GOOSE Messages don't use the length field to perform the dissection.
[obnox/wireshark/wip.git] / capture.c
index b5556ce84cccccba34dc1449bbb1f05387610662..715eeac4c22fefdd32c924d40ab9b8389bb2c738 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
 #include <unistd.h>
 #endif
 
-#include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
-#include <ctype.h>
-
-#ifdef HAVE_FCNTL_H
-#include <fcntl.h>
-#endif
-
-#include <signal.h>
-#include <errno.h>
 
 #include <glib.h>
 
 #include <epan/dfilter/dfilter.h>
 #include "file.h"
 #include "capture.h"
+#include "capture_ifinfo.h"
 #include "capture_sync.h"
 #include "capture_info.h"
 #include "capture_ui_utils.h"
 #include "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 "ui/simple_dialog.h"
+#include "ui/ui_util.h"
+
+#include "wsutil/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 */
+};
+
+/* this callback mechanism should possibly be replaced by the g_signal_...() stuff (if I only would know how :-) */
+typedef struct {
+    capture_callback_t cb_fct;
+    gpointer user_data;
+} capture_callback_data_t;
+
+static GList *capture_callbacks = NULL;
+
+static void
+capture_callback_invoke(int event, capture_options *capture_opts)
+{
+  capture_callback_data_t *cb;
+  GList *cb_item = capture_callbacks;
+
+  /* there should be at least one interested */
+  g_assert(cb_item != NULL);
+
+  while(cb_item != NULL) {
+    cb = cb_item->data;
+    cb->cb_fct(event, capture_opts, cb->user_data);
+    cb_item = g_list_next(cb_item);
+  }
+}
+
+
+void
+capture_callback_add(capture_callback_t func, gpointer user_data)
+{
+  capture_callback_data_t *cb;
+
+  cb = g_malloc(sizeof(capture_callback_data_t));
+  cb->cb_fct = func;
+  cb->user_data = user_data;
+
+  capture_callbacks = g_list_append(capture_callbacks, cb);
+}
 
+void
+capture_callback_remove(capture_callback_t func)
+{
+  capture_callback_data_t *cb;
+  GList *cb_item = capture_callbacks;
+
+  while(cb_item != NULL) {
+    cb = cb_item->data;
+    if(cb->cb_fct == func) {
+      capture_callbacks = g_list_remove(capture_callbacks, cb);
+      g_free(cb);
+      return;
+    }
+    cb_item = g_list_next(cb_item);
+  }
+
+  g_assert_not_reached();
+}
 
-/** 
+/**
  * Start a capture.
  *
  * @return TRUE if the capture starts successfully, FALSE otherwise.
@@ -78,16 +135,46 @@ gboolean
 capture_start(capture_options *capture_opts)
 {
   gboolean ret;
+  guint i;
+  GString *source = g_string_new("");
 
+  if (capture_opts->state != CAPTURE_STOPPED)
+    return FALSE;
+  capture_opts->state = CAPTURE_PREPARING;
 
   /* close the currently loaded capture file */
   cf_close(capture_opts->cf);
-
-  g_assert(capture_opts->state == CAPTURE_STOPPED);
-  capture_opts->state = CAPTURE_PREPARING;
-
+  collect_ifaces(capture_opts);
   g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Start ...");
-
+#ifdef _WIN32
+  if (capture_opts->ifaces->len < 2) {
+#else
+  if (capture_opts->ifaces->len < 4) {
+#endif
+    for (i = 0; i < capture_opts->ifaces->len; i++) {
+      interface_options interface_opts;
+
+      interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
+      if (i > 0) {
+          if (capture_opts->ifaces->len > 2) {
+              g_string_append_printf(source, ",");
+          }
+          g_string_append_printf(source, " ");
+          if (i == capture_opts->ifaces->len - 1) {
+              g_string_append_printf(source, "and ");
+          }
+      }
+      g_string_append_printf(source, "%s", get_iface_description_for_interface(capture_opts, i));
+      if ((interface_opts.cfilter != NULL) &&
+          (strlen(interface_opts.cfilter) > 0)) {
+        g_string_append_printf(source, " (%s)", interface_opts.cfilter);
+      }
+    }
+  } else {
+    g_string_append_printf(source, "%u interfaces", capture_opts->ifaces->len);
+  }
+  cf_set_tempfile_source(capture_opts->cf, source->str);
+  g_string_free(source, TRUE);
   /* try to start the capture child process */
   ret = sync_pipe_start(capture_opts);
   if(!ret) {
@@ -100,14 +187,14 @@ capture_start(capture_options *capture_opts)
       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) */
+      /* (for example: it will block if no input arrives from an input capture pipe (e.g. mkfifo)) */
 
-      /* 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);
+      /* to prevent problems, bring the main GUI into "capture mode" right after a successful */
+      /* spawn/exec of the capture child, without waiting for any response from it */
+      capture_callback_invoke(capture_cb_capture_prepared, capture_opts);
 
       if(capture_opts->show_info)
-        capture_info_open(capture_opts->iface);
+        capture_info_open(capture_opts);
   }
 
   return ret;
@@ -119,7 +206,7 @@ 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);
+  capture_callback_invoke(capture_cb_capture_stopping, capture_opts);
 
   /* stop the capture child gracefully */
   sync_pipe_stop(capture_opts);
@@ -142,28 +229,26 @@ 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);
+  sync_pipe_kill(capture_opts->fork_child);
 }
 
 
 
-/* We've succeeded a (non real-time) capture, try to read it into a new capture file */
+/* We've succeeded in doing 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,
 guint32 drops)
 {
   int err;
 
-
   /* Capture succeeded; attempt to open the capture file. */
   if (cf_open(capture_opts->cf, capture_opts->save_file, is_tempfile, &err) != CF_OK) {
-    /* We're not doing a capture any more, so we don't have a save
-       file. */
+    /* We're not doing a capture any more, so we don't have a save file. */
     return FALSE;
   }
-
+  
   /* Set the read filter to NULL. */
-  /* XXX - this is odd here, try to put it somewhere, where it fits better */
+  /* XXX - this is odd here; try to put it somewhere where it fits better */
   cf_set_rfcode(capture_opts->cf, NULL);
 
   /* Get the packet-drop statistics.
@@ -199,7 +284,7 @@ guint32 drops)
   }
 
   /* read in the packet data */
-  switch (cf_read(capture_opts->cf)) {
+  switch (cf_read(capture_opts->cf, FALSE)) {
 
   case CF_READ_OK:
   case CF_READ_ERROR:
@@ -209,15 +294,15 @@ 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 we didn't capture even a single packet, close the file again */
   if(cf_get_packet_count(capture_opts->cf) == 0 && !capture_opts->restart) {
-    simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK, 
+    simple_dialog(ESD_TYPE_INFO, ESD_BTN_OK,
 "%sNo packets captured!%s\n"
 "\n"
 "As no data was captured, closing the %scapture file!\n"
@@ -225,7 +310,7 @@ guint32 drops)
 "\n"
 "Help about capturing can be found at:\n"
 "\n"
-"       http://wiki.ethereal.com/CaptureSetup"
+"       http://wiki.wireshark.org/CaptureSetup"
 #ifdef _WIN32
 "\n\n"
 "Wireless (Wi-Fi/WLAN):\n"
@@ -240,14 +325,13 @@ 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)
 {
   gboolean is_tempfile;
   int  err;
 
-
   if(capture_opts->state == CAPTURE_PREPARING) {
     g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture started!");
   }
@@ -257,10 +341,10 @@ capture_input_new_file(capture_options *capture_opts, gchar *new_file)
 
   /* free the old filename */
   if(capture_opts->save_file != NULL) {
-    /* we start a new capture file, close the old one (if we had one before) */
+    /* 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);
+        capture_callback_invoke(capture_cb_capture_update_finished, capture_opts);
         cf_finish_tail(capture_opts->cf, &err);
         cf_close(capture_opts->cf);
     }
@@ -268,7 +352,7 @@ capture_input_new_file(capture_options *capture_opts, gchar *new_file)
     is_tempfile = FALSE;
     cf_set_tempfile(capture_opts->cf, FALSE);
   } else {
-    /* we didn't had a save_file before, must be a tempfile */
+    /* we didn't have a save_file before; must be a tempfile */
     is_tempfile = TRUE;
     cf_set_tempfile(capture_opts->cf, TRUE);
   }
@@ -279,33 +363,35 @@ 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_update_started, capture_opts);
-  } else {
-    cf_callback_invoke(cf_cb_live_capture_fixed_started, capture_opts);
   }
 
-  if(capture_opts->show_info)
-    capture_info_new_file(new_file);
+  if(capture_opts->show_info) {
+    if (!capture_info_new_file(new_file))
+      return FALSE;
+  }
 
+  if(capture_opts->real_time_mode) {
+    capture_callback_invoke(capture_cb_capture_update_started, capture_opts);
+  } else {
+    capture_callback_invoke(capture_cb_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)
 {
@@ -325,7 +411,7 @@ 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);
+         capture_callback_invoke(capture_cb_capture_update_continue, capture_opts);
       break;
 
     case CF_READ_ABORTED:
@@ -335,14 +421,15 @@ capture_input_new_packets(capture_options *capture_opts, int to_read)
       break;
     }
   } else {
-    /* increase capture file packet counter by the number or incoming packets */
-    cf_set_packet_count(capture_opts->cf, 
+    /* increase the capture file packet counter by the number of incoming packets */
+    cf_set_packet_count(capture_opts->cf,
         cf_get_packet_count(capture_opts->cf) + to_read);
+    cf_fake_continue_tail(capture_opts->cf);
 
-    cf_callback_invoke(cf_cb_live_capture_fixed_continue, capture_opts->cf);
+    capture_callback_invoke(capture_cb_capture_fixed_continue, capture_opts);
   }
 
-  /* update the main window, so we get events (e.g. from the stop toolbar button) */
+  /* update the main window so we get events (e.g. from the stop toolbar button) */
   main_window_update();
 
   if(capture_opts->show_info)
@@ -350,12 +437,12 @@ capture_input_new_packets(capture_options *capture_opts, int to_read)
 }
 
 
-/* Capture child told us, how many dropped packets it counted.
+/* Capture child told us how many dropped packets it counted.
  */
 void
-capture_input_drops(capture_options *capture_opts, int dropped)
+capture_input_drops(capture_options *capture_opts, guint32 dropped)
 {
-  g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_INFO, "%d packet%s dropped", dropped, plurality(dropped, "", "s"));
+  g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_INFO, "%u packet%s dropped", dropped, plurality(dropped, "", "s"));
 
   g_assert(capture_opts->state == CAPTURE_RUNNING);
 
@@ -364,130 +451,337 @@ capture_input_drops(capture_options *capture_opts, int dropped)
 }
 
 
-/* Capture child told us, that an error has occurred while starting/running the capture. */
+/* 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_message)
+capture_input_error_message(capture_options *capture_opts, char *error_msg, char *secondary_error_msg)
 {
-  g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Error message from child: \"%s\"", error_message);
+  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);
 
-  simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "%s", error_message);
+  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 closed it's side ot the pipe, do the required cleanup */
+
+/* Capture child told us that an error has occurred while parsing a
+   capture filter when starting/running the capture.
+ */
 void
-capture_input_closed(capture_options *capture_opts)
+capture_input_cfilter_error_message(capture_options *capture_opts, guint i, char *error_message)
 {
-    int  err;
+  dfilter_t *rfcode = NULL;
+  gchar *safe_cfilter;
+  gchar *safe_descr;
+  gchar *safe_cfilter_error_msg;
+  interface_options interface_opts;
 
+  g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture filter error message from child: \"%s\"", error_message);
 
-    g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture stopped!");
-    g_assert(capture_opts->state == CAPTURE_PREPARING || capture_opts->state == CAPTURE_RUNNING);
+  g_assert(capture_opts->state == CAPTURE_PREPARING || capture_opts->state == CAPTURE_RUNNING);
+  g_assert(i < capture_opts->ifaces->len);
+
+  interface_opts = g_array_index(capture_opts->ifaces, interface_options, i);
+  safe_cfilter = simple_dialog_format_message(interface_opts.cfilter);
+  safe_descr = simple_dialog_format_message(interface_opts.descr);
+  safe_cfilter_error_msg = simple_dialog_format_message(error_message);
+  /* Did the user try a display filter? */
+  if (dfilter_compile(interface_opts.cfilter, &rfcode) && rfcode != NULL) {
+    simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
+      "%sInvalid capture filter \"%s\" for interface %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, safe_descr,
+      simple_dialog_primary_end(), safe_cfilter_error_msg);
+      dfilter_free(rfcode);
+  } else {
+    simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
+      "%sInvalid capture filter \"%s\" for interface %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, safe_descr,
+      simple_dialog_primary_end(), safe_cfilter_error_msg);
+  }
+  g_free(safe_cfilter_error_msg);
+  g_free(safe_descr);
+  g_free(safe_cfilter);
 
-    /* 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);
-        }
-    }
+  /* the capture child will close the sync_pipe if required, nothing to do for now */
+}
+
+
+/* capture child closed its side of the pipe, do the required cleanup */
+void
+capture_input_closed(capture_options *capture_opts, gchar *msg)
+{
+  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 (msg != NULL)
+    simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "%s", msg);
+
+  /* if we didn't start 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_read_status_t status;
+      capture_callback_invoke(capture_cb_capture_update_started, capture_opts);
+    } else {
+      capture_callback_invoke(capture_cb_capture_fixed_started, capture_opts);
+    }
+  }
 
-        /* Read what remains of the capture file. */
-        status = cf_finish_tail(capture_opts->cf, &err);
+  if(capture_opts->real_time_mode) {
+    cf_read_status_t status;
 
-        /* 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);
+    /* Read what remains of the capture file. */
+    status = cf_finish_tail(capture_opts->cf, &err);
 
-        /* Finish the capture. */
-        switch (status) {
+    /* 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 
+       correctly displayed */
+    capture_callback_invoke(capture_cb_capture_update_finished, capture_opts);
 
-        case CF_READ_OK:
-            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.ethereal.com/CaptureSetup"
+    /* Finish the capture. */
+    switch (status) {
+
+    case CF_READ_OK:
+      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!"
+          "\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);
-            }
-            break;
-        case CF_READ_ERROR:
-          /* Just because we got an error, that doesn't mean we were unable
-             to read any of the file; we handle what we could get from the
-             file. */
-          break;
-
-        case CF_READ_ABORTED:
-          /* Exit by leaving the main loop, so that any quit functions
-             we registered get called. */
-          main_window_quit();
-        }
+          "",
+          simple_dialog_primary_start(), simple_dialog_primary_end(),
+          cf_is_tempfile(capture_opts->cf) ? "temporary " : "");
+        cf_close(capture_opts->cf);
+      }
+      break;
+    case CF_READ_ERROR:
+      /* Just because we got an error, that doesn't mean we were unable
+         to read any of the file; we handle what we could get from the
+         file. */
+      break;
 
-    } else {
-        /* 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));
-        }
+    case CF_READ_ABORTED:
+      /* Exit by leaving the main loop, so that any quit functions
+         we registered get called. */
+      main_window_quit();
+      break;
     }
 
-    if(capture_opts->show_info)
-      capture_info_close();
+  } else {
+    /* first of all, we are not doing a capture any more */
+    capture_callback_invoke(capture_cb_capture_fixed_finished, capture_opts);
 
-    capture_opts->state = CAPTURE_STOPPED;
+    /* 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));
+    }
+  }
 
-    /* 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;
+  if(capture_opts->show_info)
+    capture_info_close();
+
+  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;
+
+    ws_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;
     }
 
-    /* does the user wants to restart the current capture? */
-    if(capture_opts->restart) {
-        capture_opts->restart = FALSE;
+    /* ... and start the capture again */
+    if (capture_opts->ifaces->len == 0) {
+      collect_ifaces(capture_opts);
+    }
+    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;
+  }
+}
 
-        eth_unlink(capture_opts->save_file);
+if_stat_cache_t *
+capture_stat_start(capture_options *capture_opts) {
+  int stat_fd, fork_child;
+  gchar *msg;
+  if_stat_cache_t *sc = NULL;
+  if_stat_cache_item_t *sc_item;
+  guint i;
+  interface_t device;
+
+  /* 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 (i = 0; i < capture_opts->all_ifaces->len; i++) {
+      device = g_array_index(capture_opts->all_ifaces, interface_t, i);
+      if (&(device.if_info)) {
+        sc_item = g_malloc0(sizeof(if_stat_cache_item_t));
+        sc_item->name = g_strdup(device.if_info.name);
+        sc->cache_list = g_list_append(sc->cache_list, sc_item);
+      }
+    }
+  }
+  return sc;
+}
 
-        /* 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;
-        }
+#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);
+  }
+}
 
-        /* ... 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;
+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;
+  int ret;
+  gchar *msg;
+
+  if (!sc)
+    return;
+
+  ret = sync_interface_stats_close(&sc->stat_fd, &sc->fork_child, &msg);
+  if (ret == -1) {
+    /* XXX - report failure? */
+    g_free(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 */