--- /dev/null
+/*
+ * Copyright (C) 2014 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License, version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#define _GNU_SOURCE
+#include <assert.h>
+#include <inttypes.h>
+#include <string.h>
+#include <urcu/uatomic.h>
+#include <unistd.h>
+
+#include <common/defaults.h>
+#include <common/error.h>
+#include <common/config/config.h>
+#include <common/config/config-session-internal.h>
+#include <common/utils.h>
+#include <common/runas.h>
+#include <lttng/save-internal.h>
+
+#include "save.h"
+#include "session.h"
+#include "trace-ust.h"
+
+static
+int save_kernel_channel_attributes(struct config_writer *writer,
+ struct lttng_channel_attr *attr)
+{
+ int ret;
+
+ ret = config_writer_write_element_string(writer,
+ config_element_overwrite_mode,
+ attr->overwrite ? config_overwrite_mode_overwrite :
+ config_overwrite_mode_discard);
+ if (ret) {
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_subbuf_size, attr->subbuf_size);
+ if (ret) {
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_num_subbuf,
+ attr->num_subbuf);
+ if (ret) {
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_switch_timer_interval,
+ attr->switch_timer_interval);
+ if (ret) {
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_read_timer_interval,
+ attr->read_timer_interval);
+ if (ret) {
+ goto end;
+ }
+
+ ret = config_writer_write_element_string(writer,
+ config_element_output_type,
+ attr->output == LTTNG_EVENT_SPLICE ?
+ config_output_type_splice : config_output_type_mmap);
+ if (ret) {
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_tracefile_size, attr->tracefile_size);
+ if (ret) {
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_tracefile_count,
+ attr->tracefile_count);
+ if (ret) {
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_live_timer_interval,
+ attr->live_timer_interval);
+ if (ret) {
+ goto end;
+ }
+end:
+ return ret ? LTTNG_ERR_SAVE_IO_FAIL : 0;
+}
+
+static
+int save_ust_channel_attributes(struct config_writer *writer,
+ struct lttng_ust_channel_attr *attr)
+{
+ int ret;
+
+ ret = config_writer_write_element_string(writer,
+ config_element_overwrite_mode,
+ attr->overwrite ? config_overwrite_mode_overwrite :
+ config_overwrite_mode_discard);
+ if (ret) {
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_subbuf_size, attr->subbuf_size);
+ if (ret) {
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_num_subbuf,
+ attr->num_subbuf);
+ if (ret) {
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_switch_timer_interval,
+ attr->switch_timer_interval);
+ if (ret) {
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_read_timer_interval,
+ attr->read_timer_interval);
+ if (ret) {
+ goto end;
+ }
+
+ ret = config_writer_write_element_string(writer,
+ config_element_output_type,
+ attr->output == LTTNG_UST_MMAP ?
+ config_output_type_mmap : config_output_type_splice);
+ if (ret) {
+ goto end;
+ }
+end:
+ return ret ? LTTNG_ERR_SAVE_IO_FAIL : 0;
+}
+
+static
+const char *get_kernel_instrumentation_string(
+ enum lttng_kernel_instrumentation instrumentation)
+{
+ const char *instrumentation_string;
+
+ switch (instrumentation) {
+ case LTTNG_KERNEL_ALL:
+ instrumentation_string = config_event_type_all;
+ break;
+ case LTTNG_KERNEL_TRACEPOINT:
+ instrumentation_string = config_event_type_tracepoint;
+ break;
+ case LTTNG_KERNEL_KPROBE:
+ instrumentation_string = config_event_type_kprobe;
+ break;
+ case LTTNG_KERNEL_FUNCTION:
+ instrumentation_string = config_event_type_function;
+ break;
+ case LTTNG_KERNEL_KRETPROBE:
+ instrumentation_string = config_event_type_kretprobe;
+ break;
+ case LTTNG_KERNEL_NOOP:
+ instrumentation_string = config_event_type_noop;
+ break;
+ case LTTNG_KERNEL_SYSCALL:
+ instrumentation_string = config_event_type_syscall;
+ break;
+ default:
+ instrumentation_string = NULL;
+ }
+
+ return instrumentation_string;
+}
+
+static
+const char *get_kernel_context_type_string(
+ enum lttng_kernel_context_type context_type)
+{
+ const char *context_type_string;
+
+ switch (context_type) {
+ case LTTNG_KERNEL_CONTEXT_PID:
+ context_type_string = config_event_context_pid;
+ break;
+ case LTTNG_KERNEL_CONTEXT_PROCNAME:
+ context_type_string = config_event_context_procname;
+ break;
+ case LTTNG_KERNEL_CONTEXT_PRIO:
+ context_type_string = config_event_context_prio;
+ break;
+ case LTTNG_KERNEL_CONTEXT_NICE:
+ context_type_string = config_event_context_nice;
+ break;
+ case LTTNG_KERNEL_CONTEXT_VPID:
+ context_type_string = config_event_context_vpid;
+ break;
+ case LTTNG_KERNEL_CONTEXT_TID:
+ context_type_string = config_event_context_tid;
+ break;
+ case LTTNG_KERNEL_CONTEXT_VTID:
+ context_type_string = config_event_context_vtid;
+ break;
+ case LTTNG_KERNEL_CONTEXT_PPID:
+ context_type_string = config_event_context_ppid;
+ break;
+ case LTTNG_KERNEL_CONTEXT_VPPID:
+ context_type_string = config_event_context_vppid;
+ break;
+ case LTTNG_KERNEL_CONTEXT_HOSTNAME:
+ context_type_string = config_event_context_hostname;
+ break;
+ default:
+ context_type_string = NULL;
+ }
+
+ return context_type_string;
+}
+
+static
+const char *get_ust_context_type_string(
+ enum lttng_ust_context_type context_type)
+{
+ const char *context_type_string;
+
+ switch (context_type) {
+ case LTTNG_UST_CONTEXT_PROCNAME:
+ context_type_string = config_event_context_procname;
+ break;
+ case LTTNG_UST_CONTEXT_VPID:
+ context_type_string = config_event_context_vpid;
+ break;
+ case LTTNG_UST_CONTEXT_VTID:
+ context_type_string = config_event_context_vtid;
+ break;
+ case LTTNG_UST_CONTEXT_IP:
+ context_type_string = config_event_context_ip;
+ break;
+ case LTTNG_UST_CONTEXT_PTHREAD_ID:
+ context_type_string = config_event_context_pthread_id;
+ break;
+ default:
+ context_type_string = NULL;
+ }
+
+ return context_type_string;
+}
+
+static
+const char *get_buffer_type_string(
+ enum lttng_buffer_type buffer_type)
+{
+ const char *buffer_type_string;
+
+ switch (buffer_type) {
+ case LTTNG_BUFFER_PER_PID:
+ buffer_type_string = config_buffer_type_per_pid;
+ break;
+ case LTTNG_BUFFER_PER_UID:
+ buffer_type_string = config_buffer_type_per_uid;
+ break;
+ case LTTNG_BUFFER_GLOBAL:
+ buffer_type_string = config_buffer_type_global;
+ break;
+ default:
+ buffer_type_string = NULL;
+ }
+
+ return buffer_type_string;
+}
+
+static
+const char *get_loglevel_type_string(
+ enum lttng_ust_loglevel_type loglevel_type)
+{
+ const char *loglevel_type_string;
+
+ switch (loglevel_type) {
+ case LTTNG_UST_LOGLEVEL_ALL:
+ loglevel_type_string = config_loglevel_type_all;
+ break;
+ case LTTNG_UST_LOGLEVEL_RANGE:
+ loglevel_type_string = config_loglevel_type_range;
+ break;
+ case LTTNG_UST_LOGLEVEL_SINGLE:
+ loglevel_type_string = config_loglevel_type_single;
+ break;
+ default:
+ loglevel_type_string = NULL;
+ }
+
+ return loglevel_type_string;
+}
+
+static
+int save_kernel_event(struct config_writer *writer,
+ struct ltt_kernel_event *event)
+{
+ int ret;
+ const char *instrumentation_type;
+
+ ret = config_writer_open_element(writer, config_element_event);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ if (event->event->name[0]) {
+ ret = config_writer_write_element_string(writer,
+ config_element_name, event->event->name);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ ret = config_writer_write_element_bool(writer, config_element_enabled,
+ event->enabled);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ instrumentation_type = get_kernel_instrumentation_string(
+ event->event->instrumentation);
+ if (!instrumentation_type) {
+ ret = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = config_writer_write_element_string(writer, config_element_type,
+ instrumentation_type);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ if (event->event->instrumentation == LTTNG_KERNEL_FUNCTION ||
+ event->event->instrumentation == LTTNG_KERNEL_KPROBE ||
+ event->event->instrumentation == LTTNG_KERNEL_KRETPROBE) {
+
+ ret = config_writer_open_element(writer,
+ config_element_attributes);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ switch (event->event->instrumentation) {
+ case LTTNG_KERNEL_FUNCTION:
+ ret = config_writer_open_element(writer,
+ config_element_function_attributes);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_write_element_string(writer,
+ config_element_name,
+ event->event->u.ftrace.symbol_name);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ /* /function attributes */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ break;
+ case LTTNG_KERNEL_KPROBE:
+ case LTTNG_KERNEL_KRETPROBE:
+ {
+ const char *symbol_name;
+ uint64_t addr;
+ uint64_t offset;
+
+ if (event->event->instrumentation ==
+ LTTNG_KERNEL_KPROBE) {
+ /*
+ * Comments in lttng-kernel.h mention that
+ * either addr or symbol_name are set, not both.
+ */
+ addr = event->event->u.kprobe.addr;
+ offset = event->event->u.kprobe.offset;
+ symbol_name = addr ? NULL :
+ event->event->u.kprobe.symbol_name;
+ } else {
+ symbol_name =
+ event->event->u.kretprobe.symbol_name;
+ addr = event->event->u.kretprobe.addr;
+ offset = event->event->u.kretprobe.offset;
+ }
+
+ ret = config_writer_open_element(writer,
+ config_element_probe_attributes);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ if (symbol_name) {
+ ret = config_writer_write_element_string(writer,
+ config_element_symbol_name,
+ symbol_name);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ if (addr) {
+ ret = config_writer_write_element_unsigned_int(
+ writer, config_element_address, addr);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ if (offset) {
+ ret = config_writer_write_element_unsigned_int(
+ writer, config_element_offset, offset);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ break;
+ }
+ default:
+ ERR("Unsupported kernel instrumentation type.");
+ ret = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ /* /attributes */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ /* /event */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+static
+int save_kernel_events(struct config_writer *writer,
+ struct ltt_kernel_event_list *event_list)
+{
+ int ret;
+ struct ltt_kernel_event *event;
+
+ ret = config_writer_open_element(writer, config_element_events);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ cds_list_for_each_entry(event, &event_list->head, list) {
+ ret = save_kernel_event(writer, event);
+ if (ret) {
+ goto end;
+ }
+ }
+
+ /* /events */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+static
+int save_ust_event(struct config_writer *writer,
+ struct ltt_ust_event *event)
+{
+ int ret;
+ const char *loglevel_type_string;
+
+ ret = config_writer_open_element(writer, config_element_event);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ if (event->attr.name[0]) {
+ ret = config_writer_write_element_string(writer,
+ config_element_name, event->attr.name);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ ret = config_writer_write_element_bool(writer, config_element_enabled,
+ event->enabled);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ if (event->attr.instrumentation != LTTNG_UST_TRACEPOINT) {
+ ERR("Unsupported UST instrumentation type.");
+ ret = LTTNG_ERR_INVALID;
+ goto end;
+ }
+ ret = config_writer_write_element_string(writer, config_element_type,
+ config_event_type_tracepoint);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ loglevel_type_string = get_loglevel_type_string(
+ event->attr.loglevel_type);
+ if (!loglevel_type_string) {
+ ERR("Unsupported UST loglevel type.");
+ ret = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = config_writer_write_element_string(writer,
+ config_element_loglevel_type, loglevel_type_string);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_write_element_signed_int(writer,
+ config_element_loglevel, event->attr.loglevel);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ if (event->filter_expression) {
+ ret = config_writer_write_element_string(writer,
+ config_element_filter, event->filter_expression);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ if (event->exclusion && event->exclusion->count) {
+ uint32_t i;
+
+ ret = config_writer_open_element(writer,
+ config_element_exclusions);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ for (i = 0; i < event->exclusion->count; i++) {
+ ret = config_writer_write_element_string(writer,
+ config_element_exclusion,
+ &event->exclusion->names[0][i]);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ /* /exclusions */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ /* /event */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+static
+int save_ust_events(struct config_writer *writer,
+ struct lttng_ht *events)
+{
+ int ret;
+ struct ltt_ust_event *event;
+ struct lttng_ht_node_str *node;
+ struct lttng_ht_iter iter;
+
+ ret = config_writer_open_element(writer, config_element_events);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ rcu_read_lock();
+ cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) {
+ event = caa_container_of(node, struct ltt_ust_event, node);
+
+ ret = save_ust_event(writer, event);
+ if (ret) {
+ rcu_read_unlock();
+ goto end;
+ }
+ }
+ rcu_read_unlock();
+
+ /* /events */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+static
+int save_kernel_context(struct config_writer *writer,
+ struct lttng_kernel_context *ctx)
+{
+ int ret = 0;
+
+ if (!ctx) {
+ goto end;
+ }
+
+ ret = config_writer_open_element(writer, config_element_contexts);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_open_element(writer, config_element_context);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ if (ctx->ctx == LTTNG_KERNEL_CONTEXT_PERF_COUNTER) {
+ ret = config_writer_open_element(writer, config_element_perf);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_type, ctx->u.perf_counter.type);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_config, ctx->u.perf_counter.config);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_write_element_string(writer,
+ config_element_name, ctx->u.perf_counter.name);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ /* /perf */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ } else {
+ const char *context_type_string =
+ get_kernel_context_type_string(ctx->ctx);
+
+ if (!context_type_string) {
+ ERR("Unsupported kernel context type.");
+ ret = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = config_writer_write_element_string(writer,
+ config_element_type, context_type_string);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ /* /context */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ /* /contexts */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+static
+int save_ust_context(struct config_writer *writer,
+ struct cds_list_head *ctx_list)
+{
+ int ret;
+ struct ltt_ust_context *ctx;
+
+ assert(writer);
+ assert(ctx_list);
+
+ ret = config_writer_open_element(writer, config_element_contexts);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ cds_list_for_each_entry(ctx, ctx_list, list) {
+ const char *context_type_string;
+
+ context_type_string = get_ust_context_type_string(ctx->ctx.ctx);
+ if (!context_type_string) {
+ ERR("Unsupported UST context type.")
+ ret = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = config_writer_open_element(writer,
+ config_element_context);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_write_element_string(writer,
+ config_element_type, context_type_string);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ /* /context */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ /* /contexts */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+static
+int save_kernel_channel(struct config_writer *writer,
+ struct ltt_kernel_channel *kchan)
+{
+ int ret;
+
+ assert(writer);
+ assert(kchan);
+
+ ret = config_writer_open_element(writer, config_element_channel);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_write_element_string(writer, config_element_name,
+ kchan->channel->name);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_write_element_bool(writer, config_element_enabled,
+ kchan->channel->enabled);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = save_kernel_channel_attributes(writer, &kchan->channel->attr);
+ if (ret) {
+ goto end;
+ }
+
+ ret = save_kernel_events(writer, &kchan->events_list);
+ if (ret) {
+ goto end;
+ }
+
+ ret = save_kernel_context(writer, kchan->ctx);
+ if (ret) {
+ goto end;
+ }
+
+ /* /channel */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+static
+int save_ust_channel(struct config_writer *writer,
+ struct ltt_ust_channel *ust_chan,
+ struct ltt_ust_session *session)
+{
+ int ret;
+
+ assert(writer);
+ assert(ust_chan);
+ assert(session);
+
+ ret = config_writer_open_element(writer, config_element_channel);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_write_element_string(writer, config_element_name,
+ ust_chan->name);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_write_element_bool(writer, config_element_enabled,
+ ust_chan->enabled);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = save_ust_channel_attributes(writer, &ust_chan->attr);
+ if (ret) {
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_tracefile_size, ust_chan->tracefile_size);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_tracefile_count, ust_chan->tracefile_count);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_live_timer_interval,
+ session->live_timer_interval);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = save_ust_events(writer, ust_chan->events);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = save_ust_context(writer, &ust_chan->ctx_list);
+ if (ret) {
+ goto end;
+ }
+
+ /* /channel */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+static
+int save_kernel_session(struct config_writer *writer,
+ struct ltt_session *session)
+{
+ int ret;
+ struct ltt_kernel_channel *kchan;
+
+ assert(writer);
+ assert(session);
+
+ ret = config_writer_write_element_string(writer, config_element_type,
+ config_domain_type_kernel);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_write_element_string(writer,
+ config_element_buffer_type, config_buffer_type_global);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_open_element(writer,
+ config_element_channels);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ cds_list_for_each_entry(kchan, &session->kernel_session->channel_list.head,
+ list) {
+ ret = save_kernel_channel(writer, kchan);
+ if (ret) {
+ goto end;
+ }
+ }
+
+ /* /channels */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+static
+int save_ust_session(struct config_writer *writer,
+ struct ltt_session *session, int save_jul)
+{
+ int ret;
+ struct ltt_ust_channel *ust_chan;
+ const char *buffer_type_string;
+ struct lttng_ht_node_str *node;
+ struct lttng_ht_iter iter;
+
+ assert(writer);
+ assert(session);
+
+ ret = config_writer_write_element_string(writer, config_element_type,
+ save_jul ? config_domain_type_jul : config_domain_type_ust);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ buffer_type_string = get_buffer_type_string(
+ session->ust_session->buffer_type);
+ if (!buffer_type_string) {
+ ERR("Unsupported buffer type.");
+ ret = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ ret = config_writer_write_element_string(writer,
+ config_element_buffer_type, buffer_type_string);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_open_element(writer, config_element_channels);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ rcu_read_lock();
+ cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
+ &iter.iter, node, node) {
+ int jul_channel;
+
+ ust_chan = caa_container_of(node, struct ltt_ust_channel, node);
+ jul_channel = !strcmp(DEFAULT_JUL_CHANNEL_NAME, ust_chan->name);
+ if (!(save_jul ^ jul_channel)) {
+ ret = save_ust_channel(writer, ust_chan, session->ust_session);
+ if (ret) {
+ rcu_read_unlock();
+ goto end;
+ }
+ }
+ }
+ rcu_read_unlock();
+
+ /* /channels */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+static
+int save_domains(struct config_writer *writer, struct ltt_session *session)
+{
+ int ret = 0;
+
+ assert(writer);
+ assert(session);
+
+ if (!session->kernel_session && !session->ust_session) {
+ goto end;
+ }
+
+ ret = config_writer_open_element(writer, config_element_domains);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+
+ if (session->kernel_session) {
+ ret = config_writer_open_element(writer,
+ config_element_domain);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = save_kernel_session(writer, session);
+ if (ret) {
+ goto end;
+ }
+
+ /* /domain */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ if (session->ust_session) {
+ ret = config_writer_open_element(writer,
+ config_element_domain);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = save_ust_session(writer, session, 0);
+ if (ret) {
+ goto end;
+ }
+
+ /* /domain */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ if (session->ust_session &&
+ session->ust_session->domain_jul.being_used) {
+ ret = config_writer_open_element(writer,
+ config_element_domain);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = save_ust_session(writer, session, 1);
+ if (ret) {
+ goto end;
+ }
+
+ /* /domain */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ /* /domains */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+static
+int save_consumer_output(struct config_writer *writer,
+ struct consumer_output *output)
+{
+ int ret;
+
+ assert(writer);
+ assert(output);
+
+ ret = config_writer_open_element(writer, config_element_consumer_output);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_write_element_bool(writer, config_element_enabled,
+ output->enabled);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_open_element(writer, config_element_destination);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ switch (output->type) {
+ case CONSUMER_DST_LOCAL:
+ ret = config_writer_write_element_string(writer,
+ config_element_path, output->dst.trace_path);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ break;
+ case CONSUMER_DST_NET:
+ {
+ char *uri;
+
+ uri = zmalloc(PATH_MAX);
+ if (!uri) {
+ ret = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ ret = config_writer_open_element(writer, config_element_net_output);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end_net_output;
+ }
+
+ if (output->dst.net.control_isset &&
+ output->dst.net.data_isset) {
+ ret = uri_to_str_url(&output->dst.net.control, uri, PATH_MAX);
+ if (ret < 0) {
+ ret = LTTNG_ERR_INVALID;
+ goto end_net_output;
+ }
+
+ ret = config_writer_write_element_string(writer,
+ config_element_control_uri, uri);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end_net_output;
+ }
+
+ ret = uri_to_str_url(&output->dst.net.data, uri, PATH_MAX);
+ if (ret < 0) {
+ ret = LTTNG_ERR_INVALID;
+ goto end_net_output;
+ }
+
+ ret = config_writer_write_element_string(writer,
+ config_element_data_uri, uri);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end_net_output;
+ }
+
+end_net_output:
+ free(uri);
+ if (ret) {
+ goto end;
+ }
+ } else {
+ ret = !output->dst.net.control_isset ?
+ LTTNG_ERR_URL_CTRL_MISS :
+ LTTNG_ERR_URL_DATA_MISS;
+ goto end;
+ }
+
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ break;
+ }
+ default:
+ ERR("Unsupported consumer output type.");
+ ret = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ /* /destination */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ /* /consumer_output */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+static
+int save_snapshot_outputs(struct config_writer *writer,
+ struct snapshot *snapshot)
+{
+ int ret;
+ struct lttng_ht_iter iter;
+ struct snapshot_output *output;
+
+ assert(writer);
+ assert(snapshot);
+
+ ret = config_writer_open_element(writer, config_element_snapshot_outputs);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ rcu_read_lock();
+ cds_lfht_for_each_entry(snapshot->output_ht->ht, &iter.iter, output,
+ node.node) {
+ ret = config_writer_open_element(writer,
+ config_element_output);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end_unlock;
+ }
+
+ ret = config_writer_write_element_string(writer,
+ config_element_name, output->name);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end_unlock;
+ }
+
+ ret = config_writer_write_element_unsigned_int(writer,
+ config_element_max_size, output->max_size);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end_unlock;
+ }
+
+ ret = save_consumer_output(writer, output->consumer);
+ if (ret) {
+ goto end_unlock;
+ }
+
+ /* /output */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end_unlock;
+ }
+ }
+ rcu_read_unlock();
+
+ /* /snapshot_outputs */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+end:
+ return ret;
+end_unlock:
+ rcu_read_unlock();
+ return ret;
+}
+
+static
+int save_session_output(struct config_writer *writer,
+ struct ltt_session *session)
+{
+ int ret;
+
+ assert(writer);
+ assert(session);
+
+ if ((session->snapshot_mode && session->snapshot.nb_output == 0) ||
+ (!session->snapshot_mode && !session->consumer)) {
+ /* Session is in no output mode */
+ ret = 0;
+ goto end;
+ }
+
+ ret = config_writer_open_element(writer, config_element_output);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ if (session->snapshot_mode) {
+ ret = save_snapshot_outputs(writer, &session->snapshot);
+ if (ret) {
+ goto end;
+ }
+ } else {
+ if (session->consumer) {
+ ret = save_consumer_output(writer, session->consumer);
+ if (ret) {
+ goto end;
+ }
+ }
+ }
+
+ /* /output */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+end:
+ return ret;
+}
+
+/*
+ * Save the given session.
+ *
+ * Return 0 on success else a LTTNG_ERR* code.
+ */
+static
+int save_session(struct ltt_session *session,
+ struct lttng_save_session_attr *attr, lttng_sock_cred *creds)
+{
+ int ret, fd;
+ char config_file_path[PATH_MAX];
+ size_t len;
+ struct config_writer *writer = NULL;
+ size_t session_name_len;
+ const char *provided_path;
+
+ assert(session);
+ assert(attr);
+ assert(creds);
+
+ session_name_len = strlen(session->name);
+
+ if (!session_access_ok(session,
+ LTTNG_SOCK_GET_UID_CRED(creds),
+ LTTNG_SOCK_GET_GID_CRED(creds))) {
+ ret = LTTNG_ERR_EPERM;
+ goto end;
+ }
+
+ provided_path = lttng_save_session_attr_get_output_url(attr);
+ if (provided_path) {
+ len = strlen(provided_path);
+ if (len > PATH_MAX) {
+ ret = LTTNG_ERR_SET_URL;
+ goto end;
+ }
+ strncpy(config_file_path, provided_path, len);
+ } else {
+ char *home_dir = utils_get_user_home_dir(
+ LTTNG_SOCK_GET_UID_CRED(creds));
+ if (!home_dir) {
+ ret = LTTNG_ERR_SET_URL;
+ goto end;
+ }
+
+ len = snprintf(config_file_path, PATH_MAX,
+ DEFAULT_SESSION_HOME_CONFIGPATH, home_dir);
+ free(home_dir);
+ if (len < 0) {
+ PERROR("snprintf save session");
+ ret = LTTNG_ERR_SET_URL;
+ goto end;
+ }
+ }
+
+ /*
+ * Check the path fits in PATH_MAX, including the / followed by trailing
+ * .lttng extension and the NULL terminated string.
+ */
+ if (len + session_name_len + 2 +
+ sizeof(DEFAULT_SESSION_CONFIG_FILE_EXTENSION) > PATH_MAX) {
+ ret = LTTNG_ERR_SET_URL;
+ goto end;
+ }
+
+ ret = run_as_mkdir_recursive(config_file_path, S_IRWXU | S_IRWXG,
+ LTTNG_SOCK_GET_UID_CRED(creds), LTTNG_SOCK_GET_GID_CRED(creds));
+ if (ret) {
+ ret = LTTNG_ERR_SET_URL;
+ goto end;
+ }
+
+ config_file_path[len++] = '/';
+ strncpy(config_file_path + len, session->name, session_name_len);
+ len += session_name_len;
+ strcpy(config_file_path + len, DEFAULT_SESSION_CONFIG_FILE_EXTENSION);
+
+ if (!access(config_file_path, F_OK) && !attr->overwrite) {
+ /* A file with the same name already exists, skip */
+ goto end;
+ }
+
+ fd = run_as_open(config_file_path, O_CREAT | O_WRONLY | O_TRUNC,
+ S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
+ LTTNG_SOCK_GET_UID_CRED(creds), LTTNG_SOCK_GET_GID_CRED(creds));
+ if (fd < 0) {
+ PERROR("Could not create configuration file");
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ writer = config_writer_create(fd);
+ if (!writer) {
+ ret = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ ret = config_writer_open_element(writer, config_element_sessions);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_open_element(writer, config_element_session);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = config_writer_write_element_string(writer, config_element_name,
+ session->name);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ ret = save_domains(writer, session);
+ if (ret) {
+ goto end;
+ }
+
+ ret = config_writer_write_element_bool(writer, config_element_started,
+ session->enabled);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ if (session->snapshot_mode || session->live_timer) {
+ ret = config_writer_open_element(writer, config_element_attributes);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ if (session->snapshot_mode) {
+ ret = config_writer_write_element_bool(writer,
+ config_element_snapshot_mode, 1);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ } else {
+ ret = config_writer_write_element_signed_int(writer,
+ config_element_live_timer_interval, session->live_timer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ /* /attributes */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+ }
+
+ ret = save_session_output(writer, session);
+ if (ret) {
+ goto end;
+ }
+
+ /* /session */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+
+ /* /sessions */
+ ret = config_writer_close_element(writer);
+ if (ret) {
+ ret = LTTNG_ERR_SAVE_IO_FAIL;
+ goto end;
+ }
+end:
+ if (writer && config_writer_destroy(writer)) {
+ /* Preserve the original error code */
+ ret = ret ? ret : LTTNG_ERR_SAVE_IO_FAIL;
+ }
+ if (ret) {
+ /* Delete file in case of error */
+ if (unlink(config_file_path)) {
+ PERROR("Unlinking XML session configuration.");
+ }
+ }
+
+ return ret;
+}
+
+int cmd_save_sessions(struct lttng_save_session_attr *attr,
+ lttng_sock_cred *creds)
+{
+ int ret;
+ const char *session_name;
+ struct ltt_session *session;
+
+ session_lock_list();
+
+ session_name = lttng_save_session_attr_get_session_name(attr);
+ if (session_name) {
+ session = session_find_by_name(session_name);
+ if (!session) {
+ ret = LTTNG_ERR_SESS_NOT_FOUND;
+ goto end;
+ }
+
+ session_lock(session);
+ ret = save_session(session, attr, creds);
+ session_unlock(session);
+ if (ret) {
+ goto end;
+ }
+ } else {
+ struct ltt_session_list *list = session_get_list();
+
+ cds_list_for_each_entry(session, &list->head, list) {
+ session_lock(session);
+ ret = save_session(session, attr, creds);
+ session_unlock(session);
+
+ /* Don't abort if we don't have the required permissions. */
+ if (ret && ret != LTTNG_ERR_EPERM) {
+ goto end;
+ }
+ }
+ }
+ ret = LTTNG_OK;
+
+end:
+ session_unlock_list();
+ return ret;
+}
projects / lttng-tools.git / commitdiff
