mirror of
https://github.com/albfan/miraclecast.git
synced 2025-03-09 23:38:56 +00:00
miracled: add wifi-GO support
If we run as GO we need to support local AP events and dhcp-server handling. Both was already supported by our code-base so simply hook it up with miracled-wifi. Note that this adds a severe restriction: we can only have a single p2p-connection per interface. The wpa_supplicant events don't provide enough information to associate the ifnames to devices. But most drivers only support a single STA, anyway, so that's fine. Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
This commit is contained in:
David Herrmann
parent
f12a042306
commit
533959633e
1 changed files with 232 additions and 6 deletions
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@ -23,6 +23,31 @@
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Wifi Interaction
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* As it turns out, no network-manager currently provides any Wifi-P2P APIs,
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* therefore, we have no chance but do it ourselves. This file implements a
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* simple wifi-P2P API by directly talking to a running wpa_supplicant. The
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* supplicant may be managed by an external network-manager or by ourselves.
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*
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* Note that we do *not* intend to keep this interface. Network-managers really
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* ought to provide something like that via DBus. Once they do, we will ditch
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* this abstraction and instead use the given API.
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*
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* But no-one seems to be interested in that, and more importantly, no-one seems
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* to be working on that. Hence, we try to do our best here and implement it
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* ourselves.
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* The current design is to connect to wpa_supplicant on the default per-ifname
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* interface and then manage all P2P related stuff. We run "p2p_find" to start a
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* peer-discovery on request and advertice each found peer via the event
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* interface. On provision-request or on explicit connect-request, we start a
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* P2P connection to the peer. Note that we actively prevent multiple such
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* connections at the same time. The wpa_supplicant API is not able to assign
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* local groups to p2p-addresses, so we cannot support more than one GO on a
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* single interface. But that's usually fine as most drivers only support a
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* single AP, anyway.
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*/
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#define LOG_SUBSYSTEM "wifi"
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#include <errno.h>
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@ -54,6 +79,8 @@ struct wifi {
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struct wfd_wpa_ctrl *wpa;
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sd_event_source *wpa_source;
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struct shl_dlist devs;
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struct wifi_dev *connection;
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struct wifi_dev *pending;
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bool discoverable : 1;
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bool hup : 1;
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@ -67,6 +94,7 @@ struct wifi_dev {
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struct wifi *w;
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char mac[WFD_WPA_EVENT_MAC_STRLEN];
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char iface[WFD_WPA_EVENT_MAC_STRLEN];
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char pin[WIFI_PIN_STRLEN + 1];
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unsigned int provision;
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@ -104,7 +132,7 @@ static struct wifi_dev *wifi_find_dev_by_mac(struct wifi *w, const char *mac)
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shl_dlist_for_each(i, &w->devs) {
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d = shl_dlist_entry(i, struct wifi_dev, list);
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if (!strcasecmp(d->mac, mac))
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if (!strcasecmp(d->mac, mac) || !strcasecmp(d->iface, mac))
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return d;
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}
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@ -498,6 +526,9 @@ static void wifi_event_p2p_go_neg_success(struct wifi *w, char *msg,
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log_debug("received P2P-GO-NEG-SUCCESS: %u:%s",
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ev->p.p2p_go_neg_success.role, d->mac);
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strcpy(d->iface, ev->p.p2p_go_neg_success.peer_iface);
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w->pending = d;
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}
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static void wifi_event_p2p_group_started(struct wifi *w, char *msg,
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@ -507,8 +538,18 @@ static void wifi_event_p2p_group_started(struct wifi *w, char *msg,
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d = wifi_find_dev_by_mac(w, ev->p.p2p_group_started.go_mac);
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if (!d) {
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log_debug("stray P2P-GROUP-STARTED event: %s", msg);
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return;
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/* If we cannot find the GO, it's probably because *we* are the
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* GO. Unfortunately, wpa_supplicant doesn't provide the peer
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* this group is for so just check whether we have a pending
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* local GO and use it.
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* Yes, this whole w->pending thing is a hack, but what can
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* we do.. */
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if (w->connection || !w->pending) {
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log_debug("stray P2P-GROUP-STARTED event: %s", msg);
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return;
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}
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d = w->pending;
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}
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log_debug("received P2P-GROUP-STARTED: %s:%u:%s",
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@ -525,6 +566,7 @@ static void wifi_event_p2p_group_started(struct wifi *w, char *msg,
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return;
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}
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w->pending = NULL;
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wifi_dev_start(d, ev->p.p2p_group_started.ifname,
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ev->p.p2p_group_started.role);
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}
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@ -551,6 +593,46 @@ static void wifi_event_p2p_group_removed(struct wifi *w, char *msg,
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wifi_dev_stop(d);
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}
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static void wifi_event_ap_sta_connected(struct wifi *w, char *msg,
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struct wfd_wpa_event *ev)
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{
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struct wifi_dev *d;
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d = wifi_find_dev_by_mac(w, ev->p.ap_sta_connected.iface);
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if (!d) {
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d = wifi_find_dev_by_mac(w, ev->p.ap_sta_connected.mac);
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if (!d) {
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log_debug("stray AP-STA-CONNECTED event: %s", msg);
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return;
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}
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}
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log_debug("received AP-STA-CONNECTED: %s %s",
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ev->p.ap_sta_connected.iface,
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ev->p.ap_sta_connected.mac);
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}
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static void wifi_event_ap_sta_disconnected(struct wifi *w, char *msg,
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struct wfd_wpa_event *ev)
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{
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struct wifi_dev *d;
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d = wifi_find_dev_by_mac(w, ev->p.ap_sta_disconnected.iface);
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if (!d) {
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d = wifi_find_dev_by_mac(w, ev->p.ap_sta_disconnected.mac);
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if (!d) {
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log_debug("stray AP-STA-DISCONNECTED event: %s", msg);
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return;
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}
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}
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log_debug("received AP-STA-DISCONNECTED: %s %s",
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ev->p.ap_sta_disconnected.iface,
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ev->p.ap_sta_disconnected.mac);
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wifi_dev_stop(d);
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}
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static void wifi_event_ctrl_event_terminating(struct wifi *w, char *msg,
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struct wfd_wpa_event *ev)
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{
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@ -600,6 +682,12 @@ static void wifi_wpa_event_fn(struct wfd_wpa_ctrl *ctrl, void *data,
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case WFD_WPA_EVENT_P2P_GROUP_REMOVED:
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wifi_event_p2p_group_removed(w, buf, &ev);
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break;
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case WFD_WPA_EVENT_AP_STA_CONNECTED:
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wifi_event_ap_sta_connected(w, buf, &ev);
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break;
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case WFD_WPA_EVENT_AP_STA_DISCONNECTED:
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wifi_event_ap_sta_disconnected(w, buf, &ev);
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break;
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case WFD_WPA_EVENT_CTRL_EVENT_SCAN_STARTED:
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/* ignore */
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break;
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@ -942,11 +1030,64 @@ static int wifi_dev_spawn_dhcp_client(struct wifi_dev *d)
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return 0;
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}
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static int wifi_dev_spawn_dhcp_server(struct wifi_dev *d, unsigned int subnet)
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{
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char *argv[64], loglevel[64], commfd[64], prefix[64];
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int i, r, fds[2];
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pid_t pid;
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sigset_t mask;
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r = socketpair(AF_UNIX, SOCK_SEQPACKET, 0, fds);
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if (r < 0)
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return log_ERRNO();
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pid = fork();
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if (pid < 0) {
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close(fds[0]);
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close(fds[1]);
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return log_ERRNO();
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} else if (!pid) {
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/* child */
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close(fds[0]);
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sprintf(loglevel, "%u", log_max_sev);
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sprintf(commfd, "%d", fds[1]);
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sprintf(prefix, "192.168.%u", subnet);
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sigemptyset(&mask);
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sigprocmask(SIG_SETMASK, &mask, NULL);
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/* redirect stdout to stderr */
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dup2(2, 1);
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i = 0;
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argv[i++] = (char*) BUILD_BINDIR "/miracle-dhcp";
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argv[i++] = "--server";
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argv[i++] = "--prefix";
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argv[i++] = prefix;
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argv[i++] = "--log-level";
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argv[i++] = loglevel;
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argv[i++] = "--netdev";
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argv[i++] = d->ifname;
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argv[i++] = "--comm-fd";
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argv[i++] = commfd;
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argv[i] = NULL;
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execve(argv[0], argv, environ);
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_exit(1);
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}
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close(fds[1]);
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d->dhcp_comm = fds[0];
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d->dhcp_pid = pid;
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return 0;
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}
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static int wifi_dev_comm_fn(sd_event_source *source, int fd, uint32_t mask,
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void *data)
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{
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struct wifi_dev *d = data;
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char buf[512], *t;
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char buf[512], *t, *ip;
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ssize_t l;
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l = recv(fd, buf, sizeof(buf) - 1, MSG_DONTWAIT);
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@ -986,13 +1127,40 @@ static int wifi_dev_comm_fn(sd_event_source *source, int fd, uint32_t mask,
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free(d->remote_addr);
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d->remote_addr = t;
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break;
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case 'R':
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ip = strchr(t, ' ');
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if (!ip || ip == t || !ip[1]) {
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log_warning("invalid dhcp 'R' line: %s", t);
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free(t);
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break;
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}
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*ip++ = 0;
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if (strcasecmp(t, d->mac) && strcasecmp(t, d->iface)) {
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log_debug("ignore 'R' line for unknown mac");
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free(t);
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break;
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}
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ip = strdup(ip);
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if (!ip) {
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log_vENOMEM();
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free(t);
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break;
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}
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free(t);
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free(d->remote_addr);
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d->remote_addr = ip;
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break;
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default:
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free(t);
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break;
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}
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if (d->local_addr && d->remote_addr) {
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/* got DHCP lease, connection is established */
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/* got/sent DHCP lease, connection is established */
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wifi_dev_set_connected(d, true, true);
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}
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@ -1024,15 +1192,25 @@ static int wifi_dev_start(struct wifi_dev *d, const char *ifname,
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return 0;
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if (!ifname || role >= WFD_WPA_EVENT_ROLE_CNT)
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return log_EINVAL();
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if (d->w->connection)
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return -EALREADY;
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d->ifname = strdup(ifname);
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if (!d->ifname)
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return log_ENOMEM();
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d->role = role;
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d->w->connection = d;
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d->w->pending = NULL;
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switch (d->role) {
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case WFD_WPA_EVENT_ROLE_GO:
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r = wifi_dev_spawn_dhcp_server(d, 77);
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if (r < 0) {
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log_error("cannot spawn DHCP server for: %s:%s",
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ifname, d->mac);
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goto error;
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}
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break;
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case WFD_WPA_EVENT_ROLE_CLIENT:
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r = wifi_dev_spawn_dhcp_client(d);
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@ -1119,6 +1297,9 @@ static void wifi_dev_stop(struct wifi_dev *d)
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free(d->ifname);
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d->ifname = NULL;
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d->role = WFD_WPA_EVENT_ROLE_CNT;
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if (d->w->connection == d)
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d->w->connection = NULL;
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d->w->pending = NULL;
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}
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static void wifi_dev_lost(struct wifi_dev *d)
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@ -1130,6 +1311,8 @@ static void wifi_dev_lost(struct wifi_dev *d)
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wifi_dev_stop(d);
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shl_dlist_unlink(&d->list);
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if (d->w->pending == d)
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d->w->pending = NULL;
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d->w = NULL;
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}
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@ -1188,6 +1371,8 @@ void wifi_dev_allow(struct wifi_dev *d, const char *pin)
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return;
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if (d->provision == WIFI_PROVISION_CNT)
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return;
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if (d->w->connection)
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return;
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r = 0;
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switch (d->provision) {
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@ -1238,12 +1423,53 @@ void wifi_dev_reject(struct wifi_dev *d)
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int wifi_dev_connect(struct wifi_dev *d, unsigned int provision,
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const char *pin)
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{
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int r;
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if (!wifi_dev_is_available(d))
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return log_EINVAL();
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if (wifi_dev_is_running(d))
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return 0;
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if (d->w->connection)
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return -EALREADY;
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return -EINVAL;
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r = 0;
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switch (d->provision) {
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case WIFI_PROVISION_CNT:
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/* fallback */
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case WIFI_PROVISION_PBC:
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r = wifi_requestf_ok(d->w,
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"P2P_CONNECT %s pbc display",
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d->mac);
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break;
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case WIFI_PROVISION_DISPLAY:
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if (!pin || !*pin) {
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r = log_EINVAL();
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break;
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}
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r = wifi_requestf_ok(d->w,
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"P2P_CONNECT %s %s display",
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d->mac, d->pin);
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break;
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case WIFI_PROVISION_PIN:
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if (!pin || !*pin) {
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r = log_EINVAL();
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break;
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}
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r = wifi_requestf_ok(d->w,
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"P2P_CONNECT %s %s keypad",
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d->mac, pin);
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break;
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default:
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r = -EINVAL;
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break;
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}
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if (r < 0)
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log_warning("cannot issue P2P_CONNECT on dev_connect(): %d", r);
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return 0;
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}
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void wifi_dev_disconnect(struct wifi_dev *d)
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