assimilate nvmutil

1 files changed, 319 insertions, 0 deletions

diff --git a/util/nvmutil/nvmutil.c b/util/nvmutil/nvmutil.c
new file mode 100644
index 00000000..9f93ae59
--- /dev/null
+++ b/util/nvmutil/nvmutil.c
@@ -0,0 +1,319 @@
+/* 
+ * Copyright (C) 2022 Leah Rowe <info@minifree.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+#include <dirent.h>
+#ifdef HAVE_PLEDGE
+#include <err.h>
+#endif
+
+ssize_t readFromFile(int *fd, uint8_t *buf, const char *path, int flags,
+	size_t size);
+void setmac(const char *strMac);
+void cmd(const char *command);
+int validChecksum(int partnum);
+uint16_t word(int pos16, int partnum);
+void setWord(int pos16, int partnum, uint16_t val);
+void byteswap(uint8_t *byte);
+
+#define FILENAME argv[1]
+#define COMMAND argv[2]
+#define MAC_ADDRESS argv[3]
+#define PARTNUM argv[3]
+#define SIZE_4KB 0x1000
+#define SIZE_8KB 0x2000
+
+uint8_t gbe[SIZE_8KB];
+int part, modified = 0;
+
+uint16_t test;
+uint8_t little_endian;
+
+int
+main(int argc, char *argv[])
+{
+	int fd;
+	int flags = O_RDWR;
+	char *strMac = NULL;
+	char *strRMac = "??:??:??:??:??:??";
+
+	test = 1;
+	little_endian = ((uint8_t *) &test)[0];
+
+#ifdef HAVE_PLEDGE
+	if (pledge("stdio wpath", NULL) == -1)
+		err(1, "pledge");
+#endif
+	if (argc == 3) {
+		if (strcmp(COMMAND, "dump") == 0) {
+#ifdef HAVE_PLEDGE
+			if (pledge("stdio rpath", NULL) == -1)
+				err(1, "pledge");
+#endif
+			flags = O_RDONLY;
+		} else if (strcmp(COMMAND, "setmac") == 0) {
+			strMac = strRMac;
+		}
+	} else if (argc == 4) {
+		if (strcmp(COMMAND, "setmac") == 0)
+			strMac = MAC_ADDRESS;
+		else if ((!((part = PARTNUM[0] - '0') == 0 || part == 1))
+				|| PARTNUM[1])
+			errno = EINVAL;
+	} else
+		errno = EINVAL;
+
+	if (errno != 0)
+		goto nvmutil_exit;
+
+	if (readFromFile(&fd, gbe, FILENAME, flags, SIZE_8KB)
+		== SIZE_8KB)
+	{
+		if (strMac != NULL)
+			setmac(strMac);
+		else
+			cmd(COMMAND);
+
+		if (modified) {
+			errno = 0;
+			if (pwrite(fd, gbe, SIZE_8KB, 0) == SIZE_8KB)
+				close(fd);
+		}
+	}
+
+nvmutil_exit:
+	if (errno == ENOTDIR)
+		errno = 0;
+	if (!((errno == ECANCELED) && (flags == O_RDONLY)))
+		if (errno != 0)
+			fprintf(stderr, "%s\n", strerror(errno));
+	return errno;
+}
+
+ssize_t
+readFromFile(int *fd, uint8_t *buf, const char *path, int flags, size_t size)
+{
+	struct stat st;
+
+	if (opendir(path) != NULL) {
+		errno = EISDIR;
+		return -1;
+	} else if (((*fd) = open(path, flags)) == -1) {
+		return -1;
+	} else if (size == SIZE_8KB) {
+		fstat((*fd), &st);
+		if (st.st_size != SIZE_8KB) {
+			fprintf(stderr, "Bad file size\n");
+			errno = ECANCELED;
+			return -1;
+		}
+	}
+	return read((*fd), buf, size);
+}
+
+void
+setmac(const char *strMac)
+{
+	uint8_t rmac[12];
+	uint8_t o, ch, val8;
+	uint16_t val16;
+	int macfd, partnum, random, byte, nib;
+	uint16_t mac[3] = {0, 0, 0};
+	uint64_t total = 0;
+
+	if (readFromFile(&macfd, rmac, "/dev/urandom", O_RDONLY, 12) != 12)
+		return;
+	else if (strnlen(strMac, 20) != 17)
+		goto invalid_mac_address;
+	for (o = 0, random = 0; o < 16; o += 3) {
+		if (o != 15)
+			if (strMac[o + 2] != ':')
+				goto invalid_mac_address;
+		byte = o / 3;
+		for (nib = 0; nib < 2; nib++, total += val8) {
+			ch = strMac[o + nib];
+			if ((ch >= '0') && ch <= '9') {
+				val8 = ch - '0';
+			} else if ((ch >= 'A') && (ch <= 'F')) {
+				val8 = ch - 'A' + 10;
+			} else if ((ch >= 'a') && (ch <= 'f')) {
+				val8 = ch - 'a' + 10;
+			} else if (ch == '?') {
+				val8 = rmac[random++] & 0xf;
+				if ((byte == 0 && (nib == 1))) {
+					val8 &= 0xE;
+					val8 |= 2;
+				}
+			} else {
+				goto invalid_mac_address;
+			}
+			val16 = val8;
+			if ((byte % 2) ^ 1)
+				byteswap((uint8_t *) &val16);
+			val16 <<= 4 * (nib ^ 1);
+			mac[byte >> 1] |= val16;
+		}
+	}
+
+	test = mac[0];
+	if (little_endian)
+		byteswap((uint8_t *) &test);
+	if (total == 0 || (((uint8_t *) &test)[0] & 1))
+		goto invalid_mac_address;
+
+	if (little_endian)
+		for (o = 0; o < 3; o++)
+			byteswap((uint8_t *) &mac[o]);
+
+	for (partnum = 0; partnum < 2; partnum++) {
+		if (validChecksum(partnum)) {
+			for (o = 0; o < 3; o++)
+				setWord(o, partnum, mac[o]);
+			part = partnum;
+			cmd("setchecksum");
+		}
+	}
+	return;
+invalid_mac_address:
+	fprintf(stderr, "Bad MAC address\n");
+	errno = ECANCELED;
+	return;
+}
+
+void
+cmd(const char *command)
+{
+	int c, partnum, part0, part1, row, numInvalid;
+	uint8_t *byte;
+	uint16_t val16;
+
+	if (strcmp(command, "dump") == 0) {
+		numInvalid = 0;
+		for (partnum = 0; partnum < 2; partnum++) {
+			if (!validChecksum(partnum))
+				++numInvalid;
+
+			printf("Part %d:\n", partnum);
+
+			printf("MAC: ");
+			for (c = 0; c < 3; c++) {
+				val16 = word(c, partnum);
+				byte = (uint8_t *) &val16;
+				if (!little_endian)
+					byteswap(byte);
+				printf("%02x:%02x", byte[0], byte[1]);
+				if (c == 2)
+					printf("\n");
+				else
+					printf(":");
+			}
+
+			for (row = 0; row < 8; row++) {
+				printf("%07x ", row << 4);
+				for (c = 0; c < 8; c++) {
+					val16 = word((row << 3) + c, partnum);
+					byte = (uint8_t *) &val16;
+					if (!little_endian)
+						byteswap(byte);
+					printf("%02x%02x ", byte[1], byte[0]);
+				}
+				printf("\n");
+			}
+		}
+		if (numInvalid < 2) {
+			errno = 0;
+		}
+	} else if (strcmp(command, "setchecksum") == 0) {
+		val16 = 0;
+		for (c = 0; c < 0x3F; c++)
+			val16 += word(c, part);
+		setWord(0x3F, part, 0xBABA - val16);
+	} else if (strcmp(command, "brick") == 0) {
+		if (validChecksum(part))
+			setWord(0x3F, part, (word(0x3F, part)) ^ 0xFF);
+	} else if (strcmp(command, "swap") == 0) {
+		part0 = validChecksum(0);
+		part1 = validChecksum(1);
+		if ((modified = (part0 | part1))) {
+			for(part0 = 0; part0 < SIZE_4KB; part0++) {
+				gbe[part0] ^= gbe[part1 = (part0 | SIZE_4KB)];
+				gbe[part1] ^= gbe[part0];
+				gbe[part0] ^= gbe[part1];
+			}
+		}
+	} else if (strcmp(command, "copy") == 0) {
+		if (validChecksum(part))
+			memcpy(gbe + ((part ^ (modified = 1)) << 12),
+				gbe + (part << 12), SIZE_4KB);
+	} else
+		errno = EINVAL;
+}
+
+int
+validChecksum(int partnum)
+{
+	int w;
+	uint16_t total = 0;
+
+	for(w = 0; w <= 0x3F; w++)
+		total += word(w, partnum);
+
+	if (total != 0xBABA) {
+		fprintf(stderr, "BAD checksum in part %d\n", partnum);
+		errno = ECANCELED;
+		return 0;
+	}
+	return 1;
+}
+
+uint16_t
+word(int pos16, int partnum)
+{
+	uint16_t val16 = ((uint16_t *) gbe)[pos16 + (partnum << 11)];
+	if (!little_endian)
+		byteswap((uint8_t *) &val16);
+	return val16;
+}
+
+void
+setWord(int pos16, int partnum, uint16_t val)
+{
+	((uint16_t *) gbe)[pos16 + (partnum << 11)] = val;
+	if (!little_endian)
+		byteswap(gbe + (pos16 << 1) + (partnum << 12));
+	modified = 1;
+}
+
+void
+byteswap(uint8_t *byte) {
+	byte[0] ^= byte[1];
+	byte[1] ^= byte[0];
+	byte[0] ^= byte[1];
+}