clientgen.c

samba-3.0.22.tar.gz 编译smb服务器的源码

/* 
   Unix SMB/CIFS implementation.
   SMB client generic functions
   Copyright (C) Andrew Tridgell 1994-1998
   
   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 2 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, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

/****************************************************************************
 Change the timeout (in milliseconds).
****************************************************************************/

unsigned int cli_set_timeout(struct cli_state *cli, unsigned int timeout)
{
	unsigned int old_timeout = cli->timeout;
	cli->timeout = timeout;
	return old_timeout;
}

/****************************************************************************
 Change the port number used to call on.
****************************************************************************/

int cli_set_port(struct cli_state *cli, int port)
{
	cli->port = port;
	return port;
}

/****************************************************************************
 Read an smb from a fd ignoring all keepalive packets. Note that the buffer 
 *MUST* be of size BUFFER_SIZE+SAFETY_MARGIN.
 The timeout is in milliseconds

 This is exactly the same as receive_smb except that it never returns
 a session keepalive packet (just as receive_smb used to do).
 receive_smb was changed to return keepalives as the oplock processing means this call
 should never go into a blocking read.
****************************************************************************/

static BOOL client_receive_smb(int fd,char *buffer, unsigned int timeout)
{
	BOOL ret;

	for(;;) {
		ret = receive_smb_raw(fd, buffer, timeout);

		if (!ret) {
			DEBUG(10,("client_receive_smb failed\n"));
			show_msg(buffer);
			return ret;
		}

		/* Ignore session keepalive packets. */
		if(CVAL(buffer,0) != SMBkeepalive)
			break;
	}
	show_msg(buffer);
	return ret;
}

/****************************************************************************
 Recv an smb.
****************************************************************************/

BOOL cli_receive_smb(struct cli_state *cli)
{
	extern int smb_read_error;
	BOOL ret;

	/* fd == -1 causes segfaults -- Tom ([e-mail]) */
	if (cli->fd == -1)
		return False; 

 again:
	ret = client_receive_smb(cli->fd,cli->inbuf,cli->timeout);
	
	if (ret) {
		/* it might be an oplock break request */
		if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
		    CVAL(cli->inbuf,smb_com) == SMBlockingX &&
		    SVAL(cli->inbuf,smb_vwv6) == 0 &&
		    SVAL(cli->inbuf,smb_vwv7) == 0) {
			if (cli->oplock_handler) {
				int fnum = SVAL(cli->inbuf,smb_vwv2);
				unsigned char level = CVAL(cli->inbuf,smb_vwv3+1);
				if (!cli->oplock_handler(cli, fnum, level)) return False;
			}
			/* try to prevent loops */
			SCVAL(cli->inbuf,smb_com,0xFF);
			goto again;
		}
	}

	/* If the server is not responding, note that now */

	if (!ret) {
		cli->smb_rw_error = smb_read_error;
		close(cli->fd);
		cli->fd = -1;
		return ret;
	}

	if (!cli_check_sign_mac(cli)) {
		DEBUG(0, ("SMB Signature verification failed on incoming packet!\n"));
		cli->smb_rw_error = READ_BAD_SIG;
		close(cli->fd);
		cli->fd = -1;
		return False;
	};
	return True;
}

static ssize_t write_socket(int fd, const char *buf, size_t len)
{
        ssize_t ret=0;
                                                                                                                                            
        DEBUG(6,("write_socket(%d,%d)\n",fd,(int)len));
        ret = write_data(fd,buf,len);
                                                                                                                                            
        DEBUG(6,("write_socket(%d,%d) wrote %d\n",fd,(int)len,(int)ret));
        if(ret <= 0)
                DEBUG(0,("write_socket: Error writing %d bytes to socket %d: ERRNO = %s\n",
                        (int)len, fd, strerror(errno) ));
                                                                                                                                            
        return(ret);
}

/****************************************************************************
 Send an smb to a fd.
****************************************************************************/

BOOL cli_send_smb(struct cli_state *cli)
{
	size_t len;
	size_t nwritten=0;
	ssize_t ret;

	/* fd == -1 causes segfaults -- Tom ([e-mail]) */
	if (cli->fd == -1)
		return False;

	cli_calculate_sign_mac(cli);

	len = smb_len(cli->outbuf) + 4;

	while (nwritten < len) {
		ret = write_socket(cli->fd,cli->outbuf+nwritten,len - nwritten);
		if (ret <= 0) {
			close(cli->fd);
			cli->fd = -1;
			cli->smb_rw_error = WRITE_ERROR;
			DEBUG(0,("Error writing %d bytes to client. %d (%s)\n",
				(int)len,(int)ret, strerror(errno) ));
			return False;
		}
		nwritten += ret;
	}
	/* Increment the mid so we can tell between responses. */
	cli->mid++;
	if (!cli->mid)
		cli->mid++;
	return True;
}

/****************************************************************************
 Setup basics in a outgoing packet.
****************************************************************************/

void cli_setup_packet(struct cli_state *cli)
{
	cli->rap_error = 0;
	SSVAL(cli->outbuf,smb_pid,cli->pid);
	SSVAL(cli->outbuf,smb_uid,cli->vuid);
	SSVAL(cli->outbuf,smb_mid,cli->mid);
	if (cli->protocol > PROTOCOL_CORE) {
		uint16 flags2;
		if (cli->case_sensitive) {
			SCVAL(cli->outbuf,smb_flg,0x0);
		} else {
			/* Default setting, case insensitive. */
			SCVAL(cli->outbuf,smb_flg,0x8);
		}
		flags2 = FLAGS2_LONG_PATH_COMPONENTS;
		if (cli->capabilities & CAP_UNICODE)
			flags2 |= FLAGS2_UNICODE_STRINGS;
		if (cli->capabilities & CAP_DFS)
			flags2 |= FLAGS2_DFS_PATHNAMES;
		if (cli->capabilities & CAP_STATUS32)
			flags2 |= FLAGS2_32_BIT_ERROR_CODES;
		if (cli->use_spnego)
			flags2 |= FLAGS2_EXTENDED_SECURITY;
		SSVAL(cli->outbuf,smb_flg2, flags2);
	}
}

/****************************************************************************
 Setup the bcc length of the packet from a pointer to the end of the data.
****************************************************************************/

void cli_setup_bcc(struct cli_state *cli, void *p)
{
	set_message_bcc(cli->outbuf, PTR_DIFF(p, smb_buf(cli->outbuf)));
}

/****************************************************************************
 Initialise credentials of a client structure.
****************************************************************************/

void cli_init_creds(struct cli_state *cli, const char *username, const char *domain, const char *password)
{
	fstrcpy(cli->domain, domain);
	fstrcpy(cli->user_name, username);
	pwd_set_cleartext(&cli->pwd, password);
	if (!*username) {
		cli->pwd.null_pwd = True;
	}

        DEBUG(10,("cli_init_creds: user %s domain %s\n", cli->user_name, cli->domain));
}

/****************************************************************************
 Set the signing state (used from the command line).
****************************************************************************/

void cli_setup_signing_state(struct cli_state *cli, int signing_state)
{
	if (signing_state == Undefined)
		return;

	if (signing_state == False) {
		cli->sign_info.allow_smb_signing = False;
		cli->sign_info.mandatory_signing = False;
		return;
	}

	cli->sign_info.allow_smb_signing = True;

	if (signing_state == Required) 
		cli->sign_info.mandatory_signing = True;
}

/****************************************************************************
 Initialise a client structure.
****************************************************************************/

struct cli_state *cli_initialise(struct cli_state *cli)
{
        BOOL alloced_cli = False;

	/* Check the effective uid - make sure we are not setuid */
	if (is_setuid_root()) {
		DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
		return NULL;
	}

	if (!cli) {