ELF processing

From: ness (e_mc_h2_at_web.de)
Date: 09/25/05 

Date: 25 Sep 2005 00:48:06 -0700

I try to do some ELF processing, It works fine with some files, and
some don't work. I don't understand that.
The piece of code where I parse the file:

assert(argc == 2);
int fd = open(argv[1],O_RDONLY);
assert(fd != -1);
caddr_t addr = mmap(0,15000,PROT_READ,MAP_SHARED,fd,0);
assert((long)addr != -1);

Elf64_Ehdr* elf = (Elf64_Ehdr*)addr;

assert( elf->e_ident[EI_MAG0] == ELFMAG0
                        && elf->e_ident[EI_MAG1] == ELFMAG1
                        && elf->e_ident[EI_MAG2] == ELFMAG2
                        && elf->e_ident[EI_MAG3] == ELFMAG3);

printf("ist ELF-Datei\n");

assert(elf->e_shstrndx != SHN_UNDEF);
assert(elf->e_shstrndx<elf->e_shnum);

printf("%i sections, %i ist der string table\n",elf->e_shnum,
elf->e_shstrndx);

assert(elf->e_shstrndx <= elf->e_shnum);

Elf64_Shdr* strtable = (Elf64_Shdr*)(addr + elf->e_shoff +
elf->e_shstrndx * elf->e_shentsize);

assert(strtable->sh_type == SHT_STRTAB);
assert(strtable->sh_size != 0);

printf("\n");

Elf64_Shdr* tmpsh;
unsigned i;
for(i=1;i<elf->e_shnum;++i)
{
        tmpsh = (Elf64_Shdr*)(addr + elf->e_shoff+ i * elf->e_shentsize);
        printf("%s\t%i\n",(char*)(addr+strtable->sh_offset) +
tmpsh->sh_name,tmpsh->sh_addr);
};

It terminates with "Assertion `strtable->sh_type == 3' failed". (The
line "assert(strtable->sh_type == SHT_STRTAB);")