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From: David Zeuthen <zeuthen@chromium.org>
Date: Tue, 5 Mar 2013 19:52:38 +0000 (-0800)
Subject: avahi-daemon: add option "host-name-from-machine-id="
X-Git-Url: http://git.0pointer.de/?p=avahi.git;a=commitdiff_plain;h=147cdce70b22ae7cee9fb4fe123db40952f31c9e
avahi-daemon: add option "host-name-from-machine-id="
Signed-off-by: David Zeuthen <zeuthen@chromium.org>
---
diff --git a/avahi-daemon/main.c b/avahi-daemon/main.c
index d46f40a..8c28fd6 100644
--- a/avahi-daemon/main.c
+++ b/avahi-daemon/main.c
@@ -65,6 +65,7 @@
#include <avahi-core/publish.h>
#include <avahi-core/dns-srv-rr.h>
#include <avahi-core/log.h>
+#include <avahi-core/util.h>
#ifdef ENABLE_CHROOT
#include "chroot.h"
@@ -576,6 +577,29 @@ static int parse_usec(const char *s, AvahiUsec *u) {
return 0;
}
+static char *get_machine_id(void) {
+ int fd;
+ char buf[32];
+
+ fd = open("/etc/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY);
+ if (fd == -1 && errno == ENOENT)
+ fd = open("/var/lib/dbus/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY);
+ if (fd == -1)
+ return NULL;
+
+ /* File is on a filesystem so we never get EINTR or partial reads */
+ if (read(fd, buf, sizeof buf) != sizeof buf) {
+ close(fd);
+ return NULL;
+ }
+ close(fd);
+
+ /* Contents can be lower, upper and even mixed case so normalize */
+ avahi_strdown(buf);
+
+ return avahi_strndup(buf, sizeof buf);
+}
+
static int load_config_file(DaemonConfig *c) {
int r = -1;
AvahiIniFile *f;
@@ -631,6 +655,15 @@ static int load_config_file(DaemonConfig *c) {
c->server_config.use_iff_running = is_yes(p->value);
else if (strcasecmp(p->key, "disallow-other-stacks") == 0)
c->server_config.disallow_other_stacks = is_yes(p->value);
+ else if (strcasecmp(p->key, "host-name-from-machine-id") == 0) {
+ if (*(p->value) == 'y' || *(p->value) == 'Y') {
+ char *machine_id = get_machine_id();
+ if (machine_id != NULL) {
+ avahi_free(c->server_config.host_name);
+ c->server_config.host_name = machine_id;
+ }
+ }
+ }
#ifdef HAVE_DBUS
else if (strcasecmp(p->key, "enable-dbus") == 0) {
diff --git a/man/avahi-daemon.conf.5.xml.in b/man/avahi-daemon.conf.5.xml.in
index bea7ed5..2d15017 100644
--- a/man/avahi-daemon.conf.5.xml.in
+++ b/man/avahi-daemon.conf.5.xml.in
@@ -40,6 +40,12 @@
</option>
<option>
+ <p><opt>host-name-from-machine-id=</opt> Takes a boolean
+ value ("yes" or "no"). If set to "yes" avahi-daemon
+ will use the machine-id as name on the LAN.</p>
+ </option>
+
+ <option>
<p><opt>domain-name=</opt> Set the default domain name avahi-daemon
tries to register its host name and services on the LAN in. If
omitted defaults to ".local".</p>
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