1 /* $OpenBSD: control.c,v 1.13 2016/01/17 08:13:34 landry 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/types.h> 22 #include <sys/stat.h> 23 #include <sys/socket.h> 24 #include <sys/un.h> 25 #include <sys/tree.h> 26 27 #include <net/if.h> 28 29 #include <errno.h> 30 #include <event.h> 31 #include <fcntl.h> 32 #include <signal.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <unistd.h> 36 37 #include "ldapd.h" 38 39 #define CONTROL_BACKLOG 5 40 41 struct ctl_connlist ctl_conns; 42 43 struct ctl_conn *control_connbyfd(int); 44 void control_close(int, struct control_sock *); 45 static void control_imsgev(struct imsgev *iev, int code, struct imsg *imsg); 46 static void control_needfd(struct imsgev *iev); 47 48 void 49 control_init(struct control_sock *cs) 50 { 51 struct sockaddr_un sun; 52 int fd; 53 mode_t old_umask, mode; 54 55 if (cs->cs_name == NULL) 56 return; 57 58 if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0)) == -1) 59 fatal("control_init: socket"); 60 61 memset(&sun, 0, sizeof(sun)); 62 sun.sun_family = AF_UNIX; 63 if (strlcpy(sun.sun_path, cs->cs_name, 64 sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) 65 fatalx("control_init: name too long"); 66 67 if (connect(fd, (struct sockaddr *)&sun, sizeof(sun)) == 0) 68 fatalx("control socket already listening"); 69 70 if (unlink(cs->cs_name) == -1 && errno != ENOENT) 71 fatal("control_init: unlink"); 72 73 if (cs->cs_restricted) { 74 old_umask = umask(S_IXUSR|S_IXGRP|S_IXOTH); 75 mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH; 76 } else { 77 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH); 78 mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP; 79 } 80 81 if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) { 82 (void)umask(old_umask); 83 fatal("control_init: bind"); 84 } 85 (void)umask(old_umask); 86 87 if (chmod(cs->cs_name, mode) == -1) { 88 (void)unlink(cs->cs_name); 89 fatal("control_init: chmod"); 90 } 91 92 cs->cs_fd = fd; 93 } 94 95 void 96 control_listen(struct control_sock *cs) 97 { 98 if (cs->cs_name == NULL) 99 return; 100 101 if (listen(cs->cs_fd, CONTROL_BACKLOG) == -1) 102 fatal("control_listen: listen"); 103 104 event_set(&cs->cs_ev, cs->cs_fd, EV_READ, 105 control_accept, cs); 106 event_add(&cs->cs_ev, NULL); 107 evtimer_set(&cs->cs_evt, control_accept, cs); 108 } 109 110 void 111 control_cleanup(struct control_sock *cs) 112 { 113 if (cs->cs_name == NULL) 114 return; 115 event_del(&cs->cs_ev); 116 event_del(&cs->cs_evt); 117 } 118 119 /* ARGSUSED */ 120 void 121 control_accept(int listenfd, short event, void *arg) 122 { 123 struct control_sock *cs = arg; 124 int connfd; 125 socklen_t len; 126 struct sockaddr_un sun; 127 struct ctl_conn *c; 128 129 event_add(&cs->cs_ev, NULL); 130 if ((event & EV_TIMEOUT)) 131 return; 132 133 len = sizeof(sun); 134 if ((connfd = accept_reserve(listenfd, 135 (struct sockaddr *)&sun, &len, FD_RESERVE)) == -1) { 136 /* 137 * Pause accept if we are out of file descriptors, or 138 * libevent will haunt us here too. 139 */ 140 if (errno == ENFILE || errno == EMFILE) { 141 struct timeval evtpause = { 1, 0 }; 142 143 event_del(&cs->cs_ev); 144 evtimer_add(&cs->cs_evt, &evtpause); 145 } else if (errno != EWOULDBLOCK && errno != EINTR) 146 log_warn("control_accept"); 147 return; 148 } 149 150 if ((c = calloc(1, sizeof(*c))) == NULL) { 151 log_warn("control_accept"); 152 close(connfd); 153 return; 154 } 155 156 log_debug("accepted control fd %d", connfd); 157 TAILQ_INSERT_TAIL(&ctl_conns, c, entry); 158 imsgev_init(&c->iev, connfd, cs, control_imsgev, control_needfd); 159 } 160 161 struct ctl_conn * 162 control_connbyfd(int fd) 163 { 164 struct ctl_conn *c; 165 166 for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.fd != fd; 167 c = TAILQ_NEXT(c, entry)) 168 ; /* nothing */ 169 170 return (c); 171 } 172 173 void 174 control_close(int fd, struct control_sock *cs) 175 { 176 struct ctl_conn *c; 177 178 if ((c = control_connbyfd(fd)) == NULL) { 179 log_warnx("control_close: fd %d: not found", fd); 180 return; 181 } 182 183 log_debug("close control fd %d", c->iev.ibuf.fd); 184 TAILQ_REMOVE(&ctl_conns, c, entry); 185 imsgev_clear(&c->iev); 186 187 /* Some file descriptors are available again. */ 188 if (evtimer_pending(&cs->cs_evt, NULL)) { 189 evtimer_del(&cs->cs_evt); 190 event_add(&cs->cs_ev, NULL); 191 } 192 193 free(c); 194 } 195 196 static int 197 send_stats(struct imsgev *iev) 198 { 199 struct namespace *ns; 200 const struct btree_stat *st; 201 struct ns_stat nss; 202 203 imsgev_compose(iev, IMSG_CTL_STATS, 0, iev->ibuf.pid, -1, 204 &stats, sizeof(stats)); 205 206 TAILQ_FOREACH(ns, &conf->namespaces, next) { 207 if (namespace_has_referrals(ns)) 208 continue; 209 memset(&nss, 0, sizeof(nss)); 210 strlcpy(nss.suffix, ns->suffix, sizeof(nss.suffix)); 211 if ((st = btree_stat(ns->data_db)) != NULL) 212 bcopy(st, &nss.data_stat, sizeof(nss.data_stat)); 213 214 if ((st = btree_stat(ns->indx_db)) != NULL) 215 bcopy(st, &nss.indx_stat, sizeof(nss.indx_stat)); 216 217 imsgev_compose(iev, IMSG_CTL_NSSTATS, 0, iev->ibuf.pid, -1, 218 &nss, sizeof(nss)); 219 } 220 221 imsgev_compose(iev, IMSG_CTL_END, 0, iev->ibuf.pid, -1, NULL, 0); 222 223 return 0; 224 } 225 226 static void 227 control_imsgev(struct imsgev *iev, int code, struct imsg *imsg) 228 { 229 struct control_sock *cs; 230 struct ctl_conn *c; 231 int fd, verbose; 232 233 cs = iev->data; 234 fd = iev->ibuf.fd; 235 236 if ((c = control_connbyfd(fd)) == NULL) { 237 log_warnx("%s: fd %d: not found", __func__, fd); 238 return; 239 } 240 241 if (code != IMSGEV_IMSG) { 242 control_close(fd, cs); 243 return; 244 } 245 246 log_debug("%s: got imsg %d on fd %d", __func__, imsg->hdr.type, fd); 247 switch (imsg->hdr.type) { 248 case IMSG_CTL_STATS: 249 if (send_stats(iev) == -1) { 250 log_debug("%s: failed to send statistics", __func__); 251 control_close(fd, cs); 252 } 253 break; 254 case IMSG_CTL_LOG_VERBOSE: 255 if (imsg->hdr.len != IMSG_HEADER_SIZE + sizeof(verbose)) 256 break; 257 258 bcopy(imsg->data, &verbose, sizeof(verbose)); 259 imsgev_compose(iev_ldapd, IMSG_CTL_LOG_VERBOSE, 0, 0, -1, 260 &verbose, sizeof(verbose)); 261 262 log_verbose(verbose); 263 break; 264 default: 265 log_warnx("%s: unexpected imsg %d", __func__, imsg->hdr.type); 266 break; 267 } 268 } 269 270 void 271 control_needfd(struct imsgev *iev) 272 { 273 fatal("should never need an fd for control messages"); 274 } 275 276 int 277 control_close_any(struct control_sock *cs) 278 { 279 struct ctl_conn *c; 280 281 c = TAILQ_FIRST(&ctl_conns); 282 if (c != NULL) { 283 log_warn("closing oldest control connection"); 284 control_close(c->iev.ibuf.fd, cs); 285 return (0); 286 } 287 log_warn("no control connections to close"); 288 return (-1); 289 } 290