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-rw-r--r--src/logic/linkcmd/slbt_linkcmd_executable.c273
1 files changed, 273 insertions, 0 deletions
diff --git a/src/logic/linkcmd/slbt_linkcmd_executable.c b/src/logic/linkcmd/slbt_linkcmd_executable.c
new file mode 100644
index 0000000..a602c8e
--- /dev/null
+++ b/src/logic/linkcmd/slbt_linkcmd_executable.c
@@ -0,0 +1,273 @@
+/*******************************************************************/
+/* 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 <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_spawn_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);
+}
+
+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_reset_arguments(ectx);
+
+ /* placeholders */
+ slbt_reset_placeholders(ectx);
+
+ /* fdcwd */
+ fdcwd = slbt_driver_fdcwd(dctx);
+
+ /* fpic */
+ fpic = !(dctx->cctx->drvflags & SLBT_DRIVER_ALL_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,true,
+ 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 = "-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_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(dctx,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);
+}