summaryrefslogtreecommitdiffstats
path: root/plugins/ompgsql/ompgsql.c
blob: 45e3c67407fff747cb847d174049a6cd93b64b16 (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
302
303
304
305
306
307
/* ompgsql.c
 * This is the implementation of the build-in output module for PgSQL.
 *
 * NOTE: read comments in module-template.h to understand how this file
 *       works!
 *
 * File begun on 2007-10-18 by sur5r (converted from ommysql.c)
 *
 * Copyright 2007 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 <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <signal.h>
#include <errno.h>
#include <time.h>
#include <libpq-fe.h>
#include "syslogd.h"
#include "syslogd-types.h"
#include "srUtils.h"
#include "template.h"
#include "ompgsql.h"
#include "module-template.h"

MODULE_TYPE_OUTPUT

/* internal structures
 */
DEF_OMOD_STATIC_DATA

typedef struct _instanceData {
	PGconn	*f_hpgsql;			/* handle to PgSQL */
	char	f_dbsrv[MAXHOSTNAMELEN+1];	/* IP or hostname of DB server*/ 
	char	f_dbname[_DB_MAXDBLEN+1];	/* DB name */
	char	f_dbuid[_DB_MAXUNAMELEN+1];	/* DB user */
	char	f_dbpwd[_DB_MAXPWDLEN+1];	/* DB user's password */
	ConnStatusType	eLastPgSQLStatus; 	/* last status from postgres */
} instanceData;


BEGINcreateInstance
CODESTARTcreateInstance
ENDcreateInstance


BEGINisCompatibleWithFeature
CODESTARTisCompatibleWithFeature
	if(eFeat == sFEATURERepeatedMsgReduction)
		iRet = RS_RET_OK;
ENDisCompatibleWithFeature


/* The following function is responsible for closing a
 * PgSQL connection.
 */
static void closePgSQL(instanceData *pData)
{
	assert(pData != NULL);

	if(pData->f_hpgsql != NULL) {	/* just to be on the safe side... */
		PQfinish(pData->f_hpgsql);
		pData->f_hpgsql = NULL;
	}
}

BEGINfreeInstance
CODESTARTfreeInstance
	closePgSQL(pData);
ENDfreeInstance


BEGINneedUDPSocket
CODESTARTneedUDPSocket
ENDneedUDPSocket


BEGINdbgPrintInstInfo
CODESTARTdbgPrintInstInfo
	/* nothing special here */
ENDdbgPrintInstInfo


BEGINonSelectReadyWrite
CODESTARTonSelectReadyWrite
ENDonSelectReadyWrite


BEGINgetWriteFDForSelect
CODESTARTgetWriteFDForSelect
ENDgetWriteFDForSelect


/* log a database error with descriptive message.
 * We check if we have a valid handle. If not, we simply
 * report an error, but can not be specific. RGerhards, 2007-01-30
 */
static void reportDBError(instanceData *pData, int bSilent)
{
	char errMsg[512];
	ConnStatusType ePgSQLStatus;

	assert(pData != NULL);
	bSilent=0;

	/* output log message */
	errno = 0;
	if(pData->f_hpgsql == NULL) {
		logerror("unknown DB error occured - could not obtain PgSQL handle");
	} else { /* we can ask pgsql for the error description... */
		ePgSQLStatus = PQstatus(pData->f_hpgsql);
		snprintf(errMsg, sizeof(errMsg)/sizeof(char), "db error (%d): %s\n", ePgSQLStatus,
				PQerrorMessage(pData->f_hpgsql));
		if(bSilent || ePgSQLStatus == pData->eLastPgSQLStatus)
			dbgprintf("pgsql, DBError(silent): %s\n", errMsg);
		else {
			pData->eLastPgSQLStatus = ePgSQLStatus;
			logerror(errMsg);
		}
	}
		
	return;
}


/* The following function is responsible for initializing a
 * PgSQL connection.
 */
static rsRetVal initPgSQL(instanceData *pData, int bSilent)
{
	DEFiRet;

	assert(pData != NULL);
	assert(pData->f_hpgsql == NULL);

	dbgprintf("host=%s dbname=%s uid=%s\n",pData->f_dbsrv,pData->f_dbname,pData->f_dbuid);

	/* Connect to database */
	if((pData->f_hpgsql=PQsetdbLogin(pData->f_dbsrv, NULL, NULL, NULL,
				pData->f_dbname, pData->f_dbuid, pData->f_dbpwd)) == NULL) {
		reportDBError(pData, bSilent);
		closePgSQL(pData); /* ignore any error we may get */
		iRet = RS_RET_SUSPENDED;
	}

	return iRet;
}


/* The following function writes the current log entry
 * to an established PgSQL session.
 */
rsRetVal writePgSQL(uchar *psz, instanceData *pData)
{
	DEFiRet;

	assert(psz != NULL);
	assert(pData != NULL);

	dbgprintf("writePgSQL: %s", psz);

	/* try insert */
	PQexec(pData->f_hpgsql, (char*)psz);
	if(PQstatus(pData->f_hpgsql) != CONNECTION_OK) {
		/* error occured, try to re-init connection and retry */
		closePgSQL(pData); /* close the current handle */
		CHKiRet(initPgSQL(pData, 0)); /* try to re-open */
		PQexec(pData->f_hpgsql, (char*)psz);
		if(PQstatus(pData->f_hpgsql) != CONNECTION_OK) { /* re-try insert */
			/* we failed, giving up for now */
			reportDBError(pData, 0);
			closePgSQL(pData); /* free ressources */
			ABORT_FINALIZE(RS_RET_SUSPENDED);
		}
	}

finalize_it:
	if(iRet == RS_RET_OK) {
		pData->eLastPgSQLStatus = CONNECTION_OK; /* reset error for error supression */
	}

	return iRet;
}


BEGINtryResume
CODESTARTtryResume
	if(pData->f_hpgsql == NULL) {
		iRet = initPgSQL(pData, 1);
	}
ENDtryResume

BEGINdoAction
CODESTARTdoAction
	dbgprintf("\n");
	iRet = writePgSQL(ppString[0], pData);
ENDdoAction


BEGINparseSelectorAct
	int iPgSQLPropErr = 0;
CODESTARTparseSelectorAct
CODE_STD_STRING_REQUESTparseSelectorAct(1)
	/* first check if this config line is actually for us
	 * The first test [*p == '>'] can be skipped if a module shall only
	 * support the newer slection syntax [:modname:]. This is in fact
	 * recommended for new modules. Please note that over time this part
	 * will be handled by rsyslogd itself, but for the time being it is
	 * a good compromise to do it at the module level.
	 * rgerhards, 2007-10-15
	 */

	if(!strncmp((char*) p, ":ompgsql:", sizeof(":ompgsql:") - 1)) {
		p += sizeof(":ompgsql:") - 1; /* eat indicator sequence (-1 because of '\0'!) */
	} else {
		ABORT_FINALIZE(RS_RET_CONFLINE_UNPROCESSED);
	}

	/* ok, if we reach this point, we have something for us */
	if((iRet = createInstance(&pData)) != RS_RET_OK)
		goto finalize_it;


	/* sur5r 2007-10-18: added support for PgSQL
	 * :ompgsql:server,dbname,userid,password
	 * Now we read the PgSQL connection properties 
	 * and verify that the properties are valid.
	 */
	if(getSubString(&p, pData->f_dbsrv, MAXHOSTNAMELEN+1, ','))
		iPgSQLPropErr++;
	dbgprintf("%p:%s\n",p,p);
	if(*pData->f_dbsrv == '\0')
		iPgSQLPropErr++;
	if(getSubString(&p, pData->f_dbname, _DB_MAXDBLEN+1, ','))
		iPgSQLPropErr++;
	if(*pData->f_dbname == '\0')
		iPgSQLPropErr++;
	if(getSubString(&p, pData->f_dbuid, _DB_MAXUNAMELEN+1, ','))
		iPgSQLPropErr++;
	if(*pData->f_dbuid == '\0')
		iPgSQLPropErr++;
	if(getSubString(&p, pData->f_dbpwd, _DB_MAXPWDLEN+1, ';'))
		iPgSQLPropErr++;
	/* now check for template
	 * We specify that the SQL option must be present in the template.
	 * This is for your own protection (prevent sql injection).
	 */
	if(*(p-1) == ';')
		--p;	/* TODO: the whole parsing of the MySQL module needs to be re-thought - but this here
			 *       is clean enough for the time being -- rgerhards, 2007-07-30
			 *       kept it for pgsql -- sur5r, 2007-10-19
			 */
	CHKiRet(cflineParseTemplateName(&p, *ppOMSR, 0, OMSR_RQD_TPL_OPT_SQL, (uchar*) " StdPgSQLFmt"));
	
	/* If we detect invalid properties, we disable logging, 
	 * because right properties are vital at this place.  
	 * Retries make no sense. 
	 */
	if (iPgSQLPropErr) { 
		logerror("Trouble with PgSQL connection properties. -PgSQL logging disabled");
		ABORT_FINALIZE(RS_RET_INVALID_PARAMS);
	} else {
		CHKiRet(initPgSQL(pData, 0));
	}

CODE_STD_FINALIZERparseSelectorAct
ENDparseSelectorAct

BEGINmodExit
CODESTARTmodExit
ENDmodExit


BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_OMOD_QUERIES
ENDqueryEtryPt


BEGINmodInit()
CODESTARTmodInit
	*ipIFVersProvided = 1; /* so far, we only support the initial definition */
CODEmodInit_QueryRegCFSLineHdlr
ENDmodInit
/*
 * vi:set ai:
 */