/* 
 * $Id: aklog_main.c,v 1.12.2.15 2008/04/01 18:15:40 shadow Exp $
 *
 * Copyright 1990,1991 by the Massachusetts Institute of Technology
 * For distribution and copying rights, see the file "mit-copyright.h"
 */
/*
 * Copyright (c) 2005, 2006                                     
 * The Linux Box Corporation                                    
 * ALL RIGHTS RESERVED                                          
 *                                                              
 * Permission is granted to use, copy, create derivative works  
 * and redistribute this software and such derivative works     
 * for any purpose, so long as the name of the Linux Box        
 * Corporation is not used in any advertising or publicity      
 * pertaining to the use or distribution of this software       
 * without specific, written prior authorization.  If the       
 * above copyright notice or any other identification of the    
 * Linux Box Corporation is included in any copy of any         
 * portion of this software, then the disclaimer below must     
 * also be included.                                            
 *                                                              
 * This software is provided as is, without representation      
 * from the Linux Box Corporation as to its fitness for any     
 * purpose, and without warranty by the Linux Box Corporation   
 * of any kind, either express or implied, including            
 * without limitation the implied warranties of                 
 * merchantability and fitness for a particular purpose.  The   
 * regents of the Linux Box Corporation shall not be liable     
 * for any damages, including special, indirect, incidental, or 
 * consequential damages, with respect to any claim arising     
 * out of or in connection with the use of the software, even   
 * if it has been or is hereafter advised of the possibility of 
 * such damages.                                                
 */

#include <afsconfig.h>
RCSID
     ("$Header: /cvs/openafs/src/aklog/aklog_main.c,v 1.12.2.15 2008/04/01 18:15:40 shadow Exp $");
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#include <errno.h>

#include <sys/stat.h>
#include <fcntl.h>

#include <sys/param.h>
#include <sys/errno.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pwd.h>

#include <afs/stds.h>
#include <krb5.h>

#ifndef HAVE_KERBEROSV_HEIM_ERR_H
#include <afs/com_err.h>
#endif

#include <afs/param.h>
#ifdef AFS_SUN5_ENV
#include <sys/ioccom.h>
#endif
#include <afs/auth.h>
#include <afs/cellconfig.h>
#include <afs/vice.h>
#include <afs/venus.h>
#include <afs/ptserver.h>
#include <afs/ptuser.h>
#include <afs/dirpath.h>

#include "aklog.h"
#include "linked_list.h"

#ifdef HAVE_KRB5_CREDS_KEYBLOCK
#define USING_MIT 1
#endif
#ifdef HAVE_KRB5_CREDS_SESSION
#define USING_HEIMDAL 1
#endif

#define AFSKEY "afs"
#define AFSINST ""

#ifndef AFS_TRY_FULL_PRINC
#define AFS_TRY_FULL_PRINC 1
#endif /* AFS_TRY_FULL_PRINC */

#define AKLOG_TRYAGAIN -1
#define AKLOG_SUCCESS 0
#define AKLOG_USAGE 1
#define AKLOG_SOMETHINGSWRONG 2
#define AKLOG_AFS 3
#define AKLOG_KERBEROS 4
#define AKLOG_TOKEN 5
#define AKLOG_BADPATH 6
#define AKLOG_MISC 7

#ifndef NULL
#define NULL 0
#endif

#ifndef TRUE
#define TRUE 1
#endif

#ifndef FALSE
#define FALSE 0
#endif

#ifndef MAXSYMLINKS
/* RedHat 4.x doesn't seem to define this */
#define MAXSYMLINKS	5
#endif

#define DIR '/'			/* Character that divides directories */
#define DIRSTRING "/"		/* String form of above */
#define VOLMARKER ':'		/* Character separating cellname from mntpt */
#define VOLMARKERSTRING ":"	/* String form of above */

typedef struct {
    char cell[BUFSIZ];
    char realm[REALM_SZ];
} cellinfo_t;

struct afsconf_cell ak_cellconfig; /* General information about the cell */
static char linkedcell[MAXCELLCHARS+1];
static char linkedcell2[MAXCELLCHARS+1];
static krb5_ccache  _krb425_ccache = NULL;

/*
 * Why doesn't AFS provide these prototypes?
 */

extern int pioctl(char *, afs_int32, struct ViceIoctl *, afs_int32);

/*
 * Other prototypes
 */

extern char *afs_realm_of_cell(krb5_context, struct afsconf_cell *, int);
static int isdir(char *, unsigned char *);
static krb5_error_code get_credv5(krb5_context context, char *, char *,
				  char *, krb5_creds **);
static int get_user_realm(krb5_context, char *);

#define TRYAGAIN(x) (x == AKLOG_TRYAGAIN || \
		     x == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN || \
		     x == KRB5KRB_ERR_GENERIC)

#if defined(HAVE_KRB5_PRINC_SIZE) || defined(krb5_princ_size)

#define get_princ_str(c, p, n) krb5_princ_component(c, p, n)->data
#define get_princ_len(c, p, n) krb5_princ_component(c, p, n)->length
#define second_comp(c, p) (krb5_princ_size(c, p) > 1)
#define realm_data(c, p) krb5_princ_realm(c, p)->data
#define realm_len(c, p) krb5_princ_realm(c, p)->length

#elif defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING)

#define get_princ_str(c, p, n) krb5_principal_get_comp_string(c, p, n)
#define get_princ_len(c, p, n) strlen(krb5_principal_get_comp_string(c, p, n))
#define second_comp(c, p) (krb5_principal_get_comp_string(c, p, 1) != NULL)
#define realm_data(c, p) krb5_realm_data(krb5_principal_get_realm(c, p))
#define realm_len(c, p) krb5_realm_length(krb5_principal_get_realm(c, p))

#else
#error "Must have either krb5_princ_size or krb5_principal_get_comp_string"
#endif

#if !defined(HAVE_KRB5_ENCRYPT_TKT_PART) && defined(HAVE_ENCODE_KRB5_ENC_TKT_PART) && defined(HAVE_KRB5_C_ENCRYPT) 
krb5_error_code
krb5_encrypt_tkt_part(krb5_context context,
		      const krb5_keyblock *key,
		      krb5_ticket *ticket)
{
    krb5_data *data = 0;
    int code;
    size_t enclen;
    
    if ((code = encode_krb5_enc_tkt_part(ticket->enc_part2, &data)))
	goto Done;
    if ((code = krb5_c_encrypt_length(context, key->enctype,
				      data->length, &enclen)))
	goto Done;
    ticket->enc_part.ciphertext.length = enclen;
    if (!(ticket->enc_part.ciphertext.data = malloc(enclen))) {
	code = ENOMEM;
	goto Done;
    }
    if ((code = krb5_c_encrypt(context, key, KRB5_KEYUSAGE_KDC_REP_TICKET,
			       0, data, &ticket->enc_part))) {
	free(ticket->enc_part.ciphertext.data);
	ticket->enc_part.ciphertext.data = 0;
    }
Done:
    if (data) {
	if (data->data)
	    free(data->data);
	free(data);
    }
    return code;
}
#endif

#if defined(HAVE_KRB5_CREDS_KEYBLOCK)

#define get_cred_keydata(c) c->keyblock.contents
#define get_cred_keylen(c) c->keyblock.length
#define get_creds_enctype(c) c->keyblock.enctype

#elif defined(HAVE_KRB5_CREDS_SESSION)

#define get_cred_keydata(c) c->session.keyvalue.data
#define get_cred_keylen(c) c->session.keyvalue.length
#define get_creds_enctype(c) c->session.keytype

#else
#error "Must have either keyblock or session member of krb5_creds"
#endif

#if !defined(HAVE_KRB5_524_CONVERT_CREDS) && defined(HAVE_KRB524_CONVERT_CREDS_KDC)
#define krb5_524_convert_creds krb524_convert_creds_kdc
#elif !defined(HAVE_KRB5_524_CONVERT_CREDS) && !defined(HAVE_KRB524_CONVERT_CREDS_KDC)
#define HAVE_NO_KRB5_524
#endif

#if USING_HEIMDAL
#define deref_keyblock_enctype(kb)		\
    ((kb)->keytype)

#define deref_entry_keyblock(entry)		\
    entry->keyblock

#define deref_session_key(creds)		\
    creds->session

#define deref_enc_tkt_addrs(tkt)		\
    tkt->caddr

#define deref_enc_length(enc)			\
    ((enc)->cipher.length)

#define deref_enc_data(enc)			\
    ((enc)->cipher.data)

#define krb5_free_keytab_entry_contents krb5_kt_free_entry

#else
#define deref_keyblock_enctype(kb)		\
    ((kb)->enctype)

#define deref_entry_keyblock(entry)		\
    entry->key

#define deref_session_key(creds)		\
    creds->keyblock

#define deref_enc_tkt_addrs(tkt)		\
    tkt->caddrs

#define deref_enc_length(enc)			\
    ((enc)->ciphertext.length)

#define deref_enc_data(enc)			\
    ((enc)->ciphertext.data)

#endif

#define deref_entry_enctype(entry)			\
    deref_keyblock_enctype(&deref_entry_keyblock(entry))

/*
 * Provide a replacement for strerror if we don't have it
 */

#ifndef HAVE_STRERROR
extern char *sys_errlist[];
#define strerror(x) sys_errlist[x]
#endif /* HAVE_STRERROR */

static char *progname = NULL;	/* Name of this program */
static int dflag = FALSE;	/* Give debugging information */
static int noauth = FALSE;	/* If true, don't try to get tokens */
static int zsubs = FALSE;	/* Are we keeping track of zephyr subs? */
static int hosts = FALSE;	/* Are we keeping track of hosts? */
static int noprdb = FALSE;	/* Skip resolving name to id? */
static int linked = FALSE;      /* try for both AFS nodes */
static int afssetpag = FALSE;   /* setpag for AFS */
static int force = FALSE;	/* Bash identical tokens? */
static int do524 = FALSE;	/* Should we do 524 instead of rxkad2b? */
static char *keytab = NULL;     /* keytab for akimpersonate */
static char *client = NULL;     /* client principal for akimpersonate */
static linked_list zsublist;	/* List of zephyr subscriptions */
static linked_list hostlist;	/* List of host addresses */
static linked_list authedcells;	/* List of cells already logged to */

/* ANL - CMU lifetime convert routine */
/* for K5.4.1 don't use this for now. Need to see if it is needed */
/* maybe needed in the krb524d module as well */
/* extern unsigned long krb_life_to_time(); */

static char *copy_cellinfo(cellinfo_t *cellinfo)
{
    cellinfo_t *new_cellinfo;

    if ((new_cellinfo = (cellinfo_t *)malloc(sizeof(cellinfo_t))))
	memcpy(new_cellinfo, cellinfo, sizeof(cellinfo_t));
    
    return ((char *)new_cellinfo);
}


static char *copy_string(char *string)    
{
    char *new_string;

    if ((new_string = (char *)calloc(strlen(string) + 1, sizeof(char))))
	(void) strcpy(new_string, string);

    return (new_string);
}


static int get_cellconfig(char *cell, struct afsconf_cell *cellconfig, char *local_cell, char *linkedcell)
{
    int status = AKLOG_SUCCESS;
    struct afsconf_dir *configdir;

    memset(local_cell, 0, sizeof(local_cell));
    memset((char *)cellconfig, 0, sizeof(*cellconfig));

    if (!(configdir = afsconf_Open(AFSDIR_CLIENT_ETC_DIRPATH))) {
	fprintf(stderr, 
		"%s: can't get afs configuration (afsconf_Open(%s))\n",
		progname, AFSDIR_CLIENT_ETC_DIRPATH);
	exit(AKLOG_AFS);
    }

    if (afsconf_GetLocalCell(configdir, local_cell, MAXCELLCHARS)) {
	fprintf(stderr, "%s: can't determine local cell.\n", progname);
	exit(AKLOG_AFS);
    }

    if ((cell == NULL) || (cell[0] == 0))
	cell = local_cell;

	linkedcell[0] = '\0';
    if (afsconf_GetCellInfo(configdir, cell, NULL, cellconfig)) {
	fprintf(stderr, "%s: Can't get information about cell %s.\n",
		progname, cell);
	status = AKLOG_AFS;
    }
	if (cellconfig->linkedCell) 
		strncpy(linkedcell,cellconfig->linkedCell,MAXCELLCHARS);

    (void) afsconf_Close(configdir);

    return(status);
}

/* 
 * Log to a cell.  If the cell has already been logged to, return without
 * doing anything.  Otherwise, log to it and mark that it has been logged
 * to.
 */
static int auth_to_cell(krb5_context context, char *cell, char *realm)
{
    int status = AKLOG_SUCCESS;
    char username[BUFSIZ];	/* To hold client username structure */
    afs_int32 viceId;		/* AFS uid of user */

    char realm_of_user[REALM_SZ]; /* Kerberos realm of user */
    char *realm_from_princ = 0 ;  /* Calculated realm data */
    char *realm_of_cell = 0;	  /* Pointer to realm we're using */	
    int retry;			  /* round, and round we go ... */
    
    char local_cell[MAXCELLCHARS+1];
    char cell_to_use[MAXCELLCHARS+1]; /* Cell to authenticate to */
    static char lastcell[MAXCELLCHARS+1] = { 0 };
    static char confname[512] = { 0 };
    krb5_creds *v5cred = NULL;
    struct ktc_principal aserver;
    struct ktc_principal aclient;
    struct ktc_token atoken, btoken;

    memset(realm_of_user, 0, sizeof(realm_of_user));

    if (confname[0] == '\0') {
	strncpy(confname, AFSDIR_CLIENT_ETC_DIRPATH, sizeof(confname));
	confname[sizeof(confname) - 2] = '\0';
    }

    /* NULL or empty cell returns information on local cell */
    if ((status = get_cellconfig(cell, &ak_cellconfig,
			 local_cell, linkedcell)))
	return(status);

    strncpy(cell_to_use, ak_cellconfig.name, MAXCELLCHARS);
    cell_to_use[MAXCELLCHARS] = 0;

    if (ll_string(&authedcells, ll_s_check, cell_to_use)) {
	if (dflag) {
	    printf("Already authenticated to %s (or tried to)\n", 
		   cell_to_use);
	}
	return(AKLOG_SUCCESS);
    }

    /* 
     * Record that we have attempted to log to this cell.  We do this
     * before we try rather than after so that we will not try
     * and fail repeatedly for one cell.
     */
    (void)ll_string(&authedcells, ll_s_add, cell_to_use);

    /* 
     * Record this cell in the list of zephyr subscriptions.  We may
     * want zephyr subscriptions even if authentication fails.
     * If this is done after we attempt to get tokens, aklog -zsubs
     * can return something different depending on whether or not we
     * are in -noauth mode.
     */
    if (ll_string(&zsublist, ll_s_add, cell_to_use) == LL_FAILURE) {
	fprintf(stderr, 
		"%s: failure adding cell %s to zephyr subscriptions list.\n",
		progname, cell_to_use);
	exit(AKLOG_MISC);
    }
    if (ll_string(&zsublist, ll_s_add, local_cell) == LL_FAILURE) {
	fprintf(stderr, 
		"%s: failure adding cell %s to zephyr subscriptions list.\n",
		progname, local_cell);
	exit(AKLOG_MISC);
    }

    if (!noauth) {
	if (dflag) {
	    printf("Authenticating to cell %s (server %s).\n",
		   cell_to_use, ak_cellconfig.hostName[0]);
	}

	if ((status = get_user_realm(context, realm_of_user))) {
	    fprintf(stderr, "%s: Couldn't determine realm of user:)",
		    progname);
	    afs_com_err(progname, status, " while getting realm");
	    return(AKLOG_KERBEROS);
	}

	retry = 1;
	
	while(retry) {
	    
	    /* Cell on command line - use that one */
	    if (realm && realm[0]) {
		realm_of_cell = realm;
		status = AKLOG_TRYAGAIN;
		if (dflag) {
		    printf("We were told to authenticate to realm %s.\n", 
			   realm);
		}
	    } else {
		/* Initially, try using afs/cell@USERREALM */
		if (dflag) {
		    printf("Trying to authenticate to user's realm %s.\n",
			   realm_of_user);
		}
		
		realm_of_cell = realm_of_user;
		status = get_credv5(context, AFSKEY, cell_to_use, 
				    realm_of_cell, &v5cred);
	    
		/* If that failed, try to determine the realm from the name of 
		 * one of the DB servers */
		if (TRYAGAIN(status)) {
		    realm_of_cell = afs_realm_of_cell(context, &ak_cellconfig, 
				    		      FALSE);
		    if (!realm_of_cell) {
			fprintf(stderr, 
				"%s: Couldn't figure out realm for cell %s.\n",
				progname, cell_to_use);
		    	exit(AKLOG_MISC);
	    	    }

		    if (dflag) {
			if (realm_of_cell[0])
			    printf("We've deduced that we need to authenticate"
				   " to realm %s.\n", realm_of_cell);
		    else
			printf("We've deduced that we need to authenticate "
			       "using referrals.\n");
		    }
		}
	    }
	
	    if (TRYAGAIN(status)) {
		/* If we've got the full-princ-first option, or we're in a
		 * different realm from the cell - use the cell name as the
		 * instance */
		if (AFS_TRY_FULL_PRINC || 
		    strcasecmp(cell_to_use, realm_of_cell)!=0) {
		    status = get_credv5(context, AFSKEY, cell_to_use, 
				        realm_of_cell, &v5cred);

		    /* If we failed & we've got an empty realm, then try 
		     * calling afs_realm_for_cell again. */
		    if (TRYAGAIN(status) && !realm_of_cell[0]) {
			/* This time, get the realm by taking the domain 
			 * component of the db server and make it upper case */
		    	realm_of_cell = afs_realm_of_cell(context, 
							  &ak_cellconfig, TRUE);
			if (!realm_of_cell) {
			    fprintf(stderr,
				    "%s: Couldn't figure out realm for cell "
				    "%s.\n", progname, cell_to_use);
			    exit(AKLOG_MISC);
			}
			printf("We've deduced that we need to authenticate to"
			       " realm %s.\n", realm_of_cell);
		    }
		    status = get_credv5(context, AFSKEY, cell_to_use, 
				        realm_of_cell, &v5cred);
	    	}
	   
		/* If the realm and cell name match, then try without an 
		 * instance, but only if realm is non-empty */
	        
		if (TRYAGAIN(status) && 
		    strcasecmp(cell_to_use, realm_of_cell) == 0) {
		    status = get_credv5(context, AFSKEY, NULL, 
				        realm_of_cell, &v5cred);
    		    if (!AFS_TRY_FULL_PRINC && TRYAGAIN(status)) {
		        status = get_credv5(context, AFSKEY, cell_to_use,
				            realm_of_cell, &v5cred);
		    }
		}
	    }

	    /* Try to find a service principal for this cell.
	     * Some broken MIT libraries return KRB5KRB_AP_ERR_MSG_TYPE upon 
	     * the first attempt, so we try twice to be sure */

	    if (status == KRB5KRB_AP_ERR_MSG_TYPE && retry == 1)
		retry++;
	    else
		retry = 0;
	} 
	
	if (status != 0) {
	    if (dflag) {
		printf("Kerberos error code returned by get_cred : %d\n",
		       status);
	    }
	    fprintf(stderr, "%s: Couldn't get %s AFS tickets:\n",
		    progname, cell_to_use);
	    afs_com_err(progname, status, "while getting AFS tickets");
	    return(AKLOG_KERBEROS);
	}
	
	/* If we've got a valid ticket, and we still don't know the realm name
	 * try to figure it out from the contents of the ticket
	 */
#if !defined(USING_HEIMDAL) && defined(HAVE_KRB5_DECODE_TICKET)
	if (strcmp(realm_of_cell, "") == 0) {
	    krb5_error_code code;
	    krb5_ticket *ticket;

	    code = krb5_decode_ticket(&v5cred->ticket, &ticket);

	    if (code != 0) {
		fprintf(stderr,
			"%s: Couldn't decode ticket to determine realm for "
			"cell %s.\n",
		    	progname, cell_to_use);
	    } else {
		int len = realm_len(context, ticket->server);
		/* This really shouldn't happen. */
		if (len > REALM_SZ-1)
		    len = REALM_SZ-1;

		realm_from_princ = (char *) malloc(sizeof(char) * (len+1));
		
		strncpy(realm_from_princ, realm_data(context, ticket->server), 
			len);
		realm_from_princ[len] = 0;
		realm_of_cell = realm_from_princ;
		
		krb5_free_ticket(context, ticket);
	    }
	}
#endif

	strncpy(aserver.name, AFSKEY, MAXKTCNAMELEN - 1);
	strncpy(aserver.instance, AFSINST, MAXKTCNAMELEN - 1);
	strncpy(aserver.cell, cell_to_use, MAXKTCREALMLEN - 1);

	/*
 	 * The default is to use rxkad2b, which means we put in a full
	 * V5 ticket.  If the user specifies -524, we talk to the
	 * 524 ticket converter.
	 */

	if (! do524) {
	    char *p;
	    int len;

	    if (dflag)
	    	printf("Using Kerberos V5 ticket natively\n");

	    len = min(get_princ_len(context, v5cred->client, 0),
	    	      second_comp(context, v5cred->client) ?
					MAXKTCNAMELEN - 2 : MAXKTCNAMELEN - 1);
	    strncpy(username, get_princ_str(context, v5cred->client, 0), len);
	    username[len] = '\0';

	    if (second_comp(context, v5cred->client)) {
	    	strcat(username, ".");
		p = username + strlen(username);
		len = min(get_princ_len(context, v5cred->client, 1),
			  MAXKTCNAMELEN - strlen(username) - 1);
		strncpy(p, get_princ_str(context, v5cred->client, 1), len);
		p[len] = '\0';
	    }

	    memset(&atoken, 0, sizeof(atoken));
	    atoken.kvno = RXKAD_TKT_TYPE_KERBEROS_V5;
	    atoken.startTime = v5cred->times.starttime;;
	    atoken.endTime = v5cred->times.endtime;
	    memcpy(&atoken.sessionKey, get_cred_keydata(v5cred),
		   get_cred_keylen(v5cred));
	    atoken.ticketLen = v5cred->ticket.length;
	    memcpy(atoken.ticket, v5cred->ticket.data, atoken.ticketLen);
#ifndef HAVE_NO_KRB5_524
	} else {
    	    CREDENTIALS cred;

	    if (dflag)
	    	printf("Using Kerberos 524 translator service\n");

	    status = krb5_524_convert_creds(context, v5cred, &cred);

	    if (status) {
		afs_com_err(progname, status, "while converting tickets "
			"to Kerberos V4 format");
		return(AKLOG_KERBEROS);
	    }

	    strcpy (username, cred.pname);
	    if (cred.pinst[0]) {
		strcat (username, ".");
		strcat (username, cred.pinst);
	    }

	    atoken.kvno = cred.kvno;
	    atoken.startTime = cred.issue_date;
	    /*
	     * It seems silly to go through a bunch of contortions to
	     * extract the expiration time, when the v5 credentials already
	     * has the exact time!  Let's use that instead.
	     *
	     * Note that this isn't a security hole, as the expiration time
	     * is also contained in the encrypted token
	     */
	    atoken.endTime = v5cred->times.endtime;
	    memcpy(&atoken.sessionKey, cred.session, 8);
	    atoken.ticketLen = cred.ticket_st.length;
	    memcpy(atoken.ticket, cred.ticket_st.dat, atoken.ticketLen);
#endif /* HAVE_NO_KRB5_524 */
	}
	
	if (!force &&
	    !ktc_GetToken(&aserver, &btoken, sizeof(btoken), &aclient) &&
	    atoken.kvno == btoken.kvno &&
	    atoken.ticketLen == btoken.ticketLen &&
	    !memcmp(&atoken.sessionKey, &btoken.sessionKey, sizeof(atoken.sessionKey)) &&
	    !memcmp(atoken.ticket, btoken.ticket, atoken.ticketLen)) {

	    if (dflag) {
		printf("Identical tokens already exist; skipping.\n");
	    }
	    return 0;
	}

#ifdef FORCE_NOPRDB
	noprdb = 1;
#endif

	if (noprdb) {
	    if (dflag) {
		printf("Not resolving name %s to id (-noprdb set)\n",
			username);
	    }
	}
	else {
	    if (strcmp(realm_of_user, realm_of_cell)) {
		strcat(username, "@");
		strcat(username, realm_of_user);
	    }

	    if (dflag) {
		printf("About to resolve name %s to id in cell %s.\n", 
			username, aserver.cell);
	    }

	    strcpy(lastcell, aserver.cell);

	    if (!pr_Initialize (0, confname, aserver.cell))
		    status = pr_SNameToId (username, &viceId);
	    
	    if (dflag) {
		if (status) 
		    printf("Error %d\n", status);
		else
		    printf("Id %d\n", (int) viceId);
	    }
	    
		/*
		 * This is a crock, but it is Transarc's crock, so
		 * we have to play along in order to get the
		 * functionality.  The way the afs id is stored is
		 * as a string in the username field of the token.
		 * Contrary to what you may think by looking at
		 * the code for tokens, this hack (AFS ID %d) will
		 * not work if you change %d to something else.
		 */

		/*
		 * This code is taken from cklog -- it lets people
		 * automatically register with the ptserver in foreign cells
		 */

#ifdef ALLOW_REGISTER
	    if ((status == 0) && (viceId == ANONYMOUSID) &&
	 	(strcmp(realm_of_user, realm_of_cell) != 0)) {
		if (dflag) {
		    printf("doing first-time registration of %s "
			    "at %s\n", username, cell_to_use);
		}
		viceId = 0;
		strncpy(aclient.name, username, MAXKTCNAMELEN - 1);
		strcpy(aclient.instance, "");
		strncpy(aclient.cell, realm_of_user, MAXKTCREALMLEN - 1);
		if ((status = ktc_SetToken(&aserver, &atoken, &aclient, 0))) {
		    fprintf(stderr, "%s: unable to obtain tokens for cell %s "
			    "(status: %d).\n", progname, cell_to_use, status);
		    status = AKLOG_TOKEN;
		}

		/*
		 * In case you're wondering, we don't need to change the
		 * filename here because we're still connecting to the
		 * same cell -- we're just using a different authentication
		 * level
		 */

		if ((status = pr_Initialize(1L, confname, aserver.cell))) {
		    printf("Error %d\n", status);
		}

		if ((status = pr_CreateUser(username, &viceId))) {
		    fprintf(stderr, "%s: %s so unable to create remote PTS "
			    "user %s in cell %s (status: %d).\n", progname,
			    afs_error_message(status), username, cell_to_use,
			    status);
		    viceId = ANONYMOUSID;
		} else {
		    printf("created cross-cell entry for %s (Id %d) at %s\n",
			   username, viceId, cell_to_use);
		}
	    }
#endif /* ALLOW_REGISTER */

	    if ((status == 0) && (viceId != ANONYMOUSID)) {
		sprintf(username, "AFS ID %d", (int) viceId);
	    }
	}

	if (dflag) {
	    fprintf(stdout, "Set username to %s\n", username);
	}

	/* Reset the "aclient" structure before we call ktc_SetToken.
	 * This structure was first set by the ktc_GetToken call when
	 * we were comparing whether identical tokens already existed.
	 */
	strncpy(aclient.name, username, MAXKTCNAMELEN - 1);
	strcpy(aclient.instance, "");
	strncpy(aclient.cell, realm_of_user, MAXKTCREALMLEN - 1);

	if (dflag) {
	    printf("Setting tokens. %s / %s @ %s \n",
		    aclient.name, aclient.instance, aclient.cell );
	}
#ifndef AFS_AIX51_ENV
	/* on AIX 4.1.4 with AFS 3.4a+ if a write is not done before 
	 * this routine, it will not add the token. It is not clear what 
	 * is going on here! So we will do the following operation.
	 * On AIX 5, it causes the parent program to die, so we won't.
	 */
	write(2,"",0); /* dummy write */
#endif
	if ((status = ktc_SetToken(&aserver, &atoken, &aclient, afssetpag))) {
	    fprintf(stderr, 
		    "%s: unable to obtain tokens for cell %s (status: %d).\n",
		    progname, cell_to_use, status);
	    status = AKLOG_TOKEN;
	}
    }
    else
	if (dflag) {
	    printf("Noauth mode; not authenticating.\n");
	}
	
    return(status);
}

static int get_afs_mountpoint(char *file, char *mountpoint, int size)
{
#ifdef AFS_SUN_ENV
	char V ='V'; /* AFS has problem on Sun with pioctl */
#endif
    char our_file[MAXPATHLEN + 1];
    char *parent_dir;
    char *last_component;
    struct ViceIoctl vio;
    char cellname[BUFSIZ];

    memset(our_file, 0, sizeof(our_file));
    strcpy(our_file, file);

    if ((last_component = strrchr(our_file, DIR))) {
	*last_component++ = 0;
	parent_dir = our_file;
    }
    else {
	last_component = our_file;
	parent_dir = ".";
    }    
    
    memset(cellname, 0, sizeof(cellname));

    vio.in = last_component;
    vio.in_size = strlen(last_component)+1;
    vio.out_size = size;
    vio.out = mountpoint;

    if (!pioctl(parent_dir, VIOC_AFS_STAT_MT_PT, &vio, 0)) {
	if (strchr(mountpoint, VOLMARKER) == NULL) {
	    vio.in = file;
	    vio.in_size = strlen(file) + 1;
	    vio.out_size = sizeof(cellname);
	    vio.out = cellname;
	    
	    if (!pioctl(file, VIOC_FILE_CELL_NAME, &vio, 1)) {
		strcat(cellname, VOLMARKERSTRING);
		strcat(cellname, mountpoint + 1);
		memset(mountpoint + 1, 0, size - 1);
		strcpy(mountpoint + 1, cellname);
	    }
	}
	return(TRUE);
    }
    else
	return(FALSE);
}

/* 
 * This routine each time it is called returns the next directory 
 * down a pathname.  It resolves all symbolic links.  The first time
 * it is called, it should be called with the name of the path
 * to be descended.  After that, it should be called with the arguemnt
 * NULL.
 */
static char *next_path(char *origpath)
{
    static char path[MAXPATHLEN + 1];
    static char pathtocheck[MAXPATHLEN + 1];

    int link = FALSE;		/* Is this a symbolic link? */
    char linkbuf[MAXPATHLEN + 1];
    char tmpbuf[MAXPATHLEN + 1];

    static char *last_comp;	/* last component of directory name */
    static char *elast_comp;	/* End of last component */
    char *t;
    int len;
    
    static int symlinkcount = 0; /* We can't exceed MAXSYMLINKS */
    
    /* If we are given something for origpath, we are initializing only. */
    if (origpath) {
	memset(path, 0, sizeof(path));
	memset(pathtocheck, 0, sizeof(pathtocheck));
	strcpy(path, origpath);
	last_comp = path;
	symlinkcount = 0;
	return(NULL);
    }

    /* We were not given origpath; find then next path to check */
    
    /* If we've gotten all the way through already, return NULL */
    if (last_comp == NULL)
	return(NULL);

    do {
	while (*last_comp == DIR)
	    strncat(pathtocheck, last_comp++, 1);
	len = (elast_comp = strchr(last_comp, DIR)) 
	    ? elast_comp - last_comp : strlen(last_comp);
	strncat(pathtocheck, last_comp, len);
	memset(linkbuf, 0, sizeof(linkbuf));
	if ((link = (readlink(pathtocheck, linkbuf, 
				    sizeof(linkbuf)) > 0))) {
	    if (++symlinkcount > MAXSYMLINKS) {
		fprintf(stderr, "%s: %s\n", progname, strerror(ELOOP));
		exit(AKLOG_BADPATH);
	    }
	    memset(tmpbuf, 0, sizeof(tmpbuf));
	    if (elast_comp)
		strcpy(tmpbuf, elast_comp);
	    if (linkbuf[0] == DIR) {
		/* 
		 * If this is a symbolic link to an absolute path, 
		 * replace what we have by the absolute path.
		 */
		memset(path, 0, strlen(path));
		memcpy(path, linkbuf, sizeof(linkbuf));
		strcat(path, tmpbuf);
		last_comp = path;
		elast_comp = NULL;
		memset(pathtocheck, 0, sizeof(pathtocheck));
	    }
	    else {
		/* 
		 * If this is a symbolic link to a relative path, 
		 * replace only the last component with the link name.
		 */
		strncpy(last_comp, linkbuf, strlen(linkbuf) + 1);
		strcat(path, tmpbuf);
		elast_comp = NULL;
		if ((t = strrchr(pathtocheck, DIR))) {
		    t++;
		    memset(t, 0, strlen(t));
		}
		else
		    memset(pathtocheck, 0, sizeof(pathtocheck));
	    }
	}
	else
	    last_comp = elast_comp;
    }
    while(link);

    return(pathtocheck);
}

#if 0
/*****************************************/
int dee_gettokens()
{
#ifdef AFS_SUN_ENV
	char V = 'V'; /* AFS has problem on SunOS */
#endif
   struct ViceIoctl vio;
   char outbuf[BUFSIZ];
   long ind;
   int fd;

   memset(outbuf, 0, sizeof(outbuf));

   vio.out_size = sizeof(outbuf);
   vio.in_size = sizeof(ind);
   vio.out = outbuf;
   vio.in = &ind;

   ind = 0;
   fd = open("dee.tok",O_WRONLY);
   while(!pioctl(0,VIOCGETTOK,&vio,0)) {
	write(fd,&outbuf,sizeof(outbuf)); 
       ind++;
   }
   close(fd);
}
/*****************************************/
#endif

static void add_hosts(char *file)
{
#ifdef AFS_SUN_ENV
	char V = 'V'; /* AFS has problem on SunOS */
#endif
    struct ViceIoctl vio;
    char outbuf[BUFSIZ];
    long *phosts;
    int i;
    struct hostent *hp;
    struct in_addr in;
    
    memset(outbuf, 0, sizeof(outbuf));

    vio.out_size = sizeof(outbuf);
    vio.in_size = 0;
    vio.out = outbuf;

    if (dflag) {
	printf("Getting list of hosts for %s\n", file);
    }
    /* Don't worry about errors. */
    if (!pioctl(file, VIOCWHEREIS, &vio, 1)) {
	phosts = (long *) outbuf;

	/*
	 * Lists hosts that we care about.  If ALLHOSTS is defined,
	 * then all hosts that you ever may possible go through are
	 * included in this list.  If not, then only hosts that are
	 * the only ones appear.  That is, if a volume you must use
	 * is replaced on only one server, that server is included.
	 * If it is replicated on many servers, then none are included.
	 * This is not perfect, but the result is that people don't
	 * get subscribed to a lot of instances of FILSRV that they
	 * probably won't need which reduces the instances of 
	 * people getting messages that don't apply to them.
	 */
#ifndef ALLHOSTS
	if (phosts[1] != '\0')
	    return;
#endif
	for (i = 0; phosts[i]; i++) {
	    if (hosts) {
		in.s_addr = phosts[i];
		if (dflag) {
		    printf("Got host %s\n", inet_ntoa(in));
		}
		ll_string(&hostlist, ll_s_add, (char *)inet_ntoa(in));
	    }
	    if (zsubs && (hp=gethostbyaddr((char *) &phosts[i],sizeof(long),AF_INET))) {
		if (dflag) {
		    printf("Got host %s\n", hp->h_name);
		}
		ll_string(&zsublist, ll_s_add, hp->h_name);
	    }
	}
    }
}

/*
 * This routine descends through a path to a directory, logging to 
 * every cell it encounters along the way.
 */
static int auth_to_path(krb5_context context, char *path)
{
    int status = AKLOG_SUCCESS;
    int auth_to_cell_status = AKLOG_SUCCESS;

    char *nextpath;
    char pathtocheck[MAXPATHLEN + 1];
    char mountpoint[MAXPATHLEN + 1];

    char *cell;
    char *endofcell;

    u_char isdirectory;

    /* Initialize */
    if (path[0] == DIR)
	strcpy(pathtocheck, path);
    else {
	if (getcwd(pathtocheck, sizeof(pathtocheck)) == NULL) {
	    fprintf(stderr, "Unable to find current working directory:\n");
	    fprintf(stderr, "%s\n", pathtocheck);
	    fprintf(stderr, "Try an absolute pathname.\n");
	    exit(AKLOG_BADPATH);
	}
	else {
	    strcat(pathtocheck, DIRSTRING);
	    strcat(pathtocheck, path);
	}
    }
    next_path(pathtocheck);

    /* Go on to the next level down the path */
    while ((nextpath = next_path(NULL))) {
	strcpy(pathtocheck, nextpath);
	if (dflag) {
	    printf("Checking directory %s\n", pathtocheck);
	}
	/* 
	 * If this is an afs mountpoint, determine what cell from 
	 * the mountpoint name which is of the form 
	 * #cellname:volumename or %cellname:volumename.
	 */
	if (get_afs_mountpoint(pathtocheck, mountpoint, sizeof(mountpoint))) {
	    /* skip over the '#' or '%' */
	    cell = mountpoint + 1;
	    /* Add this (cell:volumename) to the list of zsubs */
	    if (zsubs)
		ll_string(&zsublist, ll_s_add, cell);
	    if (zsubs || hosts)
		add_hosts(pathtocheck);
	    if ((endofcell = strchr(mountpoint, VOLMARKER))) {
		*endofcell = '\0';
		if ((auth_to_cell_status = auth_to_cell(context, cell, NULL))) {
		    if (status == AKLOG_SUCCESS)
			status = auth_to_cell_status;
		    else if (status != auth_to_cell_status)
			status = AKLOG_SOMETHINGSWRONG;
		}
	    }
	}
	else {
	    if (isdir(pathtocheck, &isdirectory) < 0) {
		/*
		 * If we've logged and still can't stat, there's
		 * a problem... 
		 */
		fprintf(stderr, "%s: stat(%s): %s\n", progname, 
			pathtocheck, strerror(errno));
		return(AKLOG_BADPATH);
	    }
	    else if (! isdirectory) {
		/* Allow only directories */
		fprintf(stderr, "%s: %s: %s\n", progname, pathtocheck,
			strerror(ENOTDIR));
		return(AKLOG_BADPATH);
	    }
	}
    }
    

    return(status);
}


/* Print usage message and exit */
static void usage(void)
{
    fprintf(stderr, "\nUsage: %s %s%s%s\n", progname,
	    "[-d] [[-cell | -c] cell [-k krb_realm]] ",
	    "[[-p | -path] pathname]\n",
	    "    [-zsubs] [-hosts] [-noauth] [-noprdb] [-force] [-setpag] \n"
		"    [-linked]"
#ifndef HAVE_NO_KRB5_524
		" [-524]"
#endif
		"\n");
    fprintf(stderr, "    -d gives debugging information.\n");
    fprintf(stderr, "    krb_realm is the kerberos realm of a cell.\n");
    fprintf(stderr, "    pathname is the name of a directory to which ");
    fprintf(stderr, "you wish to authenticate.\n");
    fprintf(stderr, "    -zsubs gives zephyr subscription information.\n");
    fprintf(stderr, "    -hosts gives host address information.\n");
    fprintf(stderr, "    -noauth does not attempt to get tokens.\n");
    fprintf(stderr, "    -noprdb means don't try to determine AFS ID.\n");
    fprintf(stderr, "    -force means replace identical tickets. \n");
    fprintf(stderr, "    -linked means if AFS node is linked, try both. \n");
    fprintf(stderr, "    -setpag set the AFS process authentication group.\n");
#ifndef HAVE_NO_KRB5_524
    fprintf(stderr, "    -524 means use the 524 converter instead of V5 directly\n");
#endif
    fprintf(stderr, "    No commandline arguments means ");
    fprintf(stderr, "authenticate to the local cell.\n");
    fprintf(stderr, "\n");
    exit(AKLOG_USAGE);
}

void aklog(int argc, char *argv[])
{
	krb5_context context;
    int status = AKLOG_SUCCESS;
    int i;
    int somethingswrong = FALSE;

    cellinfo_t cellinfo;

    extern char *progname;	/* Name of this program */

    extern int dflag;		/* Debug mode */

    int cmode = FALSE;		/* Cellname mode */
    int pmode = FALSE;		/* Path name mode */

    char realm[REALM_SZ];	/* Kerberos realm of afs server */
    char cell[BUFSIZ];		/* Cell to which we are authenticating */
    char path[MAXPATHLEN + 1];		/* Path length for path mode */

    linked_list cells;		/* List of cells to log to */
    linked_list paths;		/* List of paths to log to */
    ll_node *cur_node;

    memset(&cellinfo, 0, sizeof(cellinfo));

    memset(realm, 0, sizeof(realm));
    memset(cell, 0, sizeof(cell));
    memset(path, 0, sizeof(path));

    ll_init(&cells);
    ll_init(&paths);

    ll_init(&zsublist);
    ll_init(&hostlist);

    /* Store the program name here for error messages */
    if ((progname = strrchr(argv[0], DIR)))
	progname++;
    else
	progname = argv[0];

    krb5_init_context(&context);
    initialize_ktc_error_table ();

    /* Initialize list of cells to which we have authenticated */
    (void)ll_init(&authedcells);

    /* Parse commandline arguments and make list of what to do. */
    for (i = 1; i < argc; i++) {
	if (strcmp(argv[i], "-d") == 0)
	    dflag++;
	else if (strcmp(argv[i], "-noauth") == 0) 
	    noauth++;
	else if (strcmp(argv[i], "-zsubs") == 0)
	    zsubs++;
	else if (strcmp(argv[i], "-hosts") == 0)
	    hosts++;
	else if (strcmp(argv[i], "-noprdb") == 0)
	    noprdb++;
	else if (strcmp(argv[i], "-linked") == 0)
		linked++;
	else if (strcmp(argv[i], "-force") == 0)
	    force++;
#ifndef HAVE_NO_KRB5_524
	else if (strcmp(argv[i], "-524") == 0)
	    do524++;
#endif
    else if (strcmp(argv[i], "-setpag") == 0)
	    afssetpag++;
	else if (((strcmp(argv[i], "-cell") == 0) ||
		  (strcmp(argv[i], "-c") == 0)) && !pmode)
	    if (++i < argc) {
		cmode++;
		strcpy(cell, argv[i]);
	    }
	    else
		usage();
	else if ((strcmp(argv[i], "-keytab") == 0))
	    if (++i < argc) {
		keytab = argv[i];
	    }
	    else
		usage();
	else if ((strcmp(argv[i], "-principal") == 0))
	    if (++i < argc) {
		client = argv[i];
	    }
	    else
		usage();
	else if (((strcmp(argv[i], "-path") == 0) ||
		  (strcmp(argv[i], "-p") == 0)) && !cmode)
	    if (++i < argc) {
		pmode++;
		strcpy(path, argv[i]);
	    }
	    else
		usage();
	    
	else if (argv[i][0] == '-')
	    usage();
	else if (!pmode && !cmode) {
	    if (strchr(argv[i], DIR) || (strcmp(argv[i], ".") == 0) ||
		(strcmp(argv[i], "..") == 0)) {
		pmode++;
		strcpy(path, argv[i]);
	    }
	    else { 
		cmode++;
		strcpy(cell, argv[i]);
	    }
	}
	else
	    usage();

	if (cmode) {
	    if (((i + 1) < argc) && (strcmp(argv[i + 1], "-k") == 0)) {
		i+=2;
		if (i < argc)
		    strcpy(realm, argv[i]);
		else
		    usage();
	    }
	    /* Add this cell to list of cells */
	    strcpy(cellinfo.cell, cell);
	    strcpy(cellinfo.realm, realm);
	    if ((cur_node = ll_add_node(&cells, ll_tail))) {
		char *new_cellinfo;
		if ((new_cellinfo = copy_cellinfo(&cellinfo)))
		    ll_add_data(cur_node, new_cellinfo);
		else {
		    fprintf(stderr, 
			    "%s: failure copying cellinfo.\n", progname);
		    exit(AKLOG_MISC);
		}
	    }
	    else {
		fprintf(stderr, "%s: failure adding cell to cells list.\n",
			progname);
		exit(AKLOG_MISC);
	    }
	    memset(&cellinfo, 0, sizeof(cellinfo));
	    cmode = FALSE;
	    memset(cell, 0, sizeof(cell));
	    memset(realm, 0, sizeof(realm));
	}
	else if (pmode) {
	    /* Add this path to list of paths */
	    if ((cur_node = ll_add_node(&paths, ll_tail))) {
		char *new_path; 
		if ((new_path = copy_string(path)))
		    ll_add_data(cur_node, new_path);
		else {
		    fprintf(stderr, "%s: failure copying path name.\n",
			    progname);
		    exit(AKLOG_MISC);
		}
	    }
	    else {
		fprintf(stderr, "%s: failure adding path to paths list.\n",
			progname);
		exit(AKLOG_MISC);
	    }
	    pmode = FALSE;
	    memset(path, 0, sizeof(path));
	}
    }

    /*
     * The code that _used_ to be here called setpag().  When you think
     * about this, doing this makes no sense!  setpag() allocates a PAG
     * only for the current process, so the token installed would have
     * not be usable in the parent!  Since ktc_SetToken() now takes a
     * 4th argument to control whether or not we're going to allocate
     * a PAG (and since when you do it _that_ way, it modifies the cred
     * structure of your parent)), why don't we use that instead?
     */

#if 0
    if (afssetpag) {
	   status = setpag();
	   if (dflag) { 
	     int i,j;
		 int gidsetlen = 50;
         int gidset[50];

		 printf("setpag %d\n",status);
	     j = getgroups(gidsetlen,gidset);
         printf("Groups(%d):",j);
         for (i = 0; i<j; i++) {
           printf("%d",gidset[i]);
           if((i+1)<j) printf(",");
         }
         printf("\n");
	   }
	}
#endif
    /* If nothing was given, log to the local cell. */
    if ((cells.nelements + paths.nelements) == 0) {
		struct passwd *pwd;

		status = auth_to_cell(context, NULL, NULL);
	
	 	/* If this cell is linked to a DCE cell, and user 
		 * requested -linked, get tokens for both 
		 * This is very usefull when the AFS cell is linked to a DFS 
	         * cell and this system does not also have DFS. 
	         */

		if (!status && linked && linkedcell[0]) {
				strncpy(linkedcell2,linkedcell,MAXCELLCHARS);
			    if (dflag) {
			        printf("Linked cell: %s\n", linkedcell);
			    }
				status = auth_to_cell(context, linkedcell2, NULL);
		}

		/*
		 * Local hack - if the person has a file in their home
		 * directory called ".xlog", read that for a list of
		 * extra cells to authenticate to
		 */

		if ((pwd = getpwuid(getuid())) != NULL) {
		    struct stat sbuf;
		    FILE *f;
		    char fcell[100], xlog_path[512];

		    strcpy(xlog_path, pwd->pw_dir);
		    strcat(xlog_path, "/.xlog");

		    if ((stat(xlog_path, &sbuf) == 0) &&
			((f = fopen(xlog_path, "r")) != NULL)) {

			if (dflag) {
			    printf("Reading %s for cells to "
				    "authenticate to.\n", xlog_path);
			}

			while (fgets(fcell, 100, f) != NULL) {
			    int auth_status;

			    fcell[strlen(fcell) - 1] = '\0';

			    if (dflag) {
				printf("Found cell %s in %s.\n",
					fcell, xlog_path);
			    }

			    auth_status = auth_to_cell(context, fcell, NULL);
			    if (status == AKLOG_SUCCESS)
				status = auth_status;
			    else
				status = AKLOG_SOMETHINGSWRONG;
			}
		    }
		}
	}
    else {
	/* Log to all cells in the cells list first */
	for (cur_node = cells.first; cur_node; cur_node = cur_node->next) {
	    memcpy((char *)&cellinfo, cur_node->data, sizeof(cellinfo));
	    if ((status = auth_to_cell(context, cellinfo.cell, cellinfo.realm)))
		somethingswrong++;
		else {
			if (linked && linkedcell[0]) {
				strncpy(linkedcell2,linkedcell,MAXCELLCHARS);
                if (dflag) {
                    printf("Linked cell: %s\n",
                        linkedcell);
                }
				if ((status = auth_to_cell(context,linkedcell2,
							 cellinfo.realm)))
				somethingswrong++;
			}
		}
	}
	
	/* Then, log to all paths in the paths list */
	for (cur_node = paths.first; cur_node; cur_node = cur_node->next) {
	    if ((status = auth_to_path(context, cur_node->data)))
		somethingswrong++;
	}
	
	/* 
	 * If only one thing was logged to, we'll return the status 
	 * of the single call.  Otherwise, we'll return a generic
	 * something failed status.
	 */
	if (somethingswrong && ((cells.nelements + paths.nelements) > 1))
	    status = AKLOG_SOMETHINGSWRONG;
    }

    /* If we are keeping track of zephyr subscriptions, print them. */
    if (zsubs) 
	for (cur_node = zsublist.first; cur_node; cur_node = cur_node->next) {
	    printf("zsub: %s\n", cur_node->data);
	}

    /* If we are keeping track of host information, print it. */
    if (hosts)
	for (cur_node = hostlist.first; cur_node; cur_node = cur_node->next) {
	    printf("host: %s\n", cur_node->data);
	}

    exit(status);
}

static int isdir(char *path, unsigned char *val)
{
    struct stat statbuf;

    if (lstat(path, &statbuf) < 0)
	return (-1);
    else {
	if ((statbuf.st_mode & S_IFMT) == S_IFDIR) 
	    *val = TRUE;
	else
	    *val = FALSE;
	return (0);
    }  
}

static krb5_error_code get_credv5_akimpersonate(krb5_context context,
						char* keytab,
						krb5_principal service_principal,
						krb5_principal client_principal,
						time_t starttime,
						time_t endtime,
						int *allowed_enctypes,
						int *paddress,
						krb5_creds** out_creds /* out */ )
{
#if defined(USING_HEIMDAL) || (defined(HAVE_ENCODE_KRB5_ENC_TKT) && defined(HAVE_ENCODE_KRB5_TICKET) && defined(HAVE_KRB5_C_ENCRYPT))
    krb5_error_code code;
    krb5_keytab kt = 0;
    krb5_kt_cursor cursor[1];
    krb5_keytab_entry entry[1];
    krb5_ccache cc = 0;
    krb5_creds *creds = 0;
    krb5_enctype enctype;
    krb5_kvno kvno;
    krb5_keyblock session_key[1];
#if USING_HEIMDAL
    Ticket ticket_reply[1];
    EncTicketPart enc_tkt_reply[1];
    krb5_address address[30];
    krb5_addresses faddr[1];
    int temp_vno[1];
    time_t temp_time[2];
#else
    krb5_ticket ticket_reply[1];
    krb5_enc_tkt_part enc_tkt_reply[1];
    krb5_address address[30], *faddr[30];
#endif
    krb5_data * temp;
    int i;
    static int any_enctype[] = {0};
    *out_creds = 0;
    if (!(creds = malloc(sizeof *creds))) {
        code = ENOMEM;
        goto cleanup;
    }
    if (!allowed_enctypes)
        allowed_enctypes = any_enctype;

    cc = 0;
    enctype = 0; /* AKIMPERSONATE_IGNORE_ENCTYPE */
    kvno = 0; /* AKIMPERSONATE_IGNORE_VNO */
    memset((char*)creds, 0, sizeof *creds);
    memset((char*)entry, 0, sizeof *entry);
    memset((char*)session_key, 0, sizeof *session_key);
    memset((char*)ticket_reply, 0, sizeof *ticket_reply);
    memset((char*)enc_tkt_reply, 0, sizeof *enc_tkt_reply);
    code = krb5_kt_resolve(context, keytab, &kt);
    if (code) {
        if (keytab)
            afs_com_err(progname, code, "while resolving keytab %s", keytab);
        else
            afs_com_err(progname, code, "while resolving default keytab");
        goto cleanup;
    }

    if (service_principal) {
        for (i = 0; (enctype = allowed_enctypes[i]) || !i; ++i) {
	    code = krb5_kt_get_entry(context,
				     kt,
				     service_principal,
				     kvno,
				     enctype,
				     entry);
	    if (!code) {
		if (allowed_enctypes[i])
		    deref_keyblock_enctype(session_key) = allowed_enctypes[i];
		break;
	    }
        }
        if (code) {
	    afs_com_err(progname, code,"while scanning keytab entries");
	    goto cleanup;
        }
    } else {
        krb5_keytab_entry new[1];
        int best = -1;
        memset(new, 0, sizeof *new);
        if ((code == krb5_kt_start_seq_get(context, kt, cursor))) {
            afs_com_err(progname, code, "while starting keytab scan");
            goto cleanup;
        }
        while (!(code = krb5_kt_next_entry(context, kt, new, cursor))) {
            for (i = 0;
                    allowed_enctypes[i] && allowed_enctypes[i]
		     != deref_entry_enctype(new); ++i)
                ;
            if ((!i || allowed_enctypes[i]) &&
		(best < 0 || best > i)) {
                krb5_free_keytab_entry_contents(context, entry);
                *entry = *new;
                memset(new, 0, sizeof *new);
            } else krb5_free_keytab_entry_contents(context, new);
        }
        if ((i = krb5_kt_end_seq_get(context, kt, cursor))) {
            afs_com_err(progname, i, "while ending keytab scan");
            code = i;
            goto cleanup;
        }
        if (best < 0) {
            afs_com_err(progname, code, "while scanning keytab");
            goto cleanup;
        }
        deref_keyblock_enctype(session_key) = deref_entry_enctype(entry);
    }

    /* Make Ticket */

#if USING_HEIMDAL
    if ((code = krb5_generate_random_keyblock(context,
					      deref_keyblock_enctype(session_key), session_key))) {
        afs_com_err(progname, code, "while making session key");
        goto cleanup;
    }
    enc_tkt_reply->flags.initial = 1;
    enc_tkt_reply->transited.tr_type = DOMAIN_X500_COMPRESS;
    enc_tkt_reply->cname = client_principal->name;
    enc_tkt_reply->crealm = client_principal->realm;
    enc_tkt_reply->key = *session_key;
    {
        static krb5_data empty_string;
        enc_tkt_reply->transited.contents = empty_string;
    }
    enc_tkt_reply->authtime = starttime;
    enc_tkt_reply->starttime = temp_time;
    *enc_tkt_reply->starttime = starttime;
#if 0
    enc_tkt_reply->renew_till = temp_time + 1;
    *enc_tkt_reply->renew_till = endtime;
#endif
    enc_tkt_reply->endtime = endtime;
#else
    if ((code = krb5_c_make_random_key(context,
				       deref_keyblock_enctype(session_key), session_key))) {
        afs_com_err(progname, code, "while making session key");
        goto cleanup;
    }
    enc_tkt_reply->magic = KV5M_ENC_TKT_PART;
#define DATACAST        (unsigned char *)
    enc_tkt_reply->flags |= TKT_FLG_INITIAL;
    enc_tkt_reply->transited.tr_type = KRB5_DOMAIN_X500_COMPRESS;
    enc_tkt_reply->session = session_key;
    enc_tkt_reply->client = client_principal;
    {
        static krb5_data empty_string;
        enc_tkt_reply->transited.tr_contents = empty_string;
    }
    enc_tkt_reply->times.authtime = starttime;
    enc_tkt_reply->times.starttime = starttime; /* krb524init needs this */
    enc_tkt_reply->times.endtime = endtime;
#endif  /* USING_HEIMDAL */
    /* NB:  We will discard address for now--ignoring caddr field               
       in any case.  MIT branch does what it always did. */

    if (paddress && *paddress) {
        deref_enc_tkt_addrs(enc_tkt_reply) = faddr;
#if USING_HEIMDAL
        faddr->len = 0;
        faddr->val = address;
#endif
        for (i = 0; paddress[i]; ++i) {
#if USING_HEIMDAL
            address[i].addr_type = KRB5_ADDRESS_INET;
            address[i].address.data = (void*)(paddress+i);
            address[i].address.length = sizeof(paddress[i]);
#else
#if !USING_SSL
            address[i].magic = KV5M_ADDRESS;
            address[i].addrtype = ADDRTYPE_INET;
#else
            address[i].addrtype = AF_INET;
#endif
            address[i].contents = (void*)(paddress+i);
            address[i].length = sizeof(int);
            faddr[i] = address+i;
#endif
        }
#if USING_HEIMDAL
        faddr->len = i;
#else
        faddr[i] = 0;
#endif
    }

#if USING_HEIMDAL
    ticket_reply->sname = service_principal->name;
    ticket_reply->realm = service_principal->realm;

    { /* crypto block */
        krb5_crypto crypto = 0;
        unsigned char *buf = 0;
        size_t buf_size, buf_len;
        char *what;

        ASN1_MALLOC_ENCODE(EncTicketPart, buf, buf_size,
			   enc_tkt_reply, &buf_len, code);
        if(code) {
            afs_com_err(progname, code, "while encoding ticket");
            goto cleanup;
        }

        if(buf_len != buf_size) {
            afs_com_err(progname, code,
		    "%d != %d while encoding ticket (internal ASN.1 encoder error",
		    buf_len, buf_size);
            goto cleanup;
        }
        what = "krb5_crypto_init";
        code = krb5_crypto_init(context,
				&deref_entry_keyblock(entry),
				deref_entry_enctype(entry),
				&crypto);
        if(!code) {
            what = "krb5_encrypt";
            code = krb5_encrypt_EncryptedData(context, crypto, KRB5_KU_TICKET,
					      buf, buf_len, entry->vno, &(ticket_reply->enc_part));
        }
        if (buf) free(buf);
        if (crypto) krb5_crypto_destroy(context, crypto);
        if(code) {
            afs_com_err(progname, code, "while %s", what);
            goto cleanup;
        }
    } /* crypto block */
    ticket_reply->enc_part.etype = deref_entry_enctype(entry);
    ticket_reply->enc_part.kvno = temp_vno;
    *ticket_reply->enc_part.kvno = entry->vno;
    ticket_reply->tkt_vno = 5;
#else
    ticket_reply->server = service_principal;
    ticket_reply->enc_part2 = enc_tkt_reply;
    if ((code = krb5_encrypt_tkt_part(context, &deref_entry_keyblock(entry), ticket_reply))) {
        afs_com_err(progname, code, "while making ticket");
        goto cleanup;
    }
    ticket_reply->enc_part.kvno = entry->vno;
#endif

    /* Construct Creds */

    if ((code = krb5_copy_principal(context, service_principal,
				    &creds->server))) {
        afs_com_err(progname, code, "while copying service principal");
        goto cleanup;
    }
    if ((code = krb5_copy_principal(context, client_principal,
				    &creds->client))) {
        afs_com_err(progname, code, "while copying client principal");
        goto cleanup;
    }
    if ((code = krb5_copy_keyblock_contents(context, session_key,
					    &deref_session_key(creds)))) {
        afs_com_err(progname, code, "while copying session key");
        goto cleanup;
    }

#if USING_HEIMDAL
    creds->times.authtime = enc_tkt_reply->authtime;
    creds->times.starttime = *(enc_tkt_reply->starttime);
    creds->times.endtime = enc_tkt_reply->endtime;
    creds->times.renew_till = 0; /* *(enc_tkt_reply->renew_till) */
    creds->flags.b = enc_tkt_reply->flags;
#else
    creds->times = enc_tkt_reply->times;
    creds->ticket_flags = enc_tkt_reply->flags;
#endif
    if (!deref_enc_tkt_addrs(enc_tkt_reply))
        ;
    else if ((code = krb5_copy_addresses(context,
					 deref_enc_tkt_addrs(enc_tkt_reply), &creds->addresses))) {
        afs_com_err(progname, code, "while copying addresses");
        goto cleanup;
    }

#if USING_HEIMDAL
    {
	size_t creds_tkt_len;
	ASN1_MALLOC_ENCODE(Ticket, creds->ticket.data, creds->ticket.length,
			   ticket_reply, &creds_tkt_len, code);
	if(code) {
	    afs_com_err(progname, code, "while encoding ticket");
	    goto cleanup;
	}
    }
#else
    if ((code = encode_krb5_ticket(ticket_reply, &temp))) {
	afs_com_err(progname, code, "while encoding ticket");
	goto cleanup;
    }
    creds->ticket = *temp;
    free(temp);
#endif
    /* return creds */
    *out_creds = creds;
    creds = 0;
cleanup:
    if (deref_enc_data(&ticket_reply->enc_part))
        free(deref_enc_data(&ticket_reply->enc_part));
    krb5_free_keytab_entry_contents(context, entry);
    if (client_principal)
        krb5_free_principal(context, client_principal);
    if (service_principal)
        krb5_free_principal(context, service_principal);
    if (cc)
        krb5_cc_close(context, cc);
    if (kt)
        krb5_kt_close(context, kt);
    if (creds) krb5_free_creds(context, creds);
    krb5_free_keyblock_contents(context, session_key);
out:
    return code;
#else
    return -1;
#endif
}


static krb5_error_code get_credv5(krb5_context context, 
				  char *name, char *inst, char *realm,
				  krb5_creds **creds)
{
    krb5_creds increds;
    krb5_error_code r;
    static krb5_principal client_principal = 0;

    if (dflag) {
	printf("Getting tickets: %s%s%s@%s\n", name, (inst && inst[0])
	       ? "/" : "", inst ? inst : "", realm);
    }
    
    memset((char *)&increds, 0, sizeof(increds));
/* ANL - instance may be ptr to a null string. Pass null then */
    if ((r = krb5_build_principal(context, &increds.server,
				  strlen(realm), realm,
				  name,
				  (inst && strlen(inst)) ? inst : (void *) NULL,
				  (void *) NULL))) {
        return r;
    }
    

    if (!_krb425_ccache) {
        r = krb5_cc_default(context, &_krb425_ccache);
	if (r)
	    return r;
    }
    if (!client_principal) {
	if (client) {
	    r = krb5_parse_name(context, client,  &client_principal);
	} else {
	    r = krb5_cc_get_principal(context, _krb425_ccache, &client_principal);
	}
	if (r)
	    return r;
    }
    
    increds.client = client_principal;
    increds.times.endtime = 0;
    /* Ask for DES since that is what V4 understands */
    get_creds_enctype((&increds)) = ENCTYPE_DES_CBC_CRC;
    
    if (keytab) {
	int allowed_enctypes[] = {
	    ENCTYPE_DES_CBC_CRC, 0
	};

	r = get_credv5_akimpersonate(context,
				     keytab,
				     increds.server,
				     increds.client,
				     300, ((~0U)>>1),
				     allowed_enctypes,
				     0 /* paddress */,
				     creds /* out */);
    } else {
	r = krb5_get_credentials(context, 0, _krb425_ccache, &increds, creds);
    }    
    return r;
}


static int get_user_realm(krb5_context context, char *realm)
{
    static krb5_principal client_principal = 0;
    int i;
    krb5_error_code r = 0;

    if (!_krb425_ccache)
        krb5_cc_default(context, &_krb425_ccache);
    if (!client_principal) {
	if (client) {
	    r = krb5_parse_name(context, client,  &client_principal);
	} else {
	    r = krb5_cc_get_principal(context, _krb425_ccache, &client_principal);
	}
	if (r)
	    return r;
    }

    i = realm_len(context, client_principal);
    if (i > REALM_SZ-1) i = REALM_SZ-1;
    strncpy(realm,realm_data(context, client_principal), i);
    realm[i] = 0;

    return(r);
}
