1 /* $OpenBSD: control.c,v 1.1 2024/07/09 17:26:14 yasuoka 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/queue.h> 21 #include <sys/socket.h> 22 #include <sys/stat.h> 23 #include <sys/time.h> 24 #include <sys/un.h> 25 26 #include <errno.h> 27 #include <event.h> 28 #include <imsg.h> 29 #include <stdlib.h> 30 #include <stdio.h> 31 #include <string.h> 32 #include <unistd.h> 33 34 #include "radiusd.h" 35 #include "radiusd_local.h" 36 #include "log.h" 37 #include "control.h" 38 39 static TAILQ_HEAD(, ctl_conn) ctl_conns = TAILQ_HEAD_INITIALIZER(ctl_conns); 40 41 #define CONTROL_BACKLOG 5 42 static int idseq = 0; 43 44 struct ctl_conn *control_connbyfd(int); 45 struct ctl_conn *control_connbyid(uint32_t); 46 void control_close(int); 47 void control_connfree(struct ctl_conn *); 48 void control_event_add(struct ctl_conn *); 49 50 struct { 51 struct event ev; 52 struct event evt; 53 int fd; 54 } control_state; 55 56 int 57 control_init(const char *path) 58 { 59 struct sockaddr_un sun; 60 int fd; 61 mode_t old_umask; 62 63 if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 64 0)) == -1) { 65 log_warn("control_init: socket"); 66 return (-1); 67 } 68 69 memset(&sun, 0, sizeof(sun)); 70 sun.sun_family = AF_UNIX; 71 strlcpy(sun.sun_path, path, sizeof(sun.sun_path)); 72 73 if (unlink(path) == -1) 74 if (errno != ENOENT) { 75 log_warn("control_init: unlink %s", path); 76 close(fd); 77 return (-1); 78 } 79 80 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH); 81 if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) { 82 log_warn("control_init: bind: %s", path); 83 close(fd); 84 umask(old_umask); 85 return (-1); 86 } 87 umask(old_umask); 88 89 if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) { 90 log_warn("control_init: chmod"); 91 close(fd); 92 (void)unlink(path); 93 return (-1); 94 } 95 96 control_state.fd = fd; 97 98 return (0); 99 } 100 101 int 102 control_listen(void) 103 { 104 105 if (listen(control_state.fd, CONTROL_BACKLOG) == -1) { 106 log_warn("control_listen: listen"); 107 return (-1); 108 } 109 110 event_set(&control_state.ev, control_state.fd, EV_READ, 111 control_accept, NULL); 112 event_add(&control_state.ev, NULL); 113 evtimer_set(&control_state.evt, control_accept, NULL); 114 115 return (0); 116 } 117 118 void 119 control_cleanup(void) 120 { 121 struct ctl_conn *c, *t; 122 123 TAILQ_FOREACH_SAFE(c, &ctl_conns, entry, t) { 124 TAILQ_REMOVE(&ctl_conns, c, entry); 125 control_connfree(c); 126 } 127 event_del(&control_state.ev); 128 event_del(&control_state.evt); 129 } 130 131 /* ARGSUSED */ 132 void 133 control_accept(int listenfd, short event, void *bula) 134 { 135 int connfd; 136 socklen_t len; 137 struct sockaddr_un sun; 138 struct ctl_conn *c; 139 140 event_add(&control_state.ev, NULL); 141 if ((event & EV_TIMEOUT)) 142 return; 143 144 len = sizeof(sun); 145 if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len, 146 SOCK_CLOEXEC | SOCK_NONBLOCK)) == -1) { 147 /* 148 * Pause accept if we are out of file descriptors, or 149 * libevent will haunt us here too. 150 */ 151 if (errno == ENFILE || errno == EMFILE) { 152 struct timeval evtpause = { 1, 0 }; 153 154 event_del(&control_state.ev); 155 evtimer_add(&control_state.evt, &evtpause); 156 } else if (errno != EWOULDBLOCK && errno != EINTR && 157 errno != ECONNABORTED) 158 log_warn("control_accept: accept"); 159 return; 160 } 161 162 if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) { 163 log_warn("control_accept"); 164 close(connfd); 165 return; 166 } 167 168 if (idseq == 0) /* don't use zero. See radiusd_module_imsg */ 169 ++idseq; 170 c->id = idseq++; 171 imsg_init(&c->iev.ibuf, connfd); 172 c->iev.handler = control_dispatch_imsg; 173 c->iev.events = EV_READ; 174 event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events, c->iev.handler, c); 175 event_add(&c->iev.ev, NULL); 176 177 TAILQ_INSERT_TAIL(&ctl_conns, c, entry); 178 } 179 180 struct ctl_conn * 181 control_connbyfd(int fd) 182 { 183 struct ctl_conn *c; 184 185 TAILQ_FOREACH(c, &ctl_conns, entry) { 186 if (c->iev.ibuf.fd == fd) 187 break; 188 } 189 190 return (c); 191 } 192 193 struct ctl_conn * 194 control_connbyid(uint32_t id) 195 { 196 struct ctl_conn *c; 197 198 TAILQ_FOREACH(c, &ctl_conns, entry) { 199 if (c->id == id) 200 break; 201 } 202 203 return (c); 204 } 205 206 void 207 control_close(int fd) 208 { 209 struct ctl_conn *c; 210 211 if ((c = control_connbyfd(fd)) == NULL) { 212 log_warn("control_close: fd %d: not found", fd); 213 return; 214 } 215 if (c->modulename[0] != '\0') 216 radiusd_imsg_compose_module(radiusd_s, c->modulename, 217 IMSG_RADIUSD_MODULE_CTRL_UNBIND, c->id, -1, -1, NULL, 0); 218 219 control_connfree(c); 220 } 221 222 void 223 control_connfree(struct ctl_conn *c) 224 { 225 msgbuf_clear(&c->iev.ibuf.w); 226 TAILQ_REMOVE(&ctl_conns, c, entry); 227 228 event_del(&c->iev.ev); 229 close(c->iev.ibuf.fd); 230 231 /* Some file descriptors are available again. */ 232 if (evtimer_pending(&control_state.evt, NULL)) { 233 evtimer_del(&control_state.evt); 234 event_add(&control_state.ev, NULL); 235 } 236 237 free(c); 238 } 239 240 /* ARGSUSED */ 241 void 242 control_dispatch_imsg(int fd, short event, void *bula) 243 { 244 struct ctl_conn *c; 245 struct imsg imsg; 246 ssize_t n, datalen; 247 char modulename[RADIUSD_MODULE_NAME_LEN + 1], msg[128]; 248 249 if ((c = control_connbyfd(fd)) == NULL) { 250 log_warn("control_dispatch_imsg: fd %d: not found", fd); 251 return; 252 } 253 254 if (event & EV_READ) { 255 if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) || 256 n == 0) { 257 control_close(fd); 258 return; 259 } 260 } 261 if (event & EV_WRITE) { 262 if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) { 263 control_close(fd); 264 return; 265 } 266 } 267 268 for (;;) { 269 if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) { 270 control_close(fd); 271 return; 272 } 273 274 if (n == 0) 275 break; 276 277 datalen = imsg.hdr.len - IMSG_HEADER_SIZE; 278 switch (imsg.hdr.type) { 279 default: 280 if (imsg.hdr.type >= IMSG_RADIUSD_MODULE_MIN) { 281 if (datalen < RADIUSD_MODULE_NAME_LEN) { 282 log_warnx( "%s: received an invalid " 283 "imsg %d: too small", __func__, 284 imsg.hdr.type); 285 break; 286 } 287 memset(modulename, 0, sizeof(modulename)); 288 memcpy(modulename, imsg.data, 289 RADIUSD_MODULE_NAME_LEN); 290 if (radiusd_imsg_compose_module(radiusd_s, 291 modulename, imsg.hdr.type, c->id, -1, -1, 292 (caddr_t)imsg.data + 293 RADIUSD_MODULE_NAME_LEN, datalen - 294 RADIUSD_MODULE_NAME_LEN) != 0) { 295 snprintf(msg, sizeof(msg), 296 "module `%s' is not loaded or not " 297 "capable for control command", 298 modulename); 299 imsg_compose_event(&c->iev, 300 IMSG_NG, c->id, -1, -1, msg, 301 strlen(msg) + 1); 302 } 303 } else 304 log_debug("control_dispatch_imsg: " 305 "error handling imsg %d", imsg.hdr.type); 306 break; 307 } 308 imsg_free(&imsg); 309 } 310 imsg_event_add(&c->iev); 311 } 312 313 int 314 control_imsg_relay(struct imsg *imsg) 315 { 316 struct ctl_conn *c; 317 318 if ((c = control_connbyid(imsg->hdr.peerid)) == NULL) 319 return (0); 320 321 return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid, 322 -1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE)); 323 } 324 325 void 326 control_conn_bind(uint32_t peerid, const char *modulename) 327 { 328 struct ctl_conn *c; 329 330 if ((c = control_connbyid(peerid)) == NULL) 331 return; 332 333 if (c->modulename[0] != '\0') 334 radiusd_imsg_compose_module(radiusd_s, c->modulename, 335 IMSG_RADIUSD_MODULE_CTRL_UNBIND, c->id, -1, -1, NULL, 0); 336 strlcpy(c->modulename, modulename, sizeof(c->modulename)); 337 } 338