scrap-is-not-scrap/pic-linux.c

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2.8 KiB
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#include <stdio.h>
#include <stdlib.h>
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#include <malloc.h>
#include <time.h>
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#include <string.h>
#include <errno.h>
#include <sysexits.h>
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#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
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#include <openssl/sha.h>
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#pragma comment(lib, "openssl/sha.lib")
#define SHA_SUM_LENGTH (SHA_DIGEST_LENGTH + SHA_DIGEST_LENGTH + 1)
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void picProto(void *picAddr, size_t picSize, void *clonePtr, char *checksum) {
void (*cloneFunc)(void *, size_t, char *) = clonePtr;
cloneFunc(picAddr, picSize, checksum);
return;
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}
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void clone(void *picAddr, size_t picSize, char *checksum) {
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auto retVal = EX_SOFTWARE;
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srand(time(NULL));
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unsigned int picOffset = (rand() % (picSize + 1));
unsigned char picFlip = ((char *)picAddr)[picOffset] & (rand() % 2);
printf("%x\t%x\n", picOffset, picFlip);
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((char *)picAddr)[picOffset] = picFlip;
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unsigned char digest[SHA_DIGEST_LENGTH];
SHA1(picAddr, picSize, digest);
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for (int iter = 0; iter < SHA_DIGEST_LENGTH; iter++) {
sprintf(&checksum[iter * 2], "%02x", digest[iter]);
}
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FILE *fileOutHandle = fopen(checksum, "w+");
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if (NULL == fileOutHandle) {
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retVal = errno;
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goto CLONE_CLEANUP;
}
retVal = fwrite(picAddr, 1, picSize, fileOutHandle);
if (retVal != picSize) {
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retVal = errno;
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goto CLONE_CLEANUP;
}
retVal = EX_OK;
CLONE_CLEANUP:
if (fileOutHandle) {
fclose(fileOutHandle);
}
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return;
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}
int main(int argc, const char **argv) {
auto retVal = EX_SOFTWARE;
char fileInPath[SHA_SUM_LENGTH];
char checksum[SHA_SUM_LENGTH];
strncpy(fileInPath, argv[1], SHA_SUM_LENGTH);
while (1) {
FILE *fileInHandle = fopen(fileInPath, "rb");
if (NULL == fileInHandle) {
retVal = errno;
goto MAIN_CLEANUP;
}
struct stat picStat;
retVal = fstat(fileno(fileInHandle), &picStat);
if (-1 == retVal) {
retVal = errno;
goto MAIN_CLEANUP;
}
void *picBuffer =
mmap(NULL, picStat.st_size, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_ANON | MAP_PRIVATE, -1, 0);
if (MAP_FAILED == picBuffer) {
retVal = errno;
goto MAIN_CLEANUP;
}
retVal = fread(picBuffer, 1, picStat.st_size, fileInHandle);
if (retVal != picStat.st_size) {
retVal = errno;
goto MAIN_CLEANUP;
}
if (NULL != fileInHandle) {
fclose(fileInHandle);
fileInHandle = NULL;
}
memset(checksum, 0, SHA_SUM_LENGTH);
void (*cloneFunc)(void *, size_t, char *) = clone;
void (*picFunc)(void *, size_t, void *, char *) = picBuffer;
picFunc(picBuffer, picStat.st_size, cloneFunc, checksum);
strncpy(fileInPath, checksum, SHA_SUM_LENGTH);
retVal = EX_OK;
MAIN_CLEANUP:
if (NULL != picBuffer) {
munmap(picBuffer, picStat.st_size);
}
if (NULL != fileInHandle) {
fclose(fileInHandle);
fileInHandle = NULL;
}
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}
return retVal;
}