/* * QError Module * * Copyright (C) 2009 Red Hat Inc. * * Authors: * Luiz Capitulino <lcapitulino@redhat.com> * * This work is licensed under the terms of the GNU LGPL, version 2.1 or later. * See the COPYING.LIB file in the top-level directory. */ #include "monitor.h" #include "qjson.h" #include "qerror.h" #include "qemu-common.h" static void qerror_destroy_obj(QObject *obj); static const QType qerror_type = { .code = QTYPE_QERROR, .destroy = qerror_destroy_obj, }; /** * The 'desc' parameter is a printf-like string, the format of the format * string is: * * %(KEY) * * Where KEY is a QDict key, which has to be passed to qerror_from_info(). * * Example: * * "foo error on device: %(device) slot: %(slot_nr)" * * A single percent sign can be printed if followed by a second one, * for example: * * "running out of foo: %(foo)%%" * * Please keep the entries in alphabetical order. * Use "sed -n '/^static.*qerror_table\[\]/,/^};/s/QERR_/&/gp' qerror.c | sort -c" * to check. */ static const QErrorStringTable qerror_table[] = { { .error_fmt = QERR_BAD_BUS_FOR_DEVICE, .desc = "Device '%(device)' can't go on a %(bad_bus_type) bus", }, { .error_fmt = QERR_BUS_NOT_FOUND, .desc = "Bus '%(bus)' not found", }, { .error_fmt = QERR_BUS_NO_HOTPLUG, .desc = "Bus '%(bus)' does not support hotplugging", }, { .error_fmt = QERR_COMMAND_NOT_FOUND, .desc = "The command %(name) has not been found", }, { .error_fmt = QERR_DEVICE_ENCRYPTED, .desc = "Device '%(device)' is encrypted", }, { .error_fmt = QERR_DEVICE_INIT_FAILED, .desc = "Device '%(device)' could not be initialized", }, { .error_fmt = QERR_DEVICE_IN_USE, .desc = "Device '%(device)' is in use", }, { .error_fmt = QERR_DEVICE_LOCKED, .desc = "Device '%(device)' is locked", }, { .error_fmt = QERR_DEVICE_MULTIPLE_BUSSES, .desc = "Device '%(device)' has multiple child busses", }, { .error_fmt = QERR_DEVICE_NOT_ACTIVE, .desc = "Device '%(device)' has not been activated", }, { .error_fmt = QERR_DEVICE_NOT_ENCRYPTED, .desc = "Device '%(device)' is not encrypted", }, { .error_fmt = QERR_DEVICE_NOT_FOUND, .desc = "Device '%(device)' not found", }, { .error_fmt = QERR_DEVICE_NOT_REMOVABLE, .desc = "Device '%(device)' is not removable", }, { .error_fmt = QERR_DEVICE_NO_BUS, .desc = "Device '%(device)' has no child bus", }, { .error_fmt = QERR_DEVICE_NO_HOTPLUG, .desc = "Device '%(device)' does not support hotplugging", }, { .error_fmt = QERR_DUPLICATE_ID, .desc = "Duplicate ID '%(id)' for %(object)", }, { .error_fmt = QERR_FD_NOT_FOUND, .desc = "File descriptor named '%(name)' not found", }, { .error_fmt = QERR_FD_NOT_SUPPLIED, .desc = "No file descriptor supplied via SCM_RIGHTS", }, { .error_fmt = QERR_INVALID_BLOCK_FORMAT, .desc = "Invalid block format '%(name)'", }, { .error_fmt = QERR_INVALID_PARAMETER, .desc = "Invalid parameter '%(name)'", }, { .error_fmt = QERR_INVALID_PARAMETER_TYPE, .desc = "Invalid parameter type, expected: %(expected)", }, { .error_fmt = QERR_INVALID_PARAMETER_VALUE, .desc = "Parameter '%(name)' expects %(expected)", }, { .error_fmt = QERR_INVALID_PASSWORD, .desc = "Password incorrect", }, { .error_fmt = QERR_JSON_PARSING, .desc = "Invalid JSON syntax", }, { .error_fmt = QERR_JSON_PARSE_ERROR, .desc = "JSON parse error, %(message)", }, { .error_fmt = QERR_KVM_MISSING_CAP, .desc = "Using KVM without %(capability), %(feature) unavailable", }, { .error_fmt = QERR_MIGRATION_EXPECTED, .desc = "An incoming migration is expected before this command can be executed", }, { .error_fmt = QERR_MISSING_PARAMETER, .desc = "Parameter '%(name)' is missing", }, { .error_fmt = QERR_NO_BUS_FOR_DEVICE, .desc = "No '%(bus)' bus found for device '%(device)'", }, { .error_fmt = QERR_OPEN_FILE_FAILED, .desc = "Could not open '%(filename)'", }, { .error_fmt = QERR_PROPERTY_NOT_FOUND, .desc = "Property '%(device).%(property)' not found", }, { .error_fmt = QERR_PROPERTY_VALUE_BAD, .desc = "Property '%(device).%(property)' doesn't take value '%(value)'", }, { .error_fmt = QERR_PROPERTY_VALUE_IN_USE, .desc = "Property '%(device).%(property)' can't take value '%(value)', it's in use", }, { .error_fmt = QERR_PROPERTY_VALUE_NOT_FOUND, .desc = "Property '%(device).%(property)' can't find value '%(value)'", }, { .error_fmt = QERR_QMP_BAD_INPUT_OBJECT, .desc = "Expected '%(expected)' in QMP input", }, { .error_fmt = QERR_QMP_BAD_INPUT_OBJECT_MEMBER, .desc = "QMP input object member '%(member)' expects '%(expected)'", }, { .error_fmt = QERR_QMP_EXTRA_MEMBER, .desc = "QMP input object member '%(member)' is unexpected", }, { .error_fmt = QERR_RESET_REQUIRED, .desc = "Resetting the Virtual Machine is required", }, { .error_fmt = QERR_SET_PASSWD_FAILED, .desc = "Could not set password", }, { .error_fmt = QERR_ADD_CLIENT_FAILED, .desc = "Could not add client", }, { .error_fmt = QERR_TOO_MANY_FILES, .desc = "Too many open files", }, { .error_fmt = QERR_UNDEFINED_ERROR, .desc = "An undefined error has ocurred", }, { .error_fmt = QERR_UNSUPPORTED, .desc = "this feature or command is not currently supported", }, { .error_fmt = QERR_UNKNOWN_BLOCK_FORMAT_FEATURE, .desc = "'%(device)' uses a %(format) feature which is not " "supported by this qemu version: %(feature)", }, { .error_fmt = QERR_VNC_SERVER_FAILED, .desc = "Could not start VNC server on %(target)", }, { .error_fmt = QERR_QGA_LOGGING_FAILED, .desc = "Guest agent failed to log non-optional log statement", }, { .error_fmt = QERR_QGA_COMMAND_FAILED, .desc = "Guest agent command failed, error was '%(message)'", }, {} }; /** * qerror_new(): Create a new QError * * Return strong reference. */ QError *qerror_new(void) { QError *qerr; qerr = g_malloc0(sizeof(*qerr)); QOBJECT_INIT(qerr, &qerror_type); return qerr; } static void GCC_FMT_ATTR(2, 3) qerror_abort(const QError *qerr, const char *fmt, ...) { va_list ap; fprintf(stderr, "qerror: bad call in function '%s':\n", qerr->func); fprintf(stderr, "qerror: -> "); va_start(ap, fmt); vfprintf(stderr, fmt, ap); va_end(ap); fprintf(stderr, "\nqerror: call at %s:%d\n", qerr->file, qerr->linenr); abort(); } static void GCC_FMT_ATTR(2, 0) qerror_set_data(QError *qerr, const char *fmt, va_list *va) { QObject *obj; obj = qobject_from_jsonv(fmt, va); if (!obj) { qerror_abort(qerr, "invalid format '%s'", fmt); } if (qobject_type(obj) != QTYPE_QDICT) { qerror_abort(qerr, "error format is not a QDict '%s'", fmt); } qerr->error = qobject_to_qdict(obj); obj = qdict_get(qerr->error, "class"); if (!obj) { qerror_abort(qerr, "missing 'class' key in '%s'", fmt); } if (qobject_type(obj) != QTYPE_QSTRING) { qerror_abort(qerr, "'class' key value should be a QString"); } obj = qdict_get(qerr->error, "data"); if (!obj) { qerror_abort(qerr, "missing 'data' key in '%s'", fmt); } if (qobject_type(obj) != QTYPE_QDICT) { qerror_abort(qerr, "'data' key value should be a QDICT"); } } static void qerror_set_desc(QError *qerr, const char *fmt) { int i; // FIXME: inefficient loop for (i = 0; qerror_table[i].error_fmt; i++) { if (strcmp(qerror_table[i].error_fmt, fmt) == 0) { qerr->entry = &qerror_table[i]; return; } } qerror_abort(qerr, "error format '%s' not found", fmt); } /** * qerror_from_info(): Create a new QError from error information * * The information consists of: * * - file the file name of where the error occurred * - linenr the line number of where the error occurred * - func the function name of where the error occurred * - fmt JSON printf-like dictionary, there must exist keys 'class' and * 'data' * - va va_list of all arguments specified by fmt * * Return strong reference. */ QError *qerror_from_info(const char *file, int linenr, const char *func, const char *fmt, va_list *va) { QError *qerr; qerr = qerror_new(); loc_save(&qerr->loc); qerr->linenr = linenr; qerr->file = file; qerr->func = func; if (!fmt) { qerror_abort(qerr, "QDict not specified"); } qerror_set_data(qerr, fmt, va); qerror_set_desc(qerr, fmt); return qerr; } static void parse_error(const QErrorStringTable *entry, int c) { fprintf(stderr, "expected '%c' in '%s'", c, entry->desc); abort(); } static const char *append_field(QDict *error, QString *outstr, const QErrorStringTable *entry, const char *start) { QObject *obj; QDict *qdict; QString *key_qs; const char *end, *key; if (*start != '%') parse_error(entry, '%'); start++; if (*start != '(') parse_error(entry, '('); start++; end = strchr(start, ')'); if (!end) parse_error(entry, ')'); key_qs = qstring_from_substr(start, 0, end - start - 1); key = qstring_get_str(key_qs); qdict = qobject_to_qdict(qdict_get(error, "data")); obj = qdict_get(qdict, key); if (!obj) { abort(); } switch (qobject_type(obj)) { case QTYPE_QSTRING: qstring_append(outstr, qdict_get_str(qdict, key)); break; case QTYPE_QINT: qstring_append_int(outstr, qdict_get_int(qdict, key)); break; default: abort(); } QDECREF(key_qs); return ++end; } static QString *qerror_format_desc(QDict *error, const QErrorStringTable *entry) { QString *qstring; const char *p; assert(entry != NULL); qstring = qstring_new(); for (p = entry->desc; *p != '\0';) { if (*p != '%') { qstring_append_chr(qstring, *p++); } else if (*(p + 1) == '%') { qstring_append_chr(qstring, '%'); p += 2; } else { p = append_field(error, qstring, entry, p); } } return qstring; } QString *qerror_format(const char *fmt, QDict *error) { const QErrorStringTable *entry = NULL; int i; for (i = 0; qerror_table[i].error_fmt; i++) { if (strcmp(qerror_table[i].error_fmt, fmt) == 0) { entry = &qerror_table[i]; break; } } return qerror_format_desc(error, entry); } /** * qerror_human(): Format QError data into human-readable string. */ QString *qerror_human(const QError *qerror) { return qerror_format_desc(qerror->error, qerror->entry); } /** * qerror_print(): Print QError data * * This function will print the member 'desc' of the specified QError object, * it uses error_report() for this, so that the output is routed to the right * place (ie. stderr or Monitor's device). */ void qerror_print(QError *qerror) { QString *qstring = qerror_human(qerror); loc_push_restore(&qerror->loc); error_report("%s", qstring_get_str(qstring)); loc_pop(&qerror->loc); QDECREF(qstring); } void qerror_report_internal(const char *file, int linenr, const char *func, const char *fmt, ...) { va_list va; QError *qerror; va_start(va, fmt); qerror = qerror_from_info(file, linenr, func, fmt, &va); va_end(va); if (monitor_cur_is_qmp()) { monitor_set_error(cur_mon, qerror); } else { qerror_print(qerror); QDECREF(qerror); } } /* Evil... */ struct Error { QDict *obj; const char *fmt; char *msg; }; void qerror_report_err(Error *err) { QError *qerr; int i; qerr = qerror_new(); loc_save(&qerr->loc); QINCREF(err->obj); qerr->error = err->obj; for (i = 0; qerror_table[i].error_fmt; i++) { if (strcmp(qerror_table[i].error_fmt, err->fmt) == 0) { qerr->entry = &qerror_table[i]; break; } } if (monitor_cur_is_qmp()) { monitor_set_error(cur_mon, qerr); } else { qerror_print(qerr); QDECREF(qerr); } } /** * qobject_to_qerror(): Convert a QObject into a QError */ QError *qobject_to_qerror(const QObject *obj) { if (qobject_type(obj) != QTYPE_QERROR) { return NULL; } return container_of(obj, QError, base); } /** * qerror_destroy_obj(): Free all memory allocated by a QError */ static void qerror_destroy_obj(QObject *obj) { QError *qerr; assert(obj != NULL); qerr = qobject_to_qerror(obj); QDECREF(qerr->error); g_free(qerr); }