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/*
* Copyright 2007-2018 Content Management AG
* All rights reserved.
*
* author: Max Kellermann <mk@cm4all.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Resolver.hxx"
#include "AddressInfo.hxx"
#include "HostParser.hxx"
#include "util/RuntimeError.hxx"
#include "util/CharUtil.hxx"
#ifdef _WIN32
#include <ws2tcpip.h>
#else
#include <sys/socket.h>
#include <netdb.h>
#include <net/if.h>
#endif
#include <cerrno>
#include <cstring>
#include <stdio.h>
static inline bool
ai_is_passive(const struct addrinfo *ai)
{
return ai == nullptr || (ai->ai_flags & AI_PASSIVE) != 0;
}
#ifndef _WIN32
/**
* Check if there is an interface name after '%', and if so, replace
* it with the interface index, because getaddrinfo() understands only
* the index, not the name (tested on Linux/glibc).
*/
static void
FindAndResolveInterfaceName(char *host, size_t size)
{
char *percent = std::strchr(host, '%');
if (percent == nullptr || percent + 64 > host + size)
return;
char *interface = percent + 1;
if (!IsAlphaASCII(*interface))
return;
const unsigned i = if_nametoindex(interface);
if (i == 0)
throw FormatRuntimeError("No such interface: %s", interface);
sprintf(interface, "%u", i);
}
#endif
static int
Resolve(const char *host_and_port, int default_port,
const struct addrinfo *hints,
struct addrinfo **ai_r)
{
const char *host, *port;
char buffer[256], port_string[16];
if (host_and_port != nullptr) {
const auto eh = ExtractHost(host_and_port);
if (eh.HasFailed())
return EAI_NONAME;
if (eh.host.size >= sizeof(buffer)) {
#ifdef _WIN32
return EAI_MEMORY;
#else
errno = ENAMETOOLONG;
return EAI_SYSTEM;
#endif
}
memcpy(buffer, eh.host.data, eh.host.size);
buffer[eh.host.size] = 0;
host = buffer;
#ifndef _WIN32
FindAndResolveInterfaceName(buffer, sizeof(buffer));
#endif
port = eh.end;
if (*port == ':') {
/* port specified */
++port;
} else if (*port == 0) {
/* no port specified */
snprintf(port_string, sizeof(port_string), "%d", default_port);
port = port_string;
} else
throw std::runtime_error("Garbage after host name");
if (ai_is_passive(hints) && strcmp(host, "*") == 0)
host = nullptr;
} else {
host = nullptr;
snprintf(port_string, sizeof(port_string), "%d", default_port);
port = port_string;
}
return getaddrinfo(host, port, hints, ai_r);
}
AddressInfoList
Resolve(const char *host_and_port, int default_port,
const struct addrinfo *hints)
{
struct addrinfo *ai;
int result = Resolve(host_and_port, default_port, hints, &ai);
if (result != 0)
throw FormatRuntimeError("Failed to resolve '%s': %s",
host_and_port, gai_strerror(result));
return AddressInfoList(ai);
}
AddressInfoList
Resolve(const char *host_port, unsigned default_port, int flags, int socktype)
{
const auto hints = MakeAddrInfo(flags, AF_UNSPEC, socktype);
return Resolve(host_port, default_port, &hints);
}
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