コミット: 6ef79e378e58aa3a729278cfd88ba86d60a7cf89 - py_ipv6_info (hg)

A small utility to fetch information about IPv6 addresses and possibly also any associated IPv4 address.

コミットメタ情報

• リビジョン: 6ef79e378e58aa3a729278cfd88ba86d60a7cf89 (tree)
• 日時: 2013-02-27 02:19:18
• 作者: Eric Hopper <hopper@omni...>
• コミッター: Eric Hopper

ログメッセージ

Initial script checkin. Could probably use a distutils setup.py.

変更サマリ

• add: py_ipv6_info

差分

diff -r 000000000000 -r 6ef79e378e58 py_ipv6_info
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/py_ipv6_info	Tue Feb 26 09:19:18 2013 -0800
@@ -0,0 +1,129 @@
+#!/usr/bin/python
+
+import socket
+import sys
+import struct
+import dns.reversename
+import dns.resolver
+import dns.exception
+import dns.rdatatype as dnstype
+
+TYPE_6TO4 = 0
+TYPE_TEREDOSERVER = 1
+TYPE_TEREDONAT = 2
+TYPE_PLAINIPv4 = 3
+
+class BadAddress(RuntimeError):
+    def __init__(self, addr):
+        super(BadAddress, self).__init__(
+            "I'm expecting a numeric IPv4 or IPv6 address, got %s", (addr,), addr
+            )
+        self.addr = addr
+
+def analyze_addr(s):
+    try:
+        raw = socket.inet_pton(socket.AF_INET, s)
+        return analyze_ipv4(s, raw, TYPE_PLAINIPv4)
+    except socket.error:
+        pass
+    try:
+        raw = socket.inet_pton(socket.AF_INET6, s)
+        return analyze_ipv6(s, raw)
+    except socket.error:
+        pass
+    raise BadAddress(s)
+
+def analyze_ipv4(s, raw, addrtype):
+    numaddr = struct.unpack('!L', raw)[0]
+    print "Got IPv4 address: %s\n  - in raw hex 0x%08x" % (s, numaddr)
+    if addrtype == TYPE_TEREDONAT:
+        print "  - in obfuscated hex 0x%08x" % (numaddr ^ 0xffffffff,)
+    canon = socket.inet_ntop(socket.AF_INET, raw)
+    if canon != s:
+        print "  - Canonical %s" % (canon,)
+    else:
+        canon = s
+    revname = dns.reversename.from_address(canon)
+    answer = None
+    try:
+        answer = dns.resolver.query(revname, 'PTR')
+    except dns.exception.DNSException:
+        pass
+    if addrtype == TYPE_6TO4:
+        print "  - The 6to4 IPv6 prefix is 2002:%x:%x::/48" % \
+            (numaddr >> 16, numaddr & 0xffff)
+    while (answer is None) and (len(revname) > 4):
+        revname = revname.parent()
+        try:
+            answer = dns.resolver.query(revname, 'NS')
+        except dns.exception.DNSException:
+            pass
+    if answer is None:
+        print "  - *** Reverse lookup failed for %s ***" % (revname,)
+    else:
+        if len(revname) != 7:
+            print "  - *** The initial PTR lookup failed ***"
+        print "  - %s" % (revname,)
+        for result in answer.rrset:
+            print "    - %s: %s" % (dnstype.to_text(result.rdtype), result)
+
+def analyze_ipv6(s, raw):
+    numaddr = struct.unpack('!QQ', raw)
+    numaddr = numaddr[0] * 2**64 + numaddr[1]
+    print "Got IPv6 address: %s\n  - in raw hex 0x%016x" % (s, numaddr)
+    canon = socket.inet_ntop(socket.AF_INET6, raw)
+    if canon != s:
+        print "  - Canonical %s" % (canon,)
+    else:
+        canon = s
+    if ((numaddr >> 125) & 0x7) != 1:
+        print "  - === Not a globally routable address"
+        return
+    revname = dns.reversename.from_address(canon)
+    answer = None
+    try:
+        answer = dns.resolver.query(revname, 'PTR')
+    except dns.exception.DNSException:
+        pass
+    while (answer is None) and (len(revname) > 7):
+        revname = revname.parent()
+        try:
+            answer = dns.resolver.query(revname, 'NS')
+        except dns.exception.DNSException:
+            pass
+    if answer is not None:
+        if len(revname) != 35:
+            print "  - *** The initial PTR lookup failed ***"
+        print "  - %s" % (revname,)
+        for result in answer.rrset:
+            print "    - %s: %s" % (dnstype.to_text(result.rdtype), result)
+    else:
+        print "  - *** Unable to reverse lookup any information ***"
+    if (numaddr >> 112) == 0x2002:
+        raw4 = struct.pack('!L', (numaddr >> 80) & 0xffffffff)
+        s4 = socket.inet_ntop(socket.AF_INET, raw4)
+        print "  - 6to4 address %s" % (s4,)
+        print "-+-+-+-"
+        analyze_ipv4(s4, raw4, TYPE_6TO4)
+        print "-+-+-+-"
+    elif (numaddr >> 96) == 0x20010000:
+        rawnat4 = struct.pack('!L', (numaddr & 0xffffffff) ^ 0xffffffff)
+        rawserv4 = struct.pack('!L', (numaddr >> 64) & 0xffffffff)
+        snat4 = socket.inet_ntop(socket.AF_INET, rawnat4)
+        sserv4 = socket.inet_ntop(socket.AF_INET, rawserv4)
+        print "  - Teredo         NAT (the public IPv4 address): %s" % (snat4,)
+        print "  - Teredo server (assigner of the IPv6 address): %s" % (sserv4,)
+        print "-+-+-+- (Teredo NAT (the public IPv4 address of the system))"
+        analyze_ipv4(snat4, rawnat4, TYPE_TEREDONAT)
+        print "-+-+-+- (Teredo server (probably not important))"
+        analyze_ipv4(sserv4, rawserv4, TYPE_TEREDOSERVER)
+
+if __name__ == '__main__':
+    if len(sys.argv) > 1:
+        print "==========="
+    for x in sys.argv[1:]:
+        try:
+            analyze_addr(x)
+        except BadAddress, a:
+            print >>sys.stderr, "%s doesn't appear to be a valid numeric IPv4 or IPv6 address." % (x, )
+        print "==========="