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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)dumprmt.c        8.3 (Berkeley) 4/28/95
  30  * $FreeBSD: src/sbin/dump/dumprmt.c,v 1.14.2.1 2000/07/01 06:31:52 ps Exp $
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/mtio.h>
  35 #include <sys/socket.h>
  36 #include <sys/time.h>
  37 #include <vfs/ufs/dinode.h>
  38
  39 #include <netinet/in.h>
  40 #include <netinet/in_systm.h>
  41 #include <netinet/ip.h>
  42 #include <netinet/tcp.h>
  43
  44 #include <protocols/dumprestore.h>
  45
  46 #include <ctype.h>
  47 #include <err.h>
  48 #include <netdb.h>
  49 #include <pwd.h>
  50 #include <stdio.h>
  51 #include <errno.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55
  56 #include "pathnames.h"
  57 #include "dump.h"
  58
  59 #define TS_CLOSED       0
  60 #define TS_OPEN         1
  61
  62 static  int rmtstate = TS_CLOSED;
  63 static  int rmtape;
  64 static  char *rmtpeer;
  65
  66 static  int okname(char *);
  67 static  int rmtcall(const char *, const char *);
  68 static  void rmtconnaborted(int);
  69 static  int rmtgetb(void);
  70 static  void rmtgetconn(void);
  71 static  void rmtgets(char *, int);
  72 static  int rmtreply(const char *);
  73 #ifdef KERBEROS
  74 int     krcmd(char **, int /*u_short*/, char *, char *, int *, char *);
  75 #endif
  76
  77 static  int errfd = -1;
  78
  79 int
  80 rmthost(const char *hostname)
  81 {
  82
  83         if ((rmtpeer = strdup(hostname)) == NULL)
  84                 err(1, "strdup failed");
  85         signal(SIGPIPE, rmtconnaborted);
  86         rmtgetconn();
  87         if (rmtape < 0)
  88                 return (0);
  89         return (1);
  90 }
  91
  92 static void
  93 rmtconnaborted(int signo __unused)
  94 {
  95         msg("Lost connection to remote host.\n");
  96         if (errfd != -1) {
  97                 fd_set r;
  98                 struct timeval t;
  99
 100                 FD_ZERO(&r);
 101                 FD_SET(errfd, &r);
 102                 t.tv_sec = 0;
 103                 t.tv_usec = 0;
 104                 if (select(errfd + 1, &r, NULL, NULL, &t)) {
 105                         int i;
 106                         char buf[2048];
 107
 108                         if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
 109                                 buf[i] = '\0';
 110                                 msg("on %s: %s%s", rmtpeer, buf,
 111                                         buf[i - 1] == '\n' ? "" : "\n");
 112                         }
 113                 }
 114         }
 115
 116         exit(X_ABORT);
 117 }
 118
 119 void
 120 rmtgetconn(void)
 121 {
 122         char *cp;
 123         const char *rmt;
 124         static struct servent *sp = NULL;
 125         static struct passwd *pwd = NULL;
 126         char *tuser;
 127         int size;
 128         int throughput;
 129         int on;
 130
 131         if (sp == NULL) {
 132                 sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp");
 133                 if (sp == NULL) {
 134                         msg("%s/tcp: unknown service\n",
 135                             dokerberos ? "kshell" : "shell");
 136                         exit(X_STARTUP);
 137                 }
 138                 pwd = getpwuid(getuid());
 139                 if (pwd == NULL) {
 140                         msg("who are you?\n");
 141                         exit(X_STARTUP);
 142                 }
 143         }
 144         if ((cp = strchr(rmtpeer, '@')) != NULL) {
 145                 tuser = rmtpeer;
 146                 *cp = '\0';
 147                 if (!okname(tuser))
 148                         exit(X_STARTUP);
 149                 rmtpeer = ++cp;
 150         } else
 151                 tuser = pwd->pw_name;
 152         if ((rmt = getenv("RMT")) == NULL)
 153                 rmt = _PATH_RMT;
 154         msg("%s", "");
 155 #ifdef KERBEROS
 156         if (dokerberos)
 157                 rmtape = krcmd(&rmtpeer, sp->s_port, tuser, rmt, &errfd, NULL);
 158         else
 159 #endif
 160                 rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name,
 161                               tuser, rmt, &errfd);
 162         if (rmtape < 0) {
 163                 msg("login to %s as %s failed.\n", rmtpeer, tuser);
 164                 return;
 165         }
 166         fprintf(stderr, "Connection to %s established.\n", rmtpeer);
 167         size = ntrec * TP_BSIZE;
 168         if (size > 60 * 1024)           /* XXX */
 169                 size = 60 * 1024;
 170         /* Leave some space for rmt request/response protocol */
 171         size += 2 * 1024;
 172         while (size > TP_BSIZE &&
 173             setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
 174                     size -= TP_BSIZE;
 175         setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
 176         throughput = IPTOS_THROUGHPUT;
 177         if (setsockopt(rmtape, IPPROTO_IP, IP_TOS,
 178             &throughput, sizeof(throughput)) < 0)
 179                 perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
 180         on = 1;
 181         if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
 182                 perror("TCP_NODELAY setsockopt");
 183 }
 184
 185 static int
 186 okname(char *cp0)
 187 {
 188         char *cp;
 189         int c;
 190
 191         for (cp = cp0; *cp; cp++) {
 192                 c = *cp;
 193                 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
 194                         msg("invalid user name %s\n", cp0);
 195                         return (0);
 196                 }
 197         }
 198         return (1);
 199 }
 200
 201 int
 202 rmtopen(const char *rtape, int mode)
 203 {
 204         char buf[256];
 205
 206         snprintf(buf, sizeof (buf), "O%.226s\n%d\n", rtape, mode);
 207         rmtstate = TS_OPEN;
 208         return (rmtcall(rtape, buf));
 209 }
 210
 211 void
 212 rmtclose(void)
 213 {
 214
 215         if (rmtstate != TS_OPEN)
 216                 return;
 217         rmtcall("close", "C\n");
 218         rmtstate = TS_CLOSED;
 219 }
 220
 221 #ifdef RRESTORE
 222 int
 223 rmtread(char *buf, int count)
 224 {
 225         char line[30];
 226         int n, i, cc;
 227
 228         snprintf(line, sizeof (line), "R%d\n", count);
 229         n = rmtcall("read", line);
 230         if (n < 0)
 231                 /* rmtcall() properly sets errno for us on errors. */
 232                 return (n);
 233         for (i = 0; i < n; i += cc) {
 234                 cc = read(rmtape, buf+i, n - i);
 235                 if (cc <= 0)
 236                         rmtconnaborted(0);
 237         }
 238         return (n);
 239 }
 240
 241 int
 242 rmtseek(int offset, int pos)
 243 {
 244         char line[80];
 245
 246         snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
 247         return (rmtcall("seek", line));
 248 }
 249
 250 int
 251 rmtioctl(int cmd, int count)
 252 {
 253         char buf[256];
 254
 255         if (count < 0)
 256                 return (-1);
 257         snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
 258         return (rmtcall("ioctl", buf));
 259 }
 260 #endif  /* RRESTORE */
 261
 262 int
 263 rmtwrite(const void *buf, int count)
 264 {
 265         char line[30];
 266
 267         snprintf(line, sizeof (line), "W%d\n", count);
 268         write(rmtape, line, strlen(line));
 269         write(rmtape, buf, count);
 270         return (rmtreply("write"));
 271 }
 272
 273 static int
 274 rmtcall(const char *cmd, const char *buf)
 275 {
 276         ssize_t len = (ssize_t)strlen(buf);
 277
 278         if (write(rmtape, buf, len) != len)
 279                 rmtconnaborted(0);
 280         return (rmtreply(cmd));
 281 }
 282
 283 static int
 284 rmtreply(const char *cmd)
 285 {
 286         char *cp;
 287         char code[30], emsg[BUFSIZ];
 288
 289         rmtgets(code, sizeof (code));
 290         if (*code == 'E' || *code == 'F') {
 291                 rmtgets(emsg, sizeof (emsg));
 292                 msg("%s: %s", cmd, emsg);
 293                 errno = atoi(code + 1);
 294                 if (*code == 'F')
 295                         rmtstate = TS_CLOSED;
 296                 return (-1);
 297         }
 298         if (*code != 'A') {
 299                 /* Kill trailing newline */
 300                 cp = code + strlen(code);
 301                 if (cp > code && *--cp == '\n')
 302                         *cp = '\0';
 303
 304                 msg("Protocol to remote tape server botched (code \"%s\").\n",
 305                     code);
 306                 rmtconnaborted(0);
 307         }
 308         return (atoi(code + 1));
 309 }
 310
 311 int
 312 rmtgetb(void)
 313 {
 314         char c;
 315
 316         if (read(rmtape, &c, 1) != 1)
 317                 rmtconnaborted(0);
 318         return (c);
 319 }
 320
 321 /* Get a line (guaranteed to have a trailing newline). */
 322 void
 323 rmtgets(char *line, int len)
 324 {
 325         char *cp = line;
 326
 327         while (len > 1) {
 328                 *cp = rmtgetb();
 329                 if (*cp == '\n') {
 330                         cp[1] = '\0';
 331                         return;
 332                 }
 333                 cp++;
 334                 len--;
 335         }
 336         *cp = '\0';
 337         msg("Protocol to remote tape server botched.\n");
 338         msg("(rmtgets got \"%s\").\n", line);
 339         rmtconnaborted(0);
 340 }