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

 *                                  _   _ ____  _

 *  Project                     ___| | | |  _ \| |

 *                             / __| | | | |_) | |

 *                            | (__| |_| |  _ <| |___

 *                             \___|\___/|_| \_\_____|

 *

 * Copyright (C) 1998 - 2022, 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"

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

 * Only for IPv6-enabled builds

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

#ifdef CURLRES_IPV6

#ifdef HAVE_NETINET_IN_H

#include <netinet/in.h>

#endif

#ifdef HAVE_NETDB_H

#include <netdb.h>

#endif

#ifdef HAVE_ARPA_INET_H

#include <arpa/inet.h>

#endif

#ifdef __VMS

#include <in.h>

#include <inet.h>

#endif

#ifdef HAVE_PROCESS_H

#include <process.h>

#endif

#include "urldata.h"

#include "sendf.h"

#include "hostip.h"

#include "hash.h"

#include "share.h"

#include "url.h"

#include "inet_pton.h"

#include "connect.h"

/* The last 3 #include files should be in this order */

#include "curl_printf.h"

#include "curl_memory.h"

#include "memdebug.h"

/*

 * Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've

 * been set and returns TRUE if they are OK.

 */

bool Curl_ipvalid(struct Curl_easy *data, struct connectdata *conn)

{

  if(conn->ip_version == CURL_IPRESOLVE_V6)

    return Curl_ipv6works(data);

  return TRUE;

}

#if defined(CURLRES_SYNCH)

#ifdef DEBUG_ADDRINFO

static void dump_addrinfo(struct connectdata *conn,

                          const struct Curl_addrinfo *ai)

{

  printf("dump_addrinfo:\n");

  for(; ai; ai = ai->ai_next) {

    char buf[INET6_ADDRSTRLEN];

    printf("    fam %2d, CNAME %s, ",

           ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");

    Curl_printable_address(ai, buf, sizeof(buf));

    printf("%s\n", buf);

  }

}

#else

#define dump_addrinfo(x,y) Curl_nop_stmt

#endif

/*

 * Curl_getaddrinfo() when built IPv6-enabled (non-threading and

 * non-ares version).

 *

 * Returns name information about the given hostname and port number. If

 * successful, the 'addrinfo' is returned and the fourth argument will point

 * to memory we need to free after use. That memory *MUST* be freed with

 * Curl_freeaddrinfo(), nothing else.

 */

struct Curl_addrinfo *Curl_getaddrinfo(struct Curl_easy *data,

                                       const char *hostname,

                                       int port,

                                       int *waitp)

{

  struct addrinfo hints;

  struct Curl_addrinfo *res;

  int error;

  char sbuf[12];

  char *sbufptr = NULL;

#ifndef USE_RESOLVE_ON_IPS

  char addrbuf[128];

#endif

  int pf = PF_INET;

  *waitp = 0; /* synchronous response only */

  if((data->conn->ip_version != CURL_IPRESOLVE_V4) && Curl_ipv6works(data))

    /* The stack seems to be IPv6-enabled */

    pf = PF_UNSPEC;

  memset(&hints, 0, sizeof(hints));

  hints.ai_family = pf;

  hints.ai_socktype = (data->conn->transport == TRNSPRT_TCP) ?

    SOCK_STREAM : SOCK_DGRAM;

#ifndef USE_RESOLVE_ON_IPS

  /*

   * The AI_NUMERICHOST must not be set to get synthesized IPv6 address from

   * an IPv4 address on iOS and Mac OS X.

   */

  if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||

     (1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {

    /* the given address is numerical only, prevent a reverse lookup */

    hints.ai_flags = AI_NUMERICHOST;

  }

#endif

  if(port) {

    msnprintf(sbuf, sizeof(sbuf), "%d", port);

    sbufptr = sbuf;

  }

  error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);

  if(error) {

    infof(data, "getaddrinfo(3) failed for %s:%d", hostname, port);

    return NULL;

  }

  if(port) {

    Curl_addrinfo_set_port(res, port);

  }

  dump_addrinfo(conn, res);

  return res;

}

#endif /* CURLRES_SYNCH */

#endif /* CURLRES_IPV6 */