conf.c

openssl是ssl的开源项目

/* crypto/conf/conf.c */
/* Copyright (C) 1995-1998 Eric Young ([e-mail])
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young ([e-mail]).
 * 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 ([e-mail]).
 * 
 * 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 ([e-mail])"
 *    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 ([e-mail])"
 * 
 * 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 <stdio.h>
#include <errno.h>
#include "cryptlib.h"
#include "stack.h"
#include "lhash.h"
#include "conf.h"
#include "buffer.h"
#include "err.h"

#include "conf_lcl.h"

#ifndef NOPROTO
static void value_free_hash(CONF_VALUE *a, LHASH *conf);
static void value_free_stack(CONF_VALUE *a,LHASH *conf);
static unsigned long hash(CONF_VALUE *v);
static int cmp(CONF_VALUE *a,CONF_VALUE *b);
static char *eat_ws(char *p);
static char *eat_alpha_numeric(char *p);
static void clear_comments(char *p);
static int str_copy(LHASH *conf,char *section,char **to, char *from);
static char *scan_quote(char *p);
static CONF_VALUE *new_section(LHASH *conf,char *section);
static CONF_VALUE *get_section(LHASH *conf,char *section);
#else
static void value_free_hash();
static void value_free_stack();
static unsigned long hash();
static int cmp();
static char *eat_ws();
static char *eat_alpha_numeric();
static void clear_comments();
static int str_copy();
static char *scan_quote();
static CONF_VALUE *new_section();
static CONF_VALUE *get_section();
#endif

#define scan_esc(p)	((((p)[1] == '\0')?(p++):(p+=2)),p)

char *CONF_version="CONF part of OpenSSL 0.9.1c 23-Dec-1998";

LHASH *CONF_load(h,file,line)
LHASH *h;
char *file;
long *line;
	{
	LHASH *ret=NULL;
	FILE *in=NULL;
#define BUFSIZE	512
	char btmp[16];
	int bufnum=0,i,ii;
	BUF_MEM *buff=NULL;
	char *s,*p,*end;
	int again,n;
	long eline=0;
	CONF_VALUE *v=NULL,*vv,*tv;
	CONF_VALUE *sv=NULL;
	char *section=NULL,*buf;
	STACK *section_sk=NULL,*ts;
	char *start,*psection,*pname;

	if ((buff=BUF_MEM_new()) == NULL)
		{
		CONFerr(CONF_F_CONF_LOAD,ERR_R_BUF_LIB);
		goto err;
		}

	in=fopen(file,"rb");
	if (in == NULL)
		{
		SYSerr(SYS_F_FOPEN,get_last_sys_error());
		ERR_set_error_data(BUF_strdup(file),
			ERR_TXT_MALLOCED|ERR_TXT_STRING);
		CONFerr(CONF_F_CONF_LOAD,ERR_R_SYS_LIB);
		goto err;
		}

	section=(char *)Malloc(10);
	if (section == NULL)
		{
		CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
		goto err;
		}
	strcpy(section,"default");

	if (h == NULL)
		{
		if ((ret=lh_new(hash,cmp)) == NULL)
			{
			CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
			goto err;
			}
		}
	else
		ret=h;

	sv=new_section(ret,section);
	if (sv == NULL)
		{
		CONFerr(CONF_F_CONF_LOAD,CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
		goto err;
		}
	section_sk=(STACK *)sv->value;

	bufnum=0;
	for (;;)
		{
		again=0;
		if (!BUF_MEM_grow(buff,bufnum+BUFSIZE))
			{
			CONFerr(CONF_F_CONF_LOAD,ERR_R_BUF_LIB);
			goto err;
			}
		p= &(buff->data[bufnum]);
		*p='\0';
		fgets(p,BUFSIZE-1,in);
		p[BUFSIZE-1]='\0';
		ii=i=strlen(p);
		if (i == 0) break;
		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 (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(p[0]) &&
				((bufnum <= 1) || !IS_ESC(p[-1])))
				{
				bufnum--;
				again=1;
				}
			}
		if (again) continue;
		bufnum=0;
		buf=buff->data;

		clear_comments(buf);
		n=strlen(buf);
		s=eat_ws(buf);
		if (IS_EOF(*s)) continue; /* blank line */
		if (*s == '[')
			{
			char *ss;

			s++;
			start=eat_ws(s);
			ss=start;
again:
			end=eat_alpha_numeric(ss);
			p=eat_ws(end);
			if (*p != ']')
				{
				if (*p != '\0')
					{
					ss=p;
					goto again;
					}
				CONFerr(CONF_F_CONF_LOAD,CONF_R_MISSING_CLOSE_SQUARE_BRACKET);
				goto err;
				}
			*end='\0';
			if (!str_copy(ret,NULL,&section,start)) goto err;
			if ((sv=get_section(ret,section)) == NULL)
				sv=new_section(ret,section);
			if (sv == NULL)
				{
				CONFerr(CONF_F_CONF_LOAD,CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
				goto err;
				}
			section_sk=(STACK *)sv->value;
			continue;
			}
		else
			{
			pname=s;
			psection=NULL;
			end=eat_alpha_numeric(s);
			if ((end[0] == ':') && (end[1] == ':'))
				{
				*end='\0';
				end+=2;
				psection=pname;
				pname=end;
				end=eat_alpha_numeric(end);
				}
			p=eat_ws(end);
			if (*p != '=')
				{
				CONFerr(CONF_F_CONF_LOAD,CONF_R_MISSING_EQUAL_SIGN);
				goto err;
				}
			*end='\0';
			p++;
			start=eat_ws(p);
			while (!IS_EOF(*p))
				p++;
			p--;
			while ((p != start) && (IS_WS(*p)))
				p--;
			p++;
			*p='\0';

			if ((v=(CONF_VALUE *)Malloc(sizeof(CONF_VALUE))) == NULL)
				{
				CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
				goto err;
				}
			if (psection == NULL) psection=section;
			v->name=(char *)Malloc(strlen(pname)+1);
			v->value=NULL;
			if (v->name == NULL)
				{
				CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
				goto err;
				}
			strcpy(v->name,pname);
			if (!str_copy(ret,psection,&(v->value),start)) goto err;

			if (strcmp(psection,section) != 0)
				{
				if ((tv=get_section(ret,psection))
					== NULL)
					tv=new_section(ret,psection);
				if (tv == NULL)
					{
					CONFerr(CONF_F_CONF_LOAD,CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
					goto err;
					}
				ts=(STACK *)tv->value;
				}
			else
				{
				tv=sv;
				ts=section_sk;
				}
			v->section=tv->section;	
			if (!sk_push(ts,(char *)v))
				{
				CONFerr(CONF_F_CONF_LOAD,ERR_R_MALLOC_FAILURE);
				goto err;
				}
			vv=(CONF_VALUE *)lh_insert(ret,(char *)v);
			if (vv != NULL)
				{
				sk_delete_ptr(ts,(char *)vv);
				Free(vv->name);
				Free(vv->value);
				Free(vv);
				}
			v=NULL;
			}
		}
	if (buff != NULL) BUF_MEM_free(buff);
	if (section != NULL) Free(section);
	if (in != NULL) fclose(in);
	return(ret);
err:
	if (buff != NULL) BUF_MEM_free(buff);
	if (section != NULL) Free(section);
	if (line != NULL) *line=eline;
	sprintf(btmp,"%ld",eline);
	ERR_add_error_data(2,"line ",btmp);
	if (in != NULL) fclose(in);
	if ((h != ret) && (ret != NULL)) CONF_free(ret);
	if (v != NULL)
		{
		if (v->name != NULL) Free(v->name);
		if (v->value != NULL) Free(v->value);
		if (v != NULL) Free(v);
		}
	return(NULL);
	}
		
char *CONF_get_string(conf,section,name)
LHASH *conf;
char *section;
char *name;
	{
	CONF_VALUE *v,vv;
	char *p;

	if (name == NULL) return(NULL);
	if (conf != NULL)
		{
		if (section != NULL)
			{
			vv.name=name;
			vv.section=section;
			v=(CONF_VALUE *)lh_retrieve(conf,(char *)&vv);
			if (v != NULL) return(v->value);