138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/* Copyright 2017 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "config.h"
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#include <regex.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include "ccan/short_types/short_types.h"
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#include "container-utils.h"
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#include "container.h"
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extern char *progname;
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extern bool verbose, debug;
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extern int wrap;
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void hex_print(char *lead, unsigned char *buffer, size_t buflen)
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{
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unsigned int i, indent = 4;
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char prelead[100];
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const char *pad;
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int col;
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snprintf(prelead, 100, "--> %s: ", progname);
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pad = (((strlen(prelead) + strlen(lead)) % 2) == 0) ? "" : " ";
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wrap = ((wrap % 2) == 0) ? wrap : wrap - 1;
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indent = ((indent % 2) == 0) ? indent : indent - 1;
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col = fprintf(stdout, "%s%s%s", prelead, lead, pad);
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for (i = 1; i < buflen + 1; i++) {
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fprintf(stdout, "%02x", buffer[i - 1]);
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col = col + 2;
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if (((col % wrap) == 0) && (i < buflen)) {
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fprintf(stdout, "\n%*c", indent, ' ');
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col = indent;
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}
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}
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fprintf(stdout, "\n");
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}
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void verbose_print(char *lead, unsigned char *buffer, size_t buflen)
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{
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if (verbose)
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hex_print(lead, buffer, buflen);
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}
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void debug_print(char *lead, unsigned char *buffer, size_t buflen)
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{
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if (debug)
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hex_print(lead, buffer, buflen);
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}
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/**
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* Validate hexadecimal ASCII input of a given length.
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* - len is the byte len of the resulting value, not the len of the hexascii.
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* - len = 0 means validate input of arbitrary length.
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*/
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int isValidHex(char *input, int len) {
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int r;
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size_t maxlen = 512; // sane limit
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regex_t regexpr;
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char pattern[48];
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char multiplier[8];
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bool result = false;
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if ((strnlen(input, maxlen) > maxlen * 2) || (len > (int) maxlen))
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die(EX_DATAERR, "input exceeded max length: %lu", maxlen);
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if (len > 0)
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sprintf(multiplier, "{%d}", len * 2); // allow this (byte) len only
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else
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sprintf(multiplier, "+"); // unlimited
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sprintf(pattern, "^(0x|0X)?[a-fA-F0-9]%s$", multiplier);
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if ((r = regcomp(®expr, pattern, REG_EXTENDED | REG_NOSUB)))
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die(EX_SOFTWARE, "%s", "failure to compile regex");
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if (!(r = regexec(®expr, input, 0, NULL, 0)))
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result = true;
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regfree(®expr);
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return result;
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}
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/**
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* Validate ASCII input up to a given length.
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* - len is the expected len of the ascii input.
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* - len = 0 means validate input of arbitrary length.
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* - NOTE: not all ascii chars are allowed here.
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*/
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int isValidAscii(char *input, int len) {
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int r;
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size_t maxlen = 256; // sane limit
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regex_t regexpr;
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char pattern[48];
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char multiplier[8];
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bool result = false;
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if ((strnlen(input, maxlen) > maxlen) || (len > (int) maxlen))
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die(EX_DATAERR, "input exceeded max length: %lu", maxlen);
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if (len > 0)
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sprintf(multiplier, "{,%d}", len); // allow *up to* this len
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else
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sprintf(multiplier, "+"); // unlimited
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sprintf(pattern, "^[a-zA-Z0-9_+-]%s$", multiplier);
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if ((r = regcomp(®expr, pattern, REG_EXTENDED | REG_NOSUB)))
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die(EX_SOFTWARE, "%s", "failure to compile regex");
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if (!(r = regexec(®expr, input, 0, NULL, 0)))
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result = true;
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regfree(®expr);
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return result;
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}
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