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/*
* (C) 2011-2013 by Christian Hesse <mail@eworm.de>
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <libnotify/notify.h>
#include <libmnl/libmnl.h>
#include <linux/if.h>
#include <linux/if_link.h>
#include <linux/rtnetlink.h>
#define PROGNAME "netlink-notify"
#define NOTIFICATION_TIMEOUT 10000
#ifndef DEBUG
#define DEBUG 0
#endif
#define ICON_NETWORK_ONLINE "network-transmit-receive"
#define ICON_NETWORK_OFFLINE "network-error"
#define TEXT_TOPIC "Netlink Notification"
#define TEXT_NOTIFICATION "Interface <b>%s</b> is <b>%s</b>."
#define TEXT_NOTIFICATION_DEBUG "%s: Interface %s (index %d) is %s.\n"
// we need these to be global...
unsigned int netlinksize = 1; // never use 0 and avoid overwriting the main pointer...
size_t * notificationref;
char * program = NULL;
static int data_attr_cb(const struct nlattr * attr, void * data) {
const struct nlattr ** tb = data;
int type = mnl_attr_get_type(attr);
if (mnl_attr_type_valid(attr, IFLA_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case IFLA_MTU:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
fprintf(stderr, "%s: Invalid netlink attribute.\n", program);
return MNL_CB_ERROR;
}
break;
case IFLA_IFNAME:
if (mnl_attr_validate(attr, MNL_TYPE_STRING) < 0) {
fprintf(stderr, "%s: Invalid netlink attribute.\n", program);
return MNL_CB_ERROR;
}
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static int data_cb(const struct nlmsghdr * nlh, void * data) {
struct nlattr * tb[IFLA_MAX + 1] = {};
struct ifinfomsg * ifm = mnl_nlmsg_get_payload(nlh);
char * notifystr = NULL;
const char * interface = NULL;
NotifyNotification * notification = NULL;
unsigned int errcount = 0;
gboolean res = FALSE;
GError * error = NULL;
mnl_attr_parse(nlh, sizeof(* ifm), data_attr_cb, tb);
interface = mnl_attr_get_str(tb[IFLA_IFNAME]);
notifystr = malloc(strlen(interface) + strlen(TEXT_NOTIFICATION) + 1); // 2* %s is enough for "down", but we need an additional byte for \n
sprintf(notifystr, TEXT_NOTIFICATION, interface, (ifm->ifi_flags & IFF_RUNNING ? "up" : "down"));
#if DEBUG
printf(TEXT_NOTIFICATION_DEBUG, program, interface, ifm->ifi_index, (ifm->ifi_flags & IFF_RUNNING ? "up" : "down"));
#endif
if (netlinksize < ifm->ifi_index) {
notificationref = realloc(notificationref, (ifm->ifi_index + 1) * sizeof(size_t));
while(netlinksize < ifm->ifi_index)
notificationref[++netlinksize] = 0;
}
if (notificationref[ifm->ifi_index] == 0) {
notification = notify_notification_new(TEXT_TOPIC, notifystr, (ifm->ifi_flags & IFF_RUNNING ? ICON_NETWORK_ONLINE : ICON_NETWORK_OFFLINE));
notificationref[ifm->ifi_index] = (size_t)notification;
} else {
notification = (NotifyNotification *)notificationref[ifm->ifi_index];
notify_notification_update(notification, TEXT_TOPIC, notifystr, (ifm->ifi_flags & IFF_RUNNING ? ICON_NETWORK_ONLINE : ICON_NETWORK_OFFLINE));
}
notify_notification_set_timeout(notification, NOTIFICATION_TIMEOUT);
notify_notification_set_category(notification, PROGNAME);
notify_notification_set_urgency(notification, NOTIFY_URGENCY_NORMAL);
while(!notify_notification_show(notification, &error)) {
if (errcount > 1) {
fprintf(stderr, "%s: Looks like we can not reconnect to notification daemon... Exiting.\n", program);
exit(EXIT_FAILURE);
} else {
g_printerr("%s: Error \"%s\" while trying to show notification. Trying to reconnect.\n", program, error->message);
errcount++;
g_error_free(error);
error = NULL;
notify_uninit();
usleep(500 * 1000);
if(!notify_init(PROGNAME)) {
fprintf(stderr, "%s: Can't create notify.\n", program);
exit(EXIT_FAILURE);
}
}
}
errcount = 0;
free(notifystr);
return MNL_CB_OK;
}
int main(int argc, char ** argv) {
struct mnl_socket * nl;
char buf[MNL_SOCKET_BUFFER_SIZE];
int ret;
program = argv[0];
printf("%s: %s v%s (compiled: " __DATE__ ", " __TIME__ ")\n", argv[0], PROGNAME, VERSION);
if(!notify_init(PROGNAME)) {
fprintf(stderr, "%s: Can't create notify.\n", argv[0]);
exit(EXIT_FAILURE);
}
nl = mnl_socket_open(NETLINK_ROUTE);
if (!nl) {
fprintf(stderr, "%s: Can't create netlink socket.\n", argv[0]);
exit(EXIT_FAILURE);
}
if (mnl_socket_bind(nl, RTMGRP_LINK, MNL_SOCKET_AUTOPID) < 0) {
fprintf(stderr, "%s: Can't bind netlink socket.\n", argv[0]);
exit(EXIT_FAILURE);
}
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
while (ret > 0) {
ret = mnl_cb_run(buf, ret, 0, 0, data_cb, NULL);
if (ret <= 0)
break;
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
}
if (ret == -1) {
fprintf(stderr, "%s: An error occured reading from netlink socket.\n", argv[0]);
exit(EXIT_FAILURE);
}
mnl_socket_close(nl);
return EXIT_SUCCESS;
}
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