CVE-2017-13040/MPTCP: Clean up printing DSS suboption.

[tcpdump] / print-atalk.c

diff --git a/print-atalk.c b/print-atalk.c
index 2816bfafa13edae6363489001cdc349d59df9ad4..9d7d69d3d790189f01ca5d430980b98d021d2ac4 100644 (file)
--- a/print-atalk.c
+++ b/print-atalk.c
@@ -17,24 +17,23 @@
  * 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.
- *
- * Format and print AppleTalk packets.
  */
 
-#define NETDISSECT_REWORKED
+/* \summary: AppleTalk printer */
+
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
-#include <tcpdump-stdinc.h>
+#include <netdissect-stdinc.h>
 
 #include <stdio.h>
 #include <string.h>
 
-#include "interface.h"
+#include "netdissect.h"
 #include "addrtoname.h"
 #include "ethertype.h"
-#include "extract.h"                   /* must come after interface.h */
+#include "extract.h"
 #include "appletalk.h"
 
 static const char tstr[] = "[|atalk]";
@@ -51,12 +50,12 @@ static const struct tok type2str[] = {
 
 struct aarp {
        uint16_t        htype, ptype;
-       uint8_t halen, palen;
+       uint8_t         halen, palen;
        uint16_t        op;
-       uint8_t hsaddr[6];
-       uint8_t psaddr[4];
-       uint8_t hdaddr[6];
-       uint8_t pdaddr[4];
+       uint8_t         hsaddr[6];
+       uint8_t         psaddr[4];
+       uint8_t         hdaddr[6];
+       uint8_t         pdaddr[4];
 };
 
 static void atp_print(netdissect_options *, const struct atATP *, u_int);
@@ -78,7 +77,14 @@ u_int
 ltalk_if_print(netdissect_options *ndo,
                const struct pcap_pkthdr *h, const u_char *p)
 {
-       return (llap_print(ndo, p, h->caplen));
+       u_int hdrlen;
+
+       hdrlen = llap_print(ndo, p, h->len);
+       if (hdrlen == 0) {
+               /* Cut short by the snapshot length. */
+               return (h->caplen);
+       }
+       return (hdrlen);
 }
 
 /*
@@ -98,6 +104,10 @@ llap_print(netdissect_options *ndo,
                ND_PRINT((ndo, " [|llap %u]", length));
                return (length);
        }
+       if (!ND_TTEST2(*bp, sizeof(*lp))) {
+               ND_PRINT((ndo, " [|llap]"));
+               return (0);     /* cut short by the snapshot length */
+       }
        lp = (const struct LAP *)bp;
        bp += sizeof(*lp);
        length -= sizeof(*lp);
@@ -109,6 +119,10 @@ llap_print(netdissect_options *ndo,
                        ND_PRINT((ndo, " [|sddp %u]", length));
                        return (length);
                }
+               if (!ND_TTEST2(*bp, ddpSSize)) {
+                       ND_PRINT((ndo, " [|sddp]"));
+                       return (0);     /* cut short by the snapshot length */
+               }
                sdp = (const struct atShortDDP *)bp;
                ND_PRINT((ndo, "%s.%s",
                    ataddr_string(ndo, 0, lp->src), ddpskt_string(ndo, sdp->srcSkt)));
@@ -125,6 +139,10 @@ llap_print(netdissect_options *ndo,
                        ND_PRINT((ndo, " [|ddp %u]", length));
                        return (length);
                }
+               if (!ND_TTEST2(*bp, ddpSize)) {
+                       ND_PRINT((ndo, " [|ddp]"));
+                       return (0);     /* cut short by the snapshot length */
+               }
                dp = (const struct atDDP *)bp;
                snet = EXTRACT_16BITS(&dp->srcNet);
                ND_PRINT((ndo, "%s.%s", ataddr_string(ndo, snet, dp->srcNode),
@@ -171,6 +189,10 @@ atalk_print(netdissect_options *ndo,
                ND_PRINT((ndo, " [|ddp %u]", length));
                return;
        }
+       if (!ND_TTEST2(*bp, ddpSize)) {
+               ND_PRINT((ndo, " [|ddp]"));
+               return;
+       }
        dp = (const struct atDDP *)bp;
        snet = EXTRACT_16BITS(&dp->srcNet);
        ND_PRINT((ndo, "%s.%s", ataddr_string(ndo, snet, dp->srcNode),
@@ -194,6 +216,15 @@ aarp_print(netdissect_options *ndo,
 
        ND_PRINT((ndo, "aarp "));
        ap = (const struct aarp *)bp;
+       if (!ND_TTEST(*ap)) {
+               /* Just bail if we don't have the whole chunk. */
+               ND_PRINT((ndo, " [|aarp]"));
+               return;
+       }
+       if (length < sizeof(*ap)) {
+               ND_PRINT((ndo, " [|aarp %u]", length));
+               return;
+       }
        if (EXTRACT_16BITS(&ap->htype) == 1 &&
            EXTRACT_16BITS(&ap->ptype) == ETHERTYPE_ATALK &&
            ap->halen == 6 && ap->palen == 4 )
@@ -380,7 +411,7 @@ nbp_print(netdissect_options *ndo,
           register u_char snode, register u_char skt)
 {
        register const struct atNBPtuple *tp =
-               (const struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
+               (const struct atNBPtuple *)((const u_char *)np + nbpHeaderSize);
        int i;
        const u_char *ep;
 
@@ -567,8 +598,11 @@ ataddr_string(netdissect_options *ndo,
                             tp->nxt; tp = tp->nxt)
                                ;
                        tp->addr = i2;
-                       tp->nxt = newhnamemem();
+                       tp->nxt = newhnamemem(ndo);
                        tp->name = strdup(nambuf);
+                       if (tp->name == NULL)
+                               (*ndo->ndo_error)(ndo,
+                                                 "ataddr_string: strdup(nambuf)");
                }
                fclose(fp);
        }
@@ -582,20 +616,25 @@ ataddr_string(netdissect_options *ndo,
        for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
                if (tp2->addr == i) {
                        tp->addr = (atnet << 8) | athost;
-                       tp->nxt = newhnamemem();
+                       tp->nxt = newhnamemem(ndo);
                        (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
                            tp2->name, athost);
                        tp->name = strdup(nambuf);
+                       if (tp->name == NULL)
+                               (*ndo->ndo_error)(ndo,
+                                                 "ataddr_string: strdup(nambuf)");
                        return (tp->name);
                }
 
        tp->addr = (atnet << 8) | athost;
-       tp->nxt = newhnamemem();
+       tp->nxt = newhnamemem(ndo);
        if (athost != 255)
                (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet, athost);
        else
                (void)snprintf(nambuf, sizeof(nambuf), "%d", atnet);
        tp->name = strdup(nambuf);
+       if (tp->name == NULL)
+               (*ndo->ndo_error)(ndo, "ataddr_string: strdup(nambuf)");
 
        return (tp->name);
 }