File: [cvs.NetBSD.org] / src / lib / librumphijack / hijack.c (download)
Revision 1.109.2.1.2.1, Thu Mar 3 14:27:54 2016 UTC (8 years, 1 month ago) by martin
Branch: netbsd-7-0
CVS Tags: netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE
Changes since 1.109.2.1: +37 -2
lines
Pull up following revision(s) (requested by nakayama in ticket #1096):
bin/mv/mv.c: revision 1.44
bin/cp/utils.c: revision 1.43-1.44
lib/librumphijack/hijack.c: revision 1.112-1.115
usr.bin/touch/touch.c: revision 1.33
sbin/restore/tape.c: revision 1.68
sbin/restore/dirs.c: revision 1.51
Don't truncate at sub-microsecond while preserving timestamps.
One of motivation of this change is to make the behavior of test(1)
-nt/ot with preserved copy (like cp -p) closer to the NetBSD 6.
Of course whether full timestamps are kept or not depends also on
underlying file system.
The ifdef added in mv(1) since existing ifdefs was our local change
to compile it on solaris (though I couldn't test it):
http://mail-index.netbsd.org/tech-userlevel/2014/11/28/msg008831.html
Fix the name of failed function in warning message.
Hijack utimensat(2) so that t_vfs test passes after cp(1)/mv(1) are
changed to use the system call. Linux also has this system call, but
not tested this on linux.
Also hijack futimens(2) so that t_sh test passes.
Define a generic ATCALL() and use it to implement utimensat()
Make ATCALL() behave for absolute paths too.
|
/* $NetBSD: hijack.c,v 1.109.2.1.2.1 2016/03/03 14:27:54 martin Exp $ */
/*-
* Copyright (c) 2011 Antti Kantee. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <rump/rumpuser_port.h>
#if !defined(lint)
__RCSID("$NetBSD: hijack.c,v 1.109.2.1.2.1 2016/03/03 14:27:54 martin Exp $");
#endif
#include <sys/param.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/uio.h>
#ifdef PLATFORM_HAS_NBVFSSTAT
#include <sys/statvfs.h>
#endif
#ifdef PLATFORM_HAS_KQUEUE
#include <sys/event.h>
#endif
#ifdef PLATFORM_HAS_NBQUOTA
#include <sys/quotactl.h>
#endif
#include <assert.h>
#include <dlfcn.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <pthread.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <rump/rumpclient.h>
#include <rump/rump_syscalls.h>
#include "hijack.h"
/*
* XXX: Consider autogenerating this, syscnames[] and syscalls[] with
* a DSL where the tool also checks the symbols exported by this library
* to make sure all relevant calls are accounted for.
*/
enum dualcall {
DUALCALL_WRITE, DUALCALL_WRITEV, DUALCALL_PWRITE, DUALCALL_PWRITEV,
DUALCALL_IOCTL, DUALCALL_FCNTL,
DUALCALL_SOCKET, DUALCALL_ACCEPT, DUALCALL_BIND, DUALCALL_CONNECT,
DUALCALL_GETPEERNAME, DUALCALL_GETSOCKNAME, DUALCALL_LISTEN,
DUALCALL_RECVFROM, DUALCALL_RECVMSG,
DUALCALL_SENDTO, DUALCALL_SENDMSG,
DUALCALL_GETSOCKOPT, DUALCALL_SETSOCKOPT,
DUALCALL_SHUTDOWN,
DUALCALL_READ, DUALCALL_READV, DUALCALL_PREAD, DUALCALL_PREADV,
DUALCALL_DUP2,
DUALCALL_CLOSE,
DUALCALL_POLLTS,
#ifndef __linux__
DUALCALL_STAT, DUALCALL_LSTAT, DUALCALL_FSTAT,
#endif
DUALCALL_CHMOD, DUALCALL_LCHMOD, DUALCALL_FCHMOD,
DUALCALL_CHOWN, DUALCALL_LCHOWN, DUALCALL_FCHOWN,
DUALCALL_OPEN,
DUALCALL_CHDIR, DUALCALL_FCHDIR,
DUALCALL_LSEEK,
DUALCALL_UNLINK, DUALCALL_SYMLINK, DUALCALL_READLINK,
DUALCALL_LINK, DUALCALL_RENAME,
DUALCALL_MKDIR, DUALCALL_RMDIR,
DUALCALL_UTIMES, DUALCALL_LUTIMES, DUALCALL_FUTIMES,
DUALCALL_UTIMENSAT, DUALCALL_FUTIMENS,
DUALCALL_TRUNCATE, DUALCALL_FTRUNCATE,
DUALCALL_FSYNC,
DUALCALL_ACCESS,
#ifndef __linux__
DUALCALL___GETCWD,
DUALCALL_GETDENTS,
#endif
#ifndef __linux__
DUALCALL_MKNOD,
#endif
#ifdef PLATFORM_HAS_NBFILEHANDLE
DUALCALL_GETFH, DUALCALL_FHOPEN, DUALCALL_FHSTAT, DUALCALL_FHSTATVFS1,
#endif
#ifdef PLATFORM_HAS_KQUEUE
DUALCALL_KEVENT,
#endif
#ifdef PLATFORM_HAS_NBSYSCTL
DUALCALL___SYSCTL,
#endif
#ifdef PLATFORM_HAS_NFSSVC
DUALCALL_NFSSVC,
#endif
#ifdef PLATFORM_HAS_NBVFSSTAT
DUALCALL_STATVFS1, DUALCALL_FSTATVFS1, DUALCALL_GETVFSSTAT,
#endif
#ifdef PLATFORM_HAS_NBMOUNT
DUALCALL_MOUNT, DUALCALL_UNMOUNT,
#endif
#ifdef PLATFORM_HAS_FSYNC_RANGE
DUALCALL_FSYNC_RANGE,
#endif
#ifdef PLATFORM_HAS_CHFLAGS
DUALCALL_CHFLAGS, DUALCALL_LCHFLAGS, DUALCALL_FCHFLAGS,
#endif
#ifdef PLATFORM_HAS_NBQUOTA
DUALCALL_QUOTACTL,
#endif
DUALCALL__NUM
};
#define RSYS_STRING(a) __STRING(a)
#define RSYS_NAME(a) RSYS_STRING(__CONCAT(RUMP_SYS_RENAME_,a))
/*
* Would be nice to get this automatically in sync with libc.
* Also, this does not work for compat-using binaries (we should
* provide all previous interfaces, not just the current ones)
*/
#if defined(__NetBSD__)
#if !__NetBSD_Prereq__(5,99,7)
#define REALSELECT select
#define REALPOLLTS pollts
#define REALKEVENT kevent
#define REALSTAT __stat30
#define REALLSTAT __lstat30
#define REALFSTAT __fstat30
#define REALUTIMES utimes
#define REALLUTIMES lutimes
#define REALFUTIMES futimes
#define REALMKNOD mknod
#define REALFHSTAT __fhstat40
#else /* >= 5.99.7 */
#define REALSELECT _sys___select50
#define REALPOLLTS _sys___pollts50
#define REALKEVENT _sys___kevent50
#define REALSTAT __stat50
#define REALLSTAT __lstat50
#define REALFSTAT __fstat50
#define REALUTIMES __utimes50
#define REALLUTIMES __lutimes50
#define REALFUTIMES __futimes50
#define REALMKNOD __mknod50
#define REALFHSTAT __fhstat50
#endif /* < 5.99.7 */
#define REALREAD _sys_read
#define REALPREAD _sys_pread
#define REALPWRITE _sys_pwrite
#define REALGETDENTS __getdents30
#define REALMOUNT __mount50
#define REALGETFH __getfh30
#define REALFHOPEN __fhopen40
#define REALFHSTATVFS1 __fhstatvfs140
#define OLDREALQUOTACTL __quotactl50 /* 5.99.48-62 only */
#define REALSOCKET __socket30
#define LSEEK_ALIAS _lseek
#define VFORK __vfork14
int REALSTAT(const char *, struct stat *);
int REALLSTAT(const char *, struct stat *);
int REALFSTAT(int, struct stat *);
int REALMKNOD(const char *, mode_t, dev_t);
int REALGETDENTS(int, char *, size_t);
int __getcwd(char *, size_t);
#elif defined(__linux__) /* glibc, really */
#define REALREAD read
#define REALPREAD pread
#define REALPWRITE pwrite
#define REALSELECT select
#define REALPOLLTS ppoll
#define REALUTIMES utimes
#define REALLUTIMES lutimes
#define REALFUTIMES futimes
#define REALFHSTAT fhstat
#define REALSOCKET socket
#else /* !NetBSD && !linux */
#error platform not supported
#endif /* platform */
int REALSELECT(int, fd_set *, fd_set *, fd_set *, struct timeval *);
int REALPOLLTS(struct pollfd *, nfds_t,
const struct timespec *, const sigset_t *);
int REALKEVENT(int, const struct kevent *, size_t, struct kevent *, size_t,
const struct timespec *);
ssize_t REALREAD(int, void *, size_t);
ssize_t REALPREAD(int, void *, size_t, off_t);
ssize_t REALPWRITE(int, const void *, size_t, off_t);
int REALUTIMES(const char *, const struct timeval [2]);
int REALLUTIMES(const char *, const struct timeval [2]);
int REALFUTIMES(int, const struct timeval [2]);
int REALMOUNT(const char *, const char *, int, void *, size_t);
int REALGETFH(const char *, void *, size_t *);
int REALFHOPEN(const void *, size_t, int);
int REALFHSTAT(const void *, size_t, struct stat *);
int REALFHSTATVFS1(const void *, size_t, struct statvfs *, int);
int REALSOCKET(int, int, int);
#ifdef PLATFORM_HAS_NBQUOTA
int OLDREALQUOTACTL(const char *, struct plistref *);
#endif
#define S(a) __STRING(a)
struct sysnames {
enum dualcall scm_callnum;
const char *scm_hostname;
const char *scm_rumpname;
} syscnames[] = {
{ DUALCALL_SOCKET, S(REALSOCKET), RSYS_NAME(SOCKET) },
{ DUALCALL_ACCEPT, "accept", RSYS_NAME(ACCEPT) },
{ DUALCALL_BIND, "bind", RSYS_NAME(BIND) },
{ DUALCALL_CONNECT, "connect", RSYS_NAME(CONNECT) },
{ DUALCALL_GETPEERNAME, "getpeername", RSYS_NAME(GETPEERNAME) },
{ DUALCALL_GETSOCKNAME, "getsockname", RSYS_NAME(GETSOCKNAME) },
{ DUALCALL_LISTEN, "listen", RSYS_NAME(LISTEN) },
{ DUALCALL_RECVFROM, "recvfrom", RSYS_NAME(RECVFROM) },
{ DUALCALL_RECVMSG, "recvmsg", RSYS_NAME(RECVMSG) },
{ DUALCALL_SENDTO, "sendto", RSYS_NAME(SENDTO) },
{ DUALCALL_SENDMSG, "sendmsg", RSYS_NAME(SENDMSG) },
{ DUALCALL_GETSOCKOPT, "getsockopt", RSYS_NAME(GETSOCKOPT) },
{ DUALCALL_SETSOCKOPT, "setsockopt", RSYS_NAME(SETSOCKOPT) },
{ DUALCALL_SHUTDOWN, "shutdown", RSYS_NAME(SHUTDOWN) },
{ DUALCALL_READ, S(REALREAD), RSYS_NAME(READ) },
{ DUALCALL_READV, "readv", RSYS_NAME(READV) },
{ DUALCALL_PREAD, S(REALPREAD), RSYS_NAME(PREAD) },
{ DUALCALL_PREADV, "preadv", RSYS_NAME(PREADV) },
{ DUALCALL_WRITE, "write", RSYS_NAME(WRITE) },
{ DUALCALL_WRITEV, "writev", RSYS_NAME(WRITEV) },
{ DUALCALL_PWRITE, S(REALPWRITE), RSYS_NAME(PWRITE) },
{ DUALCALL_PWRITEV, "pwritev", RSYS_NAME(PWRITEV) },
{ DUALCALL_IOCTL, "ioctl", RSYS_NAME(IOCTL) },
{ DUALCALL_FCNTL, "fcntl", RSYS_NAME(FCNTL) },
{ DUALCALL_DUP2, "dup2", RSYS_NAME(DUP2) },
{ DUALCALL_CLOSE, "close", RSYS_NAME(CLOSE) },
{ DUALCALL_POLLTS, S(REALPOLLTS), RSYS_NAME(POLLTS) },
#ifndef __linux__
{ DUALCALL_STAT, S(REALSTAT), RSYS_NAME(STAT) },
{ DUALCALL_LSTAT, S(REALLSTAT), RSYS_NAME(LSTAT) },
{ DUALCALL_FSTAT, S(REALFSTAT), RSYS_NAME(FSTAT) },
#endif
{ DUALCALL_CHOWN, "chown", RSYS_NAME(CHOWN) },
{ DUALCALL_LCHOWN, "lchown", RSYS_NAME(LCHOWN) },
{ DUALCALL_FCHOWN, "fchown", RSYS_NAME(FCHOWN) },
{ DUALCALL_CHMOD, "chmod", RSYS_NAME(CHMOD) },
{ DUALCALL_LCHMOD, "lchmod", RSYS_NAME(LCHMOD) },
{ DUALCALL_FCHMOD, "fchmod", RSYS_NAME(FCHMOD) },
{ DUALCALL_UTIMES, S(REALUTIMES), RSYS_NAME(UTIMES) },
{ DUALCALL_LUTIMES, S(REALLUTIMES), RSYS_NAME(LUTIMES) },
{ DUALCALL_FUTIMES, S(REALFUTIMES), RSYS_NAME(FUTIMES) },
{ DUALCALL_UTIMENSAT, "utimensat", RSYS_NAME(UTIMENSAT) },
{ DUALCALL_FUTIMENS, "futimens", RSYS_NAME(FUTIMENS) },
{ DUALCALL_OPEN, "open", RSYS_NAME(OPEN) },
{ DUALCALL_CHDIR, "chdir", RSYS_NAME(CHDIR) },
{ DUALCALL_FCHDIR, "fchdir", RSYS_NAME(FCHDIR) },
{ DUALCALL_LSEEK, "lseek", RSYS_NAME(LSEEK) },
{ DUALCALL_UNLINK, "unlink", RSYS_NAME(UNLINK) },
{ DUALCALL_SYMLINK, "symlink", RSYS_NAME(SYMLINK) },
{ DUALCALL_READLINK, "readlink", RSYS_NAME(READLINK) },
{ DUALCALL_LINK, "link", RSYS_NAME(LINK) },
{ DUALCALL_RENAME, "rename", RSYS_NAME(RENAME) },
{ DUALCALL_MKDIR, "mkdir", RSYS_NAME(MKDIR) },
{ DUALCALL_RMDIR, "rmdir", RSYS_NAME(RMDIR) },
{ DUALCALL_TRUNCATE, "truncate", RSYS_NAME(TRUNCATE) },
{ DUALCALL_FTRUNCATE, "ftruncate", RSYS_NAME(FTRUNCATE) },
{ DUALCALL_FSYNC, "fsync", RSYS_NAME(FSYNC) },
{ DUALCALL_ACCESS, "access", RSYS_NAME(ACCESS) },
#ifndef __linux__
{ DUALCALL___GETCWD, "__getcwd", RSYS_NAME(__GETCWD) },
{ DUALCALL_GETDENTS, S(REALGETDENTS),RSYS_NAME(GETDENTS) },
#endif
#ifndef __linux__
{ DUALCALL_MKNOD, S(REALMKNOD), RSYS_NAME(MKNOD) },
#endif
#ifdef PLATFORM_HAS_NBFILEHANDLE
{ DUALCALL_GETFH, S(REALGETFH), RSYS_NAME(GETFH) },
{ DUALCALL_FHOPEN, S(REALFHOPEN), RSYS_NAME(FHOPEN) },
{ DUALCALL_FHSTAT, S(REALFHSTAT), RSYS_NAME(FHSTAT) },
{ DUALCALL_FHSTATVFS1, S(REALFHSTATVFS1),RSYS_NAME(FHSTATVFS1) },
#endif
#ifdef PLATFORM_HAS_KQUEUE
{ DUALCALL_KEVENT, S(REALKEVENT), RSYS_NAME(KEVENT) },
#endif
#ifdef PLATFORM_HAS_NBSYSCTL
{ DUALCALL___SYSCTL, "__sysctl", RSYS_NAME(__SYSCTL) },
#endif
#ifdef PLATFORM_HAS_NFSSVC
{ DUALCALL_NFSSVC, "nfssvc", RSYS_NAME(NFSSVC) },
#endif
#ifdef PLATFORM_HAS_NBVFSSTAT
{ DUALCALL_STATVFS1, "statvfs1", RSYS_NAME(STATVFS1) },
{ DUALCALL_FSTATVFS1, "fstatvfs1", RSYS_NAME(FSTATVFS1) },
{ DUALCALL_GETVFSSTAT, "getvfsstat", RSYS_NAME(GETVFSSTAT) },
#endif
#ifdef PLATFORM_HAS_NBMOUNT
{ DUALCALL_MOUNT, S(REALMOUNT), RSYS_NAME(MOUNT) },
{ DUALCALL_UNMOUNT, "unmount", RSYS_NAME(UNMOUNT) },
#endif
#ifdef PLATFORM_HAS_FSYNC_RANGE
{ DUALCALL_FSYNC_RANGE, "fsync_range", RSYS_NAME(FSYNC_RANGE) },
#endif
#ifdef PLATFORM_HAS_CHFLAGS
{ DUALCALL_CHFLAGS, "chflags", RSYS_NAME(CHFLAGS) },
{ DUALCALL_LCHFLAGS, "lchflags", RSYS_NAME(LCHFLAGS) },
{ DUALCALL_FCHFLAGS, "fchflags", RSYS_NAME(FCHFLAGS) },
#endif /* PLATFORM_HAS_CHFLAGS */
#ifdef PLATFORM_HAS_NBQUOTA
#if __NetBSD_Prereq__(5,99,63)
{ DUALCALL_QUOTACTL, "__quotactl", RSYS_NAME(__QUOTACTL) },
#elif __NetBSD_Prereq__(5,99,48)
{ DUALCALL_QUOTACTL, S(OLDREALQUOTACTL),RSYS_NAME(QUOTACTL) },
#endif
#endif /* PLATFORM_HAS_NBQUOTA */
};
#undef S
struct bothsys {
void *bs_host;
void *bs_rump;
} syscalls[DUALCALL__NUM];
#define GETSYSCALL(which, name) syscalls[DUALCALL_##name].bs_##which
static pid_t (*host_fork)(void);
static int (*host_daemon)(int, int);
static void * (*host_mmap)(void *, size_t, int, int, int, off_t);
/*
* This tracks if our process is in a subdirectory of /rump.
* It's preserved over exec.
*/
static bool pwdinrump;
enum pathtype { PATH_HOST, PATH_RUMP, PATH_RUMPBLANKET };
static bool fd_isrump(int);
static enum pathtype path_isrump(const char *);
/* default FD_SETSIZE is 256 ==> default fdoff is 128 */
static int hijack_fdoff = FD_SETSIZE/2;
/*
* Maintain a mapping table for the usual dup2 suspects.
* Could use atomic ops to operate on dup2vec, but an application
* racing there is not well-defined, so don't bother.
*/
/* note: you cannot change this without editing the env-passing code */
#define DUP2HIGH 2
static uint32_t dup2vec[DUP2HIGH+1];
#define DUP2BIT (1<<31)
#define DUP2ALIAS (1<<30)
#define DUP2FDMASK ((1<<30)-1)
static bool
isdup2d(int fd)
{
return fd <= DUP2HIGH && fd >= 0 && dup2vec[fd] & DUP2BIT;
}
static int
mapdup2(int hostfd)
{
_DIAGASSERT(isdup2d(hostfd));
return dup2vec[hostfd] & DUP2FDMASK;
}
static int
unmapdup2(int rumpfd)
{
int i;
for (i = 0; i <= DUP2HIGH; i++) {
if (dup2vec[i] & DUP2BIT &&
(dup2vec[i] & DUP2FDMASK) == (unsigned)rumpfd)
return i;
}
return -1;
}
static void
setdup2(int hostfd, int rumpfd)
{
if (hostfd > DUP2HIGH) {
_DIAGASSERT(0);
return;
}
dup2vec[hostfd] = DUP2BIT | DUP2ALIAS | rumpfd;
}
static void
clrdup2(int hostfd)
{
if (hostfd > DUP2HIGH) {
_DIAGASSERT(0);
return;
}
dup2vec[hostfd] = 0;
}
static bool
killdup2alias(int rumpfd)
{
int hostfd;
if ((hostfd = unmapdup2(rumpfd)) == -1)
return false;
if (dup2vec[hostfd] & DUP2ALIAS) {
dup2vec[hostfd] &= ~DUP2ALIAS;
return true;
}
return false;
}
//#define DEBUGJACK
#ifdef DEBUGJACK
#define DPRINTF(x) mydprintf x
static void
mydprintf(const char *fmt, ...)
{
va_list ap;
if (isdup2d(STDERR_FILENO))
return;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
}
static const char *
whichfd(int fd)
{
if (fd == -1)
return "-1";
else if (fd_isrump(fd))
return "rump";
else
return "host";
}
static const char *
whichpath(const char *path)
{
if (path_isrump(path))
return "rump";
else
return "host";
}
#else
#define DPRINTF(x)
#endif
#define ATCALL(type, name, rcname, args, proto, vars) \
type name args \
{ \
type (*fun) proto; \
int isrump = -1; \
\
if (fd == AT_FDCWD || *path == '/') { \
isrump = path_isrump(path); \
} else { \
isrump = fd_isrump(fd); \
} \
\
DPRINTF(("%s -> %d:%s (%s)\n", __STRING(name), \
fd, path, isrump ? "rump" : "host")); \
\
assert(isrump != -1); \
if (isrump) { \
fun = syscalls[rcname].bs_rump; \
if (fd != AT_FDCWD) \
fd = fd_host2rump(fd); \
path = path_host2rump(path); \
} else { \
fun = syscalls[rcname].bs_host; \
} \
return fun vars; \
}
#define FDCALL(type, name, rcname, args, proto, vars) \
type name args \
{ \
type (*fun) proto; \
\
DPRINTF(("%s -> %d (%s)\n", __STRING(name), fd, whichfd(fd))); \
if (fd_isrump(fd)) { \
fun = syscalls[rcname].bs_rump; \
fd = fd_host2rump(fd); \
} else { \
fun = syscalls[rcname].bs_host; \
} \
\
return fun vars; \
}
#define PATHCALL(type, name, rcname, args, proto, vars) \
type name args \
{ \
type (*fun) proto; \
enum pathtype pt; \
\
DPRINTF(("%s -> %s (%s)\n", __STRING(name), path, \
whichpath(path))); \
if ((pt = path_isrump(path)) != PATH_HOST) { \
fun = syscalls[rcname].bs_rump; \
if (pt == PATH_RUMP) \
path = path_host2rump(path); \
} else { \
fun = syscalls[rcname].bs_host; \
} \
\
return fun vars; \
}
#define VFSCALL(bit, type, name, rcname, args, proto, vars) \
type name args \
{ \
type (*fun) proto; \
\
DPRINTF(("%s (0x%x, 0x%x)\n", __STRING(name), bit, vfsbits)); \
if (vfsbits & bit) { \
fun = syscalls[rcname].bs_rump; \
} else { \
fun = syscalls[rcname].bs_host; \
} \
\
return fun vars; \
}
/*
* These variables are set from the RUMPHIJACK string and control
* which operations can product rump kernel file descriptors.
* This should be easily extendable for future needs.
*/
#define RUMPHIJACK_DEFAULT "path=/rump,socket=all:nolocal"
static bool rumpsockets[PF_MAX];
static const char *rumpprefix;
static size_t rumpprefixlen;
static struct {
int pf;
const char *name;
} socketmap[] = {
{ PF_LOCAL, "local" },
{ PF_INET, "inet" },
#ifdef PF_LINK
{ PF_LINK, "link" },
#endif
#ifdef PF_OROUTE
{ PF_OROUTE, "oroute" },
#endif
{ PF_ROUTE, "route" },
{ PF_INET6, "inet6" },
#ifdef PF_MPLS
{ PF_MPLS, "mpls" },
#endif
{ -1, NULL }
};
static void
sockparser(char *buf)
{
char *p, *l = NULL;
bool value;
int i;
/* if "all" is present, it must be specified first */
if (strncmp(buf, "all", strlen("all")) == 0) {
for (i = 0; i < (int)__arraycount(rumpsockets); i++) {
rumpsockets[i] = true;
}
buf += strlen("all");
if (*buf == ':')
buf++;
}
for (p = strtok_r(buf, ":", &l); p; p = strtok_r(NULL, ":", &l)) {
value = true;
if (strncmp(p, "no", strlen("no")) == 0) {
value = false;
p += strlen("no");
}
for (i = 0; socketmap[i].name; i++) {
if (strcmp(p, socketmap[i].name) == 0) {
rumpsockets[socketmap[i].pf] = value;
break;
}
}
if (socketmap[i].name == NULL) {
errx(1, "invalid socket specifier %s", p);
}
}
}
static void
pathparser(char *buf)
{
/* sanity-check */
if (*buf != '/')
errx(1, "hijack path specifier must begin with ``/''");
rumpprefixlen = strlen(buf);
if (rumpprefixlen < 2)
errx(1, "invalid hijack prefix: %s", buf);
if (buf[rumpprefixlen-1] == '/' && strspn(buf, "/") != rumpprefixlen)
errx(1, "hijack prefix may end in slash only if pure "
"slash, gave %s", buf);
if ((rumpprefix = strdup(buf)) == NULL)
err(1, "strdup");
rumpprefixlen = strlen(rumpprefix);
}
static struct blanket {
const char *pfx;
size_t len;
} *blanket;
static int nblanket;
static void
blanketparser(char *buf)
{
char *p, *l = NULL;
int i;
for (nblanket = 0, p = buf; p; p = strchr(p+1, ':'), nblanket++)
continue;
blanket = malloc(nblanket * sizeof(*blanket));
if (blanket == NULL)
err(1, "alloc blanket %d", nblanket);
for (p = strtok_r(buf, ":", &l), i = 0; p;
p = strtok_r(NULL, ":", &l), i++) {
blanket[i].pfx = strdup(p);
if (blanket[i].pfx == NULL)
err(1, "strdup blanket");
blanket[i].len = strlen(p);
if (blanket[i].len == 0 || *blanket[i].pfx != '/')
errx(1, "invalid blanket specifier %s", p);
if (*(blanket[i].pfx + blanket[i].len-1) == '/')
errx(1, "invalid blanket specifier %s", p);
}
}
#define VFSBIT_NFSSVC 0x01
#define VFSBIT_GETVFSSTAT 0x02
#define VFSBIT_FHCALLS 0x04
static unsigned vfsbits;
static struct {
int bit;
const char *name;
} vfscalls[] = {
{ VFSBIT_NFSSVC, "nfssvc" },
{ VFSBIT_GETVFSSTAT, "getvfsstat" },
{ VFSBIT_FHCALLS, "fhcalls" },
{ -1, NULL }
};
static void
vfsparser(char *buf)
{
char *p, *l = NULL;
bool turnon;
unsigned int fullmask;
int i;
/* build the full mask and sanity-check while we're at it */
fullmask = 0;
for (i = 0; vfscalls[i].name != NULL; i++) {
if (fullmask & vfscalls[i].bit)
errx(1, "problem exists between vi and chair");
fullmask |= vfscalls[i].bit;
}
/* if "all" is present, it must be specified first */
if (strncmp(buf, "all", strlen("all")) == 0) {
vfsbits = fullmask;
buf += strlen("all");
if (*buf == ':')
buf++;
}
for (p = strtok_r(buf, ":", &l); p; p = strtok_r(NULL, ":", &l)) {
turnon = true;
if (strncmp(p, "no", strlen("no")) == 0) {
turnon = false;
p += strlen("no");
}
for (i = 0; vfscalls[i].name; i++) {
if (strcmp(p, vfscalls[i].name) == 0) {
if (turnon)
vfsbits |= vfscalls[i].bit;
else
vfsbits &= ~vfscalls[i].bit;
break;
}
}
if (vfscalls[i].name == NULL) {
errx(1, "invalid vfscall specifier %s", p);
}
}
}
static bool rumpsysctl = false;
static void
sysctlparser(char *buf)
{
if (buf == NULL) {
rumpsysctl = true;
return;
}
if (strcasecmp(buf, "y") == 0 || strcasecmp(buf, "yes") == 0 ||
strcasecmp(buf, "yep") == 0 || strcasecmp(buf, "tottakai") == 0) {
rumpsysctl = true;
return;
}
if (strcasecmp(buf, "n") == 0 || strcasecmp(buf, "no") == 0) {
rumpsysctl = false;
return;
}
errx(1, "sysctl value should be y(es)/n(o), gave: %s", buf);
}
static void
fdoffparser(char *buf)
{
unsigned long fdoff;
char *ep;
if (*buf == '-') {
errx(1, "fdoff must not be negative");
}
fdoff = strtoul(buf, &ep, 10);
if (*ep != '\0')
errx(1, "invalid fdoff specifier \"%s\"", buf);
if (fdoff >= INT_MAX/2 || fdoff < 3)
errx(1, "fdoff out of range");
hijack_fdoff = fdoff;
}
static struct {
void (*parsefn)(char *);
const char *name;
bool needvalues;
} hijackparse[] = {
{ sockparser, "socket", true },
{ pathparser, "path", true },
{ blanketparser, "blanket", true },
{ vfsparser, "vfs", true },
{ sysctlparser, "sysctl", false },
{ fdoffparser, "fdoff", true },
{ NULL, NULL, false },
};
static void
parsehijack(char *hijack)
{
char *p, *p2, *l;
const char *hijackcopy;
bool nop2;
int i;
if ((hijackcopy = strdup(hijack)) == NULL)
err(1, "strdup");
/* disable everything explicitly */
for (i = 0; i < PF_MAX; i++)
rumpsockets[i] = false;
for (p = strtok_r(hijack, ",", &l); p; p = strtok_r(NULL, ",", &l)) {
nop2 = false;
p2 = strchr(p, '=');
if (!p2) {
nop2 = true;
p2 = p + strlen(p);
}
for (i = 0; hijackparse[i].parsefn; i++) {
if (strncmp(hijackparse[i].name, p,
(size_t)(p2-p)) == 0) {
if (nop2 && hijackparse[i].needvalues)
errx(1, "invalid hijack specifier: %s",
hijackcopy);
hijackparse[i].parsefn(nop2 ? NULL : p2+1);
break;
}
}
if (hijackparse[i].parsefn == NULL)
errx(1, "invalid hijack specifier name in %s", p);
}
}
static void __attribute__((constructor))
rcinit(void)
{
char buf[1024];
unsigned i, j;
host_fork = dlsym(RTLD_NEXT, "fork");
host_daemon = dlsym(RTLD_NEXT, "daemon");
host_mmap = dlsym(RTLD_NEXT, "mmap");
/*
* In theory cannot print anything during lookups because
* we might not have the call vector set up. so, the errx()
* is a bit of a strech, but it might work.
*/
for (i = 0; i < DUALCALL__NUM; i++) {
/* build runtime O(1) access */
for (j = 0; j < __arraycount(syscnames); j++) {
if (syscnames[j].scm_callnum == i)
break;
}
if (j == __arraycount(syscnames))
errx(1, "rumphijack error: syscall pos %d missing", i);
syscalls[i].bs_host = dlsym(RTLD_NEXT,
syscnames[j].scm_hostname);
if (syscalls[i].bs_host == NULL)
errx(1, "hostcall %s not found!",
syscnames[j].scm_hostname);
syscalls[i].bs_rump = dlsym(RTLD_NEXT,
syscnames[j].scm_rumpname);
if (syscalls[i].bs_rump == NULL)
errx(1, "rumpcall %s not found!",
syscnames[j].scm_rumpname);
}
if (rumpclient_init() == -1)
err(1, "rumpclient init");
/* check which syscalls we're supposed to hijack */
if (getenv_r("RUMPHIJACK", buf, sizeof(buf)) == -1) {
strcpy(buf, RUMPHIJACK_DEFAULT);
}
parsehijack(buf);
/* set client persistence level */
if (getenv_r("RUMPHIJACK_RETRYCONNECT", buf, sizeof(buf)) != -1) {
if (strcmp(buf, "die") == 0)
rumpclient_setconnretry(RUMPCLIENT_RETRYCONN_DIE);
else if (strcmp(buf, "inftime") == 0)
rumpclient_setconnretry(RUMPCLIENT_RETRYCONN_INFTIME);
else if (strcmp(buf, "once") == 0)
rumpclient_setconnretry(RUMPCLIENT_RETRYCONN_ONCE);
else {
time_t timeout;
char *ep;
timeout = (time_t)strtoll(buf, &ep, 10);
if (timeout <= 0 || ep != buf + strlen(buf))
errx(1, "RUMPHIJACK_RETRYCONNECT must be "
"keyword or integer, got: %s", buf);
rumpclient_setconnretry(timeout);
}
}
if (getenv_r("RUMPHIJACK__DUP2INFO", buf, sizeof(buf)) == 0) {
if (sscanf(buf, "%u,%u,%u",
&dup2vec[0], &dup2vec[1], &dup2vec[2]) != 3) {
warnx("invalid dup2mask: %s", buf);
memset(dup2vec, 0, sizeof(dup2vec));
}
unsetenv("RUMPHIJACK__DUP2INFO");
}
if (getenv_r("RUMPHIJACK__PWDINRUMP", buf, sizeof(buf)) == 0) {
pwdinrump = true;
unsetenv("RUMPHIJACK__PWDINRUMP");
}
}
static int
fd_rump2host(int fd)
{
if (fd == -1)
return fd;
return fd + hijack_fdoff;
}
static int
fd_rump2host_withdup(int fd)
{
int hfd;
_DIAGASSERT(fd != -1);
hfd = unmapdup2(fd);
if (hfd != -1) {
_DIAGASSERT(hfd <= DUP2HIGH);
return hfd;
}
return fd_rump2host(fd);
}
static int
fd_host2rump(int fd)
{
if (!isdup2d(fd))
return fd - hijack_fdoff;
else
return mapdup2(fd);
}
static bool
fd_isrump(int fd)
{
return isdup2d(fd) || fd >= hijack_fdoff;
}
#define assertfd(_fd_) assert(ISDUP2D(_fd_) || (_fd_) >= hijack_fdoff)
static enum pathtype
path_isrump(const char *path)
{
size_t plen;
int i;
if (rumpprefix == NULL && nblanket == 0)
return PATH_HOST;
if (*path == '/') {
plen = strlen(path);
if (rumpprefix && plen >= rumpprefixlen) {
if (strncmp(path, rumpprefix, rumpprefixlen) == 0
&& (plen == rumpprefixlen
|| *(path + rumpprefixlen) == '/')) {
return PATH_RUMP;
}
}
for (i = 0; i < nblanket; i++) {
if (strncmp(path, blanket[i].pfx, blanket[i].len) == 0)
return PATH_RUMPBLANKET;
}
return PATH_HOST;
} else {
return pwdinrump ? PATH_RUMP : PATH_HOST;
}
}
static const char *rootpath = "/";
static const char *
path_host2rump(const char *path)
{
const char *rv;
if (*path == '/') {
rv = path + rumpprefixlen;
if (*rv == '\0')
rv = rootpath;
} else {
rv = path;
}
return rv;
}
static int
dodup(int oldd, int minfd)
{
int (*op_fcntl)(int, int, ...);
int newd;
int isrump;
DPRINTF(("dup -> %d (minfd %d)\n", oldd, minfd));
if (fd_isrump(oldd)) {
op_fcntl = GETSYSCALL(rump, FCNTL);
oldd = fd_host2rump(oldd);
if (minfd >= hijack_fdoff)
minfd -= hijack_fdoff;
isrump = 1;
} else {
op_fcntl = GETSYSCALL(host, FCNTL);
isrump = 0;
}
newd = op_fcntl(oldd, F_DUPFD, minfd);
if (isrump)
newd = fd_rump2host(newd);
DPRINTF(("dup <- %d\n", newd));
return newd;
}
/*
* Check that host fd value does not exceed fdoffset and if necessary
* dup the file descriptor so that it doesn't collide with the dup2mask.
*/
static int
fd_host2host(int fd)
{
int (*op_fcntl)(int, int, ...) = GETSYSCALL(host, FCNTL);
int (*op_close)(int) = GETSYSCALL(host, CLOSE);
int ofd, i;
if (fd >= hijack_fdoff) {
op_close(fd);
errno = ENFILE;
return -1;
}
for (i = 1; isdup2d(fd); i++) {
ofd = fd;
fd = op_fcntl(ofd, F_DUPFD, i);
op_close(ofd);
}
return fd;
}
int
open(const char *path, int flags, ...)
{
int (*op_open)(const char *, int, ...);
bool isrump;
va_list ap;
enum pathtype pt;
int fd;
DPRINTF(("open -> %s (%s)\n", path, whichpath(path)));
if ((pt = path_isrump(path)) != PATH_HOST) {
if (pt == PATH_RUMP)
path = path_host2rump(path);
op_open = GETSYSCALL(rump, OPEN);
isrump = true;
} else {
op_open = GETSYSCALL(host, OPEN);
isrump = false;
}
va_start(ap, flags);
fd = op_open(path, flags, va_arg(ap, mode_t));
va_end(ap);
if (isrump)
fd = fd_rump2host(fd);
else
fd = fd_host2host(fd);
DPRINTF(("open <- %d (%s)\n", fd, whichfd(fd)));
return fd;
}
int
chdir(const char *path)
{
int (*op_chdir)(const char *);
enum pathtype pt;
int rv;
if ((pt = path_isrump(path)) != PATH_HOST) {
op_chdir = GETSYSCALL(rump, CHDIR);
if (pt == PATH_RUMP)
path = path_host2rump(path);
} else {
op_chdir = GETSYSCALL(host, CHDIR);
}
rv = op_chdir(path);
if (rv == 0)
pwdinrump = pt != PATH_HOST;
return rv;
}
int
fchdir(int fd)
{
int (*op_fchdir)(int);
bool isrump;
int rv;
if (fd_isrump(fd)) {
op_fchdir = GETSYSCALL(rump, FCHDIR);
isrump = true;
fd = fd_host2rump(fd);
} else {
op_fchdir = GETSYSCALL(host, FCHDIR);
isrump = false;
}
rv = op_fchdir(fd);
if (rv == 0) {
pwdinrump = isrump;
}
return rv;
}
#ifndef __linux__
int
__getcwd(char *bufp, size_t len)
{
int (*op___getcwd)(char *, size_t);
size_t prefixgap;
bool iamslash;
int rv;
if (pwdinrump && rumpprefix) {
if (rumpprefix[rumpprefixlen-1] == '/')
iamslash = true;
else
iamslash = false;
if (iamslash)
prefixgap = rumpprefixlen - 1; /* ``//+path'' */
else
prefixgap = rumpprefixlen; /* ``/pfx+/path'' */
if (len <= prefixgap) {
errno = ERANGE;
return -1;
}
op___getcwd = GETSYSCALL(rump, __GETCWD);
rv = op___getcwd(bufp + prefixgap, len - prefixgap);
if (rv == -1)
return rv;
/* augment the "/" part only for a non-root path */
memcpy(bufp, rumpprefix, rumpprefixlen);
/* append / only to non-root cwd */
if (rv != 2)
bufp[prefixgap] = '/';
/* don't append extra slash in the purely-slash case */
if (rv == 2 && !iamslash)
bufp[rumpprefixlen] = '\0';
} else if (pwdinrump) {
/* assume blanket. we can't provide a prefix here */
op___getcwd = GETSYSCALL(rump, __GETCWD);
rv = op___getcwd(bufp, len);
} else {
op___getcwd = GETSYSCALL(host, __GETCWD);
rv = op___getcwd(bufp, len);
}
return rv;
}
#endif
static int
moveish(const char *from, const char *to,
int (*rump_op)(const char *, const char *),
int (*host_op)(const char *, const char *))
{
int (*op)(const char *, const char *);
enum pathtype ptf, ptt;
if ((ptf = path_isrump(from)) != PATH_HOST) {
if ((ptt = path_isrump(to)) == PATH_HOST) {
errno = EXDEV;
return -1;
}
if (ptf == PATH_RUMP)
from = path_host2rump(from);
if (ptt == PATH_RUMP)
to = path_host2rump(to);
op = rump_op;
} else {
if (path_isrump(to) != PATH_HOST) {
errno = EXDEV;
return -1;
}
op = host_op;
}
return op(from, to);
}
int
link(const char *from, const char *to)
{
return moveish(from, to,
GETSYSCALL(rump, LINK), GETSYSCALL(host, LINK));
}
int
rename(const char *from, const char *to)
{
return moveish(from, to,
GETSYSCALL(rump, RENAME), GETSYSCALL(host, RENAME));
}
int
REALSOCKET(int domain, int type, int protocol)
{
int (*op_socket)(int, int, int);
int fd;
bool isrump;
isrump = domain < PF_MAX && rumpsockets[domain];
if (isrump)
op_socket = GETSYSCALL(rump, SOCKET);
else
op_socket = GETSYSCALL(host, SOCKET);
fd = op_socket(domain, type, protocol);
if (isrump)
fd = fd_rump2host(fd);
else
fd = fd_host2host(fd);
DPRINTF(("socket <- %d\n", fd));
return fd;
}
int
accept(int s, struct sockaddr *addr, socklen_t *addrlen)
{
int (*op_accept)(int, struct sockaddr *, socklen_t *);
int fd;
bool isrump;
isrump = fd_isrump(s);
DPRINTF(("accept -> %d", s));
if (isrump) {
op_accept = GETSYSCALL(rump, ACCEPT);
s = fd_host2rump(s);
} else {
op_accept = GETSYSCALL(host, ACCEPT);
}
fd = op_accept(s, addr, addrlen);
if (fd != -1 && isrump)
fd = fd_rump2host(fd);
else
fd = fd_host2host(fd);
DPRINTF((" <- %d\n", fd));
return fd;
}
/*
* ioctl() and fcntl() are varargs calls and need special treatment.
*/
/*
* Various [Linux] libc's have various signatures for ioctl so we
* need to handle the discrepancies. On NetBSD, we use the
* one with unsigned long cmd.
*/
int
#ifdef HAVE_IOCTL_CMD_INT
ioctl(int fd, int cmd, ...)
{
int (*op_ioctl)(int, int cmd, ...);
#else
ioctl(int fd, unsigned long cmd, ...)
{
int (*op_ioctl)(int, unsigned long cmd, ...);
#endif
va_list ap;
int rv;
DPRINTF(("ioctl -> %d\n", fd));
if (fd_isrump(fd)) {
fd = fd_host2rump(fd);
op_ioctl = GETSYSCALL(rump, IOCTL);
} else {
op_ioctl = GETSYSCALL(host, IOCTL);
}
va_start(ap, cmd);
rv = op_ioctl(fd, cmd, va_arg(ap, void *));
va_end(ap);
return rv;
}
int
fcntl(int fd, int cmd, ...)
{
int (*op_fcntl)(int, int, ...);
va_list ap;
int rv, minfd;
DPRINTF(("fcntl -> %d (cmd %d)\n", fd, cmd));
switch (cmd) {
case F_DUPFD:
va_start(ap, cmd);
minfd = va_arg(ap, int);
va_end(ap);
return dodup(fd, minfd);
#ifdef F_CLOSEM
case F_CLOSEM: {
int maxdup2, i;
/*
* So, if fd < HIJACKOFF, we want to do a host closem.
*/
if (fd < hijack_fdoff) {
int closemfd = fd;
if (rumpclient__closenotify(&closemfd,
RUMPCLIENT_CLOSE_FCLOSEM) == -1)
return -1;
op_fcntl = GETSYSCALL(host, FCNTL);
rv = op_fcntl(closemfd, cmd);
if (rv)
return rv;
}
/*
* Additionally, we want to do a rump closem, but only
* for the file descriptors not dup2'd.
*/
for (i = 0, maxdup2 = -1; i <= DUP2HIGH; i++) {
if (dup2vec[i] & DUP2BIT) {
int val;
val = dup2vec[i] & DUP2FDMASK;
maxdup2 = MAX(val, maxdup2);
}
}
if (fd >= hijack_fdoff)
fd -= hijack_fdoff;
else
fd = 0;
fd = MAX(maxdup2+1, fd);
/* hmm, maybe we should close rump fd's not within dup2mask? */
return rump_sys_fcntl(fd, F_CLOSEM);
}
#endif /* F_CLOSEM */
#ifdef F_MAXFD
case F_MAXFD:
/*
* For maxfd, if there's a rump kernel fd, return
* it hostified. Otherwise, return host's MAXFD
* return value.
*/
if ((rv = rump_sys_fcntl(fd, F_MAXFD)) != -1) {
/*
* This might go a little wrong in case
* of dup2 to [012], but I'm not sure if
* there's a justification for tracking
* that info. Consider e.g.
* dup2(rumpfd, 2) followed by rump_sys_open()
* returning 1. We should return 1+HIJACKOFF,
* not 2+HIJACKOFF. However, if [01] is not
* open, the correct return value is 2.
*/
return fd_rump2host(fd);
} else {
op_fcntl = GETSYSCALL(host, FCNTL);
return op_fcntl(fd, F_MAXFD);
}
/*NOTREACHED*/
#endif /* F_MAXFD */
default:
if (fd_isrump(fd)) {
fd = fd_host2rump(fd);
op_fcntl = GETSYSCALL(rump, FCNTL);
} else {
op_fcntl = GETSYSCALL(host, FCNTL);
}
va_start(ap, cmd);
rv = op_fcntl(fd, cmd, va_arg(ap, void *));
va_end(ap);
return rv;
}
/*NOTREACHED*/
}
int
close(int fd)
{
int (*op_close)(int);
int rv;
DPRINTF(("close -> %d\n", fd));
if (fd_isrump(fd)) {
bool undup2 = false;
int ofd;
if (isdup2d(ofd = fd)) {
undup2 = true;
}
fd = fd_host2rump(fd);
if (!undup2 && killdup2alias(fd)) {
return 0;
}
op_close = GETSYSCALL(rump, CLOSE);
rv = op_close(fd);
if (rv == 0 && undup2) {
clrdup2(ofd);
}
} else {
if (rumpclient__closenotify(&fd, RUMPCLIENT_CLOSE_CLOSE) == -1)
return -1;
op_close = GETSYSCALL(host, CLOSE);
rv = op_close(fd);
}
return rv;
}
/*
* write cannot issue a standard debug printf due to recursion
*/
ssize_t
write(int fd, const void *buf, size_t blen)
{
ssize_t (*op_write)(int, const void *, size_t);
if (fd_isrump(fd)) {
fd = fd_host2rump(fd);
op_write = GETSYSCALL(rump, WRITE);
} else {
op_write = GETSYSCALL(host, WRITE);
}
return op_write(fd, buf, blen);
}
/*
* file descriptor passing
*
* we intercept sendmsg and recvmsg to convert file descriptors in
* control messages. an attempt to send a descriptor from a different kernel
* is rejected. (ENOTSUP)
*/
static int
msg_convert(struct msghdr *msg, int (*func)(int))
{
struct cmsghdr *cmsg;
for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL;
cmsg = CMSG_NXTHDR(msg, cmsg)) {
if (cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SCM_RIGHTS) {
int *fdp = (void *)CMSG_DATA(cmsg);
const size_t size =
cmsg->cmsg_len - __CMSG_ALIGN(sizeof(*cmsg));
const int nfds = (int)(size / sizeof(int));
const int * const efdp = fdp + nfds;
while (fdp < efdp) {
const int newval = func(*fdp);
if (newval < 0) {
return ENOTSUP;
}
*fdp = newval;
fdp++;
}
}
}
return 0;
}
ssize_t
recvmsg(int fd, struct msghdr *msg, int flags)
{
ssize_t (*op_recvmsg)(int, struct msghdr *, int);
ssize_t ret;
const bool isrump = fd_isrump(fd);
if (isrump) {
fd = fd_host2rump(fd);
op_recvmsg = GETSYSCALL(rump, RECVMSG);
} else {
op_recvmsg = GETSYSCALL(host, RECVMSG);
}
ret = op_recvmsg(fd, msg, flags);
if (ret == -1) {
return ret;
}
/*
* convert descriptors in the message.
*/
if (isrump) {
msg_convert(msg, fd_rump2host);
} else {
msg_convert(msg, fd_host2host);
}
return ret;
}
ssize_t
recv(int fd, void *buf, size_t len, int flags)
{
return recvfrom(fd, buf, len, flags, NULL, NULL);
}
ssize_t
send(int fd, const void *buf, size_t len, int flags)
{
return sendto(fd, buf, len, flags, NULL, 0);
}
static int
fd_check_rump(int fd)
{
return fd_isrump(fd) ? 0 : -1;
}
static int
fd_check_host(int fd)
{
return !fd_isrump(fd) ? 0 : -1;
}
ssize_t
sendmsg(int fd, const struct msghdr *msg, int flags)
{
ssize_t (*op_sendmsg)(int, const struct msghdr *, int);
const bool isrump = fd_isrump(fd);
int error;
/*
* reject descriptors from a different kernel.
*/
error = msg_convert(__UNCONST(msg),
isrump ? fd_check_rump: fd_check_host);
if (error != 0) {
errno = error;
return -1;
}
/*
* convert descriptors in the message to raw values.
*/
if (isrump) {
fd = fd_host2rump(fd);
/*
* XXX we directly modify the given message assuming:
* - cmsg is writable (typically on caller's stack)
* - caller don't care cmsg's contents after calling sendmsg.
* (thus no need to restore values)
*
* it's safer to copy and modify instead.
*/
msg_convert(__UNCONST(msg), fd_host2rump);
op_sendmsg = GETSYSCALL(rump, SENDMSG);
} else {
op_sendmsg = GETSYSCALL(host, SENDMSG);
}
return op_sendmsg(fd, msg, flags);
}
/*
* dup2 is special. we allow dup2 of a rump kernel fd to 0-2 since
* many programs do that. dup2 of a rump kernel fd to another value
* not >= fdoff is an error.
*
* Note: cannot rump2host newd, because it is often hardcoded.
*/
int
dup2(int oldd, int newd)
{
int (*host_dup2)(int, int);
int rv;
DPRINTF(("dup2 -> %d (o) -> %d (n)\n", oldd, newd));
if (fd_isrump(oldd)) {
int (*op_close)(int) = GETSYSCALL(host, CLOSE);
/* only allow fd 0-2 for cross-kernel dup */
if (!(newd >= 0 && newd <= 2 && !fd_isrump(newd))) {
errno = EBADF;
return -1;
}
/* regular dup2? */
if (fd_isrump(newd)) {
newd = fd_host2rump(newd);
rv = rump_sys_dup2(oldd, newd);
return fd_rump2host(rv);
}
/*
* dup2 rump => host? just establish an
* entry in the mapping table.
*/
op_close(newd);
setdup2(newd, fd_host2rump(oldd));
rv = 0;
} else {
host_dup2 = syscalls[DUALCALL_DUP2].bs_host;
if (rumpclient__closenotify(&newd, RUMPCLIENT_CLOSE_DUP2) == -1)
return -1;
rv = host_dup2(oldd, newd);
}
return rv;
}
int
dup(int oldd)
{
return dodup(oldd, 0);
}
pid_t
fork(void)
{
pid_t rv;
DPRINTF(("fork\n"));
rv = rumpclient__dofork(host_fork);
DPRINTF(("fork returns %d\n", rv));
return rv;
}
#ifdef VFORK
/* we do not have the luxury of not requiring a stackframe */
__strong_alias(VFORK,fork);
#endif
int
daemon(int nochdir, int noclose)
{
struct rumpclient_fork *rf;
if ((rf = rumpclient_prefork()) == NULL)
return -1;
if (host_daemon(nochdir, noclose) == -1)
return -1;
if (rumpclient_fork_init(rf) == -1)
return -1;
return 0;
}
int
execve(const char *path, char *const argv[], char *const envp[])
{
char buf[128];
char *dup2str;
const char *pwdinrumpstr;
char **newenv;
size_t nelem;
int rv, sverrno;
int bonus = 2, i = 0;
snprintf(buf, sizeof(buf), "RUMPHIJACK__DUP2INFO=%u,%u,%u",
dup2vec[0], dup2vec[1], dup2vec[2]);
dup2str = strdup(buf);
if (dup2str == NULL) {
errno = ENOMEM;
return -1;
}
if (pwdinrump) {
pwdinrumpstr = "RUMPHIJACK__PWDINRUMP=true";
bonus++;
} else {
pwdinrumpstr = NULL;
}
for (nelem = 0; envp && envp[nelem]; nelem++)
continue;
newenv = malloc(sizeof(*newenv) * (nelem+bonus));
if (newenv == NULL) {
free(dup2str);
errno = ENOMEM;
return -1;
}
memcpy(newenv, envp, nelem*sizeof(*newenv));
newenv[nelem+i] = dup2str;
i++;
if (pwdinrumpstr) {
newenv[nelem+i] = __UNCONST(pwdinrumpstr);
i++;
}
newenv[nelem+i] = NULL;
_DIAGASSERT(i < bonus);
rv = rumpclient_exec(path, argv, newenv);
_DIAGASSERT(rv != 0);
sverrno = errno;
free(newenv);
free(dup2str);
errno = sverrno;
return rv;
}
/*
* select is done by calling poll.
*/
int
REALSELECT(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
struct timeval *timeout)
{
struct pollfd *pfds;
struct timespec ts, *tsp = NULL;
nfds_t realnfds;
int i, j;
int rv, incr;
DPRINTF(("select %d %p %p %p %p\n", nfds,
readfds, writefds, exceptfds, timeout));
/*
* Well, first we must scan the fds to figure out how many
* fds there really are. This is because up to and including
* nb5 poll() silently refuses nfds > process_maxopen_fds.
* Seems to be fixed in current, thank the maker.
* god damn cluster...bomb.
*/
for (i = 0, realnfds = 0; i < nfds; i++) {
if (readfds && FD_ISSET(i, readfds)) {
realnfds++;
continue;
}
if (writefds && FD_ISSET(i, writefds)) {
realnfds++;
continue;
}
if (exceptfds && FD_ISSET(i, exceptfds)) {
realnfds++;
continue;
}
}
if (realnfds) {
pfds = calloc(realnfds, sizeof(*pfds));
if (!pfds)
return -1;
} else {
pfds = NULL;
}
for (i = 0, j = 0; i < nfds; i++) {
incr = 0;
if (readfds && FD_ISSET(i, readfds)) {
pfds[j].fd = i;
pfds[j].events |= POLLIN;
incr=1;
}
if (writefds && FD_ISSET(i, writefds)) {
pfds[j].fd = i;
pfds[j].events |= POLLOUT;
incr=1;
}
if (exceptfds && FD_ISSET(i, exceptfds)) {
pfds[j].fd = i;
pfds[j].events |= POLLHUP|POLLERR;
incr=1;
}
if (incr)
j++;
}
assert(j == (int)realnfds);
if (timeout) {
TIMEVAL_TO_TIMESPEC(timeout, &ts);
tsp = &ts;
}
rv = REALPOLLTS(pfds, realnfds, tsp, NULL);
/*
* "If select() returns with an error the descriptor sets
* will be unmodified"
*/
if (rv < 0)
goto out;
/*
* zero out results (can't use FD_ZERO for the
* obvious select-me-not reason). whee.
*
* We do this here since some software ignores the return
* value of select, and hence if the timeout expires, it may
* assume all input descriptors have activity.
*/
for (i = 0; i < nfds; i++) {
if (readfds)
FD_CLR(i, readfds);
if (writefds)
FD_CLR(i, writefds);
if (exceptfds)
FD_CLR(i, exceptfds);
}
if (rv == 0)
goto out;
/*
* We have >0 fds with activity. Harvest the results.
*/
for (i = 0; i < (int)realnfds; i++) {
if (readfds) {
if (pfds[i].revents & POLLIN) {
FD_SET(pfds[i].fd, readfds);
}
}
if (writefds) {
if (pfds[i].revents & POLLOUT) {
FD_SET(pfds[i].fd, writefds);
}
}
if (exceptfds) {
if (pfds[i].revents & (POLLHUP|POLLERR)) {
FD_SET(pfds[i].fd, exceptfds);
}
}
}
out:
free(pfds);
return rv;
}
static void
checkpoll(struct pollfd *fds, nfds_t nfds, int *hostcall, int *rumpcall)
{
nfds_t i;
for (i = 0; i < nfds; i++) {
if (fds[i].fd == -1)
continue;
if (fd_isrump(fds[i].fd))
(*rumpcall)++;
else
(*hostcall)++;
}
}
static void
adjustpoll(struct pollfd *fds, nfds_t nfds, int (*fdadj)(int))
{
nfds_t i;
for (i = 0; i < nfds; i++) {
fds[i].fd = fdadj(fds[i].fd);
}
}
/*
* poll is easy as long as the call comes in the fds only in one
* kernel. otherwise its quite tricky...
*/
struct pollarg {
struct pollfd *pfds;
nfds_t nfds;
const struct timespec *ts;
const sigset_t *sigmask;
int pipefd;
int errnum;
};
static void *
hostpoll(void *arg)
{
int (*op_pollts)(struct pollfd *, nfds_t, const struct timespec *,
const sigset_t *);
struct pollarg *parg = arg;
intptr_t rv;
op_pollts = GETSYSCALL(host, POLLTS);
rv = op_pollts(parg->pfds, parg->nfds, parg->ts, parg->sigmask);
if (rv == -1)
parg->errnum = errno;
rump_sys_write(parg->pipefd, &rv, sizeof(rv));
return (void *)rv;
}
int
REALPOLLTS(struct pollfd *fds, nfds_t nfds, const struct timespec *ts,
const sigset_t *sigmask)
{
int (*op_pollts)(struct pollfd *, nfds_t, const struct timespec *,
const sigset_t *);
int (*host_close)(int);
int hostcall = 0, rumpcall = 0;
pthread_t pt;
nfds_t i;
int rv;
DPRINTF(("poll %p %d %p %p\n", fds, (int)nfds, ts, sigmask));
checkpoll(fds, nfds, &hostcall, &rumpcall);
if (hostcall && rumpcall) {
struct pollfd *pfd_host = NULL, *pfd_rump = NULL;
int rpipe[2] = {-1,-1}, hpipe[2] = {-1,-1};
struct pollarg parg;
void *trv_val;
int sverrno = 0, rv_rump, rv_host, errno_rump, errno_host;
/*
* ok, this is where it gets tricky. We must support
* this since it's a very common operation in certain
* types of software (telnet, netcat, etc). We allocate
* two vectors and run two poll commands in separate
* threads. Whichever returns first "wins" and the
* other kernel's fds won't show activity.
*/
rv = -1;
/* allocate full vector for O(n) joining after call */
pfd_host = malloc(sizeof(*pfd_host)*(nfds+1));
if (!pfd_host)
goto out;
pfd_rump = malloc(sizeof(*pfd_rump)*(nfds+1));
if (!pfd_rump) {
goto out;
}
/*
* then, open two pipes, one for notifications
* to each kernel.
*
* At least the rump pipe should probably be
* cached, along with the helper threads. This
* should give a microbenchmark improvement (haven't
* experienced a macro-level problem yet, though).
*/
if ((rv = rump_sys_pipe(rpipe)) == -1) {
sverrno = errno;
}
if (rv == 0 && (rv = pipe(hpipe)) == -1) {
sverrno = errno;
}
/* split vectors (or signal errors) */
for (i = 0; i < nfds; i++) {
int fd;
fds[i].revents = 0;
if (fds[i].fd == -1) {
pfd_host[i].fd = -1;
pfd_rump[i].fd = -1;
} else if (fd_isrump(fds[i].fd)) {
pfd_host[i].fd = -1;
fd = fd_host2rump(fds[i].fd);
if (fd == rpipe[0] || fd == rpipe[1]) {
fds[i].revents = POLLNVAL;
if (rv != -1)
rv++;
}
pfd_rump[i].fd = fd;
pfd_rump[i].events = fds[i].events;
} else {
pfd_rump[i].fd = -1;
fd = fds[i].fd;
if (fd == hpipe[0] || fd == hpipe[1]) {
fds[i].revents = POLLNVAL;
if (rv != -1)
rv++;
}
pfd_host[i].fd = fd;
pfd_host[i].events = fds[i].events;
}
pfd_rump[i].revents = pfd_host[i].revents = 0;
}
if (rv) {
goto out;
}
pfd_host[nfds].fd = hpipe[0];
pfd_host[nfds].events = POLLIN;
pfd_rump[nfds].fd = rpipe[0];
pfd_rump[nfds].events = POLLIN;
/*
* then, create a thread to do host part and meanwhile
* do rump kernel part right here
*/
parg.pfds = pfd_host;
parg.nfds = nfds+1;
parg.ts = ts;
parg.sigmask = sigmask;
parg.pipefd = rpipe[1];
pthread_create(&pt, NULL, hostpoll, &parg);
op_pollts = GETSYSCALL(rump, POLLTS);
rv_rump = op_pollts(pfd_rump, nfds+1, ts, NULL);
errno_rump = errno;
write(hpipe[1], &rv, sizeof(rv));
pthread_join(pt, &trv_val);
rv_host = (int)(intptr_t)trv_val;
errno_host = parg.errnum;
/* strip cross-thread notification from real results */
if (rv_host > 0 && pfd_host[nfds].revents & POLLIN) {
rv_host--;
}
if (rv_rump > 0 && pfd_rump[nfds].revents & POLLIN) {
rv_rump--;
}
/* then merge the results into what's reported to the caller */
if (rv_rump > 0 || rv_host > 0) {
/* SUCCESS */
rv = 0;
if (rv_rump > 0) {
for (i = 0; i < nfds; i++) {
if (pfd_rump[i].fd != -1)
fds[i].revents
= pfd_rump[i].revents;
}
rv += rv_rump;
}
if (rv_host > 0) {
for (i = 0; i < nfds; i++) {
if (pfd_host[i].fd != -1)
fds[i].revents
= pfd_host[i].revents;
}
rv += rv_host;
}
assert(rv > 0);
sverrno = 0;
} else if (rv_rump == -1 || rv_host == -1) {
/* ERROR */
/* just pick one kernel at "random" */
rv = -1;
if (rv_host == -1) {
sverrno = errno_host;
} else if (rv_rump == -1) {
sverrno = errno_rump;
}
} else {
/* TIMEOUT */
rv = 0;
assert(rv_rump == 0 && rv_host == 0);
}
out:
host_close = GETSYSCALL(host, CLOSE);
if (rpipe[0] != -1)
rump_sys_close(rpipe[0]);
if (rpipe[1] != -1)
rump_sys_close(rpipe[1]);
if (hpipe[0] != -1)
host_close(hpipe[0]);
if (hpipe[1] != -1)
host_close(hpipe[1]);
free(pfd_host);
free(pfd_rump);
errno = sverrno;
} else {
if (hostcall) {
op_pollts = GETSYSCALL(host, POLLTS);
} else {
op_pollts = GETSYSCALL(rump, POLLTS);
adjustpoll(fds, nfds, fd_host2rump);
}
rv = op_pollts(fds, nfds, ts, sigmask);
if (rumpcall)
adjustpoll(fds, nfds, fd_rump2host_withdup);
}
return rv;
}
int
poll(struct pollfd *fds, nfds_t nfds, int timeout)
{
struct timespec ts;
struct timespec *tsp = NULL;
if (timeout != INFTIM) {
ts.tv_sec = timeout / 1000;
ts.tv_nsec = (timeout % 1000) * 1000*1000;
tsp = &ts;
}
return REALPOLLTS(fds, nfds, tsp, NULL);
}
#ifdef PLATFORM_HAS_KQUEUE
int
REALKEVENT(int kq, const struct kevent *changelist, size_t nchanges,
struct kevent *eventlist, size_t nevents,
const struct timespec *timeout)
{
int (*op_kevent)(int, const struct kevent *, size_t,
struct kevent *, size_t, const struct timespec *);
const struct kevent *ev;
size_t i;
/*
* Check that we don't attempt to kevent rump kernel fd's.
* That needs similar treatment to select/poll, but is slightly
* trickier since we need to manage to different kq descriptors.
* (TODO, in case you're wondering).
*/
for (i = 0; i < nchanges; i++) {
ev = &changelist[i];
if (ev->filter == EVFILT_READ || ev->filter == EVFILT_WRITE ||
ev->filter == EVFILT_VNODE) {
if (fd_isrump((int)ev->ident)) {
errno = ENOTSUP;
return -1;
}
}
}
op_kevent = GETSYSCALL(host, KEVENT);
return op_kevent(kq, changelist, nchanges, eventlist, nevents, timeout);
}
#endif /* PLATFORM_HAS_KQUEUE */
/*
* mmapping from a rump kernel is not supported, so disallow it.
*/
void *
mmap(void *addr, size_t len, int prot, int flags, int fd, off_t offset)
{
if (flags & MAP_FILE && fd_isrump(fd)) {
errno = ENOSYS;
return MAP_FAILED;
}
return host_mmap(addr, len, prot, flags, fd, offset);
}
#ifdef PLATFORM_HAS_NBSYSCTL
/*
* these go to one or the other on a per-process configuration
*/
int __sysctl(const int *, unsigned int, void *, size_t *, const void *, size_t);
int
__sysctl(const int *name, unsigned int namelen, void *old, size_t *oldlenp,
const void *new, size_t newlen)
{
int (*op___sysctl)(const int *, unsigned int, void *, size_t *,
const void *, size_t);
if (rumpsysctl) {
op___sysctl = GETSYSCALL(rump, __SYSCTL);
} else {
op___sysctl = GETSYSCALL(host, __SYSCTL);
/* we haven't inited yet */
if (__predict_false(op___sysctl == NULL)) {
op___sysctl = rumphijack_dlsym(RTLD_NEXT, "__sysctl");
}
}
return op___sysctl(name, namelen, old, oldlenp, new, newlen);
}
#endif
/*
* Rest are std type calls.
*/
ATCALL(int, utimensat, DUALCALL_UTIMENSAT, \
(int fd, const char *path, const struct timespec t[2], int f), \
(int, const char *, const struct timespec [2], int),
(fd, path, t, f))
FDCALL(int, bind, DUALCALL_BIND, \
(int fd, const struct sockaddr *name, socklen_t namelen), \
(int, const struct sockaddr *, socklen_t), \
(fd, name, namelen))
FDCALL(int, connect, DUALCALL_CONNECT, \
(int fd, const struct sockaddr *name, socklen_t namelen), \
(int, const struct sockaddr *, socklen_t), \
(fd, name, namelen))
FDCALL(int, getpeername, DUALCALL_GETPEERNAME, \
(int fd, struct sockaddr *name, socklen_t *namelen), \
(int, struct sockaddr *, socklen_t *), \
(fd, name, namelen))
FDCALL(int, getsockname, DUALCALL_GETSOCKNAME, \
(int fd, struct sockaddr *name, socklen_t *namelen), \
(int, struct sockaddr *, socklen_t *), \
(fd, name, namelen))
FDCALL(int, listen, DUALCALL_LISTEN, \
(int fd, int backlog), \
(int, int), \
(fd, backlog))
FDCALL(ssize_t, recvfrom, DUALCALL_RECVFROM, \
(int fd, void *buf, size_t len, int flags, \
struct sockaddr *from, socklen_t *fromlen), \
(int, void *, size_t, int, struct sockaddr *, socklen_t *), \
(fd, buf, len, flags, from, fromlen))
FDCALL(ssize_t, sendto, DUALCALL_SENDTO, \
(int fd, const void *buf, size_t len, int flags, \
const struct sockaddr *to, socklen_t tolen), \
(int, const void *, size_t, int, \
const struct sockaddr *, socklen_t), \
(fd, buf, len, flags, to, tolen))
FDCALL(int, getsockopt, DUALCALL_GETSOCKOPT, \
(int fd, int level, int optn, void *optval, socklen_t *optlen), \
(int, int, int, void *, socklen_t *), \
(fd, level, optn, optval, optlen))
FDCALL(int, setsockopt, DUALCALL_SETSOCKOPT, \
(int fd, int level, int optn, \
const void *optval, socklen_t optlen), \
(int, int, int, const void *, socklen_t), \
(fd, level, optn, optval, optlen))
FDCALL(int, shutdown, DUALCALL_SHUTDOWN, \
(int fd, int how), \
(int, int), \
(fd, how))
FDCALL(ssize_t, REALREAD, DUALCALL_READ, \
(int fd, void *buf, size_t buflen), \
(int, void *, size_t), \
(fd, buf, buflen))
#ifdef __linux__
ssize_t __read_chk(int, void *, size_t)
__attribute__((alias("read")));
#endif
FDCALL(ssize_t, readv, DUALCALL_READV, \
(int fd, const struct iovec *iov, int iovcnt), \
(int, const struct iovec *, int), \
(fd, iov, iovcnt))
FDCALL(ssize_t, REALPREAD, DUALCALL_PREAD, \
(int fd, void *buf, size_t nbytes, off_t offset), \
(int, void *, size_t, off_t), \
(fd, buf, nbytes, offset))
FDCALL(ssize_t, preadv, DUALCALL_PREADV, \
(int fd, const struct iovec *iov, int iovcnt, off_t offset), \
(int, const struct iovec *, int, off_t), \
(fd, iov, iovcnt, offset))
FDCALL(ssize_t, writev, DUALCALL_WRITEV, \
(int fd, const struct iovec *iov, int iovcnt), \
(int, const struct iovec *, int), \
(fd, iov, iovcnt))
FDCALL(ssize_t, REALPWRITE, DUALCALL_PWRITE, \
(int fd, const void *buf, size_t nbytes, off_t offset), \
(int, const void *, size_t, off_t), \
(fd, buf, nbytes, offset))
FDCALL(ssize_t, pwritev, DUALCALL_PWRITEV, \
(int fd, const struct iovec *iov, int iovcnt, off_t offset), \
(int, const struct iovec *, int, off_t), \
(fd, iov, iovcnt, offset))
#ifndef __linux__
FDCALL(int, REALFSTAT, DUALCALL_FSTAT, \
(int fd, struct stat *sb), \
(int, struct stat *), \
(fd, sb))
#endif
#ifdef PLATFORM_HAS_NBVFSSTAT
FDCALL(int, fstatvfs1, DUALCALL_FSTATVFS1, \
(int fd, struct statvfs *buf, int flags), \
(int, struct statvfs *, int), \
(fd, buf, flags))
#endif
FDCALL(off_t, lseek, DUALCALL_LSEEK, \
(int fd, off_t offset, int whence), \
(int, off_t, int), \
(fd, offset, whence))
#ifdef LSEEK_ALIAS
__strong_alias(LSEEK_ALIAS,lseek);
#endif
#ifndef __linux__
FDCALL(int, REALGETDENTS, DUALCALL_GETDENTS, \
(int fd, char *buf, size_t nbytes), \
(int, char *, size_t), \
(fd, buf, nbytes))
#endif
FDCALL(int, fchown, DUALCALL_FCHOWN, \
(int fd, uid_t owner, gid_t group), \
(int, uid_t, gid_t), \
(fd, owner, group))
FDCALL(int, fchmod, DUALCALL_FCHMOD, \
(int fd, mode_t mode), \
(int, mode_t), \
(fd, mode))
FDCALL(int, ftruncate, DUALCALL_FTRUNCATE, \
(int fd, off_t length), \
(int, off_t), \
(fd, length))
FDCALL(int, fsync, DUALCALL_FSYNC, \
(int fd), \
(int), \
(fd))
#ifdef PLATFORM_HAS_FSYNC_RANGE
FDCALL(int, fsync_range, DUALCALL_FSYNC_RANGE, \
(int fd, int how, off_t start, off_t length), \
(int, int, off_t, off_t), \
(fd, how, start, length))
#endif
FDCALL(int, futimes, DUALCALL_FUTIMES, \
(int fd, const struct timeval *tv), \
(int, const struct timeval *), \
(fd, tv))
#ifdef PLATFORM_HAS_CHFLAGS
FDCALL(int, fchflags, DUALCALL_FCHFLAGS, \
(int fd, u_long flags), \
(int, u_long), \
(fd, flags))
#endif
/*
* path-based selectors
*/
#ifndef __linux__
PATHCALL(int, REALSTAT, DUALCALL_STAT, \
(const char *path, struct stat *sb), \
(const char *, struct stat *), \
(path, sb))
PATHCALL(int, REALLSTAT, DUALCALL_LSTAT, \
(const char *path, struct stat *sb), \
(const char *, struct stat *), \
(path, sb))
#endif
PATHCALL(int, chown, DUALCALL_CHOWN, \
(const char *path, uid_t owner, gid_t group), \
(const char *, uid_t, gid_t), \
(path, owner, group))
PATHCALL(int, lchown, DUALCALL_LCHOWN, \
(const char *path, uid_t owner, gid_t group), \
(const char *, uid_t, gid_t), \
(path, owner, group))
PATHCALL(int, chmod, DUALCALL_CHMOD, \
(const char *path, mode_t mode), \
(const char *, mode_t), \
(path, mode))
PATHCALL(int, lchmod, DUALCALL_LCHMOD, \
(const char *path, mode_t mode), \
(const char *, mode_t), \
(path, mode))
#ifdef PLATFORM_HAS_NBVFSSTAT
PATHCALL(int, statvfs1, DUALCALL_STATVFS1, \
(const char *path, struct statvfs *buf, int flags), \
(const char *, struct statvfs *, int), \
(path, buf, flags))
#endif
PATHCALL(int, unlink, DUALCALL_UNLINK, \
(const char *path), \
(const char *), \
(path))
PATHCALL(int, symlink, DUALCALL_SYMLINK, \
(const char *target, const char *path), \
(const char *, const char *), \
(target, path))
/*
* readlink() can be called from malloc which can be called
* from dlsym() during init
*/
ssize_t
readlink(const char *path, char *buf, size_t bufsiz)
{
int (*op_readlink)(const char *, char *, size_t);
enum pathtype pt;
if ((pt = path_isrump(path)) != PATH_HOST) {
op_readlink = GETSYSCALL(rump, READLINK);
if (pt == PATH_RUMP)
path = path_host2rump(path);
} else {
op_readlink = GETSYSCALL(host, READLINK);
}
if (__predict_false(op_readlink == NULL)) {
errno = ENOENT;
return -1;
}
return op_readlink(path, buf, bufsiz);
}
PATHCALL(int, mkdir, DUALCALL_MKDIR, \
(const char *path, mode_t mode), \
(const char *, mode_t), \
(path, mode))
PATHCALL(int, rmdir, DUALCALL_RMDIR, \
(const char *path), \
(const char *), \
(path))
PATHCALL(int, utimes, DUALCALL_UTIMES, \
(const char *path, const struct timeval *tv), \
(const char *, const struct timeval *), \
(path, tv))
PATHCALL(int, lutimes, DUALCALL_LUTIMES, \
(const char *path, const struct timeval *tv), \
(const char *, const struct timeval *), \
(path, tv))
#ifdef PLATFORM_HAS_CHFLAGS
PATHCALL(int, chflags, DUALCALL_CHFLAGS, \
(const char *path, u_long flags), \
(const char *, u_long), \
(path, flags))
PATHCALL(int, lchflags, DUALCALL_LCHFLAGS, \
(const char *path, u_long flags), \
(const char *, u_long), \
(path, flags))
#endif /* PLATFORM_HAS_CHFLAGS */
PATHCALL(int, truncate, DUALCALL_TRUNCATE, \
(const char *path, off_t length), \
(const char *, off_t), \
(path, length))
PATHCALL(int, access, DUALCALL_ACCESS, \
(const char *path, int mode), \
(const char *, int), \
(path, mode))
#ifndef __linux__
PATHCALL(int, REALMKNOD, DUALCALL_MKNOD, \
(const char *path, mode_t mode, dev_t dev), \
(const char *, mode_t, dev_t), \
(path, mode, dev))
#endif
/*
* Note: with mount the decisive parameter is the mount
* destination directory. This is because we don't really know
* about the "source" directory in a generic call (and besides,
* it might not even exist, cf. nfs).
*/
#ifdef PLATFORM_HAS_NBMOUNT
PATHCALL(int, REALMOUNT, DUALCALL_MOUNT, \
(const char *type, const char *path, int flags, \
void *data, size_t dlen), \
(const char *, const char *, int, void *, size_t), \
(type, path, flags, data, dlen))
PATHCALL(int, unmount, DUALCALL_UNMOUNT, \
(const char *path, int flags), \
(const char *, int), \
(path, flags))
#endif /* PLATFORM_HAS_NBMOUNT */
#ifdef PLATFORM_HAS_NBQUOTA
#if __NetBSD_Prereq__(5,99,63)
PATHCALL(int, __quotactl, DUALCALL_QUOTACTL, \
(const char *path, struct quotactl_args *args), \
(const char *, struct quotactl_args *), \
(path, args))
#elif __NetBSD_Prereq__(5,99,48)
PATHCALL(int, OLDREALQUOTACTL, DUALCALL_QUOTACTL, \
(const char *path, struct plistref *p), \
(const char *, struct plistref *), \
(path, p))
#endif
#endif /* PLATFORM_HAS_NBQUOTA */
#ifdef PLATFORM_HAS_NBFILEHANDLE
PATHCALL(int, REALGETFH, DUALCALL_GETFH, \
(const char *path, void *fhp, size_t *fh_size), \
(const char *, void *, size_t *), \
(path, fhp, fh_size))
#endif
/*
* These act different on a per-process vfs configuration
*/
#ifdef PLATFORM_HAS_NBVFSSTAT
VFSCALL(VFSBIT_GETVFSSTAT, int, getvfsstat, DUALCALL_GETVFSSTAT, \
(struct statvfs *buf, size_t buflen, int flags), \
(struct statvfs *, size_t, int), \
(buf, buflen, flags))
#endif
#ifdef PLATFORM_HAS_NBFILEHANDLE
VFSCALL(VFSBIT_FHCALLS, int, REALFHOPEN, DUALCALL_FHOPEN, \
(const void *fhp, size_t fh_size, int flags), \
(const char *, size_t, int), \
(fhp, fh_size, flags))
VFSCALL(VFSBIT_FHCALLS, int, REALFHSTAT, DUALCALL_FHSTAT, \
(const void *fhp, size_t fh_size, struct stat *sb), \
(const char *, size_t, struct stat *), \
(fhp, fh_size, sb))
VFSCALL(VFSBIT_FHCALLS, int, REALFHSTATVFS1, DUALCALL_FHSTATVFS1, \
(const void *fhp, size_t fh_size, struct statvfs *sb, int flgs),\
(const char *, size_t, struct statvfs *, int), \
(fhp, fh_size, sb, flgs))
#endif
#ifdef PLATFORM_HAS_NFSSVC
/* finally, put nfssvc here. "keep the namespace clean" */
#include <nfs/rpcv2.h>
#include <nfs/nfs.h>
int
nfssvc(int flags, void *argstructp)
{
int (*op_nfssvc)(int, void *);
if (vfsbits & VFSBIT_NFSSVC){
struct nfsd_args *nfsdargs;
/* massage the socket descriptor if necessary */
if (flags == NFSSVC_ADDSOCK) {
nfsdargs = argstructp;
nfsdargs->sock = fd_host2rump(nfsdargs->sock);
}
op_nfssvc = GETSYSCALL(rump, NFSSVC);
} else
op_nfssvc = GETSYSCALL(host, NFSSVC);
return op_nfssvc(flags, argstructp);
}
#endif /* PLATFORM_HAS_NFSSVC */
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