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#include <sys/socket.h>
#include <linux/netlink.h>
#define MAX_PAYLOAD 1024
struct sockaddr_nl src_addr, dst_addr;
struct nlmsghdr *nlh = NULL;
struct msghdr msg;
struct iovec iov;
int sock_fd;
int main()
{
sock_fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_NITRO);
memset(&src_addr, 0, sizeof(src_addr));
src_addr.nl_family = AF_NETLINK;
src_addr.nl_pid = getpid();
src_addr.nl_groups = 0; // no multicast
bind(sock_fd, (struct sockaddr*)&src_addr, sizeof(src_addr));
memset(&dst_addr, 0, sizeof(dst_addr));
dst_addr.nl_family = AF_NETLINK;
dst_addr.nl_pid = 0; // 0 means kernel
dst_addr.nl_groups = 0; // no multicast
nlh = (struct nlhmsghdr *)malloc(NLMSG_SPACE(MAX_PAYLOAD));
/* Fill the netlink message header */
nlh->nlmsg_len = NLMSG_SPACE(MAX_PAYLOAD);
nlh->nlmsg_pid = getpid();
nlh->nlmsg_flags = 0;
strcpy(NLMSG_DATA(nlh), "Yoo-hoo, Mr. Kernel!");
iov.iov_base = (void *)nlh;
iov.iov_len = nlh->nlmsg_len;
msg.msg_name = (void *)&dst_addr;
msg.msg_namelen = sizeof(dst_addr);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
sendmsg(sock_fd, &msg, 0);
/* Read message from kernel */
memset(nlh, 0, NLMSG_SPACE(MAX_PAYLOAD));
recvmsg(sock_fd, &msg, 0);
printf("Received message payload: %s\n", NLMSG_DATA(nlh));
close(sock_fd);
return (EXIT_SUCCESS);
} |
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