common/dumprmt.c

   1 /*
   2  *      Ported to Linux's Second Extended File System as part of the
   3  *      dump and restore backup suit
   4  *      Remy Card <card@Linux.EU.Org>, 1994, 1995, 1996
   5  *
   6  */
   7
   8 /*-
   9  * Copyright (c) 1980, 1993
  10  *      The Regents of the University of California.  All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by the University of
  23  *      California, Berkeley and its contributors.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40
  41 #ifndef lint
  42 static char sccsid[] = "@(#)dumprmt.c   8.2 (Berkeley) 4/28/95";
  43 #endif /* not lint */
  44
  45 #include <sys/param.h>
  46 #include <sys/mtio.h>
  47 #include <sys/ioctl.h>
  48 #include <sys/socket.h>
  49 #include <sys/time.h>
  50 #ifdef __linux__
  51 #include <linux/ext2_fs.h>
  52 #include <bsdcompat.h>
  53 #else
  54 #ifdef sunos
  55 #include <sys/vnode.h>
  56
  57 #include <ufs/inode.h>
  58 #else
  59 #include <ufs/ufs/dinode.h>
  60 #endif
  61 #endif
  62
  63 #include <netinet/in.h>
  64 #include <netinet/tcp.h>
  65
  66 #include <protocols/dumprestore.h>
  67
  68 #include <ctype.h>
  69 #include <err.h>
  70 #include <netdb.h>
  71 #include <pwd.h>
  72 #include <signal.h>
  73 #include <stdio.h>
  74 #ifdef __STDC__
  75 #include <stdlib.h>
  76 #include <string.h>
  77 #include <unistd.h>
  78 #endif
  79
  80 #ifdef  __linux__
  81 #include <ext2fs/ext2fs.h>
  82 #endif
  83
  84 #include "pathnames.h"
  85 #include "dump.h"
  86
  87 #define TS_CLOSED       0
  88 #define TS_OPEN         1
  89
  90 static  int rmtstate = TS_CLOSED;
  91 static  int rmtape;
  92 static  char *rmtpeer;
  93
  94 static  int okname __P((char *));
  95 static  int rmtcall __P((char *, char *));
  96 static  void rmtconnaborted __P((/* int, int */));
  97 static  int rmtgetb __P((void));
  98 static  void rmtgetconn __P((void));
  99 static  void rmtgets __P((char *, int));
 100 static  int rmtreply __P((char *));
 101
 102 extern  int ntrec;              /* blocking factor on tape */
 103
 104 int
 105 rmthost(host)
 106         char *host;
 107 {
 108
 109         rmtpeer = malloc(strlen(host) + 1);
 110         if (rmtpeer)
 111                 strcpy(rmtpeer, host);
 112         else
 113                 rmtpeer = host;
 114         signal(SIGPIPE, rmtconnaborted);
 115         rmtgetconn();
 116         if (rmtape < 0)
 117                 return (0);
 118         return (1);
 119 }
 120
 121 static void
 122 rmtconnaborted()
 123 {
 124
 125         errx(1, "Lost connection to remote host.");
 126 }
 127
 128 void
 129 rmtgetconn()
 130 {
 131         register char *cp;
 132         static struct servent *sp = NULL;
 133         static struct passwd *pwd = NULL;
 134 #ifdef notdef
 135         static int on = 1;
 136 #endif
 137         char *tuser;
 138         int size;
 139         int maxseg;
 140
 141         if (sp == NULL) {
 142                 sp = getservbyname("shell", "tcp");
 143                 if (sp == NULL)
 144                         errx(1, "shell/tcp: unknown service");
 145                 pwd = getpwuid(getuid());
 146                 if (pwd == NULL)
 147                         errx(1, "who are you?");
 148         }
 149         if ((cp = strchr(rmtpeer, '@')) != NULL) {
 150                 tuser = rmtpeer;
 151                 *cp = '\0';
 152                 if (!okname(tuser))
 153                         exit(1);
 154                 rmtpeer = ++cp;
 155         } else
 156                 tuser = pwd->pw_name;
 157         rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name, tuser,
 158             _PATH_RMT, (int *)0);
 159         size = ntrec * TP_BSIZE;
 160         if (size > 60 * 1024)           /* XXX */
 161                 size = 60 * 1024;
 162         /* Leave some space for rmt request/response protocol */
 163         size += 2 * 1024;
 164         while (size > TP_BSIZE &&
 165             setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
 166                     size -= TP_BSIZE;
 167         (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
 168         maxseg = 1024;
 169         if (setsockopt(rmtape, IPPROTO_TCP, TCP_MAXSEG,
 170             &maxseg, sizeof (maxseg)) < 0)
 171                 perror("TCP_MAXSEG setsockopt");
 172
 173 #ifdef notdef
 174         if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
 175                 perror("TCP_NODELAY setsockopt");
 176 #endif
 177 }
 178
 179 static int
 180 okname(cp0)
 181         char *cp0;
 182 {
 183         register char *cp;
 184         register int c;
 185
 186         for (cp = cp0; *cp; cp++) {
 187                 c = *cp;
 188                 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
 189                         warnx("invalid user name: %s", cp0);
 190                         return (0);
 191                 }
 192         }
 193         return (1);
 194 }
 195
 196 int
 197 rmtopen(tape, mode)
 198         char *tape;
 199         int mode;
 200 {
 201         char buf[256];
 202
 203         (void)sprintf(buf, "O%s\n%d\n", tape, mode);
 204         rmtstate = TS_OPEN;
 205         return (rmtcall(tape, buf));
 206 }
 207
 208 void
 209 rmtclose()
 210 {
 211
 212         if (rmtstate != TS_OPEN)
 213                 return;
 214         rmtcall("close", "C\n");
 215         rmtstate = TS_CLOSED;
 216 }
 217
 218 int
 219 rmtread(buf, count)
 220         char *buf;
 221         int count;
 222 {
 223         char line[30];
 224         int n, i, cc;
 225         extern errno;
 226
 227         (void)sprintf(line, "R%d\n", count);
 228         n = rmtcall("read", line);
 229         if (n < 0) {
 230                 errno = n;
 231                 return (-1);
 232         }
 233         for (i = 0; i < n; i += cc) {
 234                 cc = read(rmtape, buf+i, n - i);
 235                 if (cc <= 0) {
 236                         rmtconnaborted();
 237                 }
 238         }
 239         return (n);
 240 }
 241
 242 int
 243 rmtwrite(buf, count)
 244         char *buf;
 245         int count;
 246 {
 247         char line[30];
 248
 249         (void)sprintf(line, "W%d\n", count);
 250         write(rmtape, line, strlen(line));
 251         write(rmtape, buf, count);
 252         return (rmtreply("write"));
 253 }
 254
 255 void
 256 rmtwrite0(count)
 257         int count;
 258 {
 259         char line[30];
 260
 261         (void)sprintf(line, "W%d\n", count);
 262         write(rmtape, line, strlen(line));
 263 }
 264
 265 void
 266 rmtwrite1(buf, count)
 267         char *buf;
 268         int count;
 269 {
 270
 271         write(rmtape, buf, count);
 272 }
 273
 274 int
 275 rmtwrite2()
 276 {
 277
 278         return (rmtreply("write"));
 279 }
 280
 281 int
 282 rmtseek(offset, pos)
 283         int offset, pos;
 284 {
 285         char line[80];
 286
 287         (void)sprintf(line, "L%d\n%d\n", offset, pos);
 288         return (rmtcall("seek", line));
 289 }
 290
 291 struct  mtget mts;
 292
 293 struct mtget *
 294 rmtstatus()
 295 {
 296         register int i;
 297         register char *cp;
 298
 299         if (rmtstate != TS_OPEN)
 300                 return (NULL);
 301         rmtcall("status", "S\n");
 302         for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
 303                 *cp++ = rmtgetb();
 304         return (&mts);
 305 }
 306
 307 int
 308 rmtioctl(cmd, count)
 309         int cmd, count;
 310 {
 311         char buf[256];
 312
 313         if (count < 0)
 314                 return (-1);
 315         (void)sprintf(buf, "I%d\n%d\n", cmd, count);
 316         return (rmtcall("ioctl", buf));
 317 }
 318
 319 static int
 320 rmtcall(cmd, buf)
 321         char *cmd, *buf;
 322 {
 323
 324         if (write(rmtape, buf, strlen(buf)) != strlen(buf))
 325                 rmtconnaborted();
 326         return (rmtreply(cmd));
 327 }
 328
 329 static int
 330 rmtreply(cmd)
 331         char *cmd;
 332 {
 333         register char *cp;
 334         char code[30], emsg[BUFSIZ];
 335
 336         rmtgets(code, sizeof (code));
 337         if (*code == 'E' || *code == 'F') {
 338                 rmtgets(emsg, sizeof (emsg));
 339                 msg("%s: %s", cmd, emsg);
 340                 if (*code == 'F') {
 341                         rmtstate = TS_CLOSED;
 342                         return (-1);
 343                 }
 344                 return (-1);
 345         }
 346         if (*code != 'A') {
 347                 /* Kill trailing newline */
 348                 cp = code + strlen(code);
 349                 if (cp > code && *--cp == '\n')
 350                         *cp = '\0';
 351
 352                 msg("Protocol to remote tape server botched (code \"%s\").\n",
 353                     code);
 354                 rmtconnaborted();
 355         }
 356         return (atoi(code + 1));
 357 }
 358
 359 int
 360 rmtgetb()
 361 {
 362         char c;
 363
 364         if (read(rmtape, &c, 1) != 1)
 365                 rmtconnaborted();
 366         return (c);
 367 }
 368
 369 /* Get a line (guaranteed to have a trailing newline). */
 370 void
 371 rmtgets(line, len)
 372         char *line;
 373         int len;
 374 {
 375         register char *cp = line;
 376
 377         while (len > 1) {
 378                 *cp = rmtgetb();
 379                 if (*cp == '\n') {
 380                         cp[1] = '\0';
 381                         return;
 382                 }
 383                 cp++;
 384                 len--;
 385         }
 386         *cp = '\0';
 387         msg("Protocol to remote tape server botched.\n");
 388         msg("(rmtgets got \"%s\").\n", line);
 389         rmtconnaborted();
 390 }