Provided by: libbobcat-dev_6.04.00-1ubuntu3_amd64 
NAME
FBB::Cidr - Compares IP4 addresses to CIDR specifications
SYNOPSIS
#include <bobcat/cidr>
Linking option: -lbobcat
DESCRIPTION
Objects of the class Cidr can be used for testing whether IP4 Internet addresses belong to address ranges
defined by Classless Inter-Domain Routing (CIDR) address block specifications. CIDR blocks are specified
as a.b.c.d/m where a.b.c.d are the four octets of a dotted decimal IP4 address specification (e.g.,
129.125.14.80) and m is a mask-size (ranging from 0 to 32) defining the number of most significant bits
to remain as-is. The CIDR specification 129.125.14.80/16 defines a class B network, with addresses
ranging from 129.125.0.0 to 129.125.255.255.
The mask size does not have to be a multiple of 8. E.g., when specifying 129.125.14.80/5 only the most
significant 5 bits of the first octed are fixed, resulting in an address range ranging from 128.0.0.0 to
135.255.255.255.
CIDR specifications passed to a Cidr object must be of the form a.b.c.d or a.b.c.d/m. If the mask is not
specified a mask-size of 32 is used, effectively defining an address range of only one address. Mask
values of 0 are ignored. Mask values of 0 are ignored by Cidr objects.
When specifying CIDRs on a stream, empty lines and comment lines (having a hash-character (#) as their
first non-blank character) are ignored. Non-empty lines must start with a CIDR specification, and the
Cidr object will ignore all information on a line trailing a CIDR specification.
NAMESPACE
FBB
All constructors, members, operators and manipulators, mentioned in this man-page, are defined in the
namespace FBB.
INHERITS FROM
-
CONSTRUCTORS
o Cidr(std::string const &cidrPattern):
The Cidr object is initialized with a single CIDR specification.
o Cidr(std::istream &cidrStream):
The Cidr object is initialized with CIDR specifications read from the std::istream cidrStream.
Default, copy and move constructors and the copy and move assignment operators are available.
MEMBER FUNCTIONS
The return valuess of the accessors (i.e., the const members) are only defined following a successful
match (see below, the match members).
o std::string const &address() const:
returns the address matching a CIDR.
o std::string cidr() const:
returns the CIDR containing a specified address.
o std::string first() const:
returns the first address of the range of addresses defined by the CIDR specification.
o std::string last() const:
returns the last address of the range of addresses defined by the CIDR specification. Note that
first, last do not define an iterator range. The address returned by last still belongs to the
CIDR-range.
o bool match(std::istream &in):
The value true is returned when an IP4 address found in the lines of in belongs to a CIDR range
inspected by the Cidr object. The match function returns true at the first matching address.
E.g., if a line contains the text
This is address 1.2.3.4 and this is 5.6.7.8
and the CIDR specifications
5.1.1.1/8
1.2.1.1/16
were provided to the Cidr object, then the object will report a match for 5.6.7.8.
As soon as a match is found match returns true. If none of the addresses found in the lines of in
matches any of the object’s CIDR specifications, false is returned.
o std::string mask() const:
returns the mask used by the CIDR specification.
o bool match(std::string const &line):
The value true is returned when an IP4 address found in line belongs to a CIDR range inspected by
the Cidr object. The match function returns true at the first matching address.
If none of the addresses found in line matches any of the object’s CIDR specifications, false is
returned.
o void setCidr(std::istream &cidrStream):
A new set of CIDR specification is loaded into the Cidr object, reading the specifications from
cidrStream.
o void setCidr(std::string const &cidrPattern):
A new CIDR specification is loaded into the Cidr object, using the specification found in
cidrPattern. The Cidr object is initialized with a single CIDR specification which must be of the
form a.b.c.d or a.b.c.d/m. If the mask is not specified a mask-size of 32 is used, effectively
defining an address range of only one address. Mask values of 0 are ignored.
o void swap(Cidr &other):
The current and other object are swapped.
STATIC MEMBERS
o size_t dotted2binary(std::string const &dotted):
Converts "a.b.c.d" to a 32-bits value
o std::string binary2dotted(size_t binary):
Converts a 32-bits value to a dotted decimal IP4 address
EXAMPLE
#include <fstream>
#include <iostream>
#include <bobcat/exception>
#ifdef BOBCAT
#include <bobcat/cidr>
#else
#include "cidr"
#endif
using namespace std;
using namespace FBB;
int main(int argc, char **argv)
{
enum Spec
{
NONE,
FILE,
CIN
};
Spec spec = CIN;
ifstream in;
if (argc > 1)
{
Exception::open(in, argv[1]); // file containing cidr-specs
spec = FILE;
}
while (true)
{
string cidrSpec;
if (spec == CIN)
{
cout << "Specify cidr (empty to quit): ";
if (!getline(cin, cidrSpec) || cidrSpec.empty())
break;
}
try
{
Cidr cidr;
switch (spec)
{
case NONE:
return 0;
case FILE:
cidr.setCidr(in);
spec = NONE;
break;
case CIN:
cidr.setCidr(cidrSpec);
}
while (true)
{
cout << "Specify address to test (empty to " <<
(spec == CIN ? "respec. CIDR" : "quit") << "): ";
string address;
if (!getline(cin, address) || address.empty())
break;
if (!cidr.match(address))
{
cout << "Address " << address << " not in ";
if (spec == CIN)
cout << cidrSpec << ’\n’;
else
cout << "specifications in " << argv[1] << ’\n’;
}
else
cout << "Address " << address << " in " << cidr.cidr() <<
"\n"
"Lowest address: " << cidr.first() << "\n"
"Highest address: " << cidr.last() << "\n"
"CIDR mask: " << cidr.mask() << "\n"
"Address: " << cidr.address() << ’\n’;
}
}
catch (exception const &err)
{
cout << "Oops... " << err.what() << "\n"
"Try again...\n";
}
}
}
FILES
bobcat/cidr - defines the class interface
SEE ALSO
bobcat(7)
BUGS
Members of Cidr use static data. The current implementation of Cidr is therefore not thread-safe.
BOBCAT PROJECT FILES
o https://fbb-git.gitlab.io/bobcat/: gitlab project page;
o bobcat_6.04.00-x.dsc: detached signature;
o bobcat_6.04.00-x.tar.gz: source archive;
o bobcat_6.04.00-x_i386.changes: change log;
o libbobcat1_6.04.00-x_*.deb: debian package containing the libraries;
o libbobcat1-dev_6.04.00-x_*.deb: debian package containing the libraries, headers and manual pages;
BOBCAT
Bobcat is an acronym of `Brokken’s Own Base Classes And Templates’.
COPYRIGHT
This is free software, distributed under the terms of the GNU General Public License (GPL).
AUTHOR
Frank B. Brokken (f.b.brokken@rug.nl).
libbobcat-dev_6.04.00 2005-2023 FBB::Cidr(3bobcat)