summaryrefslogtreecommitdiffstats
path: root/contrib/ntp/sntp/kod_management.c
blob: c8df3bdca60e1e9deca23225f2297c74e44c9a5d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
#include <config.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>

#include "kod_management.h"
#include "log.h"
#include "sntp-opts.h"
#include "ntp_stdlib.h"
#include "ntp_worker.h"
#include "ntp_debug.h"

int kod_init = 0, kod_db_cnt = 0;
const char *kod_db_file;
struct kod_entry **kod_db;	/* array of pointers to kod_entry */


/*
 * Search for a KOD entry
 */
int
search_entry(
	const char *hostname,
	struct kod_entry **dst
	)
{
	register int a, b, resc = 0;

	for (a = 0; a < kod_db_cnt; a++)
		if (!strcmp(kod_db[a]->hostname, hostname))
			resc++;

	if (!resc) {
		*dst = NULL;
		return 0;
	}

	*dst = eallocarray(resc, sizeof(**dst));

	b = 0;
	for (a = 0; a < kod_db_cnt; a++)
		if (!strcmp(kod_db[a]->hostname, hostname)) {
			(*dst)[b] = *kod_db[a];
			b++;
		}

	return resc;
}


void
add_entry(
	const char *	hostname,
	const char *	type	/* 4 bytes not \0 terminated */
	)
{
	int n;
	struct kod_entry *pke;

	pke = emalloc_zero(sizeof(*pke));
	pke->timestamp = time(NULL);
	memcpy(pke->type, type, 4);
	pke->type[sizeof(pke->type) - 1] = '\0';
	strlcpy(pke->hostname, hostname, sizeof(pke->hostname));

	/*
	 * insert in address ("hostname") order to find duplicates
	 */
	for (n = 0; n < kod_db_cnt; n++)
		if (strcmp(kod_db[n]->hostname, pke->hostname) >= 0)
			break;

	if (n < kod_db_cnt &&
	    0 == strcmp(kod_db[n]->hostname, pke->hostname)) {
		kod_db[n]->timestamp = pke->timestamp;
		free(pke);
		return;
	}

	kod_db_cnt++;
	kod_db = erealloc(kod_db, kod_db_cnt * sizeof(kod_db[0]));
	if (n != kod_db_cnt - 1)
		memmove(&kod_db[n + 1], &kod_db[n],
			sizeof(kod_db[0]) * ((kod_db_cnt - 1) - n));
	kod_db[n] = pke;
}


void
delete_entry(
	const char *	hostname,
	const char *	type
	)
{
	int a;

	for (a = 0; a < kod_db_cnt; a++)
		if (!strcmp(kod_db[a]->hostname, hostname)
		    && !strcmp(kod_db[a]->type, type))
			break;

	if (a == kod_db_cnt)
		return;

	free(kod_db[a]);
	kod_db_cnt--;

	if (a < kod_db_cnt)
		memmove(&kod_db[a], &kod_db[a + 1],
			(kod_db_cnt - a) * sizeof(kod_db[0]));
}


void
atexit_write_kod_db(void)
{
#ifdef WORK_FORK
	if (worker_process)
		return;
#endif
	write_kod_db();
}


int
write_kod_db(void)
{
	FILE *db_s;
	char *pch;
	int dirmode;
	register int a;

	db_s = fopen(kod_db_file, "w");

	/*
	 * If opening fails, blindly attempt to create each directory
	 * in the path first, then retry the open.
	 */
	if (NULL == db_s && strlen(kod_db_file)) {
		dirmode = S_IRUSR | S_IWUSR | S_IXUSR
			| S_IRGRP | S_IXGRP
			| S_IROTH | S_IXOTH;
		pch = strchr(kod_db_file + 1, DIR_SEP);
		while (NULL != pch) {
			*pch = '\0';
			if (-1 == mkdir(kod_db_file, dirmode)
			    && errno != EEXIST) {
				msyslog(LOG_ERR, "mkdir(%s) failed: %m",
					kod_db_file);
				return FALSE;
			}
			*pch = DIR_SEP;
			pch = strchr(pch + 1, DIR_SEP);
		}
		db_s = fopen(kod_db_file, "w");
	}

	if (NULL == db_s) {
		msyslog(LOG_WARNING, "Can't open KOD db file %s for writing: %m",
			kod_db_file);

		return FALSE;
	}

	for (a = 0; a < kod_db_cnt; a++) {
		fprintf(db_s, "%16.16llx %s %s\n", (unsigned long long)
			kod_db[a]->timestamp, kod_db[a]->type,
			kod_db[a]->hostname);
	}

	fflush(db_s);
	fclose(db_s);

	return TRUE;
}


void
kod_init_kod_db(
	const char *	db_file,
	int		readonly
	)
{
	/*
	 * Max. of 254 characters for hostname, 10 for timestamp, 4 for
	 * kisscode, 2 for spaces, 1 for \n, and 1 for \0
	 */
	char fbuf[254+10+4+2+1+1];
	FILE *db_s;
	int a, b, sepc, len;
	unsigned long long ull;
	char *str_ptr;
	char error = 0;

	TRACE(2, ("Initializing KOD DB...\n"));

	kod_db_file = estrdup(db_file);

	db_s = fopen(db_file, "r");

	if (NULL == db_s) {
		msyslog(LOG_WARNING, "kod_init_kod_db(): Cannot open KoD db file %s: %m",
			db_file);

		return;
	}

	if (debug)
		printf("Starting to read KoD file %s...\n", db_file);
	/* First let's see how many entries there are and check for right syntax */

	while (!feof(db_s) && NULL != fgets(fbuf, sizeof(fbuf), db_s)) {

		/* ignore blank lines */
		if ('\n' == fbuf[0])
			continue;

		sepc = 0;
		len = strlen(fbuf);
		for (a = 0; a < len; a++) {
			if (' ' == fbuf[a])
				sepc++;

			if ('\n' == fbuf[a]) {
				if (sepc != 2) {
					if (strcmp(db_file, "/dev/null"))
						msyslog(LOG_DEBUG,
							"Syntax error in KoD db file %s in line %i (missing space)",
							db_file,
							kod_db_cnt + 1);
					fclose(db_s);
					return;
				}
				sepc = 0;
				kod_db_cnt++;
			}
		}
	}

	if (0 == kod_db_cnt) {
		TRACE(2, ("KoD DB %s empty.\n", db_file));
		goto wrapup;
	}

	TRACE(2, ("KoD DB %s contains %d entries, reading...\n", db_file, kod_db_cnt));

	rewind(db_s);

	kod_db = eallocarray(kod_db_cnt, sizeof(kod_db[0]));

	/* Read contents of file */
	for (b = 0; 
	     !feof(db_s) && !ferror(db_s) && b < kod_db_cnt;
	     b++) {

		str_ptr = fgets(fbuf, sizeof(fbuf), db_s);
		if (NULL == str_ptr) {
			error = 1;
			break;
		}

		/* ignore blank lines */
		if ('\n' == fbuf[0]) {
			b--;
			continue;
		}

		kod_db[b] = emalloc(sizeof(*kod_db[b]));

		if (3 != sscanf(fbuf, "%llx %4s %254s", &ull,
		    kod_db[b]->type, kod_db[b]->hostname)) {

			free(kod_db[b]);
			kod_db[b] = NULL;
			error = 1;
			break;
		}

		kod_db[b]->timestamp = (time_t)ull;
	}

	if (ferror(db_s) || error) {
		kod_db_cnt = b;
		msyslog(LOG_WARNING, "An error occured while parsing the KoD db file %s",
			db_file);
		fclose(db_s);

		return;
	}

    wrapup:
	fclose(db_s);
	for (a = 0; a < kod_db_cnt; a++)
		TRACE(2, ("KoD entry %d: %s at %llx type %s\n", a,
			  kod_db[a]->hostname,
			  (unsigned long long)kod_db[a]->timestamp,
			  kod_db[a]->type));

	if (!readonly && write_kod_db())
		atexit(&atexit_write_kod_db);
}
OpenPOWER on IntegriCloud