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/*
* ng_parse.c
*
* Copyright (c) 1999 Whistle Communications, Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Whistle Communications;
* provided, however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Whistle
* Communications, Inc. trademarks, including the mark "WHISTLE
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
* such appears in the above copyright notice or in the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* Author: Archie Cobbs <archie@whistle.com>
*
* $Whistle: ng_parse.c,v 1.3 1999/11/29 01:43:48 archie Exp $
* $FreeBSD: src/sys/netgraph/ng_parse.c,v 1.3 1999/12/07 05:50:47 julian Exp $
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/ctype.h>
#include <netinet/in.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
/* Compute alignment for primitive integral types */
struct int16_temp {
char x;
int16_t y;
};
struct int32_temp {
char x;
int32_t y;
};
struct int64_temp {
char x;
int64_t y;
};
#define INT8_ALIGNMENT 1
#define INT16_ALIGNMENT ((int)&((struct int16_temp *)0)->y)
#define INT32_ALIGNMENT ((int)&((struct int32_temp *)0)->y)
#define INT64_ALIGNMENT ((int)&((struct int64_temp *)0)->y)
/* Type of composite object: struct, array, or fixedarray */
enum comptype {
CT_STRUCT,
CT_ARRAY,
CT_FIXEDARRAY,
};
/* Composite types helper functions */
static int ng_parse_composite(const struct ng_parse_type *type,
const char *s, int *off, const u_char *start,
u_char *const buf, int *buflen, enum comptype ctype);
static int ng_unparse_composite(const struct ng_parse_type *type,
const u_char *data, int *off, char *cbuf, int cbuflen,
enum comptype ctype);
static int ng_get_composite_elem_default(const struct ng_parse_type *type,
int index, const u_char *start, u_char *buf,
int *buflen, enum comptype ctype);
static int ng_get_composite_len(const struct ng_parse_type *type,
const u_char *start, const u_char *buf,
enum comptype ctype);
static const struct ng_parse_type *ng_get_composite_etype(const struct
ng_parse_type *type, int index, enum comptype ctype);
static int ng_parse_get_elem_pad(const struct ng_parse_type *type,
int index, enum comptype ctype, int posn);
/* Parsing helper functions */
static int ng_parse_skip_value(const char *s, int off, int *lenp);
/* Poor man's virtual method calls */
#define METHOD(t,m) (ng_get_ ## m ## _method(t))
#define INVOKE(t,m) (*METHOD(t,m))
static ng_parse_t *ng_get_parse_method(const struct ng_parse_type *t);
static ng_unparse_t *ng_get_unparse_method(const struct ng_parse_type *t);
static ng_getDefault_t *ng_get_getDefault_method(const
struct ng_parse_type *t);
static ng_getAlign_t *ng_get_getAlign_method(const struct ng_parse_type *t);
#define ALIGNMENT(t) (METHOD(t, getAlign) == NULL ? \
0 : INVOKE(t, getAlign)(t))
/* For converting binary to string */
#define NG_PARSE_APPEND(fmt, args...) \
do { \
int len; \
\
len = snprintf((cbuf), (cbuflen), \
fmt , ## args); \
if (len >= (cbuflen)) \
return (ERANGE); \
(cbuf) += len; \
(cbuflen) -= len; \
} while (0)
/************************************************************************
PUBLIC FUNCTIONS
************************************************************************/
/*
* Convert an ASCII string to binary according to the supplied type descriptor
*/
int
ng_parse(const struct ng_parse_type *type,
const char *string, int *off, u_char *buf, int *buflen)
{
return INVOKE(type, parse)(type, string, off, buf, buf, buflen);
}
/*
* Convert binary to an ASCII string according to the supplied type descriptor
*/
int
ng_unparse(const struct ng_parse_type *type,
const u_char *data, char *cbuf, int cbuflen)
{
int off = 0;
return INVOKE(type, unparse)(type, data, &off, cbuf, cbuflen);
}
/*
* Fill in the default value according to the supplied type descriptor
*/
int
ng_parse_getDefault(const struct ng_parse_type *type, u_char *buf, int *buflen)
{
ng_getDefault_t *const func = METHOD(type, getDefault);
if (func == NULL)
return (EOPNOTSUPP);
return (*func)(type, buf, buf, buflen);
}
/************************************************************************
STRUCTURE TYPE
************************************************************************/
static int
ng_struct_parse(const struct ng_parse_type *type,
const char *s, int *off, const u_char *const start,
u_char *const buf, int *buflen)
{
return ng_parse_composite(type, s, off, start, buf, buflen, CT_STRUCT);
}
static int
ng_struct_unparse(const struct ng_parse_type *type,
const u_char *data, int *off, char *cbuf, int cbuflen)
{
return ng_unparse_composite(type, data, off, cbuf, cbuflen, CT_STRUCT);
}
static int
ng_struct_getDefault(const struct ng_parse_type *type,
const u_char *const start, u_char *buf, int *buflen)
{
int off = 0;
return ng_parse_composite(type,
"{}", &off, start, buf, buflen, CT_STRUCT);
}
static int
ng_struct_getAlign(const struct ng_parse_type *type)
{
const struct ng_parse_struct_info *si = type->info;
const struct ng_parse_struct_field *field;
int align = 0;
for (field = si->fields; field->name != NULL; field++) {
int falign = ALIGNMENT(field->type);
if (falign > align)
align = falign;
}
return align;
}
const struct ng_parse_type ng_parse_struct_type = {
NULL,
NULL,
NULL,
ng_struct_parse,
ng_struct_unparse,
ng_struct_getDefault,
ng_struct_getAlign
};
/************************************************************************
FIXED LENGTH ARRAY TYPE
************************************************************************/
static int
ng_fixedarray_parse(const struct ng_parse_type *type,
const char *s, int *off, const u_char *const start,
u_char *const buf, int *buflen)
{
return ng_parse_composite(type,
s, off, start, buf, buflen, CT_FIXEDARRAY);
}
static int
ng_fixedarray_unparse(const struct ng_parse_type *type,
const u_char *data, int *off, char *cbuf, int cbuflen)
{
return ng_unparse_composite(type,
data, off, cbuf, cbuflen, CT_FIXEDARRAY);
}
static int
ng_fixedarray_getDefault(const struct ng_parse_type *type,
const u_char *const start, u_char *buf, int *buflen)
{
int off = 0;
return ng_parse_composite(type,
"[]", &off, start, buf, buflen, CT_FIXEDARRAY);
}
static int
ng_fixedarray_getAlign(const struct ng_parse_type *type)
{
const struct ng_parse_fixedarray_info *fi = type->info;
return ALIGNMENT(fi->elementType);
}
const struct ng_parse_type ng_parse_fixedarray_type = {
NULL,
NULL,
NULL,
ng_fixedarray_parse,
ng_fixedarray_unparse,
ng_fixedarray_getDefault,
ng_fixedarray_getAlign
};
/************************************************************************
VARIABLE LENGTH ARRAY TYPE
************************************************************************/
static int
ng_array_parse(const struct ng_parse_type *type,
const char *s, int *off, const u_char *const start,
u_char *const buf, int *buflen)
{
return ng_parse_composite(type, s, off, start, buf, buflen, CT_ARRAY);
}
static int
ng_array_unparse(const struct ng_parse_type *type,
const u_char *data, int *off, char *cbuf, int cbuflen)
{
return ng_unparse_composite(type, data, off, cbuf, cbuflen, CT_ARRAY);
}
static int
ng_array_getDefault(const struct ng_parse_type *type,
const u_char *const start, u_char *buf, int *buflen)
{
int off = 0;
return ng_parse_composite(type,
"[]", &off, start, buf, buflen, CT_ARRAY);
}
static int
ng_array_getAlign(const struct ng_parse_type *type)
{
const struct ng_parse_array_info *ai = type->info;
return ALIGNMENT(ai->elementType);
}
const struct ng_parse_type ng_parse_array_type = {
NULL,
NULL,
NULL,
ng_array_parse,
ng_array_unparse,
ng_array_getDefault,
ng_array_getAlign
};
/************************************************************************
INT8 TYPE
************************************************************************/
static int
ng_int8_parse(const struct ng_parse_type *type,
const char *s, int *off, const u_char *const start,
u_char *const buf, int *buflen)
{
long val;
int8_t val8;
char *eptr;
val = strtol(s + *off, &eptr, 0);
if (val < -0x80 || val > 0xff || eptr == s + *off)
return (EINVAL);
*off = eptr - s;
val8 = (int8_t)val;
bcopy(&val8, buf, sizeof(int8_t));
*buflen = sizeof(int8_t);
return (0);
}
static int
ng_int8_unparse(const struct ng_parse_type *type,
const u_char *data, int *off, char *cbuf, int cbuflen)
{
int8_t val;
bcopy(data + *off, &val, sizeof(int8_t));
NG_PARSE_APPEND("%d", (int)val);
*off += sizeof(int8_t);
return (0);
}
static int
ng_int8_getDefault(const struct ng_parse_type *type,
const u_char *const start, u_char *buf, int *buflen)
{
int8_t val;
if (*buflen < sizeof(int8_t))
return (ERANGE);
val = 0;
bcopy(&val, buf, sizeof(int8_t));
*buflen = sizeof(int8_t);
return (0);
}
static int
ng_int8_getAlign(const struct ng_parse_type *type)
{
return INT8_ALIGNMENT;
}
const struct ng_parse_type ng_parse_int8_type = {
NULL,
NULL,
NULL,
ng_int8_parse,
ng_int8_unparse,
ng_int8_getDefault,
ng_int8_getAlign
};
/************************************************************************
INT16 TYPE
************************************************************************/
static int
ng_int16_parse(const struct ng_parse_type *type,
const char *s, int *off, const u_char *const start,
u_char *const buf, int *buflen)
{
long val;
int16_t val16;
char *eptr;
val = strtol(s + *off, &eptr, 0);
if (val < -0x8000 || val > 0xffff || eptr == s + *off)
return (EINVAL);
*off = eptr - s;
val16 = (int16_t)val;
bcopy(&val16, buf, sizeof(int16_t));
*buflen = sizeof(int16_t);
return (0);
}
static int
ng_int16_unparse(const struct ng_parse_type *type,
const u_char *data, int *off, char *cbuf, int cbuflen)
{
int16_t val;
bcopy(data + *off, &val, sizeof(int16_t));
NG_PARSE_APPEND("%d", (int)val);
*off += sizeof(int16_t);
return (0);
}
static int
ng_int16_getDefault(const struct ng_parse_type *type,
const u_char *const start, u_char *buf, int *buflen)
{
int16_t val;
if (*buflen < sizeof(int16_t))
return (ERANGE);
val = 0;
bcopy(&val, buf, sizeof(int16_t));
*buflen = sizeof(int16_t);
return (0);
}
static int
ng_int16_getAlign(const struct ng_parse_type *type)
{
return INT16_ALIGNMENT;
}
const struct ng_parse_type ng_parse_int16_type = {
NULL,
NULL,
NULL,
ng_int16_parse,
ng_int16_unparse,
ng_int16_getDefault,
ng_int16_getAlign
};
/************************************************************************
INT32 TYPE
************************************************************************/
static int
ng_int32_parse(const struct ng_parse_type *type,
const char *s, int *off, const u_char *const start,
u_char *const buf, int *buflen)
{
long val; /* assumes long is at least 32 bits */
int32_t val32;
char *eptr;
val = strtol(s + *off, &eptr, 0);
if (val < (long)-0x80000000
|| val > (u_long)0xffffffff || eptr == s + *off)
return (EINVAL);
*off = eptr - s;
val32 = (int32_t)val;
bcopy(&val32, buf, sizeof(int32_t));
*buflen = sizeof(int32_t);
return (0);
}
static int
ng_int32_unparse(const struct ng_parse_type *type,
const u_char *data, int *off, char *cbuf, int cbuflen)
{
int32_t val;
bcopy(data + *off, &val, sizeof(int32_t));
NG_PARSE_APPEND("%ld", (long)val);
*off += sizeof(int32_t);
return (0);
}
static int
ng_int32_getDefault(const struct ng_parse_type *type,
const u_char *const start, u_char *buf, int *buflen)
{
int32_t val;
if (*buflen < sizeof(int32_t))
return (ERANGE);
val = 0;
bcopy(&val, buf, sizeof(int32_t));
*buflen = sizeof(int32_t);
return (0);
}
static int
ng_int32_getAlign(const struct ng_parse_type *type)
{
return INT32_ALIGNMENT;
}
const struct ng_parse_type ng_parse_int32_type = {
NULL,
NULL,
NULL,
ng_int32_parse,
ng_int32_unparse,
ng_int32_getDefault,
ng_int32_getAlign
};
/************************************************************************
INT64 TYPE
************************************************************************/
static int
ng_int64_parse(const struct ng_parse_type *type,
const char *s, int *off, const u_char *const start,
u_char *const buf, int *buflen)
{
quad_t val;
int64_t val64;
char *eptr;
val = strtoq(s + *off, &eptr, 0);
if (eptr == s + *off)
return (EINVAL);
*off = eptr - s;
val64 = (int64_t)val;
bcopy(&val64, buf, sizeof(int64_t));
*buflen = sizeof(int64_t);
return (0);
}
static int
ng_int64_unparse(const struct ng_parse_type *type,
const u_char *data, int *off, char *cbuf, int cbuflen)
{
int64_t val;
bcopy(data + *off, &val, sizeof(int64_t));
NG_PARSE_APPEND("%lld", (long long)val);
*off += sizeof(int64_t);
return (0);
}
static int
ng_int64_getDefault(const struct ng_parse_type *type,
const u_char *const start, u_char *buf, int *buflen)
{
int64_t val;
if (*buflen < sizeof(int64_t))
return (ERANGE);
val = 0;
bcopy(&val, buf, sizeof(int64_t));
*buflen = sizeof(int64_t);
return (0);
}
static int
ng_int64_getAlign(const struct ng_parse_type *type)
{
return INT64_ALIGNMENT;
}
const struct ng_parse_type ng_parse_int64_type = {
NULL,
NULL,
NULL,
ng_int64_parse,
ng_int64_unparse,
ng_int64_getDefault,
ng_int64_getAlign
};
/************************************************************************
STRING TYPE
************************************************************************/
static int
ng_string_parse(const struct ng_parse_type *type,
const char *s, int *off, const u_char *const start,
u_char *const buf, int *buflen)
{
char *sval;
int len;
if ((sval = ng_get_string_token(s, off, &len)) == NULL)
return (EINVAL);
*off += len;
len = strlen(sval) + 1;
bcopy(sval, buf, len);
FREE(sval, M_NETGRAPH);
*buflen = len;
return (0);
}
static int
ng_string_unparse(const struct ng_parse_type *type,
const u_char *data, int *off, char *cbuf, int cbuflen)
{
const char *const raw = (const char *)data + *off;
char *const s = ng_encode_string(raw);
if (s == NULL)
return (ENOMEM);
NG_PARSE_APPEND("%s", s);
*off += strlen(raw) + 1;
FREE(s, M_NETGRAPH);
return (0);
}
static int
ng_string_getDefault(const struct ng_parse_type *type,
const u_char *const start, u_char *buf, int *buflen)
{
if (*buflen < 1)
return (ERANGE);
buf[0] = (u_char)'\0';
*buflen = 1;
return (0);
}
const struct ng_parse_type ng_parse_string_type = {
NULL,
NULL,
NULL,
ng_string_parse,
ng_string_unparse,
ng_string_getDefault,
NULL
};
/************************************************************************
FIXED BUFFER STRING TYPE
************************************************************************/
static int
ng_fixedstring_parse(const struct ng_parse_type *type,
const char *s, int *off, const u_char *const start,
u_char *const buf, int *buflen)
{
const struct ng_parse_fixedsstring_info *const fi = type->info;
char *sval;
int len;
if ((sval = ng_get_string_token(s, off, &len)) == NULL)
return (EINVAL);
if (strlen(sval) + 1 > fi->bufSize)
return (E2BIG);
*off += len;
len = strlen(sval) + 1;
bcopy(sval, buf, len);
FREE(sval, M_NETGRAPH);
bzero(buf + len, fi->bufSize - len);
*buflen = fi->bufSize;
return (0);
}
static int
ng_fixedstring_unparse(const struct ng_parse_type *type,
const u_char *data, int *off, char *cbuf, int cbuflen)
{
const struct ng_parse_fixedsstring_info *const fi = type->info;
int error, temp = *off;
if ((error = ng_string_unparse(type, data, &temp, cbuf, cbuflen)) != 0)
return (error);
*off += fi->bufSize;
return (0);
}
static int
ng_fixedstring_getDefault(const struct ng_parse_type *type,
const u_char *const start, u_char *buf, int *buflen)
{
const struct ng_parse_fixedsstring_info *const fi = type->info;
if (*buflen < fi->bufSize)
return (ERANGE);
bzero(buf, fi->bufSize);
*buflen = fi->bufSize;
return (0);
}
const struct ng_parse_type ng_parse_fixedstring_type = {
NULL,
NULL,
NULL,
ng_fixedstring_parse,
ng_fixedstring_unparse,
ng_fixedstring_getDefault,
NULL
};
const struct ng_parse_fixedsstring_info ng_parse_nodebuf_info = {
NG_NODELEN + 1
};
const struct ng_parse_type ng_parse_nodebuf_type = {
&ng_parse_fixedstring_type,
&ng_parse_nodebuf_info
};
const struct ng_parse_fixedsstring_info ng_parse_hookbuf_info = {
NG_HOOKLEN + 1
};
const struct ng_parse_type ng_parse_hookbuf_type = {
&ng_parse_fixedstring_type,
&ng_parse_hookbuf_info
};
const struct ng_parse_fixedsstring_info ng_parse_pathbuf_info = {
NG_PATHLEN + 1
};
const struct ng_parse_type ng_parse_pathbuf_type = {
&ng_parse_fixedstring_type,
&ng_parse_pathbuf_info
};
const struct ng_parse_fixedsstring_info ng_parse_typebuf_info = {
NG_TYPELEN + 1
};
const struct ng_parse_type ng_parse_typebuf_type = {
&ng_parse_fixedstring_type,
&ng_parse_typebuf_info
};
const struct ng_parse_fixedsstring_info ng_parse_cmdbuf_info = {
NG_CMDSTRLEN + 1
};
const struct ng_parse_type ng_parse_cmdbuf_type = {
&ng_parse_fixedstring_type,
&ng_parse_cmdbuf_info
};
/************************************************************************
IP ADDRESS TYPE
************************************************************************/
static int
ng_ipaddr_parse(const struct ng_parse_type *type,
const char *s, int *off, const u_char *const start,
u_char *const buf, int *buflen)
{
int i, error;
for (i = 0; i < 4; i++) {
if ((error = ng_int8_parse(&ng_parse_int8_type,
s, off, start, buf + i, buflen)) != 0)
return (error);
if (i < 3 && s[*off] != '.')
return (EINVAL);
(*off)++;
}
*buflen = 4;
return (0);
}
static int
ng_ipaddr_unparse(const struct ng_parse_type *type,
const u_char *data, int *off, char *cbuf, int cbuflen)
{
struct in_addr ip;
bcopy(data + *off, &ip, sizeof(ip));
NG_PARSE_APPEND("%d.%d.%d.%d", ((u_char *)&ip)[0],
((u_char *)&ip)[1], ((u_char *)&ip)[2], ((u_char *)&ip)[3]);
*off += sizeof(ip);
return (0);
}
static int
ng_ipaddr_getDefault(const struct ng_parse_type *type,
const u_char *const start, u_char *buf, int *buflen)
{
struct in_addr ip = { 0 };
if (*buflen < sizeof(ip))
return (ERANGE);
bcopy(&ip, buf, sizeof(ip));
*buflen = sizeof(ip);
return (0);
}
const struct ng_parse_type ng_parse_ipaddr_type = {
NULL,
NULL,
NULL,
ng_ipaddr_parse,
ng_ipaddr_unparse,
ng_ipaddr_getDefault,
ng_int32_getAlign
};
/************************************************************************
BYTE ARRAY TYPE
************************************************************************/
/* Get the length of a byte array */
static int
ng_parse_bytearray_subtype_getLength(const struct ng_parse_type *type,
const u_char *start, const u_char *buf)
{
ng_parse_array_getLength_t *const getLength = type->private;
return (*getLength)(type, start, buf);
}
static int
ng_bytearray_elem_unparse(const struct ng_parse_type *type,
const u_char *data, int *off, char *cbuf, int cbuflen)
{
int8_t val;
bcopy(data + *off, &val, sizeof(int8_t));
NG_PARSE_APPEND("0x%02x", (int)val & 0xff); /* always hex format */
*off += sizeof(int8_t);
return (0);
}
/* Byte array element type is int8, but always output in hex format */
const struct ng_parse_type ng_parse_bytearray_elem_type = {
&ng_parse_int8_type,
NULL,
NULL,
NULL,
ng_bytearray_elem_unparse,
NULL,
NULL
};
static const struct ng_parse_array_info ng_parse_bytearray_subtype_info = {
&ng_parse_bytearray_elem_type,
&ng_parse_bytearray_subtype_getLength,
NULL
};
static const struct ng_parse_type ng_parse_bytearray_subtype = {
&ng_parse_array_type,
&ng_parse_bytearray_subtype_info
};
static int
ng_bytearray_parse(const struct ng_parse_type *type,
const char *s, int *off, const u_char *const start,
u_char *const buf, int *buflen)
{
char *str;
int toklen;
/* We accept either an array of bytes or a string constant */
if ((str = ng_get_string_token(s, off, &toklen)) != NULL) {
ng_parse_array_getLength_t *const getLength = type->info;
int arraylen, slen;
arraylen = (*getLength)(type, start, buf);
if (arraylen > *buflen) {
FREE(str, M_NETGRAPH);
return (ERANGE);
}
slen = strlen(str) + 1;
if (slen > arraylen) {
FREE(str, M_NETGRAPH);
return (E2BIG);
}
bcopy(str, buf, slen);
bzero(buf + slen, arraylen - slen);
FREE(str, M_NETGRAPH);
*off += toklen;
*buflen = arraylen;
return (0);
} else {
struct ng_parse_type subtype;
subtype = ng_parse_bytearray_subtype;
(const void *)subtype.private = type->info;
return ng_array_parse(&subtype, s, off, start, buf, buflen);
}
}
static int
ng_bytearray_unparse(const struct ng_parse_type *type,
const u_char *data, int *off, char *cbuf, int cbuflen)
{
struct ng_parse_type subtype;
subtype = ng_parse_bytearray_subtype;
(const void *)subtype.private = type->info;
return ng_array_unparse(&subtype, data, off, cbuf, cbuflen);
}
static int
ng_bytearray_getDefault(const struct ng_parse_type *type,
const u_char *const start, u_char *buf, int *buflen)
{
struct ng_parse_type subtype;
subtype = ng_parse_bytearray_subtype;
(const void *)subtype.private = type->info;
return ng_array_getDefault(&subtype, start, buf, buflen);
}
const struct ng_parse_type ng_parse_bytearray_type = {
NULL,
NULL,
NULL,
ng_bytearray_parse,
ng_bytearray_unparse,
ng_bytearray_getDefault,
NULL
};
/************************************************************************
STRUCT NG_MESG TYPE
************************************************************************/
/* Get msg->header.arglen when "buf" is pointing to msg->data */
static int
ng_parse_ng_mesg_getLength(const struct ng_parse_type *type,
const u_char *start, const u_char *buf)
{
const struct ng_mesg *msg;
msg = (const struct ng_mesg *)(buf - sizeof(*msg));
return msg->header.arglen;
}
/* Type for the variable length data portion of a struct ng_mesg */
static const struct ng_parse_type ng_msg_data_type = {
&ng_parse_bytearray_type,
&ng_parse_ng_mesg_getLength
};
/* Type for the entire struct ng_mesg header with data section */
static const struct ng_parse_struct_info
ng_parse_ng_mesg_type_info = NG_GENERIC_NG_MESG_INFO(&ng_msg_data_type);
const struct ng_parse_type ng_parse_ng_mesg_type = {
&ng_parse_struct_type,
&ng_parse_ng_mesg_type_info,
};
/************************************************************************
COMPOSITE HELPER ROUTINES
************************************************************************/
/*
* Convert a structure or array from ASCII to binary
*/
static int
ng_parse_composite(const struct ng_parse_type *type, const char *s,
int *off, const u_char *const start, u_char *const buf, int *buflen,
const enum comptype ctype)
{
const int num = ng_get_composite_len(type, start, buf, ctype);
int nextIndex = 0; /* next implicit array index */
u_int index; /* field or element index */
int *foff; /* field value offsets in string */
int align, len, blen, error = 0;
/* Initialize */
MALLOC(foff, int *, num * sizeof(*foff), M_NETGRAPH, M_NOWAIT);
if (foff == NULL) {
error = ENOMEM;
goto done;
}
bzero(foff, num * sizeof(*foff));
/* Get opening brace/bracket */
if (ng_parse_get_token(s, off, &len)
!= (ctype == CT_STRUCT ? T_LBRACE : T_LBRACKET)) {
error = EINVAL;
goto done;
}
*off += len;
/* Get individual element value positions in the string */
for (;;) {
enum ng_parse_token tok;
/* Check for closing brace/bracket */
tok = ng_parse_get_token(s, off, &len);
if (tok == (ctype == CT_STRUCT ? T_RBRACE : T_RBRACKET)) {
*off += len;
break;
}
/* For arrays, the 'name' (ie, index) is optional, so
distinguish name from values by seeing if the next
token is an equals sign */
if (ctype != CT_STRUCT) {
int len2, off2;
char *eptr;
/* If an opening brace/bracket, index is implied */
if (tok == T_LBRACE || tok == T_LBRACKET) {
index = nextIndex++;
goto gotIndex;
}
/* Might be an index, might be a value, either way... */
if (tok != T_WORD) {
error = EINVAL;
goto done;
}
/* If no equals sign follows, index is implied */
off2 = *off + len;
if (ng_parse_get_token(s, &off2, &len2) != T_EQUALS) {
index = nextIndex++;
goto gotIndex;
}
/* Index was specified explicitly; parse it */
index = (u_int)strtoul(s + *off, &eptr, 0);
if (index < 0 || eptr - (s + *off) != len) {
error = EINVAL;
goto done;
}
nextIndex = index + 1;
*off += len + len2;
gotIndex:
} else { /* a structure field */
const struct ng_parse_struct_field *field = NULL;
const struct ng_parse_struct_info *si = type->info;
/* Find the field by name (required) in field list */
if (tok != T_WORD) {
error = EINVAL;
goto done;
}
for (index = 0; index < num; index++) {
field = &si->fields[index];
if (strncmp(&s[*off], field->name, len) == 0
&& field->name[len] == '\0')
break;
}
if (index == num) {
error = ENOENT;
goto done;
}
*off += len;
/* Get equals sign */
if (ng_parse_get_token(s, off, &len) != T_EQUALS) {
error = EINVAL;
goto done;
}
*off += len;
}
/* Check array index */
if (index >= num) {
error = E2BIG;
goto done;
}
/* Save value's position and skip over it for now */
if (foff[index] != 0) {
error = EALREADY; /* duplicate */
goto done;
}
while (isspace(s[*off]))
(*off)++;
foff[index] = *off;
if ((error = ng_parse_skip_value(s, *off, &len)) != 0)
goto done;
*off += len;
}
/* Now build binary structure from supplied values and defaults */
for (blen = index = 0; index < num; index++) {
const struct ng_parse_type *const
etype = ng_get_composite_etype(type, index, ctype);
int k, pad, vlen;
/* Zero-pad any alignment bytes */
pad = ng_parse_get_elem_pad(type, index, ctype, blen);
for (k = 0; k < pad; k++) {
if (blen >= *buflen) {
error = ERANGE;
goto done;
}
buf[blen++] = 0;
}
/* Get value */
vlen = *buflen - blen;
if (foff[index] == 0) { /* use default value */
error = ng_get_composite_elem_default(type, index,
start, buf + blen, &vlen, ctype);
} else { /* parse given value */
*off = foff[index];
error = INVOKE(etype, parse)(etype,
s, off, start, buf + blen, &vlen);
}
if (error != 0)
goto done;
blen += vlen;
}
/* Make total composite structure size a multiple of its alignment */
if ((align = ALIGNMENT(type)) != 0) {
while (blen % align != 0) {
if (blen >= *buflen) {
error = ERANGE;
goto done;
}
buf[blen++] = 0;
}
}
/* Done */
*buflen = blen;
done:
FREE(foff, M_NETGRAPH);
return (error);
}
/*
* Convert an array or structure from binary to ASCII
*/
static int
ng_unparse_composite(const struct ng_parse_type *type, const u_char *data,
int *off, char *cbuf, int cbuflen, const enum comptype ctype)
{
const int num = ng_get_composite_len(type, data, data + *off, ctype);
int nextIndex = 0, didOne = 0;
int error, index;
/* Opening brace/bracket */
NG_PARSE_APPEND("%c", (ctype == CT_STRUCT) ? '{' : '[');
/* Do each item */
for (index = 0; index < num; index++) {
const struct ng_parse_type *const
etype = ng_get_composite_etype(type, index, ctype);
u_char temp[1024];
/* Skip any alignment pad bytes */
*off += ng_parse_get_elem_pad(type, index, ctype, *off);
/* See if element is equal to its default value; skip if so */
if (*off < sizeof(temp)) {
int tempsize = sizeof(temp) - *off;
bcopy(data, temp, *off);
if (ng_get_composite_elem_default(type, index, temp,
temp + *off, &tempsize, ctype) == 0
&& bcmp(temp + *off, data + *off, tempsize) == 0) {
*off += tempsize;
continue;
}
}
/* Print name= */
NG_PARSE_APPEND(" ");
if (ctype != CT_STRUCT) {
if (index != nextIndex) {
nextIndex = index;
NG_PARSE_APPEND("%d=", index);
}
nextIndex++;
} else {
const struct ng_parse_struct_info *si = type->info;
NG_PARSE_APPEND("%s=", si->fields[index].name);
}
/* Print value */
if ((error = INVOKE(etype, unparse)
(etype, data, off, cbuf, cbuflen)) != 0)
return (error);
cbuflen -= strlen(cbuf);
cbuf += strlen(cbuf);
didOne = 1;
}
/* Closing brace/bracket */
NG_PARSE_APPEND("%s%c",
didOne ? " " : "", (ctype == CT_STRUCT) ? '}' : ']');
return (0);
}
/*
* Generate the default value for an element of an array or structure
* Returns EOPNOTSUPP if default value is unspecified.
*/
static int
ng_get_composite_elem_default(const struct ng_parse_type *type,
int index, const u_char *const start, u_char *buf, int *buflen,
const enum comptype ctype)
{
const struct ng_parse_type *etype;
ng_getDefault_t *func;
switch (ctype) {
case CT_STRUCT:
break;
case CT_ARRAY:
{
const struct ng_parse_array_info *const ai = type->info;
if (ai->getDefault != NULL) {
return (*ai->getDefault)(type,
index, start, buf, buflen);
}
break;
}
case CT_FIXEDARRAY:
{
const struct ng_parse_fixedarray_info *const fi = type->info;
if (*fi->getDefault != NULL) {
return (*fi->getDefault)(type,
index, start, buf, buflen);
}
break;
}
default:
panic("%s", __FUNCTION__);
}
/* Default to element type default */
etype = ng_get_composite_etype(type, index, ctype);
func = METHOD(etype, getDefault);
if (func == NULL)
return (EOPNOTSUPP);
return (*func)(etype, start, buf, buflen);
}
/*
* Get the number of elements in a struct, variable or fixed array.
*/
static int
ng_get_composite_len(const struct ng_parse_type *type,
const u_char *const start, const u_char *buf,
const enum comptype ctype)
{
switch (ctype) {
case CT_STRUCT:
{
const struct ng_parse_struct_info *const si = type->info;
int numFields = 0;
for (numFields = 0; ; numFields++) {
const struct ng_parse_struct_field *const
fi = &si->fields[numFields];
if (fi->name == NULL)
break;
}
return (numFields);
}
case CT_ARRAY:
{
const struct ng_parse_array_info *const ai = type->info;
return (*ai->getLength)(type, start, buf);
}
case CT_FIXEDARRAY:
{
const struct ng_parse_fixedarray_info *const fi = type->info;
return fi->length;
}
default:
panic("%s", __FUNCTION__);
}
return (0);
}
/*
* Return the type of the index'th element of a composite structure
*/
static const struct ng_parse_type *
ng_get_composite_etype(const struct ng_parse_type *type,
int index, const enum comptype ctype)
{
const struct ng_parse_type *etype = NULL;
switch (ctype) {
case CT_STRUCT:
{
const struct ng_parse_struct_info *const si = type->info;
etype = si->fields[index].type;
break;
}
case CT_ARRAY:
{
const struct ng_parse_array_info *const ai = type->info;
etype = ai->elementType;
break;
}
case CT_FIXEDARRAY:
{
const struct ng_parse_fixedarray_info *const fi = type->info;
etype = fi->elementType;
break;
}
default:
panic("%s", __FUNCTION__);
}
return (etype);
}
/*
* Get the number of bytes to skip to align for the next
* element in a composite structure.
*/
static int
ng_parse_get_elem_pad(const struct ng_parse_type *type,
int index, enum comptype ctype, int posn)
{
const struct ng_parse_type *const
etype = ng_get_composite_etype(type, index, ctype);
int align;
/* Get element's alignment, and possibly override */
align = ALIGNMENT(etype);
if (ctype == CT_STRUCT) {
const struct ng_parse_struct_info *si = type->info;
if (si->fields[index].alignment != 0)
align = si->fields[index].alignment;
}
/* Return number of bytes to skip to align */
return (align ? (align - (posn % align)) % align : 0);
}
/************************************************************************
PARSING HELPER ROUTINES
************************************************************************/
/*
* Skip over a value
*/
static int
ng_parse_skip_value(const char *s, int off0, int *lenp)
{
int len, nbracket, nbrace;
int off = off0;
len = nbracket = nbrace = 0;
do {
switch (ng_parse_get_token(s, &off, &len)) {
case T_LBRACKET:
nbracket++;
break;
case T_LBRACE:
nbrace++;
break;
case T_RBRACKET:
if (nbracket-- == 0)
return (EINVAL);
break;
case T_RBRACE:
if (nbrace-- == 0)
return (EINVAL);
break;
case T_EOF:
return (EINVAL);
default:
break;
}
off += len;
} while (nbracket > 0 || nbrace > 0);
*lenp = off - off0;
return (0);
}
/*
* Find the next token in the string, starting at offset *startp.
* Returns the token type, with *startp pointing to the first char
* and *lenp the length.
*/
enum ng_parse_token
ng_parse_get_token(const char *s, int *startp, int *lenp)
{
char *t;
int i;
while (isspace(s[*startp]))
(*startp)++;
switch (s[*startp]) {
case '\0':
*lenp = 0;
return T_EOF;
case '{':
*lenp = 1;
return T_LBRACE;
case '}':
*lenp = 1;
return T_RBRACE;
case '[':
*lenp = 1;
return T_LBRACKET;
case ']':
*lenp = 1;
return T_RBRACKET;
case '=':
*lenp = 1;
return T_EQUALS;
case '"':
if ((t = ng_get_string_token(s, startp, lenp)) == NULL)
return T_ERROR;
FREE(t, M_NETGRAPH);
return T_STRING;
default:
for (i = *startp + 1; s[i] != '\0' && !isspace(s[i])
&& s[i] != '{' && s[i] != '}' && s[i] != '['
&& s[i] != ']' && s[i] != '=' && s[i] != '"'; i++)
;
*lenp = i - *startp;
return T_WORD;
}
}
/*
* Get a string token, which must be enclosed in double quotes.
* The normal C backslash escapes are recognized.
*/
char *
ng_get_string_token(const char *s, int *startp, int *lenp)
{
char *cbuf, *p;
int start, off;
while (isspace(s[*startp]))
(*startp)++;
start = *startp;
if (s[*startp] != '"')
return (NULL);
MALLOC(cbuf, char *, strlen(s + start), M_NETGRAPH, M_NOWAIT);
if (cbuf == NULL)
return (NULL);
strcpy(cbuf, s + start + 1);
for (off = 1, p = cbuf; *p != '\0'; off++, p++) {
if (*p == '"') {
*p = '\0';
*lenp = off + 1;
return (cbuf);
} else if (p[0] == '\\' && p[1] != '\0') {
int x, k;
char *v;
strcpy(p, p + 1);
v = p;
switch (*p) {
case 't':
*v = '\t';
off++;
continue;
case 'n':
*v = '\n';
off++;
continue;
case 'r':
*v = '\r';
off++;
continue;
case 'v':
*v = '\v';
off++;
continue;
case 'f':
*v = '\f';
off++;
continue;
case '"':
*v = '"';
off++;
continue;
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
for (x = k = 0;
k < 3 && *v >= '0' && *v <= '7'; v++) {
x = (x << 3) + (*v - '0');
off++;
}
*--v = (char)x;
break;
case 'x':
for (v++, x = k = 0;
k < 2 && isxdigit(*v); v++) {
x = (x << 4) + (isdigit(*v) ?
(*v - '0') :
(tolower(*v) - 'a' + 10));
off++;
}
*--v = (char)x;
break;
default:
continue;
}
strcpy(p, v);
}
}
return (NULL); /* no closing quote */
}
/*
* Encode a string so it can be safely put in double quotes.
* Caller must free the result.
*/
char *
ng_encode_string(const char *raw)
{
char *cbuf;
int off = 0;
MALLOC(cbuf, char *, strlen(raw) * 4 + 3, M_NETGRAPH, M_NOWAIT);
if (cbuf == NULL)
return (NULL);
cbuf[off++] = '"';
for ( ; *raw != '\0'; raw++) {
switch (*raw) {
case '\t':
cbuf[off++] = '\\';
cbuf[off++] = 't';
break;
case '\f':
cbuf[off++] = '\\';
cbuf[off++] = 'f';
break;
case '\n':
cbuf[off++] = '\\';
cbuf[off++] = 'n';
break;
case '\r':
cbuf[off++] = '\\';
cbuf[off++] = 'r';
break;
case '\v':
cbuf[off++] = '\\';
cbuf[off++] = 'v';
break;
case '"':
case '\\':
cbuf[off++] = '\\';
cbuf[off++] = *raw;
break;
default:
if (*raw < 0x20 || *raw > 0x7e) {
off += sprintf(cbuf + off,
"\\x%02x", (u_char)*raw);
break;
}
cbuf[off++] = *raw;
break;
}
}
cbuf[off++] = '"';
cbuf[off] = '\0';
return (cbuf);
}
/************************************************************************
VIRTUAL METHOD LOOKUP
************************************************************************/
static ng_parse_t *
ng_get_parse_method(const struct ng_parse_type *t)
{
while (t != NULL && t->parse == NULL)
t = t->supertype;
return (t ? t->parse : NULL);
}
static ng_unparse_t *
ng_get_unparse_method(const struct ng_parse_type *t)
{
while (t != NULL && t->unparse == NULL)
t = t->supertype;
return (t ? t->unparse : NULL);
}
static ng_getDefault_t *
ng_get_getDefault_method(const struct ng_parse_type *t)
{
while (t != NULL && t->getDefault == NULL)
t = t->supertype;
return (t ? t->getDefault : NULL);
}
static ng_getAlign_t *
ng_get_getAlign_method(const struct ng_parse_type *t)
{
while (t != NULL && t->getAlign == NULL)
t = t->supertype;
return (t ? t->getAlign : NULL);
}
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