#include "der_locl.h"
#include <com_err.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <getarg.h>
#include <err.h>
#include <der.h>
static int indent_flag = 1;
static int inner_flag = 0;
static unsigned long indefinite_form_loop;
static unsigned long indefinite_form_loop_max = 10000;
static size_t
loop (unsigned char *buf, size_t len, int indent)
{
unsigned char *start_buf = buf;
while (len > 0) {
int ret;
Der_class class;
Der_type type;
unsigned int tag;
size_t sz;
size_t length;
size_t loop_length = 0;
int end_tag = 0;
const char *tagname;
ret = der_get_tag (buf, len, &class, &type, &tag, &sz);
if (ret)
errx (1, "der_get_tag: %s", error_message (ret));
if (sz > len)
errx (1, "unreasonable length (%u) > %u",
(unsigned)sz, (unsigned)len);
buf += sz;
len -= sz;
if (indent_flag) {
int i;
for (i = 0; i < indent; ++i)
printf (" ");
}
printf ("%s %s ", der_get_class_name(class), der_get_type_name(type));
tagname = der_get_tag_name(tag);
if (class == ASN1_C_UNIV && tagname != NULL)
printf ("%s = ", tagname);
else
printf ("tag %d = ", tag);
ret = der_get_length (buf, len, &length, &sz);
if (ret)
errx (1, "der_get_tag: %s", error_message (ret));
if (sz > len)
errx (1, "unreasonable tag length (%u) > %u",
(unsigned)sz, (unsigned)len);
buf += sz;
len -= sz;
if (length == ASN1_INDEFINITE) {
if ((class == ASN1_C_UNIV && type == PRIM && tag == UT_OctetString) ||
(class == ASN1_C_CONTEXT && type == CONS) ||
(class == ASN1_C_UNIV && type == CONS && tag == UT_Sequence) ||
(class == ASN1_C_UNIV && type == CONS && tag == UT_Set)) {
printf("*INDEFINITE FORM*");
} else {
fflush(stdout);
errx(1, "indef form used on unsupported object");
}
end_tag = 1;
if (indefinite_form_loop > indefinite_form_loop_max)
errx(1, "indefinite form used recursively more then %lu "
"times, aborting", indefinite_form_loop_max);
indefinite_form_loop++;
length = len;
} else if (length > len) {
printf("\n");
fflush(stdout);
errx (1, "unreasonable inner length (%u) > %u",
(unsigned)length, (unsigned)len);
}
if (class == ASN1_C_CONTEXT || class == ASN1_C_APPL) {
printf ("%lu bytes [%u]", (unsigned long)length, tag);
if (type == CONS) {
printf("\n");
loop_length = loop (buf, length, indent + 2);
} else {
printf(" IMPLICIT content\n");
}
} else if (class == ASN1_C_UNIV) {
switch (tag) {
case UT_EndOfContent:
printf (" INDEFINITE length was %lu\n",
(unsigned long)(buf - start_buf));
break;
case UT_Set :
case UT_Sequence :
printf ("%lu bytes {\n", (unsigned long)length);
loop_length = loop (buf, length, indent + 2);
if (indent_flag) {
int i;
for (i = 0; i < indent; ++i)
printf (" ");
printf ("}\n");
} else
printf ("} indent = %d\n", indent / 2);
break;
case UT_Integer : {
int val;
if (length <= sizeof(val)) {
ret = der_get_integer (buf, length, &val, NULL);
if (ret)
errx (1, "der_get_integer: %s", error_message (ret));
printf ("integer %d\n", val);
} else {
heim_integer vali;
char *p;
ret = der_get_heim_integer(buf, length, &vali, NULL);
if (ret)
errx (1, "der_get_heim_integer: %s",
error_message (ret));
ret = der_print_hex_heim_integer(&vali, &p);
if (ret)
errx (1, "der_print_hex_heim_integer: %s",
error_message (ret));
printf ("BIG NUM integer: length %lu %s\n",
(unsigned long)length, p);
free(p);
}
break;
}
case UT_OctetString : {
heim_octet_string str;
size_t i;
ret = der_get_octet_string (buf, length, &str, NULL);
if (ret)
errx (1, "der_get_octet_string: %s", error_message (ret));
printf ("(length %lu), ", (unsigned long)length);
if (inner_flag) {
Der_class class;
Der_type type;
unsigned int tag;
ret = der_get_tag(str.data, str.length,
&class, &type, &tag, &sz);
if (ret || sz > str.length ||
type != CONS || tag != UT_Sequence)
goto just_an_octet_string;
printf("{\n");
loop (str.data, str.length, indent + 2);
for (i = 0; i < indent; ++i)
printf (" ");
printf ("}\n");
} else {
unsigned char *uc;
just_an_octet_string:
uc = (unsigned char *)str.data;
for (i = 0; i < min(16,length); ++i)
printf ("%02x", uc[i]);
printf ("\n");
}
free (str.data);
break;
}
case UT_IA5String :
case UT_PrintableString : {
heim_printable_string str;
unsigned char *s;
size_t n;
memset(&str, 0, sizeof(str));
ret = der_get_printable_string (buf, length, &str, NULL);
if (ret)
errx (1, "der_get_general_string: %s",
error_message (ret));
s = str.data;
printf("\"");
for (n = 0; n < str.length; n++) {
if (isprint((int)s[n]))
printf ("%c", s[n]);
else
printf ("#%02x", s[n]);
}
printf("\"\n");
der_free_printable_string(&str);
break;
}
case UT_GeneralizedTime :
case UT_GeneralString :
case UT_VisibleString :
case UT_UTF8String : {
heim_general_string str;
ret = der_get_general_string (buf, length, &str, NULL);
if (ret)
errx (1, "der_get_general_string: %s",
error_message (ret));
printf ("\"%s\"\n", str);
free (str);
break;
}
case UT_OID: {
heim_oid o;
char *p;
ret = der_get_oid(buf, length, &o, NULL);
if (ret)
errx (1, "der_get_oid: %s", error_message (ret));
ret = der_print_heim_oid(&o, '.', &p);
der_free_oid(&o);
if (ret)
errx (1, "der_print_heim_oid: %s", error_message (ret));
printf("%s\n", p);
free(p);
break;
}
case UT_Enumerated: {
int num;
ret = der_get_integer (buf, length, &num, NULL);
if (ret)
errx (1, "der_get_enum: %s", error_message (ret));
printf("%u\n", num);
break;
}
default :
printf ("%lu bytes\n", (unsigned long)length);
break;
}
}
if (end_tag) {
if (loop_length == 0)
errx(1, "zero length INDEFINITE data ? indent = %d\n",
indent / 2);
if (loop_length < length)
length = loop_length;
if (indefinite_form_loop == 0)
errx(1, "internal error in indefinite form loop detection");
indefinite_form_loop--;
} else if (loop_length)
errx(1, "internal error for INDEFINITE form");
buf += length;
len -= length;
}
return 0;
}
static int
doit (const char *filename)
{
int fd = open (filename, O_RDONLY);
struct stat sb;
unsigned char *buf;
size_t len;
int ret;
if(fd < 0)
err (1, "opening %s for read", filename);
if (fstat (fd, &sb) < 0)
err (1, "stat %s", filename);
len = sb.st_size;
buf = emalloc (len);
if (read (fd, buf, len) != len)
errx (1, "read failed");
close (fd);
ret = loop (buf, len, 0);
free (buf);
return ret;
}
static int version_flag;
static int help_flag;
struct getargs args[] = {
{ "indent", 0, arg_negative_flag, &indent_flag },
{ "inner", 0, arg_flag, &inner_flag, "try to parse inner structures of OCTET STRING" },
{ "version", 0, arg_flag, &version_flag },
{ "help", 0, arg_flag, &help_flag }
};
int num_args = sizeof(args) / sizeof(args[0]);
static void
usage(int code)
{
arg_printusage(args, num_args, NULL, "dump-file");
exit(code);
}
int
main(int argc, char **argv)
{
int optidx = 0;
setprogname (argv[0]);
initialize_asn1_error_table ();
if(getarg(args, num_args, argc, argv, &optidx))
usage(1);
if(help_flag)
usage(0);
if(version_flag) {
print_version(NULL);
exit(0);
}
argv += optidx;
argc -= optidx;
if (argc != 1)
usage (1);
return doit (argv[0]);
}