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/*
libfakechroot -- fake chroot environment
Copyright (c) 2010, 2013 Piotr Roszatycki <dexter@debian.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <config.h>
#ifdef HAVE___READLINK_CHK
#define _FORTIFY_SOURCE 2
#include <stddef.h>
#include <unistd.h>
#include "libfakechroot.h"
wrapper(__readlink_chk, ssize_t, (const char * path, char * buf, size_t bufsiz, size_t buflen))
{
int linksize;
char tmp[FAKECHROOT_PATH_MAX], *tmpptr;
const char *fakechroot_base = getenv("FAKECHROOT_BASE");
debug("__readlink_chk(\"%s\", &buf, %zd, %zd)", path, bufsiz, buflen);
expand_chroot_path(path);
if ((linksize = nextcall(__readlink_chk)(path, tmp, FAKECHROOT_PATH_MAX-1, buflen)) == -1) {
return -1;
}
tmp[linksize] = '\0';
if (fakechroot_base != NULL) {
tmpptr = strstr(tmp, fakechroot_base);
if (tmpptr != tmp) {
tmpptr = tmp;
}
else if (tmp[strlen(fakechroot_base)] == '\0') {
tmpptr = "/";
linksize = strlen(tmpptr);
}
else if (tmp[strlen(fakechroot_base)] == '/') {
tmpptr = tmp + strlen(fakechroot_base);
linksize -= strlen(fakechroot_base);
}
else {
tmpptr = tmp;
}
if (strlen(tmpptr) > bufsiz) {
linksize = bufsiz;
}
strncpy(buf, tmpptr, linksize);
}
else {
strncpy(buf, tmp, linksize);
}
return linksize;
}
#else
typedef int empty_translation_unit;
#endif
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