1 /* $OpenBSD: control.c,v 1.5 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 "igmp.h" 30 #include "dvmrpd.h" 31 #include "dvmrp.h" 32 #include "dvmrpe.h" 33 #include "log.h" 34 #include "control.h" 35 36 #define CONTROL_BACKLOG 5 37 38 int control_imsg_relay(struct imsg *imsg); 39 40 struct ctl_conn *control_connbyfd(int); 41 struct ctl_conn *control_connbypid(pid_t); 42 void control_close(int); 43 44 int 45 control_init(void) 46 { 47 struct sockaddr_un sun; 48 int fd; 49 mode_t old_umask; 50 51 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) { 52 log_warn("control_init: socket"); 53 return (-1); 54 } 55 56 bzero(&sun, sizeof(sun)); 57 sun.sun_family = AF_UNIX; 58 strlcpy(sun.sun_path, DVMRPD_SOCKET, sizeof(sun.sun_path)); 59 60 if (unlink(DVMRPD_SOCKET) == -1) 61 if (errno != ENOENT) { 62 log_warn("control_init: unlink %s", DVMRPD_SOCKET); 63 close(fd); 64 return (-1); 65 } 66 67 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH); 68 if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) { 69 log_warn("control_init: bind: %s", DVMRPD_SOCKET); 70 close(fd); 71 umask(old_umask); 72 return (-1); 73 } 74 umask(old_umask); 75 76 if (chmod(DVMRPD_SOCKET, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) { 77 log_warn("control_init: chmod"); 78 close(fd); 79 (void)unlink(DVMRPD_SOCKET); 80 return (-1); 81 } 82 83 session_socket_blockmode(fd, BM_NONBLOCK); 84 control_state.fd = fd; 85 86 return (0); 87 } 88 89 int 90 control_listen(void) 91 { 92 93 if (listen(control_state.fd, CONTROL_BACKLOG) == -1) { 94 log_warn("control_listen: listen"); 95 return (-1); 96 } 97 98 event_set(&control_state.ev, control_state.fd, EV_READ | EV_PERSIST, 99 control_accept, NULL); 100 event_add(&control_state.ev, NULL); 101 102 return (0); 103 } 104 105 void 106 control_cleanup(void) 107 { 108 unlink(DVMRPD_SOCKET); 109 } 110 111 /* ARGSUSED */ 112 void 113 control_accept(int listenfd, short event, void *bula) 114 { 115 int connfd; 116 socklen_t len; 117 struct sockaddr_un sun; 118 struct ctl_conn *c; 119 120 len = sizeof(sun); 121 if ((connfd = accept(listenfd, 122 (struct sockaddr *)&sun, &len)) == -1) { 123 if (errno != EWOULDBLOCK && errno != EINTR) 124 log_warn("control_accept"); 125 return; 126 } 127 128 session_socket_blockmode(connfd, BM_NONBLOCK); 129 130 if ((c = malloc(sizeof(struct ctl_conn))) == NULL) { 131 log_warn("control_accept"); 132 close(connfd); 133 return; 134 } 135 136 imsg_init(&c->ibuf, connfd, control_dispatch_imsg); 137 c->ibuf.events = EV_READ; 138 event_set(&c->ibuf.ev, c->ibuf.fd, c->ibuf.events, 139 c->ibuf.handler, &c->ibuf); 140 event_add(&c->ibuf.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->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->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->ibuf.w); 180 TAILQ_REMOVE(&ctl_conns, c, entry); 181 182 event_del(&c->ibuf.ev); 183 close(c->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 int 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 switch (event) { 202 case EV_READ: 203 if ((n = imsg_read(&c->ibuf)) == -1 || n == 0) { 204 control_close(fd); 205 return; 206 } 207 break; 208 case EV_WRITE: 209 if (msgbuf_write(&c->ibuf.w) < 0) { 210 control_close(fd); 211 return; 212 } 213 imsg_event_add(&c->ibuf); 214 return; 215 default: 216 fatalx("unknown event"); 217 } 218 219 for (;;) { 220 if ((n = imsg_get(&c->ibuf, &imsg)) == -1) { 221 control_close(fd); 222 return; 223 } 224 225 if (n == 0) 226 break; 227 228 switch (imsg.hdr.type) { 229 case IMSG_CTL_MFC_COUPLE: 230 case IMSG_CTL_MFC_DECOUPLE: 231 case IMSG_CTL_RELOAD: 232 dvmrpe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0); 233 break; 234 case IMSG_CTL_SHOW_IFACE: 235 if (imsg.hdr.len == IMSG_HEADER_SIZE + 236 sizeof(ifidx)) { 237 memcpy(&ifidx, imsg.data, sizeof(ifidx)); 238 dvmrpe_iface_ctl(c, ifidx); 239 imsg_compose(&c->ibuf, IMSG_CTL_END, 0, 240 0, NULL, 0); 241 } 242 break; 243 case IMSG_CTL_SHOW_IGMP: 244 if (imsg.hdr.len == IMSG_HEADER_SIZE + 245 sizeof(ifidx)) { 246 memcpy(&ifidx, imsg.data, sizeof(ifidx)); 247 dvmrpe_iface_igmp_ctl(c, ifidx); 248 imsg_compose(&c->ibuf, IMSG_CTL_END, 0, 249 0, NULL, 0); 250 } 251 break; 252 case IMSG_CTL_SHOW_NBR: 253 dvmrpe_nbr_ctl(c); 254 break; 255 case IMSG_CTL_SHOW_RIB: 256 case IMSG_CTL_SHOW_MFC: 257 case IMSG_CTL_SHOW_SUM: 258 c->ibuf.pid = imsg.hdr.pid; 259 dvmrpe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid, 260 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 261 break; 262 default: 263 log_debug("control_dispatch_imsg: " 264 "error handling imsg %d", imsg.hdr.type); 265 break; 266 } 267 imsg_free(&imsg); 268 } 269 270 imsg_event_add(&c->ibuf); 271 } 272 273 int 274 control_imsg_relay(struct imsg *imsg) 275 { 276 struct ctl_conn *c; 277 278 if ((c = control_connbypid(imsg->hdr.pid)) == NULL) 279 return (0); 280 281 return (imsg_compose(&c->ibuf, imsg->hdr.type, 0, imsg->hdr.pid, 282 imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE)); 283 } 284 285 void 286 session_socket_blockmode(int fd, enum blockmodes bm) 287 { 288 int flags; 289 290 if ((flags = fcntl(fd, F_GETFL, 0)) == -1) 291 fatal("fcntl F_GETFL"); 292 293 if (bm == BM_NONBLOCK) 294 flags |= O_NONBLOCK; 295 else 296 flags &= ~O_NONBLOCK; 297 298 if ((flags = fcntl(fd, F_SETFL, flags)) == -1) 299 fatal("fcntl F_SETFL"); 300 } 301