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bindshell_client.c
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bindshell_client.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <pthread.h>
#include <string.h>
//buffer size may vary
#define BUFFER_SIZE 1024
void *recvData(void *vargp);
int main(int argc, char const *argv[])
{
if (argc != 3)
{
printf("Usage %s <ip> <port>\n", argv[0]);
exit(1);
}
//Create socket and ip+port struct
int sockfd = socket(AF_INET, SOCK_STREAM, 0);
struct sockaddr_in serv_addr;
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(atoi(argv[2]));
inet_aton(argv[1], &serv_addr.sin_addr); //ok
//connect
int res = connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));
//start thread that will receive data. We send sockfd as arg
pthread_t thread_id;
pthread_create(&thread_id, NULL, recvData, (void *)&sockfd);
//pthread_join(thread_id, NULL);
char buffer[BUFFER_SIZE];
do {
//we need to bzero() buffer since it still holds old data
bzero(buffer,BUFFER_SIZE);
fgets(buffer, BUFFER_SIZE - 1, stdin);
write(sockfd, buffer, strlen(buffer));
} while (strcmp(buffer, "exit\n") != 0);
//once we exit, don't forget to kill the receive thread
pthread_cancel(thread_id);
close(sockfd);
return 0;
}
void *recvData(void *vargp)
{
//retrieve sockfd as arg so we can use it in read()
int *sockfd = (int *)vargp;
char buffer[BUFFER_SIZE];
while (1)
{
//always bzero() before read
bzero(buffer,BUFFER_SIZE);
//read() is non-blocking
int n = read(*sockfd, buffer, BUFFER_SIZE - 1);
if (n > -1) printf("> %s", buffer);
//just a little pause
sleep(0.5);
}
return NULL;
}