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