source/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 enum sock_type {INTERNET_SOCKET = 0, UNIX_DOMAIN_SOCKET};
  26
  27 #define LOCAL_PATHNAME "/var/tmp/stadsocket"
  28
  29 extern userdom_struct current_user_info;
  30
  31 static int vfs_smb_traffic_analyzer_debug_level = DBGC_VFS;
  32
  33 static enum sock_type smb_traffic_analyzer_connMode(vfs_handle_struct *handle)
  34 {
  35         connection_struct *conn = handle->conn;
  36         const char *Mode;
  37         Mode=lp_parm_const_string(SNUM(conn), "smb_traffic_analyzer","mode", \
  38                         "internet_socket");
  39         if (strstr(Mode,"unix_domain_socket")) {
  40                 return UNIX_DOMAIN_SOCKET;
  41         } else {
  42                 return INTERNET_SOCKET;
  43         }
  44 }
  45
  46
  47 /* Connect to an internet socket */
  48
  49 static int smb_traffic_analyzer_connect_inet_socket(vfs_handle_struct *handle,
  50                                         const char *name, uint16_t port)
  51 {
  52         /* Create a streaming Socket */
  53         int sockfd = -1;
  54         struct addrinfo hints;
  55         struct addrinfo *ailist = NULL;
  56         struct addrinfo *res = NULL;
  57         int ret;
  58
  59         ZERO_STRUCT(hints);
  60         /* By default make sure it supports TCP. */
  61         hints.ai_socktype = SOCK_STREAM;
  62         hints.ai_flags = AI_ADDRCONFIG;
  63
  64         ret = getaddrinfo(name,
  65                         NULL,
  66                         &hints,
  67                         &ailist);
  68
  69         if (ret) {
  70                 DEBUG(3,("smb_traffic_analyzer_connect_inet_socket: "
  71                         "getaddrinfo failed for name %s [%s]\n",
  72                         name,
  73                         gai_strerror(ret) ));
  74                 return -1;
  75         }
  76
  77         DEBUG(3,("smb_traffic_analyzer: Internet socket mode. Hostname: %s,"
  78                 "Port: %i\n", name, port));
  79
  80         for (res = ailist; res; res = res->ai_next) {
  81                 struct sockaddr_storage ss;
  82
  83                 if (!res->ai_addr || res->ai_addrlen == 0) {
  84                         continue;
  85                 }
  86
  87                 ZERO_STRUCT(ss);
  88                 memcpy(&ss, res->ai_addr, res->ai_addrlen);
  89
  90                 sockfd = open_socket_out(SOCK_STREAM, &ss, port, 10000);
  91                 if (sockfd != -1) {
  92                         break;
  93                 }
  94         }
  95
  96         if (ailist) {
  97                 freeaddrinfo(ailist);
  98         }
  99
 100         if (sockfd == -1) {
 101                 DEBUG(1, ("smb_traffic_analyzer: unable to create "
 102                         "socket, error is %s",
 103                         strerror(errno)));
 104                 return -1;
 105         }
 106
 107         return sockfd;
 108 }
 109
 110 /* Connect to a unix domain socket */
 111
 112 static int smb_traffic_analyzer_connect_unix_socket(vfs_handle_struct *handle,
 113                                                 const char *name)
 114 {
 115         /* Create the socket to stad */
 116         int len, sock;
 117         struct sockaddr_un remote;
 118
 119         DEBUG(7, ("smb_traffic_analyzer_connect_unix_socket: "
 120                         "Unix domain socket mode. Using %s\n",
 121                         name ));
 122
 123         if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
 124                 DEBUG(1, ("smb_traffic_analyzer_connect_unix_socket: "
 125                         "Couldn't create socket, "
 126                         "make sure stad is running!\n"));
 127                 return -1;
 128         }
 129         remote.sun_family = AF_UNIX;
 130         strlcpy(remote.sun_path, name,
 131                     sizeof(remote.sun_path));
 132         len=strlen(remote.sun_path) + sizeof(remote.sun_family);
 133         if (connect(sock, (struct sockaddr *)&remote, len) == -1 ) {
 134                 DEBUG(1, ("smb_traffic_analyzer_connect_unix_socket: "
 135                         "Could not connect to "
 136                         "socket, make sure\nstad is running!\n"));
 137                 close(sock);
 138                 return -1;
 139         }
 140         return sock;
 141 }
 142
 143 /* Private data allowing shared connection sockets. */
 144
 145 struct refcounted_sock {
 146         struct refcounted_sock *next, *prev;
 147         char *name;
 148         uint16_t port;
 149         int sock;
 150         unsigned int ref_count;
 151 };
 152
 153 /* Send data over a socket */
 154
 155 static void smb_traffic_analyzer_send_data(vfs_handle_struct *handle,
 156                                         ssize_t result,
 157                                         const char *file_name,
 158                                         bool Write)
 159 {
 160         struct refcounted_sock *rf_sock = NULL;
 161         struct timeval tv;
 162         time_t tv_sec;
 163         struct tm *tm = NULL;
 164         int seconds;
 165         char *str = NULL;
 166         const char *username = NULL;
 167         const char *anon_prefix = NULL;
 168         size_t len;
 169
 170         SMB_VFS_HANDLE_GET_DATA(handle, rf_sock, struct refcounted_sock, return);
 171
 172         if (rf_sock == NULL || rf_sock->sock == -1) {
 173                 DEBUG(1, ("smb_traffic_analyzer_send_data: socket is "
 174                         "closed\n"));
 175                 return;
 176         }
 177
 178         GetTimeOfDay(&tv);
 179         tv_sec = convert_timespec_to_time_t(convert_timeval_to_timespec(tv));
 180         tm = localtime(&tv_sec);
 181         if (!tm) {
 182                 return;
 183         }
 184         seconds=(float) (tv.tv_usec / 1000);
 185
 186         /* check if anonymization is required */
 187
 188         anon_prefix=lp_parm_const_string(SNUM(handle->conn),"smb_traffic_analyzer",\
 189                                         "anonymize_prefix", NULL );
 190         if (anon_prefix!=NULL) {
 191                 username = talloc_asprintf(talloc_tos(),
 192                         "%s%i",
 193                         anon_prefix,
 194                         str_checksum(get_current_username()));
 195         } else {
 196                 username = get_current_username();
 197         }
 198
 199         if (!username) {
 200                 return;
 201         }
 202         str = talloc_asprintf(talloc_tos(),
 203                                 "V1,%u,\"%s\",\"%s\",\"%c\",\"%s\",\"%s\","
 204                                 "\"%04d-%02d-%02d %02d:%02d:%02d.%03d\"\n",
 205                                 (unsigned int)result,
 206                                 username,
 207                                 current_user_info.domain,
 208                                 Write ? 'W' : 'R',
 209                                 handle->conn->connectpath,
 210                                 file_name,
 211                                 tm->tm_year+1900,
 212                                 tm->tm_mon+1,
 213                                 tm->tm_mday,
 214                                 tm->tm_hour,
 215                                 tm->tm_min,
 216                                 tm->tm_sec,
 217                                 (int)seconds);
 218
 219         if (!str) {
 220                 return;
 221         }
 222
 223         len = strlen(str);
 224
 225         DEBUG(10, ("smb_traffic_analyzer_send_data_socket: sending %s\n",
 226                         str));
 227         if (write_data(rf_sock->sock, str, len) != len) {
 228                 DEBUG(1, ("smb_traffic_analyzer_send_data_socket: "
 229                         "error sending data to socket!\n"));
 230                 return ;
 231         }
 232 }
 233
 234 static struct refcounted_sock *sock_list;
 235
 236 static void smb_traffic_analyzer_free_data(void **pptr)
 237 {
 238         struct refcounted_sock *rf_sock = *(struct refcounted_sock **)pptr;
 239         if (rf_sock == NULL) {
 240                 return;
 241         }
 242         rf_sock->ref_count--;
 243         if (rf_sock->ref_count != 0) {
 244                 return;
 245         }
 246         if (rf_sock->sock != -1) {
 247                 close(rf_sock->sock);
 248         }
 249         DLIST_REMOVE(sock_list, rf_sock);
 250         TALLOC_FREE(rf_sock);
 251 }
 252
 253 static int smb_traffic_analyzer_connect(struct vfs_handle_struct *handle,
 254                          const char *service,
 255                          const char *user)
 256 {
 257         connection_struct *conn = handle->conn;
 258         enum sock_type st = smb_traffic_analyzer_connMode(handle);
 259         struct refcounted_sock *rf_sock = NULL;
 260         const char *name = (st == UNIX_DOMAIN_SOCKET) ? LOCAL_PATHNAME :
 261                                 lp_parm_const_string(SNUM(conn),
 262                                         "smb_traffic_analyzer",
 263                                 "host", "localhost");
 264         uint16_t port = (st == UNIX_DOMAIN_SOCKET) ? 0 :
 265                                 atoi( lp_parm_const_string(SNUM(conn),
 266                                 "smb_traffic_analyzer", "port", "9430"));
 267
 268         /* Are we already connected ? */
 269         for (rf_sock = sock_list; rf_sock; rf_sock = rf_sock->next) {
 270                 if (port == rf_sock->port &&
 271                                 (strcmp(name, rf_sock->name) == 0)) {
 272                         break;
 273                 }
 274         }
 275
 276         /* If we're connected already, just increase the
 277          * reference count. */
 278         if (rf_sock) {
 279                 rf_sock->ref_count++;
 280         } else {
 281                 /* New connection. */
 282                 rf_sock = TALLOC_ZERO_P(NULL, struct refcounted_sock);
 283                 if (rf_sock == NULL) {
 284                         errno = ENOMEM;
 285                         return -1;
 286                 }
 287                 rf_sock->name = talloc_strdup(rf_sock, name);
 288                 if (rf_sock->name == NULL) {
 289                         TALLOC_FREE(rf_sock);
 290                         errno = ENOMEM;
 291                         return -1;
 292                 }
 293                 rf_sock->port = port;
 294                 rf_sock->ref_count = 1;
 295
 296                 if (st == UNIX_DOMAIN_SOCKET) {
 297                         rf_sock->sock = smb_traffic_analyzer_connect_unix_socket(handle,
 298                                                         name);
 299                 } else {
 300
 301                         rf_sock->sock = smb_traffic_analyzer_connect_inet_socket(handle,
 302                                                         name,
 303                                                         port);
 304                 }
 305                 if (rf_sock->sock == -1) {
 306                         TALLOC_FREE(rf_sock);
 307                         return -1;
 308                 }
 309                 DLIST_ADD(sock_list, rf_sock);
 310         }
 311
 312         /* Store the private data. */
 313         SMB_VFS_HANDLE_SET_DATA(handle, rf_sock, smb_traffic_analyzer_free_data,
 314                                 struct refcounted_sock, return -1);
 315         return SMB_VFS_NEXT_CONNECT(handle, service, user);
 316 }
 317
 318 /* VFS Functions: write, read, pread, pwrite for now */
 319
 320 static ssize_t smb_traffic_analyzer_read(vfs_handle_struct *handle, \
 321                                 files_struct *fsp, void *data, size_t n)
 322 {
 323         ssize_t result;
 324
 325         result = SMB_VFS_NEXT_READ(handle, fsp, data, n);
 326         DEBUG(10, ("smb_traffic_analyzer_read: READ: %s\n", fsp->fsp_name ));
 327
 328         smb_traffic_analyzer_send_data(handle,
 329                         result,
 330                         fsp->fsp_name,
 331                         false);
 332         return result;
 333 }
 334
 335
 336 static ssize_t smb_traffic_analyzer_pread(vfs_handle_struct *handle, \
 337                 files_struct *fsp, void *data, size_t n, SMB_OFF_T offset)
 338 {
 339         ssize_t result;
 340
 341         result = SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
 342
 343         DEBUG(10, ("smb_traffic_analyzer_pread: PREAD: %s\n", fsp->fsp_name ));
 344
 345         smb_traffic_analyzer_send_data(handle,
 346                         result,
 347                         fsp->fsp_name,
 348                         false);
 349
 350         return result;
 351 }
 352
 353 static ssize_t smb_traffic_analyzer_write(vfs_handle_struct *handle, \
 354                         files_struct *fsp, const void *data, size_t n)
 355 {
 356         ssize_t result;
 357
 358         result = SMB_VFS_NEXT_WRITE(handle, fsp, data, n);
 359
 360         DEBUG(10, ("smb_traffic_analyzer_write: WRITE: %s\n", fsp->fsp_name ));
 361
 362         smb_traffic_analyzer_send_data(handle,
 363                         result,
 364                         fsp->fsp_name,
 365                         true);
 366         return result;
 367 }
 368
 369 static ssize_t smb_traffic_analyzer_pwrite(vfs_handle_struct *handle, \
 370              files_struct *fsp, const void *data, size_t n, SMB_OFF_T offset)
 371 {
 372         ssize_t result;
 373
 374         result = SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
 375
 376         DEBUG(10, ("smb_traffic_analyzer_pwrite: PWRITE: %s\n", fsp->fsp_name ));
 377
 378         smb_traffic_analyzer_send_data(handle,
 379                         result,
 380                         fsp->fsp_name,
 381                         true);
 382         return result;
 383 }
 384
 385 /* VFS operations we use */
 386
 387 static vfs_op_tuple smb_traffic_analyzer_tuples[] = {
 388
 389         {SMB_VFS_OP(smb_traffic_analyzer_connect), SMB_VFS_OP_CONNECT,
 390          SMB_VFS_LAYER_LOGGER},
 391         {SMB_VFS_OP(smb_traffic_analyzer_read), SMB_VFS_OP_READ,
 392          SMB_VFS_LAYER_LOGGER},
 393         {SMB_VFS_OP(smb_traffic_analyzer_pread), SMB_VFS_OP_PREAD,
 394          SMB_VFS_LAYER_LOGGER},
 395         {SMB_VFS_OP(smb_traffic_analyzer_write), SMB_VFS_OP_WRITE,
 396          SMB_VFS_LAYER_LOGGER},
 397         {SMB_VFS_OP(smb_traffic_analyzer_pwrite), SMB_VFS_OP_PWRITE,
 398          SMB_VFS_LAYER_LOGGER},
 399         {SMB_VFS_OP(NULL),SMB_VFS_OP_NOOP,SMB_VFS_LAYER_NOOP}
 400 };
 401
 402 /* Module initialization */
 403
 404 NTSTATUS vfs_smb_traffic_analyzer_init(void)
 405 {
 406         NTSTATUS ret = smb_register_vfs(SMB_VFS_INTERFACE_VERSION, \
 407                 "smb_traffic_analyzer", smb_traffic_analyzer_tuples);
 408
 409         if (!NT_STATUS_IS_OK(ret)) {
 410                 return ret;
 411         }
 412
 413         vfs_smb_traffic_analyzer_debug_level =
 414                 debug_add_class("smb_traffic_analyzer");
 415
 416         if (vfs_smb_traffic_analyzer_debug_level == -1) {
 417                 vfs_smb_traffic_analyzer_debug_level = DBGC_VFS;
 418                 DEBUG(1, ("smb_traffic_analyzer_init: Couldn't register custom"
 419                          "debugging class!\n"));
 420         } else {
 421                 DEBUG(3, ("smb_traffic_analyzer_init: Debug class number of"
 422                         "'smb_traffic_analyzer': %d\n", \
 423                         vfs_smb_traffic_analyzer_debug_level));
 424         }
 425
 426         return ret;
 427 }