From 407c39643100147939cfee8039e56617b81b1ef3 Mon Sep 17 00:00:00 2001 From: David van Moolenbroek Date: Tue, 14 Feb 2017 17:34:20 +0000 Subject: [PATCH] Retire MINIX nonamed(8) Also retire support for the MINIX versions of /etc/hosts and /etc/resolv.conf. These files will be brought back with NetBSD imports, although like NetBSD, MINIX 3 will be using external resolvers directly from then on. Since resolv.conf is hand-created rather than installed, we do not mark it as obsolete. Change-Id: Ie6154d5a4d8d977c19b9754bf920ae868680e9d1 --- distrib/sets/lists/minix-base/mi | 3 +- distrib/sets/lists/minix-debug/mi | 2 +- distrib/sets/lists/minix-man/mi | 8 +- etc/Makefile | 1 - etc/resolv.conf | 2 - minix/commands/Makefile | 1 - minix/commands/nonamed/Makefile | 4 - minix/commands/nonamed/nonamed.8 | 309 ---- minix/commands/nonamed/nonamed.c | 2227 ----------------------------- minix/man/man5/Makefile | 4 +- minix/man/man5/hosts.5 | 57 - minix/man/man5/resolv.conf.5 | 48 - minix/man/man5/resolver.5 | 98 -- minix/man/man7/hier.7 | 2 - 14 files changed, 8 insertions(+), 2758 deletions(-) delete mode 100644 etc/resolv.conf delete mode 100644 minix/commands/nonamed/Makefile delete mode 100644 minix/commands/nonamed/nonamed.8 delete mode 100644 minix/commands/nonamed/nonamed.c delete mode 100644 minix/man/man5/hosts.5 delete mode 100644 minix/man/man5/resolv.conf.5 delete mode 100644 minix/man/man5/resolver.5 diff --git a/distrib/sets/lists/minix-base/mi b/distrib/sets/lists/minix-base/mi index 67c8d0c43..7d53b7ced 100644 --- a/distrib/sets/lists/minix-base/mi +++ b/distrib/sets/lists/minix-base/mi @@ -153,7 +153,6 @@ ./etc/rc.shutdown minix-base ./etc/rc.subr minix-base ./etc/release minix-base -./etc/resolv.conf minix-base ./etc/rs.inet minix-base obsolete ./etc/rs.single minix-base ./etc/saslc.d minix-base crypto @@ -455,7 +454,7 @@ ./usr/bin/nice minix-base ./usr/bin/nl minix-base ./usr/bin/nohup minix-base -./usr/bin/nonamed minix-base +./usr/bin/nonamed minix-base obsolete ./usr/bin/nroff minix-base ./usr/bin/od minix-base ./usr/bin/openssl minix-base crypto diff --git a/distrib/sets/lists/minix-debug/mi b/distrib/sets/lists/minix-debug/mi index d6eed1c28..45091f0b3 100644 --- a/distrib/sets/lists/minix-debug/mi +++ b/distrib/sets/lists/minix-debug/mi @@ -362,7 +362,7 @@ ./usr/libdata/debug/usr/bin/nl.debug minix-debug debug ./usr/libdata/debug/usr/bin/nm.debug minix-debug debug ./usr/libdata/debug/usr/bin/nohup.debug minix-debug debug -./usr/libdata/debug/usr/bin/nonamed.debug minix-debug debug +./usr/libdata/debug/usr/bin/nonamed.debug minix-debug debug,obsolete ./usr/libdata/debug/usr/bin/objcopy.debug minix-debug debug ./usr/libdata/debug/usr/bin/objdump.debug minix-debug debug ./usr/libdata/debug/usr/bin/openssl.debug minix-debug debug diff --git a/distrib/sets/lists/minix-man/mi b/distrib/sets/lists/minix-man/mi index 78ef9f05d..09b09732f 100644 --- a/distrib/sets/lists/minix-man/mi +++ b/distrib/sets/lists/minix-man/mi @@ -3284,7 +3284,7 @@ ./usr/man/man5/ftpusers.5 minix-man ./usr/man/man5/gettytab.5 minix-man ./usr/man/man5/group.5 minix-man -./usr/man/man5/hosts.5 minix-man +./usr/man/man5/hosts.5 minix-man obsolete ./usr/man/man5/http_status.5 minix-man obsolete ./usr/man/man5/httpd.conf.5 minix-man obsolete ./usr/man/man5/info.5 minix-man @@ -3303,8 +3303,8 @@ ./usr/man/man5/pkg_install.conf.5 minix-man ./usr/man/man5/pkg_summary.5 minix-man ./usr/man/man5/rc.conf.5 minix-man -./usr/man/man5/resolv.conf.5 minix-man -./usr/man/man5/resolver.5 minix-man +./usr/man/man5/resolv.conf.5 minix-man obsolete +./usr/man/man5/resolver.5 minix-man obsolete ./usr/man/man5/rhosts.5 minix-man ./usr/man/man5/serv.access.5 minix-man ./usr/man/man5/statvfs.5 minix-man @@ -3421,7 +3421,7 @@ ./usr/man/man8/newfs_v7fs.8 minix-man ./usr/man/man8/newroot.8 minix-man obsolete ./usr/man/man8/nologin.8 minix-man -./usr/man/man8/nonamed.8 minix-man +./usr/man/man8/nonamed.8 minix-man obsolete ./usr/man/man8/ossdevlinks.8 minix-man obsolete ./usr/man/man8/part.8 minix-man ./usr/man/man8/partition.8 minix-man diff --git a/etc/Makefile b/etc/Makefile index 1adef736a..e25a70dae 100644 --- a/etc/Makefile +++ b/etc/Makefile @@ -321,7 +321,6 @@ install-etc-files: .PHONY .MAKE check_DESTDIR MAKEDEV ${BINOWN} ${BINGRP} ${BINMODE} ${NETBSDSRCDIR}/etc/ ${DESTDIR}/etc/ group \ ${BINOWN} ${BINGRP} ${BINMODE} ${NETBSDSRCDIR}/etc/ ${DESTDIR}/etc/ hostname.file \ ${BINOWN} ${BINGRP} ${BINMODE} ${NETBSDSRCDIR}/etc/ ${DESTDIR}/etc/ mk.conf \ - ${BINOWN} ${BINGRP} ${BINMODE} ${NETBSDSRCDIR}/etc/ ${DESTDIR}/etc/ resolv.conf \ ${BINOWN} ${BINGRP} ${BINMODE} ${NETBSDSRCDIR}/etc/ ${DESTDIR}/etc/ motd \ ${BINOWN} ${BINGRP} ${BINMODE} ${NETBSDSRCDIR}/etc/ ${DESTDIR}/etc/ rc.conf \ ${BINOWN} ${BINGRP} ${BINMODE} ${NETBSDSRCDIR}/etc/ ${DESTDIR}/etc/ shrc \ diff --git a/etc/resolv.conf b/etc/resolv.conf deleted file mode 100644 index bcc6e4475..000000000 --- a/etc/resolv.conf +++ /dev/null @@ -1,2 +0,0 @@ -# Use Minix nonamed for now -nameserver 127.0.0.1 diff --git a/minix/commands/Makefile b/minix/commands/Makefile index d38e5d5b9..8befee314 100644 --- a/minix/commands/Makefile +++ b/minix/commands/Makefile @@ -16,7 +16,6 @@ SUBDIR= arp at backup \ loadkeys loadramdisk logger look lp \ lpd lspci mail MAKEDEV \ minix-service mount mt netconf \ - nonamed \ prep printroot \ profile progressbar \ ramdisk rarpd rawspeed readclock \ diff --git a/minix/commands/nonamed/Makefile b/minix/commands/nonamed/Makefile deleted file mode 100644 index b9a10b1d5..000000000 --- a/minix/commands/nonamed/Makefile +++ /dev/null @@ -1,4 +0,0 @@ -PROG= nonamed -MAN= nonamed.8 - -.include diff --git a/minix/commands/nonamed/nonamed.8 b/minix/commands/nonamed/nonamed.8 deleted file mode 100644 index a3e0155ec..000000000 --- a/minix/commands/nonamed/nonamed.8 +++ /dev/null @@ -1,309 +0,0 @@ -.\" These numbers should match those in nonamed.c: -.ds ST "two seconds" -.ds MT "four seconds" -.ds LT "five minutes" -.ds HT "one hour" -.ds NI "256" -.TH NONAMED 8 -.SH NAME -nonamed \- not a name daemon, but acts like one -.SH SYNOPSIS -.B nonamed -.RB [ \-Lqs ] -.RB [ \-d [\fIlevel\fP]] -.RB [ \-p -.IR port ] -.SH DESCRIPTION -.de SP -.if t .sp 0.4 -.if n .sp -.. -.B Nonamed -is not a name daemon. It can answer simple queries from -.BR /etc/hosts , -but anything else is relayed to a real name daemon. -.B Nonamed -maintaines a small cache of replies it has seen from a name daemon, and will -use this cache to minimize traffic if the machine is permanently connected -to the Internet, or to answer requests if the machine is often disconnected -from the Internet, i.e. a computer at home. -.PP -On startup -.B nonamed -sends a simple query to each of its name servers to see if one is up. This -is repeated every \*(LT in an "at home" situation, or when necessary if the -current name daemon doesn't respond. The first name server to answer is -used as the current name server to answer queries. -.PP -If no name servers are found in the DHCP data or -.BR /etc/hosts -then only the hosts file is used to answer queries, and any query for a name -not in that file gets a failure response. -.PP -.B Nonamed -accepts both UDP and TCP queries under Minix-vmd. Under standard MINIX 3 -only UDP queries are accepted. \*(NI relayed UDP queries can be outstanding -before it forgets where the first one came from. -.PP -Using the hosts file, -.B nonamed -can answer simple DNS queries to translate a host name to an IP address, or -an IP address to a host name. Suppose -.B /etc/hosts -looks like this: -.PP -.RS -.ta +15n -.nf -10.0.0.1 flotsam.cs.vu.nl\0www -10.0.0.2 jetsam.cs.vu.nl -.fi -.RE -.PP -Then queries for the host names listed can be answered with the IP addresses -to the left of them. An alias like "www" above is seen as a CNAME for the -first host name on the line, in the same domain as the first host name if -unqualified (no dots). A reverse lookup for an IP address on the left is -answered by the first host name on the right. If more than one match is -possible then all matches are put in the answer, so all IP addresses of -multihomed hosts can be listed by multiple entries in the hosts file. -.PP -Requests for names like "flotsam.cs.vu.nl.cs.vu.nl" that are often generated -on a domain search for an already fully qualified domain name -are recognized and made to fail. This kludge avoids a lot of unnecessary -requests to possibly unreachable name servers and client timeouts. -.PP -The name "localhost" in any domain is given the IP address 127.0.0.1. -.PP -.B Nonamed -employs several timeouts for efficient operation: -.PP -If no UDP reply is seen in \*(MT then a new search is started for a name -server in the hope of finding one that does work. -A failing TCP connection will also invoke a search, the -TCP connection is then made to the new name server. A client using UDP will -retry eventually, a client using TCP will notice nothing but a short delay. -If a TCP connection fails after 5 tries then an answer is sought in the -hosts file, and failing that the connection is closed. -.PP -Any TCP operation is given \*(LT to show any action before the connection is -aborted. -.PP -UDP replies from a name server are put in a cache of by default 8 (16-bit -system) or 16 kilobytes (32-bit system). New queries are -first sought in the cache, and if found answered from the cache. An entry -in the cache is expired when the resource record with the smallest TTL (time -to live) expires, unless its expire time is artificially extended by the -"%stale" parameter (see below). An answer from the cache has all TTLs -appropriately lowered, and the AA bit ("answer authoritive") is cleared. -Any request answered by stale data is refreshed as soon as -.B nonamed -notices that one of the external name daemons is reachable. -.PP -Data is only cached if it is has "no error" result code, or a "no such -domain" result code with a SOA record in the name server section, and all -records have a nonzero TTL. The %stale parameter has no effect on the -decision to cache a result. -.PP -The cache is rewritten to the cache file \*(LT after a new entry has been -added. Mere changes to the order in the cache don't cause a rewrite. -.SS Configuration through /etc/hosts -The real name servers, stale data extension, and cache size can be -configured by special entries in the hosts file. For example: -.PP -.RS -.ta +\w'172.16.24.3'u+2m +\w'%nameserver'u+2m -.nf -86400 %ttl # Answers from this file get this TTL -2419200 %stale # Stale data may linger on for 4 weeks -32768 %memory # 32k cache size -10.0.0.1 %nameserver # flotsam -172.16.24.3 %nameserver # dns1.example.com -172.16.24.6 %nameserver # dns2.example.com -.SP -10.0.0.1 flotsam.home.example.com\0www -10.0.0.2 jetsam.home.example.com -.fi -.RE -.PP -In this example we have two machines, flotsam and jetsam, that are at home. -Answers from the hosts file get a TTL of one day, by default this is \*(HT. -Normally there is no connection to the Internet, so any stale data in the -cache is allowed to linger on for 2419200 seconds (4 weeks) before it is -finally discarded. The cache size is set to 32 kilobytes. The first name -server is the flotsam. On the flotsam itself this entry is ignored, but the -jetsam will now run its requests through flotsam if possible. This means -that both flotsam and jetsam use the cache of the flotsam. The other -nameserver entries are external name servers of the Internet provider. -.PP -If no nameservers are listed in the hosts file then they are obtained from -data gathered by DHCP. This is the preferred situation. -.PP -If the hosts file contains a line that says: -.PP -.RS -.BI include " file" -.RE -.PP -Then the current hosts file is closed and the file named is read next. -.SS "Automatic calling" -If your connection to the Internet is set up on demand, either in software -on the machine that has the modem, or by a special box such as an ISDN -router, then you need to filter the name server probes that -.B nonamed -sends out every \*(LT to see if a real name daemon is reachable. These -probes need to be recognized as packets that must not trigger a call, and -that must not keep the line up. You can either filter all IP packets -destined for port 53 decimal (the -.B domain -port). This may be a bit too much, the first packet out is often a normal -DNS request (not a probe), so you may want to do better. A probe by -.B nonamed -is a nonrecursive request for the name servers of the root domain. You -can recognize them by looking at the flags, they are all off. Here is a -typical probe in hex (twenty octets per line), followed by the names of -interesting fields, and the octets values you should look for: -.PP -.RS -.nf -45 00 00 2D C8 19 00 00 1D 11 53 18 AC 10 66 41 AC 10 18 03 -00 35 00 35 00 19 79 93 00 00 00 00 00 01 00 00 00 00 00 00 -00 00 02 00 01 -.SP -ip ip ip ip ip ip ip ip ip ip ip ip si si si si di di di di -sp sp dp dp xx xx xx xx id id fl fl qd qd an an ns ns ar ar -dn ty ty cl cl -.SP -45 xx xx xx xx xx xx xx xx 11 xx xx xx xx xx xx xx xx xx xx -xx xx 00 35 xx xx xx xx xx xx 00 00 xx xx xx xx xx xx xx xx -xx xx xx xx xx -.SP -.fi -(ip = IP header, si = source IP, di = dest IP, sp = source port, dp = dest -port, id = DNS ID, fl = DNS flags, qd = query count, an = answer count, ns = -nameserver count, ar = additional records count, dn = domain (""), ty = type -(NS), cl = class (IN).) -.RE -.PP -So if a packet has octets 45, 11, 00 35, and 00 00 at the appropriate places -then don't let it cause a call. Read the documentation of your software/router -to find out how to do this. Hopefully it is possible to view the contents of -the packet that triggered the last call. If so you simply let -.B nonamed -bring up the line once with a probe. -.SS "Remote information" -The program version and name servers it is working with can be obtained with: -.PP -.RS -host \-r \-v \-c chaos \-t txt version.bind. \fIserver\fP -.RE -.PP -.I Server -is the name or IP address of the host whose name server you want to know -this of. -(This call is really an undocumented hack to ask the version numbers of the -BIND name daemon. It just had to be implemented for -.B nonamed -as well.) -.PP -The % variables in the hosts file can be viewed like this: -.PP -.RS -host \-r \-t a %nameserver. \fIserver\fP -.RE -.PP -Don't forget the dot at the end of the name. %ttl and %stale will be shown -as a dotted quad, e.g. 0.36.234.0. The proper value can be computed as 36 * -65536 + 234 * 256 + 0 = 2419200. -.SH OPTIONS -The options are only useful when debugging -.BR nonamed , -although it can be very instructive to watch DNS queries being done. -.TP -.BR \-d [\fIlevel\fP] -Set debugging level to -.I level -(by default -.BR 1 .) -Debug mode 1 makes -.B nonamed -decode and display the DNS queries and replies that it receives, sends and -relays. In debug mode 2 it prints tracing information about the internal -jobs it executes. In debug mode 3 it core dumps when an error causes it to -exit. The debugging level may also be increased by 1 at runtime by sending -signal -.B SIGUSR1 -or turned off (set to 0) with -.BR SIGUSR2 . -.TP -.RB [ \-L ] -Only accept queries coming from the local host. -.TP -.RB [ \-p " \fIport\fP] -Port to listen on instead of the normal -.B domain -port. -.TP -.RB [ \-q ] -Read the cache file with the debug level set to 2, causing its contents to -be printed, then exit. -.TP -.RB [ \-s ] -Run single: ignore hosts or cache file, only use the DHCP information. This -allows another -.B nonamed -to be run on a different interface to serve a few programs that run there. -.SH FILES -.TP 15n -/etc/hosts -Hosts to address translation table and configuration file. -.TP -/usr/run/nonamed.pid -Process ID of the currently running -.BR nonamed . -.TP -/usr/adm/nonamed.cache -Copy of the cache. Read when the program starts, written \*(LT after -something has been added to it, and written when a SIGTERM signal is -received, which is normally sent at system shutdown. -.TP -/usr/adm/dhcp.cache -Data gathered by the DHCP daemon. Among lots of other junk it lists name -servers that we should use. -.SH "SEE ALSO" -.BR gethostbyname (3), -.BR resolver (3), -.BR hosts (5), -.BR inet (8), -.BR boot (8), -.BR inetd (8), -.BR dhcpd (8). -.SP -.BR RFC-1034 -and -.BR RFC-1035 . -.SH NOTES -Do not use the %stale parameter for a PC that is directly connected to the -Internet. You run the risk of getting wrong answers, a risk that is only -worth taking for a system that is mostly disconnected from the Internet. -.PP -You can specify one or more remote name servers in -.B /etc/resolv.conf -so that nonamed isn't needed. This will save memory, but you'll lose -.BR nonamed 's -cache and its "offline" tricks. That's no problem if you can use a -neighbouring name daemon on another PC at home. -.PP -The default cache size seems to be more than enough for normal use, but if -you do decide to make it larger then don't forget to increase the stack size -of the program under standard MINIX 3. -.PP -Don't let two -.BR nonamed 's -forward queries to each other. They will pingpong a query over the -network as fast as they can. -.SH BUGS -The idea of serving "stale DNS data" will probably make some purists -violently sick... -.SH AUTHOR -Kees J. Bot (kjb@cs.vu.nl) diff --git a/minix/commands/nonamed/nonamed.c b/minix/commands/nonamed/nonamed.c deleted file mode 100644 index 5c8fe4c99..000000000 --- a/minix/commands/nonamed/nonamed.c +++ /dev/null @@ -1,2227 +0,0 @@ -/* nonamed - Not a name daemon, but plays one on TV. - * Author: Kees J. Bot - * 29 Nov 1994 - */ -static const char version[] = "2.7"; - -/* Use the file reading gethostent() family of functions. */ -#define sethostent _sethostent -#define gethostent _gethostent -#define endhostent _endhostent - -#define nil ((void*)0) -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include - -#undef HTONL -#undef HTONS -#define HTONL htonl -#define HTONS htons - -#define HTTL 3600L /* Default time to live for /etc/hosts data. */ -#define SHORT_TIMEOUT 2 /* If you expect an answer soon. */ -#define MEDIUM_TIMEOUT 4 /* Soon, but not that soon. */ -#define LONG_TIMEOUT 300 /* For stream connections to a real named. */ -#define N_IDS 256 /* Keep track of this many queries. */ -#define N_DATAMAX (4096*sizeof(char *)) /* Default response cache size. */ -#define N_NAMEDS 8 /* Max # name daemons we can keep track of. */ -#define NO_FD (-1) /* No name daemon channel here. */ -#define T_NXD ((u16_t) -1) /* A "type" signalling a nonexistent domain. */ - -/* Can't do async I/O under standard Minix, so forget about TCP. */ -#define DO_TCP (__minix_vmd || !__minix) - -/* Host data, file to store our process id in, our cache, DHCP's cache. */ -static char HOSTS[]= _PATH_HOSTS; -static char PIDFILE[]= "/usr/run/nonamed.pid"; -static char NNCACHE[]= "/usr/adm/nonamed.cache"; -static char DHCPCACHE[]= _PATH_DHCPCACHE; - -/* Magic string to head the cache file. */ -static char MAGIC[4]= "NND\2"; - -#define arraysize(a) (sizeof(a) / sizeof((a)[0])) -#define arraylimit(a) ((a) + arraysize(a)) -#define between(a, c, z) ((unsigned) ((c) - (a)) <= (unsigned) ((z) - (a))) - -/* The start of time and the far future. */ -#define IMMEDIATE ((time_t) 0) -#define NEVER ((time_t) ((time_t) -1 < 0 ? LONG_MAX : ULONG_MAX)) - -static unsigned debug; /* Debug level. */ -static time_t now; /* Current time. */ -static u32_t stale; /* Extension time for stale data. */ -static u32_t httl; /* TTL for /etc/hosts data. */ -static int reinit, done; /* Reinit config / program is done. */ -static int single; /* Run single on a nondefault interface. */ -static int localonly; /* Only accept local queries. */ -#define LOCALHOST 0x7F000001 - -static void report(const char *label) -{ - fprintf(stderr, "nonamed: %s: %s\n", label, strerror(errno)); -} - -static void fatal(const char *label) -{ - report(label); - if (debug >= 3) { fflush(nil); abort(); } - exit(1); -} - -static void *allocate(void *mem, size_t size) -{ - if ((mem= realloc(mem, size)) == nil) fatal("malloc()"); - return mem; -} - -static void deallocate(void *mem) -{ - free(mem); -} - -static char *timegmt(time_t t) -/* Simple "time in seconds to GMT time today" converter. */ -{ - unsigned h, m, s; - static char asctime[sizeof("00:00:00")]; - - s= t % 60; - t /= 60; - m= t % 60; - t /= 60; - h= t % 24; - sprintf(asctime, "%02u:%02u:%02u", h, m, s); - return asctime; -} - -static char *nowgmt(void) -{ - return timegmt(now); -} - -static char *my_ntoa(ipaddr_t addr) -{ - return inet_ntoa(*(struct in_addr *)&addr); -} - -#define PC(n) ((void) sizeof(char [sizeof(*(n)) == 1]), (char *) (n)) -#define namecpy(n1, n2) strcpy(PC(n1), PC(n2)) -#define namecat(n1, n2) strcat(PC(n1), PC(n2)) -#define namechr(n, c) ((u8_t *) strchr(PC(n), (c))) -#define namecmp(n1, n2) strcasecmp(PC(n1), PC(n2)) -#define namencmp(n1, n2, len) strncasecmp(PC(n1), PC(n2), len) - -typedef struct dns { /* A DNS packet. */ - HEADER hdr; /* DNS header. */ - u8_t data[PACKETSZ - sizeof(HEADER)]; /* DNS data. */ -} dns_t; - -/* Addres of DNS packet to octet address, or vv. */ -#define dns2oct(dp) ((u8_t *) (dp)) -#define oct2dns(dp) ((dns_t *) (dp)) - -typedef struct query { /* One cached answer to a query. */ - struct query *less; /* Less recently used. */ - struct query *more; /* More recently used. */ - time_t age; /* Time it was added. */ - time_t stale; /* Time it goes stale by TTL. */ - u16_t usage; /* Counts of queries answered. */ - u8_t flags; /* QF_REFRESH. */ - size_t size; /* Size of DNS packet. */ - dns_t dns; /* Answer to query as a DNS packet. */ -} query_t; - -#define QF_REFRESH 0x01 /* This stale data must be refreshed. */ -#define QU_SHIFT 1 /* To shift usage by when evicting. */ - -/* Size of new query_t or existing query_t. */ -#define query_allocsize(dnssize) (offsetof(query_t, dns) + (dnssize)) -#define query_size(qp) query_allocsize((qp)->size) - -static query_t *mru, *lru; /* Most and least recently used answers. */ -static int q_refresh; /* Set when an entry needs refreshing. */ - -static void pack16(u8_t *buf, u16_t s) -/* Pack a 16 bit value into a byte array. */ -{ - buf[0]= ((u8_t *) &s)[0]; - buf[1]= ((u8_t *) &s)[1]; -} - -static void pack32(u8_t *buf, u32_t l) -/* Pack a 32 bit value into a byte array. */ -{ - buf[0]= ((u8_t *) &l)[0]; - buf[1]= ((u8_t *) &l)[1]; - buf[2]= ((u8_t *) &l)[2]; - buf[3]= ((u8_t *) &l)[3]; -} - -static u16_t upack16(u8_t *buf) -/* Unpack a 16 bit value from a byte array. */ -{ - u16_t s; - - ((u8_t *) &s)[0]= buf[0]; - ((u8_t *) &s)[1]= buf[1]; - return s; -} - -static u32_t upack32(u8_t *buf) -/* Unpack a 32 bit value from a byte array. */ -{ - u32_t l; - - ((u8_t *) &l)[0]= buf[0]; - ((u8_t *) &l)[1]= buf[1]; - ((u8_t *) &l)[2]= buf[2]; - ((u8_t *) &l)[3]= buf[3]; - return l; -} - -/* Encoding of RRs: i(paddr), d(omain), l(ong), c(har), s(tring), (s)h(ort). */ -static char *encoding[] = { - "c*", /* anything unknown is c* */ - "i", /* A */ - "d", /* NS */ - "d", /* MD */ - "d", /* MF */ - "d", /* CNAME */ - "ddlllll", /* SOA */ - "d", /* MB */ - "d", /* MG */ - "d", /* MR */ - "c*", /* NULL */ - "icc*", /* WKS */ - "d", /* PTR */ - "ss", /* HINFO */ - "dd", /* MINFO */ - "hd", /* MX */ - "s*", /* TXT */ -}; - -static char *itoa(char *fmt, u32_t i) -{ - static char output[32 + 3 * sizeof(i)]; - - sprintf(output, fmt, (unsigned long) i); - return output; -} - -static char *classname(unsigned class) -/* Class name of a resource record, for debug purposes. */ -{ - static char *classes[] = { "IN", "CS", "CHAOS", "HS" }; - - if ((class - C_IN) < arraysize(classes)) return classes[class - C_IN]; - return itoa("C_%u", class); -} - -static char *typename(unsigned type) -/* Type name of a resource record, for debug purposes. */ -{ - static char type_A[][6] = { - "A", "NS", "MD", "MF", "CNAME", "SOA", "MB", "MG", "MR", "NULL", - "WKS", "PTR", "HINFO", "MINFO", "MX", "TXT", - }; - static char type_AXFR[][6] = { - "AXFR", "MAILB", "MAILA", "ANY", - }; - if ((type - T_A) < arraysize(type_A)) return type_A[type - T_A]; - if ((type - T_AXFR) < arraysize(type_AXFR)) return type_AXFR[type - T_AXFR]; - return itoa("T_%u", type); -} - -static int print_qrr(dns_t *dp, size_t size, u8_t *cp0, int q) -/* Print a query (q) or resource record (!q) from 'cp0' in a DNS packet for - * debug purposes. Return number of bytes skipped or -1 on error. - */ -{ - u8_t name[MAXDNAME+1]; - u8_t *cp; - char *ep; - u8_t *dlim, *rlim; - u16_t type, class, rdlength; - u32_t ttl; - int r; - - cp= cp0; - dlim= dns2oct(dp) + size; - r= dn_expand(dns2oct(dp), dlim, cp, name, MAXDNAME); - if (r == -1) return -1; - cp += r; - if (cp + 2 * sizeof(u16_t) > dlim) return -1; - type= ntohs(upack16(cp)); - cp += sizeof(u16_t); - class= ntohs(upack16(cp)); - cp += sizeof(u16_t); - printf("%-25s", (char *) name); - if (q) { - /* We're just printing a query segment, stop right here. */ - printf(" %8s", classname(class)); - printf(" %-5s", typename(type)); - return cp - cp0; - } - if (cp + sizeof(u32_t) + sizeof(u16_t) > dlim) return -1; - ttl= ntohl(upack32(cp)); - cp += sizeof(u32_t); - rdlength= ntohs(upack16(cp)); - cp += sizeof(u16_t); - if (cp + rdlength > dlim) return -1; - rlim = cp + rdlength; - printf(" %5lu", (unsigned long) ttl); - printf(" %s", classname(class)); - printf(" %-5s", typename(type)); - ep= type < arraysize(encoding) ? encoding[type] : encoding[0]; - while (*ep != 0) { - switch (*ep++) { - case 'i': - if (cp + sizeof(u32_t) > rlim) return -1; - printf(" %s", my_ntoa(upack32(cp))); - cp += sizeof(u32_t); - break; - case 'l': - if (cp + sizeof(u32_t) > rlim) return -1; - printf(" %ld", (long)(i32_t) ntohl(upack32(cp))); - cp += sizeof(u32_t); - break; - case 'd': - r= dn_expand(dns2oct(dp), dlim, cp, name, MAXDNAME); - if (r == -1) return -1; - printf(" %s", (char *) name); - cp += r; - break; - case 'c': - if (cp >= rlim) return -1; - printf(" %02X", *cp++); - break; - case 's': - r= *cp + 1; - if (cp + r > rlim) return -1; - printf(" \"%.*s\"", *cp, (char *) (cp + 1)); - cp += r; - break; - case 'h': - if (cp + sizeof(u16_t) > rlim) return -1; - printf(" %u", ntohs(upack16(cp))); - cp += sizeof(u16_t); - break; - } - if (*ep == '*') ep= cp < rlim ? ep-1 : ep+1; - } - return cp - cp0; -} - -static void dns_tell(int indent, dns_t *dp, size_t size) -/* Explain a DNS packet, for debug purposes. */ -{ - u8_t *cp; - int r, i; - unsigned count[4]; - static char label[4][4]= { "QD:", "AN:", "NS:", "AR:" }; - static char rcodes[][9] = { - "NOERROR", "FORMERR", "SERVFAIL", "NXDOMAIN", "NOTIMP", "REFUSED" - }; - - if (size < sizeof(HEADER)) return; - - printf("%*s", indent, ""); - printf("DNS %s:", (dp->hdr.qr) ? "reply" : "query"); - r = dp->hdr.rcode; - printf(" %s", r < arraysize(rcodes) ? rcodes[r] : itoa("ERR_%lu", r)); - if (dp->hdr.aa) printf(" AA"); - if (dp->hdr.tc) printf(" TC"); - if (dp->hdr.rd) printf(" RD"); - if (dp->hdr.ra) printf(" RA"); - if (dp->hdr.ad) printf(" AD"); - if (dp->hdr.cd) printf(" CD"); - fputc('\n', stdout); - - count[0]= ntohs(dp->hdr.qdcount); - count[1]= ntohs(dp->hdr.ancount); - count[2]= ntohs(dp->hdr.nscount); - count[3]= ntohs(dp->hdr.arcount); - cp = dp->data; - for (i= 0; i < 4; i++) { - while (count[i] > 0) { - printf("%*s", indent, ""); - printf(" %s ", label[i]); - r= print_qrr(dp, size, cp, (i == 0)); - fputc('\n', stdout); - if (r == -1) return; - cp += r; - count[i]--; - } - } -} - -static u32_t dns_ttl(dns_t *dp, size_t size, u32_t delta) -/* Compute the minimum TTL of all RRs in a DNS packet and subtract delta from - * all TTLs. (We are actually only interested in the minimum (delta = 0) or - * the subtraction (delta > 0). It was easier to roll this into one routine.) - */ -{ - u8_t *cp, *rdp, *dlim; - int r, i, hasttl, hassoa; - unsigned type, count[4]; - u32_t ttl, minimum, minttl; - unsigned rcode; - u8_t name[MAXDNAME+1]; - - hasttl= hassoa= 0; - minttl= 365*24*3600L; - dlim= dns2oct(dp) + size; - if (size < sizeof(HEADER)) return 0; - - rcode= dp->hdr.rcode; - count[0]= ntohs(dp->hdr.qdcount); - count[1]= ntohs(dp->hdr.ancount); - count[2]= ntohs(dp->hdr.nscount); - count[3]= ntohs(dp->hdr.arcount); - cp = dp->data; - for (i= 0; i < 4 && cp < dlim; i++) { - while (count[i] > 0) { - r= dn_expand(dns2oct(dp), dlim, cp, name, MAXDNAME); - if (r == -1) break; - cp += r + 2 * sizeof(u16_t); - if (i != 0) { - if (cp + sizeof(u32_t) + sizeof(u16_t) > dlim) break; - type= upack16(cp - 2 * sizeof(u16_t)); - ttl= ntohl(upack32(cp)); - ttl= ttl < delta ? 0 : ttl - delta; - if (rcode == NXDOMAIN && i == 2 && type == HTONS(T_SOA)) { - rdp= cp + sizeof(u32_t) + sizeof(u16_t); - r= dn_expand(dns2oct(dp), dlim, rdp, name, MAXDNAME); - if (r == -1) break; - rdp += r; - r= dn_expand(dns2oct(dp), dlim, rdp, name, MAXDNAME); - if (r == -1) break; - rdp += r + 4 * sizeof(u32_t); - if (rdp + sizeof(u32_t) > dlim) break; - minimum= ntohl(upack32(rdp)); - if (ttl > minimum) ttl= minimum; - hassoa= 1; - } - if (delta != 0) pack32(cp, htonl(ttl)); - if (ttl < minttl) minttl= ttl; - hasttl= 1; - cp += sizeof(u32_t); - cp += sizeof(u16_t) + ntohs(upack16(cp)); - } - count[i]--; - } - } - return ((rcode == NOERROR && hasttl) || (rcode == NXDOMAIN && hassoa)) - ? minttl : 0; -} - -/* Total cached query data. */ -static size_t n_datamax= N_DATAMAX; -static size_t n_data; - -static query_t *extract_query(query_t *qp) -/* Take a query out of the query cache. */ -{ - assert(qp != nil); - *(qp->less != nil ? &qp->less->more : &lru) = qp->more; - *(qp->more != nil ? &qp->more->less : &mru) = qp->less; - n_data -= query_size(qp); - return qp; -} - -static query_t *get_query(u8_t *name, unsigned type) -/* Find a query and if so remove it from the cache and return it. */ -{ - query_t *qp, *less; - u8_t qname[MAXDNAME+1]; - int r; - - for (qp= mru; qp != nil; qp= less) { - less= qp->less; - if (qp->stale <= now - stale) { - /* This answer has expired. */ - deallocate(extract_query(qp)); - } else { - r= dn_expand(dns2oct(&qp->dns), dns2oct(&qp->dns) + qp->size, - qp->dns.data, qname, MAXDNAME); - if (r == -1) continue; - if (namecmp(qname, name) == 0 && upack16(qp->dns.data+r) == type) { - /* Found an answer to the query. */ - return extract_query(qp); - } - } - } - return nil; -} - -static void insert_query(query_t *qp) -/* (Re)insert a query into the cache. */ -{ - *(qp->less != nil ? &qp->less->more : &lru) = qp; - *(qp->more != nil ? &qp->more->less : &mru) = qp; - n_data += query_size(qp); - - /* Try to delete the LRU while there is too much memory in use. If - * its usage count is too high then it gets a second chance. - */ - while (n_data > n_datamax && lru != nil) { - if ((lru->usage >>= QU_SHIFT) == 0 || lru->stale <= now - stale) { - deallocate(extract_query(lru)); - } else { - lru->less= mru; /* Make list circular. */ - mru->more= lru; - mru= lru; /* Move one over, making LRU the MRU. */ - lru= lru->more; - lru->less= nil; /* Break the circle. */ - mru->more= nil; - } - } - - if (debug >= 2) { - unsigned n= 0; - for (qp= mru; qp != nil; qp= qp->less) n++; - printf("%u cached repl%s, %u bytes, sbrk(0) = %u\n", - n, n == 1 ? "y" : "ies", - (unsigned) n_data, - (unsigned) sbrk(0)); - } -} - -static void put_query(query_t *qp) -/* Add a new query to the cache as the MRU. */ -{ - qp->less= mru; - qp->more= nil; - insert_query(qp); -} - -static void cache2file(void) -/* Store the cached data into the cache file. */ -{ - FILE *fp; - query_t *qp; - u8_t data[4+1+2+2]; - u16_t usage; - char newcache[sizeof(NNCACHE) + sizeof(".new")]; - - if (single) return; - - strcpy(newcache, NNCACHE); - strcat(newcache, ".new"); - - if ((fp= fopen(newcache, "w")) == nil) { - if ((errno != ENOENT && errno != EROFS) || debug >= 2) report(newcache); - return; - } - if (debug >= 2) printf("Writing %s:\n", newcache); - - /* Magic number: */ - fwrite(MAGIC, 1, sizeof(MAGIC), fp); - - for (qp= lru; qp != nil; qp= qp->more) { - if (qp->stale <= now - stale) continue; - if (debug >= 2) { - printf("Usage = %u, Age = %ld, Flags = %02X:\n", - qp->usage, (long) (now - qp->age), qp->flags); - dns_tell(2, &qp->dns, qp->size); - } - pack32(data+0, htonl(qp->age)); - data[4]= qp->flags; - pack16(data+5, htons(qp->size)); - pack16(data+7, htons(qp->usage)); - fwrite(data, 1, sizeof(data), fp); - fwrite(&qp->dns, 1, qp->size, fp); - if (ferror(fp)) break; - } - - if (ferror(fp) || fclose(fp) == EOF) { - report(newcache); - (void) unlink(newcache); - return; - } - - if (debug >= 2) printf("mv %s %s\n", newcache, NNCACHE); - if (rename(newcache, NNCACHE) < 0) { - fprintf(stderr, "nonamed: mv %s %s: %s\n", - newcache, NNCACHE, strerror(errno)); - (void) unlink(newcache); - } -} - -static void file2cache(void) -/* Read cached data from the cache file. */ -{ - query_t *qp; - FILE *fp; - u8_t data[4+1+2+2]; - size_t dlen; - - if (single) return; - - if ((fp= fopen(NNCACHE, "r")) == nil) { - if (errno != ENOENT || debug >= 2) report(NNCACHE); - return; - } - if (debug >= 2) printf("Reading %s:\n", NNCACHE); - - /* Magic number? */ - fread(data, 1, sizeof(MAGIC), fp); - if (ferror(fp) || memcmp(MAGIC, data, sizeof(MAGIC)) != 0) goto err; - - for (;;) { - fread(data, 1, sizeof(data), fp); - if (feof(fp) || ferror(fp)) break; - dlen= ntohs(upack16(data+5)); - qp= allocate(nil, query_allocsize(dlen)); - qp->age= htonl(upack32(data+0)); - qp->flags= data[4]; - if (qp->flags & QF_REFRESH) q_refresh= 1; - qp->size= dlen; - qp->usage= htons(upack16(data+7)); - fread(&qp->dns, 1, qp->size, fp); - if (feof(fp) || ferror(fp)) { - deallocate(qp); - goto err; - } - qp->stale= qp->age + dns_ttl(&qp->dns, dlen, 0); - if (debug >= 2) { - printf("Usage = %u, Age = %ld, Flags = %02X:\n", - qp->usage, (long) (now - qp->age), qp->flags); - dns_tell(2, &qp->dns, dlen); - } - put_query(qp); - } - if (ferror(fp)) { - err: - /* The cache file did not end at EOF or is otherwise a mess. */ - fprintf(stderr, "nonamed: %s: %s\n", NNCACHE, - ferror(fp) ? strerror(errno) : "Corrupt"); - while (lru != nil) deallocate(extract_query(lru)); - } - fclose(fp); -} - -typedef int handler_t(void *data, int expired); - -/* All actions are in the form of "jobs". */ -typedef struct job { - struct job *next, **prev; /* To make a job queue. */ - handler_t *handler; /* Function to handle this job. */ - time_t timeout; /* Moment it times out. */ - void *data; /* Data associated with the job. */ -} job_t; - -static job_t *queue; /* Main job queue. */ - -static void newjob(handler_t *handler, time_t timeout, void *data) -/* Create a new job with the given handler, timeout time and data. */ -{ - job_t *job, **prev; - - job= allocate(nil, sizeof(*job)); - job->handler= handler; - job->timeout= timeout; - job->data= data; - - for (prev= &queue; *prev != nil; prev= &(*prev)->next) { - if (job->timeout < (*prev)->timeout) break; - } - job->next= *prev; - job->prev= prev; - *prev= job; - if (job->next != nil) job->next->prev= &job->next; -} - -static int execjob(job_t *job, int expired) -/* Execute a job by calling the handler. Remove the job if it returns true, - * indicating that it is done. Expired is set if the job timed out. It is - * otherwise called to check for I/O. - */ -{ - if ((*job->handler)(job->data, expired)) { - *job->prev= job->next; - if (job->next != nil) job->next->prev= job->prev; - deallocate(job); - return 1; - } - return 0; -} - -static void force_expire(handler_t *handler) -/* Force jobs to expire immediately, the named searcher for instance. */ -{ - job_t *job, **prev= &queue; - - while ((job= *prev) != nil) { - if (job->handler == handler && job->timeout != IMMEDIATE) { - *prev= job->next; - if (job->next != nil) job->next->prev= prev; - newjob(job->handler, IMMEDIATE, job->data); - deallocate(job); - } else { - prev= &job->next; - } - } -} - -static int nxdomain(u8_t *name) -/* True iff the two top level components in a name are repeated in the name, - * or if in-addr.arpa is found within a name. Such things happen often in a - * search for an already fully qualified local name. For instance: - * flotsam.cs.vu.nl.cs.vu.nl. (We don't want this at boot time.) - */ -{ - u8_t *end, *top, *p; - size_t n; - - end= namechr(name, 0); - top= end; - while (top > name && *--top != '.') {} - while (top > name && *--top != '.') {} - n= end - top; - p= top; - for (;;) { - if (p == name) return 0; - if (*--p == '.') { - if (namencmp(p, top, n) == 0 && p[n] == '.') return 1; - if (namencmp(p, ".in-addr.arpa.", 14) == 0) return 1; - } - } -} - -typedef struct id2id { - u16_t id; /* ID of old query. */ - u16_t port; /* Reply port. */ - ipaddr_t ip; /* Reply address. */ -} id2id_t; - -static id2id_t id2id[N_IDS]; -static u16_t id_counter; - -static u16_t new_id(u16_t in_id, u16_t in_port, ipaddr_t in_ip) -/* An incoming UDP query must be relabeled with a new ID before it can be - * send on to a real name daemon. - */ -{ - id2id_t *idp; - u16_t id; - - id= id_counter++; - idp= &id2id[id % N_IDS]; - idp->id= in_id; - idp->port= in_port; - idp->ip= in_ip; - return htons(id); -} - -static int old_id(u16_t id, u16_t *out_id, u16_t *out_port, ipaddr_t *out_ip) -/* Translate a reply id back to the id, port, and address used in the query. - * Return true if the translation is possible. - */ -{ - id= ntohs(id); - if ((u16_t) (id_counter - id) > N_IDS) { - /* Too old. */ - return 0; - } else { - /* We know this one. */ - id2id_t *idp= &id2id[id % N_IDS]; - - if (idp->port == 0) return 0; /* Named is trying to fool us? */ - *out_id= idp->id; - *out_port= idp->port; - *out_ip= idp->ip; - idp->port= 0; - return 1; - } -} - -/* IDs used to mark my own queries to name servers, must be new_id translated - * to make them unique "on the wire". - */ -#define ID_IPSELF HTONL(0) /* "I did it myself" address. */ -#define ID_PROBE HTONS(0) /* Name server probe. */ -#define ID_REFRESH HTONS(1) /* Query to refresh a cache entry. */ - -static char *tcp_device, *udp_device; /* TCP and UDP device names. */ -static int udp_fd; /* To send or receive UDP packets. */ -static asynchio_t asyn; /* For I/O in progress. */ -static ipaddr_t my_ip; /* My IP address. */ -static u16_t my_port, named_port; /* Port numbers, normally "domain". */ - -static ipaddr_t named[N_NAMEDS]; /* Addresses of all name servers. */ -static unsigned n_nameds; /* Number of configured name daemons. */ -static unsigned i_named; /* Index to current name server. */ -static int expect; /* Set when we expect an answer. */ -static int search_ct= -1; /* Named search count and state. */ -static int dirty; /* True when new entry put in cache. */ - -#define current_named() (+named[i_named]) -#define searching() (search_ct > 0) -#define start_searching() ((void) (search_ct= -1)) -#define stop_searching() ((void) (search_ct= 0)) -#define expecting() (+expect) -#define start_expecting() ((void) (expect= 1)) -#define stop_expecting() ((void) (expect= 0)) - -static time_t filetime(const char *file) -/* Get the modified time of a file. */ -{ - struct stat st; - - return stat(file, &st) == 0 ? st.st_mtime : 0; -} - -static void init_config(ipaddr_t ifip) -/* Read name daemon list and other special stuff from the hosts file. */ -{ - struct hostent *he; - u32_t nip, hip; - static time_t hosts_time, dhcp_time; - time_t ht, dt; - - /* See if anything really changed. */ - if (((ifip ^ HTONL(LOCALHOST)) & HTONL(0xFF000000)) == 0) ifip= my_ip; - ht= filetime(HOSTS); - dt= filetime(DHCPCACHE); - if (ifip == my_ip && ht == hosts_time && dt == dhcp_time) return; - my_ip= ifip; - hosts_time= ht; - dhcp_time= dt; - - if (debug >= 2) { - printf("%s: I am nonamed %s at %s:%u\n", - nowgmt(), version, my_ntoa(my_ip), ntohs(my_port)); - } - - httl= HTONL(HTTL); - stale= 0; - n_nameds= 0; - - if (!single) { - sethostent(0); - while ((he= gethostent()) != nil) { - memcpy(&nip, he->h_addr, sizeof(u32_t)); - hip= ntohl(nip); - if (namecmp(he->h_name, "%ttl") == 0) httl= nip; - if (namecmp(he->h_name, "%stale") == 0) stale= hip; - if (namecmp(he->h_name, "%memory") == 0) n_datamax= hip; - if (namecmp(he->h_name, "%nameserver") == 0) { - if (nip != my_ip || named_port != my_port) { - if (n_nameds < N_NAMEDS) named[n_nameds++]= nip; - } - } - } - endhostent(); - } - - if (n_nameds == 0) { - /* No name daemons found in the host file. What about DHCP? */ - int fd; - dhcp_t d; - ssize_t r; - u8_t *data; - size_t len; - - if ((fd= open(DHCPCACHE, O_RDONLY)) < 0) { - if (errno != ENOENT) fatal(DHCPCACHE); - } else { - while ((r= read(fd, &d, sizeof(d))) == sizeof(d)) { - if (d.yiaddr == my_ip) break; - } - if (r < 0) fatal(DHCPCACHE); - close(fd); - - if (r == sizeof(d) && dhcp_gettag(&d, DHCP_TAG_DNS, &data, &len)) { - while (len >= sizeof(nip)) { - memcpy(&nip, data, sizeof(nip)); - data += sizeof(nip); - len -= sizeof(nip); - if (nip != my_ip || named_port != my_port) { - if (n_nameds < N_NAMEDS) named[n_nameds++]= nip; - } - } - } - } - } - i_named= 0; -} - -static handler_t job_save_cache, job_read_udp, job_find_named, job_expect_named; -#if DO_TCP -static handler_t job_setup_listen, job_listen, job_setup_connect, job_connect; -static handler_t job_read_query, job_write_query; -static handler_t job_read_reply, job_write_reply; -#endif - -static int query_hosts(u8_t *qname, unsigned type, dns_t *dp, size_t *pdlen) -/* Read the /etc/hosts file to try and answer an A or PTR query. Return - * true iff an answer can be found, with the answer copied to *dp. - */ -{ - struct hostent *he; - int i, r; - dns_t dns; - u8_t *domain; - u8_t *cp; - u8_t name[MAXDNAME+1]; - u8_t *dnvec[40]; - unsigned ancount; - struct hostent localhost; - static char *noaliases[]= { nil }; - static ipaddr_t localaddr; - static char *localaddrlist[]= { (char *) &localaddr, nil }; - - localaddr = HTONL(LOCALHOST); - - if (single) return 0; - - /* Assume we can answer. */ - dns.hdr.qr = 1; - dns.hdr.opcode = 0; - dns.hdr.aa = 1; - dns.hdr.tc = 0; - dns.hdr.rd = 0; - dns.hdr.ra = 1; - dns.hdr.unused = 0; - dns.hdr.ad = 0; - dns.hdr.cd = 0; - dns.hdr.rcode = 0; - dns.hdr.qdcount= HTONS(1); - ancount= 0; - dns.hdr.nscount= HTONS(0); - dns.hdr.arcount= HTONS(0); - - dnvec[0]= dns2oct(&dns); - dnvec[1]= nil; - cp= dns.data; - r= dn_comp(qname, cp, arraysize(dns.data), dnvec, arraylimit(dnvec)); - if (r == -1) return 0; - cp += r; - pack16(cp, type); - cp += sizeof(u16_t); - pack16(cp, HTONS(C_IN)); - cp += sizeof(u16_t); - - /* Localhost is fixed to 127.0.0.1. */ - localhost.h_name= - namencmp(qname, "localhost.", 10) == 0 ? (char *) qname : "localhost"; - localhost.h_aliases= noaliases; - localhost.h_addr_list= localaddrlist; - he= &localhost; - - sethostent(0); - do { - int type_host = NTOHS(type); - switch (type_host) { - case T_A: - if (namecmp(qname, he->h_name) == 0) { - addA: - r= dn_comp((u8_t *) he->h_name, cp, arraylimit(dns.data) - cp, - dnvec, arraylimit(dnvec)); - if (r == -1) return 0; - cp += r; - if (cp + 3 * sizeof(u16_t) + 2 * sizeof(u32_t) - > arraylimit(dns.data)) { r= -1; break; } - pack16(cp, HTONS(T_A)); - cp += sizeof(u16_t); - pack16(cp, HTONS(C_IN)); - cp += sizeof(u16_t); - pack32(cp, httl); - cp += sizeof(u32_t); - pack16(cp, HTONS(sizeof(u32_t))); - cp += sizeof(u16_t); - memcpy(cp, he->h_addr, sizeof(u32_t)); - cp += sizeof(u32_t); - ancount++; - break; - } - /*FALL THROUGH*/ - case T_CNAME: - domain= namechr(he->h_name, '.'); - for (i= 0; he->h_aliases[i] != nil; i++) { - namecpy(name, he->h_aliases[i]); - if (domain != nil && namechr(name, '.') == nil) { - namecat(name, domain); - } - if (namecmp(qname, name) == 0) { - r= dn_comp(name, cp, arraylimit(dns.data) - cp, - dnvec, arraylimit(dnvec)); - if (r == -1) break; - cp += r; - if (cp + 3 * sizeof(u16_t) - + 1 * sizeof(u32_t) > arraylimit(dns.data)) return 0; - pack16(cp, HTONS(T_CNAME)); - cp += sizeof(u16_t); - pack16(cp, HTONS(C_IN)); - cp += sizeof(u16_t); - pack32(cp, httl); - cp += sizeof(u32_t); - /* pack16(cp, htonl(RDLENGTH)) */ - cp += sizeof(u16_t); - r= dn_comp((u8_t *) he->h_name, cp, - arraylimit(dns.data) - cp, - dnvec, arraylimit(dnvec)); - if (r == -1) break; - pack16(cp - sizeof(u16_t), htons(r)); - cp += r; - ancount++; - if (type == HTONS(T_A)) goto addA; /* really wants A */ - break; - } - } - break; - case T_PTR: - if (ancount > 0) break; - if (he->h_name[0] == '%') break; - sprintf((char *) name, "%d.%d.%d.%d.in-addr.arpa", - ((u8_t *) he->h_addr)[3], - ((u8_t *) he->h_addr)[2], - ((u8_t *) he->h_addr)[1], - ((u8_t *) he->h_addr)[0]); - if (namecmp(qname, name) == 0) { - r= dn_comp(name, cp, arraylimit(dns.data) - cp, - dnvec, arraylimit(dnvec)); - if (r == -1) break; - cp += r; - if (cp + 3 * sizeof(u16_t) + 1 * sizeof(u32_t) - > arraylimit(dns.data)) { r= -1; break; } - pack16(cp, HTONS(T_PTR)); - cp += sizeof(u16_t); - pack16(cp, HTONS(C_IN)); - cp += sizeof(u16_t); - pack32(cp, httl); - cp += sizeof(u32_t); - /* pack16(cp, htonl(RDLENGTH)) */ - cp += sizeof(u16_t); - r= dn_comp((u8_t *) he->h_name, cp, - arraylimit(dns.data) - cp, dnvec, arraylimit(dnvec)); - if (r == -1) return 0; - pack16(cp - sizeof(u16_t), htons(r)); - cp += r; - ancount++; - } - break; - } - } while (r != -1 && (he= gethostent()) != nil); - endhostent(); - - if (r == -1 || ancount == 0) return 0; - - dns.hdr.ancount= htons(ancount); - memcpy(dp, &dns, *pdlen= cp - dns2oct(&dns)); - return 1; -} - -static int query_chaos(u8_t *qname, unsigned type, dns_t *dp, size_t *pdlen) -/* Report my version. Can't let BIND take all the credit. :-) */ -{ - int i, n, r; - dns_t dns; - u8_t *cp; - u8_t *dnvec[40]; - - if (type != HTONS(T_TXT) || namecmp(qname, "version.bind") != 0) return 0; - - dns.hdr.qr = 1; - dns.hdr.opcode = 0; - dns.hdr.aa = 1; - dns.hdr.tc = 0; - dns.hdr.rd = 0; - dns.hdr.ra = 1; - dns.hdr.unused = 0; - dns.hdr.ad = 0; - dns.hdr.cd = 0; - dns.hdr.rcode = 0; - dns.hdr.qdcount= HTONS(1); - dns.hdr.ancount= HTONS(1); - dns.hdr.nscount= HTONS(0); - dns.hdr.arcount= htons(n_nameds); - - dnvec[0]= dns2oct(&dns); - dnvec[1]= nil; - cp= dns.data; - r= dn_comp(qname, cp, arraysize(dns.data), dnvec, arraylimit(dnvec)); - if (r == -1) return 0; - cp += r; - pack16(cp, type); - cp += sizeof(u16_t); - pack16(cp, HTONS(C_CHAOS)); - cp += sizeof(u16_t); - - r= dn_comp(qname, cp, arraylimit(dns.data) - cp, dnvec, arraylimit(dnvec)); - if (r == -1) return 0; - cp += r; - pack16(cp, HTONS(T_TXT)); - cp += sizeof(u16_t); - pack16(cp, HTONS(C_CHAOS)); - cp += sizeof(u16_t); - pack32(cp, HTONL(0)); - cp += sizeof(u32_t); - /* pack16(cp, htonl(RDLENGTH)) */ - cp += sizeof(u16_t); - sprintf((char *) cp + 1, "nonamed %s at %s:%u", - version, my_ntoa(my_ip), ntohs(my_port)); - r= strlen((char *) cp + 1) + 1; - pack16(cp - sizeof(u16_t), htons(r)); - *cp= r-1; - cp += r; - for (n= 0, i= i_named; n < n_nameds; n++, i= (i+1) % n_nameds) { - r= dn_comp((u8_t *) "%nameserver", cp, arraylimit(dns.data) - cp, - dnvec, arraylimit(dnvec)); - if (r == -1) return 0; - cp += r; - if (cp + 3 * sizeof(u16_t) - + 2 * sizeof(u32_t) > arraylimit(dns.data)) return 0; - pack16(cp, HTONS(T_A)); - cp += sizeof(u16_t); - pack16(cp, HTONS(C_IN)); - cp += sizeof(u16_t); - pack32(cp, HTONL(0)); - cp += sizeof(u32_t); - pack16(cp, HTONS(sizeof(u32_t))); - cp += sizeof(u16_t); - memcpy(cp, &named[i], sizeof(u32_t)); - cp += sizeof(u32_t); - } - - memcpy(dp, &dns, *pdlen= cp - dns2oct(&dns)); - return 1; -} - -static void cache_reply(dns_t *dp, size_t dlen) -/* Store a DNS packet in the cache. */ -{ - int r; - query_t *qp, *less, *more; - unsigned usage; - u16_t type; - u8_t *cp; - u8_t name[MAXDNAME]; - u32_t minttl; - - if ((dp->hdr.rd && !dp->hdr.tc)) return; - if (dp->hdr.qdcount != HTONS(1)) return; - cp= dp->data; - r= dn_expand(dns2oct(dp), dns2oct(dp) + dlen, cp, name, MAXDNAME); - if (r == -1) return; - cp += r; - type= upack16(cp); - cp += sizeof(u16_t); - if (upack16(cp) != HTONS(C_IN)) return; - - /* Delete old cached data, if any. Note where it is in the LRU. */ - if ((qp= get_query(name, type)) != nil) { - less= qp->less; - more= qp->more; - usage= qp->usage; - deallocate(qp); - } else { - /* Not yet in the cache. */ - less= mru; - more= nil; - usage= 1; - } - - /* Determine minimum TTL. Discard if zero, never cache zero TTLs. */ - if ((minttl= dns_ttl(dp, dlen, 0)) == 0) return; - - /* Enter new reply in cache. */ - qp= allocate(nil, query_allocsize(dlen)); - qp->less= less; - qp->more= more; - qp->age= now; - qp->flags= 0; - qp->usage= usage; - qp->size= dlen; - memcpy(&qp->dns, dp, dlen); - qp->stale= qp->age + minttl; - insert_query(qp); - if (debug >= 1) printf("Answer cached\n"); - - /* Save the cache soon. */ - if (!dirty) { - dirty= 1; - newjob(job_save_cache, now + LONG_TIMEOUT, nil); - } -} - -static int job_save_cache(void *data, int expired) -/* Some time after the cache is changed it is written back to disk. */ -{ - if (!expired) return 0; - cache2file(); - dirty= 0; - return 1; -} - -static int compose_reply(dns_t *dp, size_t *pdlen) -/* Try to compose a reply to a request in *dp using the hosts file or - * cached data. Return answer in *dp with its size in *pdlen. Return true - * iff an answer is given. - */ -{ - size_t dlen= *pdlen; - int r, rd; - query_t *qp; - unsigned id, type, class; - u8_t *cp; - u8_t name[MAXDNAME]; - - cp= dp->data; - r= dn_expand(dns2oct(dp), dns2oct(dp) + dlen, cp, name, MAXDNAME); - if (r != -1) { - cp += r; - if (cp + 2 * sizeof(u16_t) > dns2oct(dp) + dlen) { - r= -1; - } else { - type= upack16(cp); - cp += sizeof(u16_t); - class= upack16(cp); - cp += sizeof(u16_t); - } - } - - /* Remember ID and RD. */ - id= dp->hdr.id; - rd= dp->hdr.rd; - - if (r == -1) { - /* Malformed query, reply "FORMERR". */ - dp->hdr.tc = 0; - dp->hdr.qr = 1; - dp->hdr.aa = 1; - dp->hdr.unused = 0; - dp->hdr.ra = 1; - dp->hdr.rcode = FORMERR; - } else - if (class == HTONS(C_IN) && query_hosts(name, type, dp, pdlen)) { - /* Answer to this query is in the hosts file. */ - dlen= *pdlen; - } else - if (class == HTONS(C_IN) && (qp= get_query(name, type)) != nil) { - /* Answer to this query is present in the cache. */ - memcpy(dp, &qp->dns, dlen= qp->size); - dp->hdr.aa = 1; - (void) dns_ttl(dp, dlen, now - qp->age); - if (rd) { - if (qp->stale <= now) { - qp->flags |= QF_REFRESH; - q_refresh= 1; - } - qp->usage++; - } - put_query(qp); - } else - if (class == HTONS(C_CHAOS) && query_chaos(name, type, dp, pdlen)) { - /* Return our version numbers. */ - dlen= *pdlen; - } else - if (n_nameds == 0 || nxdomain(name)) { - /* No real name daemon present, or this name has a repeated top level - * domain sequence. Reply "no such domain". - */ - dp->hdr.tc = 0; - dp->hdr.qr = 1; - dp->hdr.aa = 1; - dp->hdr.unused = 0; - dp->hdr.ra = 1; - dp->hdr.rcode = NXDOMAIN; - } else - if (!rd) { - /* "Recursion Desired" is off, so don't bother to relay. */ - dp->hdr.tc = 0; - dp->hdr.qr = 1; - dp->hdr.unused = 0; - dp->hdr.ra = 1; - dp->hdr.rcode = NOERROR; - } else { - /* Caller needs to consult with a real name daemon. */ - return 0; - } - - /* Copy ID and RD back to answer. */ - dp->hdr.id= id; - dp->hdr.rd = rd; - *pdlen= dlen; - return 1; -} - -typedef struct udp_dns { /* One DNS packet over UDP. */ - udp_io_hdr_t hdr; /* UDP header (source/destination). */ - dns_t dns; /* DNS packet. */ -} udp_dns_t; - -static void refresh_cache(void) -/* Find a stale entry in the cache that was used to answer a query, and send - * a request to a name server that should refresh this entry. - */ -{ - query_t *qp; - unsigned type; - int r; - u8_t *cp; - size_t dlen, ulen; - u8_t qname[MAXDNAME+1]; - u8_t *dnvec[40]; - udp_dns_t udp; - - if (!q_refresh) return; - for (qp= lru; qp != nil; qp= qp->more) { - if ((qp->flags & QF_REFRESH) && qp->stale > now - stale) break; - } - if (qp == nil) { - q_refresh= 0; - return; - } - - /* Found one to refresh. */ - qp->flags &= ~QF_REFRESH; - r= dn_expand(dns2oct(&qp->dns), dns2oct(&qp->dns) + qp->size, - qp->dns.data, qname, MAXDNAME); - if (r == -1) return; - type= upack16(qp->dns.data+r); - - dnvec[0]= dns2oct(&udp.dns); - dnvec[1]= nil; - cp= udp.dns.data; - r= dn_comp(qname, cp, arraysize(udp.dns.data), dnvec, arraylimit(dnvec)); - if (r == -1) return; - cp += r; - pack16(cp, type); - cp += sizeof(u16_t); - pack16(cp, HTONS(C_IN)); - cp += sizeof(u16_t); - dlen= cp - dns2oct(&udp.dns); - - udp.dns.hdr.id= new_id(ID_REFRESH, my_port, ID_IPSELF); - udp.dns.hdr.qr = 0; - udp.dns.hdr.opcode = 0; - udp.dns.hdr.aa = 0; - udp.dns.hdr.tc = 0; - udp.dns.hdr.rd = 1; - - udp.dns.hdr.ra = 0; - udp.dns.hdr.unused = 0; - udp.dns.hdr.ad = 0; - udp.dns.hdr.cd = 0; - udp.dns.hdr.rcode = 0; - udp.dns.hdr.qdcount= HTONS(1); - udp.dns.hdr.ancount= HTONS(0); - udp.dns.hdr.nscount= HTONS(0); - udp.dns.hdr.arcount= HTONS(0); - - udp.hdr.uih_dst_addr= current_named(); - udp.hdr.uih_dst_port= named_port; - udp.hdr.uih_ip_opt_len= 0; - udp.hdr.uih_data_len= dlen; - - if (debug >= 1) { - printf("Refresh to %s:%u:\n", - my_ntoa(current_named()), ntohs(named_port)); - dns_tell(0, &udp.dns, dlen); - } - ulen= offsetof(udp_dns_t, dns) + dlen; - if (write(udp_fd, &udp, ulen) < 0) fatal(udp_device); -} - -static int job_read_udp(void *data, int expired) -/* Read UDP queries and replies. */ -{ - ssize_t ulen; - size_t dlen; - static udp_dns_t udp; - u16_t id, port; - ipaddr_t ip; - time_t dtime; - - assert(!expired); - - /* Try to read a packet. */ - ulen= asyn_read(&asyn, udp_fd, &udp, sizeof(udp)); - dlen= ulen - offsetof(udp_dns_t, dns); - - if (ulen == -1) { - if (errno == EINPROGRESS && !expired) return 0; - if (errno == EIO) fatal(udp_device); - - if (debug >= 2) { - printf("%s: UDP read: %s\n", nowgmt(), strerror(errno)); - } - } else { - if (debug >= 2) { - printf("%s: UDP read, %d bytes\n", nowgmt(), (int) ulen); - } - } - - /* Restart this job no matter what. */ - newjob(job_read_udp, NEVER, nil); - - if (ulen < (ssize_t) (sizeof(udp_io_hdr_t) + sizeof(HEADER))) return 1; - - if (debug >= 1) { - printf("%s:%u UDP ", my_ntoa(udp.hdr.uih_src_addr), - ntohs(udp.hdr.uih_src_port)); - dns_tell(0, &udp.dns, dlen); - } - - /* Check, and if necessary reinitialize my configuration. */ - init_config(udp.hdr.uih_dst_addr); - - if (udp.dns.hdr.qr) { - /* This is a remote named reply, not a query. */ - - /* Response to a query previously relayed? */ - if (!old_id(udp.dns.hdr.id, &id, &port, &ip)) return 1; - - if (ip == ID_IPSELF && id == ID_PROBE) { - if (searching()) { - /* We have found a name server! */ - int i; - - /* In my list? */ - for (i= 0; i < n_nameds; i++) { - if (named[i] == udp.hdr.uih_src_addr) { - i_named= i; - if (debug >= 1) { - printf("Current named = %s\n", - my_ntoa(current_named())); - } - stop_searching(); - force_expire(job_find_named); - } - } - } - } - - /* We got an answer, so stop worrying. */ - if (expecting()) { - stop_expecting(); - force_expire(job_expect_named); - } - - /* Put the information in the cache. */ - cache_reply(&udp.dns, dlen); - - /* Refresh a cached entry that was used when stale. */ - refresh_cache(); - - /* Discard reply to myself. */ - if (ip == ID_IPSELF) return 1; - - /* Send the reply to the process that asked for it. */ - udp.dns.hdr.id= id; - udp.hdr.uih_dst_addr= ip; - udp.hdr.uih_dst_port= port; - if (debug >= 1) printf("To client %s:%u\n", my_ntoa(ip), ntohs(port)); - } else { - /* A query. */ - if (udp.dns.hdr.qdcount != HTONS(1)) return 1; - - if(localonly) { - /* Check if it's a local query. */ - if(ntohl(udp.hdr.uih_src_addr) != LOCALHOST) { - syslog(LOG_WARNING, "nonamed: dropped query from %s", - my_ntoa(udp.hdr.uih_src_addr)); - return 1; - } - } - - /* Try to compose a reply from local data. */ - if (compose_reply(&udp.dns, &dlen)) { - udp.hdr.uih_dst_addr= udp.hdr.uih_src_addr; - udp.hdr.uih_dst_port= udp.hdr.uih_src_port; - udp.hdr.uih_ip_opt_len= 0; - udp.hdr.uih_data_len= dlen; - ulen= offsetof(udp_dns_t, dns) + dlen; - - /* Send an UDP DNS reply. */ - if (debug >= 1) { - printf("%s:%u UDP ", my_ntoa(udp.hdr.uih_dst_addr), - ntohs(udp.hdr.uih_dst_port)); - dns_tell(0, &udp.dns, dlen); - } - } else { - /* Let a real name daemon handle the query. */ - udp.dns.hdr.id= new_id(udp.dns.hdr.id, - udp.hdr.uih_src_port, udp.hdr.uih_src_addr); - udp.hdr.uih_dst_addr= current_named(); - udp.hdr.uih_dst_port= named_port; - if (!expecting()) { - start_expecting(); - newjob(job_expect_named, now + MEDIUM_TIMEOUT, nil); - } - if (debug >= 1) { - printf("To named %s:%u\n", - my_ntoa(current_named()), ntohs(named_port)); - } - } - } - if (write(udp_fd, &udp, ulen) < 0) fatal(udp_device); - return 1; -} - -#if DO_TCP - -typedef struct data_cl { /* Data for connect or listen jobs. */ - int fd; /* Open TCP channel. */ - int dn_fd; /* TCP channel to the name daemon. */ - int retry; /* Retrying a connect? */ - nwio_tcpcl_t tcpcl; /* Flags. */ -} data_cl_t; - -typedef struct data_rw { /* Data for TCP read or write jobs. */ - int r_fd; /* Read from this TCP channel. */ - int w_fd; /* And write to this TCP channel. */ - struct data_rw *rev; /* Optional reverse TCP channel. */ - u8_t *buf; /* Buffer for bytes to transfer. */ - ssize_t offset; /* Offset in buf to r/w at. */ - size_t size; /* Size of buf. */ -} data_rw_t; - -static int job_setup_listen(void *data, int expired) -/* Set up a listening channel for TCP DNS queries. */ -{ - data_cl_t *data_cl= data; - nwio_tcpconf_t tcpconf; - nwio_tcpopt_t tcpopt; - int fd; - - if (!expired) return 0; - if (debug >= 2) printf("%s: Setup listen\n", nowgmt()); - - if (data_cl == nil) { - if ((fd= open(tcp_device, O_RDWR)) < 0) { - if (errno != EMFILE) report(tcp_device); - newjob(job_setup_listen, now + SHORT_TIMEOUT, nil); - return 1; - } - - tcpconf.nwtc_flags= NWTC_SHARED | NWTC_LP_SET | NWTC_UNSET_RA - | NWTC_UNSET_RP; - tcpconf.nwtc_locport= my_port; - if (ioctl(fd, NWIOSTCPCONF, &tcpconf) == -1) fatal(tcp_device); - - tcpopt.nwto_flags= NWTO_DEL_RST; - if (ioctl(fd, NWIOSTCPOPT, &tcpopt) == -1) fatal(tcp_device); - - data_cl= allocate(nil, sizeof(*data_cl)); - data_cl->fd= fd; - data_cl->tcpcl.nwtcl_flags= 0; - } - /* And listen. */ - newjob(job_listen, NEVER, data_cl); - return 1; -} - -static int job_listen(void *data, int expired) -/* A connection on the TCP DNS query channel. */ -{ - data_cl_t *data_cl= data; - - /* Wait for a client. */ - if (asyn_ioctl(&asyn, data_cl->fd, NWIOTCPLISTEN, &data_cl->tcpcl) < 0) { - if (errno == EINPROGRESS) return 0; - report(tcp_device); - - /* Try again after a short time. */ - newjob(job_setup_listen, now + SHORT_TIMEOUT, data_cl); - return 1; - } - if (debug >= 2) printf("%s: Listen\n", nowgmt()); - - /* Immediately resume listening. */ - newjob(job_setup_listen, IMMEDIATE, nil); - - /* Set up a connect to the real name daemon. */ - data_cl->retry= 0; - newjob(job_setup_connect, IMMEDIATE, data_cl); - return 1; -} - -static void start_relay(int fd, int dn_fd) -/* Start one or two read jobs after job_setup_connect() or job_connect(). */ -{ - data_rw_t *query; /* Client to DNS daemon relay. */ - data_rw_t *reply; /* DNS daemon to client relay. */ - - query= allocate(nil, sizeof(*query)); - query->r_fd= fd; - query->buf= allocate(nil, sizeof(u16_t)); - query->offset= 0; - query->size= sizeof(u16_t); - if (dn_fd == NO_FD) { - /* Answer mode. */ - query->w_fd= fd; - query->rev= nil; - } else { - /* Relay mode. */ - reply= allocate(nil, sizeof(*reply)); - reply->r_fd= dn_fd; - reply->w_fd= fd; - reply->buf= allocate(nil, sizeof(u16_t)); - reply->offset= 0; - reply->size= sizeof(u16_t); - reply->rev= query; - query->w_fd= dn_fd; - query->rev= reply; - newjob(job_read_reply, now + LONG_TIMEOUT, reply); - } - newjob(job_read_query, now + LONG_TIMEOUT, query); -} - -static void close_relay(data_rw_t *data_rw) -/* Close a relay channel. */ -{ - if (data_rw->rev != nil) { - /* Other end still active, signal EOF. */ - (void) ioctl(data_rw->w_fd, NWIOTCPSHUTDOWN, nil); - data_rw->rev->rev= nil; - } else { - /* Close both ends down. */ - asyn_close(&asyn, data_rw->r_fd); - close(data_rw->r_fd); - if (data_rw->w_fd != data_rw->r_fd) { - asyn_close(&asyn, data_rw->w_fd); - close(data_rw->w_fd); - } - } - deallocate(data_rw->buf); - deallocate(data_rw); -} - -static int job_setup_connect(void *data, int expired) -/* Set up a connect for a TCP channel to the real name daemon. */ -{ - nwio_tcpconf_t tcpconf; - int dn_fd; - data_cl_t *data_cl= data; - - if (!expired) return 0; - if (debug >= 2) printf("%s: Setup connect\n", nowgmt()); - - if (n_nameds == 0) { - /* No name daemons to relay to, answer myself. */ - start_relay(data_cl->fd, NO_FD); - deallocate(data_cl); - return 1; - } - - if ((dn_fd= open(tcp_device, O_RDWR)) < 0) { - if (errno != EMFILE) report(tcp_device); - if (++data_cl->retry < 5) { - /* Retry. */ - newjob(job_setup_connect, now + SHORT_TIMEOUT, data_cl); - } else { - /* Reply myself (bound to fail). */ - start_relay(data_cl->fd, NO_FD); - deallocate(data_cl); - } - return 1; - } - - tcpconf.nwtc_flags= NWTC_LP_SEL | NWTC_SET_RA | NWTC_SET_RP; - tcpconf.nwtc_remaddr= current_named(); - tcpconf.nwtc_remport= named_port; - if (ioctl(dn_fd, NWIOSTCPCONF, &tcpconf) == -1) fatal(tcp_device); - - /* And connect. */ - data_cl->dn_fd= dn_fd; - data_cl->tcpcl.nwtcl_flags= 0; - newjob(job_connect, NEVER, data_cl); - return 1; -} - -static int job_connect(void *data, int expired) -/* Connect to a TCP DNS query channel. */ -{ - data_cl_t *data_cl= data; - - /* Try to connect. */ - if (asyn_ioctl(&asyn, data_cl->dn_fd, NWIOTCPCONN, &data_cl->tcpcl) < 0) { - if (errno == EINPROGRESS) return 0; - if (errno == EIO) fatal(tcp_device); - - /* Connection refused. */ - if (debug >= 2) printf("%s: Connect: %s\n", nowgmt(), strerror(errno)); - asyn_close(&asyn, data_cl->dn_fd); - close(data_cl->dn_fd); - data_cl->dn_fd= NO_FD; - if (++data_cl->retry < 5) { - /* Search a new name daemon. */ - if (!searching()) { - start_searching(); - force_expire(job_find_named); - } - newjob(job_setup_connect, NEVER, data_cl); - return 1; - } - /* Reply with a failure eventually. */ - } - if (debug >= 2) printf("%s: Connect\n", nowgmt()); - - /* Read the query from the user, send on to the name daemon, etc. */ - start_relay(data_cl->fd, data_cl->dn_fd); - deallocate(data_cl); - return 1; -} - -static void tcp_dns_tell(int fd, u8_t *buf) -/* Tell about a DNS packet on a TCP channel. */ -{ - nwio_tcpconf_t tcpconf; - - if (ioctl(fd, NWIOGTCPCONF, &tcpconf) < 0) { - printf("??\?:?? TCP "); - } else { - printf("%s:%u TCP ", my_ntoa(tcpconf.nwtc_remaddr), - ntohs(tcpconf.nwtc_remport)); - } - dns_tell(0, oct2dns(buf + sizeof(u16_t)), ntohs(upack16(buf))); -} - -static int job_read_query(void *data, int expired) -/* Read TCP queries from the client. */ -{ - data_rw_t *data_rw= data; - ssize_t count; - - /* Try to read count bytes. */ - count= asyn_read(&asyn, data_rw->r_fd, - data_rw->buf + data_rw->offset, - data_rw->size - data_rw->offset); - - if (count < 0) { - if (errno == EINPROGRESS && !expired) return 0; - if (errno == EIO) fatal(tcp_device); - - /* Remote end is late, or an error occurred. */ - if (debug >= 2) { - printf("%s: TCP read query: %s\n", nowgmt(), strerror(errno)); - } - close_relay(data_rw); - return 1; - } - - if (debug >= 2) { - printf("%s: TCP read query, %d/%u bytes\n", - nowgmt(), data_rw->offset + count, data_rw->size); - } - if (count == 0) { - /* EOF. */ - close_relay(data_rw); - return 1; - } - data_rw->offset += count; - if (data_rw->offset == data_rw->size) { - data_rw->size= sizeof(u16_t) + ntohs(upack16(data_rw->buf)); - if (data_rw->size < sizeof(u16_t)) { - /* Malformed. */ - close_relay(data_rw); - return 1; - } - if (data_rw->offset < data_rw->size) { - /* Query not complete, read more. */ - data_rw->buf= allocate(data_rw->buf, data_rw->size); - newjob(job_read_query, now + LONG_TIMEOUT, data_rw); - return 1; - } - } - - if (data_rw->size < sizeof(u16_t) + sizeof(dns_hdr_t)) { - close_relay(data_rw); - return 1; - } - if (debug >= 1) tcp_dns_tell(data_rw->r_fd, data_rw->buf); - - /* Relay or reply. */ - if (data_rw->w_fd != data_rw->r_fd) { - /* We have a real name daemon to do the work. */ - data_rw->offset= 0; - newjob(job_write_query, now + LONG_TIMEOUT, data_rw); - } else { - /* No real name daemons or none reachable, so use the hosts file. */ - dns_t *dp; - size_t dlen; - - if (data_rw->size < sizeof(u16_t) + PACKETSZ) { - data_rw->buf= allocate(data_rw->buf, sizeof(u16_t) + PACKETSZ); - } - - /* Build a reply packet. */ - dp= oct2dns(data_rw->buf + sizeof(u16_t)); - dlen= data_rw->size - sizeof(u16_t); - if (!compose_reply(dp, &dlen)) { - /* We're told to ask a name daemon, but that won't work. */ - close_relay(data_rw); - return 1; - } - - /* Start a reply write. */ - pack16(data_rw->buf, htons(dlen)); - data_rw->size= sizeof(u16_t) + dlen; - data_rw->buf= allocate(data_rw->buf, data_rw->size); - data_rw->offset= 0; - newjob(job_write_reply, now + LONG_TIMEOUT, data_rw); - } - return 1; -} - -static int job_write_query(void *data, int expired) -/* Relay a TCP query to the name daemon. */ -{ - data_rw_t *data_rw= data; - ssize_t count; - - /* Try to write count bytes to the name daemon. */ - count= asyn_write(&asyn, data_rw->w_fd, - data_rw->buf + data_rw->offset, - data_rw->size - data_rw->offset); - - if (count <= 0) { - if (errno == EINPROGRESS && !expired) return 0; - if (errno == EIO) fatal(tcp_device); - - /* A write expired or failed (usually a broken connection.) */ - if (debug >= 2) { - printf("%s: TCP write query: %s\n", nowgmt(), strerror(errno)); - } - close_relay(data_rw); - return 1; - } - - if (debug >= 2) { - printf("%s: TCP write query, %d/%u bytes\n", - nowgmt(), data_rw->offset + count, data_rw->size); - } - data_rw->offset += count; - if (data_rw->offset < data_rw->size) { - /* Partial write, continue. */ - newjob(job_write_query, now + LONG_TIMEOUT, data_rw); - return 1; - } - if (debug >= 1) tcp_dns_tell(data_rw->w_fd, data_rw->buf); - - /* Query fully send on, go read more queries. */ - data_rw->offset= 0; - data_rw->size= sizeof(u16_t); - newjob(job_read_query, now + LONG_TIMEOUT, data_rw); - return 1; -} - -static int job_read_reply(void *data, int expired) -/* Read a TCP reply from the real name daemon. */ -{ - data_rw_t *data_rw= data; - ssize_t count; - - /* Try to read count bytes. */ - count= asyn_read(&asyn, data_rw->r_fd, - data_rw->buf + data_rw->offset, - data_rw->size - data_rw->offset); - - if (count < 0) { - if (errno == EINPROGRESS && !expired) return 0; - if (errno == EIO) fatal(tcp_device); - - /* Remote end is late, or an error occurred. */ - if (debug >= 2) { - printf("%s: TCP read reply: %s\n", nowgmt(), strerror(errno)); - } - close_relay(data_rw); - return 1; - } - - if (debug >= 2) { - printf("%s: TCP read reply, %d/%u bytes\n", - nowgmt(), data_rw->offset + count, data_rw->size); - } - if (count == 0) { - /* EOF. */ - close_relay(data_rw); - return 1; - } - data_rw->offset += count; - if (data_rw->offset == data_rw->size) { - data_rw->size= sizeof(u16_t) + ntohs(upack16(data_rw->buf)); - if (data_rw->size < sizeof(u16_t)) { - /* Malformed. */ - close_relay(data_rw); - return 1; - } - if (data_rw->offset < data_rw->size) { - /* Reply not complete, read more. */ - data_rw->buf= allocate(data_rw->buf, data_rw->size); - newjob(job_read_reply, now + LONG_TIMEOUT, data_rw); - return 1; - } - } - if (debug >= 1) tcp_dns_tell(data_rw->r_fd, data_rw->buf); - - /* Reply fully read, send it on. */ - data_rw->offset= 0; - newjob(job_write_reply, now + LONG_TIMEOUT, data_rw); - return 1; -} - -static int job_write_reply(void *data, int expired) -/* Send a TCP reply to the client. */ -{ - data_rw_t *data_rw= data; - ssize_t count; - - /* Try to write count bytes to the client. */ - count= asyn_write(&asyn, data_rw->w_fd, - data_rw->buf + data_rw->offset, - data_rw->size - data_rw->offset); - - if (count <= 0) { - if (errno == EINPROGRESS && !expired) return 0; - if (errno == EIO) fatal(tcp_device); - - /* A write expired or failed (usually a broken connection.) */ - if (debug >= 2) { - printf("%s: TCP write reply: %s\n", nowgmt(), strerror(errno)); - } - close_relay(data_rw); - return 1; - } - - if (debug >= 2) { - printf("%s: TCP write reply, %d/%u bytes\n", - nowgmt(), data_rw->offset + count, data_rw->size); - } - data_rw->offset += count; - if (data_rw->offset < data_rw->size) { - /* Partial write, continue. */ - newjob(job_write_reply, now + LONG_TIMEOUT, data_rw); - return 1; - } - if (debug >= 1) tcp_dns_tell(data_rw->w_fd, data_rw->buf); - - /* Reply fully send on, go read more replies (or queries). */ - data_rw->offset= 0; - data_rw->size= sizeof(u16_t); - newjob(data_rw->w_fd != data_rw->r_fd ? job_read_reply : job_read_query, - now + LONG_TIMEOUT, data_rw); - return 1; -} -#else /* !DO_TCP */ - -static int job_dummy(void *data, int expired) -{ - return 1; -} -#define job_setup_listen job_dummy -#define job_setup_connect job_dummy -#endif /* !DO_TCP */ - -static void named_probe(ipaddr_t ip) -/* Send a probe to a name daemon, like 'host -r -t ns . '. */ -{ - udp_dns_t udp; -# define dlen (offsetof(dns_t, data) + 5) -# define ulen (offsetof(udp_dns_t, dns) + dlen) - - /* Send a simple DNS query that all name servers can answer easily: - * "What are the name servers for the root domain?" - */ - udp.dns.hdr.id= new_id(ID_PROBE, my_port, ID_IPSELF); - udp.dns.hdr.qr = 0; - udp.dns.hdr.opcode = 0; - udp.dns.hdr.aa = 0; - udp.dns.hdr.tc = 0; - udp.dns.hdr.rd = 0; - udp.dns.hdr.ra = 0; - udp.dns.hdr.unused = 0; - udp.dns.hdr.ad = 0; - udp.dns.hdr.cd = 0; - udp.dns.hdr.rcode = 0; - udp.dns.hdr.qdcount= HTONS(1); - udp.dns.hdr.ancount= HTONS(0); - udp.dns.hdr.nscount= HTONS(0); - udp.dns.hdr.arcount= HTONS(0); - - udp.dns.data[0] = 0; /* Null name. */ - pack16(udp.dns.data+1, HTONS(T_NS)); - pack16(udp.dns.data+3, HTONS(C_IN)); - if (debug >= 1) { - printf("PROBE %s ", my_ntoa(ip)); - dns_tell(0, &udp.dns, dlen); - } - - udp.hdr.uih_dst_addr= ip; - udp.hdr.uih_dst_port= named_port; - udp.hdr.uih_ip_opt_len= 0; - udp.hdr.uih_data_len= dlen; - - if (write(udp_fd, &udp, ulen) < 0) fatal(udp_device); -#undef dlen -#undef ulen -} - -static int job_find_named(void *data, int expired) -/* Look for a real name daemon to answer real DNS queries. */ -{ - if (!expired) return 0; - if (debug >= 2) printf("%s: Find named\n", nowgmt()); - - /* New search? */ - if (search_ct < 0) { - search_ct= n_nameds; - i_named= -1; - } - - if (--search_ct < 0) { - /* Forced end of search (named response!), or end of search with - * nothing found. Search again after a long time. - */ - newjob(job_find_named, - (stale > 0 || i_named > 0) ? now + LONG_TIMEOUT : NEVER, nil); - force_expire(job_setup_connect); - return 1; - } - - /* Send a named probe. */ - i_named= (i_named+1) % n_nameds; - named_probe(current_named()); - - /* Schedule the next call. */ - newjob(job_find_named, now + SHORT_TIMEOUT, nil); - return 1; -} - -static int job_expect_named(void *data, int expired) -/* The real name server is expected to answer by now. */ -{ - if (!expired) return 0; - if (debug >= 2) printf("%s: Expect named\n", nowgmt()); - - if (expecting() && !searching()) { - /* No answer yet, start searching. */ - start_searching(); - force_expire(job_find_named); - } - return 1; -} - -static void sig_handler(int sig) -/* A signal forces a search for a real name daemon, etc. */ -{ - switch (sig) { - case SIGINT: - case SIGTERM: done= 1; break; - case SIGHUP: reinit= 1; break; - case SIGUSR1: debug++; break; - case SIGUSR2: debug= 0; break; - } -} - -static void usage(void) -{ - fprintf(stderr, "Usage: nonamed [-qs] [-d[level]] [-p port]\n"); - exit(1); -} - -int main(int argc, char **argv) -{ - job_t *job; - nwio_udpopt_t udpopt; - int i; - struct servent *servent; - struct sigaction sa; - FILE *fp; - int quit= 0; - - /* Debug output must be line buffered. */ - setvbuf(stdout, nil, _IOLBF, 0); - - /* DNS service port number? */ - if ((servent= getservbyname("domain", nil)) == nil) { - fprintf(stderr, "nonamed: \"domain\": unknown service\n"); - exit(1); - } - my_port= servent->s_port; - named_port= servent->s_port; - - i= 1; - while (i < argc && argv[i][0] == '-') { - char *opt= argv[i++] + 1, *end; - - if (opt[0] == '-' && opt[1] == 0) break; - - switch (*opt++) { - case 'd': /* Debug level. */ - debug= 1; - if (between('0', *opt, '9')) debug= strtoul(opt, &opt, 10); - break; - case 'p': /* Port to listen to (for testing.) */ - if (*opt == 0) { - if (i == argc) usage(); - opt= argv[i++]; - } - my_port= htons(strtoul(opt, &end, 0)); - if (opt == end || *end != 0) usage(); - opt= end; - break; - case 's': - single= 1; - break; - case 'q': /* Quit after printing cache contents. */ - quit= 1; - break; - case 'L': - localonly= 1; - break; - default: - usage(); - } - } - if (i != argc) usage(); - - if (quit) { - /* Oops, just having a look at the cache. */ - debug= 2; - now= time(nil); - n_datamax= -1; - file2cache(); - return 0; - } - - /* Don't die on broken pipes, reinitialize on hangup, etc. */ - sa.sa_handler= SIG_IGN; - sigemptyset(&sa.sa_mask); - sa.sa_flags= 0; - sigaction(SIGPIPE, &sa, nil); - sa.sa_handler= sig_handler; - sigaction(SIGINT, &sa, nil); - sigaction(SIGHUP, &sa, nil); - sigaction(SIGUSR1, &sa, nil); - sigaction(SIGUSR2, &sa, nil); - sigaction(SIGTERM, &sa, nil); - - /* TCP and UDP device names. */ - if ((tcp_device= getenv("TCP_DEVICE")) == nil) tcp_device= TCP_DEVICE; - if ((udp_device= getenv("UDP_DEVICE")) == nil) udp_device= UDP_DEVICE; - - /* Open an UDP channel for incoming DNS queries. */ - if ((udp_fd= open(udp_device, O_RDWR)) < 0) fatal(udp_device); - - udpopt.nwuo_flags= NWUO_EXCL | NWUO_LP_SET | NWUO_EN_LOC | NWUO_DI_BROAD - | NWUO_RP_ANY | NWUO_RA_ANY | NWUO_RWDATALL | NWUO_DI_IPOPT; - udpopt.nwuo_locport= my_port; - if (ioctl(udp_fd, NWIOSUDPOPT, &udpopt) == -1 - || ioctl(udp_fd, NWIOGUDPOPT, &udpopt) == -1 - ) { - fatal(udp_device); - } - - /* The current time is... */ - now= time(nil); - - /* Read configuration and data cached by the previous nonamed. */ - init_config(udpopt.nwuo_locaddr); - file2cache(); - - if (!single) { - /* Save process id. */ - if ((fp= fopen(PIDFILE, "w")) != nil) { - fprintf(fp, "%u\n", (unsigned) getpid()); - fclose(fp); - } - } - - /* Jobs that start the ball rolling. */ - newjob(job_read_udp, NEVER, nil); - newjob(job_setup_listen, IMMEDIATE, nil); - newjob(job_find_named, IMMEDIATE, nil); - - /* Open syslog. */ - openlog("nonamed", LOG_PID, LOG_DAEMON); - - while (!done) { - /* There is always something in the queue. */ - assert(queue != nil); - - /* Any expired jobs? */ - while (queue->timeout <= now) { - (void) execjob(queue, 1); - assert(queue != nil); - } - - /* Check I/O jobs. */ - for (job= queue; job != nil; job= job->next) { - if (execjob(job, 0)) break; - } - - if (queue->timeout != IMMEDIATE) { - struct timeval tv, *tvp; - - if (debug >= 2) printf("%s: I/O wait", nowgmt()); - - if (queue->timeout != NEVER) { - tv.tv_sec= queue->timeout; - tv.tv_usec= 0; - tvp= &tv; - if (debug >= 2) printf(" (expires %s)\n", timegmt(tv.tv_sec)); - } else { - tvp= nil; - if (debug >= 2) fputc('\n', stdout); - } - fflush(stdout); - - if (asyn_wait(&asyn, 0, tvp) < 0) { - if (errno != EINTR && errno != EAGAIN) fatal("fwait()"); - } - now= time(nil); - } - - if (reinit) { - /* A hangup makes us go back to square one. */ - reinit= 0; - if (ioctl(udp_fd, NWIOGUDPOPT, &udpopt) == -1) fatal(udp_device); - init_config(udpopt.nwuo_locaddr); - start_searching(); - force_expire(job_find_named); - } - } - cache2file(); - (void) unlink(PIDFILE); - if (debug >= 2) printf("sbrk(0) = %u\n", (unsigned) sbrk(0)); - return 0; -} diff --git a/minix/man/man5/Makefile b/minix/man/man5/Makefile index 8c34332c3..a01f107c3 100644 --- a/minix/man/man5/Makefile +++ b/minix/man/man5/Makefile @@ -1,6 +1,6 @@ MAN= boot.cfg.5 configfile.5 crontab.5 ethers.5 \ - fstab.5 hosts.5 keymap.5 \ - passwd.5 resolv.conf.5 resolver.5 rhosts.5 statvfs.5 serv.access.5 \ + fstab.5 keymap.5 \ + passwd.5 rhosts.5 statvfs.5 serv.access.5 \ termcap.5 ttytab.5 TZ.5 utmp.5 \ pkg_install.conf.5 pkg_summary.5 diff --git a/minix/man/man5/hosts.5 b/minix/man/man5/hosts.5 deleted file mode 100644 index 621be2c33..000000000 --- a/minix/man/man5/hosts.5 +++ /dev/null @@ -1,57 +0,0 @@ -.TH HOSTS 5 -.SH NAME -hosts \- hostname to IP address database -.SH SYNOPSIS -.B /etc/hosts -.SH DESCRIPTION -The hosts database lists the IP addresses and the hostnames that translate -to these IP addresses. It is used by -.BR nonamed (8) -in a network without name servers. A simple -.B /etc/hosts -may look like this: -.PP -.RS -.ta +15n -.nf -10.0.0.1 flotsam -10.0.0.2 jetsam -.fi -.RE -.PP -These two entries give names to two IP addresses. The file may contain -comments marked with '#'. -.PP -You can have aliases (more hostnames on the same line) to give a machine -more than one name, like -.BR www , -if you run a web server on one. -.PP -If your PC is Internet connected then you can specify the name server(s) -to get more information from with %nameserver entries: -.PP -.RS -.ta +\w'172.16.24.3'u+4m +\w'%nameserver'u+4m -.nf -172.16.24.3 %nameserver # dns1.example.com -172.16.24.6 %nameserver # dns2.example.com -.fi -.RE -.PP -Read -.BR nonamed (8) -for all the details on special host file entries that configure -.B nonamed -for use on the Internet, and on home machines that are occasionally -connected to the Internet. -.SH FILES -.TP 15n -/etc/hosts -Hosts database. -.SH "SEE ALSO" -.BR ethers (5), -.BR nonamed (8), -.BR dhcpd (8), -.BR boot (8). -.SH AUTHOR -Kees J. Bot (kjb@cs.vu.nl) diff --git a/minix/man/man5/resolv.conf.5 b/minix/man/man5/resolv.conf.5 deleted file mode 100644 index eb6c4d280..000000000 --- a/minix/man/man5/resolv.conf.5 +++ /dev/null @@ -1,48 +0,0 @@ -.TH RESOLV.CONF 5 -.SH NAME -resolv.conf \- Domain Name System resolver configuration -.SH SYNOPSIS -.B /etc/resolv.conf -.SH DESCRIPTION -.de SP -.if t .sp 0.4 -.if n .sp -.. -The -.B /etc/resolv.conf -is used to configure how the host will use the Domain Name System to resolve -hostnames to IP addresses. It may contain these two lines: -.PP -.RS -.ta +15n -nameserver \fIIP-address\fP -.br -domain \fIdomain-name\fP -.RE -.PP -The nameserver entry tells the IP address of the host to use for DNS -queries. If it is set to 127.0.0.1 (which is the default) then the local -name daemon is used that may use the -.B /etc/hosts -database to translate host names. You normally only need a nameserver entry -if the name server is at the other side of a router. The default -.B nonamed -name server can't look beyond the local network. -.PP -The domain entry tells the default domain to use for unqualified hostnames. -This entry is usually not given in which case the domain of the local host -is used. -.PP -The long version of this story can be found in -.BR resolver (5). -.SH FILES -.TP 20n -/etc/resolv.conf -DNS resolver configuration file. -.SH "SEE ALSO" -.BR resolver (5), -.BR hosts (5), -.BR nonamed (8), -.BR boot (8). -.SH AUTHOR -Kees J. Bot (kjb@cs.vu.nl) diff --git a/minix/man/man5/resolver.5 b/minix/man/man5/resolver.5 deleted file mode 100644 index 4a48caf3a..000000000 --- a/minix/man/man5/resolver.5 +++ /dev/null @@ -1,98 +0,0 @@ -.\" Copyright (c) 1986 The Regents of the University of California. -.\" All rights reserved. -.\" -.\" Redistribution and use in source and binary forms are permitted -.\" provided that the above copyright notice and this paragraph are -.\" duplicated in all such forms and that any documentation, -.\" advertising materials, and other materials related to such -.\" distribution and use acknowledge that the software was developed -.\" by the University of California, Berkeley. The name of the -.\" University may not be used to endorse or promote products derived -.\" from this software without specific prior written permission. -.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR -.\" IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED -.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. -.\" -.\" @(#)resolver.5 5.9 (Berkeley) 12/14/89 -.\" -.TH RESOLVER 5 "December 14, 1989" -.UC 4 -.SH NAME -resolver \- resolver configuration file -.SH SYNOPSIS -/etc/resolv.conf -.SH DESCRIPTION -.LP -The -.I resolver -is a set of routines in the C library (\c -.IR resolv (3)) -that provide access to the Internet Domain Name System. -The resolver configuration file contains information that is read -by the resolver routines the first time they are invoked by a process. -The file is designed to be human readable and contains a list of -keywords with values that provide various types of resolver information. -.LP -On a normally configured system this file should not be necessary. -The only name server to be queried will be on the local machine, -the domain name is determined from the host name, -and the domain search path is constructed from the domain name. -.LP -The different configuration options are: -.TP -\fBnameserver\fP -Internet address (in dot notation) of a name server -that the resolver should query. -Up to MAXNS (currently 3) name servers may be listed, -one per keyword. -If there are multiple servers, -the resolver library queries them in the order listed. -If no \fBnameserver\fP entries are present, -the default is to use the name server on the local machine. -(The algorithm used is to try a name server, and if the query times out, -try the next, until out of name servers, -then repeat trying all the name servers -until a maximum number of retries are made). -.TP -\fBdomain\fP -Local domain name. -Most queries for names within this domain can use short names -relative to the local domain. -If no \fBdomain\fP entry is present, the domain is determined -from the local host name returned by -\fIgethostname\fP\|(2); -the domain part is taken to be everything after the first `.'. -Finally, if the host name does not contain a domain part, the root -domain is assumed. -.TP -\fBsearch\fP -Search list for host-name lookup. -The search list is normally determined from the local domain name; -by default, it begins with the local domain name, then successive -parent domains that have at least two components in their names. -This may be changed by listing the desired domain search path -following the \fIsearch\fP keyword with spaces or tabs separating -the names. -Most resolver queries will be attempted using each component -of the search path in turn until a match is found. -Note that this process may be slow and will generate a lot of network -traffic if the servers for the listed domains are not local, -and that queries will time out if no server is available -for one of the domains. -.IP -The search list is currently limited to six domains -with a total of 256 characters. -.LP -The \fIdomain\fP and \fIsearch\fP keywords are mutually exclusive. -If more than one instance of these keywords is present, -the last instance will override. -.LP -The keyword and value must appear on a single line, and the keyword -(e.g. \fBnameserver\fP) must start the line. The value follows -the keyword, separated by white space. -.SH FILES -.I /etc/resolv.conf -.SH SEE ALSO -gethostbyname(3N), resolver(3), hostname(7), named(8) -.br -Name Server Operations Guide for BIND diff --git a/minix/man/man7/hier.7 b/minix/man/man7/hier.7 index 50902ab49..e2582b960 100644 --- a/minix/man/man7/hier.7 +++ b/minix/man/man7/hier.7 @@ -53,8 +53,6 @@ System configuration and data files; see also \fB/usr/etc/\fP. \fBpasswd\fP user database, \fBpasswd\fP(1) \fBprofile\fP system wide shell profile \fBrc\fP system startup script, \fBboot\fP(8) - \fBresolv.conf\fP - TCP/IP domain name system, \fBresolv.conf\fP(5) \fBservices\fP TCP/IP names to services \fBserv.access\fP -- 2.44.0