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-.\"     $OpenBSD: ethers.3,v 1.21 2011/04/19 22:38:26 matthew Exp $
-.\"
-.\" Written by roland@frob.com.  Public domain.
-.\"
-.Dd $Mdocdate: April 19 2011 $
-.Dt ETHERS 3
-.Os
-.Sh NAME
-.Nm ether_aton ,
-.Nm ether_ntoa ,
-.Nm ether_ntohost ,
-.Nm ether_hostton ,
-.Nm ether_line
-.Nd get ethers entry
-.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <sys/socket.h>
-.Fd #include <net/if.h>
-.Fd #include <netinet/in.h>
-.Fd #include <netinet/if_ether.h>
-.Ft char *
-.Fn ether_ntoa "struct ether_addr *e"
-.Ft struct ether_addr *
-.Fn ether_aton "const char *s"
-.Ft int
-.Fn ether_ntohost "char *hostname" "struct ether_addr *e"
-.Ft int
-.Fn ether_hostton "const char *hostname" "struct ether_addr *e"
-.Ft int
-.Fn ether_line "const char *l" "struct ether_addr *e" "char *hostname"
-.Sh DESCRIPTION
-Ethernet addresses are represented by the
-following structure:
-.Bd -literal -offset indent
-struct ether_addr {
-        u_int8_t  ether_addr_octet[6];
-};
-.Ed
-.Pp
-The
-.Fn ether_ntoa
-function converts this structure into an
-.Tn ASCII
-string of the form
-.Dq xx:xx:xx:xx:xx:xx ,
-consisting of 6 hexadecimal numbers separated
-by colons.
-It returns a pointer to a static buffer that is reused for each call.
-The
-.Fn ether_aton
-converts an
-.Tn 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.
-.Fn ether_aton
-will return NULL if the string does not represent a valid address.
-.Pp
-The
-.Fn ether_ntohost
-and
-.Fn ether_hostton
-functions interrogate the database mapping host names to Ethernet
-addresses,
-.Pa /etc/ethers .
-The
-.Fn ether_ntohost
-function looks up the given Ethernet address and writes the associated
-host name into the character buffer passed.
-This buffer should be
-.Dv MAXHOSTNAMELEN
-characters in size.
-The
-.Fn ether_hostton
-function 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.
-.Pp
-Each call reads
-.Pa /etc/ethers
-from the beginning; if a
-.Ql +
-appears alone on a line in the file, then
-.Fn ether_hostton
-will consult the
-.Pa ethers.byname
-YP map, and
-.Fn ether_ntohost
-will consult the
-.Pa ethers.byaddr
-YP map.
-.Pp
-The
-.Fn ether_line
-function parses a line from the
-.Pa /etc/ethers
-file and fills in the passed
-.Li struct ether_addr
-and character buffer with the Ethernet 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
-.Dv MAXHOSTNAMELEN
-characters in size.
-.Sh FILES
-.Bl -tag -width /etc/ethers -compact
-.It Pa /etc/ethers
-.El
-.Sh SEE ALSO
-.Xr ethers 5
-.Sh HISTORY
-The
-.Fn ether_ntoa ,
-.Fn ether_aton ,
-.Fn ether_ntohost ,
-.Fn ether_hostton ,
-and
-.Fn ether_line
-functions were adopted from SunOS and appeared in
-.Nx 0.9b .
-.Sh 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 functions overwrite it.