953 lines
16 KiB
C
953 lines
16 KiB
C
/* $NetBSD: rmtlib.c,v 1.8 1997/10/10 08:45:33 mrg Exp $ */
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/*
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* rmt --- remote tape emulator subroutines
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*
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* Originally written by Jeff Lee, modified some by Arnold Robbins
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*
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* WARNING: The man page rmt(8) for /etc/rmt documents the remote mag
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* tape protocol which rdump and rrestore use. Unfortunately, the man
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* page is *WRONG*. The author of the routines I'm including originally
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* wrote his code just based on the man page, and it didn't work, so he
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* went to the rdump source to figure out why. The only thing he had to
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* change was to check for the 'F' return code in addition to the 'E',
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* and to separate the various arguments with \n instead of a space. I
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* personally don't think that this is much of a problem, but I wanted to
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* point it out.
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* -- Arnold Robbins
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*
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* Redone as a library that can replace open, read, write, etc, by
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* Fred Fish, with some additional work by Arnold Robbins.
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*/
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/*
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* MAXUNIT --- Maximum number of remote tape file units
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*
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* READ --- Return the number of the read side file descriptor
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* WRITE --- Return the number of the write side file descriptor
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*/
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#define RMTIOCTL 1
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/* #define USE_REXEC 1 */ /* rexec code courtesy of Dan Kegel, srs!dan */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/types.h>
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#ifdef RMTIOCTL
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#include <sys/ioctl.h>
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#include <sys/mtio.h>
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#endif
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#ifdef USE_REXEC
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#include <netdb.h>
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#endif
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#include <errno.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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static int _rmt_close __P((int));
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static int _rmt_ioctl __P((int, unsigned long, char *));
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static off_t _rmt_lseek __P((int, off_t, int));
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static int _rmt_open __P((const char *, int, int));
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static int _rmt_read __P((int, char *, unsigned int));
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static int _rmt_write __P((int, const void *, unsigned int));
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static int command __P((int, char *));
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static int remdev __P((const char *));
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static void rmtabort __P((int));
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static int status __P((int));
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int isrmt __P((int));
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int rmtaccess __P((const char *, int));
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int rmtclose __P((int));
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int rmtcreat __P((const char *, mode_t));
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int rmtdup __P((int));
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int rmtfcntl __P((int, int, int));
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int rmtfstat __P((int, struct stat *));
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int rmtioctl __P((int, unsigned long, char *));
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int rmtisatty __P((int));
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off_t rmtlseek __P((int, off_t, int));
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int rmtlstat __P((const char *, struct stat *));
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int rmtopen __P((const char *, int, mode_t));
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ssize_t rmtread __P((int, void *, size_t));
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int rmtstat __P((const char *, struct stat *));
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ssize_t rmtwrite __P((int, const void *, size_t));
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#define BUFMAGIC 64 /* a magic number for buffer sizes */
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#define MAXUNIT 4
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#define READ(fd) (Ctp[fd][0])
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#define WRITE(fd) (Ptc[fd][1])
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static int Ctp[MAXUNIT][2] = { {-1, -1}, {-1, -1}, {-1, -1}, {-1, -1} };
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static int Ptc[MAXUNIT][2] = { {-1, -1}, {-1, -1}, {-1, -1}, {-1, -1} };
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/*
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* rmtabort --- close off a remote tape connection
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*/
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static void
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rmtabort(fildes)
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int fildes;
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{
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close(READ(fildes));
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close(WRITE(fildes));
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READ(fildes) = -1;
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WRITE(fildes) = -1;
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}
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/*
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* command --- attempt to perform a remote tape command
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*/
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static int
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command(fildes, buf)
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int fildes;
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char *buf;
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{
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int blen;
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void (*pstat) __P((int));
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/*
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* save current pipe status and try to make the request
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*/
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blen = strlen(buf);
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pstat = signal(SIGPIPE, SIG_IGN);
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if (write(WRITE(fildes), buf, blen) == blen)
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{
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signal(SIGPIPE, pstat);
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return(0);
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}
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/*
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* something went wrong. close down and go home
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*/
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signal(SIGPIPE, pstat);
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rmtabort(fildes);
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errno = EIO;
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return(-1);
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}
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/*
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* status --- retrieve the status from the pipe
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*/
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static int
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status(fildes)
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int fildes;
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{
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int i;
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char c, *cp;
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char buffer[BUFMAGIC];
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/*
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* read the reply command line
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*/
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for (i = 0, cp = buffer; i < BUFMAGIC; i++, cp++)
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{
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if (read(READ(fildes), cp, 1) != 1)
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{
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rmtabort(fildes);
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errno = EIO;
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return(-1);
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}
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if (*cp == '\n')
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{
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*cp = 0;
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break;
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}
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}
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if (i == BUFMAGIC)
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{
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rmtabort(fildes);
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errno = EIO;
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return(-1);
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}
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/*
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* check the return status
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*/
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for (cp = buffer; *cp; cp++)
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if (*cp != ' ')
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break;
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if (*cp == 'E' || *cp == 'F')
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{
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errno = atoi(cp + 1);
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while (read(READ(fildes), &c, 1) == 1)
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if (c == '\n')
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break;
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if (*cp == 'F')
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rmtabort(fildes);
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return(-1);
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}
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/*
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* check for mis-synced pipes
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*/
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if (*cp != 'A')
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{
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rmtabort(fildes);
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errno = EIO;
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return(-1);
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}
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return(atoi(cp + 1));
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}
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#ifdef USE_REXEC
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/*
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* _rmt_rexec
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*
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* execute /etc/rmt on a remote system using rexec().
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* Return file descriptor of bidirectional socket for stdin and stdout
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* If username is NULL, or an empty string, uses current username.
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*
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* ADR: By default, this code is not used, since it requires that
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* the user have a .netrc file in his/her home directory, or that the
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* application designer be willing to have rexec prompt for login and
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* password info. This may be unacceptable, and .rhosts files for use
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* with rsh are much more common on BSD systems.
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*/
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static int _rmt_rexec __P((const char *, const char *));
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static int
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_rmt_rexec(host, user)
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const char *host;
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const char *user; /* may be NULL */
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{
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struct servent *rexecserv;
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rexecserv = getservbyname("exec", "tcp");
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if (NULL == rexecserv) {
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fprintf (stderr, "? exec/tcp: service not available.");
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exit (-1);
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}
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if ((user != NULL) && *user == '\0')
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user = (char *) NULL;
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return rexec (&host, rexecserv->s_port, user, NULL,
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"/etc/rmt", (int *)NULL);
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}
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#endif /* USE_REXEC */
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/*
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* _rmt_open --- open a magtape device on system specified, as given user
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*
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* file name has the form [user@]system:/dev/????
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#ifdef COMPAT
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* file name has the form system[.user]:/dev/????
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#endif
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*/
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#define MAXHOSTLEN 257 /* BSD allows very long host names... */
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static int
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_rmt_open(path, oflag, mode)
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const char *path;
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int oflag;
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int mode;
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{
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int i, rc;
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char buffer[BUFMAGIC];
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char system[MAXHOSTLEN];
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char device[BUFMAGIC];
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char login[BUFMAGIC];
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char *sys, *dev, *user;
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sys = system;
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dev = device;
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user = login;
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/*
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* first, find an open pair of file descriptors
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*/
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for (i = 0; i < MAXUNIT; i++)
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if (READ(i) == -1 && WRITE(i) == -1)
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break;
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if (i == MAXUNIT)
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{
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errno = EMFILE;
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return(-1);
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}
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/*
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* pull apart system and device, and optional user
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* don't munge original string
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* if COMPAT is defined, also handle old (4.2) style person.site notation.
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*/
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while (*path != '@'
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#ifdef COMPAT
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&& *path != '.'
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#endif
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&& *path != ':') {
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*sys++ = *path++;
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}
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*sys = '\0';
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path++;
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if (*(path - 1) == '@')
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{
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(void)strncpy(user, system, sizeof(login) - 1);
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/* saw user part of user@host */
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sys = system; /* start over */
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while (*path != ':') {
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*sys++ = *path++;
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}
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*sys = '\0';
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path++;
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}
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#ifdef COMPAT
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else if (*(path - 1) == '.')
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{
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while (*path != ':') {
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*user++ = *path++;
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}
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*user = '\0';
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path++;
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}
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#endif
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else
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*user = '\0';
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while (*path) {
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*dev++ = *path++;
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}
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*dev = '\0';
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#ifdef USE_REXEC
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/*
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* Execute the remote command using rexec
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*/
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READ(i) = WRITE(i) = _rmt_rexec(system, login);
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if (READ(i) < 0)
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return -1;
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#else
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/*
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* setup the pipes for the 'rsh' command and fork
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*/
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if (pipe(Ptc[i]) == -1 || pipe(Ctp[i]) == -1)
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return(-1);
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if ((rc = fork()) == -1)
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return(-1);
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if (rc == 0)
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{
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close(0);
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dup(Ptc[i][0]);
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close(Ptc[i][0]); close(Ptc[i][1]);
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close(1);
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dup(Ctp[i][1]);
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close(Ctp[i][0]); close(Ctp[i][1]);
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(void) setuid (getuid ());
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(void) setgid (getgid ());
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if (*login)
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{
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execl("/usr/bin/rsh", "rsh", system, "-l", login,
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"/etc/rmt", (char *) 0);
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}
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else
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{
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execl("/usr/bin/rsh", "rsh", system,
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"/etc/rmt", (char *) 0);
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}
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/*
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* bad problems if we get here
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*/
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perror("exec");
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exit(1);
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}
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close(Ptc[i][0]); close(Ctp[i][1]);
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#endif
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/*
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* now attempt to open the tape device
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*/
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(void)snprintf(buffer, sizeof(buffer), "O%s\n%d\n", device, oflag);
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if (command(i, buffer) == -1 || status(i) == -1)
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return(-1);
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return(i);
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}
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/*
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* _rmt_close --- close a remote magtape unit and shut down
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*/
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static int
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_rmt_close(fildes)
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int fildes;
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{
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int rc;
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if (command(fildes, "C\n") != -1)
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{
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rc = status(fildes);
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rmtabort(fildes);
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return(rc);
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}
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return(-1);
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}
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/*
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* _rmt_read --- read a buffer from a remote tape
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*/
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static int
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_rmt_read(fildes, buf, nbyte)
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int fildes;
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char *buf;
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unsigned int nbyte;
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{
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int rc, i;
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char buffer[BUFMAGIC];
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(void)snprintf(buffer, sizeof buffer, "R%d\n", nbyte);
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if (command(fildes, buffer) == -1 || (rc = status(fildes)) == -1)
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return(-1);
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for (i = 0; i < rc; i += nbyte, buf += nbyte)
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{
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nbyte = read(READ(fildes), buf, rc);
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if (nbyte <= 0)
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{
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rmtabort(fildes);
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errno = EIO;
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return(-1);
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}
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}
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return(rc);
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}
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/*
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* _rmt_write --- write a buffer to the remote tape
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*/
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static int
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_rmt_write(fildes, buf, nbyte)
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int fildes;
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const void *buf;
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unsigned int nbyte;
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{
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char buffer[BUFMAGIC];
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void (*pstat) __P((int));
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(void)snprintf(buffer, sizeof buffer, "W%d\n", nbyte);
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if (command(fildes, buffer) == -1)
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return(-1);
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pstat = signal(SIGPIPE, SIG_IGN);
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if (write(WRITE(fildes), buf, nbyte) == nbyte)
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{
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signal (SIGPIPE, pstat);
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return(status(fildes));
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}
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signal (SIGPIPE, pstat);
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rmtabort(fildes);
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errno = EIO;
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return(-1);
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}
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/*
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* _rmt_lseek --- perform an imitation lseek operation remotely
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*/
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static off_t
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_rmt_lseek(fildes, offset, whence)
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int fildes;
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off_t offset;
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int whence;
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{
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char buffer[BUFMAGIC];
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(void)snprintf(buffer, sizeof buffer, "L%qd\n%d\n", (long long)offset,
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whence);
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if (command(fildes, buffer) == -1)
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return(-1);
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return(status(fildes));
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}
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/*
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* _rmt_ioctl --- perform raw tape operations remotely
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*/
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#ifdef RMTIOCTL
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static int
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_rmt_ioctl(fildes, op, arg)
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int fildes;
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unsigned long op;
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char *arg;
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{
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char c;
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int rc, cnt;
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char buffer[BUFMAGIC];
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/*
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* MTIOCOP is the easy one. nothing is transfered in binary
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*/
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if (op == MTIOCTOP)
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{
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(void)snprintf(buffer, sizeof buffer, "I%d\n%d\n",
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((struct mtop *)arg)->mt_op,
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((struct mtop *)arg)->mt_count);
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if (command(fildes, buffer) == -1)
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return(-1);
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return(status(fildes));
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}
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/*
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* we can only handle 2 ops, if not the other one, punt
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*/
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if (op != MTIOCGET)
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{
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errno = EINVAL;
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return(-1);
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}
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/*
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* grab the status and read it directly into the structure
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* this assumes that the status buffer is (hopefully) not
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* padded and that 2 shorts fit in a long without any word
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* alignment problems, ie - the whole struct is contiguous
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* NOTE - this is probably NOT a good assumption.
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*/
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if (command(fildes, "S") == -1 || (rc = status(fildes)) == -1)
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return(-1);
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for (; rc > 0; rc -= cnt, arg += cnt)
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{
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cnt = read(READ(fildes), arg, rc);
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if (cnt <= 0)
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{
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rmtabort(fildes);
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errno = EIO;
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return(-1);
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}
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}
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/*
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* now we check for byte position. mt_type is a small integer field
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* (normally) so we will check its magnitude. if it is larger than
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* 256, we will assume that the bytes are swapped and go through
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* and reverse all the bytes
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*/
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if (((struct mtget *) arg)->mt_type < 256)
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return(0);
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for (cnt = 0; cnt < rc; cnt += 2)
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{
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c = arg[cnt];
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arg[cnt] = arg[cnt+1];
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arg[cnt+1] = c;
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}
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return(0);
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}
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#endif /* RMTIOCTL */
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/*
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* Added routines to replace open(), close(), lseek(), ioctl(), etc.
|
|
* The preprocessor can be used to remap these the rmtopen(), etc
|
|
* thus minimizing source changes:
|
|
*
|
|
* #ifdef <something>
|
|
* # define access rmtaccess
|
|
* # define close rmtclose
|
|
* # define creat rmtcreat
|
|
* # define dup rmtdup
|
|
* # define fcntl rmtfcntl
|
|
* # define fstat rmtfstat
|
|
* # define ioctl rmtioctl
|
|
* # define isatty rmtisatty
|
|
* # define lseek rmtlseek
|
|
* # define lstat rmtlstat
|
|
* # define open rmtopen
|
|
* # define read rmtread
|
|
* # define stat rmtstat
|
|
* # define write rmtwrite
|
|
* #endif
|
|
*
|
|
* -- Fred Fish
|
|
*
|
|
* ADR --- I set up a <rmt.h> include file for this
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Note that local vs remote file descriptors are distinquished
|
|
* by adding a bias to the remote descriptors. This is a quick
|
|
* and dirty trick that may not be portable to some systems.
|
|
*/
|
|
|
|
#define REM_BIAS 128
|
|
|
|
|
|
/*
|
|
* Test pathname to see if it is local or remote. A remote device
|
|
* is any string that contains ":/dev/". Returns 1 if remote,
|
|
* 0 otherwise.
|
|
*/
|
|
|
|
static int
|
|
remdev(path)
|
|
const char *path;
|
|
{
|
|
if ((path = strchr (path, ':')) != NULL)
|
|
{
|
|
if (strncmp (path + 1, "/dev/", 5) == 0)
|
|
{
|
|
return (1);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Open a local or remote file. Looks just like open(2) to
|
|
* caller.
|
|
*/
|
|
|
|
int
|
|
rmtopen(path, oflag, mode)
|
|
const char *path;
|
|
int oflag;
|
|
mode_t mode;
|
|
{
|
|
int fd;
|
|
|
|
if (remdev (path))
|
|
{
|
|
fd = _rmt_open (path, oflag, mode);
|
|
|
|
return (fd == -1) ? -1 : (fd + REM_BIAS);
|
|
}
|
|
else
|
|
{
|
|
return (open (path, oflag, mode));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Test pathname for specified access. Looks just like access(2)
|
|
* to caller.
|
|
*/
|
|
|
|
int
|
|
rmtaccess(path, amode)
|
|
const char *path;
|
|
int amode;
|
|
{
|
|
if (remdev (path))
|
|
{
|
|
return (0); /* Let /etc/rmt find out */
|
|
}
|
|
else
|
|
{
|
|
return (access (path, amode));
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Isrmt. Let a programmer know he has a remote device.
|
|
*/
|
|
|
|
int
|
|
isrmt(fd)
|
|
int fd;
|
|
{
|
|
return (fd >= REM_BIAS);
|
|
}
|
|
|
|
|
|
/*
|
|
* Read from stream. Looks just like read(2) to caller.
|
|
*/
|
|
|
|
ssize_t
|
|
rmtread(fildes, buf, nbyte)
|
|
int fildes;
|
|
void *buf;
|
|
size_t nbyte;
|
|
{
|
|
if (isrmt (fildes))
|
|
{
|
|
return (_rmt_read (fildes - REM_BIAS, buf, nbyte));
|
|
}
|
|
else
|
|
{
|
|
return (read (fildes, buf, nbyte));
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Write to stream. Looks just like write(2) to caller.
|
|
*/
|
|
|
|
ssize_t
|
|
rmtwrite(fildes, buf, nbyte)
|
|
int fildes;
|
|
const void *buf;
|
|
size_t nbyte;
|
|
{
|
|
if (isrmt (fildes))
|
|
{
|
|
return (_rmt_write (fildes - REM_BIAS, buf, nbyte));
|
|
}
|
|
else
|
|
{
|
|
return (write (fildes, buf, nbyte));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Perform lseek on file. Looks just like lseek(2) to caller.
|
|
*/
|
|
|
|
off_t
|
|
rmtlseek(fildes, offset, whence)
|
|
int fildes;
|
|
off_t offset;
|
|
int whence;
|
|
{
|
|
if (isrmt (fildes))
|
|
{
|
|
return (_rmt_lseek (fildes - REM_BIAS, offset, whence));
|
|
}
|
|
else
|
|
{
|
|
return (lseek (fildes, offset, whence));
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Close a file. Looks just like close(2) to caller.
|
|
*/
|
|
|
|
int
|
|
rmtclose(fildes)
|
|
int fildes;
|
|
{
|
|
if (isrmt (fildes))
|
|
{
|
|
return (_rmt_close (fildes - REM_BIAS));
|
|
}
|
|
else
|
|
{
|
|
return (close (fildes));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Do ioctl on file. Looks just like ioctl(2) to caller.
|
|
*/
|
|
|
|
int
|
|
rmtioctl(fildes, request, arg)
|
|
int fildes;
|
|
unsigned long request;
|
|
char *arg;
|
|
{
|
|
if (isrmt (fildes))
|
|
{
|
|
#ifdef RMTIOCTL
|
|
return (_rmt_ioctl (fildes - REM_BIAS, request, arg));
|
|
#else
|
|
errno = EOPNOTSUPP;
|
|
return (-1); /* For now (fnf) */
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
return (ioctl (fildes, request, arg));
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Duplicate an open file descriptor. Looks just like dup(2)
|
|
* to caller.
|
|
*/
|
|
|
|
int
|
|
rmtdup(fildes)
|
|
int fildes;
|
|
{
|
|
if (isrmt (fildes))
|
|
{
|
|
errno = EOPNOTSUPP;
|
|
return (-1); /* For now (fnf) */
|
|
}
|
|
else
|
|
{
|
|
return (dup (fildes));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Get file status. Looks just like fstat(2) to caller.
|
|
*/
|
|
|
|
int
|
|
rmtfstat(fildes, buf)
|
|
int fildes;
|
|
struct stat *buf;
|
|
{
|
|
if (isrmt (fildes))
|
|
{
|
|
errno = EOPNOTSUPP;
|
|
return (-1); /* For now (fnf) */
|
|
}
|
|
else
|
|
{
|
|
return (fstat (fildes, buf));
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Get file status. Looks just like stat(2) to caller.
|
|
*/
|
|
|
|
int
|
|
rmtstat(path, buf)
|
|
const char *path;
|
|
struct stat *buf;
|
|
{
|
|
if (remdev (path))
|
|
{
|
|
errno = EOPNOTSUPP;
|
|
return (-1); /* For now (fnf) */
|
|
}
|
|
else
|
|
{
|
|
return (stat (path, buf));
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Create a file from scratch. Looks just like creat(2) to the caller.
|
|
*/
|
|
|
|
int
|
|
rmtcreat(path, mode)
|
|
const char *path;
|
|
mode_t mode;
|
|
{
|
|
if (remdev (path))
|
|
{
|
|
return (rmtopen (path, 1 | O_CREAT, mode));
|
|
}
|
|
else
|
|
{
|
|
return (creat (path, mode));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Rmtfcntl. Do a remote fcntl operation.
|
|
*/
|
|
|
|
int
|
|
rmtfcntl(fd, cmd, arg)
|
|
int fd, cmd, arg;
|
|
{
|
|
if (isrmt (fd))
|
|
{
|
|
errno = EOPNOTSUPP;
|
|
return (-1);
|
|
}
|
|
else
|
|
{
|
|
return (fcntl (fd, cmd, arg));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Rmtisatty. Do the isatty function.
|
|
*/
|
|
|
|
int
|
|
rmtisatty(fd)
|
|
int fd;
|
|
{
|
|
if (isrmt (fd))
|
|
return (0);
|
|
else
|
|
return (isatty (fd));
|
|
}
|
|
|
|
|
|
/*
|
|
* Get file status, even if symlink. Looks just like lstat(2) to caller.
|
|
*/
|
|
|
|
int
|
|
rmtlstat(path, buf)
|
|
const char *path;
|
|
struct stat *buf;
|
|
{
|
|
if (remdev (path))
|
|
{
|
|
errno = EOPNOTSUPP;
|
|
return (-1); /* For now (fnf) */
|
|
}
|
|
else
|
|
{
|
|
return (lstat (path, buf));
|
|
}
|
|
}
|