/*
 * Copyright 2000, International Business Machines Corporation and others.
 * All Rights Reserved.
 *
 * This software has been released under the terms of the IBM Public
 * License.  For details, see the LICENSE file in the top-level source
 * directory or online at http://www.openafs.org/dl/license10.html
 */

/* Interface and supporting routines for the backup system's ubik database */

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

#ifdef IGNORE_SOME_GCC_WARNINGS
# pragma GCC diagnostic warning "-Wstrict-prototypes"
#endif

#include <sys/types.h>
#include <fcntl.h>
#ifdef AFS_NT40_ENV
#include <winsock2.h>
#elif defined(AFS_SUN5_ENV)
#include <netdb.h>
#else
#include <sys/param.h>		/* for hostnames etc */
#endif
#include <afs/auth.h>
#include <afs/cellconfig.h>
#include <ubik.h>
#include <afs/volser.h>
#include <afs/volser_prototypes.h>
#include <afs/afsutil.h>
#include <afs/bubasics.h>
#include <afs/budb_client.h>
#include <afs/budb.h>
#include <afs/com_err.h>
#include <errno.h>

#include "bc.h"
#include "error_macros.h"
#include "bucoord_internal.h"
#include "bucoord_prototypes.h"

extern char *whoami;

/* -------------------------------------
 * Globals
 * -------------------------------------
 */

struct udbHandleS udbHandle;

/* -------------------------------------
 * interface routines (alphabetic)
 * -------------------------------------
 */

afs_int32 bcdb_AddVolume(struct budb_volumeEntry *veptr)
{
    afs_int32 code;

    code = ubik_BUDB_AddVolume(udbHandle.uh_client, 0, veptr);
    return (code);
}

afs_int32 bcdb_AddVolumes(struct budb_volumeEntry *veptr, afs_int32 count)
{
    struct budb_volumeList volumeList;
    afs_int32 code;

    volumeList.budb_volumeList_len = count;
    volumeList.budb_volumeList_val = veptr;
    code = ubik_BUDB_AddVolumes(udbHandle.uh_client, 0, &volumeList);
    return (code);
}


afs_int32 bcdb_CreateDump(struct budb_dumpEntry *deptr)
{
    afs_int32 code;

    code = ubik_BUDB_CreateDump(udbHandle.uh_client, 0, deptr);
    return (code);
}

afs_int32 bcdb_deleteDump(afs_int32 dumpID, afs_int32 fromTime, afs_int32 toTime,
  budb_dumpsList *dumps)
{
    afs_int32 code;
    budb_dumpsList dumpsList, *dumpsPtr;

    dumpsList.budb_dumpsList_len = 0;
    dumpsList.budb_dumpsList_val = 0;
    dumpsPtr = (dumps ? dumps : &dumpsList);

    code =
	ubik_BUDB_DeleteDump(udbHandle.uh_client, 0, dumpID, fromTime,
		  toTime, dumpsPtr);
    if (dumpsList.budb_dumpsList_val)
	free(dumpsList.budb_dumpsList_val);
    return (code);
}

afs_int32 bcdb_listDumps (afs_int32 sflags, afs_int32 groupId,
			  afs_int32 fromTime, afs_int32 toTime,
			  budb_dumpsList *dumps, budb_dumpsList *flags)
{
    afs_int32 code;
    budb_dumpsList dumpsList, *dumpsPtr;
    budb_dumpsList flagsList, *flagsPtr;

    dumpsList.budb_dumpsList_len = 0;
    dumpsList.budb_dumpsList_val = 0;
    dumpsPtr = (dumps ? dumps : &dumpsList);

    flagsList.budb_dumpsList_len = 0;
    flagsList.budb_dumpsList_val = 0;
    flagsPtr = (flags ? flags : &flagsList);

    code =
	ubik_BUDB_ListDumps(udbHandle.uh_client, 0, sflags, "", groupId,
		  fromTime, toTime, dumpsPtr, flagsPtr);

    if (dumpsList.budb_dumpsList_val)
	free(dumpsList.budb_dumpsList_val);
    if (flagsList.budb_dumpsList_val)
	free(flagsList.budb_dumpsList_val);
    return (code);
}


afs_int32 bcdb_DeleteVDP(char *dumpSetName, char *dumpPath, afs_int32 dumpID)
{
    afs_int32 code;

    code =
	ubik_BUDB_DeleteVDP(udbHandle.uh_client, 0, dumpSetName,
		  dumpPath, dumpID);
    return (code);
}

/* bcdb_FindClone
 *      Returns the clone time of a volume by going up the parent chain.
 *      If no clone time is found, a clone time of 0 is returned, forcing
 *      a full dump.
 * entry:
 *      dumpID - of the first dump to examine.
 *      volName - name of the volume for whom a clone time is required
 *      clonetime - ptr to vbl for returning result
 * exit:
 *      0 - clonetime set appropriately
 *      -1 - error occured in traversing chain, clone time set to 0.
 *      -2 - no clone times found, clone time set to 0
 */

afs_int32 bcdb_FindClone(afs_int32 dumpID, char *volName, afs_int32 *clonetime)
{
    afs_int32 code;
    code =
	ubik_BUDB_FindClone(udbHandle.uh_client, 0, dumpID, volName,
		  clonetime);
    return (code);
}

/* bcdb_FindDump
 *      scan entire database for latest volume dump before adate.  Optimize
 *      further by reading only the first line of the dump and if it is older
 *      than the oldest acceptable dump we've found so far, we don't bother
 *      scanning the dump file we've just opened
 *
 *      Used by restore code when restoring a user requested volume(s)
 * entry:
 *      volumeName - name of volume to match on
 *      beforeDate - look for dumps older than this date
 * exit:
 *      deptr - desciptor of most recent dump
 * notes:
 *      should be able to implement this in a single call rather than
 *      the current multiple bcdb_ call algorithm.
 */

int
bcdb_FindDump(char *volumeName, afs_int32 beforeDate,
	      struct budb_dumpEntry *deptr)
{
    afs_int32 code;
    code =
	ubik_BUDB_FindDump(udbHandle.uh_client, 0, volumeName,
		  beforeDate, deptr);
    return (code);
}

/* bcdb_FindDumpByID
 *	find a dump by id. Currently insists on a single return value.
 * entry:
 *	dumpID - id to lookup
 * exit:
 */
int
bcdb_FindDumpByID(afs_int32 dumpID, struct budb_dumpEntry *deptr)
{
    afs_int32 code;
    afs_int32 nextindex;
    afs_int32 dbTime;
    budb_dumpList dl;

    /* initialize the dump list */
    dl.budb_dumpList_len = 0;
    dl.budb_dumpList_val = 0;

    /* outline algorithm */
    code = ubik_BUDB_GetDumps(udbHandle.uh_client, 0, BUDB_MAJORVERSION, BUDB_OP_DUMPID, "",	/* no name */
		     dumpID,	/* start */
		     0,		/* end */
		     0,		/* index */
		     &nextindex, &dbTime, &dl);

    if ((code != 0)
	|| (dl.budb_dumpList_len != 1)	/* single retn val expected */
	) {
/*	printf("bcdb_FindDumpByID: code %d, nvalues %d\n",
	       code, dl.budb_dumpList_len); */
	if (code == 0)
	    code = 1;		/* multiple id's */
	goto error;
    }

    memcpy(deptr, dl.budb_dumpList_val, sizeof(*deptr));

  exit:
    if (dl.budb_dumpList_val) {
	/* free any allocated structures */
	free(dl.budb_dumpList_val);
    }
    return (code);

  error:
    memset(deptr, 0, sizeof(*deptr));
    goto exit;
}

/* bcdb_FindLastVolClone
 *      Returns the clone time, from the most recent dump of volName, when
 *      dumped in the volume set volSetName, with dump schedule dumpName.
 *      The clone time can be used to check if the volume has been correctly
 *      re-cloned, and also is used as the time from which to do the current
 *      incremental dump.
 * entry:
 *      volSetName - name of volume set
 *      dumpName - full path of dump node
 *      volName - name of volume for whom a clone time is required
 *      clonetime - ptr to vbl for result
 * exit:
 *      0 - clonetime set appropriately
 * notes:
 *      used only for warning generation. Suggest that this be omitted.
 */

afs_int32
bcdb_FindLastVolClone(char *volSetName, char *dumpName, char *volName,
		      afs_int32 *clonetime)
{
    /* server notes
     * search by dumpName
     * match on volumeset and dump path
     * search for the volume name
     */
    return (0);
}

/* bcdb_FindLatestDump
 *      find the latest dump with volume set component avname and the
 *      specified dump pathname. Used to find a dump, relative to which an
 *      incremental dump can be done. Defines the parent <-> child relations
 *      for restores.
 * entry:
 *      avname: volume set name
 *      dumpPath: full path of dump node
 * exit:
 *      0:  adentry: dump entry structure filled in.
 *      -1: probably an internal error
 *      2: no such entry
 * Notes for 4.0:
 *      Need to store volumeset name in dump in order to implement this.
 *      Need new routine since params are two strings
 */

int
bcdb_FindLatestDump(char *volSetName, char *dumpPath,
		    struct budb_dumpEntry *deptr)
{
    afs_int32 code;
    code =
	ubik_BUDB_FindLatestDump(udbHandle.uh_client, 0, volSetName,
		  dumpPath, deptr);
    return (code);
}


/* bcdb_FindTape
 *	find a tape
 * entry:
 *	dumpid: dump id to which tape beint32s
 *	tapeName: name of tape
 */

int
bcdb_FindTape(afs_int32 dumpid, char *tapeName,
	      struct budb_tapeEntry *teptr)
{
    budb_tapeList tl;
    afs_int32 next;
    afs_int32 dbTime;
    afs_int32 code = 0;

    memset(teptr, 0, sizeof(*teptr));
    tl.budb_tapeList_len = 0;
    tl.budb_tapeList_val = 0;

    code =
	ubik_BUDB_GetTapes(udbHandle.uh_client, 0, BUDB_MAJORVERSION,
		  BUDB_OP_TAPENAME | BUDB_OP_DUMPID, tapeName, dumpid, 0, 0,
		  &next, &dbTime, &tl);

    if (code)
	ERROR(code);

    if (tl.budb_tapeList_len != 1)
	ERROR(BC_NOTUNIQUE);	/* expecting a single descriptor */

    memcpy(teptr, tl.budb_tapeList_val, sizeof(*teptr));

  error_exit:
    if (tl.budb_tapeList_val)
	free(tl.budb_tapeList_val);
    return (code);
}

int
bcdb_FindTapeSeq(afs_int32 dumpid, afs_int32 tapeSeq,
		 struct budb_tapeEntry *teptr)
{
    budb_tapeList tl;
    afs_int32 next;
    afs_int32 dbTime;
    afs_int32 code = 0;

    memset(teptr, 0, sizeof(*teptr));
    tl.budb_tapeList_len = 0;
    tl.budb_tapeList_val = 0;

    code =
	ubik_BUDB_GetTapes(udbHandle.uh_client, 0, BUDB_MAJORVERSION,
		  BUDB_OP_TAPESEQ | BUDB_OP_DUMPID, "", dumpid, tapeSeq, 0,
		  &next, &dbTime, &tl);
    if (code)
	ERROR(code);

    if (tl.budb_tapeList_len != 1)
	ERROR(BC_NOTUNIQUE);	/* expecting a single descriptor */

    memcpy(teptr, tl.budb_tapeList_val, sizeof(*teptr));

  error_exit:
    if (tl.budb_tapeList_val)
	free(tl.budb_tapeList_val);
    return (code);
}

/* bcdb_FindVolumes
 * notes:
 *	- this is part of dblookup. The existing semantics will not work since
 *	they do lookups based on dump id.
 *	- in the restore code, it uses this to extract information about
 *	the volume. Need current semantics. Could filter the output, selecting
 *	on the dumpid.
 *	- Suggest that the lookup be based on volume name only, with optional
 *	match on backup, and readonly volumes.
 *	- Further, need to check if the volume structure returns enough
 *	information
 */

afs_int32
bcdb_FindVolumes(afs_int32 dumpID, char *volumeName,
		 struct budb_volumeEntry *returnArray,
		 afs_int32 last, afs_int32 *next, afs_int32 maxa,
		 afs_int32 *nEntries)
{
    budb_volumeList vl;
    afs_int32 dbTime;
    afs_int32 code;

    vl.budb_volumeList_len = maxa;
    vl.budb_volumeList_val = returnArray;

    /* outline algorithm */
    code = ubik_BUDB_GetVolumes(udbHandle.uh_client, 0, BUDB_MAJORVERSION, BUDB_OP_VOLUMENAME | BUDB_OP_DUMPID, volumeName,	/* name */
		     dumpID,	/* start */
		     0,		/* end */
		     last,	/* index */
		     next,	/* nextindex */
		     &dbTime, &vl);

    *nEntries = vl.budb_volumeList_len;
    return (code);
}

int
bcdb_FinishDump(struct budb_dumpEntry *deptr)
{
    afs_int32 code;
    code = ubik_BUDB_FinishDump(udbHandle.uh_client, 0, deptr);
    return (code);
}

int
bcdb_FinishTape(struct budb_tapeEntry *teptr)
{
    afs_int32 code;
    code = ubik_BUDB_FinishTape(udbHandle.uh_client, 0, teptr);
    return (code);

}

/* bcdb_LookupVolumes
 */

afs_int32
bcdb_LookupVolume(char *volumeName, struct budb_volumeEntry *returnArray,
		  afs_int32 last, afs_int32 *next, afs_int32 maxa,
		  afs_int32 *nEntries)
{
    budb_volumeList vl;
    afs_int32 dbTime;
    afs_int32 code;

    vl.budb_volumeList_len = maxa;
    vl.budb_volumeList_val = returnArray;

    /* outline algorithm */
    code = ubik_BUDB_GetVolumes(udbHandle.uh_client, 0, BUDB_MAJORVERSION, BUDB_OP_VOLUMENAME, volumeName,	/* name */
		     0,		/* start */
		     0,		/* end */
		     last,	/* index */
		     next,	/* nextindex */
		     &dbTime, &vl);
    if (code) {
	*nEntries = 0;
	return (code);
    }
    *nEntries = vl.budb_volumeList_len;
    return (0);
}

int
bcdb_UseTape(struct budb_tapeEntry *teptr, afs_int32 *newFlag)
{
    afs_int32 code;
    code = ubik_BUDB_UseTape(udbHandle.uh_client, 0, teptr, newFlag);
    return (code);
}


/* ---- text configuration handling routines ----
 *
 * notes:
 *	The caller should pass in/out a fid for an unlinked, open file to prevent
 *	tampering with the files contents;
 */

/* bcdb_GetTextFile
 *	extract the specified textType and put it in a temporary, local
 *	file.
 * entry:
 *	ctPtr - ptr to client structure with all the required information
 */

int
bcdb_GetTextFile(udbClientTextP ctPtr)
{
    afs_int32 bufferSize;
    afs_int32 offset, nextOffset;
    charListT charList;
    afs_int32 code = 0;

    /* Initialize charlistT_val. We try to deallocate this structure based on
     * this */
    memset((void *)&charList, 0, sizeof(charList));

    /* check params and cleanup any previous state */
    if (ctPtr->lockHandle == 0)
	ERROR(BUDB_INTERNALERROR);

    if (ctPtr->textStream == NULL)	/* Should have an open stream */
	ERROR(BUDB_INTERNALERROR);

    /* allocate a buffer */
    bufferSize = 1024;
    charList.charListT_val = (char *)malloc(bufferSize);
    if (charList.charListT_val == 0)
	ERROR(BUDB_INTERNALERROR);
    charList.charListT_len = bufferSize;

    offset = 0;
    nextOffset = 0;
    ctPtr->textSize = 0;
    while (nextOffset != -1) {
	offset = nextOffset;
	charList.charListT_len = bufferSize;
	code =
	    ubik_BUDB_GetText(udbHandle.uh_client, 0, ctPtr->lockHandle,
		      ctPtr->textType, bufferSize, offset, &nextOffset,
		      &charList);

	if (code)
	    ERROR(code);

	code =
	    fwrite(charList.charListT_val, sizeof(char),
		   charList.charListT_len, ctPtr->textStream);
	if (ferror(ctPtr->textStream))
	    ERROR(BUDB_INTERNALERROR);

	ctPtr->textSize += charList.charListT_len;
    }

    /* get text version */
    code =
	ubik_BUDB_GetTextVersion(udbHandle.uh_client, 0,
		  ctPtr->textType, &ctPtr->textVersion);
    if (code)
	ERROR(code);

  normal_exit:
    fflush(ctPtr->textStream);	/* debug */

    /* exit, leaving the configuration text file open */
    if (charList.charListT_val)
	free(charList.charListT_val);
    return (code);

  error_exit:
    if (ctPtr->textStream != NULL) {
	fclose(ctPtr->textStream);
	ctPtr->textStream = NULL;
    }
    goto normal_exit;
}


/* bcdb_SaveTextFile
 *	save the text file in ubik database
 * entry:
 *	textType - identifies type of configuration file
 *	filename - where to get the text from
 */

int
bcdb_SaveTextFile(udbClientTextP ctPtr)
{
    afs_int32 bufferSize;
    afs_int32 offset, chunkSize, fileSize;
    charListT charList;
    afs_int32 code = 0;

    /* allocate a buffer */
    bufferSize = 1024;
    charList.charListT_val = (char *)malloc(bufferSize);
    if (charList.charListT_val == 0)
	ERROR(BUDB_INTERNALERROR);
    charList.charListT_len = bufferSize;

    if (ctPtr->textStream == NULL)
	ERROR(BUDB_INTERNALERROR);
    rewind(ctPtr->textStream);

    fileSize = (afs_int32) filesize(ctPtr->textStream);

    afs_dprintf(("filesize is %d\n", fileSize));

    rewind(ctPtr->textStream);

    /* special case empty files */
    if (fileSize == 0) {
	charList.charListT_len = 0;
	code =
	    ubik_BUDB_SaveText(udbHandle.uh_client, 0,
		      ctPtr->lockHandle, ctPtr->textType, 0,
		      BUDB_TEXT_COMPLETE, &charList);
	goto error_exit;
    }

    offset = 0;
    while (fileSize != 0) {
	chunkSize = MIN(fileSize, bufferSize);
	code =
	    fread(charList.charListT_val, sizeof(char), chunkSize,
		  ctPtr->textStream);

	if (code != chunkSize)
	    printf("code = %d\n", code);
	if (ferror(ctPtr->textStream))
	    ERROR(BUDB_INTERNALERROR);

	charList.charListT_len = chunkSize;
	code =
	    ubik_BUDB_SaveText(udbHandle.uh_client, 0,
		      ctPtr->lockHandle, ctPtr->textType, offset,
		      (chunkSize == fileSize) ? BUDB_TEXT_COMPLETE : 0,
		      &charList);
	if (code)
	    ERROR(code);

	fileSize -= chunkSize;
	offset += chunkSize;
    }

  error_exit:
    /* if ( ctPtr->textStream >= 0 )
     * close(ctPtr->textStream); */
    if (charList.charListT_val)
	free(charList.charListT_val);
    return (code);
}

int
bcdb_FindLastTape(afs_int32 dumpID, struct budb_dumpEntry *dumpEntry,
		  struct budb_tapeEntry *tapeEntry,
		  struct budb_volumeEntry *volEntry)
{
    return (ubik_BUDB_FindLastTape(udbHandle.uh_client, 0, dumpID, dumpEntry,
	     tapeEntry, volEntry));
}

int
bcdb_MakeDumpAppended(afs_int32 appendedDumpID, afs_int32 initialDumpID,
		      afs_int32 startTapeSeq)
{
    return (ubik_BUDB_MakeDumpAppended(udbHandle.uh_client, 0, appendedDumpID,
	     initialDumpID, startTapeSeq));
}


/* -------------------------------------
 * misc. support routines
 * -------------------------------------
 */

afs_int32
filesize(FILE *stream)
{
    afs_int32 offset;
    afs_int32 size;

    offset = ftell(stream);
    fseek(stream, (afs_int32) 0, 2);	/* end of file */
    size = ftell(stream);
    fseek(stream, offset, 0);
    return (size);
}


/* ------------------------------------
 * misc. support routines - general text management
 * ------------------------------------
 */


/* bc_LockText
 *	locks the text described by the ctPtr
 * entry:
 *	ctptr - client text ptr
 * exit:
 *	0 - success
 *	n - fail
 */

int
bc_LockText(udbClientTextP ctPtr)
{
    afs_int32 code;
    afs_int32 timeout, j = 0;

    if (ctPtr->lockHandle != 0)
	return (1);		/* already locked */

    timeout =
	((ctPtr->textSize == 0) ? 30 : ((ctPtr->textSize / 50000) + 10));

    while (1) {
	code =
	    ubik_BUDB_GetLock(udbHandle.uh_client, 0,
		      udbHandle.uh_instanceId, ctPtr->textType, timeout,
		      &ctPtr->lockHandle);
	if ((code != BUDB_LOCKED) && (code != BUDB_SELFLOCKED)) {
	    break;
	}

	/* Mention something every 30 seconds */
	if (++j >= 30) {
	    afs_com_err(whoami, code,
		    "; Waiting for db configuration text unlock");
	    j = 0;
	}
#ifdef AFS_PTHREAD_ENV
	sleep(1);
#else
	IOMGR_Sleep(1);
#endif
    }

    /* cleanup */
    if (code)
	ctPtr->lockHandle = 0;
    return (code);
}

/* bc_UnlockText
 *	unlocks the text described by the ctPtr
 * entry:
 *	ctptr - client text ptr
 * exit:
 *	0 - success
 *	n - fail
 */

int
bc_UnlockText(udbClientTextP ctPtr)
{
    afs_int32 code = 0;

    if (ctPtr->lockHandle == 0)
	return (0);

    code =
	ubik_BUDB_FreeLock(udbHandle.uh_client, 0, ctPtr->lockHandle);
    ctPtr->lockHandle = 0;

    /* Don't try to analyse the error. Let the lock timeout */
    return (code);
}

/* bc_CheckTextVersion
 * exit:
 *	0 - version # ok
 *	n - out of date or error
 */

int
bc_CheckTextVersion(udbClientTextP ctPtr)
{
    afs_int32 code;
    afs_uint32 tversion;

    if (ctPtr->textVersion == -1)
	return (BC_VERSIONMISMATCH);

    code =
	ubik_BUDB_GetTextVersion(udbHandle.uh_client, 0,
		  ctPtr->textType, &tversion);
    if (code)
	return (code);
    if (tversion != ctPtr->textVersion)
	return (BC_VERSIONMISMATCH);
    return (0);
}

/* -------------------------------------
 * initialization routines
 * -------------------------------------
 */

static afsconf_secflags
parseSecFlags(int noAuthFlag, int localauth, const char **confdir) {
    afsconf_secflags secFlags;

    secFlags = 0;
    if (noAuthFlag)
	secFlags |= AFSCONF_SECOPTS_NOAUTH;

    if (localauth) {
	secFlags |= AFSCONF_SECOPTS_LOCALAUTH;
	*confdir = AFSDIR_SERVER_ETC_DIRPATH;
    } else {
	*confdir = AFSDIR_CLIENT_ETC_DIRPATH;
    }
    return secFlags;
}

/* vldbClientInit
 *      Initialize a client for the vl ubik database.
 */
int
vldbClientInit(int noAuthFlag, int localauth, char *cellName,
	       struct ubik_client **cstruct,
	       time_t *expires)
{
    afs_int32 code = 0;
    struct afsconf_dir *acdir;
    struct rx_securityClass *sc;
    afs_int32 i, scIndex = RX_SECIDX_NULL;
    struct afsconf_cell info;
    struct rx_connection *serverconns[VLDB_MAXSERVERS];
    afsconf_secflags secFlags;
    const char *confdir;

    secFlags = parseSecFlags(noAuthFlag, localauth, &confdir);
    secFlags |= AFSCONF_SECOPTS_FALLBACK_NULL;

    /* This just preserves old behaviour of using the default cell when
     * passed an empty string */
    if (cellName && cellName[0] == '\0')
	cellName = NULL;

    /* Find out about the given cell */
    acdir = afsconf_Open(confdir);
    if (!acdir) {
	afs_com_err(whoami, 0, "Can't open configuration directory '%s'", confdir);
	ERROR(BC_NOCELLCONFIG);
    }

    code = afsconf_GetCellInfo(acdir, cellName, AFSCONF_VLDBSERVICE, &info);
    if (code) {
	afs_com_err(whoami, code, "; Can't find cell %s's hosts in %s/%s",
		    cellName, confdir, AFSDIR_CELLSERVDB_FILE);
	ERROR(BC_NOCELLCONFIG);
    }

    code = afsconf_PickClientSecObj(acdir, secFlags, &info, cellName,
				    &sc, &scIndex, expires);
    if (code) {
	afs_com_err(whoami, code, "(configuring connection security)");
	ERROR(BC_NOCELLCONFIG);
    }
    if (scIndex == RX_SECIDX_NULL && !noAuthFlag)
	afs_com_err(whoami, 0, "Can't get tokens - running unauthenticated");

    /* tell UV module about default authentication */
    UV_SetSecurity(sc, scIndex);

    if (info.numServers > VLDB_MAXSERVERS) {
	afs_com_err(whoami, 0,
		"Warning: %d VLDB servers exist for cell '%s', can only remember the first %d",
		info.numServers, cellName, VLDB_MAXSERVERS);
	info.numServers = VLDB_MAXSERVERS;
    }

    for (i = 0; i < info.numServers; i++)
	serverconns[i] =
	    rx_NewConnection(info.hostAddr[i].sin_addr.s_addr,
			     info.hostAddr[i].sin_port, USER_SERVICE_ID, sc,
			     scIndex);
    serverconns[i] = 0;

    *cstruct = 0;
    code = ubik_ClientInit(serverconns, cstruct);
    if (code) {
	afs_com_err(whoami, code, "; Can't initialize ubik connection to vldb");
	ERROR(code);
    }

  error_exit:
    if (acdir)
	afsconf_Close(acdir);
    return (code);
}

/* udbClientInit
 *	initialize a client for the backup systems ubik database.
 */

afs_int32
udbClientInit(int noAuthFlag, int localauth, char *cellName)
{
    struct afsconf_cell info;
    struct afsconf_dir *acdir;
    const char *confdir;
    int i;
    afs_int32 secFlags;
    afs_int32 code = 0;

    secFlags = parseSecFlags(noAuthFlag, localauth, &confdir);
    secFlags |= AFSCONF_SECOPTS_FALLBACK_NULL;

    if (cellName && cellName[0] == '\0')
	cellName = NULL;

    acdir = afsconf_Open(confdir);
    if (!acdir) {
	afs_com_err(whoami, 0, "Can't open configuration directory '%s'",
		    confdir);
	ERROR(BC_NOCELLCONFIG);
    }

    code = afsconf_GetCellInfo(acdir, cellName, 0, &info);
    if (code) {
	afs_com_err(whoami, code, "; Can't find cell %s's hosts in %s/%s",
		    cellName, confdir, AFSDIR_CELLSERVDB_FILE);
	ERROR(BC_NOCELLCONFIG);
    }

    code = afsconf_PickClientSecObj(acdir, secFlags, &info, cellName,
				    &udbHandle.uh_secobj,
				    &udbHandle.uh_scIndex, NULL);
    if (code) {
	afs_com_err(whoami, code, "(configuring connection security)");
	ERROR(BC_NOCELLCONFIG);
    }
    if (udbHandle.uh_scIndex == RX_SECIDX_NULL && !noAuthFlag)
	afs_com_err(whoami, 0, "Can't get tokens - running unauthenticated");

    /* We have to have space for the trailing NULL that terminates the server
     * conneciton array - so we can only store MAXSERVERS-1 real elements in
     * that array.
     */
    if (info.numServers >= MAXSERVERS) {
	afs_com_err(whoami, 0,
		"Warning: %d BDB servers exist for cell '%s', can only remember the first %d",
		info.numServers, cellName, MAXSERVERS-1);
	info.numServers = MAXSERVERS - 1;
    }

    /* establish connections to the servers. Check for failed connections? */
    for (i = 0; i < info.numServers; i++) {
	udbHandle.uh_serverConn[i] =
	    rx_NewConnection(info.hostAddr[i].sin_addr.s_addr,
			     htons(AFSCONF_BUDBPORT), BUDB_SERVICE,
			     udbHandle.uh_secobj, udbHandle.uh_scIndex);
    }
    udbHandle.uh_serverConn[i] = 0;

    code = ubik_ClientInit(udbHandle.uh_serverConn, &udbHandle.uh_client);
    if (code) {
	afs_com_err(whoami, code,
		"; Can't initialize ubik connection to backup database");
	ERROR(code);
    }

    /* Try to quickly find a good site by setting deadtime low */
    for (i = 0; i < info.numServers; i++)
	rx_SetConnDeadTime(udbHandle.uh_client->conns[i], 1);
    code =
	ubik_BUDB_GetInstanceId(udbHandle.uh_client, 0,
		  &udbHandle.uh_instanceId);

    /* Reset dead time back up to default */
    for (i = 0; i < info.numServers; i++)
	rx_SetConnDeadTime(udbHandle.uh_client->conns[i], 60);

    /* If did not find a site on first quick pass, try again */
    if (code == -1)
	code =
	    ubik_BUDB_GetInstanceId(udbHandle.uh_client, 0,
		      &udbHandle.uh_instanceId);
    if (code) {
	afs_com_err(whoami, code, "; Can't access backup database");
	ERROR(code);
    }

  error_exit:
    if (acdir)
	afsconf_Close(acdir);
    return (code);
}

/* -------------------------------------
 * specialized ubik support
 * -------------------------------------
 */

#include <rx/xdr.h>
#include <rx/rx.h>
#include <lock.h>

/* notes
 *	1) first call with SINGLESERVER set, record the server to be used.
 *	2) subsequent calls use that server. If a failure is encountered,
 *	   the state is cleaned up and the error returned back to the caller.
 *	3) upon completion, the user must make a dummy call with
 *	   END_SINGLESERVER set, to clean up state.
 *	4) if the vanilla ubik_Call is ever modified, the END_SINGLESERVER
 *	   flag can be discarded. The first call without SINGLESERVER set
 *	   can clean up the state.
 */

struct ubikCallState {
    afs_int32 ucs_flags;	/* state flags */
    afs_int32 ucs_selectedServer;	/* which server selected */
};

static struct ubikCallState uServer;

/* ubik_Call_SingleServer
 *	variant of ubik_Call. This is used by the backup system to initiate
 *	a series of calls to a single ubik server. The first call sets up
 *	process state (not recorded in ubik) that requires all further calls
 *	of that group to be made to the same server process.
 *
 *	call this instead of stub and we'll guarantee to find a host that's up.
 * 	in the future, we should also put in a protocol to find the sync site
 */

afs_int32
ubik_Call_SingleServer(int (*aproc) (), struct ubik_client *aclient,
		       afs_int32 aflags, char *p1, char *p2, char *p3,
		       char *p4, char *p5, char *p6, char *p7, char *p8,
		       char *p9, char *p10, char *p11, char *p12, char *p13,
		       char *p14, char *p15, char *p16)
{
    afs_int32 code;
    afs_int32 someCode, newHost, thisHost;
    afs_int32 i;
    afs_int32 count;
    int chaseCount;
    int pass;
    struct rx_connection *tc;
    struct rx_peer *rxp;

    if ((aflags & (UF_SINGLESERVER | UF_END_SINGLESERVER)) != 0) {
	if (((aflags & UF_SINGLESERVER) != 0)
	    && ((uServer.ucs_flags & UF_SINGLESERVER) != 0)
	    ) {

	    /* have a selected server */
	    tc = aclient->conns[uServer.ucs_selectedServer];

	    code =
		(*aproc) (tc, p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11,
			  p12, p13, p14, p15, p16);
	    if (code) {
		/* error. Clean up single server state */
		memset(&uServer, 0, sizeof(uServer));
	    }
	    return (code);
	} else if ((aflags & UF_END_SINGLESERVER) != 0) {
	    memset(&uServer, 0, sizeof(uServer));
	    return (0);
	}
    }

    someCode = UNOSERVERS;
    chaseCount = 0;
    pass = 0;
    count = 0;
    while (1) {			/*w */

	/* tc is the next conn to try */
	tc = aclient->conns[count];
	if (tc == 0) {
	    if (pass == 0) {
		pass = 1;	/* in pass 1, we look at down hosts, too */
		count = 0;
		continue;
	    } else
		break;		/* nothing left to try */
	}
	if (pass == 0 && (aclient->states[count] & CFLastFailed)) {
	    count++;
	    continue;		/* this guy's down, try someone else first */
	}

	code =
	    (*aproc) (tc, p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12,
		      p13, p14, p15, p16);

	/* note that getting a UNOTSYNC error code back does *not* guarantee
	 * that there is a sync site yet elected.  However, if there is a
	 * sync site out there somewhere, and you're trying an operation that
	 * requires a sync site, ubik will return UNOTSYNC, indicating the
	 * operation won't work until you find a sync site
	 */
	if (code == UNOTSYNC) {	/*ns */
	    /* means that this requires a sync site to work */
	    someCode = code;	/* remember an error, if this fails */

	    /* now see if we can find the sync site host */
	    code = VOTE_GetSyncSite(tc, &newHost);
	    if (code == 0 && newHost != 0) {
		newHost = htonl(newHost);	/* convert back to network order */

		/* position count at the appropriate slot in the client
		 * structure and retry. If we can't find in slot, we'll just
		 * continue through the whole list
		 */
		for (i = 0; i < MAXSERVERS; i++) {	/*f */
		    rxp = rx_PeerOf(aclient->conns[i]);
		    if (!(thisHost = rx_HostOf(rxp))) {
			count++;	/* host not found, try the next dude */
			break;
		    }
		    if (thisHost == newHost) {
			/* avoid asking in a loop */
			if (chaseCount++ > 2)
			    break;
			count = i;	/* we were told to use this one */
			break;
		    }
		}		/*f */
	    } else
		count++;	/* not directed, keep looking for a sync site */
	    continue;
	} /*ns */
	else if (code == UNOQUORUM) {	/* this guy is still recovering */
	    someCode = code;
	    count++;
	    continue;
	} else if (code < 0) {	/* network errors */
	    someCode = code;
	    aclient->states[count] |= CFLastFailed;
	    count++;
	    continue;
	} else {
	    /* ok, operation worked */
	    aclient->states[count] &= ~CFLastFailed;
	    /* either misc ubik code, or misc application code (incl success)
	     */

	    /* if the call succeeded, setup connection state for subsequent
	     * calls
	     */
	    if ((code == 0)
		&& ((aflags & UF_SINGLESERVER) != 0)
		) {
		/* need to save state */
		uServer.ucs_flags = UF_SINGLESERVER;
		uServer.ucs_selectedServer = count;
	    }

	    return code;
	}
    }				/*w */
    return someCode;
}


/* -------------------------------------
 * debug and test routines
 * -------------------------------------
 */

/* udbLocalInit
 *	For testing only. Open a connect to the database server running on
 *	the local host
 * exit:
 *	0 - ubik connection established in the global udbHandle structure
 *	n - error.
 */

int
udbLocalInit(void)
{
    afs_uint32 serverList[MAXSERVERS];
    char hostname[256];
    char *args[3];
    int i;
    afs_int32 code;

    /* get our host name */
    gethostname(hostname, sizeof(hostname));
    /* strcpy(hostname, "hops"); */

    args[0] = "";
    args[1] = "-servers";
    args[2] = hostname;

    code = ubik_ParseClientList(3, args, serverList);
    if (code) {
	afs_com_err(whoami, code, "; udbLocalInit: parsing ubik server list");
	return (-1);
    }

    udbHandle.uh_scIndex = RX_SECIDX_NULL;
    udbHandle.uh_secobj = (struct rx_securityClass *)
	rxnull_NewClientSecurityObject();

    for (i = 0; serverList[i] != 0; i++) {
	udbHandle.uh_serverConn[i] =
	    rx_NewConnection(serverList[i], htons(AFSCONF_BUDBPORT),
			     BUDB_SERVICE, udbHandle.uh_secobj,
			     udbHandle.uh_scIndex);
	if (udbHandle.uh_serverConn[i] == 0) {
	    afs_com_err(whoami, 0, "connection %d failed", i);
	    continue;
	}
    }
    udbHandle.uh_serverConn[i] = 0;
    code = ubik_ClientInit(udbHandle.uh_serverConn, &udbHandle.uh_client);
    if (code) {
	afs_com_err(whoami, code, "; in ubik_ClientInit");
	return (code);
    }

    code =
	ubik_BUDB_GetInstanceId(udbHandle.uh_client, 0,
		  &udbHandle.uh_instanceId);
    if (code) {
	afs_com_err(whoami, code, "; Can't estblish instance Id");
	return (code);
    }

   /* abort: */
    return (0);
}

/* bc_openTextFile - This function opens a temp file to read in the
 * config text recd from the bu server. On Unix, an unlink() is done on
 * the file as soon as it is opened, so when the program exits, the file will
 * be removed automatically, while being invisible while in use.
 * On NT, however, the file must be explicitly deleted after use with an unlink()
 * Input:
 *  Pointer to a udhClientTextP struct. The open stream ptr is stored in
 *           the udbClientTextP.textStream member.
 * Output: The temp file name is returned in tmpFileName. This should be used
 *   to delete the file when done with it.
 * Return Values:
 *     !0: error code
 *     0: Success.
 */
int
bc_openTextFile(udbClientTextP ctPtr, char *tmpFileName)
{
    int code = 0;
#ifdef HAVE_MKSTEMP
    int fd;
#endif

    if (ctPtr->textStream != NULL) {
	fclose(ctPtr->textStream);
	ctPtr->textStream = NULL;
    }

    sprintf(tmpFileName, "%s/bu_XXXXXX", gettmpdir());
#ifdef HAVE_MKSTEMP
    fd = mkstemp(tmpFileName);
    if (fd == -1)
	ERROR(BUDB_INTERNALERROR);
    ctPtr->textStream = fdopen(fd, "w+");
#else
    mktemp(tmpFileName);
    ctPtr->textStream = fopen(tmpFileName, "w+");
#endif
    if (ctPtr->textStream == NULL)
	ERROR(BUDB_INTERNALERROR);

#ifndef AFS_NT40_ENV		/* This can't be done on NT */
    /* make the file invisible to others */
    code = unlink(tmpFileName);
    if (code)
	ERROR(errno);
#endif

    afs_dprintf(("file is %s\n", tmpFileName));

  normal_exit:
    return code;

  error_exit:
    if (ctPtr->textStream != NULL) {
	fclose(ctPtr->textStream);
	ctPtr->textStream = NULL;
    }
    goto normal_exit;
}


/* bc_closeTextFile: This function closes any actual temp files associated with
 * a udbClientText structure.
 * Input: ctPtr->textStream - stream to close
 *        tmpFileName - temp file name to delete
 * RetVal:
 *    0  - Success
 *    !0 - error code
 */
int
bc_closeTextFile(udbClientTextP ctPtr, char *tmpFileName)
{
    int code = 0;

    if (ctPtr->textStream)
	fclose(ctPtr->textStream);

    if (*tmpFileName) {		/* we have a valid name */
	code = unlink(tmpFileName);
	if (code < 0)
	    code = errno;
    }
    return code;
}
