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/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/types.h> 31 #include <sys/socket.h> 32 #include <sys/time.h> 33 #include <sys/ioctl.h> 34 35 #include <net/if.h> 36 #include <net/if_dl.h> 37 #include <net/if_types.h> 38 #include <net/ethernet.h> 39 40 #include <err.h> 41 #include <errno.h> 42 #include <getopt.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 48 #include <ifaddrs.h> 49 50 static int dorandom = 0; 51 static int verbose = 0; 52 static char *ifname = NULL; 53 54 /* 55 * The test tool exercises IP-level socket options by interrogating the 56 * getsockopt()/setsockopt() APIs. It does not currently test that the 57 * intended semantics of each option are implemented (i.e., that setting IP 58 * options on the socket results in packets with the desired IP options in 59 * it). 60 */ 61 62 /* 63 * get_socket() is a wrapper function that returns a socket of the specified 64 * type, and created with or without restored root privilege (if running 65 * with a real uid of root and an effective uid of some other user). This 66 * us to test whether the same rights are granted using a socket with a 67 * privileged cached credential vs. a socket with a regular credential. 68 */ 69 #define PRIV_ASIS 0 70 #define PRIV_GETROOT 1 71 static int 72 get_socket_unpriv(int type) 73 { 74 75 return (socket(PF_INET, type, 0)); 76 } 77 78 static int 79 get_socket_priv(int type) 80 { 81 uid_t olduid; 82 int sock; 83 84 if (getuid() != 0) 85 errx(-1, "get_sock_priv: running without real uid 0"); 86 87 olduid = geteuid(); 88 if (seteuid(0) < 0) 89 err(-1, "get_sock_priv: seteuid(0)"); 90 91 sock = socket(PF_INET, type, 0); 92 93 if (seteuid(olduid) < 0) 94 err(-1, "get_sock_priv: seteuid(%d)", olduid); 95 96 return (sock); 97 } 98 99 static int 100 get_socket(int type, int priv) 101 { 102 103 if (priv) 104 return (get_socket_priv(type)); 105 else 106 return (get_socket_unpriv(type)); 107 } 108 109 union sockunion { 110 struct sockaddr_storage ss; 111 struct sockaddr sa; 112 struct sockaddr_dl sdl; 113 }; 114 typedef union sockunion sockunion_t; 115 116 static void 117 test_ether_multi(int sock) 118 { 119 struct ifreq ifr; 120 struct sockaddr_dl *dlp; 121 struct ether_addr ea; 122 struct ifmaddrs *ifma, *ifmap; 123 int found; 124 125 /* Choose an 802 multicast address. */ 126 if (dorandom) { 127 uint32_t mac4; 128 129 srandomdev(); 130 mac4 = random(); 131 ea.octet[0] = 0x01; 132 ea.octet[1] = 0x80; 133 ea.octet[2] = ((mac4 >> 24 & 0xFF)); 134 ea.octet[3] = ((mac4 >> 16 & 0xFF)); 135 ea.octet[4] = ((mac4 >> 8 & 0xFF)); 136 ea.octet[5] = (mac4 & 0xFF); 137 } else { 138 struct ether_addr *nep = ether_aton("01:80:DE:FA:CA:7E"); 139 ea = *nep; 140 } 141 142 /* Fill out ifreq, and fill out 802 group address. */ 143 memset(&ifr, 0, sizeof(struct ifreq)); 144 strlcpy(&ifr.ifr_name[0], ifname, IFNAMSIZ); 145 dlp = (struct sockaddr_dl *)&ifr.ifr_addr; 146 memset(dlp, 0, sizeof(struct sockaddr_dl)); 147 dlp->sdl_len = sizeof(struct sockaddr_dl); 148 dlp->sdl_family = AF_LINK; 149 dlp->sdl_alen = sizeof(struct ether_addr); 150 memcpy(LLADDR(dlp), &ea, sizeof(struct ether_addr)); 151 152 /* Join an 802 group. */ 153 if (ioctl(sock, SIOCADDMULTI, &ifr) < 0) { 154 warn("can't add ethernet multicast membership"); 155 return; 156 } 157 158 /* Check that we joined the group by calling getifmaddrs(). */ 159 found = 0; 160 if (getifmaddrs(&ifmap) != 0) { 161 warn("getifmaddrs()"); 162 } else { 163 for (ifma = ifmap; ifma; ifma = ifma->ifma_next) { 164 sockunion_t *psa = (sockunion_t *)ifma->ifma_addr; 165 if (ifma->ifma_name == NULL || psa == NULL) 166 continue; 167 168 if (psa->sa.sa_family != AF_LINK || 169 psa->sdl.sdl_alen != ETHER_ADDR_LEN) 170 continue; 171 172 if (bcmp(LLADDR(&psa->sdl), LLADDR(dlp), 173 ETHER_ADDR_LEN) == 0) { 174 found = 1; 175 break; 176 } 177 } 178 freeifmaddrs(ifmap); 179 } 180 if (!found) { 181 warnx("group membership for %s not returned by getifmaddrs()", 182 ether_ntoa(&ea)); 183 } 184 185 /* Fill out ifreq, and fill out 802 group address. */ 186 memset(&ifr, 0, sizeof(struct ifreq)); 187 strlcpy(&ifr.ifr_name[0], ifname, IFNAMSIZ); 188 dlp = (struct sockaddr_dl *)&ifr.ifr_addr; 189 memset(dlp, 0, sizeof(struct sockaddr_dl)); 190 dlp->sdl_len = sizeof(struct sockaddr_dl); 191 dlp->sdl_family = AF_LINK; 192 dlp->sdl_alen = sizeof(struct ether_addr); 193 memcpy(LLADDR(dlp), &ea, sizeof(struct ether_addr)); 194 195 /* Leave an 802 group. */ 196 if (ioctl(sock, SIOCDELMULTI, &ifr) < 0) 197 warn("can't delete ethernet multicast membership"); 198 199 } 200 201 static void 202 testsuite(int priv) 203 { 204 int sock; 205 206 sock = get_socket(SOCK_DGRAM, 0); 207 if (sock == -1) 208 err(-1, "get_socket(SOCK_DGRAM) for test_ether_multi()", priv); 209 test_ether_multi(sock); 210 close(sock); 211 } 212 213 static void 214 usage() 215 { 216 217 fprintf(stderr, "usage: ethermulti -i ifname [-r] [-v]\n"); 218 exit(EXIT_FAILURE); 219 } 220 221 int 222 main(int argc, char *argv[]) 223 { 224 int ch; 225 226 while ((ch = getopt(argc, argv, "i:rv")) != -1) { 227 switch (ch) { 228 case 'i': 229 ifname = optarg; 230 break; 231 case 'r': 232 dorandom = 1; /* introduce non-determinism */ 233 break; 234 case 'v': 235 verbose = 1; 236 break; 237 default: 238 usage(); 239 } 240 } 241 if (ifname == NULL) 242 usage(); 243 244 printf("1..1\n"); 245 if (geteuid() != 0) { 246 errx(1, "Not running as root, can't run tests as non-root"); 247 /*NOTREACHED*/ 248 } else { 249 fprintf(stderr, 250 "Running tests with ruid %d euid %d sock uid 0\n", 251 getuid(), geteuid()); 252 testsuite(PRIV_ASIS); 253 } 254 printf("ok 1 - ethermulti\n"); 255 exit(0); 256 } 257