/*******************************************************************/

/*  slibtool: a skinny libtool implementation, written in C        */

/*  Copyright (C) 2016--2021  SysDeer Technologies, LLC            */

/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */

/*******************************************************************/

#include <ctype.h>

#include <fcntl.h>

#include <stdio.h>

#include <stdint.h>

#include <stdbool.h>

#include <unistd.h>

#include <sys/mman.h>

#include <sys/stat.h>

#include "slibtool_lconf_impl.h"

#include "slibtool_driver_impl.h"

#include "slibtool_errinfo_impl.h"

#include "slibtool_symlink_impl.h"

#include "slibtool_readlink_impl.h"

enum slbt_lconf_opt {

	SLBT_LCONF_OPT_UNKNOWN,

	SLBT_LCONF_OPT_NO,

	SLBT_LCONF_OPT_YES,

};

static const char aclr_reset[]   = "\x1b[0m";

static const char aclr_bold[]    = "\x1b[1m";

static const char aclr_red[]     = "\x1b[31m";

static const char aclr_green[]   = "\x1b[32m";

static const char aclr_yellow[]  = "\x1b[33m";

static const char aclr_blue[]    = "\x1b[34m";

static const char aclr_magenta[] = "\x1b[35m";

static void slbt_lconf_close(int fdcwd, int fdlconfdir)

{

	if (fdlconfdir != fdcwd)

		close(fdlconfdir);

}

static int slbt_lconf_trace_lconf_plain(

	struct slbt_driver_ctx *	dctx,

	const char *			lconf)

{

	int fderr = slbt_driver_fderr(dctx);

	if (slbt_dprintf(

			fderr,

			"%s: %s: {.name=%c%s%c}.\n",

			dctx->program,

			"lconf",

			'"',lconf,'"') < 0)

		return -1;

	return 0;

}

static int slbt_lconf_trace_lconf_annotated(

	struct slbt_driver_ctx *	dctx,

	const char *			lconf)

{

	int fderr = slbt_driver_fderr(dctx);

	if (slbt_dprintf(

			fderr,

			"%s%s%s%s: %s%s%s: {.name=%s%s%c%s%c%s}.\n",

			aclr_bold,aclr_magenta,

			dctx->program,

			aclr_reset,

			aclr_bold,

			"lconf",

			aclr_reset,

			aclr_bold,aclr_green,

			'"',lconf,'"',

			aclr_reset) < 0)

		return -1;

	return 0;

}

static int slbt_lconf_trace_openat_silent(

	struct slbt_driver_ctx *	dctx,

	int				fdat,

	const char *			path,

	int				oflag,

	int				mode)

{

	(void)dctx;

	return openat(fdat,path,oflag,mode);

}

static int slbt_lconf_trace_openat_plain(

	struct slbt_driver_ctx *	dctx,

	int				fdat,

	const char *			path,

	int				oflag,

	int				mode)

{

	char scwd[20];

	char serr[512];

	int  ret   = openat(fdat,path,oflag,mode);

	int  fderr = slbt_driver_fderr(dctx);

	if (fdat == AT_FDCWD) {

		strcpy(scwd,"AT_FDCWD");

	} else {

		sprintf(scwd,"%d",fdat);

	}

	if ((ret < 0) && (errno == ENOENT)) {

		strcpy(serr," [ENOENT]");

	} else if (ret < 0) {

		memset(serr,0,sizeof(serr));

		strerror_r(errno,&serr[2],sizeof(serr)-4);

		serr[0] = ' ';

		serr[1] = '(';

		serr[strlen(serr)] = ')';

	} else {

		serr[0] = 0;

	}

	slbt_dprintf(

		fderr,

		"%s: %s: openat(%s,%c%s%c,%s,%d) = %d%s.\n",

		dctx->program,

		"lconf",

		scwd,

		'"',path,'"',

		(oflag == O_DIRECTORY) ? "O_DIRECTORY" : "O_RDONLY",

		mode,ret,serr);

	return ret;

}

static int slbt_lconf_trace_openat_annotated(

	struct slbt_driver_ctx *	dctx,

	int				fdat,

	const char *			path,

	int				oflag,

	int				mode)

{

	char scwd[20];

	char serr[512];

	int  ret   = openat(fdat,path,oflag,mode);

	int  fderr = slbt_driver_fderr(dctx);

	if (fdat == AT_FDCWD) {

		strcpy(scwd,"AT_FDCWD");

	} else {

		sprintf(scwd,"%d",fdat);

	}

	if ((ret < 0) && (errno == ENOENT)) {

		strcpy(serr," [ENOENT]");

	} else if (ret < 0) {

		memset(serr,0,sizeof(serr));

		strerror_r(errno,&serr[2],sizeof(serr)-4);

		serr[0] = ' ';

		serr[1] = '(';

		serr[strlen(serr)] = ')';

	} else {

		serr[0] = 0;

	}

	slbt_dprintf(

		fderr,

		"%s%s%s%s: %s%s%s: openat(%s%s%s%s,%s%s%c%s%c%s,%s%s%s%s,%d) = %s%d%s%s%s%s%s.\n",

		aclr_bold,aclr_magenta,

		dctx->program,

		aclr_reset,

		aclr_bold,

		"lconf",

		aclr_reset,

		aclr_bold,aclr_blue,

		scwd,

		aclr_reset,

		aclr_bold,aclr_green,

		'"',path,'"',

		aclr_reset,

		aclr_bold,aclr_blue,

		(oflag == O_DIRECTORY) ? "O_DIRECTORY" : "O_RDONLY",

		aclr_reset,

		mode,

		aclr_bold,

		ret,

		aclr_reset,

		aclr_bold,aclr_red,

		serr,

		aclr_reset);

	return ret;

}

static int slbt_lconf_trace_fstat_silent(

	struct slbt_driver_ctx *	dctx,

	int				fd,

	const char *			path,

	struct stat *			st)

{

	(void)dctx;

	return path ? fstatat(fd,path,st,0) : fstat(fd,st);

}

static int slbt_lconf_trace_fstat_plain(

	struct slbt_driver_ctx *	dctx,

	int				fd,

	const char *			path,

	struct stat *			st)

{

	char scwd[20];

	char serr[512];

	char quot[2] = {'"',0};

	int  ret   = path ? fstatat(fd,path,st,0) : fstat(fd,st);

	int  fderr = slbt_driver_fderr(dctx);

	if (fd == AT_FDCWD) {

		strcpy(scwd,"AT_FDCWD");

	} else {

		sprintf(scwd,"%d",fd);

	}

	if ((ret < 0) && (errno == ENOENT)) {

		strcpy(serr," [ENOENT]");

	} else if (ret < 0) {

		memset(serr,0,sizeof(serr));

		strerror_r(errno,&serr[2],sizeof(serr)-4);

		serr[0] = ' ';

		serr[1] = '(';

		serr[strlen(serr)] = ')';

	} else {

		serr[0] = 0;

	}

	slbt_dprintf(

		fderr,

		"%s: %s: %s(%s%s%s%s%s,...) = %d%s%s",

		dctx->program,

		"lconf",

		path ? "fstatat" : "fstat",

		scwd,

		path ? "," : "",

		path ? quot : "",

		path ? path : "",

		path ? quot : "",

		ret,

		serr,

		ret ? ".\n" : "");

	if (ret == 0)

		slbt_dprintf(

			fderr,

			" {.st_dev = %ld, .st_ino = %ld}.\n",

			st->st_dev,

			st->st_ino);

	return ret;

}

static int slbt_lconf_trace_fstat_annotated(

	struct slbt_driver_ctx *	dctx,

	int				fd,

	const char *			path,

	struct stat *			st)

{

	char scwd[20];

	char serr[512];

	char quot[2] = {'"',0};

	int  ret   = path ? fstatat(fd,path,st,0) : fstat(fd,st);

	int  fderr = slbt_driver_fderr(dctx);

	if (fd == AT_FDCWD) {

		strcpy(scwd,"AT_FDCWD");

	} else {

		sprintf(scwd,"%d",fd);

	}

	if ((ret < 0) && (errno == ENOENT)) {

		strcpy(serr," [ENOENT]");

	} else if (ret < 0) {

		memset(serr,0,sizeof(serr));

		strerror_r(errno,&serr[2],sizeof(serr)-4);

		serr[0] = ' ';

		serr[1] = '(';

		serr[strlen(serr)] = ')';

	} else {

		serr[0] = 0;

	}

	slbt_dprintf(

		fderr,

		"%s%s%s%s: %s%s%s: %s(%s%s%s%s%s%s%s%s%s%s%s,...) = %s%d%s%s%s%s%s%s",

		aclr_bold,aclr_magenta,

		dctx->program,

		aclr_reset,

		aclr_bold,

		"lconf",

		aclr_reset,

		path ? "fstatat" : "fstat",

		aclr_bold,aclr_blue,

		scwd,

		aclr_reset,

		aclr_bold,aclr_green,

		path ? "," : "",

		path ? quot : "",

		path ? path : "",

		path ? quot : "",

		aclr_reset,

		aclr_bold,

		ret,

		aclr_reset,

		aclr_bold,aclr_red,

		serr,

		aclr_reset,

		ret ? ".\n" : "");

	if (ret == 0)

		slbt_dprintf(

			fderr,

			" {%s%s.st_dev%s = %s%ld%s, %s%s.st_ino%s = %s%ld%s}.\n",

			aclr_bold,aclr_yellow,aclr_reset,

			aclr_bold,

			st->st_dev,

			aclr_reset,

			aclr_bold,aclr_yellow,aclr_reset,

			aclr_bold,

			st->st_ino,

			aclr_reset);

	return ret;

}

static int slbt_lconf_trace_result_silent(

	struct slbt_driver_ctx *	dctx,

	int				fd,

	int				fdat,

	const char *			lconf,

	int				err)

{

	(void)dctx;

	(void)fd;

	(void)fdat;

	(void)lconf;

	return err ? (-1) : fd;

}

static int slbt_lconf_trace_result_plain(

	struct slbt_driver_ctx *	dctx,

	int				fd,

	int				fdat,

	const char *			lconf,

	int				err)

{

	int             fderr;

	const char *    cpath;

	char            path[PATH_MAX];

	fderr = slbt_driver_fderr(dctx);

	cpath = !(slbt_realpath(fdat,lconf,0,path,sizeof(path)))

		? path : lconf;

	switch (err) {

		case 0:

			slbt_dprintf(

				fderr,

				"%s: %s: found %c%s%c.\n",

				dctx->program,

				"lconf",

				'"',cpath,'"');

			return fd;

		case EXDEV:

			slbt_dprintf(

				fderr,

				"%s: %s: stopped in %c%s%c "

				"(config file not found on current device).\n",

				dctx->program,

				"lconf",

				'"',cpath,'"');

			return -1;

		default:

			slbt_dprintf(

				fderr,

				"%s: %s: stopped in %c%s%c "

				"(top-level directory reached).\n",

				dctx->program,

				"lconf",

				'"',cpath,'"');

			return -1;

	}

}

static int slbt_lconf_trace_result_annotated(

	struct slbt_driver_ctx *	dctx,

	int				fd,

	int				fdat,

	const char *			lconf,

	int				err)

{

	int             fderr;

	const char *    cpath;

	char            path[PATH_MAX];

	fderr = slbt_driver_fderr(dctx);

	cpath = !(slbt_realpath(fdat,lconf,0,path,sizeof(path)))

		? path : lconf;

	switch (err) {

		case 0:

			slbt_dprintf(

				fderr,

				"%s%s%s%s: %s%s%s: found %s%s%c%s%c%s.\n",

				aclr_bold,aclr_magenta,

				dctx->program,

				aclr_reset,

				aclr_bold,

				"lconf",

				aclr_reset,

				aclr_bold,aclr_green,

				'"',cpath,'"',

				aclr_reset);

			return fd;

		case EXDEV:

			slbt_dprintf(

				fderr,

				"%s%s%s%s: %s%s%s: stopped in %s%s%c%s%c%s "

				"%s%s(config file not found on current device)%s.\n",

				aclr_bold,aclr_magenta,

				dctx->program,

				aclr_reset,

				aclr_bold,

				"lconf",

				aclr_reset,

				aclr_bold,aclr_green,

				'"',cpath,'"',

				aclr_reset,

				aclr_bold,aclr_red,

				aclr_reset);

			return -1;

		default:

			slbt_dprintf(

				fderr,

				"%s%s%s%s: %s%s%s: stopped in %s%s%c%s%c%s "

				"%s%s(top-level directory reached)%s.\n",

				aclr_bold,aclr_magenta,

				dctx->program,

				aclr_reset,

				aclr_bold,

				"lconf",

				aclr_reset,

				aclr_bold,aclr_green,

				'"',cpath,'"',

				aclr_reset,

				aclr_bold,aclr_red,

				aclr_reset);

			return -1;

	}

}

static int slbt_lconf_open(

	struct slbt_driver_ctx *	dctx,

	const char *			lconf)

{

	int		fderr;

	int		fdcwd;

	int		fdlconf;

	int		fdlconfdir;

	int		fdparent;

	struct stat	stcwd;

	struct stat	stparent;

	ino_t		stinode;

	int             (*trace_lconf)(struct slbt_driver_ctx *,

	                                const char *);

	int             (*trace_fstat)(struct slbt_driver_ctx *,

	                                int,const char *, struct stat *);

	int             (*trace_openat)(struct slbt_driver_ctx *,

	                                int,const char *,int,int);

	int             (*trace_result)(struct slbt_driver_ctx *,

	                                int,int,const char *,int);

	lconf      = lconf ? lconf : "libtool";

	fderr      = slbt_driver_fderr(dctx);

	fdcwd      = slbt_driver_fdcwd(dctx);

	fdlconfdir = fdcwd;

	if (dctx->cctx->drvflags & SLBT_DRIVER_SILENT) {

		trace_lconf  = 0;

		trace_fstat  = slbt_lconf_trace_fstat_silent;

		trace_openat = slbt_lconf_trace_openat_silent;

		trace_result = slbt_lconf_trace_result_silent;

	} else if (dctx->cctx->drvflags & SLBT_DRIVER_ANNOTATE_NEVER) {

		trace_lconf  = slbt_lconf_trace_lconf_plain;

		trace_fstat  = slbt_lconf_trace_fstat_plain;

		trace_openat = slbt_lconf_trace_openat_plain;

		trace_result = slbt_lconf_trace_result_plain;

	} else if (dctx->cctx->drvflags & SLBT_DRIVER_ANNOTATE_ALWAYS) {

		trace_lconf  = slbt_lconf_trace_lconf_annotated;

		trace_fstat  = slbt_lconf_trace_fstat_annotated;

		trace_openat = slbt_lconf_trace_openat_annotated;

		trace_result = slbt_lconf_trace_result_annotated;

	} else if (isatty(fderr)) {

		trace_lconf  = slbt_lconf_trace_lconf_annotated;

		trace_fstat  = slbt_lconf_trace_fstat_annotated;

		trace_openat = slbt_lconf_trace_openat_annotated;

		trace_result = slbt_lconf_trace_result_annotated;

	} else {

		trace_lconf  = slbt_lconf_trace_lconf_plain;

		trace_fstat  = slbt_lconf_trace_fstat_plain;

		trace_openat = slbt_lconf_trace_openat_plain;

		trace_result = slbt_lconf_trace_result_plain;

	}

	if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT)) {

		trace_lconf(dctx,lconf);

		slbt_output_fdcwd(dctx);

	}

	if (lconf && strchr(lconf,'/'))

		return ((fdlconf = trace_openat(dctx,fdcwd,lconf,O_RDONLY,0)) < 0)

			? SLBT_CUSTOM_ERROR(dctx,SLBT_ERR_LCONF_OPEN)

			: trace_result(dctx,fdlconf,fdcwd,lconf,0);

	if (trace_fstat(dctx,fdlconfdir,".",&stcwd) < 0)

		return SLBT_SYSTEM_ERROR(dctx,0);

	stinode = stcwd.st_ino;

	fdlconf = trace_openat(dctx,fdlconfdir,lconf,O_RDONLY,0);

	while (fdlconf < 0) {

		fdparent = trace_openat(dctx,fdlconfdir,"../",O_DIRECTORY,0);

		slbt_lconf_close(fdcwd,fdlconfdir);

		if (fdparent < 0)

			return SLBT_SYSTEM_ERROR(dctx,0);

		if (trace_fstat(dctx,fdparent,0,&stparent) < 0) {

			close(fdparent);

			return SLBT_SYSTEM_ERROR(dctx,0);

		}

		if (stparent.st_dev != stcwd.st_dev) {

			trace_result(dctx,fdparent,fdparent,".",EXDEV);

			close(fdparent);

			return SLBT_CUSTOM_ERROR(

				dctx,SLBT_ERR_LCONF_OPEN);

		}

		if (stparent.st_ino == stinode) {

			trace_result(dctx,fdparent,fdparent,".",ELOOP);

			close(fdparent);

			return SLBT_CUSTOM_ERROR(

				dctx,SLBT_ERR_LCONF_OPEN);

		}

		fdlconfdir = fdparent;

		fdlconf    = trace_openat(dctx,fdlconfdir,lconf,O_RDONLY,0);

		stinode    = stparent.st_ino;

	}

	trace_result(dctx,fdlconf,fdlconfdir,lconf,0);

	slbt_lconf_close(fdcwd,fdlconfdir);

	return fdlconf;

}

static int slbt_get_lconf_var(

	void *          addr,

	const char *    cap,

	const char *    var,

	char            (*val)[PATH_MAX])

{

	const char *    mark;

	const char *    match;

	ssize_t         len;

	/* init */

	len   = strlen(var);

	mark  = addr;

	match = 0;

	memset(*val,0,PATH_MAX);

	/* search for ^var= */

	for (; (mark < cap) && !match; ) {

		if ((cap - mark) <= len)

			return 0;

		if (!strncmp(mark,var,len)) {

			match = mark;

		} else {

			while ((*mark != '\n') && (mark < cap))

				mark++;

			while (isspace(*mark) && (mark < cap))

				mark++;

		}

	}

	/* not found? */

	if (mark == cap)

		return 0;

	/* support a single pair of double quotes */

	match = &match[len];

	mark  = match;

	if (match[0] == '"') {

		match++;

		mark++;

		for (; (*mark != '"') && (mark < cap); )

			mark++;

	} else {

		for (; !isspace(*mark) && (mark < cap); )

			mark++;

	}

	/* validate */

	if ((len = mark - match) >= PATH_MAX)

		return -1;

	/* copy and validate */

	strncpy(*val,match,len);

	for (mark=*val; *mark; mark++) {

		if ((*mark >= 'a') && (*mark <= 'z'))

			(void)0;

		else if ((*mark >= 'A') && (*mark <= 'Z'))

			(void)0;

		else if ((*mark >= '0') && (*mark <= '9'))

			(void)0;

		else if ((*mark == '+') || (*mark == '-'))

			(void)0;

		else if ((*mark == '/') || (*mark == '@'))

			(void)0;

		else if ((*mark == '.') || (*mark == '_'))

			(void)0;

		else

			return -1;

	}

	return 0;

}

int slbt_get_lconf_flags(

	struct slbt_driver_ctx *	dctx,

	const char *			lconf,

	uint64_t *			flags)

{

	struct slbt_driver_ctx_impl *   ctx;

	int				fdlconf;

	struct stat			st;

	void *				addr;

	const char *			mark;

	const char *			cap;

	uint64_t			optshared;

	uint64_t			optstatic;