590 lines
12 KiB
C
590 lines
12 KiB
C
/* $NetBSD: psbuf.c,v 1.18 2010/01/08 10:53:31 pooka Exp $ */
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/*
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* Copyright (c) 2006-2009 Antti Kantee. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: psbuf.c,v 1.18 2010/01/08 10:53:31 pooka Exp $");
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#endif /* !lint */
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/*
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* buffering functions for network input/output. slightly different
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* from the average joe buffer routines, as is usually the case ...
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* these use efuns for now.
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*/
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/vnode.h>
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#include <err.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <util.h>
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#include <unistd.h>
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#include "psshfs.h"
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#include "sftp_proto.h"
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#define FAILRV(x) do { int rv; if ((rv=x)) return (rv); } while (/*CONSTCOND*/0)
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#define READSTATE_LENGTH(off) (off < 4)
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#define SFTP_LENOFF 0
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#define SFTP_TYPEOFF 4
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#define SFTP_REQIDOFF 5
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#define CHECK(v) if (!(v)) abort()
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uint8_t
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psbuf_get_type(struct puffs_framebuf *pb)
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{
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uint8_t type;
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puffs_framebuf_getdata_atoff(pb, SFTP_TYPEOFF, &type, 1);
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return type;
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}
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uint32_t
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psbuf_get_len(struct puffs_framebuf *pb)
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{
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uint32_t len;
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puffs_framebuf_getdata_atoff(pb, SFTP_LENOFF, &len, 4);
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return be32toh(len);
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}
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uint32_t
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psbuf_get_reqid(struct puffs_framebuf *pb)
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{
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uint32_t req;
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puffs_framebuf_getdata_atoff(pb, SFTP_REQIDOFF, &req, 4);
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return be32toh(req);
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}
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#define CUROFF(pb) (puffs_framebuf_telloff(pb))
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int
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psbuf_read(struct puffs_usermount *pu, struct puffs_framebuf *pb,
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int fd, int *done)
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{
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void *win;
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ssize_t n;
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size_t howmuch, winlen;
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int lenstate;
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the_next_level:
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if ((lenstate = READSTATE_LENGTH(CUROFF(pb))))
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howmuch = 4 - CUROFF(pb);
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else
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howmuch = psbuf_get_len(pb) - (CUROFF(pb) - 4);
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if (puffs_framebuf_reserve_space(pb, howmuch) == -1)
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return errno;
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while (howmuch) {
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winlen = howmuch;
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if (puffs_framebuf_getwindow(pb, CUROFF(pb), &win, &winlen)==-1)
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return errno;
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n = recv(fd, win, winlen, MSG_NOSIGNAL);
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switch (n) {
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case 0:
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return ECONNRESET;
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case -1:
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if (errno == EAGAIN)
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return 0;
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return errno;
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default:
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howmuch -= n;
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puffs_framebuf_seekset(pb, CUROFF(pb) + n);
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break;
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}
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}
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if (!lenstate) {
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/* XXX: initial exchange shorter.. but don't worry, be happy */
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puffs_framebuf_seekset(pb, 9);
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*done = 1;
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return 0;
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} else
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goto the_next_level;
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}
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int
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psbuf_write(struct puffs_usermount *pu, struct puffs_framebuf *pb,
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int fd, int *done)
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{
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void *win;
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ssize_t n;
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size_t winlen, howmuch;
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/* finalize buffer.. could be elsewhere ... */
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if (CUROFF(pb) == 0) {
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uint32_t len;
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len = htobe32(puffs_framebuf_tellsize(pb) - 4);
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puffs_framebuf_putdata_atoff(pb, 0, &len, 4);
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}
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howmuch = puffs_framebuf_tellsize(pb) - CUROFF(pb);
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while (howmuch) {
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winlen = howmuch;
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if (puffs_framebuf_getwindow(pb, CUROFF(pb), &win, &winlen)==-1)
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return errno;
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n = send(fd, win, winlen, MSG_NOSIGNAL);
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switch (n) {
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case 0:
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return ECONNRESET;
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case -1:
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if (errno == EAGAIN)
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return 0;
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return errno;
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default:
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howmuch -= n;
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puffs_framebuf_seekset(pb, CUROFF(pb) + n);
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break;
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}
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}
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*done = 1;
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return 0;
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}
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#undef CUROFF
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int
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psbuf_cmp(struct puffs_usermount *pu,
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struct puffs_framebuf *cmp1, struct puffs_framebuf *cmp2, int *notresp)
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{
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return psbuf_get_reqid(cmp1) != psbuf_get_reqid(cmp2);
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}
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struct puffs_framebuf *
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psbuf_makeout()
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{
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struct puffs_framebuf *pb;
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pb = puffs_framebuf_make();
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puffs_framebuf_seekset(pb, 4);
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return pb;
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}
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void
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psbuf_recycleout(struct puffs_framebuf *pb)
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{
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puffs_framebuf_recycle(pb);
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puffs_framebuf_seekset(pb, 4);
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}
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void
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psbuf_put_1(struct puffs_framebuf *pb, uint8_t val)
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{
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int rv;
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rv = puffs_framebuf_putdata(pb, &val, 1);
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CHECK(rv == 0);
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}
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void
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psbuf_put_2(struct puffs_framebuf *pb, uint16_t val)
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{
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int rv;
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HTOBE16(val);
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rv = puffs_framebuf_putdata(pb, &val, 2);
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CHECK(rv == 0);
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}
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void
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psbuf_put_4(struct puffs_framebuf *pb, uint32_t val)
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{
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int rv;
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HTOBE32(val);
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rv = puffs_framebuf_putdata(pb, &val, 4);
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CHECK(rv == 0);
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}
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void
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psbuf_put_8(struct puffs_framebuf *pb, uint64_t val)
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{
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int rv;
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HTOBE64(val);
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rv = puffs_framebuf_putdata(pb, &val, 8);
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CHECK(rv == 0);
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}
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void
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psbuf_put_data(struct puffs_framebuf *pb, const void *data, uint32_t dlen)
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{
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int rv;
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psbuf_put_4(pb, dlen);
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rv = puffs_framebuf_putdata(pb, data, dlen);
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CHECK(rv == 0);
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}
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void
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psbuf_put_str(struct puffs_framebuf *pb, const char *str)
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{
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psbuf_put_data(pb, str, strlen(str));
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}
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void
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psbuf_put_vattr(struct puffs_framebuf *pb, const struct vattr *va,
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const struct psshfs_ctx *pctx)
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{
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uint32_t flags;
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uint32_t theuid = -1, thegid = -1;
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flags = 0;
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if (va->va_size != (uint64_t)PUFFS_VNOVAL)
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flags |= SSH_FILEXFER_ATTR_SIZE;
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if (va->va_uid != (uid_t)PUFFS_VNOVAL) {
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theuid = va->va_uid;
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if (pctx->domangleuid && theuid == pctx->myuid)
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theuid = pctx->mangleuid;
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flags |= SSH_FILEXFER_ATTR_UIDGID;
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}
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if (va->va_gid != (gid_t)PUFFS_VNOVAL) {
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thegid = va->va_gid;
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if (pctx->domanglegid && thegid == pctx->mygid)
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thegid = pctx->manglegid;
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flags |= SSH_FILEXFER_ATTR_UIDGID;
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}
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if (va->va_mode != (mode_t)PUFFS_VNOVAL)
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flags |= SSH_FILEXFER_ATTR_PERMISSIONS;
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if (va->va_atime.tv_sec != PUFFS_VNOVAL)
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flags |= SSH_FILEXFER_ATTR_ACCESSTIME;
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psbuf_put_4(pb, flags);
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if (flags & SSH_FILEXFER_ATTR_SIZE)
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psbuf_put_8(pb, va->va_size);
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if (flags & SSH_FILEXFER_ATTR_UIDGID) {
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psbuf_put_4(pb, theuid);
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psbuf_put_4(pb, thegid);
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}
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if (flags & SSH_FILEXFER_ATTR_PERMISSIONS)
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psbuf_put_4(pb, va->va_mode);
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/* XXX: this is totally wrong for protocol v3, see OpenSSH */
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if (flags & SSH_FILEXFER_ATTR_ACCESSTIME) {
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psbuf_put_4(pb, va->va_atime.tv_sec);
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psbuf_put_4(pb, va->va_mtime.tv_sec);
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}
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}
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#define ERETURN(rv) return ((rv) == -1 ? errno : 0)
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int
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psbuf_get_1(struct puffs_framebuf *pb, uint8_t *val)
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{
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ERETURN(puffs_framebuf_getdata(pb, val, 1));
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}
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int
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psbuf_get_2(struct puffs_framebuf *pb, uint16_t *val)
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{
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int rv;
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rv = puffs_framebuf_getdata(pb, val, 2);
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BE16TOH(*val);
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ERETURN(rv);
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}
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int
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psbuf_get_4(struct puffs_framebuf *pb, uint32_t *val)
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{
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int rv;
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rv = puffs_framebuf_getdata(pb, val, 4);
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BE32TOH(*val);
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ERETURN(rv);
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}
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int
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psbuf_get_8(struct puffs_framebuf *pb, uint64_t *val)
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{
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int rv;
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rv = puffs_framebuf_getdata(pb, val, 8);
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BE64TOH(*val);
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ERETURN(rv);
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}
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int
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psbuf_get_str(struct puffs_framebuf *pb, char **strp, uint32_t *strlenp)
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{
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char *str;
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uint32_t len;
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FAILRV(psbuf_get_4(pb, &len));
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if (puffs_framebuf_remaining(pb) < len)
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return EPROTO;
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str = emalloc(len+1);
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puffs_framebuf_getdata(pb, str, len);
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str[len] = '\0';
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*strp = str;
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if (strlenp)
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*strlenp = len;
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return 0;
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}
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int
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psbuf_get_vattr(struct puffs_framebuf *pb, struct vattr *vap)
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{
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uint32_t flags;
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uint32_t val;
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puffs_vattr_null(vap);
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FAILRV(psbuf_get_4(pb, &flags));
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if (flags & SSH_FILEXFER_ATTR_SIZE) {
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FAILRV(psbuf_get_8(pb, &vap->va_size));
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vap->va_bytes = vap->va_size;
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}
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if (flags & SSH_FILEXFER_ATTR_UIDGID) {
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FAILRV(psbuf_get_4(pb, &vap->va_uid));
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FAILRV(psbuf_get_4(pb, &vap->va_gid));
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}
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if (flags & SSH_FILEXFER_ATTR_PERMISSIONS) {
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FAILRV(psbuf_get_4(pb, &vap->va_mode));
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vap->va_type = puffs_mode2vt(vap->va_mode);
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}
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if (flags & SSH_FILEXFER_ATTR_ACCESSTIME) {
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/*
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* XXX: this is utterly wrong if we want to speak
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* protocol version 3, but it seems like the
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* "internet standard" for doing this
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*/
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FAILRV(psbuf_get_4(pb, &val));
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vap->va_atime.tv_sec = val;
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FAILRV(psbuf_get_4(pb, &val));
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vap->va_mtime.tv_sec = val;
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/* make ctime the same as mtime */
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vap->va_ctime.tv_sec = val;
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vap->va_atime.tv_nsec = 0;
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vap->va_ctime.tv_nsec = 0;
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vap->va_mtime.tv_nsec = 0;
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}
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return 0;
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}
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/*
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* Buffer content helpers. Caller frees all data.
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*/
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/*
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* error mapping.. most are not expected for a file system, but
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* should help with diagnosing a possible error
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*/
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static int emap[] = {
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0, /* OK */
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0, /* EOF */
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ENOENT, /* NO_SUCH_FILE */
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EPERM, /* PERMISSION_DENIED */
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EIO, /* FAILURE */
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EBADMSG, /* BAD_MESSAGE */
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ENOTCONN, /* NO_CONNECTION */
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ECONNRESET, /* CONNECTION_LOST */
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EOPNOTSUPP, /* OP_UNSUPPORTED */
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EINVAL, /* INVALID_HANDLE */
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ENXIO, /* NO_SUCH_PATH */
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EEXIST, /* FILE_ALREADY_EXISTS */
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ENODEV /* WRITE_PROTECT */
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};
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#define NERRORS ((int)(sizeof(emap) / sizeof(emap[0])))
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static int
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sftperr_to_errno(int error)
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{
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if (!error)
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return 0;
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if (error >= NERRORS || error < 0)
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return EPROTO;
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return emap[error];
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}
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#define INVALRESPONSE EPROTO
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static int
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expectcode(struct puffs_framebuf *pb, int value)
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{
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uint32_t error;
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uint8_t type;
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type = psbuf_get_type(pb);
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if (type == value)
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return 0;
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if (type != SSH_FXP_STATUS)
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return INVALRESPONSE;
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FAILRV(psbuf_get_4(pb, &error));
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return sftperr_to_errno(error);
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}
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#define CHECKCODE(pb,val) \
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do { \
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int rv; \
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rv = expectcode(pb, val); \
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if (rv) \
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return rv; \
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} while (/*CONSTCOND*/0)
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int
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psbuf_expect_status(struct puffs_framebuf *pb)
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{
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uint32_t error;
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if (psbuf_get_type(pb) != SSH_FXP_STATUS)
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return INVALRESPONSE;
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FAILRV(psbuf_get_4(pb, &error));
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return sftperr_to_errno(error);
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}
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int
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psbuf_expect_handle(struct puffs_framebuf *pb, char **hand, uint32_t *handlen)
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{
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CHECKCODE(pb, SSH_FXP_HANDLE);
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FAILRV(psbuf_get_str(pb, hand, handlen));
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return 0;
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}
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/* no memory allocation, direct copy */
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int
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psbuf_do_data(struct puffs_framebuf *pb, uint8_t *data, uint32_t *dlen)
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{
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void *win;
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size_t bufoff, winlen;
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uint32_t len, dataoff;
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if (psbuf_get_type(pb) != SSH_FXP_DATA) {
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uint32_t val;
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if (psbuf_get_type(pb) != SSH_FXP_STATUS)
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return INVALRESPONSE;
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if (psbuf_get_4(pb, &val) != 0)
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return INVALRESPONSE;
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if (val != SSH_FX_EOF)
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return sftperr_to_errno(val);
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*dlen = 0;
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return 0;
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}
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if (psbuf_get_4(pb, &len) != 0)
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return INVALRESPONSE;
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if (*dlen < len)
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return EINVAL;
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*dlen = 0;
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dataoff = 0;
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while (dataoff < len) {
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winlen = len-dataoff;
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bufoff = puffs_framebuf_telloff(pb);
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if (puffs_framebuf_getwindow(pb, bufoff,
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&win, &winlen) == -1)
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return EINVAL;
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if (winlen == 0)
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break;
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memcpy(data + dataoff, win, winlen);
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dataoff += winlen;
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}
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*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));
|
|
}
|