X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Frrd_daemon.c;h=40785b00778cc19ffc40b3e97bc687f553f5b4a9;hb=6c6bd6077fbc7dd9caa23e73e41b62af346e1fbf;hp=3e9253017906dfab217dfa864fd6858f2750171f;hpb=86aa7285af4982db2d467680157a2114fb0096a0;p=rrdtool.git

diff --git a/src/rrd_daemon.c b/src/rrd_daemon.c
index 3e92530..40785b0 100644
--- a/src/rrd_daemon.c
+++ b/src/rrd_daemon.c
@@ -117,7 +117,7 @@ struct listen_socket_s
   socket_privilege privilege;
 
   /* state for BATCH processing */
-  int batch_mode;
+  time_t batch_start;
   int batch_cmd;
 
   /* buffered IO */
@@ -286,7 +286,7 @@ static void install_signal_handlers(void) /* {{{ */
 
 } /* }}} void install_signal_handlers */
 
-static int open_pidfile(void) /* {{{ */
+static int open_pidfile(char *action, int oflag) /* {{{ */
 {
   int fd;
   char *file;
@@ -295,14 +295,52 @@ static int open_pidfile(void) /* {{{ */
     ? config_pid_file
     : LOCALSTATEDIR "/run/rrdcached.pid";
 
-  fd = open(file, O_CREAT|O_EXCL|O_WRONLY, S_IRUSR|S_IRGRP|S_IROTH);
+  fd = open(file, oflag, S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH);
   if (fd < 0)
-    fprintf(stderr, "FATAL: cannot create '%s' (%s)\n",
-            file, rrd_strerror(errno));
+    fprintf(stderr, "rrdcached: can't %s pid file '%s' (%s)\n",
+            action, file, rrd_strerror(errno));
 
   return(fd);
 } /* }}} static int open_pidfile */
 
+/* check existing pid file to see whether a daemon is running */
+static int check_pidfile(void)
+{
+  int pid_fd;
+  pid_t pid;
+  char pid_str[16];
+
+  pid_fd = open_pidfile("open", O_RDWR);
+  if (pid_fd < 0)
+    return pid_fd;
+
+  if (read(pid_fd, pid_str, sizeof(pid_str)) <= 0)
+    return -1;
+
+  pid = atoi(pid_str);
+  if (pid <= 0)
+    return -1;
+
+  /* another running process that we can signal COULD be
+   * a competing rrdcached */
+  if (pid != getpid() && kill(pid, 0) == 0)
+  {
+    fprintf(stderr,
+            "FATAL: Another rrdcached daemon is running?? (pid %d)\n", pid);
+    close(pid_fd);
+    return -1;
+  }
+
+  lseek(pid_fd, 0, SEEK_SET);
+  ftruncate(pid_fd, 0);
+
+  fprintf(stderr,
+          "rrdcached: removed stale PID file (no rrdcached on pid %d)\n"
+          "rrdcached: starting normally.\n", pid);
+
+  return pid_fd;
+} /* }}} static int check_pidfile */
+
 static int write_pidfile (int fd) /* {{{ */
 {
   pid_t pid;
@@ -405,7 +443,7 @@ static int add_response_info(listen_socket_t *sock, char *fmt, ...) /* {{{ */
   int len;
 
   if (sock == NULL) return 0; /* journal replay mode */
-  if (sock->batch_mode) return 0; /* no extra info returned when in BATCH */
+  if (sock->batch_start) return 0; /* no extra info returned when in BATCH */
 
   va_start(argp, fmt);
 #ifdef HAVE_VSNPRINTF
@@ -453,7 +491,7 @@ static int send_response (listen_socket_t *sock, response_code rc,
 
   if (sock == NULL) return rc;  /* journal replay mode */
 
-  if (sock->batch_mode)
+  if (sock->batch_start)
   {
     if (rc == RESP_OK)
       return rc; /* no response on success during BATCH */
@@ -478,7 +516,7 @@ static int send_response (listen_socket_t *sock, response_code rc,
   len += rclen;
 
   /* append the result to the wbuf, don't write to the user */
-  if (sock->batch_mode)
+  if (sock->batch_start)
     return add_to_wbuf(sock, buffer, len);
 
   /* first write must be complete */
@@ -748,8 +786,8 @@ static void *queue_thread_main (void *args __attribute__((unused))) /* {{{ */
       flush_old_values (config_write_interval);
 
       /* Determine the time of the next cache flush. */
-      while (next_flush.tv_sec <= now.tv_sec)
-        next_flush.tv_sec += config_flush_interval;
+      next_flush.tv_sec =
+        now.tv_sec + next_flush.tv_sec % config_flush_interval;
 
       /* unlock the cache while we rotate so we don't block incoming
        * updates if the fsync() blocks on disk I/O */
@@ -956,6 +994,26 @@ err:
   return 0;
 } /* }}} static int check_file_access */
 
+/* when using a base dir, convert relative paths to absolute paths.
+ * if necessary, modifies the "filename" pointer to point
+ * to the new path created in "tmp".  "tmp" is provided
+ * by the caller and sizeof(tmp) must be >= PATH_MAX.
+ *
+ * this allows us to optimize for the expected case (absolute path)
+ * with a no-op.
+ */
+static void get_abs_path(char **filename, char *tmp)
+{
+  assert(tmp != NULL);
+  assert(filename != NULL && *filename != NULL);
+
+  if (config_base_dir == NULL || **filename == '/')
+    return;
+
+  snprintf(tmp, PATH_MAX, "%s/%s", config_base_dir, *filename);
+  *filename = tmp;
+} /* }}} static int get_abs_path */
+
 /* returns 1 if we have the required privilege level,
  * otherwise issue an error to the user on sock */
 static int has_privilege (listen_socket_t *sock, /* {{{ */
@@ -1183,7 +1241,7 @@ static int handle_request_stats (listen_socket_t *sock) /* {{{ */
 static int handle_request_flush (listen_socket_t *sock, /* {{{ */
     char *buffer, size_t buffer_size)
 {
-  char *file;
+  char *file, file_tmp[PATH_MAX];
   int status;
 
   status = buffer_get_field (&buffer, &buffer_size, &file);
@@ -1197,6 +1255,7 @@ static int handle_request_flush (listen_socket_t *sock, /* {{{ */
     stats_flush_received++;
     pthread_mutex_unlock(&stats_lock);
 
+    get_abs_path(&file, file_tmp);
     if (!check_file_access(file, sock)) return 0;
 
     status = flush_file (file);
@@ -1221,7 +1280,7 @@ static int handle_request_flush (listen_socket_t *sock, /* {{{ */
 
   /* NOTREACHED */
   assert(1==0);
-} /* }}} int handle_request_slurp */
+} /* }}} int handle_request_flush */
 
 static int handle_request_flushall(listen_socket_t *sock) /* {{{ */
 {
@@ -1244,7 +1303,7 @@ static int handle_request_pending(listen_socket_t *sock, /* {{{ */
                                   char *buffer, size_t buffer_size)
 {
   int status;
-  char *file;
+  char *file, file_tmp[PATH_MAX];
   cache_item_t *ci;
 
   status = buffer_get_field(&buffer, &buffer_size, &file);
@@ -1256,6 +1315,8 @@ static int handle_request_pending(listen_socket_t *sock, /* {{{ */
   if (status <= 0)
     return status;
 
+  get_abs_path(&file, file_tmp);
+
   pthread_mutex_lock(&cache_lock);
   ci = g_tree_lookup(cache_tree, file);
   if (ci == NULL)
@@ -1275,7 +1336,7 @@ static int handle_request_forget(listen_socket_t *sock, /* {{{ */
                                  char *buffer, size_t buffer_size)
 {
   int status;
-  char *file;
+  char *file, file_tmp[PATH_MAX];
 
   status = buffer_get_field(&buffer, &buffer_size, &file);
   if (status != 0)
@@ -1286,6 +1347,7 @@ static int handle_request_forget(listen_socket_t *sock, /* {{{ */
   if (status <= 0)
     return status;
 
+  get_abs_path(&file, file_tmp);
   if (!check_file_access(file, sock)) return 0;
 
   pthread_mutex_lock(&cache_lock);
@@ -1308,19 +1370,17 @@ static int handle_request_forget(listen_socket_t *sock, /* {{{ */
 } /* }}} static int handle_request_forget */
 
 static int handle_request_update (listen_socket_t *sock, /* {{{ */
-    char *buffer, size_t buffer_size)
+                                  time_t now,
+                                  char *buffer, size_t buffer_size)
 {
-  char *file;
+  char *file, file_tmp[PATH_MAX];
   int values_num = 0;
   int bad_timestamps = 0;
   int status;
   char orig_buf[CMD_MAX];
 
-  time_t now;
   cache_item_t *ci;
 
-  now = time (NULL);
-
   status = has_privilege(sock, PRIV_HIGH);
   if (status <= 0)
     return status;
@@ -1337,6 +1397,7 @@ static int handle_request_update (listen_socket_t *sock, /* {{{ */
   stats_updates_received++;
   pthread_mutex_unlock(&stats_lock);
 
+  get_abs_path(&file, file_tmp);
   if (!check_file_access(file, sock)) return 0;
 
   pthread_mutex_lock (&cache_lock);
@@ -1464,6 +1525,9 @@ static int handle_request_update (listen_socket_t *sock, /* {{{ */
 
   if (values_num < 1)
   {
+    /* journal replay mode */
+    if (sock == NULL) return RESP_ERR;
+
     /* if we had only one update attempt, then return the full
        error message... try to get the most information out
        of the limited error space allowed by the protocol
@@ -1487,7 +1551,7 @@ static int handle_request_update (listen_socket_t *sock, /* {{{ */
 /* we came across a "WROTE" entry during journal replay.
  * throw away any values that we have accumulated for this file
  */
-static int handle_request_wrote (const char *buffer) /* {{{ */
+static int handle_request_wrote (const char *buffer, time_t now) /* {{{ */
 {
   int i;
   cache_item_t *ci;
@@ -1510,7 +1574,7 @@ static int handle_request_wrote (const char *buffer) /* {{{ */
     free(ci->values);
   }
 
-  wipe_ci_values(ci, time(NULL));
+  wipe_ci_values(ci, now);
   remove_from_queue(ci);
 
   pthread_mutex_unlock(&cache_lock);
@@ -1521,12 +1585,12 @@ static int handle_request_wrote (const char *buffer) /* {{{ */
 static int batch_start (listen_socket_t *sock) /* {{{ */
 {
   int status;
-  if (sock->batch_mode)
+  if (sock->batch_start)
     return send_response(sock, RESP_ERR, "Already in BATCH\n");
 
   status = send_response(sock, RESP_OK,
                          "Go ahead.  End with dot '.' on its own line.\n");
-  sock->batch_mode = 1;
+  sock->batch_start = time(NULL);
   sock->batch_cmd = 0;
 
   return status;
@@ -1535,14 +1599,15 @@ static int batch_start (listen_socket_t *sock) /* {{{ */
 /* finish "BATCH" processing and return results to the client */
 static int batch_done (listen_socket_t *sock) /* {{{ */
 {
-  assert(sock->batch_mode);
-  sock->batch_mode = 0;
+  assert(sock->batch_start);
+  sock->batch_start = 0;
   sock->batch_cmd  = 0;
   return send_response(sock, RESP_OK, "errors\n");
 } /* }}} static int batch_done */
 
 /* if sock==NULL, we are in journal replay mode */
 static int handle_request (listen_socket_t *sock, /* {{{ */
+                           time_t now,
                            char *buffer, size_t buffer_size)
 {
   char *buffer_ptr;
@@ -1560,15 +1625,15 @@ static int handle_request (listen_socket_t *sock, /* {{{ */
     return (-1);
   }
 
-  if (sock != NULL && sock->batch_mode)
+  if (sock != NULL && sock->batch_start)
     sock->batch_cmd++;
 
   if (strcasecmp (command, "update") == 0)
-    return (handle_request_update (sock, buffer_ptr, buffer_size));
+    return (handle_request_update (sock, now, buffer_ptr, buffer_size));
   else if (strcasecmp (command, "wrote") == 0 && sock == NULL)
   {
     /* this is only valid in replay mode */
-    return (handle_request_wrote (buffer_ptr));
+    return (handle_request_wrote (buffer_ptr, now));
   }
   else if (strcasecmp (command, "flush") == 0)
     return (handle_request_flush (sock, buffer_ptr, buffer_size));
@@ -1584,7 +1649,7 @@ static int handle_request (listen_socket_t *sock, /* {{{ */
     return (handle_request_help (sock, buffer_ptr, buffer_size));
   else if (strcasecmp (command, "batch") == 0 && sock != NULL)
     return batch_start(sock);
-  else if (strcasecmp (command, ".") == 0 && sock != NULL && sock->batch_mode)
+  else if (strcasecmp (command, ".") == 0 && sock != NULL && sock->batch_start)
     return batch_done(sock);
   else
     return send_response(sock, RESP_ERR, "Unknown command: %s\n", command);
@@ -1700,6 +1765,7 @@ static int journal_replay (const char *file) /* {{{ */
   int fail_cnt = 0;
   uint64_t line = 0;
   char entry[CMD_MAX];
+  time_t now;
 
   if (file == NULL) return 0;
 
@@ -1752,6 +1818,8 @@ static int journal_replay (const char *file) /* {{{ */
   else
     RRDD_LOG(LOG_NOTICE, "replaying from journal: %s", file);
 
+  now = time(NULL);
+
   while(!feof(fh))
   {
     size_t entry_len;
@@ -1773,7 +1841,7 @@ static int journal_replay (const char *file) /* {{{ */
 
     entry[entry_len - 1] = '\0';
 
-    if (handle_request(NULL, entry, entry_len) == 0)
+    if (handle_request(NULL, now, entry, entry_len) == 0)
       ++entry_cnt;
     else
       ++fail_cnt;
@@ -1864,6 +1932,7 @@ static void *connection_thread_main (void *args) /* {{{ */
     char *cmd;
     ssize_t cmd_len;
     ssize_t rbytes;
+    time_t now;
 
     struct pollfd pollfd;
     int status;
@@ -1907,9 +1976,14 @@ static void *connection_thread_main (void *args) /* {{{ */
 
     sock->next_read += rbytes;
 
+    if (sock->batch_start)
+      now = sock->batch_start;
+    else
+      now = time(NULL);
+
     while ((cmd = next_cmd(sock, &cmd_len)) != NULL)
     {
-      status = handle_request (sock, cmd, cmd_len+1);
+      status = handle_request (sock, now, cmd, cmd_len+1);
       if (status != 0)
         goto out_close;
     }
@@ -2285,13 +2359,16 @@ static void *listen_thread_main (void *args __attribute__((unused))) /* {{{ */
 static int daemonize (void) /* {{{ */
 {
   int status;
-  int fd;
+  int pid_fd;
   char *base_dir;
 
   daemon_uid = geteuid();
 
-  fd = open_pidfile();
-  if (fd < 0) return fd;
+  pid_fd = open_pidfile("create", O_CREAT|O_EXCL|O_WRONLY);
+  if (pid_fd < 0)
+    pid_fd = check_pidfile();
+  if (pid_fd < 0)
+    return pid_fd;
 
   if (!stay_foreground)
   {
@@ -2344,7 +2421,7 @@ static int daemonize (void) /* {{{ */
     return (-1);
   }
 
-  status = write_pidfile (fd);
+  status = write_pidfile (pid_fd);
   return status;
 } /* }}} int daemonize */
 
@@ -2460,6 +2537,7 @@ static int read_options (int argc, char **argv) /* {{{ */
       case 'b':
       {
         size_t len;
+        char base_realpath[PATH_MAX];
 
         if (config_base_dir != NULL)
           free (config_base_dir);
@@ -2470,6 +2548,27 @@ static int read_options (int argc, char **argv) /* {{{ */
           return (3);
         }
 
+        /* make sure that the base directory is not resolved via
+         * symbolic links.  this makes some performance-enhancing
+         * assumptions possible (we don't have to resolve paths
+         * that start with a "/")
+         */
+        if (realpath(config_base_dir, base_realpath) == NULL)
+        {
+          fprintf (stderr, "Invalid base directory '%s'.\n", config_base_dir);
+          return 5;
+        }
+        else if (strncmp(config_base_dir,
+                         base_realpath, sizeof(base_realpath)) != 0)
+        {
+          fprintf(stderr,
+                  "Base directory (-b) resolved via file system links!\n"
+                  "Please consult rrdcached '-b' documentation!\n"
+                  "Consider specifying the real directory (%s)\n",
+                  base_realpath);
+          return 5;
+        }
+
         len = strlen (config_base_dir);
         while ((len > 0) && (config_base_dir[len - 1] == '/'))
         {