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Diffstat (limited to 'fluent-bit/plugins/in_tcp/tcp_conn.c')
-rw-r--r--fluent-bit/plugins/in_tcp/tcp_conn.c412
1 files changed, 412 insertions, 0 deletions
diff --git a/fluent-bit/plugins/in_tcp/tcp_conn.c b/fluent-bit/plugins/in_tcp/tcp_conn.c
new file mode 100644
index 00000000..28b4b322
--- /dev/null
+++ b/fluent-bit/plugins/in_tcp/tcp_conn.c
@@ -0,0 +1,412 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+/* Fluent Bit
+ * ==========
+ * Copyright (C) 2015-2022 The Fluent Bit Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <fluent-bit/flb_input_plugin.h>
+#include <fluent-bit/flb_utils.h>
+#include <fluent-bit/flb_engine.h>
+#include <fluent-bit/flb_network.h>
+#include <fluent-bit/flb_pack.h>
+#include <fluent-bit/flb_error.h>
+
+#include "tcp.h"
+#include "tcp_conn.h"
+
+static inline void consume_bytes(char *buf, int bytes, int length)
+{
+ memmove(buf, buf + bytes, length - bytes);
+}
+
+static inline int process_pack(struct tcp_conn *conn,
+ char *pack, size_t size)
+{
+ int ret;
+ size_t off = 0;
+ msgpack_unpacked result;
+ msgpack_object entry;
+ struct flb_in_tcp_config *ctx;
+
+ ctx = conn->ctx;
+
+ flb_log_event_encoder_reset(ctx->log_encoder);
+
+ /* First pack the results, iterate concatenated messages */
+ msgpack_unpacked_init(&result);
+ while (msgpack_unpack_next(&result, pack, size, &off) == MSGPACK_UNPACK_SUCCESS) {
+ entry = result.data;
+
+ ret = flb_log_event_encoder_begin_record(ctx->log_encoder);
+
+ if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+ ret = flb_log_event_encoder_set_current_timestamp(ctx->log_encoder);
+ }
+
+ if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+ if (entry.type == MSGPACK_OBJECT_MAP) {
+ ret = flb_log_event_encoder_set_body_from_msgpack_object(
+ ctx->log_encoder, &entry);
+ }
+ else if (entry.type == MSGPACK_OBJECT_ARRAY) {
+ ret = flb_log_event_encoder_append_body_values(
+ ctx->log_encoder,
+ FLB_LOG_EVENT_CSTRING_VALUE("msg"),
+ FLB_LOG_EVENT_MSGPACK_OBJECT_VALUE(&entry));
+ }
+ else {
+ ret = FLB_EVENT_ENCODER_ERROR_INVALID_VALUE_TYPE;
+ }
+
+ if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+ ret = flb_log_event_encoder_commit_record(ctx->log_encoder);
+ }
+
+ if (ret != FLB_EVENT_ENCODER_SUCCESS) {
+ break;
+ }
+ }
+ }
+
+ msgpack_unpacked_destroy(&result);
+
+ if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+ flb_input_log_append(conn->ins, NULL, 0,
+ ctx->log_encoder->output_buffer,
+ ctx->log_encoder->output_length);
+ ret = 0;
+ }
+ else {
+ flb_plg_error(ctx->ins, "log event encoding error : %d", ret);
+
+ ret = -1;
+ }
+
+ return ret;
+}
+
+/* Process a JSON payload, return the number of processed bytes */
+static ssize_t parse_payload_json(struct tcp_conn *conn)
+{
+ int ret;
+ int out_size;
+ char *pack;
+
+ ret = flb_pack_json_state(conn->buf_data, conn->buf_len,
+ &pack, &out_size, &conn->pack_state);
+ if (ret == FLB_ERR_JSON_PART) {
+ flb_plg_debug(conn->ins, "JSON incomplete, waiting for more data...");
+ return 0;
+ }
+ else if (ret == FLB_ERR_JSON_INVAL) {
+ flb_plg_warn(conn->ins, "invalid JSON message, skipping");
+ conn->buf_len = 0;
+ conn->pack_state.multiple = FLB_TRUE;
+ return -1;
+ }
+ else if (ret == -1) {
+ return -1;
+ }
+
+ /* Process the packaged JSON and return the last byte used */
+ process_pack(conn, pack, out_size);
+ flb_free(pack);
+
+ return conn->pack_state.last_byte;
+}
+
+/*
+ * Process a raw text payload, uses the delimited character to split records,
+ * return the number of processed bytes
+ */
+static ssize_t parse_payload_none(struct tcp_conn *conn)
+{
+ int ret;
+ int len;
+ int sep_len;
+ size_t consumed = 0;
+ char *buf;
+ char *s;
+ char *separator;
+ struct flb_in_tcp_config *ctx;
+
+ ctx = conn->ctx;
+
+ separator = conn->ctx->separator;
+ sep_len = flb_sds_len(conn->ctx->separator);
+
+ buf = conn->buf_data;
+ ret = FLB_EVENT_ENCODER_SUCCESS;
+
+ flb_log_event_encoder_reset(ctx->log_encoder);
+
+ while ((s = strstr(buf, separator))) {
+ len = (s - buf);
+ if (len == 0) {
+ break;
+ }
+ else if (len > 0) {
+ ret = flb_log_event_encoder_begin_record(ctx->log_encoder);
+
+ if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+ ret = flb_log_event_encoder_set_current_timestamp(ctx->log_encoder);
+ }
+
+ if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+ ret = flb_log_event_encoder_append_body_values(
+ ctx->log_encoder,
+ FLB_LOG_EVENT_CSTRING_VALUE("log"),
+ FLB_LOG_EVENT_STRING_VALUE(buf, len));
+ }
+
+ if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+ ret = flb_log_event_encoder_commit_record(ctx->log_encoder);
+ }
+
+ if (ret != FLB_EVENT_ENCODER_SUCCESS) {
+ break;
+ }
+
+ consumed += len + 1;
+ buf += len + sep_len;
+ }
+ else {
+ break;
+ }
+ }
+
+ if (ret == FLB_EVENT_ENCODER_SUCCESS) {
+ flb_input_log_append(conn->ins, NULL, 0,
+ ctx->log_encoder->output_buffer,
+ ctx->log_encoder->output_length);
+ }
+ else {
+ flb_plg_error(ctx->ins, "log event encoding error : %d", ret);
+ }
+
+ return consumed;
+}
+
+/* Callback invoked every time an event is triggered for a connection */
+int tcp_conn_event(void *data)
+{
+ int bytes;
+ int available;
+ int size;
+ ssize_t ret_payload = -1;
+ char *tmp;
+ struct mk_event *event;
+ struct tcp_conn *conn;
+ struct flb_connection *connection;
+ struct flb_in_tcp_config *ctx;
+
+ connection = (struct flb_connection *) data;
+
+ conn = connection->user_data;
+
+ ctx = conn->ctx;
+
+ event = &connection->event;
+
+ if (event->mask & MK_EVENT_READ) {
+ available = (conn->buf_size - conn->buf_len) - 1;
+ if (available < 1) {
+ if (conn->buf_size + ctx->chunk_size > ctx->buffer_size) {
+ flb_plg_warn(ctx->ins,
+ "fd=%i incoming data exceeds 'Buffer_Size' (%zu KB)",
+ event->fd, (ctx->buffer_size / 1024));
+ tcp_conn_del(conn);
+ return -1;
+ }
+
+ size = conn->buf_size + ctx->chunk_size;
+ tmp = flb_realloc(conn->buf_data, size);
+ if (!tmp) {
+ flb_errno();
+ return -1;
+ }
+ flb_plg_trace(ctx->ins, "fd=%i buffer realloc %i -> %i",
+ event->fd, conn->buf_size, size);
+
+ conn->buf_data = tmp;
+ conn->buf_size = size;
+ available = (conn->buf_size - conn->buf_len) - 1;
+ }
+
+ /* Read data */
+ bytes = flb_io_net_read(connection,
+ (void *) &conn->buf_data[conn->buf_len],
+ available);
+
+ if (bytes <= 0) {
+ flb_plg_trace(ctx->ins, "fd=%i closed connection", event->fd);
+ tcp_conn_del(conn);
+ return -1;
+ }
+
+ flb_plg_trace(ctx->ins, "read()=%i pre_len=%i now_len=%i",
+ bytes, conn->buf_len, conn->buf_len + bytes);
+ conn->buf_len += bytes;
+ conn->buf_data[conn->buf_len] = '\0';
+
+ /* Strip CR or LF if found at first byte */
+ if (conn->buf_data[0] == '\r' || conn->buf_data[0] == '\n') {
+ /* Skip message with one byte with CR or LF */
+ flb_plg_trace(ctx->ins, "skip one byte message with ASCII code=%i",
+ conn->buf_data[0]);
+ consume_bytes(conn->buf_data, 1, conn->buf_len);
+ conn->buf_len--;
+ conn->buf_data[conn->buf_len] = '\0';
+ }
+
+ /* JSON Format handler */
+ if (ctx->format == FLB_TCP_FMT_JSON) {
+ ret_payload = parse_payload_json(conn);
+ if (ret_payload == 0) {
+ /* Incomplete JSON message, we need more data */
+ return -1;
+ }
+ else if (ret_payload == -1) {
+ flb_pack_state_reset(&conn->pack_state);
+ flb_pack_state_init(&conn->pack_state);
+ conn->pack_state.multiple = FLB_TRUE;
+ return -1;
+ }
+ }
+ else if (ctx->format == FLB_TCP_FMT_NONE) {
+ ret_payload = parse_payload_none(conn);
+ if (ret_payload == 0) {
+ return -1;
+ }
+ else if (ret_payload == -1) {
+ conn->buf_len = 0;
+ return -1;
+ }
+ }
+
+
+ consume_bytes(conn->buf_data, ret_payload, conn->buf_len);
+ conn->buf_len -= ret_payload;
+ conn->buf_data[conn->buf_len] = '\0';
+
+ if (ctx->format == FLB_TCP_FMT_JSON) {
+ jsmn_init(&conn->pack_state.parser);
+ conn->pack_state.tokens_count = 0;
+ conn->pack_state.last_byte = 0;
+ conn->pack_state.buf_len = 0;
+ }
+
+ return bytes;
+ }
+
+ if (event->mask & MK_EVENT_CLOSE) {
+ flb_plg_trace(ctx->ins, "fd=%i hangup", event->fd);
+ tcp_conn_del(conn);
+ return -1;
+ }
+
+ return 0;
+}
+
+/* Create a new mqtt request instance */
+struct tcp_conn *tcp_conn_add(struct flb_connection *connection,
+ struct flb_in_tcp_config *ctx)
+{
+ struct tcp_conn *conn;
+ int ret;
+
+ conn = flb_malloc(sizeof(struct tcp_conn));
+ if (!conn) {
+ flb_errno();
+ return NULL;
+ }
+
+ conn->connection = connection;
+
+ /* Set data for the event-loop */
+ MK_EVENT_NEW(&connection->event);
+
+ connection->user_data = conn;
+ connection->event.type = FLB_ENGINE_EV_CUSTOM;
+ connection->event.handler = tcp_conn_event;
+
+ /* Connection info */
+ conn->ctx = ctx;
+ conn->buf_len = 0;
+ conn->rest = 0;
+ conn->status = TCP_NEW;
+
+ conn->buf_data = flb_malloc(ctx->chunk_size);
+ if (!conn->buf_data) {
+ flb_errno();
+
+ flb_plg_error(ctx->ins, "could not allocate new connection");
+ flb_free(conn);
+
+ return NULL;
+ }
+ conn->buf_size = ctx->chunk_size;
+ conn->ins = ctx->ins;
+
+ /* Initialize JSON parser */
+ if (ctx->format == FLB_TCP_FMT_JSON) {
+ flb_pack_state_init(&conn->pack_state);
+ conn->pack_state.multiple = FLB_TRUE;
+ }
+
+ /* Register instance into the event loop */
+ ret = mk_event_add(flb_engine_evl_get(),
+ connection->fd,
+ FLB_ENGINE_EV_CUSTOM,
+ MK_EVENT_READ,
+ &connection->event);
+ if (ret == -1) {
+ flb_plg_error(ctx->ins, "could not register new connection");
+
+ flb_free(conn->buf_data);
+ flb_free(conn);
+
+ return NULL;
+ }
+
+ mk_list_add(&conn->_head, &ctx->connections);
+
+ return conn;
+}
+
+int tcp_conn_del(struct tcp_conn *conn)
+{
+ struct flb_in_tcp_config *ctx;
+
+ ctx = conn->ctx;
+
+ if (ctx->format == FLB_TCP_FMT_JSON) {
+ flb_pack_state_reset(&conn->pack_state);
+ }
+
+ /* The downstream unregisters the file descriptor from the event-loop
+ * so there's nothing to be done by the plugin
+ */
+ flb_downstream_conn_release(conn->connection);
+
+ /* Release resources */
+ mk_list_del(&conn->_head);
+
+ flb_free(conn->buf_data);
+ flb_free(conn);
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-18 06:08:41 +0000