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v3_utl.c

/* v3_utl.c */
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
 * project.
 */
/* ====================================================================
 * Copyright (c) 1999-2003 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */
/* X509 v3 extension utilities */


#include <stdio.h>
#include <ctype.h>
#include "cryptlib.h"
#include <openssl/conf.h>
#include <openssl/x509v3.h>
#include <openssl/bn.h>

static char *strip_spaces(char *name);
static int sk_strcmp(const char * const *a, const char * const *b);
static STACK *get_email(X509_NAME *name, GENERAL_NAMES *gens);
static void str_free(void *str);
static int append_ia5(STACK **sk, ASN1_IA5STRING *email);

static int ipv4_from_asc(unsigned char *v4, const char *in);
static int ipv6_from_asc(unsigned char *v6, const char *in);
static int ipv6_cb(const char *elem, int len, void *usr);
static int ipv6_hex(unsigned char *out, const char *in, int inlen);

/* Add a CONF_VALUE name value pair to stack */

int X509V3_add_value(const char *name, const char *value,
                                    STACK_OF(CONF_VALUE) **extlist)
{
      CONF_VALUE *vtmp = NULL;
      char *tname = NULL, *tvalue = NULL;
      if(name && !(tname = BUF_strdup(name))) goto err;
      if(value && !(tvalue = BUF_strdup(value))) goto err;;
      if(!(vtmp = (CONF_VALUE *)OPENSSL_malloc(sizeof(CONF_VALUE)))) goto err;
      if(!*extlist && !(*extlist = sk_CONF_VALUE_new_null())) goto err;
      vtmp->section = NULL;
      vtmp->name = tname;
      vtmp->value = tvalue;
      if(!sk_CONF_VALUE_push(*extlist, vtmp)) goto err;
      return 1;
      err:
      X509V3err(X509V3_F_X509V3_ADD_VALUE,ERR_R_MALLOC_FAILURE);
      if(vtmp) OPENSSL_free(vtmp);
      if(tname) OPENSSL_free(tname);
      if(tvalue) OPENSSL_free(tvalue);
      return 0;
}

int X509V3_add_value_uchar(const char *name, const unsigned char *value,
                     STACK_OF(CONF_VALUE) **extlist)
    {
    return X509V3_add_value(name,(const char *)value,extlist);
    }

/* Free function for STACK_OF(CONF_VALUE) */

void X509V3_conf_free(CONF_VALUE *conf)
{
      if(!conf) return;
      if(conf->name) OPENSSL_free(conf->name);
      if(conf->value) OPENSSL_free(conf->value);
      if(conf->section) OPENSSL_free(conf->section);
      OPENSSL_free(conf);
}

int X509V3_add_value_bool(const char *name, int asn1_bool,
                                    STACK_OF(CONF_VALUE) **extlist)
{
      if(asn1_bool) return X509V3_add_value(name, "TRUE", extlist);
      return X509V3_add_value(name, "FALSE", extlist);
}

int X509V3_add_value_bool_nf(char *name, int asn1_bool,
                                    STACK_OF(CONF_VALUE) **extlist)
{
      if(asn1_bool) return X509V3_add_value(name, "TRUE", extlist);
      return 1;
}


char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, ASN1_ENUMERATED *a)
{
      BIGNUM *bntmp = NULL;
      char *strtmp = NULL;
      if(!a) return NULL;
      if(!(bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) ||
          !(strtmp = BN_bn2dec(bntmp)) )
            X509V3err(X509V3_F_I2S_ASN1_ENUMERATED,ERR_R_MALLOC_FAILURE);
      BN_free(bntmp);
      return strtmp;
}

char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, ASN1_INTEGER *a)
{
      BIGNUM *bntmp = NULL;
      char *strtmp = NULL;
      if(!a) return NULL;
      if(!(bntmp = ASN1_INTEGER_to_BN(a, NULL)) ||
          !(strtmp = BN_bn2dec(bntmp)) )
            X509V3err(X509V3_F_I2S_ASN1_INTEGER,ERR_R_MALLOC_FAILURE);
      BN_free(bntmp);
      return strtmp;
}

ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, char *value)
{
      BIGNUM *bn = NULL;
      ASN1_INTEGER *aint;
      int isneg, ishex;
      int ret;
      if (!value) {
            X509V3err(X509V3_F_S2I_ASN1_INTEGER,X509V3_R_INVALID_NULL_VALUE);
            return 0;
      }
      bn = BN_new();
      if (value[0] == '-') {
            value++;
            isneg = 1;
      } else isneg = 0;

      if (value[0] == '0' && ((value[1] == 'x') || (value[1] == 'X'))) {
            value += 2;
            ishex = 1;
      } else ishex = 0;

      if (ishex) ret = BN_hex2bn(&bn, value);
      else ret = BN_dec2bn(&bn, value);

      if (!ret || value[ret]) {
            BN_free(bn);
            X509V3err(X509V3_F_S2I_ASN1_INTEGER,X509V3_R_BN_DEC2BN_ERROR);
            return 0;
      }

      if (isneg && BN_is_zero(bn)) isneg = 0;

      aint = BN_to_ASN1_INTEGER(bn, NULL);
      BN_free(bn);
      if (!aint) {
            X509V3err(X509V3_F_S2I_ASN1_INTEGER,X509V3_R_BN_TO_ASN1_INTEGER_ERROR);
            return 0;
      }
      if (isneg) aint->type |= V_ASN1_NEG;
      return aint;
}

int X509V3_add_value_int(const char *name, ASN1_INTEGER *aint,
           STACK_OF(CONF_VALUE) **extlist)
{
      char *strtmp;
      int ret;
      if(!aint) return 1;
      if(!(strtmp = i2s_ASN1_INTEGER(NULL, aint))) return 0;
      ret = X509V3_add_value(name, strtmp, extlist);
      OPENSSL_free(strtmp);
      return ret;
}

int X509V3_get_value_bool(CONF_VALUE *value, int *asn1_bool)
{
      char *btmp;
      if(!(btmp = value->value)) goto err;
      if(!strcmp(btmp, "TRUE") || !strcmp(btmp, "true")
             || !strcmp(btmp, "Y") || !strcmp(btmp, "y")
            || !strcmp(btmp, "YES") || !strcmp(btmp, "yes")) {
            *asn1_bool = 0xff;
            return 1;
      } else if(!strcmp(btmp, "FALSE") || !strcmp(btmp, "false")
             || !strcmp(btmp, "N") || !strcmp(btmp, "n")
            || !strcmp(btmp, "NO") || !strcmp(btmp, "no")) {
            *asn1_bool = 0;
            return 1;
      }
      err:
      X509V3err(X509V3_F_X509V3_GET_VALUE_BOOL,X509V3_R_INVALID_BOOLEAN_STRING);
      X509V3_conf_err(value);
      return 0;
}

int X509V3_get_value_int(CONF_VALUE *value, ASN1_INTEGER **aint)
{
      ASN1_INTEGER *itmp;
      if(!(itmp = s2i_ASN1_INTEGER(NULL, value->value))) {
            X509V3_conf_err(value);
            return 0;
      }
      *aint = itmp;
      return 1;
}

#define HDR_NAME  1
#define HDR_VALUE 2

/*#define DEBUG*/

STACK_OF(CONF_VALUE) *X509V3_parse_list(const char *line)
{
      char *p, *q, c;
      char *ntmp, *vtmp;
      STACK_OF(CONF_VALUE) *values = NULL;
      char *linebuf;
      int state;
      /* We are going to modify the line so copy it first */
      linebuf = BUF_strdup(line);
      state = HDR_NAME;
      ntmp = NULL;
      /* Go through all characters */
      for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) {

            switch(state) {
                  case HDR_NAME:
                  if(c == ':') {
                        state = HDR_VALUE;
                        *p = 0;
                        ntmp = strip_spaces(q);
                        if(!ntmp) {
                              X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);
                              goto err;
                        }
                        q = p + 1;
                  } else if(c == ',') {
                        *p = 0;
                        ntmp = strip_spaces(q);
                        q = p + 1;
#if 0
                        printf("%s\n", ntmp);
#endif
                        if(!ntmp) {
                              X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);
                              goto err;
                        }
                        X509V3_add_value(ntmp, NULL, &values);
                  }
                  break ;

                  case HDR_VALUE:
                  if(c == ',') {
                        state = HDR_NAME;
                        *p = 0;
                        vtmp = strip_spaces(q);
#if 0
                        printf("%s\n", ntmp);
#endif
                        if(!vtmp) {
                              X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_VALUE);
                              goto err;
                        }
                        X509V3_add_value(ntmp, vtmp, &values);
                        ntmp = NULL;
                        q = p + 1;
                  }

            }
      }

      if(state == HDR_VALUE) {
            vtmp = strip_spaces(q);
#if 0
            printf("%s=%s\n", ntmp, vtmp);
#endif
            if(!vtmp) {
                  X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_VALUE);
                  goto err;
            }
            X509V3_add_value(ntmp, vtmp, &values);
      } else {
            ntmp = strip_spaces(q);
#if 0
            printf("%s\n", ntmp);
#endif
            if(!ntmp) {
                  X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);
                  goto err;
            }
            X509V3_add_value(ntmp, NULL, &values);
      }
OPENSSL_free(linebuf);
return values;

err:
OPENSSL_free(linebuf);
sk_CONF_VALUE_pop_free(values, X509V3_conf_free);
return NULL;

}

/* Delete leading and trailing spaces from a string */
static char *strip_spaces(char *name)
{
      char *p, *q;
      /* Skip over leading spaces */
      p = name;
      while(*p && isspace((unsigned char)*p)) p++;
      if(!*p) return NULL;
      q = p + strlen(p) - 1;
      while((q != p) && isspace((unsigned char)*q)) q--;
      if(p != q) q[1] = 0;
      if(!*p) return NULL;
      return p;
}

/* hex string utilities */

/* Given a buffer of length 'len' return a OPENSSL_malloc'ed string with its
 * hex representation
 * @@@ (Contents of buffer are always kept in ASCII, also on EBCDIC machines)
 */

char *hex_to_string(unsigned char *buffer, long len)
{
      char *tmp, *q;
      unsigned char *p;
      int i;
      const static char hexdig[] = "0123456789ABCDEF";
      if(!buffer || !len) return NULL;
      if(!(tmp = OPENSSL_malloc(len * 3 + 1))) {
            X509V3err(X509V3_F_HEX_TO_STRING,ERR_R_MALLOC_FAILURE);
            return NULL;
      }
      q = tmp;
      for(i = 0, p = buffer; i < len; i++,p++) {
            *q++ = hexdig[(*p >> 4) & 0xf];
            *q++ = hexdig[*p & 0xf];
            *q++ = ':';
      }
      q[-1] = 0;
#ifdef CHARSET_EBCDIC
      ebcdic2ascii(tmp, tmp, q - tmp - 1);
#endif

      return tmp;
}

/* Give a string of hex digits convert to
 * a buffer
 */

unsigned char *string_to_hex(char *str, long *len)
{
      unsigned char *hexbuf, *q;
      unsigned char ch, cl, *p;
      if(!str) {
            X509V3err(X509V3_F_STRING_TO_HEX,X509V3_R_INVALID_NULL_ARGUMENT);
            return NULL;
      }
      if(!(hexbuf = OPENSSL_malloc(strlen(str) >> 1))) goto err;
      for(p = (unsigned char *)str, q = hexbuf; *p;) {
            ch = *p++;
#ifdef CHARSET_EBCDIC
            ch = os_toebcdic[ch];
#endif
            if(ch == ':') continue;
            cl = *p++;
#ifdef CHARSET_EBCDIC
            cl = os_toebcdic[cl];
#endif
            if(!cl) {
                  X509V3err(X509V3_F_STRING_TO_HEX,X509V3_R_ODD_NUMBER_OF_DIGITS);
                  OPENSSL_free(hexbuf);
                  return NULL;
            }
            if(isupper(ch)) ch = tolower(ch);
            if(isupper(cl)) cl = tolower(cl);

            if((ch >= '0') && (ch <= '9')) ch -= '0';
            else if ((ch >= 'a') && (ch <= 'f')) ch -= 'a' - 10;
            else goto badhex;

            if((cl >= '0') && (cl <= '9')) cl -= '0';
            else if ((cl >= 'a') && (cl <= 'f')) cl -= 'a' - 10;
            else goto badhex;

            *q++ = (ch << 4) | cl;
      }

      if(len) *len = q - hexbuf;

      return hexbuf;

      err:
      if(hexbuf) OPENSSL_free(hexbuf);
      X509V3err(X509V3_F_STRING_TO_HEX,ERR_R_MALLOC_FAILURE);
      return NULL;

      badhex:
      OPENSSL_free(hexbuf);
      X509V3err(X509V3_F_STRING_TO_HEX,X509V3_R_ILLEGAL_HEX_DIGIT);
      return NULL;

}

/* V2I name comparison function: returns zero if 'name' matches
 * cmp or cmp.*
 */

int name_cmp(const char *name, const char *cmp)
{
      int len, ret;
      char c;
      len = strlen(cmp);
      if((ret = strncmp(name, cmp, len))) return ret;
      c = name[len];
      if(!c || (c=='.')) return 0;
      return 1;
}

static int sk_strcmp(const char * const *a, const char * const *b)
{
      return strcmp(*a, *b);
}

STACK *X509_get1_email(X509 *x)
{
      GENERAL_NAMES *gens;
      STACK *ret;
      gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
      ret = get_email(X509_get_subject_name(x), gens);
      sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
      return ret;
}

STACK *X509_REQ_get1_email(X509_REQ *x)
{
      GENERAL_NAMES *gens;
      STACK_OF(X509_EXTENSION) *exts;
      STACK *ret;
      exts = X509_REQ_get_extensions(x);
      gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL);
      ret = get_email(X509_REQ_get_subject_name(x), gens);
      sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
      sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
      return ret;
}


static STACK *get_email(X509_NAME *name, GENERAL_NAMES *gens)
{
      STACK *ret = NULL;
      X509_NAME_ENTRY *ne;
      ASN1_IA5STRING *email;
      GENERAL_NAME *gen;
      int i;
      /* Now add any email address(es) to STACK */
      i = -1;
      /* First supplied X509_NAME */
      while((i = X509_NAME_get_index_by_NID(name,
                               NID_pkcs9_emailAddress, i)) >= 0) {
            ne = X509_NAME_get_entry(name, i);
            email = X509_NAME_ENTRY_get_data(ne);
            if(!append_ia5(&ret, email)) return NULL;
      }
      for(i = 0; i < sk_GENERAL_NAME_num(gens); i++)
      {
            gen = sk_GENERAL_NAME_value(gens, i);
            if(gen->type != GEN_EMAIL) continue;
            if(!append_ia5(&ret, gen->d.ia5)) return NULL;
      }
      return ret;
}

static void str_free(void *str)
{
      OPENSSL_free(str);
}

static int append_ia5(STACK **sk, ASN1_IA5STRING *email)
{
      char *emtmp;
      /* First some sanity checks */
      if(email->type != V_ASN1_IA5STRING) return 1;
      if(!email->data || !email->length) return 1;
      if(!*sk) *sk = sk_new(sk_strcmp);
      if(!*sk) return 0;
      /* Don't add duplicates */
      if(sk_find(*sk, (char *)email->data) != -1) return 1;
      emtmp = BUF_strdup((char *)email->data);
      if(!emtmp || !sk_push(*sk, emtmp)) {
            X509_email_free(*sk);
            *sk = NULL;
            return 0;
      }
      return 1;
}

void X509_email_free(STACK *sk)
{
      sk_pop_free(sk, str_free);
}

/* Convert IP addresses both IPv4 and IPv6 into an 
 * OCTET STRING compatible with RFC3280.
 */

ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc)
      {
      unsigned char ipout[16];
      ASN1_OCTET_STRING *ret;
      int iplen;

      /* If string contains a ':' assume IPv6 */

      iplen = a2i_ipadd(ipout, ipasc);

      if (!iplen)
            return NULL;

      ret = ASN1_OCTET_STRING_new();
      if (!ret)
            return NULL;
      if (!ASN1_OCTET_STRING_set(ret, ipout, iplen))
            {
            ASN1_OCTET_STRING_free(ret);
            return NULL;
            }
      return ret;
      }

ASN1_OCTET_STRING *a2i_IPADDRESS_NC(const char *ipasc)
      {
      ASN1_OCTET_STRING *ret = NULL;
      unsigned char ipout[32];
      char *iptmp = NULL, *p;
      int iplen1, iplen2;
      p = strchr(ipasc,'/');
      if (!p)
            return NULL;
      iptmp = BUF_strdup(ipasc);
      if (!iptmp)
            return NULL;
      p = iptmp + (p - ipasc);
      *p++ = 0;

      iplen1 = a2i_ipadd(ipout, iptmp);

      if (!iplen1)
            goto err;

      iplen2 = a2i_ipadd(ipout + iplen1, p);

      OPENSSL_free(iptmp);
      iptmp = NULL;

      if (!iplen2 || (iplen1 != iplen2))
            goto err;

      ret = ASN1_OCTET_STRING_new();
      if (!ret)
            goto err;
      if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))
            goto err;

      return ret;

      err:
      if (iptmp)
            OPENSSL_free(iptmp);
      if (ret)
            ASN1_OCTET_STRING_free(ret);
      return NULL;
      }
      

int a2i_ipadd(unsigned char *ipout, const char *ipasc)
      {
      /* If string contains a ':' assume IPv6 */

      if (strchr(ipasc, ':'))
            {
            if (!ipv6_from_asc(ipout, ipasc))
                  return 0;
            return 16;
            }
      else
            {
            if (!ipv4_from_asc(ipout, ipasc))
                  return 0;
            return 4;
            }
      }

static int ipv4_from_asc(unsigned char *v4, const char *in)
      {
      int a0, a1, a2, a3;
      if (sscanf(in, "%d.%d.%d.%d", &a0, &a1, &a2, &a3) != 4)
            return 0;
      if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255)
            || (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))
            return 0;
      v4[0] = a0;
      v4[1] = a1;
      v4[2] = a2;
      v4[3] = a3;
      return 1;
      }

typedef struct {
            /* Temporary store for IPV6 output */
            unsigned char tmp[16];
            /* Total number of bytes in tmp */
            int total;
            /* The position of a zero (corresponding to '::') */
            int zero_pos;
            /* Number of zeroes */
            int zero_cnt;
      } IPV6_STAT;


static int ipv6_from_asc(unsigned char *v6, const char *in)
      {
      IPV6_STAT v6stat;
      v6stat.total = 0;
      v6stat.zero_pos = -1;
      v6stat.zero_cnt = 0;
      /* Treat the IPv6 representation as a list of values
       * separated by ':'. The presence of a '::' will parse
       * as one, two or three zero length elements.
       */
      if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))
            return 0;

      /* Now for some sanity checks */

      if (v6stat.zero_pos == -1)
            {
            /* If no '::' must have exactly 16 bytes */
            if (v6stat.total != 16)
                  return 0;
            }
      else 
            {
            /* If '::' must have less than 16 bytes */
            if (v6stat.total == 16)
                  return 0;
            /* More than three zeroes is an error */
            if (v6stat.zero_cnt > 3)
                  return 0;
            /* Can only have three zeroes if nothing else present */
            else if (v6stat.zero_cnt == 3)
                  {
                  if (v6stat.total > 0)
                        return 0;
                  }
            /* Can only have two zeroes if at start or end */
            else if (v6stat.zero_cnt == 2)
                  {
                  if ((v6stat.zero_pos != 0)
                        && (v6stat.zero_pos != v6stat.total))
                        return 0;
                  }
            else 
            /* Can only have one zero if *not* start or end */
                  {
                  if ((v6stat.zero_pos == 0)
                        || (v6stat.zero_pos == v6stat.total))
                        return 0;
                  }
            }

      /* Format result */

      /* Copy initial part */
      if (v6stat.zero_pos > 0)
            memcpy(v6, v6stat.tmp, v6stat.zero_pos);
      /* Zero middle */
      if (v6stat.total != 16)
            memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);
      /* Copy final part */
      if (v6stat.total != v6stat.zero_pos)
            memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,
                  v6stat.tmp + v6stat.zero_pos,
                  v6stat.total - v6stat.zero_pos);

      return 1;
      }

static int ipv6_cb(const char *elem, int len, void *usr)
      {
      IPV6_STAT *s = usr;
      /* Error if 16 bytes written */
      if (s->total == 16)
            return 0;
      if (len == 0)
            {
            /* Zero length element, corresponds to '::' */
            if (s->zero_pos == -1)
                  s->zero_pos = s->total;
            /* If we've already got a :: its an error */
            else if (s->zero_pos != s->total)
                  return 0;
            s->zero_cnt++;
            }
      else 
            {
            /* If more than 4 characters could be final a.b.c.d form */
            if (len > 4)
                  {
                  /* Need at least 4 bytes left */
                  if (s->total > 12)
                        return 0;
                  /* Must be end of string */
                  if (elem[len])
                        return 0;
                  if (!ipv4_from_asc(s->tmp + s->total, elem))
                        return 0;
                  s->total += 4;
                  }
            else
                  {
                  if (!ipv6_hex(s->tmp + s->total, elem, len))
                        return 0;
                  s->total += 2;
                  }
            }
      return 1;
      }

/* Convert a string of up to 4 hex digits into the corresponding
 * IPv6 form.
 */

static int ipv6_hex(unsigned char *out, const char *in, int inlen)
      {
      unsigned char c;
      unsigned int num = 0;
      if (inlen > 4)
            return 0;
      while(inlen--)
            {
            c = *in++;
            num <<= 4;
            if ((c >= '0') && (c <= '9'))
                  num |= c - '0';
            else if ((c >= 'A') && (c <= 'F'))
                  num |= c - 'A' + 10;
            else if ((c >= 'a') && (c <= 'f'))
                  num |=  c - 'a' + 10;
            else
                  return 0;
            }
      out[0] = num >> 8;
      out[1] = num & 0xff;
      return 1;
      }


int X509V3_NAME_from_section(X509_NAME *nm, STACK_OF(CONF_VALUE)*dn_sk,
                                    unsigned long chtype)
      {
      CONF_VALUE *v;
      int i, mval;
      char *p, *type;
      if (!nm)
            return 0;

      for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++)
            {
            v=sk_CONF_VALUE_value(dn_sk,i);
            type=v->name;
            /* Skip past any leading X. X: X, etc to allow for
             * multiple instances 
             */
            for(p = type; *p ; p++) 
#ifndef CHARSET_EBCDIC
                  if ((*p == ':') || (*p == ',') || (*p == '.'))
#else
                  if ((*p == os_toascii[':']) || (*p == os_toascii[',']) || (*p == os_toascii['.']))
#endif
                        {
                        p++;
                        if(*p) type = p;
                        break;
                        }
#ifndef CHARSET_EBCDIC
            if (*type == '+')
#else
            if (*type == os_toascii['+'])
#endif
                  {
                  mval = -1;
                  type++;
                  }
            else
                  mval = 0;
            if (!X509_NAME_add_entry_by_txt(nm,type, chtype,
                        (unsigned char *) v->value,-1,-1,mval))
                              return 0;

            }
      return 1;
      }

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