apps/opt.c

   1 /*
   2  * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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     {"netscape", OPT_FMT_NETSCAPE},
 172     {"nss", OPT_FMT_NSS},
 173     {"text", OPT_FMT_TEXT},
 174     {"http", OPT_FMT_HTTP},
 175     {"pvk", OPT_FMT_PVK},
 176     {NULL}
 177 };
 178
 179 /* Print an error message about a failed format parse. */
 180 int opt_format_error(const char *s, unsigned long flags)
 181 {
 182     OPT_PAIR *ap;
 183
 184     if (flags == OPT_FMT_PEMDER) {
 185         BIO_printf(bio_err, "%s: Bad format \"%s\"; must be pem or der\n",
 186                    prog, s);
 187     } else {
 188         BIO_printf(bio_err, "%s: Bad format \"%s\"; must be one of:\n",
 189                    prog, s);
 190         for (ap = formats; ap->name; ap++)
 191             if (flags & ap->retval)
 192                 BIO_printf(bio_err, "   %s\n", ap->name);
 193     }
 194     return 0;
 195 }
 196
 197 /* Parse a format string, put it into *result; return 0 on failure, else 1. */
 198 int opt_format(const char *s, unsigned long flags, int *result)
 199 {
 200     switch (*s) {
 201     default:
 202         return 0;
 203     case 'D':
 204     case 'd':
 205         if ((flags & OPT_FMT_PEMDER) == 0)
 206             return opt_format_error(s, flags);
 207         *result = FORMAT_ASN1;
 208         break;
 209     case 'T':
 210     case 't':
 211         if ((flags & OPT_FMT_TEXT) == 0)
 212             return opt_format_error(s, flags);
 213         *result = FORMAT_TEXT;
 214         break;
 215     case 'N':
 216     case 'n':
 217         if ((flags & OPT_FMT_NSS) == 0)
 218             return opt_format_error(s, flags);
 219         if (strcmp(s, "NSS") != 0 && strcmp(s, "nss") != 0)
 220             return opt_format_error(s, flags);
 221         *result = FORMAT_NSS;
 222         break;
 223     case 'S':
 224     case 's':
 225         if ((flags & OPT_FMT_SMIME) == 0)
 226             return opt_format_error(s, flags);
 227         *result = FORMAT_SMIME;
 228         break;
 229     case 'M':
 230     case 'm':
 231         if ((flags & OPT_FMT_MSBLOB) == 0)
 232             return opt_format_error(s, flags);
 233         *result = FORMAT_MSBLOB;
 234         break;
 235     case 'E':
 236     case 'e':
 237         if ((flags & OPT_FMT_ENGINE) == 0)
 238             return opt_format_error(s, flags);
 239         *result = FORMAT_ENGINE;
 240         break;
 241     case 'H':
 242     case 'h':
 243         if ((flags & OPT_FMT_HTTP) == 0)
 244             return opt_format_error(s, flags);
 245         *result = FORMAT_HTTP;
 246         break;
 247     case '1':
 248         if ((flags & OPT_FMT_PKCS12) == 0)
 249             return opt_format_error(s, flags);
 250         *result = FORMAT_PKCS12;
 251         break;
 252     case 'P':
 253     case 'p':
 254         if (s[1] == '\0' || strcmp(s, "PEM") == 0 || strcmp(s, "pem") == 0) {
 255             if ((flags & OPT_FMT_PEMDER) == 0)
 256                 return opt_format_error(s, flags);
 257             *result = FORMAT_PEM;
 258         } else if (strcmp(s, "PVK") == 0 || strcmp(s, "pvk") == 0) {
 259             if ((flags & OPT_FMT_PVK) == 0)
 260                 return opt_format_error(s, flags);
 261             *result = FORMAT_PVK;
 262         } else if (strcmp(s, "P12") == 0 || strcmp(s, "p12") == 0
 263                    || strcmp(s, "PKCS12") == 0 || strcmp(s, "pkcs12") == 0) {
 264             if ((flags & OPT_FMT_PKCS12) == 0)
 265                 return opt_format_error(s, flags);
 266             *result = FORMAT_PKCS12;
 267         } else {
 268             return 0;
 269         }
 270         break;
 271     }
 272     return 1;
 273 }
 274
 275 /* Parse a cipher name, put it in *EVP_CIPHER; return 0 on failure, else 1. */
 276 int opt_cipher(const char *name, const EVP_CIPHER **cipherp)
 277 {
 278     *cipherp = EVP_get_cipherbyname(name);
 279     if (*cipherp != NULL)
 280         return 1;
 281     BIO_printf(bio_err, "%s: Unrecognized flag %s\n", prog, name);
 282     return 0;
 283 }
 284
 285 /*
 286  * Parse message digest name, put it in *EVP_MD; return 0 on failure, else 1.
 287  */
 288 int opt_md(const char *name, const EVP_MD **mdp)
 289 {
 290     *mdp = EVP_get_digestbyname(name);
 291     if (*mdp != NULL)
 292         return 1;
 293     BIO_printf(bio_err, "%s: Unrecognized flag %s\n", prog, name);
 294     return 0;
 295 }
 296
 297 /* Look through a list of name/value pairs. */
 298 int opt_pair(const char *name, const OPT_PAIR* pairs, int *result)
 299 {
 300     const OPT_PAIR *pp;
 301
 302     for (pp = pairs; pp->name; pp++)
 303         if (strcmp(pp->name, name) == 0) {
 304             *result = pp->retval;
 305             return 1;
 306         }
 307     BIO_printf(bio_err, "%s: Value must be one of:\n", prog);
 308     for (pp = pairs; pp->name; pp++)
 309         BIO_printf(bio_err, "\t%s\n", pp->name);
 310     return 0;
 311 }
 312
 313 /* Parse an int, put it into *result; return 0 on failure, else 1. */
 314 int opt_int(const char *value, int *result)
 315 {
 316     long l;
 317
 318     if (!opt_long(value, &l))
 319         return 0;
 320     *result = (int)l;
 321     if (*result != l) {
 322         BIO_printf(bio_err, "%s: Value \"%s\" outside integer range\n",
 323                    prog, value);
 324         return 0;
 325     }
 326     return 1;
 327 }
 328
 329 static void opt_number_error(const char *v)
 330 {
 331     size_t i = 0;
 332     struct strstr_pair_st {
 333         char *prefix;
 334         char *name;
 335     } b[] = {
 336         {"0x", "a hexadecimal"},
 337         {"0X", "a hexadecimal"},
 338         {"0", "an octal"}
 339     };
 340
 341     for (i = 0; i < OSSL_NELEM(b); i++) {
 342         if (strncmp(v, b[i].prefix, strlen(b[i].prefix)) == 0) {
 343             BIO_printf(bio_err,
 344                        "%s: Can't parse \"%s\" as %s number\n",
 345                        prog, v, b[i].name);
 346             return;
 347         }
 348     }
 349     BIO_printf(bio_err, "%s: Can't parse \"%s\" as a number\n", prog, v);
 350     return;
 351 }
 352
 353 /* Parse a long, put it into *result; return 0 on failure, else 1. */
 354 int opt_long(const char *value, long *result)
 355 {
 356     int oerrno = errno;
 357     long l;
 358     char *endp;
 359
 360     errno = 0;
 361     l = strtol(value, &endp, 0);
 362     if (*endp
 363             || endp == value
 364             || ((l == LONG_MAX || l == LONG_MIN) && errno == ERANGE)
 365             || (l == 0 && errno != 0)) {
 366         opt_number_error(value);
 367         errno = oerrno;
 368         return 0;
 369     }
 370     *result = l;
 371     errno = oerrno;
 372     return 1;
 373 }
 374
 375 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L && \
 376     defined(INTMAX_MAX) && defined(UINTMAX_MAX)
 377
 378 /* Parse an intmax_t, put it into *result; return 0 on failure, else 1. */
 379 int opt_imax(const char *value, intmax_t *result)
 380 {
 381     int oerrno = errno;
 382     intmax_t m;
 383     char *endp;
 384
 385     errno = 0;
 386     m = strtoimax(value, &endp, 0);
 387     if (*endp
 388             || endp == value
 389             || ((m == INTMAX_MAX || m == INTMAX_MIN) && errno == ERANGE)
 390             || (m == 0 && errno != 0)) {
 391         opt_number_error(value);
 392         errno = oerrno;
 393         return 0;
 394     }
 395     *result = m;
 396     errno = oerrno;
 397     return 1;
 398 }
 399
 400 /* Parse a uintmax_t, put it into *result; return 0 on failure, else 1. */
 401 int opt_umax(const char *value, uintmax_t *result)
 402 {
 403     int oerrno = errno;
 404     uintmax_t m;
 405     char *endp;
 406
 407     errno = 0;
 408     m = strtoumax(value, &endp, 0);
 409     if (*endp
 410             || endp == value
 411             || (m == UINTMAX_MAX && errno == ERANGE)
 412             || (m == 0 && errno != 0)) {
 413         opt_number_error(value);
 414         errno = oerrno;
 415         return 0;
 416     }
 417     *result = m;
 418     errno = oerrno;
 419     return 1;
 420 }
 421 #endif
 422
 423 /*
 424  * Parse an unsigned long, put it into *result; return 0 on failure, else 1.
 425  */
 426 int opt_ulong(const char *value, unsigned long *result)
 427 {
 428     int oerrno = errno;
 429     char *endptr;
 430     unsigned long l;
 431
 432     errno = 0;
 433     l = strtoul(value, &endptr, 0);
 434     if (*endptr
 435             || endptr == value
 436             || ((l == ULONG_MAX) && errno == ERANGE)
 437             || (l == 0 && errno != 0)) {
 438         opt_number_error(value);
 439         errno = oerrno;
 440         return 0;
 441     }
 442     *result = l;
 443     errno = oerrno;
 444     return 1;
 445 }
 446
 447 /*
 448  * We pass opt as an int but cast it to "enum range" so that all the
 449  * items in the OPT_V_ENUM enumeration are caught; this makes -Wswitch
 450  * in gcc do the right thing.
 451  */
 452 enum range { OPT_V_ENUM };
 453
 454 int opt_verify(int opt, X509_VERIFY_PARAM *vpm)
 455 {
 456     int i;
 457     ossl_intmax_t t = 0;
 458     ASN1_OBJECT *otmp;
 459     X509_PURPOSE *xptmp;
 460     const X509_VERIFY_PARAM *vtmp;
 461
 462     assert(vpm != NULL);
 463     assert(opt > OPT_V__FIRST);
 464     assert(opt < OPT_V__LAST);
 465
 466     switch ((enum range)opt) {
 467     case OPT_V__FIRST:
 468     case OPT_V__LAST:
 469         return 0;
 470     case OPT_V_POLICY:
 471         otmp = OBJ_txt2obj(opt_arg(), 0);
 472         if (otmp == NULL) {
 473             BIO_printf(bio_err, "%s: Invalid Policy %s\n", prog, opt_arg());
 474             return 0;
 475         }
 476         X509_VERIFY_PARAM_add0_policy(vpm, otmp);
 477         break;
 478     case OPT_V_PURPOSE:
 479         /* purpose name -> purpose index */
 480         i = X509_PURPOSE_get_by_sname(opt_arg());
 481         if (i < 0) {
 482             BIO_printf(bio_err, "%s: Invalid purpose %s\n", prog, opt_arg());
 483             return 0;
 484         }
 485
 486         /* purpose index -> purpose object */
 487         xptmp = X509_PURPOSE_get0(i);
 488
 489         /* purpose object -> purpose value */
 490         i = X509_PURPOSE_get_id(xptmp);
 491
 492         if (!X509_VERIFY_PARAM_set_purpose(vpm, i)) {
 493             BIO_printf(bio_err,
 494                        "%s: Internal error setting purpose %s\n",
 495                        prog, opt_arg());
 496             return 0;
 497         }
 498         break;
 499     case OPT_V_VERIFY_NAME:
 500         vtmp = X509_VERIFY_PARAM_lookup(opt_arg());
 501         if (vtmp == NULL) {
 502             BIO_printf(bio_err, "%s: Invalid verify name %s\n",
 503                        prog, opt_arg());
 504             return 0;
 505         }
 506         X509_VERIFY_PARAM_set1(vpm, vtmp);
 507         break;
 508     case OPT_V_VERIFY_DEPTH:
 509         i = atoi(opt_arg());
 510         if (i >= 0)
 511             X509_VERIFY_PARAM_set_depth(vpm, i);
 512         break;
 513     case OPT_V_VERIFY_AUTH_LEVEL:
 514         i = atoi(opt_arg());
 515         if (i >= 0)
 516             X509_VERIFY_PARAM_set_auth_level(vpm, i);
 517         break;
 518     case OPT_V_ATTIME:
 519         if (!opt_imax(opt_arg(), &t))
 520             return 0;
 521         if (t != (time_t)t) {
 522             BIO_printf(bio_err, "%s: epoch time out of range %s\n",
 523                        prog, opt_arg());
 524             return 0;
 525         }
 526         X509_VERIFY_PARAM_set_time(vpm, (time_t)t);
 527         break;
 528     case OPT_V_VERIFY_HOSTNAME:
 529         if (!X509_VERIFY_PARAM_set1_host(vpm, opt_arg(), 0))
 530             return 0;
 531         break;
 532     case OPT_V_VERIFY_EMAIL:
 533         if (!X509_VERIFY_PARAM_set1_email(vpm, opt_arg(), 0))
 534             return 0;
 535         break;
 536     case OPT_V_VERIFY_IP:
 537         if (!X509_VERIFY_PARAM_set1_ip_asc(vpm, opt_arg()))
 538             return 0;
 539         break;
 540     case OPT_V_IGNORE_CRITICAL:
 541         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_IGNORE_CRITICAL);
 542         break;
 543     case OPT_V_ISSUER_CHECKS:
 544         /* NOP, deprecated */
 545         break;
 546     case OPT_V_CRL_CHECK:
 547         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_CRL_CHECK);
 548         break;
 549     case OPT_V_CRL_CHECK_ALL:
 550         X509_VERIFY_PARAM_set_flags(vpm,
 551                                     X509_V_FLAG_CRL_CHECK |
 552                                     X509_V_FLAG_CRL_CHECK_ALL);
 553         break;
 554     case OPT_V_POLICY_CHECK:
 555         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_POLICY_CHECK);
 556         break;
 557     case OPT_V_EXPLICIT_POLICY:
 558         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_EXPLICIT_POLICY);
 559         break;
 560     case OPT_V_INHIBIT_ANY:
 561         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_INHIBIT_ANY);
 562         break;
 563     case OPT_V_INHIBIT_MAP:
 564         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_INHIBIT_MAP);
 565         break;
 566     case OPT_V_X509_STRICT:
 567         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_X509_STRICT);
 568         break;
 569     case OPT_V_EXTENDED_CRL:
 570         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_EXTENDED_CRL_SUPPORT);
 571         break;
 572     case OPT_V_USE_DELTAS:
 573         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_USE_DELTAS);
 574         break;
 575     case OPT_V_POLICY_PRINT:
 576         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_NOTIFY_POLICY);
 577         break;
 578     case OPT_V_CHECK_SS_SIG:
 579         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_CHECK_SS_SIGNATURE);
 580         break;
 581     case OPT_V_TRUSTED_FIRST:
 582         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_TRUSTED_FIRST);
 583         break;
 584     case OPT_V_SUITEB_128_ONLY:
 585         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_SUITEB_128_LOS_ONLY);
 586         break;
 587     case OPT_V_SUITEB_128:
 588         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_SUITEB_128_LOS);
 589         break;
 590     case OPT_V_SUITEB_192:
 591         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_SUITEB_192_LOS);
 592         break;
 593     case OPT_V_PARTIAL_CHAIN:
 594         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_PARTIAL_CHAIN);
 595         break;
 596     case OPT_V_NO_ALT_CHAINS:
 597         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_NO_ALT_CHAINS);
 598         break;
 599     case OPT_V_NO_CHECK_TIME:
 600         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_NO_CHECK_TIME);
 601         break;
 602     case OPT_V_ALLOW_PROXY_CERTS:
 603         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_ALLOW_PROXY_CERTS);
 604         break;
 605     }
 606     return 1;
 607
 608 }
 609
 610 /*
 611  * Parse the next flag (and value if specified), return 0 if done, -1 on
 612  * error, otherwise the flag's retval.
 613  */
 614 int opt_next(void)
 615 {
 616     char *p;
 617     const OPTIONS *o;
 618     int ival;
 619     long lval;
 620     unsigned long ulval;
 621     ossl_intmax_t imval;
 622     ossl_uintmax_t umval;
 623
 624     /* Look at current arg; at end of the list? */
 625     arg = NULL;
 626     p = argv[opt_index];
 627     if (p == NULL)
 628         return 0;
 629
 630     /* If word doesn't start with a -, we're done. */
 631     if (*p != '-')
 632         return 0;
 633
 634     /* Hit "--" ? We're done. */
 635     opt_index++;
 636     if (strcmp(p, "--") == 0)
 637         return 0;
 638
 639     /* Allow -nnn and --nnn */
 640     if (*++p == '-')
 641         p++;
 642     flag = p - 1;
 643
 644     /* If we have --flag=foo, snip it off */
 645     if ((arg = strchr(p, '=')) != NULL)
 646         *arg++ = '\0';
 647     for (o = opts; o->name; ++o) {
 648         /* If not this option, move on to the next one. */
 649         if (strcmp(p, o->name) != 0)
 650             continue;
 651
 652         /* If it doesn't take a value, make sure none was given. */
 653         if (o->valtype == 0 || o->valtype == '-') {
 654             if (arg) {
 655                 BIO_printf(bio_err,
 656                            "%s: Option -%s does not take a value\n", prog, p);
 657                 return -1;
 658             }
 659             return o->retval;
 660         }
 661
 662         /* Want a value; get the next param if =foo not used. */
 663         if (arg == NULL) {
 664             if (argv[opt_index] == NULL) {
 665                 BIO_printf(bio_err,
 666                            "%s: Option -%s needs a value\n", prog, o->name);
 667                 return -1;
 668             }
 669             arg = argv[opt_index++];
 670         }
 671
 672         /* Syntax-check value. */
 673         switch (o->valtype) {
 674         default:
 675         case 's':
 676             /* Just a string. */
 677             break;
 678         case '/':
 679             if (app_isdir(arg) > 0)
 680                 break;
 681             BIO_printf(bio_err, "%s: Not a directory: %s\n", prog, arg);
 682             return -1;
 683         case '<':
 684             /* Input file. */
 685             break;
 686         case '>':
 687             /* Output file. */
 688             break;
 689         case 'p':
 690         case 'n':
 691             if (!opt_int(arg, &ival)
 692                     || (o->valtype == 'p' && ival <= 0)) {
 693                 BIO_printf(bio_err,
 694                            "%s: Non-positive number \"%s\" for -%s\n",
 695                            prog, arg, o->name);
 696                 return -1;
 697             }
 698             break;
 699         case 'M':
 700             if (!opt_imax(arg, &imval)) {
 701                 BIO_printf(bio_err,
 702                            "%s: Invalid number \"%s\" for -%s\n",
 703                            prog, arg, o->name);
 704                 return -1;
 705             }
 706             break;
 707         case 'U':
 708             if (!opt_umax(arg, &umval)) {
 709                 BIO_printf(bio_err,
 710                            "%s: Invalid number \"%s\" for -%s\n",
 711                            prog, arg, o->name);
 712                 return -1;
 713             }
 714             break;
 715         case 'l':
 716             if (!opt_long(arg, &lval)) {
 717                 BIO_printf(bio_err,
 718                            "%s: Invalid number \"%s\" for -%s\n",
 719                            prog, arg, o->name);
 720                 return -1;
 721             }
 722             break;
 723         case 'u':
 724             if (!opt_ulong(arg, &ulval)) {
 725                 BIO_printf(bio_err,
 726                            "%s: Invalid number \"%s\" for -%s\n",
 727                            prog, arg, o->name);
 728                 return -1;
 729             }
 730             break;
 731         case 'c':
 732         case 'E':
 733         case 'F':
 734         case 'f':
 735             if (opt_format(arg,
 736                            o->valtype == 'c' ? OPT_FMT_PDS :
 737                            o->valtype == 'E' ? OPT_FMT_PDE :
 738                            o->valtype == 'F' ? OPT_FMT_PEMDER
 739                            : OPT_FMT_ANY, &ival))
 740                 break;
 741             BIO_printf(bio_err,
 742                        "%s: Invalid format \"%s\" for -%s\n",
 743                        prog, arg, o->name);
 744             return -1;
 745         }
 746
 747         /* Return the flag value. */
 748         return o->retval;
 749     }
 750     if (unknown != NULL) {
 751         dunno = p;
 752         return unknown->retval;
 753     }
 754     BIO_printf(bio_err, "%s: Option unknown option -%s\n", prog, p);
 755     return -1;
 756 }
 757
 758 /* Return the most recent flag parameter. */
 759 char *opt_arg(void)
 760 {
 761     return arg;
 762 }
 763
 764 /* Return the most recent flag. */
 765 char *opt_flag(void)
 766 {
 767     return flag;
 768 }
 769
 770 /* Return the unknown option. */
 771 char *opt_unknown(void)
 772 {
 773     return dunno;
 774 }
 775
 776 /* Return the rest of the arguments after parsing flags. */
 777 char **opt_rest(void)
 778 {
 779     return &argv[opt_index];
 780 }
 781
 782 /* How many items in remaining args? */
 783 int opt_num_rest(void)
 784 {
 785     int i = 0;
 786     char **pp;
 787
 788     for (pp = opt_rest(); *pp; pp++, i++)
 789         continue;
 790     return i;
 791 }
 792
 793 /* Return a string describing the parameter type. */
 794 static const char *valtype2param(const OPTIONS *o)
 795 {
 796     switch (o->valtype) {
 797     case 0:
 798     case '-':
 799         return "";
 800     case 's':
 801         return "val";
 802     case '/':
 803         return "dir";
 804     case '<':
 805         return "infile";
 806     case '>':
 807         return "outfile";
 808     case 'p':
 809         return "+int";
 810     case 'n':
 811         return "int";
 812     case 'l':
 813         return "long";
 814     case 'u':
 815         return "ulong";
 816     case 'E':
 817         return "PEM|DER|ENGINE";
 818     case 'F':
 819         return "PEM|DER";
 820     case 'f':
 821         return "format";
 822     case 'M':
 823         return "intmax";
 824     case 'U':
 825         return "uintmax";
 826     }
 827     return "parm";
 828 }
 829
 830 void opt_help(const OPTIONS *list)
 831 {
 832     const OPTIONS *o;
 833     int i;
 834     int standard_prolog;
 835     int width = 5;
 836     char start[80 + 1];
 837     char *p;
 838     const char *help;
 839
 840     /* Starts with its own help message? */
 841     standard_prolog = list[0].name != OPT_HELP_STR;
 842
 843     /* Find the widest help. */
 844     for (o = list; o->name; o++) {
 845         if (o->name == OPT_MORE_STR)
 846             continue;
 847         i = 2 + (int)strlen(o->name);
 848         if (o->valtype != '-')
 849             i += 1 + strlen(valtype2param(o));
 850         if (i < MAX_OPT_HELP_WIDTH && i > width)
 851             width = i;
 852         assert(i < (int)sizeof(start));
 853     }
 854
 855     if (standard_prolog)
 856         BIO_printf(bio_err, "Usage: %s [options]\nValid options are:\n",
 857                    prog);
 858
 859     /* Now let's print. */
 860     for (o = list; o->name; o++) {
 861         help = o->helpstr ? o->helpstr : "(No additional info)";
 862         if (o->name == OPT_HELP_STR) {
 863             BIO_printf(bio_err, help, prog);
 864             continue;
 865         }
 866
 867         /* Pad out prefix */
 868         memset(start, ' ', sizeof(start) - 1);
 869         start[sizeof(start) - 1] = '\0';
 870
 871         if (o->name == OPT_MORE_STR) {
 872             /* Continuation of previous line; pad and print. */
 873             start[width] = '\0';
 874             BIO_printf(bio_err, "%s  %s\n", start, help);
 875             continue;
 876         }
 877
 878         /* Build up the "-flag [param]" part. */
 879         p = start;
 880         *p++ = ' ';
 881         *p++ = '-';
 882         if (o->name[0])
 883             p += strlen(strcpy(p, o->name));
 884         else
 885             *p++ = '*';
 886         if (o->valtype != '-') {
 887             *p++ = ' ';
 888             p += strlen(strcpy(p, valtype2param(o)));
 889         }
 890         *p = ' ';
 891         if ((int)(p - start) >= MAX_OPT_HELP_WIDTH) {
 892             *p = '\0';
 893             BIO_printf(bio_err, "%s\n", start);
 894             memset(start, ' ', sizeof(start));
 895         }
 896         start[width] = '\0';
 897         BIO_printf(bio_err, "%s  %s\n", start, help);
 898     }
 899 }