/*
* Get interface data from cache or live interface
*/
static struct wireless_iface *
iw_get_interface_data(int ifindex)
{
struct wireless_iface * curr;
int skfd = -1; /* ioctl socket */
/* Search for it in the database */
curr = interface_cache;
while(curr != NULL)
{
/* Match ? */
if(curr->ifindex == ifindex)
{
//printf("Cache : found %d-%s\n", curr->ifindex, curr->ifname);
/* Return */
return(curr);
}
/* Next entry */
curr = curr->next;
}
/* Create a channel to the NET kernel. Doesn't happen too often, so
* socket creation overhead is minimal... */
if((skfd = iw_sockets_open()) < 0)
{
perror("iw_sockets_open");
return(NULL);
}
/* Create new entry, zero, init */
curr = calloc(1, sizeof(struct wireless_iface));
if(!curr)
{
fprintf(stderr, "Malloc failed\n");
return(NULL);
}
curr->ifindex = ifindex;
/* Extract static data */
if(index2name(skfd, ifindex, curr->ifname) < 0)
{
perror("index2name");
free(curr);
return(NULL);
}
curr->has_range = (iw_get_range_info(skfd, curr->ifname, &curr->range) >= 0);
//printf("Cache : create %d-%s\n", curr->ifindex, curr->ifname);
/* Done */
iw_sockets_close(skfd);
/* Link it */
curr->next = interface_cache;
interface_cache = curr;
return(curr);
}
/*
* Respond to a single RTM_NEWLINK event from the rtnetlink socket.
*/
static int
LinkCatcher(struct nlmsghdr *nlh)
{
struct ifinfomsg* ifi;
char ifname[IFNAMSIZ + 1];
#if 0
fprintf(stderr, "nlmsg_type = %d.\n", nlh->nlmsg_type);
#endif
if(nlh->nlmsg_type != RTM_NEWLINK)
return 0;
ifi = NLMSG_DATA(nlh);
/* Get a name... */
index2name(ifi->ifi_index, ifname);
#if WIRELESS_EXT > 13
/* Code is ugly, but sort of works - Jean II */
/* Check for attributes */
if (nlh->nlmsg_len > NLMSG_ALIGN(sizeof(struct ifinfomsg))) {
int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(sizeof(struct ifinfomsg));
struct rtattr *attr = (void*)ifi + NLMSG_ALIGN(sizeof(struct ifinfomsg));
while (RTA_OK(attr, attrlen)) {
/* Check if the Wireless kind */
if(attr->rta_type == IFLA_WIRELESS) {
/* Go to display it */
print_event_stream(ifname,
(void *)attr + RTA_ALIGN(sizeof(struct rtattr)),
attr->rta_len - RTA_ALIGN(sizeof(struct rtattr)));
}
attr = RTA_NEXT(attr, attrlen);
}
}
#endif /* WIRELESS_EXT > 13 */
return 0;
}
