1 /* $OpenBSD: control.c,v 1.12 2017/01/09 14:04:31 krw Exp $ */ 2 3 /* 4 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> 5 * Copyright (c) 2012 Mike Miller <mmiller@mgm51.com> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/types.h> 21 #include <sys/stat.h> 22 #include <sys/socket.h> 23 #include <sys/un.h> 24 #include <errno.h> 25 #include <math.h> 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <string.h> 29 #include <unistd.h> 30 #include <fcntl.h> 31 #include <err.h> 32 33 #include "ntpd.h" 34 35 #define CONTROL_BACKLOG 5 36 37 #define square(x) ((x) * (x)) 38 39 int 40 control_init(char *path) 41 { 42 struct sockaddr_un sa; 43 int fd; 44 mode_t old_umask; 45 46 if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) == -1) { 47 log_warn("control_init: socket"); 48 return (-1); 49 } 50 51 memset(&sa, 0, sizeof(sa)); 52 sa.sun_family = AF_UNIX; 53 if (strlcpy(sa.sun_path, path, sizeof(sa.sun_path)) >= 54 sizeof(sa.sun_path)) 55 errx(1, "ctl socket name too long"); 56 57 if (unlink(path) == -1) 58 if (errno != ENOENT) { 59 log_warn("control_init: unlink %s", path); 60 close(fd); 61 return (-1); 62 } 63 64 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH); 65 if (bind(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) { 66 log_warn("control_init: bind: %s", path); 67 close(fd); 68 umask(old_umask); 69 return (-1); 70 } 71 umask(old_umask); 72 73 if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) { 74 log_warn("control_init: chmod"); 75 close(fd); 76 (void)unlink(path); 77 return (-1); 78 } 79 80 session_socket_nonblockmode(fd); 81 82 return (fd); 83 } 84 85 int 86 control_listen(int fd) 87 { 88 if (fd != -1 && listen(fd, CONTROL_BACKLOG) == -1) { 89 log_warn("control_listen: listen"); 90 return (-1); 91 } 92 93 return (0); 94 } 95 96 void 97 control_shutdown(int fd) 98 { 99 close(fd); 100 } 101 102 void 103 control_cleanup(const char *path) 104 { 105 if (path) 106 unlink(path); 107 } 108 109 int 110 control_accept(int listenfd) 111 { 112 int connfd; 113 socklen_t len; 114 struct sockaddr_un sa; 115 struct ctl_conn *ctl_conn; 116 117 len = sizeof(sa); 118 if ((connfd = accept(listenfd, 119 (struct sockaddr *)&sa, &len)) == -1) { 120 if (errno != EWOULDBLOCK && errno != EINTR) 121 log_warn("control_accept: accept"); 122 return (0); 123 } 124 125 session_socket_nonblockmode(connfd); 126 127 if ((ctl_conn = calloc(1, sizeof(struct ctl_conn))) == NULL) { 128 log_warn("control_accept"); 129 close(connfd); 130 return (0); 131 } 132 133 imsg_init(&ctl_conn->ibuf, connfd); 134 135 TAILQ_INSERT_TAIL(&ctl_conns, ctl_conn, entry); 136 137 return (1); 138 } 139 140 struct ctl_conn * 141 control_connbyfd(int fd) 142 { 143 struct ctl_conn *c; 144 145 TAILQ_FOREACH(c, &ctl_conns, entry) { 146 if (c->ibuf.fd == fd) 147 break; 148 } 149 150 return (c); 151 } 152 153 int 154 control_close(int fd) 155 { 156 struct ctl_conn *c; 157 158 if ((c = control_connbyfd(fd)) == NULL) { 159 log_warn("control_close: fd %d: not found", fd); 160 return (0); 161 } 162 163 msgbuf_clear(&c->ibuf.w); 164 TAILQ_REMOVE(&ctl_conns, c, entry); 165 166 close(c->ibuf.fd); 167 free(c); 168 169 return (1); 170 } 171 172 int 173 control_dispatch_msg(struct pollfd *pfd, u_int *ctl_cnt) 174 { 175 struct imsg imsg; 176 struct ctl_conn *c; 177 struct ntp_peer *p; 178 struct ntp_sensor *s; 179 struct ctl_show_status c_status; 180 struct ctl_show_peer c_peer; 181 struct ctl_show_sensor c_sensor; 182 int cnt; 183 ssize_t n; 184 185 if ((c = control_connbyfd(pfd->fd)) == NULL) { 186 log_warn("control_dispatch_msg: fd %d: not found", pfd->fd); 187 return (0); 188 } 189 190 if (pfd->revents & POLLOUT) 191 if (msgbuf_write(&c->ibuf.w) <= 0 && errno != EAGAIN) { 192 *ctl_cnt -= control_close(pfd->fd); 193 return (1); 194 } 195 196 if (!(pfd->revents & POLLIN)) 197 return (0); 198 199 if (((n = imsg_read(&c->ibuf)) == -1 && errno != EAGAIN) || n == 0) { 200 *ctl_cnt -= control_close(pfd->fd); 201 return (1); 202 } 203 204 for (;;) { 205 if ((n = imsg_get(&c->ibuf, &imsg)) == -1) { 206 *ctl_cnt -= control_close(pfd->fd); 207 return (1); 208 } 209 if (n == 0) 210 break; 211 212 switch (imsg.hdr.type) { 213 case IMSG_CTL_SHOW_STATUS: 214 build_show_status(&c_status); 215 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_STATUS, 0, 0, -1, 216 &c_status, sizeof (c_status)); 217 break; 218 case IMSG_CTL_SHOW_PEERS: 219 cnt = 0; 220 TAILQ_FOREACH(p, &conf->ntp_peers, entry) { 221 build_show_peer(&c_peer, p); 222 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_PEERS, 223 0, 0, -1, &c_peer, sizeof(c_peer)); 224 cnt++; 225 } 226 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_PEERS_END, 227 0, 0, -1, &cnt, sizeof(cnt)); 228 break; 229 case IMSG_CTL_SHOW_SENSORS: 230 cnt = 0; 231 TAILQ_FOREACH(s, &conf->ntp_sensors, entry) { 232 build_show_sensor(&c_sensor, s); 233 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_SENSORS, 234 0, 0, -1, &c_sensor, sizeof(c_sensor)); 235 cnt++; 236 } 237 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_SENSORS_END, 238 0, 0, -1, &cnt, sizeof(cnt)); 239 break; 240 case IMSG_CTL_SHOW_ALL: 241 build_show_status(&c_status); 242 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_STATUS, 0, 0, -1, 243 &c_status, sizeof (c_status)); 244 245 cnt = 0; 246 TAILQ_FOREACH(p, &conf->ntp_peers, entry) { 247 build_show_peer(&c_peer, p); 248 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_PEERS, 249 0, 0, -1, &c_peer, sizeof(c_peer)); 250 cnt++; 251 } 252 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_PEERS_END, 253 0, 0, -1, &cnt, sizeof(cnt)); 254 255 cnt = 0; 256 TAILQ_FOREACH(s, &conf->ntp_sensors, entry) { 257 build_show_sensor(&c_sensor, s); 258 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_SENSORS, 259 0, 0, -1, &c_sensor, sizeof(c_sensor)); 260 cnt++; 261 } 262 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_SENSORS_END, 263 0, 0, -1, &cnt, sizeof(cnt)); 264 265 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_ALL_END, 266 0, 0, -1, NULL, 0); 267 break; 268 default: 269 break; 270 } 271 imsg_free(&imsg); 272 } 273 return (0); 274 } 275 276 void 277 session_socket_nonblockmode(int fd) 278 { 279 int flags; 280 281 if ((flags = fcntl(fd, F_GETFL)) == -1) 282 fatal("fcntl F_GETFL"); 283 284 flags |= O_NONBLOCK; 285 286 if ((flags = fcntl(fd, F_SETFL, flags)) == -1) 287 fatal("fcntl F_SETFL"); 288 } 289 290 void 291 build_show_status(struct ctl_show_status *cs) 292 { 293 struct ntp_peer *p; 294 struct ntp_sensor *s; 295 296 cs->peercnt = cs->valid_peers = 0; 297 cs->sensorcnt = cs->valid_sensors = 0; 298 299 TAILQ_FOREACH(p, &conf->ntp_peers, entry) { 300 cs->peercnt++; 301 if (p->trustlevel >= TRUSTLEVEL_BADPEER) 302 cs->valid_peers++; 303 } 304 TAILQ_FOREACH(s, &conf->ntp_sensors, entry) { 305 cs->sensorcnt++; 306 if (s->update.good) 307 cs->valid_sensors++; 308 } 309 310 cs->synced = conf->status.synced; 311 cs->stratum = conf->status.stratum; 312 cs->clock_offset = getoffset() * 1000.0; 313 cs->constraint_median = conf->constraint_median; 314 cs->constraint_last = conf->constraint_last; 315 cs->constraint_errors = conf->constraint_errors; 316 } 317 318 void 319 build_show_peer(struct ctl_show_peer *cp, struct ntp_peer *p) 320 { 321 const char *a = "not resolved"; 322 const char *pool = "", *addr_head_name = ""; 323 u_int8_t shift, best, validdelaycnt, jittercnt; 324 time_t now; 325 326 now = getmonotime(); 327 328 if (p->addr) 329 a = log_sockaddr((struct sockaddr *)&p->addr->ss); 330 if (p->addr_head.pool) 331 pool = "from pool "; 332 333 if (0 != strcmp(a, p->addr_head.name)) 334 addr_head_name = p->addr_head.name; 335 336 snprintf(cp->peer_desc, sizeof(cp->peer_desc), 337 "%s %s%s", a, pool, addr_head_name); 338 339 validdelaycnt = best = 0; 340 cp->offset = cp->delay = 0.0; 341 for (shift = 0; shift < OFFSET_ARRAY_SIZE; shift++) { 342 if (p->reply[shift].delay > 0.0) { 343 cp->offset += p->reply[shift].offset; 344 cp->delay += p->reply[shift].delay; 345 346 if (p->reply[shift].delay < p->reply[best].delay) 347 best = shift; 348 349 validdelaycnt++; 350 } 351 } 352 353 if (validdelaycnt > 1) { 354 cp->offset /= validdelaycnt; 355 cp->delay /= validdelaycnt; 356 } 357 358 jittercnt = 0; 359 cp->jitter = 0.0; 360 for (shift = 0; shift < OFFSET_ARRAY_SIZE; shift++) { 361 if (p->reply[shift].delay > 0.0 && shift != best) { 362 cp->jitter += square(p->reply[shift].delay - 363 p->reply[best].delay); 364 jittercnt++; 365 } 366 } 367 if (jittercnt > 1) 368 cp->jitter /= jittercnt; 369 cp->jitter = sqrt(cp->jitter); 370 371 if (p->shift == 0) 372 shift = OFFSET_ARRAY_SIZE - 1; 373 else 374 shift = p->shift - 1; 375 376 if (conf->status.synced == 1 && 377 p->reply[shift].status.send_refid == conf->status.refid) 378 cp->syncedto = 1; 379 else 380 cp->syncedto = 0; 381 382 /* milliseconds to reduce number of leading zeroes */ 383 cp->offset *= 1000.0; 384 cp->delay *= 1000.0; 385 cp->jitter *= 1000.0; 386 387 cp->weight = p->weight; 388 cp->trustlevel = p->trustlevel; 389 cp->stratum = p->reply[shift].status.stratum; 390 cp->next = p->next - now < 0 ? 0 : p->next - now; 391 cp->poll = p->poll; 392 } 393 394 void 395 build_show_sensor(struct ctl_show_sensor *cs, struct ntp_sensor *s) 396 { 397 time_t now; 398 u_int8_t shift; 399 u_int32_t refid; 400 401 now = getmonotime(); 402 403 memcpy(&refid, SENSOR_DEFAULT_REFID, sizeof(refid)); 404 refid = refid == s->refid ? 0 : s->refid; 405 406 snprintf(cs->sensor_desc, sizeof(cs->sensor_desc), 407 "%s %.4s", s->device, (char *)&refid); 408 409 if (s->shift == 0) 410 shift = SENSOR_OFFSETS - 1; 411 else 412 shift = s->shift - 1; 413 414 if (conf->status.synced == 1 && 415 s->offsets[shift].status.send_refid == conf->status.refid) 416 cs->syncedto = 1; 417 else 418 cs->syncedto = 0; 419 420 cs->weight = s->weight; 421 cs->good = s->update.good; 422 cs->stratum = s->offsets[shift].status.stratum; 423 cs->next = s->next - now < 0 ? 0 : s->next - now; 424 cs->poll = SENSOR_QUERY_INTERVAL; 425 cs->offset = s->offsets[shift].offset * 1000.0; 426 cs->correction = (double)s->correction / 1000.0; 427 } 428