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>, 1994-1997
   5  *      Stelian Pop <stelian@popies.net>, 1999-2000
   6  *      Stelian Pop <stelian@popies.net> - Alcôve <www.alcove.com>, 2000-2002
   7  */
   8
   9 /*-
  10  * Copyright (c) 1980, 1993
  11  *      The Regents of the University of California.  All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  */
  41
  42 #ifndef lint
  43 static const char rcsid[] =
  44         "$Id: dumprmt.c,v 1.25 2003/02/12 11:02:29 stelian Exp $";
  45 #endif /* not lint */
  46
  47 #include <config.h>
  48 #include <sys/param.h>
  49 #include <sys/mtio.h>
  50 #include <sys/socket.h>
  51 #include <sys/time.h>
  52 #include <fcntl.h>
  53 #ifdef __linux__
  54 #include <sys/types.h>
  55 #ifdef HAVE_EXT2FS_EXT2_FS_H
  56 #include <ext2fs/ext2_fs.h>
  57 #else
  58 #include <linux/ext2_fs.h>
  59 #endif
  60 #include <bsdcompat.h>
  61 #include <signal.h>
  62 #elif defined sunos
  63 #include <sys/vnode.h>
  64
  65 #include <ufs/inode.h>
  66 #else
  67 #include <ufs/ufs/dinode.h>
  68 #endif
  69
  70 #include <netinet/in.h>
  71 #include <netinet/in_systm.h>
  72 #include <netinet/ip.h>
  73 #include <netinet/tcp.h>
  74
  75 #include <protocols/dumprestore.h>
  76
  77 #include <ctype.h>
  78 #include <errno.h>
  79 #include <compaterr.h>
  80 #include <rmtflags.h>
  81 #include <netdb.h>
  82 #include <pwd.h>
  83 #include <stdio.h>
  84 #ifdef __STDC__
  85 #include <stdlib.h>
  86 #include <string.h>
  87 #include <unistd.h>
  88 #endif
  89
  90 #ifdef  __linux__
  91 #include <ext2fs/ext2fs.h>
  92 #endif
  93
  94 #include <pathnames.h>
  95 #include "dump.h"       /* for X_STARTUP, X_ABORT etc */
  96
  97 #define TS_CLOSED       0
  98 #define TS_OPEN         1
  99
 100 static  int rmtstate = TS_CLOSED;
 101 static  int tormtape = -1;
 102 static  int fromrmtape = -1;
 103 int rshpid = -1;
 104 static  const char *rmtpeer = 0;
 105
 106 static  int okname __P((const char *));
 107 static  OFF_T rmtcall __P((const char *, const char *));
 108 static  void rmtconnaborted __P((int));
 109 static  int rmtgetb __P((void));
 110 static  int rmtgetconn __P((void));
 111 static  void rmtgets __P((char *, size_t));
 112 static  OFF_T rmtreply __P((const char *));
 113 static  int piped_child __P((const char **command));
 114 #ifdef KERBEROS
 115 int     krcmd __P((char **, int /*u_short*/, char *, char *, int *, char *));
 116 #endif
 117
 118 static  int errfd = -1;
 119 extern  int dokerberos;
 120 extern  int ntrec;              /* blocking factor on tape */
 121 #ifndef errno
 122 extern  int errno;
 123 #endif
 124
 125 int
 126 rmthost(const char *host)
 127 {
 128         if (rmtpeer)
 129                 free((void *)rmtpeer);
 130         if ((rmtpeer = strdup(host)) == NULL)
 131                 rmtpeer = host;
 132         signal(SIGPIPE, rmtconnaborted);
 133         return rmtgetconn();
 134 }
 135
 136 static void
 137 rmtconnaborted(UNUSED(int signo))
 138 {
 139         msg("Lost connection to remote host.\n");
 140         if (errfd != -1) {
 141                 fd_set r;
 142                 struct timeval t;
 143
 144                 FD_ZERO(&r);
 145                 FD_SET(errfd, &r);
 146                 t.tv_sec = 0;
 147                 t.tv_usec = 0;
 148                 if (select(errfd + 1, &r, NULL, NULL, &t)) {
 149                         int i;
 150                         char buf[2048];
 151
 152                         if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
 153                                 buf[i] = '\0';
 154                                 msg("on %s: %s%s", rmtpeer, buf,
 155                                         buf[i - 1] == '\n' ? "" : "\n");
 156                         }
 157                 }
 158         }
 159
 160         exit(X_ABORT);
 161 }
 162
 163 static int
 164 rmtgetconn(void)
 165 {
 166         char *cp;
 167         const char *rmt;
 168         static struct servent *sp = NULL;
 169         static struct passwd *pwd = NULL;
 170         const char *tuser;
 171         const char *rsh;
 172         int size;
 173         int throughput;
 174         int on;
 175         char *rmtpeercopy;
 176
 177         rsh = getenv("RSH");
 178
 179         if (!rsh && sp == NULL) {
 180                 sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp");
 181                 if (sp == NULL)
 182                         errx(1, "%s/tcp: unknown service",
 183                             dokerberos ? "kshell" : "shell");
 184         }
 185         if (pwd == NULL) {
 186                 pwd = getpwuid(getuid());
 187                 if (pwd == NULL)
 188                         errx(1, "who are you?");
 189         }
 190         if ((cp = strchr(rmtpeer, '@')) != NULL) {
 191                 tuser = rmtpeer;
 192                 *cp = '\0';
 193                 if (!okname(tuser))
 194                         exit(X_STARTUP);
 195                 rmtpeer = ++cp;
 196         } else
 197                 tuser = pwd->pw_name;
 198         if ((rmt = getenv("RMT")) == NULL)
 199                 rmt = _PATH_RMT;
 200         msg("");
 201
 202         if (rsh) {
 203                 const char *rshcmd[6];
 204                 rshcmd[0] = rsh;
 205                 rshcmd[1] = rmtpeer;
 206                 rshcmd[2] = "-l";
 207                 rshcmd[3] = tuser;
 208                 rshcmd[4] = rmt;
 209                 rshcmd[5] = NULL;
 210
 211                 /* Restore the uid and gid. We really don't want
 212                  * to execute whatever is put into RSH variable with
 213                  * more priviledges than needed... */
 214                 setuid(getuid());
 215                 setgid(getgid());
 216
 217                 if ((rshpid = piped_child(rshcmd)) < 0) {
 218                         msg("cannot open connection\n");
 219                         return 0;
 220                 }
 221         }
 222         else {
 223                 /* Copy rmtpeer to rmtpeercopy to ignore the
 224                    return value from rcmd. I cannot figure if
 225                    this is this a bug in rcmd or in my code... */
 226                 rmtpeercopy = (char *)rmtpeer;
 227 #ifdef KERBEROS
 228                 if (dokerberos)
 229                         tormtape = krcmd(&rmtpeercopy, sp->s_port, tuser, rmt, &errfd,
 230                                        (char *)0);
 231                 else
 232 #endif
 233                         tormtape = rcmd(&rmtpeercopy, (u_short)sp->s_port, pwd->pw_name,
 234                                       tuser, rmt, &errfd);
 235                 if (tormtape < 0) {
 236                         msg("login to %s as %s failed.\n", rmtpeer, tuser);
 237                         return 0;
 238                 }
 239                 size = ntrec * TP_BSIZE;
 240                 if (size > 60 * 1024)           /* XXX */
 241                         size = 60 * 1024;
 242                 /* Leave some space for rmt request/response protocol */
 243                 size += 2 * 1024;
 244                 while (size > TP_BSIZE &&
 245                     setsockopt(tormtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
 246                             size -= TP_BSIZE;
 247                 (void)setsockopt(tormtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
 248                 throughput = IPTOS_THROUGHPUT;
 249                 if (setsockopt(tormtape, IPPROTO_IP, IP_TOS,
 250                     &throughput, sizeof(throughput)) < 0)
 251                         perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
 252                 on = 1;
 253                 if (setsockopt(tormtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
 254                         perror("TCP_NODELAY setsockopt");
 255                 fromrmtape = tormtape;
 256         }
 257         (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
 258         return 1;
 259 }
 260
 261 static int
 262 okname(const char *cp0)
 263 {
 264         const char *cp;
 265         int c;
 266
 267         for (cp = cp0; *cp; cp++) {
 268                 c = *cp;
 269                 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
 270                         warnx("invalid user name %s\n", cp0);
 271                         return (0);
 272                 }
 273         }
 274         return (1);
 275 }
 276
 277 int
 278 rmtopen(const char *tape, const int mode)
 279 {
 280         char buf[MAXPATHLEN];
 281         char *rmtflags;
 282
 283         rmtflags = rmtflags_tochar(mode);
 284         (void)snprintf(buf, sizeof (buf), "O%s\n%d %s\n",
 285                        tape,
 286                        mode & O_ACCMODE,
 287                        rmtflags);
 288         free(rmtflags);
 289         rmtstate = TS_OPEN;
 290         return (rmtcall(tape, buf));
 291 }
 292
 293 void
 294 rmtclose(void)
 295 {
 296
 297         if (rmtstate != TS_OPEN)
 298                 return;
 299         rmtcall("close", "C\n");
 300         rmtstate = TS_CLOSED;
 301 }
 302
 303 int
 304 rmtread(char *buf, size_t count)
 305 {
 306         char line[30];
 307         int n, i;
 308         ssize_t cc;
 309
 310         (void)snprintf(line, sizeof (line), "R%u\n", (unsigned)count);
 311         n = rmtcall("read", line);
 312         if (n < 0)
 313                 /* rmtcall() properly sets errno for us on errors. */
 314                 return (n);
 315         for (i = 0; i < n; i += cc) {
 316                 cc = read(fromrmtape, buf+i, n - i);
 317                 if (cc <= 0)
 318                         rmtconnaborted(0);
 319         }
 320         return (n);
 321 }
 322
 323 int
 324 rmtwrite(const char *buf, size_t count)
 325 {
 326         char line[30];
 327
 328         (void)snprintf(line, sizeof (line), "W%ld\n", (long)count);
 329         write(tormtape, line, strlen(line));
 330         write(tormtape, buf, count);
 331         return (rmtreply("write"));
 332 }
 333
 334 OFF_T
 335 rmtseek(OFF_T offset, int pos)
 336 {
 337         char line[80];
 338
 339         (void)snprintf(line, sizeof (line), "L%lld\n%d\n", (long long)offset, pos);
 340         return (rmtcall("seek", line));
 341 }
 342
 343 struct  mtget mts;
 344
 345 struct mtget *
 346 rmtstatus(void)
 347 {
 348         int i;
 349         char *cp;
 350
 351         if (rmtstate != TS_OPEN)
 352                 return (NULL);
 353         rmtcall("status", "S\n");
 354         for (i = 0, cp = (char *)&mts; i < (int)sizeof(mts); i++)
 355                 *cp++ = rmtgetb();
 356         return (&mts);
 357 }
 358
 359 int
 360 rmtioctl(int cmd, int count)
 361 {
 362         char buf[256];
 363
 364         if (count < 0)
 365                 return (-1);
 366         (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
 367         return (rmtcall("ioctl", buf));
 368 }
 369
 370 static OFF_T
 371 rmtcall(const char *cmd, const char *buf)
 372 {
 373
 374         if (write(tormtape, buf, strlen(buf)) != (ssize_t)strlen(buf))
 375                 rmtconnaborted(0);
 376         return (rmtreply(cmd));
 377 }
 378
 379 static OFF_T
 380 rmtreply(const char *cmd)
 381 {
 382         char *cp;
 383         char code[30], emsg[BUFSIZ];
 384
 385         rmtgets(code, sizeof (code));
 386         if (*code == 'E' || *code == 'F') {
 387                 rmtgets(emsg, sizeof (emsg));
 388                 msg("%s: %s", cmd, emsg);
 389                 errno = atoi(code + 1);
 390                 if (*code == 'F')
 391                         rmtstate = TS_CLOSED;
 392                 return (-1);
 393         }
 394         if (*code != 'A') {
 395                 /* Kill trailing newline */
 396                 cp = code + strlen(code);
 397                 if (cp > code && *--cp == '\n')
 398                         *cp = '\0';
 399
 400                 msg("Protocol to remote tape server botched (code \"%s\").\n",
 401                     code);
 402                 rmtconnaborted(0);
 403         }
 404         return (OFF_T)(atoll(code + 1));
 405 }
 406
 407 static int
 408 rmtgetb(void)
 409 {
 410         char c;
 411
 412         if (read(fromrmtape, &c, 1) != 1)
 413                 rmtconnaborted(0);
 414         return (c);
 415 }
 416
 417 /* Get a line (guaranteed to have a trailing newline). */
 418 static void
 419 rmtgets(char *line, size_t len)
 420 {
 421         char *cp = line;
 422
 423         while (len > 1) {
 424                 *cp = rmtgetb();
 425                 if (*cp == '\n') {
 426                         cp[1] = '\0';
 427                         return;
 428                 }
 429                 cp++;
 430                 len--;
 431         }
 432         *cp = '\0';
 433         msg("Protocol to remote tape server botched.\n");
 434         msg("(rmtgets got \"%s\").\n", line);
 435         rmtconnaborted(0);
 436 }
 437
 438 int piped_child(const char **command) {
 439         int pid;
 440         int to_child_pipe[2];
 441         int from_child_pipe[2];
 442
 443         if (pipe (to_child_pipe) < 0) {
 444                 msg ("cannot create pipe: %s\n", strerror(errno));
 445                 return -1;
 446         }
 447         if (pipe (from_child_pipe) < 0) {
 448                 msg ("cannot create pipe: %s\n", strerror(errno));
 449                 return -1;
 450         }
 451         pid = fork ();
 452         if (pid < 0) {
 453                 msg ("cannot fork: %s\n", strerror(errno));
 454                 return -1;
 455         }
 456         if (pid == 0) {
 457                 if (dup2 (to_child_pipe[0], STDIN_FILENO) < 0) {
 458                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 459                         exit(1);
 460                 }
 461                 if (close (to_child_pipe[1]) < 0) {
 462                         msg ("cannot close pipe: %s\n", strerror(errno));
 463                         exit(1);
 464                 }
 465                 if (close (from_child_pipe[0]) < 0) {
 466                         msg ("cannot close pipe: %s\n", strerror(errno));
 467                         exit(1);
 468                 }
 469                 if (dup2 (from_child_pipe[1], STDOUT_FILENO) < 0) {
 470                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 471                         exit(1);
 472                 }
 473                 setpgid(0, getpid());
 474                 execvp (command[0], (char *const *) command);
 475                 msg("cannot exec %s: %s\n", command[0], strerror(errno));
 476                 exit(1);
 477         }
 478         if (close (to_child_pipe[0]) < 0) {
 479                 msg ("cannot close pipe: %s\n", strerror(errno));
 480                 return -1;
 481         }
 482         if (close (from_child_pipe[1]) < 0) {
 483                 msg ("cannot close pipe: %s\n", strerror(errno));
 484                 return -1;
 485         }
 486         tormtape = to_child_pipe[1];
 487         fromrmtape = from_child_pipe[0];
 488         return pid;
 489 }