qemu-io.c

   1 /*
   2  * Command line utility to exercise the QEMU I/O path.
   3  *
   4  * Copyright (C) 2009 Red Hat, Inc.
   5  * Copyright (c) 2003-2005 Silicon Graphics, Inc.
   6  *
   7  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   8  * See the COPYING file in the top-level directory.
   9  */
  10 #include "qemu/osdep.h"
  11 #include <getopt.h>
  12 #include <libgen.h>
  13
  14 #include "qemu-io.h"
  15 #include "qemu/error-report.h"
  16 #include "qemu/main-loop.h"
  17 #include "qemu/option.h"
  18 #include "qemu/config-file.h"
  19 #include "qemu/readline.h"
  20 #include "qapi/qmp/qstring.h"
  21 #include "qom/object_interfaces.h"
  22 #include "sysemu/block-backend.h"
  23 #include "block/block_int.h"
  24 #include "trace/control.h"
  25
  26 #define CMD_NOFILE_OK   0x01
  27
  28 static char *progname;
  29
  30 static BlockBackend *qemuio_blk;
  31
  32 /* qemu-io commands passed using -c */
  33 static int ncmdline;
  34 static char **cmdline;
  35 static bool imageOpts;
  36
  37 static ReadLineState *readline_state;
  38
  39 static int close_f(BlockBackend *blk, int argc, char **argv)
  40 {
  41     blk_unref(qemuio_blk);
  42     qemuio_blk = NULL;
  43     return 0;
  44 }
  45
  46 static const cmdinfo_t close_cmd = {
  47     .name       = "close",
  48     .altname    = "c",
  49     .cfunc      = close_f,
  50     .oneline    = "close the current open file",
  51 };
  52
  53 static int openfile(char *name, int flags, QDict *opts)
  54 {
  55     Error *local_err = NULL;
  56     BlockDriverState *bs;
  57
  58     if (qemuio_blk) {
  59         error_report("file open already, try 'help close'");
  60         QDECREF(opts);
  61         return 1;
  62     }
  63
  64     qemuio_blk = blk_new_open("hda", name, NULL, opts, flags, &local_err);
  65     if (!qemuio_blk) {
  66         error_reportf_err(local_err, "can't open%s%s: ",
  67                           name ? " device " : "", name ?: "");
  68         return 1;
  69     }
  70
  71     bs = blk_bs(qemuio_blk);
  72     if (bdrv_is_encrypted(bs)) {
  73         char password[256];
  74         printf("Disk image '%s' is encrypted.\n", name);
  75         if (qemu_read_password(password, sizeof(password)) < 0) {
  76             error_report("No password given");
  77             goto error;
  78         }
  79         if (bdrv_set_key(bs, password) < 0) {
  80             error_report("invalid password");
  81             goto error;
  82         }
  83     }
  84
  85
  86     return 0;
  87
  88  error:
  89     blk_unref(qemuio_blk);
  90     qemuio_blk = NULL;
  91     return 1;
  92 }
  93
  94 static void open_help(void)
  95 {
  96     printf(
  97 "\n"
  98 " opens a new file in the requested mode\n"
  99 "\n"
 100 " Example:\n"
 101 " 'open -Cn /tmp/data' - creates/opens data file read-write and uncached\n"
 102 "\n"
 103 " Opens a file for subsequent use by all of the other qemu-io commands.\n"
 104 " -r, -- open file read-only\n"
 105 " -s, -- use snapshot file\n"
 106 " -n, -- disable host cache\n"
 107 " -o, -- options to be given to the block driver"
 108 "\n");
 109 }
 110
 111 static int open_f(BlockBackend *blk, int argc, char **argv);
 112
 113 static const cmdinfo_t open_cmd = {
 114     .name       = "open",
 115     .altname    = "o",
 116     .cfunc      = open_f,
 117     .argmin     = 1,
 118     .argmax     = -1,
 119     .flags      = CMD_NOFILE_OK,
 120     .args       = "[-Crsn] [-o options] [path]",
 121     .oneline    = "open the file specified by path",
 122     .help       = open_help,
 123 };
 124
 125 static QemuOptsList empty_opts = {
 126     .name = "drive",
 127     .merge_lists = true,
 128     .head = QTAILQ_HEAD_INITIALIZER(empty_opts.head),
 129     .desc = {
 130         /* no elements => accept any params */
 131         { /* end of list */ }
 132     },
 133 };
 134
 135 static int open_f(BlockBackend *blk, int argc, char **argv)
 136 {
 137     int flags = 0;
 138     int readonly = 0;
 139     int c;
 140     QemuOpts *qopts;
 141     QDict *opts;
 142
 143     while ((c = getopt(argc, argv, "snrgo:")) != -1) {
 144         switch (c) {
 145         case 's':
 146             flags |= BDRV_O_SNAPSHOT;
 147             break;
 148         case 'n':
 149             flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB;
 150             break;
 151         case 'r':
 152             readonly = 1;
 153             break;
 154         case 'o':
 155             if (imageOpts) {
 156                 printf("--image-opts and 'open -o' are mutually exclusive\n");
 157                 return 0;
 158             }
 159             if (!qemu_opts_parse_noisily(&empty_opts, optarg, false)) {
 160                 qemu_opts_reset(&empty_opts);
 161                 return 0;
 162             }
 163             break;
 164         default:
 165             qemu_opts_reset(&empty_opts);
 166             return qemuio_command_usage(&open_cmd);
 167         }
 168     }
 169
 170     if (!readonly) {
 171         flags |= BDRV_O_RDWR;
 172     }
 173
 174     if (imageOpts && (optind == argc - 1)) {
 175         if (!qemu_opts_parse_noisily(&empty_opts, argv[optind], false)) {
 176             qemu_opts_reset(&empty_opts);
 177             return 0;
 178         }
 179         optind++;
 180     }
 181
 182     qopts = qemu_opts_find(&empty_opts, NULL);
 183     opts = qopts ? qemu_opts_to_qdict(qopts, NULL) : NULL;
 184     qemu_opts_reset(&empty_opts);
 185
 186     if (optind == argc - 1) {
 187         return openfile(argv[optind], flags, opts);
 188     } else if (optind == argc) {
 189         return openfile(NULL, flags, opts);
 190     } else {
 191         QDECREF(opts);
 192         return qemuio_command_usage(&open_cmd);
 193     }
 194 }
 195
 196 static int quit_f(BlockBackend *blk, int argc, char **argv)
 197 {
 198     return 1;
 199 }
 200
 201 static const cmdinfo_t quit_cmd = {
 202     .name       = "quit",
 203     .altname    = "q",
 204     .cfunc      = quit_f,
 205     .argmin     = -1,
 206     .argmax     = -1,
 207     .flags      = CMD_FLAG_GLOBAL,
 208     .oneline    = "exit the program",
 209 };
 210
 211 static void usage(const char *name)
 212 {
 213     printf(
 214 "Usage: %s [-h] [-V] [-rsnm] [-f FMT] [-c STRING] ... [file]\n"
 215 "QEMU Disk exerciser\n"
 216 "\n"
 217 "  --object OBJECTDEF   define an object such as 'secret' for\n"
 218 "                       passwords and/or encryption keys\n"
 219 "  -c, --cmd STRING     execute command with its arguments\n"
 220 "                       from the given string\n"
 221 "  -f, --format FMT     specifies the block driver to use\n"
 222 "  -r, --read-only      export read-only\n"
 223 "  -s, --snapshot       use snapshot file\n"
 224 "  -n, --nocache        disable host cache\n"
 225 "  -m, --misalign       misalign allocations for O_DIRECT\n"
 226 "  -k, --native-aio     use kernel AIO implementation (on Linux only)\n"
 227 "  -t, --cache=MODE     use the given cache mode for the image\n"
 228 "  -T, --trace FILE     enable trace events listed in the given file\n"
 229 "  -h, --help           display this help and exit\n"
 230 "  -V, --version        output version information and exit\n"
 231 "\n"
 232 "See '%s -c help' for information on available commands."
 233 "\n",
 234     name, name);
 235 }
 236
 237 static char *get_prompt(void)
 238 {
 239     static char prompt[FILENAME_MAX + 2 /*"> "*/ + 1 /*"\0"*/ ];
 240
 241     if (!prompt[0]) {
 242         snprintf(prompt, sizeof(prompt), "%s> ", progname);
 243     }
 244
 245     return prompt;
 246 }
 247
 248 static void GCC_FMT_ATTR(2, 3) readline_printf_func(void *opaque,
 249                                                     const char *fmt, ...)
 250 {
 251     va_list ap;
 252     va_start(ap, fmt);
 253     vprintf(fmt, ap);
 254     va_end(ap);
 255 }
 256
 257 static void readline_flush_func(void *opaque)
 258 {
 259     fflush(stdout);
 260 }
 261
 262 static void readline_func(void *opaque, const char *str, void *readline_opaque)
 263 {
 264     char **line = readline_opaque;
 265     *line = g_strdup(str);
 266 }
 267
 268 static void completion_match(const char *cmd, void *opaque)
 269 {
 270     readline_add_completion(readline_state, cmd);
 271 }
 272
 273 static void readline_completion_func(void *opaque, const char *str)
 274 {
 275     readline_set_completion_index(readline_state, strlen(str));
 276     qemuio_complete_command(str, completion_match, NULL);
 277 }
 278
 279 static char *fetchline_readline(void)
 280 {
 281     char *line = NULL;
 282
 283     readline_start(readline_state, get_prompt(), 0, readline_func, &line);
 284     while (!line) {
 285         int ch = getchar();
 286         if (ch == EOF) {
 287             break;
 288         }
 289         readline_handle_byte(readline_state, ch);
 290     }
 291     return line;
 292 }
 293
 294 #define MAXREADLINESZ 1024
 295 static char *fetchline_fgets(void)
 296 {
 297     char *p, *line = g_malloc(MAXREADLINESZ);
 298
 299     if (!fgets(line, MAXREADLINESZ, stdin)) {
 300         g_free(line);
 301         return NULL;
 302     }
 303
 304     p = line + strlen(line);
 305     if (p != line && p[-1] == '\n') {
 306         p[-1] = '\0';
 307     }
 308
 309     return line;
 310 }
 311
 312 static char *fetchline(void)
 313 {
 314     if (readline_state) {
 315         return fetchline_readline();
 316     } else {
 317         return fetchline_fgets();
 318     }
 319 }
 320
 321 static void prep_fetchline(void *opaque)
 322 {
 323     int *fetchable = opaque;
 324
 325     qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL);
 326     *fetchable= 1;
 327 }
 328
 329 static void command_loop(void)
 330 {
 331     int i, done = 0, fetchable = 0, prompted = 0;
 332     char *input;
 333
 334     for (i = 0; !done && i < ncmdline; i++) {
 335         done = qemuio_command(qemuio_blk, cmdline[i]);
 336     }
 337     if (cmdline) {
 338         g_free(cmdline);
 339         return;
 340     }
 341
 342     while (!done) {
 343         if (!prompted) {
 344             printf("%s", get_prompt());
 345             fflush(stdout);
 346             qemu_set_fd_handler(STDIN_FILENO, prep_fetchline, NULL, &fetchable);
 347             prompted = 1;
 348         }
 349
 350         main_loop_wait(false);
 351
 352         if (!fetchable) {
 353             continue;
 354         }
 355
 356         input = fetchline();
 357         if (input == NULL) {
 358             break;
 359         }
 360         done = qemuio_command(qemuio_blk, input);
 361         g_free(input);
 362
 363         prompted = 0;
 364         fetchable = 0;
 365     }
 366     qemu_set_fd_handler(STDIN_FILENO, NULL, NULL, NULL);
 367 }
 368
 369 static void add_user_command(char *optarg)
 370 {
 371     cmdline = g_renew(char *, cmdline, ++ncmdline);
 372     cmdline[ncmdline-1] = optarg;
 373 }
 374
 375 static void reenable_tty_echo(void)
 376 {
 377     qemu_set_tty_echo(STDIN_FILENO, true);
 378 }
 379
 380 enum {
 381     OPTION_OBJECT = 256,
 382     OPTION_IMAGE_OPTS = 257,
 383 };
 384
 385 static QemuOptsList qemu_object_opts = {
 386     .name = "object",
 387     .implied_opt_name = "qom-type",
 388     .head = QTAILQ_HEAD_INITIALIZER(qemu_object_opts.head),
 389     .desc = {
 390         { }
 391     },
 392 };
 393
 394
 395 static QemuOptsList file_opts = {
 396     .name = "file",
 397     .implied_opt_name = "file",
 398     .head = QTAILQ_HEAD_INITIALIZER(file_opts.head),
 399     .desc = {
 400         /* no elements => accept any params */
 401         { /* end of list */ }
 402     },
 403 };
 404
 405 int main(int argc, char **argv)
 406 {
 407     int readonly = 0;
 408     const char *sopt = "hVc:d:f:rsnmgkt:T:";
 409     const struct option lopt[] = {
 410         { "help", no_argument, NULL, 'h' },
 411         { "version", no_argument, NULL, 'V' },
 412         { "offset", required_argument, NULL, 'o' },
 413         { "cmd", required_argument, NULL, 'c' },
 414         { "format", required_argument, NULL, 'f' },
 415         { "read-only", no_argument, NULL, 'r' },
 416         { "snapshot", no_argument, NULL, 's' },
 417         { "nocache", no_argument, NULL, 'n' },
 418         { "misalign", no_argument, NULL, 'm' },
 419         { "native-aio", no_argument, NULL, 'k' },
 420         { "discard", required_argument, NULL, 'd' },
 421         { "cache", required_argument, NULL, 't' },
 422         { "trace", required_argument, NULL, 'T' },
 423         { "object", required_argument, NULL, OPTION_OBJECT },
 424         { "image-opts", no_argument, NULL, OPTION_IMAGE_OPTS },
 425         { NULL, 0, NULL, 0 }
 426     };
 427     int c;
 428     int opt_index = 0;
 429     int flags = BDRV_O_UNMAP;
 430     Error *local_error = NULL;
 431     QDict *opts = NULL;
 432     const char *format = NULL;
 433
 434 #ifdef CONFIG_POSIX
 435     signal(SIGPIPE, SIG_IGN);
 436 #endif
 437
 438     progname = basename(argv[0]);
 439     qemu_init_exec_dir(argv[0]);
 440
 441     module_call_init(MODULE_INIT_QOM);
 442     qemu_add_opts(&qemu_object_opts);
 443     bdrv_init();
 444
 445     while ((c = getopt_long(argc, argv, sopt, lopt, &opt_index)) != -1) {
 446         switch (c) {
 447         case 's':
 448             flags |= BDRV_O_SNAPSHOT;
 449             break;
 450         case 'n':
 451             flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB;
 452             break;
 453         case 'd':
 454             if (bdrv_parse_discard_flags(optarg, &flags) < 0) {
 455                 error_report("Invalid discard option: %s", optarg);
 456                 exit(1);
 457             }
 458             break;
 459         case 'f':
 460             format = optarg;
 461             break;
 462         case 'c':
 463             add_user_command(optarg);
 464             break;
 465         case 'r':
 466             readonly = 1;
 467             break;
 468         case 'm':
 469             qemuio_misalign = true;
 470             break;
 471         case 'k':
 472             flags |= BDRV_O_NATIVE_AIO;
 473             break;
 474         case 't':
 475             if (bdrv_parse_cache_flags(optarg, &flags) < 0) {
 476                 error_report("Invalid cache option: %s", optarg);
 477                 exit(1);
 478             }
 479             break;
 480         case 'T':
 481             if (!trace_init_backends()) {
 482                 exit(1); /* error message will have been printed */
 483             }
 484             break;
 485         case 'V':
 486             printf("%s version %s\n", progname, QEMU_VERSION);
 487             exit(0);
 488         case 'h':
 489             usage(progname);
 490             exit(0);
 491         case OPTION_OBJECT: {
 492             QemuOpts *qopts;
 493             qopts = qemu_opts_parse_noisily(&qemu_object_opts,
 494                                             optarg, true);
 495             if (!qopts) {
 496                 exit(1);
 497             }
 498         }   break;
 499         case OPTION_IMAGE_OPTS:
 500             imageOpts = true;
 501             break;
 502         default:
 503             usage(progname);
 504             exit(1);
 505         }
 506     }
 507
 508     if ((argc - optind) > 1) {
 509         usage(progname);
 510         exit(1);
 511     }
 512
 513     if (format && imageOpts) {
 514         error_report("--image-opts and -f are mutually exclusive");
 515         exit(1);
 516     }
 517
 518     if (qemu_init_main_loop(&local_error)) {
 519         error_report_err(local_error);
 520         exit(1);
 521     }
 522
 523     if (qemu_opts_foreach(&qemu_object_opts,
 524                           user_creatable_add_opts_foreach,
 525                           NULL, &local_error)) {
 526         error_report_err(local_error);
 527         exit(1);
 528     }
 529
 530     /* initialize commands */
 531     qemuio_add_command(&quit_cmd);
 532     qemuio_add_command(&open_cmd);
 533     qemuio_add_command(&close_cmd);
 534
 535     if (isatty(STDIN_FILENO)) {
 536         readline_state = readline_init(readline_printf_func,
 537                                        readline_flush_func,
 538                                        NULL,
 539                                        readline_completion_func);
 540         qemu_set_tty_echo(STDIN_FILENO, false);
 541         atexit(reenable_tty_echo);
 542     }
 543
 544     /* open the device */
 545     if (!readonly) {
 546         flags |= BDRV_O_RDWR;
 547     }
 548
 549     if ((argc - optind) == 1) {
 550         if (imageOpts) {
 551             QemuOpts *qopts = NULL;
 552             qopts = qemu_opts_parse_noisily(&file_opts, argv[optind], false);
 553             if (!qopts) {
 554                 exit(1);
 555             }
 556             opts = qemu_opts_to_qdict(qopts, NULL);
 557             openfile(NULL, flags, opts);
 558         } else {
 559             if (format) {
 560                 opts = qdict_new();
 561                 qdict_put(opts, "driver", qstring_from_str(format));
 562             }
 563             openfile(argv[optind], flags, opts);
 564         }
 565     }
 566     command_loop();
 567
 568     /*
 569      * Make sure all outstanding requests complete before the program exits.
 570      */
 571     bdrv_drain_all();
 572
 573     blk_unref(qemuio_blk);
 574     g_free(readline_state);
 575     return 0;
 576 }