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elf.c
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//
// Created by Vashon on 2020/6/22.
//
#include "elf.h"
#include "elf_utils.h"
#include <stdlib.h>
#include <string.h>
int main() {
runElfParse();
return 0;
}
void runElfParse(void) {
FILE *file = NULL;
file = fopen("../libtest.so", "rb");
if (!file) {
printf("Open file fail\n");
return;
} else {
checkElfFile(file);
}
fclose(file);
}
void checkElfFile(FILE *file) {
if (!file)
return;
unsigned char buff[16]; // 临时缓冲区，用于检测文件类型与文件字长
// void rewind(FILE *stream) 设置文件位置为给定流 stream 的文件的开头
rewind(file);
// 从给定流 stream 读取数据到 ptr 所指向的数组中，成功，则返回读取的数量：nmemb
// size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream)
if (1 == fread(buff, 16 * sizeof(char), 1, file)) {
if (ELFMAG0 == buff[EI_MAG0]
&& ELFMAG1 == buff[EI_MAG1]
&& ELFMAG2 == buff[EI_MAG2]
&& ELFMAG3 == buff[EI_MAG3]) { // elf 文件类型
switch (buff[EI_CLASS]) {
case ELFCLASSNONE: // 未知字长，不做解析
printf("\tClass: \tInvalid class\n");
break;
case ELFCLASS32:
printfElf32_Message(file);
break;
case ELFCLASS64: // 暂时不支持64位字长解析，待完善
printf("\tClass: \t64-bit objects\n");
break;
default: // 未知字长，不做解析
printf("\tClass: \tELF class num %x\n", buff[EI_CLASS]);
}
} else {
printf("This is not elf file\n");
}
} else {
printf("Read file fail\n");
}
}
void printfElf32_Message(FILE *elf) {
rewind(elf); // 读取之前记得将文件位置标识重置
Elf32_Ehdr elf32Ehdr; // elf 头部表
if (1 == fread(&elf32Ehdr, sizeof(Elf32_Ehdr), 1, elf)) {
printfElf32_EhdrMessage(elf32Ehdr);
if (0 == elf32Ehdr.e_phnum)
printf("\nElf file program header is null\n");
else {
printf("\n--------------------------------------\n");
printfElf32_PhdrMessage(elf, elf32Ehdr.e_phoff, elf32Ehdr.e_phnum);
}
if (0 == elf32Ehdr.e_shnum)
printf("\nElf file section header is null\n");
else {
printf("\n--------------------------------------\n");
printfElf32_ShdrMessage(elf, elf32Ehdr.e_shoff, elf32Ehdr.e_shnum, elf32Ehdr.e_shstrndx);
}
} else {
printf("Read elf header fail\n");
}
}
void printfElf32_EhdrMessage(Elf32_Ehdr ehdr) {
printf("ELF Header:\n");
printf("\tMagic: ");
unsigned char *e_ident = ehdr.e_ident;
for (int i = 0; i < EI_NIDENT; ++i) { // i == 4 : 字长，i == 5 : 字节序，i == 6 : elf版本
printf("%02x ", e_ident[i]); // Class:ELF32，Data:little/big endian，Version:1 (current)，OS/ABI，ABI Version
}
printf("\n");
// Class
switch (e_ident[EI_CLASS]) {
case ELFCLASSNONE:
printf("\tClass: \tInvalid class\n");
break;
case ELFCLASS32:
printf("\tClass: \t32-bit objects\n");
break;
case ELFCLASS64:
printf("\tClass: \t64-bit objects\n");
break;
default:
printf("\tClass: \tELF class num %x\n", e_ident[EI_CLASS]);
}
// Data
switch (e_ident[EI_DATA]) {
case ELFDATANONE:
printf("\tData: \tInvalid data encoding\n");
break;
case ELFDATA2LSB:
printf("\tData: \t2's complement, little endian\n");
break;
case ELFDATA2MSB:
printf("\tData: \t2's complement, big endian\n");
break;
default:
printf("\tData: \tELF data num %x\n", e_ident[EI_DATA]);
}
printf("\tVersion: \t%x (current)\n", e_ident[EI_VERSION]);
// OS/ABI
switch (e_ident[EI_OSABI]) {
case ELFOSABI_NONE:
printf("\tOS/ABI: \tUNIX System V\n");
break;
case ELFOSABI_HPUX:
printf("\tOS/ABI: \tHP-UX\n");
break;
case ELFOSABI_NETBSD:
printf("\tOS/ABI: \tNetBSD\n");
break;
case ELFOSABI_GNU:
printf("\tOS/ABI: \tObject uses GNU ELF extensions\n");
break;
case ELFOSABI_SOLARIS:
printf("\tOS/ABI: \tSun Solaris\n");
break;
case ELFOSABI_AIX:
printf("\tOS/ABI: \tIBM AIX\n");
break;
case ELFOSABI_IRIX:
printf("\tOS/ABI: \tSGI Irix\n");
break;
case ELFOSABI_FREEBSD:
printf("\tOS/ABI: \tFreeBSD\n");
break;
case ELFOSABI_TRU64:
printf("\tOS/ABI: \tCompaq TRU64 UNIX\n");
break;
case ELFOSABI_MODESTO:
printf("\tOS/ABI: \tNovell Modesto\n");
break;
case ELFOSABI_OPENBSD:
printf("\tOS/ABI: \tOpenBSD\n");
break;
case ELFOSABI_ARM_AEABI:
printf("\tOS/ABI: \tARM EABI\n");
break;
case ELFOSABI_ARM:
printf("\tOS/ABI: \tARM\n");
break;
case ELFOSABI_STANDALONE:
printf("\tOS/ABI: \tStandalone (embedded) application\n");
break;
default:
printf("\tOS/ABI: \tELF OS/ABI num %x\n", e_ident[EI_OSABI]);
}
printf("\tABI Version: \t%x\n", e_ident[EI_ABIVERSION]);
// Type
switch (ehdr.e_type) {
case ET_NONE:
printf("\tType: \tNo file type\n");
break;
case ET_REL:
printf("\tType: \tRelocatable file\n");
break;
case ET_EXEC:
printf("\tType: \tExecutable file\n");
break;
case ET_DYN:
printf("\tType: \tShared object file\n");
break;
case ET_CORE:
printf("\tType: \tCore file\n");
break;
case ET_NUM:
printf("\tType: \tNumber of defined types\n");
break;
case ET_LOOS:
printf("\tType: \tOS-specific range start\n");
break;
case ET_HIOS:
printf("\tType: \tOS-specific range end\n");
break;
case ET_LOPROC:
printf("\tType: \tProcessor-specific range start\n");
break;
case ET_HIPROC:
printf("\tType: \tProcessor-specific range end\n");
break;
default:
printf("\tType: \tELF type num %x\n", ehdr.e_type);
}
// Machine
switch (ehdr.e_machine) {
case EM_NONE:
printf("\tMachine: \tNo machine\n");
break;
case EM_M32:
printf("\tMachine: \tAT&T WE 32100\n");
break;
case EM_SPARC:
printf("\tMachine: \tSUN SPARC\n");
break;
case EM_386:
printf("\tMachine: \tIntel 80386\n");
break;
case EM_68K:
printf("\tMachine: \tMotorola m68k family\n");
break;
case EM_88K:
printf("\tMachine: \tMotorola m88k family\n");
break;
case EM_IAMCU:
printf("\tMachine: \tIntel MCU\n");
break;
case EM_860:
printf("\tMachine: \tIntel 80860\n");
break;
case EM_MIPS:
printf("\tMachine: \tMIPS R3000 big-endian\n");
break;
case EM_S370:
printf("\tMachine: \tIBM System/370\n");
break;
case EM_MIPS_RS3_LE:
printf("\tMachine: \tMIPS R3000 little-endian\n");
break;
case EM_PARISC:
printf("\tMachine: \tHPPA\n");
break;
case EM_VPP500:
printf("\tMachine: \tFujitsu VPP500\n");
break;
case EM_SPARC32PLUS:
printf("\tMachine: \tSun's \"v8plus\n");
break;
case EM_960:
printf("\tMachine: \tIntel 80960\n");
break;
case EM_PPC:
printf("\tMachine: \tPowerPC\n");
break;
case EM_PPC64:
printf("\tMachine: \tPowerPC 64-bit\n");
break;
case EM_S390:
printf("\tMachine: \tIBM S390\n");
break;
case EM_SPU:
printf("\tMachine: \tIBM SPU/SPC\n");
break;
case EM_V800:
printf("\tMachine: \tNEC V800 series\n");
break;
case EM_FR20:
printf("\tMachine: \tFujitsu FR20\n");
break;
case EM_RH32:
printf("\tMachine: \tTRW RH-32\n");
break;
case EM_RCE:
printf("\tMachine: \tMotorola RCE\n");
break;
case EM_ARM:
printf("\tMachine: \tARM\n");
break;
case EM_FAKE_ALPHA:
printf("\tMachine: \tDigital Alpha\n");
break;
case EM_SH:
printf("\tMachine: \tHitachi SH\n");
break;
case EM_SPARCV9:
printf("\tMachine: \tSPARC v9 64-bit\n");
break;
case EM_TRICORE:
printf("\tMachine: \tSiemens Tricore\n");
break;
case EM_ARC:
printf("\tMachine: \tArgonaut RISC Core\n");
break;
case EM_H8_300:
printf("\tMachine: \tHitachi H8/300\n");
break;
case EM_H8_300H:
printf("\tMachine: \tHitachi H8/300H\n");
break;
case EM_H8S:
printf("\tMachine: \tHitachi H8S\n");
break;
case EM_H8_500:
printf("\tMachine: \tHitachi H8/500\n");
break;
case EM_IA_64:
printf("\tMachine: \tIntel Merced\n");
break;
case EM_MIPS_X:
printf("\tMachine: \tStanford MIPS-X\n");
break;
case EM_COLDFIRE:
printf("\tMachine: \tMotorola Coldfire\n");
break;
case EM_68HC12:
printf("\tMachine: \tMotorola M68HC12\n");
break;
case EM_MMA:
printf("\tMachine: \tFujitsu MMA Multimedia Accelerator\n");
break;
case EM_PCP:
printf("\tMachine: \tSiemens PCP\n");
break;
case EM_NCPU:
printf("\tMachine: \tSony nCPU embeeded RISC\n");
break;
case EM_NDR1:
printf("\tMachine: \tDenso NDR1 microprocessor\n");
break;
case EM_STARCORE:
printf("\tMachine: \tMotorola Start*Core processor\n");
break;
case EM_ME16:
printf("\tMachine: \tToyota ME16 processor\n");
break;
case EM_ST100:
printf("\tMachine: \tSTMicroelectronic ST100 processor\n");
break;
case EM_TINYJ:
printf("\tMachine: \tAdvanced Logic Corp. Tinyj emb.fam\n");
break;
case EM_X86_64:
printf("\tMachine: \tAMD x86-64 architecture\n");
break;
case EM_PDSP:
printf("\tMachine: \tSony DSP Processor\n");
break;
case EM_PDP10:
printf("\tMachine: \tDigital PDP-10\n");
break;
case EM_PDP11:
printf("\tMachine: \tDigital PDP-11\n");
break;
case EM_FX66:
printf("\tMachine: \tSiemens FX66 microcontroller\n");
break;
case EM_ST9PLUS:
printf("\tMachine: \tSTMicroelectronics ST9+ 8/16 mc\n");
break;
case EM_ST7:
printf("\tMachine: \tSTmicroelectronics ST7 8 bit mc\n");
break;
case EM_68HC16:
printf("\tMachine: \tMotorola MC68HC16 microcontroller\n");
break;
case EM_68HC11:
printf("\tMachine: \tMotorola MC68HC11 microcontroller\n");
break;
case EM_68HC08:
printf("\tMachine: \tMotorola MC68HC08 microcontroller\n");
break;
case EM_68HC05:
printf("\tMachine: \tMotorola MC68HC05 microcontroller\n");
break;
case EM_SVX:
printf("\tMachine: \tSilicon Graphics SVx\n");
break;
case EM_ST19:
printf("\tMachine: \tSTMicroelectronics ST19 8 bit mc\n");
break;
case EM_VAX:
printf("\tMachine: \tDigital VAX\n");
break;
case EM_CRIS:
printf("\tMachine: \tAxis Communications 32-bit emb.proc\n");
break;
case EM_JAVELIN:
printf("\tMachine: \tInfineon Technologies 32-bit emb.proc\n");
break;
case EM_FIREPATH:
printf("\tMachine: \tElement 14 64-bit DSP Processor\n");
break;
case EM_ZSP:
printf("\tMachine: \tLSI Logic 16-bit DSP Processor\n");
break;
case EM_MMIX:
printf("\tMachine: \tDonald Knuth's educational 64-bit proc\n");
break;
case EM_HUANY:
printf("\tMachine: \tHarvard University machine-independent object files\n");
break;
case EM_PRISM:
printf("\tMachine: \tSiTera Prism\n");
break;
case EM_AVR:
printf("\tMachine: \tAtmel AVR 8-bit microcontroller\n");
break;
case EM_FR30:
printf("\tMachine: \tFujitsu FR30\n");
break;
case EM_D10V:
printf("\tMachine: \tMitsubishi D10V\n");
break;
case EM_D30V:
printf("\tMachine: \tMitsubishi D30V\n");
break;
case EM_V850:
printf("\tMachine: \tNEC v850\n");
break;
case EM_M32R:
printf("\tMachine: \tMitsubishi M32R\n");
break;
case EM_MN10300:
printf("\tMachine: \tMatsushita MN10300\n");
break;
case EM_MN10200:
printf("\tMachine: \tMatsushita MN10200\n");
break;
case EM_PJ:
printf("\tMachine: \tpicoJava\n");
break;
case EM_OPENRISC:
printf("\tMachine: \tOpenRISC 32-bit embedded processor\n");
break;
case EM_ARC_COMPACT:
printf("\tMachine: \tARC International ARCompact\n");
break;
case EM_XTENSA:
printf("\tMachine: \tTensilica Xtensa Architecture\n");
break;
case EM_VIDEOCORE:
printf("\tMachine: \tAlphamosaic VideoCore\n");
break;
case EM_TMM_GPP:
printf("\tMachine: \tThompson Multimedia General Purpose Proc\n");
break;
case EM_NS32K:
printf("\tMachine: \tNational Semi. 32000\n");
break;
case EM_TPC:
printf("\tMachine: \tTenor Network TPC\n");
break;
case EM_SNP1K:
printf("\tMachine: \tTrebia SNP 1000\n");
break;
case EM_ST200:
printf("\tMachine: \tSTMicroelectronics ST200\n");
break;
case EM_IP2K:
printf("\tMachine: \tUbicom IP2xxx\n");
break;
case EM_MAX:
printf("\tMachine: \tMAX processor\n");
break;
case EM_CR:
printf("\tMachine: \tNational Semi. CompactRISC\n");
break;
case EM_F2MC16:
printf("\tMachine: \tFujitsu F2MC16\n");
break;
case EM_MSP430:
printf("\tMachine: \tTexas Instruments msp430\n");
break;
case EM_BLACKFIN:
printf("\tMachine: \tAnalog Devices Blackfin DSP\n");
break;
case EM_SE_C33:
printf("\tMachine: \tSeiko Epson S1C33 family\n");
break;
case EM_SEP:
printf("\tMachine: \tSharp embedded microprocessor\n");
break;
case EM_ARCA:
printf("\tMachine: \tArca RISC\n");
break;
case EM_UNICORE:
printf("\tMachine: \tPKU-Unity & MPRC Peking Uni. mc series\n");
break;
case EM_EXCESS:
printf("\tMachine: \teXcess configurable cpu\n");
break;
case EM_DXP:
printf("\tMachine: \tIcera Semi. Deep Execution Processor\n");
break;
case EM_ALTERA_NIOS2:
printf("\tMachine: \tAltera Nios II\n");
break;
case EM_CRX:
printf("\tMachine: \tNational Semi. CompactRISC CRX\n");
break;
case EM_XGATE:
printf("\tMachine: \tMotorola XGATE\n");
break;
case EM_C166:
printf("\tMachine: \tInfineon C16x/XC16x\n");
break;
case EM_M16C:
printf("\tMachine: \tRenesas M16C\n");
break;
case EM_DSPIC30F:
printf("\tMachine: \tMicrochip Technology dsPIC30F\n");
break;
case EM_CE:
printf("\tMachine: \tFreescale Communication Engine RISC\n");
break;
case EM_M32C:
printf("\tMachine: \tRenesas M32C\n");
break;
case EM_TSK3000:
printf("\tMachine: \tAltium TSK3000\n");
break;
case EM_RS08:
printf("\tMachine: \tFreescale RS08\n");
break;
case EM_SHARC:
printf("\tMachine: \tAnalog Devices SHARC family\n");
break;
case EM_ECOG2:
printf("\tMachine: \tCyan Technology eCOG2\n");
break;
case EM_SCORE7:
printf("\tMachine: \tSunplus S+core7 RISC\n");
break;
case EM_DSP24:
printf("\tMachine: \tNew Japan Radio (NJR) 24-bit DSP\n");
break;
case EM_VIDEOCORE3:
printf("\tMachine: \tBroadcom VideoCore III\n");
break;
case EM_LATTICEMICO32:
printf("\tMachine: \tRISC for Lattice FPGA\n");
break;
case EM_SE_C17:
printf("\tMachine: \tSeiko Epson C17\n");
break;
case EM_TI_C6000:
printf("\tMachine: \tTexas Instruments TMS320C6000 DSP\n");
break;
case EM_TI_C2000:
printf("\tMachine: \tTexas Instruments TMS320C2000 DSP\n");
break;
case EM_TI_C5500:
printf("\tMachine: \tTexas Instruments TMS320C55x DSP\n");
break;
case EM_TI_ARP32:
printf("\tMachine: \tTexas Instruments App. Specific RISC\n");
break;
case EM_TI_PRU:
printf("\tMachine: \tTexas Instruments Prog. Realtime Unit\n");
break;
case EM_MMDSP_PLUS:
printf("\tMachine: \tSTMicroelectronics 64bit VLIW DSP\n");
break;
case EM_CYPRESS_M8C:
printf("\tMachine: \tCypress M8C\n");
break;
case EM_R32C:
printf("\tMachine: \tRenesas R32C\n");
break;
case EM_TRIMEDIA:
printf("\tMachine: \tNXP Semi. TriMedia\n");
break;
case EM_QDSP6:
printf("\tMachine: \tQUALCOMM DSP6\n");
break;
case EM_8051:
printf("\tMachine: \tIntel 8051 and variants\n");
break;
case EM_STXP7X:
printf("\tMachine: \tSTMicroelectronics STxP7x\n");
break;
case EM_NDS32:
printf("\tMachine: \tAndes Tech. compact code emb. RISC\n");
break;
case EM_ECOG1X:
printf("\tMachine: \tCyan Technology eCOG1X\n");
break;
case EM_MAXQ30:
printf("\tMachine: \tDallas Semi. MAXQ30 mc\n");
break;
case EM_XIMO16:
printf("\tMachine: \tNew Japan Radio (NJR) 16-bit DSP\n");
break;
case EM_MANIK:
printf("\tMachine: \tM2000 Reconfigurable RISC\n");
break;
case EM_CRAYNV2:
printf("\tMachine: \tCray NV2 vector architecture\n");
break;
case EM_RX:
printf("\tMachine: \tRenesas RX\n");
break;
case EM_METAG:
printf("\tMachine: \tImagination Tech. META\n");
break;
case EM_MCST_ELBRUS:
printf("\tMachine: \tMCST Elbrus\n");
break;
case EM_ECOG16:
printf("\tMachine: \tCyan Technology eCOG16\n");
break;
case EM_CR16:
printf("\tMachine: \tNational Semi. CompactRISC CR16\n");
break;
case EM_ETPU:
printf("\tMachine: \tFreescale Extended Time Processing Unit\n");
break;
case EM_SLE9X:
printf("\tMachine: \tInfineon Tech. SLE9X\n");
break;
case EM_L10M:
printf("\tMachine: \tIntel L10M\n");
break;
case EM_K10M:
printf("\tMachine: \tIntel K10M\n");
break;
case EM_AARCH64:
printf("\tMachine: \tARM AARCH64\n");
break;
case EM_AVR32:
printf("\tMachine: \tAmtel 32-bit microprocessor\n");
break;
case EM_STM8:
printf("\tMachine: \tSTMicroelectronics STM8\n");
break;
case EM_TILE64:
printf("\tMachine: \tTileta TILE64\n");
break;
case EM_TILEPRO:
printf("\tMachine: \tTilera TILEPro\n");
break;
case EM_MICROBLAZE:
printf("\tMachine: \tXilinx MicroBlaze\n");
break;
case EM_CUDA:
printf("\tMachine: \tNVIDIA CUDA\n");
break;
case EM_TILEGX:
printf("\tMachine: \tTilera TILE-Gx\n");
break;
case EM_CLOUDSHIELD:
printf("\tMachine: \tCloudShield\n");
break;
case EM_COREA_1ST:
printf("\tMachine: \tKIPO-KAIST Core-A 1st gen\n");
break;
case EM_COREA_2ND:
printf("\tMachine: \tKIPO-KAIST Core-A 2nd gen\n");
break;
case EM_ARC_COMPACT2:
printf("\tMachine: \tSynopsys ARCompact V2\n");
break;
case EM_OPEN8:
printf("\tMachine: \tOpen8 RISC\n");
break;
case EM_RL78:
printf("\tMachine: \tRenesas RL78\n");
break;
case EM_VIDEOCORE5:
printf("\tMachine: \tBroadcom VideoCore V\n");
break;
case EM_78KOR:
printf("\tMachine: \tRenesas 78KOR\n");
break;
case EM_56800EX:
printf("\tMachine: \tFreescale 56800EX DSC\n");
break;
case EM_BA1:
printf("\tMachine: \tBeyond BA1\n");
break;
case EM_BA2:
printf("\tMachine: \tBeyond BA2\n");
break;
case EM_XCORE:
printf("\tMachine: \tXMOS xCORE\n");
break;
case EM_MCHP_PIC:
printf("\tMachine: \tMicrochip 8-bit PIC(r)\n");
break;
case EM_KM32:
printf("\tMachine: \tKM211 KM32\n");
break;
case EM_KMX32:
printf("\tMachine: \tKM211 KMX32\n");
break;
case EM_EMX16:
printf("\tMachine: \tKM211 KMX16\n");
break;
case EM_EMX8:
printf("\tMachine: \tKM211 KMX8\n");
break;
case EM_KVARC:
printf("\tMachine: \tKM211 KVARC\n");
break;
case EM_CDP:
printf("\tMachine: \tPaneve CDP\n");
break;
case EM_COGE:
printf("\tMachine: \tCognitive Smart Memory Processor\n");
break;
case EM_COOL:
printf("\tMachine: \tBluechip CoolEngine\n");
break;
case EM_NORC:
printf("\tMachine: \tNanoradio Optimized RISC\n");
break;
case EM_CSR_KALIMBA:
printf("\tMachine: \tCSR Kalimba\n");
break;
case EM_Z80:
printf("\tMachine: \tZilog Z80\n");
break;
case EM_VISIUM:
printf("\tMachine: \tControls and Data Services VISIUMcore\n");
break;
case EM_FT32:
printf("\tMachine: \tFTDI Chip FT32\n");
break;
case EM_MOXIE:
printf("\tMachine: \tMoxie processor\n");
break;
case EM_AMDGPU:
printf("\tMachine: \tAMD GPU\n");
break;
case EM_RISCV:
printf("\tMachine: \tRISC-V\n");
break;
case EM_BPF:
printf("\tMachine: \tLinux BPF -- in-kernel virtual machine\n");
break;
default:
printf("\tMachine: \tELF machine num %x\n", ehdr.e_machine);
}
// Version
switch (ehdr.e_version) {
case EV_NONE:
printf("\tVersion: \tInvalid ELF version\n");
break;
case EV_CURRENT:
printf("\tVersion: \t0x%x (Current version)\n", ehdr.e_version);
break;
default:
printf("\tVersion: \tELF version num %x\n", ehdr.e_version);
}
printf("\tEntry point address: \t0x%x\n", ehdr.e_entry); // 入口点的虚拟地址
printf("\tStart of program headers: \t%d (bytes into file)\n", ehdr.e_phoff); // 程序头部表偏移量
printf("\tStart of section headers: \t%d (bytes into file)\n", ehdr.e_shoff); // 节头部表偏移量
printf("\tFlags: \t0x%x\n", ehdr.e_flags); // 保存与文件相关的，特定于处理器的标志
printf("\tSize of this header: \t%d (bytes)\n", ehdr.e_ehsize); // ELF 头大小(字节)
printf("\tSize of program headers: \t%d (bytes)\n", ehdr.e_phentsize); // 程序头部条目大小
printf("\tNumber of program headers: \t%d\n", ehdr.e_phnum); // 程序头部条目数量
printf("\tSize of section headers: \t%d (bytes)\n", ehdr.e_shentsize); // 节头部条目大小
printf("\tNumber of section headers: \t%d\n", ehdr.e_shnum); // 节头部条目数量
printf("\tSection header string table index:\t%d\n", ehdr.e_shstrndx); // 节头部字符串表的索引
}
void printfElf32_PhdrMessage(FILE *elf, int offset, int count) {
// int fseek(FILE *stream, long int offset, int whence) 设置流 stream 的文件位置为给定的偏移 offset，参数 offset 意味着从给定的 whence 位置查找的字节数。
// fseek(elf, 0, SEEK_SET);
// 将文件位置标识移动到程序头部位置
fseek(elf, offset, SEEK_SET);
// long int ftell(FILE *stream) 返回给定流 stream 的当前文件位置
printf("Program header from %ld bytes\n", ftell(elf));
printf("The Program Header Message:\n");
Elf32_Phdr *phdr = malloc(count * sizeof(Elf32_Phdr));
if (count == fread(phdr, sizeof(Elf32_Phdr), count, elf)) {
Elf32_Phdr *p = phdr;
char typeName[16];
char flag[12];
printf("%-16s%-8s%-10s%-10s%-10s%-10s%-10s%-6s\n",
"Type", "Offset", "VirtAddr", "PhysAddr", "FileSize", "MemSize", "Flg", "Al");
for (int i = 0; i < count; ++i, p++) {
getSegmentTypeNameByType(p->p_type, typeName);
getSegmentFlagNameByFlags(p->p_flags, flag);
printf("%-16s%-#8x%-#10x%-#10x%-#10x%-#10x%-10s%-6d\n", \
typeName, p->p_offset, \
p->p_vaddr, p->p_paddr, \
p->p_filesz, p->p_memsz, \
flag, p->p_align);
}
} else
printf("Read program header fail\n");
free(phdr);
phdr = NULL;
}
void getSegmentTypeNameByType(uint32_t type, char name[]) {
memset(name, '\0', 16);
// 注意，这里不可以直接：name = "NULL"这样进行赋值，只能通过strcpy这个函数或者自己逐个字符读写
switch (type) {
case PT_NULL:
strcpy(name, "NULL");
break;
case PT_LOAD:
strcpy(name, "LOAD");
break;
case PT_DYNAMIC:
strcpy(name, "DYNAMIC");
break;
case PT_INTERP:
strcpy(name, "INTERP");
break;
case PT_NOTE:
strcpy(name, "NOTE");
break;
case PT_SHLIB:
strcpy(name, "SHLIB");
break;
case PT_PHDR:
strcpy(name, "PHDR");
break;
case PT_TLS:
strcpy(name, "TLS");
break;
case PT_NUM:
strcpy(name, "NUM");
break;
case PT_LOOS:
strcpy(name, "LOOS");
break;
case PT_GNU_EH_FRAME:
strcpy(name, "GNU_EH_FRAME");
break;
case PT_GNU_STACK:
strcpy(name, "GNU_STACK");
break;
case PT_GNU_RELRO:
strcpy(name, "GNU_RELRO");
break;
case PT_SUNWBSS:
strcpy(name, "SUNWBSS");
break;
case PT_SUNWSTACK:
strcpy(name, "SUNWSTACK");
break;
case PT_HIOS:
strcpy(name, "HIOS");
break;
case PT_LOPROC:
strcpy(name, "LOPROC");
break;
case PT_HIPROC:
strcpy(name, "HIPROC");
break;
default:
strcpy(name, "NULL");
}
}
void getSegmentFlagNameByFlags(uint32_t flags, char flag[]) {
memset(flag, '\0', 12);
char temp[12];
memset(temp, '\0', 12);
int index = 0;
uint32_t result = 0;
result |= flags;
if (result & PF_X)
temp[index++] = 'X';
if (result & PF_W)
temp[index++] = 'W';
if (result & PF_R)
temp[index++] = 'R';
if (result & PF_MASKOS)
temp[index++] = 'S';
if (result & PF_MASKPROC)
temp[index++] = 'C';
strcpy(flag, temp);
//#define PF_X (1 << 0) /* Segment is executable */
//#define PF_W (1 << 1) /* Segment is writable */
//#define PF_R (1 << 2) /* Segment is readable */
//#define PF_MASKOS 0x0ff00000 /* OS-specific */
//#define PF_MASKPROC 0xf0000000 /* Processor-specific */
}
void printfElf32_ShdrMessage(FILE *elf, int offset, int count, uint16_t shstrndx) {
fseek(elf, offset, SEEK_SET);
printf("Section header from %ld bytes\n", ftell(elf));
printf("The Section Header Message:\n");
Elf32_Shdr *shdr = malloc(count * sizeof(Elf32_Shdr));
Elf32_Sym sym; // 符号表
if (count == fread(shdr, sizeof(Elf32_Shdr), count, elf)) {
Elf32_Shdr shstr = shdr[shstrndx];
Elf32_Shdr *s = shdr;
char srcName[shstr.sh_size];
char destName[24];
char typeName[16];
char flag[12];
fseek(elf, shstr.sh_offset, SEEK_SET); // 将文件偏移到节表字符串表的位置
fread(srcName, shstr.sh_size, 1, elf); // 读取劫镖字符串表
printf("\t[%2s]\t%-24s%-12s\t%-8s\t%-6s\t%-6s\t%2s\t%3s\t%2s\t%3s\t%2s\n",
"Nr", "Name", "Type", "Addr", "Off", "Size", "ES", "Flg", "Lk", "Inf", "Al");
for (int i = 0; i < count; ++i, s++) {
getSectionNameByName(s->sh_name, srcName, destName);
getSectionTypeNameByType(s->sh_type, typeName);
getSectionFlagNameByFlags(s->sh_flags, flag);
printf("\t[%2d]\t%-24s%-12s\t%08x\t%06x\t%06x\t%-2d\t%-s\t%-2d\t%-2d\t%-2d\n", \
i, destName, typeName, s->sh_addr, \
s->sh_offset, s->sh_size, s->sh_entsize, \
flag, s->sh_link, s->sh_info, s->sh_addralign);
}
} else
printf("Read program header fail\n");
free(shdr);
shdr = NULL;
}
void getSectionNameByName(uint32_t nameIndex, char srcName[], char destName[]) {
char *name = srcName;
name += nameIndex; // 将指针变量向后偏移 index 位
memset(destName, '\0', 24);
strcpy(destName, name);
}
void getSectionTypeNameByType(uint32_t type, char name[]) {
memset(name, '\0', 16);
// 注意，这里不可以直接：name = "NULL"这样进行赋值，只能通过strcpy这个函数或者自己逐个字符读写
switch (type) {
case SHT_NULL:
strcpy(name, "NULL");
break;
case SHT_PROGBITS:
strcpy(name, "PROGBITS");
break;
case SHT_SYMTAB:
strcpy(name, "SYMTAB");
break;
case SHT_STRTAB:
strcpy(name, "STRTAB");
break;
case SHT_RELA:
strcpy(name, "RELA");
break;
case SHT_HASH:
strcpy(name, "HASH");
break;
case SHT_DYNAMIC:
strcpy(name, "DYNAMIC");
break;
case SHT_NOTE:
strcpy(name, "NOTE");
break;
case SHT_NOBITS:
strcpy(name, "NOBITS");
break;
case SHT_REL:
strcpy(name, "REL");
break;
case SHT_SHLIB:
strcpy(name, "SHLIB");
break;
case SHT_DYNSYM:
strcpy(name, "DYNSYM");
break;
case SHT_INIT_ARRAY:
strcpy(name, "INIT_ARRAY");
break;
case SHT_FINI_ARRAY:
strcpy(name, "FINI_ARRAY");
break;
case SHT_PREINIT_ARRAY:
strcpy(name, "PREINIT_ARRAY");
break;
case SHT_GROUP:
strcpy(name, "GROUP");
break;
case SHT_SYMTAB_SHNDX:
strcpy(name, "SYMTAB_SHNDX");
break;
case SHT_NUM:
strcpy(name, "NUM");
break;
case SHT_LOOS:
strcpy(name, "LOOS");
break;
case SHT_GNU_ATTRIBUTES:
strcpy(name, "GNU_ATTRIBUTES");
break;
case SHT_GNU_HASH:
strcpy(name, "GNU_HASH");
break;
case SHT_GNU_LIBLIST:
strcpy(name, "GNU_LIBLIST");
break;
case SHT_CHECKSUM:
strcpy(name, "CHECKSUM");
break;
case SHT_LOSUNW:
strcpy(name, "LOSUNW");
break;
case SHT_SUNW_COMDAT:
strcpy(name, "SUNW_COMDAT");