8d7f402efb
- Use a global dns cache (via setting the tentatively named,
CURLOPT_DNS_USE_GLOBAL_CACHE option to true)
- Use a per-handle dns cache, by default
- Use a pooled dns cache when in the "multi" interface
420 lines
11 KiB
C
420 lines
11 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) 2001, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* In order to be useful for every potential user, curl and libcurl are
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* dual-licensed under the MPL and the MIT/X-derivate licenses.
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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 MPL or the MIT/X-derivate
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* licenses. You may pick one of these licenses.
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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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#include <errno.h>
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#define _REENTRANT
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#if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
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#include <winsock.h>
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#else
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.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 VMS
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#include <inet.h>
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#include <stdlib.h>
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#endif
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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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#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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/* The last #include file should be: */
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#ifdef MALLOCDEBUG
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#include "memdebug.h"
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#endif
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static curl_hash hostname_cache;
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static int host_cache_initialized;
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void Curl_global_host_cache_init(void)
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{
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if (!host_cache_initialized) {
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curl_hash_init(&hostname_cache, 7, Curl_freeaddrinfo);
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host_cache_initialized = 1;
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}
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}
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curl_hash *Curl_global_host_cache_get(void)
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{
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return &hostname_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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}
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}
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Curl_addrinfo *Curl_resolv(struct SessionHandle *data,
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char *hostname,
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int port,
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char **bufp)
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{
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Curl_addrinfo *addr = NULL;
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size_t hostname_len = strlen(hostname)+1;
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if (curl_hash_find(data->hostcache, hostname, hostname_len, (void **) &addr)) {
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return addr;
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}
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addr = Curl_getaddrinfo(data, hostname, port, bufp);
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if (!addr)
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return NULL;
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curl_hash_add(data->hostcache, hostname, hostname_len, (const void *) addr);
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return addr;
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}
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/*
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* This is a wrapper function for freeing name information in a protocol
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* independent way. This takes care of using the appropriate underlaying
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* proper function.
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*/
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void Curl_freeaddrinfo(void *freethis)
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{
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#ifdef ENABLE_IPV6
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freeaddrinfo(freethis);
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#else
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free(freethis);
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#endif
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}
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/* --- resolve name or IP-number --- */
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#ifdef ENABLE_IPV6
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#ifdef MALLOCDEBUG
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/* These two are strictly for memory tracing and are using the same
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* style as the family otherwise present in memdebug.c. I put these ones
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* here since they require a bunch of struct types I didn't wanna include
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* in memdebug.c
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*/
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int curl_getaddrinfo(char *hostname, char *service,
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struct addrinfo *hints,
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struct addrinfo **result,
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int line, const char *source)
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{
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int res=(getaddrinfo)(hostname, service, hints, result);
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if(0 == res) {
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/* success */
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if(logfile)
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fprintf(logfile, "ADDR %s:%d getaddrinfo() = %p\n",
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source, line, *result);
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}
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else {
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if(logfile)
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fprintf(logfile, "ADDR %s:%d getaddrinfo() failed\n",
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source, line);
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}
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return res;
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}
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void curl_freeaddrinfo(struct addrinfo *freethis,
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int line, const char *source)
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{
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(freeaddrinfo)(freethis);
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if(logfile)
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fprintf(logfile, "ADDR %s:%d freeaddrinfo(%p)\n",
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source, line, freethis);
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}
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#endif
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/*
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* Return name information about the given hostname and port number. If
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* successful, the 'addrinfo' is returned and the forth argument will point to
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* memory we need to free after use. That meory *MUST* be freed with
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* Curl_freeaddrinfo(), nothing else.
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*/
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Curl_addrinfo *Curl_getaddrinfo(struct SessionHandle *data,
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char *hostname,
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int port,
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char **bufp)
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{
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struct addrinfo hints, *res;
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int error;
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char sbuf[NI_MAXSERV];
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = PF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags = AI_CANONNAME;
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snprintf(sbuf, sizeof(sbuf), "%d", port);
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error = getaddrinfo(hostname, sbuf, &hints, &res);
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if (error) {
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infof(data, "getaddrinfo(3) failed for %s\n", hostname);
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return NULL;
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}
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*bufp=(char *)res; /* make it point to the result struct */
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return res;
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}
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#else /* following code is IPv4-only */
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#ifndef HAVE_GETHOSTBYNAME_R
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/**
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* Performs a "deep" copy of a hostent into a buffer (returns a pointer to the
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* copy). Make absolutely sure the destination buffer is big enough!
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*
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* Keith McGuigan
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* 10/3/2001 */
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static struct hostent* pack_hostent(char* buf, struct hostent* orig)
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{
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char* bufptr;
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struct hostent* copy;
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int i;
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char* str;
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int len;
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bufptr = buf;
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copy = (struct hostent*)bufptr;
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bufptr += sizeof(struct hostent);
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copy->h_name = bufptr;
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len = strlen(orig->h_name) + 1;
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strncpy(bufptr, orig->h_name, len);
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bufptr += len;
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/* we align on even 64bit boundaries for safety */
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#define MEMALIGN(x) (((unsigned long)(x)&0xfffffff8)+8)
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/* This must be aligned properly to work on many CPU architectures! */
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copy->h_aliases = (char**)MEMALIGN(bufptr);
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/* Figure out how many aliases there are */
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for (i = 0; orig->h_aliases[i] != NULL; ++i);
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/* Reserve room for the array */
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bufptr += (i + 1) * sizeof(char*);
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/* Clone all known aliases */
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for(i = 0; (str = orig->h_aliases[i]); i++) {
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len = strlen(str) + 1;
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strncpy(bufptr, str, len);
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copy->h_aliases[i] = bufptr;
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bufptr += len;
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}
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/* Terminate the alias list with a NULL */
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copy->h_aliases[i] = NULL;
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copy->h_addrtype = orig->h_addrtype;
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copy->h_length = orig->h_length;
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/* align it for (at least) 32bit accesses */
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bufptr = (char *)MEMALIGN(bufptr);
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copy->h_addr_list = (char**)bufptr;
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/* Figure out how many addresses there are */
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for (i = 0; orig->h_addr_list[i] != NULL; ++i);
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/* Reserve room for the array */
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bufptr += (i + 1) * sizeof(char*);
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i = 0;
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len = orig->h_length;
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str = orig->h_addr_list[i];
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while (str != NULL) {
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memcpy(bufptr, str, len);
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copy->h_addr_list[i] = bufptr;
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bufptr += len;
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str = orig->h_addr_list[++i];
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}
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copy->h_addr_list[i] = NULL;
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return copy;
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}
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#endif
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static char *MakeIP(unsigned long num,char *addr, int addr_len)
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{
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#if defined(HAVE_INET_NTOA) || defined(HAVE_INET_NTOA_R)
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struct in_addr in;
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in.s_addr = htonl(num);
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#if defined(HAVE_INET_NTOA_R)
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inet_ntoa_r(in,addr,addr_len);
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#else
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strncpy(addr,inet_ntoa(in),addr_len);
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#endif
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#else
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unsigned char *paddr;
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num = htonl(num); /* htonl() added to avoid endian probs */
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paddr = (unsigned char *)#
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sprintf(addr, "%u.%u.%u.%u", paddr[0], paddr[1], paddr[2], paddr[3]);
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#endif
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return (addr);
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}
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/* The original code to this function was once stolen from the Dancer source
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code, written by Bjorn Reese, it has since been patched and modified
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considerably. */
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#ifndef INADDR_NONE
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#define INADDR_NONE (unsigned long) ~0
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#endif
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Curl_addrinfo *Curl_getaddrinfo(struct SessionHandle *data,
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char *hostname,
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int port,
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char **bufp)
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{
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struct hostent *h = NULL;
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in_addr_t in;
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int ret; /* this variable is unused on several platforms but used on some */
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#define CURL_NAMELOOKUP_SIZE 9000
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/* Allocate enough memory to hold the full name information structs and
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* everything. OSF1 is known to require at least 8872 bytes. The buffer
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* required for storing all possible aliases and IP numbers is according to
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* Stevens' Unix Network Programming 2nd editor, p. 304: 8192 bytes! */
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char *buf = (char *)malloc(CURL_NAMELOOKUP_SIZE);
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if(!buf)
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return NULL; /* major failure */
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*bufp = buf;
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port=0; /* unused in IPv4 code */
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ret = 0; /* to prevent the compiler warning */
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if ( (in=inet_addr(hostname)) != INADDR_NONE ) {
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struct in_addr *addrentry;
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h = (struct hostent*)buf;
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h->h_addr_list = (char**)(buf + sizeof(*h));
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addrentry = (struct in_addr*)(h->h_addr_list + 2);
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addrentry->s_addr = in;
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h->h_addr_list[0] = (char*)addrentry;
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h->h_addr_list[1] = NULL;
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h->h_addrtype = AF_INET;
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h->h_length = sizeof(*addrentry);
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h->h_name = *(h->h_addr_list) + h->h_length;
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/* bad one h->h_name = (char*)(h->h_addr_list + h->h_length); */
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MakeIP(ntohl(in),h->h_name, CURL_NAMELOOKUP_SIZE - (long)(h->h_name) + (long)buf);
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}
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#if defined(HAVE_GETHOSTBYNAME_R)
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else {
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int h_errnop;
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/* Workaround for gethostbyname_r bug in qnx nto. It is also _required_
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for some of these functions. */
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memset(buf, 0, CURL_NAMELOOKUP_SIZE);
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#ifdef HAVE_GETHOSTBYNAME_R_5
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/* Solaris, IRIX and more */
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if ((h = gethostbyname_r(hostname,
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(struct hostent *)buf,
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buf + sizeof(struct hostent),
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CURL_NAMELOOKUP_SIZE - sizeof(struct hostent),
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&h_errnop)) == NULL )
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#endif
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#ifdef HAVE_GETHOSTBYNAME_R_6
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/* Linux */
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if( gethostbyname_r(hostname,
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(struct hostent *)buf,
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buf + sizeof(struct hostent),
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CURL_NAMELOOKUP_SIZE - sizeof(struct hostent),
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&h, /* DIFFERENCE */
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&h_errnop))
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#endif
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#ifdef HAVE_GETHOSTBYNAME_R_3
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/* AIX, Digital Unix, HPUX 10, more? */
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if(CURL_NAMELOOKUP_SIZE >=
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(sizeof(struct hostent)+sizeof(struct hostent_data)))
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/* August 22nd, 2000: Albert Chin-A-Young brought an updated version
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* that should work! September 20: Richard Prescott worked on the buffer
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* size dilemma. */
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ret = gethostbyname_r(hostname,
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(struct hostent *)buf,
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(struct hostent_data *)(buf + sizeof(struct hostent)));
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else
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ret = -1; /* failure, too smallish buffer size */
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/* result expected in h */
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h = (struct hostent*)buf;
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h_errnop= errno; /* we don't deal with this, but set it anyway */
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if(ret)
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#endif
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{
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infof(data, "gethostbyname_r(2) failed for %s\n", hostname);
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h = NULL; /* set return code to NULL */
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free(buf);
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*bufp=NULL;
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}
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#else
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else {
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if ((h = gethostbyname(hostname)) == NULL ) {
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infof(data, "gethostbyname(2) failed for %s\n", hostname);
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free(buf);
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*bufp=NULL;
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}
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else
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/* we make a copy of the hostent right now, right here, as the
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static one we got a pointer to might get removed when we don't
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want/expect that */
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h = pack_hostent(buf, h);
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#endif
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}
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return (h);
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}
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#endif /* end of IPv4-specific code */
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/*
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* local variables:
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* eval: (load-file "../curl-mode.el")
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* end:
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* vim600: fdm=marker
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* vim: et sw=2 ts=2 sts=2 tw=78
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*/
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