GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/httpd/control.c Lines: 2 145 1.4 %
Date: 2017-11-13 Branches: 1 84 1.2 %

Line Branch Exec Source
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/*	$OpenBSD: control.c,v 1.13 2017/01/09 14:49:22 reyk 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/queue.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/un.h>
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#include <errno.h>
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#include <event.h>
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#include <fcntl.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 <imsg.h>
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#include "httpd.h"
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#define	CONTROL_BACKLOG	5
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struct ctl_connlist ctl_conns;
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void		 control_accept(int, short, void *);
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void		 control_close(int, struct control_sock *);
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int
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control_init(struct privsep *ps, struct control_sock *cs)
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{
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	struct httpd		*env = ps->ps_env;
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	struct sockaddr_un	 sun;
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	int			 fd;
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	mode_t			 old_umask, mode;
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	if (cs->cs_name == NULL)
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		return (0);
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	if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 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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	sun.sun_family = AF_UNIX;
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	if (strlcpy(sun.sun_path, cs->cs_name,
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	    sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) {
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		log_warn("%s: %s name too long", __func__, cs->cs_name);
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		close(fd);
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		return (-1);
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	}
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	if (unlink(cs->cs_name) == -1)
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		if (errno != ENOENT) {
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			log_warn("%s: unlink %s", __func__, cs->cs_name);
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			close(fd);
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			return (-1);
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		}
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	if (cs->cs_restricted) {
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		old_umask = umask(S_IXUSR|S_IXGRP|S_IXOTH);
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		mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH;
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	} else {
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		old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
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		mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP;
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	}
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	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
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		log_warn("%s: bind: %s", __func__, cs->cs_name);
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		close(fd);
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		(void)umask(old_umask);
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		return (-1);
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	}
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	(void)umask(old_umask);
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	if (chmod(cs->cs_name, mode) == -1) {
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		log_warn("%s: chmod", __func__);
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		close(fd);
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		(void)unlink(cs->cs_name);
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		return (-1);
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	}
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	cs->cs_fd = fd;
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	cs->cs_env = env;
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	return (0);
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}
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int
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control_listen(struct control_sock *cs)
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{
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	if (cs->cs_name == NULL)
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		return (0);
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	if (listen(cs->cs_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(&cs->cs_ev, cs->cs_fd, EV_READ,
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	    control_accept, cs);
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	event_add(&cs->cs_ev, NULL);
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	evtimer_set(&cs->cs_evt, control_accept, cs);
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	return (0);
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}
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void
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control_cleanup(struct control_sock *cs)
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{
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	if (cs->cs_name == NULL)
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		return;
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	event_del(&cs->cs_ev);
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	event_del(&cs->cs_evt);
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}
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/* ARGSUSED */
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void
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control_accept(int listenfd, short event, void *arg)
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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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	struct control_sock	*cs = arg;
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	event_add(&cs->cs_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,
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	    (struct sockaddr *)&sun, &len, 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(&cs->cs_ev);
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			evtimer_add(&cs->cs_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: accept", __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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		close(connfd);
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		log_warn("%s: calloc", __func__);
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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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	c->iev.data = cs;	/* proc.c cheats (reuses the handler) */
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	event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
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	    c->iev.handler, cs);
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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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void
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control_close(int fd, struct control_sock *cs)
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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_warn("%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(&cs->cs_evt, NULL)) {
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		evtimer_del(&cs->cs_evt);
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		event_add(&cs->cs_ev, NULL);
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	}
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	free(c);
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}
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/* ARGSUSED */
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void
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control_dispatch_imsg(int fd, short event, void *arg)
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{
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	struct control_sock	*cs = arg;
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	struct ctl_conn		*c;
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	struct imsg		 imsg;
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	int			 n;
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	int			 verbose;
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	struct httpd		*env = cs->cs_env;
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	if ((c = control_connbyfd(fd)) == NULL) {
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		log_warn("%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, cs);
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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, cs);
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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, cs);
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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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		if (c->waiting) {
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			log_debug("%s: unexpected imsg %d",
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			    __func__, imsg.hdr.type);
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			imsg_free(&imsg);
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			control_close(fd, cs);
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			return;
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		}
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		switch (imsg.hdr.type) {
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		case IMSG_CTL_SHUTDOWN:
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		case IMSG_CTL_RELOAD:
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		case IMSG_CTL_REOPEN:
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			proc_forward_imsg(env->sc_ps, &imsg, PROC_PARENT, -1);
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			break;
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		case IMSG_CTL_NOTIFY:
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			if (c->flags & CTL_CONN_NOTIFY) {
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				log_debug("%s: "
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				    "client requested notify more than once",
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				    __func__);
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				imsg_compose_event(&c->iev, IMSG_CTL_FAIL,
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				    0, env->sc_ps->ps_instance + 1, -1,
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				    NULL, 0);
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				break;
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			}
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			c->flags |= CTL_CONN_NOTIFY;
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			break;
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		case IMSG_CTL_VERBOSE:
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			IMSG_SIZE_CHECK(&imsg, &verbose);
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			memcpy(&verbose, imsg.data, sizeof(verbose));
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			proc_forward_imsg(env->sc_ps, &imsg, PROC_PARENT, -1);
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			proc_forward_imsg(env->sc_ps, &imsg, PROC_SERVER, -1);
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			memcpy(imsg.data, &verbose, sizeof(verbose));
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			control_imsg_forward(env->sc_ps, &imsg);
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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",
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			    __func__, 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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void
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control_imsg_forward(struct privsep *ps, struct imsg *imsg)
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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->flags & CTL_CONN_NOTIFY)
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			imsg_compose_event(&c->iev, imsg->hdr.type,
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			    0, ps->ps_instance + 1, -1, imsg->data,
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			    imsg->hdr.len - IMSG_HEADER_SIZE);
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}