utilities.cc

这是关于远程登陆TELNET 的源代码 已经测试过的。

	    case 1:
		fprintf(NetTrace, " ON"); break;
	    default:
		fprintf(NetTrace, " %d (unknown)", pointer[1]);
	    }
	    for (i = 2; i < length; i++)
		fprintf(NetTrace, " ?%d?", pointer[i]);
	    break;

	case TELOPT_NAWS:
	    fprintf(NetTrace, "NAWS");
	    if (length < 2) {
		fprintf(NetTrace, " (empty suboption???)");
		break;
	    }
	    if (length == 2) {
		fprintf(NetTrace, " ?%d?", pointer[1]);
		break;
	    }
	    fprintf(NetTrace, " %d %d (%d)",
		pointer[1], pointer[2],
		(int)((((unsigned int)pointer[1])<<8)|((unsigned int)pointer[2])));
	    if (length == 4) {
		fprintf(NetTrace, " ?%d?", pointer[3]);
		break;
	    }
	    fprintf(NetTrace, " %d %d (%d)",
		pointer[3], pointer[4],
		(int)((((unsigned int)pointer[3])<<8)|((unsigned int)pointer[4])));
	    for (i = 5; i < length; i++)
		fprintf(NetTrace, " ?%d?", pointer[i]);
	    break;

	case TELOPT_LINEMODE:
	    fprintf(NetTrace, "LINEMODE ");
	    if (length < 2) {
		fprintf(NetTrace, " (empty suboption???)");
		break;
	    }
	    switch ((unsigned char)(pointer[1])) {
	    case WILL:
		fprintf(NetTrace, "WILL ");
		goto common;
	    case WONT:
		fprintf(NetTrace, "WONT ");
		goto common;
	    case DO:
		fprintf(NetTrace, "DO ");
		goto common;
	    case DONT:
		fprintf(NetTrace, "DONT ");
	    common:
		if (length < 3) {
		    fprintf(NetTrace, "(no option???)");
		    break;
		}
		switch ((unsigned char)(pointer[2])) {
		case LM_FORWARDMASK:
		    fprintf(NetTrace, "Forward Mask");
		    for (i = 3; i < length; i++)
			fprintf(NetTrace, " %x", pointer[i]);
		    break;
		default:
		    fprintf(NetTrace, "%d (unknown)", pointer[2]);
		    for (i = 3; i < length; i++)
			fprintf(NetTrace, " %d", pointer[i]);
		    break;
		}
		break;
		
	    case LM_SLC:
		fprintf(NetTrace, "SLC");
		for (i = 2; i < length - 2; i += 3) {
		    if (SLC_NAME_OK(pointer[i+SLC_FUNC]))
			fprintf(NetTrace, " %s", SLC_NAME(pointer[i+SLC_FUNC]));
		    else
			fprintf(NetTrace, " %d", pointer[i+SLC_FUNC]);
		    switch (pointer[i+SLC_FLAGS]&SLC_LEVELBITS) {
		    case SLC_NOSUPPORT:
			fprintf(NetTrace, " NOSUPPORT"); break;
		    case SLC_CANTCHANGE:
			fprintf(NetTrace, " CANTCHANGE"); break;
		    case SLC_VARIABLE:
			fprintf(NetTrace, " VARIABLE"); break;
		    case SLC_DEFAULT:
			fprintf(NetTrace, " DEFAULT"); break;
		    }
		    fprintf(NetTrace, "%s%s%s",
			pointer[i+SLC_FLAGS]&SLC_ACK ? "|ACK" : "",
			pointer[i+SLC_FLAGS]&SLC_FLUSHIN ? "|FLUSHIN" : "",
			pointer[i+SLC_FLAGS]&SLC_FLUSHOUT ? "|FLUSHOUT" : "");
		    if (pointer[i+SLC_FLAGS]& ~(SLC_ACK|SLC_FLUSHIN|
						SLC_FLUSHOUT| SLC_LEVELBITS))
			fprintf(NetTrace, "(0x%x)", pointer[i+SLC_FLAGS]);
		    fprintf(NetTrace, " %d;", pointer[i+SLC_VALUE]);
		    if ((pointer[i+SLC_VALUE] == IAC) &&
			(pointer[i+SLC_VALUE+1] == IAC))
				i++;
		}
		for (; i < length; i++)
		    fprintf(NetTrace, " ?%d?", pointer[i]);
		break;

	    case LM_MODE:
		fprintf(NetTrace, "MODE ");
		if (length < 3) {
		    fprintf(NetTrace, "(no mode???)");
		    break;
		}
		{
		    char tbuf[64];
		    snprintf(tbuf, sizeof(tbuf), "%s%s%s%s%s",
			pointer[2]&MODE_EDIT ? "|EDIT" : "",
			pointer[2]&MODE_TRAPSIG ? "|TRAPSIG" : "",
			pointer[2]&MODE_SOFT_TAB ? "|SOFT_TAB" : "",
			pointer[2]&MODE_LIT_ECHO ? "|LIT_ECHO" : "",
			pointer[2]&MODE_ACK ? "|ACK" : "");
		    fprintf(NetTrace, "%s", tbuf[1] ? &tbuf[1] : "0");
		}
		if (pointer[2]&~(MODE_MASK))
		    fprintf(NetTrace, " (0x%x)", pointer[2]);
		for (i = 3; i < length; i++)
		    fprintf(NetTrace, " ?0x%x?", pointer[i]);
		break;
	    default:
		fprintf(NetTrace, "%d (unknown)", pointer[1]);
		for (i = 2; i < length; i++)
		    fprintf(NetTrace, " %d", pointer[i]);
	    }
	    break;

	case TELOPT_STATUS: {
	    const char *cp;
	    int j, k;

	    fprintf(NetTrace, "STATUS");

	    switch (pointer[1]) {
	    default:
		if (pointer[1] == TELQUAL_SEND)
		    fprintf(NetTrace, " SEND");
		else
		    fprintf(NetTrace, " %d (unknown)", pointer[1]);
		for (i = 2; i < length; i++)
		    fprintf(NetTrace, " ?%d?", pointer[i]);
		break;
	    case TELQUAL_IS:
		if (--want_status_response < 0)
		    want_status_response = 0;
		if (NetTrace == stdout)
		    fprintf(NetTrace, " IS\r\n");
		else
		    fprintf(NetTrace, " IS\n");

		for (i = 2; i < length; i++) {
		    switch((unsigned char)(pointer[i])) {
		    case DO:	cp = "DO"; goto common2;
		    case DONT:	cp = "DONT"; goto common2;
		    case WILL:	cp = "WILL"; goto common2;
		    case WONT:	cp = "WONT"; goto common2;
		    common2:
			i++;
			if (TELOPT_OK((int)pointer[i]))
			    fprintf(NetTrace, " %s %s", cp, TELOPT(pointer[i]));
			else
			    fprintf(NetTrace, " %s %d", cp, pointer[i]);

			if (NetTrace == stdout)
			    fprintf(NetTrace, "\r\n");
			else
			    fprintf(NetTrace, "\n");
			break;

		    case SB:
			fprintf(NetTrace, " SB ");
			i++;
			j = k = i;
			while (j < length) {
			    if (pointer[j] == SE) {
				if (j+1 == length)
				    break;
				if (pointer[j+1] == SE)
				    j++;
				else
				    break;
			    }
			    pointer[k++] = pointer[j++];
			}
			printsub(0, &pointer[i], k - i);
			if (i < length) {
			    fprintf(NetTrace, " SE");
			    i = j;
			} else
			    i = j - 1;

			if (NetTrace == stdout)
			    fprintf(NetTrace, "\r\n");
			else
			    fprintf(NetTrace, "\n");

			break;
				
		    default:
			fprintf(NetTrace, " %d", pointer[i]);
			break;
		    }
		}
		break;
	    }
	    break;
	  }

	case TELOPT_XDISPLOC:
	    fprintf(NetTrace, "X-DISPLAY-LOCATION ");
	    switch (pointer[1]) {
	    case TELQUAL_IS:
		fprintf(NetTrace, "IS \"%.*s\"", length-2, (char *)pointer+2);
		break;
	    case TELQUAL_SEND:
		fprintf(NetTrace, "SEND");
		break;
	    default:
		fprintf(NetTrace, "- unknown qualifier %d (0x%x).",
				pointer[1], pointer[1]);
	    }
	    break;

	case TELOPT_ENVIRON:
	    fprintf(NetTrace, "ENVIRON ");
	    switch (pointer[1]) {
	    case TELQUAL_IS:
		fprintf(NetTrace, "IS ");
		goto env_common;
	    case TELQUAL_SEND:
		fprintf(NetTrace, "SEND ");
		goto env_common;
	    case TELQUAL_INFO:
		fprintf(NetTrace, "INFO ");
	    env_common:
		{
		    register int noquote = 2;
		    for (i = 2; i < length; i++ ) {
			switch (pointer[i]) {
			case ENV_VAR:
			    if (pointer[1] == TELQUAL_SEND)
				goto def_case;
			    fprintf(NetTrace, "\" VAR " + noquote);
			    noquote = 2;
			    break;

			case ENV_VALUE:
			    fprintf(NetTrace, "\" VALUE " + noquote);
			    noquote = 2;
			    break;

			case ENV_ESC:
			    fprintf(NetTrace, "\" ESC " + noquote);
			    noquote = 2;
			    break;

			default:
			def_case:
			    if (isprint(pointer[i]) && pointer[i] != '"') {
				if (noquote) {
				    putc('"', NetTrace);
				    noquote = 0;
				}
				putc(pointer[i], NetTrace);
			    } else {
				fprintf(NetTrace, "\" %03o " + noquote,
							pointer[i]);
				noquote = 2;
			    }
			    break;
			}
		    }
		    if (!noquote)
			putc('"', NetTrace);
		    break;
		}
	    }
	    break;

	default:
	    if (TELOPT_OK(pointer[0]))
		fprintf(NetTrace, "%s (unknown)", TELOPT(pointer[0]));
	    else
		fprintf(NetTrace, "%d (unknown)", pointer[i]);
	    for (i = 1; i < length; i++)
		fprintf(NetTrace, " %d", pointer[i]);
	    break;
	}
	if (direction) {
	    if (NetTrace == stdout)
		fprintf(NetTrace, "\r\n");
	    else
		fprintf(NetTrace, "\n");
	}
    }
}

void SetForExit(void) {
    setconnmode(0);
#if defined(TN3270)
    if (In3270) {
	Finish3270();
    }
#else	/* defined(TN3270) */
    do {
	telrcv();			/* Process any incoming data */
	EmptyTerminal();
    } while (netiring.full_count());	/* While there is any */
#endif	/* defined(TN3270) */
    setcommandmode();
    fflush(stdout);
    fflush(stderr);
#if defined(TN3270)
    if (In3270) {
	StopScreen(1);
    }
#endif	/* defined(TN3270) */
    setconnmode(0);
    EmptyTerminal();			/* Flush the path to the tty */
    setcommandmode();
}

void Exit(int returnCode) {
    SetForExit();
    exit(returnCode);
}

void ExitString(const char *string, int returnCode) {
    SetForExit();
    fwrite(string, 1, strlen(string), stderr);
    exit(returnCode);
}