net-ns-dns-testing.html
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>DNS Client Testing</A
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><P
>The DNS client has a test program, dns1.c, which tests many of
the features of the DNS client and the functions
<CODE
CLASS="FUNCTION"
>gethostbyname(),</CODE
>
<CODE
CLASS="FUNCTION"
>gethostbyaddr()</CODE
>,
<CODE
CLASS="FUNCTION"
>getaddrinfo()</CODE
>,
<CODE
CLASS="FUNCTION"
>getnameinfo()</CODE
>.
</P
><P
>In order for this test to work, a DNS server must be configured
with a number of names and addresses. The following is an example
forward address resolution database for bind v9, which explains the
requirements.</P
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CLASS="PROGRAMLISTING"
> $TTL 680400
@ IN SOA lunn.org. andrew.lunn.lunn.org (
2003041801 ; serial
10800 ; refresh
1800 ; retry
3600000 ; expire
259200) ; mimimum
IN NS londo.lunn.org.
hostnamev4 IN A 192.168.88.1
cnamev4 IN CNAME hostnamev4
hostnamev6 IN AAAA fec0::88:4:3:2:1
cnamev6 IN CNAME hostnamev6
hostnamev46 IN A 192.168.88.2
hostnamev46 IN AAAA fec0::88:4:3:2:2
cnamev46 IN CNAME hostnamev46
</PRE
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>The actual names and addresses do not matter, since they are
configurable in the test. What is important is the relationship
between the names and the addresses and there family. ie
hostnamev4 should map to one IPv4 address. hostnamev46 should
map to both an IPv4 and an IPv6 address. cnamev4 should be a
CNAME record for hostname4. Reverse lookup information is also
needed by the test.
</P
><P
>The information placed into the DNS server is also need in the
test case. A structure is defined to hold this
information:</P
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> struct test_info_s {
char * dns_server_v4;
char * dns_server_v6;
char * domain_name;
char * hostname_v4;
char * cname_v4;
char * ip_addr_v4;
char * hostname_v6;
char * cname_v6;
char * ip_addr_v6;
char * hostname_v46;
char * cname_v46;
char * ip_addr_v46_v4;
char * ip_addr_v46_v6;
};
</PRE
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>The test program may hold a number of such structures for
different DNS server. The test will use each structure in turn
to perform the tests. If IPv6 is not enabled in the eCos
configuration, the entries which use IPv6 may be assigned to
NULL.
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