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Extending IpAddress class with method to return the scope of any given ip-address #187

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Merged
lguohan merged 2 commits into from
Feb 15, 2018
Merged

Extending IpAddress class with method to return the scope of any given ip-address #187

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69f5d0d
Extending IpAddress class with method to return the scope of any give…
Feb 13, 2018
d03f43d
Reducing scope of auxiliar variables.
Feb 14, 2018
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42 changes: 42 additions & 0 deletions common/ipaddress.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -37,3 +37,45 @@ std::string IpAddress::to_string() const

return ipStr;
}

IpAddress::AddrScope IpAddress::getAddrScope() const
{
/* Auxiliary prefixes used to determine the scope of any given address */
static const IpAddress ipv4LinkScopeAddress = IpAddress("169.254.0.0");
static const IpAddress ipv6LinkScopeAddress = IpAddress("FE80::0");
static const IpAddress ipv4HostScopeAddress = IpAddress("127.0.0.1");
static const IpAddress ipv6HostScopeAddress = IpAddress("::1");

if (isV4())
{
const uint32_t ip1 = htonl(getV4Addr());
const uint32_t ip2 = htonl(ipv4LinkScopeAddress.getV4Addr());

/* IPv4 local-scope mask is 16 bits long -- mask = 0xffff0000 */
if ((ip1 & 0xffff0000) == ip2)
{
return LINK_SCOPE;
}
else if (*this == ipv4HostScopeAddress)
{
return HOST_SCOPE;
}
}
else
{
const uint8_t *ip1 = getV6Addr();
const uint8_t *ip2 = ipv6LinkScopeAddress.getV6Addr();

/* IPv6 local-scope mask is 10 bits long -- mask = 0xffc0::0 */
if ((ip1[0] == ip2[0]) && ((ip1[1] & 0xc0) == ip2[1]))
{
return LINK_SCOPE;
}
else if (*this == ipv6HostScopeAddress)
{
return HOST_SCOPE;
}
}

return GLOBAL_SCOPE;
}
8 changes: 8 additions & 0 deletions common/ipaddress.h
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Original file line number Diff line number Diff line change
Expand Up @@ -74,6 +74,14 @@ class IpAddress

std::string to_string() const;

enum AddrScope {
GLOBAL_SCOPE,
LINK_SCOPE,
HOST_SCOPE
};

IpAddress::AddrScope getAddrScope() const;

private:
struct ip_addr_t m_ip;
};
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39 changes: 39 additions & 0 deletions tests/ipaddress_ut.cpp
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Expand Up @@ -33,3 +33,42 @@ TEST(IpAddresses, contains)
EXPECT_TRUE(ips.contains(ips_1));
EXPECT_FALSE(ips.contains(ips_2));
}

TEST(IpAddress, getAddrScope)
{
// IPv4 prefixes
IpAddress ip1("0.0.0.0");
IpAddress ip2("169.1.1.1");
IpAddress ip3("169.254.0.1");
IpAddress ip4("169.254.255.255");
IpAddress ip5("169.253.1.1");
IpAddress ip6("169.255.1.1");
IpAddress ip7("127.0.0.1");

// IPv6 prefixes
IpAddress ip11("2001:4898:f0:f153:357c:77b2:49c9:627c");
IpAddress ip12("fe80::1");
IpAddress ip13("fe80:1:1:1:1:1:1:1");
IpAddress ip14("fe99::1");
IpAddress ip15("feb0:1::1");
IpAddress ip16("febf:1::1");
IpAddress ip17("fec0:1::1");
IpAddress ip18("::1");

EXPECT_EQ(IpAddress::AddrScope::GLOBAL_SCOPE, ip1.getAddrScope());
EXPECT_EQ(IpAddress::AddrScope::GLOBAL_SCOPE, ip2.getAddrScope());
EXPECT_EQ(IpAddress::AddrScope::LINK_SCOPE, ip3.getAddrScope());
EXPECT_EQ(IpAddress::AddrScope::LINK_SCOPE, ip4.getAddrScope());
EXPECT_EQ(IpAddress::AddrScope::GLOBAL_SCOPE, ip5.getAddrScope());
EXPECT_EQ(IpAddress::AddrScope::GLOBAL_SCOPE, ip6.getAddrScope());
EXPECT_EQ(IpAddress::AddrScope::HOST_SCOPE, ip7.getAddrScope());

EXPECT_EQ(IpAddress::AddrScope::GLOBAL_SCOPE, ip11.getAddrScope());
EXPECT_EQ(IpAddress::AddrScope::LINK_SCOPE, ip12.getAddrScope());
EXPECT_EQ(IpAddress::AddrScope::LINK_SCOPE, ip13.getAddrScope());
EXPECT_EQ(IpAddress::AddrScope::LINK_SCOPE, ip14.getAddrScope());
EXPECT_EQ(IpAddress::AddrScope::LINK_SCOPE, ip15.getAddrScope());
EXPECT_EQ(IpAddress::AddrScope::LINK_SCOPE, ip16.getAddrScope());
EXPECT_EQ(IpAddress::AddrScope::GLOBAL_SCOPE, ip17.getAddrScope());
EXPECT_EQ(IpAddress::AddrScope::HOST_SCOPE, ip18.getAddrScope());
}