/*******************************************************************/
/* 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 <stdarg.h>
#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_snprintf_impl.h"
#include "slibtool_symlink_impl.h"
#include "slibtool_readlink_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 int slbt_emit_fdwrap_amend_dl_path(
const struct slbt_driver_ctx * dctx,
struct slbt_exec_ctx * ectx,
struct slbt_deps_meta * depsmeta,
const char * fmt,
...)
{
va_list ap;
char * buf;
int cnt;
char dlpathbuf[2048];
int fdwrap;
const char * fdwrap_fmt;
int size;
va_start(ap,fmt);
size = sizeof(dlpathbuf);
buf = ((cnt = vsnprintf(dlpathbuf,size,fmt,ap)) < size)
? dlpathbuf : malloc((size = cnt + 1));
va_end(ap);
if (buf == dlpathbuf) {
(void)0;
} else if (buf) {
va_start(ap,fmt);
vsprintf(buf,fmt,ap);
va_end(ap);
} else {
return slbt_linkcmd_exit(
depsmeta,
SLBT_SYSTEM_ERROR(dctx,0));
}
if ((fdwrap = slbt_exec_get_fdwrapper(ectx)) >= 0) {
if (buf[0] == '/') {
fdwrap_fmt =
"DL_PATH=\"${DL_PATH}${COLON}%s\"\n"
"COLON=':'\n\n";
} else {
fdwrap_fmt =
"DL_PATH=\"${DL_PATH}${COLON}${DL_PATH_FIXUP}%s\"\n"
"COLON=':'\n\n";
}
if (slbt_dprintf(fdwrap,fdwrap_fmt,buf) < 0) {
return slbt_linkcmd_exit(
depsmeta,
SLBT_SYSTEM_ERROR(dctx,0));
}
}
return 0;
}
bool slbt_adjust_object_argument(
char * arg,
bool fpic,
bool fany,
int fdcwd)
{
char * slash;
char * dot;
char base[PATH_MAX];
if (*arg == '-')
return false;
/* object argument: foo.lo or foo.o */
if (!(dot = strrchr(arg,'.')))
return false;
if ((dot[1]=='l') && (dot[2]=='o') && !dot[3]) {
dot[1] = 'o';
dot[2] = 0;
} else if ((dot[1]=='o') && !dot[2]) {
(void)0;
} else {
return false;
}
/* foo.o requested and is present? */
if (!fpic && !faccessat(fdcwd,arg,0,0))
return true;
/* .libs/foo.o */
if ((slash = strrchr(arg,'/')))
slash++;
else
slash = arg;
if (slbt_snprintf(base,sizeof(base),
"%s",slash) < 0)
return false;
sprintf(slash,".libs/%s",base);
if (!faccessat(fdcwd,arg,0,0))
return true;
/* foo.o requested and neither is present? */
if (!fpic) {
strcpy(slash,base);
return true;
}
/* .libs/foo.o explicitly requested and is not present? */
if (!fany)
return true;
/* use foo.o in place of .libs/foo.o */
strcpy(slash,base);
if (faccessat(fdcwd,arg,0,0))
sprintf(slash,".libs/%s",base);
return true;
}
bool slbt_adjust_wrapper_argument(
char * arg,
bool fpic)
{
char * slash;
char * dot;
char base[PATH_MAX];
if (*arg == '-')
return false;
if (!(dot = strrchr(arg,'.')))
return false;
if (strcmp(dot,".la"))
return false;
if (fpic) {
if ((slash = strrchr(arg,'/')))
slash++;
else
slash = arg;
if (slbt_snprintf(base,sizeof(base),
"%s",slash) < 0)
return false;
sprintf(slash,".libs/%s",base);
dot = strrchr(arg,'.');
}
strcpy(dot,".a");
return true;
}
int slbt_adjust_linker_argument(
const struct slbt_driver_ctx * dctx,
char * arg,
char ** xarg,
bool fpic,
const char * dsosuffix,
const char * arsuffix,
struct slbt_deps_meta * depsmeta)
{
int fdcwd;
int fdlib;
char * slash;
char * dot;
char base[PATH_MAX];
if (*arg == '-')
return 0;
if (!(dot = strrchr(arg,'.')))
return 0;
if (!(strcmp(dot,arsuffix))) {
*xarg = arg;
return slbt_get_deps_meta(dctx,arg,1,depsmeta);
}
if (!(strcmp(dot,dsosuffix)))
return slbt_get_deps_meta(dctx,arg,1,depsmeta);
if (strcmp(dot,".la"))
return 0;
if (fpic) {
if ((slash = strrchr(arg,'/')))
slash++;
else
slash = arg;
if (slbt_snprintf(base,sizeof(base),
"%s",slash) < 0)
return 0;
sprintf(slash,".libs/%s",base);
dot = strrchr(arg,'.');
}
/* fdcwd */
fdcwd = slbt_driver_fdcwd(dctx);
/* shared library dependency? */
if (fpic) {
sprintf(dot,"%s",dsosuffix);
if (slbt_symlink_is_a_placeholder(fdcwd,arg))
sprintf(dot,"%s",arsuffix);
else if ((fdlib = openat(fdcwd,arg,O_RDONLY)) >= 0)
close(fdlib);
else
sprintf(dot,"%s",arsuffix);
return slbt_get_deps_meta(dctx,arg,0,depsmeta);
}
/* input archive */
sprintf(dot,"%s",arsuffix);
return slbt_get_deps_meta(dctx,arg,0,depsmeta);
}
int slbt_exec_link_adjust_argument_vector(
const struct slbt_driver_ctx * dctx,
struct slbt_exec_ctx * ectx,
struct slbt_deps_meta * depsmeta,
const char * cwd,
bool flibrary)
{
int fd;
int fdcwd;
char ** carg;
char ** aarg;
char * ldir;
char * slash;
char * mark;
char * darg;
char * dot;
char * base;
char * dpath;
int argc;
char arg[PATH_MAX];
char lib[PATH_MAX];
char depdir [PATH_MAX];
char rpathdir[PATH_MAX];
char rpathlnk[PATH_MAX];
struct stat st;
size_t size;
size_t dlen;
struct slbt_map_info * mapinfo;
bool fwholearchive = false;
int ret;
for (argc=0,carg=ectx->cargv; *carg; carg++)
argc++;
if (!(depsmeta->args = calloc(1,depsmeta->infolen)))
return SLBT_SYSTEM_ERROR(dctx,0);
argc *= 3;
argc += depsmeta->depscnt;
if (!(depsmeta->altv = calloc(argc,sizeof(char *))))
return slbt_linkcmd_exit(
depsmeta,
SLBT_SYSTEM_ERROR(dctx,0));
fdcwd = slbt_driver_fdcwd(dctx);
carg = ectx->cargv;
aarg = depsmeta->altv;
darg = depsmeta->args;
size = depsmeta->infolen;
for (; *carg; ) {
dpath = 0;
if (!strcmp(*carg,"-Wl,--whole-archive"))
fwholearchive = true;
else if (!strcmp(*carg,"-Wl,--no-whole-archive"))
fwholearchive = false;
/* output annotation */
if (carg == ectx->lout[0]) {
ectx->mout[0] = &aarg[0];
ectx->mout[1] = &aarg[1];
}
/* argument translation */
mark = *carg;
if ((mark[0] == '-') && (mark[1] == 'L')) {
if (mark[2]) {
ldir = &mark[2];
} else {
*aarg++ = *carg++;
ldir = *carg;
}
mark = ldir + strlen(ldir);
if (mark[-1] == '/')
strcpy(mark,".libs");
else
strcpy(mark,"/.libs");
if ((fd = openat(fdcwd,ldir,O_DIRECTORY,0)) < 0)
*mark = 0;
else {
close(fd);
if ((ret = slbt_emit_fdwrap_amend_dl_path(
dctx,ectx,depsmeta,
"%s",ldir)) < 0)
return ret;
}
*aarg++ = *carg++;
} else if (**carg == '-') {
*aarg++ = *carg++;
} else if (!(dot = strrchr(*carg,'.'))) {
*aarg++ = *carg++;
} else if (ectx->xargv[carg - ectx->cargv]) {
*aarg++ = *carg++;
} else if (!(strcmp(dot,".a"))) {
if (flibrary && !fwholearchive)
*aarg++ = "-Wl,--whole-archive";
dpath = lib;
sprintf(lib,"%s.slibtool.deps",*carg);
*aarg++ = *carg++;
if (flibrary && !fwholearchive)
*aarg++ = "-Wl,--no-whole-archive";
} else if (strcmp(dot,dctx->cctx->settings.dsosuffix)) {
*aarg++ = *carg++;
} else if (carg == ectx->lout[1]) {
/* ^^^hoppla^^^ */
*aarg++ = *carg++;
} else {
/* -rpath */
sprintf(rpathlnk,"%s.slibtool.rpath",*carg);
if (!fstatat(fdcwd,rpathlnk,&st,AT_SYMLINK_NOFOLLOW)) {
if (slbt_readlinkat(
fdcwd,
rpathlnk,
rpathdir,
sizeof(rpathdir)))
return slbt_linkcmd_exit(
depsmeta,
SLBT_SYSTEM_ERROR(dctx,rpathlnk));
sprintf(darg,"-Wl,%s",rpathdir);
*aarg++ = "-Wl,-rpath";
*aarg++ = darg;
darg += strlen(darg);
darg++;
}
dpath = lib;
sprintf(lib,"%s.slibtool.deps",*carg);
/* account for {'-','L','-','l'} */
if (slbt_snprintf(arg,
sizeof(arg) - 4,
"%s",*carg) < 0)
return slbt_linkcmd_exit(
depsmeta,
SLBT_BUFFER_ERROR(dctx));
if ((slash = strrchr(arg,'/'))) {
sprintf(*carg,"-L%s",arg);
mark = strrchr(*carg,'/');
*mark = 0;
*slash = 0;
if ((ret = slbt_emit_fdwrap_amend_dl_path(
dctx,ectx,depsmeta,
"%s%s%s",
((arg[0] == '/') ? "" : cwd),
((arg[0] == '/') ? "" : "/"),
arg)) < 0) {
return ret;
}
dlen = strlen(dctx->cctx->settings.dsoprefix);
/* -module? (todo: non-portable usage, display warning) */
if (strncmp(++slash,dctx->cctx->settings.dsoprefix,dlen)) {
*--slash = '/';
strcpy(*carg,arg);
*aarg++ = *carg++;
} else {
*aarg++ = *carg++;
*aarg++ = ++mark;
slash += dlen;
sprintf(mark,"-l%s",slash);
dot = strrchr(mark,'.');
*dot = 0;
}
} else {
*aarg++ = *carg++;
}
}
if (dpath && !fstatat(fdcwd,dpath,&st,0)) {
if (!(mapinfo = slbt_map_file(
fdcwd,dpath,
SLBT_MAP_INPUT)))
return slbt_linkcmd_exit(
depsmeta,
SLBT_SYSTEM_ERROR(dctx,dpath));
if (!(strncmp(lib,".libs/",6))) {
*aarg++ = "-L.libs";
lib[1] = 0;
} else if ((base = strrchr(lib,'/'))) {
if (base - lib == 5) {
if (!(strncmp(&base[-5],".libs/",6)))
base -= 4;
} else if (base - lib >= 6) {
if (!(strncmp(&base[-6],"/.libs/",7)))
base -= 6;
}
*base = 0;
} else {
lib[0] = '.';
lib[1] = 0;
}
while (mapinfo->mark < mapinfo->cap) {
if (slbt_mapped_readline(dctx,mapinfo,darg,size))
return slbt_linkcmd_exit(
depsmeta,
SLBT_NESTED_ERROR(dctx));
*aarg++ = darg;
mark = darg;
dlen = strlen(darg);
size -= dlen;
darg += dlen;
darg[-1] = 0;
/* handle -L... as needed */
if ((mark[0] == '-')
&& (mark[1] == 'L')
&& (mark[2] != '/')) {
if (strlen(mark) >= sizeof(depdir) - 1)
return slbt_linkcmd_exit(
depsmeta,
SLBT_BUFFER_ERROR(dctx));
darg = mark;
strcpy(depdir,&mark[2]);
sprintf(darg,"-L%s/%s",lib,depdir);
darg += strlen(darg);
darg++;
if ((ret = slbt_emit_fdwrap_amend_dl_path(
dctx,ectx,depsmeta,
"%s/%s",lib,depdir)) < 0)
return ret;
} else if ((mark[0] == '-') && (mark[1] == 'L')) {
if ((ret = slbt_emit_fdwrap_amend_dl_path(
dctx,ectx,depsmeta,
"%s",&mark[2])) < 0)
return ret;
}
}
}
}
if (dctx->cctx->drvflags & SLBT_DRIVER_EXPORT_DYNAMIC)
*aarg++ = "-Wl,--export-dynamic";
return 0;
}
int slbt_exec_link_finalize_argument_vector(
const struct slbt_driver_ctx * dctx,
struct slbt_exec_ctx * ectx)
{
char * sargv[1024];
char ** sargvbuf;
char ** base;
char ** parg;
char ** aarg;
char ** oarg;
char ** larg;
char ** darg;
char ** earg;
char ** rarg;
char ** aargv;
char ** oargv;
char ** cap;
char ** src;
char ** dst;
char * arg;
char * dot;
char * ccwrap;
const char * arsuffix;
/* vector size */
base = ectx->argv;
arsuffix = dctx->cctx->settings.arsuffix;
for (parg=base; *parg; parg++)
(void)0;
/* buffer */
if (parg - base < 512) {
aargv = &sargv[0];
oargv = &sargv[512];
aarg = aargv;
oarg = oargv;
sargvbuf = 0;
} else if (!(sargvbuf = calloc(2*(parg-base+1),sizeof(char *)))) {
return SLBT_SYSTEM_ERROR(dctx,0);
} else {
aargv = &sargvbuf[0];
oargv = &sargvbuf[parg-base+1];
aarg = aargv;
oarg = oargv;
}
/* (program name) */
parg = &base[1];
/* split object args from all other args, record output */
/* annotation, and remove redundant -l arguments */
for (; *parg; ) {
if (ectx->lout[0] == parg) {
ectx->lout[0] = &aarg[0];
ectx->lout[1] = &aarg[1];
}
if (ectx->mout[0] == parg) {
ectx->mout[0] = &aarg[0];
ectx->mout[1] = &aarg[1];
}
arg = *parg;
dot = strrchr(arg,'.');
/* object input argument? */
if (dot && (!strcmp(dot,".o") || !strcmp(dot,".lo"))) {
*oarg++ = *parg++;
/* --whole-archive input argument? */
} else if ((arg[0] == '-')
&& (arg[1] == 'W')
&& (arg[2] == 'l')
&& (arg[3] == ',')
&& !strcmp(&arg[4],"--whole-archive")
&& parg[1] && parg[2]
&& !strcmp(parg[2],"-Wl,--no-whole-archive")
&& (dot = strrchr(parg[1],'.'))
&& !strcmp(dot,arsuffix)) {
*oarg++ = *parg++;
*oarg++ = *parg++;
*oarg++ = *parg++;
/* local archive input argument? */
} else if (dot && !strcmp(dot,arsuffix)) {
*oarg++ = *parg++;
/* -l argument? */
} else if ((parg[0][0] == '-') && (parg[0][1] == 'l')) {
/* find the previous occurence of this -l argument */
for (rarg=0, larg=&aarg[-1]; !rarg && (larg>=aargv); larg--)
if (!strcmp(*larg,*parg))
rarg = larg;
/* first occurence of this specific -l argument? */
if (!rarg) {
*aarg++ = *parg++;
} else {
larg = rarg;
/* if all -l arguments following the previous */
/* occurence had already appeared before the */
/* previous argument, then the current */
/* occurence is redundant. */
for (darg=&larg[1]; rarg && darg<aarg; darg++) {
/* only test -l arguments */
if ((darg[0][0] == '-') && (darg[0][1] == 'l')) {
for (rarg=0, earg=aargv; !rarg && earg<larg; earg++)
if (!strcmp(*earg,*darg))
rarg = darg;
}
}
/* final verdict: repeated -l argument? */
if (rarg) {
parg++;
} else {
*aarg++ = *parg++;
}
}
/* -L argument? */
} else if ((parg[0][0] == '-') && (parg[0][1] == 'L')) {
/* find a previous occurence of this -L argument */
for (rarg=0, larg=aargv; !rarg && (larg<aarg); larg++)
if (!strcmp(*larg,*parg))
rarg = larg;
/* repeated -L argument? */
if (rarg) {
parg++;
} else {
*aarg++ = *parg++;
}
/* placeholder argument? */
} else if (!strncmp(*parg,"-USLIBTOOL_PLACEHOLDER_",23)) {
parg++;
/* all other arguments */
} else {
*aarg++ = *parg++;
}
}
/* program name, ccwrap */
if ((ccwrap = (char *)dctx->cctx->ccwrap)) {
base[1] = base[0];
base[0] = ccwrap;
base++;
}
/* join object args */
src = oargv;
cap = oarg;
dst = &base[1];
for (; src<cap; )
*dst++ = *src++;
/* join all other args */
src = aargv;
cap = aarg;
for (; src<cap; )
*dst++ = *src++;
/* properly null-terminate argv, accounting for redundant -l arguments */
*dst = 0;
/* output annotation */
if (ectx->lout[0]) {
ectx->lout[0] = &base[1] + (oarg - oargv) + (ectx->lout[0] - aargv);
ectx->lout[1] = ectx->lout[0] + 1;
}
if (ectx->mout[0]) {
ectx->mout[0] = &base[1] + (oarg - oargv) + (ectx->mout[0] - aargv);
ectx->mout[1] = ectx->mout[0] + 1;
}
/* all done */
if (sargvbuf)
free(sargvbuf);
return 0;
}