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XrdHttpProtocol.cc
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XrdHttpProtocol.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/>.
//------------------------------------------------------------------------------
#include "XrdVersion.hh"
#include "Xrd/XrdBuffer.hh"
#include "Xrd/XrdLink.hh"
#include "XProtocol/XProtocol.hh"
#include "XrdOuc/XrdOucStream.hh"
#include "XrdOuc/XrdOucEnv.hh"
#include "XrdSys/XrdSysTimer.hh"
#include "XrdSys/XrdSysPlugin.hh"
#include "XrdHttpTrace.hh"
#include "XrdHttpProtocol.hh"
//#include "XrdXrootd/XrdXrootdStats.hh"
#include <sys/stat.h>
#include "XrdHttpUtils.hh"
#include "XrdHttpSecXtractor.hh"
#include <openssl/err.h>
#include <vector>
#include <arpa/inet.h>
#define XRHTTP_TK_GRACETIME 600
/******************************************************************************/
/* G l o b a l s */
/******************************************************************************/
//
// Static stuff
//
int XrdHttpProtocol::hailWait = 0;
int XrdHttpProtocol::readWait = 0;
int XrdHttpProtocol::Port = 1094;
char *XrdHttpProtocol::Port_str = 0;
char *XrdHttpProtocol::Addr_str = 0;
int XrdHttpProtocol::Window = 0;
char *XrdHttpProtocol::SecLib = 0;
//XrdXrootdStats *XrdHttpProtocol::SI = 0;
char *XrdHttpProtocol::sslcert = 0;
char *XrdHttpProtocol::sslkey = 0;
char *XrdHttpProtocol::sslcadir = 0;
char *XrdHttpProtocol::listredir = 0;
bool XrdHttpProtocol::listdeny = false;
bool XrdHttpProtocol::embeddedstatic = true;
kXR_int32 XrdHttpProtocol::myRole = kXR_isManager;
bool XrdHttpProtocol::selfhttps2http = false;
bool XrdHttpProtocol::isdesthttps = false;
char *XrdHttpProtocol::sslcafile = 0;
char *XrdHttpProtocol::secretkey = 0;
int XrdHttpProtocol::sslverifydepth = 9;
SSL_CTX *XrdHttpProtocol::sslctx = 0;
BIO *XrdHttpProtocol::sslbio_err = 0;
XrdCryptoFactory *XrdHttpProtocol::myCryptoFactory = 0;
XrdHttpSecXtractor *XrdHttpProtocol::secxtractor = 0;
static const unsigned char *s_server_session_id_context = (const unsigned char *) "XrdHTTPSessionCtx";
static int s_server_session_id_context_len = 18;
XrdScheduler *XrdHttpProtocol::Sched = 0; // System scheduler
XrdBuffManager *XrdHttpProtocol::BPool = 0; // Buffer manager
XrdSysError XrdHttpProtocol::eDest = 0; // Error message handler
XrdSecService *XrdHttpProtocol::CIA = 0; // Authentication Server
/******************************************************************************/
/* P r o t o c o l M a n a g e m e n t S t a c k s */
/******************************************************************************/
XrdObjectQ<XrdHttpProtocol>
XrdHttpProtocol::ProtStack("ProtStack",
"xrootd protocol anchor");
/******************************************************************************/
/* P r o t o c o l L o a d e r */
/* X r d g e t P r o t o c o l */
/******************************************************************************/
// This protocol can live in a shared library. The interface below is used by
// the protocol driver to obtain a copy of the protocol object that can be used
// to decide whether or not a link is talking a particular protocol.
//
XrdVERSIONINFO(XrdgetProtocol, xrootd);
extern "C" {
XrdProtocol *XrdgetProtocol(const char *pname, char *parms,
XrdProtocol_Config *pi) {
XrdProtocol *pp = 0;
const char *txt = "completed.";
// Put up the banner
//
pi->eDest->Say("Copr. 2012 CERN IT, an HTTP implementation for the XROOTD framework.");
pi->eDest->Say("++++++ HTTP protocol initialization started.");
// Return the protocol object to be used if static init succeeds
//
if (XrdHttpProtocol::Configure(parms, pi))
pp = (XrdProtocol *)new XrdHttpProtocol(false);
else txt = "failed.";
pi->eDest->Say("------ HTTP protocol initialization ", txt);
return pp;
}
}
/******************************************************************************/
/* */
/* P r o t o c o l P o r t D e t e r m i n a t i o n */
/* X r d g e t P r o t o c o l P o r t */
/******************************************************************************/
// This function is called early on to determine the port we need to use. The
// default is ostensibly 1094 but can be overidden; which we allow.
//
XrdVERSIONINFO(XrdgetProtocolPort, xrootd);
extern "C" {
int XrdgetProtocolPort(const char *pname, char *parms, XrdProtocol_Config *pi) {
// Figure out what port number we should return. In practice only one port
// number is allowed. However, we could potentially have a clustered port
// and several unclustered ports. So, we let this practicality slide.
//
if (pi->Port < 0) return 1094;
return pi->Port;
}
}
/******************************************************************************/
/* X r d H T T P P r o t o c o l C l a s s */
/******************************************************************************/
/******************************************************************************/
/* C o n s t r u c t o r */
/******************************************************************************/
XrdHttpProtocol::XrdHttpProtocol(bool imhttps)
: XrdProtocol("HTTP protocol handler"), ProtLink(this),
SecEntity(""), CurrentReq(this) {
myBuff = 0;
Reset();
ishttps = imhttps;
}
/******************************************************************************/
/* A s s i g n m e n t O p e r a t o r */
/******************************************************************************/
XrdHttpProtocol XrdHttpProtocol::operator =(const XrdHttpProtocol &rhs) {
return *this;
}
/******************************************************************************/
/* M a t c h */
/******************************************************************************/
#define TRACELINK lp
XrdProtocol *XrdHttpProtocol::Match(XrdLink *lp) {
char mybuf[16], mybuf2[1024];
XrdHttpProtocol *hp;
int dlen;
bool myishttps = false;
// Peek at the first 20 bytes of data
//
if ((dlen = lp->Peek(mybuf, (int) sizeof (mybuf), hailWait)) < (int) sizeof (mybuf)) {
if (dlen <= 0) lp->setEtext("handshake not received");
return (XrdProtocol *) 0;
}
mybuf[dlen - 1] = '\0';
// Trace the data
//
TRACEI(DEBUG, "received dlen: " << dlen);
//TRACEI(REQ, "received buf: " << mybuf);
mybuf2[0] = '\0';
for (int i = 0; i < dlen; i++) {
char mybuf3[16];
sprintf(mybuf3, "%.02d ", mybuf[i]);
strcat(mybuf2, mybuf3);
}
TRACEI(DEBUG, "received dump: " << mybuf2);
// Decide if it looks http or not. For now we are happy if all the received characters are alphanumeric
bool ismine = true;
for (int i = 0; i < dlen - 1; i++)
if (!isprint(mybuf[i]) && (mybuf[i] != '\r') && (mybuf[i] != '\n')) {
ismine = false;
TRACEI(DEBUG, "This does not look like http at pos " << i);
break;
}
// If it does not look http then look if it looks like https
if ((!ismine) && (dlen >= 4)) {
char check[4] = {00, 00, 00, 00};
if (memcmp(mybuf, check, 4)) {
if (sslcert) {
ismine = true;
myishttps = true;
TRACEI(DEBUG, "This may look like https");
} else {
TRACEI(ALL, "This may look like https, but https is not configured");
}
}
}
if (!ismine) {
TRACEI(DEBUG, "This does not look like https. Protocol not matched.");
return (XrdProtocol *) 0;
}
// It does look http or https...
// Get a protocol object off the stack (if none, allocate a new one)
//
TRACEI(REQ, "Protocol matched. https: " << myishttps);
if (!(hp = ProtStack.Pop())) hp = new XrdHttpProtocol(myishttps);
else
hp->ishttps = myishttps;
// Bind the protocol to the link and return the protocol
//
hp->Link = lp;
return (XrdProtocol *) hp;
}
/******************************************************************************/
/* G e t V O M S D a t a */
/******************************************************************************/
int XrdHttpProtocol::GetVOMSData(XrdLink *lp) {
SecEntity.host = GetClientIPStr();
// Invoke our instance of the Security exctractor plugin
// This will fill the XrdSec thing with VOMS info, if VOMS is
// installed. If we have no sec extractor then do nothing, just plain https
// will work.
if (secxtractor) secxtractor->GetSecData(lp, SecEntity, ssl);
else {
X509 *peer_cert;
// No external plugin, hence we fill our XrdSec with what we can do here
peer_cert = SSL_get_peer_certificate(ssl);
TRACEI(DEBUG, " SSL_get_peer_certificate returned :" << peer_cert);
if (peer_cert && peer_cert->name) {
TRACEI(DEBUG, " Setting Username :" << peer_cert->name);
lp->setID(peer_cert->name, 0);
// Here we should fill the SecEntity instance with the DN and the voms stuff
SecEntity.name = strdup((char *) peer_cert->name);
}
if (peer_cert) X509_free(peer_cert);
}
return 0;
}
char *XrdHttpProtocol::GetClientIPStr() {
char buf[256];
buf[0] = '\0';
if (!Link) return strdup("unknown");
XrdNetAddrInfo *ai = Link->AddrInfo();
if (!ai) return strdup("unknown");
if (!Link->AddrInfo()->Format(buf, 255, XrdNetAddrInfo::fmtAddr)) return strdup("unknown");
return strdup(buf);
}
/******************************************************************************/
/* P r o c e s s */
/******************************************************************************/
#undef TRACELINK
#define TRACELINK Link
int XrdHttpProtocol::Process(XrdLink *lp) // We ignore the argument here
{
int rc = 0;
TRACEI(DEBUG, " Process. lp:" << lp << " reqstate: " << CurrentReq.reqstate);
if (!myBuff || !myBuff->buff || !myBuff->bsize) {
TRACE(ALL, " Process. No buffer available. Internal error.");
return -1;
}
if (!SecEntity.host) {
char *nfo = GetClientIPStr();
if (nfo) {
TRACEI(REQ, " Setting host: " << nfo);
SecEntity.host = nfo;
}
}
// If https then check independently for the ssl handshake
if (ishttps && !ssldone) {
ssl = SSL_new(sslctx);
if (!ssl) {
TRACEI(DEBUG, " SSL_new returned NULL");
ERR_print_errors(sslbio_err);
return -1;
}
SSL_set_fd(ssl, Link->FDnum());
struct timeval tv;
tv.tv_sec = readWait;
tv.tv_usec = 0;
setsockopt(Link->FDnum(), SOL_SOCKET, SO_RCVTIMEO, (struct timeval *)&tv, sizeof(struct timeval));
setsockopt(Link->FDnum(), SOL_SOCKET, SO_SNDTIMEO, (struct timeval *)&tv, sizeof(struct timeval));
int res = SSL_accept(ssl);
TRACEI(DEBUG, " SSL_accept returned :" << res);
ERR_print_errors(sslbio_err);
if (res < 0) {
SSL_free(ssl);
ssl = 0;
return -1;
}
// Get the voms string and auth information
GetVOMSData(Link);
ERR_print_errors(sslbio_err);
res = SSL_get_verify_result(ssl);
TRACEI(DEBUG, " SSL_get_verify_result returned :" << res);
ERR_print_errors(sslbio_err);
if (res != X509_V_OK) return -1;
ssldone = true;
}
if (!DoingLogin) {
// Re-invocations triggered by the bridge have lp==0
// In this case we keep track of a different request state
if (lp) {
// This is an invocation that was triggered by a socket event
// Read all the data that is available, throw it into the buffer
if ((rc = getDataOneShot(BuffAvailable())) < 0) {
// Error -> exit
return -1;
}
// If we need more bytes, let's wait for another invokation
if (BuffUsed() < ResumeBytes) return 1;
} else
CurrentReq.reqstate++;
}
DoingLogin = false;
// Read the next request header, that is, read until a double CRLF is found
if (!CurrentReq.headerok) {
// Read as many lines as possible into the buffer. An empty line breaks
while ((rc = BuffgetLine(tmpline)) > 0) {
TRACE(DEBUG, " rc:" << rc << " got hdr line: " << tmpline);
if ((rc == 2) && (tmpline[rc - 1] == '\n')) {
CurrentReq.headerok = true;
TRACE(DEBUG, " rc:" << rc << " detected header end.");
break;
}
if (CurrentReq.request == CurrentReq.rtUnknown)
CurrentReq.parseFirstLine((char *)tmpline.c_str(), rc);
else
CurrentReq.parseLine((char *)tmpline.c_str(), rc);
}
// Here we have CurrentReq loaded with the header, or its relevant fields
if (!CurrentReq.headerok) {
TRACEI(REQ, " rc:" << rc << "Header not yet complete.");
// Waiting for more data
return 1;
}
}
// If we are in self-redirect mode, then let's do it
if (ishttps && ssldone && selfhttps2http) {
char hash[512];
time_t timenow = time(0);
calcHashes(hash, CurrentReq.resource.c_str(), (kXR_int16) CurrentReq.request,
&SecEntity,
timenow,
secretkey);
if (hash[0]) {
// Workaround... delete the previous opaque information
if (CurrentReq.opaque) {
delete CurrentReq.opaque;
CurrentReq.opaque = 0;
}
TRACEI(REQ, " rc:" << rc << " self-redirecting to http with security token.");
XrdOucString dest = "Location: http://";
// Here I should put the IP addr of the server
Link->Host();
dest += Addr_str;
dest += ":";
dest += Port_str;
dest += CurrentReq.resource.c_str();
CurrentReq.appendOpaque(dest, &SecEntity, hash, timenow);
SendSimpleResp(302, NULL, (char *) dest.c_str(), 0, 0);
CurrentReq.reset();
return 1;
}
}
// If this is not https, then extract the signed information from the url
// and fill the SecEntity structure as if we were using https
if (!ishttps && !ssldone) {
if (CurrentReq.opaque) {
char * tk = CurrentReq.opaque->Get("xrdhttptk");
// If there is a hash then we use it as authn info
if (tk) {
time_t tim = 0;
char * t = CurrentReq.opaque->Get("xrdhttptime");
if (t) tim = atoi(t);
if (!t) {
TRACEI(REQ, " xrdhttptime not specified. Authentication failed.");
return -1;
}
if (abs((time(0) - tim) > XRHTTP_TK_GRACETIME)) {
TRACEI(REQ, " Token expired. Authentication failed.");
return -1;
}
// Fill the Secentity from the fields in the URL:name, vo, host
char *nfo;
nfo = CurrentReq.opaque->Get("xrdhttpvorg");
if (nfo) {
TRACEI(REQ, " Setting vorg: " << nfo);
SecEntity.vorg = strdup(nfo);
}
nfo = CurrentReq.opaque->Get("xrdhttpname");
if (nfo) {
TRACEI(REQ, " Setting name: " << nfo);
SecEntity.name = unquote(nfo);
}
//nfo = CurrentReq.opaque->Get("xrdhttphost");
// TODO: compare the xrdhttphost with the real client IP
// If they are different then reject
char hash[512];
calcHashes(hash, CurrentReq.resource.c_str(), (kXR_int16) CurrentReq.request,
&SecEntity,
tim,
secretkey);
if (compareHash(hash, tk)) {
TRACEI(REQ, " Invalid tk. Authentication failed.");
return -1;
}
} else {
// Client is plain http. If we have a secret key then we reject it
if (secretkey) {
TRACEI(ALL, " Rejecting plain http with no valid token as we have a secretkey.");
return -1;
}
}
} else {
// Client is plain http. If we have a secret key then we reject it
if (secretkey) {
TRACEI(ALL, " Rejecting plain http with no valid token as we have a secretkey.");
return -1;
}
}
ssldone = true;
}
// Now we have everything that is needed to try the login
if (!Bridge) {
Bridge = XrdXrootd::Bridge::Login(&CurrentReq, Link, &SecEntity, "unnamed", "XrdHttp");
if (!Bridge) {
TRACEI(REQ, " Autorization failed.");
return -1;
}
// Let the bridge process the login, and then reinvoke us
DoingLogin = true;
return 0;
}
// Compute and send the response. This may involve further reading from the socket
rc = CurrentReq.ProcessHTTPReq();
if (rc < 0)
CurrentReq.reset();
TRACEI(REQ, "Process is exiting rc:" << rc);
return rc;
}
/******************************************************************************/
/* R e c y c l e */
/******************************************************************************/
#undef TRACELINK
#define TRACELINK Link
void XrdHttpProtocol::Recycle(XrdLink *lp, int csec, const char *reason) {
// Release all appendages
//
Cleanup();
// Set fields to starting point (debugging mostly)
//
Reset();
// Push ourselves on the stack
//
ProtStack.Push(&ProtLink);
}
int XrdHttpProtocol::Stats(char *buff, int blen, int do_sync) {
// Synchronize statistics if need be
//
// if (do_sync) {
//
// SI->statsMutex.Lock();
// SI->readCnt += numReads;
// cumReads += numReads;
// numReads = 0;
// SI->prerCnt += numReadP;
// cumReadP += numReadP;
// numReadP = 0;
// SI->rvecCnt += numReadV;
// cumReadV += numReadV;
// numReadV = 0;
// SI->rsegCnt += numSegsV;
// cumSegsV += numSegsV;
// numSegsV = 0;
// SI->writeCnt += numWrites;
// cumWrites += numWrites;
// numWrites = 0;
// SI->statsMutex.UnLock();
// }
//
// // Now return the statistics
// //
// return SI->Stats(buff, blen, do_sync);
return 0;
}
/******************************************************************************/
/* C o n f i g */
/******************************************************************************/
#define TS_Xeq(x,m) (!strcmp(x,var)) GoNo = m(Config)
int XrdHttpProtocol::Config(const char *ConfigFN) {
XrdOucEnv myEnv;
XrdOucStream Config(&eDest, getenv("XRDINSTANCE"), &myEnv, "=====> ");
char *var;
int cfgFD, GoNo, NoGo = 0, ismine;
// Open and attach the config file
//
if ((cfgFD = open(ConfigFN, O_RDONLY, 0)) < 0)
return eDest.Emsg("Config", errno, "open config file", ConfigFN);
Config.Attach(cfgFD);
// Process items
//
while ((var = Config.GetMyFirstWord())) {
if ((ismine = !strncmp("http.", var, 5)) && var[5]) var += 5;
else if ((ismine = !strcmp("all.export", var))) var += 4;
else if ((ismine = !strcmp("all.pidpath", var))) var += 4;
else if ((ismine = !strcmp("all.seclib", var))) var += 4;
if (ismine) {
if TS_Xeq("seclib", xsecl);
else if TS_Xeq("trace", xtrace);
else if TS_Xeq("cert", xsslcert);
else if TS_Xeq("key", xsslkey);
else if TS_Xeq("cadir", xsslcadir);
else if TS_Xeq("cafile", xsslcafile);
else if TS_Xeq("secretkey", xsecretkey);
else if TS_Xeq("desthttps", xdesthttps);
else if TS_Xeq("secxtractor", xsecxtractor);
else if TS_Xeq("selfhttps2http", xselfhttps2http);
else if TS_Xeq("embeddedstatic", xembeddedstatic);
else if TS_Xeq("listingredir", xlistredir);
else if TS_Xeq("listingdeny", xlistdeny);
else {
eDest.Say("Config warning: ignoring unknown directive '", var, "'.");
Config.Echo();
continue;
}
if (GoNo) {
Config.Echo();
NoGo = 1;
}
}
}
if (sslcert)
InitSecurity();
return NoGo;
}
/******************************************************************************/
/* P r i v a t e M e t h o d s */
/******************************************************************************/
/// Copy a full line of text from the buffer into dest. Zero if no line can be found in the buffer
int XrdHttpProtocol::BuffgetLine(XrdOucString &dest) {
dest = "";
// Easy case
if (myBuffEnd >= myBuffStart) {
int l = 0;
for (char *p = myBuffStart; p < myBuffEnd; p++) {
l++;
if (*p == '\n') {
dest.assign(myBuffStart, 0, l-1);
//strncpy(dest, myBuffStart, l);
//dest[l] = '\0';
BuffConsume(l);
//if (dest[l-1] == '\n') dest[l - 1] = '\0';
return l;
}
}
return 0;
} else {
// More complex case... we have to do it in two segments
// Segment 1: myBuffStart->myBuff->buff+myBuff->bsize
int l = 0;
for (char *p = myBuffStart; p < myBuff->buff + myBuff->bsize; p++) {
l++;
if ((*p == '\n') || (*p == '\0')) {
dest.assign(myBuffStart, 0, l-1);
//strncpy(dest, myBuffStart, l);
BuffConsume(l);
//if (dest[l-1] == '\n') dest[l - 1] = '\0';
return l;
}
}
// We did not find the \n, let's keep on searching in the 2nd segment
// Segment 2: myBuff->buff --> myBuffEnd
l = 0;
for (char *p = myBuff->buff; p < myBuffEnd; p++) {
l++;
if ((*p == '\n') || (*p == '\0')) {
// Remember the 1st segment
int l1 = myBuff->buff + myBuff->bsize - myBuffStart;
dest.assign(myBuffStart, 0, l1-1);
//strncpy(dest, myBuffStart, l1);
BuffConsume(l1);
dest.insert(myBuffStart, l1, l-1);
//strncpy(dest + l1, myBuffStart, l);
//dest[l + l1] = '\0';
BuffConsume(l);
//if (dest[l + l1 - 1] == '\n') dest[l + l1 - 1] = '\0';
return l + l1;
}
}
}
return 0;
}
int XrdHttpProtocol::getDataOneShot(int blen, bool wait) {
int rlen, maxread;
// Get up to blen bytes from the connection. Put them into mybuff.
// This primitive, for the way it is used, is not supposed to block if wait=false
// Returns:
// 2: no space left in buffer
// 1: timeout
// -1: error
// 0: everything read correctly
// Check for buffer overflow first
maxread = min(blen, BuffAvailable());
TRACE(DEBUG, "getDataOneShot BuffAvailable: " << BuffAvailable() << " maxread: " << maxread);
if (!maxread)
return 2;
if (ishttps) {
int sslavail = maxread;
if (!wait) {
int l = SSL_pending(ssl);
if (l > 0)
sslavail = min(maxread, SSL_pending(ssl));
}
if (sslavail < 0) {
Link->setEtext("link SSL_pending error");
ERR_print_errors(sslbio_err);
return -1;
}
TRACE(DEBUG, "getDataOneShot sslavail: " << sslavail);
if (sslavail <= 0) return 0;
if (myBuffEnd - myBuff->buff >= myBuff->bsize) {
TRACE(DEBUG, "getDataOneShot Buffer panic");
myBuffEnd = myBuff->buff;
}
rlen = SSL_read(ssl, myBuffEnd, sslavail);
if (rlen <= 0) {
Link->setEtext("link SSL read error");
ERR_print_errors(sslbio_err);
return -1;
}
} else {
if (myBuffEnd - myBuff->buff >= myBuff->bsize) {
TRACE(DEBUG, "getDataOneShot Buffer panic");
myBuffEnd = myBuff->buff;
}
if (wait)
rlen = Link->Recv(myBuffEnd, maxread, readWait);
else
rlen = Link->Recv(myBuffEnd, maxread);
if (rlen == 0) {
Link->setEtext("link read error or closed");
return -1;
}
if (rlen < 0) {
Link->setEtext("link timeout");
return 1;
}
}
myBuffEnd += rlen;
TRACE(REQ, "read " << rlen << " of " << blen << " bytes");
return 0;
}
/// How many bytes still fit into the buffer in a contiguous way
int XrdHttpProtocol::BuffAvailable() {
int r;
if (myBuffEnd >= myBuffStart)
r = myBuff->buff + myBuff->bsize - myBuffEnd;
else
r = myBuffStart - myBuffEnd;
if ((r < 0) || (r > myBuff->bsize)) {
TRACE(REQ, "internal error, myBuffAvailable: " << r << " myBuff->bsize " << myBuff->bsize);
abort();
}
return r;
}
/// How many bytes in the buffer
int XrdHttpProtocol::BuffUsed() {
int r;
if (myBuffEnd >= myBuffStart)
r = myBuffEnd - myBuffStart;
else
r = myBuff->bsize - (myBuffStart - myBuffEnd);
if ((r < 0) || (r > myBuff->bsize)) {
TRACE(REQ, "internal error, myBuffUsed: " << r << " myBuff->bsize " << myBuff->bsize);
abort();
}
return r;
}
/// How many bytes free in the buffer
int XrdHttpProtocol::BuffFree() {
return (myBuff->bsize - BuffUsed());
}
void XrdHttpProtocol::BuffConsume(int blen) {
if (blen > myBuff->bsize) {
TRACE(REQ, "internal error, BuffConsume(" << blen << ") smaller than buffsize");
abort();
}
if (blen > BuffUsed()) {
TRACE(REQ, "internal error, BuffConsume(" << blen << ") larger than BuffUsed:" << BuffUsed());
abort();
}
myBuffStart = myBuffStart + blen;
if (myBuffStart >= myBuff->buff + myBuff->bsize)
myBuffStart -= myBuff->bsize;
if (myBuffEnd >= myBuff->buff + myBuff->bsize)
myBuffEnd -= myBuff->bsize;
if (BuffUsed() == 0)
myBuffStart = myBuffEnd = myBuff->buff;
}
/// Get a pointer, valid for up to blen bytes from the buffer. Returns the n
/// of bytes that one is allowed to read
int XrdHttpProtocol::BuffgetData(int blen, char **data, bool wait) {
int rlen;
if (wait && (blen > BuffUsed())) {
TRACE(REQ, "BuffgetData: need to read " << blen - BuffUsed() << " bytes");
if (getDataOneShot(blen - BuffUsed(), true) < 0) return 0;
}
if (myBuffStart < myBuffEnd) {
rlen = min((long) blen, myBuffEnd - myBuffStart);
} else
rlen = min((long) blen, myBuff->buff + myBuff->bsize - myBuffStart);
*data = myBuffStart;
BuffConsume(rlen);
return rlen;
}
/// Send some data to the client
int XrdHttpProtocol::SendData(char *body, int bodylen) {
int r;
if (body && bodylen) {
TRACE(REQ, "Sending " << bodylen << " bytes");
if (ishttps) {
r = SSL_write(ssl, body, bodylen);
if (r <= 0) {
ERR_print_errors(sslbio_err);
return -1;
}
} else {
r = Link->Send(body, bodylen);
if (r <= 0) return -1;
}
}