Blame src/logic/linkcmd/slbt_linkcmd_dsolib.c

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/*******************************************************************/
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/*  slibtool: a skinny libtool implementation, written in C        */
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/*  Copyright (C) 2016--2024  SysDeer Technologies, LLC            */
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/*  Released under the Standard MIT License; see COPYING.SLIBTOOL. */
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/*******************************************************************/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <slibtool/slibtool.h>
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#include "slibtool_driver_impl.h"
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#include "slibtool_errinfo_impl.h"
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#include "slibtool_linkcmd_impl.h"
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#include "slibtool_mapfile_impl.h"
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#include "slibtool_metafile_impl.h"
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#include "slibtool_realpath_impl.h"
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#include "slibtool_snprintf_impl.h"
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#include "slibtool_symlink_impl.h"
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#include "slibtool_spawn_impl.h"
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#include "slibtool_visibility_impl.h"
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static int slbt_linkcmd_exit(
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	struct slbt_deps_meta *	depsmeta,
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	int			ret)
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{
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	if (depsmeta->altv)
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		free(depsmeta->altv);
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	if (depsmeta->args)
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		free(depsmeta->args);
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	return ret;
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}
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static int slbt_exec_link_remove_file(
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	const struct slbt_driver_ctx *	dctx,
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	struct slbt_exec_ctx *		ectx,
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	const char *			target)
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{
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	int fdcwd;
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	(void)ectx;
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	/* fdcwd */
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	fdcwd = slbt_driver_fdcwd(dctx);
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	/* remove target (if any) */
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	if (!unlinkat(fdcwd,target,0) || (errno == ENOENT))
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		return 0;
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	return SLBT_SYSTEM_ERROR(dctx,0);
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}
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static int slbt_exec_link_remove_dso_files(
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	const struct slbt_driver_ctx *	dctx,
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	struct slbt_exec_ctx *		ectx,
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	const char *			target)
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{
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	int fdcwd;
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	char * mark;
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	char * sbuf;
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	/* fdcwd */
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	fdcwd = slbt_driver_fdcwd(dctx);
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	/* remove target (if any) */
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	if (unlinkat(fdcwd,target,0) && (errno != ENOENT))
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		return SLBT_SYSTEM_ERROR(dctx,0);
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	/* remove a previous .disabled placeholder */
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	sbuf  = (slbt_get_exec_ictx(ectx))->sbuf;
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	mark  = sbuf;
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	mark += sprintf(mark,"%s",target);
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	strcpy(mark,".disabled");
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	if (unlinkat(fdcwd,sbuf,0) && (errno != ENOENT))
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		return SLBT_SYSTEM_ERROR(dctx,0);
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	return 0;
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}
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slbt_hidden int slbt_exec_link_create_library(
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	const struct slbt_driver_ctx *	dctx,
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	struct slbt_exec_ctx *		ectx,
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	const char *			dsobasename,
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	const char *			dsofilename,
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	const char *			relfilename,
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	bool                            fardlopen,
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	bool                            fpic)
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{
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	int                     fdcwd;
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	char **                 parg;
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	char **                 xarg;
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	char *	                ccwrap;
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	const char *            laout;
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	const char *            dot;
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	char                    cwd    [PATH_MAX];
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	char                    output [PATH_MAX];
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	char                    soname [PATH_MAX];
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	char                    symfile[PATH_MAX];
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	char                    mapfile[PATH_MAX];
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	struct slbt_deps_meta   depsmeta = {0,0,0,0};
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	/* initial state */
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	slbt_ectx_reset_arguments(ectx);
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	/* placeholders */
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	slbt_reset_placeholders(ectx);
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	/* fdcwd */
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	fdcwd = slbt_driver_fdcwd(dctx);
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	/* remove previous libfoo.so, libfoo.so.disabled */
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	if (slbt_exec_link_remove_dso_files(dctx,ectx,ectx->dsofilename) < 0)
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		return SLBT_NESTED_ERROR(dctx);
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	/* input argument adjustment */
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	for (parg=ectx->cargv; *parg; parg++)
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		slbt_adjust_object_argument(*parg,fpic,false,fdcwd);
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	/* .deps */
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	if (slbt_exec_link_create_dep_file(
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			dctx,ectx,ectx->cargv,
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			dsofilename,false))
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		return slbt_linkcmd_exit(
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			&depsmeta,
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			SLBT_NESTED_ERROR(dctx));
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	/* linker argument adjustment */
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	for (parg=ectx->cargv, xarg=ectx->xargv; *parg; parg++, xarg++)
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		if (slbt_adjust_linker_argument(
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				dctx,
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				*parg,xarg,true,
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				dctx->cctx->settings.dsosuffix,
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				dctx->cctx->settings.arsuffix,
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				&depsmeta) < 0)
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			return SLBT_NESTED_ERROR(dctx);
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	/* --no-undefined */
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	if (dctx->cctx->drvflags & SLBT_DRIVER_NO_UNDEFINED)
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		*ectx->noundef = slbt_host_group_is_darwin(dctx)
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			? "-Wl,-undefined,error"
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			: "-Wl,--no-undefined";
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	/* -soname */
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	dot   = strrchr(dctx->cctx->output,'.');
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	laout = (dot && !strcmp(dot,".la"))
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			? dctx->cctx->output
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			: 0;
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	char wl_soname[24];
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	if (slbt_host_group_is_darwin(dctx)) {
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		strcpy(wl_soname,"-Wl,-install_name");
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	} else {
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		strcpy(wl_soname,"-Wl,-soname");
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	}
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	if ((dctx->cctx->drvflags & SLBT_DRIVER_IMAGE_MACHO)) {
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		(void)0;
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	} else if (!laout && (dctx->cctx->drvflags & SLBT_DRIVER_MODULE)) {
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		if (slbt_snprintf(soname,sizeof(soname),
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				"-Wl,%s",dctx->cctx->output) < 0)
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			return SLBT_BUFFER_ERROR(dctx);
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		*ectx->soname  = wl_soname;
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		*ectx->lsoname = soname;
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	} else if (relfilename && dctx->cctx->verinfo.verinfo) {
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		if (slbt_snprintf(soname,sizeof(soname),
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					"-Wl,%s%s%s%s%s.%d%s",
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					ectx->sonameprefix,
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					dctx->cctx->libname,
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					dctx->cctx->release ? "-" : "",
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					dctx->cctx->release ? dctx->cctx->release : "",
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					dctx->cctx->settings.osdsuffix,
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					dctx->cctx->verinfo.major,
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					dctx->cctx->settings.osdfussix) < 0)
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			return SLBT_BUFFER_ERROR(dctx);
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		*ectx->soname  = wl_soname;
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		*ectx->lsoname = soname;
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	} else if (relfilename) {
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		if (slbt_snprintf(soname,sizeof(soname),
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					"-Wl,%s%s%s%s%s",
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					ectx->sonameprefix,
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					dctx->cctx->libname,
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					dctx->cctx->release ? "-" : "",
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					dctx->cctx->release ? dctx->cctx->release : "",
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					dctx->cctx->settings.dsosuffix) < 0)
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			return SLBT_BUFFER_ERROR(dctx);
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		*ectx->soname  = wl_soname;
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		*ectx->lsoname = soname;
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	} else if (dctx->cctx->drvflags & SLBT_DRIVER_AVOID_VERSION) {
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		if (slbt_snprintf(soname,sizeof(soname),
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					"-Wl,%s%s%s",
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					ectx->sonameprefix,
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					dctx->cctx->libname,
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					dctx->cctx->settings.dsosuffix) < 0)
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			return SLBT_BUFFER_ERROR(dctx);
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		*ectx->soname  = wl_soname;
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		*ectx->lsoname = soname;
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	} else {
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		if (slbt_snprintf(soname,sizeof(soname),
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					"-Wl,%s%s%s.%d%s",
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					ectx->sonameprefix,
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					dctx->cctx->libname,
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					dctx->cctx->settings.osdsuffix,
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					dctx->cctx->verinfo.major,
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					dctx->cctx->settings.osdfussix) < 0)
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			return SLBT_BUFFER_ERROR(dctx);
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		*ectx->soname  = wl_soname;
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		*ectx->lsoname = soname;
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	}
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	/* PE: --output-def */
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	if (dctx->cctx->drvflags & SLBT_DRIVER_IMAGE_PE) {
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		if (slbt_snprintf(symfile,sizeof(symfile),
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					"-Wl,%s",
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					ectx->deffilename) < 0)
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			return SLBT_BUFFER_ERROR(dctx);
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		*ectx->symdefs = "-Wl,--output-def";
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		*ectx->symfile = symfile;
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	}
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	/* -export-symbols */
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	if (dctx->cctx->expsyms) {
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		struct slbt_symlist_ctx * sctx;
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		sctx = (slbt_get_exec_ictx(ectx))->sctx;
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		if (slbt_util_create_mapfile(sctx,ectx->mapfilename,0644) < 0)
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			return SLBT_NESTED_ERROR(dctx);
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		if (slbt_snprintf(mapfile,sizeof(mapfile),
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					"-Wl,%s",
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					ectx->mapfilename) < 0)
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			return SLBT_BUFFER_ERROR(dctx);
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		if (slbt_host_group_is_darwin(dctx)) {
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			*ectx->explarg = "-Wl,-exported_symbols_list";
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			*ectx->expsyms = mapfile;
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		} else if (slbt_host_group_is_winnt(dctx)) {
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			*ectx->expsyms = mapfile;
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		} else {
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			*ectx->explarg = "-Wl,--version-script";
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			*ectx->expsyms = mapfile;
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		}
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	}
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	/* -export-symbols-regex; and see also:     */
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	/* slbt_exec_link_create_expsyms_archive() */
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	if (dctx->cctx->regex) {
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		if (slbt_snprintf(mapfile,sizeof(mapfile),
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					"-Wl,%s",
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					ectx->mapfilename) < 0)
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			return SLBT_BUFFER_ERROR(dctx);
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		if (slbt_host_group_is_darwin(dctx)) {
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			*ectx->explarg = "-Wl,-exported_symbols_list";
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			*ectx->expsyms = mapfile;
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		} else if (slbt_host_group_is_winnt(dctx)) {
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			*ectx->expsyms = mapfile;
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		} else {
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			*ectx->explarg = "-Wl,--version-script";
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			*ectx->expsyms = mapfile;
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		}
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	}
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	/* shared/static */
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	if (dctx->cctx->drvflags & SLBT_DRIVER_ALL_STATIC) {
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		*ectx->dpic = "-static";
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	} else if (dctx->cctx->settings.picswitch) {
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		*ectx->dpic = "-shared";
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		*ectx->fpic = dctx->cctx->settings.picswitch;
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	} else {
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		*ectx->dpic = "-shared";
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	}
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	/* output */
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	if (!laout && dctx->cctx->drvflags & SLBT_DRIVER_MODULE) {
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		strcpy(output,dctx->cctx->output);
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	} else if (relfilename) {
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		strcpy(output,relfilename);
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	} else if (dctx->cctx->drvflags & SLBT_DRIVER_AVOID_VERSION) {
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		strcpy(output,dsofilename);
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	} else {
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		if (slbt_snprintf(output,sizeof(output),
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					"%s%s.%d.%d.%d%s",
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					dsobasename,
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					dctx->cctx->settings.osdsuffix,
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					dctx->cctx->verinfo.major,
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					dctx->cctx->verinfo.minor,
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					dctx->cctx->verinfo.revision,
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					dctx->cctx->settings.osdfussix) < 0)
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			return SLBT_BUFFER_ERROR(dctx);
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	}
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	/* output marks */
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	*ectx->lout[0] = "-o";
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	*ectx->lout[1] = output;
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	/* ldrpath */
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	if (dctx->cctx->host.ldrpath) {
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		if (slbt_exec_link_remove_file(dctx,ectx,ectx->rpathfilename))
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			return SLBT_NESTED_ERROR(dctx);
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		if (slbt_create_symlink(
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				dctx,ectx,
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				dctx->cctx->host.ldrpath,
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				ectx->rpathfilename,
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				SLBT_SYMLINK_LITERAL))
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			return SLBT_NESTED_ERROR(dctx);
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	}
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	/* cwd */
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	if (slbt_realpath(fdcwd,".",O_DIRECTORY,cwd,sizeof(cwd)))
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		return SLBT_SYSTEM_ERROR(dctx,0);
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	/* .libs/libfoo.so --> -L.libs -lfoo */
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	if (slbt_exec_link_adjust_argument_vector(
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			dctx,ectx,&depsmeta,cwd,true))
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		return SLBT_NESTED_ERROR(dctx);
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	/* using alternate argument vector */
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	ccwrap        = (char *)dctx->cctx->ccwrap;
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	ectx->argv    = depsmeta.altv;
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	ectx->program = ccwrap ? ccwrap : depsmeta.altv[0];
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	/* sigh */
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	if (slbt_exec_link_finalize_argument_vector(dctx,ectx))
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		return SLBT_NESTED_ERROR(dctx);
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	/* all done? */
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	if (fardlopen)
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		return 0;
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	/* step output */
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	if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT))
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		if (slbt_output_link(ectx))
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			return slbt_linkcmd_exit(
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				&depsmeta,
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				SLBT_NESTED_ERROR(dctx));
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	/* spawn */
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	if ((slbt_spawn(ectx,true) < 0) && (ectx->pid < 0)) {
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		return slbt_linkcmd_exit(
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			&depsmeta,
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			SLBT_SPAWN_ERROR(dctx));
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	} else if (ectx->exitcode) {
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		return slbt_linkcmd_exit(
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			&depsmeta,
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			SLBT_CUSTOM_ERROR(
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				dctx,
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				SLBT_ERR_LINK_ERROR));
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	}
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	return slbt_linkcmd_exit(&depsmeta,0);
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}