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Diffstat (limited to 'usr.sbin/named/host/RELEASE_NOTES')
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diff --git a/usr.sbin/named/host/RELEASE_NOTES b/usr.sbin/named/host/RELEASE_NOTES new file mode 100644 index 00000000000..095114f10ea --- /dev/null +++ b/usr.sbin/named/host/RELEASE_NOTES @@ -0,0 +1,770 @@ + @(#)RELEASE_NOTES e07@nikhef.nl (Eric Wassenaar) 951231 + +yymmdd Description of changes per release +TODO Things that still need to be done +WISHLIST Wishes expressed by various people +NOTES Important issues to keep in mind +MISC Miscellaneous reminders + +# ---------------------------------------------------------------------- +# Description of changes per release +# ---------------------------------------------------------------------- + +951231 + Cosmetic changes. + Print all relevant messages in debug mode to stdout, + and appropriately prefix them with ";; " to conform + with the BIND 4.9.3 conventions. + Miscellaneous changes. + Consider the all-ones broadcast address a fake address. + +951024 + Avoid potential alignment conflicts. + Allocate socket addresses of type struct sockaddr_in + instead of type struct sockaddr. The first one has + stricter alignment restrictions, although they have + the same size. + Correct various misspellings. + Noted by Keith Bostic <bostic@bsdi.com> + +950925 + Portability fix. + Refine type definitions for the arguments to various + resolver routines to be even more backward compatible, + and to avoid compilation or lint warning messages on + new platforms. It should run clean on BSD44 systems. + There are no functional changes in this release. + +950923 + Add new -z option to list delegated zones in a zone. + This is a new variant of the zone listing specials. + A zone transfer is done, and only the names of the + encountered delegated zones are printed. + This option is undocumented, and subject to change. + Sort list of delegated zones alphabetically. + Before acting on delegated zones during zone listings, + sort them in alphabetical order for prettier output. + Portability fix. + The BIND 4.9.3 resolver routines require the passed + buffer arguments to be of type u_char instead of char. + This causes a prototype mismatch for HOST_RES_SEND. + Mentioned by Geert Jan de Groot <geertj@ripe.net> + Minor command option functionality change. + The -L flag, when given without any other list mode + option, now implies the -l option. + Miscellaneous code cleanup. + Pass the name of the actually contacted server during + zone listings in more elegant way. + Avoid (harmless) lint warnings on picky platforms. + +950822 + Fix bug in recursive lookup handling. + During recursive lookups, e.g. when following CNAME + chains, querynames are always assumed to be already + fully qualified, and must be tried ``as is''. + The classical example of a CNAME that points to the + pseudo "localhost.", or an erroneously dot-terminated + single name, should not be subject to local aliasing + or search list processing. They were. + Reported by Alexander Dupuy <dupuy@smarts.com> + +950809 + Portability fix. + Check for SVR4 as well as for SYSV in port.h, which is + necessary for compilation via the master BIND Makefile. + Suggested by <Piete.Brooks@cl.cam.ac.uk> + There are no functional changes in this release. + +950502 + Maintain hash list for zone name lookups. + This should not be really necessary for most practical + purposes, but it makes processing of the .in-addr.arpa + zone and even the .COM zone at least feasible. + The latter still requires quite a lot of memory, and + some cpu time to filter out the glue records from its + 50000 A records and 110000 NS records. + The toplevel zone count as of today is: + COM 50000 delegated zones + IN-ADDR.ARPA 30000 delegated zones + ORG 5000 delegated zones + NET 3000 delegated zones + EDU 2000 delegated zones + Suppress various checks in quiet mode. + This avoids costly checks and achieves some speedup + in cases that nothing would have been printed anyway. + Supply alternative recv_sock() module. + The select() system call may fail on the solaris 2.4 + platform without appropriate patches. An alarm can be + used instead, at the cost of extra system call overhead. + +950429 + Fix bug in error reporting. + The name and address of the contacted server during + zone listings could be clobbered by intermediate + calls to res_send(). + +950427 + Fix glitch in host name lookup. + New entry would be inadvertently added to the hash + lish in case the MAXHOSTS limit was reached. + Miscellaneous changes. + Speedup comparison of zone names and host names by + looking up zone names in the host name hash list. + +950407 + Maintain hash list for host name lookups. + A linear search through the per-zone host name table + becomes very costly for zones with several thousands + of hosts. Significant speedup is achieved. + Even for recursive listings of many small zones the + reduction of total processing time is noticeable. + +950318 + Increase (static) maximum number of hosts. + This avoids imposing arbitrary limits in most cases. + +950302 + Prevent zone transfer for certain zones. + Some zones are known to contain bogus information. + E.g. definition of A records for all possible addresses + in a class-B network will bias the hostcount. + Add new -N option to define an explicit list of zones + for which a zone transfer is deliberately skipped. + Requested by Peter Koch <pk@TechFak.Uni-Bielefeld.DE> + Miscellaneous code cleanup. + Split off various tasks from monolithic list_zone(). + Invert the double matching loop in sort_servers(). + Fix glitch when comparing matching domain labels. + +950115 + Sort list of nameservers for a zone. + When the NS records for a zone are issued in BIND 4.9 + round-robin fashion, this may yield an unfavorable + order for doing zone transfers. Apply some heuristic + to sort them according to preference, giving priority + to servers within your own domain or parent domains. + Add new option -P to define an explicit list of domains + of preferred servers, giving priority to matching ones. + Suggested by Marten Terpstra <marten@ripe.net> + Don't suppress certain rr data any more. + The preference value in the MX/RT/PX records and the + version number in the AFSDB record was suppressed in + non-verbose mode, unless the -T option was specified. + These values are now printed by default. + Requested by Geert Jan de Groot <geertj@ripe.net> + +941210 + Adapt implementation of LOC RR. + The binary data format has already changed twice: + the four 4-bit fields are now four 8-bit fields, + and log2 encoding has changed to power-of-10 encoding. + Support for this will be incorporated in BIND 4.9.3. + Still undocumented in the host manual page. + +941206 + Compatibility with BIND 4.9.3. + The NOCHANGE query response has now been conditionally + defined via #ifdef ALLOW_UPDATES. Older versions of + BIND may still return this (should have been FORMERR). + Improve error reporting. + Define a special h_errno status SERVER_FAILURE for the + case a SERVFAIL query response is returned. This is + used to report lame delegations during SOA checking + or zone transfers. Servers may return this code when + the zone data has expired altogether. This is not a + TRY_AGAIN situation if such server is authoritative. + Suggested by Peter Koch <pk@TechFak.Uni-Bielefeld.DE> + Rename special status NOT_AVAILABLE to QUERY_REFUSED. + Various minor changes. + Check for invalid characters in T_AAAA record names. + Print optional protocol and port from T_A record + after a comment sign. Not sure whether this has ever + been used. + +941129 + Implement LOC RR as defined by preliminary draft-RFC. + Requires conversion routines for spherical position, + vertical position, and precision. + Tested on big-endian, little-endian, Alpha, Cray. + This is only a pre-release. + Undocumented until RFC gets public. + +941125 + Recognize new RR types as reserved by RFC 1700. + Implement PX RR type as defined per RFC 1664. + Implement GPOS RR type as defined per RFC 1712. + Include few simple utility scripts. + These are just examples of wrappers to host. + nslookup -- emulate most functions of the real one. + mxlookup -- lookup records at each of its servers. + +941006 + Lessen restrictions for certain tests. + The checks for invalid underscores and canonical host + names were suppressed during recursive zone listings + on all levels. They are now suppressed only when not + operating on the base level. This enables the checks + during the ``host -C -L 1'' command. + Extend functionality of -A option. + If the -A flag is specified along with any explicit + list mode option, it enables reversed address checking. + The address of each encountered A record is reverse + mapped, and it is checked whether it is registered and + maps back to the A record name. This flag can safely + be specified in the ``host -CA -L 1'' command. + Add new -W option to list wildcard records in a zone. + This is a new variant of the zone listing specials. + A zone transfer is done, and only wildcard records + are printed. The default resource record type is MX. + This option is undocumented, and subject to change. + +941004 + Improve printout. + Include conversion of the various time values from the + SOA record in the comment part during ordinary printout. + +941002 + Call alternative res_debug print routine if available. + In BIND 4.9.* an alternative module is present which + accepts (as it should) the size of the query buffer. + Rearrange include files. + Move configuration definitions to new conf.h. + +940917 + Improve support for NSAP records, as per RFC 1637. + Print ordinary NSAP addresses with separating dots, + after the 1-byte AFI, then after every 2 bytes. + Add new option -n to generate reverse NSAP within the + nsap.int domain, similar to the -i option. + Print reverse NSAP in forward notation, unless forced + to print full zone file format. + +940911 + Verify that some host names are canonical. + This is formally required, but also in practice highly + desirable. The target hosts in NS and MX records only + are verified, being the most crucial. + Currently the test is skipped during recursive zone + processing, to avoid excessive output of non-canonical + MX targets. + When figuring out the nameservers for a zone before + doing a zone transfer, a non-canonical nameserver name + is always reported. + Report illegal domain names. + This is now done by default for 'host' related domain + names. The A and MX record names and NS and MX target + names are checked only. + Only alphanumeric characters and hyphen '-' are valid. + Currently the reporting of names containing underscores + is suppressed during recursive zone listings, to avoid + excessive output of such illegal host names. + During SOA checking, an illegal primary or hostmaster + is always reported. + Document the -I option. + This option does no longer trigger the checking of + invalid characters in names. + To suppress illegal underscore messages, use "-I _". + To show them during recursive listings, use "-I ''". + Modify various messages. + Make some warning messages slightly shorter, and start + the message with the resource record or zone name. + Most of the SOA check messages have been affected. + Remove the answer buf offset in the incomplete HINFO + warning messages. + Improve error reporting. + Include the name of an explicit server in ns_error() + messages describing h_errno. This was already done + for the errno messages. + Include the server name also in ns_error() messages + after a failing zone transfer from that server. + Define a special h_errno status NOT_AVAILABLE for the + case a query was explicitly refused. Some servers are + configured to refuse zone transfers. + Major update of manual page. + Explain some more failure messages. + Explain most of the common warning and error messages. + +940819 + Modify various messages. + Include the server name in messages reporting failures + and problems during zone transfers. + Implement ttl consistency checks. + Multiple records of same name/type/class should have the + same ttl value in zone listings. This is now checked. + A suitable hash function is needed to minimize overhead. + The approach is similar to the function used in sendmail. + This has been a long standing wish from + Peter Koch <pk@TechFak.Uni-Bielefeld.DE> + Various speedup fixes. + Avoid unnecessary indomain() calls during zone listings. + +940713 + Modify various messages. + Replace some of the ``extraneous'' messages with a more + descriptive text. Include name and type of the query in + messages reporting format errors in the response. + Include zone name in error messages during SOA check. + Revise check for valid names. + If a domain name refers to a ``mailbox'', the part up to + the first unquoted dot is the ``local part'' to which + the RFC 822 syntax rules apply. + +940623 + Revise res_send() strategy. + Mark bad server status for certain conditions which make + it unlikely that we will succeed during the next try. + Operating system failures are not in this category. + Nameserver unreachable status is now reported in a more + reliable fashion. A second try would sometimes timeout. + (May be useful for monitoring the upcoming summer 1994 + reshuffling of EBONE/EuropaNET/NSFnet interconnections). + Facelift for socket I/O routines. + Systematically use _res_close() to close a connection. + Include the answer packet length in debug printout. + Extend resolver initialization. + Set initial query ID to some arbitrary number. + Various speedup fixes. + Avoid unnecessary strlen() calls during zone listings. + Check whether the resource record data must be printed + outside the print routine to avoid unnecessary overhead. + Use bcopy() instead of sprintf() in obvious cases. + Better output format control. + In non-verbose and non-debug mode, only pure resource + record output is written to stdout. + Add new -Z option to force resource record output to be + in full zone listing format, including trailing dot in + domain names, plus ttl value and class indicator. + Rearrange include files. + Define resource record structures in rrec.h. + Function declarations moved to defs.h. + +940615 + Various portability changes. + Avoid use of sizeof() for all entities that have a fixed + field width, and use predefined constants instead. This + is necessary for systems without 16 or 32 bit integers. + Fix use of ipaddr_t and struct in_addr appropriately. + All this makes the utility portable to e.g. Cray. + Save and restore state during recursive lookup. + Error codes could be clobbered during MAILB tracing. + Miscellaneous minor code cleanup. + +940603 + Fix implementation for -F option properly. + Exchanging the role of stdout and the logfile now works + on all platforms. Asked by Artur Romao <artur@dns.pt> + +940526 + Combine explicit server and -p option. + If both are specified, the explicit server is contacted + to retrieve the desired servers for the given zone + during zone listing/checking modes. This is useful for + checking zones that have not been registered yet. + Requested by Geert Jan de Groot <geertj@ripe.net> + Rudimentary support for NSAP records. + This is still very experimental. It is unclear how an + NSAP address should be encoded in the resource record, + and how its hierarchical structure is decided. + Inspired by the 4.9 diffs from cisco.com. + +940317 + Print SOA serial always as an unsigned value. + Warn about ``extraordinary'' serial if high bit is set. + Reset errno to avoid stale values. + Could happen when doing multiple gethostbyaddr() calls + in extended mode when the BIND res_send() is linked in. + Problem noted by <Piete.Brooks@cl.cam.ac.uk> + Solaris portability fix. + For solaris 2.x use res_gethostby{addr,name} modules + to force dns lookups. The __switch_gethostby{addr,name} + modules have disappeared in solaris 2.3. + +930926 + Extend -I option with argument containing allowed chars. + This string specifies formally illegal, but silently + allowed characters when checking illegal domain names. + The -I option is still necessary to enable checking. + Still done only for resource record names in listings. + Note that some hesiod names contain the '/' character. + Indicated by Peter Koch <pk@TechFak.Uni-Bielefeld.DE>. + Additional SOA record checks. + Check hostmaster field for illegal chars, such as '@' + (needed as long as data field names are not checked). + Revised SOA record checks. + Check primary field against list of known nameservers. + Issue warning if not among the authoritative servers. + This may be intentional in special cases, however. + Required some code reshuffling. + Add new -M option to list mailable subdomains in a zone. + This is a new variant of the zone listing specials. + A zone transfer is done (without listing anything by + default) to determine the available delegated zones. + For each of these zones, the MX records are printed. + Experimental, undocumented. Insufficient too: you + really want to see also the domains for which only + an MX record exist. + Cleanup terminology in the code documentation. + Remove the word 'subdomain' and cleanup the confusion + between 'domain' versus 'zone'. + Update manual page. + Use terminology that is technically more correct. + Explain various things that were still missing. + +930919 + Print actual name that was queried in error messages. + Formerly, only the (possibly abbreviated) queryname + as specified on the command line was printed. + Special care must be given if domain search is enabled, + especially in the enforced BIND compatibility mode. + Looks much better. Asked by <Piete.Brooks@cl.cam.ac.uk> + Some more SOA record tests. + Some records have the name of the zone specified in the + field that should contain the name of the primary server. + Miscellaneous minor changes. + Slightly modify the nameserver name printout during -C. + Set proper h_errno when answer buffer counts are corrupt. + Add new -V option to print version number. + Define version in separate vers.c + Use class mnemonics as defined in RFC 1035. + Print 'CH' instead of 'CHAOS'. Anyone using this ? + Recognize obsolete 'CS' or 'CSNET'. Pretty useless. + Just for ultimate completeness. + Check for invalid characters in domain names. + Only alphanumeric characters and hyphen '-' are valid. + Unfortunately, the use of underscore '_' is widespread, + so issuing a warning by default is unrealistic. Therefore: + Add new -I option to warn about illegal domain names. + Currently done only for resource record names during zone + listing. Could be extended to domain names in data fields. + Perhaps a warning by default in case illegal other than + underscore. Option is still undocumented as the semantics + are subject to change. + +930915 + Add -R option to always first try search domains. + Normally querynames are assumed to be fully qualified + and are tried as such, unless it is a single name which + is always tried, and only once, in the default domain. + This option sets RES_DNSRCH and simulates the default + BIND behavior, with the exception that NO_DATA status + terminates the search immediately. + With the additional otherwise undocumented -B option the + BIND behavior is fully enforced and the search continues. + Added only for testing purposes, not for general use. + Few more BIND 4.9 compatibility changes. + Some resolver routines have gotten new argument types. + Adapt Makefile to BIND conventions. + The Makefile can be used completely stand-alone, + or can be invoked from the master BIND Makefile. + Affects names of various (inherited) make variables. + Change BIND_RES_SEND to HOST_RES_SEND with opposite + meaning. Default is HOST_RES_SEND in case stand-alone. + +930911 + Extension of user interface. + Allow multiple arguments on command line or from stdin. + Requires new syntax for specifying explicit server. + New options -x and '-X server' indicate extended syntax. + Quite a lot reshuffling of code. Urgently requested by + <Piete.Brooks@cl.cam.ac.uk> and Paul Vixie <paul@vix.com> + Configurable default options. + Use an environment variable HOST_DEFAULTS to pre-define + default options and parameters. These are interpolated + in front of the command line arguments before scanning. + Syntax is the same as the command line syntax. + Fix bug when querying single name without dot. + Not only the default domain, but also the eventual other + search domains would be tried, although DNSRCH is off. + This is a long-standing bug. Very important fix. + +930908 + Various declaration changes for portability. + Print TXT/HINFO/UINFO strings within double quotes. + It is done both in regular and zone listing output. + This is conforming the syntax for zone input files. + Add trailing dot to domain names in zone listing. + This is conforming the syntax for zone input files. + The trailing dot is not added in regular output. + Define exit codes in new exit.h header file. + This avoids the need to include /usr/ucbinclude when + running in non-BSD mode on solaris 2.x platforms. + Attempt to diagnose lame delegations. + Error messages about lame delegations are given during + zone listings and when checking SOA records (but only when + the contacted servers are supposed to be authoritative). + Also in case servers from NS records turn out not to exist. + This may need some refinement for special cases. + Perform some extra checks during zone listings. + Check for unexpected error status in packets. Only the + very first packet in response to a transfer query can + have an error status. + Issue warning if only a single nameserver found. + Not an error per se, but not much redundancy then. + Suggested by Peter Koch <pk@TechFak.Uni-Bielefeld.DE>. + Check for anomalous empty zone transfers. + Transfers consisting of only SOA records could occur if + we queried the victim of a lame delegation which happened + to have the SOA record present. Fake an error that will + result in a lame delegation message. + Mentioned by Peter Koch <pk@TechFak.Uni-Bielefeld.DE>. + Indicate list/check failure/success via exit code. + Failure status is returned in case any error has been + reported via errmsg or pr_error (not pr_warning). + For Ruediger Volk <rv@deins.informatik.uni-dortmund.de> + Add -o option to suppress rr output to stdout. + Can be used in combination with -f to separate rr output + from verbose comments and error output. + Perform some SOA timer consistency checks. + Check timer values for anomalies, such as (retry > refresh) + or (refresh + retry > expire). + Suggested by Peter Koch <pk@TechFak.Uni-Bielefeld.DE>. + Also compare all values instead of just serial. + More accurate reporting of zones processed. + Print total number of successful zone transfers versus the + number of attempted transfers. Print count of zones which + were successfully processed (transferred or -C checked) + versus the number of zones requested to be processed. + From this we can deduce the number of transfers that failed + and the number of times we couldn't find any nameservers. + +930901 + Increase MAXNSNAME from 12 to 16. + This is conforming NSMAX in ns.h + Don't accumulate statistics if not necessary. + Skip the costly host count scan in case nothing would + be reported at all according to the command line options. + Add some extra checks during zone listings. + Check for invalid nonzero nscount and arcount. + Special handling for non-authoritative answers. + We had already NO_RREC for non-authoritative NO_DATA, but + non-authoritative HOST_NOT_FOUND would yield TRY_AGAIN. + Change this to NO_HOST to issue a separate error message. + This identifies some special cases, e.g. queries for a + non-existing name using class C_ANY when the nameserver + is authoritative only for one specific class. + Use TRY_AGAIN in both cases during zone listing errors. + Minor declaration changes for portability. + Add -F option to exchange role of stdout and logfile. + The '-F file' is the same as '-f file' but all stdout + output goes to the logfile, and stdout only gets the extra + resource record output (so that it can be used in pipes). + Implementation is inherently unportable. Supported only on + a few platforms where it happens to work. + Explain status messages in the manual page. + Include address and name of server in perror messages. + This gives a lot more information in case stderr and stdout + are differently redirected. + +930830 + Make error checking in some routines uniform. + Miscellaneous declaration changes. + Filter resource record class appropriately. + In zone listings records of different class can show up, + e.g. HS records are mixed with IN records. Only records + of the requested class should be processed. This fixes + problems with recursive zone traversals and inaccurate + statistics. Pointed out by <Yves.Devillers@inria.fr> + and <Piet.Beertema@EU.net>. Important fix. + Include record class, if special, in some output. + Show the class if it is not the default IN class. + Include address of duplicate hosts in message. + This may help to locate the problem. + Properly concatenate long TXT strings that are split. + Long TXT strings (>255) are split as of BIND 4.8.3. + They were displayed incorrectly with TAB separators. + Problem noted by Peter Koch <pk@TechFak.Uni-Bielefeld.DE>. + Cleanup some DNS terminology in output messages. + Fix some confusion between '(sub)domain' and 'zone'. Only + done in the output of host, not yet in the documentation. + Pointed out by Peter Koch <pk@TechFak.Uni-Bielefeld.DE>. + Implement host address list as hashed list. + The linear list is replaced with a hashed list, using the + low-order address bits as the key. This may dramatically + speed up recursive zone listings. Very important fix. + Suggested by Peter Koch <pk@TechFak.Uni-Bielefeld.DE>. + Miscellaneous portability hooks. + Add new port.h header file. + Change u_long to u_int for resource record fields. + These are fixed 32-bit quantities. + Note that BIND 4.9 uses u_int32_t for these, but still uses + (inconsistently) u_short instead of u_int16_t. + Necessary for port to alpha and BIND 4.9. + Change u_long to ipaddr_t for 32-bit address fields. + For the time being, make this identical to u_long for non- + alpha machines with pre-BIND 4.9 to avoid lint warnings. + Note that BIND 4.9 uses u_int32_t for these. + Necessary for port to alpha and BIND 4.9. + Introduce new typedef for 'struct state'. + Necessary for BIND 4.9. + Make all arguments to vararg routines same type. + No more mixing of arbitrary pointers and ints. Only number + of arguments is variable. Requires few silly interfaces. + Necessary for port to alpha. + Add the RELEASE_NOTES file to explain changes. + +930209 + Lookup server name with default resolver values. + Check SOA records without nameserver recursion. + Implement new RR types from RFC 1183 and 1348. + +921005 + Anticipate ultrix specific resolv.h + Miscellaneous declaration changes. + Some reshuffling of code. + +920702 + Recognize alternative program call names. + Distinguish between auth and non-auth NO_DATA. + +920624 + Lookup server name before changing nameserver address. + Handle possible truncation in zone transfers. + Provide private simplified version of res_send(). + Add -u option to force virtual circuit connections. + Move all socket I/O routines to separate send.c. + +920616 + Allocate list of zonenames dynamically, not statically. + Move and slightly modify the test for fake hosts. + Suppress host count statistics during inverse listing. + Miscellaneous documentation updates. + +920315 + Improve counting of hosts within domain. + Discard glue records not directly within domain. + Keep track of hosts with duplicate address. + Add -D option to list duplicate hosts. + Add -E option to list extrazone hosts. + Miscellaneous casting and typing cleanup. + Increase (static) number of possible subdomains. + +911201 + Option -T also prints MX preference value. + Save name of longest hostname found (just for fun). + Undocumented option -g to select long names (fun). + +911010 + Don't recurse on cnames if querytype is cname. + +910923 + Count gateway hosts (with multiple addresses). + Add -G option to list gateway hosts. + +910905 + Improve counting of hosts within domain. + Allow hosts not directly within domain. + Increase (static) maximum number of hosts. + +910415 + Improve finding of subdomain names. + Allow subdomains not directly within domain. + Check for unauthoritative glue records. + Add -T option to print ttl when non-verbose. + Improve connect timeout handling. + Improve dotted quad parsing. + Minimum ttl is now called default ttl. + +910129 + Maintain count of hosts during domain listings. + Check for hosts with same name as subdomain. + Add -H option for special host count mode. + Recognize obsolete T_MAILA. + +# ---------------------------------------------------------------------- +# TODO +# ---------------------------------------------------------------------- + + Documentation changes. + References to BIND 4.9, not only 4.8. + + Enhance reverse mapping. + The new BIND 4.9.* gethostbyaddr() can be configured + to return host aliases in case multiple PTR records + were encountered during the reverse lookup. + It is unclear what the official host name should be. + Should perhaps abandon the idea of official host name. + +# ---------------------------------------------------------------------- +# WISHLIST +# ---------------------------------------------------------------------- + + Skip printing of second SOA in zone listing. + Asked by Peter Koch <pk@TechFak.Uni-Bielefeld.DE>. + +# ---------------------------------------------------------------------- +# NOTES +# ---------------------------------------------------------------------- + + Include files and resolver library. + If you are linking this utility with an explicit resolver + library, make sure you will be compiling with the same + include files that were used to build the resolver library. + The BIND 4.9 include file <resolv.h> is incompatible with + the BIND 4.8 version. This utility can handle both versions, + but you cannot link with an 4.9 library after compilation + with the 4.8 include files, and vice versa. + + Old resolver libraries. + The res_mkquery() routine in the SUN-supplied resolver + library on SunOS <= 4.1.3 adds the default domain to given + single names if REF_DEFNAMES is set. This is not correct and + leads to undesired results if you query about toplevel domains. + It may be a pre-BIND 4.8.2 problem. + The same behavior is reported in the default ultrix resolver. + This will not be fixed in host. The documentation states that + you need BIND 4.8.2 or higher. + Problem noted by Peter Koch <pk@TechFak.Uni-Bielefeld.DE>. + + Vendor-specific resolver libraries. + Some vendors supply resolver libraries with configurable + lookup strategies for gethostbyname/gethostbyaddr, e.g. to + consult DNS, NIS, /etc/hosts, or other databases, in specific + order. Such libraries are to be avoided when linking host. + It is meant to query the DNS and DNS only. + + SUN's resolver library on solaris 2.x + If you are on solaris 2.x and you don't have a proper BIND + resolver library to link with, but have to use the broken + default library, you can define NO_YP_LOOKUP in the Makefile + to prevent gethostbyname/gethostbyaddr querying the YP/NIS. + SUN will probably implement BIND 4.9.3 after its release. + +# ---------------------------------------------------------------------- +# MISC +# ---------------------------------------------------------------------- + + Port to DEC/Alpha with OSF/1. + Requested by various people. + This requires basically two adaptations: + - sizeof(u_long) is 64 bits instead of 32 bits. + Affects ip address fields and some fixed fields in the + nameserver query/answer buffers. + - pointers in C subroutine arguments are 64 bit quantities. + Affects the varargs modules. + Suggestions by Dietrich Wiegandt <dietrich@dxcern.cern.ch> + and David Cherkus <cherkus@zk3.dec.com>. + + Compatibility with BIND 4.9. + Don't use the u_long types any more. + The 'struct state' is now 'struct __res_state'. + New resolver library has various hooks for 'dig'. + New resolver library prints to stdout with leading ";" but + unfortunately not everywhere. It prints to stderr sometimes + also with ";" but does not so in the perror() messages. + (Things have been corrected in BIND 4.9.3). + BIND 4.9 prints FQDN with trailing dot. + BIND 4.9 prints TXT strings within double quotes. + + New features of BIND 4.9.3. + Don't use sizeof() for u_int, u_short, struct in_addr, and + HEADER, but use predefined constants for entities that have + a fixed field width. + A new parameter _res.ndots has been defined. + The res_search() module may query the given name ``as_is''. + The res_search() module retries after SERVFAIL. + The res_send() module marks a bad server status for almost + every error condition. + Extra checks are carried out to ensure that a reply packet + really is the answer to a query: nameserver addresses and + query fields are compared. + |