GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: sbin/isakmpd/field.c Lines: 0 60 0.0 %
Date: 2017-11-13 Branches: 0 30 0.0 %

Line Branch Exec Source
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/* $OpenBSD: field.c,v 1.22 2017/04/02 21:23:44 tom Exp $	 */
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/* $EOM: field.c,v 1.11 2000/02/20 19:58:37 niklas Exp $	 */
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/*
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 * Copyright (c) 1998, 1999 Niklas Hallqvist.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/*
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 * This code was written under funding by Ericsson Radio Systems.
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <netinet/in.h>
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#include "constants.h"
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#include "field.h"
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#include "log.h"
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#include "util.h"
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static char    *field_debug_raw(u_int8_t *, size_t, struct constant_map **);
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static char    *field_debug_num(u_int8_t *, size_t, struct constant_map **);
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static char    *field_debug_mask(u_int8_t *, size_t, struct constant_map **);
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static char    *field_debug_ign(u_int8_t *, size_t, struct constant_map **);
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static char    *field_debug_cst(u_int8_t *, size_t, struct constant_map **);
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/* Contents must match the enum in struct field.  */
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static char    *(*decode_field[]) (u_int8_t *, size_t,
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    struct constant_map **) = {
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	field_debug_raw,
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	field_debug_num,
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	field_debug_mask,
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	field_debug_ign,
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	field_debug_cst
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};
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/*
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 * Return a string showing the hexadecimal contents of the LEN-sized buffer
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 * BUF.  MAPS should be zero and is only here because the API requires it.
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 */
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static char *
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field_debug_raw(u_int8_t *buf, size_t len, struct constant_map **maps)
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{
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	return raw2hex(buf, len);
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}
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/*
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 * Convert the unsigned LEN-sized number at BUF of network byteorder to a
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 * 32-bit unsigned integer of host byteorder pointed to by VAL.
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 */
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static int
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extract_val(u_int8_t *buf, size_t len, u_int32_t *val)
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{
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	switch (len) {
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	case 1:
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		*val = *buf;
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		break;
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	case 2:
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		*val = decode_16(buf);
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		break;
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	case 4:
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		*val = decode_32(buf);
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		break;
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	default:
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		return -1;
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	}
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	return 0;
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}
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/*
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 * Return a textual representation of the unsigned number pointed to by BUF
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 * which is LEN octets long.  MAPS should be zero and is only here because
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 * the API requires it.
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 */
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static char *
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field_debug_num(u_int8_t *buf, size_t len, struct constant_map **maps)
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{
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	char           *retval;
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	u_int32_t       val;
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	if (extract_val(buf, len, &val))
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		return NULL;
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	if (asprintf(&retval, "%u", val) == -1)
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		return NULL;
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	return retval;
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}
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/*
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 * Return the symbolic names of the flags pointed to by BUF which is LEN
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 * octets long, using the constant maps MAPS.
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 */
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static char *
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field_debug_mask(u_int8_t *buf, size_t len, struct constant_map **maps)
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{
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	u_int32_t       val;
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	u_int32_t       bit;
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	char           *retval, *new_buf, *name;
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	size_t          buf_sz;
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	if (extract_val(buf, len, &val))
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		return NULL;
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	/* Size for brackets, two spaces and a NUL terminator.  */
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	buf_sz = 4;
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	retval = malloc(buf_sz);
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	if (!retval)
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		return NULL;
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	strlcpy(retval, "[ ", buf_sz);
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	for (bit = 1; bit; bit <<= 1) {
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		if (val & bit) {
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			name = constant_name_maps(maps, bit);
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			buf_sz += strlen(name) + 1;
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			new_buf = realloc(retval, buf_sz);
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			if (!new_buf) {
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				free(retval);
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				return NULL;
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			}
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			retval = new_buf;
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			strlcat(retval, name, buf_sz);
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			strlcat(retval, " ", buf_sz);
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		}
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	}
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	strlcat(retval, "]", buf_sz);
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	return retval;
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}
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/*
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 * Just a dummy needed to skip the unused LEN sized space at BUF.  MAPS
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 * should be zero and is only here because the API requires it.
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 */
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static char *
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field_debug_ign(u_int8_t *buf, size_t len, struct constant_map **maps)
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{
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	return NULL;
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}
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/*
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 * Return the symbolic name of a constant pointed to by BUF which is LEN
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 * octets long, using the constant maps MAPS.
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 */
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static char *
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field_debug_cst(u_int8_t *buf, size_t len, struct constant_map **maps)
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{
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	u_int32_t       val;
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	if (extract_val(buf, len, &val))
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		return NULL;
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	return strdup(constant_name_maps(maps, val));
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}
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/* Pretty-print a field from BUF as described by F.  */
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void
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field_dump_field(struct field *f, u_int8_t *buf)
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{
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	char	*value;
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	value = decode_field[(int) f->type] (buf + f->offset, f->len, f->maps);
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	if (value) {
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		LOG_DBG((LOG_MESSAGE, 70, "%s: %s", f->name, value));
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		free(value);
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	}
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}
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/* Pretty-print all the fields of BUF as described in FIELDS.  */
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void
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field_dump_payload(struct field *fields, u_int8_t *buf)
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{
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	struct field   *field;
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	for (field = fields; field->name; field++)
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		field_dump_field(field, buf);
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}
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/* Return the numeric value of the field F of BUF.  */
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u_int32_t
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field_get_num(struct field *f, u_int8_t *buf)
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{
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	u_int32_t       val;
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	if (extract_val(buf + f->offset, f->len, &val))
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		return 0;
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	return val;
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}
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/* Stash the number VAL into BUF's field F.  */
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void
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field_set_num(struct field *f, u_int8_t *buf, u_int32_t val)
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{
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	switch (f->len) {
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	case 1:
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		buf[f->offset] = val;
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		break;
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	case 2:
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		encode_16(buf + f->offset, val);
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		break;
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	case 4:
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		encode_32(buf + f->offset, val);
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		break;
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	}
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}
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/* Stash BUF's raw field F into VAL.  */
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void
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field_get_raw(struct field *f, u_int8_t *buf, u_int8_t *val)
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{
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	memcpy(val, buf + f->offset, f->len);
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}
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/* Stash the buffer VAL into BUF's field F.  */
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void
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field_set_raw(struct field *f, u_int8_t *buf, u_int8_t *val)
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{
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	memcpy(buf + f->offset, val, f->len);
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}