203 lines
6.0 KiB
C
203 lines
6.0 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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* The contents of this file are subject to the Mozilla Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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* License for the specific language governing rights and limitations
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* under the License.
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*
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* The Original Code is Curl.
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*
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* The Initial Developer of the Original Code is Daniel Stenberg.
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*
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* Portions created by the Initial Developer are Copyright (C) 1998.
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* All Rights Reserved.
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*
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* ------------------------------------------------------------
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* Main author:
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* - Daniel Stenberg <daniel@haxx.se>
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*
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* http://curl.haxx.se
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*
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* $Source$
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* $Revision$
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* $Date$
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* $Author$
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* $State$
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* $Locker$
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*
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* ------------------------------------------------------------
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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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#endif
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#include "urldata.h"
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#include "sendf.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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/* --- resolve name or IP-number --- */
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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 stolen from the Dancer source code,
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written by Bjorn Reese, it has since been patched and modified. */
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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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struct hostent *GetHost(struct UrlData *data,
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char *hostname,
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char **bufp)
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{
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struct hostent *h = NULL;
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unsigned long 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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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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#endif
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}
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return (h);
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}
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