1 /* $OpenBSD: control.c,v 1.10 2009/06/06 08:20:55 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 "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->iev.ibuf, connfd); 136 c->iev.handler = control_dispatch_imsg; 137 c->iev.events = EV_READ; 138 event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events, 139 c->iev.handler, &c->iev); 140 event_add(&c->iev.ev, NULL); 141 142 TAILQ_INSERT_TAIL(&ctl_conns, c, entry); 143 } 144 145 struct ctl_conn * 146 control_connbyfd(int fd) 147 { 148 struct ctl_conn *c; 149 150 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.fd != fd; 151 c = TAILQ_NEXT(c, entry)) 152 ; /* nothing */ 153 154 return (c); 155 } 156 157 struct ctl_conn * 158 control_connbypid(pid_t pid) 159 { 160 struct ctl_conn *c; 161 162 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.pid != pid; 163 c = TAILQ_NEXT(c, entry)) 164 ; /* nothing */ 165 166 return (c); 167 } 168 169 void 170 control_close(int fd) 171 { 172 struct ctl_conn *c; 173 174 if ((c = control_connbyfd(fd)) == NULL) { 175 log_warn("control_close: fd %d: not found", fd); 176 return; 177 } 178 179 msgbuf_clear(&c->iev.ibuf.w); 180 TAILQ_REMOVE(&ctl_conns, c, entry); 181 182 event_del(&c->iev.ev); 183 close(c->iev.ibuf.fd); 184 free(c); 185 } 186 187 /* ARGSUSED */ 188 void 189 control_dispatch_imsg(int fd, short event, void *bula) 190 { 191 struct ctl_conn *c; 192 struct imsg imsg; 193 ssize_t n; 194 unsigned int ifidx; 195 196 if ((c = control_connbyfd(fd)) == NULL) { 197 log_warn("control_dispatch_imsg: fd %d: not found", fd); 198 return; 199 } 200 201 if (event & EV_READ) { 202 if ((n = imsg_read(&c->iev.ibuf)) == -1 || n == 0) { 203 control_close(fd); 204 return; 205 } 206 } 207 if (event & EV_WRITE) { 208 if (msgbuf_write(&c->iev.ibuf.w) == -1) { 209 control_close(fd); 210 return; 211 } 212 } 213 214 for (;;) { 215 if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) { 216 control_close(fd); 217 return; 218 } 219 220 if (n == 0) 221 break; 222 223 switch (imsg.hdr.type) { 224 case IMSG_CTL_SHOW_INTERFACE: 225 if (imsg.hdr.len - IMSG_HEADER_SIZE != sizeof(ifidx)) 226 return; 227 228 memcpy(&ifidx, imsg.data, sizeof(ifidx)); 229 ripe_iface_ctl(c, ifidx); 230 imsg_compose(&c->iev.ibuf, IMSG_CTL_END, 0, 0, 231 -1, NULL, 0); 232 233 break; 234 case IMSG_CTL_SHOW_RIB: 235 c->iev.ibuf.pid = imsg.hdr.pid; 236 ripe_imsg_compose_rde(imsg.hdr.type, 0, 237 imsg.hdr.pid, imsg.data, imsg.hdr.len - 238 IMSG_HEADER_SIZE); 239 break; 240 case IMSG_CTL_SHOW_NBR: 241 ripe_nbr_ctl(c); 242 break; 243 case IMSG_CTL_KROUTE_ADDR: 244 case IMSG_CTL_KROUTE: 245 case IMSG_CTL_IFINFO: 246 c->iev.ibuf.pid = imsg.hdr.pid; 247 ripe_imsg_compose_parent(imsg.hdr.type, 248 imsg.hdr.pid, imsg.data, 249 imsg.hdr.len - IMSG_HEADER_SIZE); 250 break; 251 case IMSG_CTL_FIB_COUPLE: 252 case IMSG_CTL_FIB_DECOUPLE: 253 case IMSG_CTL_RELOAD: 254 c->iev.ibuf.pid = imsg.hdr.pid; 255 ripe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0); 256 break; 257 default: 258 log_debug("control_dispatch_imsg: " 259 "error handling imsg %d", imsg.hdr.type); 260 break; 261 } 262 imsg_free(&imsg); 263 } 264 265 imsg_event_add(&c->iev); 266 } 267 268 int 269 control_imsg_relay(struct imsg *imsg) 270 { 271 struct ctl_conn *c; 272 273 if ((c = control_connbypid(imsg->hdr.pid)) == NULL) 274 return (0); 275 276 return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid, 277 -1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE)); 278 } 279 280 void 281 session_socket_blockmode(int fd, enum blockmodes bm) 282 { 283 int flags; 284 285 if ((flags = fcntl(fd, F_GETFL, 0)) == -1) 286 fatal("fcntl F_GETFL"); 287 288 if (bm == BM_NONBLOCK) 289 flags |= O_NONBLOCK; 290 else 291 flags &= ~O_NONBLOCK; 292 293 if ((flags = fcntl(fd, F_SETFL, flags)) == -1) 294 fatal("fcntl F_SETFL"); 295 } 296