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/*
* Generic converter template for a selected ASN.1 type.
* Copyright (c) 2005, 2006, 2007 Lev Walkin <vlm@lionet.info>.
* All rights reserved.
*
* To compile with your own ASN.1 type, please redefine the PDU as shown:
*
* cc -DPDU=MyCustomType -o myDecoder.o -c converter-sample.c
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h> /* for atoi(3) */
#include <unistd.h> /* for getopt(3) */
#include <string.h> /* for strerror(3) */
#include <sysexits.h> /* for EX_* exit codes */
#include <errno.h> /* for errno */
#include <asn_application.h>
#include <asn_internal.h> /* for _ASN_DEFAULT_STACK_MAX */
/* Convert "Type" defined by -DPDU into "asn_DEF_Type" */
#define ASN_DEF_PDU(t) asn_DEF_ ## t
#define DEF_PDU_Type(t) ASN_DEF_PDU(t)
#define PDU_Type DEF_PDU_Type(PDU)
extern asn_TYPE_descriptor_t PDU_Type; /* ASN.1 type to be decoded */
#ifdef ASN_PDU_COLLECTION /* Generated by asn1c: -pdu=... */
extern asn_TYPE_descriptor_t *asn_pdu_collection[];
#endif
/*
* Open file and parse its contens.
*/
static void *data_decode_from_file(asn_TYPE_descriptor_t *asnTypeOfPDU,
FILE *file, const char *name, ssize_t suggested_bufsize, int first_pdu);
static int write_out(const void *buffer, size_t size, void *key);
static FILE *argument_to_file(char *av[], int idx);
static char *argument_to_name(char *av[], int idx);
int opt_debug; /* -d (or -dd) */
static int opt_check; /* -c (constraints checking) */
static int opt_stack; /* -s (maximum stack size) */
static int opt_nopad; /* -per-nopad (PER input is not padded) */
static int opt_onepdu; /* -1 (decode single PDU) */
/* Input data format selector */
static enum input_format {
INP_BER, /* -iber: BER input */
INP_XER, /* -ixer: XER input */
INP_PER /* -iper: Unaligned PER input */
} iform; /* -i<format> */
/* Output data format selector */
static enum output_format {
OUT_XER, /* -oxer: XER (XML) output */
OUT_DER, /* -oder: DER (BER) output */
OUT_PER, /* -oper: Unaligned PER output */
OUT_TEXT, /* -otext: semi-structured text */
OUT_NULL /* -onull: No pretty-printing */
} oform; /* -o<format> */
#ifdef JUNKTEST /* Enable -J <probability> */
#define JUNKOPT "J:"
static double opt_jprob; /* Junk bit probability */
static int junk_failures;
static void junk_bytes_with_probability(uint8_t *, size_t, double prob);
#else
#define JUNKOPT
#endif
/* Debug output function */
static inline void
DEBUG(const char *fmt, ...) {
va_list ap;
if(!opt_debug) return;
fprintf(stderr, "AD: ");
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
}
int
main(int ac, char *av[]) {
static asn_TYPE_descriptor_t *pduType = &PDU_Type;
ssize_t suggested_bufsize = 8192; /* close or equal to stdio buffer */
int number_of_iterations = 1;
int num;
int ch;
/* Figure out if Unaligned PER needs to be default */
if(pduType->uper_decoder)
iform = INP_PER;
/*
* Pocess the command-line argments.
*/
while((ch = getopt(ac, av, "i:o:1b:cdn:p:hs:" JUNKOPT)) != -1)
switch(ch) {
case 'i':
if(optarg[0] == 'b') { iform = INP_BER; break; }
if(optarg[0] == 'x') { iform = INP_XER; break; }
if(pduType->uper_decoder
&& optarg[0] == 'p') { iform = INP_PER; break; }
fprintf(stderr, "-i<format>: '%s': improper format selector\n",
optarg);
exit(EX_UNAVAILABLE);
case 'o':
if(optarg[0] == 'd') { oform = OUT_DER; break; }
if(pduType->uper_encoder
&& optarg[0] == 'p') { oform = OUT_PER; break; }
if(optarg[0] == 'x') { oform = OUT_XER; break; }
if(optarg[0] == 't') { oform = OUT_TEXT; break; }
if(optarg[0] == 'n') { oform = OUT_NULL; break; }
fprintf(stderr, "-o<format>: '%s': improper format selector\n",
optarg);
exit(EX_UNAVAILABLE);
case '1':
opt_onepdu = 1;
break;
case 'b':
suggested_bufsize = atoi(optarg);
if(suggested_bufsize < 1
|| suggested_bufsize > 16 * 1024 * 1024) {
fprintf(stderr,
"-b %s: Improper buffer size (1..16M)\n",
optarg);
exit(EX_UNAVAILABLE);
}
break;
case 'c':
opt_check = 1;
break;
case 'd':
opt_debug++; /* Double -dd means ASN.1 debug */
break;
case 'n':
number_of_iterations = atoi(optarg);
if(number_of_iterations < 1) {
fprintf(stderr,
"-n %s: Improper iterations count\n", optarg);
exit(EX_UNAVAILABLE);
}
break;
case 'p':
if(strcmp(optarg, "er-nopad") == 0) {
opt_nopad = 1;
break;
}
#ifdef ASN_PDU_COLLECTION
if(strcmp(optarg, "list") == 0) {
asn_TYPE_descriptor_t **pdu = asn_pdu_collection;
fprintf(stderr, "Available PDU types:\n");
for(; *pdu; pdu++) printf("%s\n", (*pdu)->name);
exit(0);
} else if(optarg[0] >= 'A' && optarg[0] <= 'Z') {
asn_TYPE_descriptor_t **pdu = asn_pdu_collection;
while(*pdu && strcmp((*pdu)->name, optarg)) pdu++;
if(*pdu) { pduType = *pdu; break; }
fprintf(stderr, "-p %s: Unrecognized PDU\n", optarg);
}
#endif /* ASN_PDU_COLLECTION */
fprintf(stderr, "-p %s: Unrecognized option\n", optarg);
exit(EX_UNAVAILABLE);
case 's':
opt_stack = atoi(optarg);
if(opt_stack < 0) {
fprintf(stderr,
"-s %s: Non-negative value expected\n",
optarg);
exit(EX_UNAVAILABLE);
}
break;
#ifdef JUNKTEST
case 'J':
opt_jprob = strtod(optarg, 0);
if(opt_jprob <= 0.0 || opt_jprob > 1.0) {
fprintf(stderr,
"-J %s: Probability range 0..1 expected \n",
optarg);
exit(EX_UNAVAILABLE);
}
break;
#endif /* JUNKTEST */
case 'h':
default:
#ifdef ASN_CONVERTER_TITLE
#define _AXS(x) #x
#define _ASX(x) _AXS(x)
fprintf(stderr, "%s\n", _ASX(ASN_CONVERTER_TITLE));
#endif
fprintf(stderr, "Usage: %s [options] <data.ber> ...\n", av[0]);
fprintf(stderr, "Where options are:\n");
if(pduType->uper_decoder)
fprintf(stderr,
" -iper Input is in Unaligned PER (Packed Encoding Rules) (DEFAULT)\n");
fprintf(stderr,
" -iber Input is in BER (Basic Encoding Rules)%s\n",
iform == INP_PER ? "" : " (DEFAULT)");
fprintf(stderr,
" -ixer Input is in XER (XML Encoding Rules)\n");
if(pduType->uper_encoder)
fprintf(stderr,
" -oper Output in Unaligned PER (Packed Encoding Rules)\n");
fprintf(stderr,
" -oder Output in DER (Distinguished Encoding Rules)\n"
" -oxer Output in XER (XML Encoding Rules) (DEFAULT)\n"
" -otext Output in plain semi-structured text (dump)\n"
" -onull Verify (decode) input, but do not output\n");
if(pduType->uper_decoder)
fprintf(stderr,
" -per-nopad Assume PER PDUs are not padded (-iper)\n");
#ifdef ASN_PDU_COLLECTION
fprintf(stderr,
" -p <PDU> Specify PDU type to decode\n"
" -p list List available PDUs\n");
#endif /* ASN_PDU_COLLECTION */
fprintf(stderr,
" -1 Decode only the first PDU in file\n"
" -b <size> Set the i/o buffer size (default is %ld)\n"
" -c Check ASN.1 constraints after decoding\n"
" -d Enable debugging (-dd is even better)\n"
" -n <num> Process files <num> times\n"
" -s <size> Set the stack usage limit (default is %d)\n"
#ifdef JUNKTEST
" -J <prob> Set random junk test bit garbaging probability\n"
#endif
, (long)suggested_bufsize, _ASN_DEFAULT_STACK_MAX);
exit(EX_USAGE);
}
ac -= optind;
av += optind;
if(ac < 1) {
fprintf(stderr, "%s: No input files specified. "
"Try '-h' for more information\n",
av[-optind]);
exit(EX_USAGE);
}
setvbuf(stdout, 0, _IOLBF, 0);
for(num = 0; num < number_of_iterations; num++) {
int ac_i;
/*
* Process all files in turn.
*/
for(ac_i = 0; ac_i < ac; ac_i++) {
asn_enc_rval_t erv;
void *structure; /* Decoded structure */
FILE *file = argument_to_file(av, ac_i);
char *name = argument_to_name(av, ac_i);
int first_pdu;
for(first_pdu = 1; first_pdu || !opt_onepdu; first_pdu = 0) {
/*
* Decode the encoded structure from file.
*/
structure = data_decode_from_file(pduType,
file, name, suggested_bufsize, first_pdu);
if(!structure) {
if(errno) {
/* Error message is already printed */
exit(EX_DATAERR);
} else {
/* EOF */
break;
}
}
/* Check ASN.1 constraints */
if(opt_check) {
char errbuf[128];
size_t errlen = sizeof(errbuf);
if(asn_check_constraints(pduType, structure,
errbuf, &errlen)) {
fprintf(stderr, "%s: ASN.1 constraint "
"check failed: %s\n", name, errbuf);
exit(EX_DATAERR);
}
}
switch(oform) {
case OUT_NULL:
#ifdef JUNKTEST
if(opt_jprob == 0.0)
#endif
fprintf(stderr, "%s: decoded successfully\n", name);
break;
case OUT_TEXT: /* -otext */
asn_fprint(stdout, pduType, structure);
break;
case OUT_XER: /* -oxer */
if(xer_fprint(stdout, pduType, structure)) {
fprintf(stderr,
"%s: Cannot convert %s into XML\n",
name, pduType->name);
exit(EX_UNAVAILABLE);
}
break;
case OUT_DER:
erv = der_encode(pduType, structure, write_out, stdout);
if(erv.encoded < 0) {
fprintf(stderr,
"%s: Cannot convert %s into DER\n",
name, pduType->name);
exit(EX_UNAVAILABLE);
}
DEBUG("Encoded in %ld bytes of DER", (long)erv.encoded);
break;
case OUT_PER:
erv = uper_encode(pduType, structure, write_out, stdout);
if(erv.encoded < 0) {
fprintf(stderr,
"%s: Cannot convert %s into Unaligned PER\n",
name, pduType->name);
exit(EX_UNAVAILABLE);
}
DEBUG("Encoded in %ld bits of UPER", (long)erv.encoded);
break;
}
ASN_STRUCT_FREE(*pduType, structure);
}
if(file && file != stdin)
fclose(file);
}
}
#ifdef JUNKTEST
if(opt_jprob > 0.0) {
fprintf(stderr, "Junked %f OK (%d/%d)\n",
opt_jprob, junk_failures, number_of_iterations);
}
#endif /* JUNKTEST */
return 0;
}
static struct dynamic_buffer {
uint8_t *data; /* Pointer to the data bytes */
size_t offset; /* Offset from the start */
size_t length; /* Length of meaningful contents */
size_t unbits; /* Unused bits in the last byte */
size_t allocated; /* Allocated memory for data */
int nreallocs; /* Number of data reallocations */
off_t bytes_shifted; /* Number of bytes ever shifted */
} DynamicBuffer;
static void
buffer_dump() {
uint8_t *p = DynamicBuffer.data + DynamicBuffer.offset;
uint8_t *e = p + DynamicBuffer.length - (DynamicBuffer.unbits ? 1 : 0);
if(!opt_debug) return;
DEBUG("Buffer: { d=%p, o=%ld, l=%ld, u=%ld, a=%ld, s=%ld }",
DynamicBuffer.data,
(long)DynamicBuffer.offset,
(long)DynamicBuffer.length,
(long)DynamicBuffer.unbits,
(long)DynamicBuffer.allocated,
(long)DynamicBuffer.bytes_shifted);
for(; p < e; p++) {
fprintf(stderr, " %c%c%c%c%c%c%c%c",
((*p >> 7) & 1) ? '1' : '0',
((*p >> 6) & 1) ? '1' : '0',
((*p >> 5) & 1) ? '1' : '0',
((*p >> 4) & 1) ? '1' : '0',
((*p >> 3) & 1) ? '1' : '0',
((*p >> 2) & 1) ? '1' : '0',
((*p >> 1) & 1) ? '1' : '0',
((*p >> 0) & 1) ? '1' : '0');
}
if(DynamicBuffer.unbits) {
unsigned int shift;
fprintf(stderr, " ");
for(shift = 7; shift >= DynamicBuffer.unbits; shift--)
fprintf(stderr, "%c", ((*p >> shift) & 1) ? '1' : '0');
fprintf(stderr, " %ld:%ld\n",
(long)DynamicBuffer.length - 1,
(long)8 - DynamicBuffer.unbits);
} else {
fprintf(stderr, " %d\n", DynamicBuffer.length);
}
}
/*
* Move the buffer content left N bits, possibly joining it with
* preceeding content.
*/
static void
buffer_shift_left(size_t offset, int bits) {
uint8_t *ptr = DynamicBuffer.data + DynamicBuffer.offset + offset;
uint8_t *end = DynamicBuffer.data + DynamicBuffer.offset
+ DynamicBuffer.length - 1;
if(!bits) return;
DEBUG("Shifting left %d bits off %ld (o=%ld, u=%ld, l=%ld)",
bits, (long)offset,
(long)DynamicBuffer.offset,
(long)DynamicBuffer.unbits,
(long)DynamicBuffer.length);
if(offset) {
int right;
right = ptr[0] >> (8 - bits);
DEBUG("oleft: %c%c%c%c%c%c%c%c",
((ptr[-1] >> 7) & 1) ? '1' : '0',
((ptr[-1] >> 6) & 1) ? '1' : '0',
((ptr[-1] >> 5) & 1) ? '1' : '0',
((ptr[-1] >> 4) & 1) ? '1' : '0',
((ptr[-1] >> 3) & 1) ? '1' : '0',
((ptr[-1] >> 2) & 1) ? '1' : '0',
((ptr[-1] >> 1) & 1) ? '1' : '0',
((ptr[-1] >> 0) & 1) ? '1' : '0');
DEBUG("oriht: %c%c%c%c%c%c%c%c",
((ptr[0] >> 7) & 1) ? '1' : '0',
((ptr[0] >> 6) & 1) ? '1' : '0',
((ptr[0] >> 5) & 1) ? '1' : '0',
((ptr[0] >> 4) & 1) ? '1' : '0',
((ptr[0] >> 3) & 1) ? '1' : '0',
((ptr[0] >> 2) & 1) ? '1' : '0',
((ptr[0] >> 1) & 1) ? '1' : '0',
((ptr[0] >> 0) & 1) ? '1' : '0');
DEBUG("mriht: %c%c%c%c%c%c%c%c",
((right >> 7) & 1) ? '1' : '0',
((right >> 6) & 1) ? '1' : '0',
((right >> 5) & 1) ? '1' : '0',
((right >> 4) & 1) ? '1' : '0',
((right >> 3) & 1) ? '1' : '0',
((right >> 2) & 1) ? '1' : '0',
((right >> 1) & 1) ? '1' : '0',
((right >> 0) & 1) ? '1' : '0');
ptr[-1] = (ptr[-1] & (0xff << bits)) | right;
DEBUG("after: %c%c%c%c%c%c%c%c",
((ptr[-1] >> 7) & 1) ? '1' : '0',
((ptr[-1] >> 6) & 1) ? '1' : '0',
((ptr[-1] >> 5) & 1) ? '1' : '0',
((ptr[-1] >> 4) & 1) ? '1' : '0',
((ptr[-1] >> 3) & 1) ? '1' : '0',
((ptr[-1] >> 2) & 1) ? '1' : '0',
((ptr[-1] >> 1) & 1) ? '1' : '0',
((ptr[-1] >> 0) & 1) ? '1' : '0');
}
buffer_dump();
for(; ptr < end; ptr++) {
int right = ptr[1] >> (8 - bits);
*ptr = (*ptr << bits) | right;
}
*ptr <<= bits;
DEBUG("Unbits [%d=>", (int)DynamicBuffer.unbits);
if(DynamicBuffer.unbits == 0) {
DynamicBuffer.unbits += bits;
} else {
DynamicBuffer.unbits += bits;
if(DynamicBuffer.unbits > 7) {
DynamicBuffer.unbits -= 8;
DynamicBuffer.length--;
DynamicBuffer.bytes_shifted++;
}
}
DEBUG("Unbits =>%d]", (int)DynamicBuffer.unbits);
buffer_dump();
DEBUG("Shifted. Now (o=%ld, u=%ld l=%ld)",
(long)DynamicBuffer.offset,
(long)DynamicBuffer.unbits,
(long)DynamicBuffer.length);
}
/*
* Ensure that the buffer contains at least this amount of free space.
*/
static void add_bytes_to_buffer(const void *data2add, size_t bytes) {
if(bytes == 0) return;
DEBUG("=> add_bytes(%ld) { o=%ld l=%ld u=%ld, s=%ld }",
(long)bytes,
(long)DynamicBuffer.offset,
(long)DynamicBuffer.length,
(long)DynamicBuffer.unbits,
(long)DynamicBuffer.allocated);
if(DynamicBuffer.allocated
>= (DynamicBuffer.offset + DynamicBuffer.length + bytes)) {
DEBUG("\tNo buffer reallocation is necessary");
} else if(bytes <= DynamicBuffer.offset) {
DEBUG("\tContents shifted by %ld", DynamicBuffer.offset);
/* Shift the buffer contents */
memmove(DynamicBuffer.data,
DynamicBuffer.data + DynamicBuffer.offset,
DynamicBuffer.length);
DynamicBuffer.bytes_shifted += DynamicBuffer.offset;
DynamicBuffer.offset = 0;
} else {
size_t newsize = (DynamicBuffer.allocated << 2) + bytes;
void *p = MALLOC(newsize);
if(!p) {
perror("malloc()");
exit(EX_OSERR);
}
memcpy(p,
DynamicBuffer.data + DynamicBuffer.offset,
DynamicBuffer.length);
FREEMEM(DynamicBuffer.data);
DynamicBuffer.data = (uint8_t *)p;
DynamicBuffer.offset = 0;
DynamicBuffer.allocated = newsize;
DynamicBuffer.nreallocs++;
DEBUG("\tBuffer reallocated to %ld (%d time)",
newsize, DynamicBuffer.nreallocs);
}
memcpy(DynamicBuffer.data
+ DynamicBuffer.offset + DynamicBuffer.length,
data2add, bytes);
DynamicBuffer.length += bytes;
if(DynamicBuffer.unbits) {
int bits = DynamicBuffer.unbits;
DynamicBuffer.unbits = 0;
buffer_shift_left(DynamicBuffer.length - bytes, bits);
}
DEBUG("<= add_bytes(%ld) { o=%ld l=%ld u=%ld, s=%ld }",
(long)bytes,
(long)DynamicBuffer.offset,
(long)DynamicBuffer.length,
(long)DynamicBuffer.unbits,
(long)DynamicBuffer.allocated);
}
static void *
data_decode_from_file(asn_TYPE_descriptor_t *pduType, FILE *file, const char *name, ssize_t suggested_bufsize, int on_first_pdu) {
static uint8_t *fbuf;
static ssize_t fbuf_size;
static asn_codec_ctx_t s_codec_ctx;
asn_codec_ctx_t *opt_codec_ctx = 0;
void *structure = 0;
asn_dec_rval_t rval;
size_t old_offset;
size_t new_offset;
int tolerate_eof;
size_t rd;
if(!file) {
fprintf(stderr, "%s: %s\n", name, strerror(errno));
errno = EINVAL;
return 0;
}
if(opt_stack) {
s_codec_ctx.max_stack_size = opt_stack;
opt_codec_ctx = &s_codec_ctx;
}
DEBUG("Processing %s", name);
/* prepare the file buffer */
if(fbuf_size != suggested_bufsize) {
fbuf = (uint8_t *)REALLOC(fbuf, suggested_bufsize);
if(!fbuf) {
perror("realloc()");
exit(EX_OSERR);
}
fbuf_size = suggested_bufsize;
}
if(on_first_pdu) {
DynamicBuffer.offset = 0;
DynamicBuffer.length = 0;
DynamicBuffer.unbits = 0;
DynamicBuffer.allocated = 0;
DynamicBuffer.bytes_shifted = 0;
DynamicBuffer.nreallocs = 0;
}
old_offset = DynamicBuffer.bytes_shifted + DynamicBuffer.offset;
/* Pretend immediate EOF */
rval.code = RC_WMORE;
rval.consumed = 0;
for(tolerate_eof = 1; /* Allow EOF first time buffer is non-empty */
(rd = fread(fbuf, 1, fbuf_size, file))
|| feof(file) == 0
|| (tolerate_eof && DynamicBuffer.length)
;) {
int ecbits = 0; /* Extra consumed bits in case of PER */
uint8_t *i_bptr;
size_t i_size;
/*
* Copy the data over, or use the original buffer.
*/
if(DynamicBuffer.allocated) {
/* Append new data into the existing dynamic buffer */
add_bytes_to_buffer(fbuf, rd);
i_bptr = DynamicBuffer.data + DynamicBuffer.offset;
i_size = DynamicBuffer.length;
} else {
i_bptr = fbuf;
i_size = rd;
}
DEBUG("Decoding %ld bytes", (long)i_size);
#ifdef JUNKTEST
junk_bytes_with_probability(i_bptr, i_size, opt_jprob);
#endif
switch(iform) {
case INP_BER:
rval = ber_decode(opt_codec_ctx, pduType,
(void **)&structure, i_bptr, i_size);
break;
case INP_XER:
rval = xer_decode(opt_codec_ctx, pduType,
(void **)&structure, i_bptr, i_size);
break;
case INP_PER:
if(opt_nopad)
rval = uper_decode(opt_codec_ctx, pduType,
(void **)&structure, i_bptr, i_size, 0,
DynamicBuffer.unbits);
else
rval = uper_decode_complete(opt_codec_ctx, pduType,
(void **)&structure, i_bptr, i_size);
switch(rval.code) {
case RC_OK:
/* Fall through */
case RC_FAIL:
if(opt_nopad) {
/* uper_decode() returns bits! */
/* Extra bits */
ecbits = rval.consumed % 8;
/* Convert into bytes! */
rval.consumed /= 8;
}
break;
case RC_WMORE:
/* PER does not support restartability */
ASN_STRUCT_FREE(*pduType, structure);
structure = 0;
rval.consumed = 0;
/* Continue accumulating data */
break;
}
break;
}
DEBUG("decode(%ld) consumed %ld+%db (%ld), code %d",
(long)DynamicBuffer.length,
(long)rval.consumed, ecbits, (long)i_size,
rval.code);
if(DynamicBuffer.allocated == 0) {
/*
* Flush remainder into the intermediate buffer.
*/
if(rval.code != RC_FAIL && rval.consumed < rd) {
add_bytes_to_buffer(fbuf + rval.consumed,
rd - rval.consumed);
buffer_shift_left(0, ecbits);
DynamicBuffer.bytes_shifted = rval.consumed;
rval.consumed = 0;
ecbits = 0;
}
}
/*
* Adjust position inside the source buffer.
*/
if(DynamicBuffer.allocated) {
DynamicBuffer.offset += rval.consumed;
DynamicBuffer.length -= rval.consumed;
} else {
DynamicBuffer.bytes_shifted += rval.consumed;
}
switch(rval.code) {
case RC_OK:
if(ecbits) buffer_shift_left(0, ecbits);
DEBUG("RC_OK, finishing up with %ld+%d",
(long)rval.consumed, ecbits);
return structure;
case RC_WMORE:
DEBUG("RC_WMORE, continuing read=%ld, cons=%ld "
" with %ld..%ld-%ld..%ld",
(long)rd,
(long)rval.consumed,
(long)DynamicBuffer.offset,
(long)DynamicBuffer.length,
(long)DynamicBuffer.unbits,
(long)DynamicBuffer.allocated);
if(!rd) tolerate_eof--;
continue;
case RC_FAIL:
break;
}
break;
}
DEBUG("Clean up partially decoded structure");
ASN_STRUCT_FREE(*pduType, structure);
new_offset = DynamicBuffer.bytes_shifted + DynamicBuffer.offset;
/*
* Print a message and return failure only if not EOF,
* unless this is our first PDU (empty file).
*/
if(on_first_pdu
|| DynamicBuffer.length
|| new_offset - old_offset > ((iform == INP_XER)?sizeof("\r\n")-1:0)
) {
#ifdef JUNKTEST
/*
* Nothing's wrong with being unable to decode junk.
* Simulate EOF.
*/
if(opt_jprob != 0.0) {
junk_failures++;
errno = 0;
return 0;
}
#endif
DEBUG("ofp %d, no=%ld, oo=%ld, dbl=%ld",
on_first_pdu, (long)new_offset, (long)old_offset,
(long)DynamicBuffer.length);
fprintf(stderr, "%s: "
"Decode failed past byte %ld: %s\n",
name, (long)new_offset,
(rval.code == RC_WMORE)
? "Unexpected end of input"
: "Input processing error");
#ifndef ENOMSG
#define ENOMSG EINVAL
#endif
#ifndef EBADMSG
#define EBADMSG EINVAL
#endif
errno = (rval.code == RC_WMORE) ? ENOMSG : EBADMSG;
} else {
/* Got EOF after a few successful PDUs */
errno = 0;
}
return 0;
}
/* Dump the buffer out to the specified FILE */
static int write_out(const void *buffer, size_t size, void *key) {
FILE *fp = (FILE *)key;
return (fwrite(buffer, 1, size, fp) == size) ? 0 : -1;
}
static int argument_is_stdin(char *av[], int idx) {
if(strcmp(av[idx], "-")) {
return 0; /* Certainly not <stdin> */
} else {
/* This might be <stdin>, unless `./program -- -` */
if(strcmp(av[-1], "--"))
return 1;
else
return 0;
}
}
static FILE *argument_to_file(char *av[], int idx) {
return argument_is_stdin(av, idx)
? stdin
: fopen(av[idx], "r");
}
static char *argument_to_name(char *av[], int idx) {
return argument_is_stdin(av, idx)
? "standard input"
: av[idx];
}
#ifdef JUNKTEST
/*
* Fill bytes with some garbage with specified probability (more or less).
*/
static void
junk_bytes_with_probability(uint8_t *buf, size_t size, double prob) {
static int junkmode;
uint8_t *ptr;
uint8_t *end;
if(opt_jprob <= 0.0) return;
for(ptr = buf, end = ptr + size; ptr < end; ptr++) {
int byte = *ptr;
if(junkmode++ & 1) {
if((((double)random() / RAND_MAX) < prob))
byte = random() & 0xff;
} else {
#define BPROB(b) ((((double)random() / RAND_MAX) < prob) ? b : 0)
byte ^= BPROB(0x80);
byte ^= BPROB(0x40);
byte ^= BPROB(0x20);
byte ^= BPROB(0x10);
byte ^= BPROB(0x08);
byte ^= BPROB(0x04);
byte ^= BPROB(0x02);
byte ^= BPROB(0x01);
}
if(byte != *ptr) {
DEBUG("Junk buf[%d] %02x -> %02x",
ptr - buf, *ptr, byte);
*ptr = byte;
}
}
}
#endif /* JUNKTEST */
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