*/
#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-l2tp.c,v 1.11 2002-05-25 09:41:07 guy Exp $";
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/tcpdump/print-l2tp.c,v 1.20 2006-06-23 02:03:09 hannes Exp $";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
+#include <tcpdump-stdinc.h>
+
#include <stdio.h>
-#include <sys/types.h>
-#include <sys/param.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
#include "l2tp.h"
#include "interface.h"
static char tstr[] = " [|l2tp]";
-#ifndef TRUE
-#define TRUE 1
-#endif
-
-#ifndef FALSE
-#define FALSE 0
-#endif
-
#define L2TP_MSGTYPE_SCCRQ 1 /* Start-Control-Connection-Request */
#define L2TP_MSGTYPE_SCCRP 2 /* Start-Control-Connection-Reply */
#define L2TP_MSGTYPE_SCCCN 3 /* Start-Control-Connection-Connected */
{ L2TP_AVP_MAXIMUM_BPS, "MAXIMUM_BPS" },
{ L2TP_AVP_BEARER_TYPE, "BEARER_TYPE" },
{ L2TP_AVP_FRAMING_TYPE, "FRAMING_TYPE" },
- { L2TP_AVP_PACKET_PROC_DELAY, "PACKET_PROC_DELAY" },
+ { L2TP_AVP_PACKET_PROC_DELAY, "PACKET_PROC_DELAY" },
{ L2TP_AVP_CALLED_NUMBER, "CALLED_NUMBER" },
{ L2TP_AVP_CALLING_NUMBER, "CALLING_NUMBER" },
{ L2TP_AVP_SUB_ADDRESS, "SUB_ADDRESS" },
{ L2TP_AVP_TX_CONN_SPEED, "TX_CONN_SPEED" },
{ L2TP_AVP_PHY_CHANNEL_ID, "PHY_CHANNEL_ID" },
{ L2TP_AVP_INI_RECV_LCP, "INI_RECV_LCP" },
- { L2TP_AVP_LAST_SENT_LCP, "LAST_SENT_LCP" },
- { L2TP_AVP_LAST_RECV_LCP, "LAST_RECV_LCP" },
- { L2TP_AVP_PROXY_AUTH_TYPE, "PROXY_AUTH_TYPE" },
+ { L2TP_AVP_LAST_SENT_LCP, "LAST_SENT_LCP" },
+ { L2TP_AVP_LAST_RECV_LCP, "LAST_RECV_LCP" },
+ { L2TP_AVP_PROXY_AUTH_TYPE, "PROXY_AUTH_TYPE" },
{ L2TP_AVP_PROXY_AUTH_NAME, "PROXY_AUTH_NAME" },
- { L2TP_AVP_PROXY_AUTH_CHAL, "PROXY_AUTH_CHAL" },
+ { L2TP_AVP_PROXY_AUTH_CHAL, "PROXY_AUTH_CHAL" },
{ L2TP_AVP_PROXY_AUTH_ID, "PROXY_AUTH_ID" },
{ L2TP_AVP_PROXY_AUTH_RESP, "PROXY_AUTH_RESP" },
{ L2TP_AVP_CALL_ERRORS, "CALL_ERRORS" },
- { L2TP_AVP_ACCM, "ACCM" },
- { L2TP_AVP_RANDOM_VECTOR, "RANDOM_VECTOR" },
+ { L2TP_AVP_ACCM, "ACCM" },
+ { L2TP_AVP_RANDOM_VECTOR, "RANDOM_VECTOR" },
{ L2TP_AVP_PRIVATE_GRP_ID, "PRIVATE_GRP_ID" },
- { L2TP_AVP_RX_CONN_SPEED, "RX_CONN_SPEED" },
- { L2TP_AVP_SEQ_REQUIRED, "SEQ_REQUIRED" },
- { L2TP_AVP_PPP_DISCON_CC, "PPP_DISCON_CC" },
+ { L2TP_AVP_RX_CONN_SPEED, "RX_CONN_SPEED" },
+ { L2TP_AVP_SEQ_REQUIRED, "SEQ_REQUIRED" },
+ { L2TP_AVP_PPP_DISCON_CC, "PPP_DISCON_CC" },
{ 0, NULL }
};
/******************************/
/* generic print out routines */
/******************************/
-static void
+static void
print_string(const u_char *dat, u_int length)
{
- int i;
+ u_int i;
for (i=0; i<length; i++) {
printf("%c", *dat++);
}
}
-static void
+static void
print_octets(const u_char *dat, u_int length)
{
- int i;
+ u_int i;
for (i=0; i<length; i++) {
printf("%02x", *dat++);
}
l2tp_result_code_print(const u_char *dat, u_int length)
{
u_int16_t *ptr = (u_int16_t *)dat;
-
+
printf("%u", EXTRACT_16BITS(ptr)); ptr++; /* Result Code */
if (length > 2) { /* Error Code (opt) */
printf("/%u", EXTRACT_16BITS(ptr)); ptr++;
if (length > 3) {
printf(" ");
print_string(dat+3, length-3);
- }
+ }
}
static void
{
u_int16_t *ptr = (u_int16_t *)dat;
- printf("%s", tok2str(l2tp_authentype2str,
+ printf("%s", tok2str(l2tp_authentype2str,
"AuthType-#%u", EXTRACT_16BITS(ptr)));
}
{
u_int16_t *ptr = (u_int16_t *)dat;
u_int16_t val_h, val_l;
-
+
ptr++; /* skip "Reserved" */
val_h = EXTRACT_16BITS(ptr); ptr++;
val_h = EXTRACT_16BITS(ptr); ptr++;
val_l = EXTRACT_16BITS(ptr); ptr++;
printf("send=%08x ", (val_h<<16) + val_l);
-
+
val_h = EXTRACT_16BITS(ptr); ptr++;
val_l = EXTRACT_16BITS(ptr); ptr++;
printf("recv=%08x ", (val_h<<16) + val_l);
l2tp_ppp_discon_cc_print(const u_char *dat, u_int length)
{
u_int16_t *ptr = (u_int16_t *)dat;
-
+
printf("%04x, ", EXTRACT_16BITS(ptr)); ptr++; /* Disconnect Code */
printf("%04x ", EXTRACT_16BITS(ptr)); ptr++; /* Control Protocol Number */
- printf("%s", tok2str(l2tp_cc_direction2str,
+ printf("%s", tok2str(l2tp_cc_direction2str,
"Direction-#%u", *((u_char *)ptr++)));
if (length > 5) {
TCHECK(*ptr); /* Flags & Length */
len = EXTRACT_16BITS(ptr) & L2TP_AVP_HDR_LEN_MASK;
- /* If it is not long enough to decode the entire AVP, we'll
- abandon. */
+ /* If it is not long enough to contain the header, we'll give up. */
+ if (len < 6)
+ goto trunc;
+
+ /* If it goes past the end of the remaining length of the packet,
+ we'll give up. */
+ if (len > (u_int)length)
+ goto trunc;
+
+ /* If it goes past the end of the remaining length of the captured
+ data, we'll give up. */
TCHECK2(*ptr, len);
/* After this point, no need to worry about truncation */
print_octets((u_char *)ptr, len-6);
printf(")");
} else {
- /* IETF-defined Attributes */
+ /* IETF-defined Attributes */
ptr++;
attr_type = EXTRACT_16BITS(ptr); ptr++;
printf("%s", tok2str(l2tp_avp2str, "AVP-#%u", attr_type));
case L2TP_AVP_CALLED_NUMBER:
case L2TP_AVP_SUB_ADDRESS:
case L2TP_AVP_PROXY_AUTH_NAME:
- case L2TP_AVP_PRIVATE_GRP_ID:
+ case L2TP_AVP_PRIVATE_GRP_ID:
print_string((u_char *)ptr, len-6);
break;
case L2TP_AVP_CHALLENGE:
void
l2tp_print(const u_char *dat, u_int length)
{
- const u_int16_t *ptr = (u_int16_t *)dat;
+ const u_char *ptr = dat;
u_int cnt = 0; /* total octets consumed */
u_int16_t pad;
- int flag_t, flag_l, flag_s, flag_o, flag_p;
+ int flag_t, flag_l, flag_s, flag_o;
u_int16_t l2tp_len;
- flag_t = flag_l = flag_s = flag_o = flag_p = FALSE;
+ flag_t = flag_l = flag_s = flag_o = FALSE;
- TCHECK(*ptr); /* Flags & Version */
+ TCHECK2(*ptr, 2); /* Flags & Version */
if ((EXTRACT_16BITS(ptr) & L2TP_VERSION_MASK) == L2TP_VERSION_L2TP) {
printf(" l2tp:");
} else if ((EXTRACT_16BITS(ptr) & L2TP_VERSION_MASK) == L2TP_VERSION_L2F) {
flag_o = TRUE;
printf("O");
}
- if (EXTRACT_16BITS(ptr) & L2TP_FLAG_PRIORITY) {
- flag_p = TRUE;
+ if (EXTRACT_16BITS(ptr) & L2TP_FLAG_PRIORITY)
printf("P");
- }
printf("]");
- ptr++;
+ ptr += 2;
cnt += 2;
-
+
if (flag_l) {
- TCHECK(*ptr); /* Length */
- l2tp_len = EXTRACT_16BITS(ptr); ptr++;
+ TCHECK2(*ptr, 2); /* Length */
+ l2tp_len = EXTRACT_16BITS(ptr);
+ ptr += 2;
cnt += 2;
} else {
l2tp_len = 0;
}
- TCHECK(*ptr); /* Tunnel ID */
- printf("(%u/", EXTRACT_16BITS(ptr)); ptr++;
+ TCHECK2(*ptr, 2); /* Tunnel ID */
+ printf("(%u/", EXTRACT_16BITS(ptr));
+ ptr += 2;
cnt += 2;
- TCHECK(*ptr); /* Session ID */
- printf("%u)", EXTRACT_16BITS(ptr)); ptr++;
+ TCHECK2(*ptr, 2); /* Session ID */
+ printf("%u)", EXTRACT_16BITS(ptr));
+ ptr += 2;
cnt += 2;
if (flag_s) {
- TCHECK(*ptr); /* Ns */
- printf("Ns=%u,", EXTRACT_16BITS(ptr)); ptr++;
+ TCHECK2(*ptr, 2); /* Ns */
+ printf("Ns=%u,", EXTRACT_16BITS(ptr));
+ ptr += 2;
cnt += 2;
- TCHECK(*ptr); /* Nr */
- printf("Nr=%u", EXTRACT_16BITS(ptr)); ptr++;
+ TCHECK2(*ptr, 2); /* Nr */
+ printf("Nr=%u", EXTRACT_16BITS(ptr));
+ ptr += 2;
cnt += 2;
}
if (flag_o) {
- TCHECK(*ptr); /* Offset Size */
- pad = EXTRACT_16BITS(ptr); ptr++;
- ptr += pad / sizeof(*ptr);
+ TCHECK2(*ptr, 2); /* Offset Size */
+ pad = EXTRACT_16BITS(ptr);
+ ptr += (2 + pad);
cnt += (2 + pad);
}
+ if (flag_l) {
+ if (length < l2tp_len) {
+ printf(" Length %u larger than packet", l2tp_len);
+ return;
+ }
+ length = l2tp_len;
+ }
+ if (length < cnt) {
+ printf(" Length %u smaller than header length", length);
+ return;
+ }
if (flag_t) {
+ if (!flag_l) {
+ printf(" No length");
+ return;
+ }
if (length - cnt == 0) {
printf(" ZLB");
} else {
- l2tp_avp_print((u_char *)ptr, length - cnt);
+ l2tp_avp_print(ptr, length - cnt);
}
} else {
printf(" {");
- ppp_print((u_char *)ptr, length - cnt);
+ ppp_print(ptr, length - cnt);
printf("}");
}
trunc:
printf("%s", tstr);
-}
+}
projects / tcpdump / blobdiff