/*
 *  deadconn by Davide Libenzi (dead connections pool creator)
 *  Copyright (C) 2001  Davide Libenzi
 *
 *  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
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Davide Libenzi <davidel@xmailserver.org>
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/time.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <netdb.h>
#include <signal.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <errno.h>



#define MAX_CONNECT_ERRORS 4




static int tconnect(struct sockaddr_in const *addr) {
	int sfd;

	if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
		perror("socket");
		return -1;
	}
	if (connect(sfd, (struct sockaddr const *) addr, sizeof(*addr)) < 0) {
		perror("connect");
		close(sfd);
		return -1;
	}

	return sfd;
}

static void usage(char const *prg) {

	fprintf(stderr, "use: %s -s SERVER -p PORT -n NUMCONN [-R INITREQ] [-h]\n", prg);
}

int main(int ac, char **av) {
	int i, sfd, errors, port = -1, nconns = -1;
	char const *server = NULL, *req = NULL;
	struct hostent *he;
	struct in_addr inadr;
	struct sockaddr_in addr;

	for (i = 1; i < ac; i++) {
		if (strcmp(av[i], "-s") == 0) {
			if (++i < ac)
				server = av[i];
		} else if (strcmp(av[i], "-p") == 0) {
			if (++i < ac)
				port = atoi(av[i]);
		} else if (strcmp(av[i], "-n") == 0) {
			if (++i < ac)
				nconns = atoi(av[i]);
		} else if (strcmp(av[i], "-R") == 0) {
			if (++i < ac)
				req = av[i];
		} else if (strcmp(av[i], "-h") == 0) {
			usage(av[0]);
			return 1;
		}
	}
	if (server == NULL || port < 0 || nconns < 0) {
		usage(av[0]);
		return 1;
	}
	if (inet_aton(server, &inadr) == 0) {
		if ((he = gethostbyname(server)) == NULL) {
			fprintf(stderr, "unable to resolve: %s\n", server);
			return 2;
		}
		memcpy(&inadr.s_addr, he->h_addr_list[0], he->h_length);
	}
	memset(&addr, 0, sizeof(addr));
	addr.sin_family = AF_INET;
	memcpy(&addr.sin_addr, &inadr.s_addr, 4);
	addr.sin_port = htons((short int) port);
	for (i = 0; i < nconns; i++) {
		errors = 0;
		retry:
		if ((sfd = tconnect(&addr)) != -1) {
			if (req != NULL)
				write(sfd, req, strlen(req));
			errors = 0;
			printf("%d\n", i);
		} else {
			sleep(1);
			if (++errors < MAX_CONNECT_ERRORS)
				goto retry;
			break;
		}
	}
	fprintf(stdout, "%d connections created, press Ctrl-C to exit ...\n", i);
	for (;;)
		sleep(10);

	return 0;
}