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

 *                                  _   _ ____  _

 *  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 "curl_trc.h"

#include "strerror.h"

#include "cfilters.h"

#include "connect.h"

#include "cf-https-connect.h"

#include "cf-setup.h"

#include "multiif.h"

#include "progress.h"

#include "conncache.h"

#include "multihandle.h"

#include "select.h"

#include "vdns/cf-dns.h"

#include "curlx/strparse.h"

#if !defined(CURL_DISABLE_ALTSVC) || defined(USE_HTTPSRR)

enum alpnid Curl_alpn2alpnid(const unsigned char *name, size_t len)

{

  if(len == 2) {

    if(!memcmp(name, "h1", 2))

      return ALPN_h1;

    if(!memcmp(name, "h2", 2))

      return ALPN_h2;

    if(!memcmp(name, "h3", 2))

      return ALPN_h3;

  }

  else if(len == 8) {

    if(!memcmp(name, "http/1.1", 8))

      return ALPN_h1;

  }

  return ALPN_none; /* unknown, probably rubbish input */

}

#endif

/*

 * timeleft_now_ms() returns the amount of milliseconds left allowed for the

 * transfer/connection. If the value is 0, there is no timeout (ie there is

 * infinite time left). If the value is negative, the timeout time has already

 * elapsed.

 *

 * @unittest 1303

 */

UNITTEST timediff_t timeleft_now_ms(struct Curl_easy *data,

                                    const struct curltime *pnow);

UNITTEST timediff_t timeleft_now_ms(struct Curl_easy *data,

                                    const struct curltime *pnow)

{

  timediff_t timeleft_ms = 0;

  timediff_t ctimeleft_ms = 0;

  if(data->conn && Curl_shutdown_started(data->conn, FIRSTSOCKET))

    return Curl_shutdown_timeleft(data, data->conn, FIRSTSOCKET);

  else if(Curl_is_connecting(data)) {

    timediff_t ctimeout_ms = (data->set.connecttimeout > 0) ?

      data->set.connecttimeout : DEFAULT_CONNECT_TIMEOUT;

    ctimeleft_ms = ctimeout_ms -

      Curl_pgrs_since_ms(data, pnow, TIMER_STARTSINGLE);

    if(!ctimeleft_ms)

      ctimeleft_ms = -1; /* 0 is "no limit", fake 1 ms expiry */

  }

  else if(!data->set.timeout || data->set.connect_only) {

    return 0; /* no timeout in place or checked, return "no limit" */

  }

  if(data->set.timeout) {

    timeleft_ms = data->set.timeout -

                  Curl_pgrs_since_ms(data, pnow, TIMER_STARTOP);

    if(!timeleft_ms)

      timeleft_ms = -1; /* 0 is "no limit", fake 1 ms expiry */

  }

  if(!ctimeleft_ms)

    return timeleft_ms;

  else if(!timeleft_ms)

    return ctimeleft_ms;

  return CURLMIN(ctimeleft_ms, timeleft_ms);

}

timediff_t Curl_timeleft_ms(struct Curl_easy *data)

{

  return timeleft_now_ms(data, Curl_pgrs_now(data));

}

timediff_t Curl_timeleft_now_ms(struct Curl_easy *data,

                                const struct curltime *pnow)

{

  return timeleft_now_ms(data, pnow);

}

void Curl_shutdown_start(struct Curl_easy *data, int8_t sockindex,

                         int timeout_ms)

{

  struct connectdata *conn = data->conn;

  const struct curltime *pnow = Curl_pgrs_now(data);

  DEBUGASSERT(conn);

  conn->shutdown.start[sockindex] = *pnow;

  conn->shutdown.timeout_ms = (timeout_ms > 0) ?

    (timediff_t)timeout_ms :

    ((data->set.shutdowntimeout > 0) ?

     data->set.shutdowntimeout : DEFAULT_SHUTDOWN_TIMEOUT_MS);

  /* Set a timer, unless we operate on the admin handle */

  if(data->mid)

    Curl_expire_set(data, EXPIRE_SHUTDOWN, conn->shutdown.timeout_ms, pnow);

  CURL_TRC_M(data, "shutdown start on%s connection",

             sockindex ? " secondary" : "");

}

timediff_t Curl_shutdown_timeleft(struct Curl_easy *data,

                                  struct connectdata *conn,

                                  int8_t sockindex)

{

  timediff_t left_ms;

  if(!conn->shutdown.start[sockindex].tv_sec ||

     (conn->shutdown.timeout_ms <= 0))

    return 0; /* not started or no limits */

  left_ms = conn->shutdown.timeout_ms -

            curlx_ptimediff_ms(Curl_pgrs_now(data),

                               &conn->shutdown.start[sockindex]);

  return left_ms ? left_ms : -1;

}

timediff_t Curl_conn_shutdown_timeleft(struct Curl_easy *data,

                                       struct connectdata *conn)

{

  timediff_t left_ms = 0, ms;

  int8_t i;

  for(i = 0; conn->shutdown.timeout_ms && (i < 2); ++i) {

    if(!conn->shutdown.start[i].tv_sec)

      continue;

    ms = Curl_shutdown_timeleft(data, conn, i);

    if(ms && (!left_ms || ms < left_ms))

      left_ms = ms;

  }

  return left_ms;

}

void Curl_shutdown_clear(struct Curl_easy *data, int8_t sockindex)

{

  struct curltime *pt = &data->conn->shutdown.start[sockindex];

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

}

bool Curl_shutdown_started(struct connectdata *conn, int8_t sockindex)

{

  const struct curltime *pt = &conn->shutdown.start[sockindex];

  return (pt->tv_sec > 0) || (pt->tv_usec > 0);

}

/*

 * Used to extract socket and connectdata struct for the most recent

 * transfer on the given Curl_easy.

 *

 * The returned socket will be CURL_SOCKET_BAD in case of failure!

 */

curl_socket_t Curl_getconnectinfo(struct Curl_easy *data,

                                  struct connectdata **connp)

{

  DEBUGASSERT(data);

  /* this works for an easy handle:

   * - that has been used for curl_easy_perform()

   * - that is associated with a multi handle, and whose connection

   *   was detached with CURLOPT_CONNECT_ONLY

   */

  if(data->state.lastconnect_id != -1) {

    struct connectdata *conn;

    conn = Curl_cpool_get_conn(data, data->state.lastconnect_id);

    if(!conn) {

      data->state.lastconnect_id = -1;

      if(connp)

        *connp = NULL;

      return CURL_SOCKET_BAD;

    }

    if(connp)

      *connp = conn;

    return conn->sock[FIRSTSOCKET];

  }

  if(connp)

    *connp = NULL;

  return CURL_SOCKET_BAD;

}

void Curl_conncontrol(struct connectdata *conn, int ctrl)

{

  if(!conn) {

    DEBUGASSERT(0);

    return;

  }

  switch(ctrl) {

    case CONNCTRL_CONN_KEEP:

      conn->bits.close = FALSE;

      break;

    case CONNCTRL_CONN_CLOSE:

      conn->bits.close = TRUE;

      break;

    case CONNCTRL_STREAM_CLOSE:

      /* stream close when multiplexing does not affect connection */

      if(!Curl_conn_is_multiplex(conn, FIRSTSOCKET))

        conn->bits.close = TRUE;

      break;

    default:

      DEBUGASSERT(0);

      break;

  }

}

CURLcode Curl_conn_setup(struct Curl_easy *data,

                         struct connectdata *conn,

                         int8_t sockindex,

                         int ssl_mode)

{

  struct Curl_peer *first_peer = Curl_conn_get_first_peer(conn, sockindex);

  CURLcode result = CURLE_OK;

  uint8_t dns_queries;

  DEBUGASSERT(data);

  DEBUGASSERT(conn->scheme);

  DEBUGASSERT(!conn->cfilter[sockindex]);

  if(!first_peer)

    return CURLE_FAILED_INIT;

#ifndef CURL_DISABLE_HTTP

  if(!conn->cfilter[sockindex] &&

     conn->scheme->protocol == CURLPROTO_HTTPS) {

    DEBUGASSERT(ssl_mode != CURL_CF_SSL_DISABLE);

    result = Curl_cf_https_setup(

      data, Curl_conn_get_destination(conn, sockindex), conn, sockindex);

    if(result)

      goto out;

  }

#endif /* !CURL_DISABLE_HTTP */

  /* Still no cfilter set, apply default. */

  if(!conn->cfilter[sockindex]) {

    result = Curl_cf_setup_add(data, conn, sockindex,

                               conn->transport_wanted, ssl_mode);

    if(result)

      goto out;

  }

  /* Whatever the filter chain will be in the end, it will need the

   * resolving of `first_peer`. Add that now so the resolve is started

   * right away. */

  dns_queries = Curl_resolv_dns_queries(data, conn->ip_version);

  result = Curl_conn_dns_add_addr_resolve(data, conn, sockindex,

                                          first_peer, dns_queries,

                                          conn->transport_wanted);

  if(result)

    goto out;

  DEBUGASSERT(conn->cfilter[sockindex]);

out:

  return result;

}

#ifdef CURLVERBOSE

static CURLcode conn_connect_trace(struct Curl_easy *data,

                                   struct Curl_cfilter *cf)

{

  if(Curl_trc_is_verbose(data)) {

    struct ip_quadruple ipquad;

    bool is_ipv6;

    CURLcode result;

    result = Curl_conn_cf_get_ip_info(cf, data, &is_ipv6, &ipquad);

    if(result)

      return result;

    infof(data, "Established %sconnection to %s (%s port %u) from %s port %u ",

          (cf->sockindex == SECONDARYSOCKET) ? "2nd " : "",

          CURL_CONN_HOST_DISPNAME(data->conn),

          ipquad.remote_ip, ipquad.remote_port,

          ipquad.local_ip, ipquad.local_port);

  }

  return CURLE_OK;

}

#endif

/**

 * Update connection statistics

 */

static void conn_report_stats(struct Curl_easy *data, int sockindex)

{

  /* We do gather stats for the second socket...yet */

  if(sockindex == FIRSTSOCKET) {

    Curl_conn_cntrl_report_stats(data, data->conn, sockindex);

  }

}

CURLcode Curl_conn_connect(struct Curl_easy *data,

                           int8_t sockindex,

                           bool blocking,

                           bool *done)

{

#define CF_CONN_NUM_POLLS_ON_STACK 5

  struct pollfd a_few_on_stack[CF_CONN_NUM_POLLS_ON_STACK];

  struct easy_pollset ps;

  struct curl_pollfds cpfds;

  struct Curl_cfilter *cf;

  CURLcode result = CURLE_OK;

  DEBUGASSERT(data);

  DEBUGASSERT(data->conn);

  if(!CONN_SOCK_IDX_VALID(sockindex))

    return CURLE_BAD_FUNCTION_ARGUMENT;

  if(data->conn->scheme->flags & PROTOPT_NONETWORK) {

    *done = TRUE;

    return CURLE_OK;

  }

  cf = data->conn->cfilter[sockindex];

  if(!cf) {

    *done = FALSE;

    return CURLE_FAILED_INIT;

  }

  *done = (bool)cf->connected;

  if(*done)

    return CURLE_OK;

  Curl_pollset_init(&ps);

  Curl_pollfds_init(&cpfds, a_few_on_stack, CF_CONN_NUM_POLLS_ON_STACK);

  while(!*done) {

    if(Curl_conn_needs_flush(data, sockindex)) {

      DEBUGF(infof(data, "Curl_conn_connect(index=%d), flush", sockindex));

      result = Curl_conn_flush(data, sockindex);

      if(result && (result != CURLE_AGAIN))

        goto out;

    }

    result = cf->cft->do_connect(cf, data, done);

    CURL_TRC_CF(data, cf, "Curl_conn_connect(block=%d) -> %d, done=%d",

                blocking, (int)result, *done);

    if(!result && *done) {

      /* A final sanity check on connection security */

      if((data->state.origin->scheme->flags & PROTOPT_SSL) &&

         (sockindex == FIRSTSOCKET) &&

         !Curl_conn_is_ssl(data->conn, FIRSTSOCKET)) {

        DEBUGASSERT(0);

        failf(data, "transfer requires SSL, but not connected via SSL");

        result = CURLE_FAILED_INIT;

        goto out;

      }

      /* Now that the complete filter chain is connected, let all filters

       * persist information at the connection. E.g. cf-socket sets the

       * socket and ip related information. */

      Curl_conn_cntrl_update_info(data, data->conn);

      conn_report_stats(data, sockindex);

      data->conn->lastupkeep = *Curl_pgrs_now(data);

      VERBOSE(result = conn_connect_trace(data, cf));

      VERBOSE(Curl_conn_trc_filters(data, sockindex, "connected"));

      Curl_conn_remove_setup_filters(data, sockindex);

      VERBOSE(Curl_conn_trc_filters(data, sockindex, "reduced to"));

      goto out;

    }

    else if(result) {

      CURL_TRC_CF(data, cf, "Curl_conn_connect(), filter returned %d",

                  (int)result);

      VERBOSE(Curl_conn_trc_filters(data, sockindex, "failed to connect"));

      conn_report_stats(data, sockindex);

      goto out;

    }

    if(!blocking)

      goto out;

    else {

      /* check allowed time left */

      const timediff_t timeout_ms = Curl_timeleft_ms(data);

      curl_socket_t sockfd = Curl_conn_cf_get_socket(cf, data);

      int rc;

      if(timeout_ms < 0) {

        /* no need to continue if time already is up */

        failf(data, "connect timeout");

        result = CURLE_OPERATION_TIMEDOUT;

        goto out;

      }

      CURL_TRC_CF(data, cf, "Curl_conn_connect(block=1), do poll");

      Curl_pollset_reset(&ps);

      Curl_pollfds_reset(&cpfds);

      /* In general, we want to send after connect, wait on that. */

      if(sockfd != CURL_SOCKET_BAD)

        result = Curl_pollset_set_out_only(data, &ps, sockfd);

      if(!result)

        result = Curl_conn_adjust_pollset(data, data->conn, &ps);

      if(result)

        goto out;

      result = Curl_pollfds_add_ps(&cpfds, &ps);

      if(result)

        goto out;

      rc = Curl_poll(cpfds.pfds, cpfds.n,

                     CURLMIN(timeout_ms, (cpfds.n ? 1000 : 10)));

      CURL_TRC_CF(data, cf, "Curl_conn_connect(block=1), Curl_poll() -> %d",

                  rc);

      if(rc < 0) {

        result = CURLE_COULDNT_CONNECT;

        goto out;

      }

      /* continue iterating */

    }

  }

out:

  Curl_pollset_cleanup(&ps);

  Curl_pollfds_cleanup(&cpfds);

  return result;

}

void Curl_conn_set_multiplex(struct connectdata *conn)

{

  if(!conn->bits.multiplex) {

    conn->bits.multiplex = TRUE;

    if(conn->attached_multi) {

      Curl_multi_connchanged(conn->attached_multi);

    }

  }

}

struct Curl_peer *Curl_conn_get_origin(struct connectdata *conn,

                                       int8_t sockindex)

{

  return (sockindex == SECONDARYSOCKET) ?

    conn->origin2 : conn->origin;

}

struct Curl_peer *Curl_conn_get_destination(struct connectdata *conn,

                                            int8_t sockindex)

{

  return (sockindex == SECONDARYSOCKET) ?

    (conn->via_peer2 ? conn->via_peer2 : conn->origin2) :

    (conn->via_peer ? conn->via_peer : conn->origin);

}

struct Curl_peer *Curl_conn_get_first_peer(struct connectdata *conn,

                                           int8_t sockindex)

{

#ifndef CURL_DISABLE_PROXY

  if(conn->socks_proxy.peer)

    return conn->socks_proxy.peer;

  if(conn->http_proxy.peer)

    return conn->http_proxy.peer;

#endif

  return (sockindex == SECONDARYSOCKET) ?

    (conn->via_peer2 ? conn->via_peer2 : conn->origin2) :

    (conn->via_peer ? conn->via_peer : conn->origin);

}