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ether_hostton (3)
  • >> ether_hostton (3) ( FreeBSD man: Библиотечные вызовы )
  • ether_hostton (3) ( Русские man: Библиотечные вызовы )
  • ether_hostton (3) ( Linux man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    ethers
    
     
    ether_line
    
     
    ether_aton
    
     
    ether_aton_r
    
     
    ether_ntoa
    
     
    ether_ntoa_r
    
     
    ether_ntohost
    
     
    ether_hostton
    
     - Ethernet address conversion and lookup routines
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <sys/types.h>
       #include <sys/socket.h>
       #include <net/ethernet.h>
    int ether_line (const char *l struct ether_addr *e char *hostname);
    struct ether_addr * ether_aton (const char *a);
    struct ether_addr * ether_aton_r (const char *a struct ether_addr *e);
    char * ether_ntoa (const struct ether_addr *n);
    char * ether_ntoa_r (const struct ether_addr *n char *buf);
    int ether_ntohost (char *hostname const struct ether_addr *e);
    int ether_hostton (const char *hostname struct ether_addr *e);
     

    DESCRIPTION

    These functions operate on ethernet addresses using an Vt ether_addr structure, which is defined in the header file In netinet/if_ether.h :
    /*
     * The number of bytes in an ethernet (MAC) address.
     */
    #define ETHER_ADDR_LEN          6
    
    /*
     * Structure of a 48-bit Ethernet address.
     */
    struct  ether_addr {
            u_char octet[ETHER_ADDR_LEN];
    };
    

    The function ether_line ();
    scans Fa l , an ASCII string in ethers(5) format and sets Fa e to the ethernet address specified in the string and Fa h to the hostname. This function is used to parse lines from /etc/ethers into their component parts.

    The ether_aton ();
    and ether_aton_r ();
    functions convert ASCII representation of ethernet addresses into Vt ether_addr structures. Likewise, the ether_ntoa ();
    and ether_ntoa_r ();
    functions convert ethernet addresses specified as Vt ether_addr structures into ASCII strings.

    The ether_ntohost ();
    and ether_hostton ();
    functions map ethernet addresses to their corresponding hostnames as specified in the /etc/ethers database. The ether_ntohost ();
    function converts from ethernet address to hostname, and ether_hostton ();
    converts from hostname to ethernet address.  

    RETURN VALUES

    The ether_line ();
    function returns zero on success and non-zero if it was unable to parse any part of the supplied line Fa l . It returns the extracted ethernet address in the supplied Vt ether_addr structure Fa e and the hostname in the supplied string Fa h .

    On success, ether_ntoa ();
    and ether_ntoa_r ();
    functions return a pointer to a string containing an ASCII representation of an ethernet address. If it is unable to convert the supplied Vt ether_addr structure, it returns a NULL pointer. ether_ntoa ();
    stores the result in a static buffer; ether_ntoa_r ();
    stores the result in a user-passed buffer.

    Likewise, ether_aton ();
    and ether_aton_r ();
    return a pointer to an Vt ether_addr structure on success and a NULL pointer on failure. ether_aton ();
    stores the result in a static buffer; ether_aton_r ();
    stores the result in a user-passed buffer.

    The ether_ntohost ();
    and ether_hostton ();
    functions both return zero on success or non-zero if they were unable to find a match in the /etc/ethers database.  

    NOTES

    The user must insure that the hostname strings passed to the ether_line (,);
    ether_ntohost ();
    and ether_hostton ();
    functions are large enough to contain the returned hostnames.  

    NIS INTERACTION

    If the /etc/ethers contains a line with a single + in it, the ether_ntohost ();
    and ether_hostton ();
    functions will attempt to consult the NIS ethers.byname and ethers.byaddr maps in addition to the data in the /etc/ethers file.  

    SEE ALSO

    ethers(5), yp(8)  

    HISTORY

    This particular implementation of the library functions were written for and first appeared in Fx 2.1 . Thread-safe function variants first appeared in Fx 7.0 .  

    BUGS

    The ether_aton ();
    and ether_ntoa ();
    functions returns values that are stored in static memory areas which may be overwritten the next time they are called.

    ether_ntoa_r ();
    accepts a character buffer pointer, but not a buffer length. The caller must ensure adequate space is available in the buffer in order to avoid a buffer overflow.


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    NOTES
    NIS INTERACTION
    SEE ALSO
    HISTORY
    BUGS


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