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#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>
#include <fcntl.h>
#include <stdio.h>
#define WANT_LD_SO_CONF_SEARCH
static const char *_dl_search_rpath=0;
void _dl_set_rpath(const char *path) { _dl_search_rpath=path; }
/* 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,l=len,i=1;
const char *c,*pe=path+pathlen;
if (path) {
for (c=path; c<pe; c+=i) {
if ((*c==':')||(*c==';')) ++c;
i=strcspn(c,":;");
if (i) {
strncpy(buf, c, i); buf[i]=0;
l-=i;
strncat(buf, "/", l);
}
else
buf[0]=0;
strncat(buf, filename, --l);
// printf("_dl_search: %s\n",buf);
if ((fd=open(buf,O_RDONLY))!=-1) return fd;
}
}
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=open(conf,O_RDONLY);
if (fd!=-1) {
l=read(fd,ld_so_conf,sizeof(ld_so_conf)-1);
ld_so_conf[sizeof(ld_so_conf)-1]=0;
close(fd);
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;
}
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 */
if (getuid()==geteuid()) {
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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