view rvinterf/ctracedec/decode.c @ 1011:6d9b10633f10

etmsync Pirelli IMEI retrieval: fix poor use of printf() Bug reported by Vadim Yanitskiy <fixeria@osmocom.org>: the construct where a static-allocated string was passed to printf() without any format arguments causes newer compilers to report a security problem. Given that formatted output is not needed here, just fixed string output, change printf() to fputs(), and direct the error message to stderr while at it.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 23 May 2024 17:29:57 +0000
parents e7502631a0f9
children
line wrap: on
line source

/*
 * This module implements the actual decoding of compressed traces.
 */

#include <sys/types.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>

extern char *str2ind_tab_filename;
extern int str2ind_array_size;
extern char **str2ind_orig_strings;
extern char **str2ind_param_strings;

#define	MAX_PRINTF_PARAMS	16

static int cindex, cindex_nchars;
static u_char param_bytes_array[256];
static int param_bytes_count;
static char *format_string, *param_type_string;
static int num_printf_params;
static u_long printf_params[MAX_PRINTF_PARAMS];
static char output_buf[2048];

decode_hex_digit(c)
{
	if (isdigit(c))
		return(c - '0');
	else if (isupper(c))
		return(c - 'A' + 10);
	else
		return(c - 'a' + 10);
}

static int
decode_idx_and_params(line)
	char *line;
{
	char *cp;
	u_char *dp;

	for (cp = line; isdigit(*cp); cp++)
		;
	if (*cp && *cp != ' ')
		return(-1);
	cindex = atoi(line);
	cindex_nchars = cp - line;
	for (dp = param_bytes_array; *cp; ) {
		if (*cp++ != ' ')
			return(-1);
		if (!isxdigit(cp[0]) || !isxdigit(cp[1]))
			return(-1);
		*dp++ = decode_hex_digit(cp[0]) << 4 | decode_hex_digit(cp[1]);
		cp += 2;
	}
	param_bytes_count = dp - param_bytes_array;
	return(0);
}

static void
decode_parameters(filename_for_errs, lineno_for_errs)
	char *filename_for_errs;
{
	int pi, type;
	u_char *bp, *endp;

	bp = param_bytes_array;
	endp = bp + param_bytes_count;
	for (pi = 0; pi < num_printf_params; pi++) {
		type = param_type_string[pi];
		switch (type) {
		case 'c':
			if (bp >= endp) {
wrong_param_byte_count:		fprintf(stderr,
	"%s line %d: wrong number of parameter bytes for %s entry #%d\n",
					filename_for_errs, lineno_for_errs,
					str2ind_tab_filename, cindex);
				exit(1);
			}
			printf_params[pi] = *bp++;
			continue;
		case 'i':
		case 'p':
		case '*':
			if (bp > endp - 4)
				goto wrong_param_byte_count;
			printf_params[pi] = (u_long) bp[0] |
					    (u_long) bp[1] << 8 |
					    (u_long) bp[2] << 16 |
					    (u_long) bp[3] << 24;
			bp += 4;
			continue;
		case 's':
			printf_params[pi] = (u_long) bp;
			for (;;) {
				if (bp >= endp) {
					fprintf(stderr,
	"%s line %d: unterminated string parameter in compressed trace\n",
						filename_for_errs,
						lineno_for_errs);
					exit(1);
				}
				if (!*bp++)
					break;
			}
			continue;
		default:
			fprintf(stderr,
			"%s entry #%d: parameter type \'%c\' not supported\n",
				str2ind_tab_filename, cindex, type);
			exit(1);
		}
	}
	if (bp != endp)
		goto wrong_param_byte_count;
}

process_ctrace_line(line, cindex_offset, filename_for_errs, lineno_for_errs)
	char *line, *filename_for_errs;
{
	if (decode_idx_and_params(line + cindex_offset) < 0) {
		fprintf(stderr,
			"%s line %d: unable to decode compressed trace line\n",
			filename_for_errs, lineno_for_errs);
		exit(1);
	}
	if (cindex >= str2ind_array_size) {
		fprintf(stderr,
			"%s line %d: index %d exceeds the range of %s\n",
			filename_for_errs, lineno_for_errs, cindex,
			str2ind_tab_filename);
		exit(1);
	}
	format_string = str2ind_orig_strings[cindex];
	param_type_string = str2ind_param_strings[cindex];
	num_printf_params = strlen(param_type_string);
	if (num_printf_params > MAX_PRINTF_PARAMS) {
		fprintf(stderr,
			"error: entry #%d in %s has too many parameters\n",
			cindex, str2ind_tab_filename);
		exit(1);
	}
	decode_parameters(filename_for_errs, lineno_for_errs);
	ind2str_doprnt(format_string, printf_params, output_buf);
	printf("%.*s \"%s\"\n", cindex_offset + cindex_nchars, line,
		output_buf);
	return(0);
}