Frames", sizeof(datakind)); break;
case 'R': strlcpy (datakind, "AGWPE Version Info", sizeof(datakind)); break;
case 'g': strlcpy (datakind, "Ask Port Capabilities", sizeof(datakind)); break;
case 'H': strlcpy (datakind, "Callsign Heard on a Port", sizeof(datakind)); break;
case 'y': strlcpy (datakind, "Ask Outstanding frames waiting on a Port", sizeof(datakind)); break;
case 'Y': strlcpy (datakind, "Ask Outstanding frames waiting for a connection", sizeof(datakind)); break;
case 'M': strlcpy (datakind, "Send UNPROTO Information", sizeof(datakind)); break;
case 'C': strlcpy (datakind, "Connect, Start an AX.25 Connection", sizeof(datakind)); break;
case 'D': strlcpy (datakind, "Send Connected Data", sizeof(datakind)); break;
case 'd': strlcpy (datakind, "Disconnect, Terminate an AX.25 Connection", sizeof(datakind)); break;
case 'v': strlcpy (datakind, "Connect VIA, Start an AX.25 circuit thru digipeaters", sizeof(datakind)); break;
case 'V': strlcpy (datakind, "Send UNPROTO VIA", sizeof(datakind)); break;
case 'c': strlcpy (datakind, "Non-Standard Connections, Connection with PID", sizeof(datakind)); break;
case 'K': strlcpy (datakind, "Send data in raw AX.25 format", sizeof(datakind)); break;
case 'k': strlcpy (datakind, "Activate reception of Frames in raw format", sizeof(datakind)); break;
default: strlcpy (datakind, "**INVALID**", sizeof(datakind)); break;
}
break;
case TO_CLIENT:
default:
strlcpy (direction, "to", sizeof(direction)); /* sent to the client application. */
switch (pmsg->datakind) {
case 'R': strlcpy (datakind, "Version Number", sizeof(datakind)); break;
case 'X': strlcpy (datakind, "Callsign Registration", sizeof(datakind)); break;
case 'G': strlcpy (datakind, "Port Information", sizeof(datakind)); break;
case 'g': strlcpy (datakind, "Capabilities of a Port", sizeof(datakind)); break;
case 'y': strlcpy (datakind, "Frames Outstanding on a Port", sizeof(datakind)); break;
case 'Y': strlcpy (datakind, "Frames Outstanding on a Connection", sizeof(datakind)); break;
case 'H': strlcpy (datakind, "Heard Stations on a Port", sizeof(datakind)); break;
case 'C': strlcpy (datakind, "AX.25 Connection Received", sizeof(datakind)); break;
case 'D': strlcpy (datakind, "Connected AX.25 Data", sizeof(datakind)); break;
case 'd': strlcpy (datakind, "Disconnected", sizeof(datakind)); break;
case 'I': strlcpy (datakind, "Monitored Connected Information", sizeof(datakind)); break;
case 'S': strlcpy (datakind, "Monitored Supervisory Information", sizeof(datakind)); break;
case 'U': strlcpy (datakind, "Monitored Unproto Information", sizeof(datakind)); break;
case 'T': strlcpy (datakind, "Monitoring Own Information", sizeof(datakind)); break;
case 'K': strlcpy (datakind, "Monitored Information in Raw Format", sizeof(datakind)); break;
default: strlcpy (datakind, "**INVALID**", sizeof(datakind)); break;
}
}
text_color_set(DW_COLOR_DEBUG);
dw_printf ("\n");
dw_printf ("%s %s %s AGWPE client application %d, total length = %d\n",
prefix[(int)fromto], datakind, direction, client, msg_len);
dw_printf ("\tportx = %d, datakind = '%c', pid = 0x%02x\n", pmsg->portx, pmsg->datakind, pmsg->pid);
dw_printf ("\tcall_from = \"%s\", call_to = \"%s\"\n", pmsg->call_from, pmsg->call_to);
dw_printf ("\tdata_len = %d, user_reserved = %d, data =\n", netle2host(pmsg->data_len_NETLE), netle2host(pmsg->user_reserved_NETLE));
hex_dump ((unsigned char*)pmsg + sizeof(struct agwpe_s), netle2host(pmsg->data_len_NETLE));
if (msg_len < 36) {
text_color_set (DW_COLOR_ERROR);
dw_printf ("AGWPE message length, %d, is shorter than minimum 36.\n", msg_len);
}
if (msg_len != netle2host(pmsg->data_len_NETLE) + 36) {
text_color_set (DW_COLOR_ERROR);
dw_printf ("AGWPE message length, %d, inconsistent with data length %d.\n", msg_len, netle2host(pmsg->data_len_NETLE));
}
}
/*-------------------------------------------------------------------
*
* Name: server_init
*
* Purpose: Set up a server to listen for connection requests from
* an application such as Xastir.
*
* Inputs: mc->agwpe_port - TCP port for server.
* Main program has default of 8000 but allows
* an alternative to be specified on the command line
*
* 0 means disable. New in version 1.2.
*
* Outputs:
*
* Description: This starts at least two threads:
* * one to listen for a connection from client app.
* * one or more to listen for commands from client app.
* so the main application doesn't block while we wait for these.
*
*--------------------------------------------------------------------*/
static struct audio_s *save_audio_config_p;
void server_init (struct audio_s *audio_config_p, struct misc_config_s *mc)
{
int client;
#if __WIN32__
HANDLE connect_listen_th;
HANDLE cmd_listen_th[MAX_NET_CLIENTS];
#else
pthread_t connect_listen_tid;
pthread_t cmd_listen_tid[MAX_NET_CLIENTS];
int e;
#endif
int server_port = mc->agwpe_port; /* Usually 8000 but can be changed. */
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("server_init ( %d )\n", server_port);
debug_a = 1;
#endif
save_audio_config_p = audio_config_p;
for (client=0; client<MAX_NET_CLIENTS; client++) {
client_sock[client] = -1;
enable_send_raw_to_client[client] = 0;
enable_send_monitor_to_client[client] = 0;
}
if (server_port == 0) {
text_color_set(DW_COLOR_INFO);
dw_printf ("Disabled AGW network client port.\n");
return;
}
/*
* This waits for a client to connect and sets an available client_sock[n].
*/
#if __WIN32__
connect_listen_th = (HANDLE)_beginthreadex (NULL, 0, connect_listen_thread, (void *)(ptrdiff_t)server_port, 0, NULL);
if (connect_listen_th == NULL) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Could not create AGW connect listening thread\n");
return;
}
#else
e = pthread_create (&connect_listen_tid, NULL, connect_listen_thread, (void *)(ptrdiff_t)server_port);
if (e != 0) {
text_color_set(DW_COLOR_ERROR);
perror("Could not create AGW connect listening thread");
return;
}
#endif
/*
* These read messages from client when client_sock[n] is valid.
* Currently we start up a separate thread for each potential connection.
* Possible later refinement. Start one now, others only as needed.
*/
for (client = 0; client < MAX_NET_CLIENTS; client++) {
#if __WIN32__
cmd_listen_th[client] = (HANDLE)_beginthreadex (NULL, 0, cmd_listen_thread, (void*)(ptrdiff_t)client, 0, NULL);
if (cmd_listen_th[client] == NULL) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Could not create AGW command listening thread for client %d\n", client);
return;
}
#else
e = pthread_create (&cmd_listen_tid[client], NULL, cmd_listen_thread, (void *)(ptrdiff_t)client);
if (e != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Could not create AGW command listening thread for client %d\n", client);
// Replace add perror with better message handling.
perror("");
return;
}
#endif
}
}
/*-------------------------------------------------------------------
*
* Name: connect_listen_thread
*
* Purpose: Wait for a connection request from an application.
*
* Inputs: arg - TCP port for server.
* Main program has default of 8000 but allows
* an alternative to be specified on the command line
*
* Outputs: client_sock - File descriptor for communicating with client app.
*
* Description: Wait for connection request from client and establish
* communication.
* Note that the client can go away and come back again and
* re-establish communication without restarting this application.
*
*--------------------------------------------------------------------*/
static THREAD_F connect_listen_thread (void *arg)
{
#if __WIN32__
struct addrinfo hints;
struct addrinfo *ai = NULL;
int err;
char server_port_str[12];
SOCKET listen_sock;
WSADATA wsadata;
snprintf (server_port_str, sizeof(server_port_str), "%d", (int)(ptrdiff_t)arg);
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("DEBUG: serverport = %d = '%s'\n", (int)(ptrdiff_t)arg, server_port_str);
#endif
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);
}
memset (&hints, 0, sizeof(hints));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
hints.ai_flags = AI_PASSIVE;
err = getaddrinfo(NULL, server_port_str, &hints, &ai);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf("getaddrinfo failed: %d\n", err);
//sleep (1);
WSACleanup();
return (0);
}
listen_sock= socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (listen_sock == INVALID_SOCKET) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("connect_listen_thread: Socket creation failed, err=%d", WSAGetLastError());
return (0);
}
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf("Binding to port %s ... \n", server_port_str);
#endif
err = bind( listen_sock, ai->ai_addr, (int)ai->ai_addrlen);
if (err == SOCKET_ERROR) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Bind failed with error: %d\n", WSAGetLastError()); // TODO: translate number to text?
dw_printf("Some other application is probably already using port %s.\n", server_port_str);
dw_printf("Try using a different port number with AGWPORT in the configuration file.\n");
freeaddrinfo(ai);
closesocket(listen_sock);
WSACleanup();
return (0);
}
freeaddrinfo(ai);
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf("opened socket as fd (%d) on port (%s) for stream i/o\n", listen_sock, server_port_str );
#endif
while (1) {
int client;
int c;
client = -1;
for (c = 0; c < MAX_NET_CLIENTS && client < 0; c++) {
if (client_sock[c] <= 0) {
client = c;
}
}
/*
* Listen for connection if we have not reached maximum.
*/
if (client >= 0) {
if(listen(listen_sock, MAX_NET_CLIENTS) == SOCKET_ERROR)
{
text_color_set(DW_COLOR_ERROR);
dw_printf("Listen failed with error: %d\n", WSAGetLastError());
return (0);
}
text_color_set(DW_COLOR_INFO);
dw_printf("Ready to accept AGW client application %d on port %s ...\n", client, server_port_str);
client_sock[client] = accept(listen_sock, NULL, NULL);
if (client_sock[client] == -1) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Accept failed with error: %d\n", WSAGetLastError());
closesocket(listen_sock);
WSACleanup();
return (0);
}
text_color_set(DW_COLOR_INFO);
dw_printf("\nAttached to AGW client application %d ...\n\n", client);
/*
* The command to change this is actually a toggle, not explicit on or off.
* Make sure it has proper state when we get a new connection.
*/
enable_send_raw_to_client[client] = 0;
enable_send_monitor_to_client[client] = 0;
}
else {
SLEEP_SEC(1); /* wait then check again if more clients allowed. */
}
}
#else /* End of Windows case, now Linux */
struct sockaddr_in sockaddr; /* Internet socket address struct */
socklen_t sockaddr_size = sizeof(struct sockaddr_in);
int server_port = (int)(ptrdiff_t)arg;
int listen_sock;
int bcopt = 1;
listen_sock= socket(AF_INET,SOCK_STREAM,0);
if (listen_sock == -1) {
text_color_set(DW_COLOR_ERROR);
perror ("connect_listen_thread: Socket creation failed");
return (NULL);
}
/* Version 1.3 - as suggested by G8BPQ. */
/* Without this, if you kill the application then try to run it */
/* again quickly the port number is unavailable for a while. */
/* Don't try doing the same thing On Windows; It has a different meaning. */
/* http://stackoverflow.com/questions/14388706/socket-options-so-reuseaddr-and-so-reuseport-how-do-they-differ-do-they-mean-t */
setsockopt (listen_sock, SOL_SOCKET, SO_REUSEADDR, (const char *)&bcopt, 4);
sockaddr.sin_addr.s_addr = INADDR_ANY;
sockaddr.sin_port = htons(server_port);
sockaddr.sin_family = AF_INET;
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf("Binding to port %d ... \n", server_port);
#endif
if (bind(listen_sock,(struct sockaddr*)&sockaddr,sizeof(sockaddr)) == -1) {
text_color_set(DW_COLOR_ERROR);
dw_printf("Bind failed with error: %d\n", errno);
dw_printf("%s\n", strerror(errno));
dw_printf("Some other application is probably already using port %d.\n", server_port);
dw_printf("Try using a different port number with AGWPORT in the configuration file.\n");
return (NULL);
}
getsockname( listen_sock, (struct sockaddr *)(&sockaddr), &sockaddr_size);
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf("opened socket as fd (%d) on port (%d) for stream i/o\n", listen_sock, ntohs(sockaddr.sin_port) );
#endif
while (1) {
int client;
int c;
client = -1;
for (c = 0; c < MAX_NET_CLIENTS && client < 0; c++) {
if (client_sock[c] <= 0) {
client = c;
}
}
if (client >= 0) {
if(listen(listen_sock,MAX_NET_CLIENTS) == -1)
{
text_color_set(DW_COLOR_ERROR);
perror ("connect_listen_thread: Listen failed");
return (NULL);
}
text_color_set(DW_COLOR_INFO);
dw_printf("Ready to accept AGW client application %d on port %d ...\n", client, server_port);
client_sock[client] = accept(listen_sock, (struct sockaddr*)(&sockaddr),&sockaddr_size);
text_color_set(DW_COLOR_INFO);
dw_printf("\nAttached to AGW client application %d...\n\n", client);
/*
* The command to change this is actually a toggle, not explicit on or off.
* Make sure it has proper state when we get a new connection.
*/
enable_send_raw_to_client[client] = 0;
enable_send_monitor_to_client[client] = 0;
}
else {
SLEEP_SEC(1); /* wait then check again if more clients allowed. */
}
}
#endif
}
/*-------------------------------------------------------------------
*
* Name: server_send_rec_packet
*
* Purpose: Send a received packet to the client app.
*
* Inputs: chan - Channel number where packet was received.
* 0 = first, 1 = second if any.
*
* pp - Identifier for packet object.
*
* fbuf - Address of raw received frame buffer.
* flen - Length of raw received frame.
*
*
* Description: Send message to client if connected.
* Disconnect from client, and notify user, if any error.
*
* There are two different formats:
* RAW - the original received frame.
* MONITOR - human readable monitoring format.
*
*--------------------------------------------------------------------*/
static void mon_addrs (int chan, packet_t pp, char *result, int result_size);
static char mon_desc (packet_t pp, char *result, int result_size);
void server_send_rec_packet (int chan, packet_t pp, unsigned char *fbuf, int flen)
{
struct {
struct agwpe_s hdr;
char data[1+AX25_MAX_PACKET_LEN];
} agwpe_msg;
int err;
/*
* RAW format
*/
for (int client=0; client<MAX_NET_CLIENTS; client++) {
if (enable_send_raw_to_client[client] && client_sock[client] > 0){
memset (&agwpe_msg.hdr, 0, sizeof(agwpe_msg.hdr));
agwpe_msg.hdr.portx = chan;
agwpe_msg.hdr.datakind = 'K';
ax25_get_addr_with_ssid (pp, AX25_SOURCE, agwpe_msg.hdr.call_from);
ax25_get_addr_with_ssid (pp, AX25_DESTINATION, agwpe_msg.hdr.call_to);
agwpe_msg.hdr.data_len_NETLE = host2netle(flen + 1);
/* Stick in extra byte for the "TNC" to use. */
agwpe_msg.data[0] = chan << 4; // Was 0. Fixed in 1.8.
memcpy (agwpe_msg.data + 1, fbuf, (size_t)flen);
if (debug_client) {
debug_print (TO_CLIENT, client, &agwpe_msg.hdr, sizeof(agwpe_msg.hdr) + netle2host(agwpe_msg.hdr.data_len_NETLE));
}
#if __WIN32__
err = SOCK_SEND (client_sock[client], (char*)(&agwpe_msg), sizeof(agwpe_msg.hdr) + netle2host(agwpe_msg.hdr.data_len_NETLE));
if (err == SOCKET_ERROR)
{
text_color_set(DW_COLOR_ERROR);
dw_printf ("\nError %d sending message to AGW client application. Closing connection.\n\n", WSAGetLastError());
closesocket (client_sock[client]);
client_sock[client] = -1;
WSACleanup();
dlq_client_cleanup (client);
}
#else
err = SOCK_SEND (client_sock[client], &agwpe_msg, sizeof(agwpe_msg.hdr) + netle2host(agwpe_msg.hdr.data_len_NETLE));
if (err <= 0)
{
text_color_set(DW_COLOR_ERROR);
dw_printf ("\nError sending message to AGW client application. Closing connection.\n\n");
close (client_sock[client]);
client_sock[client] = -1;
dlq_client_cleanup (client);
}
#endif
}
}
// Application might want more human readable format.
server_send_monitored (chan, pp, 0);
} /* end server_send_rec_packet */
void server_send_monitored (int chan, packet_t pp, int own_xmit)
{
/*
* MONITOR format - 'I' for information frames.
* 'U' for unnumbered information.
* 'S' for supervisory and other unnumbered.
*/
struct {
struct agwpe_s hdr;
char data[128+AX25_MAX_PACKET_LEN]; // Add plenty of room for header prefix.
} agwpe_msg;
int err;
for (int client=0; client<MAX_NET_CLIENTS; client++) {
if (enable_send_monitor_to_client[client] && client_sock[client] > 0) {
memset (&agwpe_msg.hdr, 0, sizeof(agwpe_msg.hdr));
agwpe_msg.hdr.portx = chan; // datakind is added later.
ax25_get_addr_with_ssid (pp, AX25_SOURCE, agwpe_msg.hdr.call_from);
ax25_get_addr_with_ssid (pp, AX25_DESTINATION, agwpe_msg.hdr.call_to);
/* http://uz7ho.org.ua/includes/agwpeapi.htm#_Toc500723812 */
/* Description mentions one CR character after timestamp but example has two. */
/* Actual observed cases have only one. */
/* Also need to add extra CR, CR, null at end. */
/* The documentation example includes these 3 extra in the Len= value */
/* but actual observed data uses only the packet info length. */
// Documentation doesn't mention anything about including the via path.
// In version 1.4, we add that to match observed behaviour.
// This inconsistency was reported:
// Direwolf:
// [AGWE-IN] 1:Fm ZL4FOX-8 To Q7P2U2 [08:25:07]`I1*l V>/"9<}[:Barts Tracker 3.83V X
// AGWPE:
// [AGWE-IN] 1:Fm ZL4FOX-8 To Q7P2U2 Via WIDE3-3 [08:32:14]`I0*l V>/"98}[:Barts Tracker 3.83V X
// Format the channel and addresses, with leading and trailing space.
mon_addrs (chan, pp, (char*)(agwpe_msg.data), sizeof(agwpe_msg.data));
// Add the description with <... >
char desc[120];
agwpe_msg.hdr.datakind = mon_desc (pp, desc, sizeof(desc));
if (own_xmit) {
agwpe_msg.hdr.datakind = 'T';
}
strlcat ((char*)(agwpe_msg.data), desc, sizeof(agwpe_msg.data));
// Timestamp with [...]\r
time_t clock = time(NULL);
struct tm *tm = localtime(&clock); // TODO: use localtime_r ?
char ts[32];
snprintf (ts, sizeof(ts), "[%02d:%02d:%02d]\r", tm->tm_hour, tm->tm_min, tm->tm_sec);
strlcat ((char*)(agwpe_msg.data), ts, sizeof(agwpe_msg.data));
// Information if any with \r.
unsigned char *pinfo = NULL;
int info_len = ax25_get_info (pp, &pinfo);
int msg_data_len = strlen((char*)(agwpe_msg.data)); // result length so far
if (info_len > 0 && pinfo != NULL) {
// Issue 367: Use of strlcat truncated information part at any nul character.
// Use memcpy instead to preserve binary data, e.g. NET/ROM.
memcpy (agwpe_msg.data + msg_data_len, pinfo, info_len);
msg_data_len += info_len;
agwpe_msg.data[msg_data_len++] = '\r';
}
agwpe_msg.data[msg_data_len++] = '\0'; // add nul at end, included in length.
agwpe_msg.hdr.data_len_NETLE = host2netle(msg_data_len);
if (debug_client) {
debug_print (TO_CLIENT, client, &agwpe_msg.hdr, sizeof(agwpe_msg.hdr) + netle2host(agwpe_msg.hdr.data_len_NETLE));
}
#if __WIN32__
err = SOCK_SEND (client_sock[client], (char*)(&agwpe_msg), sizeof(agwpe_msg.hdr) + netle2host(agwpe_msg.hdr.data_len_NETLE));
if (err == SOCKET_ERROR)
{
text_color_set(DW_COLOR_ERROR);
dw_printf ("\nError %d sending message to AGW client application %d. Closing connection.\n\n", WSAGetLastError(), client);
closesocket (client_sock[client]);
client_sock[client] = -1;
WSACleanup();
dlq_client_cleanup (client);
}
#else
err = SOCK_SEND (client_sock[client], &agwpe_msg, sizeof(agwpe_msg.hdr) + netle2host(agwpe_msg.hdr.data_len_NETLE));
if (err <= 0)
{
text_color_set(DW_COLOR_ERROR);
dw_printf ("\nError sending message to AGW client application %d. Closing connection.\n\n", client);
close (client_sock[client]);
client_sock[client] = -1;
dlq_client_cleanup (client);
}
#endif
}
}
} /* server_send_monitored */
// Next two are broken out in case they can be reused elsewhere.
// Format addresses in AGWPR monitoring format such as:
// 1:Fm ZL4FOX-8 To Q7P2U2 Via WIDE3-3
// Issue 530 pointed out that in this situation it is customary to put * after each used address,
// not just the last used as in the TNC-2 monitoring format.
static void mon_addrs (int chan, packet_t pp, char *result, int result_size)
{
char src[AX25_MAX_ADDR_LEN];
char dst[AX25_MAX_ADDR_LEN];
ax25_get_addr_with_ssid (pp, AX25_SOURCE, src);
ax25_get_addr_with_ssid (pp, AX25_DESTINATION, dst);
int num_digi = ax25_get_num_repeaters(pp);
if (num_digi > 0) {
char via[AX25_MAX_REPEATERS*(AX25_MAX_ADDR_LEN+1)]; // complete via path
strlcpy (via, "", sizeof(via));
for (int j = 0; j < num_digi; j++) {
char digiaddr[AX25_MAX_ADDR_LEN];
if (j != 0) {
strlcat (via, ",", sizeof(via)); // comma if not first address
}