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dqcache(8) System Manager's Manual dqcache(8) NAME dqcache - DNS cache with DNSCurve support DESCRIPTION dqcache is recursive DNS server derived from dnscache (https://cr.yp.to/djbdns/dnscache.html) CONFIGURATION dqcache runs chrooted in the directory specified by the $ROOT environment variable, under the uid and gid specified by the $UID and $GID environment variables. dqcache listens for incoming UDP packets and TCP connections addressed to port 53 of $IP. Typically $IP is 127.0.0.1, but it can also be an exter- nally accessible IP address. dqcache accepts connections from localhost (127.0.0.0/8 or ::1/128). For external connections dqcache has file-style accesslist. e.g. for IPv4 address 1.2.3.4 dqcache allows connection when sees a file named: ip4/1.2.3.4 or ip4/1.2.3 or ip4/1.2 or ip4/1 e.g. for IPv6 address 2a02:598:7000:101:12dd:b1ff:fede:3476 dqcache allows connection when sees a file named: ip6/2a02:598:7000:101:12dd:b1ff:fede:3476 or ip6/2a02:598:7000:101:12dd:b1ff:fede or ip6/2a02:598:7000:101:12dd:b1ff or ip6/2a02:598:7000:101:12dd or ip6/2a02:598:7000:101 or ip6/2a02:598:7000 or ip6/2a02:598 or ip6/2a02 when environment variable $OKCLIENT is set, dqcache accepts all connec- tions. Warning , dqcache encrypts DNS packets and should run on client's machine. If You run dqcache on external IP (not on localhost), You're probably doing it wrong. dqcache sends outgoing IPv4 packets from high ports of $IPSEND4. Typically $IPSEND4 is 0.0.0.0, meaning the machine's primary IPv4 address. dqcache sends outgoing IPv6 packets from high ports of $IPSEND6. Typically $IPSEND6 is ::, meaning the machine's primary IPv6 address. If $HIDETTL is set, dqcache always uses a TTL of 0 in its responses dqcache reads a list of root servers as an anchor, one record per line, from servers/@. The record has format {IP} or {IP}|{DNSCURVEPUBLICKEY} e.g.: servers/@: 198.41.0.4 2001:503:ba3e::2:30 192.228.79.201 2001:500:84::b etc. dqcache also scans the servers directory for anchors for other domains, one record per line. The record has format {IP} or {IP}|{DNSCURVEPUBLICKEY} e.g.: servers/dnscurve.cz: 185.66.36.55|uz5mj60yr9tnudkkpcglw1y0w6dlh78j1l4gk4z7t8bsf1u4d48wlq 37.157.196.86|uz5mj60yr9tnudkkpcglw1y0w6dlh78j1l4gk4z7t8bsf1u4d48wlq 2a02:2b88:2:1::127d:1|uz5mj60yr9tnudkkpcglw1y0w6dlh78j1l4gk4z7t8bsf1u4d48wlq 2a03:1e20:0:5::2|uz5mj60yr9tnudkkpcglw1y0w6dlh78j1l4gk4z7t8bsf1u4d48wlq dqcache supports forward-only mode. If $FORWARDONLY is set, dqcache treats servers/@ as a list of IP addresses for other caches, not root servers. It forwards queries to those caches the same way that a client does, rather than contacting a chain of servers according to NS records. dqcache uses a fixed-size cache, as controlled by the $CACHESIZE environ- ment variable. Typically $CACHESIZE is 10000000 (10MB). dqcache typically generates new secret key at start of program. If environ- ment variable $SECRETKEY is set, then dqcache loads this secret key. $SE- CRETKEY must be safely generated using dqcache-makekey(8). Note that dqcache uses internally two secret keys, one used as the discrete logarithm of the public key (256bit DNSCurve key) and one to encrypt the nonce (128bit TEA symmetric key). Both of these keys are actually derived from $SECRETKEY using crypto_stream_salsa20(). dqcache also supports nonce-separation via environment variable $NONCES- TART. This means that several caches share a key but use separate nonces: e.g.: NONCESTART=100 ... the first of four caches is configured to use top bits 100 NONCESTART=101 ... the second is configured to use top bits 101 NONCESTART=110 ... the third is configured to use top bits 110 NONCESTART=111 ... and the fourth is configured to use top bits 111. etc. dqcache typically supports DNSCurve in 'combined mode' (meaning: if Stream- lined query fails, dqcache tries also TXT query). Environment variable $DNSCURVETYPE selects specific DNSCurve type. DNSCURVETYPE=1 ... Streamlined only DNSCurve DNSCURVETYPE=2 ... TXT only DNSCurve dqcache caches records for at least $MINTTL seconds, when MINTTL is set. It's limited <0-300> seconds. Use only if you really know what you're do- ing. dqcache sends only IPv4 queries, when DISABLEIPV6 is set. Use only if you really know what you're doing. SEE ALSO dqcache-makekey(8), dq(1), dnscache(8) https://mojzis.com/software/dq https://dnscurve.org/ https://cr.yp.to/djbdns/dnscache.html dqcache(8)
NAME | DESCRIPTION | CONFIGURATION | SEE ALSO
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