"Robert P. J. Day" | 63fc1a9 | 2006-07-02 19:47:05 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 2 | /* |
| 3 | * RFC3927 ZeroConf IPv4 Link-Local addressing |
| 4 | * (see <http://www.zeroconf.org/>) |
| 5 | * |
| 6 | * Copyright (C) 2003 by Arthur van Hoff (avh@strangeberry.com) |
| 7 | * Copyright (C) 2004 by David Brownell |
| 8 | * |
Bernhard Reutner-Fischer | 86f5c99 | 2006-01-22 22:55:11 +0000 | [diff] [blame] | 9 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 10 | */ |
| 11 | |
| 12 | /* |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 13 | * ZCIP just manages the 169.254.*.* addresses. That network is not |
| 14 | * routed at the IP level, though various proxies or bridges can |
| 15 | * certainly be used. Its naming is built over multicast DNS. |
| 16 | */ |
| 17 | |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 18 | //#define DEBUG |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 19 | |
| 20 | // TODO: |
| 21 | // - more real-world usage/testing, especially daemon mode |
| 22 | // - kernel packet filters to reduce scheduling noise |
| 23 | // - avoid silent script failures, especially under load... |
| 24 | // - link status monitoring (restart on link-up; stop on link-down) |
| 25 | |
Rob Landley | 53433b3 | 2006-06-22 22:28:29 +0000 | [diff] [blame] | 26 | #include "busybox.h" |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 27 | #include <syslog.h> |
| 28 | #include <poll.h> |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 29 | #include <sys/wait.h> |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 30 | #include <netinet/ether.h> |
| 31 | #include <net/ethernet.h> |
| 32 | #include <net/if.h> |
| 33 | #include <net/if_arp.h> |
| 34 | |
| 35 | #include <linux/if_packet.h> |
| 36 | #include <linux/sockios.h> |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 37 | |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 38 | |
Bernhard Reutner-Fischer | ec351c3 | 2005-12-13 10:28:25 +0000 | [diff] [blame] | 39 | struct arp_packet { |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 40 | struct ether_header hdr; |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 41 | struct ether_arp arp; |
Bernhard Reutner-Fischer | 86f5c99 | 2006-01-22 22:55:11 +0000 | [diff] [blame] | 42 | } ATTRIBUTE_PACKED; |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 43 | |
Rob Landley | bc68cd1 | 2006-03-10 19:22:06 +0000 | [diff] [blame] | 44 | enum { |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 45 | /* 169.254.0.0 */ |
Rob Landley | bc68cd1 | 2006-03-10 19:22:06 +0000 | [diff] [blame] | 46 | LINKLOCAL_ADDR = 0xa9fe0000, |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 47 | |
| 48 | /* protocol timeout parameters, specified in seconds */ |
Rob Landley | bc68cd1 | 2006-03-10 19:22:06 +0000 | [diff] [blame] | 49 | PROBE_WAIT = 1, |
| 50 | PROBE_MIN = 1, |
| 51 | PROBE_MAX = 2, |
| 52 | PROBE_NUM = 3, |
| 53 | MAX_CONFLICTS = 10, |
| 54 | RATE_LIMIT_INTERVAL = 60, |
| 55 | ANNOUNCE_WAIT = 2, |
| 56 | ANNOUNCE_NUM = 2, |
| 57 | ANNOUNCE_INTERVAL = 2, |
| 58 | DEFEND_INTERVAL = 10 |
| 59 | }; |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 60 | |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 61 | /* States during the configuration process. */ |
| 62 | enum { |
| 63 | PROBE = 0, |
| 64 | RATE_LIMIT_PROBE, |
| 65 | ANNOUNCE, |
| 66 | MONITOR, |
| 67 | DEFEND |
| 68 | }; |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 69 | |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 70 | #define VDBG(fmt,args...) \ |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 71 | do { } while (0) |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 72 | |
Denis Vlasenko | 67b23e6 | 2006-10-03 21:00:06 +0000 | [diff] [blame] | 73 | static unsigned opts; |
Denis Vlasenko | a9abecd | 2006-09-03 12:28:32 +0000 | [diff] [blame] | 74 | #define FOREGROUND (opts & 1) |
| 75 | #define QUIT (opts & 2) |
| 76 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 77 | /** |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 78 | * Pick a random link local IP address on 169.254/16, except that |
| 79 | * the first and last 256 addresses are reserved. |
| 80 | */ |
Rob Landley | 53433b3 | 2006-06-22 22:28:29 +0000 | [diff] [blame] | 81 | static void pick(struct in_addr *ip) |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 82 | { |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 83 | unsigned tmp; |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 84 | |
| 85 | /* use cheaper math than lrand48() mod N */ |
| 86 | do { |
| 87 | tmp = (lrand48() >> 16) & IN_CLASSB_HOST; |
| 88 | } while (tmp > (IN_CLASSB_HOST - 0x0200)); |
| 89 | ip->s_addr = htonl((LINKLOCAL_ADDR + 0x0100) + tmp); |
| 90 | } |
| 91 | |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 92 | /* TODO: we need a flag to direct bb_[p]error_msg output to stderr. */ |
| 93 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 94 | /** |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 95 | * Broadcast an ARP packet. |
| 96 | */ |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 97 | static void arp(int fd, struct sockaddr *saddr, int op, |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 98 | const struct ether_addr *source_addr, struct in_addr source_ip, |
| 99 | const struct ether_addr *target_addr, struct in_addr target_ip) |
| 100 | { |
| 101 | struct arp_packet p; |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 102 | memset(&p, 0, sizeof(p)); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 103 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 104 | // ether header |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 105 | p.hdr.ether_type = htons(ETHERTYPE_ARP); |
| 106 | memcpy(p.hdr.ether_shost, source_addr, ETH_ALEN); |
| 107 | memset(p.hdr.ether_dhost, 0xff, ETH_ALEN); |
| 108 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 109 | // arp request |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 110 | p.arp.arp_hrd = htons(ARPHRD_ETHER); |
| 111 | p.arp.arp_pro = htons(ETHERTYPE_IP); |
| 112 | p.arp.arp_hln = ETH_ALEN; |
| 113 | p.arp.arp_pln = 4; |
| 114 | p.arp.arp_op = htons(op); |
| 115 | memcpy(&p.arp.arp_sha, source_addr, ETH_ALEN); |
Denis Vlasenko | 9ab2658 | 2007-02-14 20:50:22 +0000 | [diff] [blame] | 116 | memcpy(&p.arp.arp_spa, &source_ip, sizeof(p.arp.arp_spa)); |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 117 | memcpy(&p.arp.arp_tha, target_addr, ETH_ALEN); |
Denis Vlasenko | 9ab2658 | 2007-02-14 20:50:22 +0000 | [diff] [blame] | 118 | memcpy(&p.arp.arp_tpa, &target_ip, sizeof(p.arp.arp_tpa)); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 119 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 120 | // send it |
Denis Vlasenko | 9ab2658 | 2007-02-14 20:50:22 +0000 | [diff] [blame] | 121 | if (sendto(fd, &p, sizeof(p), 0, saddr, sizeof(*saddr)) < 0) { |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 122 | bb_perror_msg("sendto"); |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 123 | //return -errno; |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 124 | } |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 125 | // Currently all callers ignore errors, that's why returns are |
| 126 | // commented out... |
| 127 | //return 0; |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 128 | } |
| 129 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 130 | /** |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 131 | * Run a script. |
| 132 | */ |
Denis Vlasenko | 89ef65f | 2007-01-29 23:43:18 +0000 | [diff] [blame] | 133 | static int run(const char *script, const char *arg, const char *intf, struct in_addr *ip) |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 134 | { |
| 135 | int pid, status; |
Denis Vlasenko | 89ef65f | 2007-01-29 23:43:18 +0000 | [diff] [blame] | 136 | const char *why; |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 137 | |
Denis Vlasenko | a9abecd | 2006-09-03 12:28:32 +0000 | [diff] [blame] | 138 | if(1) { //always true: if (script != NULL) |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 139 | VDBG("%s run %s %s\n", intf, script, arg); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 140 | if (ip != NULL) { |
| 141 | char *addr = inet_ntoa(*ip); |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 142 | setenv("ip", addr, 1); |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 143 | bb_info_msg("%s %s %s", arg, intf, addr); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | pid = vfork(); |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 147 | if (pid < 0) { // error |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 148 | why = "vfork"; |
| 149 | goto bad; |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 150 | } else if (pid == 0) { // child |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 151 | execl(script, script, arg, NULL); |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 152 | bb_perror_msg("execl"); |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 153 | _exit(EXIT_FAILURE); |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame] | 154 | } |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 155 | |
| 156 | if (waitpid(pid, &status, 0) <= 0) { |
| 157 | why = "waitpid"; |
| 158 | goto bad; |
| 159 | } |
| 160 | if (WEXITSTATUS(status) != 0) { |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 161 | bb_error_msg("script %s failed, exit=%d", |
| 162 | script, WEXITSTATUS(status)); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 163 | return -errno; |
| 164 | } |
| 165 | } |
| 166 | return 0; |
| 167 | bad: |
| 168 | status = -errno; |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 169 | bb_perror_msg("%s %s, %s", arg, intf, why); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 170 | return status; |
| 171 | } |
| 172 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 173 | |
| 174 | /** |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 175 | * Return milliseconds of random delay, up to "secs" seconds. |
| 176 | */ |
Rob Landley | 88621d7 | 2006-08-29 19:41:06 +0000 | [diff] [blame] | 177 | static unsigned ATTRIBUTE_ALWAYS_INLINE ms_rdelay(unsigned secs) |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 178 | { |
| 179 | return lrand48() % (secs * 1000); |
| 180 | } |
| 181 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 182 | /** |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 183 | * main program |
| 184 | */ |
Bernhard Reutner-Fischer | 38d6615 | 2005-10-21 10:43:11 +0000 | [diff] [blame] | 185 | |
Denis Vlasenko | 60e3dd6 | 2006-09-03 12:26:06 +0000 | [diff] [blame] | 186 | /* Used to be auto variables on main() stack, but |
| 187 | * most of them were zero-inited. Moving them to bss |
| 188 | * is more space-efficient. |
| 189 | */ |
| 190 | static const struct in_addr null_ip; // = { 0 }; |
| 191 | static const struct ether_addr null_addr; // = { {0, 0, 0, 0, 0, 0} }; |
| 192 | |
| 193 | static struct sockaddr saddr; // memset(0); |
| 194 | static struct in_addr ip; // = { 0 }; |
| 195 | static struct ifreq ifr; //memset(0); |
| 196 | |
| 197 | static char *intf; // = NULL; |
| 198 | static char *script; // = NULL; |
| 199 | static suseconds_t timeout; // = 0; // milliseconds |
| 200 | static unsigned conflicts; // = 0; |
| 201 | static unsigned nprobes; // = 0; |
| 202 | static unsigned nclaims; // = 0; |
| 203 | static int ready; // = 0; |
Denis Vlasenko | 60e3dd6 | 2006-09-03 12:26:06 +0000 | [diff] [blame] | 204 | static int verbose; // = 0; |
| 205 | static int state = PROBE; |
| 206 | |
Denis Vlasenko | 06af216 | 2007-02-03 17:28:39 +0000 | [diff] [blame] | 207 | int zcip_main(int argc, char *argv[]); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 208 | int zcip_main(int argc, char *argv[]) |
| 209 | { |
Denis Vlasenko | 60e3dd6 | 2006-09-03 12:26:06 +0000 | [diff] [blame] | 210 | struct ether_addr eth_addr; |
Denis Vlasenko | 89ef65f | 2007-01-29 23:43:18 +0000 | [diff] [blame] | 211 | const char *why; |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 212 | int fd; |
Denis Vlasenko | 035aae5 | 2006-09-03 12:23:56 +0000 | [diff] [blame] | 213 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 214 | // parse commandline: prog [options] ifname script |
Denis Vlasenko | 65dbd87 | 2006-09-03 12:27:25 +0000 | [diff] [blame] | 215 | char *r_opt; |
Denis Vlasenko | 67b23e6 | 2006-10-03 21:00:06 +0000 | [diff] [blame] | 216 | opt_complementary = "vv:vf"; // -v accumulates and implies -f |
| 217 | opts = getopt32(argc, argv, "fqr:v", &r_opt, &verbose); |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 218 | if (!FOREGROUND) { |
| 219 | /* Do it early, before all bb_xx_msg calls */ |
| 220 | logmode = LOGMODE_SYSLOG; |
Denis Vlasenko | 8f8f268 | 2006-10-03 21:00:43 +0000 | [diff] [blame] | 221 | openlog(applet_name, 0, LOG_DAEMON); |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 222 | } |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 223 | if (opts & 4) { // -r n.n.n.n |
Denis Vlasenko | 65dbd87 | 2006-09-03 12:27:25 +0000 | [diff] [blame] | 224 | if (inet_aton(r_opt, &ip) == 0 |
Denis Vlasenko | 9af7c9d | 2007-01-19 21:19:35 +0000 | [diff] [blame] | 225 | || (ntohl(ip.s_addr) & IN_CLASSB_NET) != LINKLOCAL_ADDR |
| 226 | ) { |
Denis Vlasenko | 65dbd87 | 2006-09-03 12:27:25 +0000 | [diff] [blame] | 227 | bb_error_msg_and_die("invalid link address"); |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 228 | } |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 229 | } |
Denis Vlasenko | 65dbd87 | 2006-09-03 12:27:25 +0000 | [diff] [blame] | 230 | argc -= optind; |
| 231 | argv += optind; |
| 232 | if (argc != 2) |
Rob Landley | 53433b3 | 2006-06-22 22:28:29 +0000 | [diff] [blame] | 233 | bb_show_usage(); |
Denis Vlasenko | 65dbd87 | 2006-09-03 12:27:25 +0000 | [diff] [blame] | 234 | intf = argv[0]; |
| 235 | script = argv[1]; |
| 236 | setenv("interface", intf, 1); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 237 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 238 | // initialize the interface (modprobe, ifup, etc) |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 239 | if (run(script, "init", intf, NULL) < 0) |
| 240 | return EXIT_FAILURE; |
| 241 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 242 | // initialize saddr |
Denis Vlasenko | 9ab2658 | 2007-02-14 20:50:22 +0000 | [diff] [blame] | 243 | //memset(&saddr, 0, sizeof(saddr)); |
| 244 | safe_strncpy(saddr.sa_data, intf, sizeof(saddr.sa_data)); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 245 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 246 | // open an ARP socket |
Denis Vlasenko | 035aae5 | 2006-09-03 12:23:56 +0000 | [diff] [blame] | 247 | fd = xsocket(PF_PACKET, SOCK_PACKET, htons(ETH_P_ARP)); |
| 248 | // bind to the interface's ARP socket |
Denis Vlasenko | 9ab2658 | 2007-02-14 20:50:22 +0000 | [diff] [blame] | 249 | xbind(fd, &saddr, sizeof(saddr)); |
Denis Vlasenko | 035aae5 | 2006-09-03 12:23:56 +0000 | [diff] [blame] | 250 | |
| 251 | // get the interface's ethernet address |
Denis Vlasenko | 9ab2658 | 2007-02-14 20:50:22 +0000 | [diff] [blame] | 252 | //memset(&ifr, 0, sizeof(ifr)); |
| 253 | strncpy(ifr.ifr_name, intf, sizeof(ifr.ifr_name)); |
Denis Vlasenko | 035aae5 | 2006-09-03 12:23:56 +0000 | [diff] [blame] | 254 | if (ioctl(fd, SIOCGIFHWADDR, &ifr) < 0) { |
Denis Vlasenko | 65dbd87 | 2006-09-03 12:27:25 +0000 | [diff] [blame] | 255 | bb_perror_msg_and_die("get ethernet address"); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 256 | } |
Denis Vlasenko | 60e3dd6 | 2006-09-03 12:26:06 +0000 | [diff] [blame] | 257 | memcpy(ð_addr, &ifr.ifr_hwaddr.sa_data, ETH_ALEN); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 258 | |
Denis Vlasenko | 035aae5 | 2006-09-03 12:23:56 +0000 | [diff] [blame] | 259 | // start with some stable ip address, either a function of |
| 260 | // the hardware address or else the last address we used. |
| 261 | // NOTE: the sequence of addresses we try changes only |
| 262 | // depending on when we detect conflicts. |
Denis Vlasenko | 60e3dd6 | 2006-09-03 12:26:06 +0000 | [diff] [blame] | 263 | // (SVID 3 bogon: who says that "short" is always 16 bits?) |
| 264 | seed48( (unsigned short*)&ifr.ifr_hwaddr.sa_data ); |
Denis Vlasenko | 035aae5 | 2006-09-03 12:23:56 +0000 | [diff] [blame] | 265 | if (ip.s_addr == 0) |
| 266 | pick(&ip); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 267 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 268 | // FIXME cases to handle: |
| 269 | // - zcip already running! |
| 270 | // - link already has local address... just defend/update |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 271 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 272 | // daemonize now; don't delay system startup |
Denis Vlasenko | 65dbd87 | 2006-09-03 12:27:25 +0000 | [diff] [blame] | 273 | if (!FOREGROUND) { |
Denis Vlasenko | cad04ef | 2007-03-25 23:21:05 +0000 | [diff] [blame] | 274 | //NOMMU |
Denis Vlasenko | 5a14202 | 2007-03-26 13:20:54 +0000 | [diff] [blame^] | 275 | bb_daemonize(DAEMON_CHDIR_ROOT); |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 276 | bb_info_msg("start, interface %s", intf); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 277 | } |
| 278 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 279 | // run the dynamic address negotiation protocol, |
| 280 | // restarting after address conflicts: |
| 281 | // - start with some address we want to try |
| 282 | // - short random delay |
| 283 | // - arp probes to see if another host else uses it |
| 284 | // - arp announcements that we're claiming it |
| 285 | // - use it |
| 286 | // - defend it, within limits |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 287 | while (1) { |
| 288 | struct pollfd fds[1]; |
| 289 | struct timeval tv1; |
| 290 | struct arp_packet p; |
| 291 | |
Denis Vlasenko | 60e3dd6 | 2006-09-03 12:26:06 +0000 | [diff] [blame] | 292 | int source_ip_conflict = 0; |
| 293 | int target_ip_conflict = 0; |
| 294 | |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 295 | fds[0].fd = fd; |
| 296 | fds[0].events = POLLIN; |
| 297 | fds[0].revents = 0; |
| 298 | |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame] | 299 | // poll, being ready to adjust current timeout |
Rob Landley | 00c051e | 2006-06-30 14:05:19 +0000 | [diff] [blame] | 300 | if (!timeout) { |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 301 | timeout = ms_rdelay(PROBE_WAIT); |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 302 | // FIXME setsockopt(fd, SO_ATTACH_FILTER, ...) to |
| 303 | // make the kernel filter out all packets except |
| 304 | // ones we'd care about. |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 305 | } |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 306 | // set tv1 to the point in time when we timeout |
Rob Landley | 00c051e | 2006-06-30 14:05:19 +0000 | [diff] [blame] | 307 | gettimeofday(&tv1, NULL); |
| 308 | tv1.tv_usec += (timeout % 1000) * 1000; |
| 309 | while (tv1.tv_usec > 1000000) { |
| 310 | tv1.tv_usec -= 1000000; |
| 311 | tv1.tv_sec++; |
| 312 | } |
| 313 | tv1.tv_sec += timeout / 1000; |
Denis Vlasenko | 9213a9e | 2006-09-17 16:28:10 +0000 | [diff] [blame] | 314 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 315 | VDBG("...wait %ld %s nprobes=%d, nclaims=%d\n", |
| 316 | timeout, intf, nprobes, nclaims); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 317 | switch (poll(fds, 1, timeout)) { |
| 318 | |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 319 | // timeout |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 320 | case 0: |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 321 | VDBG("state = %d\n", state); |
| 322 | switch (state) { |
| 323 | case PROBE: |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 324 | // timeouts in the PROBE state mean no conflicting ARP packets |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 325 | // have been received, so we can progress through the states |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 326 | if (nprobes < PROBE_NUM) { |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 327 | nprobes++; |
| 328 | VDBG("probe/%d %s@%s\n", |
| 329 | nprobes, intf, inet_ntoa(ip)); |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 330 | arp(fd, &saddr, ARPOP_REQUEST, |
Denis Vlasenko | 60e3dd6 | 2006-09-03 12:26:06 +0000 | [diff] [blame] | 331 | ð_addr, null_ip, |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 332 | &null_addr, ip); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 333 | timeout = PROBE_MIN * 1000; |
| 334 | timeout += ms_rdelay(PROBE_MAX |
| 335 | - PROBE_MIN); |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 336 | } |
| 337 | else { |
| 338 | // Switch to announce state. |
| 339 | state = ANNOUNCE; |
| 340 | nclaims = 0; |
| 341 | VDBG("announce/%d %s@%s\n", |
| 342 | nclaims, intf, inet_ntoa(ip)); |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 343 | arp(fd, &saddr, ARPOP_REQUEST, |
Denis Vlasenko | 60e3dd6 | 2006-09-03 12:26:06 +0000 | [diff] [blame] | 344 | ð_addr, ip, |
| 345 | ð_addr, ip); |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 346 | timeout = ANNOUNCE_INTERVAL * 1000; |
| 347 | } |
| 348 | break; |
| 349 | case RATE_LIMIT_PROBE: |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 350 | // timeouts in the RATE_LIMIT_PROBE state mean no conflicting ARP packets |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 351 | // have been received, so we can move immediately to the announce state |
| 352 | state = ANNOUNCE; |
| 353 | nclaims = 0; |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 354 | VDBG("announce/%d %s@%s\n", |
| 355 | nclaims, intf, inet_ntoa(ip)); |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 356 | arp(fd, &saddr, ARPOP_REQUEST, |
Denis Vlasenko | 60e3dd6 | 2006-09-03 12:26:06 +0000 | [diff] [blame] | 357 | ð_addr, ip, |
| 358 | ð_addr, ip); |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 359 | timeout = ANNOUNCE_INTERVAL * 1000; |
| 360 | break; |
| 361 | case ANNOUNCE: |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 362 | // timeouts in the ANNOUNCE state mean no conflicting ARP packets |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 363 | // have been received, so we can progress through the states |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 364 | if (nclaims < ANNOUNCE_NUM) { |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 365 | nclaims++; |
| 366 | VDBG("announce/%d %s@%s\n", |
| 367 | nclaims, intf, inet_ntoa(ip)); |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 368 | arp(fd, &saddr, ARPOP_REQUEST, |
Denis Vlasenko | 60e3dd6 | 2006-09-03 12:26:06 +0000 | [diff] [blame] | 369 | ð_addr, ip, |
| 370 | ð_addr, ip); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 371 | timeout = ANNOUNCE_INTERVAL * 1000; |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 372 | } |
| 373 | else { |
| 374 | // Switch to monitor state. |
| 375 | state = MONITOR; |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 376 | // link is ok to use earlier |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 377 | // FIXME update filters |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 378 | run(script, "config", intf, &ip); |
| 379 | ready = 1; |
| 380 | conflicts = 0; |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 381 | timeout = -1; // Never timeout in the monitor state. |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 382 | |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 383 | // NOTE: all other exit paths |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 384 | // should deconfig ... |
Denis Vlasenko | 65dbd87 | 2006-09-03 12:27:25 +0000 | [diff] [blame] | 385 | if (QUIT) |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 386 | return EXIT_SUCCESS; |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 387 | } |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 388 | break; |
| 389 | case DEFEND: |
| 390 | // We won! No ARP replies, so just go back to monitor. |
| 391 | state = MONITOR; |
| 392 | timeout = -1; |
| 393 | conflicts = 0; |
| 394 | break; |
| 395 | default: |
| 396 | // Invalid, should never happen. Restart the whole protocol. |
| 397 | state = PROBE; |
| 398 | pick(&ip); |
| 399 | timeout = 0; |
| 400 | nprobes = 0; |
| 401 | nclaims = 0; |
| 402 | break; |
| 403 | } // switch (state) |
| 404 | break; // case 0 (timeout) |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 405 | // packets arriving |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 406 | case 1: |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 407 | // We need to adjust the timeout in case we didn't receive |
| 408 | // a conflicting packet. |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 409 | if (timeout > 0) { |
| 410 | struct timeval tv2; |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 411 | |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 412 | gettimeofday(&tv2, NULL); |
| 413 | if (timercmp(&tv1, &tv2, <)) { |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 414 | // Current time is greater than the expected timeout time. |
| 415 | // Should never happen. |
| 416 | VDBG("missed an expected timeout\n"); |
Paul Fox | ef81ce6 | 2006-03-29 23:01:33 +0000 | [diff] [blame] | 417 | timeout = 0; |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 418 | } else { |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 419 | VDBG("adjusting timeout\n"); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 420 | timersub(&tv1, &tv2, &tv1); |
| 421 | timeout = 1000 * tv1.tv_sec |
| 422 | + tv1.tv_usec / 1000; |
| 423 | } |
| 424 | } |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 425 | |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 426 | if ((fds[0].revents & POLLIN) == 0) { |
| 427 | if (fds[0].revents & POLLERR) { |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 428 | // FIXME: links routinely go down; |
| 429 | // this shouldn't necessarily exit. |
Denis Vlasenko | 65113e8 | 2006-09-03 12:31:59 +0000 | [diff] [blame] | 430 | bb_error_msg("%s: poll error", intf); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 431 | if (ready) { |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 432 | run(script, "deconfig", |
| 433 | intf, &ip); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 434 | } |
| 435 | return EXIT_FAILURE; |
| 436 | } |
| 437 | continue; |
| 438 | } |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 439 | |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 440 | // read ARP packet |
Denis Vlasenko | 9ab2658 | 2007-02-14 20:50:22 +0000 | [diff] [blame] | 441 | if (recv(fd, &p, sizeof(p), 0) < 0) { |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 442 | why = "recv"; |
| 443 | goto bad; |
| 444 | } |
| 445 | if (p.hdr.ether_type != htons(ETHERTYPE_ARP)) |
| 446 | continue; |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 447 | |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 448 | #ifdef DEBUG |
| 449 | { |
| 450 | struct ether_addr * sha = (struct ether_addr *) p.arp.arp_sha; |
| 451 | struct ether_addr * tha = (struct ether_addr *) p.arp.arp_tha; |
| 452 | struct in_addr * spa = (struct in_addr *) p.arp.arp_spa; |
| 453 | struct in_addr * tpa = (struct in_addr *) p.arp.arp_tpa; |
| 454 | VDBG("%s recv arp type=%d, op=%d,\n", |
Rob Landley | e3752e5 | 2005-05-03 03:28:55 +0000 | [diff] [blame] | 455 | intf, ntohs(p.hdr.ether_type), |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 456 | ntohs(p.arp.arp_op)); |
| 457 | VDBG("\tsource=%s %s\n", |
| 458 | ether_ntoa(sha), |
| 459 | inet_ntoa(*spa)); |
| 460 | VDBG("\ttarget=%s %s\n", |
| 461 | ether_ntoa(tha), |
| 462 | inet_ntoa(*tpa)); |
| 463 | } |
| 464 | #endif |
| 465 | if (p.arp.arp_op != htons(ARPOP_REQUEST) |
| 466 | && p.arp.arp_op != htons(ARPOP_REPLY)) |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 467 | continue; |
| 468 | |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 469 | if (memcmp(p.arp.arp_spa, &ip.s_addr, sizeof(struct in_addr)) == 0 && |
Denis Vlasenko | 60e3dd6 | 2006-09-03 12:26:06 +0000 | [diff] [blame] | 470 | memcmp(ð_addr, &p.arp.arp_sha, ETH_ALEN) != 0) { |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 471 | source_ip_conflict = 1; |
| 472 | } |
| 473 | if (memcmp(p.arp.arp_tpa, &ip.s_addr, sizeof(struct in_addr)) == 0 && |
| 474 | p.arp.arp_op == htons(ARPOP_REQUEST) && |
Denis Vlasenko | 60e3dd6 | 2006-09-03 12:26:06 +0000 | [diff] [blame] | 475 | memcmp(ð_addr, &p.arp.arp_tha, ETH_ALEN) != 0) { |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 476 | target_ip_conflict = 1; |
| 477 | } |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 478 | |
Denis Vlasenko | 9213a9e | 2006-09-17 16:28:10 +0000 | [diff] [blame] | 479 | VDBG("state = %d, source ip conflict = %d, target ip conflict = %d\n", |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 480 | state, source_ip_conflict, target_ip_conflict); |
| 481 | switch (state) { |
| 482 | case PROBE: |
| 483 | case ANNOUNCE: |
| 484 | // When probing or announcing, check for source IP conflicts |
| 485 | // and other hosts doing ARP probes (target IP conflicts). |
| 486 | if (source_ip_conflict || target_ip_conflict) { |
| 487 | conflicts++; |
| 488 | if (conflicts >= MAX_CONFLICTS) { |
| 489 | VDBG("%s ratelimit\n", intf); |
| 490 | timeout = RATE_LIMIT_INTERVAL * 1000; |
| 491 | state = RATE_LIMIT_PROBE; |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 492 | } |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 493 | |
| 494 | // restart the whole protocol |
| 495 | pick(&ip); |
| 496 | timeout = 0; |
| 497 | nprobes = 0; |
| 498 | nclaims = 0; |
| 499 | } |
| 500 | break; |
| 501 | case MONITOR: |
| 502 | // If a conflict, we try to defend with a single ARP probe. |
| 503 | if (source_ip_conflict) { |
| 504 | VDBG("monitor conflict -- defending\n"); |
| 505 | state = DEFEND; |
| 506 | timeout = DEFEND_INTERVAL * 1000; |
Denis Vlasenko | af906a3 | 2006-09-03 12:29:53 +0000 | [diff] [blame] | 507 | arp(fd, &saddr, |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 508 | ARPOP_REQUEST, |
Denis Vlasenko | 60e3dd6 | 2006-09-03 12:26:06 +0000 | [diff] [blame] | 509 | ð_addr, ip, |
| 510 | ð_addr, ip); |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 511 | } |
| 512 | break; |
| 513 | case DEFEND: |
| 514 | // Well, we tried. Start over (on conflict). |
| 515 | if (source_ip_conflict) { |
| 516 | state = PROBE; |
| 517 | VDBG("defend conflict -- starting over\n"); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 518 | ready = 0; |
| 519 | run(script, "deconfig", intf, &ip); |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 520 | |
| 521 | // restart the whole protocol |
| 522 | pick(&ip); |
| 523 | timeout = 0; |
| 524 | nprobes = 0; |
| 525 | nclaims = 0; |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 526 | } |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 527 | break; |
| 528 | default: |
| 529 | // Invalid, should never happen. Restart the whole protocol. |
| 530 | VDBG("invalid state -- starting over\n"); |
| 531 | state = PROBE; |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 532 | pick(&ip); |
| 533 | timeout = 0; |
| 534 | nprobes = 0; |
| 535 | nclaims = 0; |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 536 | break; |
| 537 | } // switch state |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 538 | |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 539 | break; // case 1 (packets arriving) |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 540 | default: |
| 541 | why = "poll"; |
| 542 | goto bad; |
Denis Vlasenko | 87d80dc | 2006-09-03 12:20:36 +0000 | [diff] [blame] | 543 | } // switch poll |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 544 | } |
| 545 | bad: |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 546 | bb_perror_msg("%s, %s", intf, why); |
Rob Landley | ad8071f | 2005-04-30 03:49:37 +0000 | [diff] [blame] | 547 | return EXIT_FAILURE; |
| 548 | } |