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ipsec_initsubnet ()
  • >> ipsec_initsubnet (3) ( Разные man: Библиотечные вызовы )
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    NAME

    ipsec initsubnet - initialize an ip_subnet
    
    ipsec addrtosubnet - initialize a singleton ip_subnet
    ipsec subnettypeof - get address type of an ip_subnet
    ipsec masktocount - convert subnet mask to bit count
    ipsec networkof - get base address of an ip_subnet
    ipsec maskof - get subnet mask of an ip_subnet  

    SYNOPSIS

    #include <freeswan.h>

    const char *initsubnet(const ip_address *addr,
      int maskbits, int clash, ip_subnet *dst);
    const char *addrtosubnet(const ip_address *addr,
      ip_subnet *dst);

    int subnettypeof(const ip_subnet *src);
    int masktocount(const ip_address *src);
    void networkof(const ip_subnet *src, ip_address *dst);
    void maskof(const ip_subnet *src, ip_address *dst);  

    DESCRIPTION

    The <freeswan.h> library uses an internal type ip_subnet to contain a description of an IP subnet (base address plus mask). These functions provide basic tools for creating and examining this type.

    Initsubnet initializes a variable *dst of type ip_subnet from a base address and a count of mask bits. The clash parameter specifies what to do if the base address includes 1 bits outside the prefix specified by the mask (that is, in the ``host number'' part of the address):

    '0'
    zero out host-number bits
    'x'
    non-zero host-number bits are an error

    Initsubnet returns NULL for success and a pointer to a string-literal error message for failure; see DIAGNOSTICS.

    Addrtosubnet initializes an ip_subnet variable *dst to a ``singleton subnet'' containing the single address *addr. It returns NULL for success and a pointer to a string-literal error message for failure.

    Subnettypeof returns the address type of a subnet, normally AF_INET or AF_INET6. (The <freeswan.h> header file arranges to include the necessary headers for these names to be known.)

    Masktocount converts a subnet mask, expressed as an address, to a bit count suitable for use with initsubnet. It returns -1 for error; see DIAGNOSTICS.

    Networkof fills in *dst with the base address of subnet src.

    Maskof fills in *dst with the subnet mask of subnet src, expressed as an address.  

    SEE ALSO

    inet(3), ipsec_ttosubnet(3), ipsec_rangetosubnet(3)  

    DIAGNOSTICS

    Fatal errors in initsubnet are: unknown address family; unknown clash value; impossible mask bit count; non-zero host-number bits and clash is 'x'. Fatal errors in addrtosubnet are: unknown address family. Fatal errors in masktocount are: unknown address family; mask bits not contiguous.  

    HISTORY

    Written for the FreeS/WAN project by Henry Spencer.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    SEE ALSO
    DIAGNOSTICS
    HISTORY


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