src/bin/lttng-relayd/cmd-2-11.c

   1 /*
   2  * Copyright (C) 2018 - Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License, version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 51
  15  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _LGPL_SOURCE
  19 #include <assert.h>
  20 #include <inttypes.h>
  21
  22 #include <common/common.h>
  23 #include <common/sessiond-comm/relayd.h>
  24
  25 #include <common/compat/endian.h>
  26 #include <common/compat/string.h>
  27 #include <lttng/constant.h>
  28
  29 #include "cmd-2-11.h"
  30 #include "utils.h"
  31
  32 int cmd_create_session_2_11(const struct lttng_buffer_view *payload,
  33                 char *session_name, char *hostname,
  34                 uint32_t *live_timer, bool *snapshot,
  35                 lttng_uuid sessiond_uuid)
  36 {
  37         int ret;
  38         struct lttcomm_relayd_create_session_2_11 header;
  39         size_t header_len, received_names_size;
  40         struct lttng_buffer_view session_name_view;
  41         struct lttng_buffer_view hostname_view;
  42
  43         header_len = sizeof(header);
  44
  45         if (payload->size < header_len) {
  46                 ERR("Unexpected payload size in \"cmd_create_session_2_11\": expected >= %zu bytes, got %zu bytes",
  47                                 header_len, payload->size);
  48                 ret = -1;
  49                 goto error;
  50         }
  51         memcpy(&header, payload->data, header_len);
  52
  53         header.session_name_len = be32toh(header.session_name_len);
  54         header.hostname_len = be32toh(header.hostname_len);
  55         header.live_timer = be32toh(header.live_timer);
  56
  57         lttng_uuid_copy(sessiond_uuid, header.sessiond_uuid);
  58
  59         received_names_size = header.session_name_len + header.hostname_len;
  60         if (payload->size < header_len + received_names_size) {
  61                 ERR("Unexpected payload size in \"cmd_create_session_2_11\": expected >= %zu bytes, got %zu bytes",
  62                                 header_len + received_names_size, payload->size);
  63                 ret = -1;
  64                 goto error;
  65         }
  66
  67         /* Validate length against defined constant. */
  68         if (header.session_name_len > LTTNG_NAME_MAX) {
  69                 ret = -ENAMETOOLONG;
  70                 ERR("Length of session name (%" PRIu32 " bytes) received in create_session command exceeds maximum length (%d bytes)", header.session_name_len, LTTNG_NAME_MAX);
  71                 goto error;
  72         }
  73         if (header.hostname_len > LTTNG_HOST_NAME_MAX) {
  74                 ret = -ENAMETOOLONG;
  75                 ERR("Length of hostname (%" PRIu32 " bytes) received in create_session command exceeds maximum length (%d bytes)", header.hostname_len, LTTNG_HOST_NAME_MAX);
  76                 goto error;
  77         }
  78
  79         session_name_view = lttng_buffer_view_from_view(payload, header_len,
  80                         header.session_name_len);
  81         hostname_view = lttng_buffer_view_from_view(payload,
  82                         header_len + header.session_name_len, header.hostname_len);
  83
  84         /* Validate that names are NULL terminated. */
  85         if (session_name_view.data[session_name_view.size - 1] != '\0') {
  86                 ERR("cmd_create_session_2_11 session_name is invalid (not NULL terminated)");
  87                 ret = -1;
  88                 goto error;
  89         }
  90
  91         if (hostname_view.data[hostname_view.size - 1] != '\0') {
  92                 ERR("cmd_create_session_2_11 hostname is invalid (not NULL terminated)");
  93                 ret = -1;
  94                 goto error;
  95         }
  96
  97         /*
  98          * Length and null-termination check are already performed.
  99          * LTTNG_NAME_MAX and LTTNG_HOST_NAME_MAX max size are expected.
 100          */
 101         strcpy(session_name, session_name_view.data);
 102         strcpy(hostname, hostname_view.data);
 103
 104         *live_timer = header.live_timer;
 105         *snapshot = !!header.snapshot;
 106
 107         ret = 0;
 108
 109 error:
 110         return ret;
 111 }
 112
 113 /*
 114  * cmd_recv_stream_2_11 allocates path_name and channel_name.
 115  */
 116 int cmd_recv_stream_2_11(const struct lttng_buffer_view *payload,
 117                 char **ret_path_name, char **ret_channel_name,
 118                 uint64_t *tracefile_size, uint64_t *tracefile_count,
 119                 uint64_t *trace_archive_id)
 120 {
 121         int ret;
 122         struct lttcomm_relayd_add_stream_2_11 header;
 123         size_t header_len, received_names_size;
 124         struct lttng_buffer_view channel_name_view;
 125         struct lttng_buffer_view pathname_view;
 126         char *path_name = NULL;
 127         char *channel_name = NULL;
 128
 129         header_len = sizeof(header);
 130
 131         if (payload->size < header_len) {
 132                 ERR("Unexpected payload size in \"cmd_recv_stream_2_11\": expected >= %zu bytes, got %zu bytes",
 133                                 header_len, payload->size);
 134                 ret = -1;
 135                 goto error;
 136         }
 137         memcpy(&header, payload->data, header_len);
 138
 139         header.channel_name_len = be32toh(header.channel_name_len);
 140         header.pathname_len = be32toh(header.pathname_len);
 141         header.tracefile_size = be64toh(header.tracefile_size);
 142         header.tracefile_count = be64toh(header.tracefile_count);
 143         header.trace_archive_id = be64toh(header.trace_archive_id);
 144
 145         received_names_size = header.channel_name_len + header.pathname_len;
 146         if (payload->size < header_len + received_names_size) {
 147                 ERR("Unexpected payload size in \"cmd_recv_stream_2_11\": expected >= %zu bytes, got %zu bytes",
 148                                 header_len + received_names_size, payload->size);
 149                 ret = -1;
 150                 goto error;
 151         }
 152
 153         /* Validate length against defined constant. */
 154         if (header.channel_name_len > DEFAULT_STREAM_NAME_LEN) {
 155                 ret = -ENAMETOOLONG;
 156                 ERR("Channel name too long");
 157                 goto error;
 158         }
 159         if (header.pathname_len > LTTNG_NAME_MAX) {
 160                 ret = -ENAMETOOLONG;
 161                 ERR("Pathname too long");
 162                 goto error;
 163         }
 164
 165         /* Validate that names are (NULL terminated. */
 166         channel_name_view = lttng_buffer_view_from_view(payload, header_len,
 167                             header.channel_name_len);
 168         pathname_view = lttng_buffer_view_from_view(payload,
 169                         header_len + header.channel_name_len, header.pathname_len);
 170
 171         if (channel_name_view.data[channel_name_view.size - 1] != '\0') {
 172                 ERR("cmd_recv_stream_2_11 channel_name is invalid (not NULL terminated)");
 173                 ret = -1;
 174                 goto error;
 175         }
 176
 177         if (pathname_view.data[pathname_view.size - 1] != '\0') {
 178                 ERR("cmd_recv_stream_2_11 patname is invalid (not NULL terminated)");
 179                 ret = -1;
 180                 goto error;
 181         }
 182
 183         channel_name = strdup(channel_name_view.data);
 184         if (!channel_name) {
 185                 ret = -errno;
 186                 PERROR("Channel name allocation");
 187                 goto error;
 188         }
 189
 190         path_name = create_output_path(pathname_view.data);
 191         if (!path_name) {
 192                 PERROR("Path name allocation");
 193                 ret = -ENOMEM;
 194                 goto error;
 195         }
 196
 197         *tracefile_size = header.tracefile_size;
 198         *tracefile_count = header.tracefile_count;
 199         *trace_archive_id = header.trace_archive_id;
 200         *ret_path_name = path_name;
 201         *ret_channel_name = channel_name;
 202         /* Move ownership to caller */
 203         path_name = NULL;
 204         channel_name = NULL;
 205         ret = 0;
 206 error:
 207         free(channel_name);
 208         free(path_name);
 209         return ret;
 210 }