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428
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1 /* LDAP client interface for XEmacs.
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2 Copyright (C) 1998 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Not in FSF. */
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22
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23 /* Author: Oscar Figueiredo with lots of support from Hrvoje Niksic */
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24
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25 /* This file provides lisp primitives for access to an LDAP library
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26 conforming to the API defined in RFC 1823.
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27 It has been tested with:
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28 - UMich LDAP 3.3 (http://www.umich.edu/~dirsvcs/ldap/)
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29 - OpenLDAP 1.2 (http://www.openldap.org/)
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30 - Netscape's LDAP SDK (http://developer.netscape.com/) */
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31
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32
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33 #include <config.h>
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34 #include "lisp.h"
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35 #include "opaque.h"
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36 #include "sysdep.h"
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37 #include "buffer.h"
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38
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39 #include <errno.h>
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40
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41 #include "eldap.h"
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42
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43 static int ldap_default_port;
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44 static Lisp_Object Vldap_default_base;
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45
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46 /* Needed by the lrecord definition */
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47 Lisp_Object Qldapp;
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48
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49 /* ldap-open plist keywords */
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50 static Lisp_Object Qport, Qauth, Qbinddn, Qpasswd, Qderef, Qtimelimit, Qsizelimit;
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51 /* Search scope limits */
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52 static Lisp_Object Qbase, Qonelevel, Qsubtree;
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53 /* Authentication methods */
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54 static Lisp_Object Qkrbv41, Qkrbv42;
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55 /* Deref policy */
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56 static Lisp_Object Qnever, Qalways, Qfind;
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57
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58 /************************************************************************/
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59 /* Utility Functions */
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60 /************************************************************************/
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61
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62 static void
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63 signal_ldap_error (LDAP *ld, LDAPMessage *res, int ldap_err)
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64 {
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65 if (ldap_err <= 0)
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66 {
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67 #if defined HAVE_LDAP_PARSE_RESULT
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68 int err;
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69 ldap_err = ldap_parse_result (ld, res,
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70 &err,
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71 NULL, NULL, NULL, NULL, 0);
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72 if (ldap_err == LDAP_SUCCESS)
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73 ldap_err = err;
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74 #elif defined HAVE_LDAP_GET_LDERRNO
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75 ldap_err = ldap_get_lderrno (ld, NULL, NULL);
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76 #elif defined HAVE_LDAP_RESULT2ERROR
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77 ldap_err = ldap_result2error (ld, res, 0);
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78 #else
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79 ldap_err = ld->ld_errno;
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80 #endif
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81 }
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82 signal_simple_error ("LDAP error",
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83 build_string (ldap_err2string (ldap_err)));
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84 }
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85
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86
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87 /************************************************************************/
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88 /* ldap lrecord basic functions */
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89 /************************************************************************/
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90
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91 static Lisp_Object
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92 make_ldap (struct Lisp_LDAP *ldap)
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93 {
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94 Lisp_Object lisp_ldap;
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95 XSETLDAP (lisp_ldap, ldap);
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96 return lisp_ldap;
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97 }
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98
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99 static Lisp_Object
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100 mark_ldap (Lisp_Object obj)
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101 {
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102 return XLDAP (obj)->host;
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103 }
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104
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105 static void
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106 print_ldap (Lisp_Object obj, Lisp_Object printcharfun, int escapeflag)
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107 {
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108 char buf[32];
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109
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110 struct Lisp_LDAP *ldap = XLDAP (obj);
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111
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112 if (print_readably)
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113 error ("printing unreadable object #<ldap %s>",
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114 XSTRING_DATA (ldap->host));
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115
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116 write_c_string ("#<ldap ", printcharfun);
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117 print_internal (ldap->host, printcharfun, 1);
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118 if (!ldap->ld)
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119 write_c_string ("(dead) ",printcharfun);
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120 sprintf (buf, " 0x%x>", (unsigned int)ldap);
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121 write_c_string (buf, printcharfun);
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122 }
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123
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124 static struct Lisp_LDAP *
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125 allocate_ldap (void)
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126 {
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127 struct Lisp_LDAP *ldap =
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128 alloc_lcrecord_type (struct Lisp_LDAP, &lrecord_ldap);
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129
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130 ldap->ld = NULL;
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131 ldap->host = Qnil;
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132 return ldap;
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133 }
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134
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135 static void
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136 finalize_ldap (void *header, int for_disksave)
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137 {
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138 struct Lisp_LDAP *ldap = (struct Lisp_LDAP *) header;
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139
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140 if (for_disksave)
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141 signal_simple_error ("Can't dump an emacs containing LDAP objects",
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142 make_ldap (ldap));
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143
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144 if (ldap->ld)
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145 ldap_unbind (ldap->ld);
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146 ldap->ld = NULL;
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147 }
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148
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149 DEFINE_LRECORD_IMPLEMENTATION ("ldap", ldap,
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150 mark_ldap, print_ldap, finalize_ldap,
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151 NULL, NULL, 0, struct Lisp_LDAP);
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152
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153
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154
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155
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156 /************************************************************************/
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157 /* Basic ldap accessors */
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158 /************************************************************************/
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159
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160 DEFUN ("ldapp", Fldapp, 1, 1, 0, /*
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161 Return t if OBJECT is a LDAP connection.
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162 */
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163 (object))
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164 {
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165 return LDAPP (object) ? Qt : Qnil;
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166 }
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167
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168 DEFUN ("ldap-host", Fldap_host, 1, 1, 0, /*
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169 Return the server host of the connection LDAP, as a string.
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170 */
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171 (ldap))
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172 {
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173 CHECK_LDAP (ldap);
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174 return (XLDAP (ldap))->host;
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175 }
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176
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177 DEFUN ("ldap-live-p", Fldap_status, 1, 1, 0, /*
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178 Return t if LDAP is an active LDAP connection.
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179 */
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180 (ldap))
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181 {
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182 CHECK_LDAP (ldap);
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183 return (XLDAP (ldap))->ld ? Qt : Qnil;
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184 }
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185
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186 /************************************************************************/
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187 /* Opening/Closing a LDAP connection */
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188 /************************************************************************/
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189
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190
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191 DEFUN ("ldap-open", Fldap_open, 1, 2, 0, /*
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192 Open a LDAP connection to HOST.
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193 PLIST is a plist containing additional parameters for the connection.
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194 Valid keys in that list are:
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195 `port' the TCP port to use for the connection if different from
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196 `ldap-default-port'.
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197 `auth' is the authentication method to use, possible values depend on
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198 the LDAP library XEmacs was compiled with: `simple', `krbv41' and `krbv42'.
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199 `binddn' is the distinguished name of the user to bind as (in RFC 1779 syntax).
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200 `passwd' is the password to use for simple authentication.
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201 `deref' is one of the symbols `never', `always', `search' or `find'.
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202 `timelimit' is the timeout limit for the connection in seconds.
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203 `sizelimit' is the maximum number of matches to return.
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204 */
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205 (host, plist))
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206 {
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207 /* This function can GC */
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208 struct Lisp_LDAP *ldap;
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209 LDAP *ld;
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210 int ldap_port = 0;
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211 int ldap_auth = LDAP_AUTH_SIMPLE;
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212 char *ldap_binddn = NULL;
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213 char *ldap_passwd = NULL;
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214 int ldap_deref = LDAP_DEREF_NEVER;
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215 int ldap_timelimit = 0;
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216 int ldap_sizelimit = 0;
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217 int err;
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218
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219 Lisp_Object list, keyword, value;
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220
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221 CHECK_STRING (host);
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222
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223 EXTERNAL_PROPERTY_LIST_LOOP (list, keyword, value, plist)
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224 {
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225 /* TCP Port */
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226 if (EQ (keyword, Qport))
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227 {
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228 CHECK_INT (value);
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229 ldap_port = XINT (value);
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230 }
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231 /* Authentication method */
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232 if (EQ (keyword, Qauth))
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233 {
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234 if (EQ (value, Qsimple))
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235 ldap_auth = LDAP_AUTH_SIMPLE;
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236 #ifdef LDAP_AUTH_KRBV41
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237 else if (EQ (value, Qkrbv41))
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238 ldap_auth = LDAP_AUTH_KRBV41;
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239 #endif
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240 #ifdef LDAP_AUTH_KRBV42
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241 else if (EQ (value, Qkrbv42))
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242 ldap_auth = LDAP_AUTH_KRBV42;
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243 #endif
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244 else
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245 signal_simple_error ("Invalid authentication method", value);
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246 }
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247 /* Bind DN */
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248 else if (EQ (keyword, Qbinddn))
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249 {
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250 CHECK_STRING (value);
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251 GET_C_STRING_OS_DATA_ALLOCA (value, ldap_binddn);
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252 }
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253 /* Password */
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254 else if (EQ (keyword, Qpasswd))
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255 {
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256 CHECK_STRING (value);
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257 GET_C_STRING_OS_DATA_ALLOCA (value, ldap_passwd);
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258 }
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259 /* Deref */
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260 else if (EQ (keyword, Qderef))
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261 {
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262 if (EQ (value, Qnever))
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263 ldap_deref = LDAP_DEREF_NEVER;
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264 else if (EQ (value, Qsearch))
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265 ldap_deref = LDAP_DEREF_SEARCHING;
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266 else if (EQ (value, Qfind))
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267 ldap_deref = LDAP_DEREF_FINDING;
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268 else if (EQ (value, Qalways))
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269 ldap_deref = LDAP_DEREF_ALWAYS;
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270 else
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271 signal_simple_error ("Invalid deref value", value);
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272 }
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273 /* Timelimit */
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274 else if (EQ (keyword, Qtimelimit))
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275 {
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276 CHECK_INT (value);
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277 ldap_timelimit = XINT (value);
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278 }
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279 /* Sizelimit */
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280 else if (EQ (keyword, Qsizelimit))
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281 {
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282 CHECK_INT (value);
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283 ldap_sizelimit = XINT (value);
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284 }
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285 }
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286
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287 if (ldap_port == 0)
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288 {
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289 ldap_port = ldap_default_port;
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290 }
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291
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292 /* Connect to the server and bind */
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293 slow_down_interrupts ();
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294 ld = ldap_open ((char *)XSTRING_DATA (host), ldap_port);
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295 speed_up_interrupts ();
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296
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297 if (ld == NULL )
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298 signal_simple_error_2 ("Failed connecting to host",
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299 host,
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300 lisp_strerror (errno));
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301
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302
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303 #ifdef HAVE_LDAP_SET_OPTION
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304 if ((err = ldap_set_option (ld, LDAP_OPT_DEREF,
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305 (void *)&ldap_deref)) != LDAP_SUCCESS)
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306 signal_ldap_error (ld, NULL, err);
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307 if ((err = ldap_set_option (ld, LDAP_OPT_TIMELIMIT,
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308 (void *)&ldap_timelimit)) != LDAP_SUCCESS)
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309 signal_ldap_error (ld, NULL, err);
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310 if ((err = ldap_set_option (ld, LDAP_OPT_SIZELIMIT,
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311 (void *)&ldap_sizelimit)) != LDAP_SUCCESS)
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312 signal_ldap_error (ld, NULL, err);
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313 if ((err = ldap_set_option (ld, LDAP_OPT_REFERRALS,
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314 LDAP_OPT_ON)) != LDAP_SUCCESS)
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315 signal_ldap_error (ld, NULL, err);
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316 #else /* not HAVE_LDAP_SET_OPTION */
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317 ld->ld_deref = ldap_deref;
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318 ld->ld_timelimit = ldap_timelimit;
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319 ld->ld_sizelimit = ldap_sizelimit;
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320 #ifdef LDAP_REFERRALS
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321 ld->ld_options = LDAP_OPT_REFERRALS;
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322 #else /* not LDAP_REFERRALS */
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323 ld->ld_options = 0;
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324 #endif /* not LDAP_REFERRALS */
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325 #endif /* not HAVE_LDAP_SET_OPTION */
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326
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327 /* ldap_bind_s calls select and may be wedged by SIGIO. */
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328 slow_down_interrupts ();
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329 err = ldap_bind_s (ld, ldap_binddn, ldap_passwd, ldap_auth);
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330 speed_up_interrupts ();
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331 if (err != LDAP_SUCCESS)
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332 signal_simple_error ("Failed binding to the server",
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333 build_string (ldap_err2string (err)));
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334
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335 ldap = allocate_ldap ();
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336 ldap->ld = ld;
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337 ldap->host = host;
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338
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339 return make_ldap (ldap);
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340 }
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341
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342
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343
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344 DEFUN ("ldap-close", Fldap_close, 1, 1, 0, /*
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345 Close an LDAP connection.
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346 */
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347 (ldap))
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348 {
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349 struct Lisp_LDAP *lldap;
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350 CHECK_LIVE_LDAP (ldap);
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351 lldap = XLDAP (ldap);
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352 ldap_unbind (lldap->ld);
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353 lldap->ld = NULL;
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354 return Qnil;
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355 }
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356
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357
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358
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359 /************************************************************************/
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360 /* Working on a LDAP connection */
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361 /************************************************************************/
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362 struct ldap_unwind_struct
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363 {
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364 LDAPMessage *res;
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365 struct berval **vals;
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366 };
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367
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368
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369 static Lisp_Object
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370 ldap_search_unwind (Lisp_Object unwind_obj)
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371 {
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372 struct ldap_unwind_struct *unwind =
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373 (struct ldap_unwind_struct *) get_opaque_ptr (unwind_obj);
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374 if (unwind->res)
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375 ldap_msgfree (unwind->res);
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376 if (unwind->vals)
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377 ldap_value_free_len (unwind->vals);
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378 return Qnil;
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379 }
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380
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381 DEFUN ("ldap-search-internal", Fldap_search_internal, 2, 7, 0, /*
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382 Perform a search on an open LDAP connection.
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383 LDAP is an LDAP connection object created with `ldap-open'.
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384 FILTER is a filter string for the search as described in RFC 1558.
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385 BASE is the distinguished name at which to start the search.
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386 SCOPE is one of the symbols `base', `onelevel' or `subtree' indicating
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387 the scope of the search.
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388 ATTRS is a list of strings indicating which attributes to retrieve
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389 for each matching entry. If nil return all available attributes.
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390 If ATTRSONLY is non-nil then only the attributes are retrieved, not
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391 the associated values.
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392 If WITHDN is non-nil each entry in the result will be prepennded with
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393 its distinguished name DN.
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394 The function returns a list of matching entries. Each entry is itself
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395 an alist of attribute/value pairs optionally preceded by the DN of the
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396 entry according to the value of WITHDN.
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397 */
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398 (ldap, filter, base, scope, attrs, attrsonly, withdn))
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399 {
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400 /* This function can GC */
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401
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402 /* Vars for query */
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403 LDAP *ld;
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404 LDAPMessage *e;
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405 BerElement *ptr;
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406 char *a, *dn;
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407 int i, rc, rc2;
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408 int matches;
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409 struct ldap_unwind_struct unwind;
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410
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411 int ldap_scope = LDAP_SCOPE_SUBTREE;
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412 char **ldap_attributes = NULL;
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413
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414 int speccount = specpdl_depth ();
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415
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416 Lisp_Object list, entry, result;
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417 struct gcpro gcpro1, gcpro2, gcpro3;
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418
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419 list = entry = result = Qnil;
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420 GCPRO3 (list, entry, result);
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421
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422 unwind.res = NULL;
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423 unwind.vals = NULL;
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424
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425 /* Do all the parameter checking */
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426 CHECK_LIVE_LDAP (ldap);
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427 ld = XLDAP (ldap)->ld;
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428
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429 /* Filter */
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430 CHECK_STRING (filter);
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431
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432 /* Search base */
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433 if (NILP (base))
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434 {
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435 base = Vldap_default_base;
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436 }
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437 if (!NILP (base))
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438 {
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439 CHECK_STRING (base);
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440 }
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441
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442 /* Search scope */
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443 if (!NILP (scope))
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444 {
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445 if (EQ (scope, Qbase))
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446 ldap_scope = LDAP_SCOPE_BASE;
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447 else if (EQ (scope, Qonelevel))
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448 ldap_scope = LDAP_SCOPE_ONELEVEL;
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449 else if (EQ (scope, Qsubtree))
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450 ldap_scope = LDAP_SCOPE_SUBTREE;
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451 else
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452 signal_simple_error ("Invalid scope", scope);
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453 }
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454
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455 /* Attributes to search */
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456 if (!NILP (attrs))
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457 {
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458 CHECK_CONS (attrs);
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459 ldap_attributes = alloca_array (char *, 1 + XINT (Flength (attrs)));
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460
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461 i = 0;
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462 EXTERNAL_LIST_LOOP (attrs, attrs)
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463 {
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464 Lisp_Object current = XCAR (attrs);
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465 CHECK_STRING (current);
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466 GET_C_STRING_OS_DATA_ALLOCA (current, ldap_attributes[i]);
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467 ++i;
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468 }
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469 ldap_attributes[i] = NULL;
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470 }
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471
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472 /* Attributes only ? */
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473 CHECK_SYMBOL (attrsonly);
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474
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475 /* Perform the search */
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476 if (ldap_search (ld,
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477 NILP (base) ? "" : (char *) XSTRING_DATA (base),
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478 ldap_scope,
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479 NILP (filter) ? "" : (char *) XSTRING_DATA (filter),
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480 ldap_attributes,
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481 NILP (attrsonly) ? 0 : 1)
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482 == -1)
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483 {
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484 signal_ldap_error (ld, NULL, 0);
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485 }
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486
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487 /* Ensure we don't exit without cleaning up */
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488 record_unwind_protect (ldap_search_unwind,
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489 make_opaque_ptr (&unwind));
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490
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491 /* Build the results list */
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492 matches = 0;
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493
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494 /* ldap_result calls select() and can get wedged by EINTR signals */
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495 slow_down_interrupts ();
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496 rc = ldap_result (ld, LDAP_RES_ANY, 0, NULL, &unwind.res);
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497 speed_up_interrupts ();
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498 while (rc == LDAP_RES_SEARCH_ENTRY)
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499 {
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500 QUIT;
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501 matches ++;
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502 e = ldap_first_entry (ld, unwind.res);
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503 /* #### This call to message() is pretty fascist, because it
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504 destroys the current echo area contents, even when invoked
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505 from Lisp. It should use echo_area_message() instead, and
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506 restore the old echo area contents later. */
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507 message ("Parsing ldap results... %d", matches);
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508 entry = Qnil;
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509 /* Get the DN if required */
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510 if (! NILP (withdn))
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511 {
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512 dn = ldap_get_dn (ld, e);
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513 if (dn == NULL)
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514 signal_ldap_error (ld, e, 0);
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515 entry = Fcons (build_ext_string (dn, FORMAT_OS), Qnil);
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516 }
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517 for (a= ldap_first_attribute (ld, e, &ptr);
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518 a != NULL;
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519 a = ldap_next_attribute (ld, e, ptr) )
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520 {
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521 list = Fcons (build_ext_string (a, FORMAT_OS), Qnil);
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522 unwind.vals = ldap_get_values_len (ld, e, a);
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523 if (unwind.vals != NULL)
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524 {
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525 for (i = 0; unwind.vals[i] != NULL; i++)
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526 {
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527 list = Fcons (make_ext_string (unwind.vals[i]->bv_val,
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528 unwind.vals[i]->bv_len,
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529 FORMAT_OS),
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530 list);
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531 }
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532 }
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533 entry = Fcons (Fnreverse (list),
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534 entry);
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535 ldap_value_free_len (unwind.vals);
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536 unwind.vals = NULL;
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537 }
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538 result = Fcons (Fnreverse (entry),
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539 result);
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540 ldap_msgfree (unwind.res);
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541 unwind.res = NULL;
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542
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543 slow_down_interrupts ();
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544 rc = ldap_result (ld, LDAP_RES_ANY, 0, NULL, &(unwind.res));
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545 speed_up_interrupts ();
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546 }
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547
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548 if (rc == -1)
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549 signal_ldap_error (ld, unwind.res, 0);
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550
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551 if (rc == 0)
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552 signal_ldap_error (ld, NULL, LDAP_TIMELIMIT_EXCEEDED);
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553
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554 #if defined HAVE_LDAP_PARSE_RESULT
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555 rc2 = ldap_parse_result (ld, unwind.res,
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556 &rc,
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557 NULL, NULL, NULL, NULL, 0);
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558 if (rc2 != LDAP_SUCCESS)
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559 rc = rc2;
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560 #elif defined HAVE_LDAP_RESULT2ERROR
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561 rc = ldap_result2error (ld, unwind.res, 0);
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562 #endif
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563 if ((rc != LDAP_SUCCESS) && (rc != LDAP_SIZELIMIT_EXCEEDED))
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564 signal_ldap_error (ld, NULL, rc);
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565
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566 ldap_msgfree (unwind.res);
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567 unwind.res = (LDAPMessage *)NULL;
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568 /* #### See above for calling message(). */
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569 message ("Parsing ldap results... done");
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570
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571 unbind_to (speccount, Qnil);
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572 UNGCPRO;
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573 return Fnreverse (result);
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574 }
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575
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576
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577 void
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578 syms_of_eldap (void)
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579 {
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580 defsymbol (&Qldapp, "ldapp");
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581 defsymbol (&Qport, "port");
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582 defsymbol (&Qauth, "auth");
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583 defsymbol (&Qbinddn, "binddn");
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584 defsymbol (&Qpasswd, "passwd");
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585 defsymbol (&Qderef, "deref");
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586 defsymbol (&Qtimelimit, "timelimit");
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587 defsymbol (&Qsizelimit, "sizelimit");
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588 defsymbol (&Qbase, "base");
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589 defsymbol (&Qonelevel, "onelevel");
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590 defsymbol (&Qsubtree, "subtree");
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591 defsymbol (&Qkrbv41, "krbv41");
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592 defsymbol (&Qkrbv42, "krbv42");
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593 defsymbol (&Qnever, "never");
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594 defsymbol (&Qalways, "always");
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595 defsymbol (&Qfind, "find");
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596
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597 DEFSUBR (Fldapp);
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598 DEFSUBR (Fldap_host);
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599 DEFSUBR (Fldap_status);
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600 DEFSUBR (Fldap_open);
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601 DEFSUBR (Fldap_close);
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602 DEFSUBR (Fldap_search_internal);
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603 }
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604
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605 void
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606 vars_of_eldap (void)
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607 {
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608
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609 ldap_default_port = LDAP_PORT;
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610 Vldap_default_base = Qnil;
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611
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612 DEFVAR_INT ("ldap-default-port", &ldap_default_port /*
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613 Default TCP port for LDAP connections.
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614 Initialized from the LDAP library. Default value is 389.
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615 */ );
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616
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617 DEFVAR_LISP ("ldap-default-base", &Vldap_default_base /*
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618 Default base for LDAP searches.
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619 This is a string using the syntax of RFC 1779.
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620 For instance, "o=ACME, c=US" limits the search to the
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621 Acme organization in the United States.
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622 */ );
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623
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624 }
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625
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626
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