节标题的打印精灵名称

Question

我有一个C程序，我想在其中打印出输入文件的节头的名称。我根据研究ELF表示法制作了所有内容，并帮助了Internet上的现有程序，但仍然无法正常工作。它仅打印来自for循环的索引，该索引也应为节名称。有人看到我想念的东西吗？

代码：

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <elf.h>

int main(int argc, char *argv[]) {


    int fd;
    int val;

    Elf32_Ehdr elfHdr;
    Elf32_Shdr sectHdr;
    FILE* ElfFile = NULL;
    char* SectNames = NULL;

    if(argc != 2) {
        perror("Error while opening file");
        return 0;
    }   



    ElfFile = fopen(argv[1], "r");
    if(ElfFile == NULL) {
        printf("fopen");
        return -1;
    }

    //preberemo elf header
    fread(&elfHdr, 1, sizeof(Elf64_Ehdr), ElfFile);

    printf("\tVersion: 0x%.2X\n", elfHdr.e_version);

    printf("\tEntry point address: 0x%.8X\n", elfHdr.e_entry);

    printf("\tProgram header offset: 0x%.8X\n", elfHdr.e_phoff);

    printf("\tSection header offset: 0x%.8X\n", elfHdr.e_shoff);

    printf("\tFlags: 0x%.8X\n", elfHdr.e_flags);

    printf("\tSize of this header: 0x%X\n", elfHdr.e_ehsize);

    printf("\tSize of program headers: 0x%X\n", elfHdr.e_phentsize);

    printf("\tNumber of program headers: %d\n", elfHdr.e_phnum);

    printf("\tSize of section headers: 0x%X\n", elfHdr.e_shentsize);

    printf("\tNumber of section headers: %d\n", elfHdr.e_shnum);

    printf("\tSection header string table index: 0x%X\n", elfHdr.e_shstrndx);

    //premik do section tabele
    fseek(ElfFile, elfHdr.e_shoff + elfHdr.e_shstrndx * elfHdr.e_shentsize, SEEK_SET);
    fread(&sectHdr, 1, sizeof(sectHdr), ElfFile);
    SectNames = malloc(sectHdr.sh_size);
    fseek(ElfFile, sectHdr.sh_offset, SEEK_SET);
    fread(SectNames, 1, sectHdr.sh_size, ElfFile);

    for (int idx = 0; idx < elfHdr.e_shnum; idx++){
        char* name = "";

        fseek(ElfFile, elfHdr.e_shoff + idx * sizeof(sectHdr), SEEK_SET);
        fread(&sectHdr, 1, sizeof(sectHdr), ElfFile);

        // print section name
        if (sectHdr.sh_name);
        name = SectNames + sectHdr.sh_name;

        printf("%i %s\n", idx, name);
    }



    close(fd);

    return 0;
}

Answer 1

有人看到我错过的东西吗？

您是否以32位模式编译程序？

它对我有用：

gcc -w -m32 t.c && ./a.out ./a.out
    Version: 0x01
    Entry point address: 0x000010C0
    Program header offset: 0x00000034
    Section header offset: 0x000038B0
    Flags: 0x00000000
    Size of this header: 0x34
    Size of program headers: 0x20
    Number of program headers: 11
    Size of section headers: 0x28
    Number of section headers: 30
    Section header string table index: 0x1D
0
1 .interp
2 .note.gnu.build-id
3 .note.ABI-tag
4 .gnu.hash
5 .dynsym
6 .dynstr
7 .gnu.version
8 .gnu.version_r
9 .rel.dyn
10 .rel.plt
11 .init
12 .plt
13 .plt.got
14 .text
15 .fini
16 .rodata
17 .eh_frame_hdr
18 .eh_frame
19 .init_array
20 .fini_array
21 .dynamic
22 .got
23 .got.plt
24 .data
25 .bss
26 .comment
27 .symtab
28 .strtab
29 .shstrtab

[如果要在64位ELF文件上运行它，则需要用等效的Elf32_Ehdr更改Elf32_Shdr和Elf64_...。