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KAFS (3) | C library functions | Unix Manual Pages | :man

NAME

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

CONTENTS

Library
Synopsis
Description
Return Values
Environment
Examples
Errors
See Also
Bugs

LIBRARY

AFS cache manager access library (libkafs5, -lkafs5)

SYNOPSIS


.In 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

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 diffrently 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

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

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

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

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

krb5_appdefaults(3), krb5.conf(5)

BUGS


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