1 /* 2 * Copyright (C) 2014 Linux Test Project, Inc. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of version 2 of the GNU General Public 6 * License as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it would be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 11 * 12 * Further, this software is distributed without any warranty that it 13 * is free of the rightful claim of any third person regarding 14 * infringement or the like. Any license provided herein, whether 15 * implied or otherwise, applies only to this software file. Patent 16 * licenses, if any, provided herein do not apply to combinations of 17 * this program with other software, or any other product whatsoever. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write the Free Software Foundation, Inc. 21 */ 22 23 #include <sys/types.h> 24 #include <sys/socket.h> 25 #include <netinet/in.h> 26 27 #include "test.h" 28 tst_get_unused_port(void (cleanup_fn)(void),unsigned short family,int type)29 unsigned short tst_get_unused_port(void (cleanup_fn)(void), 30 unsigned short family, int type) 31 { 32 int sock; 33 socklen_t slen; 34 struct sockaddr_storage _addr; 35 struct sockaddr *addr = (struct sockaddr *)&_addr; 36 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr; 37 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr; 38 39 switch (family) { 40 case AF_INET: 41 addr4->sin_family = AF_INET; 42 addr4->sin_port = 0; 43 addr4->sin_addr.s_addr = INADDR_ANY; 44 slen = sizeof(*addr4); 45 break; 46 47 case AF_INET6: 48 addr6->sin6_family = AF_INET6; 49 addr6->sin6_port = 0; 50 addr6->sin6_addr = in6addr_any; 51 slen = sizeof(*addr6); 52 break; 53 54 default: 55 tst_brkm(TBROK, cleanup_fn, 56 "tst_get_unused_port unknown family"); 57 return -1; 58 } 59 60 sock = socket(addr->sa_family, type, 0); 61 if (sock < 0) { 62 tst_brkm(TBROK | TERRNO, cleanup_fn, "socket failed"); 63 return -1; 64 } 65 66 if (bind(sock, addr, slen) < 0) { 67 tst_brkm(TBROK | TERRNO, cleanup_fn, "bind failed"); 68 return -1; 69 } 70 71 if (getsockname(sock, addr, &slen) == -1) { 72 tst_brkm(TBROK | TERRNO, cleanup_fn, "getsockname failed"); 73 return -1; 74 } 75 76 if (close(sock) == -1) { 77 tst_brkm(TBROK | TERRNO, cleanup_fn, "close failed"); 78 return -1; 79 } 80 81 switch (family) { 82 case AF_INET: 83 return addr4->sin_port; 84 case AF_INET6: 85 return addr6->sin6_port; 86 default: 87 return -1; 88 } 89 } 90