add new fun module that automatically mutes your audio devices when you leave with your bluetooth phone, and unmutes when you come back

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@2048 fefdeb5f-60dc-0310-8127-8f9354f1896f

src/modules/bt-proximity-helper.c

@@ -0,0 +1,210 @@
+/* $Id$ */
+
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2007 Lennart Poettering
+
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published
+  by the Free Software Foundation; either version 2 of the License,
+  or (at your option) any later version.
+
+  PulseAudio is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+/*
+ * Small SUID helper that allows us to ping a BT device. Borrows
+ * heavily from bluez-utils' l2ping, which is licensed as GPL2+, too
+ * and comes with a copyright like this:
+ *
+ *  Copyright (C) 2000-2001  Qualcomm Incorporated
+ *  Copyright (C) 2002-2003  Maxim Krasnyansky <maxk@qualcomm.com>
+ *  Copyright (C) 2002-2007  Marcel Holtmann <marcel@holtmann.org>
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#undef NDEBUG
+
+#include <assert.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <sys/select.h>
+
+#include <bluetooth/bluetooth.h>
+#include <bluetooth/hci.h>
+#include <bluetooth/hci_lib.h>
+#include <bluetooth/l2cap.h>
+
+#define PING_STRING "PulseAudio"
+#define IDENT 200
+#define TIMEOUT 4
+#define INTERVAL 2
+
+static void update_status(int found) {
+    static int status = -1;
+
+    if (!found && status != 0)
+        printf("-");
+    if (found && status <= 0)
+        printf("+");
+
+    fflush(stdout);
+    status = !!found;
+}
+
+int main(int argc, char *argv[]) {
+    struct sockaddr_l2 addr;
+    union {
+        l2cap_cmd_hdr hdr;
+        uint8_t buf[L2CAP_CMD_HDR_SIZE + sizeof(PING_STRING)];
+    }  packet;
+    int fd = -1;
+    uint8_t id = IDENT;
+    int connected = 0;
+
+    assert(argc == 2);
+
+    for (;;) {
+        fd_set fds;
+        struct timeval end;
+        ssize_t r;
+
+        if (!connected) {
+
+            if (fd >= 0)
+                close(fd);
+
+            if ((fd = socket(PF_BLUETOOTH, SOCK_RAW, BTPROTO_L2CAP)) < 0) {
+                fprintf(stderr, "socket(PF_BLUETOOTH, SOCK_RAW, BTPROTO_L2CAP) failed: %s", strerror(errno));
+                goto finish;
+            }
+
+            memset(&addr, 0, sizeof(addr));
+            addr.l2_family = AF_BLUETOOTH;
+            bacpy(&addr.l2_bdaddr, BDADDR_ANY);
+
+            if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+                fprintf(stderr, "bind() failed: %s", strerror(errno));
+                goto finish;
+            }
+
+            memset(&addr, 0, sizeof(addr));
+            addr.l2_family = AF_BLUETOOTH;
+            str2ba(argv[1], &addr.l2_bdaddr);
+
+            if (connect(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+
+                if (errno == EHOSTDOWN || errno == ECONNRESET || errno == ETIMEDOUT) {
+                    update_status(0);
+                    sleep(INTERVAL);
+                    continue;
+                }
+
+                fprintf(stderr, "connect() failed: %s", strerror(errno));
+                goto finish;
+            }
+
+            connected = 1;
+        }
+
+        assert(connected);
+
+        memset(&packet, 0, sizeof(packet));
+        strcpy((char*) packet.buf + L2CAP_CMD_HDR_SIZE, PING_STRING);
+        packet.hdr.ident = id;
+        packet.hdr.len = htobs(sizeof(PING_STRING));
+        packet.hdr.code = L2CAP_ECHO_REQ;
+
+        if ((r = send(fd, &packet, sizeof(packet), 0)) < 0) {
+
+            if (errno == EHOSTDOWN || errno == ECONNRESET || errno == ETIMEDOUT) {
+                update_status(0);
+                connected = 0;
+                sleep(INTERVAL);
+                continue;
+            }
+
+            fprintf(stderr, "send() failed: %s", strerror(errno));
+            goto finish;
+        }
+
+        assert(r == sizeof(packet));
+
+        gettimeofday(&end, NULL);
+        end.tv_sec += TIMEOUT;
+
+        for (;;) {
+            struct timeval now, delta;
+
+            gettimeofday(&now, NULL);
+
+            if (timercmp(&end, &now, <=)) {
+                update_status(0);
+                connected = 0;
+                sleep(INTERVAL);
+                break;
+            }
+
+            timersub(&end, &now, &delta);
+
+            FD_ZERO(&fds);
+            FD_SET(fd, &fds);
+
+            if (select(fd+1, &fds, NULL, NULL, &delta) < 0) {
+                fprintf(stderr, "select() failed: %s", strerror(errno));
+                goto finish;
+            }
+
+            if ((r = recv(fd, &packet, sizeof(packet), 0)) <= 0) {
+
+                if (errno == EHOSTDOWN || errno == ECONNRESET || errno == ETIMEDOUT) {
+                    update_status(0);
+                    connected = 0;
+                    sleep(INTERVAL);
+                    break;
+                }
+
+                fprintf(stderr, "send() failed: %s", r == 0 ? "EOF" : strerror(errno));
+                goto finish;
+            }
+
+            assert(r >= L2CAP_CMD_HDR_SIZE);
+
+            if (packet.hdr.ident != id)
+                continue;
+
+            if (packet.hdr.code == L2CAP_ECHO_RSP || packet.hdr.code == L2CAP_COMMAND_REJ) {
+
+                if (++id >= 0xFF)
+                    id = IDENT;
+
+                update_status(1);
+                sleep(INTERVAL);
+                break;
+            }
+        }
+    }
+
+finish:
+
+    if (fd >= 0)
+        close(fd);
+
+    return 1;
+}