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NAME

       ether_aton,   ether_ntoa,   ether_ntohost,  ether_hostton,  ether_line,
       ether_ntoa_r, ether_aton_r - Ethernet address manipulation routines

SYNOPSIS

       #include <netinet/ether.h>

       char *ether_ntoa(const struct ether_addr *addr);

       struct ether_addr *ether_aton(const char *asc);

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

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

       int ether_line(const char *line, struct ether_addr *addr,
                      char *hostname);

       /* GNU extensions */
       char *ether_ntoa_r(const struct ether_addr *addr, char *buf);

       struct ether_addr *ether_aton_r(const char *asc,
                                       struct ether_addr *addr);

DESCRIPTION

       ether_aton() converts the 48-bit Ethernet host  address  asc  from  the
       standard  hex-digits-and-colons  notation  into  binary data in network
       byte order and returns a  pointer  to  it  in  a  statically  allocated
       buffer,  which  subsequent  calls will overwrite.  ether_aton() returns
       NULL if the address is invalid.

       The ether_ntoa() function converts the Ethernet host address addr given
       in  network  byte  order  to a string in standard hex-digits-and-colons
       notation,  omitting  leading  zeros.   The  string  is  returned  in  a
       statically allocated buffer, which subsequent calls will overwrite.

       The   ether_ntohost()   function   maps  an  Ethernet  address  to  the
       corresponding hostname in /etc/ethers and returns nonzero if it  cannot
       be found.

       The  ether_hostton()  function  maps  a  hostname  to the corresponding
       Ethernet address in /etc/ethers and returns nonzero  if  it  cannot  be
       found.

       The ether_line() function parses a line in /etc/ethers format (ethernet
       address followed by whitespace followed by hostname; '#'  introduces  a
       comment)  and  returns  an  address and hostname pair, or nonzero if it
       cannot  be  parsed.   The  buffer  pointed  to  by  hostname  must   be
       sufficiently long, for example, have the same length as line.

       The  functions  ether_ntoa_r() and ether_aton_r() are reentrant thread-
       safe versions of ether_ntoa() and ether_aton() respectively, and do not
       use static buffers.

       The structure ether_addr is defined in <net/ethernet.h> as:

           struct ether_addr {
               uint8_t ether_addr_octet[6];
           }

CONFORMING TO

       4.3BSD, SunOS.

BUGS

       The glibc 2.2.5 implementation of ether_line() is broken.

SEE ALSO

       ethers(5)

COLOPHON

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       description of the project, and information about reporting  bugs,  can
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