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 1.22 2002/07/19 14:57:39 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 #ifdef __linux__
  53 #include <sys/types.h>
  54 #ifdef HAVE_EXT2FS_EXT2_FS_H
  55 #include <ext2fs/ext2_fs.h>
  56 #else
  57 #include <linux/ext2_fs.h>
  58 #endif
  59 #include <bsdcompat.h>
  60 #include <signal.h>
  61 #elif defined sunos
  62 #include <sys/vnode.h>
  63
  64 #include <ufs/inode.h>
  65 #else
  66 #include <ufs/ufs/dinode.h>
  67 #endif
  68
  69 #include <netinet/in.h>
  70 #include <netinet/in_systm.h>
  71 #include <netinet/ip.h>
  72 #include <netinet/tcp.h>
  73
  74 #include <protocols/dumprestore.h>
  75
  76 #include <ctype.h>
  77 #include <errno.h>
  78 #include <compaterr.h>
  79 #include <netdb.h>
  80 #include <pwd.h>
  81 #include <stdio.h>
  82 #ifdef __STDC__
  83 #include <stdlib.h>
  84 #include <string.h>
  85 #include <unistd.h>
  86 #endif
  87
  88 #ifdef  __linux__
  89 #include <ext2fs/ext2fs.h>
  90 #endif
  91
  92 #include <pathnames.h>
  93 #include "dump.h"       /* for X_STARTUP, X_ABORT etc */
  94
  95 #define TS_CLOSED       0
  96 #define TS_OPEN         1
  97
  98 static  int rmtstate = TS_CLOSED;
  99 static  int tormtape = -1;
 100 static  int fromrmtape = -1;
 101 int rshpid = -1;
 102 static  const char *rmtpeer = 0;
 103
 104 static  int okname __P((const char *));
 105 static  int rmtcall __P((const char *, const char *));
 106 static  void rmtconnaborted __P((int));
 107 static  int rmtgetb __P((void));
 108 static  int rmtgetconn __P((void));
 109 static  void rmtgets __P((char *, size_t));
 110 static  int rmtreply __P((const char *));
 111 static  int piped_child __P((const char **command));
 112 #ifdef KERBEROS
 113 int     krcmd __P((char **, int /*u_short*/, char *, char *, int *, char *));
 114 #endif
 115
 116 static  int errfd = -1;
 117 extern  int dokerberos;
 118 extern  int ntrec;              /* blocking factor on tape */
 119 #ifndef errno
 120 extern  int errno;
 121 #endif
 122
 123 int
 124 rmthost(const char *host)
 125 {
 126         if (rmtpeer)
 127                 free((void *)rmtpeer);
 128         if ((rmtpeer = strdup(host)) == NULL)
 129                 rmtpeer = host;
 130         signal(SIGPIPE, rmtconnaborted);
 131         return rmtgetconn();
 132 }
 133
 134 static void
 135 rmtconnaborted(UNUSED(int signo))
 136 {
 137         msg("Lost connection to remote host.\n");
 138         if (errfd != -1) {
 139                 fd_set r;
 140                 struct timeval t;
 141
 142                 FD_ZERO(&r);
 143                 FD_SET(errfd, &r);
 144                 t.tv_sec = 0;
 145                 t.tv_usec = 0;
 146                 if (select(errfd + 1, &r, NULL, NULL, &t)) {
 147                         int i;
 148                         char buf[2048];
 149
 150                         if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
 151                                 buf[i] = '\0';
 152                                 msg("on %s: %s%s", rmtpeer, buf,
 153                                         buf[i - 1] == '\n' ? "" : "\n");
 154                         }
 155                 }
 156         }
 157
 158         exit(X_ABORT);
 159 }
 160
 161 static int
 162 rmtgetconn(void)
 163 {
 164         char *cp;
 165         const char *rmt;
 166         static struct servent *sp = NULL;
 167         static struct passwd *pwd = NULL;
 168         const char *tuser;
 169         const char *rsh;
 170         int size;
 171         int throughput;
 172         int on;
 173         char *rmtpeercopy;
 174
 175         rsh = getenv("RSH");
 176
 177         if (!rsh && sp == NULL) {
 178                 sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp");
 179                 if (sp == NULL)
 180                         errx(1, "%s/tcp: unknown service",
 181                             dokerberos ? "kshell" : "shell");
 182         }
 183         if (pwd == NULL) {
 184                 pwd = getpwuid(getuid());
 185                 if (pwd == NULL)
 186                         errx(1, "who are you?");
 187         }
 188         if ((cp = strchr(rmtpeer, '@')) != NULL) {
 189                 tuser = rmtpeer;
 190                 *cp = '\0';
 191                 if (!okname(tuser))
 192                         exit(X_STARTUP);
 193                 rmtpeer = ++cp;
 194         } else
 195                 tuser = pwd->pw_name;
 196         if ((rmt = getenv("RMT")) == NULL)
 197                 rmt = _PATH_RMT;
 198         msg("");
 199
 200         if (rsh) {
 201                 const char *rshcmd[6];
 202                 rshcmd[0] = rsh;
 203                 rshcmd[1] = rmtpeer;
 204                 rshcmd[2] = "-l";
 205                 rshcmd[3] = tuser;
 206                 rshcmd[4] = rmt;
 207                 rshcmd[5] = NULL;
 208
 209                 /* Restore the uid and gid. We really don't want
 210                  * to execute whatever is put into RSH variable with
 211                  * more priviledges than needed... */
 212                 setuid(getuid());
 213                 setgid(getgid());
 214
 215                 if ((rshpid = piped_child(rshcmd)) < 0) {
 216                         msg("cannot open connection\n");
 217                         return 0;
 218                 }
 219         }
 220         else {
 221                 /* Copy rmtpeer to rmtpeercopy to ignore the
 222                    return value from rcmd. I cannot figure if
 223                    this is this a bug in rcmd or in my code... */
 224                 rmtpeercopy = (char *)rmtpeer;
 225 #ifdef KERBEROS
 226                 if (dokerberos)
 227                         tormtape = krcmd(&rmtpeercopy, sp->s_port, tuser, rmt, &errfd,
 228                                        (char *)0);
 229                 else
 230 #endif
 231                         tormtape = rcmd(&rmtpeercopy, (u_short)sp->s_port, pwd->pw_name,
 232                                       tuser, rmt, &errfd);
 233                 if (tormtape < 0) {
 234                         msg("login to %s as %s failed.\n", rmtpeer, tuser);
 235                         return 0;
 236                 }
 237                 size = ntrec * TP_BSIZE;
 238                 if (size > 60 * 1024)           /* XXX */
 239                         size = 60 * 1024;
 240                 /* Leave some space for rmt request/response protocol */
 241                 size += 2 * 1024;
 242                 while (size > TP_BSIZE &&
 243                     setsockopt(tormtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
 244                             size -= TP_BSIZE;
 245                 (void)setsockopt(tormtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
 246                 throughput = IPTOS_THROUGHPUT;
 247                 if (setsockopt(tormtape, IPPROTO_IP, IP_TOS,
 248                     &throughput, sizeof(throughput)) < 0)
 249                         perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
 250                 on = 1;
 251                 if (setsockopt(tormtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
 252                         perror("TCP_NODELAY setsockopt");
 253                 fromrmtape = tormtape;
 254         }
 255         (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
 256         return 1;
 257 }
 258
 259 static int
 260 okname(const char *cp0)
 261 {
 262         const char *cp;
 263         int c;
 264
 265         for (cp = cp0; *cp; cp++) {
 266                 c = *cp;
 267                 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
 268                         warnx("invalid user name %s\n", cp0);
 269                         return (0);
 270                 }
 271         }
 272         return (1);
 273 }
 274
 275 int
 276 rmtopen(const char *tape, const char *mode)
 277 {
 278         char buf[MAXPATHLEN];
 279
 280         (void)snprintf(buf, sizeof (buf), "O%s\n%s\n", tape, mode);
 281         rmtstate = TS_OPEN;
 282         return (rmtcall(tape, buf));
 283 }
 284
 285 void
 286 rmtclose(void)
 287 {
 288
 289         if (rmtstate != TS_OPEN)
 290                 return;
 291         rmtcall("close", "C\n");
 292         rmtstate = TS_CLOSED;
 293 }
 294
 295 int
 296 rmtread(char *buf, size_t count)
 297 {
 298         char line[30];
 299         int n, i;
 300         ssize_t cc;
 301
 302         (void)snprintf(line, sizeof (line), "R%u\n", (unsigned)count);
 303         n = rmtcall("read", line);
 304         if (n < 0)
 305                 /* rmtcall() properly sets errno for us on errors. */
 306                 return (n);
 307         for (i = 0; i < n; i += cc) {
 308                 cc = read(fromrmtape, buf+i, n - i);
 309                 if (cc <= 0)
 310                         rmtconnaborted(0);
 311         }
 312         return (n);
 313 }
 314
 315 int
 316 rmtwrite(const char *buf, size_t count)
 317 {
 318         char line[30];
 319
 320         (void)snprintf(line, sizeof (line), "W%ld\n", (long)count);
 321         write(tormtape, line, strlen(line));
 322         write(tormtape, buf, count);
 323         return (rmtreply("write"));
 324 }
 325
 326 int
 327 rmtseek(int offset, int pos)
 328 {
 329         char line[80];
 330
 331         (void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
 332         return (rmtcall("seek", line));
 333 }
 334
 335 struct  mtget mts;
 336
 337 struct mtget *
 338 rmtstatus(void)
 339 {
 340         int i;
 341         char *cp;
 342
 343         if (rmtstate != TS_OPEN)
 344                 return (NULL);
 345         rmtcall("status", "S\n");
 346         for (i = 0, cp = (char *)&mts; i < (int)sizeof(mts); i++)
 347                 *cp++ = rmtgetb();
 348         return (&mts);
 349 }
 350
 351 int
 352 rmtioctl(int cmd, int count)
 353 {
 354         char buf[256];
 355
 356         if (count < 0)
 357                 return (-1);
 358         (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
 359         return (rmtcall("ioctl", buf));
 360 }
 361
 362 static int
 363 rmtcall(const char *cmd, const char *buf)
 364 {
 365
 366         if (write(tormtape, buf, strlen(buf)) != (ssize_t)strlen(buf))
 367                 rmtconnaborted(0);
 368         return (rmtreply(cmd));
 369 }
 370
 371 static int
 372 rmtreply(const char *cmd)
 373 {
 374         char *cp;
 375         char code[30], emsg[BUFSIZ];
 376
 377         rmtgets(code, sizeof (code));
 378         if (*code == 'E' || *code == 'F') {
 379                 rmtgets(emsg, sizeof (emsg));
 380                 msg("%s: %s", cmd, emsg);
 381                 errno = atoi(code + 1);
 382                 if (*code == 'F')
 383                         rmtstate = TS_CLOSED;
 384                 return (-1);
 385         }
 386         if (*code != 'A') {
 387                 /* Kill trailing newline */
 388                 cp = code + strlen(code);
 389                 if (cp > code && *--cp == '\n')
 390                         *cp = '\0';
 391
 392                 msg("Protocol to remote tape server botched (code \"%s\").\n",
 393                     code);
 394                 rmtconnaborted(0);
 395         }
 396         return (atoi(code + 1));
 397 }
 398
 399 static int
 400 rmtgetb(void)
 401 {
 402         char c;
 403
 404         if (read(fromrmtape, &c, 1) != 1)
 405                 rmtconnaborted(0);
 406         return (c);
 407 }
 408
 409 /* Get a line (guaranteed to have a trailing newline). */
 410 static void
 411 rmtgets(char *line, size_t len)
 412 {
 413         char *cp = line;
 414
 415         while (len > 1) {
 416                 *cp = rmtgetb();
 417                 if (*cp == '\n') {
 418                         cp[1] = '\0';
 419                         return;
 420                 }
 421                 cp++;
 422                 len--;
 423         }
 424         *cp = '\0';
 425         msg("Protocol to remote tape server botched.\n");
 426         msg("(rmtgets got \"%s\").\n", line);
 427         rmtconnaborted(0);
 428 }
 429
 430 int piped_child(const char **command) {
 431         int pid;
 432         int to_child_pipe[2];
 433         int from_child_pipe[2];
 434
 435         if (pipe (to_child_pipe) < 0) {
 436                 msg ("cannot create pipe: %s\n", strerror(errno));
 437                 return -1;
 438         }
 439         if (pipe (from_child_pipe) < 0) {
 440                 msg ("cannot create pipe: %s\n", strerror(errno));
 441                 return -1;
 442         }
 443         pid = fork ();
 444         if (pid < 0) {
 445                 msg ("cannot fork: %s\n", strerror(errno));
 446                 return -1;
 447         }
 448         if (pid == 0) {
 449                 if (dup2 (to_child_pipe[0], STDIN_FILENO) < 0) {
 450                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 451                         exit(1);
 452                 }
 453                 if (close (to_child_pipe[1]) < 0) {
 454                         msg ("cannot close pipe: %s\n", strerror(errno));
 455                         exit(1);
 456                 }
 457                 if (close (from_child_pipe[0]) < 0) {
 458                         msg ("cannot close pipe: %s\n", strerror(errno));
 459                         exit(1);
 460                 }
 461                 if (dup2 (from_child_pipe[1], STDOUT_FILENO) < 0) {
 462                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 463                         exit(1);
 464                 }
 465                 setpgid(0, getpid());
 466                 execvp (command[0], (char *const *) command);
 467                 msg("cannot exec %s: %s\n", command[0], strerror(errno));
 468                 exit(1);
 469         }
 470         if (close (to_child_pipe[0]) < 0) {
 471                 msg ("cannot close pipe: %s\n", strerror(errno));
 472                 return -1;
 473         }
 474         if (close (from_child_pipe[1]) < 0) {
 475                 msg ("cannot close pipe: %s\n", strerror(errno));
 476                 return -1;
 477         }
 478         tormtape = to_child_pipe[1];
 479         fromrmtape = from_child_pipe[0];
 480         return pid;
 481 }