/***************************************************************************

 *                                  _   _ ____  _

 *  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"

#include "urldata.h"

#include "cfilters.h"

#include "curlx/dynbuf.h"

#include "progress.h"

#include "request.h"

#include "sendf.h"

#include "curl_trc.h"

#include "transfer.h"

#include "url.h"

#include "curlx/strparse.h"

void Curl_req_init(struct SingleRequest *req)

{

  memset(req, 0, sizeof(*req));

}

CURLcode Curl_req_soft_reset(struct SingleRequest *req,

                             struct Curl_easy *data)

{

  CURLcode result;

  req->done = FALSE;

  req->upload_done = FALSE;

  req->upload_aborted = FALSE;

  req->download_done = FALSE;

  req->eos_written = FALSE;

  req->eos_read = FALSE;

  req->eos_sent = FALSE;

  req->ignorebody = FALSE;

  req->shutdown = FALSE;

  req->bytecount = 0;

  req->writebytecount = 0;

  req->header = FALSE;

  req->headerline = 0;

  req->headerbytecount = 0;

  req->allheadercount = 0;

  req->deductheadercount = 0;

  req->httpversion_sent = 0;

  req->httpversion = 0;

  req->sendbuf_hds_len = 0;

  curlx_safefree(req->hd_auth);

#ifndef CURL_DISABLE_PROXY

  curlx_safefree(req->hd_proxy_auth);

#endif

  result = Curl_client_start(data);

  if(result)

    return result;

  if(!req->sendbuf_init) {

    Curl_bufq_init2(&req->sendbuf, data->set.upload_buffer_size, 1,

                    BUFQ_OPT_SOFT_LIMIT);

    req->sendbuf_init = TRUE;

  }

  else {

    Curl_bufq_reset(&req->sendbuf);

    if(data->set.upload_buffer_size != req->sendbuf.chunk_size) {

      Curl_bufq_free(&req->sendbuf);

      Curl_bufq_init2(&req->sendbuf, data->set.upload_buffer_size, 1,

                      BUFQ_OPT_SOFT_LIMIT);

    }

  }

  return CURLE_OK;

}

CURLcode Curl_req_start(struct SingleRequest *req,

                        struct Curl_easy *data)

{

  req->start = *Curl_pgrs_now(data);

  return Curl_req_soft_reset(req, data);

}

static CURLcode req_flush(struct Curl_easy *data);

CURLcode Curl_req_done(struct SingleRequest *req,

                       struct Curl_easy *data, bool aborted)

{

  (void)req;

  if(!aborted)

    (void)req_flush(data);

  Curl_client_reset(data);

  return CURLE_OK;

}

void Curl_req_hard_reset(struct SingleRequest *req, struct Curl_easy *data)

{

  struct curltime t0 = { 0, 0 };

  curlx_safefree(req->newurl);

  curlx_safefree(req->hd_auth);

#ifndef CURL_DISABLE_PROXY

  curlx_safefree(req->hd_proxy_auth);

#endif

#ifndef CURL_DISABLE_COOKIES

  curlx_safefree(req->cookiehost);

#endif

  Curl_client_reset(data);

  if(req->sendbuf_init)

    Curl_bufq_reset(&req->sendbuf);

  /* clear any resolve data */

  Curl_resolv_destroy_all(data);

  /* Can no longer memset() this struct as we need to keep some state */

  req->size = -1;

  req->maxdownload = -1;

  req->bytecount = 0;

  req->writebytecount = 0;

  req->start = t0;

  req->headerbytecount = 0;

  req->allheadercount = 0;

  req->deductheadercount = 0;

  req->headerline = 0;

  req->offset = 0;

  req->httpcode = 0;

  req->io_flags = 0;

  req->upgr101 = UPGR101_NONE;

  req->sendbuf_hds_len = 0;

  req->timeofdoc = 0;

  req->location = NULL;

  req->newurl = NULL;

#ifndef CURL_DISABLE_COOKIES

  req->setcookies = 0;

#endif

  req->header = FALSE;

  req->content_range = FALSE;

  req->download_done = FALSE;

  req->eos_written = FALSE;

  req->eos_read = FALSE;

  req->eos_sent = FALSE;

  req->rewind_read = FALSE;

  req->upload_done = FALSE;

  req->upload_aborted = FALSE;

  req->ignorebody = FALSE;

  req->http_bodyless = FALSE;

  req->chunk = FALSE;

  req->resp_trailer = FALSE;

  req->ignore_cl = FALSE;

  req->upload_chunky = FALSE;

  req->no_body = data->set.opt_no_body;

  req->authneg = FALSE;

  req->shutdown = FALSE;

  /* Unpause all directions */

  Curl_rlimit_block(&data->progress.dl.rlimit, FALSE, &t0);

  Curl_rlimit_block(&data->progress.ul.rlimit, FALSE, &t0);

}

void Curl_req_free(struct SingleRequest *req, struct Curl_easy *data)

{

  curlx_safefree(req->newurl);

  curlx_safefree(req->hd_auth);

#ifndef CURL_DISABLE_PROXY

  curlx_safefree(req->hd_proxy_auth);

#endif

  if(req->sendbuf_init)

    Curl_bufq_free(&req->sendbuf);

  Curl_client_cleanup(data);

}

static CURLcode xfer_send(struct Curl_easy *data,

                          const char *buf, size_t blen,

                          size_t hds_len, size_t *pnwritten)

{

  CURLcode result = CURLE_OK;

  bool eos = FALSE;

  *pnwritten = 0;

  DEBUGASSERT(hds_len <= blen);

#ifdef DEBUGBUILD

  {

    /* Allow debug builds to override this logic to force short initial

       sends */

    size_t body_len = blen - hds_len;

    if(body_len) {

      const char *p = getenv("CURL_SMALLREQSEND");

      if(p) {

        curl_off_t body_small;

        if(!curlx_str_number(&p, &body_small, body_len))

          blen = hds_len + (size_t)body_small;

      }

    }

  }

#endif

  /* Make sure this does not send more body bytes than what the max send

     speed says. The headers do not count to the max speed. */

  if(data->set.max_send_speed) {

    size_t body_bytes = blen - hds_len;

    if((curl_off_t)body_bytes > data->set.max_send_speed)

      blen = hds_len + (size_t)data->set.max_send_speed;

  }

  if(data->req.eos_read &&

    (Curl_bufq_is_empty(&data->req.sendbuf) ||

     Curl_bufq_len(&data->req.sendbuf) == blen)) {

    DEBUGF(infof(data, "sending last upload chunk of %zu bytes", blen));

    eos = TRUE;

  }

  result = Curl_xfer_send(data, buf, blen, eos, pnwritten);

  if(!result) {

    if(eos && (blen == *pnwritten))

      data->req.eos_sent = TRUE;

    if(*pnwritten) {

      if(hds_len)

        Curl_debug(data, CURLINFO_HEADER_OUT, buf,

                   CURLMIN(hds_len, *pnwritten));

      if(*pnwritten > hds_len) {

        size_t body_len = *pnwritten - hds_len;

        Curl_debug(data, CURLINFO_DATA_OUT, buf + hds_len, body_len);

        data->req.writebytecount += body_len;

        Curl_pgrs_upload_inc(data, body_len);

      }

    }

  }

  return result;

}

static CURLcode req_send_buffer_flush(struct Curl_easy *data)

{

  CURLcode result = CURLE_OK;

  const unsigned char *buf;

  size_t blen;

  while(Curl_bufq_peek(&data->req.sendbuf, &buf, &blen)) {

    size_t nwritten, hds_len = CURLMIN(data->req.sendbuf_hds_len, blen);

    result = xfer_send(data, (const char *)buf, blen, hds_len, &nwritten);

    if(result)

      break;

    Curl_bufq_skip(&data->req.sendbuf, nwritten);

    if(hds_len) {

      data->req.sendbuf_hds_len -= CURLMIN(hds_len, nwritten);

    }

    /* leave if we could not send all. Maybe network blocking or

     * speed limits on transfer */

    if(nwritten < blen)

      break;

  }

  return result;

}

static CURLcode req_set_upload_done(struct Curl_easy *data)

{

  DEBUGASSERT(!data->req.upload_done);

  data->req.upload_done = TRUE;

  CURL_REQ_CLEAR_SEND(data);

  if(data->mstate >= MSTATE_DID)

    Curl_pgrsTime(data, TIMER_POSTRANSFER);

  Curl_creader_done(data, data->req.upload_aborted);

  if(data->req.upload_aborted) {

    Curl_bufq_reset(&data->req.sendbuf);

    if(data->req.writebytecount)

      infof(data, "abort upload after having sent %" FMT_OFF_T " bytes",

            data->req.writebytecount);

    else

      infof(data, "abort upload");

  }

  else if(data->req.writebytecount)

    infof(data, "upload completely sent off: %" FMT_OFF_T " bytes",

          data->req.writebytecount);

  else if(!data->req.download_done) {

    DEBUGASSERT(Curl_bufq_is_empty(&data->req.sendbuf));

    infof(data, Curl_creader_total_length(data) ?

          "We are completely uploaded and fine" :

          "Request completely sent off");

  }

  return Curl_xfer_send_close(data);

}

static CURLcode req_flush(struct Curl_easy *data)

{

  CURLcode result;

  if(!data || !data->conn)

    return CURLE_FAILED_INIT;

  if(!Curl_bufq_is_empty(&data->req.sendbuf)) {

    result = req_send_buffer_flush(data);

    if(result)

      return result;

    if(!Curl_bufq_is_empty(&data->req.sendbuf)) {

      DEBUGF(infof(data, "Curl_req_flush(len=%zu) -> EAGAIN",

                   Curl_bufq_len(&data->req.sendbuf)));

      return CURLE_AGAIN;

    }

  }

  else if(Curl_xfer_needs_flush(data)) {

    DEBUGF(infof(data, "Curl_req_flush(), xfer send_pending"));

    return Curl_xfer_flush(data);

  }

  if(data->req.eos_read && !data->req.eos_sent) {

    char tmp = 0;

    size_t nwritten;

    result = xfer_send(data, &tmp, 0, 0, &nwritten);

    if(result)

      return result;

    DEBUGASSERT(data->req.eos_sent);

  }

  if(!data->req.upload_done && data->req.eos_read && data->req.eos_sent) {

    DEBUGASSERT(Curl_bufq_is_empty(&data->req.sendbuf));

    if(data->req.shutdown) {

      bool done;

      result = Curl_xfer_send_shutdown(data, &done);

      if(result && data->req.shutdown_err_ignore) {

        infof(data, "Shutdown send direction error: %d. Broken server? "

              "Proceeding as if everything is ok.", (int)result);

        result = CURLE_OK;

        done = TRUE;

      }

      if(result)

        return result;

      if(!done)

        return CURLE_AGAIN;

    }

    return req_set_upload_done(data);

  }

  return CURLE_OK;

}

static CURLcode add_from_client(void *reader_ctx,

                                unsigned char *buf, size_t buflen,

                                size_t *pnread)

{

  struct Curl_easy *data = reader_ctx;

  CURLcode result;

  bool eos;

  result = Curl_client_read(data, (char *)buf, buflen, pnread, &eos);

  if(!result && eos)

    data->req.eos_read = TRUE;

  return result;

}

static CURLcode req_send_buffer_add(struct Curl_easy *data,

                                    const char *buf, size_t blen,

                                    size_t hds_len)

{

  CURLcode result = CURLE_OK;

  size_t n;

  result = Curl_bufq_cwrite(&data->req.sendbuf, buf, blen, &n);

  if(result)

    return result;

  /* We rely on a SOFTLIMIT on sendbuf, so it can take all data in */

  DEBUGASSERT(n == blen);

  data->req.sendbuf_hds_len += hds_len;

  return CURLE_OK;

}

CURLcode Curl_req_send(struct Curl_easy *data, struct dynbuf *req,

                       unsigned char httpversion)

{

  CURLcode result;

  const char *buf;

  size_t blen, nwritten;

  if(!data || !data->conn)

    return CURLE_FAILED_INIT;

  data->req.httpversion_sent = httpversion;

  buf = curlx_dyn_ptr(req);

  blen = curlx_dyn_len(req);

  /* if the sendbuf is empty and the request without body and

   * the length to send fits info a sendbuf chunk, we send it directly.

   * If `blen` is larger than `chunk_size`, we can not. Because we

   * might have to retry a blocked send later from sendbuf and that

   * would result in retry sends with a shrunken length. That is trouble. */

  if(Curl_bufq_is_empty(&data->req.sendbuf) &&

     !Curl_creader_total_length(data) &&

     (blen <= data->req.sendbuf.chunk_size)) {

    data->req.eos_read = TRUE;

    result = xfer_send(data, buf, blen, blen, &nwritten);

    if(result)

      return result;

    buf += nwritten;

    blen -= nwritten;

    if(!blen) {

      result = req_set_upload_done(data);

      if(result)

        return result;

    }

  }

  if(blen) {

    /* Either we have a request body, or we could not send the complete

     * request in one go. Buffer the remainder and try to add as much

     * body bytes as room is left in the buffer. Then flush. */

    result = req_send_buffer_add(data, buf, blen, blen);

    if(result)

      return result;

    return Curl_req_send_more(data);

  }

  return CURLE_OK;

}

bool Curl_req_sendbuf_empty(struct Curl_easy *data)

{

  return !data->req.sendbuf_init || Curl_bufq_is_empty(&data->req.sendbuf);

}

bool Curl_req_want_send(struct Curl_easy *data)

{

  /* Not done and upload not blocked and either one of

   * - REQ_IO_SEND

   * - request has buffered data to send

   * - connection has pending data to send */

  return !data->req.done &&

         !Curl_rlimit_is_blocked(&data->progress.ul.rlimit) &&

         (CURL_REQ_WANT_SEND(data) ||

          !Curl_req_sendbuf_empty(data) ||

          Curl_xfer_needs_flush(data));

}

bool Curl_req_want_recv(struct Curl_easy *data)

{

  /* Not done and download not blocked and want RECV */

  return !data->req.done &&

         !Curl_rlimit_is_blocked(&data->progress.dl.rlimit) &&

         CURL_REQ_WANT_RECV(data);

}

bool Curl_req_done_sending(struct Curl_easy *data)

{

  return data->req.upload_done && !Curl_req_want_send(data);

}

CURLcode Curl_req_send_more(struct Curl_easy *data)

{

  CURLcode result;

  /* Fill our send buffer if more from client can be read. */

  if(!data->req.upload_aborted &&

     !data->req.eos_read &&

     !Curl_xfer_send_is_paused(data) &&

     !Curl_bufq_is_full(&data->req.sendbuf)) {

    size_t nread;

    result = Curl_bufq_sipn(&data->req.sendbuf, 0,

                            add_from_client, data, &nread);

    if(result && result != CURLE_AGAIN)

      return result;

  }

  result = req_flush(data);

  if(result == CURLE_AGAIN)

    result = CURLE_OK;

  return result;

}

CURLcode Curl_req_abort_sending(struct Curl_easy *data)

{

  if(!data->req.upload_done) {

    Curl_bufq_reset(&data->req.sendbuf);

    data->req.upload_aborted = TRUE;

    CURL_REQ_CLEAR_SEND(data);

    return req_set_upload_done(data);

  }

  return CURLE_OK;

}

CURLcode Curl_req_stop_send_recv(struct Curl_easy *data)

{

  /* stop receiving and ALL sending as well, including PAUSE and HOLD.

   * We might still be paused on receive client writes though, so

   * keep those bits around. */

  CURLcode result = CURLE_OK;

  if(CURL_REQ_WANT_SEND(data))

    result = Curl_req_abort_sending(data);

  CURL_REQ_CLEAR_IO(data);

  return result;

}