src/bin/lttng-relayd/cmd-2-15.cpp

   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 <inttypes.h>
  10
  11 #include <common/common.hpp>
  12 #include <common/sessiond-comm/relayd.hpp>
  13
  14 #include <common/compat/endian.hpp>
  15 #include <common/compat/string.hpp>
  16 #include <lttng/constant.h>
  17
  18 #include "cmd-2-15.hpp"
  19 #include "utils.hpp"
  20
  21 int cmd_create_session_2_15(const struct lttng_buffer_view *payload,
  22                 char *session_name,
  23                 char *hostname,
  24                 char *base_path,
  25                 uint32_t *live_timer,
  26                 bool *snapshot,
  27                 uint64_t *id_sessiond,
  28                 lttng_uuid& sessiond_uuid,
  29                 bool *has_current_chunk,
  30                 uint64_t *current_chunk_id,
  31                 time_t *creation_time,
  32                 bool *session_name_contains_creation_time,
  33                 relayd_trace_format& trace_format)
  34 {
  35         int ret;
  36         struct lttcomm_relayd_create_session_2_15 header;
  37         size_t header_len, received_names_size, offset;
  38         struct lttng_buffer_view session_name_view;
  39         struct lttng_buffer_view hostname_view;
  40         struct lttng_buffer_view base_path_view;
  41
  42         header_len = sizeof(header);
  43
  44         if (payload->size < header_len) {
  45                 ERR("Unexpected payload size in \"cmd_create_session_2_15\": expected >= %zu bytes, got %zu bytes",
  46                                 header_len, payload->size);
  47                 ret = -1;
  48                 goto error;
  49         }
  50         memcpy(&header, payload->data, header_len);
  51
  52         header.session_name_len = be32toh(header.session_name_len);
  53         header.hostname_len = be32toh(header.hostname_len);
  54         header.base_path_len = be32toh(header.base_path_len);
  55         header.live_timer = be32toh(header.live_timer);
  56         header.current_chunk_id.value = be64toh(header.current_chunk_id.value);
  57         header.current_chunk_id.is_set = !!header.current_chunk_id.is_set;
  58         header.creation_time = be64toh(header.creation_time);
  59         header.session_id = be64toh(header.session_id);
  60
  61         std::copy(std::begin(header.sessiond_uuid), std::end(header.sessiond_uuid),
  62                         sessiond_uuid.begin());
  63
  64         received_names_size = header.session_name_len + header.hostname_len + header.base_path_len;
  65         if (payload->size < header_len + received_names_size) {
  66                 ERR("Unexpected payload size in \"cmd_create_session_2_15\": expected >= %zu bytes, got %zu bytes",
  67                                 header_len + received_names_size, payload->size);
  68                 ret = -1;
  69                 goto error;
  70         }
  71
  72         /* Validate length against defined constant. */
  73         if (header.session_name_len > LTTNG_NAME_MAX) {
  74                 ret = -ENAMETOOLONG;
  75                 ERR("Length of session name (%" PRIu32
  76                     " bytes) received in create_session command exceeds maximum length (%d bytes)",
  77                                 header.session_name_len, LTTNG_NAME_MAX);
  78                 goto error;
  79         } else if (header.session_name_len == 0) {
  80                 ret = -EINVAL;
  81                 ERR("Illegal session name length of 0 received");
  82                 goto error;
  83         }
  84         if (header.hostname_len > LTTNG_HOST_NAME_MAX) {
  85                 ret = -ENAMETOOLONG;
  86                 ERR("Length of hostname (%" PRIu32
  87                     " bytes) received in create_session command exceeds maximum length (%d bytes)",
  88                                 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
  94                     " bytes) received in create_session command exceeds maximum length (%d bytes)",
  95                                 header.base_path_len, PATH_MAX);
  96                 goto error;
  97         }
  98
  99         offset = header_len;
 100         session_name_view = lttng_buffer_view_from_view(payload, offset, header.session_name_len);
 101         if (!lttng_buffer_view_is_valid(&session_name_view)) {
 102                 ERR("Invalid payload in \"cmd_create_session_2_15\": buffer too short to contain session name");
 103                 ret = -1;
 104                 goto error;
 105         }
 106
 107         offset += header.session_name_len;
 108         hostname_view = lttng_buffer_view_from_view(payload, offset, header.hostname_len);
 109         if (!lttng_buffer_view_is_valid(&hostname_view)) {
 110                 ERR("Invalid payload in \"cmd_create_session_2_15\": buffer too short to contain hostname");
 111                 ret = -1;
 112                 goto error;
 113         }
 114
 115         offset += header.hostname_len;
 116         base_path_view = lttng_buffer_view_from_view(payload, offset, header.base_path_len);
 117         if (header.base_path_len > 0 && !lttng_buffer_view_is_valid(&base_path_view)) {
 118                 ERR("Invalid payload in \"cmd_create_session_2_15\": buffer too short to contain base path");
 119                 ret = -1;
 120                 goto error;
 121         }
 122
 123         /* Validate that names are NULL terminated. */
 124         if (session_name_view.data[session_name_view.size - 1] != '\0') {
 125                 ERR("cmd_create_session_2_15 session_name is invalid (not NULL terminated)");
 126                 ret = -1;
 127                 goto error;
 128         }
 129
 130         if (hostname_view.data[hostname_view.size - 1] != '\0') {
 131                 ERR("cmd_create_session_2_15 hostname is invalid (not NULL terminated)");
 132                 ret = -1;
 133                 goto error;
 134         }
 135
 136         if (base_path_view.size != 0 && base_path_view.data[base_path_view.size - 1] != '\0') {
 137                 ERR("cmd_create_session_2_15 base_path is invalid (not NULL terminated)");
 138                 ret = -1;
 139                 goto error;
 140         }
 141
 142         /*
 143          * Length and null-termination check are already performed.
 144          * LTTNG_NAME_MAX, LTTNG_HOST_NAME_MAX, and LTTNG_PATH_MAX max sizes are
 145          * expected.
 146          */
 147         strcpy(session_name, session_name_view.data);
 148         strcpy(hostname, hostname_view.data);
 149         strcpy(base_path, base_path_view.size ? base_path_view.data : "");
 150
 151         *live_timer = header.live_timer;
 152         *snapshot = !!header.snapshot;
 153         *current_chunk_id = header.current_chunk_id.value;
 154         *has_current_chunk = header.current_chunk_id.is_set;
 155         *creation_time = (time_t) header.creation_time;
 156         *session_name_contains_creation_time = header.session_name_contains_creation_time;
 157         *id_sessiond = header.session_id;
 158         trace_format = static_cast<enum relayd_trace_format>(header.trace_format);
 159
 160         ret = 0;
 161
 162 error:
 163         return ret;
 164 }