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777 discussions

by Jan Včelák

Hello list! The first release candidate of Knot DNS 2.0 by CZ.NIC Labs is available. The most significant changes since 2.0.0-beta are related to the server configuration. We have renamed a few configuration options for the sake of consistency and intuitiveness. And we have significantly improved the way how remotes and ACLs are defined. In prior version, each remote was assigned just one address, which led to quite long configuration files. The updated version allows specification of multiple addresses (and multiple TSIG keys), making the configuration file shorter and more readable. We have also added a basic support for zone file name patterns. At the moment, you can use the '%s' pattern in the template/file configuration option and the pattern will be substituted by a zone name. We would like to add another patterns in future. Feel free to let us know which patterns you would find useful. The 2.0.0-rc1 version also contains all bug fixes and improvements, which are included in the upcoming 1.6.4 stable release. And the icing on the cake is Bash and ZSH completion scripts for keymgr. Please, give the release candidate a try. We are looking forward to your feedback and bug reports. And as always, thank you for using Knot DNS. Full changelog: https://gitlab.labs.nic.cz/labs/knot/raw/v2.0.0-rc1/NEWS Sources: https://secure.nic.cz/files/knot-dns/knot-2.0.0-rc1.tar.xz GPG signature: https://secure.nic.cz/files/knot-dns/knot-2.0.0-rc1.tar.xz.asc Best Regards, Jan -- Jan Včelák, Knot DNS CZ.NIC Labs https://www.knot-dns.cz -------------------------------------------- Milešovská 5, 130 00 Praha 3, Czech Republic WWW: https://labs.nic.cz https://www.nic.cz

11 let, 3 měsíce

[PATCH] kdig: Record the dnstap SocketProtocol correctly when retrying over TCP

by Robert Edmonds

Previously, kdig's write_dnstap() function passed net->srv->ai_protocol as dt_message_fill()'s 'protocol' parameter, but net->srv->ai_protocol is not actually guaranteed to be the socket protocol used for the query/response. When kdig's process_query_packet() retries over TCP, it only sets net->socktype to SOCK_STREAM in an already initialized net_t and calls itself. The addrinfo's in the net_t aren't updated, so they have the original values from the first invocation of process_query_packet(), i.e., the lookup that occurred over UDP. However, net->socktype is actually what controls whether TCP or UDP is ultimately used in net_connect(). Instead of passing net->srv->ai_protocol to dt_message_fill(), map net->socktype to an IPPROTO_* value. (Which is what kdig does elsewhere via get_sockname(), which is why the formatted output written to stdout at the same time, e.g. "127.0.0.1@53(TCP)" doesn't have a similiar bug.) --- src/utils/kdig/kdig_exec.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/src/utils/kdig/kdig_exec.c b/src/utils/kdig/kdig_exec.c index b91a958..1f6a64d 100644 --- a/src/utils/kdig/kdig_exec.c +++ b/src/utils/kdig/kdig_exec.c @@ -44,6 +44,7 @@ static int write_dnstap(dt_writer_t *writer, Dnstap__Message msg; Dnstap__Message__Type msg_type; int ret; + int protocol = 0; if (writer == NULL) { return KNOT_EOK; @@ -54,8 +55,14 @@ static int write_dnstap(dt_writer_t *writer, msg_type = is_response ? DNSTAP__MESSAGE__TYPE__TOOL_RESPONSE : DNSTAP__MESSAGE__TYPE__TOOL_QUERY; + if (net->socktype == SOCK_DGRAM) { + protocol = IPPROTO_UDP; + } else if (net->socktype == SOCK_STREAM) { + protocol = IPPROTO_TCP; + } + ret = dt_message_fill(&msg, msg_type, net->local_info->ai_addr, - net->srv->ai_addr, net->srv->ai_protocol, + net->srv->ai_addr, protocol, wire, wire_len, qtime, rtime); if (ret != KNOT_EOK) { return ret; -- 2.1.4

11 let, 4 měsíce

Updating slaves

by Amar Cosic

Hello list, anyone can point me to documentation or manual what is right way to update slaves. What I want to is when I change record X on master that slaves also pick that change without me manualy have to do this. My configuration is OK as on initial zone transfers slaves got data/zones OK. I tried knotc reload knotc flush knotc refresh and restarting knotc service. On all this there was nothing in syslog and slaves are not updating ty. -- Amar Ćosić amar.cosic(a)gmail.com amar(a)amar.ba

11 let, 4 měsíce

Knot DNS 1.6.3 patch release

by Jan Včelák

Hello list, CZ.NIC Labs just released Knot DNS 1.6.3. This patch release contains a few rather serious bug fixes and some minor improvements. Update is highly recommended. When performing our internal benchmarking, we discovered a serious performance drop for large NSEC-signed zones (not NSEC3). In construction of NSEC proofs for NXDOMAIN responses, the server got into a loop possibly causing iteration over all domain names in the zone. The problem was present in Knot DNS since the beginning of the project. We are sorry for not noticing this earlier. The new version also handles TCP short-writes properly. Prior to this fix, sending a response over TCP could fail if the socket send buffer was small (e.g., in default configuration on FreeBSD). In addition, if the buffers are too small, we increase their size on server initialization to make fast-path processing more likely. We also fixed possible out-of-bound memory accesses revealed by American Fuzzy Lop fuzzer. One such an access was in the zone parser (long domain names in zone origin) and two in the packet parser (TSIG with empty RDATA and malformed NAPTR). As for the improvements: The zone parser now supports CDS and CDNSKEY RR types, the documentation now includes default values for TCP config options, and more detailed message is emitted when a zone reload fails. Full changelog: https://gitlab.labs.nic.cz/labs/knot/blob/v1.6.3/NEWS Sources: https://secure.nic.cz/files/knot-dns/knot-1.6.3.tar.xz https://secure.nic.cz/files/knot-dns/knot-1.6.3.tar.gz GPG signatures: https://secure.nic.cz/files/knot-dns/knot-1.6.3.tar.xz.asc https://secure.nic.cz/files/knot-dns/knot-1.6.3.tar.gz.asc Best Regards, Jan -- Jan Včelák, Knot DNS CZ.NIC Labs https://www.knot-dns.cz -------------------------------------------- Milešovská 5, 130 00 Praha 3, Czech Republic WWW: https://labs.nic.cz https://www.nic.cz

11 let, 5 měsíců

Knot DNS 2.0.0-beta release

by Jan Včelák

Hello everyone! Today, CZ.NIC Labs releases Knot DNS 2.0.0-beta. We finally managed to complete, stabilize, and document all new features of the upcoming Knot DNS version. We are aware of some glitches in this release, however we think that it is ready to be tested by a wider audience. There are two key features of Knot DNS 2.0: # New DNSSEC implementation I wrote quite a lot about the new DNSSEC in the 1.99.1 release announcement. Since then, only a few things changed. There was a bug in the ZSK rotation algorithm. The old DNSKEY was removed too soon possibly breaking the validation. This problem is resolved now. The keymgr utility has a new manual page. And the documentation was updated to reflect all changes. # New configuration format This change is quite significant for the future development of Knot DNS. And it will affect everyone using the software. We decided to switch from a custom configuration format to YAML. Internally, the configuration is stored in a binary database (LMDB). At the moment, you won't probably notice anything about the database. However we are working on a new interface, which will allow making changes into the configuration without a full server reload. If you have Knot DNS with thousands of zones, you will benefit this for sure. We don't support full YAML specification, but there is a certain level of compatibility. We plan to extend the support so you can generate the config from your favorite scripting language. Some configuration options (and configuration sections) were renamed. We changed the concept how the incoming and outgoing connections are configured. We split 'remotes' to 'remote' and 'acl'. 'remote' defines target for outgoing connection (zone transfer source, notification target). And 'acl' defines rules for accepting connections initiated by a remote client (outgoing transfer, incoming notification, and incoming update). At the moment, only one address can be specified for each 'remote' or 'acl'. In addition, we removed 'groups' as it was complicating the implementation. We are aware that the current state is not ideal. And we are looking for feedback and suggestions from the community. We are not just removing and changing things - we added support for zone templates, which is something a lot of our users asked for. A template allows you to configure options shared among multiple zones. A change in the template affects all zones, which use the template. To convert the configuration from the 1.6 to the 2.0 format, the knot1to2 tool is provided. The tool doesn't support conversion for answering modules (e.g. synth_record), but should handle anything else. Please, review the configuration after performing the automatic conversion. That's all, folks! Please, give it a try. Experiment with the new DNSSEC and play around with the new configuration. And most importantly, let us know what do you think. Thank you for using Knot DNS! Sources: https://secure.nic.cz/files/knot-dns/knot-2.0.0-beta.tar.xz https://secure.nic.cz/files/knot-dns/knot-2.0.0-beta.tar.gz GPG signatures: https://secure.nic.cz/files/knot-dns/knot-2.0.0-beta.tar.xz.asc https://secure.nic.cz/files/knot-dns/knot-2.0.0-beta.tar.gz.asc Best Regards, Jan -- Jan Včelák, Knot DNS CZ.NIC Labs https://www.knot-dns.cz -------------------------------------------- Milešovská 5, 130 00 Praha 3, Czech Republic WWW: https://labs.nic.cz https://www.nic.cz

11 let, 5 měsíců

Work-around for Knot's configuration syntax

by Anand Buddhdev

I'm generating my Knot's config from a Jinja2 template, and I'm having a problem with one thing. For example, if I have a list of elements, [e1,e2,e3,e4], and I want to generate a "groups" config for these based on a condition, and I do: groups { mygroup { {% for x in list %} {% if condition %} {{ x }}, {% endif %} {% endfor %} } However, this results in a syntax error, because the last element ends with a comma, and then there's a closing bracket. I tried to insert the comma conditionally, by checking to see if it was the last element, but this can also fail if the last element didn't match the condition. So I thought about this ugly hack: groups { mygroup { {% for x in list %} {% if condition %} ,{{ x }} {% endif %} {% endfor %} } Notice that I have the comma *before* each element. This results in an opening brace, a comma, and then the other elements. My supposition is that Knot's syntax parser is okay with this, because it just sees a null first element. If I check this with knotc's "checkconf", it says the syntax is okay. Can I safely use such a config? Regards, Anand

11 let, 5 měsíců

Use of recvmmsg in Knot

by Anand Buddhdev

Dear Knot developers, In Knot 1.6.3, is it safe to leave out the "interfaces" section of the config on a multi-homed server? Will Knot enumerate all the addresses on the host and bind to them, or will it bind to 0.0.0.0 and ::? Secondly, if bound to 0.0.0.0 and ::, will Knot use recvmmsg correctly and set the source address in UDP reply packets to the address the query was sent to? Regards, Anand

11 let, 5 měsíců

key file format for nsupdate

by Andrew Stevenson

Hi, I am trying to use nsupdate from knot 1.6.1. I have generated key files using dnssec-keygen from BIND 9.9.5. i.e. dnssec-keygen -a HMAC-MD5 -b 256 -n HOST -C host.example.com Whenever I try to use the files with nsupdate -k <file> though I get: ; Error: failed to read key file: public key file is invalid I have also tried without the “-C” to dnssec-keygen. Are there different flags I need? Or does someone have an example of the file format required? Thanks, Andrew

11 let, 6 měsíců

Short write?

by Linus Nordberg

Hi, I'm looking at knot-1.6.1 after have experienced failure with sending AXFR after a zone grew due to enabling DNSSEC, adding a lot of records. I don't know much about iovecs, but isn't this a short write? --8<---------------cut here---------------start------------->8--- libknot/internal/errcode.h: enum knot_error { ... KNOT_ECONNREFUSED = -ECONNREFUSED, ... KNOT_ERROR_MIN = -1000, ... KNOT_ERROR = KNOT_ERROR_MIN, ... KNOT_ECONN, ... }; libknot/internal/net.c: int tcp_send_msg(int fd, const uint8_t *msg, size_t msglen) { ... int total_len = iov[0].iov_len + iov[1].iov_len; int sent = writev(fd, iov, 2); if (sent != total_len) { return KNOT_ECONN; } ... } knot/server/tcp-handler.c: tcp_handle() { ... while (state & (NS_PROC_FULL|NS_PROC_FAIL)) { uint16_t tx_len = tx->iov_len; state = knot_process_out(tx->iov_base, &tx_len, &tcp->query_ctx); /* If it has response, send it. */ if (tx_len > 0) { if (tcp_send_msg(fd, tx->iov_base, tx_len) != tx_len) { ret = KNOT_ECONNREFUSED; break; } } } ... } --8<---------------cut here---------------end--------------->8--- Happy to file a bug report if that's a more proper way of reporting bugs.

11 let, 6 měsíců

[PATCH] Add "forced generic" dump style, and kdig +generic option

by Robert Edmonds

This patch adds a new "forced generic" dump style which dumps resource record types and data in the generic RFC 3597 representation format, even for known resource record types. A corresponding +generic option to kdig enables this dump style. Generic representation format is very handy when dealing with older DNS software that may not support a new resource record type, or with systems where it is more convenient to use the generic format even with known types. It is also a nice debugging / educational feature. (No need to fire up Wireshark.) --- man/kdig.1.in | 3 +++ src/libknot/rrset-dump.c | 10 +++++++++- src/libknot/rrset-dump.h | 2 ++ src/utils/kdig/kdig_params.c | 13 +++++++++++++ 4 files changed, 27 insertions(+), 1 deletion(-) diff --git a/man/kdig.1.in b/man/kdig.1.in index 4772e27..b6f2286 100644 --- a/man/kdig.1.in +++ b/man/kdig.1.in @@ -178,6 +178,9 @@ Use EDNS version (default is 0). Disable IDN transformation to ASCII and vice versa. IDNA2003 support depends on libidn availability during project building! .TP +.BR +generic +Use the generic representation format when printing resource record types and data. +.TP .BI +client= SUBN Set EDNS client subnet SUBN=IP/prefix. .TP diff --git a/src/libknot/rrset-dump.c b/src/libknot/rrset-dump.c index dd4625d..2f503c1 100644 --- a/src/libknot/rrset-dump.c +++ b/src/libknot/rrset-dump.c @@ -1774,6 +1774,10 @@ int knot_rrset_txt_dump_data(const knot_rrset_t *rrset, return ret; } + if (style->generic) { + return dump_unknown(&p); + } + switch (rrset->type) { case KNOT_RRTYPE_A: ret = dump_a(&p); @@ -1941,7 +1945,11 @@ int knot_rrset_txt_dump_header(const knot_rrset_t *rrset, } // Dump rrset type. - if (knot_rrtype_to_string(rrset->type, buf, sizeof(buf)) < 0) { + if (style->generic) { + if (snprintf(buf, sizeof(buf), "TYPE%u", rrset->type) < 0) { + return KNOT_ESPACE; + } + } else if (knot_rrtype_to_string(rrset->type, buf, sizeof(buf)) < 0) { return KNOT_ESPACE; } if (rrset->rrs.rr_count > 0) { diff --git a/src/libknot/rrset-dump.h b/src/libknot/rrset-dump.h index 4519159..e44cca3 100644 --- a/src/libknot/rrset-dump.h +++ b/src/libknot/rrset-dump.h @@ -46,6 +46,8 @@ typedef struct { bool human_ttl; /*!< Format timestamp as YYYYMMDDHHmmSS. */ bool human_tmstamp; + /*!< Force generic data representation. */ + bool generic; /*!< ASCII string to IDN string transformation callback. */ void (*ascii_to_idn)(char **name); } knot_dump_style_t; diff --git a/src/utils/kdig/kdig_params.c b/src/utils/kdig/kdig_params.c index ec7ec9f..6fafb22 100644 --- a/src/utils/kdig/kdig_params.c +++ b/src/utils/kdig/kdig_params.c @@ -54,6 +54,7 @@ static const style_t DEFAULT_STYLE_DIG = { .empty_ttl = false, .human_ttl = false, .human_tmstamp = true, + .generic = false, .ascii_to_idn = name_to_idn }, .show_query = false, @@ -551,6 +552,15 @@ static int opt_noidn(const char *arg, void *query) return KNOT_EOK; } +static int opt_generic(const char *arg, void *query) +{ + query_t *q = query; + + q->style.style.generic = true; + + return KNOT_EOK; +} + static int opt_nsid(const char *arg, void *query) { query_t *q = query; @@ -805,6 +815,8 @@ static const param_t kdig_opts2[] = { /* "idn" doesn't work since it must be called before query creation. */ { "noidn", ARG_NONE, opt_noidn }, + { "generic", ARG_NONE, opt_generic }, + { "client", ARG_REQUIRED, opt_client }, { "time", ARG_REQUIRED, opt_time }, @@ -1363,6 +1375,7 @@ static void kdig_help(void) " +[no]nsid Request NSID.\n" " +[no]edns=N Use EDNS (=version).\n" " +noidn Disable IDN transformation.\n" + " +generic Use generic representation format.\n" " +client=SUBN Set EDNS client subnet IP/prefix.\n" " +time=T Set wait for reply interval in seconds.\n" " +retry=N Set number of retries.\n" -- 2.1.4

11 let, 6 měsíců

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