#include "liblttsessiondcomm.h"
#include "ltt-sessiond.h"
#include "lttngerr.h"
+#include "kernel-ctl.h"
#include "session.h"
#include "trace.h"
#include "traceable-app.h"
+/*
+ * TODO:
+ * teardown: signal SIGTERM handler -> write into pipe. Threads waits
+ * with epoll on pipe and on other pipes/sockets for commands. Main
+ * simply waits on pthread join.
+ */
+
/* Const values */
const char default_home_dir[] = DEFAULT_HOME_DIR;
const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
static int ust_connect_app(pid_t pid);
static int init_daemon_socket(void);
static int notify_apps(const char* name);
-static int process_client_msg(int sock, struct lttcomm_session_msg*);
+static int process_client_msg(struct command_ctx *cmd_ctx);
static int send_unix_sock(int sock, void *buf, size_t len);
static int set_signal_handler(void);
static int set_permissions(void);
-static int setup_data_buffer(char **buf, size_t size, struct lttcomm_lttng_header *llh);
+static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size);
static int create_lttng_rundir(void);
static int set_kconsumerd_sockets(void);
static void cleanup(void);
-static void copy_common_data(struct lttcomm_lttng_header *llh, struct lttcomm_session_msg *lsm);
static void sighandler(int sig);
+static void clean_command_ctx(struct command_ctx *cmd_ctx);
static void *thread_manage_clients(void *data);
static void *thread_manage_apps(void *data);
static int client_sock;
static int apps_sock;
static int kconsumerd_err_sock;
-
-/* Extern in session.h */
-struct ltt_session *current_session;
+static int kernel_tracer_fd;
/*
* thread_manage_kconsumerd
int sock, ret;
/* TODO: Something more elegant is needed but fine for now */
+ /* FIXME: change all types to either uint8_t, uint32_t, uint64_t
+ * for 32-bit vs 64-bit compat processes. */
+ /* replicate in ust with version number */
struct {
int reg; /* 1:register, 0:unregister */
pid_t pid;
DBG("[thread] Manage apps started");
- /* Notify all applications to register */
- notify_apps(default_global_apps_pipe);
-
ret = lttcomm_listen_unix_sock(apps_sock);
if (ret < 0) {
goto error;
}
+ /* Notify all applications to register */
+ notify_apps(default_global_apps_pipe);
+
while (1) {
+ DBG("Accepting application registration");
/* Blocking call, waiting for transmission */
sock = lttcomm_accept_unix_sock(apps_sock);
if (sock < 0) {
static void *thread_manage_clients(void *data)
{
int sock, ret;
- struct lttcomm_session_msg lsm;
+ struct command_ctx *cmd_ctx;
DBG("[thread] Manage client started");
while (1) {
/* Blocking call, waiting for transmission */
+ DBG("Accepting client command ...");
sock = lttcomm_accept_unix_sock(client_sock);
if (sock < 0) {
goto error;
}
+ /* Allocate context command to process the client request */
+ cmd_ctx = malloc(sizeof(struct command_ctx));
+
+ /* Allocate data buffer for reception */
+ cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg));
+ cmd_ctx->llm = NULL;
+ cmd_ctx->session = NULL;
+
/*
* Data is received from the lttng client. The struct
- * lttcomm_session_msg (lsm) contains the command and data
- * request of the client.
+ * lttcomm_session_msg (lsm) contains the command and data request of
+ * the client.
*/
- ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm));
+ DBG("Receiving data from client ...");
+ ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg));
if (ret <= 0) {
continue;
}
- /* This function dispatch the work to the LTTng or UST libs
- * and then sends back the response to the client. This is needed
- * because there might be more then one lttcomm_lttng_header to
- * send out so process_client_msg do both jobs.
+ /*
+ * This function dispatch the work to the kernel or userspace tracer
+ * libs and fill the lttcomm_lttng_msg data structure of all the needed
+ * informations for the client. The command context struct contains
+ * everything this function may needs.
*/
- ret = process_client_msg(sock, &lsm);
+ ret = process_client_msg(cmd_ctx);
if (ret < 0) {
+ /* TODO: Inform client somehow of the fatal error. At this point,
+ * ret < 0 means that a malloc failed (ENOMEM). */
/* Error detected but still accept command */
+ clean_command_ctx(cmd_ctx);
continue;
}
+
+ DBG("Sending response (size: %d, retcode: %d)",
+ cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code);
+ ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
+ if (ret < 0) {
+ ERR("Failed to send data back to client");
+ }
+
+ clean_command_ctx(cmd_ctx);
}
error:
return lttcomm_send_unix_sock(sock, buf, len);
}
+/*
+ * clean_command_ctx
+ *
+ * Free memory of a command context structure.
+ */
+static void clean_command_ctx(struct command_ctx *cmd_ctx)
+{
+ DBG("Clean command context structure %p", cmd_ctx);
+ if (cmd_ctx) {
+ if (cmd_ctx->llm) {
+ free(cmd_ctx->llm);
+ }
+ if (cmd_ctx->lsm) {
+ free(cmd_ctx->lsm);
+ }
+ free(cmd_ctx);
+ cmd_ctx = NULL;
+ }
+}
+
/*
* ust_connect_app
*
}
/*
- * copy_common_data
- *
- * Copy common data between lttcomm_lttng_header and lttcomm_session_msg
- */
-static void copy_common_data(struct lttcomm_lttng_header *llh, struct lttcomm_session_msg *lsm)
-{
- llh->cmd_type = lsm->cmd_type;
- llh->pid = lsm->pid;
-
- /* Manage uuid */
- if (!uuid_is_null(lsm->session_id)) {
- uuid_copy(llh->session_id, lsm->session_id);
- }
-
- strncpy(llh->trace_name, lsm->trace_name, strlen(llh->trace_name));
- llh->trace_name[strlen(llh->trace_name) - 1] = '\0';
-}
-
-/*
- * setup_data_buffer
+ * setup_lttng_msg
*
- * Setup the outgoing data buffer for the response
- * data allocating the right amount of memory.
+ * Setup the outgoing data buffer for the response (llm) by allocating the
+ * right amount of memory and copying the original information from the lsm
+ * structure.
*
* Return total size of the buffer pointed by buf.
*/
-static int setup_data_buffer(char **buf, size_t s_data, struct lttcomm_lttng_header *llh)
+static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
{
- int ret = 0;
- size_t buf_size;
+ int ret, buf_size, trace_name_size;
+
+ /*
+ * Check for the trace_name. If defined, it's part of the payload data of
+ * the llm structure.
+ */
+ trace_name_size = strlen(cmd_ctx->lsm->trace_name);
+ buf_size = trace_name_size + size;
- buf_size = sizeof(struct lttcomm_lttng_header) + s_data;
- *buf = malloc(buf_size);
- if (*buf == NULL) {
+ cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
+ if (cmd_ctx->llm == NULL) {
perror("malloc");
- ret = -1;
+ ret = -ENOMEM;
goto error;
}
- /* Setup lttcomm_lttng_header data and copy
- * it to the newly allocated buffer.
- */
- llh->payload_size = s_data;
- memcpy(*buf, llh, sizeof(struct lttcomm_lttng_header));
+ /* Copy common data */
+ cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
+ cmd_ctx->llm->pid = cmd_ctx->lsm->pid;
+ if (!uuid_is_null(cmd_ctx->lsm->session_uuid)) {
+ uuid_copy(cmd_ctx->llm->session_uuid, cmd_ctx->lsm->session_uuid);
+ }
+
+ cmd_ctx->llm->trace_name_offset = trace_name_size;
+ cmd_ctx->llm->data_size = size;
+ cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
+
+ /* Copy trace name to the llm structure. Begining of the payload. */
+ memcpy(cmd_ctx->llm->payload, cmd_ctx->lsm->trace_name, trace_name_size);
return buf_size;
/*
* process_client_msg
*
- * This takes the lttcomm_session_msg struct and process the command requested
- * by the client. It then creates response(s) and send it back to the
- * given socket (sock).
+ * Process the command requested by the lttng client within the command
+ * context structure. This function make sure that the return structure (llm)
+ * is set and ready for transmission before returning.
*
* Return any error encountered or 0 for success.
*/
-static int process_client_msg(int sock, struct lttcomm_session_msg *lsm)
+static int process_client_msg(struct command_ctx *cmd_ctx)
{
- int ust_sock, ret, buf_size;
- size_t header_size;
- char *send_buf = NULL;
- struct lttcomm_lttng_header llh;
-
- DBG("Processing client message");
+ int ret;
- /* Copy common data to identify the response
- * on the lttng client side.
- */
- copy_common_data(&llh, lsm);
+ DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
/* Check command that needs a session */
- if (lsm->cmd_type != LTTNG_CREATE_SESSION &&
- lsm->cmd_type != LTTNG_LIST_SESSIONS &&
- lsm->cmd_type != UST_LIST_APPS)
- {
- current_session = find_session_by_uuid(lsm->session_id);
- if (current_session == NULL) {
+ switch (cmd_ctx->lsm->cmd_type) {
+ case LTTNG_CREATE_SESSION:
+ case LTTNG_LIST_SESSIONS:
+ case UST_LIST_APPS:
+ break;
+ default:
+ cmd_ctx->session = find_session_by_uuid(cmd_ctx->lsm->session_uuid);
+ if (cmd_ctx->session == NULL) {
ret = LTTCOMM_SELECT_SESS;
- goto end;
+ goto error;
}
+ break;
}
- /* Default return code.
- * In our world, everything is OK... right? ;)
- */
- llh.ret_code = LTTCOMM_OK;
-
- header_size = sizeof(struct lttcomm_lttng_header);
+ /* Check command for kernel tracing */
+ switch (cmd_ctx->lsm->cmd_type) {
+ case KERNEL_CREATE_SESSION:
+ case KERNEL_CREATE_CHANNEL:
+ case KERNEL_DISABLE_EVENT:
+ case KERNEL_ENABLE_EVENT:
+ case KERNEL_OPEN_METADATA:
+ case KERNEL_START_TRACE:
+ case KERNEL_STOP_TRACE:
+ /* TODO: reconnect to kernel tracer to check if
+ * it's loadded */
+ if (kernel_tracer_fd == 0) {
+ ret = LTTCOMM_KERN_NA;
+ goto error;
+ }
+ break;
+ }
/* Connect to ust apps if available pid */
- if (lsm->pid != 0) {
+ if (cmd_ctx->lsm->pid > 0) {
/* Connect to app using ustctl API */
- ust_sock = ust_connect_app(lsm->pid);
- if (ust_sock < 0) {
+ cmd_ctx->ust_sock = ust_connect_app(cmd_ctx->lsm->pid);
+ if (cmd_ctx->ust_sock < 0) {
ret = LTTCOMM_NO_TRACEABLE;
- goto end;
+ goto error;
}
}
/* Process by command type */
- switch (lsm->cmd_type) {
- case LTTNG_CREATE_SESSION:
- {
- ret = create_session(lsm->session_name, &llh.session_id);
- if (ret < 0) {
- if (ret == -1) {
- ret = LTTCOMM_EXIST_SESS;
- } else {
- ret = LTTCOMM_FATAL;
- }
- goto end;
- }
+ switch (cmd_ctx->lsm->cmd_type) {
+ case KERNEL_CREATE_SESSION:
+ {
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
- buf_size = setup_data_buffer(&send_buf, 0, &llh);
- if (buf_size < 0) {
- ret = LTTCOMM_FATAL;
- goto end;
- }
+ DBG("Creating kernel session");
- break;
+ ret = kernel_create_session(cmd_ctx, kernel_tracer_fd);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_SESS_FAIL;
+ goto error;
}
- case LTTNG_DESTROY_SESSION:
- {
- ret = destroy_session(&lsm->session_id);
- if (ret < 0) {
- ret = LTTCOMM_NO_SESS;
- } else {
- ret = LTTCOMM_OK;
- }
- /* No auxiliary data so only send the llh struct. */
- goto end;
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case KERNEL_CREATE_CHANNEL:
+ {
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
}
- case LTTNG_LIST_TRACES:
- {
- unsigned int trace_count = get_trace_count_per_session(current_session);
- if (trace_count == 0) {
- ret = LTTCOMM_NO_TRACE;
- goto end;
- }
+ DBG("Creating kernel session");
- buf_size = setup_data_buffer(&send_buf,
- sizeof(struct lttng_trace) * trace_count, &llh);
- if (buf_size < 0) {
- ret = LTTCOMM_FATAL;
- goto end;
- }
+ ret = kernel_create_channel(cmd_ctx);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_CHAN_FAIL;
+ goto error;
+ }
- get_traces_per_session(current_session, (struct lttng_trace *)(send_buf + header_size));
- break;
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case KERNEL_ENABLE_EVENT:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
}
- case UST_CREATE_TRACE:
- {
- ret = ust_create_trace(ust_sock, lsm->pid);
- if (ret < 0) {
- /* If -1 is returned from ust_create_trace, malloc
- * failed so it's pretty much a fatal error.
- */
- ret = LTTCOMM_FATAL;
- goto end;
- }
- /* No auxiliary data so only send the llh struct. */
- goto end;
+ DBG("Enabling kernel event %s", cmd_ctx->lsm->u.event.event_name);
+
+ ret = kernel_enable_event(cmd_ctx->session->kernel_session->channel, cmd_ctx->lsm->u.event.event_name);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_ENABLE_FAIL;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case KERNEL_OPEN_METADATA:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ DBG("Open kernel metadata");
+
+ ret = kernel_open_metadata(cmd_ctx->session->kernel_session);
+ if (ret < 0) {
+ ret = LTTCOMM_KERN_META_FAIL;
+ goto error;
+ }
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_CREATE_SESSION:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
}
- case UST_LIST_APPS:
- {
- unsigned int app_count = get_app_count();
- /* Stop right now if no apps */
- if (app_count == 0) {
- ret = LTTCOMM_NO_APPS;
- goto end;
- }
- /* Setup data buffer and details for transmission */
- buf_size = setup_data_buffer(&send_buf,
- sizeof(pid_t) * app_count, &llh);
- if (buf_size < 0) {
+ ret = create_session(cmd_ctx->lsm->session_name, &cmd_ctx->llm->session_uuid);
+ if (ret < 0) {
+ if (ret == -1) {
+ ret = LTTCOMM_EXIST_SESS;
+ } else {
ret = LTTCOMM_FATAL;
- goto end;
}
+ goto error;
+ }
- get_app_list_pids((pid_t *)(send_buf + header_size));
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_DESTROY_SESSION:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
- break;
+ ret = destroy_session(&cmd_ctx->lsm->session_uuid);
+ if (ret < 0) {
+ ret = LTTCOMM_NO_SESS;
+ goto error;
}
- case UST_START_TRACE:
- {
- ret = ust_start_trace(ust_sock, lsm->pid);
- /* No auxiliary data so only send the llh struct. */
- goto end;
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case LTTNG_LIST_TRACES:
+ {
+ unsigned int trace_count;
+
+ trace_count = get_trace_count_per_session(cmd_ctx->session);
+ if (trace_count == 0) {
+ ret = LTTCOMM_NO_TRACE;
+ goto error;
}
- case UST_STOP_TRACE:
- {
- ret = ust_stop_trace(ust_sock, lsm->pid);
- /* No auxiliary data so only send the llh struct. */
- goto end;
+ ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_trace) * trace_count);
+ if (ret < 0) {
+ goto setup_error;
}
- case LTTNG_LIST_SESSIONS:
- {
- unsigned int session_count = get_session_count();
- /* Stop right now if no session */
- if (session_count == 0) {
- ret = LTTCOMM_NO_SESS;
- goto end;
- }
- /* Setup data buffer and details for transmission */
- buf_size = setup_data_buffer(&send_buf,
- (sizeof(struct lttng_session) * session_count), &llh);
- if (buf_size < 0) {
- ret = LTTCOMM_FATAL;
- goto end;
- }
+ get_traces_per_session(cmd_ctx->session,
+ (struct lttng_trace *)(cmd_ctx->llm->payload));
- get_lttng_session((struct lttng_session *)(send_buf + header_size));
+ ret = LTTCOMM_OK;
+ break;
+ }
+ case UST_CREATE_TRACE:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
- break;
+ ret = ust_create_trace(cmd_ctx);
+ if (ret < 0) {
+ goto setup_error;
}
- default:
- {
- /* Undefined command */
- ret = LTTCOMM_UND;
- goto end;
+ break;
+ }
+ case UST_LIST_APPS:
+ {
+ unsigned int app_count;
+
+ app_count = get_app_count();
+ DBG("Traceable application count : %d", app_count);
+ if (app_count == 0) {
+ ret = LTTCOMM_NO_APPS;
+ goto error;
}
+
+ ret = setup_lttng_msg(cmd_ctx, sizeof(pid_t) * app_count);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ get_app_list_pids((pid_t *)(cmd_ctx->llm->payload));
+
+ ret = LTTCOMM_OK;
+ break;
}
+ case UST_START_TRACE:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
- ret = send_unix_sock(sock, send_buf, buf_size);
+ ret = ust_start_trace(cmd_ctx);
+ if (ret < 0) {
+ goto setup_error;
+ }
+ break;
+ }
+ case UST_STOP_TRACE:
+ {
+ /* Setup lttng message with no payload */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
- if (send_buf != NULL) {
- free(send_buf);
+ ret = ust_stop_trace(cmd_ctx);
+ if (ret < 0) {
+ goto setup_error;
+ }
+ break;
}
+ case LTTNG_LIST_SESSIONS:
+ {
+ unsigned int session_count;
+
+ session_count = get_session_count();
+ if (session_count == 0) {
+ ret = LTTCOMM_NO_SESS;
+ goto error;
+ }
+
+ ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * session_count);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ get_lttng_session((struct lttng_session *)(cmd_ctx->llm->payload));
+
+ ret = LTTCOMM_OK;
+ break;
+ }
+ default:
+ /* Undefined command */
+ ret = setup_lttng_msg(cmd_ctx, 0);
+ if (ret < 0) {
+ goto setup_error;
+ }
+
+ ret = LTTCOMM_UND;
+ break;
+ }
+
+ /* Set return code */
+ cmd_ctx->llm->ret_code = ret;
return ret;
-end:
- DBG("Return code to client %d", ret);
+error:
+ if (cmd_ctx->llm == NULL) {
+ DBG("Missing llm structure. Allocating one.");
+ if (setup_lttng_msg(cmd_ctx, 0) < 0) {
+ goto setup_error;
+ }
+ }
/* Notify client of error */
- llh.ret_code = ret;
- llh.payload_size = 0;
- send_unix_sock(sock, (void*) &llh, sizeof(llh));
+ cmd_ctx->llm->ret_code = ret;
+setup_error:
return ret;
}
/*
* set_permissions
*
- * Set the tracing group gid onto the client socket.
+ * Set the tracing group gid onto the client socket.
+ *
+ * Race window between mkdir and chown is OK because we are going from
+ * less permissive (root.root) to more permissive (root.tracing).
*/
static int set_permissions(void)
{
return ret;
}
+/*
+ * init_kernel_tracer
+ *
+ * Setup necessary data for kernel tracer action.
+ */
+static void init_kernel_tracer(void)
+{
+ /* Set the global kernel tracer fd */
+ kernel_tracer_fd = open(DEFAULT_KERNEL_TRACER_PATH, O_RDWR);
+ if (kernel_tracer_fd < 0) {
+ WARN("No kernel tracer available");
+ kernel_tracer_fd = 0;
+ }
+}
+
/*
* set_kconsumerd_sockets
*
if (ret < 0) {
ERR("Unable to clean " LTTNG_RUNDIR);
}
+
+ // TODO Clean kernel trace fds
+ close(kernel_tracer_fd);
}
/*
if (ret < 0) {
goto error;
}
+
+ /* Setup kernel tracer */
+ init_kernel_tracer();
} else {
if (strlen(apps_unix_sock_path) == 0) {
snprintf(apps_unix_sock_path, PATH_MAX,
}
}
+ DBG("Client socket path %s", client_unix_sock_path);
+ DBG("Application socket path %s", apps_unix_sock_path);
+
/* See if daemon already exist. If any of the two
* socket needed by the daemon are present, this test fails
*/
/* We do not goto error because we must not
* cleanup() because a daemon is already running.
*/
- return EXIT_FAILURE;
+ exit(EXIT_FAILURE);
}
if (set_signal_handler() < 0) {
}
cleanup();
- return 0;
+ exit(EXIT_SUCCESS);
error:
cleanup();
-
- return EXIT_FAILURE;
+ exit(EXIT_FAILURE);
}
projects / lttng-tools.git / blobdiff