sbin/dump/dumprmt.c

   1 /*-
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)dumprmt.c        8.3 (Berkeley) 4/28/95
  34  * $FreeBSD: src/sbin/dump/dumprmt.c,v 1.14.2.1 2000/07/01 06:31:52 ps Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/mtio.h>
  39 #include <sys/socket.h>
  40 #include <sys/time.h>
  41 #ifdef sunos
  42 #include <sys/vnode.h>
  43
  44 #include <ufs/inode.h>
  45 #else
  46 #include <vfs/ufs/dinode.h>
  47 #endif
  48
  49 #include <netinet/in.h>
  50 #include <netinet/in_systm.h>
  51 #include <netinet/ip.h>
  52 #include <netinet/tcp.h>
  53
  54 #include <protocols/dumprestore.h>
  55
  56 #include <ctype.h>
  57 #include <err.h>
  58 #include <netdb.h>
  59 #include <pwd.h>
  60 #include <stdio.h>
  61 #include <errno.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 *);
  78 static  void rmtconnaborted(int);
  79 static  int rmtgetb(void);
  80 static  void rmtgetconn(void);
  81 static  void rmtgets(char *, int);
  82 static  int rmtreply(const char *);
  83 #ifdef KERBEROS
  84 int     krcmd(char **, int /*u_short*/, char *, char *, int *, char *);
  85 #endif
  86
  87 static  int errfd = -1;
  88
  89 int
  90 rmthost(const char *hostname)
  91 {
  92
  93         if ((rmtpeer = strdup(hostname)) == NULL)
  94                 err(1, "strdup failed");
  95         signal(SIGPIPE, rmtconnaborted);
  96         rmtgetconn();
  97         if (rmtape < 0)
  98                 return (0);
  99         return (1);
 100 }
 101
 102 static void
 103 rmtconnaborted(int signo __unused)
 104 {
 105         msg("Lost connection to remote host.\n");
 106         if (errfd != -1) {
 107                 fd_set r;
 108                 struct timeval t;
 109
 110                 FD_ZERO(&r);
 111                 FD_SET(errfd, &r);
 112                 t.tv_sec = 0;
 113                 t.tv_usec = 0;
 114                 if (select(errfd + 1, &r, NULL, NULL, &t)) {
 115                         int i;
 116                         char buf[2048];
 117
 118                         if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
 119                                 buf[i] = '\0';
 120                                 msg("on %s: %s%s", rmtpeer, buf,
 121                                         buf[i - 1] == '\n' ? "" : "\n");
 122                         }
 123                 }
 124         }
 125
 126         exit(X_ABORT);
 127 }
 128
 129 void
 130 rmtgetconn(void)
 131 {
 132         char *cp;
 133         const char *rmt;
 134         static struct servent *sp = NULL;
 135         static struct passwd *pwd = NULL;
 136         char *tuser;
 137         int size;
 138         int throughput;
 139         int on;
 140
 141         if (sp == NULL) {
 142                 sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp");
 143                 if (sp == NULL) {
 144                         msg("%s/tcp: unknown service\n",
 145                             dokerberos ? "kshell" : "shell");
 146                         exit(X_STARTUP);
 147                 }
 148                 pwd = getpwuid(getuid());
 149                 if (pwd == NULL) {
 150                         msg("who are you?\n");
 151                         exit(X_STARTUP);
 152                 }
 153         }
 154         if ((cp = strchr(rmtpeer, '@')) != NULL) {
 155                 tuser = rmtpeer;
 156                 *cp = '\0';
 157                 if (!okname(tuser))
 158                         exit(X_STARTUP);
 159                 rmtpeer = ++cp;
 160         } else
 161                 tuser = pwd->pw_name;
 162         if ((rmt = getenv("RMT")) == NULL)
 163                 rmt = _PATH_RMT;
 164         msg("%s", "");
 165 #ifdef KERBEROS
 166         if (dokerberos)
 167                 rmtape = krcmd(&rmtpeer, sp->s_port, tuser, rmt, &errfd, NULL);
 168         else
 169 #endif
 170                 rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
 171                               tuser, rmt, &errfd);
 172         if (rmtape < 0) {
 173                 msg("login to %s as %s failed.\n", rmtpeer, tuser);
 174                 return;
 175         }
 176         fprintf(stderr, "Connection to %s established.\n", rmtpeer);
 177         size = ntrec * TP_BSIZE;
 178         if (size > 60 * 1024)           /* XXX */
 179                 size = 60 * 1024;
 180         /* Leave some space for rmt request/response protocol */
 181         size += 2 * 1024;
 182         while (size > TP_BSIZE &&
 183             setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
 184                     size -= TP_BSIZE;
 185         setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
 186         throughput = IPTOS_THROUGHPUT;
 187         if (setsockopt(rmtape, IPPROTO_IP, IP_TOS,
 188             &throughput, sizeof(throughput)) < 0)
 189                 perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
 190         on = 1;
 191         if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
 192                 perror("TCP_NODELAY setsockopt");
 193 }
 194
 195 static int
 196 okname(char *cp0)
 197 {
 198         char *cp;
 199         int c;
 200
 201         for (cp = cp0; *cp; cp++) {
 202                 c = *cp;
 203                 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
 204                         msg("invalid user name %s\n", cp0);
 205                         return (0);
 206                 }
 207         }
 208         return (1);
 209 }
 210
 211 int
 212 rmtopen(const char *rtape, int mode)
 213 {
 214         char buf[256];
 215
 216         snprintf(buf, sizeof (buf), "O%.226s\n%d\n", rtape, mode);
 217         rmtstate = TS_OPEN;
 218         return (rmtcall(rtape, buf));
 219 }
 220
 221 void
 222 rmtclose(void)
 223 {
 224
 225         if (rmtstate != TS_OPEN)
 226                 return;
 227         rmtcall("close", "C\n");
 228         rmtstate = TS_CLOSED;
 229 }
 230
 231 #ifdef RRESTORE
 232 int
 233 rmtread(char *buf, int count)
 234 {
 235         char line[30];
 236         int n, i, cc;
 237
 238         snprintf(line, sizeof (line), "R%d\n", count);
 239         n = rmtcall("read", line);
 240         if (n < 0)
 241                 /* rmtcall() properly sets errno for us on errors. */
 242                 return (n);
 243         for (i = 0; i < n; i += cc) {
 244                 cc = read(rmtape, buf+i, n - i);
 245                 if (cc <= 0)
 246                         rmtconnaborted(0);
 247         }
 248         return (n);
 249 }
 250
 251 int
 252 rmtseek(int offset, int pos)
 253 {
 254         char line[80];
 255
 256         snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
 257         return (rmtcall("seek", line));
 258 }
 259
 260 int
 261 rmtioctl(int cmd, int count)
 262 {
 263         char buf[256];
 264
 265         if (count < 0)
 266                 return (-1);
 267         snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
 268         return (rmtcall("ioctl", buf));
 269 }
 270 #endif  /* RRESTORE */
 271
 272 int
 273 rmtwrite(const void *buf, int count)
 274 {
 275         char line[30];
 276
 277         snprintf(line, sizeof (line), "W%d\n", count);
 278         write(rmtape, line, strlen(line));
 279         write(rmtape, buf, count);
 280         return (rmtreply("write"));
 281 }
 282
 283 static int
 284 rmtcall(const char *cmd, const char *buf)
 285 {
 286         ssize_t len = (ssize_t)strlen(buf);
 287
 288         if (write(rmtape, buf, len) != len)
 289                 rmtconnaborted(0);
 290         return (rmtreply(cmd));
 291 }
 292
 293 static int
 294 rmtreply(const char *cmd)
 295 {
 296         char *cp;
 297         char code[30], emsg[BUFSIZ];
 298
 299         rmtgets(code, sizeof (code));
 300         if (*code == 'E' || *code == 'F') {
 301                 rmtgets(emsg, sizeof (emsg));
 302                 msg("%s: %s", cmd, emsg);
 303                 errno = atoi(code + 1);
 304                 if (*code == 'F')
 305                         rmtstate = TS_CLOSED;
 306                 return (-1);
 307         }
 308         if (*code != 'A') {
 309                 /* Kill trailing newline */
 310                 cp = code + strlen(code);
 311                 if (cp > code && *--cp == '\n')
 312                         *cp = '\0';
 313
 314                 msg("Protocol to remote tape server botched (code \"%s\").\n",
 315                     code);
 316                 rmtconnaborted(0);
 317         }
 318         return (atoi(code + 1));
 319 }
 320
 321 int
 322 rmtgetb(void)
 323 {
 324         char c;
 325
 326         if (read(rmtape, &c, 1) != 1)
 327                 rmtconnaborted(0);
 328         return (c);
 329 }
 330
 331 /* Get a line (guaranteed to have a trailing newline). */
 332 void
 333 rmtgets(char *line, int len)
 334 {
 335         char *cp = line;
 336
 337         while (len > 1) {
 338                 *cp = rmtgetb();
 339                 if (*cp == '\n') {
 340                         cp[1] = '\0';
 341                         return;
 342                 }
 343                 cp++;
 344                 len--;
 345         }
 346         *cp = '\0';
 347         msg("Protocol to remote tape server botched.\n");
 348         msg("(rmtgets got \"%s\").\n", line);
 349         rmtconnaborted(0);
 350 }