1 /* $OpenBSD: control.c,v 1.14 2014/07/11 16:43:33 krw 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 "ldpd.h" 30 #include "ldp.h" 31 #include "ldpe.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 control_fd; 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, LDPD_SOCKET, sizeof(sun.sun_path)); 58 59 if (unlink(LDPD_SOCKET) == -1) 60 if (errno != ENOENT) { 61 log_warn("control_init: unlink %s", LDPD_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", LDPD_SOCKET); 69 close(fd); 70 umask(old_umask); 71 return (-1); 72 } 73 umask(old_umask); 74 75 if (chmod(LDPD_SOCKET, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) { 76 log_warn("control_init: chmod"); 77 close(fd); 78 (void)unlink(LDPD_SOCKET); 79 return (-1); 80 } 81 82 session_socket_blockmode(fd, BM_NONBLOCK); 83 control_fd = fd; 84 85 return (0); 86 } 87 88 int 89 control_listen(void) 90 { 91 92 if (listen(control_fd, CONTROL_BACKLOG) == -1) { 93 log_warn("control_listen: listen"); 94 return (-1); 95 } 96 97 return (accept_add(control_fd, control_accept, NULL)); 98 } 99 100 void 101 control_cleanup(void) 102 { 103 unlink(LDPD_SOCKET); 104 } 105 106 /* ARGSUSED */ 107 void 108 control_accept(int listenfd, short event, void *bula) 109 { 110 int connfd; 111 socklen_t len; 112 struct sockaddr_un sun; 113 struct ctl_conn *c; 114 115 len = sizeof(sun); 116 if ((connfd = accept(listenfd, (struct sockaddr *)&sun, &len)) == -1) { 117 /* 118 * Pause accept if we are out of file descriptors, or 119 * libevent will haunt us here too. 120 */ 121 if (errno == ENFILE || errno == EMFILE) 122 accept_pause(); 123 else if (errno != EWOULDBLOCK && errno != EINTR && 124 errno != ECONNABORTED) 125 log_warn("control_accept: accept"); 126 return; 127 } 128 129 session_socket_blockmode(connfd, BM_NONBLOCK); 130 131 if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) { 132 log_warn("control_accept"); 133 close(connfd); 134 return; 135 } 136 137 imsg_init(&c->iev.ibuf, connfd); 138 c->iev.handler = control_dispatch_imsg; 139 c->iev.events = EV_READ; 140 event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events, 141 c->iev.handler, &c->iev); 142 event_add(&c->iev.ev, NULL); 143 144 TAILQ_INSERT_TAIL(&ctl_conns, c, entry); 145 } 146 147 struct ctl_conn * 148 control_connbyfd(int fd) 149 { 150 struct ctl_conn *c; 151 152 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.fd != fd; 153 c = TAILQ_NEXT(c, entry)) 154 ; /* nothing */ 155 156 return (c); 157 } 158 159 struct ctl_conn * 160 control_connbypid(pid_t pid) 161 { 162 struct ctl_conn *c; 163 164 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.pid != pid; 165 c = TAILQ_NEXT(c, entry)) 166 ; /* nothing */ 167 168 return (c); 169 } 170 171 void 172 control_close(int fd) 173 { 174 struct ctl_conn *c; 175 176 if ((c = control_connbyfd(fd)) == NULL) { 177 log_warn("control_close: fd %d: not found", fd); 178 return; 179 } 180 181 msgbuf_clear(&c->iev.ibuf.w); 182 TAILQ_REMOVE(&ctl_conns, c, entry); 183 184 event_del(&c->iev.ev); 185 close(c->iev.ibuf.fd); 186 free(c); 187 accept_unpause(); 188 } 189 190 /* ARGSUSED */ 191 void 192 control_dispatch_imsg(int fd, short event, void *bula) 193 { 194 struct ctl_conn *c; 195 struct imsg imsg; 196 int n; 197 unsigned int ifidx; 198 int verbose; 199 200 if ((c = control_connbyfd(fd)) == NULL) { 201 log_warn("control_dispatch_imsg: fd %d: not found", fd); 202 return; 203 } 204 205 if (event & EV_READ) { 206 if ((n = imsg_read(&c->iev.ibuf)) == -1 || n == 0) { 207 control_close(fd); 208 return; 209 } 210 } 211 if (event & EV_WRITE) { 212 if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) { 213 control_close(fd); 214 return; 215 } 216 } 217 218 for (;;) { 219 if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) { 220 control_close(fd); 221 return; 222 } 223 224 if (n == 0) 225 break; 226 227 switch (imsg.hdr.type) { 228 case IMSG_CTL_FIB_COUPLE: 229 case IMSG_CTL_FIB_DECOUPLE: 230 case IMSG_CTL_RELOAD: 231 c->iev.ibuf.pid = imsg.hdr.pid; 232 ldpe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0); 233 break; 234 case IMSG_CTL_KROUTE: 235 case IMSG_CTL_KROUTE_ADDR: 236 case IMSG_CTL_IFINFO: 237 c->iev.ibuf.pid = imsg.hdr.pid; 238 ldpe_imsg_compose_parent(imsg.hdr.type, 239 imsg.hdr.pid, imsg.data, 240 imsg.hdr.len - IMSG_HEADER_SIZE); 241 break; 242 case IMSG_CTL_SHOW_INTERFACE: 243 if (imsg.hdr.len == IMSG_HEADER_SIZE + 244 sizeof(ifidx)) { 245 memcpy(&ifidx, imsg.data, sizeof(ifidx)); 246 ldpe_iface_ctl(c, ifidx); 247 imsg_compose_event(&c->iev, IMSG_CTL_END, 0, 248 0, -1, NULL, 0); 249 } 250 break; 251 case IMSG_CTL_SHOW_DISCOVERY: 252 ldpe_adj_ctl(c); 253 break; 254 case IMSG_CTL_SHOW_LIB: 255 c->iev.ibuf.pid = imsg.hdr.pid; 256 ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid, 257 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 258 break; 259 case IMSG_CTL_SHOW_NBR: 260 ldpe_nbr_ctl(c); 261 break; 262 case IMSG_CTL_LOG_VERBOSE: 263 if (imsg.hdr.len != IMSG_HEADER_SIZE + 264 sizeof(verbose)) 265 break; 266 267 /* forward to other processes */ 268 ldpe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid, 269 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 270 ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid, 271 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 272 273 memcpy(&verbose, imsg.data, sizeof(verbose)); 274 log_verbose(verbose); 275 break; 276 default: 277 log_debug("control_dispatch_imsg: " 278 "error handling imsg %d", imsg.hdr.type); 279 break; 280 } 281 imsg_free(&imsg); 282 } 283 284 imsg_event_add(&c->iev); 285 } 286 287 int 288 control_imsg_relay(struct imsg *imsg) 289 { 290 struct ctl_conn *c; 291 292 if ((c = control_connbypid(imsg->hdr.pid)) == NULL) 293 return (0); 294 295 return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid, 296 -1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE)); 297 } 298 299 void 300 session_socket_blockmode(int fd, enum blockmodes bm) 301 { 302 int flags; 303 304 if ((flags = fcntl(fd, F_GETFL, 0)) == -1) 305 fatal("fcntl F_GETFL"); 306 307 if (bm == BM_NONBLOCK) 308 flags |= O_NONBLOCK; 309 else 310 flags &= ~O_NONBLOCK; 311 312 if ((flags = fcntl(fd, F_SETFL, flags)) == -1) 313 fatal("fcntl F_SETFL"); 314 } 315