/*-*- 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
#include "sd-bus.h"
#include "bus-util.h"
#include "bus-error.h"
#include "bus-errors.h"
#include "in-addr-util.h"
#include "af-list.h"
#include "build.h"
#define DNS_CALL_TIMEOUT_USEC (45*USEC_PER_SEC)
static int arg_family = AF_UNSPEC;
static int arg_ifindex = 0;
static int resolve_host(sd_bus *bus, const char *name, int _family, 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;
unsigned c = 0;
int r;
assert(name);
log_debug("Resolving %s (family %s)",
name, af_to_name(_family));
r = sd_bus_message_new_method_call(
bus,
&req,
"org.freedesktop.resolve1",
"/org/freedesktop/resolve1",
"org.freedesktop.resolve1.Manager",
"ResolveHostname");
if (r < 0) {
log_error("sd_bus_message_new_method_call: %s", strerror(-r));
return r;
}
r = sd_bus_message_set_auto_start(req, false);
if (r < 0) {
log_error("sd_bus_message_set_auto_start: %s", strerror(-r));
return r;
}
r = sd_bus_message_append(req, "si", name, AF_UNSPEC);
if (r < 0) {
log_error("sd_bus_message_append: %s", strerror(-r));
return 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_enter_container(reply, 'a', "(iayi)");
if (r < 0) {
log_error("%s: failed to parse reply: %s", name, bus_error_message(&error, r));
return r;
}
while ((r = sd_bus_message_enter_container(reply, 'r', "iayi")) > 0) {
const void *a;
int family, ifindex;
size_t sz;
_cleanup_free_ char *pretty = NULL;
char ifname[IF_NAMESIZE] = "";
r = sd_bus_message_read(reply, "i", &family);
if (r < 0) {
log_error("Cannot parse message, aborting.");
return -EBADMSG;
}
r = sd_bus_message_read_array(reply, 'y', &a, &sz);
if (r < 0) {
log_error("Cannot parse message, aborting.");
return -EBADMSG;
}
r = sd_bus_message_read(reply, "i", &ifindex);
if (r < 0) {
log_error("Cannot parse message, aborting.");
return -EBADMSG;
}
r = sd_bus_message_exit_container(reply);
if (r < 0) {
log_error("Cannot parse message, aborting.");
return -EBADMSG;
}
if ((_family != AF_UNSPEC && family != _family) ||
!IN_SET(family, AF_INET, AF_INET6)) {
log_debug("%s: skipping entry with family %hu (%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) {
log_error("%s: systemd-resolved returned invalid interface index %i",
name, ifindex);
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;
}
}
if (_ifindex > 0 && ifindex > 0 && ifindex != _ifindex) {
log_debug("%s: skipping entry with ifindex %i (%s)",
name, ifindex, ifname);
continue;
}
r = in_addr_to_string(family, a, &pretty);
if (r < 0) {
log_error("%s: failed to print address: %s", name, strerror(-r));
continue;
}
log_info("%*s%s %s%s%.*s",
(int) strlen(name), c == 0 ? name : "", c == 0 ? ":" : " ",
pretty,
*ifname ? "%" : "", (int) sizeof(ifname), *ifname ? ifname: "");
c++;
}
if (c == 0) {
log_error("%s: no addresses found", name);
return -ENONET;
}
return sd_bus_message_exit_container(reply);
}
static void help(void) {
printf("%s [OPTIONS...]\n\n"
"Resolve IPv4 or IPv6 addresses.\n\n"
"Options:\n"
" -4 Resolve IPv4 addresses\n"
" -6 Resolve IPv6 addresses\n"
" -i INTERFACE Filter by interface\n"
" -h --help Show this help and exit\n"
" --version Print version string and exit\n"
, program_invocation_short_name
);
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h46i:", 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) {
log_error("Unknown interfaces %s: %m", optarg);
return -EINVAL;
}
break;
case '?':
return -EINVAL;
default:
assert_not_reached("Unhandled option");
}
return 1 /* work to do */;
}
int main(int argc, char **argv) {
_cleanup_bus_unref_ sd_bus *bus = NULL;
int r;
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
goto end;
r = sd_bus_open_system(&bus);
if (r < 0) {
log_error("sd_bus_open_system: %s", strerror(-r));
goto end;
}
while (argv[optind]) {
int k;
k = resolve_host(bus, argv[optind++], arg_family, arg_ifindex);
if (r == 0)
r = k;
}
end:
return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}