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 1.12 2000/11/03 18:28:58 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                 /* Restore the uid and gid. We really don't want
 209                  * to execute whatever is put into RSH variable with
 210                  * more priviledges than needed... */
 211                 setuid(getuid());
 212                 setgid(getgid());
 213
 214                 if ((rshpid = piped_child(rshcmd)) < 0) {
 215                         msg("cannot open connection\n");
 216                         return 0;
 217                 }
 218         }
 219         else {
 220                 /* Copy rmtpeer to rmtpeercopy to ignore the
 221                    return value from rcmd. I cannot figure if
 222                    this is this a bug in rcmd or in my code... */
 223                 rmtpeercopy = (char *)rmtpeer;
 224 #ifdef KERBEROS
 225                 if (dokerberos)
 226                         tormtape = krcmd(&rmtpeercopy, sp->s_port, tuser, rmt, &errfd,
 227                                        (char *)0);
 228                 else
 229 #endif
 230                         tormtape = rcmd(&rmtpeercopy, (u_short)sp->s_port, pwd->pw_name,
 231                                       tuser, rmt, &errfd);
 232                 if (tormtape < 0) {
 233                         msg("login to %s as %s failed.\n", rmtpeer, tuser);
 234                         return 0;
 235                 }
 236                 size = ntrec * TP_BSIZE;
 237                 if (size > 60 * 1024)           /* XXX */
 238                         size = 60 * 1024;
 239                 /* Leave some space for rmt request/response protocol */
 240                 size += 2 * 1024;
 241                 while (size > TP_BSIZE &&
 242                     setsockopt(tormtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
 243                             size -= TP_BSIZE;
 244                 (void)setsockopt(tormtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
 245                 throughput = IPTOS_THROUGHPUT;
 246                 if (setsockopt(tormtape, IPPROTO_IP, IP_TOS,
 247                     &throughput, sizeof(throughput)) < 0)
 248                         perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
 249                 on = 1;
 250                 if (setsockopt(tormtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
 251                         perror("TCP_NODELAY setsockopt");
 252                 fromrmtape = tormtape;
 253         }
 254         (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
 255         return 1;
 256 }
 257
 258 static int
 259 okname(const char *cp0)
 260 {
 261         register const char *cp;
 262         register int c;
 263
 264         for (cp = cp0; *cp; cp++) {
 265                 c = *cp;
 266                 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
 267                         warnx("invalid user name %s\n", cp0);
 268                         return (0);
 269                 }
 270         }
 271         return (1);
 272 }
 273
 274 int
 275 rmtopen(const char *tape, int mode)
 276 {
 277         char buf[MAXPATHLEN];
 278
 279         (void)snprintf(buf, sizeof (buf), "O%s\n%d\n", tape, mode);
 280         rmtstate = TS_OPEN;
 281         return (rmtcall(tape, buf));
 282 }
 283
 284 void
 285 rmtclose(void)
 286 {
 287
 288         if (rmtstate != TS_OPEN)
 289                 return;
 290         rmtcall("close", "C\n");
 291         rmtstate = TS_CLOSED;
 292 }
 293
 294 int
 295 rmtread(char *buf, size_t count)
 296 {
 297         char line[30];
 298         int n, i;
 299         ssize_t cc;
 300
 301         (void)snprintf(line, sizeof (line), "R%u\n", (unsigned)count);
 302         n = rmtcall("read", line);
 303         if (n < 0)
 304                 /* rmtcall() properly sets errno for us on errors. */
 305                 return (n);
 306         for (i = 0; i < n; i += cc) {
 307                 cc = read(fromrmtape, buf+i, n - i);
 308                 if (cc <= 0)
 309                         rmtconnaborted(0);
 310         }
 311         return (n);
 312 }
 313
 314 int
 315 rmtwrite(const char *buf, size_t count)
 316 {
 317         char line[30];
 318
 319         (void)snprintf(line, sizeof (line), "W%d\n", count);
 320         write(tormtape, line, strlen(line));
 321         write(tormtape, buf, count);
 322         return (rmtreply("write"));
 323 }
 324
 325 int
 326 rmtseek(int offset, int pos)
 327 {
 328         char line[80];
 329
 330         (void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
 331         return (rmtcall("seek", line));
 332 }
 333
 334 struct  mtget mts;
 335
 336 struct mtget *
 337 rmtstatus(void)
 338 {
 339         register int i;
 340         register char *cp;
 341
 342         if (rmtstate != TS_OPEN)
 343                 return (NULL);
 344         rmtcall("status", "S\n");
 345         for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
 346                 *cp++ = rmtgetb();
 347         return (&mts);
 348 }
 349
 350 int
 351 rmtioctl(int cmd, int count)
 352 {
 353         char buf[256];
 354
 355         if (count < 0)
 356                 return (-1);
 357         (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
 358         return (rmtcall("ioctl", buf));
 359 }
 360
 361 static int
 362 rmtcall(const char *cmd, const char *buf)
 363 {
 364
 365         if (write(tormtape, buf, strlen(buf)) != strlen(buf))
 366                 rmtconnaborted(0);
 367         return (rmtreply(cmd));
 368 }
 369
 370 static int
 371 rmtreply(const char *cmd)
 372 {
 373         register char *cp;
 374         char code[30], emsg[BUFSIZ];
 375
 376         rmtgets(code, sizeof (code));
 377         if (*code == 'E' || *code == 'F') {
 378                 rmtgets(emsg, sizeof (emsg));
 379                 msg("%s: %s", cmd, emsg);
 380                 errno = atoi(code + 1);
 381                 if (*code == 'F')
 382                         rmtstate = TS_CLOSED;
 383                 return (-1);
 384         }
 385         if (*code != 'A') {
 386                 /* Kill trailing newline */
 387                 cp = code + strlen(code);
 388                 if (cp > code && *--cp == '\n')
 389                         *cp = '\0';
 390
 391                 msg("Protocol to remote tape server botched (code \"%s\").\n",
 392                     code);
 393                 rmtconnaborted(0);
 394         }
 395         return (atoi(code + 1));
 396 }
 397
 398 static int
 399 rmtgetb(void)
 400 {
 401         char c;
 402
 403         if (read(fromrmtape, &c, 1) != 1)
 404                 rmtconnaborted(0);
 405         return (c);
 406 }
 407
 408 /* Get a line (guaranteed to have a trailing newline). */
 409 static void
 410 rmtgets(char *line, size_t len)
 411 {
 412         register char *cp = line;
 413
 414         while (len > 1) {
 415                 *cp = rmtgetb();
 416                 if (*cp == '\n') {
 417                         cp[1] = '\0';
 418                         return;
 419                 }
 420                 cp++;
 421                 len--;
 422         }
 423         *cp = '\0';
 424         msg("Protocol to remote tape server botched.\n");
 425         msg("(rmtgets got \"%s\").\n", line);
 426         rmtconnaborted(0);
 427 }
 428
 429 int piped_child(const char **command) {
 430         int pid;
 431         int to_child_pipe[2];
 432         int from_child_pipe[2];
 433
 434         if (pipe (to_child_pipe) < 0) {
 435                 msg ("cannot create pipe: %s\n", strerror(errno));
 436                 return -1;
 437         }
 438         if (pipe (from_child_pipe) < 0) {
 439                 msg ("cannot create pipe: %s\n", strerror(errno));
 440                 return -1;
 441         }
 442         pid = fork ();
 443         if (pid < 0) {
 444                 msg ("cannot fork: %s\n", strerror(errno));
 445                 return -1;
 446         }
 447         if (pid == 0) {
 448                 if (dup2 (to_child_pipe[0], STDIN_FILENO) < 0) {
 449                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 450                         exit(1);
 451                 }
 452                 if (close (to_child_pipe[1]) < 0) {
 453                         msg ("cannot close pipe: %s\n", strerror(errno));
 454                         exit(1);
 455                 }
 456                 if (close (from_child_pipe[0]) < 0) {
 457                         msg ("cannot close pipe: %s\n", strerror(errno));
 458                         exit(1);
 459                 }
 460                 if (dup2 (from_child_pipe[1], STDOUT_FILENO) < 0) {
 461                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 462                         exit(1);
 463                 }
 464                 setpgid(0, getpid());
 465                 execvp (command[0], (char *const *) command);
 466                 msg("cannot exec %s: %s\n", command[0], strerror(errno));
 467                 exit(1);
 468         }
 469         if (close (to_child_pipe[0]) < 0) {
 470                 msg ("cannot close pipe: %s\n", strerror(errno));
 471                 return -1;
 472         }
 473         if (close (from_child_pipe[1]) < 0) {
 474                 msg ("cannot close pipe: %s\n", strerror(errno));
 475                 return -1;
 476         }
 477         tormtape = to_child_pipe[1];
 478         fromrmtape = from_child_pipe[0];
 479         return pid;
 480 }