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