Fix building Bluetooth Linux Monitor support with BlueZ 5.1+

Starting from version 5.1 BlueZ no longer exports the mgmt.h header
or any other header that declares the structure of packets passed
over HCI sockets set to use the HCI monitor channel.

Declare the structure locally and give it the same name as in the
Linux kernel 3.4+.

1 files changed, 14 insertions, 4 deletions

diff --git a/pcap-bt-monitor-linux.c b/pcap-bt-monitor-linux.c
index f193e263..b18bdcae 100644
--- a/pcap-bt-monitor-linux.c
+++ b/pcap-bt-monitor-linux.c
@@ -34,12 +34,12 @@
 #endif
 
 #include <errno.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include <bluetooth/bluetooth.h>
 #include <bluetooth/hci.h>
-#include <bluetooth/mgmt.h>
 
 #include "pcap/bluetooth.h"
 #include "pcap-int.h"
@@ -49,6 +49,16 @@
 #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_t **alldevsp, char *err_str)
 {
@@ -72,12 +82,12 @@ bt_monitor_read(pcap_t *handle, int max_packets _U_, pcap_handler callback, u_ch
     ssize_t ret;
     struct pcap_pkthdr pkth;
     pcap_bluetooth_linux_monitor_header *bthdr;
-    struct mgmt_hdr hdr;
+    struct hci_mon_hdr hdr;
 
     bthdr = (pcap_bluetooth_linux_monitor_header*) &handle->buffer[handle->offset];
 
     iv[0].iov_base = &hdr;
-    iv[0].iov_len = MGMT_HDR_SIZE;
+    iv[0].iov_len = sizeof(hdr);
     iv[1].iov_base = &handle->buffer[handle->offset + sizeof(pcap_bluetooth_linux_monitor_header)];
     iv[1].iov_len = handle->snapshot;
 
@@ -103,7 +113,7 @@ bt_monitor_read(pcap_t *handle, int max_packets _U_, pcap_handler callback, u_ch
         return -1;
     }
 
-    pkth.caplen = ret - MGMT_HDR_SIZE + sizeof(pcap_bluetooth_linux_monitor_header);
+    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)) {