resolve: add "systemd-resolve --status" command
The new command shows the per-link and global DNS configuration currently in effect. This is useful to quickly see the DNS settings resolved acquired from networkd and that was pushed into it via the bus APIs.
This commit is contained in:
Lennart Poettering
parent
a37129796c
commit
be371fe039
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@ -294,8 +294,15 @@
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<listitem><para>Flushes all DNS resource record caches the service maintains locally.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--status</option></term>
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<listitem><para>Shows the global and per-link DNS settings in currently in effect.</para></listitem>
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</varlistentry>
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<xi:include href="standard-options.xml" xpointer="help" />
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<xi:include href="standard-options.xml" xpointer="version" />
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<xi:include href="standard-options.xml" xpointer="no-pager" />
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</variablelist>
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</refsect1>
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@ -21,17 +21,21 @@
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#include <net/if.h>
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#include "sd-bus.h"
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#include "sd-netlink.h"
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#include "af-list.h"
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#include "alloc-util.h"
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#include "bus-error.h"
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#include "bus-util.h"
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#include "escape.h"
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#include "in-addr-util.h"
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#include "gcrypt-util.h"
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#include "in-addr-util.h"
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#include "netlink-util.h"
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#include "pager.h"
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#include "parse-util.h"
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#include "resolved-def.h"
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#include "resolved-dns-packet.h"
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#include "strv.h"
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#include "terminal-util.h"
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#define DNS_CALL_TIMEOUT_USEC (45*USEC_PER_SEC)
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@ -42,6 +46,7 @@ static uint16_t 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 bool arg_no_pager = false;
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typedef enum ServiceFamily {
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SERVICE_FAMILY_TCP,
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@ -67,6 +72,7 @@ static enum {
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MODE_STATISTICS,
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MODE_RESET_STATISTICS,
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MODE_FLUSH_CACHES,
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MODE_STATUS,
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} arg_mode = MODE_RESOLVE_HOST;
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static ServiceFamily service_family_from_string(const char *s) {
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@ -1031,6 +1037,472 @@ static int flush_caches(sd_bus *bus) {
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return 0;
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}
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static int map_link_dns_servers(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
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char ***l = userdata;
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int r;
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assert(bus);
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assert(member);
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assert(m);
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assert(l);
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r = sd_bus_message_enter_container(m, 'a', "(iay)");
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if (r < 0)
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return r;
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for (;;) {
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const void *a;
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char *pretty;
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int family;
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size_t sz;
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r = sd_bus_message_enter_container(m, 'r', "iay");
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if (r < 0)
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return r;
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if (r == 0)
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break;
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r = sd_bus_message_read(m, "i", &family);
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if (r < 0)
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return r;
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r = sd_bus_message_read_array(m, 'y', &a, &sz);
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if (r < 0)
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return r;
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r = sd_bus_message_exit_container(m);
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if (r < 0)
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return r;
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if (!IN_SET(family, AF_INET, AF_INET6)) {
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log_debug("Unexpected family, ignoring.");
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continue;
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}
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if (sz != FAMILY_ADDRESS_SIZE(family)) {
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log_debug("Address size mismatch, ignoring.");
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continue;
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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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return r;
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r = strv_consume(l, pretty);
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if (r < 0)
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return r;
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}
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r = sd_bus_message_exit_container(m);
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if (r < 0)
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return r;
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return 0;
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}
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static int map_link_domains(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
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char ***l = userdata;
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int r;
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assert(bus);
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assert(member);
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assert(m);
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assert(l);
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r = sd_bus_message_enter_container(m, 'a', "(sb)");
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if (r < 0)
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return r;
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for (;;) {
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const char *domain;
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int route_only;
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char *pretty;
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r = sd_bus_message_read(m, "(sb)", &domain, &route_only);
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if (r < 0)
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return r;
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if (r == 0)
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break;
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if (route_only)
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pretty = strappend("~", domain);
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else
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pretty = strdup(domain);
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if (!pretty)
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return -ENOMEM;
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r = strv_consume(l, pretty);
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if (r < 0)
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return r;
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}
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r = sd_bus_message_exit_container(m);
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if (r < 0)
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return r;
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return 0;
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}
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static int status_ifindex(sd_bus *bus, int ifindex, const char *name, bool *empty_line) {
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struct link_info {
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uint64_t scopes_mask;
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char *llmnr;
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char *mdns;
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char *dnssec;
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char **dns;
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char **domains;
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char **ntas;
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int dnssec_supported;
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} link_info = {};
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static const struct bus_properties_map property_map[] = {
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{ "ScopesMask", "t", NULL, offsetof(struct link_info, scopes_mask) },
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{ "DNS", "a(iay)", map_link_dns_servers, offsetof(struct link_info, dns) },
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{ "Domains", "a(sb)", map_link_domains, offsetof(struct link_info, domains) },
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{ "LLMNR", "s", NULL, offsetof(struct link_info, llmnr) },
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{ "MulticastDNS", "s", NULL, offsetof(struct link_info, mdns) },
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{ "DNSSEC", "s", NULL, offsetof(struct link_info, dnssec) },
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{ "DNSSECNegativeTrustAnchors", "as", NULL, offsetof(struct link_info, ntas) },
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{ "DNSSECSupported", "b", NULL, offsetof(struct link_info, dnssec_supported) },
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{}
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};
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_cleanup_free_ char *ifi = NULL, *p = NULL;
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char ifname[IF_NAMESIZE] = "";
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char **i;
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int r;
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assert(bus);
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assert(ifindex > 0);
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assert(empty_line);
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if (!name) {
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if (!if_indextoname(ifindex, ifname))
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return log_error_errno(errno, "Failed to resolve interface name for %i: %m", ifindex);
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name = ifname;
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}
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if (asprintf(&ifi, "%i", ifindex) < 0)
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return log_oom();
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r = sd_bus_path_encode("/org/freedesktop/resolve1/link", ifi, &p);
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if (r < 0)
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return log_oom();
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r = bus_map_all_properties(bus,
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"org.freedesktop.resolve1",
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p,
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property_map,
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&link_info);
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if (r < 0) {
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log_error_errno(r, "Failed to get link data for %i: %m", ifindex);
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goto finish;
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}
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pager_open(arg_no_pager, false);
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if (*empty_line)
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fputc('\n', stdout);
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printf("%sLink %i (%s)%s\n",
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ansi_highlight(), ifindex, name, ansi_normal());
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if (link_info.scopes_mask == 0)
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printf(" Current Scopes: none\n");
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else
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printf(" Current Scopes:%s%s%s%s%s\n",
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link_info.scopes_mask & SD_RESOLVED_DNS ? " DNS" : "",
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link_info.scopes_mask & SD_RESOLVED_LLMNR_IPV4 ? " LLMNR/IPv4" : "",
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link_info.scopes_mask & SD_RESOLVED_LLMNR_IPV6 ? " LLMNR/IPv6" : "",
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link_info.scopes_mask & SD_RESOLVED_MDNS_IPV4 ? " mDNS/IPv4" : "",
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link_info.scopes_mask & SD_RESOLVED_MDNS_IPV6 ? " mDNS/IPv6" : "");
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printf(" LLMNR setting: %s\n"
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"MulticastDNS setting: %s\n"
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" DNSSEC setting: %s\n"
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" DNSSEC supported: %s\n",
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strna(link_info.llmnr),
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strna(link_info.mdns),
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strna(link_info.dnssec),
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yes_no(link_info.dnssec_supported));
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STRV_FOREACH(i, link_info.dns) {
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printf(" %s %s\n",
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i == link_info.dns ? "DNS Server:" : " ",
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*i);
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}
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STRV_FOREACH(i, link_info.domains) {
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printf(" %s %s\n",
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i == link_info.domains ? "DNS Domain:" : " ",
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*i);
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}
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STRV_FOREACH(i, link_info.ntas) {
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printf(" %s %s\n",
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i == link_info.ntas ? "DNSSEC NTA:" : " ",
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*i);
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}
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*empty_line = true;
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r = 0;
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finish:
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strv_free(link_info.dns);
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strv_free(link_info.domains);
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free(link_info.llmnr);
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free(link_info.mdns);
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free(link_info.dnssec);
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strv_free(link_info.ntas);
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return r;
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}
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static int map_global_dns_servers(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
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char ***l = userdata;
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int r;
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assert(bus);
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assert(member);
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assert(m);
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assert(l);
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r = sd_bus_message_enter_container(m, 'a', "(iiay)");
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if (r < 0)
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return r;
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for (;;) {
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const void *a;
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char *pretty;
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int family, ifindex;
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size_t sz;
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r = sd_bus_message_enter_container(m, 'r', "iiay");
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if (r < 0)
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return r;
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if (r == 0)
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break;
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r = sd_bus_message_read(m, "ii", &ifindex, &family);
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if (r < 0)
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return r;
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r = sd_bus_message_read_array(m, 'y', &a, &sz);
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if (r < 0)
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return r;
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r = sd_bus_message_exit_container(m);
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if (r < 0)
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return r;
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if (ifindex != 0) /* only show the global ones here */
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continue;
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if (!IN_SET(family, AF_INET, AF_INET6)) {
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log_debug("Unexpected family, ignoring.");
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continue;
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}
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if (sz != FAMILY_ADDRESS_SIZE(family)) {
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log_debug("Address size mismatch, ignoring.");
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continue;
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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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return r;
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r = strv_consume(l, pretty);
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if (r < 0)
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return r;
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}
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r = sd_bus_message_exit_container(m);
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if (r < 0)
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return r;
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return 0;
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}
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static int map_global_domains(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
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char ***l = userdata;
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int r;
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assert(bus);
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assert(member);
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assert(m);
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assert(l);
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r = sd_bus_message_enter_container(m, 'a', "(isb)");
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if (r < 0)
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return r;
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for (;;) {
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const char *domain;
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int route_only, ifindex;
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char *pretty;
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r = sd_bus_message_read(m, "(isb)", &ifindex, &domain, &route_only);
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if (r < 0)
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return r;
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if (r == 0)
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break;
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if (ifindex != 0) /* only show the global ones here */
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continue;
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if (route_only)
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pretty = strappend("~", domain);
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else
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pretty = strdup(domain);
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if (!pretty)
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return -ENOMEM;
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r = strv_consume(l, pretty);
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if (r < 0)
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return r;
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}
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r = sd_bus_message_exit_container(m);
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if (r < 0)
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return r;
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return 0;
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}
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static int status_global(sd_bus *bus, bool *empty_line) {
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struct global_info {
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char **dns;
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char **domains;
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char **ntas;
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} global_info = {};
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static const struct bus_properties_map property_map[] = {
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{ "DNS", "a(iiay)", map_global_dns_servers, offsetof(struct global_info, dns) },
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{ "Domains", "a(isb)", map_global_domains, offsetof(struct global_info, domains) },
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{ "DNSSECNegativeTrustAnchors", "as", NULL, offsetof(struct global_info, ntas) },
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{}
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};
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char **i;
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int r;
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assert(bus);
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assert(empty_line);
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r = bus_map_all_properties(bus,
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"org.freedesktop.resolve1",
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"/org/freedesktop/resolve1",
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property_map,
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&global_info);
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if (r < 0) {
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log_error_errno(r, "Failed to get global data: %m");
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goto finish;
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}
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if (strv_isempty(global_info.dns) && strv_isempty(global_info.domains) && strv_isempty(global_info.ntas)) {
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r = 0;
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goto finish;
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}
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pager_open(arg_no_pager, false);
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printf("%sGlobal%s\n", ansi_highlight(), ansi_normal());
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STRV_FOREACH(i, global_info.dns) {
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printf(" %s %s\n",
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i == global_info.dns ? "DNS Server:" : " ",
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*i);
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}
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STRV_FOREACH(i, global_info.domains) {
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printf(" %s %s\n",
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i == global_info.domains ? "DNS Domain:" : " ",
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*i);
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}
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strv_sort(global_info.ntas);
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STRV_FOREACH(i, global_info.ntas) {
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printf(" %s %s\n",
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i == global_info.ntas ? "DNSSEC NTA:" : " ",
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*i);
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}
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*empty_line = true;
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r = 0;
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finish:
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strv_free(global_info.dns);
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strv_free(global_info.domains);
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strv_free(global_info.ntas);
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return r;
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}
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static int status_all(sd_bus *bus) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
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_cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
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sd_netlink_message *i;
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bool empty_line = true;
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int r;
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assert(bus);
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r = status_global(bus, &empty_line);
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if (r < 0)
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return r;
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r = sd_netlink_open(&rtnl);
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if (r < 0)
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return log_error_errno(r, "Failed to connect to netlink: %m");
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r = sd_rtnl_message_new_link(rtnl, &req, RTM_GETLINK, 0);
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if (r < 0)
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return rtnl_log_create_error(r);
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r = sd_netlink_message_request_dump(req, true);
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if (r < 0)
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return rtnl_log_create_error(r);
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r = sd_netlink_call(rtnl, req, 0, &reply);
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if (r < 0)
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return log_error_errno(r, "Failed to enumerate links: %m");
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r = 0;
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for (i = reply; i; i = sd_netlink_message_next(i)) {
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const char *name;
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int ifindex, q;
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uint16_t type;
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|
||||
q = sd_netlink_message_get_type(i, &type);
|
||||
if (q < 0)
|
||||
return rtnl_log_parse_error(q);
|
||||
|
||||
if (type != RTM_NEWLINK)
|
||||
continue;
|
||||
|
||||
q = sd_rtnl_message_link_get_ifindex(i, &ifindex);
|
||||
if (q < 0)
|
||||
return rtnl_log_parse_error(q);
|
||||
|
||||
if (ifindex == LOOPBACK_IFINDEX)
|
||||
continue;
|
||||
|
||||
q = sd_netlink_message_read_string(i, IFLA_IFNAME, &name);
|
||||
if (q < 0)
|
||||
return rtnl_log_parse_error(q);
|
||||
|
||||
q = status_ifindex(bus, ifindex, name, &empty_line);
|
||||
if (q < 0 && r >= 0)
|
||||
r = q;
|
||||
}
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
static void help_protocol_types(void) {
|
||||
if (arg_legend)
|
||||
puts("Known protocol types:");
|
||||
|
|
@ -1038,8 +1510,8 @@ static void help_protocol_types(void) {
|
|||
}
|
||||
|
||||
static void help_dns_types(void) {
|
||||
int i;
|
||||
const char *t;
|
||||
int i;
|
||||
|
||||
if (arg_legend)
|
||||
puts("Known DNS RR types:");
|
||||
|
|
@ -1051,8 +1523,8 @@ static void help_dns_types(void) {
|
|||
}
|
||||
|
||||
static void help_dns_classes(void) {
|
||||
int i;
|
||||
const char *t;
|
||||
int i;
|
||||
|
||||
if (arg_legend)
|
||||
puts("Known DNS RR classes:");
|
||||
|
|
@ -1073,6 +1545,7 @@ static void help(void) {
|
|||
"Resolve domain names, IPv4 and IPv6 addresses, DNS resource records, and services.\n\n"
|
||||
" -h --help Show this help\n"
|
||||
" --version Show package version\n"
|
||||
" --no-pager Do not pipe output into a pager\n"
|
||||
" -4 Resolve IPv4 addresses\n"
|
||||
" -6 Resolve IPv6 addresses\n"
|
||||
" -i --interface=INTERFACE Look on interface\n"
|
||||
|
|
@ -1091,6 +1564,7 @@ static void help(void) {
|
|||
" --legend=BOOL Print headers and additional info (default: yes)\n"
|
||||
" --statistics Show resolver statistics\n"
|
||||
" --reset-statistics Reset resolver statistics\n"
|
||||
" --status Show link and server status\n"
|
||||
" --flush-caches Flush all local DNS caches\n"
|
||||
, program_invocation_short_name);
|
||||
}
|
||||
|
|
@ -1109,7 +1583,9 @@ static int parse_argv(int argc, char *argv[]) {
|
|||
ARG_SEARCH,
|
||||
ARG_STATISTICS,
|
||||
ARG_RESET_STATISTICS,
|
||||
ARG_STATUS,
|
||||
ARG_FLUSH_CACHES,
|
||||
ARG_NO_PAGER,
|
||||
};
|
||||
|
||||
static const struct option options[] = {
|
||||
|
|
@ -1130,7 +1606,9 @@ static int parse_argv(int argc, char *argv[]) {
|
|||
{ "search", required_argument, NULL, ARG_SEARCH },
|
||||
{ "statistics", no_argument, NULL, ARG_STATISTICS, },
|
||||
{ "reset-statistics", no_argument, NULL, ARG_RESET_STATISTICS },
|
||||
{ "status", no_argument, NULL, ARG_STATUS },
|
||||
{ "flush-caches", no_argument, NULL, ARG_FLUSH_CACHES },
|
||||
{ "no-pager", no_argument, NULL, ARG_NO_PAGER },
|
||||
{}
|
||||
};
|
||||
|
||||
|
|
@ -1308,6 +1786,14 @@ static int parse_argv(int argc, char *argv[]) {
|
|||
arg_mode = MODE_FLUSH_CACHES;
|
||||
break;
|
||||
|
||||
case ARG_STATUS:
|
||||
arg_mode = MODE_STATUS;
|
||||
break;
|
||||
|
||||
case ARG_NO_PAGER:
|
||||
arg_no_pager = true;
|
||||
break;
|
||||
|
||||
case '?':
|
||||
return -EINVAL;
|
||||
|
||||
|
|
@ -1484,8 +1970,38 @@ int main(int argc, char **argv) {
|
|||
|
||||
r = flush_caches(bus);
|
||||
break;
|
||||
|
||||
case MODE_STATUS:
|
||||
|
||||
if (argc > optind) {
|
||||
char **ifname;
|
||||
bool empty_line = false;
|
||||
|
||||
r = 0;
|
||||
STRV_FOREACH(ifname, argv + optind) {
|
||||
int ifindex, q;
|
||||
|
||||
q = parse_ifindex(argv[optind], &ifindex);
|
||||
if (q < 0) {
|
||||
ifindex = if_nametoindex(argv[optind]);
|
||||
if (ifindex <= 0) {
|
||||
log_error_errno(errno, "Failed to resolve interface name: %s", argv[optind]);
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
q = status_ifindex(bus, ifindex, NULL, &empty_line);
|
||||
if (q < 0 && r >= 0)
|
||||
r = q;
|
||||
}
|
||||
} else
|
||||
r = status_all(bus);
|
||||
|
||||
break;
|
||||
}
|
||||
|
||||
finish:
|
||||
pager_close();
|
||||
|
||||
return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue