1 /* $OpenBSD: control.c,v 1.14 2010/09/02 14:03:21 sobrado 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 struct ctl_conn *control_connbyfd(int); 39 struct ctl_conn *control_connbypid(pid_t); 40 void control_close(int); 41 42 int 43 control_init(void) 44 { 45 struct sockaddr_un sun; 46 int fd; 47 mode_t old_umask; 48 49 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) { 50 log_warn("control_init: socket"); 51 return (-1); 52 } 53 54 bzero(&sun, sizeof(sun)); 55 sun.sun_family = AF_UNIX; 56 strlcpy(sun.sun_path, DVMRPD_SOCKET, sizeof(sun.sun_path)); 57 58 if (unlink(DVMRPD_SOCKET) == -1) 59 if (errno != ENOENT) { 60 log_warn("control_init: unlink %s", DVMRPD_SOCKET); 61 close(fd); 62 return (-1); 63 } 64 65 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH); 66 if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) { 67 log_warn("control_init: bind: %s", DVMRPD_SOCKET); 68 close(fd); 69 umask(old_umask); 70 return (-1); 71 } 72 umask(old_umask); 73 74 if (chmod(DVMRPD_SOCKET, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) { 75 log_warn("control_init: chmod"); 76 close(fd); 77 (void)unlink(DVMRPD_SOCKET); 78 return (-1); 79 } 80 81 session_socket_blockmode(fd, BM_NONBLOCK); 82 control_state.fd = fd; 83 84 return (0); 85 } 86 87 int 88 control_listen(void) 89 { 90 91 if (listen(control_state.fd, CONTROL_BACKLOG) == -1) { 92 log_warn("control_listen: listen"); 93 return (-1); 94 } 95 96 event_set(&control_state.ev, control_state.fd, EV_READ | EV_PERSIST, 97 control_accept, NULL); 98 event_add(&control_state.ev, NULL); 99 100 return (0); 101 } 102 103 void 104 control_cleanup(void) 105 { 106 unlink(DVMRPD_SOCKET); 107 } 108 109 /* ARGSUSED */ 110 void 111 control_accept(int listenfd, short event, void *bula) 112 { 113 int connfd; 114 socklen_t len; 115 struct sockaddr_un sun; 116 struct ctl_conn *c; 117 118 len = sizeof(sun); 119 if ((connfd = accept(listenfd, 120 (struct sockaddr *)&sun, &len)) == -1) { 121 if (errno != EWOULDBLOCK && errno != EINTR) 122 log_warn("control_accept: accept"); 123 return; 124 } 125 126 session_socket_blockmode(connfd, BM_NONBLOCK); 127 128 if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) { 129 log_warn("control_accept"); 130 close(connfd); 131 return; 132 } 133 134 imsg_init(&c->iev.ibuf, connfd); 135 c->iev.handler = control_dispatch_imsg; 136 c->iev.events = EV_READ; 137 event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events, 138 c->iev.handler, &c->iev); 139 event_add(&c->iev.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->iev.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->iev.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->iev.ibuf.w); 179 TAILQ_REMOVE(&ctl_conns, c, entry); 180 181 event_del(&c->iev.ev); 182 close(c->iev.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 int n; 193 unsigned int ifidx; 194 int verbose; 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_MFC_COUPLE: 225 case IMSG_CTL_MFC_DECOUPLE: 226 case IMSG_CTL_RELOAD: 227 dvmrpe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0); 228 break; 229 case IMSG_CTL_SHOW_IFACE: 230 if (imsg.hdr.len == IMSG_HEADER_SIZE + 231 sizeof(ifidx)) { 232 memcpy(&ifidx, imsg.data, sizeof(ifidx)); 233 dvmrpe_iface_ctl(c, ifidx); 234 imsg_compose_event(&c->iev, IMSG_CTL_END, 0, 235 0, -1, NULL, 0); 236 } 237 break; 238 case IMSG_CTL_SHOW_IGMP: 239 if (imsg.hdr.len == IMSG_HEADER_SIZE + 240 sizeof(ifidx)) { 241 memcpy(&ifidx, imsg.data, sizeof(ifidx)); 242 dvmrpe_iface_igmp_ctl(c, ifidx); 243 imsg_compose_event(&c->iev, IMSG_CTL_END, 0, 244 0, -1, NULL, 0); 245 } 246 break; 247 case IMSG_CTL_SHOW_NBR: 248 dvmrpe_nbr_ctl(c); 249 break; 250 case IMSG_CTL_SHOW_RIB: 251 case IMSG_CTL_SHOW_MFC: 252 case IMSG_CTL_SHOW_SUM: 253 c->iev.ibuf.pid = imsg.hdr.pid; 254 dvmrpe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid, 255 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 256 break; 257 case IMSG_CTL_LOG_VERBOSE: 258 if (imsg.hdr.len != IMSG_HEADER_SIZE + 259 sizeof(verbose)) 260 break; 261 262 /* forward to other processes */ 263 dvmrpe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid, 264 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 265 dvmrpe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid, 266 imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); 267 268 memcpy(&verbose, imsg.data, sizeof(verbose)); 269 log_verbose(verbose); 270 break; 271 default: 272 log_debug("control_dispatch_imsg: " 273 "error handling imsg %d", imsg.hdr.type); 274 break; 275 } 276 imsg_free(&imsg); 277 } 278 279 imsg_event_add(&c->iev); 280 } 281 282 int 283 control_imsg_relay(struct imsg *imsg) 284 { 285 struct ctl_conn *c; 286 287 if ((c = control_connbypid(imsg->hdr.pid)) == NULL) 288 return (0); 289 290 return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid, 291 -1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE)); 292 } 293 294 void 295 session_socket_blockmode(int fd, enum blockmodes bm) 296 { 297 int flags; 298 299 if ((flags = fcntl(fd, F_GETFL, 0)) == -1) 300 fatal("fcntl F_GETFL"); 301 302 if (bm == BM_NONBLOCK) 303 flags |= O_NONBLOCK; 304 else 305 flags &= ~O_NONBLOCK; 306 307 if ((flags = fcntl(fd, F_SETFL, flags)) == -1) 308 fatal("fcntl F_SETFL"); 309 } 310