write ini-file lookup function + tests

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1962 f882894a-f735-0410-b71e-b25c423dba1c

1 files changed, 66 insertions, 12 deletions

diff --git a/lib/parse_ini.c b/lib/parse_ini.c
index e318ec3..67d8367 100644
--- a/lib/parse_ini.c
+++ b/lib/parse_ini.c
@@ -30,6 +30,10 @@
 #include "utils_base.h"
 #include <ctype.h>
 
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
 /* FIXME: N::P dies if section is not found */
 /* FIXME: N::P dies if config file is not found */
 
@@ -50,6 +54,8 @@ 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 stat() files */
+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]
@@ -296,23 +302,71 @@ static int add_option(FILE *f, np_arg_list **optlst){
 }
 
 static char* default_file(void){
-        char *np_env=NULL;
+        struct stat sb;
+        char *np_env=NULL, *default_file=NULL;
+        char temp_file[MAX_INPUT_BUFFER];
+        size_t len;
 
-        /* FIXME: STUB */
-        return "";
-#if 0
         if((np_env=getenv("NAGIOS_CONFIG_PATH"))!=NULL) {
+                /* skip ant 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;
+                        }
+
+                        /* 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);
         }
-        if !file_found
-                search NP_DEFAULT_INI_NAGIOS_PATH[1-4] for NP_DEFAULT_INI_FILENAME1;
-        if !file_found
-                search NP_DEFAULT_INI_PATH[1-3] for NP_DEFAULT_INI_FILENAME2;
-        if !file_found
-                return empty string (or null if we want to die);
-        return file name;
-#endif
+
+        /* Return default_file or empty string (should return NULL if we want to
+         * die there...
+         */
+        if(default_file)
+                return default_file;
+        return "";
+}
+
+/* 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){
+        struct stat sb;
+
+        /* test for len + filelen + '/' + '\0' */
+        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(stat(temp_file, &sb) != -1) return 1;
+        return 0;
 }