158 lines
3.9 KiB
Groff
158 lines
3.9 KiB
Groff
.\" $Id: kafs.3,v 1.3 1998/06/30 15:41:52 assar Exp $
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.\"
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.Dd May 7, 1997
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.Os KTH-KRB
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.Dt KAFS 3
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.Sh NAME
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.Nm k_hasafs ,
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.Nm k_pioctl ,
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.Nm k_unlog ,
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.Nm k_setpag ,
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.Nm k_afs_cell_of_file ,
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.Nm krb_afslog ,
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.Nm krb_afslog_uid
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.\" .Nm krb5_afslog ,
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.\" .Nm krb5_afslog_uid
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.Nd AFS library
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.Sh SYNOPSIS
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.Fd #include <kafs.h>
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.Ft int
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.Fn k_afs_cell_of_file "const char *path" "char *cell" "int len"
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.Ft int
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.Fn k_hasafs
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.Ft int
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.Fn k_pioctl "char *a_path" "int o_opcode" "struct ViceIoctl *a_paramsP" "int a_followSymlinks"
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.Ft int
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.Fn k_setpag
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.Ft int
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.Fn k_unlog
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.Ft int
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.Fn krb_afslog "char *cell" "char *realm"
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.Ft int
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.Fn krb_afslog_uid "char *cell" "char *realm" "uid_t uid"
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.\" .Ft krb5_error_code
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.\" .Fn krb5_afslog_uid "krb5_context context" "krb5_ccache id" "const char *cell" "krb5_const_realm realm" "uid_t uid"
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.\" .Ft krb5_error_code
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.\" .Fn krb5_afslog "krb5_context context" "krb5_ccache id" "const char *cell" "krb5_const_realm realm"
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.Sh DESCRIPTION
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.Fn k_hasafs
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initializes some library internal structures, and tests for the
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presense of AFS in the kernel, none of the other functions should be
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called before
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.Fn k_hasafs
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is called, or if it fails.
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.Pp
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.Fn krb_afslog ,
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and
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.Fn krb_afslog_uid
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obtains new tokens (and possibly tickets) for the specified
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.Fa cell
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and
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.Fa realm .
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If
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.Fa cell
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is
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.Dv NULL ,
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the local cell is used. If
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.Fa realm
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is
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.Dv NULL ,
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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
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.Dv NULL .
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.Fn krb_afslog
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will use the real user-id for the
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.Dv ViceId
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field in the token,
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.Fn krb_afslog_uid
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will use
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.Fa uid .
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.Pp
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.\" .Fn krb5_afslog ,
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.\" and
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.\" .Fn krb5_afslog_uid
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.\" are the Kerberos 5 equivalents of
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.\" .Fn krb_afslog ,
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.\" and
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.\" .Fn krb_afslog_uid .
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.\" The extra arguments are the ubiquitous context, and the cache id where
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.\" to store any obtained tickets. Since AFS servers normally can't handle
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.\" Kerberos 5 tickets directly, these functions will first obtain version
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.\" 5 tickets for the requested cells, and then convert them to version 4
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.\" tickets, that can be stashed in the kernel. To convert tickets the
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.\" .Fn krb524_convert_creds_kdc
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.\" function will be used.
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.\" .Pp
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.Fn k_afs_cell_of_file
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will in
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.Fa cell
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return the cell of a specified file, no more than
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.Fa len
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characters is put in
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.Fa cell .
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.Pp
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.Fn k_pioctl
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does a
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.Fn pioctl
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syscall with the specified arguments. This function is equivalent to
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.Fn lpioctl .
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.Pp
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.Fn k_setpag
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initializes a new PAG.
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.Pp
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.Fn k_unlog
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removes destroys all tokens in the current PAG.
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.Sh ENVIRONMENT
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The following environment variable affect the mode of operation of
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.Nm kafs :
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.Bl -tag -width AFS_SYSCALL
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.It Ev AFS_SYSCALL
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Normally,
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.Nm kafs
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will try to figure out the correct system call(s) that are used by AFS
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by itself. If it does not manage to do that, or does it incorrectly,
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you can set this variable to the system call number or list of system
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call numbers that should be used.
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.El
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.Sh RETURN VALUES
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.Fn k_hasafs
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returns 1 if AFS is present in the kernel, 0 otherwise.
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.Fn krb_afslog
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and
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.Fn krb_afslog_uid
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returns 0 on success, or a kerberos error number on failure.
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.Fn k_afs_cell_of_file ,
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.Fn k_pioctl ,
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.Fn k_setpag ,
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and
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.Fn k_unlog
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all return the value of the underlaying system call, 0 on success.
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.Sh EXAMPLES
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The following code from
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.Nm login
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will obtain a new PAG and tokens for the local cell and the cell of
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the users home directory.
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.Bd -literal
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if (k_hasafs()) {
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char cell[64];
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k_setpag();
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if(k_afs_cell_of_file(pwd->pw_dir, cell, sizeof(cell)) == 0)
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krb_afslog(cell, NULL);
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krb_afslog(NULL, NULL);
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}
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.Ed
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.Sh ERRORS
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If any of these functions (appart from
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.Fn k_hasafs )
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is called without AFS beeing present in the kernel, the process will
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usually (depending on the operating system) receive a SIGSYS signal.
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.Sh SEE ALSO
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.Rs
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.%A Transarc Corporation
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.%J AFS-3 Programmer's Reference
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.%T File Server/Cache Manager Interface
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.%D 1991
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.Re
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.Sh BUGS
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.Ev AFS_SYSCALL
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has no effect under AIX.
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