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Use a custom PRNG

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This commit is contained in:
Christopher Wellons 2019-02-03 18:00:26 -05:00
parent 7693ce54e3
commit e72daae85f
1 changed files with 14 additions and 6 deletions
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20
endlessh.c
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@ -233,12 +233,19 @@ die(void)
exit(EXIT_FAILURE);
}
static int
randline(char *line, int maxlen)
static unsigned
rand16(unsigned long s[1])
{
int len = 3 + rand() % (maxlen - 2);
s[0] = s[0] * 1103515245UL + 12345UL;
return s[0] >> 16;
}
static int
randline(char *line, int maxlen, unsigned long s[1])
{
int len = 3 + rand16(s) % (maxlen - 2);
for (int i = 0; i < len - 2; i++)
line[i] = 32 + rand() % 95;
line[i] = 32 + rand16(s) % 95;
line[len - 2] = 13;
line[len - 1] = 10;
if (memcmp(line, "SSH-", 4) == 0)
@ -563,7 +570,8 @@ main(int argc, char **argv)
int server = server_create(config.port);
srand(time(0));
unsigned long rng = uepoch();
while (running) {
if (reload) {
/* Configuration reload requested (SIGHUP) */
@ -664,7 +672,7 @@ main(int argc, char **argv)
} else if (revents & POLLOUT) {
char line[256];
int len = randline(line, config.max_line_length);
int len = randline(line, config.max_line_length, &rng);
/* Don't really care if send is short */
ssize_t out = send(fd, line, len, MSG_DONTWAIT);
if (out < 0)