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installboot(8): Adjustments for EFI platforms

Reduce #ifdef'ing within the control logic to make it clearer that there
are no essential differences in behaviour between the platforms.

Make installboot(8) write startup.nsh to enable simpler and more consistent
code in install.md.

Input and OK kettenis@ deraadt@

/*	$OpenBSD: util.c,v 1.16 2022/02/03 10:25:14 visa Exp $	*/

/*
 * Copyright (c) 2014 Joel Sing <jsing@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/stat.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <libgen.h>

#include "installboot.h"

#define MINIMUM(a, b)	(((a) < (b)) ? (a) : (b))

#define BUFSIZE 512

int
filecopy(const char *srcfile, const char *dstfile)
{
	struct stat sb;
	ssize_t sz, n;
	int sfd, dfd;
	char *buf;

	sfd = open(srcfile, O_RDONLY);
	if (sfd == -1) {
		warn("open %s", srcfile);
		return (-1);
	}
	if (fstat(sfd, &sb) == -1) {
		warn("fstat");
		return (-1);
	}
	sz = sb.st_size;

	dfd = open(dstfile, O_WRONLY|O_CREAT, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
	if (dfd == -1) {
		warn("open %s", dstfile);
		return (-1);
	}
	if (fchown(dfd, 0, 0) == -1)
		if (errno != EINVAL) {
			warn("chown");
			return (-1);
		}
	if (fchmod(dfd, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) == -1) {
		warn("chmod");
		return (-1);
	}

	if ((buf = malloc(BUFSIZE)) == NULL) {
		warn("malloc");
		return (-1);
	}

	while (sz > 0) {
		n = MINIMUM(sz, BUFSIZE);
		if ((n = read(sfd, buf, n)) == -1) {
			warn("read");
			free(buf);
			return (-1);
		}
		sz -= n;
		if (write(dfd, buf, n) != n) {
			warn("write");
			free(buf);
			return (-1);
		}
	}

	ftruncate(dfd, sb.st_size);

	close(dfd);
	close(sfd);
	free(buf);

	return (0);
}

char *
fileprefix(const char *base, const char *path)
{
	char *r = NULL, *d, *b, *s;
	int n;

	if ((s = malloc(PATH_MAX)) == NULL) {
		warn("malloc");
		return (NULL);
	}
	n = snprintf(s, PATH_MAX, "%s/%s", base, path);
	if (n < 0 || n >= PATH_MAX) {
		warn("snprintf");
		goto err;
	}
	if ((d = dirname(s)) == NULL) {
		warn("dirname");
		goto err;
	}
	if ((r = realpath(d, NULL)) == NULL) {
		warn("realpath");
		goto err;
	}
	if ((b = basename(s)) == NULL) {
		warn("basename");
		goto err;
	}
	n = snprintf(s, PATH_MAX, "%s/%s", r, b);
	if (n < 0 || n >= PATH_MAX) {
		warn("snprintf");
		goto err;
	}
	free(r);
	return (s);

err:
	free(s);
	free(r);
	return (NULL);
}

int
fileprintf(const char *filename, const char *fmt, ...)
{
	va_list ap;
	int fd, ret;
	int rslt = -1;

	fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC,
	    S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
	if (fd == -1) {
		warn("open %s", filename);
		return (-1);
	}
	if (fchown(fd, 0, 0) == -1) {
		if (errno != EINVAL) {
			warn("chown");
			goto err;
		}
	}
	if (fchmod(fd, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) == -1) {
		warn("chmod");
		goto err;
	}

	va_start(ap, fmt);
	ret = vdprintf(fd, fmt, ap);
	va_end(ap);

	if (ret < 0) {
		warn("vdprintf");
		goto err;
	}

	rslt = 0;

err:
	close(fd);
	return (rslt);
}

/*
 * Adapted from Hacker's Delight crc32b().
 *
 * To quote http://www.hackersdelight.org/permissions.htm :
 *
 * "You are free to use, copy, and distribute any of the code on
 *  this web site, whether modified by you or not. You need not give
 *  attribution. This includes the algorithms (some of which appear
 *  in Hacker's Delight), the Hacker's Assistant, and any code submitted
 *  by readers. Submitters implicitly agree to this."
 */
u_int32_t
crc32(const u_char *buf, const u_int32_t size)
{
	int j;
	u_int32_t i, byte, crc, mask;

	crc = 0xFFFFFFFF;

	for (i = 0; i < size; i++) {
		byte = buf[i];			/* Get next byte. */
		crc = crc ^ byte;
		for (j = 7; j >= 0; j--) {	/* Do eight times. */
			mask = -(crc & 1);
			crc = (crc >> 1) ^ (0xEDB88320 & mask);
		}
	}

	return ~crc;
}