Fix warnings about: . Unused variables . format mismatch in printf/scanf format string and arguments . Missing parenthesis around assignment as truth values . Clang warnings anout unknown GCC pragma
897 lines
16 KiB
C
897 lines
16 KiB
C
/* $NetBSD: rmtlib.c,v 1.26 2012/03/21 10:10:37 matt 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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#include <sys/cdefs.h>
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__RCSID("$NetBSD: rmtlib.c,v 1.26 2012/03/21 10:10:37 matt Exp $");
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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 <sys/types.h>
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#include <sys/stat.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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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdarg.h>
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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 <unistd.h>
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#include <err.h>
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#ifdef USE_REXEC
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#include <netdb.h>
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#endif
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#define __RMTLIB_PRIVATE
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#include <rmt.h> /* get prototypes for remapped functions */
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#include "pathnames.h"
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static int _rmt_close(int);
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static int _rmt_ioctl(int, unsigned long, void *);
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static off_t _rmt_lseek(int, off_t, int);
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static int _rmt_open(const char *, int, int);
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static ssize_t _rmt_read(int, void *, size_t);
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static ssize_t _rmt_write(int, const void *, size_t);
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static int command(int, const char *);
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static int remdev(const char *);
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static void rmtabort(int);
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static int status(int);
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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(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(int fildes, const char *buf)
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{
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size_t blen;
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sig_t pstat;
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_DIAGASSERT(buf != NULL);
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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 ((size_t)write(WRITE(fildes), buf, blen) == blen) {
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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(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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if (read(READ(fildes), cp, 1) != 1) {
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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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*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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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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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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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(const char *, const char *);
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static int
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_rmt_rexec(const char *host, const char *user)
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{
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struct servent *rexecserv;
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_DIAGASSERT(host != NULL);
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/* user may be NULL */
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rexecserv = getservbyname("exec", "tcp");
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if (rexecserv == NULL)
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errx(1, "exec/tcp: service not available.");
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if ((user != NULL) && *user == '\0')
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user = NULL;
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return rexec(&host, rexecserv->s_port, user, NULL,
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"/etc/rmt", 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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/*ARGSUSED*/
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_rmt_open(const char *path, int oflag, int mode)
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{
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int i;
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char buffer[BUFMAGIC];
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char host[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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const char *rshpath, *rsh;
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_DIAGASSERT(path != NULL);
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sys = host;
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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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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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(void)strncpy(user, host, sizeof(login) - 1);
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/* saw user part of user@host */
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sys = host; /* 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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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(host, 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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switch (fork()) {
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case -1:
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return -1;
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case 0:
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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 ((rshpath = getenv("RCMD_CMD")) == NULL)
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rshpath = _PATH_RSH;
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if ((rsh = strrchr(rshpath, '/')) == NULL)
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rsh = rshpath;
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else
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rsh++;
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if (*login) {
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execl(rshpath, rsh, host, "-l", login, _PATH_RMT, NULL);
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} else {
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execl(rshpath, rsh, host, _PATH_RMT, NULL);
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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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err(1, "Cannnot exec %s", rshpath);
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/*FALLTHROUGH*/
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default:
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break;
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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(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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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 ssize_t
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_rmt_read(int fildes, void *buf, size_t nbyte)
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{
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size_t rc;
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int rv;
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ssize_t nread;
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char *p;
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char buffer[BUFMAGIC];
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_DIAGASSERT(buf != NULL);
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(void)snprintf(buffer, sizeof buffer, "R%zu\n", nbyte);
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if (command(fildes, buffer) == -1 || (rv = status(fildes)) == -1)
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return -1;
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if (rv > (int)nbyte)
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rv = (int)nbyte;
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for (rc = rv, p = buf; rc > 0; rc -= nread, p += nread) {
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if ((nread = read(READ(fildes), p, rc)) <= 0) {
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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 rv;
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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 ssize_t
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_rmt_write(int fildes, const void *buf, size_t nbyte)
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{
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char buffer[BUFMAGIC];
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sig_t pstat;
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_DIAGASSERT(buf != NULL);
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(void)snprintf(buffer, sizeof buffer, "W%zu\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 ((size_t)write(WRITE(fildes), buf, nbyte) == nbyte) {
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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(int fildes, off_t offset, int whence)
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{
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char buffer[BUFMAGIC];
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/*LONGLONG*/
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(void)snprintf(buffer, sizeof buffer, "L%lld\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(int fildes, unsigned long op, void *arg)
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{
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char c;
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int rv;
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size_t rc;
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ssize_t cnt;
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char buffer[BUFMAGIC], *p;
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struct mtop *mtop = arg;
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_DIAGASSERT(arg != NULL);
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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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(void)snprintf(buffer, sizeof buffer, "I%d\n%d\n",
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mtop->mt_op, mtop->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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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 || (rv = status(fildes)) == -1)
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return -1;
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memset(arg, 0, sizeof(struct mtget));
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for (rc = rv, p = arg; rc > 0; rc -= cnt, p += cnt) {
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if ((cnt = read(READ(fildes), p, rc)) <= 0) {
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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 *)(void *)p)->mt_type < 256)
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return 0;
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for (cnt = 0; cnt < rv; cnt += 2) {
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c = p[cnt];
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p[cnt] = p[cnt + 1];
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p[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.
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* The preprocessor can be used to remap these the rmtopen(), etc
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* thus minimizing source changes:
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*
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* #ifdef <something>
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* # define access rmtaccess
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* # define close rmtclose
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* # define creat rmtcreat
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* # define dup rmtdup
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* # define fcntl rmtfcntl
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* # define fstat rmtfstat
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* # define ioctl rmtioctl
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* # define isatty rmtisatty
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* # define lseek rmtlseek
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* # 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(const char *path)
|
|
{
|
|
|
|
_DIAGASSERT(path != NULL);
|
|
|
|
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(const char *path, int oflag, ...)
|
|
{
|
|
/* LSC: MINIX This works only for int mode flags, so use the expected type. */
|
|
uint32_t mode;
|
|
int fd;
|
|
va_list ap;
|
|
va_start(ap, oflag);
|
|
|
|
mode = va_arg(ap, uint32_t);
|
|
va_end(ap);
|
|
|
|
_DIAGASSERT(path != NULL);
|
|
|
|
if (remdev(path)) {
|
|
fd = _rmt_open(path, oflag, (int)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(const char *path, int amode)
|
|
{
|
|
|
|
_DIAGASSERT(path != NULL);
|
|
|
|
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(int fd)
|
|
{
|
|
int unbias = fd - REM_BIAS;
|
|
|
|
return (fd >= REM_BIAS) && unbias < MAXUNIT &&
|
|
(WRITE(unbias) != -1 || READ(unbias) != -1);
|
|
}
|
|
|
|
|
|
/*
|
|
* Read from stream. Looks just like read(2) to caller.
|
|
*/
|
|
ssize_t
|
|
rmtread(int fildes, void *buf, size_t nbyte)
|
|
{
|
|
|
|
_DIAGASSERT(buf != NULL);
|
|
|
|
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(int fildes, const void *buf, size_t nbyte)
|
|
{
|
|
|
|
_DIAGASSERT(buf != NULL);
|
|
|
|
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(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(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(int fildes, unsigned long request, ...)
|
|
{
|
|
void *arg;
|
|
va_list ap;
|
|
va_start(ap, request);
|
|
|
|
arg = va_arg(ap, void *);
|
|
va_end(ap);
|
|
|
|
/* XXX: arg may be NULL ? */
|
|
|
|
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(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(int fildes, struct stat *buf)
|
|
{
|
|
|
|
_DIAGASSERT(buf != NULL);
|
|
|
|
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(const char *path, struct stat *buf)
|
|
{
|
|
|
|
_DIAGASSERT(path != NULL);
|
|
_DIAGASSERT(buf != NULL);
|
|
|
|
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(const char *path, mode_t mode)
|
|
{
|
|
|
|
_DIAGASSERT(path != NULL);
|
|
|
|
if (remdev(path)) {
|
|
return rmtopen(path, O_WRONLY | O_CREAT, mode);
|
|
} else {
|
|
return open(path, O_CREAT | O_TRUNC | O_WRONLY, mode);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Rmtfcntl. Do a remote fcntl operation.
|
|
*/
|
|
int
|
|
rmtfcntl(int fd, int cmd, ...)
|
|
{
|
|
void *arg;
|
|
va_list ap;
|
|
va_start(ap, cmd);
|
|
|
|
arg = va_arg(ap, void *);
|
|
va_end(ap);
|
|
|
|
/* XXX: arg may be NULL ? */
|
|
|
|
if (isrmt(fd)) {
|
|
errno = EOPNOTSUPP;
|
|
return -1;
|
|
} else {
|
|
return fcntl(fd, cmd, arg);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Rmtisatty. Do the isatty function.
|
|
*/
|
|
int
|
|
rmtisatty(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(const char *path, struct stat *buf)
|
|
{
|
|
|
|
_DIAGASSERT(path != NULL);
|
|
_DIAGASSERT(buf != NULL);
|
|
|
|
if (remdev(path)) {
|
|
errno = EOPNOTSUPP;
|
|
return -1; /* For now (fnf) */
|
|
} else {
|
|
return lstat(path, buf);
|
|
}
|
|
}
|