2 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 #include <sys/types.h>
21 #include <sys/socket.h>
25 #include <netinet/in.h>
40 #define CONTROL_BACKLOG 5
46 } control_state = {.fd = -1};
49 TAILQ_ENTRY(ctl_conn) entry;
53 TAILQ_HEAD(ctl_conns, ctl_conn) ctl_conns = TAILQ_HEAD_INITIALIZER(ctl_conns);
55 struct ctl_conn *control_connbyfd(int);
56 struct ctl_conn *control_connbypid(pid_t);
57 void control_close(int);
60 control_init(const char *path)
62 struct sockaddr_un sun;
66 if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
68 log_warn("%s: socket", __func__);
72 memset(&sun, 0, sizeof(sun));
73 sun.sun_family = AF_UNIX;
74 strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
76 if (unlink(path) == -1)
77 if (errno != ENOENT) {
78 log_warn("%s: unlink %s", __func__, path);
83 old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
84 if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
85 log_warn("%s: bind: %s", __func__, path);
92 if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
93 log_warn("%s: chmod", __func__);
103 control_listen(int fd)
105 if (control_state.fd != -1)
106 fatalx("%s: received unexpected controlsock", __func__);
108 control_state.fd = fd;
109 if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
110 log_warn("%s: listen", __func__);
114 event_set(&control_state.ev, control_state.fd, EV_READ,
115 control_accept, NULL);
116 event_add(&control_state.ev, NULL);
117 evtimer_set(&control_state.evt, control_accept, NULL);
123 control_accept(int listenfd, short event, void *bula)
127 struct sockaddr_un sun;
130 event_add(&control_state.ev, NULL);
131 if ((event & EV_TIMEOUT))
135 if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
136 SOCK_CLOEXEC | SOCK_NONBLOCK)) == -1) {
138 * Pause accept if we are out of file descriptors, or
139 * libevent will haunt us here too.
141 if (errno == ENFILE || errno == EMFILE) {
142 struct timeval evtpause = { 1, 0 };
144 event_del(&control_state.ev);
145 evtimer_add(&control_state.evt, &evtpause);
146 } else if (errno != EWOULDBLOCK && errno != EINTR &&
147 errno != ECONNABORTED)
148 log_warn("%s: accept4", __func__);
152 if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
153 log_warn("%s: calloc", __func__);
158 imsg_init(&c->iev.ibuf, connfd);
159 c->iev.handler = control_dispatch_imsg;
160 c->iev.events = EV_READ;
161 event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
162 c->iev.handler, &c->iev);
163 event_add(&c->iev.ev, NULL);
165 TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
169 control_connbyfd(int fd)
173 TAILQ_FOREACH(c, &ctl_conns, entry) {
174 if (c->iev.ibuf.fd == fd)
182 control_connbypid(pid_t pid)
186 TAILQ_FOREACH(c, &ctl_conns, entry) {
187 if (c->iev.ibuf.pid == pid)
195 control_close(int fd)
199 if ((c = control_connbyfd(fd)) == NULL) {
200 log_warnx("%s: fd %d: not found", __func__, fd);
204 msgbuf_clear(&c->iev.ibuf.w);
205 TAILQ_REMOVE(&ctl_conns, c, entry);
207 event_del(&c->iev.ev);
208 close(c->iev.ibuf.fd);
210 /* Some file descriptors are available again. */
211 if (evtimer_pending(&control_state.evt, NULL)) {
212 evtimer_del(&control_state.evt);
213 event_add(&control_state.ev, NULL);
220 control_dispatch_imsg(int fd, short event, void *bula)
227 if ((c = control_connbyfd(fd)) == NULL) {
228 log_warnx("%s: fd %d: not found", __func__, fd);
232 if (event & EV_READ) {
233 if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) ||
239 if (event & EV_WRITE) {
240 if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
247 if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
254 switch (imsg.hdr.type) {
255 case IMSG_CTL_RELOAD:
256 listener_imsg_compose_main(imsg.hdr.type, 0, NULL, 0);
258 case IMSG_CTL_LOG_VERBOSE:
259 if (IMSG_DATA_SIZE(imsg) != sizeof(verbose))
262 /* Forward to all other processes. */
263 listener_imsg_compose_main(imsg.hdr.type, imsg.hdr.pid,
264 imsg.data, IMSG_DATA_SIZE(imsg));
266 /* XXX: send to every client? */
268 memcpy(&verbose, imsg.data, sizeof(verbose));
269 log_setverbose(verbose);
272 log_debug("%s: error handling imsg %d", __func__,
279 imsg_event_add(&c->iev);
283 control_imsg_relay(struct imsg *imsg)
287 if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
290 return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
291 -1, imsg->data, IMSG_DATA_SIZE(*imsg)));