2 8d1b399b 2021-07-22 op * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
4 8d1b399b 2021-07-22 op * Permission to use, copy, modify, and distribute this software for any
5 8d1b399b 2021-07-22 op * purpose with or without fee is hereby granted, provided that the above
6 8d1b399b 2021-07-22 op * copyright notice and this permission notice appear in all copies.
8 8d1b399b 2021-07-22 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 8d1b399b 2021-07-22 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 8d1b399b 2021-07-22 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 8d1b399b 2021-07-22 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 8d1b399b 2021-07-22 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 8d1b399b 2021-07-22 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 8d1b399b 2021-07-22 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 dc25b034 2021-07-22 op #include "compat.h"
19 8d1b399b 2021-07-22 op #include <sys/types.h>
20 8d1b399b 2021-07-22 op #include <sys/stat.h>
21 8d1b399b 2021-07-22 op #include <sys/socket.h>
22 8d1b399b 2021-07-22 op #include <sys/uio.h>
23 8d1b399b 2021-07-22 op #include <sys/un.h>
25 8d1b399b 2021-07-22 op #include <netinet/in.h>
26 8d1b399b 2021-07-22 op #include <net/if.h>
28 8d1b399b 2021-07-22 op #include <errno.h>
29 8d1b399b 2021-07-22 op #include <stdlib.h>
30 8d1b399b 2021-07-22 op #include <string.h>
31 8d1b399b 2021-07-22 op #include <unistd.h>
33 8d1b399b 2021-07-22 op #include "control.h"
34 9820edbf 2021-08-06 op #include "kamid.h"
35 8d1b399b 2021-07-22 op #include "listener.h"
36 9820edbf 2021-08-06 op #include "log.h"
37 9820edbf 2021-08-06 op #include "utils.h"
39 8d1b399b 2021-07-22 op #define CONTROL_BACKLOG 5
42 8d1b399b 2021-07-22 op struct event ev;
43 8d1b399b 2021-07-22 op struct event evt;
45 8d1b399b 2021-07-22 op } control_state = {.fd = -1};
47 8d1b399b 2021-07-22 op struct ctl_conn {
48 8d1b399b 2021-07-22 op TAILQ_ENTRY(ctl_conn) entry;
49 8d1b399b 2021-07-22 op struct imsgev iev;
52 8d1b399b 2021-07-22 op TAILQ_HEAD(ctl_conns, ctl_conn) ctl_conns = TAILQ_HEAD_INITIALIZER(ctl_conns);
54 8d1b399b 2021-07-22 op struct ctl_conn *control_connbyfd(int);
55 8d1b399b 2021-07-22 op struct ctl_conn *control_connbypid(pid_t);
56 8d1b399b 2021-07-22 op void control_close(int);
59 8d1b399b 2021-07-22 op control_init(const char *path)
61 8d1b399b 2021-07-22 op struct sockaddr_un sun;
63 8d1b399b 2021-07-22 op mode_t old_umask;
65 8d1b399b 2021-07-22 op if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
67 8d1b399b 2021-07-22 op log_warn("%s: socket", __func__);
71 8d1b399b 2021-07-22 op memset(&sun, 0, sizeof(sun));
72 8d1b399b 2021-07-22 op sun.sun_family = AF_UNIX;
73 8d1b399b 2021-07-22 op strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
75 8d1b399b 2021-07-22 op if (unlink(path) == -1)
76 8d1b399b 2021-07-22 op if (errno != ENOENT) {
77 8d1b399b 2021-07-22 op log_warn("%s: unlink %s", __func__, path);
82 8d1b399b 2021-07-22 op old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
83 8d1b399b 2021-07-22 op if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
84 8d1b399b 2021-07-22 op log_warn("%s: bind: %s", __func__, path);
86 8d1b399b 2021-07-22 op umask(old_umask);
89 8d1b399b 2021-07-22 op umask(old_umask);
91 8d1b399b 2021-07-22 op if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
92 8d1b399b 2021-07-22 op log_warn("%s: chmod", __func__);
94 8d1b399b 2021-07-22 op (void)unlink(path);
102 8d1b399b 2021-07-22 op control_listen(int fd)
104 8d1b399b 2021-07-22 op if (control_state.fd != -1)
105 8d1b399b 2021-07-22 op fatalx("%s: received unexpected controlsock", __func__);
107 8d1b399b 2021-07-22 op control_state.fd = fd;
108 8d1b399b 2021-07-22 op if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
109 8d1b399b 2021-07-22 op log_warn("%s: listen", __func__);
113 8d1b399b 2021-07-22 op event_set(&control_state.ev, control_state.fd, EV_READ,
114 8d1b399b 2021-07-22 op control_accept, NULL);
115 8d1b399b 2021-07-22 op event_add(&control_state.ev, NULL);
116 8d1b399b 2021-07-22 op evtimer_set(&control_state.evt, control_accept, NULL);
122 8d1b399b 2021-07-22 op control_accept(int listenfd, short event, void *bula)
125 8d1b399b 2021-07-22 op socklen_t len;
126 8d1b399b 2021-07-22 op struct sockaddr_un sun;
127 8d1b399b 2021-07-22 op struct ctl_conn *c;
129 8d1b399b 2021-07-22 op event_add(&control_state.ev, NULL);
130 8d1b399b 2021-07-22 op if ((event & EV_TIMEOUT))
133 8d1b399b 2021-07-22 op len = sizeof(sun);
134 8d1b399b 2021-07-22 op if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
135 8d1b399b 2021-07-22 op SOCK_CLOEXEC | SOCK_NONBLOCK)) == -1) {
137 8d1b399b 2021-07-22 op * Pause accept if we are out of file descriptors, or
138 8d1b399b 2021-07-22 op * libevent will haunt us here too.
140 8d1b399b 2021-07-22 op if (errno == ENFILE || errno == EMFILE) {
141 8d1b399b 2021-07-22 op struct timeval evtpause = { 1, 0 };
143 8d1b399b 2021-07-22 op event_del(&control_state.ev);
144 8d1b399b 2021-07-22 op evtimer_add(&control_state.evt, &evtpause);
145 8d1b399b 2021-07-22 op } else if (errno != EWOULDBLOCK && errno != EINTR &&
146 8d1b399b 2021-07-22 op errno != ECONNABORTED)
147 8d1b399b 2021-07-22 op log_warn("%s: accept4", __func__);
151 8d1b399b 2021-07-22 op if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
152 8d1b399b 2021-07-22 op log_warn("%s: calloc", __func__);
153 8d1b399b 2021-07-22 op close(connfd);
157 8d1b399b 2021-07-22 op imsg_init(&c->iev.ibuf, connfd);
158 8d1b399b 2021-07-22 op c->iev.handler = control_dispatch_imsg;
159 8d1b399b 2021-07-22 op c->iev.events = EV_READ;
160 8d1b399b 2021-07-22 op event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
161 8d1b399b 2021-07-22 op c->iev.handler, &c->iev);
162 8d1b399b 2021-07-22 op event_add(&c->iev.ev, NULL);
164 8d1b399b 2021-07-22 op TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
167 8d1b399b 2021-07-22 op struct ctl_conn *
168 8d1b399b 2021-07-22 op control_connbyfd(int fd)
170 8d1b399b 2021-07-22 op struct ctl_conn *c;
172 8d1b399b 2021-07-22 op TAILQ_FOREACH(c, &ctl_conns, entry) {
173 8d1b399b 2021-07-22 op if (c->iev.ibuf.fd == fd)
180 8d1b399b 2021-07-22 op struct ctl_conn *
181 8d1b399b 2021-07-22 op control_connbypid(pid_t pid)
183 8d1b399b 2021-07-22 op struct ctl_conn *c;
185 8d1b399b 2021-07-22 op TAILQ_FOREACH(c, &ctl_conns, entry) {
186 8d1b399b 2021-07-22 op if (c->iev.ibuf.pid == pid)
194 8d1b399b 2021-07-22 op control_close(int fd)
196 8d1b399b 2021-07-22 op struct ctl_conn *c;
198 8d1b399b 2021-07-22 op if ((c = control_connbyfd(fd)) == NULL) {
199 8d1b399b 2021-07-22 op log_warnx("%s: fd %d: not found", __func__, fd);
203 8d1b399b 2021-07-22 op msgbuf_clear(&c->iev.ibuf.w);
204 8d1b399b 2021-07-22 op TAILQ_REMOVE(&ctl_conns, c, entry);
206 8d1b399b 2021-07-22 op event_del(&c->iev.ev);
207 8d1b399b 2021-07-22 op close(c->iev.ibuf.fd);
209 8d1b399b 2021-07-22 op /* Some file descriptors are available again. */
210 8d1b399b 2021-07-22 op if (evtimer_pending(&control_state.evt, NULL)) {
211 8d1b399b 2021-07-22 op evtimer_del(&control_state.evt);
212 8d1b399b 2021-07-22 op event_add(&control_state.ev, NULL);
219 8d1b399b 2021-07-22 op control_dispatch_imsg(int fd, short event, void *bula)
221 8d1b399b 2021-07-22 op struct ctl_conn *c;
222 8d1b399b 2021-07-22 op struct imsg imsg;
226 8d1b399b 2021-07-22 op if ((c = control_connbyfd(fd)) == NULL) {
227 8d1b399b 2021-07-22 op log_warnx("%s: fd %d: not found", __func__, fd);
231 8d1b399b 2021-07-22 op if (event & EV_READ) {
232 8d1b399b 2021-07-22 op if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) ||
234 8d1b399b 2021-07-22 op control_close(fd);
238 8d1b399b 2021-07-22 op if (event & EV_WRITE) {
239 8d1b399b 2021-07-22 op if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
240 8d1b399b 2021-07-22 op control_close(fd);
246 8d1b399b 2021-07-22 op if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
247 8d1b399b 2021-07-22 op control_close(fd);
253 8d1b399b 2021-07-22 op switch (imsg.hdr.type) {
254 8d1b399b 2021-07-22 op case IMSG_CTL_RELOAD:
255 8d1b399b 2021-07-22 op listener_imsg_compose_main(imsg.hdr.type, 0, NULL, 0);
257 8d1b399b 2021-07-22 op case IMSG_CTL_LOG_VERBOSE:
258 8d1b399b 2021-07-22 op if (IMSG_DATA_SIZE(imsg) != sizeof(verbose))
261 8d1b399b 2021-07-22 op /* Forward to all other processes. */
262 8d1b399b 2021-07-22 op listener_imsg_compose_main(imsg.hdr.type, imsg.hdr.pid,
263 8d1b399b 2021-07-22 op imsg.data, IMSG_DATA_SIZE(imsg));
265 8d1b399b 2021-07-22 op /* XXX: send to every client? */
267 8d1b399b 2021-07-22 op memcpy(&verbose, imsg.data, sizeof(verbose));
268 8d1b399b 2021-07-22 op log_setverbose(verbose);
271 8d1b399b 2021-07-22 op log_debug("%s: error handling imsg %d", __func__,
272 8d1b399b 2021-07-22 op imsg.hdr.type);
275 8d1b399b 2021-07-22 op imsg_free(&imsg);
278 8d1b399b 2021-07-22 op imsg_event_add(&c->iev);
282 8d1b399b 2021-07-22 op control_imsg_relay(struct imsg *imsg)
284 8d1b399b 2021-07-22 op struct ctl_conn *c;
286 8d1b399b 2021-07-22 op if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
289 8d1b399b 2021-07-22 op return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
290 8d1b399b 2021-07-22 op -1, imsg->data, IMSG_DATA_SIZE(*imsg)));