1 /* $OpenBSD: control.c,v 1.27 2009/06/06 07:31:26 eric 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(char *path) 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, path, sizeof(sun.sun_path)); 58 59 if (unlink(path) == -1) 60 if (errno != ENOENT) { 61 log_warn("control_init: unlink %s", path); 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", path); 69 close(fd); 70 umask(old_umask); 71 return (-1); 72 } 73 umask(old_umask); 74 75 if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) { 76 log_warn("control_init: chmod"); 77 close(fd); 78 (void)unlink(path); 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(char *path) 106 { 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 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->iev.ibuf, connfd); 137 c->iev.handler = control_dispatch_imsg; 138 c->iev.events = EV_READ; 139 event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events, 140 c->iev.handler, &c->iev); 141 event_add(&c->iev.ev, NULL); 142 143 TAILQ_INSERT_TAIL(&ctl_conns, c, entry); 144 } 145 146 struct ctl_conn * 147 control_connbyfd(int fd) 148 { 149 struct ctl_conn *c; 150 151 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.fd != fd; 152 c = TAILQ_NEXT(c, entry)) 153 ; /* nothing */ 154 155 return (c); 156 } 157 158 struct ctl_conn * 159 control_connbypid(pid_t pid) 160 { 161 struct ctl_conn *c; 162 163 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.pid != pid; 164 c = TAILQ_NEXT(c, entry)) 165 ; /* nothing */ 166 167 return (c); 168 } 169 170 void 171 control_close(int fd) 172 { 173 struct ctl_conn *c; 174 175 if ((c = control_connbyfd(fd)) == NULL) { 176 log_warn("control_close: fd %d: not found", fd); 177 return; 178 } 179 180 msgbuf_clear(&c->iev.ibuf.w); 181 TAILQ_REMOVE(&ctl_conns, c, entry); 182 183 event_del(&c->iev.ev); 184 close(c->iev.ibuf.fd); 185 free(c); 186 } 187 188 /* ARGSUSED */ 189 void 190 control_dispatch_imsg(int fd, short event, void *bula) 191 { 192 struct ctl_conn *c; 193 struct imsg imsg; 194 ssize_t n; 195 unsigned int ifidx; 196 197 if ((c = control_connbyfd(fd)) == NULL) { 198 log_warn("control_dispatch_imsg: fd %d: not found", fd); 199 return; 200 } 201 202 if (event & EV_READ) { 203 if ((n = imsg_read(&c->iev.ibuf)) == -1 || n == 0) { 204 control_close(fd); 205 return; 206 } 207 } 208 if (event & EV_WRITE) { 209 if (msgbuf_write(&c->iev.ibuf.w) == -1) { 210 control_close(fd); 211 return; 212 } 213 } 214 215 for (;;) { 216 if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) { 217 control_close(fd); 218 return; 219 } 220 221 if (n == 0) 222 break; 223 224 switch (imsg.hdr.type) { 225 case IMSG_CTL_FIB_COUPLE: 226 case IMSG_CTL_FIB_DECOUPLE: 227 ospfe_fib_update(imsg.hdr.type); 228 /* FALLTHROUGH */ 229 case IMSG_CTL_RELOAD: 230 c->iev.ibuf.pid = imsg.hdr.pid; 231 ospfe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0); 232 break; 233 case IMSG_CTL_KROUTE: 234 case IMSG_CTL_KROUTE_ADDR: 235 case IMSG_CTL_IFINFO: 236 c->iev.ibuf.pid = imsg.hdr.pid; 237 ospfe_imsg_compose_parent(imsg.hdr.type, 238 imsg.hdr.pid, imsg.data, 239 imsg.hdr.len - IMSG_HEADER_SIZE); 240 break; 241 case IMSG_CTL_SHOW_INTERFACE: 242 if (imsg.hdr.len == IMSG_HEADER_SIZE + 243 sizeof(ifidx)) { 244 memcpy(&ifidx, imsg.data, sizeof(ifidx)); 245 ospfe_iface_ctl(c, ifidx); 246 imsg_compose_event(&c->iev, IMSG_CTL_END, 0, 247 0, -1, NULL, 0); 248 } 249 break; 250 case IMSG_CTL_SHOW_DATABASE: 251 case IMSG_CTL_SHOW_DB_EXT: 252 case IMSG_CTL_SHOW_DB_NET: 253 case IMSG_CTL_SHOW_DB_RTR: 254 case IMSG_CTL_SHOW_DB_SELF: 255 case IMSG_CTL_SHOW_DB_SUM: 256 case IMSG_CTL_SHOW_DB_ASBR: 257 case IMSG_CTL_SHOW_RIB: 258 case IMSG_CTL_SHOW_SUM: 259 c->iev.ibuf.pid = imsg.hdr.pid; 260 ospfe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid, 261 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 262 break; 263 case IMSG_CTL_SHOW_NBR: 264 ospfe_nbr_ctl(c); 265 break; 266 default: 267 log_debug("control_dispatch_imsg: " 268 "error handling imsg %d", imsg.hdr.type); 269 break; 270 } 271 imsg_free(&imsg); 272 } 273 274 imsg_event_add(&c->iev); 275 } 276 277 int 278 control_imsg_relay(struct imsg *imsg) 279 { 280 struct ctl_conn *c; 281 282 if ((c = control_connbypid(imsg->hdr.pid)) == NULL) 283 return (0); 284 285 return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid, 286 -1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE)); 287 } 288 289 void 290 session_socket_blockmode(int fd, enum blockmodes bm) 291 { 292 int flags; 293 294 if ((flags = fcntl(fd, F_GETFL, 0)) == -1) 295 fatal("fcntl F_GETFL"); 296 297 if (bm == BM_NONBLOCK) 298 flags |= O_NONBLOCK; 299 else 300 flags &= ~O_NONBLOCK; 301 302 if ((flags = fcntl(fd, F_SETFL, flags)) == -1) 303 fatal("fcntl F_SETFL"); 304 } 305