migrate fully to meson build system

- drop old build system
- move shared include and source files to common directory
- drop "rc-" prefix from shared include and source files
- move executable-specific code to individual directories under src
- adjust top-level .gitignore file for new build system

This closes #489.

1 files changed, 0 insertions, 522 deletions

diff --git a/src/rc/seedrng.c b/src/rc/seedrng.c
deleted file mode 100644
index 95fb947d..00000000
--- a/src/rc/seedrng.c
+++ /dev/null
@@ -1,522 +0,0 @@
-/*
- * seedrng.c
- * Seed kernel RNG from seed file, based on code from:
- * https://git.zx2c4.com/seedrng/about/
- */
-
-/*
- * Copyright (c) 2022 The OpenRC Authors.
- * See the Authors file at the top-level directory of this distribution and
- * https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS
- *
- * This file is part of OpenRC. It is subject to the license terms in
- * the LICENSE file found in the top-level directory of this
- * distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE
- * This file may not be copied, modified, propagated, or distributed
- *    except according to the terms contained in the LICENSE file.
- */
-
-#include <linux/random.h>
-#include <sys/random.h>
-#include <sys/ioctl.h>
-#include <sys/file.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <fcntl.h>
-#include <getopt.h>
-#include <poll.h>
-#include <unistd.h>
-#include <time.h>
-#include <errno.h>
-#include <endian.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "rc.h"
-#include "einfo.h"
-#include "helpers.h"
-#include "_usage.h"
-
-#ifndef GRND_INSECURE
-#define GRND_INSECURE 0x0004 /* Apparently some headers don't ship with this yet. */
-#endif
-
-/* Use long option value that is out of range for 8 bit getopt values.
- * The exact enum value is internal and can freely change, so we keep the
- * options sorted.
- */
-enum long_opts {
-  /* This has to come first so following values stay in the 0x100+ range. */
-  LONGOPT_BASE = 0x100,
-  LONGOPT_LOCK_FILE,
-  LONGOPT_SEED_DIR,
-  LONGOPT_SKIP_CREDIT,
-};
-
-const char *applet = NULL;
-const char *extraopts =NULL;
-const char getoptstring[] = getoptstring_COMMON;
-const struct option longopts[] = {
-	{ "lock-file", 1, NULL, LONGOPT_LOCK_FILE },
-	{ "seed-dir", 1, NULL, LONGOPT_SEED_DIR },
-	{ "skip-credit", 0, NULL, LONGOPT_SKIP_CREDIT },
-	longopts_COMMON
-};
-const char * const longopts_help[] = {
-	"lock file",
-	"directory for seed files",
-	"skip credit",
-	longopts_help_COMMON
-};
-const char *usagestring = NULL;
-
-static char *lock_file = NULL;
-static char *seed_dir = NULL;
-static char *creditable_seed = NULL;
-static char *non_creditable_seed = NULL;
-
-enum blake2s_lengths {
-	BLAKE2S_BLOCK_LEN = 64,
-	BLAKE2S_HASH_LEN = 32,
-	BLAKE2S_KEY_LEN = 32
-};
-
-enum seedrng_lengths {
-	MAX_SEED_LEN = 512,
-	MIN_SEED_LEN = BLAKE2S_HASH_LEN
-};
-
-struct blake2s_state {
-	uint32_t h[8];
-	uint32_t t[2];
-	uint32_t f[2];
-	uint8_t buf[BLAKE2S_BLOCK_LEN];
-	unsigned int buflen;
-	unsigned int outlen;
-};
-
-#define le32_to_cpup(a) le32toh(*(a))
-#define cpu_to_le32(a) htole32(a)
-#ifndef ARRAY_SIZE
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
-#endif
-#ifndef DIV_ROUND_UP
-#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
-#endif
-
-static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words)
-{
-        while (words--) {
-		*buf = cpu_to_le32(*buf);
-		++buf;
-	}
-}
-
-static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words)
-{
-        while (words--) {
-		*buf = le32_to_cpup(buf);
-		++buf;
-        }
-}
-
-static inline uint32_t ror32(uint32_t word, unsigned int shift)
-{
-	return (word >> (shift & 31)) | (word << ((-shift) & 31));
-}
-
-static const uint32_t blake2s_iv[8] = {
-	0x6A09E667UL, 0xBB67AE85UL, 0x3C6EF372UL, 0xA54FF53AUL,
-	0x510E527FUL, 0x9B05688CUL, 0x1F83D9ABUL, 0x5BE0CD19UL
-};
-
-static const uint8_t blake2s_sigma[10][16] = {
-	{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
-	{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
-	{ 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
-	{ 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
-	{ 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
-	{ 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 },
-	{ 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 },
-	{ 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 },
-	{ 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 },
-	{ 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },
-};
-
-static void blake2s_set_lastblock(struct blake2s_state *state)
-{
-	state->f[0] = -1;
-}
-
-static void blake2s_increment_counter(struct blake2s_state *state, const uint32_t inc)
-{
-	state->t[0] += inc;
-	state->t[1] += (state->t[0] < inc);
-}
-
-static void blake2s_init_param(struct blake2s_state *state, const uint32_t param)
-{
-	int i;
-
-	memset(state, 0, sizeof(*state));
-	for (i = 0; i < 8; ++i)
-		state->h[i] = blake2s_iv[i];
-	state->h[0] ^= param;
-}
-
-static void blake2s_init(struct blake2s_state *state, const size_t outlen)
-{
-	blake2s_init_param(state, 0x01010000 | outlen);
-	state->outlen = outlen;
-}
-
-static void blake2s_compress(struct blake2s_state *state, const uint8_t *block, size_t nblocks, const uint32_t inc)
-{
-	uint32_t m[16];
-	uint32_t v[16];
-	int i;
-
-	while (nblocks > 0) {
-		blake2s_increment_counter(state, inc);
-		memcpy(m, block, BLAKE2S_BLOCK_LEN);
-		le32_to_cpu_array(m, ARRAY_SIZE(m));
-		memcpy(v, state->h, 32);
-		v[ 8] = blake2s_iv[0];
-		v[ 9] = blake2s_iv[1];
-		v[10] = blake2s_iv[2];
-		v[11] = blake2s_iv[3];
-		v[12] = blake2s_iv[4] ^ state->t[0];
-		v[13] = blake2s_iv[5] ^ state->t[1];
-		v[14] = blake2s_iv[6] ^ state->f[0];
-		v[15] = blake2s_iv[7] ^ state->f[1];
-
-#define G(r, i, a, b, c, d) do { \
-	a += b + m[blake2s_sigma[r][2 * i + 0]]; \
-	d = ror32(d ^ a, 16); \
-	c += d; \
-	b = ror32(b ^ c, 12); \
-	a += b + m[blake2s_sigma[r][2 * i + 1]]; \
-	d = ror32(d ^ a, 8); \
-	c += d; \
-	b = ror32(b ^ c, 7); \
-} while (0)
-
-#define ROUND(r) do { \
-	G(r, 0, v[0], v[ 4], v[ 8], v[12]); \
-	G(r, 1, v[1], v[ 5], v[ 9], v[13]); \
-	G(r, 2, v[2], v[ 6], v[10], v[14]); \
-	G(r, 3, v[3], v[ 7], v[11], v[15]); \
-	G(r, 4, v[0], v[ 5], v[10], v[15]); \
-	G(r, 5, v[1], v[ 6], v[11], v[12]); \
-	G(r, 6, v[2], v[ 7], v[ 8], v[13]); \
-	G(r, 7, v[3], v[ 4], v[ 9], v[14]); \
-} while (0)
-		ROUND(0);
-		ROUND(1);
-		ROUND(2);
-		ROUND(3);
-		ROUND(4);
-		ROUND(5);
-		ROUND(6);
-		ROUND(7);
-		ROUND(8);
-		ROUND(9);
-
-#undef G
-#undef ROUND
-
-		for (i = 0; i < 8; ++i)
-			state->h[i] ^= v[i] ^ v[i + 8];
-
-		block += BLAKE2S_BLOCK_LEN;
-		--nblocks;
-	}
-}
-
-static void blake2s_update(struct blake2s_state *state, const void *inp, size_t inlen)
-{
-	const size_t fill = BLAKE2S_BLOCK_LEN - state->buflen;
-	const uint8_t *in = inp;
-
-	if (!inlen)
-		return;
-	if (inlen > fill) {
-		memcpy(state->buf + state->buflen, in, fill);
-		blake2s_compress(state, state->buf, 1, BLAKE2S_BLOCK_LEN);
-		state->buflen = 0;
-		in += fill;
-		inlen -= fill;
-	}
-	if (inlen > BLAKE2S_BLOCK_LEN) {
-		const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_LEN);
-		blake2s_compress(state, in, nblocks - 1, BLAKE2S_BLOCK_LEN);
-		in += BLAKE2S_BLOCK_LEN * (nblocks - 1);
-		inlen -= BLAKE2S_BLOCK_LEN * (nblocks - 1);
-	}
-	memcpy(state->buf + state->buflen, in, inlen);
-	state->buflen += inlen;
-}
-
-static void blake2s_final(struct blake2s_state *state, uint8_t *out)
-{
-	blake2s_set_lastblock(state);
-	memset(state->buf + state->buflen, 0, BLAKE2S_BLOCK_LEN - state->buflen);
-	blake2s_compress(state, state->buf, 1, state->buflen);
-	cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
-	memcpy(out, state->h, state->outlen);
-}
-
-static size_t determine_optimal_seed_len(void)
-{
-	size_t ret = 0;
-	char poolsize_str[11] = { 0 };
-	int fd = open("/proc/sys/kernel/random/poolsize", O_RDONLY);
-
-	if (fd < 0 || read(fd, poolsize_str, sizeof(poolsize_str) - 1) < 0) {
-		ewarn("%s: Unable to determine pool size, falling back to %u bits: %s",
-			applet, MIN_SEED_LEN * 8, strerror(errno));
-		ret = MIN_SEED_LEN;
-	} else
-		ret = DIV_ROUND_UP(strtoul(poolsize_str, NULL, 10), 8);
-	if (fd >= 0)
-		close(fd);
-	if (ret < MIN_SEED_LEN)
-		ret = MIN_SEED_LEN;
-	else if (ret > MAX_SEED_LEN)
-		ret = MAX_SEED_LEN;
-	return ret;
-}
-
-static int read_new_seed(uint8_t *seed, size_t len, bool *is_creditable)
-{
-	ssize_t ret;
-	int urandom_fd;
-
-	*is_creditable = false;
-	ret = getrandom(seed, len, GRND_NONBLOCK);
-	if (ret == (ssize_t)len) {
-		*is_creditable = true;
-		return 0;
-	}
-	if (ret == -1 && errno == ENOSYS) {
-		struct pollfd random_fd = {
-			.fd = open("/dev/random", O_RDONLY),
-			.events = POLLIN
-		};
-		if (random_fd.fd < 0)
-			return -errno;
-		*is_creditable = poll(&random_fd, 1, 0) == 1;
-		close(random_fd.fd);
-	} else if (getrandom(seed, len, GRND_INSECURE) == (ssize_t)len)
-		return 0;
-	urandom_fd = open("/dev/urandom", O_RDONLY);
-	if (urandom_fd < 0)
-		return -errno;
-	ret = read(urandom_fd, seed, len);
-	if (ret == (ssize_t)len)
-		ret = 0;
-	else
-		ret = -errno ? -errno : -EIO;
-	close(urandom_fd);
-	return ret;
-}
-
-static int seed_rng(uint8_t *seed, size_t len, bool credit)
-{
-	struct {
-		int entropy_count;
-		int buf_size;
-		uint8_t buffer[MAX_SEED_LEN];
-	} req = {
-		.entropy_count = credit ? len * 8 : 0,
-		.buf_size = len
-	};
-	int random_fd, ret;
-
-	if (len > sizeof(req.buffer))
-		return -EFBIG;
-	memcpy(req.buffer, seed, len);
-
-	random_fd = open("/dev/random", O_RDWR);
-	if (random_fd < 0)
-		return -errno;
-	ret = ioctl(random_fd, RNDADDENTROPY, &req);
-	if (ret)
-		ret = -errno ? -errno : -EIO;
-	close(random_fd);
-	return ret;
-}
-
-static int seed_from_file_if_exists(const char *filename, bool credit, struct blake2s_state *hash)
-{
-	uint8_t seed[MAX_SEED_LEN];
-	ssize_t seed_len;
-	int fd, dfd, ret = 0;
-
-	fd = open(filename, O_RDONLY);
-	if (fd < 0 && errno == ENOENT)
-		return 0;
-	else if (fd < 0) {
-		ret = -errno;
-		eerror("%s: Unable to open seed file: %s", applet, strerror(errno));
-		return ret;
-	}
-	dfd = open(seed_dir, O_DIRECTORY | O_RDONLY);
-	if (dfd < 0) {
-		ret = -errno;
-		close(fd);
-		eerror("%s: Unable to open seed directory: %s", applet, strerror(errno));
-		return ret;
-	}
-	seed_len = read(fd, seed, sizeof(seed));
-	if (seed_len < 0) {
-		ret = -errno;
-		eerror("%s: Unable to read seed file: %s", applet, strerror(errno));
-	}
-	close(fd);
-	if (ret) {
-		close(dfd);
-		return ret;
-	}
-	if ((unlink(filename) < 0 || fsync(dfd) < 0) && seed_len) {
-		ret = -errno;
-		eerror("%s: Unable to remove seed after reading, so not seeding: %s",
-			applet, strerror(errno));
-	}
-	close(dfd);
-	if (ret)
-		return ret;
-	if (!seed_len)
-		return 0;
-
-	blake2s_update(hash, &seed_len, sizeof(seed_len));
-	blake2s_update(hash, seed, seed_len);
-
-	einfo("Seeding %zd bits %s crediting", seed_len * 8, credit ? "and" : "without");
-	ret = seed_rng(seed, seed_len, credit);
-	if (ret < 0)
-		eerror("%s: Unable to seed: %s", applet, strerror(-ret));
-	return ret;
-}
-
-static void populate_global_paths(void)
-{
-	if (!lock_file)
-		lock_file = xstrdup("/var/run/seedrng.lock");
-	if (!seed_dir)
-		seed_dir = xstrdup("/var/lib/seedrng");
-	xasprintf(&creditable_seed, "%s/seed.credit", seed_dir);
-	xasprintf(&non_creditable_seed, "%s/seed.no-credit", seed_dir);
-}
-
-static void cleanup(void)
-{
-	free(lock_file);
-	free(seed_dir);
-	free(creditable_seed);
-	free(non_creditable_seed);
-}
-
-int main(int argc, char **argv)
-{
-	int opt;
-	static const char seedrng_prefix[] = "SeedRNG v1 Old+New Prefix";
-	static const char seedrng_failure[] = "SeedRNG v1 No New Seed Failure";
-	int ret, fd = -1, lock, program_ret = 0;
-	uint8_t new_seed[MAX_SEED_LEN];
-	size_t new_seed_len;
-	bool new_seed_creditable;
-	struct timespec realtime = { 0 }, boottime = { 0 };
-	struct blake2s_state hash;
-	bool skip_credit = false;
-
-	atexit(cleanup);
-	applet = basename_c(argv[0]);
-	if (geteuid())
-		eerrorx("%s: superuser access is required", applet);
-	umask(0077);
-
-	while ((opt = getopt_long(argc, argv, getoptstring,
-		    longopts, (int *) 0)) != -1)
-	{
-		switch (opt) {
-			case LONGOPT_LOCK_FILE:
-			if (!lock_file)
-				lock_file = xstrdup(optarg);
-			break;
-		case LONGOPT_SEED_DIR:
-			if (!seed_dir)
-				seed_dir = xstrdup(optarg);
-			break;
-		case LONGOPT_SKIP_CREDIT:
-			skip_credit = true;
-			break;
-		case_RC_COMMON_GETOPT
-		}
-	}
-	populate_global_paths();
-	blake2s_init(&hash, BLAKE2S_HASH_LEN);
-	blake2s_update(&hash, seedrng_prefix, strlen(seedrng_prefix));
-	clock_gettime(CLOCK_REALTIME, &realtime);
-	clock_gettime(CLOCK_BOOTTIME, &boottime);
-	blake2s_update(&hash, &realtime, sizeof(realtime));
-	blake2s_update(&hash, &boottime, sizeof(boottime));
-
-	if (mkdir(seed_dir, 0700) < 0 && errno != EEXIST)
-		eerrorx("%s: Unable to create \"%s\" directory: %s",
-				applet, seed_dir, strerror(errno));
-
-	lock = open(lock_file, O_WRONLY | O_CREAT, 0000);
-	if (lock < 0 || flock(lock, LOCK_EX) < 0) {
-		eerror("%s: Unable to open lock file: %s", applet, strerror(errno));
-		program_ret = 1;
-		goto out;
-	}
-
-	ret = seed_from_file_if_exists(non_creditable_seed, false, &hash);
-	if (ret < 0)
-		program_ret |= 1 << 1;
-	ret = seed_from_file_if_exists(creditable_seed, !skip_credit, &hash);
-	if (ret < 0)
-		program_ret |= 1 << 2;
-
-	new_seed_len = determine_optimal_seed_len();
-	ret = read_new_seed(new_seed, new_seed_len, &new_seed_creditable);
-	if (ret < 0) {
-		eerror("%s: Unable to read new seed: %s", applet, strerror(-ret));
-		new_seed_len = BLAKE2S_HASH_LEN;
-		strncpy((char *)new_seed, seedrng_failure, new_seed_len);
-		program_ret |= 1 << 3;
-	}
-	blake2s_update(&hash, &new_seed_len, sizeof(new_seed_len));
-	blake2s_update(&hash, new_seed, new_seed_len);
-	blake2s_final(&hash, new_seed + new_seed_len - BLAKE2S_HASH_LEN);
-
-	einfo("Saving %zu bits of %s seed for next boot", new_seed_len * 8, new_seed_creditable ? "creditable" : "non-creditable");
-	fd = open(non_creditable_seed, O_WRONLY | O_CREAT | O_TRUNC, 0400);
-	if (fd < 0) {
-		eerror("%s: Unable to open seed file for writing: %s",
-			applet, strerror(errno));
-		program_ret |= 1 << 4;
-		goto out;
-	}
-	if (write(fd, new_seed, new_seed_len) != (ssize_t)new_seed_len || fsync(fd) < 0) {
-		eerror("%s: Unable to write seed file: %s", applet, strerror(errno));
-		program_ret |= 1 << 5;
-		goto out;
-	}
-	if (new_seed_creditable && rename(non_creditable_seed, creditable_seed) < 0) {
-		ewarn("%s: Unable to make new seed creditable: %s",
-			applet, strerror(errno));
-		program_ret |= 1 << 6;
-	}
-out:
-	if (fd >= 0)
-		close(fd);
-	if (lock >= 0)
-		close(lock);
-	return program_ret;
-}