/*      $NetBSD: fs.c,v 1.25 2019/09/23 12:00:58 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: fs.c,v 1.25 2019/09/23 12:00:58 christos Exp $");
#endif /* !lint */

#include <err.h>
#include <errno.h>
#include <puffs.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "psshfs.h"
#include "sftp_proto.h"

#define DO_IO(fname, a1, a2, a3, a4, rv)                                \
do {                                                                    \
       puffs_framebuf_seekset(a2, 0);                                  \
       *(a4) = 0;                                                      \
       rv = fname(a1, a2, a3, a4);                                     \
       if (rv) {                                                       \
               return rv ? rv : EPROTO;                                \
       }                                                               \
} while (/*CONSTCOND*/0)

#define reterr(str, rv)                                                 \
do {                                                                    \
       fprintf str;                                                    \
       return rv;                                                      \
} while (/*CONSTCOND*/0)

/* openssh extensions */
static const struct extunit {
       const char *ext;
       const char *val;
       int extflag;
} exttable[] = {
{
       "[email protected]",
       "1",
       SFTP_EXT_POSIX_RENAME,
},{
       "[email protected]",
       "2",
       SFTP_EXT_STATVFS,
},{
       "[email protected]",
       "2",
       SFTP_EXT_FSTATVFS,
},{
       NULL,
       NULL,
       0
}};

int
psshfs_handshake(struct puffs_usermount *pu, int fd)
{
       struct psshfs_ctx *pctx = puffs_getspecific(pu);
       struct puffs_framebuf *pb;
       struct puffs_pathobj *po_root;
       struct puffs_node *pn_root;
       struct vattr va, *rva;
       const struct extunit *extu;
       char *rootpath;
       char *ext, *val;
       uint32_t count;
       int rv, done;

       pb = psbuf_makeout();
       psbuf_put_1(pb, SSH_FXP_INIT);
       psbuf_put_4(pb, SFTP_PROTOVERSION);
       DO_IO(psbuf_write, pu, pb, fd, &done, rv);

       puffs_framebuf_recycle(pb);
       DO_IO(psbuf_read, pu, pb, fd, &done, rv);
       if (psbuf_get_type(pb) != SSH_FXP_VERSION)
               reterr((stderr, "invalid server response: %d",
                   psbuf_get_type(pb)), EPROTO);
       pctx->protover = psbuf_get_reqid(pb);

       /*
        * Check out which extensions are available.  Currently
        * we are only interested in the openssh statvfs extension.
        */
       for (;;) {
               if (psbuf_get_str(pb, &ext, NULL) != 0)
                       break;
               if (psbuf_get_str(pb, &val, NULL) != 0)
                       break;

               for (extu = exttable; extu->ext; extu++)
                       if (strcmp(ext, extu->ext) == 0
                           && strcmp(val, extu->val) == 0)
                               pctx->extensions |= extu->extflag;
       }

       /* scope out our rootpath */
       psbuf_recycleout(pb);
       psbuf_put_1(pb, SSH_FXP_REALPATH);
       psbuf_put_4(pb, NEXTREQ(pctx));
       psbuf_put_str(pb, pctx->mountpath);
       DO_IO(psbuf_write, pu, pb, fd, &done, rv);

       puffs_framebuf_recycle(pb);
       DO_IO(psbuf_read, pu, pb, fd, &done, rv);
       if (psbuf_get_type(pb) != SSH_FXP_NAME)
               reterr((stderr, "invalid server realpath response for \"%s\"",
                   pctx->mountpath), EPROTO);
       if (psbuf_get_4(pb, &count) == -1)
               reterr((stderr, "invalid realpath response: count"), EPROTO);
       if (psbuf_get_str(pb, &rootpath, NULL) == -1)
               reterr((stderr, "invalid realpath response: rootpath"), EPROTO);

       /* stat the rootdir so that we know it's a dir */
       psbuf_recycleout(pb);
       psbuf_req_str(pb, SSH_FXP_LSTAT, NEXTREQ(pctx), rootpath);
       DO_IO(psbuf_write, pu, pb, fd, &done, rv);

       puffs_framebuf_recycle(pb);
       DO_IO(psbuf_read, pu, pb, fd, &done, rv);

       rv = psbuf_expect_attrs(pb, &va);
       if (rv)
               reterr((stderr, "couldn't stat rootpath"), rv);
       puffs_framebuf_destroy(pb);

       if (puffs_mode2vt(va.va_mode) != VDIR)
               reterr((stderr, "remote path (%s) not a directory", rootpath),
                   ENOTDIR);

       pn_root = puffs_getroot(pu);
       rva = &pn_root->pn_va;
       puffs_setvattr(rva, &va);

       po_root = puffs_getrootpathobj(pu);
       if (po_root == NULL)
               err(1, "getrootpathobj");
       po_root->po_path = rootpath;
       po_root->po_len = strlen(rootpath);

       return 0;
}

int
psshfs_fs_statvfs(struct puffs_usermount *pu, struct puffs_statvfs *sbp)
{
       PSSHFSAUTOVAR(pu);
       uint64_t tmpval;
       uint8_t type;

       memset(sbp, 0, sizeof(*sbp));
       sbp->f_bsize = sbp->f_frsize = sbp->f_iosize = 512;

       if ((pctx->extensions & SFTP_EXT_STATVFS) == 0)
               goto out;

       psbuf_req_str(pb, SSH_FXP_EXTENDED, reqid, "[email protected]");
       psbuf_put_str(pb, pctx->mountpath);
       GETRESPONSE(pb, pctx->sshfd);

       type = psbuf_get_type(pb);
       if (type != SSH_FXP_EXTENDED_REPLY) {
               /* use the default */
               goto out;
       }

       psbuf_get_8(pb, &tmpval);
       sbp->f_bsize = tmpval;
       psbuf_get_8(pb, &tmpval);
       sbp->f_frsize = tmpval;
       psbuf_get_8(pb, &sbp->f_blocks);
       psbuf_get_8(pb, &sbp->f_bfree);
       psbuf_get_8(pb, &sbp->f_bavail);
       psbuf_get_8(pb, &sbp->f_files);
       psbuf_get_8(pb, &sbp->f_ffree);
       psbuf_get_8(pb, &sbp->f_favail);

       psbuf_get_8(pb, &tmpval); /* fsid */
       psbuf_get_8(pb, &tmpval); /* flag */
       psbuf_get_8(pb, &tmpval);
       sbp->f_namemax = tmpval;

       sbp->f_bresvd = sbp->f_bfree - sbp->f_bavail;
       sbp->f_fresvd = sbp->f_ffree - sbp->f_favail;

out:
       PSSHFSRETURN(rv);
}

int
psshfs_fs_unmount(struct puffs_usermount *pu, int flags)
{
       struct psshfs_ctx *pctx = puffs_getspecific(pu);

       kill(pctx->sshpid, SIGTERM);
       close(pctx->sshfd);
       if (pctx->numconnections == 2) {
               kill(pctx->sshpid_data, SIGTERM);
               close(pctx->sshfd_data);
       }

       return 0;
}

int
psshfs_fs_nodetofh(struct puffs_usermount *pu, puffs_cookie_t cookie,
       void *fid, size_t *fidsize)
{
       struct psshfs_ctx *pctx = puffs_getspecific(pu);
       struct puffs_node *pn = cookie;
       struct psshfs_node *psn = pn->pn_data;
       struct psshfs_fid *pf = fid;

       pf->mounttime = pctx->mounttime;
       pf->node = pn;

       psn->stat |= PSN_HASFH;

       return 0;
}

int
psshfs_fs_fhtonode(struct puffs_usermount *pu, void *fid, size_t fidsize,
       struct puffs_newinfo *pni)
{
       struct psshfs_ctx *pctx = puffs_getspecific(pu);
       struct psshfs_fid *pf = fid;
       struct puffs_node *pn = pf->node;
       struct psshfs_node *psn;
       int rv;

       if (pf->mounttime != pctx->mounttime)
               return EINVAL;
       if (pn == 0)
               return EINVAL;
       psn = pn->pn_data;
       if ((psn->stat & PSN_HASFH) == 0)
               return EINVAL;

       /* update node attributes */
       rv = getnodeattr(pu, pn, NULL);
       if (rv)
               return EINVAL;

       puffs_newinfo_setcookie(pni, pn);
       puffs_newinfo_setvtype(pni, pn->pn_va.va_type);
       puffs_newinfo_setsize(pni, pn->pn_va.va_size);

       return 0;
}

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