rcp.c

早期freebsd实现

/*
 * Copyright (c) 1983, 1990, 1992, 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 copyright[] =
"@(#) Copyright (c) 1983, 1990, 1992, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)rcp.c	8.2 (Berkeley) 4/2/94";
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>

#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string.h>
#include <unistd.h>

#include "pathnames.h"
#include "extern.h"

#ifdef KERBEROS
#include <kerberosIV/des.h>
#include <kerberosIV/krb.h>

char	dst_realm_buf[REALM_SZ];
char	*dest_realm = NULL;
int	use_kerberos = 1;
CREDENTIALS 	cred;
Key_schedule	schedule;
extern	char	*krb_realmofhost();
#ifdef CRYPT
int	doencrypt = 0;
#define	OPTIONS	"dfKk:prtx"
#else
#define	OPTIONS	"dfKk:prt"
#endif
#else
#define	OPTIONS "dfprt"
#endif

struct passwd *pwd;
u_short	port;
uid_t	userid;
int errs, rem;
int pflag, iamremote, iamrecursive, targetshouldbedirectory;

#define	CMDNEEDS	64
char cmd[CMDNEEDS];		/* must hold "rcp -r -p -d\0" */

#ifdef KERBEROS
int	 kerberos __P((char **, char *, char *, char *));
void	 oldw __P((const char *, ...));
#endif
int	 response __P((void));
void	 rsource __P((char *, struct stat *));
void	 sink __P((int, char *[]));
void	 source __P((int, char *[]));
void	 tolocal __P((int, char *[]));
void	 toremote __P((char *, int, char *[]));
void	 usage __P((void));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	struct servent *sp;
	int ch, fflag, tflag;
	char *targ, *shell;

	fflag = tflag = 0;
	while ((ch = getopt(argc, argv, OPTIONS)) != EOF)
		switch(ch) {			/* User-visible flags. */
		case 'K':
#ifdef KERBEROS
			use_kerberos = 0;
#endif
			break;
#ifdef	KERBEROS
		case 'k':
			dest_realm = dst_realm_buf;
			(void)strncpy(dst_realm_buf, optarg, REALM_SZ);
			break;
#ifdef CRYPT
		case 'x':
			doencrypt = 1;
			/* des_set_key(cred.session, schedule); */
			break;
#endif
#endif
		case 'p':
			pflag = 1;
			break;
		case 'r':
			iamrecursive = 1;
			break;
						/* Server options. */
		case 'd':
			targetshouldbedirectory = 1;
			break;
		case 'f':			/* "from" */
			iamremote = 1;
			fflag = 1;
			break;
		case 't':			/* "to" */
			iamremote = 1;
			tflag = 1;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

#ifdef KERBEROS
	if (use_kerberos) {
#ifdef CRYPT
		shell = doencrypt ? "ekshell" : "kshell";
#else
		shell = "kshell";
#endif
		if ((sp = getservbyname(shell, "tcp")) == NULL) {
			use_kerberos = 0;
			oldw("can't get entry for %s/tcp service", shell);
			sp = getservbyname(shell = "shell", "tcp");
		}
	} else
		sp = getservbyname(shell = "shell", "tcp");
#else
	sp = getservbyname(shell = "shell", "tcp");
#endif
	if (sp == NULL)
		errx(1, "%s/tcp: unknown service", shell);
	port = sp->s_port;

	if ((pwd = getpwuid(userid = getuid())) == NULL)
		errx(1, "unknown user %d", (int)userid);

	rem = STDIN_FILENO;		/* XXX */

	if (fflag) {			/* Follow "protocol", send data. */
		(void)response();
		(void)setuid(userid);
		source(argc, argv);
		exit(errs);
	}

	if (tflag) {			/* Receive data. */
		(void)setuid(userid);
		sink(argc, argv);
		exit(errs);
	}

	if (argc < 2)
		usage();
	if (argc > 2)
		targetshouldbedirectory = 1;

	rem = -1;
	/* Command to be executed on remote system using "rsh". */
#ifdef	KERBEROS
	(void)snprintf(cmd, sizeof(cmd),
	    "rcp%s%s%s%s", iamrecursive ? " -r" : "",
#ifdef CRYPT
	    (doencrypt && use_kerberos ? " -x" : ""),
#else
	    "",
#endif
	    pflag ? " -p" : "", targetshouldbedirectory ? " -d" : "");
#else
	(void)snprintf(cmd, sizeof(cmd), "rcp%s%s%s",
	    iamrecursive ? " -r" : "", pflag ? " -p" : "",
	    targetshouldbedirectory ? " -d" : "");
#endif

	(void)signal(SIGPIPE, lostconn);

	if (targ = colon(argv[argc - 1]))	/* Dest is remote host. */
		toremote(targ, argc, argv);
	else {
		tolocal(argc, argv);		/* Dest is local host. */
		if (targetshouldbedirectory)
			verifydir(argv[argc - 1]);
	}
	exit(errs);
}

void
toremote(targ, argc, argv)
	char *targ, *argv[];
	int argc;
{
	int i, len, tos;
	char *bp, *host, *src, *suser, *thost, *tuser;

	*targ++ = 0;
	if (*targ == 0)
		targ = ".";

	if (thost = strchr(argv[argc - 1], '@')) {
		/* user@host */
		*thost++ = 0;
		tuser = argv[argc - 1];
		if (*tuser == '\0')
			tuser = NULL;
		else if (!okname(tuser))
			exit(1);
	} else {
		thost = argv[argc - 1];
		tuser = NULL;
	}

	for (i = 0; i < argc - 1; i++) {
		src = colon(argv[i]);
		if (src) {			/* remote to remote */
			*src++ = 0;
			if (*src == 0)
				src = ".";
			host = strchr(argv[i], '@');
			len = strlen(_PATH_RSH) + strlen(argv[i]) +
			    strlen(src) + (tuser ? strlen(tuser) : 0) +
			    strlen(thost) + strlen(targ) + CMDNEEDS + 20;
			if (!(bp = malloc(len)))
				err(1, NULL);
			if (host) {
				*host++ = 0;
				suser = argv[i];
				if (*suser == '\0')
					suser = pwd->pw_name;
				else if (!okname(suser))
					continue;
				(void)snprintf(bp, len,
				    "%s %s -l %s -n %s %s '%s%s%s:%s'",
				    _PATH_RSH, host, suser, cmd, src,
				    tuser ? tuser : "", tuser ? "@" : "",
				    thost, targ);
			} else
				(void)snprintf(bp, len,
				    "exec %s %s -n %s %s '%s%s%s:%s'",
				    _PATH_RSH, argv[i], cmd, src,
				    tuser ? tuser : "", tuser ? "@" : "",
				    thost, targ);
			(void)susystem(bp, userid);
			(void)free(bp);
		} else {			/* local to remote */
			if (rem == -1) {
				len = strlen(targ) + CMDNEEDS + 20;
				if (!(bp = malloc(len)))
					err(1, NULL);
				(void)snprintf(bp, len, "%s -t %s", cmd, targ);
				host = thost;
#ifdef KERBEROS
				if (use_kerberos)
					rem = kerberos(&host, bp,
					    pwd->pw_name,
					    tuser ? tuser : pwd->pw_name);
				else
#endif
					rem = rcmd(&host, port, pwd->pw_name,
					    tuser ? tuser : pwd->pw_name,
					    bp, 0);
				if (rem < 0)
					exit(1);
				tos = IPTOS_THROUGHPUT;
				if (setsockopt(rem, IPPROTO_IP, IP_TOS,
				    &tos, sizeof(int)) < 0)
					warn("TOS (ignored)");
				if (response() < 0)
					exit(1);
				(void)free(bp);
				(void)setuid(userid);
			}
			source(1, argv+i);
		}
	}
}

void
tolocal(argc, argv)
	int argc;
	char *argv[];
{
	int i, len, tos;
	char *bp, *host, *src, *suser;

	for (i = 0; i < argc - 1; i++) {
		if (!(src = colon(argv[i]))) {		/* Local to local. */
			len = strlen(_PATH_CP) + strlen(argv[i]) +
			    strlen(argv[argc - 1]) + 20;
			if (!(bp = malloc(len)))
				err(1, NULL);
			(void)snprintf(bp, len, "exec %s%s%s %s %s", _PATH_CP,
			    iamrecursive ? " -r" : "", pflag ? " -p" : "",
			    argv[i], argv[argc - 1]);
			if (susystem(bp, userid))
				++errs;
			(void)free(bp);
			continue;
		}
		*src++ = 0;
		if (*src == 0)
			src = ".";
		if ((host = strchr(argv[i], '@')) == NULL) {
			host = argv[i];
			suser = pwd->pw_name;
		} else {
			*host++ = 0;
			suser = argv[i];
			if (*suser == '\0')
				suser = pwd->pw_name;
			else if (!okname(suser))
				continue;
		}
		len = strlen(src) + CMDNEEDS + 20;
		if ((bp = malloc(len)) == NULL)
			err(1, NULL);
		(void)snprintf(bp, len, "%s -f %s", cmd, src);
		rem = 
#ifdef KERBEROS
		    use_kerberos ? 
			kerberos(&host, bp, pwd->pw_name, suser) : 
#endif
			rcmd(&host, port, pwd->pw_name, suser, bp, 0);
		(void)free(bp);
		if (rem < 0) {
			++errs;
			continue;
		}
		(void)seteuid(userid);
		tos = IPTOS_THROUGHPUT;
		if (setsockopt(rem, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
			warn("TOS (ignored)");
		sink(1, argv + argc - 1);
		(void)seteuid(0);
		(void)close(rem);
		rem = -1;
	}
}

void
source(argc, argv)
	int argc;
	char *argv[];
{
	struct stat stb;
	static BUF buffer;
	BUF *bp;
	off_t i;
	int amt, fd, haderr, indx, result;
	char *last, *name, buf[BUFSIZ];

	for (indx = 0; indx < argc; ++indx) {
                name = argv[indx];
		if ((fd = open(name, O_RDONLY, 0)) < 0)
			goto syserr;
		if (fstat(fd, &stb)) {
syserr:			run_err("%s: %s", name, strerror(errno));
			goto next;
		}
		switch (stb.st_mode & S_IFMT) {
		case S_IFREG:
			break;
		case S_IFDIR:
			if (iamrecursive) {
				rsource(name, &stb);
				goto next;
			}
			/* FALLTHROUGH */
		default:
			run_err("%s: not a regular file", name);
			goto next;
		}
		if ((last = strrchr(name, '/')) == NULL)
			last = name;
		else
			++last;
		if (pflag) {
			/*
			 * Make it compatible with possible future
			 * versions expecting microseconds.
			 */
			(void)snprintf(buf, sizeof(buf), "T%ld 0 %ld 0\n",
			    stb.st_mtimespec.ts_sec, stb.st_atimespec.ts_sec);
			(void)write(rem, buf, strlen(buf));
			if (response() < 0)
				goto next;
		}
#define	MODEMASK	(S_ISUID|S_ISGID|S_ISTXT|S_IRWXU|S_IRWXG|S_IRWXO)
		(void)snprintf(buf, sizeof(buf), "C%04o %qd %s\n",
		    stb.st_mode & MODEMASK, stb.st_size, last);
		(void)write(rem, buf, strlen(buf));
		if (response() < 0)
			goto next;
		if ((bp = allocbuf(&buffer, fd, BUFSIZ)) == NULL) {
next:			(void)close(fd);
			continue;
		}

		/* Keep writing after an error so that we stay sync'd up. */
		for (haderr = i = 0; i < stb.st_size; i += bp->cnt) {
			amt = bp->cnt;
			if (i + amt > stb.st_size)
				amt = stb.st_size - i;
			if (!haderr) {
				result = read(fd, bp->buf, amt);
				if (result != amt)
					haderr = result >= 0 ? EIO : errno;
			}
			if (haderr)
				(void)write(rem, bp->buf, amt);
			else {
				result = write(rem, bp->buf, amt);
				if (result != amt)
					haderr = result >= 0 ? EIO : errno;