remove dependency from LDAP_FILT_MAXSIZ (and handle arbitrary size filters)

diff --git a/servers/slapd/back-ldap/config.c b/servers/slapd/back-ldap/config.c
index bcb209d9356598bcc4a635a99bf1c71d6d5f41e3..42e44659bfd049f8a02f4155f16d5227871b39f9 100644 (file)
--- a/servers/slapd/back-ldap/config.c
+++ b/servers/slapd/back-ldap/config.c
@@ -431,10 +431,40 @@ suffix_massage_config(
                 * walk the filter looking for DN-valued attributes,
                 * and only rewrite those that require rewriting
                 */
-               char vbuf[LDAP_FILT_MAXSIZ], rbuf[LDAP_FILT_MAXSIZ];
+               char    vbuf_[BUFSIZ], *vbuf = vbuf_,
+                       rbuf_[BUFSIZ], *rbuf = rbuf_;
+               int     len;
+
+               len = snprintf( vbuf, sizeof( vbuf_ ), 
+                               "(.*)%s\\)(.*)", nvnc->bv_val );
+               if ( len == -1 ) {
+                       /* 
+                        * traditional behavior: snprintf returns -1 
+                        * if buffer is insufficient
+                        */
+                       return -1;
+
+               } else if ( len >= sizeof( vbuf_ ) ) {
+                       /* 
+                        * C99: snprintf returns the required size 
+                        */
+                       vbuf = ch_malloc( len + 1 );
+                       len = snprintf( vbuf, len,
+                                       "(.*)%s\\)(.*)", nvnc->bv_val );
+                       assert( len > 0 );
+               }
+
+               len = snprintf( rbuf, sizeof( rbuf_ ), "%%1%s)%%2", 
+                               nrnc->bv_val );
+               if ( len == -1 ) {
+                       return -1;
 
-               snprintf( vbuf, sizeof( vbuf ), "(.*)%s\\)(.*)", nvnc->bv_val );
-               snprintf( rbuf, sizeof( rbuf ), "%%1%s)%%2", nrnc->bv_val );
+               } else if ( len >= sizeof( rbuf_ ) ) {
+                       rbuf = ch_malloc( len + 1 );
+                       len = snprintf( rbuf, sizeof( rbuf_ ), "%%1%s)%%2", 
+                                       nrnc->bv_val );
+                       assert( len > 0 );
+               }
                
                rargv[ 0 ] = "rewriteRule";
                rargv[ 1 ] = vbuf;
@@ -442,6 +472,14 @@ suffix_massage_config(
                rargv[ 3 ] = ":";
                rargv[ 4 ] = NULL;
                rewrite_parse( info, "<suffix massage>", ++line, 4, rargv );
+
+               if ( vbuf != vbuf_ ) {
+                       ch_free( vbuf );
+               }
+
+               if ( rbuf != rbuf_ ) {
+                       ch_free( rbuf );
+               }
        }
 #endif /* rewrite filters */