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/* adapted from Eric Youngdale's readelf program */
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <elf_abi.h>
char *xstrdup(char *);
char *readsoname(FILE *infile)
{
Elf32_Ehdr *epnt;
Elf32_Phdr *ppnt;
int i;
char *header;
unsigned int dynamic_addr = 0;
unsigned int dynamic_size = 0;
int strtab_val = 0;
int soname_val = 0;
int loadaddr = -1;
int loadbase = 0;
Elf32_Dyn *dpnt;
struct stat st;
char *res = NULL;
if (fstat(fileno(infile), &st))
return NULL;
header = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fileno(infile), 0);
if (header == (caddr_t)-1)
return NULL;
epnt = (Elf32_Ehdr *)header;
if ((int)(epnt+1) > (int)(header + st.st_size))
goto skip;
ppnt = (Elf32_Phdr *)&header[epnt->e_phoff];
if ((int)ppnt < (int)header ||
(int)(ppnt+epnt->e_phnum) > (int)(header + st.st_size))
goto skip;
for(i = 0; i < epnt->e_phnum; i++)
{
if (loadaddr == -1 && ppnt->p_vaddr != 0)
loadaddr = (ppnt->p_vaddr & 0xfffff000) -
(ppnt->p_offset & 0xfffff000);
if(ppnt->p_type == 2)
{
dynamic_addr = ppnt->p_offset;
dynamic_size = ppnt->p_filesz;
};
ppnt++;
};
dpnt = (Elf32_Dyn *) &header[dynamic_addr];
dynamic_size = dynamic_size / sizeof(Elf32_Dyn);
if ((int)dpnt < (int)header ||
(int)(dpnt+dynamic_size) > (int)(header + st.st_size))
goto skip;
while(dpnt->d_tag != DT_NULL)
{
if (dpnt->d_tag == DT_STRTAB)
strtab_val = dpnt->d_un.d_val;
if (dpnt->d_tag == DT_SONAME)
soname_val = dpnt->d_un.d_val;
#define DT_MIPS_BASE_ADDRESS 0x70000006 /* XXX */
if (dpnt->d_tag == DT_MIPS_BASE_ADDRESS)
loadbase = dpnt->d_un.d_val;
dpnt++;
};
if (!strtab_val || !soname_val)
goto skip;
if (soname_val + strtab_val - loadbase < 0 ||
soname_val + strtab_val - loadbase >= st.st_size)
goto skip;
res = xstrdup((char *) (header - loadbase + strtab_val + soname_val));
skip:
munmap(header, st.st_size);
return res;
}
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