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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 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.
*
* 'V' Transmit UI data frame.
* Generate audio for transmission.
*
* 'H' Report recently heard stations. Not implemented yet.
*
* 'K' Transmit raw AX.25 frame.
*
* 'X' Register CallSign
*
* 'x' Unregister CallSign
*
* 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 frame in monitor format.
* (Enabled with 'm' command.)
*
*
*
* References: AGWPE TCP/IP API Tutorial
* http://uz7ho.org.ua/includes/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.
*/
#if __WIN32__
#include <winsock2.h>
#define _WIN32_WINNT 0x0501
#include <ws2tcpip.h>
#else
#include <stdlib.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#endif
#include <unistd.h>
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <time.h>
#include <ctype.h>
#include "direwolf.h"
#include "tq.h"
#include "ax25_pad.h"
#include "textcolor.h"
#include "audio.h"
#include "server.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 connect.
*/
#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. */
static int num_channels; /* Number of radio ports. */
// TODO: define in one place, use everywhere.
#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.
* Assuming little endian such as x86 or ARM.
* Byte swapping would be required for big endian cpu.
*/
#if __GNUC__
#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
#error This needs to be more portable to work on big endian.
#endif
#endif
struct agwpe_s {
short portx; /* 0 for first, 1 for second, etc. */
short port_hi_reserved;
short kind_lo; /* message type */
short kind_hi;
char call_from[10];
char call_to[10];
int data_len; /* Number of data bytes following. */
int user_reserved;
};
/*-------------------------------------------------------------------
*
* 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:
strcpy (direction, "from"); /* from the client application */
switch (pmsg->kind_lo) {
case 'P': strcpy (datakind, "Application Login"); break;
case 'X': strcpy (datakind, "Register CallSign"); break;
case 'x': strcpy (datakind, "Unregister CallSign"); break;
case 'G': strcpy (datakind, "Ask Port Information"); break;
case 'm': strcpy (datakind, "Enable Reception of Monitoring Frames"); break;
case 'R': strcpy (datakind, "AGWPE Version Info"); break;
case 'g': strcpy (datakind, "Ask Port Capabilities"); break;
case 'H': strcpy (datakind, "Callsign Heard on a Port"); break;
case 'y': strcpy (datakind, "Ask Outstanding frames waiting on a Port"); break;
case 'Y': strcpy (datakind, "Ask Outstanding frames waiting for a connection"); break;
case 'M': strcpy (datakind, "Send UNPROTO Information"); break;
case 'C': strcpy (datakind, "Connect, Start an AX.25 Connection"); break;
case 'D': strcpy (datakind, "Send Connected Data"); break;
case 'd': strcpy (datakind, "Disconnect, Terminate an AX.25 Connection"); break;
case 'v': strcpy (datakind, "Connect VIA, Start an AX.25 circuit thru digipeaters"); break;
case 'V': strcpy (datakind, "Send UNPROTO VIA"); break;
case 'c': strcpy (datakind, "Non-Standard Connections, Connection with PID"); break;
case 'K': strcpy (datakind, "Send data in raw AX.25 format"); break;
case 'k': strcpy (datakind, "Activate reception of Frames in raw format"); break;
default: strcpy (datakind, "**INVALID**"); break;
}
break;
case TO_CLIENT:
default:
strcpy (direction, "to"); /* sent to the client application. */
switch (pmsg->kind_lo) {
case 'R': strcpy (datakind, "Version Number"); break;
case 'X': strcpy (datakind, "Callsign Registration"); break;
case 'G': strcpy (datakind, "Port Information"); break;
case 'g': strcpy (datakind, "Capabilities of a Port"); break;
case 'y': strcpy (datakind, "Frames Outstanding on a Port"); break;
case 'Y': strcpy (datakind, "Frames Outstanding on a Connection"); break;
case 'H': strcpy (datakind, "Heard Stations on a Port"); break;
case 'C': strcpy (datakind, "AX.25 Connection Received"); break;
case 'D': strcpy (datakind, "Connected AX.25 Data"); break;
case 'M': strcpy (datakind, "Monitored Connected Information"); break;
case 'S': strcpy (datakind, "Monitored Supervisory Information"); break;
case 'U': strcpy (datakind, "Monitored Unproto Information"); break;
case 'T': strcpy (datakind, "Monitoring Own Information"); break;
case 'K': strcpy (datakind, "Monitored Information in Raw Format"); break;
default: strcpy (datakind, "**INVALID**"); 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, port_hi_reserved = %d\n", pmsg->portx, pmsg->port_hi_reserved);
dw_printf ("\tkind_lo = %d = '%c', kind_hi = %d\n", pmsg->kind_lo, pmsg->kind_lo, pmsg->kind_hi);
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", pmsg->data_len, pmsg->user_reserved);
hex_dump ((unsigned char*)pmsg + sizeof(struct agwpe_s), pmsg->data_len);
if (msg_len < 36) {
text_color_set (DW_COLOR_ERROR);
dw_printf ("AGWPE message length, %d, is shorter than minumum 36.\n", msg_len);
}
if (msg_len != pmsg->data_len + 36) {
text_color_set (DW_COLOR_ERROR);
dw_printf ("AGWPE message length, %d, inconsistent with data length %d.\n", msg_len, pmsg->data_len);
}
}
/*-------------------------------------------------------------------
*
* 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
*
* 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.
*
*--------------------------------------------------------------------*/
void server_init (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];
#endif
int e;
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
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;
}
num_channels = mc->num_channels;
/*
* 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 *)(unsigned int)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 *)(long)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*)client, 0, NULL);
if (cmd_listen_th[client] == NULL) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Could not create AGW command listening thread\n");
return;
}
#else
e = pthread_create (&cmd_listen_tid[client], NULL, cmd_listen_thread, (void *)(long)client);
if (e != 0) {
text_color_set(DW_COLOR_ERROR);
perror("Could not create AGW command listening thread");
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;
sprintf (server_port_str, "%d", (int)(long)arg);
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("DEBUG: serverport = %d = '%s'\n", (int)(long)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 (NULL); // TODO: what should this be for Windows?
}
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 (NULL);
}
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 (NULL);
}
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 (NULL);
}
#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());
dw_printf("Some other application is probably already using port %s.\n", server_port_str);
freeaddrinfo(ai);
closesocket(listen_sock);
WSACleanup();
return (NULL);
}
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 (NULL);
}
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 (NULL);
}
text_color_set(DW_COLOR_INFO);
dw_printf("\nConnected 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 stuct */
socklen_t sockaddr_size = sizeof(struct sockaddr_in);
int server_port = (int)(long)arg;
int listen_sock;
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);
}
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);
perror ("connect_listen_thread: Bind failed");
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("\nConnected 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 - just the information part.
*
*--------------------------------------------------------------------*/
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;
int info_len;
unsigned char *pinfo;
int client;
/*
* RAW format
*/
for (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.kind_lo = '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 = flen + 1;
/* Stick in extra byte for the "TNC" to use. */
agwpe_msg.data[0] = 0;
memcpy (agwpe_msg.data + 1, fbuf, (size_t)flen);
if (debug_client) {
debug_print (TO_CLIENT, client, &agwpe_msg.hdr, sizeof(agwpe_msg.hdr) + agwpe_msg.hdr.data_len);
}
#if __WIN32__
err = send (client_sock[client], (char*)(&agwpe_msg), sizeof(agwpe_msg.hdr) + agwpe_msg.hdr.data_len, 0);
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();
}
#else
err = write (client_sock[client], &agwpe_msg, sizeof(agwpe_msg.hdr) + agwpe_msg.hdr.data_len);
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;
}
#endif
}
}
/* MONITOR format - only for UI frames. */
for (client=0; client<MAX_NET_CLIENTS; client++) {
if (enable_send_monitor_to_client[client] && client_sock[client] > 0
&& ax25_get_control(pp) == AX25_UI_FRAME){
time_t clock;
struct tm *tm;
clock = time(NULL);
tm = localtime(&clock);
memset (&agwpe_msg.hdr, 0, sizeof(agwpe_msg.hdr));
agwpe_msg.hdr.portx = chan;
agwpe_msg.hdr.kind_lo = 'U';
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);
info_len = ax25_get_info (pp, &pinfo);
/* 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. */
sprintf (agwpe_msg.data, " %d:Fm %s To %s <UI pid=%02X Len=%d >[%02d:%02d:%02d]\r%s\r\r",
chan+1, agwpe_msg.hdr.call_from, agwpe_msg.hdr.call_to,
ax25_get_pid(pp), info_len,
tm->tm_hour, tm->tm_min, tm->tm_sec,
pinfo);
agwpe_msg.hdr.data_len = strlen(agwpe_msg.data) + 1 /* include null */ ;
if (debug_client) {
debug_print (TO_CLIENT, client, &agwpe_msg.hdr, sizeof(agwpe_msg.hdr) + agwpe_msg.hdr.data_len);
}
#if __WIN32__
err = send (client_sock[client], (char*)(&agwpe_msg), sizeof(agwpe_msg.hdr) + agwpe_msg.hdr.data_len, 0);
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();
}
#else
err = write (client_sock[client], &agwpe_msg, sizeof(agwpe_msg.hdr) + agwpe_msg.hdr.data_len);
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;
}
#endif
}
}
} /* server_send_rec_packet */
/*-------------------------------------------------------------------
*
* Name: read_from_socket
*
* Purpose: Read from socket until we have desired number of bytes.
*
* Inputs: fd - file descriptor.
* ptr - address where data should be placed.
* len - desired number of bytes.
*
* Description: Just a wrapper for the "read" system call but it should
* never return fewer than the desired number of bytes.
*
*--------------------------------------------------------------------*/
static int read_from_socket (int fd, char *ptr, int len)
{
int got_bytes = 0;
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("read_from_socket (%d, %p, %d)\n", fd, ptr, len);
#endif
while (got_bytes < len) {
int n;
#if __WIN32__
//TODO: any flags for send/recv?
n = recv (fd, ptr + got_bytes, len - got_bytes, 0);
#else
n = read (fd, ptr + got_bytes, len - got_bytes);
#endif
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("read_from_socket: n = %d\n", n);
#endif
if (n <= 0) {
return (n);
}
got_bytes += n;
}
assert (got_bytes >= 0 && got_bytes <= len);
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("read_from_socket: return %d\n", got_bytes);
#endif
return (got_bytes);
}
/*-------------------------------------------------------------------
*
* Name: cmd_listen_thread
*
* Purpose: Wait for command messages from an application.
*
* Inputs: arg - client number, 0 .. MAX_NET_CLIENTS-1
*
* Outputs: client_sock[n] - File descriptor for communicating with client app.
*
* Description: Process messages from the client application.
* Note that the client can go away and come back again and
* re-establish communication without restarting this application.
*
*--------------------------------------------------------------------*/
static THREAD_F cmd_listen_thread (void *arg)
{
int n;
struct {
struct agwpe_s hdr; /* Command header. */
char data[512]; /* Additional data used by some commands. */
/* Maximum for 'V': 1 + 8*10 + 256 */
} cmd;
int client = (int) arg;
assert (client >= 0 && client < MAX_NET_CLIENTS);
while (1) {
while (client_sock[client] <= 0) {
SLEEP_SEC(1); /* Not connected. Try again later. */
}
n = read_from_socket (client_sock[client], (char *)(&cmd.hdr), sizeof(cmd.hdr));
if (n != sizeof(cmd.hdr)) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("\nError getting message header from AGW client application %d.\n", client);
dw_printf ("Tried to read %d bytes but got only %d.\n", (int)sizeof(cmd.hdr), n);
dw_printf ("Closing connection.\n\n");
#if __WIN32__
closesocket (client_sock[client]);
#else
close (client_sock[client]);
#endif
client_sock[client] = -1;
continue;
}
/*
* Take some precautions to guard against bad data
* which could cause problems later.
*/
/*
* Call to/from must not exceeed 9 characters.
* It's not guaranteed that unused bytes will contain 0 so we
* don't issue error message in this case.
*/
cmd.hdr.call_from[sizeof(cmd.hdr.call_from)-1] = '\0';
cmd.hdr.call_to[sizeof(cmd.hdr.call_to)-1] = '\0';
/*
* Following data must fit in available buffer.
* Leave room for an extra nul byte terminator at end later.
*/
if (cmd.hdr.data_len < 0 || cmd.hdr.data_len > sizeof(cmd.data) - 1) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("\nInvalid message from AGW client application %d.\n", client);
dw_printf ("Data Length of %d is out of range.\n", cmd.hdr.data_len);
/* This is a bad situation. */
/* If we tried to read again, the header probably won't be there. */
/* No point in trying to continue reading. */
dw_printf ("Closing connection.\n\n");
#if __WIN32__
closesocket (client_sock[client]);
#else
close (client_sock[client]);
#endif
client_sock[client] = -1;
return NULL;
}
cmd.data[0] = '\0';
if (cmd.hdr.data_len > 0) {
n = read_from_socket (client_sock[client], cmd.data, cmd.hdr.data_len);
if (n != cmd.hdr.data_len) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("\nError getting message data from AGW client application %d.\n", client);
dw_printf ("Tried to read %d bytes but got only %d.\n", cmd.hdr.data_len, n);
dw_printf ("Closing connection.\n\n");
#if __WIN32__
closesocket (client_sock[client]);
#else
close (client_sock[client]);
#endif
client_sock[client] = -1;
return NULL;
}
if (n > 0) {
cmd.data[cmd.hdr.data_len] = '\0';
}
}
/*
* print & process message from client.
*/
if (debug_client) {
debug_print (FROM_CLIENT, client, &cmd.hdr, sizeof(cmd.hdr) + cmd.hdr.data_len);
}
switch (cmd.hdr.kind_lo) {
case 'R': /* Request for version number */
{
struct {
struct agwpe_s hdr;
int major_version;
int minor_version;
} reply;
memset (&reply, 0, sizeof(reply));
reply.hdr.kind_lo = 'R';
reply.hdr.data_len = sizeof(reply.major_version) + sizeof(reply.minor_version);
assert (reply.hdr.data_len ==8);
// Xastir only prints this and doesn't care otherwise.
// APRSIS32 doesn't seem to care.
// UI-View32 wants on 2000.15 or later.