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  * $DragonFly: src/sbin/dump/dumprmt.c,v 1.13 2005/04/14 10:17:23 y0netan1 Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/mtio.h>
  40 #include <sys/socket.h>
  41 #include <sys/time.h>
  42 #ifdef sunos
  43 #include <sys/vnode.h>
  44
  45 #include <ufs/inode.h>
  46 #else
  47 #include <vfs/ufs/dinode.h>
  48 #endif
  49
  50 #include <netinet/in.h>
  51 #include <netinet/in_systm.h>
  52 #include <netinet/ip.h>
  53 #include <netinet/tcp.h>
  54
  55 #include <protocols/dumprestore.h>
  56
  57 #include <ctype.h>
  58 #include <err.h>
  59 #include <netdb.h>
  60 #include <pwd.h>
  61 #include <stdio.h>
  62 #ifdef __STDC__
  63 #include <errno.h>
  64 #include <stdlib.h>
  65 #include <string.h>
  66 #include <unistd.h>
  67 #endif
  68
  69 #include "pathnames.h"
  70 #include "dump.h"
  71
  72 #define TS_CLOSED       0
  73 #define TS_OPEN         1
  74
  75 static  int rmtstate = TS_CLOSED;
  76 static  int rmtape;
  77 static  char *rmtpeer;
  78
  79 static  int okname(char *);
  80 static  int rmtcall(const char *, const char *);
  81 static  void rmtconnaborted(int);
  82 static  int rmtgetb(void);
  83 static  void rmtgetconn(void);
  84 static  void rmtgets(char *, int);
  85 static  int rmtreply(const char *);
  86 #ifdef KERBEROS
  87 int     krcmd(char **, int /*u_short*/, char *, char *, int *, char *);
  88 #endif
  89
  90 static  int errfd = -1;
  91
  92 int
  93 rmthost(const char *hostname)
  94 {
  95
  96         if ((rmtpeer = strdup(hostname)) == NULL)
  97                 err(1, "strdup failed");
  98         signal(SIGPIPE, rmtconnaborted);
  99         rmtgetconn();
 100         if (rmtape < 0)
 101                 return (0);
 102         return (1);
 103 }
 104
 105 static void
 106 rmtconnaborted(int signo __unused)
 107 {
 108         msg("Lost connection to remote host.\n");
 109         if (errfd != -1) {
 110                 fd_set r;
 111                 struct timeval t;
 112
 113                 FD_ZERO(&r);
 114                 FD_SET(errfd, &r);
 115                 t.tv_sec = 0;
 116                 t.tv_usec = 0;
 117                 if (select(errfd + 1, &r, NULL, NULL, &t)) {
 118                         int i;
 119                         char buf[2048];
 120
 121                         if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
 122                                 buf[i] = '\0';
 123                                 msg("on %s: %s%s", rmtpeer, buf,
 124                                         buf[i - 1] == '\n' ? "" : "\n");
 125                         }
 126                 }
 127         }
 128
 129         exit(X_ABORT);
 130 }
 131
 132 void
 133 rmtgetconn(void)
 134 {
 135         char *cp;
 136         const char *rmt;
 137         static struct servent *sp = NULL;
 138         static struct passwd *pwd = NULL;
 139         char *tuser;
 140         int size;
 141         int throughput;
 142         int on;
 143
 144         if (sp == NULL) {
 145                 sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp");
 146                 if (sp == NULL) {
 147                         msg("%s/tcp: unknown service\n",
 148                             dokerberos ? "kshell" : "shell");
 149                         exit(X_STARTUP);
 150                 }
 151                 pwd = getpwuid(getuid());
 152                 if (pwd == NULL) {
 153                         msg("who are you?\n");
 154                         exit(X_STARTUP);
 155                 }
 156         }
 157         if ((cp = strchr(rmtpeer, '@')) != NULL) {
 158                 tuser = rmtpeer;
 159                 *cp = '\0';
 160                 if (!okname(tuser))
 161                         exit(X_STARTUP);
 162                 rmtpeer = ++cp;
 163         } else
 164                 tuser = pwd->pw_name;
 165         if ((rmt = getenv("RMT")) == NULL)
 166                 rmt = _PATH_RMT;
 167         msg("%s", "");
 168 #ifdef KERBEROS
 169         if (dokerberos)
 170                 rmtape = krcmd(&rmtpeer, sp->s_port, tuser, rmt, &errfd, NULL);
 171         else
 172 #endif
 173                 rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
 174                               tuser, rmt, &errfd);
 175         if (rmtape < 0) {
 176                 msg("login to %s as %s failed.\n", rmtpeer, tuser);
 177                 return;
 178         }
 179         fprintf(stderr, "Connection to %s established.\n", rmtpeer);
 180         size = ntrec * TP_BSIZE;
 181         if (size > 60 * 1024)           /* XXX */
 182                 size = 60 * 1024;
 183         /* Leave some space for rmt request/response protocol */
 184         size += 2 * 1024;
 185         while (size > TP_BSIZE &&
 186             setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
 187                     size -= TP_BSIZE;
 188         setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
 189         throughput = IPTOS_THROUGHPUT;
 190         if (setsockopt(rmtape, IPPROTO_IP, IP_TOS,
 191             &throughput, sizeof(throughput)) < 0)
 192                 perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
 193         on = 1;
 194         if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
 195                 perror("TCP_NODELAY setsockopt");
 196 }
 197
 198 static int
 199 okname(char *cp0)
 200 {
 201         char *cp;
 202         int c;
 203
 204         for (cp = cp0; *cp; cp++) {
 205                 c = *cp;
 206                 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
 207                         msg("invalid user name %s\n", cp0);
 208                         return (0);
 209                 }
 210         }
 211         return (1);
 212 }
 213
 214 int
 215 rmtopen(const char *rtape, int mode)
 216 {
 217         char buf[256];
 218
 219         snprintf(buf, sizeof (buf), "O%.226s\n%d\n", rtape, mode);
 220         rmtstate = TS_OPEN;
 221         return (rmtcall(rtape, buf));
 222 }
 223
 224 void
 225 rmtclose(void)
 226 {
 227
 228         if (rmtstate != TS_OPEN)
 229                 return;
 230         rmtcall("close", "C\n");
 231         rmtstate = TS_CLOSED;
 232 }
 233
 234 #ifdef RRESTORE
 235 int
 236 rmtread(char *buf, int count)
 237 {
 238         char line[30];
 239         int n, i, cc;
 240
 241         snprintf(line, sizeof (line), "R%d\n", count);
 242         n = rmtcall("read", line);
 243         if (n < 0)
 244                 /* rmtcall() properly sets errno for us on errors. */
 245                 return (n);
 246         for (i = 0; i < n; i += cc) {
 247                 cc = read(rmtape, buf+i, n - i);
 248                 if (cc <= 0)
 249                         rmtconnaborted(0);
 250         }
 251         return (n);
 252 }
 253
 254 int
 255 rmtseek(int offset, int pos)
 256 {
 257         char line[80];
 258
 259         snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
 260         return (rmtcall("seek", line));
 261 }
 262
 263 int
 264 rmtioctl(int cmd, int count)
 265 {
 266         char buf[256];
 267
 268         if (count < 0)
 269                 return (-1);
 270         snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
 271         return (rmtcall("ioctl", buf));
 272 }
 273 #endif  /* RRESTORE */
 274
 275 int
 276 rmtwrite(const void *buf, int count)
 277 {
 278         char line[30];
 279
 280         snprintf(line, sizeof (line), "W%d\n", count);
 281         write(rmtape, line, strlen(line));
 282         write(rmtape, buf, count);
 283         return (rmtreply("write"));
 284 }
 285
 286 static int
 287 rmtcall(const char *cmd, const char *buf)
 288 {
 289         ssize_t len = (ssize_t)strlen(buf);
 290
 291         if (write(rmtape, buf, len) != len)
 292                 rmtconnaborted(0);
 293         return (rmtreply(cmd));
 294 }
 295
 296 static int
 297 rmtreply(const char *cmd)
 298 {
 299         char *cp;
 300         char code[30], emsg[BUFSIZ];
 301
 302         rmtgets(code, sizeof (code));
 303         if (*code == 'E' || *code == 'F') {
 304                 rmtgets(emsg, sizeof (emsg));
 305                 msg("%s: %s", cmd, emsg);
 306                 errno = atoi(code + 1);
 307                 if (*code == 'F')
 308                         rmtstate = TS_CLOSED;
 309                 return (-1);
 310         }
 311         if (*code != 'A') {
 312                 /* Kill trailing newline */
 313                 cp = code + strlen(code);
 314                 if (cp > code && *--cp == '\n')
 315                         *cp = '\0';
 316
 317                 msg("Protocol to remote tape server botched (code \"%s\").\n",
 318                     code);
 319                 rmtconnaborted(0);
 320         }
 321         return (atoi(code + 1));
 322 }
 323
 324 int
 325 rmtgetb(void)
 326 {
 327         char c;
 328
 329         if (read(rmtape, &c, 1) != 1)
 330                 rmtconnaborted(0);
 331         return (c);
 332 }
 333
 334 /* Get a line (guaranteed to have a trailing newline). */
 335 void
 336 rmtgets(char *line, int len)
 337 {
 338         char *cp = line;
 339
 340         while (len > 1) {
 341                 *cp = rmtgetb();
 342                 if (*cp == '\n') {
 343                         cp[1] = '\0';
 344                         return;
 345                 }
 346                 cp++;
 347                 len--;
 348         }
 349         *cp = '\0';
 350         msg("Protocol to remote tape server botched.\n");
 351         msg("(rmtgets got \"%s\").\n", line);
 352         rmtconnaborted(0);
 353 }