169 lines
3.9 KiB
C
169 lines
3.9 KiB
C
/*-
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* Copyright (c) 2003 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Matthias Scheler.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <xbps_api.h>
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static int vfcexec(const char *, int, const char *, va_list);
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static int pfcexec(const char *, const char *, const char **);
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/*
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* Fork, then if /bin/sh exists change root directory to
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* path; otherwise just change current working directory.
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* Execute the command and arguments in the argv array.
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* wait for the command to finish, then return the exit status.
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*/
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static int
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pfcexec(const char *path, const char *file, const char **argv)
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{
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pid_t child;
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int status;
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child = vfork();
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switch (child) {
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case 0:
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if (path != NULL) {
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/*
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* If root and /bin/sh exists chroot to
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* destdir and exec the command. Otherwise
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* just change CWD to destdir.
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*/
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if (getuid() == 0 && access("./bin/sh", R_OK) == 0) {
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if (chroot(path) == -1)
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_exit(127);
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if (chdir("/") == -1)
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_exit(127);
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} else {
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if (chdir(path) == -1)
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_exit(127);
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}
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}
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(void)execvp(file, (char ** const)__UNCONST(argv));
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_exit(127);
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/* NOTREACHED */
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case -1:
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return -1;
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}
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while (waitpid(child, &status, 0) < 0) {
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if (errno != EINTR)
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return -1;
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}
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if (!WIFEXITED(status))
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return -1;
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return WEXITSTATUS(status);
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}
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static int
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vfcexec(const char *path, int skipempty, const char *arg, va_list ap)
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{
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const char **argv;
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size_t argv_size, argc;
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int retval;
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argv_size = 16;
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if ((argv = malloc(argv_size * sizeof(*argv))) == NULL) {
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errno = ENOMEM;
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return -1;
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}
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argv[0] = arg;
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argc = 1;
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do {
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if (argc == argv_size) {
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argv_size *= 2;
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argv = realloc(argv, argv_size * sizeof(*argv));
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if (argv == NULL) {
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errno = ENOMEM;
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return -1;
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}
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}
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arg = va_arg(ap, const char *);
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if (skipempty && arg && strlen(arg) == 0)
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continue;
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argv[argc++] = arg;
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} while (arg != NULL);
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retval = pfcexec(path, argv[0], argv);
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free(argv);
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return retval;
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}
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int
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xbps_file_exec(const char *arg, ...)
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{
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va_list ap;
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int result;
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va_start(ap, arg);
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result = vfcexec(NULL, 0, arg, ap);
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va_end(ap);
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return result;
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}
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int
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xbps_file_exec_skipempty(const char *arg, ...)
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{
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va_list ap;
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int result;
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va_start(ap, arg);
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result = vfcexec(NULL, 1, arg, ap);
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va_end(ap);
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return result;
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}
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int
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xbps_file_chdir_exec(const char *path, const char *arg, ...)
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{
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va_list ap;
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int result;
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va_start(ap, arg);
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result = vfcexec(path, 0, arg, ap);
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va_end(ap);
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return result;
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}
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