err.c

来自「一个用于点对点传输加密的工具包源码」· C语言 代码 · 共 794 行 · 第 1/2 页

		es->err_buffer[i]=0;
		es->err_file[i]=NULL;
		es->err_line[i]= -1;
		err_clear_data(es,i);
		}
#endif
	es->top=es->bottom=0;
	}


unsigned long ERR_get_error(void)
	{ return(get_error_values(1,NULL,NULL,NULL,NULL)); }

unsigned long ERR_get_error_line(const char **file,
	     int *line)
	{ return(get_error_values(1,file,line,NULL,NULL)); }

unsigned long ERR_get_error_line_data(const char **file, int *line,
	     const char **data, int *flags)
	{ return(get_error_values(1,file,line,
	     data,flags)); }

unsigned long ERR_peek_error(void)
	{ return(get_error_values(0,NULL,NULL,NULL,NULL)); }

unsigned long ERR_peek_error_line(const char **file,
	     int *line)
	{ return(get_error_values(0,file,line,NULL,NULL)); }

unsigned long ERR_peek_error_line_data(const char **file, int *line,
	     const char **data, int *flags)
	{ return(get_error_values(0,file,line,
	     data,flags)); }

static unsigned long get_error_values(int inc, const char **file, int *line,
	     const char **data, int *flags)
	{	
	int i=0;
	ERR_STATE *es;
	unsigned long ret;

	es=ERR_get_state();

	if (es->bottom == es->top) return(0);
	i=(es->bottom+1)%ERR_NUM_ERRORS;

	ret=es->err_buffer[i];
	if (inc)
		{
		es->bottom=i;
		es->err_buffer[i]=0;
		}

	if ((file != NULL) && (line != NULL))
		{
		if (es->err_file[i] == NULL)
			{
			*file="NA";
			if (line != NULL) *line=0;
			}
		else
			{
			*file=es->err_file[i];
			if (line != NULL) *line=es->err_line[i];
			}
		}

	if (data != NULL)
		{
		if (es->err_data[i] == NULL)
			{
			*data="";
			if (flags != NULL) *flags=0;
			}
		else
			{
			*data=es->err_data[i];
			if (flags != NULL) *flags=es->err_data_flags[i];
			}
		}
	return(ret);
	}

void ERR_error_string_n(unsigned long e, char *buf, size_t len)
	{
	char lsbuf[64], fsbuf[64], rsbuf[64];
	const char *ls,*fs,*rs;
	unsigned long l,f,r;

	l=ERR_GET_LIB(e);
	f=ERR_GET_FUNC(e);
	r=ERR_GET_REASON(e);

	ls=ERR_lib_error_string(e);
	fs=ERR_func_error_string(e);
	rs=ERR_reason_error_string(e);

	if (ls == NULL) 
		BIO_snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);
	if (fs == NULL)
		BIO_snprintf(fsbuf, sizeof(fsbuf), "func(%lu)", f);
	if (rs == NULL)
		BIO_snprintf(rsbuf, sizeof(rsbuf), "reason(%lu)", r);

	BIO_snprintf(buf, len,"error:%08lX:%s:%s:%s", e, ls?ls:lsbuf, 
		fs?fs:fsbuf, rs?rs:rsbuf);
	if (strlen(buf) == len-1)
		{
		/* output may be truncated; make sure we always have 5 
		 * colon-separated fields, i.e. 4 colons ... */
#define NUM_COLONS 4
		if (len > NUM_COLONS) /* ... if possible */
			{
			int i;
			char *s = buf;
			
			for (i = 0; i < NUM_COLONS; i++)
				{
				char *colon = strchr(s, ':');
				if (colon == NULL || colon > &buf[len-1] - NUM_COLONS + i)
					{
					/* set colon no. i at last possible position
					 * (buf[len-1] is the terminating 0)*/
					colon = &buf[len-1] - NUM_COLONS + i;
					*colon = ':';
					}
				s = colon + 1;
				}
			}
		}
	}

/* BAD for multi-threading: uses a local buffer if ret == NULL */
/* ERR_error_string_n should be used instead for ret != NULL
 * as ERR_error_string cannot know how large the buffer is */
char *ERR_error_string(unsigned long e, char *ret)
	{
	static char buf[256];

	if (ret == NULL) ret=buf;
	ERR_error_string_n(e, ret, 256);

	return(ret);
	}

LHASH *ERR_get_string_table(void)
	{
	return(error_hash);
	}

/* not thread-safe */
LHASH *ERR_get_err_state_table(void)
	{
	return(thread_hash);
	}

const char *ERR_lib_error_string(unsigned long e)
	{
	ERR_STRING_DATA d,*p=NULL;
	unsigned long l;

	l=ERR_GET_LIB(e);

	CRYPTO_w_lock(CRYPTO_LOCK_ERR_HASH);

	if (error_hash != NULL)
		{
		d.error=ERR_PACK(l,0,0);
		p=(ERR_STRING_DATA *)lh_retrieve(error_hash,&d);
		}

	CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);

	return((p == NULL)?NULL:p->string);
	}

const char *ERR_func_error_string(unsigned long e)
	{
	ERR_STRING_DATA d,*p=NULL;
	unsigned long l,f;

	l=ERR_GET_LIB(e);
	f=ERR_GET_FUNC(e);

	CRYPTO_w_lock(CRYPTO_LOCK_ERR_HASH);

	if (error_hash != NULL)
		{
		d.error=ERR_PACK(l,f,0);
		p=(ERR_STRING_DATA *)lh_retrieve(error_hash,&d);
		}

	CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);

	return((p == NULL)?NULL:p->string);
	}

const char *ERR_reason_error_string(unsigned long e)
	{
	ERR_STRING_DATA d,*p=NULL;
	unsigned long l,r;

	l=ERR_GET_LIB(e);
	r=ERR_GET_REASON(e);

	CRYPTO_w_lock(CRYPTO_LOCK_ERR_HASH);

	if (error_hash != NULL)
		{
		d.error=ERR_PACK(l,0,r);
		p=(ERR_STRING_DATA *)lh_retrieve(error_hash,&d);
		if (p == NULL)
			{
			d.error=ERR_PACK(0,0,r);
			p=(ERR_STRING_DATA *)lh_retrieve(error_hash,&d);
			}
		}

	CRYPTO_w_unlock(CRYPTO_LOCK_ERR_HASH);

	return((p == NULL)?NULL:p->string);
	}

static unsigned long err_hash(ERR_STRING_DATA *a)
	{
	unsigned long ret,l;

	l=a->error;
	ret=l^ERR_GET_LIB(l)^ERR_GET_FUNC(l);
	return(ret^ret%19*13);
	}

static int err_cmp(ERR_STRING_DATA *a, ERR_STRING_DATA *b)
	{
	return((int)(a->error-b->error));
	}

static unsigned long pid_hash(ERR_STATE *a)
	{
	return(a->pid*13);
	}

static int pid_cmp(ERR_STATE *a, ERR_STATE *b)
	{
	return((int)((long)a->pid - (long)b->pid));
	}

void ERR_remove_state(unsigned long pid)
	{
	ERR_STATE *p = NULL,tmp;

	if (thread_hash == NULL)
		return;
	if (pid == 0)
		pid=(unsigned long)CRYPTO_thread_id();
	tmp.pid=pid;
	CRYPTO_w_lock(CRYPTO_LOCK_ERR);
	if (thread_hash)
		{
		p=(ERR_STATE *)lh_delete(thread_hash,&tmp);
		if (lh_num_items(thread_hash) == 0)
			{
			/* make sure we don't leak memory */
			lh_free(thread_hash);
			thread_hash = NULL;
			}
		}
	CRYPTO_w_unlock(CRYPTO_LOCK_ERR);

	if (p != NULL) ERR_STATE_free(p);
	}

ERR_STATE *ERR_get_state(void)
	{
	static ERR_STATE fallback;
	ERR_STATE *ret=NULL,tmp,*tmpp=NULL;
	int thread_state_exists;
	int i;
	unsigned long pid;

	pid=(unsigned long)CRYPTO_thread_id();

	CRYPTO_w_lock(CRYPTO_LOCK_ERR);
	if (thread_hash != NULL)
		{
		tmp.pid=pid;
		ret=(ERR_STATE *)lh_retrieve(thread_hash,&tmp);
		}
	CRYPTO_w_unlock(CRYPTO_LOCK_ERR);

	/* ret == the error state, if NULL, make a new one */
	if (ret == NULL)
		{
		ret=(ERR_STATE *)OPENSSL_malloc(sizeof(ERR_STATE));
		if (ret == NULL) return(&fallback);
		ret->pid=pid;
		ret->top=0;
		ret->bottom=0;
		for (i=0; i<ERR_NUM_ERRORS; i++)
			{
			ret->err_data[i]=NULL;
			ret->err_data_flags[i]=0;
			}

		CRYPTO_w_lock(CRYPTO_LOCK_ERR);

		/* no entry yet in thread_hash for current thread -
		 * thus, it may have changed since we last looked at it */
		if (thread_hash == NULL)
			thread_hash = lh_new(pid_hash, pid_cmp);
		if (thread_hash == NULL)
			thread_state_exists = 0; /* allocation error */
		else
			{
			tmpp=(ERR_STATE *)lh_insert(thread_hash,ret);
			thread_state_exists = 1;
			}

		CRYPTO_w_unlock(CRYPTO_LOCK_ERR);

		if (!thread_state_exists)
			{
			ERR_STATE_free(ret); /* could not insert it */
			return(&fallback);
			}
		
		if (tmpp != NULL) /* old entry - should not happen */
			{
			ERR_STATE_free(tmpp);
			}
		}
	return(ret);
	}

int ERR_get_next_error_library(void)
	{
	static int value=ERR_LIB_USER;

	return(value++);
	}

void ERR_set_error_data(char *data, int flags)
	{
	ERR_STATE *es;
	int i;

	es=ERR_get_state();

	i=es->top;
	if (i == 0)
		i=ERR_NUM_ERRORS-1;

	es->err_data[i]=data;
	es->err_data_flags[es->top]=flags;
	}

void ERR_add_error_data(int num, ...)
	{
	va_list args;
	int i,n,s;
	char *str,*p,*a;

	s=64;
	str=OPENSSL_malloc(s+1);
	if (str == NULL) return;
	str[0]='\0';

	va_start(args, num);
	n=0;
	for (i=0; i<num; i++)
		{
		a=va_arg(args, char*);
		/* ignore NULLs, thanks to Bob Beck <[e-mail]> */
		if (a != NULL)
			{
			n+=strlen(a);
			if (n > s)
				{
				s=n+20;
				p=OPENSSL_realloc(str,s+1);
				if (p == NULL)
					{
					OPENSSL_free(str);
					return;
					}
				else
					str=p;
				}
			strcat(str,a);
			}
		}
	ERR_set_error_data(str,ERR_TXT_MALLOCED|ERR_TXT_STRING);

	va_end(args);
	}