731 lines
32 KiB
C
731 lines
32 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include "sd-bus.h"
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#include "alloc-util.h"
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#include "busctl-introspect.h"
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#include "path-util.h"
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#include "string-util.h"
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#include "util.h"
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#include "xml.h"
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#define NODE_DEPTH_MAX 16
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typedef struct Context {
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const XMLIntrospectOps *ops;
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void *userdata;
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char *interface_name;
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uint64_t interface_flags;
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char *member_name;
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char *member_signature;
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char *member_result;
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uint64_t member_flags;
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bool member_writable;
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const char *current;
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void *xml_state;
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} Context;
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static void context_reset_member(Context *c) {
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free(c->member_name);
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free(c->member_signature);
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free(c->member_result);
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c->member_name = c->member_signature = c->member_result = NULL;
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c->member_flags = 0;
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c->member_writable = false;
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}
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static void context_reset_interface(Context *c) {
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c->interface_name = mfree(c->interface_name);
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c->interface_flags = 0;
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context_reset_member(c);
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}
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static int parse_xml_annotation(Context *context, uint64_t *flags) {
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enum {
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STATE_ANNOTATION,
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STATE_NAME,
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STATE_VALUE
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} state = STATE_ANNOTATION;
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_cleanup_free_ char *field = NULL, *value = NULL;
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assert(context);
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for (;;) {
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_cleanup_free_ char *name = NULL;
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int t;
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t = xml_tokenize(&context->current, &name, &context->xml_state, NULL);
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if (t < 0) {
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log_error("XML parse error.");
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return t;
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}
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if (t == XML_END)
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return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
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"Premature end of XML data.");
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switch (state) {
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case STATE_ANNOTATION:
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if (t == XML_ATTRIBUTE_NAME) {
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if (streq_ptr(name, "name"))
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state = STATE_NAME;
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else if (streq_ptr(name, "value"))
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state = STATE_VALUE;
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else
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return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
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"Unexpected <annotation> attribute %s.",
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name);
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} else if (t == XML_TAG_CLOSE_EMPTY ||
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(t == XML_TAG_CLOSE && streq_ptr(name, "annotation"))) {
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if (flags) {
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if (streq_ptr(field, "org.freedesktop.DBus.Deprecated")) {
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if (streq_ptr(value, "true"))
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*flags |= SD_BUS_VTABLE_DEPRECATED;
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} else if (streq_ptr(field, "org.freedesktop.DBus.Method.NoReply")) {
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if (streq_ptr(value, "true"))
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*flags |= SD_BUS_VTABLE_METHOD_NO_REPLY;
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} else if (streq_ptr(field, "org.freedesktop.DBus.Property.EmitsChangedSignal")) {
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if (streq_ptr(value, "const"))
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*flags = (*flags & ~(SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION|SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE)) | SD_BUS_VTABLE_PROPERTY_CONST;
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else if (streq_ptr(value, "invalidates"))
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*flags = (*flags & ~(SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE|SD_BUS_VTABLE_PROPERTY_CONST)) | SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION;
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else if (streq_ptr(value, "false"))
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*flags = *flags & ~(SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE|SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION);
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}
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}
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return 0;
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} else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected token in <annotation>. (1)");
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break;
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case STATE_NAME:
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if (t == XML_ATTRIBUTE_VALUE) {
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free_and_replace(field, name);
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state = STATE_ANNOTATION;
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} else
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected token in <annotation>. (2)");
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break;
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case STATE_VALUE:
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if (t == XML_ATTRIBUTE_VALUE) {
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free_and_replace(value, name);
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state = STATE_ANNOTATION;
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} else
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected token in <annotation>. (3)");
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break;
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default:
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assert_not_reached("Bad state");
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}
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}
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}
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static int parse_xml_node(Context *context, const char *prefix, unsigned n_depth) {
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enum {
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STATE_NODE,
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STATE_NODE_NAME,
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STATE_INTERFACE,
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STATE_INTERFACE_NAME,
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STATE_METHOD,
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STATE_METHOD_NAME,
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STATE_METHOD_ARG,
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STATE_METHOD_ARG_NAME,
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STATE_METHOD_ARG_TYPE,
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STATE_METHOD_ARG_DIRECTION,
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STATE_SIGNAL,
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STATE_SIGNAL_NAME,
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STATE_SIGNAL_ARG,
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STATE_SIGNAL_ARG_NAME,
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STATE_SIGNAL_ARG_TYPE,
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STATE_SIGNAL_ARG_DIRECTION,
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STATE_PROPERTY,
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STATE_PROPERTY_NAME,
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STATE_PROPERTY_TYPE,
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STATE_PROPERTY_ACCESS,
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} state = STATE_NODE;
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_cleanup_free_ char *node_path = NULL, *argument_type = NULL, *argument_direction = NULL;
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const char *np = prefix;
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int r;
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assert(context);
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assert(prefix);
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if (n_depth > NODE_DEPTH_MAX)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "<node> depth too high.");
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for (;;) {
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_cleanup_free_ char *name = NULL;
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int t;
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t = xml_tokenize(&context->current, &name, &context->xml_state, NULL);
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if (t < 0) {
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log_error("XML parse error.");
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return t;
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}
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if (t == XML_END)
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return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), "Premature end of XML data.");
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switch (state) {
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case STATE_NODE:
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if (t == XML_ATTRIBUTE_NAME) {
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if (streq_ptr(name, "name"))
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state = STATE_NODE_NAME;
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else
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return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
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"Unexpected <node> attribute %s.", name);
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} else if (t == XML_TAG_OPEN) {
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if (streq_ptr(name, "interface"))
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state = STATE_INTERFACE;
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else if (streq_ptr(name, "node")) {
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r = parse_xml_node(context, np, n_depth+1);
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if (r < 0)
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return r;
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} else
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return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
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"Unexpected <node> tag %s.", name);
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} else if (t == XML_TAG_CLOSE_EMPTY ||
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(t == XML_TAG_CLOSE && streq_ptr(name, "node"))) {
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if (context->ops->on_path) {
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r = context->ops->on_path(node_path ? node_path : np, context->userdata);
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if (r < 0)
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return r;
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}
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return 0;
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} else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected token in <node>. (1)");
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break;
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case STATE_NODE_NAME:
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if (t == XML_ATTRIBUTE_VALUE) {
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free(node_path);
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if (name[0] == '/')
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node_path = TAKE_PTR(name);
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else {
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node_path = path_join(prefix, name);
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if (!node_path)
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return log_oom();
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}
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np = node_path;
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state = STATE_NODE;
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} else
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected token in <node>. (2)");
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break;
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case STATE_INTERFACE:
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if (t == XML_ATTRIBUTE_NAME) {
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if (streq_ptr(name, "name"))
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state = STATE_INTERFACE_NAME;
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else
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return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
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"Unexpected <interface> attribute %s.",
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name);
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} else if (t == XML_TAG_OPEN) {
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if (streq_ptr(name, "method"))
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state = STATE_METHOD;
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else if (streq_ptr(name, "signal"))
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state = STATE_SIGNAL;
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else if (streq_ptr(name, "property")) {
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context->member_flags |= SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE;
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state = STATE_PROPERTY;
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} else if (streq_ptr(name, "annotation")) {
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r = parse_xml_annotation(context, &context->interface_flags);
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if (r < 0)
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return r;
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} else
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected <interface> tag %s.", name);
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} else if (t == XML_TAG_CLOSE_EMPTY ||
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(t == XML_TAG_CLOSE && streq_ptr(name, "interface"))) {
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if (n_depth == 0) {
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if (context->ops->on_interface) {
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r = context->ops->on_interface(context->interface_name, context->interface_flags, context->userdata);
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if (r < 0)
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return r;
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}
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context_reset_interface(context);
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}
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state = STATE_NODE;
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} else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected token in <interface>. (1)");
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break;
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case STATE_INTERFACE_NAME:
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if (t == XML_ATTRIBUTE_VALUE) {
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if (n_depth == 0)
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free_and_replace(context->interface_name, name);
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state = STATE_INTERFACE;
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} else
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected token in <interface>. (2)");
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break;
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case STATE_METHOD:
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if (t == XML_ATTRIBUTE_NAME) {
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if (streq_ptr(name, "name"))
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state = STATE_METHOD_NAME;
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else
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return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
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"Unexpected <method> attribute %s",
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name);
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} else if (t == XML_TAG_OPEN) {
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if (streq_ptr(name, "arg"))
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state = STATE_METHOD_ARG;
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else if (streq_ptr(name, "annotation")) {
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r = parse_xml_annotation(context, &context->member_flags);
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if (r < 0)
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return r;
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} else
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected <method> tag %s.",
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name);
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} else if (t == XML_TAG_CLOSE_EMPTY ||
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(t == XML_TAG_CLOSE && streq_ptr(name, "method"))) {
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if (n_depth == 0) {
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if (context->ops->on_method) {
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r = context->ops->on_method(context->interface_name, context->member_name, context->member_signature, context->member_result, context->member_flags, context->userdata);
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if (r < 0)
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return r;
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}
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context_reset_member(context);
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}
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state = STATE_INTERFACE;
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} else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected token in <method> (1).");
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break;
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case STATE_METHOD_NAME:
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if (t == XML_ATTRIBUTE_VALUE) {
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if (n_depth == 0)
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free_and_replace(context->member_name, name);
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state = STATE_METHOD;
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} else
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected token in <method> (2).");
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break;
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case STATE_METHOD_ARG:
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if (t == XML_ATTRIBUTE_NAME) {
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if (streq_ptr(name, "name"))
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state = STATE_METHOD_ARG_NAME;
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else if (streq_ptr(name, "type"))
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state = STATE_METHOD_ARG_TYPE;
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else if (streq_ptr(name, "direction"))
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state = STATE_METHOD_ARG_DIRECTION;
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else
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return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
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"Unexpected method <arg> attribute %s.",
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name);
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} else if (t == XML_TAG_OPEN) {
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if (streq_ptr(name, "annotation")) {
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r = parse_xml_annotation(context, NULL);
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if (r < 0)
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return r;
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} else
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected method <arg> tag %s.",
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name);
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} else if (t == XML_TAG_CLOSE_EMPTY ||
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(t == XML_TAG_CLOSE && streq_ptr(name, "arg"))) {
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if (n_depth == 0) {
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if (argument_type) {
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if (!argument_direction || streq(argument_direction, "in")) {
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if (!strextend(&context->member_signature, argument_type))
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return log_oom();
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} else if (streq(argument_direction, "out")) {
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if (!strextend(&context->member_result, argument_type))
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return log_oom();
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} else
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log_error("Unexpected method <arg> direction value '%s'.", argument_direction);
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}
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argument_type = mfree(argument_type);
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argument_direction = mfree(argument_direction);
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}
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state = STATE_METHOD;
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} else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected token in method <arg>. (1)");
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break;
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case STATE_METHOD_ARG_NAME:
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if (t == XML_ATTRIBUTE_VALUE)
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state = STATE_METHOD_ARG;
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else
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected token in method <arg>. (2)");
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break;
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case STATE_METHOD_ARG_TYPE:
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if (t == XML_ATTRIBUTE_VALUE) {
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free_and_replace(argument_type, name);
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state = STATE_METHOD_ARG;
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} else
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected token in method <arg>. (3)");
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break;
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case STATE_METHOD_ARG_DIRECTION:
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if (t == XML_ATTRIBUTE_VALUE) {
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free_and_replace(argument_direction, name);
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state = STATE_METHOD_ARG;
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} else
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected token in method <arg>. (4)");
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break;
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case STATE_SIGNAL:
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if (t == XML_ATTRIBUTE_NAME) {
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if (streq_ptr(name, "name"))
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state = STATE_SIGNAL_NAME;
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else
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return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
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"Unexpected <signal> attribute %s.",
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name);
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} else if (t == XML_TAG_OPEN) {
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if (streq_ptr(name, "arg"))
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state = STATE_SIGNAL_ARG;
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else if (streq_ptr(name, "annotation")) {
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r = parse_xml_annotation(context, &context->member_flags);
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if (r < 0)
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return r;
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} else
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected <signal> tag %s.",
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name);
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} else if (t == XML_TAG_CLOSE_EMPTY ||
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(t == XML_TAG_CLOSE && streq_ptr(name, "signal"))) {
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|
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if (n_depth == 0) {
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if (context->ops->on_signal) {
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r = context->ops->on_signal(context->interface_name, context->member_name, context->member_signature, context->member_flags, context->userdata);
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if (r < 0)
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return r;
|
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}
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context_reset_member(context);
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}
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|
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state = STATE_INTERFACE;
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} else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected token in <signal>. (1)");
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break;
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|
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case STATE_SIGNAL_NAME:
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|
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if (t == XML_ATTRIBUTE_VALUE) {
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if (n_depth == 0)
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free_and_replace(context->member_name, name);
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state = STATE_SIGNAL;
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} else
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Unexpected token in <signal>. (2)");
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break;
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case STATE_SIGNAL_ARG:
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if (t == XML_ATTRIBUTE_NAME) {
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if (streq_ptr(name, "name"))
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state = STATE_SIGNAL_ARG_NAME;
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else if (streq_ptr(name, "type"))
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state = STATE_SIGNAL_ARG_TYPE;
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else if (streq_ptr(name, "direction"))
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state = STATE_SIGNAL_ARG_DIRECTION;
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else
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return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
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"Unexpected signal <arg> attribute %s.",
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name);
|
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} else if (t == XML_TAG_OPEN) {
|
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if (streq_ptr(name, "annotation")) {
|
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r = parse_xml_annotation(context, NULL);
|
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if (r < 0)
|
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return r;
|
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} else
|
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"Unexpected signal <arg> tag %s.",
|
|
name);
|
|
} else if (t == XML_TAG_CLOSE_EMPTY ||
|
|
(t == XML_TAG_CLOSE && streq_ptr(name, "arg"))) {
|
|
|
|
if (argument_type) {
|
|
if (!argument_direction || streq(argument_direction, "out")) {
|
|
if (!strextend(&context->member_signature, argument_type))
|
|
return log_oom();
|
|
} else
|
|
log_error("Unexpected signal <arg> direction value '%s'.", argument_direction);
|
|
|
|
argument_type = mfree(argument_type);
|
|
}
|
|
|
|
state = STATE_SIGNAL;
|
|
} else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"Unexpected token in signal <arg> (1).");
|
|
|
|
break;
|
|
|
|
case STATE_SIGNAL_ARG_NAME:
|
|
|
|
if (t == XML_ATTRIBUTE_VALUE)
|
|
state = STATE_SIGNAL_ARG;
|
|
else
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"Unexpected token in signal <arg> (2).");
|
|
|
|
break;
|
|
|
|
case STATE_SIGNAL_ARG_TYPE:
|
|
|
|
if (t == XML_ATTRIBUTE_VALUE) {
|
|
free_and_replace(argument_type, name);
|
|
|
|
state = STATE_SIGNAL_ARG;
|
|
} else
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"Unexpected token in signal <arg> (3).");
|
|
|
|
break;
|
|
|
|
case STATE_SIGNAL_ARG_DIRECTION:
|
|
|
|
if (t == XML_ATTRIBUTE_VALUE) {
|
|
free_and_replace(argument_direction, name);
|
|
|
|
state = STATE_SIGNAL_ARG;
|
|
} else
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"Unexpected token in signal <arg>. (4)");
|
|
|
|
break;
|
|
|
|
case STATE_PROPERTY:
|
|
|
|
if (t == XML_ATTRIBUTE_NAME) {
|
|
if (streq_ptr(name, "name"))
|
|
state = STATE_PROPERTY_NAME;
|
|
else if (streq_ptr(name, "type"))
|
|
state = STATE_PROPERTY_TYPE;
|
|
else if (streq_ptr(name, "access"))
|
|
state = STATE_PROPERTY_ACCESS;
|
|
else
|
|
return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
|
|
"Unexpected <property> attribute %s.",
|
|
name);
|
|
} else if (t == XML_TAG_OPEN) {
|
|
|
|
if (streq_ptr(name, "annotation")) {
|
|
r = parse_xml_annotation(context, &context->member_flags);
|
|
if (r < 0)
|
|
return r;
|
|
} else
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"Unexpected <property> tag %s.",
|
|
name);
|
|
|
|
} else if (t == XML_TAG_CLOSE_EMPTY ||
|
|
(t == XML_TAG_CLOSE && streq_ptr(name, "property"))) {
|
|
|
|
if (n_depth == 0) {
|
|
if (context->ops->on_property) {
|
|
r = context->ops->on_property(context->interface_name, context->member_name, context->member_signature, context->member_writable, context->member_flags, context->userdata);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
context_reset_member(context);
|
|
}
|
|
|
|
state = STATE_INTERFACE;
|
|
|
|
} else if (t != XML_TEXT || !in_charset(name, WHITESPACE))
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"Unexpected token in <property>. (1)");
|
|
|
|
break;
|
|
|
|
case STATE_PROPERTY_NAME:
|
|
|
|
if (t == XML_ATTRIBUTE_VALUE) {
|
|
if (n_depth == 0)
|
|
free_and_replace(context->member_name, name);
|
|
|
|
state = STATE_PROPERTY;
|
|
} else
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"Unexpected token in <property>. (2)");
|
|
|
|
break;
|
|
|
|
case STATE_PROPERTY_TYPE:
|
|
|
|
if (t == XML_ATTRIBUTE_VALUE) {
|
|
if (n_depth == 0)
|
|
free_and_replace(context->member_signature, name);
|
|
|
|
state = STATE_PROPERTY;
|
|
} else
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"Unexpected token in <property>. (3)");
|
|
|
|
break;
|
|
|
|
case STATE_PROPERTY_ACCESS:
|
|
|
|
if (t == XML_ATTRIBUTE_VALUE) {
|
|
|
|
if (streq(name, "readwrite") || streq(name, "write"))
|
|
context->member_writable = true;
|
|
|
|
state = STATE_PROPERTY;
|
|
} else
|
|
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
|
|
"Unexpected token in <property>. (4)");
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
int parse_xml_introspect(const char *prefix, const char *xml, const XMLIntrospectOps *ops, void *userdata) {
|
|
Context context = {
|
|
.ops = ops,
|
|
.userdata = userdata,
|
|
.current = xml,
|
|
};
|
|
|
|
int r;
|
|
|
|
assert(prefix);
|
|
assert(xml);
|
|
assert(ops);
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *name = NULL;
|
|
|
|
r = xml_tokenize(&context.current, &name, &context.xml_state, NULL);
|
|
if (r < 0) {
|
|
log_error("XML parse error");
|
|
goto finish;
|
|
}
|
|
|
|
if (r == XML_END) {
|
|
r = 0;
|
|
break;
|
|
}
|
|
|
|
if (r == XML_TAG_OPEN) {
|
|
|
|
if (streq(name, "node")) {
|
|
r = parse_xml_node(&context, prefix, 0);
|
|
if (r < 0)
|
|
goto finish;
|
|
} else {
|
|
log_error("Unexpected tag '%s' in introspection data.", name);
|
|
r = -EBADMSG;
|
|
goto finish;
|
|
}
|
|
} else if (r != XML_TEXT || !in_charset(name, WHITESPACE)) {
|
|
log_error("Unexpected token.");
|
|
r = -EBADMSG;
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
finish:
|
|
context_reset_interface(&context);
|
|
|
|
return r;
|
|
}
|