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->ETHERS(3) System Library Functions Manual ETHERS(3)
-
-NAME
- ether_aton, ether_ntoa, ether_addr, ether_ntohost, ether_hostton,
- ether_line - get ethers entry
-
-SYNOPSIS
- #include <netinet/if_ether.h>
-
- char *
- ether_ntoa(struct ether_addr *e);
-
- struct ether_addr *
- ether_aton(char *s);
-
- int
- ether_ntohost(char *hostname, struct ether_addr *e);
-
- int
- ether_hostton(char *hostname, struct ether_addr *e);
-
- int
- ether_line(char *l, struct ether_addr *e, char *hostname);
-
-DESCRIPTION
- Ethernet addresses are represented by the following structure:
-
- struct ether_addr {
- u_int8_t ether_addr_octet[6];
- };
-
- The ether_ntoa() function converts this structure into an ASCII string of
- the form ``xx:xx:xx:xx:xx:xx'', consisting of 6 hexadecimal numbers sepa-
- rated by colons. It returns a pointer to a static buffer that is reused
- for each call. The ether_aton() converts an ASCII string of the same
- form and to a structure containing the 6 octets of the address. It
- returns a pointer to a static structure that is reused for each call.
-
- The ether_ntohost() and ether_hostton() functions interrogate the
- database mapping host names to Ethernet addresses, /etc/ethers. The
- ether_ntohost() function looks up the given Ethernet address and writes
- the associated host name into the character buffer passed. This buffer
- should be MAXHOSTNAMELEN characters in size. The ether_hostton() func-
- tion looks up the given host name and writes the associated Ethernet
- address into the structure passed. Both functions return zero if they
- find the requested host name or address, and -1 if not.
-
- Each call reads /etc/ethers from the beginning; if a `+' appears alone on
- a line in the file, then ether_hostton() will consult the ethers.byname
- YP map, and ether_ntohost() will consult the ethers.byaddr YP map.
-
- The ether_line() function parses a line from the /etc/ethers file and
- fills in the passed struct ether_addr and character buffer with the Eth-
- ernet address and host name on the line. It returns zero if the line was
- successfully parsed and -1 if not. The character buffer should be
- MAXHOSTNAMELEN characters in size.
-
-FILES
- /etc/ethers
-
-SEE ALSO
- ethers(5)
-
-HISTORY
- The ether_ntoa(), ether_aton(), ether_ntohost(), ether_hostton(), and
- ether_line() functions were adopted from SunOS and appeared in NetBSD 0.9
- b.
-
-BUGS
- The data space used by these functions is static; if future use requires
- the data, it should be copied before any subsequent calls to these func-
- tions overwrite it.
-
-BSD December 16, 1993 BSD
- </PRE
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