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Add a small library to emulate tor_run_main() with exec()

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This commit is contained in:
Nick Mathewson 2017-10-18 19:34:19 -04:00
parent fa02ea102e
commit e8682c8594
4 changed files with 85 additions and 0 deletions
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1
.gitignore vendored
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@ -211,6 +211,7 @@ uptime-*.json
/src/test/fuzz/lf-fuzz-*
# /src/tools/
/src/tools/libtorrunner.a
/src/tools/tor-checkkey
/src/tools/tor-resolve
/src/tools/tor-cov-resolve

1
configure.ac
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@ -375,6 +375,7 @@ AH_BOTTOM([
AM_CONDITIONAL(BUILD_NT_SERVICES, test "x$bwin32" = "xtrue")
AM_CONDITIONAL(BUILD_LIBTORRUNNER, test "x$bwin32" != "xtrue")
dnl Enable C99 when compiling with MIPSpro
AC_MSG_CHECKING([for MIPSpro compiler])

5
src/tools/include.am
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@ -45,3 +45,8 @@ src_tools_tor_cov_gencert_LDADD = src/common/libor-testing.a \
endif
EXTRA_DIST += src/tools/tor-fw-helper/README
if BUILD_LIBTORRUNNER
noinst_LIBRARIES += src/tools/libtorrunner.a
src_tools_libtorrunner_a_SOURCES = src/tools/tor_runner.c src/or/tor_api.c
endif

78
src/tools/tor_runner.c Normal file
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@ -0,0 +1,78 @@
/* Copyright (c) 2001 Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2017, The Tor Project, Inc. */
/* See LICENSE for licensing information */
#include "tor_api.h"
#include "tor_api_internal.h"
#include "orconfig.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include <stdlib.h>
#include <string.h>
#ifndef __GNUC__
#define __attribute__(x)
#endif
static void child(const tor_main_configuration_t *cfg)
__attribute__((noreturn));
int
tor_run_main(const tor_main_configuration_t *cfg)
{
pid_t pid = fork();
if (pid == 0) {
child(cfg);
exit(0); /* Unreachable */
}
pid_t stopped_pid;
int status = 0;
do {
stopped_pid = waitpid(pid, &status, 0);
} while (stopped_pid == -1);
/* Note: these return values are not documented. No return value is
* documented! */
if (stopped_pid != pid) {
return -99999;
}
if (WIFSTOPPED(status)) {
return WEXITSTATUS(status);
}
if (WIFSIGNALED(status)) {
return -WTERMSIG(status);
}
return -999988;
}
static void
child(const tor_main_configuration_t *cfg)
{
/* XXXX Close unused file descriptors. */
char **args = calloc(cfg->argc+1, sizeof(char *));
memcpy(args, cfg->argv, cfg->argc * sizeof(char *));
args[cfg->argc] = NULL;
int rv = execv(BINDIR "/tor", args);
if (rv < 0) {
exit(254);
} else {
abort(); /* Unreachable */
}
}