OpenBSD-4.6/sbin/dump/dumprmt.c
/* $OpenBSD: dumprmt.c,v 1.25 2008/01/02 12:59:35 chl Exp $ */
/* $NetBSD: dumprmt.c,v 1.17 1997/06/05 16:10:47 mrg Exp $ */
/*-
* 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. 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 8.1 (Berkeley) 6/5/93";
#else
static const char rcsid[] = "$OpenBSD: dumprmt.c,v 1.25 2008/01/02 12:59:35 chl Exp $";
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/mtio.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <ufs/ufs/dinode.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <protocols/dumprestore.h>
#include <ctype.h>
#include <err.h>
#include <netdb.h>
#include <errno.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.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(char *);
static int rmtcall(char *, char *);
static void rmtconnaborted(int);
static int rmtgetb(void);
static void rmtgetconn(void);
static void rmtgets(char *, int);
static int rmtreply(char *);
extern int ntrec; /* blocking factor on tape */
int
rmthost(char *host)
{
int len = strlen(host) + 1;
rmtpeer = malloc(len);
if (rmtpeer)
strlcpy(rmtpeer, host, len);
else
rmtpeer = host;
signal(SIGPIPE, rmtconnaborted);
rmtgetconn();
if (rmtape < 0)
return (0);
return (1);
}
/* ARGSUSED */
static void
rmtconnaborted(int signo)
{
/* XXX signal race */
errx(X_ABORT, "Lost connection to remote host.");
}
void
rmtgetconn(void)
{
char *cp;
static struct servent *sp = NULL;
static struct passwd *pwd = NULL;
static int on = 1;
char *tuser, *name;
int size;
int maxseg;
if (sp == NULL) {
sp = getservbyname("shell", "tcp");
if (sp == NULL)
errx(X_STARTUP, "shell/tcp: unknown service");
pwd = getpwuid(getuid());
if (pwd == NULL)
errx(X_STARTUP, "who are you?");
}
if ((name = strdup(pwd->pw_name)) == NULL)
err(X_STARTUP, "malloc");
if ((cp = strchr(rmtpeer, '@')) != NULL) {
tuser = rmtpeer;
*cp = '\0';
if (!okname(tuser))
exit(X_STARTUP);
rmtpeer = ++cp;
} else
tuser = name;
rmtape = rcmd(&rmtpeer, sp->s_port, name, tuser, _PATH_RMT, NULL);
(void)free(name);
if (rmtape < 0)
return;
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;
(void)setsockopt(rmtape, IPPROTO_TCP, TCP_MAXSEG, &maxseg,
sizeof(maxseg));
(void) setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on));
}
static int
okname(char *cp0)
{
char *cp;
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(char *tape, int mode)
{
char buf[256];
(void)snprintf(buf, sizeof(buf), "O%s\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) {
errno = n;
return (-1);
}
for (i = 0; i < n; i += cc) {
cc = read(rmtape, buf+i, n - i);
if (cc <= 0) {
rmtconnaborted(0);
}
}
return (n);
}
int
rmtwrite(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"));
}
int
rmtseek(int offset, int pos)
{
char line[80];
(void)snprintf(line, sizeof(line), "L%d\n%d\n", offset, pos);
return (rmtcall("seek", line));
}
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(char *cmd, char *buf)
{
if (write(rmtape, buf, strlen(buf)) != strlen(buf))
rmtconnaborted(0);
return (rmtreply(cmd));
}
static int
rmtreply(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);
}