BSD 4_3_Net_2 release

[unix-history] / Domestic / src / rcp / rcp.c

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

#ifndef lint
static char sccsid[] = "@(#)rcp.c       5.32 (Berkeley) 2/25/91";
#endif /* not lint */

/*
* rcp
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <dirent.h>
#include <fcntl.h>
#include <signal.h>
#include <pwd.h>
#include <netdb.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "pathnames.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 "dfk:prtx"
#else
#define OPTIONS "dfk: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" */

typedef struct _buf {
       int     cnt;
       char    *buf;
} BUF;

void lostconn();

main(argc, argv)
       int argc;
       char **argv;
{
       extern int optind;
       extern char *optarg;
       struct servent *sp;
       int ch, fflag, tflag;
       char *targ, *shell, *colon();

       fflag = tflag = 0;
       while ((ch = getopt(argc, argv, OPTIONS)) != EOF)
               switch(ch) {
               /* user-visible flags */
               case 'p':                       /* preserve access/mod times */
                       ++pflag;
                       break;
               case 'r':
                       ++iamrecursive;
                       break;
#ifdef  KERBEROS
               case 'k':
                       strncpy(dst_realm_buf, optarg, REALM_SZ);
                       dest_realm = dst_realm_buf;
                       break;
#ifdef CRYPT
               case 'x':
                       doencrypt = 1;
                       /* des_set_key(cred.session, schedule); */
                       break;
#endif
#endif
               /* rshd-invoked options (server) */
               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
#ifdef CRYPT
       shell = doencrypt ? "ekshell" : "kshell";
#else
       shell = "kshell";
#endif
       sp = getservbyname(shell, "tcp");
       if (sp == NULL) {
               char    msgbuf[64];
               use_kerberos = 0;
               (void)snprintf(msgbuf, sizeof(msgbuf),
                   "can't get entry for %s/tcp service", shell);
               old_warning(msgbuf);
               sp = getservbyname(shell = "shell", "tcp");
       }
#else
       sp = getservbyname(shell = "shell", "tcp");
#endif
       if (sp == NULL) {
               (void)fprintf(stderr, "rcp: %s/tcp: unknown service\n", shell);
               exit(1);
       }
       port = sp->s_port;

       if (!(pwd = getpwuid(userid = getuid()))) {
               (void)fprintf(stderr, "rcp: unknown user %d.\n", (int)userid);
               exit(1);
       }

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

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

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

       if (thost = index(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 = index(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)))
                               nospace();
                       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,
                                   "%s %s -n %s %s '%s%s%s:%s'",
                                   _PATH_RSH, argv[i], cmd, src,
                                   tuser ? tuser : "", tuser ? "@" : "",
                                   thost, targ);
                       (void)susystem(bp);
                       (void)free(bp);
               } else {                        /* local to remote */
                       if (rem == -1) {
                               len = strlen(targ) + CMDNEEDS + 20;
                               if (!(bp = malloc(len)))
                                       nospace();
                               (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,
                                   (char *)&tos, sizeof(int)) < 0)
                                       perror("rcp: setsockopt TOS (ignored)");
                               if (response() < 0)
                                       exit(1);
                               (void)free(bp);
                               (void)setuid(userid);
                       }
                       source(1, argv+i);
               }
       }
}

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

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

verifydir(cp)
       char *cp;
{
       struct stat stb;

       if (stat(cp, &stb) >= 0) {
               if ((stb.st_mode & S_IFMT) == S_IFDIR)
                       return;
               errno = ENOTDIR;
       }
       error("rcp: %s: %s.\n", cp, strerror(errno));
       exit(1);
}

char *
colon(cp)
       register char *cp;
{
       for (; *cp; ++cp) {
               if (*cp == ':')
                       return(cp);
               if (*cp == '/')
                       return(0);
       }
       return(0);
}

okname(cp0)
       char *cp0;
{
       register char *cp = cp0;
       register int c;

       do {
               c = *cp;
               if (c & 0200)
                       goto bad;
               if (!isalpha(c) && !isdigit(c) && c != '_' && c != '-')
                       goto bad;
       } while (*++cp);
       return(1);
bad:
       (void)fprintf(stderr, "rcp: invalid user name %s\n", cp0);
       return(0);
}

susystem(s)
       char *s;
{
       int status, pid, w;
       register sig_t istat, qstat;

       if ((pid = vfork()) == 0) {
               (void)setuid(userid);
               execl(_PATH_BSHELL, "sh", "-c", s, (char *)0);
               _exit(127);
       }
       istat = signal(SIGINT, SIG_IGN);
       qstat = signal(SIGQUIT, SIG_IGN);
       while ((w = wait(&status)) != pid && w != -1)
               ;
       if (w == -1)
               status = -1;
       (void)signal(SIGINT, istat);
       (void)signal(SIGQUIT, qstat);
       return(status);
}

source(argc, argv)
       int argc;
       char **argv;
{
       struct stat stb;
       static BUF buffer;
       BUF *bp;
       off_t i;
       int x, readerr, f, amt;
       char *last, *name, buf[BUFSIZ];
       BUF *allocbuf();

       for (x = 0; x < argc; x++) {
               name = argv[x];
               if ((f = open(name, O_RDONLY, 0)) < 0) {
                       error("rcp: %s: %s\n", name, strerror(errno));
                       continue;
               }
               if (fstat(f, &stb) < 0)
                       goto notreg;
               switch (stb.st_mode&S_IFMT) {

               case S_IFREG:
                       break;

               case S_IFDIR:
                       if (iamrecursive) {
                               (void)close(f);
                               rsource(name, &stb);
                               continue;
                       }
                       /* FALLTHROUGH */
               default:
notreg:                 (void)close(f);
                       error("rcp: %s: not a plain file\n", name);
                       continue;
               }
               last = rindex(name, '/');
               if (last == 0)
                       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_mtime, stb.st_atime);
                       (void)write(rem, buf, (int)strlen(buf));
                       if (response() < 0) {
                               (void)close(f);
                               continue;
                       }
               }
               (void)snprintf(buf, sizeof(buf),
                   "C%04o %ld %s\n", stb.st_mode&07777, stb.st_size, last);
               (void)write(rem, buf, (int)strlen(buf));
               if (response() < 0) {
                       (void)close(f);
                       continue;
               }
               if ((bp = allocbuf(&buffer, f, BUFSIZ)) == 0) {
                       (void)close(f);
                       continue;
               }
               readerr = 0;
               for (i = 0; i < stb.st_size; i += bp->cnt) {
                       amt = bp->cnt;
                       if (i + amt > stb.st_size)
                               amt = stb.st_size - i;
                       if (readerr == 0 && read(f, bp->buf, amt) != amt)
                               readerr = errno;
                       (void)write(rem, bp->buf, amt);
               }
               (void)close(f);
               if (readerr == 0)
                       (void)write(rem, "", 1);
               else
                       error("rcp: %s: %s\n", name, strerror(readerr));
               (void)response();
       }
}

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

       if (!(dirp = opendir(name))) {
               error("rcp: %s: %s\n", name, strerror(errno));
               return;
       }
       last = rindex(name, '/');
       if (last == 0)
               last = name;
       else
               last++;
       if (pflag) {
               (void)snprintf(path, sizeof(path),
                   "T%ld 0 %ld 0\n", statp->st_mtime, statp->st_atime);
               (void)write(rem, path, (int)strlen(path));
               if (response() < 0) {
                       closedir(dirp);
                       return;
               }
       }
       (void)snprintf(path, sizeof(path),
           "D%04o %d %s\n", statp->st_mode&07777, 0, last);
       (void)write(rem, path, (int)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) {
                       error("%s/%s: name too long.\n", name, dp->d_name);
                       continue;
               }
               (void)snprintf(path, sizeof(path), "%s/%s", name, dp->d_name);
               vect[0] = path;
               source(1, vect);
       }
       closedir(dirp);
       (void)write(rem, "E\n", 2);
       (void)response();
}

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

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

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

               if (!iamremote)
                       (void)write(2, rbuf, cp - rbuf);
               ++errs;
               if (resp == 1)
                       return(-1);
               exit(1);
       }
       /*NOTREACHED*/
}

void
lostconn()
{
       if (!iamremote)
               (void)fprintf(stderr, "rcp: lost connection\n");
       exit(1);
}

sink(argc, argv)
       int argc;
       char **argv;
{
       register char *cp;
       static BUF buffer;
       struct stat stb;
       struct timeval tv[2];
       enum { YES, NO, DISPLAYED } wrerr;
       BUF *bp, *allocbuf();
       off_t i, j;
       char ch, *targ, *why;
       int amt, count, exists, first, mask, mode;
       int ofd, setimes, size, targisdir;
       char *np, *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) {
               error("rcp: ambiguous target\n");
               exit(1);
       }
       targ = *argv;
       if (targetshouldbedirectory)
               verifydir(targ);
       (void)write(rem, "", 1);
       if (stat(targ, &stb) == 0 && (stb.st_mode & S_IFMT) == S_IFDIR)
               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(2, buf + 1, (int)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) {
                               error("%s\n", 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");
               size = 0;
               while (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)))
                                       error("out of memory\n");
                       }
                       (void)snprintf(namebuf, need, "%s%s%s", targ,
                           *targ ? "/" : "", cp);
                       np = namebuf;
               }
               else
                       np = targ;
               exists = stat(np, &stb) == 0;
               if (buf[0] == 'D') {
                       if (exists) {
                               if ((stb.st_mode&S_IFMT) != S_IFDIR) {
                                       errno = ENOTDIR;
                                       goto bad;
                               }
                               if (pflag)
                                       (void)chmod(np, mode);
                       } else if (mkdir(np, mode) < 0)
                               goto bad;
                       vect[0] = np;
                       sink(1, vect);
                       if (setimes) {
                               setimes = 0;
                               if (utimes(np, tv) < 0)
                                   error("rcp: can't set times on %s: %s\n",
                                       np, strerror(errno));
                       }
                       continue;
               }
               if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) < 0) {
bad:                    error("rcp: %s: %s\n", np, strerror(errno));
                       continue;
               }
               if (exists && pflag)
                       (void)fchmod(ofd, mode);
               (void)write(rem, "", 1);
               if ((bp = allocbuf(&buffer, ofd, BUFSIZ)) == 0) {
                       (void)close(ofd);
                       continue;
               }
               cp = bp->buf;
               count = 0;
               wrerr = NO;
               for (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) {
                                       error("rcp: %s\n",
                                           j ? strerror(errno) :
                                           "dropped connection");
                                       exit(1);
                               }
                               amt -= j;
                               cp += j;
                       } while (amt > 0);
                       if (count == bp->cnt) {
                               if (wrerr == NO &&
                                   write(ofd, bp->buf, count) != count)
                                       wrerr = YES;
                               count = 0;
                               cp = bp->buf;
                       }
               }
               if (count != 0 && wrerr == NO &&
                   write(ofd, bp->buf, count) != count)
                       wrerr = YES;
               if (ftruncate(ofd, size)) {
                       error("rcp: can't truncate %s: %s\n", np,
                           strerror(errno));
                       wrerr = DISPLAYED;
               }
               (void)close(ofd);
               (void)response();
               if (setimes && wrerr == NO) {
                       setimes = 0;
                       if (utimes(np, tv) < 0) {
                               error("rcp: can't set times on %s: %s\n",
                                   np, strerror(errno));
                               wrerr = DISPLAYED;
                       }
               }
               switch(wrerr) {
               case YES:
                       error("rcp: %s: %s\n", np, strerror(errno));
                       break;
               case NO:
                       (void)write(rem, "", 1);
                       break;
               case DISPLAYED:
                       break;
               }
       }
screwup:
       error("rcp: protocol screwup: %s\n", why);
       exit(1);
}

BUF *
allocbuf(bp, fd, blksize)
       BUF *bp;
       int fd, blksize;
{
       struct stat stb;
       size_t size;

       if (fstat(fd, &stb) < 0) {
               error("rcp: fstat: %s\n", strerror(errno));
               return(0);
       }
       size = roundup(stb.st_blksize, blksize);
       if (size == 0)
               size = blksize;
       if (bp->cnt < size) {
               if (bp->buf != 0)
                       free(bp->buf);
               bp->buf = malloc(size);
               if (!bp->buf) {
                       error("rcp: malloc: out of memory\n");
                       return(0);
               }
       }
       bp->cnt = size;
       return(bp);
}

/* VARARGS1 */
error(fmt, a1, a2, a3)
       char *fmt;
       int a1, a2, a3;
{
       static FILE *fp;

       ++errs;
       if (!fp && !(fp = fdopen(rem, "w")))
               return;
       (void)fprintf(fp, "%c", 0x01);
       (void)fprintf(fp, fmt, a1, a2, a3);
       (void)fflush(fp);
       if (!iamremote)
               (void)fprintf(stderr, fmt, a1, a2, a3);
}

nospace()
{
       (void)fprintf(stderr, "rcp: out of memory.\n");
       exit(1);
}


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

#ifdef KERBEROS
old_warning(str)
       char *str;
{
       (void)fprintf(stderr, "rcp: warning: %s, using standard rcp\n", str);
}

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);

#ifdef CRYPT
               if (doencrypt)
                       rem = krcmd_mutual(
                               host, port,
                               user, bp, 0,
                               dest_realm,
                               &cred, schedule);
               else
#endif
                       rem = krcmd(
                               host, port,
                               user, bp, 0, dest_realm);

               if (rem < 0) {
                       use_kerberos = 0;
                       sp = getservbyname("shell", "tcp");
                       if (sp == NULL) {
                               (void)fprintf(stderr,
                                   "rcp: unknown service shell/tcp\n");
                               exit(1);
                       }
                       if (errno == ECONNREFUSED)
                               old_warning(
                                   "remote host doesn't support Kerberos");

                       if (errno == ENOENT)
                               old_warning(
                                   "Can't provide Kerberos auth data");
                       port = sp->s_port;
                       goto again;
               }
       } else {
#ifdef CRYPT
               if (doencrypt) {
                       fprintf(stderr,
                           "The -x option requires Kerberos authentication\n");
                       exit(1);
               }
#endif
               rem = rcmd(host, sp->s_port, locuser, user, bp, 0);
       }
       return(rem);
}
#endif /* KERBEROS */