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curl/lib/hostip6.c
Daniel Stenberg dcd6f81025
snprintf: renamed and we now only use msnprintf()
The function does not return the same value as snprintf() normally does,
so readers may be mislead into thinking the code works differently than
it actually does. A different function name makes this easier to detect.

Reported-by: Tomas Hoger
Assisted-by: Daniel Gustafsson
Fixes #3296
Closes #3297
2018-11-23 08:26:51 +01:00

202 lines
5.3 KiB
C

/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2018, 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 https://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.
*
***************************************************************************/
#include "curl_setup.h"
/***********************************************************************
* Only for IPv6-enabled builds
**********************************************************************/
#ifdef CURLRES_IPV6
#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>
#endif
#ifdef HAVE_PROCESS_H
#include <process.h>
#endif
#include "urldata.h"
#include "sendf.h"
#include "hostip.h"
#include "hash.h"
#include "share.h"
#include "strerror.h"
#include "url.h"
#include "inet_pton.h"
#include "connect.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
/*
* Curl_ipv6works() returns TRUE if IPv6 seems to work.
*/
bool Curl_ipv6works(void)
{
/* the nature of most system is that IPv6 status doesn't come and go
during a program's lifetime so we only probe the first time and then we
have the info kept for fast re-use */
static int ipv6_works = -1;
if(-1 == ipv6_works) {
/* probe to see if we have a working IPv6 stack */
curl_socket_t s = socket(PF_INET6, SOCK_DGRAM, 0);
if(s == CURL_SOCKET_BAD)
/* an IPv6 address was requested but we can't get/use one */
ipv6_works = 0;
else {
ipv6_works = 1;
Curl_closesocket(NULL, s);
}
}
return (ipv6_works>0)?TRUE:FALSE;
}
/*
* Curl_ipvalid() checks what CURL_IPRESOLVE_* requirements that might've
* been set and returns TRUE if they are OK.
*/
bool Curl_ipvalid(struct connectdata *conn)
{
if(conn->ip_version == CURL_IPRESOLVE_V6)
return Curl_ipv6works();
return TRUE;
}
#if defined(CURLRES_SYNCH)
#ifdef DEBUG_ADDRINFO
static void dump_addrinfo(struct connectdata *conn, const Curl_addrinfo *ai)
{
printf("dump_addrinfo:\n");
for(; ai; ai = ai->ai_next) {
char buf[INET6_ADDRSTRLEN];
printf(" fam %2d, CNAME %s, ",
ai->ai_family, ai->ai_canonname ? ai->ai_canonname : "<none>");
if(Curl_printable_address(ai, buf, sizeof(buf)))
printf("%s\n", buf);
else
printf("failed; %s\n", Curl_strerror(conn, SOCKERRNO));
}
}
#else
#define dump_addrinfo(x,y) Curl_nop_stmt
#endif
/*
* Curl_getaddrinfo() when built IPv6-enabled (non-threading and
* non-ares version).
*
* Returns name information about the given hostname and port number. If
* successful, the 'addrinfo' is returned and the forth argument will point to
* memory we need to free after use. That memory *MUST* be freed with
* Curl_freeaddrinfo(), nothing else.
*/
Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
const char *hostname,
int port,
int *waitp)
{
struct addrinfo hints;
Curl_addrinfo *res;
int error;
char sbuf[12];
char *sbufptr = NULL;
#ifndef USE_RESOLVE_ON_IPS
char addrbuf[128];
#endif
int pf;
#if !defined(CURL_DISABLE_VERBOSE_STRINGS)
struct Curl_easy *data = conn->data;
#endif
*waitp = 0; /* synchronous response only */
/* Check if a limited name resolve has been requested */
switch(conn->ip_version) {
case CURL_IPRESOLVE_V4:
pf = PF_INET;
break;
case CURL_IPRESOLVE_V6:
pf = PF_INET6;
break;
default:
pf = PF_UNSPEC;
break;
}
if((pf != PF_INET) && !Curl_ipv6works())
/* The stack seems to be a non-IPv6 one */
pf = PF_INET;
memset(&hints, 0, sizeof(hints));
hints.ai_family = pf;
hints.ai_socktype = conn->socktype;
#ifndef USE_RESOLVE_ON_IPS
/*
* The AI_NUMERICHOST must not be set to get synthesized IPv6 address from
* an IPv4 address on iOS and Mac OS X.
*/
if((1 == Curl_inet_pton(AF_INET, hostname, addrbuf)) ||
(1 == Curl_inet_pton(AF_INET6, hostname, addrbuf))) {
/* the given address is numerical only, prevent a reverse lookup */
hints.ai_flags = AI_NUMERICHOST;
}
#endif
if(port) {
msnprintf(sbuf, sizeof(sbuf), "%d", port);
sbufptr = sbuf;
}
error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &res);
if(error) {
infof(data, "getaddrinfo(3) failed for %s:%d\n", hostname, port);
return NULL;
}
if(port) {
Curl_addrinfo_set_port(res, port);
}
dump_addrinfo(conn, res);
return res;
}
#endif /* CURLRES_SYNCH */
#endif /* CURLRES_IPV6 */