/* crypto/conf/conf.c */

/* 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.]

 */

/* Part of the code in here was originally in conf.c, which is now removed */

#include <stdio.h>

#include <string.h>

#include "cryptlib.h"

#include <openssl/stack.h>

#include <openssl/lhash.h>

#include <openssl/conf.h>

#include <openssl/conf_api.h>

#include "conf_def.h"

#include <openssl/buffer.h>

#include <openssl/err.h>

/*

 * The maximum length we can grow a value to after variable expansion. 64k

 * should be more than enough for all reasonable uses.

 */

#define MAX_CONF_VALUE_LENGTH       65536

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

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

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

static int str_copy(CONF *conf, char *section, char **to, char *from);

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

static char *scan_dquote(CONF *conf, char *p);

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

static CONF *def_create(CONF_METHOD *meth);

static int def_init_default(CONF *conf);

static int def_init_WIN32(CONF *conf);

static int def_destroy(CONF *conf);

static int def_destroy_data(CONF *conf);

static int def_load(CONF *conf, const char *name, long *eline);

static int def_load_bio(CONF *conf, BIO *bp, long *eline);

static int def_dump(const CONF *conf, BIO *bp);

static int def_is_number(const CONF *conf, char c);

static int def_to_int(const CONF *conf, char c);

const char CONF_def_version[] = "CONF_def" OPENSSL_VERSION_PTEXT;

static CONF_METHOD default_method = {

    "OpenSSL default",

    def_create,

    def_init_default,

    def_destroy,

    def_destroy_data,

    def_load_bio,

    def_dump,

    def_is_number,

    def_to_int,

    def_load

};

static CONF_METHOD WIN32_method = {

    "WIN32",

    def_create,

    def_init_WIN32,

    def_destroy,

    def_destroy_data,

    def_load_bio,

    def_dump,

    def_is_number,

    def_to_int,

    def_load

};

CONF_METHOD *NCONF_default()

{

    return &default_method;

}

CONF_METHOD *NCONF_WIN32()

{

    return &WIN32_method;

}

static CONF *def_create(CONF_METHOD *meth)

{

    CONF *ret;

    ret = OPENSSL_malloc(sizeof(CONF) + sizeof(unsigned short *));

    if (ret)

        if (meth->init(ret) == 0) {

            OPENSSL_free(ret);

            ret = NULL;

        }

    return ret;

}

static int def_init_default(CONF *conf)

{

    if (conf == NULL)

        return 0;

    conf->meth = &default_method;

    conf->meth_data = CONF_type_default;

    conf->data = NULL;

    return 1;

}

static int def_init_WIN32(CONF *conf)

{

    if (conf == NULL)

        return 0;

    conf->meth = &WIN32_method;

    conf->meth_data = (void *)CONF_type_win32;

    conf->data = NULL;

    return 1;

}

static int def_destroy(CONF *conf)

{

    if (def_destroy_data(conf)) {

        OPENSSL_free(conf);

        return 1;

    }

    return 0;

}

static int def_destroy_data(CONF *conf)

{

    if (conf == NULL)

        return 0;

    _CONF_free_data(conf);

    return 1;

}

static int def_load(CONF *conf, const char *name, long *line)

{

    int ret;

    BIO *in = NULL;

#ifdef OPENSSL_SYS_VMS

    in = BIO_new_file(name, "r");

#else

    in = BIO_new_file(name, "rb");

#endif

    if (in == NULL) {

        if (ERR_GET_REASON(ERR_peek_last_error()) == BIO_R_NO_SUCH_FILE)

            CONFerr(CONF_F_DEF_LOAD, CONF_R_NO_SUCH_FILE);

        else

            CONFerr(CONF_F_DEF_LOAD, ERR_R_SYS_LIB);

        return 0;

    }

    ret = def_load_bio(conf, in, line);

    BIO_free(in);

    return ret;

}

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

{

/* The macro BUFSIZE conflicts with a system macro in VxWorks */

#define 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;

    void *h = (void *)(conf->data);

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

        CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_BUF_LIB);

        goto err;

    }

    section = BUF_strdup("default");

    if (section == NULL) {

        CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);

        goto err;

    }

    if (_CONF_new_data(conf) == 0) {

        CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);

        goto err;

    }

    sv = _CONF_new_section(conf, section);

    if (sv == NULL) {

        CONFerr(CONF_F_DEF_LOAD_BIO, CONF_R_UNABLE_TO_CREATE_NEW_SECTION);

        goto err;

    }

    bufnum = 0;

    again = 0;

    for (;;) {

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

            CONFerr(CONF_F_DEF_LOAD_BIO, 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;

                }

                CONFerr(CONF_F_DEF_LOAD_BIO,

                        CONF_R_MISSING_CLOSE_SQUARE_BRACKET);

                goto err;

            }

            *end = '\0';

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

                goto err;

            if ((sv = _CONF_get_section(conf, section)) == NULL)

                sv = _CONF_new_section(conf, section);

            if (sv == NULL) {

                CONFerr(CONF_F_DEF_LOAD_BIO,

                        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 != '=') {

                CONFerr(CONF_F_DEF_LOAD_BIO, 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 *)OPENSSL_malloc(sizeof(CONF_VALUE)))) {

                CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);

                goto err;

            }

            if (psection == NULL)

                psection = section;

            v->name = (char *)OPENSSL_malloc(strlen(pname) + 1);

            v->value = NULL;

            if (v->name == NULL) {

                CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);

                goto err;

            }

            BUF_strlcpy(v->name, pname, strlen(pname) + 1);

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

                goto err;

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

                if ((tv = _CONF_get_section(conf, psection))

                    == NULL)

                    tv = _CONF_new_section(conf, psection);

                if (tv == NULL) {

                    CONFerr(CONF_F_DEF_LOAD_BIO,

                            CONF_R_UNABLE_TO_CREATE_NEW_SECTION);

                    goto err;

                }

            } else

                tv = sv;

#if 1

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

                CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);

                goto err;

            }

#else

            v->section = tv->section;

            if (!sk_CONF_VALUE_push(ts, v)) {

                CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);

                goto err;

            }

            vv = (CONF_VALUE *)lh_insert(conf->data, v);

            if (vv != NULL) {

                sk_CONF_VALUE_delete_ptr(ts, vv);

                OPENSSL_free(vv->name);

                OPENSSL_free(vv->value);

                OPENSSL_free(vv);

            }

#endif

            v = NULL;

        }

    }

    if (buff != NULL)

        BUF_MEM_free(buff);

    if (section != NULL)

        OPENSSL_free(section);

    return (1);

 err:

    if (buff != NULL)

        BUF_MEM_free(buff);

    if (section != NULL)

        OPENSSL_free(section);

    if (line != NULL)

        *line = eline;

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

    ERR_add_error_data(2, "line ", btmp);

    if ((h != conf->data) && (conf->data != NULL)) {

        CONF_free(conf->data);

        conf->data = NULL;

    }

    if (v != NULL) {

        if (v->name != NULL)

            OPENSSL_free(v->name);

        if (v->value != NULL)

            OPENSSL_free(v->value);

        if (v != NULL)

            OPENSSL_free(v);

    }

    return (0);

}

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

{

    for (;;) {

        if (IS_FCOMMENT(conf, *p)) {

            *p = '\0';

            return;

        }

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

            break;

        }

        p++;

    }

    for (;;) {

        if (IS_COMMENT(conf, *p)) {

            *p = '\0';

            return;

        }

        if (IS_DQUOTE(conf, *p)) {

            p = scan_dquote(conf, p);

            continue;

        }

        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 str_copy(CONF *conf, char *section, char **pto, char *from)

{

    int q, r, rr = 0, to = 0, len = 0;

    char *s, *e, *rp, *p, *rrp, *np, *cp, v;

    BUF_MEM *buf;

    if ((buf = BUF_MEM_new()) == 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_DQUOTE(conf, *from)) {

            q = *from;

            from++;

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

                if (*from == q) {

                    if (*(from + 1) == q) {

                        from++;

                    } else {

                        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 == '$') {

            size_t newsize;

            /* try to expand it */

            rrp = NULL;

            s = &(from[1]);

            if (*s == '{')

                q = '}';

            else if (*s == '(')

                q = ')';

            else

                q = 0;

            if (q)

                s++;

            cp = section;

            e = np = s;

            while (IS_ALPHA_NUMERIC(conf, *e))

                e++;

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

                cp = np;

                rrp = e;

                rr = *e;

                *rrp = '\0';

                e += 2;

                np = e;

                while (IS_ALPHA_NUMERIC(conf, *e))

                    e++;

            }

            r = *e;

            *e = '\0';

            rp = e;

            if (q) {

                if (r != q) {

                    CONFerr(CONF_F_STR_COPY, CONF_R_NO_CLOSE_BRACE);

                    goto err;

                }

                e++;

            }

            /*-

             * So at this point we have

             * np which is the start of the name string which is

             *   '\0' terminated.

             * cp which is the start of the section string which is

             *   '\0' terminated.

             * e is the 'next point after'.

             * r and rr are the chars replaced by the '\0'

             * rp and rrp is where 'r' and 'rr' came from.

             */

            p = _CONF_get_string(conf, cp, np);

            if (rrp != NULL)

                *rrp = rr;

            *rp = r;

            if (p == NULL) {

                CONFerr(CONF_F_STR_COPY, CONF_R_VARIABLE_HAS_NO_VALUE);

                goto err;

            }

            newsize = strlen(p) + buf->length - (e - from);

            if (newsize > MAX_CONF_VALUE_LENGTH) {

                CONFerr(CONF_F_STR_COPY, CONF_R_VARIABLE_EXPANSION_TOO_LONG);

                goto err;

            }

            if (!BUF_MEM_grow_clean(buf, newsize)) {

                CONFerr(CONF_F_STR_COPY, ERR_R_MALLOC_FAILURE);

                goto err;

            }

            while (*p)

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

            /*

             * Since we change the pointer 'from', we also have to change the

             * perceived length of the string it points at.  /RL

             */

            len -= e - from;

            from = e;

            /*

             * In case there were no braces or parenthesis around the

             * variable reference, we have to put back the character that was

             * replaced with a '\0'.  /RL

             */

            *rp = r;

        } else

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

    }

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

    if (*pto != NULL)

        OPENSSL_free(*pto);

    *pto = buf->data;

    OPENSSL_free(buf);

    return (1);

 err:

    if (buf != NULL)

        BUF_MEM_free(buf);

    return (0);

}

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

{

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

        p++;

    return (p);

}

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 char *scan_dquote(CONF *conf, char *p)

{

    int q = *p;

    p++;

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

        if (*p == q) {

            if (*(p + 1) == q) {

                p++;

            } else {

                break;

            }

        }

        p++;

    }

    if (*p == q)

        p++;

    return (p);

}

static void dump_value_doall_arg(CONF_VALUE *a, BIO *out)

{

    if (a->name)

        BIO_printf(out, "[%s] %s=%s\n", a->section, a->name, a->value);

    else

        BIO_printf(out, "[[%s]]\n", a->section);

}

static IMPLEMENT_LHASH_DOALL_ARG_FN(dump_value, CONF_VALUE, BIO)

static int def_dump(const CONF *conf, BIO *out)

{

    lh_CONF_VALUE_doall_arg(conf->data, LHASH_DOALL_ARG_FN(dump_value),

                            BIO, out);

    return 1;

}

static int def_is_number(const CONF *conf, char c)

{

    return IS_NUMBER(conf, c);

}

static int def_to_int(const CONF *conf, char c)

{

    return c - '0';

}