lnav/src/network-extension-functions.cc

/**
 * Copyright (c) 2013, Timothy Stack
 *
 * All rights reserved.
 * 
 * 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.
 * * Neither the name of Timothy Stack nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 * @file nextwork-extension-functions.cc
 */

#include <stdio.h>

#include <assert.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>

#include "sqlite3.h"

static void sql_gethostbyname(sqlite3_context *context,
                              int argc, sqlite3_value **argv)
{
	char buffer[INET6_ADDRSTRLEN];
	const char *name_in;
	struct addrinfo *ai;
	void *addr_ptr;
	int rc;

	assert(argc >= 1 && argc <= 2);

	if (sqlite3_value_type(argv[0]) == SQLITE_NULL) {
		sqlite3_result_null(context);
		return;
	}

	name_in = (const char *)sqlite3_value_text(argv[0]);
	while ((rc = getaddrinfo(name_in, NULL, NULL, &ai)) == EAI_AGAIN) {
		sqlite3_sleep(10);
	}
	if (rc != 0) {
		sqlite3_result_text(context, name_in, -1, SQLITE_TRANSIENT);
		return;
	}

	switch (ai->ai_family) {
	case AF_INET:
		addr_ptr = &((struct sockaddr_in *)ai->ai_addr)->sin_addr;
		break;
	case AF_INET6:
		addr_ptr = &((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr;
		break;
	}

	inet_ntop(ai->ai_family, addr_ptr, buffer, sizeof(buffer));

	sqlite3_result_text(context, buffer, -1, SQLITE_TRANSIENT);

	freeaddrinfo(ai);
}

static void sql_gethostbyaddr(sqlite3_context *context,
                              int argc, sqlite3_value **argv)
{
	union {
		struct sockaddr_in sin;
		struct sockaddr_in6 sin6;
	} sa;
	const char *addr_str;
	char buffer[NI_MAXHOST];
	int family, socklen;
	char *addr_raw;
	int rc;

	assert(argc == 1);

	if (sqlite3_value_type(argv[0]) == SQLITE_NULL) {
		sqlite3_result_null(context);
		return;
	}

	addr_str = (const char *)sqlite3_value_text(argv[0]);

	memset(&sa, 0, sizeof(sa));
	if (strchr(addr_str, ':')) {
		family = AF_INET6;
		socklen = sizeof(struct sockaddr_in6);
		sa.sin6.sin6_family = family;
		addr_raw = (char *)&sa.sin6.sin6_addr;
	}
	else {
		family = AF_INET;
		socklen = sizeof(struct sockaddr_in);
		sa.sin.sin_family = family;
		addr_raw = (char *)&sa.sin.sin_addr;
	}

	if (inet_pton(family, addr_str, addr_raw) != 1) {
		sqlite3_result_text(context, addr_str, -1, SQLITE_TRANSIENT);
		return;
	}

	while ((rc = getnameinfo((struct sockaddr *)&sa, socklen,
	       buffer, sizeof(buffer), NULL, 0, 0)) == EAI_AGAIN) {
		sqlite3_sleep(10);
	}

	if (rc != 0) {
		sqlite3_result_text(context, addr_str, -1, SQLITE_TRANSIENT);
		return;
	}

	sqlite3_result_text(context, buffer, -1, SQLITE_TRANSIENT);
}

int register_network_extension_functions(sqlite3 *db)
{
	static const struct {
		const char *name;
		char narg;
		uint8_t text_rep;
		void (*func)(sqlite3_context*,int,sqlite3_value**);
	} plain_funcs[] = {
		{ "gethostbyname", 1, SQLITE_UTF8, sql_gethostbyname },
		{ "gethostbyaddr", 1, SQLITE_UTF8, sql_gethostbyaddr },

		{ NULL }
	};

	int retval;

	for (int lpc = 0; plain_funcs[lpc].name; lpc++) {
		retval = sqlite3_create_function(db,
		                                 plain_funcs[lpc].name,
		                                 plain_funcs[lpc].narg,
		                                 plain_funcs[lpc].text_rep,
		                                 NULL,
		                                 plain_funcs[lpc].func,
		                                 NULL,
		                                 NULL);
		if (retval != SQLITE_OK)
			return retval;
	}

	return SQLITE_OK;
}