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root/wconsd.c @ 6731132f

/*
* wconsd.c - serial port server service for Windows NT
*
* Copyright (c) 2008 Hamish Coleman <hamish@zot.org>
* 2003 Benjamin Schweizer <gopher at h07 dot org>
* 1998 Stephen Early <Stephen.Early@cl.cam.ac.uk>
*
*
* 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/* Note: winsock2.h MUST be included before windows.h */

#include <winsock2.h>
#include <ws2tcpip.h>
#include <windows.h>
#include <winsvc.h>
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>

#include "scm.h"

#include "libcli/libcli.h"

#define VERSION "0.2.6"

/* Size of buffers for send and receive */
#define BUFSIZE 1024
#define MAXLEN 1024

/* Sockets for listening and communicating */
SOCKET ls=INVALID_SOCKET;

/* Event objects */
HANDLE stopEvent;
HANDLE readEvent, writeEvent;
WSAEVENT listenSocketEvent;

/* COM port */
DCB dcb;
COMMTIMEOUTS timeouts;

/* Port default settings are here */
int com_port=1;
DWORD com_speed=9600;
BYTE com_data=8;
BYTE com_parity=NOPARITY;
BYTE com_stop=ONESTOPBIT;

int default_tcpport = 23;

/* TODO - these buffers are ugly and large */
char *hostname[BUFSIZE];
struct hostent *host_entry;

/* Service status: our current status, and handle on service manager */
SERVICE_STATUS wconsd_status;
SERVICE_STATUS_HANDLE wconsd_statusHandle;


/* these match the official telnet codes */
#define TELNET_OPTION_SB 0xfa
#define TELNET_OPTION_WILL 0xfb
#define TELNET_OPTION_WONT 0xfc
#define TELNET_OPTION_DO 0xfd
#define TELNET_OPTION_DONT 0xfe
#define TELNET_OPTION_IAC 0xff

/* these are my local state-tracking codes */
#define TELNET_OPTION_SBXX 0xfa00 /* received IAC SB xx */

#define MAXCONNECTIONS 8

int next_connection_id = 1; /* lifetime unique connection id */
int next_connection_slot = 0; /* next slot to look at for new connection */
struct connection {
int active; /* an active entry cannot be reused */
int id; /* connection identifier */
HANDLE menuThread;
SOCKET net;
int serialconnected;
HANDLE serial;
HANDLE serialThread;
int option_runmenu; /* are we at the menu? */
int option_binary; /* binary transmission requested */
int option_echo; /* will we echo chars received? */
int option_keepalive; /* will we send IAC NOPs all the time? */
int net_bytes_rx;
int net_bytes_tx;
struct sockaddr *sa;
int telnet_option; /* Set to indicate option processing status */
int telnet_option_param;/* saved parameters from telnet options */
};
struct connection connection[MAXCONNECTIONS];

struct cli_def *cli;

int wconsd_init(int argc, char **argv);
int wconsd_main(int param1);
int wconsd_stop(int param1);
struct SCM_def sd = {
"wconsd","wconsd - Telnet to Serial server",
wconsd_init, wconsd_main, wconsd_stop
};

/*
* output from OutputDebugStringA can be seen using sysinternals debugview
* http://technet.microsoft.com/en-us/sysinternals/bb896647.aspx
*/

/*
* log a debug message
*/
int dprintf_level = 1;
int dprintf_to_stdout = 0;
int dprintf(unsigned char severity, const char *fmt, ...) {
va_list args;
char buf[MAXLEN];
int i;

if (severity > dprintf_level)
return 0;

va_start(args,fmt);
i=vsnprintf(buf,sizeof(buf),fmt,args);
va_end(args);

if (dprintf_to_stdout) {
printf("%s",buf);
} else {
OutputDebugStringA(buf);
}

return i;
}

/*
* format a string and send it to a net connection
*/
int netprintf(struct connection *conn, const char *fmt, ...) {
va_list args;
char buf[MAXLEN];
int i;
int bytes;

va_start(args,fmt);
i=vsnprintf(buf,sizeof(buf),fmt,args);
va_end(args);

bytes = send(conn->net,buf,(i>MAXLEN)?MAXLEN-1:i,0);

if (bytes==-1) {
dprintf(1,"wconsd[%i]: netprintf: send error %i\n",conn->id,GetLastError());
} else {
conn->net_bytes_tx += bytes;
}

return i;
}

/* open the com port */
int open_com_port(struct connection *conn) {
/* Open the COM port */
char portstr[12];

if (conn->serialconnected) {
dprintf(1,"wcons[%i]: open_com_port: serialconnected\n",conn->id);
}

sprintf(portstr, "\\\\.\\COM%d", com_port);
conn->serial = CreateFile(portstr,
GENERIC_READ | GENERIC_WRITE,
0, // Exclusive access
NULL,
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED,
NULL);
if (conn->serial == INVALID_HANDLE_VALUE) {
return -1;
}

if (!GetCommState(conn->serial, &dcb)) {
return -1;
}

// Fill in the device control block
dcb.BaudRate=com_speed;
dcb.ByteSize=com_data;
dcb.Parity=com_parity; // NOPARITY, ODDPARITY, EVENPARITY
dcb.StopBits=com_stop; // ONESTOPBIT, ONE5STOPBITS, TWOSTOPBITS
dcb.fBinary=TRUE;
dcb.fOutxCtsFlow=FALSE;
dcb.fOutxDsrFlow=FALSE;
dcb.fDtrControl=DTR_CONTROL_ENABLE; // Always on
dcb.fDsrSensitivity=FALSE;
dcb.fTXContinueOnXoff=FALSE;
dcb.fOutX=FALSE;
dcb.fInX=FALSE;
dcb.fErrorChar=FALSE;
dcb.fNull=FALSE;
dcb.fRtsControl=RTS_CONTROL_ENABLE; // Always on
dcb.fAbortOnError=FALSE;

if (!SetCommState(conn->serial, &dcb)) {
return -1;
}

/* FIXME - these values need much more tuning */
timeouts.ReadIntervalTimeout=20;
timeouts.ReadTotalTimeoutMultiplier=0;
/*
* Note that this means that the serial to net thread wakes
* each and ever 50 milliseconds
*/
timeouts.ReadTotalTimeoutConstant=50;
timeouts.WriteTotalTimeoutMultiplier=0;
timeouts.WriteTotalTimeoutConstant=0;
if (!SetCommTimeouts(conn->serial, &timeouts)) {
return -1;
}
conn->serialconnected=1;
return 0;
}

/* close the com port */
void close_com_port(struct connection *conn) {
CloseHandle(conn->serial);
conn->serial=INVALID_HANDLE_VALUE;
conn->serialconnected=0;
}

/*
* Given an active connection, force close its
* serial port. waiting for all relevant resources
*/
void close_serial_connection(struct connection *conn) {
if (!conn->active) {
dprintf(1,"wconsd: closing closed connection %i\n",conn->id);
return;
}
conn->option_runmenu=1;
close_com_port(conn);
WaitForSingleObject(conn->serialThread,INFINITE);
CloseHandle(conn->serialThread);
conn->serialThread=NULL;
}

static void usage(const char *name, struct option *option)
{
printf("Usage: %s [-i pathname | -r | -d | -p port ]\n",name);
printf("Just start with no options to start server\n");
printf(" -i install service 'wconsd'\n");
printf(" -r remove service 'wconsd'\n");
printf(" -d run wconsd in foreground mode\n");
printf(" -p port listen on the given port in foreground mode\n");

printf("\n");
while(option->name) {
printf("--%s%s ",option->name,option->has_arg?"=VAL":"");
option++;
}
printf("\n\n");

}

#define GETOPT_INIT 1
#define GETOPT_SCMINIT 2

static int do_getopt(const int whence, const int argc, char **argv) {
static struct option long_options[] = {
{"install", 0, 0, 'i'},
{"remove", 0, 0, 'r'},
{"debug", 2, 0, 'd'},
{"port", 1, 0, 'p'},
{0,0,0,0}
};

while(1) {
int c = getopt_long(argc,argv, "ird::p:",
long_options,NULL);
if (c==-1)
break;

switch(c) {
case 'i': {
/* request service installation */
char *path = SCM_Install(&sd);
if (!path) {
printf("Service installation failed\n");
return 1;
}
printf("Service '%s' installed, binary path '%s'\n",sd.name,path);
printf("You should now start the service using the service manager.\n");
return 0;
}
case 'r':
// request service removal
if (SCM_Remove(&sd)==0) {
printf("Deleted service '%s'\n",sd.name);
} else {
printf("Service removal failed\n");
}
return 0;
case 'd':
if (optarg) {
dprintf_level = atoi(optarg);
}
break;
case 'p':
if (optarg) {
default_tcpport = atoi(optarg);
}
break;
default:
usage("wconsd",long_options);
exit(EXIT_FAILURE);
}
}
return 1;
}

int wconsd_stop(int param1) {
SetEvent(stopEvent);
return 0;
}

int libcli_test(struct cli_def *cli, char *command, char *argv[], int argc) {
int i;
cli_print(cli, "called %s with \"%s\"", __FUNCTION__, command);
cli_print(cli, "%d arguments:", argc);
for (i = 0; i < argc; i++)
cli_print(cli, " %s", argv[i]);

return CLI_OK;
}


/* Initialise wconsd: open a listening socket and the COM port, and
* create lots of event objects. */
int wconsd_init(int argc, char **argv) {
struct sockaddr_in sin;
WORD wVersionRequested;
WSADATA wsaData;
int err;

/* setup the libcli early so that modules can use it */
if (!(cli = cli_init())) {
dprintf(1,"wconsd: wconsd_init: failed run cli_init\n");
return 13;
}
modules_init(cli);

/* do_getopt(GETOPT_SCMINIT,argc,argv) */

/* Start up sockets */
wVersionRequested = MAKEWORD( 2, 2 );
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 ) {
/* Tell the user that we could not find a usable */
/* WinSock DLL. */
return 1;
}
/* Confirm that the WinSock DLL supports 2.2.*/
/* Note that if the DLL supports versions greater */
/* than 2.2 in addition to 2.2, it will still return */
/* 2.2 in wVersion since that is the version we */
/* requested. */
if ( LOBYTE( wsaData.wVersion ) != 2 ||
HIBYTE( wsaData.wVersion ) != 2 ) {
/* Tell the user that we could not find a usable */
/* WinSock DLL. */
WSACleanup( );
return 2;
}

/* The WinSock DLL is acceptable. Proceed. */

// Create the event object used to signal service shutdown
stopEvent = CreateEvent(NULL,TRUE,FALSE,NULL);
if (stopEvent==NULL) {
return 3;
}
// Event objects for overlapped IO
readEvent = CreateEvent(NULL,TRUE,FALSE,NULL);
if (readEvent==NULL) {
return 6;
}
writeEvent = CreateEvent(NULL,TRUE,FALSE,NULL);
if (writeEvent==NULL) {
return 7;
}
// Create the event object for socket operations
listenSocketEvent = WSACreateEvent();
if (listenSocketEvent==WSA_INVALID_EVENT) {
return 8;
}

if (gethostname((char *)hostname,sizeof(hostname))==SOCKET_ERROR) {
return 1;
}
dprintf(1,"wconsd: Hostname is %s\n",hostname);

host_entry=gethostbyname((char *)hostname);
if (host_entry->h_addrtype==AF_INET) {
dprintf(1,"wconsd: IP Address is %s\n",inet_ntoa (*(struct in_addr *)*host_entry->h_addr_list));
/* FIXME - enumerate all the IP addresses from the list */
} else {
host_entry=0;
return 0;
}

/* Create a socket to listen for connections. */
memset(&sin,0,sizeof(sin));
sin.sin_family=AF_INET;
sin.sin_port=htons(default_tcpport);
ls=socket(AF_INET,SOCK_STREAM,0);
if (ls==INVALID_SOCKET) {
return 9;
}
#ifndef MS_WINDOWS
{
int one=1;
setsockopt(ls,SOL_SOCKET,SO_REUSEADDR,(void*)&one,sizeof(one));
}
#endif
if (bind(ls,(struct sockaddr *)&sin,sizeof(sin))==SOCKET_ERROR) {
dprintf(1,"wconsd: wconsd_init: failed to bind socket\n");
return 10;
}
if (listen(ls,1)==SOCKET_ERROR) {
return 11;
}
dprintf(1,"wconsd: listening on port %i\n",default_tcpport);


/* Mark the socket as non-blocking */
if (WSAEventSelect(ls,listenSocketEvent,FD_ACCEPT)==SOCKET_ERROR) {
return 12;
}

cli_set_banner(cli, "wconsd serial to telnet");
cli_set_hostname(cli, (char *)hostname);
cli_set_idle_timeout(cli, 60);
cli_register_command(cli, NULL, "test", libcli_test, PRIVILEGE_UNPRIVILEGED,
MODE_EXEC, NULL);
#if 0
cli_set_auth_callback(cli, check_auth);
cli_set_enable_callback(cli, check_enable);
#endif

return 0;
}

/*
* telnet option receiver state machine.
* Called with the current char, it saves the intermediate state in the
* conn struct.
*
* Returns 0 to indicate no echo of this char, or 0xff to indicate that the
* char should be echoed.
*/
unsigned char process_telnet_option(struct connection*conn, unsigned char ch) {
dprintf(2,"wconsd[%i]: debug option (0x%02x) 0x%02x\n",conn->id,conn->telnet_option,ch);

switch (conn->telnet_option) {
case 0: /* received nothing */
if (ch==TELNET_OPTION_IAC) {
conn->telnet_option=ch;
return 0; /* dont echo */
}
return 0xff; /* ECHO */

case TELNET_OPTION_IAC: /* recived IAC */
switch(ch) {
case 0xf0: /* suboption end */
case 0xf1: /* NOP */
case 0xf2: /* Data Mark */
case 0xf5: /* abort output */
case 0xf7: /* erase character */
case 0xf8: /* erase line */
case 0xf9: /* go ahead */
dprintf(1,"wconsd[%i]: option IAC %i\n",conn->id,ch);
conn->telnet_option=0;
return 0; /* dont echo */

case 0xf3: /* Break */
if (conn->serialconnected) {
dprintf(2,"wconsd[%i]: send break\n",conn->id);
Sleep(1000);
SetCommBreak(conn->serial);
Sleep(1000);
ClearCommBreak(conn->serial);
}
conn->telnet_option=0;
return 0; /* dont echo */

case 0xf4: /* Interrupt */
conn->option_runmenu=1;
conn->telnet_option=0;
return 0; /* dont echo */

case 0xf6: /* are you there */
dprintf(1,"wconsd[%i]: option IAC AYT\n",conn->id);
netprintf(conn,"yes\r\n");
conn->telnet_option=0;
return 0; /* dont echo */

case TELNET_OPTION_SB:
case TELNET_OPTION_WILL:
case TELNET_OPTION_WONT:
case TELNET_OPTION_DO:
case TELNET_OPTION_DONT:
conn->telnet_option=ch;
return 0; /* dont echo */

case 0xff: /* send ff */
conn->telnet_option=0;
return ch; /* ECHO */

default:
dprintf(1,"wconsd[%i]: option IAC %i invalid\n",conn->id,ch);
conn->telnet_option=0;
return 0; /* dont echo */
}

case TELNET_OPTION_SB: /* received IAC SB 0xfa */
conn->telnet_option=TELNET_OPTION_SBXX;
conn->telnet_option_param=ch;
return 0; /* dont echo */

case TELNET_OPTION_WILL: /* received IAC WILL 0xfb */
dprintf(2,"wconsd[%i]: option IAC WILL %i\n",conn->id,ch);
conn->telnet_option=0;
return 0; /* dont echo */
case TELNET_OPTION_WONT: /* received IAC WONT 0xfc */
dprintf(1,"wconsd[%i]: option IAC WONT %i\n",conn->id,ch);
conn->telnet_option=0;
return 0; /* dont echo */
case TELNET_OPTION_DO: /* received IAC DO 0xfd */
switch (ch) {
case 0x00: /* Binary */
dprintf(2,"wconsd[%i]: DO Binary\n",conn->id);
conn->option_binary=1;
case 0x01: /* ECHO */
dprintf(2,"wconsd[%i]: DO ECHO\n",conn->id);
conn->option_echo=1;
break;
default:
dprintf(2,"wconsd[%i]: option IAC DO %i\n",conn->id,ch);
break;
}
conn->telnet_option=0;
return 0; /* dont echo */
case TELNET_OPTION_DONT: /* received IAC DONT 0xfe */
switch (ch) {
case 0x00: /* Binary */
dprintf(2,"wconsd[%i]: DONT Binary\n",conn->id);
conn->option_binary=0;
case 0x01: /* ECHO */
dprintf(1,"wconsd[%i]: DONT ECHO\n",conn->id);
conn->option_echo=0;
break;
default:
dprintf(2,"wconsd[%i]: option IAC DONT %i\n",conn->id,ch);
break;
}
conn->telnet_option=0;
return 0; /* dont echo */

default:
if (conn->telnet_option==TELNET_OPTION_SBXX) {
/* received IAC SB x */
int option = conn->telnet_option_param;

if (ch==0) {
/* IS */
dprintf(1,"wconsd[%i]: option IAC SB %i IS\n",
conn->id,option);
/*
* TODO - stay in telnet option mode while
* absorbing the IS buffer
*/
conn->telnet_option=0;
return 0; /* dont echo */
} else if (ch>1) {
/* error ? */
dprintf(1,"wconsd[%i]: option IAC SB %i %i\n",
conn->id,option,ch);
conn->telnet_option=0;
return 0; /* dont echo */
}

/* SEND */
if (option == 5) {
dprintf(1,"wconsd[%i]: option IAC SB 5 SEND\n",conn->id);
/* FIXME - add option_binary */
netprintf(conn,"%s%c%s%s%s",
"\xff\xfa\x05",
0,
"\xfb\x05",
conn->option_echo?"\xfb\x01":"",
"\xff\xf0");
conn->telnet_option=0;
return 0; /* dont echo */
} else {
/* error ? */
dprintf(1,"wconsd[%i]: option IAC SB %i %i\n",
conn->id,option,ch);
conn->telnet_option=0;
return 0; /* dont echo */
}
}

dprintf(1,"wconsd[%i]: invalid conn->telnet_option==%i \n",conn->id,conn->telnet_option);

}

/* not normally reached */
return 3;
}

/*
* Wrap up all the crazy file writing process in a function
*/
int serial_writefile(struct connection *conn,OVERLAPPED *o,unsigned char *buf,int size) {
DWORD wsize;

if (!conn->serialconnected) {
dprintf(1,"wconsd[%i]: serial_writefile but serial closed\n",conn->id);
return 0;
}

if (!WriteFile(conn->serial,buf,size,&wsize,o)) {
if (GetLastError()==ERROR_IO_PENDING) {
// Wait for it...
if (!GetOverlappedResult(conn->serial,o,&wsize,TRUE)) {
dprintf(1,"wconsd[%i]: Error %d (overlapped) writing to COM port\n",conn->id,GetLastError());
}
} else {
dprintf(1,"wconsd[%i]: Error %d writing to COM port\n",conn->id,GetLastError());
}
}
if (wsize!=size) {
dprintf(1,"wconsd[%i]: Eeek! WriteFile: wrote %d of %d\n",conn->id,wsize,size);
}
return wsize;
}

DWORD WINAPI wconsd_net_to_com(LPVOID lpParam)
{
struct connection * conn = (struct connection*)lpParam;
unsigned char buf[BUFSIZE];
unsigned char *pbuf;
int bytes_to_scan;
DWORD size;
unsigned long zero=0;
fd_set s;
struct timeval tv;
OVERLAPPED o={0};

dprintf(1,"wconsd[%i]: debug: start wconsd_net_to_com\n",conn->id);

o.hEvent = writeEvent;
while (conn->serialconnected) {
/* There's a bug in some versions of Windows which leads
* to recv() returning -1 and indicating error WSAEWOULDBLOCK,
* even on a blocking socket. This select() is here to work
* around that bug. */
/*
* These sockets are non-blocking, so I am unsure that the
* above statement is still true
*/
FD_SET(conn->net,&s);
tv.tv_sec = 2;
tv.tv_usec = 0;
select(0,&s,NULL,NULL,&tv);
/* TODO - examine the retval for the select */
size=recv(conn->net,(void*)&buf,BUFSIZE,0);
if (size==0) {
closesocket(conn->net);
conn->net=INVALID_SOCKET;
dprintf(1,"wconsd[%i]: wconsd_net_to_com size==0\n",conn->id);
return 0;
}
if (size==SOCKET_ERROR) {
int err = WSAGetLastError();
switch (err) {
case WSAEWOULDBLOCK:
/* ignore */
if (conn->option_keepalive) {
netprintf(conn,"\xff\xf1");
}
continue;
case WSAECONNRESET:
closesocket(conn->net);
conn->net=INVALID_SOCKET;
return 0;
default:
dprintf(1,"wconsd[%i]: net_to_com socket error (%i)\n",conn->id,err);
/* General paranoia about blocking sockets */
ioctlsocket(conn->net,FIONBIO,&zero);
}
continue;
}
conn->net_bytes_rx+=size;

/*
* Scan for telnet options and process then remove them
* This loop is reasonably fast if there are no options,
* but recursively slow if there are options
*
* TODO - if an option is mid packet, this could change
* the semantics of processing at the wrong point
*/
pbuf=buf;
bytes_to_scan=size;
while(bytes_to_scan--) {
/* TODO - use ->telnet_option || 0xff to chose to call process_telnet_option */
if(!process_telnet_option(conn,*pbuf)) {
/* remove this byte from the buffer */
memmove(pbuf,pbuf+1,bytes_to_scan);
size--;
continue;
}
pbuf++;
}

/*
* Scan for CR NUL sequences and uncook them
* it also appears that I need to uncook CR LF sequences
*/
if (!conn->option_binary) {
pbuf=buf;
bytes_to_scan=size;
while ((pbuf=memchr(pbuf,0x0d,bytes_to_scan))!=NULL) {
pbuf++;
if (*pbuf!=0x00&&*pbuf!=0x0a) {
continue;
}

bytes_to_scan = size-(pbuf-buf)+1;
size -= 1;
memmove(pbuf,pbuf+1,bytes_to_scan);
}
/* TODO - emulate cisco's ctrl-^,x sequence for exit to menu */
}


if (conn->option_runmenu) {
/*
* If processing the telnet options has caused
* runmenu to be set, we exit the loop here
*/
return 0;
}

if (!conn->serialconnected) {
dprintf(1,"wconsd[%i]: data to send, but serial closed\n",conn->id);
continue;
}

/*
* we could check the return value to see if there was a
* short write, but what would our options be?
*/
serial_writefile(conn,&o,buf,size);
}
dprintf(1,"wconsd[%i]: debug: finish wconsd_net_to_com\n",conn->id);
return 0;
}

DWORD WINAPI wconsd_com_to_net(LPVOID lpParam)
{
struct connection * conn = (struct connection*)lpParam;
unsigned char buf[BUFSIZE];
DWORD size;
OVERLAPPED o={0};

o.hEvent=readEvent;

dprintf(1,"wconsd[%i]: debug: start wconsd_com_to_net\n",conn->id);

while (conn->serialconnected) {
if (!ReadFile(conn->serial,buf,BUFSIZE,&size,&o)) {
if (GetLastError()==ERROR_IO_PENDING) {
// Wait for overlapped operation to complete
if (!GetOverlappedResult(conn->serial,&o,&size,TRUE)) {
dprintf(1,"wconsd: Error %d (overlapped) reading from COM port\n",GetLastError());
}
} else {
dprintf(1,"wconsd[%i]: Error %d reading from COM port\n",conn->id,GetLastError());
conn->serialconnected=0;
continue;
}
}
/* We might not have any data if the ReadFile timed out */
if (size>0) {
if (send(conn->net,(void*)&buf,size,0)==-1) {
dprintf(1,"wconsd[%i]: wconsd_com_to_net send failed\n",conn->id);
return 0;
}
conn->net_bytes_tx+=size;
}
}
dprintf(1,"wconsd[%i]: debug: finish wconsd_com_to_net\n",conn->id);
return 0;
}

void cmd_open(struct connection *conn) {
dprintf(1,"wconsd[%i]: debug: start cmd_open\n",conn->id);

if (!conn->serialconnected) {
if (open_com_port(conn)) {
netprintf(conn,"error: cannot open port\r\n\n");
return;
}
}

netprintf(conn,"\r\n\n");

PurgeComm(conn->serial,PURGE_RXCLEAR|PURGE_RXABORT);
if (conn->serialThread==NULL) {
/* we might already have a com_to_net thread */
conn->serialThread=CreateThread(NULL,0,wconsd_com_to_net,conn,0,NULL);
}

conn->option_runmenu=0;
wconsd_net_to_com(conn);
conn->option_runmenu=1;
}

void send_help(struct connection *conn) {
netprintf(conn,
"NOTE: the commands will be changing in the next version\r\n"
"\r\n"
"available commands:\r\n"
"\r\n"
"binary - toggle the binary comms mode\r\n"
"close - Stop serial communications\r\n"
"copyright - Print the copyright notice\r\n"
"data - Set number of data bits\r\n"
"help - This guff\r\n"
"kill_conn - Stop a given connection's serial communications\r\n"
"keepalive - toggle the generation of keepalive packets\r\n"
"open - Connect or resume communications with a serial port\r\n"
"parity - Set the serial parity\r\n"
"port - Set serial port number\r\n"
"quit - exit from this session\r\n"
"show_conn_table - Show the connections table\r\n"
"speed - Set serial port speed\r\n"
"status - Show current serial port status\r\n"
"stop - Set number of stop bits\r\n"
"\r\n"
"see http://wob.zot.org/2/wiki/wconsd for more information\r\n"
"\r\n");
}

void show_status(struct connection* conn) {
/* print the status to the net connection */

netprintf(conn, "status:\r\n\n"
" port=%d speed=%d data=%d parity=%d stop=%d\r\n",
com_port, com_speed, com_data, com_parity, com_stop);

if(conn->serialconnected) {
netprintf(conn, " state=open\r\n\n");
} else {
netprintf(conn, " state=closed\r\n\n");
}
netprintf(conn," connectionid=%i hostname=%s\r\n",conn->id,hostname);
netprintf(conn," echo=%i binary=%i keepalive=%i\r\n",
conn->option_echo,conn->option_binary,conn->option_keepalive);
netprintf(conn,"\r\n");
}

/*
* I thought that I would need this a lot, but it turns out that there
* was a lot of duplicated code
*/
int check_atoi(char *p,int old_value,struct connection *conn,char *error) {
if (!p) {
netprintf(conn,error);
return old_value;
}

return atoi(p);
}

void process_menu_line(struct connection*conn, char *line) {
char *command;
char *parameter1;

/*
* FIXME - non re-entrant code
*
* my windows build environment does not have strtok_r
* and thus I am running these two strtok as close as possible.
* I am definitely not going to re-invent the wheel with my own
* code.
*/
command = strtok(line," ");
parameter1 = strtok(NULL," ");

if (!strcmp(command, "help") || !strcmp(command, "?")) {
// help
send_help(conn);
} else if (!strcmp(command, "status")) {
// status
show_status(conn);
} else if (!strcmp(command, "copyright")) { // copyright
netprintf(conn,
" Copyright (c) 2008 by Hamish Coleman <hamish@zot.org>\r\n"
" 2003 by Benjamin Schweizer <gopher at h07 dot org>\r\n"
" 1998 by Stephen Early <Stephen.Early@cl.cam.ac.uk>\r\n"
"\r\n"
"\r\n"
" This program is free software; you can redistribute it and/or modify\r\n"
" it under the terms of the GNU General Public License as published by\r\n"
" the Free Software Foundation; either version 2 of the License, or\r\n"
" (at your option) any later version.\r\n"
"\r\n"
" This program is distributed in the hope that it will be useful,\r\n"
" but WITHOUT ANY WARRANTY; without even the implied warranty of\r\n"
" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r\n"
" GNU General Public License for more details.\r\n"
"\r\n"
" You should have received a copy of the GNU General Public License\r\n"
" along with this program; if not, write to the Free Software\r\n"
" Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.\r\n"
"\n");
} else if (!strcmp(command, "port")) { // port
int new = check_atoi(parameter1,com_port,conn,"must specify a port\r\n");

if (new >= 1 && new <= 16) {
com_port=new;
}
} else if (!strcmp(command, "speed")) { // speed
com_speed = check_atoi(parameter1,com_port,conn,"must specify a speed\r\n");
} else if (!strcmp(command, "data")) { // data
if (!parameter1) {
netprintf(conn,"Please specify number of data bits {5,6,7,8}\r\n");
return;
}
if (!strcmp(parameter1, "5")) {
com_data=5;
} else if (!strcmp(parameter1, "6")) {
com_data=6;
} else if (!strcmp(parameter1, "7")) {
com_data=7;
} else if (!strcmp(parameter1, "8")) {
com_data=8;
}
show_status(conn);
} else if (!strcmp(command, "parity")) { // parity
if (!parameter1) {
netprintf(conn,"Please specify the parity {no,even,odd,mark,space}\r\n");
return;
}
if (!strcmp(parameter1, "no") || !strcmp(parameter1, "0")) {
com_parity=NOPARITY;
} else if (!strcmp(parameter1, "even") || !strcmp(parameter1, "2")) {
com_parity=EVENPARITY;
} else if (!strcmp(parameter1, "odd") || !strcmp(parameter1, "1")) {
com_parity=ODDPARITY;
} else if (!strcmp(parameter1, "mark")) {
com_parity=MARKPARITY;
} else if (!strcmp(parameter1, "space")) {
com_parity=SPACEPARITY;
}
show_status(conn);
} else if (!strcmp(command, "stop")) {
if (!parameter1) {
netprintf(conn,"Please specify the number of stop bits {1,1.5,2}\r\n");
return;
}
if (!strcmp(parameter1, "one") || !strcmp(parameter1, "1")) {
com_stop=ONESTOPBIT;
} else if (!strcmp(parameter1, "one5") || !strcmp(parameter1, "1.5")) {
com_stop=ONE5STOPBITS;
} else if (!strcmp(parameter1, "two") || !strcmp(parameter1, "2")) {
com_stop=TWOSTOPBITS;
}
show_status(conn);
} else if (!strcmp(command, "open")) { // open
int new = check_atoi(parameter1,com_port,conn,"Opening default port\r\n");

if (new >= 1 && new <= 16) {
com_port=new;
}
cmd_open(conn);
} else if (!strcmp(command, "close")) { // close
close_serial_connection(conn);
netprintf(conn,"info: actual com port closed\r\n\n");
} else if (!strcmp(command, "quit")) {
// quit the connection
conn->option_runmenu=0;
closesocket(conn->net);
conn->net=INVALID_SOCKET;
return;
} else if (!strcmp(command, "keepalive")) {
conn->option_keepalive=!conn->option_keepalive;
return;
} else if (!strcmp(command, "binary")) {
conn->option_binary=!conn->option_binary;
return;
} else if (!strcmp(command, "show_conn_table")) {
int i;
netprintf(conn,
"Flags: A - Active Slot, S - Serial active,\r\n"
" M - Run Menu, B - Binary transmission, E - Echo enabled,\r\n"
" K - Telnet Keepalives, * - This connection\r\n"
"\r\n");
netprintf(conn,
"s flags id mThr net serial serialTh netrx nettx peer address\r\n");
netprintf(conn,
"- ------ -- ---- ---- ------ -------- ----- ----- ------------\r\n");
for (i=0;i<MAXCONNECTIONS;i++) {
netprintf(conn,"%i%c%c%c%c%c%c%c %2i %4i ",
i,
&connection[i]==conn?'*':' ',
connection[i].active?'A':' ',
connection[i].serialconnected?'S':' ',
connection[i].option_runmenu?'M':' ',
connection[i].option_binary?'B':' ',
connection[i].option_echo?'E':' ',
connection[i].option_keepalive?'K':' ',
connection[i].id,

connection[i].menuThread);
netprintf(conn,"%4i ", connection[i].net);

if (connection[i].serialconnected) {
netprintf(conn,"%6i %8i ",
connection[i].serial,
connection[i].serialThread);
} else {
netprintf(conn," ");
}
netprintf(conn, "%5i %5i ",
connection[i].net_bytes_rx,
connection[i].net_bytes_tx);
if (connection[i].sa) {
/* FIXME - IPv4 Specific */
netprintf(conn,"%s:%i",
inet_ntoa(((struct sockaddr_in*)connection[i].sa)->sin_addr),
htons(((struct sockaddr_in*)connection[i].sa)->sin_port));
}
netprintf(conn, "\r\n");
}
} else if (!strcmp(command, "kill_conn")) {
int connid = check_atoi(parameter1,0,conn,"must specify a connection id\r\n");
if (connid==0 || connid>next_connection_id) {
netprintf(conn,"Connection ID %i out of range\r\n",connid);
return;
}

int i=0;
while(connection[i].id!=connid && i<MAXCONNECTIONS) {
i++;
}
if (i>=MAXCONNECTIONS) {
netprintf(conn,"Connection ID %i not found\r\n",connid);
return;
}
netprintf(&connection[i],"Serial Connection Closed by Connection ID %i\r\n",conn->id);
close_serial_connection(&connection[i]);
netprintf(conn,"Connection ID %i serial port closed\r\n",connid);
} else if (!strcmp(command, "menu")) {
cli_loop(cli,conn->net);
} else {
/* other, unknown commands */
netprintf(conn,"\r\nInvalid Command: '%s'\r\n\r\n",line);
}
}

void show_prompt(struct connection *conn) {
netprintf(conn,"%s> ",hostname);
}

void run_menu(struct connection * conn) {
unsigned char buf[BUFSIZE+5]; /* ensure there is room for our kludge telnet options */
unsigned char line[MAXLEN];
DWORD size, linelen=0;
WORD i;

unsigned long zero=0;
fd_set set_read;
struct timeval tv;

unsigned char last_ch;
unsigned char ch;

/* IAC WILL ECHO */
/* IAC WILL suppress go ahead */
/* IAC WILL status */
/* IAC WONT linemode */
netprintf(conn,"\xff\xfb\x01\xff\xfb\x03\xff\xfb\x05\xff\xfc\x22");

netprintf(conn,"\r\nwconsd serial port server (version %s)\r\n\r\n",VERSION);
send_help(conn);
show_prompt(conn);

FD_ZERO(&set_read);
while (conn->option_runmenu) {
FD_SET(conn->net,&set_read);
tv.tv_sec = 2;
tv.tv_usec = 0;
select(conn->net+1,&set_read,NULL,NULL,&tv);
/* TODO - examine the retval for the select */
size=recv(conn->net,(void*)&buf,BUFSIZE,0);

if (size==0) {
closesocket(conn->net);
conn->net=INVALID_SOCKET;
return;
}
if (size==SOCKET_ERROR) {
int err = WSAGetLastError();
switch (err) {
case WSAEWOULDBLOCK:
/* ignore */
if (conn->option_keepalive) {
netprintf(conn,"\xff\xf1");
}
continue;
case WSAECONNRESET:
closesocket(conn->net);
conn->net=INVALID_SOCKET;
return;
default:
dprintf(1,"wconsd[%i]: run_menu socket error (%i)\n",conn->id,WSAGetLastError());
/* General paranoia about blocking sockets */
ioctlsocket(conn->net,FIONBIO,&zero);
}
continue;
}
conn->net_bytes_rx+=size;

for (i = 0; i < size; i++) {
last_ch=ch;
ch = buf[i];

/* TODO - remove the second call to process_telnet_option */
if (conn->telnet_option) {
/* We are in the middle of handling an option */
process_telnet_option(conn,ch);
/*
* return value ignored, since we dont care to
* print any telnet option values in the menu.
*/
continue;
}
if (ch==0) {
/*
* NULLs could occur as the second char in a
* CR NUL telnet sequence
*/
continue;
} else if (ch==127 || ch==8) {
// backspace
if (linelen > 0) {
netprintf(conn,"\x08 \x08");
linelen--;
} else {
/* if the linebuf is empty, ring the bell */
netprintf(conn,"\x07");
}
continue;
} else if (ch==0x0d || ch==0x0a) {
// detected cr or lf

if (last_ch == 0x0d && ch==0x0a) {
/* skip the second char in CR LF */
continue;
}

if (conn->option_echo)
/* echo the endofline */
netprintf(conn,"\r\n");

if (linelen!=0) {
line[linelen]=0; // ensure string is terminated

process_menu_line(conn,(char*)line);
if (!conn->option_runmenu) {
/* exiting the menu.. */
return;
}
}

show_prompt(conn);
linelen=0;
continue;
} else if (ch<0x20) {
/* ignore other ctrl chars */
continue;
} else if (ch==TELNET_OPTION_IAC) {
/* start a telnet option packet */
process_telnet_option(conn,ch);
/*
* no possible return values, since IAC is
* just the beginning of a telnet packet
*/
continue;
} else {
// other chars

if (linelen < MAXLEN - 1) {
line[linelen] = ch;
linelen++;
if (conn->option_echo) {
netprintf(conn,"%c",ch); /* echo */
}
} else {
netprintf(conn,"\x07"); /* linebuf full bell */
}
continue;
}
}
}

/* not reached */
}

DWORD WINAPI thread_new_connection(LPVOID lpParam) {
struct connection * conn = (struct connection*)lpParam;

dprintf(1,"wconsd[%i]: debug: start thread_new_connection loop\n",conn->id);
run_menu(conn);

/* cleanup */
dprintf(1,"wconsd[%i]: connection closing\n",conn->id);

/* TODO print bytecounts */
/* maybe close file descriptors? */
shutdown(conn->net,SD_BOTH);
closesocket(conn->net);

close_serial_connection(conn);

conn->active=0;

/* TODO - who closes menuThread ? */
return 0;
}

int wconsd_main(int param1)
{
HANDLE wait_array[2];
BOOL run=TRUE;
DWORD o;
SOCKET as;
unsigned long zero=0;

struct sockaddr_in sa;
int salen;

int i;
int count;

/* clear out any bogus data in the connections table */
for (i=0;i<MAXCONNECTIONS;i++) {
connection[i].active = 0;
}

/* Main loop: wait for a connection, service it, repeat
* until signalled that the service is terminating */
wait_array[0]=stopEvent;
wait_array[1]=listenSocketEvent;

while (run) {
dprintf(1,"wconsd: debug: start wconsd_main loop\n");

o=WaitForMultipleObjects(2,wait_array,FALSE,INFINITE);

switch (o-WAIT_OBJECT_0) {
case 0: /* stopEvent */
run=FALSE;
ResetEvent(stopEvent);
break;
case 1: /* listenSocketEvent */
/* There is an incoming connection */
WSAResetEvent(listenSocketEvent);
salen = sizeof(sa);
as=accept(ls,(struct sockaddr*)&sa,&salen);

if (as==INVALID_SOCKET) {
break;
}

dprintf(1,"wconsd: new connection from %s\n",
inet_ntoa(sa.sin_addr));

/* search for an empty connection slot */
i=next_connection_slot%MAXCONNECTIONS;
count=0;
while(connection[i].active && count<MAXCONNECTIONS) {
count++;
i = (i+1)%MAXCONNECTIONS;
}
if (i==MAXCONNECTIONS) {
dprintf(1,"wconsd: connection table overflow\n");
/* FIXME - properly reject the incoming connection */
/* for now, just close the socket */
closesocket(as);
break;
}
next_connection_slot = (next_connection_slot+1)%MAXCONNECTIONS;
connection[i].active=1; /* mark this entry busy */
connection[i].id = next_connection_id++;
connection[i].menuThread=NULL;
connection[i].net=as;
connection[i].serialconnected=0;
connection[i].serial=INVALID_HANDLE_VALUE;
connection[i].serialThread=NULL;
connection[i].option_runmenu=1; /* start in the menu */
connection[i].option_binary=0;
connection[i].option_echo=0;
connection[i].option_keepalive=0;
connection[i].net_bytes_rx=0;
connection[i].net_bytes_tx=0;
connection[i].telnet_option=0;
connection[i].telnet_option_param=0;

if (connection[i].sa) {
/* Do lazy de-allocation so that the info is
* still visible to show conn table */
free(connection[i].sa);
}
if ((connection[i].sa=malloc(salen))==NULL) {
dprintf(1,"wconsd[%i]: malloc failed\n",
connection[i].id);
} else {
memcpy(connection[i].sa,&sa,salen);
}

dprintf(1,"wconsd[%i]: accepted new connection in slot %i\n",connection[i].id,i);


/* we successfully accepted the connection */

ioctlsocket(connection[i].net,FIONBIO,&zero);

connection[i].menuThread = CreateThread(NULL,0,thread_new_connection,&connection[i],0,NULL);

break;
default:
run=FALSE; // Stop the service - I want to get off!
break;
}
}

/* TODO - look through the connection table and close everything */

closesocket(ls);
WSACleanup();
return 0;
}

int main(int argc, char **argv)
{
// debug info for when I test this as a service
dprintf(1,"wconsd: started with argc==%i\n",argc);

if (argc==1 || argc==0) {

// assume that our messages are going to the debug log
dprintf_to_stdout=0;

if (SCM_Start(&sd)!=SVC_CONSOLE) {
return 0;
}

// fall through and try running as a command-line application
}

// We are running in debug mode (or any other command-line mode)
dprintf_to_stdout=1;

dprintf(1,"\n"
"wconsd: Serial Console server (version %s)\n",VERSION);
dprintf(1,
" (see http://wob.zot.org/2/wiki/wconsd for more info)\n\n");

/* we are running as a console app so simulate the SCM */
/* TODO - this could all be done inside the *-scm.c code */
int r=wconsd_init(argc,argv);
if (r!=0) {
dprintf(1,"wconsd: wconsd_init failed, return code %d\n",r);
return 1;
}

dprintf(1,"wconsd: Foreground mode\n");
wconsd_main(0);

return 0;
}

(11-11/12)