gtk/follow_udp.c

   1 /* follow_udp.c
   2  * UDP specific routines for following traffic streams
   3  *
   4  * $Id$
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
  23  * USA.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <gtk/gtk.h>
  29
  30 #include <string.h>
  31
  32 #include <epan/addr_resolv.h>
  33 #include <epan/epan_dissect.h>
  34 #include <epan/follow.h>
  35 #include <epan/ipproto.h>
  36 #include <epan/strutil.h>
  37 #include <epan/tap.h>
  38 #include "follow_stream.h"
  39 #include <globals.h>
  40 #include <gtk/compat_macros.h>
  41 #include <gtk/keys.h>
  42 #include <gtk/main.h>
  43 #include <simple_dialog.h>
  44
  45 #include "follow_udp.h"
  46
  47
  48 static int
  49 udp_queue_packet_data(void *tapdata, packet_info *pinfo,
  50                       epan_dissect_t *edt _U_, const void *data)
  51 {
  52         follow_record_t *follow_record;
  53         follow_info_t *follow_info = tapdata;
  54         const tvbuff_t *next_tvb = data;
  55
  56         follow_record = g_malloc(sizeof(follow_record_t));
  57
  58         follow_record->data = g_byte_array_sized_new(next_tvb->length);
  59         follow_record->data = g_byte_array_append(follow_record->data,
  60                                                   next_tvb->real_data,
  61                                                   next_tvb->length);
  62
  63         if (follow_info->client_port == 0) {
  64                 follow_info->client_port = pinfo->srcport;
  65                 memcpy(follow_info->client_ip, pinfo->src.data, pinfo->src.len);
  66         }
  67
  68         if (memcmp(follow_info->client_ip, pinfo->src.data, pinfo->src.len) ==
  69             0 && follow_info->client_port == pinfo->srcport)
  70                 follow_record->is_server = FALSE;
  71         else
  72                 follow_record->is_server = TRUE;
  73
  74         /* update stream counter */
  75         follow_info->bytes_written[follow_record->is_server] +=
  76                 follow_record->data->len;
  77
  78         follow_info->payload = g_list_append(follow_info->payload,
  79                                              follow_record);
  80         return 0;
  81 }
  82
  83
  84 /* Follow the UDP stream, if any, to which the last packet that we called
  85    a dissection routine on belongs (this might be the most recently
  86    selected packet, or it might be the last packet in the file). */
  87 void
  88 follow_udp_stream_cb(GtkWidget *w, gpointer data _U_)
  89 {
  90         GtkWidget *filter_te;
  91         gchar *follow_filter;
  92         const gchar *previous_filter;
  93         int filter_out_filter_len, previous_filter_len;
  94         const char *hostname0, *hostname1;
  95         char *port0, *port1;
  96         gchar *server_to_client_string = NULL;
  97         gchar *client_to_server_string = NULL;
  98         gchar *both_directions_string = NULL;
  99         follow_stats_t stats;
 100         follow_info_t *follow_info;
 101         GString *msg;
 102
 103         /* we got udp so we can follow */
 104         if(cfile.edt->pi.ipproto != IP_PROTO_UDP) {
 105                 simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
 106                               "Error following stream.  Please make\n"
 107                               "sure you have a UDP packet selected.");
 108                 return;
 109         }
 110
 111         follow_info = g_new0(follow_info_t, 1);
 112         follow_info->follow_type = FOLLOW_UDP;
 113
 114         /* Create a new filter that matches all packets in the UDP stream,
 115            and set the display filter entry accordingly */
 116         follow_filter = build_follow_filter(&cfile.edt->pi);
 117         if (!follow_filter)
 118                 {
 119                         simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
 120                                       "Error creating filter for this stream.\n"
 121                                       "A network layer header is needed");
 122                         return;
 123                 }
 124
 125         /* Set the display filter entry accordingly */
 126         filter_te = OBJECT_GET_DATA(w, E_DFILTER_TE_KEY);
 127
 128         /* needed in follow_filter_out_stream(), is there a better way? */
 129         follow_info->filter_te = filter_te;
 130
 131         /* save previous filter, const since we're not supposed to alter */
 132         previous_filter =
 133                 (const gchar *)gtk_entry_get_text(GTK_ENTRY(filter_te));
 134
 135         /* allocate our new filter. API claims g_malloc terminates program on failure */
 136         /* my calc for max alloc needed is really +10 but when did a few extra bytes hurt ? */
 137         previous_filter_len = previous_filter?strlen(previous_filter):0;
 138         filter_out_filter_len = strlen(follow_filter) + previous_filter_len + 16;
 139         follow_info->filter_out_filter = (gchar *)g_malloc(filter_out_filter_len);
 140
 141         /* append the negation */
 142         if(previous_filter_len) {
 143                 g_snprintf(follow_info->filter_out_filter, filter_out_filter_len,
 144                            "%s and !(%s)", previous_filter, follow_filter);
 145         } else {
 146                 g_snprintf(follow_info->filter_out_filter, filter_out_filter_len,
 147                            "!(%s)", follow_filter);
 148         }
 149
 150         /* data will be passed via tap callback*/
 151         msg = register_tap_listener("udp_follow", follow_info, follow_filter,
 152                                     NULL, udp_queue_packet_data, NULL);
 153         if (msg) {
 154                 simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
 155                               "Can't register udp_follow tap: %s\n",
 156                               msg->str);
 157                 return;
 158         }
 159
 160         gtk_entry_set_text(GTK_ENTRY(filter_te), follow_filter);
 161
 162         /* Run the display filter so it goes in effect - even if it's the
 163            same as the previous display filter. */
 164         main_filter_packets(&cfile, follow_filter, TRUE);
 165
 166         /* Free the filter string, as we're done with it. */
 167         g_free(follow_filter);
 168
 169         remove_tap_listener(follow_info);
 170
 171         /* Stream to show */
 172         follow_stats(&stats);
 173
 174         if (stats.is_ipv6) {
 175                 struct e_in6_addr ipaddr;
 176                 memcpy(&ipaddr, stats.ip_address[0], 16);
 177                 hostname0 = get_hostname6(&ipaddr);
 178                 memcpy(&ipaddr, stats.ip_address[0], 16);
 179                 hostname1 = get_hostname6(&ipaddr);
 180         } else {
 181                 guint32 ipaddr;
 182                 memcpy(&ipaddr, stats.ip_address[0], 4);
 183                 hostname0 = get_hostname(ipaddr);
 184                 memcpy(&ipaddr, stats.ip_address[1], 4);
 185                 hostname1 = get_hostname(ipaddr);
 186         }
 187
 188         port0 = get_udp_port(stats.port[0]);
 189         port1 = get_udp_port(stats.port[1]);
 190
 191         follow_info->is_ipv6 = stats.is_ipv6;
 192
 193         /* Both Stream Directions */
 194         both_directions_string = g_strdup_printf("Entire conversation (%u bytes)", follow_info->bytes_written[0] + follow_info->bytes_written[1]);
 195
 196         /* Host 0 --> Host 1 */
 197         server_to_client_string =
 198                 g_strdup_printf("%s:%s --> %s:%s (%u bytes)",
 199                                 hostname0, port0,
 200                                 hostname1, port1,
 201                                 follow_info->bytes_written[0]);
 202
 203         /* Host 1 --> Host 0 */
 204         client_to_server_string =
 205                 g_strdup_printf("%s:%s --> %s:%s (%u bytes)",
 206                                 hostname1, port1,
 207                                 hostname0, port0,
 208                                 follow_info->bytes_written[1]);
 209
 210         follow_stream("Follow UDP Stream", follow_info, both_directions_string,
 211                       server_to_client_string, client_to_server_string);
 212
 213         g_free(both_directions_string);
 214         g_free(server_to_client_string);
 215         g_free(client_to_server_string);
 216 }
 217
 218 #define FLT_BUF_SIZE 1024
 219
 220 /*
 221  * XXX - the routine pointed to by "print_line" doesn't get handed lines,
 222  * it gets handed bufferfuls.  That's fine for "follow_write_raw()"
 223  * and "follow_add_to_gtk_text()", but, as "follow_print_text()" calls
 224  * the "print_line()" routine from "print.c", and as that routine might
 225  * genuinely expect to be handed a line (if, for example, it's using
 226  * some OS or desktop environment's printing API, and that API expects
 227  * to be handed lines), "follow_print_text()" should probably accumulate
 228  * lines in a buffer and hand them "print_line()".  (If there's a
 229  * complete line in a buffer - i.e., there's nothing of the line in
 230  * the previous buffer or the next buffer - it can just hand that to
 231  * "print_line()" after filtering out non-printables, as an
 232  * optimization.)
 233  *
 234  * This might or might not be the reason why C arrays display
 235  * correctly but get extra blank lines very other line when printed.
 236  */
 237 frs_return_t
 238 follow_read_udp_stream(follow_info_t *follow_info,
 239                        gboolean (*print_line)(char *, size_t, gboolean, void *),
 240                        void *arg)
 241 {
 242         int iplen;
 243         guint32 global_client_pos = 0, global_server_pos = 0;
 244         guint32 *global_pos;
 245         gboolean skip;
 246         GList* cur;
 247         frs_return_t frs_return;
 248         follow_record_t *follow_record;
 249         char *buffer;
 250
 251         iplen = (follow_info->is_ipv6) ? 16 : 4;
 252
 253         for (cur = follow_info->payload; cur; cur = g_list_next(cur)) {
 254                 follow_record = cur->data;
 255                 skip = FALSE;
 256                 if (!follow_record->is_server) {
 257                         global_pos = &global_client_pos;
 258                         if(follow_info->show_stream == FROM_SERVER) {
 259                                 skip = TRUE;
 260                         }
 261                 }
 262                 else {
 263                         global_pos = &global_server_pos;
 264                         if (follow_info->show_stream == FROM_CLIENT) {
 265                                 skip = TRUE;
 266                         }
 267                 }
 268
 269                 if (!skip) {
 270                         buffer = g_memdup(follow_record->data->data,
 271                                           follow_record->data->len);
 272
 273                         frs_return = follow_show(follow_info, print_line,
 274                                                  buffer,
 275                                                  follow_record->data->len,
 276                                                  follow_record->is_server, arg,
 277                                                  global_pos);
 278                         g_free(buffer);
 279                         if(frs_return == FRS_PRINT_ERROR)
 280                                 return frs_return;
 281                 }
 282         }
 283
 284         return FRS_OK;
 285 }