| 1 | /* |
| 2 | * Copyright (C) 2021 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: LGPL-2.1-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <lttng/action/path-internal.hpp> |
| 9 | |
| 10 | namespace { |
| 11 | struct lttng_action_path_comm { |
| 12 | uint32_t index_count; |
| 13 | uint64_t indexes[]; |
| 14 | } LTTNG_PACKED; |
| 15 | } /* namespace */ |
| 16 | |
| 17 | struct lttng_action_path *lttng_action_path_create(const uint64_t *indexes, size_t index_count) |
| 18 | { |
| 19 | int ret; |
| 20 | size_t i; |
| 21 | struct lttng_action_path *path = nullptr; |
| 22 | |
| 23 | if (!indexes && index_count > 0) { |
| 24 | goto error; |
| 25 | } |
| 26 | |
| 27 | path = zmalloc<lttng_action_path>(); |
| 28 | if (!path) { |
| 29 | goto error; |
| 30 | } |
| 31 | |
| 32 | lttng_dynamic_array_init(&path->indexes, sizeof(uint64_t), nullptr); |
| 33 | |
| 34 | for (i = 0; i < index_count; i++) { |
| 35 | ret = lttng_dynamic_array_add_element(&path->indexes, &indexes[i]); |
| 36 | if (ret) { |
| 37 | goto error; |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | goto end; |
| 42 | error: |
| 43 | lttng_action_path_destroy(path); |
| 44 | path = nullptr; |
| 45 | end: |
| 46 | return path; |
| 47 | } |
| 48 | |
| 49 | enum lttng_action_path_status |
| 50 | lttng_action_path_get_index_count(const struct lttng_action_path *path, size_t *index_count) |
| 51 | { |
| 52 | enum lttng_action_path_status status; |
| 53 | |
| 54 | if (!path || !index_count) { |
| 55 | status = LTTNG_ACTION_PATH_STATUS_INVALID; |
| 56 | goto end; |
| 57 | } |
| 58 | |
| 59 | *index_count = lttng_dynamic_array_get_count(&path->indexes); |
| 60 | status = LTTNG_ACTION_PATH_STATUS_OK; |
| 61 | end: |
| 62 | return status; |
| 63 | } |
| 64 | |
| 65 | enum lttng_action_path_status lttng_action_path_get_index_at_index( |
| 66 | const struct lttng_action_path *path, size_t path_index, uint64_t *out_index) |
| 67 | { |
| 68 | enum lttng_action_path_status status; |
| 69 | |
| 70 | if (!path || !out_index || path_index >= lttng_dynamic_array_get_count(&path->indexes)) { |
| 71 | status = LTTNG_ACTION_PATH_STATUS_INVALID; |
| 72 | goto end; |
| 73 | } |
| 74 | |
| 75 | *out_index = |
| 76 | *((typeof(out_index)) lttng_dynamic_array_get_element(&path->indexes, path_index)); |
| 77 | status = LTTNG_ACTION_PATH_STATUS_OK; |
| 78 | end: |
| 79 | return status; |
| 80 | } |
| 81 | |
| 82 | void lttng_action_path_destroy(struct lttng_action_path *action_path) |
| 83 | { |
| 84 | if (!action_path) { |
| 85 | goto end; |
| 86 | } |
| 87 | |
| 88 | lttng_dynamic_array_reset(&action_path->indexes); |
| 89 | free(action_path); |
| 90 | end: |
| 91 | return; |
| 92 | } |
| 93 | |
| 94 | int lttng_action_path_copy(const struct lttng_action_path *src, struct lttng_action_path **dst) |
| 95 | { |
| 96 | int ret; |
| 97 | struct lttng_action_path *new_path; |
| 98 | |
| 99 | LTTNG_ASSERT(src); |
| 100 | LTTNG_ASSERT(dst); |
| 101 | |
| 102 | new_path = lttng_action_path_create( |
| 103 | (uint64_t *) lttng_dynamic_array_get_element(&src->indexes, 0), |
| 104 | lttng_dynamic_array_get_count(&src->indexes)); |
| 105 | if (!new_path) { |
| 106 | ret = -1; |
| 107 | } else { |
| 108 | ret = 0; |
| 109 | *dst = new_path; |
| 110 | } |
| 111 | |
| 112 | return ret; |
| 113 | } |
| 114 | |
| 115 | ssize_t lttng_action_path_create_from_payload(struct lttng_payload_view *view, |
| 116 | struct lttng_action_path **_action_path) |
| 117 | { |
| 118 | ssize_t consumed_size = 0, ret = -1; |
| 119 | const struct lttng_action_path_comm *header; |
| 120 | struct lttng_action_path *action_path = nullptr; |
| 121 | const struct lttng_payload_view header_view = |
| 122 | lttng_payload_view_from_view(view, 0, sizeof(*header)); |
| 123 | |
| 124 | if (!lttng_payload_view_is_valid(&header_view)) { |
| 125 | goto end; |
| 126 | } |
| 127 | |
| 128 | header = (typeof(header)) header_view.buffer.data; |
| 129 | consumed_size += header_view.buffer.size; |
| 130 | |
| 131 | /* |
| 132 | * An action path of size 0 can exist and represents a trigger with a |
| 133 | * single non-list action. Handle it differently since a payload view of |
| 134 | * size 0 is considered invalid. |
| 135 | */ |
| 136 | if (header->index_count != 0) { |
| 137 | const struct lttng_payload_view indexes_view = lttng_payload_view_from_view( |
| 138 | view, consumed_size, header->index_count * sizeof(uint64_t)); |
| 139 | |
| 140 | if (!lttng_payload_view_is_valid(&indexes_view)) { |
| 141 | goto end; |
| 142 | } |
| 143 | |
| 144 | consumed_size += indexes_view.buffer.size; |
| 145 | action_path = lttng_action_path_create((const uint64_t *) indexes_view.buffer.data, |
| 146 | header->index_count); |
| 147 | if (!action_path) { |
| 148 | goto end; |
| 149 | } |
| 150 | } else { |
| 151 | action_path = lttng_action_path_create(nullptr, 0); |
| 152 | if (!action_path) { |
| 153 | goto end; |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | ret = consumed_size; |
| 158 | *_action_path = action_path; |
| 159 | end: |
| 160 | return ret; |
| 161 | } |
| 162 | |
| 163 | int lttng_action_path_serialize(const struct lttng_action_path *action_path, |
| 164 | struct lttng_payload *payload) |
| 165 | { |
| 166 | int ret; |
| 167 | size_t index_count, i; |
| 168 | enum lttng_action_path_status status; |
| 169 | lttng_action_path_comm comm; |
| 170 | |
| 171 | status = lttng_action_path_get_index_count(action_path, &index_count); |
| 172 | if (status != LTTNG_ACTION_PATH_STATUS_OK) { |
| 173 | ret = -1; |
| 174 | goto end; |
| 175 | } |
| 176 | |
| 177 | comm.index_count = (uint32_t) index_count; |
| 178 | ret = lttng_dynamic_buffer_append( |
| 179 | &payload->buffer, &comm, sizeof(struct lttng_action_path_comm)); |
| 180 | |
| 181 | for (i = 0; i < index_count; i++) { |
| 182 | uint64_t path_index; |
| 183 | |
| 184 | status = lttng_action_path_get_index_at_index(action_path, i, &path_index); |
| 185 | if (status != LTTNG_ACTION_PATH_STATUS_OK) { |
| 186 | ret = -1; |
| 187 | goto end; |
| 188 | } |
| 189 | |
| 190 | ret = lttng_dynamic_buffer_append( |
| 191 | &payload->buffer, &path_index, sizeof(path_index)); |
| 192 | if (ret) { |
| 193 | goto end; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | ret = 0; |
| 198 | end: |
| 199 | return ret; |
| 200 | } |