diff options
Diffstat (limited to 'contrib/libpcap/pcap-bt-linux.c')
| -rw-r--r-- | contrib/libpcap/pcap-bt-linux.c | 453 |
1 files changed, 453 insertions, 0 deletions
diff --git a/contrib/libpcap/pcap-bt-linux.c b/contrib/libpcap/pcap-bt-linux.c new file mode 100644 index 000000000000..2fc51665e4bc --- /dev/null +++ b/contrib/libpcap/pcap-bt-linux.c @@ -0,0 +1,453 @@ +/* + * Copyright (c) 2006 Paolo Abeni (Italy) + * 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. + * + * Bluetooth sniffing API implementation for Linux platform + * By Paolo Abeni <paolo.abeni@email.it> + * + */ + +#include <config.h> + +#include "pcap-int.h" +#include "pcap-bt-linux.h" +#include "pcap/bluetooth.h" +#include "diag-control.h" + +#include <errno.h> +#include <stdlib.h> +#include <unistd.h> +#include <fcntl.h> +#include <string.h> +#include <sys/ioctl.h> +#include <sys/socket.h> +#include <arpa/inet.h> + +#include <bluetooth/bluetooth.h> +#include <bluetooth/hci.h> + +#define BT_IFACE "bluetooth" +#define BT_CTRL_SIZE 128 + +/* forward declaration */ +static int bt_activate(pcap_t *); +static int bt_read_linux(pcap_t *, int , pcap_handler , u_char *); +static int bt_inject_linux(pcap_t *, const void *, int); +static int bt_setdirection_linux(pcap_t *, pcap_direction_t); +static int bt_stats_linux(pcap_t *, struct pcap_stat *); + +/* + * Private data for capturing on Linux Bluetooth devices. + */ +struct pcap_bt { + int dev_id; /* device ID of device we're bound to */ +}; + +int +bt_findalldevs(pcap_if_list_t *devlistp, char *err_str) +{ + struct hci_dev_list_req *dev_list; + struct hci_dev_req *dev_req; + int sock; + unsigned i; + int ret = 0; + + sock = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI); + if (sock < 0) + { + /* if bluetooth is not supported this is not fatal*/ + if (errno == EAFNOSUPPORT) + return 0; + pcapint_fmt_errmsg_for_errno(err_str, PCAP_ERRBUF_SIZE, + errno, "Can't open raw Bluetooth socket"); + return PCAP_ERROR; + } + + dev_list = malloc(HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list)); + if (!dev_list) + { + snprintf(err_str, PCAP_ERRBUF_SIZE, "Can't allocate %zu bytes for Bluetooth device list", + HCI_MAX_DEV * sizeof(*dev_req) + sizeof(*dev_list)); + ret = PCAP_ERROR; + goto done; + } + + /* + * Zero the complete header, which is larger than dev_num because of tail + * padding, to silence Valgrind, which overshoots validating that dev_num + * has been set. + * https://github.com/the-tcpdump-group/libpcap/issues/1083 + * https://bugs.kde.org/show_bug.cgi?id=448464 + */ + memset(dev_list, 0, sizeof(*dev_list)); + dev_list->dev_num = HCI_MAX_DEV; + + if (ioctl(sock, HCIGETDEVLIST, (void *) dev_list) < 0) + { + pcapint_fmt_errmsg_for_errno(err_str, PCAP_ERRBUF_SIZE, + errno, "Can't get Bluetooth device list via ioctl"); + ret = PCAP_ERROR; + goto free; + } + + dev_req = dev_list->dev_req; + for (i = 0; i < dev_list->dev_num; i++, dev_req++) { + char dev_name[20], dev_descr[40]; + + snprintf(dev_name, sizeof(dev_name), BT_IFACE"%u", dev_req->dev_id); + snprintf(dev_descr, sizeof(dev_descr), "Bluetooth adapter number %u", i); + + /* + * Bluetooth is a wireless technology. + * XXX - if there's the notion of associating with a + * network, and we can determine whether the interface + * is associated with a network, check that and set + * the status to PCAP_IF_CONNECTION_STATUS_CONNECTED + * or PCAP_IF_CONNECTION_STATUS_DISCONNECTED. + */ + if (pcapint_add_dev(devlistp, dev_name, PCAP_IF_WIRELESS, dev_descr, err_str) == NULL) + { + ret = PCAP_ERROR; + break; + } + } + +free: + free(dev_list); + +done: + close(sock); + return ret; +} + +pcap_t * +bt_create(const char *device, char *ebuf, int *is_ours) +{ + const char *cp; + char *cpend; + long devnum; + pcap_t *p; + + /* Does this look like a Bluetooth device? */ + cp = strrchr(device, '/'); + if (cp == NULL) + cp = device; + /* Does it begin with BT_IFACE? */ + if (strncmp(cp, BT_IFACE, sizeof BT_IFACE - 1) != 0) { + /* Nope, doesn't begin with BT_IFACE */ + *is_ours = 0; + return NULL; + } + /* Yes - is BT_IFACE followed by a number? */ + cp += sizeof BT_IFACE - 1; + devnum = strtol(cp, &cpend, 10); + if (cpend == cp || *cpend != '\0') { + /* Not followed by a number. */ + *is_ours = 0; + return NULL; + } + if (devnum < 0) { + /* Followed by a non-valid number. */ + *is_ours = 0; + return NULL; + } + + /* OK, it's probably ours. */ + *is_ours = 1; + + p = PCAP_CREATE_COMMON(ebuf, struct pcap_bt); + if (p == NULL) + return (NULL); + + p->activate_op = bt_activate; + return (p); +} + +static int +bt_activate(pcap_t* handle) +{ + struct pcap_bt *handlep = handle->priv; + struct sockaddr_hci addr; + int opt; + int dev_id; + struct hci_filter flt; + int err = PCAP_ERROR; + + /* get bt interface id */ + if (sscanf(handle->opt.device, BT_IFACE"%d", &dev_id) != 1) + { + snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, + "Can't get Bluetooth device index from %s", + handle->opt.device); + return PCAP_ERROR; + } + + /* + * 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; + + /* Initialize some components of the pcap structure. */ + handle->bufsize = BT_CTRL_SIZE+sizeof(pcap_bluetooth_h4_header)+handle->snapshot; + handle->linktype = DLT_BLUETOOTH_HCI_H4_WITH_PHDR; + + handle->read_op = bt_read_linux; + handle->inject_op = bt_inject_linux; + handle->setfilter_op = pcapint_install_bpf_program; /* no kernel filtering */ + handle->setdirection_op = bt_setdirection_linux; + handle->set_datalink_op = NULL; /* can't change data link type */ + handle->getnonblock_op = pcapint_getnonblock_fd; + handle->setnonblock_op = pcapint_setnonblock_fd; + handle->stats_op = bt_stats_linux; + handlep->dev_id = dev_id; + + /* Create HCI socket */ + handle->fd = socket(AF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI); + if (handle->fd < 0) { + pcapint_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) { + pcapint_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, + errno, "Can't allocate dump buffer"); + goto close_fail; + } + + opt = 1; + if (setsockopt(handle->fd, SOL_HCI, HCI_DATA_DIR, &opt, sizeof(opt)) < 0) { + pcapint_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, + errno, "Can't enable data direction info"); + goto close_fail; + } + + opt = 1; + if (setsockopt(handle->fd, SOL_HCI, HCI_TIME_STAMP, &opt, sizeof(opt)) < 0) { + pcapint_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, + errno, "Can't enable time stamp"); + goto close_fail; + } + + /* Setup filter, do not call hci function to avoid dependence on + * external libs */ + memset(&flt, 0, sizeof(flt)); + memset((void *) &flt.type_mask, 0xff, sizeof(flt.type_mask)); + memset((void *) &flt.event_mask, 0xff, sizeof(flt.event_mask)); + if (setsockopt(handle->fd, SOL_HCI, HCI_FILTER, &flt, sizeof(flt)) < 0) { + pcapint_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, + errno, "Can't set filter"); + goto close_fail; + } + + + /* Bind socket to the HCI device */ + addr.hci_family = AF_BLUETOOTH; + addr.hci_dev = handlep->dev_id; +#ifdef HAVE_STRUCT_SOCKADDR_HCI_HCI_CHANNEL + addr.hci_channel = HCI_CHANNEL_RAW; +#endif + if (bind(handle->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { + pcapint_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, + errno, "Can't attach to device %d", handlep->dev_id); + goto close_fail; + } + + if (handle->opt.rfmon) { + /* + * Monitor mode doesn't apply to Bluetooth devices. + */ + err = PCAP_ERROR_RFMON_NOTSUP; + goto close_fail; + } + + if (handle->opt.buffer_size != 0) { + /* + * Set the socket buffer size to the specified value. + */ + if (setsockopt(handle->fd, SOL_SOCKET, SO_RCVBUF, + &handle->opt.buffer_size, + sizeof(handle->opt.buffer_size)) == -1) { + pcapint_fmt_errmsg_for_errno(handle->errbuf, + errno, PCAP_ERRBUF_SIZE, "SO_RCVBUF"); + goto close_fail; + } + } + + handle->selectable_fd = handle->fd; + return 0; + +close_fail: + pcapint_cleanup_live_common(handle); + return err; +} + +static int +bt_read_linux(pcap_t *handle, int max_packets _U_, pcap_handler callback, u_char *user) +{ + struct cmsghdr *cmsg; + struct msghdr msg; + struct iovec iv; + ssize_t ret; + struct pcap_pkthdr pkth; + pcap_bluetooth_h4_header* bthdr; + u_char *pktd; + int in = 0; + + pktd = (u_char *)handle->buffer + BT_CTRL_SIZE; + bthdr = (pcap_bluetooth_h4_header*)(void *)pktd; + iv.iov_base = pktd + sizeof(pcap_bluetooth_h4_header); + iv.iov_len = handle->snapshot; + + memset(&msg, 0, sizeof(msg)); + msg.msg_iov = &iv; + msg.msg_iovlen = 1; + msg.msg_control = handle->buffer; + msg.msg_controllen = BT_CTRL_SIZE; + + /* ignore interrupt system call error */ + do { + if (handle->break_loop) + { + handle->break_loop = 0; + return PCAP_ERROR_BREAK; + } + ret = recvmsg(handle->fd, &msg, 0); + } while ((ret == -1) && (errno == EINTR)); + + if (ret < 0) { + if (errno == EAGAIN || errno == EWOULDBLOCK) { + /* Nonblocking mode, no data */ + return 0; + } + pcapint_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, + errno, "Can't receive packet"); + return PCAP_ERROR; + } + + pkth.caplen = (bpf_u_int32)ret; + + /* get direction and timestamp*/ + cmsg = CMSG_FIRSTHDR(&msg); + while (cmsg) { + switch (cmsg->cmsg_type) { + case HCI_CMSG_DIR: + memcpy(&in, CMSG_DATA(cmsg), sizeof in); + break; + case HCI_CMSG_TSTAMP: + memcpy(&pkth.ts, CMSG_DATA(cmsg), + sizeof pkth.ts); + break; + } + // for musl libc CMSG_NXTHDR() +DIAG_OFF_SIGN_COMPARE + cmsg = CMSG_NXTHDR(&msg, cmsg); +DIAG_ON_SIGN_COMPARE + } + switch (handle->direction) { + + case PCAP_D_IN: + if (!in) + return 0; + break; + + case PCAP_D_OUT: + if (in) + return 0; + break; + + default: + break; + } + + bthdr->direction = htonl(in != 0); + pkth.caplen+=sizeof(pcap_bluetooth_h4_header); + pkth.len = pkth.caplen; + if (handle->fcode.bf_insns == NULL || + pcapint_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_inject_linux(pcap_t *handle, const void *buf _U_, int size _U_) +{ + snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, + "Packet injection is not supported on Bluetooth devices"); + return (-1); +} + + +static int +bt_stats_linux(pcap_t *handle, struct pcap_stat *stats) +{ + struct pcap_bt *handlep = handle->priv; + int ret; + struct hci_dev_info dev_info; + struct hci_dev_stats * s = &dev_info.stat; + dev_info.dev_id = handlep->dev_id; + + /* ignore eintr */ + do { + ret = ioctl(handle->fd, HCIGETDEVINFO, (void *)&dev_info); + } while ((ret == -1) && (errno == EINTR)); + + if (ret < 0) { + pcapint_fmt_errmsg_for_errno(handle->errbuf, PCAP_ERRBUF_SIZE, + errno, "Can't get stats via ioctl"); + return (-1); + + } + + /* we receive both rx and tx frames, so cumulate all stats */ + stats->ps_recv = s->evt_rx + s->acl_rx + s->sco_rx + s->cmd_tx + + s->acl_tx +s->sco_tx; + stats->ps_drop = s->err_rx + s->err_tx; + stats->ps_ifdrop = 0; + return 0; +} + +static int +bt_setdirection_linux(pcap_t *p, pcap_direction_t d) +{ + /* + * It's guaranteed, at this point, that d is a valid + * direction value. + */ + p->direction = d; + return 0; +} |