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, char *base_path,
  34                 uint32_t *live_timer, bool *snapshot,
  35                 uint64_t *id_sessiond, lttng_uuid sessiond_uuid,
  36                 bool *has_current_chunk, uint64_t *current_chunk_id,
  37                 time_t *creation_time,
  38                 bool *session_name_contains_creation_time)
  39 {
  40         int ret;
  41         struct lttcomm_relayd_create_session_2_11 header;
  42         size_t header_len, received_names_size, offset;
  43         struct lttng_buffer_view session_name_view;
  44         struct lttng_buffer_view hostname_view;
  45         struct lttng_buffer_view base_path_view;
  46
  47         header_len = sizeof(header);
  48
  49         if (payload->size < header_len) {
  50                 ERR("Unexpected payload size in \"cmd_create_session_2_11\": expected >= %zu bytes, got %zu bytes",
  51                                 header_len, payload->size);
  52                 ret = -1;
  53                 goto error;
  54         }
  55         memcpy(&header, payload->data, header_len);
  56
  57         header.session_name_len = be32toh(header.session_name_len);
  58         header.hostname_len = be32toh(header.hostname_len);
  59         header.base_path_len = be32toh(header.base_path_len);
  60         header.live_timer = be32toh(header.live_timer);
  61         header.current_chunk_id.value = be64toh(header.current_chunk_id.value);
  62         header.current_chunk_id.is_set = !!header.current_chunk_id.is_set;
  63         header.creation_time = be64toh(header.creation_time);
  64
  65         lttng_uuid_copy(sessiond_uuid, header.sessiond_uuid);
  66
  67         received_names_size = header.session_name_len + header.hostname_len +
  68                                 header.base_path_len;
  69         if (payload->size < header_len + received_names_size) {
  70                 ERR("Unexpected payload size in \"cmd_create_session_2_11\": expected >= %zu bytes, got %zu bytes",
  71                                 header_len + received_names_size, payload->size);
  72                 ret = -1;
  73                 goto error;
  74         }
  75
  76         /* Validate length against defined constant. */
  77         if (header.session_name_len > LTTNG_NAME_MAX) {
  78                 ret = -ENAMETOOLONG;
  79                 ERR("Length of session name (%" PRIu32 " bytes) received in create_session command exceeds maximum length (%d bytes)", header.session_name_len, LTTNG_NAME_MAX);
  80                 goto error;
  81         } else if (header.session_name_len == 0) {
  82                 ret = -EINVAL;
  83                 ERR("Illegal session name length of 0 received");
  84                 goto error;
  85         }
  86         if (header.hostname_len > LTTNG_HOST_NAME_MAX) {
  87                 ret = -ENAMETOOLONG;
  88                 ERR("Length of hostname (%" PRIu32 " bytes) received in create_session command exceeds maximum length (%d bytes)", header.hostname_len, LTTNG_HOST_NAME_MAX);
  89                 goto error;
  90         }
  91         if (header.base_path_len > LTTNG_PATH_MAX) {
  92                 ret = -ENAMETOOLONG;
  93                 ERR("Length of base_path (%" PRIu32 " bytes) received in create_session command exceeds maximum length (%d bytes)", header.base_path_len, PATH_MAX);
  94                 goto error;
  95         }
  96
  97         offset = header_len;
  98         session_name_view = lttng_buffer_view_from_view(payload, offset,
  99                         header.session_name_len);
 100         offset += header.session_name_len;
 101         hostname_view = lttng_buffer_view_from_view(payload,
 102                         offset, header.hostname_len);
 103         offset += header.hostname_len;
 104         base_path_view = lttng_buffer_view_from_view(payload,
 105                         offset, header.base_path_len);
 106
 107         /* Validate that names are NULL terminated. */
 108         if (session_name_view.data[session_name_view.size - 1] != '\0') {
 109                 ERR("cmd_create_session_2_11 session_name is invalid (not NULL terminated)");
 110                 ret = -1;
 111                 goto error;
 112         }
 113
 114         if (hostname_view.data[hostname_view.size - 1] != '\0') {
 115                 ERR("cmd_create_session_2_11 hostname is invalid (not NULL terminated)");
 116                 ret = -1;
 117                 goto error;
 118         }
 119
 120         if (base_path_view.size != 0 &&
 121                         base_path_view.data[base_path_view.size - 1] != '\0') {
 122                 ERR("cmd_create_session_2_11 base_path is invalid (not NULL terminated)");
 123                 ret = -1;
 124                 goto error;
 125         }
 126
 127         /*
 128          * Length and null-termination check are already performed.
 129          * LTTNG_NAME_MAX, LTTNG_HOST_NAME_MAX, and LTTNG_PATH_MAX max sizes are expected.
 130          */
 131         strcpy(session_name, session_name_view.data);
 132         strcpy(hostname, hostname_view.data);
 133         strcpy(base_path, base_path_view.size ? base_path_view.data : "");
 134
 135         *live_timer = header.live_timer;
 136         *snapshot = !!header.snapshot;
 137         *current_chunk_id = header.current_chunk_id.value;
 138         *has_current_chunk = header.current_chunk_id.is_set;
 139         *creation_time = (time_t) header.creation_time;
 140         *session_name_contains_creation_time =
 141                 header.session_name_contains_creation_time;
 142
 143         ret = 0;
 144
 145 error:
 146         return ret;
 147 }
 148
 149 /*
 150  * cmd_recv_stream_2_11 allocates path_name and channel_name.
 151  */
 152 int cmd_recv_stream_2_11(const struct lttng_buffer_view *payload,
 153                 char **ret_path_name, char **ret_channel_name,
 154                 uint64_t *tracefile_size, uint64_t *tracefile_count,
 155                 uint64_t *trace_archive_id)
 156 {
 157         int ret;
 158         struct lttcomm_relayd_add_stream_2_11 header;
 159         size_t header_len, received_names_size;
 160         struct lttng_buffer_view channel_name_view;
 161         struct lttng_buffer_view pathname_view;
 162         char *path_name = NULL;
 163         char *channel_name = NULL;
 164
 165         header_len = sizeof(header);
 166
 167         if (payload->size < header_len) {
 168                 ERR("Unexpected payload size in \"cmd_recv_stream_2_11\": expected >= %zu bytes, got %zu bytes",
 169                                 header_len, payload->size);
 170                 ret = -1;
 171                 goto error;
 172         }
 173         memcpy(&header, payload->data, header_len);
 174
 175         header.channel_name_len = be32toh(header.channel_name_len);
 176         header.pathname_len = be32toh(header.pathname_len);
 177         header.tracefile_size = be64toh(header.tracefile_size);
 178         header.tracefile_count = be64toh(header.tracefile_count);
 179         header.trace_chunk_id = be64toh(header.trace_chunk_id);
 180
 181         received_names_size = header.channel_name_len + header.pathname_len;
 182         if (payload->size < header_len + received_names_size) {
 183                 ERR("Unexpected payload size in \"cmd_recv_stream_2_11\": expected >= %zu bytes, got %zu bytes",
 184                                 header_len + received_names_size, payload->size);
 185                 ret = -1;
 186                 goto error;
 187         }
 188
 189         /* Validate length against defined constant. */
 190         if (header.channel_name_len > DEFAULT_STREAM_NAME_LEN) {
 191                 ret = -ENAMETOOLONG;
 192                 ERR("Channel name too long");
 193                 goto error;
 194         }
 195         if (header.pathname_len > LTTNG_NAME_MAX) {
 196                 ret = -ENAMETOOLONG;
 197                 ERR("Pathname too long");
 198                 goto error;
 199         }
 200
 201         /* Validate that names are (NULL terminated. */
 202         channel_name_view = lttng_buffer_view_from_view(payload, header_len,
 203                             header.channel_name_len);
 204         pathname_view = lttng_buffer_view_from_view(payload,
 205                         header_len + header.channel_name_len, header.pathname_len);
 206
 207         if (channel_name_view.data[channel_name_view.size - 1] != '\0') {
 208                 ERR("cmd_recv_stream_2_11 channel_name is invalid (not NULL terminated)");
 209                 ret = -1;
 210                 goto error;
 211         }
 212
 213         if (pathname_view.data[pathname_view.size - 1] != '\0') {
 214                 ERR("cmd_recv_stream_2_11 patname is invalid (not NULL terminated)");
 215                 ret = -1;
 216                 goto error;
 217         }
 218
 219         channel_name = strdup(channel_name_view.data);
 220         if (!channel_name) {
 221                 ret = -errno;
 222                 PERROR("Channel name allocation");
 223                 goto error;
 224         }
 225
 226         path_name = strdup(pathname_view.data);
 227         if (!path_name) {
 228                 PERROR("Path name allocation");
 229                 ret = -ENOMEM;
 230                 goto error;
 231         }
 232
 233         *tracefile_size = header.tracefile_size;
 234         *tracefile_count = header.tracefile_count;
 235         *trace_archive_id = header.trace_chunk_id;
 236         *ret_path_name = path_name;
 237         *ret_channel_name = channel_name;
 238         /* Move ownership to caller */
 239         path_name = NULL;
 240         channel_name = NULL;
 241         ret = 0;
 242 error:
 243         free(channel_name);
 244         free(path_name);
 245         return ret;
 246 }