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authorMarcel Holtmann <marcel@holtmann.org>2009-04-23 00:48:10 +0100
committerMarcel Holtmann <marcel@holtmann.org>2009-04-23 00:48:10 +0100
commitf67f58354bef906f35aa28346052d8f6b2ffae08 (patch)
treeb157154f02b5b51d23c1879c3279392d7dd5e9df /plugins/loopback.c
parent1d03ff3861fe4c04840744c58abc684bedb69712 (diff)
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Add monitoring of /etc/hostname modifications
Diffstat (limited to 'plugins/loopback.c')
-rw-r--r--plugins/loopback.c112
1 files changed, 110 insertions, 2 deletions
diff --git a/plugins/loopback.c b/plugins/loopback.c
index 04b29e1d..7eac1e87 100644
--- a/plugins/loopback.c
+++ b/plugins/loopback.c
@@ -28,14 +28,112 @@
#include <limits.h>
#include <string.h>
#include <sys/ioctl.h>
+#include <sys/inotify.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <net/if.h>
+#include <glib.h>
+
#define CONNMAN_API_SUBJECT_TO_CHANGE
#include <connman/plugin.h>
#include <connman/log.h>
+static GIOChannel *inotify_channel = NULL;
+
+static int hostname_descriptor = -1;
+
+static gboolean inotify_event(GIOChannel *channel,
+ GIOCondition condition, gpointer data)
+{
+ unsigned char buf[129], *ptr = buf;
+ gsize len;
+ GIOError err;
+
+ if (condition & (G_IO_HUP | G_IO_ERR))
+ return FALSE;
+
+ memset(buf, 0, sizeof(buf));
+
+ err = g_io_channel_read(channel, (gchar *) buf, sizeof(buf) - 1, &len);
+ if (err != G_IO_ERROR_NONE) {
+ if (err == G_IO_ERROR_AGAIN)
+ return TRUE;
+ connman_error("Reading from inotify channel failed");
+ return FALSE;
+ }
+
+ while (len >= sizeof(struct inotify_event)) {
+ struct inotify_event *evt = (struct inotify_event *) ptr;
+
+ if (evt->wd == hostname_descriptor) {
+ if (evt->mask & (IN_CREATE | IN_MOVED_TO))
+ connman_info("create hostname file");
+
+ if (evt->mask & (IN_DELETE | IN_MOVED_FROM))
+ connman_info("delete hostname file");
+
+ if (evt->mask & (IN_MODIFY | IN_MOVE_SELF))
+ connman_info("modify hostname file");
+ }
+
+ len -= sizeof(struct inotify_event) + evt->len;
+ ptr += sizeof(struct inotify_event) + evt->len;
+ }
+
+ return TRUE;
+}
+
+static int create_watch(void)
+{
+ int fd;
+
+ fd = inotify_init();
+ if (fd < 0) {
+ connman_error("Creation of inotify context failed");
+ return -EIO;
+ }
+
+ inotify_channel = g_io_channel_unix_new(fd);
+ if (inotify_channel == NULL) {
+ connman_error("Creation of inotify channel failed");
+ close(fd);
+ return -EIO;
+ }
+
+ g_io_add_watch(inotify_channel, G_IO_IN | G_IO_ERR | G_IO_HUP,
+ inotify_event, NULL);
+
+ hostname_descriptor = inotify_add_watch(fd, "/etc/hostname",
+ IN_MODIFY | IN_DELETE_SELF | IN_MOVE_SELF);
+ if (hostname_descriptor < 0) {
+ connman_error("Creation of hostname watch failed");
+ g_io_channel_unref(inotify_channel);
+ inotify_channel = NULL;
+ close(fd);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static void remove_watch(void)
+{
+ int fd;
+
+ if (inotify_channel == NULL)
+ return;
+
+ fd = g_io_channel_unix_get_fd(inotify_channel);
+
+ if (hostname_descriptor >= 0)
+ inotify_rm_watch(fd, hostname_descriptor);
+
+ g_io_channel_unref(inotify_channel);
+
+ close(fd);
+}
+
static int setup_hostname(void)
{
char name[HOST_NAME_MAX + 1];
@@ -52,7 +150,7 @@ static int setup_hostname(void)
return 0;
}
-static int loopback_init(void)
+static int setup_loopback(void)
{
struct ifreq ifr;
struct sockaddr_in *addr;
@@ -115,13 +213,23 @@ static int loopback_init(void)
done:
close(sk);
+ return err;
+}
+
+static int loopback_init(void)
+{
+ setup_loopback();
+
setup_hostname();
- return err;
+ create_watch();
+
+ return 0;
}
static void loopback_exit(void)
{
+ remove_watch();
}
CONNMAN_PLUGIN_DEFINE(loopback, "Loopback device plugin", VERSION,