X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=folly%2FIPAddressV6.cpp;h=5607a4bfcb37e61eef7d7f7b2e177a9594a4426a;hb=1d11ad7a0af6277ca6ed2ad147ac16a2e7ac3760;hp=915767b493d9a620b21e89780ee203150eac3c9a;hpb=ac31e5f5e80027418cb06a7718b6ade3cacad8bc;p=folly.git

diff --git a/folly/IPAddressV6.cpp b/folly/IPAddressV6.cpp
index 915767b4..5607a4bf 100644
--- a/folly/IPAddressV6.cpp
+++ b/folly/IPAddressV6.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,6 +23,7 @@
 #include <folly/IPAddress.h>
 #include <folly/IPAddressV4.h>
 #include <folly/MacAddress.h>
+#include <folly/detail/IPAddressSource.h>
 
 using std::ostream;
 using std::string;
@@ -48,6 +49,20 @@ void toAppend(IPAddressV6 addr, fbstring* result) {
   result->append(addr.str());
 }
 
+bool IPAddressV6::validate(StringPiece ip) {
+  if (ip.size() > 0 && ip.front() == '[' && ip.back() == ']') {
+    ip = ip.subpiece(1, ip.size() - 2);
+  }
+
+  constexpr size_t kStrMaxLen = INET6_ADDRSTRLEN;
+  std::array<char, kStrMaxLen + 1> ip_cstr;
+  const size_t len = std::min(ip.size(), kStrMaxLen);
+  std::memcpy(ip_cstr.data(), ip.data(), len);
+  ip_cstr[len] = 0;
+  struct in6_addr addr;
+  return 1 == inet_pton(AF_INET6, ip_cstr.data(), &addr);
+}
+
 // public default constructor
 IPAddressV6::IPAddressV6() {
 }
@@ -58,8 +73,8 @@ IPAddressV6::IPAddressV6(StringPiece addr) {
 
   // Allow addresses surrounded in brackets
   if (ip.size() < 2) {
-    throw IPAddressFormatException("Invalid IPv6 address '", ip,
-                                   "': address too short");
+    throw IPAddressFormatException(
+        to<std::string>("Invalid IPv6 address '", ip, "': address too short"));
   }
   if (ip.front() == '[' && ip.back() == ']') {
     ip = ip.substr(1, ip.size() - 2);
@@ -74,10 +89,11 @@ IPAddressV6::IPAddressV6(StringPiece addr) {
   if (!getaddrinfo(ip.c_str(), nullptr, &hints, &result)) {
     struct sockaddr_in6* ipAddr = (struct sockaddr_in6*)result->ai_addr;
     addr_.in6Addr_ = ipAddr->sin6_addr;
-    scope_ = ipAddr->sin6_scope_id;
+    scope_ = uint16_t(ipAddr->sin6_scope_id);
     freeaddrinfo(result);
   } else {
-    throw IPAddressFormatException("Invalid IPv6 address '", ip, "'");
+    throw IPAddressFormatException(
+        to<std::string>("Invalid IPv6 address '", ip, "'"));
   }
 }
 
@@ -90,7 +106,7 @@ IPAddressV6::IPAddressV6(const in6_addr& src)
 // sockaddr_in6 constructor
 IPAddressV6::IPAddressV6(const sockaddr_in6& src)
   : addr_(src.sin6_addr)
-  , scope_(src.sin6_scope_id)
+  , scope_(uint16_t(src.sin6_scope_id))
 {
 }
 
@@ -110,7 +126,7 @@ IPAddressV6::AddressStorage::AddressStorage(MacAddress mac) {
   // See RFC 4291 sections 2.5.1, 2.5.6, and Appendix A
   const auto* macBytes = mac.bytes();
   memcpy(&bytes_.front(), "\xfe\x80\x00\x00\x00\x00\x00\x00", 8);
-  bytes_[8] = macBytes[0] ^ 0x02;
+  bytes_[8] = uint8_t(macBytes[0] ^ 0x02);
   bytes_[9] = macBytes[1];
   bytes_[10] = macBytes[2];
   bytes_[11] = 0xff;
@@ -120,10 +136,38 @@ IPAddressV6::AddressStorage::AddressStorage(MacAddress mac) {
   bytes_[15] = macBytes[5];
 }
 
+Optional<MacAddress> IPAddressV6::getMacAddressFromLinkLocal() const {
+  // Returned MacAddress must be constructed from a link-local IPv6 address.
+  if (!(addr_.bytes_[0] == 0xfe && addr_.bytes_[1] == 0x80 &&
+        addr_.bytes_[2] == 0x00 && addr_.bytes_[3] == 0x00 &&
+        addr_.bytes_[4] == 0x00 && addr_.bytes_[5] == 0x00 &&
+        addr_.bytes_[6] == 0x00 && addr_.bytes_[7] == 0x00 &&
+        addr_.bytes_[11] == 0xff && addr_.bytes_[12] == 0xfe)) {
+    return folly::none;
+  }
+  // The link-local address uses modified EUI-64 format,
+  // See RFC 4291 sections 2.5.1, 2.5.6, and Appendix A
+  std::array<uint8_t, MacAddress::SIZE> bytes;
+  // Step 1: first 8 bytes are fe:80:00:00:00:00:00:00, and can be stripped
+  // Step 2: invert the universal/local (U/L) flag (bit 7)
+  bytes[0] = addr_.bytes_[8] ^ 0x02;
+  // Step 3: copy thhese bytes are they are
+  bytes[1] = addr_.bytes_[9];
+  bytes[2] = addr_.bytes_[10];
+  // Step 4: strip bytes (0xfffe), which are bytes_[11] and bytes_[12]
+  // Step 5: copy the rest.
+  bytes[3] = addr_.bytes_[13];
+  bytes[4] = addr_.bytes_[14];
+  bytes[5] = addr_.bytes_[15];
+  return Optional<MacAddress>(MacAddress::fromBinary(range(bytes)));
+}
+
 void IPAddressV6::setFromBinary(ByteRange bytes) {
   if (bytes.size() != 16) {
-    throw IPAddressFormatException("Invalid IPv6 binary data: length must "
-                                   "be 16 bytes, got ", bytes.size());
+    throw IPAddressFormatException(to<std::string>(
+        "Invalid IPv6 binary data: length must ",
+        "be 16 bytes, got ",
+        bytes.size()));
   }
   memcpy(&addr_.in6Addr_.s6_addr, bytes.data(), sizeof(in6_addr));
   scope_ = 0;
@@ -140,7 +184,7 @@ IPAddressV4 IPAddressV6::createIPv4() const {
 
 // convert two uint8_t bytes into a uint16_t as hibyte.lobyte
 static inline uint16_t unpack(uint8_t lobyte, uint8_t hibyte) {
-  return ((uint16_t)hibyte << 8) | (uint16_t)lobyte;
+  return uint16_t((uint16_t(hibyte) << 8) | lobyte);
 }
 
 // given a src string, unpack count*2 bytes into dest
@@ -238,8 +282,8 @@ bool IPAddressV6::inSubnet(StringPiece cidrNetwork) const {
   auto subnetInfo = IPAddress::createNetwork(cidrNetwork);
   auto addr = subnetInfo.first;
   if (!addr.isV6()) {
-    throw IPAddressFormatException("Address '", addr.toJson(), "' ",
-                                   "is not a V6 address");
+    throw IPAddressFormatException(to<std::string>(
+        "Address '", addr.toJson(), "' ", "is not a V6 address"));
   }
   return inSubnetWithMask(addr.asV6(), fetchMask(subnetInfo.second));
 }
@@ -297,12 +341,12 @@ bool IPAddressV6::isMulticast() const {
 
 uint8_t IPAddressV6::getMulticastFlags() const {
   DCHECK(isMulticast());
-  return ((addr_.bytes_[1] >> 4) & 0xf);
+  return uint8_t((addr_.bytes_[1] >> 4) & 0xf);
 }
 
 uint8_t IPAddressV6::getMulticastScope() const {
   DCHECK(isMulticast());
-  return (addr_.bytes_[1] & 0xf);
+  return uint8_t(addr_.bytes_[1] & 0xf);
 }
 
 IPAddressV6 IPAddressV6::getSolicitedNodeAddress() const {
@@ -322,8 +366,8 @@ IPAddressV6 IPAddressV6::getSolicitedNodeAddress() const {
 IPAddressV6 IPAddressV6::mask(size_t numBits) const {
   static const auto bits = bitCount();
   if (numBits > bits) {
-    throw IPAddressFormatException("numBits(", numBits, ") > bitCount(",
-                                   bits, ")");
+    throw IPAddressFormatException(
+        to<std::string>("numBits(", numBits, ") > bitCount(", bits, ")"));
   }
   ByteArray16 ba = detail::Bytes::mask(fetchMask(numBits), addr_.bytes_);
   return IPAddressV6(ba);
@@ -340,8 +384,11 @@ string IPAddressV6::str() const {
     string ip(buffer);
     return ip;
   } else {
-    throw IPAddressFormatException("Invalid address with hex ",
-                                   "'", detail::Bytes::toHex(bytes(), 16), "'");
+    throw IPAddressFormatException(to<std::string>(
+        "Invalid address with hex ",
+        "'",
+        detail::Bytes::toHex(bytes(), 16),
+        "'"));
   }
 }
 
@@ -363,7 +410,7 @@ uint8_t IPAddressV6::getNthMSByte(size_t byteIndex) const {
 
 // protected
 const ByteArray16 IPAddressV6::fetchMask(size_t numBits) {
-  static const uint8_t bits = bitCount();
+  static const size_t bits = bitCount();
   if (numBits > bits) {
     throw IPAddressFormatException("IPv6 addresses are 128 bits.");
   }
@@ -371,6 +418,15 @@ const ByteArray16 IPAddressV6::fetchMask(size_t numBits) {
   return masks_[numBits];
 }
 
+// public static
+CIDRNetworkV6 IPAddressV6::longestCommonPrefix(
+    const CIDRNetworkV6& one,
+    const CIDRNetworkV6& two) {
+  auto prefix = detail::Bytes::longestCommonPrefix(
+      one.first.addr_.bytes_, one.second, two.first.addr_.bytes_, two.second);
+  return {IPAddressV6(prefix.first), prefix.second};
+}
+
 // protected
 bool IPAddressV6::inBinarySubnet(const std::array<uint8_t, 2> addr,
                                  size_t numBits) const {