Handle very large -f files by rejecting them.

[tcpdump] / print-lisp.c

diff --git a/print-lisp.c b/print-lisp.c
index 6b5b8151ce1c87ecf1b2966eb7b13d74c9bf8d49..47afe503596c5a06a630ab7b103856839a1e13ce 100644 (file)
--- a/print-lisp.c
+++ b/print-lisp.c
@@ -26,9 +26,10 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+/* \summary: - Locator/Identifier Separation Protocol (LISP) printer */
+
 /*
- * tcpdump filter for LISP - Locator/Identifier Separation Protocol
- * RFC 6830
+ * specification: RFC 6830
  *
  *
  * The Map-Register message format is:
@@ -93,7 +94,6 @@
  *  +-> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  */
 
-
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
@@ -109,6 +109,8 @@
 #include "extract.h"
 #include "addrtoname.h"
 
+static const char tstr[] = " [|LISP]";
+
 #define IPv4_AFI                       1
 #define IPv6_AFI                       2
 #define TYPE_INDEX                     4
@@ -186,38 +188,38 @@ static const struct tok lisp_loc_flag[] = {
 };
 
 typedef struct map_register_hdr {
-       uint8_t type_and_flag;
-       uint8_t reserved;
-       uint8_t reserved_and_flag2;
-       uint8_t record_count;
-       uint64_t nonce;
-       uint16_t key_id;
-       uint16_t auth_data_len;
-} UNALIGNED lisp_map_register_hdr;
+       nd_uint8_t type_and_flag;
+       nd_uint8_t reserved;
+       nd_uint8_t reserved_and_flag2;
+       nd_uint8_t record_count;
+       nd_uint64_t nonce;
+       nd_uint16_t key_id;
+       nd_uint16_t auth_data_len;
+} lisp_map_register_hdr;
 
 #define MAP_REGISTER_HDR_LEN sizeof(lisp_map_register_hdr)
 
 typedef struct map_register_eid {
-       uint32_t ttl;
-       uint8_t locator_count;
-       uint8_t eid_prefix_mask_length;
-       uint8_t act_auth_inc_res;
-       uint8_t reserved;
-       uint8_t reserved_version_hi;
-       uint8_t version_low;
-       uint16_t eid_prefix_afi;
-} UNALIGNED lisp_map_register_eid;
+       nd_uint32_t ttl;
+       nd_uint8_t locator_count;
+       nd_uint8_t eid_prefix_mask_length;
+       nd_uint8_t act_auth_inc_res;
+       nd_uint8_t reserved;
+       nd_uint8_t reserved_version_hi;
+       nd_uint8_t version_low;
+       nd_uint16_t eid_prefix_afi;
+} lisp_map_register_eid;
 
 #define MAP_REGISTER_EID_LEN sizeof(lisp_map_register_eid)
 
 typedef struct map_register_loc {
-       uint8_t priority;
-       uint8_t weight;
-       uint8_t m_priority;
-       uint8_t m_weight;
-       uint16_t unused_and_flag;
-       uint16_t locator_afi;
-} UNALIGNED lisp_map_register_loc;
+       nd_uint8_t priority;
+       nd_uint8_t weight;
+       nd_uint8_t m_priority;
+       nd_uint8_t m_weight;
+       nd_uint16_t unused_and_flag;
+       nd_uint16_t locator_afi;
+} lisp_map_register_loc;
 
 #define MAP_REGISTER_LOC_LEN sizeof(lisp_map_register_loc)
 
@@ -278,7 +280,7 @@ void lisp_print(netdissect_options *ndo, const u_char *bp, u_int length)
        packet_offset += auth_data_len;
 
        if (record_count == 0)
-               goto malformed;
+               goto invalid;
 
        /* Print all the EID records */
        while ((length > packet_offset) && (record_count--)) {
@@ -304,13 +306,13 @@ void lisp_print(netdissect_options *ndo, const u_char *bp, u_int length)
                switch (eid_afi) {
                case IPv4_AFI:
                        ND_TCHECK2(*(packet_iterator + packet_offset), 4);
-                       ND_PRINT((ndo, " EID %s/%u,", getname(ndo,
+                       ND_PRINT((ndo, " EID %s/%u,", ipaddr_string(ndo,
                                packet_iterator + packet_offset), mask_len));
                        packet_offset += 4;
                        break;
                case IPv6_AFI:
                        ND_TCHECK2(*(packet_iterator + packet_offset), 16);
-                       ND_PRINT((ndo, " EID %s/%u,", getname6(ndo,
+                       ND_PRINT((ndo, " EID %s/%u,", ip6addr_string(ndo,
                                packet_iterator + packet_offset), mask_len));
                        packet_offset += 16;
                        break;
@@ -337,12 +339,12 @@ void lisp_print(netdissect_options *ndo, const u_char *bp, u_int length)
                        switch (loc_afi) {
                        case IPv4_AFI:
                                ND_TCHECK2(*(packet_iterator + packet_offset), 4);
-                               ND_PRINT((ndo, " LOC %s", getname(ndo, loc_ip_pointer)));
+                               ND_PRINT((ndo, " LOC %s", ipaddr_string(ndo, loc_ip_pointer)));
                                packet_offset += 4;
                                break;
                        case IPv6_AFI:
                                ND_TCHECK2(*(packet_iterator + packet_offset), 16);
-                               ND_PRINT((ndo, " LOC %s", getname6(ndo, loc_ip_pointer)));
+                               ND_PRINT((ndo, " LOC %s", ip6addr_string(ndo, loc_ip_pointer)));
                                packet_offset += 16;
                                break;
                        default:
@@ -359,13 +361,13 @@ void lisp_print(netdissect_options *ndo, const u_char *bp, u_int length)
        }
 
        /*
-        * Print xTR and Site ID. Handle the fact that the packet could be malformed.
+        * Print xTR and Site ID. Handle the fact that the packet could be invalid.
         * If the xTR_ID_Present bit is not set, and we still have data to display,
         * show it as hex data.
         */
        if (xtr_present) {
                if (!ND_TTEST2(*(packet_iterator + packet_offset), 24))
-                       goto malformed;
+                       goto invalid;
                hex_print_with_offset(ndo, "\n    xTR-ID: ", packet_iterator + packet_offset, 16, 0);
                ND_PRINT((ndo, "\n    SITE-ID: %" PRIu64,
                        EXTRACT_64BITS(packet_iterator + packet_offset + 16)));
@@ -378,14 +380,13 @@ void lisp_print(netdissect_options *ndo, const u_char *bp, u_int length)
        }
        return;
 trunc:
-       ND_PRINT((ndo, "\n    [|LISP]"));
+       ND_PRINT((ndo, "\n   %s", tstr));
        return;
-malformed:
-       ND_PRINT((ndo, "\n    (malformed-packet)"));
+invalid:
+       ND_PRINT((ndo, "\n   %s", istr));
        return;
 }
 
-
 static inline uint8_t extract_lisp_type(uint8_t lisp_hdr_flags)
 {
        return (lisp_hdr_flags) >> TYPE_INDEX;
@@ -425,7 +426,6 @@ static void lisp_hdr_flag(netdissect_options *ndo, const lisp_map_register_hdr *
        return;
 }
 
-
 static void action_flag(netdissect_options *ndo, uint8_t act_auth_inc_res)
 {
        uint8_t action;
@@ -442,7 +442,6 @@ static void action_flag(netdissect_options *ndo, uint8_t act_auth_inc_res)
        ND_PRINT((ndo, " %s,", tok2str(lisp_eid_action, "unknown", action)));
 }
 
-
 static void loc_hdr_flag(netdissect_options *ndo, uint16_t flag)
 {
        ND_PRINT((ndo, " flags [%s],", bittok2str(lisp_loc_flag, "none", flag)));