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ISBN : 978-2-7460-9712-4
EAN : 9782746097124
(Editions ENI)

GNU/Linux

CentOS 4.8

i386

ether_ntohost(3)


ETHER_ATON

ETHER_ATON

NAME
SYNOPSIS
DESCRIPTION
BUGS
CONFORMING TO
SEE ALSO

NAME

ether_aton, ether_ntoa, ether_ntohost, ether_hosttonn, ether_line, ether_ntoa_r, ether_aton_r − Ethernet address manipulation routines

SYNOPSIS

#include <netinet/ether.h>

char *
ether_ntoa(const struct ether_addr *
addr);

struct ether_addr *
ether_aton(const char *
asc);

int
ether_ntohost(char *
hostname, const struct ether_addr *addr);

int
ether_hostton(const char *
hostname, struct ether_addr *addr);

int
ether_line(const char *
line, struct ether_addr *addr,
char *
hostname);

/* GNU extensions */
char *
ether_ntoa_r(const struct ether_addr *
addr, char *buf);

struct ether_addr *
ether_aton_r(const char *
asc, struct ether_addr *addr);

DESCRIPTION

ether_aton() converts the 48-bit Ethernet host address asc from the standard hex-digits-and-colons notation into binary data in network byte order and returns a pointer to it in a statically allocated buffer, which subsequent calls will overwrite. ether_aton returns NULL if the address is invalid.

The ether_ntoa() function converts the Ethernet host address addr given in network byte order to a string in standard hex-digits-and-colons notation, omitting leading zeroes. The string is returned in a statically allocated buffer, which subsequent calls will overwrite.

The ether_ntohost() function maps an Ethernet address to the corresponding hostname in /etc/ethers and returns non-zero if it cannot be found.

The ether_hostton() function maps a hostname to the corresponding Ethernet address in /etc/ethers and returns non-zero if it cannot be found.

The ether_line() function parses a line in /etc/ethers format (ethernet address followed by whitespace followed by hostname; ’#’ introduces a comment) and returns an address and hostname pair, or non-zero if it cannot be parsed. The buffer pointed to by hostname must be sufficiently long, e.g., have the same length as line.

The functions ether_ntoa_r and ether_aton_r are re-entrant threadsafe versions of ether_ntoa and ether_aton respectively, and do not use static buffers.

The structure ether_addr is defined in net/ethernet.h as:

struct ether_addr {
u_int8_t ether_addr_octet[6];
}

BUGS

The glibc 2.2.5 implementation of ether_line() is broken.

CONFORMING TO

BSD 4.3, SunOS

SEE ALSO

ethers(5)



ether_ntohost(3)