2022-12-21 00:38:10 +02:00
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#include <string.h>
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#include <stdio.h>
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#include "try.h"
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#include "wire.h"
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2022-12-26 20:28:56 +02:00
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#define WIRE_ENABLE_VERBOSE 0
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#if WIRE_ENABLE_VERBOSE
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#define WIRE_VERBOSE printf
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#else
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#define WIRE_VERBOSE(...)
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#endif
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2022-12-21 00:38:10 +02:00
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bool wire_align(wire_context_t *c, uint32_t alignment)
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{
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if ((c->byte_cursor % alignment) == 0) {
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return true;
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}
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uint32_t new_cursor = c->byte_cursor + alignment - (c->byte_cursor % alignment);
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if (new_cursor >= c->data_len || new_cursor < c->byte_cursor) {
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return false;
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}
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c->byte_cursor = new_cursor;
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return true;
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}
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bool wire_write_align(wire_context_t *c, uint32_t alignment)
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{
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if ((c->byte_cursor % alignment) == 0) {
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return true;
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}
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uint32_t new_cursor = c->byte_cursor + alignment - (c->byte_cursor % alignment);
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if (new_cursor >= c->data_len || new_cursor < c->byte_cursor) {
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return false;
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}
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while (c->byte_cursor < new_cursor) {
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c->data[c->byte_cursor] = '\0';
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c->byte_cursor++;
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}
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return true;
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}
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// SPEC: https://dbus.freedesktop.org/doc/dbus-specification.html#id-1.4.6
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_WIRE_DEF_BYTE_TYPE(i8, int8_t);
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_WIRE_DEF_BYTE_TYPE(u8, uint8_t);
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_WIRE_DEF_TYPE(i16, int16_t, 2);
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_WIRE_DEF_TYPE(u16, uint16_t, 2);
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_WIRE_DEF_TYPE(i32, int32_t, 4);
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_WIRE_DEF_TYPE(u32, uint32_t, 4);
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_WIRE_DEF_TYPE(boolean, uint32_t, 4);
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char *wire_get_string(wire_context_t *c, uint32_t *out_len)
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{
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2022-12-25 20:54:10 +02:00
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uint32_t len = *(uint32_t*)TRYPTR_NIL(wire_get_u32(c));
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2022-12-21 00:38:10 +02:00
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if (out_len) {
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*out_len = len;
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}
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uint32_t new_cursor = c->byte_cursor + len + 1; /* + 1 because of the extra null termination that strings have */
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if (new_cursor >= c->data_len) {
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return NULL;
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}
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char *str = (char *)&c->data[c->byte_cursor];
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c->byte_cursor = new_cursor;
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return str;
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}
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char *wire_set_string(wire_context_t *c, const char *str)
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{
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uint32_t len = strlen(str);
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2022-12-25 20:54:10 +02:00
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TRYPTR_NIL(wire_set_u32(c, len));
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2022-12-21 00:38:10 +02:00
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uint32_t new_cursor = c->byte_cursor + len + 1; /* + 1 because of the extra null termination that strings have */
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if (new_cursor >= c->data_len) {
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return NULL;
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}
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// TODO?
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char *dest = (char*)&c->data[c->byte_cursor];
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memcpy(dest, str, len + 1);
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c->byte_cursor = new_cursor;
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return dest;
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}
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char *wire_get_signature(wire_context_t *c, uint8_t *out_len)
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{
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2022-12-25 20:54:10 +02:00
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uint8_t len = *(uint8_t*)TRYPTR_NIL(wire_get_u8(c));
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2022-12-21 00:38:10 +02:00
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if (out_len) {
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*out_len = len;
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}
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uint32_t new_cursor = c->byte_cursor + len + 1; /* + 1 because of the extra null termination that strings have */
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if (new_cursor >= c->data_len) {
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return NULL;
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}
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char *str = (char *)&c->data[c->byte_cursor];
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c->byte_cursor = new_cursor;
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return str;
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}
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char *wire_set_signature(wire_context_t *c, const char *str)
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{
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uint8_t len = strlen(str);
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2022-12-25 20:54:10 +02:00
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TRYPTR_NIL(wire_set_u8(c, len));
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2022-12-21 00:38:10 +02:00
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uint32_t new_cursor = c->byte_cursor + len + 1; /* + 1 because of the extra null termination that strings have */
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if (new_cursor >= c->data_len) {
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return NULL;
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}
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// TODO?
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char *dest = (char*)&c->data[c->byte_cursor];
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memcpy(dest, str, len + 1);
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c->byte_cursor = new_cursor;
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return dest;
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}
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int wire_parse_message(wire_context_t *c, wire_message_t *msg)
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{
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// SPEC: https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-messages
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2022-12-25 20:54:10 +02:00
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msg->endianness = *(uint8_t*)TRYPTR(wire_get_u8(c));
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2022-12-26 20:31:12 +02:00
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if (msg->endianness == 'B') {
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// we only support little endian
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return -1;
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}
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2022-12-25 20:54:10 +02:00
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msg->type = *(uint8_t*)TRYPTR(wire_get_u8(c));
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msg->flags = *(uint8_t*)TRYPTR(wire_get_u8(c));
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msg->protocol_version = *(uint8_t*)TRYPTR(wire_get_u8(c));
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msg->body_length = *(uint32_t*)TRYPTR(wire_get_u32(c));
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msg->serial = *(uint32_t*)TRYPTR(wire_get_u32(c));
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msg->header_fields_length = *(uint32_t*)TRYPTR(wire_get_u32(c));
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2022-12-21 00:38:10 +02:00
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size_t header_fields_end = c->byte_cursor + msg->header_fields_length;
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2022-12-26 20:28:56 +02:00
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WIRE_VERBOSE("start parse message: type=%d\n", msg->type);
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2022-12-26 18:05:12 +02:00
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2022-12-21 00:38:10 +02:00
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while (c->byte_cursor < header_fields_end) {
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2022-12-25 20:54:10 +02:00
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uint8_t field_code = *(uint8_t*)TRYPTR(wire_get_u8(c));
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TRYPTR(wire_get_signature(c, NULL));
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2022-12-21 00:38:10 +02:00
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switch (field_code) {
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2022-12-23 23:58:18 +02:00
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case DBUS_HEADER_FIELD_PATH: /* through */
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case DBUS_HEADER_FIELD_INTERFACE: /* through */
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case DBUS_HEADER_FIELD_MEMBER: /* through */
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2022-12-21 00:38:10 +02:00
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case DBUS_HEADER_FIELD_DESTINATION: {
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2022-12-25 20:54:10 +02:00
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char *str = TRYPTR(wire_get_string(c, NULL));
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2022-12-26 20:28:56 +02:00
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WIRE_VERBOSE("field: %s\n", str);
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2022-12-23 23:58:18 +02:00
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msg->fields[field_code].t.str = str;
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2022-12-21 00:38:10 +02:00
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} break;
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2022-12-21 21:38:48 +02:00
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case DBUS_HEADER_FIELD_SIGNATURE: {
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2022-12-25 20:54:10 +02:00
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char *str = TRYPTR(wire_get_signature(c, NULL));
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2022-12-26 20:28:56 +02:00
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WIRE_VERBOSE("field: %s\n", str);
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2022-12-23 23:58:18 +02:00
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msg->fields[field_code].t.str = str;
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} break;
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case DBUS_HEADER_FIELD_REPLY_SERIAL: {
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2022-12-25 20:54:10 +02:00
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uint32_t u = *(uint32_t*)TRYPTR(wire_get_u32(c));
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2022-12-26 20:28:56 +02:00
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WIRE_VERBOSE("field: %d\n", u);
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2022-12-23 23:58:18 +02:00
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msg->fields[field_code].t.u32 = u;
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2022-12-21 21:38:48 +02:00
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} break;
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2022-12-21 00:38:10 +02:00
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default: {
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printf("header: unknown field: %d\n", field_code);
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return -1;
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} break;
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}
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2022-12-23 23:58:18 +02:00
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msg->fields[field_code].present = true;
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2022-12-21 00:38:10 +02:00
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// Structs are always aligned to `8`.
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// SPEC: https://dbus.freedesktop.org/doc/dbus-specification.html#id-1.4.6
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_align(c, 8));
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2022-12-21 00:38:10 +02:00
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if (msg->header_fields_count++ > WIRE_MESSAGE_MAX_HEADER_FIELDS) {
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return -1;
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}
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}
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2022-12-26 20:28:56 +02:00
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WIRE_VERBOSE("end parse message\n");
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2022-12-26 18:05:12 +02:00
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2022-12-21 21:38:48 +02:00
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/* header ends at 8 byte boundry */
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_align(c, 8));
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2022-12-21 21:38:48 +02:00
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2022-12-21 00:38:10 +02:00
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return 0;
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}
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int wire_compose_reply(wire_context_t *c, wire_message_t *msg, const char *signature, uint32_t **out_body_length)
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{
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u8(c, msg->endianness)); /* endianness */
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TRYPTR(wire_set_u8(c, DBUS_MESSAGE_METHOD_RETURN)); /* type */
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TRYPTR(wire_set_u8(c, 0)); /* flags */
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TRYPTR(wire_set_u8(c, DBUS_PROTOCOL_VERSION)); /* protocol_version */
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uint32_t *body_length = TRYPTR(wire_set_u32(c, 0)); /* body length */
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TRYPTR(wire_set_u32(c, msg->serial+1)); /* serial */
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uint32_t *header_fields_length = TRYPTR(wire_set_u32(c, 0)); /* header_fields_length */
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2022-12-21 00:38:10 +02:00
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uint32_t header_fields_start = c->byte_cursor;
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/* header fields */
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{
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/* SIGNATURE */
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{
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/* byte (field code) */
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u8(c, DBUS_HEADER_FIELD_SIGNATURE));
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2022-12-21 00:38:10 +02:00
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/* variant */
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/* signature */
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_signature(c, "g"));
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2022-12-21 00:38:10 +02:00
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/* signature */
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_signature(c, signature));
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2022-12-21 00:38:10 +02:00
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// need to align to 8 byte boundry after each array element?
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_write_align(c, 8));
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2022-12-21 00:38:10 +02:00
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}
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/* REPLY_SERIAL */
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{
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/* byte (field code) */
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u8(c, DBUS_HEADER_FIELD_REPLY_SERIAL));
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2022-12-21 00:38:10 +02:00
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/* variant */
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/* signature */
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_signature(c, "u"));
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2022-12-21 00:38:10 +02:00
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/* reply serial */
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u32(c, msg->serial));
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2022-12-21 00:38:10 +02:00
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}
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}
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*header_fields_length = c->byte_cursor - header_fields_start;
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// header ends on an 8 byte alignment
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_write_align(c, 8));
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2022-12-21 00:38:10 +02:00
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if (out_body_length) {
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*out_body_length = body_length;
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}
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return 0;
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}
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2022-12-21 21:38:48 +02:00
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int wire_compose_error(wire_context_t *c, wire_message_t *msg, const char *error_name)
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{
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u8(c, msg->endianness)); /* endianness */
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TRYPTR(wire_set_u8(c, DBUS_MESSAGE_ERROR)); /* type */
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TRYPTR(wire_set_u8(c, 0)); /* flags */
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TRYPTR(wire_set_u8(c, DBUS_PROTOCOL_VERSION)); /* protocol_version */
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TRYPTR(wire_set_u32(c, 0)); /* body length */
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TRYPTR(wire_set_u32(c, msg->serial+1)); /* serial */
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uint32_t *header_fields_length = TRYPTR(wire_set_u32(c, 0)); /* header_fields_length */
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2022-12-21 21:38:48 +02:00
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uint32_t header_fields_start = c->byte_cursor;
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/* header fields */
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{
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/* ERROR_NAME */
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{
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/* byte (field code) */
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u8(c, DBUS_HEADER_FIELD_ERROR_NAME));
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2022-12-21 21:38:48 +02:00
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/* variant */
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/* signature */
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_signature(c, "s"));
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2022-12-21 21:38:48 +02:00
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/* string */
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_string(c, error_name));
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2022-12-21 21:38:48 +02:00
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// need to align to 8 byte boundry after each array element?
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_write_align(c, 8));
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2022-12-21 21:38:48 +02:00
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}
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/* REPLY_SERIAL */
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{
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/* byte (field code) */
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u8(c, DBUS_HEADER_FIELD_REPLY_SERIAL));
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2022-12-21 21:38:48 +02:00
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/* variant */
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/* signature */
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_signature(c, "u"));
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2022-12-21 21:38:48 +02:00
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/* reply serial */
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u32(c, msg->serial));
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2022-12-21 21:38:48 +02:00
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}
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}
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*header_fields_length = c->byte_cursor - header_fields_start;
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// header ends on an 8 byte alignment
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_write_align(c, 8));
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2022-12-21 21:38:48 +02:00
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return 0;
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}
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2022-12-23 23:58:18 +02:00
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int wire_compose_unicast_reply(wire_context_t *c, wire_context_t *msg_c, wire_message_t *msg, char *sender_unique_name)
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{
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u8(c, msg->endianness)); /* endianness */
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TRYPTR(wire_set_u8(c, msg->type)); /* type */
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TRYPTR(wire_set_u8(c, 0)); /* flags */
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TRYPTR(wire_set_u8(c, DBUS_PROTOCOL_VERSION)); /* protocol_version */
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TRYPTR(wire_set_u32(c, msg->body_length)); /* body length */
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TRYPTR(wire_set_u32(c, msg->serial)); /* serial */
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uint32_t *header_fields_length = TRYPTR(wire_set_u32(c, 0)); /* header_fields_length */
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2022-12-23 23:58:18 +02:00
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uint32_t header_fields_start = c->byte_cursor;
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switch (msg->type) {
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case DBUS_MESSAGE_METHOD_CALL: {
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// these fields are required for DBUS_MESSAGE_METHOD_CALL, so we must (hackily) check for their presence
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// interface is not strictly required by the spec, however we require it here anyways
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wire_message_field_t *path_field = &msg->fields[DBUS_HEADER_FIELD_PATH];
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wire_message_field_t *interface_field = &msg->fields[DBUS_HEADER_FIELD_INTERFACE];
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wire_message_field_t *member_field = &msg->fields[DBUS_HEADER_FIELD_MEMBER];
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wire_message_field_t *signature_field = &msg->fields[DBUS_HEADER_FIELD_SIGNATURE];
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if (!path_field->present || !interface_field->present || !interface_field->present) {
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return -1;
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}
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u8(c, DBUS_HEADER_FIELD_PATH));
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TRYPTR(wire_set_signature(c, "o"));
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TRYPTR(wire_set_string(c, path_field->t.str));
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TRYPTR(wire_write_align(c, 8));
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2022-12-23 23:58:18 +02:00
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u8(c, DBUS_HEADER_FIELD_INTERFACE));
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TRYPTR(wire_set_signature(c, "s"));
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TRYPTR(wire_set_string(c, interface_field->t.str));
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TRYPTR(wire_write_align(c, 8));
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2022-12-23 23:58:18 +02:00
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u8(c, DBUS_HEADER_FIELD_MEMBER));
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TRYPTR(wire_set_signature(c, "s"));
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TRYPTR(wire_set_string(c, member_field->t.str));
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TRYPTR(wire_write_align(c, 8));
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2022-12-23 23:58:18 +02:00
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if (signature_field->present) {
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u8(c, DBUS_HEADER_FIELD_SIGNATURE));
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TRYPTR(wire_set_signature(c, "g"));
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TRYPTR(wire_set_signature(c, signature_field->t.str));
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TRYPTR(wire_write_align(c, 8));
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2022-12-23 23:58:18 +02:00
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}
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u8(c, DBUS_HEADER_FIELD_SENDER));
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TRYPTR(wire_set_signature(c, "s"));
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TRYPTR(wire_set_string(c, sender_unique_name));
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2022-12-23 23:58:18 +02:00
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// last element, don't align
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} break;
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case DBUS_MESSAGE_METHOD_RETURN: {
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wire_message_field_t *reply_serial_field = &msg->fields[DBUS_HEADER_FIELD_REPLY_SERIAL];
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if (!reply_serial_field->present) {
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return -1;
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}
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u8(c, DBUS_HEADER_FIELD_REPLY_SERIAL));
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TRYPTR(wire_set_signature(c, "u"));
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TRYPTR(wire_set_u32(c, reply_serial_field->t.u32));
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TRYPTR(wire_write_align(c, 8));
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2022-12-23 23:58:18 +02:00
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wire_message_field_t *signature_field = &msg->fields[DBUS_HEADER_FIELD_SIGNATURE];
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if (signature_field->present) {
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u8(c, DBUS_HEADER_FIELD_SIGNATURE));
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TRYPTR(wire_set_signature(c, "g"));
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TRYPTR(wire_set_string(c, signature_field->t.str));
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TRYPTR(wire_write_align(c, 8));
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2022-12-23 23:58:18 +02:00
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}
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_set_u8(c, DBUS_HEADER_FIELD_SENDER));
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TRYPTR(wire_set_signature(c, "s"));
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TRYPTR(wire_set_string(c, sender_unique_name));
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2022-12-23 23:58:18 +02:00
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// last element, don't align
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} break;
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default: {
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return -1;
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} break;
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}
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*header_fields_length = c->byte_cursor - header_fields_start;
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// header ends on an 8 byte alignment
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2022-12-25 20:54:10 +02:00
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TRYPTR(wire_write_align(c, 8));
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2022-12-23 23:58:18 +02:00
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if (c->byte_cursor + msg->body_length > c->data_len) {
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return -1;
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}
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memcpy(&c->data[c->byte_cursor], &msg_c->data[msg_c->byte_cursor], msg->body_length);
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c->byte_cursor += msg->body_length;
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return 0;
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}
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