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. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  */
  37
  38 #ifndef lint
  39 static const char rcsid[] =
  40         "$Id: dumprmt.c,v 1.27 2003/03/30 15:40:33 stelian Exp $";
  41 #endif /* not lint */
  42
  43 #include <config.h>
  44 #include <sys/param.h>
  45 #include <sys/mtio.h>
  46 #include <sys/socket.h>
  47 #include <sys/time.h>
  48 #include <fcntl.h>
  49 #ifdef __linux__
  50 #include <sys/types.h>
  51 #ifdef HAVE_EXT2FS_EXT2_FS_H
  52 #include <ext2fs/ext2_fs.h>
  53 #else
  54 #include <linux/ext2_fs.h>
  55 #endif
  56 #include <bsdcompat.h>
  57 #include <signal.h>
  58 #elif defined sunos
  59 #include <sys/vnode.h>
  60
  61 #include <ufs/inode.h>
  62 #else
  63 #include <ufs/ufs/dinode.h>
  64 #endif
  65
  66 #include <netinet/in.h>
  67 #include <netinet/in_systm.h>
  68 #include <netinet/ip.h>
  69 #include <netinet/tcp.h>
  70
  71 #include <protocols/dumprestore.h>
  72
  73 #include <ctype.h>
  74 #include <errno.h>
  75 #include <compaterr.h>
  76 #include <rmtflags.h>
  77 #include <netdb.h>
  78 #include <pwd.h>
  79 #include <stdio.h>
  80 #ifdef __STDC__
  81 #include <stdlib.h>
  82 #include <string.h>
  83 #include <unistd.h>
  84 #endif
  85
  86 #ifdef  __linux__
  87 #include <ext2fs/ext2fs.h>
  88 #endif
  89
  90 #include <pathnames.h>
  91 #include "dump.h"       /* for X_STARTUP, X_ABORT etc */
  92
  93 #define TS_CLOSED       0
  94 #define TS_OPEN         1
  95
  96 static  int rmtstate = TS_CLOSED;
  97 static  int tormtape = -1;
  98 static  int fromrmtape = -1;
  99 int rshpid = -1;
 100 static  const char *rmtpeer = 0;
 101
 102 static  int okname __P((const char *));
 103 static  OFF_T rmtcall __P((const char *, const char *));
 104 static  void rmtconnaborted __P((int));
 105 static  int rmtgetb __P((void));
 106 static  int rmtgetconn __P((void));
 107 static  void rmtgets __P((char *, size_t));
 108 static  OFF_T rmtreply __P((const char *));
 109 static  int piped_child __P((const char **command));
 110 #ifdef KERBEROS
 111 int     krcmd __P((char **, int /*u_short*/, char *, char *, int *, char *));
 112 #endif
 113
 114 static  int errfd = -1;
 115 extern  int dokerberos;
 116 extern  int ntrec;              /* blocking factor on tape */
 117 #ifndef errno
 118 extern  int errno;
 119 #endif
 120
 121 int
 122 rmthost(const char *host)
 123 {
 124         if (rmtpeer)
 125                 free((void *)rmtpeer);
 126         if ((rmtpeer = strdup(host)) == NULL)
 127                 rmtpeer = host;
 128         signal(SIGPIPE, rmtconnaborted);
 129         return rmtgetconn();
 130 }
 131
 132 static void
 133 rmtconnaborted(UNUSED(int signo))
 134 {
 135         msg("Lost connection to remote host.\n");
 136         if (errfd != -1) {
 137                 fd_set r;
 138                 struct timeval t;
 139
 140                 FD_ZERO(&r);
 141                 FD_SET(errfd, &r);
 142                 t.tv_sec = 0;
 143                 t.tv_usec = 0;
 144                 if (select(errfd + 1, &r, NULL, NULL, &t)) {
 145                         int i;
 146                         char buf[2048];
 147
 148                         if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
 149                                 buf[i] = '\0';
 150                                 msg("on %s: %s%s", rmtpeer, buf,
 151                                         buf[i - 1] == '\n' ? "" : "\n");
 152                         }
 153                 }
 154         }
 155
 156         exit(X_ABORT);
 157 }
 158
 159 static int
 160 rmtgetconn(void)
 161 {
 162         char *cp;
 163         const char *rmt;
 164         static struct servent *sp = NULL;
 165         static struct passwd *pwd = NULL;
 166         const char *tuser;
 167         const char *rsh;
 168         int size;
 169         int throughput;
 170         int on;
 171         char *rmtpeercopy;
 172
 173         rsh = getenv("RSH");
 174
 175         if (!rsh && sp == NULL) {
 176                 sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp");
 177                 if (sp == NULL)
 178                         errx(1, "%s/tcp: unknown service",
 179                             dokerberos ? "kshell" : "shell");
 180         }
 181         if (pwd == NULL) {
 182                 pwd = getpwuid(getuid());
 183                 if (pwd == NULL)
 184                         errx(1, "who are you?");
 185         }
 186         if ((cp = strchr(rmtpeer, '@')) != NULL) {
 187                 tuser = rmtpeer;
 188                 *cp = '\0';
 189                 if (!okname(tuser))
 190                         exit(X_STARTUP);
 191                 rmtpeer = ++cp;
 192         } else
 193                 tuser = pwd->pw_name;
 194         if ((rmt = getenv("RMT")) == NULL)
 195                 rmt = _PATH_RMT;
 196         msg("");
 197
 198         if (rsh) {
 199                 const char *rshcmd[6];
 200                 rshcmd[0] = rsh;
 201                 rshcmd[1] = rmtpeer;
 202                 rshcmd[2] = "-l";
 203                 rshcmd[3] = tuser;
 204                 rshcmd[4] = rmt;
 205                 rshcmd[5] = NULL;
 206
 207                 /* Restore the uid and gid. We really don't want
 208                  * to execute whatever is put into RSH variable with
 209                  * more priviledges than needed... */
 210                 setuid(getuid());
 211                 setgid(getgid());
 212
 213                 if ((rshpid = piped_child(rshcmd)) < 0) {
 214                         msg("cannot open connection\n");
 215                         return 0;
 216                 }
 217         }
 218         else {
 219                 /* Copy rmtpeer to rmtpeercopy to ignore the
 220                    return value from rcmd. I cannot figure if
 221                    this is this a bug in rcmd or in my code... */
 222                 rmtpeercopy = (char *)rmtpeer;
 223 #ifdef KERBEROS
 224                 if (dokerberos)
 225                         tormtape = krcmd(&rmtpeercopy, sp->s_port, tuser, rmt, &errfd,
 226                                        (char *)0);
 227                 else
 228 #endif
 229                         tormtape = rcmd(&rmtpeercopy, (u_short)sp->s_port, pwd->pw_name,
 230                                       tuser, rmt, &errfd);
 231                 if (tormtape < 0) {
 232                         msg("login to %s as %s failed.\n", rmtpeer, tuser);
 233                         return 0;
 234                 }
 235                 size = ntrec * TP_BSIZE;
 236                 if (size > 60 * 1024)           /* XXX */
 237                         size = 60 * 1024;
 238                 /* Leave some space for rmt request/response protocol */
 239                 size += 2 * 1024;
 240                 while (size > TP_BSIZE &&
 241                     setsockopt(tormtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
 242                             size -= TP_BSIZE;
 243                 (void)setsockopt(tormtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
 244                 throughput = IPTOS_THROUGHPUT;
 245                 if (setsockopt(tormtape, IPPROTO_IP, IP_TOS,
 246                     &throughput, sizeof(throughput)) < 0)
 247                         perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
 248                 on = 1;
 249                 if (setsockopt(tormtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
 250                         perror("TCP_NODELAY setsockopt");
 251                 fromrmtape = tormtape;
 252         }
 253         (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
 254         return 1;
 255 }
 256
 257 static int
 258 okname(const char *cp0)
 259 {
 260         const char *cp;
 261         int c;
 262
 263         for (cp = cp0; *cp; cp++) {
 264                 c = *cp;
 265                 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
 266                         warnx("invalid user name %s\n", cp0);
 267                         return (0);
 268                 }
 269         }
 270         return (1);
 271 }
 272
 273 int
 274 rmtopen(const char *tape, const int mode)
 275 {
 276         char buf[MAXPATHLEN];
 277         char *rmtflags;
 278
 279         rmtflags = rmtflags_tochar(mode);
 280         (void)snprintf(buf, sizeof (buf), "O%s\n%d %s\n",
 281                        tape,
 282                        mode & O_ACCMODE,
 283                        rmtflags);
 284         free(rmtflags);
 285         rmtstate = TS_OPEN;
 286         return (rmtcall(tape, buf));
 287 }
 288
 289 void
 290 rmtclose(void)
 291 {
 292
 293         if (rmtstate != TS_OPEN)
 294                 return;
 295         rmtcall("close", "C\n");
 296         rmtstate = TS_CLOSED;
 297 }
 298
 299 int
 300 rmtread(char *buf, size_t count)
 301 {
 302         char line[30];
 303         int n, i;
 304         ssize_t cc;
 305
 306         (void)snprintf(line, sizeof (line), "R%u\n", (unsigned)count);
 307         n = rmtcall("read", line);
 308         if (n < 0)
 309                 /* rmtcall() properly sets errno for us on errors. */
 310                 return (n);
 311         for (i = 0; i < n; i += cc) {
 312                 cc = read(fromrmtape, buf+i, n - i);
 313                 if (cc <= 0)
 314                         rmtconnaborted(0);
 315         }
 316         return (n);
 317 }
 318
 319 int
 320 rmtwrite(const char *buf, size_t count)
 321 {
 322         char line[30];
 323
 324         (void)snprintf(line, sizeof (line), "W%ld\n", (long)count);
 325         write(tormtape, line, strlen(line));
 326         write(tormtape, buf, count);
 327         return (rmtreply("write"));
 328 }
 329
 330 OFF_T
 331 rmtseek(OFF_T offset, int pos)
 332 {
 333         char line[80];
 334
 335         (void)snprintf(line, sizeof (line), "L%lld\n%d\n", (long long)offset, pos);
 336         return (rmtcall("seek", line));
 337 }
 338
 339 struct  mtget mts;
 340
 341 struct mtget *
 342 rmtstatus(void)
 343 {
 344         int i;
 345         char *cp;
 346
 347         if (rmtstate != TS_OPEN)
 348                 return (NULL);
 349         i = rmtcall("status", "S");
 350         if (i < 0) return NULL;
 351         if (i != (int)sizeof(mts)) {
 352                 msg("mtget sizes different between host (%d) "
 353                     "and remote tape (%d)", sizeof(mts), i);
 354                 for ( /* empty */; i > 0; --i)
 355                         rmtgetb();
 356                 return NULL;
 357         }
 358         for (i = 0, cp = (char *)&mts; i < (int)sizeof(mts); i++)
 359                 *cp++ = rmtgetb();
 360         return (&mts);
 361 }
 362
 363 int
 364 rmtioctl(int cmd, int count)
 365 {
 366         char buf[256];
 367
 368         if (count < 0)
 369                 return (-1);
 370         (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
 371         return (rmtcall("ioctl", buf));
 372 }
 373
 374 static OFF_T
 375 rmtcall(const char *cmd, const char *buf)
 376 {
 377
 378         if (write(tormtape, buf, strlen(buf)) != (ssize_t)strlen(buf))
 379                 rmtconnaborted(0);
 380         return (rmtreply(cmd));
 381 }
 382
 383 static OFF_T
 384 rmtreply(const char *cmd)
 385 {
 386         char *cp;
 387         char code[30], emsg[BUFSIZ];
 388
 389         rmtgets(code, sizeof (code));
 390         if (*code == 'E' || *code == 'F') {
 391                 rmtgets(emsg, sizeof (emsg));
 392                 msg("%s: %s", cmd, emsg);
 393                 errno = atoi(code + 1);
 394                 if (*code == 'F')
 395                         rmtstate = TS_CLOSED;
 396                 return (-1);
 397         }
 398         if (*code != 'A') {
 399                 /* Kill trailing newline */
 400                 cp = code + strlen(code);
 401                 if (cp > code && *--cp == '\n')
 402                         *cp = '\0';
 403
 404                 msg("Protocol to remote tape server botched (code \"%s\").\n",
 405                     code);
 406                 rmtconnaborted(0);
 407         }
 408         return (OFF_T)(atoll(code + 1));
 409 }
 410
 411 static int
 412 rmtgetb(void)
 413 {
 414         char c;
 415
 416         if (read(fromrmtape, &c, 1) != 1)
 417                 rmtconnaborted(0);
 418         return (c);
 419 }
 420
 421 /* Get a line (guaranteed to have a trailing newline). */
 422 static void
 423 rmtgets(char *line, size_t len)
 424 {
 425         char *cp = line;
 426
 427         while (len > 1) {
 428                 *cp = rmtgetb();
 429                 if (*cp == '\n') {
 430                         cp[1] = '\0';
 431                         return;
 432                 }
 433                 cp++;
 434                 len--;
 435         }
 436         *cp = '\0';
 437         msg("Protocol to remote tape server botched.\n");
 438         msg("(rmtgets got \"%s\").\n", line);
 439         rmtconnaborted(0);
 440 }
 441
 442 int piped_child(const char **command) {
 443         int pid;
 444         int to_child_pipe[2];
 445         int from_child_pipe[2];
 446
 447         if (pipe (to_child_pipe) < 0) {
 448                 msg ("cannot create pipe: %s\n", strerror(errno));
 449                 return -1;
 450         }
 451         if (pipe (from_child_pipe) < 0) {
 452                 msg ("cannot create pipe: %s\n", strerror(errno));
 453                 return -1;
 454         }
 455         pid = fork ();
 456         if (pid < 0) {
 457                 msg ("cannot fork: %s\n", strerror(errno));
 458                 return -1;
 459         }
 460         if (pid == 0) {
 461                 if (dup2 (to_child_pipe[0], STDIN_FILENO) < 0) {
 462                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 463                         exit(1);
 464                 }
 465                 if (close (to_child_pipe[1]) < 0) {
 466                         msg ("cannot close pipe: %s\n", strerror(errno));
 467                         exit(1);
 468                 }
 469                 if (close (from_child_pipe[0]) < 0) {
 470                         msg ("cannot close pipe: %s\n", strerror(errno));
 471                         exit(1);
 472                 }
 473                 if (dup2 (from_child_pipe[1], STDOUT_FILENO) < 0) {
 474                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 475                         exit(1);
 476                 }
 477                 setpgid(0, getpid());
 478                 execvp (command[0], (char *const *) command);
 479                 msg("cannot exec %s: %s\n", command[0], strerror(errno));
 480                 exit(1);
 481         }
 482         if (close (to_child_pipe[0]) < 0) {
 483                 msg ("cannot close pipe: %s\n", strerror(errno));
 484                 return -1;
 485         }
 486         if (close (from_child_pipe[1]) < 0) {
 487                 msg ("cannot close pipe: %s\n", strerror(errno));
 488                 return -1;
 489         }
 490         tormtape = to_child_pipe[1];
 491         fromrmtape = from_child_pipe[0];
 492         return pid;
 493 }