1 /* $OpenBSD: control.c,v 1.18 2023/03/08 04:43:13 guenther 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 #include "log.h" 39 40 #define CONTROL_BACKLOG 5 41 42 struct ctl_connlist ctl_conns = TAILQ_HEAD_INITIALIZER(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 | SOCK_NONBLOCK, 0)) == -1) 60 fatal("control_init: socket"); 61 62 memset(&sun, 0, 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 cs->cs_fd = fd; 94 } 95 96 void 97 control_listen(struct control_sock *cs) 98 { 99 if (cs->cs_name == NULL) 100 return; 101 102 if (listen(cs->cs_fd, CONTROL_BACKLOG) == -1) 103 fatal("control_listen: listen"); 104 105 event_set(&cs->cs_ev, cs->cs_fd, EV_READ, 106 control_accept, cs); 107 event_add(&cs->cs_ev, NULL); 108 evtimer_set(&cs->cs_evt, control_accept, cs); 109 } 110 111 void 112 control_cleanup(struct control_sock *cs) 113 { 114 if (cs->cs_name == NULL) 115 return; 116 event_del(&cs->cs_ev); 117 event_del(&cs->cs_evt); 118 } 119 120 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 TAILQ_FOREACH(c, &ctl_conns, entry) { 167 if (c->iev.ibuf.fd == fd) 168 break; 169 } 170 171 return (c); 172 } 173 174 void 175 control_close(int fd, struct control_sock *cs) 176 { 177 struct ctl_conn *c; 178 179 if ((c = control_connbyfd(fd)) == NULL) { 180 log_warnx("control_close: fd %d: not found", fd); 181 return; 182 } 183 184 log_debug("close control fd %d", c->iev.ibuf.fd); 185 TAILQ_REMOVE(&ctl_conns, c, entry); 186 imsgev_clear(&c->iev); 187 188 /* Some file descriptors are available again. */ 189 if (evtimer_pending(&cs->cs_evt, NULL)) { 190 evtimer_del(&cs->cs_evt); 191 event_add(&cs->cs_ev, NULL); 192 } 193 194 free(c); 195 } 196 197 static int 198 send_stats(struct imsgev *iev) 199 { 200 struct namespace *ns; 201 const struct btree_stat *st; 202 struct ns_stat nss; 203 204 imsgev_compose(iev, IMSG_CTL_STATS, 0, iev->ibuf.pid, -1, 205 &stats, sizeof(stats)); 206 207 TAILQ_FOREACH(ns, &conf->namespaces, next) { 208 if (namespace_has_referrals(ns)) 209 continue; 210 memset(&nss, 0, sizeof(nss)); 211 strlcpy(nss.suffix, ns->suffix, sizeof(nss.suffix)); 212 if ((st = btree_stat(ns->data_db)) != NULL) 213 bcopy(st, &nss.data_stat, sizeof(nss.data_stat)); 214 215 if ((st = btree_stat(ns->indx_db)) != NULL) 216 bcopy(st, &nss.indx_stat, sizeof(nss.indx_stat)); 217 218 imsgev_compose(iev, IMSG_CTL_NSSTATS, 0, iev->ibuf.pid, -1, 219 &nss, sizeof(nss)); 220 } 221 222 imsgev_compose(iev, IMSG_CTL_END, 0, iev->ibuf.pid, -1, NULL, 0); 223 224 return 0; 225 } 226 227 static void 228 control_imsgev(struct imsgev *iev, int code, struct imsg *imsg) 229 { 230 struct control_sock *cs; 231 struct ctl_conn *c; 232 int fd, verbose; 233 234 cs = iev->data; 235 fd = iev->ibuf.fd; 236 237 if ((c = control_connbyfd(fd)) == NULL) { 238 log_warnx("%s: fd %d: not found", __func__, fd); 239 return; 240 } 241 242 if (code != IMSGEV_IMSG) { 243 control_close(fd, cs); 244 return; 245 } 246 247 log_debug("%s: got imsg %d on fd %d", __func__, imsg->hdr.type, fd); 248 switch (imsg->hdr.type) { 249 case IMSG_CTL_STATS: 250 if (send_stats(iev) == -1) { 251 log_debug("%s: failed to send statistics", __func__); 252 control_close(fd, cs); 253 } 254 break; 255 case IMSG_CTL_LOG_VERBOSE: 256 if (imsg->hdr.len != IMSG_HEADER_SIZE + sizeof(verbose)) 257 break; 258 259 bcopy(imsg->data, &verbose, sizeof(verbose)); 260 imsgev_compose(iev_ldapd, IMSG_CTL_LOG_VERBOSE, 0, 0, -1, 261 &verbose, sizeof(verbose)); 262 263 log_setverbose(verbose); 264 break; 265 default: 266 log_warnx("%s: unexpected imsg %d", __func__, imsg->hdr.type); 267 break; 268 } 269 } 270 271 void 272 control_needfd(struct imsgev *iev) 273 { 274 fatal("should never need an fd for control messages"); 275 } 276 277 int 278 control_close_any(struct control_sock *cs) 279 { 280 struct ctl_conn *c; 281 282 c = TAILQ_FIRST(&ctl_conns); 283 if (c != NULL) { 284 log_warn("closing oldest control connection"); 285 control_close(c->iev.ibuf.fd, cs); 286 return (0); 287 } 288 log_warn("no control connections to close"); 289 return (-1); 290 } 291