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