vfs_smb_traffic_analyzer.c: added function

[Samba/gebeck_regimport.git] / source3 / modules / vfs_smb_traffic_analyzer.c

/*
 * traffic-analyzer VFS module. Measure the smb traffic users create
 * on the net.
 *
 * Copyright (C) Holger Hetterich, 2008
 * Copyright (C) Jeremy Allison, 2008
 *
 * 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 "../lib/crypto/crypto.h"
#include "vfs_smb_traffic_analyzer.h"

/* abstraction for the send_over_network function */
enum sock_type {INTERNET_SOCKET = 0, UNIX_DOMAIN_SOCKET};

#define LOCAL_PATHNAME "/var/tmp/stadsocket"

static int vfs_smb_traffic_analyzer_debug_level = DBGC_VFS;

static enum sock_type smb_traffic_analyzer_connMode(vfs_handle_struct *handle)
{
        connection_struct *conn = handle->conn;
        const char *Mode;
        Mode=lp_parm_const_string(SNUM(conn), "smb_traffic_analyzer","mode", \
                        "internet_socket");
        if (strstr(Mode,"unix_domain_socket")) {
                return UNIX_DOMAIN_SOCKET;
        } else {
                return INTERNET_SOCKET;
        }
}


/* Connect to an internet socket */
static int smb_traffic_analyzer_connect_inet_socket(vfs_handle_struct *handle,
                                        const char *name, uint16_t port)
{
        /* Create a streaming Socket */
        int sockfd = -1;
        struct addrinfo hints;
        struct addrinfo *ailist = NULL;
        struct addrinfo *res = NULL;
        int ret;

        ZERO_STRUCT(hints);
        /* By default make sure it supports TCP. */
        hints.ai_socktype = SOCK_STREAM;
        hints.ai_flags = AI_ADDRCONFIG;

        ret = getaddrinfo(name,
                        NULL,
                        &hints,
                        &ailist);

        if (ret) {
                DEBUG(3,("smb_traffic_analyzer_connect_inet_socket: "
                        "getaddrinfo failed for name %s [%s]\n",
                        name,
                        gai_strerror(ret) ));
                return -1;
        }

        DEBUG(3,("smb_traffic_analyzer: Internet socket mode. Hostname: %s,"
                "Port: %i\n", name, port));

        for (res = ailist; res; res = res->ai_next) {
                struct sockaddr_storage ss;
                NTSTATUS status;

                if (!res->ai_addr || res->ai_addrlen == 0) {
                        continue;
                }

                ZERO_STRUCT(ss);
                memcpy(&ss, res->ai_addr, res->ai_addrlen);

                status = open_socket_out(&ss, port, 10000, &sockfd);
                if (NT_STATUS_IS_OK(status)) {
                        break;
                }
        }

        if (ailist) {
                freeaddrinfo(ailist);
        }

        if (sockfd == -1) {
                DEBUG(1, ("smb_traffic_analyzer: unable to create "
                        "socket, error is %s",
                        strerror(errno)));
                return -1;
        }

        return sockfd;
}

/* Connect to a unix domain socket */
static int smb_traffic_analyzer_connect_unix_socket(vfs_handle_struct *handle,
                                                const char *name)
{
        /* Create the socket to stad */
        int len, sock;
        struct sockaddr_un remote;

        DEBUG(7, ("smb_traffic_analyzer_connect_unix_socket: "
                        "Unix domain socket mode. Using %s\n",
                        name ));

        if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
                DEBUG(1, ("smb_traffic_analyzer_connect_unix_socket: "
                        "Couldn't create socket, "
                        "make sure stad is running!\n"));
                return -1;
        }
        remote.sun_family = AF_UNIX;
        strlcpy(remote.sun_path, name,
                    sizeof(remote.sun_path));
        len=strlen(remote.sun_path) + sizeof(remote.sun_family);
        if (connect(sock, (struct sockaddr *)&remote, len) == -1 ) {
                DEBUG(1, ("smb_traffic_analyzer_connect_unix_socket: "
                        "Could not connect to "
                        "socket, make sure\nstad is running!\n"));
                close(sock);
                return -1;
        }
        return sock;
}

/* Private data allowing shared connection sockets. */
struct refcounted_sock {
        struct refcounted_sock *next, *prev;
        char *name;
        uint16_t port;
        int sock;
        unsigned int ref_count;
};


/**
 * Encryption of a data block with AES
 * TALLOC_CTX *ctx      Talloc context to work on
 * const char *akey     128bit key for the encryption
 * const char *str      Data buffer to encrypt, \0 terminated
 * int *len             Will be set to the length of the
 *                      resulting data block
 * The caller has to take care for the memory
 * allocated on the context.
 */
static char *smb_traffic_analyzer_encrypt( TALLOC_CTX *ctx,
        const char *akey, const char *str, size_t *len)
{
        int s1,s2,h,d;
        AES_KEY key;
        char filler[17]= "................";
        char *output;
        char crypted[18];
        if (akey == NULL) return NULL;
        samba_AES_set_encrypt_key(akey, 128, &key);
        s1 = strlen(str) / 16;
        s2 = strlen(str) % 16;
        for (h = 0; h < s2; h++) *(filler+h)=*(str+(s1*16)+h);
        DEBUG(10, ("smb_traffic_analyzer_send_data_socket: created %s"
                " as filling block.\n", filler));
        output = talloc_array(ctx, char, (s1*16)+17 );
        d=0;
        for (h = 0; h < s1; h++) {
                samba_AES_encrypt(str+(16*h), crypted, &key);
                for (d = 0; d<16; d++) output[d+(16*h)]=crypted[d];
        }
        samba_AES_encrypt( str+(16*h), filler, &key );
        for (d = 0;d < 16; d++) output[d+(16*h)]=*(filler+d);
        *len = (s1*16)+16;
        return output;  
}

/**
 * Create a v2 header.
 * TALLLOC_CTX *ctx             Talloc context to work on
 * const char *state_flags      State flag string
 * int len                      length of the data block
 */
static char *smb_traffic_analyzer_create_header( TALLOC_CTX *ctx,
        const char *state_flags, size_t data_len)
{
        char *header = talloc_asprintf( ctx, "V2.%s%017u",
                                        state_flags, data_len);
        DEBUG(10, ("smb_traffic_analyzer_send_data_socket: created Header:\n"));
        dump_data(10, header, strlen(header));
        return header;
}


/**
 * Actually send header and data over the network
 * char *header         Header data
 * char *data           Data Block
 * int dlength          Length of data block
 * int socket
 */
static void smb_traffic_analyzer_write_data( char *header, char *data,
                        int dlength, int socket)
{
                int len = strlen(header);
                if (write_data( socket, header, len) != len) {
                        DEBUG(1, ("smb_traffic_analyzer_send_data_socket: "
                                                "error sending the header"
                                                " over the socket!\n"));
                }
                DEBUG(10,("smb_traffic_analyzer_write_data: sending data:\n"));
                dump_data( 10, data, dlength);

                if (write_data( socket, data, dlength) != dlength) {
                        DEBUG(1, ("smb_traffic_analyzer_write_data: "
                                "error sending crypted data to socket!\n"));
                }
}


/*
 * Anonymize a string if required.
 * TALLOC_CTX *ctx                      The talloc context to work on
 * const char *str                      The string to anonymize
 * vfs_handle_struct *handle            The handle struct to work on
 *
 * Returns a newly allocated string, either the anonymized one,
 * or a copy of const char *str. The caller has to take care for
 * freeing the allocated memory.
 */
static char *smb_traffic_analyzer_anonymize( TALLOC_CTX *ctx,
                                        const char *str,
                                        vfs_handle_struct *handle )
{
        const char *total_anonymization;
        const char *anon_prefix;
        char *output;
        total_anonymization=lp_parm_const_string(SNUM(handle->conn),
                                        "smb_traffic_analyzer",
                                        "total_anonymization", NULL);

        anon_prefix=lp_parm_const_string(SNUM(handle->conn),
                                        "smb_traffic_analyzer",
                                        "anonymize_prefix", NULL );
        if (anon_prefix != NULL) {
                if (total_anonymization != NULL) {
                        output = talloc_asprintf(ctx, "%s",
                                        anon_prefix);
                } else {
                output = talloc_asprintf(ctx, "%s%i", anon_prefix,
                                                str_checksum(str));
                }
        } else {
                output = talloc_asprintf(ctx, "%s", str);
        }

        return output;
}


/* The marshaller for the protocol version 2. */
static char *smb_traffic_analyzer_create_string( TALLOC_CTX *ctx,
        struct tm *tm, int seconds, vfs_handle_struct *handle, \
        char *username, int vfs_operation, int count, ... )
{
        
        va_list ap;
        char *arg = NULL;
        int len;
        char *header = NULL;
        char *buf = NULL;
        char *timestr = NULL;
        char *opstr = NULL;
        char *sidstr = NULL;
        char *usersid = NULL;
        /*
         * first create the data that is transfered with any VFS op
         * These are, in the following order:
         *(0) number of data to come [6 in v2.0]
         * 1.vfs_operation identifier
         * 2.username
         * 3.user-SID
         * 4.affected share
         * 5.domain
         * 6.timestamp
         */

        /* number of common data blocks to come */
        opstr = talloc_asprintf( ctx, "%i", SMBTA_COMMON_DATA_COUNT);
        len = strlen(opstr);
        buf = talloc_asprintf( ctx, "%04u%s", len, opstr);
        talloc_free(opstr);
        /* vfs operation identifier */
        opstr = talloc_asprintf( ctx, "%i", vfs_operation);
        len = strlen(opstr);
        buf = talloc_asprintf_append( buf, "%04u%s", len, opstr);
        talloc_free(opstr);
        /*
         * Handle anonymization. In protocol v2, we have to anonymize
         * both the SID and the username. The name is already
         * anonymized if needed, by the calling function.
         */
        usersid = dom_sid_string( ctx,
                &handle->conn->server_info->ptok->user_sids[0]);
        sidstr = smb_traffic_analyzer_anonymize(ctx, usersid, handle);
        talloc_free(usersid);
        /* username */
        len = strlen( username );
        buf = talloc_asprintf_append(buf, "%04u%s", len, username);
        /* user SID */
        len = strlen( sidstr );
        buf = talloc_asprintf_append(buf, "%04u%s", len, sidstr);
        talloc_free(sidstr);
        /* affected share */
        len = strlen( handle->conn->connectpath );
        buf = talloc_asprintf_append( buf, "%04u%s", len, \
                handle->conn->connectpath );
        /* user's domain */
        len = strlen( pdb_get_domain(handle->conn->server_info->sam_account) );
        buf = talloc_asprintf_append( buf, "%04u%s", len, \
                pdb_get_domain(handle->conn->server_info->sam_account) );
        /* time stamp */
        timestr = talloc_asprintf( ctx, \
                "%04d-%02d-%02d %02d:%02d:%02d.%03d", \
                tm->tm_year+1900, \
                tm->tm_mon+1, \
                tm->tm_mday, \
                tm->tm_hour, \
                tm->tm_min, \
                tm->tm_sec, \
                (int)seconds);
        len = strlen( timestr );
        buf = talloc_asprintf_append( buf, "%04u%s", len, timestr);
        talloc_free(timestr);
        /* data blocks depending on the VFS function */ 
        va_start( ap, count );
        while ( count-- ) {
                arg = va_arg( ap, char * );
                /*
                 *  protocol v2 sends a four byte string
                 * as a header to each block, including
                 * the numbers of bytes to come in the
                 * next string.
                 */
                len = strlen( arg );
                buf = talloc_asprintf_append( buf, "%04u%s", len, arg);
        }
        va_end( ap );
        return buf;
}

static void smb_traffic_analyzer_send_data(vfs_handle_struct *handle,
                                        void *data,
                                        enum vfs_id vfs_operation )
{
        struct refcounted_sock *rf_sock = NULL;
        struct timeval tv;
        time_t tv_sec;
        struct tm *tm = NULL;
        int seconds;
        char *str = NULL;
        char *username = NULL;
        char *header = NULL;
        const char *protocol_version = NULL;
        bool Write = false;
        size_t len;

        /*
         * The state flags are part of the header
         * and are descripted in the protocol description
         * in vfs_smb_traffic_analyzer.h. They begin at byte
         * 03 of the header.
         */
        char state_flags[9] = "000000\0";

        SMB_VFS_HANDLE_GET_DATA(handle, rf_sock, struct refcounted_sock, return);

        if (rf_sock == NULL || rf_sock->sock == -1) {
                DEBUG(1, ("smb_traffic_analyzer_send_data: socket is "
                        "closed\n"));
                return;
        }

        GetTimeOfDay(&tv);
        tv_sec = convert_timespec_to_time_t(convert_timeval_to_timespec(tv));
        tm = localtime(&tv_sec);
        if (!tm) {
                return;
        }
        seconds=(float) (tv.tv_usec / 1000);

        /*
         * Check if anonymization is required, and if yes do this only for
         * the username here, needed vor protocol version 1. In v2 we
         * additionally anonymize the SID, which is done in it's marshalling
         * function.
         */
        username = smb_traffic_analyzer_anonymize( talloc_tos(),
                        handle->conn->server_info->sanitized_username,
                        handle);

        if (!username) {
                return;
        }

        protocol_version = lp_parm_const_string(SNUM(handle->conn),
                                        "smb_traffic_analyzer",
                                        "protocol_version", NULL );


        if ( protocol_version == NULL || strcmp( protocol_version,"V1") == 0) {

                struct rw_data *s_data = (struct rw_data *) data;

                /*
                 * in case of protocol v1, ignore any vfs operations
                 * except read,pread,write,pwrite, and set the "Write"
                 * bool accordingly, send data and return.
                 */
                if ( vfs_operation > vfs_id_pwrite ) return;

                if ( vfs_operation <= vfs_id_pread ) Write=false;
                        else Write=true;

                str = talloc_asprintf(talloc_tos(),
                        "V1,%u,\"%s\",\"%s\",\"%c\",\"%s\",\"%s\","
                        "\"%04d-%02d-%02d %02d:%02d:%02d.%03d\"\n",
                        (unsigned int) s_data->len,
                        username,
                        pdb_get_domain(handle->conn->server_info->sam_account),
                        Write ? 'W' : 'R',
                        handle->conn->connectpath,
                        s_data->filename,
                        tm->tm_year+1900,
                        tm->tm_mon+1,
                        tm->tm_mday,
                        tm->tm_hour,
                        tm->tm_min,
                        tm->tm_sec,
                        (int)seconds);
                if (write_data(rf_sock->sock, str, len) != len) {
                        DEBUG(1, ("smb_traffic_analyzer_send_data_socket: "
                        "error sending V1 protocol data to socket!\n"));
                return;
                }

        } else if ( strcmp( protocol_version, "V2") == 0) {

                switch( vfs_operation ) {
                case vfs_id_mkdir: ;
                        str = smb_traffic_analyzer_create_string( talloc_tos(),
                                tm, seconds, handle, username, vfs_id_mkdir, \
                                3, ((struct mkdir_data *) data)->path, \
                                talloc_asprintf( talloc_tos(), "%u", \
                                ((struct mkdir_data *) data)->mode), \
                                talloc_asprintf( talloc_tos(), "%u", \
                                ((struct mkdir_data *) data)->result ));
                        break;
                case vfs_id_rmdir: ;
                        str = smb_traffic_analyzer_create_string( talloc_tos(),
                                tm, seconds, handle, username, vfs_id_rmdir,
                                2, ((struct rmdir_data *) data)->path, \
                                talloc_asprintf( talloc_tos(), "%u", \
                                ((struct rmdir_data *) data)->result ));
                        break;
                case vfs_id_rename: ;
                        str = smb_traffic_analyzer_create_string( talloc_tos(),
                                tm, seconds, handle, username, vfs_id_rename,
                                3, ((struct rename_data *) data)->src, \
                                ((struct rename_data *) data)->dst,
                                talloc_asprintf(talloc_tos(), "%u", \
                                ((struct rename_data *) data)->result));
                        break;
                case vfs_id_chdir: ;
                        str = smb_traffic_analyzer_create_string( talloc_tos(),
                                tm, seconds, handle, username, vfs_id_chdir,
                                2, ((struct chdir_data *) data)->path, \
                                talloc_asprintf(talloc_tos(), "%u", \
                                ((struct chdir_data *) data)->result));
                        break;

                case vfs_id_write:
                case vfs_id_pwrite:
                case vfs_id_read:
                case vfs_id_pread: ;
                        str = smb_traffic_analyzer_create_string( talloc_tos(),
                                tm, seconds, handle, username, vfs_operation,
                                2, ((struct rw_data *) data)->filename, \
                                talloc_asprintf(talloc_tos(), "%u", \
                                ((struct rw_data *) data)->len));
                        break;
                default:
                        DEBUG(1, ("smb_traffic_analyzer: error! "
                                "wrong VFS operation id detected!\n"));
                        return;
                }

        } else {
                DEBUG(1, ("smb_traffic_analyzer_send_data_socket: "
                        "error, unkown protocol given!\n"));
                return;
        }

        if (!str) {
                DEBUG(1, ("smb_traffic_analyzer_send_data: "
                        "unable to create string to send!\n"));
                return;
        }


        /*
         * If configured, optain the key and run AES encryption
         * over the data.
         */
        size_t size;
        become_root();
        char *akey = (char *) secrets_fetch("smb_traffic_analyzer_key", &size);
        unbecome_root();
        if ( akey != NULL ) {
                state_flags[2] = 'E';
                DEBUG(10, ("smb_traffic_analyzer_send_data_socket: a key was"
                        " found, encrypting data!\n"));
                char *output = smb_traffic_analyzer_encrypt( talloc_tos(),
                                                akey, str, &len);
                header = smb_traffic_analyzer_create_header( talloc_tos(),
                                                state_flags, len);

                DEBUG(10, ("smb_traffic_analyzer_send_data_socket:"
                        " header created for crypted data: %s\n", header));
                smb_traffic_analyzer_write_data(header, output, len,
                                                        rf_sock->sock);
                return;

        }

        len = strlen(str);
        header = smb_traffic_analyzer_create_header( talloc_tos(),
                                state_flags, len);
        smb_traffic_analyzer_write_data(header, str, strlen(str),
                                rf_sock->sock);

}

static struct refcounted_sock *sock_list;

static void smb_traffic_analyzer_free_data(void **pptr)
{
        struct refcounted_sock *rf_sock = *(struct refcounted_sock **)pptr;
        if (rf_sock == NULL) {
                return;
        }
        rf_sock->ref_count--;
        if (rf_sock->ref_count != 0) {
                return;
        }
        if (rf_sock->sock != -1) {
                close(rf_sock->sock);
        }
        DLIST_REMOVE(sock_list, rf_sock);
        TALLOC_FREE(rf_sock);
}

static int smb_traffic_analyzer_connect(struct vfs_handle_struct *handle,
                         const char *service,
                         const char *user)
{
        connection_struct *conn = handle->conn;
        enum sock_type st = smb_traffic_analyzer_connMode(handle);
        struct refcounted_sock *rf_sock = NULL;
        const char *name = (st == UNIX_DOMAIN_SOCKET) ? LOCAL_PATHNAME :
                                lp_parm_const_string(SNUM(conn),
                                        "smb_traffic_analyzer",
                                "host", "localhost");
        uint16_t port = (st == UNIX_DOMAIN_SOCKET) ? 0 :
                                atoi( lp_parm_const_string(SNUM(conn),
                                "smb_traffic_analyzer", "port", "9430"));
        int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);

        if (ret < 0) {
                return ret;
        }

        /* Are we already connected ? */
        for (rf_sock = sock_list; rf_sock; rf_sock = rf_sock->next) {
                if (port == rf_sock->port &&
                                (strcmp(name, rf_sock->name) == 0)) {
                        break;
                }
        }

        /* If we're connected already, just increase the
         * reference count. */
        if (rf_sock) {
                rf_sock->ref_count++;
        } else {
                /* New connection. */
                rf_sock = TALLOC_ZERO_P(NULL, struct refcounted_sock);
                if (rf_sock == NULL) {
                        SMB_VFS_NEXT_DISCONNECT(handle);
                        errno = ENOMEM;
                        return -1;
                }
                rf_sock->name = talloc_strdup(rf_sock, name);
                if (rf_sock->name == NULL) {
                        SMB_VFS_NEXT_DISCONNECT(handle);
                        TALLOC_FREE(rf_sock);
                        errno = ENOMEM;
                        return -1;
                }
                rf_sock->port = port;
                rf_sock->ref_count = 1;

                if (st == UNIX_DOMAIN_SOCKET) {
                        rf_sock->sock = smb_traffic_analyzer_connect_unix_socket(handle,
                                                        name);
                } else {

                        rf_sock->sock = smb_traffic_analyzer_connect_inet_socket(handle,
                                                        name,
                                                        port);
                }
                if (rf_sock->sock == -1) {
                        SMB_VFS_NEXT_DISCONNECT(handle);
                        TALLOC_FREE(rf_sock);
                        return -1;
                }
                DLIST_ADD(sock_list, rf_sock);
        }

        /* Store the private data. */
        SMB_VFS_HANDLE_SET_DATA(handle, rf_sock, smb_traffic_analyzer_free_data,
                                struct refcounted_sock, return -1);
        return 0;
}

/* VFS Functions */
static int smb_traffic_analyzer_chdir(vfs_handle_struct *handle, \
                        const char *path)
{
        struct chdir_data s_data;
        s_data.result = SMB_VFS_NEXT_CHDIR(handle, path);
        s_data.path = path;
        DEBUG(10, ("smb_traffic_analyzer_chdir: CHDIR: %s\n", path));
        smb_traffic_analyzer_send_data(handle, &s_data, vfs_id_chdir);
        return s_data.result;
}

static int smb_traffic_analyzer_rename(vfs_handle_struct *handle, \
                const struct smb_filename *smb_fname_src,
                const struct smb_filename *smb_fname_dst)
{
        struct rename_data s_data;
        s_data.result = SMB_VFS_NEXT_RENAME(handle, smb_fname_src, \
                smb_fname_dst);
        s_data.src = smb_fname_src->base_name;
        s_data.dst = smb_fname_dst->base_name;
        DEBUG(10, ("smb_traffic_analyzer_rename: RENAME: %s / %s\n",
                smb_fname_src->base_name,
                smb_fname_dst->base_name));
        smb_traffic_analyzer_send_data(handle, &s_data, vfs_id_rename);
        return s_data.result;
}

static int smb_traffic_analyzer_rmdir(vfs_handle_struct *handle, \
                        const char *path)
{
        struct rmdir_data s_data;
        s_data.result = SMB_VFS_NEXT_RMDIR(handle, path);
        s_data.path = path;
        DEBUG(10, ("smb_traffic_analyzer_rmdir: RMDIR: %s\n", path));
        smb_traffic_analyzer_send_data(handle, &s_data, vfs_id_rmdir);
        return s_data.result;
}

static int smb_traffic_analyzer_mkdir(vfs_handle_struct *handle, \
                        const char *path, mode_t mode)
{
        struct mkdir_data s_data;
        s_data.result = SMB_VFS_NEXT_MKDIR(handle, path, mode);
        s_data.path = path;
        s_data.mode = mode;
        DEBUG(10, ("smb_traffic_analyzer_mkdir: MKDIR: %s\n", path));
        smb_traffic_analyzer_send_data(handle,
                        &s_data,
                        vfs_id_mkdir);
        return s_data.result;
}

static ssize_t smb_traffic_analyzer_read(vfs_handle_struct *handle, \
                                files_struct *fsp, void *data, size_t n)
{
        struct rw_data s_data;

        s_data.len = SMB_VFS_NEXT_READ(handle, fsp, data, n);
        s_data.filename = fsp->fsp_name->base_name;
        DEBUG(10, ("smb_traffic_analyzer_read: READ: %s\n", fsp_str_dbg(fsp)));

        smb_traffic_analyzer_send_data(handle,
                        &s_data,
                        vfs_id_read);
        return s_data.len;
}


static ssize_t smb_traffic_analyzer_pread(vfs_handle_struct *handle, \
                files_struct *fsp, void *data, size_t n, SMB_OFF_T offset)
{
        struct rw_data s_data;

        s_data.len = SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
        s_data.filename = fsp->fsp_name->base_name;
        DEBUG(10, ("smb_traffic_analyzer_pread: PREAD: %s\n",
                   fsp_str_dbg(fsp)));

        smb_traffic_analyzer_send_data(handle,
                        &s_data,
                        vfs_id_pread);

        return s_data.len;
}

static ssize_t smb_traffic_analyzer_write(vfs_handle_struct *handle, \
                        files_struct *fsp, const void *data, size_t n)
{
        struct rw_data s_data;

        s_data.len = SMB_VFS_NEXT_WRITE(handle, fsp, data, n);
        s_data.filename = fsp->fsp_name->base_name;
        DEBUG(10, ("smb_traffic_analyzer_write: WRITE: %s\n",
                   fsp_str_dbg(fsp)));

        smb_traffic_analyzer_send_data(handle,
                        &s_data,
                        vfs_id_write);
        return s_data.len;
}

static ssize_t smb_traffic_analyzer_pwrite(vfs_handle_struct *handle, \
             files_struct *fsp, const void *data, size_t n, SMB_OFF_T offset)
{
        struct rw_data s_data;

        s_data.len = SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
        s_data.filename = fsp->fsp_name->base_name;
        DEBUG(10, ("smb_traffic_analyzer_pwrite: PWRITE: %s\n", \
                fsp_str_dbg(fsp)));

        smb_traffic_analyzer_send_data(handle,
                        &s_data,
                        vfs_id_pwrite);
        return s_data.len;
}

static struct vfs_fn_pointers vfs_smb_traffic_analyzer_fns = {
        .connect_fn = smb_traffic_analyzer_connect,
        .vfs_read = smb_traffic_analyzer_read,
        .pread = smb_traffic_analyzer_pread,
        .write = smb_traffic_analyzer_write,
        .pwrite = smb_traffic_analyzer_pwrite,
        .mkdir = smb_traffic_analyzer_mkdir,
        .rename = smb_traffic_analyzer_rename,
        .chdir = smb_traffic_analyzer_chdir
};

/* Module initialization */
NTSTATUS vfs_smb_traffic_analyzer_init(void)
{
        NTSTATUS ret = smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
                                        "smb_traffic_analyzer",
                                        &vfs_smb_traffic_analyzer_fns);

        if (!NT_STATUS_IS_OK(ret)) {
                return ret;
        }

        vfs_smb_traffic_analyzer_debug_level =
                debug_add_class("smb_traffic_analyzer");

        if (vfs_smb_traffic_analyzer_debug_level == -1) {
                vfs_smb_traffic_analyzer_debug_level = DBGC_VFS;
                DEBUG(1, ("smb_traffic_analyzer_init: Couldn't register custom"
                         "debugging class!\n"));
        } else {
                DEBUG(3, ("smb_traffic_analyzer_init: Debug class number of"
                        "'smb_traffic_analyzer': %d\n", \
                        vfs_smb_traffic_analyzer_debug_level));
        }

        return ret;
}