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
28 #include <sys/types.h>
29 #include <sys/socket.h>
30 #include <sys/sysctl.h>
31 #include <sys/uio.h>
32
33 #include <netinet/in.h>
34
35 #include <err.h>
36 #include <errno.h>
37 #include <fcntl.h>
38 #include <pthread.h>
39 #include <stdbool.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <unistd.h>
44
45 static char buf[1024*1024];
46 ssize_t readlen;
47 static volatile bool read_done = false;
48
49 static int
tcp_socketpair(int * sv)50 tcp_socketpair(int *sv)
51 {
52 struct sockaddr_in sin = {
53 .sin_len = sizeof(struct sockaddr_in),
54 .sin_family = AF_INET,
55 .sin_addr.s_addr = htonl(INADDR_LOOPBACK),
56 };
57 int flags;
58 int ls;
59
60 ls = socket(PF_INET, SOCK_STREAM, 0);
61 if (ls < 0)
62 err(1, "socket ls");
63
64 if (setsockopt(ls, SOL_SOCKET, SO_REUSEADDR, &(socklen_t){1},
65 sizeof(int)) < 0)
66 err(1, "SO_REUSEADDR");
67
68 if (bind(ls, (struct sockaddr *)&sin, sizeof(sin)) < 0)
69 err(1, "bind ls");
70
71 if (getsockname(ls, (struct sockaddr *)&sin,
72 &(socklen_t){ sizeof(sin) }) < 0)
73 err(1, "getsockname");
74
75 if (listen(ls, 5) < 0)
76 err(1, "listen ls");
77
78 sv[0] = socket(PF_INET, SOCK_STREAM, 0);
79 if (sv[0] < 0)
80 err(1, "socket cs");
81
82 flags = fcntl(sv[0], F_GETFL);
83 flags |= O_NONBLOCK;
84 if (fcntl(sv[0], F_SETFL, flags) == -1)
85 err(1, "fcntl +O_NONBLOCK");
86
87 if (connect(sv[0], (void *)&sin, sizeof(sin)) == -1 &&
88 errno != EINPROGRESS)
89 err(1, "connect cs");
90
91 sv[1] = accept(ls, NULL, 0);
92 if (sv[1] < 0)
93 err(1, "accept ls");
94
95 flags &= ~O_NONBLOCK;
96 if (fcntl(sv[0], F_SETFL, flags) == -1)
97 err(1, "fcntl -O_NONBLOCK");
98
99 close(ls);
100
101 return (0);
102 }
103
104 static void *
receiver(void * arg)105 receiver(void *arg)
106 {
107 int s = *(int *)arg;
108 ssize_t rv;
109
110 do {
111 rv = read(s, buf, sizeof(buf));
112 if (rv == -1)
113 err(2, "read receiver");
114 if (rv == 0)
115 break;
116 readlen -= rv;
117 } while (readlen != 0);
118
119 read_done = true;
120
121 return NULL;
122 }
123
124 static void
usage(void)125 usage(void)
126 {
127 errx(1, "usage: %s [-u] <file> <start> <len> <flags>", getprogname());
128 }
129
130 int
main(int argc,char ** argv)131 main(int argc, char **argv)
132 {
133 pthread_t pt;
134 off_t start;
135 int ch, fd, ss[2], flags, error;
136 bool pf_unix = false;
137
138 while ((ch = getopt(argc, argv, "u")) != -1)
139 switch (ch) {
140 case 'u':
141 pf_unix = true;
142 break;
143 default:
144 usage();
145 }
146 argc -= optind;
147 argv += optind;
148
149 if (argc != 4)
150 usage();
151
152 start = strtoull(argv[1], NULL, 0);
153 readlen = strtoull(argv[2], NULL, 0);
154 flags = strtoul(argv[3], NULL, 0);
155
156 fd = open(argv[0], O_RDONLY);
157 if (fd < 0)
158 err(1, "open");
159
160 if (pf_unix) {
161 if (socketpair(PF_LOCAL, SOCK_STREAM, 0, ss) != 0)
162 err(1, "socketpair");
163 } else
164 tcp_socketpair(ss);
165
166 error = pthread_create(&pt, NULL, receiver, &ss[1]);
167 if (error)
168 errc(1, error, "pthread_create");
169
170 if (sendfile(fd, ss[0], start, readlen, NULL, NULL, flags) < 0)
171 err(3, "sendfile");
172
173 while (!read_done)
174 usleep(1000);
175
176 exit(0);
177 }
178