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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	sbin/iked/proc.c	Lines:	0	238	0.0 %
Date:	2016-12-06	Branches:	0	176	0.0 %


/*	$OpenBSD: proc.c,v 1.29 2015/12/07 16:05:56 reyk Exp $	*/

/*
 * Copyright (c) 2010 - 2014 Reyk Floeter <reyk@openbsd.org>
 * Copyright (c) 2008 Pierre-Yves Ritschard <pyr@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/queue.h>
#include <sys/socket.h>
#include <sys/wait.h>

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <pwd.h>
#include <event.h>
#include <imsg.h>

#include "iked.h"

void	 proc_open(struct privsep *, struct privsep_proc *,
	    struct privsep_proc *, size_t);
void	 proc_close(struct privsep *);
int	 proc_ispeer(struct privsep_proc *, unsigned int, enum privsep_procid);
void	 proc_shutdown(struct privsep_proc *);
void	 proc_sig_handler(int, short, void *);
void	 proc_range(struct privsep *, enum privsep_procid, int *, int *);
int	 proc_dispatch_null(int, struct privsep_proc *, struct imsg *);

int
proc_ispeer(struct privsep_proc *procs, unsigned int nproc,
    enum privsep_procid type)
{
	unsigned int	i;

	for (i = 0; i < nproc; i++)
		if (procs[i].p_id == type)
			return (1);
	return (0);
}

void
proc_init(struct privsep *ps, struct privsep_proc *procs, unsigned int nproc)
{
	unsigned int		 i, j, src, dst;
	struct privsep_pipes	*pp;

	/*
	 * Allocate pipes for all process instances (incl. parent)
	 *
	 * - ps->ps_pipes: N:M mapping
	 * N source processes connected to M destination processes:
	 * [src][instances][dst][instances], for example
	 * [PROC_RELAY][3][PROC_CA][3]
	 *
	 * - ps->ps_pp: per-process 1:M part of ps->ps_pipes
	 * Each process instance has a destination array of socketpair fds:
	 * [dst][instances], for example
	 * [PROC_PARENT][0]
	 */
	for (src = 0; src < PROC_MAX; src++) {
		/* Allocate destination array for each process */
		if ((ps->ps_pipes[src] = calloc(ps->ps_ninstances,
		    sizeof(struct privsep_pipes))) == NULL)
			fatal("proc_init: calloc");

		for (i = 0; i < ps->ps_ninstances; i++) {
			pp = &ps->ps_pipes[src][i];

			for (dst = 0; dst < PROC_MAX; dst++) {
				/* Allocate maximum fd integers */
				if ((pp->pp_pipes[dst] =
				    calloc(ps->ps_ninstances,
				    sizeof(int))) == NULL)
					fatal("proc_init: calloc");

				/* Mark fd as unused */
				for (j = 0; j < ps->ps_ninstances; j++)
					pp->pp_pipes[dst][j] = -1;
			}
		}
	}

	/*
	 * Setup and run the parent and its children
	 */
	privsep_process = PROC_PARENT;
	ps->ps_instances[PROC_PARENT] = 1;
	ps->ps_title[PROC_PARENT] = "parent";
	ps->ps_pid[PROC_PARENT] = getpid();
	ps->ps_pp = &ps->ps_pipes[privsep_process][0];

	for (i = 0; i < nproc; i++) {
		/* Default to 1 process instance */
		if (ps->ps_instances[procs[i].p_id] < 1)
			ps->ps_instances[procs[i].p_id] = 1;
		ps->ps_title[procs[i].p_id] = procs[i].p_title;
	}

	proc_open(ps, NULL, procs, nproc);

	/* Engage! */
	for (i = 0; i < nproc; i++)
		ps->ps_pid[procs[i].p_id] = (*procs[i].p_init)(ps, &procs[i]);
}

void
proc_kill(struct privsep *ps)
{
	pid_t		 pid;
	unsigned int	 i;

	if (privsep_process != PROC_PARENT)
		return;

	for (i = 0; i < PROC_MAX; i++) {
		if (ps->ps_pid[i] == 0)
			continue;
		killpg(ps->ps_pid[i], SIGTERM);
	}

	do {
		pid = waitpid(WAIT_ANY, NULL, 0);
	} while (pid != -1 || (pid == -1 && errno == EINTR));

	proc_close(ps);
}

void
proc_open(struct privsep *ps, struct privsep_proc *p,
    struct privsep_proc *procs, size_t nproc)
{
	struct privsep_pipes	*pa, *pb;
	int			 fds[2];
	unsigned int		 i, j, src, proc;

	if (p == NULL)
		src = privsep_process; /* parent */
	else
		src = p->p_id;

	/*
	 * Open socket pairs for our peers
	 */
	for (proc = 0; proc < nproc; proc++) {
		procs[proc].p_ps = ps;
		procs[proc].p_env = ps->ps_env;
		if (procs[proc].p_cb == NULL)
			procs[proc].p_cb = proc_dispatch_null;

		for (i = 0; i < ps->ps_instances[src]; i++) {
			for (j = 0; j < ps->ps_instances[procs[proc].p_id];
			    j++) {
				pa = &ps->ps_pipes[src][i];
				pb = &ps->ps_pipes[procs[proc].p_id][j];

				/* Check if fds are already set by peer */
				if (pa->pp_pipes[procs[proc].p_id][j] != -1)
					continue;

				if (socketpair(AF_UNIX,
				    SOCK_STREAM | SOCK_NONBLOCK,
				    PF_UNSPEC, fds) == -1)
					fatal("socketpair");

				pa->pp_pipes[procs[proc].p_id][j] = fds[0];
				pb->pp_pipes[src][i] = fds[1];
			}
		}
	}
}

void
proc_listen(struct privsep *ps, struct privsep_proc *procs, size_t nproc)
{
	unsigned int		 i, dst, src, n, m;
	struct privsep_pipes	*pp;

	/*
	 * Close unused pipes
	 */
	for (src = 0; src < PROC_MAX; src++) {
		for (n = 0; n < ps->ps_instances[src]; n++) {
			/* Ingore current process */
			if (src == (unsigned int)privsep_process &&
			    n == ps->ps_instance)
				continue;

			pp = &ps->ps_pipes[src][n];

			for (dst = 0; dst < PROC_MAX; dst++) {
				if (src == dst)
					continue;
				for (m = 0; m < ps->ps_instances[dst]; m++) {
					if (pp->pp_pipes[dst][m] == -1)
						continue;

					/* Close and invalidate fd */
					close(pp->pp_pipes[dst][m]);
					pp->pp_pipes[dst][m] = -1;
				}
			}
		}
	}

	src = privsep_process;
	ps->ps_pp = pp = &ps->ps_pipes[src][ps->ps_instance];

	/*
	 * Listen on appropriate pipes
	 */
	for (i = 0; i < nproc; i++) {
		dst = procs[i].p_id;

		if (src == dst)
			fatal("proc_listen: cannot peer with oneself");

		if ((ps->ps_ievs[dst] = calloc(ps->ps_instances[dst],
		    sizeof(struct imsgev))) == NULL)
			fatal("proc_open");

		for (n = 0; n < ps->ps_instances[dst]; n++) {
			if (pp->pp_pipes[dst][n] == -1)
				continue;

			imsg_init(&(ps->ps_ievs[dst][n].ibuf),
			    pp->pp_pipes[dst][n]);
			ps->ps_ievs[dst][n].handler = proc_dispatch;
			ps->ps_ievs[dst][n].events = EV_READ;
			ps->ps_ievs[dst][n].proc = &procs[i];
			ps->ps_ievs[dst][n].data = &ps->ps_ievs[dst][n];
			procs[i].p_instance = n;

			event_set(&(ps->ps_ievs[dst][n].ev),
			    ps->ps_ievs[dst][n].ibuf.fd,
			    ps->ps_ievs[dst][n].events,
			    ps->ps_ievs[dst][n].handler,
			    ps->ps_ievs[dst][n].data);
			event_add(&(ps->ps_ievs[dst][n].ev), NULL);
		}
	}
}

void
proc_close(struct privsep *ps)
{
	unsigned int		 dst, n;
	struct privsep_pipes	*pp;

	if (ps == NULL)
		return;

	pp = ps->ps_pp;

	for (dst = 0; dst < PROC_MAX; dst++) {
		if (ps->ps_ievs[dst] == NULL)
			continue;

		for (n = 0; n < ps->ps_instances[dst]; n++) {
			if (pp->pp_pipes[dst][n] == -1)
				continue;

			/* Cancel the fd, close and invalidate the fd */
			event_del(&(ps->ps_ievs[dst][n].ev));
			imsg_clear(&(ps->ps_ievs[dst][n].ibuf));
			close(pp->pp_pipes[dst][n]);
			pp->pp_pipes[dst][n] = -1;
		}
		free(ps->ps_ievs[dst]);
	}
}

void
proc_shutdown(struct privsep_proc *p)
{
	struct privsep	*ps = p->p_ps;

	if (p->p_id == PROC_CONTROL && ps)
		control_cleanup(&ps->ps_csock);

	if (p->p_shutdown != NULL)
		(*p->p_shutdown)();

	proc_close(ps);

	log_info("%s exiting, pid %d", p->p_title, getpid());

	_exit(0);
}

void
proc_sig_handler(int sig, short event, void *arg)
{
	struct privsep_proc	*p = arg;

	switch (sig) {
	case SIGINT:
	case SIGTERM:
		proc_shutdown(p);
		break;
	case SIGCHLD:
	case SIGHUP:
	case SIGPIPE:
	case SIGUSR1:
		/* ignore */
		break;
	default:
		fatalx("proc_sig_handler: unexpected signal");
		/* NOTREACHED */
	}
}

pid_t
proc_run(struct privsep *ps, struct privsep_proc *p,
    struct privsep_proc *procs, unsigned int nproc,
    void (*run)(struct privsep *, struct privsep_proc *, void *), void *arg)
{
	pid_t			 pid;
	struct passwd		*pw;
	const char		*root;
	struct control_sock	*rcs;
	unsigned int		 n;

	if (ps->ps_noaction)
		return (0);

	proc_open(ps, p, procs, nproc);

	/* Fork child handlers */
	switch (pid = fork()) {
	case -1:
		fatal("proc_run: cannot fork");
	case 0:
		log_procinit(p->p_title);

		/* Set the process group of the current process */
		setpgid(0, 0);
		break;
	default:
		return (pid);
	}

	pw = ps->ps_pw;

	if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) {
		if (control_init(ps, &ps->ps_csock) == -1)
			fatalx(__func__);
		TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry)
			if (control_init(ps, rcs) == -1)
				fatalx(__func__);
	}

	/* Change root directory */
	if (p->p_chroot != NULL)
		root = p->p_chroot;
	else
		root = pw->pw_dir;

	if (chroot(root) == -1)
		fatal("proc_run: chroot");
	if (chdir("/") == -1)
		fatal("proc_run: chdir(\"/\")");

	privsep_process = p->p_id;

	setproctitle("%s", p->p_title);

	if (setgroups(1, &pw->pw_gid) ||
	    setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) ||
	    setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
		fatal("proc_run: cannot drop privileges");

	/* Fork child handlers */
	for (n = 1; n < ps->ps_instances[p->p_id]; n++) {
		if (fork() == 0) {
			ps->ps_instance = p->p_instance = n;
			break;
		}
	}

#ifdef DEBUG
	log_debug("%s: %s %d/%d, pid %d", __func__, p->p_title,
	    ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid());
#endif

	event_init();

	signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p);
	signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p);
	signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p);
	signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p);
	signal_set(&ps->ps_evsigpipe, SIGPIPE, proc_sig_handler, p);
	signal_set(&ps->ps_evsigusr1, SIGUSR1, proc_sig_handler, p);

	signal_add(&ps->ps_evsigint, NULL);
	signal_add(&ps->ps_evsigterm, NULL);
	signal_add(&ps->ps_evsigchld, NULL);
	signal_add(&ps->ps_evsighup, NULL);
	signal_add(&ps->ps_evsigpipe, NULL);
	signal_add(&ps->ps_evsigusr1, NULL);

	proc_listen(ps, procs, nproc);

	if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) {
		TAILQ_INIT(&ctl_conns);
		if (control_listen(&ps->ps_csock) == -1)
			fatalx(__func__);
		TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry)
			if (control_listen(rcs) == -1)
				fatalx(__func__);
	}

	if (run != NULL)
		run(ps, p, arg);

	event_dispatch();

	proc_shutdown(p);

	return (0);
}

void
proc_dispatch(int fd, short event, void *arg)
{
	struct imsgev		*iev = arg;
	struct privsep_proc	*p = iev->proc;
	struct privsep		*ps = p->p_ps;
	struct imsgbuf		*ibuf;
	struct imsg		 imsg;
	ssize_t			 n;
	int			 verbose;
	const char		*title;

	title = ps->ps_title[privsep_process];
	ibuf = &iev->ibuf;

	if (event & EV_READ) {
		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
			fatal(__func__);
		if (n == 0) {
			/* this pipe is dead, so remove the event handler */
			event_del(&iev->ev);
			event_loopexit(NULL);
			return;
		}
	}

	if (event & EV_WRITE) {
		if (msgbuf_write(&ibuf->w) <= 0 && errno != EAGAIN)
			fatal(__func__);
	}

	for (;;) {
		if ((n = imsg_get(ibuf, &imsg)) == -1)
			fatal(__func__);
		if (n == 0)
			break;

#if DEBUG > 1
		log_debug("%s: %s %d got imsg %d peerid %d from %s %d",
		    __func__, title, ps->ps_instance + 1,
		    imsg.hdr.type, imsg.hdr.peerid, p->p_title, p->p_instance);
#endif

		/*
		 * Check the message with the program callback
		 */
		if ((p->p_cb)(fd, p, &imsg) == 0) {
			/* Message was handled by the callback, continue */
			imsg_free(&imsg);
			continue;
		}

		/*
		 * Generic message handling
		 */
		switch (imsg.hdr.type) {
		case IMSG_CTL_VERBOSE:
			IMSG_SIZE_CHECK(&imsg, &verbose);
			memcpy(&verbose, imsg.data, sizeof(verbose));
			log_verbose(verbose);
			break;
		default:
			log_warnx("%s: %s %d got invalid imsg %d peerid %d "
			    "from %s %d",
			    __func__, title, ps->ps_instance + 1,
			    imsg.hdr.type, imsg.hdr.peerid,
			    p->p_title, p->p_instance);
			fatalx(__func__);
		}
		imsg_free(&imsg);
	}
	imsg_event_add(iev);
}

int
proc_dispatch_null(int fd, struct privsep_proc *p, struct imsg *imsg)
{
	return (-1);
}

/*
 * imsg helper functions
 */

void
imsg_event_add(struct imsgev *iev)
{
	if (iev->handler == NULL) {
		imsg_flush(&iev->ibuf);
		return;
	}

	iev->events = EV_READ;
	if (iev->ibuf.w.queued)
		iev->events |= EV_WRITE;

	event_del(&iev->ev);
	event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
	event_add(&iev->ev, NULL);
}

int
imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
    pid_t pid, int fd, void *data, uint16_t datalen)
{
	int	ret;

	if ((ret = imsg_compose(&iev->ibuf, type, peerid,
	    pid, fd, data, datalen)) == -1)
		return (ret);
	imsg_event_add(iev);
	return (ret);
}

int
imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
    pid_t pid, int fd, const struct iovec *iov, int iovcnt)
{
	int	ret;

	if ((ret = imsg_composev(&iev->ibuf, type, peerid,
	    pid, fd, iov, iovcnt)) == -1)
		return (ret);
	imsg_event_add(iev);
	return (ret);
}

void
proc_range(struct privsep *ps, enum privsep_procid id, int *n, int *m)
{
	if (*n == -1) {
		/* Use a range of all target instances */
		*n = 0;
		*m = ps->ps_instances[id];
	} else {
		/* Use only a single slot of the specified peer process */
		*m = *n + 1;
	}
}

int
proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n,
    uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen)
{
	int	 m;

	proc_range(ps, id, &n, &m);
	for (; n < m; n++) {
		if (imsg_compose_event(&ps->ps_ievs[id][n],
		    type, peerid, 0, fd, data, datalen) == -1)
			return (-1);
	}

	return (0);
}

int
proc_compose(struct privsep *ps, enum privsep_procid id,
    uint16_t type, void *data, uint16_t datalen)
{
	return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen));
}

int
proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n,
    uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt)
{
	int	 m;

	proc_range(ps, id, &n, &m);
	for (; n < m; n++)
		if (imsg_composev_event(&ps->ps_ievs[id][n],
		    type, peerid, 0, fd, iov, iovcnt) == -1)
			return (-1);

	return (0);
}

int
proc_composev(struct privsep *ps, enum privsep_procid id,
    uint16_t type, const struct iovec *iov, int iovcnt)
{
	return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt));
}

int
proc_forward_imsg(struct privsep *ps, struct imsg *imsg,
    enum privsep_procid id, int n)
{
	return (proc_compose_imsg(ps, id, n, imsg->hdr.type,
	    imsg->hdr.peerid, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg)));
}

struct imsgbuf *
proc_ibuf(struct privsep *ps, enum privsep_procid id, int n)
{
	int	 m;

	proc_range(ps, id, &n, &m);
	return (&ps->ps_ievs[id][n].ibuf);
}

struct imsgev *
proc_iev(struct privsep *ps, enum privsep_procid id, int n)
{
	int	 m;

	proc_range(ps, id, &n, &m);
	return (&ps->ps_ievs[id][n]);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: proc.c,v 1.29 2015/12/07 16:05:56 reyk Exp $ */
2
3			/*
4			* Copyright (c) 2010 - 2014 Reyk Floeter <reyk@openbsd.org>
5			* Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
6			*
7			* Permission to use, copy, modify, and distribute this software for any
8			* purpose with or without fee is hereby granted, provided that the above
9			* copyright notice and this permission notice appear in all copies.
10			*
11			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18			*/
19
20			#include <sys/types.h>
21			#include <sys/queue.h>
22			#include <sys/socket.h>
23			#include <sys/wait.h>
24
25			#include <stdio.h>
26			#include <stdlib.h>
27			#include <unistd.h>
28			#include <string.h>
29			#include <errno.h>
30			#include <signal.h>
31			#include <pwd.h>
32			#include <event.h>
33			#include <imsg.h>
34
35			#include "iked.h"
36
37			void proc_open(struct privsep , struct privsep_proc ,
38			struct privsep_proc *, size_t);
39			void proc_close(struct privsep *);
40			int proc_ispeer(struct privsep_proc *, unsigned int, enum privsep_procid);
41			void proc_shutdown(struct privsep_proc *);
42			void proc_sig_handler(int, short, void *);
43			void proc_range(struct privsep , enum privsep_procid, int , int *);
44			int proc_dispatch_null(int, struct privsep_proc , struct imsg );
45
46			int
47			proc_ispeer(struct privsep_proc *procs, unsigned int nproc,
48			enum privsep_procid type)
49			{
50			unsigned int i;
51
52			for (i = 0; i < nproc; i++)
53			if (procs[i].p_id == type)
54			return (1);
55			return (0);
56			}
57
58			void
59			proc_init(struct privsep ps, struct privsep_proc procs, unsigned int nproc)
60			{
61			unsigned int i, j, src, dst;
62			struct privsep_pipes *pp;
63
64			/*
65			* Allocate pipes for all process instances (incl. parent)
66			*
67			* - ps->ps_pipes: N:M mapping
68			* N source processes connected to M destination processes:
69			* [src][instances][dst][instances], for example
70			* [PROC_RELAY][3][PROC_CA][3]
71			*
72			* - ps->ps_pp: per-process 1:M part of ps->ps_pipes
73			* Each process instance has a destination array of socketpair fds:
74			* [dst][instances], for example
75			* [PROC_PARENT][0]
76			*/
77			for (src = 0; src < PROC_MAX; src++) {
78			/* Allocate destination array for each process */
79			if ((ps->ps_pipes[src] = calloc(ps->ps_ninstances,
80			sizeof(struct privsep_pipes))) == NULL)
81			fatal("proc_init: calloc");
82
83			for (i = 0; i < ps->ps_ninstances; i++) {
84			pp = &ps->ps_pipes[src][i];
85
86			for (dst = 0; dst < PROC_MAX; dst++) {
87			/* Allocate maximum fd integers */
88			if ((pp->pp_pipes[dst] =
89			calloc(ps->ps_ninstances,
90			sizeof(int))) == NULL)
91			fatal("proc_init: calloc");
92
93			/* Mark fd as unused */
94			for (j = 0; j < ps->ps_ninstances; j++)
95			pp->pp_pipes[dst][j] = -1;
96			}
97			}
98			}
99
100			/*
101			* Setup and run the parent and its children
102			*/
103			privsep_process = PROC_PARENT;
104			ps->ps_instances[PROC_PARENT] = 1;
105			ps->ps_title[PROC_PARENT] = "parent";
106			ps->ps_pid[PROC_PARENT] = getpid();
107			ps->ps_pp = &ps->ps_pipes[privsep_process][0];
108
109			for (i = 0; i < nproc; i++) {
110			/* Default to 1 process instance */
111			if (ps->ps_instances[procs[i].p_id] < 1)
112			ps->ps_instances[procs[i].p_id] = 1;
113			ps->ps_title[procs[i].p_id] = procs[i].p_title;
114			}
115
116			proc_open(ps, NULL, procs, nproc);
117
118			/* Engage! */
119			for (i = 0; i < nproc; i++)
120			ps->ps_pid[procs[i].p_id] = (*procs[i].p_init)(ps, &procs[i]);
121			}
122
123			void
124			proc_kill(struct privsep *ps)
125			{
126			pid_t pid;
127			unsigned int i;
128
129			if (privsep_process != PROC_PARENT)
130			return;
131
132			for (i = 0; i < PROC_MAX; i++) {
133			if (ps->ps_pid[i] == 0)
134			continue;
135			killpg(ps->ps_pid[i], SIGTERM);
136			}
137
138			do {
139			pid = waitpid(WAIT_ANY, NULL, 0);
140			} while (pid != -1 \|\| (pid == -1 && errno == EINTR));
141
142			proc_close(ps);
143			}
144
145			void
146			proc_open(struct privsep ps, struct privsep_proc p,
147			struct privsep_proc *procs, size_t nproc)
148			{
149			struct privsep_pipes pa, pb;
150			int fds[2];
151			unsigned int i, j, src, proc;
152
153			if (p == NULL)
154			src = privsep_process; /* parent */
155			else
156			src = p->p_id;
157
158			/*
159			* Open socket pairs for our peers
160			*/
161			for (proc = 0; proc < nproc; proc++) {
162			procs[proc].p_ps = ps;
163			procs[proc].p_env = ps->ps_env;
164			if (procs[proc].p_cb == NULL)
165			procs[proc].p_cb = proc_dispatch_null;
166
167			for (i = 0; i < ps->ps_instances[src]; i++) {
168			for (j = 0; j < ps->ps_instances[procs[proc].p_id];
169			j++) {
170			pa = &ps->ps_pipes[src][i];
171			pb = &ps->ps_pipes[procs[proc].p_id][j];
172
173			/* Check if fds are already set by peer */
174			if (pa->pp_pipes[procs[proc].p_id][j] != -1)
175			continue;
176
177			if (socketpair(AF_UNIX,
178			SOCK_STREAM \| SOCK_NONBLOCK,
179			PF_UNSPEC, fds) == -1)
180			fatal("socketpair");
181
182			pa->pp_pipes[procs[proc].p_id][j] = fds[0];
183			pb->pp_pipes[src][i] = fds[1];
184			}
185			}
186			}
187			}
188
189			void
190			proc_listen(struct privsep ps, struct privsep_proc procs, size_t nproc)
191			{
192			unsigned int i, dst, src, n, m;
193			struct privsep_pipes *pp;
194
195			/*
196			* Close unused pipes
197			*/
198			for (src = 0; src < PROC_MAX; src++) {
199			for (n = 0; n < ps->ps_instances[src]; n++) {
200			/* Ingore current process */
201			if (src == (unsigned int)privsep_process &&
202			n == ps->ps_instance)
203			continue;
204
205			pp = &ps->ps_pipes[src][n];
206
207			for (dst = 0; dst < PROC_MAX; dst++) {
208			if (src == dst)
209			continue;
210			for (m = 0; m < ps->ps_instances[dst]; m++) {
211			if (pp->pp_pipes[dst][m] == -1)
212			continue;
213
214			/* Close and invalidate fd */
215			close(pp->pp_pipes[dst][m]);
216			pp->pp_pipes[dst][m] = -1;
217			}
218			}
219			}
220			}
221
222			src = privsep_process;
223			ps->ps_pp = pp = &ps->ps_pipes[src][ps->ps_instance];
224
225			/*
226			* Listen on appropriate pipes
227			*/
228			for (i = 0; i < nproc; i++) {
229			dst = procs[i].p_id;
230
231			if (src == dst)
232			fatal("proc_listen: cannot peer with oneself");
233
234			if ((ps->ps_ievs[dst] = calloc(ps->ps_instances[dst],
235			sizeof(struct imsgev))) == NULL)
236			fatal("proc_open");
237
238			for (n = 0; n < ps->ps_instances[dst]; n++) {
239			if (pp->pp_pipes[dst][n] == -1)
240			continue;
241
242			imsg_init(&(ps->ps_ievs[dst][n].ibuf),
243			pp->pp_pipes[dst][n]);
244			ps->ps_ievs[dst][n].handler = proc_dispatch;
245			ps->ps_ievs[dst][n].events = EV_READ;
246			ps->ps_ievs[dst][n].proc = &procs[i];
247			ps->ps_ievs[dst][n].data = &ps->ps_ievs[dst][n];
248			procs[i].p_instance = n;
249
250			event_set(&(ps->ps_ievs[dst][n].ev),
251			ps->ps_ievs[dst][n].ibuf.fd,
252			ps->ps_ievs[dst][n].events,
253			ps->ps_ievs[dst][n].handler,
254			ps->ps_ievs[dst][n].data);
255			event_add(&(ps->ps_ievs[dst][n].ev), NULL);
256			}
257			}
258			}
259
260			void
261			proc_close(struct privsep *ps)
262			{
263			unsigned int dst, n;
264			struct privsep_pipes *pp;
265
266			if (ps == NULL)
267			return;
268
269			pp = ps->ps_pp;
270
271			for (dst = 0; dst < PROC_MAX; dst++) {
272			if (ps->ps_ievs[dst] == NULL)
273			continue;
274
275			for (n = 0; n < ps->ps_instances[dst]; n++) {
276			if (pp->pp_pipes[dst][n] == -1)
277			continue;
278
279			/* Cancel the fd, close and invalidate the fd */
280			event_del(&(ps->ps_ievs[dst][n].ev));
281			imsg_clear(&(ps->ps_ievs[dst][n].ibuf));
282			close(pp->pp_pipes[dst][n]);
283			pp->pp_pipes[dst][n] = -1;
284			}
285			free(ps->ps_ievs[dst]);
286			}
287			}
288
289			void
290			proc_shutdown(struct privsep_proc *p)
291			{
292			struct privsep *ps = p->p_ps;
293
294			if (p->p_id == PROC_CONTROL && ps)
295			control_cleanup(&ps->ps_csock);
296
297			if (p->p_shutdown != NULL)
298			(*p->p_shutdown)();
299
300			proc_close(ps);
301
302			log_info("%s exiting, pid %d", p->p_title, getpid());
303
304			_exit(0);
305			}
306
307			void
308			proc_sig_handler(int sig, short event, void *arg)
309			{
310			struct privsep_proc *p = arg;
311
312			switch (sig) {
313			case SIGINT:
314			case SIGTERM:
315			proc_shutdown(p);
316			break;
317			case SIGCHLD:
318			case SIGHUP:
319			case SIGPIPE:
320			case SIGUSR1:
321			/* ignore */
322			break;
323			default:
324			fatalx("proc_sig_handler: unexpected signal");
325			/* NOTREACHED */
326			}
327			}
328
329			pid_t
330			proc_run(struct privsep ps, struct privsep_proc p,
331			struct privsep_proc *procs, unsigned int nproc,
332			void (run)(struct privsep , struct privsep_proc , void ), void *arg)
333			{
334			pid_t pid;
335			struct passwd *pw;
336			const char *root;
337			struct control_sock *rcs;
338			unsigned int n;
339
340			if (ps->ps_noaction)
341			return (0);
342
343			proc_open(ps, p, procs, nproc);
344
345			/* Fork child handlers */
346			switch (pid = fork()) {
347			case -1:
348			fatal("proc_run: cannot fork");
349			case 0:
350			log_procinit(p->p_title);
351
352			/* Set the process group of the current process */
353			setpgid(0, 0);
354			break;
355			default:
356			return (pid);
357			}
358
359			pw = ps->ps_pw;
360
361			if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) {
362			if (control_init(ps, &ps->ps_csock) == -1)
363			fatalx(__func__);
364			TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry)
365			if (control_init(ps, rcs) == -1)
366			fatalx(__func__);
367			}
368
369			/* Change root directory */
370			if (p->p_chroot != NULL)
371			root = p->p_chroot;
372			else
373			root = pw->pw_dir;
374
375			if (chroot(root) == -1)
376			fatal("proc_run: chroot");
377			if (chdir("/") == -1)
378			fatal("proc_run: chdir(\"/\")");
379
380			privsep_process = p->p_id;
381
382			setproctitle("%s", p->p_title);
383
384			if (setgroups(1, &pw->pw_gid) \|\|
385			setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) \|\|
386			setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid))
387			fatal("proc_run: cannot drop privileges");
388
389			/* Fork child handlers */
390			for (n = 1; n < ps->ps_instances[p->p_id]; n++) {
391			if (fork() == 0) {
392			ps->ps_instance = p->p_instance = n;
393			break;
394			}
395			}
396
397			#ifdef DEBUG
398			log_debug("%s: %s %d/%d, pid %d", __func__, p->p_title,
399			ps->ps_instance + 1, ps->ps_instances[p->p_id], getpid());
400			#endif
401
402			event_init();
403
404			signal_set(&ps->ps_evsigint, SIGINT, proc_sig_handler, p);
405			signal_set(&ps->ps_evsigterm, SIGTERM, proc_sig_handler, p);
406			signal_set(&ps->ps_evsigchld, SIGCHLD, proc_sig_handler, p);
407			signal_set(&ps->ps_evsighup, SIGHUP, proc_sig_handler, p);
408			signal_set(&ps->ps_evsigpipe, SIGPIPE, proc_sig_handler, p);
409			signal_set(&ps->ps_evsigusr1, SIGUSR1, proc_sig_handler, p);
410
411			signal_add(&ps->ps_evsigint, NULL);
412			signal_add(&ps->ps_evsigterm, NULL);
413			signal_add(&ps->ps_evsigchld, NULL);
414			signal_add(&ps->ps_evsighup, NULL);
415			signal_add(&ps->ps_evsigpipe, NULL);
416			signal_add(&ps->ps_evsigusr1, NULL);
417
418			proc_listen(ps, procs, nproc);
419
420			if (p->p_id == PROC_CONTROL && ps->ps_instance == 0) {
421			TAILQ_INIT(&ctl_conns);
422			if (control_listen(&ps->ps_csock) == -1)
423			fatalx(__func__);
424			TAILQ_FOREACH(rcs, &ps->ps_rcsocks, cs_entry)
425			if (control_listen(rcs) == -1)
426			fatalx(__func__);
427			}
428
429			if (run != NULL)
430			run(ps, p, arg);
431
432			event_dispatch();
433
434			proc_shutdown(p);
435
436			return (0);
437			}
438
439			void
440			proc_dispatch(int fd, short event, void *arg)
441			{
442			struct imsgev *iev = arg;
443			struct privsep_proc *p = iev->proc;
444			struct privsep *ps = p->p_ps;
445			struct imsgbuf *ibuf;
446			struct imsg imsg;
447			ssize_t n;
448			int verbose;
449			const char *title;
450
451			title = ps->ps_title[privsep_process];
452			ibuf = &iev->ibuf;
453
454			if (event & EV_READ) {
455			if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
456			fatal(__func__);
457			if (n == 0) {
458			/* this pipe is dead, so remove the event handler */
459			event_del(&iev->ev);
460			event_loopexit(NULL);
461			return;
462			}
463			}
464
465			if (event & EV_WRITE) {
466			if (msgbuf_write(&ibuf->w) <= 0 && errno != EAGAIN)
467			fatal(__func__);
468			}
469
470			for (;;) {
471			if ((n = imsg_get(ibuf, &imsg)) == -1)
472			fatal(__func__);
473			if (n == 0)
474			break;
475
476			#if DEBUG > 1
477			log_debug("%s: %s %d got imsg %d peerid %d from %s %d",
478			__func__, title, ps->ps_instance + 1,
479			imsg.hdr.type, imsg.hdr.peerid, p->p_title, p->p_instance);
480			#endif
481
482			/*
483			* Check the message with the program callback
484			*/
485			if ((p->p_cb)(fd, p, &imsg) == 0) {
486			/* Message was handled by the callback, continue */
487			imsg_free(&imsg);
488			continue;
489			}
490
491			/*
492			* Generic message handling
493			*/
494			switch (imsg.hdr.type) {
495			case IMSG_CTL_VERBOSE:
496			IMSG_SIZE_CHECK(&imsg, &verbose);
497			memcpy(&verbose, imsg.data, sizeof(verbose));
498			log_verbose(verbose);
499			break;
500			default:
501			log_warnx("%s: %s %d got invalid imsg %d peerid %d "
502			"from %s %d",
503			__func__, title, ps->ps_instance + 1,
504			imsg.hdr.type, imsg.hdr.peerid,
505			p->p_title, p->p_instance);
506			fatalx(__func__);
507			}
508			imsg_free(&imsg);
509			}
510			imsg_event_add(iev);
511			}
512
513			int
514			proc_dispatch_null(int fd, struct privsep_proc p, struct imsg imsg)
515			{
516			return (-1);
517			}
518
519			/*
520			* imsg helper functions
521			*/
522
523			void
524			imsg_event_add(struct imsgev *iev)
525			{
526			if (iev->handler == NULL) {
527			imsg_flush(&iev->ibuf);
528			return;
529			}
530
531			iev->events = EV_READ;
532			if (iev->ibuf.w.queued)
533			iev->events \|= EV_WRITE;
534
535			event_del(&iev->ev);
536			event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev->data);
537			event_add(&iev->ev, NULL);
538			}
539
540			int
541			imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
542			pid_t pid, int fd, void *data, uint16_t datalen)
543			{
544			int ret;
545
546			if ((ret = imsg_compose(&iev->ibuf, type, peerid,
547			pid, fd, data, datalen)) == -1)
548			return (ret);
549			imsg_event_add(iev);
550			return (ret);
551			}
552
553			int
554			imsg_composev_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
555			pid_t pid, int fd, const struct iovec *iov, int iovcnt)
556			{
557			int ret;
558
559			if ((ret = imsg_composev(&iev->ibuf, type, peerid,
560			pid, fd, iov, iovcnt)) == -1)
561			return (ret);
562			imsg_event_add(iev);
563			return (ret);
564			}
565
566			void
567			proc_range(struct privsep ps, enum privsep_procid id, int n, int *m)
568			{
569			if (*n == -1) {
570			/* Use a range of all target instances */
571			*n = 0;
572			*m = ps->ps_instances[id];
573			} else {
574			/* Use only a single slot of the specified peer process */
575			m = n + 1;
576			}
577			}
578
579			int
580			proc_compose_imsg(struct privsep *ps, enum privsep_procid id, int n,
581			uint16_t type, uint32_t peerid, int fd, void *data, uint16_t datalen)
582			{
583			int m;
584
585			proc_range(ps, id, &n, &m);
586			for (; n < m; n++) {
587			if (imsg_compose_event(&ps->ps_ievs[id][n],
588			type, peerid, 0, fd, data, datalen) == -1)
589			return (-1);
590			}
591
592			return (0);
593			}
594
595			int
596			proc_compose(struct privsep *ps, enum privsep_procid id,
597			uint16_t type, void *data, uint16_t datalen)
598			{
599			return (proc_compose_imsg(ps, id, -1, type, -1, -1, data, datalen));
600			}
601
602			int
603			proc_composev_imsg(struct privsep *ps, enum privsep_procid id, int n,
604			uint16_t type, uint32_t peerid, int fd, const struct iovec *iov, int iovcnt)
605			{
606			int m;
607
608			proc_range(ps, id, &n, &m);
609			for (; n < m; n++)
610			if (imsg_composev_event(&ps->ps_ievs[id][n],
611			type, peerid, 0, fd, iov, iovcnt) == -1)
612			return (-1);
613
614			return (0);
615			}
616
617			int
618			proc_composev(struct privsep *ps, enum privsep_procid id,
619			uint16_t type, const struct iovec *iov, int iovcnt)
620			{
621			return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt));
622			}
623
624			int
625			proc_forward_imsg(struct privsep ps, struct imsg imsg,
626			enum privsep_procid id, int n)
627			{
628			return (proc_compose_imsg(ps, id, n, imsg->hdr.type,
629			imsg->hdr.peerid, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg)));
630			}
631
632			struct imsgbuf *
633			proc_ibuf(struct privsep *ps, enum privsep_procid id, int n)
634			{
635			int m;
636
637			proc_range(ps, id, &n, &m);
638			return (&ps->ps_ievs[id][n].ibuf);
639			}
640
641			struct imsgev *
642			proc_iev(struct privsep *ps, enum privsep_procid id, int n)
643			{
644			int m;
645
646			proc_range(ps, id, &n, &m);
647			return (&ps->ps_ievs[id][n]);
648			}