456 lines
12 KiB
C
456 lines
12 KiB
C
#include <stdlib.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <string.h>
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#include "eip712.h"
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#include "mem.h"
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#include "type_hash.h"
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#include "context.h"
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#include "sol_typenames.h"
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#include "field_hash.h"
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#include "path.h"
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// lib functions
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const void *get_array_in_mem(const void *ptr, uint8_t *const array_size)
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{
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*array_size = *(uint8_t*)ptr;
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return (ptr + 1);
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}
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const char *get_string_in_mem(const uint8_t *ptr, uint8_t *const string_length)
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{
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return (char*)get_array_in_mem(ptr, string_length);
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}
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// ptr must point to the beginning of a struct field
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static inline uint8_t get_struct_field_typedesc(const uint8_t *ptr)
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{
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return *ptr;
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}
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// ptr must point to the beginning of a struct field
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bool struct_field_is_array(const uint8_t *ptr)
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{
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return (get_struct_field_typedesc(ptr) & ARRAY_MASK);
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}
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// ptr must point to the beginning of a struct field
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bool struct_field_has_typesize(const uint8_t *ptr)
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{
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return (get_struct_field_typedesc(ptr) & TYPESIZE_MASK);
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}
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// ptr must point to the beginning of a struct field
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e_type struct_field_type(const uint8_t *ptr)
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{
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return (get_struct_field_typedesc(ptr) & TYPE_MASK);
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}
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// ptr must point to the beginning of a struct field
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// TODO: Extra check inside or not
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uint8_t get_struct_field_typesize(const uint8_t *ptr)
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{
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return *(ptr + 1);
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}
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// ptr must point to the beginning of a struct field
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const char *get_struct_field_custom_typename(const uint8_t *ptr,
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uint8_t *const length)
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{
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ptr += 1; // skip TypeDesc
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return get_string_in_mem(ptr, length);
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}
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// ptr must point to the beginning of a struct field
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const char *get_struct_field_typename(const uint8_t *ptr,
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uint8_t *const length)
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{
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if (struct_field_type(ptr) == TYPE_CUSTOM)
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{
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return get_struct_field_custom_typename(ptr, length);
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}
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return get_struct_field_sol_typename(ptr, length);
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}
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// ptr must point to the beginning of a depth level
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e_array_type struct_field_array_depth(const uint8_t *ptr,
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uint8_t *const array_size)
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{
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if (*ptr == ARRAY_FIXED_SIZE)
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{
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*array_size = *(ptr + 1);
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}
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return *ptr;
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}
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// ptr must point to the beginning of a struct field level
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const uint8_t *get_next_struct_field_array_lvl(const uint8_t *ptr)
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{
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switch (*ptr)
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{
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case ARRAY_DYNAMIC:
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break;
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case ARRAY_FIXED_SIZE:
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ptr += 1;
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break;
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default:
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// should not be in here :^)
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break;
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}
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return ptr + 1;
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}
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// Skips TypeDesc and TypeSize/Length+TypeName
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// Came to be since it is used in multiple functions
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// TODO: Find better name
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const uint8_t *struct_field_half_skip(const uint8_t *ptr)
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{
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const uint8_t *field_ptr;
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uint8_t size;
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field_ptr = ptr;
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ptr += 1; // skip TypeDesc
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if (struct_field_type(field_ptr) == TYPE_CUSTOM)
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{
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get_string_in_mem(ptr, &size);
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ptr += (1 + size); // skip typename
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}
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else if (struct_field_has_typesize(field_ptr))
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{
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ptr += 1; // skip TypeSize
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}
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return ptr;
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}
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// ptr must point to the beginning of a struct field
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const uint8_t *get_struct_field_array_lvls_array(const uint8_t *ptr,
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uint8_t *const length)
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{
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ptr = struct_field_half_skip(ptr);
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return get_array_in_mem(ptr, length);
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}
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// ptr must point to the beginning of a struct field
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const char *get_struct_field_keyname(const uint8_t *ptr,
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uint8_t *const length)
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{
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const uint8_t *field_ptr;
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uint8_t size;
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field_ptr = ptr;
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ptr = struct_field_half_skip(ptr);
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if (struct_field_is_array(field_ptr))
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{
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ptr = get_array_in_mem(ptr, &size);
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while (size-- > 0)
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{
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ptr = get_next_struct_field_array_lvl(ptr);
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}
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}
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return get_string_in_mem(ptr, length);
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}
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// ptr must point to the beginning of a struct field
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const uint8_t *get_next_struct_field(const void *ptr)
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{
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uint8_t length;
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ptr = (uint8_t*)get_struct_field_keyname(ptr, &length);
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return (ptr + length);
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}
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// ptr must point to the beginning of a struct
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const char *get_struct_name(const uint8_t *ptr, uint8_t *const length)
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{
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return (char*)get_string_in_mem(ptr, length);
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}
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// ptr must point to the beginning of a struct
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const uint8_t *get_struct_fields_array(const uint8_t *ptr,
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uint8_t *const length)
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{
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uint8_t name_length;
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get_struct_name(ptr, &name_length);
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ptr += (1 + name_length); // skip length
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return get_array_in_mem(ptr, length);
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}
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// ptr must point to the beginning of a struct
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const uint8_t *get_next_struct(const uint8_t *ptr)
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{
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uint8_t fields_count;
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ptr = get_struct_fields_array(ptr, &fields_count);
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while (fields_count-- > 0)
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{
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ptr = get_next_struct_field(ptr);
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}
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return ptr;
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}
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// ptr must point to the size of the structs array
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const uint8_t *get_structs_array(const uint8_t *ptr, uint8_t *const length)
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{
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return get_array_in_mem(ptr, length);
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}
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// Finds struct with a given name
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const uint8_t *get_structn(const uint8_t *const ptr,
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const char *const name_ptr,
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const uint8_t name_length)
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{
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uint8_t structs_count;
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const uint8_t *struct_ptr;
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const char *name;
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uint8_t length;
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struct_ptr = get_structs_array(ptr, &structs_count);
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while (structs_count-- > 0)
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{
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name = get_struct_name(struct_ptr, &length);
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if ((name_length == length) && (memcmp(name, name_ptr, length) == 0))
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{
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return struct_ptr;
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}
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struct_ptr = get_next_struct(struct_ptr);
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}
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return NULL;
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}
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static inline const uint8_t *get_struct(const uint8_t *const ptr,
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const char *const name_ptr)
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{
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return get_structn(ptr, name_ptr, strlen(name_ptr));
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}
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//
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bool set_struct_name(const uint8_t *const data)
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{
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uint8_t *length_ptr;
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char *name_ptr;
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// increment number of structs
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*structs_array += 1;
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// copy length
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if ((length_ptr = mem_alloc(sizeof(uint8_t))) == NULL)
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{
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return false;
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}
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*length_ptr = data[OFFSET_LC];
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// copy name
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if ((name_ptr = mem_alloc(sizeof(char) * data[OFFSET_LC])) == NULL)
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{
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return false;
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}
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memmove(name_ptr, &data[OFFSET_DATA], data[OFFSET_LC]);
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// initialize number of fields
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if ((current_struct_fields_array = mem_alloc(sizeof(uint8_t))) == NULL)
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{
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return false;
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}
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*current_struct_fields_array = 0;
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return true;
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}
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// TODO: Split this function
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bool set_struct_field(const uint8_t *const data)
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{
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uint8_t data_idx = OFFSET_DATA;
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uint8_t *type_desc_ptr;
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uint8_t *type_size_ptr;
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uint8_t *typename_len_ptr;
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char *typename;
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uint8_t *array_levels_count;
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e_array_type *array_level;
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uint8_t *array_level_size;
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uint8_t *fieldname_len_ptr;
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char *fieldname_ptr;
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// increment number of struct fields
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*current_struct_fields_array += 1;
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// copy TypeDesc
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if ((type_desc_ptr = mem_alloc(sizeof(uint8_t))) == NULL)
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{
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return false;
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}
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*type_desc_ptr = data[data_idx++];
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// check TypeSize flag in TypeDesc
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if (*type_desc_ptr & TYPESIZE_MASK)
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{
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// copy TypeSize
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if ((type_size_ptr = mem_alloc(sizeof(uint8_t))) == NULL)
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{
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return false;
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}
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*type_size_ptr = data[data_idx++];
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}
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else if ((*type_desc_ptr & TYPE_MASK) == TYPE_CUSTOM)
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{
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// copy custom struct name length
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if ((typename_len_ptr = mem_alloc(sizeof(uint8_t))) == NULL)
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{
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return false;
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}
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*typename_len_ptr = data[data_idx++];
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// copy name
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if ((typename = mem_alloc(sizeof(char) * *typename_len_ptr)) == NULL)
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{
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return false;
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}
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memmove(typename, &data[data_idx], *typename_len_ptr);
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data_idx += *typename_len_ptr;
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}
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if (*type_desc_ptr & ARRAY_MASK)
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{
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if ((array_levels_count = mem_alloc(sizeof(uint8_t))) == NULL)
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{
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return false;
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}
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*array_levels_count = data[data_idx++];
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for (int idx = 0; idx < *array_levels_count; ++idx)
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{
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if ((array_level = mem_alloc(sizeof(uint8_t))) == NULL)
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{
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return false;
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}
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*array_level = data[data_idx++];
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switch (*array_level)
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{
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case ARRAY_DYNAMIC: // nothing to do
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break;
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case ARRAY_FIXED_SIZE:
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if ((array_level_size = mem_alloc(sizeof(uint8_t))) == NULL)
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{
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return false;
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}
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*array_level_size = data[data_idx++];
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break;
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default:
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// should not be in here :^)
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break;
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}
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}
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}
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// copy length
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if ((fieldname_len_ptr = mem_alloc(sizeof(uint8_t))) == NULL)
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{
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return false;
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}
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*fieldname_len_ptr = data[data_idx++];
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// copy name
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if ((fieldname_ptr = mem_alloc(sizeof(char) * *fieldname_len_ptr)) == NULL)
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{
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return false;
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}
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memmove(fieldname_ptr, &data[data_idx], *fieldname_len_ptr);
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return true;
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}
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bool handle_apdu(const uint8_t *const data)
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{
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switch (data[OFFSET_INS])
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{
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case INS_STRUCT_DEF:
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switch (data[OFFSET_P2])
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{
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case P2_NAME:
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set_struct_name(data);
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break;
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case P2_FIELD:
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set_struct_field(data);
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break;
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default:
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printf("Unknown P2 0x%x for APDU 0x%x\n", data[OFFSET_P2], data[OFFSET_INS]);
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return false;
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}
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break;
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case INS_STRUCT_IMPL:
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switch (data[OFFSET_P2])
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{
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case P2_NAME:
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type_hash(structs_array, (char*)&data[OFFSET_DATA], data[OFFSET_LC]);
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// set root type
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path_set_root((char*)&data[OFFSET_DATA], data[OFFSET_LC]);
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break;
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case P2_FIELD:
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if ((data[OFFSET_P1] != P1_COMPLETE) && (data[OFFSET_P1] != P1_PARTIAL))
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{
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return false;
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}
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field_hash(&data[OFFSET_DATA], data[OFFSET_LC], data[OFFSET_P1] == P1_PARTIAL);
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break;
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case P2_ARRAY:
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path_new_array_depth(data[OFFSET_DATA]);
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break;
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default:
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printf("Unknown P2 0x%x for APDU 0x%x\n", data[OFFSET_P2], data[OFFSET_INS]);
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return false;
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}
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break;
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default:
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printf("Unrecognized APDU (0x%.02x)\n", data[OFFSET_INS]);
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return false;
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}
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return true;
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}
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int main(void)
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{
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uint8_t buf[260]; // 4 bytes APDU header + 256 bytes payload
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uint16_t idx;
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int state;
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uint8_t payload_size = 0;
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init_eip712_context();
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state = OFFSET_CLA;
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idx = 0;
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while (fread(&buf[idx], sizeof(buf[idx]), 1, stdin) > 0)
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{
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switch (state)
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{
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case OFFSET_CLA:
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case OFFSET_INS:
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case OFFSET_P1:
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case OFFSET_P2:
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state += 1;
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idx += 1;
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break;
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case OFFSET_LC:
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payload_size = buf[idx];
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state = OFFSET_DATA;
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idx += 1;
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break;
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case OFFSET_DATA:
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if (--payload_size == 0)
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{
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if (!handle_apdu(buf)) return false;
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state = OFFSET_CLA;
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idx = 0;
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}
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else idx += 1;
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break;
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default:
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printf("Unexpected APDU state!\n");
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return EXIT_FAILURE;
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}
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}
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#ifdef DEBUG
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printf("\n%lu bytes used in RAM\n", (mem_max + 1));
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#endif
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return EXIT_SUCCESS;
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}
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