X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/b35a056ecffb5e8f1e31d4f6c6c9fb4a14bb7fb5..refs/heads/tcpdump-4.1:/print-telnet.c

diff --git a/print-telnet.c b/print-telnet.c
index 505369c5..4911e5ca 100644
--- a/print-telnet.c
+++ b/print-telnet.c
@@ -37,11 +37,11 @@
  */
 /*
  *      @(#)Copyright (c) 1994, Simon J. Gerraty.
- *      
+ *
  *      This is free software.  It comes with NO WARRANTY.
- *      Permission to use, modify and distribute this source code 
+ *      Permission to use, modify and distribute this source code
  *      is granted subject to the following conditions.
- *      1/ that the above copyright notice and this notice 
+ *      1/ that the above copyright notice and this notice
  *      are preserved in all copies.
  */
 
@@ -49,140 +49,214 @@
 #include "config.h"
 #endif
 
-#include <sys/cdefs.h>
-#if 0
 #ifndef lint
-__RCSID("$NetBSD: print-telnet.c,v 1.2 1999/10/11 12:40:12 sjg Exp $");
-#endif
+static const char rcsid[] _U_ =
+     "@(#) $Header: /tcpdump/master/tcpdump/print-telnet.c,v 1.24 2003-12-29 11:05:10 hannes Exp $";
 #endif
 
-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/types.h>
-
-#include <netinet/in.h>
-#include <netinet/in_systm.h>
-#include <netinet/ip.h>
-#include <netinet/ip_var.h>
-#include <netinet/tcp.h>
-#include <netinet/tcpip.h>
-
-#define TELCMDS
-#define TELOPTS
-#include <arpa/telnet.h>
+#include <tcpdump-stdinc.h>
 
 #include <stdio.h>
-#ifdef __STDC__
 #include <stdlib.h>
-#endif
-#include <unistd.h>
 #include <string.h>
 
 #include "interface.h"
 #include "addrtoname.h"
 
+#define TELCMDS
+#define TELOPTS
+#include "telnet.h"
 
-#ifndef TELCMD_FIRST
-# define TELCMD_FIRST SE
-#endif
+/* normal */
+static const char *cmds[] = {
+	"IS", "SEND", "INFO",
+};
 
-void
-telnet_print(register const u_char *sp, u_int length)
+/* 37: Authentication */
+static const char *authcmd[] = {
+	"IS", "SEND", "REPLY", "NAME",
+};
+static const char *authtype[] = {
+	"NULL", "KERBEROS_V4", "KERBEROS_V5", "SPX", "MINK",
+	"SRP", "RSA", "SSL", NULL, NULL,
+	"LOKI", "SSA", "KEA_SJ", "KEA_SJ_INTEG", "DSS",
+	"NTLM",
+};
+
+/* 38: Encryption */
+static const char *enccmd[] = {
+	"IS", "SUPPORT", "REPLY", "START", "END",
+	"REQUEST-START", "REQUEST-END", "END_KEYID", "DEC_KEYID",
+};
+static const char *enctype[] = {
+	"NULL", "DES_CFB64", "DES_OFB64", "DES3_CFB64", "DES3_OFB64",
+	NULL, "CAST5_40_CFB64", "CAST5_40_OFB64", "CAST128_CFB64", "CAST128_OFB64",
+};
+
+#define STR_OR_ID(x, tab) \
+	(((x) < sizeof(tab)/sizeof(tab[0]) && tab[(x)]) ? tab[(x)] : numstr(x))
+
+static char *
+numstr(int x)
 {
-	static char tnet[128];
-	register int i, c, x;
-	register u_char *rcp;
-	int off, first = 1;
-	u_char	*osp;
-
-	off = 0;
-	x = 0;
-	
-	while (length > 0 && *sp == IAC) {
-		osp = (u_char *) sp;
-		tnet[0] = '\0';
-		
-		c = *sp++;
-		length--;
-		switch (*sp) {
-		case IAC:			/* <IAC><IAC>! */
-			if (length > 1 && sp[1] == IAC) {
-				(void)strcpy(tnet, "IAC IAC");
-			} else {
-				length = 0;
-				continue;
-			}
+	static char buf[20];
+
+	snprintf(buf, sizeof(buf), "%#x", x);
+	return buf;
+}
+
+/* sp points to IAC byte */
+static int
+telnet_parse(const u_char *sp, u_int length, int print)
+{
+	int i, x;
+	u_int c;
+	const u_char *osp, *p;
+#define FETCH(c, sp, length) \
+	do { \
+		if (length < 1) \
+			goto pktend; \
+		TCHECK(*sp); \
+		c = *sp++; \
+		length--; \
+	} while (0)
+
+	osp = sp;
+
+	FETCH(c, sp, length);
+	if (c != IAC)
+		goto pktend;
+	FETCH(c, sp, length);
+	if (c == IAC) {		/* <IAC><IAC>! */
+		if (print)
+			printf("IAC IAC");
+		goto done;
+	}
+
+	i = c - TELCMD_FIRST;
+	if (i < 0 || i > IAC - TELCMD_FIRST)
+		goto pktend;
+
+	switch (c) {
+	case DONT:
+	case DO:
+	case WONT:
+	case WILL:
+	case SB:
+		/* DONT/DO/WONT/WILL x */
+		FETCH(x, sp, length);
+		if (x >= 0 && x < NTELOPTS) {
+			if (print)
+				(void)printf("%s %s", telcmds[i], telopts[x]);
+		} else {
+			if (print)
+				(void)printf("%s %#x", telcmds[i], x);
+		}
+		if (c != SB)
+			break;
+		/* IAC SB .... IAC SE */
+		p = sp;
+		while (length > (u_int)(p + 1 - sp)) {
+			if (p[0] == IAC && p[1] == SE)
+				break;
+			p++;
+		}
+		if (*p != IAC)
+			goto pktend;
+
+		switch (x) {
+		case TELOPT_AUTHENTICATION:
+			if (p <= sp)
+				break;
+			FETCH(c, sp, length);
+			if (print)
+				(void)printf(" %s", STR_OR_ID(c, authcmd));
+			if (p <= sp)
+				break;
+			FETCH(c, sp, length);
+			if (print)
+				(void)printf(" %s", STR_OR_ID(c, authtype));
+			break;
+		case TELOPT_ENCRYPT:
+			if (p <= sp)
+				break;
+			FETCH(c, sp, length);
+			if (print)
+				(void)printf(" %s", STR_OR_ID(c, enccmd));
+			if (p <= sp)
+				break;
+			FETCH(c, sp, length);
+			if (print)
+				(void)printf(" %s", STR_OR_ID(c, enctype));
 			break;
 		default:
-			c = *sp++;
-			length--;
-			if ((i = c - TELCMD_FIRST) < 0
-			    || i > IAC - TELCMD_FIRST) {
-				(void)printf("unknown: ff%02x\n", c);
-				return;
-			}
-			switch (c) {
-			case DONT:
-			case DO:
-			case WONT:
-			case WILL:
-			case SB:
-				x = *sp++; /* option */
-				length--;
-				if (x >= 0 && x < NTELOPTS) {
-					(void)sprintf(tnet, "%s %s",
-						      telcmds[i], telopts[x]);
-				} else {
-					(void)sprintf(tnet, "%s %#x",
-						      telcmds[i], x);
-				}
+			if (p <= sp)
 				break;
-			default:
-				(void)strcpy(tnet, telcmds[i]);
-			}
-			if (c == SB) {
-				c = *sp++;
-				length--;
-				(void)strcat(tnet, c ? " SEND" : " IS '");
-				rcp = (u_char *) sp;
-				i = strlen(tnet);
-				while (length > 0 && (x = *sp++) != IAC)
-					--length;
-				if (x == IAC) {
-					if (2 < vflag
-					    && i + 16 + sp - rcp < sizeof(tnet)) {
-						(void)strncpy(&tnet[i], rcp, sp - rcp);
-						i += (sp - rcp) - 1;
-						tnet[i] = '\0';
-					} else if (i + 8 < sizeof(tnet)) {
-						(void)strcat(&tnet[i], "...");
-					}
-					if (*sp++ == SE
-					    && i + 4 < sizeof(tnet))
-						(void)strcat(tnet, c ? " SE" : "' SE");
-				} else if (i + 16 < sizeof(tnet)) {
-					(void)strcat(tnet, " truncated!");
-				}
-			}
+			FETCH(c, sp, length);
+			if (print)
+				(void)printf(" %s", STR_OR_ID(c, cmds));
 			break;
 		}
+		while (p > sp) {
+			FETCH(x, sp, length);
+			if (print)
+				(void)printf(" %#x", x);
+		}
+		/* terminating IAC SE */
+		if (print)
+			(void)printf(" SE");
+		sp += 2;
+		length -= 2;
+		break;
+	default:
+		if (print)
+			(void)printf("%s", telcmds[i]);
+		goto done;
+	}
+
+done:
+	return sp - osp;
+
+trunc:
+	(void)printf("[|telnet]");
+pktend:
+	return -1;
+#undef FETCH
+}
+
+void
+telnet_print(const u_char *sp, u_int length)
+{
+	int first = 1;
+	const u_char *osp;
+	int l;
+
+	osp = sp;
+
+	while (length > 0 && *sp == IAC) {
+		l = telnet_parse(sp, length, 0);
+		if (l < 0)
+			break;
+
 		/*
 		 * now print it
 		 */
 		if (Xflag && 2 < vflag) {
 			if (first)
-				printf("\nTelnet:\n");
-			i = sp - osp;
-			hex_print_with_offset(osp, i, off);
-			off += i;
-			if (i > 8)
-				printf("\n\t\t\t\t%s", tnet);
+				printf("\nTelnet:");
+			hex_print_with_offset("\n", sp, l, sp - osp);
+			if (l > 8)
+				printf("\n\t\t\t\t");
 			else
-				printf("%*s\t%s", (8 - i) * 3, "", tnet);
-		} else {
-			printf("%s%s", (first) ? " [telnet " : ", ", tnet);
-		}
+				printf("%*s\t", (8 - l) * 3, "");
+		} else
+			printf("%s", (first) ? " [telnet " : ", ");
+
+		(void)telnet_parse(sp, length, 1);
 		first = 0;
+
+		sp += l;
+		length -= l;
 	}
 	if (!first) {
 		if (Xflag && 2 < vflag)