1 /* $OpenBSD: control.c,v 1.13 2018/08/04 11:07:14 mestre 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 int 103 control_accept(int listenfd) 104 { 105 int connfd; 106 socklen_t len; 107 struct sockaddr_un sa; 108 struct ctl_conn *ctl_conn; 109 110 len = sizeof(sa); 111 if ((connfd = accept(listenfd, 112 (struct sockaddr *)&sa, &len)) == -1) { 113 if (errno != EWOULDBLOCK && errno != EINTR) 114 log_warn("control_accept: accept"); 115 return (0); 116 } 117 118 session_socket_nonblockmode(connfd); 119 120 if ((ctl_conn = calloc(1, sizeof(struct ctl_conn))) == NULL) { 121 log_warn("control_accept"); 122 close(connfd); 123 return (0); 124 } 125 126 imsg_init(&ctl_conn->ibuf, connfd); 127 128 TAILQ_INSERT_TAIL(&ctl_conns, ctl_conn, entry); 129 130 return (1); 131 } 132 133 struct ctl_conn * 134 control_connbyfd(int fd) 135 { 136 struct ctl_conn *c; 137 138 TAILQ_FOREACH(c, &ctl_conns, entry) { 139 if (c->ibuf.fd == fd) 140 break; 141 } 142 143 return (c); 144 } 145 146 int 147 control_close(int fd) 148 { 149 struct ctl_conn *c; 150 151 if ((c = control_connbyfd(fd)) == NULL) { 152 log_warn("control_close: fd %d: not found", fd); 153 return (0); 154 } 155 156 msgbuf_clear(&c->ibuf.w); 157 TAILQ_REMOVE(&ctl_conns, c, entry); 158 159 close(c->ibuf.fd); 160 free(c); 161 162 return (1); 163 } 164 165 int 166 control_dispatch_msg(struct pollfd *pfd, u_int *ctl_cnt) 167 { 168 struct imsg imsg; 169 struct ctl_conn *c; 170 struct ntp_peer *p; 171 struct ntp_sensor *s; 172 struct ctl_show_status c_status; 173 struct ctl_show_peer c_peer; 174 struct ctl_show_sensor c_sensor; 175 int cnt; 176 ssize_t n; 177 178 if ((c = control_connbyfd(pfd->fd)) == NULL) { 179 log_warn("control_dispatch_msg: fd %d: not found", pfd->fd); 180 return (0); 181 } 182 183 if (pfd->revents & POLLOUT) 184 if (msgbuf_write(&c->ibuf.w) <= 0 && errno != EAGAIN) { 185 *ctl_cnt -= control_close(pfd->fd); 186 return (1); 187 } 188 189 if (!(pfd->revents & POLLIN)) 190 return (0); 191 192 if (((n = imsg_read(&c->ibuf)) == -1 && errno != EAGAIN) || n == 0) { 193 *ctl_cnt -= control_close(pfd->fd); 194 return (1); 195 } 196 197 for (;;) { 198 if ((n = imsg_get(&c->ibuf, &imsg)) == -1) { 199 *ctl_cnt -= control_close(pfd->fd); 200 return (1); 201 } 202 if (n == 0) 203 break; 204 205 switch (imsg.hdr.type) { 206 case IMSG_CTL_SHOW_STATUS: 207 build_show_status(&c_status); 208 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_STATUS, 0, 0, -1, 209 &c_status, sizeof (c_status)); 210 break; 211 case IMSG_CTL_SHOW_PEERS: 212 cnt = 0; 213 TAILQ_FOREACH(p, &conf->ntp_peers, entry) { 214 build_show_peer(&c_peer, p); 215 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_PEERS, 216 0, 0, -1, &c_peer, sizeof(c_peer)); 217 cnt++; 218 } 219 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_PEERS_END, 220 0, 0, -1, &cnt, sizeof(cnt)); 221 break; 222 case IMSG_CTL_SHOW_SENSORS: 223 cnt = 0; 224 TAILQ_FOREACH(s, &conf->ntp_sensors, entry) { 225 build_show_sensor(&c_sensor, s); 226 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_SENSORS, 227 0, 0, -1, &c_sensor, sizeof(c_sensor)); 228 cnt++; 229 } 230 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_SENSORS_END, 231 0, 0, -1, &cnt, sizeof(cnt)); 232 break; 233 case IMSG_CTL_SHOW_ALL: 234 build_show_status(&c_status); 235 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_STATUS, 0, 0, -1, 236 &c_status, sizeof (c_status)); 237 238 cnt = 0; 239 TAILQ_FOREACH(p, &conf->ntp_peers, entry) { 240 build_show_peer(&c_peer, p); 241 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_PEERS, 242 0, 0, -1, &c_peer, sizeof(c_peer)); 243 cnt++; 244 } 245 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_PEERS_END, 246 0, 0, -1, &cnt, sizeof(cnt)); 247 248 cnt = 0; 249 TAILQ_FOREACH(s, &conf->ntp_sensors, entry) { 250 build_show_sensor(&c_sensor, s); 251 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_SENSORS, 252 0, 0, -1, &c_sensor, sizeof(c_sensor)); 253 cnt++; 254 } 255 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_SENSORS_END, 256 0, 0, -1, &cnt, sizeof(cnt)); 257 258 imsg_compose(&c->ibuf, IMSG_CTL_SHOW_ALL_END, 259 0, 0, -1, NULL, 0); 260 break; 261 default: 262 break; 263 } 264 imsg_free(&imsg); 265 } 266 return (0); 267 } 268 269 void 270 session_socket_nonblockmode(int fd) 271 { 272 int flags; 273 274 if ((flags = fcntl(fd, F_GETFL)) == -1) 275 fatal("fcntl F_GETFL"); 276 277 flags |= O_NONBLOCK; 278 279 if ((flags = fcntl(fd, F_SETFL, flags)) == -1) 280 fatal("fcntl F_SETFL"); 281 } 282 283 void 284 build_show_status(struct ctl_show_status *cs) 285 { 286 struct ntp_peer *p; 287 struct ntp_sensor *s; 288 289 cs->peercnt = cs->valid_peers = 0; 290 cs->sensorcnt = cs->valid_sensors = 0; 291 292 TAILQ_FOREACH(p, &conf->ntp_peers, entry) { 293 cs->peercnt++; 294 if (p->trustlevel >= TRUSTLEVEL_BADPEER) 295 cs->valid_peers++; 296 } 297 TAILQ_FOREACH(s, &conf->ntp_sensors, entry) { 298 cs->sensorcnt++; 299 if (s->update.good) 300 cs->valid_sensors++; 301 } 302 303 cs->synced = conf->status.synced; 304 cs->stratum = conf->status.stratum; 305 cs->clock_offset = getoffset() * 1000.0; 306 cs->constraint_median = conf->constraint_median; 307 cs->constraint_last = conf->constraint_last; 308 cs->constraint_errors = conf->constraint_errors; 309 } 310 311 void 312 build_show_peer(struct ctl_show_peer *cp, struct ntp_peer *p) 313 { 314 const char *a = "not resolved"; 315 const char *pool = "", *addr_head_name = ""; 316 u_int8_t shift, best, validdelaycnt, jittercnt; 317 time_t now; 318 319 now = getmonotime(); 320 321 if (p->addr) 322 a = log_sockaddr((struct sockaddr *)&p->addr->ss); 323 if (p->addr_head.pool) 324 pool = "from pool "; 325 326 if (0 != strcmp(a, p->addr_head.name)) 327 addr_head_name = p->addr_head.name; 328 329 snprintf(cp->peer_desc, sizeof(cp->peer_desc), 330 "%s %s%s", a, pool, addr_head_name); 331 332 validdelaycnt = best = 0; 333 cp->offset = cp->delay = 0.0; 334 for (shift = 0; shift < OFFSET_ARRAY_SIZE; shift++) { 335 if (p->reply[shift].delay > 0.0) { 336 cp->offset += p->reply[shift].offset; 337 cp->delay += p->reply[shift].delay; 338 339 if (p->reply[shift].delay < p->reply[best].delay) 340 best = shift; 341 342 validdelaycnt++; 343 } 344 } 345 346 if (validdelaycnt > 1) { 347 cp->offset /= validdelaycnt; 348 cp->delay /= validdelaycnt; 349 } 350 351 jittercnt = 0; 352 cp->jitter = 0.0; 353 for (shift = 0; shift < OFFSET_ARRAY_SIZE; shift++) { 354 if (p->reply[shift].delay > 0.0 && shift != best) { 355 cp->jitter += square(p->reply[shift].delay - 356 p->reply[best].delay); 357 jittercnt++; 358 } 359 } 360 if (jittercnt > 1) 361 cp->jitter /= jittercnt; 362 cp->jitter = sqrt(cp->jitter); 363 364 if (p->shift == 0) 365 shift = OFFSET_ARRAY_SIZE - 1; 366 else 367 shift = p->shift - 1; 368 369 if (conf->status.synced == 1 && 370 p->reply[shift].status.send_refid == conf->status.refid) 371 cp->syncedto = 1; 372 else 373 cp->syncedto = 0; 374 375 /* milliseconds to reduce number of leading zeroes */ 376 cp->offset *= 1000.0; 377 cp->delay *= 1000.0; 378 cp->jitter *= 1000.0; 379 380 cp->weight = p->weight; 381 cp->trustlevel = p->trustlevel; 382 cp->stratum = p->reply[shift].status.stratum; 383 cp->next = p->next - now < 0 ? 0 : p->next - now; 384 cp->poll = p->poll; 385 } 386 387 void 388 build_show_sensor(struct ctl_show_sensor *cs, struct ntp_sensor *s) 389 { 390 time_t now; 391 u_int8_t shift; 392 u_int32_t refid; 393 394 now = getmonotime(); 395 396 memcpy(&refid, SENSOR_DEFAULT_REFID, sizeof(refid)); 397 refid = refid == s->refid ? 0 : s->refid; 398 399 snprintf(cs->sensor_desc, sizeof(cs->sensor_desc), 400 "%s %.4s", s->device, (char *)&refid); 401 402 if (s->shift == 0) 403 shift = SENSOR_OFFSETS - 1; 404 else 405 shift = s->shift - 1; 406 407 if (conf->status.synced == 1 && 408 s->offsets[shift].status.send_refid == conf->status.refid) 409 cs->syncedto = 1; 410 else 411 cs->syncedto = 0; 412 413 cs->weight = s->weight; 414 cs->good = s->update.good; 415 cs->stratum = s->offsets[shift].status.stratum; 416 cs->next = s->next - now < 0 ? 0 : s->next - now; 417 cs->poll = SENSOR_QUERY_INTERVAL; 418 cs->offset = s->offsets[shift].offset * 1000.0; 419 cs->correction = (double)s->correction / 1000.0; 420 } 421