sbin/dump/dumprmt.c

   1 /*      $NetBSD: dumprmt.c,v 1.32 2006/12/18 20:07:32 christos Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1980, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)dumprmt.c   8.3 (Berkeley) 4/28/95";
  36 #else
  37 __RCSID("$NetBSD: dumprmt.c,v 1.32 2006/12/18 20:07:32 christos Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <sys/param.h>
  42 #include <sys/mtio.h>
  43 #include <sys/ioctl.h>
  44 #include <sys/socket.h>
  45 #include <sys/time.h>
  46 #include <ufs/ufs/dinode.h>
  47
  48 #include <netinet/in.h>
  49 #include <netinet/in_systm.h>
  50 #include <netinet/ip.h>
  51 #include <netinet/tcp.h>
  52
  53 #include <protocols/dumprestore.h>
  54
  55 #include <ctype.h>
  56 #include <err.h>
  57 #include <errno.h>
  58 #include <netdb.h>
  59 #include <pwd.h>
  60 #include <signal.h>
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <unistd.h>
  65
  66 #include "pathnames.h"
  67 #include "dump.h"
  68
  69 #define TS_CLOSED       0
  70 #define TS_OPEN         1
  71
  72 static  int rmtstate = TS_CLOSED;
  73 static  int rmtape;
  74 static  char *rmtpeer;
  75
  76 static  int     okname(char *);
  77 static  int     rmtcall(const char *, const char *, int);
  78 static  void    rmtconnaborted(int);
  79 static  int     rmtgetb(void);
  80 static  void    rmtgetconn(void);
  81 static  void    rmtgets(char *, int);
  82         int     rmtread(char *, int);
  83 static  int     rmtreply(const char *, int);
  84         int     rmtseek(int, int);
  85
  86 extern  int ntrec;              /* blocking factor on tape */
  87
  88 int
  89 rmthost(const char *host)
  90 {
  91
  92         if ((rmtpeer = strdup(host)) == NULL)
  93                 err(X_STARTUP, "strdup");
  94         signal(SIGPIPE, rmtconnaborted);
  95         rmtgetconn();
  96         if (rmtape < 0)
  97                 return (0);
  98         return (1);
  99 }
 100
 101 static void
 102 rmtconnaborted(int dummy __unused)
 103 {
 104
 105         errx(X_ABORT, "Lost connection to remote host.");
 106 }
 107
 108 void
 109 rmtgetconn(void)
 110 {
 111         char *cp;
 112         static struct servent *sp = NULL;
 113         static struct passwd *pwd = NULL;
 114         char *tuser, *name;
 115         int size, opt;
 116
 117         if (sp == NULL) {
 118                 sp = getservbyname("shell", "tcp");
 119                 if (sp == NULL)
 120                         errx(X_STARTUP, "shell/tcp: unknown service");
 121                 pwd = getpwuid(getuid());
 122                 if (pwd == NULL)
 123                         errx(X_STARTUP, "who are you?");
 124         }
 125         if ((name = strdup(pwd->pw_name)) == NULL)
 126                 err(X_STARTUP, "strdup");
 127         if ((cp = strchr(rmtpeer, '@')) != NULL) {
 128                 tuser = rmtpeer;
 129                 *cp = '\0';
 130                 if (!okname(tuser))
 131                         exit(X_STARTUP);
 132                 rmtpeer = ++cp;
 133         } else
 134                 tuser = name;
 135
 136         rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, name, tuser, _PATH_RMT,
 137             (int *)0);
 138         (void)free(name);
 139         if (rmtape < 0)
 140                 return;
 141
 142         size = ntrec * TP_BSIZE;
 143         if (size > 60 * 1024)           /* XXX */
 144                 size = 60 * 1024;
 145         /* Leave some space for rmt request/response protocol */
 146         size += 2 * 1024;
 147         while (size > TP_BSIZE &&
 148             setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
 149                     size -= TP_BSIZE;
 150         (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
 151
 152         opt = IPTOS_THROUGHPUT;
 153         (void)setsockopt(rmtape, IPPROTO_IP, IP_TOS, &opt, sizeof (opt));
 154
 155         opt = 1;
 156         (void)setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof (opt));
 157 }
 158
 159 static int
 160 okname(char *cp0)
 161 {
 162         char *cp;
 163         int c;
 164
 165         for (cp = cp0; *cp; cp++) {
 166                 c = *cp;
 167                 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
 168                         warnx("invalid user name: %s", cp0);
 169                         return (0);
 170                 }
 171         }
 172         return (1);
 173 }
 174
 175 int
 176 rmtopen(const char *tapedevice, int mode, int verbose)
 177 {
 178         char buf[256];
 179
 180         (void)snprintf(buf, sizeof buf, "O%s\n%d\n", tapedevice, mode);
 181         rmtstate = TS_OPEN;
 182         return (rmtcall(tapedevice, buf, verbose));
 183 }
 184
 185 void
 186 rmtclose(void)
 187 {
 188
 189         if (rmtstate != TS_OPEN)
 190                 return;
 191         rmtcall("close", "C\n", 1);
 192         rmtstate = TS_CLOSED;
 193 }
 194
 195 int
 196 rmtread(char *buf, int count)
 197 {
 198         char line[30];
 199         int n, i, cc;
 200
 201         (void)snprintf(line, sizeof line, "R%d\n", count);
 202         n = rmtcall("read", line, 1);
 203         if (n < 0) {
 204                 /* rmtcall() properly sets errno for us on errors. */
 205                 return (n);
 206         }
 207         for (i = 0; i < n; i += cc) {
 208                 cc = read(rmtape, buf+i, n - i);
 209                 if (cc <= 0) {
 210                         rmtconnaborted(0);
 211                 }
 212         }
 213         return (n);
 214 }
 215
 216 int
 217 rmtwrite(const char *buf, int count)
 218 {
 219         char line[30];
 220
 221         (void)snprintf(line, sizeof line, "W%d\n", count);
 222         write(rmtape, line, strlen(line));
 223         write(rmtape, buf, count);
 224         return (rmtreply("write", 1));
 225 }
 226
 227 #if 0           /* XXX unused? */
 228 void
 229 rmtwrite0(int count)
 230 {
 231         char line[30];
 232
 233         (void)snprintf(line, sizeof line, "W%d\n", count);
 234         write(rmtape, line, strlen(line));
 235 }
 236
 237 void
 238 rmtwrite1(char *buf, int count)
 239 {
 240
 241         write(rmtape, buf, count);
 242 }
 243
 244 int
 245 rmtwrite2(void)
 246 {
 247
 248         return (rmtreply("write", 1));
 249 }
 250 #endif
 251
 252 int
 253 rmtseek(int offset, int pos)
 254 {
 255         char line[80];
 256
 257         (void)snprintf(line, sizeof line, "L%d\n%d\n", offset, pos);
 258         return (rmtcall("seek", line, 1));
 259 }
 260
 261
 262 #if 0           /* XXX unused? */
 263 struct mtget *
 264 rmtstatus(void)
 265 {
 266         struct  mtget mts;
 267         int i;
 268         char *cp;
 269
 270         if (rmtstate != TS_OPEN)
 271                 return (NULL);
 272         rmtcall("status", "S\n", 1);
 273         for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
 274                 *cp++ = rmtgetb();
 275         return (&mts);
 276 }
 277 #endif
 278
 279 int
 280 rmtioctl(int cmd, int count)
 281 {
 282         char buf[256];
 283
 284         if (count < 0)
 285                 return (-1);
 286         (void)snprintf(buf, sizeof buf, "I%d\n%d\n", cmd, count);
 287         return (rmtcall("ioctl", buf, 1));
 288 }
 289
 290 static int
 291 rmtcall(const char *cmd, const char *buf, int verbose)
 292 {
 293
 294         if ((size_t)write(rmtape, buf, strlen(buf)) != strlen(buf))
 295                 rmtconnaborted(0);
 296         return (rmtreply(cmd, verbose));
 297 }
 298
 299 static int
 300 rmtreply(const char *cmd, int verbose)
 301 {
 302         char *cp;
 303         char code[30], emsg[BUFSIZ];
 304
 305         rmtgets(code, sizeof (code));
 306         if (*code == 'E' || *code == 'F') {
 307                 rmtgets(emsg, sizeof (emsg));
 308                 if (verbose)
 309                         msg("%s: %s", cmd, emsg);
 310                 errno = atoi(code + 1);
 311                 if (*code == 'F')
 312                         rmtstate = TS_CLOSED;
 313                 return (-1);
 314         }
 315         if (*code != 'A') {
 316                 /* Kill trailing newline */
 317                 cp = code + strlen(code);
 318                 if (cp > code && *--cp == '\n')
 319                         *cp = '\0';
 320
 321                 msg("Protocol to remote tape server botched (code \"%s\").\n",
 322                     code);
 323                 rmtconnaborted(0);
 324         }
 325         return (atoi(code + 1));
 326 }
 327
 328 int
 329 rmtgetb(void)
 330 {
 331         char c;
 332
 333         if (read(rmtape, &c, 1) != 1)
 334                 rmtconnaborted(0);
 335         return (c);
 336 }
 337
 338 /* Get a line (guaranteed to have a trailing newline). */
 339 void
 340 rmtgets(char *line, int len)
 341 {
 342         char *cp = line;
 343
 344         while (len > 1) {
 345                 *cp = rmtgetb();
 346                 if (*cp == '\n') {
 347                         cp[1] = '\0';
 348                         return;
 349                 }
 350                 cp++;
 351                 len--;
 352         }
 353         *cp = '\0';
 354         msg("Protocol to remote tape server botched.\n");
 355         msg("(rmtgets got \"%s\").\n", line);
 356         rmtconnaborted(0);
 357 }