source/libnet/libnet_lookup.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Rafal Szczesniak 2005
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 /*
  22   a composite function for name resolving
  23 */
  24
  25 #include "includes.h"
  26 #include "lib/events/events.h"
  27 #include "libnet/libnet.h"
  28 #include "libcli/composite/composite.h"
  29 #include "auth/credentials/credentials.h"
  30 #include "lib/messaging/messaging.h"
  31 #include "lib/messaging/irpc.h"
  32 #include "libcli/resolve/resolve.h"
  33 #include "libcli/finddcs.h"
  34 #include "libcli/security/security.h"
  35 #include "librpc/gen_ndr/lsa.h"
  36 #include "librpc/gen_ndr/ndr_lsa_c.h"
  37
  38 struct lookup_state {
  39         struct nbt_name hostname;
  40         const char *address;
  41 };
  42
  43
  44 static void continue_name_resolved(struct composite_context *ctx);
  45
  46
  47 /**
  48  * Sends asynchronous Lookup request
  49  *
  50  * @param io arguments and result of the call
  51  */
  52
  53 struct composite_context *libnet_Lookup_send(struct libnet_context *ctx,
  54                                              struct libnet_Lookup *io)
  55 {
  56         struct composite_context *c;
  57         struct lookup_state *s;
  58         struct composite_context *cresolve_req;
  59         const char** methods;
  60
  61         /* allocate context and state structures */
  62         c = composite_create(ctx, ctx->event_ctx);
  63         if (c == NULL) return NULL;
  64
  65         s = talloc_zero(c, struct lookup_state);
  66         if (composite_nomem(s, c)) return c;
  67
  68         c->private_data = s;
  69
  70         if (io == NULL || io->in.hostname == NULL) {
  71                 composite_error(c, NT_STATUS_INVALID_PARAMETER);
  72                 return c;
  73         }
  74
  75         /* parameters */
  76         s->hostname.name   = talloc_strdup(s, io->in.hostname);
  77         if (composite_nomem(s->hostname.name, c)) return c;
  78
  79         s->hostname.type   = io->in.type;
  80         s->hostname.scope  = NULL;
  81
  82         /* name resolution methods */
  83         if (io->in.methods) {
  84                 methods = io->in.methods;
  85         } else {
  86                 methods = ctx->name_res_methods;
  87         }
  88
  89         /* send resolve request */
  90         cresolve_req = resolve_name_send(&s->hostname, c->event_ctx, methods);
  91         if (composite_nomem(cresolve_req, c)) return c;
  92
  93         composite_continue(c, cresolve_req, continue_name_resolved, c);
  94         return c;
  95 }
  96
  97
  98 static void continue_name_resolved(struct composite_context *ctx)
  99 {
 100         struct composite_context *c;
 101         struct lookup_state *s;
 102
 103         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 104         s = talloc_get_type(c->private_data, struct lookup_state);
 105
 106         c->status = resolve_name_recv(ctx, s, &s->address);
 107
 108         composite_done(c);
 109 }
 110
 111
 112 /**
 113  * Waits for and receives results of asynchronous Lookup call
 114  *
 115  * @param c composite context returned by asynchronous Lookup call
 116  * @param mem_ctx memory context of the call
 117  * @param io pointer to results (and arguments) of the call
 118  * @return nt status code of execution
 119  */
 120
 121 NTSTATUS libnet_Lookup_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 122                             struct libnet_Lookup *io)
 123 {
 124         NTSTATUS status;
 125         struct lookup_state *s;
 126
 127         status = composite_wait(c);
 128         if (NT_STATUS_IS_OK(status)) {
 129                 s = talloc_get_type(c->private_data, struct lookup_state);
 130
 131                 io->out.address = str_list_make(mem_ctx, s->address, NULL);
 132                 NT_STATUS_HAVE_NO_MEMORY(io->out.address);
 133         }
 134
 135         talloc_free(c);
 136         return status;
 137 }
 138
 139
 140 /**
 141  * Synchronous version of Lookup call
 142  *
 143  * @param mem_ctx memory context for the call
 144  * @param io arguments and results of the call
 145  * @return nt status code of execution
 146  */
 147
 148 NTSTATUS libnet_Lookup(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 149                        struct libnet_Lookup *io)
 150 {
 151         struct composite_context *c = libnet_Lookup_send(ctx, io);
 152         return libnet_Lookup_recv(c, mem_ctx, io);
 153 }
 154
 155
 156 /*
 157  * Shortcut functions to find common types of name
 158  * (and skip nbt name type argument)
 159  */
 160
 161
 162 /**
 163  * Sends asynchronous LookupHost request
 164  */
 165 struct composite_context* libnet_LookupHost_send(struct libnet_context *ctx,
 166                                                  struct libnet_Lookup *io)
 167 {
 168         io->in.type = NBT_NAME_SERVER;
 169         return libnet_Lookup_send(ctx, io);
 170 }
 171
 172
 173
 174 /**
 175  * Synchronous version of LookupHost call
 176  */
 177 NTSTATUS libnet_LookupHost(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 178                            struct libnet_Lookup *io)
 179 {
 180         struct composite_context *c = libnet_LookupHost_send(ctx, io);
 181         return libnet_Lookup_recv(c, mem_ctx, io);
 182 }
 183
 184
 185 /**
 186  * Sends asynchronous LookupDCs request
 187  */
 188 struct composite_context* libnet_LookupDCs_send(struct libnet_context *ctx,
 189                                                 TALLOC_CTX *mem_ctx,
 190                                                 struct libnet_LookupDCs *io)
 191 {
 192         struct composite_context *c;
 193         struct messaging_context *msg_ctx = messaging_client_init(mem_ctx, ctx->event_ctx);
 194
 195         c = finddcs_send(mem_ctx, io->in.domain_name, io->in.name_type,
 196                          NULL, ctx->name_res_methods, ctx->event_ctx, msg_ctx);
 197         return c;
 198 }
 199
 200 /**
 201  * Waits for and receives results of asynchronous Lookup call
 202  *
 203  * @param c composite context returned by asynchronous Lookup call
 204  * @param mem_ctx memory context of the call
 205  * @param io pointer to results (and arguments) of the call
 206  * @return nt status code of execution
 207  */
 208
 209 NTSTATUS libnet_LookupDCs_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 210                                struct libnet_LookupDCs *io)
 211 {
 212         NTSTATUS status;
 213         status = finddcs_recv(c, mem_ctx, &io->out.num_dcs, &io->out.dcs);
 214         if (!NT_STATUS_IS_OK(status)) {
 215                 return status;
 216         }
 217         return status;
 218 }
 219
 220
 221 /**
 222  * Synchronous version of LookupDCs
 223  */
 224 NTSTATUS libnet_LookupDCs(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 225                           struct libnet_LookupDCs *io)
 226 {
 227         struct composite_context *c = libnet_LookupDCs_send(ctx, mem_ctx, io);
 228         return libnet_LookupDCs_recv(c, mem_ctx, io);
 229 }
 230
 231
 232 struct lookup_name_state {
 233         struct libnet_context *ctx;
 234         const char *name;
 235         uint32_t count;
 236         struct libnet_DomainOpen domopen;
 237         struct lsa_LookupNames lookup;
 238         struct lsa_TransSidArray sids;
 239         struct lsa_String *names;
 240
 241         /* information about the progress */
 242         void (*monitor_fn)(struct monitor_msg *);
 243 };
 244
 245
 246 static bool prepare_lookup_params(struct libnet_context *ctx,
 247                                   struct composite_context *c,
 248                                   struct lookup_name_state *s);
 249 static void continue_lookup_name(struct composite_context *ctx);
 250 static void continue_name_found(struct rpc_request *req);
 251
 252
 253 struct composite_context* libnet_LookupName_send(struct libnet_context *ctx,
 254                                                  TALLOC_CTX *mem_ctx,
 255                                                  struct libnet_LookupName *io,
 256                                                  void (*monitor)(struct monitor_msg*))
 257 {
 258         struct composite_context *c;
 259         struct lookup_name_state *s;
 260         struct rpc_request *lookup_req;
 261         BOOL prereq_met = False;
 262
 263         c = composite_create(mem_ctx, ctx->event_ctx);
 264         if (c == NULL) return NULL;
 265
 266         s = talloc_zero(c, struct lookup_name_state);
 267         if (composite_nomem(s, c)) return c;
 268
 269         c->private_data = s;
 270
 271         s->name = talloc_strdup(c, io->in.name);
 272         s->monitor_fn = monitor;
 273         s->ctx = ctx;
 274
 275         prereq_met = lsa_domain_opened(ctx, io->in.domain_name, &c, &s->domopen,
 276                                        continue_lookup_name, monitor);
 277         if (!prereq_met) return c;
 278
 279         if (!prepare_lookup_params(ctx, c, s)) return c;
 280
 281         lookup_req = dcerpc_lsa_LookupNames_send(ctx->lsa.pipe, c, &s->lookup);
 282         if (composite_nomem(lookup_req, c)) return c;
 283
 284         composite_continue_rpc(c, lookup_req, continue_name_found, c);
 285         return c;
 286 }
 287
 288
 289 static bool prepare_lookup_params(struct libnet_context *ctx,
 290                                   struct composite_context *c,
 291                                   struct lookup_name_state *s)
 292 {
 293         const int single_name = 1;
 294
 295         s->sids.count = 0;
 296         s->sids.sids  = NULL;
 297
 298         s->names = talloc_array(ctx, struct lsa_String, single_name);
 299         if (composite_nomem(s->names, c)) return false;
 300         s->names[0].string = s->name;
 301
 302         s->lookup.in.handle    = &ctx->lsa.handle;
 303         s->lookup.in.num_names = single_name;
 304         s->lookup.in.names     = s->names;
 305         s->lookup.in.sids      = &s->sids;
 306         s->lookup.in.level     = 1;
 307         s->lookup.in.count     = &s->count;
 308         s->lookup.out.count    = &s->count;
 309         s->lookup.out.sids     = &s->sids;
 310
 311         return true;
 312 }
 313
 314
 315 static void continue_lookup_name(struct composite_context *ctx)
 316 {
 317         struct composite_context *c;
 318         struct lookup_name_state *s;
 319         struct rpc_request *lookup_req;
 320
 321         c = talloc_get_type(ctx->async.private_data, struct composite_context);
 322         s = talloc_get_type(c->private_data, struct lookup_name_state);
 323
 324         c->status = libnet_DomainOpen_recv(ctx, s->ctx, c, &s->domopen);
 325         if (!composite_is_ok(c)) return;
 326
 327         if (!prepare_lookup_params(s->ctx, c, s)) return;
 328
 329         lookup_req = dcerpc_lsa_LookupNames_send(s->ctx->lsa.pipe, c, &s->lookup);
 330         if (composite_nomem(lookup_req, c)) return;
 331
 332         composite_continue_rpc(c, lookup_req, continue_name_found, c);
 333 }
 334
 335
 336 static void continue_name_found(struct rpc_request *req)
 337 {
 338         struct composite_context *c;
 339         struct lookup_name_state *s;
 340
 341         c = talloc_get_type(req->async.private_data, struct composite_context);
 342         s = talloc_get_type(c->private_data, struct lookup_name_state);
 343
 344         c->status = dcerpc_ndr_request_recv(req);
 345         if (!composite_is_ok(c)) return;
 346
 347         c->status = s->lookup.out.result;
 348         if (!composite_is_ok(c)) return;
 349
 350         composite_done(c);
 351 }
 352
 353
 354 NTSTATUS libnet_LookupName_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
 355                                 struct libnet_LookupName *io)
 356 {
 357         NTSTATUS status;
 358         struct lookup_name_state *s;
 359
 360         status = composite_wait(c);
 361
 362         if (NT_STATUS_IS_OK(status)) {
 363                 s = talloc_get_type(c->private_data, struct lookup_name_state);
 364
 365                 io->out.rid = 0;
 366                 io->out.sid = NULL;
 367                 io->out.sidstr = NULL;
 368
 369                 if (*s->lookup.out.count > 0) {
 370                         struct lsa_RefDomainList *domains = s->lookup.out.domains;
 371                         struct lsa_TransSidArray *sids = s->lookup.out.sids;
 372
 373                         if (domains == NULL || sids == NULL) {
 374                                 status = NT_STATUS_UNSUCCESSFUL;
 375                                 io->out.error_string = talloc_asprintf(mem_ctx, "Error: %s", nt_errstr(status));
 376                                 goto done;
 377                         }
 378
 379                         if (sids->count > 0) {
 380                                 io->out.rid        = sids->sids[0].rid;
 381                                 io->out.sid_type   = sids->sids[0].sid_type;
 382                                 if (domains->count > 0) {
 383                                         io->out.sid = dom_sid_add_rid(mem_ctx, domains->domains[0].sid, io->out.rid);
 384                                         NT_STATUS_HAVE_NO_MEMORY(io->out.sid);
 385                                         io->out.sidstr = dom_sid_string(mem_ctx, io->out.sid);
 386                                         NT_STATUS_HAVE_NO_MEMORY(io->out.sidstr);
 387                                 }
 388                         }
 389                 }
 390
 391                 io->out.error_string = talloc_strdup(mem_ctx, "Success");
 392
 393         } else if (!NT_STATUS_IS_OK(status)) {
 394                 io->out.error_string = talloc_asprintf(mem_ctx, "Error: %s", nt_errstr(status));
 395         }
 396
 397 done:
 398         talloc_free(c);
 399         return status;
 400 }
 401
 402
 403 NTSTATUS libnet_LookupName(struct libnet_context *ctx, TALLOC_CTX *mem_ctx,
 404                            struct libnet_LookupName *io)
 405 {
 406         struct composite_context *c;
 407
 408         c = libnet_LookupName_send(ctx, mem_ctx, io, NULL);
 409         return libnet_LookupName_recv(c, mem_ctx, io);
 410 }