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

   1 /*
   2  * Copyright (C) 2018 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #define _LGPL_SOURCE
   9 #include <assert.h>
  10 #include <inttypes.h>
  11
  12 #include <common/common.h>
  13 #include <common/sessiond-comm/relayd.h>
  14
  15 #include <common/compat/endian.h>
  16 #include <common/compat/string.h>
  17 #include <lttng/constant.h>
  18
  19 #include "cmd-2-11.h"
  20 #include "utils.h"
  21
  22 int cmd_create_session_2_11(const struct lttng_buffer_view *payload,
  23                 char *session_name, char *hostname, char *base_path,
  24                 uint32_t *live_timer, bool *snapshot,
  25                 uint64_t *id_sessiond, lttng_uuid sessiond_uuid,
  26                 bool *has_current_chunk, uint64_t *current_chunk_id,
  27                 time_t *creation_time,
  28                 bool *session_name_contains_creation_time)
  29 {
  30         int ret;
  31         struct lttcomm_relayd_create_session_2_11 header;
  32         size_t header_len, received_names_size, offset;
  33         struct lttng_buffer_view session_name_view;
  34         struct lttng_buffer_view hostname_view;
  35         struct lttng_buffer_view base_path_view;
  36
  37         header_len = sizeof(header);
  38
  39         if (payload->size < header_len) {
  40                 ERR("Unexpected payload size in \"cmd_create_session_2_11\": expected >= %zu bytes, got %zu bytes",
  41                                 header_len, payload->size);
  42                 ret = -1;
  43                 goto error;
  44         }
  45         memcpy(&header, payload->data, header_len);
  46
  47         header.session_name_len = be32toh(header.session_name_len);
  48         header.hostname_len = be32toh(header.hostname_len);
  49         header.base_path_len = be32toh(header.base_path_len);
  50         header.live_timer = be32toh(header.live_timer);
  51         header.current_chunk_id.value = be64toh(header.current_chunk_id.value);
  52         header.current_chunk_id.is_set = !!header.current_chunk_id.is_set;
  53         header.creation_time = be64toh(header.creation_time);
  54         header.session_id = be64toh(header.session_id);
  55
  56         lttng_uuid_copy(sessiond_uuid, header.sessiond_uuid);
  57
  58         received_names_size = header.session_name_len + header.hostname_len +
  59                                 header.base_path_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         } else if (header.session_name_len == 0) {
  73                 ret = -EINVAL;
  74                 ERR("Illegal session name length of 0 received");
  75                 goto error;
  76         }
  77         if (header.hostname_len > LTTNG_HOST_NAME_MAX) {
  78                 ret = -ENAMETOOLONG;
  79                 ERR("Length of hostname (%" PRIu32 " bytes) received in create_session command exceeds maximum length (%d bytes)", header.hostname_len, LTTNG_HOST_NAME_MAX);
  80                 goto error;
  81         }
  82         if (header.base_path_len > LTTNG_PATH_MAX) {
  83                 ret = -ENAMETOOLONG;
  84                 ERR("Length of base_path (%" PRIu32 " bytes) received in create_session command exceeds maximum length (%d bytes)", header.base_path_len, PATH_MAX);
  85                 goto error;
  86         }
  87
  88         offset = header_len;
  89         session_name_view = lttng_buffer_view_from_view(payload, offset,
  90                         header.session_name_len);
  91         offset += header.session_name_len;
  92         hostname_view = lttng_buffer_view_from_view(payload,
  93                         offset, header.hostname_len);
  94         offset += header.hostname_len;
  95         base_path_view = lttng_buffer_view_from_view(payload,
  96                         offset, header.base_path_len);
  97
  98         /* Validate that names are NULL terminated. */
  99         if (session_name_view.data[session_name_view.size - 1] != '\0') {
 100                 ERR("cmd_create_session_2_11 session_name is invalid (not NULL terminated)");
 101                 ret = -1;
 102                 goto error;
 103         }
 104
 105         if (hostname_view.data[hostname_view.size - 1] != '\0') {
 106                 ERR("cmd_create_session_2_11 hostname is invalid (not NULL terminated)");
 107                 ret = -1;
 108                 goto error;
 109         }
 110
 111         if (base_path_view.size != 0 &&
 112                         base_path_view.data[base_path_view.size - 1] != '\0') {
 113                 ERR("cmd_create_session_2_11 base_path is invalid (not NULL terminated)");
 114                 ret = -1;
 115                 goto error;
 116         }
 117
 118         /*
 119          * Length and null-termination check are already performed.
 120          * LTTNG_NAME_MAX, LTTNG_HOST_NAME_MAX, and LTTNG_PATH_MAX max sizes are expected.
 121          */
 122         strcpy(session_name, session_name_view.data);
 123         strcpy(hostname, hostname_view.data);
 124         strcpy(base_path, base_path_view.size ? base_path_view.data : "");
 125
 126         *live_timer = header.live_timer;
 127         *snapshot = !!header.snapshot;
 128         *current_chunk_id = header.current_chunk_id.value;
 129         *has_current_chunk = header.current_chunk_id.is_set;
 130         *creation_time = (time_t) header.creation_time;
 131         *session_name_contains_creation_time =
 132                 header.session_name_contains_creation_time;
 133         *id_sessiond = header.session_id;
 134
 135         ret = 0;
 136
 137 error:
 138         return ret;
 139 }
 140
 141 /*
 142  * cmd_recv_stream_2_11 allocates path_name and channel_name.
 143  */
 144 int cmd_recv_stream_2_11(const struct lttng_buffer_view *payload,
 145                 char **ret_path_name, char **ret_channel_name,
 146                 uint64_t *tracefile_size, uint64_t *tracefile_count,
 147                 uint64_t *trace_archive_id)
 148 {
 149         int ret;
 150         struct lttcomm_relayd_add_stream_2_11 header;
 151         size_t header_len, received_names_size;
 152         struct lttng_buffer_view channel_name_view;
 153         struct lttng_buffer_view pathname_view;
 154         char *path_name = NULL;
 155         char *channel_name = NULL;
 156
 157         header_len = sizeof(header);
 158
 159         if (payload->size < header_len) {
 160                 ERR("Unexpected payload size in \"cmd_recv_stream_2_11\": expected >= %zu bytes, got %zu bytes",
 161                                 header_len, payload->size);
 162                 ret = -1;
 163                 goto error;
 164         }
 165         memcpy(&header, payload->data, header_len);
 166
 167         header.channel_name_len = be32toh(header.channel_name_len);
 168         header.pathname_len = be32toh(header.pathname_len);
 169         header.tracefile_size = be64toh(header.tracefile_size);
 170         header.tracefile_count = be64toh(header.tracefile_count);
 171         header.trace_chunk_id = be64toh(header.trace_chunk_id);
 172
 173         received_names_size = header.channel_name_len + header.pathname_len;
 174         if (payload->size < header_len + received_names_size) {
 175                 ERR("Unexpected payload size in \"cmd_recv_stream_2_11\": expected >= %zu bytes, got %zu bytes",
 176                                 header_len + received_names_size, payload->size);
 177                 ret = -1;
 178                 goto error;
 179         }
 180
 181         /* Validate length against defined constant. */
 182         if (header.channel_name_len > DEFAULT_STREAM_NAME_LEN) {
 183                 ret = -ENAMETOOLONG;
 184                 ERR("Channel name too long");
 185                 goto error;
 186         }
 187         if (header.pathname_len > LTTNG_NAME_MAX) {
 188                 ret = -ENAMETOOLONG;
 189                 ERR("Pathname too long");
 190                 goto error;
 191         }
 192
 193         /* Validate that names are (NULL terminated. */
 194         channel_name_view = lttng_buffer_view_from_view(payload, header_len,
 195                             header.channel_name_len);
 196         pathname_view = lttng_buffer_view_from_view(payload,
 197                         header_len + header.channel_name_len, header.pathname_len);
 198
 199         if (channel_name_view.data[channel_name_view.size - 1] != '\0') {
 200                 ERR("cmd_recv_stream_2_11 channel_name is invalid (not NULL terminated)");
 201                 ret = -1;
 202                 goto error;
 203         }
 204
 205         if (pathname_view.data[pathname_view.size - 1] != '\0') {
 206                 ERR("cmd_recv_stream_2_11 patname is invalid (not NULL terminated)");
 207                 ret = -1;
 208                 goto error;
 209         }
 210
 211         channel_name = strdup(channel_name_view.data);
 212         if (!channel_name) {
 213                 ret = -errno;
 214                 PERROR("Channel name allocation");
 215                 goto error;
 216         }
 217
 218         path_name = strdup(pathname_view.data);
 219         if (!path_name) {
 220                 PERROR("Path name allocation");
 221                 ret = -ENOMEM;
 222                 goto error;
 223         }
 224
 225         *tracefile_size = header.tracefile_size;
 226         *tracefile_count = header.tracefile_count;
 227         *trace_archive_id = header.trace_chunk_id;
 228         *ret_path_name = path_name;
 229         *ret_channel_name = channel_name;
 230         /* Move ownership to caller */
 231         path_name = NULL;
 232         channel_name = NULL;
 233         ret = 0;
 234 error:
 235         free(channel_name);
 236         free(path_name);
 237         return ret;
 238 }