Utilities/cmcurl/ldap.c

   1 /***************************************************************************
   2  *                      _   _ ____  _
   3  *  Project         ___| | | |  _ \| |
   4  *                 / __| | | | |_) | |
   5  *                | (__| |_| |  _ <| |___
   6  *                 \___|\___/|_| \_\_____|
   7  *
   8  * Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
   9  *
  10  * This software is licensed as described in the file COPYING, which
  11  * you should have received as part of this distribution. The terms
  12  * are also available at http://curl.haxx.se/docs/copyright.html.
  13  *
  14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
  15  * copies of the Software, and permit persons to whom the Software is
  16  * furnished to do so, under the terms of the COPYING file.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  * $Id: ldap.c,v 1.2 2007-03-15 19:22:13 andy Exp $
  22  ***************************************************************************/
  23
  24 #include "setup.h"
  25
  26 #ifndef CURL_DISABLE_LDAP
  27 /* -- WIN32 approved -- */
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <stdarg.h>
  31 #include <stdlib.h>
  32 #include <ctype.h>
  33 #ifdef HAVE_SYS_TYPES_H
  34 #include <sys/types.h>
  35 #endif
  36 #ifdef HAVE_SYS_STAT_H
  37 #include <sys/stat.h>
  38 #endif
  39 #ifdef NEED_MALLOC_H
  40 #include <malloc.h>
  41 #endif
  42 #include <errno.h>
  43
  44 #if defined(WIN32)
  45 # include <winldap.h>
  46 #endif
  47
  48 #ifdef HAVE_UNISTD_H
  49 # include <unistd.h>
  50 #endif
  51
  52 #ifdef HAVE_DLFCN_H
  53 # include <dlfcn.h>
  54 #endif
  55
  56 #include "urldata.h"
  57 #include <curl/curl.h>
  58 #include "sendf.h"
  59 #include "escape.h"
  60 #include "transfer.h"
  61 #include "strequal.h"
  62 #include "strtok.h"
  63 #include "ldap.h"
  64 #include "memory.h"
  65 #include "base64.h"
  66
  67 #define _MPRINTF_REPLACE /* use our functions only */
  68 #include <curl/mprintf.h>
  69
  70 #include "memdebug.h"
  71
  72 /* WLdap32.dll functions are *not* stdcall. Must call these via __cdecl
  73  * pointers in case libcurl was compiled as fastcall (cl -Gr). Watcom
  74  * uses fastcall by default.
  75  */
  76 #if !defined(WIN32) && !defined(__cdecl)
  77 #define __cdecl
  78 #endif
  79
  80 #ifndef LDAP_SIZELIMIT_EXCEEDED
  81 #define LDAP_SIZELIMIT_EXCEEDED 4
  82 #endif
  83 #ifndef LDAP_VERSION2
  84 #define LDAP_VERSION2 2
  85 #endif
  86 #ifndef LDAP_VERSION3
  87 #define LDAP_VERSION3 3
  88 #endif
  89 #ifndef LDAP_OPT_PROTOCOL_VERSION
  90 #define LDAP_OPT_PROTOCOL_VERSION 0x0011
  91 #endif
  92
  93 #define DLOPEN_MODE   RTLD_LAZY  /*! assume all dlopen() implementations have
  94                                    this */
  95
  96 #if defined(RTLD_LAZY_GLOBAL)    /* It turns out some systems use this: */
  97 # undef  DLOPEN_MODE
  98 # define DLOPEN_MODE  RTLD_LAZY_GLOBAL
  99 #elif defined(RTLD_GLOBAL)
 100 # undef  DLOPEN_MODE
 101 # define DLOPEN_MODE  (RTLD_LAZY | RTLD_GLOBAL)
 102 #endif
 103
 104 #define DYNA_GET_FUNCTION(type, fnc) do { \
 105           (fnc) = (type)DynaGetFunction(#fnc); \
 106           if ((fnc) == NULL) \
 107              return CURLE_FUNCTION_NOT_FOUND; \
 108         } while (0)
 109
 110 /*! CygWin etc. configure could set these, but we don't want it.
 111  * Must use WLdap32.dll code.
 112  */
 113 #if defined(WIN32)
 114 #undef HAVE_DLOPEN
 115 #undef HAVE_LIBDL
 116 #endif
 117
 118 /*
 119  * We use this ZERO_NULL to avoid picky compiler warnings,
 120  * when assigning a NULL pointer to a function pointer var.
 121  */
 122
 123 #define ZERO_NULL 0
 124
 125 typedef void * (*dynafunc)(void *input);
 126
 127 /***********************************************************************
 128  */
 129 #if defined(HAVE_DLOPEN) || defined(HAVE_LIBDL) || defined(WIN32)
 130 static void *libldap = NULL;
 131 #if defined(DL_LBER_FILE)
 132 static void *liblber = NULL;
 133 #endif
 134 #endif
 135
 136 struct bv {
 137   unsigned long bv_len;
 138   char  *bv_val;
 139 };
 140
 141 static int DynaOpen(const char **mod_name)
 142 {
 143 #if defined(HAVE_DLOPEN) || defined(HAVE_LIBDL)
 144   if (libldap == NULL) {
 145     /*
 146      * libldap.so can normally resolve its dependency on liblber.so
 147      * automatically, but in broken installation it does not so
 148      * handle it here by opening liblber.so as global.
 149      */
 150 #ifdef DL_LBER_FILE
 151     *mod_name = DL_LBER_FILE;
 152     liblber = dlopen(*mod_name, DLOPEN_MODE);
 153     if (!liblber)
 154       return 0;
 155 #endif
 156
 157     /* Assume loading libldap.so will fail if loading of liblber.so failed
 158      */
 159     *mod_name = DL_LDAP_FILE;
 160     libldap = dlopen(*mod_name, RTLD_LAZY);
 161   }
 162   return (libldap != NULL);
 163
 164 #elif defined(WIN32)
 165   *mod_name = DL_LDAP_FILE;
 166   if (!libldap)
 167     libldap = (void*)LoadLibrary(*mod_name);
 168   return (libldap != NULL);
 169
 170 #else
 171   *mod_name = "";
 172   return (0);
 173 #endif
 174 }
 175
 176 static void DynaClose(void)
 177 {
 178 #if defined(HAVE_DLOPEN) || defined(HAVE_LIBDL)
 179   if (libldap) {
 180     dlclose(libldap);
 181     libldap=NULL;
 182   }
 183 #ifdef DL_LBER_FILE
 184   if (liblber) {
 185     dlclose(liblber);
 186     liblber=NULL;
 187   }
 188 #endif
 189 #elif defined(WIN32)
 190   if (libldap) {
 191     FreeLibrary ((HMODULE)libldap);
 192     libldap = NULL;
 193   }
 194 #endif
 195 }
 196
 197 static dynafunc DynaGetFunction(const char *name)
 198 {
 199   dynafunc func = (dynafunc)ZERO_NULL;
 200
 201 #if defined(HAVE_DLOPEN) || defined(HAVE_LIBDL)
 202   if (libldap) {
 203     /* This typecast magic below was brought by Joe Halpin. In ISO C, you
 204      * cannot typecast a data pointer to a function pointer, but that's
 205      * exactly what we need to do here to avoid compiler warnings on picky
 206      * compilers! */
 207     *(void**) (&func) = dlsym(libldap, name);
 208   }
 209 #elif defined(WIN32)
 210   if (libldap) {
 211     func = (dynafunc)GetProcAddress((HINSTANCE)libldap, name);
 212   }
 213 #else
 214   (void) name;
 215 #endif
 216   return func;
 217 }
 218
 219 /***********************************************************************
 220  */
 221 typedef struct ldap_url_desc {
 222     struct ldap_url_desc *lud_next;
 223     char   *lud_scheme;
 224     char   *lud_host;
 225     int     lud_port;
 226     char   *lud_dn;
 227     char  **lud_attrs;
 228     int     lud_scope;
 229     char   *lud_filter;
 230     char  **lud_exts;
 231     int     lud_crit_exts;
 232 } LDAPURLDesc;
 233
 234 #ifdef WIN32
 235 static int  _ldap_url_parse (const struct connectdata *conn,
 236                              LDAPURLDesc **ludp);
 237 static void _ldap_free_urldesc (LDAPURLDesc *ludp);
 238
 239 static void (*ldap_free_urldesc)(LDAPURLDesc *) = _ldap_free_urldesc;
 240 #endif
 241
 242 #ifdef DEBUG_LDAP
 243   #define LDAP_TRACE(x)   do { \
 244                             _ldap_trace ("%u: ", __LINE__); \
 245                             _ldap_trace x; \
 246                           } while (0)
 247
 248   static void _ldap_trace (const char *fmt, ...);
 249 #else
 250   #define LDAP_TRACE(x)   ((void)0)
 251 #endif
 252
 253
 254 CURLcode Curl_ldap(struct connectdata *conn, bool *done)
 255 {
 256   CURLcode status = CURLE_OK;
 257   int rc = 0;
 258 #ifndef WIN32
 259   int    (*ldap_url_parse)(char *, LDAPURLDesc **);
 260   void   (*ldap_free_urldesc)(void *);
 261 #endif
 262   void  *(__cdecl *ldap_init)(char *, int);
 263   int    (__cdecl *ldap_simple_bind_s)(void *, char *, char *);
 264   int    (__cdecl *ldap_unbind_s)(void *);
 265   int    (__cdecl *ldap_search_s)(void *, char *, int, char *, char **,
 266                                   int, void **);
 267   void  *(__cdecl *ldap_first_entry)(void *, void *);
 268   void  *(__cdecl *ldap_next_entry)(void *, void *);
 269   char  *(__cdecl *ldap_err2string)(int);
 270   char  *(__cdecl *ldap_get_dn)(void *, void *);
 271   char  *(__cdecl *ldap_first_attribute)(void *, void *, void **);
 272   char  *(__cdecl *ldap_next_attribute)(void *, void *, void *);
 273   void **(__cdecl *ldap_get_values_len)(void *, void *, const char *);
 274   void   (__cdecl *ldap_value_free_len)(void **);
 275   void   (__cdecl *ldap_memfree)(void *);
 276   void   (__cdecl *ber_free)(void *, int);
 277   int    (__cdecl *ldap_set_option)(void *, int, void *);
 278
 279   void *server;
 280   LDAPURLDesc *ludp = NULL;
 281   const char *mod_name;
 282   void *result;
 283   void *entryIterator;     /*! type should be 'LDAPMessage *' */
 284   int num = 0;
 285   struct SessionHandle *data=conn->data;
 286   int ldap_proto;
 287   char *val_b64;
 288   size_t val_b64_sz;
 289
 290   *done = TRUE; /* unconditionally */
 291   infof(data, "LDAP local: %s\n", data->change.url);
 292
 293   if (!DynaOpen(&mod_name)) {
 294     failf(data, "The %s LDAP library/libraries couldn't be opened", mod_name);
 295     return CURLE_LIBRARY_NOT_FOUND;
 296   }
 297
 298   /* The types are needed because ANSI C distinguishes between
 299    * pointer-to-object (data) and pointer-to-function.
 300    */
 301   DYNA_GET_FUNCTION(void *(__cdecl *)(char *, int), ldap_init);
 302   DYNA_GET_FUNCTION(int (__cdecl *)(void *, char *, char *),
 303                     ldap_simple_bind_s);
 304   DYNA_GET_FUNCTION(int (__cdecl *)(void *), ldap_unbind_s);
 305 #ifndef WIN32
 306   DYNA_GET_FUNCTION(int (*)(char *, LDAPURLDesc **), ldap_url_parse);
 307   DYNA_GET_FUNCTION(void (*)(void *), ldap_free_urldesc);
 308 #endif
 309   DYNA_GET_FUNCTION(int (__cdecl *)(void *, char *, int, char *, char **, int,
 310                                     void **), ldap_search_s);
 311   DYNA_GET_FUNCTION(void *(__cdecl *)(void *, void *), ldap_first_entry);
 312   DYNA_GET_FUNCTION(void *(__cdecl *)(void *, void *), ldap_next_entry);
 313   DYNA_GET_FUNCTION(char *(__cdecl *)(int), ldap_err2string);
 314   DYNA_GET_FUNCTION(char *(__cdecl *)(void *, void *), ldap_get_dn);
 315   DYNA_GET_FUNCTION(char *(__cdecl *)(void *, void *, void **),
 316                     ldap_first_attribute);
 317   DYNA_GET_FUNCTION(char *(__cdecl *)(void *, void *, void *),
 318                     ldap_next_attribute);
 319   DYNA_GET_FUNCTION(void **(__cdecl *)(void *, void *, const char *),
 320                     ldap_get_values_len);
 321   DYNA_GET_FUNCTION(void (__cdecl *)(void **), ldap_value_free_len);
 322   DYNA_GET_FUNCTION(void (__cdecl *)(void *), ldap_memfree);
 323   DYNA_GET_FUNCTION(void (__cdecl *)(void *, int), ber_free);
 324   DYNA_GET_FUNCTION(int (__cdecl *)(void *, int, void *), ldap_set_option);
 325
 326   server = (*ldap_init)(conn->host.name, (int)conn->port);
 327   if (server == NULL) {
 328     failf(data, "LDAP local: Cannot connect to %s:%d",
 329           conn->host.name, conn->port);
 330     status = CURLE_COULDNT_CONNECT;
 331     goto quit;
 332   }
 333
 334   ldap_proto = LDAP_VERSION3;
 335   (*ldap_set_option)(server, LDAP_OPT_PROTOCOL_VERSION, &ldap_proto);
 336   rc = (*ldap_simple_bind_s)(server,
 337                              conn->bits.user_passwd ? conn->user : NULL,
 338                              conn->bits.user_passwd ? conn->passwd : NULL);
 339   if (rc != 0) {
 340     ldap_proto = LDAP_VERSION2;
 341     (*ldap_set_option)(server, LDAP_OPT_PROTOCOL_VERSION, &ldap_proto);
 342     rc = (*ldap_simple_bind_s)(server,
 343                                conn->bits.user_passwd ? conn->user : NULL,
 344                                conn->bits.user_passwd ? conn->passwd : NULL);
 345   }
 346   if (rc != 0) {
 347      failf(data, "LDAP local: %s", (*ldap_err2string)(rc));
 348      status = CURLE_LDAP_CANNOT_BIND;
 349      goto quit;
 350   }
 351
 352 #ifdef WIN32
 353   rc = _ldap_url_parse(conn, &ludp);
 354 #else
 355   rc = (*ldap_url_parse)(data->change.url, &ludp);
 356 #endif
 357
 358   if (rc != 0) {
 359      failf(data, "LDAP local: %s", (*ldap_err2string)(rc));
 360      status = CURLE_LDAP_INVALID_URL;
 361      goto quit;
 362   }
 363
 364   rc = (*ldap_search_s)(server, ludp->lud_dn, ludp->lud_scope,
 365                         ludp->lud_filter, ludp->lud_attrs, 0, &result);
 366
 367   if (rc != 0 && rc != LDAP_SIZELIMIT_EXCEEDED) {
 368     failf(data, "LDAP remote: %s", (*ldap_err2string)(rc));
 369     status = CURLE_LDAP_SEARCH_FAILED;
 370     goto quit;
 371   }
 372
 373   for(num = 0, entryIterator = (*ldap_first_entry)(server, result);
 374       entryIterator;
 375       entryIterator = (*ldap_next_entry)(server, entryIterator), num++)
 376   {
 377     void  *ber = NULL;      /*! is really 'BerElement **' */
 378     void  *attribute;       /*! suspicious that this isn't 'const' */
 379     char  *dn = (*ldap_get_dn)(server, entryIterator);
 380     int i;
 381
 382     Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"DN: ", 4);
 383     Curl_client_write(conn, CLIENTWRITE_BODY, (char *)dn, 0);
 384     Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\n", 1);
 385
 386     for (attribute = (*ldap_first_attribute)(server, entryIterator, &ber);
 387          attribute;
 388          attribute = (*ldap_next_attribute)(server, entryIterator, ber))
 389     {
 390       struct bv **vals = (struct bv **)
 391         (*ldap_get_values_len)(server, entryIterator, attribute);
 392
 393       if (vals != NULL)
 394       {
 395         for (i = 0; (vals[i] != NULL); i++)
 396         {
 397           Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\t", 1);
 398           Curl_client_write(conn, CLIENTWRITE_BODY, (char *) attribute, 0);
 399           Curl_client_write(conn, CLIENTWRITE_BODY, (char *)": ", 2);
 400           if ((strlen(attribute) > 7) &&
 401               (strcmp(";binary",
 402                       (char *)attribute +
 403                       (strlen((char *)attribute) - 7)) == 0)) {
 404             /* Binary attribute, encode to base64. */
 405             val_b64_sz = Curl_base64_encode(conn->data,
 406                                             vals[i]->bv_val,
 407                                             vals[i]->bv_len,
 408                                             &val_b64);
 409             if (val_b64_sz > 0) {
 410               Curl_client_write(conn, CLIENTWRITE_BODY, val_b64, val_b64_sz);
 411               free(val_b64);
 412             }
 413           } else
 414             Curl_client_write(conn, CLIENTWRITE_BODY, vals[i]->bv_val,
 415                               vals[i]->bv_len);
 416           Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\n", 0);
 417         }
 418
 419         /* Free memory used to store values */
 420         (*ldap_value_free_len)((void **)vals);
 421       }
 422       Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\n", 1);
 423
 424       (*ldap_memfree)(attribute);
 425     }
 426     (*ldap_memfree)(dn);
 427     if (ber)
 428        (*ber_free)(ber, 0);
 429   }
 430
 431 quit:
 432   LDAP_TRACE (("Received %d entries\n", num));
 433   if (rc == LDAP_SIZELIMIT_EXCEEDED)
 434      infof(data, "There are more than %d entries\n", num);
 435   if (ludp)
 436      (*ldap_free_urldesc)(ludp);
 437   if (server)
 438      (*ldap_unbind_s)(server);
 439
 440   DynaClose();
 441
 442   /* no data to transfer */
 443   Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
 444   conn->bits.close = TRUE;
 445
 446   return status;
 447 }
 448
 449 #ifdef DEBUG_LDAP
 450 static void _ldap_trace (const char *fmt, ...)
 451 {
 452   static int do_trace = -1;
 453   va_list args;
 454
 455   if (do_trace == -1) {
 456     const char *env = getenv("CURL_TRACE");
 457     do_trace = (env && atoi(env) > 0);
 458   }
 459   if (!do_trace)
 460     return;
 461
 462   va_start (args, fmt);
 463   vfprintf (stderr, fmt, args);
 464   va_end (args);
 465 }
 466 #endif
 467
 468 #ifdef WIN32
 469 /*
 470  * Return scope-value for a scope-string.
 471  */
 472 static int str2scope (const char *p)
 473 {
 474   if (!stricmp(p, "one"))
 475      return LDAP_SCOPE_ONELEVEL;
 476   if (!stricmp(p, "onetree"))
 477      return LDAP_SCOPE_ONELEVEL;
 478   if (!stricmp(p, "base"))
 479      return LDAP_SCOPE_BASE;
 480   if (!stricmp(p, "sub"))
 481      return LDAP_SCOPE_SUBTREE;
 482   if (!stricmp( p, "subtree"))
 483      return LDAP_SCOPE_SUBTREE;
 484   return (-1);
 485 }
 486
 487 /*
 488  * Split 'str' into strings separated by commas.
 489  * Note: res[] points into 'str'.
 490  */
 491 static char **split_str (char *str)
 492 {
 493   char **res, *lasts, *s;
 494   int  i;
 495
 496   for (i = 2, s = strchr(str,','); s; i++)
 497      s = strchr(++s,',');
 498
 499   res = calloc(i, sizeof(char*));
 500   if (!res)
 501     return NULL;
 502
 503   for (i = 0, s = strtok_r(str, ",", &lasts); s;
 504        s = strtok_r(NULL, ",", &lasts), i++)
 505     res[i] = s;
 506   return res;
 507 }
 508
 509 /*
 510  * Unescape the LDAP-URL components
 511  */
 512 static bool unescape_elements (void *data, LDAPURLDesc *ludp)
 513 {
 514   int i;
 515
 516   if (ludp->lud_filter) {
 517     ludp->lud_filter = curl_easy_unescape(data, ludp->lud_filter, 0, NULL);
 518     if (!ludp->lud_filter)
 519        return (FALSE);
 520   }
 521
 522   for (i = 0; ludp->lud_attrs && ludp->lud_attrs[i]; i++) {
 523     ludp->lud_attrs[i] = curl_easy_unescape(data, ludp->lud_attrs[i], 0, NULL);
 524     if (!ludp->lud_attrs[i])
 525        return (FALSE);
 526   }
 527
 528   for (i = 0; ludp->lud_exts && ludp->lud_exts[i]; i++) {
 529     ludp->lud_exts[i] = curl_easy_unescape(data, ludp->lud_exts[i], 0, NULL);
 530     if (!ludp->lud_exts[i])
 531        return (FALSE);
 532   }
 533
 534   if (ludp->lud_dn) {
 535     char *dn = ludp->lud_dn;
 536     char *new_dn = curl_easy_unescape(data, dn, 0, NULL);
 537
 538     free(dn);
 539     ludp->lud_dn = new_dn;
 540     if (!new_dn)
 541        return (FALSE);
 542   }
 543   return (TRUE);
 544 }
 545
 546 /*
 547  * Break apart the pieces of an LDAP URL.
 548  * Syntax:
 549  *   ldap://<hostname>:<port>/<base_dn>?<attributes>?<scope>?<filter>?<ext>
 550  *
 551  * <hostname> already known from 'conn->host.name'.
 552  * <port>     already known from 'conn->remote_port'.
 553  * extract the rest from 'conn->data->reqdata.path+1'. All fields are optional.
 554  * e.g.
 555  *   ldap://<hostname>:<port>/?<attributes>?<scope>?<filter>
 556  * yields ludp->lud_dn = "".
 557  *
 558  * Ref. http://developer.netscape.com/docs/manuals/dirsdk/csdk30/url.htm#2831915
 559  */
 560 static int _ldap_url_parse2 (const struct connectdata *conn, LDAPURLDesc *ludp)
 561 {
 562   char *p, *q;
 563   int i;
 564
 565   if (!conn->data ||
 566       !conn->data->reqdata.path ||
 567        conn->data->reqdata.path[0] != '/' ||
 568       !checkprefix(conn->protostr, conn->data->change.url))
 569      return LDAP_INVALID_SYNTAX;
 570
 571   ludp->lud_scope = LDAP_SCOPE_BASE;
 572   ludp->lud_port  = conn->remote_port;
 573   ludp->lud_host  = conn->host.name;
 574
 575   /* parse DN (Distinguished Name).
 576    */
 577   ludp->lud_dn = strdup(conn->data->reqdata.path+1);
 578   if (!ludp->lud_dn)
 579      return LDAP_NO_MEMORY;
 580
 581   p = strchr(ludp->lud_dn, '?');
 582   LDAP_TRACE (("DN '%.*s'\n", p ? (size_t)(p-ludp->lud_dn) :
 583                strlen(ludp->lud_dn), ludp->lud_dn));
 584
 585   if (!p)
 586      goto success;
 587
 588   *p++ = '\0';
 589
 590   /* parse attributes. skip "??".
 591    */
 592   q = strchr(p, '?');
 593   if (q)
 594      *q++ = '\0';
 595
 596   if (*p && *p != '?') {
 597     ludp->lud_attrs = split_str(p);
 598     if (!ludp->lud_attrs)
 599        return LDAP_NO_MEMORY;
 600
 601     for (i = 0; ludp->lud_attrs[i]; i++)
 602         LDAP_TRACE (("attr[%d] '%s'\n", i, ludp->lud_attrs[i]));
 603   }
 604
 605   p = q;
 606   if (!p)
 607      goto success;
 608
 609   /* parse scope. skip "??"
 610    */
 611   q = strchr(p, '?');
 612   if (q)
 613      *q++ = '\0';
 614
 615   if (*p && *p != '?') {
 616     ludp->lud_scope = str2scope(p);
 617     if (ludp->lud_scope == -1)
 618        return LDAP_INVALID_SYNTAX;
 619     LDAP_TRACE (("scope %d\n", ludp->lud_scope));
 620   }
 621
 622   p = q;
 623   if (!p)
 624      goto success;
 625
 626   /* parse filter
 627    */
 628   q = strchr(p, '?');
 629   if (q)
 630      *q++ = '\0';
 631   if (!*p)
 632      return LDAP_INVALID_SYNTAX;
 633
 634   ludp->lud_filter = p;
 635   LDAP_TRACE (("filter '%s'\n", ludp->lud_filter));
 636
 637   p = q;
 638   if (!p)
 639      goto success;
 640
 641   /* parse extensions
 642    */
 643   ludp->lud_exts = split_str(p);
 644   if (!ludp->lud_exts)
 645      return LDAP_NO_MEMORY;
 646
 647   for (i = 0; ludp->lud_exts[i]; i++)
 648       LDAP_TRACE (("exts[%d] '%s'\n", i, ludp->lud_exts[i]));
 649
 650 success:
 651   if (!unescape_elements(conn->data, ludp))
 652      return LDAP_NO_MEMORY;
 653   return LDAP_SUCCESS;
 654 }
 655
 656 static int _ldap_url_parse (const struct connectdata *conn,
 657                             LDAPURLDesc **ludpp)
 658 {
 659   LDAPURLDesc *ludp = calloc(sizeof(*ludp), 1);
 660   int rc;
 661
 662   *ludpp = NULL;
 663   if (!ludp)
 664      return LDAP_NO_MEMORY;
 665
 666   rc = _ldap_url_parse2 (conn, ludp);
 667   if (rc != LDAP_SUCCESS) {
 668     _ldap_free_urldesc(ludp);
 669     ludp = NULL;
 670   }
 671   *ludpp = ludp;
 672   return (rc);
 673 }
 674
 675 static void _ldap_free_urldesc (LDAPURLDesc *ludp)
 676 {
 677   int i;
 678
 679   if (!ludp)
 680      return;
 681
 682   if (ludp->lud_dn)
 683      free(ludp->lud_dn);
 684
 685   if (ludp->lud_filter)
 686      free(ludp->lud_filter);
 687
 688   if (ludp->lud_attrs) {
 689     for (i = 0; ludp->lud_attrs[i]; i++)
 690        free(ludp->lud_attrs[i]);
 691     free(ludp->lud_attrs);
 692   }
 693
 694   if (ludp->lud_exts) {
 695     for (i = 0; ludp->lud_exts[i]; i++)
 696        free(ludp->lud_exts[i]);
 697     free(ludp->lud_exts);
 698   }
 699   free (ludp);
 700 }
 701 #endif  /* WIN32 */
 702 #endif  /* CURL_DISABLE_LDAP */