2 fb1a36c0 2022-01-09 op * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
4 fb1a36c0 2022-01-09 op * Permission to use, copy, modify, and distribute this software for any
5 fb1a36c0 2022-01-09 op * purpose with or without fee is hereby granted, provided that the above
6 fb1a36c0 2022-01-09 op * copyright notice and this permission notice appear in all copies.
8 fb1a36c0 2022-01-09 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 fb1a36c0 2022-01-09 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 fb1a36c0 2022-01-09 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 fb1a36c0 2022-01-09 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 fb1a36c0 2022-01-09 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 fb1a36c0 2022-01-09 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 fb1a36c0 2022-01-09 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 fb1a36c0 2022-01-09 op #include <sys/types.h>
18 fb1a36c0 2022-01-09 op #include <sys/stat.h>
19 fb1a36c0 2022-01-09 op #include <sys/socket.h>
20 fb1a36c0 2022-01-09 op #include <sys/queue.h>
21 fb1a36c0 2022-01-09 op #include <sys/uio.h>
22 fb1a36c0 2022-01-09 op #include <sys/un.h>
24 fb1a36c0 2022-01-09 op #include <netinet/in.h>
25 fb1a36c0 2022-01-09 op #include <net/if.h>
27 fb1a36c0 2022-01-09 op #include <errno.h>
28 fb1a36c0 2022-01-09 op #include <event.h>
29 fb1a36c0 2022-01-09 op #include <stdint.h>
30 fb1a36c0 2022-01-09 op #include <stdlib.h>
31 fb1a36c0 2022-01-09 op #include <string.h>
32 fb1a36c0 2022-01-09 op #include <unistd.h>
33 fb1a36c0 2022-01-09 op #include <imsg.h>
35 fb1a36c0 2022-01-09 op #include "control.h"
36 fb1a36c0 2022-01-09 op #include "kamid.h"
37 fb1a36c0 2022-01-09 op #include "listener.h"
38 fb1a36c0 2022-01-09 op #include "log.h"
39 fb1a36c0 2022-01-09 op #include "utils.h"
41 fb1a36c0 2022-01-09 op #define CONTROL_BACKLOG 5
44 fb1a36c0 2022-01-09 op struct event ev;
45 fb1a36c0 2022-01-09 op struct event evt;
47 fb1a36c0 2022-01-09 op } control_state = {.fd = -1};
49 fb1a36c0 2022-01-09 op struct ctl_conn {
50 fb1a36c0 2022-01-09 op TAILQ_ENTRY(ctl_conn) entry;
51 fb1a36c0 2022-01-09 op struct imsgev iev;
54 fb1a36c0 2022-01-09 op TAILQ_HEAD(ctl_conns, ctl_conn) ctl_conns = TAILQ_HEAD_INITIALIZER(ctl_conns);
56 fb1a36c0 2022-01-09 op struct ctl_conn *control_connbyfd(int);
57 fb1a36c0 2022-01-09 op struct ctl_conn *control_connbypid(pid_t);
58 fb1a36c0 2022-01-09 op void control_close(int);
61 fb1a36c0 2022-01-09 op control_init(const char *path)
63 fb1a36c0 2022-01-09 op struct sockaddr_un sun;
65 fb1a36c0 2022-01-09 op mode_t old_umask;
67 fb1a36c0 2022-01-09 op if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
69 fb1a36c0 2022-01-09 op log_warn("%s: socket", __func__);
73 fb1a36c0 2022-01-09 op memset(&sun, 0, sizeof(sun));
74 fb1a36c0 2022-01-09 op sun.sun_family = AF_UNIX;
75 fb1a36c0 2022-01-09 op strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
77 fb1a36c0 2022-01-09 op if (unlink(path) == -1)
78 fb1a36c0 2022-01-09 op if (errno != ENOENT) {
79 fb1a36c0 2022-01-09 op log_warn("%s: unlink %s", __func__, path);
84 fb1a36c0 2022-01-09 op old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
85 fb1a36c0 2022-01-09 op if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
86 fb1a36c0 2022-01-09 op log_warn("%s: bind: %s", __func__, path);
88 fb1a36c0 2022-01-09 op umask(old_umask);
91 fb1a36c0 2022-01-09 op umask(old_umask);
93 fb1a36c0 2022-01-09 op if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
94 fb1a36c0 2022-01-09 op log_warn("%s: chmod", __func__);
96 fb1a36c0 2022-01-09 op (void)unlink(path);
104 fb1a36c0 2022-01-09 op control_listen(int fd)
106 fb1a36c0 2022-01-09 op if (control_state.fd != -1)
107 fb1a36c0 2022-01-09 op fatalx("%s: received unexpected controlsock", __func__);
109 fb1a36c0 2022-01-09 op control_state.fd = fd;
110 fb1a36c0 2022-01-09 op if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
111 fb1a36c0 2022-01-09 op log_warn("%s: listen", __func__);
115 fb1a36c0 2022-01-09 op event_set(&control_state.ev, control_state.fd, EV_READ,
116 fb1a36c0 2022-01-09 op control_accept, NULL);
117 fb1a36c0 2022-01-09 op event_add(&control_state.ev, NULL);
118 fb1a36c0 2022-01-09 op evtimer_set(&control_state.evt, control_accept, NULL);
124 fb1a36c0 2022-01-09 op control_accept(int listenfd, short event, void *bula)
127 fb1a36c0 2022-01-09 op socklen_t len;
128 fb1a36c0 2022-01-09 op struct sockaddr_un sun;
129 fb1a36c0 2022-01-09 op struct ctl_conn *c;
131 fb1a36c0 2022-01-09 op event_add(&control_state.ev, NULL);
132 fb1a36c0 2022-01-09 op if ((event & EV_TIMEOUT))
135 fb1a36c0 2022-01-09 op len = sizeof(sun);
136 fb1a36c0 2022-01-09 op if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
137 fb1a36c0 2022-01-09 op SOCK_CLOEXEC | SOCK_NONBLOCK)) == -1) {
139 fb1a36c0 2022-01-09 op * Pause accept if we are out of file descriptors, or
140 fb1a36c0 2022-01-09 op * libevent will haunt us here too.
142 fb1a36c0 2022-01-09 op if (errno == ENFILE || errno == EMFILE) {
143 fb1a36c0 2022-01-09 op struct timeval evtpause = { 1, 0 };
145 fb1a36c0 2022-01-09 op event_del(&control_state.ev);
146 fb1a36c0 2022-01-09 op evtimer_add(&control_state.evt, &evtpause);
147 fb1a36c0 2022-01-09 op } else if (errno != EWOULDBLOCK && errno != EINTR &&
148 fb1a36c0 2022-01-09 op errno != ECONNABORTED)
149 fb1a36c0 2022-01-09 op log_warn("%s: accept4", __func__);
153 fb1a36c0 2022-01-09 op if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
154 fb1a36c0 2022-01-09 op log_warn("%s: calloc", __func__);
155 fb1a36c0 2022-01-09 op close(connfd);
159 fb1a36c0 2022-01-09 op imsg_init(&c->iev.ibuf, connfd);
160 fb1a36c0 2022-01-09 op c->iev.handler = control_dispatch_imsg;
161 fb1a36c0 2022-01-09 op c->iev.events = EV_READ;
162 fb1a36c0 2022-01-09 op event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
163 fb1a36c0 2022-01-09 op c->iev.handler, &c->iev);
164 fb1a36c0 2022-01-09 op event_add(&c->iev.ev, NULL);
166 fb1a36c0 2022-01-09 op TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
169 fb1a36c0 2022-01-09 op struct ctl_conn *
170 fb1a36c0 2022-01-09 op control_connbyfd(int fd)
172 fb1a36c0 2022-01-09 op struct ctl_conn *c;
174 fb1a36c0 2022-01-09 op TAILQ_FOREACH(c, &ctl_conns, entry) {
175 fb1a36c0 2022-01-09 op if (c->iev.ibuf.fd == fd)
182 fb1a36c0 2022-01-09 op struct ctl_conn *
183 fb1a36c0 2022-01-09 op control_connbypid(pid_t pid)
185 fb1a36c0 2022-01-09 op struct ctl_conn *c;
187 fb1a36c0 2022-01-09 op TAILQ_FOREACH(c, &ctl_conns, entry) {
188 fb1a36c0 2022-01-09 op if (c->iev.ibuf.pid == pid)
196 fb1a36c0 2022-01-09 op control_close(int fd)
198 fb1a36c0 2022-01-09 op struct ctl_conn *c;
200 fb1a36c0 2022-01-09 op if ((c = control_connbyfd(fd)) == NULL) {
201 fb1a36c0 2022-01-09 op log_warnx("%s: fd %d: not found", __func__, fd);
205 fb1a36c0 2022-01-09 op msgbuf_clear(&c->iev.ibuf.w);
206 fb1a36c0 2022-01-09 op TAILQ_REMOVE(&ctl_conns, c, entry);
208 fb1a36c0 2022-01-09 op event_del(&c->iev.ev);
209 fb1a36c0 2022-01-09 op close(c->iev.ibuf.fd);
211 fb1a36c0 2022-01-09 op /* Some file descriptors are available again. */
212 fb1a36c0 2022-01-09 op if (evtimer_pending(&control_state.evt, NULL)) {
213 fb1a36c0 2022-01-09 op evtimer_del(&control_state.evt);
214 fb1a36c0 2022-01-09 op event_add(&control_state.ev, NULL);
221 fb1a36c0 2022-01-09 op control_dispatch_imsg(int fd, short event, void *bula)
223 fb1a36c0 2022-01-09 op struct ctl_conn *c;
224 fb1a36c0 2022-01-09 op struct imsg imsg;
228 fb1a36c0 2022-01-09 op if ((c = control_connbyfd(fd)) == NULL) {
229 fb1a36c0 2022-01-09 op log_warnx("%s: fd %d: not found", __func__, fd);
233 fb1a36c0 2022-01-09 op if (event & EV_READ) {
234 fb1a36c0 2022-01-09 op if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) ||
236 fb1a36c0 2022-01-09 op control_close(fd);
240 fb1a36c0 2022-01-09 op if (event & EV_WRITE) {
241 fb1a36c0 2022-01-09 op if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
242 fb1a36c0 2022-01-09 op control_close(fd);
248 fb1a36c0 2022-01-09 op if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
249 fb1a36c0 2022-01-09 op control_close(fd);
255 fb1a36c0 2022-01-09 op switch (imsg.hdr.type) {
256 fb1a36c0 2022-01-09 op case IMSG_CTL_RELOAD:
257 fb1a36c0 2022-01-09 op listener_imsg_compose_main(imsg.hdr.type, 0, NULL, 0);
259 fb1a36c0 2022-01-09 op case IMSG_CTL_LOG_VERBOSE:
260 fb1a36c0 2022-01-09 op if (IMSG_DATA_SIZE(imsg) != sizeof(verbose))
263 fb1a36c0 2022-01-09 op /* Forward to all other processes. */
264 fb1a36c0 2022-01-09 op listener_imsg_compose_main(imsg.hdr.type, imsg.hdr.pid,
265 fb1a36c0 2022-01-09 op imsg.data, IMSG_DATA_SIZE(imsg));
267 fb1a36c0 2022-01-09 op /* XXX: send to every client? */
269 fb1a36c0 2022-01-09 op memcpy(&verbose, imsg.data, sizeof(verbose));
270 fb1a36c0 2022-01-09 op log_setverbose(verbose);
273 fb1a36c0 2022-01-09 op log_debug("%s: error handling imsg %d", __func__,
274 fb1a36c0 2022-01-09 op imsg.hdr.type);
277 fb1a36c0 2022-01-09 op imsg_free(&imsg);
280 fb1a36c0 2022-01-09 op imsg_event_add(&c->iev);
284 fb1a36c0 2022-01-09 op control_imsg_relay(struct imsg *imsg)
286 fb1a36c0 2022-01-09 op struct ctl_conn *c;
288 fb1a36c0 2022-01-09 op if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
291 fb1a36c0 2022-01-09 op return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
292 fb1a36c0 2022-01-09 op -1, imsg->data, IMSG_DATA_SIZE(*imsg)));