-/*
- * Copyright (C) 2006 Andre Noll <maan@tuebingen.mpg.de>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
+/* Copyright (C) 2006 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
/** \file user_list.c User handling for para_server. */
#include "list.h"
#include "user_list.h"
-static struct list_head user_list;
+INITIALIZED_LIST_HEAD(user_list);
/*
- * Fill the list of users known to para_server.
+ * Wrapper for fgets(3).
+ *
+ * Unlike fgets(3), an integer value is returned. On success, this function
+ * returns 1. On errors, -E_FGETS is returned. A zero return value indicates an
+ * end of file condition.
+ */
+static int xfgets(char *line, int size, FILE *f)
+{
+again:
+ if (fgets(line, size, f))
+ return 1;
+ if (feof(f))
+ return 0;
+ if (!ferror(f))
+ return -E_FGETS;
+ if (errno != EINTR) {
+ PARA_ERROR_LOG("%s\n", strerror(errno));
+ return -E_FGETS;
+ }
+ clearerr(f);
+ goto again;
+}
+
+/**
+ * Remove all entries from the user list.
+ *
+ * This is called on shutdown and when the user list is reloaded because the
+ * server received SIGHUP.
+ */
+void user_list_deplete(void)
+{
+ struct user *u, *tmpu;
+
+ list_for_each_entry_safe(u, tmpu, &user_list, node) {
+ list_del(&u->node);
+ free(u->name);
+ free_public_key(u->pubkey);
+ free(u);
+ }
+}
+
+/**
+ * Initialize the list of users allowed to connect to para_server.
+ *
+ * \param user_list_file The file containing access information.
*
- * Populates a linked list of all users in \a user_list_file. Returns on
- * success, calls exit() on errors.
+ * If this function is called for the second time, the contents of the
+ * previous call are discarded, i.e. the user list is reloaded.
+ *
+ * This function either succeeds or calls exit(3).
*/
-static void populate_user_list(char *user_list_file)
+void user_list_init(char *user_list_file)
{
int ret = -E_USERLIST;
FILE *file_ptr = fopen(user_list_file, "r");
+ struct user *u;
if (!file_ptr)
goto err;
+
+ user_list_deplete();
for (;;) {
int num;
char line[255];
/* keyword, name, key, perms */
char w[255], n[255], k[255], p[255], tmp[4][255];
- struct user *u;
struct asymmetric_key *pubkey;
- ret = para_fgets(line, sizeof(line), file_ptr);
+ ret = xfgets(line, sizeof(line), file_ptr);
if (ret <= 0)
break;
if (sscanf(line,"%200s %200s %200s %200s", w, n, k, p) < 3)
exit(EXIT_FAILURE);
}
-/**
- * Initialize the list of users allowed to connect to to para_server.
- *
- * \param user_list_file The file containing access information.
- *
- * If this function is called for the second time, the contents of the
- * previous call are discarded, i.e. the user list is reloaded.
- */
-void init_user_list(char *user_list_file)
-{
- struct user *u, *tmp;
- static int initialized;
-
- if (initialized) {
- list_for_each_entry_safe(u, tmp, &user_list, node) {
- list_del(&u->node);
- free(u->name);
- free_public_key(u->pubkey);
- free(u);
- }
- } else
- INIT_LIST_HEAD(&user_list);
- initialized = 1;
- populate_user_list(user_list_file);
-}
-
/**
* Lookup a user in the user list.
*
* \return A pointer to the corresponding user struct if the user was found, \p
* NULL otherwise.
*/
-struct user *lookup_user(const char *name)
+const struct user *user_list_lookup(const char *name)
{
- struct user *u;
+ const struct user *u;
list_for_each_entry(u, &user_list, node) {
if (strcmp(u->name, name))
continue;