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1 office 1 /* capture_info.c
2 * capture info functions
3 *
4 * Wireshark - Network traffic analyzer
5 * By Gerald Combs <gerald@wireshark.org>
6 * Copyright 1998 Gerald Combs
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version 2
11 * of the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22  
23 #include <config.h>
24  
25 #ifdef HAVE_LIBPCAP
26  
27 #include <glib.h>
28  
29 #include <epan/packet.h>
30 #include <wiretap/wtap.h>
31  
32 #include "capture_info.h"
33  
34 #include <epan/capture_dissectors.h>
35  
36 #include <wsutil/filesystem.h>
37  
38 /* open the info */
39 void capture_info_open(capture_session *cap_session, info_data_t* cap_info)
40 {
41 if (cap_info->counts.counts_hash != NULL)
42 {
43 /* Clean up any previous lists of packet counts */
44 g_hash_table_destroy(cap_info->counts.counts_hash);
45 }
46 cap_info->counts.counts_hash = g_hash_table_new_full( g_direct_hash, g_direct_equal, NULL, g_free );
47 cap_info->counts.other = 0;
48 cap_info->counts.total = 0;
49  
50 cap_info->wtap = NULL;
51 cap_info->ui.counts = &cap_info->counts;
52  
53 capture_info_ui_create(&cap_info->ui, cap_session);
54 }
55  
56  
57 static const char *
58 cf_open_error_message(int err, gchar *err_info, gboolean for_writing,
59 int file_type)
60 {
61 const char *errmsg;
62 static char errmsg_errno[1024+1];
63  
64 if (err < 0) {
65 /* Wiretap error. */
66 switch (err) {
67  
68 case WTAP_ERR_NOT_REGULAR_FILE:
69 errmsg = "The file \"%s\" is a \"special file\" or socket or other non-regular file.";
70 break;
71  
72 case WTAP_ERR_FILE_UNKNOWN_FORMAT:
73 /* Seen only when opening a capture file for reading. */
74 errmsg = "The file \"%s\" isn't a capture file in a format Wireshark understands.";
75 break;
76  
77 case WTAP_ERR_UNSUPPORTED:
78 /* Seen only when opening a capture file for reading. */
79 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
80 "The file \"%%s\" contains record data that Wireshark doesn't support.\n"
81 "(%s)", err_info != NULL ? err_info : "no information supplied");
82 g_free(err_info);
83 errmsg = errmsg_errno;
84 break;
85  
86 case WTAP_ERR_CANT_WRITE_TO_PIPE:
87 /* Seen only when opening a capture file for writing. */
88 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
89 "The file \"%%s\" is a pipe, and %s capture files can't be "
90 "written to a pipe.", wtap_file_type_subtype_string(file_type));
91 errmsg = errmsg_errno;
92 break;
93  
94 case WTAP_ERR_UNWRITABLE_FILE_TYPE:
95 /* Seen only when opening a capture file for writing. */
96 errmsg = "Wireshark doesn't support writing capture files in that format.";
97 break;
98  
99 case WTAP_ERR_UNWRITABLE_ENCAP:
100 /* Seen only when opening a capture file for writing. */
101 errmsg = "Wireshark can't save this capture in that format.";
102 break;
103  
104 case WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED:
105 if (for_writing)
106 errmsg = "Wireshark can't save this capture in that format.";
107 else
108 errmsg = "The file \"%s\" is a capture for a network type that Wireshark doesn't support.";
109 break;
110  
111 case WTAP_ERR_BAD_FILE:
112 /* Seen only when opening a capture file for reading. */
113 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
114 "The file \"%%s\" appears to be damaged or corrupt.\n"
115 "(%s)", err_info != NULL ? err_info : "no information supplied");
116 g_free(err_info);
117 errmsg = errmsg_errno;
118 break;
119  
120 case WTAP_ERR_CANT_OPEN:
121 if (for_writing)
122 errmsg = "The file \"%s\" could not be created for some unknown reason.";
123 else
124 errmsg = "The file \"%s\" could not be opened for some unknown reason.";
125 break;
126  
127 case WTAP_ERR_SHORT_READ:
128 errmsg = "The file \"%s\" appears to have been cut short"
129 " in the middle of a packet or other data.";
130 break;
131  
132 case WTAP_ERR_SHORT_WRITE:
133 errmsg = "A full header couldn't be written to the file \"%s\".";
134 break;
135  
136 case WTAP_ERR_DECOMPRESS:
137 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
138 "The compressed file \"%%s\" appears to be damaged or corrupt.\n"
139 "(%s)", err_info != NULL ? err_info : "no information supplied");
140 g_free(err_info);
141 errmsg = errmsg_errno;
142 break;
143  
144 default:
145 g_snprintf(errmsg_errno, sizeof(errmsg_errno),
146 "The file \"%%s\" could not be %s: %s.",
147 for_writing ? "created" : "opened",
148 wtap_strerror(err));
149 errmsg = errmsg_errno;
150 break;
151 }
152 } else
153 errmsg = file_open_error_message(err, for_writing);
154 return errmsg;
155 }
156  
157 /* new file arrived */
158 gboolean capture_info_new_file(const char *new_filename, info_data_t* cap_info)
159 {
160 int err;
161 gchar *err_info;
162 gchar *err_msg;
163  
164  
165 if(cap_info->wtap != NULL) {
166 wtap_close(cap_info->wtap);
167 }
168  
169 cap_info->wtap = wtap_open_offline(new_filename, WTAP_TYPE_AUTO, &err, &err_info, FALSE);
170 if (!cap_info->wtap) {
171 err_msg = g_strdup_printf(cf_open_error_message(err, err_info, FALSE, WTAP_FILE_TYPE_SUBTYPE_UNKNOWN),
172 new_filename);
173 g_warning("capture_info_new_file: %d (%s)", err, err_msg);
174 g_free (err_msg);
175 return FALSE;
176 } else
177 return TRUE;
178 }
179  
180 static void
181 capture_info_packet(info_data_t* cap_info, gint wtap_linktype, const guchar *pd, guint32 caplen, union wtap_pseudo_header *pseudo_header)
182 {
183 capture_packet_info_t cpinfo;
184  
185 /* Setup the capture packet structure */
186 cpinfo.counts = cap_info->counts.counts_hash;
187  
188 cap_info->counts.total++;
189 if (!try_capture_dissector("wtap_encap", wtap_linktype, pd, 0, caplen, &cpinfo, pseudo_header))
190 cap_info->counts.other++;
191 }
192  
193 /* new packets arrived */
194 void capture_info_new_packets(int to_read, info_data_t* cap_info)
195 {
196 int err;
197 gchar *err_info;
198 gint64 data_offset;
199 struct wtap_pkthdr *phdr;
200 union wtap_pseudo_header *pseudo_header;
201 int wtap_linktype;
202 const guchar *buf;
203  
204  
205 cap_info->ui.new_packets = to_read;
206  
207 /*g_warning("new packets: %u", to_read);*/
208  
209 while (to_read > 0) {
210 wtap_cleareof(cap_info->wtap);
211 if (wtap_read(cap_info->wtap, &err, &err_info, &data_offset)) {
212 phdr = wtap_phdr(cap_info->wtap);
213 pseudo_header = &phdr->pseudo_header;
214 wtap_linktype = phdr->pkt_encap;
215 buf = wtap_buf_ptr(cap_info->wtap);
216  
217 capture_info_packet(cap_info, wtap_linktype, buf, phdr->caplen, pseudo_header);
218  
219 /*g_warning("new packet");*/
220 to_read--;
221 }
222 }
223  
224 capture_info_ui_update(&cap_info->ui);
225 }
226  
227  
228 /* close the info */
229 void capture_info_close(info_data_t* cap_info)
230 {
231 capture_info_ui_destroy(&cap_info->ui);
232 if(cap_info->wtap)
233 wtap_close(cap_info->wtap);
234 }
235  
236 #endif /* HAVE_LIBPCAP */
237  
238 /*
239 * Editor modelines - http://www.wireshark.org/tools/modelines.html
240 *
241 * Local variables:
242 * c-basic-offset: 4
243 * tab-width: 8
244 * indent-tabs-mode: nil
245 * End:
246 *
247 * vi: set shiftwidth=4 tabstop=8 expandtab:
248 * :indentSize=4:tabSize=8:noTabs=true:
249 */