/
XrdHttpReq.cc
2018 lines (1436 loc) · 52.2 KB
/
XrdHttpReq.cc
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//------------------------------------------------------------------------------
// This file is part of XrdHTTP: A pragmatic implementation of the
// HTTP/WebDAV protocol for the Xrootd framework
//
// Copyright (c) 2013 by European Organization for Nuclear Research (CERN)
// Author: Fabrizio Furano <furano@cern.ch>
// File Date: Nov 2012
//------------------------------------------------------------------------------
// XRootD 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, either version 3 of the License, or
// (at your option) any later version.
//
// XRootD 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
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with XRootD. If not, see <http://www.gnu.org/licenses/>.
//------------------------------------------------------------------------------
/** @file XrdHttpReq.cc
* @brief Main request/response class, handling the logical status of the communication
* @author Fabrizio Furano
* @date Nov 2012
*
*
*
*/
#include "XrdVersion.hh"
#include "XrdHttpReq.hh"
#include "XrdHttpTrace.hh"
#include <string.h>
#include <arpa/inet.h>
#include <sstream>
#include "XrdSys/XrdSysPlatform.hh"
#include "XrdOuc/XrdOucEnv.hh"
#include "XrdHttpProtocol.hh"
#include "Xrd/XrdLink.hh"
#include "XrdXrootd/XrdXrootdBridge.hh"
#include "Xrd/XrdBuffer.hh"
#include <algorithm>
#include <functional>
#include <cctype>
#include <locale>
#include "XrdHttpUtils.hh"
#include "XrdHttpStatic.hh"
#define MAX_TK_LEN 256
#define MAX_RESOURCE_LEN 16384
// This is to fix the trace macros
#define TRACELINK prot->Link
// trim from start
static inline void ltrim(std::string &s) {
s.erase(s.begin(), std::find_if(s.begin(), s.end(), std::not1(std::ptr_fun<int, int>(std::isspace))));
s.erase(s.begin(), std::find_if(s.begin(), s.end(), std::not1(std::ptr_fun<int, int>(std::iscntrl))));
}
// trim from end
static inline void rtrim(std::string &s) {
s.erase(std::find_if(s.rbegin(), s.rend(), std::not1(std::ptr_fun<int, int>(std::isspace))).base(), s.end());
s.erase(std::find_if(s.rbegin(), s.rend(), std::not1(std::ptr_fun<int, int>(std::iscntrl))).base(), s.end());
}
// trim from both ends
//static inline void trim(std::string &s) {
// ltrim(s);
// rtrim(s);
//}
void trim(std::string &str)
{
// Trim leading non-letters
while(str.size() && !isalnum(str[0])) str.erase(0);
// Trim trailing non-letters
while(str.size() && !isalnum(str[str.size()-1]))
str.resize (str.size () - 1);
}
std::string ISOdatetime(time_t t) {
char datebuf[128];
struct tm t1;
memset(&t1, 0, sizeof (t1));
gmtime_r(&t, &t1);
strftime(datebuf, 127, "%a, %d %b %Y %H:%M:%S GMT", &t1);
return (string) datebuf;
}
int XrdHttpReq::parseBody(char *body, long long len) {
/*
* The document being in memory, it has no base per RFC 2396,
* and the "noname.xml" argument will serve as its base.
*/
//xmlbody = xmlReadMemory(body, len, "noname.xml", NULL, 0);
//if (xmlbody == NULL) {
// fprintf(stderr, "Failed to parse document\n");
// return 1;
//}
return 1;
}
XrdHttpReq::~XrdHttpReq() {
//if (xmlbody) xmlFreeDoc(xmlbody);
reset();
}
int XrdHttpReq::parseLine(char *line, int len) {
char *key = line;
int pos;
// Do the parsing
if (!line) return -1;
char *p = strchr((char *) line, (int) ':');
if (!p) {
request = rtMalformed;
return 0;
}
pos = (p - line);
if (pos > (MAX_TK_LEN - 1)) {
request = rtMalformed;
return -2;
}
if (pos > 0) {
line[pos] = 0;
char *val = line + pos + 1;
// Trim left
while (!isalnum(*val) || (!*val)) val++;
// Here we are supposed to initialize whatever flag or variable that is needed
// by looking at the first token of the line
// The token is key
// The value is val
// Screen out the needed header lines
if (!strcmp(key, "Connection")) {
if (!strcmp(val, "Keep-Alive"))
keepalive = true;
} else if (!strcmp(key, "Host")) {
parseHost(val);
} else if (!strcmp(key, "Range")) {
parseContentRange(val);
} else if (!strcmp(key, "Content-Length")) {
length = atoll(val);
} else if (!strcmp(key, "Destination")) {
destination.assign(val, line+len-val);
trim(destination);
} else if (!strcmp(key, "Depth")) {
depth = -1;
if (strcmp(val, "infinity"))
depth = atoll(val);
} else if (!strcmp(key, "Expect") && strstr(val, "100-continue")) {
sendcontinue = true;
}
line[pos] = ':';
}
return 0;
}
int XrdHttpReq::parseHost(char *line) {
host = line;
trim(host);
return 0;
}
int XrdHttpReq::parseContentRange(char *line) {
int j;
char *str1, *saveptr1, *token;
for (j = 1, str1 = line;; j++, str1 = NULL) {
token = strtok_r(str1, " ,\n=", &saveptr1);
if (token == NULL)
break;
//printf("%d: %s\n", j, token);
if (!strlen(token)) continue;
parseRWOp(token);
}
return j;
}
int XrdHttpReq::parseRWOp(char *str) {
ReadWriteOp o1;
int j;
char *saveptr2, *str2, *subtoken, *endptr;
bool ok = false;
for (str2 = str, j = 0;; str2 = NULL, j++) {
subtoken = strtok_r(str2, "-", &saveptr2);
if (subtoken == NULL)
break;
switch (j) {
case 0:
o1.bytestart = strtoll(subtoken, &endptr, 0);
if (!o1.bytestart && (endptr == subtoken)) o1.bytestart = -1;
break;
case 1:
o1.byteend = strtoll(subtoken, &endptr, 0);
if (!o1.byteend && (endptr == subtoken)) o1.byteend = -1;
ok = true;
break;
default:
// Malformed!
ok = false;
break;
}
}
// This can be largely optimized
if (ok) {
kXR_int32 len_ok = 0;
long long sz = o1.byteend - o1.bytestart + 1;
kXR_int32 newlen = sz;
if (filesize > 0)
newlen = (kXR_int32) min(filesize - o1.bytestart, sz);
rwOps.push_back(o1);
while (len_ok < newlen) {
ReadWriteOp nfo;
int len = min(newlen - len_ok, READV_MAXCHUNKSIZE);
nfo.bytestart = o1.bytestart + len_ok;
nfo.byteend = nfo.bytestart + len - 1;
len_ok += len;
rwOps_split.push_back(nfo);
}
}
return j;
}
int XrdHttpReq::parseFirstLine(char *line, int len) {
char *key = line;
int pos;
// Do the naive parsing
if (!line) return -1;
// Look for the first space-delimited token
char *p = strchr((char *) line, (int) ' ');
if (!p) {
request = rtMalformed;
return -1;
}
// The first token cannot be too long
pos = p - line;
if (pos > MAX_TK_LEN - 1) {
request = rtMalformed;
return -2;
}
// the first token must be non empty
if (pos > 0) {
line[pos] = 0;
char *val = line + pos + 1;
// Here we are supposed to initialize whatever flag or variable that is needed
// by looking at the first token of the line
// The token is key
// The remainder is val, look for the resource
p = strchr((char *) val, (int) ' ');
if (!p) {
request = rtMalformed;
line[pos] = ' ';
return -3;
}
*p = '\0';
parseResource(val);
*p = ' ';
// Xlate the known header lines
if (!strcmp(key, "GET")) {
request = rtGET;
} else if (!strcmp(key, "HEAD")) {
request = rtHEAD;
} else if (!strcmp(key, "PUT")) {
request = rtPUT;
} else if (!strcmp(key, "PATCH")) {
request = rtPATCH;
} else if (!strcmp(key, "OPTIONS")) {
request = rtOPTIONS;
} else if (!strcmp(key, "DELETE")) {
request = rtDELETE;
} else if (!strcmp(key, "PROPFIND")) {
request = rtPROPFIND;
} else if (!strcmp(key, "MKCOL")) {
request = rtMKCOL;
} else if (!strcmp(key, "MOVE")) {
request = rtMOVE;
} else {
request = rtUnknown;
}
line[pos] = ' ';
}
return 0;
}
//___________________________________________________________________________
void XrdHttpReq::clientMarshallReadAheadList(int nitems) {
// This function applies the network byte order on the
// vector of read-ahead information
kXR_int64 tmpl;
for (int i = 0; i < nitems; i++) {
memcpy(&tmpl, &(ralist[i].offset), sizeof (kXR_int64));
tmpl = htonll(tmpl);
memcpy(&(ralist[i].offset), &tmpl, sizeof (kXR_int64));
ralist[i].rlen = htonl(ralist[i].rlen);
}
}
//___________________________________________________________________________
void XrdHttpReq::clientUnMarshallReadAheadList(int nitems) {
// This function applies the network byte order on the
// vector of read-ahead information
kXR_int64 tmpl;
for (int i = 0; i < nitems; i++) {
memcpy(&tmpl, &(ralist[i].offset), sizeof (kXR_int64));
tmpl = ntohll(tmpl);
memcpy(&(ralist[i].offset), &tmpl, sizeof (kXR_int64));
ralist[i].rlen = ntohl(ralist[i].rlen);
}
}
int XrdHttpReq::ReqReadV() {
kXR_int64 total_len = 0;
rwOpPartialDone = 0;
// Now we build the protocol-ready read ahead list
// and also put the correct placeholders inside the cache
int n = rwOps_split.size();
if (!ralist) ralist = (readahead_list *) malloc(n * sizeof (readahead_list));
int j = 0;
for (int i = 0; i < n; i++) {
// We can suppose that we know the length of the file
// Hence we can sort out requests that are out of boundary or trim them
if (rwOps_split[i].bytestart > filesize) continue;
if (rwOps_split[i].byteend > filesize - 1) rwOps_split[i].byteend = filesize - 1;
memcpy(&(ralist[j].fhandle), this->fhandle, 4);
ralist[j].offset = rwOps_split[i].bytestart;
ralist[j].rlen = rwOps_split[i].byteend - rwOps_split[i].bytestart + 1;
total_len += ralist[j].rlen;
j++;
}
if (j > 0) {
// Prepare a request header
memset(&xrdreq, 0, sizeof (xrdreq));
xrdreq.header.requestid = htons(kXR_readv);
xrdreq.readv.dlen = htonl(j * sizeof (struct readahead_list));
clientMarshallReadAheadList(j);
}
return (j * sizeof (struct readahead_list));
}
std::string XrdHttpReq::buildPartialHdr(long long bytestart, long long byteend, long long filesize, char *token) {
ostringstream s;
s << "\r\n--" << token << "\r\n";
s << "Content-type: text/plain; charset=UTF-8\r\n";
s << "Content-range: bytes " << bytestart << "-" << byteend << "/" << filesize << "\r\n\r\n";
return s.str();
}
std::string XrdHttpReq::buildPartialHdrEnd(char *token) {
ostringstream s;
s << "\r\n--" << token << "--\r\n";
return s.str();
}
bool XrdHttpReq::Data(XrdXrootd::Bridge::Context &info, //!< the result context
const
struct iovec *iovP, //!< pointer to data array
int iovN, //!< array count
int iovL, //!< byte count
bool final //!< true -> final result
) {
TRACE(REQ, " XrdHttpReq::Data! final=" << final);
this->xrdresp = kXR_ok;
this->iovP = iovP;
this->iovN = iovN;
this->iovL = iovL;
this->final = final;
if (PostProcessHTTPReq(final)) reset();
return true;
};
int XrdHttpReq::File(XrdXrootd::Bridge::Context &info, //!< the result context
int dlen //!< byte count
) {
//prot->SendSimpleResp(200, NULL, NULL, NULL, dlen);
int rc = info.Send(0, 0, 0, 0);
TRACE(REQ, " XrdHttpReq::File dlen:" << dlen << " send rc:" << rc);
return true;
};
bool XrdHttpReq::Done(XrdXrootd::Bridge::Context & info) {
TRACE(REQ, " XrdHttpReq::Done");
xrdresp = kXR_ok;
this->iovN = 0;
if (PostProcessHTTPReq(true)) reset();
return true;
};
bool XrdHttpReq::Error(XrdXrootd::Bridge::Context &info, //!< the result context
int ecode, //!< the "kXR" error code
const char *etext //!< associated error message
) {
TRACE(REQ, " XrdHttpReq::Error");
xrdresp = kXR_error;
xrderrcode = (XErrorCode) ecode;
this->etext = etext;
if (PostProcessHTTPReq()) reset();
return false;
};
bool XrdHttpReq::Redir(XrdXrootd::Bridge::Context &info, //!< the result context
int port, //!< the port number
const char *hname //!< the destination host
) {
char buf[512];
char hash[512];
hash[0] = '\0';
if (prot->isdesthttps)
redirdest = "Location: https://";
else
redirdest = "Location: http://";
redirdest += hname;
if (port) {
sprintf(buf, ":%d", port);
redirdest += buf;
}
redirdest += resource.c_str();
TRACE(REQ, " XrdHttpReq::Redir Redirecting to " << redirdest);
time_t timenow = 0;
if (!prot->isdesthttps && prot->ishttps) {
// If the destination is not https, then we suppose that it
// will need this token to fill its authorization info
timenow = time(0);
calcHashes(hash, this->resource.c_str(), (kXR_int16) request,
&prot->SecEntity,
timenow,
prot->secretkey);
}
if (hash[0]) {
appendOpaque(redirdest, &prot->SecEntity, hash, timenow);
} else
appendOpaque(redirdest, 0, 0, 0);
prot->SendSimpleResp(302, NULL, (char *) redirdest.c_str(), 0, 0);
reset();
return false;
};
// Appends the opaque info that we have
void XrdHttpReq::appendOpaque(XrdOucString &s, XrdSecEntity *secent, char *hash, time_t tnow) {
int l = 0;
char * p = 0;
if (opaque)
p = opaque->Env(l);
if ((l < 2) && !hash) return;
s = s + "?";
if (p && (l > 1)) s = s + (p + 1);
if (hash) {
if (l > 1) s += "&";
s += "xrdhttptk=";
s += hash;
s += "&xrdhttptime=";
char buf[32];
sprintf(buf, "%ld", tnow);
s += buf;
if (secent) {
if (secent->name) {
s += "&xrdhttpname=";
char *s1 = quote(secent->name);
s += s1;
free(s1);
}
if (secent->vorg) {
s += "&xrdhttpvorg=";
s += secent->vorg;
}
// if (secent->host) {
// s += "&xrdhttphost=";
// s += secent->host;
// }
}
}
}
// Extracts the opaque info from the given url
void XrdHttpReq::parseResource(char *res) {
// Look for the first '?'
char *p = strchr(res, '?');
// Not found, then it's just a filename
if (!p) {
resource.assign(res, 0, MAX_RESOURCE_LEN);
return;
}
// Whatever comes before '?' is a filename
int cnt = p - res; // Number of chars to copy
resource.assign(res, 0, cnt - 1);
// Whatever comes after is opaque data to be parsed
if (strlen(p) > 1)
opaque = new XrdOucEnv(p + 1);
}
int XrdHttpReq::ProcessHTTPReq() {
kXR_int32 l;
//
// Prepare the data part
//
switch (request) {
case XrdHttpReq::rtUnknown:
case XrdHttpReq::rtMalformed:
{
prot->SendSimpleResp(400, NULL, NULL, (char *) "Request malformed", 0);
reset();
return -1;
}
case XrdHttpReq::rtHEAD:
{
// Do a Stat
if (prot->doStat((char *) resource.c_str())) {
prot->SendSimpleResp(404, NULL, NULL, (char *) "Could not run request.", 0);
return -1;
}
return 1;
}
case XrdHttpReq::rtGET:
{
if (prot->embeddedstatic && resource.beginswith("/static/")) {
// This is a request for an embedded static resource
// The sysadmin can always use the file system if he wants to put his own.
// In that case he has to respect the behavior of
// the xrootd with the oss.localroot and all.export directives, which is
// not very practical.
if (resource == "/static/css/xrdhttp.css") {
prot->SendSimpleResp(200, NULL, NULL, (char *) static_css_xrdhttp_css, static_css_xrdhttp_css_len);
reset();
return 1;
}
if (resource == "/static/icons/xrdhttp.ico") {
prot->SendSimpleResp(200, NULL, NULL, (char *) favicon_ico, favicon_ico_len);
reset();
return 1;
}
}
switch (reqstate) {
case 0: // Stat()
// Do a Stat
if (prot->doStat((char *) resource.c_str())) {
XrdOucString errmsg = "Error stating";
errmsg += resource.c_str();
prot->SendSimpleResp(404, NULL, NULL, (char *) errmsg.c_str(), 0);
return -1;
}
return 0;
case 1: // Open() or dirlist
{
if (fileflags & kXR_isDir) {
if (prot->listdeny) {
prot->SendSimpleResp(503, NULL, NULL, (char *) "Listings are disabled.", 0);
return -1;
}
if (prot->listredir) {
XrdOucString s = "Location: ";
s.append(prot->listredir);
if (s.endswith('/'))
s.erasefromend(1);
s.append(resource);
appendOpaque(s, 0, 0, 0);
prot->SendSimpleResp(302, NULL, (char *) s.c_str(), 0, 0);
return -1;
}
string res;
res = resource.c_str();
//res += "?xrd.dirstat=1";
// --------- DIRLIST
memset(&xrdreq, 0, sizeof (ClientRequest));
xrdreq.dirlist.requestid = htons(kXR_dirlist);
xrdreq.dirlist.options[0] = kXR_dstat;
l = res.length() + 1;
xrdreq.dirlist.dlen = htonl(l);
if (!prot->Bridge->Run((char *) &xrdreq, (char *) res.c_str(), l)) {
prot->SendSimpleResp(404, NULL, NULL, (char *) "Could not run request.", 0);
return -1;
}
// We don't want to be invoked again after this request is finished
return 1;
} else {
// --------- OPEN
memset(&xrdreq, 0, sizeof (ClientRequest));
xrdreq.open.requestid = htons(kXR_open);
l = resource.length() + 1;
xrdreq.open.dlen = htonl(l);
xrdreq.open.mode = 0;
xrdreq.open.options = htons(kXR_retstat | kXR_open_read);
if (!prot->Bridge->Run((char *) &xrdreq, (char *) resource.c_str(), l)) {
prot->SendSimpleResp(404, NULL, NULL, (char *) "Could not run request.", 0);
return -1;
}
// We want to be invoked again after this request is finished
return 0;
}
}
case 2: // Read()
{
if (rwOps.size() <= 1) {
// No chunks or one chunk... Request the whole file or single read
// --------- READ
memset(&xrdreq, 0, sizeof (xrdreq));
xrdreq.read.requestid = htons(kXR_read);
memcpy(xrdreq.read.fhandle, fhandle, 4);
xrdreq.read.dlen = 0;
if (rwOps.size() == 0) {
xrdreq.read.offset = 0;
xrdreq.read.rlen = htonl(filesize);
} else {
xrdreq.read.offset = htonll(rwOps[0].bytestart);
xrdreq.read.rlen = htonl(rwOps[0].byteend - rwOps[0].bytestart + 1);
}
if (prot->ishttps) {
if (!prot->Bridge->setSF((kXR_char *) fhandle, false)) {
TRACE(REQ, " XrdBridge::SetSF(false) failed.");
}
}
if (!prot->Bridge->Run((char *) &xrdreq, 0, 0)) {
prot->SendSimpleResp(404, NULL, NULL, (char *) "Could not run read request.", 0);
return -1;
}
} else {
// More than one chunk to read... use readv
length = ReqReadV();
if (!prot->Bridge->Run((char *) &xrdreq, (char *) ralist, length)) {
prot->SendSimpleResp(404, NULL, NULL, (char *) "Could not run read request.", 0);
return -1;
}
}
// We want to be invoked again after this request is finished
return 0;
}
case 3: // Close()
{
// --------- READ
memset(&xrdreq, 0, sizeof (ClientRequest));
xrdreq.close.requestid = htons(kXR_close);
memcpy(xrdreq.close.fhandle, fhandle, 4);
if (!prot->Bridge->Run((char *) &xrdreq, 0, 0)) {
prot->SendSimpleResp(404, NULL, NULL, (char *) "Could not run close request.", 0);
return -1;
}
// We have finished
return 1;
}
default:
return -1;
}
}
case XrdHttpReq::rtPUT:
{
//if (prot->ishttps) {
//prot->SendSimpleResp(501, NULL, NULL, (char *) "HTTPS not supported yet for direct writing. Sorry.", 0);
//return -1;
//}
if (!fopened) {
// --------- OPEN for write!
memset(&xrdreq, 0, sizeof (ClientRequest));
xrdreq.open.requestid = htons(kXR_open);
l = resource.length() + 1;
xrdreq.open.dlen = htonl(l);
xrdreq.open.mode = htons(kXR_ur | kXR_uw | kXR_gw | kXR_gr | kXR_or);
xrdreq.open.options = htons(kXR_mkpath | kXR_open_updt | kXR_new);
if (!prot->Bridge->Run((char *) &xrdreq, (char *) resource.c_str(), l)) {
prot->SendSimpleResp(404, NULL, NULL, (char *) "Could not run request.", 0);
return -1;
}
// We want to be invoked again after this request is finished
// Only if there is data to fetch from the socket
if (prot->BuffUsed() > 0)
return 0;
return 1;
} else {
// Check if we have finished
if (writtenbytes < length) {
// --------- WRITE
memset(&xrdreq, 0, sizeof (xrdreq));
xrdreq.write.requestid = htons(kXR_write);
memcpy(xrdreq.write.fhandle, fhandle, 4);
xrdreq.write.offset = htonll(writtenbytes);
xrdreq.write.dlen = htonl(prot->BuffUsed());
TRACEI(REQ, "Writing " << prot->BuffUsed());
if (!prot->Bridge->Run((char *) &xrdreq, prot->myBuffStart, prot->BuffUsed())) {
prot->SendSimpleResp(404, NULL, NULL, (char *) "Could not run write request.", 0);
return -1;
}
if (writtenbytes + prot->BuffUsed() >= length)
// Trigger an immediate recall after this request has finished
return 0;
else
// We want to be invoked again after this request is finished
// only if there is pending data
return 1;
} else {
// --------- CLOSE
memset(&xrdreq, 0, sizeof (ClientRequest));
xrdreq.close.requestid = htons(kXR_close);
memcpy(xrdreq.close.fhandle, fhandle, 4);
if (!prot->Bridge->Run((char *) &xrdreq, 0, 0)) {
prot->SendSimpleResp(404, NULL, NULL, (char *) "Could not run close request.", 0);
return -1;
}
// We have finished
return 1;
}
}
break;
}
case XrdHttpReq::rtOPTIONS:
{
prot->SendSimpleResp(200, NULL, (char *) "DAV: 1\r\nDAV: <http://apache.org/dav/propset/fs/1>\r\nAllow: HEAD,GET,PUT,PROPFIND,DELETE,OPTIONS", NULL, 0);
reset();
return 1;
}
case XrdHttpReq::rtDELETE:
{
switch (reqstate) {
case 0: // Stat()
{
// --------- STAT is always the first step
memset(&xrdreq, 0, sizeof (ClientRequest));
xrdreq.stat.requestid = htons(kXR_stat);
string s = resource.c_str();
l = resource.length() + 1;
xrdreq.stat.dlen = htonl(l);
if (!prot->Bridge->Run((char *) &xrdreq, (char *) resource.c_str(), l)) {
prot->SendSimpleResp(501, NULL, NULL, (char *) "Could not run request.", 0);
return -1;
}
// We need to be invoked again to complete the request
return 0;
}
default:
if (fileflags & kXR_isDir) {
// --------- RMDIR
memset(&xrdreq, 0, sizeof (ClientRequest));
xrdreq.rmdir.requestid = htons(kXR_rmdir);
string s = resource.c_str();
l = s.length() + 1;
xrdreq.rmdir.dlen = htonl(l);
if (!prot->Bridge->Run((char *) &xrdreq, (char *) s.c_str(), l)) {
prot->SendSimpleResp(501, NULL, NULL, (char *) "Could not run rmdir request.", 0);
return -1;
}
} else {
// --------- DELETE
memset(&xrdreq, 0, sizeof (ClientRequest));
xrdreq.rm.requestid = htons(kXR_rm);