#include <sys/socket.h>
#include <linux/netlink.h>
#include <stdio.h>
struct sockaddr_nl src_addr, dest_addr;  
struct nlmsghdr *nlh = NULL;  
struct iovec iov;  
struct msghdr msg;  
int sock_fd;  
void main() {

sock_fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ISCSI);  
if(sock_fd < 0)  
printf("Socket creatioin failed\n");  

 else  
  printf("soscet created succfully\n");  

 memset(&src_addr, 0, sizeof(src_addr));  
 src_addr.nl_family = AF_NETLINK;  
 src_addr.nl_pid = getpid();  /* self pid */  
 src_addr.nl_groups = 0;  /* not in mcast groups */  

 if(bind(sock_fd, (struct sockaddr*)&src_addr,sizeof(src_addr)) < 0)  
  printf("bind Error\n");  
 else  
  printf("Bind Successful\n");  

 memset(&dest_addr, 0, sizeof(dest_addr));  
 dest_addr.nl_family = AF_NETLINK;  
 dest_addr.nl_pid = 0;   /* For Linux Kernel */  
 dest_addr.nl_groups = 0; /* unicast */  

 nlh=(struct nlmsghdr *)malloc(NLMSG_SPACE(MAX_PAYLOAD));  

 /* Fill the netlink message header */  
 nlh->nlmsg_len = NLMSG_SPACE(MAX_PAYLOAD);  
 nlh->nlmsg_pid = getpid();  /* self pid */  
 nlh->nlmsg_flags = 0;  

 /* Fill in the netlink message payload */  
 strcpy(NLMSG_DATA(nlh), "Hello you!");  

 iov.iov_base = (void *)nlh;  
 iov.iov_len = nlh->nlmsg_len;  

 msg.msg_name = (void *)&dest_addr;  
 msg.msg_namelen = sizeof(dest_addr);  
 msg.msg_iov = &iov;  
 msg.msg_iovlen = 20;  

 // sendmsg(sock_fd, &msg, 0);  

 /* Read message from kernel */  
 memset(nlh, 0, NLMSG_SPACE(MAX_PAYLOAD));  
 printf("%s %d\n",__FILE__,__LINE__);  
 recvmsg(sock_fd, &msg, 0);  
 printf("%s %d\n",__FILE__,__LINE__);  
 printf("Received message payload: %s\n",(char *)NLMSG_DATA(nlh));  

 /* Close Netlink Socket */  
 close(sock_fd);  
}