src/udev/scsi_id/scsi_id.c

   1 /*
   2  * Copyright (C) IBM Corp. 2003
   3  * Copyright (C) SUSE Linux Products GmbH, 2006
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <stdarg.h>
  22 #include <stdbool.h>
  23 #include <unistd.h>
  24 #include <signal.h>
  25 #include <fcntl.h>
  26 #include <errno.h>
  27 #include <string.h>
  28 #include <syslog.h>
  29 #include <ctype.h>
  30 #include <getopt.h>
  31 #include <sys/stat.h>
  32
  33 #include "libudev.h"
  34 #include "libudev-private.h"
  35 #include "scsi_id.h"
  36 #include "udev-util.h"
  37
  38 static const struct option options[] = {
  39         { "device",             required_argument, NULL, 'd' },
  40         { "config",             required_argument, NULL, 'f' },
  41         { "page",               required_argument, NULL, 'p' },
  42         { "blacklisted",        no_argument,       NULL, 'b' },
  43         { "whitelisted",        no_argument,       NULL, 'g' },
  44         { "replace-whitespace", no_argument,       NULL, 'u' },
  45         { "sg-version",         required_argument, NULL, 's' },
  46         { "verbose",            no_argument,       NULL, 'v' },
  47         { "version",            no_argument,       NULL, 'V' }, /* don't advertise -V */
  48         { "export",             no_argument,       NULL, 'x' },
  49         { "help",               no_argument,       NULL, 'h' },
  50         {}
  51 };
  52
  53 static bool all_good = false;
  54 static bool dev_specified = false;
  55 static char config_file[MAX_PATH_LEN] = "/etc/scsi_id.config";
  56 static enum page_code default_page_code = PAGE_UNSPECIFIED;
  57 static int sg_version = 4;
  58 static int debug = 0;
  59 static bool reformat_serial = false;
  60 static bool export = false;
  61 static char vendor_str[64];
  62 static char model_str[64];
  63 static char vendor_enc_str[256];
  64 static char model_enc_str[256];
  65 static char revision_str[16];
  66 static char type_str[16];
  67
  68 _printf_(6,0)
  69 static void log_fn(struct udev *udev, int priority,
  70                    const char *file, int line, const char *fn,
  71                    const char *format, va_list args)
  72 {
  73         vsyslog(priority, format, args);
  74 }
  75
  76 static void set_type(const char *from, char *to, size_t len)
  77 {
  78         int type_num;
  79         char *eptr;
  80         const char *type = "generic";
  81
  82         type_num = strtoul(from, &eptr, 0);
  83         if (eptr != from) {
  84                 switch (type_num) {
  85                 case 0:
  86                         type = "disk";
  87                         break;
  88                 case 1:
  89                         type = "tape";
  90                         break;
  91                 case 4:
  92                         type = "optical";
  93                         break;
  94                 case 5:
  95                         type = "cd";
  96                         break;
  97                 case 7:
  98                         type = "optical";
  99                         break;
 100                 case 0xe:
 101                         type = "disk";
 102                         break;
 103                 case 0xf:
 104                         type = "optical";
 105                         break;
 106                 default:
 107                         break;
 108                 }
 109         }
 110         strscpy(to, len, type);
 111 }
 112
 113 /*
 114  * get_value:
 115  *
 116  * buf points to an '=' followed by a quoted string ("foo") or a string ending
 117  * with a space or ','.
 118  *
 119  * Return a pointer to the NUL terminated string, returns NULL if no
 120  * matches.
 121  */
 122 static char *get_value(char **buffer)
 123 {
 124         static const char *quote_string = "\"\n";
 125         static const char *comma_string = ",\n";
 126         char *val;
 127         const char *end;
 128
 129         if (**buffer == '"') {
 130                 /*
 131                  * skip leading quote, terminate when quote seen
 132                  */
 133                 (*buffer)++;
 134                 end = quote_string;
 135         } else {
 136                 end = comma_string;
 137         }
 138         val = strsep(buffer, end);
 139         if (val && end == quote_string)
 140                 /*
 141                  * skip trailing quote
 142                  */
 143                 (*buffer)++;
 144
 145         while (isspace(**buffer))
 146                 (*buffer)++;
 147
 148         return val;
 149 }
 150
 151 static int argc_count(char *opts)
 152 {
 153         int i = 0;
 154         while (*opts != '\0')
 155                 if (*opts++ == ' ')
 156                         i++;
 157         return i;
 158 }
 159
 160 /*
 161  * get_file_options:
 162  *
 163  * If vendor == NULL, find a line in the config file with only "OPTIONS=";
 164  * if vendor and model are set find the first OPTIONS line in the config
 165  * file that matches. Set argc and argv to match the OPTIONS string.
 166  *
 167  * vendor and model can end in '\n'.
 168  */
 169 static int get_file_options(struct udev *udev,
 170                             const char *vendor, const char *model,
 171                             int *argc, char ***newargv)
 172 {
 173         char *buffer;
 174         _cleanup_fclose_ FILE *f;
 175         char *buf;
 176         char *str1;
 177         char *vendor_in, *model_in, *options_in; /* read in from file */
 178         int lineno;
 179         int c;
 180         int retval = 0;
 181
 182         f = fopen(config_file, "re");
 183         if (f == NULL) {
 184                 if (errno == ENOENT)
 185                         return 1;
 186                 else {
 187                         log_error("can't open %s: %m\n", config_file);
 188                         return -1;
 189                 }
 190         }
 191
 192         /*
 193          * Allocate a buffer rather than put it on the stack so we can
 194          * keep it around to parse any options (any allocated newargv
 195          * points into this buffer for its strings).
 196          */
 197         buffer = malloc(MAX_BUFFER_LEN);
 198         if (!buffer)
 199                 return log_oom();
 200
 201         *newargv = NULL;
 202         lineno = 0;
 203         while (1) {
 204                 vendor_in = model_in = options_in = NULL;
 205
 206                 buf = fgets(buffer, MAX_BUFFER_LEN, f);
 207                 if (buf == NULL)
 208                         break;
 209                 lineno++;
 210                 if (buf[strlen(buffer) - 1] != '\n') {
 211                         log_error("Config file line %d too long\n", lineno);
 212                         break;
 213                 }
 214
 215                 while (isspace(*buf))
 216                         buf++;
 217
 218                 /* blank or all whitespace line */
 219                 if (*buf == '\0')
 220                         continue;
 221
 222                 /* comment line */
 223                 if (*buf == '#')
 224                         continue;
 225
 226                 str1 = strsep(&buf, "=");
 227                 if (str1 && strcaseeq(str1, "VENDOR")) {
 228                         str1 = get_value(&buf);
 229                         if (!str1) {
 230                                 retval = log_oom();
 231                                 break;
 232                         }
 233                         vendor_in = str1;
 234
 235                         str1 = strsep(&buf, "=");
 236                         if (str1 && strcaseeq(str1, "MODEL")) {
 237                                 str1 = get_value(&buf);
 238                                 if (!str1) {
 239                                         retval = log_oom();
 240                                         break;
 241                                 }
 242                                 model_in = str1;
 243                                 str1 = strsep(&buf, "=");
 244                         }
 245                 }
 246
 247                 if (str1 && strcaseeq(str1, "OPTIONS")) {
 248                         str1 = get_value(&buf);
 249                         if (!str1) {
 250                                 retval = log_oom();
 251                                 break;
 252                         }
 253                         options_in = str1;
 254                 }
 255
 256                 /*
 257                  * Only allow: [vendor=foo[,model=bar]]options=stuff
 258                  */
 259                 if (!options_in || (!vendor_in && model_in)) {
 260                         log_error("Error parsing config file line %d '%s'\n", lineno, buffer);
 261                         retval = -1;
 262                         break;
 263                 }
 264                 if (vendor == NULL) {
 265                         if (vendor_in == NULL)
 266                                 break;
 267                 } else if (vendor_in &&
 268                            strneq(vendor, vendor_in, strlen(vendor_in)) &&
 269                            (!model_in ||
 270                             (strneq(model, model_in, strlen(model_in))))) {
 271                                 /*
 272                                  * Matched vendor and optionally model.
 273                                  *
 274                                  * Note: a short vendor_in or model_in can
 275                                  * give a partial match (that is FOO
 276                                  * matches FOOBAR).
 277                                  */
 278                                 break;
 279                 }
 280         }
 281
 282         if (retval == 0) {
 283                 if (vendor_in != NULL || model_in != NULL ||
 284                     options_in != NULL) {
 285                         /*
 286                          * Something matched. Allocate newargv, and store
 287                          * values found in options_in.
 288                          */
 289                         strcpy(buffer, options_in);
 290                         c = argc_count(buffer) + 2;
 291                         *newargv = calloc(c, sizeof(**newargv));
 292                         if (!*newargv) {
 293                                 retval = log_oom();
 294                         } else {
 295                                 *argc = c;
 296                                 c = 0;
 297                                 /*
 298                                  * argv[0] at 0 is skipped by getopt, but
 299                                  * store the buffer address there for
 300                                  * later freeing
 301                                  */
 302                                 (*newargv)[c] = buffer;
 303                                 for (c = 1; c < *argc; c++)
 304                                         (*newargv)[c] = strsep(&buffer, " \t");
 305                         }
 306                 } else {
 307                         /* No matches  */
 308                         retval = 1;
 309                 }
 310         }
 311         if (retval != 0)
 312                 free(buffer);
 313         return retval;
 314 }
 315
 316 static void help(void) {
 317         printf("Usage: scsi_id [OPTION...] DEVICE\n"
 318                "  -d,--device=                     device node for SG_IO commands\n"
 319                "  -f,--config=                     location of config file\n"
 320                "  -p,--page=0x80|0x83|pre-spc3-83  SCSI page (0x80, 0x83, pre-spc3-83)\n"
 321                "  -s,--sg-version=3|4              use SGv3 or SGv4\n"
 322                "  -b,--blacklisted                 threat device as blacklisted\n"
 323                "  -g,--whitelisted                 threat device as whitelisted\n"
 324                "  -u,--replace-whitespace          replace all whitespace by underscores\n"
 325                "  -v,--verbose                     verbose logging\n"
 326                "     --version                     print version\n"
 327                "  -x,--export                      print values as environment keys\n"
 328                "  -h,--help                        print this help text\n\n");
 329
 330 }
 331
 332 static int set_options(struct udev *udev,
 333                        int argc, char **argv,
 334                        char *maj_min_dev)
 335 {
 336         int option;
 337
 338         /*
 339          * optind is a global extern used by getopt. Since we can call
 340          * set_options twice (once for command line, and once for config
 341          * file) we have to reset this back to 1.
 342          */
 343         optind = 1;
 344         while ((option = getopt_long(argc, argv, "d:f:gp:uvVxh", options, NULL)) >= 0)
 345                 switch (option) {
 346                 case 'b':
 347                         all_good = false;
 348                         break;
 349
 350                 case 'd':
 351                         dev_specified = true;
 352                         strscpy(maj_min_dev, MAX_PATH_LEN, optarg);
 353                         break;
 354
 355                 case 'f':
 356                         strscpy(config_file, MAX_PATH_LEN, optarg);
 357                         break;
 358
 359                 case 'g':
 360                         all_good = true;
 361                         break;
 362
 363                 case 'h':
 364                         help();
 365                         exit(0);
 366
 367                 case 'p':
 368                         if (streq(optarg, "0x80"))
 369                                 default_page_code = PAGE_80;
 370                         else if (streq(optarg, "0x83"))
 371                                 default_page_code = PAGE_83;
 372                         else if (streq(optarg, "pre-spc3-83"))
 373                                 default_page_code = PAGE_83_PRE_SPC3;
 374                         else {
 375                                 log_error("Unknown page code '%s'\n", optarg);
 376                                 return -1;
 377                         }
 378                         break;
 379
 380                 case 's':
 381                         sg_version = atoi(optarg);
 382                         if (sg_version < 3 || sg_version > 4) {
 383                                 log_error("Unknown SG version '%s'\n", optarg);
 384                                 return -1;
 385                         }
 386                         break;
 387
 388                 case 'u':
 389                         reformat_serial = true;
 390                         break;
 391
 392                 case 'v':
 393                         debug++;
 394                         break;
 395
 396                 case 'V':
 397                         printf("%s\n", VERSION);
 398                         exit(0);
 399                         break;
 400
 401                 case 'x':
 402                         export = true;
 403                         break;
 404
 405                 case '?':
 406                         return -1;
 407
 408                 default:
 409                         assert_not_reached("Unknown option");
 410                 }
 411
 412         if (optind < argc && !dev_specified) {
 413                 dev_specified = true;
 414                 strscpy(maj_min_dev, MAX_PATH_LEN, argv[optind]);
 415         }
 416
 417         return 0;
 418 }
 419
 420 static int per_dev_options(struct udev *udev,
 421                            struct scsi_id_device *dev_scsi, int *good_bad, int *page_code)
 422 {
 423         int retval;
 424         int newargc;
 425         char **newargv = NULL;
 426         int option;
 427
 428         *good_bad = all_good;
 429         *page_code = default_page_code;
 430
 431         retval = get_file_options(udev, vendor_str, model_str, &newargc, &newargv);
 432
 433         optind = 1; /* reset this global extern */
 434         while (retval == 0) {
 435                 option = getopt_long(newargc, newargv, "bgp:", options, NULL);
 436                 if (option == -1)
 437                         break;
 438
 439                 switch (option) {
 440                 case 'b':
 441                         *good_bad = 0;
 442                         break;
 443
 444                 case 'g':
 445                         *good_bad = 1;
 446                         break;
 447
 448                 case 'p':
 449                         if (streq(optarg, "0x80")) {
 450                                 *page_code = PAGE_80;
 451                         } else if (streq(optarg, "0x83")) {
 452                                 *page_code = PAGE_83;
 453                         } else if (streq(optarg, "pre-spc3-83")) {
 454                                 *page_code = PAGE_83_PRE_SPC3;
 455                         } else {
 456                                 log_error("Unknown page code '%s'\n", optarg);
 457                                 retval = -1;
 458                         }
 459                         break;
 460
 461                 default:
 462                         log_error("Unknown or bad option '%c' (0x%x)\n", option, option);
 463                         retval = -1;
 464                         break;
 465                 }
 466         }
 467
 468         if (newargv) {
 469                 free(newargv[0]);
 470                 free(newargv);
 471         }
 472         return retval;
 473 }
 474
 475 static int set_inq_values(struct udev *udev, struct scsi_id_device *dev_scsi, const char *path)
 476 {
 477         int retval;
 478
 479         dev_scsi->use_sg = sg_version;
 480
 481         retval = scsi_std_inquiry(udev, dev_scsi, path);
 482         if (retval)
 483                 return retval;
 484
 485         udev_util_encode_string(dev_scsi->vendor, vendor_enc_str, sizeof(vendor_enc_str));
 486         udev_util_encode_string(dev_scsi->model, model_enc_str, sizeof(model_enc_str));
 487
 488         util_replace_whitespace(dev_scsi->vendor, vendor_str, sizeof(vendor_str));
 489         util_replace_chars(vendor_str, NULL);
 490         util_replace_whitespace(dev_scsi->model, model_str, sizeof(model_str));
 491         util_replace_chars(model_str, NULL);
 492         set_type(dev_scsi->type, type_str, sizeof(type_str));
 493         util_replace_whitespace(dev_scsi->revision, revision_str, sizeof(revision_str));
 494         util_replace_chars(revision_str, NULL);
 495         return 0;
 496 }
 497
 498 /*
 499  * scsi_id: try to get an id, if one is found, printf it to stdout.
 500  * returns a value passed to exit() - 0 if printed an id, else 1.
 501  */
 502 static int scsi_id(struct udev *udev, char *maj_min_dev)
 503 {
 504         struct scsi_id_device dev_scsi = {};
 505         int good_dev;
 506         int page_code;
 507         int retval = 0;
 508
 509         if (set_inq_values(udev, &dev_scsi, maj_min_dev) < 0) {
 510                 retval = 1;
 511                 goto out;
 512         }
 513
 514         /* get per device (vendor + model) options from the config file */
 515         per_dev_options(udev, &dev_scsi, &good_dev, &page_code);
 516         if (!good_dev) {
 517                 retval = 1;
 518                 goto out;
 519         }
 520
 521         /* read serial number from mode pages (no values for optical drives) */
 522         scsi_get_serial(udev, &dev_scsi, maj_min_dev, page_code, MAX_SERIAL_LEN);
 523
 524         if (export) {
 525                 char serial_str[MAX_SERIAL_LEN];
 526
 527                 printf("ID_SCSI=1\n");
 528                 printf("ID_VENDOR=%s\n", vendor_str);
 529                 printf("ID_VENDOR_ENC=%s\n", vendor_enc_str);
 530                 printf("ID_MODEL=%s\n", model_str);
 531                 printf("ID_MODEL_ENC=%s\n", model_enc_str);
 532                 printf("ID_REVISION=%s\n", revision_str);
 533                 printf("ID_TYPE=%s\n", type_str);
 534                 if (dev_scsi.serial[0] != '\0') {
 535                         util_replace_whitespace(dev_scsi.serial, serial_str, sizeof(serial_str));
 536                         util_replace_chars(serial_str, NULL);
 537                         printf("ID_SERIAL=%s\n", serial_str);
 538                         util_replace_whitespace(dev_scsi.serial_short, serial_str, sizeof(serial_str));
 539                         util_replace_chars(serial_str, NULL);
 540                         printf("ID_SERIAL_SHORT=%s\n", serial_str);
 541                 }
 542                 if (dev_scsi.wwn[0] != '\0') {
 543                         printf("ID_WWN=0x%s\n", dev_scsi.wwn);
 544                         if (dev_scsi.wwn_vendor_extension[0] != '\0') {
 545                                 printf("ID_WWN_VENDOR_EXTENSION=0x%s\n", dev_scsi.wwn_vendor_extension);
 546                                 printf("ID_WWN_WITH_EXTENSION=0x%s%s\n", dev_scsi.wwn, dev_scsi.wwn_vendor_extension);
 547                         } else {
 548                                 printf("ID_WWN_WITH_EXTENSION=0x%s\n", dev_scsi.wwn);
 549                         }
 550                 }
 551                 if (dev_scsi.tgpt_group[0] != '\0') {
 552                         printf("ID_TARGET_PORT=%s\n", dev_scsi.tgpt_group);
 553                 }
 554                 if (dev_scsi.unit_serial_number[0] != '\0') {
 555                         printf("ID_SCSI_SERIAL=%s\n", dev_scsi.unit_serial_number);
 556                 }
 557                 goto out;
 558         }
 559
 560         if (dev_scsi.serial[0] == '\0') {
 561                 retval = 1;
 562                 goto out;
 563         }
 564
 565         if (reformat_serial) {
 566                 char serial_str[MAX_SERIAL_LEN];
 567
 568                 util_replace_whitespace(dev_scsi.serial, serial_str, sizeof(serial_str));
 569                 util_replace_chars(serial_str, NULL);
 570                 printf("%s\n", serial_str);
 571                 goto out;
 572         }
 573
 574         printf("%s\n", dev_scsi.serial);
 575 out:
 576         return retval;
 577 }
 578
 579 int main(int argc, char **argv)
 580 {
 581         _cleanup_udev_unref_ struct udev *udev;
 582         int retval = 0;
 583         char maj_min_dev[MAX_PATH_LEN];
 584         int newargc;
 585         char **newargv = NULL;
 586
 587         udev = udev_new();
 588         if (udev == NULL)
 589                 goto exit;
 590
 591         log_open();
 592         udev_set_log_fn(udev, log_fn);
 593
 594         /*
 595          * Get config file options.
 596          */
 597         retval = get_file_options(udev, NULL, NULL, &newargc, &newargv);
 598         if (retval < 0) {
 599                 retval = 1;
 600                 goto exit;
 601         }
 602         if (retval == 0) {
 603                 assert(newargv);
 604
 605                 if (set_options(udev, newargc, newargv, maj_min_dev) < 0) {
 606                         retval = 2;
 607                         goto exit;
 608                 }
 609         }
 610
 611         /*
 612          * Get command line options (overriding any config file settings).
 613          */
 614         if (set_options(udev, argc, argv, maj_min_dev) < 0)
 615                 exit(1);
 616
 617         if (!dev_specified) {
 618                 log_error("no device specified\n");
 619                 retval = 1;
 620                 goto exit;
 621         }
 622
 623         retval = scsi_id(udev, maj_min_dev);
 624
 625 exit:
 626         if (newargv) {
 627                 free(newargv[0]);
 628                 free(newargv);
 629         }
 630         log_close();
 631         return retval;
 632 }