[1186] from_bytes() method implement in IOAddress

- similar to from_string() used in underlying boost::asio::address

src/lib/asiolink/io_address.cc

@@ -54,6 +54,21 @@ IOAddress::toText() const {
     return (asio_address_.to_string());
 }
 
+IOAddress
+IOAddress::from_bytes(short family, const char* data) {
+    static char addr_str[INET6_ADDRSTRLEN];
+    if (data == NULL) {
+        isc_throw(BadValue, "NULL pointer received.");
+    }
+    if ( (family != AF_INET) && (family != AF_INET6) ) {
+        isc_throw(BadValue, "Invalid family type. Only AF_INET and AF_INET6"
+                  << "are supported");
+    }
+
+    inet_ntop(family, data, addr_str,INET6_ADDRSTRLEN);
+    return IOAddress(string(addr_str));
+}
+
 short
 IOAddress::getFamily() const {
     if (asio_address_.is_v4()) {
@@ -63,7 +78,7 @@ IOAddress::getFamily() const {
     }
 }
 
-const asio::ip::address& 
+const asio::ip::address&
 IOAddress::getAddress() const {
     return asio_address_;
 }

src/lib/asiolink/io_address.h

@@ -87,6 +87,16 @@ public:
     /// \return AF_INET for IPv4 or AF_INET6 for IPv6.
     short getFamily() const;
 
+
+    /// \brief Creates an address from over wire data.
+    ///
+    /// \param family AF_NET for IPv4 or AF_NET6 for IPv6.
+    /// \param data pointer to first char of data
+    ///
+    /// \return Created IOAddress object
+    static IOAddress
+    from_bytes(short family, const char* data);
+
     /// \brief Compare addresses for equality
     ///
     /// \param other Address to compare against.

src/lib/asiolink/tests/io_address_unittest.cc

@@ -63,3 +63,23 @@ TEST(IOAddressTest, Family) {
     EXPECT_EQ(AF_INET, IOAddress("192.0.2.1").getFamily());
     EXPECT_EQ(AF_INET6, IOAddress("2001:0DB8:0:0::0012").getFamily());
 }
+
+TEST(IOAddressTest, from_bytes) {
+    // 2001:db8:1::dead:beef
+    char v6[] = {
+        0x20, 0x01, 0x0d, 0xb8, 0x00, 0x01, 0, 0,
+        0, 0, 0, 0, 0xde, 0xad, 0xbe, 0xef };
+
+    char v4[] = { 192, 0 , 2, 3 };
+
+    IOAddress addr("::");
+    EXPECT_NO_THROW({
+        addr = IOAddress::from_bytes(AF_INET6, v6);
+    });
+    EXPECT_EQ("2001:db8:1::dead:beef", addr.toText());
+
+    EXPECT_NO_THROW({
+        addr = IOAddress::from_bytes(AF_INET, v4);
+    });
+    EXPECT_EQ(addr, IOAddress("192.0.2.3"));
+}