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/*********************************************************
* Copyright (C) 2013 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation version 2.1 and no later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the Lesser GNU General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
*********************************************************/
/*
* link.c --
*
* Symlink-specific operations for HGFS driver
*/
#include "module.h"
/*
*----------------------------------------------------------------------
*
* HgfsPackSymlinkCreateRequest --
*
* Setup the create symlink request, depending on the op version.
*
* Results:
* Returns zero on success, or negative error on failure.
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
static int
HgfsPackSymlinkCreateRequest(const char* symlink, // IN: path of the link
const char *symname, // IN: Target name
HgfsOp opUsed, // IN: Op to be used
HgfsReq *req) // IN/OUT: Packet to write into
{
HgfsRequestSymlinkCreateV3 *requestV3 = NULL;
HgfsRequestSymlinkCreate *request = NULL;
char *symlinkName;
uint32 *symlinkNameLength;
char *targetName;
uint32 *targetNameLength;
size_t targetNameBytes;
size_t requestSize;
int result;
switch (opUsed) {
case HGFS_OP_CREATE_SYMLINK_V3: {
requestV3 = HgfsGetRequestPayload(req);
/* We'll use these later. */
symlinkName = requestV3->symlinkName.name;
symlinkNameLength = &requestV3->symlinkName.length;
requestV3->symlinkName.flags = 0;
requestV3->symlinkName.fid = HGFS_INVALID_HANDLE;
requestV3->symlinkName.caseType = HGFS_FILE_NAME_CASE_SENSITIVE;
requestV3->reserved = 0;
requestSize = sizeof(*requestV3) + HgfsGetRequestHeaderSize();
break;
}
case HGFS_OP_CREATE_SYMLINK: {
request = (HgfsRequestSymlinkCreate *)(HGFS_REQ_PAYLOAD(req));
/* We'll use these later. */
symlinkName = request->symlinkName.name;
symlinkNameLength = &request->symlinkName.length;
requestSize = sizeof *request;
break;
}
default:
LOG(4, ("Unexpected OP type encountered. opUsed = %d\n", opUsed));
return -EPROTO;
}
/* Convert symlink name to CP format. */
result = CPName_ConvertTo(symlink,
HGFS_LARGE_PACKET_MAX - (requestSize - 1),
symlinkName);
if (result < 0) {
LOG(4, ("SymlinkName CP conversion failed.\n"));
return -EINVAL;
}
*symlinkNameLength = result;
req->payloadSize = requestSize + result;
/*
* Note the different buffer length. This is because HgfsRequestSymlink
* contains two filenames, and once we place the first into the packet we
* must account for it when determining the amount of buffer available for
* the second.
*
* Also note that targetNameBytes accounts for the NUL character. Once
* we've converted it to CP name, it won't be NUL-terminated and the length
* of the string in the packet itself won't account for it.
*/
if (opUsed == HGFS_OP_CREATE_SYMLINK_V3) {
HgfsFileNameV3 *fileNameP;
fileNameP = (HgfsFileNameV3 *)((char *)&requestV3->symlinkName +
sizeof requestV3->symlinkName + result);
targetName = fileNameP->name;
targetNameLength = &fileNameP->length;
fileNameP->flags = 0;
fileNameP->fid = HGFS_INVALID_HANDLE;
fileNameP->caseType = HGFS_FILE_NAME_CASE_SENSITIVE;
} else {
HgfsFileName *fileNameP;
fileNameP = (HgfsFileName *)((char *)&request->symlinkName +
sizeof request->symlinkName + result);
targetName = fileNameP->name;
targetNameLength = &fileNameP->length;
}
targetNameBytes = strlen(symname) + 1;
/* Copy target name into request packet. */
if (targetNameBytes > HGFS_LARGE_PACKET_MAX - (requestSize - 1)) {
LOG(4, ("Target name is too long.\n"));
return -EINVAL;
}
memcpy(targetName, symname, targetNameBytes);
LOG(6, ("Target name: \"%s\"\n", targetName));
/* Convert target name to CPName-lite format. */
CPNameLite_ConvertTo(targetName, targetNameBytes - 1, '/');
*targetNameLength = targetNameBytes - 1;
req->payloadSize += targetNameBytes - 1;
/* Fill in header here as payloadSize needs to be there. */
HgfsPackHeader(req, opUsed);
return 0;
}
/*
*----------------------------------------------------------------------
*
* HgfsSymlink --
*
* Handle a symlink request
*
* Results:
* Returns zero on success, or a negative error on failure.
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
int
HgfsSymlink(const char* source, // IN: Source name
const char *symname) // IN: Target name
{
HgfsReq *req;
int result = 0;
HgfsOp opUsed;
HgfsStatus replyStatus;
req = HgfsGetNewRequest();
if (!req) {
LOG(4, ("Out of memory while getting new request.\n"));
result = -ENOMEM;
goto out;
}
retry:
opUsed = hgfsVersionCreateSymlink;
result = HgfsPackSymlinkCreateRequest(source, symname, opUsed, req);
if (result != 0) {
LOG(4, ("Error packing request.\n"));
goto out;
}
result = HgfsSendRequest(req);
if (result == 0) {
LOG(6, ("Got reply.\n"));
replyStatus = HgfsGetReplyStatus(req);
result = HgfsStatusConvertToLinux(replyStatus);
if (result == 0) {
LOG(6, ("Symlink created successfully, instantiating dentry.\n"));
} else if (result == -EPROTO) {
/* Retry with older version(s). Set globally. */
if (opUsed == HGFS_OP_CREATE_SYMLINK_V3) {
LOG(4, ("Version 3 not supported. Falling back to version 2.\n"));
hgfsVersionCreateSymlink = HGFS_OP_CREATE_SYMLINK;
goto retry;
} else {
LOG(6, ("Symlink was not created, error %d\n", result));
}
}
} else if (result == -EIO) {
LOG(4, ("Timed out. error: %d\n", result));
} else if (result == -EPROTO) {
LOG(4, ("Server returned error: %d\n", result));
} else {
LOG(4, ("Unknown error: %d\n", result));
}
out:
HgfsFreeRequest(req);
return result;
}
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