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#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <talloc/talloc.h>
#include <waiter/waiter.h>
#include <log/log.h>
#include "event.h"
#include "udev.h"
#include "pb-discover.h"
#include "device-handler.h"
#define PBOOT_DEVICE_SOCKET "/tmp/petitboot.udev"
#define max(a, b) ((a) > (b) ? (a) : (b))
struct udev {
struct device_handler *handler;
int socket;
};
static void udev_print_event(struct event *event)
{
const char *action, *params[] = {
"DEVNAME", "ID_TYPE", "ID_BUS", "ID_FS_UUID", "ID_FS_LABEL",
NULL,
};
int i;
action = event->action == EVENT_ACTION_ADD ? "add" : "remove";
pb_log("udev %s event:\n", action);
pb_log("\tdevice: %s\n", event->device);
for (i = 0; params[i]; i++)
pb_log("\t%-12s => %s\n",
params[i], event_get_param(event, params[i]));
}
static void udev_handle_message(struct udev *udev, char *buf, int len)
{
int result;
struct event *event;
event = talloc(udev, struct event);
event->type = EVENT_TYPE_UDEV;
result = event_parse_ad_message(event, buf, len);
if (result)
return;
udev_print_event(event);
device_handler_event(udev->handler, event);
talloc_free(event);
return;
}
static int udev_process(void *arg)
{
struct udev *udev = arg;
char buf[4096];
int len;
len = recvfrom(udev->socket, buf, sizeof(buf), 0, NULL, NULL);
if (len < 0) {
pb_log("udev socket read failed: %s", strerror(errno));
return -1;
}
if (len == 0)
return 0;
udev_handle_message(udev, buf, len);
return 0;
}
static int udev_destructor(void *p)
{
struct udev *udev = p;
if (udev->socket >= 0)
close(udev->socket);
return 0;
}
struct udev *udev_init(struct device_handler *handler)
{
struct sockaddr_un addr;
struct udev *udev;
unlink(PBOOT_DEVICE_SOCKET);
udev = talloc(NULL, struct udev);
udev->handler = handler;
udev->socket = socket(PF_UNIX, SOCK_DGRAM, 0);
if (udev->socket < 0) {
pb_log("Error creating udev socket: %s\n", strerror(errno));
goto out_err;
}
talloc_set_destructor(udev, udev_destructor);
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, PBOOT_DEVICE_SOCKET);
if (bind(udev->socket, (struct sockaddr *)&addr, sizeof(addr))) {
pb_log("Error binding udev socket: %s\n", strerror(errno));
goto out_err;
}
waiter_register(udev->socket, WAIT_IN, udev_process, udev);
pb_log("%s: waiting on %s\n", __func__, PBOOT_DEVICE_SOCKET);
return udev;
out_err:
talloc_free(udev);
return NULL;
}
int udev_trigger(struct udev __attribute__((unused)) *udev)
{
int rc = system("/sbin/udevadm trigger --subsystem-match=block");
if (rc)
pb_log("udev trigger failed: %d (%d)\n", rc, WEXITSTATUS(rc));
return WEXITSTATUS(rc);
}
void udev_destroy(struct udev *udev)
{
talloc_free(udev);
}
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