ETHER_ATON(3)                                       Linux Programmer's Manual                                      ETHER_ATON(3)



NAME
       ether_aton, ether_ntoa, ether_ntohost, ether_hostton, ether_line, ether_ntoa_r, ether_aton_r - Ethernet address manipula-
       tion 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  host-
       name;  '#' 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
       This  page  is  part of release 3.25 of the Linux man-pages project.  A description of the project, and information about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                                                        2002-07-20                                              ETHER_ATON(3)