diff options
Diffstat (limited to 'src/busctl/busctl-introspect.c')
| -rw-r--r-- | src/busctl/busctl-introspect.c | 732 |
1 files changed, 732 insertions, 0 deletions
diff --git a/src/busctl/busctl-introspect.c b/src/busctl/busctl-introspect.c new file mode 100644 index 0000000..18254ef --- /dev/null +++ b/src/busctl/busctl-introspect.c @@ -0,0 +1,732 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ + +#include "sd-bus.h" + +#include "alloc-util.h" +#include "busctl-introspect.h" +#include "string-util.h" +#include "util.h" +#include "xml.h" + +#define NODE_DEPTH_MAX 16 + +typedef struct Context { + const XMLIntrospectOps *ops; + void *userdata; + + char *interface_name; + uint64_t interface_flags; + + char *member_name; + char *member_signature; + char *member_result; + uint64_t member_flags; + bool member_writable; + + const char *current; + void *xml_state; +} Context; + +static void context_reset_member(Context *c) { + free(c->member_name); + free(c->member_signature); + free(c->member_result); + + c->member_name = c->member_signature = c->member_result = NULL; + c->member_flags = 0; + c->member_writable = false; +} + +static void context_reset_interface(Context *c) { + c->interface_name = mfree(c->interface_name); + c->interface_flags = 0; + + context_reset_member(c); +} + +static int parse_xml_annotation(Context *context, uint64_t *flags) { + + enum { + STATE_ANNOTATION, + STATE_NAME, + STATE_VALUE + } state = STATE_ANNOTATION; + + _cleanup_free_ char *field = NULL, *value = NULL; + + assert(context); + + for (;;) { + _cleanup_free_ char *name = NULL; + + int t; + + t = xml_tokenize(&context->current, &name, &context->xml_state, NULL); + if (t < 0) { + log_error("XML parse error."); + return t; + } + + if (t == XML_END) + return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), + "Premature end of XML data."); + + switch (state) { + + case STATE_ANNOTATION: + + if (t == XML_ATTRIBUTE_NAME) { + + if (streq_ptr(name, "name")) + state = STATE_NAME; + + else if (streq_ptr(name, "value")) + state = STATE_VALUE; + + else + return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), + "Unexpected <annotation> attribute %s.", + name); + + } else if (t == XML_TAG_CLOSE_EMPTY || + (t == XML_TAG_CLOSE && streq_ptr(name, "annotation"))) { + + if (flags) { + if (streq_ptr(field, "org.freedesktop.DBus.Deprecated")) { + + if (streq_ptr(value, "true")) + *flags |= SD_BUS_VTABLE_DEPRECATED; + + } else if (streq_ptr(field, "org.freedesktop.DBus.Method.NoReply")) { + + if (streq_ptr(value, "true")) + *flags |= SD_BUS_VTABLE_METHOD_NO_REPLY; + + } else if (streq_ptr(field, "org.freedesktop.DBus.Property.EmitsChangedSignal")) { + + if (streq_ptr(value, "const")) + *flags = (*flags & ~(SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION|SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE)) | SD_BUS_VTABLE_PROPERTY_CONST; + else if (streq_ptr(value, "invalidates")) + *flags = (*flags & ~(SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE|SD_BUS_VTABLE_PROPERTY_CONST)) | SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION; + else if (streq_ptr(value, "false")) + *flags = *flags & ~(SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE|SD_BUS_VTABLE_PROPERTY_CONST|SD_BUS_VTABLE_PROPERTY_EMITS_INVALIDATION); + } + } + + return 0; + + } else if (t != XML_TEXT || !in_charset(name, WHITESPACE)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unexpected token in <annotation>. (1)"); + + break; + + case STATE_NAME: + + if (t == XML_ATTRIBUTE_VALUE) { + free_and_replace(field, name); + + state = STATE_ANNOTATION; + } else + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unexpected token in <annotation>. (2)"); + + break; + + case STATE_VALUE: + + if (t == XML_ATTRIBUTE_VALUE) { + free_and_replace(value, name); + + state = STATE_ANNOTATION; + } else + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unexpected token in <annotation>. (3)"); + + break; + + default: + assert_not_reached("Bad state"); + } + } +} + +static int parse_xml_node(Context *context, const char *prefix, unsigned n_depth) { + + enum { + STATE_NODE, + STATE_NODE_NAME, + STATE_INTERFACE, + STATE_INTERFACE_NAME, + STATE_METHOD, + STATE_METHOD_NAME, + STATE_METHOD_ARG, + STATE_METHOD_ARG_NAME, + STATE_METHOD_ARG_TYPE, + STATE_METHOD_ARG_DIRECTION, + STATE_SIGNAL, + STATE_SIGNAL_NAME, + STATE_SIGNAL_ARG, + STATE_SIGNAL_ARG_NAME, + STATE_SIGNAL_ARG_TYPE, + STATE_SIGNAL_ARG_DIRECTION, + STATE_PROPERTY, + STATE_PROPERTY_NAME, + STATE_PROPERTY_TYPE, + STATE_PROPERTY_ACCESS, + } state = STATE_NODE; + + _cleanup_free_ char *node_path = NULL, *argument_type = NULL, *argument_direction = NULL; + const char *np = prefix; + int r; + + assert(context); + assert(prefix); + + if (n_depth > NODE_DEPTH_MAX) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "<node> depth too high."); + + for (;;) { + _cleanup_free_ char *name = NULL; + int t; + + t = xml_tokenize(&context->current, &name, &context->xml_state, NULL); + if (t < 0) { + log_error("XML parse error."); + return t; + } + + if (t == XML_END) + return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), "Premature end of XML data."); + + switch (state) { + + case STATE_NODE: + if (t == XML_ATTRIBUTE_NAME) { + + if (streq_ptr(name, "name")) + state = STATE_NODE_NAME; + else + return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), + "Unexpected <node> attribute %s.", name); + + } else if (t == XML_TAG_OPEN) { + + if (streq_ptr(name, "interface")) + state = STATE_INTERFACE; + else if (streq_ptr(name, "node")) { + + r = parse_xml_node(context, np, n_depth+1); + if (r < 0) + return r; + } else + return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), + "Unexpected <node> tag %s.", name); + + } else if (t == XML_TAG_CLOSE_EMPTY || + (t == XML_TAG_CLOSE && streq_ptr(name, "node"))) { + + if (context->ops->on_path) { + r = context->ops->on_path(node_path ? node_path : np, context->userdata); + if (r < 0) + return r; + } + + return 0; + + } else if (t != XML_TEXT || !in_charset(name, WHITESPACE)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unexpected token in <node>. (1)"); + + break; + + case STATE_NODE_NAME: + + if (t == XML_ATTRIBUTE_VALUE) { + + free(node_path); + + if (name[0] == '/') + node_path = TAKE_PTR(name); + else { + + if (endswith(prefix, "/")) + node_path = strappend(prefix, name); + else + node_path = strjoin(prefix, "/", name); + if (!node_path) + return log_oom(); + } + + np = node_path; + state = STATE_NODE; + } else + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unexpected token in <node>. (2)"); + + break; + + case STATE_INTERFACE: + + if (t == XML_ATTRIBUTE_NAME) { + if (streq_ptr(name, "name")) + state = STATE_INTERFACE_NAME; + else + return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), + "Unexpected <interface> attribute %s.", + name); + + } else if (t == XML_TAG_OPEN) { + if (streq_ptr(name, "method")) + state = STATE_METHOD; + else if (streq_ptr(name, "signal")) + state = STATE_SIGNAL; + else if (streq_ptr(name, "property")) { + context->member_flags |= SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE; + state = STATE_PROPERTY; + } else if (streq_ptr(name, "annotation")) { + r = parse_xml_annotation(context, &context->interface_flags); + if (r < 0) + return r; + } else + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unexpected <interface> tag %s.", name); + } else if (t == XML_TAG_CLOSE_EMPTY || + (t == XML_TAG_CLOSE && streq_ptr(name, "interface"))) { + + if (n_depth == 0) { + if (context->ops->on_interface) { + r = context->ops->on_interface(context->interface_name, context->interface_flags, context->userdata); + if (r < 0) + return r; + } + + context_reset_interface(context); + } + + state = STATE_NODE; + + } else if (t != XML_TEXT || !in_charset(name, WHITESPACE)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unexpected token in <interface>. (1)"); + + break; + + case STATE_INTERFACE_NAME: + + if (t == XML_ATTRIBUTE_VALUE) { + if (n_depth == 0) + free_and_replace(context->interface_name, name); + + state = STATE_INTERFACE; + } else + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unexpected token in <interface>. (2)"); + + break; + + case STATE_METHOD: + + if (t == XML_ATTRIBUTE_NAME) { + if (streq_ptr(name, "name")) + state = STATE_METHOD_NAME; + else + return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), + "Unexpected <method> attribute %s", + name); + } else if (t == XML_TAG_OPEN) { + if (streq_ptr(name, "arg")) + state = STATE_METHOD_ARG; + else 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 <method> tag %s.", + name); + } else if (t == XML_TAG_CLOSE_EMPTY || + (t == XML_TAG_CLOSE && streq_ptr(name, "method"))) { + + if (n_depth == 0) { + if (context->ops->on_method) { + r = context->ops->on_method(context->interface_name, context->member_name, context->member_signature, context->member_result, 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 <method> (1)."); + + break; + + case STATE_METHOD_NAME: + + if (t == XML_ATTRIBUTE_VALUE) { + if (n_depth == 0) + free_and_replace(context->member_name, name); + + state = STATE_METHOD; + } else + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unexpected token in <method> (2)."); + + break; + + case STATE_METHOD_ARG: + + if (t == XML_ATTRIBUTE_NAME) { + if (streq_ptr(name, "name")) + state = STATE_METHOD_ARG_NAME; + else if (streq_ptr(name, "type")) + state = STATE_METHOD_ARG_TYPE; + else if (streq_ptr(name, "direction")) + state = STATE_METHOD_ARG_DIRECTION; + else + return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), + "Unexpected method <arg> attribute %s.", + name); + } else if (t == XML_TAG_OPEN) { + if (streq_ptr(name, "annotation")) { + r = parse_xml_annotation(context, NULL); + if (r < 0) + return r; + } else + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unexpected method <arg> tag %s.", + name); + } else if (t == XML_TAG_CLOSE_EMPTY || + (t == XML_TAG_CLOSE && streq_ptr(name, "arg"))) { + + if (n_depth == 0) { + + if (argument_type) { + if (!argument_direction || streq(argument_direction, "in")) { + if (!strextend(&context->member_signature, argument_type, NULL)) + return log_oom(); + } else if (streq(argument_direction, "out")) { + if (!strextend(&context->member_result, argument_type, NULL)) + return log_oom(); + } else + log_error("Unexpected method <arg> direction value '%s'.", argument_direction); + } + + argument_type = mfree(argument_type); + argument_direction = mfree(argument_direction); + } + + state = STATE_METHOD; + } else if (t != XML_TEXT || !in_charset(name, WHITESPACE)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unexpected token in method <arg>. (1)"); + + break; + + case STATE_METHOD_ARG_NAME: + + if (t == XML_ATTRIBUTE_VALUE) + state = STATE_METHOD_ARG; + else + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unexpected token in method <arg>. (2)"); + + break; + + case STATE_METHOD_ARG_TYPE: + + if (t == XML_ATTRIBUTE_VALUE) { + free_and_replace(argument_type, name); + + state = STATE_METHOD_ARG; + } else + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unexpected token in method <arg>. (3)"); + + break; + + case STATE_METHOD_ARG_DIRECTION: + + if (t == XML_ATTRIBUTE_VALUE) { + free_and_replace(argument_direction, name); + + state = STATE_METHOD_ARG; + } else + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unexpected token in method <arg>. (4)"); + + break; + + case STATE_SIGNAL: + + if (t == XML_ATTRIBUTE_NAME) { + if (streq_ptr(name, "name")) + state = STATE_SIGNAL_NAME; + else + return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), + "Unexpected <signal> attribute %s.", + name); + } else if (t == XML_TAG_OPEN) { + if (streq_ptr(name, "arg")) + state = STATE_SIGNAL_ARG; + else 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 <signal> tag %s.", + name); + } else if (t == XML_TAG_CLOSE_EMPTY || + (t == XML_TAG_CLOSE && streq_ptr(name, "signal"))) { + + if (n_depth == 0) { + if (context->ops->on_signal) { + r = context->ops->on_signal(context->interface_name, context->member_name, context->member_signature, 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 <signal>. (1)"); + + break; + + case STATE_SIGNAL_NAME: + + if (t == XML_ATTRIBUTE_VALUE) { + if (n_depth == 0) + free_and_replace(context->member_name, name); + + state = STATE_SIGNAL; + } else + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unexpected token in <signal>. (2)"); + + break; + + case STATE_SIGNAL_ARG: + + if (t == XML_ATTRIBUTE_NAME) { + if (streq_ptr(name, "name")) + state = STATE_SIGNAL_ARG_NAME; + else if (streq_ptr(name, "type")) + state = STATE_SIGNAL_ARG_TYPE; + else if (streq_ptr(name, "direction")) + state = STATE_SIGNAL_ARG_DIRECTION; + else + return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), + "Unexpected signal <arg> attribute %s.", + name); + } else if (t == XML_TAG_OPEN) { + if (streq_ptr(name, "annotation")) { + r = parse_xml_annotation(context, NULL); + if (r < 0) + return r; + } else + 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, NULL)) + 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; +} |