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

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

/*  Copyright (C) 2016--2018  Z. Gilboa                            */

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

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

#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;

}

int slbt_get_lconf_flags(

	struct slbt_driver_ctx *	dctx,

	const char *			lconf,

	uint64_t *			flags)

{

	int				fdlconf;

	struct stat			st;

	void *				addr;

	const char *			mark;

	const char *			cap;

	uint64_t			optshared;

	uint64_t			optstatic;

	int				optlenmax;

	int				optsharedlen;

	int				optstaticlen;

	const char *			optsharedstr;

	const char *			optstaticstr;

	/* open relative libtool script */

	if ((fdlconf = slbt_lconf_open(dctx,lconf)) < 0)

		return SLBT_NESTED_ERROR(dctx);

	/* map relative libtool script */

	if (fstat(fdlconf,&st) < 0)

		return SLBT_SYSTEM_ERROR(dctx,0);

	addr = mmap(

		0,st.st_size,

		PROT_READ,MAP_SHARED,

		fdlconf,0);

	close(fdlconf);

	if (addr == MAP_FAILED)

		return SLBT_CUSTOM_ERROR(

			dctx,SLBT_ERR_LCONF_MAP);

	mark = addr;

	cap  = &mark[st.st_size];

	/* hard-coded options in the generated libtool precede the code */

	if (st.st_size >= (optlenmax = strlen("build_libtool_libs=yes\n")))

		cap -= optlenmax;

	/* scan */

	optshared = 0;

	optstatic = 0;

	optsharedstr = "build_libtool_libs=";

	optstaticstr = "build_old_libs=";

	optsharedlen = strlen(optsharedstr);

	optstaticlen = strlen(optstaticstr);

	for (; mark && mark

		if (!strncmp(mark,optsharedstr,optsharedlen)) {

			mark += optsharedlen;

			if ((mark[0]=='n')

					&& (mark[1]=='o')

					&& (mark[2]=='\n'))

				optshared = SLBT_DRIVER_DISABLE_SHARED;

			if ((mark[0]=='y')

					&& (mark[1]=='e')

					&& (mark[2]=='s')

					&& (mark[3]=='\n'))

				optshared = SLBT_DRIVER_SHARED;

		} if (!strncmp(mark,optstaticstr,optstaticlen)) {

			mark += optstaticlen;

			if ((mark[0]=='n')

					&& (mark[1]=='o')

					&& (mark[2]=='\n'))

				optstatic = SLBT_DRIVER_DISABLE_STATIC;

			if ((mark[0]=='y')

					&& (mark[1]=='e')

					&& (mark[2]=='s')

					&& (mark[3]=='\n'))

				optstatic = SLBT_DRIVER_STATIC;

		}

		if (optshared && optstatic)

			mark = 0;

		else {

			for (; (mark

				mark++;

			mark++;

		}

	}

	munmap(addr,st.st_size);

	if (!optshared || !optstatic)

		return SLBT_CUSTOM_ERROR(

			dctx,SLBT_ERR_LCONF_PARSE);

	*flags = optshared | optstatic;