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// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
/* Copyright 2017 IBM Corp. */
#include "config.h"
#include <regex.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include "ccan/short_types/short_types.h"
#include "container-utils.h"
#include "container.h"
extern char *progname;
extern bool verbose, debug;
extern int wrap;
void hex_print(char *lead, unsigned char *buffer, size_t buflen)
{
unsigned int i, indent = 4;
char prelead[100];
const char *pad;
int col;
snprintf(prelead, 100, "--> %s: ", progname);
pad = (((strlen(prelead) + strlen(lead)) % 2) == 0) ? "" : " ";
wrap = ((wrap % 2) == 0) ? wrap : wrap - 1;
indent = ((indent % 2) == 0) ? indent : indent - 1;
col = fprintf(stdout, "%s%s%s", prelead, lead, pad);
for (i = 1; i < buflen + 1; i++) {
fprintf(stdout, "%02x", buffer[i - 1]);
col = col + 2;
if (((col % wrap) == 0) && (i < buflen)) {
fprintf(stdout, "\n%*c", indent, ' ');
col = indent;
}
}
fprintf(stdout, "\n");
}
void verbose_print(char *lead, unsigned char *buffer, size_t buflen)
{
if (verbose)
hex_print(lead, buffer, buflen);
}
void debug_print(char *lead, unsigned char *buffer, size_t buflen)
{
if (debug)
hex_print(lead, buffer, buflen);
}
/**
* Validate hexadecimal ASCII input of a given length.
* - len is the byte len of the resulting value, not the len of the hexascii.
* - len = 0 means validate input of arbitrary length.
*/
int isValidHex(char *input, int len) {
int r;
size_t maxlen = 512; // sane limit
regex_t regexpr;
char pattern[48];
char multiplier[8];
bool result = false;
if ((strnlen(input, maxlen) > maxlen * 2) || (len > (int) maxlen))
die(EX_DATAERR, "input exceeded max length: %lu", maxlen);
if (len > 0)
sprintf(multiplier, "{%d}", len * 2); // allow this (byte) len only
else
sprintf(multiplier, "+"); // unlimited
sprintf(pattern, "^(0x|0X)?[a-fA-F0-9]%s$", multiplier);
if ((r = regcomp(®expr, pattern, REG_EXTENDED | REG_NOSUB)))
die(EX_SOFTWARE, "%s", "failure to compile regex");
if (!(r = regexec(®expr, input, 0, NULL, 0)))
result = true;
regfree(®expr);
return result;
}
/**
* Validate ASCII input up to a given length.
* - len is the expected len of the ascii input.
* - len = 0 means validate input of arbitrary length.
* - NOTE: not all ascii chars are allowed here.
*/
int isValidAscii(char *input, int len) {
int r;
size_t maxlen = 256; // sane limit
regex_t regexpr;
char pattern[48];
char multiplier[8];
bool result = false;
if ((strnlen(input, maxlen) > maxlen) || (len > (int) maxlen))
die(EX_DATAERR, "input exceeded max length: %lu", maxlen);
if (len > 0)
sprintf(multiplier, "{,%d}", len); // allow *up to* this len
else
sprintf(multiplier, "+"); // unlimited
sprintf(pattern, "^[a-zA-Z0-9_+-]%s$", multiplier);
if ((r = regcomp(®expr, pattern, REG_EXTENDED | REG_NOSUB)))
die(EX_SOFTWARE, "%s", "failure to compile regex");
if (!(r = regexec(®expr, input, 0, NULL, 0)))
result = true;
regfree(®expr);
return result;
}
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