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/* primitive arbitrary-data frontend for netcat. 0.9 960226
only handles one value per ascii line, but at least parses 0xNN too
an input line containing "%r" during "-g" generates a random byte
todo:
make work on msloss jus' for kicks [workin' on it...]
syntax: data -X [limit]
where X is one of
d: dump raw bytes to ascii format
g: generate raw bytes from ascii input
c: generate ??? of value -- NOTYET
r: generate all random bytes
and limit is how many bytes to generate or dump [unspecified = infinite]
*Hobbit*, started 951004 or so and randomly screwed around with since */
#include <stdio.h>
#ifdef MSDOS /* for MSC only at the moment... */
#include <fcntl.h>
#else /* MSDOS */
#include <sys/file.h>
#define HAVE_RANDOM /* XXX: might have to change */
#endif /* MSDOS */
static char buf_in [128];
static char buf_raw [8192];
static char surveysez[] = "survey sez... XXX\n";
/* fgetss :
wrapper for fgets, that yanks trailing newlines. Doing the work ourselves
instead of calling strchr/strlen/whatever */
char * fgetss (buf, len, from)
char * buf;
size_t len;
FILE * from;
{
register int x;
register char * p, * q;
p = fgets (buf, len, from); /* returns ptr to buf */
if (! p)
return (NULL);
q = p;
for (x = 0; x < len; x++) {
*p = (*p & 0x7f); /* rip parity, just in case */
switch (*p) {
case '\n':
case '\r':
case '\0':
*p = '\0';
return (q);
} /* switch */
p++;
} /* for */
} /* fgetss */
/* randint:
swiped from rndb.c. Generates an INT, you have to mask down to char. */
int randint()
{
register int q;
register int x;
#ifndef HAVE_RANDOM
q = rand();
#else
q = random();
#endif
x = ((q >> 8) & 0xff); /* perturb low byte using some higher bits */
x = q ^ x;
return (x);
}
main (argc, argv)
int argc;
char ** argv;
{
register unsigned char * p;
register char * q;
register int x;
int bc = 0;
int limit = 0; /* num to gen, or 0 = infinite */
register int xlimit; /* running limit */
FILE * txt; /* line-by-line ascii file */
int raw; /* raw bytes fd */
int dumping = 0; /* cmd flags ... */
int genning = 0;
int randing = 0;
memset (buf_in, 0, sizeof (buf_in));
memset (buf_raw, 0, sizeof (buf_raw));
xlimit = 1; /* doubles as "exit flag" */
bc = 1; /* preload, assuming "dump" */
x = getpid() + 687319;
/* if your library doesnt have srandom/random, use srand/rand. [from rnd.c] */
#ifndef HAVE_RANDOM
srand (time(0) + x);
#else
srandom (time(0) + x);
#endif
#ifdef O_BINARY
/* DOS stupidity */
/* Aha: *here's* where that setmode() lib call conflict in ?BSD came from */
x = setmode (0, O_BINARY); /* make stdin raw */
if (x < 0) {
fprintf (stderr, "stdin binary setmode oops: %d\n", x);
exit (1);
}
x = setmode (1, O_BINARY); /* make stdout raw */
if (x < 0) {
fprintf (stderr, "stdout binary setmode oops: %d\n", x);
exit (1);
}
#endif /* O_BINARY */
if (argv[1]) {
p = argv[1]; /* shit-simple single arg parser... */
if (*p == '-') /* dash is optional, we'll deal */
p++;
if (*p == 'd')
dumping++;
if (*p == 'g')
genning++;
if (*p == 'r')
randing++;
} /* if argv 1 */
/* optional second argument: limit # of bytes shoveled either way */
if (argv[2]) {
x = atoi (argv[2]);
if (x)
limit = x;
else
goto wrong;
xlimit = limit;
}
/* Since this prog would likely best be written in assmbler, I'm gonna
write it *like* assembler. So there. */
if (randing)
goto do_rand;
nextbuf: /* loop sleaze */
if (dumping) { /* switch off to wherever */
if (genning)
goto wrong;
goto do_dump;
}
if (genning)
goto do_gen;
wrong:
fprintf (stderr, surveysez); /* if both or neither */
exit (1);
do_gen:
/* here if genning -- original functionality */
q = buf_raw;
bc = 0;
/* suck up lines until eof or buf_raw is full */
while (1) {
p = fgetss (buf_in, 120, stdin);
if (! p)
break; /* EOF */
/* super-primitive version first: one thingie per line */
if (*p == '#') /* comment */
continue;
if (*p == '\0') /* blank line */
continue;
if (*p == '%') { /* escape char? */
p++;
if (*p == 'r') { /* random byte */
x = randint();
goto stuff;
} /* %r */
} /* if "%" escape */
if (*p == '0')
if (*(p+1) == 'x') /* 0x?? */
goto hex;
x = atoi (p); /* reg'lar decimal number */
goto stuff;
hex:
/* A 65 a 97 */
/* xxx: use a conversion table for this or something. Since we ripped the
parity bit, we only need a preset array of 128 with downconversion factors
loaded in *once*. maybe look at scanf... */
p++; p++; /* point at hex-chars */
x = 0;
if ((*p > 96) && (*p < 123)) /* a-z */
*p = (*p - 32); /* this is massively clumsy */
if ((*p > 64) && (*p < 71)) /* A-F */
x = (*p - 55);
if ((*p > 47) && (*p < 58)) /* digits */
x = (*p - 48);
p++;
if (*p) /* another digit? */
x = (x << 4); /* shift to hi half */
if ((*p > 96) && (*p < 123)) /* a-z */
*p = (*p - 32);
if ((*p > 64) && (*p < 71)) /* A-F */
x = (x | (*p - 55)); /* lo half */
if ((*p > 47) && (*p < 58)) /* digits */
x = (x | (*p - 48));
/* fall thru */
stuff: /* cvt to byte and add to buffer */
*q = (x & 0xff);
q++;
bc++;
if (limit) {
xlimit--;
if (xlimit == 0) /* max num reached */
break;
} /* limit */
if (bc >= sizeof (buf_raw)) /* buffer full */
break;
} /* while 1 */
/* now in theory we have our buffer formed; shovel it out */
x = write (1, buf_raw, bc);
if (x <= 0) {
fprintf (stderr, "write oops: %d\n", x);
exit (1);
}
if (xlimit && p)
goto nextbuf; /* go get some more */
exit (0);
do_dump:
/* here if dumping raw stuff into an ascii file */
/* gad, this is *so* much simpler! can we say "don't rewrite printf"? */
x = read (0, buf_raw, 8192);
if (x <= 0)
exit (0);
q = buf_raw;
for ( ; x > 0; x--) {
p = q;
printf ("%-3.3d # 0x%-2.2x # ", *p, *p);
if ((*p > 31) && (*p < 127))
printf ("%c %d\n", *p, bc);
else
printf (". %d\n", bc);
q++;
bc++;
if (limit) {
xlimit--;
if (xlimit == 0) {
fflush (stdout);
exit (0);
}
} /* limit */
} /* for */
goto nextbuf;
do_rand:
/* here if generating all-random bytes. Stays in this loop */
p = buf_raw;
while (1) {
*p = (randint() & 0xff);
write (1, p, 1); /* makes very slow! */
if (limit) {
xlimit--;
if (xlimit == 0)
break;
}
} /* while */
exit (0);
} /* main */
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