From 754e65fc14e65028bc2aa035c8fff283aa708b85 Mon Sep 17 00:00:00 2001 From: Sergey Poznyakoff Date: Mon, 6 Sep 2004 13:49:42 +0000 Subject: Initial revision --- rmt/rmt.c | 577 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 577 insertions(+) create mode 100644 rmt/rmt.c (limited to 'rmt/rmt.c') diff --git a/rmt/rmt.c b/rmt/rmt.c new file mode 100644 index 0000000..9ac327f --- /dev/null +++ b/rmt/rmt.c @@ -0,0 +1,577 @@ +/* Remote connection server. + + Copyright (C) 1994, 1995, 1996, 1997, 1999, 2000, 2001, 2003, 2004 + 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 Temple 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 + MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ + +#include "system.h" +#include +#include +#include + +#include +#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; +static size_t allocated_size; + +/* Buffer for constructing the reply. */ +static char reply_buffer[BUFSIZ]; + +/* Debugging tools. */ + +static FILE *debug_file; + +#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 char *sys_errlist[]; + extern int sys_nerr; + + if (errnum > 0 && errnum <= sys_nerr) + return _(sys_errlist[errnum]); + return _("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); + full_write (STDOUT_FILENO, 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)); + full_write (STDOUT_FILENO, reply_buffer, strlen (reply_buffer)); +} + +static void +get_string (char *string) +{ + int counter; + + for (counter = 0; ; counter++) + { + if (safe_read (STDIN_FILENO, string + counter, 1) != 1) + exit (EXIT_SUCCESS); + + if (string[counter] == '\n' || counter == STRING_SIZE - 1) + break; + } + string[counter] = '\0'; +} + +static void +prepare_input_buffer (int fd, size_t size) +{ + if (size <= allocated_size) + return; + + if (record_buffer) + free (record_buffer); + + record_buffer = malloc (size); + + if (! record_buffer) + { + 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 + if (0 <= fd) + { + int isize = size < INT_MAX ? size : INT_MAX; + while (setsockopt (fd, SOL_SOCKET, SO_RCVBUF, + (char *) &isize, sizeof isize) + && 1024 < isize) + isize >>= 1; + } +#endif +} + +/* Decode OFLAG_STRING, which represents the 2nd argument to `open'. + OFLAG_STRING should contain an optional integer, followed by an optional + symbolic representation of an open flag using only '|' to separate its + components (e.g. "O_WRONLY|O_CREAT|O_TRUNC"). Prefer the symbolic + representation if available, falling back on the numeric + representation, or to zero if both formats are absent. + + This function should be the inverse of encode_oflag. The numeric + representation is not portable from one host to another, but it is + for backward compatibility with old-fashioned clients that do not + emit symbolic open flags. */ + +static int +decode_oflag (char const *oflag_string) +{ + char *oflag_num_end; + int numeric_oflag = strtol (oflag_string, &oflag_num_end, 10); + int symbolic_oflag = 0; + + oflag_string = oflag_num_end; + while (ISSPACE ((unsigned char) *oflag_string)) + oflag_string++; + + do + { + struct name_value_pair { char const *name; int value; }; + static struct name_value_pair const table[] = + { +#ifdef O_APPEND + {"APPEND", O_APPEND}, +#endif + {"CREAT", O_CREAT}, +#ifdef O_DSYNC + {"DSYNC", O_DSYNC}, +#endif + {"EXCL", O_EXCL}, +#ifdef O_LARGEFILE + {"LARGEFILE", O_LARGEFILE}, /* LFS extension for opening large files */ +#endif +#ifdef O_NOCTTY + {"NOCTTY", O_NOCTTY}, +#endif +#ifdef O_NONBLOCK + {"NONBLOCK", O_NONBLOCK}, +#endif + {"RDONLY", O_RDONLY}, + {"RDWR", O_RDWR}, +#ifdef O_RSYNC + {"RSYNC", O_RSYNC}, +#endif +#ifdef O_SYNC + {"SYNC", O_SYNC}, +#endif + {"TRUNC", O_TRUNC}, + {"WRONLY", O_WRONLY} + }; + struct name_value_pair const *t; + size_t s; + + if (*oflag_string++ != 'O' || *oflag_string++ != '_') + return numeric_oflag; + + for (t = table; + (strncmp (oflag_string, t->name, s = strlen (t->name)) != 0 + || (oflag_string[s] + && strchr ("ABCDEFGHIJKLMNOPQRSTUVWXYZ_0123456789", + oflag_string[s]))); + t++) + if (t == table + sizeof table / sizeof *table - 1) + return numeric_oflag; + + symbolic_oflag |= t->value; + oflag_string += s; + } + while (*oflag_string++ == '|'); + + return symbolic_oflag; +} + +static struct option const long_opts[] = +{ + {"help", no_argument, 0, 'h'}, + {"version", no_argument, 0, 'v'}, + {0, 0, 0, 0} +}; + +static void usage (int) __attribute__ ((noreturn)); + +static void +usage (int status) +{ + if (status != EXIT_SUCCESS) + fprintf (stderr, _("Try `%s --help' for more information.\n"), + program_name); + else + { + printf (_("\ +Usage: %s [OPTION]\n\ +Manipulate a tape drive, accepting commands from a remote process.\n\ +\n\ + --version Output version info.\n\ + --help Output this help.\n"), + program_name); + printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT); + } + + exit (status); +} + +int +main (int argc, char *const *argv) +{ + char command; + size_t status; + + /* FIXME: Localization is meaningless, unless --help and --version are + locally used. Localization 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); + + switch (getopt_long (argc, argv, "", long_opts, NULL)) + { + default: + usage (EXIT_FAILURE); + + case 'h': + usage (EXIT_SUCCESS); + + case 'v': + { + printf ("rmt (%s) %s\n%s\n", PACKAGE_NAME, PACKAGE_VERSION, + "Copyright (C) 2004 Free Software Foundation, Inc."); + puts (_("\ +This program comes with NO WARRANTY, to the extent permitted by law.\n\ +You may redistribute it under the terms of the GNU General Public License;\n\ +see the file named COPYING for details.")); + } + return EXIT_SUCCESS; + + case -1: + break; + } + + if (optind < argc) + { + if (optind != argc - 1) + usage (EXIT_FAILURE); + debug_file = fopen (argv[optind], "w"); + if (debug_file == 0) + { + report_numbered_error (errno); + return EXIT_FAILURE; + } + setbuf (debug_file, 0); + } + +top: + errno = 0; + status = 0; + if (safe_read (STDIN_FILENO, &command, 1) != 1) + return EXIT_SUCCESS; + + switch (command) + { + /* FIXME: Maybe 'H' and 'V' for --help and --version output? */ + + case 'O': + { + char device_string[STRING_SIZE]; + char oflag_string[STRING_SIZE]; + + get_string (device_string); + get_string (oflag_string); + DEBUG2 ("rmtd: O %s %s\n", device_string, oflag_string); + + if (tape >= 0) + close (tape); + + tape = open (device_string, decode_oflag (oflag_string), MODE_RW); + 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]; + off_t count = 0; + int negative; + int whence; + char *p; + + get_string (count_string); + get_string (position_string); + DEBUG2 ("rmtd: L %s %s\n", count_string, position_string); + + /* Parse count_string, taking care to check for overflow. + We can't use standard functions, + since off_t might be longer than long. */ + + for (p = count_string; *p == ' ' || *p == '\t'; p++) + continue; + + negative = *p == '-'; + p += negative || *p == '+'; + + for (;;) + { + int digit = *p++ - '0'; + if (9 < (unsigned) digit) + break; + else + { + off_t c10 = 10 * count; + off_t nc = negative ? c10 - digit : c10 + digit; + if (c10 / 10 != count || (negative ? c10 < nc : nc < c10)) + { + report_error_message (N_("Seek offset out of range")); + return EXIT_FAILURE; + } + count = nc; + } + } + + switch (atoi (position_string)) + { + case 0: whence = SEEK_SET; break; + case 1: whence = SEEK_CUR; break; + case 2: whence = SEEK_END; break; + default: + report_error_message (N_("Seek direction out of range")); + return EXIT_FAILURE; + } + count = lseek (tape, count, whence); + if (count < 0) + goto ioerror; + + /* Convert count back to string for reply. + We can't use sprintf, since off_t might be longer than long. */ + p = count_string + sizeof count_string; + *--p = '\0'; + do + *--p = '0' + (int) (count % 10); + while ((count /= 10) != 0); + + DEBUG1 ("rmtd: A %s\n", p); + + sprintf (reply_buffer, "A%s\n", p); + full_write (STDOUT_FILENO, reply_buffer, strlen (reply_buffer)); + goto top; + } + + case 'W': + { + char count_string[STRING_SIZE]; + size_t size; + size_t counter; + + get_string (count_string); + size = atol (count_string); + DEBUG1 ("rmtd: W %s\n", count_string); + + prepare_input_buffer (STDIN_FILENO, size); + for (counter = 0; counter < size; counter += status) + { + status = safe_read (STDIN_FILENO, &record_buffer[counter], + size - counter); + if (status == SAFE_READ_ERROR || status == 0) + { + DEBUG (_("rmtd: Premature eof\n")); + + report_error_message (N_("Premature end of file")); + return EXIT_FAILURE; /* exit status used to be 2 */ + } + } + status = full_write (tape, record_buffer, size); + if (status != size) + goto ioerror; + goto respond; + } + + case 'R': + { + char count_string[STRING_SIZE]; + size_t size; + + get_string (count_string); + DEBUG1 ("rmtd: R %s\n", count_string); + + size = atol (count_string); + prepare_input_buffer (-1, size); + status = safe_read (tape, record_buffer, size); + if (status == SAFE_READ_ERROR) + goto ioerror; + sprintf (reply_buffer, "A%lu\n", (unsigned long int) status); + full_write (STDOUT_FILENO, reply_buffer, strlen (reply_buffer)); + full_write (STDOUT_FILENO, 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; + const char *p; + off_t count = 0; + int negative; + + /* Parse count_string, taking care to check for overflow. + We can't use standard functions, + since off_t might be longer than long. */ + + for (p = count_string; *p == ' ' || *p == '\t'; p++) + continue; + + negative = *p == '-'; + p += negative || *p == '+'; + + for (;;) + { + int digit = *p++ - '0'; + if (9 < (unsigned) digit) + break; + else + { + off_t c10 = 10 * count; + off_t nc = negative ? c10 - digit : c10 + digit; + if (c10 / 10 != count || (negative ? c10 < nc : nc < c10)) + { + report_error_message (N_("Seek offset out of range")); + return EXIT_FAILURE; + } + count = nc; + } + } + + mtop.mt_count = count; + if (mtop.mt_count != count) + { + report_error_message (N_("Seek offset out of range")); + return EXIT_FAILURE; + } + mtop.mt_op = atoi (operation_string); + + if (ioctl (tape, MTIOCTOP, (char *) &mtop) < 0) + goto ioerror; + } +#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%ld\n", (long) status); + full_write (STDOUT_FILENO, reply_buffer, strlen (reply_buffer)); + full_write (STDOUT_FILENO, (char *) &operation, sizeof operation); + } +#endif + goto top; + } + + default: + DEBUG1 (_("rmtd: Garbage command %c\n"), command); + + report_error_message (N_("Garbage command")); + return EXIT_FAILURE; /* exit status used to be 3 */ + } + +respond: + DEBUG1 ("rmtd: A %ld\n", (long) status); + + sprintf (reply_buffer, "A%ld\n", (long) status); + full_write (STDOUT_FILENO, reply_buffer, strlen (reply_buffer)); + goto top; + +ioerror: + report_numbered_error (errno); + goto top; +} -- cgit v1.2.1