/* Remote connection server. Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Place - Suite 330, Boston, MA 02111-1307, USA. */ /* Copyright (C) 1983 Regents of the University of California. All rights reserved. Redistribution and use in source and binary forms are permitted provided that the above copyright notice and this paragraph are duplicated in all such forms and that any documentation, advertising materials, and other materials related to such distribution and use acknowledge that the software was developed by the University of California, Berkeley. The name of the University may not be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #include "system.h" #include #ifndef EXIT_FAILURE # define EXIT_FAILURE 1 #endif #ifndef EXIT_SUCCESS # define EXIT_SUCCESS 0 #endif /* Maximum size of a string from the requesting program. */ #define STRING_SIZE 64 /* Name of executing program. */ const char *program_name; /* File descriptor of the tape device, or negative if none open. */ static int tape = -1; /* Buffer containing transferred data, and its allocated size. */ static char *record_buffer = NULL; static int allocated_size = -1; /* Buffer for constructing the reply. */ static char reply_buffer[BUFSIZ]; /* Debugging tools. */ static FILE *debug_file = NULL; #define DEBUG(File) \ if (debug_file) fprintf(debug_file, File) #define DEBUG1(File, Arg) \ if (debug_file) fprintf(debug_file, File, Arg) #define DEBUG2(File, Arg1, Arg2) \ if (debug_file) fprintf(debug_file, File, Arg1, Arg2) /*------------------------------------------------. | Return an error string, given an error number. | `------------------------------------------------*/ #if HAVE_STRERROR # ifndef strerror char *strerror (); # endif #else static char * private_strerror (int errnum) { extern const char *const sys_errlist[]; extern int sys_nerr; if (errnum > 0 && errnum <= sys_nerr) return sys_errlist[errnum]; return N_("Unknown system error"); } # define strerror private_strerror #endif /*---. | ? | `---*/ static void report_error_message (const char *string) { DEBUG1 ("rmtd: E 0 (%s)\n", string); sprintf (reply_buffer, "E0\n%s\n", string); write (1, reply_buffer, strlen (reply_buffer)); } /*---. | ? | `---*/ static void report_numbered_error (int num) { DEBUG2 ("rmtd: E %d (%s)\n", num, strerror (num)); sprintf (reply_buffer, "E%d\n%s\n", num, strerror (num)); write (1, reply_buffer, strlen (reply_buffer)); } /*---. | ? | `---*/ static void get_string (char *string) { int counter; for (counter = 0; counter < STRING_SIZE; counter++) { if (read (0, string + counter, 1) != 1) exit (EXIT_SUCCESS); if (string[counter] == '\n') break; } string[counter] = '\0'; } /*---. | ? | `---*/ static void prepare_record_buffer (int size) { if (size <= allocated_size) return; if (record_buffer) free (record_buffer); record_buffer = malloc ((size_t) size); if (record_buffer == NULL) { DEBUG (_("rmtd: Cannot allocate buffer space\n")); report_error_message (N_("Cannot allocate buffer space")); exit (EXIT_FAILURE); /* exit status used to be 4 */ } allocated_size = size; #ifdef SO_RCVBUF while (size > 1024 && setsockopt (0, SOL_SOCKET, SO_RCVBUF, (char *) &size, sizeof (size)) < 0) size -= 1024; #else /* FIXME: I do not see any purpose to the following line... Sigh! */ size = 1 + ((size - 1) % 1024); #endif } /*---. | ? | `---*/ int main (int argc, char *const *argv) { char command; int status; /* FIXME: Localisation is meaningless, unless --help and --version are locally used. Localisation would be best accomplished by the calling tar, on messages found within error packets. */ program_name = argv[0]; setlocale (LC_ALL, ""); bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); /* FIXME: Implement --help and --version as for any other GNU program. */ argc--, argv++; if (argc > 0) { debug_file = fopen (*argv, "w"); if (debug_file == 0) { report_numbered_error (errno); exit (EXIT_FAILURE); } setbuf (debug_file, NULL); } top: errno = 0; /* FIXME: errno should be read-only */ status = 0; if (read (0, &command, 1) != 1) exit (EXIT_SUCCESS); switch (command) { /* FIXME: Maybe 'H' and 'V' for --help and --version output? */ case 'O': { char device_string[STRING_SIZE]; char mode_string[STRING_SIZE]; get_string (device_string); get_string (mode_string); DEBUG2 ("rmtd: O %s %s\n", device_string, mode_string); if (tape >= 0) close (tape); #if defined (i386) && defined (AIX) /* This is alleged to fix a byte ordering problem. I'm quite suspicious if it's right. -- mib. */ { int old_mode = atoi (mode_string); int new_mode = 0; if ((old_mode & 3) == 0) new_mode |= O_RDONLY; if (old_mode & 1) new_mode |= O_WRONLY; if (old_mode & 2) new_mode |= O_RDWR; if (old_mode & 0x0008) new_mode |= O_APPEND; if (old_mode & 0x0200) new_mode |= O_CREAT; if (old_mode & 0x0400) new_mode |= O_TRUNC; if (old_mode & 0x0800) new_mode |= O_EXCL; tape = open (device_string, new_mode, 0666); } #else tape = open (device_string, atoi (mode_string), 0666); #endif if (tape < 0) goto ioerror; goto respond; } case 'C': { char device_string[STRING_SIZE]; get_string (device_string); /* discard */ DEBUG ("rmtd: C\n"); if (close (tape) < 0) goto ioerror; tape = -1; goto respond; } case 'L': { char count_string[STRING_SIZE]; char position_string[STRING_SIZE]; get_string (count_string); get_string (position_string); DEBUG2 ("rmtd: L %s %s\n", count_string, position_string); status = lseek (tape, (off_t) atol (count_string), atoi (position_string)); if (status < 0) goto ioerror; goto respond; } case 'W': { char count_string[STRING_SIZE]; int size; int counter; get_string (count_string); size = atoi (count_string); DEBUG1 ("rmtd: W %s\n", count_string); prepare_record_buffer (size); for (counter = 0; counter < size; counter += status) { status = read (0, &record_buffer[counter], size - counter); if (status <= 0) { DEBUG (_("rmtd: Premature eof\n")); report_error_message (N_("Premature end of file")); exit (EXIT_FAILURE); /* exit status used to be 2 */ } } status = write (tape, record_buffer, size); if (status < 0) goto ioerror; goto respond; } case 'R': { char count_string[STRING_SIZE]; int size; get_string (count_string); DEBUG1 ("rmtd: R %s\n", count_string); size = atoi (count_string); prepare_record_buffer (size); status = read (tape, record_buffer, size); if (status < 0) goto ioerror; sprintf (reply_buffer, "A%d\n", status); write (1, reply_buffer, strlen (reply_buffer)); write (1, record_buffer, status); goto top; } case 'I': { char operation_string[STRING_SIZE]; char count_string[STRING_SIZE]; get_string (operation_string); get_string (count_string); DEBUG2 ("rmtd: I %s %s\n", operation_string, count_string); #ifdef MTIOCTOP { struct mtop mtop; mtop.mt_op = atoi (operation_string); mtop.mt_count = atoi (count_string); if (ioctl (tape, MTIOCTOP, (char *) &mtop) < 0) goto ioerror; status = mtop.mt_count; } #endif goto respond; } case 'S': /* status */ { DEBUG ("rmtd: S\n"); #ifdef MTIOCGET { struct mtget operation; if (ioctl (tape, MTIOCGET, (char *) &operation) < 0) goto ioerror; status = sizeof (operation); sprintf (reply_buffer, "A%d\n", status); write (1, reply_buffer, strlen (reply_buffer)); write (1, (char *) &operation, sizeof (operation)); } #endif goto top; } default: DEBUG1 (_("rmtd: Garbage command %c\n"), command); report_error_message (N_("Garbage command")); exit (EXIT_FAILURE); /* exit status used to be 3 */ } respond: DEBUG1 ("rmtd: A %d\n", status); sprintf (reply_buffer, "A%d\n", status); write (1, reply_buffer, strlen (reply_buffer)); goto top; ioerror: report_numbered_error (errno); goto top; }