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 1.7 1999/10/30 22:55:50 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 static  const char *rmtpeer = 0;
 101
 102 static  int okname __P((const char *));
 103 static  int 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  int 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(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         register char *cp;
 163         register 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
 172         rsh = getenv("RSH");
 173
 174         if (!rsh && sp == NULL) {
 175                 sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp");
 176                 if (sp == NULL)
 177                         errx(1, "%s/tcp: unknown service",
 178                             dokerberos ? "kshell" : "shell");
 179         }
 180         if (pwd == NULL) {
 181                 pwd = getpwuid(getuid());
 182                 if (pwd == NULL)
 183                         errx(1, "who are you?");
 184         }
 185         if ((cp = strchr(rmtpeer, '@')) != NULL) {
 186                 tuser = rmtpeer;
 187                 *cp = '\0';
 188                 if (!okname(tuser))
 189                         exit(X_STARTUP);
 190                 rmtpeer = ++cp;
 191         } else
 192                 tuser = pwd->pw_name;
 193         if ((rmt = getenv("RMT")) == NULL)
 194                 rmt = _PATH_RMT;
 195         msg("");
 196
 197         if (rsh) {
 198                 const char *rshcmd[6];
 199                 rshcmd[0] = rsh;
 200                 rshcmd[1] = rmtpeer;
 201                 rshcmd[2] = "-l";
 202                 rshcmd[3] = tuser;
 203                 rshcmd[4] = rmt;
 204                 rshcmd[5] = NULL;
 205
 206                 if (piped_child(rshcmd) < 0) {
 207                         msg("cannot open connection\n");
 208                         return 0;
 209                 }
 210         }
 211         else {
 212 #ifdef KERBEROS
 213                 if (dokerberos)
 214                         tormtape = krcmd((char **)&rmtpeer, sp->s_port, tuser, rmt, &errfd,
 215                                        (char *)0);
 216                 else
 217 #endif
 218                         tormtape = rcmd((char **)&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
 219                                       tuser, rmt, &errfd);
 220                 if (tormtape < 0) {
 221                         msg("login to %s as %s failed.\n", rmtpeer, tuser);
 222                         return 0;
 223                 }
 224                 size = ntrec * TP_BSIZE;
 225                 if (size > 60 * 1024)           /* XXX */
 226                         size = 60 * 1024;
 227                 /* Leave some space for rmt request/response protocol */
 228                 size += 2 * 1024;
 229                 while (size > TP_BSIZE &&
 230                     setsockopt(tormtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
 231                             size -= TP_BSIZE;
 232                 (void)setsockopt(tormtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
 233                 throughput = IPTOS_THROUGHPUT;
 234                 if (setsockopt(tormtape, IPPROTO_IP, IP_TOS,
 235                     &throughput, sizeof(throughput)) < 0)
 236                         perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
 237                 on = 1;
 238                 if (setsockopt(tormtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
 239                         perror("TCP_NODELAY setsockopt");
 240                 fromrmtape = tormtape;
 241         }
 242         (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
 243         return 1;
 244 }
 245
 246 static int
 247 okname(const char *cp0)
 248 {
 249         register const char *cp;
 250         register int c;
 251
 252         for (cp = cp0; *cp; cp++) {
 253                 c = *cp;
 254                 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
 255                         warnx("invalid user name %s\n", cp0);
 256                         return (0);
 257                 }
 258         }
 259         return (1);
 260 }
 261
 262 int
 263 rmtopen(const char *tape, int mode)
 264 {
 265         char buf[MAXPATHLEN];
 266
 267         (void)snprintf(buf, sizeof (buf), "O%s\n%d\n", tape, mode);
 268         rmtstate = TS_OPEN;
 269         return (rmtcall(tape, buf));
 270 }
 271
 272 void
 273 rmtclose(void)
 274 {
 275
 276         if (rmtstate != TS_OPEN)
 277                 return;
 278         rmtcall("close", "C\n");
 279         rmtstate = TS_CLOSED;
 280 }
 281
 282 int
 283 rmtread(char *buf, size_t count)
 284 {
 285         char line[30];
 286         int n, i;
 287         ssize_t cc;
 288
 289         (void)snprintf(line, sizeof (line), "R%u\n", (unsigned)count);
 290         n = rmtcall("read", line);
 291         if (n < 0)
 292                 /* rmtcall() properly sets errno for us on errors. */
 293                 return (n);
 294         for (i = 0; i < n; i += cc) {
 295                 cc = read(fromrmtape, buf+i, n - i);
 296                 if (cc <= 0)
 297                         rmtconnaborted(0);
 298         }
 299         return (n);
 300 }
 301
 302 int
 303 rmtwrite(const char *buf, size_t count)
 304 {
 305         char line[30];
 306
 307         (void)snprintf(line, sizeof (line), "W%d\n", count);
 308         write(tormtape, line, strlen(line));
 309         write(tormtape, buf, count);
 310         return (rmtreply("write"));
 311 }
 312
 313 int
 314 rmtseek(int offset, int pos)
 315 {
 316         char line[80];
 317
 318         (void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
 319         return (rmtcall("seek", line));
 320 }
 321
 322 struct  mtget mts;
 323
 324 struct mtget *
 325 rmtstatus(void)
 326 {
 327         register int i;
 328         register char *cp;
 329
 330         if (rmtstate != TS_OPEN)
 331                 return (NULL);
 332         rmtcall("status", "S\n");
 333         for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
 334                 *cp++ = rmtgetb();
 335         return (&mts);
 336 }
 337
 338 int
 339 rmtioctl(int cmd, int count)
 340 {
 341         char buf[256];
 342
 343         if (count < 0)
 344                 return (-1);
 345         (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
 346         return (rmtcall("ioctl", buf));
 347 }
 348
 349 static int
 350 rmtcall(const char *cmd, const char *buf)
 351 {
 352
 353         if (write(tormtape, buf, strlen(buf)) != strlen(buf))
 354                 rmtconnaborted(0);
 355         return (rmtreply(cmd));
 356 }
 357
 358 static int
 359 rmtreply(const char *cmd)
 360 {
 361         register char *cp;
 362         char code[30], emsg[BUFSIZ];
 363
 364         rmtgets(code, sizeof (code));
 365         if (*code == 'E' || *code == 'F') {
 366                 rmtgets(emsg, sizeof (emsg));
 367                 msg("%s: %s", cmd, emsg);
 368                 errno = atoi(code + 1);
 369                 if (*code == 'F')
 370                         rmtstate = TS_CLOSED;
 371                 return (-1);
 372         }
 373         if (*code != 'A') {
 374                 /* Kill trailing newline */
 375                 cp = code + strlen(code);
 376                 if (cp > code && *--cp == '\n')
 377                         *cp = '\0';
 378
 379                 msg("Protocol to remote tape server botched (code \"%s\").\n",
 380                     code);
 381                 rmtconnaborted(0);
 382         }
 383         return (atoi(code + 1));
 384 }
 385
 386 static int
 387 rmtgetb(void)
 388 {
 389         char c;
 390
 391         if (read(fromrmtape, &c, 1) != 1)
 392                 rmtconnaborted(0);
 393         return (c);
 394 }
 395
 396 /* Get a line (guaranteed to have a trailing newline). */
 397 static void
 398 rmtgets(char *line, size_t len)
 399 {
 400         register char *cp = line;
 401
 402         while (len > 1) {
 403                 *cp = rmtgetb();
 404                 if (*cp == '\n') {
 405                         cp[1] = '\0';
 406                         return;
 407                 }
 408                 cp++;
 409                 len--;
 410         }
 411         *cp = '\0';
 412         msg("Protocol to remote tape server botched.\n");
 413         msg("(rmtgets got \"%s\").\n", line);
 414         rmtconnaborted(0);
 415 }
 416
 417 int piped_child(const char **command) {
 418         int pid;
 419         int to_child_pipe[2];
 420         int from_child_pipe[2];
 421
 422         if (pipe (to_child_pipe) < 0) {
 423                 msg ("cannot create pipe: %s\n", strerror(errno));
 424                 return -1;
 425         }
 426         if (pipe (from_child_pipe) < 0) {
 427                 msg ("cannot create pipe: %s\n", strerror(errno));
 428                 return -1;
 429         }
 430         pid = fork ();
 431         if (pid < 0) {
 432                 msg ("cannot fork: %s\n", strerror(errno));
 433                 return -1;
 434         }
 435         if (pid == 0) {
 436                 if (dup2 (to_child_pipe[0], STDIN_FILENO) < 0) {
 437                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 438                         exit(1);
 439                 }
 440                 if (close (to_child_pipe[1]) < 0) {
 441                         msg ("cannot close pipe: %s\n", strerror(errno));
 442                         exit(1);
 443                 }
 444                 if (close (from_child_pipe[0]) < 0) {
 445                         msg ("cannot close pipe: %s\n", strerror(errno));
 446                         exit(1);
 447                 }
 448                 if (dup2 (from_child_pipe[1], STDOUT_FILENO) < 0) {
 449                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 450                         exit(1);
 451                 }
 452                 execvp (command[0], (char *const *) command);
 453                 msg("cannot exec %s: %s\n", command[0], strerror(errno));
 454                 exit(1);
 455         }
 456         if (close (to_child_pipe[0]) < 0) {
 457                 msg ("cannot close pipe: %s\n", strerror(errno));
 458                 return -1;
 459         }
 460         if (close (from_child_pipe[1]) < 0) {
 461                 msg ("cannot close pipe: %s\n", strerror(errno));
 462                 return -1;
 463         }
 464         tormtape = to_child_pipe[1];
 465         fromrmtape = from_child_pipe[0];
 466         return pid;
 467 }