source3/printing/printspoolss.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Printing routines that bridge to spoolss
   4    Copyright (C) Simo Sorce 2010
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "printing.h"
  22 #include "rpc_client/rpc_client.h"
  23 #include "../librpc/gen_ndr/ndr_spoolss_c.h"
  24 #include "rpc_server/rpc_ncacn_np.h"
  25 #include "smbd/globals.h"
  26 #include "../libcli/security/security.h"
  27
  28 struct print_file_data {
  29         char *svcname;
  30         char *docname;
  31         char *filename;
  32         struct policy_handle handle;
  33         uint32_t jobid;
  34         uint16 rap_jobid;
  35 };
  36
  37 uint16_t print_spool_rap_jobid(struct print_file_data *print_file)
  38 {
  39         if (print_file == NULL) {
  40                 return 0;
  41         }
  42
  43         return print_file->rap_jobid;
  44 }
  45
  46 void print_spool_terminate(struct connection_struct *conn,
  47                            struct print_file_data *print_file);
  48
  49 /***************************************************************************
  50  * Open a Document over spoolss
  51  ***************************************************************************/
  52
  53 #define DOCNAME_DEFAULT "Remote Downlevel Document"
  54 #ifndef PRINT_SPOOL_PREFIX
  55 #define PRINT_SPOOL_PREFIX "smbprn."
  56 #endif
  57
  58 NTSTATUS print_spool_open(files_struct *fsp,
  59                           const char *fname,
  60                           uint64_t current_vuid)
  61 {
  62         NTSTATUS status;
  63         TALLOC_CTX *tmp_ctx;
  64         struct print_file_data *pf;
  65         struct dcerpc_binding_handle *b = NULL;
  66         struct spoolss_DevmodeContainer devmode_ctr;
  67         union spoolss_DocumentInfo info;
  68         int fd = -1;
  69         WERROR werr;
  70
  71         tmp_ctx = talloc_new(fsp);
  72         if (!tmp_ctx) {
  73                 return NT_STATUS_NO_MEMORY;
  74         }
  75
  76         pf = talloc_zero(fsp, struct print_file_data);
  77         if (!pf) {
  78                 status = NT_STATUS_NO_MEMORY;
  79                 goto done;
  80         }
  81         pf->svcname = talloc_strdup(pf, lp_servicename(SNUM(fsp->conn)));
  82
  83         /* the document name is derived from the file name.
  84          * "Remote Downlevel Document" is added in front to
  85          * mimic what windows does in this case */
  86         pf->docname = talloc_strdup(pf, DOCNAME_DEFAULT);
  87         if (!pf->docname) {
  88                 status = NT_STATUS_NO_MEMORY;
  89                 goto done;
  90         }
  91         if (fname) {
  92                 const char *p = strrchr(fname, '/');
  93                 if (!p) {
  94                         p = fname;
  95                 }
  96                 pf->docname = talloc_asprintf_append(pf->docname, " %s", p);
  97                 if (!pf->docname) {
  98                         status = NT_STATUS_NO_MEMORY;
  99                         goto done;
 100                 }
 101         }
 102
 103         /* Ok, now we have to open an actual file.
 104          * Here is the reason:
 105          * We want to write the spool job to this file in
 106          * smbd for scalability reason (and also because
 107          * apparently window printer drivers can seek when
 108          * spooling to a file).
 109          * So we first create a file, and then we pass it
 110          * to spoolss in output_file so it can monitor and
 111          * take over once we call EndDocPrinter().
 112          * Of course we will not start writing until
 113          * StartDocPrinter() actually gives the ok. */
 114
 115         pf->filename = talloc_asprintf(pf, "%s/%s.XXXXXX",
 116                                         lp_pathname(SNUM(fsp->conn)),
 117                                         PRINT_SPOOL_PREFIX);
 118         if (!pf->filename) {
 119                 status = NT_STATUS_NO_MEMORY;
 120                 goto done;
 121         }
 122         errno = 0;
 123         fd = mkstemp(pf->filename);
 124         if (fd == -1) {
 125                 if (errno == EACCES) {
 126                         /* Common setup error, force a report. */
 127                         DEBUG(0, ("Insufficient permissions "
 128                                   "to open spool file %s.\n",
 129                                   pf->filename));
 130                 } else {
 131                         /* Normal case, report at level 3 and above. */
 132                         DEBUG(3, ("can't open spool file %s,\n",
 133                                   pf->filename));
 134                         DEBUGADD(3, ("errno = %d (%s).\n",
 135                                      errno, strerror(errno)));
 136                 }
 137                 status = map_nt_error_from_unix(errno);
 138                 goto done;
 139         }
 140
 141         /* now open a document over spoolss so that it does
 142          * all printer verification, and eventually assigns
 143          * a job id */
 144
 145         status = rpc_pipe_open_interface(fsp->conn,
 146                                          &ndr_table_spoolss.syntax_id,
 147                                          fsp->conn->session_info,
 148                                          fsp->conn->sconn->remote_address,
 149                                          fsp->conn->sconn->msg_ctx,
 150                                          &fsp->conn->spoolss_pipe);
 151         if (!NT_STATUS_IS_OK(status)) {
 152                 goto done;
 153         }
 154         b = fsp->conn->spoolss_pipe->binding_handle;
 155
 156         ZERO_STRUCT(devmode_ctr);
 157
 158         status = dcerpc_spoolss_OpenPrinter(b, pf, pf->svcname,
 159                                             "RAW", devmode_ctr,
 160                                             SEC_FLAG_MAXIMUM_ALLOWED,
 161                                             &pf->handle, &werr);
 162         if (!NT_STATUS_IS_OK(status)) {
 163                 goto done;
 164         }
 165         if (!W_ERROR_IS_OK(werr)) {
 166                 status = werror_to_ntstatus(werr);
 167                 goto done;
 168         }
 169
 170         info.info1 = talloc(tmp_ctx, struct spoolss_DocumentInfo1);
 171         if (!info.info1) {
 172                 status = NT_STATUS_NO_MEMORY;
 173                 goto done;
 174         }
 175         info.info1->document_name = pf->docname;
 176         info.info1->output_file = pf->filename;
 177         info.info1->datatype = "RAW";
 178
 179         status = dcerpc_spoolss_StartDocPrinter(b, tmp_ctx, &pf->handle,
 180                                                 1, info, &pf->jobid, &werr);
 181         if (!NT_STATUS_IS_OK(status)) {
 182                 goto done;
 183         }
 184         if (!W_ERROR_IS_OK(werr)) {
 185                 status = werror_to_ntstatus(werr);
 186                 goto done;
 187         }
 188
 189         /* Convert to RAP id. */
 190         pf->rap_jobid = pjobid_to_rap(pf->svcname, pf->jobid);
 191         if (pf->rap_jobid == 0) {
 192                 /* No errno around here */
 193                 status = NT_STATUS_ACCESS_DENIED;
 194                 goto done;
 195         }
 196
 197         /* setup a full fsp */
 198         status = create_synthetic_smb_fname(fsp, pf->filename, NULL,
 199                                             NULL, &fsp->fsp_name);
 200         if (!NT_STATUS_IS_OK(status)) {
 201                 goto done;
 202         }
 203
 204         if (sys_fstat(fd, &fsp->fsp_name->st, false) != 0) {
 205                 status = map_nt_error_from_unix(errno);
 206                 goto done;
 207         }
 208
 209         fsp->file_id = vfs_file_id_from_sbuf(fsp->conn, &fsp->fsp_name->st);
 210         fsp->fh->fd = fd;
 211
 212         fsp->vuid = current_vuid;
 213         fsp->can_lock = false;
 214         fsp->can_read = false;
 215         fsp->access_mask = FILE_GENERIC_WRITE;
 216         fsp->can_write = true;
 217         fsp->modified = false;
 218         fsp->oplock_type = NO_OPLOCK;
 219         fsp->sent_oplock_break = NO_BREAK_SENT;
 220         fsp->is_directory = false;
 221
 222         fsp->print_file = pf;
 223
 224         status = NT_STATUS_OK;
 225 done:
 226         if (!NT_STATUS_IS_OK(status)) {
 227                 if (fd != -1) {
 228                         close(fd);
 229                         if (fsp->print_file) {
 230                                 unlink(fsp->print_file->filename);
 231                         }
 232                 }
 233                 /* We need to delete the job from spoolss too */
 234                 if (pf->jobid) {
 235                         print_spool_terminate(fsp->conn, pf);
 236                 }
 237         }
 238         talloc_free(tmp_ctx);
 239         return status;
 240 }
 241
 242 int print_spool_write(files_struct *fsp,
 243                       const char *data, uint32_t size,
 244                       off_t offset, uint32_t *written)
 245 {
 246         SMB_STRUCT_STAT st;
 247         ssize_t n;
 248         int ret;
 249
 250         *written = 0;
 251
 252         /* first of all stat file to find out if it is still there.
 253          * spoolss may have deleted it to signal someone has killed
 254          * the job through it's interface */
 255
 256         if (sys_fstat(fsp->fh->fd, &st, false) != 0) {
 257                 ret = errno;
 258                 DEBUG(3, ("printfile_offset: sys_fstat failed on %s (%s)\n",
 259                           fsp_str_dbg(fsp), strerror(ret)));
 260                 return ret;
 261         }
 262
 263         /* check if the file is unlinked, this will signal spoolss has
 264          * killed it, just return an error and close the file */
 265         if (st.st_ex_nlink == 0) {
 266                 close(fsp->fh->fd);
 267                 return EBADF;
 268         }
 269
 270         /* When print files go beyond 4GB, the 32-bit offset sent in
 271          * old SMBwrite calls is relative to the current 4GB chunk
 272          * we're writing to.
 273          *    Discovered by Sebastian Kloska <oncaphillis@snafu.de>.
 274          */
 275         if (offset < 0xffffffff00000000LL) {
 276                 offset = (st.st_ex_size & 0xffffffff00000000LL) + offset;
 277         }
 278
 279         n = write_data_at_offset(fsp->fh->fd, data, size, offset);
 280         if (n == -1) {
 281                 ret = errno;
 282                 print_spool_terminate(fsp->conn, fsp->print_file);
 283         } else {
 284                 *written = n;
 285                 ret = 0;
 286         }
 287
 288         return ret;
 289 }
 290
 291 void print_spool_end(files_struct *fsp, enum file_close_type close_type)
 292 {
 293         NTSTATUS status;
 294         WERROR werr;
 295         struct dcerpc_binding_handle *b = NULL;
 296
 297         b = fsp->conn->spoolss_pipe->binding_handle;
 298
 299         switch (close_type) {
 300         case NORMAL_CLOSE:
 301         case SHUTDOWN_CLOSE:
 302                 /* this also automatically calls spoolss_EndDocPrinter */
 303                 status = dcerpc_spoolss_ClosePrinter(b, fsp->print_file,
 304                                                 &fsp->print_file->handle,
 305                                                 &werr);
 306                 if (!NT_STATUS_IS_OK(status) ||
 307                     !NT_STATUS_IS_OK(status = werror_to_ntstatus(werr))) {
 308                         DEBUG(3, ("Failed to close printer %s [%s]\n",
 309                               fsp->print_file->svcname, nt_errstr(status)));
 310                 }
 311                 break;
 312         case ERROR_CLOSE:
 313                 print_spool_terminate(fsp->conn, fsp->print_file);
 314                 break;
 315         }
 316 }
 317
 318
 319 void print_spool_terminate(struct connection_struct *conn,
 320                            struct print_file_data *print_file)
 321 {
 322         NTSTATUS status;
 323         WERROR werr;
 324         struct dcerpc_binding_handle *b = NULL;
 325
 326         rap_jobid_delete(print_file->svcname, print_file->jobid);
 327
 328         status = rpc_pipe_open_interface(conn,
 329                                          &ndr_table_spoolss.syntax_id,
 330                                          conn->session_info,
 331                                          conn->sconn->remote_address,
 332                                          conn->sconn->msg_ctx,
 333                                          &conn->spoolss_pipe);
 334         if (!NT_STATUS_IS_OK(status)) {
 335                 DEBUG(0, ("print_spool_terminate: "
 336                           "Failed to get spoolss pipe [%s]\n",
 337                           nt_errstr(status)));
 338                 return;
 339         }
 340         b = conn->spoolss_pipe->binding_handle;
 341
 342         status = dcerpc_spoolss_SetJob(b, print_file,
 343                                         &print_file->handle,
 344                                         print_file->jobid,
 345                                         NULL, SPOOLSS_JOB_CONTROL_DELETE,
 346                                         &werr);
 347         if (!NT_STATUS_IS_OK(status) ||
 348             !NT_STATUS_IS_OK(status = werror_to_ntstatus(werr))) {
 349                 DEBUG(3, ("Failed to delete job %d [%s]\n",
 350                           print_file->jobid, nt_errstr(status)));
 351                 return;
 352         }
 353         status = dcerpc_spoolss_ClosePrinter(b, print_file,
 354                                              &print_file->handle,
 355                                              &werr);
 356         if (!NT_STATUS_IS_OK(status) ||
 357             !NT_STATUS_IS_OK(status = werror_to_ntstatus(werr))) {
 358                 DEBUG(3, ("Failed to close printer %s [%s]\n",
 359                           print_file->svcname, nt_errstr(status)));
 360                 return;
 361         }
 362 }