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-rw-r--r--man/systemd-resolve.xml7
-rw-r--r--src/resolve/resolve-tool.c522
2 files changed, 526 insertions, 3 deletions
diff --git a/man/systemd-resolve.xml b/man/systemd-resolve.xml
index b917ac20a2..b7fbee3154 100644
--- a/man/systemd-resolve.xml
+++ b/man/systemd-resolve.xml
@@ -294,8 +294,15 @@
<listitem><para>Flushes all DNS resource record caches the service maintains locally.</para></listitem>
</varlistentry>
+ <varlistentry>
+ <term><option>--status</option></term>
+
+ <listitem><para>Shows the global and per-link DNS settings in currently in effect.</para></listitem>
+ </varlistentry>
+
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />
+ <xi:include href="standard-options.xml" xpointer="no-pager" />
</variablelist>
</refsect1>
diff --git a/src/resolve/resolve-tool.c b/src/resolve/resolve-tool.c
index 2cb2e42b23..4e1e916669 100644
--- a/src/resolve/resolve-tool.c
+++ b/src/resolve/resolve-tool.c
@@ -21,17 +21,21 @@
#include <net/if.h>
#include "sd-bus.h"
+#include "sd-netlink.h"
#include "af-list.h"
#include "alloc-util.h"
#include "bus-error.h"
#include "bus-util.h"
#include "escape.h"
-#include "in-addr-util.h"
#include "gcrypt-util.h"
+#include "in-addr-util.h"
+#include "netlink-util.h"
+#include "pager.h"
#include "parse-util.h"
#include "resolved-def.h"
#include "resolved-dns-packet.h"
+#include "strv.h"
#include "terminal-util.h"
#define DNS_CALL_TIMEOUT_USEC (45*USEC_PER_SEC)
@@ -42,6 +46,7 @@ static uint16_t arg_type = 0;
static uint16_t arg_class = 0;
static bool arg_legend = true;
static uint64_t arg_flags = 0;
+static bool arg_no_pager = false;
typedef enum ServiceFamily {
SERVICE_FAMILY_TCP,
@@ -67,6 +72,7 @@ static enum {
MODE_STATISTICS,
MODE_RESET_STATISTICS,
MODE_FLUSH_CACHES,
+ MODE_STATUS,
} arg_mode = MODE_RESOLVE_HOST;
static ServiceFamily service_family_from_string(const char *s) {
@@ -1031,6 +1037,472 @@ static int flush_caches(sd_bus *bus) {
return 0;
}
+static int map_link_dns_servers(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
+ char ***l = userdata;
+ int r;
+
+ assert(bus);
+ assert(member);
+ assert(m);
+ assert(l);
+
+ r = sd_bus_message_enter_container(m, 'a', "(iay)");
+ if (r < 0)
+ return r;
+
+ for (;;) {
+ const void *a;
+ char *pretty;
+ int family;
+ size_t sz;
+
+ r = sd_bus_message_enter_container(m, 'r', "iay");
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ r = sd_bus_message_read(m, "i", &family);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_read_array(m, 'y', &a, &sz);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_exit_container(m);
+ if (r < 0)
+ return r;
+
+ if (!IN_SET(family, AF_INET, AF_INET6)) {
+ log_debug("Unexpected family, ignoring.");
+ continue;
+ }
+
+ if (sz != FAMILY_ADDRESS_SIZE(family)) {
+ log_debug("Address size mismatch, ignoring.");
+ continue;
+ }
+
+ r = in_addr_to_string(family, a, &pretty);
+ if (r < 0)
+ return r;
+
+ r = strv_consume(l, pretty);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_bus_message_exit_container(m);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static int map_link_domains(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
+ char ***l = userdata;
+ int r;
+
+ assert(bus);
+ assert(member);
+ assert(m);
+ assert(l);
+
+ r = sd_bus_message_enter_container(m, 'a', "(sb)");
+ if (r < 0)
+ return r;
+
+ for (;;) {
+ const char *domain;
+ int route_only;
+ char *pretty;
+
+ r = sd_bus_message_read(m, "(sb)", &domain, &route_only);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ if (route_only)
+ pretty = strappend("~", domain);
+ else
+ pretty = strdup(domain);
+ if (!pretty)
+ return -ENOMEM;
+
+ r = strv_consume(l, pretty);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_bus_message_exit_container(m);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static int status_ifindex(sd_bus *bus, int ifindex, const char *name, bool *empty_line) {
+
+ struct link_info {
+ uint64_t scopes_mask;
+ char *llmnr;
+ char *mdns;
+ char *dnssec;
+ char **dns;
+ char **domains;
+ char **ntas;
+ int dnssec_supported;
+ } link_info = {};
+
+ static const struct bus_properties_map property_map[] = {
+ { "ScopesMask", "t", NULL, offsetof(struct link_info, scopes_mask) },
+ { "DNS", "a(iay)", map_link_dns_servers, offsetof(struct link_info, dns) },
+ { "Domains", "a(sb)", map_link_domains, offsetof(struct link_info, domains) },
+ { "LLMNR", "s", NULL, offsetof(struct link_info, llmnr) },
+ { "MulticastDNS", "s", NULL, offsetof(struct link_info, mdns) },
+ { "DNSSEC", "s", NULL, offsetof(struct link_info, dnssec) },
+ { "DNSSECNegativeTrustAnchors", "as", NULL, offsetof(struct link_info, ntas) },
+ { "DNSSECSupported", "b", NULL, offsetof(struct link_info, dnssec_supported) },
+ {}
+ };
+
+ _cleanup_free_ char *ifi = NULL, *p = NULL;
+ char ifname[IF_NAMESIZE] = "";
+ char **i;
+ int r;
+
+ assert(bus);
+ assert(ifindex > 0);
+ assert(empty_line);
+
+ if (!name) {
+ if (!if_indextoname(ifindex, ifname))
+ return log_error_errno(errno, "Failed to resolve interface name for %i: %m", ifindex);
+
+ name = ifname;
+ }
+
+ if (asprintf(&ifi, "%i", ifindex) < 0)
+ return log_oom();
+
+ r = sd_bus_path_encode("/org/freedesktop/resolve1/link", ifi, &p);
+ if (r < 0)
+ return log_oom();
+
+ r = bus_map_all_properties(bus,
+ "org.freedesktop.resolve1",
+ p,
+ property_map,
+ &link_info);
+ if (r < 0) {
+ log_error_errno(r, "Failed to get link data for %i: %m", ifindex);
+ goto finish;
+ }
+
+ pager_open(arg_no_pager, false);
+
+ if (*empty_line)
+ fputc('\n', stdout);
+
+ printf("%sLink %i (%s)%s\n",
+ ansi_highlight(), ifindex, name, ansi_normal());
+
+ if (link_info.scopes_mask == 0)
+ printf(" Current Scopes: none\n");
+ else
+ printf(" Current Scopes:%s%s%s%s%s\n",
+ link_info.scopes_mask & SD_RESOLVED_DNS ? " DNS" : "",
+ link_info.scopes_mask & SD_RESOLVED_LLMNR_IPV4 ? " LLMNR/IPv4" : "",
+ link_info.scopes_mask & SD_RESOLVED_LLMNR_IPV6 ? " LLMNR/IPv6" : "",
+ link_info.scopes_mask & SD_RESOLVED_MDNS_IPV4 ? " mDNS/IPv4" : "",
+ link_info.scopes_mask & SD_RESOLVED_MDNS_IPV6 ? " mDNS/IPv6" : "");
+
+ printf(" LLMNR setting: %s\n"
+ "MulticastDNS setting: %s\n"
+ " DNSSEC setting: %s\n"
+ " DNSSEC supported: %s\n",
+ strna(link_info.llmnr),
+ strna(link_info.mdns),
+ strna(link_info.dnssec),
+ yes_no(link_info.dnssec_supported));
+
+ STRV_FOREACH(i, link_info.dns) {
+ printf(" %s %s\n",
+ i == link_info.dns ? "DNS Server:" : " ",
+ *i);
+ }
+
+ STRV_FOREACH(i, link_info.domains) {
+ printf(" %s %s\n",
+ i == link_info.domains ? "DNS Domain:" : " ",
+ *i);
+ }
+
+ STRV_FOREACH(i, link_info.ntas) {
+ printf(" %s %s\n",
+ i == link_info.ntas ? "DNSSEC NTA:" : " ",
+ *i);
+ }
+
+ *empty_line = true;
+
+ r = 0;
+
+finish:
+ strv_free(link_info.dns);
+ strv_free(link_info.domains);
+ free(link_info.llmnr);
+ free(link_info.mdns);
+ free(link_info.dnssec);
+ strv_free(link_info.ntas);
+ return r;
+}
+
+static int map_global_dns_servers(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
+ char ***l = userdata;
+ int r;
+
+ assert(bus);
+ assert(member);
+ assert(m);
+ assert(l);
+
+ r = sd_bus_message_enter_container(m, 'a', "(iiay)");
+ if (r < 0)
+ return r;
+
+ for (;;) {
+ const void *a;
+ char *pretty;
+ int family, ifindex;
+ size_t sz;
+
+ r = sd_bus_message_enter_container(m, 'r', "iiay");
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ r = sd_bus_message_read(m, "ii", &ifindex, &family);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_read_array(m, 'y', &a, &sz);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_exit_container(m);
+ if (r < 0)
+ return r;
+
+ if (ifindex != 0) /* only show the global ones here */
+ continue;
+
+ if (!IN_SET(family, AF_INET, AF_INET6)) {
+ log_debug("Unexpected family, ignoring.");
+ continue;
+ }
+
+ if (sz != FAMILY_ADDRESS_SIZE(family)) {
+ log_debug("Address size mismatch, ignoring.");
+ continue;
+ }
+
+ r = in_addr_to_string(family, a, &pretty);
+ if (r < 0)
+ return r;
+
+ r = strv_consume(l, pretty);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_bus_message_exit_container(m);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static int map_global_domains(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) {
+ char ***l = userdata;
+ int r;
+
+ assert(bus);
+ assert(member);
+ assert(m);
+ assert(l);
+
+ r = sd_bus_message_enter_container(m, 'a', "(isb)");
+ if (r < 0)
+ return r;
+
+ for (;;) {
+ const char *domain;
+ int route_only, ifindex;
+ char *pretty;
+
+ r = sd_bus_message_read(m, "(isb)", &ifindex, &domain, &route_only);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+
+ if (ifindex != 0) /* only show the global ones here */
+ continue;
+
+ if (route_only)
+ pretty = strappend("~", domain);
+ else
+ pretty = strdup(domain);
+ if (!pretty)
+ return -ENOMEM;
+
+ r = strv_consume(l, pretty);
+ if (r < 0)
+ return r;
+ }
+
+ r = sd_bus_message_exit_container(m);
+ if (r < 0)
+ return r;
+
+ return 0;
+}
+
+static int status_global(sd_bus *bus, bool *empty_line) {
+
+ struct global_info {
+ char **dns;
+ char **domains;
+ char **ntas;
+ } global_info = {};
+
+ static const struct bus_properties_map property_map[] = {
+ { "DNS", "a(iiay)", map_global_dns_servers, offsetof(struct global_info, dns) },
+ { "Domains", "a(isb)", map_global_domains, offsetof(struct global_info, domains) },
+ { "DNSSECNegativeTrustAnchors", "as", NULL, offsetof(struct global_info, ntas) },
+ {}
+ };
+
+ char **i;
+ int r;
+
+ assert(bus);
+ assert(empty_line);
+
+ r = bus_map_all_properties(bus,
+ "org.freedesktop.resolve1",
+ "/org/freedesktop/resolve1",
+ property_map,
+ &global_info);
+ if (r < 0) {
+ log_error_errno(r, "Failed to get global data: %m");
+ goto finish;
+ }
+
+ if (strv_isempty(global_info.dns) && strv_isempty(global_info.domains) && strv_isempty(global_info.ntas)) {
+ r = 0;
+ goto finish;
+ }
+
+ pager_open(arg_no_pager, false);
+
+ printf("%sGlobal%s\n", ansi_highlight(), ansi_normal());
+ STRV_FOREACH(i, global_info.dns) {
+ printf(" %s %s\n",
+ i == global_info.dns ? "DNS Server:" : " ",
+ *i);
+ }
+
+ STRV_FOREACH(i, global_info.domains) {
+ printf(" %s %s\n",
+ i == global_info.domains ? "DNS Domain:" : " ",
+ *i);
+ }
+
+ strv_sort(global_info.ntas);
+ STRV_FOREACH(i, global_info.ntas) {
+ printf(" %s %s\n",
+ i == global_info.ntas ? "DNSSEC NTA:" : " ",
+ *i);
+ }
+
+ *empty_line = true;
+
+ r = 0;
+
+finish:
+ strv_free(global_info.dns);
+ strv_free(global_info.domains);
+ strv_free(global_info.ntas);
+
+ return r;
+}
+
+static int status_all(sd_bus *bus) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
+ _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
+ sd_netlink_message *i;
+ bool empty_line = true;
+ int r;
+
+ assert(bus);
+
+ r = status_global(bus, &empty_line);
+ if (r < 0)
+ return r;
+
+ r = sd_netlink_open(&rtnl);
+ if (r < 0)
+ return log_error_errno(r, "Failed to connect to netlink: %m");
+
+ r = sd_rtnl_message_new_link(rtnl, &req, RTM_GETLINK, 0);
+ if (r < 0)
+ return rtnl_log_create_error(r);
+
+ r = sd_netlink_message_request_dump(req, true);
+ if (r < 0)
+ return rtnl_log_create_error(r);
+
+ r = sd_netlink_call(rtnl, req, 0, &reply);
+ if (r < 0)
+ return log_error_errno(r, "Failed to enumerate links: %m");
+
+ r = 0;
+ for (i = reply; i; i = sd_netlink_message_next(i)) {
+ const char *name;
+ int ifindex, q;
+ uint16_t type;
+
+ 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;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-01 18:17:09 +0000