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#include <stdlib.h>
#include <dlfcn.h>
#include <fcntl.h>
#include "_dl_int.h"
#define WANT_LD_SO_CONF_SEARCH
static const char *_dl_search_rpath=0;
#ifndef __DIET_LD_SO__
#include <unistd.h>
#include <string.h>
void _dl_set_rpath(const char *path) { _dl_search_rpath=path; }
const char* _dl_get_rpath() { return _dl_search_rpath; }
#endif
/* search a colon (semicolon) seperated path for the libraray "filename" */
static int _dl_search_path(char*buf,int len,const char*path,const int pathlen,const char*filename) {
int fd,i=1,fl=strlen(filename),ml=len-fl;
const char*c,*pe=path+pathlen;
if (path) {
for (c=path;c<pe;c+=i) {
int l=len-1;
if ((*c==':')||(*c==';')) ++c;
i=strcspn(c,":;");
if (i) {
if (i>ml) continue; /* if len(path-entry)+len(filename)+2 is greater than the buffer ? SKIP */
memcpy(buf,c,i);
buf[i]='/';
l-=++i;
}
memcpy(buf+i,filename,fl);
buf[i+fl]=0;
#ifdef DEBUG
// pf(__func__": "); pf(buf); pf("\n");
#endif
#ifdef __DIET_LD_SO__
if ((fd=_dl_sys_open(buf,O_RDONLY,0))>-1) return fd;
#else
if ((fd=open(buf,O_RDONLY))!=-1) return fd;
#endif
}
}
return -1;
}
/* parse the SMALL file "conf" for lib directories (aem... hang me if you can :) ) */
static int _dl_search_conf(char*buf,int len,const char*conf,const char*filename) {
char ld_so_conf[1024];
int i,l,fd;
#ifdef __DIET_LD_SO__
if ((fd=_dl_sys_open(conf,O_RDONLY,0))>-1) {
l=_dl_sys_read(fd,ld_so_conf,sizeof(ld_so_conf)-1);
#else
if ((fd=open(conf,O_RDONLY))!=-1) {
l=read(fd,ld_so_conf,sizeof(ld_so_conf)-1);
#endif
ld_so_conf[sizeof(ld_so_conf)-1]=0;
#ifdef __DIET_LD_SO__
_dl_sys_close(fd);
#else
close(fd);
#endif
if (l>0) {
if (ld_so_conf[l-1]=='\n') ld_so_conf[--l]=0;
for (i=0;i<l;i++) if (ld_so_conf[i]=='\n') ld_so_conf[i]=':';
if ((fd=_dl_search_path(buf,len,ld_so_conf,l,filename))!=-1) return fd;
}
}
return -1;
}
#ifdef __DIET_LD_SO__
static
#endif
int _dl_search(char*buf,int len,const char*filename) {
int fd;
/* 1. search the LD_RUN_PATH (from the executable) */
if (_dl_search_rpath) {
if ((fd=_dl_search_path(buf,len,_dl_search_rpath,strlen(_dl_search_rpath),filename))!=-1) return fd;
}
/* 2. IF we have a "secure" enviroment THEN search LD_LIBRARY_PATH */
#ifdef __DIET_LD_SO__
if ((at_uid==at_euid)&&(at_gid==at_egid)) {
#else
if ((getuid()==geteuid())&&(getgid()==getegid())) {
#endif
char *p=getenv("LD_LIBRARY_PATH");
if (p)
if ((fd=_dl_search_path(buf,len,p,strlen(p),filename))!=-1) return fd;
}
/* 3. search all pathes in the the /etc/diet.ld.conf, a dietlibc extension :) */
if ((fd=_dl_search_conf(buf,len,"/etc/diet.ld.conf",filename))!=-1) return fd;
#ifdef WANT_LD_SO_CONF_SEARCH
/* 4. search all pathes in the the /etc/ld.so.conf / can't handle this ...=lib?? crap */
if ((fd=_dl_search_conf(buf,len,"/etc/ld.so.conf",filename))!=-1) return fd;
#endif
/* default path search */
{
const char def_path[]="/usr/lib:/lib";
return _dl_search_path(buf,len,def_path,strlen(def_path),filename);
}
}
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