7957

pending completion

Build # 7957

Build Type

Pull #2618

travis-ci

Committed by

web-flow

Commit Message

KNOWN_BUGS: restore text regarding #2101.

This was added earlier but appears to have
been removed accidentally.

AFAICT this is very much still an issue.

-----

I say "accidentally" because the text
seems to have harmlessly snuck into [1]
(which makes no mention of it).
[1] was later reverted for unspecified
reasons in [2], presumably because the
mentioned issue was fixed or invalid.

[1] de9fac00c
[2] 16d1f3694

Pull Request Pull Request #2618: KNOWN_BUGS: restore text regarding #2101.

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93.33

/lib/asyn-thread.c

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2018, 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.haxx.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.
 *
 ***************************************************************************/

#include "curl_setup.h"

/***********************************************************************
 * Only for threaded name resolves builds
 **********************************************************************/
#ifdef CURLRES_THREADED

#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

#if defined(USE_THREADS_POSIX)
#  ifdef HAVE_PTHREAD_H
#    include <pthread.h>
#  endif
#elif defined(USE_THREADS_WIN32)
#  ifdef HAVE_PROCESS_H
#    include <process.h>
#  endif
#endif

#if (defined(NETWARE) && defined(__NOVELL_LIBC__))
#undef in_addr_t
#define in_addr_t unsigned long
#endif

#ifdef HAVE_GETADDRINFO
#  define RESOLVER_ENOMEM  EAI_MEMORY
#else
#  define RESOLVER_ENOMEM  ENOMEM
#endif

#include "urldata.h"
#include "sendf.h"
#include "hostip.h"
#include "hash.h"
#include "share.h"
#include "strerror.h"
#include "url.h"
#include "multiif.h"
#include "inet_pton.h"
#include "inet_ntop.h"
#include "curl_threads.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"

struct resdata {
  struct curltime start;
};

/*
 * Curl_resolver_global_init()
 * Called from curl_global_init() to initialize global resolver environment.
 * Does nothing here.
 */
int Curl_resolver_global_init(void)
{
  return CURLE_OK;
}

/*
 * Curl_resolver_global_cleanup()
 * Called from curl_global_cleanup() to destroy global resolver environment.
 * Does nothing here.
 */
void Curl_resolver_global_cleanup(void)
{
}

/*
 * Curl_resolver_init()
 * Called from curl_easy_init() -> Curl_open() to initialize resolver
 * URL-state specific environment ('resolver' member of the UrlState
 * structure).
 */
CURLcode Curl_resolver_init(void **resolver)
{
  *resolver = calloc(1, sizeof(struct resdata));
  if(!*resolver)
    return CURLE_OUT_OF_MEMORY;
  return CURLE_OK;
}

/*
 * Curl_resolver_cleanup()
 * Called from curl_easy_cleanup() -> Curl_close() to cleanup resolver
 * URL-state specific environment ('resolver' member of the UrlState
 * structure).
 */
void Curl_resolver_cleanup(void *resolver)
{
  free(resolver);
}

/*
 * Curl_resolver_duphandle()
 * Called from curl_easy_duphandle() to duplicate resolver URL state-specific
 * environment ('resolver' member of the UrlState structure).
 */
int Curl_resolver_duphandle(void **to, void *from)
{
  (void)from;
  return Curl_resolver_init(to);
}

static void destroy_async_data(struct Curl_async *);

/*
 * Cancel all possibly still on-going resolves for this connection.
 */
void Curl_resolver_cancel(struct connectdata *conn)
{
  destroy_async_data(&conn->async);
}

/* This function is used to init a threaded resolve */
static bool init_resolve_thread(struct connectdata *conn,
                                const char *hostname, int port,
                                const struct addrinfo *hints);


/* Data for synchronization between resolver thread and its parent */
struct thread_sync_data {
  curl_mutex_t * mtx;
  int done;

  char *hostname;        /* hostname to resolve, Curl_async.hostname
                            duplicate */
  int port;
  int sock_error;
  Curl_addrinfo *res;
#ifdef HAVE_GETADDRINFO
  struct addrinfo hints;
#endif
  struct thread_data *td; /* for thread-self cleanup */
};

struct thread_data {
  curl_thread_t thread_hnd;
  unsigned int poll_interval;
  time_t interval_end;
  struct thread_sync_data tsd;
};

static struct thread_sync_data *conn_thread_sync_data(struct connectdata *conn)
{
  return &(((struct thread_data *)conn->async.os_specific)->tsd);
}

#define CONN_THREAD_SYNC_DATA(conn) &(((conn)->async.os_specific)->tsd);

/* Destroy resolver thread synchronization data */
static
void destroy_thread_sync_data(struct thread_sync_data * tsd)
{
  if(tsd->mtx) {
    Curl_mutex_destroy(tsd->mtx);
    free(tsd->mtx);
  }

  free(tsd->hostname);

  if(tsd->res)
    Curl_freeaddrinfo(tsd->res);

  memset(tsd, 0, sizeof(*tsd));
}

/* Initialize resolver thread synchronization data */
static
int init_thread_sync_data(struct thread_data * td,
                           const char *hostname,
                           int port,
                           const struct addrinfo *hints)
{
  struct thread_sync_data *tsd = &td->tsd;

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

  tsd->td = td;
  tsd->port = port;
  /* Treat the request as done until the thread actually starts so any early
   * cleanup gets done properly.
   */
  tsd->done = 1;
#ifdef HAVE_GETADDRINFO
  DEBUGASSERT(hints);
  tsd->hints = *hints;
#else
  (void) hints;
#endif

  tsd->mtx = malloc(sizeof(curl_mutex_t));
  if(tsd->mtx == NULL)
    goto err_exit;

  Curl_mutex_init(tsd->mtx);

  tsd->sock_error = CURL_ASYNC_SUCCESS;

  /* Copying hostname string because original can be destroyed by parent
   * thread during gethostbyname execution.
   */
  tsd->hostname = strdup(hostname);
  if(!tsd->hostname)
    goto err_exit;

  return 1;

 err_exit:
  /* Memory allocation failed */
  destroy_thread_sync_data(tsd);
  return 0;
}

static int getaddrinfo_complete(struct connectdata *conn)
{
  struct thread_sync_data *tsd = conn_thread_sync_data(conn);
  int rc;

  rc = Curl_addrinfo_callback(conn, tsd->sock_error, tsd->res);
  /* The tsd->res structure has been copied to async.dns and perhaps the DNS
     cache.  Set our copy to NULL so destroy_thread_sync_data doesn't free it.
  */
  tsd->res = NULL;

  return rc;
}


#ifdef HAVE_GETADDRINFO

/*
 * getaddrinfo_thread() resolves a name and then exits.
 *
 * For builds without ARES, but with ENABLE_IPV6, create a resolver thread
 * and wait on it.
 */
static unsigned int CURL_STDCALL getaddrinfo_thread(void *arg)
{
  struct thread_sync_data *tsd = (struct thread_sync_data*)arg;
  struct thread_data *td = tsd->td;
  char service[12];
  int rc;

  snprintf(service, sizeof(service), "%d", tsd->port);

  rc = Curl_getaddrinfo_ex(tsd->hostname, service, &tsd->hints, &tsd->res);

  if(rc != 0) {
    tsd->sock_error = SOCKERRNO?SOCKERRNO:rc;
    if(tsd->sock_error == 0)
      tsd->sock_error = RESOLVER_ENOMEM;
  }
  else {
    Curl_addrinfo_set_port(tsd->res, tsd->port);
  }

  Curl_mutex_acquire(tsd->mtx);
  if(tsd->done) {
    /* too late, gotta clean up the mess */
    Curl_mutex_release(tsd->mtx);
    destroy_thread_sync_data(tsd);
    free(td);
  }
  else {
    tsd->done = 1;
    Curl_mutex_release(tsd->mtx);
  }

  return 0;
}

#else /* HAVE_GETADDRINFO */

/*
 * gethostbyname_thread() resolves a name and then exits.
 */
static unsigned int CURL_STDCALL gethostbyname_thread(void *arg)
{
  struct thread_sync_data *tsd = (struct thread_sync_data *)arg;
  struct thread_data *td = tsd->td;

  tsd->res = Curl_ipv4_resolve_r(tsd->hostname, tsd->port);

  if(!tsd->res) {
    tsd->sock_error = SOCKERRNO;
    if(tsd->sock_error == 0)
      tsd->sock_error = RESOLVER_ENOMEM;
  }

  Curl_mutex_acquire(tsd->mtx);
  if(tsd->done) {
    /* too late, gotta clean up the mess */
    Curl_mutex_release(tsd->mtx);
    destroy_thread_sync_data(tsd);
    free(td);
  }
  else {
    tsd->done = 1;
    Curl_mutex_release(tsd->mtx);
  }

  return 0;
}

#endif /* HAVE_GETADDRINFO */

/*
 * destroy_async_data() cleans up async resolver data and thread handle.
 */
static void destroy_async_data(struct Curl_async *async)
{
  if(async->os_specific) {
    struct thread_data *td = (struct thread_data*) async->os_specific;
    int done;

    /*
     * if the thread is still blocking in the resolve syscall, detach it and
     * let the thread do the cleanup...
     */
    Curl_mutex_acquire(td->tsd.mtx);
    done = td->tsd.done;
    td->tsd.done = 1;
    Curl_mutex_release(td->tsd.mtx);

    if(!done) {
      Curl_thread_destroy(td->thread_hnd);
    }
    else {
      if(td->thread_hnd != curl_thread_t_null)
        Curl_thread_join(&td->thread_hnd);

      destroy_thread_sync_data(&td->tsd);

      free(async->os_specific);
    }
  }
  async->os_specific = NULL;

  free(async->hostname);
  async->hostname = NULL;
}

/*
 * init_resolve_thread() starts a new thread that performs the actual
 * resolve. This function returns before the resolve is done.
 *
 * Returns FALSE in case of failure, otherwise TRUE.
 */
static bool init_resolve_thread(struct connectdata *conn,
                                const char *hostname, int port,
                                const struct addrinfo *hints)
{
  struct thread_data *td = calloc(1, sizeof(struct thread_data));
  int err = ENOMEM;

  conn->async.os_specific = (void *)td;
  if(!td)
    goto errno_exit;

  conn->async.port = port;
  conn->async.done = FALSE;
  conn->async.status = 0;
  conn->async.dns = NULL;
  td->thread_hnd = curl_thread_t_null;

  if(!init_thread_sync_data(td, hostname, port, hints)) {
    conn->async.os_specific = NULL;
    free(td);
    goto errno_exit;
  }

  free(conn->async.hostname);
  conn->async.hostname = strdup(hostname);
  if(!conn->async.hostname)
    goto err_exit;

  /* The thread will set this to 1 when complete. */
  td->tsd.done = 0;

#ifdef HAVE_GETADDRINFO
  td->thread_hnd = Curl_thread_create(getaddrinfo_thread, &td->tsd);
#else
  td->thread_hnd = Curl_thread_create(gethostbyname_thread, &td->tsd);
#endif

  if(!td->thread_hnd) {
    /* The thread never started, so mark it as done here for proper cleanup. */
    td->tsd.done = 1;
    err = errno;
    goto err_exit;
  }

  return TRUE;

 err_exit:
  destroy_async_data(&conn->async);

 errno_exit:
  errno = err;
  return FALSE;
}

/*
 * resolver_error() calls failf() with the appropriate message after a resolve
 * error
 */

static CURLcode resolver_error(struct connectdata *conn)
{
  const char *host_or_proxy;
  CURLcode result;

  if(conn->bits.httpproxy) {
    host_or_proxy = "proxy";
    result = CURLE_COULDNT_RESOLVE_PROXY;
  }
  else {
    host_or_proxy = "host";
    result = CURLE_COULDNT_RESOLVE_HOST;
  }

  failf(conn->data, "Could not resolve %s: %s", host_or_proxy,
        conn->async.hostname);

  return result;
}

/*
 * Curl_resolver_wait_resolv()
 *
 * waits for a resolve to finish. This function should be avoided since using
 * this risk getting the multi interface to "hang".
 *
 * If 'entry' is non-NULL, make it point to the resolved dns entry
 *
 * This is the version for resolves-in-a-thread.
 */
CURLcode Curl_resolver_wait_resolv(struct connectdata *conn,
                                   struct Curl_dns_entry **entry)
{
  struct thread_data   *td = (struct thread_data*) conn->async.os_specific;
  CURLcode result = CURLE_OK;

  DEBUGASSERT(conn && td);

  /* wait for the thread to resolve the name */
  if(Curl_thread_join(&td->thread_hnd))
    result = getaddrinfo_complete(conn);
  else
    DEBUGASSERT(0);

  conn->async.done = TRUE;

  if(entry)
    *entry = conn->async.dns;

  if(!conn->async.dns)
    /* a name was not resolved, report error */
    result = resolver_error(conn);

  destroy_async_data(&conn->async);

  if(!conn->async.dns)
    connclose(conn, "asynch resolve failed");

  return result;
}

/*
 * Curl_resolver_is_resolved() is called repeatedly to check if a previous
 * name resolve request has completed. It should also make sure to time-out if
 * the operation seems to take too long.
 */
CURLcode Curl_resolver_is_resolved(struct connectdata *conn,
                                   struct Curl_dns_entry **entry)
{
  struct Curl_easy *data = conn->data;
  struct thread_data   *td = (struct thread_data*) conn->async.os_specific;
  int done = 0;

  *entry = NULL;

  if(!td) {
    DEBUGASSERT(td);
    return CURLE_COULDNT_RESOLVE_HOST;
  }

  Curl_mutex_acquire(td->tsd.mtx);
  done = td->tsd.done;
  Curl_mutex_release(td->tsd.mtx);

  if(done) {
    getaddrinfo_complete(conn);

    if(!conn->async.dns) {
      CURLcode result = resolver_error(conn);
      destroy_async_data(&conn->async);
      return result;
    }
    destroy_async_data(&conn->async);
    *entry = conn->async.dns;
  }
  else {
    /* poll for name lookup done with exponential backoff up to 250ms */
    timediff_t elapsed = Curl_timediff(Curl_now(),
                                       data->progress.t_startsingle);
    if(elapsed < 0)
      elapsed = 0;

    if(td->poll_interval == 0)
      /* Start at 1ms poll interval */
      td->poll_interval = 1;
    else if(elapsed >= td->interval_end)
      /* Back-off exponentially if last interval expired  */
      td->poll_interval *= 2;

    if(td->poll_interval > 250)
      td->poll_interval = 250;

    td->interval_end = elapsed + td->poll_interval;
    Curl_expire(conn->data, td->poll_interval, EXPIRE_ASYNC_NAME);
  }

  return CURLE_OK;
}

int Curl_resolver_getsock(struct connectdata *conn,
                          curl_socket_t *socks,
                          int numsocks)
{
  time_t milli;
  timediff_t ms;
  struct Curl_easy *data = conn->data;
  struct resdata *reslv = (struct resdata *)data->state.resolver;
  (void)socks;
  (void)numsocks;
  ms = Curl_timediff(Curl_now(), reslv->start);
  if(ms < 10)
    milli = ms/3;
  else if(ms <= 50)
    milli = 10;
  else if(ms <= 250)
    milli = 50;
  else
    milli = 200;
  Curl_expire(data, milli, EXPIRE_ASYNC_NAME);
  return 0;
}

#ifndef HAVE_GETADDRINFO
/*
 * Curl_getaddrinfo() - for platforms without getaddrinfo
 */
Curl_addrinfo *Curl_resolver_getaddrinfo(struct connectdata *conn,
                                         const char *hostname,
                                         int port,
                                         int *waitp)
{
  struct in_addr in;
  struct Curl_easy *data = conn->data;
  struct resdata *reslv = (struct resdata *)data->state.resolver;

  *waitp = 0; /* default to synchronous response */

  if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
    /* This is a dotted IP address 123.123.123.123-style */
    return Curl_ip2addr(AF_INET, &in, hostname, port);

  reslv->start = Curl_now();

  /* fire up a new resolver thread! */
  if(init_resolve_thread(conn, hostname, port, NULL)) {
    *waitp = 1; /* expect asynchronous response */
    return NULL;
  }

  failf(conn->data, "getaddrinfo() thread failed\n");

  return NULL;
}

#else /* !HAVE_GETADDRINFO */

/*
 * Curl_resolver_getaddrinfo() - for getaddrinfo
 */
Curl_addrinfo *Curl_resolver_getaddrinfo(struct connectdata *conn,
                                         const char *hostname,
                                         int port,
                                         int *waitp)
{
  struct addrinfo hints;
  char sbuf[12];
  int pf = PF_INET;
  struct Curl_easy *data = conn->data;
  struct resdata *reslv = (struct resdata *)data->state.resolver;

  *waitp = 0; /* default to synchronous response */

#ifndef USE_RESOLVE_ON_IPS
  {
    struct in_addr in;
    /* First check if this is an IPv4 address string */
    if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
      /* This is a dotted IP address 123.123.123.123-style */
      return Curl_ip2addr(AF_INET, &in, hostname, port);
  }
#ifdef CURLRES_IPV6
  {
    struct in6_addr in6;
    /* check if this is an IPv6 address string */
    if(Curl_inet_pton(AF_INET6, hostname, &in6) > 0)
      /* This is an IPv6 address literal */
      return Curl_ip2addr(AF_INET6, &in6, hostname, port);
  }
#endif /* CURLRES_IPV6 */
#endif /* !USE_RESOLVE_ON_IPS */

#ifdef CURLRES_IPV6
  /*
   * Check if a limited name resolve has been requested.
   */
  switch(conn->ip_version) {
  case CURL_IPRESOLVE_V4:
    pf = PF_INET;
    break;
  case CURL_IPRESOLVE_V6:
    pf = PF_INET6;
    break;
  default:
    pf = PF_UNSPEC;
    break;
  }

  if((pf != PF_INET) && !Curl_ipv6works())
    /* The stack seems to be a non-IPv6 one */
    pf = PF_INET;
#endif /* CURLRES_IPV6 */

  memset(&hints, 0, sizeof(hints));
  hints.ai_family = pf;
  hints.ai_socktype = conn->socktype;

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

  reslv->start = Curl_now();
  /* fire up a new resolver thread! */
  if(init_resolve_thread(conn, hostname, port, &hints)) {
    *waitp = 1; /* expect asynchronous response */
    return NULL;
  }

  failf(data, "getaddrinfo() thread failed to start\n");
  return NULL;

}

#endif /* !HAVE_GETADDRINFO */

CURLcode Curl_set_dns_servers(struct Curl_easy *data,
                              char *servers)
{
  (void)data;
  (void)servers;
  return CURLE_NOT_BUILT_IN;

}

CURLcode Curl_set_dns_interface(struct Curl_easy *data,
                                const char *interf)
{
  (void)data;
  (void)interf;
  return CURLE_NOT_BUILT_IN;
}

CURLcode Curl_set_dns_local_ip4(struct Curl_easy *data,
                                const char *local_ip4)
{
  (void)data;
  (void)local_ip4;
  return CURLE_NOT_BUILT_IN;
}

CURLcode Curl_set_dns_local_ip6(struct Curl_easy *data,
                                const char *local_ip6)
{
  (void)data;
  (void)local_ip6;
  return CURLE_NOT_BUILT_IN;
}

#endif /* CURLRES_THREADED */

1	/***************************************************************************
2	* _ _ ____ _
3	* Project ___\| \| \| \| _ \\| \|
4	* / __\| \| \| \| \|_) \| \|
5	* \| (__\| \|_\| \| _ <\| \|___
6	* \___\|\___/\|_\| \_\_____\|
7	*
8	* Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
9	*
10	* This software is licensed as described in the file COPYING, which
11	* you should have received as part of this distribution. The terms
12	* are also available at https://curl.haxx.se/docs/copyright.html.
13	*
14	* You may opt to use, copy, modify, merge, publish, distribute and/or sell
15	* copies of the Software, and permit persons to whom the Software is
16	* furnished to do so, under the terms of the COPYING file.
17	*
18	* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19	* KIND, either express or implied.
20	*
21	***************************************************************************/
22
23	#include "curl_setup.h"
24
25	/***********************************************************************
26	* Only for threaded name resolves builds
27	**********************************************************************/
28	#ifdef CURLRES_THREADED
29
30	#ifdef HAVE_NETINET_IN_H
31	#include <netinet/in.h>
32	#endif
33	#ifdef HAVE_NETDB_H
34	#include <netdb.h>
35	#endif
36	#ifdef HAVE_ARPA_INET_H
37	#include <arpa/inet.h>
38	#endif
39	#ifdef __VMS
40	#include <in.h>
41	#include <inet.h>
42	#endif
43
44	#if defined(USE_THREADS_POSIX)
45	# ifdef HAVE_PTHREAD_H
46	# include <pthread.h>
47	# endif
48	#elif defined(USE_THREADS_WIN32)
49	# ifdef HAVE_PROCESS_H
50	# include <process.h>
51	# endif
52	#endif
53
54	#if (defined(NETWARE) && defined(__NOVELL_LIBC__))
55	#undef in_addr_t
56	#define in_addr_t unsigned long
57	#endif
58
59	#ifdef HAVE_GETADDRINFO
60	# define RESOLVER_ENOMEM EAI_MEMORY
61	#else
62	# define RESOLVER_ENOMEM ENOMEM
63	#endif
64
65	#include "urldata.h"
66	#include "sendf.h"
67	#include "hostip.h"
68	#include "hash.h"
69	#include "share.h"
70	#include "strerror.h"
71	#include "url.h"
72	#include "multiif.h"
73	#include "inet_pton.h"
74	#include "inet_ntop.h"
75	#include "curl_threads.h"
76	#include "connect.h"
77	/* The last 3 #include files should be in this order */
78	#include "curl_printf.h"
79	#include "curl_memory.h"
80	#include "memdebug.h"
81
82	struct resdata {
83	struct curltime start;
84	};
85
86	/*
87	* Curl_resolver_global_init()
88	* Called from curl_global_init() to initialize global resolver environment.
89	* Does nothing here.
90	*/
91	int Curl_resolver_global_init(void)	6,972✔
92	{
93	return CURLE_OK;	6,972✔
94	}
95
96	/*
97	* Curl_resolver_global_cleanup()
98	* Called from curl_global_cleanup() to destroy global resolver environment.
99	* Does nothing here.
100	*/
101	void Curl_resolver_global_cleanup(void)	6,726✔
102	{
103	}	6,726✔
104
105	/*
106	* Curl_resolver_init()
107	* Called from curl_easy_init() -> Curl_open() to initialize resolver
108	* URL-state specific environment ('resolver' member of the UrlState
109	* structure).
110	*/
111	CURLcode Curl_resolver_init(void **resolver)	11,742✔
112	{
113	*resolver = calloc(1, sizeof(struct resdata));	11,742✔
114	if(!*resolver)	11,742✔
115	return CURLE_OUT_OF_MEMORY;	108✔
116	return CURLE_OK;	11,634✔
117	}
118
119	/*
120	* Curl_resolver_cleanup()
121	* Called from curl_easy_cleanup() -> Curl_close() to cleanup resolver
122	* URL-state specific environment ('resolver' member of the UrlState
123	* structure).
124	*/
125	void Curl_resolver_cleanup(void *resolver)	11,633✔
126	{
127	free(resolver);	11,633✔
128	}	11,633✔
129
130	/*
131	* Curl_resolver_duphandle()
132	* Called from curl_easy_duphandle() to duplicate resolver URL state-specific
133	* environment ('resolver' member of the UrlState structure).
134	*/
135	int Curl_resolver_duphandle(void *to, void from)	67✔
136	{
137	(void)from;
138	return Curl_resolver_init(to);	67✔
139	}
140
141	static void destroy_async_data(struct Curl_async *);
142
143	/*
144	* Cancel all possibly still on-going resolves for this connection.
145	*/
146	void Curl_resolver_cancel(struct connectdata *conn)	8,072✔
147	{
148	destroy_async_data(&conn->async);	8,072✔
149	}	8,072✔
150
151	/* This function is used to init a threaded resolve */
152	static bool init_resolve_thread(struct connectdata *conn,
153	const char *hostname, int port,
154	const struct addrinfo *hints);
155
156
157	/* Data for synchronization between resolver thread and its parent */
158	struct thread_sync_data {
159	curl_mutex_t * mtx;
160	int done;
161
162	char hostname; / hostname to resolve, Curl_async.hostname
163	duplicate */
164	int port;
165	int sock_error;
166	Curl_addrinfo *res;
167	#ifdef HAVE_GETADDRINFO
168	struct addrinfo hints;
169	#endif
170	struct thread_data td; / for thread-self cleanup */
171	};
172
173	struct thread_data {
174	curl_thread_t thread_hnd;
175	unsigned int poll_interval;
176	time_t interval_end;
177	struct thread_sync_data tsd;
178	};
179
180	static struct thread_sync_data conn_thread_sync_data(struct connectdata conn)	22✔
181	{
182	return &(((struct thread_data *)conn->async.os_specific)->tsd);	22✔
183	}
184
185	#define CONN_THREAD_SYNC_DATA(conn) &(((conn)->async.os_specific)->tsd);
186
187	/* Destroy resolver thread synchronization data */
188	static
189	void destroy_thread_sync_data(struct thread_sync_data * tsd)	27✔
190	{
191	if(tsd->mtx) {	27✔
192	Curl_mutex_destroy(tsd->mtx);	26✔
193	free(tsd->mtx);	26✔
194	}
195
196	free(tsd->hostname);	27✔
197
198	if(tsd->res)	27✔
199	Curl_freeaddrinfo(tsd->res);	×
200
201	memset(tsd, 0, sizeof(*tsd));	27✔
202	}	27✔
203
204	/* Initialize resolver thread synchronization data */
205	static
206	int init_thread_sync_data(struct thread_data * td,	27✔
207	const char *hostname,
208	int port,
209	const struct addrinfo *hints)
210	{
211	struct thread_sync_data *tsd = &td->tsd;	27✔
212
213	memset(tsd, 0, sizeof(*tsd));	27✔
214
215	tsd->td = td;	27✔
216	tsd->port = port;	27✔
217	/* Treat the request as done until the thread actually starts so any early
218	* cleanup gets done properly.
219	*/
220	tsd->done = 1;	27✔
221	#ifdef HAVE_GETADDRINFO
222	DEBUGASSERT(hints);	27✔
223	tsd->hints = *hints;	27✔
224	#else
225	(void) hints;
226	#endif
227
228	tsd->mtx = malloc(sizeof(curl_mutex_t));	27✔
229	if(tsd->mtx == NULL)	27✔
230	goto err_exit;	1✔
231
232	Curl_mutex_init(tsd->mtx);	26✔
233
234	tsd->sock_error = CURL_ASYNC_SUCCESS;	26✔
235
236	/* Copying hostname string because original can be destroyed by parent
237	* thread during gethostbyname execution.
238	*/
239	tsd->hostname = strdup(hostname);	26✔
240	if(!tsd->hostname)	26✔
241	goto err_exit;	1✔
242
243	return 1;	25✔
244
245	err_exit:	2✔
246	/* Memory allocation failed */
247	destroy_thread_sync_data(tsd);	2✔
248	return 0;	2✔
249	}
250
251	static int getaddrinfo_complete(struct connectdata *conn)	22✔
252	{
253	struct thread_sync_data *tsd = conn_thread_sync_data(conn);	22✔
254	int rc;
255
256	rc = Curl_addrinfo_callback(conn, tsd->sock_error, tsd->res);	22✔
257	/* The tsd->res structure has been copied to async.dns and perhaps the DNS
258	cache. Set our copy to NULL so destroy_thread_sync_data doesn't free it.
259	*/
260	tsd->res = NULL;	22✔
261
262	return rc;	22✔
263	}
264
265
266	#ifdef HAVE_GETADDRINFO
267
268	/*
269	* getaddrinfo_thread() resolves a name and then exits.
270	*
271	* For builds without ARES, but with ENABLE_IPV6, create a resolver thread
272	* and wait on it.
273	*/
274	static unsigned int CURL_STDCALL getaddrinfo_thread(void *arg)	22✔
275	{
276	struct thread_sync_data tsd = (struct thread_sync_data)arg;	22✔
277	struct thread_data *td = tsd->td;	22✔
278	char service[12];
279	int rc;
280
281	snprintf(service, sizeof(service), "%d", tsd->port);	22✔
282
283	rc = Curl_getaddrinfo_ex(tsd->hostname, service, &tsd->hints, &tsd->res);	22✔
284
285	if(rc != 0) {	22✔
286	tsd->sock_error = SOCKERRNO?SOCKERRNO:rc;	8✔
287	if(tsd->sock_error == 0)	8✔
288	tsd->sock_error = RESOLVER_ENOMEM;	×
289	}
290	else {
291	Curl_addrinfo_set_port(tsd->res, tsd->port);
292	}
293
294	Curl_mutex_acquire(tsd->mtx);	22✔
295	if(tsd->done) {	22✔
296	/* too late, gotta clean up the mess */
297	Curl_mutex_release(tsd->mtx);	×
298	destroy_thread_sync_data(tsd);	×
299	free(td);	×
300	}
301	else {
302	tsd->done = 1;	22✔
303	Curl_mutex_release(tsd->mtx);	22✔
304	}
305
306	return 0;	22✔
307	}
308
309	#else /* HAVE_GETADDRINFO */
310
311	/*
312	* gethostbyname_thread() resolves a name and then exits.
313	*/
314	static unsigned int CURL_STDCALL gethostbyname_thread(void *arg)
315	{
316	struct thread_sync_data tsd = (struct thread_sync_data )arg;
317	struct thread_data *td = tsd->td;
318
319	tsd->res = Curl_ipv4_resolve_r(tsd->hostname, tsd->port);
320
321	if(!tsd->res) {
322	tsd->sock_error = SOCKERRNO;
323	if(tsd->sock_error == 0)
324	tsd->sock_error = RESOLVER_ENOMEM;
325	}
326
327	Curl_mutex_acquire(tsd->mtx);
328	if(tsd->done) {
329	/* too late, gotta clean up the mess */
330	Curl_mutex_release(tsd->mtx);
331	destroy_thread_sync_data(tsd);
332	free(td);
333	}
334	else {
335	tsd->done = 1;
336	Curl_mutex_release(tsd->mtx);
337	}
338
339	return 0;
340	}
341
342	#endif /* HAVE_GETADDRINFO */
343
344	/*
345	* destroy_async_data() cleans up async resolver data and thread handle.
346	*/
347	static void destroy_async_data(struct Curl_async *async)	8,097✔
348	{
349	if(async->os_specific) {	8,097✔
350	struct thread_data td = (struct thread_data) async->os_specific;	25✔
351	int done;
352
353	/*
354	* if the thread is still blocking in the resolve syscall, detach it and
355	* let the thread do the cleanup...
356	*/
357	Curl_mutex_acquire(td->tsd.mtx);	25✔
358	done = td->tsd.done;	25✔
359	td->tsd.done = 1;	25✔
360	Curl_mutex_release(td->tsd.mtx);	25✔
361
362	if(!done) {	25✔
363	Curl_thread_destroy(td->thread_hnd);	×
364	}
365	else {
366	if(td->thread_hnd != curl_thread_t_null)	25✔
367	Curl_thread_join(&td->thread_hnd);	19✔
368
369	destroy_thread_sync_data(&td->tsd);	25✔
370
371	free(async->os_specific);	25✔
372	}
373	}
374	async->os_specific = NULL;	8,097✔
375
376	free(async->hostname);	8,097✔
377	async->hostname = NULL;	8,097✔
378	}	8,097✔
379
380	/*
381	* init_resolve_thread() starts a new thread that performs the actual
382	* resolve. This function returns before the resolve is done.
383	*
384	* Returns FALSE in case of failure, otherwise TRUE.
385	*/
386	static bool init_resolve_thread(struct connectdata *conn,	31✔
387	const char *hostname, int port,
388	const struct addrinfo *hints)
389	{
390	struct thread_data *td = calloc(1, sizeof(struct thread_data));	31✔
391	int err = ENOMEM;	31✔
392
393	conn->async.os_specific = (void *)td;	31✔
394	if(!td)	31✔
395	goto errno_exit;	4✔
396
397	conn->async.port = port;	27✔
398	conn->async.done = FALSE;	27✔
399	conn->async.status = 0;	27✔
400	conn->async.dns = NULL;	27✔
401	td->thread_hnd = curl_thread_t_null;	27✔
402
403	if(!init_thread_sync_data(td, hostname, port, hints)) {	27✔
404	conn->async.os_specific = NULL;	2✔
405	free(td);	2✔
406	goto errno_exit;	2✔
407	}
408
409	free(conn->async.hostname);	25✔
410	conn->async.hostname = strdup(hostname);	25✔
411	if(!conn->async.hostname)	25✔
412	goto err_exit;	1✔
413
414	/* The thread will set this to 1 when complete. */
415	td->tsd.done = 0;	24✔
416
417	#ifdef HAVE_GETADDRINFO
418	td->thread_hnd = Curl_thread_create(getaddrinfo_thread, &td->tsd);	24✔
419	#else
420	td->thread_hnd = Curl_thread_create(gethostbyname_thread, &td->tsd);
421	#endif
422
423	if(!td->thread_hnd) {	24✔
424	/* The thread never started, so mark it as done here for proper cleanup. */
425	td->tsd.done = 1;	2✔
426	err = errno;	2✔
427	goto err_exit;	2✔
428	}
429
430	return TRUE;	22✔
431
432	err_exit:	3✔
433	destroy_async_data(&conn->async);	3✔
434
435	errno_exit:	9✔
436	errno = err;	9✔
437	return FALSE;	9✔
438	}
439
440	/*
441	* resolver_error() calls failf() with the appropriate message after a resolve
442	* error
443	*/
444
445	static CURLcode resolver_error(struct connectdata *conn)	8✔
446	{
447	const char *host_or_proxy;
448	CURLcode result;
449
450	if(conn->bits.httpproxy) {	8✔
451	host_or_proxy = "proxy";	×
452	result = CURLE_COULDNT_RESOLVE_PROXY;	×
453	}
454	else {
455	host_or_proxy = "host";	8✔
456	result = CURLE_COULDNT_RESOLVE_HOST;	8✔
457	}
458
459	failf(conn->data, "Could not resolve %s: %s", host_or_proxy,	8✔
460	conn->async.hostname);
461
462	return result;	8✔
463	}
464
465	/*
466	* Curl_resolver_wait_resolv()
467	*
468	* waits for a resolve to finish. This function should be avoided since using
469	* this risk getting the multi interface to "hang".
470	*
471	* If 'entry' is non-NULL, make it point to the resolved dns entry
472	*
473	* This is the version for resolves-in-a-thread.
474	*/
475	CURLcode Curl_resolver_wait_resolv(struct connectdata *conn,	3✔
476	struct Curl_dns_entry **entry)
477	{
478	struct thread_data td = (struct thread_data) conn->async.os_specific;	3✔
479	CURLcode result = CURLE_OK;	3✔
480
481	DEBUGASSERT(conn && td);	3✔
482
483	/* wait for the thread to resolve the name */
484	if(Curl_thread_join(&td->thread_hnd))	3✔
485	result = getaddrinfo_complete(conn);	3✔
486	else
487	DEBUGASSERT(0);	×
488
489	conn->async.done = TRUE;	3✔
490
491	if(entry)	3✔
492	*entry = conn->async.dns;	3✔
493
494	if(!conn->async.dns)	3✔
495	/* a name was not resolved, report error */
496	result = resolver_error(conn);	2✔
497
498	destroy_async_data(&conn->async);	3✔
499
500	if(!conn->async.dns)	3✔
501	connclose(conn, "asynch resolve failed");	2✔
502
503	return result;	3✔
504	}
505
506	/*
507	* Curl_resolver_is_resolved() is called repeatedly to check if a previous
508	* name resolve request has completed. It should also make sure to time-out if
509	* the operation seems to take too long.
510	*/
511	CURLcode Curl_resolver_is_resolved(struct connectdata *conn,	52✔
512	struct Curl_dns_entry **entry)
513	{
514	struct Curl_easy *data = conn->data;	52✔
515	struct thread_data td = (struct thread_data) conn->async.os_specific;	52✔
516	int done = 0;	52✔
517
518	*entry = NULL;	52✔
519
520	if(!td) {	52✔
521	DEBUGASSERT(td);	×
522	return CURLE_COULDNT_RESOLVE_HOST;	×
523	}
524
525	Curl_mutex_acquire(td->tsd.mtx);	52✔
526	done = td->tsd.done;	52✔
527	Curl_mutex_release(td->tsd.mtx);	52✔
528
529	if(done) {	52✔
530	getaddrinfo_complete(conn);	19✔
531
532	if(!conn->async.dns) {	19✔
533	CURLcode result = resolver_error(conn);	6✔
534	destroy_async_data(&conn->async);	6✔
535	return result;	6✔
536	}
537	destroy_async_data(&conn->async);	13✔
538	*entry = conn->async.dns;	13✔
539	}
540	else {
541	/* poll for name lookup done with exponential backoff up to 250ms */
542	timediff_t elapsed = Curl_timediff(Curl_now(),	33✔
543	data->progress.t_startsingle);
544	if(elapsed < 0)	33✔
545	elapsed = 0;	×
546
547	if(td->poll_interval == 0)	33✔
548	/* Start at 1ms poll interval */
549	td->poll_interval = 1;	22✔
550	else if(elapsed >= td->interval_end)	11✔
551	/* Back-off exponentially if last interval expired */
552	td->poll_interval *= 2;	2✔
553
554	if(td->poll_interval > 250)	33✔
555	td->poll_interval = 250;	×
556
557	td->interval_end = elapsed + td->poll_interval;	33✔
558	Curl_expire(conn->data, td->poll_interval, EXPIRE_ASYNC_NAME);	33✔
559	}
560
561	return CURLE_OK;	46✔
562	}
563
564	int Curl_resolver_getsock(struct connectdata *conn,	60✔
565	curl_socket_t *socks,
566	int numsocks)
567	{
568	time_t milli;
569	timediff_t ms;
570	struct Curl_easy *data = conn->data;	60✔
571	struct resdata reslv = (struct resdata )data->state.resolver;	60✔
572	(void)socks;
573	(void)numsocks;
574	ms = Curl_timediff(Curl_now(), reslv->start);	60✔
575	if(ms < 10)	60✔
576	milli = ms/3;	52✔
577	else if(ms <= 50)	8✔
578	milli = 10;	3✔
579	else if(ms <= 250)	5✔
580	milli = 50;	×
581	else
582	milli = 200;	5✔
583	Curl_expire(data, milli, EXPIRE_ASYNC_NAME);	60✔
584	return 0;	60✔
585	}
586
587	#ifndef HAVE_GETADDRINFO
588	/*
589	* Curl_getaddrinfo() - for platforms without getaddrinfo
590	*/
591	Curl_addrinfo Curl_resolver_getaddrinfo(struct connectdata conn,
592	const char *hostname,
593	int port,
594	int *waitp)
595	{
596	struct in_addr in;
597	struct Curl_easy *data = conn->data;
598	struct resdata reslv = (struct resdata )data->state.resolver;
599
600	waitp = 0; / default to synchronous response */
601
602	if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
603	/* This is a dotted IP address 123.123.123.123-style */
604	return Curl_ip2addr(AF_INET, &in, hostname, port);
605
606	reslv->start = Curl_now();
607
608	/* fire up a new resolver thread! */
609	if(init_resolve_thread(conn, hostname, port, NULL)) {
610	waitp = 1; / expect asynchronous response */
611	return NULL;
612	}
613
614	failf(conn->data, "getaddrinfo() thread failed\n");
615
616	return NULL;
617	}
618
619	#else /* !HAVE_GETADDRINFO */
620
621	/*
622	* Curl_resolver_getaddrinfo() - for getaddrinfo
623	*/
624	Curl_addrinfo Curl_resolver_getaddrinfo(struct connectdata conn,	3,746✔
625	const char *hostname,
626	int port,
627	int *waitp)
628	{
629	struct addrinfo hints;
630	char sbuf[12];
631	int pf = PF_INET;	3,746✔
632	struct Curl_easy *data = conn->data;	3,746✔
633	struct resdata reslv = (struct resdata )data->state.resolver;	3,746✔
634
635	waitp = 0; / default to synchronous response */	3,746✔
636
637	#ifndef USE_RESOLVE_ON_IPS
638	{
639	struct in_addr in;
640	/* First check if this is an IPv4 address string */
641	if(Curl_inet_pton(AF_INET, hostname, &in) > 0)	3,746✔
642	/* This is a dotted IP address 123.123.123.123-style */
643	return Curl_ip2addr(AF_INET, &in, hostname, port);	3,624✔
644	}
645	#ifdef CURLRES_IPV6
646	{
647	struct in6_addr in6;
648	/* check if this is an IPv6 address string */
649	if(Curl_inet_pton(AF_INET6, hostname, &in6) > 0)	122✔
650	/* This is an IPv6 address literal */
651	return Curl_ip2addr(AF_INET6, &in6, hostname, port);	91✔
652	}
653	#endif /* CURLRES_IPV6 */
654	#endif /* !USE_RESOLVE_ON_IPS */
655
656	#ifdef CURLRES_IPV6
657	/*
658	* Check if a limited name resolve has been requested.
659	*/
660	switch(conn->ip_version) {	31✔
661	case CURL_IPRESOLVE_V4:	2✔
662	pf = PF_INET;	2✔
663	break;	2✔
664	case CURL_IPRESOLVE_V6:	1✔
665	pf = PF_INET6;	1✔
666	break;	1✔
667	default:	28✔
668	pf = PF_UNSPEC;	28✔
669	break;	28✔
670	}
671
672	if((pf != PF_INET) && !Curl_ipv6works())	31✔
673	/* The stack seems to be a non-IPv6 one */
674	pf = PF_INET;	×
675	#endif /* CURLRES_IPV6 */
676
677	memset(&hints, 0, sizeof(hints));	31✔
678	hints.ai_family = pf;	31✔
679	hints.ai_socktype = conn->socktype;	31✔
680
681	snprintf(sbuf, sizeof(sbuf), "%d", port);	31✔
682
683	reslv->start = Curl_now();	31✔
684	/* fire up a new resolver thread! */
685	if(init_resolve_thread(conn, hostname, port, &hints)) {	31✔
686	waitp = 1; / expect asynchronous response */	22✔
687	return NULL;	22✔
688	}
689
690	failf(data, "getaddrinfo() thread failed to start\n");	9✔
691	return NULL;	9✔
692
693	}
694
695	#endif /* !HAVE_GETADDRINFO */
696
697	CURLcode Curl_set_dns_servers(struct Curl_easy *data,	2✔
698	char *servers)
699	{
700	(void)data;
701	(void)servers;
702	return CURLE_NOT_BUILT_IN;	2✔
703
704	}
705
706	CURLcode Curl_set_dns_interface(struct Curl_easy *data,	2✔
707	const char *interf)
708	{
709	(void)data;
710	(void)interf;
711	return CURLE_NOT_BUILT_IN;	2✔
712	}
713
714	CURLcode Curl_set_dns_local_ip4(struct Curl_easy *data,	2✔
715	const char *local_ip4)
716	{
717	(void)data;
718	(void)local_ip4;
719	return CURLE_NOT_BUILT_IN;	2✔
720	}
721
722	CURLcode Curl_set_dns_local_ip6(struct Curl_easy *data,	2✔
723	const char *local_ip6)
724	{
725	(void)data;
726	(void)local_ip6;
727	return CURLE_NOT_BUILT_IN;	2✔
728	}
729
730	#endif /* CURLRES_THREADED */

curl / curl / 7957

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