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doc4.awk
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1996-10-25
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57 lines
#
# doc4.awk
#
# Distributed with: Doc - Version 2.0 (8/22/90)
# USC Information Sciences Institute
#
#
# Accepts as input, output from dig querying for NS records of a
# domain. Expects input to include TTLs and to be all lower case.
# Also expect to get address of these nameservers in the Additional
# section.
#
# Ouput a list of internet dot-notion addresses of nameservers
# for domain. Only does so if domain name of server is in domain.
# i.e. vax.darpa.mil. is a nameserver for isi.edu., but we are
# not interested in addresses not on isi networks
#
# Currently, if more than one address (of some server) are on the
# same network (subnets not recognized), only one is printed.
# Arguably for completeness, all address should be printed.
#
# Intended use: targets for queries to check for presence of
# in-addr.arpa mappings for domain.
#
BEGIN {n=0}
## Find domain being tested (will be NS record for it)
$4 == "ns" {
ns = $1;
}
##
## Look at A records, presumably Additional answers
## for addresses of nameservers.
##
$4 == "a" && ns != "" {
if (index($1,ns) > 0) { ## is server name in domain ?
split($5, dd, ".");
if (dd[1] < 127) {
ii = dd[1];
} else if (dd[1] < 192) {
ii = dd[1] dd[2];
} else {
ii = dd[1] dd[2] dd[3];
}
# print "DDT", ii, hnet[ii], $5
if (hnet[ii] == "") {
hnet[ii] = $5;
# print "DDT:" , $0
print $5;
}
}
}