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/**
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* Copyright (c) 2013, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file nextwork-extension-functions.cc
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*/
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <sys/socket.h>
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#include "auto_mem.hh"
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#include "config.h"
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#include "sqlite-extension-func.hh"
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#include "sqlite3.h"
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#include "vtab_module.hh"
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static std::string
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sql_gethostbyname(const char* name_in)
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{
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char buffer[INET6_ADDRSTRLEN];
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auto_mem<struct addrinfo> ai(freeaddrinfo);
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void* addr_ptr = nullptr;
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struct addrinfo hints;
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int rc;
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memset(&hints, 0, sizeof(hints));
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for (auto family : {AF_INET, AF_INET6}) {
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hints.ai_family = family;
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while ((rc = getaddrinfo(name_in, nullptr, &hints, ai.out()))
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== EAI_AGAIN) {
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sqlite3_sleep(10);
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}
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if (rc != 0) {
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return name_in;
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}
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switch (ai.in()->ai_family) {
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case AF_INET:
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addr_ptr = &((struct sockaddr_in*) ai.in()->ai_addr)->sin_addr;
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break;
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case AF_INET6:
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addr_ptr
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= &((struct sockaddr_in6*) ai.in()->ai_addr)->sin6_addr;
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break;
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default:
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return name_in;
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}
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inet_ntop(ai.in()->ai_family, addr_ptr, buffer, sizeof(buffer));
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break;
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}
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return buffer;
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}
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static std::string
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sql_gethostbyaddr(const char* addr_str)
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{
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union {
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struct sockaddr_in sin;
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struct sockaddr_in6 sin6;
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} sa;
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char buffer[NI_MAXHOST];
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int family, socklen;
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char* addr_raw;
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int rc;
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memset(&sa, 0, sizeof(sa));
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if (strchr(addr_str, ':')) {
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family = AF_INET6;
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socklen = sizeof(struct sockaddr_in6);
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sa.sin6.sin6_family = family;
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addr_raw = (char*) &sa.sin6.sin6_addr;
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} else {
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family = AF_INET;
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socklen = sizeof(struct sockaddr_in);
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sa.sin.sin_family = family;
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addr_raw = (char*) &sa.sin.sin_addr;
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}
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if (inet_pton(family, addr_str, addr_raw) != 1) {
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return addr_str;
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}
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while ((rc = getnameinfo((struct sockaddr*) &sa,
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socklen,
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buffer,
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sizeof(buffer),
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NULL,
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0,
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0))
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== EAI_AGAIN)
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{
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sqlite3_sleep(10);
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}
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if (rc != 0) {
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return addr_str;
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}
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return buffer;
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}
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int
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network_extension_functions(struct FuncDef** basic_funcs,
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struct FuncDefAgg** agg_funcs)
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{
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static struct FuncDef network_funcs[] = {
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sqlite_func_adapter<decltype(&sql_gethostbyname), sql_gethostbyname>::
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builder(
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help_text("gethostbyname",
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"Get the IP address for the given hostname")
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.sql_function()
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.with_parameter({"hostname", "The DNS hostname to lookup."})
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.with_tags({"net"})
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.with_example({
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"To get the IP address for 'localhost'",
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"SELECT gethostbyname('localhost')",
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})),
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sqlite_func_adapter<decltype(&sql_gethostbyaddr), sql_gethostbyaddr>::
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builder(
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help_text("gethostbyaddr",
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"Get the hostname for the given IP address")
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.sql_function()
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.with_parameter({"hostname", "The IP address to lookup."})
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.with_tags({"net"})
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.with_example({
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"To get the hostname for the IP '127.0.0.1'",
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"SELECT gethostbyaddr('127.0.0.1')",
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})),
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{nullptr},
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};
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*basic_funcs = network_funcs;
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return SQLITE_OK;
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}
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