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Unix SMB/CIFS implementation.
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SMB client generic functions
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Copyright (C) Andrew Tridgell 1994-1998
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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/****************************************************************************
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Change the timeout (in milliseconds).
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****************************************************************************/
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unsigned int cli_set_timeout(struct cli_state *cli, unsigned int timeout)
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unsigned int old_timeout = cli->timeout;
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cli->timeout = timeout;
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/****************************************************************************
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Change the port number used to call on.
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****************************************************************************/
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int cli_set_port(struct cli_state *cli, int port)
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/****************************************************************************
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Read an smb from a fd ignoring all keepalive packets. Note that the buffer
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*MUST* be of size BUFFER_SIZE+SAFETY_MARGIN.
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The timeout is in milliseconds
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This is exactly the same as receive_smb except that it never returns
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a session keepalive packet (just as receive_smb used to do).
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receive_smb was changed to return keepalives as the oplock processing means this call
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should never go into a blocking read.
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****************************************************************************/
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static BOOL client_receive_smb(int fd,char *buffer, unsigned int timeout)
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ret = receive_smb_raw(fd, buffer, timeout);
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DEBUG(10,("client_receive_smb failed\n"));
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/* Ignore session keepalive packets. */
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if(CVAL(buffer,0) != SMBkeepalive)
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/****************************************************************************
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****************************************************************************/
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BOOL cli_receive_smb(struct cli_state *cli)
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extern int smb_read_error;
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/* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
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ret = client_receive_smb(cli->fd,cli->inbuf,cli->timeout);
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/* it might be an oplock break request */
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if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
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CVAL(cli->inbuf,smb_com) == SMBlockingX &&
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SVAL(cli->inbuf,smb_vwv6) == 0 &&
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SVAL(cli->inbuf,smb_vwv7) == 0) {
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if (cli->oplock_handler) {
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int fnum = SVAL(cli->inbuf,smb_vwv2);
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unsigned char level = CVAL(cli->inbuf,smb_vwv3+1);
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if (!cli->oplock_handler(cli, fnum, level)) return False;
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/* try to prevent loops */
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SCVAL(cli->inbuf,smb_com,0xFF);
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/* If the server is not responding, note that now */
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cli->smb_rw_error = smb_read_error;
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if (!cli_check_sign_mac(cli)) {
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DEBUG(0, ("SMB Signature verification failed on incoming packet!\n"));
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cli->smb_rw_error = READ_BAD_SIG;
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static ssize_t write_socket(int fd, const char *buf, size_t len)
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DEBUG(6,("write_socket(%d,%d)\n",fd,(int)len));
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ret = write_data(fd,buf,len);
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DEBUG(6,("write_socket(%d,%d) wrote %d\n",fd,(int)len,(int)ret));
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DEBUG(0,("write_socket: Error writing %d bytes to socket %d: ERRNO = %s\n",
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(int)len, fd, strerror(errno) ));
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/****************************************************************************
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****************************************************************************/
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BOOL cli_send_smb(struct cli_state *cli)
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/* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
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cli_calculate_sign_mac(cli);
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len = smb_len(cli->outbuf) + 4;
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while (nwritten < len) {
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ret = write_socket(cli->fd,cli->outbuf+nwritten,len - nwritten);
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cli->smb_rw_error = WRITE_ERROR;
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DEBUG(0,("Error writing %d bytes to client. %d (%s)\n",
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(int)len,(int)ret, strerror(errno) ));
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/* Increment the mid so we can tell between responses. */
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/****************************************************************************
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Setup basics in a outgoing packet.
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****************************************************************************/
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void cli_setup_packet(struct cli_state *cli)
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SSVAL(cli->outbuf,smb_pid,cli->pid);
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SSVAL(cli->outbuf,smb_uid,cli->vuid);
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SSVAL(cli->outbuf,smb_mid,cli->mid);
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if (cli->protocol > PROTOCOL_CORE) {
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if (cli->case_sensitive) {
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SCVAL(cli->outbuf,smb_flg,0x0);
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/* Default setting, case insensitive. */
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SCVAL(cli->outbuf,smb_flg,0x8);
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flags2 = FLAGS2_LONG_PATH_COMPONENTS;
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if (cli->capabilities & CAP_UNICODE)
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flags2 |= FLAGS2_UNICODE_STRINGS;
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if ((cli->capabilities & CAP_DFS) && cli->dfsroot)
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flags2 |= FLAGS2_DFS_PATHNAMES;
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if (cli->capabilities & CAP_STATUS32)
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flags2 |= FLAGS2_32_BIT_ERROR_CODES;
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flags2 |= FLAGS2_EXTENDED_SECURITY;
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SSVAL(cli->outbuf,smb_flg2, flags2);
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/****************************************************************************
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Setup the bcc length of the packet from a pointer to the end of the data.
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****************************************************************************/
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void cli_setup_bcc(struct cli_state *cli, void *p)
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set_message_bcc(cli->outbuf, PTR_DIFF(p, smb_buf(cli->outbuf)));
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/****************************************************************************
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Initialise credentials of a client structure.
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****************************************************************************/
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void cli_init_creds(struct cli_state *cli, const char *username, const char *domain, const char *password)
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fstrcpy(cli->domain, domain);
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fstrcpy(cli->user_name, username);
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pwd_set_cleartext(&cli->pwd, password);
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cli->pwd.null_pwd = True;
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DEBUG(10,("cli_init_creds: user %s domain %s\n", cli->user_name, cli->domain));
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/****************************************************************************
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Set the signing state (used from the command line).
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****************************************************************************/
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void cli_setup_signing_state(struct cli_state *cli, int signing_state)
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if (signing_state == Undefined)
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if (signing_state == False) {
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cli->sign_info.allow_smb_signing = False;
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cli->sign_info.mandatory_signing = False;
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cli->sign_info.allow_smb_signing = True;
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if (signing_state == Required)
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cli->sign_info.mandatory_signing = True;
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/****************************************************************************
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Initialise a client structure. Always returns a malloc'ed struct.
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****************************************************************************/
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struct cli_state *cli_initialise(void)
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struct cli_state *cli = NULL;
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/* Check the effective uid - make sure we are not setuid */
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if (is_setuid_root()) {
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DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
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cli = SMB_MALLOC_P(struct cli_state);
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cli->pid = (uint16)sys_getpid();
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cli->vuid = UID_FIELD_INVALID;
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cli->protocol = PROTOCOL_NT1;
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cli->timeout = 20000; /* Timeout is in milliseconds. */
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cli->bufsize = CLI_BUFFER_SIZE+4;
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cli->max_xmit = cli->bufsize;
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cli->outbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
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cli->inbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
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cli->oplock_handler = cli_oplock_ack;
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cli->case_sensitive = False;
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cli->smb_rw_error = 0;
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cli->use_spnego = lp_client_use_spnego();
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cli->capabilities = CAP_UNICODE | CAP_STATUS32 | CAP_DFS;
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/* Set the CLI_FORCE_DOSERR environment variable to test
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client routines using DOS errors instead of STATUS32
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ones. This intended only as a temporary hack. */
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if (getenv("CLI_FORCE_DOSERR"))
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cli->force_dos_errors = True;
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if (lp_client_signing())
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cli->sign_info.allow_smb_signing = True;
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if (lp_client_signing() == Required)
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cli->sign_info.mandatory_signing = True;
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if (!cli->outbuf || !cli->inbuf)
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if ((cli->mem_ctx = talloc_init("cli based talloc")) == NULL)
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memset(cli->outbuf, 0, cli->bufsize);
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memset(cli->inbuf, 0, cli->bufsize);
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#if defined(DEVELOPER)
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/* just because we over-allocate, doesn't mean it's right to use it */
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clobber_region(FUNCTION_MACRO, __LINE__, cli->outbuf+cli->bufsize, SAFETY_MARGIN);
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clobber_region(FUNCTION_MACRO, __LINE__, cli->inbuf+cli->bufsize, SAFETY_MARGIN);
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/* initialise signing */
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cli_null_set_signing(cli);
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cli->initialised = 1;
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/* Clean up after malloc() error */
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SAFE_FREE(cli->inbuf);
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SAFE_FREE(cli->outbuf);
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/****************************************************************************
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Close an open named pipe over SMB. Free any authentication data.
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Returns False if the cli_close call failed.
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****************************************************************************/
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BOOL cli_rpc_pipe_close(struct rpc_pipe_client *cli)
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ret = cli_close(cli->cli, cli->fnum);
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DEBUG(1,("cli_rpc_pipe_close: cli_close failed on pipe %s, "
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"to machine %s. Error was %s\n",
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cli_errstr(cli->cli)));
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if (cli->auth.cli_auth_data_free_func) {
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(*cli->auth.cli_auth_data_free_func)(&cli->auth);
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DEBUG(10,("cli_rpc_pipe_close: closed pipe %s to machine %s\n",
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cli->pipe_name, cli->cli->desthost ));
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DLIST_REMOVE(cli->cli->pipe_list, cli);
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talloc_destroy(cli->mem_ctx);
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/****************************************************************************
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Close all pipes open on this session.
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****************************************************************************/
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void cli_nt_pipes_close(struct cli_state *cli)
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struct rpc_pipe_client *cp, *next;
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for (cp = cli->pipe_list; cp; cp = next) {
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cli_rpc_pipe_close(cp);
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/****************************************************************************
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Shutdown a client structure.
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****************************************************************************/
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void cli_shutdown(struct cli_state *cli)
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cli_nt_pipes_close(cli);
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* tell our peer to free his resources. Wihtout this, when an
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* application attempts to do a graceful shutdown and calls
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* smbc_free_context() to clean up all connections, some connections
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* can remain active on the peer end, until some (long) timeout period
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* later. This tree disconnect forces the peer to clean up, since the
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* connection will be going away.
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* Also, do not do tree disconnect when cli->smb_rw_error is DO_NOT_DO_TDIS
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* the only user for this so far is smbmount which passes opened connection
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* down to kernel's smbfs module.
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if ( (cli->cnum != (uint16)-1) && (cli->smb_rw_error != DO_NOT_DO_TDIS ) ) {
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SAFE_FREE(cli->outbuf);
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SAFE_FREE(cli->inbuf);
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cli_free_signing_context(cli);
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data_blob_free(&cli->secblob);
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data_blob_free(&cli->user_session_key);
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talloc_destroy(cli->mem_ctx);
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cli->smb_rw_error = 0;
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/****************************************************************************
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Set socket options on a open connection.
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****************************************************************************/
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void cli_sockopt(struct cli_state *cli, const char *options)
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set_socket_options(cli->fd, options);
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/****************************************************************************
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Set the PID to use for smb messages. Return the old pid.
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****************************************************************************/
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uint16 cli_setpid(struct cli_state *cli, uint16 pid)
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uint16 ret = cli->pid;
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/****************************************************************************
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Set the case sensitivity flag on the packets. Returns old state.
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****************************************************************************/
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BOOL cli_set_case_sensitive(struct cli_state *cli, BOOL case_sensitive)
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BOOL ret = cli->case_sensitive;
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cli->case_sensitive = case_sensitive;
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/****************************************************************************
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Send a keepalive packet to the server
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****************************************************************************/
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BOOL cli_send_keepalive(struct cli_state *cli)
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DEBUG(3, ("cli_send_keepalive: fd == -1\n"));
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if (!send_keepalive(cli->fd)) {
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DEBUG(0,("Error sending keepalive packet to client.\n"));
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/****************************************************************************
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Send/receive a SMBecho command: ping the server
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****************************************************************************/
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BOOL cli_echo(struct cli_state *cli, unsigned char *data, size_t length)
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SMB_ASSERT(length < 1024);
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memset(cli->outbuf,'\0',smb_size);
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set_message(cli->outbuf,1,length,True);
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SCVAL(cli->outbuf,smb_com,SMBecho);
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SSVAL(cli->outbuf,smb_tid,65535);
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SSVAL(cli->outbuf,smb_vwv0,1);
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cli_setup_packet(cli);
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p = smb_buf(cli->outbuf);
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memcpy(p, data, length);
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cli_setup_bcc(cli, p);
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if (!cli_receive_smb(cli)) {
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if (cli_is_error(cli)) {