lib/parse_ini.[ch]: Simplify code

Rewrite the code that looks up the INI configuration file path (used by
the Extra-Opts feature) in order to improve readability.  The behaviour
should not have changed.

lib/parse_ini.c

@@ -40,6 +40,23 @@ typedef struct {
 	char *stanza;
 } np_ini_info;
 
+static char *default_ini_file_names[] = {
+	"plugins.ini",
+	"nagios-plugins.ini",
+	NULL
+};
+
+static char *default_ini_path_names[] = {
+	"/etc/nagios/plugins.ini",
+	"/usr/local/nagios/etc/plugins.ini",
+	"/usr/local/etc/nagios/plugins.ini",
+	"/etc/opt/nagios/plugins.ini",
+	"/etc/nagios-plugins.ini",
+	"/usr/local/etc/nagios-plugins.ini",
+	"/etc/opt/nagios-plugins.ini",
+	NULL
+};
+
 /* eat all characters from a FILE pointer until n is encountered */
 #define GOBBLE_TO(f, c, n) do { (c)=fgetc((f)); } while((c)!=EOF && (c)!=(n))
 
@@ -49,8 +66,6 @@ static int read_defaults(FILE *f, const char *stanza, np_arg_list **opts);
 static int add_option(FILE *f, np_arg_list **optlst);
 /* internal function to find default file */
 static char* default_file(void);
-/* internal function to test files access */
-static int test_file(const char* env, int len, const char* file, char* temp_file);
 
 /* parse_locator decomposes a string of the form
  * 	[stanza][@filename]
@@ -72,18 +87,17 @@ static void parse_locator(const char *locator, const char *def_stanza, np_ini_in
 	} else { /* otherwise we use the default stanza */
 		i->stanza=strdup(def_stanza);
 	}
+	if(i->stanza==NULL){
+		die(STATE_UNKNOWN, _("malloc() failed!\n"));
+	}
 	/* if there is no @file part */
 	if(stanza_len==locator_len){
 		i->file=default_file();
-		if(strcmp(i->file, "") == 0){
-			die(STATE_UNKNOWN, _("Cannot find '%s' or '%s' in any standard location.\n"), NP_DEFAULT_INI_FILENAME1, NP_DEFAULT_INI_FILENAME2);
-		}
 	} else {
 		i->file=strdup(&(locator[stanza_len+1]));
 	}
-
-	if(i->file==NULL || i->stanza==NULL){
-		die(STATE_UNKNOWN, _("malloc() failed!\n"));
+	if(i->file==NULL || i->file[0]=='\0'){
+		die(STATE_UNKNOWN, _("Cannot find config file in any standard location.\n"));
 	}
 }
 
@@ -317,71 +331,36 @@ static int add_option(FILE *f, np_arg_list **optlst){
 	return 0;
 }
 
-static char* default_file(void){
-	struct stat sb;
-	char *np_env=NULL, *default_file=NULL;
-	char temp_file[MAX_INPUT_BUFFER];
-	size_t len;
-
-	if((np_env=getenv("NAGIOS_CONFIG_PATH"))!=NULL) {
-		/* skip any starting colon... */
-		while(*np_env==':') np_env++;
-		/* Look for NP_DEFAULT_INI_FILENAME1 and NP_DEFAULT_INI_FILENAME2 in
-		 * every PATHs defined (colon-separated).
-		 */
-		while((len=strcspn(np_env,":"))>0){
-			/* Test NP_DEFAULT_INI_FILENAME[1-2] in current np_env token */
-			if(test_file(np_env,len,NP_DEFAULT_INI_FILENAME1,temp_file)==1 ||
-			   test_file(np_env,len,NP_DEFAULT_INI_FILENAME2,temp_file)==1){
-				default_file=strdup(temp_file);
-				break;
+static char *default_file_in_path(void){
+	char *config_path, **file;
+	char *dir, *ini_file, *tokens;
+
+	if((config_path=getenv("NAGIOS_CONFIG_PATH"))==NULL)
+		return NULL;
+
+	if((tokens=strdup(config_path))==NULL)
+		die(STATE_UNKNOWN, _("Insufficient Memory"));
+	for(dir=strtok(tokens, ":"); dir!=NULL; dir=strtok(NULL, ":")){
+		for(file=default_ini_file_names; *file!=NULL; file++){
+			if((asprintf(&ini_file, "%s/%s", dir, *file))<0)
+				die(STATE_UNKNOWN, _("Insufficient Memory"));
+			if(access(ini_file, F_OK)==0){
+				free(tokens);
+				return ini_file;
 			}
-
-			/* Move on to the next token */
-			np_env+=len;
-			while(*np_env==':') np_env++;
-		} /* while(...) */
-	} /* if(getenv("NAGIOS_CONFIG_PATH")) */
-
-	/* Look for NP_DEFAULT_INI_FILENAME1 in NP_DEFAULT_INI_NAGIOS_PATH[1-4] */
-	if(!default_file){
-		if(test_file(NP_DEFAULT_INI_NAGIOS_PATH1,strlen(NP_DEFAULT_INI_NAGIOS_PATH1),NP_DEFAULT_INI_FILENAME1,temp_file)==1 ||
-		   test_file(NP_DEFAULT_INI_NAGIOS_PATH2,strlen(NP_DEFAULT_INI_NAGIOS_PATH2),NP_DEFAULT_INI_FILENAME1,temp_file)==1 ||
-		   test_file(NP_DEFAULT_INI_NAGIOS_PATH3,strlen(NP_DEFAULT_INI_NAGIOS_PATH3),NP_DEFAULT_INI_FILENAME1,temp_file)==1 ||
-		   test_file(NP_DEFAULT_INI_NAGIOS_PATH4,strlen(NP_DEFAULT_INI_NAGIOS_PATH4),NP_DEFAULT_INI_FILENAME1,temp_file)==1)
-			default_file=strdup(temp_file);
-	}
-
-	/* Look for NP_DEFAULT_INI_FILENAME2 in NP_DEFAULT_INI_PATH[1-3] */
-	if(!default_file){
-		if(test_file(NP_DEFAULT_INI_PATH1,strlen(NP_DEFAULT_INI_PATH1),NP_DEFAULT_INI_FILENAME2,temp_file)==1 ||
-		   test_file(NP_DEFAULT_INI_PATH2,strlen(NP_DEFAULT_INI_PATH2),NP_DEFAULT_INI_FILENAME2,temp_file)==1 ||
-		   test_file(NP_DEFAULT_INI_PATH3,strlen(NP_DEFAULT_INI_PATH3),NP_DEFAULT_INI_FILENAME2,temp_file)==1)
-			default_file=strdup(temp_file);
+		}
 	}
-
-	/* Return default_file or empty string (should return NULL if we want plugins
-	 * to die there)...
-	 */
-	if(default_file)
-		return default_file;
-	return "";
+	free(tokens);
+	return NULL;
 }
 
-/* put together len bytes from env and the filename and test for its
- * existence. Returns 1 if found, 0 if not and -1 if test wasn't performed.
- */
-static int test_file(const char* env, int len, const char* file, char* temp_file){
+static char *default_file(void){
+	char **p, *ini_file;
 
-	/* test if len + filelen + '/' + '\0' fits in temp_file */
-	if((len+strlen(file)+2)>MAX_INPUT_BUFFER)	return -1;
-
-	strncpy(temp_file,env,len);
-	temp_file[len]='\0';
-	strncat(temp_file,"/",len+1);
-	strncat(temp_file,file,len+strlen(file)+1);
-
-	if(access(temp_file, F_OK) == 0) return 1;
-	return 0;
+	if((ini_file=default_file_in_path())!=NULL)
+		return ini_file;
+	for(p=default_ini_path_names; *p!=NULL; p++)
+		if (access(*p, F_OK)==0)
+			return *p;
+	return NULL;
 }
-

lib/parse_ini.h

@@ -13,46 +13,6 @@ typedef struct np_arg_el {
 	struct np_arg_el *next;
 } np_arg_list;
 
-/* FIXME: This is in plugins/common.c. Should be eventually moved to lib/
- * (although for this particular one a configure settings should be ideal)
- */
-#ifndef MAX_INPUT_BUFFER
-# define MAX_INPUT_BUFFER 8192
-#endif /* MAX_INPUT_BUFFER */
-
-/* Filenames (see below) */
-#ifndef NP_DEFAULT_INI_FILENAME1
-# define NP_DEFAULT_INI_FILENAME1 "plugins.ini"
-#endif /* NP_DEFAULT_INI_FILENAME1 */
-#ifndef NP_DEFAULT_INI_FILENAME2
-# define NP_DEFAULT_INI_FILENAME2 "nagios-plugins.ini"
-#endif /* NP_DEFAULT_INI_FILENAME2 */
-
-/* Config paths ending in nagios (search for NP_DEFAULT_INI_FILENAME1) */
-#ifndef NP_DEFAULT_INI_NAGIOS_PATH1
-# define NP_DEFAULT_INI_NAGIOS_PATH1 "/etc/nagios"
-#endif /* NP_DEFAULT_INI_NAGIOS_PATH1 */
-#ifndef NP_DEFAULT_INI_NAGIOS_PATH2
-# define NP_DEFAULT_INI_NAGIOS_PATH2 "/usr/local/nagios/etc"
-#endif /* NP_DEFAULT_INI_NAGIOS_PATH2 */
-#ifndef NP_DEFAULT_INI_NAGIOS_PATH3
-# define NP_DEFAULT_INI_NAGIOS_PATH3 "/usr/local/etc/nagios"
-#endif /* NP_DEFAULT_INI_NAGIOS_PATH3 */
-#ifndef NP_DEFAULT_INI_NAGIOS_PATH4
-# define NP_DEFAULT_INI_NAGIOS_PATH4 "/etc/opt/nagios"
-#endif /* NP_DEFAULT_INI_NAGIOS_PATH4 */
-
-/* Config paths not ending in nagios (search for NP_DEFAULT_INI_FILENAME2) */
-#ifndef NP_DEFAULT_INI_PATH1
-# define NP_DEFAULT_INI_PATH1 "/etc"
-#endif /* NP_DEFAULT_INI_PATH1 */
-#ifndef NP_DEFAULT_INI_PATH2
-# define NP_DEFAULT_INI_PATH2 "/usr/local/etc"
-#endif /* NP_DEFAULT_INI_PATH2 */
-#ifndef NP_DEFAULT_INI_PATH3
-# define NP_DEFAULT_INI_PATH3 "/etc/opt"
-#endif /* NP_DEFAULT_INI_PATH3 */
-
 /* np_load_defaults: load the default configuration (if present) for
  * a plugin from the ini file
  */