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util: new virSocketAddrIsPrivate function

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This new function returns true if the given address is in the range of
any "private" or "local" networks as defined in RFC1918 (IPv4) or
RFC3484/RFC4193 (IPv6), otherwise they return false.

These ranges are:

   192.168.0.0/16
   172.16.0.0/16
   10.0.0.0/24
   FC00::/7
   FEC0::/10
This commit is contained in:
Laine Stump 2012-11-21 21:17:30 -05:00
parent c1bbfabd04
commit 337efad95e
3 changed files with 37 additions and 2 deletions
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1
src/libvirt_private.syms
View File

@ -1738,6 +1738,7 @@ virSocketAddrFormatFull;
virSocketAddrGetPort;
virSocketAddrGetRange;
virSocketAddrIsNetmask;
virSocketAddrIsPrivate;
virSocketAddrMask;
virSocketAddrMaskByPrefix;
virSocketAddrParse;

35
src/util/virsocketaddr.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2009-2011 Red Hat, Inc.
* Copyright (C) 2009-2012 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -193,6 +193,39 @@ virSocketAddrEqual(const virSocketAddrPtr s1, const virSocketAddrPtr s2)
return false;
}
/*
* virSocketAddrIsPrivate:
* @s: the location of the IP address
*
* Return true if this address is in its family's defined
* "private/local" address space. For IPv4, private addresses are in
* the range of 192.168.0.0/16, 172.16.0.0/16, or 10.0.0.0/8. For
* IPv6, local addresses are in the range of FC00::/7 or FEC0::/10
* (that last one is deprecated, but still in use).
*
* See RFC1918, RFC3484, and RFC4193 for details.
*/
bool
virSocketAddrIsPrivate(const virSocketAddrPtr addr)
{
unsigned long val;
switch (addr->data.stor.ss_family) {
case AF_INET:
val = ntohl(addr->data.inet4.sin_addr.s_addr);
return ((val & 0xFFFF0000) == ((192L << 24) + (168 << 16)) ||
(val & 0xFFFF0000) == ((172L << 24) + (16 << 16)) ||
(val & 0xFF000000) == ((10L << 24)));
case AF_INET6:
return ((addr->data.inet6.sin6_addr.s6_addr[0] & 0xFE) == 0xFC ||
((addr->data.inet6.sin6_addr.s6_addr[0] & 0xFF) == 0xFE &&
(addr->data.inet6.sin6_addr.s6_addr[1] & 0xC0) == 0xC0));
}
return false;
}
/*
* virSocketAddrFormat:
* @addr: an initialized virSocketAddrPtr

3
src/util/virsocketaddr.h
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2009-2011 Red Hat, Inc.
* Copyright (C) 2009-2012 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -104,5 +104,6 @@ int virSocketAddrPrefixToNetmask(unsigned int prefix,
int family);
bool virSocketAddrEqual(const virSocketAddrPtr s1,
const virSocketAddrPtr s2);
bool virSocketAddrIsPrivate(const virSocketAddrPtr addr);
#endif /* __VIR_SOCKETADDR_H__ */