/*
** Copyright (c) 2007 D. Richard Hipp
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public
** License version 2 as published by the Free Software Foundation.
**
** 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 GNU
** General Public License for more details.
**
** You should have received a copy of the GNU General Public
** License along with this library; if not, write to the
** Free Software Foundation, Inc., 59 Temple Place - Suite 330,
** Boston, MA 02111-1307, USA.
**
** Author contact information:
** drh@hwaci.com
** http://www.hwaci.com/drh/
**
*******************************************************************************
**
** This file contains code to implement the file transfer protocol.
*/
#include "config.h"
#include "xfer.h"
/*
** This structure holds information about the current state of either
** a client or a server that is participating in xfer.
*/
typedef struct Xfer Xfer;
struct Xfer {
Blob *pIn; /* Input text from the other side */
Blob *pOut; /* Compose our reply here */
Blob line; /* The current line of input */
Blob aToken[5]; /* Tokenized version of line */
Blob err; /* Error message text */
int nToken; /* Number of tokens in line */
int nIGotSent; /* Number of "igot" messages sent */
int nGimmeSent; /* Number of gimme messages sent */
int nFileSent; /* Number of files sent */
int nDeltaSent; /* Number of deltas sent */
int nFileRcvd; /* Number of files received */
int nDeltaRcvd; /* Number of deltas received */
int nDanglingFile; /* Number of dangling deltas received */
int mxSend; /* Stop sending "file" with pOut reaches this size */
};
/*
** The input blob contains a UUID. Convert it into a record ID.
** Create a phantom record if no prior record exists and
** phantomize is true.
**
** Compare to uuid_to_rid(). This routine takes a blob argument
** and does less error checking.
*/
static int rid_from_uuid(Blob *pUuid, int phantomize){
int rid = db_int(0, "SELECT rid FROM blob WHERE uuid='%b'", pUuid);
if( rid==0 && phantomize ){
rid = content_put(0, blob_str(pUuid), 0);
}
return rid;
}
/*
** The aToken[0..nToken-1] blob array is a parse of a "file" line
** message. This routine finishes parsing that message and does
** a record insert of the file.
**
** The file line is in one of the following two forms:
**
** file UUID SIZE \n CONTENT
** file UUID DELTASRC SIZE \n CONTENT
**
** The content is SIZE bytes immediately following the newline.
** If DELTASRC exists, then the CONTENT is a delta against the
** content of DELTASRC.
**
** If any error occurs, write a message into pErr which has already
** be initialized to an empty string.
*/
static void xfer_accept_file(Xfer *pXfer){
int n;
int rid;
Blob content, hash;
if( pXfer->nToken<3
|| pXfer->nToken>4
|| !blob_is_uuid(&pXfer->aToken[1])
|| !blob_is_int(&pXfer->aToken[pXfer->nToken-1], &n)
|| n<=0
|| (pXfer->nToken==4 && !blob_is_uuid(&pXfer->aToken[2]))
){
blob_appendf(&pXfer->err, "malformed file line");
return;
}
blob_zero(&content);
blob_zero(&hash);
blob_extract(pXfer->pIn, n, &content);
if( pXfer->nToken==4 ){
Blob src;
int srcid = rid_from_uuid(&pXfer->aToken[2], 1);
if( content_get(srcid, &src)==0 ){
content_put(&content, blob_str(&pXfer->aToken[1]), srcid);
blob_appendf(pXfer->pOut, "gimme %b\n", &pXfer->aToken[2]);
pXfer->nGimmeSent++;
pXfer->nDanglingFile++;
return;
}
pXfer->nDeltaRcvd++;
blob_delta_apply(&src, &content, &content);
blob_reset(&src);
}else{
pXfer->nFileRcvd++;
}
sha1sum_blob(&content, &hash);
if( !blob_eq_str(&pXfer->aToken[1], blob_str(&hash), -1) ){
blob_appendf(&pXfer->err, "content does not match sha1 hash");
}
blob_reset(&hash);
rid = content_put(&content, 0, 0);
if( rid==0 ){
blob_appendf(&pXfer->err, "%s", g.zErrMsg);
}else{
manifest_crosslink(rid, &content);
}
}
/*
** Try to send a file as a delta. If successful, return the number
** of bytes in the delta. If not, return zero.
**
** If srcId is specified, use it. If not, try to figure out a
** reasonable srcId.
*/
static int send_as_delta(
Xfer *pXfer, /* The transfer context */
int rid, /* record id of the file to send */
Blob *pContent, /* The content of the file to send */
Blob *pUuid, /* The UUID of the file to send */
int srcId /* Send as a delta against this record */
){
static const char *azQuery[] = {
"SELECT pid FROM plink"
" WHERE cid=%d"
" AND NOT EXISTS(SELECT 1 FROM phantom WHERE rid=pid)",
"SELECT pid FROM mlink"
" WHERE fid=%d"
" AND NOT EXISTS(SELECT 1 FROM phantom WHERE rid=pid)",
};
int i;
Blob src, delta;
int size = 0;
for(i=0; srcId==0 && i<count(azQuery); i++){
srcId = db_int(0, azQuery[i], rid);
}
if( srcId>0 && content_get(srcId, &src) ){
char *zUuid = db_text(0, "SELECT uuid FROM blob WHERE rid=%d", srcId);
blob_delta_create(&src, pContent, &delta);
size = blob_size(&delta);
if( size>=blob_size(pContent)-50 ){
size = 0;
}else{
blob_appendf(pXfer->pOut, "file %b %s %d\n", pUuid, zUuid, size);
blob_append(pXfer->pOut, blob_buffer(&delta), size);
/* blob_appendf(pXfer->pOut, "\n", 1); */
}
blob_reset(&delta);
free(zUuid);
blob_reset(&src);
}
return size;
}
/*
** Send the file identified by rid.
**
** The pUuid can be NULL in which case the correct UUID is computed
** from the rid.
**
** If srcId is positive, then a delta is sent against that srcId.
** If srcId is zero, then an attempt is made to find an appropriate
** file to delta against. If srcId is negative, the file is sent
** without deltaing.
*/
static void send_file(Xfer *pXfer, int rid, Blob *pUuid, int srcId){
Blob content, uuid;
int size = 0;
if( db_exists("SELECT 1 FROM onremote WHERE rid=%d", rid) ){
return;
}
blob_zero(&uuid);
if( pUuid==0 ){
db_blob(&uuid, "SELECT uuid FROM blob WHERE rid=%d AND size>=0", rid);
if( blob_size(&uuid)==0 ){
return;
}
pUuid = &uuid;
}
if( pXfer->mxSend<=blob_size(pXfer->pOut) ){
blob_appendf(pXfer->pOut, "igot %b\n", pUuid);
pXfer->nIGotSent++;
blob_reset(&uuid);
return;
}
content_get(rid, &content);
if( blob_size(&content)>100 ){
size = send_as_delta(pXfer, rid, &content, pUuid, srcId);
}
if( size==0 ){
int size = blob_size(&content);
blob_appendf(pXfer->pOut, "file %b %d\n", pUuid, size);
blob_append(pXfer->pOut, blob_buffer(&content), size);
pXfer->nFileSent++;
}else{
pXfer->nDeltaSent++;
}
db_multi_exec("INSERT INTO onremote VALUES(%d)", rid);
blob_reset(&uuid);
}
/*
** This routine runs when either client or server is notified that
** the other side things rid is a leaf manifest. If we hold
** children of rid, then send them over to the other side.
*/
static void leaf_response(Xfer *pXfer, int rid){
Stmt q1, q2;
db_prepare(&q1,
"SELECT cid, uuid FROM plink, blob"
" WHERE blob.rid=plink.cid"
" AND plink.pid=%d",
rid
);
while( db_step(&q1)==SQLITE_ROW ){
Blob uuid;
int cid;
cid = db_column_int(&q1, 0);
db_ephemeral_blob(&q1, 1, &uuid);
send_file(pXfer, cid, &uuid, rid);
db_prepare(&q2,
"SELECT pid, uuid, fid FROM mlink, blob"
" WHERE rid=fid AND mid=%d",
cid
);
while( db_step(&q2)==SQLITE_ROW ){
int pid, fid;
pid = db_column_int(&q2, 0);
db_ephemeral_blob(&q2, 1, &uuid);
fid = db_column_int(&q2, 2);
send_file(pXfer, fid, &uuid, pid);
}
db_finalize(&q2);
if( blob_size(pXfer->pOut)<pXfer->mxSend ){
leaf_response(pXfer, cid);
}
}
}
/*
** Sent a leaf message for every leaf.
*/
static void send_leaves(Xfer *pXfer){
Stmt q;
db_prepare(&q,
"SELECT uuid FROM blob WHERE rid IN"
" (SELECT cid FROM plink EXCEPT SELECT pid FROM plink)"
);
while( db_step(&q)==SQLITE_ROW ){
const char *zUuid = db_column_text(&q, 0);
blob_appendf(pXfer->pOut, "leaf %s\n", zUuid);
}
db_finalize(&q);
}
/*
** Sen a gimme message for every phantom.
*/
static void request_phantoms(Xfer *pXfer){
Stmt q;
db_prepare(&q, "SELECT uuid FROM phantom JOIN blob USING(rid)");
while( db_step(&q)==SQLITE_ROW ){
const char *zUuid = db_column_text(&q, 0);
blob_appendf(pXfer->pOut, "gimme %s\n", zUuid);
pXfer->nGimmeSent++;
}
db_finalize(&q);
}
/*
** Check the signature on an application/x-fossil payload received by
** the HTTP server. The signature is a line of the following form:
**
** login LOGIN NONCE SIGNATURE
**
** The NONCE is a random string. The server will never accept a
** repeat NONCE. SIGNATURE is the SHA1 checksum of the NONCE
** concatenated with the users password.
**
** The parameters to this routine are ephermeral blobs holding the
** LOGIN, NONCE and SIGNATURE.
**
** This routine attempts to locate the user and verify the signature.
** If everything checks out, the USER.CAP column for the USER table
** is consulted to set privileges in the global g variable.
**
** If anything fails to check out, no changes are made to privileges.
**
** Signature generation on the client side is handled by the
** http_exchange() routine.
*/
void check_login(Blob *pLogin, Blob *pNonce, Blob *pSig){
Stmt q;
int rc;
if( db_exists("SELECT 1 FROM rcvfrom WHERE nonce=%B", pNonce) ){
return; /* Never accept a repeated nonce */
}
db_prepare(&q, "SELECT pw, cap, uid FROM user WHERE login=%B", pLogin);
if( db_step(&q)==SQLITE_ROW ){
Blob pw, combined, hash;
blob_zero(&pw);
db_ephemeral_blob(&q, 0, &pw);
blob_zero(&combined);
blob_copy(&combined, pNonce);
blob_append(&combined, blob_buffer(&pw), blob_size(&pw));
/* CGIDEBUG(("presig=[%s]\n", blob_str(&combined))); */
sha1sum_blob(&combined, &hash);
rc = blob_compare(&hash, pSig);
blob_reset(&hash);
blob_reset(&combined);
if( rc==0 ){
const char *zCap;
zCap = db_column_text(&q, 1);
login_set_capabilities(zCap);
g.userUid = db_column_int(&q, 2);
g.zLogin = mprintf("%b", pLogin);
g.zNonce = mprintf("%b", pNonce);
}
}
db_reset(&q);
}
/*
** If this variable is set, disable login checks. Used for debugging
** only.
*/
static int disableLogin = 0;
/*
** WEBPAGE: xfer
**
** This is the transfer handler on the server side. The transfer
** message has been uncompressed and placed in the g.cgiIn blob.
** Process this message and form an appropriate reply.
*/
void page_xfer(void){
int isPull = 0;
int isPush = 0;
int nErr = 0;
Xfer xfer;
memset(&xfer, 0, sizeof(xfer));
blobarray_zero(xfer.aToken, count(xfer.aToken));
cgi_set_content_type(g.zContentType);
blob_zero(&xfer.err);
xfer.pIn = &g.cgiIn;
xfer.pOut = cgi_output_blob();
xfer.mxSend = db_get_int("max-download", 1000000);
db_begin_transaction();
db_multi_exec(
"CREATE TEMP TABLE onremote(rid INTEGER PRIMARY KEY);"
);
while( blob_line(xfer.pIn, &xfer.line) ){
xfer.nToken = blob_tokenize(&xfer.line, xfer.aToken, count(xfer.aToken));
/* file UUID SIZE \n CONTENT
** file UUID DELTASRC SIZE \n CONTENT
**
** Accept a file from the client.
*/
if( blob_eq(&xfer.aToken[0], "file") ){
if( !isPush ){
cgi_reset_content();
@ error not\sauthorized\sto\swrite
nErr++;
break;
}
xfer_accept_file(&xfer);
if( blob_size(&xfer.err) ){
cgi_reset_content();
@ error %T(blob_str(&xfer.err))
nErr++;
break;
}
}else
/* gimme UUID
**
** Client is requesting a file
*/
if( blob_eq(&xfer.aToken[0], "gimme")
&& xfer.nToken==2
&& blob_is_uuid(&xfer.aToken[1])
){
if( isPull ){
int rid = rid_from_uuid(&xfer.aToken[1], 0);
if( rid ){
send_file(&xfer, rid, &xfer.aToken[1], 0);
}
}
}else
/* igot UUID
**
** Client announces that it has a particular file
*/
if( xfer.nToken==2
&& blob_eq(&xfer.aToken[0], "igot")
&& blob_is_uuid(&xfer.aToken[1])
){
if( isPush ){
rid_from_uuid(&xfer.aToken[1], 1);
}
}else
/* leaf UUID
**
** Client announces that it has a particular manifest. If
** the server has children of this leaf, then send those
** children back to the client. If the server lacks this
** leaf, request it.
*/
if( xfer.nToken==2
&& blob_eq(&xfer.aToken[0], "leaf")
&& blob_is_uuid(&xfer.aToken[1])
){
int rid = rid_from_uuid(&xfer.aToken[1], 0);
if( isPull && rid ){
leaf_response(&xfer, rid);
}
if( isPush && !rid ){
content_put(0, blob_str(&xfer.aToken[1]), 0);
}
}else
/* pull SERVERCODE PROJECTCODE
** push SERVERCODE PROJECTCODE
**
** The client wants either send or receive
*/
if( xfer.nToken==3
&& (blob_eq(&xfer.aToken[0], "pull") || blob_eq(&xfer.aToken[0], "push"))
&& blob_is_uuid(&xfer.aToken[1])
&& blob_is_uuid(&xfer.aToken[2])
){
const char *zSCode;
const char *zPCode;
zSCode = db_get("server-code", 0);
if( zSCode==0 ){
fossil_panic("missing server code");
}
if( blob_eq_str(&xfer.aToken[1], zSCode, -1) ){
cgi_reset_content();
@ error server\sloop
nErr++;
break;
}
zPCode = db_get("project-code", 0);
if( zPCode==0 ){
fossil_panic("missing project code");
}
if( !blob_eq_str(&xfer.aToken[2], zPCode, -1) ){
cgi_reset_content();
@ error wrong\sproject
nErr++;
break;
}
login_check_credentials();
if( blob_eq(&xfer.aToken[0], "pull") ){
if( !g.okRead ){
cgi_reset_content();
@ error not\sauthorized\sto\sread
nErr++;
break;
}
isPull = 1;
}else{
if( !g.okWrite ){
cgi_reset_content();
@ error not\sauthorized\sto\swrite
nErr++;
break;
}
send_leaves(&xfer);
isPush = 1;
}
}else
/* clone
**
** The client knows nothing. Tell all.
*/
if( blob_eq(&xfer.aToken[0], "clone") ){
int rootid;
login_check_credentials();
if( !g.okRead || !g.okHistory ){
cgi_reset_content();
@ error not\sauthorized\sto\sclone
nErr++;
break;
}
isPull = 1;
@ push %s(db_get("server-code", "x")) %s(db_get("project-code", "x"))
rootid = db_int(0,
"SELECT pid FROM plink AS a"
" WHERE NOT EXISTS(SELECT 1 FROM plink WHERE cid=a.pid)"
);
if( rootid ){
send_file(&xfer, rootid, 0, -1);
leaf_response(&xfer, rootid);
}
}else
/* login USER NONCE SIGNATURE
**
** Check for a valid login. This has to happen before anything else.
*/
if( blob_eq(&xfer.aToken[0], "login")
&& xfer.nToken==4
){
if( disableLogin ){
g.okRead = g.okWrite = 1;
}else{
check_login(&xfer.aToken[1], &xfer.aToken[2], &xfer.aToken[3]);
}
}else
/* Unknown message
*/
{
cgi_reset_content();
@ error bad\scommand:\s%F(blob_str(&xfer.line))
}
blobarray_reset(xfer.aToken, xfer.nToken);
}
if( isPush ){
request_phantoms(&xfer);
}
db_end_transaction(0);
}
/*
** COMMAND: test-xfer
**
** This command is used for debugging the server. There is a single
** argument which is the uncompressed content of an "xfer" message
** from client to server. This command interprets that message as
** if had been received by the server.
**
** On the client side, run:
**
** fossil push http://bogus/ --httptrace
**
** Or a similar command to provide the output. The content of the
** message will appear on standard output. Capture this message
** into a file named (for example) out.txt. Then run the
** server in gdb:
**
** gdb fossil
** r test-xfer out.txt
*/
void cmd_test_xfer(void){
int notUsed;
if( g.argc!=2 && g.argc!=3 ){
usage("?MESSAGEFILE?");
}
db_must_be_within_tree();
blob_zero(&g.cgiIn);
blob_read_from_file(&g.cgiIn, g.argc==2 ? "-" : g.argv[2]);
disableLogin = 1;
page_xfer();
printf("%s\n", cgi_extract_content(¬Used));
}
/*
** Sync to the host identified in g.urlName and g.urlPath. This
** routine is called by the client.
**
** Records are pushed to the server if pushFlag is true. Records
** are pulled if pullFlag is true. A full sync occurs if both are
** true.
*/
void client_sync(int pushFlag, int pullFlag, int cloneFlag){
int go = 1; /* Loop until zero */
const char *zSCode = db_get("server-code", "x");
const char *zPCode = db_get("project-code", 0);
int nMsg = 0; /* Number of messages sent or received */
int nCycle = 0; /* Number of round trips to the server */
int nFileSend = 0;
Blob send; /* Text we are sending to the server */
Blob recv; /* Reply we got back from the server */
Xfer xfer; /* Transfer data */
memset(&xfer, 0, sizeof(xfer));
xfer.pIn = &recv;
xfer.pOut = &send;
xfer.mxSend = db_get_int("max-upload", 250000);
assert( pushFlag || pullFlag || cloneFlag );
assert( !g.urlIsFile ); /* This only works for networking */
db_begin_transaction();
db_multi_exec(
"CREATE TEMP TABLE onremote(rid INTEGER PRIMARY KEY);"
);
blobarray_zero(xfer.aToken, count(xfer.aToken));
blob_zero(&send);
blob_zero(&recv);
blob_zero(&xfer.err);
blob_zero(&xfer.line);
/*
** Always begin with a clone, pull, or push message
*/
if( cloneFlag ){
blob_appendf(&send, "clone\n");
pushFlag = 0;
pullFlag = 0;
nMsg++;
}else if( pullFlag ){
blob_appendf(&send, "pull %s %s\n", zSCode, zPCode);
nMsg++;
}
if( pushFlag ){
blob_appendf(&send, "push %s %s\n", zSCode, zPCode);
nMsg++;
}
while( go ){
int newPhantom = 0;
/* Generate gimme messages for phantoms and leaf messages
** for all leaves.
*/
if( pullFlag ){
request_phantoms(&xfer);
send_leaves(&xfer);
}
/* Exchange messages with the server */
nFileSend = xfer.nFileSent + xfer.nDeltaSent;
printf("Send: %10d bytes, %3d messages, %3d files (%d+%d)\n",
blob_size(&send), nMsg+xfer.nGimmeSent+xfer.nIGotSent,
nFileSend, xfer.nFileSent, xfer.nDeltaSent);
nMsg = 0;
xfer.nFileSent = 0;
xfer.nDeltaSent = 0;
xfer.nGimmeSent = 0;
http_exchange(&send, &recv);
blob_reset(&send);
/* Begin constructing the next message (which might never be
** sent) by beginning with the pull or push messages
*/
if( pullFlag ){
blob_appendf(&send, "pull %s %s\n", zSCode, zPCode);
nMsg++;
}
if( pushFlag ){
blob_appendf(&send, "push %s %s\n", zSCode, zPCode);
nMsg++;
}
/* Process the reply that came back from the server */
while( blob_line(&recv, &xfer.line) ){
if( blob_buffer(&xfer.line)[0]=='#' ){
continue;
}
xfer.nToken = blob_tokenize(&xfer.line, xfer.aToken, count(xfer.aToken));
/* file UUID SIZE \n CONTENT
** file UUID DELTASRC SIZE \n CONTENT
**
** Receive a file transmitted from the other side
*/
if( blob_eq(&xfer.aToken[0],"file") ){
xfer_accept_file(&xfer);
}else
/* gimme UUID
**
** Server is requesting a file
*/
if( blob_eq(&xfer.aToken[0], "gimme")
&& xfer.nToken==2
&& blob_is_uuid(&xfer.aToken[1])
){
nMsg++;
if( pushFlag ){
int rid = rid_from_uuid(&xfer.aToken[1], 0);
send_file(&xfer, rid, &xfer.aToken[1], 0);
}
}else
/* igot UUID
**
** Server announces that it has a particular file
*/
if( xfer.nToken==2
&& blob_eq(&xfer.aToken[0], "igot")
&& blob_is_uuid(&xfer.aToken[1])
){
nMsg++;
if( pullFlag ){
if( !db_exists("SELECT 1 FROM blob WHERE uuid='%b' AND size>=0",
&xfer.aToken[1]) ){
content_put(0, blob_str(&xfer.aToken[1]), 0);
newPhantom = 1;
}
}
}else
/* leaf UUID
**
** Server announces that it has a particular manifest
*/
if( xfer.nToken==2
&& blob_eq(&xfer.aToken[0], "leaf")
&& blob_is_uuid(&xfer.aToken[1])
){
int rid = rid_from_uuid(&xfer.aToken[1], 0);
nMsg++;
if( pushFlag && rid ){
leaf_response(&xfer, rid);
}
if( pullFlag && rid==0 ){
content_put(0, blob_str(&xfer.aToken[1]), 0);
newPhantom = 1;
}
}else
/* push SERVERCODE PRODUCTCODE
**
** Should only happen in response to a clone.
*/
if( blob_eq(&xfer.aToken[0],"push")
&& xfer.nToken==3
&& cloneFlag
&& blob_is_uuid(&xfer.aToken[1])
&& blob_is_uuid(&xfer.aToken[2])
){
if( blob_eq_str(&xfer.aToken[1], zSCode, -1) ){
fossil_fatal("server loop");
}
nMsg++;
if( zPCode==0 ){
zPCode = mprintf("%b", &xfer.aToken[2]);
db_set("project-code", zPCode);
}
cloneFlag = 0;
pullFlag = 1;
blob_appendf(&send, "pull %s %s\n", zSCode, zPCode);
nMsg++;
}else
/* error MESSAGE
**
** Report an error
*/
if( blob_eq(&xfer.aToken[0],"error") && xfer.nToken==2 ){
char *zMsg = blob_terminate(&xfer.aToken[1]);
defossilize(zMsg);
blob_appendf(&xfer.err, "server says: %s", zMsg);
}else
/* Unknown message */
{
blob_appendf(&xfer.err, "unknown command: %b", &xfer.aToken[0]);
}
if( blob_size(&xfer.err) ){
fossil_fatal("%b", &xfer.err);
}
blobarray_reset(xfer.aToken, xfer.nToken);
blob_reset(&xfer.line);
}
printf("Received: %10d bytes, %3d messages, %3d files (%d+%d+%d)\n",
blob_size(&recv), nMsg,
xfer.nFileRcvd + xfer.nDeltaRcvd + xfer.nDanglingFile,
xfer.nFileRcvd, xfer.nDeltaRcvd, xfer.nDanglingFile);
blob_reset(&recv);
nMsg = 0;
xfer.nFileRcvd = 0;
xfer.nDeltaRcvd = 0;
xfer.nDanglingFile = 0;
nCycle++;
go = 0;
/* If we have received one or more files on this cycle or if
** we have received information that has caused us to create
** new phantoms and we have one or more phantoms, then go for
** another round
*/
if( (xfer.nFileRcvd+xfer.nDeltaRcvd+xfer.nDanglingFile>0 || newPhantom)
&& db_exists("SELECT 1 FROM phantom")
){
go = 1;
}
/* If we have one or more files queued to send, then go
** another round
*/
if( xfer.nFileSent+xfer.nDeltaSent>0 ){
go = 1;
}
};
http_close();
db_end_transaction(0);
}