1 /* $OpenBSD: control.c,v 1.8 2012/06/16 00:08:32 jmatthew Exp $ */ 2 3 /* 4 * Copyright (c) 2010 Martin Hedenfalk <martin@bzero.se> 5 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/queue.h> 21 #include <sys/param.h> 22 #include <sys/types.h> 23 #include <sys/stat.h> 24 #include <sys/socket.h> 25 #include <sys/un.h> 26 #include <sys/tree.h> 27 28 #include <net/if.h> 29 30 #include <errno.h> 31 #include <event.h> 32 #include <fcntl.h> 33 #include <signal.h> 34 #include <stdlib.h> 35 #include <string.h> 36 #include <unistd.h> 37 38 #include "ldapd.h" 39 40 #define CONTROL_BACKLOG 5 41 42 struct ctl_connlist ctl_conns; 43 44 struct ctl_conn *control_connbyfd(int); 45 void control_close(int, struct control_sock *); 46 static void control_imsgev(struct imsgev *iev, int code, struct imsg *imsg); 47 static void control_needfd(struct imsgev *iev); 48 49 void 50 control_init(struct control_sock *cs) 51 { 52 struct sockaddr_un sun; 53 int fd; 54 mode_t old_umask, mode; 55 56 if (cs->cs_name == NULL) 57 return; 58 59 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) 60 fatal("control_init: socket"); 61 62 bzero(&sun, sizeof(sun)); 63 sun.sun_family = AF_UNIX; 64 if (strlcpy(sun.sun_path, cs->cs_name, 65 sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) 66 fatalx("control_init: name too long"); 67 68 if (connect(fd, (struct sockaddr *)&sun, sizeof(sun)) == 0) 69 fatalx("control socket already listening"); 70 71 if (unlink(cs->cs_name) == -1 && errno != ENOENT) 72 fatal("control_init: unlink"); 73 74 if (cs->cs_restricted) { 75 old_umask = umask(S_IXUSR|S_IXGRP|S_IXOTH); 76 mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH; 77 } else { 78 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH); 79 mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP; 80 } 81 82 if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) { 83 (void)umask(old_umask); 84 fatal("control_init: bind"); 85 } 86 (void)umask(old_umask); 87 88 if (chmod(cs->cs_name, mode) == -1) { 89 (void)unlink(cs->cs_name); 90 fatal("control_init: chmod"); 91 } 92 93 fd_nonblock(fd); 94 cs->cs_fd = fd; 95 } 96 97 void 98 control_listen(struct control_sock *cs) 99 { 100 if (cs->cs_name == NULL) 101 return; 102 103 if (listen(cs->cs_fd, CONTROL_BACKLOG) == -1) 104 fatal("control_listen: listen"); 105 106 event_set(&cs->cs_ev, cs->cs_fd, EV_READ, 107 control_accept, cs); 108 event_add(&cs->cs_ev, NULL); 109 evtimer_set(&cs->cs_evt, control_accept, cs); 110 } 111 112 void 113 control_cleanup(struct control_sock *cs) 114 { 115 if (cs->cs_name == NULL) 116 return; 117 event_del(&cs->cs_ev); 118 event_del(&cs->cs_evt); 119 (void)unlink(cs->cs_name); 120 } 121 122 /* ARGSUSED */ 123 void 124 control_accept(int listenfd, short event, void *arg) 125 { 126 struct control_sock *cs = arg; 127 int connfd; 128 socklen_t len; 129 struct sockaddr_un sun; 130 struct ctl_conn *c; 131 132 event_add(&cs->cs_ev, NULL); 133 if ((event & EV_TIMEOUT)) 134 return; 135 136 len = sizeof(sun); 137 if ((connfd = accept_reserve(listenfd, 138 (struct sockaddr *)&sun, &len, FD_RESERVE)) == -1) { 139 /* 140 * Pause accept if we are out of file descriptors, or 141 * libevent will haunt us here too. 142 */ 143 if (errno == ENFILE || errno == EMFILE) { 144 struct timeval evtpause = { 1, 0 }; 145 146 event_del(&cs->cs_ev); 147 evtimer_add(&cs->cs_evt, &evtpause); 148 } else if (errno != EWOULDBLOCK && errno != EINTR) 149 log_warn("control_accept"); 150 return; 151 } 152 153 fd_nonblock(connfd); 154 155 if ((c = calloc(1, sizeof(*c))) == NULL) { 156 log_warn("control_accept"); 157 close(connfd); 158 return; 159 } 160 161 log_debug("accepted control fd %i", connfd); 162 TAILQ_INSERT_TAIL(&ctl_conns, c, entry); 163 imsgev_init(&c->iev, connfd, cs, control_imsgev, control_needfd); 164 } 165 166 struct ctl_conn * 167 control_connbyfd(int fd) 168 { 169 struct ctl_conn *c; 170 171 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.fd != fd; 172 c = TAILQ_NEXT(c, entry)) 173 ; /* nothing */ 174 175 return (c); 176 } 177 178 void 179 control_close(int fd, struct control_sock *cs) 180 { 181 struct ctl_conn *c; 182 183 if ((c = control_connbyfd(fd)) == NULL) { 184 log_warnx("control_close: fd %d: not found", fd); 185 return; 186 } 187 188 log_debug("close control fd %i", c->iev.ibuf.fd); 189 TAILQ_REMOVE(&ctl_conns, c, entry); 190 imsgev_clear(&c->iev); 191 192 /* Some file descriptors are available again. */ 193 if (evtimer_pending(&cs->cs_evt, NULL)) { 194 evtimer_del(&cs->cs_evt); 195 event_add(&cs->cs_ev, NULL); 196 } 197 198 free(c); 199 } 200 201 static int 202 send_stats(struct imsgev *iev) 203 { 204 struct namespace *ns; 205 const struct btree_stat *st; 206 struct ns_stat nss; 207 208 imsgev_compose(iev, IMSG_CTL_STATS, 0, iev->ibuf.pid, -1, 209 &stats, sizeof(stats)); 210 211 TAILQ_FOREACH(ns, &conf->namespaces, next) { 212 if (namespace_has_referrals(ns)) 213 continue; 214 bzero(&nss, sizeof(nss)); 215 strlcpy(nss.suffix, ns->suffix, sizeof(nss.suffix)); 216 if ((st = btree_stat(ns->data_db)) != NULL) 217 bcopy(st, &nss.data_stat, sizeof(nss.data_stat)); 218 219 if ((st = btree_stat(ns->indx_db)) != NULL) 220 bcopy(st, &nss.indx_stat, sizeof(nss.indx_stat)); 221 222 imsgev_compose(iev, IMSG_CTL_NSSTATS, 0, iev->ibuf.pid, -1, 223 &nss, sizeof(nss)); 224 } 225 226 imsgev_compose(iev, IMSG_CTL_END, 0, iev->ibuf.pid, -1, NULL, 0); 227 228 return 0; 229 } 230 231 static void 232 control_imsgev(struct imsgev *iev, int code, struct imsg *imsg) 233 { 234 struct control_sock *cs; 235 struct ctl_conn *c; 236 int fd, verbose; 237 238 cs = iev->data; 239 fd = iev->ibuf.fd; 240 241 if ((c = control_connbyfd(fd)) == NULL) { 242 log_warnx("%s: fd %d: not found", __func__, fd); 243 return; 244 } 245 246 if (code != IMSGEV_IMSG) { 247 control_close(fd, cs); 248 return; 249 } 250 251 log_debug("%s: got imsg %i on fd %i", __func__, imsg->hdr.type, fd); 252 switch (imsg->hdr.type) { 253 case IMSG_CTL_STATS: 254 if (send_stats(iev) == -1) { 255 log_debug("%s: failed to send statistics", __func__); 256 control_close(fd, cs); 257 } 258 break; 259 case IMSG_CTL_LOG_VERBOSE: 260 if (imsg->hdr.len != IMSG_HEADER_SIZE + sizeof(verbose)) 261 break; 262 263 bcopy(imsg->data, &verbose, sizeof(verbose)); 264 imsgev_compose(iev_ldapd, IMSG_CTL_LOG_VERBOSE, 0, 0, -1, 265 &verbose, sizeof(verbose)); 266 267 log_verbose(verbose); 268 break; 269 default: 270 log_warnx("%s: unexpected imsg %d", __func__, imsg->hdr.type); 271 break; 272 } 273 } 274 275 void 276 control_needfd(struct imsgev *iev) 277 { 278 fatal("should never need an fd for control messages"); 279 } 280 281 int 282 control_close_any(struct control_sock *cs) 283 { 284 struct ctl_conn *c; 285 286 c = TAILQ_FIRST(&ctl_conns); 287 if (c != NULL) { 288 log_warn("closing oldest control connection"); 289 control_close(c->iev.ibuf.fd, cs); 290 return (0); 291 } 292 log_warn("no control connections to close"); 293 return (-1); 294 } 295