diff options
Diffstat (limited to 'src/grp-resolve/systemd-resolve')
| -rw-r--r-- | src/grp-resolve/systemd-resolve/Makefile | 53 | ||||
| -rw-r--r-- | src/grp-resolve/systemd-resolve/resolve-tool.c | 2007 | ||||
| -rw-r--r-- | src/grp-resolve/systemd-resolve/systemd-resolve.completion.bash | 64 | ||||
| -rw-r--r-- | src/grp-resolve/systemd-resolve/systemd-resolve.completion.zsh | 64 | ||||
| -rw-r--r-- | src/grp-resolve/systemd-resolve/systemd-resolve.xml | 394 |
5 files changed, 2582 insertions, 0 deletions
diff --git a/src/grp-resolve/systemd-resolve/Makefile b/src/grp-resolve/systemd-resolve/Makefile new file mode 100644 index 0000000000..9d9b46d58d --- /dev/null +++ b/src/grp-resolve/systemd-resolve/Makefile @@ -0,0 +1,53 @@ +# -*- Mode: makefile; indent-tabs-mode: t -*- +# +# This file is part of systemd. +# +# Copyright 2010-2012 Lennart Poettering +# Copyright 2010-2012 Kay Sievers +# Copyright 2013 Zbigniew Jędrzejewski-Szmek +# Copyright 2013 David Strauss +# Copyright 2016 Luke Shumaker +# +# systemd is free software; you can redistribute it and/or modify it +# under the terms of the GNU Lesser General Public License as published by +# the Free Software Foundation; either version 2.1 of the License, or +# (at your option) any later version. +# +# systemd is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public License +# along with systemd; If not, see <http://www.gnu.org/licenses/>. +include $(dir $(lastword $(MAKEFILE_LIST)))/../../../config.mk +include $(topsrcdir)/build-aux/Makefile.head.mk + +systemd_resolve_SOURCES = \ + src/resolve/resolve-tool.c \ + $(basic_dns_sources) \ + src/shared/gcrypt-util.c \ + src/shared/gcrypt-util.h + +nodist_systemd_resolve_SOURCES = \ + src/resolve/dns_type-from-name.h \ + src/resolve/dns_type-to-name.h + +systemd_resolve_CFLAGS = \ + $(GCRYPT_CFLAGS) + +systemd_resolve_LDADD = \ + libsystemd-shared.la \ + $(GCRYPT_LIBS) \ + -lm + +bin_PROGRAMS += \ + systemd-resolve + +dist_bashcompletion_data += \ + shell-completion/bash/systemd-resolve + +dist_zshcompletion_data += \ + shell-completion/zsh/_systemd-resolve + +include $(topsrcdir)/build-aux/Makefile.tail.mk diff --git a/src/grp-resolve/systemd-resolve/resolve-tool.c b/src/grp-resolve/systemd-resolve/resolve-tool.c new file mode 100644 index 0000000000..e810b8d891 --- /dev/null +++ b/src/grp-resolve/systemd-resolve/resolve-tool.c @@ -0,0 +1,2007 @@ +/*** + This file is part of systemd. + + Copyright 2014 Zbigniew Jędrzejewski-Szmek + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <getopt.h> +#include <net/if.h> + +#include <systemd/sd-bus.h> + +#include "basic-dns/resolved-def.h" +#include "basic-dns/resolved-dns-packet.h" +#include "sd-bus/bus-error.h" +#include "sd-netlink/netlink-util.h" +#include "systemd-basic/af-list.h" +#include "systemd-basic/alloc-util.h" +#include "systemd-basic/escape.h" +#include "systemd-basic/in-addr-util.h" +#include "systemd-basic/parse-util.h" +#include "systemd-basic/strv.h" +#include "systemd-basic/terminal-util.h" +#include "systemd-gcrypt/gcrypt-util.h" +#include "systemd-shared/bus-util.h" +#include "systemd-shared/pager.h" +#include "systemd-staging/sd-netlink.h" + +#define DNS_CALL_TIMEOUT_USEC (45*USEC_PER_SEC) + +static int arg_family = AF_UNSPEC; +static int arg_ifindex = 0; +static uint16_t arg_type = 0; +static uint16_t arg_class = 0; +static bool arg_legend = true; +static uint64_t arg_flags = 0; +static bool arg_no_pager = false; + +typedef enum ServiceFamily { + SERVICE_FAMILY_TCP, + SERVICE_FAMILY_UDP, + SERVICE_FAMILY_SCTP, + _SERVICE_FAMILY_INVALID = -1, +} ServiceFamily; +static ServiceFamily arg_service_family = SERVICE_FAMILY_TCP; + +typedef enum RawType { + RAW_NONE, + RAW_PAYLOAD, + RAW_PACKET, +} RawType; +static RawType arg_raw = RAW_NONE; + +static enum { + MODE_RESOLVE_HOST, + MODE_RESOLVE_RECORD, + MODE_RESOLVE_SERVICE, + MODE_RESOLVE_OPENPGP, + MODE_RESOLVE_TLSA, + MODE_STATISTICS, + MODE_RESET_STATISTICS, + MODE_FLUSH_CACHES, + MODE_STATUS, +} arg_mode = MODE_RESOLVE_HOST; + +static ServiceFamily service_family_from_string(const char *s) { + if (s == NULL || streq(s, "tcp")) + return SERVICE_FAMILY_TCP; + if (streq(s, "udp")) + return SERVICE_FAMILY_UDP; + if (streq(s, "sctp")) + return SERVICE_FAMILY_SCTP; + return _SERVICE_FAMILY_INVALID; +} + +static const char* service_family_to_string(ServiceFamily service) { + switch(service) { + case SERVICE_FAMILY_TCP: + return "_tcp"; + case SERVICE_FAMILY_UDP: + return "_udp"; + case SERVICE_FAMILY_SCTP: + return "_sctp"; + default: + assert_not_reached("invalid service"); + } +} + +static void print_source(uint64_t flags, usec_t rtt) { + char rtt_str[FORMAT_TIMESTAMP_MAX]; + + if (!arg_legend) + return; + + if (flags == 0) + return; + + fputs("\n-- Information acquired via", stdout); + + if (flags != 0) + printf(" protocol%s%s%s%s%s", + flags & SD_RESOLVED_DNS ? " DNS" :"", + flags & SD_RESOLVED_LLMNR_IPV4 ? " LLMNR/IPv4" : "", + flags & SD_RESOLVED_LLMNR_IPV6 ? " LLMNR/IPv6" : "", + flags & SD_RESOLVED_MDNS_IPV4 ? "mDNS/IPv4" : "", + flags & SD_RESOLVED_MDNS_IPV6 ? "mDNS/IPv6" : ""); + + assert_se(format_timespan(rtt_str, sizeof(rtt_str), rtt, 100)); + + printf(" in %s", rtt_str); + + fputc('.', stdout); + fputc('\n', stdout); + + printf("-- Data is authenticated: %s\n", yes_no(flags & SD_RESOLVED_AUTHENTICATED)); +} + +static int resolve_host(sd_bus *bus, const char *name) { + + _cleanup_(sd_bus_message_unrefp) sd_bus_message *req = NULL, *reply = NULL; + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + const char *canonical = NULL; + char ifname[IF_NAMESIZE] = ""; + unsigned c = 0; + int r; + uint64_t flags; + usec_t ts; + + assert(name); + + if (arg_ifindex > 0 && !if_indextoname(arg_ifindex, ifname)) + return log_error_errno(errno, "Failed to resolve interface name for index %i: %m", arg_ifindex); + + log_debug("Resolving %s (family %s, interface %s).", name, af_to_name(arg_family) ?: "*", isempty(ifname) ? "*" : ifname); + + r = sd_bus_message_new_method_call( + bus, + &req, + "org.freedesktop.resolve1", + "/org/freedesktop/resolve1", + "org.freedesktop.resolve1.Manager", + "ResolveHostname"); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_append(req, "isit", arg_ifindex, name, arg_family, arg_flags); + if (r < 0) + return bus_log_create_error(r); + + ts = now(CLOCK_MONOTONIC); + + r = sd_bus_call(bus, req, DNS_CALL_TIMEOUT_USEC, &error, &reply); + if (r < 0) + return log_error_errno(r, "%s: resolve call failed: %s", name, bus_error_message(&error, r)); + + ts = now(CLOCK_MONOTONIC) - ts; + + r = sd_bus_message_enter_container(reply, 'a', "(iiay)"); + if (r < 0) + return bus_log_parse_error(r); + + while ((r = sd_bus_message_enter_container(reply, 'r', "iiay")) > 0) { + _cleanup_free_ char *pretty = NULL; + int ifindex, family; + const void *a; + size_t sz; + + assert_cc(sizeof(int) == sizeof(int32_t)); + + r = sd_bus_message_read(reply, "ii", &ifindex, &family); + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_read_array(reply, 'y', &a, &sz); + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_exit_container(reply); + if (r < 0) + return bus_log_parse_error(r); + + if (!IN_SET(family, AF_INET, AF_INET6)) { + log_debug("%s: skipping entry with family %d (%s)", name, family, af_to_name(family) ?: "unknown"); + continue; + } + + if (sz != FAMILY_ADDRESS_SIZE(family)) { + log_error("%s: systemd-resolved returned address of invalid size %zu for family %s", name, sz, af_to_name(family) ?: "unknown"); + return -EINVAL; + } + + ifname[0] = 0; + if (ifindex > 0 && !if_indextoname(ifindex, ifname)) + log_warning_errno(errno, "Failed to resolve interface name for index %i: %m", ifindex); + + r = in_addr_ifindex_to_string(family, a, ifindex, &pretty); + if (r < 0) + return log_error_errno(r, "Failed to print address for %s: %m", name); + + printf("%*s%s %s%s%s\n", + (int) strlen(name), c == 0 ? name : "", c == 0 ? ":" : " ", + pretty, + isempty(ifname) ? "" : "%", ifname); + + c++; + } + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_exit_container(reply); + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_read(reply, "st", &canonical, &flags); + if (r < 0) + return bus_log_parse_error(r); + + if (!streq(name, canonical)) + printf("%*s%s (%s)\n", + (int) strlen(name), c == 0 ? name : "", c == 0 ? ":" : " ", + canonical); + + if (c == 0) { + log_error("%s: no addresses found", name); + return -ESRCH; + } + + print_source(flags, ts); + + return 0; +} + +static int resolve_address(sd_bus *bus, int family, const union in_addr_union *address, int ifindex) { + _cleanup_(sd_bus_message_unrefp) sd_bus_message *req = NULL, *reply = NULL; + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + _cleanup_free_ char *pretty = NULL; + char ifname[IF_NAMESIZE] = ""; + uint64_t flags; + unsigned c = 0; + usec_t ts; + int r; + + assert(bus); + assert(IN_SET(family, AF_INET, AF_INET6)); + assert(address); + + if (ifindex <= 0) + ifindex = arg_ifindex; + + r = in_addr_ifindex_to_string(family, address, ifindex, &pretty); + if (r < 0) + return log_oom(); + + if (ifindex > 0 && !if_indextoname(ifindex, ifname)) + return log_error_errno(errno, "Failed to resolve interface name for index %i: %m", ifindex); + + log_debug("Resolving %s%s%s.", pretty, isempty(ifname) ? "" : "%", ifname); + + r = sd_bus_message_new_method_call( + bus, + &req, + "org.freedesktop.resolve1", + "/org/freedesktop/resolve1", + "org.freedesktop.resolve1.Manager", + "ResolveAddress"); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_append(req, "ii", ifindex, family); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_append_array(req, 'y', address, FAMILY_ADDRESS_SIZE(family)); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_append(req, "t", arg_flags); + if (r < 0) + return bus_log_create_error(r); + + ts = now(CLOCK_MONOTONIC); + + r = sd_bus_call(bus, req, DNS_CALL_TIMEOUT_USEC, &error, &reply); + if (r < 0) { + log_error("%s: resolve call failed: %s", pretty, bus_error_message(&error, r)); + return r; + } + + ts = now(CLOCK_MONOTONIC) - ts; + + r = sd_bus_message_enter_container(reply, 'a', "(is)"); + if (r < 0) + return bus_log_create_error(r); + + while ((r = sd_bus_message_enter_container(reply, 'r', "is")) > 0) { + const char *n; + + assert_cc(sizeof(int) == sizeof(int32_t)); + + r = sd_bus_message_read(reply, "is", &ifindex, &n); + if (r < 0) + return r; + + r = sd_bus_message_exit_container(reply); + if (r < 0) + return r; + + ifname[0] = 0; + if (ifindex > 0 && !if_indextoname(ifindex, ifname)) + log_warning_errno(errno, "Failed to resolve interface name for index %i: %m", ifindex); + + printf("%*s%*s%*s%s %s\n", + (int) strlen(pretty), c == 0 ? pretty : "", + isempty(ifname) ? 0 : 1, c > 0 || isempty(ifname) ? "" : "%", + (int) strlen(ifname), c == 0 ? ifname : "", + c == 0 ? ":" : " ", + n); + + c++; + } + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_exit_container(reply); + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_read(reply, "t", &flags); + if (r < 0) + return bus_log_parse_error(r); + + if (c == 0) { + log_error("%s: no names found", pretty); + return -ESRCH; + } + + print_source(flags, ts); + + return 0; +} + +static int output_rr_packet(const void *d, size_t l, int ifindex) { + _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL; + _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL; + int r; + char ifname[IF_NAMESIZE] = ""; + + r = dns_packet_new(&p, DNS_PROTOCOL_DNS, 0); + if (r < 0) + return log_oom(); + + p->refuse_compression = true; + + r = dns_packet_append_blob(p, d, l, NULL); + if (r < 0) + return log_oom(); + + r = dns_packet_read_rr(p, &rr, NULL, NULL); + if (r < 0) + return log_error_errno(r, "Failed to parse RR: %m"); + + if (arg_raw == RAW_PAYLOAD) { + void *data; + ssize_t k; + + k = dns_resource_record_payload(rr, &data); + if (k < 0) + return log_error_errno(k, "Cannot dump RR: %m"); + fwrite(data, 1, k, stdout); + } else { + const char *s; + + s = dns_resource_record_to_string(rr); + if (!s) + return log_oom(); + + if (ifindex > 0 && !if_indextoname(ifindex, ifname)) + log_warning_errno(errno, "Failed to resolve interface name for index %i: %m", ifindex); + + printf("%s%s%s\n", s, isempty(ifname) ? "" : " # interface ", ifname); + } + + return 0; +} + +static int resolve_record(sd_bus *bus, const char *name, uint16_t class, uint16_t type) { + _cleanup_(sd_bus_message_unrefp) sd_bus_message *req = NULL, *reply = NULL; + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + char ifname[IF_NAMESIZE] = ""; + unsigned n = 0; + uint64_t flags; + int r; + usec_t ts; + bool needs_authentication = false; + + assert(name); + + if (arg_ifindex > 0 && !if_indextoname(arg_ifindex, ifname)) + return log_error_errno(errno, "Failed to resolve interface name for index %i: %m", arg_ifindex); + + log_debug("Resolving %s %s %s (interface %s).", name, dns_class_to_string(class), dns_type_to_string(type), isempty(ifname) ? "*" : ifname); + + r = sd_bus_message_new_method_call( + bus, + &req, + "org.freedesktop.resolve1", + "/org/freedesktop/resolve1", + "org.freedesktop.resolve1.Manager", + "ResolveRecord"); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_append(req, "isqqt", arg_ifindex, name, class, type, arg_flags); + if (r < 0) + return bus_log_create_error(r); + + ts = now(CLOCK_MONOTONIC); + + r = sd_bus_call(bus, req, DNS_CALL_TIMEOUT_USEC, &error, &reply); + if (r < 0) { + log_error("%s: resolve call failed: %s", name, bus_error_message(&error, r)); + return r; + } + + ts = now(CLOCK_MONOTONIC) - ts; + + r = sd_bus_message_enter_container(reply, 'a', "(iqqay)"); + if (r < 0) + return bus_log_parse_error(r); + + while ((r = sd_bus_message_enter_container(reply, 'r', "iqqay")) > 0) { + uint16_t c, t; + int ifindex; + const void *d; + size_t l; + + assert_cc(sizeof(int) == sizeof(int32_t)); + + r = sd_bus_message_read(reply, "iqq", &ifindex, &c, &t); + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_read_array(reply, 'y', &d, &l); + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_exit_container(reply); + if (r < 0) + return bus_log_parse_error(r); + + if (arg_raw == RAW_PACKET) { + uint64_t u64 = htole64(l); + + fwrite(&u64, sizeof(u64), 1, stdout); + fwrite(d, 1, l, stdout); + } else { + r = output_rr_packet(d, l, ifindex); + if (r < 0) + return r; + } + + if (dns_type_needs_authentication(t)) + needs_authentication = true; + + n++; + } + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_exit_container(reply); + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_read(reply, "t", &flags); + if (r < 0) + return bus_log_parse_error(r); + + if (n == 0) { + log_error("%s: no records found", name); + return -ESRCH; + } + + print_source(flags, ts); + + if ((flags & SD_RESOLVED_AUTHENTICATED) == 0 && needs_authentication) { + fflush(stdout); + + fprintf(stderr, "\n%s" + "WARNING: The resources shown contain cryptographic key data which could not be\n" + " authenticated. It is not suitable to authenticate any communication.\n" + " This is usually indication that DNSSEC authentication was not enabled\n" + " or is not available for the selected protocol or DNS servers.%s\n", + ansi_highlight_red(), + ansi_normal()); + } + + return 0; +} + +static int resolve_rfc4501(sd_bus *bus, const char *name) { + uint16_t type = 0, class = 0; + const char *p, *q, *n; + int r; + + assert(bus); + assert(name); + assert(startswith(name, "dns:")); + + /* Parse RFC 4501 dns: URIs */ + + p = name + 4; + + if (p[0] == '/') { + const char *e; + + if (p[1] != '/') + goto invalid; + + e = strchr(p + 2, '/'); + if (!e) + goto invalid; + + if (e != p + 2) + log_warning("DNS authority specification not supported; ignoring specified authority."); + + p = e + 1; + } + + q = strchr(p, '?'); + if (q) { + n = strndupa(p, q - p); + q++; + + for (;;) { + const char *f; + + f = startswith_no_case(q, "class="); + if (f) { + _cleanup_free_ char *t = NULL; + const char *e; + + if (class != 0) { + log_error("DNS class specified twice."); + return -EINVAL; + } + + e = strchrnul(f, ';'); + t = strndup(f, e - f); + if (!t) + return log_oom(); + + r = dns_class_from_string(t); + if (r < 0) { + log_error("Unknown DNS class %s.", t); + return -EINVAL; + } + + class = r; + + if (*e == ';') { + q = e + 1; + continue; + } + + break; + } + + f = startswith_no_case(q, "type="); + if (f) { + _cleanup_free_ char *t = NULL; + const char *e; + + if (type != 0) { + log_error("DNS type specified twice."); + return -EINVAL; + } + + e = strchrnul(f, ';'); + t = strndup(f, e - f); + if (!t) + return log_oom(); + + r = dns_type_from_string(t); + if (r < 0) { + log_error("Unknown DNS type %s.", t); + return -EINVAL; + } + + type = r; + + if (*e == ';') { + q = e + 1; + continue; + } + + break; + } + + goto invalid; + } + } else + n = p; + + if (class == 0) + class = arg_class ?: DNS_CLASS_IN; + if (type == 0) + type = arg_type ?: DNS_TYPE_A; + + return resolve_record(bus, n, class, type); + +invalid: + log_error("Invalid DNS URI: %s", name); + return -EINVAL; +} + +static int resolve_service(sd_bus *bus, const char *name, const char *type, const char *domain) { + const char *canonical_name, *canonical_type, *canonical_domain; + _cleanup_(sd_bus_message_unrefp) sd_bus_message *req = NULL, *reply = NULL; + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + char ifname[IF_NAMESIZE] = ""; + size_t indent, sz; + uint64_t flags; + const char *p; + unsigned c; + usec_t ts; + int r; + + assert(bus); + assert(domain); + + name = empty_to_null(name); + type = empty_to_null(type); + + if (arg_ifindex > 0 && !if_indextoname(arg_ifindex, ifname)) + return log_error_errno(errno, "Failed to resolve interface name for index %i: %m", arg_ifindex); + + if (name) + log_debug("Resolving service \"%s\" of type %s in %s (family %s, interface %s).", name, type, domain, af_to_name(arg_family) ?: "*", isempty(ifname) ? "*" : ifname); + else if (type) + log_debug("Resolving service type %s of %s (family %s, interface %s).", type, domain, af_to_name(arg_family) ?: "*", isempty(ifname) ? "*" : ifname); + else + log_debug("Resolving service type %s (family %s, interface %s).", domain, af_to_name(arg_family) ?: "*", isempty(ifname) ? "*" : ifname); + + r = sd_bus_message_new_method_call( + bus, + &req, + "org.freedesktop.resolve1", + "/org/freedesktop/resolve1", + "org.freedesktop.resolve1.Manager", + "ResolveService"); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_append(req, "isssit", arg_ifindex, name, type, domain, arg_family, arg_flags); + if (r < 0) + return bus_log_create_error(r); + + ts = now(CLOCK_MONOTONIC); + + r = sd_bus_call(bus, req, DNS_CALL_TIMEOUT_USEC, &error, &reply); + if (r < 0) + return log_error_errno(r, "Resolve call failed: %s", bus_error_message(&error, r)); + + ts = now(CLOCK_MONOTONIC) - ts; + + r = sd_bus_message_enter_container(reply, 'a', "(qqqsa(iiay)s)"); + if (r < 0) + return bus_log_parse_error(r); + + indent = + (name ? strlen(name) + 1 : 0) + + (type ? strlen(type) + 1 : 0) + + strlen(domain) + 2; + + c = 0; + while ((r = sd_bus_message_enter_container(reply, 'r', "qqqsa(iiay)s")) > 0) { + uint16_t priority, weight, port; + const char *hostname, *canonical; + + r = sd_bus_message_read(reply, "qqqs", &priority, &weight, &port, &hostname); + if (r < 0) + return bus_log_parse_error(r); + + if (name) + printf("%*s%s", (int) strlen(name), c == 0 ? name : "", c == 0 ? "/" : " "); + if (type) + printf("%*s%s", (int) strlen(type), c == 0 ? type : "", c == 0 ? "/" : " "); + + printf("%*s%s %s:%u [priority=%u, weight=%u]\n", + (int) strlen(domain), c == 0 ? domain : "", + c == 0 ? ":" : " ", + hostname, port, + priority, weight); + + r = sd_bus_message_enter_container(reply, 'a', "(iiay)"); + if (r < 0) + return bus_log_parse_error(r); + + while ((r = sd_bus_message_enter_container(reply, 'r', "iiay")) > 0) { + _cleanup_free_ char *pretty = NULL; + int ifindex, family; + const void *a; + + assert_cc(sizeof(int) == sizeof(int32_t)); + + r = sd_bus_message_read(reply, "ii", &ifindex, &family); + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_read_array(reply, 'y', &a, &sz); + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_exit_container(reply); + if (r < 0) + return bus_log_parse_error(r); + + if (!IN_SET(family, AF_INET, AF_INET6)) { + log_debug("%s: skipping entry with family %d (%s)", name, family, af_to_name(family) ?: "unknown"); + continue; + } + + if (sz != FAMILY_ADDRESS_SIZE(family)) { + log_error("%s: systemd-resolved returned address of invalid size %zu for family %s", name, sz, af_to_name(family) ?: "unknown"); + return -EINVAL; + } + + ifname[0] = 0; + if (ifindex > 0 && !if_indextoname(ifindex, ifname)) + log_warning_errno(errno, "Failed to resolve interface name for index %i: %m", ifindex); + + r = in_addr_to_string(family, a, &pretty); + if (r < 0) + return log_error_errno(r, "Failed to print address for %s: %m", name); + + printf("%*s%s%s%s\n", (int) indent, "", pretty, isempty(ifname) ? "" : "%s", ifname); + } + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_exit_container(reply); + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_read(reply, "s", &canonical); + if (r < 0) + return bus_log_parse_error(r); + + if (!streq(hostname, canonical)) + printf("%*s(%s)\n", (int) indent, "", canonical); + + r = sd_bus_message_exit_container(reply); + if (r < 0) + return bus_log_parse_error(r); + + c++; + } + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_exit_container(reply); + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_enter_container(reply, 'a', "ay"); + if (r < 0) + return bus_log_parse_error(r); + + c = 0; + while ((r = sd_bus_message_read_array(reply, 'y', (const void**) &p, &sz)) > 0) { + _cleanup_free_ char *escaped = NULL; + + escaped = cescape_length(p, sz); + if (!escaped) + return log_oom(); + + printf("%*s%s\n", (int) indent, "", escaped); + c++; + } + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_exit_container(reply); + if (r < 0) + return bus_log_parse_error(r); + + r = sd_bus_message_read(reply, "ssst", &canonical_name, &canonical_type, &canonical_domain, &flags); + if (r < 0) + return bus_log_parse_error(r); + + canonical_name = empty_to_null(canonical_name); + canonical_type = empty_to_null(canonical_type); + + if (!streq_ptr(name, canonical_name) || + !streq_ptr(type, canonical_type) || + !streq_ptr(domain, canonical_domain)) { + + printf("%*s(", (int) indent, ""); + + if (canonical_name) + printf("%s/", canonical_name); + if (canonical_type) + printf("%s/", canonical_type); + + printf("%s)\n", canonical_domain); + } + + print_source(flags, ts); + + return 0; +} + +static int resolve_openpgp(sd_bus *bus, const char *address) { + const char *domain, *full; + int r; + _cleanup_free_ char *hashed = NULL; + + assert(bus); + assert(address); + + domain = strrchr(address, '@'); + if (!domain) { + log_error("Address does not contain '@': \"%s\"", address); + return -EINVAL; + } else if (domain == address || domain[1] == '\0') { + log_error("Address starts or ends with '@': \"%s\"", address); + return -EINVAL; + } + domain++; + + r = string_hashsum_sha224(address, domain - 1 - address, &hashed); + if (r < 0) + return log_error_errno(r, "Hashing failed: %m"); + + full = strjoina(hashed, "._openpgpkey.", domain); + log_debug("Looking up \"%s\".", full); + + return resolve_record(bus, full, + arg_class ?: DNS_CLASS_IN, + arg_type ?: DNS_TYPE_OPENPGPKEY); +} + +static int resolve_tlsa(sd_bus *bus, const char *address) { + const char *port; + uint16_t port_num = 443; + _cleanup_free_ char *full = NULL; + int r; + + assert(bus); + assert(address); + + port = strrchr(address, ':'); + if (port) { + r = safe_atou16(port + 1, &port_num); + if (r < 0 || port_num == 0) + return log_error_errno(r, "Invalid port \"%s\".", port + 1); + + address = strndupa(address, port - address); + } + + r = asprintf(&full, "_%u.%s.%s", + port_num, + service_family_to_string(arg_service_family), + address); + if (r < 0) + return log_oom(); + + log_debug("Looking up \"%s\".", full); + + return resolve_record(bus, full, + arg_class ?: DNS_CLASS_IN, + arg_type ?: DNS_TYPE_TLSA); +} + +static int show_statistics(sd_bus *bus) { + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; + uint64_t n_current_transactions, n_total_transactions, + cache_size, n_cache_hit, n_cache_miss, + n_dnssec_secure, n_dnssec_insecure, n_dnssec_bogus, n_dnssec_indeterminate; + int r, dnssec_supported; + + assert(bus); + + r = sd_bus_get_property_trivial(bus, + "org.freedesktop.resolve1", + "/org/freedesktop/resolve1", + "org.freedesktop.resolve1.Manager", + "DNSSECSupported", + &error, + 'b', + &dnssec_supported); + if (r < 0) + return log_error_errno(r, "Failed to get DNSSEC supported state: %s", bus_error_message(&error, r)); + + printf("DNSSEC supported by current servers: %s%s%s\n\n", + ansi_highlight(), + yes_no(dnssec_supported), + ansi_normal()); + + r = sd_bus_get_property(bus, + "org.freedesktop.resolve1", + "/org/freedesktop/resolve1", + "org.freedesktop.resolve1.Manager", + "TransactionStatistics", + &error, + &reply, + "(tt)"); + if (r < 0) + return log_error_errno(r, "Failed to get transaction statistics: %s", bus_error_message(&error, r)); + + r = sd_bus_message_read(reply, "(tt)", + &n_current_transactions, + &n_total_transactions); + if (r < 0) + return bus_log_parse_error(r); + + printf("%sTransactions%s\n" + "Current Transactions: %" PRIu64 "\n" + " Total Transactions: %" PRIu64 "\n", + ansi_highlight(), + ansi_normal(), + n_current_transactions, + n_total_transactions); + + reply = sd_bus_message_unref(reply); + + r = sd_bus_get_property(bus, + "org.freedesktop.resolve1", + "/org/freedesktop/resolve1", + "org.freedesktop.resolve1.Manager", + "CacheStatistics", + &error, + &reply, + "(ttt)"); + if (r < 0) + return log_error_errno(r, "Failed to get cache statistics: %s", bus_error_message(&error, r)); + + r = sd_bus_message_read(reply, "(ttt)", + &cache_size, + &n_cache_hit, + &n_cache_miss); + if (r < 0) + return bus_log_parse_error(r); + + printf("\n%sCache%s\n" + " Current Cache Size: %" PRIu64 "\n" + " Cache Hits: %" PRIu64 "\n" + " Cache Misses: %" PRIu64 "\n", + ansi_highlight(), + ansi_normal(), + cache_size, + n_cache_hit, + n_cache_miss); + + reply = sd_bus_message_unref(reply); + + r = sd_bus_get_property(bus, + "org.freedesktop.resolve1", + "/org/freedesktop/resolve1", + "org.freedesktop.resolve1.Manager", + "DNSSECStatistics", + &error, + &reply, + "(tttt)"); + if (r < 0) + return log_error_errno(r, "Failed to get DNSSEC statistics: %s", bus_error_message(&error, r)); + + r = sd_bus_message_read(reply, "(tttt)", + &n_dnssec_secure, + &n_dnssec_insecure, + &n_dnssec_bogus, + &n_dnssec_indeterminate); + if (r < 0) + return bus_log_parse_error(r); + + printf("\n%sDNSSEC Verdicts%s\n" + " Secure: %" PRIu64 "\n" + " Insecure: %" PRIu64 "\n" + " Bogus: %" PRIu64 "\n" + " Indeterminate: %" PRIu64 "\n", + ansi_highlight(), + ansi_normal(), + n_dnssec_secure, + n_dnssec_insecure, + n_dnssec_bogus, + n_dnssec_indeterminate); + + return 0; +} + +static int reset_statistics(sd_bus *bus) { + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + int r; + + r = sd_bus_call_method(bus, + "org.freedesktop.resolve1", + "/org/freedesktop/resolve1", + "org.freedesktop.resolve1.Manager", + "ResetStatistics", + &error, + NULL, + NULL); + if (r < 0) + return log_error_errno(r, "Failed to reset statistics: %s", bus_error_message(&error, r)); + + return 0; +} + +static int flush_caches(sd_bus *bus) { + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + int r; + + r = sd_bus_call_method(bus, + "org.freedesktop.resolve1", + "/org/freedesktop/resolve1", + "org.freedesktop.resolve1.Manager", + "FlushCaches", + &error, + NULL, + NULL); + if (r < 0) + return log_error_errno(r, "Failed to flush caches: %s", bus_error_message(&error, r)); + + return 0; +} + +static int map_link_dns_servers(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) { + char ***l = userdata; + int r; + + assert(bus); + assert(member); + assert(m); + assert(l); + + r = sd_bus_message_enter_container(m, 'a', "(iay)"); + if (r < 0) + return r; + + for (;;) { + const void *a; + char *pretty; + int family; + size_t sz; + + r = sd_bus_message_enter_container(m, 'r', "iay"); + if (r < 0) + return r; + if (r == 0) + break; + + r = sd_bus_message_read(m, "i", &family); + if (r < 0) + return r; + + r = sd_bus_message_read_array(m, 'y', &a, &sz); + if (r < 0) + return r; + + r = sd_bus_message_exit_container(m); + if (r < 0) + return r; + + if (!IN_SET(family, AF_INET, AF_INET6)) { + log_debug("Unexpected family, ignoring."); + continue; + } + + if (sz != FAMILY_ADDRESS_SIZE(family)) { + log_debug("Address size mismatch, ignoring."); + continue; + } + + r = in_addr_to_string(family, a, &pretty); + if (r < 0) + return r; + + r = strv_consume(l, pretty); + if (r < 0) + return r; + } + + r = sd_bus_message_exit_container(m); + if (r < 0) + return r; + + return 0; +} + +static int map_link_domains(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) { + char ***l = userdata; + int r; + + assert(bus); + assert(member); + assert(m); + assert(l); + + r = sd_bus_message_enter_container(m, 'a', "(sb)"); + if (r < 0) + return r; + + for (;;) { + const char *domain; + int route_only; + char *pretty; + + r = sd_bus_message_read(m, "(sb)", &domain, &route_only); + if (r < 0) + return r; + if (r == 0) + break; + + if (route_only) + pretty = strappend("~", domain); + else + pretty = strdup(domain); + if (!pretty) + return -ENOMEM; + + r = strv_consume(l, pretty); + if (r < 0) + return r; + } + + r = sd_bus_message_exit_container(m); + if (r < 0) + return r; + + return 0; +} + +static int status_ifindex(sd_bus *bus, int ifindex, const char *name, bool *empty_line) { + + struct link_info { + uint64_t scopes_mask; + char *llmnr; + char *mdns; + char *dnssec; + char **dns; + char **domains; + char **ntas; + int dnssec_supported; + } link_info = {}; + + static const struct bus_properties_map property_map[] = { + { "ScopesMask", "t", NULL, offsetof(struct link_info, scopes_mask) }, + { "DNS", "a(iay)", map_link_dns_servers, offsetof(struct link_info, dns) }, + { "Domains", "a(sb)", map_link_domains, offsetof(struct link_info, domains) }, + { "LLMNR", "s", NULL, offsetof(struct link_info, llmnr) }, + { "MulticastDNS", "s", NULL, offsetof(struct link_info, mdns) }, + { "DNSSEC", "s", NULL, offsetof(struct link_info, dnssec) }, + { "DNSSECNegativeTrustAnchors", "as", NULL, offsetof(struct link_info, ntas) }, + { "DNSSECSupported", "b", NULL, offsetof(struct link_info, dnssec_supported) }, + {} + }; + + _cleanup_free_ char *ifi = NULL, *p = NULL; + char ifname[IF_NAMESIZE] = ""; + char **i; + int r; + + assert(bus); + assert(ifindex > 0); + assert(empty_line); + + if (!name) { + if (!if_indextoname(ifindex, ifname)) + return log_error_errno(errno, "Failed to resolve interface name for %i: %m", ifindex); + + name = ifname; + } + + if (asprintf(&ifi, "%i", ifindex) < 0) + return log_oom(); + + r = sd_bus_path_encode("/org/freedesktop/resolve1/link", ifi, &p); + if (r < 0) + return log_oom(); + + r = bus_map_all_properties(bus, + "org.freedesktop.resolve1", + p, + property_map, + &link_info); + if (r < 0) { + log_error_errno(r, "Failed to get link data for %i: %m", ifindex); + goto finish; + } + + pager_open(arg_no_pager, false); + + if (*empty_line) + fputc('\n', stdout); + + printf("%sLink %i (%s)%s\n", + ansi_highlight(), ifindex, name, ansi_normal()); + + if (link_info.scopes_mask == 0) + printf(" Current Scopes: none\n"); + else + printf(" Current Scopes:%s%s%s%s%s\n", + link_info.scopes_mask & SD_RESOLVED_DNS ? " DNS" : "", + link_info.scopes_mask & SD_RESOLVED_LLMNR_IPV4 ? " LLMNR/IPv4" : "", + link_info.scopes_mask & SD_RESOLVED_LLMNR_IPV6 ? " LLMNR/IPv6" : "", + link_info.scopes_mask & SD_RESOLVED_MDNS_IPV4 ? " mDNS/IPv4" : "", + link_info.scopes_mask & SD_RESOLVED_MDNS_IPV6 ? " mDNS/IPv6" : ""); + + printf(" LLMNR setting: %s\n" + "MulticastDNS setting: %s\n" + " DNSSEC setting: %s\n" + " DNSSEC supported: %s\n", + strna(link_info.llmnr), + strna(link_info.mdns), + strna(link_info.dnssec), + yes_no(link_info.dnssec_supported)); + + STRV_FOREACH(i, link_info.dns) { + printf(" %s %s\n", + i == link_info.dns ? "DNS Servers:" : " ", + *i); + } + + STRV_FOREACH(i, link_info.domains) { + printf(" %s %s\n", + i == link_info.domains ? "DNS Domain:" : " ", + *i); + } + + STRV_FOREACH(i, link_info.ntas) { + printf(" %s %s\n", + i == link_info.ntas ? "DNSSEC NTA:" : " ", + *i); + } + + *empty_line = true; + + r = 0; + +finish: + strv_free(link_info.dns); + strv_free(link_info.domains); + free(link_info.llmnr); + free(link_info.mdns); + free(link_info.dnssec); + strv_free(link_info.ntas); + return r; +} + +static int map_global_dns_servers(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) { + char ***l = userdata; + int r; + + assert(bus); + assert(member); + assert(m); + assert(l); + + r = sd_bus_message_enter_container(m, 'a', "(iiay)"); + if (r < 0) + return r; + + for (;;) { + const void *a; + char *pretty; + int family, ifindex; + size_t sz; + + r = sd_bus_message_enter_container(m, 'r', "iiay"); + if (r < 0) + return r; + if (r == 0) + break; + + r = sd_bus_message_read(m, "ii", &ifindex, &family); + if (r < 0) + return r; + + r = sd_bus_message_read_array(m, 'y', &a, &sz); + if (r < 0) + return r; + + r = sd_bus_message_exit_container(m); + if (r < 0) + return r; + + if (ifindex != 0) /* only show the global ones here */ + continue; + + if (!IN_SET(family, AF_INET, AF_INET6)) { + log_debug("Unexpected family, ignoring."); + continue; + } + + if (sz != FAMILY_ADDRESS_SIZE(family)) { + log_debug("Address size mismatch, ignoring."); + continue; + } + + r = in_addr_to_string(family, a, &pretty); + if (r < 0) + return r; + + r = strv_consume(l, pretty); + if (r < 0) + return r; + } + + r = sd_bus_message_exit_container(m); + if (r < 0) + return r; + + return 0; +} + +static int map_global_domains(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) { + char ***l = userdata; + int r; + + assert(bus); + assert(member); + assert(m); + assert(l); + + r = sd_bus_message_enter_container(m, 'a', "(isb)"); + if (r < 0) + return r; + + for (;;) { + const char *domain; + int route_only, ifindex; + char *pretty; + + r = sd_bus_message_read(m, "(isb)", &ifindex, &domain, &route_only); + if (r < 0) + return r; + if (r == 0) + break; + + if (ifindex != 0) /* only show the global ones here */ + continue; + + if (route_only) + pretty = strappend("~", domain); + else + pretty = strdup(domain); + if (!pretty) + return -ENOMEM; + + r = strv_consume(l, pretty); + if (r < 0) + return r; + } + + r = sd_bus_message_exit_container(m); + if (r < 0) + return r; + + return 0; +} + +static int status_global(sd_bus *bus, bool *empty_line) { + + struct global_info { + char **dns; + char **domains; + char **ntas; + } global_info = {}; + + static const struct bus_properties_map property_map[] = { + { "DNS", "a(iiay)", map_global_dns_servers, offsetof(struct global_info, dns) }, + { "Domains", "a(isb)", map_global_domains, offsetof(struct global_info, domains) }, + { "DNSSECNegativeTrustAnchors", "as", NULL, offsetof(struct global_info, ntas) }, + {} + }; + + char **i; + int r; + + assert(bus); + assert(empty_line); + + r = bus_map_all_properties(bus, + "org.freedesktop.resolve1", + "/org/freedesktop/resolve1", + property_map, + &global_info); + if (r < 0) { + log_error_errno(r, "Failed to get global data: %m"); + goto finish; + } + + if (strv_isempty(global_info.dns) && strv_isempty(global_info.domains) && strv_isempty(global_info.ntas)) { + r = 0; + goto finish; + } + + pager_open(arg_no_pager, false); + + printf("%sGlobal%s\n", ansi_highlight(), ansi_normal()); + STRV_FOREACH(i, global_info.dns) { + printf(" %s %s\n", + i == global_info.dns ? "DNS Servers:" : " ", + *i); + } + + STRV_FOREACH(i, global_info.domains) { + printf(" %s %s\n", + i == global_info.domains ? "DNS Domain:" : " ", + *i); + } + + strv_sort(global_info.ntas); + STRV_FOREACH(i, global_info.ntas) { + printf(" %s %s\n", + i == global_info.ntas ? "DNSSEC NTA:" : " ", + *i); + } + + *empty_line = true; + + r = 0; + +finish: + strv_free(global_info.dns); + strv_free(global_info.domains); + strv_free(global_info.ntas); + + return r; +} + +static int status_all(sd_bus *bus) { + _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL; + _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; + sd_netlink_message *i; + bool empty_line = false; + int r; + + assert(bus); + + r = status_global(bus, &empty_line); + if (r < 0) + return r; + + r = sd_netlink_open(&rtnl); + if (r < 0) + return log_error_errno(r, "Failed to connect to netlink: %m"); + + r = sd_rtnl_message_new_link(rtnl, &req, RTM_GETLINK, 0); + if (r < 0) + return rtnl_log_create_error(r); + + r = sd_netlink_message_request_dump(req, true); + if (r < 0) + return rtnl_log_create_error(r); + + r = sd_netlink_call(rtnl, req, 0, &reply); + if (r < 0) + return log_error_errno(r, "Failed to enumerate links: %m"); + + r = 0; + for (i = reply; i; i = sd_netlink_message_next(i)) { + const char *name; + int ifindex, q; + uint16_t type; + + q = sd_netlink_message_get_type(i, &type); + if (q < 0) + return rtnl_log_parse_error(q); + + if (type != RTM_NEWLINK) + continue; + + q = sd_rtnl_message_link_get_ifindex(i, &ifindex); + if (q < 0) + return rtnl_log_parse_error(q); + + if (ifindex == LOOPBACK_IFINDEX) + continue; + + q = sd_netlink_message_read_string(i, IFLA_IFNAME, &name); + if (q < 0) + return rtnl_log_parse_error(q); + + q = status_ifindex(bus, ifindex, name, &empty_line); + if (q < 0 && r >= 0) + r = q; + } + + return r; +} + +static void help_protocol_types(void) { + if (arg_legend) + puts("Known protocol types:"); + puts("dns\nllmnr\nllmnr-ipv4\nllmnr-ipv6"); +} + +static void help_dns_types(void) { + const char *t; + int i; + + if (arg_legend) + puts("Known DNS RR types:"); + for (i = 0; i < _DNS_TYPE_MAX; i++) { + t = dns_type_to_string(i); + if (t) + puts(t); + } +} + +static void help_dns_classes(void) { + const char *t; + int i; + + if (arg_legend) + puts("Known DNS RR classes:"); + for (i = 0; i < _DNS_CLASS_MAX; i++) { + t = dns_class_to_string(i); + if (t) + puts(t); + } +} + +static void help(void) { + printf("%1$s [OPTIONS...] HOSTNAME|ADDRESS...\n" + "%1$s [OPTIONS...] --service [[NAME] TYPE] DOMAIN\n" + "%1$s [OPTIONS...] --openpgp EMAIL@DOMAIN...\n" + "%1$s [OPTIONS...] --statistics\n" + "%1$s [OPTIONS...] --reset-statistics\n" + "\n" + "Resolve domain names, IPv4 and IPv6 addresses, DNS resource records, and services.\n\n" + " -h --help Show this help\n" + " --version Show package version\n" + " --no-pager Do not pipe output into a pager\n" + " -4 Resolve IPv4 addresses\n" + " -6 Resolve IPv6 addresses\n" + " -i --interface=INTERFACE Look on interface\n" + " -p --protocol=PROTO|help Look via protocol\n" + " -t --type=TYPE|help Query RR with DNS type\n" + " -c --class=CLASS|help Query RR with DNS class\n" + " --service Resolve service (SRV)\n" + " --service-address=BOOL Resolve address for services (default: yes)\n" + " --service-txt=BOOL Resolve TXT records for services (default: yes)\n" + " --openpgp Query OpenPGP public key\n" + " --tlsa Query TLS public key\n" + " --cname=BOOL Follow CNAME redirects (default: yes)\n" + " --search=BOOL Use search domains for single-label names\n" + " (default: yes)\n" + " --raw[=payload|packet] Dump the answer as binary data\n" + " --legend=BOOL Print headers and additional info (default: yes)\n" + " --statistics Show resolver statistics\n" + " --reset-statistics Reset resolver statistics\n" + " --status Show link and server status\n" + " --flush-caches Flush all local DNS caches\n" + , program_invocation_short_name); +} + +static int parse_argv(int argc, char *argv[]) { + enum { + ARG_VERSION = 0x100, + ARG_LEGEND, + ARG_SERVICE, + ARG_CNAME, + ARG_SERVICE_ADDRESS, + ARG_SERVICE_TXT, + ARG_OPENPGP, + ARG_TLSA, + ARG_RAW, + ARG_SEARCH, + ARG_STATISTICS, + ARG_RESET_STATISTICS, + ARG_STATUS, + ARG_FLUSH_CACHES, + ARG_NO_PAGER, + }; + + static const struct option options[] = { + { "help", no_argument, NULL, 'h' }, + { "version", no_argument, NULL, ARG_VERSION }, + { "type", required_argument, NULL, 't' }, + { "class", required_argument, NULL, 'c' }, + { "legend", required_argument, NULL, ARG_LEGEND }, + { "interface", required_argument, NULL, 'i' }, + { "protocol", required_argument, NULL, 'p' }, + { "cname", required_argument, NULL, ARG_CNAME }, + { "service", no_argument, NULL, ARG_SERVICE }, + { "service-address", required_argument, NULL, ARG_SERVICE_ADDRESS }, + { "service-txt", required_argument, NULL, ARG_SERVICE_TXT }, + { "openpgp", no_argument, NULL, ARG_OPENPGP }, + { "tlsa", optional_argument, NULL, ARG_TLSA }, + { "raw", optional_argument, NULL, ARG_RAW }, + { "search", required_argument, NULL, ARG_SEARCH }, + { "statistics", no_argument, NULL, ARG_STATISTICS, }, + { "reset-statistics", no_argument, NULL, ARG_RESET_STATISTICS }, + { "status", no_argument, NULL, ARG_STATUS }, + { "flush-caches", no_argument, NULL, ARG_FLUSH_CACHES }, + { "no-pager", no_argument, NULL, ARG_NO_PAGER }, + {} + }; + + int c, r; + + assert(argc >= 0); + assert(argv); + + while ((c = getopt_long(argc, argv, "h46i:t:c:p:", options, NULL)) >= 0) + switch(c) { + + case 'h': + help(); + return 0; /* done */; + + case ARG_VERSION: + return version(); + + case '4': + arg_family = AF_INET; + break; + + case '6': + arg_family = AF_INET6; + break; + + case 'i': { + int ifi; + + if (parse_ifindex(optarg, &ifi) >= 0) + arg_ifindex = ifi; + else { + ifi = if_nametoindex(optarg); + if (ifi <= 0) + return log_error_errno(errno, "Unknown interface %s: %m", optarg); + + arg_ifindex = ifi; + } + + break; + } + + case 't': + if (streq(optarg, "help")) { + help_dns_types(); + return 0; + } + + r = dns_type_from_string(optarg); + if (r < 0) { + log_error("Failed to parse RR record type %s", optarg); + return r; + } + arg_type = (uint16_t) r; + assert((int) arg_type == r); + + arg_mode = MODE_RESOLVE_RECORD; + break; + + case 'c': + if (streq(optarg, "help")) { + help_dns_classes(); + return 0; + } + + r = dns_class_from_string(optarg); + if (r < 0) { + log_error("Failed to parse RR record class %s", optarg); + return r; + } + arg_class = (uint16_t) r; + assert((int) arg_class == r); + + break; + + case ARG_LEGEND: + r = parse_boolean(optarg); + if (r < 0) + return log_error_errno(r, "Failed to parse --legend= argument"); + + arg_legend = r; + break; + + case 'p': + if (streq(optarg, "help")) { + help_protocol_types(); + return 0; + } else if (streq(optarg, "dns")) + arg_flags |= SD_RESOLVED_DNS; + else if (streq(optarg, "llmnr")) + arg_flags |= SD_RESOLVED_LLMNR; + else if (streq(optarg, "llmnr-ipv4")) + arg_flags |= SD_RESOLVED_LLMNR_IPV4; + else if (streq(optarg, "llmnr-ipv6")) + arg_flags |= SD_RESOLVED_LLMNR_IPV6; + else { + log_error("Unknown protocol specifier: %s", optarg); + return -EINVAL; + } + + break; + + case ARG_SERVICE: + arg_mode = MODE_RESOLVE_SERVICE; + break; + + case ARG_OPENPGP: + arg_mode = MODE_RESOLVE_OPENPGP; + break; + + case ARG_TLSA: + arg_mode = MODE_RESOLVE_TLSA; + arg_service_family = service_family_from_string(optarg); + if (arg_service_family < 0) { + log_error("Unknown service family \"%s\".", optarg); + return -EINVAL; + } + break; + + case ARG_RAW: + if (on_tty()) { + log_error("Refusing to write binary data to tty."); + return -ENOTTY; + } + + if (optarg == NULL || streq(optarg, "payload")) + arg_raw = RAW_PAYLOAD; + else if (streq(optarg, "packet")) + arg_raw = RAW_PACKET; + else { + log_error("Unknown --raw specifier \"%s\".", optarg); + return -EINVAL; + } + + arg_legend = false; + break; + + case ARG_CNAME: + r = parse_boolean(optarg); + if (r < 0) + return log_error_errno(r, "Failed to parse --cname= argument."); + SET_FLAG(arg_flags, SD_RESOLVED_NO_CNAME, r == 0); + break; + + case ARG_SERVICE_ADDRESS: + r = parse_boolean(optarg); + if (r < 0) + return log_error_errno(r, "Failed to parse --service-address= argument."); + SET_FLAG(arg_flags, SD_RESOLVED_NO_ADDRESS, r == 0); + break; + + case ARG_SERVICE_TXT: + r = parse_boolean(optarg); + if (r < 0) + return log_error_errno(r, "Failed to parse --service-txt= argument."); + SET_FLAG(arg_flags, SD_RESOLVED_NO_TXT, r == 0); + break; + + case ARG_SEARCH: + r = parse_boolean(optarg); + if (r < 0) + return log_error_errno(r, "Failed to parse --search argument."); + SET_FLAG(arg_flags, SD_RESOLVED_NO_SEARCH, r == 0); + break; + + case ARG_STATISTICS: + arg_mode = MODE_STATISTICS; + break; + + case ARG_RESET_STATISTICS: + arg_mode = MODE_RESET_STATISTICS; + break; + + case ARG_FLUSH_CACHES: + arg_mode = MODE_FLUSH_CACHES; + break; + + case ARG_STATUS: + arg_mode = MODE_STATUS; + break; + + case ARG_NO_PAGER: + arg_no_pager = true; + break; + + case '?': + return -EINVAL; + + default: + assert_not_reached("Unhandled option"); + } + + if (arg_type == 0 && arg_class != 0) { + log_error("--class= may only be used in conjunction with --type=."); + return -EINVAL; + } + + if (arg_type != 0 && arg_mode == MODE_RESOLVE_SERVICE) { + log_error("--service and --type= may not be combined."); + return -EINVAL; + } + + if (arg_type != 0 && arg_class == 0) + arg_class = DNS_CLASS_IN; + + if (arg_class != 0 && arg_type == 0) + arg_type = DNS_TYPE_A; + + return 1 /* work to do */; +} + +int main(int argc, char **argv) { + _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; + int r; + + log_parse_environment(); + log_open(); + + r = parse_argv(argc, argv); + if (r <= 0) + goto finish; + + r = sd_bus_open_system(&bus); + if (r < 0) { + log_error_errno(r, "sd_bus_open_system: %m"); + goto finish; + } + + switch (arg_mode) { + + case MODE_RESOLVE_HOST: + if (optind >= argc) { + log_error("No arguments passed."); + r = -EINVAL; + goto finish; + } + + while (argv[optind]) { + int family, ifindex, k; + union in_addr_union a; + + if (startswith(argv[optind], "dns:")) + k = resolve_rfc4501(bus, argv[optind]); + else { + k = in_addr_ifindex_from_string_auto(argv[optind], &family, &a, &ifindex); + if (k >= 0) + k = resolve_address(bus, family, &a, ifindex); + else + k = resolve_host(bus, argv[optind]); + } + + if (r == 0) + r = k; + + optind++; + } + break; + + case MODE_RESOLVE_RECORD: + if (optind >= argc) { + log_error("No arguments passed."); + r = -EINVAL; + goto finish; + } + + while (argv[optind]) { + int k; + + k = resolve_record(bus, argv[optind], arg_class, arg_type); + if (r == 0) + r = k; + + optind++; + } + break; + + case MODE_RESOLVE_SERVICE: + if (argc < optind + 1) { + log_error("Domain specification required."); + r = -EINVAL; + goto finish; + + } else if (argc == optind + 1) + r = resolve_service(bus, NULL, NULL, argv[optind]); + else if (argc == optind + 2) + r = resolve_service(bus, NULL, argv[optind], argv[optind+1]); + else if (argc == optind + 3) + r = resolve_service(bus, argv[optind], argv[optind+1], argv[optind+2]); + else { + log_error("Too many arguments."); + r = -EINVAL; + goto finish; + } + + break; + + case MODE_RESOLVE_OPENPGP: + if (argc < optind + 1) { + log_error("E-mail address required."); + r = -EINVAL; + goto finish; + + } + + r = 0; + while (optind < argc) { + int k; + + k = resolve_openpgp(bus, argv[optind++]); + if (k < 0) + r = k; + } + break; + + case MODE_RESOLVE_TLSA: + if (argc < optind + 1) { + log_error("Domain name required."); + r = -EINVAL; + goto finish; + + } + + r = 0; + while (optind < argc) { + int k; + + k = resolve_tlsa(bus, argv[optind++]); + if (k < 0) + r = k; + } + break; + + case MODE_STATISTICS: + if (argc > optind) { + log_error("Too many arguments."); + r = -EINVAL; + goto finish; + } + + r = show_statistics(bus); + break; + + case MODE_RESET_STATISTICS: + if (argc > optind) { + log_error("Too many arguments."); + r = -EINVAL; + goto finish; + } + + r = reset_statistics(bus); + break; + + case MODE_FLUSH_CACHES: + if (argc > optind) { + log_error("Too many arguments."); + r = -EINVAL; + goto finish; + } + + r = flush_caches(bus); + break; + + case MODE_STATUS: + + if (argc > optind) { + char **ifname; + bool empty_line = false; + + r = 0; + STRV_FOREACH(ifname, argv + optind) { + int ifindex, q; + + q = parse_ifindex(argv[optind], &ifindex); + if (q < 0) { + ifindex = if_nametoindex(argv[optind]); + if (ifindex <= 0) { + log_error_errno(errno, "Failed to resolve interface name: %s", argv[optind]); + continue; + } + } + + q = status_ifindex(bus, ifindex, NULL, &empty_line); + if (q < 0 && r >= 0) + r = q; + } + } else + r = status_all(bus); + + break; + } + +finish: + pager_close(); + + return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE; +} diff --git a/src/grp-resolve/systemd-resolve/systemd-resolve.completion.bash b/src/grp-resolve/systemd-resolve/systemd-resolve.completion.bash new file mode 100644 index 0000000000..0c501c9405 --- /dev/null +++ b/src/grp-resolve/systemd-resolve/systemd-resolve.completion.bash @@ -0,0 +1,64 @@ +# systemd-resolve(1) completion -*- shell-script -*- +# +# This file is part of systemd. +# +# Copyright 2016 Zbigniew Jędrzejewski-Szmek +# +# systemd is free software; you can redistribute it and/or modify it +# under the terms of the GNU Lesser General Public License as published by +# the Free Software Foundation; either version 2.1 of the License, or +# (at your option) any later version. +# +# systemd is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public License +# along with systemd; If not, see <http://www.gnu.org/licenses/>. + +__contains_word () { + local w word=$1; shift + for w in "$@"; do + [[ $w = "$word" ]] && return + done +} + +__get_interfaces(){ + { cd /sys/class/net && echo *; } | \ + while read -d' ' -r name; do + [[ "$name" != "lo" ]] && echo "$name" + done +} + +_systemd-resolve() { + local i comps + local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]} + local -A OPTS=( + [STANDALONE]='-h --help --version -4 -6 + --service --openpgp --tlsa --statistics --reset-statistics + --service-address=no --service-txt=no + --cname=no --search=no --legend=no' + [ARG]='-i --interface -p --protocol -t --type -c --class' + ) + + if __contains_word "$prev" ${OPTS[ARG]}; then + case $prev in + --interface|-i) + comps=$( __get_interfaces ) + ;; + --protocol|-p|--type|-t|--class|-c) + comps=$( systemd-resolve --legend=no "$prev" help; echo help ) + ;; + esac + COMPREPLY=( $(compgen -W '$comps' -- "$cur") ) + return 0 + fi + + if [[ "$cur" = -* ]]; then + COMPREPLY=( $(compgen -W '${OPTS[*]}' -- "$cur") ) + return 0 + fi +} + +complete -F _systemd-resolve systemd-resolve diff --git a/src/grp-resolve/systemd-resolve/systemd-resolve.completion.zsh b/src/grp-resolve/systemd-resolve/systemd-resolve.completion.zsh new file mode 100644 index 0000000000..c318ab50f1 --- /dev/null +++ b/src/grp-resolve/systemd-resolve/systemd-resolve.completion.zsh @@ -0,0 +1,64 @@ +#compdef systemd-resolve + +# +# This file is part of systemd. +# +# Copyright 2016 Zbigniew Jędrzejewski-Szmek +# +# systemd is free software; you can redistribute it and/or modify it +# under the terms of the GNU Lesser General Public License as published by +# the Free Software Foundation; either version 2.1 of the License, or +# (at your option) any later version. +# +# systemd is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public License +# along with systemd; If not, see <http://www.gnu.org/licenses/>. + +_dns_protocol() { + local -a _protocol + _protocol=( $(_call_program protocol ${service} --legend=no --protocol help; echo help) ) + _values 'protocol' "$_protocol[@]" +} + +_dns_type() { + local -a _type + _type=( $(_call_program type ${service} --legend=no --type help; echo help) ) + _values 'type' "$_type[@]" +} + +_dns_class() { + local -a _class + _class=( $(_call_program class ${service} --legend=no --class help; echo help) ) + _values 'class' "$_class[@]" +} + +_systemd-resolve_none() { + _alternative : \ + 'domain:DNS address:' \ + 'address:email address:' +} + +_arguments \ + {-h,--help}'[Print a short help text and exit]' \ + '--version[Print a short version string and exit]' \ + '--legend=no[Do not show headers and footers]' \ + '-4[Resolve IPv4 addresses]' \ + '-6[Resolve IPv6 addresses]' \ + {-i+,--interface=}'[Look on interface]:interface:_net_interfaces' \ + {-p+,--protocol=}'[Look via protocol]:protocol:_dns_protocol' \ + {-t+,--type=}'[Query RR with DNS type]:type:_dns_type' \ + {-c+,--class=}'[Query RR with DNS class]:class:_dns_class' \ + '--service[Resolve services]' \ + '--service-address=no[Do not resolve address for services]' \ + '--service-txt=no[Do not resolve TXT records for services]' \ + '--openpgp[Query OpenPGP public key]' \ + '--tlsa[Query TLS public key]' \ + '--cname=no[Do not follow CNAME redirects]' \ + '--search=no[Do not use search domains]' \ + '--statistics[Show resolver statistics]' \ + '--reset-statistics[Reset resolver statistics]' \ + '*::default: _systemd-resolve_none' diff --git a/src/grp-resolve/systemd-resolve/systemd-resolve.xml b/src/grp-resolve/systemd-resolve/systemd-resolve.xml new file mode 100644 index 0000000000..ca26bb4d49 --- /dev/null +++ b/src/grp-resolve/systemd-resolve/systemd-resolve.xml @@ -0,0 +1,394 @@ +<?xml version='1.0'?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" +"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + +<!-- + This file is part of systemd. + + Copyright 2016 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +--> + +<refentry id="systemd-resolve" + xmlns:xi="http://www.w3.org/2001/XInclude"> + + <refentryinfo> + <title>systemd-resolve</title> + <productname>systemd</productname> + + <authorgroup> + <author> + <contrib>Developer</contrib> + <firstname>Lennart</firstname> + <surname>Poettering</surname> + <email>lennart@poettering.net</email> + </author> + </authorgroup> + </refentryinfo> + + <refmeta> + <refentrytitle>systemd-resolve</refentrytitle> + <manvolnum>1</manvolnum> + </refmeta> + + <refnamediv> + <refname>systemd-resolve</refname> + <refpurpose>Resolve domain names, IPV4 and IPv6 addresses, DNS resource records, and services</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis> + <command>systemd-resolve</command> + <arg choice="opt" rep="repeat">OPTIONS</arg> + <arg choice="plain" rep="repeat"><replaceable>HOSTNAME</replaceable></arg> + </cmdsynopsis> + + <cmdsynopsis> + <command>systemd-resolve</command> + <arg choice="opt" rep="repeat">OPTIONS</arg> + <arg choice="plain" rep="repeat"><replaceable>ADDRESS</replaceable></arg> + </cmdsynopsis> + + <cmdsynopsis> + <command>systemd-resolve</command> + <arg choice="opt" rep="repeat">OPTIONS</arg> + <command> --type=<replaceable>TYPE</replaceable></command> + <arg choice="plain" rep="repeat"><replaceable>DOMAIN</replaceable></arg> + </cmdsynopsis> + + <cmdsynopsis> + <command>systemd-resolve</command> + <arg choice="opt" rep="repeat">OPTIONS</arg> + <command> --service</command> + <arg choice="plain"><arg choice="opt"><arg choice="opt"><replaceable>NAME</replaceable></arg> + <replaceable>TYPE</replaceable></arg> <replaceable>DOMAIN</replaceable></arg> + </cmdsynopsis> + + <cmdsynopsis> + <command>systemd-resolve</command> + <arg choice="opt" rep="repeat">OPTIONS</arg> + <command> --openpgp</command> + <arg choice="plain"><replaceable>USER@DOMAIN</replaceable></arg> + </cmdsynopsis> + + <cmdsynopsis> + <command>systemd-resolve</command> + <arg choice="opt" rep="repeat">OPTIONS</arg> + <command> --tlsa</command> + <arg choice="plain"><replaceable>DOMAIN<optional>:PORT</optional></replaceable></arg> + </cmdsynopsis> + + <cmdsynopsis> + <command>systemd-resolve</command> + <arg choice="opt" rep="repeat">OPTIONS</arg> + <command> --statistics</command> + </cmdsynopsis> + + <cmdsynopsis> + <command>systemd-resolve</command> + <arg choice="opt" rep="repeat">OPTIONS</arg> + <command> --reset-statistics</command> + </cmdsynopsis> + + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><command>systemd-resolve</command> may be used to resolve domain names, IPv4 and IPv6 addresses, DNS resource + records and services with the + <citerefentry><refentrytitle>systemd-resolved.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> + resolver service. By default, the specified list of parameters will be resolved as hostnames, retrieving their IPv4 + and IPv6 addresses. If the parameters specified are formatted as IPv4 or IPv6 operation the reverse operation is + done, and a hostname is retrieved for the specified addresses.</para> + + <para>The program's output contains information about the protocol used for the look-up and on which network + interface the data was discovered. It also contains information on whether the information could be + authenticated. All data for which local DNSSEC validation succeeds is considered authenticated. Moreover all data + originating from local, trusted sources is also reported authenticated, including resolution of the local host + name, the <literal>localhost</literal> host name or all data from <filename>/etc/hosts</filename>.</para> + + <para>The <option>--type=</option> switch may be used to specify a DNS resource record type (A, AAAA, SOA, MX, ...) in + order to request a specific DNS resource record, instead of the address or reverse address lookups. + The special value <literal>help</literal> may be used to list known values.</para> + + <para>The <option>--service</option> switch may be used to resolve <ulink + url="https://tools.ietf.org/html/rfc2782">SRV</ulink> and <ulink + url="https://tools.ietf.org/html/rfc6763">DNS-SD</ulink> services (see below). In this mode, between one and three + arguments are required. If three parameters are passed the first is assumed to be the DNS-SD service name, the + second the SRV service type, and the third the domain to search in. In this case a full DNS-SD style SRV and TXT + lookup is executed. If only two parameters are specified, the first is assumed to be the SRV service type, and the + second the domain to look in. In this case no TXT RR is requested. Finally, if only one parameter is specified, it + is assumed to be a domain name, that is already prefixed with an SRV type, and an SRV lookup is done (no + TXT).</para> + + <para>The <option>--openpgp</option> switch may be used to query PGP keys stored as + <ulink url="https://tools.ietf.org/html/draft-wouters-dane-openpgp-02">OPENPGPKEY</ulink> resource records. + When this option is specified one or more e-mail address must be specified.</para> + + <para>The <option>--tlsa</option> switch maybe be used to query TLS public + keys stored as + <ulink url="https://tools.ietf.org/html/rfc6698">TLSA</ulink> resource records. + When this option is specified one or more domain names must be specified.</para> + + <para>The <option>--statistics</option> switch may be used to show resolver statistics, including information about + the number of successful and failed DNSSEC validations.</para> + + <para>The <option>--reset-statistics</option> may be used to reset various statistics counters maintained the + resolver, including those shown in the <option>--statistics</option> output. This operation requires root + privileges.</para> + </refsect1> + + <refsect1> + <title>Options</title> + <variablelist> + <varlistentry> + <term><option>-4</option></term> + <term><option>-6</option></term> + + <listitem><para>By default, when resolving a hostname, both IPv4 and IPv6 + addresses are acquired. By specifying <option>-4</option> only IPv4 addresses are requested, by specifying + <option>-6</option> only IPv6 addresses are requested.</para> + </listitem> + </varlistentry> + + <varlistentry> + <term><option>-i</option> <replaceable>INTERFACE</replaceable></term> + <term><option>--interface=</option><replaceable>INTERFACE</replaceable></term> + + <listitem><para>Specifies the network interface to execute the query on. This may either be specified as numeric + interface index or as network interface string (e.g. <literal>en0</literal>). Note that this option has no + effect if system-wide DNS configuration (as configured in <filename>/etc/resolv.conf</filename> or + <filename>/etc/systemd/resolve.conf</filename>) in place of per-link configuration is used.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>-p</option> <replaceable>PROTOCOL</replaceable></term> + <term><option>--protocol=</option><replaceable>PROTOCOL</replaceable></term> + + <listitem><para>Specifies the network protocol for the query. May be one of <literal>dns</literal> + (i.e. classic unicast DNS), <literal>llmnr</literal> (<ulink + url="https://tools.ietf.org/html/rfc4795">Link-Local Multicast Name Resolution</ulink>), + <literal>llmnr-ipv4</literal>, <literal>llmnr-ipv6</literal> (LLMNR via the indicated underlying IP + protocols). By default the lookup is done via all protocols suitable for the lookup. If used, limits the set of + protocols that may be used. Use this option multiple times to enable resolving via multiple protocols at the + same time. The setting <literal>llmnr</literal> is identical to specifying this switch once with + <literal>llmnr-ipv4</literal> and once via <literal>llmnr-ipv6</literal>. Note that this option does not force + the service to resolve the operation with the specified protocol, as that might require a suitable network + interface and configuration. + The special value <literal>help</literal> may be used to list known values. + </para></listitem> + </varlistentry> + + <varlistentry> + <term><option>-t</option> <replaceable>TYPE</replaceable></term> + <term><option>--type=</option><replaceable>TYPE</replaceable></term> + <term><option>-c</option> <replaceable>CLASS</replaceable></term> + <term><option>--class=</option><replaceable>CLASS</replaceable></term> + + <listitem><para>Specifies the DNS resource record type (e.g. A, AAAA, MX, …) and class (e.g. IN, ANY, …) to + look up. If these options are used a DNS resource record set matching the specified class and type is + requested. The class defaults to IN if only a type is specified. + The special value <literal>help</literal> may be used to list known values. + </para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--service</option></term> + + <listitem><para>Enables service resolution. This enables DNS-SD and simple SRV service resolution, depending + on the specified list of parameters (see above).</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--service-address=</option><replaceable>BOOL</replaceable></term> + + <listitem><para>Takes a boolean parameter. If true (the default), when doing a service lookup with + <option>--service</option> the hostnames contained in the SRV resource records are resolved as well.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--service-txt=</option><replaceable>BOOL</replaceable></term> + + <listitem><para>Takes a boolean parameter. If true (the default), when doing a DNS-SD service lookup with + <option>--service</option> the TXT service metadata record is resolved as well.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--openpgp</option></term> + + <listitem><para>Enables OPENPGPKEY resource record resolution (see above). Specified e-mail + addresses are converted to the corresponding DNS domain name, and any OPENPGPKEY keys are + printed.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--tlsa</option></term> + + <listitem><para>Enables TLSA resource record resolution (see above). + A query will be performed for each of the specified names prefixed with + the port and family + (<literal>_<replaceable>port</replaceable>._<replaceable>family</replaceable>.<replaceable>domain</replaceable></literal>). + The port number may be specified after a colon + (<literal>:</literal>), otherwise <constant>443</constant> will be used + by default. The family may be specified as an argument after + <option>--tlsa</option>, otherwise <constant>tcp</constant> will be + used.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--cname=</option><replaceable>BOOL</replaceable></term> + + <listitem><para>Takes a boolean parameter. If true (the default), DNS CNAME or DNAME redirections are + followed. Otherwise, if a CNAME or DNAME record is encountered while resolving, an error is + returned.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--search=</option><replaceable>BOOL</replaceable></term> + + <listitem><para>Takes a boolean parameter. If true (the default), any specified single-label hostnames will be + searched in the domains configured in the search domain list, if it is non-empty. Otherwise, the search domain + logic is disabled.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--raw</option><optional>=payload|packet</optional></term> + + <listitem><para>Dump the answer as binary data. If there is no argument or if the argument is + <literal>payload</literal>, the payload of the packet is exported. If the argument is + <literal>packet</literal>, the whole packet is dumped in wire format, prefixed by + length specified as a little-endian 64-bit number. This format allows multiple packets + to be dumped and unambigously parsed.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--legend=</option><replaceable>BOOL</replaceable></term> + + <listitem><para>Takes a boolean parameter. If true (the default), column headers and meta information about the + query response are shown. Otherwise, this output is suppressed.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--statistics</option></term> + + <listitem><para>If specified general resolver statistics are shown, including information whether DNSSEC is + enabled and available, as well as resolution and validation statistics.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--reset-statistics</option></term> + + <listitem><para>Resets the statistics counters shown in <option>--statistics</option> to zero.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--flush-caches</option></term> + + <listitem><para>Flushes all DNS resource record caches the service maintains locally.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--status</option></term> + + <listitem><para>Shows the global and per-link DNS settings in currently in effect.</para></listitem> + </varlistentry> + + <xi:include href="standard-options.xml" xpointer="help" /> + <xi:include href="standard-options.xml" xpointer="version" /> + <xi:include href="standard-options.xml" xpointer="no-pager" /> + </variablelist> + </refsect1> + + <refsect1> + <title>Examples</title> + + <example> + <title>Retrieve the addresses of the <literal>www.0pointer.net</literal> domain</title> + + <programlisting>$ systemd-resolve www.0pointer.net +www.0pointer.net: 2a01:238:43ed:c300:10c3:bcf3:3266:da74 + 85.214.157.71 + +-- Information acquired via protocol DNS in 611.6ms. +-- Data is authenticated: no +</programlisting> + </example> + + <example> + <title>Retrieve the domain of the <literal>85.214.157.71</literal> IP address</title> + + <programlisting>$ systemd-resolve 85.214.157.71 +85.214.157.71: gardel.0pointer.net + +-- Information acquired via protocol DNS in 1.2997s. +-- Data is authenticated: no +</programlisting> + </example> + + <example> + <title>Retrieve the MX record of the <literal>0pointer.net</literal> domain</title> + + <programlisting>$ systemd-resolve -t MX yahoo.com --legend=no +yahoo.com. IN MX 1 mta7.am0.yahoodns.net +yahoo.com. IN MX 1 mta6.am0.yahoodns.net +yahoo.com. IN MX 1 mta5.am0.yahoodns.net +</programlisting> + </example> + + <example> + <title>Resolve an SRV service</title> + + <programlisting>$ systemd-resolve --service _xmpp-server._tcp gmail.com +_xmpp-server._tcp/gmail.com: alt1.xmpp-server.l.google.com:5269 [priority=20, weight=0] + 173.194.210.125 + alt4.xmpp-server.l.google.com:5269 [priority=20, weight=0] + 173.194.65.125 + ... +</programlisting> + </example> + + <example> + <title>Retrieve a PGP key</title> + + <programlisting>$ systemd-resolve --openpgp zbyszek@fedoraproject.org +d08ee310438ca124a6149ea5cc21b6313b390dce485576eff96f8722._openpgpkey.fedoraproject.org. IN OPENPGPKEY + mQINBFBHPMsBEACeInGYJCb+7TurKfb6wGyTottCDtiSJB310i37/6ZYoeIay/5soJjlMyf + MFQ9T2XNT/0LM6gTa0MpC1st9LnzYTMsT6tzRly1D1UbVI6xw0g0vE5y2Cjk3xUwAynCsSs + ... +</programlisting> + </example> + + <example> + <title>Retrieve a TLS key (<literal>=tcp</literal> and + <literal>:443</literal> could be skipped)</title> + + <programlisting>$ systemd-resolve --tlsa=tcp fedoraproject.org:443 +_443._tcp.fedoraproject.org IN TLSA 0 0 1 19400be5b7a31fb733917700789d2f0a2471c0c9d506c0e504c06c16d7cb17c0 + -- Cert. usage: CA constraint + -- Selector: Full Certificate + -- Matching type: SHA-256 +</programlisting> + </example> + </refsect1> + + <refsect1> + <title>See Also</title> + <para> + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd-resolved.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> + </para> + </refsect1> +</refentry> |