293 lines
6.3 KiB
C
293 lines
6.3 KiB
C
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/* $OpenBSD: control.c,v 1.8 2021/03/02 04:10:07 jsg Exp $ */
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/*
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* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/queue.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <sys/un.h>
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#include <netinet/in.h>
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#include <net/if.h>
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#include <errno.h>
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#include <event.h>
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#include <imsg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "log.h"
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#include "rad.h"
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#include "control.h"
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#include "frontend.h"
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#define CONTROL_BACKLOG 5
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struct {
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struct event ev;
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struct event evt;
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int fd;
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} control_state = {.fd = -1};
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struct ctl_conn {
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TAILQ_ENTRY(ctl_conn) entry;
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struct imsgev iev;
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};
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TAILQ_HEAD(ctl_conns, ctl_conn) ctl_conns = TAILQ_HEAD_INITIALIZER(ctl_conns);
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struct ctl_conn *control_connbyfd(int);
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struct ctl_conn *control_connbypid(pid_t);
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void control_close(int);
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int
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control_init(char *path)
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{
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struct sockaddr_un sun;
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int fd;
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mode_t old_umask;
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if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
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0)) == -1) {
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log_warn("%s: socket", __func__);
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return (-1);
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}
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memset(&sun, 0, sizeof(sun));
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sun.sun_family = AF_UNIX;
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strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
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if (unlink(path) == -1)
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if (errno != ENOENT) {
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log_warn("%s: unlink %s", __func__, path);
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close(fd);
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return (-1);
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}
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old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
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if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
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log_warn("%s: bind: %s", __func__, path);
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close(fd);
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umask(old_umask);
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return (-1);
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}
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umask(old_umask);
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if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
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log_warn("%s: chmod", __func__);
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close(fd);
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(void)unlink(path);
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return (-1);
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}
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return (fd);
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}
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int
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control_listen(int fd)
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{
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if (control_state.fd != -1)
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fatalx("%s: received unexpected controlsock", __func__);
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control_state.fd = fd;
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if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
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log_warn("%s: listen", __func__);
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return (-1);
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}
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event_set(&control_state.ev, control_state.fd, EV_READ,
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control_accept, NULL);
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event_add(&control_state.ev, NULL);
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evtimer_set(&control_state.evt, control_accept, NULL);
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return (0);
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}
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void
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control_accept(int listenfd, short event, void *bula)
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{
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int connfd;
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socklen_t len;
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struct sockaddr_un sun;
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struct ctl_conn *c;
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event_add(&control_state.ev, NULL);
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if ((event & EV_TIMEOUT))
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return;
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len = sizeof(sun);
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if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
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SOCK_CLOEXEC | SOCK_NONBLOCK)) == -1) {
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/*
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* Pause accept if we are out of file descriptors, or
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* libevent will haunt us here too.
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*/
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if (errno == ENFILE || errno == EMFILE) {
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struct timeval evtpause = { 1, 0 };
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event_del(&control_state.ev);
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evtimer_add(&control_state.evt, &evtpause);
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} else if (errno != EWOULDBLOCK && errno != EINTR &&
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errno != ECONNABORTED)
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log_warn("%s: accept4", __func__);
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return;
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}
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if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
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log_warn("%s: calloc", __func__);
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close(connfd);
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return;
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}
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imsg_init(&c->iev.ibuf, connfd);
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c->iev.handler = control_dispatch_imsg;
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c->iev.events = EV_READ;
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event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
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c->iev.handler, &c->iev);
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event_add(&c->iev.ev, NULL);
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TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
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}
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struct ctl_conn *
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control_connbyfd(int fd)
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{
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struct ctl_conn *c;
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TAILQ_FOREACH(c, &ctl_conns, entry) {
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if (c->iev.ibuf.fd == fd)
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break;
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}
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return (c);
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}
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struct ctl_conn *
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control_connbypid(pid_t pid)
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{
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struct ctl_conn *c;
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TAILQ_FOREACH(c, &ctl_conns, entry) {
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if (c->iev.ibuf.pid == pid)
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break;
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}
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return (c);
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}
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void
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control_close(int fd)
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{
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struct ctl_conn *c;
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if ((c = control_connbyfd(fd)) == NULL) {
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log_warnx("%s: fd %d: not found", __func__, fd);
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return;
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}
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msgbuf_clear(&c->iev.ibuf.w);
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TAILQ_REMOVE(&ctl_conns, c, entry);
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event_del(&c->iev.ev);
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close(c->iev.ibuf.fd);
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/* Some file descriptors are available again. */
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if (evtimer_pending(&control_state.evt, NULL)) {
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evtimer_del(&control_state.evt);
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event_add(&control_state.ev, NULL);
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}
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free(c);
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}
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void
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control_dispatch_imsg(int fd, short event, void *bula)
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{
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struct ctl_conn *c;
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struct imsg imsg;
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ssize_t n;
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int verbose;
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if ((c = control_connbyfd(fd)) == NULL) {
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log_warnx("%s: fd %d: not found", __func__, fd);
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return;
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}
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if (event & EV_READ) {
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if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) ||
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n == 0) {
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control_close(fd);
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return;
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}
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}
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if (event & EV_WRITE) {
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if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
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control_close(fd);
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return;
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}
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}
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for (;;) {
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if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
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control_close(fd);
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return;
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}
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if (n == 0)
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break;
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switch (imsg.hdr.type) {
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case IMSG_CTL_RELOAD:
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frontend_imsg_compose_main(imsg.hdr.type, 0, NULL, 0);
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break;
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case IMSG_CTL_LOG_VERBOSE:
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if (IMSG_DATA_SIZE(imsg) != sizeof(verbose))
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break;
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/* Forward to all other processes. */
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frontend_imsg_compose_main(imsg.hdr.type, imsg.hdr.pid,
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imsg.data, IMSG_DATA_SIZE(imsg));
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frontend_imsg_compose_engine(imsg.hdr.type,
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imsg.hdr.pid, imsg.data, IMSG_DATA_SIZE(imsg));
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memcpy(&verbose, imsg.data, sizeof(verbose));
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log_setverbose(verbose);
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break;
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default:
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log_debug("%s: error handling imsg %d", __func__,
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imsg.hdr.type);
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break;
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}
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imsg_free(&imsg);
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}
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imsg_event_add(&c->iev);
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}
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int
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control_imsg_relay(struct imsg *imsg)
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{
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struct ctl_conn *c;
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if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
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return (0);
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return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
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-1, imsg->data, IMSG_DATA_SIZE(*imsg)));
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}
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