src/bin/lttng-relayd/cmd-2-1.c

   1 /*
   2  * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com>
   3  * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
   4  * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  *
   6  * SPDX-License-Identifier: GPL-2.0-only
   7  *
   8  */
   9
  10 #define _LGPL_SOURCE
  11
  12 #include <common/common.h>
  13 #include <common/sessiond-comm/relayd.h>
  14 #include <common/compat/string.h>
  15 #include <lttng/constant.h>
  16
  17 #include "cmd-2-1.h"
  18 #include "utils.h"
  19
  20 /*
  21  * cmd_recv_stream_2_1 allocates path_name and channel_name.
  22  */
  23 int cmd_recv_stream_2_1(const struct lttng_buffer_view *payload,
  24                 char **ret_path_name, char **ret_channel_name)
  25 {
  26         int ret;
  27         struct lttcomm_relayd_add_stream stream_info;
  28         char *path_name = NULL;
  29         char *channel_name = NULL;
  30         size_t len;
  31
  32         if (payload->size < sizeof(stream_info)) {
  33                 ERR("Unexpected payload size in \"cmd_recv_stream_2_1\": expected >= %zu bytes, got %zu bytes",
  34                                 sizeof(stream_info), payload->size);
  35                 ret = -1;
  36                 goto error;
  37         }
  38         memcpy(&stream_info, payload->data, sizeof(stream_info));
  39
  40         len = lttng_strnlen(stream_info.pathname, sizeof(stream_info.pathname));
  41         /* Ensure that NULL-terminated and fits in local filename length. */
  42         if (len == sizeof(stream_info.pathname) || len >= LTTNG_NAME_MAX) {
  43                 ret = -ENAMETOOLONG;
  44                 ERR("Path name too long");
  45                 goto error;
  46         }
  47         path_name = strdup(stream_info.pathname);
  48         if (!path_name) {
  49                 PERROR("Path name allocation");
  50                 ret = -ENOMEM;
  51                 goto error;
  52         }
  53         len = lttng_strnlen(stream_info.channel_name, sizeof(stream_info.channel_name));
  54         if (len == sizeof(stream_info.channel_name) || len >= DEFAULT_STREAM_NAME_LEN) {
  55                 ret = -ENAMETOOLONG;
  56                 ERR("Channel name too long");
  57                 goto error;
  58         }
  59         channel_name = strdup(stream_info.channel_name);
  60         if (!channel_name) {
  61                 ret = -errno;
  62                 PERROR("Channel name allocation");
  63                 goto error;
  64         }
  65
  66         *ret_path_name = path_name;
  67         *ret_channel_name = channel_name;
  68         return 0;
  69 error:
  70         free(path_name);
  71         free(channel_name);
  72         return ret;
  73 }