src/ext.c

   1 /* Extension dependent execution.
   2    Copyright (C) 1994, 1995, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   3    2005, 2007 Free Software Foundation, Inc.
   4
   5    Written by: 1995 Jakub Jelinek
   6                1994 Miguel de Icaza
   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 2 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, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  21
  22 #include <config.h>
  23
  24 #include <ctype.h>
  25 #include <errno.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28
  29 #include <unistd.h>
  30
  31 #include "global.h"
  32 #include "tty.h"
  33 #include "user.h"
  34 #include "main.h"
  35 #include "wtools.h"
  36 #include "ext.h"
  37 #include "view.h"
  38 #include "execute.h"
  39
  40 #include "cons.saver.h"
  41 #include "layout.h"
  42
  43 /* If set, we execute the file command to check the file type */
  44 int use_file_to_check_type = 1;
  45
  46 /* This variable points to a copy of the mc.ext file in memory
  47  * With this we avoid loading/parsing the file each time we
  48  * need it
  49  */
  50 static char *data = NULL;
  51
  52 void
  53 flush_extension_file (void)
  54 {
  55     g_free (data);
  56     data = NULL;
  57 }
  58
  59 typedef char *(*quote_func_t) (const char *name, int quote_percent);
  60
  61 static void
  62 exec_extension (const char *filename, const char *data, int *move_dir,
  63                 int start_line)
  64 {
  65     char *file_name;
  66     int cmd_file_fd;
  67     FILE *cmd_file;
  68     char *cmd = NULL;
  69     int expand_prefix_found = 0;
  70     int parameter_found = 0;
  71     char prompt[80];
  72     int run_view = 0;
  73     int def_hex_mode = default_hex_mode, changed_hex_mode = 0;
  74     int def_nroff_flag = default_nroff_flag, changed_nroff_flag = 0;
  75     int written_nonspace = 0;
  76     int is_cd = 0;
  77     char buffer[1024];
  78     char *p = 0;
  79     char *localcopy = NULL;
  80     int do_local_copy;
  81     time_t localmtime = 0;
  82     struct stat mystat;
  83     quote_func_t quote_func = name_quote;
  84
  85     g_return_if_fail (filename != NULL);
  86     g_return_if_fail (data != NULL);
  87
  88     /* Avoid making a local copy if we are doing a cd */
  89     if (!vfs_file_is_local (filename))
  90         do_local_copy = 1;
  91     else
  92         do_local_copy = 0;
  93
  94     /*
  95      * All commands should be run in /bin/sh regardless of user shell.
  96      * To do that, create temporary shell script and run it.
  97      * Sometimes it's not needed (e.g. for %cd and %view commands),
  98      * but it's easier to create it anyway.
  99      */
 100     cmd_file_fd = mc_mkstemps (&file_name, "mcext", SCRIPT_SUFFIX);
 101
 102     if (cmd_file_fd == -1) {
 103         message (1, MSG_ERROR,
 104                  _(" Cannot create temporary command file \n %s "),
 105                  unix_error_string (errno));
 106         return;
 107     }
 108     cmd_file = fdopen (cmd_file_fd, "w");
 109     fputs ("#! /bin/sh\n", cmd_file);
 110
 111     prompt[0] = 0;
 112     for (; *data && *data != '\n'; data++) {
 113         if (parameter_found) {
 114             if (*data == '}') {
 115                 char *parameter;
 116                 parameter_found = 0;
 117                 parameter = input_dialog (_(" Parameter "), prompt, MC_HISTORY_EXT_PARAMETER, "");
 118                 if (!parameter) {
 119                     /* User canceled */
 120                     fclose (cmd_file);
 121                     unlink (file_name);
 122                     if (localcopy) {
 123                         mc_ungetlocalcopy (filename, localcopy, 0);
 124                         g_free (localcopy);
 125                     }
 126                     g_free (file_name);
 127                     return;
 128                 }
 129                 fputs (parameter, cmd_file);
 130                 written_nonspace = 1;
 131                 g_free (parameter);
 132             } else {
 133                 size_t len = strlen (prompt);
 134
 135                 if (len < sizeof (prompt) - 1) {
 136                     prompt[len] = *data;
 137                     prompt[len + 1] = 0;
 138                 }
 139             }
 140         } else if (expand_prefix_found) {
 141             expand_prefix_found = 0;
 142             if (*data == '{')
 143                 parameter_found = 1;
 144             else {
 145                 int i = check_format_view (data);
 146                 char *v;
 147
 148                 if (i) {
 149                     data += i - 1;
 150                     run_view = 1;
 151                 } else if ((i = check_format_cd (data)) > 0) {
 152                     is_cd = 1;
 153                     quote_func = fake_name_quote;
 154                     do_local_copy = 0;
 155                     p = buffer;
 156                     data += i - 1;
 157                 } else if ((i = check_format_var (data, &v)) > 0 && v) {
 158                     fputs (v, cmd_file);
 159                     g_free (v);
 160                     data += i;
 161                 } else {
 162                     char *text;
 163
 164                     if (*data == 'f') {
 165                         if (do_local_copy) {
 166                             localcopy = mc_getlocalcopy (filename);
 167                             if (localcopy == NULL) {
 168                                 fclose (cmd_file);
 169                                 unlink (file_name);
 170                                 g_free (file_name);
 171                                 return;
 172                             }
 173                             mc_stat (localcopy, &mystat);
 174                             localmtime = mystat.st_mtime;
 175                             text = (*quote_func) (localcopy, 0);
 176                         } else {
 177                             text = (*quote_func) (filename, 0);
 178                         }
 179                     } else
 180                         text = expand_format (NULL, *data, !is_cd);
 181                     if (!is_cd)
 182                         fputs (text, cmd_file);
 183                     else {
 184                         strcpy (p, text);
 185                         p = strchr (p, 0);
 186                     }
 187                     g_free (text);
 188                     written_nonspace = 1;
 189                 }
 190             }
 191         } else {
 192             if (*data == '%')
 193                 expand_prefix_found = 1;
 194             else {
 195                 if (*data != ' ' && *data != '\t')
 196                     written_nonspace = 1;
 197                 if (is_cd)
 198                     *(p++) = *data;
 199                 else
 200                     fputc (*data, cmd_file);
 201             }
 202         }
 203     }                           /* for */
 204
 205     /*
 206      * Make the script remove itself when it finishes.
 207      * Don't do it for the viewer - it may need to rerun the script,
 208      * so we clean up after calling view().
 209      */
 210     if (!run_view) {
 211         fprintf (cmd_file, "\n/bin/rm -f %s\n", file_name);
 212     }
 213
 214     fclose (cmd_file);
 215
 216     if ((run_view && !written_nonspace) || is_cd) {
 217         unlink (file_name);
 218         g_free (file_name);
 219         file_name = NULL;
 220     } else {
 221         /* Set executable flag on the command file ... */
 222         chmod (file_name, S_IRWXU);
 223         /* ... but don't rely on it - run /bin/sh explicitly */
 224         cmd = g_strconcat ("/bin/sh ", file_name, (char *) NULL);
 225     }
 226
 227     if (run_view) {
 228         altered_hex_mode = 0;
 229         altered_nroff_flag = 0;
 230         if (def_hex_mode != default_hex_mode)
 231             changed_hex_mode = 1;
 232         if (def_nroff_flag != default_nroff_flag)
 233             changed_nroff_flag = 1;
 234
 235         /* If we've written whitespace only, then just load filename
 236          * into view
 237          */
 238         if (written_nonspace) {
 239             mc_internal_viewer (cmd, filename, move_dir, start_line);
 240             unlink (file_name);
 241         } else {
 242             mc_internal_viewer (NULL, filename, move_dir, start_line);
 243         }
 244         if (changed_hex_mode && !altered_hex_mode)
 245             default_hex_mode = def_hex_mode;
 246         if (changed_nroff_flag && !altered_nroff_flag)
 247             default_nroff_flag = def_nroff_flag;
 248         repaint_screen ();
 249     } else if (is_cd) {
 250         char *q;
 251         *p = 0;
 252         p = buffer;
 253 /*      while (*p == ' ' && *p == '\t')
 254  *          p++;
 255  */
 256         /* Search last non-space character. Start search at the end in order
 257            not to short filenames containing spaces. */
 258         q = p + strlen (p) - 1;
 259         while (q >= p && (*q == ' ' || *q == '\t'))
 260             q--;
 261         q[1] = 0;
 262         do_cd (p, cd_parse_command);
 263     } else {
 264         shell_execute (cmd, EXECUTE_INTERNAL);
 265         if (console_flag) {
 266             handle_console (CONSOLE_SAVE);
 267             if (output_lines && keybar_visible) {
 268                 show_console_contents (output_start_y,
 269                                        LINES - keybar_visible -
 270                                        output_lines - 1,
 271                                        LINES - keybar_visible - 1);
 272
 273             }
 274         }
 275     }
 276
 277     g_free (file_name);
 278     g_free (cmd);
 279
 280     if (localcopy) {
 281         mc_stat (localcopy, &mystat);
 282         mc_ungetlocalcopy (filename, localcopy,
 283                            localmtime != mystat.st_mtime);
 284         g_free (localcopy);
 285     }
 286 }
 287
 288 #ifdef FILE_L
 289 #   define FILE_CMD "file -L "
 290 #else
 291 #   define FILE_CMD "file "
 292 #endif
 293
 294 /*
 295  * Run the "file" command on the local file.
 296  * Return 1 if the data is valid, 0 otherwise, -1 for fatal errors.
 297  */
 298 static int
 299 get_file_type_local (const char *filename, char *buf, int buflen)
 300 {
 301     int read_bytes = 0;
 302
 303     char *tmp = name_quote (filename, 0);
 304     char *command = g_strconcat (FILE_CMD, tmp, " 2>/dev/null", (char *) 0);
 305     FILE *f = popen (command, "r");
 306
 307     g_free (tmp);
 308     g_free (command);
 309     if (f != NULL) {
 310 #ifdef __QNXNTO__
 311         if (setvbuf (f, NULL, _IOFBF, 0) != 0) {
 312             (void)pclose (f);
 313             return -1;
 314         }
 315 #endif
 316         read_bytes = (fgets (buf, buflen, f)
 317                       != NULL);
 318         if (read_bytes == 0)
 319             buf[0] = 0;
 320         pclose (f);
 321     } else {
 322         return -1;
 323     }
 324
 325     return (read_bytes > 0);
 326 }
 327
 328
 329 /*
 330  * Invoke the "file" command on the file and match its output against PTR.
 331  * have_type is a flag that is set if we already have tried to determine
 332  * the type of that file.
 333  * Return 1 for match, 0 for no match, -1 errors.
 334  */
 335 static int
 336 regex_check_type (const char *filename, const char *ptr, int *have_type)
 337 {
 338     int found = 0;
 339
 340     /* Following variables are valid if *have_type is 1 */
 341     static char content_string[2048];
 342     static int content_shift = 0;
 343     static int got_data = 0;
 344
 345     if (!use_file_to_check_type) {
 346         return 0;
 347     }
 348
 349     if (!*have_type) {
 350         char *realname;         /* name used with "file" */
 351         char *localfile;
 352         /* Don't repeate even unsuccessful checks */
 353         *have_type = 1;
 354
 355         localfile = mc_getlocalcopy (filename);
 356         if (!localfile)
 357             return -1;
 358
 359         realname = localfile;
 360         got_data =
 361             get_file_type_local (localfile, content_string,
 362                                  sizeof (content_string));
 363         mc_ungetlocalcopy (filename, localfile, 0);
 364
 365         if (got_data > 0) {
 366             char *pp;
 367
 368             /* Paranoid termination */
 369             content_string[sizeof (content_string) - 1] = 0;
 370
 371             if ((pp = strchr (content_string, '\n')) != 0)
 372                 *pp = 0;
 373
 374             if (!strncmp (content_string, realname, strlen (realname))) {
 375                 /* Skip "realname: " */
 376                 content_shift = strlen (realname);
 377                 if (content_string[content_shift] == ':') {
 378                     /* Solaris' file prints tab(s) after ':' */
 379                     for (content_shift++;
 380                          content_string[content_shift] == ' '
 381                          || content_string[content_shift] == '\t';
 382                          content_shift++);
 383                 }
 384             }
 385         } else {
 386             /* No data */
 387             content_string[0] = 0;
 388         }
 389         g_free (realname);
 390     }
 391
 392     if (got_data == -1) {
 393         return -1;
 394     }
 395
 396     if (content_string[0]
 397         && regexp_match (ptr, content_string + content_shift, match_regex)) {
 398         found = 1;
 399     }
 400
 401     return found;
 402 }
 403
 404
 405 /* The second argument is action, i.e. Open, View or Edit
 406  *
 407  * This function returns:
 408  *
 409  * -1 for a failure or user interrupt
 410  * 0 if no command was run
 411  * 1 if some command was run
 412  *
 413  * If action == "View" then a parameter is checked in the form of "View:%d",
 414  * if the value for %d exists, then the viewer is started up at that line number.
 415  */
 416 int
 417 regex_command (const char *filename, const char *action, int *move_dir)
 418 {
 419     char *p, *q, *r, c;
 420     int file_len = strlen (filename);
 421     int found = 0;
 422     int error_flag = 0;
 423     int ret = 0;
 424     struct stat mystat;
 425     int view_at_line_number;
 426     char *include_target;
 427     int include_target_len;
 428     int have_type = 0;          /* Flag used by regex_check_type() */
 429
 430     /* Check for the special View:%d parameter */
 431     if (strncmp (action, "View:", 5) == 0) {
 432         view_at_line_number = atoi (action + 5);
 433         action = "View";
 434     } else {
 435         view_at_line_number = 0;
 436     }
 437
 438     if (data == NULL) {
 439         char *extension_file;
 440         int mc_user_ext = 1;
 441         int home_error = 0;
 442
 443         extension_file = concat_dir_and_file (home_dir, MC_USER_EXT);
 444         if (!exist_file (extension_file)) {
 445             g_free (extension_file);
 446           check_stock_mc_ext:
 447             extension_file = concat_dir_and_file (mc_home, MC_LIB_EXT);
 448             mc_user_ext = 0;
 449         }
 450         data = load_file (extension_file);
 451         g_free (extension_file);
 452         if (data == NULL)
 453             return 0;
 454
 455         if (!strstr (data, "default/")) {
 456             if (!strstr (data, "regex/") && !strstr (data, "shell/")
 457                 && !strstr (data, "type/")) {
 458                 g_free (data);
 459                 data = NULL;
 460                 if (mc_user_ext) {
 461                     home_error = 1;
 462                     goto check_stock_mc_ext;
 463                 } else {
 464                     char *title =
 465                         g_strdup_printf (_(" %s%s file error"),
 466                             mc_home, MC_LIB_EXT);
 467                     message (1, title, _("The format of the %smc.ext "
 468                         "file has changed with version 3.0.  It seems that "
 469                         "the installation failed.  Please fetch a fresh "
 470                         "copy from the Midnight Commander package."),
 471                         mc_home);
 472                     g_free (title);
 473                     return 0;
 474                 }
 475             }
 476         }
 477         if (home_error) {
 478             char *title =
 479                 g_strdup_printf (_(" ~/%s file error "), MC_USER_EXT);
 480             message (1, title, _("The format of the ~/%s file has "
 481                 "changed with version 3.0.  You may either want to copy "
 482                 "it from %smc.ext or use that file as an example of how "
 483                 "to write it."), MC_USER_EXT, mc_home);
 484             g_free (title);
 485         }
 486     }
 487     mc_stat (filename, &mystat);
 488
 489     include_target = NULL;
 490     include_target_len = 0;
 491     for (p = data; *p; p++) {
 492         for (q = p; *q == ' ' || *q == '\t'; q++);
 493         if (*q == '\n' || !*q)
 494             p = q;              /* empty line */
 495         if (*p == '#')          /* comment */
 496             while (*p && *p != '\n')
 497                 p++;
 498         if (*p == '\n')
 499             continue;
 500         if (!*p)
 501             break;
 502         if (p == q) {           /* i.e. starts in the first column, should be
 503                                  * keyword/descNL
 504                                  */
 505             found = 0;
 506             q = strchr (p, '\n');
 507             if (q == NULL)
 508                 q = strchr (p, 0);
 509             c = *q;
 510             *q = 0;
 511             if (include_target) {
 512                 if ((strncmp (p, "include/", 8) == 0)
 513                     && (strncmp (p + 8, include_target, include_target_len)
 514                         == 0))
 515                     found = 1;
 516             } else if (!strncmp (p, "regex/", 6)) {
 517                 p += 6;
 518                 /* Do not transform shell patterns, you can use shell/ for
 519                  * that
 520                  */
 521                 if (regexp_match (p, filename, match_regex))
 522                     found = 1;
 523             } else if (!strncmp (p, "directory/", 10)) {
 524                 if (S_ISDIR (mystat.st_mode)
 525                     && regexp_match (p + 10, filename, match_regex))
 526                     found = 1;
 527             } else if (!strncmp (p, "shell/", 6)) {
 528                 p += 6;
 529                 if (*p == '.' && file_len >= (q - p)) {
 530                     if (!strncmp (p, filename + file_len - (q - p), q - p))
 531                         found = 1;
 532                 } else {
 533                     if (q - p == file_len && !strncmp (p, filename, q - p))
 534                         found = 1;
 535                 }
 536             } else if (!strncmp (p, "type/", 5)) {
 537                 int res;
 538                 p += 5;
 539                 res = regex_check_type (filename, p, &have_type);
 540                 if (res == 1)
 541                     found = 1;
 542                 if (res == -1)
 543                     error_flag = 1;     /* leave it if file cannot be opened */
 544             } else if (!strncmp (p, "default/", 8)) {
 545                 found = 1;
 546             }
 547             *q = c;
 548             p = q;
 549             if (!*p)
 550                 break;
 551         } else {                /* List of actions */
 552             p = q;
 553             q = strchr (p, '\n');
 554             if (q == NULL)
 555                 q = strchr (p, 0);
 556             if (found && !error_flag) {
 557                 r = strchr (p, '=');
 558                 if (r != NULL) {
 559                     c = *r;
 560                     *r = 0;
 561                     if (strcmp (p, "Include") == 0) {
 562                         char *t;
 563
 564                         include_target = p + 8;
 565                         t = strchr (include_target, '\n');
 566                         if (t)
 567                             *t = 0;
 568                         include_target_len = strlen (include_target);
 569                         if (t)
 570                             *t = '\n';
 571
 572                         *r = c;
 573                         p = q;
 574                         found = 0;
 575
 576                         if (!*p)
 577                             break;
 578                         continue;
 579                     }
 580                     if (!strcmp (action, p)) {
 581                         *r = c;
 582                         for (p = r + 1; *p == ' ' || *p == '\t'; p++);
 583
 584                         /* Empty commands just stop searching
 585                          * through, they don't do anything
 586                          *
 587                          * We need to copy the filename because exec_extension
 588                          * may end up invoking update_panels thus making the
 589                          * filename parameter invalid (ie, most of the time,
 590                          * we get filename as a pointer from current_panel->dir).
 591                          */
 592                         if (p < q) {
 593                             char *filename_copy = g_strdup (filename);
 594
 595                             exec_extension (filename_copy, r + 1, move_dir,
 596                                             view_at_line_number);
 597                             g_free (filename_copy);
 598
 599                             ret = 1;
 600                         }
 601                         break;
 602                     } else
 603                         *r = c;
 604                 }
 605             }
 606             p = q;
 607             if (!*p)
 608                 break;
 609         }
 610     }
 611     if (error_flag)
 612         return -1;
 613     return ret;
 614 }