path: root/drivers/target/iscsi/iscsi_target_nego.c

/*******************************************************************************
 * This file contains main functions related to iSCSI Parameter negotiation.
 *
 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
 *
 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
 *
 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 ******************************************************************************/

#include <linux/ctype.h>
#include <scsi/iscsi_proto.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <target/iscsi/iscsi_transport.h>

#include "iscsi_target_core.h"
#include "iscsi_target_parameters.h"
#include "iscsi_target_login.h"
#include "iscsi_target_nego.h"
#include "iscsi_target_tpg.h"
#include "iscsi_target_util.h"
#include "iscsi_target.h"
#include "iscsi_target_auth.h"

#define MAX_LOGIN_PDUS  7
#define TEXT_LEN	4096

void convert_null_to_semi(char *buf, int len)
{
	int i;

	for (i = 0; i < len; i++)
		if (buf[i] == '\0')
			buf[i] = ';';
}

static int strlen_semi(char *buf)
{
	int i = 0;

	while (buf[i] != '\0') {
		if (buf[i] == ';')
			return i;
		i++;
	}

	return -1;
}

int extract_param(
	const char *in_buf,
	const char *pattern,
	unsigned int max_length,
	char *out_buf,
	unsigned char *type)
{
	char *ptr;
	int len;

	if (!in_buf || !pattern || !out_buf || !type)
		return -1;

	ptr = strstr(in_buf, pattern);
	if (!ptr)
		return -1;

	ptr = strstr(ptr, "=");
	if (!ptr)
		return -1;

	ptr += 1;
	if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
		ptr += 2; /* skip 0x */
		*type = HEX;
	} else
		*type = DECIMAL;

	len = strlen_semi(ptr);
	if (len < 0)
		return -1;

	if (len > max_length) {
		pr_err("Length of input: %d exceeds max_length:"
			" %d\n", len, max_length);
		return -1;
	}
	memcpy(out_buf, ptr, len);
	out_buf[len] = '\0';

	return