1 /* $OpenBSD: control.c,v 1.24 2015/12/05 13:12:41 claudio 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(char *path) 43 { 44 struct sockaddr_un sun; 45 int fd; 46 mode_t old_umask; 47 48 if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 49 0)) == -1) { 50 log_warn("control_init: socket"); 51 return (-1); 52 } 53 54 bzero(&sun, sizeof(sun)); 55 sun.sun_family = AF_UNIX; 56 strlcpy(sun.sun_path, path, sizeof(sun.sun_path)); 57 58 if (unlink(path) == -1) 59 if (errno != ENOENT) { 60 log_warn("control_init: unlink %s", path); 61 close(fd); 62 return (-1); 63 } 64 65 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH); 66 if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) { 67 log_warn("control_init: bind: %s", path); 68 close(fd); 69 umask(old_umask); 70 return (-1); 71 } 72 umask(old_umask); 73 74 if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) { 75 log_warn("control_init: chmod"); 76 close(fd); 77 (void)unlink(path); 78 return (-1); 79 } 80 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(char *path) 104 { 105 event_del(&control_state.ev); 106 event_del(&control_state.evt); 107 if (path) 108 unlink(path); 109 } 110 111 /* ARGSUSED */ 112 void 113 control_accept(int listenfd, short event, void *bula) 114 { 115 int connfd; 116 socklen_t len; 117 struct sockaddr_un sun; 118 struct ctl_conn *c; 119 120 event_add(&control_state.ev, NULL); 121 if ((event & EV_TIMEOUT)) 122 return; 123 124 len = sizeof(sun); 125 if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len, 126 SOCK_CLOEXEC | SOCK_NONBLOCK)) == -1) { 127 /* 128 * Pause accept if we are out of file descriptors, or 129 * libevent will haunt us here too. 130 */ 131 if (errno == ENFILE || errno == EMFILE) { 132 struct timeval evtpause = { 1, 0 }; 133 134 event_del(&control_state.ev); 135 evtimer_add(&control_state.evt, &evtpause); 136 } else if (errno != EWOULDBLOCK && errno != EINTR && 137 errno != ECONNABORTED) 138 log_warn("control_accept: accept"); 139 return; 140 } 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 && errno != EAGAIN) || 224 n == 0) { 225 control_close(fd); 226 return; 227 } 228 } 229 if (event & EV_WRITE) { 230 if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) { 231 control_close(fd); 232 return; 233 } 234 } 235 236 for (;;) { 237 if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) { 238 control_close(fd); 239 return; 240 } 241 242 if (n == 0) 243 break; 244 245 switch (imsg.hdr.type) { 246 case IMSG_CTL_FIB_COUPLE: 247 case IMSG_CTL_FIB_DECOUPLE: 248 ospfe_fib_update(imsg.hdr.type); 249 /* FALLTHROUGH */ 250 case IMSG_CTL_RELOAD: 251 c->iev.ibuf.pid = imsg.hdr.pid; 252 ospfe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0); 253 break; 254 case IMSG_CTL_KROUTE: 255 case IMSG_CTL_KROUTE_ADDR: 256 c->iev.ibuf.pid = imsg.hdr.pid; 257 ospfe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid, 258 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 259 break; 260 case IMSG_CTL_SHOW_INTERFACE: 261 if (imsg.hdr.len == IMSG_HEADER_SIZE + 262 sizeof(ifidx)) { 263 memcpy(&ifidx, imsg.data, sizeof(ifidx)); 264 ospfe_iface_ctl(c, ifidx); 265 imsg_compose(&c->iev.ibuf, IMSG_CTL_END, 0, 266 0, -1, NULL, 0); 267 } 268 break; 269 case IMSG_CTL_SHOW_DATABASE: 270 case IMSG_CTL_SHOW_DB_EXT: 271 case IMSG_CTL_SHOW_DB_LINK: 272 case IMSG_CTL_SHOW_DB_NET: 273 case IMSG_CTL_SHOW_DB_RTR: 274 case IMSG_CTL_SHOW_DB_INTRA: 275 case IMSG_CTL_SHOW_DB_SELF: 276 case IMSG_CTL_SHOW_DB_SUM: 277 case IMSG_CTL_SHOW_DB_ASBR: 278 case IMSG_CTL_SHOW_RIB: 279 case IMSG_CTL_SHOW_SUM: 280 c->iev.ibuf.pid = imsg.hdr.pid; 281 ospfe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid, 282 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 283 break; 284 case IMSG_CTL_SHOW_NBR: 285 ospfe_nbr_ctl(c); 286 break; 287 case IMSG_CTL_LOG_VERBOSE: 288 if (imsg.hdr.len != IMSG_HEADER_SIZE + 289 sizeof(verbose)) 290 break; 291 292 /* forward to other processes */ 293 ospfe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid, 294 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 295 ospfe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid, 296 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 297 298 memcpy(&verbose, imsg.data, sizeof(verbose)); 299 log_verbose(verbose); 300 break; 301 default: 302 log_debug("control_dispatch_imsg: " 303 "error handling imsg %d", imsg.hdr.type); 304 break; 305 } 306 imsg_free(&imsg); 307 } 308 309 imsg_event_add(&c->iev); 310 } 311 312 int 313 control_imsg_relay(struct imsg *imsg) 314 { 315 struct ctl_conn *c; 316 317 if ((c = control_connbypid(imsg->hdr.pid)) == NULL) 318 return (0); 319 320 return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid, 321 -1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE)); 322 } 323