1 /*- 2 * Copyright (c) 2007 Bruce M. Simpson 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 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/types.h> 28 #include <sys/socket.h> 29 #include <sys/time.h> 30 #include <sys/ioctl.h> 31 32 #include <net/if.h> 33 #include <net/if_dl.h> 34 #include <net/if_types.h> 35 #include <net/ethernet.h> 36 37 #include <err.h> 38 #include <errno.h> 39 #include <getopt.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <unistd.h> 44 45 #include <ifaddrs.h> 46 47 static int dorandom = 0; 48 static int verbose = 0; 49 static char *ifname = NULL; 50 51 /* 52 * The test tool exercises IP-level socket options by interrogating the 53 * getsockopt()/setsockopt() APIs. It does not currently test that the 54 * intended semantics of each option are implemented (i.e., that setting IP 55 * options on the socket results in packets with the desired IP options in 56 * it). 57 */ 58 59 /* 60 * get_socket() is a wrapper function that returns a socket of the specified 61 * type, and created with or without restored root privilege (if running 62 * with a real uid of root and an effective uid of some other user). This 63 * us to test whether the same rights are granted using a socket with a 64 * privileged cached credential vs. a socket with a regular credential. 65 */ 66 #define PRIV_ASIS 0 67 #define PRIV_GETROOT 1 68 static int 69 get_socket_unpriv(int type) 70 { 71 72 return (socket(PF_INET, type, 0)); 73 } 74 75 static int 76 get_socket_priv(int type) 77 { 78 uid_t olduid; 79 int sock; 80 81 if (getuid() != 0) 82 errx(-1, "get_sock_priv: running without real uid 0"); 83 84 olduid = geteuid(); 85 if (seteuid(0) < 0) 86 err(-1, "get_sock_priv: seteuid(0)"); 87 88 sock = socket(PF_INET, type, 0); 89 90 if (seteuid(olduid) < 0) 91 err(-1, "get_sock_priv: seteuid(%d)", olduid); 92 93 return (sock); 94 } 95 96 static int 97 get_socket(int type, int priv) 98 { 99 100 if (priv) 101 return (get_socket_priv(type)); 102 else 103 return (get_socket_unpriv(type)); 104 } 105 106 union sockunion { 107 struct sockaddr_storage ss; 108 struct sockaddr sa; 109 struct sockaddr_dl sdl; 110 }; 111 typedef union sockunion sockunion_t; 112 113 static void 114 test_ether_multi(int sock) 115 { 116 struct ifreq ifr; 117 struct sockaddr_dl *dlp; 118 struct ether_addr ea; 119 struct ifmaddrs *ifma, *ifmap; 120 int found; 121 122 /* Choose an 802 multicast address. */ 123 if (dorandom) { 124 uint32_t mac4; 125 126 srandomdev(); 127 mac4 = random(); 128 ea.octet[0] = 0x01; 129 ea.octet[1] = 0x80; 130 ea.octet[2] = ((mac4 >> 24 & 0xFF)); 131 ea.octet[3] = ((mac4 >> 16 & 0xFF)); 132 ea.octet[4] = ((mac4 >> 8 & 0xFF)); 133 ea.octet[5] = (mac4 & 0xFF); 134 } else { 135 struct ether_addr *nep = ether_aton("01:80:DE:FA:CA:7E"); 136 ea = *nep; 137 } 138 139 /* Fill out ifreq, and fill out 802 group address. */ 140 memset(&ifr, 0, sizeof(struct ifreq)); 141 strlcpy(&ifr.ifr_name[0], ifname, IFNAMSIZ); 142 dlp = (struct sockaddr_dl *)&ifr.ifr_addr; 143 memset(dlp, 0, sizeof(struct sockaddr_dl)); 144 dlp->sdl_len = sizeof(struct sockaddr_dl); 145 dlp->sdl_family = AF_LINK; 146 dlp->sdl_alen = sizeof(struct ether_addr); 147 memcpy(LLADDR(dlp), &ea, sizeof(struct ether_addr)); 148 149 /* Join an 802 group. */ 150 if (ioctl(sock, SIOCADDMULTI, &ifr) < 0) { 151 warn("can't add ethernet multicast membership"); 152 return; 153 } 154 155 /* Check that we joined the group by calling getifmaddrs(). */ 156 found = 0; 157 if (getifmaddrs(&ifmap) != 0) { 158 warn("getifmaddrs()"); 159 } else { 160 for (ifma = ifmap; ifma; ifma = ifma->ifma_next) { 161 sockunion_t *psa = (sockunion_t *)ifma->ifma_addr; 162 if (ifma->ifma_name == NULL || psa == NULL) 163 continue; 164 165 if (psa->sa.sa_family != AF_LINK || 166 psa->sdl.sdl_alen != ETHER_ADDR_LEN) 167 continue; 168 169 if (bcmp(LLADDR(&psa->sdl), LLADDR(dlp), 170 ETHER_ADDR_LEN) == 0) { 171 found = 1; 172 break; 173 } 174 } 175 freeifmaddrs(ifmap); 176 } 177 if (!found) { 178 warnx("group membership for %s not returned by getifmaddrs()", 179 ether_ntoa(&ea)); 180 } 181 182 /* Fill out ifreq, and fill out 802 group address. */ 183 memset(&ifr, 0, sizeof(struct ifreq)); 184 strlcpy(&ifr.ifr_name[0], ifname, IFNAMSIZ); 185 dlp = (struct sockaddr_dl *)&ifr.ifr_addr; 186 memset(dlp, 0, sizeof(struct sockaddr_dl)); 187 dlp->sdl_len = sizeof(struct sockaddr_dl); 188 dlp->sdl_family = AF_LINK; 189 dlp->sdl_alen = sizeof(struct ether_addr); 190 memcpy(LLADDR(dlp), &ea, sizeof(struct ether_addr)); 191 192 /* Leave an 802 group. */ 193 if (ioctl(sock, SIOCDELMULTI, &ifr) < 0) 194 warn("can't delete ethernet multicast membership"); 195 196 } 197 198 static void 199 testsuite(int priv) 200 { 201 int sock; 202 203 sock = get_socket(SOCK_DGRAM, 0); 204 if (sock == -1) 205 err(-1, "get_socket(SOCK_DGRAM) for test_ether_multi()", priv); 206 test_ether_multi(sock); 207 close(sock); 208 } 209 210 static void 211 usage() 212 { 213 214 fprintf(stderr, "usage: ethermulti -i ifname [-r] [-v]\n"); 215 exit(EXIT_FAILURE); 216 } 217 218 int 219 main(int argc, char *argv[]) 220 { 221 int ch; 222 223 while ((ch = getopt(argc, argv, "i:rv")) != -1) { 224 switch (ch) { 225 case 'i': 226 ifname = optarg; 227 break; 228 case 'r': 229 dorandom = 1; /* introduce non-determinism */ 230 break; 231 case 'v': 232 verbose = 1; 233 break; 234 default: 235 usage(); 236 } 237 } 238 if (ifname == NULL) 239 usage(); 240 241 printf("1..1\n"); 242 if (geteuid() != 0) { 243 errx(1, "Not running as root, can't run tests as non-root"); 244 /*NOTREACHED*/ 245 } else { 246 fprintf(stderr, 247 "Running tests with ruid %d euid %d sock uid 0\n", 248 getuid(), geteuid()); 249 testsuite(PRIV_ASIS); 250 } 251 printf("ok 1 - ethermulti\n"); 252 exit(0); 253 } 254