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92 lines
2.5 KiB
Plaintext
92 lines
2.5 KiB
Plaintext
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Starting with version 2.2, the resolver in the GNU C Library comes
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from BIND 8. Only a subset of the src/lib/resolv part of libbind is
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included here; basically the parts that are needed to provide the
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functionality present in the resolver from BIND 4.9.7 that was
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included in the previous release of the GNU C Library, augmented by
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the parts needed to provide thread-safety. This means that support
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for things as dynamic DNS updates and TSIG keys isn't included. If
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you need those facilities, please take a look at the full BIND
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distribution.
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Differences
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===========
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The resolver in the GNU C Library still differs from what's in BIND
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8.2.3-T5B:
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* The resolver in glibc strictly adheres to the recommendations in RFC
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1535. BIND 8.2.3-T5B seems to relax those rules a bit (see the code
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that's wrapped in `#ifndef RFC1535').
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* The RES_DEBUG option (`options debug' in /etc/resolv.conf) has been
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disabled.
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* The resolver in glibc allows underscores in domain names.
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* The <resolv.h> header in glibc includes <netinet/in.h> and
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<arpa/nameser.h> to make it self-contained.
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* The `res_close' function in glibc only tries to close open files
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referenced through `_res' if the RES_INIT bit is set in
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`_res.options'. This fixes a potential security bug with programs
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that bogusly call `res_close' without initializing the resolver
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state first. Note that the thread-safe `res_nclose' still doesn't
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check the RES_INIT bit. By the way, you're not really supposed to
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call `res_close/res_nclose' directly.
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Source code
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===========
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The following files come from the BIND distribution (currently version
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8.2.3-T5B):
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src/include/
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arpa/nameser.h
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arpa/nameser_compat.h
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resolv.h
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src/lib/resolv/
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herror.c
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res_comp.c
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res_data.c
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res_debug.c
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res_debug.h
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res_init.c
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res_mkquery.c
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res_query.c
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res_send.c
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src/lib/nameser/
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ns_name.c
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ns_netint.c
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ns_parse.c
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ns_print.c
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ns_samedomain.c
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ns_ttl.c
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src/lib/inet/
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inet_addr.c
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inet_net_ntop.c
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inet_net_pton.c
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inet_neta.c
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inet_ntop.c
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inet_pton.c
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nsap_addr.c
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src/lib/isc/
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base64.c
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Some of these files have been optimized a bit, and adaptations have
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been made to make them fit in with the rest of glibc. The more
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non-obvious changes are wrapped in something like `#ifdef _LIBC'.
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res_libc.c is home-brewn, although parts of it are taken from res_data.c.
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res_hconf.c and res_hconf.h were contributed by David Mosberger, and
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do not come from BIND.
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The files gethnamaddr.c, mapv4v6addr.h and mapv4v6hostent.h are
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leftovers from BIND 4.9.7.
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