/*
* Send netlink query message and read reply.
*/
static
ssize_t netlink_query(char *msgbuf)
{
struct nlmsghdr *nlmsg;
int sock;
/* Create socket */
if ((sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE)) < 0) {
int e = errno;
printf("create netlink socket: (%d: %s)", e, strerror(e));
return -1;
}
/* Send request */
nlmsg = (struct nlmsghdr *)msgbuf;
if (send(sock, nlmsg, nlmsg->nlmsg_len, 0) < 0) {
int e = errno;
printf("write netlink socket: (%d: %s)", e, strerror(e));
return -1;
}
/* Read response */
ssize_t len = netlink_read_reply(sock, msgbuf, 1, getpid());
if (len < 0) {
int e = errno;
printf("read netlink socket: (%d: %s)", e, strerror(e));
return -1;
}
close(sock);
return len;
}
/*
* Send netlink query message and read reply.
*/
static
ssize_t netlink_query(char *msgbuf)
{
int sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
if (sock < 0) {
int e = errno;
printf("create netlink socket failure: (%d: %s)\n", e, strerror(e));
return -1;
}
/* Send request */
struct nlmsghdr *nlmsg = (struct nlmsghdr *)msgbuf;
if (send(sock, nlmsg, nlmsg->nlmsg_len, 0) < 0) {
int e = errno;
printf("write netlink socket failure: (%d: %s)\n", e, strerror(e));
return -1;
}
/* Read response */
errno = 0; /* in case failure does not set it */
ssize_t len = netlink_read_reply(sock, msgbuf, 1, getpid());
if (len < 0) {
int e = errno;
printf("read netlink socket failure: (%d: %s)\n", e, strerror(e));
return -1;
}
close(sock);
return len;
}
