156 lines
4.1 KiB
C++
156 lines
4.1 KiB
C++
/*
|
|
* 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);
|
|
}
|