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 1.6 1999/10/13 09:57:18 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 rmtape = -1;
  99 static  const char *rmtpeer = 0;
 100
 101 static  int okname __P((const char *));
 102 static  int rmtcall __P((const char *, const char *));
 103 static  void rmtconnaborted __P((int));
 104 static  int rmtgetb __P((void));
 105 static  void rmtgetconn __P((void));
 106 static  void rmtgets __P((char *, size_t));
 107 static  int rmtreply __P((const char *));
 108 #ifdef KERBEROS
 109 int     krcmd __P((char **, int /*u_short*/, char *, char *, int *, char *));
 110 #endif
 111
 112 static  int errfd = -1;
 113 extern  int dokerberos;
 114 extern  int ntrec;              /* blocking factor on tape */
 115 #ifndef errno
 116 extern  int errno;
 117 #endif
 118
 119 int
 120 rmthost(const char *host)
 121 {
 122         if (rmtpeer)
 123                 free((void *)rmtpeer);
 124         if ((rmtpeer = strdup(host)) == NULL)
 125                 rmtpeer = host;
 126         signal(SIGPIPE, rmtconnaborted);
 127         rmtgetconn();
 128         if (rmtape < 0)
 129                 return (0);
 130         return (1);
 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 void
 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         int size;
 169         int throughput;
 170         int on;
 171
 172         if (sp == NULL) {
 173                 sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp");
 174                 if (sp == NULL)
 175                         errx(1, "%s/tcp: unknown service",
 176                             dokerberos ? "kshell" : "shell");
 177                 pwd = getpwuid(getuid());
 178                 if (pwd == NULL)
 179                         errx(1, "who are you?");
 180         }
 181         if ((cp = strchr(rmtpeer, '@')) != NULL) {
 182                 tuser = rmtpeer;
 183                 *cp = '\0';
 184                 if (!okname(tuser))
 185                         exit(X_STARTUP);
 186                 rmtpeer = ++cp;
 187         } else
 188                 tuser = pwd->pw_name;
 189         if ((rmt = getenv("RMT")) == NULL)
 190                 rmt = _PATH_RMT;
 191         msg("");
 192 #ifdef KERBEROS
 193         if (dokerberos)
 194                 rmtape = krcmd((char **)&rmtpeer, sp->s_port, tuser, rmt, &errfd,
 195                                (char *)0);
 196         else
 197 #endif
 198                 rmtape = rcmd((char **)&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
 199                               tuser, rmt, &errfd);
 200         if (rmtape < 0) {
 201                 msg("login to %s as %s failed.\n", rmtpeer, tuser);
 202                 return;
 203         }
 204         (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
 205         size = ntrec * TP_BSIZE;
 206         if (size > 60 * 1024)           /* XXX */
 207                 size = 60 * 1024;
 208         /* Leave some space for rmt request/response protocol */
 209         size += 2 * 1024;
 210         while (size > TP_BSIZE &&
 211             setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
 212                     size -= TP_BSIZE;
 213         (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
 214         throughput = IPTOS_THROUGHPUT;
 215         if (setsockopt(rmtape, IPPROTO_IP, IP_TOS,
 216             &throughput, sizeof(throughput)) < 0)
 217                 perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
 218         on = 1;
 219         if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
 220                 perror("TCP_NODELAY setsockopt");
 221 }
 222
 223 static int
 224 okname(const char *cp0)
 225 {
 226         register const char *cp;
 227         register int c;
 228
 229         for (cp = cp0; *cp; cp++) {
 230                 c = *cp;
 231                 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
 232                         warnx("invalid user name %s\n", cp0);
 233                         return (0);
 234                 }
 235         }
 236         return (1);
 237 }
 238
 239 int
 240 rmtopen(const char *tape, int mode)
 241 {
 242         char buf[MAXPATHLEN];
 243
 244         (void)snprintf(buf, sizeof (buf), "O%s\n%d\n", tape, mode);
 245         rmtstate = TS_OPEN;
 246         return (rmtcall(tape, buf));
 247 }
 248
 249 void
 250 rmtclose(void)
 251 {
 252
 253         if (rmtstate != TS_OPEN)
 254                 return;
 255         rmtcall("close", "C\n");
 256         rmtstate = TS_CLOSED;
 257 }
 258
 259 int
 260 rmtread(char *buf, size_t count)
 261 {
 262         char line[30];
 263         int n, i;
 264         ssize_t cc;
 265
 266         (void)snprintf(line, sizeof (line), "R%u\n", (unsigned)count);
 267         n = rmtcall("read", line);
 268         if (n < 0)
 269                 /* rmtcall() properly sets errno for us on errors. */
 270                 return (n);
 271         for (i = 0; i < n; i += cc) {
 272                 cc = read(rmtape, buf+i, n - i);
 273                 if (cc <= 0)
 274                         rmtconnaborted(0);
 275         }
 276         return (n);
 277 }
 278
 279 int
 280 rmtwrite(const char *buf, size_t count)
 281 {
 282         char line[30];
 283
 284         (void)snprintf(line, sizeof (line), "W%d\n", count);
 285         write(rmtape, line, strlen(line));
 286         write(rmtape, buf, count);
 287         return (rmtreply("write"));
 288 }
 289
 290 int
 291 rmtseek(int offset, int pos)
 292 {
 293         char line[80];
 294
 295         (void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
 296         return (rmtcall("seek", line));
 297 }
 298
 299 struct  mtget mts;
 300
 301 struct mtget *
 302 rmtstatus(void)
 303 {
 304         register int i;
 305         register char *cp;
 306
 307         if (rmtstate != TS_OPEN)
 308                 return (NULL);
 309         rmtcall("status", "S\n");
 310         for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
 311                 *cp++ = rmtgetb();
 312         return (&mts);
 313 }
 314
 315 int
 316 rmtioctl(int cmd, int count)
 317 {
 318         char buf[256];
 319
 320         if (count < 0)
 321                 return (-1);
 322         (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
 323         return (rmtcall("ioctl", buf));
 324 }
 325
 326 static int
 327 rmtcall(const char *cmd, const char *buf)
 328 {
 329
 330         if (write(rmtape, buf, strlen(buf)) != strlen(buf))
 331                 rmtconnaborted(0);
 332         return (rmtreply(cmd));
 333 }
 334
 335 static int
 336 rmtreply(const char *cmd)
 337 {
 338         register char *cp;
 339         char code[30], emsg[BUFSIZ];
 340
 341         rmtgets(code, sizeof (code));
 342         if (*code == 'E' || *code == 'F') {
 343                 rmtgets(emsg, sizeof (emsg));
 344                 msg("%s: %s", cmd, emsg);
 345                 errno = atoi(code + 1);
 346                 if (*code == 'F')
 347                         rmtstate = TS_CLOSED;
 348                 return (-1);
 349         }
 350         if (*code != 'A') {
 351                 /* Kill trailing newline */
 352                 cp = code + strlen(code);
 353                 if (cp > code && *--cp == '\n')
 354                         *cp = '\0';
 355
 356                 msg("Protocol to remote tape server botched (code \"%s\").\n",
 357                     code);
 358                 rmtconnaborted(0);
 359         }
 360         return (atoi(code + 1));
 361 }
 362
 363 static int
 364 rmtgetb(void)
 365 {
 366         char c;
 367
 368         if (read(rmtape, &c, 1) != 1)
 369                 rmtconnaborted(0);
 370         return (c);
 371 }
 372
 373 /* Get a line (guaranteed to have a trailing newline). */
 374 static void
 375 rmtgets(char *line, size_t len)
 376 {
 377         register char *cp = line;
 378
 379         while (len > 1) {
 380                 *cp = rmtgetb();
 381                 if (*cp == '\n') {
 382                         cp[1] = '\0';
 383                         return;
 384                 }
 385                 cp++;
 386                 len--;
 387         }
 388         *cp = '\0';
 389         msg("Protocol to remote tape server botched.\n");
 390         msg("(rmtgets got \"%s\").\n", line);
 391         rmtconnaborted(0);
 392 }