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dumprmt.c

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.0 (the 'License').  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License."
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*-
 * Copyright (c) 1980, 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.
 */


#include <sys/param.h>
#include <sys/mtio.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>

#ifdef sunos
#include <sys/vnode.h>
#include <ufs/inode.h>
#else
#include <ufs/ufs/dinode.h>
#endif

#include <netinet/in.h>
#include <netinet/tcp.h>

#include <protocols/dumprestore.h>

#include <ctype.h>
#include <err.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <errno.h>

#ifdef __STDC__
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#endif

#include "pathnames.h"
#include "dump.h"

#define     TS_CLOSED   0
#define     TS_OPEN           1

static      int rmtstate = TS_CLOSED;
static      int rmtape;
static      char *rmtpeer;

static      int okname __P((char *));
static      int rmtcall __P((char *, char *));
static      void rmtconnaborted __P((/* int, int */));
static      int rmtgetb __P((void));
static      void rmtgetconn __P((void));
static      void rmtgets __P((char *, int));
static      int rmtreply __P((char *));

extern      int ntrec;        /* blocking factor on tape */

union u_spcl u_spcl;

int
rmthost(host)
      char *host;
{

      rmtpeer = malloc(strlen(host) + 1);
      if (rmtpeer)
            strcpy(rmtpeer, host);
      else
            rmtpeer = host;
      signal(SIGPIPE, rmtconnaborted);
      rmtgetconn();
      if (rmtape < 0)
            return (0);
      return (1);
}

static void
rmtconnaborted()
{

      errx(1, "Lost connection to remote host.");
}

void
rmtgetconn()
{
      register char *cp;
      static struct servent *sp = NULL;
      static struct passwd *pwd = NULL;
#ifdef notdef
      static int on = 1;
#endif
      char *tuser;
      int size;
      int maxseg;

      if (sp == NULL) {
            sp = getservbyname("shell", "tcp");
            if (sp == NULL)
                  errx(1, "shell/tcp: unknown service");
            pwd = getpwuid(getuid());
            if (pwd == NULL)
                  errx(1, "who are you?");
      }
      if ((cp = strchr(rmtpeer, '@')) != NULL) {
            tuser = rmtpeer;
            *cp = '\0';
            if (!okname(tuser))
                  exit(1);
            rmtpeer = ++cp;
      } else
            tuser = pwd->pw_name;
      rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name, tuser,
          _PATH_RMT, (int *)0);
      size = ntrec * TP_BSIZE;
      if (size > 60 * 1024)         /* XXX */
            size = 60 * 1024;
      /* Leave some space for rmt request/response protocol */
      size += 2 * 1024;
      while (size > TP_BSIZE &&
          setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
                size -= TP_BSIZE;
      (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
      maxseg = 1024;
      if (setsockopt(rmtape, IPPROTO_TCP, TCP_MAXSEG,
          &maxseg, sizeof (maxseg)) < 0)
            perror("TCP_MAXSEG setsockopt");

#ifdef notdef
      if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
            perror("TCP_NODELAY setsockopt");
#endif
}

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

      for (cp = cp0; *cp; cp++) {
            c = *cp;
            if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
                  warnx("invalid user name: %s", cp0);
                  return (0);
            }
      }
      return (1);
}

int
rmtopen(tape, mode)
      char *tape;
      int mode;
{
      char buf[256];

      (void)sprintf(buf, "O%s\n%d\n", tape, mode);
      rmtstate = TS_OPEN;
      return (rmtcall(tape, buf));
}

void
rmtclose()
{

      if (rmtstate != TS_OPEN)
            return;
      rmtcall("close", "C\n");
      rmtstate = TS_CLOSED;
}

int
rmtread(buf, count)
      char *buf;
      int count;
{
      char line[30];
      int n, i, cc;

      (void)sprintf(line, "R%d\n", count);
      n = rmtcall("read", line);
      if (n < 0) {
            errno = n;
            return (-1);
      }
      for (i = 0; i < n; i += cc) {
            cc = read(rmtape, buf+i, n - i);
            if (cc <= 0) {
                  rmtconnaborted();
            }
      }
      return (n);
}

int
rmtwrite(buf, count)
      char *buf;
      int count;
{
      char line[30];

      (void)sprintf(line, "W%d\n", count);
      write(rmtape, line, strlen(line));
      write(rmtape, buf, count);
      return (rmtreply("write"));
}

void
rmtwrite0(count)
      int count;
{
      char line[30];

      (void)sprintf(line, "W%d\n", count);
      write(rmtape, line, strlen(line));
}

void
rmtwrite1(buf, count)
      char *buf;
      int count;
{

      write(rmtape, buf, count);
}

int
rmtwrite2()
{

      return (rmtreply("write"));
}

int
rmtseek(offset, pos)
      int offset, pos;
{
      char line[80];

      (void)sprintf(line, "L%d\n%d\n", offset, pos);
      return (rmtcall("seek", line));
}

struct      mtget mts;

struct mtget *
rmtstatus()
{
      register int i;
      register char *cp;

      if (rmtstate != TS_OPEN)
            return (NULL);
      rmtcall("status", "S\n");
      for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
            *cp++ = rmtgetb();
      return (&mts);
}

int
rmtioctl(cmd, count)
      int cmd, count;
{
      char buf[256];

      if (count < 0)
            return (-1);
      (void)sprintf(buf, "I%d\n%d\n", cmd, count);
      return (rmtcall("ioctl", buf));
}

static int
rmtcall(cmd, buf)
      char *cmd, *buf;
{

      if (write(rmtape, buf, strlen(buf)) != strlen(buf))
            rmtconnaborted();
      return (rmtreply(cmd));
}

static int
rmtreply(cmd)
      char *cmd;
{
      register char *cp;
      char code[30], emsg[BUFSIZ];

      rmtgets(code, sizeof (code));
      if (*code == 'E' || *code == 'F') {
            rmtgets(emsg, sizeof (emsg));
            msg("%s: %s", cmd, emsg);
            if (*code == 'F') {
                  rmtstate = TS_CLOSED;
                  return (-1);
            }
            return (-1);
      }
      if (*code != 'A') {
            /* Kill trailing newline */
            cp = code + strlen(code);
            if (cp > code && *--cp == '\n')
                  *cp = '\0';

            msg("Protocol to remote tape server botched (code \"%s\").\n",
                code);
            rmtconnaborted();
      }
      return (atoi(code + 1));
}

int
rmtgetb()
{
      char c;

      if (read(rmtape, &c, 1) != 1)
            rmtconnaborted();
      return (c);
}

/* Get a line (guaranteed to have a trailing newline). */
void
rmtgets(line, len)
      char *line;
      int len;
{
      register char *cp = line;

      while (len > 1) {
            *cp = rmtgetb();
            if (*cp == '\n') {
                  cp[1] = '\0';
                  return;
            }
            cp++;
            len--;
      }
      *cp = '\0';
      msg("Protocol to remote tape server botched.\n");
      msg("(rmtgets got \"%s\").\n", line);
      rmtconnaborted();
}

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