Nmap Development: Version scanning problem with "--version-intensity 0"

[Makoto Shiotsuki <shio () st rim or jp>]

Version scanning against udp ports with "--version-intensity 0" option
causes nmap to crash.

The following is an example scanning result against normal W2K box.

-------------------------------------------------------
# nmap -n -sU -sV 192.168.183.12 --version-intensity 0

Starting Nmap 4.04BETA1 ( http://www.insecure.org/nmap/ ) at 2006-06-05 01:23 JST
nmap: service_scan.cc:1690: int send_probe_text (void *, void *, ServiceNFO *, 
ServiceProbe *): Assertion `probe' failed.
Aborted (core dumped)
-------------------------------------------------------

I think this seems to happen when the target port is not specified
by "ports" directive in the nmap-service-probes file at all.
(ie. no probes will be executed against that port)

In this case, "send_probe_text(nsp, nsi, svc, probe)" is called in
the function "servicescan_connect_handler()" with "probe" value NULL, 
so that, "assert(probe)" fails at line 1690 in service_scan.cc.

Makoto Shiotsuki


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