652 lines
21 KiB
C
652 lines
21 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2014 Zbigniew Jędrzejewski-Szmek
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <net/if.h>
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#include <getopt.h>
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#include "sd-bus.h"
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#include "bus-util.h"
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#include "bus-error.h"
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#include "in-addr-util.h"
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#include "af-list.h"
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#include "build.h"
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#include "resolved-dns-packet.h"
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#include "resolved-def.h"
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#define DNS_CALL_TIMEOUT_USEC (45*USEC_PER_SEC)
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static int arg_family = AF_UNSPEC;
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static int arg_ifindex = 0;
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static int arg_type = 0;
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static uint16_t arg_class = 0;
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static bool arg_legend = true;
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static uint64_t arg_flags = 0;
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static void print_source(int ifindex, uint64_t flags, usec_t rtt) {
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char rtt_str[FORMAT_TIMESTAMP_MAX];
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if (!arg_legend)
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return;
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if (ifindex <= 0 && flags == 0)
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return;
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fputs("\n-- Information acquired via", stdout);
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if (flags != 0)
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printf(" protocol%s%s%s",
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flags & SD_RESOLVED_DNS ? " DNS" :"",
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flags & SD_RESOLVED_LLMNR_IPV4 ? " LLMNR/IPv4" : "",
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flags & SD_RESOLVED_LLMNR_IPV6 ? " LLMNR/IPv6" : "");
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if (ifindex > 0) {
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char ifname[IF_NAMESIZE] = "";
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printf(" interface %s", strna(if_indextoname(ifindex, ifname)));
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}
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assert_se(format_timespan(rtt_str, sizeof(rtt_str), rtt, 100));
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printf(" in %s", rtt_str);
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fputc('.', stdout);
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fputc('\n', stdout);
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}
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static int resolve_host(sd_bus *bus, const char *name) {
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_cleanup_bus_message_unref_ sd_bus_message *req = NULL, *reply = NULL;
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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const char *canonical = NULL;
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unsigned c = 0;
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int r, ifindex;
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uint64_t flags;
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usec_t ts;
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assert(name);
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log_debug("Resolving %s (family %s, ifindex %i).", name, af_to_name(arg_family) ?: "*", arg_ifindex);
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r = sd_bus_message_new_method_call(
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bus,
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&req,
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"org.freedesktop.resolve1",
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"/org/freedesktop/resolve1",
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"org.freedesktop.resolve1.Manager",
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"ResolveHostname");
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if (r < 0)
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return bus_log_create_error(r);
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r = sd_bus_message_append(req, "isit", arg_ifindex, name, arg_family, arg_flags);
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if (r < 0)
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return bus_log_create_error(r);
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ts = now(CLOCK_MONOTONIC);
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r = sd_bus_call(bus, req, DNS_CALL_TIMEOUT_USEC, &error, &reply);
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if (r < 0) {
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log_error("%s: resolve call failed: %s", name, bus_error_message(&error, r));
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return r;
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}
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ts = now(CLOCK_MONOTONIC) - ts;
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r = sd_bus_message_read(reply, "i", &ifindex);
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if (r < 0)
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return bus_log_parse_error(r);
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r = sd_bus_message_enter_container(reply, 'a', "(iay)");
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if (r < 0)
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return bus_log_parse_error(r);
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while ((r = sd_bus_message_enter_container(reply, 'r', "iay")) > 0) {
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const void *a;
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int family;
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size_t sz;
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_cleanup_free_ char *pretty = NULL;
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char ifname[IF_NAMESIZE] = "";
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r = sd_bus_message_read(reply, "i", &family);
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if (r < 0)
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return bus_log_parse_error(r);
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r = sd_bus_message_read_array(reply, 'y', &a, &sz);
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if (r < 0)
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return bus_log_parse_error(r);
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r = sd_bus_message_exit_container(reply);
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if (r < 0)
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return bus_log_parse_error(r);
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if (!IN_SET(family, AF_INET, AF_INET6)) {
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log_debug("%s: skipping entry with family %d (%s)", name, family, af_to_name(family) ?: "unknown");
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continue;
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}
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if (sz != FAMILY_ADDRESS_SIZE(family)) {
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log_error("%s: systemd-resolved returned address of invalid size %zu for family %s",
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name, sz, af_to_name(family) ?: "unknown");
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continue;
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}
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if (ifindex > 0) {
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char *t;
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t = if_indextoname(ifindex, ifname);
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if (!t) {
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log_error("Failed to resolve interface name for index %i", ifindex);
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continue;
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}
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}
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r = in_addr_to_string(family, a, &pretty);
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if (r < 0) {
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log_error_errno(r, "%s: failed to print address: %m", name);
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continue;
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}
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printf("%*s%s %s%s%s\n",
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(int) strlen(name), c == 0 ? name : "", c == 0 ? ":" : " ",
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pretty,
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isempty(ifname) ? "" : "%", ifname);
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c++;
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}
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if (r < 0)
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return bus_log_parse_error(r);
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r = sd_bus_message_exit_container(reply);
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if (r < 0)
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return bus_log_parse_error(r);
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r = sd_bus_message_read(reply, "st", &canonical, &flags);
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if (r < 0)
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return bus_log_parse_error(r);
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if (!streq(name, canonical)) {
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printf("%*s%s (%s)\n",
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(int) strlen(name), c == 0 ? name : "", c == 0 ? ":" : " ",
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canonical);
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}
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if (c == 0) {
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log_error("%s: no addresses found", name);
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return -ESRCH;
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}
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print_source(ifindex, flags, ts);
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return 0;
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}
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static int resolve_address(sd_bus *bus, int family, const union in_addr_union *address, int ifindex) {
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_cleanup_bus_message_unref_ sd_bus_message *req = NULL, *reply = NULL;
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_free_ char *pretty = NULL;
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char ifname[IF_NAMESIZE] = "";
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uint64_t flags;
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unsigned c = 0;
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const char *n;
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usec_t ts;
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int r;
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assert(bus);
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assert(IN_SET(family, AF_INET, AF_INET6));
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assert(address);
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r = in_addr_to_string(family, address, &pretty);
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if (r < 0)
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return log_oom();
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if (ifindex > 0) {
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char *t;
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t = if_indextoname(ifindex, ifname);
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if (!t) {
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log_error("Failed to resolve interface name for index %i", ifindex);
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return -errno;
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}
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}
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log_debug("Resolving %s%s%s.", pretty, isempty(ifname) ? "" : "%", ifname);
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r = sd_bus_message_new_method_call(
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bus,
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&req,
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"org.freedesktop.resolve1",
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"/org/freedesktop/resolve1",
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"org.freedesktop.resolve1.Manager",
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"ResolveAddress");
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if (r < 0)
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return bus_log_create_error(r);
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r = sd_bus_message_set_auto_start(req, false);
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if (r < 0)
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return bus_log_create_error(r);
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r = sd_bus_message_append(req, "ii", ifindex, family);
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if (r < 0)
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return bus_log_create_error(r);
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r = sd_bus_message_append_array(req, 'y', address, FAMILY_ADDRESS_SIZE(family));
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if (r < 0)
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return bus_log_create_error(r);
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r = sd_bus_message_append(req, "t", arg_flags);
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if (r < 0)
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return bus_log_create_error(r);
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ts = now(CLOCK_MONOTONIC);
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r = sd_bus_call(bus, req, DNS_CALL_TIMEOUT_USEC, &error, &reply);
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if (r < 0) {
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log_error("%s: resolve call failed: %s", pretty, bus_error_message(&error, r));
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return r;
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}
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ts = now(CLOCK_MONOTONIC) - ts;
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r = sd_bus_message_read(reply, "i", &ifindex);
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if (r < 0)
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return bus_log_parse_error(r);
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r = sd_bus_message_enter_container(reply, 'a', "s");
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if (r < 0)
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return bus_log_create_error(r);
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while ((r = sd_bus_message_read(reply, "s", &n)) > 0) {
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printf("%*s%s%s%s %s\n",
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(int) strlen(pretty), c == 0 ? pretty : "",
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isempty(ifname) ? "" : "%", ifname,
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c == 0 ? ":" : " ",
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n);
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c++;
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}
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if (r < 0)
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return bus_log_parse_error(r);
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r = sd_bus_message_exit_container(reply);
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if (r < 0)
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return bus_log_parse_error(r);
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r = sd_bus_message_read(reply, "t", &flags);
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if (r < 0)
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return bus_log_parse_error(r);
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if (c == 0) {
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log_error("%s: no names found", pretty);
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return -ESRCH;
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}
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print_source(ifindex, flags, ts);
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return 0;
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}
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static int parse_address(const char *s, int *family, union in_addr_union *address, int *ifindex) {
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const char *percent, *a;
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int ifi = 0;
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int r;
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percent = strchr(s, '%');
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if (percent) {
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r = safe_atoi(percent+1, &ifi);
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if (r < 0 || ifi <= 0) {
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ifi = if_nametoindex(percent+1);
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if (ifi <= 0)
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return -EINVAL;
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}
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a = strndupa(s, percent - s);
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} else
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a = s;
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r = in_addr_from_string_auto(a, family, address);
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if (r < 0)
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return r;
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*ifindex = ifi;
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return 0;
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}
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static int resolve_record(sd_bus *bus, const char *name) {
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_cleanup_bus_message_unref_ sd_bus_message *req = NULL, *reply = NULL;
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_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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unsigned n = 0;
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uint64_t flags;
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int r, ifindex;
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usec_t ts;
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assert(name);
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log_debug("Resolving %s %s %s.", name, dns_class_to_string(arg_class), dns_type_to_string(arg_type));
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r = sd_bus_message_new_method_call(
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bus,
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&req,
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"org.freedesktop.resolve1",
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"/org/freedesktop/resolve1",
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"org.freedesktop.resolve1.Manager",
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"ResolveRecord");
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if (r < 0)
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return bus_log_create_error(r);
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assert((uint16_t) arg_type == arg_type);
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r = sd_bus_message_append(req, "isqqt", arg_ifindex, name, arg_class, arg_type, arg_flags);
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if (r < 0)
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return bus_log_create_error(r);
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ts = now(CLOCK_MONOTONIC);
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r = sd_bus_call(bus, req, DNS_CALL_TIMEOUT_USEC, &error, &reply);
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if (r < 0) {
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log_error("%s: resolve call failed: %s", name, bus_error_message(&error, r));
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return r;
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}
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ts = now(CLOCK_MONOTONIC) - ts;
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r = sd_bus_message_read(reply, "i", &ifindex);
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if (r < 0)
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return bus_log_parse_error(r);
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r = sd_bus_message_enter_container(reply, 'a', "(qqay)");
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if (r < 0)
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return bus_log_parse_error(r);
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while ((r = sd_bus_message_enter_container(reply, 'r', "qqay")) > 0) {
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_cleanup_(dns_resource_record_unrefp) DnsResourceRecord *rr = NULL;
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_cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
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_cleanup_free_ char *s = NULL;
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uint16_t c, t;
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const void *d;
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size_t l;
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r = sd_bus_message_read(reply, "qq", &c, &t);
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if (r < 0)
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return bus_log_parse_error(r);
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r = sd_bus_message_read_array(reply, 'y', &d, &l);
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if (r < 0)
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return bus_log_parse_error(r);
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r = sd_bus_message_exit_container(reply);
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if (r < 0)
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return bus_log_parse_error(r);
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r = dns_packet_new(&p, DNS_PROTOCOL_DNS, 0);
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if (r < 0)
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return log_oom();
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r = dns_packet_append_blob(p, d, l, NULL);
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if (r < 0)
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return log_oom();
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r = dns_packet_read_rr(p, &rr, NULL);
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if (r < 0) {
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log_error("Failed to parse RR.");
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return r;
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}
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r = dns_resource_record_to_string(rr, &s);
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if (r < 0) {
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log_error("Failed to format RR.");
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return r;
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}
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printf("%s\n", s);
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n++;
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}
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if (r < 0)
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return bus_log_parse_error(r);
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r = sd_bus_message_exit_container(reply);
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if (r < 0)
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return bus_log_parse_error(r);
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r = sd_bus_message_read(reply, "t", &flags);
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if (r < 0)
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return bus_log_parse_error(r);
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if (n == 0) {
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log_error("%s: no records found", name);
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return -ESRCH;
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}
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print_source(ifindex, flags, ts);
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return 0;
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}
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static void help_dns_types(void) {
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int i;
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const char *t;
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if (arg_legend)
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puts("Known dns types:");
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for (i = 0; i < _DNS_TYPE_MAX; i++) {
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t = dns_type_to_string(i);
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if (t)
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puts(t);
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}
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}
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static void help_dns_classes(void) {
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int i;
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const char *t;
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if (arg_legend)
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puts("Known dns classes:");
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for (i = 0; i < _DNS_CLASS_MAX; i++) {
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t = dns_class_to_string(i);
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if (t)
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puts(t);
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}
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}
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static void help(void) {
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printf("%s [OPTIONS...]\n\n"
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"Resolve IPv4 or IPv6 addresses.\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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" -4 Resolve IPv4 addresses\n"
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" -6 Resolve IPv6 addresses\n"
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" -i INTERFACE Look on interface\n"
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" -p --protocol=PROTOCOL Look via protocol\n"
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" -t --type=TYPE Query RR with DNS type\n"
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" -c --class=CLASS Query RR with DNS class\n"
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" --legend[=BOOL] Do [not] print column headers\n"
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, program_invocation_short_name);
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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ARG_LEGEND,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "type", required_argument, NULL, 't' },
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{ "class", required_argument, NULL, 'c' },
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{ "legend", optional_argument, NULL, ARG_LEGEND },
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{ "protocol", required_argument, NULL, 'p' },
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{}
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};
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int c, r;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h46i:t:c:p:", options, NULL)) >= 0)
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switch(c) {
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case 'h':
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help();
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return 0; /* done */;
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case ARG_VERSION:
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puts(PACKAGE_STRING);
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puts(SYSTEMD_FEATURES);
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return 0 /* done */;
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case '4':
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arg_family = AF_INET;
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break;
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case '6':
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arg_family = AF_INET6;
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break;
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case 'i':
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arg_ifindex = if_nametoindex(optarg);
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|
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_flush_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;
|
|
}
|