/* 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 "smbd/service_stream.h" #include "lib/tsocket/tsocket.h" #include "ntvfs/ntvfs.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, 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); }