1 /* $OpenBSD: control.c,v 1.10 2012/04/12 17:33:43 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 "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 log_warn("control_accept: accept"); 125 return; 126 } 127 128 session_socket_blockmode(connfd, BM_NONBLOCK); 129 130 if ((c = calloc(1, 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 accept_unpause(); 187 } 188 189 /* ARGSUSED */ 190 void 191 control_dispatch_imsg(int fd, short event, void *bula) 192 { 193 struct ctl_conn *c; 194 struct imsg imsg; 195 int n; 196 unsigned int ifidx; 197 int verbose; 198 199 if ((c = control_connbyfd(fd)) == NULL) { 200 log_warn("control_dispatch_imsg: fd %d: not found", fd); 201 return; 202 } 203 204 if (event & EV_READ) { 205 if ((n = imsg_read(&c->iev.ibuf)) == -1 || n == 0) { 206 control_close(fd); 207 return; 208 } 209 } 210 if (event & EV_WRITE) { 211 if (msgbuf_write(&c->iev.ibuf.w) == -1) { 212 control_close(fd); 213 return; 214 } 215 } 216 217 for (;;) { 218 if ((n = imsg_get(&c->iev.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 case IMSG_CTL_RELOAD: 230 c->iev.ibuf.pid = imsg.hdr.pid; 231 ldpe_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 ldpe_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 ldpe_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_LIB: 251 c->iev.ibuf.pid = imsg.hdr.pid; 252 ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid, 253 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 254 break; 255 case IMSG_CTL_SHOW_NBR: 256 ldpe_nbr_ctl(c); 257 break; 258 case IMSG_CTL_LOG_VERBOSE: 259 if (imsg.hdr.len != IMSG_HEADER_SIZE + 260 sizeof(verbose)) 261 break; 262 263 /* forward to other processes */ 264 ldpe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid, 265 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 266 ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid, 267 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 268 269 memcpy(&verbose, imsg.data, sizeof(verbose)); 270 log_verbose(verbose); 271 break; 272 default: 273 log_debug("control_dispatch_imsg: " 274 "error handling imsg %d", imsg.hdr.type); 275 break; 276 } 277 imsg_free(&imsg); 278 } 279 280 imsg_event_add(&c->iev); 281 } 282 283 int 284 control_imsg_relay(struct imsg *imsg) 285 { 286 struct ctl_conn *c; 287 288 if ((c = control_connbypid(imsg->hdr.pid)) == NULL) 289 return (0); 290 291 return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid, 292 -1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE)); 293 } 294 295 void 296 session_socket_blockmode(int fd, enum blockmodes bm) 297 { 298 int flags; 299 300 if ((flags = fcntl(fd, F_GETFL, 0)) == -1) 301 fatal("fcntl F_GETFL"); 302 303 if (bm == BM_NONBLOCK) 304 flags |= O_NONBLOCK; 305 else 306 flags &= ~O_NONBLOCK; 307 308 if ((flags = fcntl(fd, F_SETFL, flags)) == -1) 309 fatal("fcntl F_SETFL"); 310 } 311