/*
* This file is part of vbig.
- * Copyright (C) 2011 Richard Kettlewell
+ * Copyright (C) 2011, 2013 Richard Kettlewell
+ * Copyright (C) 2013 Ian Jackson
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include <sys/stat.h>
#include "Arcfour.h"
+#define DEFAULT_SEED_LENGTH 2048;
+
// Command line options
const struct option opts[] = {
{ "seed", required_argument, 0, 's' },
+ { "seed-file", required_argument, 0, 'S' },
+ { "seed-length", required_argument, 0, 'L' },
{ "both", no_argument, 0, 'b' },
{ "verify", no_argument, 0, 'v' },
{ "create", no_argument, 0, 'c' },
{ "flush", no_argument, 0, 'f' },
{ "entire", no_argument, 0, 'e' },
+ { "progress", no_argument, 0, 'p' },
{ "help", no_argument, 0, 'h' },
{ "version", no_argument, 0, 'V' },
{ 0, 0, 0, 0 },
printf("vbig - create or verify a large but pseudo-random file\n"
"\n"
"Usage:\n"
- " vbig [--seed SEED] --verify|--create PATH [SIZE]\n"
+ " vbig [OPTIONS] [--both|--verify|--create] PATH] [SIZE]\n"
"\n"
"Options:\n"
- " --seed, -s Specify random seed\n"
- " --verify, -v Verify that PATH contains the expected contents\n"
- " --create, -c Create PATH with psuedo-random contents\n"
- " --flush, -f Flush cache\n"
- " --entire, -e Write until full; read until EOF\n"
- " --help, -h Display usage message\n"
- " --version, -V Display version string\n");
+ " --seed, -s Specify random seed as string\n"
+ " --seed-file, -S Read random seed from (start of) this file\n"
+ " --seed-length, -L Set (maximum) seed length to read from file\n"
+ " --verify, -v Verify that PATH contains the expected contents\n"
+ " --create, -c Create PATH with psuedo-random contents\n"
+ " --both, -b Do both create and verify (default)\n"
+ " --flush, -f Flush cache\n"
+ " --entire, -e Write until full; read until EOF\n"
+ " --progress, -p Show progress as we go\n"
+ " --help, -h Display usage message\n"
+ " --version, -V Display version string\n");
}
// Possible modes of operation
BOTH
};
+static void clearprogress();
+
// Report an error and exit
static void fatal(int errno_value, const char *fmt, ...) {
va_list ap;
+ clearprogress();
fprintf(stderr, "ERROR: ");
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
static long long execute(mode_type mode, bool entire, const char *show);
-static const char *seed = "hexapodia as the key insight";
+static const char default_seed[] = "hexapodia as the key insight";
+static void *seed;
+static size_t seedlen;
+static const char *seedpath;
static const char *path;
static bool entireopt = false;
static bool flush = false;
+static bool progress = false;
static long long size;
int main(int argc, char **argv) {
mode_type mode = BOTH;
int n;
- while((n = getopt_long(argc, argv, "+s:vcefhV", opts, 0)) >= 0) {
+ char *ep;
+ while((n = getopt_long(argc, argv, "+s:S:L:vcepfhV", opts, 0)) >= 0) {
switch(n) {
- case 's': seed = optarg; break;
+ case 's': seed = optarg; seedlen = strlen(optarg); break;
+ case 'S': seedpath = optarg; break;
+ case 'L':
+ seedlen = strtoul(optarg,&ep,0);
+ if(ep==optarg || *ep) fatal(0, "bad number for -S");
+ break;
case 'b': mode = BOTH; break;
case 'v': mode = VERIFY; break;
case 'c': mode = CREATE; break;
case 'e': entireopt = true; break;
+ case 'p': progress = true; break;
case 'f': flush = true; break;
case 'h': help(); exit(0);
case 'V': puts(VERSION); exit(0);
}
argc -= optind;
argv += optind;
+ /* expect PATH [SIZE] */
if(argc > 2)
fatal(0, "excess arguments");
+ /* If --both but no SIZE, assume a block device, which is to be filled */
if(argc == 1 && mode == BOTH)
entireopt = true;
if(entireopt) {
if(argc != 1)
fatal(0, "with --entire, size should not be specified");
} else {
+ /* --create without --entire requires PATH SIZE
+ * --verify just requires PATH, SIZE is optional */
if(argc < (mode == VERIFY ? 1 : 2))
fatal(0, "insufficient arguments");
}
+ if(seed && seedpath)
+ fatal(0, "both --seed and --seed-file specified");
+ if(mode == BOTH && !seed && !seedpath) {
+ /* --both and no seed specified; pick a random one */
+#ifdef HAVE_RANDOM_DEVICE
+ seedpath = RANDOM_DEVICE;
+#else
+ fatal(0, "no --seed or --seed-file specified in --both mode"
+ " and random device not supported on this system");
+#endif
+ }
+ if(seedpath) {
+ if(!seedlen)
+ seedlen = DEFAULT_SEED_LENGTH;
+ FILE *seedfile = fopen(seedpath, "rb");
+ if(!seedfile)
+ fatal(errno, "%s", seedpath);
+ seed = malloc(seedlen);
+ if(!seed)
+ fatal(errno, "allocate seed");
+ seedlen = fread(seed, 1, seedlen, seedfile);
+ if(ferror(seedfile))
+ fatal(errno, "read %s", seedpath);
+ fclose(seedfile);
+ }
+ if (!seed) {
+ /* No seed specified, use a constant */
+ seed = (void*)default_seed;
+ seedlen = sizeof(default_seed)-1;
+ }
path = argv[0];
if(argc > 1) {
+ /* Explicit size specified */
errno = 0;
char *end;
size = strtoll(argv[1], &end, 10);
if(end == argv[1])
fatal(0, "invalid size");
if(!strcmp(end, "K"))
- size *= 1024;
+ size <<= 10;
else if(!strcmp(end, "M"))
- size *= 1024 * 1024;
+ size <<= 20;
else if(!strcmp(end, "G"))
- size *= 1024 * 1024 * 1024;
+ size <<= 30;
else if(*end)
fatal(0, "invalid size");
} else if(entireopt) {
- size = LONG_LONG_MAX;
+ /* Use stupidly large size as a proxy for 'infinite' */
+ size = LLONG_MAX;
} else {
+ /* Retrieve size from target (which must exist) */
struct stat sb;
if(stat(path, &sb) < 0)
fatal(errno, "stat %s", path);
return 0;
}
+// flush stdout, fatal on error
+static void flushstdout() {
+ if(ferror(stdout) || fflush(stdout))
+ fatal(errno, "flush stdout");
+}
+
+// clear the progress indicator
+static void clearprogress() {
+ if (!progress) return;
+ printf(" %-10s %*s \r", "", (int)sizeof(long long)*4, "");
+ flushstdout();
+}
+
+// update progress indicator
+static void showprogress(long long amount, const char *show) {
+ if (!progress) return;
+
+ static int counter;
+ if (counter++ < 1000) return;
+ counter = 0;
+
+ int triples = sizeof(amount);
+ char rawbuf[triples*3 + 1];
+ char outbuf[triples*4 + 1];
+ snprintf(rawbuf, sizeof(rawbuf), "% *lld", (int)sizeof(rawbuf)-1, amount);
+ for (int i=0; i<triples; i++) {
+ outbuf[i*4] = ' ';
+ memcpy(outbuf + i*4 + 1, rawbuf + i*3, 3);
+ }
+ outbuf[triples*4] = 0;
+ printf(" %-10s %s...\r", outbuf, show);
+ flushstdout();
+}
+
+// write/verify the target file
static long long execute(mode_type mode, bool entire, const char *show) {
- Arcfour rng(seed, strlen(seed));
+ Arcfour rng((const uint8_t *)seed, seedlen);
FILE *fp = fopen(path, mode == VERIFY ? "rb" : "wb");
if(!fp)
fatal(errno, "%s", path);
flushCache(fp);
if(mode == CREATE && entire)
setvbuf(fp, 0, _IONBF, 0);
- char generated[4096], input[4096];
+ uint8_t generated[4096], input[4096];
long long remain = size;
+ static const size_t rc4drop = 3072; // en.wikipedia.org/wiki/RC4#Security
+ assert(rc4drop <= sizeof(generated));
+ rng.stream(generated, rc4drop);
while(remain > 0) {
size_t bytesGenerated = (remain > (ssize_t)sizeof generated
? sizeof generated
if(memcmp(generated, input, bytesRead)) {
for(size_t n = 0; n < bytesRead; ++n)
if(generated[n] != input[n])
- fatal(0, "%s corrupted at %lld/%lld bytes (expected %d got %d)",
+ fatal(0, "%s: corrupted at %lld/%lld bytes (expected %d got %d)",
path, size - remain + n, size,
(unsigned char)generated[n], (unsigned char)input[n]);
}
+ /* Truncated */
if(bytesRead < bytesGenerated) {
if(entire) {
assert(feof(fp));
}
}
remain -= bytesGenerated;
+ showprogress(size - remain, mode == VERIFY ? "verifying" : "writing");
}
+ clearprogress();
if(mode == VERIFY && !entire && getc(fp) != EOF)
fatal(0, "%s: extended beyond %lld bytes",
path, size);
}
if(fclose(fp) < 0)
fatal(errno, "%s", path);
+ /* Actual size written/verified */
long long done = size - remain;
if(show) {
printf("%lld bytes (%lldM, %lldG) %s\n",
done, done >> 20, done >> 30,
show);
- if(ferror(stdout) || fflush(stdout))
- fatal(errno, "flush stdout");
+ flushstdout();
}
return done;
}
~ianmdlvl / vbig.git / blobdiff