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NAME="NET-COMMON-TCPIP-MANPAGES-ETHERS">ethers</H1
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NAME="NET-COMMON-TCPIP-MANPAGES-ETHERS">ethers</H1
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>ETHERS(3) System Library Functions Manual ETHERS(3)
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>ETHERS(3) System Library Functions Manual ETHERS(3)
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NAME
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NAME
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ether_aton, ether_ntoa, ether_addr, ether_ntohost, ether_hostton,
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ether_aton, ether_ntoa, ether_addr, ether_ntohost, ether_hostton,
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ether_line - get ethers entry
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ether_line - get ethers entry
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SYNOPSIS
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SYNOPSIS
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#include <netinet/if_ether.h>
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#include <netinet/if_ether.h>
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char *
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char *
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ether_ntoa(struct ether_addr *e);
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ether_ntoa(struct ether_addr *e);
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struct ether_addr *
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struct ether_addr *
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ether_aton(char *s);
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ether_aton(char *s);
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int
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int
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ether_ntohost(char *hostname, struct ether_addr *e);
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ether_ntohost(char *hostname, struct ether_addr *e);
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int
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int
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ether_hostton(char *hostname, struct ether_addr *e);
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ether_hostton(char *hostname, struct ether_addr *e);
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int
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int
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ether_line(char *l, struct ether_addr *e, char *hostname);
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ether_line(char *l, struct ether_addr *e, char *hostname);
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DESCRIPTION
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DESCRIPTION
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Ethernet addresses are represented by the following structure:
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Ethernet addresses are represented by the following structure:
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struct ether_addr {
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struct ether_addr {
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u_int8_t ether_addr_octet[6];
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u_int8_t ether_addr_octet[6];
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};
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};
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The ether_ntoa() function converts this structure into an ASCII string of
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The ether_ntoa() function converts this structure into an ASCII string of
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the form ``xx:xx:xx:xx:xx:xx'', consisting of 6 hexadecimal numbers sepa-
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the form ``xx:xx:xx:xx:xx:xx'', consisting of 6 hexadecimal numbers sepa-
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rated by colons. It returns a pointer to a static buffer that is reused
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rated by colons. It returns a pointer to a static buffer that is reused
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for each call. The ether_aton() converts an ASCII string of the same
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for each call. The ether_aton() converts an ASCII string of the same
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form and to a structure containing the 6 octets of the address. It
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form and to a structure containing the 6 octets of the address. It
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returns a pointer to a static structure that is reused for each call.
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returns a pointer to a static structure that is reused for each call.
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The ether_ntohost() and ether_hostton() functions interrogate the
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The ether_ntohost() and ether_hostton() functions interrogate the
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database mapping host names to Ethernet addresses, /etc/ethers. The
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database mapping host names to Ethernet addresses, /etc/ethers. The
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ether_ntohost() function looks up the given Ethernet address and writes
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ether_ntohost() function looks up the given Ethernet address and writes
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the associated host name into the character buffer passed. This buffer
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the associated host name into the character buffer passed. This buffer
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should be MAXHOSTNAMELEN characters in size. The ether_hostton() func-
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should be MAXHOSTNAMELEN characters in size. The ether_hostton() func-
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tion looks up the given host name and writes the associated Ethernet
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tion looks up the given host name and writes the associated Ethernet
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address into the structure passed. Both functions return zero if they
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address into the structure passed. Both functions return zero if they
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find the requested host name or address, and -1 if not.
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find the requested host name or address, and -1 if not.
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Each call reads /etc/ethers from the beginning; if a `+' appears alone on
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Each call reads /etc/ethers from the beginning; if a `+' appears alone on
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a line in the file, then ether_hostton() will consult the ethers.byname
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a line in the file, then ether_hostton() will consult the ethers.byname
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YP map, and ether_ntohost() will consult the ethers.byaddr YP map.
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YP map, and ether_ntohost() will consult the ethers.byaddr YP map.
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The ether_line() function parses a line from the /etc/ethers file and
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The ether_line() function parses a line from the /etc/ethers file and
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fills in the passed struct ether_addr and character buffer with the Eth-
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fills in the passed struct ether_addr and character buffer with the Eth-
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ernet address and host name on the line. It returns zero if the line was
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ernet address and host name on the line. It returns zero if the line was
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successfully parsed and -1 if not. The character buffer should be
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successfully parsed and -1 if not. The character buffer should be
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MAXHOSTNAMELEN characters in size.
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MAXHOSTNAMELEN characters in size.
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FILES
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FILES
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/etc/ethers
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/etc/ethers
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SEE ALSO
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SEE ALSO
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ethers(5)
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ethers(5)
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HISTORY
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HISTORY
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The ether_ntoa(), ether_aton(), ether_ntohost(), ether_hostton(), and
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The ether_ntoa(), ether_aton(), ether_ntohost(), ether_hostton(), and
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ether_line() functions were adopted from SunOS and appeared in NetBSD 0.9
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ether_line() functions were adopted from SunOS and appeared in NetBSD 0.9
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b.
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b.
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BUGS
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BUGS
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The data space used by these functions is static; if future use requires
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The data space used by these functions is static; if future use requires
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the data, it should be copied before any subsequent calls to these func-
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the data, it should be copied before any subsequent calls to these func-
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tions overwrite it.
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tions overwrite it.
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BSD December 16, 1993 BSD
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BSD December 16, 1993 BSD
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</PRE
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