?? telnet.c
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/* Telnet utility for 'TCP/IP Lean' (c) Iosoft Ltd. 2000
This software is only licensed for distribution with the book 'TCP/IP Lean',
and may only be used for personal experimentation by the purchaser
of that book, on condition that this copyright notice is retained.
For commercial licensing, contact license@iosoft.co.uk
This is experimental software; use it entirely at your own risk. The author
offers no warranties of any kind, including its fitness for purpose. */
/*
** v0.01 JPB 27/1/00
** v0.02 JPB 28/1/00 First steps toward TCP implementation
** v0.03 JPB 31/1/00 Added timeout
** v0.04 JPB 1/2/00 Added duplicate segment handling
** v0.05 JPB 2/2/00 Added TCP upcall, and active close
** v0.06 JPB 3/2/00 Simplified socket closure
** v0.07 JPB 4/2/00 Simplified state machine
** v0.08 JPB 4/2/00 Split upcalls into client & server
** v0.09 JPB 7/2/00 Improved active close
** v0.10 JPB 1/3/00 Fixed 'gate_ip' problem when no gateway specified
** Fixed problem with SLIP node matching
** v0.11 JPB 1/3/00 changed command-line interface to include port names
** v0.12 JPB 20/3/00 Added LiteLink and modem support
** v0.13 JPB 23/3/00 Used upcall pointers in TCP.C
** v0.14 JPB 6/4/00 Replaced 'strcmpi' with 'stricmp' for DJGPP compatibility
** v0.15 JPB 21/4/00 Fixed TCP problem receiving FIN + data
** v0.16 JPB 5/5/00 Minor cosmetic improvements to TCP code
** v0.17 JPB 3/7/00 Changed default config file to TCPLEAN.CFG
** Revised header for book CD
*/
#define VERSION "0.17"
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
#include <signal.h>
#include <time.h>
#include "ether.h"
#include "netutil.h"
#include "net.h"
#include "ip.h"
#include "tcp.h"
#define CFGFILE "tcplean.cfg" /* Default config filename */
#define CFGEXT ".cfg" /* Default config extension */
#define MAXNETCFG 40 /* Max length of a net config string */
#define DEFPORT TELPORT /* Default port number */
/* Test page for Web server */
#define MYPAGE "HTTP/1.0 200 OK\r\n\r\n\
<html><body>Test page from telnet server v" VERSION "</body></html>"
GENFRAME genframe; /* Frame for network Tx/Rx */
char cfgfile[MAXPATH+5]=CFGFILE; /* Config filename */
char netcfg[MAXNETCFG+1]="??"; /* Network config string */
extern BYTE bcast[MACLEN]; /* Broadcast Ethernet addr */
NODE locnode; /* My Ethernet and IP addresses */
int breakflag; /* Flag to indicate ctrl-break pressed */
char *clientcmd; /* Pointer to command-line command */
/* Debug flags */
extern int netdebug; /* Verbose packet display */
extern int tcpdebug; /* TCP frame display */
extern int statedebug; /* TCP state display */
/* Socket storage */
#define NSOCKS 2
TSOCK tsocks[NSOCKS] = /* Initialise index num and buffer sizes */
{
{1,{_CBUFFLEN_},{_CBUFFLEN_}}, {2,{_CBUFFLEN_},{_CBUFFLEN_}}
};
/* Telnet options */
BYTE telopts[] =
{
TEL_IAC, TEL_DO, TEL_SGA, /* Do suppress go-ahead */
TEL_IAC, TEL_WONT, TEL_ECHO, /* Won't echo */
TEL_IAC, TEL_WONT, TEL_AUTH /* Won't authenticate */
};
/* Function pointers: upcalls from TCP/IP stack */
extern NODE *(*get_locnode_n)(int n); /* Get local node */
extern int (*server_upcall)(TSOCK *ts, CONN_STATE conn);/* TCP server action */
extern int (*client_upcall)(TSOCK *ts, CONN_STATE conn);/* TCP client action */
/* Prototypes */
WORD read_netconfig(char *fname, NODE *np);
NODE *locnode_n(int n);
int server_action(TSOCK *ts, CONN_STATE conn);
int client_action(TSOCK *ts, CONN_STATE conn);
void do_teldisp(TSOCK *ts);
void do_receive(GENFRAME *gfp);
void do_poll(GENFRAME *gfp);
WORD str2service(char *str);
void disp_usage(void);
void break_handler(int sig);
int main(int argc, char *argv[])
{
int args=0, err=0, client=0, fail, n;
char *p, temps[18], k=0, c;
WORD dtype;
GENFRAME *gfp;
LWORD mstimer;
TSOCK *ts;
NODE rem;
printf("TELNET v" VERSION "\n"); /* Sign on */
get_locnode_n = locnode_n; /* Set upcall ptrs to funcs */
server_upcall = server_action;
client_upcall = client_action;
signal(SIGINT, break_handler); /* Trap ctrl-C */
ts = &tsocks[0]; /* Pointer to client socket */
memset(&rem, 0, sizeof(rem)); /* Preset remote port number */
rem.port = DEFPORT;
while (argc > ++args) /* Process command-line args */
{
if ((c=argv[args][0])=='-' || c=='/')
{
switch (toupper(argv[args][1]))
{
case 'C': /* -C: config filename */
strncpy(cfgfile, argv[++args], MAXPATH);
if ((p=strrchr(cfgfile, '.'))==0 || !isalpha(*(p+1)))
strcat(cfgfile, CFGEXT);
break;
case 'S': /* -S: display TCP states */
statedebug = 1;
break;
case 'T': /* -T: display TCP segments */
tcpdebug = 1;
break;
case 'V': /* -V: verbose packet display */
netdebug |= 1;
break;
case 'X': /* -X: hex packet display */
netdebug |= 2;
break;
default:
err = 1;
}
}
else if (client==0 && isdigit(c)) /* If client mode.. */
{
rem.ip = atoip(argv[args]); /* Get destination IP address */
client++;
} /* ..then port num/name */
else if (client==1 && (rem.port=str2service(argv[args]))!=0)
client++;
else if (client == 2)
{
clientcmd = argv[args]; /* ..then command string */
client++;
}
}
if (err || rem.port==0) /* Prompt user if error */
disp_usage();
else if (!(dtype=read_netconfig(cfgfile, &locnode)))
printf("Invalid configuration '%s'\n", cfgfile);
else
{
rem.dtype = genframe.g.dtype = dtype; /* Set frame driver type */
gfp = &genframe; /* Get pointer to frame */
printf("IP %s", ipstr(locnode.ip, temps));
printf(" mask %s", ipstr(locnode.mask, temps));
if (locnode.gate)
printf(" gate %s", ipstr(locnode.gate, temps));
if (dtype & DTYPE_ETHER)
printf(" Ethernet %s", ethstr(locnode.mac, temps));
if (client && !on_subnet(rem.ip, &locnode) && !locnode.gate)
printf("\nWARNING: no gateway specified!");
printf("\nPress ESC or ctrl-C to exit\n\n");
if (client) /* If client, open socket */
open_tcp(ts, gfp, &locnode, &rem);
while (!breakflag && k!=0x1b) /* Main loop.. */
{
do_receive(gfp); /* Receive frames */
do_poll(gfp); /* Poll net drivers */
if (client)
{
do_teldisp(ts); /* Telnet client display */
if (!ts->state) /* If closed */
breakflag = 1; /* ..exit from main loop */
else if (k) /* If key pressed.. */
buff_in(&ts->txb, (BYTE *)&k, 1);
k = 0; /* ..send it */
}
if (kbhit()) /* Get keypress */
k = getch();
} /* Close connection */
if (k)
printf("Closing...\n");
mstimeout(&mstimer, 0); /* Refresh timer */
do
{ /* Loop until conns closed */
for (n=fail=0; n<NSOCKS; n++)
fail += !close_tcp(&tsocks[n]);
do_receive(gfp);
do_poll(gfp); /* ..or timeout */
} while (!mstimeout(&mstimer, 1000) && fail);
if (fail) /* If still open.. */
{
printf("Resetting connections\n");
for (n=0; n<NSOCKS; n++) /* ..send reset */
reset_tcp(&tsocks[n], gfp);
while (!mstimeout(&mstimer, 1000))
{ /* ..and wait until sent */
do_receive(gfp);
do_poll(gfp);
}
}
close_net(dtype); /* Shut down net driver */
}
return(0);
}
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