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wget/lib/getaddrinfo.c

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/* Get address information (partial implementation).
Copyright (C) 1997, 2001-2002, 2004-2019 Free Software Foundation, Inc.
Contributed by Simon Josefsson <simon@josefsson.org>.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <https://www.gnu.org/licenses/>. */
/* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
optimizes away the sa == NULL test below. */
#define _GL_ARG_NONNULL(params)
#include <config.h>
#include <netdb.h>
#if HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
/* Get inet_ntop. */
#include <arpa/inet.h>
/* Get calloc. */
#include <stdlib.h>
/* Get memcpy, strdup. */
#include <string.h>
/* Get snprintf. */
#include <stdio.h>
#include <stdbool.h>
#include "gettext.h"
#define _(String) gettext (String)
#define N_(String) String
/* BeOS has AF_INET, but not PF_INET. */
#ifndef PF_INET
# define PF_INET AF_INET
#endif
/* BeOS also lacks PF_UNSPEC. */
#ifndef PF_UNSPEC
# define PF_UNSPEC 0
#endif
#if defined _WIN32 && !defined __CYGWIN__
# define WINDOWS_NATIVE
#endif
/* gl_sockets_startup */
#include "sockets.h"
#ifdef WINDOWS_NATIVE
/* Avoid warnings from gcc -Wcast-function-type. */
# define GetProcAddress \
(void *) GetProcAddress
typedef int (WSAAPI *getaddrinfo_func) (const char*, const char*,
const struct addrinfo*,
struct addrinfo**);
typedef void (WSAAPI *freeaddrinfo_func) (struct addrinfo*);
typedef int (WSAAPI *getnameinfo_func) (const struct sockaddr*,
socklen_t, char*, DWORD,
char*, DWORD, int);
static getaddrinfo_func getaddrinfo_ptr = NULL;
static freeaddrinfo_func freeaddrinfo_ptr = NULL;
static getnameinfo_func getnameinfo_ptr = NULL;
static int
use_win32_p (void)
{
static int done = 0;
HMODULE h;
if (done)
return getaddrinfo_ptr ? 1 : 0;
done = 1;
h = GetModuleHandle ("ws2_32.dll");
if (h)
{
getaddrinfo_ptr = (getaddrinfo_func) GetProcAddress (h, "getaddrinfo");
freeaddrinfo_ptr = (freeaddrinfo_func) GetProcAddress (h, "freeaddrinfo");
getnameinfo_ptr = (getnameinfo_func) GetProcAddress (h, "getnameinfo");
}
/* If either is missing, something is odd. */
if (!getaddrinfo_ptr || !freeaddrinfo_ptr || !getnameinfo_ptr)
{
getaddrinfo_ptr = NULL;
freeaddrinfo_ptr = NULL;
getnameinfo_ptr = NULL;
return 0;
}
gl_sockets_startup (SOCKETS_1_1);
return 1;
}
#endif
static bool
validate_family (int family)
{
/* FIXME: Support more families. */
#if HAVE_IPV4
if (family == PF_INET)
return true;
#endif
#if HAVE_IPV6
if (family == PF_INET6)
return true;
#endif
if (family == PF_UNSPEC)
return true;
return false;
}
/* Translate name of a service location and/or a service name to set of
socket addresses. */
int
getaddrinfo (const char *restrict nodename,
const char *restrict servname,
const struct addrinfo *restrict hints,
struct addrinfo **restrict res)
{
struct addrinfo *tmp;
int port = 0;
struct hostent *he;
void *storage;
size_t size;
#if HAVE_IPV6
struct v6_pair {
struct addrinfo addrinfo;
struct sockaddr_in6 sockaddr_in6;
};
#endif
#if HAVE_IPV4
struct v4_pair {
struct addrinfo addrinfo;
struct sockaddr_in sockaddr_in;
};
#endif
#ifdef WINDOWS_NATIVE
if (use_win32_p ())
return getaddrinfo_ptr (nodename, servname, hints, res);
#endif
if (hints && (hints->ai_flags & ~(AI_CANONNAME|AI_PASSIVE)))
/* FIXME: Support more flags. */
return EAI_BADFLAGS;
if (hints && !validate_family (hints->ai_family))
return EAI_FAMILY;
if (hints &&
hints->ai_socktype != SOCK_STREAM && hints->ai_socktype != SOCK_DGRAM)
/* FIXME: Support other socktype. */
return EAI_SOCKTYPE; /* FIXME: Better return code? */
if (!nodename)
{
if (!(hints->ai_flags & AI_PASSIVE))
return EAI_NONAME;
#ifdef HAVE_IPV6
nodename = (hints->ai_family == AF_INET6) ? "::" : "0.0.0.0";
#else
nodename = "0.0.0.0";
#endif
}
if (servname)
{
struct servent *se = NULL;
const char *proto =
(hints && hints->ai_socktype == SOCK_DGRAM) ? "udp" : "tcp";
if (hints == NULL || !(hints->ai_flags & AI_NUMERICSERV))
/* FIXME: Use getservbyname_r if available. */
se = getservbyname (servname, proto);
if (!se)
{
char *c;
if (!(*servname >= '0' && *servname <= '9'))
return EAI_NONAME;
port = strtoul (servname, &c, 10);
if (*c || port > 0xffff)
return EAI_NONAME;
port = htons (port);
}
else
port = se->s_port;
}
/* FIXME: Use gethostbyname_r if available. */
he = gethostbyname (nodename);
if (!he || he->h_addr_list[0] == NULL)
return EAI_NONAME;
switch (he->h_addrtype)
{
#if HAVE_IPV6
case PF_INET6:
size = sizeof (struct v6_pair);
break;
#endif
#if HAVE_IPV4
case PF_INET:
size = sizeof (struct v4_pair);
break;
#endif
default:
return EAI_NODATA;
}
storage = calloc (1, size);
if (!storage)
return EAI_MEMORY;
switch (he->h_addrtype)
{
#if HAVE_IPV6
case PF_INET6:
{
struct v6_pair *p = storage;
struct sockaddr_in6 *sinp = &p->sockaddr_in6;
tmp = &p->addrinfo;
if (port)
sinp->sin6_port = port;
if (he->h_length != sizeof (sinp->sin6_addr))
{
free (storage);
return EAI_SYSTEM; /* FIXME: Better return code? Set errno? */
}
memcpy (&sinp->sin6_addr, he->h_addr_list[0], sizeof sinp->sin6_addr);
tmp->ai_addr = (struct sockaddr *) sinp;
tmp->ai_addrlen = sizeof *sinp;
}
break;
#endif
#if HAVE_IPV4
case PF_INET:
{
struct v4_pair *p = storage;
struct sockaddr_in *sinp = &p->sockaddr_in;
tmp = &p->addrinfo;
if (port)
sinp->sin_port = port;
if (he->h_length != sizeof (sinp->sin_addr))
{
free (storage);
return EAI_SYSTEM; /* FIXME: Better return code? Set errno? */
}
memcpy (&sinp->sin_addr, he->h_addr_list[0], sizeof sinp->sin_addr);
tmp->ai_addr = (struct sockaddr *) sinp;
tmp->ai_addrlen = sizeof *sinp;
}
break;
#endif
default:
free (storage);
return EAI_NODATA;
}
if (hints && hints->ai_flags & AI_CANONNAME)
{
const char *cn;
if (he->h_name)
cn = he->h_name;
else
cn = nodename;
tmp->ai_canonname = strdup (cn);
if (!tmp->ai_canonname)
{
free (storage);
return EAI_MEMORY;
}
}
tmp->ai_protocol = (hints) ? hints->ai_protocol : 0;
tmp->ai_socktype = (hints) ? hints->ai_socktype : 0;
tmp->ai_addr->sa_family = he->h_addrtype;
tmp->ai_family = he->h_addrtype;
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
switch (he->h_addrtype)
{
#if HAVE_IPV4
case AF_INET:
tmp->ai_addr->sa_len = sizeof (struct sockaddr_in);
break;
#endif
#if HAVE_IPV6
case AF_INET6:
tmp->ai_addr->sa_len = sizeof (struct sockaddr_in6);
break;
#endif
}
#endif
/* FIXME: If more than one address, create linked list of addrinfo's. */
*res = tmp;
return 0;
}
/* Free 'addrinfo' structure AI including associated storage. */
void
freeaddrinfo (struct addrinfo *ai)
{
#ifdef WINDOWS_NATIVE
if (use_win32_p ())
{
freeaddrinfo_ptr (ai);
return;
}
#endif
while (ai)
{
struct addrinfo *cur;
cur = ai;
ai = ai->ai_next;
free (cur->ai_canonname);
free (cur);
}
}
int
getnameinfo (const struct sockaddr *restrict sa, socklen_t salen,
char *restrict node, socklen_t nodelen,
char *restrict service, socklen_t servicelen,
int flags)
{
#ifdef WINDOWS_NATIVE
if (use_win32_p ())
return getnameinfo_ptr (sa, salen, node, nodelen,
service, servicelen, flags);
#endif
/* FIXME: Support other flags. */
if ((node && nodelen > 0 && !(flags & NI_NUMERICHOST)) ||
(service && servicelen > 0 && !(flags & NI_NUMERICHOST)) ||
(flags & ~(NI_NUMERICHOST|NI_NUMERICSERV)))
return EAI_BADFLAGS;
if (sa == NULL || salen < sizeof (sa->sa_family))
return EAI_FAMILY;
switch (sa->sa_family)
{
#if HAVE_IPV4
case AF_INET:
if (salen < sizeof (struct sockaddr_in))
return EAI_FAMILY;
break;
#endif
#if HAVE_IPV6
case AF_INET6:
if (salen < sizeof (struct sockaddr_in6))
return EAI_FAMILY;
break;
#endif
default:
return EAI_FAMILY;
}
if (node && nodelen > 0 && flags & NI_NUMERICHOST)
{
switch (sa->sa_family)
{
#if HAVE_IPV4
case AF_INET:
if (!inet_ntop (AF_INET,
&(((const struct sockaddr_in *) sa)->sin_addr),
node, nodelen))
return EAI_SYSTEM;
break;
#endif
#if HAVE_IPV6
case AF_INET6:
if (!inet_ntop (AF_INET6,
&(((const struct sockaddr_in6 *) sa)->sin6_addr),
node, nodelen))
return EAI_SYSTEM;
break;
#endif
default:
return EAI_FAMILY;
}
}
if (service && servicelen > 0 && flags & NI_NUMERICSERV)
switch (sa->sa_family)
{
#if HAVE_IPV4
case AF_INET:
#endif
#if HAVE_IPV6
case AF_INET6:
#endif
{
unsigned short int port
= ntohs (((const struct sockaddr_in *) sa)->sin_port);
if (servicelen <= snprintf (service, servicelen, "%u", port))
return EAI_OVERFLOW;
}
break;
}
return 0;
}
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