blob: 979ab88ddd3c456517142ff5195916dc16be599d [file] [log] [blame]
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <linux/netlink.h>
#include <linux/sock_diag.h>
#include <linux/unix_diag.h>
#if !defined NETLINK_SOCK_DIAG && defined NETLINK_INET_DIAG
# define NETLINK_SOCK_DIAG NETLINK_INET_DIAG
#endif
static int
send_query(const int fd, const int family, const int proto)
{
struct sockaddr_nl nladdr = {
.nl_family = AF_NETLINK
};
struct {
struct nlmsghdr nlh;
struct unix_diag_req udr;
} req = {
.nlh = {
.nlmsg_len = sizeof(req),
.nlmsg_type = SOCK_DIAG_BY_FAMILY,
.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
},
.udr = {
.sdiag_family = family,
.sdiag_protocol = proto,
.udiag_states = -1,
.udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_PEER
}
};
struct iovec iov = {
.iov_base = &req,
.iov_len = sizeof(req)
};
struct msghdr msg = {
.msg_name = (void*)&nladdr,
.msg_namelen = sizeof(nladdr),
.msg_iov = &iov,
.msg_iovlen = 1
};
return sendmsg(fd, &msg, 0) > 0;
}
static int
check_responses(const int fd)
{
static char buf[8192];
struct sockaddr_nl nladdr = {
.nl_family = AF_NETLINK
};
struct iovec iov = {
.iov_base = buf,
.iov_len = sizeof(buf)
};
struct msghdr msg = {
.msg_name = (void*)&nladdr,
.msg_namelen = sizeof(nladdr),
.msg_iov = &iov,
.msg_iovlen = 1
};
ssize_t ret = recvmsg(fd, &msg, 0);
if (ret <= 0)
return 0;
struct nlmsghdr *h = (struct nlmsghdr*)buf;
return (NLMSG_OK(h, ret) &&
h->nlmsg_type != NLMSG_ERROR &&
h->nlmsg_type != NLMSG_DONE) ? 1 : 0;
}
#define SUN_PATH "netlink_unix_diag_socket"
int main(void)
{
struct sockaddr_un addr = {
.sun_family = AF_UNIX,
.sun_path = SUN_PATH
};
socklen_t len = offsetof(struct sockaddr_un, sun_path) + sizeof(SUN_PATH);
close(0);
close(1);
(void) unlink(SUN_PATH);
assert(socket(PF_LOCAL, SOCK_STREAM, 0) == 0);
assert(bind(0, (struct sockaddr *) &addr, len) == 0);
assert(listen(0, 5) == 0);
assert(unlink(SUN_PATH) == 0);
if (socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG) != 1)
return 77;
return (send_query(1, AF_UNIX, 0) &&
check_responses(1)) ? 0 : 77;
}