483 lines
12 KiB
C
483 lines
12 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: curl_addrinfo.c,v 1.5 2008-11-06 17:19:57 yangtse Exp $
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***************************************************************************/
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#include "setup.h"
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#include <curl/curl.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 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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#if defined(NETWARE) && defined(__NOVELL_LIBC__)
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# undef in_addr_t
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# define in_addr_t unsigned long
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#endif
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#include "curl_addrinfo.h"
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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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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* Curl_freeaddrinfo()
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*
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* This is used to free a linked list of Curl_addrinfo structs along
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* with all its associated allocated storage. This function should be
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* called once for each successful call to Curl_getaddrinfo_ex() or to
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* any function call which actually allocates a Curl_addrinfo struct.
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*/
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void
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Curl_freeaddrinfo(Curl_addrinfo *cahead)
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{
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Curl_addrinfo *ca, *canext;
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for(ca = cahead; ca != NULL; ca = canext) {
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if(ca->ai_addr)
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free(ca->ai_addr);
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if(ca->ai_canonname)
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free(ca->ai_canonname);
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canext = ca->ai_next;
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free(ca);
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}
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}
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#ifdef HAVE_GETADDRINFO
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/*
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* Curl_getaddrinfo_ex()
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*
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* This is a wrapper function around system's getaddrinfo(), with
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* the only difference that instead of returning a linked list of
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* addrinfo structs this one returns a linked list of Curl_addrinfo
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* ones. The memory allocated by this function *MUST* be free'd with
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* Curl_freeaddrinfo(). For each successful call to this function
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* there must be an associated call later to Curl_freeaddrinfo().
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*
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* There should be no single call to system's getaddrinfo() in the
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* whole library, any such call should be 'routed' through this one.
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*/
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int
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Curl_getaddrinfo_ex(const char *nodename,
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const char *servname,
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const struct addrinfo *hints,
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Curl_addrinfo **result)
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{
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const struct addrinfo *ainext;
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const struct addrinfo *ai;
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struct addrinfo *aihead;
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Curl_addrinfo *cafirst = NULL;
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Curl_addrinfo *calast = NULL;
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Curl_addrinfo *ca;
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int error;
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*result = NULL; /* assume failure */
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error = getaddrinfo(nodename, servname, hints, &aihead);
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if(error)
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return error;
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for(ai = aihead; ai != NULL; ai = ainext) {
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if((ca = malloc(sizeof(Curl_addrinfo))) == NULL) {
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error = EAI_MEMORY;
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break;
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}
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/* copy each structure member individually, member ordering, */
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/* size, or padding might be different for each structure. */
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ca->ai_flags = ai->ai_flags;
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ca->ai_family = ai->ai_family;
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ca->ai_socktype = ai->ai_socktype;
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ca->ai_protocol = ai->ai_protocol;
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ca->ai_addrlen = 0;
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ca->ai_addr = NULL;
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ca->ai_canonname = NULL;
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ca->ai_next = NULL;
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if((ai->ai_addrlen > 0) && (ai->ai_addr != NULL)) {
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ca->ai_addrlen = ai->ai_addrlen;
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if((ca->ai_addr = malloc(ca->ai_addrlen)) == NULL) {
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error = EAI_MEMORY;
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free(ca);
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break;
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}
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memcpy(ca->ai_addr, ai->ai_addr, ca->ai_addrlen);
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}
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if(ai->ai_canonname != NULL) {
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if((ca->ai_canonname = strdup(ai->ai_canonname)) == NULL) {
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error = EAI_MEMORY;
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if(ca->ai_addr)
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free(ca->ai_addr);
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free(ca);
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break;
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}
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}
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/* if the return list is empty, this becomes the first element */
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if(!cafirst)
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cafirst = ca;
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/* add this element last in the return list */
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if(calast)
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calast->ai_next = ca;
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calast = ca;
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/* fetch next element fom the addrinfo list */
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ainext = ai->ai_next;
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}
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/* destroy the addrinfo list */
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if(aihead)
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freeaddrinfo(aihead);
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/* if we failed, also destroy the Curl_addrinfo list */
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if(error) {
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Curl_freeaddrinfo(cafirst);
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cafirst = NULL;
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}
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*result = cafirst;
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/* This is not a CURLcode */
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return error;
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}
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#endif /* HAVE_GETADDRINFO */
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/*
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* Curl_he2ai()
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*
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* This function returns a pointer to the first element of a newly allocated
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* Curl_addrinfo struct linked list filled with the data of a given hostent.
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* Curl_addrinfo is meant to work like the addrinfo struct does for a IPv6
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* stack, but usable also for IPv4, all hosts and environments.
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*
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* The memory allocated by this function *MUST* be free'd later on calling
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* Curl_freeaddrinfo(). For each successful call to this function there
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* must be an associated call later to Curl_freeaddrinfo().
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*
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* Curl_addrinfo defined in "lib/curl_addrinfo.h"
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*
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* struct Curl_addrinfo {
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* int ai_flags;
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* int ai_family;
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* int ai_socktype;
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* int ai_protocol;
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* socklen_t ai_addrlen; * Follow rfc3493 struct addrinfo *
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* char *ai_canonname;
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* struct sockaddr *ai_addr;
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* struct Curl_addrinfo *ai_next;
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* };
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* typedef struct Curl_addrinfo Curl_addrinfo;
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*
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* hostent defined in <netdb.h>
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*
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* struct hostent {
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* char *h_name;
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* char **h_aliases;
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* int h_addrtype;
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* int h_length;
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* char **h_addr_list;
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* };
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*
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* for backward compatibility:
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*
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* #define h_addr h_addr_list[0]
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*/
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Curl_addrinfo *
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Curl_he2ai(const struct hostent *he, int port)
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{
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Curl_addrinfo *ai;
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Curl_addrinfo *prevai = NULL;
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Curl_addrinfo *firstai = NULL;
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struct sockaddr_in *addr;
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#ifdef ENABLE_IPV6
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struct sockaddr_in6 *addr6;
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#endif
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CURLcode result = CURLE_OK;
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int i;
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char *curr;
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if(!he)
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/* no input == no output! */
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return NULL;
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DEBUGASSERT((he->h_name != NULL) && (he->h_addr_list != NULL));
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for(i=0; (curr = he->h_addr_list[i]) != NULL; i++) {
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int ss_size;
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#ifdef ENABLE_IPV6
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if (he->h_addrtype == AF_INET6)
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ss_size = sizeof (struct sockaddr_in6);
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else
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#endif
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ss_size = sizeof (struct sockaddr_in);
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if((ai = calloc(1, sizeof(Curl_addrinfo))) == NULL) {
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result = CURLE_OUT_OF_MEMORY;
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break;
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}
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if((ai->ai_canonname = strdup(he->h_name)) == NULL) {
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result = CURLE_OUT_OF_MEMORY;
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free(ai);
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break;
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}
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if((ai->ai_addr = calloc(1, ss_size)) == NULL) {
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result = CURLE_OUT_OF_MEMORY;
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free(ai->ai_canonname);
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free(ai);
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break;
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}
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if(!firstai)
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/* store the pointer we want to return from this function */
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firstai = ai;
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if(prevai)
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/* make the previous entry point to this */
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prevai->ai_next = ai;
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ai->ai_family = he->h_addrtype;
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/* we return all names as STREAM, so when using this address for TFTP
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the type must be ignored and conn->socktype be used instead! */
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ai->ai_socktype = SOCK_STREAM;
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ai->ai_addrlen = ss_size;
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/* leave the rest of the struct filled with zero */
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switch (ai->ai_family) {
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case AF_INET:
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addr = (void *)ai->ai_addr; /* storage area for this info */
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memcpy(&addr->sin_addr, curr, sizeof(struct in_addr));
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addr->sin_family = (unsigned short)(he->h_addrtype);
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addr->sin_port = htons((unsigned short)port);
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break;
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#ifdef ENABLE_IPV6
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case AF_INET6:
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addr6 = (void *)ai->ai_addr; /* storage area for this info */
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memcpy(&addr6->sin6_addr, curr, sizeof(struct in6_addr));
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addr6->sin6_family = (unsigned short)(he->h_addrtype);
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addr6->sin6_port = htons((unsigned short)port);
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break;
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#endif
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}
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prevai = ai;
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}
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if(result != CURLE_OK) {
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Curl_freeaddrinfo(firstai);
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firstai = NULL;
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}
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return firstai;
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}
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struct namebuff {
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struct hostent hostentry;
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union {
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struct in_addr ina4;
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#ifdef ENABLE_IPV6
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struct in6_addr ina6;
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#endif
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} addrentry;
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char *h_addr_list[2];
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};
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/*
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* Curl_ip2addr()
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*
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* This function takes an internet address, in binary form, as input parameter
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* along with its address family and the string version of the address, and it
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* returns a Curl_addrinfo chain filled in correctly with information for the
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* given address/host
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*/
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Curl_addrinfo *
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Curl_ip2addr(int af, const void *inaddr, const char *hostname, int port)
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{
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Curl_addrinfo *ai;
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#if defined(VMS) && \
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defined(__INITIAL_POINTER_SIZE) && (__INITIAL_POINTER_SIZE == 64)
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#pragma pointer_size save
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#pragma pointer_size short
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#pragma message disable PTRMISMATCH
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#endif
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struct hostent *h;
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struct namebuff *buf;
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char *addrentry;
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char *hoststr;
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int addrsize;
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DEBUGASSERT(inaddr && hostname);
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buf = malloc(sizeof(struct namebuff));
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if(!buf)
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return NULL;
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hoststr = strdup(hostname);
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if(!hoststr) {
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free(buf);
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return NULL;
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}
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switch(af) {
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case AF_INET:
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addrsize = sizeof(struct in_addr);
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addrentry = (void *)&buf->addrentry.ina4;
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memcpy(addrentry, inaddr, sizeof(struct in_addr));
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break;
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#ifdef ENABLE_IPV6
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case AF_INET6:
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addrsize = sizeof(struct in6_addr);
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addrentry = (void *)&buf->addrentry.ina6;
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memcpy(addrentry, inaddr, sizeof(struct in6_addr));
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break;
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#endif
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default:
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free(hoststr);
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free(buf);
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return NULL;
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}
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h = &buf->hostentry;
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h->h_name = hoststr;
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h->h_aliases = NULL;
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h->h_addrtype = (short)af;
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h->h_length = (short)addrsize;
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h->h_addr_list = &buf->h_addr_list[0];
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h->h_addr_list[0] = addrentry;
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h->h_addr_list[1] = NULL; /* terminate list of entries */
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#if defined(VMS) && \
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defined(__INITIAL_POINTER_SIZE) && (__INITIAL_POINTER_SIZE == 64)
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#pragma pointer_size restore
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#pragma message enable PTRMISMATCH
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#endif
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ai = Curl_he2ai(h, port);
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free(hoststr);
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free(buf);
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return ai;
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}
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#if defined(CURLDEBUG) && defined(HAVE_FREEADDRINFO)
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/*
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* curl_dofreeaddrinfo()
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*
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* This is strictly for memory tracing and are using the same style as the
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* family otherwise present in memdebug.c. I put these ones here since they
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* require a bunch of structs I didn't wanna include in memdebug.c
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*/
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void
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curl_dofreeaddrinfo(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, (void *)freethis);
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}
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#endif /* defined(CURLDEBUG) && defined(HAVE_FREEADDRINFO) */
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#if defined(CURLDEBUG) && defined(HAVE_GETADDRINFO)
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/*
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* curl_dogetaddrinfo()
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*
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* This is strictly for memory tracing and are using the same style as the
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* family otherwise present in memdebug.c. I put these ones here since they
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* require a bunch of structs I didn't wanna include in memdebug.c
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*/
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int
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curl_dogetaddrinfo(const char *hostname,
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const char *service,
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const 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, (void *)*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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#endif /* defined(CURLDEBUG) && defined(HAVE_GETADDRINFO) */
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