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author | Marcel Holtmann <marcel@holtmann.org> | 2009-04-23 00:48:10 +0100 |
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committer | Marcel Holtmann <marcel@holtmann.org> | 2009-04-23 00:48:10 +0100 |
commit | f67f58354bef906f35aa28346052d8f6b2ffae08 (patch) | |
tree | b157154f02b5b51d23c1879c3279392d7dd5e9df /plugins/loopback.c | |
parent | 1d03ff3861fe4c04840744c58abc684bedb69712 (diff) | |
download | connman-f67f58354bef906f35aa28346052d8f6b2ffae08.tar.gz connman-f67f58354bef906f35aa28346052d8f6b2ffae08.tar.bz2 connman-f67f58354bef906f35aa28346052d8f6b2ffae08.zip |
Add monitoring of /etc/hostname modifications
Diffstat (limited to 'plugins/loopback.c')
-rw-r--r-- | plugins/loopback.c | 112 |
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, |