1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 #ifndef lint 33 #if 0 34 static char sccsid[] = "@(#)dumprmt.c 8.3 (Berkeley) 4/28/95"; 35 #endif 36 static const char rcsid[] = 37 "$FreeBSD$"; 38 #endif /* not lint */ 39 40 #include <sys/param.h> 41 #include <sys/mtio.h> 42 #include <sys/socket.h> 43 #include <sys/time.h> 44 45 #include <ufs/ufs/dinode.h> 46 47 #include <netinet/in.h> 48 #include <netinet/in_systm.h> 49 #include <netinet/ip.h> 50 #include <netinet/tcp.h> 51 52 #include <protocols/dumprestore.h> 53 54 #include <ctype.h> 55 #include <netdb.h> 56 #include <pwd.h> 57 #include <stdio.h> 58 #include <limits.h> 59 #include <errno.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <unistd.h> 63 64 #include "pathnames.h" 65 #include "dump.h" 66 67 #define TS_CLOSED 0 68 #define TS_OPEN 1 69 70 static int rmtstate = TS_CLOSED; 71 static int rmtape; 72 static char *rmtpeer; 73 74 static int okname(const char *); 75 static int rmtcall(const char *, const char *); 76 static void rmtconnaborted(int); 77 static int rmtgetb(void); 78 static void rmtgetconn(void); 79 static void rmtgets(char *, int); 80 static int rmtreply(const char *); 81 82 static int errfd = -1; 83 extern int ntrec; /* blocking factor on tape */ 84 85 int 86 rmthost(const char *host) 87 { 88 89 rmtpeer = strdup(host); 90 if (rmtpeer == NULL) 91 return (0); 92 signal(SIGPIPE, rmtconnaborted); 93 rmtgetconn(); 94 if (rmtape < 0) 95 return (0); 96 return (1); 97 } 98 99 static void 100 rmtconnaborted(int sig __unused) 101 { 102 msg("Lost connection to remote host.\n"); 103 if (errfd != -1) { 104 fd_set r; 105 struct timeval t; 106 107 FD_ZERO(&r); 108 FD_SET(errfd, &r); 109 t.tv_sec = 0; 110 t.tv_usec = 0; 111 if (select(errfd + 1, &r, NULL, NULL, &t)) { 112 int i; 113 char buf[2048]; 114 115 if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) { 116 buf[i] = '\0'; 117 msg("on %s: %s%s", rmtpeer, buf, 118 buf[i - 1] == '\n' ? "" : "\n"); 119 } 120 } 121 } 122 123 exit(X_ABORT); 124 } 125 126 void 127 rmtgetconn(void) 128 { 129 char *cp; 130 const char *rmt; 131 static struct servent *sp = NULL; 132 static struct passwd *pwd = NULL; 133 char *tuser; 134 int size; 135 int throughput; 136 int on; 137 138 if (sp == NULL) { 139 sp = getservbyname("shell", "tcp"); 140 if (sp == NULL) { 141 msg("shell/tcp: unknown service\n"); 142 exit(X_STARTUP); 143 } 144 pwd = getpwuid(getuid()); 145 if (pwd == NULL) { 146 msg("who are you?\n"); 147 exit(X_STARTUP); 148 } 149 } 150 if ((cp = strchr(rmtpeer, '@')) != NULL) { 151 tuser = rmtpeer; 152 *cp = '\0'; 153 if (!okname(tuser)) 154 exit(X_STARTUP); 155 rmtpeer = ++cp; 156 } else 157 tuser = pwd->pw_name; 158 if ((rmt = getenv("RMT")) == NULL) 159 rmt = _PATH_RMT; 160 msg("%s", ""); 161 rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name, 162 tuser, rmt, &errfd); 163 if (rmtape < 0) { 164 msg("login to %s as %s failed.\n", rmtpeer, tuser); 165 return; 166 } 167 (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer); 168 size = ntrec * TP_BSIZE; 169 if (size > 60 * 1024) /* XXX */ 170 size = 60 * 1024; 171 /* Leave some space for rmt request/response protocol */ 172 size += 2 * 1024; 173 while (size > TP_BSIZE && 174 setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0) 175 size -= TP_BSIZE; 176 (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)); 177 throughput = IPTOS_THROUGHPUT; 178 if (setsockopt(rmtape, IPPROTO_IP, IP_TOS, 179 &throughput, sizeof(throughput)) < 0) 180 perror("IP_TOS:IPTOS_THROUGHPUT setsockopt"); 181 on = 1; 182 if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0) 183 perror("TCP_NODELAY setsockopt"); 184 } 185 186 static int 187 okname(const char *cp0) 188 { 189 const char *cp; 190 int c; 191 192 for (cp = cp0; *cp; cp++) { 193 c = *cp; 194 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) { 195 msg("invalid user name %s\n", cp0); 196 return (0); 197 } 198 } 199 return (1); 200 } 201 202 int 203 rmtopen(const char *tape, int mode) 204 { 205 char buf[256]; 206 207 (void)snprintf(buf, sizeof (buf), "O%.226s\n%d\n", tape, mode); 208 rmtstate = TS_OPEN; 209 return (rmtcall(tape, buf)); 210 } 211 212 void 213 rmtclose(void) 214 { 215 216 if (rmtstate != TS_OPEN) 217 return; 218 rmtcall("close", "C\n"); 219 rmtstate = TS_CLOSED; 220 } 221 222 int 223 rmtread(char *buf, int count) 224 { 225 char line[30]; 226 int n, i, cc; 227 228 (void)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 rmtwrite(const char *buf, int count) 243 { 244 char line[30]; 245 246 (void)snprintf(line, sizeof (line), "W%d\n", count); 247 write(rmtape, line, strlen(line)); 248 write(rmtape, buf, count); 249 return (rmtreply("write")); 250 } 251 252 void 253 rmtwrite0(int count) 254 { 255 char line[30]; 256 257 (void)snprintf(line, sizeof (line), "W%d\n", count); 258 write(rmtape, line, strlen(line)); 259 } 260 261 void 262 rmtwrite1(const char *buf, int count) 263 { 264 265 write(rmtape, buf, count); 266 } 267 268 int 269 rmtwrite2(void) 270 { 271 272 return (rmtreply("write")); 273 } 274 275 int 276 rmtseek(int offset, int pos) /* XXX off_t ? */ 277 { 278 char line[80]; 279 280 (void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos); 281 return (rmtcall("seek", line)); 282 } 283 284 struct mtget mts; 285 286 struct mtget * 287 rmtstatus(void) 288 { 289 int i; 290 char *cp; 291 292 if (rmtstate != TS_OPEN) 293 return (NULL); 294 rmtcall("status", "S\n"); 295 for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++) 296 *cp++ = rmtgetb(); 297 return (&mts); 298 } 299 300 int 301 rmtioctl(int cmd, int count) 302 { 303 char buf[256]; 304 305 if (count < 0) 306 return (-1); 307 (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count); 308 return (rmtcall("ioctl", buf)); 309 } 310 311 static int 312 rmtcall(const char *cmd, const char *buf) 313 { 314 315 if (write(rmtape, buf, strlen(buf)) != strlen(buf)) 316 rmtconnaborted(0); 317 return (rmtreply(cmd)); 318 } 319 320 static int 321 rmtreply(const char *cmd) 322 { 323 char *cp; 324 char code[30], emsg[BUFSIZ]; 325 326 rmtgets(code, sizeof (code)); 327 if (*code == 'E' || *code == 'F') { 328 rmtgets(emsg, sizeof (emsg)); 329 msg("%s: %s", cmd, emsg); 330 errno = atoi(code + 1); 331 if (*code == 'F') 332 rmtstate = TS_CLOSED; 333 return (-1); 334 } 335 if (*code != 'A') { 336 /* Kill trailing newline */ 337 cp = code + strlen(code); 338 if (cp > code && *--cp == '\n') 339 *cp = '\0'; 340 341 msg("Protocol to remote tape server botched (code \"%s\").\n", 342 code); 343 rmtconnaborted(0); 344 } 345 return (atoi(code + 1)); 346 } 347 348 int 349 rmtgetb(void) 350 { 351 char c; 352 353 if (read(rmtape, &c, 1) != 1) 354 rmtconnaborted(0); 355 return (c); 356 } 357 358 /* Get a line (guaranteed to have a trailing newline). */ 359 void 360 rmtgets(char *line, int len) 361 { 362 char *cp = line; 363 364 while (len > 1) { 365 *cp = rmtgetb(); 366 if (*cp == '\n') { 367 cp[1] = '\0'; 368 return; 369 } 370 cp++; 371 len--; 372 } 373 *cp = '\0'; 374 msg("Protocol to remote tape server botched.\n"); 375 msg("(rmtgets got \"%s\").\n", line); 376 rmtconnaborted(0); 377 } 378