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  *   	ˆl–Ü4ý(”†»â‚fãM\eõ1hßÁƒtM7_†I|¥+ÅÄ M    	/*
 * $Id$
 *
 * Copyright (c) 1999 Andrew G. Morgan <morgan@linux.kernel.org>
 *
 * This header file provides the prototypes for the PAM client API
 */

#ifndef PAM_CLIENT_H
#define PAM_CLIENT_H

#ifdef __cplusplus
extern "C" {
#endif /* def __cplusplus */

#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include <sys/types.h>

/* opaque agent handling structure */

typedef struct pamc_handle_s *pamc_handle_t;

/* binary prompt structure pointer */
typedef struct { uint32_t length; uint8_t control; } *pamc_bp_t;

/*
 * functions provided by libpamc
 */

/*
 * Initialize the agent abstraction library
 */

pamc_handle_t pamc_start(void);

/*
 * Terminate the authentication process
 */

int pamc_end(pamc_handle_t *pch);

/*
 * force the loading of a specified agent
 */

int pamc_load(pamc_handle_t pch, const char *agent_id);

/*
 * Single conversation interface for binary prompts
 */

int pamc_converse(pamc_handle_t pch, pamc_bp_t *prompt_p);

/*
 * disable an agent
 */

int pamc_disable(pamc_handle_t pch, const char *agent_id);

/*
 * obtain a list of available agents
 */

char **pamc_list_agents(pamc_handle_t pch);

/*
 * PAM_BP_ MACROS for creating, destroying and manipulating binary prompts
 */

#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

#ifndef PAM_BP_ASSERT
# ifdef NDEBUG
#  define PAM_BP_ASSERT(x)   do {} while (0)
# else
#  define PAM_BP_ASSERT(x)   do { printf(__FILE__ "(%d): %s\n", \
					 __LINE__, x) ; exit(1); } while (0)
# endif /* NDEBUG */
#endif /* PAM_BP_ASSERT */

#ifndef PAM_BP_CALLOC
# define PAM_BP_CALLOC      calloc
#endif /* PAM_BP_CALLOC */

#ifndef PAM_BP_FREE
# define PAM_BP_FREE        free
#endif /* PAM_BP_FREE */

#define __PAM_BP_WOCTET(x,y)  (*((y) + (uint8_t *)(x)))
#define __PAM_BP_ROCTET(x,y)  (*((y) + (const uint8_t *)(x)))

#define PAM_BP_MIN_SIZE       (sizeof(uint32_t) + sizeof(uint8_t))
#define PAM_BP_MAX_LENGTH     0x20000                   /* an advisory limit */
#define PAM_BP_WCONTROL(x)    (__PAM_BP_WOCTET(x,4))
#define PAM_BP_RCONTROL(x)    (__PAM_BP_ROCTET(x,4))
#define PAM_BP_SIZE(x)        ((__PAM_BP_ROCTET(x,0)<<24)+      \
			       (__PAM_BP_ROCTET(x,1)<<16)+      \
			       (__PAM_BP_ROCTET(x,2)<< 8)+      \
			       (__PAM_BP_ROCTET(x,3)    ))
#define PAM_BP_LENGTH(x)      (PAM_BP_SIZE(x) - PAM_BP_MIN_SIZE)
#define PAM_BP_WDATA(x)       (PAM_BP_MIN_SIZE + (uint8_t *) (x))
#define PAM_BP_RDATA(x)       (PAM_BP_MIN_SIZE + (const uint8_t *) (x))

/* Note, this macro always '\0' terminates renewed packets */

#define PAM_BP_RENEW(old_p, cntrl, data_length)                            \
do {                                                                       \
    if ((old_p) != NULL) {                                                 \
	if (*(old_p)) {                                                    \
	    uint32_t __size;                                              \
            __size = PAM_BP_SIZE(*(old_p));                                \
	    memset(*(old_p), 0, __size);                                   \
	    PAM_BP_FREE(*(old_p));                                         \
	}                                                                  \
	if (cntrl) {                                                       \
	    uint32_t __size;                                              \
                                                                           \
	    __size = PAM_BP_MIN_SIZE + data_length;                        \
	    if ((*(old_p) = PAM_BP_CALLOC(1, 1+__size))) {                 \
		__PAM_BP_WOCTET(*(old_p), 3) =  __size      & 0xFF;        \
		__PAM_BP_WOCTET(*(old_p), 2) = (__size>>=8) & 0xFF;        \
		__PAM_BP_WOCTET(*(old_p), 1) = (__size>>=8) & 0xFF;        \
		__PAM_BP_WOCTET(*(old_p), 0) = (__size>>=8) & 0xFF;        \
		(*(old_p))->control = cntrl;                               \
	    } else {                                                       \
		PAM_BP_ASSERT("out of memory for binary promp