6 * Copyright (c) 1999 Whistle Communications, Inc.
9 * Subject to the following obligations and disclaimer of warranty, use and
10 * redistribution of this software, in source or object code forms, with or
11 * without modifications are expressly permitted by Whistle Communications;
12 * provided, however, that:
13 * 1. Any and all reproductions of the source or object code must include the
14 * copyright notice above and the following disclaimer of warranties; and
15 * 2. No rights are granted, in any manner or form, to use Whistle
16 * Communications, Inc. trademarks, including the mark "WHISTLE
17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as
18 * such appears in the above copyright notice or in the software.
20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
38 * Author: Archie Cobbs <archie@freebsd.org>
40 * $Whistle: ng_parse.c,v 1.3 1999/11/29 01:43:48 archie Exp $
44 #include <sys/types.h>
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/errno.h>
49 #include <sys/limits.h>
50 #include <sys/malloc.h>
52 #include <sys/ctype.h>
54 #include <machine/stdarg.h>
56 #include <net/ethernet.h>
58 #include <netinet/in.h>
60 #include <netgraph/ng_message.h>
61 #include <netgraph/netgraph.h>
62 #include <netgraph/ng_parse.h>
64 #ifdef NG_SEPARATE_MALLOC
65 static MALLOC_DEFINE(M_NETGRAPH_PARSE, "netgraph_parse", "netgraph parse info");
67 #define M_NETGRAPH_PARSE M_NETGRAPH
70 /* Compute alignment for primitive integral types */
86 #define INT8_ALIGNMENT 1
87 #define INT16_ALIGNMENT ((size_t)&((struct int16_temp *)0)->y)
88 #define INT32_ALIGNMENT ((size_t)&((struct int32_temp *)0)->y)
89 #define INT64_ALIGNMENT ((size_t)&((struct int64_temp *)0)->y)
91 /* Output format for integral types */
92 #define INT_UNSIGNED 0
96 /* Type of composite object: struct, array, or fixedarray */
103 /* Composite types helper functions */
104 static int ng_parse_composite(const struct ng_parse_type *type,
105 const char *s, int *off, const u_char *start,
106 u_char *const buf, int *buflen, enum comptype ctype);
107 static int ng_unparse_composite(const struct ng_parse_type *type,
108 const u_char *data, int *off, char *cbuf, int cbuflen,
109 enum comptype ctype);
110 static int ng_get_composite_elem_default(const struct ng_parse_type *type,
111 int index, const u_char *start, u_char *buf,
112 int *buflen, enum comptype ctype);
113 static int ng_get_composite_len(const struct ng_parse_type *type,
114 const u_char *start, const u_char *buf,
115 enum comptype ctype);
116 static const struct ng_parse_type *ng_get_composite_etype(const struct
117 ng_parse_type *type, int index, enum comptype ctype);
118 static int ng_parse_get_elem_pad(const struct ng_parse_type *type,
119 int index, enum comptype ctype, int posn);
121 /* Parsing helper functions */
122 static int ng_parse_skip_value(const char *s, int off, int *lenp);
123 static int ng_parse_append(char **cbufp, int *cbuflenp,
124 const char *fmt, ...);
126 /* Poor man's virtual method calls */
127 #define METHOD(t,m) (ng_get_ ## m ## _method(t))
128 #define INVOKE(t,m) (*METHOD(t,m))
130 static ng_parse_t *ng_get_parse_method(const struct ng_parse_type *t);
131 static ng_unparse_t *ng_get_unparse_method(const struct ng_parse_type *t);
132 static ng_getDefault_t *ng_get_getDefault_method(const
133 struct ng_parse_type *t);
134 static ng_getAlign_t *ng_get_getAlign_method(const struct ng_parse_type *t);
136 #define ALIGNMENT(t) (METHOD(t, getAlign) == NULL ? \
137 0 : INVOKE(t, getAlign)(t))
139 /************************************************************************
141 ************************************************************************/
144 * Convert an ASCII string to binary according to the supplied type descriptor
147 ng_parse(const struct ng_parse_type *type,
148 const char *string, int *off, u_char *buf, int *buflen)
150 return INVOKE(type, parse)(type, string, off, buf, buf, buflen);
154 * Convert binary to an ASCII string according to the supplied type descriptor
157 ng_unparse(const struct ng_parse_type *type,
158 const u_char *data, char *cbuf, int cbuflen)
162 return INVOKE(type, unparse)(type, data, &off, cbuf, cbuflen);
166 * Fill in the default value according to the supplied type descriptor
169 ng_parse_getDefault(const struct ng_parse_type *type, u_char *buf, int *buflen)
171 ng_getDefault_t *const func = METHOD(type, getDefault);
175 return (*func)(type, buf, buf, buflen);
179 /************************************************************************
181 ************************************************************************/
184 ng_struct_parse(const struct ng_parse_type *type,
185 const char *s, int *off, const u_char *const start,
186 u_char *const buf, int *buflen)
188 return ng_parse_composite(type, s, off, start, buf, buflen, CT_STRUCT);
192 ng_struct_unparse(const struct ng_parse_type *type,
193 const u_char *data, int *off, char *cbuf, int cbuflen)
195 return ng_unparse_composite(type, data, off, cbuf, cbuflen, CT_STRUCT);
199 ng_struct_getDefault(const struct ng_parse_type *type,
200 const u_char *const start, u_char *buf, int *buflen)
204 return ng_parse_composite(type,
205 "{}", &off, start, buf, buflen, CT_STRUCT);
209 ng_struct_getAlign(const struct ng_parse_type *type)
211 const struct ng_parse_struct_field *field;
214 for (field = type->info; field->name != NULL; field++) {
215 int falign = ALIGNMENT(field->type);
223 const struct ng_parse_type ng_parse_struct_type = {
229 ng_struct_getDefault,
233 /************************************************************************
234 FIXED LENGTH ARRAY TYPE
235 ************************************************************************/
238 ng_fixedarray_parse(const struct ng_parse_type *type,
239 const char *s, int *off, const u_char *const start,
240 u_char *const buf, int *buflen)
242 return ng_parse_composite(type,
243 s, off, start, buf, buflen, CT_FIXEDARRAY);
247 ng_fixedarray_unparse(const struct ng_parse_type *type,
248 const u_char *data, int *off, char *cbuf, int cbuflen)
250 return ng_unparse_composite(type,
251 data, off, cbuf, cbuflen, CT_FIXEDARRAY);
255 ng_fixedarray_getDefault(const struct ng_parse_type *type,
256 const u_char *const start, u_char *buf, int *buflen)
260 return ng_parse_composite(type,
261 "[]", &off, start, buf, buflen, CT_FIXEDARRAY);
265 ng_fixedarray_getAlign(const struct ng_parse_type *type)
267 const struct ng_parse_fixedarray_info *fi = type->info;
269 return ALIGNMENT(fi->elementType);
272 const struct ng_parse_type ng_parse_fixedarray_type = {
277 ng_fixedarray_unparse,
278 ng_fixedarray_getDefault,
279 ng_fixedarray_getAlign
282 /************************************************************************
283 VARIABLE LENGTH ARRAY TYPE
284 ************************************************************************/
287 ng_array_parse(const struct ng_parse_type *type,
288 const char *s, int *off, const u_char *const start,
289 u_char *const buf, int *buflen)
291 return ng_parse_composite(type, s, off, start, buf, buflen, CT_ARRAY);
295 ng_array_unparse(const struct ng_parse_type *type,
296 const u_char *data, int *off, char *cbuf, int cbuflen)
298 return ng_unparse_composite(type, data, off, cbuf, cbuflen, CT_ARRAY);
302 ng_array_getDefault(const struct ng_parse_type *type,
303 const u_char *const start, u_char *buf, int *buflen)
307 return ng_parse_composite(type,
308 "[]", &off, start, buf, buflen, CT_ARRAY);
312 ng_array_getAlign(const struct ng_parse_type *type)
314 const struct ng_parse_array_info *ai = type->info;
316 return ALIGNMENT(ai->elementType);
319 const struct ng_parse_type ng_parse_array_type = {
329 /************************************************************************
331 ************************************************************************/
334 ng_int8_parse(const struct ng_parse_type *type,
335 const char *s, int *off, const u_char *const start,
336 u_char *const buf, int *buflen)
342 val = strtol(s + *off, &eptr, 0);
343 if (val < (int8_t)0x80 || val > (u_int8_t)0xff || eptr == s + *off)
347 bcopy(&val8, buf, sizeof(int8_t));
348 *buflen = sizeof(int8_t);
353 ng_int8_unparse(const struct ng_parse_type *type,
354 const u_char *data, int *off, char *cbuf, int cbuflen)
361 bcopy(data + *off, &val, sizeof(int8_t));
362 switch ((intptr_t)type->info) {
369 fval = (u_int8_t)val;
373 fval = (u_int8_t)val;
376 panic("%s: unknown type", __func__);
378 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0)
380 *off += sizeof(int8_t);
385 ng_int8_getDefault(const struct ng_parse_type *type,
386 const u_char *const start, u_char *buf, int *buflen)
390 if (*buflen < sizeof(int8_t))
393 bcopy(&val, buf, sizeof(int8_t));
394 *buflen = sizeof(int8_t);
399 ng_int8_getAlign(const struct ng_parse_type *type)
401 return INT8_ALIGNMENT;
404 const struct ng_parse_type ng_parse_int8_type = {
414 const struct ng_parse_type ng_parse_uint8_type = {
419 const struct ng_parse_type ng_parse_hint8_type = {
424 /************************************************************************
426 ************************************************************************/
429 ng_int16_parse(const struct ng_parse_type *type,
430 const char *s, int *off, const u_char *const start,
431 u_char *const buf, int *buflen)
437 val = strtol(s + *off, &eptr, 0);
438 if (val < (int16_t)0x8000
439 || val > (u_int16_t)0xffff || eptr == s + *off)
442 val16 = (int16_t)val;
443 bcopy(&val16, buf, sizeof(int16_t));
444 *buflen = sizeof(int16_t);
449 ng_int16_unparse(const struct ng_parse_type *type,
450 const u_char *data, int *off, char *cbuf, int cbuflen)
457 bcopy(data + *off, &val, sizeof(int16_t));
458 switch ((intptr_t)type->info) {
465 fval = (u_int16_t)val;
469 fval = (u_int16_t)val;
472 panic("%s: unknown type", __func__);
474 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0)
476 *off += sizeof(int16_t);
481 ng_int16_getDefault(const struct ng_parse_type *type,
482 const u_char *const start, u_char *buf, int *buflen)
486 if (*buflen < sizeof(int16_t))
489 bcopy(&val, buf, sizeof(int16_t));
490 *buflen = sizeof(int16_t);
495 ng_int16_getAlign(const struct ng_parse_type *type)
497 return INT16_ALIGNMENT;
500 const struct ng_parse_type ng_parse_int16_type = {
510 const struct ng_parse_type ng_parse_uint16_type = {
511 &ng_parse_int16_type,
515 const struct ng_parse_type ng_parse_hint16_type = {
516 &ng_parse_int16_type,
520 /************************************************************************
522 ************************************************************************/
525 ng_int32_parse(const struct ng_parse_type *type,
526 const char *s, int *off, const u_char *const start,
527 u_char *const buf, int *buflen)
529 long val; /* assumes long is at least 32 bits */
533 if ((intptr_t)type->info == INT_SIGNED)
534 val = strtol(s + *off, &eptr, 0);
536 val = strtoul(s + *off, &eptr, 0);
537 if (val < (int32_t)0x80000000
538 || val > (u_int32_t)0xffffffff || eptr == s + *off)
541 val32 = (int32_t)val;
542 bcopy(&val32, buf, sizeof(int32_t));
543 *buflen = sizeof(int32_t);
548 ng_int32_unparse(const struct ng_parse_type *type,
549 const u_char *data, int *off, char *cbuf, int cbuflen)
556 bcopy(data + *off, &val, sizeof(int32_t));
557 switch ((intptr_t)type->info) {
564 fval = (u_int32_t)val;
568 fval = (u_int32_t)val;
571 panic("%s: unknown type", __func__);
573 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0)
575 *off += sizeof(int32_t);
580 ng_int32_getDefault(const struct ng_parse_type *type,
581 const u_char *const start, u_char *buf, int *buflen)
585 if (*buflen < sizeof(int32_t))
588 bcopy(&val, buf, sizeof(int32_t));
589 *buflen = sizeof(int32_t);
594 ng_int32_getAlign(const struct ng_parse_type *type)
596 return INT32_ALIGNMENT;
599 const struct ng_parse_type ng_parse_int32_type = {
609 const struct ng_parse_type ng_parse_uint32_type = {
610 &ng_parse_int32_type,
614 const struct ng_parse_type ng_parse_hint32_type = {
615 &ng_parse_int32_type,
619 /************************************************************************
621 ************************************************************************/
624 ng_int64_parse(const struct ng_parse_type *type,
625 const char *s, int *off, const u_char *const start,
626 u_char *const buf, int *buflen)
632 val = strtoq(s + *off, &eptr, 0);
633 if (eptr == s + *off)
636 val64 = (int64_t)val;
637 bcopy(&val64, buf, sizeof(int64_t));
638 *buflen = sizeof(int64_t);
643 ng_int64_unparse(const struct ng_parse_type *type,
644 const u_char *data, int *off, char *cbuf, int cbuflen)
651 bcopy(data + *off, &val, sizeof(int64_t));
652 switch ((intptr_t)type->info) {
659 fval = (u_int64_t)val;
663 fval = (u_int64_t)val;
666 panic("%s: unknown type", __func__);
668 if ((error = ng_parse_append(&cbuf, &cbuflen, fmt, fval)) != 0)
670 *off += sizeof(int64_t);
675 ng_int64_getDefault(const struct ng_parse_type *type,
676 const u_char *const start, u_char *buf, int *buflen)
680 if (*buflen < sizeof(int64_t))
683 bcopy(&val, buf, sizeof(int64_t));
684 *buflen = sizeof(int64_t);
689 ng_int64_getAlign(const struct ng_parse_type *type)
691 return INT64_ALIGNMENT;
694 const struct ng_parse_type ng_parse_int64_type = {
704 const struct ng_parse_type ng_parse_uint64_type = {
705 &ng_parse_int64_type,
709 const struct ng_parse_type ng_parse_hint64_type = {
710 &ng_parse_int64_type,
714 /************************************************************************
716 ************************************************************************/
719 ng_string_parse(const struct ng_parse_type *type,
720 const char *s, int *off, const u_char *const start,
721 u_char *const buf, int *buflen)
727 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL)
730 bcopy(sval, buf, slen + 1);
731 free(sval, M_NETGRAPH_PARSE);
737 ng_string_unparse(const struct ng_parse_type *type,
738 const u_char *data, int *off, char *cbuf, int cbuflen)
740 const char *const raw = (const char *)data + *off;
741 char *const s = ng_encode_string(raw, strlen(raw));
746 if ((error = ng_parse_append(&cbuf, &cbuflen, "%s", s)) != 0) {
747 free(s, M_NETGRAPH_PARSE);
750 *off += strlen(raw) + 1;
751 free(s, M_NETGRAPH_PARSE);
756 ng_string_getDefault(const struct ng_parse_type *type,
757 const u_char *const start, u_char *buf, int *buflen)
762 buf[0] = (u_char)'\0';
767 const struct ng_parse_type ng_parse_string_type = {
773 ng_string_getDefault,
777 /************************************************************************
778 FIXED BUFFER STRING TYPE
779 ************************************************************************/
782 ng_fixedstring_parse(const struct ng_parse_type *type,
783 const char *s, int *off, const u_char *const start,
784 u_char *const buf, int *buflen)
786 const struct ng_parse_fixedstring_info *const fi = type->info;
791 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL)
793 if (slen + 1 > fi->bufSize) {
794 free(sval, M_NETGRAPH_PARSE);
798 bcopy(sval, buf, slen);
799 free(sval, M_NETGRAPH_PARSE);
800 bzero(buf + slen, fi->bufSize - slen);
801 *buflen = fi->bufSize;
806 ng_fixedstring_unparse(const struct ng_parse_type *type,
807 const u_char *data, int *off, char *cbuf, int cbuflen)
809 const struct ng_parse_fixedstring_info *const fi = type->info;
810 int error, temp = *off;
812 if ((error = ng_string_unparse(type, data, &temp, cbuf, cbuflen)) != 0)
819 ng_fixedstring_getDefault(const struct ng_parse_type *type,
820 const u_char *const start, u_char *buf, int *buflen)
822 const struct ng_parse_fixedstring_info *const fi = type->info;
824 if (*buflen < fi->bufSize)
826 bzero(buf, fi->bufSize);
827 *buflen = fi->bufSize;
831 const struct ng_parse_type ng_parse_fixedstring_type = {
835 ng_fixedstring_parse,
836 ng_fixedstring_unparse,
837 ng_fixedstring_getDefault,
841 const struct ng_parse_fixedstring_info ng_parse_nodebuf_info = {
844 const struct ng_parse_type ng_parse_nodebuf_type = {
845 &ng_parse_fixedstring_type,
846 &ng_parse_nodebuf_info
849 const struct ng_parse_fixedstring_info ng_parse_hookbuf_info = {
852 const struct ng_parse_type ng_parse_hookbuf_type = {
853 &ng_parse_fixedstring_type,
854 &ng_parse_hookbuf_info
857 const struct ng_parse_fixedstring_info ng_parse_pathbuf_info = {
860 const struct ng_parse_type ng_parse_pathbuf_type = {
861 &ng_parse_fixedstring_type,
862 &ng_parse_pathbuf_info
865 const struct ng_parse_fixedstring_info ng_parse_typebuf_info = {
868 const struct ng_parse_type ng_parse_typebuf_type = {
869 &ng_parse_fixedstring_type,
870 &ng_parse_typebuf_info
873 const struct ng_parse_fixedstring_info ng_parse_cmdbuf_info = {
876 const struct ng_parse_type ng_parse_cmdbuf_type = {
877 &ng_parse_fixedstring_type,
878 &ng_parse_cmdbuf_info
881 /************************************************************************
882 EXPLICITLY SIZED STRING TYPE
883 ************************************************************************/
886 ng_sizedstring_parse(const struct ng_parse_type *type,
887 const char *s, int *off, const u_char *const start,
888 u_char *const buf, int *buflen)
894 if ((sval = ng_get_string_token(s, off, &len, &slen)) == NULL)
896 if (slen > USHRT_MAX) {
897 free(sval, M_NETGRAPH_PARSE);
901 *((u_int16_t *)buf) = (u_int16_t)slen;
902 bcopy(sval, buf + 2, slen);
903 free(sval, M_NETGRAPH_PARSE);
909 ng_sizedstring_unparse(const struct ng_parse_type *type,
910 const u_char *data, int *off, char *cbuf, int cbuflen)
912 const char *const raw = (const char *)data + *off + 2;
913 const int slen = *((const u_int16_t *)(data + *off));
914 char *const s = ng_encode_string(raw, slen);
919 if ((error = ng_parse_append(&cbuf, &cbuflen, "%s", s)) != 0) {
920 free(s, M_NETGRAPH_PARSE);
923 free(s, M_NETGRAPH_PARSE);
929 ng_sizedstring_getDefault(const struct ng_parse_type *type,
930 const u_char *const start, u_char *buf, int *buflen)
939 const struct ng_parse_type ng_parse_sizedstring_type = {
943 ng_sizedstring_parse,
944 ng_sizedstring_unparse,
945 ng_sizedstring_getDefault,
949 /************************************************************************
951 ************************************************************************/
954 ng_ipaddr_parse(const struct ng_parse_type *type,
955 const char *s, int *off, const u_char *const start,
956 u_char *const buf, int *buflen)
960 for (i = 0; i < 4; i++) {
961 if ((error = ng_int8_parse(&ng_parse_int8_type,
962 s, off, start, buf + i, buflen)) != 0)
964 if (i < 3 && s[*off] != '.')
973 ng_ipaddr_unparse(const struct ng_parse_type *type,
974 const u_char *data, int *off, char *cbuf, int cbuflen)
979 bcopy(data + *off, &ip, sizeof(ip));
980 if ((error = ng_parse_append(&cbuf, &cbuflen, "%d.%d.%d.%d",
981 ((u_char *)&ip)[0], ((u_char *)&ip)[1],
982 ((u_char *)&ip)[2], ((u_char *)&ip)[3])) != 0)
989 ng_ipaddr_getDefault(const struct ng_parse_type *type,
990 const u_char *const start, u_char *buf, int *buflen)
992 struct in_addr ip = { 0 };
994 if (*buflen < sizeof(ip))
996 bcopy(&ip, buf, sizeof(ip));
997 *buflen = sizeof(ip);
1001 const struct ng_parse_type ng_parse_ipaddr_type = {
1007 ng_ipaddr_getDefault,
1011 /************************************************************************
1012 ETHERNET ADDRESS TYPE
1013 ************************************************************************/
1016 ng_enaddr_parse(const struct ng_parse_type *type,
1017 const char *s, int *const off, const u_char *const start,
1018 u_char *const buf, int *const buflen)
1024 if (*buflen < ETHER_ADDR_LEN)
1026 for (i = 0; i < ETHER_ADDR_LEN; i++) {
1027 val = strtoul(s + *off, &eptr, 16);
1028 if (val > 0xff || eptr == s + *off)
1030 buf[i] = (u_char)val;
1032 if (i < ETHER_ADDR_LEN - 1) {
1038 *buflen = ETHER_ADDR_LEN;
1043 ng_enaddr_unparse(const struct ng_parse_type *type,
1044 const u_char *data, int *off, char *cbuf, int cbuflen)
1048 len = snprintf(cbuf, cbuflen, "%02x:%02x:%02x:%02x:%02x:%02x",
1049 data[*off], data[*off + 1], data[*off + 2],
1050 data[*off + 3], data[*off + 4], data[*off + 5]);
1053 *off += ETHER_ADDR_LEN;
1057 const struct ng_parse_type ng_parse_enaddr_type = {
1067 /************************************************************************
1069 ************************************************************************/
1071 /* Get the length of a byte array */
1073 ng_parse_bytearray_subtype_getLength(const struct ng_parse_type *type,
1074 const u_char *start, const u_char *buf)
1076 ng_parse_array_getLength_t *const getLength = type->private;
1078 return (*getLength)(type, start, buf);
1081 /* Byte array element type is hex int8 */
1082 static const struct ng_parse_array_info ng_parse_bytearray_subtype_info = {
1083 &ng_parse_hint8_type,
1084 &ng_parse_bytearray_subtype_getLength,
1087 static const struct ng_parse_type ng_parse_bytearray_subtype = {
1088 &ng_parse_array_type,
1089 &ng_parse_bytearray_subtype_info
1093 ng_bytearray_parse(const struct ng_parse_type *type,
1094 const char *s, int *off, const u_char *const start,
1095 u_char *const buf, int *buflen)
1101 /* We accept either an array of bytes or a string constant */
1102 if ((str = ng_get_string_token(s, off, &toklen, &slen)) != NULL) {
1103 ng_parse_array_getLength_t *const getLength = type->info;
1106 arraylen = (*getLength)(type, start, buf);
1107 if (arraylen > *buflen) {
1108 free(str, M_NETGRAPH_PARSE);
1111 if (slen > arraylen) {
1112 free(str, M_NETGRAPH_PARSE);
1115 bcopy(str, buf, slen);
1116 bzero(buf + slen, arraylen - slen);
1117 free(str, M_NETGRAPH_PARSE);
1122 struct ng_parse_type subtype;
1124 subtype = ng_parse_bytearray_subtype;
1125 *(const void **)&subtype.private = type->info;
1126 return ng_array_parse(&subtype, s, off, start, buf, buflen);
1131 ng_bytearray_unparse(const struct ng_parse_type *type,
1132 const u_char *data, int *off, char *cbuf, int cbuflen)
1134 struct ng_parse_type subtype;
1136 subtype = ng_parse_bytearray_subtype;
1137 *(const void **)&subtype.private = type->info;
1138 return ng_array_unparse(&subtype, data, off, cbuf, cbuflen);
1142 ng_bytearray_getDefault(const struct ng_parse_type *type,
1143 const u_char *const start, u_char *buf, int *buflen)
1145 struct ng_parse_type subtype;
1147 subtype = ng_parse_bytearray_subtype;
1148 *(const void **)&subtype.private = type->info;
1149 return ng_array_getDefault(&subtype, start, buf, buflen);
1152 const struct ng_parse_type ng_parse_bytearray_type = {
1157 ng_bytearray_unparse,
1158 ng_bytearray_getDefault,
1162 /************************************************************************
1164 ************************************************************************/
1166 /* Get msg->header.arglen when "buf" is pointing to msg->data */
1168 ng_parse_ng_mesg_getLength(const struct ng_parse_type *type,
1169 const u_char *start, const u_char *buf)
1171 const struct ng_mesg *msg;
1173 msg = (const struct ng_mesg *)(buf - sizeof(*msg));
1174 return msg->header.arglen;
1177 /* Type for the variable length data portion of a struct ng_mesg */
1178 static const struct ng_parse_type ng_msg_data_type = {
1179 &ng_parse_bytearray_type,
1180 &ng_parse_ng_mesg_getLength
1183 /* Type for the entire struct ng_mesg header with data section */
1184 static const struct ng_parse_struct_field ng_parse_ng_mesg_type_fields[]
1185 = NG_GENERIC_NG_MESG_INFO(&ng_msg_data_type);
1186 const struct ng_parse_type ng_parse_ng_mesg_type = {
1187 &ng_parse_struct_type,
1188 &ng_parse_ng_mesg_type_fields,
1191 /************************************************************************
1192 COMPOSITE HELPER ROUTINES
1193 ************************************************************************/
1196 * Convert a structure or array from ASCII to binary
1199 ng_parse_composite(const struct ng_parse_type *type, const char *s,
1200 int *off, const u_char *const start, u_char *const buf, int *buflen,
1201 const enum comptype ctype)
1203 const int num = ng_get_composite_len(type, start, buf, ctype);
1204 int nextIndex = 0; /* next implicit array index */
1205 u_int index; /* field or element index */
1206 int *foff; /* field value offsets in string */
1207 int align, len, blen, error = 0;
1210 foff = malloc(num * sizeof(*foff), M_NETGRAPH_PARSE, M_NOWAIT | M_ZERO);
1216 /* Get opening brace/bracket */
1217 if (ng_parse_get_token(s, off, &len)
1218 != (ctype == CT_STRUCT ? T_LBRACE : T_LBRACKET)) {
1224 /* Get individual element value positions in the string */
1226 enum ng_parse_token tok;
1228 /* Check for closing brace/bracket */
1229 tok = ng_parse_get_token(s, off, &len);
1230 if (tok == (ctype == CT_STRUCT ? T_RBRACE : T_RBRACKET)) {
1235 /* For arrays, the 'name' (ie, index) is optional, so
1236 distinguish name from values by seeing if the next
1237 token is an equals sign */
1238 if (ctype != CT_STRUCT) {
1242 /* If an opening brace/bracket, index is implied */
1243 if (tok == T_LBRACE || tok == T_LBRACKET) {
1244 index = nextIndex++;
1248 /* Might be an index, might be a value, either way... */
1249 if (tok != T_WORD) {
1254 /* If no equals sign follows, index is implied */
1256 if (ng_parse_get_token(s, &off2, &len2) != T_EQUALS) {
1257 index = nextIndex++;
1261 /* Index was specified explicitly; parse it */
1262 index = (u_int)strtoul(s + *off, &eptr, 0);
1263 if (index < 0 || eptr - (s + *off) != len) {
1267 nextIndex = index + 1;
1269 } else { /* a structure field */
1270 const struct ng_parse_struct_field *const
1271 fields = type->info;
1273 /* Find the field by name (required) in field list */
1274 if (tok != T_WORD) {
1278 for (index = 0; index < num; index++) {
1279 const struct ng_parse_struct_field *const
1280 field = &fields[index];
1282 if (strncmp(&s[*off], field->name, len) == 0
1283 && field->name[len] == '\0')
1292 /* Get equals sign */
1293 if (ng_parse_get_token(s, off, &len) != T_EQUALS) {
1301 /* Check array index */
1307 /* Save value's position and skip over it for now */
1308 if (foff[index] != 0) {
1309 error = EALREADY; /* duplicate */
1312 while (isspace(s[*off]))
1315 if ((error = ng_parse_skip_value(s, *off, &len)) != 0)
1320 /* Now build binary structure from supplied values and defaults */
1321 for (blen = index = 0; index < num; index++) {
1322 const struct ng_parse_type *const
1323 etype = ng_get_composite_etype(type, index, ctype);
1326 /* Zero-pad any alignment bytes */
1327 pad = ng_parse_get_elem_pad(type, index, ctype, blen);
1328 for (k = 0; k < pad; k++) {
1329 if (blen >= *buflen) {
1337 vlen = *buflen - blen;
1338 if (foff[index] == 0) { /* use default value */
1339 error = ng_get_composite_elem_default(type, index,
1340 start, buf + blen, &vlen, ctype);
1341 } else { /* parse given value */
1343 error = INVOKE(etype, parse)(etype,
1344 s, off, start, buf + blen, &vlen);
1351 /* Make total composite structure size a multiple of its alignment */
1352 if ((align = ALIGNMENT(type)) != 0) {
1353 while (blen % align != 0) {
1354 if (blen >= *buflen) {
1366 free(foff, M_NETGRAPH_PARSE);
1371 * Convert an array or structure from binary to ASCII
1374 ng_unparse_composite(const struct ng_parse_type *type, const u_char *data,
1375 int *off, char *cbuf, int cbuflen, const enum comptype ctype)
1377 const struct ng_mesg *const hdr
1378 = (const struct ng_mesg *)(data - sizeof(*hdr));
1379 const int num = ng_get_composite_len(type, data, data + *off, ctype);
1380 const int workSize = 20 * 1024; /* XXX hard coded constant */
1381 int nextIndex = 0, didOne = 0;
1385 /* Get workspace for checking default values */
1386 workBuf = malloc(workSize, M_NETGRAPH_PARSE, M_NOWAIT);
1387 if (workBuf == NULL)
1390 /* Opening brace/bracket */
1391 if ((error = ng_parse_append(&cbuf, &cbuflen, "%c",
1392 (ctype == CT_STRUCT) ? '{' : '[')) != 0)
1396 for (index = 0; index < num; index++) {
1397 const struct ng_parse_type *const
1398 etype = ng_get_composite_etype(type, index, ctype);
1400 /* Skip any alignment pad bytes */
1401 *off += ng_parse_get_elem_pad(type, index, ctype, *off);
1404 * See if element is equal to its default value; skip if so.
1405 * Copy struct ng_mesg header for types that peek into it.
1407 if (sizeof(*hdr) + *off < workSize) {
1408 int tempsize = workSize - sizeof(*hdr) - *off;
1410 bcopy(hdr, workBuf, sizeof(*hdr) + *off);
1411 if (ng_get_composite_elem_default(type, index, workBuf
1412 + sizeof(*hdr), workBuf + sizeof(*hdr) + *off,
1413 &tempsize, ctype) == 0
1414 && bcmp(workBuf + sizeof(*hdr) + *off,
1415 data + *off, tempsize) == 0) {
1422 if ((error = ng_parse_append(&cbuf, &cbuflen, " ")) != 0)
1424 if (ctype != CT_STRUCT) {
1425 if (index != nextIndex) {
1427 if ((error = ng_parse_append(&cbuf,
1428 &cbuflen, "%d=", index)) != 0)
1433 const struct ng_parse_struct_field *const
1434 fields = type->info;
1436 if ((error = ng_parse_append(&cbuf,
1437 &cbuflen, "%s=", fields[index].name)) != 0)
1442 if ((error = INVOKE(etype, unparse)
1443 (etype, data, off, cbuf, cbuflen)) != 0) {
1444 free(workBuf, M_NETGRAPH_PARSE);
1447 cbuflen -= strlen(cbuf);
1448 cbuf += strlen(cbuf);
1452 /* Closing brace/bracket */
1453 error = ng_parse_append(&cbuf, &cbuflen, "%s%c",
1454 didOne ? " " : "", (ctype == CT_STRUCT) ? '}' : ']');
1457 /* Clean up after failure */
1458 free(workBuf, M_NETGRAPH_PARSE);
1463 * Generate the default value for an element of an array or structure
1464 * Returns EOPNOTSUPP if default value is unspecified.
1467 ng_get_composite_elem_default(const struct ng_parse_type *type,
1468 int index, const u_char *const start, u_char *buf, int *buflen,
1469 const enum comptype ctype)
1471 const struct ng_parse_type *etype;
1472 ng_getDefault_t *func;
1479 const struct ng_parse_array_info *const ai = type->info;
1481 if (ai->getDefault != NULL) {
1482 return (*ai->getDefault)(type,
1483 index, start, buf, buflen);
1489 const struct ng_parse_fixedarray_info *const fi = type->info;
1491 if (*fi->getDefault != NULL) {
1492 return (*fi->getDefault)(type,
1493 index, start, buf, buflen);
1498 panic("%s", __func__);
1501 /* Default to element type default */
1502 etype = ng_get_composite_etype(type, index, ctype);
1503 func = METHOD(etype, getDefault);
1505 return (EOPNOTSUPP);
1506 return (*func)(etype, start, buf, buflen);
1510 * Get the number of elements in a struct, variable or fixed array.
1513 ng_get_composite_len(const struct ng_parse_type *type,
1514 const u_char *const start, const u_char *buf,
1515 const enum comptype ctype)
1520 const struct ng_parse_struct_field *const fields = type->info;
1523 for (numFields = 0; ; numFields++) {
1524 const struct ng_parse_struct_field *const
1525 fi = &fields[numFields];
1527 if (fi->name == NULL)
1534 const struct ng_parse_array_info *const ai = type->info;
1536 return (*ai->getLength)(type, start, buf);
1540 const struct ng_parse_fixedarray_info *const fi = type->info;
1545 panic("%s", __func__);
1551 * Return the type of the index'th element of a composite structure
1553 static const struct ng_parse_type *
1554 ng_get_composite_etype(const struct ng_parse_type *type,
1555 int index, const enum comptype ctype)
1557 const struct ng_parse_type *etype = NULL;
1562 const struct ng_parse_struct_field *const fields = type->info;
1564 etype = fields[index].type;
1569 const struct ng_parse_array_info *const ai = type->info;
1571 etype = ai->elementType;
1576 const struct ng_parse_fixedarray_info *const fi = type->info;
1578 etype = fi->elementType;
1582 panic("%s", __func__);
1588 * Get the number of bytes to skip to align for the next
1589 * element in a composite structure.
1592 ng_parse_get_elem_pad(const struct ng_parse_type *type,
1593 int index, enum comptype ctype, int posn)
1595 const struct ng_parse_type *const
1596 etype = ng_get_composite_etype(type, index, ctype);
1599 /* Get element's alignment, and possibly override */
1600 align = ALIGNMENT(etype);
1601 if (ctype == CT_STRUCT) {
1602 const struct ng_parse_struct_field *const fields = type->info;
1604 if (fields[index].alignment != 0)
1605 align = fields[index].alignment;
1608 /* Return number of bytes to skip to align */
1609 return (align ? (align - (posn % align)) % align : 0);
1612 /************************************************************************
1613 PARSING HELPER ROUTINES
1614 ************************************************************************/
1617 * Append to a fixed length string buffer.
1620 ng_parse_append(char **cbufp, int *cbuflenp, const char *fmt, ...)
1625 va_start(args, fmt);
1626 len = vsnprintf(*cbufp, *cbuflenp, fmt, args);
1628 if (len >= *cbuflenp)
1640 ng_parse_skip_value(const char *s, int off0, int *lenp)
1642 int len, nbracket, nbrace;
1645 len = nbracket = nbrace = 0;
1647 switch (ng_parse_get_token(s, &off, &len)) {
1655 if (nbracket-- == 0)
1668 } while (nbracket > 0 || nbrace > 0);
1674 * Find the next token in the string, starting at offset *startp.
1675 * Returns the token type, with *startp pointing to the first char
1676 * and *lenp the length.
1679 ng_parse_get_token(const char *s, int *startp, int *lenp)
1684 while (isspace(s[*startp]))
1686 switch (s[*startp]) {
1706 if ((t = ng_get_string_token(s, startp, lenp, NULL)) == NULL)
1708 free(t, M_NETGRAPH_PARSE);
1711 for (i = *startp + 1; s[i] != '\0' && !isspace(s[i])
1712 && s[i] != '{' && s[i] != '}' && s[i] != '['
1713 && s[i] != ']' && s[i] != '=' && s[i] != '"'; i++)
1715 *lenp = i - *startp;
1721 * Get a string token, which must be enclosed in double quotes.
1722 * The normal C backslash escapes are recognized.
1725 ng_get_string_token(const char *s, int *startp, int *lenp, int *slenp)
1731 while (isspace(s[*startp]))
1734 if (s[*startp] != '"')
1736 cbuf = malloc(strlen(s + start), M_NETGRAPH_PARSE, M_NOWAIT);
1739 strcpy(cbuf, s + start + 1);
1740 for (slen = 0, off = 1, p = cbuf; *p != '\0'; slen++, off++, p++) {
1747 } else if (p[0] == '\\' && p[1] != '\0') {
1778 case '0': case '1': case '2': case '3':
1779 case '4': case '5': case '6': case '7':
1781 k < 3 && *v >= '0' && *v <= '7'; v++) {
1782 x = (x << 3) + (*v - '0');
1788 for (v++, x = k = 0;
1789 k < 2 && isxdigit(*v); v++) {
1790 x = (x << 4) + (isdigit(*v) ?
1792 (tolower(*v) - 'a' + 10));
1803 free(cbuf, M_NETGRAPH_PARSE);
1804 return (NULL); /* no closing quote */
1808 * Encode a string so it can be safely put in double quotes.
1809 * Caller must free the result. Exactly "slen" characters
1813 ng_encode_string(const char *raw, int slen)
1819 cbuf = malloc(strlen(raw) * 4 + 3, M_NETGRAPH_PARSE, M_NOWAIT);
1823 for (i = 0; i < slen; i++, raw++) {
1851 if (*raw < 0x20 || *raw > 0x7e) {
1852 off += sprintf(cbuf + off,
1853 "\\x%02x", (u_char)*raw);
1865 /************************************************************************
1866 VIRTUAL METHOD LOOKUP
1867 ************************************************************************/
1870 ng_get_parse_method(const struct ng_parse_type *t)
1872 while (t != NULL && t->parse == NULL)
1874 return (t ? t->parse : NULL);
1877 static ng_unparse_t *
1878 ng_get_unparse_method(const struct ng_parse_type *t)
1880 while (t != NULL && t->unparse == NULL)
1882 return (t ? t->unparse : NULL);
1885 static ng_getDefault_t *
1886 ng_get_getDefault_method(const struct ng_parse_type *t)
1888 while (t != NULL && t->getDefault == NULL)
1890 return (t ? t->getDefault : NULL);
1893 static ng_getAlign_t *
1894 ng_get_getAlign_method(const struct ng_parse_type *t)
1896 while (t != NULL && t->getAlign == NULL)
1898 return (t ? t->getAlign : NULL);