440 lines
13 KiB
C
440 lines
13 KiB
C
/***************************************************************************
|
|
* _ _ ____ _
|
|
* Project ___| | | | _ \| |
|
|
* / __| | | | |_) | |
|
|
* | (__| |_| | _ <| |___
|
|
* \___|\___/|_| \_\_____|
|
|
*
|
|
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
|
|
*
|
|
* This software is licensed as described in the file COPYING, which
|
|
* you should have received as part of this distribution. The terms
|
|
* are also available at https://curl.se/docs/copyright.html.
|
|
*
|
|
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
|
|
* copies of the Software, and permit persons to whom the Software is
|
|
* furnished to do so, under the terms of the COPYING file.
|
|
*
|
|
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
* KIND, either express or implied.
|
|
*
|
|
* SPDX-License-Identifier: curl
|
|
*
|
|
***************************************************************************/
|
|
|
|
#include "curl_setup.h"
|
|
|
|
#ifdef HAVE_NETINET_IN_H
|
|
#include <netinet/in.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_LINUX_TCP_H
|
|
#include <linux/tcp.h>
|
|
#elif defined(HAVE_NETINET_TCP_H)
|
|
#include <netinet/tcp.h>
|
|
#endif
|
|
|
|
#include <curl/curl.h>
|
|
|
|
#include "urldata.h"
|
|
#include "sendf.h"
|
|
#include "cfilters.h"
|
|
#include "connect.h"
|
|
#include "vtls/vtls.h"
|
|
#include "vssh/ssh.h"
|
|
#include "easyif.h"
|
|
#include "multiif.h"
|
|
#include "strerror.h"
|
|
#include "select.h"
|
|
#include "strdup.h"
|
|
#include "http2.h"
|
|
#include "headers.h"
|
|
#include "ws.h"
|
|
|
|
/* The last 3 #include files should be in this order */
|
|
#include "curl_printf.h"
|
|
#include "curl_memory.h"
|
|
#include "memdebug.h"
|
|
|
|
#if defined(CURL_DO_LINEEND_CONV) && !defined(CURL_DISABLE_FTP)
|
|
/*
|
|
* convert_lineends() changes CRLF (\r\n) end-of-line markers to a single LF
|
|
* (\n), with special processing for CRLF sequences that are split between two
|
|
* blocks of data. Remaining, bare CRs are changed to LFs. The possibly new
|
|
* size of the data is returned.
|
|
*/
|
|
static size_t convert_lineends(struct Curl_easy *data,
|
|
char *startPtr, size_t size)
|
|
{
|
|
char *inPtr, *outPtr;
|
|
|
|
/* sanity check */
|
|
if(!startPtr || (size < 1)) {
|
|
return size;
|
|
}
|
|
|
|
if(data->state.prev_block_had_trailing_cr) {
|
|
/* The previous block of incoming data
|
|
had a trailing CR, which was turned into a LF. */
|
|
if(*startPtr == '\n') {
|
|
/* This block of incoming data starts with the
|
|
previous block's LF so get rid of it */
|
|
memmove(startPtr, startPtr + 1, size-1);
|
|
size--;
|
|
/* and it wasn't a bare CR but a CRLF conversion instead */
|
|
data->state.crlf_conversions++;
|
|
}
|
|
data->state.prev_block_had_trailing_cr = FALSE; /* reset the flag */
|
|
}
|
|
|
|
/* find 1st CR, if any */
|
|
inPtr = outPtr = memchr(startPtr, '\r', size);
|
|
if(inPtr) {
|
|
/* at least one CR, now look for CRLF */
|
|
while(inPtr < (startPtr + size-1)) {
|
|
/* note that it's size-1, so we'll never look past the last byte */
|
|
if(memcmp(inPtr, "\r\n", 2) == 0) {
|
|
/* CRLF found, bump past the CR and copy the NL */
|
|
inPtr++;
|
|
*outPtr = *inPtr;
|
|
/* keep track of how many CRLFs we converted */
|
|
data->state.crlf_conversions++;
|
|
}
|
|
else {
|
|
if(*inPtr == '\r') {
|
|
/* lone CR, move LF instead */
|
|
*outPtr = '\n';
|
|
}
|
|
else {
|
|
/* not a CRLF nor a CR, just copy whatever it is */
|
|
*outPtr = *inPtr;
|
|
}
|
|
}
|
|
outPtr++;
|
|
inPtr++;
|
|
} /* end of while loop */
|
|
|
|
if(inPtr < startPtr + size) {
|
|
/* handle last byte */
|
|
if(*inPtr == '\r') {
|
|
/* deal with a CR at the end of the buffer */
|
|
*outPtr = '\n'; /* copy a NL instead */
|
|
/* note that a CRLF might be split across two blocks */
|
|
data->state.prev_block_had_trailing_cr = TRUE;
|
|
}
|
|
else {
|
|
/* copy last byte */
|
|
*outPtr = *inPtr;
|
|
}
|
|
outPtr++;
|
|
}
|
|
if(outPtr < startPtr + size)
|
|
/* tidy up by null terminating the now shorter data */
|
|
*outPtr = '\0';
|
|
|
|
return (outPtr - startPtr);
|
|
}
|
|
return size;
|
|
}
|
|
#endif /* CURL_DO_LINEEND_CONV && !CURL_DISABLE_FTP */
|
|
|
|
/*
|
|
* Curl_nwrite() is an internal write function that sends data to the
|
|
* server. Works with a socket index for the connection.
|
|
*
|
|
* If the write would block (CURLE_AGAIN), it returns CURLE_OK and
|
|
* (*nwritten == 0). Otherwise we return regular CURLcode value.
|
|
*/
|
|
CURLcode Curl_nwrite(struct Curl_easy *data,
|
|
int sockindex,
|
|
const void *buf,
|
|
size_t blen,
|
|
ssize_t *pnwritten)
|
|
{
|
|
ssize_t nwritten;
|
|
CURLcode result = CURLE_OK;
|
|
struct connectdata *conn;
|
|
|
|
DEBUGASSERT(sockindex >= 0 && sockindex < 2);
|
|
DEBUGASSERT(pnwritten);
|
|
DEBUGASSERT(data);
|
|
DEBUGASSERT(data->conn);
|
|
conn = data->conn;
|
|
#ifdef CURLDEBUG
|
|
{
|
|
/* Allow debug builds to override this logic to force short sends
|
|
*/
|
|
char *p = getenv("CURL_SMALLSENDS");
|
|
if(p) {
|
|
size_t altsize = (size_t)strtoul(p, NULL, 10);
|
|
if(altsize)
|
|
blen = CURLMIN(blen, altsize);
|
|
}
|
|
}
|
|
#endif
|
|
nwritten = conn->send[sockindex](data, sockindex, buf, blen, &result);
|
|
if(result == CURLE_AGAIN) {
|
|
nwritten = 0;
|
|
result = CURLE_OK;
|
|
}
|
|
else if(result) {
|
|
nwritten = -1; /* make sure */
|
|
}
|
|
else {
|
|
DEBUGASSERT(nwritten >= 0);
|
|
}
|
|
|
|
*pnwritten = nwritten;
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Curl_write() is an internal write function that sends data to the
|
|
* server. Works with plain sockets, SCP, SSL or kerberos.
|
|
*
|
|
* If the write would block (CURLE_AGAIN), we return CURLE_OK and
|
|
* (*written == 0). Otherwise we return regular CURLcode value.
|
|
*/
|
|
CURLcode Curl_write(struct Curl_easy *data,
|
|
curl_socket_t sockfd,
|
|
const void *mem,
|
|
size_t len,
|
|
ssize_t *written)
|
|
{
|
|
struct connectdata *conn;
|
|
int num;
|
|
|
|
DEBUGASSERT(data);
|
|
DEBUGASSERT(data->conn);
|
|
conn = data->conn;
|
|
num = (sockfd != CURL_SOCKET_BAD && sockfd == conn->sock[SECONDARYSOCKET]);
|
|
return Curl_nwrite(data, num, mem, len, written);
|
|
}
|
|
|
|
static CURLcode pausewrite(struct Curl_easy *data,
|
|
int type, /* what type of data */
|
|
const char *ptr,
|
|
size_t len)
|
|
{
|
|
/* signalled to pause sending on this connection, but since we have data
|
|
we want to send we need to dup it to save a copy for when the sending
|
|
is again enabled */
|
|
struct SingleRequest *k = &data->req;
|
|
struct UrlState *s = &data->state;
|
|
unsigned int i;
|
|
bool newtype = TRUE;
|
|
|
|
Curl_conn_ev_data_pause(data, TRUE);
|
|
|
|
if(s->tempcount) {
|
|
for(i = 0; i< s->tempcount; i++) {
|
|
if(s->tempwrite[i].type == type) {
|
|
/* data for this type exists */
|
|
newtype = FALSE;
|
|
break;
|
|
}
|
|
}
|
|
DEBUGASSERT(i < 3);
|
|
if(i >= 3)
|
|
/* There are more types to store than what fits: very bad */
|
|
return CURLE_OUT_OF_MEMORY;
|
|
}
|
|
else
|
|
i = 0;
|
|
|
|
if(newtype) {
|
|
/* store this information in the state struct for later use */
|
|
Curl_dyn_init(&s->tempwrite[i].b, DYN_PAUSE_BUFFER);
|
|
s->tempwrite[i].type = type;
|
|
s->tempcount++;
|
|
}
|
|
|
|
if(Curl_dyn_addn(&s->tempwrite[i].b, (unsigned char *)ptr, len))
|
|
return CURLE_OUT_OF_MEMORY;
|
|
|
|
/* mark the connection as RECV paused */
|
|
k->keepon |= KEEP_RECV_PAUSE;
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
|
|
/* chop_write() writes chunks of data not larger than CURL_MAX_WRITE_SIZE via
|
|
* client write callback(s) and takes care of pause requests from the
|
|
* callbacks.
|
|
*/
|
|
static CURLcode chop_write(struct Curl_easy *data,
|
|
int type,
|
|
char *optr,
|
|
size_t olen)
|
|
{
|
|
struct connectdata *conn = data->conn;
|
|
curl_write_callback writeheader = NULL;
|
|
curl_write_callback writebody = NULL;
|
|
char *ptr = optr;
|
|
size_t len = olen;
|
|
void *writebody_ptr = data->set.out;
|
|
|
|
if(!len)
|
|
return CURLE_OK;
|
|
|
|
/* If reading is paused, append this data to the already held data for this
|
|
type. */
|
|
if(data->req.keepon & KEEP_RECV_PAUSE)
|
|
return pausewrite(data, type, ptr, len);
|
|
|
|
/* Determine the callback(s) to use. */
|
|
if(type & CLIENTWRITE_BODY) {
|
|
#ifdef USE_WEBSOCKETS
|
|
if(conn->handler->protocol & (CURLPROTO_WS|CURLPROTO_WSS)) {
|
|
writebody = Curl_ws_writecb;
|
|
writebody_ptr = data;
|
|
}
|
|
else
|
|
#endif
|
|
writebody = data->set.fwrite_func;
|
|
}
|
|
if((type & CLIENTWRITE_HEADER) &&
|
|
(data->set.fwrite_header || data->set.writeheader)) {
|
|
/*
|
|
* Write headers to the same callback or to the especially setup
|
|
* header callback function (added after version 7.7.1).
|
|
*/
|
|
writeheader =
|
|
data->set.fwrite_header? data->set.fwrite_header: data->set.fwrite_func;
|
|
}
|
|
|
|
/* Chop data, write chunks. */
|
|
while(len) {
|
|
size_t chunklen = len <= CURL_MAX_WRITE_SIZE? len: CURL_MAX_WRITE_SIZE;
|
|
|
|
if(writebody) {
|
|
size_t wrote;
|
|
Curl_set_in_callback(data, true);
|
|
wrote = writebody(ptr, 1, chunklen, writebody_ptr);
|
|
Curl_set_in_callback(data, false);
|
|
|
|
if(CURL_WRITEFUNC_PAUSE == wrote) {
|
|
if(conn->handler->flags & PROTOPT_NONETWORK) {
|
|
/* Protocols that work without network cannot be paused. This is
|
|
actually only FILE:// just now, and it can't pause since the
|
|
transfer isn't done using the "normal" procedure. */
|
|
failf(data, "Write callback asked for PAUSE when not supported");
|
|
return CURLE_WRITE_ERROR;
|
|
}
|
|
return pausewrite(data, type, ptr, len);
|
|
}
|
|
if(wrote != chunklen) {
|
|
failf(data, "Failure writing output to destination");
|
|
return CURLE_WRITE_ERROR;
|
|
}
|
|
}
|
|
|
|
ptr += chunklen;
|
|
len -= chunklen;
|
|
}
|
|
|
|
#ifndef CURL_DISABLE_HTTP
|
|
/* HTTP header, but not status-line */
|
|
if((conn->handler->protocol & PROTO_FAMILY_HTTP) &&
|
|
(type & CLIENTWRITE_HEADER) && !(type & CLIENTWRITE_STATUS) ) {
|
|
unsigned char htype = (unsigned char)
|
|
(type & CLIENTWRITE_CONNECT ? CURLH_CONNECT :
|
|
(type & CLIENTWRITE_1XX ? CURLH_1XX :
|
|
(type & CLIENTWRITE_TRAILER ? CURLH_TRAILER :
|
|
CURLH_HEADER)));
|
|
CURLcode result = Curl_headers_push(data, optr, htype);
|
|
if(result)
|
|
return result;
|
|
}
|
|
#endif
|
|
|
|
if(writeheader) {
|
|
size_t wrote;
|
|
|
|
Curl_set_in_callback(data, true);
|
|
wrote = writeheader(optr, 1, olen, data->set.writeheader);
|
|
Curl_set_in_callback(data, false);
|
|
|
|
if(CURL_WRITEFUNC_PAUSE == wrote)
|
|
/* here we pass in the HEADER bit only since if this was body as well
|
|
then it was passed already and clearly that didn't trigger the
|
|
pause, so this is saved for later with the HEADER bit only */
|
|
return pausewrite(data, CLIENTWRITE_HEADER |
|
|
(type & (CLIENTWRITE_STATUS|CLIENTWRITE_CONNECT|
|
|
CLIENTWRITE_1XX|CLIENTWRITE_TRAILER)),
|
|
optr, olen);
|
|
if(wrote != olen) {
|
|
failf(data, "Failed writing header");
|
|
return CURLE_WRITE_ERROR;
|
|
}
|
|
}
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
|
|
/* Curl_client_write() sends data to the write callback(s)
|
|
|
|
The bit pattern defines to what "streams" to write to. Body and/or header.
|
|
The defines are in sendf.h of course.
|
|
|
|
If CURL_DO_LINEEND_CONV is enabled, data is converted IN PLACE to the
|
|
local character encoding. This is a problem and should be changed in
|
|
the future to leave the original data alone.
|
|
*/
|
|
CURLcode Curl_client_write(struct Curl_easy *data,
|
|
int type,
|
|
char *ptr,
|
|
size_t len)
|
|
{
|
|
#if !defined(CURL_DISABLE_FTP) && defined(CURL_DO_LINEEND_CONV)
|
|
/* FTP data may need conversion. */
|
|
if((type & CLIENTWRITE_BODY) &&
|
|
(data->conn->handler->protocol & PROTO_FAMILY_FTP) &&
|
|
data->conn->proto.ftpc.transfertype == 'A') {
|
|
/* convert end-of-line markers */
|
|
len = convert_lineends(data, ptr, len);
|
|
}
|
|
#endif
|
|
return chop_write(data, type, ptr, len);
|
|
}
|
|
|
|
/*
|
|
* Internal read-from-socket function. This is meant to deal with plain
|
|
* sockets, SSL sockets and kerberos sockets.
|
|
*
|
|
* Returns a regular CURLcode value.
|
|
*/
|
|
CURLcode Curl_read(struct Curl_easy *data, /* transfer */
|
|
curl_socket_t sockfd, /* read from this socket */
|
|
char *buf, /* store read data here */
|
|
size_t sizerequested, /* max amount to read */
|
|
ssize_t *n) /* amount bytes read */
|
|
{
|
|
CURLcode result = CURLE_RECV_ERROR;
|
|
ssize_t nread = 0;
|
|
size_t bytesfromsocket = 0;
|
|
char *buffertofill = NULL;
|
|
struct connectdata *conn = data->conn;
|
|
|
|
/* Set 'num' to 0 or 1, depending on which socket that has been sent here.
|
|
If it is the second socket, we set num to 1. Otherwise to 0. This lets
|
|
us use the correct ssl handle. */
|
|
int num = (sockfd == conn->sock[SECONDARYSOCKET]);
|
|
|
|
*n = 0; /* reset amount to zero */
|
|
|
|
bytesfromsocket = CURLMIN(sizerequested, (size_t)data->set.buffer_size);
|
|
buffertofill = buf;
|
|
|
|
nread = conn->recv[num](data, num, buffertofill, bytesfromsocket, &result);
|
|
if(nread < 0)
|
|
goto out;
|
|
|
|
*n += nread;
|
|
result = CURLE_OK;
|
|
out:
|
|
return result;
|
|
}
|