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eui64(3)

NAME

     eui64, eui64_aton, eui64_ntoa, eui64_ntohost, eui64_hostton -- IEEE
     EUI-64 conversion and lookup routines

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/types.h>
     #include <sys/eui64.h>

     int
     eui64_aton(const char *a, struct eui64 *e);

     int
     eui64_ntoa(const struct eui64 *id, char *a, size_t len);

     int
     eui64_ntohost(char *hostname, size_t len, const struct eui64 *id);

     int
     eui64_hostton(const char *hostname, struct eui64 *id);

DESCRIPTION

     These functions operate on IEEE EUI-64s using an eui64 structure, which
     is defined in the header file <sys/eui64.h>:

	   /*
	    * The number of bytes in an EUI-64.
	    */
	   #define EUI64_LEN		   8

	   /*
	    * Structure of an IEEE EUI-64.
	    */
	   struct  eui64 {
		   u_char octet[EUI64_LEN];
	   };

     The eui64_aton() function converts an ASCII representation of an EUI-64
     into an eui64 structure.  Likewise, eui64_ntoa() converts an EUI-64 spec-
     ified as an eui64 structure into an ASCII string.

     The eui64_ntohost() and eui64_hostton() functions map EUI-64s to their
     corresponding hostnames as specified in the /etc/eui64 database.  The
     eui64_ntohost() function converts from EUI-64 to hostname, and
     eui64_hostton() converts from hostname to EUI-64.

RETURN VALUES

     On success, eui64_ntoa() returns a pointer to a string containing an
     ASCII representation of an EUI-64.  If it is unable to convert the sup-
     plied eui64 structure, it returns a NULL pointer.	Likewise, eui64_aton()
     returns a pointer to an eui64 structure on success and a NULL pointer on
     failure.

     The eui64_ntohost() and eui64_hostton() functions both return zero on
     success or non-zero if they were unable to find a match in the /etc/eui64
     If the /etc/eui64 contains a line with a single `+' in it, the
     eui64_ntohost() and eui64_hostton() functions will attempt to consult the
     NIS eui64.byname and eui64.byid maps in addition to the data in the
     /etc/eui64 file.

SEE ALSO

     firewire(4), eui64(5), yp(8)

BUGS

     The eui64_aton() and eui64_ntoa() functions returns values that are
     stored in static memory areas which may be overwritten the next time they
     are called.

HISTORY

     These functions first appears in FreeBSD 5.3.  They are derived from the
     ethers(3) family of functions.

FreeBSD 5.4			 March 4, 2004			   FreeBSD 5.4

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