+#if defined(LWS_USE_IPV6)
+LWS_EXTERN unsigned long
+lws_get_addr_scope(const char *ipaddr)
+{
+ unsigned long scope = 0;
+
+#ifndef WIN32
+ struct ifaddrs *addrs, *addr;
+ char ip[NI_MAXHOST];
+ unsigned int i;
+
+ getifaddrs(&addrs);
+ for (addr = addrs; addr; addr = addr->ifa_next) {
+ if (!addr->ifa_addr ||
+ addr->ifa_addr->sa_family != AF_INET6)
+ continue;
+
+ getnameinfo(addr->ifa_addr,
+ sizeof(struct sockaddr_in6),
+ ip, sizeof(ip),
+ NULL, 0, NI_NUMERICHOST);
+
+ i = 0;
+ while (ip[i])
+ if (ip[i++] == '%') {
+ ip[i - 1] = '\0';
+ break;
+ }
+
+ if (!strcmp(ip, ipaddr)) {
+ scope = if_nametoindex(addr->ifa_name);
+ break;
+ }
+ }
+ freeifaddrs(addrs);
+#else
+ PIP_ADAPTER_ADDRESSES adapter, addrs = NULL;
+ PIP_ADAPTER_UNICAST_ADDRESS addr;
+ ULONG size = 0;
+ DWORD ret;
+ struct sockaddr_in6 *sockaddr;
+ char ip[NI_MAXHOST];
+ unsigned int i;
+ int found = 0;
+
+ for (i = 0; i < 5; i++)
+ {
+ ret = GetAdaptersAddresses(AF_INET6, GAA_FLAG_INCLUDE_PREFIX,
+ NULL, addrs, &size);
+ if ((ret == NO_ERROR) || (ret == ERROR_NO_DATA)) {
+ break;
+ } else if (ret == ERROR_BUFFER_OVERFLOW)
+ {
+ if (addrs)
+ free(addrs);
+ addrs = (IP_ADAPTER_ADDRESSES *) malloc(size);
+ } else
+ {
+ if (addrs)
+ {
+ free(addrs);
+ addrs = NULL;
+ }
+ lwsl_err("Failed to get IPv6 address table (%d)", ret);
+ break;
+ }
+ }
+
+ if ((ret == NO_ERROR) && (addrs))
+ {
+ adapter = addrs;
+ while ((adapter) && (!found))
+ {
+ addr = adapter->FirstUnicastAddress;
+ while ((addr) && (!found))
+ {
+ if (addr->Address.lpSockaddr->sa_family == AF_INET6)
+ {
+ sockaddr = (struct sockaddr_in6 *) (addr->Address.lpSockaddr);
+
+ lws_plat_inet_ntop(sockaddr->sin6_family, &sockaddr->sin6_addr,
+ ip, sizeof(ip));
+
+ if (!strcmp(ip, ipaddr)) {
+ scope = sockaddr->sin6_scope_id;
+ found = 1;
+ break;
+ }
+ }
+ addr = addr->Next;
+ }
+ adapter = adapter->Next;
+ }
+ }
+ if (addrs)
+ free(addrs);
+#endif
+
+ return scope;
+}
+#endif
+