diff options
Diffstat (limited to 'lib/libpcap/libpcap/pcap-bt-monitor-linux.c')
| -rw-r--r-- | lib/libpcap/libpcap/pcap-bt-monitor-linux.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/lib/libpcap/libpcap/pcap-bt-monitor-linux.c b/lib/libpcap/libpcap/pcap-bt-monitor-linux.c new file mode 100644 index 0000000..a693949 --- /dev/null +++ b/lib/libpcap/libpcap/pcap-bt-monitor-linux.c @@ -0,0 +1,273 @@ +/* + * Copyright (c) 2014 Michal Labedzki for Tieto Corporation + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <errno.h> +#include <stdint.h> +#include <stdlib.h> +#include <string.h> + +#include <bluetooth/bluetooth.h> +#include <bluetooth/hci.h> + +#include "pcap/bluetooth.h" +#include "pcap-int.h" + +#include "pcap-bt-monitor-linux.h" + +#define BT_CONTROL_SIZE 32 +#define INTERFACE_NAME "bluetooth-monitor" + +/* + * Fields and alignment must match the declaration in the Linux kernel 3.4+. + * See struct hci_mon_hdr in include/net/bluetooth/hci_mon.h. + */ +struct hci_mon_hdr { + uint16_t opcode; + uint16_t index; + uint16_t len; +} __attribute__((packed)); + +int +bt_monitor_findalldevs(pcap_if_list_t *devlistp, char *err_str) +{ + int ret = 0; + + /* + * Bluetooth is a wireless technology. + * + * This is a device to monitor all Bluetooth interfaces, so + * there's no notion of "connected" or "disconnected", any + * more than there's a notion of "connected" or "disconnected" + * for the "any" device. + */ + if (add_dev(devlistp, INTERFACE_NAME, + PCAP_IF_WIRELESS|PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE, + "Bluetooth Linux Monitor", err_str) == NULL) + { + ret = -1; + } + + return ret; +} + +static int +bt_monitor_read(pcap_t *handle, int max_packets _U_, pcap_handler callback, u_char *user) +{ + struct cmsghdr *cmsg; + struct msghdr msg; + struct iovec iv[2]; + ssize_t ret; + struct pcap_pkthdr pkth; + pcap_bluetooth_linux_monitor_header *bthdr; + u_char *pktd; + struct hci_mon_hdr hdr; + + pktd = (u_char *)handle->buffer + BT_CONTROL_SIZE; + bthdr = (pcap_bluetooth_linux_monitor_header*)(void *)pktd; + + iv[0].iov_base = &hdr; + iv[0].iov_len = sizeof(hdr); + iv[1].iov_base = pktd + sizeof(pcap_bluetooth_linux_monitor_header); + iv[1].iov_len = handle->snapshot; + + memset(&pkth.ts, 0, sizeof(pkth.ts)); + memset(&msg, 0, sizeof(msg)); + msg.msg_iov = iv; + msg.msg_iovlen = 2; + msg.msg_control = handle->buffer; + msg.msg_controllen = BT_CONTROL_SIZE; + + do { + ret = recvmsg(handle->fd, &msg, 0); + if (handle->break_loop) + { + handle->break_loop = 0; + return -2; + } + } while ((ret == -1) && (errno == EINTR)); + + if (ret < 0) { + pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, + errno, "Can't receive packet"); + return -1; + } + + pkth.caplen = ret - sizeof(hdr) + sizeof(pcap_bluetooth_linux_monitor_header); + pkth.len = pkth.caplen; + + for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; cmsg = CMSG_NXTHDR(&msg, cmsg)) { + if (cmsg->cmsg_level != SOL_SOCKET) continue; + + if (cmsg->cmsg_type == SCM_TIMESTAMP) { + memcpy(&pkth.ts, CMSG_DATA(cmsg), sizeof(pkth.ts)); + } + } + + bthdr->adapter_id = htons(hdr.index); + bthdr->opcode = htons(hdr.opcode); + + if (handle->fcode.bf_insns == NULL || + bpf_filter(handle->fcode.bf_insns, pktd, pkth.len, pkth.caplen)) { + callback(user, &pkth, pktd); + return 1; + } + return 0; /* didn't pass filter */ +} + +static int +bt_monitor_inject(pcap_t *handle, const void *buf _U_, size_t size _U_) +{ + pcap_snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, + "Packet injection is not supported yet on Bluetooth monitor devices"); + return -1; +} + +static int +bt_monitor_setdirection(pcap_t *p, pcap_direction_t d) +{ + p->direction = d; + return 0; +} + +static int +bt_monitor_stats(pcap_t *handle _U_, struct pcap_stat *stats) +{ + stats->ps_recv = 0; + stats->ps_drop = 0; + stats->ps_ifdrop = 0; + + return 0; +} + +static int +bt_monitor_activate(pcap_t* handle) +{ + struct sockaddr_hci addr; + int err = PCAP_ERROR; + int opt; + + if (handle->opt.rfmon) { + /* monitor mode doesn't apply here */ + return PCAP_ERROR_RFMON_NOTSUP; + } + + /* + * Turn a negative snapshot value (invalid), a snapshot value of + * 0 (unspecified), or a value bigger than the normal maximum + * value, into the maximum allowed value. + * + * If some application really *needs* a bigger snapshot + * length, we should just increase MAXIMUM_SNAPLEN. + */ + if (handle->snapshot <= 0 || handle->snapshot > MAXIMUM_SNAPLEN) + handle->snapshot = MAXIMUM_SNAPLEN; + + handle->bufsize = BT_CONTROL_SIZE + sizeof(pcap_bluetooth_linux_monitor_header) + handle->snapshot; + handle->linktype = DLT_BLUETOOTH_LINUX_MONITOR; + + handle->read_op = bt_monitor_read; + handle->inject_op = bt_monitor_inject; + handle->setfilter_op = install_bpf_program; /* no kernel filtering */ + handle->setdirection_op = bt_monitor_setdirection; + handle->set_datalink_op = NULL; /* can't change data link type */ + handle->getnonblock_op = pcap_getnonblock_fd; + handle->setnonblock_op = pcap_setnonblock_fd; + handle->stats_op = bt_monitor_stats; + + handle->fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI); + if (handle->fd < 0) { + pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, + errno, "Can't create raw socket"); + return PCAP_ERROR; + } + + handle->buffer = malloc(handle->bufsize); + if (!handle->buffer) { + pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, + errno, "Can't allocate dump buffer"); + goto close_fail; + } + + /* Bind socket to the HCI device */ + addr.hci_family = AF_BLUETOOTH; + addr.hci_dev = HCI_DEV_NONE; + addr.hci_channel = HCI_CHANNEL_MONITOR; + + if (bind(handle->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { + pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, + errno, "Can't attach to interface"); + goto close_fail; + } + + opt = 1; + if (setsockopt(handle->fd, SOL_SOCKET, SO_TIMESTAMP, &opt, sizeof(opt)) < 0) { + pcap_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, + errno, "Can't enable time stamp"); + goto close_fail; + } + + handle->selectable_fd = handle->fd; + + return 0; + +close_fail: + pcap_cleanup_live_common(handle); + return err; +} + +pcap_t * +bt_monitor_create(const char *device, char *ebuf, int *is_ours) +{ + pcap_t *p; + const char *cp; + + cp = strrchr(device, '/'); + if (cp == NULL) + cp = device; + + if (strcmp(cp, INTERFACE_NAME) != 0) { + *is_ours = 0; + return NULL; + } + + *is_ours = 1; + p = pcap_create_common(ebuf, 0); + if (p == NULL) + return NULL; + + p->activate_op = bt_monitor_activate; + + return p; +} |