interactive.c

早期freebsd实现

/*
 * Copyright (c) 1985, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)interactive.c	8.1 (Berkeley) 6/5/93";
#endif /* not lint */

#include <sys/param.h>
#include <sys/time.h>
#include <sys/stat.h>

#include <ufs/ffs/fs.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/dir.h>
#include <protocols/dumprestore.h>

#include <setjmp.h>
#include <glob.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "restore.h"
#include "extern.h"

#define round(a, b) (((a) + (b) - 1) / (b) * (b))

/*
 * Things to handle interruptions.
 */
static int runshell;
static jmp_buf reset;
static char *nextarg = NULL;

/*
 * Structure and routines associated with listing directories.
 */
struct afile {
	ino_t	fnum;		/* inode number of file */
	char	*fname;		/* file name */
	short	len;		/* name length */
	char	prefix;		/* prefix character */
	char	postfix;	/* postfix character */
};
struct arglist {
	int	freeglob;	/* glob structure needs to be freed */
	int	argcnt;		/* next globbed argument to return */
	glob_t	glob;		/* globbing information */
	char	*cmd;		/* the current command */
};

static char	*copynext __P((char *, char *));
static int	 fcmp __P((const void *, const void *));
static void	 formatf __P((struct afile *, int));
static void	 getcmd __P((char *, char *, char *, struct arglist *));
struct dirent	*glob_readdir __P((RST_DIR *dirp));
static int	 glob_stat __P((const char *, struct stat *));
static void	 mkentry __P((struct direct *, struct afile *));
static void	 printlist __P((char *, char *));

/*
 * Read and execute commands from the terminal.
 */
void
runcmdshell()
{
	register struct entry *np;
	ino_t ino;
	struct arglist arglist;
	char curdir[MAXPATHLEN];
	char name[MAXPATHLEN];
	char cmd[BUFSIZ];

	arglist.freeglob = 0;
	arglist.argcnt = 0;
	arglist.glob.gl_flags = GLOB_ALTDIRFUNC;
	arglist.glob.gl_opendir = (void *)rst_opendir;
	arglist.glob.gl_readdir = (void *)glob_readdir;
	arglist.glob.gl_closedir = (void *)rst_closedir;
	arglist.glob.gl_lstat = glob_stat;
	arglist.glob.gl_stat = glob_stat;
	canon("/", curdir);
loop:
	if (setjmp(reset) != 0) {
		if (arglist.freeglob != 0) {
			arglist.freeglob = 0;
			arglist.argcnt = 0;
			globfree(&arglist.glob);
		}
		nextarg = NULL;
		volno = 0;
	}
	runshell = 1;
	getcmd(curdir, cmd, name, &arglist);
	switch (cmd[0]) {
	/*
	 * Add elements to the extraction list.
	 */
	case 'a':
		if (strncmp(cmd, "add", strlen(cmd)) != 0)
			goto bad;
		ino = dirlookup(name);
		if (ino == 0)
			break;
		if (mflag)
			pathcheck(name);
		treescan(name, ino, addfile);
		break;
	/*
	 * Change working directory.
	 */
	case 'c':
		if (strncmp(cmd, "cd", strlen(cmd)) != 0)
			goto bad;
		ino = dirlookup(name);
		if (ino == 0)
			break;
		if (inodetype(ino) == LEAF) {
			fprintf(stderr, "%s: not a directory\n", name);
			break;
		}
		(void) strcpy(curdir, name);
		break;
	/*
	 * Delete elements from the extraction list.
	 */
	case 'd':
		if (strncmp(cmd, "delete", strlen(cmd)) != 0)
			goto bad;
		np = lookupname(name);
		if (np == NULL || (np->e_flags & NEW) == 0) {
			fprintf(stderr, "%s: not on extraction list\n", name);
			break;
		}
		treescan(name, np->e_ino, deletefile);
		break;
	/*
	 * Extract the requested list.
	 */
	case 'e':
		if (strncmp(cmd, "extract", strlen(cmd)) != 0)
			goto bad;
		createfiles();
		createlinks();
		setdirmodes(0);
		if (dflag)
			checkrestore();
		volno = 0;
		break;
	/*
	 * List available commands.
	 */
	case 'h':
		if (strncmp(cmd, "help", strlen(cmd)) != 0)
			goto bad;
	case '?':
		fprintf(stderr, "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
			"Available commands are:\n",
			"\tls [arg] - list directory\n",
			"\tcd arg - change directory\n",
			"\tpwd - print current directory\n",
			"\tadd [arg] - add `arg' to list of",
			" files to be extracted\n",
			"\tdelete [arg] - delete `arg' from",
			" list of files to be extracted\n",
			"\textract - extract requested files\n",
			"\tsetmodes - set modes of requested directories\n",
			"\tquit - immediately exit program\n",
			"\twhat - list dump header information\n",
			"\tverbose - toggle verbose flag",
			" (useful with ``ls'')\n",
			"\thelp or `?' - print this list\n",
			"If no `arg' is supplied, the current",
			" directory is used\n");
		break;
	/*
	 * List a directory.
	 */
	case 'l':
		if (strncmp(cmd, "ls", strlen(cmd)) != 0)
			goto bad;
		printlist(name, curdir);
		break;
	/*
	 * Print current directory.
	 */
	case 'p':
		if (strncmp(cmd, "pwd", strlen(cmd)) != 0)
			goto bad;
		if (curdir[1] == '\0')
			fprintf(stderr, "/\n");
		else
			fprintf(stderr, "%s\n", &curdir[1]);
		break;
	/*
	 * Quit.
	 */
	case 'q':
		if (strncmp(cmd, "quit", strlen(cmd)) != 0)
			goto bad;
		return;
	case 'x':
		if (strncmp(cmd, "xit", strlen(cmd)) != 0)
			goto bad;
		return;
	/*
	 * Toggle verbose mode.
	 */
	case 'v':
		if (strncmp(cmd, "verbose", strlen(cmd)) != 0)
			goto bad;
		if (vflag) {
			fprintf(stderr, "verbose mode off\n");
			vflag = 0;
			break;
		}
		fprintf(stderr, "verbose mode on\n");
		vflag++;
		break;
	/*
	 * Just restore requested directory modes.
	 */
	case 's':
		if (strncmp(cmd, "setmodes", strlen(cmd)) != 0)
			goto bad;
		setdirmodes(FORCE);
		break;
	/*
	 * Print out dump header information.
	 */
	case 'w':
		if (strncmp(cmd, "what", strlen(cmd)) != 0)
			goto bad;
		printdumpinfo();
		break;
	/*
	 * Turn on debugging.
	 */
	case 'D':
		if (strncmp(cmd, "Debug", strlen(cmd)) != 0)
			goto bad;
		if (dflag) {
			fprintf(stderr, "debugging mode off\n");
			dflag = 0;
			break;
		}
		fprintf(stderr, "debugging mode on\n");
		dflag++;
		break;
	/*
	 * Unknown command.
	 */
	default:
	bad:
		fprintf(stderr, "%s: unknown command; type ? for help\n", cmd);
		break;
	}
	goto loop;
}

/*
 * Read and parse an interactive command.
 * The first word on the line is assigned to "cmd". If
 * there are no arguments on the command line, then "curdir"
 * is returned as the argument. If there are arguments
 * on the line they are returned one at a time on each
 * successive call to getcmd. Each argument is first assigned
 * to "name". If it does not start with "/" the pathname in
 * "curdir" is prepended to it. Finally "canon" is called to
 * eliminate any embedded ".." components.
 */
static void
getcmd(curdir, cmd, name, ap)
	char *curdir, *cmd, *name;
	struct arglist *ap;
{
	register char *cp;
	static char input[BUFSIZ];
	char output[BUFSIZ];
#	define rawname input	/* save space by reusing input buffer */

	/*
	 * Check to see if still processing arguments.
	 */
	if (ap->argcnt > 0)
		goto retnext;
	if (nextarg != NULL)
		goto getnext;
	/*
	 * Read a command line and trim off trailing white space.
	 */
	do	{
		fprintf(stderr, "restore > ");
		(void) fflush(stderr);
		(void) fgets(input, BUFSIZ, terminal);
	} while (!feof(terminal) && input[0] == '\n');
	if (feof(terminal)) {
		(void) strcpy(cmd, "quit");
		return;
	}
	for (cp = &input[strlen(input) - 2]; *cp == ' ' || *cp == '\t'; cp--)
		/* trim off trailing white space and newline */;
	*++cp = '\0';
	/*
	 * Copy the command into "cmd".
	 */
	cp = copynext(input, cmd);
	ap->cmd = cmd;
	/*
	 * If no argument, use curdir as the default.
	 */
	if (*cp == '\0') {
		(void) strcpy(name, curdir);
		return;
	}
	nextarg = cp;
	/*
	 * Find the next argument.
	 */
getnext:
	cp = copynext(nextarg, rawname);
	if (*cp == '\0')
		nextarg = NULL;
	else
		nextarg = cp;
	/*
	 * If it is an absolute pathname, canonicalize it and return it.
	 */
	if (rawname[0] == '/') {
		canon(rawname, name);
	} else {
		/*
		 * For relative pathnames, prepend the current directory to
		 * it then canonicalize and return it.
		 */
		(void) strcpy(output, curdir);
		(void) strcat(output, "/");
		(void) strcat(output, rawname);
		canon(output, name);
	}
	if (glob(name, GLOB_ALTDIRFUNC, NULL, &ap->glob) < 0)
		fprintf(stderr, "%s: out of memory\n", ap->cmd);
	if (ap->glob.gl_pathc == 0)
		return;
	ap->freeglob = 1;
	ap->argcnt = ap->glob.gl_pathc;

retnext: