1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2020 Netflix, Inc.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * $FreeBSD$
28 */
29
30#include <sys/types.h>
31#include <sys/socket.h>
32#include <sys/sysctl.h>
33#include <sys/uio.h>
34
35#include <netinet/in.h>
36
37#include <err.h>
38#include <errno.h>
39#include <fcntl.h>
40#include <pthread.h>
41#include <stdbool.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <unistd.h>
46
47static int ls;
48static char buf[1024*1024];
49static volatile bool accept_done = false;
50static volatile bool read_done = false;
51
52static void *
53server(void *arg)
54{
55	struct sockaddr_in sin;
56	ssize_t rv;
57	socklen_t slen;
58	int ss;
59	ssize_t readlen = (uintptr_t)arg;
60
61	slen = sizeof(sin);
62	ss = accept(ls, (void *)&sin, &slen);
63	if (ss < 0)
64		err(1, "accept ls");
65
66	accept_done = true;
67
68	do {
69		rv = read(ss, buf, sizeof(buf));
70		if (rv == -1)
71			err(2, "read receiver");
72		if (rv == 0)
73			break;
74		readlen -= rv;
75	} while (readlen != 0);
76
77	read_done = true;
78
79	return NULL;
80}
81
82int
83main(int argc, char **argv)
84{
85	pthread_t pt;
86	struct sockaddr_in sin;
87	off_t start, len;
88	socklen_t slen;
89	int fd, cs, on, flags, error;
90
91	if (argc != 5)
92		errx(1, "usage: %s <file> <start> <len> <flags>",
93		    getprogname());
94
95	start = strtoull(argv[2], NULL, 0);
96	len = strtoull(argv[3], NULL, 0);
97	flags = strtoul(argv[4], NULL, 0);
98
99	fd = open(argv[1], O_RDONLY);
100	if (fd < 0)
101		err(1, "open");
102
103	ls = socket(PF_INET, SOCK_STREAM, 0);
104	if (ls < 0)
105		err(1, "socket ls");
106
107	on = 1;
108	if (setsockopt(ls, SOL_SOCKET, SO_REUSEADDR, (void *)&on,
109	    (socklen_t)sizeof(on)) < 0)
110		err(1, "SO_REUSEADDR");
111
112	sin.sin_len = sizeof(sin);
113	sin.sin_family = AF_INET;
114	sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
115	sin.sin_port = 0;
116	if (bind(ls, (void *)&sin, sizeof(sin)) < 0)
117		err(1, "bind ls");
118
119	slen = sizeof(sin);
120	if (getsockname(ls, (void *)&sin, &slen) < 0)
121		err(1, "getsockname");
122
123	if (listen(ls, 5) < 0)
124		err(1, "listen ls");
125
126	error = pthread_create(&pt, NULL, server, (void *)(uintptr_t)len);
127	if (error)
128		errc(1, error, "pthread_create");
129
130	cs = socket(PF_INET, SOCK_STREAM, 0);
131	if (cs < 0)
132		err(1, "socket cs");
133
134	if (connect(cs, (void *)&sin, sizeof(sin)) < 0)
135		err(1, "connect cs");
136
137	while (!accept_done)
138		usleep(1000);
139
140	if (sendfile(fd, cs, start, len, NULL, NULL, flags) < 0)
141		err(3, "sendfile");
142
143	while (!read_done)
144		usleep(1000);
145
146	exit(0);
147}
148