Older Linux kernels have different member names for "struct

usbdevfs_ctrltransfer"; check for that and handle it.

Don't declare variables in the middle of a block; some versions of GCC
appear to warn about that.

config.h.in

@@ -154,6 +154,9 @@
 /* Define to 1 if you have the <unistd.h> header file. */
 #undef HAVE_UNISTD_H
 
+/* if struct usbdevfs_ctrltransfer has bRequestType */
+#undef HAVE_USBDEVFS_CTRLTRANSFER_BREQUESTTYPE
+
 /* define if version.h is generated in the build procedure */
 #undef HAVE_VERSION_H
 

configure

@@ -9481,6 +9481,72 @@ fi
 
 done
 
+       if test "$ac_cv_header_linux_usbdevice_fs_h" = yes; then
+         #
+         # OK, does it define bRequestType?  Older versions of the kernel
+         # define fields with names like "requesttype, "request", and
+         # "value", rather than "bRequestType", "bRequest", and
+         # "wValue".
+         #
+         { echo "$as_me:$LINENO: checking if usbdevfs_ctrltransfer struct has bRequestType member" >&5
+echo $ECHO_N "checking if usbdevfs_ctrltransfer struct has bRequestType member... $ECHO_C" >&6; }
+         if test "${ac_cv_usbdevfs_ctrltransfer_has_bRequestType+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+#            include <linux/usbdevice_fs.h>
+int
+main ()
+{
+u_int i = sizeof(((struct usbdevfs_ctrltransfer *)0)->bRequestType)
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext
+if { (ac_try="$ac_compile"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_compile") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest.$ac_objext; then
+  ac_cv_usbdevfs_ctrltransfer_has_bRequestType=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	ac_cv_usbdevfs_ctrltransfer_has_bRequestType=no
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+
+         { echo "$as_me:$LINENO: result: $ac_cv_usbdevfs_ctrltransfer_has_bRequestType" >&5
+echo "${ECHO_T}$ac_cv_usbdevfs_ctrltransfer_has_bRequestType" >&6; }
+         if test $ac_cv_usbdevfs_ctrltransfer_has_bRequestType = yes ; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_USBDEVFS_CTRLTRANSFER_BREQUESTTYPE 1
+_ACEOF
+
+         fi
+       fi
        ;;
 *)
        { echo "$as_me:$LINENO: result: no" >&5

configure.in

@@ -1117,6 +1117,26 @@ linux*)
        AC_DEFINE_UNQUOTED(LINUX_USB_MON_DEV, "/dev/$ac_usb_dev_name", [path for device for USB sniffing])
        AC_MSG_NOTICE(Device for USB sniffing is /dev/$ac_usb_dev_name)
        AC_CHECK_HEADERS(linux/usbdevice_fs.h)
+       if test "$ac_cv_header_linux_usbdevice_fs_h" = yes; then
+         #
+         # OK, does it define bRequestType?  Older versions of the kernel
+         # define fields with names like "requesttype, "request", and
+         # "value", rather than "bRequestType", "bRequest", and
+         # "wValue".
+         #
+         AC_MSG_CHECKING(if usbdevfs_ctrltransfer struct has bRequestType member)
+         AC_CACHE_VAL(ac_cv_usbdevfs_ctrltransfer_has_bRequestType,
+           AC_TRY_COMPILE([
+#            include <linux/usbdevice_fs.h>],
+             [u_int i = sizeof(((struct usbdevfs_ctrltransfer *)0)->bRequestType)],
+             ac_cv_usbdevfs_ctrltransfer_has_bRequestType=yes,
+             ac_cv_usbdevfs_ctrltransfer_has_bRequestType=no))
+         AC_MSG_RESULT($ac_cv_usbdevfs_ctrltransfer_has_bRequestType)
+         if test $ac_cv_usbdevfs_ctrltransfer_has_bRequestType = yes ; then
+	    AC_DEFINE(HAVE_USBDEVFS_CTRLTRANSFER_BREQUESTTYPE,1,
+              [if struct usbdevfs_ctrltransfer has bRequestType])
+         fi
+       fi
        ;;
 *)
        AC_MSG_RESULT(no)

pcap-usb-linux.c

@@ -247,11 +247,23 @@ probe_devices(int bus)
 		if (fd == -1)
 			continue;
 
+		/*
+		 * Sigh.  Different kernels have different member names
+		 * for this structure.
+		 */
+#ifdef HAVE_USBDEVFS_CTRLTRANSFER_BREQUESTTYPE
 		ctrl.bRequestType = USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE;
 		ctrl.bRequest = USB_REQ_GET_DESCRIPTOR;
 		ctrl.wValue = USB_DT_DEVICE << 8;
 		ctrl.wIndex = 0;
  		ctrl.wLength = sizeof(buf);
+#else
+		ctrl.requesttype = USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE;
+		ctrl.request = USB_REQ_GET_DESCRIPTOR;
+		ctrl.value = USB_DT_DEVICE << 8;
+		ctrl.index = 0;
+ 		ctrl.length = sizeof(buf);
+#endif
 		ctrl.data = buf;
 		ctrl.timeout = CTRL_TIMEOUT;
 
@@ -593,9 +605,10 @@ usb_stats_linux(pcap_t *handle, struct pcap_stat *stats)
 	char string[USB_LINE_LEN];
 	char token[USB_LINE_LEN];
 	char * ptr = string;
-	snprintf(string, USB_LINE_LEN, USB_TEXT_DIR"/%ds", handle->md.ifindex);
+	int fd;
 
-	int fd = open(string, O_RDONLY, 0);
+	snprintf(string, USB_LINE_LEN, USB_TEXT_DIR"/%ds", handle->md.ifindex);
+	fd = open(string, O_RDONLY, 0);
 	if (fd < 0)
 	{
 		snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
@@ -626,8 +639,10 @@ usb_stats_linux(pcap_t *handle, struct pcap_stat *stats)
 		 * of  execution" but the Corrigendum seems to contradict this.
 		 * Do not make any assumptions on the effect of %n conversions 
 		 * on the return value and explicitly check for cnt assignmet*/
+		int ntok;
+
 		cnt = -1;
-		int ntok = sscanf(ptr, "%s%n", token, &cnt);
+		ntok = sscanf(ptr, "%s%n", token, &cnt);
 		if ((ntok < 1) || (cnt < 0))
 			break;
 		consumed += cnt;