mirror of https://code.videolan.org/videolan/vlc
308 lines
8.2 KiB
C
308 lines
8.2 KiB
C
/*****************************************************************************
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* getaddrinfo.c: getaddrinfo/getnameinfo replacement functions
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*****************************************************************************
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* Copyright (C) 2005 the VideoLAN team
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* Copyright (C) 2002-2007 Rémi Denis-Courmont
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* Copyright (C) 2011 KO Myung-Hun
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*
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* Authors: KO Myung-Hun <komh@chollian.net>
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* Rémi Denis-Courmont
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_network.h>
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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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#define _NI_MASK (NI_NUMERICHOST|NI_NUMERICSERV|NI_NOFQDN|NI_NAMEREQD|\
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NI_DGRAM)
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/*
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* getnameinfo() non-thread-safe IPv4-only implementation,
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* Address-family-independent address to hostname translation
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* (reverse DNS lookup in case of IPv4).
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*
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* This is meant for use on old IP-enabled systems that are not IPv6-aware,
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* and probably do not have getnameinfo(), but have the old gethostbyaddr()
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* function.
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*/
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int
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getnameinfo (const struct sockaddr *sa, socklen_t salen,
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char *host, int hostlen, char *serv, int servlen, int flags)
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{
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if (((size_t)salen < sizeof (struct sockaddr_in))
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|| (sa->sa_family != AF_INET))
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return EAI_FAMILY;
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else if (flags & (~_NI_MASK))
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return EAI_BADFLAGS;
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else
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{
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const struct sockaddr_in *addr;
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addr = (const struct sockaddr_in *)sa;
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if (host != NULL)
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{
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/* host name resolution */
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if (!(flags & NI_NUMERICHOST))
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{
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if (flags & NI_NAMEREQD)
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return EAI_NONAME;
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}
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/* inet_ntoa() is not thread-safe, do not use it */
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uint32_t ipv4 = ntohl (addr->sin_addr.s_addr);
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if (snprintf (host, hostlen, "%u.%u.%u.%u", ipv4 >> 24,
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(ipv4 >> 16) & 0xff, (ipv4 >> 8) & 0xff,
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ipv4 & 0xff) >= (int)hostlen)
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return EAI_OVERFLOW;
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}
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if (serv != NULL)
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{
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if (snprintf (serv, servlen, "%u",
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(unsigned int)ntohs (addr->sin_port)) >= (int)servlen)
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return EAI_OVERFLOW;
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}
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}
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return 0;
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}
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#define _AI_MASK (AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST)
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/*
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* Converts the current herrno error value into an EAI_* error code.
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* That error code is normally returned by getnameinfo() or getaddrinfo().
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*/
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static int
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gai_error_from_herrno (void)
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{
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switch (h_errno)
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{
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case HOST_NOT_FOUND:
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return EAI_NONAME;
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case NO_ADDRESS:
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# if (NO_ADDRESS != NO_DATA)
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case NO_DATA:
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# endif
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return EAI_NODATA;
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case NO_RECOVERY:
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return EAI_FAIL;
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case TRY_AGAIN:
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return EAI_AGAIN;
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}
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return EAI_SYSTEM;
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}
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/*
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* Internal function that builds an addrinfo struct.
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*/
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static struct addrinfo *
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makeaddrinfo (int af, int type, int proto,
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const struct sockaddr *addr, size_t addrlen,
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const char *canonname)
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{
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struct addrinfo *res;
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res = (struct addrinfo *)malloc (sizeof (struct addrinfo));
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if (res != NULL)
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{
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res->ai_flags = 0;
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res->ai_family = af;
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res->ai_socktype = type;
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res->ai_protocol = proto;
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res->ai_addrlen = addrlen;
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res->ai_addr = malloc (addrlen);
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res->ai_canonname = NULL;
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res->ai_next = NULL;
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if (res->ai_addr != NULL)
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{
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memcpy (res->ai_addr, addr, addrlen);
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if (canonname != NULL)
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{
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res->ai_canonname = strdup (canonname);
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if (res->ai_canonname != NULL)
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return res; /* success ! */
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}
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else
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return res;
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}
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}
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/* failsafe */
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freeaddrinfo (res);
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return NULL;
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}
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static struct addrinfo *
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makeipv4info (int type, int proto, u_long ip, u_short port, const char *name)
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{
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struct sockaddr_in addr;
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memset (&addr, 0, sizeof (addr));
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addr.sin_family = AF_INET;
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# ifdef HAVE_SA_LEN
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addr.sin_len = sizeof (addr);
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# endif
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addr.sin_port = port;
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addr.sin_addr.s_addr = ip;
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return makeaddrinfo (AF_INET, type, proto,
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(struct sockaddr*)&addr, sizeof (addr), name);
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}
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/*
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* getaddrinfo() non-thread-safe IPv4-only implementation
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* Address-family-independent hostname to address resolution.
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*
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* This is meant for IPv6-unaware systems that do probably not provide
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* getaddrinfo(), but still have old function gethostbyname().
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*
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* Only UDP and TCP over IPv4 are supported here.
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*/
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int
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getaddrinfo (const char *node, const char *service,
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const struct addrinfo *hints, struct addrinfo **res)
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{
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struct addrinfo *info;
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u_long ip;
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u_short port;
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int protocol = 0, flags = 0;
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const char *name = NULL;
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if (hints != NULL)
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{
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flags = hints->ai_flags;
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if (flags & ~_AI_MASK)
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return EAI_BADFLAGS;
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/* only accept AF_INET and AF_UNSPEC */
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if (hints->ai_family && (hints->ai_family != AF_INET))
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return EAI_FAMILY;
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/* protocol sanity check */
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switch (hints->ai_socktype)
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{
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case SOCK_STREAM:
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protocol = IPPROTO_TCP;
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break;
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case SOCK_DGRAM:
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protocol = IPPROTO_UDP;
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break;
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#ifdef SOCK_RAW
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case SOCK_RAW:
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#endif
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case 0:
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break;
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default:
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return EAI_SOCKTYPE;
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}
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if (hints->ai_protocol && protocol
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&& (protocol != hints->ai_protocol))
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return EAI_SERVICE;
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}
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*res = NULL;
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/* default values */
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if (node == NULL)
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{
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if (flags & AI_PASSIVE)
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ip = htonl (INADDR_ANY);
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else
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ip = htonl (INADDR_LOOPBACK);
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}
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else
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if ((ip = inet_addr (node)) == INADDR_NONE)
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{
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struct hostent *entry = NULL;
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/* hostname resolution */
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if (!(flags & AI_NUMERICHOST))
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entry = gethostbyname (node);
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if (entry == NULL)
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return gai_error_from_herrno ();
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if ((entry->h_length != 4) || (entry->h_addrtype != AF_INET))
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return EAI_FAMILY;
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ip = *((u_long *) entry->h_addr);
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if (flags & AI_CANONNAME)
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name = entry->h_name;
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}
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if ((flags & AI_CANONNAME) && (name == NULL))
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name = node;
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/* service resolution */
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if (service == NULL)
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port = 0;
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else
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{
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unsigned long d;
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char *end;
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d = strtoul (service, &end, 0);
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if (end[0] || (d > 65535u))
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return EAI_SERVICE;
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port = htons ((u_short)d);
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}
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/* building results... */
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if ((!protocol) || (protocol == IPPROTO_UDP))
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{
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info = makeipv4info (SOCK_DGRAM, IPPROTO_UDP, ip, port, name);
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if (info == NULL)
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{
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errno = ENOMEM;
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return EAI_SYSTEM;
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}
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if (flags & AI_PASSIVE)
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info->ai_flags |= AI_PASSIVE;
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*res = info;
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}
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if ((!protocol) || (protocol == IPPROTO_TCP))
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{
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info = makeipv4info (SOCK_STREAM, IPPROTO_TCP, ip, port, name);
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if (info == NULL)
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{
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errno = ENOMEM;
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return EAI_SYSTEM;
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}
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info->ai_next = *res;
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if (flags & AI_PASSIVE)
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info->ai_flags |= AI_PASSIVE;
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*res = info;
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}
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return 0;
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}
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