add 1994 copyright

[unix-history] / 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 5b5877d..6e2c26d 100644 (file)
--- a/usr/src/usr.bin/rsh/rsh.c
+++ b/usr/src/usr.bin/rsh/rsh.c
@@ -1,225 +1,406 @@
+/*-
+ * Copyright (c) 1983, 1990, 1993, 1994
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * %sccs.include.redist.c%
+ */
+

 #ifndef lint
 #ifndef lint

-static char sccsid[] = "@(#)rsh.c      4.12 85/04/24";
-#endif
+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      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/types.h>

+#include <sys/signal.h>

 #include <sys/socket.h>
 #include <sys/ioctl.h>
 #include <sys/file.h>
 
 #include <netinet/in.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 <errno.h>

-#include <signal.h>

 #include <pwd.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 <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
  */
 
 /*
  * rsh - remote shell
  */

-/* VARARGS */
-int    error();
-char   *index(), *rindex(), *malloc(), *getpass(), *sprintf(), *strcpy();
-
-struct passwd *getpwuid();
-
-int    errno;
-int    options;

 int    rfd2;
 int    rfd2;

-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;
        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;
        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
        else

-               host = argv[0];
-       argv++, --argc;
-       if (!strcmp(host, "rsh")) {
-               host = *argv++, --argc;

                asrsh = 1;
                asrsh = 1;

+
+       /* handle "rsh host flags" */
+       if (!host && argc > 2 && argv[1][0] != '-') {
+               host = argv[1];
+               argoff = 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--;
-               (void) close(0);
-               (void) open("/dev/null", 0);
-               goto another;
-       }
-       if (argc > 0 && !strcmp(*argv, "-d")) {
-               argv++, argc--;
-               options |= SO_DEBUG;
-               goto another;
-       }
-       /*
-        * Ignore the -w, -e and -8 flags to allow aliases with rlogin
-        * to work
-        */
-       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;
-       }
-       if (host == 0)
-               goto usage;
-       if (argv[0] == 0) {
+
+#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 no further arguments, must have been called as rlogin. */
+       if (!argv[optind]) {

                if (asrsh)
                if (asrsh)

-                       *argv0 = "rlogin";
-               execv("/usr/ucb/rlogin", argv0);
-               perror("/usr/ucb/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);
+
+       argc -= optind;
+       argv += optind;
+
+       if (!(pw = getpwuid(uid = getuid())))
+               errx(1, "unknown user id");
+       if (!user)
+               user = pw->pw_name;
+
+#ifdef KERBEROS
+#endif
+
+       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");
+               }

        }
        }

-       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++ = ' ';
+#endif
+       if (sp == NULL)
+               sp = getservbyname("shell", "tcp");
+       if (sp == NULL)
+               errx(1, "shell/tcp: unknown service");
+
+#ifdef KERBEROS
+try_connect:
+       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;
+               errno = 0;
+               if (dest_realm == NULL)
+                       dest_realm = krb_realmofhost(host);
+
+                       rem = krcmd(&host, sp->s_port, user, args, &rfd2,
+                           dest_realm);
+               if (rem < 0) {
+                       use_kerberos = 0;
+                       sp = getservbyname("shell", "tcp");
+                       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 (doencrypt)
+                       errx(1, "the -x flag requires Kerberos authentication");
+               rem = rcmd(&host, sp->s_port, pw->pw_name, user, args, &rfd2);

        }
        }

-       sp = getservbyname("shell", "tcp");
-       if (sp == 0) {
-               fprintf(stderr, "rsh: shell/tcp: unknown service\n");
+#else
+       rem = rcmd(&host, sp->s_port, pw->pw_name, user, args, &rfd2);
+#endif
+
+       if (rem < 0)

                exit(1);
                exit(1);

+
+       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");

        }
        }

-        rem = rcmd(&host, sp->s_port, pwd->pw_name,
-           user ? user : pwd->pw_name, args, &rfd2);
-        if (rem < 0)
-                exit(1);
-       if (rfd2 < 0) {
-               fprintf(stderr, "rsh: can't establish stderr\n");
-               exit(2);
+
+       (void)setuid(uid);
+       omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGTERM));
+       if (signal(SIGINT, SIG_IGN) != SIG_IGN)
+               (void)signal(SIGINT, sendsig);
+       if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
+               (void)signal(SIGQUIT, sendsig);
+       if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
+               (void)signal(SIGTERM, sendsig);
+
+       if (!nflag) {
+               pid = fork();
+               if (pid < 0)
+                       err(1, "fork");

        }
        }

-       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)");
+
+#ifdef KERBEROS
+#endif
+       {
+               (void)ioctl(rfd2, FIONBIO, &one);
+               (void)ioctl(rem, FIONBIO, &one);

        }
        }

-       (void) setuid(getuid());
-       omask = sigblock(mask(SIGINT)|mask(SIGQUIT)|mask(SIGTERM));
-       signal(SIGINT, sendsig);
-       signal(SIGQUIT, sendsig);
-       signal(SIGTERM, sendsig);
-        pid = fork();
-        if (pid < 0) {
-               perror("fork");
-                exit(1);
-        }
-       ioctl(rfd2, FIONBIO, &one);
-       ioctl(rem, FIONBIO, &one);
-        if (pid == 0) {
-               char *bp; int rembits, wc;
-               (void) close(rfd2);
-       reread:
-               errno = 0;
-               cc = read(0, buf, sizeof buf);
-               if (cc <= 0)
+
+       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;
                        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 (select(16, 0, &rembits, 0, 0) < 0) {

-                       if (errno != EINTR) {
-                               perror("select");
-                               exit(1);
-                       }
+                       if (errno != EINTR)
+                               err(1, "select");

                        goto rewrite;
                }
                        goto rewrite;
                }

-               if ((rembits & (1<<rem)) == 0)
+               if (!FD_ISSET(rem, &rembits))

                        goto rewrite;
                        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;
                }
                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;
                if (cc == 0)
                        goto reread;
                goto rewrite;

-       done:
-               (void) shutdown(rem, 1);
+done:
+               (void)shutdown(rem, 1);

                exit(0);
        }
                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) {
        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;
                }
                        continue;
                }

-               if (ready & (1<<rfd2)) {
+               if (FD_ISSET(rfd2, &ready)) {

                        errno = 0;
                        errno = 0;

-                       cc = read(rfd2, buf, sizeof buf);
+#ifdef KERBEROS
+#endif
+                               cc = read(rfd2, buf, sizeof buf);

                        if (cc <= 0) {
                                if (errno != EWOULDBLOCK)
                        if (cc <= 0) {
                                if (errno != EWOULDBLOCK)

-                                       readfrom &= ~(1<<rfd2);
+                                       FD_CLR(rfd2, &readfrom);

                        } else
                        } else

-                               (void) write(2, buf, cc);
+                               (void)write(2, buf, cc);

                }
                }

-               if (ready & (1<<rem)) {
+               if (FD_ISSET(rem, &ready)) {

                        errno = 0;
                        errno = 0;

-                       cc = read(rem, buf, sizeof buf);
+#ifdef KERBEROS
+#endif
+                               cc = read(rem, buf, sizeof buf);

                        if (cc <= 0) {
                                if (errno != EWOULDBLOCK)
                        if (cc <= 0) {
                                if (errno != EWOULDBLOCK)

-                                       readfrom &= ~(1<<rem);
+                                       FD_CLR(rem, &readfrom);

                        } else
                        } else

-                               (void) write(1, buf, cc);
+                               (void)write(1, buf, cc);

                }
                }

-        } while (readfrom);
-        (void) kill(pid, SIGKILL);
-       exit(0);
-usage:
-       fprintf(stderr,
-           "usage: rsh host [ -l login ] [ -p passwd ] command\n");
-       exit(1);
+       } while (FD_ISSET(rfd2, &readfrom) || FD_ISSET(rem, &readfrom));

 }
 
 }
 

-sendsig(signo)
+void
+sendsig(sig)
+       int sig;
+{

        char signo;
        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)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

 
 

-       (void) write(rfd2, &signo, 1);
+char *
+copyargs(argv)
+       char **argv;
+{
+       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);

 }
 }