*/
#define _GNU_SOURCE
+#include <assert.h>
#include <grp.h>
#include <errno.h>
#include <stdio.h>
#include <common/common.h>
#include <common/defaults.h>
#include <common/sessiond-comm/sessiond-comm.h>
+#include <common/uri.h>
#include <lttng/lttng.h>
+#include "filter-ast.h"
+#include "filter-parser.h"
+#include "filter-bytecode.h"
+#include "memstream.h"
+
+#ifdef DEBUG
+const int print_xml = 1;
+#define dbg_printf(fmt, args...) \
+ printf("[debug liblttng-ctl] " fmt, ## args)
+#else
+const int print_xml = 0;
+#define dbg_printf(fmt, args...) \
+do { \
+ /* do nothing but check printf format */ \
+ if (0) \
+ printf("[debug liblttnctl] " fmt, ## args); \
+} while (0)
+#endif
+
+
/* Socket to session daemon for communication */
static int sessiond_socket;
static char sessiond_sock_path[PATH_MAX];
+static char health_sock_path[PATH_MAX];
/* Variables */
static char *tracing_group;
int lttng_opt_quiet;
int lttng_opt_verbose;
+static void set_default_url_attr(struct lttng_uri *uri,
+ enum lttng_stream_type stype)
+{
+ uri->stype = stype;
+ if (uri->dtype != LTTNG_DST_PATH && uri->port == 0) {
+ uri->port = (stype == LTTNG_STREAM_CONTROL) ?
+ DEFAULT_NETWORK_CONTROL_PORT : DEFAULT_NETWORK_DATA_PORT;
+ }
+}
+
+/*
+ * Parse a string URL and creates URI(s) returning the size of the populated
+ * array.
+ */
+static ssize_t parse_str_urls_to_uri(const char *ctrl_url, const char *data_url,
+ struct lttng_uri **uris)
+{
+ int ret;
+ unsigned int equal = 1, idx = 0;
+ /* Add the "file://" size to the URL maximum size */
+ char url[PATH_MAX + 7];
+ ssize_t size_ctrl = 0, size_data = 0, size;
+ struct lttng_uri *ctrl_uris = NULL, *data_uris = NULL;
+ struct lttng_uri *tmp_uris = NULL;
+
+ /* No URL(s) is allowed. This means that the consumer will be disabled. */
+ if (ctrl_url == NULL && data_url == NULL) {
+ return 0;
+ }
+
+ /* Check if URLs are equal and if so, only use the control URL */
+ if (ctrl_url && data_url) {
+ equal = !strcmp(ctrl_url, data_url);
+ }
+
+ /*
+ * Since we allow the str_url to be a full local filesystem path, we are
+ * going to create a valid file:// URL if it's the case.
+ *
+ * Check if first character is a '/' or else reject the URL.
+ */
+ if (ctrl_url && ctrl_url[0] == '/') {
+ ret = snprintf(url, sizeof(url), "file://%s", ctrl_url);
+ if (ret < 0) {
+ PERROR("snprintf file url");
+ goto parse_error;
+ }
+ ctrl_url = url;
+ }
+
+ /* Parse the control URL if there is one */
+ if (ctrl_url) {
+ size_ctrl = uri_parse(ctrl_url, &ctrl_uris);
+ if (size_ctrl < 1) {
+ ERR("Unable to parse the URL %s", ctrl_url);
+ goto parse_error;
+ }
+
+ /* At this point, we know there is at least one URI in the array */
+ set_default_url_attr(&ctrl_uris[0], LTTNG_STREAM_CONTROL);
+
+ if (ctrl_uris[0].dtype == LTTNG_DST_PATH && data_url) {
+ ERR("Can not have a data URL when destination is file://");
+ goto error;
+ }
+
+ /* URL are not equal but the control URL uses a net:// protocol */
+ if (size_ctrl == 2) {
+ if (!equal) {
+ ERR("Control URL uses the net:// protocol and the data URL is "
+ "different. Not allowed.");
+ goto error;
+ } else {
+ set_default_url_attr(&ctrl_uris[1], LTTNG_STREAM_DATA);
+ /*
+ * The data_url and ctrl_url are equal and the ctrl_url
+ * contains a net:// protocol so we just skip the data part.
+ */
+ data_url = NULL;
+ }
+ }
+ }
+
+ if (data_url) {
+ /* We have to parse the data URL in this case */
+ size_data = uri_parse(data_url, &data_uris);
+ if (size_data < 1) {
+ ERR("Unable to parse the URL %s", data_url);
+ goto error;
+ } else if (size_data == 2) {
+ ERR("Data URL can not be set with the net[4|6]:// protocol");
+ goto error;
+ }
+
+ set_default_url_attr(&data_uris[0], LTTNG_STREAM_DATA);
+ }
+
+ /* Compute total size */
+ size = size_ctrl + size_data;
+
+ tmp_uris = zmalloc(sizeof(struct lttng_uri) * size);
+ if (tmp_uris == NULL) {
+ PERROR("zmalloc uris");
+ goto error;
+ }
+
+ if (ctrl_uris) {
+ /* It's possible the control URIs array contains more than one URI */
+ memcpy(tmp_uris, ctrl_uris, sizeof(struct lttng_uri) * size_ctrl);
+ ++idx;
+ }
+
+ if (data_uris) {
+ memcpy(&tmp_uris[idx], data_uris, sizeof(struct lttng_uri));
+ }
+
+ *uris = tmp_uris;
+
+ return size;
+
+error:
+ free(ctrl_uris);
+ free(data_uris);
+ free(tmp_uris);
+parse_error:
+ return -1;
+}
+
/*
* Copy string from src to dst and enforce null terminated byte.
*/
{
if (src && dst) {
switch (src->type) {
- case LTTNG_DOMAIN_KERNEL:
- case LTTNG_DOMAIN_UST:
- /*
- case LTTNG_DOMAIN_UST_EXEC_NAME:
- case LTTNG_DOMAIN_UST_PID:
- case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
- */
- memcpy(dst, src, sizeof(struct lttng_domain));
- break;
- default:
- memset(dst, 0, sizeof(struct lttng_domain));
- dst->type = LTTNG_DOMAIN_KERNEL;
- break;
+ case LTTNG_DOMAIN_KERNEL:
+ case LTTNG_DOMAIN_UST:
+ /*
+ case LTTNG_DOMAIN_UST_EXEC_NAME:
+ case LTTNG_DOMAIN_UST_PID:
+ case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
+ */
+ memcpy(dst, src, sizeof(struct lttng_domain));
+ break;
+ default:
+ memset(dst, 0, sizeof(struct lttng_domain));
+ break;
}
}
}
goto end;
}
+ DBG("LSM cmd type : %d", lsm->cmd_type);
+
ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
sizeof(struct lttcomm_session_msg));
return ret;
}
+/*
+ * Send var len data to the session daemon.
+ *
+ * On success, returns the number of bytes sent (>=0)
+ * On error, returns -1
+ */
+static int send_session_varlen(void *data, size_t len)
+{
+ int ret;
+
+ if (!connected) {
+ ret = -ENOTCONN;
+ goto end;
+ }
+
+ if (!data || !len) {
+ ret = 0;
+ goto end;
+ }
+
+ ret = lttcomm_send_unix_sock(sessiond_socket, data, len);
+
+end:
+ return ret;
+}
+
/*
* Receive data from the sessiond socket.
*
/*
* Ask the session daemon a specific command and put the data into buf.
+ * Takes extra var. len. data as input to send to the session daemon.
*
* Return size of data (only payload, not header) or a negative error code.
*/
-static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf)
+static int ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
+ void *vardata, size_t varlen, void **buf)
{
int ret;
size_t size;
if (ret < 0) {
goto end;
}
+ /* Send var len data */
+ ret = send_session_varlen(vardata, varlen);
+ if (ret < 0) {
+ goto end;
+ }
/* Get header from data transmission */
ret = recv_data_sessiond(&llm, sizeof(llm));
}
/* Check error code if OK */
- if (llm.ret_code != LTTCOMM_OK) {
+ if (llm.ret_code != LTTNG_OK) {
ret = -llm.ret_code;
goto end;
}
return ret;
}
+/*
+ * Ask the session daemon a specific command and put the data into buf.
+ *
+ * Return size of data (only payload, not header) or a negative error code.
+ */
+static int ask_sessiond(struct lttcomm_session_msg *lsm, void **buf)
+{
+ return ask_sessiond_varlen(lsm, NULL, 0, buf);
+}
+
/*
* Create lttng handle and return pointer.
* The returned pointer will be NULL in case of malloc() error.
return ask_sessiond(&lsm, NULL);
}
+/*
+ * set filter for an event
+ * Return negative error value on error.
+ * Return size of returned session payload data if OK.
+ */
+
+int lttng_set_event_filter(struct lttng_handle *handle,
+ const char *event_name, const char *channel_name,
+ const char *filter_expression)
+{
+ struct lttcomm_session_msg lsm;
+ struct filter_parser_ctx *ctx;
+ FILE *fmem;
+ int ret = 0;
+
+ /* Safety check. */
+ if (handle == NULL) {
+ return -1;
+ }
+
+ if (!filter_expression) {
+ return 0;
+ }
+
+ /*
+ * casting const to non-const, as the underlying function will
+ * use it in read-only mode.
+ */
+ fmem = lttng_fmemopen((void *) filter_expression,
+ strlen(filter_expression), "r");
+ if (!fmem) {
+ fprintf(stderr, "Error opening memory as stream\n");
+ return -ENOMEM;
+ }
+ ctx = filter_parser_ctx_alloc(fmem);
+ if (!ctx) {
+ fprintf(stderr, "Error allocating parser\n");
+ ret = -ENOMEM;
+ goto alloc_error;
+ }
+ ret = filter_parser_ctx_append_ast(ctx);
+ if (ret) {
+ fprintf(stderr, "Parse error\n");
+ ret = -EINVAL;
+ goto parse_error;
+ }
+ ret = filter_visitor_set_parent(ctx);
+ if (ret) {
+ fprintf(stderr, "Set parent error\n");
+ ret = -EINVAL;
+ goto parse_error;
+ }
+ if (print_xml) {
+ ret = filter_visitor_print_xml(ctx, stdout, 0);
+ if (ret) {
+ fflush(stdout);
+ fprintf(stderr, "XML print error\n");
+ ret = -EINVAL;
+ goto parse_error;
+ }
+ }
+
+ dbg_printf("Generating IR... ");
+ fflush(stdout);
+ ret = filter_visitor_ir_generate(ctx);
+ if (ret) {
+ fprintf(stderr, "Generate IR error\n");
+ ret = -EINVAL;
+ goto parse_error;
+ }
+ dbg_printf("done\n");
+
+ dbg_printf("Validating IR... ");
+ fflush(stdout);
+ ret = filter_visitor_ir_check_binary_op_nesting(ctx);
+ if (ret) {
+ ret = -EINVAL;
+ goto parse_error;
+ }
+ dbg_printf("done\n");
+
+ dbg_printf("Generating bytecode... ");
+ fflush(stdout);
+ ret = filter_visitor_bytecode_generate(ctx);
+ if (ret) {
+ fprintf(stderr, "Generate bytecode error\n");
+ ret = -EINVAL;
+ goto parse_error;
+ }
+ dbg_printf("done\n");
+ dbg_printf("Size of bytecode generated: %u bytes.\n",
+ bytecode_get_len(&ctx->bytecode->b));
+
+ memset(&lsm, 0, sizeof(lsm));
+
+ lsm.cmd_type = LTTNG_SET_FILTER;
+
+ /* Copy channel name */
+ copy_string(lsm.u.filter.channel_name, channel_name,
+ sizeof(lsm.u.filter.channel_name));
+ /* Copy event name */
+ copy_string(lsm.u.filter.event_name, event_name,
+ sizeof(lsm.u.filter.event_name));
+ lsm.u.filter.bytecode_len = sizeof(ctx->bytecode->b)
+ + bytecode_get_len(&ctx->bytecode->b);
+
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+
+ ret = ask_sessiond_varlen(&lsm, &ctx->bytecode->b,
+ lsm.u.filter.bytecode_len, NULL);
+
+ filter_bytecode_free(ctx);
+ filter_ir_free(ctx);
+ filter_parser_ctx_free(ctx);
+ if (fclose(fmem) != 0) {
+ perror("fclose");
+ }
+ return ret;
+
+parse_error:
+ filter_bytecode_free(ctx);
+ filter_ir_free(ctx);
+ filter_parser_ctx_free(ctx);
+alloc_error:
+ if (fclose(fmem) != 0) {
+ perror("fclose");
+ }
+ return ret;
+}
+
/*
* Disable event(s) of a channel and domain.
* If no event name is specified, all events are disabled.
*/
const char *lttng_strerror(int code)
{
- /* lttcomm error codes range from -LTTCOMM_OK down to -LTTCOMM_NR */
- if (code > -LTTCOMM_OK) {
- return "Ended with errors";
- }
-
- return lttcomm_get_readable_code(code);
+ return error_get_str(code);
}
/*
- * Create a brand new session using name and path.
- * Returns size of returned session payload data or a negative error code.
+ * Create a brand new session using name and url for destination.
+ *
+ * Returns LTTNG_OK on success or a negative error code.
*/
-int lttng_create_session(const char *name, const char *path)
+int lttng_create_session(const char *name, const char *url)
{
+ ssize_t size;
struct lttcomm_session_msg lsm;
+ struct lttng_uri *uris = NULL;
+
+ if (name == NULL) {
+ return -1;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
lsm.cmd_type = LTTNG_CREATE_SESSION;
copy_string(lsm.session.name, name, sizeof(lsm.session.name));
- copy_string(lsm.session.path, path, sizeof(lsm.session.path));
- return ask_sessiond(&lsm, NULL);
+ /* There should never be a data URL */
+ size = parse_str_urls_to_uri(url, NULL, &uris);
+ if (size < 0) {
+ return LTTNG_ERR_INVALID;
+ }
+
+ lsm.u.uri.size = size;
+
+ return ask_sessiond_varlen(&lsm, uris, sizeof(struct lttng_uri) * size,
+ NULL);
}
/*
return 1;
}
+/*
+ * Set URL for a consumer for a session and domain.
+ *
+ * Return 0 on success, else a negative value.
+ */
+int lttng_set_consumer_url(struct lttng_handle *handle,
+ const char *control_url, const char *data_url)
+{
+ ssize_t size;
+ struct lttcomm_session_msg lsm;
+ struct lttng_uri *uris = NULL;
+
+ if (handle == NULL || (control_url == NULL && data_url == NULL)) {
+ return -1;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+
+ lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
+
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ size = parse_str_urls_to_uri(control_url, data_url, &uris);
+ if (size < 0) {
+ return LTTNG_ERR_INVALID;
+ }
+
+ lsm.u.uri.size = size;
+
+ return ask_sessiond_varlen(&lsm, uris, sizeof(struct lttng_uri) * size,
+ NULL);
+}
+
+/*
+ * Enable consumer for a session and domain.
+ *
+ * Return 0 on success, else a negative value.
+ */
+int lttng_enable_consumer(struct lttng_handle *handle)
+{
+ struct lttcomm_session_msg lsm;
+
+ if (handle == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_ENABLE_CONSUMER;
+
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ return ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * Disable consumer for a session and domain.
+ *
+ * Return 0 on success, else a negative value.
+ */
+int lttng_disable_consumer(struct lttng_handle *handle)
+{
+ struct lttcomm_session_msg lsm;
+
+ if (handle == NULL) {
+ return -1;
+ }
+
+ lsm.cmd_type = LTTNG_DISABLE_CONSUMER;
+
+ copy_string(lsm.session.name, handle->session_name,
+ sizeof(lsm.session.name));
+ copy_lttng_domain(&lsm.domain, &handle->domain);
+
+ return ask_sessiond(&lsm, NULL);
+}
+
+/*
+ * Set health socket path by putting it in the global health_sock_path
+ * variable.
+ *
+ * Returns 0 on success or assert(0) on ENOMEM.
+ */
+static int set_health_socket_path(void)
+{
+ int ret;
+ int in_tgroup = 0; /* In tracing group */
+ uid_t uid;
+ const char *home;
+
+ uid = getuid();
+
+ if (uid != 0) {
+ /* Are we in the tracing group ? */
+ in_tgroup = check_tracing_group(tracing_group);
+ }
+
+ if ((uid == 0) || in_tgroup) {
+ copy_string(health_sock_path, DEFAULT_GLOBAL_HEALTH_UNIX_SOCK,
+ sizeof(health_sock_path));
+ }
+
+ if (uid != 0) {
+ /*
+ * With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
+ * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
+ */
+ home = getenv("HOME");
+ if (home == NULL) {
+ /* Fallback in /tmp .. */
+ home = "/tmp";
+ }
+
+ ret = snprintf(health_sock_path, sizeof(health_sock_path),
+ DEFAULT_HOME_HEALTH_UNIX_SOCK, home);
+ if ((ret < 0) || (ret >= sizeof(health_sock_path))) {
+ /* ENOMEM at this point... just kill the control lib. */
+ assert(0);
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Check session daemon health for a specific health component.
+ *
+ * Return 0 if health is OK or else 1 if BAD. A return value of -1 indicate
+ * that the control library was not able to connect to the session daemon
+ * health socket.
+ *
+ * Any other positive value is an lttcomm error which can be translate with
+ * lttng_strerror().
+ */
+int lttng_health_check(enum lttng_health_component c)
+{
+ int sock, ret;
+ struct lttcomm_health_msg msg;
+ struct lttcomm_health_data reply;
+
+ /* Connect to the sesssion daemon */
+ sock = lttcomm_connect_unix_sock(health_sock_path);
+ if (sock < 0) {
+ ret = -1;
+ goto error;
+ }
+
+ msg.cmd = LTTNG_HEALTH_CHECK;
+ msg.component = c;
+
+ ret = lttcomm_send_unix_sock(sock, (void *)&msg, sizeof(msg));
+ if (ret < 0) {
+ goto close_error;
+ }
+
+ ret = lttcomm_recv_unix_sock(sock, (void *)&reply, sizeof(reply));
+ if (ret < 0) {
+ goto close_error;
+ }
+
+ ret = reply.ret_code;
+
+close_error:
+ close(sock);
+
+error:
+ return ret;
+}
+
+/*
+ * This is an extension of create session that is ONLY and SHOULD only be used
+ * by the lttng command line program. It exists to avoid using URI parsing in
+ * the lttng client.
+ *
+ * We need the date and time for the trace path subdirectory for the case where
+ * the user does NOT define one using either -o or -U. Using the normal
+ * lttng_create_session API call, we have no clue on the session daemon side if
+ * the URL was generated automatically by the client or define by the user.
+ *
+ * So this function "wrapper" is hidden from the public API, takes the datetime
+ * string and appends it if necessary to the URI subdirectory before sending it
+ * to the session daemon.
+ *
+ * With this extra function, the lttng_create_session call behavior is not
+ * changed and the timestamp is appended to the URI on the session daemon side
+ * if necessary.
+ */
+int _lttng_create_session_ext(const char *name, const char *url,
+ const char *datetime)
+{
+ int ret;
+ ssize_t size;
+ struct lttcomm_session_msg lsm;
+ struct lttng_uri *uris = NULL;
+
+ if (name == NULL || datetime == NULL) {
+ return -1;
+ }
+
+ memset(&lsm, 0, sizeof(lsm));
+
+ lsm.cmd_type = LTTNG_CREATE_SESSION;
+ if (!strncmp(name, DEFAULT_SESSION_NAME, strlen(DEFAULT_SESSION_NAME))) {
+ ret = snprintf(lsm.session.name, sizeof(lsm.session.name), "%s-%s",
+ name, datetime);
+ if (ret < 0) {
+ PERROR("snprintf session name datetime");
+ return -1;
+ }
+ } else {
+ copy_string(lsm.session.name, name, sizeof(lsm.session.name));
+ }
+
+ /* There should never be a data URL */
+ size = parse_str_urls_to_uri(url, NULL, &uris);
+ if (size < 0) {
+ return LTTNG_ERR_INVALID;
+ }
+
+ lsm.u.uri.size = size;
+
+ if (uris[0].dtype != LTTNG_DST_PATH && strlen(uris[0].subdir) == 0) {
+ ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s-%s", name,
+ datetime);
+ if (ret < 0) {
+ PERROR("snprintf uri subdir");
+ return -1;
+ }
+ }
+
+ return ask_sessiond_varlen(&lsm, uris, sizeof(struct lttng_uri) * size,
+ NULL);
+}
+
/*
* lib constructor
*/
{
/* Set default session group */
lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
+ /* Set socket for health check */
+ (void) set_health_socket_path();
}
projects / lttng-tools.git / blobdiff