1 /* $OpenBSD: control.c,v 1.1 2006/06/01 14:12:20 norby 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 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); 175 176 msgbuf_clear(&c->ibuf.w); 177 TAILQ_REMOVE(&ctl_conns, c, entry); 178 179 event_del(&c->ibuf.ev); 180 close(c->ibuf.fd); 181 free(c); 182 } 183 184 /* ARGSUSED */ 185 void 186 control_dispatch_imsg(int fd, short event, void *bula) 187 { 188 struct ctl_conn *c; 189 struct imsg imsg; 190 int n; 191 unsigned int ifidx; 192 193 if ((c = control_connbyfd(fd)) == NULL) { 194 log_warn("control_dispatch_imsg: fd %d: not found", fd); 195 return; 196 } 197 198 switch (event) { 199 case EV_READ: 200 if ((n = imsg_read(&c->ibuf)) <= 0) { 201 control_close(fd); 202 return; 203 } 204 break; 205 case EV_WRITE: 206 if (msgbuf_write(&c->ibuf.w) < 0) { 207 control_close(fd); 208 return; 209 } 210 imsg_event_add(&c->ibuf); 211 return; 212 default: 213 fatalx("unknown event"); 214 } 215 216 for (;;) { 217 if ((n = imsg_get(&c->ibuf, &imsg)) == -1) { 218 control_close(fd); 219 return; 220 } 221 222 if (n == 0) 223 break; 224 225 switch (imsg.hdr.type) { 226 case IMSG_CTL_MFC_COUPLE: 227 case IMSG_CTL_MFC_DECOUPLE: 228 case IMSG_CTL_RELOAD: 229 dvmrpe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0); 230 break; 231 case IMSG_CTL_SHOW_IFACE: 232 if (imsg.hdr.len == IMSG_HEADER_SIZE + 233 sizeof(ifidx)) { 234 memcpy(&ifidx, imsg.data, sizeof(ifidx)); 235 dvmrpe_iface_ctl(c, ifidx); 236 imsg_compose(&c->ibuf, IMSG_CTL_END, 0, 237 0, NULL, 0); 238 } 239 break; 240 case IMSG_CTL_SHOW_IGMP: 241 if (imsg.hdr.len == IMSG_HEADER_SIZE + 242 sizeof(ifidx)) { 243 memcpy(&ifidx, imsg.data, sizeof(ifidx)); 244 dvmrpe_iface_igmp_ctl(c, ifidx); 245 imsg_compose(&c->ibuf, IMSG_CTL_END, 0, 246 0, NULL, 0); 247 } 248 break; 249 case IMSG_CTL_SHOW_NBR: 250 dvmrpe_nbr_ctl(c); 251 break; 252 case IMSG_CTL_SHOW_RIB: 253 case IMSG_CTL_SHOW_MFC: 254 case IMSG_CTL_SHOW_SUM: 255 c->ibuf.pid = imsg.hdr.pid; 256 dvmrpe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid, 257 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 258 break; 259 default: 260 log_debug("control_dispatch_imsg: " 261 "error handling imsg %d", imsg.hdr.type); 262 break; 263 } 264 imsg_free(&imsg); 265 } 266 267 imsg_event_add(&c->ibuf); 268 } 269 270 int 271 control_imsg_relay(struct imsg *imsg) 272 { 273 struct ctl_conn *c; 274 275 if ((c = control_connbypid(imsg->hdr.pid)) == NULL) 276 return (0); 277 278 return (imsg_compose(&c->ibuf, imsg->hdr.type, 0, imsg->hdr.pid, 279 imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE)); 280 } 281 282 void 283 session_socket_blockmode(int fd, enum blockmodes bm) 284 { 285 int flags; 286 287 if ((flags = fcntl(fd, F_GETFL, 0)) == -1) 288 fatal("fnctl F_GETFL"); 289 290 if (bm == BM_NONBLOCK) 291 flags |= O_NONBLOCK; 292 else 293 flags &= ~O_NONBLOCK; 294 295 if ((flags = fcntl(fd, F_SETFL, flags)) == -1) 296 fatal("fnctl F_SETFL"); 297 } 298