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curl/lib/curl_addrinfo.c
Yang Tse 005bf19acf remove bogus comment
2008-10-30 15:13:22 +00:00

332 lines
8.5 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* $Id$
***************************************************************************/
#include "setup.h"
#include <curl/curl.h>
#ifdef NEED_MALLOC_H
# include <malloc.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
# include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#ifdef HAVE_NETDB_H
# include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#ifdef VMS
# include <in.h>
# include <inet.h>
# include <stdlib.h>
#endif
#if defined(NETWARE) && defined(__NOVELL_LIBC__)
# undef in_addr_t
# define in_addr_t unsigned long
#endif
#include "curl_addrinfo.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#include "memory.h"
/* The last #include file should be: */
#include "memdebug.h"
/*
* Curl_freeaddrinfo()
*
* This is used to free a linked list of Curl_addrinfo structs along
* with all its associated allocated storage. This function should be
* called once for each successful call to Curl_getaddrinfo_ex() or to
* any function call which actually allocates a Curl_addrinfo struct.
*/
void
Curl_freeaddrinfo(Curl_addrinfo *cahead)
{
Curl_addrinfo *ca, *canext;
for(ca = cahead; ca != NULL; ca = canext) {
if(ca->ai_addr)
free(ca->ai_addr);
if(ca->ai_canonname)
free(ca->ai_canonname);
canext = ca->ai_next;
free(ca);
}
}
#ifdef HAVE_GETADDRINFO
/*
* Curl_getaddrinfo_ex()
*
* This is a warapper function around system's getaddrinfo(), with
* the only difference that instead of returning a linked list of
* addrinfo structs this one returns a linked list of Curl_addrinfo
* ones. The memory allocated by this function *MUST* be free'd with
* Curl_freeaddrinfo(). For each successful call to this function
* there must be an associated call later to Curl_freeaddrinfo().
*
* There should be no single call to system's getaddrinfo() in the
* whole library, any such call should be 'routed' through this one.
*/
int
Curl_getaddrinfo_ex(const char *nodename,
const char *servname,
const struct addrinfo *hints,
Curl_addrinfo **result)
{
const struct addrinfo *ainext;
const struct addrinfo *ai;
struct addrinfo *aihead;
Curl_addrinfo *cafirst = NULL;
Curl_addrinfo *calast = NULL;
Curl_addrinfo *ca;
int error;
*result = NULL; /* assume failure */
error = getaddrinfo(nodename, servname, hints, &aihead);
if(error)
return error;
for(ai = aihead; ai != NULL; ai = ainext) {
if((ca = malloc(sizeof(Curl_addrinfo))) == NULL) {
error = EAI_MEMORY;
break;
}
/* copy each structure member individually, member ordering, */
/* size, or padding might be different for each structure. */
ca->ai_flags = ai->ai_flags;
ca->ai_family = ai->ai_family;
ca->ai_socktype = ai->ai_socktype;
ca->ai_protocol = ai->ai_protocol;
ca->ai_addrlen = 0;
ca->ai_addr = NULL;
ca->ai_canonname = NULL;
ca->ai_next = NULL;
if((ai->ai_addrlen > 0) && (ai->ai_addr != NULL)) {
ca->ai_addrlen = ai->ai_addrlen;
if((ca->ai_addr = malloc(ca->ai_addrlen)) == NULL) {
error = EAI_MEMORY;
free(ca);
break;
}
memcpy(ca->ai_addr, ai->ai_addr, ca->ai_addrlen);
}
if(ai->ai_canonname != NULL) {
if((ca->ai_canonname = strdup(ai->ai_canonname)) == NULL) {
error = EAI_MEMORY;
if(ca->ai_addr)
free(ca->ai_addr);
free(ca);
break;
}
}
/* if the return list is empty, this becomes the first element */
if(!cafirst)
cafirst = ca;
/* add this element last in the return list */
if(calast)
calast->ai_next = ca;
calast = ca;
/* fetch next element fom the addrinfo list */
ainext = ai->ai_next;
}
/* destroy the addrinfo list */
if(aihead)
freeaddrinfo(aihead);
/* if we failed, also destroy the Curl_addrinfo list */
if(error) {
Curl_freeaddrinfo(cafirst);
cafirst = NULL;
}
*result = cafirst;
return error; /* This is not a CURLcode */
}
#endif /* HAVE_GETADDRINFO */
/*
* Curl_he2ai()
*
* This function returns a pointer to the first element of a newly allocated
* Curl_addrinfo struct linked list filled with the data of a given hostent.
* Curl_addrinfo is meant to work like the addrinfo struct does for a IPv6
* stack, but usable also for IPv4, all hosts and environments.
*
* The memory allocated by this function *MUST* be free'd later on calling
* Curl_freeaddrinfo(). For each successful call to this function there
* must be an associated call later to Curl_freeaddrinfo().
*
* Curl_addrinfo defined in "lib/curl_addrinfo.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;
* };
* typedef struct Curl_addrinfo Curl_addrinfo;
*
* 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 ENABLE_IPV6
struct sockaddr_in6 *addr6;
#endif
CURLcode result = CURLE_OK;
int i;
char *curr;
if(!he)
/* no input == no output! */
return NULL;
for(i=0; (curr = he->h_addr_list[i]) != NULL; i++) {
int ss_size;
#ifdef ENABLE_IPV6
if (he->h_addrtype == AF_INET6)
ss_size = sizeof (struct sockaddr_in6);
else
#endif
ss_size = sizeof (struct sockaddr_in);
if((ai = calloc(1, sizeof(Curl_addrinfo))) == NULL) {
result = CURLE_OUT_OF_MEMORY;
break;
}
if((ai->ai_canonname = strdup(he->h_name)) == NULL) {
result = CURLE_OUT_OF_MEMORY;
free(ai);
break;
}
if((ai->ai_addr = calloc(1, ss_size)) == NULL) {
result = CURLE_OUT_OF_MEMORY;
free(ai->ai_canonname);
free(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;
/* 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(&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 ENABLE_IPV6
case AF_INET6:
addr6 = (struct sockaddr_in6 *)ai->ai_addr; /* storage area for this info */
memcpy(&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
}
prevai = ai;
}
if(result != CURLE_OK) {
Curl_freeaddrinfo(firstai);
firstai = NULL;
}
return firstai;
}
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