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/* Copyright 2017 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#include "container.h"
#include <regex.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
extern char *progname;
extern bool verbose, debug;
extern int wrap;
int close_fds();
#define die(status, msg, ...) \
{ fprintf(stderr, "error: %s.%s() line %d: " msg "\n", progname, \
__func__, __LINE__, __VA_ARGS__); close_fds(); exit(status); }
#define debug_msg(msg, ...) \
if (debug) fprintf(stderr, "--> %s.%s(): " msg "\n", progname, \
__func__, __VA_ARGS__);
#define verbose_msg(msg, ...) \
if (verbose) fprintf(stdout, "--> %s: " msg "\n", progname, \
__VA_ARGS__);
int close_fds()
{
for (int fd = 3; fd < 16; fd++) {
int fd_test = dup(fd);
if (fd_test >= 0) {
close(fd_test);
close(fd);
}
}
return 0;
}
void hex_print(char *lead, unsigned char *buffer, size_t buflen)
{
unsigned int i, indent = 4;
char prelead[100];
snprintf(prelead, 100, "--> %s: ", progname);
char *pad = (((strlen(prelead) + strlen(lead)) % 2) == 0) ? "" : " ";
wrap = ((wrap % 2) == 0) ? wrap : wrap - 1;
indent = ((indent % 2) == 0) ? indent : indent - 1;
int 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) {
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$", multiplier);
if ((regcomp(®expr, pattern, REG_EXTENDED | REG_NOSUB)))
die(EX_SOFTWARE, "%s", "failure to compile regex");
if (!(regexec(®expr, input, 0, NULL, 0)))
result = true;
regfree(®expr);
return result;
}
/**
* Validate ASCII input up to a given length.
* - len is the expected len of the ascii input.
* - len = 0 means validate input of arbitrary length.
* - NOTE: not all ascii chars are allowed here.
*/
int isValidAscii(char *input, int len) {
size_t maxlen = 256; // sane limit
regex_t regexpr;
char pattern[48];
char multiplier[8];
bool result = false;
if ((strnlen(input, maxlen) > maxlen) || (len > (int) maxlen))
die(EX_DATAERR, "input exceeded max length: %lu", maxlen);
if (len > 0)
sprintf(multiplier, "{,%d}", len); // allow *up to* this len
else
sprintf(multiplier, "+"); // unlimited
sprintf(pattern, "^[a-zA-Z0-9_+-]%s$", multiplier);
if ((regcomp(®expr, pattern, REG_EXTENDED | REG_NOSUB)))
die(EX_SOFTWARE, "%s", "failure to compile regex");
if (!(regexec(®expr, input, 0, NULL, 0)))
result = true;
regfree(®expr);
return result;
}
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