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Commit Graph

23 Commits (127ef8f903f2f0cf9101c7992d3aa7e3dcbb6bee)

Author SHA1 Message Date
Victor Julien 6ac30ae468 dns: suppress harmless cppcheck warning 
[src/app-layer-dns-common.c:273]: (warning) Assignment of function \
                        parameter has no effect outside the function.
 12 years ago
Victor Julien 7ea13f0f53 dns: fix passing NULL to memcpy 
app-layer-dns-common.c:401:5: warning: Null pointer passed as \
                              an argument to a 'nonnull' parameter
    memcpy(ptr, fqdn, fqdn_len);
 12 years ago
Victor Julien bee5ff172b dns: fix transaction handling 
When logging is disabled, the app layer would still be flagged
as logging. This caused transactions not to be freed until the
end of the flow as the logged tx id would never increment.

This fix postpones the setting of the app layer parser "logger"
flag to the point where we know the logger is enabled.
 12 years ago
Victor Julien 61cdd9be6b dns: detect case of request flooding 
In the case where DNS requests are sent over the same flow w/o a
reply being received, we now set an event in the flow and refuse
to add more transactions to the state. This protects the DNS
handling from getting overloaded slowing down everything.

A new option to configure this behaviour was added:

app-layer:
  protocols:
    dnsudp:
       enabled: yes
       detection-ports:
         udp:
           toserver: 53
       request-flood: 750

The request-flood parameter can be 0 (disabling this feature) or a
positive integer. It defaults to 500.

This means that if 500 unreplied requests are seen in a row an event
is set. Rule 2240007 was added to dns-events.rules to match on this.
 12 years ago
Victor Julien 07c97412f3 DNS: fix response name length logic 
In some cases where the length would be calculated as 0 we'd loop until
we'd hit our loop limit.

Update name logic everywhere.
 12 years ago
Eric Leblond 79fcf1378a Use unlikely in malloc failure test. 
This patch is a result of applying the following coccinelle
transformation to suricata sources:

  @istested@
  identifier x;
  statement S1;
  identifier func =~ "(SCMalloc|SCStrdup|SCCalloc|SCMallocAligned|SCRealloc)";
  @@

  x = func(...)
  ... when != x
  - if (x == NULL) S1
  + if (unlikely(x == NULL)) S1
 12 years ago
Victor Julien 5c08b2296f DNS: copy only the length of the hardcoded string, not the length of the destination buffer. 12 years ago
Anoop Saldanha f592c481dc Introduce a separate inspection engine for app events. 12 years ago
Anoop Saldanha 5e2d9dbdc3 Add and use EventGetInfo for getting info on an event. 
Also update existing parsers and app-layer-event Setup to use this.
 12 years ago
Anoop Saldanha 6cb0014287 Move app event module registration as a part of app layer proto table. 12 years ago
Victor Julien 3d78cc8ca6 DNS: free TX events using proper function 12 years ago
Victor Julien 6aed56d093 Dns: fix memory leak when events are set 12 years ago
Victor Julien 91fb47475b DNS: break out of DNSResponseGetNameByOffset if we're in there too long. Can happen on bad data. 12 years ago
Victor Julien 2f3f577fb6 DNS: convert info logs to debugs 12 years ago
Victor Julien 1c371da46d DNS: better handle TX' with lost replies 12 years ago
Victor Julien 1367074c75 App layer: clean up TX before lowest active one 
Update DNS to handle cleaning up this way.
 12 years ago
Victor Julien ebab9aee83 DNS: move internal tx id tracking to u64 12 years ago
Victor Julien e8ad876b48 App layer: add 'StateHasEvents' API call 
Per TX decoder events resulted in significant overhead to the
detection engine, as it walked all TX' all the time to check
if decoder events were available.

This commit introduces a new API call StateHasEvents, which speeds
up this process, at the expense of keeping a counter in the state.

Implement this for DNS as well.
 12 years ago
Victor Julien 571b8ac186 DNS: add support for per TX decoder events. 12 years ago
Victor Julien 43ba5a677e DNS: enable mpm/fast_pattern support for dns_query 12 years ago
Victor Julien f10dd603ff DNS: adding dns_request content modifier 12 years ago
Victor Julien 6674f4892c DNS: add per tx internal id 
Add per TX id. Rename transaction_cnt to transaction_max (id) and increment it on tx creation.
 12 years ago
Victor Julien 8e01cba85d DNS TCP and UDP parser and DNS response logger 12 years ago