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resolved: add a DNS client stub resolver

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Let's turn resolved into a something truly useful: a fully asynchronous
DNS stub resolver that subscribes to network changes.

(More to come: caching, LLMNR, mDNS/DNS-SD, DNSSEC, IDN, NSS module)
This commit is contained in:
Lennart Poettering
2014-07-16 00:31:38 +02:00
parent 337ede5693
commit 74b2466e14
27 changed files with 4297 additions and 178 deletions
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src/resolve/resolved.c
+16 -19
View File
@@ -28,7 +28,7 @@
#include "capability.h"
int main(int argc, char *argv[]) {
_cleanup_manager_free_ Manager *m = NULL;
_cleanup_(manager_freep) Manager *m = NULL;
const char *user = "systemd-resolve";
uid_t uid;
gid_t gid;
@@ -43,13 +43,13 @@ int main(int argc, char *argv[]) {
if (argc != 1) {
log_error("This program takes no arguments.");
r = -EINVAL;
goto out;
goto finish;
}
r = get_user_creds(&user, &uid, &gid, NULL, NULL);
if (r < 0) {
log_error("Cannot resolve user name %s: %s", user, strerror(-r));
goto out;
goto finish;
}
/* Always create the directory where resolv.conf will live */
@@ -57,33 +57,31 @@ int main(int argc, char *argv[]) {
if (r < 0) {
log_error("Could not create runtime directory: %s",
strerror(-r));
goto out;
goto finish;
}
r = drop_privileges(uid, gid, 0);
if (r < 0)
goto out;
goto finish;
assert_se(sigprocmask_many(SIG_BLOCK, SIGTERM, SIGINT, -1) == 0);
r = manager_new(&m);
if (r < 0) {
log_error("Could not create manager: %s", strerror(-r));
goto out;
goto finish;
}
r = manager_network_monitor_listen(m);
if (r < 0) {
log_error("Could not listen for network events: %s", strerror(-r));
goto out;
}
r = manager_parse_config_file(m);
if (r < 0)
return r;
/* write out default resolv.conf to avoid a
* dangling symlink */
r = manager_update_resolv_conf(m);
/* write finish default resolv.conf to avoid a dangling
* symlink */
r = manager_write_resolv_conf(m);
if (r < 0) {
log_error("Could not create resolv.conf: %s", strerror(-r));
goto out;
goto finish;
}
sd_notify(false,
@@ -93,12 +91,11 @@ int main(int argc, char *argv[]) {
r = sd_event_loop(m->event);
if (r < 0) {
log_error("Event loop failed: %s", strerror(-r));
goto out;
goto finish;
}
out:
sd_notify(false,
"STATUS=Shutting down...");
finish:
sd_notify(false, "STATUS=Shutting down...");
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}