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/*******************************************************************/
/* slibtool: a skinny libtool implementation, written in C */
/* Copyright (C) 2016--2024 SysDeer Technologies, LLC */
/* Released under the Standard MIT License; see COPYING.SLIBTOOL. */
/*******************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>
#include <slibtool/slibtool.h>
#include "slibtool_driver_impl.h"
#include "slibtool_errinfo_impl.h"
#include "slibtool_linkcmd_impl.h"
#include "slibtool_mapfile_impl.h"
#include "slibtool_metafile_impl.h"
#include "slibtool_realpath_impl.h"
#include "slibtool_snprintf_impl.h"
#include "slibtool_symlink_impl.h"
#include "slibtool_spawn_impl.h"
#include "slibtool_visibility_impl.h"
static int slbt_linkcmd_exit(
struct slbt_deps_meta * depsmeta,
int ret)
{
if (depsmeta->altv)
free(depsmeta->altv);
if (depsmeta->args)
free(depsmeta->args);
return ret;
}
static void slbt_emit_fdwrap_dl_path_fixup(
char * cwd,
char * dpfixup,
size_t dpfixup_size,
char * wrapper)
{
char * p;
char * q;
char * wrapper_dname;
/* obtain cwd-relative directory name of wrapper */
for (p=cwd,q=wrapper; *p && *q && (*p==*q); p++,q++)
(void)0;
wrapper_dname = (*q == '/') ? (q + 1) : q;
dpfixup[0] = 0; strncat(dpfixup,"${0%/*}",dpfixup_size - 1);
/* append parent directory fixup for each level of depth in wrapper_dname */
for (p=wrapper_dname,q=0; *p; ) {
if ((p[0] == '.') && (p[1] == '/')) {
p++; p++;
} else if ((q = strchr(p, '/'))) {
strncat(dpfixup,"/..",dpfixup_size-1); p = (q + 1);
} else {
break;
}
}
strncat(dpfixup,"/",dpfixup_size-1);
}
slbt_hidden int slbt_exec_link_create_executable(
const struct slbt_driver_ctx * dctx,
struct slbt_exec_ctx * ectx,
const char * exefilename)
{
int fdcwd;
int fdwrap;
char ** parg;
char ** xarg;
char * base;
char * ccwrap;
char cwd [PATH_MAX];
char dpfixup[PATH_MAX];
char output [PATH_MAX];
char wrapper[PATH_MAX];
char wraplnk[PATH_MAX];
bool fabspath;
bool fpic;
const struct slbt_source_version * verinfo;
struct slbt_deps_meta depsmeta = {0,0,0,0};
struct stat st;
/* initial state */
slbt_ectx_reset_arguments(ectx);
/* placeholders */
slbt_reset_placeholders(ectx);
/* fdcwd */
fdcwd = slbt_driver_fdcwd(dctx);
/* fpic */
fpic = (dctx->cctx->drvflags & SLBT_DRIVER_SHARED);
fpic &= !(dctx->cctx->drvflags & SLBT_DRIVER_PREFER_STATIC);
/* input argument adjustment */
for (parg=ectx->cargv; *parg; parg++)
slbt_adjust_object_argument(*parg,fpic,true,fdcwd);
/* linker argument adjustment */
for (parg=ectx->cargv, xarg=ectx->xargv; *parg; parg++, xarg++)
if (slbt_adjust_linker_argument(
dctx,
*parg,xarg,fpic,
dctx->cctx->settings.dsosuffix,
dctx->cctx->settings.arsuffix,
&depsmeta) < 0)
return SLBT_NESTED_ERROR(dctx);
/* --no-undefined */
if (dctx->cctx->drvflags & SLBT_DRIVER_NO_UNDEFINED)
*ectx->noundef = slbt_host_group_is_darwin(dctx)
? "-Wl,-undefined,error"
: "-Wl,--no-undefined";
/* executable wrapper: create */
if (slbt_snprintf(wrapper,sizeof(wrapper),
"%s.wrapper.tmp",
dctx->cctx->output) < 0)
return SLBT_BUFFER_ERROR(dctx);
if ((fdwrap = openat(fdcwd,wrapper,O_RDWR|O_CREAT|O_TRUNC,0644)) < 0)
return SLBT_SYSTEM_ERROR(dctx,wrapper);
slbt_exec_set_fdwrapper(ectx,fdwrap);
/* executable wrapper: header */
verinfo = slbt_api_source_version();
/* cwd, DL_PATH fixup */
if (slbt_realpath(fdcwd,".",O_DIRECTORY,cwd,sizeof(cwd)))
return SLBT_SYSTEM_ERROR(dctx,0);
slbt_emit_fdwrap_dl_path_fixup(
cwd,dpfixup,sizeof(dpfixup),
wrapper);
if (slbt_dprintf(fdwrap,
"#!/bin/sh\n"
"# libtool compatible executable wrapper\n"
"# Generated by %s (slibtool %d.%d.%d)\n"
"# [commit reference: %s]\n\n"
"if [ -z \"$%s\" ]; then\n"
"\tDL_PATH=\n"
"\tCOLON=\n"
"\tLCOLON=\n"
"else\n"
"\tDL_PATH=\n"
"\tCOLON=\n"
"\tLCOLON=':'\n"
"fi\n\n"
"DL_PATH_FIXUP=\"%s\";\n\n",
dctx->program,
verinfo->major,verinfo->minor,verinfo->revision,
verinfo->commit,
dctx->cctx->settings.ldpathenv,
dpfixup) < 0)
return SLBT_SYSTEM_ERROR(dctx,0);
/* output */
if (slbt_snprintf(output,sizeof(output),
"%s",exefilename) < 0)
return SLBT_BUFFER_ERROR(dctx);
*ectx->lout[0] = "-o";
*ectx->lout[1] = output;
/* static? */
if (dctx->cctx->drvflags & SLBT_DRIVER_ALL_STATIC)
*ectx->dpic = "-static";
/* .libs/libfoo.so --> -L.libs -lfoo */
if (slbt_exec_link_adjust_argument_vector(
dctx,ectx,&depsmeta,cwd,false))
return SLBT_NESTED_ERROR(dctx);
/* using alternate argument vector */
ccwrap = (char *)dctx->cctx->ccwrap;
ectx->argv = depsmeta.altv;
ectx->program = ccwrap ? ccwrap : depsmeta.altv[0];
/* executable wrapper symlink */
if (slbt_snprintf(wraplnk,sizeof(wraplnk),
"%s.exe.wrapper",
exefilename) < 0)
return slbt_linkcmd_exit(
&depsmeta,
SLBT_BUFFER_ERROR(dctx));
/* executable wrapper: base name */
base = strrchr(wraplnk,'/');
base++;
/* executable wrapper: footer */
fabspath = (exefilename[0] == '/');
if (slbt_dprintf(fdwrap,
"DL_PATH=\"${DL_PATH}${LCOLON}${%s}\"\n\n"
"export %s=\"$DL_PATH\"\n\n"
"if [ $(basename \"$0\") = \"%s\" ]; then\n"
"\tprogram=\"$1\"; shift\n"
"\texec \"$program\" \"$@\"\n"
"fi\n\n"
"exec %s/%s \"$@\"\n",
dctx->cctx->settings.ldpathenv,
dctx->cctx->settings.ldpathenv,
base,
fabspath ? "" : cwd,
fabspath ? &exefilename[1] : exefilename) < 0)
return slbt_linkcmd_exit(
&depsmeta,
SLBT_SYSTEM_ERROR(dctx,0));
/* sigh */
if (slbt_exec_link_finalize_argument_vector(dctx,ectx))
return SLBT_NESTED_ERROR(dctx);
/* step output */
if (!(dctx->cctx->drvflags & SLBT_DRIVER_SILENT))
if (slbt_output_link(ectx))
return slbt_linkcmd_exit(
&depsmeta,
SLBT_NESTED_ERROR(dctx));
/* spawn */
if ((slbt_spawn(ectx,true) < 0) && (ectx->pid < 0)) {
return slbt_linkcmd_exit(
&depsmeta,
SLBT_SPAWN_ERROR(dctx));
} else if (ectx->exitcode) {
return slbt_linkcmd_exit(
&depsmeta,
SLBT_CUSTOM_ERROR(
dctx,
SLBT_ERR_LINK_ERROR));
}
/* executable wrapper: finalize */
slbt_exec_close_fdwrapper(ectx);
if (slbt_create_symlink(
dctx,ectx,
dctx->cctx->output,wraplnk,
SLBT_SYMLINK_WRAPPER))
return slbt_linkcmd_exit(
&depsmeta,
SLBT_NESTED_ERROR(dctx));
if (fstatat(fdcwd,wrapper,&st,0))
return slbt_linkcmd_exit(
&depsmeta,
SLBT_SYSTEM_ERROR(dctx,wrapper));
if (renameat(fdcwd,wrapper,fdcwd,dctx->cctx->output))
return slbt_linkcmd_exit(
&depsmeta,
SLBT_SYSTEM_ERROR(dctx,dctx->cctx->output));
if (fchmodat(fdcwd,dctx->cctx->output,0755,0))
return slbt_linkcmd_exit(
&depsmeta,
SLBT_SYSTEM_ERROR(dctx,dctx->cctx->output));
return slbt_linkcmd_exit(&depsmeta,0);
}
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