Dmitry V. Levin
d9f7e7a439
NETLINK_INET_DIAG was introduced in linux v2.6.14, NETLINK_SOCK_DIAG was added much later in linux v3.3. * net.c [!NETLINK_SOCK_DIAG && NETLINK_INET_DIAG] (NETLINK_SOCK_DIAG): Define. * socketutils.c: Likewise. * tests/netlink_unix_diag.c: Likewise.
104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
#include <assert.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <linux/netlink.h>
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#include <linux/sock_diag.h>
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#include <linux/unix_diag.h>
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#if !defined NETLINK_SOCK_DIAG && defined NETLINK_INET_DIAG
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# define NETLINK_SOCK_DIAG NETLINK_INET_DIAG
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#endif
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static int
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send_query(const int fd, const int family, const int proto)
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{
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struct sockaddr_nl nladdr = {
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.nl_family = AF_NETLINK
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};
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struct {
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struct nlmsghdr nlh;
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struct unix_diag_req udr;
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} req = {
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.nlh = {
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.nlmsg_len = sizeof(req),
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.nlmsg_type = SOCK_DIAG_BY_FAMILY,
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.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST
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},
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.udr = {
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.sdiag_family = family,
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.sdiag_protocol = proto,
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.udiag_states = -1,
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.udiag_show = UDIAG_SHOW_NAME | UDIAG_SHOW_PEER
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}
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};
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struct iovec iov = {
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.iov_base = &req,
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.iov_len = sizeof(req)
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};
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struct msghdr msg = {
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.msg_name = (void*)&nladdr,
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.msg_namelen = sizeof(nladdr),
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.msg_iov = &iov,
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.msg_iovlen = 1
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};
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return sendmsg(fd, &msg, 0) > 0;
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}
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static int
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check_responses(const int fd)
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{
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static char buf[8192];
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struct sockaddr_nl nladdr = {
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.nl_family = AF_NETLINK
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};
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struct iovec iov = {
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.iov_base = buf,
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.iov_len = sizeof(buf)
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};
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struct msghdr msg = {
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.msg_name = (void*)&nladdr,
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.msg_namelen = sizeof(nladdr),
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.msg_iov = &iov,
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.msg_iovlen = 1
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};
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ssize_t ret = recvmsg(fd, &msg, 0);
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if (ret <= 0)
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return 0;
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struct nlmsghdr *h = (struct nlmsghdr*)buf;
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return (NLMSG_OK(h, ret) &&
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h->nlmsg_type != NLMSG_ERROR &&
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h->nlmsg_type != NLMSG_DONE) ? 1 : 0;
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}
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#define SUN_PATH "netlink_unix_diag_socket"
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int main(void)
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{
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struct sockaddr_un addr = {
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.sun_family = AF_UNIX,
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.sun_path = SUN_PATH
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};
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socklen_t len = offsetof(struct sockaddr_un, sun_path) + sizeof(SUN_PATH);
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close(0);
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close(1);
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(void) unlink(SUN_PATH);
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assert(socket(PF_LOCAL, SOCK_STREAM, 0) == 0);
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assert(bind(0, (struct sockaddr *) &addr, len) == 0);
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assert(listen(0, 5) == 0);
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assert(unlink(SUN_PATH) == 0);
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if (socket(AF_NETLINK, SOCK_RAW, NETLINK_SOCK_DIAG) != 1)
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return 77;
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return (send_query(1, AF_UNIX, 0) &&
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check_responses(1)) ? 0 : 77;
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}
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