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author | markm <markm@FreeBSD.org> | 2000-01-09 20:58:00 +0000 |
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committer | markm <markm@FreeBSD.org> | 2000-01-09 20:58:00 +0000 |
commit | 4ecbd6db44d79348bc815f31096e53104f50838b (patch) | |
tree | 36fa73706fa0587a390c45a3fbf17c9523cb0e35 /crypto/heimdal/lib/asn1/gen_decode.c | |
download | FreeBSD-src-4ecbd6db44d79348bc815f31096e53104f50838b.zip FreeBSD-src-4ecbd6db44d79348bc815f31096e53104f50838b.tar.gz |
Import KTH Heimdal, which will be the core of our Kerberos5.
Userland to follow.
Diffstat (limited to 'crypto/heimdal/lib/asn1/gen_decode.c')
-rw-r--r-- | crypto/heimdal/lib/asn1/gen_decode.c | 375 |
1 files changed, 375 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/asn1/gen_decode.c b/crypto/heimdal/lib/asn1/gen_decode.c new file mode 100644 index 0000000..078ac44 --- /dev/null +++ b/crypto/heimdal/lib/asn1/gen_decode.c @@ -0,0 +1,375 @@ +/* + * Copyright (c) 1997 - 1999 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON 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 ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "gen_locl.h" + +RCSID("$Id: gen_decode.c,v 1.11 1999/12/02 17:05:02 joda Exp $"); + +static void +decode_primitive (const char *typename, const char *name) +{ + fprintf (codefile, + "e = decode_%s(p, len, %s, &l);\n" + "FORW;\n", + typename, + name); +} + +static void +decode_type (const char *name, const Type *t) +{ + switch (t->type) { + case TType: +#if 0 + decode_type (name, t->symbol->type); +#endif + fprintf (codefile, + "e = decode_%s(p, len, %s, &l);\n" + "FORW;\n", + t->symbol->gen_name, name); + break; + case TInteger: + decode_primitive ("integer", name); + break; + case TOctetString: + decode_primitive ("octet_string", name); + break; + case TBitString: { + Member *m; + int tag = -1; + int pos; + + fprintf (codefile, + "e = der_match_tag_and_length (p, len, UNIV, PRIM, UT_BitString," + "&reallen, &l);\n" + "FORW;\n" + "if(len < reallen)\n" + "return ASN1_OVERRUN;\n" + "p++;\n" + "len--;\n" + "reallen--;\n" + "ret++;\n"); + pos = 0; + for (m = t->members; m && tag != m->val; m = m->next) { + while (m->val / 8 > pos / 8) { + fprintf (codefile, + "p++; len--; reallen--; ret++;\n"); + pos += 8; + } + fprintf (codefile, + "%s->%s = (*p >> %d) & 1;\n", + name, m->gen_name, 7 - m->val % 8); + if (tag == -1) + tag = m->val; + } + fprintf (codefile, + "p += reallen; len -= reallen; ret += reallen;\n"); + break; + } + case TSequence: { + Member *m; + int tag = -1; + + if (t->members == NULL) + break; + + fprintf (codefile, + "e = der_match_tag_and_length (p, len, UNIV, CONS, UT_Sequence," + "&reallen, &l);\n" + "FORW;\n" + "{\n" + "int dce_fix;\n" + "if((dce_fix = fix_dce(reallen, &len)) < 0)\n" + "return ASN1_BAD_FORMAT;\n"); + + for (m = t->members; m && tag != m->val; m = m->next) { + char *s; + + asprintf (&s, "%s(%s)->%s", m->optional ? "" : "&", name, m->gen_name); + if (0 && m->type->type == TType){ + if(m->optional) + fprintf (codefile, + "%s = malloc(sizeof(*%s));\n", s, s); + fprintf (codefile, + "e = decode_seq_%s(p, len, %d, %d, %s, &l);\n", + m->type->symbol->gen_name, + m->val, + m->optional, + s); + if(m->optional) + fprintf (codefile, + "if (e == ASN1_MISSING_FIELD) {\n" + "free(%s);\n" + "%s = NULL;\n" + "e = l = 0;\n" + "}\n", + s, s); + + fprintf (codefile, "FORW;\n"); + + }else{ + fprintf (codefile, "{\n" + "size_t newlen, oldlen;\n\n" + "e = der_match_tag (p, len, CONTEXT, CONS, %d, &l);\n", + m->val); + fprintf (codefile, + "if (e)\n"); + if(m->optional) + /* XXX should look at e */ + fprintf (codefile, + "%s = NULL;\n", s); + else + fprintf (codefile, + "return e;\n"); + fprintf (codefile, + "else {\n"); + fprintf (codefile, + "p += l;\n" + "len -= l;\n" + "ret += l;\n" + "e = der_get_length (p, len, &newlen, &l);\n" + "FORW;\n" + "{\n" + + "int dce_fix;\n" + "oldlen = len;\n" + "if((dce_fix = fix_dce(newlen, &len)) < 0)" + "return ASN1_BAD_FORMAT;\n"); + if (m->optional) + fprintf (codefile, + "%s = malloc(sizeof(*%s));\n", + s, s); + decode_type (s, m->type); + fprintf (codefile, + "if(dce_fix){\n" + "e = der_match_tag_and_length (p, len, " + "(Der_class)0, (Der_type)0, 0, &reallen, &l);\n" + "FORW;\n" + "}else \n" + "len = oldlen - newlen;\n" + "}\n" + "}\n"); + fprintf (codefile, + "}\n"); + } + if (tag == -1) + tag = m->val; + free (s); + } + fprintf(codefile, + "if(dce_fix){\n" + "e = der_match_tag_and_length (p, len, " + "(Der_class)0, (Der_type)0, 0, &reallen, &l);\n" + "FORW;\n" + "}\n" + "}\n"); + + break; + } + case TSequenceOf: { + char *n; + + fprintf (codefile, + "e = der_match_tag_and_length (p, len, UNIV, CONS, UT_Sequence," + "&reallen, &l);\n" + "FORW;\n" + "if(len < reallen)\n" + "return ASN1_OVERRUN;\n" + "len = reallen;\n"); + + fprintf (codefile, + "{\n" + "size_t origlen = len;\n" + "int oldret = ret;\n" + "ret = 0;\n" + "(%s)->len = 0;\n" + "(%s)->val = NULL;\n" + "while(ret < origlen) {\n" + "(%s)->len++;\n" + "(%s)->val = realloc((%s)->val, sizeof(*((%s)->val)) * (%s)->len);\n", + name, name, name, name, name, name, name); + asprintf (&n, "&(%s)->val[(%s)->len-1]", name, name); + decode_type (n, t->subtype); + fprintf (codefile, + "len = origlen - ret;\n" + "}\n" + "ret += oldret;\n" + "}\n"); + free (n); + break; + } + case TGeneralizedTime: + decode_primitive ("generalized_time", name); + break; + case TGeneralString: + decode_primitive ("general_string", name); + break; + case TApplication: + fprintf (codefile, + "e = der_match_tag_and_length (p, len, APPL, CONS, %d, " + "&reallen, &l);\n" + "FORW;\n" + "{\n" + "int dce_fix;\n" + "if((dce_fix = fix_dce(reallen, &len)) < 0)\n" + "return ASN1_BAD_FORMAT;\n", + t->application); + decode_type (name, t->subtype); + fprintf(codefile, + "if(dce_fix){\n" + "e = der_match_tag_and_length (p, len, " + "(Der_class)0, (Der_type)0, 0, &reallen, &l);\n" + "FORW;\n" + "}\n" + "}\n"); + + break; + default : + abort (); + } +} + +void +generate_type_decode (const Symbol *s) +{ + fprintf (headerfile, + "int " + "decode_%s(const unsigned char *, size_t, %s *, size_t *);\n", + s->gen_name, s->gen_name); + + fprintf (codefile, "#define FORW " + "if(e) return e; " + "p += l; " + "len -= l; " + "ret += l\n\n"); + + + fprintf (codefile, "int\n" + "decode_%s(const unsigned char *p," + " size_t len, %s *data, size_t *size)\n" + "{\n", + s->gen_name, s->gen_name); + + switch (s->type->type) { + case TInteger: + fprintf (codefile, "return decode_integer (p, len, data, size);\n"); + break; + case TOctetString: + fprintf (codefile, "return decode_octet_string (p, len, data, size);\n"); + break; + case TGeneralizedTime: + fprintf (codefile, "return decode_generalized_time (p, len, data, size);\n"); + break; + case TGeneralString: + fprintf (codefile, "return decode_general_string (p, len, data, size);\n"); + break; + case TBitString: + case TSequence: + case TSequenceOf: + case TApplication: + case TType: + fprintf (codefile, + "size_t ret = 0, reallen;\n" + "size_t l;\n" + "int i, e;\n\n"); + fprintf(codefile, "i = 0;\n"); /* hack to avoid `unused variable' */ + + decode_type ("data", s->type); + fprintf (codefile, + "if(size) *size = ret;\n" + "return 0;\n"); + break; + default: + abort (); + } + fprintf (codefile, "}\n\n"); +} + +void +generate_seq_type_decode (const Symbol *s) +{ + fprintf (headerfile, + "int decode_seq_%s(const unsigned char *, size_t, int, int, " + "%s *, size_t *);\n", + s->gen_name, s->gen_name); + + fprintf (codefile, "int\n" + "decode_seq_%s(const unsigned char *p, size_t len, int tag, " + "int optional, %s *data, size_t *size)\n" + "{\n", + s->gen_name, s->gen_name); + + fprintf (codefile, + "size_t newlen, oldlen;\n" + "size_t l, ret = 0;\n" + "int e;\n" + "int dce_fix;\n"); + + fprintf (codefile, + "e = der_match_tag(p, len, CONTEXT, CONS, tag, &l);\n" + "if (e)\n" + "return e;\n"); + fprintf (codefile, + "p += l;\n" + "len -= l;\n" + "ret += l;\n" + "e = der_get_length(p, len, &newlen, &l);\n" + "if (e)\n" + "return e;\n" + "p += l;\n" + "len -= l;\n" + "ret += l;\n" + "oldlen = len;\n" + "if ((dce_fix = fix_dce(newlen, &len)) < 0)\n" + "return ASN1_BAD_FORMAT;\n" + "e = decode_%s(p, len, data, &l);\n" + "if (e)\n" + "return e;\n" + "p += l;\n" + "len -= l;\n" + "ret += l;\n" + "if (dce_fix) {\n" + "size_t reallen;\n\n" + "e = der_match_tag_and_length(p, len, " + "(Der_class)0, (Der_type)0, 0, &reallen, &l);\n" + "if (e)\n" + "return e;\n" + "ret += l;\n" + "}\n", + s->gen_name); + fprintf (codefile, + "if(size) *size = ret;\n" + "return 0;\n"); + + fprintf (codefile, "}\n\n"); +} |