1 /* 2 * Copyright (c) 2013-2015 Dmitry V. Levin <ldv (at) altlinux.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <assert.h> 29 #include <stddef.h> 30 #include <string.h> 31 #include <signal.h> 32 #include <unistd.h> 33 #include <sys/wait.h> 34 #include <sys/socket.h> 35 #include <sys/un.h> 36 37 static void 38 handler(int sig) 39 { 40 assert(close(1) == 0); 41 _exit(0); 42 } 43 44 int 45 main(int ac, const char **av) 46 { 47 struct sockaddr_un addr = { 48 .sun_family = AF_UNIX, 49 }; 50 socklen_t len; 51 52 assert(ac == 2); 53 assert(strlen(av[1]) > 0); 54 55 strncpy(addr.sun_path, av[1], sizeof(addr.sun_path)); 56 len = offsetof(struct sockaddr_un, sun_path) + strlen(av[1]) + 1; 57 if (len > sizeof(addr)) 58 len = sizeof(addr); 59 60 unlink(av[1]); 61 close(0); 62 close(1); 63 64 assert(socket(PF_LOCAL, SOCK_STREAM, 0) == 0); 65 assert(bind(0, (struct sockaddr *) &addr, len) == 0); 66 assert(listen(0, 5) == 0); 67 68 memset(&addr, 0, sizeof addr); 69 assert(getsockname(0, (struct sockaddr *) &addr, &len) == 0); 70 if (len > sizeof(addr)) 71 len = sizeof(addr); 72 73 pid_t pid = fork(); 74 assert(pid >= 0); 75 76 if (pid) { 77 assert(accept(0, (struct sockaddr *) &addr, &len) == 1); 78 assert(close(0) == 0); 79 assert(kill(pid, SIGUSR1) == 0); 80 int status; 81 assert(waitpid(pid, &status, 0) == pid); 82 assert(status == 0); 83 assert(close(1) == 0); 84 } else { 85 sigset_t set; 86 sigemptyset(&set); 87 sigaddset(&set, SIGUSR1); 88 89 assert(sigprocmask(SIG_BLOCK, &set, NULL) == 0); 90 assert(signal(SIGUSR1, handler) != SIG_ERR); 91 assert(socket(PF_LOCAL, SOCK_STREAM, 0) == 1); 92 assert(close(0) == 0); 93 assert(connect(1, (struct sockaddr *) &addr, len) == 0); 94 assert(sigprocmask(SIG_UNBLOCK, &set, NULL) == 0); 95 assert(pause() == 99); 96 return 1; 97 } 98 99 unlink(av[1]); 100 return 0; 101 } 102
