summaryrefslogtreecommitdiffstats
path: root/outchannel.c
blob: 9b669cb1240e6a45095edb29c148135de2a61dc0 (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
/* This is the output channel processing code of rsyslog.
 * Output channels - in the long term - will define how
 * messages will be sent to whatever file or other medium.
 * Currently, they mainly provide a way to store some file-related
 * information (most importantly the maximum file size allowed).
 * Please see syslogd.c for license information.
 * This code is placed under the GPL.
 * begun 2005-06-21 rgerhards
 *
 * Copyright (C) 2005 by Rainer Gerhards and Adiscon GmbH
 *
 * This file is part of rsyslog.
 *
 * Rsyslog is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Rsyslog is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Rsyslog.  If not, see <http://www.gnu.org/licenses/>.
 *
 * A copy of the GPL can be found in the file "COPYING" in this distribution.
 */
#include "config.h"

#include "rsyslog.h"
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include "stringbuf.h"
#include "outchannel.h"
#include "syslogd.h"

static struct outchannel *ochRoot = NULL;	/* the root of the outchannel list */
static struct outchannel *ochLast = NULL;	/* points to the last element of the outchannel list */

/* Constructs a outchannel list object. Returns pointer to it
 * or NULL (if it fails).
 */
struct outchannel* ochConstruct(void)
{
	struct outchannel *pOch;
	if((pOch = calloc(1, sizeof(struct outchannel))) == NULL)
		return NULL;
	
	/* basic initialisaion is done via calloc() - need to
	 * initialize only values != 0. */

	if(ochLast == NULL)
	{ /* we are the first element! */
		ochRoot = ochLast = pOch;
	}
	else
	{
		ochLast->pNext = pOch;
		ochLast = pOch;
	}

	return(pOch);
}


/* skips the next comma and any whitespace
 * in front and after it.
 */
static void skip_Comma(char **pp)
{
	register char *p;

	assert(pp != NULL);
	assert(*pp != NULL);

	p = *pp;
	while(isspace((int)*p))
		++p;
	if(*p == ',')
		++p;
	while(isspace((int)*p))
		++p;
	*pp = p;
}

/* helper to ochAddLine. Parses a comma-delimited field
 * The field is delimited by SP or comma. Leading whitespace
 * is "eaten" and does not become part of the field content.
 * returns: 0 - ok, 1 - failure
 */
static int get_Field(uchar **pp, uchar **pField)
{
	register uchar *p;
	cstr_t *pStrB;

	assert(pp != NULL);
	assert(*pp != NULL);
	assert(pField != NULL);

	skip_Comma((char**)pp);
	p = *pp;

	if(rsCStrConstruct(&pStrB) != RS_RET_OK)
		 return 1;
	rsCStrSetAllocIncrement(pStrB, 32);

	/* copy the field */
	while(*p && *p != ' ' && *p != ',') {
		rsCStrAppendChar(pStrB, *p++);
	}

	*pp = p;
	rsCStrFinish(pStrB);
	if(rsCStrConvSzStrAndDestruct(pStrB, pField, 0) != RS_RET_OK)
		return 1;

	return 0;
}


/* helper to ochAddLine. Parses a off_t type from the
 * input line.
 * returns: 0 - ok, 1 - failure
 */
static int get_off_t(uchar **pp, off_t *pOff_t)
{
	register uchar *p;
	off_t val;

	assert(pp != NULL);
	assert(*pp != NULL);
	assert(pOff_t != NULL);

	skip_Comma((char**)pp);
	p = *pp;

	val = 0;
	while(*p && isdigit((int)*p)) {
		val = val * 10 + (*p - '0');
		++p;
	}

	*pp = p;
	*pOff_t = val;

	return 0;
}


/* helper to ochAddLine. Parses everything from the
 * current position to the end of line and returns it
 * to the caller. Leading white space is removed, but
 * not trailing.
 * returns: 0 - ok, 1 - failure
 */
static inline int get_restOfLine(uchar **pp, uchar **pBuf)
{
	register uchar *p;
	cstr_t *pStrB;

	assert(pp != NULL);
	assert(*pp != NULL);
	assert(pBuf != NULL);

	skip_Comma((char**)pp);
	p = *pp;

	if(rsCStrConstruct(&pStrB) != RS_RET_OK)
		 return 1;
	rsCStrSetAllocIncrement(pStrB, 32);

	/* copy the field */
	while(*p) {
		rsCStrAppendChar(pStrB, *p++);
	}

	*pp = p;
	rsCStrFinish(pStrB);
	if(rsCStrConvSzStrAndDestruct(pStrB, pBuf, 0) != RS_RET_OK)
		return 1;

	return 0;
}


/* Add a new outchannel line
 * returns pointer to new object if it succeeds, NULL otherwise.
 * An outchannel line is primarily a set of fields delemited by commas.
 * There might be some whitespace between the field (but not within)
 * and the commas. This can be removed.
 */
struct outchannel *ochAddLine(char* pName, uchar** ppRestOfConfLine)
{
	struct outchannel *pOch;
 	uchar *p;

	assert(pName != NULL);
	assert(ppRestOfConfLine != NULL);

	if((pOch = ochConstruct()) == NULL)
		return NULL;
	
	pOch->iLenName = strlen(pName);
	pOch->pszName = (char*) malloc(sizeof(char) * (pOch->iLenName + 1));
	if(pOch->pszName == NULL) {
		dbgprintf("ochAddLine could not alloc memory for outchannel name!");
		pOch->iLenName = 0;
		return NULL;
		/* I know - we create a memory leak here - but I deem
		 * it acceptable as it is a) a very small leak b) very
		 * unlikely to happen. rgerhards 2004-11-17
		 */
	}
	memcpy(pOch->pszName, pName, pOch->iLenName + 1);

	/* now actually parse the line */
	p = *ppRestOfConfLine;
	assert(p != NULL);

	/* get params */
	get_Field(&p, &pOch->pszFileTemplate);
	if(*p) get_off_t(&p, &pOch->uSizeLimit);
	if(*p) get_restOfLine(&p, &pOch->cmdOnSizeLimit);

	*ppRestOfConfLine = p;
	return(pOch);
}


/* Find a outchannel object based on name. Search
 * currently is case-senstive (should we change?).
 * returns pointer to outchannel object if found and
 * NULL otherwise.
 * rgerhards 2004-11-17
 */
struct outchannel *ochFind(char *pName, int iLenName)
{
	struct outchannel *pOch;

	assert(pName != NULL);

	pOch = ochRoot;
	while(pOch != NULL &&
	      !(pOch->iLenName == iLenName &&
	        !strcmp(pOch->pszName, pName)
	        ))
		{
			pOch = pOch->pNext;
		}
	return(pOch);
}

/* Destroy the outchannel structure. This is for de-initialization
 * at program end. Everything is deleted.
 * rgerhards 2005-02-22
 */
void ochDeleteAll(void)
{
	struct outchannel *pOch, *pOchDel;

	pOch = ochRoot;
	while(pOch != NULL) {
		dbgprintf("Delete Outchannel: Name='%s'\n ", pOch->pszName == NULL? "NULL" : pOch->pszName);
		pOchDel = pOch;
		pOch = pOch->pNext;
		if(pOchDel->pszName != NULL)
			free(pOchDel->pszName);
		free(pOchDel);
	}
}


/* Print the outchannel structure. This is more or less a 
 * debug or test aid, but anyhow I think it's worth it...
 */
void ochPrintList(void)
{
	struct outchannel *pOch;

	pOch = ochRoot;
	while(pOch != NULL) {
		dbgprintf("Outchannel: Name='%s'\n", pOch->pszName == NULL? "NULL" : pOch->pszName);
		dbgprintf("\tFile Template: '%s'\n", pOch->pszFileTemplate == NULL ? "NULL" : (char*) pOch->pszFileTemplate);
		dbgprintf("\tMax Size.....: %lu\n", pOch->uSizeLimit);
		dbgprintf("\tOnSizeLimtCmd: '%s'\n", pOch->cmdOnSizeLimit == NULL ? "NULL" : (char*) pOch->cmdOnSizeLimit);
		pOch = pOch->pNext; /* done, go next */
	}
}
/*
 * vi:set ai:
 */