1 /* $OpenBSD: control.c,v 1.9 2010/09/01 13:54:54 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 42 control_init(void) 43 { 44 struct sockaddr_un sun; 45 int fd; 46 mode_t old_umask; 47 48 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) { 49 log_warn("control_init: socket"); 50 return (-1); 51 } 52 53 bzero(&sun, sizeof(sun)); 54 sun.sun_family = AF_UNIX; 55 strlcpy(sun.sun_path, LDPD_SOCKET, sizeof(sun.sun_path)); 56 57 if (unlink(LDPD_SOCKET) == -1) 58 if (errno != ENOENT) { 59 log_warn("control_init: unlink %s", LDPD_SOCKET); 60 close(fd); 61 return (-1); 62 } 63 64 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH); 65 if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) { 66 log_warn("control_init: bind: %s", LDPD_SOCKET); 67 close(fd); 68 umask(old_umask); 69 return (-1); 70 } 71 umask(old_umask); 72 73 if (chmod(LDPD_SOCKET, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) { 74 log_warn("control_init: chmod"); 75 close(fd); 76 (void)unlink(LDPD_SOCKET); 77 return (-1); 78 } 79 80 session_socket_blockmode(fd, BM_NONBLOCK); 81 control_state.fd = fd; 82 83 return (0); 84 } 85 86 int 87 control_listen(void) 88 { 89 90 if (listen(control_state.fd, CONTROL_BACKLOG) == -1) { 91 log_warn("control_listen: listen"); 92 return (-1); 93 } 94 95 event_set(&control_state.ev, control_state.fd, EV_READ | EV_PERSIST, 96 control_accept, NULL); 97 event_add(&control_state.ev, NULL); 98 99 return (0); 100 } 101 102 void 103 control_cleanup(void) 104 { 105 unlink(LDPD_SOCKET); 106 } 107 108 /* ARGSUSED */ 109 void 110 control_accept(int listenfd, short event, void *bula) 111 { 112 int connfd; 113 socklen_t len; 114 struct sockaddr_un sun; 115 struct ctl_conn *c; 116 117 len = sizeof(sun); 118 if ((connfd = accept(listenfd, 119 (struct sockaddr *)&sun, &len)) == -1) { 120 if (errno != EWOULDBLOCK && errno != EINTR) 121 log_warn("control_accept: accept"); 122 return; 123 } 124 125 session_socket_blockmode(connfd, BM_NONBLOCK); 126 127 if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) { 128 log_warn("control_accept"); 129 close(connfd); 130 return; 131 } 132 133 imsg_init(&c->iev.ibuf, connfd); 134 c->iev.handler = control_dispatch_imsg; 135 c->iev.events = EV_READ; 136 event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events, 137 c->iev.handler, &c->iev); 138 event_add(&c->iev.ev, NULL); 139 140 TAILQ_INSERT_TAIL(&ctl_conns, c, entry); 141 } 142 143 struct ctl_conn * 144 control_connbyfd(int fd) 145 { 146 struct ctl_conn *c; 147 148 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.fd != fd; 149 c = TAILQ_NEXT(c, entry)) 150 ; /* nothing */ 151 152 return (c); 153 } 154 155 struct ctl_conn * 156 control_connbypid(pid_t pid) 157 { 158 struct ctl_conn *c; 159 160 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.pid != pid; 161 c = TAILQ_NEXT(c, entry)) 162 ; /* nothing */ 163 164 return (c); 165 } 166 167 void 168 control_close(int fd) 169 { 170 struct ctl_conn *c; 171 172 if ((c = control_connbyfd(fd)) == NULL) { 173 log_warn("control_close: fd %d: not found", fd); 174 return; 175 } 176 177 msgbuf_clear(&c->iev.ibuf.w); 178 TAILQ_REMOVE(&ctl_conns, c, entry); 179 180 event_del(&c->iev.ev); 181 close(c->iev.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 int verbose; 194 195 if ((c = control_connbyfd(fd)) == NULL) { 196 log_warn("control_dispatch_imsg: fd %d: not found", fd); 197 return; 198 } 199 200 if (event & EV_READ) { 201 if ((n = imsg_read(&c->iev.ibuf)) == -1 || n == 0) { 202 control_close(fd); 203 return; 204 } 205 } 206 if (event & EV_WRITE) { 207 if (msgbuf_write(&c->iev.ibuf.w) == -1) { 208 control_close(fd); 209 return; 210 } 211 } 212 213 for (;;) { 214 if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) { 215 control_close(fd); 216 return; 217 } 218 219 if (n == 0) 220 break; 221 222 switch (imsg.hdr.type) { 223 case IMSG_CTL_FIB_COUPLE: 224 case IMSG_CTL_FIB_DECOUPLE: 225 case IMSG_CTL_RELOAD: 226 c->iev.ibuf.pid = imsg.hdr.pid; 227 ldpe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0); 228 break; 229 case IMSG_CTL_KROUTE: 230 case IMSG_CTL_KROUTE_ADDR: 231 case IMSG_CTL_IFINFO: 232 c->iev.ibuf.pid = imsg.hdr.pid; 233 ldpe_imsg_compose_parent(imsg.hdr.type, 234 imsg.hdr.pid, imsg.data, 235 imsg.hdr.len - IMSG_HEADER_SIZE); 236 break; 237 case IMSG_CTL_SHOW_INTERFACE: 238 if (imsg.hdr.len == IMSG_HEADER_SIZE + 239 sizeof(ifidx)) { 240 memcpy(&ifidx, imsg.data, sizeof(ifidx)); 241 ldpe_iface_ctl(c, ifidx); 242 imsg_compose_event(&c->iev, IMSG_CTL_END, 0, 243 0, -1, NULL, 0); 244 } 245 break; 246 case IMSG_CTL_SHOW_LIB: 247 c->iev.ibuf.pid = imsg.hdr.pid; 248 ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid, 249 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 250 break; 251 case IMSG_CTL_SHOW_NBR: 252 ldpe_nbr_ctl(c); 253 break; 254 case IMSG_CTL_LOG_VERBOSE: 255 if (imsg.hdr.len != IMSG_HEADER_SIZE + 256 sizeof(verbose)) 257 break; 258 259 /* forward to other processes */ 260 ldpe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid, 261 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 262 ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid, 263 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 264 265 memcpy(&verbose, imsg.data, sizeof(verbose)); 266 log_verbose(verbose); 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->iev); 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_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid, 288 -1, 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