/*
** Copyright (c) 2009 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 module implements the transport layer for the client side HTTP
** connection. The purpose of this layer is to provide a common interface
** for both HTTP and HTTPS and to provide a common "fetch one line"
** interface that is used for parsing the reply.
*/
#include "config.h"
#include "http_transport.h"
/*
** State information
*/
static struct {
int isOpen; /* True when the transport layer is open */
char *pBuf; /* Buffer used to hold the reply */
int nAlloc; /* Space allocated for transportBuf[] */
int nUsed ; /* Space of transportBuf[] used */
int iCursor; /* Next unread by in transportBuf[] */
int nSent; /* Number of bytes sent */
int nRcvd; /* Number of bytes received */
FILE *pFile; /* File I/O for FILE: */
char *zOutFile; /* Name of outbound file for FILE: */
char *zInFile; /* Name of inbound file for FILE: */
} transport = {
0, 0, 0, 0, 0, 0, 0
};
/*
** Return the current transport error message.
*/
const char *transport_errmsg(void){
#ifdef FOSSIL_ENABLE_SSL
if( g.urlIsHttps ){
return ssl_errmsg();
}
#endif
return socket_errmsg();
}
/*
** Retrieve send/receive counts from the transport layer. If "resetFlag"
** is true, then reset the counts.
*/
void transport_stats(int *pnSent, int *pnRcvd, int resetFlag){
if( pnSent ) *pnSent = transport.nSent;
if( pnRcvd ) *pnRcvd = transport.nRcvd;
if( resetFlag ){
transport.nSent = 0;
transport.nRcvd = 0;
}
}
/*
** Open a connection to the server. The server is defined by the following
** global variables:
**
** g.urlName Name of the server. Ex: www.fossil-scm.org
** g.urlPort TCP/IP port. Ex: 80
** g.urlIsHttps Use TLS for the connection
**
** Return the number of errors.
*/
int transport_open(void){
int rc = 0;
if( transport.isOpen==0 ){
if( g.urlIsHttps ){
#ifdef FOSSIL_ENABLE_SSL
rc = ssl_open();
if( rc==0 ) transport.isOpen = 1;
#else
socket_set_errmsg("HTTPS: Fossil has been compiled without SSL support");
rc = 1;
#endif
}else if( g.urlIsFile ){
sqlite3_uint64 iRandId;
sqlite3_randomness(sizeof(iRandId), &iRandId);
transport.zOutFile = mprintf("%s-%llu-out.http",
g.zRepositoryName, iRandId);
transport.zInFile = mprintf("%s-%llu-in.http",
g.zRepositoryName, iRandId);
transport.pFile = fopen(transport.zOutFile, "wb");
if( transport.pFile==0 ){
fossil_fatal("cannot output temporary file: %s", transport.zOutFile);
}
transport.isOpen = 1;
}else{
rc = socket_open();
if( rc==0 ) transport.isOpen = 1;
}
}
return rc;
}
/*
** Close the current connection
*/
void transport_close(void){
if( transport.isOpen ){
free(transport.pBuf);
transport.pBuf = 0;
transport.nAlloc = 0;
transport.nUsed = 0;
transport.iCursor = 0;
if( g.urlIsHttps ){
#ifdef FOSSIL_ENABLE_SSL
ssl_close();
#endif
}else if( g.urlIsFile ){
if( transport.pFile ){
fclose(transport.pFile);
transport.pFile = 0;
}
unlink(transport.zInFile);
unlink(transport.zOutFile);
free(transport.zInFile);
free(transport.zOutFile);
}else{
socket_close();
}
transport.isOpen = 0;
}
}
/*
** Send content over the wire.
*/
void transport_send(Blob *toSend){
char *z = blob_buffer(toSend);
int n = blob_size(toSend);
transport.nSent += n;
if( g.urlIsHttps ){
#ifdef FOSSIL_ENABLE_SSL
int sent;
while( n>0 ){
sent = ssl_send(0, z, n);
/* printf("Sent %d of %d bytes\n", sent, n); fflush(stdout); */
if( sent<=0 ) break;
n -= sent;
}
#endif
}else if( g.urlIsFile ){
fwrite(z, 1, n, transport.pFile);
}else{
int sent;
while( n>0 ){
sent = socket_send(0, z, n);
/* printf("Sent %d of %d bytes\n", sent, n); fflush(stdout); */
if( sent<=0 ) break;
n -= sent;
}
}
}
/*
** This routine is called when the outbound message is complete and
** it is time to being recieving a reply.
*/
void transport_flip(void){
if( g.urlIsFile ){
char *zCmd;
fclose(transport.pFile);
zCmd = mprintf("\"%s\" http \"%s\" \"%s\" \"%s\" 127.0.0.1",
g.argv[0], g.urlName, transport.zOutFile, transport.zInFile
);
portable_system(zCmd);
free(zCmd);
transport.pFile = fopen(transport.zInFile, "rb");
}
}
/*
** This routine is called when the inbound message has been received
** and it is time to start sending again.
*/
void transport_rewind(void){
if( g.urlIsFile ){
transport_close();
}
}
/*
** Read N bytes of content from the wire and store in the supplied buffer.
** Return the number of bytes actually received.
*/
int transport_receive(char *zBuf, int N){
int onHand; /* Bytes current held in the transport buffer */
int nByte = 0; /* Bytes of content received */
onHand = transport.nUsed - transport.iCursor;
if( onHand>0 ){
int toMove = onHand;
if( toMove>N ) toMove = N;
/* printf("bytes on hand: %d of %d\n", toMove, N); fflush(stdout); */
memcpy(zBuf, &transport.pBuf[transport.iCursor], toMove);
transport.iCursor += toMove;
if( transport.iCursor>=transport.nUsed ){
transport.nUsed = 0;
transport.iCursor = 0;
}
N -= toMove;
zBuf += toMove;
nByte += toMove;
}
if( N>0 ){
int got;
if( g.urlIsHttps ){
#ifdef FOSSIL_ENABLE_SSL
got = ssl_receive(0, zBuf, N);
/* printf("received %d of %d bytes\n", got, N); fflush(stdout); */
#else
got = 0;
#endif
}else if( g.urlIsFile ){
got = fread(zBuf, 1, N, transport.pFile);
}else{
got = socket_receive(0, zBuf, N);
/* printf("received %d of %d bytes\n", got, N); fflush(stdout); */
}
if( got>0 ){
nByte += got;
transport.nRcvd += got;
}
}
return nByte;
}
/*
** Load up to N new bytes of content into the transport.pBuf buffer.
** The buffer itself might be moved. And the transport.iCursor value
** might be reset to 0.
*/
static void transport_load_buffer(int N){
int i, j;
if( transport.nAlloc==0 ){
transport.nAlloc = N;
transport.pBuf = malloc( N );
if( transport.pBuf==0 ) fossil_panic("out of memory");
transport.iCursor = 0;
transport.nUsed = 0;
}
if( transport.iCursor>0 ){
for(i=0, j=transport.iCursor; j<transport.nUsed; i++, j++){
transport.pBuf[i] = transport.pBuf[j];
}
transport.nUsed -= transport.iCursor;
transport.iCursor = 0;
}
if( transport.nUsed + N > transport.nAlloc ){
char *pNew;
transport.nAlloc = transport.nUsed + N;
pNew = realloc(transport.pBuf, transport.nAlloc);
if( pNew==0 ) fossil_panic("out of memory");
transport.pBuf = pNew;
}
if( N>0 ){
i = transport_receive(&transport.pBuf[transport.nUsed], N);
if( i>0 ){
transport.nUsed += i;
}
}
}
/*
** Fetch a single line of input where a line is all text up to the next
** \n character or until the end of input. Remove all trailing whitespace
** from the received line and zero-terminate the result. Return a pointer
** to the line.
**
** Each call to this routine potentially overwrites the returned buffer.
*/
char *transport_receive_line(void){
int i;
int iStart;
i = iStart = transport.iCursor;
while(1){
if( i >= transport.nUsed ){
transport_load_buffer(1000);
i -= iStart;
iStart = 0;
if( i >= transport.nUsed ){
transport.pBuf[i] = 0;
transport.iCursor = i;
break;
}
}
if( transport.pBuf[i]=='\n' ){
transport.iCursor = i+1;
while( i>=iStart && isspace(transport.pBuf[i]) ){
transport.pBuf[i] = 0;
i--;
}
break;
}
i++;
}
/* printf("Got line: [%s]\n", &transport.pBuf[iStart]); */
return &transport.pBuf[iStart];
}
void *transport_global_shutdown(void){
if( g.urlIsHttps ){
#ifdef FOSSIL_ENABLE_SSL
ssl_global_shutdown();
#endif
}else{
socket_global_shutdown();
}
}