ospf6d: make some old sizing checks assertions
As long as ospf6_packet_examin() is now the single checkpoint for
received packets, most of the old checks performed elsewhere can
be converted into assert() constructs. Malformed input data at
respective points can be attributed solely to a programming error,
not a malformed packet.
* ospf6_message.c
* ospf6_hello_print()
* ospf6_dbdesc_print()
* ospf6_lsreq_print()
* ospf6_lsupdate_print()
* ospf6_lsack_print()
* ospf6_hello_recv()
* ospf6_dbdesc_recv_master()
* ospf6_dbdesc_recv_slave()
* ospf6_lsreq_recv()
* ospf6_lsupdate_recv()
* ospf6_lsupdate_recv()
* ospf6_lsack_recv()
* ospf6_receive()
diff --git a/ospf6d/ospf6_message.c b/ospf6d/ospf6_message.c
index 362e8a9..5760874 100644
--- a/ospf6d/ospf6_message.c
+++ b/ospf6d/ospf6_message.c
@@ -128,8 +128,7 @@
zlog_debug (" Neighbor: %s", neighbor);
}
- if (p != OSPF6_MESSAGE_END (oh))
- zlog_debug ("Trailing garbage exists");
+ assert (p == OSPF6_MESSAGE_END (oh));
}
void
@@ -161,8 +160,7 @@
p += sizeof (struct ospf6_lsa_header))
ospf6_lsa_header_print_raw ((struct ospf6_lsa_header *) p);
- if (p != OSPF6_MESSAGE_END (oh))
- zlog_debug ("Trailing garbage exists");
+ assert (p == OSPF6_MESSAGE_END (oh));
}
void
@@ -185,8 +183,7 @@
ospf6_lstype_name (e->type), id, adv_router);
}
- if (p != OSPF6_MESSAGE_END (oh))
- zlog_debug ("Trailing garbage exists");
+ assert (p == OSPF6_MESSAGE_END (oh));
}
void
@@ -211,35 +208,9 @@
p += OSPF6_LSA_SIZE (p))
{
ospf6_lsa_header_print_raw ((struct ospf6_lsa_header *) p);
- if (OSPF6_LSA_SIZE (p) < sizeof (struct ospf6_lsa_header))
- {
- zlog_debug (" Malformed LSA length, quit printing");
- break;
- }
}
- if (p != OSPF6_MESSAGE_END (oh))
- {
- char buf[32];
-
- int num = 0;
- memset (buf, 0, sizeof (buf));
-
- zlog_debug (" Trailing garbage exists");
- while (p < OSPF6_MESSAGE_END (oh))
- {
- snprintf (buf, sizeof (buf), "%s %2x", buf, *p++);
- num++;
- if (num == 8)
- {
- zlog_debug (" %s", buf);
- memset (buf, 0, sizeof (buf));
- num = 0;
- }
- }
- if (num)
- zlog_debug (" %s", buf);
- }
+ assert (p == OSPF6_MESSAGE_END (oh));
}
void
@@ -255,8 +226,7 @@
p += sizeof (struct ospf6_lsa_header))
ospf6_lsa_header_print_raw ((struct ospf6_lsa_header *) p);
- if (p != OSPF6_MESSAGE_END (oh))
- zlog_debug ("Trailing garbage exists");
+ assert (p == OSPF6_MESSAGE_END (oh));
}
static void
@@ -323,11 +293,7 @@
twoway++;
}
- if (p != OSPF6_MESSAGE_END (oh))
- {
- if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
- zlog_debug ("Trailing garbage ignored");
- }
+ assert (p == OSPF6_MESSAGE_END (oh));
/* RouterPriority check */
if (on->priority != hello->priority)
@@ -560,11 +526,7 @@
}
}
- if (p != OSPF6_MESSAGE_END (oh))
- {
- if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
- zlog_debug ("Trailing garbage ignored");
- }
+ assert (p == OSPF6_MESSAGE_END (oh));
/* Increment sequence number */
on->dbdesc_seqnum ++;
@@ -772,11 +734,7 @@
ospf6_lsa_delete (his);
}
- if (p != OSPF6_MESSAGE_END (oh))
- {
- if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
- zlog_debug ("Trailing garbage ignored");
- }
+ assert (p == OSPF6_MESSAGE_END (oh));
/* Set sequence number to Master's */
on->dbdesc_seqnum = ntohl (dbdesc->seqnum);
@@ -912,11 +870,7 @@
ospf6_lsdb_add (ospf6_lsa_copy (lsa), on->lsupdate_list);
}
- if (p != OSPF6_MESSAGE_END (oh))
- {
- if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
- zlog_debug ("Trailing garbage ignored");
- }
+ assert (p == OSPF6_MESSAGE_END (oh));
/* schedule send lsupdate */
THREAD_OFF (on->thread_send_lsupdate);
@@ -1357,7 +1311,6 @@
{
struct ospf6_neighbor *on;
struct ospf6_lsupdate *lsupdate;
- unsigned long num;
char *p;
on = ospf6_neighbor_lookup (oh->router_id, oi);
@@ -1380,37 +1333,16 @@
lsupdate = (struct ospf6_lsupdate *)
((caddr_t) oh + sizeof (struct ospf6_header));
- num = ntohl (lsupdate->lsa_number);
-
/* Process LSAs */
for (p = (char *) ((caddr_t) lsupdate + sizeof (struct ospf6_lsupdate));
p < OSPF6_MESSAGE_END (oh) &&
p + OSPF6_LSA_SIZE (p) <= OSPF6_MESSAGE_END (oh);
p += OSPF6_LSA_SIZE (p))
{
- if (num == 0)
- break;
- if (OSPF6_LSA_SIZE (p) < sizeof (struct ospf6_lsa_header))
- {
- if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
- zlog_debug ("Malformed LSA length, quit processing");
- break;
- }
-
ospf6_receive_lsa (on, (struct ospf6_lsa_header *) p);
- num--;
}
- if (num != 0)
- {
- if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
- zlog_debug ("Malformed LSA number or LSA length");
- }
- if (p != OSPF6_MESSAGE_END (oh))
- {
- if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
- zlog_debug ("Trailing garbage ignored");
- }
+ assert (p == OSPF6_MESSAGE_END (oh));
/* RFC2328 Section 10.9: When the neighbor responds to these requests
with the proper Link State Update packet(s), the Link state request
@@ -1526,11 +1458,7 @@
ospf6_lsa_delete (his);
}
- if (p != OSPF6_MESSAGE_END (oh))
- {
- if (IS_OSPF6_DEBUG_MESSAGE (oh->type, RECV))
- zlog_debug ("Trailing garbage ignored");
- }
+ assert (p == OSPF6_MESSAGE_END (oh));
}
static u_char *recvbuf = NULL;
@@ -1634,8 +1562,6 @@
OSPF6_MESSAGE_TYPE_NAME (oh->type), oi->interface->name);
zlog_debug (" src: %s", srcname);
zlog_debug (" dst: %s", dstname);
- if (len != ntohs (oh->length))
- zlog_debug ("Message length does not match actually received: %d", len);
switch (oh->type)
{
@@ -1655,8 +1581,7 @@
ospf6_lsack_print (oh);
break;
default:
- zlog_debug ("Unknown message");
- break;
+ assert (0);
}
}
@@ -1683,9 +1608,7 @@
break;
default:
- if (IS_OSPF6_DEBUG_MESSAGE (OSPF6_MESSAGE_TYPE_UNKNOWN, RECV))
- zlog_debug ("Unknown message");
- break;
+ assert (0);
}
return 0;