mirror of
https://github.com/moparisthebest/curl
synced 2024-11-02 08:35:03 -04:00
0cd8840dba
edited it slightly. Now you should be able to use IPv6 addresses fine even with libcurl built to use c-ares.
749 lines
20 KiB
C
749 lines
20 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* $Id$
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***************************************************************************/
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#include "setup.h"
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#include <string.h>
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#ifdef NEED_MALLOC_H
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#include <malloc.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_NETDB_H
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#include <netdb.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h> /* required for free() prototypes */
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h> /* for the close() proto */
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#endif
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#ifdef VMS
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#include <in.h>
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#include <inet.h>
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#include <stdlib.h>
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#endif
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#ifdef HAVE_SETJMP_H
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#include <setjmp.h>
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#endif
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#ifdef HAVE_PROCESS_H
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#include <process.h>
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#endif
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#include "urldata.h"
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#include "sendf.h"
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#include "hostip.h"
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#include "hash.h"
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#include "share.h"
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#include "strerror.h"
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#include "url.h"
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#include "inet_ntop.h"
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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#if defined(HAVE_INET_NTOA_R) && !defined(HAVE_INET_NTOA_R_DECL)
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#include "inet_ntoa_r.h"
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#endif
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#include "memory.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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/*
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* hostip.c explained
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* ==================
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*
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* The main COMPILE-TIME DEFINES to keep in mind when reading the host*.c
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* source file are these:
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*
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* CURLRES_IPV6 - this host has getaddrinfo() and family, and thus we use
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* that. The host may not be able to resolve IPv6, but we don't really have to
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* take that into account. Hosts that aren't IPv6-enabled have CURLRES_IPV4
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* defined.
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*
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* CURLRES_ARES - is defined if libcurl is built to use c-ares for
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* asynchronous name resolves. This can be Windows or *nix.
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*
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* CURLRES_THREADED - is defined if libcurl is built to run under (native)
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* Windows, and then the name resolve will be done in a new thread, and the
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* supported API will be the same as for ares-builds.
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*
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* If any of the two previous are defined, CURLRES_ASYNCH is defined too. If
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* libcurl is not built to use an asynchronous resolver, CURLRES_SYNCH is
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* defined.
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*
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* The host*.c sources files are split up like this:
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*
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* hostip.c - method-independent resolver functions and utility functions
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* hostasyn.c - functions for asynchronous name resolves
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* hostsyn.c - functions for synchronous name resolves
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* hostares.c - functions for ares-using name resolves
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* hostthre.c - functions for threaded name resolves
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* hostip4.c - ipv4-specific functions
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* hostip6.c - ipv6-specific functions
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*
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* The hostip.h is the united header file for all this. It defines the
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* CURLRES_* defines based on the config*.h and setup.h defines.
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*/
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/* These two symbols are for the global DNS cache */
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static struct curl_hash hostname_cache;
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static int host_cache_initialized;
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static void freednsentry(void *freethis);
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/*
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* Curl_global_host_cache_init() initializes and sets up a global DNS cache.
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* Global DNS cache is general badness. Do not use. This will be removed in
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* a future version. Use the share interface instead!
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*
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* Returns a struct curl_hash pointer on success, NULL on failure.
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*/
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struct curl_hash *Curl_global_host_cache_init(void)
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{
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int rc = 0;
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if(!host_cache_initialized) {
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rc = Curl_hash_init(&hostname_cache, 7, Curl_hash_str,
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Curl_str_key_compare, freednsentry);
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if(!rc)
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host_cache_initialized = 1;
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}
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return rc?NULL:&hostname_cache;
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}
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/*
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* Destroy and cleanup the global DNS cache
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*/
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void Curl_global_host_cache_dtor(void)
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{
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if(host_cache_initialized) {
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Curl_hash_clean(&hostname_cache);
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host_cache_initialized = 0;
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}
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}
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/*
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* Return # of adresses in a Curl_addrinfo struct
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*/
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int Curl_num_addresses(const Curl_addrinfo *addr)
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{
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int i;
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for (i = 0; addr; addr = addr->ai_next, i++)
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; /* empty loop */
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return i;
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}
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/*
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* Curl_printable_address() returns a printable version of the 1st address
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* given in the 'ip' argument. The result will be stored in the buf that is
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* bufsize bytes big.
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*
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* If the conversion fails, it returns NULL.
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*/
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const char *Curl_printable_address(const Curl_addrinfo *ip,
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char *buf, size_t bufsize)
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{
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const void *ip4 = &((const struct sockaddr_in*)ip->ai_addr)->sin_addr;
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int af = ip->ai_family;
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#ifdef CURLRES_IPV6
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const void *ip6 = &((const struct sockaddr_in6*)ip->ai_addr)->sin6_addr;
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#else
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const void *ip6 = NULL;
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#endif
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return Curl_inet_ntop(af, af == AF_INET ? ip4 : ip6, buf, bufsize);
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}
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/*
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* Return a hostcache id string for the providing host + port, to be used by
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* the DNS caching.
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*/
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static char *
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create_hostcache_id(const char *server, int port)
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{
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/* create and return the new allocated entry */
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return aprintf("%s:%d", server, port);
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}
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struct hostcache_prune_data {
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long cache_timeout;
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time_t now;
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};
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/*
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* This function is set as a callback to be called for every entry in the DNS
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* cache when we want to prune old unused entries.
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*
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* Returning non-zero means remove the entry, return 0 to keep it in the
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* cache.
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*/
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static int
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hostcache_timestamp_remove(void *datap, void *hc)
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{
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struct hostcache_prune_data *data =
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(struct hostcache_prune_data *) datap;
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struct Curl_dns_entry *c = (struct Curl_dns_entry *) hc;
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if((data->now - c->timestamp < data->cache_timeout) ||
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c->inuse) {
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/* please don't remove */
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return 0;
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}
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/* fine, remove */
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return 1;
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}
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/*
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* Prune the DNS cache. This assumes that a lock has already been taken.
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*/
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static void
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hostcache_prune(struct curl_hash *hostcache, long cache_timeout, time_t now)
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{
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struct hostcache_prune_data user;
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user.cache_timeout = cache_timeout;
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user.now = now;
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Curl_hash_clean_with_criterium(hostcache,
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(void *) &user,
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hostcache_timestamp_remove);
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}
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/*
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* Library-wide function for pruning the DNS cache. This function takes and
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* returns the appropriate locks.
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*/
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void Curl_hostcache_prune(struct SessionHandle *data)
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{
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time_t now;
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if((data->set.dns_cache_timeout == -1) || !data->dns.hostcache)
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/* cache forever means never prune, and NULL hostcache means
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we can't do it */
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return;
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if(data->share)
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Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
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time(&now);
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/* Remove outdated and unused entries from the hostcache */
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hostcache_prune(data->dns.hostcache,
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data->set.dns_cache_timeout,
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now);
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if(data->share)
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Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
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}
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/*
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* Check if the entry should be pruned. Assumes a locked cache.
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*/
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static int
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remove_entry_if_stale(struct SessionHandle *data, struct Curl_dns_entry *dns)
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{
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struct hostcache_prune_data user;
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if( !dns || (data->set.dns_cache_timeout == -1) || !data->dns.hostcache)
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/* cache forever means never prune, and NULL hostcache means
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we can't do it */
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return 0;
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time(&user.now);
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user.cache_timeout = data->set.dns_cache_timeout;
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if( !hostcache_timestamp_remove(&user,dns) )
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return 0;
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Curl_hash_clean_with_criterium(data->dns.hostcache,
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(void *) &user,
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hostcache_timestamp_remove);
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return 1;
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}
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#ifdef HAVE_SIGSETJMP
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/* Beware this is a global and unique instance. This is used to store the
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return address that we can jump back to from inside a signal handler. This
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is not thread-safe stuff. */
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sigjmp_buf curl_jmpenv;
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#endif
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/*
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* Curl_cache_addr() stores a 'Curl_addrinfo' struct in the DNS cache.
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*
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* When calling Curl_resolv() has resulted in a response with a returned
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* address, we call this function to store the information in the dns
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* cache etc
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*
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* Returns the Curl_dns_entry entry pointer or NULL if the storage failed.
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*/
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struct Curl_dns_entry *
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Curl_cache_addr(struct SessionHandle *data,
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Curl_addrinfo *addr,
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const char *hostname,
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int port)
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{
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char *entry_id;
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size_t entry_len;
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struct Curl_dns_entry *dns;
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struct Curl_dns_entry *dns2;
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time_t now;
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/* Create an entry id, based upon the hostname and port */
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entry_id = create_hostcache_id(hostname, port);
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/* If we can't create the entry id, fail */
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if(!entry_id)
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return NULL;
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entry_len = strlen(entry_id);
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/* Create a new cache entry */
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dns = (struct Curl_dns_entry *) calloc(sizeof(struct Curl_dns_entry), 1);
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if(!dns) {
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free(entry_id);
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return NULL;
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}
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dns->inuse = 0; /* init to not used */
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dns->addr = addr; /* this is the address(es) */
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/* Store the resolved data in our DNS cache. This function may return a
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pointer to an existing struct already present in the hash, and it may
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return the same argument we pass in. Make no assumptions. */
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dns2 = Curl_hash_add(data->dns.hostcache, entry_id, entry_len+1,
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(void *)dns);
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if(!dns2) {
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/* Major badness, run away. */
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free(dns);
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free(entry_id);
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return NULL;
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}
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time(&now);
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dns = dns2;
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dns->timestamp = now; /* used now */
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dns->inuse++; /* mark entry as in-use */
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/* free the allocated entry_id again */
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free(entry_id);
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return dns;
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}
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/*
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* Curl_resolv() is the main name resolve function within libcurl. It resolves
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* a name and returns a pointer to the entry in the 'entry' argument (if one
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* is provided). This function might return immediately if we're using asynch
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* resolves. See the return codes.
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*
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* The cache entry we return will get its 'inuse' counter increased when this
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* function is used. You MUST call Curl_resolv_unlock() later (when you're
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* done using this struct) to decrease the counter again.
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*
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* Return codes:
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*
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* CURLRESOLV_ERROR (-1) = error, no pointer
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* CURLRESOLV_RESOLVED (0) = OK, pointer provided
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* CURLRESOLV_PENDING (1) = waiting for response, no pointer
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*/
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int Curl_resolv(struct connectdata *conn,
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const char *hostname,
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int port,
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struct Curl_dns_entry **entry)
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{
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char *entry_id = NULL;
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struct Curl_dns_entry *dns = NULL;
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size_t entry_len;
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struct SessionHandle *data = conn->data;
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CURLcode result;
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int rc = CURLRESOLV_ERROR; /* default to failure */
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*entry = NULL;
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#ifdef HAVE_SIGSETJMP
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/* this allows us to time-out from the name resolver, as the timeout
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will generate a signal and we will siglongjmp() from that here */
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if(!data->set.no_signal) {
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if(sigsetjmp(curl_jmpenv, 1)) {
|
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/* this is coming from a siglongjmp() */
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failf(data, "name lookup timed out");
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return rc;
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}
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}
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#endif
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/* Create an entry id, based upon the hostname and port */
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entry_id = create_hostcache_id(hostname, port);
|
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/* If we can't create the entry id, fail */
|
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if(!entry_id)
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return rc;
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entry_len = strlen(entry_id);
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if(data->share)
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Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
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/* See if its already in our dns cache */
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dns = Curl_hash_pick(data->dns.hostcache, entry_id, entry_len+1);
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|
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/* See whether the returned entry is stale. Done before we release lock */
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if( remove_entry_if_stale(data, dns) )
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dns = NULL; /* the memory deallocation is being handled by the hash */
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|
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if(dns) {
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dns->inuse++; /* we use it! */
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rc = CURLRESOLV_RESOLVED;
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}
|
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|
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if(data->share)
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Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
|
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|
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/* free the allocated entry_id again */
|
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free(entry_id);
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if(!dns) {
|
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/* The entry was not in the cache. Resolve it to IP address */
|
|
|
|
Curl_addrinfo *addr;
|
|
int respwait;
|
|
|
|
/* Check what IP specifics the app has requested and if we can provide it.
|
|
* If not, bail out. */
|
|
if(!Curl_ipvalid(data))
|
|
return CURLRESOLV_ERROR;
|
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|
|
/* If Curl_getaddrinfo() returns NULL, 'respwait' might be set to a
|
|
non-zero value indicating that we need to wait for the response to the
|
|
resolve call */
|
|
addr = Curl_getaddrinfo(conn, hostname, port, &respwait);
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|
|
|
if(!addr) {
|
|
if(respwait) {
|
|
/* the response to our resolve call will come asynchronously at
|
|
a later time, good or bad */
|
|
/* First, check that we haven't received the info by now */
|
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result = Curl_is_resolved(conn, &dns);
|
|
if(result) /* error detected */
|
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return CURLRESOLV_ERROR;
|
|
if(dns)
|
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rc = CURLRESOLV_RESOLVED; /* pointer provided */
|
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else
|
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rc = CURLRESOLV_PENDING; /* no info yet */
|
|
}
|
|
}
|
|
else {
|
|
if(data->share)
|
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Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
|
|
|
|
/* we got a response, store it in the cache */
|
|
dns = Curl_cache_addr(data, addr, hostname, port);
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|
|
if(data->share)
|
|
Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
|
|
|
|
if(!dns)
|
|
/* returned failure, bail out nicely */
|
|
Curl_freeaddrinfo(addr);
|
|
else
|
|
rc = CURLRESOLV_RESOLVED;
|
|
}
|
|
}
|
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|
|
*entry = dns;
|
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|
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return rc;
|
|
}
|
|
|
|
/*
|
|
* Curl_resolv_unlock() unlocks the given cached DNS entry. When this has been
|
|
* made, the struct may be destroyed due to pruning. It is important that only
|
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* one unlock is made for each Curl_resolv() call.
|
|
*/
|
|
void Curl_resolv_unlock(struct SessionHandle *data, struct Curl_dns_entry *dns)
|
|
{
|
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DEBUGASSERT(dns && (dns->inuse>0));
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|
|
if(data->share)
|
|
Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
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|
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dns->inuse--;
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|
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if(data->share)
|
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Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
|
|
}
|
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|
|
/*
|
|
* File-internal: free a cache dns entry.
|
|
*/
|
|
static void freednsentry(void *freethis)
|
|
{
|
|
struct Curl_dns_entry *p = (struct Curl_dns_entry *) freethis;
|
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|
|
Curl_freeaddrinfo(p->addr);
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|
|
free(p);
|
|
}
|
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|
|
/*
|
|
* Curl_mk_dnscache() creates a new DNS cache and returns the handle for it.
|
|
*/
|
|
struct curl_hash *Curl_mk_dnscache(void)
|
|
{
|
|
return Curl_hash_alloc(7, Curl_hash_str, Curl_str_key_compare, freednsentry);
|
|
}
|
|
|
|
#ifdef CURLRES_ADDRINFO_COPY
|
|
|
|
/* align on even 64bit boundaries */
|
|
#define MEMALIGN(x) ((x)+(8-(((unsigned long)(x))&0x7)))
|
|
|
|
/*
|
|
* Curl_addrinfo_copy() performs a "deep" copy of a hostent into a buffer and
|
|
* returns a pointer to the malloc()ed copy. You need to call free() on the
|
|
* returned buffer when you're done with it.
|
|
*/
|
|
Curl_addrinfo *Curl_addrinfo_copy(const void *org, int port)
|
|
{
|
|
const struct hostent *orig = org;
|
|
|
|
return Curl_he2ai(orig, port);
|
|
}
|
|
#endif /* CURLRES_ADDRINFO_COPY */
|
|
|
|
/***********************************************************************
|
|
* Only for plain-ipv4 and c-ares builds (NOTE: c-ares builds can be IPv6
|
|
* enabled)
|
|
**********************************************************************/
|
|
|
|
#if defined(CURLRES_IPV4) || defined(CURLRES_ARES)
|
|
/*
|
|
* This is a function for freeing name information in a protocol independent
|
|
* way.
|
|
*/
|
|
void Curl_freeaddrinfo(Curl_addrinfo *ai)
|
|
{
|
|
Curl_addrinfo *next;
|
|
|
|
/* walk over the list and free all entries */
|
|
while(ai) {
|
|
next = ai->ai_next;
|
|
if(ai->ai_canonname)
|
|
free(ai->ai_canonname);
|
|
free(ai);
|
|
ai = next;
|
|
}
|
|
}
|
|
|
|
struct namebuf {
|
|
struct hostent hostentry;
|
|
char *h_addr_list[2];
|
|
struct in_addr addrentry;
|
|
char h_name[16]; /* 123.123.123.123 = 15 letters is maximum */
|
|
};
|
|
|
|
/*
|
|
* Curl_ip2addr() takes a 32bit ipv4 internet address as input parameter
|
|
* together with a pointer to the string version of the address, and it
|
|
* returns a Curl_addrinfo chain filled in correctly with information for this
|
|
* address/host.
|
|
*
|
|
* The input parameters ARE NOT checked for validity but they are expected
|
|
* to have been checked already when this is called.
|
|
*/
|
|
Curl_addrinfo *Curl_ip2addr(in_addr_t num, const char *hostname, int port)
|
|
{
|
|
Curl_addrinfo *ai;
|
|
|
|
#if defined(VMS) && \
|
|
defined(__INITIAL_POINTER_SIZE) && (__INITIAL_POINTER_SIZE == 64)
|
|
#pragma pointer_size save
|
|
#pragma pointer_size short
|
|
#pragma message disable PTRMISMATCH
|
|
#endif
|
|
|
|
struct hostent *h;
|
|
struct in_addr *addrentry;
|
|
struct namebuf buffer;
|
|
struct namebuf *buf = &buffer;
|
|
|
|
h = &buf->hostentry;
|
|
h->h_addr_list = &buf->h_addr_list[0];
|
|
addrentry = &buf->addrentry;
|
|
#ifdef _CRAYC
|
|
/* On UNICOS, s_addr is a bit field and for some reason assigning to it
|
|
* doesn't work. There must be a better fix than this ugly hack.
|
|
*/
|
|
memcpy(addrentry, &num, SIZEOF_in_addr);
|
|
#else
|
|
addrentry->s_addr = num;
|
|
#endif
|
|
h->h_addr_list[0] = (char*)addrentry;
|
|
h->h_addr_list[1] = NULL;
|
|
h->h_addrtype = AF_INET;
|
|
h->h_length = sizeof(*addrentry);
|
|
h->h_name = &buf->h_name[0];
|
|
h->h_aliases = NULL;
|
|
|
|
/* Now store the dotted version of the address */
|
|
snprintf((char *)h->h_name, 16, "%s", hostname);
|
|
|
|
#if defined(VMS) && \
|
|
defined(__INITIAL_POINTER_SIZE) && (__INITIAL_POINTER_SIZE == 64)
|
|
#pragma pointer_size restore
|
|
#pragma message enable PTRMISMATCH
|
|
#endif
|
|
|
|
ai = Curl_he2ai(h, port);
|
|
|
|
return ai;
|
|
}
|
|
|
|
/*
|
|
* Curl_he2ai() translates from a hostent struct to a Curl_addrinfo struct.
|
|
* The Curl_addrinfo is meant to work like the addrinfo struct does for IPv6
|
|
* stacks, but for all hosts and environments.
|
|
*
|
|
* Curl_addrinfo defined in "lib/hostip.h"
|
|
*
|
|
* struct Curl_addrinfo {
|
|
* int ai_flags;
|
|
* int ai_family;
|
|
* int ai_socktype;
|
|
* int ai_protocol;
|
|
* socklen_t ai_addrlen; * Follow rfc3493 struct addrinfo *
|
|
* char *ai_canonname;
|
|
* struct sockaddr *ai_addr;
|
|
* struct Curl_addrinfo *ai_next;
|
|
* };
|
|
*
|
|
* hostent defined in <netdb.h>
|
|
*
|
|
* struct hostent {
|
|
* char *h_name;
|
|
* char **h_aliases;
|
|
* int h_addrtype;
|
|
* int h_length;
|
|
* char **h_addr_list;
|
|
* };
|
|
*
|
|
* for backward compatibility:
|
|
*
|
|
* #define h_addr h_addr_list[0]
|
|
*/
|
|
|
|
Curl_addrinfo *Curl_he2ai(const struct hostent *he, int port)
|
|
{
|
|
Curl_addrinfo *ai;
|
|
Curl_addrinfo *prevai = NULL;
|
|
Curl_addrinfo *firstai = NULL;
|
|
struct sockaddr_in *addr;
|
|
#ifdef CURLRES_IPV6
|
|
struct sockaddr_in6 *addr6;
|
|
#endif /* CURLRES_IPV6 */
|
|
int i;
|
|
struct in_addr *curr;
|
|
|
|
if(!he)
|
|
/* no input == no output! */
|
|
return NULL;
|
|
|
|
for(i=0; (curr = (struct in_addr *)he->h_addr_list[i]) != NULL; i++) {
|
|
|
|
int ss_size;
|
|
#ifdef CURLRES_IPV6
|
|
if (he->h_addrtype == AF_INET6)
|
|
ss_size = sizeof (struct sockaddr_in6);
|
|
else
|
|
#endif /* CURLRES_IPV6 */
|
|
ss_size = sizeof (struct sockaddr_in);
|
|
|
|
ai = calloc(1, sizeof(Curl_addrinfo) + ss_size);
|
|
|
|
if(!ai)
|
|
break;
|
|
|
|
if(!firstai)
|
|
/* store the pointer we want to return from this function */
|
|
firstai = ai;
|
|
|
|
if(prevai)
|
|
/* make the previous entry point to this */
|
|
prevai->ai_next = ai;
|
|
|
|
ai->ai_family = he->h_addrtype;
|
|
|
|
/* we return all names as STREAM, so when using this address for TFTP
|
|
the type must be ignored and conn->socktype be used instead! */
|
|
ai->ai_socktype = SOCK_STREAM;
|
|
|
|
ai->ai_addrlen = ss_size;
|
|
/* make the ai_addr point to the address immediately following this struct
|
|
and use that area to store the address */
|
|
ai->ai_addr = (struct sockaddr *) ((char*)ai + sizeof(Curl_addrinfo));
|
|
|
|
/* need to free this eventually */
|
|
ai->ai_canonname = strdup(he->h_name);
|
|
|
|
/* leave the rest of the struct filled with zero */
|
|
|
|
switch (ai->ai_family) {
|
|
case AF_INET:
|
|
addr = (struct sockaddr_in *)ai->ai_addr; /* storage area for this info */
|
|
|
|
memcpy((char *)&(addr->sin_addr), curr, sizeof(struct in_addr));
|
|
addr->sin_family = (unsigned short)(he->h_addrtype);
|
|
addr->sin_port = htons((unsigned short)port);
|
|
break;
|
|
|
|
#ifdef CURLRES_IPV6
|
|
case AF_INET6:
|
|
addr6 = (struct sockaddr_in6 *)ai->ai_addr; /* storage area for this info */
|
|
|
|
memcpy((char *)&(addr6->sin6_addr), curr, sizeof(struct in6_addr));
|
|
addr6->sin6_family = (unsigned short)(he->h_addrtype);
|
|
addr6->sin6_port = htons((unsigned short)port);
|
|
break;
|
|
#endif /* CURLRES_IPV6 */
|
|
}
|
|
|
|
prevai = ai;
|
|
}
|
|
return firstai;
|
|
}
|
|
|
|
#endif /* CURLRES_IPV4 || CURLRES_ARES */
|