1 /* $OpenBSD: control.c,v 1.18 2012/04/11 08:33:53 deraadt 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 "ospf6d.h" 30 #include "ospf6.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_init(void) 43 { 44 struct sockaddr_un sun; 45 int fd; 46 mode_t old_umask; 47 48 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) { 49 log_warn("control_init: socket"); 50 return (-1); 51 } 52 53 bzero(&sun, sizeof(sun)); 54 sun.sun_family = AF_UNIX; 55 strlcpy(sun.sun_path, OSPF6D_SOCKET, sizeof(sun.sun_path)); 56 57 if (unlink(OSPF6D_SOCKET) == -1) 58 if (errno != ENOENT) { 59 log_warn("control_init: unlink %s", OSPF6D_SOCKET); 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 *)&sun, sizeof(sun)) == -1) { 66 log_warn("control_init: bind: %s", OSPF6D_SOCKET); 67 close(fd); 68 umask(old_umask); 69 return (-1); 70 } 71 umask(old_umask); 72 73 if (chmod(OSPF6D_SOCKET, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) { 74 log_warn("control_init: chmod"); 75 close(fd); 76 (void)unlink(OSPF6D_SOCKET); 77 return (-1); 78 } 79 80 session_socket_blockmode(fd, BM_NONBLOCK); 81 control_state.fd = fd; 82 83 return (0); 84 } 85 86 int 87 control_listen(void) 88 { 89 if (listen(control_state.fd, CONTROL_BACKLOG) == -1) { 90 log_warn("control_listen: listen"); 91 return (-1); 92 } 93 94 event_set(&control_state.ev, control_state.fd, EV_READ, 95 control_accept, NULL); 96 event_add(&control_state.ev, NULL); 97 evtimer_set(&control_state.evt, control_accept, NULL); 98 99 return (0); 100 } 101 102 void 103 control_cleanup(void) 104 { 105 event_del(&control_state.ev); 106 event_del(&control_state.evt); 107 unlink(OSPF6D_SOCKET); 108 } 109 110 /* ARGSUSED */ 111 void 112 control_accept(int listenfd, short event, void *bula) 113 { 114 int connfd; 115 socklen_t len; 116 struct sockaddr_un sun; 117 struct ctl_conn *c; 118 119 event_add(&control_state.ev, NULL); 120 if ((event & EV_TIMEOUT)) 121 return; 122 123 len = sizeof(sun); 124 if ((connfd = accept(listenfd, 125 (struct sockaddr *)&sun, &len)) == -1) { 126 /* 127 * Pause accept if we are out of file descriptors, or 128 * libevent will haunt us here too. 129 */ 130 if (errno == ENFILE || errno == EMFILE) { 131 struct timeval evtpause = { 1, 0 }; 132 133 event_del(&control_state.ev); 134 evtimer_add(&control_state.evt, &evtpause); 135 } else if (errno != EWOULDBLOCK && errno != EINTR) 136 log_warn("control_accept: accept"); 137 return; 138 } 139 140 session_socket_blockmode(connfd, BM_NONBLOCK); 141 142 if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) { 143 log_warn("control_accept"); 144 close(connfd); 145 return; 146 } 147 148 imsg_init(&c->iev.ibuf, connfd); 149 c->iev.handler = control_dispatch_imsg; 150 c->iev.events = EV_READ; 151 event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events, 152 c->iev.handler, &c->iev); 153 event_add(&c->iev.ev, NULL); 154 155 TAILQ_INSERT_TAIL(&ctl_conns, c, entry); 156 } 157 158 struct ctl_conn * 159 control_connbyfd(int fd) 160 { 161 struct ctl_conn *c; 162 163 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.fd != fd; 164 c = TAILQ_NEXT(c, entry)) 165 ; /* nothing */ 166 167 return (c); 168 } 169 170 struct ctl_conn * 171 control_connbypid(pid_t pid) 172 { 173 struct ctl_conn *c; 174 175 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.pid != pid; 176 c = TAILQ_NEXT(c, entry)) 177 ; /* nothing */ 178 179 return (c); 180 } 181 182 void 183 control_close(int fd) 184 { 185 struct ctl_conn *c; 186 187 if ((c = control_connbyfd(fd)) == NULL) { 188 log_warn("control_close: fd %d: not found", fd); 189 return; 190 } 191 192 msgbuf_clear(&c->iev.ibuf.w); 193 TAILQ_REMOVE(&ctl_conns, c, entry); 194 195 event_del(&c->iev.ev); 196 close(c->iev.ibuf.fd); 197 198 /* Some file descriptors are available again. */ 199 if (evtimer_pending(&control_state.evt, NULL)) { 200 evtimer_del(&control_state.evt); 201 event_add(&control_state.ev, NULL); 202 } 203 204 free(c); 205 } 206 207 /* ARGSUSED */ 208 void 209 control_dispatch_imsg(int fd, short event, void *bula) 210 { 211 struct ctl_conn *c; 212 struct imsg imsg; 213 int n; 214 unsigned int ifidx; 215 int verbose; 216 217 if ((c = control_connbyfd(fd)) == NULL) { 218 log_warn("control_dispatch_imsg: fd %d: not found", fd); 219 return; 220 } 221 222 if (event & EV_READ) { 223 if ((n = imsg_read(&c->iev.ibuf)) == -1 || n == 0) { 224 control_close(fd); 225 return; 226 } 227 } 228 if (event & EV_WRITE) { 229 if (msgbuf_write(&c->iev.ibuf.w) == -1) { 230 control_close(fd); 231 return; 232 } 233 } 234 235 for (;;) { 236 if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) { 237 control_close(fd); 238 return; 239 } 240 241 if (n == 0) 242 break; 243 244 switch (imsg.hdr.type) { 245 case IMSG_CTL_FIB_COUPLE: 246 case IMSG_CTL_FIB_DECOUPLE: 247 ospfe_fib_update(imsg.hdr.type); 248 /* FALLTHROUGH */ 249 case IMSG_CTL_RELOAD: 250 c->iev.ibuf.pid = imsg.hdr.pid; 251 ospfe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0); 252 break; 253 case IMSG_CTL_KROUTE: 254 case IMSG_CTL_KROUTE_ADDR: 255 c->iev.ibuf.pid = imsg.hdr.pid; 256 ospfe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid, 257 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 258 break; 259 case IMSG_CTL_SHOW_INTERFACE: 260 if (imsg.hdr.len == IMSG_HEADER_SIZE + 261 sizeof(ifidx)) { 262 memcpy(&ifidx, imsg.data, sizeof(ifidx)); 263 ospfe_iface_ctl(c, ifidx); 264 imsg_compose(&c->iev.ibuf, IMSG_CTL_END, 0, 265 0, -1, NULL, 0); 266 } 267 break; 268 case IMSG_CTL_SHOW_DATABASE: 269 case IMSG_CTL_SHOW_DB_EXT: 270 case IMSG_CTL_SHOW_DB_LINK: 271 case IMSG_CTL_SHOW_DB_NET: 272 case IMSG_CTL_SHOW_DB_RTR: 273 case IMSG_CTL_SHOW_DB_INTRA: 274 case IMSG_CTL_SHOW_DB_SELF: 275 case IMSG_CTL_SHOW_DB_SUM: 276 case IMSG_CTL_SHOW_DB_ASBR: 277 case IMSG_CTL_SHOW_RIB: 278 case IMSG_CTL_SHOW_SUM: 279 c->iev.ibuf.pid = imsg.hdr.pid; 280 ospfe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid, 281 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 282 break; 283 case IMSG_CTL_SHOW_NBR: 284 ospfe_nbr_ctl(c); 285 break; 286 case IMSG_CTL_LOG_VERBOSE: 287 if (imsg.hdr.len != IMSG_HEADER_SIZE + 288 sizeof(verbose)) 289 break; 290 291 /* forward to other processes */ 292 ospfe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid, 293 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 294 ospfe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid, 295 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 296 297 memcpy(&verbose, imsg.data, sizeof(verbose)); 298 log_verbose(verbose); 299 break; 300 default: 301 log_debug("control_dispatch_imsg: " 302 "error handling imsg %d", imsg.hdr.type); 303 break; 304 } 305 imsg_free(&imsg); 306 } 307 308 imsg_event_add(&c->iev); 309 } 310 311 int 312 control_imsg_relay(struct imsg *imsg) 313 { 314 struct ctl_conn *c; 315 316 if ((c = control_connbypid(imsg->hdr.pid)) == NULL) 317 return (0); 318 319 return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid, 320 -1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE)); 321 } 322 323 void 324 session_socket_blockmode(int fd, enum blockmodes bm) 325 { 326 int flags; 327 328 if ((flags = fcntl(fd, F_GETFL, 0)) == -1) 329 fatal("fcntl F_GETFL"); 330 331 if (bm == BM_NONBLOCK) 332 flags |= O_NONBLOCK; 333 else 334 flags &= ~O_NONBLOCK; 335 336 if ((flags = fcntl(fd, F_SETFL, flags)) == -1) 337 fatal("fcntl F_SETFL"); 338 } 339