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 "log.h"
34 8d1b399b 2021-07-22 op #include "kamid.h"
35 8d1b399b 2021-07-22 op #include "control.h"
36 8d1b399b 2021-07-22 op #include "listener.h"
38 8d1b399b 2021-07-22 op #define CONTROL_BACKLOG 5
41 8d1b399b 2021-07-22 op struct event ev;
42 8d1b399b 2021-07-22 op struct event evt;
44 8d1b399b 2021-07-22 op } control_state = {.fd = -1};
46 8d1b399b 2021-07-22 op struct ctl_conn {
47 8d1b399b 2021-07-22 op TAILQ_ENTRY(ctl_conn) entry;
48 8d1b399b 2021-07-22 op struct imsgev iev;
51 8d1b399b 2021-07-22 op TAILQ_HEAD(ctl_conns, ctl_conn) ctl_conns = TAILQ_HEAD_INITIALIZER(ctl_conns);
53 8d1b399b 2021-07-22 op struct ctl_conn *control_connbyfd(int);
54 8d1b399b 2021-07-22 op struct ctl_conn *control_connbypid(pid_t);
55 8d1b399b 2021-07-22 op void control_close(int);
58 8d1b399b 2021-07-22 op control_init(const char *path)
60 8d1b399b 2021-07-22 op struct sockaddr_un sun;
62 8d1b399b 2021-07-22 op mode_t old_umask;
64 8d1b399b 2021-07-22 op if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
66 8d1b399b 2021-07-22 op log_warn("%s: socket", __func__);
70 8d1b399b 2021-07-22 op memset(&sun, 0, sizeof(sun));
71 8d1b399b 2021-07-22 op sun.sun_family = AF_UNIX;
72 8d1b399b 2021-07-22 op strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
74 8d1b399b 2021-07-22 op if (unlink(path) == -1)
75 8d1b399b 2021-07-22 op if (errno != ENOENT) {
76 8d1b399b 2021-07-22 op log_warn("%s: unlink %s", __func__, path);
81 8d1b399b 2021-07-22 op old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
82 8d1b399b 2021-07-22 op if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
83 8d1b399b 2021-07-22 op log_warn("%s: bind: %s", __func__, path);
85 8d1b399b 2021-07-22 op umask(old_umask);
88 8d1b399b 2021-07-22 op umask(old_umask);
90 8d1b399b 2021-07-22 op if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
91 8d1b399b 2021-07-22 op log_warn("%s: chmod", __func__);
93 8d1b399b 2021-07-22 op (void)unlink(path);
101 8d1b399b 2021-07-22 op control_listen(int fd)
103 8d1b399b 2021-07-22 op if (control_state.fd != -1)
104 8d1b399b 2021-07-22 op fatalx("%s: received unexpected controlsock", __func__);
106 8d1b399b 2021-07-22 op control_state.fd = fd;
107 8d1b399b 2021-07-22 op if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
108 8d1b399b 2021-07-22 op log_warn("%s: listen", __func__);
112 8d1b399b 2021-07-22 op event_set(&control_state.ev, control_state.fd, EV_READ,
113 8d1b399b 2021-07-22 op control_accept, NULL);
114 8d1b399b 2021-07-22 op event_add(&control_state.ev, NULL);
115 8d1b399b 2021-07-22 op evtimer_set(&control_state.evt, control_accept, NULL);
121 8d1b399b 2021-07-22 op control_accept(int listenfd, short event, void *bula)
124 8d1b399b 2021-07-22 op socklen_t len;
125 8d1b399b 2021-07-22 op struct sockaddr_un sun;
126 8d1b399b 2021-07-22 op struct ctl_conn *c;
128 8d1b399b 2021-07-22 op event_add(&control_state.ev, NULL);
129 8d1b399b 2021-07-22 op if ((event & EV_TIMEOUT))
132 8d1b399b 2021-07-22 op len = sizeof(sun);
133 8d1b399b 2021-07-22 op if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
134 8d1b399b 2021-07-22 op SOCK_CLOEXEC | SOCK_NONBLOCK)) == -1) {
136 8d1b399b 2021-07-22 op * Pause accept if we are out of file descriptors, or
137 8d1b399b 2021-07-22 op * libevent will haunt us here too.
139 8d1b399b 2021-07-22 op if (errno == ENFILE || errno == EMFILE) {
140 8d1b399b 2021-07-22 op struct timeval evtpause = { 1, 0 };
142 8d1b399b 2021-07-22 op event_del(&control_state.ev);
143 8d1b399b 2021-07-22 op evtimer_add(&control_state.evt, &evtpause);
144 8d1b399b 2021-07-22 op } else if (errno != EWOULDBLOCK && errno != EINTR &&
145 8d1b399b 2021-07-22 op errno != ECONNABORTED)
146 8d1b399b 2021-07-22 op log_warn("%s: accept4", __func__);
150 8d1b399b 2021-07-22 op if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
151 8d1b399b 2021-07-22 op log_warn("%s: calloc", __func__);
152 8d1b399b 2021-07-22 op close(connfd);
156 8d1b399b 2021-07-22 op imsg_init(&c->iev.ibuf, connfd);
157 8d1b399b 2021-07-22 op c->iev.handler = control_dispatch_imsg;
158 8d1b399b 2021-07-22 op c->iev.events = EV_READ;
159 8d1b399b 2021-07-22 op event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
160 8d1b399b 2021-07-22 op c->iev.handler, &c->iev);
161 8d1b399b 2021-07-22 op event_add(&c->iev.ev, NULL);
163 8d1b399b 2021-07-22 op TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
166 8d1b399b 2021-07-22 op struct ctl_conn *
167 8d1b399b 2021-07-22 op control_connbyfd(int fd)
169 8d1b399b 2021-07-22 op struct ctl_conn *c;
171 8d1b399b 2021-07-22 op TAILQ_FOREACH(c, &ctl_conns, entry) {
172 8d1b399b 2021-07-22 op if (c->iev.ibuf.fd == fd)
179 8d1b399b 2021-07-22 op struct ctl_conn *
180 8d1b399b 2021-07-22 op control_connbypid(pid_t pid)
182 8d1b399b 2021-07-22 op struct ctl_conn *c;
184 8d1b399b 2021-07-22 op TAILQ_FOREACH(c, &ctl_conns, entry) {
185 8d1b399b 2021-07-22 op if (c->iev.ibuf.pid == pid)
193 8d1b399b 2021-07-22 op control_close(int fd)
195 8d1b399b 2021-07-22 op struct ctl_conn *c;
197 8d1b399b 2021-07-22 op if ((c = control_connbyfd(fd)) == NULL) {
198 8d1b399b 2021-07-22 op log_warnx("%s: fd %d: not found", __func__, fd);
202 8d1b399b 2021-07-22 op msgbuf_clear(&c->iev.ibuf.w);
203 8d1b399b 2021-07-22 op TAILQ_REMOVE(&ctl_conns, c, entry);
205 8d1b399b 2021-07-22 op event_del(&c->iev.ev);
206 8d1b399b 2021-07-22 op close(c->iev.ibuf.fd);
208 8d1b399b 2021-07-22 op /* Some file descriptors are available again. */
209 8d1b399b 2021-07-22 op if (evtimer_pending(&control_state.evt, NULL)) {
210 8d1b399b 2021-07-22 op evtimer_del(&control_state.evt);
211 8d1b399b 2021-07-22 op event_add(&control_state.ev, NULL);
218 8d1b399b 2021-07-22 op control_dispatch_imsg(int fd, short event, void *bula)
220 8d1b399b 2021-07-22 op struct ctl_conn *c;
221 8d1b399b 2021-07-22 op struct imsg imsg;
225 8d1b399b 2021-07-22 op if ((c = control_connbyfd(fd)) == NULL) {
226 8d1b399b 2021-07-22 op log_warnx("%s: fd %d: not found", __func__, fd);
230 8d1b399b 2021-07-22 op if (event & EV_READ) {
231 8d1b399b 2021-07-22 op if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) ||
233 8d1b399b 2021-07-22 op control_close(fd);
237 8d1b399b 2021-07-22 op if (event & EV_WRITE) {
238 8d1b399b 2021-07-22 op if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
239 8d1b399b 2021-07-22 op control_close(fd);
245 8d1b399b 2021-07-22 op if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
246 8d1b399b 2021-07-22 op control_close(fd);
252 8d1b399b 2021-07-22 op switch (imsg.hdr.type) {
253 8d1b399b 2021-07-22 op case IMSG_CTL_RELOAD:
254 8d1b399b 2021-07-22 op listener_imsg_compose_main(imsg.hdr.type, 0, NULL, 0);
256 8d1b399b 2021-07-22 op case IMSG_CTL_LOG_VERBOSE:
257 8d1b399b 2021-07-22 op if (IMSG_DATA_SIZE(imsg) != sizeof(verbose))
260 8d1b399b 2021-07-22 op /* Forward to all other processes. */
261 8d1b399b 2021-07-22 op listener_imsg_compose_main(imsg.hdr.type, imsg.hdr.pid,
262 8d1b399b 2021-07-22 op imsg.data, IMSG_DATA_SIZE(imsg));
264 8d1b399b 2021-07-22 op /* XXX: send to every client? */
266 8d1b399b 2021-07-22 op memcpy(&verbose, imsg.data, sizeof(verbose));
267 8d1b399b 2021-07-22 op log_setverbose(verbose);
270 8d1b399b 2021-07-22 op log_debug("%s: error handling imsg %d", __func__,
271 8d1b399b 2021-07-22 op imsg.hdr.type);
274 8d1b399b 2021-07-22 op imsg_free(&imsg);
277 8d1b399b 2021-07-22 op imsg_event_add(&c->iev);
281 8d1b399b 2021-07-22 op control_imsg_relay(struct imsg *imsg)
283 8d1b399b 2021-07-22 op struct ctl_conn *c;
285 8d1b399b 2021-07-22 op if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
288 8d1b399b 2021-07-22 op return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
289 8d1b399b 2021-07-22 op -1, imsg->data, IMSG_DATA_SIZE(*imsg)));