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 <pop@cybercable.fr>, 1999
   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 const char rcsid[] =
  43         "$Id: dumprmt.c,v 1.8 1999/11/02 09:35:56 tiniou Exp $";
  44 #endif /* not lint */
  45
  46 #ifdef __linux__
  47 #include <sys/types.h>
  48 #include <linux/types.h>
  49 #endif
  50 #include <sys/param.h>
  51 #include <sys/mtio.h>
  52 #include <sys/socket.h>
  53 #include <sys/time.h>
  54 #ifdef __linux__
  55 #include <linux/ext2_fs.h>
  56 #include <bsdcompat.h>
  57 #include <signal.h>
  58 #else
  59 #ifdef sunos
  60 #include <sys/vnode.h>
  61
  62 #include <ufs/inode.h>
  63 #else
  64 #include <ufs/ufs/dinode.h>
  65 #endif
  66 #endif
  67
  68 #include <netinet/in.h>
  69 #include <netinet/in_systm.h>
  70 #include <netinet/ip.h>
  71 #include <netinet/tcp.h>
  72
  73 #include <protocols/dumprestore.h>
  74
  75 #include <ctype.h>
  76 #include <errno.h>
  77 #include <compaterr.h>
  78 #include <netdb.h>
  79 #include <pwd.h>
  80 #include <stdio.h>
  81 #ifdef __STDC__
  82 #include <stdlib.h>
  83 #include <string.h>
  84 #include <unistd.h>
  85 #endif
  86
  87 #ifdef  __linux__
  88 #include <ext2fs/ext2fs.h>
  89 #endif
  90
  91 #include "pathnames.h"
  92 #include "dump.h"
  93
  94 #define TS_CLOSED       0
  95 #define TS_OPEN         1
  96
  97 static  int rmtstate = TS_CLOSED;
  98 static  int tormtape = -1;
  99 static  int fromrmtape = -1;
 100 int rshpid = -1;
 101 static  const char *rmtpeer = 0;
 102
 103 static  int okname __P((const char *));
 104 static  int rmtcall __P((const char *, const char *));
 105 static  void rmtconnaborted __P((int));
 106 static  int rmtgetb __P((void));
 107 static  int rmtgetconn __P((void));
 108 static  void rmtgets __P((char *, size_t));
 109 static  int rmtreply __P((const char *));
 110 static  int piped_child __P((const char **command));
 111 #ifdef KERBEROS
 112 int     krcmd __P((char **, int /*u_short*/, char *, char *, int *, char *));
 113 #endif
 114
 115 static  int errfd = -1;
 116 extern  int dokerberos;
 117 extern  int ntrec;              /* blocking factor on tape */
 118 #ifndef errno
 119 extern  int errno;
 120 #endif
 121
 122 int
 123 rmthost(const char *host)
 124 {
 125         if (rmtpeer)
 126                 free((void *)rmtpeer);
 127         if ((rmtpeer = strdup(host)) == NULL)
 128                 rmtpeer = host;
 129         signal(SIGPIPE, rmtconnaborted);
 130         return rmtgetconn();
 131 }
 132
 133 static void
 134 rmtconnaborted(int signo)
 135 {
 136         msg("Lost connection to remote host.\n");
 137         if (errfd != -1) {
 138                 fd_set r;
 139                 struct timeval t;
 140
 141                 FD_ZERO(&r);
 142                 FD_SET(errfd, &r);
 143                 t.tv_sec = 0;
 144                 t.tv_usec = 0;
 145                 if (select(errfd + 1, &r, NULL, NULL, &t)) {
 146                         int i;
 147                         char buf[2048];
 148
 149                         if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
 150                                 buf[i] = '\0';
 151                                 msg("on %s: %s%s", rmtpeer, buf,
 152                                         buf[i - 1] == '\n' ? "" : "\n");
 153                         }
 154                 }
 155         }
 156
 157         exit(X_ABORT);
 158 }
 159
 160 static int
 161 rmtgetconn(void)
 162 {
 163         register char *cp;
 164         register const char *rmt;
 165         static struct servent *sp = NULL;
 166         static struct passwd *pwd = NULL;
 167         const char *tuser;
 168         const char *rsh;
 169         int size;
 170         int throughput;
 171         int on;
 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                 if ((rshpid = piped_child(rshcmd)) < 0) {
 208                         msg("cannot open connection\n");
 209                         return 0;
 210                 }
 211         }
 212         else {
 213 #ifdef KERBEROS
 214                 if (dokerberos)
 215                         tormtape = krcmd((char **)&rmtpeer, sp->s_port, tuser, rmt, &errfd,
 216                                        (char *)0);
 217                 else
 218 #endif
 219                         tormtape = rcmd((char **)&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
 220                                       tuser, rmt, &errfd);
 221                 if (tormtape < 0) {
 222                         msg("login to %s as %s failed.\n", rmtpeer, tuser);
 223                         return 0;
 224                 }
 225                 size = ntrec * TP_BSIZE;
 226                 if (size > 60 * 1024)           /* XXX */
 227                         size = 60 * 1024;
 228                 /* Leave some space for rmt request/response protocol */
 229                 size += 2 * 1024;
 230                 while (size > TP_BSIZE &&
 231                     setsockopt(tormtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
 232                             size -= TP_BSIZE;
 233                 (void)setsockopt(tormtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
 234                 throughput = IPTOS_THROUGHPUT;
 235                 if (setsockopt(tormtape, IPPROTO_IP, IP_TOS,
 236                     &throughput, sizeof(throughput)) < 0)
 237                         perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
 238                 on = 1;
 239                 if (setsockopt(tormtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
 240                         perror("TCP_NODELAY setsockopt");
 241                 fromrmtape = tormtape;
 242         }
 243         (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
 244         return 1;
 245 }
 246
 247 static int
 248 okname(const char *cp0)
 249 {
 250         register const char *cp;
 251         register int c;
 252
 253         for (cp = cp0; *cp; cp++) {
 254                 c = *cp;
 255                 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
 256                         warnx("invalid user name %s\n", cp0);
 257                         return (0);
 258                 }
 259         }
 260         return (1);
 261 }
 262
 263 int
 264 rmtopen(const char *tape, int mode)
 265 {
 266         char buf[MAXPATHLEN];
 267
 268         (void)snprintf(buf, sizeof (buf), "O%s\n%d\n", tape, mode);
 269         rmtstate = TS_OPEN;
 270         return (rmtcall(tape, buf));
 271 }
 272
 273 void
 274 rmtclose(void)
 275 {
 276
 277         if (rmtstate != TS_OPEN)
 278                 return;
 279         rmtcall("close", "C\n");
 280         rmtstate = TS_CLOSED;
 281 }
 282
 283 int
 284 rmtread(char *buf, size_t count)
 285 {
 286         char line[30];
 287         int n, i;
 288         ssize_t cc;
 289
 290         (void)snprintf(line, sizeof (line), "R%u\n", (unsigned)count);
 291         n = rmtcall("read", line);
 292         if (n < 0)
 293                 /* rmtcall() properly sets errno for us on errors. */
 294                 return (n);
 295         for (i = 0; i < n; i += cc) {
 296                 cc = read(fromrmtape, buf+i, n - i);
 297                 if (cc <= 0)
 298                         rmtconnaborted(0);
 299         }
 300         return (n);
 301 }
 302
 303 int
 304 rmtwrite(const char *buf, size_t count)
 305 {
 306         char line[30];
 307
 308         (void)snprintf(line, sizeof (line), "W%d\n", count);
 309         write(tormtape, line, strlen(line));
 310         write(tormtape, buf, count);
 311         return (rmtreply("write"));
 312 }
 313
 314 int
 315 rmtseek(int offset, int pos)
 316 {
 317         char line[80];
 318
 319         (void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
 320         return (rmtcall("seek", line));
 321 }
 322
 323 struct  mtget mts;
 324
 325 struct mtget *
 326 rmtstatus(void)
 327 {
 328         register int i;
 329         register char *cp;
 330
 331         if (rmtstate != TS_OPEN)
 332                 return (NULL);
 333         rmtcall("status", "S\n");
 334         for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
 335                 *cp++ = rmtgetb();
 336         return (&mts);
 337 }
 338
 339 int
 340 rmtioctl(int cmd, int count)
 341 {
 342         char buf[256];
 343
 344         if (count < 0)
 345                 return (-1);
 346         (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
 347         return (rmtcall("ioctl", buf));
 348 }
 349
 350 static int
 351 rmtcall(const char *cmd, const char *buf)
 352 {
 353
 354         if (write(tormtape, buf, strlen(buf)) != strlen(buf))
 355                 rmtconnaborted(0);
 356         return (rmtreply(cmd));
 357 }
 358
 359 static int
 360 rmtreply(const char *cmd)
 361 {
 362         register char *cp;
 363         char code[30], emsg[BUFSIZ];
 364
 365         rmtgets(code, sizeof (code));
 366         if (*code == 'E' || *code == 'F') {
 367                 rmtgets(emsg, sizeof (emsg));
 368                 msg("%s: %s", cmd, emsg);
 369                 errno = atoi(code + 1);
 370                 if (*code == 'F')
 371                         rmtstate = TS_CLOSED;
 372                 return (-1);
 373         }
 374         if (*code != 'A') {
 375                 /* Kill trailing newline */
 376                 cp = code + strlen(code);
 377                 if (cp > code && *--cp == '\n')
 378                         *cp = '\0';
 379
 380                 msg("Protocol to remote tape server botched (code \"%s\").\n",
 381                     code);
 382                 rmtconnaborted(0);
 383         }
 384         return (atoi(code + 1));
 385 }
 386
 387 static int
 388 rmtgetb(void)
 389 {
 390         char c;
 391
 392         if (read(fromrmtape, &c, 1) != 1)
 393                 rmtconnaborted(0);
 394         return (c);
 395 }
 396
 397 /* Get a line (guaranteed to have a trailing newline). */
 398 static void
 399 rmtgets(char *line, size_t len)
 400 {
 401         register char *cp = line;
 402
 403         while (len > 1) {
 404                 *cp = rmtgetb();
 405                 if (*cp == '\n') {
 406                         cp[1] = '\0';
 407                         return;
 408                 }
 409                 cp++;
 410                 len--;
 411         }
 412         *cp = '\0';
 413         msg("Protocol to remote tape server botched.\n");
 414         msg("(rmtgets got \"%s\").\n", line);
 415         rmtconnaborted(0);
 416 }
 417
 418 int piped_child(const char **command) {
 419         int pid;
 420         int to_child_pipe[2];
 421         int from_child_pipe[2];
 422
 423         if (pipe (to_child_pipe) < 0) {
 424                 msg ("cannot create pipe: %s\n", strerror(errno));
 425                 return -1;
 426         }
 427         if (pipe (from_child_pipe) < 0) {
 428                 msg ("cannot create pipe: %s\n", strerror(errno));
 429                 return -1;
 430         }
 431         pid = fork ();
 432         if (pid < 0) {
 433                 msg ("cannot fork: %s\n", strerror(errno));
 434                 return -1;
 435         }
 436         if (pid == 0) {
 437                 if (dup2 (to_child_pipe[0], STDIN_FILENO) < 0) {
 438                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 439                         exit(1);
 440                 }
 441                 if (close (to_child_pipe[1]) < 0) {
 442                         msg ("cannot close pipe: %s\n", strerror(errno));
 443                         exit(1);
 444                 }
 445                 if (close (from_child_pipe[0]) < 0) {
 446                         msg ("cannot close pipe: %s\n", strerror(errno));
 447                         exit(1);
 448                 }
 449                 if (dup2 (from_child_pipe[1], STDOUT_FILENO) < 0) {
 450                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 451                         exit(1);
 452                 }
 453                 execvp (command[0], (char *const *) command);
 454                 msg("cannot exec %s: %s\n", command[0], strerror(errno));
 455                 exit(1);
 456         }
 457         if (close (to_child_pipe[0]) < 0) {
 458                 msg ("cannot close pipe: %s\n", strerror(errno));
 459                 return -1;
 460         }
 461         if (close (from_child_pipe[1]) < 0) {
 462                 msg ("cannot close pipe: %s\n", strerror(errno));
 463                 return -1;
 464         }
 465         tormtape = to_child_pipe[1];
 466         fromrmtape = from_child_pipe[0];
 467         return pid;
 468 }