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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_BIND
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/socket.h>
#ifdef AF_UNIX
#include <sys/un.h>
#include <errno.h>
#include <stdio.h>
#include "libfakechroot.h"
#include "strlcpy.h"
#ifdef HAVE_BIND_TYPE_ARG2___CONST_SOCKADDR_ARG__
# define SOCKADDR_UN(addr) ((addr).__sockaddr_un__)
#else
# define SOCKADDR_UN(addr) (addr)
#endif
wrapper(bind, int, (int sockfd, BIND_TYPE_ARG2(addr), socklen_t addrlen))
{
struct sockaddr_un *addr_un = (struct sockaddr_un *)SOCKADDR_UN(addr);
debug("bind(%d, &addr, &addrlen)", sockfd);
if (addr_un->sun_family == AF_UNIX && addr_un->sun_path && *(addr_un->sun_path)) {
socklen_t newaddrlen;
struct sockaddr_un newaddr_un;
const char *af_unix_path = getenv("FAKECHROOT_AF_UNIX_PATH");
const int af_unix_path_max = sizeof(addr_un->sun_path);
char *path = addr_un->sun_path;
if (af_unix_path != NULL) {
char tmp[FAKECHROOT_PATH_MAX];
tmp[af_unix_path_max] = '\0';
snprintf(tmp, af_unix_path_max, "%s/%s", af_unix_path, path);
path = tmp;
}
else {
expand_chroot_path(path);
}
if (strlen(path) >= sizeof(addr_un->sun_path)) {
__set_errno(ENAMETOOLONG);
return -1;
}
memset(&newaddr_un, 0, sizeof(struct sockaddr_un));
newaddr_un.sun_family = addr_un->sun_family;
strlcpy(newaddr_un.sun_path, path, sizeof(newaddr_un.sun_path));
newaddrlen = SUN_LEN(&newaddr_un);
return nextcall(bind)(sockfd, (struct sockaddr *)&newaddr_un, newaddrlen);
}
return nextcall(bind)(sockfd, addr, addrlen);
}
#else
typedef int empty_translation_unit;
#endif
#else
typedef int empty_translation_unit;
#endif
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