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krb5_krbhst_next (3)
  • >> krb5_krbhst_next (3) ( FreeBSD man: Библиотечные вызовы )

  • BSD mandoc
    HEIMDAL  

    NAME

    krb5_krbhst_init
    
     
    krb5_krbhst_next
    
     
    krb5_krbhst_next_as_string
    
     
    krb5_krbhst_reset
    
     
    krb5_krbhst_free
    
     
    krb5_krbhst_format_string
    
     
    krb5_krbhst_get_addrinfo
    
     - lookup Kerberos KDC hosts
    
     
    

    LIBRARY

    Kerberos 5 Library (libkrb5, -lkrb5)
     
    

    SYNOPSIS

       #include <krb5.h>
    krb5_error_code krb5_krbhst_init (krb5_context context const char *realm unsigned int type krb5_krbhst_handle *handle);
    krb5_error_code krb5_krbhst_next (krb5_context context krb5_krbhst_handle handle krb5_krbhst_info **host);
    krb5_error_code krb5_krbhst_next_as_string (krb5_context context krb5_krbhst_handle handle char *hostname size_t hostlen);
    void krb5_krbhst_reset (krb5_context context krb5_krbhst_handle handle);
    void krb5_krbhst_free (krb5_context context krb5_krbhst_handle handle);
    krb5_error_code krb5_krbhst_format_string (krb5_context context const krb5_krbhst_info *host char *hostname size_t hostlen);
    krb5_error_code krb5_krbhst_get_addrinfo (krb5_context context krb5_krbhst_info *host struct addrinfo **ai);
     

    DESCRIPTION

    These functions are used to sequence through all Kerberos hosts of a particular realm and service. The service type can be the KDCs, the administrative servers, the password changing servers, or the servers for Kerberos 4 ticket conversion.

    First a handle to a particular service is obtained by calling krb5_krbhst_init ();
    with the Fa realm of interest and the type of service to lookup. The Fa type can be one of:

    KRB5_KRBHST_KDC
    KRB5_KRBHST_ADMIN
    KRB5_KRBHST_CHANGEPW
    KRB5_KRBHST_KRB524

    The Fa handle is returned to the caller, and should be passed to the other functions.

    For each call to krb5_krbhst_next ();
    information a new host is returned. The former function returns in Fa host a pointer to a structure containing information about the host, such as protocol, hostname, and port:

    typedef struct krb5_krbhst_info {
        enum { KRB5_KRBHST_UDP,
               KRB5_KRBHST_TCP,
               KRB5_KRBHST_HTTP } proto;
        unsigned short port;
        struct addrinfo *ai;
        struct krb5_krbhst_info *next;
        char hostname[1];
    } krb5_krbhst_info;
    

    The related function, krb5_krbhst_next_as_string (,);
    return the same information as a url-like string.

    When there are no more hosts, these functions return KRB5_KDC_UNREACH

    To re-iterate over all hosts, call krb5_krbhst_reset ();
    and the next call to krb5_krbhst_next ();
    will return the first host.

    When done with the handle, krb5_krbhst_free ();
    should be called.

    To use a krb5_krbhst_info there are two functions: krb5_krbhst_format_string ();
    that will return a printable representation of that struct and krb5_krbhst_get_addrinfo ();
    that will return a struct addrinfo that can then be used for communicating with the server mentioned.  

    EXAMPLE

    The following code will print the KDCs of the realm ``MY.REALM''
    krb5_krbhst_handle handle;
    char host[MAXHOSTNAMELEN];
    krb5_krbhst_init(context, "MY.REALM", KRB5_KRBHST_KDC, &handle);
    while(krb5_krbhst_next_as_string(context, handle,
                                     host, sizeof(host)) == 0)
        printf("%s\n", host);
    krb5_krbhst_free(context, handle);
    
     

    HISTORY

    These functions first appeared in Heimdal 0.3g.  

    SEE ALSO

    getaddrinfo(3), krb5_get_krbhst3


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    EXAMPLE
    HISTORY
    SEE ALSO


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