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85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/*
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* This is a simple program that makes a series of random modifications to an arbitrarily large specified file
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* designed as part of a test for file-ptrace and merkle tree generation and updating for hotpocket
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* Originally from: https://github.com/codetsunami/file-ptracer/blob/master/rnd_contract.c
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*/
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// Compile with: gcc rnd_contract.c -o rnd_contract -g
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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 <time.h>
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#include <sys/types.h>
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#include <unistd.h>
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int main(int argc, char **argv)
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{
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if (argc != 3)
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return fprintf(stderr, "usage %s <file path to randomly edit> <max no. of block modifications>\n", argv[0]);
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// Read from input ts
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char buf[128];
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read(STDIN_FILENO, buf, 128);
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// Read timestamp mentioned in contract args json.
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char tsbuf[14];
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memcpy(tsbuf, &buf[100], 13);
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tsbuf[13] = '\0';
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int ts = atoi(tsbuf);
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//printf("args input: %.13s\n", tsbuf);
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// Use contract args timestamp to initialize random seed.
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srand(ts);
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FILE *f = fopen(argv[1], "rb+");
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if (!f)
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return fprintf(stderr, "could not open file %s\n", argv[1]);
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int max_mod = strtol(argv[2], NULL, 10);
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int fd = fileno(f);
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fseek(f, 0L, SEEK_END);
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size_t len = ftell(f);
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// we don't need to rewind because now we'll use pwrite
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// pick a random number of modications to make between 1 and 50
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int mods = rand() % max_mod + 1;
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pid_t pid = getpid();
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for (int i = 0; i < mods; ++i)
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{
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// pick a random file offset
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size_t offset = rand() % len;
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// pick a random number of bytes to write, up to 100
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size_t bytestowrite = rand() % 100;
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char buf[100];
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// write the bytes to a buffer
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for (int n = 0; n < bytestowrite; ++n)
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buf[n] = rand() % 0xff;
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// write the buffer to the random file location
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int n = pwrite(fd, buf, bytestowrite, offset);
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if (!n)
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continue;
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int start_block = offset / (4 * 1024 * 1024);
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int end_block = (offset + bytestowrite) / (4 * 1024 * 1024);
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for (int i = start_block; i <= end_block; ++i)
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{
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// printf("@@@ pid %d wrote to block %d ... %d bytes\n", pid, i, n);
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fflush(stdout);
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}
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}
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// done!
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fclose(f);
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return 0;
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}
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