IABSD.fr/src/usr.sbin/ospf6d/control.c

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• Author : claudio
  Date : 2021-01-19 09:42:11
  Hash : bf1e0606
  Message : Do the same control cleanup as in ospfd. Move control_state and ctl_conns into control.c nothing outside needs access to this.

• usr.sbin/ospf6d/control.c

• /*	$OpenBSD: control.c,v 1.30 2021/01/19 09:42:11 claudio Exp $ */
  
  /*
   * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <sys/types.h>
  #include <sys/stat.h>
  #include <sys/socket.h>
  #include <sys/un.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  
  #include "ospf6d.h"
  #include "ospf6.h"
  #include "ospfe.h"
  #include "log.h"
  #include "control.h"
  
  TAILQ_HEAD(ctl_conns, ctl_conn)	ctl_conns = TAILQ_HEAD_INITIALIZER(ctl_conns);
  
  #define	CONTROL_BACKLOG	5
  
  struct ctl_conn	*control_connbyfd(int);
  struct ctl_conn	*control_connbypid(pid_t);
  void		 control_close(int);
  
  struct {
  	struct event	ev;
  	struct event	evt;
  	int		fd;
  } control_state;
  
  int
  control_check(char *path)
  {
  	struct sockaddr_un	 sun;
  	int			 fd;
  
  	bzero(&sun, sizeof(sun));
  	sun.sun_family = AF_UNIX;
  	strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
  
  	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
  		log_warn("control_check: socket check");
  		return (-1);
  	}
  
  	if (connect(fd, (struct sockaddr *)&sun, sizeof(sun)) == 0) {
  		log_warnx("control_check: socket in use");
  		close(fd);
  		return (-1);
  	}
  
  	close(fd);
  
  	return (0);
  }
  
  int
  control_init(char *path)
  {
  	struct sockaddr_un	 sun;
  	int			 fd;
  	mode_t			 old_umask;
  
  	if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
  	    0)) == -1) {
  		log_warn("control_init: socket");
  		return (-1);
  	}
  
  	bzero(&sun, sizeof(sun));
  	sun.sun_family = AF_UNIX;
  	strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
  
  	if (unlink(path) == -1)
  		if (errno != ENOENT) {
  			log_warn("control_init: unlink %s", path);
  			close(fd);
  			return (-1);
  		}
  
  	old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH);
  	if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) {
  		log_warn("control_init: bind: %s", path);
  		close(fd);
  		umask(old_umask);
  		return (-1);
  	}
  	umask(old_umask);
  
  	if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
  		log_warn("control_init: chmod");
  		close(fd);
  		(void)unlink(path);
  		return (-1);
  	}
  
  	return (fd);
  }
  
  int
  control_listen(int fd)
  {
  	control_state.fd = fd;
  
  	if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
  		log_warn("control_listen: listen");
  		return (-1);
  	}
  
  	event_set(&control_state.ev, control_state.fd, EV_READ,
  	    control_accept, NULL);
  	event_add(&control_state.ev, NULL);
  	evtimer_set(&control_state.evt, control_accept, NULL);
  
  	return (0);
  }
  
  void
  control_cleanup(void)
  {
  	event_del(&control_state.ev);
  	event_del(&control_state.evt);
  }
  
  /* ARGSUSED */
  void
  control_accept(int listenfd, short event, void *bula)
  {
  	int			 connfd;
  	socklen_t		 len;
  	struct sockaddr_un	 sun;
  	struct ctl_conn		*c;
  
  	event_add(&control_state.ev, NULL);
  	if ((event & EV_TIMEOUT))
  		return;
  
  	len = sizeof(sun);
  	if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
  	    SOCK_CLOEXEC | SOCK_NONBLOCK)) == -1) {
  		/*
  		 * Pause accept if we are out of file descriptors, or
  		 * libevent will haunt us here too.
  		 */
  		if (errno == ENFILE || errno == EMFILE) {
  			struct timeval evtpause = { 1, 0 };
  
  			event_del(&control_state.ev);
  			evtimer_add(&control_state.evt, &evtpause);
  		} else if (errno != EWOULDBLOCK && errno != EINTR &&
  		    errno != ECONNABORTED)
  			log_warn("control_accept: accept");
  		return;
  	}
  
  	if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
  		log_warn("control_accept");
  		close(connfd);
  		return;
  	}
  
  	imsg_init(&c->iev.ibuf, connfd);
  	c->iev.handler = control_dispatch_imsg;
  	c->iev.events = EV_READ;
  	event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events,
  	    c->iev.handler, &c->iev);
  	event_add(&c->iev.ev, NULL);
  
  	TAILQ_INSERT_TAIL(&ctl_conns, c, entry);
  }
  
  struct ctl_conn *
  control_connbyfd(int fd)
  {
  	struct ctl_conn	*c;
  
  	TAILQ_FOREACH(c, &ctl_conns, entry) {
  		if (c->iev.ibuf.fd == fd)
  			break;
  	}
  
  	return (c);
  }
  
  struct ctl_conn *
  control_connbypid(pid_t pid)
  {
  	struct ctl_conn	*c;
  
  	TAILQ_FOREACH(c, &ctl_conns, entry) {
  		if (c->iev.ibuf.pid == pid)
  			break;
  	}
  
  	return (c);
  }
  
  void
  control_close(int fd)
  {
  	struct ctl_conn	*c;
  
  	if ((c = control_connbyfd(fd)) == NULL) {
  		log_warn("control_close: fd %d: not found", fd);
  		return;
  	}
  
  	msgbuf_clear(&c->iev.ibuf.w);
  	TAILQ_REMOVE(&ctl_conns, c, entry);
  
  	event_del(&c->iev.ev);
  	close(c->iev.ibuf.fd);
  
  	/* Some file descriptors are available again. */
  	if (evtimer_pending(&control_state.evt, NULL)) {
  		evtimer_del(&control_state.evt);
  		event_add(&control_state.ev, NULL);
  	}
  
  	free(c);
  }
  
  /* ARGSUSED */
  void
  control_dispatch_imsg(int fd, short event, void *bula)
  {
  	struct ctl_conn	*c;
  	struct imsg	 imsg;
  	ssize_t		 n;
  	unsigned int	 ifidx;
  	int		 verbose;
  
  	if ((c = control_connbyfd(fd)) == NULL) {
  		log_warn("control_dispatch_imsg: fd %d: not found", fd);
  		return;
  	}
  
  	if (event & EV_READ) {
  		if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) ||
  		    n == 0) {
  			control_close(fd);
  			return;
  		}
  	}
  	if (event & EV_WRITE) {
  		if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) {
  			control_close(fd);
  			return;
  		}
  	}
  
  	for (;;) {
  		if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) {
  			control_close(fd);
  			return;
  		}
  
  		if (n == 0)
  			break;
  
  		switch (imsg.hdr.type) {
  		case IMSG_CTL_FIB_COUPLE:
  		case IMSG_CTL_FIB_DECOUPLE:
  			ospfe_fib_update(imsg.hdr.type);
  			/* FALLTHROUGH */
  		case IMSG_CTL_RELOAD:
  			c->iev.ibuf.pid = imsg.hdr.pid;
  			ospfe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0);
  			break;
  		case IMSG_CTL_KROUTE:
  		case IMSG_CTL_KROUTE_ADDR:
  			c->iev.ibuf.pid = imsg.hdr.pid;
  			ospfe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid,
  			    imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
  			break;
  		case IMSG_CTL_SHOW_INTERFACE:
  			if (imsg.hdr.len == IMSG_HEADER_SIZE +
  			    sizeof(ifidx)) {
  				memcpy(&ifidx, imsg.data, sizeof(ifidx));
  				ospfe_iface_ctl(c, ifidx);
  				imsg_compose_event(&c->iev, IMSG_CTL_END, 0,
  				    0, -1, NULL, 0);
  			}
  			break;
  		case IMSG_CTL_SHOW_DATABASE:
  		case IMSG_CTL_SHOW_DB_EXT:
  		case IMSG_CTL_SHOW_DB_LINK:
  		case IMSG_CTL_SHOW_DB_NET:
  		case IMSG_CTL_SHOW_DB_RTR:
  		case IMSG_CTL_SHOW_DB_INTRA:
  		case IMSG_CTL_SHOW_DB_SELF:
  		case IMSG_CTL_SHOW_DB_SUM:
  		case IMSG_CTL_SHOW_DB_ASBR:
  		case IMSG_CTL_SHOW_RIB:
  		case IMSG_CTL_SHOW_SUM:
  			c->iev.ibuf.pid = imsg.hdr.pid;
  			ospfe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid,
  			    imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
  			break;
  		case IMSG_CTL_SHOW_NBR:
  			ospfe_nbr_ctl(c);
  			break;
  		case IMSG_CTL_LOG_VERBOSE:
  			if (imsg.hdr.len != IMSG_HEADER_SIZE +
  			    sizeof(verbose))
  				break;
  
  			/* forward to other processes */
  			ospfe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid,
  			    imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
  			ospfe_imsg_compose_rde(imsg.hdr.type, 0, imsg.hdr.pid,
  			    imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE);
  
  			memcpy(&verbose, imsg.data, sizeof(verbose));
  			log_setverbose(verbose);
  			break;
  		default:
  			log_debug("control_dispatch_imsg: "
  			    "error handling imsg %d", imsg.hdr.type);
  			break;
  		}
  		imsg_free(&imsg);
  	}
  
  	imsg_event_add(&c->iev);
  }
  
  int
  control_imsg_relay(struct imsg *imsg)
  {
  	struct ctl_conn	*c;
  
  	if ((c = control_connbypid(imsg->hdr.pid)) == NULL)
  		return (0);
  
  	return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid,
  	    -1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE));
  }