Skip to content
Snippets Groups Projects
Select Git revision
  • master
1 result

327.nfa

Blame
  • Code owners
    Assign users and groups as approvers for specific file changes. Learn more.
    bt-host.c 5.18 KiB
    /*
     * Wrap a host Bluetooth HCI socket in a struct HCIInfo.
     *
     * Copyright (C) 2008 Andrzej Zaborowski  <balrog@zabor.org>
     *
     * This program is free software; you can redistribute it and/or
     * modify it under the terms of the GNU General Public License as
     * published by the Free Software Foundation; either version 2 or
     * (at your option) version 3 of the License.
     *
     * This program 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 General Public License along
     * with this program; if not, see <http://www.gnu.org/licenses/>.
     */
    
    #include "qemu-common.h"
    #include "qemu-char.h"
    #include "net.h"
    #include "bt-host.h"
    
    #ifndef _WIN32
    # include <errno.h>
    # include <sys/ioctl.h>
    # include <sys/uio.h>
    # ifdef CONFIG_BLUEZ
    #  include <bluetooth/bluetooth.h>
    #  include <bluetooth/hci.h>
    #  include <bluetooth/hci_lib.h>
    # else
    #  include "hw/bt.h"
    #  define HCI_MAX_FRAME_SIZE	1028
    # endif
    
    struct bt_host_hci_s {
        struct HCIInfo hci;
        int fd;
    
        uint8_t hdr[HCI_MAX_FRAME_SIZE];
        int len;
    };
    
    static void bt_host_send(struct HCIInfo *hci,
                    int type, const uint8_t *data, int len)
    {
        struct bt_host_hci_s *s = (struct bt_host_hci_s *) hci;
        uint8_t pkt = type;
        struct iovec iv[2];
    
        iv[0].iov_base = (void *)&pkt;
        iv[0].iov_len  = 1;
        iv[1].iov_base = (void *) data;
        iv[1].iov_len  = len;
    
        while (writev(s->fd, iv, 2) < 0) {
            if (errno != EAGAIN && errno != EINTR) {
                fprintf(stderr, "qemu: error %i writing bluetooth packet.\n",
                                errno);
                return;
            }
        }
    }
    
    static void bt_host_cmd(struct HCIInfo *hci, const uint8_t *data, int len)
    {
        bt_host_send(hci, HCI_COMMAND_PKT, data, len);
    }
    
    static void bt_host_acl(struct HCIInfo *hci, const uint8_t *data, int len)
    {
        bt_host_send(hci, HCI_ACLDATA_PKT, data, len);
    }
    
    static void bt_host_sco(struct HCIInfo *hci, const uint8_t *data, int len)
    {
        bt_host_send(hci, HCI_SCODATA_PKT, data, len);
    }
    
    static void bt_host_read(void *opaque)
    {
        struct bt_host_hci_s *s = (struct bt_host_hci_s *) opaque;
        uint8_t *pkt;
        int pktlen;
    
        /* Seems that we can't read only the header first and then the amount
         * of data indicated in the header because Linux will discard everything
         * that's not been read in one go.  */
        s->len = read(s->fd, s->hdr, sizeof(s->hdr));
    
        if (s->len < 0) {
            fprintf(stderr, "qemu: error %i reading HCI frame\n", errno);
            return;
        }
    
        pkt = s->hdr;
        while (s->len --)
            switch (*pkt ++) {
            case HCI_EVENT_PKT:
                if (s->len < 2)
                    goto bad_pkt;
    
                pktlen = MIN(pkt[1] + 2, s->len);
                s->hci.evt_recv(s->hci.opaque, pkt, pktlen);
                s->len -= pktlen;
                pkt += pktlen;
    
                /* TODO: if this is an Inquiry Result event, it's also
                 * interpreted by Linux kernel before we received it, possibly
                 * we should clean the kernel Inquiry cache through
                 * ioctl(s->fd, HCI_INQUIRY, ...).  */
                break;
    
            case HCI_ACLDATA_PKT:
                if (s->len < 4)
                    goto bad_pkt;
    
                pktlen = MIN(((pkt[3] << 8) | pkt[2]) + 4, s->len);
                s->hci.acl_recv(s->hci.opaque, pkt, pktlen);
                s->len -= pktlen;
                pkt += pktlen;
                break;
    
            case HCI_SCODATA_PKT:
                if (s->len < 3)
                    goto bad_pkt;
    
                pktlen = MIN(pkt[2] + 3, s->len);
                s->len -= pktlen;
                pkt += pktlen;
                break;
    
            default:
            bad_pkt:
                fprintf(stderr, "qemu: bad HCI packet type %02x\n", pkt[-1]);
            }
    }
    
    static int bt_host_bdaddr_set(struct HCIInfo *hci, const uint8_t *bd_addr)
    {
        return -ENOTSUP;
    }
    
    struct HCIInfo *bt_host_hci(const char *id)
    {
        struct bt_host_hci_s *s;
        int fd = -1;
    # ifdef CONFIG_BLUEZ
        int dev_id = hci_devid(id);
        struct hci_filter flt;
    
        if (dev_id < 0) {
            fprintf(stderr, "qemu: `%s' not available\n", id);
            return 0;
        }
    
        fd = hci_open_dev(dev_id);
    
        /* XXX: can we ensure nobody else has the device opened?  */
    # endif
    
        if (fd < 0) {
            fprintf(stderr, "qemu: Can't open `%s': %s (%i)\n",
                            id, strerror(errno), errno);
            return NULL;
        }
    
    # ifdef CONFIG_BLUEZ
        hci_filter_clear(&flt);
        hci_filter_all_ptypes(&flt);
        hci_filter_all_events(&flt);
    
        if (setsockopt(fd, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) {
            fprintf(stderr, "qemu: Can't set HCI filter on socket (%i)\n", errno);
            return 0;
        }
    # endif
    
        s = g_malloc0(sizeof(struct bt_host_hci_s));
        s->fd = fd;
        s->hci.cmd_send = bt_host_cmd;
        s->hci.sco_send = bt_host_sco;
        s->hci.acl_send = bt_host_acl;
        s->hci.bdaddr_set = bt_host_bdaddr_set;
    
        qemu_set_fd_handler(s->fd, bt_host_read, NULL, s);
    
        return &s->hci;
    }
    #else
    struct HCIInfo *bt_host_hci(const char *id)
    {
        fprintf(stderr, "qemu: bluetooth passthrough not supported (yet)\n");
    
        return 0;
    }
    #endif