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ldbedit.c

/* 
   ldb database library

   Copyright (C) Andrew Tridgell  2004

     ** NOTE! The following LGPL license applies to the ldb
     ** library. This does NOT imply that all of Samba is released
     ** under the LGPL
   
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/*
 *  Name: ldb
 *
 *  Component: ldbedit
 *
 *  Description: utility for ldb database editing
 *
 *  Author: Andrew Tridgell
 */

#include "ldb_includes.h"
#include "tools/cmdline.h"

static struct ldb_cmdline *options;

/*
  debug routine 
*/
static void ldif_write_msg(struct ldb_context *ldb, 
                     FILE *f, 
                     enum ldb_changetype changetype,
                     struct ldb_message *msg)
{
      struct ldb_ldif ldif;
      ldif.changetype = changetype;
      ldif.msg = msg;
      ldb_ldif_write_file(ldb, f, &ldif);
}

/*
  modify a database record so msg1 becomes msg2
  returns the number of modified elements
*/
static int modify_record(struct ldb_context *ldb, 
                   struct ldb_message *msg1,
                   struct ldb_message *msg2)
{
      struct ldb_message *mod;

      mod = ldb_msg_diff(ldb, msg1, msg2);
      if (mod == NULL) {
            fprintf(stderr, "Failed to calculate message differences\n");
            return -1;
      }

      if (mod->num_elements == 0) {
            return 0;
      }

      if (options->verbose > 0) {
            ldif_write_msg(ldb, stdout, LDB_CHANGETYPE_MODIFY, mod);
      }

      if (ldb_modify(ldb, mod) != 0) {
            fprintf(stderr, "failed to modify %s - %s\n", 
                  ldb_dn_get_linearized(msg1->dn), ldb_errstring(ldb));
            return -1;
      }

      return mod->num_elements;
}

/*
  find dn in msgs[]
*/
static struct ldb_message *msg_find(struct ldb_context *ldb,
                            struct ldb_message **msgs,
                            int count,
                            struct ldb_dn *dn)
{
      int i;
      for (i=0;i<count;i++) {
            if (ldb_dn_compare(dn, msgs[i]->dn) == 0) {
                  return msgs[i];
            }
      }
      return NULL;
}

/*
  merge the changes in msgs2 into the messages from msgs1
*/
static int merge_edits(struct ldb_context *ldb,
                   struct ldb_message **msgs1, int count1,
                   struct ldb_message **msgs2, int count2)
{
      int i;
      struct ldb_message *msg;
      int ret = 0;
      int adds=0, modifies=0, deletes=0;

      /* do the adds and modifies */
      for (i=0;i<count2;i++) {
            msg = msg_find(ldb, msgs1, count1, msgs2[i]->dn);
            if (!msg) {
                  if (options->verbose > 0) {
                        ldif_write_msg(ldb, stdout, LDB_CHANGETYPE_ADD, msgs2[i]);
                  }
                  if (ldb_add(ldb, msgs2[i]) != 0) {
                        fprintf(stderr, "failed to add %s - %s\n",
                              ldb_dn_get_linearized(msgs2[i]->dn),
                              ldb_errstring(ldb));
                        return -1;
                  }
                  adds++;
            } else {
                  if (modify_record(ldb, msg, msgs2[i]) > 0) {
                        modifies++;
                  }
            }
      }

      /* do the deletes */
      for (i=0;i<count1;i++) {
            msg = msg_find(ldb, msgs2, count2, msgs1[i]->dn);
            if (!msg) {
                  if (options->verbose > 0) {
                        ldif_write_msg(ldb, stdout, LDB_CHANGETYPE_DELETE, msgs1[i]);
                  }
                  if (ldb_delete(ldb, msgs1[i]->dn) != 0) {
                        fprintf(stderr, "failed to delete %s - %s\n",
                              ldb_dn_get_linearized(msgs1[i]->dn),
                              ldb_errstring(ldb));
                        return -1;
                  }
                  deletes++;
            }
      }

      printf("# %d adds  %d modifies  %d deletes\n", adds, modifies, deletes);

      return ret;
}

/*
  save a set of messages as ldif to a file
*/
static int save_ldif(struct ldb_context *ldb, 
                 FILE *f, struct ldb_message **msgs, int count)
{
      int i;

      fprintf(f, "# editing %d records\n", count);

      for (i=0;i<count;i++) {
            struct ldb_ldif ldif;
            fprintf(f, "# record %d\n", i+1);

            ldif.changetype = LDB_CHANGETYPE_NONE;
            ldif.msg = msgs[i];

            ldb_ldif_write_file(ldb, f, &ldif);
      }

      return 0;
}


/*
  edit the ldb search results in msgs using the user selected editor
*/
static int do_edit(struct ldb_context *ldb, struct ldb_message **msgs1, int count1,
               const char *editor)
{
      int fd, ret;
      FILE *f;
      char file_template[] = "/tmp/ldbedit.XXXXXX";
      char *cmd;
      struct ldb_ldif *ldif;
      struct ldb_message **msgs2 = NULL;
      int count2 = 0;

      /* write out the original set of messages to a temporary
         file */
      fd = mkstemp(file_template);

      if (fd == -1) {
            perror(file_template);
            return -1;
      }

      f = fdopen(fd, "r+");

      if (!f) {
            perror("fopen");
            close(fd);
            unlink(file_template);
            return -1;
      }

      if (save_ldif(ldb, f, msgs1, count1) != 0) {
            return -1;
      }

      fclose(f);

      cmd = talloc_asprintf(ldb, "%s %s", editor, file_template);

      if (!cmd) {
            unlink(file_template);
            fprintf(stderr, "out of memory\n");
            return -1;
      }

      /* run the editor */
      ret = system(cmd);
      talloc_free(cmd);

      if (ret != 0) {
            unlink(file_template);
            fprintf(stderr, "edit with %s failed\n", editor);
            return -1;
      }

      /* read the resulting ldif into msgs2 */
      f = fopen(file_template, "r");
      if (!f) {
            perror(file_template);
            return -1;
      }

      while ((ldif = ldb_ldif_read_file(ldb, f))) {
            msgs2 = talloc_realloc(ldb, msgs2, struct ldb_message *, count2+1);
            if (!msgs2) {
                  fprintf(stderr, "out of memory");
                  return -1;
            }
            msgs2[count2++] = ldif->msg;
      }

      fclose(f);
      unlink(file_template);

      return merge_edits(ldb, msgs1, count1, msgs2, count2);
}

static void usage(void)
{
      printf("Usage: ldbedit <options> <expression> <attributes ...>\n");
      printf("Options:\n");
      printf("  -H ldb_url       choose the database (or $LDB_URL)\n");
      printf("  -s base|sub|one  choose search scope\n");
      printf("  -b basedn        choose baseDN\n");
      printf("  -a               edit all records (expression 'objectclass=*')\n");
      printf("  -e editor        choose editor (or $VISUAL or $EDITOR)\n");
      printf("  -v               verbose mode\n");
      exit(1);
}

int main(int argc, const char **argv)
{
      struct ldb_context *ldb;
      struct ldb_result *result = NULL;
      struct ldb_dn *basedn = NULL;
      int ret;
      const char *expression = "(|(objectClass=*)(distinguishedName=*))";
      const char * const * attrs = NULL;

      ldb_global_init();

      ldb = ldb_init(NULL);

      options = ldb_cmdline_process(ldb, argc, argv, usage);

      /* the check for '=' is for compatibility with ldapsearch */
      if (options->argc > 0 && 
          strchr(options->argv[0], '=')) {
            expression = options->argv[0];
            options->argv++;
            options->argc--;
      }

      if (options->argc > 0) {
            attrs = (const char * const *)(options->argv);
      }

      if (options->basedn != NULL) {
            basedn = ldb_dn_new(ldb, ldb, options->basedn);
            if ( ! ldb_dn_validate(basedn)) {
                  printf("Invalid Base DN format\n");
                  exit(1);
            }
      }

      ret = ldb_search(ldb, basedn, options->scope, expression, attrs, &result);
      if (ret != LDB_SUCCESS) {
            printf("search failed - %s\n", ldb_errstring(ldb));
            exit(1);
      }

      if (result->count == 0) {
            printf("no matching records - cannot edit\n");
            return 0;
      }

      do_edit(ldb, result->msgs, result->count, options->editor);

      if (result) {
            ret = talloc_free(result);
            if (ret == -1) {
                  fprintf(stderr, "talloc_free failed\n");
                  exit(1);
            }
      }

      talloc_free(ldb);
      return 0;
}

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