Linux / Unix Command: ether_ntohost

Command Library

NAME

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

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 at 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];
}

SEE ALSO

Important: Use the man command (% man) to see how a command is used on your particular computer.

>> Linux/Unix Command Library

>> Shell Command Library

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