/*
 * 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
 */

/* Read a VLDB file and verify it for correctness */

#define VL  0x001      /* good volume entry */
#define FR  0x002      /* free volume entry */
#define MH  0x004      /* multi-homed entry */

#define RWH 0x010      /* on rw hash chain */
#define ROH 0x020      /* on ro hash chain */
#define BKH 0x040      /* on bk hash chain */
#define NH  0x080      /* on name hash chain */

#define MHC 0x100      /* on multihomed chain */
#define FRC 0x200      /* on free chain */

#include <afs/param.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#ifdef AFS_NT40_ENV
#include <winsock2.h>
#include <WINNT/afsevent.h>
#include <io.h>
#else
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#endif
#include "vlserver.h"
#include "vldbint.h"
#include <ubik.h>
#include <afs/afsutil.h>
#include <afs/cmd.h>

int fd;
int listentries, listservers, listheader, listuheader, verbose;

struct er {
  long addr;
  int  type;
} *record;
int serveraddrs[MAXSERVERID+2];
  

#define HDRSIZE 64
int readUbikHeader()
{
  int offset, r;
  struct ubik_hdr uheader;

  offset = lseek(fd, 0, 0);
  if (offset != 0) {
     printf("error: lseek to 0 failed: %d %d\n", offset, errno);
     return(-1);
  }

  /* now read the info */
  r = read(fd, &uheader, sizeof(uheader));
  if (r != sizeof(uheader)) {
     printf("error: read of %d bytes failed: %d %d\n", sizeof(uheader), r, errno);
     return(-1);
  }

  uheader.magic = ntohl(uheader.magic);
  uheader.size  = ntohl(uheader.size);
  uheader.version.epoch   = ntohl(uheader.version.epoch);
  uheader.version.counter = ntohl(uheader.version.counter);

  if (listuheader) {
     printf("Ubik Header\n");
     printf("   Magic           = 0x%x\n", uheader.magic);
     printf("   Size            = %u\n",   uheader.size);
     printf("   Version.epoch   = %u\n",   uheader.version.epoch);
     printf("   Version.counter = %u\n",   uheader.version.counter);
  }

  if (uheader.size != HDRSIZE)
     printf("Ubik header size is %u (should be %u)\n", uheader.size, HDRSIZE);
  if (uheader.magic != UBIK_MAGIC)
     printf("Ubik header magic is 0x%x (should be 0x%x)\n", uheader.magic, UBIK_MAGIC);

  return(0);
}

int vldbread(position,buffer,size)
  int position;
  char *buffer;
  int size;
{
  int offset, r, p;

  /* seek to the correct spot. skip ubik stuff */
  p = position + HDRSIZE;
  offset = lseek(fd, p, 0);
  if (offset != p) {
     printf("error: lseek to %d failed: %d %d\n", p, offset, errno);
     return(-1);
  }

  /* now read the info */
  r = read(fd, buffer, size);
  if (r != size) {
     printf("error: read of %d bytes failed: %d %d\n", size, r, errno);
     return(-1);
  }
  return(0);
}

char *vtype(type)
  int type;
{
  static char Type[3];

  if      (type == 0) strcpy(Type,"rw");
  else if (type == 1) strcpy(Type,"ro");
  else if (type == 2) strcpy(Type,"bk");
  else                strcpy(Type,"??");
  return(Type);
}

afs_int32 NameHash(volname)
   char *volname;
{
   unsigned int hash;
   int i;
   char *vchar;

   hash = 0;
   for (vchar=volname+strlen(volname)-1; vchar >= volname; vchar--)
      hash = (hash*63) + (*((unsigned char *)vchar) - 63);
   return(hash % HASHSIZE);
}

afs_int32 IdHash(volid)
   afs_int32 volid;
{
   return((abs(volid)) % HASHSIZE);
}

#define LEGALCHARS ".ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"
int InvalidVolname(volname)
  char *volname;
{
  char *map;
  int slen;

  map = LEGALCHARS;
  slen = strlen(volname);
  if (slen >= VL_MAXNAMELEN) return 1;
  return (slen != strspn(volname, map));
}

readheader(headerp)
  struct vlheader *headerp;
{
  int i,j;

  vldbread(0, headerp, sizeof(*headerp));

  headerp->vital_header.vldbversion = ntohl(headerp->vital_header.vldbversion);
  headerp->vital_header.headersize  = ntohl(headerp->vital_header.headersize);
  headerp->vital_header.freePtr     = ntohl(headerp->vital_header.freePtr);
  headerp->vital_header.eofPtr      = ntohl(headerp->vital_header.eofPtr);
  headerp->vital_header.allocs      = ntohl(headerp->vital_header.allocs);
  headerp->vital_header.frees       = ntohl(headerp->vital_header.frees);
  headerp->vital_header.MaxVolumeId = ntohl(headerp->vital_header.MaxVolumeId);
  headerp->vital_header.totalEntries[0] = ntohl(headerp->vital_header.totalEntries[0]);
  for (i=0; i<MAXTYPES; i++)
     headerp->vital_header.totalEntries[i] = ntohl(headerp->vital_header.totalEntries[1]);

  headerp->SIT = ntohl(headerp->SIT);
  for (i=0; i<MAXSERVERID; i++)
     headerp->IpMappedAddr[i] = ntohl(headerp->IpMappedAddr[i]);
  for (i=0; i<HASHSIZE; i++)
     headerp->VolnameHash[i] = ntohl(headerp->VolnameHash[i]);
  for (i=0; i<MAXTYPES; i++) 
     for (j=0; j<HASHSIZE; j++) 
        headerp->VolidHash[i][j] = ntohl(headerp->VolidHash[i][j]);

  if (listheader) {
     printf("vldb header\n");
     printf("   vldbversion      = %u\n", headerp->vital_header.vldbversion);
     printf("   headersize       = %u [actual=%u]\n",
	    headerp->vital_header.headersize, sizeof(*headerp));
     printf("   freePtr          = 0x%x\n", headerp->vital_header.freePtr);
     printf("   eofPtr           = %u\n", headerp->vital_header.eofPtr);
     printf("   allocblock calls = %10u\n", headerp->vital_header.allocs);
     printf("   freeblock  calls = %10u\n", headerp->vital_header.frees);
     printf("   MaxVolumeId      = %u\n", headerp->vital_header.MaxVolumeId);
     printf("   rw vol entries   = %u\n", headerp->vital_header.totalEntries[0]);
     printf("   ro vol entries   = %u\n", headerp->vital_header.totalEntries[1]);
     printf("   bk vol entries   = %u\n", headerp->vital_header.totalEntries[2]);
     printf("   multihome info   = 0x%x (%u)\n", headerp->SIT, headerp->SIT);
     printf("   server ip addr   table: size = %d entries\n", MAXSERVERID+1);
     printf("   volume name hash table: size = %d buckets\n", HASHSIZE);
     printf("   volume id   hash table: %d tables with %d buckets each\n",
	    MAXTYPES, HASHSIZE);
  }

  /* Check the header size */
  if (headerp->vital_header.headersize != sizeof(*headerp))
     printf("Header reports its size as %d (should be %d)\n",
	    headerp->vital_header.headersize, sizeof(*headerp));
}

readMH(addr, mhblockP)
  afs_int32 addr;
  struct extentaddr *mhblockP;
{
  int i, j;
  struct extentaddr *e;

  vldbread(addr, mhblockP, VL_ADDREXTBLK_SIZE);

  mhblockP->ex_count = ntohl(mhblockP->ex_count);
  mhblockP->ex_flags = ntohl(mhblockP->ex_flags);
  for (i=0; i<VL_MAX_ADDREXTBLKS; i++)
     mhblockP->ex_contaddrs[i] = ntohl(mhblockP->ex_contaddrs[i]);

  for (i=1; i<VL_MHSRV_PERBLK; i++) {
     e = &(mhblockP[i]);

     /* won't convert hostuuid */
     e->ex_uniquifier = ntohl(e->ex_uniquifier);
     for (j=0; j<VL_MAXIPADDRS_PERMH; j++)
        e->ex_addrs[j] = ntohl(e->ex_addrs[j]);
  }
}     

readentry(addr, vlentryp, type)
  afs_int32 addr;
  struct nvlentry *vlentryp;
  afs_int32 *type;
{
  int i;

  vldbread(addr, vlentryp, sizeof(*vlentryp));

  for (i=0; i<MAXTYPES; i++)
     vlentryp->volumeId[i]   = ntohl(vlentryp->volumeId[i]);
  vlentryp->flags            = ntohl(vlentryp->flags);
  vlentryp->LockAfsId        = ntohl(vlentryp->LockAfsId);
  vlentryp->LockTimestamp    = ntohl(vlentryp->LockTimestamp);
  vlentryp->cloneId          = ntohl(vlentryp->cloneId);
  for (i=0; i<MAXTYPES; i++)    
     vlentryp->nextIdHash[i] = ntohl(vlentryp->nextIdHash[i]);
  vlentryp->nextNameHash     = ntohl(vlentryp->nextNameHash);
  for (i=0; i<NMAXNSERVERS; i++) {
     vlentryp->serverNumber[i]    = ntohl(vlentryp->serverNumber[i]);
     vlentryp->serverPartition[i] = ntohl(vlentryp->serverPartition[i]);
     vlentryp->serverFlags[i]     = ntohl(vlentryp->serverFlags[i]);
  }

  if (vlentryp->flags == VLCONTBLOCK) {
     *type = MH;
  } else if (vlentryp->flags == VLFREE) {
     *type = FR;
  } else {
     *type = VL;
  }

  if (listentries) {
     printf("address %u: ", addr);
     if (vlentryp->flags == VLCONTBLOCK) {
        printf("mh extension block\n");
     } else if (vlentryp->flags == VLFREE) {
        printf("free vlentry\n");
     } else {
        printf("vlentry %s\n", vlentryp->name);
	printf("   rw id = %u ; ro id = %u ; bk id = %u\n",
	       vlentryp->volumeId[0], vlentryp->volumeId[1], vlentryp->volumeId[2]);
	printf("   flags         =");
	   if (vlentryp->flags & VLF_RWEXISTS) printf(" rw");
	   if (vlentryp->flags & VLF_ROEXISTS) printf(" ro");
	   if (vlentryp->flags & VLF_BACKEXISTS) printf(" bk");
	   if (vlentryp->flags & 0xffff8fff) 
	      printf(" errorflag(0x%x)", vlentryp->flags);
	   printf("\n");
	printf("   LockAfsId     = %d\n", vlentryp->LockAfsId);
	printf("   LockTimestamp = %d\n", vlentryp->LockTimestamp);
	printf("   cloneId       = %u\n", vlentryp->cloneId);
	printf("   next hash for rw = %u ; ro = %u ; bk = %u ; name = %u\n",
	       vlentryp->nextIdHash[0], vlentryp->nextIdHash[1], 
	       vlentryp->nextIdHash[2], vlentryp->nextNameHash);
	for (i=0; i<NMAXNSERVERS; i++) {
	   if (vlentryp->serverNumber[i] != 255) {
	      printf("   server %d ; partition %d ; flags =",
		     vlentryp->serverNumber[i], vlentryp->serverPartition[i]);
	      if (vlentryp->serverFlags[i] & VLSF_RWVOL) printf(" rw");
	      if (vlentryp->serverFlags[i] & VLSF_ROVOL) printf(" ro");
	      if (vlentryp->serverFlags[i] & VLSF_BACKVOL) printf(" bk");
	      if (vlentryp->serverFlags[i] & VLSF_NEWREPSITE) printf(" newro");
	      printf("\n");
	   }
	}
     }
  }
}

readSIT(base, addr)
  int base;
  int addr;
{
  int i,j,a;
  char sitbuf[VL_ADDREXTBLK_SIZE];
  struct extentaddr *extent;

  if (!addr)
     return;
  vldbread(addr, sitbuf, VL_ADDREXTBLK_SIZE);
  extent = (struct extentaddr *)sitbuf;

  printf("multihome info block: base %d\n", base);
  if (base == 0) {
     printf("   count = %u\n", ntohl(extent->ex_count));
     printf("   flags = %u\n", ntohl(extent->ex_flags));
     for (i=0; i<VL_MAX_ADDREXTBLKS; i++) {
        printf("   contaddrs[%d] = %u\n", i, ntohl(extent->ex_contaddrs[i]));
     }
  }
  for (i=1; i<VL_MHSRV_PERBLK; i++) {
     /* should we skip this entry */
     for (j=0; j<VL_MAX_ADDREXTBLKS; j++) {
        if (extent[i].ex_addrs[j]) break;
     }
     if (j >= VL_MAX_ADDREXTBLKS) continue;

     printf("   base %d index %d:\n", base, i);
     
     printf("       afsuuid    = (%x %x %x /%d/%d/ /%x/%x/%x/%x/%x/%x/)\n",
	    ntohl(extent[i].ex_hostuuid.time_low),
	    ntohl(extent[i].ex_hostuuid.time_mid),
	    ntohl(extent[i].ex_hostuuid.time_hi_and_version),
	    ntohl(extent[i].ex_hostuuid.clock_seq_hi_and_reserved),
	    ntohl(extent[i].ex_hostuuid.clock_seq_low),
	    ntohl(extent[i].ex_hostuuid.node[0]), ntohl(extent[i].ex_hostuuid.node[1]),
	    ntohl(extent[i].ex_hostuuid.node[2]), ntohl(extent[i].ex_hostuuid.node[3]),
	    ntohl(extent[i].ex_hostuuid.node[4]), ntohl(extent[i].ex_hostuuid.node[5]));
     printf("       uniquifier = %u\n", ntohl(extent[i].ex_uniquifier));
     for (j=0; j<VL_MAXIPADDRS_PERMH; j++) {
        a = ntohl(extent[i].ex_addrs[j]);
        if (a) {
	   printf("       %d.%d.%d.%d\n",
		  (a>>24)&0xff, (a>>16)&0xff,
		  (a>>8) &0xff, (a    )&0xff);
	}
     }
  }
}

/*
 * Read each entry in the database:
 * Record what type of entry it is and its address in the record array.
 * Remember what the maximum volume id we found is and check against the header.
 */
ReadAllEntries(header)
  struct vlheader *header;
{
  afs_int32 type, rindex, i, j, e;
  int freecount=0, mhcount=0, vlcount=0;
  int rwcount=0, rocount=0, bkcount=0;
  struct nvlentry vlentry;
  afs_uint32 addr, entrysize, maxvolid=0;

  if (verbose)
     printf("Read each entry in the database\n");
  for (addr = header->vital_header.headersize;
       addr < header->vital_header.eofPtr; addr += entrysize) {

     /* Remember the highest volume id */
     readentry(addr, &vlentry, &type);
     if (type == VL) {
        if (!(vlentry.flags & VLF_RWEXISTS))
	   printf("WARNING: VLDB entry '%s' has no RW volume\n", vlentry.name);

        for (i=0; i<MAXTYPES; i++)
	   if (maxvolid < vlentry.volumeId[i]) maxvolid = vlentry.volumeId[i];

	e = 1;
	for (j=0; j<NMAXNSERVERS; j++) {
	   if (vlentry.serverNumber[j] == 255) continue;
	   if (vlentry.serverFlags[j] & (VLSF_ROVOL|VLSF_NEWREPSITE)) {
	      rocount++;
	      continue;
	   }
	   if (vlentry.serverFlags[j] & VLSF_RWVOL) {
	      rwcount++;
	      if (vlentry.flags & VLF_BACKEXISTS) bkcount++;
	      continue;
	   }
	   if (e) {
	      printf("VLDB entry '%s' contains an unknown RW/RO index serverFlag\n", 
		     vlentry.name);
	      e = 0;
	   }
	   printf("   index %d : serverNumber %d : serverPartition %d : serverFlag %d\n", 
		  j, vlentry.serverNumber[j], vlentry.serverPartition[j], vlentry.serverFlags[j]);
	}
     }

     rindex = addr/sizeof(vlentry);
     if (record[rindex].type) {
        printf("INTERNAL ERROR: record holder %d already in use\n", rindex);
	return;
     }
     record[rindex].addr = addr;
     record[rindex].type = type;

     /* Determine entrysize and keep count */
     if (type == VL) {
        entrysize = sizeof(vlentry);
	vlcount++;
     } else if (type == FR) {
        entrysize = sizeof(vlentry);
	freecount++;
     } else if (type == MH) {
        entrysize = VL_ADDREXTBLK_SIZE;
	mhcount++;
     } else {
        printf("Unknown entry at %u\n", addr);
     }
  }
  if (verbose) {
     printf("Found %d entries, %d free entries, %d multihomed blocks\n",
	    vlcount, freecount, mhcount);
     printf("Found %d RW volumes, %d BK volumes, %d RO volumes\n",
	    rwcount, bkcount, rocount);
  }

  /* Check the maxmimum volume id in the header */
  if (maxvolid != header->vital_header.MaxVolumeId-1)
     printf("Header's maximum volume id is %u and largest id found in VLDB is %u\n",
	    header->vital_header.MaxVolumeId, maxvolid);
}


/*
 * Follow each Name hash bucket marking it as read in the record array.
 * Record we found it in the name hash within the record array.
 * Check that the name is hashed correctly.
 */
FollowNameHash(header)
  struct vlheader *header;
{
  int count=0, longest=0, shortest=-1, chainlength;
  struct nvlentry vlentry;
  afs_uint32 addr;
  afs_int32 i, type, rindex;

  /* Now follow the Name Hash Table */
  if (verbose)
     printf("Check Volume Name Hash\n");
  for (i=0; i<HASHSIZE; i++) {
     chainlength = 0;
     for (addr = header->VolnameHash[i]; addr; addr=vlentry.nextNameHash) {
        readentry(addr, &vlentry, &type);
	if (type != VL) {
	   printf("Name Hash %d: Bad entry at %u: Not a valid vlentry\n", i, addr);
	   continue;
	}

	rindex = addr/sizeof(vlentry);

	if (record[rindex].addr != addr && record[rindex].addr) {
	   printf("INTERNAL ERROR: addresses %u and %u use same record slot %d\n",
		  record[rindex].addr, addr, rindex);
	}
	if (record[rindex].type & NH) {
	   printf("Name Hash %d: Bad entry '%s': Already in the name hash\n",
		  i, vlentry.name);
	   break;
	}
	record[rindex].type |= NH;

	chainlength++;
	count++;

	/* Hash the name and check if in correct hash table */
	if (NameHash(vlentry.name) != i) {
	   printf("Name Hash %d: Bad entry '%s': Incorrect name hash chain (should be in %d)\n",
		  i, vlentry.name, NameHash(vlentry.name));
	}
     }
     if (chainlength > longest) longest = chainlength;
     if ((shortest == -1) || (chainlength < shortest)) shortest = chainlength;
  }
  if (verbose) {
     printf("%d entries in name hash, longest is %d, shortest is %d, average length is %f\n",
	    count, longest, shortest, ((float)count/(float)HASHSIZE));
  }
}

/*
 * Follow the ID hash chains for the RW, RO, and BK hash tables.
 * Record we found it in the id hash within the record array.
 * Check that the ID is hashed correctly.
 */
FollowIdHash(header)
  struct vlheader *header;
{
  int count=0, longest=0, shortest=-1, chainlength;
  struct nvlentry vlentry;
  afs_uint32 addr;
  afs_int32 i, j, hash, type, rindex;

  /* Now follow the RW, RO, and BK Hash Tables */
  if (verbose)
     printf("Check RW, RO, and BK id Hashes\n");
  for (i=0; i<MAXTYPES; i++) {
     hash = ((i==0)?RWH : ((i==1)?ROH : BKH));
     count = longest = 0; shortest = -1;

     for (j=0; j<HASHSIZE; j++) {
        chainlength = 0;
        for (addr=header->VolidHash[i][j]; addr; addr=vlentry.nextIdHash[i]) {
	   readentry(addr, &vlentry, &type);
	   if (type != VL) {
	      printf("%s Id Hash %d: Bad entry at %u: Not a valid vlentry\n",
		     vtype(i), j, addr);
	      continue;
	   }

	   rindex = addr/sizeof(vlentry);
	   if (record[rindex].addr != addr && record[rindex].addr) {
	      printf("INTERNAL ERROR: addresses %u and %u use same record slot %d\n",
		     record[rindex].addr, addr, rindex);
	   }
	   if (record[rindex].type & hash) {
	      printf("%s Id Hash %d: Bad entry '%s': Already in the the hash table\n",
		     vtype(i), j, vlentry.name);
	      break;
	   } 
	   record[rindex].type |= hash;

	   chainlength++;
	   count++;

	   /* Hash the id and check if in correct hash table */
	   if (IdHash(vlentry.volumeId[i]) != j) {
	      printf("%s Id Hash %d: Bad entry '%s': Incorrect Id hash chain (should be in %d)\n",
		     vtype(i), j, vlentry.name, IdHash(vlentry.volumeId[i]));
	   }
	}

	if (chainlength > longest) longest = chainlength;
	if ((shortest == -1) || (chainlength < shortest)) shortest = chainlength;
     }
     if (verbose) {
        printf("%d entries in %s hash, longest is %d, shortest is %d, average length is %f\n",
	       count, vtype(i), longest, shortest, ((float)count/(float)HASHSIZE));
     }
  }
}

/*
 * Follow the free chain.
 * Record we found it in the free chain within the record array.
 */
FollowFreeChain(header)
  struct vlheader *header;
{
  int count=0;
  struct nvlentry vlentry;
  afs_uint32 addr;
  afs_int32 i, type, rindex;

  /* Now follow the Free Chain */
  if (verbose)
     printf("Check Volume Free Chain\n");
  for (addr=header->vital_header.freePtr; addr; addr=vlentry.nextIdHash[0]) {
     readentry(addr, &vlentry, &type);
     if (type != FR) {
        printf("Free Chain %d: Bad entry at %u: Not a valid free vlentry (0x%x)\n",
	       i, addr, type);
	continue;
     }

     rindex = addr/sizeof(vlentry);
     if (record[rindex].addr != addr && record[rindex].addr) {
        printf("INTERNAL ERROR: addresses %u and %u use same record slot %d\n",
	       record[rindex].addr, addr, rindex);
     }
     if (record[rindex].type & FRC) {
        printf("Free Chain: Bad entry at %u: Already in the free chain\n", addr);
	break;
     }
     record[rindex].type |= FRC;

     count++;
  }
  if (verbose)
     printf("%d entries on free chain\n", count);
}

/*
 * Read each multihomed block and mark it as found in the record.
 * Read each entry in each multihomed block and mark the serveraddrs
 * array with the number of ip addresses found for this entry.
 * 
 * Then read the IpMappedAddr array in the header.
 * Verify that multihomed entries base and index are valid and points to
 * a good multhomed entry.
 * Mark the serveraddrs array with 1 ip address for regular entries.
 * 
 * By the end, the severaddrs array will have a 0 if the entry has no 
 * IP addresses in it or the count of the number of IP addresses.
 *
 * The code does not verify if there are duplicate IP addresses in the 
 * list. The vlserver does this when a fileserver registeres itself.
 */
CheckIpAddrs(header)
  struct vlheader *header;
{
  int mhblocks=0;
  struct nvlentry vlentry;
  afs_uint32 addr;
  afs_int32 i, j, m, rindex;
  afs_int32 mhentries, regentries;
  afs_int32 caddrs[VL_MAX_ADDREXTBLKS];
  char mhblock[VL_ADDREXTBLK_SIZE];
  struct extentaddr *MHblock = (struct extentaddr *)mhblock;
  struct extentaddr *e;
  int ipindex, ipaddrs;
  afsUUID nulluuid;

  bzero(&nulluuid, sizeof(nulluuid));

  if (verbose)
     printf("Check Multihomed blocks\n");

  if (header->SIT) {
     /* Read the first MH block and from it, gather the 
      * addresses of all the mh blocks.
      */
     readMH(header->SIT, MHblock);
     if (MHblock->ex_flags != VLCONTBLOCK) {
        printf("Multihomed Block 0: Bad entry at %u: Not a valid multihomed block\n",
	       header->SIT);
     }

     for (i=0; i<VL_MAX_ADDREXTBLKS; i++) {
        caddrs[i] = MHblock->ex_contaddrs[i];
     }

     if (header->SIT != caddrs[0]) {
        printf("MH block does not point to self %u in header, %u in block\n",
	       header->SIT, caddrs[0]);
     }
     
     /* Now read each MH block and record it in the record array */
     for (i=0; i<VL_MAX_ADDREXTBLKS; i++) {
        if (!caddrs[i]) continue;

	readMH(caddrs[i], MHblock);
	if (MHblock->ex_flags != VLCONTBLOCK) {
	   printf("Multihomed Block 0: Bad entry at %u: Not a valid multihomed block\n",
		  header->SIT);
	}

	rindex = caddrs[i]/sizeof(vlentry);
	if (record[rindex].addr != caddrs[i] && record[rindex].addr) {
	   printf("INTERNAL ERROR: addresses %u and %u use same record slot %d\n",
		  record[rindex].addr, caddrs[i], rindex);
	}
	if (record[rindex].type & FRC) {
	   printf("MH Blocks Chain %d: Bad entry at %u: Already a MH block\n", i, addr);
	   break;
	}
	record[rindex].type |= MHC;
	
	mhblocks++;

	/* Read each entry in a multihomed block. 
	 * Find the pointer to the entry in the IpMappedAddr array and
	 * verify that the entry is good (has IP addresses in it).
	 */
	mhentries = 0;
	for (j=1; j<VL_MHSRV_PERBLK; j++) {
	   e = (struct extentaddr *)&(MHblock[j]);

	   /* Search the IpMappedAddr array for the reference to this entry */
	   for (ipindex=0; ipindex<MAXSERVERID; ipindex++) {
	      if (  ((header->IpMappedAddr[ipindex] & 0xff000000) == 0xff000000) &&
		   (((header->IpMappedAddr[ipindex] & 0x00ff0000)>>16) == i)     &&
		    ((header->IpMappedAddr[ipindex] & 0x0000ffff)      == j) ) {
		 break;
	      }
	   }
	   if (ipindex >= MAXSERVERID) ipindex = -1;
	   else serveraddrs[ipindex] = -1;

	   if (memcmp(&e->ex_hostuuid, &nulluuid, sizeof(afsUUID)) == 0) {
	      if (ipindex != -1) {
		 printf("Server Addrs index %d references null MH block %d, index %d\n", i, j);
		 serveraddrs[ipindex] = 0;     /* avoids printing 2nd error below */
	      }
	      continue;
	   }

	   /* Step through each ip address and count the good addresses */
	   ipaddrs = 0;
	   for (m=0; m<VL_MAXIPADDRS_PERMH; m++) {
	     if (e->ex_addrs[m]) ipaddrs++;
	   }

	   /* If we found any good ip addresses, mark it in the serveraddrs record */
	   if (ipaddrs) {
	      mhentries++;
	      if (ipindex == -1) {
		 printf("MH block %d, index %d: Not referenced by server addrs\n", i, j);
	      } else {
		 serveraddrs[ipindex] = ipaddrs;       /* It is good */
	      }
	   }

	   if (listservers && ipaddrs) {
	      printf("MH block %d, index %d:", i, j);
	      for (m=0; m<VL_MAXIPADDRS_PERMH; m++) {
		 if (!e->ex_addrs[m]) continue;
		 printf(" %d.%d.%d.%d",
			(e->ex_addrs[m]&0xff000000)>>24,
			(e->ex_addrs[m]&0x00ff0000)>>16,
			(e->ex_addrs[m]&0x0000ff00)>>8,
			(e->ex_addrs[m]&0x000000ff));
	      }
	      printf("\n");
	   }
	}
/*
 *      if (mhentries != MHblock->ex_count) {
 *	   printf("MH blocks says it has %d entries (found %d)\n",
 *		  MHblock->ex_count, mhentries);
 *	}
 */
     }
  }
  if (verbose)
     printf("%d multihomed blocks\n", mhblocks);

  /* Check the server addresses */
  if (verbose)
     printf("Check server addresses\n");
  mhentries = regentries = 0;
  for (i=0; i<=MAXSERVERID; i++) {
     if (header->IpMappedAddr[i]) {
        if ((header->IpMappedAddr[i] & 0xff000000) == 0xff000000) {
	   mhentries++;
	   if (((header->IpMappedAddr[i] & 0x00ff0000)>>16) > VL_MAX_ADDREXTBLKS)
	      printf("IP Addr for entry %d: Multihome block is bad (%d)\n",
		     i, ((header->IpMappedAddr[i] & 0x00ff0000)>>16));
	   if ( ((header->IpMappedAddr[i] & 0x0000ffff) > VL_MHSRV_PERBLK) ||
	        ((header->IpMappedAddr[i] & 0x0000ffff) < 1) )
	      printf("IP Addr for entry %d: Multihome index is bad (%d)\n",
		     i, (header->IpMappedAddr[i] & 0x0000ffff));
	   if (serveraddrs[i] == -1) {
	      printf("warning: IP Addr for entry %d: Multihome entry has no ip addresses\n", i);
	      serveraddrs[i] = 0;
	   }
	   if (listservers) {
	      printf("   Server ip addr %d = MH block %d, index %d\n", i,
		     (header->IpMappedAddr[i] & 0x00ff0000)>>16,
		     (header->IpMappedAddr[i] & 0x0000ffff));
	   }
	} else {
	   regentries++;
	   serveraddrs[i] = 1;       /* It is good */
	   if (listservers) {
	      printf("   Server ip addr %d = %d.%d.%d.%d\n", i, 
		     (header->IpMappedAddr[i]&0xff000000)>>24,
		     (header->IpMappedAddr[i]&0x00ff0000)>>16,
		     (header->IpMappedAddr[i]&0x0000ff00)>>8,
		     (header->IpMappedAddr[i]&0x000000ff));
	   }
	}
     }
  }
  if (verbose) {
     printf("%d simple entries, %d multihomed entries, Total = %d\n",
	    regentries, mhentries, mhentries+regentries);
  }

}

WorkerBee(as, arock)
  struct cmd_syndesc *as;
  char *arock;
{
  char *dbfile;
  afs_int32  maxentries, type;
  struct vlheader header;
  struct nvlentry vlentry;
  int i, j, help=0;

  dbfile = as->parms[0].items->data;          /* -database */
  listuheader = (as->parms[1].items ? 1 : 0); /* -uheader  */
  listheader  = (as->parms[2].items ? 1 : 0); /* -vheader  */
  listservers = (as->parms[3].items ? 1 : 0); /* -servers  */
  listentries = (as->parms[4].items ? 1 : 0); /* -entries  */
  verbose     = (as->parms[5].items ? 1 : 0); /* -verbose  */

  /* open the vldb database file */
  fd = open(dbfile, O_RDONLY, 0);
  if (fd < 0) {
     printf("can't open file '%s'. error = %d\n", dbfile, errno);
     return;
  }

  /* read the ubik header and the vldb database header*/
  readUbikHeader();
  readheader(&header);
  if (header.vital_header.vldbversion < 3) {
     printf("does not support vldb with version less than 3\n");
     return;
  }

  maxentries = (header.vital_header.eofPtr / sizeof(vlentry)) + 1;
  record = (struct er *)malloc(maxentries * sizeof(struct er));
  bzero((char *)record, (maxentries * sizeof(struct er)));
  bzero((char *)serveraddrs, sizeof(serveraddrs));

  /* Will fill in the record array of entries it found */
  ReadAllEntries(&header);
  listentries = 0;                /* Listed all the entries */

  /* Check the multihomed blocks for valid entries as well as
   * the IpMappedAddrs array in the header for valid entries.
   */
  CheckIpAddrs(&header);

  /* Follow the hash tables */
  FollowNameHash(&header);
  FollowIdHash(&header);

  /* Follow the chain of free entries */
  FollowFreeChain(&header);

  /* Now check the record we have been keeping for inconsistancies
   * For valid vlentries, also check that the server we point to is 
   * valid (the serveraddrs array).
   */
  if (verbose) 
     printf("Verify each volume entry\n");
  for (i=0; i<maxentries; i++) {
     if (record[i].type == 0) continue;

     /* If a vlentry, verify that its name is valid, its name and ids are
      * on the hash chains, and its server numbers are good.
      */
     if (record[i].type & VL) {
        readentry(record[i].addr, &vlentry, &type);

	if (InvalidVolname(vlentry.name))
	   printf("Volume '%s' at addr has an invalid name\n", vlentry.name, record[i].addr);

        if (!(record[i].type & NH)) 
	   printf("Volume '%s' not found in name hash\n", vlentry.name);

	if (vlentry.volumeId[0] && !(record[i].type & RWH))
	   printf("Volume '%s' id %u not found in RW hash chain\n",
		  vlentry.name, vlentry.volumeId[0]);

	if (vlentry.volumeId[1] && !(record[i].type & ROH))
	   printf("Volume '%s' id %u not found in RO hash chain\n",
		  vlentry.name, vlentry.volumeId[1]);

	if (vlentry.volumeId[2] && !(record[i].type & BKH))
	   printf("Volume '%s' id %u not found in BK hash chain\n",
		  vlentry.name, vlentry.volumeId[2]);

	for (j=0; j<NMAXNSERVERS; j++) {
	   if ( (vlentry.serverNumber[j] != 255) && 
	        (serveraddrs[vlentry.serverNumber[j]] == 0) ) {
	      printf("Volume '%s', index %d points to empty server entry %d\n",
		     vlentry.name, j, vlentry.serverNumber[j]);
	   }
	}

        if (record[i].type & 0xffffff00)
	   printf("Volume '%s' id %u also found on other chains (0x%x)\n",
		  vlentry.name, vlentry.volumeId[0], record[i].type);

     /* A free entry */
     } else if (record[i].type & FR) {
        if (!(record[i].type & FRC))
	   printf("Free vlentry at %u not on free chain\n", record[i].addr);
        
        if (record[i].type & 0xfffffdf0)
	   printf("Free vlentry at %u also found on other chains (0x%x)\n",
		  record[i].addr, record[i].type);

     /* A multihomed entry */
     } else if (record[i].type & MH) {
        if (!(record[i].type & MHC))
	   printf("Multihomed block at %u is orphaned\n", record[i].addr);
        
        if (record[i].type & 0xfffffef0)
	   printf("Multihomed block at %u also found on other chains (0x%x)\n",
		  record[i].addr, record[i].type);

     } else {
        printf("Unknown entry type at %u (0x%x)\n", record[i].addr, record[i].type);
     }
  }
}

main(argc, argv)
  int  argc;
  char **argv;
{
  struct cmd_syndesc *ts;
  struct cmd_item    *ti;

  setlinebuf(stdout);

  ts=cmd_CreateSyntax((char *)0, WorkerBee, (char *) 0, "vldb check");
  cmd_AddParm(ts, "-database", CMD_SINGLE, CMD_REQUIRED, "vldb_file");
  cmd_AddParm(ts, "-uheader",  CMD_FLAG,   CMD_OPTIONAL, "Display UBIK header");
  cmd_AddParm(ts, "-vheader",  CMD_FLAG,   CMD_OPTIONAL, "Display VLDB header");
  cmd_AddParm(ts, "-servers",  CMD_FLAG,   CMD_OPTIONAL, "Display server list");
  cmd_AddParm(ts, "-entries",  CMD_FLAG,   CMD_OPTIONAL, "Display entries");
  cmd_AddParm(ts, "-verbose",  CMD_FLAG,   CMD_OPTIONAL, "verbose");

  return cmd_Dispatch(argc, argv);
}
