/*
  * portscan.c: tcp portscanner for plan 9
  * sean caron (scaron@umich.edu)
*/

#include <u.h>
#include <libc.h>

int main(int argc, char **argv);

int main(int argc, char **argv) {

	int port = 1;
	int limit = 1;
	int result = 0;
	char connport[128], devdir[128], *dialaddr;

	if (argc != 3) {
		print("usage: %s host maxport\n", argv[0]);
		exits(0);
	}

	limit = atoi(argv[2]);

	while (port <= limit) {

		sprint(connport, "%d", port);

		dialaddr = netmkaddr(argv[1], "tcp", connport);

		result = dial(dialaddr, 0, devdir, 0);

		if (result >= 0) {
			print("%s:%d open\n", argv[1], port);
			hangup(result);
		}

		port = port + 1;
	}

}