| /* Capstone Disassembly Engine */ |
| /* By david942j <david942j@gmail.com>, 2019 */ |
| |
| #include <capstone/capstone.h> |
| #include <capstone/platform.h> |
| |
| static csh handle; |
| |
| struct platform { |
| cs_arch arch; |
| cs_mode mode; |
| const unsigned char *code; |
| size_t size; |
| const char *comment; |
| }; |
| |
| static void print_string_hex(const char *comment, const unsigned char *str, size_t len) |
| { |
| const unsigned char *c; |
| |
| printf("%s", comment); |
| for (c = str; c < str + len; c++) { |
| printf(" 0x%02x", *c & 0xff); |
| } |
| |
| printf("\n"); |
| } |
| |
| static const char * ext_name[] = { |
| [BPF_EXT_LEN] = "#len", |
| }; |
| |
| static void print_insn_detail(csh cs_handle, cs_insn *ins) |
| { |
| cs_bpf *bpf; |
| cs_regs regs_read, regs_write; |
| uint8_t regs_read_count, regs_write_count; |
| unsigned i; |
| |
| // detail can be NULL on "data" instruction if SKIPDATA option is turned ON |
| if (ins->detail == NULL) |
| return; |
| |
| if (ins->detail->groups_count) { |
| int j; |
| |
| printf("\tGroups:"); |
| for(j = 0; j < ins->detail->groups_count; j++) |
| printf(" %s", cs_group_name(handle, ins->detail->groups[j])); |
| printf("\n"); |
| } |
| |
| bpf = &(ins->detail->bpf); |
| |
| printf("\tOperand count: %u\n", bpf->op_count); |
| for (i = 0; i < bpf->op_count; i++) { |
| cs_bpf_op *op = &(bpf->operands[i]); |
| printf("\t\toperands[%u].type: ", i); |
| switch (op->type) { |
| case BPF_OP_INVALID: |
| printf("INVALID\n"); |
| break; |
| case BPF_OP_REG: |
| printf("REG = %s\n", cs_reg_name(handle, op->reg)); |
| break; |
| case BPF_OP_IMM: |
| printf("IMM = 0x%" PRIx64 "\n", op->imm); |
| break; |
| case BPF_OP_OFF: |
| printf("OFF = +0x%x\n", op->off); |
| break; |
| case BPF_OP_MEM: |
| printf("MEM\n"); |
| if (op->mem.base != BPF_REG_INVALID) |
| printf("\t\t\toperands[%u].mem.base: REG = %s\n", |
| i, cs_reg_name(handle, op->mem.base)); |
| printf("\t\t\toperands[%u].mem.disp: 0x%x\n", i, op->mem.disp); |
| break; |
| case BPF_OP_MMEM: |
| printf("MMEM = M[0x%x]\n", op->mmem); |
| break; |
| case BPF_OP_MSH: |
| printf("MSH = 4*([0x%x]&0xf)\n", op->msh); |
| break; |
| case BPF_OP_EXT: |
| printf("EXT = %s\n", ext_name[op->ext]); |
| break; |
| } |
| } |
| |
| /* print all registers that are involved in this instruction */ |
| if (!cs_regs_access(cs_handle, ins, |
| regs_read, ®s_read_count, |
| regs_write, ®s_write_count)) { |
| if (regs_read_count) { |
| printf("\tRegisters read:"); |
| for(i = 0; i < regs_read_count; i++) |
| printf(" %s", cs_reg_name(cs_handle, regs_read[i])); |
| printf("\n"); |
| } |
| |
| if (regs_write_count) { |
| printf("\tRegisters modified:"); |
| for(i = 0; i < regs_write_count; i++) |
| printf(" %s", cs_reg_name(cs_handle, regs_write[i])); |
| printf("\n"); |
| } |
| } |
| puts(""); |
| } |
| |
| static void test() |
| { |
| #define CBPF_CODE "\x94\x09\x00\x00\x37\x13\x03\x00" \ |
| "\x87\x00\x00\x00\x00\x00\x00\x00" \ |
| "\x07\x00\x00\x00\x00\x00\x00\x00" \ |
| "\x16\x00\x00\x00\x00\x00\x00\x00" \ |
| "\x80\x00\x00\x00\x00\x00\x00\x00" |
| |
| #define EBPF_CODE "\x97\x09\x00\x00\x37\x13\x03\x00" \ |
| "\xdc\x02\x00\x00\x20\x00\x00\x00" \ |
| "\x30\x00\x00\x00\x00\x00\x00\x00" \ |
| "\xdb\x3a\x00\x01\x00\x00\x00\x00" \ |
| "\x84\x02\x00\x00\x00\x00\x00\x00" \ |
| "\x6d\x33\x17\x02\x00\x00\x00\x00" |
| struct platform platforms[] = { |
| { |
| CS_ARCH_BPF, |
| CS_MODE_LITTLE_ENDIAN | CS_MODE_BPF_CLASSIC, |
| (unsigned char *)CBPF_CODE, |
| sizeof(CBPF_CODE) - 1, |
| "cBPF Le" |
| }, |
| { |
| CS_ARCH_BPF, |
| CS_MODE_LITTLE_ENDIAN | CS_MODE_BPF_EXTENDED, |
| (unsigned char *)EBPF_CODE, |
| sizeof(EBPF_CODE) - 1, |
| "eBPF Le" |
| }, |
| }; |
| uint64_t address = 0x0; |
| cs_insn *insn; |
| int i; |
| size_t count; |
| |
| for (i = 0; i < sizeof(platforms)/sizeof(platforms[0]); i++) { |
| cs_err err = cs_open(platforms[i].arch, platforms[i].mode, &handle); |
| if (err) { |
| printf("Failed on cs_open() with error returned: %u\n", err); |
| abort(); |
| } |
| |
| cs_option(handle, CS_OPT_DETAIL, CS_OPT_ON); |
| |
| count = cs_disasm(handle, platforms[i].code, platforms[i].size, address, 0, &insn); |
| if (count) { |
| size_t j; |
| printf("****************\n"); |
| printf("Platform: %s\n", platforms[i].comment); |
| print_string_hex("Code:", platforms[i].code, platforms[i].size); |
| printf("Disasm:\n"); |
| |
| for (j = 0; j < count; j++) { |
| printf("0x%" PRIx64 ":\t%s\t%s\n", insn[j].address, insn[j].mnemonic, insn[j].op_str); |
| print_insn_detail(handle, &insn[j]); |
| } |
| |
| // free memory allocated by cs_disasm() |
| cs_free(insn, count); |
| } else { |
| printf("****************\n"); |
| printf("Platform: %s\n", platforms[i].comment); |
| print_string_hex("Code:", platforms[i].code, platforms[i].size); |
| printf("ERROR: Failed to disasm given code!\n"); |
| abort(); |
| } |
| |
| cs_close(&handle); |
| } |
| } |
| |
| int main() |
| { |
| test(); |
| return 0; |
| } |