krb5_fcc_generate_new is non-functional

File locking was non-existant in this code and fccs chained list was
not used at all. This resulted in an assertion failure when closing the
cache.  Code has been reorganized to parallel the code in krb5_fcc_resolve
for easier maintenence. 

Commented out test in t_cc.c has been updated to actually test this code.

ticket:new

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@19920 dc483132-0cff-0310-8789-dd5450dbe970

1 files changed, 87 insertions, 40 deletions

diff --git a/src/lib/krb5/ccache/cc_file.c b/src/lib/krb5/ccache/cc_file.c
index d238804c3d..49ba479434 100644
--- a/src/lib/krb5/ccache/cc_file.c
+++ b/src/lib/krb5/ccache/cc_file.c
@@ -1960,68 +1960,81 @@ krb5_fcc_generate_new (krb5_context context, krb5_ccache *id)
 {
      krb5_ccache lid;
      int ret;
-     krb5_error_code    retcode = 0;
+     krb5_error_code    kret = 0;
      char scratch[sizeof(TKT_ROOT)+6+1]; /* +6 for the scratch part, +1 for
 					    NUL */
      krb5_fcc_data *data;
      krb5_int16 fcc_fvno = htons(context->fcc_default_format);
      krb5_int16 fcc_flen = 0;
      int errsave, cnt;
+     struct fcc_set *setptr;
      
-     /* Allocate memory */
-     lid = (krb5_ccache) malloc(sizeof(struct _krb5_ccache));
-     if (lid == NULL)
-	  return KRB5_CC_NOMEM;
-
-     lid->ops = &krb5_fcc_ops;
+     /* Set master lock */
+     kret = k5_mutex_lock(&krb5int_cc_file_mutex);
+     if (kret)
+	 return kret;
 
      (void) strcpy(scratch, TKT_ROOT);
      (void) strcat(scratch, "XXXXXX");
      ret = mkstemp(scratch);
      if (ret == -1) {
+         k5_mutex_unlock(&krb5int_cc_file_mutex);
 	 return krb5_fcc_interpret(context, errno);
      }
 
-     lid->data = (krb5_pointer) malloc(sizeof(krb5_fcc_data));
-     if (lid->data == NULL) {
+     /* Allocate memory */
+     data = (krb5_pointer) malloc(sizeof(krb5_fcc_data));
+     if (data == NULL) {
 	  close(ret);
 	  unlink(scratch);
-	  krb5_xfree(lid);
+	  k5_mutex_unlock(&krb5int_cc_file_mutex);
 	  return KRB5_CC_NOMEM;
      }
 
-     ((krb5_fcc_data *) lid->data)->filename = (char *)
-	  malloc(strlen(scratch) + 1);
-     if (((krb5_fcc_data *) lid->data)->filename == NULL) {
+     data->filename = strdup(scratch);
+     if (data->filename == NULL) {
+          k5_mutex_unlock(&krb5int_cc_file_mutex);
+	  free(data);
 	  close(ret);
 	  unlink(scratch);
-	  krb5_xfree(((krb5_fcc_data *) lid->data));
-	  krb5_xfree(lid);
+	  k5_mutex_unlock(&krb5int_cc_file_mutex);
 	  return KRB5_CC_NOMEM;
      }
 
+     kret = k5_mutex_init(&data->lock);
+     if (kret) {
+       k5_mutex_unlock(&krb5int_cc_file_mutex);
+       free(data->filename);
+       free(data);
+       close(ret);
+       unlink(scratch);
+       return kret;
+     }
+     kret = k5_mutex_lock(&data->lock);
+     if (kret) {
+       k5_mutex_unlock(&krb5int_cc_file_mutex);
+       k5_mutex_destroy(&data->lock);
+       free(data->filename);
+       free(data);
+       close(ret);
+       unlink(scratch);
+       return kret;
+     }
+
      /*
       * The file is initially closed at the end of this call...
       */
-     ((krb5_fcc_data *) lid->data)->flags = 0;
-     ((krb5_fcc_data *) lid->data)->file = -1;
-     ((krb5_fcc_data *) lid->data)->valid_bytes = 0;
-     data = (krb5_fcc_data *) lid->data;
-
-     retcode = k5_mutex_init(&data->lock);
-     if (retcode) {
-	 close(ret);
-	 unlink(scratch);
-	 goto err_out;
-     }
+     data->flags = 0;
+     data->file = -1;
+     data->valid_bytes = 0;
+     /* data->version,mode filled in for real later */
+     data->version = data->mode = 0;
 
-     /* Set up the filename */
-     strcpy(((krb5_fcc_data *) lid->data)->filename, scratch);
 
      /* Ignore user's umask, set mode = 0600 */
 #ifndef HAVE_FCHMOD
 #ifdef HAVE_CHMOD
-     chmod(((krb5_fcc_data *) lid->data)->filename, S_IRUSR | S_IWUSR);
+     chmod(data->filename, S_IRUSR | S_IWUSR);
 #endif
 #else
      fchmod(ret, S_IRUSR | S_IWUSR);
@@ -2030,8 +2043,8 @@ krb5_fcc_generate_new (krb5_context context, krb5_ccache *id)
 	 != sizeof(fcc_fvno)) {
 	  errsave = errno;
 	  (void) close(ret);
-	  (void) unlink(((krb5_fcc_data *) lid->data)->filename);
-	  retcode = (cnt == -1) ? krb5_fcc_interpret(context, errsave) : KRB5_CC_IO;
+	  (void) unlink(data->filename);
+	  kret = (cnt == -1) ? krb5_fcc_interpret(context, errsave) : KRB5_CC_IO;
 	  goto err_out;
      }
      /* For version 4 we save a length for the rest of the header */
@@ -2040,29 +2053,63 @@ krb5_fcc_generate_new (krb5_context context, krb5_ccache *id)
 	      != sizeof(fcc_flen)) {
 	       errsave = errno;
 	       (void) close(ret);
-	       (void) unlink(((krb5_fcc_data *) lid->data)->filename);
-	       retcode = (cnt == -1) ? krb5_fcc_interpret(context, errsave) : KRB5_CC_IO;
+	       (void) unlink(data->filename);
+	       kret = (cnt == -1) ? krb5_fcc_interpret(context, errsave) : KRB5_CC_IO;
 	       goto err_out;
 	  }
      }
      if (close(ret) == -1) {
 	  errsave = errno;
-	  (void) unlink(((krb5_fcc_data *) lid->data)->filename);
-	  retcode = krb5_fcc_interpret(context, errsave);
+	  (void) unlink(data->filename);
+	  kret = krb5_fcc_interpret(context, errsave);
 	  goto err_out;
      }
-     *id = lid;
+
+
+     setptr = malloc(sizeof(struct fcc_set));
+     if (setptr == NULL) {
+       k5_mutex_unlock(&krb5int_cc_file_mutex);
+       k5_mutex_destroy(&data->lock);
+       free(data->filename);
+       free(data);
+       (void) close(ret);
+       (void) unlink(scratch);
+       return KRB5_CC_NOMEM;
+     }
+     setptr->refcount = 1;
+     setptr->data = data;
+     setptr->next = fccs;
+     fccs = setptr;
+     k5_mutex_unlock(&krb5int_cc_file_mutex);
+
+     k5_mutex_assert_locked(&data->lock);
+     k5_mutex_unlock(&data->lock);
+     lid = (krb5_ccache) malloc(sizeof(struct _krb5_ccache));
+     if (lid == NULL) {
+	 dereference(context, data);
+	 return KRB5_CC_NOMEM;
+     }
+
+     lid->ops = &krb5_fcc_ops;
+     lid->data = data;
+     lid->magic = KV5M_CCACHE;
+
      /* default to open/close on every trn - otherwise destroy 
 	will get as to state confused */
      ((krb5_fcc_data *) lid->data)->flags = KRB5_TC_OPENCLOSE;
+
+     *id = lid;
+
+       
      krb5_change_cache ();
      return KRB5_OK;
 
 err_out:
-     krb5_xfree(((krb5_fcc_data *) lid->data)->filename);
-     krb5_xfree(((krb5_fcc_data *) lid->data));
-     krb5_xfree(lid);
-     return retcode;
+     k5_mutex_unlock(&krb5int_cc_file_mutex);
+     k5_mutex_destroy(&data->lock);
+     free(data->filename);
+     free(data);
+     return kret;
 }
 
 /*