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curl/lib/ldap.c
Yang Tse fd00b382b2 base64: fix Curl_base64_encode and Curl_base64_decode interfaces 
Previous interfaces for these libcurl internal functions did not allow to tell
apart a legitimate zero size result from an error condition. These functions
now return a CURLcode indicating function success or otherwise specific error.
Output size is returned using a pointer argument.

All usage of these two functions, and others closely related, has been adapted
to the new interfaces. Relative error and OOM handling adapted or added where
missing. Unit test 1302 also adapted.
2011-08-24 08:10:30 +02:00

728 lines
21 KiB
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "setup.h"
#if !defined(CURL_DISABLE_LDAP) && !defined(USE_OPENLDAP)
/*
* Notice that USE_OPENLDAP is only a source code selection switch. When
* libcurl is built with USE_OPENLDAP defined the libcurl source code that
* gets compiled is the code from openldap.c, otherwise the code that gets
* compiled is the code from ldap.c.
*
* When USE_OPENLDAP is defined a recent version of the OpenLDAP library
* might be required for compilation and runtime. In order to use ancient
* OpenLDAP library versions, USE_OPENLDAP shall not be defined.
*/
#ifdef CURL_LDAP_WIN /* Use Windows LDAP implementation. */
# include <winldap.h>
# ifndef LDAP_VENDOR_NAME
# error Your Platform SDK is NOT sufficient for LDAP support! \
Update your Platform SDK, or disable LDAP support!
# else
# include <winber.h>
# endif
#else
# define LDAP_DEPRECATED 1 /* Be sure ldap_init() is defined. */
# ifdef HAVE_LBER_H
# include <lber.h>
# endif
# include <ldap.h>
# if (defined(HAVE_LDAP_SSL) && defined(HAVE_LDAP_SSL_H))
# include <ldap_ssl.h>
# endif /* HAVE_LDAP_SSL && HAVE_LDAP_SSL_H */
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "urldata.h"
#include <curl/curl.h>
#include "sendf.h"
#include "escape.h"
#include "progress.h"
#include "transfer.h"
#include "strequal.h"
#include "strtok.h"
#include "curl_ldap.h"
#include "curl_memory.h"
#include "curl_base64.h"
#include "rawstr.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#include "memdebug.h"
#ifndef HAVE_LDAP_URL_PARSE
/* Use our own implementation. */
typedef struct {
char *lud_host;
int lud_port;
char *lud_dn;
char **lud_attrs;
int lud_scope;
char *lud_filter;
char **lud_exts;
} CURL_LDAPURLDesc;
#undef LDAPURLDesc
#define LDAPURLDesc CURL_LDAPURLDesc
static int _ldap_url_parse (const struct connectdata *conn,
LDAPURLDesc **ludp);
static void _ldap_free_urldesc (LDAPURLDesc *ludp);
#undef ldap_free_urldesc
#define ldap_free_urldesc _ldap_free_urldesc
#endif
#ifdef DEBUG_LDAP
#define LDAP_TRACE(x) do { \
_ldap_trace ("%u: ", __LINE__); \
_ldap_trace x; \
} while(0)
static void _ldap_trace (const char *fmt, ...);
#else
#define LDAP_TRACE(x) ((void)0)
#endif
static CURLcode Curl_ldap(struct connectdata *conn, bool *done);
/*
* LDAP protocol handler.
*/
const struct Curl_handler Curl_handler_ldap = {
"LDAP", /* scheme */
ZERO_NULL, /* setup_connection */
Curl_ldap, /* do_it */
ZERO_NULL, /* done */
ZERO_NULL, /* do_more */
ZERO_NULL, /* connect_it */
ZERO_NULL, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
PORT_LDAP, /* defport */
CURLPROTO_LDAP, /* protocol */
PROTOPT_NONE /* flags */
};
#ifdef HAVE_LDAP_SSL
/*
* LDAPS protocol handler.
*/
const struct Curl_handler Curl_handler_ldaps = {
"LDAPS", /* scheme */
ZERO_NULL, /* setup_connection */
Curl_ldap, /* do_it */
ZERO_NULL, /* done */
ZERO_NULL, /* do_more */
ZERO_NULL, /* connect_it */
ZERO_NULL, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
PORT_LDAPS, /* defport */
CURLPROTO_LDAP | CURLPROTO_LDAPS, /* protocol */
PROTOPT_SSL /* flags */
};
#endif
static CURLcode Curl_ldap(struct connectdata *conn, bool *done)
{
CURLcode status = CURLE_OK;
int rc = 0;
LDAP *server = NULL;
LDAPURLDesc *ludp = NULL;
LDAPMessage *result = NULL;
LDAPMessage *entryIterator;
int num = 0;
struct SessionHandle *data=conn->data;
int ldap_proto = LDAP_VERSION3;
int ldap_ssl = 0;
char *val_b64 = NULL;
size_t val_b64_sz = 0;
curl_off_t dlsize = 0;
#ifdef LDAP_OPT_NETWORK_TIMEOUT
struct timeval ldap_timeout = {10,0}; /* 10 sec connection/search timeout */
#endif
*done = TRUE; /* unconditionally */
infof(data, "LDAP local: LDAP Vendor = %s ; LDAP Version = %d\n",
LDAP_VENDOR_NAME, LDAP_VENDOR_VERSION);
infof(data, "LDAP local: %s\n", data->change.url);
#ifdef HAVE_LDAP_URL_PARSE
rc = ldap_url_parse(data->change.url, &ludp);
#else
rc = _ldap_url_parse(conn, &ludp);
#endif
if(rc != 0) {
failf(data, "LDAP local: %s", ldap_err2string(rc));
status = CURLE_LDAP_INVALID_URL;
goto quit;
}
/* Get the URL scheme ( either ldap or ldaps ) */
if(conn->given->flags & PROTOPT_SSL)
ldap_ssl = 1;
infof(data, "LDAP local: trying to establish %s connection\n",
ldap_ssl ? "encrypted" : "cleartext");
#ifdef LDAP_OPT_NETWORK_TIMEOUT
ldap_set_option(NULL, LDAP_OPT_NETWORK_TIMEOUT, &ldap_timeout);
#endif
ldap_set_option(NULL, LDAP_OPT_PROTOCOL_VERSION, &ldap_proto);
if(ldap_ssl) {
#ifdef HAVE_LDAP_SSL
#ifdef CURL_LDAP_WIN
/* Win32 LDAP SDK doesn't support insecure mode without CA! */
server = ldap_sslinit(conn->host.name, (int)conn->port, 1);
ldap_set_option(server, LDAP_OPT_SSL, LDAP_OPT_ON);
#else
int ldap_option;
char* ldap_ca = data->set.str[STRING_SSL_CAFILE];
#if defined(CURL_HAS_NOVELL_LDAPSDK)
rc = ldapssl_client_init(NULL, NULL);
if(rc != LDAP_SUCCESS) {
failf(data, "LDAP local: ldapssl_client_init %s", ldap_err2string(rc));
status = CURLE_SSL_CERTPROBLEM;
goto quit;
}
if(data->set.ssl.verifypeer) {
/* Novell SDK supports DER or BASE64 files. */
int cert_type = LDAPSSL_CERT_FILETYPE_B64;
if((data->set.str[STRING_CERT_TYPE]) &&
(Curl_raw_equal(data->set.str[STRING_CERT_TYPE], "DER")))
cert_type = LDAPSSL_CERT_FILETYPE_DER;
if(!ldap_ca) {
failf(data, "LDAP local: ERROR %s CA cert not set!",
(cert_type == LDAPSSL_CERT_FILETYPE_DER ? "DER" : "PEM"));
status = CURLE_SSL_CERTPROBLEM;
goto quit;
}
infof(data, "LDAP local: using %s CA cert '%s'\n",
(cert_type == LDAPSSL_CERT_FILETYPE_DER ? "DER" : "PEM"),
ldap_ca);
rc = ldapssl_add_trusted_cert(ldap_ca, cert_type);
if(rc != LDAP_SUCCESS) {
failf(data, "LDAP local: ERROR setting %s CA cert: %s",
(cert_type == LDAPSSL_CERT_FILETYPE_DER ? "DER" : "PEM"),
ldap_err2string(rc));
status = CURLE_SSL_CERTPROBLEM;
goto quit;
}
ldap_option = LDAPSSL_VERIFY_SERVER;
}
else
ldap_option = LDAPSSL_VERIFY_NONE;
rc = ldapssl_set_verify_mode(ldap_option);
if(rc != LDAP_SUCCESS) {
failf(data, "LDAP local: ERROR setting cert verify mode: %s",
ldap_err2string(rc));
status = CURLE_SSL_CERTPROBLEM;
goto quit;
}
server = ldapssl_init(conn->host.name, (int)conn->port, 1);
if(server == NULL) {
failf(data, "LDAP local: Cannot connect to %s:%hu",
conn->host.name, conn->port);
status = CURLE_COULDNT_CONNECT;
goto quit;
}
#elif defined(LDAP_OPT_X_TLS)
if(data->set.ssl.verifypeer) {
/* OpenLDAP SDK supports BASE64 files. */
if((data->set.str[STRING_CERT_TYPE]) &&
(!Curl_raw_equal(data->set.str[STRING_CERT_TYPE], "PEM"))) {
failf(data, "LDAP local: ERROR OpenLDAP only supports PEM cert-type!");
status = CURLE_SSL_CERTPROBLEM;
goto quit;
}
if(!ldap_ca) {
failf(data, "LDAP local: ERROR PEM CA cert not set!");
status = CURLE_SSL_CERTPROBLEM;
goto quit;
}
infof(data, "LDAP local: using PEM CA cert: %s\n", ldap_ca);
rc = ldap_set_option(NULL, LDAP_OPT_X_TLS_CACERTFILE, ldap_ca);
if(rc != LDAP_SUCCESS) {
failf(data, "LDAP local: ERROR setting PEM CA cert: %s",
ldap_err2string(rc));
status = CURLE_SSL_CERTPROBLEM;
goto quit;
}
ldap_option = LDAP_OPT_X_TLS_DEMAND;
}
else
ldap_option = LDAP_OPT_X_TLS_NEVER;
rc = ldap_set_option(NULL, LDAP_OPT_X_TLS_REQUIRE_CERT, &ldap_option);
if(rc != LDAP_SUCCESS) {
failf(data, "LDAP local: ERROR setting cert verify mode: %s",
ldap_err2string(rc));
status = CURLE_SSL_CERTPROBLEM;
goto quit;
}
server = ldap_init(conn->host.name, (int)conn->port);
if(server == NULL) {
failf(data, "LDAP local: Cannot connect to %s:%hu",
conn->host.name, conn->port);
status = CURLE_COULDNT_CONNECT;
goto quit;
}
ldap_option = LDAP_OPT_X_TLS_HARD;
rc = ldap_set_option(server, LDAP_OPT_X_TLS, &ldap_option);
if(rc != LDAP_SUCCESS) {
failf(data, "LDAP local: ERROR setting SSL/TLS mode: %s",
ldap_err2string(rc));
status = CURLE_SSL_CERTPROBLEM;
goto quit;
}
/*
rc = ldap_start_tls_s(server, NULL, NULL);
if(rc != LDAP_SUCCESS) {
failf(data, "LDAP local: ERROR starting SSL/TLS mode: %s",
ldap_err2string(rc));
status = CURLE_SSL_CERTPROBLEM;
goto quit;
}
*/
#else
/* we should probably never come up to here since configure
should check in first place if we can support LDAP SSL/TLS */
failf(data, "LDAP local: SSL/TLS not supported with this version "
"of the OpenLDAP toolkit\n");
status = CURLE_SSL_CERTPROBLEM;
goto quit;
#endif
#endif
#endif /* CURL_LDAP_USE_SSL */
}
else {
server = ldap_init(conn->host.name, (int)conn->port);
if(server == NULL) {
failf(data, "LDAP local: Cannot connect to %s:%hu",
conn->host.name, conn->port);
status = CURLE_COULDNT_CONNECT;
goto quit;
}
}
#ifdef CURL_LDAP_WIN
ldap_set_option(server, LDAP_OPT_PROTOCOL_VERSION, &ldap_proto);
#endif
rc = ldap_simple_bind_s(server,
conn->bits.user_passwd ? conn->user : NULL,
conn->bits.user_passwd ? conn->passwd : NULL);
if(!ldap_ssl && rc != 0) {
ldap_proto = LDAP_VERSION2;
ldap_set_option(server, LDAP_OPT_PROTOCOL_VERSION, &ldap_proto);
rc = ldap_simple_bind_s(server,
conn->bits.user_passwd ? conn->user : NULL,
conn->bits.user_passwd ? conn->passwd : NULL);
}
if(rc != 0) {
failf(data, "LDAP local: ldap_simple_bind_s %s", ldap_err2string(rc));
status = CURLE_LDAP_CANNOT_BIND;
goto quit;
}
rc = ldap_search_s(server, ludp->lud_dn, ludp->lud_scope,
ludp->lud_filter, ludp->lud_attrs, 0, &result);
if(rc != 0 && rc != LDAP_SIZELIMIT_EXCEEDED) {
failf(data, "LDAP remote: %s", ldap_err2string(rc));
status = CURLE_LDAP_SEARCH_FAILED;
goto quit;
}
for(num = 0, entryIterator = ldap_first_entry(server, result);
entryIterator;
entryIterator = ldap_next_entry(server, entryIterator), num++) {
BerElement *ber = NULL;
char *attribute; /*! suspicious that this isn't 'const' */
char *dn = ldap_get_dn(server, entryIterator);
int i;
Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"DN: ", 4);
Curl_client_write(conn, CLIENTWRITE_BODY, (char *)dn, 0);
Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\n", 1);
dlsize += strlen(dn)+5;
for(attribute = ldap_first_attribute(server, entryIterator, &ber);
attribute;
attribute = ldap_next_attribute(server, entryIterator, ber)) {
BerValue **vals = ldap_get_values_len(server, entryIterator, attribute);
if(vals != NULL) {
for(i = 0; (vals[i] != NULL); i++) {
Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\t", 1);
Curl_client_write(conn, CLIENTWRITE_BODY, (char *) attribute, 0);
Curl_client_write(conn, CLIENTWRITE_BODY, (char *)": ", 2);
dlsize += strlen(attribute)+3;
if((strlen(attribute) > 7) &&
(strcmp(";binary",
(char *)attribute +
(strlen((char *)attribute) - 7)) == 0)) {
/* Binary attribute, encode to base64. */
CURLcode error = Curl_base64_encode(data,
vals[i]->bv_val,
vals[i]->bv_len,
&val_b64,
&val_b64_sz);
if(error) {
ldap_value_free_len(vals);
ldap_memfree(attribute);
ldap_memfree(dn);
if(ber)
ber_free(ber, 0);
status = error;
goto quit;
}
if(val_b64_sz > 0) {
Curl_client_write(conn, CLIENTWRITE_BODY, val_b64, val_b64_sz);
free(val_b64);
dlsize += val_b64_sz;
}
}
else {
Curl_client_write(conn, CLIENTWRITE_BODY, vals[i]->bv_val,
vals[i]->bv_len);
dlsize += vals[i]->bv_len;
}
Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\n", 0);
dlsize++;
}
/* Free memory used to store values */
ldap_value_free_len(vals);
}
Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"\n", 1);
dlsize++;
Curl_pgrsSetDownloadCounter(data, dlsize);
ldap_memfree(attribute);
}
ldap_memfree(dn);
if(ber)
ber_free(ber, 0);
}
quit:
if(result) {
ldap_msgfree(result);
LDAP_TRACE (("Received %d entries\n", num));
}
if(rc == LDAP_SIZELIMIT_EXCEEDED)
infof(data, "There are more than %d entries\n", num);
if(ludp)
ldap_free_urldesc(ludp);
if(server)
ldap_unbind_s(server);
#if defined(HAVE_LDAP_SSL) && defined(CURL_HAS_NOVELL_LDAPSDK)
if(ldap_ssl)
ldapssl_client_deinit();
#endif /* HAVE_LDAP_SSL && CURL_HAS_NOVELL_LDAPSDK */
/* no data to transfer */
Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
conn->bits.close = TRUE;
return status;
}
#ifdef DEBUG_LDAP
static void _ldap_trace (const char *fmt, ...)
{
static int do_trace = -1;
va_list args;
if(do_trace == -1) {
const char *env = getenv("CURL_TRACE");
do_trace = (env && strtol(env, NULL, 10) > 0);
}
if(!do_trace)
return;
va_start (args, fmt);
vfprintf (stderr, fmt, args);
va_end (args);
}
#endif
#ifndef HAVE_LDAP_URL_PARSE
/*
* Return scope-value for a scope-string.
*/
static int str2scope (const char *p)
{
if(strequal(p, "one"))
return LDAP_SCOPE_ONELEVEL;
if(strequal(p, "onetree"))
return LDAP_SCOPE_ONELEVEL;
if(strequal(p, "base"))
return LDAP_SCOPE_BASE;
if(strequal(p, "sub"))
return LDAP_SCOPE_SUBTREE;
if(strequal( p, "subtree"))
return LDAP_SCOPE_SUBTREE;
return (-1);
}
/*
* Split 'str' into strings separated by commas.
* Note: res[] points into 'str'.
*/
static char **split_str (char *str)
{
char **res, *lasts, *s;
int i;
for(i = 2, s = strchr(str,','); s; i++)
s = strchr(++s,',');
res = calloc(i, sizeof(char*));
if(!res)
return NULL;
for(i = 0, s = strtok_r(str, ",", &lasts); s;
s = strtok_r(NULL, ",", &lasts), i++)
res[i] = s;
return res;
}
/*
* Unescape the LDAP-URL components
*/
static bool unescape_elements (void *data, LDAPURLDesc *ludp)
{
int i;
if(ludp->lud_filter) {
ludp->lud_filter = curl_easy_unescape(data, ludp->lud_filter, 0, NULL);
if(!ludp->lud_filter)
return (FALSE);
}
for(i = 0; ludp->lud_attrs && ludp->lud_attrs[i]; i++) {
ludp->lud_attrs[i] = curl_easy_unescape(data, ludp->lud_attrs[i], 0, NULL);
if(!ludp->lud_attrs[i])
return (FALSE);
}
for(i = 0; ludp->lud_exts && ludp->lud_exts[i]; i++) {
ludp->lud_exts[i] = curl_easy_unescape(data, ludp->lud_exts[i], 0, NULL);
if(!ludp->lud_exts[i])
return (FALSE);
}
if(ludp->lud_dn) {
char *dn = ludp->lud_dn;
char *new_dn = curl_easy_unescape(data, dn, 0, NULL);
free(dn);
ludp->lud_dn = new_dn;
if(!new_dn)
return (FALSE);
}
return (TRUE);
}
/*
* Break apart the pieces of an LDAP URL.
* Syntax:
* ldap://<hostname>:<port>/<base_dn>?<attributes>?<scope>?<filter>?<ext>
*
* <hostname> already known from 'conn->host.name'.
* <port> already known from 'conn->remote_port'.
* extract the rest from 'conn->data->state.path+1'. All fields are optional.
* e.g.
* ldap://<hostname>:<port>/?<attributes>?<scope>?<filter>
* yields ludp->lud_dn = "".
*
* Defined in RFC4516 section 2.
*/
static int _ldap_url_parse2 (const struct connectdata *conn, LDAPURLDesc *ludp)
{
char *p, *q;
int i;
if(!conn->data ||
!conn->data->state.path ||
conn->data->state.path[0] != '/' ||
!checkprefix("LDAP", conn->data->change.url))
return LDAP_INVALID_SYNTAX;
ludp->lud_scope = LDAP_SCOPE_BASE;
ludp->lud_port = conn->remote_port;
ludp->lud_host = conn->host.name;
/* parse DN (Distinguished Name).
*/
ludp->lud_dn = strdup(conn->data->state.path+1);
if(!ludp->lud_dn)
return LDAP_NO_MEMORY;
p = strchr(ludp->lud_dn, '?');
LDAP_TRACE (("DN '%.*s'\n", p ? (size_t)(p-ludp->lud_dn) :
strlen(ludp->lud_dn), ludp->lud_dn));
if(!p)
goto success;
*p++ = '\0';
/* parse attributes. skip "??".
*/
q = strchr(p, '?');
if(q)
*q++ = '\0';
if(*p && *p != '?') {
ludp->lud_attrs = split_str(p);
if(!ludp->lud_attrs)
return LDAP_NO_MEMORY;
for(i = 0; ludp->lud_attrs[i]; i++)
LDAP_TRACE (("attr[%d] '%s'\n", i, ludp->lud_attrs[i]));
}
p = q;
if(!p)
goto success;
/* parse scope. skip "??"
*/
q = strchr(p, '?');
if(q)
*q++ = '\0';
if(*p && *p != '?') {
ludp->lud_scope = str2scope(p);
if(ludp->lud_scope == -1)
return LDAP_INVALID_SYNTAX;
LDAP_TRACE (("scope %d\n", ludp->lud_scope));
}
p = q;
if(!p)
goto success;
/* parse filter
*/
q = strchr(p, '?');
if(q)
*q++ = '\0';
if(!*p)
return LDAP_INVALID_SYNTAX;
ludp->lud_filter = p;
LDAP_TRACE (("filter '%s'\n", ludp->lud_filter));
p = q;
if(!p)
goto success;
/* parse extensions
*/
ludp->lud_exts = split_str(p);
if(!ludp->lud_exts)
return LDAP_NO_MEMORY;
for(i = 0; ludp->lud_exts[i]; i++)
LDAP_TRACE (("exts[%d] '%s'\n", i, ludp->lud_exts[i]));
success:
if(!unescape_elements(conn->data, ludp))
return LDAP_NO_MEMORY;
return LDAP_SUCCESS;
}
static int _ldap_url_parse (const struct connectdata *conn,
LDAPURLDesc **ludpp)
{
LDAPURLDesc *ludp = calloc(1, sizeof(*ludp));
int rc;
*ludpp = NULL;
if(!ludp)
return LDAP_NO_MEMORY;
rc = _ldap_url_parse2 (conn, ludp);
if(rc != LDAP_SUCCESS) {
_ldap_free_urldesc(ludp);
ludp = NULL;
}
*ludpp = ludp;
return (rc);
}
static void _ldap_free_urldesc (LDAPURLDesc *ludp)
{
int i;
if(!ludp)
return;
if(ludp->lud_dn)
free(ludp->lud_dn);
if(ludp->lud_filter)
free(ludp->lud_filter);
if(ludp->lud_attrs) {
for(i = 0; ludp->lud_attrs[i]; i++)
free(ludp->lud_attrs[i]);
free(ludp->lud_attrs);
}
if(ludp->lud_exts) {
for(i = 0; ludp->lud_exts[i]; i++)
free(ludp->lud_exts[i]);
free(ludp->lud_exts);
}
free (ludp);
}
#endif /* !HAVE_LDAP_URL_PARSE */
#endif /* !CURL_DISABLE_LDAP && !USE_OPENLDAP */
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