eui64_hostton(3) [freebsd man page]

EUI64(3)						   BSD Library Functions Manual 						  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
     specified 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 database.

NOTES

     The user must ensure that the hostname strings passed to the eui64_ntohost() and eui64_hostton() functions are large enough to contain the
     returned hostnames.

NIS INTERACTION

     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)

HISTORY

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

BSD
								   March 4, 2004							       BSD

ETHERS(3)						   BSD Library Functions Manual 						 ETHERS(3)

NAME

     ethers, ether_line, ether_aton, ether_ntoa, ether_ntohost, ether_hostton -- Ethernet address conversion and lookup routines

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/types.h>
     #include <sys/socket.h>
     #include <net/ethernet.h>

     int
     ether_line(const char *l, struct ether_addr *e, char *hostname);

     struct ether_addr *
     ether_aton(const char *a);

     char *
     ether_ntoa(const struct ether_addr *n);

     int
     ether_ntohost(char *hostname, const struct ether_addr *e);

     int
     ether_hostton(const char *hostname, struct ether_addr *e);

DESCRIPTION

     These functions operate on ethernet addresses using an ether_addr structure, which is defined in the header file <netinet/if_ether.h>:

	   /*
	    * The number of bytes in an ethernet (MAC) address.
	    */
	   #define ETHER_ADDR_LEN	   6

	   /*
	    * Structure of a 48-bit Ethernet address.
	    */
	   struct  ether_addr {
		   u_char octet[ETHER_ADDR_LEN];
	   };

     The function ether_line() scans l, an ASCII string in ethers(5) format and sets e to the ethernet address specified in the string and h to
     the hostname.  This function is used to parse lines from /etc/ethers into their component parts.

     The ether_aton() function converts an ASCII representation of an ethernet address into an ether_addr structure.  Likewise, ether_ntoa() con-
     verts an ethernet address specified as an ether_addr structure into an ASCII string.

     The ether_ntohost() and ether_hostton() functions map ethernet addresses to their corresponding hostnames as specified in the /etc/ethers
     database.	ether_ntohost() converts from ethernet address to hostname, and ether_hostton() converts from hostname to ethernet address.

RETURN VALUES

     ether_line() returns zero on success and non-zero if it was unable to parse any part of the supplied line l.  It returns the extracted ether-
     net address in the supplied ether_addr structure e and the hostname in the supplied string h.

     On success, ether_ntoa() returns a pointer to a string containing an ASCII representation of an ethernet address.	If it is unable to convert
     the supplied ether_addr structure, it returns a NULL pointer.  Likewise, ether_aton() returns a pointer to an ether_addr structure on success
     and a NULL pointer on failure.

     The ether_ntohost() and ether_hostton() functions both return zero on success or non-zero if they were unable to find a match in the
     /etc/ethers database.

NOTES

     The user must insure that the hostname strings passed to the ether_line(), ether_ntohost() and ether_hostton() functions are large enough to
     contain the returned hostnames.

NIS INTERACTION

     If the /etc/ethers contains a line with a single + in it, the ether_ntohost() and ether_hostton() functions will attempt to consult the NIS
     ethers.byname and ethers.byaddr maps in addition to the data in the /etc/ethers file.

SEE ALSO

     yp(8), ethers(5)

BUGS

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

HISTORY

     This particular implementation of the ethers library functions were written for and first appeared in FreeBSD 2.1.

BSD
								  April 12, 1995							       BSD