+/*
+ * Check if the symbol field passed by the user is in fact an address or an
+ * offset from a symbol. Those two instrumentation types are not supported yet.
+ * It's expected to be a common mistake because of the existing --probe option
+ * that does support these formats.
+ *
+ * Here are examples of these unsupported formats for the --userspace-probe
+ * option:
+ * elf:/path/to/binary:0x400430
+ * elf:/path/to/binary:4194364
+ * elf:/path/to/binary:my_symbol+0x323
+ * elf:/path/to/binary:my_symbol+43
+ */
+static int warn_userspace_probe_syntax(const char *symbol)
+{
+ int ret;
+
+ /* Check if the symbol field is an hex address. */
+ ret = sscanf(symbol, "0x%*x");
+ if (ret > 0) {
+ /* If there is a match, print a warning and return an error. */
+ ERR("Userspace probe on address not supported yet.");
+ ret = CMD_UNSUPPORTED;
+ goto error;
+ }
+
+ /* Check if the symbol field is an decimal address. */
+ ret = sscanf(symbol, "%*u");
+ if (ret > 0) {
+ /* If there is a match, print a warning and return an error. */
+ ERR("Userspace probe on address not supported yet.");
+ ret = CMD_UNSUPPORTED;
+ goto error;
+ }
+
+ /* Check if the symbol field is symbol+hex_offset. */
+ ret = sscanf(symbol, "%*[^+]+0x%*x");
+ if (ret > 0) {
+ /* If there is a match, print a warning and return an error. */
+ ERR("Userspace probe on symbol+offset not supported yet.");
+ ret = CMD_UNSUPPORTED;
+ goto error;
+ }
+
+ /* Check if the symbol field is symbol+decimal_offset. */
+ ret = sscanf(symbol, "%*[^+]+%*u");
+ if (ret > 0) {
+ /* If there is a match, print a warning and return an error. */
+ ERR("Userspace probe on symbol+offset not supported yet.");
+ ret = CMD_UNSUPPORTED;
+ goto error;
+ }
+
+ ret = 0;
+
+error:
+ return ret;
+}
+
+/*
+ * Parse userspace probe options
+ * Set the userspace probe fields in the lttng_event struct and set the
+ * target_path to the path to the binary.
+ */
+static int parse_userspace_probe_opts(struct lttng_event *ev, char *opt)
+{
+ int ret = CMD_SUCCESS;
+ int num_token;
+ char **tokens;
+ char *target_path = NULL;
+ char *unescaped_target_path = NULL;
+ char *real_target_path = NULL;
+ char *symbol_name = NULL, *probe_name = NULL, *provider_name = NULL;
+ struct lttng_userspace_probe_location *probe_location = NULL;
+ struct lttng_userspace_probe_location_lookup_method *lookup_method =
+ NULL;
+
+ if (opt == NULL) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ switch (ev->type) {
+ case LTTNG_EVENT_USERSPACE_PROBE:
+ break;
+ default:
+ assert(0);
+ }
+
+ /*
+ * userspace probe fields are separated by ':'.
+ */
+ tokens = strutils_split(opt, ':', 1);
+ num_token = strutils_array_of_strings_len(tokens);
+
+ /*
+ * Early sanity check that the number of parameter is between 2 and 4
+ * inclusively.
+ * elf:PATH:SYMBOL
+ * std:PATH:PROVIDER_NAME:PROBE_NAME
+ * PATH:SYMBOL (same behavior as ELF)
+ */
+ if (num_token < 2 || num_token > 4) {
+ ret = CMD_ERROR;
+ goto end_string;
+ }
+
+ /*
+ * Looking up the first parameter will tell the technique to use to
+ * interpret the userspace probe/function description.
+ */
+ switch (num_token) {
+ case 2:
+ /* When the probe type is omitted we assume ELF for now. */
+ case 3:
+ if (num_token == 3 && strcmp(tokens[0], "elf") == 0) {
+ target_path = tokens[1];
+ symbol_name = tokens[2];
+ } else if (num_token == 2) {
+ target_path = tokens[0];
+ symbol_name = tokens[1];
+ } else {
+ ret = CMD_ERROR;
+ goto end_string;
+ }
+ lookup_method =
+ lttng_userspace_probe_location_lookup_method_function_elf_create();
+ if (!lookup_method) {
+ WARN("Failed to create ELF lookup method");
+ ret = CMD_ERROR;
+ goto end_string;
+ }
+ break;
+ case 4:
+ if (strcmp(tokens[0], "sdt") == 0) {
+ target_path = tokens[1];
+ provider_name = tokens[2];
+ probe_name = tokens[3];
+ } else {
+ ret = CMD_ERROR;
+ goto end_string;
+ }
+ lookup_method =
+ lttng_userspace_probe_location_lookup_method_tracepoint_sdt_create();
+ if (!lookup_method) {
+ WARN("Failed to create SDT lookup method");
+ ret = CMD_ERROR;
+ goto end_string;
+ }
+ break;
+ default:
+ ret = CMD_ERROR;
+ goto end_string;
+ }
+
+ /* strutils_unescape_string allocates a new char *. */
+ unescaped_target_path = strutils_unescape_string(target_path, 0);
+ if (!unescaped_target_path) {
+ ret = CMD_ERROR;
+ goto end_destroy_lookup_method;
+ }
+
+ /*
+ * If there is not forward slash in the path. Walk the $PATH else
+ * expand.
+ */
+ if (strchr(unescaped_target_path, '/') == NULL) {
+ /* Walk the $PATH variable to find the targeted binary. */
+ real_target_path = zmalloc(LTTNG_PATH_MAX * sizeof(char));
+ if (!real_target_path) {
+ PERROR("Error allocating path buffer");
+ ret = CMD_ERROR;
+ goto end_destroy_lookup_method;
+ }
+ ret = walk_command_search_path(unescaped_target_path, real_target_path);
+ if (ret) {
+ ERR("Binary not found.");
+ ret = CMD_ERROR;
+ goto end_destroy_lookup_method;
+ }
+ } else {
+ /*
+ * Expand references to `/./` and `/../`. This function does not check
+ * if the file exists. This call returns an allocated buffer on
+ * success.
+ */
+ real_target_path = utils_expand_path_keep_symlink(unescaped_target_path);
+ if (!real_target_path) {
+ ERR("Error expanding the path to binary.");
+ ret = CMD_ERROR;
+ goto end_destroy_lookup_method;
+ }
+
+ /*
+ * Check if the file exists using access(2), If it does not,
+ * return an error.
+ */
+ ret = access(real_target_path, F_OK);
+ if (ret) {
+ ERR("Cannot find binary at path: %s.", real_target_path);
+ ret = CMD_ERROR;
+ goto end_destroy_lookup_method;
+ }
+ }
+
+ switch (lttng_userspace_probe_location_lookup_method_get_type(lookup_method)) {
+ case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
+ /*
+ * Check for common mistakes in userspace probe description syntax.
+ */
+ ret = warn_userspace_probe_syntax(symbol_name);
+ if (ret) {
+ goto end_destroy_lookup_method;
+ }
+
+ probe_location = lttng_userspace_probe_location_function_create(
+ real_target_path, symbol_name, lookup_method);
+ if (!probe_location) {
+ WARN("Failed to create function probe location");
+ ret = CMD_ERROR;
+ goto end_destroy_lookup_method;
+ }
+
+ /* Ownership transferred to probe_location. */
+ lookup_method = NULL;
+
+ ret = lttng_event_set_userspace_probe_location(ev, probe_location);
+ if (ret) {
+ WARN("Failed to set probe location on event");
+ ret = CMD_ERROR;
+ goto end_destroy_location;
+ }
+ break;
+ case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT:
+ probe_location = lttng_userspace_probe_location_tracepoint_create(
+ real_target_path, provider_name, probe_name, lookup_method);
+ if (!probe_location) {
+ WARN("Failed to create function probe location");
+ ret = CMD_ERROR;
+ goto end_destroy_lookup_method;
+ }
+
+ /* Ownership transferred to probe_location. */
+ lookup_method = NULL;
+
+ ret = lttng_event_set_userspace_probe_location(ev, probe_location);
+ if (ret) {
+ WARN("Failed to set probe location on event");
+ ret = CMD_ERROR;
+ goto end_destroy_location;
+ }
+ break;
+ default:
+ ret = CMD_ERROR;
+ goto end_destroy_lookup_method;
+ }
+
+ /* Successful parsing, now clean up everything and return. */
+ goto end_string;
+
+end_destroy_location:
+ lttng_userspace_probe_location_destroy(probe_location);
+end_destroy_lookup_method:
+ lttng_userspace_probe_location_lookup_method_destroy(lookup_method);
+end_string:
+ strutils_free_null_terminated_array_of_strings(tokens);
+ /*
+ * Freeing both char * here makes the error handling simplier. free()
+ * performs not action if the pointer is NULL.
+ */
+ free(real_target_path);
+ free(unescaped_target_path);
+end:
+ return ret;
+}
+
+/*
+ * Maps LOG4j loglevel from string to value
+ */
+static int loglevel_log4j_str_to_value(const char *inputstr)
+{
+ int i = 0;
+ char str[LTTNG_SYMBOL_NAME_LEN];
+
+ if (!inputstr || strlen(inputstr) == 0) {
+ return -1;
+ }
+
+ /*
+ * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
+ * added at the end of the loop so a the upper bound we avoid the overflow.
+ */
+ while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
+ str[i] = toupper(inputstr[i]);
+ i++;
+ }
+ str[i] = '\0';
+
+ if (!strcmp(str, "LOG4J_OFF") || !strcmp(str, "OFF")) {
+ return LTTNG_LOGLEVEL_LOG4J_OFF;
+ } else if (!strcmp(str, "LOG4J_FATAL") || !strcmp(str, "FATAL")) {
+ return LTTNG_LOGLEVEL_LOG4J_FATAL;
+ } else if (!strcmp(str, "LOG4J_ERROR") || !strcmp(str, "ERROR")) {
+ return LTTNG_LOGLEVEL_LOG4J_ERROR;
+ } else if (!strcmp(str, "LOG4J_WARN") || !strcmp(str, "WARN")) {
+ return LTTNG_LOGLEVEL_LOG4J_WARN;
+ } else if (!strcmp(str, "LOG4J_INFO") || !strcmp(str, "INFO")) {
+ return LTTNG_LOGLEVEL_LOG4J_INFO;
+ } else if (!strcmp(str, "LOG4J_DEBUG") || !strcmp(str, "DEBUG")) {
+ return LTTNG_LOGLEVEL_LOG4J_DEBUG;
+ } else if (!strcmp(str, "LOG4J_TRACE") || !strcmp(str, "TRACE")) {
+ return LTTNG_LOGLEVEL_LOG4J_TRACE;
+ } else if (!strcmp(str, "LOG4J_ALL") || !strcmp(str, "ALL")) {
+ return LTTNG_LOGLEVEL_LOG4J_ALL;
+ } else {
+ return -1;
+ }
+}
+
+/*
+ * Maps JUL loglevel from string to value
+ */
+static int loglevel_jul_str_to_value(const char *inputstr)
+{
+ int i = 0;
+ char str[LTTNG_SYMBOL_NAME_LEN];
+
+ if (!inputstr || strlen(inputstr) == 0) {
+ return -1;
+ }
+
+ /*
+ * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
+ * added at the end of the loop so a the upper bound we avoid the overflow.
+ */
+ while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
+ str[i] = toupper(inputstr[i]);
+ i++;
+ }
+ str[i] = '\0';
+
+ if (!strcmp(str, "JUL_OFF") || !strcmp(str, "OFF")) {
+ return LTTNG_LOGLEVEL_JUL_OFF;
+ } else if (!strcmp(str, "JUL_SEVERE") || !strcmp(str, "SEVERE")) {
+ return LTTNG_LOGLEVEL_JUL_SEVERE;
+ } else if (!strcmp(str, "JUL_WARNING") || !strcmp(str, "WARNING")) {
+ return LTTNG_LOGLEVEL_JUL_WARNING;
+ } else if (!strcmp(str, "JUL_INFO") || !strcmp(str, "INFO")) {
+ return LTTNG_LOGLEVEL_JUL_INFO;
+ } else if (!strcmp(str, "JUL_CONFIG") || !strcmp(str, "CONFIG")) {
+ return LTTNG_LOGLEVEL_JUL_CONFIG;
+ } else if (!strcmp(str, "JUL_FINE") || !strcmp(str, "FINE")) {
+ return LTTNG_LOGLEVEL_JUL_FINE;
+ } else if (!strcmp(str, "JUL_FINER") || !strcmp(str, "FINER")) {
+ return LTTNG_LOGLEVEL_JUL_FINER;
+ } else if (!strcmp(str, "JUL_FINEST") || !strcmp(str, "FINEST")) {
+ return LTTNG_LOGLEVEL_JUL_FINEST;
+ } else if (!strcmp(str, "JUL_ALL") || !strcmp(str, "ALL")) {
+ return LTTNG_LOGLEVEL_JUL_ALL;
+ } else {
+ return -1;
+ }
+}
+
+/*
+ * Maps Python loglevel from string to value
+ */
+static int loglevel_python_str_to_value(const char *inputstr)
+{
+ int i = 0;
+ char str[LTTNG_SYMBOL_NAME_LEN];
+
+ if (!inputstr || strlen(inputstr) == 0) {
+ return -1;
+ }
+
+ /*
+ * Loop up to LTTNG_SYMBOL_NAME_LEN minus one because the NULL bytes is
+ * added at the end of the loop so a the upper bound we avoid the overflow.
+ */
+ while (i < (LTTNG_SYMBOL_NAME_LEN - 1) && inputstr[i] != '\0') {
+ str[i] = toupper(inputstr[i]);
+ i++;
+ }
+ str[i] = '\0';
+
+ if (!strcmp(str, "PYTHON_CRITICAL") || !strcmp(str, "CRITICAL")) {
+ return LTTNG_LOGLEVEL_PYTHON_CRITICAL;
+ } else if (!strcmp(str, "PYTHON_ERROR") || !strcmp(str, "ERROR")) {
+ return LTTNG_LOGLEVEL_PYTHON_ERROR;
+ } else if (!strcmp(str, "PYTHON_WARNING") || !strcmp(str, "WARNING")) {
+ return LTTNG_LOGLEVEL_PYTHON_WARNING;
+ } else if (!strcmp(str, "PYTHON_INFO") || !strcmp(str, "INFO")) {
+ return LTTNG_LOGLEVEL_PYTHON_INFO;
+ } else if (!strcmp(str, "PYTNON_DEBUG") || !strcmp(str, "DEBUG")) {
+ return LTTNG_LOGLEVEL_PYTHON_DEBUG;
+ } else if (!strcmp(str, "PYTHON_NOTSET") || !strcmp(str, "NOTSET")) {
+ return LTTNG_LOGLEVEL_PYTHON_NOTSET;
+ } else {
+ return -1;
+ }
+}
+