Blame src/driver/ntux_driver_ctx.c

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/***********************************************************/
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/*  ntux: native translation und extension                 */
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/*  Copyright (C) 2016--2018  Z. Gilboa                    */
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/*  Released under GPLv2 and GPLv3; see COPYING.NTUX.      */
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/***********************************************************/
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#include <ntapi/ntapi.h>
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#include <psxscl/psxscl.h>
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#include <psxabi/sys_fcntl.h>
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#include <stdint.h>
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#include <ntux/ntux.h>
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#include "ntux_init_impl.h"
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#include "ntux_nolibc_impl.h"
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#define ARGV_DRIVER
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#include "ntux_version.h"
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#include "ntux_driver_impl.h"
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#include "argv/argv.h"
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/* framework integration */
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#include <psxtypes/section/midipix.h>
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__attr_section_decl__(".midipix")
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static const nt_tty_affiliation tty_affiliation
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	__attr_section__(".midipix")
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	= NT_TTY_AFFILIATION_DEFAULT;
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/* ntapi accessor table */
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const ntapi_vtbl * ntux_ntapi;
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/* ntux command names */
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static const char * const ntux_cmd_name[NTUX_CMD_CAP] = {
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	[NTUX_CMD_STAT]       = "stat",
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	[NTUX_CMD_SPAWN]      = "spawn",
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	[NTUX_CMD_STRACE]     = "strace",
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};
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/* ntux command options */
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static const struct argv_option * ntux_cmd_options[NTUX_CMD_CAP] = {
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	[NTUX_CMD_DEFAULT]    = ntux_default_options,
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	[NTUX_CMD_STAT]       = ntux_default_options,
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	[NTUX_CMD_SPAWN]      = ntux_spawn_options,
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	[NTUX_CMD_STRACE]     = ntux_strace_options,
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};
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/* package info */
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static const struct ntux_source_version ntux_src_version = {
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	NTUX_TAG_VER_MAJOR,
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	NTUX_TAG_VER_MINOR,
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	NTUX_TAG_VER_PATCH,
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	NTUX_GIT_VERSION
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};
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struct ntux_driver_ctx_alloc {
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	struct argv_meta *		meta;
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	struct ntux_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 ntux_argv_flags(uint32_t flags)
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{
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	uint32_t ret = 0;
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	if (flags & NTUX_DRIVER_VERBOSITY_NONE)
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		ret |= ARGV_VERBOSITY_NONE;
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	if (flags & NTUX_DRIVER_VERBOSITY_ERRORS)
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		ret |= ARGV_VERBOSITY_ERRORS;
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	if (flags & NTUX_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 ntux_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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	enum ntux_cmd			cmd)
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{
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	char		header[512];
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	char *		cmdarg[2];
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	const char *	cmdname;
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	if (cmd == NTUX_CMD_DEFAULT) {
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		cmdarg[0] = "";
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		cmdarg[1] = "";
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		cmdname   = "";
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	} else {
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		cmdarg[0] = " (--cmd=";
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		cmdarg[1] = ")";
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		cmdname   = ntux_cmd_name[cmd];
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	}
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	snprintf(header,sizeof(header),
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		"Usage: %s [options] ...\n"
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		"Usage: %s [options] [--cmd=<command>] <arg> <arg> ...\n\n"
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		"Notes: --cmd must precede all non-option arguments, as well as\n"
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		"       all arguments that are specific to the selected command;\n"
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		"       for commands that spawn other programs (e.g. spawn, strace),\n"
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		"       the first non-option argument must specify the name of the\n"
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		"       program to be executed.\n\n"
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		"Options%s%s%s:\n",
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		program,program,cmdarg[0],cmdname,cmdarg[1]);
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	argv_usage(fdout,header,optv,arg);
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	argv_free(meta);
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	return NTUX_USAGE;
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}
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static struct ntux_driver_ctx_impl * ntux_driver_ctx_alloc(
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	struct argv_meta *		meta,
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	const struct ntux_fd_ctx *	fdctx,
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	const struct ntux_common_ctx *	cctx,
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	size_t				nunits)
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{
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	struct ntux_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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	(void)tty_affiliation;
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	size =  sizeof(struct ntux_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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	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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	memcpy(&ictx->ctx.fdctx,fdctx,sizeof(*fdctx));
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	memcpy(&ictx->ctx.cctx,cctx,sizeof(*cctx));
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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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	ictx->meta = meta;
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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 ntux_cctx_update(
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	const char *			program,
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	const struct argv_option **	optv,
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	struct argv_meta *		meta,
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	uint32_t			flags,
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	const struct ntux_fd_ctx *	fdctx,
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	struct ntux_common_ctx *	cctx,
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	size_t *			nunits)
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{
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	struct argv_entry *		entry;
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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 & NTUX_DRIVER_VERBOSITY_USAGE)
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						return ntux_driver_usage(
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							fdctx->fdout,
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							program,entry->arg,
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							optv,0,cctx->cmd);
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				case TAG_VERSION:
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					cctx->drvflags |= NTUX_DRIVER_VERSION;
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					break;
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				case TAG_CMD:
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					if (*nunits)
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						return ntux_driver_usage(
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							fdctx->fderr,
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							program,entry->arg,
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							optv,0,cctx->cmd);
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					if (!strcmp(entry->arg,"stat"))
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						cctx->cmd = NTUX_CMD_STAT;
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					else if (!strcmp(entry->arg,"spawn"))
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						cctx->cmd = NTUX_CMD_SPAWN;
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					else if (!strcmp(entry->arg,"strace"))
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						cctx->cmd = NTUX_CMD_STRACE;
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					break;
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				case TAG_LOADER:
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					cctx->loader = entry->arg;
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					break;
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				case TAG_LOGFILE:
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					cctx->logfile = entry->arg;
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					break;
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			}
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		} else {
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			(*nunits)++;
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		}
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	}
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	return 0;
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}
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static int ntux_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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static int ntux_cmd_from_program(const char * program)
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{
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	const char *	dot;
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	const char *	hyphen;
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	const char *	mark;
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	dot    = strrchr(program,'.');
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	hyphen = strrchr(program,'-');
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	if (hyphen > dot)
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		mark = ++hyphen;
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	else if (dot > hyphen)
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		mark = ++dot;
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	else
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		mark = program;
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	if (!strcmp(mark,"stat"))
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		return NTUX_CMD_STAT;
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	else if (!strcmp(mark,"spawn"))
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		return NTUX_CMD_SPAWN;
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	else if (!strcmp(mark,"strace"))
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		return NTUX_CMD_STRACE;
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	return NTUX_CMD_DEFAULT;
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}
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int ntux_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 ntux_fd_ctx *	fdctx,
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	struct ntux_driver_ctx **	pctx)
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{
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	struct ntux_driver_ctx_impl *	ictx;
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	struct ntux_common_ctx		cctx;
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	const struct argv_option *	optv[NTUX_OPTV_ELEMENTS];
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	struct argv_meta *		meta;
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	size_t				nunits;
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	const char *			program;
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	char **				parg;
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	char **				cmdargv;
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	char *				cmdmark;
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	char **				execargv;
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	char *				execarg;
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	struct argv_ctx			ctx = {ARGV_VERBOSITY_NONE,
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                                               ARGV_MODE_SCAN,
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                                               0,0,0,0,0,0,0};
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	/* init */
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	if (ntux_init())
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		return -1;
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	/* fdctx */
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	if (!fdctx) {
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		fdctx = &(const struct ntux_fd_ctx) {
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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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			.fdlog = (-1),
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			.fdcwd = AT_FDCWD,
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			.fddst = AT_FDCWD,
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		};
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	}
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	/* cctx */
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	memset(&cctx,0,sizeof(cctx));
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	nunits	      = 0;
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	execargv      = 0;
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	program       = argv_program_name(argv[0]);
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	cctx.cmd      = ntux_cmd_from_program(program);
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	cctx.drvflags = flags;
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	/* missing arguments? */
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	argv_optv_init(ntux_cmd_options[cctx.cmd],optv);
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	if (!argv[1] && (flags & NTUX_DRIVER_VERBOSITY_USAGE))
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		return ntux_driver_usage(
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			fdctx->fderr,
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			program,0,
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			optv,0,cctx.cmd);
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	/* initial argv scan: ... --cmd=xxx ... */
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	for (parg=argv, cmdargv=0; *parg && !cmdargv; parg++) {
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		if (!strcmp(*parg,"--cmd") && parg[1]) {
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				cmdargv = &parg[2];
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				cmdmark = parg[2];
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		} else if (!strncmp(*parg,"--cmd=",6)) {
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				cmdargv = &parg[1];
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				cmdmark = parg[1];
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		}
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	}
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	/* process argv entries preceding --cmd */
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	if (cmdargv) {
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		*cmdargv = 0;
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		if (!(meta = argv_get(
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				argv,optv,
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				ntux_argv_flags(flags),
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				fdctx->fderr)))
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			return -1;
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		if (ntux_cctx_update(
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				program,optv,meta,flags,
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				fdctx,&cctx,&nunits)) {
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			argv_free(meta);
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			return -1;
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		}
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		*cmdargv-- = cmdmark;
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		*cmdargv   = argv[0];
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		argv       = cmdargv;
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	}
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	/* set option vector by command */
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	if (cctx.cmd == NTUX_CMD_SPAWN)
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		argv_optv_init(ntux_spawn_options,optv);
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	else if (cctx.cmd == NTUX_CMD_STRACE)
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		argv_optv_init(ntux_strace_options,optv);
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	/* spawn, strace */
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	if ((cctx.cmd == NTUX_CMD_SPAWN) || (cctx.cmd == NTUX_CMD_STRACE)) {
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		argv_scan(argv,optv,&ctx,0);
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		if (ctx.erridx && !ctx.unitidx) {
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			if (flags & NTUX_DRIVER_VERBOSITY_ERRORS)
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				argv_get(
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					argv,optv,
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					ntux_argv_flags(flags),
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					fdctx->fderr);
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			return -1;
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		}
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		if (!ctx.unitidx && (flags & NTUX_DRIVER_VERBOSITY_USAGE))
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			ntux_driver_usage(
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				fdctx->fderr,
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				program,0,
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				optv,0,cctx.cmd);
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		if (!ctx.unitidx)
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			return NTUX_ERROR;
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		execargv  = &argv[ctx.unitidx];
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		execarg   = argv[ctx.unitidx];
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		*execargv = 0;
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	}
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	/* obtain ntux's own arguments */
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	if (!(meta = argv_get(
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			argv,optv,
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			ntux_argv_flags(flags),
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			fdctx->fderr)))
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		return -1;
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	if (ntux_cctx_update(
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			program,optv,meta,flags,
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			fdctx,&cctx,&nunits)) {
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		argv_free(meta);
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		return -1;
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	}
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	/* spawn, strace: exec argv */
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	if (execargv) {
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		*execargv  = execarg;
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		cctx.sargv = execargv;
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		cctx.senvp = envp;
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		nunits     = 0;
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	}
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	/* finalize */
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	if (nunits && !cctx.cmd)
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		return ntux_driver_usage(
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			fdctx->fderr,
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			program,0,
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			optv,meta,
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			NTUX_CMD_DEFAULT);
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	if (!(ictx = ntux_driver_ctx_alloc(meta,fdctx,&cctx,nunits)))
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		return ntux_get_driver_ctx_fail(meta);
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	ictx->ctx.program = program;
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	ictx->ctx.cctx    = &ictx->cctx;
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	*pctx             = &ictx->ctx;
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	return 0;
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}
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static void ntux_free_driver_ctx_impl(struct ntux_driver_ctx_alloc * ictx)
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{
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	argv_free(ictx->meta);
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	free(ictx);
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}
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void ntux_free_driver_ctx(struct ntux_driver_ctx * ctx)
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{
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	struct ntux_driver_ctx_alloc *	ictx;
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	uintptr_t			addr;
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	if (ctx) {
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		addr = (uintptr_t)ctx - offsetof(struct ntux_driver_ctx_impl,ctx);
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		addr = addr - offsetof(struct ntux_driver_ctx_alloc,ctx);
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		ictx = (struct ntux_driver_ctx_alloc *)addr;
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		ntux_free_driver_ctx_impl(ictx);
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	}
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}
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const struct ntux_source_version * ntux_source_version(void)
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{
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	return &ntux_src_version;
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}
ec0005
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int ntux_get_driver_fdctx(
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	const struct ntux_driver_ctx *	dctx,
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	struct ntux_fd_ctx *		fdctx)
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{
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	struct ntux_driver_ctx_impl *	ictx;
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	ictx = ntux_get_driver_ictx(dctx);
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	fdctx->fdin  = ictx->fdctx.fdin;
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	fdctx->fdout = ictx->fdctx.fdout;
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	fdctx->fderr = ictx->fdctx.fderr;
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	fdctx->fdlog = ictx->fdctx.fdlog;
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	fdctx->fdcwd = ictx->fdctx.fdcwd;
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	fdctx->fddst = ictx->fdctx.fddst;
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	return 0;
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}
ec0005
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int ntux_set_driver_fdctx(
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	struct ntux_driver_ctx *	dctx,
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	const struct ntux_fd_ctx *	fdctx)
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{
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	struct ntux_driver_ctx_impl *	ictx;
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	ictx = ntux_get_driver_ictx(dctx);
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	ictx->fdctx.fdin  = fdctx->fdin;
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	ictx->fdctx.fdout = fdctx->fdout;
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	ictx->fdctx.fderr = fdctx->fderr;
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	ictx->fdctx.fdlog = fdctx->fdlog;
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	ictx->fdctx.fdcwd = fdctx->fdcwd;
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	ictx->fdctx.fddst = fdctx->fddst;
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	return 0;
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}