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db_dump.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996, 1997, 1998, 1999, 2000
 *    Sleepycat Software.  All rights reserved.
 */

#include "db_config.h"

#ifndef lint
static const char copyright[] =
    "Copyright (c) 1996-2000\nSleepycat Software Inc.  All rights reserved.\n";
static const char revid[] =
    "$Id: db_dump.c,v 11.41 2001/01/18 18:36:57 bostic Exp $";
#endif

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

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

#include "db_int.h"
#include "db_page.h"
#include "db_shash.h"
#include "btree.h"
#include "hash.h"
#include "lock.h"

void   configure __P((char *));
int    db_init __P((char *));
int    dump __P((DB *, int, int));
int    dump_sub __P((DB *, char *, int, int));
int    is_sub __P((DB *, int *));
int    main __P((int, char *[]));
int    show_subs __P((DB *));
void   usage __P((void));
void   version_check __P((void));

DB_ENV      *dbenv;
const char
      *progname = "db_dump";                    /* Program name. */

int
main(argc, argv)
      int argc;
      char *argv[];
{
      extern char *optarg;
      extern int optind;
      DB *dbp;
      int ch, d_close;
      int e_close, exitval;
      int lflag, nflag, pflag, ret, rflag, Rflag, subs, keyflag;
      char *dopt, *home, *subname;

      version_check();

      dbp = NULL;
      d_close = e_close = exitval = lflag = nflag = pflag = rflag = Rflag = 0;
      keyflag = 0;
      dopt = home = subname = NULL;
      while ((ch = getopt(argc, argv, "d:f:h:klNprRs:V")) != EOF)
            switch (ch) {
            case 'd':
                  dopt = optarg;
                  break;
            case 'f':
                  if (freopen(optarg, "w", stdout) == NULL) {
                        fprintf(stderr, "%s: %s: reopen: %s\n",
                            progname, optarg, strerror(errno));
                        exit (1);
                  }
                  break;
            case 'h':
                  home = optarg;
                  break;
            case 'k':
                  keyflag = 1;
                  break;
            case 'l':
                  lflag = 1;
                  break;
            case 'N':
                  nflag = 1;
                  if ((ret = db_env_set_panicstate(0)) != 0) {
                        fprintf(stderr,
                            "%s: db_env_set_panicstate: %s\n",
                            progname, db_strerror(ret));
                        return (1);
                  }
                  break;
            case 'p':
                  pflag = 1;
                  break;
            case 's':
                  subname = optarg;
                  break;
            case 'R':
                  Rflag = 1;
                  /* DB_AGGRESSIVE requires DB_SALVAGE */
                  /* FALLTHROUGH */
            case 'r':
                  rflag = 1;
                  break;
            case 'V':
                  printf("%s\n", db_version(NULL, NULL, NULL));
                  exit(0);
            case '?':
            default:
                  usage();
            }
      argc -= optind;
      argv += optind;

      if (argc != 1)
            usage();

      if (dopt != NULL && pflag) {
            fprintf(stderr,
                "%s: the -d and -p options may not both be specified\n",
                progname);
            exit (1);
      }
      if (lflag && subname != NULL) {
            fprintf(stderr,
                "%s: the -l and -s options may not both be specified\n",
                progname);
            exit (1);
      }

      if (keyflag && rflag) {
            fprintf(stderr, "%s: %s",
                "the -k and -r or -R options may not both be specified\n",
                progname);
            exit(1);
      }

      if (subname != NULL && rflag) {
            fprintf(stderr, "%s: %s",
                "the -s and -r or R options may not both be specified\n",
                progname);
            exit(1);
      }

      /* Handle possible interruptions. */
      __db_util_siginit();

      /*
       * Create an environment object and initialize it for error
       * reporting.
       */
      if ((ret = db_env_create(&dbenv, 0)) != 0) {
            fprintf(stderr,
                "%s: db_env_create: %s\n", progname, db_strerror(ret));
            goto err;
      }
      e_close = 1;

      dbenv->set_errfile(dbenv, stderr);
      dbenv->set_errpfx(dbenv, progname);

      if (nflag && (ret = dbenv->set_mutexlocks(dbenv, 0)) != 0) {
            dbenv->err(dbenv, ret, "set_mutexlocks");
            goto err;
      }

      /* Initialize the environment. */
      if (db_init(home) != 0)
            goto err;

      /* Create the DB object and open the file. */
      if ((ret = db_create(&dbp, dbenv, 0)) != 0) {
            dbenv->err(dbenv, ret, "db_create");
            goto err;
      }
      d_close = 1;

      /*
       * If we're salvaging, don't do an open;  it might not be safe.
       * Dispatch now into the salvager.
       */
      if (rflag) {
            if ((ret = dbp->verify(dbp, argv[0], NULL, stdout,
                DB_SALVAGE | (Rflag ? DB_AGGRESSIVE : 0))) != 0)
                  goto err;
            exitval = 0;
            goto done;
      }

      if ((ret = dbp->open(dbp,
          argv[0], subname, DB_UNKNOWN, DB_RDONLY, 0)) != 0) {
            dbp->err(dbp, ret, "open: %s", argv[0]);
            goto err;
      }

      if (dopt != NULL) {
            if (__db_dump(dbp, dopt, NULL)) {
                  dbp->err(dbp, ret, "__db_dump: %s", argv[0]);
                  goto err;
            }
      } else if (lflag) {
            if (is_sub(dbp, &subs))
                  goto err;
            if (subs == 0) {
                  dbp->errx(dbp,
                      "%s: does not contain multiple databases", argv[0]);
                  goto err;
            }
            if (show_subs(dbp))
                  goto err;
      } else {
            subs = 0;
            if (subname == NULL && is_sub(dbp, &subs))
                  goto err;
            if (subs) {
                  if (dump_sub(dbp, argv[0], pflag, keyflag))
                        goto err;
            } else
                  if (__db_prheader(dbp, NULL, pflag, keyflag, stdout,
                      __db_verify_callback, NULL, 0) ||
                      dump(dbp, pflag, keyflag))
                        goto err;
      }

      if (0) {
err:        exitval = 1;
      }
done: if (d_close && (ret = dbp->close(dbp, 0)) != 0) {
            exitval = 1;
            dbp->err(dbp, ret, "close");
      }
      if (e_close && (ret = dbenv->close(dbenv, 0)) != 0) {
            exitval = 1;
            fprintf(stderr,
                "%s: dbenv->close: %s\n", progname, db_strerror(ret));
      }

      /* Resend any caught signal. */
      __db_util_sigresend();

      return (exitval);
}

/*
 * db_init --
 *    Initialize the environment.
 */
int
db_init(home)
      char *home;
{
      int ret;

      /*
       * Try and use the underlying environment when opening a database.  We
       * wish to use the buffer pool so our information is as up-to-date as
       * possible, even if the mpool cache hasn't been flushed;  we wish to
       * use the locking system, if present, so that we are safe to use with
       * transactions.  (We don't need to use transactions explicitly, as
       * we're read-only.)
       *
       * Note that in CDB, too, this will configure our environment
       * appropriately, and our cursors will (correctly) do locking as CDB
       * read cursors.
       */
      if (dbenv->open(dbenv, home, DB_JOINENV | DB_USE_ENVIRON, 0) == 0)
            return (0);

      /*
       * An environment is required because we may be trying to look at
       * databases in directories other than the current one.  We could
       * avoid using an environment iff the -h option wasn't specified,
       * but that seems like more work than it's worth.
       *
       * No environment exists (or, at least no environment that includes
       * an mpool region exists).  Create one, but make it private so that
       * no files are actually created.
       */
      if ((ret = dbenv->open(dbenv, home,
          DB_CREATE | DB_INIT_MPOOL | DB_PRIVATE | DB_USE_ENVIRON, 0)) == 0)
            return (0);

      /* An environment is required. */
      dbenv->err(dbenv, ret, "open");
      return (1);
}

/*
 * is_sub --
 *    Return if the database contains subdatabases.
 */
int
is_sub(dbp, yesno)
      DB *dbp;
      int *yesno;
{
      DB_BTREE_STAT *btsp;
      DB_HASH_STAT *hsp;
      int ret;

      switch (dbp->type) {
      case DB_BTREE:
      case DB_RECNO:
            if ((ret = dbp->stat(dbp, &btsp, NULL, 0)) != 0) {
                  dbp->err(dbp, ret, "DB->stat");
                  return (ret);
            }
            *yesno = btsp->bt_metaflags & BTM_SUBDB ? 1 : 0;
            break;
      case DB_HASH:
            if ((ret = dbp->stat(dbp, &hsp, NULL, 0)) != 0) {
                  dbp->err(dbp, ret, "DB->stat");
                  return (ret);
            }
            *yesno = hsp->hash_metaflags & DB_HASH_SUBDB ? 1 : 0;
            break;
      case DB_QUEUE:
            break;
      default:
            dbp->errx(dbp, "unknown database type");
            return (1);
      }
      return (0);
}

/*
 * dump_sub --
 *    Dump out the records for a DB containing subdatabases.
 */
int
dump_sub(parent_dbp, parent_name, pflag, keyflag)
      DB *parent_dbp;
      char *parent_name;
      int pflag, keyflag;
{
      DB *dbp;
      DBC *dbcp;
      DBT key, data;
      int ret;
      char *subdb;

      /*
       * Get a cursor and step through the database, dumping out each
       * subdatabase.
       */
      if ((ret = parent_dbp->cursor(parent_dbp, NULL, &dbcp, 0)) != 0) {
            dbenv->err(dbenv, ret, "DB->cursor");
            return (1);
      }

      memset(&key, 0, sizeof(key));
      memset(&data, 0, sizeof(data));
      while ((ret = dbcp->c_get(dbcp, &key, &data, DB_NEXT)) == 0) {
            /* Nul terminate the subdatabase name. */
            if ((subdb = malloc(key.size + 1)) == NULL) {
                  dbenv->err(dbenv, ENOMEM, NULL);
                  return (1);
            }
            memcpy(subdb, key.data, key.size);
            subdb[key.size] = '\0';

            /* Create the DB object and open the file. */
            if ((ret = db_create(&dbp, dbenv, 0)) != 0) {
                  dbenv->err(dbenv, ret, "db_create");
                  free(subdb);
                  return (1);
            }
            if ((ret = dbp->open(dbp,
                parent_name, subdb, DB_UNKNOWN, DB_RDONLY, 0)) != 0)
                  dbp->err(dbp, ret,
                      "DB->open: %s:%s", parent_name, subdb);
            if (ret == 0 &&
                (__db_prheader(dbp, subdb, pflag, keyflag, stdout,
                __db_verify_callback, NULL, 0) ||
                dump(dbp, pflag, keyflag)))
                  ret = 1;
            (void)dbp->close(dbp, 0);
            free(subdb);
            if (ret != 0)
                  return (1);
      }
      if (ret != DB_NOTFOUND) {
            dbp->err(dbp, ret, "DBcursor->get");
            return (1);
      }

      if ((ret = dbcp->c_close(dbcp)) != 0) {
            dbp->err(dbp, ret, "DBcursor->close");
            return (1);
      }

      return (0);
}

/*
 * show_subs --
 *    Display the subdatabases for a database.
 */
int
show_subs(dbp)
      DB *dbp;
{
      DBC *dbcp;
      DBT key, data;
      int ret;

      /*
       * Get a cursor and step through the database, printing out the key
       * of each key/data pair.
       */
      if ((ret = dbp->cursor(dbp, NULL, &dbcp, 0)) != 0) {
            dbp->err(dbp, ret, "DB->cursor");
            return (1);
      }

      memset(&key, 0, sizeof(key));
      memset(&data, 0, sizeof(data));
      while ((ret = dbcp->c_get(dbcp, &key, &data, DB_NEXT)) == 0) {
            if ((ret = __db_prdbt(&key, 1, NULL, stdout,
                __db_verify_callback, 0, NULL)) != 0) {
                  dbp->errx(dbp, NULL);
                  return (1);
            }
      }
      if (ret != DB_NOTFOUND) {
            dbp->err(dbp, ret, "DBcursor->get");
            return (1);
      }

      if ((ret = dbcp->c_close(dbcp)) != 0) {
            dbp->err(dbp, ret, "DBcursor->close");
            return (1);
      }
      return (0);
}

/*
 * dump --
 *    Dump out the records for a DB.
 */
int
dump(dbp, pflag, keyflag)
      DB *dbp;
      int pflag, keyflag;
{
      DBC *dbcp;
      DBT key, data;
      int ret, is_recno;

      /*
       * Get a cursor and step through the database, printing out each
       * key/data pair.
       */
      if ((ret = dbp->cursor(dbp, NULL, &dbcp, 0)) != 0) {
            dbp->err(dbp, ret, "DB->cursor");
            return (1);
      }

      memset(&key, 0, sizeof(key));
      memset(&data, 0, sizeof(data));
      is_recno = (dbp->type == DB_RECNO || dbp->type == DB_QUEUE);
      keyflag = is_recno ? keyflag : 1;
      while ((ret = dbcp->c_get(dbcp, &key, &data, DB_NEXT)) == 0)
            if ((keyflag && (ret = __db_prdbt(&key,
                pflag, " ", stdout, __db_verify_callback,
                is_recno, NULL)) != 0) || (ret =
                __db_prdbt(&data, pflag, " ", stdout,
                  __db_verify_callback, 0, NULL)) != 0) {
                  dbp->errx(dbp, NULL);
                  return (1);
            }
      if (ret != DB_NOTFOUND) {
            dbp->err(dbp, ret, "DBcursor->get");
            return (1);
      }

      if ((ret = dbcp->c_close(dbcp)) != 0) {
            dbp->err(dbp, ret, "DBcursor->close");
            return (1);
      }

      (void)__db_prfooter(stdout, __db_verify_callback);
      return (0);
}

/*
 * usage --
 *    Display the usage message.
 */
void
usage()
{
      (void)fprintf(stderr, "usage: %s\n",
"db_dump [-klNprRV] [-d ahr] [-f output] [-h home] [-s database] db_file");
      exit(1);
}

void
version_check()
{
      int v_major, v_minor, v_patch;

      /* Make sure we're loaded with the right version of the DB library. */
      (void)db_version(&v_major, &v_minor, &v_patch);
      if (v_major != DB_VERSION_MAJOR ||
          v_minor != DB_VERSION_MINOR || v_patch != DB_VERSION_PATCH) {
            fprintf(stderr,
      "%s: version %d.%d.%d doesn't match library version %d.%d.%d\n",
                progname, DB_VERSION_MAJOR, DB_VERSION_MINOR,
                DB_VERSION_PATCH, v_major, v_minor, v_patch);
            exit (1);
      }
}

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