Removed some unused variables and unused assignments.
[obnox/wireshark/wip.git] / 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 #ifdef HAVE_CONFIG_H
27 # include "config.h"
28 #endif
29 #include <string.h>
30
31 #include <gtk/gtk.h>
32
33 #include <epan/addr_resolv.h>
34 #include <epan/epan_dissect.h>
35 #include <epan/follow.h>
36 #include <epan/ipproto.h>
37 #include <epan/strutil.h>
38 #include <epan/tap.h>
39
40 #include <../globals.h>
41 #include <../simple_dialog.h>
42
43 #include "gtk/follow_stream.h"
44 #include <gtk/keys.h>
45 #include <gtk/main.h>
46 #include "gtk/follow_udp.h"
47
48
49 static int
50 udp_queue_packet_data(void *tapdata, packet_info *pinfo,
51                       epan_dissect_t *edt _U_, const void *data)
52 {
53         follow_record_t *follow_record;
54         follow_info_t *follow_info = tapdata;
55         const tvbuff_t *next_tvb = data;
56         
57         follow_record = g_malloc(sizeof(follow_record_t));
58
59         follow_record->data = g_byte_array_sized_new(next_tvb->length);
60         follow_record->data = g_byte_array_append(follow_record->data,
61                                                   next_tvb->real_data,
62                                                   next_tvb->length);
63
64         if (follow_info->client_port == 0) {
65                 follow_info->client_port = pinfo->srcport;
66                 COPY_ADDRESS(&follow_info->client_ip, &pinfo->src);
67         }
68
69         if (ADDRESSES_EQUAL(&follow_info->client_ip, &pinfo->src) &&
70             follow_info->client_port == pinfo->srcport)
71                 follow_record->is_server = FALSE;
72         else 
73                 follow_record->is_server = TRUE;
74
75         /* update stream counter */
76         follow_info->bytes_written[follow_record->is_server] +=
77                 follow_record->data->len;
78
79         follow_info->payload = g_list_append(follow_info->payload,
80                                              follow_record);
81         return 0;
82 }
83
84
85 /* Follow the UDP stream, if any, to which the last packet that we called
86    a dissection routine on belongs (this might be the most recently
87    selected packet, or it might be the last packet in the file). */
88 void
89 follow_udp_stream_cb(GtkWidget *w, gpointer data _U_)
90 {
91         GtkWidget *filter_te;
92         gchar *follow_filter;
93         const gchar *previous_filter;
94         int filter_out_filter_len, previous_filter_len;
95         const char *hostname0, *hostname1;
96         char *port0, *port1;
97         gchar *server_to_client_string = NULL;
98         gchar *client_to_server_string = NULL;
99         gchar *both_directions_string = NULL;
100         follow_stats_t stats;
101         follow_info_t *follow_info;
102         GString *msg;
103
104         /* we got udp so we can follow */
105         if(cfile.edt->pi.ipproto != IP_PROTO_UDP) {
106                 simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
107                               "Error following stream.  Please make\n"
108                               "sure you have a UDP packet selected.");
109                 return;
110         }
111         
112         follow_info = g_new0(follow_info_t, 1);
113         follow_info->follow_type = FOLLOW_UDP;
114
115         /* Create a new filter that matches all packets in the UDP stream,
116            and set the display filter entry accordingly */
117         follow_filter = build_follow_filter(&cfile.edt->pi);
118         if (!follow_filter)
119                 {
120                         simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
121                                       "Error creating filter for this stream.\n"
122                                       "A network layer header is needed");
123                         g_free(follow_info);
124                         return;
125                 }
126
127         /* Set the display filter entry accordingly */
128         filter_te = g_object_get_data(G_OBJECT(w), E_DFILTER_TE_KEY);
129
130         /* needed in follow_filter_out_stream(), is there a better way? */
131         follow_info->filter_te = filter_te;
132
133         /* save previous filter, const since we're not supposed to alter */
134         previous_filter =
135                 (const gchar *)gtk_entry_get_text(GTK_ENTRY(filter_te));
136
137         /* allocate our new filter. API claims g_malloc terminates program on failure */
138         /* my calc for max alloc needed is really +10 but when did a few extra bytes hurt ? */
139         previous_filter_len = previous_filter?(int)strlen(previous_filter):0;
140         filter_out_filter_len = (int)strlen(follow_filter) + previous_filter_len + 16;
141         follow_info->filter_out_filter = (gchar *)g_malloc(filter_out_filter_len);
142
143         /* append the negation */
144         if(previous_filter_len) {
145                 g_snprintf(follow_info->filter_out_filter, filter_out_filter_len,
146                            "%s and !(%s)", previous_filter, follow_filter);
147         } else {
148                 g_snprintf(follow_info->filter_out_filter, filter_out_filter_len,
149                            "!(%s)", follow_filter);
150         }
151
152         /* data will be passed via tap callback*/
153         msg = register_tap_listener("udp_follow", follow_info, follow_filter,
154                                     0, NULL, udp_queue_packet_data, NULL);
155         if (msg) {
156                 simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
157                               "Can't register udp_follow tap: %s\n",
158                               msg->str);
159                 g_free(follow_info->filter_out_filter);
160                 g_free(follow_info);
161                 g_free(follow_filter);
162                 return;
163         }
164
165         gtk_entry_set_text(GTK_ENTRY(filter_te), follow_filter);
166
167         /* Run the display filter so it goes in effect - even if it's the
168            same as the previous display filter. */
169         main_filter_packets(&cfile, follow_filter, TRUE);
170
171         /* Free the filter string, as we're done with it. */
172         g_free(follow_filter);
173
174         remove_tap_listener(follow_info);
175
176         /* Stream to show */
177         follow_stats(&stats);
178
179         if (stats.is_ipv6) {
180                 struct e_in6_addr ipaddr;
181                 memcpy(&ipaddr, stats.ip_address[0], 16);
182                 hostname0 = get_hostname6(&ipaddr);
183                 memcpy(&ipaddr, stats.ip_address[0], 16);
184                 hostname1 = get_hostname6(&ipaddr);
185         } else {
186                 guint32 ipaddr;
187                 memcpy(&ipaddr, stats.ip_address[0], 4);
188                 hostname0 = get_hostname(ipaddr);
189                 memcpy(&ipaddr, stats.ip_address[1], 4);
190                 hostname1 = get_hostname(ipaddr);
191         }
192     
193         port0 = get_udp_port(stats.port[0]);
194         port1 = get_udp_port(stats.port[1]);
195     
196         follow_info->is_ipv6 = stats.is_ipv6;
197
198         /* Both Stream Directions */
199         both_directions_string = g_strdup_printf("Entire conversation (%u bytes)", follow_info->bytes_written[0] + follow_info->bytes_written[1]);
200     
201         if(follow_info->client_port == stats.port[0]) {
202                 server_to_client_string =
203                         g_strdup_printf("%s:%s --> %s:%s (%u bytes)",
204                                         hostname0, port0,
205                                         hostname1, port1,
206                                         follow_info->bytes_written[0]);
207                 
208                 client_to_server_string =
209                         g_strdup_printf("%s:%s --> %s:%s (%u bytes)",
210                                         hostname1, port1,
211                                         hostname0, port0,
212                                         follow_info->bytes_written[1]);
213         } else {
214                 server_to_client_string =
215                         g_strdup_printf("%s:%s --> %s:%s (%u bytes)",
216                                         hostname1, port1,
217                                         hostname0, port0,
218                                         follow_info->bytes_written[0]);
219                 
220                 client_to_server_string =
221                         g_strdup_printf("%s:%s --> %s:%s (%u bytes)",
222                                         hostname0, port0,
223                                         hostname1, port1,
224                                         follow_info->bytes_written[1]);
225         }
226
227         follow_stream("Follow UDP Stream", follow_info, both_directions_string,
228                       server_to_client_string, client_to_server_string);
229
230         g_free(both_directions_string);
231         g_free(server_to_client_string);
232         g_free(client_to_server_string);
233 }
234
235 #define FLT_BUF_SIZE 1024
236
237 /*
238  * XXX - the routine pointed to by "print_line" doesn't get handed lines,
239  * it gets handed bufferfuls.  That's fine for "follow_write_raw()"
240  * and "follow_add_to_gtk_text()", but, as "follow_print_text()" calls
241  * the "print_line()" routine from "print.c", and as that routine might
242  * genuinely expect to be handed a line (if, for example, it's using
243  * some OS or desktop environment's printing API, and that API expects
244  * to be handed lines), "follow_print_text()" should probably accumulate
245  * lines in a buffer and hand them "print_line()".  (If there's a
246  * complete line in a buffer - i.e., there's nothing of the line in
247  * the previous buffer or the next buffer - it can just hand that to
248  * "print_line()" after filtering out non-printables, as an
249  * optimization.)
250  *
251  * This might or might not be the reason why C arrays display
252  * correctly but get extra blank lines very other line when printed.
253  */
254 frs_return_t
255 follow_read_udp_stream(follow_info_t *follow_info,
256                        gboolean (*print_line)(char *, size_t, gboolean, void *),
257                        void *arg)
258 {
259         guint32 global_client_pos = 0, global_server_pos = 0;
260         guint32 server_packet_count = 0;
261         guint32 client_packet_count = 0;
262         guint32 *global_pos;
263         gboolean skip;
264         GList* cur;
265         frs_return_t frs_return;
266         follow_record_t *follow_record;
267         char *buffer;
268
269
270         for (cur = follow_info->payload; cur; cur = g_list_next(cur)) {
271                 follow_record = cur->data;
272                 skip = FALSE;
273                 if (!follow_record->is_server) {
274                         global_pos = &global_client_pos;
275                         if(follow_info->show_stream == FROM_SERVER) {
276                                 skip = TRUE;
277                         }
278                 } else {
279                         global_pos = &global_server_pos;
280                         if (follow_info->show_stream == FROM_CLIENT) {
281                                 skip = TRUE;
282                         }
283                 }
284
285                 if (!skip) {
286                         buffer = g_memdup(follow_record->data->data,
287                                           follow_record->data->len);
288             
289                         frs_return = follow_show(follow_info, print_line,
290                                                  buffer,
291                                                  follow_record->data->len,
292                                                  follow_record->is_server, arg,
293                                                  global_pos, 
294                                                  &server_packet_count,
295                                                  &client_packet_count);
296                         g_free(buffer);
297                         if(frs_return == FRS_PRINT_ERROR)
298                                 return frs_return;
299                 }
300         }
301
302         return FRS_OK;
303 }