src/chunk.c - haproxy - Gitiles

 /*
  * Chunk management functions.
  *
  * Copyright 2000-2012 Willy Tarreau <w@1wt.eu>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version
  * 2 of the License, or (at your option) any later version.
  *
  */

 #include <ctype.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <string.h>

 #include <haproxy/api.h>
 #include <haproxy/chunk.h>
 #include <haproxy/global.h>
 #include <haproxy/tools.h>

 /* trash chunks used for various conversions */
 static THREAD_LOCAL struct buffer *trash_chunk;
 static THREAD_LOCAL struct buffer trash_chunk1;
 static THREAD_LOCAL struct buffer trash_chunk2;

 /* trash buffers used for various conversions */
 static int trash_size __read_mostly;
 static THREAD_LOCAL char *trash_buf1;
 static THREAD_LOCAL char *trash_buf2;

 /* the trash pool for reentrant allocations */
 struct pool_head *pool_head_trash __read_mostly = NULL;

 /* this is used to drain data, and as a temporary buffer for sprintf()... */
 THREAD_LOCAL struct buffer trash = { };

 /*
 * Returns a pre-allocated and initialized trash chunk that can be used for any
 * type of conversion. Two chunks and their respective buffers are alternatively
 * returned so that it is always possible to iterate data transformations without
 * losing the data being transformed. The blocks are initialized to the size of
 * a standard buffer, so they should be enough for everything. For convenience,
 * a zero is always emitted at the beginning of the string so that it may be
 * used as an empty string as well.
 */
 struct buffer *get_trash_chunk(void)
 {
 	char *trash_buf;

 	if (trash_chunk == &trash_chunk1) {
 		trash_chunk = &trash_chunk2;
 		trash_buf = trash_buf2;
 	}
 	else {
 		trash_chunk = &trash_chunk1;
 		trash_buf = trash_buf1;
 	}
 	*trash_buf = 0;
 	chunk_init(trash_chunk, trash_buf, trash_size);
 	return trash_chunk;
 }

 /* (re)allocates the trash buffers. Returns 0 in case of failure. It is
  * possible to call this function multiple times if the trash size changes.
  */
 static int alloc_trash_buffers(int bufsize)
 {
 	chunk_init(&trash, my_realloc2(trash.area, bufsize), bufsize);
 	trash_size = bufsize;
 	trash_buf1 = (char *)my_realloc2(trash_buf1, bufsize);
 	trash_buf2 = (char *)my_realloc2(trash_buf2, bufsize);
 	return trash.area && trash_buf1 && trash_buf2;
 }

 static int alloc_trash_buffers_per_thread()
 {
 	return alloc_trash_buffers(global.tune.bufsize);
 }

 static void free_trash_buffers_per_thread()
 {
 	chunk_destroy(&trash);
 	free(trash_buf2);
 	free(trash_buf1);
 	trash_buf2 = NULL;
 	trash_buf1 = NULL;
 }

 /* Initialize the trash buffers. It returns 0 if an error occurred. */
 int init_trash_buffers(int first)
 {
 	pool_destroy(pool_head_trash);
 	pool_head_trash = create_pool("trash",
 				      sizeof(struct buffer) + global.tune.bufsize,
 				      MEM_F_EXACT);
 	if (!pool_head_trash || !alloc_trash_buffers(global.tune.bufsize))
 		return 0;
 	return 1;
 }

 /*
  * Allocate a trash chunk from the reentrant pool. The buffer starts at the
  * end of the chunk. This chunk must be freed using free_trash_chunk(). This
  * call may fail and the caller is responsible for checking that the returned
  * pointer is not NULL.
  */
 struct buffer *alloc_trash_chunk(void)
 {
 	struct buffer *chunk;

 	chunk = pool_alloc(pool_head_trash);
 	if (chunk) {
 		char *buf = (char *)chunk + sizeof(struct buffer);
 		*buf = 0;
 		chunk_init(chunk, buf,
 			   pool_head_trash->size - sizeof(struct buffer));
 	}
 	return chunk;
 }

 /*
  * Does an snprintf() at the beginning of chunk <chk>, respecting the limit of
  * at most chk->size chars. If the chk->len is over, nothing is added. Returns
  * the new chunk size, or < 0 in case of failure.
  */
 int chunk_printf(struct buffer *chk, const char *fmt, ...)
 {
 	va_list argp;
 	int ret;

 	if (!chk->area || !chk->size)
 		return 0;

 	va_start(argp, fmt);
 	ret = vsnprintf(chk->area, chk->size, fmt, argp);
 	va_end(argp);

 	if (ret >= chk->size)
 		return -1;

 	chk->data = ret;
 	return chk->data;
 }

 /*
  * Does an snprintf() at the end of chunk <chk>, respecting the limit of
  * at most chk->size chars. If the chk->len is over, nothing is added. Returns
  * the new chunk size.
  */
 int chunk_appendf(struct buffer *chk, const char *fmt, ...)
 {
 	va_list argp;
 	size_t room;
 	int ret;

 	if (!chk->area || !chk->size)
 		return 0;

 	room = chk->size - chk->data;
 	if (!room)
 		return chk->data;

 	va_start(argp, fmt);
 	ret = vsnprintf(chk->area + chk->data, room, fmt, argp);
 	if (ret >= room)
 		/* do not copy anything in case of truncation */
 		chk->area[chk->data] = 0;
 	else
 		chk->data += ret;
 	va_end(argp);
 	return chk->data;
 }

 /*
  * Encode chunk <src> into chunk <dst>, respecting the limit of at most
  * chk->size chars. Replace non-printable or special characters with "&#%d;".
  * If the chk->len is over, nothing is added. Returns the new chunk size.
  */
 int chunk_htmlencode(struct buffer *dst, struct buffer *src)
 {
 	int i, l;
 	int olen, free;
 	char c;

 	olen = dst->data;

 	for (i = 0; i < src->data; i++) {
 		free = dst->size - dst->data;

 		if (!free) {
 			dst->data = olen;
 			return dst->data;
 		}

 		c = src->area[i];

 		if (!isascii((unsigned char)c) || !isprint((unsigned char)c) || c == '&' || c == '"' || c == '\'' || c == '<' || c == '>') {
 			l = snprintf(dst->area + dst->data, free, "&#%u;",
 				     (unsigned char)c);

 			if (free < l) {
 				dst->data = olen;
 				return dst->data;
 			}

 			dst->data += l;
 		} else {
 			dst->area[dst->data] = c;
 			dst->data++;
 		}
 	}

 	return dst->data;
 }

 /*
  * Encode chunk <src> into chunk <dst>, respecting the limit of at most
  * chk->size chars. Replace non-printable or char passed in qc with "<%02X>".
  * If the chk->len is over, nothing is added. Returns the new chunk size.
  */
 int chunk_asciiencode(struct buffer *dst, struct buffer *src, char qc)
 {
 	int i, l;
 	int olen, free;
 	char c;

 	olen = dst->data;

 	for (i = 0; i < src->data; i++) {
 		free = dst->size - dst->data;

 		if (!free) {
 			dst->data = olen;
 			return dst->data;
 		}

 		c = src->area[i];

 		if (!isascii((unsigned char)c) || !isprint((unsigned char)c) || c == '<' || c == '>' || c == qc) {
 			l = snprintf(dst->area + dst->data, free, "<%02X>",
 				     (unsigned char)c);

 			if (free < l) {
 				dst->data = olen;
 				return dst->data;
 			}

 			dst->data += l;
 		} else {
 			dst->area[dst->data] = c;
 			dst->data++;
 		}
 	}

 	return dst->data;
 }

 /* Compares the string in chunk <chk> with the string in <str> which must be
  * zero-terminated. Return is the same as with strcmp(). Neither is allowed
  * to be null.
  */
 int chunk_strcmp(const struct buffer *chk, const char *str)
 {
 	const char *s1 = chk->area;
 	int len = chk->data;
 	int diff = 0;

 	do {
 		if (--len < 0) {
 			diff = (unsigned char)0 - (unsigned char)*str;
 			break;
 		}
 		diff = (unsigned char)*(s1++) - (unsigned char)*(str++);
 	} while (!diff);
 	return diff;
 }

 /* Case-insensitively compares the string in chunk <chk> with the string in
  * <str> which must be zero-terminated. Return is the same as with strcmp().
  * Neither is allowed to be null.
  */
 int chunk_strcasecmp(const struct buffer *chk, const char *str)
 {
 	const char *s1 = chk->area;
 	int len = chk->data;
 	int diff = 0;

 	do {
 		if (--len < 0) {
 			diff = (unsigned char)0 - (unsigned char)*str;
 			break;
 		}
 		diff = (unsigned char)*s1 - (unsigned char)*str;
 		if (unlikely(diff)) {
 			unsigned int l = (unsigned char)*s1;
 			unsigned int r = (unsigned char)*str;

 			l -= 'a';
 			r -= 'a';

 			if (likely(l <= (unsigned char)'z' - 'a'))
 				l -= 'a' - 'A';
 			if (likely(r <= (unsigned char)'z' - 'a'))
 				r -= 'a' - 'A';
 			diff = l - r;
 		}
 		s1++; str++;
 	} while (!diff);
 	return diff;
 }

 REGISTER_PER_THREAD_ALLOC(alloc_trash_buffers_per_thread);
 REGISTER_PER_THREAD_FREE(free_trash_buffers_per_thread);

 /*
  * Local variables:
  *  c-indent-level: 8
  *  c-basic-offset: 8
  * End:
  */
	/*
	* Chunk management functions.
	*
	* Copyright 2000-2012 Willy Tarreau <w@1wt.eu>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version
	* 2 of the License, or (at your option) any later version.
	*
	*/

	#include <ctype.h>
	#include <stdarg.h>
	#include <stdio.h>
	#include <string.h>

	#include <haproxy/api.h>
	#include <haproxy/chunk.h>
	#include <haproxy/global.h>
	#include <haproxy/tools.h>

	/* trash chunks used for various conversions */
	static THREAD_LOCAL struct buffer *trash_chunk;
	static THREAD_LOCAL struct buffer trash_chunk1;
	static THREAD_LOCAL struct buffer trash_chunk2;

	/* trash buffers used for various conversions */
	static int trash_size __read_mostly;
	static THREAD_LOCAL char *trash_buf1;
	static THREAD_LOCAL char *trash_buf2;

	/* the trash pool for reentrant allocations */
	struct pool_head *pool_head_trash __read_mostly = NULL;

	/* this is used to drain data, and as a temporary buffer for sprintf()... */
	THREAD_LOCAL struct buffer trash = { };

	/*
	* Returns a pre-allocated and initialized trash chunk that can be used for any
	* type of conversion. Two chunks and their respective buffers are alternatively
	* returned so that it is always possible to iterate data transformations without
	* losing the data being transformed. The blocks are initialized to the size of
	* a standard buffer, so they should be enough for everything. For convenience,
	* a zero is always emitted at the beginning of the string so that it may be
	* used as an empty string as well.
	*/
	struct buffer *get_trash_chunk(void)
	{
	char *trash_buf;

	if (trash_chunk == &trash_chunk1) {
	trash_chunk = &trash_chunk2;
	trash_buf = trash_buf2;
	}
	else {
	trash_chunk = &trash_chunk1;
	trash_buf = trash_buf1;
	}
	*trash_buf = 0;
	chunk_init(trash_chunk, trash_buf, trash_size);
	return trash_chunk;
	}

	/* (re)allocates the trash buffers. Returns 0 in case of failure. It is
	* possible to call this function multiple times if the trash size changes.
	*/
	static int alloc_trash_buffers(int bufsize)
	{
	chunk_init(&trash, my_realloc2(trash.area, bufsize), bufsize);
	trash_size = bufsize;
	trash_buf1 = (char *)my_realloc2(trash_buf1, bufsize);
	trash_buf2 = (char *)my_realloc2(trash_buf2, bufsize);
	return trash.area && trash_buf1 && trash_buf2;
	}

	static int alloc_trash_buffers_per_thread()
	{
	return alloc_trash_buffers(global.tune.bufsize);
	}

	static void free_trash_buffers_per_thread()
	{
	chunk_destroy(&trash);
	free(trash_buf2);
	free(trash_buf1);
	trash_buf2 = NULL;
	trash_buf1 = NULL;
	}

	/* Initialize the trash buffers. It returns 0 if an error occurred. */
	int init_trash_buffers(int first)
	{
	pool_destroy(pool_head_trash);
	pool_head_trash = create_pool("trash",
	sizeof(struct buffer) + global.tune.bufsize,
	MEM_F_EXACT);
	if (!pool_head_trash \|\| !alloc_trash_buffers(global.tune.bufsize))
	return 0;
	return 1;
	}

	/*
	* Allocate a trash chunk from the reentrant pool. The buffer starts at the
	* end of the chunk. This chunk must be freed using free_trash_chunk(). This
	* call may fail and the caller is responsible for checking that the returned
	* pointer is not NULL.
	*/
	struct buffer *alloc_trash_chunk(void)
	{
	struct buffer *chunk;

	chunk = pool_alloc(pool_head_trash);
	if (chunk) {
	char buf = (char )chunk + sizeof(struct buffer);
	*buf = 0;
	chunk_init(chunk, buf,
	pool_head_trash->size - sizeof(struct buffer));
	}
	return chunk;
	}

	/*
	* Does an snprintf() at the beginning of chunk <chk>, respecting the limit of
	* at most chk->size chars. If the chk->len is over, nothing is added. Returns
	* the new chunk size, or < 0 in case of failure.
	*/
	int chunk_printf(struct buffer chk, const char fmt, ...)
	{
	va_list argp;
	int ret;

	if (!chk->area \|\| !chk->size)
	return 0;

	va_start(argp, fmt);
	ret = vsnprintf(chk->area, chk->size, fmt, argp);
	va_end(argp);

	if (ret >= chk->size)
	return -1;

	chk->data = ret;
	return chk->data;
	}

	/*
	* Does an snprintf() at the end of chunk <chk>, respecting the limit of
	* at most chk->size chars. If the chk->len is over, nothing is added. Returns
	* the new chunk size.
	*/
	int chunk_appendf(struct buffer chk, const char fmt, ...)
	{
	va_list argp;
	size_t room;
	int ret;

	if (!chk->area \|\| !chk->size)
	return 0;

	room = chk->size - chk->data;
	if (!room)
	return chk->data;

	va_start(argp, fmt);
	ret = vsnprintf(chk->area + chk->data, room, fmt, argp);
	if (ret >= room)
	/* do not copy anything in case of truncation */
	chk->area[chk->data] = 0;
	else
	chk->data += ret;
	va_end(argp);
	return chk->data;
	}

	/*
	* Encode chunk <src> into chunk <dst>, respecting the limit of at most
	* chk->size chars. Replace non-printable or special characters with "&#%d;".
	* If the chk->len is over, nothing is added. Returns the new chunk size.
	*/
	int chunk_htmlencode(struct buffer dst, struct buffer src)
	{
	int i, l;
	int olen, free;
	char c;

	olen = dst->data;

	for (i = 0; i < src->data; i++) {
	free = dst->size - dst->data;

	if (!free) {
	dst->data = olen;
	return dst->data;
	}

	c = src->area[i];

	if (!isascii((unsigned char)c) \|\| !isprint((unsigned char)c) \|\| c == '&' \|\| c == '"' \|\| c == '\'' \|\| c == '<' \|\| c == '>') {
	l = snprintf(dst->area + dst->data, free, "&#%u;",
	(unsigned char)c);

	if (free < l) {
	dst->data = olen;
	return dst->data;
	}

	dst->data += l;
	} else {
	dst->area[dst->data] = c;
	dst->data++;
	}
	}

	return dst->data;
	}

	/*
	* Encode chunk <src> into chunk <dst>, respecting the limit of at most
	* chk->size chars. Replace non-printable or char passed in qc with "<%02X>".
	* If the chk->len is over, nothing is added. Returns the new chunk size.
	*/
	int chunk_asciiencode(struct buffer dst, struct buffer src, char qc)
	{
	int i, l;
	int olen, free;
	char c;

	olen = dst->data;

	for (i = 0; i < src->data; i++) {
	free = dst->size - dst->data;

	if (!free) {
	dst->data = olen;
	return dst->data;
	}

	c = src->area[i];

	if (!isascii((unsigned char)c) \|\| !isprint((unsigned char)c) \|\| c == '<' \|\| c == '>' \|\| c == qc) {
	l = snprintf(dst->area + dst->data, free, "<%02X>",
	(unsigned char)c);

	if (free < l) {
	dst->data = olen;
	return dst->data;
	}

	dst->data += l;
	} else {
	dst->area[dst->data] = c;
	dst->data++;
	}
	}

	return dst->data;
	}

	/* Compares the string in chunk <chk> with the string in <str> which must be
	* zero-terminated. Return is the same as with strcmp(). Neither is allowed
	* to be null.
	*/
	int chunk_strcmp(const struct buffer chk, const char str)
	{
	const char *s1 = chk->area;
	int len = chk->data;
	int diff = 0;

	do {
	if (--len < 0) {
	diff = (unsigned char)0 - (unsigned char)*str;
	break;
	}
	diff = (unsigned char)(s1++) - (unsigned char)(str++);
	} while (!diff);
	return diff;
	}

	/* Case-insensitively compares the string in chunk <chk> with the string in
	* <str> which must be zero-terminated. Return is the same as with strcmp().
	* Neither is allowed to be null.
	*/
	int chunk_strcasecmp(const struct buffer chk, const char str)
	{
	const char *s1 = chk->area;
	int len = chk->data;
	int diff = 0;

	do {
	if (--len < 0) {
	diff = (unsigned char)0 - (unsigned char)*str;
	break;
	}
	diff = (unsigned char)s1 - (unsigned char)str;
	if (unlikely(diff)) {
	unsigned int l = (unsigned char)*s1;
	unsigned int r = (unsigned char)*str;

	l -= 'a';
	r -= 'a';

	if (likely(l <= (unsigned char)'z' - 'a'))
	l -= 'a' - 'A';
	if (likely(r <= (unsigned char)'z' - 'a'))
	r -= 'a' - 'A';
	diff = l - r;
	}
	s1++; str++;
	} while (!diff);
	return diff;
	}

	REGISTER_PER_THREAD_ALLOC(alloc_trash_buffers_per_thread);
	REGISTER_PER_THREAD_FREE(free_trash_buffers_per_thread);

	/*
	* Local variables:
	* c-indent-level: 8
	* c-basic-offset: 8
	* End:
	*/