int
__rmt_open (const char *path, int oflag, int bias, const char *remote_shell)
{
int remote_pipe_number; /* pseudo, biased file descriptor */
char *path_copy; /* copy of path string */
char *cursor; /* cursor in path_copy */
char *remote_host; /* remote host name */
char *remote_file; /* remote file name (often a device) */
char *remote_user; /* remote user name */
char command_buffer[CMDBUFSIZE];
#ifndef HAVE_NETDB_H
const char *remote_shell_basename;
int status;
#endif
/* Find an unused pair of file descriptors. */
for (remote_pipe_number = 0;
remote_pipe_number < MAXUNIT;
remote_pipe_number++)
if (READ (remote_pipe_number) == -1
&& WRITE (remote_pipe_number) == -1)
break;
if (remote_pipe_number == MAXUNIT)
{
errno = EMFILE;
return -1;
}
/* Pull apart the system and device, and optional user. */
path_copy = xstrdup (path);
remote_host = path_copy;
remote_user = NULL;
remote_file = NULL;
for (cursor = path_copy; *cursor; cursor++)
switch (*cursor)
{
default:
break;
case '@':
if (!remote_user)
{
remote_user = remote_host;
*cursor = '\0';
remote_host = cursor + 1;
}
break;
case ':':
if (!remote_file)
{
*cursor = '\0';
remote_file = cursor + 1;
}
break;
}
/* FIXME: Should somewhat validate the decoding, here. */
if (*remote_user == '\0')
remote_user = NULL;
#ifdef HAVE_NETDB_H
/* Execute the remote command using rexec. */
READ (remote_pipe_number) = _rmt_rexec (remote_host, remote_user);
if (READ (remote_pipe_number) < 0)
{
free (path_copy);
return -1;
}
WRITE (remote_pipe_number) = READ (remote_pipe_number);
#else /* not HAVE_NETDB_H */
/* Identify the remote command to be executed. */
if (!remote_shell)
{
#ifdef REMOTE_SHELL
remote_shell = REMOTE_SHELL;
#else
errno = EIO;
free (path_copy);
return -1;
#endif
}
remote_shell_basename = strrchr (remote_shell, '/');
if (remote_shell_basename)
remote_shell_basename++;
else
remote_shell_basename = remote_shell;
/* Set up the pipes for the `rsh' command, and fork. */
if (pipe (to_remote[remote_pipe_number]) == -1
|| pipe (from_remote[remote_pipe_number]) == -1)
{
free (path_copy);
return -1;
}
status = fork ();
if (status == -1)
{
free (path_copy);
return -1;
}
if (status == 0)
{
/* Child. */
close (0);
dup (to_remote[remote_pipe_number][0]);
close (to_remote[remote_pipe_number][0]);
close (to_remote[remote_pipe_number][1]);
close (1);
dup (from_remote[remote_pipe_number][1]);
close (from_remote[remote_pipe_number][0]);
close (from_remote[remote_pipe_number][1]);
setuid (getuid ());
setgid (getgid ());
if (remote_user)
execl (remote_shell, remote_shell_basename, remote_host,
"-l", remote_user, "/etc/rmt", (char *) 0);
else
execl (remote_shell, remote_shell_basename, remote_host,
"/etc/rmt", (char *) 0);
/* Bad problems if we get here. */
/* In a previous version, _exit was used here instead of exit. */
error (EXIT_ON_EXEC_ERROR, errno, _("Cannot execute remote shell"));
}
/* Parent. */
close (from_remote[remote_pipe_number][1]);
close (to_remote[remote_pipe_number][0]);
#endif /* not HAVE_NETDB_H */
/* Attempt to open the tape device. */
sprintf (command_buffer, "O%s\n%d\n", remote_file, oflag);
if (do_command (remote_pipe_number, command_buffer) == -1
|| get_status (remote_pipe_number) == -1)
{
free (path_copy);
return -1;
}
free (path_copy);
return remote_pipe_number + bias;
}
/* Open a file (a magnetic tape device?) on the system specified in
FILE_NAME, as the given user. FILE_NAME has the form `[USER@]HOST:FILE'.
OPEN_MODE is O_RDONLY, O_WRONLY, etc. If successful, return the
remote pipe number plus BIAS. REMOTE_SHELL may be overridden. On
error, return -1. */
int
rmt_open__ (const char *file_name, int open_mode, int bias,
const char *remote_shell)
{
int remote_pipe_number; /* pseudo, biased file descriptor */
char *file_name_copy; /* copy of file_name string */
char *remote_host; /* remote host name */
char *remote_file; /* remote file name (often a device) */
char *remote_user; /* remote user name */
/* Find an unused pair of file descriptors. */
for (remote_pipe_number = 0;
remote_pipe_number < MAXUNIT;
remote_pipe_number++)
if (READ_SIDE (remote_pipe_number) == -1
&& WRITE_SIDE (remote_pipe_number) == -1)
break;
if (remote_pipe_number == MAXUNIT)
{
errno = EMFILE;
return -1;
}
/* Pull apart the system and device, and optional user. */
{
char *cursor;
file_name_copy = xstrdup (file_name);
remote_host = file_name_copy;
remote_user = 0;
remote_file = 0;
for (cursor = file_name_copy; *cursor; cursor++)
switch (*cursor)
{
default:
break;
case '\n':
/* Do not allow newlines in the file_name, since the protocol
uses newline delimiters. */
free (file_name_copy);
errno = ENOENT;
return -1;
case '@':
if (!remote_user)
{
remote_user = remote_host;
*cursor = '\0';
remote_host = cursor + 1;
}
break;
case ':':
if (!remote_file)
{
*cursor = '\0';
remote_file = cursor + 1;
}
break;
}
}
/* FIXME: Should somewhat validate the decoding, here. */
if (gethostbyname (remote_host) == NULL)
error (EXIT_ON_EXEC_ERROR, 0, _("Cannot connect to %s: resolve failed"),
remote_host);
if (remote_user && *remote_user == '\0')
remote_user = 0;
#if WITH_REXEC
/* Execute the remote command using rexec. */
READ_SIDE (remote_pipe_number) = _rmt_rexec (remote_host, remote_user);
if (READ_SIDE (remote_pipe_number) < 0)
{
int e = errno;
free (file_name_copy);
errno = e;
return -1;
}
WRITE_SIDE (remote_pipe_number) = READ_SIDE (remote_pipe_number);
#else /* not WITH_REXEC */
{
const char *remote_shell_basename;
pid_t status;
/* Identify the remote command to be executed. */
if (!remote_shell)
{
#ifdef REMOTE_SHELL
remote_shell = REMOTE_SHELL;
#else
free (file_name_copy);
errno = EIO;
return -1;
#endif
}
remote_shell_basename = last_component (remote_shell);
/* Set up the pipes for the `rsh' command, and fork. */
if (pipe (to_remote[remote_pipe_number]) == -1
|| pipe (from_remote[remote_pipe_number]) == -1)
{
int e = errno;
free (file_name_copy);
errno = e;
return -1;
}
status = fork ();
if (status == -1)
{
int e = errno;
free (file_name_copy);
errno = e;
return -1;
}
if (status == 0)
{
/* Child. */
if (dup2 (to_remote[remote_pipe_number][PREAD], STDIN_FILENO) < 0
|| (to_remote[remote_pipe_number][PREAD] != STDIN_FILENO
&& close (to_remote[remote_pipe_number][PREAD]) != 0)
|| (to_remote[remote_pipe_number][PWRITE] != STDIN_FILENO
&& close (to_remote[remote_pipe_number][PWRITE]) != 0)
|| dup2 (from_remote[remote_pipe_number][PWRITE], STDOUT_FILENO) < 0
|| close (from_remote[remote_pipe_number][PREAD]) != 0
|| close (from_remote[remote_pipe_number][PWRITE]) != 0)
error (EXIT_ON_EXEC_ERROR, errno,
_("Cannot redirect files for remote shell"));
sys_reset_uid_gid ();
if (remote_user)
execl (remote_shell, remote_shell_basename, remote_host,
"-l", remote_user, rmt_command, (char *) 0);
else
execl (remote_shell, remote_shell_basename, remote_host,
rmt_command, (char *) 0);
/* Bad problems if we get here. */
/* In a previous version, _exit was used here instead of exit. */
error (EXIT_ON_EXEC_ERROR, errno, _("Cannot execute remote shell"));
}
/* Parent. */
close (from_remote[remote_pipe_number][PWRITE]);
close (to_remote[remote_pipe_number][PREAD]);
}
#endif /* not WITH_REXEC */
/* Attempt to open the tape device. */
{
size_t remote_file_len = strlen (remote_file);
char *command_buffer = xmalloc (remote_file_len + 1000);
sprintf (command_buffer, "O%s\n", remote_file);
encode_oflag (command_buffer + remote_file_len + 2, open_mode);
strcat (command_buffer, "\n");
if (do_command (remote_pipe_number, command_buffer) == -1
|| get_status (remote_pipe_number) == -1)
{
int e = errno;
free (command_buffer);
free (file_name_copy);
_rmt_shutdown (remote_pipe_number, e);
return -1;
}
free (command_buffer);
}
free (file_name_copy);
return remote_pipe_number + bias;
}
static int
/*ARGSUSED*/
_rmt_open(const char *path, int oflag, int mode)
{
int i;
char buffer[BUFMAGIC];
char host[MAXHOSTLEN];
char device[BUFMAGIC];
char login[BUFMAGIC];
char *sys, *dev, *user;
const char *rshpath, *rsh;
_DIAGASSERT(path != NULL);
sys = host;
dev = device;
user = login;
/*
* first, find an open pair of file descriptors
*/
for (i = 0; i < MAXUNIT; i++)
if (READ(i) == -1 && WRITE(i) == -1)
break;
if (i == MAXUNIT) {
errno = EMFILE;
return -1;
}
/*
* pull apart system and device, and optional user
* don't munge original string
* if COMPAT is defined, also handle old (4.2) style person.site notation.
*/
while (*path != '@'
#ifdef COMPAT
&& *path != '.'
#endif
&& *path != ':') {
*sys++ = *path++;
}
*sys = '\0';
path++;
if (*(path - 1) == '@') {
(void)strncpy(user, host, sizeof(login) - 1);
/* saw user part of user@host */
sys = host; /* start over */
while (*path != ':') {
*sys++ = *path++;
}
*sys = '\0';
path++;
}
#ifdef COMPAT
else if (*(path - 1) == '.') {
while (*path != ':') {
*user++ = *path++;
}
*user = '******';
path++;
}
#endif
else
*user = '******';
while (*path) {
*dev++ = *path++;
}
*dev = '\0';
#ifdef USE_REXEC
/*
* Execute the remote command using rexec
*/
READ(i) = WRITE(i) = _rmt_rexec(host, login);
if (READ(i) < 0)
return -1;
#else
/*
* setup the pipes for the 'rsh' command and fork
*/
if (pipe(Ptc[i]) == -1 || pipe(Ctp[i]) == -1)
return -1;
switch (fork()) {
case -1:
return -1;
case 0:
close(0);
dup(Ptc[i][0]);
close(Ptc[i][0]); close(Ptc[i][1]);
close(1);
dup(Ctp[i][1]);
close(Ctp[i][0]); close(Ctp[i][1]);
(void) setuid(getuid());
(void) setgid(getgid());
if ((rshpath = getenv("RCMD_CMD")) == NULL)
rshpath = _PATH_RSH;
if ((rsh = strrchr(rshpath, '/')) == NULL)
rsh = rshpath;
else
rsh++;
if (*login) {
execl(rshpath, rsh, host, "-l", login, _PATH_RMT, NULL);
} else {
execl(rshpath, rsh, host, _PATH_RMT, NULL);
}
/*
* bad problems if we get here
*/
err(1, "Cannnot exec %s", rshpath);
/*FALLTHROUGH*/
default:
break;
}
close(Ptc[i][0]); close(Ctp[i][1]);
#endif
/*
* now attempt to open the tape device
*/
(void)snprintf(buffer, sizeof(buffer), "O%s\n%d\n", device, oflag);
if (command(i, buffer) == -1 || status(i) == -1)
return -1;
return i;
}
