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