Replace ND_TCHECK_/memcpy() pairs with GET_CPY_BYTES().

For BGP, this eliminates some cases where routines return -1 on
truncation; clean up after that.

This also means that some memcpy()s get replaced by UNALIGNED_MEMCPY(),
which may fix some issues on processors that don't support unaligned
accesses.

5 files changed, 16 insertions, 71 deletions

diff --git a/print-bgp.c b/print-bgp.c
index 5de10032..9688a4ed 100644
--- a/print-bgp.c
+++ b/print-bgp.c
@@ -598,20 +598,16 @@ decode_prefix4(netdissect_options *ndo,
 
     memset(&addr, 0, sizeof(addr));
     plenbytes = (plen + 7) / 8;
-    ND_TCHECK_LEN(pptr + 1, plenbytes);
     ITEMCHECK(plenbytes);
-    memcpy(&addr, pptr + 1, plenbytes);
+    GET_CPY_BYTES(&addr, pptr + 1, plenbytes);
     if (plen % 8) {
         ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
     }
     snprintf(buf, buflen, "%s/%u", ipaddr_string(ndo, (const u_char *)&addr), plen);
     return 1 + plenbytes;
 
-trunc:
-    return -2;
-
 badtlv:
-    return -3;
+    return -2;
 }
 
 static int
@@ -646,9 +642,8 @@ decode_labeled_prefix4(netdissect_options *ndo,
 
     memset(&addr, 0, sizeof(addr));
     plenbytes = (plen + 7) / 8;
-    ND_TCHECK_LEN(pptr + 4, plenbytes);
     ITEMCHECK(plenbytes);
-    memcpy(&addr, pptr + 4, plenbytes);
+    GET_CPY_BYTES(&addr, pptr + 4, plenbytes);
     if (plen % 8) {
         ((u_char *)&addr)[plenbytes - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
     }
@@ -1030,8 +1025,7 @@ decode_rt_routing_info(netdissect_options *ndo,
      */
     memset(&route_target, 0, sizeof(route_target));
     num_octets = (plen + 7) / 8;
-    ND_TCHECK_LEN(pptr + 5, num_octets);
-    memcpy(&route_target, pptr + 5, num_octets);
+    GET_CPY_BYTES(&route_target, pptr + 5, num_octets);
     /* If mask-len is not on octet boundary, ensure all extra bits are 0 */
     if (plen % 8) {
         ((u_char *)&route_target)[num_octets - 1] &=
@@ -1042,8 +1036,6 @@ decode_rt_routing_info(netdissect_options *ndo,
              bgp_rt_prefix_print(ndo, (u_char *)&route_target, plen));
 
     return 5 + num_octets;
-trunc:
-    return -2;
 }
 
 static int
@@ -1064,8 +1056,7 @@ decode_labeled_vpn_prefix4(netdissect_options *ndo,
         return -1;
 
     memset(&addr, 0, sizeof(addr));
-    ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
-    memcpy(&addr, pptr + 12, (plen + 7) / 8);
+    GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
     if (plen % 8) {
         ((u_char *)&addr)[(plen + 7) / 8 - 1] &=
             ((0xff00 >> (plen % 8)) & 0xff);
@@ -1079,9 +1070,6 @@ decode_labeled_vpn_prefix4(netdissect_options *ndo,
                 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
 
     return 12 + (plen + 7) / 8;
-
-trunc:
-    return -2;
 }
 
 /*
@@ -1381,9 +1369,8 @@ decode_prefix6(netdissect_options *ndo,
 
     memset(&addr, 0, sizeof(addr));
     plenbytes = (plen + 7) / 8;
-    ND_TCHECK_LEN(pd + 1, plenbytes);
     ITEMCHECK(plenbytes);
-    memcpy(&addr, pd + 1, plenbytes);
+    GET_CPY_BYTES(&addr, pd + 1, plenbytes);
     if (plen % 8) {
         addr[plenbytes - 1] &=
             ((0xff00 >> (plen % 8)) & 0xff);
@@ -1391,11 +1378,8 @@ decode_prefix6(netdissect_options *ndo,
     snprintf(buf, buflen, "%s/%u", ip6addr_string(ndo, (const u_char *)&addr), plen);
     return 1 + plenbytes;
 
-trunc:
-    return -2;
-
 badtlv:
-    return -3;
+    return -2;
 }
 
 static int
@@ -1421,8 +1405,7 @@ decode_labeled_prefix6(netdissect_options *ndo,
 
     memset(&addr, 0, sizeof(addr));
     plenbytes = (plen + 7) / 8;
-    ND_TCHECK_LEN(pptr + 4, plenbytes);
-    memcpy(&addr, pptr + 4, plenbytes);
+    GET_CPY_BYTES(&addr, pptr + 4, plenbytes);
     if (plen % 8) {
         addr[plenbytes - 1] &=
             ((0xff00 >> (plen % 8)) & 0xff);
@@ -1461,8 +1444,7 @@ decode_labeled_vpn_prefix6(netdissect_options *ndo,
         return -1;
 
     memset(&addr, 0, sizeof(addr));
-    ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
-    memcpy(&addr, pptr + 12, (plen + 7) / 8);
+    GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
     if (plen % 8) {
         addr[(plen + 7) / 8 - 1] &=
             ((0xff00 >> (plen % 8)) & 0xff);
@@ -1476,9 +1458,6 @@ decode_labeled_vpn_prefix6(netdissect_options *ndo,
                 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
 
     return 12 + (plen + 7) / 8;
-
-trunc:
-    return -2;
 }
 
 static int
@@ -1494,8 +1473,7 @@ decode_clnp_prefix(netdissect_options *ndo,
         return -1;
 
     memset(&addr, 0, sizeof(addr));
-    ND_TCHECK_LEN(pptr + 4, (plen + 7) / 8);
-    memcpy(&addr, pptr + 4, (plen + 7) / 8);
+    GET_CPY_BYTES(&addr, pptr + 4, (plen + 7) / 8);
     if (plen % 8) {
         addr[(plen + 7) / 8 - 1] &=
             ((0xff00 >> (plen % 8)) & 0xff);
@@ -1506,9 +1484,6 @@ decode_clnp_prefix(netdissect_options *ndo,
                 plen);
 
     return 1 + (plen + 7) / 8;
-
-trunc:
-    return -2;
 }
 
 static int
@@ -1529,8 +1504,7 @@ decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
         return -1;
 
     memset(&addr, 0, sizeof(addr));
-    ND_TCHECK_LEN(pptr + 12, (plen + 7) / 8);
-    memcpy(&addr, pptr + 12, (plen + 7) / 8);
+    GET_CPY_BYTES(&addr, pptr + 12, (plen + 7) / 8);
     if (plen % 8) {
         addr[(plen + 7) / 8 - 1] &= ((0xff00 >> (plen % 8)) & 0xff);
     }
@@ -1544,9 +1518,6 @@ decode_labeled_vpn_clnp_prefix(netdissect_options *ndo,
                 ((GET_U_1(pptr + 3) & 1) == 0) ? "(BOGUS: Bottom of Stack NOT set!)" : "(bottom)" );
 
     return 12 + (plen + 7) / 8;
-
-trunc:
-    return -2;
 }
 
 /*
@@ -1753,8 +1724,6 @@ bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi,
                 if (advance == -1)
                     ND_PRINT("\n\t    (illegal prefix length)");
                 else if (advance == -2)
-                    goto trunc;
-                else if (advance == -3)
                     break; /* bytes left, but not enough */
                 else
                     ND_PRINT("\n\t      %s", buf);
@@ -1780,15 +1749,11 @@ bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi,
                 advance = decode_labeled_vpn_prefix4(ndo, tptr, buf, buflen);
                 if (advance == -1)
                     ND_PRINT("\n\t    (illegal prefix length)");
-                else if (advance == -2)
-                    goto trunc;
                 else
                     ND_PRINT("\n\t      %s", buf);
                 break;
             case (AFNUM_INET<<8 | SAFNUM_RT_ROUTING_INFO):
                 advance = decode_rt_routing_info(ndo, tptr);
-                if (advance == -2)
-                    goto trunc;
                 break;
             case (AFNUM_INET<<8 | SAFNUM_MULTICAST_VPN): /* fall through */
             case (AFNUM_INET6<<8 | SAFNUM_MULTICAST_VPN):
@@ -1821,8 +1786,6 @@ bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi,
                 if (advance == -1)
                     ND_PRINT("\n\t    (illegal prefix length)");
                 else if (advance == -2)
-                    goto trunc;
-                else if (advance == -3)
                     break; /* bytes left, but not enough */
                 else
                     ND_PRINT("\n\t      %s", buf);
@@ -1848,8 +1811,6 @@ bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi,
                 advance = decode_labeled_vpn_prefix6(ndo, tptr, buf, buflen);
                 if (advance == -1)
                     ND_PRINT("\n\t    (illegal prefix length)");
-                else if (advance == -2)
-                    goto trunc;
                 else
                     ND_PRINT("\n\t      %s", buf);
                 break;
@@ -1871,8 +1832,6 @@ bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi,
                 advance = decode_clnp_prefix(ndo, tptr, buf, buflen);
                 if (advance == -1)
                     ND_PRINT("\n\t    (illegal prefix length)");
-                else if (advance == -2)
-                    goto trunc;
                 else
                     ND_PRINT("\n\t      %s", buf);
                 break;
@@ -1882,8 +1841,6 @@ bgp_nlri_print(netdissect_options *ndo, uint16_t af, uint8_t safi,
                 advance = decode_labeled_vpn_clnp_prefix(ndo, tptr, buf, buflen);
                 if (advance == -1)
                     ND_PRINT("\n\t    (illegal prefix length)");
-                else if (advance == -2)
-                    goto trunc;
                 else
                     ND_PRINT("\n\t      %s", buf);
                 break;
@@ -2800,8 +2757,6 @@ bgp_update_print(netdissect_options *ndo,
                 ND_PRINT("\n\t    (illegal prefix length)");
                 break;
             } else if (wpfx == -2)
-                goto trunc;
-            else if (wpfx == -3)
                 goto trunc; /* bytes left, but not enough */
             else {
                 ND_PRINT("\n\t    %s", buf);
@@ -2917,8 +2872,6 @@ bgp_update_print(netdissect_options *ndo,
                 ND_PRINT("\n\t    (illegal prefix length)");
                 break;
             } else if (i == -2)
-                goto trunc;
-            else if (i == -3)
                 goto trunc; /* bytes left, but not enough */
             else {
                 ND_PRINT("\n\t    %s", buf);
diff --git a/print-domain.c b/print-domain.c
index 74c71dba..c3c6fd8f 100644
--- a/print-domain.c
+++ b/print-domain.c
@@ -796,10 +796,8 @@ ns_rprint(netdissect_options *ndo,
 			ND_PRINT(" %u(bad plen)", pbit);
 			break;
 		} else if (pbit < 128) {
-			if (!ND_TTEST_LEN(cp + 1, sizeof(a) - pbyte))
-				return(NULL);
 			memset(a, 0, sizeof(a));
-			memcpy(a + pbyte, cp + 1, sizeof(a) - pbyte);
+			GET_CPY_BYTES(a + pbyte, cp + 1, sizeof(a) - pbyte);
 			ND_PRINT(" %u %s", pbit,
 			    addrtostr6(&a, ntop_buf, sizeof(ntop_buf)));
 		}
diff --git a/print-icmp6.c b/print-icmp6.c
index ba1f6e61..f16c1fa9 100644
--- a/print-icmp6.c
+++ b/print-icmp6.c
@@ -1514,12 +1514,10 @@ icmp6_opt_print(netdissect_options *ndo, const u_char *bp, int resid)
 			case 1:
 				break;
 			case 2:
-				ND_TCHECK_8(opri + 1);
-				memcpy(&in6, opri + 1, 8);
+				GET_CPY_BYTES(&in6, opri + 1, 8);
 				break;
 			case 3:
-				ND_TCHECK_16(opri + 1);
-				memcpy(&in6, opri + 1, 16);
+				GET_CPY_BYTES(&in6, opri + 1, 16);
 				break;
 			default:
 				goto trunc;
diff --git a/print-isoclns.c b/print-isoclns.c
index 3b4a1502..ddd55953 100644
--- a/print-isoclns.c
+++ b/print-isoclns.c
@@ -2307,9 +2307,8 @@ isis_print_extd_ip_reach(netdissect_options *ndo,
 
     byte_length = (bit_length + 7) / 8; /* prefix has variable length encoding */
 
-    ND_TCHECK_LEN(tptr, byte_length);
     memset(prefix, 0, sizeof(prefix));   /* clear the copy buffer */
-    memcpy(prefix,tptr,byte_length);    /* copy as much as is stored in the TLV */
+    GET_CPY_BYTES(prefix,tptr,byte_length);    /* copy as much as is stored in the TLV */
     tptr+=byte_length;
     processed+=byte_length;
 
@@ -2360,8 +2359,6 @@ isis_print_extd_ip_reach(netdissect_options *ndo,
         }
     }
     return (processed);
-trunc:
-    return 0;
 }
 
 static void
diff --git a/print-ospf6.c b/print-ospf6.c
index 1b862b30..1bdcd681 100644
--- a/print-ospf6.c
+++ b/print-ospf6.c
@@ -425,9 +425,8 @@ ospf6_print_lsaprefix(netdissect_options *ndo,
 	if (lsa_length < wordlen * 4)
 		goto trunc;
 	lsa_length -= wordlen * 4;
-	ND_TCHECK_LEN(lsapp->lsa_p_prefix, wordlen * 4);
 	memset(prefix, 0, sizeof(prefix));
-	memcpy(prefix, lsapp->lsa_p_prefix, wordlen * 4);
+	GET_CPY_BYTES(prefix, lsapp->lsa_p_prefix, wordlen * 4);
 	ND_PRINT("\n\t\t%s/%u", ip6addr_string(ndo, prefix), /* local buffer, not packet data; don't use GET_IP6ADDR_STRING() */
 		 GET_U_1(lsapp->lsa_p_len));
         if (GET_U_1(lsapp->lsa_p_opt)) {