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 34 #ifndef lint 35 #if 0 36 static char sccsid[] = "@(#)dumprmt.c 8.3 (Berkeley) 4/28/95"; 37 #endif 38 static const char rcsid[] = 39 "$FreeBSD$"; 40 #endif /* not lint */ 41 42 #include <sys/param.h> 43 #include <sys/mtio.h> 44 #include <sys/socket.h> 45 #include <sys/time.h> 46 47 #include <ufs/ufs/dinode.h> 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 <netdb.h> 58 #include <pwd.h> 59 #include <stdio.h> 60 #include <limits.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(const 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 84 static int errfd = -1; 85 extern int ntrec; /* blocking factor on tape */ 86 87 int 88 rmthost(const char *host) 89 { 90 91 rmtpeer = strdup(host); 92 if (rmtpeer == NULL) 93 return (0); 94 signal(SIGPIPE, rmtconnaborted); 95 rmtgetconn(); 96 if (rmtape < 0) 97 return (0); 98 return (1); 99 } 100 101 static void 102 rmtconnaborted(int sig __unused) 103 { 104 msg("Lost connection to remote host.\n"); 105 if (errfd != -1) { 106 fd_set r; 107 struct timeval t; 108 109 FD_ZERO(&r); 110 FD_SET(errfd, &r); 111 t.tv_sec = 0; 112 t.tv_usec = 0; 113 if (select(errfd + 1, &r, NULL, NULL, &t)) { 114 int i; 115 char buf[2048]; 116 117 if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) { 118 buf[i] = '\0'; 119 msg("on %s: %s%s", rmtpeer, buf, 120 buf[i - 1] == '\n' ? "" : "\n"); 121 } 122 } 123 } 124 125 exit(X_ABORT); 126 } 127 128 void 129 rmtgetconn(void) 130 { 131 char *cp; 132 const char *rmt; 133 static struct servent *sp = NULL; 134 static struct passwd *pwd = NULL; 135 char *tuser; 136 int size; 137 int throughput; 138 int on; 139 140 if (sp == NULL) { 141 sp = getservbyname("shell", "tcp"); 142 if (sp == NULL) { 143 msg("shell/tcp: unknown service\n"); 144 exit(X_STARTUP); 145 } 146 pwd = getpwuid(getuid()); 147 if (pwd == NULL) { 148 msg("who are you?\n"); 149 exit(X_STARTUP); 150 } 151 } 152 if ((cp = strchr(rmtpeer, '@')) != NULL) { 153 tuser = rmtpeer; 154 *cp = '\0'; 155 if (!okname(tuser)) 156 exit(X_STARTUP); 157 rmtpeer = ++cp; 158 } else 159 tuser = pwd->pw_name; 160 if ((rmt = getenv("RMT")) == NULL) 161 rmt = _PATH_RMT; 162 msg(""); 163 rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name, 164 tuser, rmt, &errfd); 165 if (rmtape < 0) { 166 msg("login to %s as %s failed.\n", rmtpeer, tuser); 167 return; 168 } 169 (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer); 170 size = ntrec * TP_BSIZE; 171 if (size > 60 * 1024) /* XXX */ 172 size = 60 * 1024; 173 /* Leave some space for rmt request/response protocol */ 174 size += 2 * 1024; 175 while (size > TP_BSIZE && 176 setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0) 177 size -= TP_BSIZE; 178 (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)); 179 throughput = IPTOS_THROUGHPUT; 180 if (setsockopt(rmtape, IPPROTO_IP, IP_TOS, 181 &throughput, sizeof(throughput)) < 0) 182 perror("IP_TOS:IPTOS_THROUGHPUT setsockopt"); 183 on = 1; 184 if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0) 185 perror("TCP_NODELAY setsockopt"); 186 } 187 188 static int 189 okname(const char *cp0) 190 { 191 const char *cp; 192 int c; 193 194 for (cp = cp0; *cp; cp++) { 195 c = *cp; 196 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) { 197 msg("invalid user name %s\n", cp0); 198 return (0); 199 } 200 } 201 return (1); 202 } 203 204 int 205 rmtopen(const char *tape, int mode) 206 { 207 char buf[256]; 208 209 (void)snprintf(buf, sizeof (buf), "O%.226s\n%d\n", tape, mode); 210 rmtstate = TS_OPEN; 211 return (rmtcall(tape, buf)); 212 } 213 214 void 215 rmtclose(void) 216 { 217 218 if (rmtstate != TS_OPEN) 219 return; 220 rmtcall("close", "C\n"); 221 rmtstate = TS_CLOSED; 222 } 223 224 int 225 rmtread(char *buf, int count) 226 { 227 char line[30]; 228 int n, i, cc; 229 230 (void)snprintf(line, sizeof (line), "R%d\n", count); 231 n = rmtcall("read", line); 232 if (n < 0) 233 /* rmtcall() properly sets errno for us on errors. */ 234 return (n); 235 for (i = 0; i < n; i += cc) { 236 cc = read(rmtape, buf+i, n - i); 237 if (cc <= 0) 238 rmtconnaborted(0); 239 } 240 return (n); 241 } 242 243 int 244 rmtwrite(const char *buf, int count) 245 { 246 char line[30]; 247 248 (void)snprintf(line, sizeof (line), "W%d\n", count); 249 write(rmtape, line, strlen(line)); 250 write(rmtape, buf, count); 251 return (rmtreply("write")); 252 } 253 254 void 255 rmtwrite0(int count) 256 { 257 char line[30]; 258 259 (void)snprintf(line, sizeof (line), "W%d\n", count); 260 write(rmtape, line, strlen(line)); 261 } 262 263 void 264 rmtwrite1(const char *buf, int count) 265 { 266 267 write(rmtape, buf, count); 268 } 269 270 int 271 rmtwrite2(void) 272 { 273 274 return (rmtreply("write")); 275 } 276 277 int 278 rmtseek(int offset, int pos) /* XXX off_t ? */ 279 { 280 char line[80]; 281 282 (void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos); 283 return (rmtcall("seek", line)); 284 } 285 286 struct mtget mts; 287 288 struct mtget * 289 rmtstatus(void) 290 { 291 int i; 292 char *cp; 293 294 if (rmtstate != TS_OPEN) 295 return (NULL); 296 rmtcall("status", "S\n"); 297 for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++) 298 *cp++ = rmtgetb(); 299 return (&mts); 300 } 301 302 int 303 rmtioctl(int cmd, int count) 304 { 305 char buf[256]; 306 307 if (count < 0) 308 return (-1); 309 (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count); 310 return (rmtcall("ioctl", buf)); 311 } 312 313 static int 314 rmtcall(const char *cmd, const char *buf) 315 { 316 317 if (write(rmtape, buf, strlen(buf)) != strlen(buf)) 318 rmtconnaborted(0); 319 return (rmtreply(cmd)); 320 } 321 322 static int 323 rmtreply(const char *cmd) 324 { 325 char *cp; 326 char code[30], emsg[BUFSIZ]; 327 328 rmtgets(code, sizeof (code)); 329 if (*code == 'E' || *code == 'F') { 330 rmtgets(emsg, sizeof (emsg)); 331 msg("%s: %s", cmd, emsg); 332 errno = atoi(code + 1); 333 if (*code == 'F') 334 rmtstate = TS_CLOSED; 335 return (-1); 336 } 337 if (*code != 'A') { 338 /* Kill trailing newline */ 339 cp = code + strlen(code); 340 if (cp > code && *--cp == '\n') 341 *cp = '\0'; 342 343 msg("Protocol to remote tape server botched (code \"%s\").\n", 344 code); 345 rmtconnaborted(0); 346 } 347 return (atoi(code + 1)); 348 } 349 350 int 351 rmtgetb(void) 352 { 353 char c; 354 355 if (read(rmtape, &c, 1) != 1) 356 rmtconnaborted(0); 357 return (c); 358 } 359 360 /* Get a line (guaranteed to have a trailing newline). */ 361 void 362 rmtgets(char *line, int len) 363 { 364 char *cp = line; 365 366 while (len > 1) { 367 *cp = rmtgetb(); 368 if (*cp == '\n') { 369 cp[1] = '\0'; 370 return; 371 } 372 cp++; 373 len--; 374 } 375 *cp = '\0'; 376 msg("Protocol to remote tape server botched.\n"); 377 msg("(rmtgets got \"%s\").\n", line); 378 rmtconnaborted(0); 379 } 380