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/*
* Copyright (C) 2021 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package okhttp3.internal
import okio.Buffer
/**
* Quick and dirty pattern to differentiate IP addresses from hostnames. This is an approximation
* of Android's private InetAddress#isNumeric API.
*
* This matches IPv6 addresses as a hex string containing at least one colon, and possibly
* including dots after the first colon. It matches IPv4 addresses as strings containing only
* decimal digits and dots. This pattern matches strings like "a:.23" and "54" that are neither IP
* addresses nor hostnames; they will be verified as IP addresses (which is a more strict
* verification).
*/
private val VERIFY_AS_IP_ADDRESS = "([0-9a-fA-F]*:[0-9a-fA-F:.]*)|([\\d.]+)".toRegex()
/** Returns true if this string is not a host name and might be an IP address. */
fun String.canParseAsIpAddress(): Boolean = VERIFY_AS_IP_ADDRESS.matches(this)
/**
* Returns true if the length is not valid for DNS (empty or greater than 253 characters), or if any
* label is longer than 63 characters. Trailing dots are okay.
*/
internal fun String.containsInvalidLabelLengths(): Boolean {
if (length !in 1..253) return true
var labelStart = 0
while (true) {
val dot = indexOf('.', startIndex = labelStart)
val labelLength = when (dot) {
-1 -> length - labelStart
else -> dot - labelStart
}
if (labelLength !in 1..63) return true
if (dot == -1) break
if (dot == length - 1) break // Trailing '.' is allowed.
labelStart = dot + 1
}
return false
}
internal fun String.containsInvalidHostnameAsciiCodes(): Boolean {
for (i in 0 until length) {
val c = this[i]
// The WHATWG Host parsing rules accepts some character codes which are invalid by
// definition for OkHttp's host header checks (and the WHATWG Host syntax definition). Here
// we rule out characters that would cause problems in host headers.
if (c <= '\u001f' || c >= '\u007f') {
return true
}
// Check for the characters mentioned in the WHATWG Host parsing spec:
// U+0000, U+0009, U+000A, U+000D, U+0020, "#", "%", "/", ":", "?", "@", "[", "\", and "]"
// (excluding the characters covered above).
if (" #%/:?@[\\]".indexOf(c) != -1) {
return true
}
}
return false
}
/** Decodes an IPv6 address like 1111:2222:3333:4444:5555:6666:7777:8888 or ::1. */
internal fun decodeIpv6(input: String, pos: Int, limit: Int): ByteArray? {
val address = ByteArray(16)
var b = 0
var compress = -1
var groupOffset = -1
var i = pos
while (i < limit) {
if (b == address.size) return null // Too many groups.
// Read a delimiter.
if (i + 2 <= limit && input.startsWith("::", startIndex = i)) {
// Compression "::" delimiter, which is anywhere in the input, including its prefix.
if (compress != -1) return null // Multiple "::" delimiters.
i += 2
b += 2
compress = b
if (i == limit) break
} else if (b != 0) {
// Group separator ":" delimiter.
if (input.startsWith(":", startIndex = i)) {
i++
} else if (input.startsWith(".", startIndex = i)) {
// If we see a '.', rewind to the beginning of the previous group and parse as IPv4.
if (!decodeIpv4Suffix(input, groupOffset, limit, address, b - 2)) return null
b += 2 // We rewound two bytes and then added four.
break
} else {
return null // Wrong delimiter.
}
}
// Read a group, one to four hex digits.
var value = 0
groupOffset = i
while (i < limit) {
val hexDigit = input[i].parseHexDigit()
if (hexDigit == -1) break
value = (value shl 4) + hexDigit
i++
}
val groupLength = i - groupOffset
if (groupLength == 0 || groupLength > 4) return null // Group is the wrong size.
// We've successfully read a group. Assign its value to our byte array.
address[b++] = (value.ushr(8) and 0xff).toByte()
address[b++] = (value and 0xff).toByte()
}
// All done. If compression happened, we need to move bytes to the right place in the
// address. Here's a sample:
//
// input: "1111:2222:3333::7777:8888"
// before: { 11, 11, 22, 22, 33, 33, 00, 00, 77, 77, 88, 88, 00, 00, 00, 00 }
// compress: 6
// b: 10
// after: { 11, 11, 22, 22, 33, 33, 00, 00, 00, 00, 00, 00, 77, 77, 88, 88 }
//
if (b != address.size) {
if (compress == -1) return null // Address didn't have compression or enough groups.
address.copyInto(address, address.size - (b - compress), compress, b)
address.fill(0.toByte(), compress, compress + (address.size - b))
}
return address
}
/** Decodes an IPv4 address suffix of an IPv6 address, like 1111::5555:6666:192.168.0.1. */
internal fun decodeIpv4Suffix(
input: String,
pos: Int,
limit: Int,
address: ByteArray,
addressOffset: Int
): Boolean {
var b = addressOffset
var i = pos
while (i < limit) {
if (b == address.size) return false // Too many groups.
// Read a delimiter.
if (b != addressOffset) {
if (input[i] != '.') return false // Wrong delimiter.
i++
}
// Read 1 or more decimal digits for a value in 0..255.
var value = 0
val groupOffset = i
while (i < limit) {
val c = input[i]
if (c < '0' || c > '9') break
if (value == 0 && groupOffset != i) return false // Reject unnecessary leading '0's.
value = value * 10 + c.code - '0'.code
if (value > 255) return false // Value out of range.
i++
}
val groupLength = i - groupOffset
if (groupLength == 0) return false // No digits.
// We've successfully read a byte.
address[b++] = value.toByte()
}
// Check for too few groups. We wanted exactly four.
return b == addressOffset + 4
}
/** Encodes an IPv6 address in canonical form according to RFC 5952. */
internal fun inet6AddressToAscii(address: ByteArray): String {
// Go through the address looking for the longest run of 0s. Each group is 2-bytes.
// A run must be longer than one group (section 4.2.2).
// If there are multiple equal runs, the first one must be used (section 4.2.3).
var longestRunOffset = -1
var longestRunLength = 0
run {
var i = 0
while (i < address.size) {
val currentRunOffset = i
while (i < 16 && address[i].toInt() == 0 && address[i + 1].toInt() == 0) {
i += 2
}
val currentRunLength = i - currentRunOffset
if (currentRunLength > longestRunLength && currentRunLength >= 4) {
longestRunOffset = currentRunOffset
longestRunLength = currentRunLength
}
i += 2
}
}
// Emit each 2-byte group in hex, separated by ':'. The longest run of zeroes is "::".
val result = Buffer()
var i = 0
while (i < address.size) {
if (i == longestRunOffset) {
result.writeByte(':'.code)
i += longestRunLength
if (i == 16) result.writeByte(':'.code)
} else {
if (i > 0) result.writeByte(':'.code)
val group = address[i] and 0xff shl 8 or (address[i + 1] and 0xff)
result.writeHexadecimalUnsignedLong(group.toLong())
i += 2
}
}
return result.readUtf8()
}
