1 /* $OpenBSD: control.c,v 1.20 2008/01/31 12:17:35 henning 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 int control_imsg_relay(struct imsg *imsg); 38 39 struct ctl_conn *control_connbyfd(int); 40 struct ctl_conn *control_connbypid(pid_t); 41 void control_close(int); 42 43 int 44 control_init(void) 45 { 46 struct sockaddr_un sun; 47 int fd; 48 mode_t old_umask; 49 50 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) { 51 log_warn("control_init: socket"); 52 return (-1); 53 } 54 55 bzero(&sun, sizeof(sun)); 56 sun.sun_family = AF_UNIX; 57 strlcpy(sun.sun_path, OSPFD_SOCKET, sizeof(sun.sun_path)); 58 59 if (unlink(OSPFD_SOCKET) == -1) 60 if (errno != ENOENT) { 61 log_warn("control_init: unlink %s", OSPFD_SOCKET); 62 close(fd); 63 return (-1); 64 } 65 66 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH); 67 if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) { 68 log_warn("control_init: bind: %s", OSPFD_SOCKET); 69 close(fd); 70 umask(old_umask); 71 return (-1); 72 } 73 umask(old_umask); 74 75 if (chmod(OSPFD_SOCKET, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) { 76 log_warn("control_init: chmod"); 77 close(fd); 78 (void)unlink(OSPFD_SOCKET); 79 return (-1); 80 } 81 82 session_socket_blockmode(fd, BM_NONBLOCK); 83 control_state.fd = fd; 84 85 return (0); 86 } 87 88 int 89 control_listen(void) 90 { 91 92 if (listen(control_state.fd, CONTROL_BACKLOG) == -1) { 93 log_warn("control_listen: listen"); 94 return (-1); 95 } 96 97 event_set(&control_state.ev, control_state.fd, EV_READ | EV_PERSIST, 98 control_accept, NULL); 99 event_add(&control_state.ev, NULL); 100 101 return (0); 102 } 103 104 void 105 control_cleanup(void) 106 { 107 108 unlink(OSPFD_SOCKET); 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 len = sizeof(sun); 121 if ((connfd = accept(listenfd, 122 (struct sockaddr *)&sun, &len)) == -1) { 123 if (errno != EWOULDBLOCK && errno != EINTR) 124 log_warn("control_accept"); 125 return; 126 } 127 128 session_socket_blockmode(connfd, BM_NONBLOCK); 129 130 if ((c = malloc(sizeof(struct ctl_conn))) == NULL) { 131 log_warn("control_accept"); 132 close(connfd); 133 return; 134 } 135 136 imsg_init(&c->ibuf, connfd, control_dispatch_imsg); 137 c->ibuf.events = EV_READ; 138 event_set(&c->ibuf.ev, c->ibuf.fd, c->ibuf.events, 139 c->ibuf.handler, &c->ibuf); 140 event_add(&c->ibuf.ev, NULL); 141 142 TAILQ_INSERT_TAIL(&ctl_conns, c, entry); 143 } 144 145 struct ctl_conn * 146 control_connbyfd(int fd) 147 { 148 struct ctl_conn *c; 149 150 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->ibuf.fd != fd; 151 c = TAILQ_NEXT(c, entry)) 152 ; /* nothing */ 153 154 return (c); 155 } 156 157 struct ctl_conn * 158 control_connbypid(pid_t pid) 159 { 160 struct ctl_conn *c; 161 162 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->ibuf.pid != pid; 163 c = TAILQ_NEXT(c, entry)) 164 ; /* nothing */ 165 166 return (c); 167 } 168 169 void 170 control_close(int fd) 171 { 172 struct ctl_conn *c; 173 174 if ((c = control_connbyfd(fd)) == NULL) 175 log_warn("control_close: fd %d: not found", fd); 176 177 msgbuf_clear(&c->ibuf.w); 178 TAILQ_REMOVE(&ctl_conns, c, entry); 179 180 event_del(&c->ibuf.ev); 181 close(c->ibuf.fd); 182 free(c); 183 } 184 185 /* ARGSUSED */ 186 void 187 control_dispatch_imsg(int fd, short event, void *bula) 188 { 189 struct ctl_conn *c; 190 struct imsg imsg; 191 int n; 192 unsigned int ifidx; 193 194 if ((c = control_connbyfd(fd)) == NULL) { 195 log_warn("control_dispatch_imsg: fd %d: not found", fd); 196 return; 197 } 198 199 switch (event) { 200 case EV_READ: 201 if ((n = imsg_read(&c->ibuf)) == -1 || n == 0) { 202 control_close(fd); 203 return; 204 } 205 break; 206 case EV_WRITE: 207 if (msgbuf_write(&c->ibuf.w) < 0) { 208 control_close(fd); 209 return; 210 } 211 imsg_event_add(&c->ibuf); 212 return; 213 default: 214 fatalx("unknown event"); 215 } 216 217 for (;;) { 218 if ((n = imsg_get(&c->ibuf, &imsg)) == -1) { 219 control_close(fd); 220 return; 221 } 222 223 if (n == 0) 224 break; 225 226 switch (imsg.hdr.type) { 227 case IMSG_CTL_FIB_COUPLE: 228 case IMSG_CTL_FIB_DECOUPLE: 229 ospfe_fib_update(imsg.hdr.type); 230 /* FALLTHROUGH */ 231 case IMSG_CTL_RELOAD: 232 c->ibuf.pid = imsg.hdr.pid; 233 ospfe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0); 234 break; 235 case IMSG_CTL_KROUTE: 236 case IMSG_CTL_KROUTE_ADDR: 237 case IMSG_CTL_IFINFO: 238 c->ibuf.pid = imsg.hdr.pid; 239 ospfe_imsg_compose_parent(imsg.hdr.type, 240 imsg.hdr.pid, imsg.data, 241 imsg.hdr.len - IMSG_HEADER_SIZE); 242 break; 243 case IMSG_CTL_SHOW_INTERFACE: 244 if (imsg.hdr.len == IMSG_HEADER_SIZE + 245 sizeof(ifidx)) { 246 memcpy(&ifidx, imsg.data, sizeof(ifidx)); 247 ospfe_iface_ctl(c, ifidx); 248 imsg_compose(&c->ibuf, IMSG_CTL_END, 0, 249 0, NULL, 0); 250 } 251 break; 252 case IMSG_CTL_SHOW_DATABASE: 253 case IMSG_CTL_SHOW_DB_EXT: 254 case IMSG_CTL_SHOW_DB_NET: 255 case IMSG_CTL_SHOW_DB_RTR: 256 case IMSG_CTL_SHOW_DB_SELF: 257 case IMSG_CTL_SHOW_DB_SUM: 258 case IMSG_CTL_SHOW_DB_ASBR: 259 case IMSG_CTL_SHOW_RIB: 260 case IMSG_CTL_SHOW_SUM: 261 c->ibuf.pid = imsg.hdr.pid; 262 ospfe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid, 263 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 264 break; 265 case IMSG_CTL_SHOW_NBR: 266 ospfe_nbr_ctl(c); 267 break; 268 default: 269 log_debug("control_dispatch_imsg: " 270 "error handling imsg %d", imsg.hdr.type); 271 break; 272 } 273 imsg_free(&imsg); 274 } 275 276 imsg_event_add(&c->ibuf); 277 } 278 279 int 280 control_imsg_relay(struct imsg *imsg) 281 { 282 struct ctl_conn *c; 283 284 if ((c = control_connbypid(imsg->hdr.pid)) == NULL) 285 return (0); 286 287 return (imsg_compose(&c->ibuf, imsg->hdr.type, 0, imsg->hdr.pid, 288 imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE)); 289 } 290 291 void 292 session_socket_blockmode(int fd, enum blockmodes bm) 293 { 294 int flags; 295 296 if ((flags = fcntl(fd, F_GETFL, 0)) == -1) 297 fatal("fcntl F_GETFL"); 298 299 if (bm == BM_NONBLOCK) 300 flags |= O_NONBLOCK; 301 else 302 flags &= ~O_NONBLOCK; 303 304 if ((flags = fcntl(fd, F_SETFL, flags)) == -1) 305 fatal("fcntl F_SETFL"); 306 } 307