Handle very large -f files by rejecting them.

[tcpdump] / print-cip.c

diff --git a/print-cip.c b/print-cip.c
index 69c1c3e8a30fa3fa3f1c0e75741ada70387c897a..a123b69f51bf4f619ce9b04dab8924cbe699069d 100644 (file)
--- a/print-cip.c
+++ b/print-cip.c
@@ -1,6 +1,6 @@
 /*
 /*

- * Marko Kiiskila [email protected] 
- * 
+ * Marko Kiiskila [email protected]
+ *

  * Tampere University of Technology - Telecommunications Laboratory
  *
  * Permission to use, copy, modify and distribute this
  * Tampere University of Technology - Telecommunications Laboratory
  *
  * Permission to use, copy, modify and distribute this


@@ -12,46 +12,28 @@
  * documentation, and that the use of this software is
  * acknowledged in any publications resulting from using
  * the software.
  * documentation, and that the use of this software is
  * acknowledged in any publications resulting from using
  * the software.

- * 
+ *

  * TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  * CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS
  * SOFTWARE.
  * TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  * CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS
  * SOFTWARE.

- * 
+ *

  */
 
  */
 

-#ifndef lint
-static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-cip.c,v 1.8 2000-09-28 06:42:57 guy Exp $ (LBL)";
-#endif
+/* \summary: Classical-IP over ATM printer */

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

-#include <sys/param.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <sys/socket.h>
+#include <string.h>

 
 

+#include <netdissect-stdinc.h>

 
 

-#include <netinet/in.h>
-#include <netinet/in_systm.h>
-
-#include <stdio.h>
-#include <pcap.h>
-
-#include "interface.h"
+#include "netdissect.h"

 #include "addrtoname.h"
 #include "addrtoname.h"

-#include "ethertype.h"
-#include "ether.h"
-
-const u_char *packetp;
-const u_char *snapend;
-
-#define RFC1483LLC_LEN 8 

 
 

-static unsigned char rfcllc[] = {
+static const unsigned char rfcllc[] = {

        0xaa,   /* DSAP: non-ISO */
        0xaa,   /* SSAP: non-ISO */
        0x03,   /* Ctrl: Unnumbered Information Command PDU */
        0xaa,   /* DSAP: non-ISO */
        0xaa,   /* SSAP: non-ISO */
        0x03,   /* Ctrl: Unnumbered Information Command PDU */


@@ -60,99 +42,67 @@ static unsigned char rfcllc[] = {
        0x00 };
 
 static inline void
        0x00 };
 
 static inline void

-cip_print(register const u_char *bp, int length)
+cip_print(netdissect_options *ndo, u_int length)

 {
 {

-       int i;
-
-       if (memcmp(rfcllc, bp, sizeof(rfcllc))) {
-               if (qflag) {
-                       for (i = 0;i < RFC1483LLC_LEN; i++)
-                       (void)printf("%2.2x ",bp[i]);
-               } else {
-                       for (i = 0;i < RFC1483LLC_LEN - 2; i++)
-                               (void)printf("%2.2x ",bp[i]);
-                       etherproto_string(((u_short*)bp)[3]);
-               } 
-       } else {
-               if (qflag)
-                       (void)printf("(null encapsulation)");
-               else {
-                       (void)printf("(null encap)");
-                       etherproto_string(ETHERTYPE_IP);
-               }
-       }
+       /*
+        * There is no MAC-layer header, so just print the length.
+        */
+       ND_PRINT((ndo, "%u: ", length));

 }
 
 /*
 }
 
 /*

- * This is the top level routine of the printer.  'p' is the points
- * to the raw header of the packet, 'tvp' is the timestamp,
- * 'length' is the length of the packet off the wire, and 'caplen'
+ * This is the top level routine of the printer.  'p' points
+ * to the LLC/SNAP or raw header of the packet, 'h->ts' is the timestamp,
+ * 'h->len' is the length of the packet off the wire, and 'h->caplen'

  * is the number of bytes actually captured.
  */
  * is the number of bytes actually captured.
  */

-void
-cip_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
+u_int
+cip_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)

 {
 {

-       int caplen = h->caplen;
-       int length = h->len;
-       u_short ether_type;
-       u_short extracted_ethertype;
-       u_short *bp;
-
-       ts_print(&h->ts);
-
-       if (memcmp(rfcllc, p, sizeof(rfcllc))==0 && caplen < RFC1483LLC_LEN) {
-               printf("[|cip]");
-               goto out;
+       u_int caplen = h->caplen;
+       u_int length = h->len;
+       size_t cmplen;
+       int llc_hdrlen;
+
+       cmplen = sizeof(rfcllc);
+       if (cmplen > caplen)
+               cmplen = caplen;
+       if (cmplen > length)
+               cmplen = length;
+
+       if (ndo->ndo_eflag)
+               cip_print(ndo, length);
+
+       if (cmplen == 0) {
+               ND_PRINT((ndo, "[|cip]"));
+               return 0;

        }
        }

-
-       if (eflag)
-               cip_print(p, length);
-
-       /*
-        * Some printers want to get back at the ethernet 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 (memcmp(rfcllc, p, sizeof(rfcllc))==0) {
-               length -= RFC1483LLC_LEN;
-               caplen -= RFC1483LLC_LEN;
-               bp = (u_short *)p;
-               p += RFC1483LLC_LEN;
-               ether_type = ntohs(bp[3]);
+       if (memcmp(rfcllc, p, cmplen) == 0) {
+               /*
+                * LLC header is present.  Try to print it & higher layers.
+                */
+               llc_hdrlen = llc_print(ndo, p, length, caplen, NULL, NULL);
+               if (llc_hdrlen < 0) {
+                       /* packet type not known, print raw packet */
+                       if (!ndo->ndo_suppress_default_print)
+                               ND_DEFAULTPRINT(p, caplen);
+                       llc_hdrlen = -llc_hdrlen;
+               }

        } else {
        } else {

-               ether_type = ETHERTYPE_IP;
-               bp = (u_short *)p;
+               /*
+                * LLC header is absent; treat it as just IP.
+                */
+               llc_hdrlen = 0;
+               ip_print(ndo, p, length);

        }
 
        }
 

-       /*
-        * Is it (gag) an 802.3 encapsulation?
-        */
-       extracted_ethertype = 0;
-       if (ether_type < ETHERMTU) {
-               /* Try to print the LLC-layer header & higher layers */
-               if (llc_print(p, length, caplen, NULL, NULL)==0) {
-                       /* ether_type not known, print raw packet */
-                       if (!eflag)
-                               cip_print((u_char *)bp, length);
-                       if (extracted_ethertype) {
-                               printf("(LLC %s) ",
-                              etherproto_string(htons(extracted_ethertype)));
-                       }
-                       if (!xflag && !qflag)
-                               default_print(p, caplen);
-               }
-       } else if (ether_encap_print(ether_type, p, length, caplen) == 0) {
-               /* ether_type not known, print raw packet */
-               if (!eflag)
-                       cip_print((u_char *)bp, length + RFC1483LLC_LEN);
-               if (!xflag && !qflag)
-                       default_print(p, caplen);
-       }
-       if (xflag)
-               default_print(p, caplen);
- out:
-       putchar('\n');
+       return (llc_hdrlen);

 }
 }

+
+
+/*
+ * Local Variables:
+ * c-style: whitesmith
+ * c-basic-offset: 8
+ * End:
+ */