/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#include <unistd.h>

#include <isc/util.h>
#include <isc/uv.h>

#if UV_VERSION_HEX < UV_VERSION(1, 12, 0)
#include <stdlib.h>
#include <string.h>

int
uv_os_getenv(const char *name, char *buffer, size_t *size) {
	size_t len;
	char *buf = getenv(name);
	if (buf == NULL) {
		return (UV_ENOENT);
	}
	len = strlen(buf) + 1;
	if (len > *size) {
		*size = len;
		return (UV_ENOBUFS);
	}
	*size = len;
	memmove(buffer, buf, len);
	return (0);
}

#endif

#if UV_VERSION_HEX < UV_VERSION(1, 27, 0)
int
isc_uv_udp_connect(uv_udp_t *handle, const struct sockaddr *addr) {
	int err = 0;

	do {
		int addrlen = (addr->sa_family == AF_INET)
				      ? sizeof(struct sockaddr_in)
				      : sizeof(struct sockaddr_in6);
		err = connect(handle->io_watcher.fd, addr, addrlen);
	} while (err == -1 && errno == EINTR);

	if (err) {
#if UV_VERSION_HEX >= UV_VERSION(1, 10, 0)
		return (uv_translate_sys_error(errno));
#else
		return (-errno);
#endif /* UV_VERSION_HEX >= UV_VERSION(1, 10, 0) */
	}

	return (0);
}
#endif /* UV_VERSION_HEX < UV_VERSION(1, 27, 0) */

#if UV_VERSION_HEX < UV_VERSION(1, 32, 0)
int
uv_tcp_close_reset(uv_tcp_t *handle, uv_close_cb close_cb) {
	if (setsockopt(handle->io_watcher.fd, SOL_SOCKET, SO_LINGER,
		       &(struct linger){ 1, 0 }, sizeof(struct linger)) == -1)
	{
#if UV_VERSION_HEX >= UV_VERSION(1, 10, 0)
		return (uv_translate_sys_error(errno));
#else
		return (-errno);
#endif /* UV_VERSION_HEX >= UV_VERSION(1, 10, 0) */
	}

	INSIST(!uv_is_closing((uv_handle_t *)handle));
	uv_close((uv_handle_t *)handle, close_cb);
	return (0);
}
#endif /* UV_VERSION_HEX < UV_VERSION(1, 32, 0) */

#define setsockopt_on(socket, level, name) \
	setsockopt(socket, level, name, &(int){ 1 }, sizeof(int))

/*%
 * Convert a libuv error value into an isc_result_t.  The
 * list of supported error values is not complete; new users
 * of this function should add any expected errors that are
 * not already there.
 */
isc_result_t
isc__uverr2result(int uverr, bool dolog, const char *file, unsigned int line,
		  const char *func) {
	switch (uverr) {
	case 0:
		return (ISC_R_SUCCESS);
	case UV_ENOTDIR:
	case UV_ELOOP:
	case UV_EINVAL: /* XXX sometimes this is not for files */
	case UV_ENAMETOOLONG:
	case UV_EBADF:
		return (ISC_R_INVALIDFILE);
	case UV_ENOENT:
		return (ISC_R_FILENOTFOUND);
	case UV_EAGAIN:
		return (ISC_R_NOCONN);
	case UV_EACCES:
	case UV_EPERM:
		return (ISC_R_NOPERM);
	case UV_EEXIST:
		return (ISC_R_FILEEXISTS);
	case UV_EIO:
		return (ISC_R_IOERROR);
	case UV_ENOMEM:
		return (ISC_R_NOMEMORY);
	case UV_ENFILE:
	case UV_EMFILE:
		return (ISC_R_TOOMANYOPENFILES);
	case UV_ENOSPC:
		return (ISC_R_DISCFULL);
	case UV_EPIPE:
	case UV_ECONNRESET:
	case UV_ECONNABORTED:
		return (ISC_R_CONNECTIONRESET);
	case UV_ENOTCONN:
		return (ISC_R_NOTCONNECTED);
	case UV_ETIMEDOUT:
		return (ISC_R_TIMEDOUT);
	case UV_ENOBUFS:
		return (ISC_R_NORESOURCES);
	case UV_EAFNOSUPPORT:
		return (ISC_R_FAMILYNOSUPPORT);
	case UV_ENETDOWN:
		return (ISC_R_NETDOWN);
	case UV_EHOSTDOWN:
		return (ISC_R_HOSTDOWN);
	case UV_ENETUNREACH:
		return (ISC_R_NETUNREACH);
	case UV_EHOSTUNREACH:
		return (ISC_R_HOSTUNREACH);
	case UV_EADDRINUSE:
		return (ISC_R_ADDRINUSE);
	case UV_EADDRNOTAVAIL:
		return (ISC_R_ADDRNOTAVAIL);
	case UV_ECONNREFUSED:
		return (ISC_R_CONNREFUSED);
	case UV_ECANCELED:
		return (ISC_R_CANCELED);
	case UV_EOF:
		return (ISC_R_EOF);
	case UV_EMSGSIZE:
		return (ISC_R_MAXSIZE);
	case UV_ENOTSUP:
		return (ISC_R_FAMILYNOSUPPORT);
	default:
		if (dolog) {
			UNEXPECTED_ERROR(
				file, line,
				"unable to convert libuv "
				"error code in %s to isc_result: %d: %s",
				func, uverr, uv_strerror(uverr));
		}
		return (ISC_R_UNEXPECTED);
	}
}