1 /* $OpenBSD: control.c,v 1.45 2018/08/29 08:43:16 remi Exp $ */ 2 3 /* 4 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 #include <sys/stat.h> 21 #include <sys/socket.h> 22 #include <sys/un.h> 23 #include <errno.h> 24 #include <fcntl.h> 25 #include <stdlib.h> 26 #include <string.h> 27 #include <unistd.h> 28 29 #include "ospfd.h" 30 #include "ospf.h" 31 #include "ospfe.h" 32 #include "log.h" 33 #include "control.h" 34 35 #define CONTROL_BACKLOG 5 36 37 struct ctl_conn *control_connbyfd(int); 38 struct ctl_conn *control_connbypid(pid_t); 39 void control_close(int); 40 41 int 42 control_check(char *path) 43 { 44 struct sockaddr_un sun; 45 int fd; 46 47 bzero(&sun, sizeof(sun)); 48 sun.sun_family = AF_UNIX; 49 strlcpy(sun.sun_path, path, sizeof(sun.sun_path)); 50 51 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) { 52 log_warn("control_check: socket check"); 53 return (-1); 54 } 55 56 if (connect(fd, (struct sockaddr *)&sun, sizeof(sun)) == 0) { 57 log_warnx("control_check: socket in use"); 58 close(fd); 59 return (-1); 60 } 61 62 close(fd); 63 64 return (0); 65 } 66 67 int 68 control_init(char *path) 69 { 70 struct sockaddr_un sun; 71 int fd; 72 mode_t old_umask; 73 74 if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 75 0)) == -1) { 76 log_warn("control_init: socket"); 77 return (-1); 78 } 79 80 bzero(&sun, sizeof(sun)); 81 sun.sun_family = AF_UNIX; 82 strlcpy(sun.sun_path, path, sizeof(sun.sun_path)); 83 84 if (unlink(path) == -1) 85 if (errno != ENOENT) { 86 log_warn("control_init: unlink %s", path); 87 close(fd); 88 return (-1); 89 } 90 91 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH); 92 if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) { 93 log_warn("control_init: bind: %s", path); 94 close(fd); 95 umask(old_umask); 96 return (-1); 97 } 98 umask(old_umask); 99 100 if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) { 101 log_warn("control_init: chmod"); 102 close(fd); 103 (void)unlink(path); 104 return (-1); 105 } 106 107 return (fd); 108 } 109 110 int 111 control_listen(void) 112 { 113 114 if (listen(control_state.fd, CONTROL_BACKLOG) == -1) { 115 log_warn("control_listen: listen"); 116 return (-1); 117 } 118 119 event_set(&control_state.ev, control_state.fd, EV_READ, 120 control_accept, NULL); 121 event_add(&control_state.ev, NULL); 122 evtimer_set(&control_state.evt, control_accept, NULL); 123 124 return (0); 125 } 126 127 void 128 control_cleanup(char *path) 129 { 130 if (path == NULL) 131 return; 132 event_del(&control_state.ev); 133 event_del(&control_state.evt); 134 unlink(path); 135 } 136 137 /* ARGSUSED */ 138 void 139 control_accept(int listenfd, short event, void *bula) 140 { 141 int connfd; 142 socklen_t len; 143 struct sockaddr_un sun; 144 struct ctl_conn *c; 145 146 event_add(&control_state.ev, NULL); 147 if ((event & EV_TIMEOUT)) 148 return; 149 150 len = sizeof(sun); 151 if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len, 152 SOCK_CLOEXEC | SOCK_NONBLOCK)) == -1) { 153 /* 154 * Pause accept if we are out of file descriptors, or 155 * libevent will haunt us here too. 156 */ 157 if (errno == ENFILE || errno == EMFILE) { 158 struct timeval evtpause = { 1, 0 }; 159 160 event_del(&control_state.ev); 161 evtimer_add(&control_state.evt, &evtpause); 162 } else if (errno != EWOULDBLOCK && errno != EINTR && 163 errno != ECONNABORTED) 164 log_warn("control_accept: accept"); 165 return; 166 } 167 168 if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) { 169 log_warn("control_accept"); 170 close(connfd); 171 return; 172 } 173 174 imsg_init(&c->iev.ibuf, connfd); 175 c->iev.handler = control_dispatch_imsg; 176 c->iev.events = EV_READ; 177 event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events, 178 c->iev.handler, &c->iev); 179 event_add(&c->iev.ev, NULL); 180 181 TAILQ_INSERT_TAIL(&ctl_conns, c, entry); 182 } 183 184 struct ctl_conn * 185 control_connbyfd(int fd) 186 { 187 struct ctl_conn *c; 188 189 TAILQ_FOREACH(c, &ctl_conns, entry) { 190 if (c->iev.ibuf.fd == fd) 191 break; 192 } 193 194 return (c); 195 } 196 197 struct ctl_conn * 198 control_connbypid(pid_t pid) 199 { 200 struct ctl_conn *c; 201 202 TAILQ_FOREACH(c, &ctl_conns, entry) { 203 if (c->iev.ibuf.pid == pid) 204 break; 205 } 206 207 return (c); 208 } 209 210 void 211 control_close(int fd) 212 { 213 struct ctl_conn *c; 214 215 if ((c = control_connbyfd(fd)) == NULL) { 216 log_warn("control_close: fd %d: not found", fd); 217 return; 218 } 219 220 msgbuf_clear(&c->iev.ibuf.w); 221 TAILQ_REMOVE(&ctl_conns, c, entry); 222 223 event_del(&c->iev.ev); 224 close(c->iev.ibuf.fd); 225 226 /* Some file descriptors are available again. */ 227 if (evtimer_pending(&control_state.evt, NULL)) { 228 evtimer_del(&control_state.evt); 229 event_add(&control_state.ev, NULL); 230 } 231 232 free(c); 233 } 234 235 /* ARGSUSED */ 236 void 237 control_dispatch_imsg(int fd, short event, void *bula) 238 { 239 struct ctl_conn *c; 240 struct imsg imsg; 241 ssize_t n; 242 unsigned int ifidx; 243 int verbose; 244 245 if ((c = control_connbyfd(fd)) == NULL) { 246 log_warn("control_dispatch_imsg: fd %d: not found", fd); 247 return; 248 } 249 250 if (event & EV_READ) { 251 if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) || 252 n == 0) { 253 control_close(fd); 254 return; 255 } 256 } 257 if (event & EV_WRITE) { 258 if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) { 259 control_close(fd); 260 return; 261 } 262 } 263 264 for (;;) { 265 if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) { 266 control_close(fd); 267 return; 268 } 269 270 if (n == 0) 271 break; 272 273 switch (imsg.hdr.type) { 274 case IMSG_CTL_FIB_COUPLE: 275 case IMSG_CTL_FIB_DECOUPLE: 276 ospfe_fib_update(imsg.hdr.type); 277 /* FALLTHROUGH */ 278 case IMSG_CTL_FIB_RELOAD: 279 case IMSG_CTL_RELOAD: 280 c->iev.ibuf.pid = imsg.hdr.pid; 281 ospfe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0); 282 break; 283 case IMSG_CTL_KROUTE: 284 case IMSG_CTL_KROUTE_ADDR: 285 case IMSG_CTL_IFINFO: 286 c->iev.ibuf.pid = imsg.hdr.pid; 287 ospfe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid, 288 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 289 break; 290 case IMSG_CTL_SHOW_INTERFACE: 291 if (imsg.hdr.len == IMSG_HEADER_SIZE + 292 sizeof(ifidx)) { 293 memcpy(&ifidx, imsg.data, sizeof(ifidx)); 294 ospfe_iface_ctl(c, ifidx); 295 imsg_compose_event(&c->iev, IMSG_CTL_END, 0, 296 0, -1, NULL, 0); 297 } 298 break; 299 case IMSG_CTL_SHOW_DATABASE: 300 case IMSG_CTL_SHOW_DB_EXT: 301 case IMSG_CTL_SHOW_DB_NET: 302 case IMSG_CTL_SHOW_DB_RTR: 303 case IMSG_CTL_SHOW_DB_SELF: 304 case IMSG_CTL_SHOW_DB_SUM: 305 case IMSG_CTL_SHOW_DB_ASBR: 306 case IMSG_CTL_SHOW_DB_OPAQ: 307 case IMSG_CTL_SHOW_RIB: 308 case IMSG_CTL_SHOW_SUM: 309 c->iev.ibuf.pid = imsg.hdr.pid; 310 ospfe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid, 311 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 312 break; 313 case IMSG_CTL_SHOW_NBR: 314 ospfe_nbr_ctl(c); 315 break; 316 case IMSG_CTL_LOG_VERBOSE: 317 if (imsg.hdr.len != IMSG_HEADER_SIZE + 318 sizeof(verbose)) 319 break; 320 321 /* forward to other processes */ 322 ospfe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid, 323 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 324 ospfe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid, 325 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 326 327 memcpy(&verbose, imsg.data, sizeof(verbose)); 328 log_setverbose(verbose); 329 break; 330 default: 331 log_debug("control_dispatch_imsg: " 332 "error handling imsg %d", imsg.hdr.type); 333 break; 334 } 335 imsg_free(&imsg); 336 } 337 338 imsg_event_add(&c->iev); 339 } 340 341 int 342 control_imsg_relay(struct imsg *imsg) 343 { 344 struct ctl_conn *c; 345 346 if ((c = control_connbypid(imsg->hdr.pid)) == NULL) 347 return (0); 348 349 return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid, 350 -1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE)); 351 } 352