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add unveil(2) to mixerctl(1)

after we know what is the mixer device to be used, either through MIXERDEVICE
env var, the argument passed or by default /dev/mixer then we can unveil it in
read/write mode, then if opening fails we reduce unveil to only read mode.

Once open(2) succeeds then we can disable fs access by calling unveil(NULL, NULL)
since all further operations occur on fds.

A cleaner solution would be to just call pledge("audio") after open(2) but
currently the ioctls used are not whitelisted in pledge(2), ratchov@ will
investigate a better way to do this

OK ratchov@

/*	$OpenBSD: mixerctl.c,v 1.31 2018/08/08 19:35:47 mestre Exp $	*/
/*	$NetBSD: mixerctl.c,v 1.11 1998/04/27 16:55:23 augustss Exp $	*/

/*
 * Copyright (c) 1997 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * Author: Lennart Augustsson, with some code and ideas from Chuck Cranor.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * mixerctl(1) - a program to control audio mixing.
 */

#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/audioio.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

struct field *findfield(char *);
void adjlevel(char **, u_char *, int);
void catstr(char *, char *, char *);
void prfield(struct field *, char *, int, mixer_ctrl_t *);
void rdfield(int, struct field *, char *, int, char *);
__dead void usage(void);

#define FIELD_NAME_MAX	64

struct field {
	char name[FIELD_NAME_MAX];
	mixer_ctrl_t *valp;
	mixer_devinfo_t *infp;
} *fields, *rfields;

mixer_ctrl_t *values;
mixer_devinfo_t *infos;

void
catstr(char *p, char *q, char *out)
{
	char tmp[FIELD_NAME_MAX];

	snprintf(tmp, FIELD_NAME_MAX, "%s.%s", p, q);
	strlcpy(out, tmp, FIELD_NAME_MAX);
}

struct field *
findfield(char *name)
{
	int i;
	for (i = 0; fields[i].name[0] != '\0'; i++)
		if (strcmp(fields[i].name, name) == 0)
			return &fields[i];
	return (0);
}

#define e_member_name	un.e.member[i].label.name
#define s_member_name	un.s.member[i].label.name

void
prfield(struct field *p, char *sep, int prvalset, mixer_ctrl_t *m)
{
	int i, n;

	if (sep)
		printf("%s%s", p->name, sep);
	switch (m->type) {
	case AUDIO_MIXER_ENUM:
		for (i = 0; i < p->infp->un.e.num_mem; i++)
			if (p->infp->un.e.member[i].ord == m->un.ord)
				printf("%s",
					p->infp->e_member_name);
		if (prvalset) {
			printf("  [ ");
			for (i = 0; i < p->infp->un.e.num_mem; i++)
				printf("%s ", p->infp->e_member_name);
			printf("]");
		}
		break;
	case AUDIO_MIXER_SET:
		for (n = i = 0; i < p->infp->un.s.num_mem; i++)
			if (m->un.mask & p->infp->un.s.member[i].mask)
				printf("%s%s", n++ ? "," : "",
						p->infp->s_member_name);
		if (prvalset) {
			printf("  { ");
			for (i = 0; i < p->infp->un.s.num_mem; i++)
				printf("%s ", p->infp->s_member_name);
			printf("}");
		}
		break;
	case AUDIO_MIXER_VALUE:
		if (m->un.value.num_channels == 1)
			printf("%d", m->un.value.level[0]);
		else
			printf("%d,%d", m->un.value.level[0],
			    m->un.value.level[1]);
		if (prvalset)
			printf(" %s", p->infp->un.v.units.name);
		break;
	default:
		errx(1, "Invalid format.");
	}
}

void
adjlevel(char **p, u_char *olevel, int more)
{
	char *ep, *cp = *p;
	long inc;
	u_char level;

	if (*cp != '+' && *cp != '-')
		*olevel = 0;		/* absolute setting */

	errno = 0;
	inc = strtol(cp, &ep, 10);
	if (*cp == '\0' || (*ep != '\0' && *ep != ',') ||
	    (errno == ERANGE && (inc == LONG_MAX || inc == LONG_MIN)))
		errx(1, "Bad number %s", cp);
	if (*ep == ',' && !more)
		errx(1, "Too many values");
	*p = ep;

	if (inc < AUDIO_MIN_GAIN - *olevel)
		level = AUDIO_MIN_GAIN;
	else if (inc > AUDIO_MAX_GAIN - *olevel)
		level = AUDIO_MAX_GAIN;
	else
		level = *olevel + inc;
	*olevel = level;
}

void
rdfield(int fd, struct field *p, char *q, int quiet, char *sep)
{
	mixer_ctrl_t *m, oldval;
	int i, mask;
	char *s;

	oldval = *p->valp;
	m = p->valp;

	switch (m->type) {
	case AUDIO_MIXER_ENUM:
		if (strcmp(q, "toggle") == 0) {
			for (i = 0; i < p->infp->un.e.num_mem; i++) {
				if (m->un.ord == p->infp->un.e.member[i].ord)
					break;
			}
			if (i < p->infp->un.e.num_mem)
				i++;
			else
				i = 0;
			m->un.ord = p->infp->un.e.member[i].ord;
			break;
		}
		for (i = 0; i < p->infp->un.e.num_mem; i++)
			if (strcmp(p->infp->e_member_name, q) == 0)
				break;
		if (i < p->infp->un.e.num_mem)
			m->un.ord = p->infp->un.e.member[i].ord;
		else
			errx(1, "Bad enum value %s", q);
		break;
	case AUDIO_MIXER_SET:
		mask = 0;
		for (; q && *q; q = s) {
			if ((s = strchr(q, ',')) != NULL)
				*s++ = 0;
			for (i = 0; i < p->infp->un.s.num_mem; i++)
				if (strcmp(p->infp->s_member_name, q) == 0)
					break;
			if (i < p->infp->un.s.num_mem)
				mask |= p->infp->un.s.member[i].mask;
			else
				errx(1, "Bad set value %s", q);
		}
		m->un.mask = mask;
		break;
	case AUDIO_MIXER_VALUE:
		if (m->un.value.num_channels == 1) {
			adjlevel(&q, &m->un.value.level[0], 0);
		} else {
			adjlevel(&q, &m->un.value.level[0], 1);
			if (*q++ == ',')
				adjlevel(&q, &m->un.value.level[1], 0);
			else
				m->un.value.level[1] = m->un.value.level[0];
		}
		break;
	default:
		errx(1, "Invalid format.");
	}

	if (ioctl(fd, AUDIO_MIXER_WRITE, p->valp) < 0) {
		warn("AUDIO_MIXER_WRITE");
	} else if (!quiet) {
		if (ioctl(fd, AUDIO_MIXER_READ, p->valp) < 0) {
			warn("AUDIO_MIXER_READ");
		} else {
			if (sep) {
				prfield(p, ": ", 0, &oldval);
				printf(" -> ");
			}
			prfield(p, NULL, 0, p->valp);
			printf("\n");
		}
	}
}

int
main(int argc, char **argv)
{
	int fd, i, j, ch, pos;
	int aflag = 0, qflag = 0, vflag = 0, tflag = 0;
	char *file;
	char *sep = "=";
	mixer_devinfo_t dinfo;
	int ndev;

	if ((file = getenv("MIXERDEVICE")) == 0 || *file == '\0')
		file = "/dev/mixer";

	while ((ch = getopt(argc, argv, "af:nqtvw")) != -1) {
		switch (ch) {
		case 'a':
			aflag = 1;
			break;
		case 'w':
			/* compat */
			break;
		case 'v':
			vflag = 1;
			break;
		case 'n':
			sep = 0;
			break;
		case 'f':
			file = optarg;
			break;
		case 'q':
			qflag = 1;
			break;
		case 't':
			tflag = 1;
			break;
		default:
			usage();
		}
	}
	argc -= optind;
	argv += optind;

	if (argc == 0 && tflag == 0)
		aflag = 1;

	if (unveil(file, "rw") == -1)
		err(1, "unveil");

	if ((fd = open(file, O_RDWR)) == -1) {
		if (unveil(file, "r") == -1)
			err(1, "unveil");

		if ((fd = open(file, O_RDONLY)) == -1)
			err(1, "%s", file);
	}

	if (unveil(NULL, NULL) == -1)
		err(1, "unveil");

	for (ndev = 0; ; ndev++) {
		dinfo.index = ndev;
		if (ioctl(fd, AUDIO_MIXER_DEVINFO, &dinfo) < 0)
			break;
	}

	if (!ndev)
		errx(1, "no mixer devices configured");

	if ((rfields = calloc(ndev, sizeof *rfields)) == NULL ||
	    (fields = calloc(ndev, sizeof *fields)) == NULL ||
	    (infos = calloc(ndev, sizeof *infos)) == NULL ||
	    (values = calloc(ndev, sizeof *values)) == NULL)
		err(1, "calloc()");

	for (i = 0; i < ndev; i++) {
		infos[i].index = i;
		if (ioctl(fd, AUDIO_MIXER_DEVINFO, &infos[i]) < 0) {
			ndev--;
			i--;
			continue;
		}
	}

	for (i = 0; i < ndev; i++) {
		strlcpy(rfields[i].name, infos[i].label.name, FIELD_NAME_MAX);
		rfields[i].valp = &values[i];
		rfields[i].infp = &infos[i];
	}

	for (i = 0; i < ndev; i++) {
		values[i].dev = i;
		values[i].type = infos[i].type;
		if (infos[i].type != AUDIO_MIXER_CLASS) {
			values[i].un.value.num_channels = 2;
			if (ioctl(fd, AUDIO_MIXER_READ, &values[i]) < 0) {
				values[i].un.value.num_channels = 1;
				if (ioctl(fd, AUDIO_MIXER_READ, &values[i]) < 0)
					err(1, "AUDIO_MIXER_READ");
			}
		}
	}

	for (j = i = 0; i < ndev; i++) {
		if (infos[i].type != AUDIO_MIXER_CLASS &&
		    infos[i].prev == AUDIO_MIXER_LAST) {
			fields[j++] = rfields[i];
			for (pos = infos[i].next; pos != AUDIO_MIXER_LAST;
			    pos = infos[pos].next) {
				fields[j] = rfields[pos];
				catstr(rfields[i].name, infos[pos].label.name,
				    fields[j].name);
				j++;
			}
		}
	}

	for (i = 0; i < j; i++) {
		int cls = fields[i].infp->mixer_class;
		if (cls >= 0 && cls < ndev)
			catstr(infos[cls].label.name, fields[i].name,
			    fields[i].name);
	}

	if (!argc && aflag) {
		for (i = 0; fields[i].name[0] != '\0'; i++) {
			prfield(&fields[i], sep, vflag, fields[i].valp);
			printf("\n");
		}
	} else if (argc > 0 && !aflag) {
		struct field *p;

		while (argc--) {
			char *q;

			ch = 0;
			if ((q = strchr(*argv, '=')) != NULL) {
				*q++ = '\0';
				ch = 1;
			}

			if ((p = findfield(*argv)) == NULL) {
				warnx("field %s does not exist", *argv);
			} else if (ch || tflag) {
				if (tflag && q == NULL)
					q = "toggle";
				rdfield(fd, p, q, qflag, sep);
			} else {
				prfield(p, sep, vflag, p->valp);
				printf("\n");
			}

			argv++;
		}
	} else
		usage();
	exit(0);
}

__dead void
usage(void)
{
	extern char *__progname;	/* from crt0.o */

	fprintf(stderr,
	    "usage: %s [-anv] [-f file]\n"
	    "       %s [-nv] [-f file] name ...\n"
	    "       %s [-qt] [-f file] name ...\n"
	    "       %s [-q] [-f file] name=value ...\n",
	    __progname, __progname, __progname, __progname);

	exit(1);
}