If we have pcap_open, call it instead of pcap_open_live, otherwise we might
[obnox/wireshark/wip.git] / capture.c
index 4e704273fafc4fb2512d3c0b8c240b7a4921c75e..b93fcc1a22df8e85791d274d5579578e13778917 100644 (file)
--- a/capture.c
+++ b/capture.c
@@ -3,8 +3,8 @@
  *
  * $Id$
  *
- * Ethereal - Network traffic analyzer
- * By Gerald Combs <gerald@ethereal.com>
+ * 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
 
 #ifdef HAVE_LIBPCAP
 
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>
 #include <fcntl.h>
 #endif
 
-#ifdef HAVE_IO_H
-# include <io.h>
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>         /* needed to define AF_ values on UNIX */
+#endif
+
+#ifdef HAVE_WINSOCK2_H
+#include <winsock2.h>           /* needed to define AF_ values on Windows */
+#endif
+
+#ifdef NEED_INET_V6DEFS_H
+# include "inet_v6defs.h"
 #endif
 
 #include <signal.h>
 #include <errno.h>
 
-#include <pcap.h>
-
 #include <glib.h>
 
 #include <epan/packet.h>
 #include "file.h"
 #include "capture.h"
 #include "capture_sync.h"
+#include "capture_info.h"
 #include "capture_ui_utils.h"
 #include "util.h"
-#include "pcap-util.h"
+#include "capture-pcap-util.h"
 #include "alert_box.h"
 #include "simple_dialog.h"
 #include <epan/prefs.h>
-#include "conditions.h"
-#include "ringbuffer.h"
 
 #ifdef _WIN32
 #include "capture-wpcap.h"
 #endif
 #include "ui_util.h"
+#include "file_util.h"
+#include "log.h"
 
+typedef struct if_stat_cache_item_s {
+    char *name;
+    struct pcap_stat ps;
+} if_stat_cache_item_t;
 
+struct if_stat_cache_s {
+    int stat_fd;
+    int fork_child;
+    GList *cache_list;  /* List of if_stat_chache_entry_t */
+};
 
-/** 
+/**
  * Start a capture.
  *
  * @return TRUE if the capture starts successfully, FALSE otherwise.
@@ -82,23 +118,70 @@ capture_start(capture_options *capture_opts)
   /* close the currently loaded capture file */
   cf_close(capture_opts->cf);
 
-  /* try to start the capture child process */
-  ret = sync_pipe_do_capture(capture_opts, capture_opts->save_file == NULL);
+  g_assert(capture_opts->state == CAPTURE_STOPPED);
+  capture_opts->state = CAPTURE_PREPARING;
 
-  if(ret) {
-      /* tell callbacks (menu, ...) that capture is running now */
-      cf_callback_invoke(cf_cb_live_capture_prepare, capture_opts);
-  } else {
+  g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Start ...");
+
+  /* try to start the capture child process */
+  ret = sync_pipe_start(capture_opts);
+  if(!ret) {
       if(capture_opts->save_file != NULL) {
           g_free(capture_opts->save_file);
           capture_opts->save_file = NULL;
       }
+
+      g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Start failed!");
+      capture_opts->state = CAPTURE_STOPPED;
+  } else {
+      /* the capture child might not respond shortly after bringing it up */
+      /* (especially it will block, if no input coming from an input capture pipe (e.g. mkfifo) is coming in) */
+
+      /* to prevent problems, bring the main GUI into "capture mode" right after successfully */
+      /* spawn/exec the capture child, without waiting for any response from it */
+      cf_callback_invoke(cf_cb_live_capture_prepared, capture_opts);
+
+      if(capture_opts->show_info)
+        capture_info_open(capture_opts->iface);
   }
 
   return ret;
 }
 
 
+void
+capture_stop(capture_options *capture_opts)
+{
+  g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Stop ...");
+
+  cf_callback_invoke(cf_cb_live_capture_stopping, capture_opts);
+
+  /* stop the capture child gracefully */
+  sync_pipe_stop(capture_opts);
+}
+
+
+void
+capture_restart(capture_options *capture_opts)
+{
+    g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Restart");
+
+    capture_opts->restart = TRUE;
+    capture_stop(capture_opts);
+}
+
+
+void
+capture_kill_child(capture_options *capture_opts)
+{
+  g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_INFO, "Capture Kill");
+
+  /* kill the capture child */
+  sync_pipe_kill(capture_opts->fork_child);
+}
+
+
+
 /* We've succeeded a (non real-time) capture, try to read it into a new capture file */
 static gboolean
 capture_input_read_all(capture_options *capture_opts, gboolean is_tempfile, gboolean drops_known,
@@ -161,17 +244,29 @@ guint32 drops)
     break;
 
   case CF_READ_ABORTED:
-    /* User wants to quit program. Exit by leaving the main loop, 
+    /* User wants to quit program. Exit by leaving the main loop,
        so that any quit functions we registered get called. */
     main_window_nested_quit();
     return FALSE;
   }
 
   /* if we didn't captured even a single packet, close the file again */
-  if(cf_packet_count(capture_opts->cf) == 0) {
-    simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK, 
-    "%sNo packets captured!%s\n\n"
-    "As no data was captured, closing the %scapture file!",
+  if(cf_get_packet_count(capture_opts->cf) == 0 && !capture_opts->restart) {
+    simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK,
+"%sNo packets captured!%s\n"
+"\n"
+"As no data was captured, closing the %scapture file!\n"
+"\n"
+"\n"
+"Help about capturing can be found at:\n"
+"\n"
+"       http://wiki.wireshark.org/CaptureSetup"
+#ifdef _WIN32
+"\n\n"
+"Wireless (Wi-Fi/WLAN):\n"
+"Try to switch off promiscuous mode in the Capture Options!"
+#endif
+"",
     simple_dialog_primary_start(), simple_dialog_primary_end(),
     (cf_is_tempfile(capture_opts->cf)) ? "temporary " : "");
     cf_close(capture_opts->cf);
@@ -180,7 +275,7 @@ guint32 drops)
 }
 
 
-/* capture child tells us, we have a new (or the first) capture file */
+/* capture child tells us we have a new (or the first) capture file */
 gboolean
 capture_input_new_file(capture_options *capture_opts, gchar *new_file)
 {
@@ -188,16 +283,25 @@ capture_input_new_file(capture_options *capture_opts, gchar *new_file)
   int  err;
 
 
-  /*g_warning("New capture file: %s", new_file);*/
+  if(capture_opts->state == CAPTURE_PREPARING) {
+    g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture started!");
+  }
+  g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "File: \"%s\"", new_file);
+
+  g_assert(capture_opts->state == CAPTURE_PREPARING || capture_opts->state == CAPTURE_RUNNING);
 
   /* free the old filename */
   if(capture_opts->save_file != NULL) {
-    /* we start a new capture file, simply close the old one */
-    /* XXX - is it enough to call cf_close here? */
-    /* XXX - is it safe to call cf_close even if the file is close before? */
-    cf_close(capture_opts->cf);
+    /* we start a new capture file, close the old one (if we had one before) */
+    /* (we can only have an open capture file in real_time_mode!) */
+    if( ((capture_file *) capture_opts->cf)->state != FILE_CLOSED) {
+        cf_callback_invoke(cf_cb_live_capture_update_finished, capture_opts->cf);
+        cf_finish_tail(capture_opts->cf, &err);
+        cf_close(capture_opts->cf);
+    }
     g_free(capture_opts->save_file);
     is_tempfile = FALSE;
+    cf_set_tempfile(capture_opts->cf, FALSE);
   } else {
     /* we didn't had a save_file before, must be a tempfile */
     is_tempfile = TRUE;
@@ -210,36 +314,45 @@ capture_input_new_file(capture_options *capture_opts, gchar *new_file)
   /* if we are in real-time mode, open the new file now */
   if(capture_opts->real_time_mode) {
     /* Attempt to open the capture file and set up to read from it. */
-       switch(cf_start_tail(capture_opts->cf, capture_opts->save_file, is_tempfile, &err)) {
+    switch(cf_start_tail(capture_opts->cf, capture_opts->save_file, is_tempfile, &err)) {
     case CF_OK:
       break;
     case CF_ERROR:
-      /* Don't unlink (delete) the save file - leave it around, 
+      /* Don't unlink (delete) the save file - leave it around,
          for debugging purposes. */
       g_free(capture_opts->save_file);
       capture_opts->save_file = NULL;
       return FALSE;
-      break;
     }
   }
 
-  cf_callback_invoke(cf_cb_live_capture_started, capture_opts->cf);
+  if(capture_opts->show_info) {
+    if (!capture_info_new_file(new_file))
+      return FALSE;
+  }
+
+  if(capture_opts->real_time_mode) {
+    cf_callback_invoke(cf_cb_live_capture_update_started, capture_opts);
+  } else {
+    cf_callback_invoke(cf_cb_live_capture_fixed_started, capture_opts);
+  }
+  capture_opts->state = CAPTURE_RUNNING;
 
   return TRUE;
 }
 
-    
-/* capture child tells us, we have new packets to read */
+
+/* capture child tells us we have new packets to read */
 void
 capture_input_new_packets(capture_options *capture_opts, int to_read)
 {
   int  err;
 
 
+  g_assert(capture_opts->save_file);
+
   if(capture_opts->real_time_mode) {
-    /* Read from the capture file the number of records the child told us
-       it added.
-       XXX - do something if this fails? */
+    /* Read from the capture file the number of records the child told us it added. */
     switch (cf_continue_tail(capture_opts->cf, to_read, &err)) {
 
     case CF_READ_OK:
@@ -249,6 +362,7 @@ capture_input_new_packets(capture_options *capture_opts, int to_read)
          file.
 
          XXX - abort on a read error? */
+         cf_callback_invoke(cf_cb_live_capture_update_continue, capture_opts->cf);
       break;
 
     case CF_READ_ABORTED:
@@ -257,27 +371,172 @@ capture_input_new_packets(capture_options *capture_opts, int to_read)
       capture_kill_child(capture_opts);
       break;
     }
+  } else {
+    /* increase capture file packet counter by the number or incoming packets */
+    cf_set_packet_count(capture_opts->cf,
+        cf_get_packet_count(capture_opts->cf) + to_read);
+
+    cf_callback_invoke(cf_cb_live_capture_fixed_continue, capture_opts->cf);
+  }
+
+  /* update the main window, so we get events (e.g. from the stop toolbar button) */
+  main_window_update();
+
+  if(capture_opts->show_info)
+    capture_info_new_packets(to_read);
+}
+
+
+/* Capture child told us how many dropped packets it counted.
+ */
+void
+capture_input_drops(capture_options *capture_opts, int dropped)
+{
+  g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_INFO, "%d packet%s dropped", dropped, plurality(dropped, "", "s"));
+
+  g_assert(capture_opts->state == CAPTURE_RUNNING);
+
+  cf_set_drops_known(capture_opts->cf, TRUE);
+  cf_set_drops(capture_opts->cf, dropped);
+}
+
+
+/* Capture child told us that an error has occurred while starting/running
+   the capture.
+   The buffer we're handed has *two* null-terminated strings in it - a
+   primary message and a secondary message, one right after the other.
+   The secondary message might be a null string.
+ */
+void
+capture_input_error_message(capture_options *capture_opts, char *error_msg, char *secondary_error_msg)
+{
+  gchar *safe_error_msg;
+  gchar *safe_secondary_error_msg;
+
+  g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Error message from child: \"%s\", \"%s\"",
+        error_msg, secondary_error_msg);
+
+  g_assert(capture_opts->state == CAPTURE_PREPARING || capture_opts->state == CAPTURE_RUNNING);
+
+  safe_error_msg = simple_dialog_format_message(error_msg);
+  if (*secondary_error_msg != '\0') {
+    /* We have both primary and secondary messages. */
+    safe_secondary_error_msg = simple_dialog_format_message(secondary_error_msg);
+    simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "%s%s%s\n\n%s",
+                  simple_dialog_primary_start(), safe_error_msg,
+                  simple_dialog_primary_end(), safe_secondary_error_msg);
+    g_free(safe_secondary_error_msg);
+  } else {
+    /* We have only a primary message. */
+    simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "%s%s%s",
+                  simple_dialog_primary_start(), safe_error_msg,
+                  simple_dialog_primary_end());
+  }
+  g_free(safe_error_msg);
+
+  /* the capture child will close the sync_pipe if required, nothing to do for now */
+}
+
+
+
+/* Capture child told us that an error has occurred while parsing a
+   capture filter when starting/running the capture.
+ */
+void
+capture_input_cfilter_error_message(capture_options *capture_opts, char *error_message)
+{
+  dfilter_t   *rfcode = NULL;
+  gchar *safe_cfilter = simple_dialog_format_message(capture_opts->cfilter);
+  gchar *safe_cfilter_error_msg = simple_dialog_format_message(error_message);
+
+  g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture filter error message from child: \"%s\"", error_message);
+
+  g_assert(capture_opts->state == CAPTURE_PREPARING || capture_opts->state == CAPTURE_RUNNING);
+
+  /* Did the user try a display filter? */
+  if (dfilter_compile(capture_opts->cfilter, &rfcode) && rfcode != NULL) {
+    simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
+      "%sInvalid capture filter: \"%s\"!%s\n"
+      "\n"
+      "That string looks like a valid display filter; however, it isn't a valid\n"
+      "capture filter (%s).\n"
+      "\n"
+      "Note that display filters and capture filters don't have the same syntax,\n"
+      "so you can't use most display filter expressions as capture filters.\n"
+      "\n"
+      "See the User's Guide for a description of the capture filter syntax.",
+      simple_dialog_primary_start(), safe_cfilter,
+      simple_dialog_primary_end(), safe_cfilter_error_msg);
+      dfilter_free(rfcode);
+  } else {
+    simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
+      "%sInvalid capture filter: \"%s\"!%s\n"
+      "\n"
+      "That string isn't a valid capture filter (%s).\n"
+      "See the User's Guide for a description of the capture filter syntax.",
+      simple_dialog_primary_start(), safe_cfilter,
+      simple_dialog_primary_end(), safe_cfilter_error_msg);
   }
+  g_free(safe_cfilter_error_msg);
+  g_free(safe_cfilter);
+
+  /* the capture child will close the sync_pipe if required, nothing to do for now */
 }
 
 
-/* capture child closed it's side ot the pipe, do the required cleanup */
+/* capture child closed its side of the pipe, do the required cleanup */
 void
 capture_input_closed(capture_options *capture_opts)
 {
     int  err;
-
+    int  packet_count_save;
+
+    g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture stopped!");
+    g_assert(capture_opts->state == CAPTURE_PREPARING || capture_opts->state == CAPTURE_RUNNING);
+
+    /* if we didn't started the capture, do a fake start */
+    /* (happens if we got an error message - we won't get a filename then) */
+    if(capture_opts->state == CAPTURE_PREPARING) {
+        if(capture_opts->real_time_mode) {
+            cf_callback_invoke(cf_cb_live_capture_update_started, capture_opts);
+        } else {
+            cf_callback_invoke(cf_cb_live_capture_fixed_started, capture_opts);
+        }
+    }
 
     if(capture_opts->real_time_mode) {
-        /* Read what remains of the capture file, and finish the capture.
-           XXX - do something if this fails? */
-        switch (cf_finish_tail(capture_opts->cf, &err)) {
+       cf_read_status_t status;
+
+        /* Read what remains of the capture file. */
+        status = cf_finish_tail(capture_opts->cf, &err);
+
+        /* XXX: If -Q (quit-after-cap) then cf->count clr'd below so save it first */
+       packet_count_save = cf_get_packet_count(capture_opts->cf);
+        /* Tell the GUI, we are not doing a capture any more.
+                  Must be done after the cf_finish_tail(), so file lengths are displayed
+                  correct. */
+        cf_callback_invoke(cf_cb_live_capture_update_finished, capture_opts->cf);
+
+        /* Finish the capture. */
+        switch (status) {
 
         case CF_READ_OK:
-            if(cf_packet_count(capture_opts->cf) == 0) {
-              simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK, 
-              "%sNo packets captured!%s\n\n"
-              "As no data was captured, closing the %scapture file!",
+            if ((packet_count_save == 0) && !capture_opts->restart) {
+                simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK,
+"%sNo packets captured!%s\n"
+"\n"
+"As no data was captured, closing the %scapture file!\n"
+"\n"
+"\n"
+"Help about capturing can be found at:\n"
+"\n"
+"       http://wiki.wireshark.org/CaptureSetup"
+#ifdef _WIN32
+"\n\n"
+"Wireless (Wi-Fi/WLAN):\n"
+"Try to switch off promiscuous mode in the Capture Options!"
+#endif
+"",
               simple_dialog_primary_start(), simple_dialog_primary_end(),
               cf_is_tempfile(capture_opts->cf) ? "temporary " : "");
               cf_close(capture_opts->cf);
@@ -296,33 +555,312 @@ capture_input_closed(capture_options *capture_opts)
         }
 
     } else {
-        /* this is a normal mode capture, read in the capture file data */
-        capture_input_read_all(capture_opts, cf_is_tempfile(capture_opts->cf), 
-            cf_get_drops_known(capture_opts->cf), cf_get_drops(capture_opts->cf));
+        /* first of all, we are not doing a capture any more */
+        cf_callback_invoke(cf_cb_live_capture_fixed_finished, capture_opts->cf);
+
+        /* this is a normal mode capture and if no error happened, read in the capture file data */
+        if(capture_opts->save_file != NULL) {
+            capture_input_read_all(capture_opts, cf_is_tempfile(capture_opts->cf),
+                cf_get_drops_known(capture_opts->cf), cf_get_drops(capture_opts->cf));
+        }
     }
 
-    cf_callback_invoke(cf_cb_live_capture_finished, capture_opts->cf);
+    if(capture_opts->show_info)
+      capture_info_close();
 
-    /* We're not doing a capture any more, so we don't have a save file. */
-    g_assert(capture_opts->save_file);
-    g_free(capture_opts->save_file);
-    capture_opts->save_file = NULL;
+    capture_opts->state = CAPTURE_STOPPED;
+
+    /* if we couldn't open a capture file, there's nothing more for us to do */
+    if(capture_opts->save_file == NULL) {
+        cf_close(capture_opts->cf);
+        return;
+    }
+
+    /* does the user wants to restart the current capture? */
+    if(capture_opts->restart) {
+        capture_opts->restart = FALSE;
+
+        eth_unlink(capture_opts->save_file);
+
+        /* if it was a tempfile, throw away the old filename (so it will become a tempfile again) */
+        if(cf_is_tempfile(capture_opts->cf)) {
+            g_free(capture_opts->save_file);
+            capture_opts->save_file = NULL;
+        }
+
+        /* ... and start the capture again */
+        capture_start(capture_opts);
+    } else {
+        /* We're not doing a capture any more, so we don't have a save file. */
+        g_free(capture_opts->save_file);
+        capture_opts->save_file = NULL;
+    }
 }
 
+/**
+ * Fetch the interface list from a child process (dumpcap).
+ *
+ * @return A GList containing if_info_t structs if successful, NULL otherwise.
+ */
 
-void
-capture_stop(capture_options *capture_opts)
+/* XXX - We parse simple text output to get our interface list.  Should
+ * we use "real" data serialization instead, e.g. via XML? */
+GList *
+capture_interface_list(int *err, char **err_str)
 {
-  /* stop the capture child gracefully, if we have one */
-  sync_pipe_stop(capture_opts);
+    GList     *if_list = NULL;
+    int        i, j;
+    gchar     *msg;
+    gchar    **raw_list, **if_parts, **addr_parts;
+    gchar     *name;
+    if_info_t *if_info;
+    if_addr_t *if_addr;
+
+    g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface List ...");
+
+    /* Try to get our interface list */
+    *err = sync_interface_list_open(&msg);
+    if (*err != 0) {
+        g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface List failed!");
+        if (err_str) {
+            if (*err_str)
+                *err_str = msg;
+            else
+                g_free(msg);
+        } else {
+            g_free(msg);
+        }
+        return NULL;
+    }
+
+    /* Split our lines */
+    raw_list = g_strsplit(msg, "\n", 0);
+    g_free(msg);
+
+    for (i = 0; raw_list[i] != NULL; i++) {
+        if_parts = g_strsplit(raw_list[i], "\t", 4);
+        if (if_parts[0] == NULL || if_parts[1] == NULL || if_parts[2] == NULL ||
+                if_parts[3] == NULL) {
+            g_strfreev(if_parts);
+            continue;
+        }
+
+        /* Number followed by the name, e.g "1. eth0" */
+        name = strchr(if_parts[0], ' ');
+        if (name) {
+            name++;
+        } else {
+            g_strfreev(if_parts);
+            continue;
+        }
+
+        if_info = g_malloc0(sizeof(if_info_t));
+        if_info->name = g_strdup(name);
+        if (strlen(if_parts[1]) > 0)
+            if_info->description = g_strdup(if_parts[1]);
+        addr_parts = g_strsplit(if_parts[2], ",", 0);
+        for (j = 0; addr_parts[j] != NULL; j++) {
+            if_addr = g_malloc0(sizeof(if_addr_t));
+            if (inet_pton(AF_INET, addr_parts[j], &if_addr->ip_addr.ip4_addr)) {
+                if_addr->type = AT_IPv4;
+            } else if (inet_pton(AF_INET6, addr_parts[j],
+                    &if_addr->ip_addr.ip6_addr)) {
+                if_addr->type = AT_IPv6;
+            } else {
+                g_free(if_addr);
+                if_addr = NULL;
+            }
+            if (if_addr) {
+                if_info->ip_addr = g_slist_append(if_info->ip_addr, if_addr);
+            }
+        }
+        if (strcmp(if_parts[3], "loopback") == 0)
+            if_info->loopback = TRUE;
+        g_strfreev(if_parts);
+        g_strfreev(addr_parts);
+        if_list = g_list_append(if_list, if_info);
+    }
+    g_strfreev(raw_list);
+
+    /* Check to see if we built a list */
+    if (if_list == NULL) {
+        if (err_str && *err_str)
+            *err_str = g_strdup("No interfaces found");
+        *err = NO_INTERFACES_FOUND;
+    }
+    return if_list;
 }
 
-void
-capture_kill_child(capture_options *capture_opts)
+/* XXX - We parse simple text output to get our interface list.  Should
+ * we use "real" data serialization instead, e.g. via XML? */
+GList *
+capture_pcap_linktype_list(const gchar *ifname, char **err_str)
 {
-  /* kill the capture child, if we have one */
-  sync_pipe_kill(capture_opts);
+    GList     *linktype_list = NULL;
+    int        err, i;
+    gchar     *msg;
+    gchar    **raw_list, **lt_parts;
+    data_link_info_t *data_link_info;
+
+    g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface List ...");
+
+    /* Try to get our interface list */
+    err = sync_linktype_list_open(ifname, &msg);
+    if (err != 0) {
+        g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface List failed!");
+        if (err_str) {
+            *err_str = msg;
+        } else {
+            g_free(msg);
+        }
+        return NULL;
+    }
+
+    /* Split our lines */
+    raw_list = g_strsplit(msg, "\n", 0);
+    g_free(msg);
+
+    for (i = 0; raw_list[i] != NULL; i++) {
+        /* ...and what if the interface name has a tab in it, Mr. Clever Programmer? */
+        lt_parts = g_strsplit(raw_list[i], "\t", 3);
+        if (lt_parts[0] == NULL || lt_parts[1] == NULL || lt_parts[2] == NULL) {
+            g_strfreev(lt_parts);
+            continue;
+        }
+
+        data_link_info = g_malloc(sizeof (data_link_info_t));
+        data_link_info->dlt = (int) strtol(lt_parts[0], NULL, 10);
+        data_link_info->name = g_strdup(lt_parts[1]);
+        if (strcmp(lt_parts[2], "(not supported)") != 0)
+            data_link_info->description = g_strdup(lt_parts[2]);
+        else
+            data_link_info->description = NULL;
+
+        linktype_list = g_list_append(linktype_list, data_link_info);
+    }
+    g_strfreev(raw_list);
+
+    /* Check to see if we built a list */
+    if (linktype_list == NULL) {
+        if (err_str)
+            *err_str = NULL;
+    }
+    return linktype_list;
+}
+
+if_stat_cache_t *
+capture_stat_start(GList *if_list) {
+    int stat_fd, fork_child;
+    gchar *msg;
+    if_stat_cache_t *sc = NULL;
+    GList *if_entry;
+    if_info_t *if_info;
+    if_stat_cache_item_t *sc_item;
+
+    /* Fire up dumpcap. */
+    /*
+     * XXX - on systems with BPF, the number of BPF devices limits the
+     * number of devices on which you can capture simultaneously.
+     *
+     * This means that
+     *
+     * 1) this might fail if you run out of BPF devices
+     *
+     * and
+     *
+     * 2) opening every interface could leave too few BPF devices
+     *    for *other* programs.
+     *
+     * It also means the system could end up getting a lot of traffic
+     * that it has to pass through the networking stack and capture
+     * mechanism, so opening all the devices and presenting packet
+     * counts might not always be a good idea.
+     */
+     if (sync_interface_stats_open(&stat_fd, &fork_child, &msg) == 0) {
+        sc = g_malloc(sizeof(if_stat_cache_t));
+        sc->stat_fd = stat_fd;
+        sc->fork_child = fork_child;
+        sc->cache_list = NULL;
+
+        /* Initialize the cache */
+        for (if_entry = if_list; if_entry != NULL; if_entry = g_list_next(if_entry)) {
+            if_info = if_entry->data;
+            sc_item = g_malloc0(sizeof(if_stat_cache_item_t));
+            sc_item->name = g_strdup(if_info->name);
+            sc->cache_list = g_list_append(sc->cache_list, sc_item);
+        }
+    }
+    return sc;
 }
 
+#define MAX_STAT_LINE_LEN 500
+
+static void
+capture_stat_cache_update(if_stat_cache_t *sc) {
+    gchar stat_line[MAX_STAT_LINE_LEN];
+    gchar **stat_parts;
+    GList *sc_entry;
+    if_stat_cache_item_t *sc_item;
+
+    if (!sc)
+        return;
+
+    while (sync_pipe_gets_nonblock(sc->stat_fd, stat_line, MAX_STAT_LINE_LEN) > 0) {
+        g_strstrip(stat_line);
+        stat_parts = g_strsplit(stat_line, "\t", 3);
+        if (stat_parts[0] == NULL || stat_parts[1] == NULL ||
+            stat_parts[2] == NULL) {
+            g_strfreev(stat_parts);
+            continue;
+        }
+        for (sc_entry = sc->cache_list; sc_entry != NULL; sc_entry = g_list_next(sc_entry)) {
+            sc_item = sc_entry->data;
+            if (strcmp(sc_item->name, stat_parts[0]) == 0) {
+                sc_item->ps.ps_recv = (u_int) strtoul(stat_parts[1], NULL, 10);
+                sc_item->ps.ps_drop = (u_int) strtoul(stat_parts[2], NULL, 10);
+            }
+        }
+        g_strfreev(stat_parts);
+    }
+}
+
+gboolean
+capture_stats(if_stat_cache_t *sc, char *ifname, struct pcap_stat *ps) {
+    GList *sc_entry;
+    if_stat_cache_item_t *sc_item;
+
+    if (!sc || !ifname || !ps) {
+        return FALSE;
+    }
+
+    capture_stat_cache_update(sc);
+    for (sc_entry = sc->cache_list; sc_entry != NULL; sc_entry = g_list_next(sc_entry)) {
+        sc_item = sc_entry->data;
+        if (strcmp(sc_item->name, ifname) == 0) {
+            memcpy(ps, &sc_item->ps, sizeof(struct pcap_stat));
+            return TRUE;
+        }
+    }
+    return FALSE;
+}
+
+void
+capture_stat_stop(if_stat_cache_t *sc) {
+    GList *sc_entry;
+    if_stat_cache_item_t *sc_item;
+    gchar *msg;
+
+    if (!sc)
+        return;
+
+    sync_interface_stats_close(&sc->stat_fd, &sc->fork_child, &msg);
+
+    for (sc_entry = sc->cache_list; sc_entry != NULL; sc_entry = g_list_next(sc_entry)) {
+        sc_item = sc_entry->data;
+        g_free(sc_item->name);
+        g_free(sc_item);
+    }
+    g_free(sc);
+}
 
 #endif /* HAVE_LIBPCAP */