Move the routines to talk to dumpcap into a static libcapchild.

This pulls some stuff out of the top-level directory, and means we don't
have to build them once for every program using them.

Change-Id: I37b31fed20f2d5c3563ecd2bae9fd86af70afff5
Reviewed-on: https://code.wireshark.org/review/2591
Reviewed-by: Guy Harris <guy@alum.mit.edu>

1 files changed, 138 insertions, 0 deletions

diff --git a/capchild/capture_sync.h b/capchild/capture_sync.h
new file mode 100644
index 0000000000..2c4bb639af
--- /dev/null
+++ b/capchild/capture_sync.h
@@ -0,0 +1,138 @@
+/* capture_sync.h
+ * Synchronisation between Wireshark capture parent and child instances
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * 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
+ * of the License, or (at your option) any later version.
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+
+/** @file
+ *
+ *  Sync mode capture (internal interface).
+ *
+ *  Will start a new Wireshark child instance which will do the actual capture
+ *  work.
+ */
+
+#ifndef __CAPTURE_SYNC_H__
+#define __CAPTURE_SYNC_H__
+
+/**
+ * Start a new capture session.
+ *  Create a capture child which is doing the real capture work.
+ *  The various capture_input_... functions will be called, if something had
+ *  happened.
+ *
+ *  Most of the parameters are passed through the global capture_opts.
+ *
+ *  @param capture_opts the options
+ *  @param cap_session a handle for the capture session
+ *  @param update_cb update screen
+ *  @return             TRUE if a capture could be started, FALSE if not
+ */
+extern gboolean
+sync_pipe_start(capture_options *capture_opts, capture_session *cap_session, void(*update_cb)(void));
+
+/** User wants to stop capturing, gracefully close the capture child */
+extern void
+sync_pipe_stop(capture_session *cap_session);
+
+/** User wants to stop the program, just kill the child as soon as possible */
+extern void
+sync_pipe_kill(int fork_child);
+
+/** Set wireless channel using dumpcap */
+extern int
+sync_interface_set_80211_chan(const gchar *iface, const char *freq, const gchar *type,
+                              gchar **data, gchar **primary_msg,
+                              gchar **secondary_msg, void (*update_cb)(void));
+
+/** Get an interface list using dumpcap */
+extern int
+sync_interface_list_open(gchar **data, gchar **primary_msg,
+                         gchar **secondary_msg, void (*update_cb)(void));
+
+/** Get interface capabilities using dumpcap */
+extern int
+sync_if_capabilities_open(const gchar *ifname, gboolean monitor_mode,
+                          gchar **data, gchar **primary_msg,
+                          gchar **secondary_msg, void (*update_cb)(void));
+
+/** Start getting interface statistics using dumpcap. */
+extern int
+sync_interface_stats_open(int *read_fd, int *fork_child, gchar **msg, void (*update_cb)(void));
+
+/** Stop gathering statistics. */
+extern int
+sync_interface_stats_close(int *read_fd, int *fork_child, gchar **msg);
+
+/** Read a line from a pipe, similar to fgets.  Non-blocking. */
+extern int
+sync_pipe_gets_nonblock(int pipe_fd, char *bytes, int max);
+
+/*
+ * Routines supplied by our caller; we call them back to notify them
+ * of various events.
+ *
+ * XXX - this is *really* ugly.  We should do this better.
+ */
+
+/**
+ * Capture child told us we have a new (or the first) capture file.
+ */
+extern gboolean
+capture_input_new_file(capture_session *cap_session, gchar *new_file);
+
+/**
+ * Capture child told us we have new packets to read.
+ */
+extern void
+capture_input_new_packets(capture_session *cap_session, int to_read);
+
+/**
+ * Capture child told us how many dropped packets it counted.
+ */
+extern void
+capture_input_drops(capture_session *cap_session, guint32 dropped);
+
+/**
+ * Capture child told us that an error has occurred while starting the capture.
+ */
+extern void
+capture_input_error_message(capture_session *cap_session, char *error_message,
+                            char *secondary_error_msg);
+
+/**
+ * Capture child told us that an error has occurred while parsing a
+ * capture filter when starting/running the capture.
+ */
+extern void
+capture_input_cfilter_error_message(capture_session *cap_session, guint i,
+                                    char *error_message);
+
+/**
+ * Capture child closed its side of the pipe, report any error and
+ * do the required cleanup.
+ */
+extern void
+capture_input_closed(capture_session *cap_session, gchar *msg);
+
+/* set a callback to be called after fork with the pid of the forked child */
+extern void capture_sync_set_fetch_dumpcap_pid_cb(void(*cb)(int pid));
+
+#endif /* capture_sync.h */