smbd/process.c

ソースコードを見る。

データ構造
struct	idle_event
struct	smb_message_struct
関数
uint16	get_current_mid (void)
static BOOL	push_queued_message (char *buf, int msg_len, struct timeval request_time, struct timeval end_time, char *private_data, size_t private_len)
void	remove_deferred_open_smb_message (uint16 mid)
void	schedule_deferred_open_smb_message (uint16 mid)
BOOL	open_was_deferred (uint16 mid)
pending_message_list *	get_open_deferred_message (uint16 mid)
BOOL	push_deferred_smb_message (uint16 mid, struct timeval request_time, struct timeval timeout, char *private_data, size_t priv_len)
static void	idle_event_handler (struct event_context *ctx, struct timed_event *te, const struct timeval *now, void *private_data)
idle_event *	add_idle_event (TALLOC_CTX *mem_ctx, struct timeval interval, BOOL(*handler)(const struct timeval *now, void *private_data), void *private_data)
static void	async_processing (fd_set *pfds)
static int	select_on_fd (int fd, int maxfd, fd_set *fds)
static BOOL	receive_message_or_smb (char *buffer, int buffer_len, int timeout)
NTSTATUS	allow_new_trans (struct trans_state *list, int mid)
void	respond_to_all_remaining_local_messages (void)
static void	smb_dump (const char *name, int type, char *data, ssize_t len)
static int	switch_message (int type, char *inbuf, char *outbuf, int size, int bufsize)
static int	construct_reply (char *inbuf, char *outbuf, int size, int bufsize)
static void	process_smb (char *inbuf, char *outbuf)
const char *	smb_fn_name (int type)
void	add_to_common_flags2 (uint32 v)
void	remove_from_common_flags2 (uint32 v)
void	construct_reply_common (const char *inbuf, char *outbuf)
int	chain_reply (char *inbuf, char *outbuf, int size, int bufsize)
static int	setup_select_timeout (void)
void	check_reload (time_t t)
static BOOL	timeout_processing (int deadtime, int *select_timeout, time_t *last_timeout_processing_time)
char *	get_InBuffer (void)
char *	get_OutBuffer (void)
static char *	NewInBuffer (char **old_inbuf)
static char *	NewOutBuffer (char **old_outbuf)
void	smbd_process (void)
変数
uint16	global_smbpid
int	keepalive
auth_context *	negprot_global_auth_context
int	smb_echo_count
static char *	InBuffer = NULL
static char *	OutBuffer = NULL
static char *	current_inbuf = NULL
int	max_send = BUFFER_SIZE
int	max_recv = BUFFER_SIZE
int	last_message
int	smb_read_error
SIG_ATOMIC_T	reload_after_sighup = 0
SIG_ATOMIC_T	got_sig_term = 0
BOOL	global_machine_password_needs_changing
int	max_send
static struct pending_message_list *	deferred_open_queue
static struct smb_message_struct	smb_messages [256]
static uint32	common_flags2 = FLAGS2_LONG_PATH_COMPONENTS|FLAGS2_32_BIT_ERROR_CODES
const int	total_buffer_size = (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN)

---

関数

uint16 get_current_mid

(

void

)

process.c の 56 行で定義されています。

参照先 InBuffer.

参照元 defer_open()・open_file_ntcreate().

{
        return SVAL(InBuffer,smb_mid);
}

static BOOL push_queued_message	(	char *	buf,
		int	msg_len,
		struct timeval	request_time,
		struct timeval	end_time,
		char *	private_data,
		size_t	private_len
	)			[static]

process.c の 73 行で定義されています。

参照先 pending_message_list::buf・data_blob_::data・data_blob_talloc()・deferred_open_queue・pending_message_list::end_time・pending_message_list::private_data・pending_message_list::request_time.

参照元 push_deferred_smb_message().

{
        struct pending_message_list *msg;

        msg = TALLOC_ZERO_P(NULL, struct pending_message_list);

        if(msg == NULL) {
                DEBUG(0,("push_message: malloc fail (1)\n"));
                return False;
        }

        msg->buf = data_blob_talloc(msg, buf, msg_len);
        if(msg->buf.data == NULL) {
                DEBUG(0,("push_message: malloc fail (2)\n"));
                TALLOC_FREE(msg);
                return False;
        }

        msg->request_time = request_time;
        msg->end_time = end_time;

        if (private_data) {
                msg->private_data = data_blob_talloc(msg, private_data,
                                                     private_len);
                if (msg->private_data.data == NULL) {
                        DEBUG(0,("push_message: malloc fail (3)\n"));
                        TALLOC_FREE(msg);
                        return False;
                }
        }

        DLIST_ADD_END(deferred_open_queue, msg, struct pending_message_list *);

        DEBUG(10,("push_message: pushed message length %u on "
                  "deferred_open_queue\n", (unsigned int)msg_len));

        return True;
}

void remove_deferred_open_smb_message

(

uint16

mid

)

process.c の 119 行で定義されています。

参照先 pending_message_list::buf・data_blob_::data・deferred_open_queue・data_blob_::length・pending_message_list::next.

参照元 open_file_ntcreate().

{
        struct pending_message_list *pml;

        for (pml = deferred_open_queue; pml; pml = pml->next) {
                if (mid == SVAL(pml->buf.data,smb_mid)) {
                        DEBUG(10,("remove_sharing_violation_open_smb_message: "
                                  "deleting mid %u len %u\n",
                                  (unsigned int)mid,
                                  (unsigned int)pml->buf.length ));
                        DLIST_REMOVE(deferred_open_queue, pml);
                        TALLOC_FREE(pml);
                        return;
                }
        }
}

void schedule_deferred_open_smb_message

(

uint16

mid

)

process.c の 141 行で定義されています。

参照先 pending_message_list::buf・data_blob_::data・deferred_open_queue・pending_message_list::end_time・pending_message_list::next.

参照元 notify_deferred_opens()・process_open_retry_message()・process_oplock_break_response().

{
        struct pending_message_list *pml;
        int i = 0;

        for (pml = deferred_open_queue; pml; pml = pml->next) {
                uint16 msg_mid = SVAL(pml->buf.data,smb_mid);
                DEBUG(10,("schedule_deferred_open_smb_message: [%d] msg_mid = %u\n", i++,
                        (unsigned int)msg_mid ));
                if (mid == msg_mid) {
                        DEBUG(10,("schedule_deferred_open_smb_message: scheduling mid %u\n",
                                mid ));
                        pml->end_time.tv_sec = 0;
                        pml->end_time.tv_usec = 0;
                        DLIST_PROMOTE(deferred_open_queue, pml);
                        return;
                }
        }

        DEBUG(10,("schedule_deferred_open_smb_message: failed to find message mid %u\n",
                mid ));
}

BOOL open_was_deferred

(

uint16

mid

)

process.c の 168 行で定義されています。

参照先 pending_message_list::buf・data_blob_::data・deferred_open_queue・pending_message_list::next.

参照元 call_nt_transact_create()・call_nt_transact_rename()・call_trans2open()・call_trans2setfilepathinfo()・reply_ctemp()・reply_mknew()・reply_mv()・reply_ntcreate_and_X()・reply_ntrename()・reply_open()・reply_open_and_X()・reply_unlink()・validate_my_share_entries().

{
        struct pending_message_list *pml;

        for (pml = deferred_open_queue; pml; pml = pml->next) {
                if (SVAL(pml->buf.data,smb_mid) == mid) {
                        return True;
                }
        }
        return False;
}

struct pending_message_list* get_open_deferred_message

(

uint16

mid

)

process.c の 184 行で定義されています。

参照先 pending_message_list::buf・data_blob_::data・deferred_open_queue・pending_message_list::next.

参照元 open_file_ntcreate().

{
        struct pending_message_list *pml;

        for (pml = deferred_open_queue; pml; pml = pml->next) {
                if (SVAL(pml->buf.data,smb_mid) == mid) {
                        return pml;
                }
        }
        return NULL;
}

BOOL push_deferred_smb_message	(	uint16	mid,
		struct timeval	request_time,
		struct timeval	timeout,
		char *	private_data,
		size_t	priv_len
	)

process.c の 201 行で定義されています。

参照先 current_inbuf・push_queued_message()・timeval_sum().

{
        struct timeval end_time;

        end_time = timeval_sum(&request_time, &timeout);

        DEBUG(10,("push_deferred_open_smb_message: pushing message len %u mid %u "
                  "timeout time [%u.%06u]\n",
                  (unsigned int) smb_len(current_inbuf)+4, (unsigned int)mid,
                  (unsigned int)end_time.tv_sec,
                  (unsigned int)end_time.tv_usec));

        return push_queued_message(current_inbuf, smb_len(current_inbuf)+4,
                                   request_time, end_time,
                                   private_data, priv_len);
}

static void idle_event_handler	(	struct event_context *	ctx,
		struct timed_event *	te,
		const struct timeval *	now,
		void *	private_data
	)			[static]

process.c の 228 行で定義されています。

参照先 event_add_timed()・idle_event::handler・idle_event::interval・idle_event::private_data・smbd_event_context()・idle_event::te・timeval_sum().

参照元 add_idle_event().

{
        struct idle_event *event =
                talloc_get_type_abort(private_data, struct idle_event);

        TALLOC_FREE(event->te);

        if (!event->handler(now, event->private_data)) {
                /* Don't repeat, delete ourselves */
                TALLOC_FREE(event);
                return;
        }

        event->te = event_add_timed(smbd_event_context(), event,
                                    timeval_sum(now, &event->interval),
                                    "idle_event_handler",
                                    idle_event_handler, event);

        /* We can't do much but fail here. */
        SMB_ASSERT(event->te != NULL);
}

struct idle_event* add_idle_event	(	TALLOC_CTX *	mem_ctx,
		struct timeval	interval,
		BOOL(*)(const struct timeval *now, void *private_data)	handler,
		void *	private_data
	)

process.c の 253 行で定義されています。

参照先 event_add_timed()・idle_event_handler()・result・smbd_event_context()・timeval_current()・timeval_sum().

{
        struct idle_event *result;
        struct timeval now = timeval_current();

        result = TALLOC_P(mem_ctx, struct idle_event);
        if (result == NULL) {
                DEBUG(0, ("talloc failed\n"));
                return NULL;
        }

        result->interval = interval;
        result->handler = handler;
        result->private_data = private_data;

        result->te = event_add_timed(smbd_event_context(), result,
                                     timeval_sum(&now, &interval),
                                     "idle_event_handler",
                                     idle_event_handler, result);
        if (result->te == NULL) {
                DEBUG(0, ("event_add_timed failed\n"));
                TALLOC_FREE(result);
                return NULL;
        }

        return result;
}

static void async_processing

(

fd_set *

pfds

)

[static]

process.c の 290 行で定義されています。

参照先 change_to_root_user()・exit_server_cleanly()・got_sig_term・process_aio_queue()・process_kernel_oplocks()・reload_after_sighup・reload_services().

参照元 receive_message_or_smb().

{
        DEBUG(10,("async_processing: Doing async processing.\n"));

        process_aio_queue();

        process_kernel_oplocks(pfds);

        /* Do the aio check again after receive_local_message as it does a
           select and may have eaten our signal. */
        /* Is this till true? -- vl */
        process_aio_queue();

        if (got_sig_term) {
                exit_server_cleanly("termination signal");
        }

        /* check for sighup processing */
        if (reload_after_sighup) {
                change_to_root_user();
                DEBUG(1,("Reloading services after SIGHUP\n"));
                reload_services(False);
                reload_after_sighup = 0;
        }
}

static int select_on_fd	(	int	fd,
		int	maxfd,
		fd_set *	fds
	)			[static]

process.c の 320 行で定義されています。

参照元 receive_message_or_smb().

{
        if (fd != -1) {
                FD_SET(fd, fds);
                maxfd = MAX(maxfd, fd);
        }

        return maxfd;
}

static BOOL receive_message_or_smb	(	char *	buffer,
		int	buffer_len,
		int	timeout
	)			[static]

process.c の 351 行で定義されています。

参照先 async_processing()・pending_message_list::buf・data_blob_::data・deferred_open_queue・pending_message_list::end_time・errno・event_add_to_select_args()・GetTimeOfDay()・data_blob_::length・message_dispatch()・oplock_message_waiting()・oplock_notify_fd()・receive_smb()・run_events()・select_on_fd()・smb_read_error・smbd_event_context()・smbd_server_fd()・sys_select()・timeval_is_zero()・usec_time_diff().

参照元 smbd_process().

{
        fd_set r_fds, w_fds;
        int selrtn;
        struct timeval to;
        int maxfd = 0;

        smb_read_error = 0;

 again:

        if (timeout >= 0) {
                to.tv_sec = timeout / 1000;
                to.tv_usec = (timeout % 1000) * 1000;
        } else {
                to.tv_sec = SMBD_SELECT_TIMEOUT;
                to.tv_usec = 0;
        }

        /*
         * Note that this call must be before processing any SMB
         * messages as we need to synchronously process any messages
         * we may have sent to ourselves from the previous SMB.
         */
        message_dispatch();

        /*
         * Check to see if we already have a message on the deferred open queue
         * and it's time to schedule.
         */
        if(deferred_open_queue != NULL) {
                BOOL pop_message = False;
                struct pending_message_list *msg = deferred_open_queue;

                if (timeval_is_zero(&msg->end_time)) {
                        pop_message = True;
                } else {
                        struct timeval tv;
                        SMB_BIG_INT tdif;

                        GetTimeOfDay(&tv);
                        tdif = usec_time_diff(&msg->end_time, &tv);
                        if (tdif <= 0) {
                                /* Timed out. Schedule...*/
                                pop_message = True;
                                DEBUG(10,("receive_message_or_smb: queued message timed out.\n"));
                        } else {
                                /* Make a more accurate select timeout. */
                                to.tv_sec = tdif / 1000000;
                                to.tv_usec = tdif % 1000000;
                                DEBUG(10,("receive_message_or_smb: select with timeout of [%u.%06u]\n",
                                        (unsigned int)to.tv_sec, (unsigned int)to.tv_usec ));
                        }
                }

                if (pop_message) {
                        memcpy(buffer, msg->buf.data, MIN(buffer_len, msg->buf.length));
  
                        /* We leave this message on the queue so the open code can
                           know this is a retry. */
                        DEBUG(5,("receive_message_or_smb: returning deferred open smb message.\n"));
                        return True;
                }
        }

        /*
         * Setup the select fd sets.
         */

        FD_ZERO(&r_fds);
        FD_ZERO(&w_fds);

        /*
         * Ensure we process oplock break messages by preference.
         * We have to do this before the select, after the select
         * and if the select returns EINTR. This is due to the fact
         * that the selects called from async_processing can eat an EINTR
         * caused by a signal (we can't take the break message there).
         * This is hideously complex - *MUST* be simplified for 3.0 ! JRA.
         */

        if (oplock_message_waiting(&r_fds)) {
                DEBUG(10,("receive_message_or_smb: oplock_message is waiting.\n"));
                async_processing(&r_fds);
                /*
                 * After async processing we must go and do the select again, as
                 * the state of the flag in fds for the server file descriptor is
                 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
                 */
                goto again;
        }

        /*
         * Are there any timed events waiting ? If so, ensure we don't
         * select for longer than it would take to wait for them.
         */

        {
                struct timeval now;
                GetTimeOfDay(&now);

                event_add_to_select_args(smbd_event_context(), &now,
                                         &r_fds, &w_fds, &to, &maxfd);
        }

        if (timeval_is_zero(&to)) {
                /* Process a timed event now... */
                if (run_events(smbd_event_context(), 0, NULL, NULL)) {
                        goto again;
                }
        }
        
        {
                int sav;
                START_PROFILE(smbd_idle);

                maxfd = select_on_fd(smbd_server_fd(), maxfd, &r_fds);
                maxfd = select_on_fd(oplock_notify_fd(), maxfd, &r_fds);

                selrtn = sys_select(maxfd+1,&r_fds,&w_fds,NULL,&to);
                sav = errno;

                END_PROFILE(smbd_idle);
                errno = sav;
        }

        if (run_events(smbd_event_context(), selrtn, &r_fds, &w_fds)) {
                goto again;
        }

        /* if we get EINTR then maybe we have received an oplock
           signal - treat this as select returning 1. This is ugly, but
           is the best we can do until the oplock code knows more about
           signals */
        if (selrtn == -1 && errno == EINTR) {
                async_processing(&r_fds);
                /*
                 * After async processing we must go and do the select again, as
                 * the state of the flag in fds for the server file descriptor is
                 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
                 */
                goto again;
        }

        /* Check if error */
        if (selrtn == -1) {
                /* something is wrong. Maybe the socket is dead? */
                smb_read_error = READ_ERROR;
                return False;
        } 
    
        /* Did we timeout ? */
        if (selrtn == 0) {
                smb_read_error = READ_TIMEOUT;
                return False;
        }

        /*
         * Ensure we process oplock break messages by preference.
         * This is IMPORTANT ! Otherwise we can starve other processes
         * sending us an oplock break message. JRA.
         */

        if (oplock_message_waiting(&r_fds)) {
                async_processing(&r_fds);
                /*
                 * After async processing we must go and do the select again, as
                 * the state of the flag in fds for the server file descriptor is
                 * indeterminate - we may have done I/O on it in the oplock processing. JRA.
                 */
                goto again;
        }

        return receive_smb(smbd_server_fd(), buffer,
                        BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE, 0);
}

NTSTATUS allow_new_trans	(	struct trans_state *	list,
		int	mid
	)

process.c の 533 行で定義されています。

参照先 list().

参照元 reply_nttrans()・reply_trans()・reply_trans2().

{
        int count = 0;
        for (; list != NULL; list = list->next) {

                if (list->mid == mid) {
                        return NT_STATUS_INVALID_PARAMETER;
                }

                count += 1;
        }
        if (count > 5) {
                return NT_STATUS_INSUFFICIENT_RESOURCES;
        }

        return NT_STATUS_OK;
}

void respond_to_all_remaining_local_messages

(

void

)

process.c の 558 行で定義されています。

参照先 get_number_of_exclusive_open_oplocks()・process_kernel_oplocks().

参照元 exit_server_common().

{
        /*
         * Assert we have no exclusive open oplocks.
         */

        if(get_number_of_exclusive_open_oplocks()) {
                DEBUG(0,("respond_to_all_remaining_local_messages: PANIC : we have %d exclusive oplocks.\n",
                        get_number_of_exclusive_open_oplocks() ));
                return;
        }

        process_kernel_oplocks(NULL);

        return;
}

static void smb_dump	(	const char *	name,
		int	type,
		char *	data,
		ssize_t	len
	)			[static]

process.c の 864 行で定義されています。

参照先 DEBUGLEVEL・errno・fd.

参照元 switch_message().

{
        int fd, i;
        pstring fname;
        if (DEBUGLEVEL < 50) return;

        if (len < 4) len = smb_len(data)+4;
        for (i=1;i<100;i++) {
                slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.%s", name, i,
                                type ? "req" : "resp");
                fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
                if (fd != -1 || errno != EEXIST) break;
        }
        if (fd != -1) {
                ssize_t ret = write(fd, data, len);
                if (ret != len)
                        DEBUG(0,("smb_dump: problem: write returned %d\n", (int)ret ));
                close(fd);
                DEBUG(0,("created %s len %lu\n", fname, (unsigned long)len));
        }
}

static int switch_message	(	int	type,
		char *	inbuf,
		char *	outbuf,
		int	size,
		int	bufsize
	)			[static]

process.c の 891 行で定義されています。

参照先 change_to_guest()・change_to_root_user()・change_to_user()・check_access()・conn_find()・current_inbuf・errno・exit_server_cleanly()・smb_message_struct::flags・flags・smb_message_struct::fn・fn・get_valid_user_struct()・global_smbpid・last_message・reply_unknown()・SEC_SHARE・set_current_service()・set_current_user_info()・smb_dump()・smb_fn_name()・smb_messages・smbd_server_fd()・sys_getpid()・user_struct::user.

参照元 chain_reply()・construct_reply().

{
        static pid_t pid= (pid_t)-1;
        int outsize = 0;

        type &= 0xff;

        if (pid == (pid_t)-1)
                pid = sys_getpid();

        errno = 0;

        last_message = type;

        /* Make sure this is an SMB packet. smb_size contains NetBIOS header so subtract 4 from it. */
        if ((strncmp(smb_base(inbuf),"\377SMB",4) != 0) || (size < (smb_size - 4))) {
                DEBUG(2,("Non-SMB packet of length %d. Terminating server\n",smb_len(inbuf)));
                exit_server_cleanly("Non-SMB packet");
                return(-1);
        }

        /* yuck! this is an interim measure before we get rid of our
                current inbuf/outbuf system */
        global_smbpid = SVAL(inbuf,smb_pid);

        if (smb_messages[type].fn == NULL) {
                DEBUG(0,("Unknown message type %d!\n",type));
                smb_dump("Unknown", 1, inbuf, size);
                outsize = reply_unknown(inbuf,outbuf);
        } else {
                int flags = smb_messages[type].flags;
                static uint16 last_session_tag = UID_FIELD_INVALID;
                /* In share mode security we must ignore the vuid. */
                uint16 session_tag = (lp_security() == SEC_SHARE) ? UID_FIELD_INVALID : SVAL(inbuf,smb_uid);
                connection_struct *conn = conn_find(SVAL(inbuf,smb_tid));

                DEBUG(3,("switch message %s (pid %d) conn 0x%lx\n",smb_fn_name(type),(int)pid,(unsigned long)conn));

                smb_dump(smb_fn_name(type), 1, inbuf, size);

                /* Ensure this value is replaced in the incoming packet. */
                SSVAL(inbuf,smb_uid,session_tag);

                /*
                 * Ensure the correct username is in current_user_info.
                 * This is a really ugly bugfix for problems with
                 * multiple session_setup_and_X's being done and
                 * allowing %U and %G substitutions to work correctly.
                 * There is a reason this code is done here, don't
                 * move it unless you know what you're doing... :-).
                 * JRA.
                 */

                if (session_tag != last_session_tag) {
                        user_struct *vuser = NULL;

                        last_session_tag = session_tag;
                        if(session_tag != UID_FIELD_INVALID) {
                                vuser = get_valid_user_struct(session_tag);           
                                if (vuser) {
                                        set_current_user_info(&vuser->user);
                                }
                        }
                }

                /* Does this call need to be run as the connected user? */
                if (flags & AS_USER) {

                        /* Does this call need a valid tree connection? */
                        if (!conn) {
                                /* Amazingly, the error code depends on the command (from Samba4). */
                                if (type == SMBntcreateX) {
                                        return ERROR_NT(NT_STATUS_INVALID_HANDLE);
                                } else {
                                        return ERROR_DOS(ERRSRV, ERRinvnid);
                                }
                        }

                        if (!change_to_user(conn,session_tag)) {
                                return(ERROR_NT(NT_STATUS_DOS(ERRSRV,ERRbaduid)));
                        }

                        /* All NEED_WRITE and CAN_IPC flags must also have AS_USER. */

                        /* Does it need write permission? */
                        if ((flags & NEED_WRITE) && !CAN_WRITE(conn)) {
                                return ERROR_NT(NT_STATUS_MEDIA_WRITE_PROTECTED);
                        }

                        /* IPC services are limited */
                        if (IS_IPC(conn) && !(flags & CAN_IPC)) {
                                return(ERROR_DOS(ERRSRV,ERRaccess));
                        }
                } else {
                        /* This call needs to be run as root */
                        change_to_root_user();
                }

                /* load service specific parameters */
                if (conn) {
                        if (!set_current_service(conn,SVAL(inbuf,smb_flg),(flags & (AS_USER|DO_CHDIR)?True:False))) {
                                return(ERROR_DOS(ERRSRV,ERRaccess));
                        }
                        conn->num_smb_operations++;
                }

                /* does this protocol need to be run as guest? */
                if ((flags & AS_GUEST) && (!change_to_guest() || 
                                !check_access(smbd_server_fd(), lp_hostsallow(-1), lp_hostsdeny(-1)))) {
                        return(ERROR_DOS(ERRSRV,ERRaccess));
                }

                current_inbuf = inbuf; /* In case we need to defer this message in open... */
                outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
        }

        smb_dump(smb_fn_name(type), 0, outbuf, outsize);

        return(outsize);
}

static int construct_reply	(	char *	inbuf,
		char *	outbuf,
		int	size,
		int	bufsize
	)			[static]

process.c の 1016 行で定義されています。

参照先 chain_size・construct_reply_common()・file_chain_reset()・reply_special()・reset_chain_p()・smb_setlen()・switch_message()・type.

参照元 process_smb().

{
        int type = CVAL(inbuf,smb_com);
        int outsize = 0;
        int msg_type = CVAL(inbuf,0);

        chain_size = 0;
        file_chain_reset();
        reset_chain_p();

        if (msg_type != 0)
                return(reply_special(inbuf,outbuf));  

        construct_reply_common(inbuf, outbuf);

        outsize = switch_message(type,inbuf,outbuf,size,bufsize);

        outsize += chain_size;

        if(outsize > 4)
                smb_setlen(outbuf,outsize - 4);
        return(outsize);
}

static void process_smb	(	char *	inbuf,
		char *	outbuf
	)			[static]

process.c の 1044 行で定義されています。

参照先 buf・check_access()・client_addr()・construct_reply()・exit_server_cleanly()・len・max_send・send_smb()・show_msg()・smbd_server_fd()・trans_num.

参照元 smbd_process().

{
        static int trans_num;
        int msg_type = CVAL(inbuf,0);
        int32 len = smb_len(inbuf);
        int nread = len + 4;

        DO_PROFILE_INC(smb_count);

        if (trans_num == 0) {
                /* on the first packet, check the global hosts allow/ hosts
                deny parameters before doing any parsing of the packet
                passed to us by the client.  This prevents attacks on our
                parsing code from hosts not in the hosts allow list */
                if (!check_access(smbd_server_fd(), lp_hostsallow(-1),
                                  lp_hostsdeny(-1))) {
                        /* send a negative session response "not listening on calling name" */
                        static unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
                        DEBUG( 1, ( "Connection denied from %s\n", client_addr() ) );
                        (void)send_smb(smbd_server_fd(),(char *)buf);
                        exit_server_cleanly("connection denied");
                }
        }

        DEBUG( 6, ( "got message type 0x%x of len 0x%x\n", msg_type, len ) );
        DEBUG( 3, ( "Transaction %d of length %d\n", trans_num, nread ) );

        if (msg_type == 0)
                show_msg(inbuf);
        else if(msg_type == SMBkeepalive)
                return; /* Keepalive packet. */

        nread = construct_reply(inbuf,outbuf,nread,max_send);
      
        if(nread > 0) {
                if (CVAL(outbuf,0) == 0)
                        show_msg(outbuf);
        
                if (nread != smb_len(outbuf) + 4) {
                        DEBUG(0,("ERROR: Invalid message response size! %d %d\n",
                                nread, smb_len(outbuf)));
                } else if (!send_smb(smbd_server_fd(),outbuf)) {
                        exit_server_cleanly("process_smb: send_smb failed.");
                }
        }
        trans_num++;
}

const char* smb_fn_name

(

int

type

)

process.c の 1096 行で定義されています。

参照先 name・smb_messages.

参照元 call_trans2findfirst()・call_trans2findnext()・call_trans2qfsinfo()・error_packet_set()・reply_search()・reply_unknown()・switch_message().

{
        const char *unknown_name = "SMBunknown";

        if (smb_messages[type].name == NULL)
                return(unknown_name);

        return(smb_messages[type].name);
}

void add_to_common_flags2

(

uint32

v

)

process.c の 1112 行で定義されています。

参照元 reply_nt1().

{
        common_flags2 |= v;
}

void remove_from_common_flags2

(

uint32

v

)

process.c の 1117 行で定義されています。

参照元 reply_sesssetup_and_X()・reply_sesssetup_and_X_spnego().

{
        common_flags2 &= ~v;
}

void construct_reply_common	(	const char *	inbuf,
		char *	outbuf
	)

process.c の 1122 行で定義されています。

参照先 set_message().

参照元 blocking_lock_reply_error()・chain_reply()・change_notify_reply()・change_notify_reply_packet()・construct_reply()・generic_blocking_lock_error()・process_trans2()・reply_lockingX_success().

{
        set_message(outbuf,0,0,False);
        
        SCVAL(outbuf,smb_com,CVAL(inbuf,smb_com));
        SIVAL(outbuf,smb_rcls,0);
        SCVAL(outbuf,smb_flg, FLAG_REPLY | (CVAL(inbuf,smb_flg) & FLAG_CASELESS_PATHNAMES)); 
        SSVAL(outbuf,smb_flg2,
                (SVAL(inbuf,smb_flg2) & FLAGS2_UNICODE_STRINGS) |
                common_flags2);
        memset(outbuf+smb_pidhigh,'\0',(smb_tid-smb_pidhigh));

        SSVAL(outbuf,smb_tid,SVAL(inbuf,smb_tid));
        SSVAL(outbuf,smb_pid,SVAL(inbuf,smb_pid));
        SSVAL(outbuf,smb_uid,SVAL(inbuf,smb_uid));
        SSVAL(outbuf,smb_mid,SVAL(inbuf,smb_mid));
}

int chain_reply	(	char *	inbuf,
		char *	outbuf,
		int	size,
		int	bufsize
	)

process.c の 1144 行で定義されています。

参照先 chain_size・construct_reply_common()・exit_server_cleanly()・show_msg()・smb_setlen()・switch_message().

参照元 do_ntcreate_pipe_open()・reply_lockingX()・reply_lockingX_success()・reply_ntcreate_and_X()・reply_ntcreate_and_X_quota()・reply_open_and_X()・reply_open_pipe_and_X()・reply_pipe_read_and_X()・reply_pipe_write_and_X()・reply_read_and_X()・reply_sesssetup_and_X()・reply_tcon_and_X()・reply_ulogoffX()・reply_write_and_X().

{
        static char *orig_inbuf;
        static char *orig_outbuf;
        int smb_com1, smb_com2 = CVAL(inbuf,smb_vwv0);
        unsigned smb_off2 = SVAL(inbuf,smb_vwv1);
        char *inbuf2, *outbuf2;
        int outsize2;
        int new_size;
        char inbuf_saved[smb_wct];
        char outbuf_saved[smb_wct];
        int outsize = smb_len(outbuf) + 4;

        /* Maybe its not chained, or it's an error packet. */
        if (smb_com2 == 0xFF || SVAL(outbuf,smb_rcls) != 0) {
                SCVAL(outbuf,smb_vwv0,0xFF);
                return outsize;
        }

        if (chain_size == 0) {
                /* this is the first part of the chain */
                orig_inbuf = inbuf;
                orig_outbuf = outbuf;
        }

        /*
         * The original Win95 redirector dies on a reply to
         * a lockingX and read chain unless the chain reply is
         * 4 byte aligned. JRA.
         */

        outsize = (outsize + 3) & ~3;

        /* we need to tell the client where the next part of the reply will be */
        SSVAL(outbuf,smb_vwv1,smb_offset(outbuf+outsize,outbuf));
        SCVAL(outbuf,smb_vwv0,smb_com2);

        /* remember how much the caller added to the chain, only counting stuff
                after the parameter words */
        chain_size += outsize - smb_wct;

        /* work out pointers into the original packets. The
                headers on these need to be filled in */
        inbuf2 = orig_inbuf + smb_off2 + 4 - smb_wct;
        outbuf2 = orig_outbuf + SVAL(outbuf,smb_vwv1) + 4 - smb_wct;

        /* remember the original command type */
        smb_com1 = CVAL(orig_inbuf,smb_com);

        /* save the data which will be overwritten by the new headers */
        memcpy(inbuf_saved,inbuf2,smb_wct);
        memcpy(outbuf_saved,outbuf2,smb_wct);

        /* give the new packet the same header as the last part of the SMB */
        memmove(inbuf2,inbuf,smb_wct);

        /* create the in buffer */
        SCVAL(inbuf2,smb_com,smb_com2);

        /* work out the new size for the in buffer. */
        new_size = size - (inbuf2 - inbuf);
        if (new_size < 0) {
                DEBUG(0,("chain_reply: chain packet size incorrect (orig size = %d, "
                        "offset = %d)\n",
                        size,
                        (inbuf2 - inbuf) ));
                exit_server_cleanly("Bad chained packet");
                return(-1);
        }

        /* And set it in the header. */
        smb_setlen(inbuf2, new_size);

        /* create the out buffer */
        construct_reply_common(inbuf2, outbuf2);

        DEBUG(3,("Chained message\n"));
        show_msg(inbuf2);

        /* process the request */
        outsize2 = switch_message(smb_com2,inbuf2,outbuf2,new_size,
                                bufsize-chain_size);

        /* copy the new reply and request headers over the old ones, but
                preserve the smb_com field */
        memmove(orig_outbuf,outbuf2,smb_wct);
        SCVAL(orig_outbuf,smb_com,smb_com1);

        /* restore the saved data, being careful not to overwrite any
                data from the reply header */
        memcpy(inbuf2,inbuf_saved,smb_wct);

        {
                int ofs = smb_wct - PTR_DIFF(outbuf2,orig_outbuf);
                if (ofs < 0) {
                        ofs = 0;
                }
                memmove(outbuf2+ofs,outbuf_saved+ofs,smb_wct-ofs);
        }

        return outsize2;
}

static int setup_select_timeout

(

void

)

[static]

process.c の 1251 行で定義されています。

参照先 blocking_locks_timeout_ms()・print_notify_messages_pending().

参照元 smbd_process()・timeout_processing().

{
        int select_timeout;

        select_timeout = blocking_locks_timeout_ms(SMBD_SELECT_TIMEOUT*1000);

        if (print_notify_messages_pending()) {
                select_timeout = MIN(select_timeout, 1000);
        }

        return select_timeout;
}

void check_reload

(

time_t

t

)

process.c の 1268 行で定義されています。

参照先 mypid・reload_after_sighup・reload_printers()・reload_services().

参照元 open_sockets_smbd()・timeout_processing().

{
        static pid_t mypid = 0;
        static time_t last_smb_conf_reload_time = 0;
        static time_t last_printer_reload_time = 0;
        time_t printcap_cache_time = (time_t)lp_printcap_cache_time();

        if(last_smb_conf_reload_time == 0) {
                last_smb_conf_reload_time = t;
                /* Our printing subsystem might not be ready at smbd start up.
                   Then no printer is available till the first printers check
                   is performed.  A lower initial interval circumvents this. */
                if ( printcap_cache_time > 60 )
                        last_printer_reload_time = t - printcap_cache_time + 60;
                else
                        last_printer_reload_time = t;
        }

        if (mypid != getpid()) { /* First time or fork happened meanwhile */
                /* randomize over 60 second the printcap reload to avoid all
                 * process hitting cupsd at the same time */
                int time_range = 60;

                last_printer_reload_time += random() % time_range;
                mypid = getpid();
        }

        if (reload_after_sighup || (t >= last_smb_conf_reload_time+SMBD_RELOAD_CHECK)) {
                reload_services(True);
                reload_after_sighup = False;
                last_smb_conf_reload_time = t;
        }

        /* 'printcap cache time = 0' disable the feature */
        
        if ( printcap_cache_time != 0 )
        { 
                /* see if it's time to reload or if the clock has been set back */
                
                if ( (t >= last_printer_reload_time+printcap_cache_time) 
                        || (t-last_printer_reload_time  < 0) ) 
                {
                        DEBUG( 3,( "Printcap cache time expired.\n"));
                        reload_printers();
                        last_printer_reload_time = t;
                }
        }
}

static BOOL timeout_processing	(	int	deadtime,
		int *	select_timeout,
		time_t *	last_timeout_processing_time
	)			[static]

process.c の 1321 行で定義されています。

参照先 auth_context::challenge_set_method・change_to_root_user()・change_trust_account_password()・check_log_size()・check_reload()・conn_idle_all()・conn_num_open()・errno・force_check_log_size()・global_machine_password_needs_changing・global_myname・keepalive・lp_workgroup()・negprot_global_auth_context・print_notify_send_messages()・auth_methods::private_data・process_blocking_lock_queue()・SEC_DOMAIN・secrets_fetch_trust_account_password()・secrets_lock_trust_account_password()・auth_methods::send_keepalive・send_keepalive()・setup_select_timeout()・smb_read_error・smb_run_idle_events()・smbd_server_fd()・strerror()・t・update_monitored_printq_cache().

参照元 smbd_process().

{
        static time_t last_keepalive_sent_time = 0;
        static time_t last_idle_closed_check = 0;
        time_t t;
        BOOL allidle = True;

        if (smb_read_error == READ_EOF) {
                DEBUG(3,("timeout_processing: End of file from client (client has disconnected).\n"));
                return False;
        }

        if (smb_read_error == READ_ERROR) {
                DEBUG(3,("timeout_processing: receive_smb error (%s) Exiting\n",
                        strerror(errno)));
                return False;
        }

        if (smb_read_error == READ_BAD_SIG) {
                DEBUG(3,("timeout_processing: receive_smb error bad smb signature. Exiting\n"));
                return False;
        }

        *last_timeout_processing_time = t = time(NULL);

        if(last_keepalive_sent_time == 0)
                last_keepalive_sent_time = t;

        if(last_idle_closed_check == 0)
                last_idle_closed_check = t;

        /* become root again if waiting */
        change_to_root_user();

        /* run all registered idle events */
        smb_run_idle_events(t);

        /* check if we need to reload services */
        check_reload(t);

        /* automatic timeout if all connections are closed */      
        if (conn_num_open()==0 && (t - last_idle_closed_check) >= IDLE_CLOSED_TIMEOUT) {
                DEBUG( 2, ( "Closing idle connection\n" ) );
                return False;
        } else {
                last_idle_closed_check = t;
        }

        if (keepalive && (t - last_keepalive_sent_time)>keepalive) {
                if (!send_keepalive(smbd_server_fd())) {
                        DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
                        return False;
                }

                /* send a keepalive for a password server or the like.
                        This is attached to the auth_info created in the
                negprot */
                if (negprot_global_auth_context && negprot_global_auth_context->challenge_set_method 
                                && negprot_global_auth_context->challenge_set_method->send_keepalive) {

                        negprot_global_auth_context->challenge_set_method->send_keepalive
                        (&negprot_global_auth_context->challenge_set_method->private_data);
                }

                last_keepalive_sent_time = t;
        }

        /* check for connection timeouts */
        allidle = conn_idle_all(t, deadtime);

        if (allidle && conn_num_open()>0) {
                DEBUG(2,("Closing idle connection 2.\n"));
                return False;
        }

        if(global_machine_password_needs_changing && 
                        /* for ADS we need to do a regular ADS password change, not a domain
                                        password change */
                        lp_security() == SEC_DOMAIN) {

                unsigned char trust_passwd_hash[16];
                time_t lct;

                /*
                 * We're in domain level security, and the code that
                 * read the machine password flagged that the machine
                 * password needs changing.
                 */

                /*
                 * First, open the machine password file with an exclusive lock.
                 */

                if (secrets_lock_trust_account_password(lp_workgroup(), True) == False) {
                        DEBUG(0,("process: unable to lock the machine account password for \
machine %s in domain %s.\n", global_myname(), lp_workgroup() ));
                        return True;
                }

                if(!secrets_fetch_trust_account_password(lp_workgroup(), trust_passwd_hash, &lct, NULL)) {
                        DEBUG(0,("process: unable to read the machine account password for \
machine %s in domain %s.\n", global_myname(), lp_workgroup()));
                        secrets_lock_trust_account_password(lp_workgroup(), False);
                        return True;
                }

                /*
                 * Make sure someone else hasn't already done this.
                 */

                if(t < lct + lp_machine_password_timeout()) {
                        global_machine_password_needs_changing = False;
                        secrets_lock_trust_account_password(lp_workgroup(), False);
                        return True;
                }

                /* always just contact the PDC here */
    
                change_trust_account_password( lp_workgroup(), NULL);
                global_machine_password_needs_changing = False;
                secrets_lock_trust_account_password(lp_workgroup(), False);
        }

        /*
         * Check to see if we have any blocking locks
         * outstanding on the queue.
         */
        process_blocking_lock_queue();

        /* update printer queue caches if necessary */
  
        update_monitored_printq_cache();
  
        /*
         * Now we are root, check if the log files need pruning.
         * Force a log file check.
         */
        force_check_log_size();
        check_log_size();

        /* Send any queued printer notify message to interested smbd's. */

        print_notify_send_messages(0);

        /*
         * Modify the select timeout depending upon
         * what we have remaining in our queues.
         */

        *select_timeout = setup_select_timeout();

        return True;
}

char* get_InBuffer

(

void

)

process.c の 1479 行で定義されています。

参照先 InBuffer.

参照元 exit_server_common().

{
        return InBuffer;
}

char* get_OutBuffer

(

void

)

process.c の 1484 行で定義されています。

参照先 OutBuffer.

参照元 blocking_lock_reply_error()・generic_blocking_lock_error()・process_trans2()・reply_lockingX_success().

{
        return OutBuffer;
}

static char* NewInBuffer

(

char **

old_inbuf

)

[static]

process.c の 1495 行で定義されています。

参照先 clobber_region()・InBuffer.

参照元 smbd_process().

{
        char *new_inbuf = (char *)SMB_MALLOC(total_buffer_size);
        if (!new_inbuf) {
                return NULL;
        }
        if (old_inbuf) {
                *old_inbuf = InBuffer;
        }
        InBuffer = new_inbuf;
#if defined(DEVELOPER)
        clobber_region(SAFE_STRING_FUNCTION_NAME, SAFE_STRING_LINE, InBuffer, total_buffer_size);
#endif
        return InBuffer;
}

static char* NewOutBuffer

(

char **

old_outbuf

)

[static]

process.c の 1515 行で定義されています。

参照先 clobber_region()・OutBuffer.

参照元 smbd_process().

{
        char *new_outbuf = (char *)SMB_MALLOC(total_buffer_size);
        if (!new_outbuf) {
                return NULL;
        }
        if (old_outbuf) {
                *old_outbuf = OutBuffer;
        }
        OutBuffer = new_outbuf;
#if defined(DEVELOPER)
        clobber_region(SAFE_STRING_FUNCTION_NAME, SAFE_STRING_LINE, OutBuffer, total_buffer_size);
#endif
        return OutBuffer;
}

void smbd_process

(

void

)

process.c の 1535 行で定義されています。

参照先 change_to_root_user()・check_log_size()・clobber_region()・errno・InBuffer・lp_TALLOC_FREE()・main_loop_TALLOC_FREE()・max_recv・need_to_check_log_size()・NewInBuffer()・NewOutBuffer()・OutBuffer・process_smb()・receive_message_or_smb()・run_events()・setup_select_timeout()・smb_echo_count・smbd_event_context()・timeout_processing().

参照元 main().

{
        time_t last_timeout_processing_time = time(NULL);
        unsigned int num_smbs = 0;

        /* Allocate the primary Inbut/Output buffers. */

        if ((NewInBuffer(NULL) == NULL) || (NewOutBuffer(NULL) == NULL)) 
                return;

        max_recv = MIN(lp_maxxmit(),BUFFER_SIZE);

        while (True) {
                int deadtime = lp_deadtime()*60;
                int select_timeout = setup_select_timeout();
                int num_echos;

                if (deadtime <= 0)
                        deadtime = DEFAULT_SMBD_TIMEOUT;

                errno = 0;      
                
                /* free up temporary memory */
                lp_TALLOC_FREE();
                main_loop_TALLOC_FREE();

                /* Did someone ask for immediate checks on things like blocking locks ? */
                if (select_timeout == 0) {
                        if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
                                return;
                        num_smbs = 0; /* Reset smb counter. */
                }

                run_events(smbd_event_context(), 0, NULL, NULL);

#if defined(DEVELOPER)
                clobber_region(SAFE_STRING_FUNCTION_NAME, SAFE_STRING_LINE, InBuffer, total_buffer_size);
#endif

                while (!receive_message_or_smb(InBuffer,BUFFER_SIZE+LARGE_WRITEX_HDR_SIZE,select_timeout)) {
                        if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
                                return;
                        num_smbs = 0; /* Reset smb counter. */
                }

                /*
                 * Ensure we do timeout processing if the SMB we just got was
                 * only an echo request. This allows us to set the select
                 * timeout in 'receive_message_or_smb()' to any value we like
                 * without worrying that the client will send echo requests
                 * faster than the select timeout, thus starving out the
                 * essential processing (change notify, blocking locks) that
                 * the timeout code does. JRA.
                 */ 
                num_echos = smb_echo_count;

                clobber_region(SAFE_STRING_FUNCTION_NAME, SAFE_STRING_LINE, OutBuffer, total_buffer_size);

                process_smb(InBuffer, OutBuffer);

                if (smb_echo_count != num_echos) {
                        if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
                                return;
                        num_smbs = 0; /* Reset smb counter. */
                }

                num_smbs++;

                /*
                 * If we are getting smb requests in a constant stream
                 * with no echos, make sure we attempt timeout processing
                 * every select_timeout milliseconds - but only check for this
                 * every 200 smb requests.
                 */
                
                if ((num_smbs % 200) == 0) {
                        time_t new_check_time = time(NULL);
                        if(new_check_time - last_timeout_processing_time >= (select_timeout/1000)) {
                                if(!timeout_processing( deadtime, &select_timeout, &last_timeout_processing_time))
                                        return;
                                num_smbs = 0; /* Reset smb counter. */
                                last_timeout_processing_time = new_check_time; /* Reset time. */
                        }
                }

                /* The timeout_processing function isn't run nearly
                   often enough to implement 'max log size' without
                   overrunning the size of the file by many megabytes.
                   This is especially true if we are running at debug
                   level 10.  Checking every 50 SMBs is a nice
                   tradeoff of performance vs log file size overrun. */

                if ((num_smbs % 50) == 0 && need_to_check_log_size()) {
                        change_to_root_user();
                        check_log_size();
                }
        }
}

---

変数

uint16 global_smbpid

process.c の 24 行で定義されています。

参照元 fcb_or_dos_open()・open_directory()・open_file()・open_file_stat()・switch_message().

int keepalive

loadparm.c の 82 行で定義されています。

参照元 timeout_processing().

struct auth_context* negprot_global_auth_context

negprot.c の 29 行で定義されています。

int smb_echo_count

reply.c の 33 行で定義されています。

参照元 reply_echo()・smbd_process().

char* InBuffer = NULL [static]

process.c の 29 行で定義されています。

参照元 get_current_mid()・get_InBuffer()・NewInBuffer()・smbd_process().

char* OutBuffer = NULL [static]

process.c の 30 行で定義されています。

参照元 get_OutBuffer()・NewOutBuffer()・smbd_process().

char* current_inbuf = NULL [static]

process.c の 31 行で定義されています。

参照元 push_deferred_smb_message()・switch_message().

int max_send = BUFFER_SIZE

process.c の 38 行で定義されています。

int max_recv = BUFFER_SIZE

process.c の 43 行で定義されています。

int last_message

server.c の 30 行で定義されています。

参照元 switch_message().

int smb_read_error

util_sock.c の 117 行で定義されています。

SIG_ATOMIC_T reload_after_sighup = 0

process.c の 47 行で定義されています。

SIG_ATOMIC_T got_sig_term = 0

process.c の 48 行で定義されています。

BOOL global_machine_password_needs_changing

secrets.c の 34 行で定義されています。

int max_send

process.c の 38 行で定義されています。

struct pending_message_list* deferred_open_queue [static]

process.c の 66 行で定義されています。

参照元 get_open_deferred_message()・open_was_deferred()・push_queued_message()・receive_message_or_smb()・remove_deferred_open_smb_message()・schedule_deferred_open_smb_message().

struct smb_message_struct smb_messages[256] [static]

参照元 smb_fn_name()・switch_message().

uint32 common_flags2 = FLAGS2_LONG_PATH_COMPONENTS|FLAGS2_32_BIT_ERROR_CODES [static]

process.c の 1110 行で定義されています。

const int total_buffer_size = (BUFFER_SIZE + LARGE_WRITEX_HDR_SIZE + SAFETY_MARGIN)

process.c の 1489 行で定義されています。

---