/*-*- 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 .
***/
#include
#include
#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;
}