Handle very large -f files by rejecting them.

[tcpdump] / print-chdlc.c

diff --git a/print-chdlc.c b/print-chdlc.c
index 261b15ad7efde71dd9c16b8dce4fdfc4baae13a1..24acfbd2e86c94ed85983d01181740831fa1f1e1 100644 (file)
--- a/print-chdlc.c
+++ b/print-chdlc.c
@@ -19,30 +19,23 @@
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 

-#ifndef lint
-static const char rcsid[] _U_ =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.43 2005-11-29 08:56:19 hannes Exp $ (LBL)";
-#endif
+/* \summary: Cisco HDLC printer */

 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 

-#include <tcpdump-stdinc.h>
-
-#include <pcap.h>
-#include <stdio.h>
+#include <netdissect-stdinc.h>

 
 

-#include "interface.h"
+#include "netdissect.h"

 #include "addrtoname.h"
 #include "ethertype.h"
 #include "extract.h"
 #include "addrtoname.h"
 #include "ethertype.h"
 #include "extract.h"

-#include "ppp.h"

 #include "chdlc.h"
 
 #include "chdlc.h"
 

-static void chdlc_slarp_print(const u_char *, u_int);
+static void chdlc_slarp_print(netdissect_options *, const u_char *, u_int);

 
 

-const struct tok chdlc_cast_values[] = { 
+static const struct tok chdlc_cast_values[] = {

     { CHDLC_UNICAST, "unicast" },
     { CHDLC_BCAST, "bcast" },
     { 0, NULL}
     { CHDLC_UNICAST, "unicast" },
     { CHDLC_BCAST, "bcast" },
     { 0, NULL}


@@ -51,29 +44,27 @@ const struct tok chdlc_cast_values[] = {
 
 /* Standard CHDLC printer */
 u_int
 
 /* Standard CHDLC printer */
 u_int

-chdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
+chdlc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p)

 {
 {

-       register u_int length = h->len;
-       register u_int caplen = h->caplen;
-
-       if (caplen < CHDLC_HDRLEN) {
-               printf("[|chdlc]");
-               return (caplen);
-       }
-        return (chdlc_print(p,length));
+       return chdlc_print(ndo, p, h->len);

 }
 
 u_int
 }
 
 u_int

-chdlc_print(register const u_char *p, u_int length) {
+chdlc_print(netdissect_options *ndo, register const u_char *p, u_int length)
+{

        u_int proto;
        u_int proto;

+       const u_char *bp = p;

 
 

+       if (length < CHDLC_HDRLEN)
+               goto trunc;
+       ND_TCHECK2(*p, CHDLC_HDRLEN);

        proto = EXTRACT_16BITS(&p[2]);
        proto = EXTRACT_16BITS(&p[2]);

-       if (eflag) {
-                printf("%s, ethertype %s (0x%04x), length %u: ",
+       if (ndo->ndo_eflag) {
+                ND_PRINT((ndo, "%s, ethertype %s (0x%04x), length %u: ",

                        tok2str(chdlc_cast_values, "0x%02x", p[0]),
                        tok2str(ethertype_values, "Unknown", proto),
                        proto,
                        tok2str(chdlc_cast_values, "0x%02x", p[0]),
                        tok2str(ethertype_values, "Unknown", proto),
                        proto,

-                       length);
+                       length));

        }
 
        length -= CHDLC_HDRLEN;
        }
 
        length -= CHDLC_HDRLEN;


@@ -81,15 +72,13 @@ chdlc_print(register const u_char *p, u_int length) {
 
        switch (proto) {
        case ETHERTYPE_IP:
 
        switch (proto) {
        case ETHERTYPE_IP:

-               ip_print(gndo, p, length);
+               ip_print(ndo, p, length);

                break;
                break;

-#ifdef INET6

        case ETHERTYPE_IPV6:
        case ETHERTYPE_IPV6:

-               ip6_print(gndo, p, length);
+               ip6_print(ndo, p, length);

                break;
                break;

-#endif

        case CHDLC_TYPE_SLARP:
        case CHDLC_TYPE_SLARP:

-               chdlc_slarp_print(p, length);
+               chdlc_slarp_print(ndo, p, length);

                break;
 #if 0
        case CHDLC_TYPE_CDP:
                break;
 #if 0
        case CHDLC_TYPE_CDP:


@@ -98,43 +87,50 @@ chdlc_print(register const u_char *p, u_int length) {
 #endif
         case ETHERTYPE_MPLS:
         case ETHERTYPE_MPLS_MULTI:
 #endif
         case ETHERTYPE_MPLS:
         case ETHERTYPE_MPLS_MULTI:

-                mpls_print(p, length);
+                mpls_print(ndo, p, length);

                break;
         case ETHERTYPE_ISO:
                 /* is the fudge byte set ? lets verify by spotting ISO headers */
                break;
         case ETHERTYPE_ISO:
                 /* is the fudge byte set ? lets verify by spotting ISO headers */

+                if (length < 2)
+                    goto trunc;
+                ND_TCHECK_16BITS(p);

                 if (*(p+1) == 0x81 ||
                     *(p+1) == 0x82 ||
                     *(p+1) == 0x83)
                 if (*(p+1) == 0x81 ||
                     *(p+1) == 0x82 ||
                     *(p+1) == 0x83)

-                    isoclns_print(p+1, length-1, length-1);
+                    isoclns_print(ndo, p + 1, length - 1);

                 else
                 else

-                    isoclns_print(p, length, length);
+                    isoclns_print(ndo, p, length);

                 break;
        default:
                 break;
        default:

-                if (!eflag)
-                        printf("unknown CHDLC protocol (0x%04x)", proto);
+                if (!ndo->ndo_eflag)
+                        ND_PRINT((ndo, "unknown CHDLC protocol (0x%04x)", proto));

                 break;
        }
 
        return (CHDLC_HDRLEN);
                 break;
        }
 
        return (CHDLC_HDRLEN);

+
+trunc:
+       ND_PRINT((ndo, "[|chdlc]"));
+       return ndo->ndo_snapend - bp;

 }
 
 /*
  * The fixed-length portion of a SLARP packet.
  */
 struct cisco_slarp {
 }
 
 /*
  * The fixed-length portion of a SLARP packet.
  */
 struct cisco_slarp {

-       u_int8_t code[4];
+       uint8_t code[4];

 #define SLARP_REQUEST  0
 #define SLARP_REPLY    1
 #define SLARP_KEEPALIVE        2
        union {
                struct {
 #define SLARP_REQUEST  0
 #define SLARP_REPLY    1
 #define SLARP_KEEPALIVE        2
        union {
                struct {

-                       u_int8_t addr[4];
-                       u_int8_t mask[4];
+                       uint8_t addr[4];
+                       uint8_t mask[4];

                } addr;
                struct {
                } addr;
                struct {

-                       u_int8_t myseq[4];
-                       u_int8_t yourseq[4];
-                       u_int8_t rel[2];
+                       uint8_t myseq[4];
+                       uint8_t yourseq[4];
+                       uint8_t rel[2];

                } keep;
        } un;
 };
                } keep;
        } un;
 };


@@ -143,20 +139,20 @@ struct cisco_slarp {
 #define SLARP_MAX_LEN  18
 
 static void
 #define SLARP_MAX_LEN  18
 
 static void

-chdlc_slarp_print(const u_char *cp, u_int length)
+chdlc_slarp_print(netdissect_options *ndo, const u_char *cp, u_int length)

 {
        const struct cisco_slarp *slarp;
         u_int sec,min,hrs,days;
 
 {
        const struct cisco_slarp *slarp;
         u_int sec,min,hrs,days;
 

-        printf("SLARP (length: %u), ",length);
+       ND_PRINT((ndo, "SLARP (length: %u), ",length));

        if (length < SLARP_MIN_LEN)
                goto trunc;
 
        slarp = (const struct cisco_slarp *)cp;
        if (length < SLARP_MIN_LEN)
                goto trunc;
 
        slarp = (const struct cisco_slarp *)cp;

-       TCHECK2(*slarp, SLARP_MIN_LEN);
+       ND_TCHECK2(*slarp, SLARP_MIN_LEN);

        switch (EXTRACT_32BITS(&slarp->code)) {
        case SLARP_REQUEST:
        switch (EXTRACT_32BITS(&slarp->code)) {
        case SLARP_REQUEST:

-               printf("request");
+               ND_PRINT((ndo, "request"));

                /*
                 * At least according to William "Chops" Westfield's
                 * message in
                /*
                 * At least according to William "Chops" Westfield's
                 * message in


@@ -168,42 +164,41 @@ chdlc_slarp_print(const u_char *cp, u_int length)
                 */
                break;
        case SLARP_REPLY:
                 */
                break;
        case SLARP_REPLY:

-               printf("reply %s/%s",
-                       ipaddr_string(&slarp->un.addr.addr),
-                       ipaddr_string(&slarp->un.addr.mask));
+               ND_PRINT((ndo, "reply %s/%s",
+                       ipaddr_string(ndo, &slarp->un.addr.addr),
+                       ipaddr_string(ndo, &slarp->un.addr.mask)));

                break;
        case SLARP_KEEPALIVE:
                break;
        case SLARP_KEEPALIVE:

-               printf("keepalive: mineseen=0x%08x, yourseen=0x%08x, reliability=0x%04x",
+               ND_PRINT((ndo, "keepalive: mineseen=0x%08x, yourseen=0x%08x, reliability=0x%04x",

                        EXTRACT_32BITS(&slarp->un.keep.myseq),
                        EXTRACT_32BITS(&slarp->un.keep.yourseq),
                        EXTRACT_32BITS(&slarp->un.keep.myseq),
                        EXTRACT_32BITS(&slarp->un.keep.yourseq),

-                       EXTRACT_16BITS(&slarp->un.keep.rel));
+                       EXTRACT_16BITS(&slarp->un.keep.rel)));

 
                 if (length >= SLARP_MAX_LEN) { /* uptime-stamp is optional */
                         cp += SLARP_MIN_LEN;
 
                 if (length >= SLARP_MAX_LEN) { /* uptime-stamp is optional */
                         cp += SLARP_MIN_LEN;

-                        if (!TTEST2(*cp, 4))
-                                goto trunc;
+                        ND_TCHECK2(*cp, 4);

                         sec = EXTRACT_32BITS(cp) / 1000;
                         min = sec / 60; sec -= min * 60;
                         hrs = min / 60; min -= hrs * 60;
                         days = hrs / 24; hrs -= days * 24;
                         sec = EXTRACT_32BITS(cp) / 1000;
                         min = sec / 60; sec -= min * 60;
                         hrs = min / 60; min -= hrs * 60;
                         days = hrs / 24; hrs -= days * 24;

-                        printf(", link uptime=%ud%uh%um%us",days,hrs,min,sec);
+                        ND_PRINT((ndo, ", link uptime=%ud%uh%um%us",days,hrs,min,sec));

                 }
                break;
        default:
                 }
                break;
        default:

-               printf("0x%02x unknown", EXTRACT_32BITS(&slarp->code));
-                if (vflag <= 1)
-                    print_unknown_data(cp+4,"\n\t",length-4);
+               ND_PRINT((ndo, "0x%02x unknown", EXTRACT_32BITS(&slarp->code)));
+                if (ndo->ndo_vflag <= 1)
+                    print_unknown_data(ndo,cp+4,"\n\t",length-4);

                break;
        }
 
                break;
        }
 

-       if (SLARP_MAX_LEN < length && vflag)
-               printf(", (trailing junk: %d bytes)", length - SLARP_MAX_LEN);
-        if (vflag > 1)
-            print_unknown_data(cp+4,"\n\t",length-4);
+       if (SLARP_MAX_LEN < length && ndo->ndo_vflag)
+               ND_PRINT((ndo, ", (trailing junk: %d bytes)", length - SLARP_MAX_LEN));
+        if (ndo->ndo_vflag > 1)
+            print_unknown_data(ndo,cp+4,"\n\t",length-4);

        return;
 
 trunc:
        return;
 
 trunc:

-       printf("[|slarp]");
+       ND_PRINT((ndo, "[|slarp]"));

 }
 
 
 }