source: vendor/current/lib/ldb/tools/ldbdump.c

/*
   Unix SMB/CIFS implementation.
   simple ldb tdb dump util
   Copyright (C) Andrew Tridgell              2001
   Copyright (C) Andrew Bartlett              2012

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "replace.h"
#include "system/locale.h"
#include "system/time.h"
#include "system/filesys.h"
#include "system/wait.h"
#include <tdb.h>
#include <ldb.h>
#include <ldb_private.h>

static struct ldb_context *ldb;
bool show_index = false;
bool validate_contents = false;

static int traverse_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA _dbuf, void *state)
{
        int ret, i, j;
        struct ldb_dn *dn = state;
        struct ldb_message *msg = talloc_zero(NULL, struct ldb_message);
        struct ldb_val dbuf = {
                .data = _dbuf.dptr,
                .length = _dbuf.dsize,
        };
        struct ldb_ldif ldif = {
                .msg = msg,
                .changetype = LDB_CHANGETYPE_NONE
        };
        if (!msg) {
                return -1;
        }

        ret = ldb_unpack_data(ldb, &dbuf, msg);
        if (ret != 0) {
                fprintf(stderr, "Failed to parse record %*.*s as an LDB record\n", (int)key.dsize, (int)key.dsize, (char *)key.dptr);
                TALLOC_FREE(msg);
                return 0;
        }

        if (dn && ldb_dn_compare(msg->dn, dn) != 0) {
                TALLOC_FREE(msg);
                return 0;
        }

        if (!show_index && ldb_dn_is_special(msg->dn)) {
                const char *dn_lin = ldb_dn_get_linearized(msg->dn);
                if ((strcmp(dn_lin, "@BASEINFO") == 0) || (strncmp(dn_lin, "@INDEX:", strlen("@INDEX:")) == 0)) {
                        /*
                          the user has asked not to show index
                          records. Also exclude BASEINFO as it
                          contains meta-data which will be re-created
                          if this database is restored
                         */
                        TALLOC_FREE(msg);
                        return 0;
                }
        }

        if (!validate_contents || ldb_dn_is_special(msg->dn)) {
                ldb_ldif_write_file(ldb, stdout, &ldif);
                TALLOC_FREE(msg);
                return 0;
        }

        for (i=0;i<msg->num_elements;i++) {
                const struct ldb_schema_attribute *a;

                a = ldb_schema_attribute_by_name(ldb, msg->elements[i].name);
                for (j=0;j<msg->elements[i].num_values;j++) {
                        struct ldb_val v;
                        ret = a->syntax->ldif_write_fn(ldb, msg, &msg->elements[i].values[j], &v);
                        if (ret != 0) {
                                v = msg->elements[i].values[j];
                                if (ldb_should_b64_encode(ldb, &v)) {
                                        v.data = (uint8_t *)ldb_base64_encode(ldb, (char *)v.data, v.length);
                                        v.length = strlen((char *)v.data);
                                }
                                fprintf(stderr, "On %s element %s value %d (%*.*s) failed to convert to LDIF correctly, skipping possibly corrupt record\n",
                                        ldb_dn_get_linearized(msg->dn),
                                        msg->elements[i].name,
                                        j, (int)v.length, (int)v.length,
                                        v.data);
                                TALLOC_FREE(msg);
                                return 0;
                        }
                }
        }
        ldb_ldif_write_file(ldb, stdout, &ldif);
        TALLOC_FREE(msg);

        return 0;
}

static void log_stderr(struct tdb_context *tdb, enum tdb_debug_level level,
                       const char *fmt, ...)
{
        va_list ap;
        const char *name = tdb_name(tdb);
        const char *prefix = "";

        if (!name)
                name = "unnamed";

        switch (level) {
        case TDB_DEBUG_ERROR:
                prefix = "ERROR: ";
                break;
        case TDB_DEBUG_WARNING:
                prefix = "WARNING: ";
                break;
        case TDB_DEBUG_TRACE:
                return;

        default:
        case TDB_DEBUG_FATAL:
                prefix = "FATAL: ";
                break;
        }

        va_start(ap, fmt);
        fprintf(stderr, "tdb(%s): %s", name, prefix);
        vfprintf(stderr, fmt, ap);
        va_end(ap);
}

static void emergency_walk(TDB_DATA key, TDB_DATA dbuf, void *keyname)
{
        traverse_fn(NULL, key, dbuf, keyname);
}

static int dump_tdb(const char *fname, struct ldb_dn *dn, bool emergency)
{
        TDB_CONTEXT *tdb;
        struct tdb_logging_context logfn = { log_stderr };

        tdb = tdb_open_ex(fname, 0, 0, O_RDONLY, 0, &logfn, NULL);
        if (!tdb) {
                fprintf(stderr, "Failed to open %s\n", fname);
                return 1;
        }

        if (emergency) {
                return tdb_rescue(tdb, emergency_walk, dn) == 0;
        }
        return tdb_traverse(tdb, traverse_fn, dn) == -1 ? 1 : 0;
}

static void usage( void)
{
        printf( "Usage: ldbdump [options] <filename>\n\n");
        printf( "   -h          this help message\n");
        printf( "   -d DN       dumps DN only\n");
        printf( "   -e          emergency dump, for corrupt databases\n");
        printf( "   -i          include index and @BASEINFO records in dump\n");
        printf( "   -c          validate contents of the records\n");
}

 int main(int argc, char *argv[])
{
        bool emergency = false;
        int c, rc;
        char *fname;
        struct ldb_dn *dn = NULL;

        ldb = ldb_init(NULL, NULL);
        if (ldb == NULL) {
                fprintf(stderr, "ldb: ldb_init failed()");
                exit(1);
        }

        rc = ldb_modules_hook(ldb, LDB_MODULE_HOOK_CMDLINE_PRECONNECT);
        if (rc != LDB_SUCCESS) {
                fprintf(stderr, "ldb: failed to run preconnect hooks (needed to get Samba LDIF handlers): %s\n", ldb_strerror(rc));
                exit(1);
        }

        if (argc < 2) {
                printf("Usage: ldbdump <fname>\n");
                exit(1);
        }

        while ((c = getopt( argc, argv, "hd:ec")) != -1) {
                switch (c) {
                case 'h':
                        usage();
                        exit( 0);
                case 'd':
                        dn = ldb_dn_new(ldb, ldb, optarg);
                        if (!dn) {
                                fprintf(stderr, "ldb failed to parse %s as a DN\n", optarg);
                                exit(1);
                        }
                        break;
                case 'e':
                        emergency = true;
                        break;
                case 'i':
                        show_index = true;
                        break;
                case 'c':
                        validate_contents = true;
                        break;
                default:
                        usage();
                        exit( 1);
                }
        }

        fname = argv[optind];

        return dump_tdb(fname, dn, emergency);
}