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KAFS(3)

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NAME    [Toc]    [Back]

     k_hasafs, k_pioctl, k_unlog, k_setpag, k_afs_cell_of_file,
     kafs_set_verbose,    kafs_settoken_rxkad,     kafs_settoken,
krb_afslog,
     krb_afslog_uid  kafs_settoken5, krb5_afslog, krb5_afslog_uid
- AFS library

LIBRARY    [Toc]    [Back]

     AFS cache manager access library (libkafs, -lkafs)

SYNOPSIS    [Toc]    [Back]

     #include <kafs.h>

     int
     k_afs_cell_of_file(const char *path, char *cell, int len);

     int
     k_hasafs(void);

     int
     k_pioctl(char  *a_path,  int  o_opcode,   struct   ViceIoctl
*a_paramsP,
             int a_followSymlinks);

     int
     k_setpag(void);

     int
     k_unlog(void);

     void
     kafs_set_verbose(void  (*func)(void  *,  const char *, int),
void *);

     int
     kafs_settoken_rxkad(const  char  *cell,  struct   ClearToken
*token,
             void *ticket, size_t ticket_len);

     int
     kafs_settoken(const char *cell, uid_t uid, CREDENTIALS *c);

     krb_afslog(char *cell, char *realm);

     int
     krb_afslog_uid(char *cell, char *realm, uid_t uid);

     krb5_error_code
     krb5_afslog_uid(krb5_context  context, krb5_ccache id, const
char *cell,
             krb5_const_realm realm, uid_t uid);

     int
     kafs_settoken5(const char *cell, uid_t uid, krb5_creds *c);

     krb5_error_code
     krb5_afslog(krb5_context context, krb5_ccache id, const char
*cell,
             krb5_const_realm realm);

DESCRIPTION    [Toc]    [Back]

     k_hasafs() initializes some library internal structures, and
tests for
     the presence of AFS in the kernel, none of the  other  functions should be
     called before k_hasafs() is called, or if it fails.

     kafs_set_verbose()  set  a  log function that will be called
each time the
     kafs library does something important so that  the  application using
     libkafs can output verbose logging.  Calling the function
     kafs_set_verbose with the function argument set to NULL will
stop libkafs
     from calling the logging function (if set).

     kafs_settoken_rxkad() set rxkad with the  token  and  ticket
(that have the
     length ticket_len) for a given cell.

     kafs_settoken() and kafs_settoken5() work the same way as
     kafs_settoken_rxkad() but internally converts the Kerberos 4
or 5 credential
 to a afs cleartoken and ticket.

     krb_afslog(), and krb_afslog_uid() obtains new  tokens  (and
possibly tickets)
 for the specified cell and realm.  If cell is NULL, the
local cell
     is used. If realm is NULL, the function tries to guess  what
realm to use.
     Unless  you   have some good knowledge of what cell or realm
to use, you
     should pass NULL.  krb_afslog() will use  the  real  user-id
for the ViceId
     field in the token, krb_afslog_uid() will use uid.

     krb5_afslog(),  and  krb5_afslog_uid()  are  the  Kerberos 5
equivalents of
     krb_afslog(), and krb_afslog_uid().

     krb5_afslog(), kafs_settoken5() can be configured to  behave
differently
     via a krb5_appdefault option afs-use-524 in krb5.conf.  Possible values
     for afs-use-524 are:

     yes    use the 524 server in the realm to convert the ticket

     no      use the Kerberos 5 ticket directly, can be used with
if the afs
            cell support 2b token.

     local, 2b
            convert the Kerberos 5 credential to a 2b  token  locally (the same
            work as a 2b 524 server should have done).

     Example:

     [appdefaults]
             SU.SE = { afs-use-524 = local }
             PDC.KTH.SE = { afs-use-524 = yes }
             afs-use-524 = yes

     libkafs  will  use the libkafs as application name when running the
     krb5_appdefault function call.

     The (uppercased) cellname  is  used  as  the  realm  to  the
krb5_appdefault
     function.

     k_afs_cell_of_file() will in cell return the cell of a specified file, no
     more than len characters is put in cell.

     k_pioctl() does a pioctl() syscall with the specified  arguments. This
     function is equivalent to lpioctl().

     k_setpag() initializes a new PAG.

     k_unlog() removes destroys all tokens in the current PAG.

RETURN VALUES    [Toc]    [Back]

     k_hasafs() returns 1 if AFS is present in the kernel, 0 otherwise.
     krb_afslog() and krb_afslog_uid() returns 0 on success, or a
Kerberos error
  number  on  failure.  k_afs_cell_of_file(), k_pioctl(),
k_setpag(), and
     k_unlog() all return the value  of  the  underlaying  system
call, 0 on success.

ENVIRONMENT    [Toc]    [Back]

     The following environment variable affect the mode of operation of kafs:

     AFS_SYSCALL  Normally, kafs will try to figure out the  correct system
                  call(s)  that are used by AFS by itself.  If it
does not manage
 to do that, or does it incorrectly, you can
set this
                  variable  to  the system call number or list of
system call
                  numbers that should be used.

EXAMPLES    [Toc]    [Back]

     The following code from login will obtain a new PAG and  tokens for the
     local cell and the cell of the users home directory.

     if (k_hasafs()) {
             char cell[64];
             k_setpag();
             if(k_afs_cell_of_file(pwd->pw_dir,    cell,    sizeof(cell)) == 0)
                     krb_afslog(cell, NULL);
             krb_afslog(NULL, NULL);
     }

ERRORS    [Toc]    [Back]

     If any of these functions (apart from k_hasafs()) is  called
without AFS
     being  present  in the kernel, the process will usually (depending on the
     operating system) receive a SIGSYS signal.

SEE ALSO    [Toc]    [Back]

      
      
     Transarc Corporation, "File Server/Cache Manager Interface",
AFS-3
     Programmer's Reference, 1991.

     krb5_appdefaults(3), krb5.conf(5)

BUGS    [Toc]    [Back]

     AFS_SYSCALL has no effect under AIX.

 HEIMDAL                                Mar        17,       2003
[ Back ]
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