Пример #1
0
static void put_iac_subopt_autologin(void)
{
	int len = strlen(G.autologin) + 6;	// (2 + 1 + 1 + strlen + 2)
	const char *p = "USER";

	if (G.iaclen + len > IACBUFSIZE)
		iac_flush();

	put_iac(IAC);
	put_iac(SB);
	put_iac(TELOPT_NEW_ENVIRON);
	put_iac(TELQUAL_IS);
	put_iac(NEW_ENV_VAR);

	while (*p)
		put_iac(*p++);

	put_iac(NEW_ENV_VALUE);

	p = G.autologin;
	while (*p)
		put_iac(*p++);

	put_iac(IAC);
	put_iac(SE);
}
Пример #2
0
static void put_iac2(byte wwdd, byte c)
{
	if (G.iaclen + 3 > IACBUFSIZE)
		iac_flush();

	put_iac(IAC);
	put_iac(wwdd);
	put_iac(c);
}
Пример #3
0
static void do_linemode(void)
{
	G.charmode = CHM_TRY;
	G.telflags &= ~(UF_ECHO | UF_SGA);
	setConMode();

	put_iac2(DONT, TELOPT_ECHO);
	put_iac2(DONT, TELOPT_SGA);
	iac_flush();
}
Пример #4
0
static void will_charmode(void)
{
	G.charmode = CHM_TRY;
	G.telflags |= (UF_ECHO | UF_SGA);
	setConMode();

	put_iac2(DO, TELOPT_ECHO);
	put_iac2(DO, TELOPT_SGA);
	iac_flush();
}
Пример #5
0
static void put_iac_naws(byte c, int x, int y)
{
	if (G.iaclen + 9 > IACBUFSIZE)
		iac_flush();

	put_iac(IAC);
	put_iac(SB);
	put_iac(c);

	put_iac((x >> 8) & 0xff);
	put_iac(x & 0xff);
	put_iac((y >> 8) & 0xff);
	put_iac(y & 0xff);

	put_iac(IAC);
	put_iac(SE);
}
Пример #6
0
static void put_iac_subopt(byte c, char *str)
{
	int len = strlen(str) + 6;   // ( 2 + 1 + 1 + strlen + 2 )

	if (G.iaclen + len > IACBUFSIZE)
		iac_flush();

	put_iac(IAC);
	put_iac(SB);
	put_iac(c);
	put_iac(0);

	while (*str)
		put_iac(*str++);

	put_iac(IAC);
	put_iac(SE);
}
Пример #7
0
static void put_iac_naws(byte c, int x, int y)
{
	if (G.iaclen + 9 > IACBUFSIZE)
		iac_flush();

	put_iac(IAC);
	put_iac(SB);
	put_iac(c);

	/* "... & 0xff" implicitly done below */
	put_iac(x >> 8);
	put_iac(x);
	put_iac(y >> 8);
	put_iac(y);

	put_iac(IAC);
	put_iac(SE);
}
Пример #8
0
static void handle_net_input(int len)
{
	int i;
	int cstart = 0;

	for (i = 0; i < len; i++) {
		byte c = G.buf[i];

		if (G.telstate == 0) { /* most of the time state == 0 */
			if (c == IAC) {
				cstart = i;
				G.telstate = TS_IAC;
			}
			continue;
		}
		switch (G.telstate) {
		case TS_0:
			if (c == IAC)
				G.telstate = TS_IAC;
			else
				G.buf[cstart++] = c;
			break;

		case TS_IAC:
			if (c == IAC) { /* IAC IAC -> 0xFF */
				G.buf[cstart++] = c;
				G.telstate = TS_0;
				break;
			}
			/* else */
			switch (c) {
			case SB:
				G.telstate = TS_SUB1;
				break;
			case DO:
			case DONT:
			case WILL:
			case WONT:
				G.telwish =  c;
				G.telstate = TS_OPT;
				break;
			default:
				G.telstate = TS_0;	/* DATA MARK must be added later */
			}
			break;
		case TS_OPT: /* WILL, WONT, DO, DONT */
			telopt(c);
			G.telstate = TS_0;
			break;
		case TS_SUB1: /* Subnegotiation */
		case TS_SUB2: /* Subnegotiation */
			if (subneg(c))
				G.telstate = TS_0;
			break;
		}
	}
	if (G.telstate) {
		if (G.iaclen)
			iac_flush();
		if (G.telstate == TS_0)
			G.telstate = 0;
		len = cstart;
	}

	if (len)
		write(STDOUT_FILENO, G.buf, len);
}
Пример #9
0
static void handle_net_input(int len)
{
	int i;
	int cstart = 0;

	for (i = 0; i < len; i++) {
		byte c = G.buf[i];

		if (G.telstate == TS_NORMAL) { /* most typical state */
			if (c == IAC) {
				cstart = i;
				G.telstate = TS_IAC;
			}
			else if (c == '\r') {
				cstart = i + 1;
				G.telstate = TS_CR;
			}
			/* No IACs were seen so far, no need to copy
			 * bytes within G.buf: */
			continue;
		}

		switch (G.telstate) {
		case TS_CR:
			/* Prev char was CR. If cur one is NUL, ignore it.
			 * See RFC 1123 section 3.3.1 for discussion of telnet EOL handling.
			 */
			G.telstate = TS_COPY;
			if (c == '\0')
				break;
			/* else: fall through - need to handle CR IAC ... properly */

		case TS_COPY: /* Prev char was ordinary */
			/* Similar to NORMAL, but in TS_COPY we need to copy bytes */
			if (c == IAC)
				G.telstate = TS_IAC;
			else
				G.buf[cstart++] = c;
			if (c == '\r')
				G.telstate = TS_CR;
			break;

		case TS_IAC: /* Prev char was IAC */
			if (c == IAC) { /* IAC IAC -> one IAC */
				G.buf[cstart++] = c;
				G.telstate = TS_COPY;
				break;
			}
			/* else */
			switch (c) {
			case SB:
				G.telstate = TS_SUB1;
				break;
			case DO:
			case DONT:
			case WILL:
			case WONT:
				G.telwish = c;
				G.telstate = TS_OPT;
				break;
			/* DATA MARK must be added later */
			default:
				G.telstate = TS_COPY;
			}
			break;

		case TS_OPT: /* Prev chars were IAC WILL/WONT/DO/DONT */
			telopt(c);
			G.telstate = TS_COPY;
			break;

		case TS_SUB1: /* Subnegotiation */
		case TS_SUB2: /* Subnegotiation */
			subneg(c); /* can change G.telstate */
			break;
		}
	}

	if (G.telstate != TS_NORMAL) {
		/* We had some IACs, or CR */
		if (G.iaclen)
			iac_flush();
		if (G.telstate == TS_COPY) /* we aren't in the middle of IAC */
			G.telstate = TS_NORMAL;
		len = cstart;
	}

	if (len)
		full_write(STDOUT_FILENO, G.buf, len);
}