### Bug Summary

File: | builds/wireshark/wireshark/ui/summary.c
Warning: | line 232, column 29 File position of the stream might be 'indeterminate' after a failed operation. Can cause undefined behavior

### Annotated Source Code

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1 | /* summary.c
2 | * Routines for capture file summary info
3 | *
4 | * Wireshark - Network traffic analyzer
5 | * By Gerald Combs <gerald@wireshark.org>
6 | * Copyright 1998 Gerald Combs
7 | *
8 | * SPDX-License-Identifier: GPL-2.0-or-later
9 | */
10 |
11 | #include <config.h>
12 |
13 | #include <wiretap/pcap-encap.h>
14 | #include <wiretap/wtap_opttypes.h>
15 |
16 | #include <epan/packet.h>
17 | #include <wsutil/file_util.h>
18 | #include <gcrypt.h>
19 | #include "cfile.h"
20 | #include "ui/summary.h"
21 |
22 | // Strongest to weakest
23 | #define HASH_SIZE_SHA25632 32
24 | #define HASH_SIZE_SHA120 20
25 |
26 | #define HASH_BUF_SIZE(1024 * 1024) (1024 * 1024)
27 |
28 | static void
29 | tally_frame_data(frame_data *cur_frame, summary_tally *sum_tally)
30 | {
31 | double cur_time;
32 |
33 | sum_tally->bytes += cur_frame->pkt_len;
34 | if (cur_frame->passed_dfilter){
35 | sum_tally->filtered_count++;
36 | sum_tally->filtered_bytes += cur_frame->pkt_len;
37 | }
38 | if (cur_frame->marked){
39 | sum_tally->marked_count++;
40 | sum_tally->marked_bytes += cur_frame->pkt_len;
41 | }
42 | if (cur_frame->ignored){
43 | sum_tally->ignored_count++;
44 | }
45 |
46 | if (cur_frame->has_ts) {
47 | /* This packet has a time stamp. */
48 | cur_time = nstime_to_sec(&cur_frame->abs_ts);
49 |
50 | sum_tally->packet_count_ts++;
51 | if (cur_time < sum_tally->start_time) {
52 | sum_tally->start_time = cur_time;
53 | }
54 | if (cur_time > sum_tally->stop_time){
55 | sum_tally->stop_time = cur_time;
56 | }
57 | if (cur_frame->passed_dfilter){
58 | sum_tally->filtered_count_ts++;
59 | /*
60 | * If we've seen one filtered packet, this is the first
61 | * one.
62 | */
63 | if (sum_tally->filtered_count == 1){
64 | sum_tally->filtered_start= cur_time;
65 | sum_tally->filtered_stop = cur_time;
66 | } else {
67 | if (cur_time < sum_tally->filtered_start) {
68 | sum_tally->filtered_start = cur_time;
69 | }
70 | if (cur_time > sum_tally->filtered_stop) {
71 | sum_tally->filtered_stop = cur_time;
72 | }
73 | }
74 | }
75 | if (cur_frame->marked){
76 | sum_tally->marked_count_ts++;
77 | /*
78 | * If we've seen one marked packet, this is the first
79 | * one.
80 | */
81 | if (sum_tally->marked_count == 1){
82 | sum_tally->marked_start= cur_time;
83 | sum_tally->marked_stop = cur_time;
84 | } else {
85 | if (cur_time < sum_tally->marked_start) {
86 | sum_tally->marked_start = cur_time;
87 | }
88 | if (cur_time > sum_tally->marked_stop) {
89 | sum_tally->marked_stop = cur_time;
90 | }
91 | }
92 | }
93 | }
94 | }
95 |
96 | static void
97 | hash_to_str(const unsigned char *hash, size_t length, char *str) {
98 | int i;
99 |
100 | for (i = 0; i < (int) length; i++) {
101 | snprintf(str+(i*2), 3, "%02x", hash[i]);
102 | }
103 | }
104 |
105 | void
106 | summary_fill_in(capture_file *cf, summary_tally *st)
107 | {
108 | frame_data *first_frame, *cur_frame;
109 | uint32_t framenum;
110 | iface_summary_info iface;
111 | unsigned i;
112 | wtapng_iface_descriptions_t* idb_info;
113 | wtap_block_t wtapng_if_descr;
114 | wtapng_if_descr_mandatory_t *wtapng_if_descr_mand;
115 | wtap_block_t if_stats;
116 | uint64_t isb_ifdrop;
117 | char* if_string;
118 | if_filter_opt_t if_filter;
119 |
120 | FILE *fh;
121 | char *hash_buf;
122 | gcry_md_hd_t hd;
123 | size_t hash_bytes;
124 |
125 | st->packet_count_ts = 0;
126 | st->start_time = DBL_MAX1.7976931348623157e+308;
127 | st->stop_time = DBL_MIN2.2250738585072014e-308;
128 | st->bytes = 0;
129 | st->filtered_count = 0;
130 | st->filtered_count_ts = 0;
131 | st->filtered_start = DBL_MAX1.7976931348623157e+308;
132 | st->filtered_stop = 0;
133 | st->filtered_bytes = 0;
134 | st->marked_count = 0;
135 | st->marked_count_ts = 0;
136 | st->marked_start = DBL_MAX1.7976931348623157e+308;
137 | st->marked_stop = 0;
138 | st->marked_bytes = 0;
139 | st->ignored_count = 0;
140 |
141 | const nstime_t *cap_start = cap_file_provider_get_start_ts(&(cf->provider));
142 | const nstime_t *cap_end = cap_file_provider_get_end_ts(&(cf->provider));
143 | st->cap_start_time = (cap_start == NULL((void*)0) || nstime_is_unset(cap_start)) ? DBL_MAX1.7976931348623157e+308 : nstime_to_sec(cap_start);
1 | Assuming 'cap_start' is equal to NULL | →
144 | st->cap_end_time = (cap_end == NULL((void*)0) || nstime_is_unset(cap_end)) ? DBL_MIN2.2250738585072014e-308 : nstime_to_sec(cap_end);
2 | ← | Assuming 'cap_end' is equal to NULL | →
145 |
146 | /* initialize the tally */
147 | if (cf->count != 0) {
3 | ← | Assuming field 'count' is equal to 0 | →
4 | ← | Taking false branch | →
148 | first_frame = frame_data_sequence_find(cf->provider.frames, 1);
149 | if (first_frame->has_ts) {
150 | st->start_time = nstime_to_sec(&first_frame->abs_ts);
151 | st->stop_time = nstime_to_sec(&first_frame->abs_ts);
152 | }
153 |
154 | for (framenum = 1; framenum <= cf->count; framenum++) {
155 | cur_frame = frame_data_sequence_find(cf->provider.frames, framenum);
156 | tally_frame_data(cur_frame, st);
157 | }
158 | }
159 |
160 | st->filename = cf->filename;
161 | st->file_length = cf->f_datalen;
162 | st->file_type = cf->cd_t;
163 | st->compression_type = cf->compression_type;
164 | st->is_tempfile = cf->is_tempfile;
165 | st->file_encap_type = cf->lnk_t;
166 | st->packet_encap_types = cf->linktypes;
167 | st->snap = cf->snap;
168 | st->elapsed_time = nstime_to_sec(&cf->elapsed_time);
169 | st->packet_count = cf->count;
170 | st->drops_known = cf->drops_known;
171 | st->drops = cf->drops;
172 | st->dfilter = cf->dfilter;
173 |
174 | st->ifaces = g_array_new(false0, false0, sizeof(iface_summary_info));
175 | idb_info = wtap_file_get_idb_info(cf->provider.wth);
176 | for (i = 0; i < idb_info->interface_data->len; i++) {
5 | ← | Assuming 'i' is >= field 'len' | →
6 | ← | Loop condition is false. Execution continues on line 219 | →
177 | wtapng_if_descr = g_array_index(idb_info->interface_data, wtap_block_t, i)(((wtap_block_t*) (void *) (idb_info->interface_data)-> data) [(i)]);
178 | wtapng_if_descr_mand = (wtapng_if_descr_mandatory_t*)wtap_block_get_mandatory_data(wtapng_if_descr);
179 | if (wtap_block_get_if_filter_option_value(wtapng_if_descr, OPT_IDB_FILTER11, &if_filter) == WTAP_OPTTYPE_SUCCESS) {
180 | if (if_filter.type == if_filter_pcap) {
181 | iface.cfilter = g_strdup(if_filter.data.filter_str)g_strdup_inline (if_filter.data.filter_str);
182 | } else {
183 | /* Not a pcap filter string; punt for now */
184 | iface.cfilter = NULL((void*)0);
185 | }
186 | } else {
187 | iface.cfilter = NULL((void*)0);
188 | }
189 | if (wtap_block_get_string_option_value(wtapng_if_descr, OPT_IDB_NAME2, &if_string) == WTAP_OPTTYPE_SUCCESS) {
190 | iface.name = g_strdup(if_string)g_strdup_inline (if_string);
191 | } else {
192 | iface.name = NULL((void*)0);
193 | }
194 | if (wtap_block_get_string_option_value(wtapng_if_descr, OPT_IDB_DESCRIPTION3, &if_string) == WTAP_OPTTYPE_SUCCESS) {
195 | iface.descr = g_strdup(if_string)g_strdup_inline (if_string);
196 | } else {
197 | iface.descr = NULL((void*)0);
198 | }
199 | iface.drops_known = false0;
200 | iface.drops = 0;
201 | iface.snap = wtapng_if_descr_mand->snap_len;
202 | iface.encap_type = wtapng_if_descr_mand->wtap_encap;
203 | iface.isb_comment = NULL((void*)0);
204 | if(wtapng_if_descr_mand->num_stat_entries == 1){
205 | /* dumpcap only writes one ISB, only handle that for now */
206 | if_stats = g_array_index(wtapng_if_descr_mand->interface_statistics, wtap_block_t, 0)(((wtap_block_t*) (void *) (wtapng_if_descr_mand->interface_statistics )->data) [(0)]);
207 | if (wtap_block_get_uint64_option_value(if_stats, OPT_ISB_IFDROP5, &isb_ifdrop) == WTAP_OPTTYPE_SUCCESS) {
208 | iface.drops_known = true1;
209 | iface.drops = isb_ifdrop;
210 | }
211 | /* XXX: this doesn't get used, and might need to be g_strdup'ed when it does */
212 | /* XXX - support multiple comments */
213 | if (wtap_block_get_nth_string_option_value(if_stats, OPT_COMMENT1, 0, &iface.isb_comment) != WTAP_OPTTYPE_SUCCESS) {
214 | iface.isb_comment = NULL((void*)0);
215 | }
216 | }
217 | g_array_append_val(st->ifaces, iface)g_array_append_vals (st->ifaces, &(iface), 1);
218 | }
219 | g_free(idb_info);
220 |
221 | (void) g_strlcpy(st->file_sha256, "<unknown>", HASH_STR_SIZE(65));
222 | (void) g_strlcpy(st->file_sha1, "<unknown>", HASH_STR_SIZE(65));
223 |
224 | gcry_md_open(&hd, GCRY_MD_SHA256, 0);
225 | if (hd) {
7 | ← | Assuming 'hd' is non-null | →
8 | ← | Taking true branch | →
226 | gcry_md_enable(hd, GCRY_MD_SHA1);
227 | }
228 | hash_buf = (char *)g_malloc(HASH_BUF_SIZE(1024 * 1024));
229 |
230 | fh = ws_fopenfopen(cf->filename, "rb");
231 | if (fh
8.1 | 'fh' is non-null
&& hash_buf && hd
9.1 | 'hd' is non-null
) {
9 | ← | Assuming 'hash_buf' is non-null | →
10 | ← | Taking true branch | →
232 | while((hash_bytes = fread(hash_buf, 1, HASH_BUF_SIZE(1024 * 1024), fh)) > 0) {
11 | ← | Assuming this stream operation fails | →
12 | ← | Assuming the condition is true | →
13 | ← | Loop condition is true. Entering loop body | →
14 | ← | File position of the stream might be 'indeterminate' after a failed operation. Can cause undefined behavior
233 | gcry_md_write(hd, hash_buf, hash_bytes);
234 | }
235 | gcry_md_final(hd)gcry_md_ctl ((hd), GCRYCTL_FINALIZE, ((void*)0), 0);
236 | hash_to_str(gcry_md_read(hd, GCRY_MD_SHA256), HASH_SIZE_SHA25632, st->file_sha256);
237 | hash_to_str(gcry_md_read(hd, GCRY_MD_SHA1), HASH_SIZE_SHA120, st->file_sha1);
238 | }
239 | if (fh) fclose(fh);
240 | g_free(hash_buf);
241 | gcry_md_close(hd);
242 | }
243 |
244 | #ifdef HAVE_LIBPCAP1
245 | void
246 | summary_fill_in_capture(capture_file *cf,capture_options *capture_opts, summary_tally *st)
247 | {
248 | iface_summary_info iface;
249 | interface_t *device;
250 | unsigned i;
251 |
252 | if (st->ifaces->len == 0) {
253 | /*
254 | * XXX - do this only if we have a live capture.
255 | */
256 | for (i = 0; i < capture_opts->all_ifaces->len; i++) {
257 | device = &g_array_index(capture_opts->all_ifaces, interface_t, i)(((interface_t*) (void *) (capture_opts->all_ifaces)->data ) [(i)]);
258 | if (!device->selected) {
259 | continue;
260 | }
261 | iface.cfilter = g_strdup(device->cfilter)g_strdup_inline (device->cfilter);
262 | iface.name = g_strdup(device->name)g_strdup_inline (device->name);
263 | iface.descr = g_strdup(device->display_name)g_strdup_inline (device->display_name);
264 | iface.drops_known = cf->drops_known;
265 | iface.drops = cf->drops;
266 | iface.snap = device->snaplen;
267 | iface.encap_type = wtap_pcap_encap_to_wtap_encap(device->active_dlt);
268 | g_array_append_val(st->ifaces, iface)g_array_append_vals (st->ifaces, &(iface), 1);
269 | }
270 | }
271 | }
272 | #endif