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 #include <sys/param.h> 33 #include <sys/mtio.h> 34 #include <sys/socket.h> 35 #include <sys/time.h> 36 37 #include <ufs/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 <netdb.h> 48 #include <pwd.h> 49 #include <stdio.h> 50 #include <limits.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(const 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 74 static int errfd = -1; 75 76 int 77 rmthost(const char *host) 78 { 79 80 rmtpeer = strdup(host); 81 if (rmtpeer == NULL) 82 return (0); 83 signal(SIGPIPE, rmtconnaborted); 84 rmtgetconn(); 85 if (rmtape < 0) 86 return (0); 87 return (1); 88 } 89 90 static void 91 rmtconnaborted(int sig __unused) 92 { 93 msg("Lost connection to remote host.\n"); 94 if (errfd != -1) { 95 fd_set r; 96 struct timeval t; 97 98 FD_ZERO(&r); 99 FD_SET(errfd, &r); 100 t.tv_sec = 0; 101 t.tv_usec = 0; 102 if (select(errfd + 1, &r, NULL, NULL, &t)) { 103 int i; 104 char buf[2048]; 105 106 if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) { 107 buf[i] = '\0'; 108 msg("on %s: %s%s", rmtpeer, buf, 109 buf[i - 1] == '\n' ? "" : "\n"); 110 } 111 } 112 } 113 114 exit(X_ABORT); 115 } 116 117 void 118 rmtgetconn(void) 119 { 120 char *cp; 121 const char *rmt; 122 static struct servent *sp = NULL; 123 static struct passwd *pwd = NULL; 124 char *tuser; 125 int size; 126 int throughput; 127 int on; 128 129 if (sp == NULL) { 130 sp = getservbyname("shell", "tcp"); 131 if (sp == NULL) { 132 msg("shell/tcp: unknown service\n"); 133 exit(X_STARTUP); 134 } 135 pwd = getpwuid(getuid()); 136 if (pwd == NULL) { 137 msg("who are you?\n"); 138 exit(X_STARTUP); 139 } 140 } 141 if ((cp = strchr(rmtpeer, '@')) != NULL) { 142 tuser = rmtpeer; 143 *cp = '\0'; 144 if (!okname(tuser)) 145 exit(X_STARTUP); 146 rmtpeer = ++cp; 147 } else 148 tuser = pwd->pw_name; 149 if ((rmt = getenv("RMT")) == NULL) 150 rmt = _PATH_RMT; 151 msg("%s", ""); 152 rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name, 153 tuser, rmt, &errfd); 154 if (rmtape < 0) { 155 msg("login to %s as %s failed.\n", rmtpeer, tuser); 156 return; 157 } 158 (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer); 159 size = ntrec * TP_BSIZE; 160 if (size > 60 * 1024) /* XXX */ 161 size = 60 * 1024; 162 /* Leave some space for rmt request/response protocol */ 163 size += 2 * 1024; 164 while (size > TP_BSIZE && 165 setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0) 166 size -= TP_BSIZE; 167 (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)); 168 throughput = IPTOS_THROUGHPUT; 169 if (setsockopt(rmtape, IPPROTO_IP, IP_TOS, 170 &throughput, sizeof(throughput)) < 0) 171 perror("IP_TOS:IPTOS_THROUGHPUT setsockopt"); 172 on = 1; 173 if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0) 174 perror("TCP_NODELAY setsockopt"); 175 } 176 177 static int 178 okname(const char *cp0) 179 { 180 const char *cp; 181 int c; 182 183 for (cp = cp0; *cp; cp++) { 184 c = *cp; 185 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) { 186 msg("invalid user name %s\n", cp0); 187 return (0); 188 } 189 } 190 return (1); 191 } 192 193 int 194 rmtopen(const char *tape, int mode) 195 { 196 char buf[256]; 197 198 (void)snprintf(buf, sizeof (buf), "O%.226s\n%d\n", tape, mode); 199 rmtstate = TS_OPEN; 200 return (rmtcall(tape, buf)); 201 } 202 203 void 204 rmtclose(void) 205 { 206 207 if (rmtstate != TS_OPEN) 208 return; 209 rmtcall("close", "C\n"); 210 rmtstate = TS_CLOSED; 211 } 212 213 int 214 rmtread(char *buf, int count) 215 { 216 char line[30]; 217 int n, i, cc; 218 219 (void)snprintf(line, sizeof (line), "R%d\n", count); 220 n = rmtcall("read", line); 221 if (n < 0) 222 /* rmtcall() properly sets errno for us on errors. */ 223 return (n); 224 for (i = 0; i < n; i += cc) { 225 cc = read(rmtape, buf+i, n - i); 226 if (cc <= 0) 227 rmtconnaborted(0); 228 } 229 return (n); 230 } 231 232 int 233 rmtwrite(const char *buf, int count) 234 { 235 char line[30]; 236 237 (void)snprintf(line, sizeof (line), "W%d\n", count); 238 write(rmtape, line, strlen(line)); 239 write(rmtape, buf, count); 240 return (rmtreply("write")); 241 } 242 243 void 244 rmtwrite0(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 } 251 252 void 253 rmtwrite1(const char *buf, int count) 254 { 255 256 write(rmtape, buf, count); 257 } 258 259 int 260 rmtwrite2(void) 261 { 262 263 return (rmtreply("write")); 264 } 265 266 int 267 rmtseek(int offset, int pos) /* XXX off_t ? */ 268 { 269 char line[80]; 270 271 (void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos); 272 return (rmtcall("seek", line)); 273 } 274 275 struct mtget mts; 276 277 struct mtget * 278 rmtstatus(void) 279 { 280 int i; 281 char *cp; 282 283 if (rmtstate != TS_OPEN) 284 return (NULL); 285 rmtcall("status", "S\n"); 286 for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++) 287 *cp++ = rmtgetb(); 288 return (&mts); 289 } 290 291 int 292 rmtioctl(int cmd, int count) 293 { 294 char buf[256]; 295 296 if (count < 0) 297 return (-1); 298 (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count); 299 return (rmtcall("ioctl", buf)); 300 } 301 302 static int 303 rmtcall(const char *cmd, const char *buf) 304 { 305 306 if (write(rmtape, buf, strlen(buf)) != strlen(buf)) 307 rmtconnaborted(0); 308 return (rmtreply(cmd)); 309 } 310 311 static int 312 rmtreply(const char *cmd) 313 { 314 char *cp; 315 char code[30], emsg[BUFSIZ]; 316 317 rmtgets(code, sizeof (code)); 318 if (*code == 'E' || *code == 'F') { 319 rmtgets(emsg, sizeof (emsg)); 320 msg("%s: %s", cmd, emsg); 321 errno = atoi(code + 1); 322 if (*code == 'F') 323 rmtstate = TS_CLOSED; 324 return (-1); 325 } 326 if (*code != 'A') { 327 /* Kill trailing newline */ 328 cp = code + strlen(code); 329 if (cp > code && *--cp == '\n') 330 *cp = '\0'; 331 332 msg("Protocol to remote tape server botched (code \"%s\").\n", 333 code); 334 rmtconnaborted(0); 335 } 336 return (atoi(code + 1)); 337 } 338 339 int 340 rmtgetb(void) 341 { 342 char c; 343 344 if (read(rmtape, &c, 1) != 1) 345 rmtconnaborted(0); 346 return (c); 347 } 348 349 /* Get a line (guaranteed to have a trailing newline). */ 350 void 351 rmtgets(char *line, int len) 352 { 353 char *cp = line; 354 355 while (len > 1) { 356 *cp = rmtgetb(); 357 if (*cp == '\n') { 358 cp[1] = '\0'; 359 return; 360 } 361 cp++; 362 len--; 363 } 364 *cp = '\0'; 365 msg("Protocol to remote tape server botched.\n"); 366 msg("(rmtgets got \"%s\").\n", line); 367 rmtconnaborted(0); 368 } 369