591 lines
12 KiB
C
591 lines
12 KiB
C
/* $NetBSD: psbuf.c,v 1.19 2012/11/04 22:46:08 christos Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2006-2009 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 <sys/cdefs.h>
|
|
#ifndef lint
|
|
__RCSID("$NetBSD: psbuf.c,v 1.19 2012/11/04 22:46:08 christos Exp $");
|
|
#endif /* !lint */
|
|
|
|
/*
|
|
* buffering functions for network input/output. slightly different
|
|
* from the average joe buffer routines, as is usually the case ...
|
|
* these use efuns for now.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/time.h>
|
|
#include <sys/vnode.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <util.h>
|
|
#include <unistd.h>
|
|
|
|
#include "psshfs.h"
|
|
#include "sftp_proto.h"
|
|
|
|
#define FAILRV(x) do { int rv; if ((rv=x)) return (rv); } while (/*CONSTCOND*/0)
|
|
#define READSTATE_LENGTH(off) (off < 4)
|
|
|
|
#define SFTP_LENOFF 0
|
|
#define SFTP_TYPEOFF 4
|
|
#define SFTP_REQIDOFF 5
|
|
|
|
#define CHECK(v) if (!(v)) abort()
|
|
|
|
uint8_t
|
|
psbuf_get_type(struct puffs_framebuf *pb)
|
|
{
|
|
uint8_t type;
|
|
|
|
puffs_framebuf_getdata_atoff(pb, SFTP_TYPEOFF, &type, 1);
|
|
return type;
|
|
}
|
|
|
|
uint32_t
|
|
psbuf_get_len(struct puffs_framebuf *pb)
|
|
{
|
|
uint32_t len;
|
|
|
|
puffs_framebuf_getdata_atoff(pb, SFTP_LENOFF, &len, 4);
|
|
return be32toh(len);
|
|
}
|
|
|
|
uint32_t
|
|
psbuf_get_reqid(struct puffs_framebuf *pb)
|
|
{
|
|
uint32_t req;
|
|
|
|
puffs_framebuf_getdata_atoff(pb, SFTP_REQIDOFF, &req, 4);
|
|
return be32toh(req);
|
|
}
|
|
|
|
#define CUROFF(pb) (puffs_framebuf_telloff(pb))
|
|
int
|
|
psbuf_read(struct puffs_usermount *pu, struct puffs_framebuf *pb,
|
|
int fd, int *done)
|
|
{
|
|
void *win;
|
|
ssize_t n;
|
|
size_t howmuch, winlen;
|
|
int lenstate;
|
|
|
|
the_next_level:
|
|
if ((lenstate = READSTATE_LENGTH(CUROFF(pb))))
|
|
howmuch = 4 - CUROFF(pb);
|
|
else
|
|
howmuch = psbuf_get_len(pb) - (CUROFF(pb) - 4);
|
|
|
|
if (puffs_framebuf_reserve_space(pb, howmuch) == -1)
|
|
return errno;
|
|
|
|
while (howmuch) {
|
|
winlen = howmuch;
|
|
if (puffs_framebuf_getwindow(pb, CUROFF(pb), &win, &winlen)==-1)
|
|
return errno;
|
|
n = recv(fd, win, winlen, MSG_NOSIGNAL);
|
|
switch (n) {
|
|
case 0:
|
|
return ECONNRESET;
|
|
case -1:
|
|
if (errno == EAGAIN)
|
|
return 0;
|
|
return errno;
|
|
default:
|
|
howmuch -= n;
|
|
puffs_framebuf_seekset(pb, CUROFF(pb) + n);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!lenstate) {
|
|
/* XXX: initial exchange shorter.. but don't worry, be happy */
|
|
puffs_framebuf_seekset(pb, 9);
|
|
*done = 1;
|
|
return 0;
|
|
} else
|
|
goto the_next_level;
|
|
}
|
|
|
|
int
|
|
psbuf_write(struct puffs_usermount *pu, struct puffs_framebuf *pb,
|
|
int fd, int *done)
|
|
{
|
|
void *win;
|
|
ssize_t n;
|
|
size_t winlen, howmuch;
|
|
|
|
/* finalize buffer.. could be elsewhere ... */
|
|
if (CUROFF(pb) == 0) {
|
|
uint32_t len;
|
|
|
|
len = htobe32(puffs_framebuf_tellsize(pb) - 4);
|
|
puffs_framebuf_putdata_atoff(pb, 0, &len, 4);
|
|
}
|
|
|
|
howmuch = puffs_framebuf_tellsize(pb) - CUROFF(pb);
|
|
while (howmuch) {
|
|
winlen = howmuch;
|
|
if (puffs_framebuf_getwindow(pb, CUROFF(pb), &win, &winlen)==-1)
|
|
return errno;
|
|
n = send(fd, win, winlen, MSG_NOSIGNAL);
|
|
switch (n) {
|
|
case 0:
|
|
return ECONNRESET;
|
|
case -1:
|
|
if (errno == EAGAIN)
|
|
return 0;
|
|
return errno;
|
|
default:
|
|
howmuch -= n;
|
|
puffs_framebuf_seekset(pb, CUROFF(pb) + n);
|
|
break;
|
|
}
|
|
}
|
|
|
|
*done = 1;
|
|
return 0;
|
|
}
|
|
#undef CUROFF
|
|
|
|
int
|
|
psbuf_cmp(struct puffs_usermount *pu,
|
|
struct puffs_framebuf *cmp1, struct puffs_framebuf *cmp2, int *notresp)
|
|
{
|
|
|
|
return psbuf_get_reqid(cmp1) != psbuf_get_reqid(cmp2);
|
|
}
|
|
|
|
struct puffs_framebuf *
|
|
psbuf_makeout()
|
|
{
|
|
struct puffs_framebuf *pb;
|
|
|
|
pb = puffs_framebuf_make();
|
|
puffs_framebuf_seekset(pb, 4);
|
|
return pb;
|
|
}
|
|
|
|
void
|
|
psbuf_recycleout(struct puffs_framebuf *pb)
|
|
{
|
|
|
|
puffs_framebuf_recycle(pb);
|
|
puffs_framebuf_seekset(pb, 4);
|
|
}
|
|
|
|
void
|
|
psbuf_put_1(struct puffs_framebuf *pb, uint8_t val)
|
|
{
|
|
int rv;
|
|
|
|
rv = puffs_framebuf_putdata(pb, &val, 1);
|
|
CHECK(rv == 0);
|
|
}
|
|
|
|
void
|
|
psbuf_put_2(struct puffs_framebuf *pb, uint16_t val)
|
|
{
|
|
int rv;
|
|
|
|
HTOBE16(val);
|
|
rv = puffs_framebuf_putdata(pb, &val, 2);
|
|
CHECK(rv == 0);
|
|
}
|
|
|
|
void
|
|
psbuf_put_4(struct puffs_framebuf *pb, uint32_t val)
|
|
{
|
|
int rv;
|
|
|
|
HTOBE32(val);
|
|
rv = puffs_framebuf_putdata(pb, &val, 4);
|
|
CHECK(rv == 0);
|
|
}
|
|
|
|
void
|
|
psbuf_put_8(struct puffs_framebuf *pb, uint64_t val)
|
|
{
|
|
int rv;
|
|
|
|
HTOBE64(val);
|
|
rv = puffs_framebuf_putdata(pb, &val, 8);
|
|
CHECK(rv == 0);
|
|
}
|
|
|
|
void
|
|
psbuf_put_data(struct puffs_framebuf *pb, const void *data, uint32_t dlen)
|
|
{
|
|
int rv;
|
|
|
|
psbuf_put_4(pb, dlen);
|
|
rv = puffs_framebuf_putdata(pb, data, dlen);
|
|
CHECK(rv == 0);
|
|
}
|
|
|
|
void
|
|
psbuf_put_str(struct puffs_framebuf *pb, const char *str)
|
|
{
|
|
|
|
psbuf_put_data(pb, str, strlen(str));
|
|
}
|
|
|
|
void
|
|
psbuf_put_vattr(struct puffs_framebuf *pb, const struct vattr *va,
|
|
const struct psshfs_ctx *pctx)
|
|
{
|
|
uint32_t flags;
|
|
uint32_t theuid = -1, thegid = -1;
|
|
flags = 0;
|
|
|
|
if (va->va_size != (uint64_t)PUFFS_VNOVAL)
|
|
flags |= SSH_FILEXFER_ATTR_SIZE;
|
|
if (va->va_uid != (uid_t)PUFFS_VNOVAL) {
|
|
theuid = va->va_uid;
|
|
if (pctx->domangleuid && theuid == pctx->myuid)
|
|
theuid = pctx->mangleuid;
|
|
flags |= SSH_FILEXFER_ATTR_UIDGID;
|
|
}
|
|
if (va->va_gid != (gid_t)PUFFS_VNOVAL) {
|
|
thegid = va->va_gid;
|
|
if (pctx->domanglegid && thegid == pctx->mygid)
|
|
thegid = pctx->manglegid;
|
|
flags |= SSH_FILEXFER_ATTR_UIDGID;
|
|
}
|
|
if (va->va_mode != (mode_t)PUFFS_VNOVAL)
|
|
flags |= SSH_FILEXFER_ATTR_PERMISSIONS;
|
|
|
|
if (va->va_atime.tv_sec != PUFFS_VNOVAL)
|
|
flags |= SSH_FILEXFER_ATTR_ACCESSTIME;
|
|
|
|
psbuf_put_4(pb, flags);
|
|
if (flags & SSH_FILEXFER_ATTR_SIZE)
|
|
psbuf_put_8(pb, va->va_size);
|
|
if (flags & SSH_FILEXFER_ATTR_UIDGID) {
|
|
psbuf_put_4(pb, theuid);
|
|
psbuf_put_4(pb, thegid);
|
|
}
|
|
if (flags & SSH_FILEXFER_ATTR_PERMISSIONS)
|
|
psbuf_put_4(pb, va->va_mode);
|
|
|
|
/* XXX: this is totally wrong for protocol v3, see OpenSSH */
|
|
if (flags & SSH_FILEXFER_ATTR_ACCESSTIME) {
|
|
psbuf_put_4(pb, va->va_atime.tv_sec);
|
|
psbuf_put_4(pb, va->va_mtime.tv_sec);
|
|
}
|
|
}
|
|
|
|
#define ERETURN(rv) return ((rv) == -1 ? errno : 0)
|
|
|
|
int
|
|
psbuf_get_1(struct puffs_framebuf *pb, uint8_t *val)
|
|
{
|
|
|
|
ERETURN(puffs_framebuf_getdata(pb, val, 1));
|
|
}
|
|
|
|
int
|
|
psbuf_get_2(struct puffs_framebuf *pb, uint16_t *val)
|
|
{
|
|
int rv;
|
|
|
|
rv = puffs_framebuf_getdata(pb, val, 2);
|
|
BE16TOH(*val);
|
|
|
|
ERETURN(rv);
|
|
}
|
|
|
|
int
|
|
psbuf_get_4(struct puffs_framebuf *pb, uint32_t *val)
|
|
{
|
|
int rv;
|
|
|
|
rv = puffs_framebuf_getdata(pb, val, 4);
|
|
BE32TOH(*val);
|
|
|
|
ERETURN(rv);
|
|
}
|
|
|
|
int
|
|
psbuf_get_8(struct puffs_framebuf *pb, uint64_t *val)
|
|
{
|
|
int rv;
|
|
|
|
rv = puffs_framebuf_getdata(pb, val, 8);
|
|
BE64TOH(*val);
|
|
|
|
ERETURN(rv);
|
|
}
|
|
|
|
int
|
|
psbuf_get_str(struct puffs_framebuf *pb, char **strp, uint32_t *strlenp)
|
|
{
|
|
char *str;
|
|
uint32_t len;
|
|
|
|
FAILRV(psbuf_get_4(pb, &len));
|
|
|
|
if (puffs_framebuf_remaining(pb) < len)
|
|
return EPROTO;
|
|
|
|
str = emalloc(len+1);
|
|
puffs_framebuf_getdata(pb, str, len);
|
|
str[len] = '\0';
|
|
*strp = str;
|
|
|
|
if (strlenp)
|
|
*strlenp = len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
psbuf_get_vattr(struct puffs_framebuf *pb, struct vattr *vap)
|
|
{
|
|
uint32_t flags;
|
|
uint32_t val;
|
|
|
|
puffs_vattr_null(vap);
|
|
|
|
FAILRV(psbuf_get_4(pb, &flags));
|
|
|
|
if (flags & SSH_FILEXFER_ATTR_SIZE) {
|
|
FAILRV(psbuf_get_8(pb, &vap->va_size));
|
|
vap->va_bytes = vap->va_size;
|
|
}
|
|
if (flags & SSH_FILEXFER_ATTR_UIDGID) {
|
|
FAILRV(psbuf_get_4(pb, &vap->va_uid));
|
|
FAILRV(psbuf_get_4(pb, &vap->va_gid));
|
|
}
|
|
if (flags & SSH_FILEXFER_ATTR_PERMISSIONS) {
|
|
FAILRV(psbuf_get_4(pb, &vap->va_mode));
|
|
vap->va_type = puffs_mode2vt(vap->va_mode);
|
|
}
|
|
if (flags & SSH_FILEXFER_ATTR_ACCESSTIME) {
|
|
/*
|
|
* XXX: this is utterly wrong if we want to speak
|
|
* protocol version 3, but it seems like the
|
|
* "internet standard" for doing this
|
|
*/
|
|
FAILRV(psbuf_get_4(pb, &val));
|
|
vap->va_atime.tv_sec = val;
|
|
FAILRV(psbuf_get_4(pb, &val));
|
|
vap->va_mtime.tv_sec = val;
|
|
/* make ctime the same as mtime */
|
|
vap->va_ctime.tv_sec = val;
|
|
|
|
vap->va_atime.tv_nsec = 0;
|
|
vap->va_ctime.tv_nsec = 0;
|
|
vap->va_mtime.tv_nsec = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Buffer content helpers. Caller frees all data.
|
|
*/
|
|
|
|
/*
|
|
* error mapping.. most are not expected for a file system, but
|
|
* should help with diagnosing a possible error
|
|
*/
|
|
static int emap[] = {
|
|
0, /* OK */
|
|
0, /* EOF */
|
|
ENOENT, /* NO_SUCH_FILE */
|
|
EPERM, /* PERMISSION_DENIED */
|
|
EIO, /* FAILURE */
|
|
EBADMSG, /* BAD_MESSAGE */
|
|
ENOTCONN, /* NO_CONNECTION */
|
|
ECONNRESET, /* CONNECTION_LOST */
|
|
EOPNOTSUPP, /* OP_UNSUPPORTED */
|
|
EINVAL, /* INVALID_HANDLE */
|
|
ENXIO, /* NO_SUCH_PATH */
|
|
EEXIST, /* FILE_ALREADY_EXISTS */
|
|
ENODEV /* WRITE_PROTECT */
|
|
};
|
|
#define NERRORS ((int)(sizeof(emap) / sizeof(emap[0])))
|
|
|
|
static int
|
|
sftperr_to_errno(int error)
|
|
{
|
|
|
|
if (!error)
|
|
return 0;
|
|
|
|
if (error >= NERRORS || error < 0)
|
|
return EPROTO;
|
|
|
|
return emap[error];
|
|
}
|
|
|
|
#define INVALRESPONSE EPROTO
|
|
|
|
static int
|
|
expectcode(struct puffs_framebuf *pb, int value)
|
|
{
|
|
uint32_t error;
|
|
uint8_t type;
|
|
|
|
type = psbuf_get_type(pb);
|
|
if (type == value)
|
|
return 0;
|
|
|
|
if (type != SSH_FXP_STATUS)
|
|
return INVALRESPONSE;
|
|
|
|
FAILRV(psbuf_get_4(pb, &error));
|
|
|
|
return sftperr_to_errno(error);
|
|
}
|
|
|
|
#define CHECKCODE(pb,val) \
|
|
do { \
|
|
int rv; \
|
|
rv = expectcode(pb, val); \
|
|
if (rv) \
|
|
return rv; \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
int
|
|
psbuf_expect_status(struct puffs_framebuf *pb)
|
|
{
|
|
uint32_t error;
|
|
|
|
if (psbuf_get_type(pb) != SSH_FXP_STATUS)
|
|
return INVALRESPONSE;
|
|
|
|
FAILRV(psbuf_get_4(pb, &error));
|
|
|
|
return sftperr_to_errno(error);
|
|
}
|
|
|
|
int
|
|
psbuf_expect_handle(struct puffs_framebuf *pb, char **hand, uint32_t *handlen)
|
|
{
|
|
|
|
CHECKCODE(pb, SSH_FXP_HANDLE);
|
|
FAILRV(psbuf_get_str(pb, hand, handlen));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* no memory allocation, direct copy */
|
|
int
|
|
psbuf_do_data(struct puffs_framebuf *pb, uint8_t *data, uint32_t *dlen)
|
|
{
|
|
void *win;
|
|
size_t bufoff, winlen;
|
|
uint32_t len, dataoff;
|
|
|
|
if (psbuf_get_type(pb) != SSH_FXP_DATA) {
|
|
uint32_t val;
|
|
|
|
if (psbuf_get_type(pb) != SSH_FXP_STATUS)
|
|
return INVALRESPONSE;
|
|
|
|
if (psbuf_get_4(pb, &val) != 0)
|
|
return INVALRESPONSE;
|
|
|
|
if (val != SSH_FX_EOF)
|
|
return sftperr_to_errno(val);
|
|
|
|
*dlen = 0;
|
|
return 0;
|
|
}
|
|
if (psbuf_get_4(pb, &len) != 0)
|
|
return INVALRESPONSE;
|
|
|
|
if (*dlen < len)
|
|
return EINVAL;
|
|
|
|
*dlen = 0;
|
|
|
|
dataoff = 0;
|
|
while (dataoff < len) {
|
|
winlen = len-dataoff;
|
|
bufoff = puffs_framebuf_telloff(pb);
|
|
if (puffs_framebuf_getwindow(pb, bufoff,
|
|
&win, &winlen) == -1)
|
|
return EINVAL;
|
|
if (winlen == 0)
|
|
break;
|
|
|
|
memcpy(data + dataoff, win, winlen);
|
|
dataoff += winlen;
|
|
}
|
|
|
|
*dlen = dataoff;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
psbuf_expect_name(struct puffs_framebuf *pb, uint32_t *count)
|
|
{
|
|
|
|
CHECKCODE(pb, SSH_FXP_NAME);
|
|
FAILRV(psbuf_get_4(pb, count));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
psbuf_expect_attrs(struct puffs_framebuf *pb, struct vattr *vap)
|
|
{
|
|
|
|
CHECKCODE(pb, SSH_FXP_ATTRS);
|
|
FAILRV(psbuf_get_vattr(pb, vap));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* More helpers: larger-scale put functions
|
|
*/
|
|
|
|
void
|
|
psbuf_req_data(struct puffs_framebuf *pb, int type, uint32_t reqid,
|
|
const void *data, uint32_t dlen)
|
|
{
|
|
|
|
psbuf_put_1(pb, type);
|
|
psbuf_put_4(pb, reqid);
|
|
psbuf_put_data(pb, data, dlen);
|
|
}
|
|
|
|
void
|
|
psbuf_req_str(struct puffs_framebuf *pb, int type, uint32_t reqid,
|
|
const char *str)
|
|
{
|
|
|
|
psbuf_req_data(pb, type, reqid, str, strlen(str));
|
|
}
|