int
if_handlelink(struct dhcpcd_ctx *ctx)
{
return get_netlink(ctx, ctx->iov, NULL,
ctx->link_fd, MSG_DONTWAIT, &link_netlink);
}
static int
send_netlink(struct nlmsghdr *hdr)
{
int r;
struct iovec iov;
struct msghdr msg;
static unsigned int seq;
memset(&iov, 0, sizeof(iov));
iov.iov_base = hdr;
iov.iov_len = hdr->nlmsg_len;
memset(&msg, 0, sizeof(msg));
msg.msg_name = &sock_nl;
msg.msg_namelen = sizeof(sock_nl);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
/* Request a reply */
hdr->nlmsg_flags |= NLM_F_ACK;
hdr->nlmsg_seq = ++seq;
if (sendmsg(sock_fd, &msg, 0) != -1)
r = get_netlink(sock_fd, 0, &err_netlink);
else
r = -1;
return r;
}
static int
send_netlink(struct dhcpcd_ctx *ctx, struct interface *ifp,
int protocol, struct nlmsghdr *hdr,
int (*callback)(struct dhcpcd_ctx *, struct interface *, struct nlmsghdr *))
{
int s, r;
struct sockaddr_nl snl;
struct iovec iov[1];
struct msghdr msg;
memset(&snl, 0, sizeof(snl));
snl.nl_family = AF_NETLINK;
if (protocol == NETLINK_ROUTE) {
struct priv *priv;
priv = (struct priv *)ctx->priv;
s = priv->route_fd;
} else {
if ((s = _open_link_socket(&snl, protocol)) == -1)
return -1;
}
memset(&msg, 0, sizeof(msg));
msg.msg_name = &snl;
msg.msg_namelen = sizeof(snl);
memset(&iov, 0, sizeof(iov));
iov[0].iov_base = hdr;
iov[0].iov_len = hdr->nlmsg_len;
msg.msg_iov = iov;
msg.msg_iovlen = 1;
/* Request a reply */
hdr->nlmsg_flags |= NLM_F_ACK;
hdr->nlmsg_seq = (uint32_t)++ctx->seq;
if (sendmsg(s, &msg, 0) != -1) {
struct priv *priv;
priv = (struct priv *)ctx->priv;
r = get_netlink(ctx, priv->sndrcv_iov, ifp, s, 0, callback);
} else
r = -1;
if (protocol != NETLINK_ROUTE)
close(s);
return r;
}
static int
send_netlink(struct nlmsghdr *hdr)
{
int fd, r;
struct sockaddr_nl nl;
struct iovec iov;
struct msghdr msg;
static unsigned int seq;
if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) == -1)
return -1;
memset(&nl, 0, sizeof(nl));
nl.nl_family = AF_NETLINK;
if (bind(fd, (struct sockaddr *)&nl, sizeof(nl)) == -1) {
close(fd);
return -1;
}
memset(&iov, 0, sizeof(iov));
iov.iov_base = hdr;
iov.iov_len = hdr->nlmsg_len;
memset(&msg, 0, sizeof(msg));
msg.msg_name = &nl;
msg.msg_namelen = sizeof(nl);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
/* Request a reply */
hdr->nlmsg_flags |= NLM_F_ACK;
hdr->nlmsg_seq = ++seq;
if (sendmsg(fd, &msg, 0) != -1)
r = get_netlink(fd, 0, &err_netlink, NULL);
else
r = -1;
close(fd);
return r;
}
int
link_changed(struct interface *iface)
{
return get_netlink(iface->link_fd, MSG_DONTWAIT,
&link_netlink, iface->name);
}
int
manage_link(int fd)
{
return get_netlink(fd, MSG_DONTWAIT, &link_netlink);
}