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>, 1999-2000
   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 1.11 2000/01/21 10:17:41 stelian 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         char *rmtpeercopy;
 173
 174         rsh = getenv("RSH");
 175
 176         if (!rsh && sp == NULL) {
 177                 sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp");
 178                 if (sp == NULL)
 179                         errx(1, "%s/tcp: unknown service",
 180                             dokerberos ? "kshell" : "shell");
 181         }
 182         if (pwd == NULL) {
 183                 pwd = getpwuid(getuid());
 184                 if (pwd == NULL)
 185                         errx(1, "who are you?");
 186         }
 187         if ((cp = strchr(rmtpeer, '@')) != NULL) {
 188                 tuser = rmtpeer;
 189                 *cp = '\0';
 190                 if (!okname(tuser))
 191                         exit(X_STARTUP);
 192                 rmtpeer = ++cp;
 193         } else
 194                 tuser = pwd->pw_name;
 195         if ((rmt = getenv("RMT")) == NULL)
 196                 rmt = _PATH_RMT;
 197         msg("");
 198
 199         if (rsh) {
 200                 const char *rshcmd[6];
 201                 rshcmd[0] = rsh;
 202                 rshcmd[1] = rmtpeer;
 203                 rshcmd[2] = "-l";
 204                 rshcmd[3] = tuser;
 205                 rshcmd[4] = rmt;
 206                 rshcmd[5] = NULL;
 207
 208                 if ((rshpid = piped_child(rshcmd)) < 0) {
 209                         msg("cannot open connection\n");
 210                         return 0;
 211                 }
 212         }
 213         else {
 214                 /* Copy rmtpeer to rmtpeercopy to ignore the
 215                    return value from rcmd. I cannot figure if
 216                    this is this a bug in rcmd or in my code... */
 217                 rmtpeercopy = (char *)rmtpeer;
 218 #ifdef KERBEROS
 219                 if (dokerberos)
 220                         tormtape = krcmd(&rmtpeercopy, sp->s_port, tuser, rmt, &errfd,
 221                                        (char *)0);
 222                 else
 223 #endif
 224                         tormtape = rcmd(&rmtpeercopy, (u_short)sp->s_port, pwd->pw_name,
 225                                       tuser, rmt, &errfd);
 226                 if (tormtape < 0) {
 227                         msg("login to %s as %s failed.\n", rmtpeer, tuser);
 228                         return 0;
 229                 }
 230                 size = ntrec * TP_BSIZE;
 231                 if (size > 60 * 1024)           /* XXX */
 232                         size = 60 * 1024;
 233                 /* Leave some space for rmt request/response protocol */
 234                 size += 2 * 1024;
 235                 while (size > TP_BSIZE &&
 236                     setsockopt(tormtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
 237                             size -= TP_BSIZE;
 238                 (void)setsockopt(tormtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
 239                 throughput = IPTOS_THROUGHPUT;
 240                 if (setsockopt(tormtape, IPPROTO_IP, IP_TOS,
 241                     &throughput, sizeof(throughput)) < 0)
 242                         perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
 243                 on = 1;
 244                 if (setsockopt(tormtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
 245                         perror("TCP_NODELAY setsockopt");
 246                 fromrmtape = tormtape;
 247         }
 248         (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
 249         return 1;
 250 }
 251
 252 static int
 253 okname(const char *cp0)
 254 {
 255         register const char *cp;
 256         register int c;
 257
 258         for (cp = cp0; *cp; cp++) {
 259                 c = *cp;
 260                 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
 261                         warnx("invalid user name %s\n", cp0);
 262                         return (0);
 263                 }
 264         }
 265         return (1);
 266 }
 267
 268 int
 269 rmtopen(const char *tape, int mode)
 270 {
 271         char buf[MAXPATHLEN];
 272
 273         (void)snprintf(buf, sizeof (buf), "O%s\n%d\n", tape, mode);
 274         rmtstate = TS_OPEN;
 275         return (rmtcall(tape, buf));
 276 }
 277
 278 void
 279 rmtclose(void)
 280 {
 281
 282         if (rmtstate != TS_OPEN)
 283                 return;
 284         rmtcall("close", "C\n");
 285         rmtstate = TS_CLOSED;
 286 }
 287
 288 int
 289 rmtread(char *buf, size_t count)
 290 {
 291         char line[30];
 292         int n, i;
 293         ssize_t cc;
 294
 295         (void)snprintf(line, sizeof (line), "R%u\n", (unsigned)count);
 296         n = rmtcall("read", line);
 297         if (n < 0)
 298                 /* rmtcall() properly sets errno for us on errors. */
 299                 return (n);
 300         for (i = 0; i < n; i += cc) {
 301                 cc = read(fromrmtape, buf+i, n - i);
 302                 if (cc <= 0)
 303                         rmtconnaborted(0);
 304         }
 305         return (n);
 306 }
 307
 308 int
 309 rmtwrite(const char *buf, size_t count)
 310 {
 311         char line[30];
 312
 313         (void)snprintf(line, sizeof (line), "W%d\n", count);
 314         write(tormtape, line, strlen(line));
 315         write(tormtape, buf, count);
 316         return (rmtreply("write"));
 317 }
 318
 319 int
 320 rmtseek(int offset, int pos)
 321 {
 322         char line[80];
 323
 324         (void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
 325         return (rmtcall("seek", line));
 326 }
 327
 328 struct  mtget mts;
 329
 330 struct mtget *
 331 rmtstatus(void)
 332 {
 333         register int i;
 334         register char *cp;
 335
 336         if (rmtstate != TS_OPEN)
 337                 return (NULL);
 338         rmtcall("status", "S\n");
 339         for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
 340                 *cp++ = rmtgetb();
 341         return (&mts);
 342 }
 343
 344 int
 345 rmtioctl(int cmd, int count)
 346 {
 347         char buf[256];
 348
 349         if (count < 0)
 350                 return (-1);
 351         (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
 352         return (rmtcall("ioctl", buf));
 353 }
 354
 355 static int
 356 rmtcall(const char *cmd, const char *buf)
 357 {
 358
 359         if (write(tormtape, buf, strlen(buf)) != strlen(buf))
 360                 rmtconnaborted(0);
 361         return (rmtreply(cmd));
 362 }
 363
 364 static int
 365 rmtreply(const char *cmd)
 366 {
 367         register char *cp;
 368         char code[30], emsg[BUFSIZ];
 369
 370         rmtgets(code, sizeof (code));
 371         if (*code == 'E' || *code == 'F') {
 372                 rmtgets(emsg, sizeof (emsg));
 373                 msg("%s: %s", cmd, emsg);
 374                 errno = atoi(code + 1);
 375                 if (*code == 'F')
 376                         rmtstate = TS_CLOSED;
 377                 return (-1);
 378         }
 379         if (*code != 'A') {
 380                 /* Kill trailing newline */
 381                 cp = code + strlen(code);
 382                 if (cp > code && *--cp == '\n')
 383                         *cp = '\0';
 384
 385                 msg("Protocol to remote tape server botched (code \"%s\").\n",
 386                     code);
 387                 rmtconnaborted(0);
 388         }
 389         return (atoi(code + 1));
 390 }
 391
 392 static int
 393 rmtgetb(void)
 394 {
 395         char c;
 396
 397         if (read(fromrmtape, &c, 1) != 1)
 398                 rmtconnaborted(0);
 399         return (c);
 400 }
 401
 402 /* Get a line (guaranteed to have a trailing newline). */
 403 static void
 404 rmtgets(char *line, size_t len)
 405 {
 406         register char *cp = line;
 407
 408         while (len > 1) {
 409                 *cp = rmtgetb();
 410                 if (*cp == '\n') {
 411                         cp[1] = '\0';
 412                         return;
 413                 }
 414                 cp++;
 415                 len--;
 416         }
 417         *cp = '\0';
 418         msg("Protocol to remote tape server botched.\n");
 419         msg("(rmtgets got \"%s\").\n", line);
 420         rmtconnaborted(0);
 421 }
 422
 423 int piped_child(const char **command) {
 424         int pid;
 425         int to_child_pipe[2];
 426         int from_child_pipe[2];
 427
 428         if (pipe (to_child_pipe) < 0) {
 429                 msg ("cannot create pipe: %s\n", strerror(errno));
 430                 return -1;
 431         }
 432         if (pipe (from_child_pipe) < 0) {
 433                 msg ("cannot create pipe: %s\n", strerror(errno));
 434                 return -1;
 435         }
 436         pid = fork ();
 437         if (pid < 0) {
 438                 msg ("cannot fork: %s\n", strerror(errno));
 439                 return -1;
 440         }
 441         if (pid == 0) {
 442                 if (dup2 (to_child_pipe[0], STDIN_FILENO) < 0) {
 443                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 444                         exit(1);
 445                 }
 446                 if (close (to_child_pipe[1]) < 0) {
 447                         msg ("cannot close pipe: %s\n", strerror(errno));
 448                         exit(1);
 449                 }
 450                 if (close (from_child_pipe[0]) < 0) {
 451                         msg ("cannot close pipe: %s\n", strerror(errno));
 452                         exit(1);
 453                 }
 454                 if (dup2 (from_child_pipe[1], STDOUT_FILENO) < 0) {
 455                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 456                         exit(1);
 457                 }
 458                 setpgid(0, getpid());
 459                 execvp (command[0], (char *const *) command);
 460                 msg("cannot exec %s: %s\n", command[0], strerror(errno));
 461                 exit(1);
 462         }
 463         if (close (to_child_pipe[0]) < 0) {
 464                 msg ("cannot close pipe: %s\n", strerror(errno));
 465                 return -1;
 466         }
 467         if (close (from_child_pipe[1]) < 0) {
 468                 msg ("cannot close pipe: %s\n", strerror(errno));
 469                 return -1;
 470         }
 471         tormtape = to_child_pipe[1];
 472         fromrmtape = from_child_pipe[0];
 473         return pid;
 474 }