| /*-*- 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_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; |
| } |