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<!-- Copyright (C) 2003 Red Hat, Inc. --> <!-- This material may be distributed only subject to the terms --> <!-- and conditions set forth in the Open Publication License, v1.0 --> <!-- or later (the latest version is presently available at --> <!-- http://www.opencontent.org/openpub/). --> <!-- Distribution of the work or derivative of the work in any --> <!-- standard (paper) book form is prohibited unless prior --> <!-- permission is obtained from the copyright holder. --> <HTML ><HEAD ><TITLE >ethers</TITLE ><meta name="MSSmartTagsPreventParsing" content="TRUE"> <META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ "><LINK REL="HOME" TITLE="eCos Reference Manual" HREF="ecos-ref.html"><LINK REL="UP" TITLE="TCP/IP Library Reference" HREF="tcpip-library-reference.html"><LINK REL="PREVIOUS" TITLE="byteorder" HREF="net-common-tcpip-manpages-byteorder.html"><LINK REL="NEXT" TITLE="getaddrinfo" HREF="net-common-tcpip-manpages-getaddrinfo.html"></HEAD ><BODY CLASS="SECT1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >eCos Reference Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="net-common-tcpip-manpages-byteorder.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 38. TCP/IP Library Reference</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="net-common-tcpip-manpages-getaddrinfo.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="SECT1" ><H1 CLASS="SECT1" ><A NAME="NET-COMMON-TCPIP-MANPAGES-ETHERS">ethers</H1 ><TABLE BORDER="5" BGCOLOR="#E0E0F0" WIDTH="70%" ><TR ><TD ><PRE CLASS="SCREEN" >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 ></TD ></TR ></TABLE ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="net-common-tcpip-manpages-byteorder.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ecos-ref.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="net-common-tcpip-manpages-getaddrinfo.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >byteorder</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="tcpip-library-reference.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >getaddrinfo</TD ></TR ></TABLE ></DIV ></BODY ></HTML >
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