diff options
Diffstat (limited to 'source4/smb_server/tcon.c')
| -rw-r--r-- | source4/smb_server/tcon.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/source4/smb_server/tcon.c b/source4/smb_server/tcon.c new file mode 100644 index 0000000..04dc7fe --- /dev/null +++ b/source4/smb_server/tcon.c @@ -0,0 +1,196 @@ +/* + Unix SMB/CIFS implementation. + Manage smbsrv_tcon structures + Copyright (C) Andrew Tridgell 1998 + Copyright (C) Alexander Bokovoy 2002 + Copyright (C) Stefan Metzmacher 2005-2006 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" +#include "smb_server/smb_server.h" +#include "samba/service_stream.h" +#include "lib/tsocket/tsocket.h" +#include "ntvfs/ntvfs.h" +#include "lib/util/idtree_random.h" + +/**************************************************************************** +init the tcon structures +****************************************************************************/ +static NTSTATUS smbsrv_init_tcons(struct smbsrv_tcons_context *tcons_ctx, TALLOC_CTX *mem_ctx, uint32_t limit) +{ + /* + * the idr_* functions take 'int' as limit, + * and only work with a max limit 0x00FFFFFF + */ + limit &= 0x00FFFFFF; + + tcons_ctx->idtree_tid = idr_init(mem_ctx); + NT_STATUS_HAVE_NO_MEMORY(tcons_ctx->idtree_tid); + tcons_ctx->idtree_limit = limit; + tcons_ctx->list = NULL; + + return NT_STATUS_OK; +} + +NTSTATUS smbsrv_smb_init_tcons(struct smbsrv_connection *smb_conn) +{ + return smbsrv_init_tcons(&smb_conn->smb_tcons, smb_conn, UINT16_MAX); +} + +NTSTATUS smbsrv_smb2_init_tcons(struct smbsrv_session *smb_sess) +{ + return smbsrv_init_tcons(&smb_sess->smb2_tcons, smb_sess, UINT32_MAX); +} + +/**************************************************************************** +find a tcon given a tid for SMB +****************************************************************************/ +static struct smbsrv_tcon *smbsrv_tcon_find(struct smbsrv_tcons_context *tcons_ctx, + uint32_t tid, struct timeval request_time) +{ + void *p; + struct smbsrv_tcon *tcon; + + if (tid == 0) return NULL; + + if (tid > tcons_ctx->idtree_limit) return NULL; + + p = idr_find(tcons_ctx->idtree_tid, tid); + if (!p) return NULL; + + tcon = talloc_get_type(p, struct smbsrv_tcon); + if (!tcon) return NULL; + + tcon->statistics.last_request_time = request_time; + + return tcon; +} + +struct smbsrv_tcon *smbsrv_smb_tcon_find(struct smbsrv_connection *smb_conn, + uint32_t tid, struct timeval request_time) +{ + return smbsrv_tcon_find(&smb_conn->smb_tcons, tid, request_time); +} + +struct smbsrv_tcon *smbsrv_smb2_tcon_find(struct smbsrv_session *smb_sess, + uint32_t tid, struct timeval request_time) +{ + if (!smb_sess) return NULL; + return smbsrv_tcon_find(&smb_sess->smb2_tcons, tid, request_time); +} + +/* + destroy a connection structure +*/ +static int smbsrv_tcon_destructor(struct smbsrv_tcon *tcon) +{ + struct smbsrv_tcons_context *tcons_ctx; + struct tsocket_address *client_addr; + + client_addr = tcon->smb_conn->connection->remote_address; + + DEBUG(3,("%s closed connection to service %s\n", + tsocket_address_string(client_addr, tcon), + tcon->share_name)); + + /* tell the ntvfs backend that we are disconnecting */ + if (tcon->ntvfs) { + ntvfs_disconnect(tcon->ntvfs); + tcon->ntvfs = NULL; + } + + if (tcon->smb2.session) { + tcons_ctx = &tcon->smb2.session->smb2_tcons; + } else { + tcons_ctx = &tcon->smb_conn->smb_tcons; + } + + idr_remove(tcons_ctx->idtree_tid, tcon->tid); + DLIST_REMOVE(tcons_ctx->list, tcon); + return 0; +} + +/* + find first available connection slot +*/ +static struct smbsrv_tcon *smbsrv_tcon_new(struct smbsrv_connection *smb_conn, + struct smbsrv_session *smb_sess, + const char *share_name) +{ + TALLOC_CTX *mem_ctx; + struct smbsrv_tcons_context *tcons_ctx; + uint32_t handle_uint_max; + struct smbsrv_tcon *tcon; + NTSTATUS status; + int i; + + if (smb_sess) { + mem_ctx = smb_sess; + tcons_ctx = &smb_sess->smb2_tcons; + handle_uint_max = UINT32_MAX; + } else { + mem_ctx = smb_conn; + tcons_ctx = &smb_conn->smb_tcons; + handle_uint_max = UINT16_MAX; + } + + tcon = talloc_zero(mem_ctx, struct smbsrv_tcon); + if (!tcon) return NULL; + tcon->smb_conn = smb_conn; + tcon->smb2.session = smb_sess; + tcon->share_name = talloc_strdup(tcon, share_name); + if (!tcon->share_name) goto failed; + + /* + * the use -1 here, because we don't want to give away the wildcard + * fnum used in SMBflush + */ + status = smbsrv_init_handles(tcon, handle_uint_max - 1); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(1,("ERROR! failed to init handles: %s\n", nt_errstr(status))); + goto failed; + } + + i = idr_get_new_random( + tcons_ctx->idtree_tid, tcon, 1, tcons_ctx->idtree_limit); + if (i == -1) { + DEBUG(1,("ERROR! Out of connection structures\n")); + goto failed; + } + tcon->tid = i; + + DLIST_ADD(tcons_ctx->list, tcon); + talloc_set_destructor(tcon, smbsrv_tcon_destructor); + + /* now fill in some statistics */ + tcon->statistics.connect_time = timeval_current(); + + return tcon; + +failed: + talloc_free(tcon); + return NULL; +} + +struct smbsrv_tcon *smbsrv_smb_tcon_new(struct smbsrv_connection *smb_conn, const char *share_name) +{ + return smbsrv_tcon_new(smb_conn, NULL, share_name); +} + +struct smbsrv_tcon *smbsrv_smb2_tcon_new(struct smbsrv_session *smb_sess, const char *share_name) +{ + return smbsrv_tcon_new(smb_sess->smb_conn, smb_sess, share_name); +} |