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 int ls; 46 static char buf[1024*1024]; 47 static volatile bool accept_done = false; 48 static volatile bool read_done = false; 49 50 static void * 51 server(void *arg) 52 { 53 struct sockaddr_in sin; 54 ssize_t rv; 55 socklen_t slen; 56 int ss; 57 ssize_t readlen = (uintptr_t)arg; 58 59 slen = sizeof(sin); 60 ss = accept(ls, (void *)&sin, &slen); 61 if (ss < 0) 62 err(1, "accept ls"); 63 64 accept_done = true; 65 66 do { 67 rv = read(ss, buf, sizeof(buf)); 68 if (rv == -1) 69 err(2, "read receiver"); 70 if (rv == 0) 71 break; 72 readlen -= rv; 73 } while (readlen != 0); 74 75 read_done = true; 76 77 return NULL; 78 } 79 80 int 81 main(int argc, char **argv) 82 { 83 pthread_t pt; 84 struct sockaddr_in sin; 85 off_t start, len; 86 socklen_t slen; 87 int fd, cs, on, flags, error; 88 89 if (argc != 5) 90 errx(1, "usage: %s <file> <start> <len> <flags>", 91 getprogname()); 92 93 start = strtoull(argv[2], NULL, 0); 94 len = strtoull(argv[3], NULL, 0); 95 flags = strtoul(argv[4], NULL, 0); 96 97 fd = open(argv[1], O_RDONLY); 98 if (fd < 0) 99 err(1, "open"); 100 101 ls = socket(PF_INET, SOCK_STREAM, 0); 102 if (ls < 0) 103 err(1, "socket ls"); 104 105 on = 1; 106 if (setsockopt(ls, SOL_SOCKET, SO_REUSEADDR, (void *)&on, 107 (socklen_t)sizeof(on)) < 0) 108 err(1, "SO_REUSEADDR"); 109 110 sin.sin_len = sizeof(sin); 111 sin.sin_family = AF_INET; 112 sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); 113 sin.sin_port = 0; 114 if (bind(ls, (void *)&sin, sizeof(sin)) < 0) 115 err(1, "bind ls"); 116 117 slen = sizeof(sin); 118 if (getsockname(ls, (void *)&sin, &slen) < 0) 119 err(1, "getsockname"); 120 121 if (listen(ls, 5) < 0) 122 err(1, "listen ls"); 123 124 error = pthread_create(&pt, NULL, server, (void *)(uintptr_t)len); 125 if (error) 126 errc(1, error, "pthread_create"); 127 128 cs = socket(PF_INET, SOCK_STREAM, 0); 129 if (cs < 0) 130 err(1, "socket cs"); 131 132 if (connect(cs, (void *)&sin, sizeof(sin)) < 0) 133 err(1, "connect cs"); 134 135 while (!accept_done) 136 usleep(1000); 137 138 if (sendfile(fd, cs, start, len, NULL, NULL, flags) < 0) 139 err(3, "sendfile"); 140 141 while (!read_done) 142 usleep(1000); 143 144 exit(0); 145 } 146