2 Unix SMB/Netbios implementation.
3 SMB client library implementation
4 Copyright (C) Andrew Tridgell 1998
5 Copyright (C) Richard Sharpe 2000, 2002
6 Copyright (C) John Terpstra 2000
7 Copyright (C) Tom Jansen (Ninja ISD) 2002
8 Copyright (C) Derrell Lipman 2003-2008
9 Copyright (C) Jeremy Allison 2007, 2008
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>.
26 #include "libsmbclient.h"
27 #include "libsmb_internal.h"
31 * Check a server for being alive and well.
32 * returns 0 if the server is in shape. Returns 1 on error
34 * Also useable outside libsmbclient to enable external cache
35 * to do some checks too.
38 SMBC_check_server(SMBCCTX * context,
45 return (getpeername(server->cli->fd, &addr, &size) == -1);
49 * Remove a server from the cached server list it's unused.
50 * On success, 0 is returned. 1 is returned if the server could not be removed.
52 * Also useable outside libsmbclient
55 SMBC_remove_unused_server(SMBCCTX * context,
60 /* are we being fooled ? */
61 if (!context || !context->internal->initialized || !srv) {
65 /* Check all open files/directories for a relation with this server */
66 for (file = context->internal->files; file; file = file->next) {
67 if (file->srv == srv) {
69 DEBUG(3, ("smbc_remove_usused_server: "
70 "%p still used by %p.\n",
76 DLIST_REMOVE(context->internal->servers, srv);
78 cli_shutdown(srv->cli);
81 DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
83 smbc_getFunctionRemoveCachedServer(context)(context, srv);
89 /****************************************************************
90 * Call the auth_fn with fixed size (fstring) buffers.
91 ***************************************************************/
93 SMBC_call_auth_fn(TALLOC_CTX *ctx,
104 smbc_get_auth_data_with_context_fn auth_with_context_fn;
106 strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
107 strlcpy(username, *pp_username, sizeof(username));
108 strlcpy(password, *pp_password, sizeof(password));
110 /* See if there's an authentication with context function provided */
111 auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
112 if (auth_with_context_fn)
114 (* auth_with_context_fn)(context,
116 workgroup, sizeof(workgroup),
117 username, sizeof(username),
118 password, sizeof(password));
122 smbc_getFunctionAuthData(context)(server, share,
123 workgroup, sizeof(workgroup),
124 username, sizeof(username),
125 password, sizeof(password));
128 TALLOC_FREE(*pp_workgroup);
129 TALLOC_FREE(*pp_username);
130 TALLOC_FREE(*pp_password);
132 *pp_workgroup = talloc_strdup(ctx, workgroup);
133 *pp_username = talloc_strdup(ctx, username);
134 *pp_password = talloc_strdup(ctx, password);
139 SMBC_get_auth_data(const char *server, const char *share,
140 char *workgroup_buf, int workgroup_buf_len,
141 char *username_buf, int username_buf_len,
142 char *password_buf, int password_buf_len)
144 /* Default function just uses provided data. Nothing to do. */
150 SMBC_find_server(TALLOC_CTX *ctx,
161 if (!pp_workgroup || !pp_username || !pp_password) {
167 srv = smbc_getFunctionGetCachedServer(context)(context,
172 if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
173 !*pp_password || !(*pp_password)[0])) {
174 SMBC_call_auth_fn(ctx, context, server, share,
175 pp_workgroup, pp_username, pp_password);
178 * However, smbc_auth_fn may have picked up info relating to
179 * an existing connection, so try for an existing connection
183 goto check_server_cache;
188 if (smbc_getFunctionCheckServer(context)(context, srv)) {
190 * This server is no good anymore
191 * Try to remove it and check for more possible
192 * servers in the cache
194 if (smbc_getFunctionRemoveUnusedServer(context)(context,
197 * We could not remove the server completely,
198 * remove it from the cache so we will not get
199 * it again. It will be removed when the last
200 * file/dir is closed.
202 smbc_getFunctionRemoveCachedServer(context)(context,
207 * Maybe there are more cached connections to this
210 goto check_server_cache;
220 * Connect to a server, possibly on an existing connection
222 * Here, what we want to do is: If the server and username
223 * match an existing connection, reuse that, otherwise, establish a
226 * If we have to create a new connection, call the auth_fn to get the
227 * info we need, unless the username and password were passed in.
231 SMBC_server(TALLOC_CTX *ctx,
233 bool connect_if_not_found,
242 struct nmb_name called, calling;
243 const char *server_n = server;
244 struct sockaddr_storage ss;
245 int tried_reverse = 0;
248 const char *username_used;
254 if (server[0] == 0) {
259 /* Look for a cached connection */
260 srv = SMBC_find_server(ctx, context, server, share,
261 pp_workgroup, pp_username, pp_password);
264 * If we found a connection and we're only allowed one share per
269 smbc_getOptionOneSharePerServer(context)) {
272 * ... then if there's no current connection to the share,
273 * connect to it. SMBC_find_server(), or rather the function
274 * pointed to by context->get_cached_srv_fn which
275 * was called by SMBC_find_server(), will have issued a tree
276 * disconnect if the requested share is not the same as the
277 * one that was already connected.
279 if (srv->cli->cnum == (uint16) -1) {
280 /* Ensure we have accurate auth info */
281 SMBC_call_auth_fn(ctx, context, server, share,
286 if (!*pp_workgroup || !*pp_username || !*pp_password) {
288 cli_shutdown(srv->cli);
290 smbc_getFunctionRemoveCachedServer(context)(context,
296 * We don't need to renegotiate encryption
297 * here as the encryption context is not per
301 if (!cli_send_tconX(srv->cli, share, "?????",
303 strlen(*pp_password)+1)) {
305 errno = SMBC_errno(context, srv->cli);
306 cli_shutdown(srv->cli);
308 smbc_getFunctionRemoveCachedServer(context)(context,
314 * Regenerate the dev value since it's based on both
318 srv->dev = (dev_t)(str_checksum(server) ^
319 str_checksum(share));
324 /* If we have a connection... */
327 /* ... then we're done here. Give 'em what they came for. */
331 /* If we're not asked to connect when a connection doesn't exist... */
332 if (! connect_if_not_found) {
333 /* ... then we're done here. */
337 if (!*pp_workgroup || !*pp_username || !*pp_password) {
342 make_nmb_name(&calling, smbc_getNetbiosName(context), 0x0);
343 make_nmb_name(&called , server, 0x20);
345 DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
347 DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
353 /* have to open a new connection */
354 if ((c = cli_initialise()) == NULL) {
359 if (smbc_getOptionUseKerberos(context)) {
360 c->use_kerberos = True;
363 if (smbc_getOptionFallbackAfterKerberos(context)) {
364 c->fallback_after_kerberos = True;
367 c->timeout = smbc_getTimeout(context);
370 * Force use of port 139 for first try if share is $IPC, empty, or
371 * null, so browse lists can work
373 if (share == NULL || *share == '\0' || strcmp(share, "IPC$") == 0) {
374 port_try_first = 139;
377 port_try_first = 445;
381 c->port = port_try_first;
383 status = cli_connect(c, server_n, &ss);
384 if (!NT_STATUS_IS_OK(status)) {
386 /* First connection attempt failed. Try alternate port. */
387 c->port = port_try_next;
389 status = cli_connect(c, server_n, &ss);
390 if (!NT_STATUS_IS_OK(status)) {
397 if (!cli_session_request(c, &calling, &called)) {
399 if (strcmp(called.name, "*SMBSERVER")) {
400 make_nmb_name(&called , "*SMBSERVER", 0x20);
402 } else { /* Try one more time, but ensure we don't loop */
404 /* Only try this if server is an IP address ... */
406 if (is_ipaddress(server) && !tried_reverse) {
408 struct sockaddr_storage rem_ss;
410 if (!interpret_string_addr(&rem_ss, server,
412 DEBUG(4, ("Could not convert IP address "
413 "%s to struct sockaddr_storage\n",
419 tried_reverse++; /* Yuck */
421 if (name_status_find("*", 0, 0,
422 &rem_ss, remote_name)) {
423 make_nmb_name(&called,
434 DEBUG(4,(" session request ok\n"));
436 if (!cli_negprot(c)) {
442 username_used = *pp_username;
444 if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
446 strlen(*pp_password),
448 strlen(*pp_password),
451 /* Failed. Try an anonymous login, if allowed by flags. */
454 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
455 !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
466 DEBUG(4,(" session setup ok\n"));
468 if (!cli_send_tconX(c, share, "?????",
469 *pp_password, strlen(*pp_password)+1)) {
470 errno = SMBC_errno(context, c);
475 DEBUG(4,(" tconx ok\n"));
477 if (context->internal->smb_encryption_level) {
478 /* Attempt UNIX smb encryption. */
479 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
485 * context->smb_encryption_level == 1
486 * means don't fail if encryption can't be negotiated,
487 * == 2 means fail if encryption can't be negotiated.
490 DEBUG(4,(" SMB encrypt failed\n"));
492 if (context->internal->smb_encryption_level == 2) {
498 DEBUG(4,(" SMB encrypt ok\n"));
502 * Ok, we have got a nice connection
503 * Let's allocate a server structure.
506 srv = SMB_MALLOC_P(SMBCSRV);
514 srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
515 srv->no_pathinfo = False;
516 srv->no_pathinfo2 = False;
517 srv->no_nt_session = False;
519 /* now add it to the cache (internal or external) */
520 /* Let the cache function set errno if it wants to */
522 if (smbc_getFunctionAddCachedServer(context)(context, srv,
526 int saved_errno = errno;
527 DEBUG(3, (" Failed to add server to cache\n"));
535 DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
536 server, share, srv));
538 DLIST_ADD(context->internal->servers, srv);
552 * Connect to a server for getting/setting attributes, possibly on an existing
553 * connection. This works similarly to SMBC_server().
556 SMBC_attr_server(TALLOC_CTX *ctx,
565 struct sockaddr_storage ss;
566 struct cli_state *ipc_cli;
567 struct rpc_pipe_client *pipe_hnd;
569 SMBCSRV *ipc_srv=NULL;
572 * See if we've already created this special connection. Reference
573 * our "special" share name '*IPC$', which is an impossible real share
574 * name due to the leading asterisk.
576 ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
577 pp_workgroup, pp_username, pp_password);
580 /* We didn't find a cached connection. Get the password */
581 if (!*pp_password || (*pp_password)[0] == '\0') {
582 /* ... then retrieve it now. */
583 SMBC_call_auth_fn(ctx, context, server, share,
587 if (!*pp_workgroup || !*pp_username || !*pp_password) {
594 if (smbc_getOptionUseKerberos(context)) {
595 flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
599 nt_status = cli_full_connection(&ipc_cli,
600 global_myname(), server,
601 &ss, 0, "IPC$", "?????",
607 if (! NT_STATUS_IS_OK(nt_status)) {
608 DEBUG(1,("cli_full_connection failed! (%s)\n",
609 nt_errstr(nt_status)));
614 if (context->internal->smb_encryption_level) {
615 /* Attempt UNIX smb encryption. */
616 if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
622 * context->smb_encryption_level ==
623 * 1 means don't fail if encryption can't be
624 * negotiated, == 2 means fail if encryption
625 * can't be negotiated.
628 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
630 if (context->internal->smb_encryption_level == 2) {
631 cli_shutdown(ipc_cli);
636 DEBUG(4,(" SMB encrypt ok on IPC$\n"));
639 ipc_srv = SMB_MALLOC_P(SMBCSRV);
642 cli_shutdown(ipc_cli);
646 ZERO_STRUCTP(ipc_srv);
647 ipc_srv->cli = ipc_cli;
649 nt_status = cli_rpc_pipe_open_noauth(
650 ipc_srv->cli, &ndr_table_lsarpc.syntax_id, &pipe_hnd);
651 if (!NT_STATUS_IS_OK(nt_status)) {
652 DEBUG(1, ("cli_nt_session_open fail!\n"));
654 cli_shutdown(ipc_srv->cli);
660 * Some systems don't support
661 * SEC_RIGHTS_MAXIMUM_ALLOWED, but NT sends 0x2000000
662 * so we might as well do it too.
665 nt_status = rpccli_lsa_open_policy(
669 GENERIC_EXECUTE_ACCESS,
672 if (!NT_STATUS_IS_OK(nt_status)) {
673 errno = SMBC_errno(context, ipc_srv->cli);
674 cli_shutdown(ipc_srv->cli);
678 /* now add it to the cache (internal or external) */
680 errno = 0; /* let cache function set errno if it likes */
681 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
686 DEBUG(3, (" Failed to add server to cache\n"));
690 cli_shutdown(ipc_srv->cli);
695 DLIST_ADD(context->internal->servers, ipc_srv);