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| author | 6543 <6543@obermui.de> | 2021-03-22 21:16:27 +0000 |
|---|---|---|
| committer | Emmanuel Odeke <emmanuel@orijtech.com> | 2021-03-22 21:35:40 +0000 |
| commit | 1c9e587b90172e7654db897d8c938ffc665e1673 (patch) | |
| tree | 9e3f10e17a81e7cfd042003b80c05e1da3d1ae70 | |
| parent | d9691ffa37820e2a7e70679164eac29c675874b2 (diff) | |
| download | go-1c9e587b90172e7654db897d8c938ffc665e1673.tar.gz go-1c9e587b90172e7654db897d8c938ffc665e1673.zip | |
net: add IP.IsPrivate
Adds a new method IsPrivate to check if an IP is
private according to RFC 1918 & RFC 4193.
Fixes #29146
Change-Id: If77b9e1746d86029df66ae9f18437b1f65a18b59
GitHub-Last-Rev: 09f4ba75988c87b90550d071866ab1d6634ef681
GitHub-Pull-Request: golang/go#42793
Reviewed-on: https://go-review.googlesource.com/c/go/+/272668
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Go Bot <gobot@golang.org>
| -rw-r--r-- | src/net/ip.go | 21 | ||||
| -rw-r--r-- | src/net/ip_test.go | 22 |
2 files changed, 43 insertions, 0 deletions
diff --git a/src/net/ip.go b/src/net/ip.go index 18e3f3a2f5..da51dab800 100644 --- a/src/net/ip.go +++ b/src/net/ip.go @@ -128,6 +128,27 @@ func (ip IP) IsLoopback() bool { return ip.Equal(IPv6loopback) } +// IsPrivate reports whether ip is a private address, according to +// RFC 1918 (IPv4 addresses) and RFC 4193 (IPv6 addresses). +func (ip IP) IsPrivate() bool { + if ip4 := ip.To4(); ip4 != nil { + // Following RFC 4193, Section 3. Local IPv6 Unicast Addresses which says: + // The Internet Assigned Numbers Authority (IANA) has reserved the + // following three blocks of the IPv4 address space for private internets: + // 10.0.0.0 - 10.255.255.255 (10/8 prefix) + // 172.16.0.0 - 172.31.255.255 (172.16/12 prefix) + // 192.168.0.0 - 192.168.255.255 (192.168/16 prefix) + return ip4[0] == 10 || + (ip4[0] == 172 && ip4[1]&0xf0 == 16) || + (ip4[0] == 192 && ip4[1] == 168) + } + // Following RFC 4193, Section 3. Private Address Space which says: + // The Internet Assigned Numbers Authority (IANA) has reserved the + // following block of the IPv6 address space for local internets: + // FC00:: - FDFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF (FC00::/7 prefix) + return len(ip) == IPv6len && ip[0]&0xfe == 0xfc +} + // IsMulticast reports whether ip is a multicast address. func (ip IP) IsMulticast() bool { if ip4 := ip.To4(); ip4 != nil { diff --git a/src/net/ip_test.go b/src/net/ip_test.go index 1e09ae9db4..3af5e41ceb 100644 --- a/src/net/ip_test.go +++ b/src/net/ip_test.go @@ -691,6 +691,28 @@ var ipAddrScopeTests = []struct { {IP.IsGlobalUnicast, IP{0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false}, {IP.IsGlobalUnicast, IP{0xff, 0x05, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false}, {IP.IsGlobalUnicast, nil, false}, + {IP.IsPrivate, nil, false}, + {IP.IsPrivate, IPv4(1, 1, 1, 1), false}, + {IP.IsPrivate, IPv4(9, 255, 255, 255), false}, + {IP.IsPrivate, IPv4(10, 0, 0, 0), true}, + {IP.IsPrivate, IPv4(10, 255, 255, 255), true}, + {IP.IsPrivate, IPv4(11, 0, 0, 0), false}, + {IP.IsPrivate, IPv4(172, 15, 255, 255), false}, + {IP.IsPrivate, IPv4(172, 16, 0, 0), true}, + {IP.IsPrivate, IPv4(172, 16, 255, 255), true}, + {IP.IsPrivate, IPv4(172, 23, 18, 255), true}, + {IP.IsPrivate, IPv4(172, 31, 255, 255), true}, + {IP.IsPrivate, IPv4(172, 31, 0, 0), true}, + {IP.IsPrivate, IPv4(172, 32, 0, 0), false}, + {IP.IsPrivate, IPv4(192, 167, 255, 255), false}, + {IP.IsPrivate, IPv4(192, 168, 0, 0), true}, + {IP.IsPrivate, IPv4(192, 168, 255, 255), true}, + {IP.IsPrivate, IPv4(192, 169, 0, 0), false}, + {IP.IsPrivate, IP{0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, false}, + {IP.IsPrivate, IP{0xfc, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, true}, + {IP.IsPrivate, IP{0xfc, 0xff, 0x12, 0, 0, 0, 0, 0x44, 0, 0, 0, 0, 0, 0, 0, 0}, true}, + {IP.IsPrivate, IP{0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, true}, + {IP.IsPrivate, IP{0xfe, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, false}, } func name(f interface{}) string { |