Blame src/unix/getaddrinfo.c

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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to
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 * deal in the Software without restriction, including without limitation the
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 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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 * sell copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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 * IN THE SOFTWARE.
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 */
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/* Expose glibc-specific EAI_* error codes. Needs to be defined before we
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 * include any headers.
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 */
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#ifndef _GNU_SOURCE
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# define _GNU_SOURCE
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#endif
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#include "uv.h"
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#include "internal.h"
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#include "idna.h"
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#include <errno.h>
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#include <stddef.h> /* NULL */
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#include <stdlib.h>
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#include <string.h>
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#include <net/if.h> /* if_indextoname() */
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/* EAI_* constants. */
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#include <netdb.h>
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int uv__getaddrinfo_translate_error(int sys_err) {
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  switch (sys_err) {
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  case 0: return 0;
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#if defined(EAI_ADDRFAMILY)
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  case EAI_ADDRFAMILY: return UV_EAI_ADDRFAMILY;
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#endif
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#if defined(EAI_AGAIN)
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  case EAI_AGAIN: return UV_EAI_AGAIN;
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#endif
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#if defined(EAI_BADFLAGS)
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  case EAI_BADFLAGS: return UV_EAI_BADFLAGS;
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#endif
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#if defined(EAI_BADHINTS)
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  case EAI_BADHINTS: return UV_EAI_BADHINTS;
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#endif
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#if defined(EAI_CANCELED)
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  case EAI_CANCELED: return UV_EAI_CANCELED;
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#endif
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#if defined(EAI_FAIL)
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  case EAI_FAIL: return UV_EAI_FAIL;
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#endif
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#if defined(EAI_FAMILY)
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  case EAI_FAMILY: return UV_EAI_FAMILY;
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#endif
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#if defined(EAI_MEMORY)
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  case EAI_MEMORY: return UV_EAI_MEMORY;
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#endif
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#if defined(EAI_NODATA)
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  case EAI_NODATA: return UV_EAI_NODATA;
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#endif
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#if defined(EAI_NONAME)
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# if !defined(EAI_NODATA) || EAI_NODATA != EAI_NONAME
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  case EAI_NONAME: return UV_EAI_NONAME;
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# endif
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#endif
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#if defined(EAI_OVERFLOW)
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  case EAI_OVERFLOW: return UV_EAI_OVERFLOW;
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#endif
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#if defined(EAI_PROTOCOL)
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  case EAI_PROTOCOL: return UV_EAI_PROTOCOL;
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#endif
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#if defined(EAI_SERVICE)
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  case EAI_SERVICE: return UV_EAI_SERVICE;
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#endif
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#if defined(EAI_SOCKTYPE)
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  case EAI_SOCKTYPE: return UV_EAI_SOCKTYPE;
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#endif
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#if defined(EAI_SYSTEM)
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  case EAI_SYSTEM: return UV__ERR(errno);
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#endif
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  }
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  assert(!"unknown EAI_* error code");
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  abort();
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#ifndef __SUNPRO_C
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  return 0;  /* Pacify compiler. */
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#endif
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}
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static void uv__getaddrinfo_work(struct uv__work* w) {
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  uv_getaddrinfo_t* req;
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  int err;
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  req = container_of(w, uv_getaddrinfo_t, work_req);
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  err = getaddrinfo(req->hostname, req->service, req->hints, &req->addrinfo);
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  req->retcode = uv__getaddrinfo_translate_error(err);
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}
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static void uv__getaddrinfo_done(struct uv__work* w, int status) {
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  uv_getaddrinfo_t* req;
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  req = container_of(w, uv_getaddrinfo_t, work_req);
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  uv__req_unregister(req->loop, req);
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  /* See initialization in uv_getaddrinfo(). */
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  if (req->hints)
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    uv__free(req->hints);
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  else if (req->service)
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    uv__free(req->service);
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  else if (req->hostname)
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    uv__free(req->hostname);
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  else
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    assert(0);
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  req->hints = NULL;
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  req->service = NULL;
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  req->hostname = NULL;
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  if (status == UV_ECANCELED) {
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    assert(req->retcode == 0);
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    req->retcode = UV_EAI_CANCELED;
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  }
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  if (req->cb)
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    req->cb(req, req->retcode, req->addrinfo);
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}
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int uv_getaddrinfo(uv_loop_t* loop,
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                   uv_getaddrinfo_t* req,
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                   uv_getaddrinfo_cb cb,
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                   const char* hostname,
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                   const char* service,
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                   const struct addrinfo* hints) {
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  char hostname_ascii[256];
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  size_t hostname_len;
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  size_t service_len;
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  size_t hints_len;
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  size_t len;
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  char* buf;
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  long rc;
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  if (req == NULL || (hostname == NULL && service == NULL))
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    return UV_EINVAL;
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  /* FIXME(bnoordhuis) IDNA does not seem to work z/OS,
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   * probably because it uses EBCDIC rather than ASCII.
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   */
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#ifdef __MVS__
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  (void) &hostname_ascii;
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#else
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  if (hostname != NULL) {
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    rc = uv__idna_toascii(hostname,
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                          hostname + strlen(hostname),
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                          hostname_ascii,
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                          hostname_ascii + sizeof(hostname_ascii));
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    if (rc < 0)
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      return rc;
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    hostname = hostname_ascii;
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  }
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#endif
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  hostname_len = hostname ? strlen(hostname) + 1 : 0;
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  service_len = service ? strlen(service) + 1 : 0;
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  hints_len = hints ? sizeof(*hints) : 0;
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  buf = uv__malloc(hostname_len + service_len + hints_len);
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  if (buf == NULL)
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    return UV_ENOMEM;
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  uv__req_init(loop, req, UV_GETADDRINFO);
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  req->loop = loop;
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  req->cb = cb;
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  req->addrinfo = NULL;
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  req->hints = NULL;
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  req->service = NULL;
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  req->hostname = NULL;
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  req->retcode = 0;
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  /* order matters, see uv_getaddrinfo_done() */
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  len = 0;
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  if (hints) {
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    req->hints = memcpy(buf + len, hints, sizeof(*hints));
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    len += sizeof(*hints);
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  }
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  if (service) {
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    req->service = memcpy(buf + len, service, service_len);
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    len += service_len;
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  }
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  if (hostname)
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    req->hostname = memcpy(buf + len, hostname, hostname_len);
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  if (cb) {
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    uv__work_submit(loop,
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                    &req->work_req,
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                    UV__WORK_SLOW_IO,
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                    uv__getaddrinfo_work,
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                    uv__getaddrinfo_done);
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    return 0;
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  } else {
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    uv__getaddrinfo_work(&req->work_req);
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    uv__getaddrinfo_done(&req->work_req, 0);
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    return req->retcode;
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  }
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}
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void uv_freeaddrinfo(struct addrinfo* ai) {
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  if (ai)
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    freeaddrinfo(ai);
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}
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int uv_if_indextoname(unsigned int ifindex, char* buffer, size_t* size) {
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  char ifname_buf[UV_IF_NAMESIZE];
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  size_t len;
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  if (buffer == NULL || size == NULL || *size == 0)
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    return UV_EINVAL;
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  if (if_indextoname(ifindex, ifname_buf) == NULL)
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    return UV__ERR(errno);
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  len = strnlen(ifname_buf, sizeof(ifname_buf));
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  if (*size <= len) {
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    *size = len + 1;
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    return UV_ENOBUFS;
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  }
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  memcpy(buffer, ifname_buf, len);
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  buffer[len] = '\0';
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  *size = len;
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  return 0;
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}
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int uv_if_indextoiid(unsigned int ifindex, char* buffer, size_t* size) {
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  return uv_if_indextoname(ifindex, buffer, size);
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}