The /usr/libexec/unbound
resolver shipped with macOS 10.13.5 doesn't seem to work with UDPv6 properly. I tried to reproduce a setup from this guide and encountered an issue: unbound won't respond to DNS queries arriving to IPv6 UDP *:53 (while IPv6 TCP *:53 works fine). I downloaded and compiled the latest published version of unbound and it works well.
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June 13, 2018 11:58
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macOS 10.13.5 unbound issue
/usr/libexec/unbound -h
usage: unbound [options]
start unbound daemon DNS resolver.
-h this help
-c file config file to read instead of /usr/local/etc/unbound/unbound.conf
file format is described in unbound.conf(5).
-d do not fork into the background.
-v verbose (more times to increase verbosity)
Version 1.5.1
linked libs: mini-event internal (it uses select), LibreSSL 2.2.7
linked modules: dns64 validator iterator
BSD licensed, see LICENSE in source package for details.
Report bugs to unbound-bugs@nlnetlabs.nl
shasum /usr/libexec/unbound
7993140c01188663a23b64cbca95e0f6d1f2f800 /usr/libexec/unbound
cat /etc/com.apple.mis.unbound.conf
server:
chroot: ""
pidfile: "/etc/unbound.pid"
chroot: ""
directory: "/etc"
username: ""
do-daemonize: no
access-control: ::0/0 allow
module-config: "dns64 iterator"
dns64-synthall: yes
dns64-prefix: 2001:2:0:1baa::/96
interface: ::0
forward-zone:
name: "."
forward-addr: 8.8.8.8
sudo dtruss -f sudo /usr/libexec/unbound -c /etc/com.apple.mis.unbound.conf -d -vvvvv
10787/0x195e5: open("/dev/dtracehelper\0", 0x2, 0x181D592F) = 3 0
10787/0x195e5: ioctl(0x3, 0x80086804, 0x7FFEE218AD78) = 0 0
10787/0x195e5: close(0x3) = 0 0
10787/0x195e5: access("/AppleInternal/XBS/.isChrooted\0", 0x0, 0x0) = -1 Err#2
10787/0x195e5: thread_selfid(0x0, 0x0, 0x0) = 103909 0
10787/0x195e5: bsdthread_register(0x7FFF53CF8BEC, 0x7FFF53CF8BDC, 0x2000) = 1073742047 0
10787/0x195e5: mprotect(0x10DB03000, 0x1000, 0x0) = 0 0
10787/0x195e5: mprotect(0x10DB0A000, 0x1000, 0x0) = 0 0
10787/0x195e5: mprotect(0x10DB0B000, 0x1000, 0x0) = 0 0
10787/0x195e5: mprotect(0x10DB12000, 0x1000, 0x0) = 0 0
10787/0x195e5: mprotect(0x10DB01000, 0x88, 0x1) = 0 0
10787/0x195e5: mprotect(0x10DB13000, 0x1000, 0x1) = 0 0
10787/0x195e5: mprotect(0x10DB01000, 0x88, 0x3) = 0 0
10787/0x195e5: mprotect(0x10DB01000, 0x88, 0x1) = 0 0
10787/0x195e5: issetugid(0x0, 0x0, 0x0) = 0 0
10787/0x195e5: getpid(0x0, 0x0, 0x0) = 10787 0
10787/0x195e5: stat64("/AppleInternal/XBS/.isChrooted\0", 0x7FFEE218B048, 0x0) = -1 Err#2
10787/0x195e5: stat64("/AppleInternal\0", 0x7FFEE218B0E0, 0x0) = -1 Err#2
10787/0x195e5: csops(0x2A23, 0x7, 0x7FFEE218AB80) = 0 0
10787/0x195e5: sysctl([CTL_KERN, 14, 1, 10787, 0, 0] (4), 0x7FFEE218ACC8, 0x7FFEE218ACC0, 0x0, 0x0) = 0 0
10787/0x195e5: csops(0x2A23, 0x7, 0x7FFEE218A470) = 0 0
10787/0x195e5: sigaction(0xF, 0x7FFEE218C828, 0x7FFEE218C850) = 0 0
10787/0x195e5: sigaction(0x3, 0x7FFEE218C828, 0x7FFEE218C850) = 0 0
10787/0x195e5: sigaction(0x1, 0x7FFEE218C828, 0x7FFEE218C850) = 0 0
10787/0x195e5: sigaction(0xD, 0x7FFEE218C828, 0x7FFEE218C850) = 0 0
10787/0x195e5: sigaction(0x2, 0x7FFEE218C828, 0x7FFEE218C850) = 0 0
10787/0x195e5: getrlimit(0x1008, 0x7FFEE218C5F0, 0x0) = 0 0
10787/0x195e5: open_nocancel("/private/etc/ssl/openssl.cnf\0", 0x0, 0x1B6) = 3 0
10787/0x195e5: fstat64(0x3, 0x7FFEE218C4B8, 0x0) = 0 0
10787/0x195e5: read_nocancel(0x3, "[ req ]\n#default_bits\t\t= 2048\n#default_md\t\t= sha256\n#default_keyfile \t= privkey.pem\ndistinguished_name\t= req_distinguished_name\nattributes\t\t= req_attributes\n\n[ req_distinguished_name ]\ncountryName\t\t\t= Country Name (2 letter code)\ncountryName_min\t\t\t= 2\ncoun", 0x10000) = 745 0
10787/0x195e5: read_nocancel(0x3, "\0", 0x10000) = 0 0
10787/0x195e5: close_nocancel(0x3) = 0 0
10787/0x195e5: access("/etc/localtime\0", 0x4, 0x0) = 0 0
10787/0x195e5: open_nocancel("/etc/localtime\0", 0x0, 0x0) = 3 0
10787/0x195e5: fstat64(0x3, 0x7FFEE218C358, 0x0) = 0 0
10787/0x195e5: read_nocancel(0x3, "TZif2\0", 0xA1E8) = 1931 0
10787/0x195e5: close_nocancel(0x3) = 0 0
10787/0x195e5: issetugid(0x0, 0x0, 0x0) = 0 0
10787/0x195e5: open_nocancel("/var/db/timezone/zoneinfo/posixrules\0", 0x0, 0x0) = 3 0
10787/0x195e5: fstat64(0x3, 0x7FFEE218C1A8, 0x0) = 0 0
10787/0x195e5: read_nocancel(0x3, "TZif2\0", 0xA1E8) = 3519 0
10787/0x195e5: close_nocancel(0x3) = 0 0
10787/0x195e5: shm_open(0x7FFF53CEDDEF, 0x0, 0x0) = 3 0
10787/0x195e5: mmap(0x0, 0x1000, 0x1, 0x1, 0x3, 0x0) = 0x10DF14000 0
10787/0x195e5: close_nocancel(0x3) = 0 0
10787/0x195e5: write_nocancel(0x2, "[1528890899] unbound[10787:0] notice: Start of unbound 1.5.1.\n\340\0", 0x3E) = 62 0
10787/0x195e5: open_nocancel("/etc/com.apple.mis.unbound.conf\0", 0x0, 0x1B6) = 3 0
10787/0x195e5: ioctl(0x3, 0x4004667A, 0x7FFEE218BEA4) = -1 Err#25
10787/0x195e5: ioctl(0x3, 0x40487413, 0x7FFEE218BEA8) = -1 Err#25
10787/0x195e5: fstat64(0x3, 0x7FFEE218BDA8, 0x0) = 0 0
10787/0x195e5: read_nocancel(0x3, "server:\n\tchroot: \"\"\n\tpidfile: \"/etc/unbound.pid\"\n\tchroot: \"\"\n\tdirectory: \"/etc\"\n\tusername: \"\"\n\tdo-daemonize: no\n\taccess-control: ::0/0 allow\n\tmodule-config: \"dns64 iterator\"\n\tdns64-synthall: yes\n\tdns64-prefix: 2001:2:0:1baa::/96\n\tinterface: ::0\nforward-zon", 0x10000) = 293 0
10787/0x195e5: read_nocancel(0x3, "\0", 0x10000) = 0 0
10787/0x195e5: ioctl(0x3, 0x4004667A, 0x7FFEE218BEB4) = -1 Err#25
10787/0x195e5: ioctl(0x3, 0x40487413, 0x7FFEE218BEB8) = -1 Err#25
10787/0x195e5: close_nocancel(0x3) = 0 0
10787/0x195e5: getrlimit(0x1008, 0x7FFEE218C910, 0x0) = 0 0
10787/0x195e5: open_nocancel("/etc/.mdns_debug\0", 0x0, 0x0) = 3 0
10787/0x195e5: read_nocancel(0x3, "OEA\n\0", 0x4) = 4 0
10787/0x195e5: write_nocancel(0x2, "[1528890899] unbound[10787:0] debug: creating udp6 socket :: 53\n\0", 0x40) = 64 0
10787/0x195e5: socket(0x1E, 0x2, 0x0) = 4 0
10787/0x195e5: setsockopt(0x4, 0xFFFF, 0x4) = 0 0
10787/0x195e5: setsockopt(0x4, 0x29, 0x1B) = 0 0
10787/0x195e5: setsockopt(0x4, 0x29, 0x2A) = 0 0
10787/0x195e5: bind(0x4, 0x7FC825D05BF0, 0x1C) = 0 0
10787/0x195e5: fcntl(0x4, 0x3, 0x0) = 2 0
10787/0x195e5: fcntl(0x4, 0x4, 0x6) = 0 0
10787/0x195e5: write_nocancel(0x2, "[1528890899] unbound[10787:0] debug: creating tcp6 socket :: 53\n\0", 0x40) = 64 0
10787/0x195e5: socket(0x1E, 0x1, 0x0) = 5 0
10787/0x195e5: setsockopt(0x5, 0xFFFF, 0x4) = 0 0
10787/0x195e5: setsockopt(0x5, 0x29, 0x1B) = 0 0
10787/0x195e5: bind(0x5, 0x7FC825D05C10, 0x1C) = 0 0
10787/0x195e5: fcntl(0x5, 0x3, 0x0) = 2 0
10787/0x195e5: fcntl(0x5, 0x4, 0x6) = 0 0
10787/0x195e5: listen(0x5, 0x100, 0x0) = 0 0
10787/0x195e5: write_nocancel(0x2, "[1528890899] unbound[10787:0] debug: switching log to syslog\n\0", 0x3D) = 61 0
10787/0x195e5: getuid(0x0, 0x0, 0x0) = 0 0
10787/0x195e5: getgid(0x0, 0x0, 0x0) = 0 0
10787/0x195e5: geteuid(0x0, 0x0, 0x0) = 0 0
10787/0x195e5: getentropy(0x7FFEE218C770, 0x28, 0x0) = 0 0
10787/0x195e5: mmap(0x0, 0x10, 0x3, 0x1002, 0xFFFFFFFFFFFFFFFF, 0x0) = 0x10DF56000 0
10787/0x195e5: mmap(0x0, 0x440, 0x3, 0x1002, 0xFFFFFFFFFFFFFFFF, 0x0) = 0x10DF57000 0
10787/0x195e5: open("/etc/unbound.pid\0", 0x0, 0x0) = 6 0
10787/0x195e5: read(0x6, "10760\n\0", 0x20) = 6 0
10787/0x195e5: close(0x6) = 0 0
10787/0x195e5: kill(10760, 0) = -1 Err#3
10787/0x195e5: proc_info(0x2, 0x2A23, 0x11) = 56 0
10787/0x195e5: proc_info(0x2, 0x2A23, 0x11) = 56 0
10787/0x195e5: sysctl([CTL_KERN, 14, 1, 10787, 0, 0] (4), 0x7FFEE2189A98, 0x7FFEE2189A88, 0x0, 0x0) = 0 0
10787/0x195e5: issetugid(0x0, 0x0, 0x0) = 0 0
10787/0x195e5: open("/usr/libexec/unbound\0", 0x8004, 0x53D3AB2E) = 6 0
10787/0x195e5: fcntl(0x6, 0x32, 0x7FFEE2188E20) = 0 0
10787/0x195e5: close(0x6) = 0 0
10787/0x195e5: ulock_wake(0x102, 0x10DF58280, 0x0) = -1 Err#2
10787/0x195e5: open_nocancel("/etc/unbound.pid\0", 0x601, 0x1B6) = 6 0
10787/0x195e5: fstat64(0x6, 0x7FFEE218C588, 0x0) = 0 0
10787/0x195e5: write_nocancel(0x6, "10787\n\0", 0x6) = 6 0
10787/0x195e5: close_nocancel(0x6) = 0 0
10787/0x195e5: chdir("/etc\0", 0x0, 0x0) = 0 0
10787/0x195e5: getentropy(0x7FFEE218C7E0, 0x20, 0x0) = 0 0
10787/0x195e5: socketpair(0x1, 0x1, 0x0) = 0 0
10787/0x195e5: fcntl(0x6, 0x3, 0x0) = 2 0
10787/0x195e5: fcntl(0x6, 0x4, 0x6) = 0 0
10787/0x195e5: fcntl(0x7, 0x3, 0x0) = 2 0
10787/0x195e5: fcntl(0x7, 0x4, 0x6) = 0 0
10787/0x195e5: madvise(0x10DF98000, 0x40000, 0x9) = 0 0
10787/0x195e5: __pthread_sigmask(0x2, 0x7FFEE218C80C, 0x0) = 0 0
10787/0x195e5: __pthread_sigmask(0x2, 0x7FFEE218C80C, 0x0) = 0 0
10787/0x195e5: __pthread_sigmask(0x2, 0x7FFEE218C80C, 0x0) = 0 0
10787/0x195e5: __pthread_sigmask(0x2, 0x7FFEE218C80C, 0x0) = 0 0
10787/0x195e5: sigaction(0x1, 0x7FFEE218C788, 0x7FFEE218C7B0) = 0 0
10787/0x195e5: sigaction(0x3, 0x7FFEE218C788, 0x7FFEE218C7B0) = 0 0
10787/0x195e5: sigaction(0xF, 0x7FFEE218C788, 0x7FFEE218C7B0) = 0 0
10787/0x195e5: sigaction(0x2, 0x7FFEE218C788, 0x7FFEE218C7B0) = 0 0
10787/0x195e5: ulock_wake(0x102, 0x10DF58380, 0x0) = -1 Err#2
...
echo "hello" | socat -v - UDP-DATAGRAM:\[2001:2:0:aab1::1\]:53
> 2018/06/13 13:57:17.623743 length=6 from=0 to=5
hello
...
echo "hello" | socat -v - TCP-CONNECT:\[2001:2:0:aab1::1\]:53
> 2018/06/13 13:57:33.929804 length=6 from=0 to=5
hello
...
10787/0x195e5: select(0x7, 0x7FFEE218C6F8, 0x7FFEE218C778, 0x0, 0x0) = 1 0
10787/0x195e5: accept(0x5, 0x7FC825E0B7B0, 0x7FC825E0B830) = 8 0
10787/0x195e5: fcntl(0x8, 0x3, 0x0) = 6 0
10787/0x195e5: fcntl(0x8, 0x4, 0x6) = 0 0
10787/0x195e5: select(0x9, 0x7FFEE218C6F8, 0x7FFEE218C778, 0x0, 0x7FFEE218C818) = 1 0
10787/0x195e5: recvfrom(0x8, 0x7FC82717E200, 0x2) = 2 0
10787/0x195e5: recvfrom(0x8, 0x7FC82717E200, 0x6865) = 4 0
10787/0x195e5: select(0x9, 0x7FFEE218C6F8, 0x7FFEE218C778, 0x0, 0x7FFEE218C818) = 1 0
10787/0x195e5: recvfrom(0x8, 0x7FC82717E204, 0x6861) = 0 0
10787/0x195e5: close(0x8) = 0 0
./unbound -h
usage: unbound [options]
start unbound daemon DNS resolver.
-h this help
-c file config file to read instead of /usr/local/etc/unbound/unbound.conf
file format is described in unbound.conf(5).
-d do not fork into the background.
-v verbose (more times to increase verbosity)
Version 1.5.1
linked libs: mini-event internal (it uses select), OpenSSL 1.0.2o 27 Mar 2018
linked modules: dns64 validator iterator
BSD licensed, see LICENSE in source package for details.
Report bugs to unbound-bugs@nlnetlabs.nl
shasum ./unbound
53823b2a8dfb4ceb6a631a331d30171f40f4ea91 ./unbound
sudo dtruss -f ./unbound -c /etc/com.apple.mis.unbound.conf -d -vvvvv
PID/THRD SYSCALL(args) = return
[1528887005] unbound[10011:0] notice: Start of unbound 1.5.1.
[1528887005] unbound[10011:0] debug: creating udp6 socket :: 53
[1528887005] unbound[10011:0] debug: creating tcp6 socket :: 53
[1528887005] unbound[10011:0] debug: switching log to syslog
10011/0x1192f: madvise(0x103215000, 0x2000, 0x5) = 0 0
10011/0x1192f: open("/dev/dtracehelper\0", 0x2, 0xFFFFFFFFECCAEA20) = 3 0
10011/0x1192f: ioctl(0x3, 0x80086804, 0x7FFEECCAE980) = 0 0
10011/0x1192f: close(0x3) = 0 0
10011/0x1192f: access("/AppleInternal/XBS/.isChrooted\0", 0x0, 0x0) = -1 Err#2
10011/0x1192f: thread_selfid(0x0, 0x0, 0x0) = 71983 0
10011/0x1192f: bsdthread_register(0x7FFF53CF8BEC, 0x7FFF53CF8BDC, 0x2000) = 1073742047 0
10011/0x1192f: issetugid(0x0, 0x0, 0x0) = 0 0
10011/0x1192f: mprotect(0x103265000, 0x1000, 0x0) = 0 0
10011/0x1192f: mprotect(0x10326C000, 0x1000, 0x0) = 0 0
10011/0x1192f: mprotect(0x10326D000, 0x1000, 0x0) = 0 0
10011/0x1192f: mprotect(0x103274000, 0x1000, 0x0) = 0 0
10011/0x1192f: mprotect(0x103017000, 0x88, 0x1) = 0 0
10011/0x1192f: mprotect(0x103019000, 0x1000, 0x1) = 0 0
10011/0x1192f: mprotect(0x103017000, 0x88, 0x3) = 0 0
10011/0x1192f: mprotect(0x103017000, 0x88, 0x1) = 0 0
10011/0x1192f: getpid(0x0, 0x0, 0x0) = 10011 0
10011/0x1192f: stat64("/AppleInternal/XBS/.isChrooted\0", 0x7FFEECCADF48, 0x0) = -1 Err#2
10011/0x1192f: stat64("/AppleInternal\0", 0x7FFEECCADFE0, 0x0) = -1 Err#2
10011/0x1192f: csops(0x271B, 0x7, 0x7FFEECCADA80) = 0 0
10011/0x1192f: sysctl([CTL_KERN, 14, 1, 10011, 0, 0] (4), 0x7FFEECCADBC8, 0x7FFEECCADBC0, 0x0, 0x0) = 0 0
10011/0x1192f: csops(0x271B, 0x7, 0x7FFEECCAD370) = 0 0
10011/0x1192f: sigaction(0xF, 0x7FFEECCAF7E8, 0x7FFEECCAF810) = 0 0
10011/0x1192f: sigaction(0x3, 0x7FFEECCAF7E8, 0x7FFEECCAF810) = 0 0
10011/0x1192f: sigaction(0x1, 0x7FFEECCAF7E8, 0x7FFEECCAF810) = 0 0
10011/0x1192f: sigaction(0xD, 0x7FFEECCAF7E8, 0x7FFEECCAF810) = 0 0
10011/0x1192f: sigaction(0x2, 0x7FFEECCAF7E8, 0x7FFEECCAF810) = 0 0
10011/0x1192f: getrlimit(0x1008, 0x7FFEECCAF630, 0x0) = 0 0
10011/0x1192f: open_nocancel("/usr/local/etc/openssl/openssl.cnf\0", 0x0, 0x1B6) = 3 0
10011/0x1192f: fstat64(0x3, 0x7FFEECCAF528, 0x0) = 0 0
10011/0x1192f: read_nocancel(0x3, "#\n# OpenSSL example configuration file.\n# This is mostly being used for generation of certificate requests.\n#\n\n# This definition stops the following lines choking if HOME isn't\n# defined.\nHOME\t\t\t= .\nRANDFILE\t\t= $ENV::HOME/.rnd\n\n# Extra OBJECT IDENTIFIER in", 0x10000) = 10835 0
10011/0x1192f: read_nocancel(0x3, " TSA examples.\ntsa_policy1 = 1.2.3.4.1\ntsa_policy2 = 1.2.3.4.5.6\ntsa_policy3 = 1.2.3.4.5.7\n\n####################################################################\n[ ca ]\ndefault_ca\t= CA_default\t\t# The default ca section\n\n#####################################", 0x10000) = 0 0
10011/0x1192f: close_nocancel(0x3) = 0 0
10011/0x1192f: getattrlist("/usr\0", 0x10F7C4F98, 0x7FFEECCAE1B0) = 0 0
10011/0x1192f: getattrlist("/usr/local\0", 0x10F7C4F98, 0x7FFEECCAE1B0) = 0 0
10011/0x1192f: getattrlist("/usr/local/Cellar\0", 0x10F7C4F98, 0x7FFEECCAE1B0) = 0 0
10011/0x1192f: getattrlist("/usr/local/Cellar/openssl\0", 0x10F7C4F98, 0x7FFEECCAE1B0) = 0 0
10011/0x1192f: getattrlist("/usr/local/Cellar/openssl/1.0.2o_1\0", 0x10F7C4F98, 0x7FFEECCAE1B0) = 0 0
10011/0x1192f: getattrlist("/usr/local/Cellar/openssl/1.0.2o_1/lib\0", 0x10F7C4F98, 0x7FFEECCAE1B0) = 0 0
10011/0x1192f: getattrlist("/usr/local/Cellar/openssl/1.0.2o_1/lib/engines\0", 0x10F7C4F98, 0x7FFEECCAE1B0) = 0 0
10011/0x1192f: getattrlist("/usr/local/Cellar/openssl/1.0.2o_1/lib/engines/libgost.dylib\0", 0x10F7C4F98, 0x7FFEECCAE1B0) = 0 0
10011/0x1192f: stat64("/usr/local/Cellar/openssl/1.0.2o_1/lib/engines/libgost.dylib\0", 0x7FFEECCAEA70, 0x0) = 0 0
10011/0x1192f: open("/usr/local/Cellar/openssl/1.0.2o_1/lib/engines/libgost.dylib\0", 0x0, 0x0) = 3 0
10011/0x1192f: pread(0x3, "\317\372\355\376\a\0", 0x1000, 0x0) = 4096 0
10011/0x1192f: mmap(0x103675000, 0x12000, 0x5, 0x12, 0x3, 0x0) = 0x103675000 0
10011/0x1192f: mmap(0x103687000, 0x2000, 0x3, 0x12, 0x3, 0x12000) = 0x103687000 0
10011/0x1192f: mmap(0x10368A000, 0x6D68, 0x1, 0x12, 0x3, 0x14000) = 0x10368A000 0
10011/0x1192f: close(0x3) = 0 0
10011/0x1192f: getattrlist("/usr\0", 0x10F7C4F98, 0x7FFEECCADFD0) = 0 0
10011/0x1192f: getattrlist("/usr/local\0", 0x10F7C4F98, 0x7FFEECCADFD0) = 0 0
10011/0x1192f: getattrlist("/usr/local/Cellar\0", 0x10F7C4F98, 0x7FFEECCADFD0) = 0 0
10011/0x1192f: getattrlist("/usr/local/Cellar/openssl\0", 0x10F7C4F98, 0x7FFEECCADFD0) = 0 0
10011/0x1192f: getattrlist("/usr/local/Cellar/openssl/1.0.2o_1\0", 0x10F7C4F98, 0x7FFEECCADFD0) = 0 0
10011/0x1192f: getattrlist("/usr/local/Cellar/openssl/1.0.2o_1/lib\0", 0x10F7C4F98, 0x7FFEECCADFD0) = 0 0
10011/0x1192f: getattrlist("/usr/local/Cellar/openssl/1.0.2o_1/lib/libcrypto.1.0.0.dylib\0", 0x10F7C4F98, 0x7FFEECCADFD0) = 0 0
10011/0x1192f: stat64("/usr/local/Cellar/openssl/1.0.2o_1/lib/libcrypto.1.0.0.dylib\0", 0x7FFEECCAE890, 0x0) = 0 0
10011/0x1192f: access("/etc/localtime\0", 0x4, 0x0) = 0 0
10011/0x1192f: open_nocancel("/etc/localtime\0", 0x0, 0x0) = 3 0
10011/0x1192f: fstat64(0x3, 0x7FFEECCAF318, 0x0) = 0 0
10011/0x1192f: read_nocancel(0x3, "TZif2\0", 0xA1E8) = 1931 0
10011/0x1192f: close_nocancel(0x3) = 0 0
10011/0x1192f: issetugid(0x0, 0x0, 0x0) = 0 0
10011/0x1192f: open_nocancel("/var/db/timezone/zoneinfo/posixrules\0", 0x0, 0x0) = 3 0
10011/0x1192f: fstat64(0x3, 0x7FFEECCAF168, 0x0) = 0 0
10011/0x1192f: read_nocancel(0x3, "TZif2\0", 0xA1E8) = 3519 0
10011/0x1192f: close_nocancel(0x3) = 0 0
10011/0x1192f: shm_open(0x7FFF53CEDDEF, 0x0, 0x0) = 3 0
10011/0x1192f: mmap(0x0, 0x1000, 0x1, 0x1, 0x3, 0x0) = 0x103077000 0
10011/0x1192f: close_nocancel(0x3) = 0 0
10011/0x1192f: write_nocancel(0x2, "[1528887005] unbound[10011:0] notice: Start of unbound 1.5.1.\n`\0", 0x3E) = 62 0
10011/0x1192f: open_nocancel("/etc/com.apple.mis.unbound.conf\0", 0x0, 0x1B6) = 3 0
10011/0x1192f: ioctl(0x3, 0x4004667A, 0x7FFEECCAEEC4) = -1 Err#25
10011/0x1192f: ioctl(0x3, 0x40487413, 0x7FFEECCAEEC8) = -1 Err#25
10011/0x1192f: fstat64(0x3, 0x7FFEECCAED98, 0x0) = 0 0
10011/0x1192f: read_nocancel(0x3, "server:\n\tchroot: \"\"\n\tpidfile: \"/etc/unbound.pid\"\n\tchroot: \"\"\n\tdirectory: \"/etc\"\n\tusername: \"\"\n\tdo-daemonize: no\n\taccess-control: ::0/0 allow\n\tmodule-config: \"dns64 iterator\"\n\tdns64-synthall: yes\n\tdns64-prefix: 2001:2:0:1baa::/96\n\tinterface: ::0\nforward-zon", 0x10000) = 293 0
10011/0x1192f: read_nocancel(0x3, "\0", 0x10000) = 0 0
10011/0x1192f: ioctl(0x3, 0x4004667A, 0x7FFEECCAEEF4) = -1 Err#25
10011/0x1192f: ioctl(0x3, 0x40487413, 0x7FFEECCAEEF8) = -1 Err#25
10011/0x1192f: close_nocancel(0x3) = 0 0
10011/0x1192f: getrlimit(0x1008, 0x7FFEECCAF8A0, 0x0) = 0 0
10011/0x1192f: open_nocancel("/etc/.mdns_debug\0", 0x0, 0x0) = 3 0
10011/0x1192f: read_nocancel(0x3, "OEA\n\0", 0x4) = 4 0
10011/0x1192f: write_nocancel(0x2, "[1528887005] unbound[10011:0] debug: creating udp6 socket :: 53\n\0", 0x40) = 64 0
10011/0x1192f: socket(0x1E, 0x2, 0x0) = 4 0
10011/0x1192f: setsockopt(0x4, 0xFFFF, 0x4) = 0 0
10011/0x1192f: setsockopt(0x4, 0x29, 0x1B) = 0 0
10011/0x1192f: bind(0x4, 0x7FCAEA602150, 0x1C) = 0 0
10011/0x1192f: fcntl(0x4, 0x3, 0x0) = 2 0
10011/0x1192f: fcntl(0x4, 0x4, 0x6) = 0 0
10011/0x1192f: write_nocancel(0x2, "[1528887005] unbound[10011:0] debug: creating tcp6 socket :: 53\n\0", 0x40) = 64 0
10011/0x1192f: socket(0x1E, 0x1, 0x0) = 5 0
10011/0x1192f: setsockopt(0x5, 0xFFFF, 0x4) = 0 0
10011/0x1192f: setsockopt(0x5, 0x29, 0x1B) = 0 0
10011/0x1192f: bind(0x5, 0x7FCAEA602170, 0x1C) = 0 0
10011/0x1192f: fcntl(0x5, 0x3, 0x0) = 2 0
10011/0x1192f: fcntl(0x5, 0x4, 0x6) = 0 0
10011/0x1192f: listen(0x5, 0x100, 0x0) = 0 0
10011/0x1192f: write_nocancel(0x2, "[1528887005] unbound[10011:0] debug: switching log to syslog\n\0", 0x3D) = 61 0
10011/0x1192f: getuid(0x0, 0x0, 0x0) = 0 0
10011/0x1192f: getgid(0x0, 0x0, 0x0) = 0 0
10011/0x1192f: geteuid(0x0, 0x0, 0x0) = 0 0
10011/0x1192f: open("/dev/urandom\0", 0x20004, 0xFFFFFFFFFFFFFFE0) = 6 0
10011/0x1192f: fstat64(0x6, 0x7FFEECCAF540, 0x0) = 0 0
10011/0x1192f: select(0x7, 0x7FFEECCAF490, 0x0, 0x0, 0x7FFEECCAF510) = 1 0
10011/0x1192f: read(0x6, "\252i\232V3\246\212\031\006\236T~6t\211@\200\242H\271\302\233'\237\270pMJ\223\312\033l\0", 0x20) = 32 0
10011/0x1192f: close(0x6) = 0 0
10011/0x1192f: getuid(0x0, 0x0, 0x0) = 0 0
10011/0x1192f: open("/etc/unbound.pid\0", 0x0, 0x0) = 6 0
10011/0x1192f: read(0x6, "10001\n\0", 0x20) = 6 0
10011/0x1192f: close(0x6) = 0 0
10011/0x1192f: kill(10001, 0) = -1 Err#3
10011/0x1192f: proc_info(0x2, 0x271B, 0x11) = 56 0
10011/0x1192f: proc_info(0x2, 0x271B, 0x11) = 56 0
10011/0x1192f: ulock_wake(0x102, 0x1036D1400, 0x0) = -1 Err#2
10011/0x1192f: sysctl([CTL_KERN, 14, 1, 10011, 0, 0] (4), 0x7FFEECCACA28, 0x7FFEECCACA18, 0x0, 0x0) = 0 0
10011/0x1192f: issetugid(0x0, 0x0, 0x0) = 0 0
10011/0x1192f: open("/Users/azolotko/Projects/apptopia/network_cmds-543/unbound/./unbound\0", 0x8004, 0x53D3AB2E) = 6 0
10011/0x1192f: fcntl(0x6, 0x32, 0x7FFEECCABDB0) = 0 0
10011/0x1192f: close(0x6) = 0 0
10011/0x1192f: ulock_wake(0x102, 0x1036D1280, 0x0) = -1 Err#2
10011/0x1192f: open_nocancel("/etc/unbound.pid\0", 0x601, 0x1B6) = 6 0
10011/0x1192f: fstat64(0x6, 0x7FFEECCAF518, 0x0) = 0 0
10011/0x1192f: write_nocancel(0x6, "10011\n\0", 0x6) = 6 0
10011/0x1192f: close_nocancel(0x6) = 0 0
10011/0x1192f: chdir("/etc\0", 0x0, 0x0) = 0 0
10011/0x1192f: ulock_wake(0x102, 0x1036D1380, 0x0) = -1 Err#2
10011/0x1192f: getentropy(0x7FFEECCAF640, 0x20, 0x0) = 0 0
10011/0x1192f: socketpair(0x1, 0x1, 0x0) = 0 0
10011/0x1192f: fcntl(0x6, 0x3, 0x0) = 2 0
10011/0x1192f: fcntl(0x6, 0x4, 0x6) = 0 0
10011/0x1192f: fcntl(0x7, 0x3, 0x0) = 2 0
10011/0x1192f: fcntl(0x7, 0x4, 0x6) = 0 0
10011/0x1192f: madvise(0x103711000, 0x40000, 0x9) = 0 0
10011/0x1192f: __pthread_sigmask(0x2, 0x7FFEECC9F440, 0x0) = 0 0
10011/0x1192f: __pthread_sigmask(0x2, 0x7FFEECC9F440, 0x0) = 0 0
10011/0x1192f: __pthread_sigmask(0x2, 0x7FFEECC9F440, 0x0) = 0 0
10011/0x1192f: __pthread_sigmask(0x2, 0x7FFEECC9F440, 0x0) = 0 0
10011/0x1192f: sigaction(0x1, 0x7FFEECC9F2F8, 0x7FFEECC9F320) = 0 0
10011/0x1192f: sigaction(0x3, 0x7FFEECC9F2F8, 0x7FFEECC9F320) = 0 0
10011/0x1192f: sigaction(0xF, 0x7FFEECC9F2F8, 0x7FFEECC9F320) = 0 0
10011/0x1192f: sigaction(0x2, 0x7FFEECC9F2F8, 0x7FFEECC9F320) = 0 0
...
echo "hello" | socat -v - UDP-DATAGRAM:\[2001:2:0:aab1::1\]:53
> 2018/06/13 12:50:53.535801 length=6 from=0 to=5
hello
...
10011/0x1192f: select(0x7, 0x7FFEECCAF538, 0x7FFEECCAF5B8, 0x0, 0x0) = 1 0
10011/0x1192f: recvfrom(0x4, 0x7FCAEB018400, 0x10010) = 6 0
10011/0x1192f: recvfrom(0x4, 0x7FCAEB018400, 0x10010) = -1 Err#35
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