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