-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- 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 <net/if.h>
-#include <getopt.h>
-
-#include "sd-bus.h"
-#include "bus-util.h"
-#include "bus-error.h"
-#include "in-addr-util.h"
-#include "af-list.h"
-#include "build.h"
-
-#include "resolved-dns-packet.h"
-#include "resolved-def.h"
-
-#define DNS_CALL_TIMEOUT_USEC (45*USEC_PER_SEC)
-
-static int arg_family = AF_UNSPEC;
-static int arg_ifindex = 0;
-static int arg_type = 0;
-static uint16_t arg_class = 0;
-static bool arg_legend = true;
-static uint64_t arg_flags = 0;
-
-static void print_source(int ifindex, uint64_t flags) {
-
- if (!arg_legend)
- return;
-
- if (ifindex <= 0 && flags == 0)
- return;
-
- fputs("\n-- Information acquired via", stdout);
-
- if (flags != 0)
- printf(" protocol%s%s%s",
- flags & SD_RESOLVED_DNS ? " DNS" :"",
- flags & SD_RESOLVED_LLMNR_IPV4 ? " LLMNR/IPv4" : "",
- flags & SD_RESOLVED_LLMNR_IPV6 ? " LLMNR/IPv6" : "");
-
- if (ifindex > 0) {
- char ifname[IF_NAMESIZE] = "";
- printf(" interface %s", strna(if_indextoname(ifindex, ifname)));
- }
-
- fputc('.', stdout);
- fputc('\n', stdout);
-}
-
-static int resolve_host(sd_bus *bus, const char *name) {
-
- _cleanup_bus_message_unref_ sd_bus_message *req = NULL, *reply = NULL;
- _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
- const char *canonical = NULL;
- unsigned c = 0;
- int r, ifindex;
- uint64_t flags;
-
- assert(name);
-
- log_debug("Resolving %s (family %s, ifindex %i).", name, af_to_name(arg_family) ?: "*", arg_ifindex);
-
- 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_set_auto_start(req, false);
- 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);
-
- 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;
- }
-
- r = sd_bus_message_read(reply, "i", &ifindex);
- if (r < 0)
- return bus_log_parse_error(r);
-
- r = sd_bus_message_enter_container(reply, 'a', "(iay)");
- if (r < 0)
- return bus_log_parse_error(r);
-
- while ((r = sd_bus_message_enter_container(reply, 'r', "iay")) > 0) {
- const void *a;
- int family;
- size_t sz;
- _cleanup_free_ char *pretty = NULL;
- char ifname[IF_NAMESIZE] = "";
-
- r = sd_bus_message_read(reply, "i", &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");
- continue;
- }
-
- if (ifindex > 0) {
- char *t;
-
- t = if_indextoname(ifindex, ifname);
- if (!t) {
- log_error("Failed to resolve interface name for index %i", ifindex);
- continue;
- }
- }
-
- r = in_addr_to_string(family, a, &pretty);
- if (r < 0) {
- log_error_errno(r, "%s: failed to print address: %m", name);
- continue;
- }
-
- 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(ifindex, flags);
-
- return 0;
-}
-
-static int resolve_address(sd_bus *bus, int family, const union in_addr_union *address, int ifindex) {
- _cleanup_bus_message_unref_ sd_bus_message *req = NULL, *reply = NULL;
- _cleanup_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;
- const char *n;
- int r;
-
- assert(bus);
- assert(IN_SET(family, AF_INET, AF_INET6));
- assert(address);
-
- r = in_addr_to_string(family, address, &pretty);
- if (r < 0)
- return log_oom();
-
- if (ifindex > 0) {
- char *t;
-
- t = if_indextoname(ifindex, ifname);
- if (!t) {
- log_error("Failed to resolve interface name for index %i", ifindex);
- return -errno;
- }
- }
-
- 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_set_auto_start(req, false);
- 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);
-
- 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;
- }
-
- r = sd_bus_message_read(reply, "i", &ifindex);
- if (r < 0)
- return bus_log_parse_error(r);
-
- r = sd_bus_message_enter_container(reply, 'a', "s");
- if (r < 0)
- return bus_log_create_error(r);
-
- while ((r = sd_bus_message_read(reply, "s", &n)) > 0) {
-
- printf("%*s%s%s%s %s\n",
- (int) strlen(pretty), c == 0 ? pretty : "",
- isempty(ifname) ? "" : "%", 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(ifindex, flags);
-
- return 0;
-}
-
-static int parse_address(const char *s, int *family, union in_addr_union *address, int *ifindex) {
- const char *percent, *a;
- int ifi = 0;
- int r;
-
- percent = strchr(s, '%');
- if (percent) {
- r = safe_atoi(percent+1, &ifi);
- if (r < 0 || ifi <= 0) {
- ifi = if_nametoindex(percent+1);
- if (ifi <= 0)
- return -EINVAL;
- }
-
- a = strndupa(s, percent - s);
- } else
- a = s;
-
- r = in_addr_from_string_auto(a, family, address);
- if (r < 0)
- return r;
-
- *ifindex = ifi;
- return 0;
-}
-
-static int resolve_record(sd_bus *bus, const char *name) {
-
- _cleanup_bus_message_unref_ sd_bus_message *req = NULL, *reply = NULL;
- _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
- unsigned n = 0;
- uint64_t flags;
- int r, ifindex;
-
- assert(name);
-
- log_debug("Resolving %s %s %s.", name, dns_class_to_string(arg_class), dns_type_to_string(arg_type));
-
- 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_set_auto_start(req, false);
- if (r < 0)
- return bus_log_create_error(r);
-
- assert((uint16_t) arg_type == arg_type);
- r = sd_bus_message_append(req, "isqqt", arg_ifindex, name, arg_class, arg_type, arg_flags);
- if (r < 0)
- return bus_log_create_error(r);
-
- 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;
- }
-
- r = sd_bus_message_read(reply, "i", &ifindex);
- if (r < 0)
- return bus_log_parse_error(r);
-
- r = sd_bus_message_enter_container(reply, 'a', "(qqay)");
- if (r < 0)
- return bus_log_parse_error(r);
-
- while ((r = sd_bus_message_enter_container(reply, 'r', "qqay")) > 0) {
- _cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
- _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
- _cleanup_free_ char *s = NULL;
- uint16_t c, t;
- const void *d;
- size_t l;
-
- r = sd_bus_message_read(reply, "qq", &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);
-
- r = dns_packet_new(&p, DNS_PROTOCOL_DNS, 0);
- if (r < 0)
- return log_oom();
-
- r = dns_packet_append_blob(p, d, l, NULL);
- if (r < 0)
- return log_oom();
-
- r = dns_packet_read_rr(p, &rr, NULL);
- if (r < 0) {
- log_error("Failed to parse RR.");
- return r;
- }
-
- r = dns_resource_record_to_string(rr, &s);
- if (r < 0) {
- log_error("Failed to format RR.");
- return r;
- }
-
- printf("%s\n", s);
- 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(ifindex, flags);
-
- return 0;
-}
-
-static void help_dns_types(void) {
- int i;
- const char *t;
-
- if (arg_legend)
- puts("Known dns 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) {
- int i;
- const char *t;
-
- if (arg_legend)
- puts("Known dns classes:");
- for (i = 0; i < _DNS_CLASS_MAX; i++) {
- t = dns_class_to_string(i);
- if (t)
- puts(t);
- }
-}
-
-static void help(void) {
- printf("%s [OPTIONS...]\n\n"
- "Resolve IPv4 or IPv6 addresses.\n\n"
- " -h --help Show this help\n"
- " --version Show package version\n"
- " -4 Resolve IPv4 addresses\n"
- " -6 Resolve IPv6 addresses\n"
- " -i INTERFACE Look on interface\n"
- " -p --protocol=PROTOCOL Look via protocol\n"
- " -t --type=TYPE Query RR with DNS type\n"
- " -c --class=CLASS Query RR with DNS class\n"
- " --legend[=BOOL] Do [not] print column headers\n"
- , program_invocation_short_name);
-}
-
-static int parse_argv(int argc, char *argv[]) {
- enum {
- ARG_VERSION = 0x100,
- ARG_LEGEND,
- };
-
- 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", optional_argument, NULL, ARG_LEGEND },
- { "protocol", required_argument, NULL, 'p' },
- {}
- };
-
- 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:
- puts(PACKAGE_STRING);
- puts(SYSTEMD_FEATURES);
- return 0 /* done */;
-
- case '4':
- arg_family = AF_INET;
- break;
-
- case '6':
- arg_family = AF_INET6;
- break;
-
- case 'i':
- arg_ifindex = if_nametoindex(optarg);
- if (arg_ifindex <= 0)
- return log_error_errno(errno, "Unknown interfaces %s: %m", optarg);
- break;
-
- case 't':
- if (streq(optarg, "help")) {
- help_dns_types();
- return 0;
- }
-
- arg_type = dns_type_from_string(optarg);
- if (arg_type < 0) {
- log_error("Failed to parse RR record type %s", optarg);
- return arg_type;
- }
- assert(arg_type > 0 && (uint16_t) arg_type == arg_type);
-
- break;
-
- case 'c':
- if (streq(optarg, "help")) {
- help_dns_classes();
- return 0;
- }
-
- r = dns_class_from_string(optarg, &arg_class);
- if (r < 0) {
- log_error("Failed to parse RR record class %s", optarg);
- return r;
- }
-
- break;
-
- case ARG_LEGEND:
- if (optarg) {
- r = parse_boolean(optarg);
- if (r < 0) {
- log_error("Failed to parse --legend= argument");
- return r;
- }
-
- arg_legend = !!r;
- } else
- arg_legend = false;
- break;
-
- case 'p':
- 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 '?':
- 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_class == 0)
- arg_class = DNS_CLASS_IN;
-
- return 1 /* work to do */;
-}
-
-int main(int argc, char **argv) {
- _cleanup_bus_close_unref_ sd_bus *bus = NULL;
- int r;
-
- log_parse_environment();
- log_open();
-
- r = parse_argv(argc, argv);
- if (r <= 0)
- goto finish;
-
- if (optind >= argc) {
- log_error("No arguments passed");
- r = -EINVAL;
- goto finish;
- }
-
- r = sd_bus_open_system(&bus);
- if (r < 0) {
- log_error_errno(r, "sd_bus_open_system: %m");
- goto finish;
- }
-
- while (argv[optind]) {
- int family, ifindex, k;
- union in_addr_union a;
-
- if (arg_type != 0)
- k = resolve_record(bus, argv[optind]);
- else {
- k = parse_address(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++;
- }
-
-finish:
- return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
-}
~ianmdlvl / elogind.git / commitdiff