apps/lib/opt.c

   1 /*
   2  * Copyright 2015-2020 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
  10 /*
  11  * This file is also used by the test suite. Do not #include "apps.h".
  12  */
  13 #include "opt.h"
  14 #include "fmt.h"
  15 #include "internal/nelem.h"
  16 #include <string.h>
  17 #if !defined(OPENSSL_SYS_MSDOS)
  18 # include <unistd.h>
  19 #endif
  20
  21 #include <stdlib.h>
  22 #include <errno.h>
  23 #include <ctype.h>
  24 #include <limits.h>
  25 #include <openssl/bio.h>
  26 #include <openssl/x509v3.h>
  27
  28 #define MAX_OPT_HELP_WIDTH 30
  29 const char OPT_HELP_STR[] = "-H";
  30 const char OPT_MORE_STR[] = "-M";
  31 const char OPT_SECTION_STR[] = "-S";
  32 const char OPT_PARAM_STR[] = "-P";
  33
  34 /* Our state */
  35 static char **argv;
  36 static int argc;
  37 static int opt_index;
  38 static char *arg;
  39 static char *flag;
  40 static char *dunno;
  41 static const OPTIONS *unknown;
  42 static const OPTIONS *opts;
  43 static char prog[40];
  44
  45 /*
  46  * Return the simple name of the program; removing various platform gunk.
  47  */
  48 #if defined(OPENSSL_SYS_WIN32)
  49 char *opt_progname(const char *argv0)
  50 {
  51     size_t i, n;
  52     const char *p;
  53     char *q;
  54
  55     /* find the last '/', '\' or ':' */
  56     for (p = argv0 + strlen(argv0); --p > argv0;)
  57         if (*p == '/' || *p == '\\' || *p == ':') {
  58             p++;
  59             break;
  60         }
  61
  62     /* Strip off trailing nonsense. */
  63     n = strlen(p);
  64     if (n > 4 &&
  65         (strcmp(&p[n - 4], ".exe") == 0 || strcmp(&p[n - 4], ".EXE") == 0))
  66         n -= 4;
  67
  68     /* Copy over the name, in lowercase. */
  69     if (n > sizeof(prog) - 1)
  70         n = sizeof(prog) - 1;
  71     for (q = prog, i = 0; i < n; i++, p++)
  72         *q++ = tolower((unsigned char)*p);
  73     *q = '\0';
  74     return prog;
  75 }
  76
  77 #elif defined(OPENSSL_SYS_VMS)
  78
  79 char *opt_progname(const char *argv0)
  80 {
  81     const char *p, *q;
  82
  83     /* Find last special character sys:[foo.bar]openssl */
  84     for (p = argv0 + strlen(argv0); --p > argv0;)
  85         if (*p == ':' || *p == ']' || *p == '>') {
  86             p++;
  87             break;
  88         }
  89
  90     q = strrchr(p, '.');
  91     strncpy(prog, p, sizeof(prog) - 1);
  92     prog[sizeof(prog) - 1] = '\0';
  93     if (q != NULL && q - p < sizeof(prog))
  94         prog[q - p] = '\0';
  95     return prog;
  96 }
  97
  98 #else
  99
 100 char *opt_progname(const char *argv0)
 101 {
 102     const char *p;
 103
 104     /* Could use strchr, but this is like the ones above. */
 105     for (p = argv0 + strlen(argv0); --p > argv0;)
 106         if (*p == '/') {
 107             p++;
 108             break;
 109         }
 110     strncpy(prog, p, sizeof(prog) - 1);
 111     prog[sizeof(prog) - 1] = '\0';
 112     return prog;
 113 }
 114 #endif
 115
 116 char *opt_getprog(void)
 117 {
 118     return prog;
 119 }
 120
 121 /* Set up the arg parsing. */
 122 char *opt_init(int ac, char **av, const OPTIONS *o)
 123 {
 124     /* Store state. */
 125     argc = ac;
 126     argv = av;
 127     opt_begin();
 128     opts = o;
 129     opt_progname(av[0]);
 130     unknown = NULL;
 131
 132     /* Check all options up until the PARAM marker (if present) */
 133     for (; o->name != NULL && o->name != OPT_PARAM_STR; ++o) {
 134 #ifndef NDEBUG
 135         const OPTIONS *next;
 136         int duplicated, i;
 137 #endif
 138
 139         if (o->name == OPT_HELP_STR
 140                 || o->name == OPT_MORE_STR
 141                 || o->name == OPT_SECTION_STR)
 142             continue;
 143 #ifndef NDEBUG
 144         i = o->valtype;
 145
 146         /* Make sure options are legit. */
 147         OPENSSL_assert(o->name[0] != '-');
 148         OPENSSL_assert(o->retval > 0);
 149         switch (i) {
 150         case   0: case '-': case '/': case '<': case '>': case 'E': case 'F':
 151         case 'M': case 'U': case 'f': case 'l': case 'n': case 'p': case 's':
 152         case 'u': case 'c': case ':':
 153             break;
 154         default:
 155             OPENSSL_assert(0);
 156         }
 157
 158         /* Make sure there are no duplicates. */
 159         for (next = o + 1; next->name; ++next) {
 160             /*
 161              * Some compilers inline strcmp and the assert string is too long.
 162              */
 163             duplicated = strcmp(o->name, next->name) == 0;
 164             OPENSSL_assert(!duplicated);
 165         }
 166 #endif
 167         if (o->name[0] == '\0') {
 168             OPENSSL_assert(unknown == NULL);
 169             unknown = o;
 170             OPENSSL_assert(unknown->valtype == 0 || unknown->valtype == '-');
 171         }
 172     }
 173     return prog;
 174 }
 175
 176 static OPT_PAIR formats[] = {
 177     {"PEM/DER", OPT_FMT_PEMDER},
 178     {"pkcs12", OPT_FMT_PKCS12},
 179     {"smime", OPT_FMT_SMIME},
 180     {"engine", OPT_FMT_ENGINE},
 181     {"msblob", OPT_FMT_MSBLOB},
 182     {"nss", OPT_FMT_NSS},
 183     {"text", OPT_FMT_TEXT},
 184     {"http", OPT_FMT_HTTP},
 185     {"pvk", OPT_FMT_PVK},
 186     {NULL}
 187 };
 188
 189 /* Print an error message about a failed format parse. */
 190 int opt_format_error(const char *s, unsigned long flags)
 191 {
 192     OPT_PAIR *ap;
 193
 194     if (flags == OPT_FMT_PEMDER) {
 195         opt_printf_stderr("%s: Bad format \"%s\"; must be pem or der\n",
 196                           prog, s);
 197     } else {
 198         opt_printf_stderr("%s: Bad format \"%s\"; must be one of:\n",
 199                           prog, s);
 200         for (ap = formats; ap->name; ap++)
 201             if (flags & ap->retval)
 202                 opt_printf_stderr("   %s\n", ap->name);
 203     }
 204     return 0;
 205 }
 206
 207 /* Parse a format string, put it into *result; return 0 on failure, else 1. */
 208 int opt_format(const char *s, unsigned long flags, int *result)
 209 {
 210     switch (*s) {
 211     default:
 212         return 0;
 213     case 'D':
 214     case 'd':
 215         if ((flags & OPT_FMT_PEMDER) == 0)
 216             return opt_format_error(s, flags);
 217         *result = FORMAT_ASN1;
 218         break;
 219     case 'T':
 220     case 't':
 221         if ((flags & OPT_FMT_TEXT) == 0)
 222             return opt_format_error(s, flags);
 223         *result = FORMAT_TEXT;
 224         break;
 225     case 'N':
 226     case 'n':
 227         if ((flags & OPT_FMT_NSS) == 0)
 228             return opt_format_error(s, flags);
 229         if (strcmp(s, "NSS") != 0 && strcmp(s, "nss") != 0)
 230             return opt_format_error(s, flags);
 231         *result = FORMAT_NSS;
 232         break;
 233     case 'S':
 234     case 's':
 235         if ((flags & OPT_FMT_SMIME) == 0)
 236             return opt_format_error(s, flags);
 237         *result = FORMAT_SMIME;
 238         break;
 239     case 'M':
 240     case 'm':
 241         if ((flags & OPT_FMT_MSBLOB) == 0)
 242             return opt_format_error(s, flags);
 243         *result = FORMAT_MSBLOB;
 244         break;
 245     case 'E':
 246     case 'e':
 247         if ((flags & OPT_FMT_ENGINE) == 0)
 248             return opt_format_error(s, flags);
 249         *result = FORMAT_ENGINE;
 250         break;
 251     case 'H':
 252     case 'h':
 253         if ((flags & OPT_FMT_HTTP) == 0)
 254             return opt_format_error(s, flags);
 255         *result = FORMAT_HTTP;
 256         break;
 257     case '1':
 258         if ((flags & OPT_FMT_PKCS12) == 0)
 259             return opt_format_error(s, flags);
 260         *result = FORMAT_PKCS12;
 261         break;
 262     case 'P':
 263     case 'p':
 264         if (s[1] == '\0' || strcmp(s, "PEM") == 0 || strcmp(s, "pem") == 0) {
 265             if ((flags & OPT_FMT_PEMDER) == 0)
 266                 return opt_format_error(s, flags);
 267             *result = FORMAT_PEM;
 268         } else if (strcmp(s, "PVK") == 0 || strcmp(s, "pvk") == 0) {
 269             if ((flags & OPT_FMT_PVK) == 0)
 270                 return opt_format_error(s, flags);
 271             *result = FORMAT_PVK;
 272         } else if (strcmp(s, "P12") == 0 || strcmp(s, "p12") == 0
 273                    || strcmp(s, "PKCS12") == 0 || strcmp(s, "pkcs12") == 0) {
 274             if ((flags & OPT_FMT_PKCS12) == 0)
 275                 return opt_format_error(s, flags);
 276             *result = FORMAT_PKCS12;
 277         } else {
 278             return 0;
 279         }
 280         break;
 281     }
 282     return 1;
 283 }
 284
 285 /* Parse a cipher name, put it in *EVP_CIPHER; return 0 on failure, else 1. */
 286 int opt_cipher(const char *name, const EVP_CIPHER **cipherp)
 287 {
 288     *cipherp = EVP_get_cipherbyname(name);
 289     if (*cipherp != NULL)
 290         return 1;
 291     opt_printf_stderr("%s: Unknown cipher: %s\n", prog, name);
 292     return 0;
 293 }
 294
 295 /*
 296  * Parse message digest name, put it in *EVP_MD; return 0 on failure, else 1.
 297  */
 298 int opt_md(const char *name, const EVP_MD **mdp)
 299 {
 300     *mdp = EVP_get_digestbyname(name);
 301     if (*mdp != NULL)
 302         return 1;
 303     opt_printf_stderr("%s: Unknown message digest: %s\n", prog, name);
 304     return 0;
 305 }
 306
 307 /* Look through a list of name/value pairs. */
 308 int opt_pair(const char *name, const OPT_PAIR* pairs, int *result)
 309 {
 310     const OPT_PAIR *pp;
 311
 312     for (pp = pairs; pp->name; pp++)
 313         if (strcmp(pp->name, name) == 0) {
 314             *result = pp->retval;
 315             return 1;
 316         }
 317     opt_printf_stderr("%s: Value must be one of:\n", prog);
 318     for (pp = pairs; pp->name; pp++)
 319         opt_printf_stderr("\t%s\n", pp->name);
 320     return 0;
 321 }
 322
 323 /* Parse an int, put it into *result; return 0 on failure, else 1. */
 324 int opt_int(const char *value, int *result)
 325 {
 326     long l;
 327
 328     if (!opt_long(value, &l))
 329         return 0;
 330     *result = (int)l;
 331     if (*result != l) {
 332         opt_printf_stderr("%s: Value \"%s\" outside integer range\n",
 333                           prog, value);
 334         return 0;
 335     }
 336     return 1;
 337 }
 338
 339 static void opt_number_error(const char *v)
 340 {
 341     size_t i = 0;
 342     struct strstr_pair_st {
 343         char *prefix;
 344         char *name;
 345     } b[] = {
 346         {"0x", "a hexadecimal"},
 347         {"0X", "a hexadecimal"},
 348         {"0", "an octal"}
 349     };
 350
 351     for (i = 0; i < OSSL_NELEM(b); i++) {
 352         if (strncmp(v, b[i].prefix, strlen(b[i].prefix)) == 0) {
 353             opt_printf_stderr("%s: Can't parse \"%s\" as %s number\n",
 354                               prog, v, b[i].name);
 355             return;
 356         }
 357     }
 358     opt_printf_stderr("%s: Can't parse \"%s\" as a number\n", prog, v);
 359     return;
 360 }
 361
 362 /* Parse a long, put it into *result; return 0 on failure, else 1. */
 363 int opt_long(const char *value, long *result)
 364 {
 365     int oerrno = errno;
 366     long l;
 367     char *endp;
 368
 369     errno = 0;
 370     l = strtol(value, &endp, 0);
 371     if (*endp
 372             || endp == value
 373             || ((l == LONG_MAX || l == LONG_MIN) && errno == ERANGE)
 374             || (l == 0 && errno != 0)) {
 375         opt_number_error(value);
 376         errno = oerrno;
 377         return 0;
 378     }
 379     *result = l;
 380     errno = oerrno;
 381     return 1;
 382 }
 383
 384 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L && \
 385     defined(INTMAX_MAX) && defined(UINTMAX_MAX) && \
 386     !defined(OPENSSL_NO_INTTYPES_H)
 387
 388 /* Parse an intmax_t, put it into *result; return 0 on failure, else 1. */
 389 int opt_imax(const char *value, intmax_t *result)
 390 {
 391     int oerrno = errno;
 392     intmax_t m;
 393     char *endp;
 394
 395     errno = 0;
 396     m = strtoimax(value, &endp, 0);
 397     if (*endp
 398             || endp == value
 399             || ((m == INTMAX_MAX || m == INTMAX_MIN) && errno == ERANGE)
 400             || (m == 0 && errno != 0)) {
 401         opt_number_error(value);
 402         errno = oerrno;
 403         return 0;
 404     }
 405     *result = m;
 406     errno = oerrno;
 407     return 1;
 408 }
 409
 410 /* Parse a uintmax_t, put it into *result; return 0 on failure, else 1. */
 411 int opt_umax(const char *value, uintmax_t *result)
 412 {
 413     int oerrno = errno;
 414     uintmax_t m;
 415     char *endp;
 416
 417     errno = 0;
 418     m = strtoumax(value, &endp, 0);
 419     if (*endp
 420             || endp == value
 421             || (m == UINTMAX_MAX && errno == ERANGE)
 422             || (m == 0 && errno != 0)) {
 423         opt_number_error(value);
 424         errno = oerrno;
 425         return 0;
 426     }
 427     *result = m;
 428     errno = oerrno;
 429     return 1;
 430 }
 431 #endif
 432
 433 /*
 434  * Parse an unsigned long, put it into *result; return 0 on failure, else 1.
 435  */
 436 int opt_ulong(const char *value, unsigned long *result)
 437 {
 438     int oerrno = errno;
 439     char *endptr;
 440     unsigned long l;
 441
 442     errno = 0;
 443     l = strtoul(value, &endptr, 0);
 444     if (*endptr
 445             || endptr == value
 446             || ((l == ULONG_MAX) && errno == ERANGE)
 447             || (l == 0 && errno != 0)) {
 448         opt_number_error(value);
 449         errno = oerrno;
 450         return 0;
 451     }
 452     *result = l;
 453     errno = oerrno;
 454     return 1;
 455 }
 456
 457 /*
 458  * We pass opt as an int but cast it to "enum range" so that all the
 459  * items in the OPT_V_ENUM enumeration are caught; this makes -Wswitch
 460  * in gcc do the right thing.
 461  */
 462 enum range { OPT_V_ENUM };
 463
 464 int opt_verify(int opt, X509_VERIFY_PARAM *vpm)
 465 {
 466     int i;
 467     ossl_intmax_t t = 0;
 468     ASN1_OBJECT *otmp;
 469     X509_PURPOSE *xptmp;
 470     const X509_VERIFY_PARAM *vtmp;
 471
 472     OPENSSL_assert(vpm != NULL);
 473     OPENSSL_assert(opt > OPT_V__FIRST);
 474     OPENSSL_assert(opt < OPT_V__LAST);
 475
 476     switch ((enum range)opt) {
 477     case OPT_V__FIRST:
 478     case OPT_V__LAST:
 479         return 0;
 480     case OPT_V_POLICY:
 481         otmp = OBJ_txt2obj(opt_arg(), 0);
 482         if (otmp == NULL) {
 483             opt_printf_stderr("%s: Invalid Policy %s\n", prog, opt_arg());
 484             return 0;
 485         }
 486         X509_VERIFY_PARAM_add0_policy(vpm, otmp);
 487         break;
 488     case OPT_V_PURPOSE:
 489         /* purpose name -> purpose index */
 490         i = X509_PURPOSE_get_by_sname(opt_arg());
 491         if (i < 0) {
 492             opt_printf_stderr("%s: Invalid purpose %s\n", prog, opt_arg());
 493             return 0;
 494         }
 495
 496         /* purpose index -> purpose object */
 497         xptmp = X509_PURPOSE_get0(i);
 498
 499         /* purpose object -> purpose value */
 500         i = X509_PURPOSE_get_id(xptmp);
 501
 502         if (!X509_VERIFY_PARAM_set_purpose(vpm, i)) {
 503             opt_printf_stderr("%s: Internal error setting purpose %s\n",
 504                               prog, opt_arg());
 505             return 0;
 506         }
 507         break;
 508     case OPT_V_VERIFY_NAME:
 509         vtmp = X509_VERIFY_PARAM_lookup(opt_arg());
 510         if (vtmp == NULL) {
 511             opt_printf_stderr("%s: Invalid verify name %s\n",
 512                               prog, opt_arg());
 513             return 0;
 514         }
 515         X509_VERIFY_PARAM_set1(vpm, vtmp);
 516         break;
 517     case OPT_V_VERIFY_DEPTH:
 518         i = atoi(opt_arg());
 519         if (i >= 0)
 520             X509_VERIFY_PARAM_set_depth(vpm, i);
 521         break;
 522     case OPT_V_VERIFY_AUTH_LEVEL:
 523         i = atoi(opt_arg());
 524         if (i >= 0)
 525             X509_VERIFY_PARAM_set_auth_level(vpm, i);
 526         break;
 527     case OPT_V_ATTIME:
 528         if (!opt_imax(opt_arg(), &t))
 529             return 0;
 530         if (t != (time_t)t) {
 531             opt_printf_stderr("%s: epoch time out of range %s\n",
 532                               prog, opt_arg());
 533             return 0;
 534         }
 535         X509_VERIFY_PARAM_set_time(vpm, (time_t)t);
 536         break;
 537     case OPT_V_VERIFY_HOSTNAME:
 538         if (!X509_VERIFY_PARAM_set1_host(vpm, opt_arg(), 0))
 539             return 0;
 540         break;
 541     case OPT_V_VERIFY_EMAIL:
 542         if (!X509_VERIFY_PARAM_set1_email(vpm, opt_arg(), 0))
 543             return 0;
 544         break;
 545     case OPT_V_VERIFY_IP:
 546         if (!X509_VERIFY_PARAM_set1_ip_asc(vpm, opt_arg()))
 547             return 0;
 548         break;
 549     case OPT_V_IGNORE_CRITICAL:
 550         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_IGNORE_CRITICAL);
 551         break;
 552     case OPT_V_ISSUER_CHECKS:
 553         /* NOP, deprecated */
 554         break;
 555     case OPT_V_CRL_CHECK:
 556         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_CRL_CHECK);
 557         break;
 558     case OPT_V_CRL_CHECK_ALL:
 559         X509_VERIFY_PARAM_set_flags(vpm,
 560                                     X509_V_FLAG_CRL_CHECK |
 561                                     X509_V_FLAG_CRL_CHECK_ALL);
 562         break;
 563     case OPT_V_POLICY_CHECK:
 564         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_POLICY_CHECK);
 565         break;
 566     case OPT_V_EXPLICIT_POLICY:
 567         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_EXPLICIT_POLICY);
 568         break;
 569     case OPT_V_INHIBIT_ANY:
 570         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_INHIBIT_ANY);
 571         break;
 572     case OPT_V_INHIBIT_MAP:
 573         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_INHIBIT_MAP);
 574         break;
 575     case OPT_V_X509_STRICT:
 576         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_X509_STRICT);
 577         break;
 578     case OPT_V_EXTENDED_CRL:
 579         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_EXTENDED_CRL_SUPPORT);
 580         break;
 581     case OPT_V_USE_DELTAS:
 582         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_USE_DELTAS);
 583         break;
 584     case OPT_V_POLICY_PRINT:
 585         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_NOTIFY_POLICY);
 586         break;
 587     case OPT_V_CHECK_SS_SIG:
 588         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_CHECK_SS_SIGNATURE);
 589         break;
 590     case OPT_V_TRUSTED_FIRST:
 591         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_TRUSTED_FIRST);
 592         break;
 593     case OPT_V_SUITEB_128_ONLY:
 594         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_SUITEB_128_LOS_ONLY);
 595         break;
 596     case OPT_V_SUITEB_128:
 597         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_SUITEB_128_LOS);
 598         break;
 599     case OPT_V_SUITEB_192:
 600         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_SUITEB_192_LOS);
 601         break;
 602     case OPT_V_PARTIAL_CHAIN:
 603         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_PARTIAL_CHAIN);
 604         break;
 605     case OPT_V_NO_ALT_CHAINS:
 606         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_NO_ALT_CHAINS);
 607         break;
 608     case OPT_V_NO_CHECK_TIME:
 609         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_NO_CHECK_TIME);
 610         break;
 611     case OPT_V_ALLOW_PROXY_CERTS:
 612         X509_VERIFY_PARAM_set_flags(vpm, X509_V_FLAG_ALLOW_PROXY_CERTS);
 613         break;
 614     }
 615     return 1;
 616
 617 }
 618
 619 void opt_begin(void)
 620 {
 621     opt_index = 1;
 622     arg = NULL;
 623     flag = NULL;
 624 }
 625
 626 /*
 627  * Parse the next flag (and value if specified), return 0 if done, -1 on
 628  * error, otherwise the flag's retval.
 629  */
 630 int opt_next(void)
 631 {
 632     char *p;
 633     const OPTIONS *o;
 634     int ival;
 635     long lval;
 636     unsigned long ulval;
 637     ossl_intmax_t imval;
 638     ossl_uintmax_t umval;
 639
 640     /* Look at current arg; at end of the list? */
 641     arg = NULL;
 642     p = argv[opt_index];
 643     if (p == NULL)
 644         return 0;
 645
 646     /* If word doesn't start with a -, we're done. */
 647     if (*p != '-')
 648         return 0;
 649
 650     /* Hit "--" ? We're done. */
 651     opt_index++;
 652     if (strcmp(p, "--") == 0)
 653         return 0;
 654
 655     /* Allow -nnn and --nnn */
 656     if (*++p == '-')
 657         p++;
 658     flag = p - 1;
 659
 660     /* If we have --flag=foo, snip it off */
 661     if ((arg = strchr(p, '=')) != NULL)
 662         *arg++ = '\0';
 663     for (o = opts; o->name; ++o) {
 664         /* If not this option, move on to the next one. */
 665         if (strcmp(p, o->name) != 0)
 666             continue;
 667
 668         /* If it doesn't take a value, make sure none was given. */
 669         if (o->valtype == 0 || o->valtype == '-') {
 670             if (arg) {
 671                 opt_printf_stderr("%s: Option -%s does not take a value\n",
 672                                   prog, p);
 673                 return -1;
 674             }
 675             return o->retval;
 676         }
 677
 678         /* Want a value; get the next param if =foo not used. */
 679         if (arg == NULL) {
 680             if (argv[opt_index] == NULL) {
 681                 opt_printf_stderr("%s: Option -%s needs a value\n",
 682                                   prog, o->name);
 683                 return -1;
 684             }
 685             arg = argv[opt_index++];
 686         }
 687
 688         /* Syntax-check value. */
 689         switch (o->valtype) {
 690         default:
 691         case 's':
 692         case ':':
 693             /* Just a string. */
 694             break;
 695         case '/':
 696             if (opt_isdir(arg) > 0)
 697                 break;
 698             opt_printf_stderr("%s: Not a directory: %s\n", prog, arg);
 699             return -1;
 700         case '<':
 701             /* Input file. */
 702             break;
 703         case '>':
 704             /* Output file. */
 705             break;
 706         case 'p':
 707         case 'n':
 708             if (!opt_int(arg, &ival)
 709                     || (o->valtype == 'p' && ival <= 0)) {
 710                 opt_printf_stderr("%s: Non-positive number \"%s\" for -%s\n",
 711                                   prog, arg, o->name);
 712                 return -1;
 713             }
 714             break;
 715         case 'M':
 716             if (!opt_imax(arg, &imval)) {
 717                 opt_printf_stderr("%s: Invalid number \"%s\" for -%s\n",
 718                                   prog, arg, o->name);
 719                 return -1;
 720             }
 721             break;
 722         case 'U':
 723             if (!opt_umax(arg, &umval)) {
 724                 opt_printf_stderr("%s: Invalid number \"%s\" for -%s\n",
 725                                   prog, arg, o->name);
 726                 return -1;
 727             }
 728             break;
 729         case 'l':
 730             if (!opt_long(arg, &lval)) {
 731                 opt_printf_stderr("%s: Invalid number \"%s\" for -%s\n",
 732                                   prog, arg, o->name);
 733                 return -1;
 734             }
 735             break;
 736         case 'u':
 737             if (!opt_ulong(arg, &ulval)) {
 738                 opt_printf_stderr("%s: Invalid number \"%s\" for -%s\n",
 739                                   prog, arg, o->name);
 740                 return -1;
 741             }
 742             break;
 743         case 'c':
 744         case 'E':
 745         case 'F':
 746         case 'f':
 747             if (opt_format(arg,
 748                            o->valtype == 'c' ? OPT_FMT_PDS :
 749                            o->valtype == 'E' ? OPT_FMT_PDE :
 750                            o->valtype == 'F' ? OPT_FMT_PEMDER
 751                            : OPT_FMT_ANY, &ival))
 752                 break;
 753             opt_printf_stderr("%s: Invalid format \"%s\" for -%s\n",
 754                               prog, arg, o->name);
 755             return -1;
 756         }
 757
 758         /* Return the flag value. */
 759         return o->retval;
 760     }
 761     if (unknown != NULL) {
 762         dunno = p;
 763         return unknown->retval;
 764     }
 765     opt_printf_stderr("%s: Unknown option: -%s\n", prog, p);
 766     return -1;
 767 }
 768
 769 /* Return the most recent flag parameter. */
 770 char *opt_arg(void)
 771 {
 772     return arg;
 773 }
 774
 775 /* Return the most recent flag. */
 776 char *opt_flag(void)
 777 {
 778     return flag;
 779 }
 780
 781 /* Return the unknown option. */
 782 char *opt_unknown(void)
 783 {
 784     return dunno;
 785 }
 786
 787 /* Return the rest of the arguments after parsing flags. */
 788 char **opt_rest(void)
 789 {
 790     return &argv[opt_index];
 791 }
 792
 793 /* How many items in remaining args? */
 794 int opt_num_rest(void)
 795 {
 796     int i = 0;
 797     char **pp;
 798
 799     for (pp = opt_rest(); *pp; pp++, i++)
 800         continue;
 801     return i;
 802 }
 803
 804 /* Return a string describing the parameter type. */
 805 static const char *valtype2param(const OPTIONS *o)
 806 {
 807     switch (o->valtype) {
 808     case 0:
 809     case '-':
 810         return "";
 811     case ':':
 812         return "uri";
 813     case 's':
 814         return "val";
 815     case '/':
 816         return "dir";
 817     case '<':
 818         return "infile";
 819     case '>':
 820         return "outfile";
 821     case 'p':
 822         return "+int";
 823     case 'n':
 824         return "int";
 825     case 'l':
 826         return "long";
 827     case 'u':
 828         return "ulong";
 829     case 'E':
 830         return "PEM|DER|ENGINE";
 831     case 'F':
 832         return "PEM|DER";
 833     case 'f':
 834         return "format";
 835     case 'M':
 836         return "intmax";
 837     case 'U':
 838         return "uintmax";
 839     }
 840     return "parm";
 841 }
 842
 843 void opt_print(const OPTIONS *o, int doingparams, int width)
 844 {
 845     const char* help;
 846     char start[80 + 1];
 847     char *p;
 848
 849         help = o->helpstr ? o->helpstr : "(No additional info)";
 850         if (o->name == OPT_HELP_STR) {
 851             opt_printf_stderr(help, prog);
 852             return;
 853         }
 854         if (o->name == OPT_SECTION_STR) {
 855             opt_printf_stderr("\n");
 856             opt_printf_stderr(help, prog);
 857             return;
 858         }
 859         if (o->name == OPT_PARAM_STR) {
 860             opt_printf_stderr("\nParameters:\n");
 861             return;
 862         }
 863
 864         /* Pad out prefix */
 865         memset(start, ' ', sizeof(start) - 1);
 866         start[sizeof(start) - 1] = '\0';
 867
 868         if (o->name == OPT_MORE_STR) {
 869             /* Continuation of previous line; pad and print. */
 870             start[width] = '\0';
 871             opt_printf_stderr("%s  %s\n", start, help);
 872             return;
 873         }
 874
 875         /* Build up the "-flag [param]" part. */
 876         p = start;
 877         *p++ = ' ';
 878         if (!doingparams)
 879             *p++ = '-';
 880         if (o->name[0])
 881             p += strlen(strcpy(p, o->name));
 882         else
 883             *p++ = '*';
 884         if (o->valtype != '-') {
 885             *p++ = ' ';
 886             p += strlen(strcpy(p, valtype2param(o)));
 887         }
 888         *p = ' ';
 889         if ((int)(p - start) >= MAX_OPT_HELP_WIDTH) {
 890             *p = '\0';
 891             opt_printf_stderr("%s\n", start);
 892             memset(start, ' ', sizeof(start));
 893         }
 894         start[width] = '\0';
 895         opt_printf_stderr("%s  %s\n", start, help);
 896 }
 897
 898 void opt_help(const OPTIONS *list)
 899 {
 900     const OPTIONS *o;
 901     int i, sawparams = 0, width = 5;
 902     int standard_prolog;
 903     char start[80 + 1];
 904
 905     /* Starts with its own help message? */
 906     standard_prolog = list[0].name != OPT_HELP_STR;
 907
 908     /* Find the widest help. */
 909     for (o = list; o->name; o++) {
 910         if (o->name == OPT_MORE_STR)
 911             continue;
 912         i = 2 + (int)strlen(o->name);
 913         if (o->valtype != '-')
 914             i += 1 + strlen(valtype2param(o));
 915         if (i < MAX_OPT_HELP_WIDTH && i > width)
 916             width = i;
 917         OPENSSL_assert(i < (int)sizeof(start));
 918     }
 919
 920     if (standard_prolog) {
 921         opt_printf_stderr("Usage: %s [options]\n", prog);
 922         if (list[0].name != OPT_SECTION_STR)
 923             opt_printf_stderr("Valid options are:\n", prog);
 924     }
 925
 926     /* Now let's print. */
 927     for (o = list; o->name; o++) {
 928         if (o->name == OPT_PARAM_STR)
 929             sawparams = 1;
 930         opt_print(o, sawparams, width);
 931     }
 932 }
 933
 934 /* opt_isdir section */
 935 #ifdef _WIN32
 936 # include <windows.h>
 937 int opt_isdir(const char *name)
 938 {
 939     DWORD attr;
 940 # if defined(UNICODE) || defined(_UNICODE)
 941     size_t i, len_0 = strlen(name) + 1;
 942     WCHAR tempname[MAX_PATH];
 943
 944     if (len_0 > MAX_PATH)
 945         return -1;
 946
 947 #  if !defined(_WIN32_WCE) || _WIN32_WCE>=101
 948     if (!MultiByteToWideChar(CP_ACP, 0, name, len_0, tempname, MAX_PATH))
 949 #  endif
 950         for (i = 0; i < len_0; i++)
 951             tempname[i] = (WCHAR)name[i];
 952
 953     attr = GetFileAttributes(tempname);
 954 # else
 955     attr = GetFileAttributes(name);
 956 # endif
 957     if (attr == INVALID_FILE_ATTRIBUTES)
 958         return -1;
 959     return ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0);
 960 }
 961 #else
 962 # include <sys/stat.h>
 963 # ifndef S_ISDIR
 964 #  if defined(_S_IFMT) && defined(_S_IFDIR)
 965 #   define S_ISDIR(a)   (((a) & _S_IFMT) == _S_IFDIR)
 966 #  else
 967 #   define S_ISDIR(a)   (((a) & S_IFMT) == S_IFDIR)
 968 #  endif
 969 # endif
 970
 971 int opt_isdir(const char *name)
 972 {
 973 # if defined(S_ISDIR)
 974     struct stat st;
 975
 976     if (stat(name, &st) == 0)
 977         return S_ISDIR(st.st_mode);
 978     else
 979         return -1;
 980 # else
 981     return -1;
 982 # endif
 983 }
 984 #endif