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1 office 1 /* capture_stop_conditions.c
2 * Implementation for 'stop condition handler'.
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 #include <time.h>
26 #include <string.h>
27 #include <stdlib.h>
28 #include <stdarg.h>
29 #include "conditions.h"
30 #include "capture_stop_conditions.h"
31  
32 /* predefined classes function prototypes */
33 static condition* _cnd_constr_timeout(condition*, va_list);
34 static void _cnd_destr_timeout(condition*);
35 static gboolean _cnd_eval_timeout(condition*, va_list);
36 static void _cnd_reset_timeout(condition*);
37  
38 static condition* _cnd_constr_capturesize(condition*, va_list);
39 static void _cnd_destr_capturesize(condition*);
40 static gboolean _cnd_eval_capturesize(condition*, va_list);
41 static void _cnd_reset_capturesize(condition*);
42  
43 void init_capture_stop_conditions(void){
44 cnd_register_class(CND_CLASS_TIMEOUT,
45 _cnd_constr_timeout,
46 _cnd_destr_timeout,
47 _cnd_eval_timeout,
48 _cnd_reset_timeout);
49 cnd_register_class(CND_CLASS_CAPTURESIZE,
50 _cnd_constr_capturesize,
51 _cnd_destr_capturesize,
52 _cnd_eval_capturesize,
53 _cnd_reset_capturesize);
54 } /* END init_capture_stop_conditions() */
55  
56 void cleanup_capture_stop_conditions(void){
57 cnd_unregister_class(CND_CLASS_TIMEOUT);
58 cnd_unregister_class(CND_CLASS_CAPTURESIZE);
59 } /* END cleanup_capture_stop_conditions() */
60  
61 /*****************************************************************************/
62 /* Predefined condition 'timeout'. */
63  
64 /* class id */
65 const char* CND_CLASS_TIMEOUT = "cnd_class_timeout";
66  
67 /* structure that contains user supplied data for this condition */
68 typedef struct _cnd_timeout_dat{
69 time_t start_time;
70 gint32 timeout_s;
71 }cnd_timeout_dat;
72  
73 /*
74 * Constructs new condition for timeout check. This function is invoked by
75 * 'cnd_new()' in order to perform class specific initialization.
76 *
77 * parameter: cnd - Pointer to condition passed by 'cnd_new()'.
78 * ap - Pointer to user supplied arguments list for this
79 * constructor.
80 * returns: Pointer to condition - Construction was successful.
81 * NULL - Construction failed.
82 */
83 static condition* _cnd_constr_timeout(condition* cnd, va_list ap){
84 cnd_timeout_dat *data = NULL;
85 /* allocate memory */
86 if((data = (cnd_timeout_dat*)g_malloc(sizeof(cnd_timeout_dat))) == NULL)
87 return NULL;
88 /* initialize user data */
89 data->start_time = time(NULL);
90 data->timeout_s = va_arg(ap, gint32);
91 cnd_set_user_data(cnd, (void*)data);
92 return cnd;
93 } /* END _cnd_constr_timeout() */
94  
95 /*
96 * Destroys condition for timeout check. This function is invoked by
97 * 'cnd_delete()' in order to perform class specific clean up.
98 *
99 * parameter: cnd - Pointer to condition passed by 'cnd_delete()'.
100 */
101 static void _cnd_destr_timeout(condition* cnd){
102 /* free memory */
103 g_free(cnd_get_user_data(cnd));
104 } /* END _cnd_destr_timeout() */
105  
106 /*
107 * Condition handler for timeout condition. This function is invoked by
108 * 'cnd_eval()' in order to perform class specific condition checks.
109 *
110 * parameter: cnd - The inititalized timeout condition.
111 * ap - Pointer to user supplied arguments list for this
112 * handler.
113 * returns: TRUE - Condition is true.
114 * FALSE - Condition is false.
115 */
116 static gboolean _cnd_eval_timeout(condition* cnd, va_list ap _U_){
117 cnd_timeout_dat* data = (cnd_timeout_dat*)cnd_get_user_data(cnd);
118 gint32 elapsed_time;
119 /* check timeout here */
120 if(data->timeout_s == 0) return FALSE; /* 0 == infinite */
121 elapsed_time = (gint32) (time(NULL) - data->start_time);
122 if(elapsed_time >= data->timeout_s) return TRUE;
123 return FALSE;
124 } /* END _cnd_eval_timeout()*/
125  
126 /*
127 * Call this function to reset this condition to its initial state, i.e. the
128 * state it was in right after creation.
129 *
130 * parameter: cnd - Pointer to an initialized condition.
131 */
132 static void _cnd_reset_timeout(condition *cnd){
133 ((cnd_timeout_dat*)cnd_get_user_data(cnd))->start_time = time(NULL);
134 } /* END _cnd_reset_timeout() */
135  
136  
137 /*****************************************************************************/
138 /* Predefined condition 'max. capturesize'. */
139  
140 /* class id */
141 const char* CND_CLASS_CAPTURESIZE = "cnd_class_capturesize";
142  
143 /* structure that contains user supplied data for this condition */
144 typedef struct _cnd_capturesize_dat{
145 guint64 max_capture_size;
146 }cnd_capturesize_dat;
147  
148 /*
149 * Constructs new condition for capturesize check. This function is invoked by
150 * 'cnd_new()' in order to perform class specific initialization.
151 *
152 * parameter: cnd - Pointer to condition passed by 'cnd_new()'.
153 * ap - Pointer to user supplied arguments list for this
154 * constructor.
155 * returns: Pointer to condition - Construction was successful.
156 * NULL - Construction failed.
157 */
158 static condition* _cnd_constr_capturesize(condition* cnd, va_list ap){
159 cnd_capturesize_dat *data = NULL;
160 /* allocate memory */
161 if((data = (cnd_capturesize_dat*)g_malloc(sizeof(cnd_capturesize_dat))) == NULL)
162 return NULL;
163 /* initialize user data */
164 data->max_capture_size = va_arg(ap, guint64);
165 if (data->max_capture_size > ((guint64)INT_MAX + 1))
166 data->max_capture_size = (guint64)INT_MAX + 1;
167 cnd_set_user_data(cnd, (void*)data);
168 return cnd;
169 } /* END _cnd_constr_capturesize() */
170  
171 /*
172 * Destroys condition for capturesize check. This function is invoked by
173 * 'cnd_delete()' in order to perform class specific clean up.
174 *
175 * parameter: cnd - Pointer to condition passed by 'cnd_delete()'.
176 */
177 static void _cnd_destr_capturesize(condition* cnd){
178 /* free memory */
179 g_free(cnd_get_user_data(cnd));
180 } /* END _cnd_destr_capturesize() */
181  
182 /*
183 * Condition handler for capturesize condition. This function is invoked by
184 * 'cnd_eval()' in order to perform class specific condition checks.
185 *
186 * parameter: cnd - The inititalized capturesize condition.
187 * ap - Pointer to user supplied arguments list for this
188 * handler.
189 * returns: TRUE - Condition is true.
190 * FALSE - Condition is false.
191 */
192 static gboolean _cnd_eval_capturesize(condition* cnd, va_list ap){
193 cnd_capturesize_dat* data = (cnd_capturesize_dat*)cnd_get_user_data(cnd);
194 /* check capturesize here */
195 if(data->max_capture_size == 0) return FALSE; /* 0 == infinite */
196 if(va_arg(ap, guint64) >= data->max_capture_size){
197 return TRUE;
198 }
199 return FALSE;
200 } /* END _cnd_eval_capturesize() */
201  
202 /*
203 * Call this function to reset this condition to its initial state, i.e. the
204 * state it was in right after creation.
205 *
206 * parameter: cnd - Pointer to an initialized condition.
207 */
208 static void _cnd_reset_capturesize(condition *cnd _U_){
209 } /* END _cnd_reset_capturesize() */
210  
211 /*
212 * Editor modelines - http://www.wireshark.org/tools/modelines.html
213 *
214 * Local Variables:
215 * c-basic-offset: 2
216 * tab-width: 8
217 * indent-tabs-mode: nil
218 * End:
219 *
220 * ex: set shiftwidth=2 tabstop=8 expandtab:
221 * :indentSize=2:tabSize=8:noTabs=true:
222 */