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freebsd-dev/contrib/tcpdump/print-fr.c
kris ca18414919 * Buffer-safe string function cleanup. There are a couple of strcpy() 
and strcat()s which would be more difficult to fix, but I think they're
  safe anyway.
* Don't crash at runtime by overflowing a buffer with constant data in
  print-icmp.c on a long hostname.
* Don't overflow a static buffer by trying to decode an AFS ACL into a buffer
  which is way too small for it.

Reviewed by:    -audit
2000-10-05 02:49:49 +00:00

427 lines
11 KiB
C
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/*
* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* $FreeBSD$
*/
#ifndef lint
static char rcsid[] =
"@(#)$Header: /home/ncvs/src/contrib/tcpdump/print-fr.c,v 1.1 1997/12/31 21:50:31 pst Exp $ (LBL)";
#endif
#ifdef PPP
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#if __STDC__
struct mbuf;
struct rtentry;
#endif
#include <net/if.h>
#include <net/if_var.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <ctype.h>
#include <netdb.h>
#include <pcap.h>
#include <signal.h>
#include <stdio.h>
#include <netinet/if_ether.h>
#include "ethertype.h"
#include <net/ppp_defs.h>
#include "interface.h"
#include "addrtoname.h"
void q933_print();
#define FR_EA_BIT(p) ((p)&0x1)
#define FR_DLCI(b0,b1) ((((b0)&0xFC)<<2)+(((b1)&0xF0)>>4))
struct fr_nlpids {
u_short id;
char *name;
};
/* find out how many bytes are there in a frame */
int
fr_addr_len(const u_char *p)
{
int i=0;
while (!FR_EA_BIT(p[i]) && i++ && !FR_EA_BIT(p[i+1])) i++;
return (i+1);
}
/* the following is for framerelay */
#define NLPID_LEN 1 /* NLPID is one byte long */
#define NLPID_Q933 0x08
#define NLPID_CLNP 0x81
#define NLPID_ESIS 0x82
#define NLPID_ISIS 0x83
#define NLPID_CONS 0x84
#define NLPID_IDRP 0x85
#define NLPID_X25_ESIS 0x8a
#define NLPID_IP 0xcc
static struct fr_nlpids fr_nlpids[256];
static fr_nlpid_flag =0;
void init_fr_nlpids()
{
int i;
if (!fr_nlpid_flag) {
for (i=0; i < 256; i++) {
fr_nlpids[i].id = 0;
fr_nlpids[i].name = "Not Specified";
}
fr_nlpids[NLPID_Q933].name = "Q.933";
fr_nlpids[NLPID_CLNP].name = "CLNP";
fr_nlpids[NLPID_ESIS].name = "ESIS";
fr_nlpids[NLPID_ISIS].name = "ISIS";
fr_nlpids[NLPID_CONS].name = "CONS";
fr_nlpids[NLPID_IDRP].name = "IDRP";
fr_nlpids[NLPID_X25_ESIS].name = "X25_ESIS";
fr_nlpids[NLPID_IP].name = "IP";
}
fr_nlpid_flag = 1;
}
/* Framerelay packet structure */
/*
+---------------------------+
| flag (7E hexadecimal) |
+---------------------------+
| Q.922 Address* |
+-- --+
| |
+---------------------------+
| Control (UI = 0x03) |
+---------------------------+
| Optional Pad (0x00) |
+---------------------------+
| NLPID |
+---------------------------+
| . |
| . |
| . |
| Data |
| . |
| . |
+---------------------------+
| Frame Check Sequence |
+-- . --+
| (two octets) |
+---------------------------+
| flag (7E hexadecimal) |
+---------------------------+
* Q.922 addresses, as presently defined, are two octets and
contain a 10-bit DLCI. In some networks Q.922 addresses
may optionally be increased to three or four octets.
*/
#define FR_PROTOCOL(p) fr_protocol((p))
int
fr_hdrlen(const u_char *p)
{
int hlen;
hlen = fr_addr_len(p)+1; /* addr_len + 0x03 + padding */
if( p[hlen] )
return hlen;
else
return hlen+1;
}
#define LAYER2_LEN(p) (fr_hdrlen((p))+NLPID_LEN)
int
fr_protocol(const u_char *p)
{
int hlen;
hlen = fr_addr_len(p) + 1;
if (p[hlen]) /* check for padding */
return p[hlen];
else
return p[hlen+1];
}
void
fr_hdlc_print(const u_char *p, int length)
{
int proto;
int i;
int hlen;
proto = FR_PROTOCOL(p);
init_fr_nlpids();
/* this is kinda kludge since it assumed that DLCI is two bytes. */
printf("%4d %02x%02x=DLCI(%d) ", length, p[0], p[1], FR_DLCI(p[0],p[1]));
printf("%02x %6s: ", proto, fr_nlpids[proto].name);
}
void
fr_if_print(u_char *user, const struct pcap_pkthdr *h,
register const u_char *p)
{
register u_int length = h->len;
register u_int caplen = h->caplen;
int frame_relay = 0,
proto = FR_PROTOCOL(p);
ts_print(&h->ts);
if (caplen < fr_hdrlen(p)) {
printf("[|fr]");
goto out;
}
/*
* Some printers want to get back at the link level addresses,
* and/or check that they're not walking off the end of the packet.
* Rather than pass them all the way down, we set these globals.
*/
packetp = p;
snapend = p + caplen;
if (eflag)
fr_hdlc_print(p, length);
length = length - (fr_hdrlen(p) + NLPID_LEN);
switch(FR_PROTOCOL(p)) {
case NLPID_IP:
case ETHERTYPE_IP:
ip_print((const u_char *)(p + LAYER2_LEN(p)), length);
break;
case NLPID_CLNP:
case NLPID_ESIS:
case NLPID_ISIS:
isoclns_print((const u_char *)(p + LAYER2_LEN(p)), length,
caplen, "000000", "000000");
break;
case NLPID_Q933:
q933_print((const u_char *)(p + LAYER2_LEN(p)), length);
break;
default:
if(!eflag)
fr_hdlc_print(p, length);
if(!xflag)
default_print((const u_char *)(p + LAYER2_LEN(p)),
caplen - LAYER2_LEN(p));
}
if (xflag)
default_print((const u_char *)(p + LAYER2_LEN(p)),
caplen - LAYER2_LEN(p));
out:
putchar('\n');
}
#else
#include <sys/types.h>
#include <sys/time.h>
#include <stdio.h>
#include "interface.h"
void
fr_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
{
error("not configured for ppp");
/* NOTREACHED */
}
#endif
/*
* Q.933 decoding portion for framerelay specific.
*/
/* Q.933 packet format
Format of Other Protocols
using Q.933 NLPID
+-------------------------------+
| Q.922 Address |
+---------------+---------------+
|Control 0x03 | NLPID 0x08 |
+---------------+---------------+
| L2 Protocol ID |
| octet 1 | octet 2 |
+-------------------------------+
| L3 Protocol ID |
| octet 2 | octet 2 |
+-------------------------------+
| Protocol Data |
+-------------------------------+
| FCS |
+-------------------------------+
*/
/* L2 (Octet 1)- Call Reference Usually is 0x0 */
/*
* L2 (Octet 2)- Message Types definition 1 byte long.
*/
/* Call Establish */
#define MSG_TYPE_ESC_TO_NATIONAL 0x00
#define MSG_TYPE_ALERT 0x01
#define MSG_TYPE_CALL_PROCEEDING 0x02
#define MSG_TYPE_CONNECT 0x07
#define MSG_TYPE_CONNECT_ACK 0x0F
#define MSG_TYPE_PROGRESS 0x03
#define MSG_TYPE_SETUP 0x05
/* Call Clear */
#define MSG_TYPE_DISCONNECT 0x45
#define MSG_TYPE_RELEASE 0x4D
#define MSG_TYPE_RELEASE_COMPLETE 0x5A
#define MSG_TYPE_RESTART 0x46
#define MSG_TYPE_RESTART_ACK 0x4E
/* Status */
#define MSG_TYPE_STATUS 0x7D
#define MSG_TYPE_STATUS_ENQ 0x75
#define ONE_BYTE_IE_MASK 0xF0
/* See L2 protocol ID picture above */
struct q933_header {
u_char call_ref; /* usually is 0 for framerelay PVC */
u_char msg_type;
};
#define REPORT_TYPE_IE 0x01
#define LINK_VERIFY_IE_91 0x19
#define LINK_VERIFY_IE_94 0x03
#define PVC_STATUS_IE 0x07
#define MAX_IE_SIZE
struct common_ie_header {
u_char ie_id;
u_char ie_len;
};
#define FULL_STATUS 0
#define LINK_VERIFY 1
#define ASYNC_PVC 2
void
q933_print(const u_char *p, int length)
{
struct q933_header *header = (struct q933_header *)(p+1);
const u_char *ptemp = p;
int ie_type, ie_len;
char *decode_str, temp_str[255];
struct common_ie_header *ie_p;
/* printing out header part */
printf("Call Ref: %02x, MSG Type: %02x",
header->call_ref, header->msg_type);
switch(header->msg_type) {
case MSG_TYPE_STATUS:
decode_str = "STATUS REPLY";
break;
case MSG_TYPE_STATUS_ENQ:
decode_str = "STATUS ENQUIRY";
break;
default:
decode_str = "UNKNOWN MSG Type";
}
printf(" %s\n", decode_str);
length = length - 3;
ptemp = ptemp + 3;
/* Loop through the rest of IE */
while( length > 0 ) {
if( ptemp[0] & ONE_BYTE_IE_MASK ) {
ie_len = 1;
printf("\t\tOne byte IE: %02x, Content %02x\n",
(*ptemp & 0x70)>>4, (*ptemp & 0x0F));
length--;
ptemp++;
}
else { /* Multi-byte IE */
ie_p = (struct common_ie_header *)ptemp;
switch (ie_p->ie_id) {
case REPORT_TYPE_IE:
switch(ptemp[2]) {
case FULL_STATUS:
decode_str = "FULL STATUS";
break;
case LINK_VERIFY:
decode_str = "LINK VERIFY";
break;
case ASYNC_PVC:
decode_str = "Async PVC Status";
break;
default:
decode_str = "Reserved Value";
}
break;
case LINK_VERIFY_IE_91:
case LINK_VERIFY_IE_94:
snprintf(temp_str, sizeof(temp_str), "TX Seq: %3d, RX Seq: %3d",
ptemp[2], ptemp[3]);
decode_str = temp_str;
break;
case PVC_STATUS_IE:
snprintf(temp_str,sizeof(temp_str), "DLCI %d: status %s %s",
((ptemp[2]&0x3f)<<4)+ ((ptemp[3]&0x78)>>3),
ptemp[4] & 0x8 ?"new,":" ",
ptemp[4] & 0x2 ?"Active":"Inactive");
break;
default:
decode_str = "Non-decoded Value";
}
printf("\t\tIE: %02X Len: %d, %s\n",
ie_p->ie_id, ie_p->ie_len, decode_str);
length = length - ie_p->ie_len - 2;
ptemp = ptemp + ie_p->ie_len + 2;
}
}
}
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