2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
121 lines
2.9 KiB
Groff
121 lines
2.9 KiB
Groff
.\" $NetBSD: ethers.3,v 1.13 2003/04/16 13:34:41 wiz Exp $
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.\"
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.\" Written by roland@frob.com. Public domain.
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.\"
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.Dd November 2, 1997
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.Dt ETHERS 3
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.Os
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.Sh NAME
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.Nm ether_ntoa ,
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.Nm ether_aton ,
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.Nm ether_ntohost ,
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.Nm ether_hostton ,
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.Nm ether_line ,
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.Nd get ethers entry
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/socket.h
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.In net/if.h
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.In net/if_ether.h
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.Ft char *
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.Fn ether_ntoa "const struct ether_addr *e"
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.Ft struct ether_addr *
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.Fn ether_aton "const char *s"
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.Ft int
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.Fn ether_ntohost "char *hostname" "const struct ether_addr *e"
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.Ft int
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.Fn ether_hostton "const char *hostname" "struct ether_addr *e"
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.Ft int
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.Fn ether_line "const char *line" "struct ether_addr *e" "char *hostname"
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.Sh DESCRIPTION
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Ethernet addresses are represented by the
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following structure:
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.Bd -literal -offset indent
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struct ether_addr {
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u_char ether_addr_octet[6];
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};
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.Ed
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.Pp
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The
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.Fn ether_ntoa
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function converts this structure into an ASCII string of the form
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``xx:xx:xx:xx:xx:xx'', consisting of 6 hexadecimal numbers separated
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by colons. It returns a pointer to a static buffer that is reused for
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each call.
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The
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.Fn ether_aton
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converts an ASCII string of the same form and to a structure
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containing the 6 octets of the address. It returns a pointer to a
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static structure that is reused for each call.
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.Pp
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The
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.Fn ether_ntohost
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and
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.Fn ether_hostton
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functions interrogate the data base mapping host names to Ethernet
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addresses,
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.Pa /etc/ethers .
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The
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.Fn ether_ntohost
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function looks up the given Ethernet address and writes the associated
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host name into the character buffer passed.
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The
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.Fn ether_hostton
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function looks up the given host name and writes the associated
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Ethernet address into the structure passed. Both functions return
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zero if they find the requested host name or address, and -1 if not.
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Each call reads
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.Pa /etc/ethers
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from the beginning; if a + appears alone on a line in the file, then
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.Fn ether_hostton
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will consult the
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.Pa ethers.byname
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YP map, and
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.Fn ether_ntohost
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will consult the
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.Pa ethers.byaddr
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YP map.
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.Pp
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The
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.Fn ether_line
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function parses a line from the
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.Pa /etc/ethers
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file and fills in the passed ``struct ether_addr'' and character
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buffer with the Ethernet address and host name on the line. It
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returns zero if the line was successfully parsed and -1 if not.
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.Pp
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The
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.Fa hostname
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buffer for
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.Fn ether_line
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and
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.Fn ether_ntohost
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should be at least
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.Dv MAXHOSTNAMELEN
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+ 1
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characters long, to prevent a buffer overflow during parsing.
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.Sh FILES
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.Bl -tag -width /etc/ethers -compact
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.It Pa /etc/ethers
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.El
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.Sh SEE ALSO
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.Xr ethers 5
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.Sh HISTORY
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The
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.Fn ether_ntoa ,
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.Fn ether_aton ,
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.Fn ether_ntohost ,
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.Fn ether_hostton ,
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and
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.Fn ether_line
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functions were adopted from
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.Tn SunOS
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and appeared in
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.Nx 1.0 .
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.Sh BUGS
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The data space used by these functions is static; if future use
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requires the data, it should be copied before any subsequent calls to
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these functions overwrite it.
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