Blame src/driver/tpax_driver_ctx.c

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/**************************************************************/
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/*  tpax: a topological pax implementation                    */
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/*  Copyright (C) 2020--2021  SysDeer Technologies, LLC       */
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/*  Released under GPLv2 and GPLv3; see COPYING.TPAX.         */
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/**************************************************************/
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#define _DEFAULT_SOURCE 1
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/mman.h>
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#define ARGV_DRIVER
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#include <tpax/tpax.h>
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#include "tpax_version.h"
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#include "tpax_driver_impl.h"
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#include "argv/argv.h"
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#define TPAX_DRIVER_EXEC_MODE_MASK \
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	(TPAX_DRIVER_EXEC_MODE_LIST \
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	| TPAX_DRIVER_EXEC_MODE_READ \
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	| TPAX_DRIVER_EXEC_MODE_WRITE \
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	| TPAX_DRIVER_EXEC_MODE_COPY)
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#define TPAX_DRIVER_WRITE_FORMAT_MASK \
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	(TPAX_DRIVER_WRITE_FORMAT_PAX  \
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	| TPAX_DRIVER_WRITE_FORMAT_CPIO \
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	| TPAX_DRIVER_WRITE_FORMAT_USTAR \
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	| TPAX_DRIVER_WRITE_FORMAT_RUSTAR)
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/* package info */
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static const struct tpax_source_version tpax_src_version = {
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	TPAX_TAG_VER_MAJOR,
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	TPAX_TAG_VER_MINOR,
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	TPAX_TAG_VER_PATCH,
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	TPAX_GIT_VERSION
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};
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/* default fd context */
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static const struct tpax_fd_ctx tpax_default_fdctx = {
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	.fdin  = STDIN_FILENO,
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	.fdout = STDOUT_FILENO,
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	.fderr = STDERR_FILENO,
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	.fdcwd = AT_FDCWD,
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	.fddst = AT_FDCWD,
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	.fdlog = (-1),
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};
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struct tpax_driver_ctx_alloc {
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	struct argv_meta *		meta;
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	struct tpax_driver_ctx_impl	ctx;
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	uint64_t			guard;
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	const char *			units[];
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};
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static uint32_t tpax_argv_flags(uint32_t flags)
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{
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	uint32_t ret = ARGV_CLONE_VECTOR;
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	if (flags & TPAX_DRIVER_VERBOSITY_NONE)
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		ret |= ARGV_VERBOSITY_NONE;
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	if (flags & TPAX_DRIVER_VERBOSITY_ERRORS)
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		ret |= ARGV_VERBOSITY_ERRORS;
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	if (flags & TPAX_DRIVER_VERBOSITY_STATUS)
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		ret |= ARGV_VERBOSITY_STATUS;
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	return ret;
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}
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static int tpax_driver_usage(
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	int				fdout,
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	const char *			program,
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	const char *			arg,
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	const struct argv_option **	optv,
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	struct argv_meta *		meta)
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{
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	char header[512];
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	snprintf(header,sizeof(header),
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		"%s — topological pax implementation\n\n"
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		"Synopsis:\n"
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		"       %s [-d]\n"
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		"       %s -r [-d]\n"
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		"       %s -w [−x format] [-b blocksize] [-d]\n"
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		"       %s -r -w [-d]\n\n"
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		"Options:\n",
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		program,program,program,program,program);
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	argv_usage(fdout,header,optv,arg);
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	argv_free(meta);
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	return TPAX_USAGE;
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}
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static int tpax_driver_usage_exec_mode(
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	int				fdout,
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	const char *			program,
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	const char *			arg,
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	const struct argv_option **	optv,
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	struct argv_meta *		meta)
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{
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	tpax_driver_usage(
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		fdout,program,
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		arg,optv,meta);
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	tpax_dprintf(
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		fdout,
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		"\nWhen using explicit (long) mode options, "
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		"only one of --list, --read, --write, --copy "
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		"may be used.\n");
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	return TPAX_USAGE;
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}
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static int tpax_driver_usage_copy_mode(
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	int				fdout,
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	const char *			program,
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	const char *			arg,
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	const struct argv_option **	optv,
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	struct argv_meta *		meta,
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	struct argv_entry *		operand)
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{
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	const char * errdesc;
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	if (!operand) {
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		tpax_driver_usage(
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			fdout,program,
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			arg,optv,meta);
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		tpax_dprintf(
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			fdout,
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			"\nThe copy mode requires a destination "
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			"directory argument.\n\n");
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		return TPAX_USAGE;
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	}
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	switch (errno) {
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		case ENOENT:
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			tpax_dprintf(
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				fdout,
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				"%s: error: "
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				"the destination directory '%s' "
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				"does not exist.\n\n",
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				program,operand->arg);
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			break;
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		case ENOTDIR:
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			tpax_dprintf(
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				fdout,
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				"%s: error: "
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				"'%s' is not a directory.\n\n",
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				program,operand->arg);
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			break;
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		default:
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			if (!(errdesc = strerror(errno)))
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				errdesc = "<no error description>";
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			tpax_dprintf(
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				fdout,
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				"%s: error: while opening the "
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				"destination directory '%s': %s.\n\n",
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				program,operand->arg,errdesc);
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			break;
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	}
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	argv_free(meta);
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	return TPAX_USAGE;
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}
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static int tpax_driver_usage_write_format(
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	int				fdout,
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	const char *			program,
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	const char *			arg,
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	const struct argv_option **	optv,
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	struct argv_meta *		meta)
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{
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	tpax_driver_usage(
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		fdout,program,
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		arg,optv,meta);
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	tpax_dprintf(
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		fdout,
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		"\nArchive format may only be specified "
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		"in write mode.\n");
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	return TPAX_USAGE;
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}
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static int tpax_driver_usage_block_size(
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	int				fdout,
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	const char *			program,
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	const char *			arg,
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	const struct argv_option **	optv,
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	struct argv_meta *		meta)
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{
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	tpax_driver_usage(
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		fdout,program,
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		arg,optv,meta);
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	tpax_dprintf(
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		fdout,
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		"`%s' is not a valid positive decimal integer.\n",
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		arg);
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	return TPAX_USAGE;
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}
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static int tpax_driver_usage_block_size_range(
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	int				fdout,
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	const char *			program,
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	const char *			arg,
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	const struct argv_option **	optv,
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	struct argv_meta *		meta)
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{
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	tpax_driver_usage(
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		fdout,program,
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		arg,optv,meta);
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	tpax_dprintf(
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		fdout,
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		"`%s' is outside the specified range of 512 to 32256.\n",
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		arg);
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	return TPAX_USAGE;
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}
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static int tpax_driver_error_not_implemented(
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	int				fdout,
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	const char *			program,
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	const char *			feature,
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	struct argv_meta *		meta)
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{
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	tpax_dprintf(
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		fdout,"%s: error: %s is not yet implemented!\n\n",
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		program,feature);
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	argv_free(meta);
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	return TPAX_FATAL;
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}
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static struct tpax_driver_ctx_impl * tpax_driver_ctx_alloc(
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	struct argv_meta *		meta,
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	const struct tpax_fd_ctx *	fdctx,
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	const struct tpax_common_ctx *	cctx,
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	size_t				nunits)
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{
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	struct tpax_driver_ctx_alloc *	ictx;
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	size_t				size;
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	struct argv_entry *		entry;
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	const char **			units;
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	int				elements;
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	size =  sizeof(struct tpax_driver_ctx_alloc);
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	size += (nunits+1)*sizeof(const char *);
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	if (!(ictx = calloc(1,size)))
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		return 0;
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	memcpy(&ictx->ctx.fdctx,fdctx,sizeof(*fdctx));
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	memcpy(&ictx->ctx.cctx,cctx,sizeof(*cctx));
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	elements = sizeof(ictx->ctx.erribuf) / sizeof(*ictx->ctx.erribuf);
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	ictx->ctx.errinfp  = &ictx->ctx.erriptr[0];
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	ictx->ctx.erricap  = &ictx->ctx.erriptr[--elements];
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	ictx->meta = meta;
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	for (entry=meta->entries,units=ictx->units; entry->fopt || entry->arg; entry++)
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		if (!entry->fopt)
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			*units++ = entry->arg;
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	if (cctx->drvflags & TPAX_DRIVER_EXEC_MODE_WRITE_COPY) {
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		ictx->ctx.bufsize = TPAX_FILEIO_BUFLEN;
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		ictx->ctx.bufaddr = mmap(
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			0,ictx->ctx.bufsize,
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			PROT_READ|PROT_WRITE,
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			MAP_PRIVATE|MAP_ANONYMOUS,
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			-1,0);
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		if (ictx->ctx.bufaddr == MAP_FAILED) {
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			free(ictx);
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			return 0;
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		}
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		if (cctx->drvflags & TPAX_DRIVER_DIR_MEMBER_RECURSE)
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			ictx->ctx.dirbuff = mmap(
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				0,TPAX_DIRENT_BUFLEN,
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				PROT_READ|PROT_WRITE,
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				MAP_PRIVATE|MAP_ANONYMOUS,
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				-1,0);
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		if (ictx->ctx.dirbuff == MAP_FAILED) {
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			munmap(ictx->ctx.bufaddr,ictx->ctx.bufsize);
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			free(ictx);
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			return 0;
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		}
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	}
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	ictx->ctx.ctx.units = ictx->units;
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	ictx->ctx.ctx.errv  = ictx->ctx.errinfp;
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	return &ictx->ctx;
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}
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static int tpax_get_driver_ctx_fail(struct argv_meta * meta)
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{
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	argv_free(meta);
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	return -1;
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}
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int tpax_get_driver_ctx(
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	char **				argv,
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	char **				envp,
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	uint32_t			flags,
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	const struct tpax_fd_ctx *	fdctx,
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	struct tpax_driver_ctx ** 	pctx)
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{
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	struct tpax_driver_ctx_impl *	ctx;
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	struct tpax_common_ctx		cctx;
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	const struct argv_option *	optv[TPAX_OPTV_ELEMENTS];
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	struct argv_meta *		meta;
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	struct argv_entry *		entry;
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	struct argv_entry *		operand;
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	size_t				nunits;
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	const char *			program;
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	int				fddst;
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	const char *			ch;
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	(void)envp;
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	if (!fdctx)
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		fdctx = &tpax_default_fdctx;
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	argv_optv_init(tpax_default_options,optv);
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	if (!(meta = argv_get(
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			argv,optv,
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			tpax_argv_flags(flags),
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			fdctx->fderr)))
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		return -1;
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	nunits	= 0;
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	operand = 0;
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	program = argv_program_name(argv[0]);
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	memset(&cctx,0,sizeof(cctx));
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	cctx.drvflags = flags;
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	fddst         = fdctx->fddst;
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	/* get options, count units */
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	for (entry=meta->entries; entry->fopt || entry->arg; entry++) {
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		if (entry->fopt) {
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			switch (entry->tag) {
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				case TAG_HELP:
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					if (flags & TPAX_DRIVER_VERBOSITY_USAGE)
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						return tpax_driver_usage(
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							fdctx->fdout,
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							program,entry->arg,
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							optv,meta);
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					break;
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				case TAG_VERSION:
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					cctx.drvflags |= TPAX_DRIVER_VERSION;
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					break;
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				case TAG_LIST:
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					cctx.drvflags |= TPAX_DRIVER_EXEC_MODE_LIST;
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					break;
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				case TAG_READ:
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					cctx.drvflags |= TPAX_DRIVER_EXEC_MODE_READ;
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					break;
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				case TAG_WRITE:
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					cctx.drvflags |= TPAX_DRIVER_EXEC_MODE_WRITE;
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					break;
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				case TAG_COPY:
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					cctx.drvflags |= TPAX_DRIVER_EXEC_MODE_COPY;
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					break;
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				case TAG_FORMAT:
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					cctx.drvflags &= ~(uint64_t)(TPAX_DRIVER_WRITE_FORMAT_MASK);
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					if (!strcmp(entry->arg,"pax"))
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						cctx.drvflags |= TPAX_DRIVER_WRITE_FORMAT_PAX;
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					else if (!strcmp(entry->arg,"cpio"))
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						cctx.drvflags |= TPAX_DRIVER_WRITE_FORMAT_CPIO;
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					else if (!strcmp(entry->arg,"ustar"))
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						cctx.drvflags |= TPAX_DRIVER_WRITE_FORMAT_USTAR;
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					else if (!strcmp(entry->arg,"rustar"))
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						cctx.drvflags |= TPAX_DRIVER_WRITE_FORMAT_RUSTAR;
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					break;
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				case TAG_BLKSIZE:
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					ch = (entry->arg[0] == '+')
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						? &entry->arg[1]
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						: entry->arg;
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					for (; *ch; ch++)
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						if ((*ch < '0') || (*ch > '9'))
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							return tpax_driver_usage_block_size(
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								fdctx->fdout,
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								program,entry->arg,
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								optv,meta);
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					cctx.blksize = atoi(entry->arg);
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					if ((cctx.blksize < 512) || (cctx.blksize > 32256))
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						return tpax_driver_usage_block_size_range(
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							fdctx->fdout,
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							program,entry->arg,
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							optv,meta);
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					break;
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				case TAG_RECURSE:
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					cctx.drvflags |= TPAX_DRIVER_DIR_MEMBER_RECURSE;
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					break;
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				case TAG_NORECURSE:
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					cctx.drvflags &= ~(uintptr_t)TPAX_DRIVER_DIR_MEMBER_RECURSE;
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					break;
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				case TAG_STRICT_PATH:
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					cctx.drvflags |= TPAX_DRIVER_STRICT_PATH_INPUT;
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					break;
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				case TAG_PURE_PATH:
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					cctx.drvflags |= TPAX_DRIVER_PURE_PATH_OUTPUT;
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					break;
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			}
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		} else {
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			operand = entry;
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			nunits++;
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		}
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	}
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	/* incompatible arguments? */
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	switch (cctx.drvflags & TPAX_DRIVER_EXEC_MODE_MASK) {
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		case 0:
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			if (!(cctx.drvflags & TPAX_DRIVER_VERSION))
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				cctx.drvflags |= TPAX_DRIVER_EXEC_MODE_LIST;
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			break;
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		case TPAX_DRIVER_EXEC_MODE_READ|TPAX_DRIVER_EXEC_MODE_WRITE:
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			cctx.drvflags &= ~(uint64_t)(TPAX_DRIVER_EXEC_MODE_READ);
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			cctx.drvflags &= ~(uint64_t)(TPAX_DRIVER_EXEC_MODE_WRITE);
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			cctx.drvflags |= TPAX_DRIVER_EXEC_MODE_COPY;
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			break;
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		case TPAX_DRIVER_EXEC_MODE_LIST:
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		case TPAX_DRIVER_EXEC_MODE_READ:
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		case TPAX_DRIVER_EXEC_MODE_WRITE:
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		case TPAX_DRIVER_EXEC_MODE_COPY:
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			break;
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		default:
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			return tpax_driver_usage_exec_mode(
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				fdctx->fderr,
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				program,entry->arg,
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				optv,meta);
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	}
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	/* copy mode: destination directory */
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	if (cctx.drvflags & TPAX_DRIVER_EXEC_MODE_COPY) {
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		if (!operand)
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			return tpax_driver_usage_copy_mode(
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				fdctx->fderr,
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				program,entry->arg,
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				optv,meta,operand);
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		fddst = openat(
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			fdctx->fdcwd,
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			operand->arg,
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			O_RDONLY|O_DIRECTORY|O_CLOEXEC,0);
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		if (fddst < 0)
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			return tpax_driver_usage_copy_mode(
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				fdctx->fderr,
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				program,entry->arg,
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				optv,meta,operand);
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	}
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	/* not implemented mode(s) */
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	switch (cctx.drvflags & TPAX_DRIVER_EXEC_MODE_MASK) {
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		case TPAX_DRIVER_EXEC_MODE_LIST:
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			return tpax_driver_error_not_implemented(
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				fdctx->fderr,program,"list mode",meta);
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		case TPAX_DRIVER_EXEC_MODE_READ:
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			return tpax_driver_error_not_implemented(
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				fdctx->fderr,program,"read mode",meta);
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		case TPAX_DRIVER_EXEC_MODE_COPY:
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			close(fddst);
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			return tpax_driver_error_not_implemented(
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				fdctx->fderr,program,"copy mode",meta);
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		default:
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			break;
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	}
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	/* archive format vs. execution mode*/
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	switch (cctx.drvflags & TPAX_DRIVER_EXEC_MODE_MASK) {
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		case TPAX_DRIVER_EXEC_MODE_WRITE:
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			if (!(cctx.drvflags & TPAX_DRIVER_WRITE_FORMAT_MASK))
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				cctx.drvflags |= TPAX_DRIVER_WRITE_FORMAT_USTAR;
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			break;
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		default:
8aa3fc
			if (cctx.drvflags & TPAX_DRIVER_WRITE_FORMAT_MASK)
8aa3fc
				return tpax_driver_usage_write_format(
8aa3fc
					fdctx->fderr,program,
8aa3fc
					entry->arg,optv,meta);
8aa3fc
	}
8aa3fc
8aa3fc
	/* not implemented archive format(s) */
8aa3fc
	switch (cctx.drvflags & TPAX_DRIVER_WRITE_FORMAT_MASK) {
8aa3fc
		case TPAX_DRIVER_WRITE_FORMAT_PAX:
8aa3fc
			return tpax_driver_error_not_implemented(
8aa3fc
				fdctx->fderr,program,"the pax format",meta);
8aa3fc
8aa3fc
		case TPAX_DRIVER_WRITE_FORMAT_CPIO:
8aa3fc
			return tpax_driver_error_not_implemented(
8aa3fc
				fdctx->fderr,program,"the cpio format",meta);
8aa3fc
8aa3fc
		default:
8aa3fc
			break;
8aa3fc
	}
8aa3fc
8aa3fc
	/* driver ctx */
893ea2
	if (!(ctx = tpax_driver_ctx_alloc(meta,fdctx,&cctx,nunits))) {
893ea2
		if (cctx.drvflags & TPAX_DRIVER_EXEC_MODE_COPY)
893ea2
			close(fddst);
893ea2
88751e
		return tpax_get_driver_ctx_fail(meta);
893ea2
	}
88751e
88751e
	ctx->ctx.program	= program;
88751e
	ctx->ctx.cctx		= &ctx->cctx;
88751e
88751e
	*pctx = &ctx->ctx;
88751e
	return TPAX_OK;
88751e
}
88751e
88751e
static void tpax_free_driver_ctx_impl(struct tpax_driver_ctx_alloc * ictx)
88751e
{
d7918a
	void *  next;
d7918a
	size_t  size;
d7918a
d7918a
	for (; ictx->ctx.dirents; ) {
d7918a
		next = ictx->ctx.dirents->next;
d7918a
		size = ictx->ctx.dirents->size;
d7918a
d7918a
		munmap(ictx->ctx.dirents,size);
d7918a
		ictx->ctx.dirents = (struct tpax_dirent_buffer *)next;
d7918a
	}
d7918a
76f8c5
	if (ictx->ctx.bufaddr)
76f8c5
		munmap(ictx->ctx.bufaddr,ictx->ctx.bufsize);
76f8c5
d7918a
	if (ictx->ctx.dirbuff)
d7918a
		munmap(ictx->ctx.dirbuff,TPAX_DIRENT_BUFLEN);
d7918a
88751e
	argv_free(ictx->meta);
88751e
	free(ictx);
88751e
}
88751e
88751e
void tpax_free_driver_ctx(struct tpax_driver_ctx * ctx)
88751e
{
88751e
	struct tpax_driver_ctx_alloc *	ictx;
88751e
	uintptr_t			addr;
88751e
88751e
	if (ctx) {
88751e
		addr = (uintptr_t)ctx - offsetof(struct tpax_driver_ctx_impl,ctx);
88751e
		addr = addr - offsetof(struct tpax_driver_ctx_alloc,ctx);
88751e
		ictx = (struct tpax_driver_ctx_alloc *)addr;
88751e
		tpax_free_driver_ctx_impl(ictx);
88751e
	}
88751e
}
88751e
88751e
const struct tpax_source_version * tpax_source_version(void)
88751e
{
88751e
	return &tpax_src_version;
88751e
}
88751e
88751e
int tpax_get_driver_fdctx(
88751e
	const struct tpax_driver_ctx *	dctx,
88751e
	struct tpax_fd_ctx *		fdctx)
88751e
{
88751e
	struct tpax_driver_ctx_impl *	ictx;
88751e
88751e
	ictx = tpax_get_driver_ictx(dctx);
88751e
88751e
	fdctx->fdin  = ictx->fdctx.fdin;
88751e
	fdctx->fdout = ictx->fdctx.fdout;
88751e
	fdctx->fderr = ictx->fdctx.fderr;
88751e
	fdctx->fdlog = ictx->fdctx.fdlog;
88751e
	fdctx->fdcwd = ictx->fdctx.fdcwd;
88751e
	fdctx->fddst = ictx->fdctx.fddst;
88751e
88751e
	return 0;
88751e
}
88751e
88751e
int tpax_set_driver_fdctx(
88751e
	struct tpax_driver_ctx *	dctx,
88751e
	const struct tpax_fd_ctx *	fdctx)
88751e
{
88751e
	struct tpax_driver_ctx_impl *	ictx;
88751e
88751e
	ictx = tpax_get_driver_ictx(dctx);
88751e
88751e
	ictx->fdctx.fdin  = fdctx->fdin;
88751e
	ictx->fdctx.fdout = fdctx->fdout;
88751e
	ictx->fdctx.fderr = fdctx->fderr;
88751e
	ictx->fdctx.fdlog = fdctx->fdlog;
88751e
	ictx->fdctx.fdcwd = fdctx->fdcwd;
88751e
	ictx->fdctx.fddst = fdctx->fddst;
88751e
88751e
	return 0;
88751e
}