+#include "health-sessiond.h"
+#include "ust-app.h"
+#include "utils.h"
+#include "lttng-sessiond.h"
+
+/*
+ * Return allocated full pathname of the session using the consumer trace path
+ * and subdir if available.
+ *
+ * The caller can safely free(3) the returned value. On error, NULL is
+ * returned.
+ */
+char *setup_channel_trace_path(struct consumer_output *consumer,
+ const char *session_path, size_t *consumer_path_offset)
+{
+ int ret;
+ char *pathname;
+
+ assert(consumer);
+ assert(session_path);
+
+ health_code_update();
+
+ /*
+ * Allocate the string ourself to make sure we never exceed
+ * LTTNG_PATH_MAX.
+ */
+ pathname = zmalloc(LTTNG_PATH_MAX);
+ if (!pathname) {
+ goto error;
+ }
+
+ /* Get correct path name destination */
+ if (consumer->type == CONSUMER_DST_NET &&
+ consumer->relay_major_version == 2 &&
+ consumer->relay_minor_version < 11) {
+ ret = snprintf(pathname, LTTNG_PATH_MAX, "%s%s/%s/%s",
+ consumer->dst.net.base_dir,
+ consumer->chunk_path, consumer->domain_subdir,
+ session_path);
+ *consumer_path_offset = 0;
+ } else {
+ ret = snprintf(pathname, LTTNG_PATH_MAX, "%s/%s",
+ consumer->domain_subdir, session_path);
+ *consumer_path_offset = strlen(consumer->domain_subdir) + 1;
+ }
+ DBG3("Consumer trace path relative to current trace chunk: \"%s\"",
+ pathname);
+ if (ret < 0) {
+ PERROR("Failed to format channel path");
+ goto error;
+ } else if (ret >= LTTNG_PATH_MAX) {
+ ERR("Truncation occurred while formatting channel path");
+ goto error;
+ }
+
+ return pathname;
+error:
+ free(pathname);
+ return NULL;
+}
+
+/*
+ * Send a data payload using a given consumer socket of size len.
+ *
+ * The consumer socket lock MUST be acquired before calling this since this
+ * function can change the fd value.
+ *
+ * Return 0 on success else a negative value on error.
+ */
+int consumer_socket_send(
+ struct consumer_socket *socket, const void *msg, size_t len)
+{
+ int fd;
+ ssize_t size;
+
+ assert(socket);
+ assert(socket->fd_ptr);
+ assert(msg);
+
+ /* Consumer socket is invalid. Stopping. */
+ fd = *socket->fd_ptr;
+ if (fd < 0) {
+ goto error;
+ }
+
+ size = lttcomm_send_unix_sock(fd, msg, len);
+ if (size < 0) {
+ /* The above call will print a PERROR on error. */
+ DBG("Error when sending data to consumer on sock %d", fd);
+ /*
+ * At this point, the socket is not usable anymore thus closing it and
+ * setting the file descriptor to -1 so it is not reused.
+ */
+
+ /* This call will PERROR on error. */
+ (void) lttcomm_close_unix_sock(fd);
+ *socket->fd_ptr = -1;
+ goto error;
+ }
+
+ return 0;
+
+error:
+ return -1;
+}
+
+/*
+ * Receive a data payload using a given consumer socket of size len.
+ *
+ * The consumer socket lock MUST be acquired before calling this since this
+ * function can change the fd value.
+ *
+ * Return 0 on success else a negative value on error.
+ */
+int consumer_socket_recv(struct consumer_socket *socket, void *msg, size_t len)
+{
+ int fd;
+ ssize_t size;
+
+ assert(socket);
+ assert(socket->fd_ptr);
+ assert(msg);
+
+ /* Consumer socket is invalid. Stopping. */
+ fd = *socket->fd_ptr;
+ if (fd < 0) {
+ goto error;
+ }
+
+ size = lttcomm_recv_unix_sock(fd, msg, len);
+ if (size <= 0) {
+ /* The above call will print a PERROR on error. */
+ DBG("Error when receiving data from the consumer socket %d", fd);
+ /*
+ * At this point, the socket is not usable anymore thus closing it and
+ * setting the file descriptor to -1 so it is not reused.
+ */
+
+ /* This call will PERROR on error. */
+ (void) lttcomm_close_unix_sock(fd);
+ *socket->fd_ptr = -1;
+ goto error;
+ }
+
+ return 0;
+
+error:
+ return -1;
+}
+
+/*
+ * Receive a reply command status message from the consumer. Consumer socket
+ * lock MUST be acquired before calling this function.
+ *
+ * Return 0 on success, -1 on recv error or a negative lttng error code which
+ * was possibly returned by the consumer.
+ */
+int consumer_recv_status_reply(struct consumer_socket *sock)
+{
+ int ret;
+ struct lttcomm_consumer_status_msg reply;
+
+ assert(sock);
+
+ ret = consumer_socket_recv(sock, &reply, sizeof(reply));
+ if (ret < 0) {
+ goto end;
+ }
+
+ if (reply.ret_code == LTTCOMM_CONSUMERD_SUCCESS) {
+ /* All good. */
+ ret = 0;
+ } else {
+ ret = -reply.ret_code;
+ DBG("Consumer ret code %d", ret);
+ }
+
+end:
+ return ret;
+}
+
+/*
+ * Once the ASK_CHANNEL command is sent to the consumer, the channel
+ * information are sent back. This call receives that data and populates key
+ * and stream_count.
+ *
+ * On success return 0 and both key and stream_count are set. On error, a
+ * negative value is sent back and both parameters are untouched.
+ */
+int consumer_recv_status_channel(struct consumer_socket *sock,
+ uint64_t *key, unsigned int *stream_count)
+{
+ int ret;
+ struct lttcomm_consumer_status_channel reply;
+
+ assert(sock);
+ assert(stream_count);
+ assert(key);
+
+ ret = consumer_socket_recv(sock, &reply, sizeof(reply));
+ if (ret < 0) {
+ goto end;
+ }
+
+ /* An error is possible so don't touch the key and stream_count. */
+ if (reply.ret_code != LTTCOMM_CONSUMERD_SUCCESS) {
+ ret = -1;
+ goto end;
+ }
+
+ *key = reply.key;
+ *stream_count = reply.stream_count;
+ ret = 0;
+
+end:
+ return ret;
+}
+
+/*
+ * Send destroy relayd command to consumer.
+ *
+ * On success return positive value. On error, negative value.
+ */
+int consumer_send_destroy_relayd(struct consumer_socket *sock,
+ struct consumer_output *consumer)
+{
+ int ret;
+ struct lttcomm_consumer_msg msg;
+
+ assert(consumer);
+ assert(sock);
+
+ DBG2("Sending destroy relayd command to consumer sock %d", *sock->fd_ptr);
+
+ memset(&msg, 0, sizeof(msg));
+ msg.cmd_type = LTTNG_CONSUMER_DESTROY_RELAYD;
+ msg.u.destroy_relayd.net_seq_idx = consumer->net_seq_index;
+
+ pthread_mutex_lock(sock->lock);
+ ret = consumer_socket_send(sock, &msg, sizeof(msg));
+ if (ret < 0) {
+ goto error;
+ }
+
+ /* Don't check the return value. The caller will do it. */
+ ret = consumer_recv_status_reply(sock);
+
+ DBG2("Consumer send destroy relayd command done");
+
+error:
+ pthread_mutex_unlock(sock->lock);
+ return ret;
+}
+
+/*
+ * For each consumer socket in the consumer output object, send a destroy
+ * relayd command.
+ */
+void consumer_output_send_destroy_relayd(struct consumer_output *consumer)
+{
+ struct lttng_ht_iter iter;
+ struct consumer_socket *socket;
+
+ assert(consumer);
+
+ /* Destroy any relayd connection */
+ if (consumer->type == CONSUMER_DST_NET) {
+ rcu_read_lock();
+ cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
+ node.node) {
+ int ret;
+
+ /* Send destroy relayd command */
+ ret = consumer_send_destroy_relayd(socket, consumer);
+ if (ret < 0) {
+ DBG("Unable to send destroy relayd command to consumer");
+ /* Continue since we MUST delete everything at this point. */
+ }
+ }
+ rcu_read_unlock();
+ }
+}
+
+/*
+ * From a consumer_data structure, allocate and add a consumer socket to the
+ * consumer output.
+ *
+ * Return 0 on success, else negative value on error
+ */
+int consumer_create_socket(struct consumer_data *data,
+ struct consumer_output *output)
+{
+ int ret = 0;
+ struct consumer_socket *socket;
+
+ assert(data);
+
+ if (output == NULL || data->cmd_sock < 0) {
+ /*
+ * Not an error. Possible there is simply not spawned consumer or it's
+ * disabled for the tracing session asking the socket.
+ */
+ goto error;
+ }
+
+ rcu_read_lock();
+ socket = consumer_find_socket(data->cmd_sock, output);
+ rcu_read_unlock();
+ if (socket == NULL) {
+ socket = consumer_allocate_socket(&data->cmd_sock);
+ if (socket == NULL) {
+ ret = -1;
+ goto error;
+ }
+
+ socket->registered = 0;
+ socket->lock = &data->lock;
+ rcu_read_lock();
+ consumer_add_socket(socket, output);
+ rcu_read_unlock();
+ }
+
+ socket->type = data->type;
+
+ DBG3("Consumer socket created (fd: %d) and added to output",
+ data->cmd_sock);
+
+error:
+ return ret;
+}
+
+/*
+ * Return the consumer socket from the given consumer output with the right
+ * bitness. On error, returns NULL.
+ *
+ * The caller MUST acquire a rcu read side lock and keep it until the socket
+ * object reference is not needed anymore.
+ */
+struct consumer_socket *consumer_find_socket_by_bitness(int bits,
+ const struct consumer_output *consumer)
+{
+ int consumer_fd;
+ struct consumer_socket *socket = NULL;
+
+ switch (bits) {
+ case 64:
+ consumer_fd = uatomic_read(&ust_consumerd64_fd);
+ break;
+ case 32:
+ consumer_fd = uatomic_read(&ust_consumerd32_fd);
+ break;
+ default:
+ assert(0);
+ goto end;
+ }
+
+ socket = consumer_find_socket(consumer_fd, consumer);
+ if (!socket) {
+ ERR("Consumer socket fd %d not found in consumer obj %p",
+ consumer_fd, consumer);
+ }
+
+end:
+ return socket;
+}