mirror of https://gerrit.osmocom.org/asn1c
440 lines
11 KiB
C
440 lines
11 KiB
C
/*
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* Generic decoder template for a selected ASN.1 type.
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* Copyright (c) 2005 Lev Walkin <vlm@lionet.info>. All rights reserved.
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*
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* To compile with your own ASN.1 type, please redefine the asn_DEF as shown:
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*
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* cc -Dasn_DEF=asn_DEF_MyCustomType -o myDecoder.o -c asn-decoder-template.c
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <sys/types.h>
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#include <stdlib.h> /* for atoi(3) */
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#include <unistd.h> /* for getopt(3) */
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#include <string.h> /* for strerror(3) */
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#include <sysexits.h> /* for EX_* exit codes */
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#include <assert.h> /* for assert(3) */
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#include <errno.h> /* for errno */
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#include <asn_application.h>
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#include <asn_internal.h> /* for _ASN_DEFAULT_STACK_MAX */
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extern asn_TYPE_descriptor_t asn_DEF; /* ASN.1 type to be decoded */
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#ifdef ASN_PDU_COLLECTION /* Generated by asn1c: -pdu=... */
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extern asn_TYPE_descriptor_t *asn_pdu_collection[];
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#endif
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/*
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* Open file and parse its contens.
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*/
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static void *data_decode_from_file(asn_TYPE_descriptor_t *asnTypeOfPDU,
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const char *fname, ssize_t suggested_bufsize);
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static int write_out(const void *buffer, size_t size, void *key);
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int opt_debug; /* -d */
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static int opt_check; /* -c */
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static int opt_stack; /* -s */
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/* Input data format selector */
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static enum input_format {
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INP_BER, /* -iber: BER input */
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INP_XER, /* -ixer: XER input */
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INP_PER /* -iper: Unaligned PER input */
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} iform; /* -i<format> */
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/* Output data format selector */
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static enum output_format {
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OUT_XER, /* -oxer: XER (XML) output */
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OUT_DER, /* -oder: DER output */
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OUT_TEXT, /* -otext: semi-structured text */
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OUT_NULL /* -onull: No pretty-printing */
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} oform; /* -o<format> */
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/* Debug output function */
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static inline void
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DEBUG(const char *fmt, ...) {
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va_list ap;
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if(!opt_debug) return;
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fprintf(stderr, "AD: ");
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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fprintf(stderr, "\n");
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}
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int
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main(int ac, char **av) {
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static asn_TYPE_descriptor_t *pduType = &asn_DEF;
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ssize_t suggested_bufsize = 8192; /* close or equal to stdio buffer */
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int number_of_iterations = 1;
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int num;
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int ch;
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/* Figure out if Unaligned PER needs to be default */
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if(pduType->uper_decoder)
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iform = INP_PER;
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/*
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* Pocess the command-line argments.
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*/
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while((ch = getopt(ac, av, "i:o:b:cdn:p:hs:")) != -1)
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switch(ch) {
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case 'i':
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if(optarg[0] == 'b') { iform = INP_BER; break; }
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if(optarg[0] == 'x') { iform = INP_XER; break; }
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if(pduType->uper_decoder
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&& optarg[0] == 'p') { iform = INP_PER; break; }
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fprintf(stderr, "-i<format>: '%s': improper format selector",
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optarg);
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exit(EX_UNAVAILABLE);
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case 'o':
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if(optarg[0] == 'd') { oform = OUT_DER; break; }
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if(optarg[0] == 'x') { oform = OUT_XER; break; }
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if(optarg[0] == 't') { oform = OUT_TEXT; break; }
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if(optarg[0] == 'n') { oform = OUT_NULL; break; }
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fprintf(stderr, "-o<format>: '%s': improper format selector",
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optarg);
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exit(EX_UNAVAILABLE);
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case 'p':
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#ifdef ASN_PDU_COLLECTION
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{
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asn_TYPE_descriptor_t **pdu = asn_pdu_collection;
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if(optarg[0] < 'A' || optarg[0] > 'Z') {
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fprintf(stderr, "Available PDU types:\n");
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for(; *pdu; pdu++) printf("%s\n", (*pdu)->name);
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exit(0);
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}
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while(*pdu && strcmp((*pdu)->name, optarg)) pdu++;
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if(*pdu) { pduType = *pdu; break; }
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}
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#endif /* ASN_PDU_COLLECTION */
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fprintf(stderr, "-p %s: Unrecognized PDU\n", optarg);
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exit(EX_UNAVAILABLE);
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case 'b':
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suggested_bufsize = atoi(optarg);
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if(suggested_bufsize < 1
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|| suggested_bufsize > 16 * 1024 * 1024) {
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fprintf(stderr,
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"-b %s: Improper buffer size (1..16M)\n",
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optarg);
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exit(EX_UNAVAILABLE);
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}
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break;
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case 'c':
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opt_check = 1;
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break;
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case 'd':
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opt_debug++; /* Double -dd means ASN.1 debug */
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break;
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case 'n':
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number_of_iterations = atoi(optarg);
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if(number_of_iterations < 1) {
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fprintf(stderr,
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"-n %s: Improper iterations count\n", optarg);
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exit(EX_UNAVAILABLE);
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}
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break;
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case 's':
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opt_stack = atoi(optarg);
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if(opt_stack < 0) {
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fprintf(stderr,
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"-s %s: Non-negative value expected\n",
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optarg);
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exit(EX_UNAVAILABLE);
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}
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break;
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case 'h':
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default:
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fprintf(stderr, "Usage: %s [options] <data.ber> ...\n", av[0]);
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fprintf(stderr, "Where options are:\n");
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if(pduType->uper_decoder)
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fprintf(stderr,
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" -iper (I) Input is in Unaligned PER (Packed Encoding Rules)\n");
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fprintf(stderr,
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" -iber %s Input is in BER (Basic Encoding Rules)\n",
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iform == INP_PER ? " " : "(I)");
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fprintf(stderr,
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" -ixer Input is in XER (XML Encoding Rules)\n"
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" -oder Output in DER (Distinguished Encoding Rules)\n"
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" -oxer (O) Output in XER (XML Encoding Rules)\n"
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" -otext Output in plain semi-structured text (dump)\n"
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" -onull Verify (decode) input, but do not output\n");
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#ifdef ASN_PDU_COLLECTION
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fprintf(stderr,
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" -p <PDU> Specify PDU type to decode\n"
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" -p list List available PDUs\n");
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#endif /* ASN_PDU_COLLECTION */
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fprintf(stderr,
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" -b <size> Set the i/o buffer size (default is %ld)\n"
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" -c Check ASN.1 constraints after decoding\n"
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" -d Enable debugging (-dd is even better)\n"
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" -n <num> Process files <num> times\n"
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" -s <size> Set the stack usage limit (default is %d)\n"
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, (long)suggested_bufsize, _ASN_DEFAULT_STACK_MAX);
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exit(EX_USAGE);
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}
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ac -= optind;
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av += optind;
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if(ac < 1) {
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fprintf(stderr, "%s: No input files specified. "
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"Try '-h' for more information\n",
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av[-optind]);
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exit(EX_USAGE);
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}
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setvbuf(stdout, 0, _IOLBF, 0);
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for(num = 0; num < number_of_iterations; num++) {
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int ac_i;
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/*
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* Process all files in turn.
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*/
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for(ac_i = 0; ac_i < ac; ac_i++) {
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char *fname = av[ac_i];
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void *structure;
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asn_enc_rval_t erv;
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/*
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* Decode the encoded structure from file.
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*/
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structure = data_decode_from_file(pduType,
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fname, suggested_bufsize);
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if(!structure) {
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/* Error message is already printed */
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exit(EX_DATAERR);
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}
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/* Check ASN.1 constraints */
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if(opt_check) {
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char errbuf[128];
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size_t errlen = sizeof(errbuf);
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if(asn_check_constraints(pduType, structure,
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errbuf, &errlen)) {
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fprintf(stderr, "%s: ASN.1 constraint "
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"check failed: %s\n", fname, errbuf);
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exit(EX_DATAERR);
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}
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}
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switch(oform) {
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case OUT_NULL:
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fprintf(stderr, "%s: decoded successfully\n", fname);
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break;
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case OUT_TEXT: /* -otext */
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asn_fprint(stdout, pduType, structure);
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break;
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case OUT_XER: /* -oxer */
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if(xer_fprint(stdout, pduType, structure)) {
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fprintf(stderr, "%s: Cannot convert into XML\n",
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fname);
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exit(EX_UNAVAILABLE);
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}
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break;
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case OUT_DER:
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erv = der_encode(pduType, structure, write_out, stdout);
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if(erv.encoded < 0) {
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fprintf(stderr, "%s: Cannot convert into DER\n",
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fname);
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exit(EX_UNAVAILABLE);
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}
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break;
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}
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pduType->free_struct(pduType, structure, 0);
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}
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}
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return 0;
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}
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/* Dump the buffer */
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static int write_out(const void *buffer, size_t size, void *key) {
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FILE *fp = (FILE *)key;
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return (fwrite(buffer, 1, size, fp) == size) ? 0 : -1;
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}
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static char *buffer;
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static size_t buf_len; /* Length of meaningful contents */
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static size_t buf_size; /* Allocated memory */
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static size_t buf_offset; /* Offset from the start */
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static off_t buf_shifted; /* Number of bytes ever shifted */
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static int buf_nreallocs; /* Number of reallocations */
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#define bufptr (buffer + buf_offset)
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#define bufend (buffer + buf_offset + buf_len)
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/*
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* Ensure that the buffer contains at least this amount of free space.
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*/
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static void buf_extend(const void *data2add, size_t bySize) {
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DEBUG("buf_extend(%ld) { o=%ld l=%ld s=%ld }",
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(long)bySize, (long)buf_offset, (long)buf_len, (long)buf_size);
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if(buf_size >= (buf_offset + buf_len + bySize)) {
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/* Nothing to do */
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} else if(bySize <= buf_offset) {
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DEBUG("\tContents shifted by %ld", (long)buf_offset);
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/* Shift the buffer contents */
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memmove(buffer, buffer + buf_offset, buf_len);
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buf_shifted += buf_offset;
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buf_offset = 0;
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} else {
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size_t newsize = (buf_size << 2) + bySize;
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void *p = malloc(newsize);
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if(!p) {
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perror("realloc()");
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exit(EX_OSERR);
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}
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memcpy(p, buffer, buf_len);
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free(buffer);
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buffer = (char *)p;
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buf_size = newsize;
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buf_offset = 0;
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DEBUG("\tBuffer reallocated to %ld, %d time",
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(long)newsize, ++buf_nreallocs);
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}
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memcpy(buffer + buf_offset + buf_len, data2add, bySize);
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buf_len += bySize;
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}
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static void *data_decode_from_file(asn_TYPE_descriptor_t *pduType, const char *fname, ssize_t suggested_bufsize) {
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static char *fbuf;
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static ssize_t fbuf_size;
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static asn_codec_ctx_t s_codec_ctx;
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asn_codec_ctx_t *opt_codec_ctx = 0;
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void *structure = 0;
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asn_dec_rval_t rval;
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size_t rd;
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FILE *fp;
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if(opt_stack) {
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s_codec_ctx.max_stack_size = opt_stack;
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opt_codec_ctx = &s_codec_ctx;
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}
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if(strcmp(fname, "-")) {
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DEBUG("Processing file %s", fname);
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fp = fopen(fname, "r");
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} else {
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DEBUG("Processing %s", "standard input");
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fname = "stdin";
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fp = stdin;
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}
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if(!fp) {
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fprintf(stderr, "%s: %s\n", fname, strerror(errno));
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return 0;
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}
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/* prepare the file buffer */
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if(fbuf_size != suggested_bufsize) {
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fbuf = (char *)realloc(fbuf, suggested_bufsize);
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if(!fbuf) {
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perror("realloc()");
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exit(EX_OSERR);
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}
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fbuf_size = suggested_bufsize;
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}
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buf_nreallocs = 0;
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buf_shifted = 0;
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buf_offset = 0;
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buf_size = 0;
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buf_len = 0;
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/* Pretend immediate EOF */
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rval.code = RC_WMORE;
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rval.consumed = 0;
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while((rd = fread(fbuf, 1, fbuf_size, fp)) || !feof(fp)) {
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char *i_bptr;
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size_t i_size;
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/*
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* Copy the data over, or use the original buffer.
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*/
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if(buf_size) {
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/* Append the new data into the intermediate buffer */
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buf_extend(fbuf, rd);
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i_bptr = bufptr;
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i_size = buf_len;
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} else {
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i_bptr = fbuf;
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i_size = rd;
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}
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switch(iform) {
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case INP_BER:
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rval = ber_decode(opt_codec_ctx, pduType,
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(void **)&structure, i_bptr, i_size);
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break;
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case INP_XER:
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rval = xer_decode(opt_codec_ctx, pduType,
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(void **)&structure, i_bptr, i_size);
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break;
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case INP_PER:
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rval = uper_decode(opt_codec_ctx, pduType,
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(void **)&structure, i_bptr, i_size);
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break;
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}
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DEBUG("decode(%ld) consumed %ld (%ld), code %d",
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(long)buf_len, (long)rval.consumed, (long)i_size,
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rval.code);
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if(buf_size == 0) {
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/*
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* Switch the remainder into the intermediate buffer.
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*/
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if(rval.code != RC_FAIL && rval.consumed < rd) {
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buf_extend(fbuf + rval.consumed,
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rd - rval.consumed);
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rval.consumed = 0;
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}
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}
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switch(rval.code) {
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case RC_OK:
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DEBUG("RC_OK, finishing up with %ld",
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(long)rval.consumed);
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if(fp != stdin) fclose(fp);
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return structure;
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case RC_WMORE:
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DEBUG("RC_WMORE, continuing %ld with %ld..%ld..%ld",
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(long)rval.consumed, (long)buf_offset,
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(long)buf_len, (long)buf_size);
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/*
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* Adjust position inside the source buffer.
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*/
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buf_offset += rval.consumed;
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buf_len -= rval.consumed;
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rval.consumed = 0;
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continue;
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case RC_FAIL:
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break;
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}
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break;
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}
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fclose(fp);
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/* Clean up partially decoded structure */
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pduType->free_struct(pduType, structure, 0);
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fprintf(stderr, "%s: "
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"Decode failed past byte %ld: %s\n",
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fname, (long)(buf_shifted + buf_offset + rval.consumed),
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(rval.code == RC_WMORE)
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? "Unexpected end of input"
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: "Input processing error");
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return 0;
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}
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