Handle very large -f files by rejecting them.

[tcpdump] / print-fddi.c

diff --git a/print-fddi.c b/print-fddi.c
index 04ab0f67072b5e052aa207330c15f879ac4ba9db..27803783b7d8e70b1b09df75554d5237391391bf 100644 (file)
--- a/print-fddi.c
+++ b/print-fddi.c
@@ -19,15 +19,17 @@
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  */
 
+/* \summary: Fiber Distributed Data Interface (FDDI) printer */
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
-#include <tcpdump-stdinc.h>
+#include <netdissect-stdinc.h>
 
 #include <string.h>
 
-#include "interface.h"
+#include "netdissect.h"
 #include "addrtoname.h"
 #include "ether.h"
 
@@ -83,9 +85,9 @@ struct fddi_header {
  * Some FDDI interfaces use bit-swapped addresses.
  */
 #if defined(ultrix) || defined(__alpha) || defined(__bsdi) || defined(__NetBSD__) || defined(__linux__)
-int    fddi_bitswap = 0;
+static int fddi_bitswap = 0;
 #else
-int    fddi_bitswap = 1;
+static int fddi_bitswap = 1;
 #endif
 
 /*
@@ -258,17 +260,11 @@ fddi_hdr_print(netdissect_options *ndo,
        srcname = etheraddr_string(ndo, fsrc);
        dstname = etheraddr_string(ndo, fdst);
 
-       if (ndo->ndo_vflag)
-               ND_PRINT((ndo, "%02x %s %s %d: ",
-                      fddip->fddi_fc,
-                      srcname, dstname,
-                      length));
-       else if (ndo->ndo_qflag)
-               ND_PRINT((ndo, "%s %s %d: ", srcname, dstname, length));
-       else {
+       if (!ndo->ndo_qflag)
                print_fddi_fc(ndo, fddip->fddi_fc);
-               ND_PRINT((ndo, "%s %s %d: ", srcname, dstname, length));
-       }
+       ND_PRINT((ndo, "%s > %s, length %u: ",
+              srcname, dstname,
+              length));
 }
 
 static inline void
@@ -277,16 +273,17 @@ fddi_smt_print(netdissect_options *ndo, const u_char *p _U_, u_int length _U_)
        ND_PRINT((ndo, "<SMT printer not yet implemented>"));
 }
 
-void
+u_int
 fddi_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
 {
        const struct fddi_header *fddip = (const struct fddi_header *)p;
        struct ether_header ehdr;
-       u_short extracted_ethertype;
+       struct lladdr_info src, dst;
+       int llc_hdrlen;
 
        if (caplen < FDDI_HDRLEN) {
                ND_PRINT((ndo, "[|fddi]"));
-               return;
+               return (caplen);
        }
 
        /*
@@ -297,6 +294,11 @@ fddi_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
        if (ndo->ndo_eflag)
                fddi_hdr_print(ndo, fddip, length, ESRC(&ehdr), EDST(&ehdr));
 
+       src.addr = ESRC(&ehdr);
+       src.addr_string = etheraddr_string;
+       dst.addr = EDST(&ehdr);
+       dst.addr_string = etheraddr_string;
+
        /* Skip over FDDI MAC header */
        length -= FDDI_HDRLEN;
        p += FDDI_HDRLEN;
@@ -305,32 +307,29 @@ fddi_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
        /* Frame Control field determines interpretation of packet */
        if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_LLC_ASYNC) {
                /* Try to print the LLC-layer header & higher layers */
-               if (llc_print(ndo, p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
-                   &extracted_ethertype) == 0) {
+               llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst);
+               if (llc_hdrlen < 0) {
                        /*
                         * Some kinds of LLC packet we cannot
                         * handle intelligently
                         */
-                       if (!ndo->ndo_eflag)
-                               fddi_hdr_print(ndo, fddip, length + FDDI_HDRLEN,
-                                   ESRC(&ehdr), EDST(&ehdr));
-                       if (extracted_ethertype) {
-                               ND_PRINT((ndo, "(LLC %s) ",
-                       etherproto_string(htons(extracted_ethertype))));
-                       }
                        if (!ndo->ndo_suppress_default_print)
                                ND_DEFAULTPRINT(p, caplen);
+                       llc_hdrlen = -llc_hdrlen;
                }
-       } else if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_SMT)
+       } else if ((fddip->fddi_fc & FDDIFC_CLFF) == FDDIFC_SMT) {
                fddi_smt_print(ndo, p, caplen);
-       else {
+               llc_hdrlen = 0;
+       } else {
                /* Some kinds of FDDI packet we cannot handle intelligently */
                if (!ndo->ndo_eflag)
                        fddi_hdr_print(ndo, fddip, length + FDDI_HDRLEN, ESRC(&ehdr),
                            EDST(&ehdr));
                if (!ndo->ndo_suppress_default_print)
                        ND_DEFAULTPRINT(p, caplen);
+               llc_hdrlen = 0;
        }
+       return (FDDI_HDRLEN + llc_hdrlen);
 }
 
 /*
@@ -342,7 +341,5 @@ fddi_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
 u_int
 fddi_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p)
 {
-       fddi_print(ndo, p, h->len, h->caplen);
-
-       return (FDDI_HDRLEN);
+       return (fddi_print(ndo, p, h->len, h->caplen));
 }