*/
/*
* @(#)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.
*/
#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)
projects / tcpdump / blobdiff