/* * 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; }