source3/modules/vfs_smb_traffic_analyzer.c

   1 /*
   2  * traffic-analyzer VFS module. Measure the smb traffic users create
   3  * on the net.
   4  *
   5  * Copyright (C) Holger Hetterich, 2008
   6  * Copyright (C) Jeremy Allison, 2008
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "includes.h"
  23
  24 /* abstraction for the send_over_network function */
  25
  26 enum sock_type {INTERNET_SOCKET = 0, UNIX_DOMAIN_SOCKET};
  27
  28 #define LOCAL_PATHNAME "/var/tmp/stadsocket"
  29
  30 /* VFS Functions identifier table. In protocol version 2, every vfs     */
  31 /* function is given a unique id.                                       */
  32 enum vfs_id {
  33         /* care for the order here, required for compatibility  */
  34         /* with protocol version 1.                             */
  35         vfs_id_read,
  36         vfs_id_pread,
  37         vfs_id_write,
  38         vfs_id_pwrite,
  39         /* end of protocol version 1 identifiers.               */
  40         vfs_id_mkdir
  41 };
  42
  43 /* Specific data sets for the VFS functions.                            */
  44
  45 struct mkdir_data {
  46         const char *path;
  47         mode_t mode;
  48         int result;
  49 };
  50
  51 /* rw_data used for read/write/pread/pwrite                             */
  52 struct rw_data {
  53         char *filename;
  54         size_t len;
  55 };
  56
  57
  58 static int vfs_smb_traffic_analyzer_debug_level = DBGC_VFS;
  59
  60 static enum sock_type smb_traffic_analyzer_connMode(vfs_handle_struct *handle)
  61 {
  62         connection_struct *conn = handle->conn;
  63         const char *Mode;
  64         Mode=lp_parm_const_string(SNUM(conn), "smb_traffic_analyzer","mode", \
  65                         "internet_socket");
  66         if (strstr(Mode,"unix_domain_socket")) {
  67                 return UNIX_DOMAIN_SOCKET;
  68         } else {
  69                 return INTERNET_SOCKET;
  70         }
  71 }
  72
  73
  74 /* Connect to an internet socket */
  75
  76 static int smb_traffic_analyzer_connect_inet_socket(vfs_handle_struct *handle,
  77                                         const char *name, uint16_t port)
  78 {
  79         /* Create a streaming Socket */
  80         int sockfd = -1;
  81         struct addrinfo hints;
  82         struct addrinfo *ailist = NULL;
  83         struct addrinfo *res = NULL;
  84         int ret;
  85
  86         ZERO_STRUCT(hints);
  87         /* By default make sure it supports TCP. */
  88         hints.ai_socktype = SOCK_STREAM;
  89         hints.ai_flags = AI_ADDRCONFIG;
  90
  91         ret = getaddrinfo(name,
  92                         NULL,
  93                         &hints,
  94                         &ailist);
  95
  96         if (ret) {
  97                 DEBUG(3,("smb_traffic_analyzer_connect_inet_socket: "
  98                         "getaddrinfo failed for name %s [%s]\n",
  99                         name,
 100                         gai_strerror(ret) ));
 101                 return -1;
 102         }
 103
 104         DEBUG(3,("smb_traffic_analyzer: Internet socket mode. Hostname: %s,"
 105                 "Port: %i\n", name, port));
 106
 107         for (res = ailist; res; res = res->ai_next) {
 108                 struct sockaddr_storage ss;
 109                 NTSTATUS status;
 110
 111                 if (!res->ai_addr || res->ai_addrlen == 0) {
 112                         continue;
 113                 }
 114
 115                 ZERO_STRUCT(ss);
 116                 memcpy(&ss, res->ai_addr, res->ai_addrlen);
 117
 118                 status = open_socket_out(&ss, port, 10000, &sockfd);
 119                 if (NT_STATUS_IS_OK(status)) {
 120                         break;
 121                 }
 122         }
 123
 124         if (ailist) {
 125                 freeaddrinfo(ailist);
 126         }
 127
 128         if (sockfd == -1) {
 129                 DEBUG(1, ("smb_traffic_analyzer: unable to create "
 130                         "socket, error is %s",
 131                         strerror(errno)));
 132                 return -1;
 133         }
 134
 135         return sockfd;
 136 }
 137
 138 /* Connect to a unix domain socket */
 139
 140 static int smb_traffic_analyzer_connect_unix_socket(vfs_handle_struct *handle,
 141                                                 const char *name)
 142 {
 143         /* Create the socket to stad */
 144         int len, sock;
 145         struct sockaddr_un remote;
 146
 147         DEBUG(7, ("smb_traffic_analyzer_connect_unix_socket: "
 148                         "Unix domain socket mode. Using %s\n",
 149                         name ));
 150
 151         if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
 152                 DEBUG(1, ("smb_traffic_analyzer_connect_unix_socket: "
 153                         "Couldn't create socket, "
 154                         "make sure stad is running!\n"));
 155                 return -1;
 156         }
 157         remote.sun_family = AF_UNIX;
 158         strlcpy(remote.sun_path, name,
 159                     sizeof(remote.sun_path));
 160         len=strlen(remote.sun_path) + sizeof(remote.sun_family);
 161         if (connect(sock, (struct sockaddr *)&remote, len) == -1 ) {
 162                 DEBUG(1, ("smb_traffic_analyzer_connect_unix_socket: "
 163                         "Could not connect to "
 164                         "socket, make sure\nstad is running!\n"));
 165                 close(sock);
 166                 return -1;
 167         }
 168         return sock;
 169 }
 170
 171 /* Private data allowing shared connection sockets. */
 172
 173 struct refcounted_sock {
 174         struct refcounted_sock *next, *prev;
 175         char *name;
 176         uint16_t port;
 177         int sock;
 178         unsigned int ref_count;
 179 };
 180
 181 /* Send data over a socket */
 182
 183 static void smb_traffic_analyzer_send_data(vfs_handle_struct *handle,
 184                                         void *data,
 185                                         enum vfs_id vfs_operation )
 186 {
 187         struct refcounted_sock *rf_sock = NULL;
 188         struct timeval tv;
 189         time_t tv_sec;
 190         struct tm *tm = NULL;
 191         int seconds;
 192         char *str = NULL;
 193         char *username = NULL;
 194         const char *anon_prefix = NULL;
 195         const char *total_anonymization = NULL;
 196         const char *protocol_version = NULL;
 197         bool Write = false;
 198         size_t len;
 199
 200         SMB_VFS_HANDLE_GET_DATA(handle, rf_sock, struct refcounted_sock, return);
 201
 202         if (rf_sock == NULL || rf_sock->sock == -1) {
 203                 DEBUG(1, ("smb_traffic_analyzer_send_data: socket is "
 204                         "closed\n"));
 205                 return;
 206         }
 207
 208         GetTimeOfDay(&tv);
 209         tv_sec = convert_timespec_to_time_t(convert_timeval_to_timespec(tv));
 210         tm = localtime(&tv_sec);
 211         if (!tm) {
 212                 return;
 213         }
 214         seconds=(float) (tv.tv_usec / 1000);
 215
 216         /* check if anonymization is required */
 217
 218         total_anonymization=lp_parm_const_string(SNUM(handle->conn),"smb_traffic_analyzer",
 219                                         "total_anonymization", NULL);
 220
 221         anon_prefix=lp_parm_const_string(SNUM(handle->conn),"smb_traffic_analyzer",\
 222                                         "anonymize_prefix", NULL );
 223         if (anon_prefix!=NULL) {
 224                 if (total_anonymization!=NULL) {
 225                         username = talloc_asprintf(talloc_tos(),
 226                                 "%s",
 227                                 anon_prefix);
 228                 } else {
 229                         username = talloc_asprintf(talloc_tos(),
 230                                 "%s%i",
 231                                 anon_prefix,
 232                                 str_checksum(
 233                                         handle->conn->server_info->sanitized_username ) );
 234                 }
 235
 236         } else {
 237                 username = handle->conn->server_info->sanitized_username;
 238         }
 239
 240         if (!username) {
 241                 return;
 242         }
 243
 244         protocol_version = lp_parm_const_string(SNUM(handle->conn),
 245                 "smb_traffic_analyzer",
 246                 "protocol_version", NULL );
 247
 248         if ( protocol_version == NULL || strcmp( protocol_version,"V1") == 0) {
 249
 250                 struct rw_data *s_data = (struct rw_data *) data;
 251
 252                 /* in case of protocol v1, ignore any vfs operations    */
 253                 /* except read,pread,write,pwrite, and set the "Write"  */
 254                 /* bool accordingly.                                    */
 255
 256                 if ( vfs_operation > vfs_id_pwrite ) return;
 257
 258                 if ( vfs_operation <= vfs_id_pread ) Write=false;
 259                         else Write=true;
 260
 261                 str = talloc_asprintf(talloc_tos(),
 262                         "V1,%u,\"%s\",\"%s\",\"%c\",\"%s\",\"%s\","
 263                         "\"%04d-%02d-%02d %02d:%02d:%02d.%03d\"\n",
 264                         (unsigned int) s_data->len,
 265                         username,
 266                         pdb_get_domain(handle->conn->server_info->sam_account),
 267                         Write ? 'W' : 'R',
 268                         handle->conn->connectpath,
 269                         s_data->filename,
 270                         tm->tm_year+1900,
 271                         tm->tm_mon+1,
 272                         tm->tm_mday,
 273                         tm->tm_hour,
 274                         tm->tm_min,
 275                         tm->tm_sec,
 276                         (int)seconds);
 277         } else if ( strcmp( protocol_version, "V2") == 0) {
 278                 /* protocol version 2   */
 279                 /* in development       */
 280         } else {
 281                 DEBUG(1, ("smb_traffic_analyzer_send_data_socket: "
 282                         "error, unkown protocol given!\n"));
 283                 return;
 284         }
 285
 286         if (!str) {
 287                 DEBUG(1, ("smb_traffic_analyzer_send_data: "
 288                         "unable to create string to send!\n"));
 289                 return;
 290         }
 291
 292         len = strlen(str);
 293
 294         DEBUG(10, ("smb_traffic_analyzer_send_data_socket: sending %s\n",
 295                         str));
 296         if (write_data(rf_sock->sock, str, len) != len) {
 297                 DEBUG(1, ("smb_traffic_analyzer_send_data_socket: "
 298                         "error sending data to socket!\n"));
 299                 return ;
 300         }
 301 }
 302
 303 static struct refcounted_sock *sock_list;
 304
 305 static void smb_traffic_analyzer_free_data(void **pptr)
 306 {
 307         struct refcounted_sock *rf_sock = *(struct refcounted_sock **)pptr;
 308         if (rf_sock == NULL) {
 309                 return;
 310         }
 311         rf_sock->ref_count--;
 312         if (rf_sock->ref_count != 0) {
 313                 return;
 314         }
 315         if (rf_sock->sock != -1) {
 316                 close(rf_sock->sock);
 317         }
 318         DLIST_REMOVE(sock_list, rf_sock);
 319         TALLOC_FREE(rf_sock);
 320 }
 321
 322 static int smb_traffic_analyzer_connect(struct vfs_handle_struct *handle,
 323                          const char *service,
 324                          const char *user)
 325 {
 326         connection_struct *conn = handle->conn;
 327         enum sock_type st = smb_traffic_analyzer_connMode(handle);
 328         struct refcounted_sock *rf_sock = NULL;
 329         const char *name = (st == UNIX_DOMAIN_SOCKET) ? LOCAL_PATHNAME :
 330                                 lp_parm_const_string(SNUM(conn),
 331                                         "smb_traffic_analyzer",
 332                                 "host", "localhost");
 333         uint16_t port = (st == UNIX_DOMAIN_SOCKET) ? 0 :
 334                                 atoi( lp_parm_const_string(SNUM(conn),
 335                                 "smb_traffic_analyzer", "port", "9430"));
 336         int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
 337
 338         if (ret < 0) {
 339                 return ret;
 340         }
 341
 342         /* Are we already connected ? */
 343         for (rf_sock = sock_list; rf_sock; rf_sock = rf_sock->next) {
 344                 if (port == rf_sock->port &&
 345                                 (strcmp(name, rf_sock->name) == 0)) {
 346                         break;
 347                 }
 348         }
 349
 350         /* If we're connected already, just increase the
 351          * reference count. */
 352         if (rf_sock) {
 353                 rf_sock->ref_count++;
 354         } else {
 355                 /* New connection. */
 356                 rf_sock = TALLOC_ZERO_P(NULL, struct refcounted_sock);
 357                 if (rf_sock == NULL) {
 358                         SMB_VFS_NEXT_DISCONNECT(handle);
 359                         errno = ENOMEM;
 360                         return -1;
 361                 }
 362                 rf_sock->name = talloc_strdup(rf_sock, name);
 363                 if (rf_sock->name == NULL) {
 364                         SMB_VFS_NEXT_DISCONNECT(handle);
 365                         TALLOC_FREE(rf_sock);
 366                         errno = ENOMEM;
 367                         return -1;
 368                 }
 369                 rf_sock->port = port;
 370                 rf_sock->ref_count = 1;
 371
 372                 if (st == UNIX_DOMAIN_SOCKET) {
 373                         rf_sock->sock = smb_traffic_analyzer_connect_unix_socket(handle,
 374                                                         name);
 375                 } else {
 376
 377                         rf_sock->sock = smb_traffic_analyzer_connect_inet_socket(handle,
 378                                                         name,
 379                                                         port);
 380                 }
 381                 if (rf_sock->sock == -1) {
 382                         SMB_VFS_NEXT_DISCONNECT(handle);
 383                         TALLOC_FREE(rf_sock);
 384                         return -1;
 385                 }
 386                 DLIST_ADD(sock_list, rf_sock);
 387         }
 388
 389         /* Store the private data. */
 390         SMB_VFS_HANDLE_SET_DATA(handle, rf_sock, smb_traffic_analyzer_free_data,
 391                                 struct refcounted_sock, return -1);
 392         return 0;
 393 }
 394
 395 /* VFS Functions */
 396
 397 static int smb_traffic_analyzer_mkdir(vfs_handle_struct *handle, \
 398                         const char *path, mode_t mode)
 399 {
 400         struct mkdir_data s_data;
 401         s_data.result = SMB_VFS_NEXT_MKDIR(handle, path, mode);
 402         s_data.path = path;
 403         s_data.mode = mode;
 404         DEBUG(10, ("smb_traffic_analyzer_mkdir: MKDIR: %s\n", path));
 405         smb_traffic_analyzer_send_data(handle,
 406                         &s_data,
 407                         vfs_id_mkdir);
 408         return s_data.result;
 409 }
 410
 411 static ssize_t smb_traffic_analyzer_read(vfs_handle_struct *handle, \
 412                                 files_struct *fsp, void *data, size_t n)
 413 {
 414         struct rw_data s_data;
 415
 416         s_data.len = SMB_VFS_NEXT_READ(handle, fsp, data, n);
 417         s_data.filename = fsp->fsp_name->base_name;
 418         DEBUG(10, ("smb_traffic_analyzer_read: READ: %s\n", fsp_str_dbg(fsp)));
 419
 420         smb_traffic_analyzer_send_data(handle,
 421                         &s_data,
 422                         vfs_id_read);
 423         return s_data.len;
 424 }
 425
 426
 427 static ssize_t smb_traffic_analyzer_pread(vfs_handle_struct *handle, \
 428                 files_struct *fsp, void *data, size_t n, SMB_OFF_T offset)
 429 {
 430         struct rw_data s_data;
 431
 432         s_data.len = SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
 433         s_data.filename = fsp->fsp_name->base_name;
 434         DEBUG(10, ("smb_traffic_analyzer_pread: PREAD: %s\n",
 435                    fsp_str_dbg(fsp)));
 436
 437         smb_traffic_analyzer_send_data(handle,
 438                         &s_data,
 439                         vfs_id_pread);
 440
 441         return s_data.len;
 442 }
 443
 444 static ssize_t smb_traffic_analyzer_write(vfs_handle_struct *handle, \
 445                         files_struct *fsp, const void *data, size_t n)
 446 {
 447         struct rw_data s_data;
 448
 449         s_data.len = SMB_VFS_NEXT_WRITE(handle, fsp, data, n);
 450         s_data.filename = fsp->fsp_name->base_name;
 451         DEBUG(10, ("smb_traffic_analyzer_write: WRITE: %s\n",
 452                    fsp_str_dbg(fsp)));
 453
 454         smb_traffic_analyzer_send_data(handle,
 455                         &s_data,
 456                         vfs_id_write);
 457         return s_data.len;
 458 }
 459
 460 static ssize_t smb_traffic_analyzer_pwrite(vfs_handle_struct *handle, \
 461              files_struct *fsp, const void *data, size_t n, SMB_OFF_T offset)
 462 {
 463         struct rw_data s_data;
 464
 465         s_data.len = SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
 466         s_data.filename = fsp->fsp_name->base_name;
 467         DEBUG(10, ("smb_traffic_analyzer_pwrite: PWRITE: %s\n", \
 468                 fsp_str_dbg(fsp)));
 469
 470         smb_traffic_analyzer_send_data(handle,
 471                         &s_data,
 472                         vfs_id_pwrite);
 473         return s_data.len;
 474 }
 475
 476 static struct vfs_fn_pointers vfs_smb_traffic_analyzer_fns = {
 477         .connect_fn = smb_traffic_analyzer_connect,
 478         .vfs_read = smb_traffic_analyzer_read,
 479         .pread = smb_traffic_analyzer_pread,
 480         .write = smb_traffic_analyzer_write,
 481         .pwrite = smb_traffic_analyzer_pwrite,
 482         .mkdir = smb_traffic_analyzer_mkdir
 483 };
 484
 485 /* Module initialization */
 486
 487 NTSTATUS vfs_smb_traffic_analyzer_init(void)
 488 {
 489         NTSTATUS ret = smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
 490                                         "smb_traffic_analyzer",
 491                                         &vfs_smb_traffic_analyzer_fns);
 492
 493         if (!NT_STATUS_IS_OK(ret)) {
 494                 return ret;
 495         }
 496
 497         vfs_smb_traffic_analyzer_debug_level =
 498                 debug_add_class("smb_traffic_analyzer");
 499
 500         if (vfs_smb_traffic_analyzer_debug_level == -1) {
 501                 vfs_smb_traffic_analyzer_debug_level = DBGC_VFS;
 502                 DEBUG(1, ("smb_traffic_analyzer_init: Couldn't register custom"
 503                          "debugging class!\n"));
 504         } else {
 505                 DEBUG(3, ("smb_traffic_analyzer_init: Debug class number of"
 506                         "'smb_traffic_analyzer': %d\n", \
 507                         vfs_smb_traffic_analyzer_debug_level));
 508         }
 509
 510         return ret;
 511 }