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Manuál Linux
[Linux manuál]

ether_aton, ether_ntoa, ether_ntohost, ether_hostton, ether_line, ether_ntoa_r, ether_aton_r: Rutiny manipulace s ethernetovou adresou

Originální popis anglicky: ether_aton, ether_ntoa, ether_ntohost, ether_hostton, ether_line, ether_ntoa_r, ether_aton_r - Ethernet address manipulation routines

Návod, kniha: Linux Programmer's Manual

STRUČNĚ

#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);

POPIS / INSTRUKCE

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.

ODPOVÍDAJÍCÍ

BSD 4.3, SunOS

SOUVISEJÍCÍ

ethers(5)
2002-07-20 BSD
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