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 * 4. 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 30 #ifndef lint 31 #if 0 32 static char sccsid[] = "@(#)dumprmt.c 8.3 (Berkeley) 4/28/95"; 33 #endif 34 static const char rcsid[] = 35 "$FreeBSD$"; 36 #endif /* not lint */ 37 38 #include <sys/param.h> 39 #include <sys/mtio.h> 40 #include <sys/socket.h> 41 #include <sys/time.h> 42 43 #include <ufs/ufs/dinode.h> 44 45 #include <netinet/in.h> 46 #include <netinet/in_systm.h> 47 #include <netinet/ip.h> 48 #include <netinet/tcp.h> 49 50 #include <protocols/dumprestore.h> 51 52 #include <ctype.h> 53 #include <netdb.h> 54 #include <pwd.h> 55 #include <stdio.h> 56 #include <limits.h> 57 #include <errno.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 62 #include "pathnames.h" 63 #include "dump.h" 64 65 #define TS_CLOSED 0 66 #define TS_OPEN 1 67 68 static int rmtstate = TS_CLOSED; 69 static int rmtape; 70 static char *rmtpeer; 71 72 static int okname(const char *); 73 static int rmtcall(const char *, const char *); 74 static void rmtconnaborted(int); 75 static int rmtgetb(void); 76 static void rmtgetconn(void); 77 static void rmtgets(char *, int); 78 static int rmtreply(const char *); 79 80 static int errfd = -1; 81 extern int ntrec; /* blocking factor on tape */ 82 83 int 84 rmthost(const char *host) 85 { 86 87 rmtpeer = strdup(host); 88 if (rmtpeer == NULL) 89 return (0); 90 signal(SIGPIPE, rmtconnaborted); 91 rmtgetconn(); 92 if (rmtape < 0) 93 return (0); 94 return (1); 95 } 96 97 static void 98 rmtconnaborted(int sig __unused) 99 { 100 msg("Lost connection to remote host.\n"); 101 if (errfd != -1) { 102 fd_set r; 103 struct timeval t; 104 105 FD_ZERO(&r); 106 FD_SET(errfd, &r); 107 t.tv_sec = 0; 108 t.tv_usec = 0; 109 if (select(errfd + 1, &r, NULL, NULL, &t)) { 110 int i; 111 char buf[2048]; 112 113 if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) { 114 buf[i] = '\0'; 115 msg("on %s: %s%s", rmtpeer, buf, 116 buf[i - 1] == '\n' ? "" : "\n"); 117 } 118 } 119 } 120 121 exit(X_ABORT); 122 } 123 124 void 125 rmtgetconn(void) 126 { 127 char *cp; 128 const char *rmt; 129 static struct servent *sp = NULL; 130 static struct passwd *pwd = NULL; 131 char *tuser; 132 int size; 133 int throughput; 134 int on; 135 136 if (sp == NULL) { 137 sp = getservbyname("shell", "tcp"); 138 if (sp == NULL) { 139 msg("shell/tcp: unknown service\n"); 140 exit(X_STARTUP); 141 } 142 pwd = getpwuid(getuid()); 143 if (pwd == NULL) { 144 msg("who are you?\n"); 145 exit(X_STARTUP); 146 } 147 } 148 if ((cp = strchr(rmtpeer, '@')) != NULL) { 149 tuser = rmtpeer; 150 *cp = '\0'; 151 if (!okname(tuser)) 152 exit(X_STARTUP); 153 rmtpeer = ++cp; 154 } else 155 tuser = pwd->pw_name; 156 if ((rmt = getenv("RMT")) == NULL) 157 rmt = _PATH_RMT; 158 msg("%s", ""); 159 rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name, 160 tuser, rmt, &errfd); 161 if (rmtape < 0) { 162 msg("login to %s as %s failed.\n", rmtpeer, tuser); 163 return; 164 } 165 (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer); 166 size = ntrec * TP_BSIZE; 167 if (size > 60 * 1024) /* XXX */ 168 size = 60 * 1024; 169 /* Leave some space for rmt request/response protocol */ 170 size += 2 * 1024; 171 while (size > TP_BSIZE && 172 setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0) 173 size -= TP_BSIZE; 174 (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)); 175 throughput = IPTOS_THROUGHPUT; 176 if (setsockopt(rmtape, IPPROTO_IP, IP_TOS, 177 &throughput, sizeof(throughput)) < 0) 178 perror("IP_TOS:IPTOS_THROUGHPUT setsockopt"); 179 on = 1; 180 if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0) 181 perror("TCP_NODELAY setsockopt"); 182 } 183 184 static int 185 okname(const char *cp0) 186 { 187 const char *cp; 188 int c; 189 190 for (cp = cp0; *cp; cp++) { 191 c = *cp; 192 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) { 193 msg("invalid user name %s\n", cp0); 194 return (0); 195 } 196 } 197 return (1); 198 } 199 200 int 201 rmtopen(const char *tape, int mode) 202 { 203 char buf[256]; 204 205 (void)snprintf(buf, sizeof (buf), "O%.226s\n%d\n", tape, mode); 206 rmtstate = TS_OPEN; 207 return (rmtcall(tape, buf)); 208 } 209 210 void 211 rmtclose(void) 212 { 213 214 if (rmtstate != TS_OPEN) 215 return; 216 rmtcall("close", "C\n"); 217 rmtstate = TS_CLOSED; 218 } 219 220 int 221 rmtread(char *buf, int count) 222 { 223 char line[30]; 224 int n, i, cc; 225 226 (void)snprintf(line, sizeof (line), "R%d\n", count); 227 n = rmtcall("read", line); 228 if (n < 0) 229 /* rmtcall() properly sets errno for us on errors. */ 230 return (n); 231 for (i = 0; i < n; i += cc) { 232 cc = read(rmtape, buf+i, n - i); 233 if (cc <= 0) 234 rmtconnaborted(0); 235 } 236 return (n); 237 } 238 239 int 240 rmtwrite(const char *buf, int count) 241 { 242 char line[30]; 243 244 (void)snprintf(line, sizeof (line), "W%d\n", count); 245 write(rmtape, line, strlen(line)); 246 write(rmtape, buf, count); 247 return (rmtreply("write")); 248 } 249 250 void 251 rmtwrite0(int count) 252 { 253 char line[30]; 254 255 (void)snprintf(line, sizeof (line), "W%d\n", count); 256 write(rmtape, line, strlen(line)); 257 } 258 259 void 260 rmtwrite1(const char *buf, int count) 261 { 262 263 write(rmtape, buf, count); 264 } 265 266 int 267 rmtwrite2(void) 268 { 269 270 return (rmtreply("write")); 271 } 272 273 int 274 rmtseek(int offset, int pos) /* XXX off_t ? */ 275 { 276 char line[80]; 277 278 (void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos); 279 return (rmtcall("seek", line)); 280 } 281 282 struct mtget mts; 283 284 struct mtget * 285 rmtstatus(void) 286 { 287 int i; 288 char *cp; 289 290 if (rmtstate != TS_OPEN) 291 return (NULL); 292 rmtcall("status", "S\n"); 293 for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++) 294 *cp++ = rmtgetb(); 295 return (&mts); 296 } 297 298 int 299 rmtioctl(int cmd, int count) 300 { 301 char buf[256]; 302 303 if (count < 0) 304 return (-1); 305 (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count); 306 return (rmtcall("ioctl", buf)); 307 } 308 309 static int 310 rmtcall(const char *cmd, const char *buf) 311 { 312 313 if (write(rmtape, buf, strlen(buf)) != strlen(buf)) 314 rmtconnaborted(0); 315 return (rmtreply(cmd)); 316 } 317 318 static int 319 rmtreply(const char *cmd) 320 { 321 char *cp; 322 char code[30], emsg[BUFSIZ]; 323 324 rmtgets(code, sizeof (code)); 325 if (*code == 'E' || *code == 'F') { 326 rmtgets(emsg, sizeof (emsg)); 327 msg("%s: %s", cmd, emsg); 328 errno = atoi(code + 1); 329 if (*code == 'F') 330 rmtstate = TS_CLOSED; 331 return (-1); 332 } 333 if (*code != 'A') { 334 /* Kill trailing newline */ 335 cp = code + strlen(code); 336 if (cp > code && *--cp == '\n') 337 *cp = '\0'; 338 339 msg("Protocol to remote tape server botched (code \"%s\").\n", 340 code); 341 rmtconnaborted(0); 342 } 343 return (atoi(code + 1)); 344 } 345 346 int 347 rmtgetb(void) 348 { 349 char c; 350 351 if (read(rmtape, &c, 1) != 1) 352 rmtconnaborted(0); 353 return (c); 354 } 355 356 /* Get a line (guaranteed to have a trailing newline). */ 357 void 358 rmtgets(char *line, int len) 359 { 360 char *cp = line; 361 362 while (len > 1) { 363 *cp = rmtgetb(); 364 if (*cp == '\n') { 365 cp[1] = '\0'; 366 return; 367 } 368 cp++; 369 len--; 370 } 371 *cp = '\0'; 372 msg("Protocol to remote tape server botched.\n"); 373 msg("(rmtgets got \"%s\").\n", line); 374 rmtconnaborted(0); 375 } 376