s4:lib: merge LDB_WRAP and LDBSAMBA and make LDBSAMBA a library.
[kamenim/samba.git] / source4 / ldap_server / ldap_backend.c
index 27b9c879bba25d10b4034e9ceacf81a8b8762335..34d59b53cd0c3af8ee61959b33b97b33286c8c80 100644 (file)
 #include "includes.h"
 #include "ldap_server/ldap_server.h"
 #include "../lib/util/dlinklist.h"
-#include "libcli/ldap/ldap.h"
 #include "auth/credentials/credentials.h"
 #include "auth/gensec/gensec.h"
 #include "param/param.h"
 #include "smbd/service_stream.h"
 #include "dsdb/samdb/samdb.h"
 #include "lib/ldb/include/ldb_errors.h"
-#include "lib/ldb_wrap.h"
+#include "ldb_wrap.h"
 
 #define VALID_DN_SYNTAX(dn) do {\
        if (!(dn)) {\
                return NT_STATUS_NO_MEMORY;\
        } else if ( ! ldb_dn_validate(dn)) {\
                result = LDAP_INVALID_DN_SYNTAX;\
-               map_ldb_error(local_ctx, LDB_ERR_INVALID_DN_SYNTAX, &errstr);\
+               map_ldb_error(local_ctx, LDB_ERR_INVALID_DN_SYNTAX, NULL,\
+                             &errstr);\
                goto reply;\
        }\
 } while(0)
 
 static int map_ldb_error(TALLOC_CTX *mem_ctx, int ldb_err,
-       const char **errstring)
+       const char *add_err_string, const char **errstring)
 {
        WERROR err;
 
@@ -167,10 +167,59 @@ static int map_ldb_error(TALLOC_CTX *mem_ctx, int ldb_err,
 
        *errstring = talloc_asprintf(mem_ctx, "%08x: %s", W_ERROR_V(err),
                ldb_strerror(ldb_err));
+       if (add_err_string != NULL) {
+               *errstring = talloc_asprintf(mem_ctx, "%s - %s", *errstring,
+                                            add_err_string);
+       }
        
        /* result is 1:1 for now */
        return ldb_err;
 }
+/* create and execute a modify request */
+static int ldb_mod_req_with_controls(struct ldb_context *ldb,
+                                    const struct ldb_message *message,
+                                    struct ldb_control **controls,
+                                    void *context)
+{
+       struct ldb_request *req;
+       int ret;
+
+       ret = ldb_msg_sanity_check(ldb, message);
+       if (ret != LDB_SUCCESS) {
+               return ret;
+       }
+
+       ret = ldb_build_mod_req(&req, ldb, ldb,
+                                       message,
+                                       controls,
+                                       context,
+                                       ldb_modify_default_callback,
+                                       NULL);
+
+       if (ret != LDB_SUCCESS) {
+               return ret;
+       }
+
+       ret = ldb_transaction_start(ldb);
+       if (ret != LDB_SUCCESS) {
+               return ret;
+       }
+
+       ret = ldb_request(ldb, req);
+       if (ret == LDB_SUCCESS) {
+               ret = ldb_wait(req->handle, LDB_WAIT_ALL);
+       }
+
+       if (ret == LDB_SUCCESS) {
+               ret = ldb_transaction_commit(ldb);
+       }
+       else {
+               ldb_transaction_cancel(ldb);
+       }
+
+       talloc_free(req);
+       return ret;
+}
 
 /*
   connect to the sam database
@@ -182,8 +231,8 @@ NTSTATUS ldapsrv_backend_Init(struct ldapsrv_connection *conn)
                                     conn->lp_ctx,
                                     lp_sam_url(conn->lp_ctx), 
                                     conn->session_info,
-                                    samdb_credentials(conn, conn->connection->event.ctx, conn->lp_ctx), 
-                                    conn->global_catalog ? LDB_FLG_RDONLY : 0, NULL);
+                                    samdb_credentials(conn->connection->event.ctx, conn->lp_ctx), 
+                                    conn->global_catalog ? LDB_FLG_RDONLY : 0);
        if (conn->ldb == NULL) {
                return NT_STATUS_INTERNAL_DB_CORRUPTION;
        }
@@ -193,7 +242,7 @@ NTSTATUS ldapsrv_backend_Init(struct ldapsrv_connection *conn)
                struct gensec_security_ops **backends = gensec_security_all();
                struct gensec_security_ops **ops
                        = gensec_use_kerberos_mechs(conn, backends, conn->server_credentials);
-               int i, j = 0;
+               unsigned int i, j = 0;
                for (i = 0; ops && ops[i]; i++) {
                        if (!lp_parm_bool(conn->lp_ctx,  NULL, "gensec", ops[i]->name, ops[i]->enabled))
                                continue;
@@ -271,6 +320,124 @@ static NTSTATUS ldapsrv_unwilling(struct ldapsrv_call *call, int error)
        return NT_STATUS_OK;
 }
 
+int ldb_add_with_context(struct ldb_context *ldb,
+                        const struct ldb_message *message,
+                        void *context)
+{
+       struct ldb_request *req;
+       int ret;
+
+       ret = ldb_msg_sanity_check(ldb, message);
+       if (ret != LDB_SUCCESS) {
+               return ret;
+       }
+
+       ret = ldb_build_add_req(&req, ldb, ldb,
+                                       message,
+                                       NULL,
+                                       context,
+                                       ldb_modify_default_callback,
+                                       NULL);
+
+       if (ret != LDB_SUCCESS) return ret;
+
+       ret = ldb_transaction_start(ldb);
+       if (ret != LDB_SUCCESS) {
+               return ret;
+       }
+
+       ret = ldb_request(ldb, req);
+       if (ret == LDB_SUCCESS) {
+               ret = ldb_wait(req->handle, LDB_WAIT_ALL);
+       }
+
+       if (ret == LDB_SUCCESS) {
+               ret = ldb_transaction_commit(ldb);
+       }
+       else {
+               ldb_transaction_cancel(ldb);
+       }
+
+       talloc_free(req);
+       return ret;
+}
+
+int ldb_delete_with_context(struct ldb_context *ldb,
+                           struct ldb_dn *dn,
+                           void *context)
+{
+       struct ldb_request *req;
+       int ret;
+
+       ret = ldb_build_del_req(&req, ldb, ldb,
+                                       dn,
+                                       NULL,
+                                       context,
+                                       ldb_modify_default_callback,
+                                       NULL);
+
+       if (ret != LDB_SUCCESS) return ret;
+
+       ret = ldb_transaction_start(ldb);
+       if (ret != LDB_SUCCESS) {
+               return ret;
+       }
+
+       ret = ldb_request(ldb, req);
+       if (ret == LDB_SUCCESS) {
+               ret = ldb_wait(req->handle, LDB_WAIT_ALL);
+       }
+
+       if (ret == LDB_SUCCESS) {
+               ret = ldb_transaction_commit(ldb);
+       }
+       else {
+               ldb_transaction_cancel(ldb);
+       }
+
+       talloc_free(req);
+       return ret;
+}
+
+int ldb_rename_with_context(struct ldb_context *ldb,
+              struct ldb_dn *olddn,
+              struct ldb_dn *newdn,
+              void *context)
+{
+       struct ldb_request *req;
+       int ret;
+
+       ret = ldb_build_rename_req(&req, ldb, ldb,
+                                       olddn,
+                                       newdn,
+                                       NULL,
+                                       context,
+                                       ldb_modify_default_callback,
+                                       NULL);
+
+       if (ret != LDB_SUCCESS) return ret;
+
+       ret = ldb_transaction_start(ldb);
+       if (ret != LDB_SUCCESS) {
+               return ret;
+       }
+
+       ret = ldb_request(ldb, req);
+       if (ret == LDB_SUCCESS) {
+               ret = ldb_wait(req->handle, LDB_WAIT_ALL);
+       }
+
+       if (ret == LDB_SUCCESS) {
+               ret = ldb_transaction_commit(ldb);
+       }
+       else {
+               ldb_transaction_cancel(ldb);
+       }
+
+       talloc_free(req);
+       return ret;
+}
+
 static NTSTATUS ldapsrv_SearchRequest(struct ldapsrv_call *call)
 {
        struct ldap_SearchRequest *req = &call->request->r.SearchRequest;
@@ -292,7 +459,7 @@ static NTSTATUS ldapsrv_SearchRequest(struct ldapsrv_call *call)
        int success_limit = 1;
        int result = -1;
        int ldb_ret = -1;
-       int i, j;
+       unsigned int i, j;
        int extended_type = 1;
 
        DEBUG(10, ("SearchRequest"));
@@ -326,7 +493,7 @@ static NTSTATUS ldapsrv_SearchRequest(struct ldapsrv_call *call)
                        break;
                default:
                        result = LDAP_PROTOCOL_ERROR;
-                       map_ldb_error(local_ctx, LDB_ERR_PROTOCOL_ERROR,
+                       map_ldb_error(local_ctx, LDB_ERR_PROTOCOL_ERROR, NULL,
                                &errstr);
                        errstr = talloc_asprintf(local_ctx,
                                "%s. Invalid scope", errstr);
@@ -431,6 +598,28 @@ static NTSTATUS ldapsrv_SearchRequest(struct ldapsrv_call *call)
 queue_reply:
                        ldapsrv_queue_reply(call, ent_r);
                }
+
+               /* Send back referrals if they do exist (search operations) */
+               if (res->refs != NULL) {
+                       char **ref;
+                       struct ldap_SearchResRef *ent_ref;
+
+                       for (ref = res->refs; *ref != NULL; ++ref) {
+                               ent_r = ldapsrv_init_reply(call, LDAP_TAG_SearchResultReference);
+                               NT_STATUS_HAVE_NO_MEMORY(ent_r);
+
+                               /* Better to have the whole referrals kept here,
+                                * than to find someone further up didn't put
+                                * a value in the right spot in the talloc tree
+                                */
+                               talloc_steal(ent_r, *ref);
+
+                               ent_ref = &ent_r->msg->r.SearchResultReference;
+                               ent_ref->referral = *ref;
+
+                               ldapsrv_queue_reply(call, ent_r);
+                       }
+               }
        }
 
 reply:
@@ -454,7 +643,8 @@ reply:
                }
        } else {
                DEBUG(10,("SearchRequest: error\n"));
-               result = map_ldb_error(local_ctx, ldb_ret, &errstr);
+               result = map_ldb_error(local_ctx, ldb_ret, ldb_errstring(samdb),
+                                      &errstr);
        }
 
        done->resultcode = result;
@@ -478,7 +668,8 @@ static NTSTATUS ldapsrv_ModifyRequest(struct ldapsrv_call *call)
        const char *errstr = NULL;
        int result = LDAP_SUCCESS;
        int ldb_ret;
-       int i,j;
+       unsigned int i,j;
+       struct ldb_result *res = NULL;
 
        DEBUG(10, ("ModifyRequest"));
        DEBUGADD(10, (" dn: %s", req->dn));
@@ -512,7 +703,7 @@ static NTSTATUS ldapsrv_ModifyRequest(struct ldapsrv_call *call)
                        default:
                                result = LDAP_PROTOCOL_ERROR;
                                map_ldb_error(local_ctx,
-                                       LDB_ERR_PROTOCOL_ERROR, &errstr);
+                                       LDB_ERR_PROTOCOL_ERROR, NULL, &errstr);
                                errstr = talloc_asprintf(local_ctx,
                                        "%s. Invalid LDAP_MODIFY_* type", errstr);
                                goto reply;
@@ -534,26 +725,11 @@ static NTSTATUS ldapsrv_ModifyRequest(struct ldapsrv_call *call)
                                NT_STATUS_HAVE_NO_MEMORY(msg->elements[i].values);
 
                                for (j=0; j < msg->elements[i].num_values; j++) {
-                                       if (!(req->mods[i].attrib.values[j].length > 0)) {
-                                               result = LDAP_OTHER;
-
-                                               map_ldb_error(local_ctx,
-                                                       LDB_ERR_OTHER, &errstr);
-                                               errstr = talloc_asprintf(local_ctx,
-                                                       "%s. Empty attribute values not allowed", errstr);
-                                               goto reply;
-                                       }
                                        msg->elements[i].values[j].length = req->mods[i].attrib.values[j].length;
                                        msg->elements[i].values[j].data = req->mods[i].attrib.values[j].data;                   
                                }
                        }
                }
-       } else {
-               result = LDAP_OTHER;
-               map_ldb_error(local_ctx, LDB_ERR_OTHER, &errstr);
-               errstr = talloc_asprintf(local_ctx,
-                       "%s. No mods are not allowed", errstr);
-               goto reply;
        }
 
 reply:
@@ -561,16 +737,27 @@ reply:
        NT_STATUS_HAVE_NO_MEMORY(modify_reply);
 
        if (result == LDAP_SUCCESS) {
-               ldb_ret = ldb_modify(samdb, msg);
-               result = map_ldb_error(local_ctx, ldb_ret, &errstr);
+               res = talloc_zero(local_ctx, struct ldb_result);
+               NT_STATUS_HAVE_NO_MEMORY(res);
+               ldb_ret = ldb_mod_req_with_controls(samdb, msg, call->request->controls, res);
+               result = map_ldb_error(local_ctx, ldb_ret, ldb_errstring(samdb),
+                                      &errstr);
        }
 
        modify_result = &modify_reply->msg->r.AddResponse;
        modify_result->dn = NULL;
-       modify_result->resultcode = result;
-       modify_result->errormessage = (errstr?talloc_strdup(modify_reply, errstr):NULL);
-       modify_result->referral = NULL;
 
+       if (res->refs != NULL) {
+               modify_result->resultcode = map_ldb_error(local_ctx,
+                                                         LDB_ERR_REFERRAL,
+                                                         NULL, &errstr);
+               modify_result->errormessage = (errstr?talloc_strdup(modify_reply, errstr):NULL);
+               modify_result->referral = talloc_strdup(call, *res->refs);
+       } else {
+               modify_result->resultcode = result;
+               modify_result->errormessage = (errstr?talloc_strdup(modify_reply, errstr):NULL);
+               modify_result->referral = NULL;
+       }
        talloc_free(local_ctx);
 
        ldapsrv_queue_reply(call, modify_reply);
@@ -590,7 +777,8 @@ static NTSTATUS ldapsrv_AddRequest(struct ldapsrv_call *call)
        const char *errstr = NULL;
        int result = LDAP_SUCCESS;
        int ldb_ret;
-       int i,j;
+       unsigned int i,j;
+       struct ldb_result *res = NULL;
 
        DEBUG(10, ("AddRequest"));
        DEBUGADD(10, (" dn: %s", req->dn));
@@ -628,31 +816,11 @@ static NTSTATUS ldapsrv_AddRequest(struct ldapsrv_call *call)
                                NT_STATUS_HAVE_NO_MEMORY(msg->elements[i].values);
 
                                for (j=0; j < msg->elements[i].num_values; j++) {
-                                       if (!(req->attributes[i].values[j].length > 0)) {
-                                               result = LDAP_OTHER;
-                                               map_ldb_error(local_ctx,
-                                                       LDB_ERR_OTHER, &errstr);
-                                               errstr = talloc_asprintf(local_ctx,
-                                                       "%s. Empty attribute values not allowed", errstr);
-                                               goto reply;
-                                       }
                                        msg->elements[i].values[j].length = req->attributes[i].values[j].length;
                                        msg->elements[i].values[j].data = req->attributes[i].values[j].data;                    
                                }
-                       } else {
-                               result = LDAP_OTHER;
-                               map_ldb_error(local_ctx, LDB_ERR_OTHER, &errstr);
-                               errstr = talloc_asprintf(local_ctx,
-                                       "%s. No attribute values are not allowed", errstr);
-                               goto reply;
                        }
                }
-       } else {
-               result = LDAP_OTHER;
-               map_ldb_error(local_ctx, LDB_ERR_OTHER, &errstr);
-               errstr = talloc_asprintf(local_ctx, 
-                       "%s. No attributes are not allowed", errstr);
-               goto reply;
        }
 
 reply:
@@ -660,16 +828,26 @@ reply:
        NT_STATUS_HAVE_NO_MEMORY(add_reply);
 
        if (result == LDAP_SUCCESS) {
-               ldb_ret = ldb_add(samdb, msg);
-               result = map_ldb_error(local_ctx, ldb_ret, &errstr);
+               res = talloc_zero(local_ctx, struct ldb_result);
+               NT_STATUS_HAVE_NO_MEMORY(res);
+               ldb_ret = ldb_add_with_context(samdb, msg, res);
+               result = map_ldb_error(local_ctx, ldb_ret, ldb_errstring(samdb),
+                                      &errstr);
        }
 
        add_result = &add_reply->msg->r.AddResponse;
        add_result->dn = NULL;
-       add_result->resultcode = result;
-       add_result->errormessage = (errstr?talloc_strdup(add_reply,errstr):NULL);
-       add_result->referral = NULL;
-
+       if (res->refs != NULL) {
+               add_result->resultcode =  map_ldb_error(local_ctx,
+                                                       LDB_ERR_REFERRAL, NULL,
+                                                       &errstr);
+               add_result->errormessage = (errstr?talloc_strdup(add_reply,errstr):NULL);
+               add_result->referral = talloc_strdup(call, *res->refs);
+       } else {
+               add_result->resultcode = result;
+               add_result->errormessage = (errstr?talloc_strdup(add_reply,errstr):NULL);
+               add_result->referral = NULL;
+       }
        talloc_free(local_ctx);
 
        ldapsrv_queue_reply(call, add_reply);
@@ -688,6 +866,7 @@ static NTSTATUS ldapsrv_DelRequest(struct ldapsrv_call *call)
        const char *errstr = NULL;
        int result = LDAP_SUCCESS;
        int ldb_ret;
+       struct ldb_result *res = NULL;
 
        DEBUG(10, ("DelRequest"));
        DEBUGADD(10, (" dn: %s", req->dn));
@@ -705,15 +884,26 @@ reply:
        NT_STATUS_HAVE_NO_MEMORY(del_reply);
 
        if (result == LDAP_SUCCESS) {
-               ldb_ret = ldb_delete(samdb, dn);
-               result = map_ldb_error(local_ctx, ldb_ret, &errstr);
+               res = talloc_zero(local_ctx, struct ldb_result);
+               NT_STATUS_HAVE_NO_MEMORY(res);
+               ldb_ret = ldb_delete_with_context(samdb, dn, res);
+               result = map_ldb_error(local_ctx, ldb_ret, ldb_errstring(samdb),
+                                      &errstr);
        }
 
        del_result = &del_reply->msg->r.DelResponse;
        del_result->dn = NULL;
-       del_result->resultcode = result;
-       del_result->errormessage = (errstr?talloc_strdup(del_reply,errstr):NULL);
-       del_result->referral = NULL;
+       if (res->refs != NULL) {
+               del_result->resultcode = map_ldb_error(local_ctx,
+                                                      LDB_ERR_REFERRAL, NULL,
+                                                      &errstr);
+               del_result->errormessage = (errstr?talloc_strdup(del_reply,errstr):NULL);
+               del_result->referral = talloc_strdup(call, *res->refs);
+       } else {
+               del_result->resultcode = result;
+               del_result->errormessage = (errstr?talloc_strdup(del_reply,errstr):NULL);
+               del_result->referral = NULL;
+       }
 
        talloc_free(local_ctx);
 
@@ -733,6 +923,7 @@ static NTSTATUS ldapsrv_ModifyDNRequest(struct ldapsrv_call *call)
        const char *errstr = NULL;
        int result = LDAP_SUCCESS;
        int ldb_ret;
+       struct ldb_result *res = NULL;
 
        DEBUG(10, ("ModifyDNRequest"));
        DEBUGADD(10, (" dn: %s", req->dn));
@@ -750,10 +941,18 @@ static NTSTATUS ldapsrv_ModifyDNRequest(struct ldapsrv_call *call)
        DEBUG(10, ("ModifyDNRequest: olddn: [%s]\n", req->dn));
        DEBUG(10, ("ModifyDNRequest: newrdn: [%s]\n", req->newrdn));
 
+       if (ldb_dn_get_comp_num(newrdn) != 1) {
+               result = LDAP_INVALID_DN_SYNTAX;
+               map_ldb_error(local_ctx, LDB_ERR_INVALID_DN_SYNTAX, NULL,
+                             &errstr);
+               goto reply;
+       }
+
        /* we can't handle the rename if we should not remove the old dn */
        if (!req->deleteolddn) {
                result = LDAP_UNWILLING_TO_PERFORM;
-               map_ldb_error(local_ctx, LDB_ERR_UNWILLING_TO_PERFORM, &errstr);
+               map_ldb_error(local_ctx, LDB_ERR_UNWILLING_TO_PERFORM, NULL,
+                             &errstr);
                errstr = talloc_asprintf(local_ctx,
                        "%s. Old RDN must be deleted", errstr);
                goto reply;
@@ -767,7 +966,7 @@ static NTSTATUS ldapsrv_ModifyDNRequest(struct ldapsrv_call *call)
                if (ldb_dn_get_comp_num(parentdn) < 1) {
                        result = LDAP_AFFECTS_MULTIPLE_DSAS;
                        map_ldb_error(local_ctx, LDB_ERR_AFFECTS_MULTIPLE_DSAS,
-                               &errstr);
+                                     NULL, &errstr);
                        errstr = talloc_asprintf(local_ctx,
                                "%s. Error new Superior DN invalid", errstr);
                        goto reply;
@@ -779,10 +978,7 @@ static NTSTATUS ldapsrv_ModifyDNRequest(struct ldapsrv_call *call)
                NT_STATUS_HAVE_NO_MEMORY(parentdn);
        }
 
-       if ( ! ldb_dn_add_child_fmt(parentdn,
-                               "%s=%s",
-                               ldb_dn_get_rdn_name(newrdn),
-                               (char *)ldb_dn_get_rdn_val(newrdn)->data)) {
+       if ( ! ldb_dn_add_child(parentdn, newrdn)) {
                result = LDAP_OTHER;
                goto reply;
        }
@@ -793,15 +989,26 @@ reply:
        NT_STATUS_HAVE_NO_MEMORY(modifydn_r);
 
        if (result == LDAP_SUCCESS) {
-               ldb_ret = ldb_rename(samdb, olddn, newdn);
-               result = map_ldb_error(local_ctx, ldb_ret, &errstr);
+               res = talloc_zero(local_ctx, struct ldb_result);
+               NT_STATUS_HAVE_NO_MEMORY(res);
+               ldb_ret = ldb_rename_with_context(samdb, olddn, newdn, res);
+               result = map_ldb_error(local_ctx, ldb_ret, ldb_errstring(samdb),
+                                      &errstr);
        }
 
        modifydn = &modifydn_r->msg->r.ModifyDNResponse;
        modifydn->dn = NULL;
-       modifydn->resultcode = result;
-       modifydn->errormessage = (errstr?talloc_strdup(modifydn_r,errstr):NULL);
-       modifydn->referral = NULL;
+       if (res->refs != NULL) {
+               modifydn->resultcode = map_ldb_error(local_ctx,
+                                                    LDB_ERR_REFERRAL, NULL,
+                                                    &errstr);;
+               modifydn->errormessage = (errstr?talloc_strdup(modifydn_r,errstr):NULL);
+               modifydn->referral = talloc_strdup(call, *res->refs);
+       } else {
+               modifydn->resultcode = result;
+               modifydn->errormessage = (errstr?talloc_strdup(modifydn_r,errstr):NULL);
+               modifydn->referral = NULL;
+       }
 
        talloc_free(local_ctx);
 
@@ -850,7 +1057,8 @@ reply:
                ldb_ret = ldb_search(samdb, local_ctx, &res,
                                     dn, LDB_SCOPE_BASE, attrs, "%s", filter);
                if (ldb_ret != LDB_SUCCESS) {
-                       result = map_ldb_error(local_ctx, ldb_ret, &errstr);
+                       result = map_ldb_error(local_ctx, ldb_ret,
+                                              ldb_errstring(samdb), &errstr);
                        DEBUG(10,("CompareRequest: error: %s\n", errstr));
                } else if (res->count == 0) {
                        DEBUG(10,("CompareRequest: doesn't matched\n"));
@@ -862,7 +1070,7 @@ reply:
                        errstr = NULL;
                } else if (res->count > 1) {
                        result = LDAP_OTHER;
-                       map_ldb_error(local_ctx, LDB_ERR_OTHER, &errstr);
+                       map_ldb_error(local_ctx, LDB_ERR_OTHER, NULL, &errstr);
                        errstr = talloc_asprintf(local_ctx,
                                "%s. Too many objects match!", errstr);
                        DEBUG(10,("CompareRequest: %d results: %s\n", res->count, errstr));
@@ -890,7 +1098,7 @@ static NTSTATUS ldapsrv_AbandonRequest(struct ldapsrv_call *call)
 
 NTSTATUS ldapsrv_do_call(struct ldapsrv_call *call)
 {
-       int i;
+       unsigned int i;
        struct ldap_message *msg = call->request;
        /* Check for undecoded critical extensions */
        for (i=0; msg->controls && msg->controls[i]; i++) {