1 /* $OpenBSD: control.c,v 1.7 2009/02/25 17:09:55 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 "ripd.h" 30 #include "rip.h" 31 #include "ripe.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, RIPD_SOCKET, sizeof(sun.sun_path)); 58 59 if (unlink(RIPD_SOCKET) == -1) 60 if (errno != ENOENT) { 61 log_warn("control_init: unlink %s", RIPD_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", RIPD_SOCKET); 69 close(fd); 70 umask(old_umask); 71 return (-1); 72 } 73 umask(old_umask); 74 75 if (chmod(RIPD_SOCKET, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) { 76 log_warn("control_init: chmod"); 77 close(fd); 78 (void)unlink(RIPD_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 unlink(RIPD_SOCKET); 108 } 109 110 /* ARGSUSED */ 111 void 112 control_accept(int listenfd, short event, void *bula) 113 { 114 int connfd; 115 socklen_t len; 116 struct sockaddr_un sun; 117 struct ctl_conn *c; 118 119 len = sizeof(sun); 120 if ((connfd = accept(listenfd, 121 (struct sockaddr *)&sun, &len)) == -1) { 122 if (errno != EWOULDBLOCK && errno != EINTR) 123 log_warn("control_accept"); 124 return; 125 } 126 127 session_socket_blockmode(connfd, BM_NONBLOCK); 128 129 if ((c = malloc(sizeof(struct ctl_conn))) == NULL) { 130 log_warn("control_accept"); 131 close(connfd); 132 return; 133 } 134 135 imsg_init(&c->ibuf, connfd, control_dispatch_imsg); 136 c->ibuf.events = EV_READ; 137 event_set(&c->ibuf.ev, c->ibuf.fd, c->ibuf.events, 138 c->ibuf.handler, &c->ibuf); 139 event_add(&c->ibuf.ev, NULL); 140 141 TAILQ_INSERT_TAIL(&ctl_conns, c, entry); 142 } 143 144 struct ctl_conn * 145 control_connbyfd(int fd) 146 { 147 struct ctl_conn *c; 148 149 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->ibuf.fd != fd; 150 c = TAILQ_NEXT(c, entry)) 151 ; /* nothing */ 152 153 return (c); 154 } 155 156 struct ctl_conn * 157 control_connbypid(pid_t pid) 158 { 159 struct ctl_conn *c; 160 161 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->ibuf.pid != pid; 162 c = TAILQ_NEXT(c, entry)) 163 ; /* nothing */ 164 165 return (c); 166 } 167 168 void 169 control_close(int fd) 170 { 171 struct ctl_conn *c; 172 173 if ((c = control_connbyfd(fd)) == NULL) { 174 log_warn("control_close: fd %d: not found", fd); 175 return; 176 } 177 178 msgbuf_clear(&c->ibuf.w); 179 TAILQ_REMOVE(&ctl_conns, c, entry); 180 181 event_del(&c->ibuf.ev); 182 close(c->ibuf.fd); 183 free(c); 184 } 185 186 /* ARGSUSED */ 187 void 188 control_dispatch_imsg(int fd, short event, void *bula) 189 { 190 struct ctl_conn *c; 191 struct imsg imsg; 192 ssize_t n; 193 unsigned int ifidx; 194 195 if ((c = control_connbyfd(fd)) == NULL) { 196 log_warn("control_dispatch_imsg: fd %d: not found", fd); 197 return; 198 } 199 200 switch (event) { 201 case EV_READ: 202 if ((n = imsg_read(&c->ibuf)) == -1 || n == 0) { 203 control_close(fd); 204 return; 205 } 206 break; 207 case EV_WRITE: 208 if (msgbuf_write(&c->ibuf.w) < 0) { 209 control_close(fd); 210 return; 211 } 212 imsg_event_add(&c->ibuf); 213 return; 214 default: 215 fatalx("unknown event"); 216 } 217 218 for (;;) { 219 if ((n = imsg_get(&c->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_SHOW_INTERFACE: 229 if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(ifidx)) 230 return; 231 232 memcpy(&ifidx, imsg.data, sizeof(ifidx)); 233 ripe_iface_ctl(c, ifidx); 234 imsg_compose(&c->ibuf, IMSG_CTL_END, 0, 0, NULL, 0); 235 236 break; 237 case IMSG_CTL_SHOW_RIB: 238 c->ibuf.pid = imsg.hdr.pid; 239 ripe_imsg_compose_rde(imsg.hdr.type, 0, 240 imsg.hdr.pid, imsg.data, imsg.hdr.len - 241 IMSG_HEADER_SIZE); 242 break; 243 case IMSG_CTL_SHOW_NBR: 244 ripe_nbr_ctl(c); 245 break; 246 case IMSG_CTL_KROUTE_ADDR: 247 case IMSG_CTL_KROUTE: 248 case IMSG_CTL_IFINFO: 249 c->ibuf.pid = imsg.hdr.pid; 250 ripe_imsg_compose_parent(imsg.hdr.type, 251 imsg.hdr.pid, imsg.data, 252 imsg.hdr.len - IMSG_HEADER_SIZE); 253 break; 254 case IMSG_CTL_FIB_COUPLE: 255 case IMSG_CTL_FIB_DECOUPLE: 256 case IMSG_CTL_RELOAD: 257 c->ibuf.pid = imsg.hdr.pid; 258 ripe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0); 259 break; 260 default: 261 log_debug("control_dispatch_imsg: " 262 "error handling imsg %d", imsg.hdr.type); 263 break; 264 } 265 imsg_free(&imsg); 266 } 267 268 imsg_event_add(&c->ibuf); 269 } 270 271 int 272 control_imsg_relay(struct imsg *imsg) 273 { 274 struct ctl_conn *c; 275 276 if ((c = control_connbypid(imsg->hdr.pid)) == NULL) 277 return (0); 278 279 return (imsg_compose(&c->ibuf, imsg->hdr.type, 0, imsg->hdr.pid, 280 imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE)); 281 } 282 283 void 284 session_socket_blockmode(int fd, enum blockmodes bm) 285 { 286 int flags; 287 288 if ((flags = fcntl(fd, F_GETFL, 0)) == -1) 289 fatal("fcntl F_GETFL"); 290 291 if (bm == BM_NONBLOCK) 292 flags |= O_NONBLOCK; 293 else 294 flags &= ~O_NONBLOCK; 295 296 if ((flags = fcntl(fd, F_SETFL, flags)) == -1) 297 fatal("fcntl F_SETFL"); 298 } 299