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  * $Id: dumprmt.c,v 1.5 1999/10/11 13:31:08 stelian Exp $
   8  */
   9
  10 /*-
  11  * Copyright (c) 1980, 1993
  12  *      The Regents of the University of California.  All rights reserved.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  * 3. All advertising materials mentioning features or use of this software
  23  *    must display the following acknowledgement:
  24  *      This product includes software developed by the University of
  25  *      California, Berkeley and its contributors.
  26  * 4. Neither the name of the University nor the names of its contributors
  27  *    may be used to endorse or promote products derived from this software
  28  *    without specific prior written permission.
  29  *
  30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  40  * SUCH DAMAGE.
  41  */
  42
  43 #ifndef lint
  44 #if 0
  45 static char sccsid[] = "@(#)dumprmt.c   8.3 (Berkeley) 4/28/95";
  46 #endif
  47 static const char rcsid[] =
  48         "$Id: dumprmt.c,v 1.5 1999/10/11 13:31:08 stelian Exp $";
  49 #endif /* not lint */
  50
  51 #ifdef __linux__
  52 #include <sys/types.h>
  53 #include <linux/types.h>
  54 #endif
  55 #include <sys/param.h>
  56 #include <sys/mtio.h>
  57 #include <sys/socket.h>
  58 #include <sys/time.h>
  59 #ifdef __linux__
  60 #include <linux/ext2_fs.h>
  61 #include <bsdcompat.h>
  62 #include <signal.h>
  63 #else
  64 #ifdef sunos
  65 #include <sys/vnode.h>
  66
  67 #include <ufs/inode.h>
  68 #else
  69 #include <ufs/ufs/dinode.h>
  70 #endif
  71 #endif
  72
  73 #include <netinet/in.h>
  74 #include <netinet/in_systm.h>
  75 #include <netinet/ip.h>
  76 #include <netinet/tcp.h>
  77
  78 #include <protocols/dumprestore.h>
  79
  80 #include <ctype.h>
  81 #include <errno.h>
  82 #include <compaterr.h>
  83 #include <netdb.h>
  84 #include <pwd.h>
  85 #include <stdio.h>
  86 #ifdef __STDC__
  87 #include <stdlib.h>
  88 #include <string.h>
  89 #include <unistd.h>
  90 #endif
  91
  92 #ifdef  __linux__
  93 #include <ext2fs/ext2fs.h>
  94 #endif
  95
  96 #include "pathnames.h"
  97 #include "dump.h"
  98
  99 #define TS_CLOSED       0
 100 #define TS_OPEN         1
 101
 102 static  int rmtstate = TS_CLOSED;
 103 static  int rmtape = -1;
 104 static  const char *rmtpeer = 0;
 105
 106 static  int okname __P((const char *));
 107 static  int rmtcall __P((const char *, const char *));
 108 static  void rmtconnaborted __P((int));
 109 static  int rmtgetb __P((void));
 110 static  void rmtgetconn __P((void));
 111 static  void rmtgets __P((char *, size_t));
 112 static  int rmtreply __P((const char *));
 113 #ifdef KERBEROS
 114 int     krcmd __P((char **, int /*u_short*/, char *, char *, int *, char *));
 115 #endif
 116
 117 static  int errfd = -1;
 118 extern  int dokerberos;
 119 extern  int ntrec;              /* blocking factor on tape */
 120 #ifndef errno
 121 extern  int errno;
 122 #endif
 123
 124 int
 125 rmthost(const char *host)
 126 {
 127         if (rmtpeer)
 128                 free((void *)rmtpeer);
 129         if ((rmtpeer = strdup(host)) == NULL)
 130                 rmtpeer = host;
 131         signal(SIGPIPE, rmtconnaborted);
 132         rmtgetconn();
 133         if (rmtape < 0)
 134                 return (0);
 135         return (1);
 136 }
 137
 138 static void
 139 rmtconnaborted(int signo)
 140 {
 141         msg("Lost connection to remote host.\n");
 142         if (errfd != -1) {
 143                 fd_set r;
 144                 struct timeval t;
 145
 146                 FD_ZERO(&r);
 147                 FD_SET(errfd, &r);
 148                 t.tv_sec = 0;
 149                 t.tv_usec = 0;
 150                 if (select(errfd + 1, &r, NULL, NULL, &t)) {
 151                         int i;
 152                         char buf[2048];
 153
 154                         if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
 155                                 buf[i] = '\0';
 156                                 msg("on %s: %s%s", rmtpeer, buf,
 157                                         buf[i - 1] == '\n' ? "" : "\n");
 158                         }
 159                 }
 160         }
 161
 162         exit(X_ABORT);
 163 }
 164
 165 static void
 166 rmtgetconn(void)
 167 {
 168         register char *cp;
 169         register const char *rmt;
 170         static struct servent *sp = NULL;
 171         static struct passwd *pwd = NULL;
 172         const char *tuser;
 173         int size;
 174         int throughput;
 175         int on;
 176
 177         if (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                 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 #ifdef KERBEROS
 198         if (dokerberos)
 199                 rmtape = krcmd((char **)&rmtpeer, sp->s_port, tuser, rmt, &errfd,
 200                                (char *)0);
 201         else
 202 #endif
 203                 rmtape = rcmd((char **)&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
 204                               tuser, rmt, &errfd);
 205         if (rmtape < 0) {
 206                 msg("login to %s as %s failed.\n", rmtpeer, tuser);
 207                 return;
 208         }
 209         (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
 210         size = ntrec * TP_BSIZE;
 211         if (size > 60 * 1024)           /* XXX */
 212                 size = 60 * 1024;
 213         /* Leave some space for rmt request/response protocol */
 214         size += 2 * 1024;
 215         while (size > TP_BSIZE &&
 216             setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
 217                     size -= TP_BSIZE;
 218         (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
 219         throughput = IPTOS_THROUGHPUT;
 220         if (setsockopt(rmtape, IPPROTO_IP, IP_TOS,
 221             &throughput, sizeof(throughput)) < 0)
 222                 perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
 223         on = 1;
 224         if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
 225                 perror("TCP_NODELAY setsockopt");
 226 }
 227
 228 static int
 229 okname(const char *cp0)
 230 {
 231         register const char *cp;
 232         register int c;
 233
 234         for (cp = cp0; *cp; cp++) {
 235                 c = *cp;
 236                 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
 237                         warnx("invalid user name %s\n", cp0);
 238                         return (0);
 239                 }
 240         }
 241         return (1);
 242 }
 243
 244 int
 245 rmtopen(const char *tape, int mode)
 246 {
 247         char buf[MAXPATHLEN];
 248
 249         (void)snprintf(buf, sizeof (buf), "O%s\n%d\n", tape, mode);
 250         rmtstate = TS_OPEN;
 251         return (rmtcall(tape, buf));
 252 }
 253
 254 void
 255 rmtclose(void)
 256 {
 257
 258         if (rmtstate != TS_OPEN)
 259                 return;
 260         rmtcall("close", "C\n");
 261         rmtstate = TS_CLOSED;
 262 }
 263
 264 int
 265 rmtread(char *buf, size_t count)
 266 {
 267         char line[30];
 268         int n, i;
 269         ssize_t cc;
 270
 271         (void)snprintf(line, sizeof (line), "R%u\n", (unsigned)count);
 272         n = rmtcall("read", line);
 273         if (n < 0)
 274                 /* rmtcall() properly sets errno for us on errors. */
 275                 return (n);
 276         for (i = 0; i < n; i += cc) {
 277                 cc = read(rmtape, buf+i, n - i);
 278                 if (cc <= 0)
 279                         rmtconnaborted(0);
 280         }
 281         return (n);
 282 }
 283
 284 int
 285 rmtwrite(const char *buf, size_t count)
 286 {
 287         char line[30];
 288
 289         (void)snprintf(line, sizeof (line), "W%d\n", count);
 290         write(rmtape, line, strlen(line));
 291         write(rmtape, buf, count);
 292         return (rmtreply("write"));
 293 }
 294
 295 int
 296 rmtseek(int offset, int pos)
 297 {
 298         char line[80];
 299
 300         (void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
 301         return (rmtcall("seek", line));
 302 }
 303
 304 struct  mtget mts;
 305
 306 struct mtget *
 307 rmtstatus(void)
 308 {
 309         register int i;
 310         register char *cp;
 311
 312         if (rmtstate != TS_OPEN)
 313                 return (NULL);
 314         rmtcall("status", "S\n");
 315         for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
 316                 *cp++ = rmtgetb();
 317         return (&mts);
 318 }
 319
 320 int
 321 rmtioctl(int cmd, int count)
 322 {
 323         char buf[256];
 324
 325         if (count < 0)
 326                 return (-1);
 327         (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
 328         return (rmtcall("ioctl", buf));
 329 }
 330
 331 static int
 332 rmtcall(const char *cmd, const char *buf)
 333 {
 334
 335         if (write(rmtape, buf, strlen(buf)) != strlen(buf))
 336                 rmtconnaborted(0);
 337         return (rmtreply(cmd));
 338 }
 339
 340 static int
 341 rmtreply(const char *cmd)
 342 {
 343         register char *cp;
 344         char code[30], emsg[BUFSIZ];
 345
 346         rmtgets(code, sizeof (code));
 347         if (*code == 'E' || *code == 'F') {
 348                 rmtgets(emsg, sizeof (emsg));
 349                 msg("%s: %s", cmd, emsg);
 350                 errno = atoi(code + 1);
 351                 if (*code == 'F')
 352                         rmtstate = TS_CLOSED;
 353                 return (-1);
 354         }
 355         if (*code != 'A') {
 356                 /* Kill trailing newline */
 357                 cp = code + strlen(code);
 358                 if (cp > code && *--cp == '\n')
 359                         *cp = '\0';
 360
 361                 msg("Protocol to remote tape server botched (code \"%s\").\n",
 362                     code);
 363                 rmtconnaborted(0);
 364         }
 365         return (atoi(code + 1));
 366 }
 367
 368 static int
 369 rmtgetb(void)
 370 {
 371         char c;
 372
 373         if (read(rmtape, &c, 1) != 1)
 374                 rmtconnaborted(0);
 375         return (c);
 376 }
 377
 378 /* Get a line (guaranteed to have a trailing newline). */
 379 static void
 380 rmtgets(char *line, size_t len)
 381 {
 382         register char *cp = line;
 383
 384         while (len > 1) {
 385                 *cp = rmtgetb();
 386                 if (*cp == '\n') {
 387                         cp[1] = '\0';
 388                         return;
 389                 }
 390                 cp++;
 391                 len--;
 392         }
 393         *cp = '\0';
 394         msg("Protocol to remote tape server botched.\n");
 395         msg("(rmtgets got \"%s\").\n", line);
 396         rmtconnaborted(0);
 397 }