X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/4915309067602ac28585d822b98c9d4c42a01bf6..a9f6bdc7e061375b05c9c24e06295c3613bbc9e7:/usr/src/usr.bin/rsh/rsh.c

diff --git a/usr/src/usr.bin/rsh/rsh.c b/usr/src/usr.bin/rsh/rsh.c
index 51249b66f3..6e2c26d152 100644
--- a/usr/src/usr.bin/rsh/rsh.c
+++ b/usr/src/usr.bin/rsh/rsh.c
@@ -1,371 +1,406 @@
-/*
- * Copyright (c) 1983 The Regents of the University of California.
- * All rights reserved.
+/*-
+ * Copyright (c) 1983, 1990, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
  *
- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by the University of California, Berkeley.  The name of the
- * University may not be used to endorse or promote products derived
- * from this software without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ * %sccs.include.redist.c%
  */
 
 #ifndef lint
-char copyright[] =
-"@(#) Copyright (c) 1983 The Regents of the University of California.\n\
- All rights reserved.\n";
+static char copyright[] =
+"@(#) Copyright (c) 1983, 1990, 1993, 1994\n\
+	The Regents of the University of California.  All rights reserved.\n";
 #endif /* not lint */
 
 #ifndef lint
-static char sccsid[] = "@(#)rsh.c	5.12 (Berkeley) %G%";
+static char sccsid[] = "@(#)rsh.c	8.3 (Berkeley) %G%";
 #endif /* not lint */
 
+/*
+ * $Source: mit/rsh/RCS/rsh.c,v $
+ * $Header: mit/rsh/RCS/rsh.c,v 5.1 89/07/31 19:28:59 kfall Exp Locker: kfall $
+ */
+
 #include <sys/types.h>
+#include <sys/signal.h>
 #include <sys/socket.h>
 #include <sys/ioctl.h>
 #include <sys/file.h>
 
 #include <netinet/in.h>
+#include <netdb.h>
 
-#include <stdio.h>
+#include <err.h>
 #include <errno.h>
-#include <signal.h>
 #include <pwd.h>
-#include <netdb.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <varargs.h>
+
 #include "pathnames.h"
 
-#ifdef	KERBEROS
-#include <kerberos/krb.h>
-char	krb_realm[REALM_SZ];
-int	use_kerberos = 1, encrypt = 0;
-CREDENTIALS	cred;
-Key_schedule	schedule;
-#endif	/* KERBEROS */
+#ifdef KERBEROS
+#include <kerberosIV/des.h>
+#include <kerberosIV/krb.h>
+
+CREDENTIALS cred;
+Key_schedule schedule;
+int use_kerberos = 1, doencrypt;
+char dst_realm_buf[REALM_SZ], *dest_realm;
+extern char *krb_realmofhost();
+#endif
 
 /*
  * rsh - remote shell
  */
-/* VARARGS */
-int	error();
-char	*index(), *rindex(), *malloc(), *getpass(), *strcpy();
-
-struct	passwd *getpwuid();
-
-int	errno;
-int	options;
 int	rfd2;
-int	nflag;
-int	sendsig();
 
-#define	mask(s)	(1 << ((s) - 1))
+char   *copyargs __P((char **));
+void	sendsig __P((int));
+void	talk __P((int, long, pid_t, int));
+void	usage __P((void));
+void	warning __P(());
 
-main(argc, argv0)
+int
+main(argc, argv)
 	int argc;
-	char **argv0;
+	char **argv;
 {
-	int rem, pid;
-	char *host, *cp, **ap, buf[BUFSIZ], *args, **argv = argv0, *user = 0;
-	register int cc;
-	int asrsh = 0;
-	struct passwd *pwd;
-	int readfrom, ready;
-	int one = 1;
+	struct passwd *pw;
 	struct servent *sp;
-	int omask;
+	long omask;
+	int argoff, asrsh, ch, dflag, nflag, one, rem;
+	pid_t pid;
+	uid_t uid;
+	char *args, *host, *p, *user;
+
+	argoff = asrsh = dflag = nflag = 0;
+	one = 1;
+	host = user = NULL;
 
-	host = rindex(argv[0], '/');
-	if (host)
-		host++;
+	/* if called as something other than "rsh", use it as the host name */
+	if (p = strrchr(argv[0], '/'))
+		++p;
+	else
+		p = argv[0];
+	if (strcmp(p, "rsh"))
+		host = p;
 	else
-		host = argv[0];
-	argv++, --argc;
-	if (!strcmp(host, "rsh")) {
-		host = *argv++, --argc;
 		asrsh = 1;
-	}
-another:
-	if (argc > 0 && !strcmp(*argv, "-l")) {
-		argv++, argc--;
-		if (argc > 0)
-			user = *argv++, argc--;
-		goto another;
-	}
-	if (argc > 0 && !strcmp(*argv, "-n")) {
-		argv++, argc--;
-		nflag++;
-		goto another;
-	}
-	if (argc > 0 && !strcmp(*argv, "-d")) {
-		argv++, argc--;
-		options |= SO_DEBUG;
-		goto another;
-	}
-	/*
-	 * Ignore the -L, -w, -e and -8 flags to allow aliases with rlogin
-	 * to work
-	 *
-	 * There must be a better way to do this! -jmb
-	 */
-	if (argc > 0 && !strncmp(*argv, "-L", 2)) {
-		argv++, argc--;
-		goto another;
-	}
-	if (argc > 0 && !strncmp(*argv, "-w", 2)) {
-		argv++, argc--;
-		goto another;
-	}
-	if (argc > 0 && !strncmp(*argv, "-e", 2)) {
-		argv++, argc--;
-		goto another;
-	}
-	if (argc > 0 && !strncmp(*argv, "-8", 2)) {
-		argv++, argc--;
-		goto another;
-	}
 
-#ifdef	KERBEROS
-	if(argc > 0 && !strncmp(*argv, "-x", 2)) {
-		encrypt = 1;
-		des_set_key(cred.session, schedule);
-		argv++, argc--;
-		goto another;
+	/* handle "rsh host flags" */
+	if (!host && argc > 2 && argv[1][0] != '-') {
+		host = argv[1];
+		argoff = 1;
 	}
 
-	if(argc > 0 && !strcmp(*argv, "-k")) {
-		argv++, argc--;
-		if(argc <= 0 || (**argv == '-')) {
-			fprintf(stderr, "-k option requires an argument\n");
-			exit(1);
-		}
-		strncpy(krb_realm, *argv, REALM_SZ);
-		argv++, argc--;
-		goto another;
-	}
+#ifdef KERBEROS
+#define	OPTIONS	"8KLdek:l:nw"
+#else
+#define	OPTIONS	"8KLdel:nw"
+#endif
+	while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != EOF)
+		switch(ch) {
+		case 'K':
+#ifdef KERBEROS
+			use_kerberos = 0;
+#endif
+			break;
+		case 'L':	/* -8Lew are ignored to allow rlogin aliases */
+		case 'e':
+		case 'w':
+		case '8':
+			break;
+		case 'd':
+			dflag = 1;
+			break;
+		case 'l':
+			user = optarg;
+			break;
+#ifdef KERBEROS
+		case 'k':
+			dest_realm = dst_realm_buf;
+			strncpy(dest_realm, optarg, REALM_SZ);
+			break;
+#endif
+		case 'n':
+			nflag = 1;
+			break;
+#ifdef KERBEROS
 #endif
+		case '?':
+		default:
+			usage();
+		}
+	optind += argoff;
+
+	/* if haven't gotten a host yet, do so */
+	if (!host && !(host = argv[optind++]))
+		usage();
 
-	if (host == 0)
-		goto usage;
-	if (argv[0] == 0) {
+	/* if no further arguments, must have been called as rlogin. */
+	if (!argv[optind]) {
 		if (asrsh)
-			*argv0 = "rlogin";
-		execv(_PATH_RLOGIN, argv0);
-		perror(_PATH_RLOGIN);
-		exit(1);
+			*argv = "rlogin";
+		execv(_PATH_RLOGIN, argv);
+		err(1, "can't exec %s", _PATH_RLOGIN);
 	}
-	pwd = getpwuid(getuid());
-	if (pwd == 0) {
-		fprintf(stderr, "who are you?\n");
-		exit(1);
-	}
-	cc = 0;
-	for (ap = argv; *ap; ap++)
-		cc += strlen(*ap) + 1;
-	cp = args = malloc(cc);
-	for (ap = argv; *ap; ap++) {
-		(void) strcpy(cp, *ap);
-		while (*cp)
-			cp++;
-		if (ap[1])
-			*cp++ = ' ';
-	}
-#ifdef	KERBEROS
-	sp = getservbyname("kshell", "tcp");
-	if (sp == NULL) {
-		use_kerberos = 0;
-		old_warning("kshell service unknown");
-		sp = getservbyname("shell", "tcp");
-	}
-#else
-	sp = getservbyname("shell", "tcp");
+
+	argc -= optind;
+	argv += optind;
+
+	if (!(pw = getpwuid(uid = getuid())))
+		errx(1, "unknown user id");
+	if (!user)
+		user = pw->pw_name;
+
+#ifdef KERBEROS
 #endif
 
-	if (sp == 0) {
-		fprintf(stderr, "rsh: shell/tcp: unknown service\n");
-		exit(1);
+	args = copyargs(argv);
+
+	sp = NULL;
+#ifdef KERBEROS
+	if (use_kerberos) {
+		sp = getservbyname((doencrypt ? "ekshell" : "kshell"), "tcp");
+		if (sp == NULL) {
+			use_kerberos = 0;
+			warning("can't get entry for %s/tcp service",
+			    doencrypt ? "ekshell" : "kshell");
+		}
 	}
+#endif
+	if (sp == NULL)
+		sp = getservbyname("shell", "tcp");
+	if (sp == NULL)
+		errx(1, "shell/tcp: unknown service");
 
-#ifdef	KERBEROS
+#ifdef KERBEROS
 try_connect:
-	if(use_kerberos) {
+	if (use_kerberos) {
+		struct hostent *hp;
+
+		/* fully qualify hostname (needed for krb_realmofhost) */
+		hp = gethostbyname(host);
+		if (hp != NULL && !(host = strdup(hp->h_name)))
+			err(1, NULL);
+
 		rem = KSUCCESS;
-		if(krb_realm[0] == '\0') {
-			rem = krb_get_lrealm(krb_realm, 1);
-		}
+		errno = 0;
+		if (dest_realm == NULL)
+			dest_realm = krb_realmofhost(host);
 
-		if(rem == KSUCCESS) {
-			if(encrypt) {
-				rem = krcmd_mutual(
-					&host, sp->s_port,
-					user ? user : pwd->pw_name,
-					args,
-					&rfd2,
-					krb_realm,
-					&cred, schedule);
-			} else {
-				rem = krcmd(
-					&host,
-					sp->s_port,
-					user ? user : pwd->pw_name,
-					args,
-					&rfd2,
-					krb_realm
-				);
-			}
-		} else {
-			fprintf(stderr,
-			    "%s: error getting local realm\n",
-			    argv0[0]);
-			exit(1);
-		}
-		if((rem < 0) && errno == ECONNREFUSED) {
+			rem = krcmd(&host, sp->s_port, user, args, &rfd2,
+			    dest_realm);
+		if (rem < 0) {
 			use_kerberos = 0;
 			sp = getservbyname("shell", "tcp");
-			if(sp == NULL) {
-				fprintf(stderr, "unknown service shell/tcp\n");
-				exit(1);
-			}
-			old_warning("remote host doesn't support Kerberos");
+			if (sp == NULL)
+				errx(1, "shell/tcp: unknown service");
+			if (errno == ECONNREFUSED)
+				warning("remote host doesn't support Kerberos");
+			if (errno == ENOENT)
+				warning("can't provide Kerberos auth data");
 			goto try_connect;
 		}
 	} else {
-		if(encrypt) {
-			fprintf(stderr,"The -x flag requires Kerberos authentication\n");
-			exit(1);
-		}
-        	rem = rcmd(&host, sp->s_port, pwd->pw_name,
-	    		user ? user : pwd->pw_name, args, &rfd2);
+		if (doencrypt)
+			errx(1, "the -x flag requires Kerberos authentication");
+		rem = rcmd(&host, sp->s_port, pw->pw_name, user, args, &rfd2);
 	}
-
 #else
-			   
-        rem = rcmd(&host, sp->s_port, pwd->pw_name,
-		user ? user : pwd->pw_name, args, &rfd2);
+	rem = rcmd(&host, sp->s_port, pw->pw_name, user, args, &rfd2);
 #endif
 
-        if (rem < 0)
-                exit(1);
+	if (rem < 0)
+		exit(1);
 
-	if (rfd2 < 0) {
-		fprintf(stderr, "rsh: can't establish stderr\n");
-		exit(2);
+	if (rfd2 < 0)
+		errx(1, "can't establish stderr");
+	if (dflag) {
+		if (setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one,
+		    sizeof(one)) < 0)
+			warn("setsockopt");
+		if (setsockopt(rfd2, SOL_SOCKET, SO_DEBUG, &one,
+		    sizeof(one)) < 0)
+			warn("setsockopt");
 	}
-	if (options & SO_DEBUG) {
-		if (setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one, sizeof (one)) < 0)
-			perror("setsockopt (stdin)");
-		if (setsockopt(rfd2, SOL_SOCKET, SO_DEBUG, &one, sizeof (one)) < 0)
-			perror("setsockopt (stderr)");
-	}
-	(void) setuid(getuid());
-	omask = sigblock(mask(SIGINT)|mask(SIGQUIT)|mask(SIGTERM));
+
+	(void)setuid(uid);
+	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGTERM));
 	if (signal(SIGINT, SIG_IGN) != SIG_IGN)
-		signal(SIGINT, sendsig);
+		(void)signal(SIGINT, sendsig);
 	if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
-		signal(SIGQUIT, sendsig);
+		(void)signal(SIGQUIT, sendsig);
 	if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
-		signal(SIGTERM, sendsig);
-	if (nflag == 0) {
+		(void)signal(SIGTERM, sendsig);
+
+	if (!nflag) {
 		pid = fork();
-		if (pid < 0) {
-			perror("fork");
-			exit(1);
-		}
+		if (pid < 0)
+			err(1, "fork");
 	}
-	ioctl(rfd2, FIONBIO, &one);
-	ioctl(rem, FIONBIO, &one);
-        if (nflag == 0 && pid == 0) {
-		char *bp; int rembits, wc;
-		(void) close(rfd2);
-	reread:
-		errno = 0;
-		cc = read(0, buf, sizeof buf);
-		if (cc <= 0)
+
+#ifdef KERBEROS
+#endif
+	{
+		(void)ioctl(rfd2, FIONBIO, &one);
+		(void)ioctl(rem, FIONBIO, &one);
+	}
+
+	talk(nflag, omask, pid, rem);
+
+	if (!nflag)
+		(void)kill(pid, SIGKILL);
+	exit(0);
+}
+
+void
+talk(nflag, omask, pid, rem)
+	int nflag;
+	long omask;
+	pid_t pid;
+	int rem;
+{
+	int cc, wc;
+	fd_set readfrom, ready, rembits;
+	char *bp, buf[BUFSIZ];
+
+	if (!nflag && pid == 0) {
+		(void)close(rfd2);
+
+reread:		errno = 0;
+		if ((cc = read(0, buf, sizeof buf)) <= 0)
 			goto done;
 		bp = buf;
-	rewrite:
-		rembits = 1<<rem;
+
+rewrite:	
+		FD_ZERO(&rembits);
+		FD_SET(rem, &rembits);
 		if (select(16, 0, &rembits, 0, 0) < 0) {
-			if (errno != EINTR) {
-				perror("select");
-				exit(1);
-			}
+			if (errno != EINTR)
+				err(1, "select");
 			goto rewrite;
 		}
-		if ((rembits & (1<<rem)) == 0)
+		if (!FD_ISSET(rem, &rembits))
 			goto rewrite;
-		wc = write(rem, bp, cc);
+#ifdef KERBEROS
+#endif
+			wc = write(rem, bp, cc);
 		if (wc < 0) {
 			if (errno == EWOULDBLOCK)
 				goto rewrite;
 			goto done;
 		}
-		cc -= wc; bp += wc;
+		bp += wc;
+		cc -= wc;
 		if (cc == 0)
 			goto reread;
 		goto rewrite;
-	done:
-		(void) shutdown(rem, 1);
+done:
+		(void)shutdown(rem, 1);
 		exit(0);
 	}
-	sigsetmask(omask);
-	readfrom = (1<<rfd2) | (1<<rem);
+
+	(void)sigsetmask(omask);
+	FD_ZERO(&readfrom);
+	FD_SET(rfd2, &readfrom);
+	FD_SET(rem, &readfrom);
 	do {
 		ready = readfrom;
 		if (select(16, &ready, 0, 0, 0) < 0) {
-			if (errno != EINTR) {
-				perror("select");
-				exit(1);
-			}
+			if (errno != EINTR)
+				err(1, "select");
 			continue;
 		}
-		if (ready & (1<<rfd2)) {
+		if (FD_ISSET(rfd2, &ready)) {
 			errno = 0;
-			cc = read(rfd2, buf, sizeof buf);
+#ifdef KERBEROS
+#endif
+				cc = read(rfd2, buf, sizeof buf);
 			if (cc <= 0) {
 				if (errno != EWOULDBLOCK)
-					readfrom &= ~(1<<rfd2);
+					FD_CLR(rfd2, &readfrom);
 			} else
-				(void) write(2, buf, cc);
+				(void)write(2, buf, cc);
 		}
-		if (ready & (1<<rem)) {
+		if (FD_ISSET(rem, &ready)) {
 			errno = 0;
-			cc = read(rem, buf, sizeof buf);
+#ifdef KERBEROS
+#endif
+				cc = read(rem, buf, sizeof buf);
 			if (cc <= 0) {
 				if (errno != EWOULDBLOCK)
-					readfrom &= ~(1<<rem);
+					FD_CLR(rem, &readfrom);
 			} else
-				(void) write(1, buf, cc);
+				(void)write(1, buf, cc);
 		}
-        } while (readfrom);
-	if (nflag == 0)
-		(void) kill(pid, SIGKILL);
-	exit(0);
-usage:
-	fprintf(stderr,
-#ifdef	KERBEROS
-	    "usage: rsh host [ -l login ] [ -n ] [ -k realm ] command\n");
-#else
-	    "usage: rsh host [ -l login ] [ -n ] command\n");
-#endif
-	exit(1);
+	} while (FD_ISSET(rfd2, &readfrom) || FD_ISSET(rem, &readfrom));
 }
 
-sendsig(signo)
+void
+sendsig(sig)
+	int sig;
+{
 	char signo;
+
+	signo = sig;
+#ifdef KERBEROS
+#endif
+		(void)write(rfd2, &signo, 1);
+}
+
+#ifdef KERBEROS
+/* VARARGS */
+void
+warning(va_alist)
+va_dcl
 {
+	va_list ap;
+	char *fmt;
 
-	(void) write(rfd2, &signo, 1);
+	(void)fprintf(stderr, "rsh: warning, using standard rsh: ");
+	va_start(ap);
+	fmt = va_arg(ap, char *);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+	(void)fprintf(stderr, ".\n");
 }
+#endif
 
-#ifdef	KERBEROS
-int
-old_warning(str)
-	char	*str;
+char *
+copyargs(argv)
+	char **argv;
 {
-	fprintf(stderr,"Warning: %s, using standard rsh\n", str);
+	int cc;
+	char **ap, *args, *p;
+
+	cc = 0;
+	for (ap = argv; *ap; ++ap)
+		cc += strlen(*ap) + 1;
+	if (!(args = malloc((u_int)cc)))
+		err(1, NULL);
+	for (p = args, ap = argv; *ap; ++ap) {
+		(void)strcpy(p, *ap);
+		for (p = strcpy(p, *ap); *p; ++p);
+		if (ap[1])
+			*p++ = ' ';
+	}
+	return (args);
 }
+
+void
+usage()
+{
+
+	(void)fprintf(stderr,
+	    "usage: rsh [-nd%s]%s[-l login] host [command]\n",
+#ifdef KERBEROS
+	    "", " [-k realm] ");
+#else
+	    "", " ");
 #endif
+	exit(1);
+}