apps/opt.c

   1 /*
   2  * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9 #include "apps.h"
  10 #include <string.h>
  11 #if !defined(OPENSSL_SYS_MSDOS)
  12 # include OPENSSL_UNISTD
  13 #endif
  14
  15 #include <stdlib.h>
  16 #include <errno.h>
  17 #include <ctype.h>
  18 #include <limits.h>
  19 #include <openssl/bio.h>
  20 #include <openssl/x509v3.h>
  21
  22 #define MAX_OPT_HELP_WIDTH 30
  23 const char OPT_HELP_STR[] = "--";
  24 const char OPT_MORE_STR[] = "---";
  25
  26 /* Our state */
  27 static char **argv;
  28 static int argc;
  29 static int opt_index;
  30 static char *arg;
  31 static char *flag;
  32 static char *dunno;
  33 static const OPTIONS *unknown;
  34 static const OPTIONS *opts;
  35 static char prog[40];
  36
  37 /*
  38  * Return the simple name of the program; removing various platform gunk.
  39  */
  40 #if defined(OPENSSL_SYS_WIN32)
  41 char *opt_progname(const char *argv0)
  42 {
  43     size_t i, n;
  44     const char *p;
  45     char *q;
  46
  47     /* find the last '/', '\' or ':' */
  48     for (p = argv0 + strlen(argv0); --p > argv0;)
  49         if (*p == '/' || *p == '\\' || *p == ':') {
  50             p++;
  51             break;
  52         }
  53
  54     /* Strip off trailing nonsense. */
  55     n = strlen(p);
  56     if (n > 4 &&
  57         (strcmp(&p[n - 4], ".exe") == 0 || strcmp(&p[n - 4], ".EXE") == 0))
  58         n -= 4;
  59
  60     /* Copy over the name, in lowercase. */
  61     if (n > sizeof(prog) - 1)
  62         n = sizeof(prog) - 1;
  63     for (q = prog, i = 0; i < n; i++, p++)
  64         *q++ = tolower((unsigned char)*p);
  65     *q = '\0';
  66     return prog;
  67 }
  68
  69 #elif defined(OPENSSL_SYS_VMS)
  70
  71 char *opt_progname(const char *argv0)
  72 {
  73     const char *p, *q;
  74
  75     /* Find last special character sys:[foo.bar]openssl */
  76     for (p = argv0 + strlen(argv0); --p > argv0;)
  77         if (*p == ':' || *p == ']' || *p == '>') {
  78             p++;
  79             break;
  80         }
  81
  82     q = strrchr(p, '.');
  83     strncpy(prog, p, sizeof(prog) - 1);
  84     prog[sizeof(prog) - 1] = '\0';
  85     if (q != NULL && q - p < sizeof(prog))
  86         prog[q - p] = '\0';
  87     return prog;
  88 }
  89
  90 #else
  91
  92 char *opt_progname(const char *argv0)
  93 {
  94     const char *p;
  95
  96     /* Could use strchr, but this is like the ones above. */
  97     for (p = argv0 + strlen(argv0); --p > argv0;)
  98         if (*p == '/') {
  99             p++;
 100             break;
 101         }
 102     strncpy(prog, p, sizeof(prog) - 1);
 103     prog[sizeof(prog) - 1] = '\0';
 104     return prog;
 105 }
 106 #endif
 107
 108 char *opt_getprog(void)
 109 {
 110     return prog;
 111 }
 112
 113 /* Set up the arg parsing. */
 114 char *opt_init(int ac, char **av, const OPTIONS *o)
 115 {
 116     /* Store state. */
 117     argc = ac;
 118     argv = av;
 119     opt_index = 1;
 120     opts = o;
 121     opt_progname(av[0]);
 122     unknown = NULL;
 123
 124     for (; o->name; ++o) {
 125 #ifndef NDEBUG
 126         const OPTIONS *next;
 127         int duplicated, i;
 128 #endif
 129
 130         if (o->name == OPT_HELP_STR || o->name == OPT_MORE_STR)
 131             continue;
 132 #ifndef NDEBUG
 133         i = o->valtype;
 134
 135         /* Make sure options are legit. */
 136         assert(o->name[0] != '-');
 137         assert(o->retval > 0);
 138         switch (i) {
 139         case   0: case '-': case '/': case '<': case '>': case 'E': case 'F':
 140         case 'M': case 'U': case 'f': case 'l': case 'n': case 'p': case 's':
 141         case 'u': case 'c':
 142             break;
 143         default:
 144             assert(0);
 145         }
 146
 147         /* Make sure there are no duplicates. */
 148         for (next = o + 1; next->name; ++next) {
 149             /*
 150              * Some compilers inline strcmp and the assert string is too long.
 151              */
 152             duplicated = strcmp(o->name, next->name) == 0;
 153             assert(!duplicated);
 154         }
 155 #endif
 156         if (o->name[0] == '\0') {
 157             assert(unknown == NULL);
 158             unknown = o;
 159             assert(unknown->valtype == 0 || unknown->valtype == '-');
 160         }
 161     }
 162     return prog;
 163 }
 164
 165 static OPT_PAIR formats[] = {
 166     {"PEM/DER", OPT_FMT_PEMDER},
 167     {"pkcs12", OPT_FMT_PKCS12},
 168     {"smime", OPT_FMT_SMIME},
 169     {"engine", OPT_FMT_ENGINE},
 170     {"msblob", OPT_FMT_MSBLOB},
 171     {"nss", OPT_FMT_NSS},
 172     {"text", OPT_FMT_TEXT},
 173     {"http", OPT_FMT_HTTP},
 174     {"pvk", OPT_FMT_PVK},
 175     {NULL}
 176 };
 177
 178 /* Print an error message about a failed format parse. */
 179 int opt_format_error(const char *s, unsigned long flags)
 180 {
 181     OPT_PAIR *ap;
 182
 183     if (flags == OPT_FMT_PEMDER) {
 184         BIO_printf(bio_err, "%s: Bad format \"%s\"; must be pem or der\n",
 185                    prog, s);
 186     } else {
 187         BIO_printf(bio_err, "%s: Bad format \"%s\"; must be one of:\n",
 188                    prog, s);
 189         for (ap = formats; ap->name; ap++)
 190             if (flags & ap->retval)
 191                 BIO_printf(bio_err, "   %s\n", ap->name);
 192     }
 193     return 0;
 194 }
 195
 196 /* Parse a format string, put it into *result; return 0 on failure, else 1. */
 197 int opt_format(const char *s, unsigned long flags, int *result)
 198 {
 199     switch (*s) {
 200     default:
 201         return 0;
 202     case 'D':
 203     case 'd':
 204         if ((flags & OPT_FMT_PEMDER) == 0)
 205             return opt_format_error(s, flags);
 206         *result = FORMAT_ASN1;
 207         break;
 208     case 'T':
 209     case 't':
 210         if ((flags & OPT_FMT_TEXT) == 0)
 211             return opt_format_error(s, flags);
 212         *result = FORMAT_TEXT;
 213         break;
 214     case 'N':
 215     case 'n':
 216         if ((flags & OPT_FMT_NSS) == 0)
 217             return opt_format_error(s, flags);
 218         if (strcmp(s, "NSS") != 0 && strcmp(s, "nss") != 0)
 219             return opt_format_error(s, flags);
 220         *result = FORMAT_NSS;
 221         break;
 222     case 'S':
 223     case 's':
 224         if ((flags & OPT_FMT_SMIME) == 0)
 225             return opt_format_error(s, flags);
 226         *result = FORMAT_SMIME;
 227         break;
 228     case 'M':
 229     case 'm':
 230         if ((flags & OPT_FMT_MSBLOB) == 0)
 231             return opt_format_error(s, flags);
 232         *result = FORMAT_MSBLOB;
 233         break;
 234     case 'E':
 235     case 'e':
 236         if ((flags & OPT_FMT_ENGINE) == 0)
 237             return opt_format_error(s, flags);
 238         *result = FORMAT_ENGINE;
 239         break;
 240     case 'H':
 241     case 'h':
 242         if ((flags & OPT_FMT_HTTP) == 0)
 243             return opt_format_error(s, flags);
 244         *result = FORMAT_HTTP;
 245         break;
 246     case '1':
 247         if ((flags & OPT_FMT_PKCS12) == 0)
 248             return opt_format_error(s, flags);
 249         *result = FORMAT_PKCS12;
 250         break;
 251     case 'P':
 252     case 'p':
 253         if (s[1] == '\0' || strcmp(s, "PEM") == 0 || strcmp(s, "pem") == 0) {
 254             if ((flags & OPT_FMT_PEMDER) == 0)
 255                 return opt_format_error(s, flags);
 256             *result = FORMAT_PEM;
 257         } else if (strcmp(s, "PVK") == 0 || strcmp(s, "pvk") == 0) {
 258             if ((flags & OPT_FMT_PVK) == 0)
 259                 return opt_format_error(s, flags);
 260             *result = FORMAT_PVK;
 261         } else if (strcmp(s, "P12") == 0 || strcmp(s, "p12") == 0
 262                    || strcmp(s, "PKCS12") == 0 || strcmp(s, "pkcs12") == 0) {
 263             if ((flags & OPT_FMT_PKCS12) == 0)
 264                 return opt_format_error(s, flags);
 265             *result = FORMAT_PKCS12;
 266         } else {
 267             return 0;
 268         }
 269         break;
 270     }
 271     return 1;
 272 }
 273
 274 /* Parse a cipher name, put it in *EVP_CIPHER; return 0 on failure, else 1. */
 275 int opt_cipher(const char *name, const EVP_CIPHER **cipherp)
 276 {
 277     *cipherp = EVP_get_cipherbyname(name);
 278     if (*cipherp != NULL)
 279         return 1;
 280     BIO_printf(bio_err, "%s: Unrecognized flag %s\n", prog, name);
 281     return 0;
 282 }
 283
 284 /*
 285  * Parse message digest name, put it in *EVP_MD; return 0 on failure, else 1.
 286  */
 287 int opt_md(const char *name, const EVP_MD **mdp)
 288 {
 289     *mdp = EVP_get_digestbyname(name);
 290     if (*mdp != NULL)
 291         return 1;
 292     BIO_printf(bio_err, "%s: Unrecognized flag %s\n", prog, name);
 293     return 0;
 294 }
 295
 296 /* Look through a list of name/value pairs. */
 297 int opt_pair(const char *name, const OPT_PAIR* pairs, int *result)
 298 {
 299     const OPT_PAIR *pp;
 300
 301     for (pp = pairs; pp->name; pp++)
 302         if (strcmp(pp->name, name) == 0) {
 303             *result = pp->retval;
 304             return 1;
 305         }
 306     BIO_printf(bio_err, "%s: Value must be one of:\n", prog);
 307     for (pp = pairs; pp->name; pp++)
 308         BIO_printf(bio_err, "\t%s\n", pp->name);
 309     return 0;
 310 }
 311
 312 /* Parse an int, put it into *result; return 0 on failure, else 1. */
 313 int opt_int(const char *value, int *result)
 314 {
 315     long l;
 316
 317     if (!opt_long(value, &l))
 318         return 0;
 319     *result = (int)l;
 320     if (*result != l) {
 321         BIO_printf(bio_err, "%s: Value \"%s\" outside integer range\n",
 322                    prog, value);
 323         return 0;
 324     }
 325     return 1;
 326 }
 327
 328 static void opt_number_error(const char *v)
 329 {
 330     size_t i = 0;
 331     struct strstr_pair_st {
 332         char *prefix;
 333         char *name;
 334     } b[] = {
 335         {"0x", "a hexadecimal"},
 336         {"0X", "a hexadecimal"},
 337         {"0", "an octal"}
 338     };
 339
 340     for (i = 0; i < OSSL_NELEM(b); i++) {
 341         if (strncmp(v, b[i].prefix, strlen(b[i].prefix)) == 0) {
 342             BIO_printf(bio_err,
 343                        "%s: Can't parse \"%s\" as %s number\n",
 344                        prog, v, b[i].name);
 345             return;
 346         }
 347     }
 348     BIO_printf(bio_err, "%s: Can't parse \"%s\" as a number\n", prog, v);
 349     return;
 350 }
 351
 352 /* Parse a long, put it into *result; return 0 on failure, else 1. */
 353 int opt_long(const char *value, long *result)
 354 {
 355     int oerrno = errno;
 356     long l;
 357     char *endp;
 358
 359     errno = 0;
 360     l = strtol(value, &endp, 0);
 361     if (*endp
 362             || endp == value
 363             || ((l == LONG_MAX || l == LONG_MIN) && errno == ERANGE)
 364             || (l == 0 && errno != 0)) {
 365         opt_number_error(value);
 366         errno = oerrno;
 367         return 0;
 368     }
 369     *result = l;
 370     errno = oerrno;
 371     return 1;
 372 }
 373
 374 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L && \
 375     defined(INTMAX_MAX) && defined(UINTMAX_MAX)
 376
 377 /* Parse an intmax_t, put it into *result; return 0 on failure, else 1. */
 378 int opt_imax(const char *value, intmax_t *result)
 379 {
 380     int oerrno = errno;
 381     intmax_t m;
 382     char *endp;
 383
 384     errno = 0;
 385     m = strtoimax(value, &endp, 0);
 386     if (*endp
 387             || endp == value
 388             || ((m == INTMAX_MAX || m == INTMAX_MIN) && errno == ERANGE)
 389             || (m == 0 && errno != 0)) {
 390         opt_number_error(value);
 391         errno = oerrno;
 392         return 0;
 393     }
 394     *result = m;
 395     errno = oerrno;
 396     return 1;
 397 }
 398
 399 /* Parse a uintmax_t, put it into *result; return 0 on failure, else 1. */
 400 int opt_umax(const char *value, uintmax_t *result)
 401 {
 402     int oerrno = errno;
 403     uintmax_t m;
 404     char *endp;
 405
 406     errno = 0;
 407     m = strtoumax(value, &endp, 0);
 408     if (*endp
 409             || endp == value
 410             || (m == UINTMAX_MAX && errno == ERANGE)
 411             || (m == 0 && errno != 0)) {
 412         opt_number_error(value);
 413         errno = oerrno;
 414         return 0;
 415     }
 416     *result = m;
 417     errno = oerrno;
 418     return 1;
 419 }
 420 #endif
 421
 422 /*
 423  * Parse an unsigned long, put it into *result; return 0 on failure, else 1.
 424  */
 425 int opt_ulong(const char *value, unsigned long *result)
 426 {
 427     int oerrno = errno;
 428     char *endptr;
 429     unsigned long l;
 430
 431     errno = 0;
 432     l = strtoul(value, &endptr, 0);
 433     if (*endptr
 434             || endptr == value
 435             || ((l == ULONG_MAX) && errno == ERANGE)
 436             || (l == 0 && errno != 0)) {
 437         opt_number_error(value);
 438         errno = oerrno;
 439         return 0;
 440     }
 441     *result = l;
 442     errno = oerrno;
 443     return 1;
 444 }
 445
 446 /*
 447  * We pass opt as an int but cast it to "enum range" so that all the
 448  * items in the OPT_V_ENUM enumeration are caught; this makes -Wswitch
 449  * in gcc do the right thing.
 450  */
 451 enum range { OPT_V_ENUM };
 452
 453 int opt_verify(int opt, X509_VERIFY_PARAM *vpm)
 454 {
 455     int i;
 456     ossl_intmax_t t = 0;
 457     ASN1_OBJECT *otmp;
 458     X509_PURPOSE *xptmp;
 459     const X509_VERIFY_PARAM *vtmp;
 460
 461     assert(vpm != NULL);
 462     assert(opt > OPT_V__FIRST);
 463     assert(opt < OPT_V__LAST);
 464
 465     switch ((enum range)opt) {
 466     case OPT_V__FIRST:
 467     case OPT_V__LAST:
 468         return 0;
 469     case OPT_V_POLICY:
 470         otmp = OBJ_txt2obj(opt_arg(), 0);
 471         if (otmp == NULL) {
 472             BIO_printf(bio_err, "%s: Invalid Policy %s\n", prog, opt_arg());
 473             return 0;
 474         }
 475         X509_VERIFY_PARAM_add0_policy(vpm, otmp);
 476         break;
 477     case OPT_V_PURPOSE:
 478         /* purpose name -> purpose index */
 479         i = X509_PURPOSE_get_by_sname(opt_arg());
 480         if (i < 0) {
 481             BIO_printf(bio_err, "%s: Invalid purpose %s\n", prog, opt_arg());
 482             return 0;
 483         }
 484
 485         /* purpose index -> purpose object */
 486         xptmp = X509_PURPOSE_get0(i);
 487
 488         /* purpose object -> purpose value */
 489         i = X509_PURPOSE_get_id(xptmp);
 490
 491         if (!X509_VERIFY_PARAM_set_purpose(vpm, i)) {
 492             BIO_printf(bio_err,
 493                        "%s: Internal error setting purpose %s\n",
 494                        prog, opt_arg());
 495             return 0;
 496         }
 497         break;
 498     case OPT_V_VERIFY_NAME:
 499         vtmp = X509_VERIFY_PARAM_lookup(opt_arg());
 500         if (vtmp == NULL) {
 501             BIO_printf(bio_err, "%s: Invalid verify name %s\n",
 502                        prog, opt_arg());
 503             return 0;
 504         }
 505         X509_VERIFY_PARAM_set1(vpm, vtmp);
 506         break;
 507     case OPT_V_VERIFY_DEPTH:
 508         i = atoi(opt_arg());
 509         if (i >= 0)
 510             X509_VERIFY_PARAM_set_depth(vpm, i);
 511         break;
 512     case OPT_V_VERIFY_AUTH_LEVEL:
 513         i = atoi(opt_arg());
 514         if (i >= 0)
 515             X509_VERIFY_PARAM_set_auth_level(vpm, i);
 516         break;
 517     case OPT_V_ATTIME:
 518         if (!opt_imax(opt_arg(), &t))
 519             return 0;
 520         if (t != (time_t)t) {
 521             BIO_printf(bio_err, "%s: epoch time out of range %s\n",
 522                        prog, opt_arg());
 523             return 0;
 524         }
 525         X509_VERIFY_PARAM_set_time(vpm, (time_t)t);
 526         break;
 527     case OPT_V_VERIFY_HOSTNAME:
 528         if (!X509_VERIFY_PARAM_set1_host(vpm, opt_arg(), 0))
 529             return 0;
 530         break;
 531     case OPT_V_VERIFY_EMAIL:
 532         if (!X509_VERIFY_PARAM_set1_email(vpm, opt_arg(), 0))
 533             return 0;
 534         break;
 535     case OPT_V_VERIFY_IP:
 536         if (!X509_VERIFY_PARAM_set1_ip_asc(vpm, opt_arg()))
 537             return 0;
 538         break;
 539     case OPT_V_IGNORE_CRITICAL:
 540         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_IGNORE_CRITICAL);
 541         break;
 542     case OPT_V_ISSUER_CHECKS:
 543         /* NOP, deprecated */
 544         break;
 545     case OPT_V_CRL_CHECK:
 546         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_CRL_CHECK);
 547         break;
 548     case OPT_V_CRL_CHECK_ALL:
 549         X509_VERIFY_PARAM_set_flags(vpm,
 550                                     X509_V_FLAG_CRL_CHECK |
 551                                     X509_V_FLAG_CRL_CHECK_ALL);
 552         break;
 553     case OPT_V_POLICY_CHECK:
 554         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_POLICY_CHECK);
 555         break;
 556     case OPT_V_EXPLICIT_POLICY:
 557         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_EXPLICIT_POLICY);
 558         break;
 559     case OPT_V_INHIBIT_ANY:
 560         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_INHIBIT_ANY);
 561         break;
 562     case OPT_V_INHIBIT_MAP:
 563         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_INHIBIT_MAP);
 564         break;
 565     case OPT_V_X509_STRICT:
 566         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_X509_STRICT);
 567         break;
 568     case OPT_V_EXTENDED_CRL:
 569         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_EXTENDED_CRL_SUPPORT);
 570         break;
 571     case OPT_V_USE_DELTAS:
 572         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_USE_DELTAS);
 573         break;
 574     case OPT_V_POLICY_PRINT:
 575         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_NOTIFY_POLICY);
 576         break;
 577     case OPT_V_CHECK_SS_SIG:
 578         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_CHECK_SS_SIGNATURE);
 579         break;
 580     case OPT_V_TRUSTED_FIRST:
 581         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_TRUSTED_FIRST);
 582         break;
 583     case OPT_V_SUITEB_128_ONLY:
 584         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_SUITEB_128_LOS_ONLY);
 585         break;
 586     case OPT_V_SUITEB_128:
 587         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_SUITEB_128_LOS);
 588         break;
 589     case OPT_V_SUITEB_192:
 590         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_SUITEB_192_LOS);
 591         break;
 592     case OPT_V_PARTIAL_CHAIN:
 593         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_PARTIAL_CHAIN);
 594         break;
 595     case OPT_V_NO_ALT_CHAINS:
 596         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_NO_ALT_CHAINS);
 597         break;
 598     case OPT_V_NO_CHECK_TIME:
 599         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_NO_CHECK_TIME);
 600         break;
 601     case OPT_V_ALLOW_PROXY_CERTS:
 602         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_ALLOW_PROXY_CERTS);
 603         break;
 604     }
 605     return 1;
 606
 607 }
 608
 609 /*
 610  * Parse the next flag (and value if specified), return 0 if done, -1 on
 611  * error, otherwise the flag's retval.
 612  */
 613 int opt_next(void)
 614 {
 615     char *p;
 616     const OPTIONS *o;
 617     int ival;
 618     long lval;
 619     unsigned long ulval;
 620     ossl_intmax_t imval;
 621     ossl_uintmax_t umval;
 622
 623     /* Look at current arg; at end of the list? */
 624     arg = NULL;
 625     p = argv[opt_index];
 626     if (p == NULL)
 627         return 0;
 628
 629     /* If word doesn't start with a -, we're done. */
 630     if (*p != '-')
 631         return 0;
 632
 633     /* Hit "--" ? We're done. */
 634     opt_index++;
 635     if (strcmp(p, "--") == 0)
 636         return 0;
 637
 638     /* Allow -nnn and --nnn */
 639     if (*++p == '-')
 640         p++;
 641     flag = p - 1;
 642
 643     /* If we have --flag=foo, snip it off */
 644     if ((arg = strchr(p, '=')) != NULL)
 645         *arg++ = '\0';
 646     for (o = opts; o->name; ++o) {
 647         /* If not this option, move on to the next one. */
 648         if (strcmp(p, o->name) != 0)
 649             continue;
 650
 651         /* If it doesn't take a value, make sure none was given. */
 652         if (o->valtype == 0 || o->valtype == '-') {
 653             if (arg) {
 654                 BIO_printf(bio_err,
 655                            "%s: Option -%s does not take a value\n", prog, p);
 656                 return -1;
 657             }
 658             return o->retval;
 659         }
 660
 661         /* Want a value; get the next param if =foo not used. */
 662         if (arg == NULL) {
 663             if (argv[opt_index] == NULL) {
 664                 BIO_printf(bio_err,
 665                            "%s: Option -%s needs a value\n", prog, o->name);
 666                 return -1;
 667             }
 668             arg = argv[opt_index++];
 669         }
 670
 671         /* Syntax-check value. */
 672         switch (o->valtype) {
 673         default:
 674         case 's':
 675             /* Just a string. */
 676             break;
 677         case '/':
 678             if (app_isdir(arg) > 0)
 679                 break;
 680             BIO_printf(bio_err, "%s: Not a directory: %s\n", prog, arg);
 681             return -1;
 682         case '<':
 683             /* Input file. */
 684             break;
 685         case '>':
 686             /* Output file. */
 687             break;
 688         case 'p':
 689         case 'n':
 690             if (!opt_int(arg, &ival)
 691                     || (o->valtype == 'p' && ival <= 0)) {
 692                 BIO_printf(bio_err,
 693                            "%s: Non-positive number \"%s\" for -%s\n",
 694                            prog, arg, o->name);
 695                 return -1;
 696             }
 697             break;
 698         case 'M':
 699             if (!opt_imax(arg, &imval)) {
 700                 BIO_printf(bio_err,
 701                            "%s: Invalid number \"%s\" for -%s\n",
 702                            prog, arg, o->name);
 703                 return -1;
 704             }
 705             break;
 706         case 'U':
 707             if (!opt_umax(arg, &umval)) {
 708                 BIO_printf(bio_err,
 709                            "%s: Invalid number \"%s\" for -%s\n",
 710                            prog, arg, o->name);
 711                 return -1;
 712             }
 713             break;
 714         case 'l':
 715             if (!opt_long(arg, &lval)) {
 716                 BIO_printf(bio_err,
 717                            "%s: Invalid number \"%s\" for -%s\n",
 718                            prog, arg, o->name);
 719                 return -1;
 720             }
 721             break;
 722         case 'u':
 723             if (!opt_ulong(arg, &ulval)) {
 724                 BIO_printf(bio_err,
 725                            "%s: Invalid number \"%s\" for -%s\n",
 726                            prog, arg, o->name);
 727                 return -1;
 728             }
 729             break;
 730         case 'c':
 731         case 'E':
 732         case 'F':
 733         case 'f':
 734             if (opt_format(arg,
 735                            o->valtype == 'c' ? OPT_FMT_PDS :
 736                            o->valtype == 'E' ? OPT_FMT_PDE :
 737                            o->valtype == 'F' ? OPT_FMT_PEMDER
 738                            : OPT_FMT_ANY, &ival))
 739                 break;
 740             BIO_printf(bio_err,
 741                        "%s: Invalid format \"%s\" for -%s\n",
 742                        prog, arg, o->name);
 743             return -1;
 744         }
 745
 746         /* Return the flag value. */
 747         return o->retval;
 748     }
 749     if (unknown != NULL) {
 750         dunno = p;
 751         return unknown->retval;
 752     }
 753     BIO_printf(bio_err, "%s: Option unknown option -%s\n", prog, p);
 754     return -1;
 755 }
 756
 757 /* Return the most recent flag parameter. */
 758 char *opt_arg(void)
 759 {
 760     return arg;
 761 }
 762
 763 /* Return the most recent flag. */
 764 char *opt_flag(void)
 765 {
 766     return flag;
 767 }
 768
 769 /* Return the unknown option. */
 770 char *opt_unknown(void)
 771 {
 772     return dunno;
 773 }
 774
 775 /* Return the rest of the arguments after parsing flags. */
 776 char **opt_rest(void)
 777 {
 778     return &argv[opt_index];
 779 }
 780
 781 /* How many items in remaining args? */
 782 int opt_num_rest(void)
 783 {
 784     int i = 0;
 785     char **pp;
 786
 787     for (pp = opt_rest(); *pp; pp++, i++)
 788         continue;
 789     return i;
 790 }
 791
 792 /* Return a string describing the parameter type. */
 793 static const char *valtype2param(const OPTIONS *o)
 794 {
 795     switch (o->valtype) {
 796     case 0:
 797     case '-':
 798         return "";
 799     case 's':
 800         return "val";
 801     case '/':
 802         return "dir";
 803     case '<':
 804         return "infile";
 805     case '>':
 806         return "outfile";
 807     case 'p':
 808         return "+int";
 809     case 'n':
 810         return "int";
 811     case 'l':
 812         return "long";
 813     case 'u':
 814         return "ulong";
 815     case 'E':
 816         return "PEM|DER|ENGINE";
 817     case 'F':
 818         return "PEM|DER";
 819     case 'f':
 820         return "format";
 821     case 'M':
 822         return "intmax";
 823     case 'U':
 824         return "uintmax";
 825     }
 826     return "parm";
 827 }
 828
 829 void opt_help(const OPTIONS *list)
 830 {
 831     const OPTIONS *o;
 832     int i;
 833     int standard_prolog;
 834     int width = 5;
 835     char start[80 + 1];
 836     char *p;
 837     const char *help;
 838
 839     /* Starts with its own help message? */
 840     standard_prolog = list[0].name != OPT_HELP_STR;
 841
 842     /* Find the widest help. */
 843     for (o = list; o->name; o++) {
 844         if (o->name == OPT_MORE_STR)
 845             continue;
 846         i = 2 + (int)strlen(o->name);
 847         if (o->valtype != '-')
 848             i += 1 + strlen(valtype2param(o));
 849         if (i < MAX_OPT_HELP_WIDTH && i > width)
 850             width = i;
 851         assert(i < (int)sizeof(start));
 852     }
 853
 854     if (standard_prolog)
 855         BIO_printf(bio_err, "Usage: %s [options]\nValid options are:\n",
 856                    prog);
 857
 858     /* Now let's print. */
 859     for (o = list; o->name; o++) {
 860         help = o->helpstr ? o->helpstr : "(No additional info)";
 861         if (o->name == OPT_HELP_STR) {
 862             BIO_printf(bio_err, help, prog);
 863             continue;
 864         }
 865
 866         /* Pad out prefix */
 867         memset(start, ' ', sizeof(start) - 1);
 868         start[sizeof(start) - 1] = '\0';
 869
 870         if (o->name == OPT_MORE_STR) {
 871             /* Continuation of previous line; pad and print. */
 872             start[width] = '\0';
 873             BIO_printf(bio_err, "%s  %s\n", start, help);
 874             continue;
 875         }
 876
 877         /* Build up the "-flag [param]" part. */
 878         p = start;
 879         *p++ = ' ';
 880         *p++ = '-';
 881         if (o->name[0])
 882             p += strlen(strcpy(p, o->name));
 883         else
 884             *p++ = '*';
 885         if (o->valtype != '-') {
 886             *p++ = ' ';
 887             p += strlen(strcpy(p, valtype2param(o)));
 888         }
 889         *p = ' ';
 890         if ((int)(p - start) >= MAX_OPT_HELP_WIDTH) {
 891             *p = '\0';
 892             BIO_printf(bio_err, "%s\n", start);
 893             memset(start, ' ', sizeof(start));
 894         }
 895         start[width] = '\0';
 896         BIO_printf(bio_err, "%s  %s\n", start, help);
 897     }
 898 }