/**
* check if the literal address string has %nn appended returns -1 if not, or the numeric value
* otherwise.
*
* <p>%nn may also be a string that represents the displayName of a currently available
* NetworkInterface.
*/
private static int checkNumericZone(String s) throws UnknownHostException {
int percent = s.indexOf('%');
int slen = s.length();
int digit, zone = 0;
if (percent == -1) {
return -1;
}
for (int i = percent + 1; i < slen; i++) {
char c = s.charAt(i);
if (c == ']') {
if (i == percent + 1) {
/* empty per-cent field */
return -1;
}
break;
}
if ((digit = Character.digit(c, 10)) < 0) {
return -1;
}
zone = (zone * 10) + digit;
}
return zone;
}
private static InetAddress[] getAllByName(String host, InetAddress reqAddr)
throws UnknownHostException {
if (host == null || host.length() == 0) {
InetAddress[] ret = new InetAddress[1];
ret[0] = impl.loopbackAddress();
return ret;
}
boolean ipv6Expected = false;
if (host.charAt(0) == '[') {
// This is supposed to be an IPv6 litteral
if (host.length() > 2 && host.charAt(host.length() - 1) == ']') {
host = host.substring(1, host.length() - 1);
ipv6Expected = true;
} else {
// This was supposed to be a IPv6 address, but it's not!
throw new UnknownHostException(host);
}
}
// if host is an IP address, we won't do further lookup
if (Character.digit(host.charAt(0), 16) != -1 || (host.charAt(0) == ':')) {
byte[] addr = null;
int numericZone = -1;
String ifname = null;
// see if it is IPv4 address
addr = IPAddressUtil.textToNumericFormatV4(host);
if (addr == null) {
// see if it is IPv6 address
// Check if a numeric or string zone id is present
int pos;
if ((pos = host.indexOf("%")) != -1) {
numericZone = checkNumericZone(host);
if (numericZone == -1) {
/* remainder of string must be an ifname */
ifname = host.substring(pos + 1);
}
}
addr = IPAddressUtil.textToNumericFormatV6(host);
} else if (ipv6Expected) {
// Means an IPv4 litteral between brackets!
throw new UnknownHostException("[" + host + "]");
}
InetAddress[] ret = new InetAddress[1];
if (addr != null) {
if (addr.length == Inet4Address.INADDRSZ) {
ret[0] = new Inet4Address(null, addr);
} else {
if (ifname != null) {
ret[0] = new Inet6Address(null, addr, ifname);
} else {
ret[0] = new Inet6Address(null, addr, numericZone);
}
}
return ret;
}
} else if (ipv6Expected) {
// We were expecting an IPv6 Litteral, but got something else
throw new UnknownHostException("[" + host + "]");
}
return getAllByName0(host, reqAddr, true);
}