有没有办法在Linux上检查当前的rpath? [英] Is there a way to inspect the current rpath on Linux?

问题描述

我知道可以使用readelf -d <elf> | grep RPATH从外壳检查给定的二进制文件，但是有可能在一个进程中执行此操作吗?

I'm aware that it is possible to use readelf -d <elf> | grep RPATH to inspect a given binary from the shell, but is it possible to do this within a process?

类似的东西(我完全是系统调用):

Something like (my completely made up system call):

  /* get a copy of current rpath into buffer */
  sys_get_current_rpath(&buffer);

我正在尝试在我们的代码库中诊断一些可疑的SO链接问题，并且希望在可能的情况下以这种方式检查RPATH(我宁愿不必生成外部脚本).

I'm trying to diagnose some suspect SO linking issues in our codebase, and would like to inspect the RPATH this way if possible (I'd rather not have to spawn an external script).

推荐答案

#include <stdio.h>
#include <elf.h>
#include <link.h>

int main()
{
  const ElfW(Dyn) *dyn = _DYNAMIC;
  const ElfW(Dyn) *rpath = NULL;
  const char *strtab = NULL;
  for (; dyn->d_tag != DT_NULL; ++dyn) {
    if (dyn->d_tag == DT_RPATH) {
      rpath = dyn;
    } else if (dyn->d_tag == DT_STRTAB) {
      strtab = (const char *)dyn->d_un.d_val;
    }
  }

  if (strtab != NULL && rpath != NULL) {
    printf("RPATH: %s\n", strtab + rpath->d_un.d_val);
  }
  return 0;
}

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