added support for field-based text extraction in the property replacer.

This is untested so far (the evening came quicker than anticipated ;))

NEWS

@@ -1,11 +1,12 @@
 ---------------------------------------------------------------------------
-Version 1.12.2 (RGer), 2005-11-??
+Version 1.12.2 (RGer), 2005-12-??
 - fixed a bug in the RFC 3339 date formater. An extra space was added
   after the actual timestamp
 - added support for providing high-precision RFC3339 timestamps for
   (rsyslogd-)internally-generated messages
 - very (!) experimental support for syslog-protocol internet draft
   added
+- added support for field-extracting in the property replacer
 ---------------------------------------------------------------------------
 Version 1.12.1 (RGer), 2005-11-23
 - made multithreading work with BSD. Some signal-handling needed to be

syslogd.c

@@ -2670,7 +2670,6 @@ static rsRetVal aquirePROCIDFromTAG(struct msg *pM)
 	register int i;
 	int iRet;
 
-dprintf("PROCIDFromTAG: in\n");
 	assert(pM != NULL);
 	if(pM->pCSPROCID != NULL)
 		return RS_RET_OK; /* we are already done ;) */
@@ -2712,7 +2711,6 @@ dprintf("PROCIDFromTAG: in\n");
 	if((iRet = rsCStrFinish(pM->pCSPROCID)) != RS_RET_OK)
 		return iRet;
 
-dprintf("PROCIDFromTAG: out\n");
 	return RS_RET_OK;
 }
 
@@ -2976,6 +2974,9 @@ static char *MsgGetProp(struct msg *pMsg, struct templateEntry *pTpe,
 {
 	char *pName;
 	char *pRes; /* result pointer */
+	char *pBufStart;
+	char *pBuf;
+	int iLen;
 
 #ifdef	FEATURE_REGEXP
 	/* Variables necessary for regular expression matching */
@@ -3051,12 +3052,67 @@ static char *MsgGetProp(struct msg *pMsg, struct templateEntry *pTpe,
 	 */
 	
 	/* substring extraction */
-	if(pTpe->data.field.iFromPos != 0 || pTpe->data.field.iToPos != 0) {
+	/* first we check if we need to extract by field number
+	 * rgerhards, 2005-12-22
+	 */
+	if(pTpe->data.field.has_fields == 1) {
+		int iCurrFld;
+		char *pFld;
+		char *pFldEnd;
+		/* first, skip to the field in question. For now, a field
+		 * is made up of HT (tab) characters. This should be
+		 * configurable over time.
+		 */
+		iCurrFld = 1;
+		pFld = pRes;
+		while(*pFld && iCurrFld < pTpe->data.field.iFromPos) {
+			/* skip fields until the requested field or end of string is found */
+			while(*pFld && *pFld != '\t')
+				++pFld; /* skip to field terminator */
+			if(*pFld == '\t') {
+				++pFld; /* eat it */
+				++iCurrFld;
+			}
+		}
+		dprintf("field requested %d, field found %d\n", pTpe->data.field.iFromPos, iCurrFld);
+			
+		
+		if(iCurrFld == pTpe->data.field.iFromPos) {
+			/* field found, now extract it */
+			/* first of all, we need to find the end */
+			pFldEnd = pFld;
+			while(*pFldEnd && *pFldEnd != '\t')
+				++pFldEnd;
+			if(*pFldEnd == '\0')
+				--pFldEnd; /* back of to last real char */
+			/* we got our end pointer, now do the copy */
+			/* TODO: code copied from below, this is a candidate for a separate function */
+			iLen = pFldEnd - pFld + 1; /* the +1 is for an actual char, NOT \0! */
+dprintf("field len %d, start '%s'\n", iLen, pFld);
+			pBufStart = pBuf = malloc((iLen + 1) * sizeof(char));
+			if(pBuf == NULL) {
+				if(*pbMustBeFreed == 1)
+					free(pRes);
+				*pbMustBeFreed = 0;
+				return "**OUT OF MEMORY**";
+			}
+			/* now copy */
+			memcpy(pBuf, pFld, iLen);
+			pBuf[iLen] = '\0'; /* terminate it */
+			if(*pbMustBeFreed == 1)
+				free(pRes);
+			pRes = pBufStart;
+			*pbMustBeFreed = 1;
+		} else {
+			/* field not found, return error */
+			if(*pbMustBeFreed == 1)
+				free(pRes);
+			*pbMustBeFreed = 0;
+			return "**FIELD NOT FOUND**";
+		}
+	} else if(pTpe->data.field.iFromPos != 0 || pTpe->data.field.iToPos != 0) {
 		/* we need to obtain a private copy */
-		int iLen;
 		int iFrom, iTo;
-		char *pBufStart;
-		char *pBuf;
 		iFrom = pTpe->data.field.iFromPos;
 		iTo = pTpe->data.field.iToPos;
 		/* need to zero-base to and from (they are 1-based!) */

template.c

@@ -286,6 +286,14 @@ static int do_Parameter(char **pp, struct template *pTpl)
 		} else {
 			/* now we fall through the "regular" FromPos code */
 #endif /* #ifdef FEATURE_REGEXP */
+			if(*p == 'F') {
+				/* we have a field counter, so indicate it in the template */
+				++p; /* eat 'F' */
+				pTpe->data.field.has_fields = 1;
+			}
+			/* we now fall through, as this is only a modifier, but it is followed
+			 * by a count as usual. rgerhards, 2005-12-22
+			 */
 			iNum = 0;
 			while(isdigit(*p))
 				iNum = iNum * 10 + *p++ - '0';
@@ -314,7 +322,7 @@ static int do_Parameter(char **pp, struct template *pTpl)
 			/* TODO : this is hardcoded and cant be escaped, please change */
 			regex_end = strstr(p, "--end");
 			if (regex_end == NULL) {
-				dprintf("error: Cant find regex end in: '%s'\n", p);
+				dprintf("error: can not find regex end in: '%s'\n", p);
 				pTpe->data.field.has_regex = 0;
 			} else {
 				/* We get here ONLY if the regex end was found */
@@ -339,7 +347,7 @@ static int do_Parameter(char **pp, struct template *pTpl)
 				/* Now i compile the regex */
 				/* Remember that the re is an attribute of the Template entry */
 				if (regcomp(&(pTpe->data.field.re), regex_char, 0) != 0) {
-					dprintf("error: Cant compile regex: '%s'\n", regex_char);
+					dprintf("error: can not compile regex: '%s'\n", regex_char);
 					pTpe->data.field.has_regex = 2;
 				}
 
@@ -368,7 +376,7 @@ static int do_Parameter(char **pp, struct template *pTpl)
 	}
 
 	/* TODO: add more sanity checks. For now, we do the bare minimum */
-	if(pTpe->data.field.iToPos < pTpe->data.field.iFromPos) {
+	if((pTpe->data.field.has_fields == 0) && (pTpe->data.field.iToPos < pTpe->data.field.iFromPos)) {
 		iNum = pTpe->data.field.iToPos;
 		pTpe->data.field.iToPos = pTpe->data.field.iFromPos;
 		pTpe->data.field.iFromPos = iNum;
@@ -628,8 +636,11 @@ void tplPrintList(void)
 				if(pTpe->data.field.options.bDropLastLF) {
 				  	dprintf("[drop last LF in msg] ");
 				}
-				if(pTpe->data.field.iFromPos != 0 ||
-				   pTpe->data.field.iToPos != 0) {
+				if(pTpe->data.field.has_fields == 1) {
+				  	dprintf("[substring, field #%d only] ",
+						pTpe->data.field.iFromPos);
+				} else if(pTpe->data.field.iFromPos != 0 ||
+				          pTpe->data.field.iToPos != 0) {
 				  	dprintf("[substring, from character %d to %d] ",
 						pTpe->data.field.iFromPos,
 						pTpe->data.field.iToPos);

template.h

@@ -44,10 +44,11 @@ struct templateEntry {
 			char *pPropRepl;	/* pointer to property replacer string */
 			unsigned iFromPos;	/* for partial strings only chars from this position ... */
 			unsigned iToPos;	/* up to that one... */
-#ifdef FEATURE_REGEXP
-			regex_t re;	/* APR: this is the regular expression */
-			unsigned has_regex;
-#endif
+#ifdef FEATURE_REGEXP
+			regex_t re;	/* APR: this is the regular expression */
+			unsigned has_regex;
+#endif
+			unsigned has_fields; /* support for field-couting */
 			enum tplFormatTypes eDateFormat;
 			enum tplFormatCaseConvTypes eCaseConv;
 			struct { 		/* bit fields! */