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dumprmt.c

/*-
 * 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.
 * 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
#if 0
static char sccsid[] = "@(#)dumprmt.c     8.3 (Berkeley) 4/28/95";
#endif
static const char rcsid[] =
  "$FreeBSD: src/sbin/dump/dumprmt.c,v 1.22 2004/04/10 02:22:35 bde Exp $";
#endif /* not lint */

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

#include <ufs/ufs/dinode.h>

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

#include <protocols/dumprestore.h>

#include <ctype.h>
#include <netdb.h>
#include <pwd.h>
#include <stdio.h>
#include <limits.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#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(const char *);
static      int rmtcall(const char *, const char *);
static      void rmtconnaborted(int);
static      int rmtgetb(void);
static      void rmtgetconn(void);
static      void rmtgets(char *, int);
static      int rmtreply(const char *);

static      int errfd = -1;
extern      int ntrec;        /* blocking factor on tape */

int
rmthost(const char *host)
{

      rmtpeer = strdup(host);
      if (rmtpeer == NULL)
            return (0);
      signal(SIGPIPE, rmtconnaborted);
      rmtgetconn();
      if (rmtape < 0)
            return (0);
      return (1);
}

static void
rmtconnaborted(int sig __unused)
{
      msg("Lost connection to remote host.\n");
      if (errfd != -1) {
            fd_set r;
            struct timeval t;

            FD_ZERO(&r);
            FD_SET(errfd, &r);
            t.tv_sec = 0;
            t.tv_usec = 0;
            if (select(errfd + 1, &r, NULL, NULL, &t)) {
                  int i;
                  char buf[2048];

                  if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
                        buf[i] = '\0';
                        msg("on %s: %s%s", rmtpeer, buf,
                              buf[i - 1] == '\n' ? "" : "\n");
                  }
            }
      }

      exit(X_ABORT);
}

void
rmtgetconn(void)
{
      char *cp;
      const char *rmt;
      static struct servent *sp = NULL;
      static struct passwd *pwd = NULL;
      char *tuser;
      int size;
      int throughput;
      int on;

      if (sp == NULL) {
            sp = getservbyname("shell", "tcp");
            if (sp == NULL) {
                  msg("shell/tcp: unknown service\n");
                  exit(X_STARTUP);
            }
            pwd = getpwuid(getuid());
            if (pwd == NULL) {
                  msg("who are you?\n");
                  exit(X_STARTUP);
            }
      }
      if ((cp = strchr(rmtpeer, '@')) != NULL) {
            tuser = rmtpeer;
            *cp = '\0';
            if (!okname(tuser))
                  exit(X_STARTUP);
            rmtpeer = ++cp;
      } else
            tuser = pwd->pw_name;
      if ((rmt = getenv("RMT")) == NULL)
            rmt = _PATH_RMT;
      msg("%s", "");
      rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
                  tuser, rmt, &errfd);
      if (rmtape < 0) {
            msg("login to %s as %s failed.\n", rmtpeer, tuser);
            return;
      }
      (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
      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));
      throughput = IPTOS_THROUGHPUT;
      if (setsockopt(rmtape, IPPROTO_IP, IP_TOS,
          &throughput, sizeof(throughput)) < 0)
            perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
      on = 1;
      if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
            perror("TCP_NODELAY setsockopt");
}

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

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

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

      (void)snprintf(buf, sizeof (buf), "O%.226s\n%d\n", tape, mode);
      rmtstate = TS_OPEN;
      return (rmtcall(tape, buf));
}

void
rmtclose(void)
{

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

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

      (void)snprintf(line, sizeof (line), "R%d\n", count);
      n = rmtcall("read", line);
      if (n < 0)
            /* rmtcall() properly sets errno for us on errors. */
            return (n);
      for (i = 0; i < n; i += cc) {
            cc = read(rmtape, buf+i, n - i);
            if (cc <= 0)
                  rmtconnaborted(0);
      }
      return (n);
}

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

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

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

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

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

      write(rmtape, buf, count);
}

int
rmtwrite2(void)
{

      return (rmtreply("write"));
}

int
rmtseek(int offset, int pos)  /* XXX off_t ? */
{
      char line[80];

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

struct      mtget mts;

struct mtget *
rmtstatus(void)
{
      int i;
      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(int cmd, int count)
{
      char buf[256];

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

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

      if (write(rmtape, buf, strlen(buf)) != strlen(buf))
            rmtconnaborted(0);
      return (rmtreply(cmd));
}

static int
rmtreply(const char *cmd)
{
      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);
            errno = atoi(code + 1);
            if (*code == 'F')
                  rmtstate = TS_CLOSED;
            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(0);
      }
      return (atoi(code + 1));
}

int
rmtgetb(void)
{
      char c;

      if (read(rmtape, &c, 1) != 1)
            rmtconnaborted(0);
      return (c);
}

/* Get a line (guaranteed to have a trailing newline). */
void
rmtgets(char *line, int len)
{
      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(0);
}

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