--- /dev/null
+// $Id: chroot-sh.c,v 1.2 2005/07/03 17:40:15 ensc Exp $ --*- c -*--
+
+// Copyright (C) 2005 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; version 2 of the License.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <lib_internal/util.h>
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#define ENSC_WRAPPERS_PREFIX "chroot-sh"
+#define ENSC_WRAPPERS_UNISTD 1
+#define ENSC_WRAPPERS_IO 1
+#define ENSC_WRAPPERS_FCNTL 1
+#include <ensc_wrappers/wrappers.h>
+
+int wrapper_exit_code = EXIT_FAILURE;
+
+static void
+showFD(int fd_in, int fd_out)
+{
+ for (;;) {
+ char buf[4096];
+ char const * ptr=buf;
+ ssize_t len;
+
+ len = Eread(fd_in, buf, sizeof(buf));
+ if (len<=0) break;
+
+ EwriteAll(fd_out, ptr, len);
+ }
+}
+
+static int
+redirectFileInternal(int argc, char *argv[],
+ int mode, bool is_input,
+ char const *operation)
+{
+ int fd;
+
+ if (argc<2) {
+ WRITE_MSG(2, "Not enough parameters for '");
+ WRITE_STR(2, operation);
+ WRITE_MSG(2, "' operation; use '--help' for more information\n");
+ return wrapper_exit_code;
+ }
+
+ fd = EopenD(argv[1], mode, 0644);
+ if (is_input) showFD(fd, 1);
+ else showFD( 0, fd);
+ Eclose(fd);
+
+ return EXIT_SUCCESS;
+}
+
+static mode_t
+testInternal(int argc, char *argv[], char const *operation)
+{
+ struct stat st;
+
+ if (argc<2) {
+ WRITE_MSG(2, "Not enough parameters for '");
+ WRITE_STR(2, operation);
+ WRITE_MSG(2, "' operation; use '--help' for more information\n");
+ return wrapper_exit_code;
+ }
+
+ if (stat(argv[1], &st)==-1) return 0;
+ else return st.st_mode;
+}
+
+static int
+execCat(int argc, char *argv[])
+{
+ return redirectFileInternal(argc, argv,
+ O_RDONLY|O_NOCTTY, true,
+ "cat");
+}
+
+static int
+execAppend(int argc, char *argv[])
+{
+ return redirectFileInternal(argc, argv,
+ O_WRONLY|O_CREAT|O_APPEND, false,
+ "append");
+}
+
+static int
+execTruncate(int argc, char *argv[])
+{
+ return redirectFileInternal(argc, argv,
+ O_WRONLY|O_CREAT|O_TRUNC, false,
+ "truncate");
+}
+
+static int
+execRm(int argc, char *argv[])
+{
+ int i = 1;
+ int res = EXIT_SUCCESS;
+
+ if (argc<2) {
+ WRITE_MSG(2, "No files specified for 'rm' operation; try '--help' for more information\n");
+ return wrapper_exit_code;
+ }
+
+ for (;i<argc; ++i) {
+ if (unlink(argv[i])==-1) {
+ PERROR_Q(ENSC_WRAPPERS_PREFIX "unlink", argv[i]);
+ res = EXIT_FAILURE;
+ }
+ }
+
+ return res;
+}
+
+static int
+execTestFile(int argc, char *argv[])
+{
+ int res = testInternal(argc, argv, "testfile");
+
+ return res!=-1 && S_ISREG(res) ? EXIT_SUCCESS : EXIT_FAILURE;
+}
+
+
+static struct Command {
+ char const *cmd;
+ int (*handler)(int argc, char *argv[]);
+} const COMMANDS[] = {
+ { "cat", execCat },
+ { "append", execAppend },
+ { "truncate", execTruncate },
+ { "testfile", execTestFile },
+ { "rm", execRm },
+ { 0,0 }
+};
+
+static void
+showHelp()
+{
+ WRITE_MSG(1,
+ "Usage: chroot-sh "
+ " [--] <cmd> <args>*\n\n"
+ "This program chroots into the current directory and executes the specified\n"
+ "commands there. This means that all used paths are relative to the current\n"
+ "directory, and symlinks can point to files under the current path only.\n"
+ "\n"
+ "The supported commands are:\n"
+ " cat <file> ... gives out <file> to stdout\n"
+ " append <file> ... appends stdin to <file> which is created when needed\n"
+ " truncate <file> ... clear <file> and fill it with stdin; the <file> is\n"
+ " created when needed\n"
+ " rm <file>+ ... unlink the given files\n\n"
+ "Please report bugs to " PACKAGE_BUGREPORT "\n");
+ exit(0);
+}
+
+static void
+showVersion()
+{
+ WRITE_MSG(1,
+ "chroot-sh " VERSION " -- execute commands within a chroot\n"
+ "This program is part of " PACKAGE_STRING "\n\n"
+ "Copyright (C) 2005 Enrico Scholz\n"
+ VERSION_COPYRIGHT_DISCLAIMER);
+ exit(0);
+}
+
+
+int main(int argc, char *argv[])
+{
+ struct Command const *cmd;
+ int idx = 1;
+
+ if (argc>=2) {
+ if (strcmp(argv[idx], "--help") ==0) showHelp();
+ if (strcmp(argv[idx], "--version")==0) showVersion();
+ if (strcmp(argv[idx], "--")==0) ++idx;
+ }
+
+ if (argc<idx+1) {
+ WRITE_MSG(2, "No command specified; try '--help' for more information\n");
+ return wrapper_exit_code;
+ }
+
+ Echroot(".");
+ Echdir("/");
+
+ for (cmd=COMMANDS+0; cmd->cmd!=0; ++cmd) {
+ if (strcmp(cmd->cmd, argv[idx])==0)
+ return cmd->handler(argc-idx, argv+idx);
+ }
+
+ WRITE_MSG(2, "Invalid command '");
+ WRITE_STR(2, argv[idx]);
+ WRITE_MSG(2, "'; try '--help' for more information\n");
+
+ return wrapper_exit_code;
+}
git://git.onelab.eu / util-vserver.git / blobdiff