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ldb_controls.c

/* 
   ldb database library

   Copyright (C) Simo Sorce  2005

     ** 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_controls.c
 *
 *  Component: ldb controls utility functions
 *
 *  Description: helper functions for control modules
 *
 *  Author: Simo Sorce
 */

#include "ldb_includes.h"

/* check if a control with the specified "oid" exist and return it */
/* returns NULL if not found */
00039 struct ldb_control *ldb_request_get_control(struct ldb_request *req, const char *oid)
{
      int i;

      /* check if there's a paged request control */
      if (req->controls != NULL) {
            for (i = 0; req->controls[i]; i++) {
                  if (strcmp(oid, req->controls[i]->oid) == 0) {
                        break;
                  }
            }

            return req->controls[i];
      }

      return NULL;
}

/* saves the current controls list into the "saver" and replace the one in req with a new one excluding
the "exclude" control */
/* returns False on error */
int save_controls(struct ldb_control *exclude, struct ldb_request *req, struct ldb_control ***saver)
{
      struct ldb_control **lcs;
      int i, j;

      *saver = req->controls;
      for (i = 0; req->controls[i]; i++);
      if (i == 1) {
            req->controls = NULL;
            return 1;
      }

      lcs = talloc_array(req, struct ldb_control *, i);
      if (!lcs) {
            return 0;
      }

      for (i = 0, j = 0; (*saver)[i]; i++) {
            if (exclude == (*saver)[i]) continue;
            lcs[j] = (*saver)[i];
            j++;
      }
      lcs[j] = NULL;

      req->controls = lcs;
      return 1;
}

/* check if there's any control marked as critical in the list */
/* return True if any, False if none */
int check_critical_controls(struct ldb_control **controls)
{
      int i;

      if (controls == NULL) {
            return 0;
      }

      for (i = 0; controls[i]; i++) {
            if (controls[i]->critical) {
                  return 1;
            }
      }

      return 0;
}

00107 int ldb_request_add_control(struct ldb_request *req, const char *oid, bool critical, void *data)
{
      unsigned n;
      struct ldb_control **ctrls;
      struct ldb_control *ctrl;

      for (n=0; req->controls && req->controls[n];) { n++; }

      ctrls = talloc_realloc(req, req->controls,
                         struct ldb_control *,
                         n + 2);
      if (!ctrls) return LDB_ERR_OPERATIONS_ERROR;
      req->controls = ctrls;
      ctrls[n] = NULL;
      ctrls[n+1] = NULL;

      ctrl = talloc(ctrls, struct ldb_control);
      if (!ctrl) return LDB_ERR_OPERATIONS_ERROR;

      ctrl->oid   = talloc_strdup(ctrl, oid);
      if (!ctrl->oid) return LDB_ERR_OPERATIONS_ERROR;
      ctrl->critical    = critical;
      ctrl->data  = data;

      ctrls[n] = ctrl;
      return LDB_SUCCESS;
}

/* Parse controls from the format used on the command line and in ejs */

00137 struct ldb_control **ldb_parse_control_strings(struct ldb_context *ldb, void *mem_ctx, const char **control_strings)
{
      int i;
      struct ldb_control **ctrl;

      char *error_string = NULL;

      if (control_strings == NULL || control_strings[0] == NULL)
            return NULL;

      for (i = 0; control_strings[i]; i++);

      ctrl = talloc_array(mem_ctx, struct ldb_control *, i + 1);

      for (i = 0; control_strings[i]; i++) {
            if (strncmp(control_strings[i], "vlv:", 4) == 0) {
                  struct ldb_vlv_req_control *control;
                  const char *p;
                  char attr[1024];
                  char ctxid[1024];
                  int crit, bc, ac, os, cc, ret;

                  attr[0] = '\0';
                  ctxid[0] = '\0';
                  p = &(control_strings[i][4]);
                  ret = sscanf(p, "%d:%d:%d:%d:%d:%1023[^$]", &crit, &bc, &ac, &os, &cc, ctxid);
                  if (ret < 5) {
                        ret = sscanf(p, "%d:%d:%d:%1023[^:]:%1023[^$]", &crit, &bc, &ac, attr, ctxid);
                  }
                         
                  if ((ret < 4) || (crit < 0) || (crit > 1)) {
                        error_string = talloc_asprintf(mem_ctx, "invalid server_sort control syntax\n");
                        error_string = talloc_asprintf_append(error_string, " syntax: crit(b):bc(n):ac(n):<os(n):cc(n)|attr(s)>[:ctxid(o)]\n");
                        error_string = talloc_asprintf_append(error_string, "   note: b = boolean, n = number, s = string, o = b64 binary blob");
                        ldb_set_errstring(ldb, error_string);
                        talloc_free(error_string);
                        return NULL;
                  }
                  if (!(ctrl[i] = talloc(ctrl, struct ldb_control))) {
                        ldb_oom(ldb);
                        return NULL;
                  }
                  ctrl[i]->oid = LDB_CONTROL_VLV_REQ_OID;
                  ctrl[i]->critical = crit;
                  if (!(control = talloc(ctrl[i],
                                     struct ldb_vlv_req_control))) {
                        ldb_oom(ldb);
                        return NULL;
                  }
                  control->beforeCount = bc;
                  control->afterCount = ac;
                  if (attr[0]) {
                        control->type = 1;
                        control->match.gtOrEq.value = talloc_strdup(control, attr);
                        control->match.gtOrEq.value_len = strlen(attr);
                  } else {
                        control->type = 0;
                        control->match.byOffset.offset = os;
                        control->match.byOffset.contentCount = cc;
                  }
                  if (ctxid[0]) {
                        control->ctxid_len = ldb_base64_decode(ctxid);
                        control->contextId = (char *)talloc_memdup(control, ctxid, control->ctxid_len);
                  } else {
                        control->ctxid_len = 0;
                        control->contextId = NULL;
                  }
                  ctrl[i]->data = control;

                  continue;
            }

            if (strncmp(control_strings[i], "dirsync:", 8) == 0) {
                  struct ldb_dirsync_control *control;
                  const char *p;
                  char cookie[1024];
                  int crit, flags, max_attrs, ret;
                   
                  cookie[0] = '\0';
                  p = &(control_strings[i][8]);
                  ret = sscanf(p, "%d:%d:%d:%1023[^$]", &crit, &flags, &max_attrs, cookie);

                  if ((ret < 3) || (crit < 0) || (crit > 1) || (flags < 0) || (max_attrs < 0)) {
                        error_string = talloc_asprintf(mem_ctx, "invalid dirsync control syntax\n");
                        error_string = talloc_asprintf_append(error_string, " syntax: crit(b):flags(n):max_attrs(n)[:cookie(o)]\n");
                        error_string = talloc_asprintf_append(error_string, "   note: b = boolean, n = number, o = b64 binary blob");
                        ldb_set_errstring(ldb, error_string);
                        talloc_free(error_string);
                        return NULL;
                  }

                  /* w2k3 seems to ignore the parameter,
                   * but w2k sends a wrong cookie when this value is to small
                   * this would cause looping forever, while getting
                   * the same data and same cookie forever
                   */
                  if (max_attrs == 0) max_attrs = 0x0FFFFFFF;

                  ctrl[i] = talloc(ctrl, struct ldb_control);
                  ctrl[i]->oid = LDB_CONTROL_DIRSYNC_OID;
                  ctrl[i]->critical = crit;
                  control = talloc(ctrl[i], struct ldb_dirsync_control);
                  control->flags = flags;
                  control->max_attributes = max_attrs;
                  if (*cookie) {
                        control->cookie_len = ldb_base64_decode(cookie);
                        control->cookie = (char *)talloc_memdup(control, cookie, control->cookie_len);
                  } else {
                        control->cookie = NULL;
                        control->cookie_len = 0;
                  }
                  ctrl[i]->data = control;

                  continue;
            }

            if (strncmp(control_strings[i], "asq:", 4) == 0) {
                  struct ldb_asq_control *control;
                  const char *p;
                  char attr[256];
                  int crit, ret;

                  attr[0] = '\0';
                  p = &(control_strings[i][4]);
                  ret = sscanf(p, "%d:%255[^$]", &crit, attr);
                  if ((ret != 2) || (crit < 0) || (crit > 1) || (attr[0] == '\0')) {
                        error_string = talloc_asprintf(mem_ctx, "invalid asq control syntax\n");
                        error_string = talloc_asprintf_append(error_string, " syntax: crit(b):attr(s)\n");
                        error_string = talloc_asprintf_append(error_string, "   note: b = boolean, s = string");
                        ldb_set_errstring(ldb, error_string);
                        talloc_free(error_string);
                        return NULL;
                  }

                  ctrl[i] = talloc(ctrl, struct ldb_control);
                  if (!ctrl[i]) {
                        ldb_oom(ldb);
                        return NULL;
                  }
                  ctrl[i]->oid = LDB_CONTROL_ASQ_OID;
                  ctrl[i]->critical = crit;
                  control = talloc(ctrl[i], struct ldb_asq_control);
                  control->request = 1;
                  control->source_attribute = talloc_strdup(control, attr);
                  control->src_attr_len = strlen(attr);
                  ctrl[i]->data = control;

                  continue;
            }

            if (strncmp(control_strings[i], "extended_dn:", 12) == 0) {
                  struct ldb_extended_dn_control *control;
                  const char *p;
                  int crit, type, ret;

                  p = &(control_strings[i][12]);
                  ret = sscanf(p, "%d:%d", &crit, &type);
                  if ((ret != 2) || (crit < 0) || (crit > 1) || (type < 0) || (type > 1)) {
                        error_string = talloc_asprintf(mem_ctx, "invalid extended_dn control syntax\n");
                        error_string = talloc_asprintf_append(error_string, " syntax: crit(b):type(b)\n");
                        error_string = talloc_asprintf_append(error_string, "   note: b = boolean");
                        ldb_set_errstring(ldb, error_string);
                        talloc_free(error_string);
                        return NULL;
                  }

                  ctrl[i] = talloc(ctrl, struct ldb_control);
                  if (!ctrl[i]) {
                        ldb_oom(ldb);
                        return NULL;
                  }
                  ctrl[i]->oid = LDB_CONTROL_EXTENDED_DN_OID;
                  ctrl[i]->critical = crit;
                  control = talloc(ctrl[i], struct ldb_extended_dn_control);
                  control->type = type;
                  ctrl[i]->data = control;

                  continue;
            }

            if (strncmp(control_strings[i], "sd_flags:", 9) == 0) {
                  struct ldb_sd_flags_control *control;
                  const char *p;
                  int crit, ret;
                  unsigned secinfo_flags;

                  p = &(control_strings[i][9]);
                  ret = sscanf(p, "%d:%u", &crit, &secinfo_flags);
                  if ((ret != 2) || (crit < 0) || (crit > 1) || (secinfo_flags < 0) || (secinfo_flags > 0xF)) {
                        error_string = talloc_asprintf(mem_ctx, "invalid sd_flags control syntax\n");
                        error_string = talloc_asprintf_append(error_string, " syntax: crit(b):secinfo_flags(n)\n");
                        error_string = talloc_asprintf_append(error_string, "   note: b = boolean, n = number");
                        ldb_set_errstring(ldb, error_string);
                        talloc_free(error_string);
                        return NULL;
                  }

                  ctrl[i] = talloc(ctrl, struct ldb_control);
                  if (!ctrl[i]) {
                        ldb_oom(ldb);
                        return NULL;
                  }
                  ctrl[i]->oid = LDB_CONTROL_SD_FLAGS_OID;
                  ctrl[i]->critical = crit;
                  control = talloc(ctrl[i], struct ldb_sd_flags_control);
                  control->secinfo_flags = secinfo_flags;
                  ctrl[i]->data = control;

                  continue;
            }

            if (strncmp(control_strings[i], "search_options:", 15) == 0) {
                  struct ldb_search_options_control *control;
                  const char *p;
                  int crit, ret;
                  unsigned search_options;

                  p = &(control_strings[i][15]);
                  ret = sscanf(p, "%d:%u", &crit, &search_options);
                  if ((ret != 2) || (crit < 0) || (crit > 1) || (search_options < 0) || (search_options > 0xF)) {
                        error_string = talloc_asprintf(mem_ctx, "invalid search_options control syntax\n");
                        error_string = talloc_asprintf_append(error_string, " syntax: crit(b):search_options(n)\n");
                        error_string = talloc_asprintf_append(error_string, "   note: b = boolean, n = number");
                        ldb_set_errstring(ldb, error_string);
                        talloc_free(error_string);
                        return NULL;
                  }

                  ctrl[i] = talloc(ctrl, struct ldb_control);
                  if (!ctrl[i]) {
                        ldb_oom(ldb);
                        return NULL;
                  }
                  ctrl[i]->oid = LDB_CONTROL_SEARCH_OPTIONS_OID;
                  ctrl[i]->critical = crit;
                  control = talloc(ctrl[i], struct ldb_search_options_control);
                  control->search_options = search_options;
                  ctrl[i]->data = control;

                  continue;
            }

            if (strncmp(control_strings[i], "domain_scope:", 13) == 0) {
                  const char *p;
                  int crit, ret;

                  p = &(control_strings[i][13]);
                  ret = sscanf(p, "%d", &crit);
                  if ((ret != 1) || (crit < 0) || (crit > 1)) {
                        error_string = talloc_asprintf(mem_ctx, "invalid domain_scope control syntax\n");
                        error_string = talloc_asprintf_append(error_string, " syntax: crit(b)\n");
                        error_string = talloc_asprintf_append(error_string, "   note: b = boolean");
                        ldb_set_errstring(ldb, error_string);
                        talloc_free(error_string);
                        return NULL;
                  }

                  ctrl[i] = talloc(ctrl, struct ldb_control);
                  if (!ctrl[i]) {
                        ldb_oom(ldb);
                        return NULL;
                  }
                  ctrl[i]->oid = LDB_CONTROL_DOMAIN_SCOPE_OID;
                  ctrl[i]->critical = crit;
                  ctrl[i]->data = NULL;

                  continue;
            }

            if (strncmp(control_strings[i], "paged_results:", 14) == 0) {
                  struct ldb_paged_control *control;
                  const char *p;
                  int crit, size, ret;
                   
                  p = &(control_strings[i][14]);
                  ret = sscanf(p, "%d:%d", &crit, &size);

                  if ((ret != 2) || (crit < 0) || (crit > 1) || (size < 0)) {
                        error_string = talloc_asprintf(mem_ctx, "invalid paged_results control syntax\n");
                        error_string = talloc_asprintf_append(error_string, " syntax: crit(b):size(n)\n");
                        error_string = talloc_asprintf_append(error_string, "   note: b = boolean, n = number");
                        ldb_set_errstring(ldb, error_string);
                        talloc_free(error_string);
                        return NULL;
                  }

                  ctrl[i] = talloc(ctrl, struct ldb_control);
                  if (!ctrl[i]) {
                        ldb_oom(ldb);
                        return NULL;
                  }
                  ctrl[i]->oid = LDB_CONTROL_PAGED_RESULTS_OID;
                  ctrl[i]->critical = crit;
                  control = talloc(ctrl[i], struct ldb_paged_control);
                  control->size = size;
                  control->cookie = NULL;
                  control->cookie_len = 0;
                  ctrl[i]->data = control;

                  continue;
            }

            if (strncmp(control_strings[i], "server_sort:", 12) == 0) {
                  struct ldb_server_sort_control **control;
                  const char *p;
                  char attr[256];
                  char rule[128];
                  int crit, rev, ret;

                  attr[0] = '\0';
                  rule[0] = '\0';
                  p = &(control_strings[i][12]);
                  ret = sscanf(p, "%d:%d:%255[^:]:%127[^:]", &crit, &rev, attr, rule);
                  if ((ret < 3) || (crit < 0) || (crit > 1) || (rev < 0 ) || (rev > 1) ||attr[0] == '\0') {
                        error_string = talloc_asprintf(mem_ctx, "invalid server_sort control syntax\n");
                        error_string = talloc_asprintf_append(error_string, " syntax: crit(b):rev(b):attr(s)[:rule(s)]\n");
                        error_string = talloc_asprintf_append(error_string, "   note: b = boolean, s = string");
                        ldb_set_errstring(ldb, error_string);
                        talloc_free(error_string);
                        return NULL;
                  }
                  ctrl[i] = talloc(ctrl, struct ldb_control);
                  if (!ctrl[i]) {
                        ldb_oom(ldb);
                        return NULL;
                  }
                  ctrl[i]->oid = LDB_CONTROL_SERVER_SORT_OID;
                  ctrl[i]->critical = crit;
                  control = talloc_array(ctrl[i], struct ldb_server_sort_control *, 2);
                  control[0] = talloc(control, struct ldb_server_sort_control);
                  control[0]->attributeName = talloc_strdup(control, attr);
                  if (rule[0])
                        control[0]->orderingRule = talloc_strdup(control, rule);
                  else
                        control[0]->orderingRule = NULL;
                  control[0]->reverse = rev;
                  control[1] = NULL;
                  ctrl[i]->data = control;

                  continue;
            }

            if (strncmp(control_strings[i], "notification:", 13) == 0) {
                  const char *p;
                  int crit, ret;

                  p = &(control_strings[i][13]);
                  ret = sscanf(p, "%d", &crit);
                  if ((ret != 1) || (crit < 0) || (crit > 1)) {
                        error_string = talloc_asprintf(mem_ctx, "invalid notification control syntax\n");
                        error_string = talloc_asprintf_append(error_string, " syntax: crit(b)\n");
                        error_string = talloc_asprintf_append(error_string, "   note: b = boolean");
                        ldb_set_errstring(ldb, error_string);
                        talloc_free(error_string);
                        return NULL;
                  }

                  ctrl[i] = talloc(ctrl, struct ldb_control);
                  if (!ctrl[i]) {
                        ldb_oom(ldb);
                        return NULL;
                  }
                  ctrl[i]->oid = LDB_CONTROL_NOTIFICATION_OID;
                  ctrl[i]->critical = crit;
                  ctrl[i]->data = NULL;

                  continue;
            }

            if (strncmp(control_strings[i], "show_deleted:", 13) == 0) {
                  const char *p;
                  int crit, ret;

                  p = &(control_strings[i][13]);
                  ret = sscanf(p, "%d", &crit);
                  if ((ret != 1) || (crit < 0) || (crit > 1)) {
                        error_string = talloc_asprintf(mem_ctx, "invalid show_deleted control syntax\n");
                        error_string = talloc_asprintf_append(error_string, " syntax: crit(b)\n");
                        error_string = talloc_asprintf_append(error_string, "   note: b = boolean");
                        ldb_set_errstring(ldb, error_string);
                        talloc_free(error_string);
                        return NULL;
                  }

                  ctrl[i] = talloc(ctrl, struct ldb_control);
                  if (!ctrl[i]) {
                        ldb_oom(ldb);
                        return NULL;
                  }
                  ctrl[i]->oid = LDB_CONTROL_SHOW_DELETED_OID;
                  ctrl[i]->critical = crit;
                  ctrl[i]->data = NULL;

                  continue;
            }

            if (strncmp(control_strings[i], "permissive_modify:", 18) == 0) {
                  const char *p;
                  int crit, ret;

                  p = &(control_strings[i][18]);
                  ret = sscanf(p, "%d", &crit);
                  if ((ret != 1) || (crit < 0) || (crit > 1)) {
                        error_string = talloc_asprintf(mem_ctx, "invalid permissive_modify control syntax\n");
                        error_string = talloc_asprintf_append(error_string, " syntax: crit(b)\n");
                        error_string = talloc_asprintf_append(error_string, "   note: b = boolean");
                        ldb_set_errstring(ldb, error_string);
                        talloc_free(error_string);
                        return NULL;
                  }

                  ctrl[i] = talloc(ctrl, struct ldb_control);
                  if (!ctrl[i]) {
                        ldb_oom(ldb);
                        return NULL;
                  }
                  ctrl[i]->oid = LDB_CONTROL_PERMISSIVE_MODIFY_OID;
                  ctrl[i]->critical = crit;
                  ctrl[i]->data = NULL;

                  continue;
            }

            /* no controls matched, throw an error */
            ldb_asprintf_errstring(ldb, "Invalid control name: '%s'", control_strings[i]);
            return NULL;
      }

      ctrl[i] = NULL;

      return ctrl;
}



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