rcp.c

早期freebsd实现

			}
		}
		if (close(fd) && !haderr)
			haderr = errno;
		if (!haderr)
			(void)write(rem, "", 1);
		else
			run_err("%s: %s", name, strerror(haderr));
		(void)response();
	}
}

void
rsource(name, statp)
	char *name;
	struct stat *statp;
{
	DIR *dirp;
	struct dirent *dp;
	char *last, *vect[1], path[MAXPATHLEN];

	if (!(dirp = opendir(name))) {
		run_err("%s: %s", name, strerror(errno));
		return;
	}
	last = strrchr(name, '/');
	if (last == 0)
		last = name;
	else
		last++;
	if (pflag) {
		(void)snprintf(path, sizeof(path), "T%ld 0 %ld 0\n",
		    statp->st_mtimespec.ts_sec, statp->st_atimespec.ts_sec);
		(void)write(rem, path, strlen(path));
		if (response() < 0) {
			closedir(dirp);
			return;
		}
	}
	(void)snprintf(path, sizeof(path),
	    "D%04o %d %s\n", statp->st_mode & MODEMASK, 0, last);
	(void)write(rem, path, strlen(path));
	if (response() < 0) {
		closedir(dirp);
		return;
	}
	while (dp = readdir(dirp)) {
		if (dp->d_ino == 0)
			continue;
		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
			continue;
		if (strlen(name) + 1 + strlen(dp->d_name) >= MAXPATHLEN - 1) {
			run_err("%s/%s: name too long", name, dp->d_name);
			continue;
		}
		(void)snprintf(path, sizeof(path), "%s/%s", name, dp->d_name);
		vect[0] = path;
		source(1, vect);
	}
	(void)closedir(dirp);
	(void)write(rem, "E\n", 2);
	(void)response();
}

void
sink(argc, argv)
	int argc;
	char *argv[];
{
	static BUF buffer;
	struct stat stb;
	struct timeval tv[2];
	enum { YES, NO, DISPLAYED } wrerr;
	BUF *bp;
	off_t i, j;
	int amt, count, exists, first, mask, mode, ofd, omode;
	int setimes, size, targisdir, wrerrno;
	char ch, *cp, *np, *targ, *why, *vect[1], buf[BUFSIZ];

#define	atime	tv[0]
#define	mtime	tv[1]
#define	SCREWUP(str)	{ why = str; goto screwup; }

	setimes = targisdir = 0;
	mask = umask(0);
	if (!pflag)
		(void)umask(mask);
	if (argc != 1) {
		run_err("ambiguous target");
		exit(1);
	}
	targ = *argv;
	if (targetshouldbedirectory)
		verifydir(targ);
	(void)write(rem, "", 1);
	if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
		targisdir = 1;
	for (first = 1;; first = 0) {
		cp = buf;
		if (read(rem, cp, 1) <= 0)
			return;
		if (*cp++ == '\n')
			SCREWUP("unexpected <newline>");
		do {
			if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
				SCREWUP("lost connection");
			*cp++ = ch;
		} while (cp < &buf[BUFSIZ - 1] && ch != '\n');
		*cp = 0;

		if (buf[0] == '\01' || buf[0] == '\02') {
			if (iamremote == 0)
				(void)write(STDERR_FILENO,
				    buf + 1, strlen(buf + 1));
			if (buf[0] == '\02')
				exit(1);
			++errs;
			continue;
		}
		if (buf[0] == 'E') {
			(void)write(rem, "", 1);
			return;
		}

		if (ch == '\n')
			*--cp = 0;

#define getnum(t) (t) = 0; while (isdigit(*cp)) (t) = (t) * 10 + (*cp++ - '0');
		cp = buf;
		if (*cp == 'T') {
			setimes++;
			cp++;
			getnum(mtime.tv_sec);
			if (*cp++ != ' ')
				SCREWUP("mtime.sec not delimited");
			getnum(mtime.tv_usec);
			if (*cp++ != ' ')
				SCREWUP("mtime.usec not delimited");
			getnum(atime.tv_sec);
			if (*cp++ != ' ')
				SCREWUP("atime.sec not delimited");
			getnum(atime.tv_usec);
			if (*cp++ != '\0')
				SCREWUP("atime.usec not delimited");
			(void)write(rem, "", 1);
			continue;
		}
		if (*cp != 'C' && *cp != 'D') {
			/*
			 * Check for the case "rcp remote:foo\* local:bar".
			 * In this case, the line "No match." can be returned
			 * by the shell before the rcp command on the remote is
			 * executed so the ^Aerror_message convention isn't
			 * followed.
			 */
			if (first) {
				run_err("%s", cp);
				exit(1);
			}
			SCREWUP("expected control record");
		}
		mode = 0;
		for (++cp; cp < buf + 5; cp++) {
			if (*cp < '0' || *cp > '7')
				SCREWUP("bad mode");
			mode = (mode << 3) | (*cp - '0');
		}
		if (*cp++ != ' ')
			SCREWUP("mode not delimited");

		for (size = 0; isdigit(*cp);)
			size = size * 10 + (*cp++ - '0');
		if (*cp++ != ' ')
			SCREWUP("size not delimited");
		if (targisdir) {
			static char *namebuf;
			static int cursize;
			size_t need;

			need = strlen(targ) + strlen(cp) + 250;
			if (need > cursize) {
				if (!(namebuf = malloc(need)))
					run_err("%s", strerror(errno));
			}
			(void)snprintf(namebuf, need, "%s%s%s", targ,
			    *targ ? "/" : "", cp);
			np = namebuf;
		} else
			np = targ;
		exists = stat(np, &stb) == 0;
		if (buf[0] == 'D') {
			int mod_flag = pflag;
			if (exists) {
				if (!S_ISDIR(stb.st_mode)) {
					errno = ENOTDIR;
					goto bad;
				}
				if (pflag)
					(void)chmod(np, mode);
			} else {
				/* Handle copying from a read-only directory */
				mod_flag = 1;
				if (mkdir(np, mode | S_IRWXU) < 0)
					goto bad;
			}
			vect[0] = np;
			sink(1, vect);
			if (setimes) {
				setimes = 0;
				if (utimes(np, tv) < 0)
				    run_err("%s: set times: %s",
					np, strerror(errno));
			}
			if (mod_flag)
				(void)chmod(np, mode);
			continue;
		}
		omode = mode;
		mode |= S_IWRITE;
		if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
bad:			run_err("%s: %s", np, strerror(errno));
			continue;
		}
		(void)write(rem, "", 1);
		if ((bp = allocbuf(&buffer, ofd, BUFSIZ)) == NULL) {
			(void)close(ofd);
			continue;
		}
		cp = bp->buf;
		wrerr = NO;
		for (count = i = 0; i < size; i += BUFSIZ) {
			amt = BUFSIZ;
			if (i + amt > size)
				amt = size - i;
			count += amt;
			do {
				j = read(rem, cp, amt);
				if (j <= 0) {
					run_err("%s", j ? strerror(errno) :
					    "dropped connection");
					exit(1);
				}
				amt -= j;
				cp += j;
			} while (amt > 0);
			if (count == bp->cnt) {
				/* Keep reading so we stay sync'd up. */
				if (wrerr == NO) {
					j = write(ofd, bp->buf, count);
					if (j != count) {
						wrerr = YES;
						wrerrno = j >= 0 ? EIO : errno; 
					}
				}
				count = 0;
				cp = bp->buf;
			}
		}
		if (count != 0 && wrerr == NO &&
		    (j = write(ofd, bp->buf, count)) != count) {
			wrerr = YES;
			wrerrno = j >= 0 ? EIO : errno; 
		}
		if (ftruncate(ofd, size)) {
			run_err("%s: truncate: %s", np, strerror(errno));
			wrerr = DISPLAYED;
		}
		if (pflag) {
			if (exists || omode != mode)
				if (fchmod(ofd, omode))
					run_err("%s: set mode: %s",
					    np, strerror(errno));
		} else {
			if (!exists && omode != mode)
				if (fchmod(ofd, omode & ~mask))
					run_err("%s: set mode: %s",
					    np, strerror(errno));
		}
		(void)close(ofd);
		(void)response();
		if (setimes && wrerr == NO) {
			setimes = 0;
			if (utimes(np, tv) < 0) {
				run_err("%s: set times: %s",
				    np, strerror(errno));
				wrerr = DISPLAYED;
			}
		}
		switch(wrerr) {
		case YES:
			run_err("%s: %s", np, strerror(wrerrno));
			break;
		case NO:
			(void)write(rem, "", 1);
			break;
		case DISPLAYED:
			break;
		}
	}
screwup:
	run_err("protocol error: %s", why);
	exit(1);
}

#ifdef KERBEROS
int
kerberos(host, bp, locuser, user)
	char **host, *bp, *locuser, *user;
{
	struct servent *sp;

again:
	if (use_kerberos) {
		rem = KSUCCESS;
		errno = 0;
		if (dest_realm == NULL)
			dest_realm = krb_realmofhost(*host);
		rem = 
#ifdef CRYPT
		    doencrypt ? 
			krcmd_mutual(host,
			    port, user, bp, 0, dest_realm, &cred, schedule) :
#endif
			krcmd(host, port, user, bp, 0, dest_realm);

		if (rem < 0) {
			use_kerberos = 0;
			if ((sp = getservbyname("shell", "tcp")) == NULL)
				errx(1, "unknown service shell/tcp");
			if (errno == ECONNREFUSED)
			    oldw("remote host doesn't support Kerberos");
			else if (errno == ENOENT)
			    oldw("can't provide Kerberos authentication data");
			port = sp->s_port;
			goto again;
		}
	} else {
#ifdef CRYPT
		if (doencrypt)
			errx(1,
			   "the -x option requires Kerberos authentication");
#endif
		rem = rcmd(host, port, locuser, user, bp, 0);
	}
	return (rem);
}
#endif /* KERBEROS */

int
response()
{
	char ch, *cp, resp, rbuf[BUFSIZ];

	if (read(rem, &resp, sizeof(resp)) != sizeof(resp))
		lostconn(0);

	cp = rbuf;
	switch(resp) {
	case 0:				/* ok */
		return (0);
	default:
		*cp++ = resp;
		/* FALLTHROUGH */
	case 1:				/* error, followed by error msg */
	case 2:				/* fatal error, "" */
		do {
			if (read(rem, &ch, sizeof(ch)) != sizeof(ch))
				lostconn(0);
			*cp++ = ch;
		} while (cp < &rbuf[BUFSIZ] && ch != '\n');

		if (!iamremote)
			(void)write(STDERR_FILENO, rbuf, cp - rbuf);
		++errs;
		if (resp == 1)
			return (-1);
		exit(1);
	}
	/* NOTREACHED */
}

void
usage()
{
#ifdef KERBEROS
#ifdef CRYPT
	(void)fprintf(stderr, "%s\n\t%s\n",
	    "usage: rcp [-Kpx] [-k realm] f1 f2",
	    "or: rcp [-Kprx] [-k realm] f1 ... fn directory");
#else
	(void)fprintf(stderr, "%s\n\t%s\n",
	    "usage: rcp [-Kp] [-k realm] f1 f2",
	    "or: rcp [-Kpr] [-k realm] f1 ... fn directory");
#endif
#else
	(void)fprintf(stderr,
	    "usage: rcp [-p] f1 f2; or: rcp [-pr] f1 ... fn directory\n");
#endif
	exit(1);
}

#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

#ifdef KERBEROS
void
#if __STDC__
oldw(const char *fmt, ...)
#else
oldw(fmt, va_alist)
	char *fmt;
        va_dcl
#endif
{
	va_list ap;
#if __STDC__
	va_start(ap, fmt);
#else
	va_start(ap);
#endif
	(void)fprintf(stderr, "rcp: ");
	(void)vfprintf(stderr, fmt, ap);
	(void)fprintf(stderr, ", using standard rcp\n");
	va_end(ap);
}
#endif

void
#if __STDC__
run_err(const char *fmt, ...)
#else
run_err(fmt, va_alist)
	char *fmt;
        va_dcl
#endif
{
	static FILE *fp;
	va_list ap;
#if __STDC__
	va_start(ap, fmt);
#else
	va_start(ap);
#endif

	++errs;
	if (fp == NULL && !(fp = fdopen(rem, "w")))
		return;
	(void)fprintf(fp, "%c", 0x01);
	(void)fprintf(fp, "rcp: ");
	(void)vfprintf(fp, fmt, ap);
	(void)fprintf(fp, "\n");
	(void)fflush(fp);

	if (!iamremote)
		vwarnx(fmt, ap);

	va_end(ap);
}