/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 *

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 *

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 *

 * 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 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 acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 *

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS 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 AUTHOR OR 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.

 *

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.] */

#include <openssl/conf.h>

#include <string.h>

#include <ctype.h>

#include <openssl/bio.h>

#include <openssl/buf.h>

#include <openssl/err.h>

#include <openssl/lhash.h>

#include <openssl/mem.h>

#include "conf_def.h"

#include "internal.h"

#include "../internal.h"

static const char kDefaultSectionName[] = "default";

static uint32_t conf_value_hash(const CONF_VALUE *v) {

  const uint32_t section_hash = v->section ? OPENSSL_strhash(v->section) : 0;

  const uint32_t name_hash = v->name ? OPENSSL_strhash(v->name) : 0;

  return (section_hash << 2) ^ name_hash;

}

static int conf_value_cmp(const CONF_VALUE *a, const CONF_VALUE *b) {

  int i;

  if (a->section != b->section) {

    i = strcmp(a->section, b->section);

    if (i) {

      return i;

    }

  }

  if (a->name != NULL && b->name != NULL) {

    return strcmp(a->name, b->name);

  } else if (a->name == b->name) {

    return 0;

  } else {

    return (a->name == NULL) ? -1 : 1;

  }

}

CONF *NCONF_new(void *method) {

  CONF *conf;

  if (method != NULL) {

    return NULL;

  }

  conf = OPENSSL_malloc(sizeof(CONF));

  if (conf == NULL) {

    return NULL;

  }

  conf->data = lh_CONF_VALUE_new(conf_value_hash, conf_value_cmp);

  if (conf->data == NULL) {

    OPENSSL_free(conf);

    return NULL;

  }

  return conf;

}

CONF_VALUE *CONF_VALUE_new(void) {

  CONF_VALUE *v = OPENSSL_malloc(sizeof(CONF_VALUE));

  if (!v) {

    return NULL;

  }

  OPENSSL_memset(v, 0, sizeof(CONF_VALUE));

  return v;

}

static void value_free_contents(CONF_VALUE *value) {

  OPENSSL_free(value->section);

  if (value->name) {

    OPENSSL_free(value->name);

    OPENSSL_free(value->value);

  } else {

    // TODO(davidben): When |value->name| is NULL, |CONF_VALUE| is actually an

    // entirely different structure. This is fragile and confusing. Make a

    // proper |CONF_SECTION| type that doesn't require this.

    sk_CONF_VALUE_free((STACK_OF(CONF_VALUE) *)value->value);

  }

}

static void value_free(CONF_VALUE *value) {

  if (value != NULL) {

    value_free_contents(value);

    OPENSSL_free(value);

  }

}

static void value_free_arg(CONF_VALUE *value, void *arg) { value_free(value); }

void NCONF_free(CONF *conf) {

  if (conf == NULL || conf->data == NULL) {

    return;

  }

  lh_CONF_VALUE_doall_arg(conf->data, value_free_arg, NULL);

  lh_CONF_VALUE_free(conf->data);

  OPENSSL_free(conf);

}

static CONF_VALUE *NCONF_new_section(const CONF *conf, const char *section) {

  STACK_OF(CONF_VALUE) *sk = NULL;

  int ok = 0;

  CONF_VALUE *v = NULL, *old_value;

  sk = sk_CONF_VALUE_new_null();

  v = CONF_VALUE_new();

  if (sk == NULL || v == NULL) {

    goto err;

  }

  v->section = OPENSSL_strdup(section);

  if (v->section == NULL) {

    goto err;

  }

  v->name = NULL;

  v->value = (char *)sk;

  if (!lh_CONF_VALUE_insert(conf->data, &old_value, v)) {

    goto err;

  }

  value_free(old_value);

  ok = 1;

err:

  if (!ok) {

    sk_CONF_VALUE_free(sk);

    OPENSSL_free(v);

    v = NULL;

  }

  return v;

}

static int str_copy(CONF *conf, char *section, char **pto, char *from) {

  int q, to = 0, len = 0;

  char v;

  BUF_MEM *buf;

  buf = BUF_MEM_new();

  if (buf == NULL) {

    return 0;

  }

  len = strlen(from) + 1;

  if (!BUF_MEM_grow(buf, len)) {

    goto err;

  }

  for (;;) {

    if (IS_QUOTE(conf, *from)) {

      q = *from;

      from++;

      while (!IS_EOF(conf, *from) && (*from != q)) {

        if (IS_ESC(conf, *from)) {

          from++;

          if (IS_EOF(conf, *from)) {

            break;

          }

        }

        buf->data[to++] = *(from++);

      }

      if (*from == q) {

        from++;

      }

    } else if (IS_ESC(conf, *from)) {

      from++;

      v = *(from++);

      if (IS_EOF(conf, v)) {

        break;

      } else if (v == 'r') {

        v = '\r';

      } else if (v == 'n') {

        v = '\n';

      } else if (v == 'b') {

        v = '\b';

      } else if (v == 't') {

        v = '\t';

      }

      buf->data[to++] = v;

    } else if (IS_EOF(conf, *from)) {

      break;

    } else if (*from == '$') {

      // Historically, $foo would expand to a previously-parsed value. This

      // feature has been removed as it was unused and is a DoS vector.

      OPENSSL_PUT_ERROR(CONF, CONF_R_VARIABLE_EXPANSION_NOT_SUPPORTED);

      goto err;

    } else {

      buf->data[to++] = *(from++);

    }

  }

  buf->data[to] = '\0';

  OPENSSL_free(*pto);

  *pto = buf->data;

  OPENSSL_free(buf);

  return 1;

err:

  BUF_MEM_free(buf);

  return 0;

}

static CONF_VALUE *get_section(const CONF *conf, const char *section) {

  CONF_VALUE template;

  OPENSSL_memset(&template, 0, sizeof(template));

  template.section = (char *) section;

  return lh_CONF_VALUE_retrieve(conf->data, &template);

}

const STACK_OF(CONF_VALUE) *NCONF_get_section(const CONF *conf,

                                              const char *section) {

  const CONF_VALUE *section_value = get_section(conf, section);

  if (section_value == NULL) {

    return NULL;

  }

  return (STACK_OF(CONF_VALUE)*) section_value->value;

}

const char *NCONF_get_string(const CONF *conf, const char *section,

                             const char *name) {

  CONF_VALUE template, *value;

  if (section == NULL) {

    section = kDefaultSectionName;

  }

  OPENSSL_memset(&template, 0, sizeof(template));

  template.section = (char *) section;

  template.name = (char *) name;

  value = lh_CONF_VALUE_retrieve(conf->data, &template);

  if (value == NULL) {

    return NULL;

  }

  return value->value;

}

static int add_string(const CONF *conf, CONF_VALUE *section,

                      CONF_VALUE *value) {

  STACK_OF(CONF_VALUE) *section_stack = (STACK_OF(CONF_VALUE)*) section->value;

  CONF_VALUE *old_value;

  value->section = OPENSSL_strdup(section->section);

  if (!sk_CONF_VALUE_push(section_stack, value)) {

    return 0;

  }

  if (!lh_CONF_VALUE_insert(conf->data, &old_value, value)) {

    return 0;

  }

  if (old_value != NULL) {

    (void)sk_CONF_VALUE_delete_ptr(section_stack, old_value);

    value_free(old_value);

  }

  return 1;

}

static char *eat_ws(CONF *conf, char *p) {

  while (IS_WS(conf, *p) && !IS_EOF(conf, *p)) {

    p++;

  }

  return p;

}

#define scan_esc(conf, p) (((IS_EOF((conf), (p)[1])) ? ((p) + 1) : ((p) + 2)))

static char *eat_alpha_numeric(CONF *conf, char *p) {

  for (;;) {

    if (IS_ESC(conf, *p)) {

      p = scan_esc(conf, p);

      continue;

    }

    if (!IS_ALPHA_NUMERIC_PUNCT(conf, *p)) {

      return p;

    }

    p++;

  }

}

static char *scan_quote(CONF *conf, char *p) {

  int q = *p;

  p++;

  while (!IS_EOF(conf, *p) && *p != q) {

    if (IS_ESC(conf, *p)) {

      p++;

      if (IS_EOF(conf, *p)) {

        return p;

      }

    }

    p++;

  }

  if (*p == q) {

    p++;

  }

  return p;

}

static void clear_comments(CONF *conf, char *p) {

  for (;;) {

    if (!IS_WS(conf, *p)) {

      break;

    }

    p++;

  }

  for (;;) {

    if (IS_COMMENT(conf, *p)) {

      *p = '\0';

      return;

    }

    if (IS_QUOTE(conf, *p)) {

      p = scan_quote(conf, p);

      continue;

    }

    if (IS_ESC(conf, *p)) {

      p = scan_esc(conf, p);

      continue;

    }

    if (IS_EOF(conf, *p)) {

      return;

    } else {

      p++;

    }

  }

}

static int def_load_bio(CONF *conf, BIO *in, long *out_error_line) {

  static const size_t CONFBUFSIZE = 512;

  int bufnum = 0, i, ii;

  BUF_MEM *buff = NULL;

  char *s, *p, *end;

  int again;

  long eline = 0;

  char btmp[DECIMAL_SIZE(eline) + 1];

  CONF_VALUE *v = NULL, *tv;

  CONF_VALUE *sv = NULL;

  char *section = NULL, *buf;

  char *start, *psection, *pname;

  if ((buff = BUF_MEM_new()) == NULL) {

    OPENSSL_PUT_ERROR(CONF, ERR_R_BUF_LIB);

    goto err;

  }

  section = OPENSSL_strdup(kDefaultSectionName);

  if (section == NULL) {

    goto err;

  }

  sv = NCONF_new_section(conf, section);

  if (sv == NULL) {

    OPENSSL_PUT_ERROR(CONF, CONF_R_UNABLE_TO_CREATE_NEW_SECTION);

    goto err;

  }

  bufnum = 0;

  again = 0;

  for (;;) {

    if (!BUF_MEM_grow(buff, bufnum + CONFBUFSIZE)) {

      OPENSSL_PUT_ERROR(CONF, ERR_R_BUF_LIB);

      goto err;

    }

    p = &(buff->data[bufnum]);

    *p = '\0';

    BIO_gets(in, p, CONFBUFSIZE - 1);

    p[CONFBUFSIZE - 1] = '\0';

    ii = i = strlen(p);

    if (i == 0 && !again) {

      break;

    }

    again = 0;

    while (i > 0) {

      if ((p[i - 1] != '\r') && (p[i - 1] != '\n')) {

        break;

      } else {

        i--;

      }

    }

    // we removed some trailing stuff so there is a new

    // line on the end.

    if (ii && i == ii) {

      again = 1;  // long line

    } else {

      p[i] = '\0';

      eline++;  // another input line

    }

    // we now have a line with trailing \r\n removed

    // i is the number of bytes

    bufnum += i;

    v = NULL;

    // check for line continuation

    if (bufnum >= 1) {

      // If we have bytes and the last char '\\' and

      // second last char is not '\\'

      p = &(buff->data[bufnum - 1]);

      if (IS_ESC(conf, p[0]) && ((bufnum <= 1) || !IS_ESC(conf, p[-1]))) {

        bufnum--;

        again = 1;

      }

    }

    if (again) {

      continue;

    }

    bufnum = 0;

    buf = buff->data;

    clear_comments(conf, buf);

    s = eat_ws(conf, buf);

    if (IS_EOF(conf, *s)) {

      continue;  // blank line

    }

    if (*s == '[') {

      char *ss;

      s++;

      start = eat_ws(conf, s);

      ss = start;

    again:

      end = eat_alpha_numeric(conf, ss);

      p = eat_ws(conf, end);

      if (*p != ']') {

        if (*p != '\0' && ss != p) {

          ss = p;

          goto again;

        }

        OPENSSL_PUT_ERROR(CONF, CONF_R_MISSING_CLOSE_SQUARE_BRACKET);

        goto err;

      }

      *end = '\0';

      if (!str_copy(conf, NULL, &section, start)) {

        goto err;

      }

      if ((sv = get_section(conf, section)) == NULL) {

        sv = NCONF_new_section(conf, section);

      }

      if (sv == NULL) {

        OPENSSL_PUT_ERROR(CONF, CONF_R_UNABLE_TO_CREATE_NEW_SECTION);

        goto err;

      }

      continue;

    } else {

      pname = s;

      psection = NULL;

      end = eat_alpha_numeric(conf, s);

      if ((end[0] == ':') && (end[1] == ':')) {

        *end = '\0';

        end += 2;

        psection = pname;

        pname = end;

        end = eat_alpha_numeric(conf, end);

      }

      p = eat_ws(conf, end);

      if (*p != '=') {

        OPENSSL_PUT_ERROR(CONF, CONF_R_MISSING_EQUAL_SIGN);

        goto err;

      }

      *end = '\0';

      p++;

      start = eat_ws(conf, p);

      while (!IS_EOF(conf, *p)) {

        p++;

      }

      p--;

      while ((p != start) && (IS_WS(conf, *p))) {

        p--;

      }

      p++;

      *p = '\0';

      if (!(v = CONF_VALUE_new())) {

        goto err;

      }

      if (psection == NULL) {

        psection = section;

      }

      v->name = OPENSSL_strdup(pname);

      if (v->name == NULL) {

        goto err;

      }

      if (!str_copy(conf, psection, &(v->value), start)) {

        goto err;

      }

      if (strcmp(psection, section) != 0) {

        if ((tv = get_section(conf, psection)) == NULL) {

          tv = NCONF_new_section(conf, psection);

        }

        if (tv == NULL) {

          OPENSSL_PUT_ERROR(CONF, CONF_R_UNABLE_TO_CREATE_NEW_SECTION);

          goto err;

        }

      } else {

        tv = sv;

      }

      if (add_string(conf, tv, v) == 0) {

        goto err;

      }

      v = NULL;

    }

  }

  BUF_MEM_free(buff);

  OPENSSL_free(section);

  return 1;

err:

  BUF_MEM_free(buff);

  OPENSSL_free(section);

  if (out_error_line != NULL) {

    *out_error_line = eline;

  }

  BIO_snprintf(btmp, sizeof btmp, "%ld", eline);

  ERR_add_error_data(2, "line ", btmp);

  if (v != NULL) {

    OPENSSL_free(v->name);

    OPENSSL_free(v->value);

    OPENSSL_free(v);

  }

  return 0;

}

int NCONF_load(CONF *conf, const char *filename, long *out_error_line) {

  BIO *in = BIO_new_file(filename, "rb");

  int ret;

  if (in == NULL) {

    OPENSSL_PUT_ERROR(CONF, ERR_R_SYS_LIB);

    return 0;

  }

  ret = def_load_bio(conf, in, out_error_line);

  BIO_free(in);

  return ret;

}

int NCONF_load_bio(CONF *conf, BIO *bio, long *out_error_line) {

  return def_load_bio(conf, bio, out_error_line);

}

int CONF_parse_list(const char *list, char sep, int remove_whitespace,

                    int (*list_cb)(const char *elem, size_t len, void *usr),

                    void *arg) {

  int ret;

  const char *lstart, *tmpend, *p;

  if (list == NULL) {

    OPENSSL_PUT_ERROR(CONF, CONF_R_LIST_CANNOT_BE_NULL);

    return 0;

  }

  lstart = list;

  for (;;) {

    if (remove_whitespace) {

      while (*lstart && OPENSSL_isspace((unsigned char)*lstart)) {

        lstart++;

      }

    }

    p = strchr(lstart, sep);

    if (p == lstart || !*lstart) {

      ret = list_cb(NULL, 0, arg);

    } else {

      if (p) {

        tmpend = p - 1;

      } else {

        tmpend = lstart + strlen(lstart) - 1;

      }

      if (remove_whitespace) {

        while (OPENSSL_isspace((unsigned char)*tmpend)) {

          tmpend--;

        }

      }

      ret = list_cb(lstart, tmpend - lstart + 1, arg);

    }

    if (ret <= 0) {

      return ret;

    }

    if (p == NULL) {

      return 1;

    }

    lstart = p + 1;

  }

}

int CONF_modules_load_file(const char *filename, const char *appname,

                           unsigned long flags) {

  return 1;

}

void CONF_modules_free(void) {}

void OPENSSL_config(const char *config_name) {}

void OPENSSL_no_config(void) {}