1 /* $NetBSD: dumprmt.c,v 1.33 2009/04/11 07:55:35 lukem Exp $ */ 2 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/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)dumprmt.c 8.3 (Berkeley) 4/28/95"; 36 #else 37 __RCSID("$NetBSD: dumprmt.c,v 1.33 2009/04/11 07:55:35 lukem Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 #include <sys/param.h> 42 #include <sys/mtio.h> 43 #include <sys/ioctl.h> 44 #include <sys/socket.h> 45 #include <sys/time.h> 46 #include <ufs/ufs/dinode.h> 47 48 #include <netinet/in.h> 49 #include <netinet/in_systm.h> 50 #include <netinet/ip.h> 51 #include <netinet/tcp.h> 52 53 #include <protocols/dumprestore.h> 54 55 #include <ctype.h> 56 #include <err.h> 57 #include <errno.h> 58 #include <netdb.h> 59 #include <pwd.h> 60 #include <signal.h> 61 #include <stdio.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(char *); 77 static int rmtcall(const char *, const char *, int); 78 static void rmtconnaborted(int); 79 static int rmtgetb(void); 80 static void rmtgetconn(void); 81 static void rmtgets(char *, int); 82 int rmtread(char *, int); 83 static int rmtreply(const char *, int); 84 int rmtseek(int, int); 85 86 extern int ntrec; /* blocking factor on tape */ 87 88 int 89 rmthost(const char *host) 90 { 91 92 if ((rmtpeer = strdup(host)) == NULL) 93 err(X_STARTUP, "strdup"); 94 signal(SIGPIPE, rmtconnaborted); 95 rmtgetconn(); 96 if (rmtape < 0) 97 return (0); 98 return (1); 99 } 100 101 static void 102 rmtconnaborted(int dummy __unused) 103 { 104 105 errx(X_ABORT, "Lost connection to remote host."); 106 } 107 108 void 109 rmtgetconn(void) 110 { 111 char *cp; 112 static struct servent *sp = NULL; 113 static struct passwd *pwd = NULL; 114 char *tuser, *name; 115 int size, opt; 116 117 if (sp == NULL) { 118 sp = getservbyname("shell", "tcp"); 119 if (sp == NULL) 120 errx(X_STARTUP, "shell/tcp: unknown service"); 121 pwd = getpwuid(getuid()); 122 if (pwd == NULL) 123 errx(X_STARTUP, "who are you?"); 124 } 125 if ((name = strdup(pwd->pw_name)) == NULL) 126 err(X_STARTUP, "strdup"); 127 if ((cp = strchr(rmtpeer, '@')) != NULL) { 128 tuser = rmtpeer; 129 *cp = '\0'; 130 if (!okname(tuser)) 131 exit(X_STARTUP); 132 rmtpeer = ++cp; 133 } else 134 tuser = name; 135 136 rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, name, tuser, _PATH_RMT, 137 (int *)0); 138 (void)free(name); 139 if (rmtape < 0) 140 return; 141 142 size = ntrec * TP_BSIZE; 143 if (size > 60 * 1024) /* XXX */ 144 size = 60 * 1024; 145 /* Leave some space for rmt request/response protocol */ 146 size += 2 * 1024; 147 while (size > TP_BSIZE && 148 setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0) 149 size -= TP_BSIZE; 150 (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)); 151 152 opt = IPTOS_THROUGHPUT; 153 (void)setsockopt(rmtape, IPPROTO_IP, IP_TOS, &opt, sizeof (opt)); 154 155 opt = 1; 156 (void)setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof (opt)); 157 } 158 159 static int 160 okname(char *cp0) 161 { 162 char *cp; 163 int c; 164 165 for (cp = cp0; *cp; cp++) { 166 c = *cp; 167 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) { 168 warnx("invalid user name: %s", cp0); 169 return (0); 170 } 171 } 172 return (1); 173 } 174 175 int 176 rmtopen(const char *tapedevice, int mode, int verbose) 177 { 178 char buf[256]; 179 180 (void)snprintf(buf, sizeof buf, "O%s\n%d\n", tapedevice, mode); 181 rmtstate = TS_OPEN; 182 return (rmtcall(tapedevice, buf, verbose)); 183 } 184 185 void 186 rmtclose(void) 187 { 188 189 if (rmtstate != TS_OPEN) 190 return; 191 rmtcall("close", "C\n", 1); 192 rmtstate = TS_CLOSED; 193 } 194 195 int 196 rmtread(char *buf, int count) 197 { 198 char line[30]; 199 int n, i, cc; 200 201 (void)snprintf(line, sizeof line, "R%d\n", count); 202 n = rmtcall("read", line, 1); 203 if (n < 0) { 204 /* rmtcall() properly sets errno for us on errors. */ 205 return (n); 206 } 207 for (i = 0; i < n; i += cc) { 208 cc = read(rmtape, buf+i, n - i); 209 if (cc <= 0) { 210 rmtconnaborted(0); 211 } 212 } 213 return (n); 214 } 215 216 int 217 rmtwrite(const char *buf, int count) 218 { 219 char line[30]; 220 221 (void)snprintf(line, sizeof line, "W%d\n", count); 222 write(rmtape, line, strlen(line)); 223 write(rmtape, buf, count); 224 return (rmtreply("write", 1)); 225 } 226 227 #if 0 /* XXX unused? */ 228 void 229 rmtwrite0(int count) 230 { 231 char line[30]; 232 233 (void)snprintf(line, sizeof line, "W%d\n", count); 234 write(rmtape, line, strlen(line)); 235 } 236 237 void 238 rmtwrite1(char *buf, int count) 239 { 240 241 write(rmtape, buf, count); 242 } 243 244 int 245 rmtwrite2(void) 246 { 247 248 return (rmtreply("write", 1)); 249 } 250 #endif 251 252 int 253 rmtseek(int offset, int pos) 254 { 255 char line[80]; 256 257 (void)snprintf(line, sizeof line, "L%d\n%d\n", offset, pos); 258 return (rmtcall("seek", line, 1)); 259 } 260 261 262 #if 0 /* XXX unused? */ 263 struct mtget * 264 rmtstatus(void) 265 { 266 struct mtget mts; 267 int i; 268 char *cp; 269 270 if (rmtstate != TS_OPEN) 271 return (NULL); 272 rmtcall("status", "S\n", 1); 273 for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++) 274 *cp++ = rmtgetb(); 275 return (&mts); 276 } 277 #endif 278 279 int 280 rmtioctl(int cmd, int count) 281 { 282 char buf[256]; 283 284 if (count < 0) 285 return (-1); 286 (void)snprintf(buf, sizeof buf, "I%d\n%d\n", cmd, count); 287 return (rmtcall("ioctl", buf, 1)); 288 } 289 290 static int 291 rmtcall(const char *cmd, const char *buf, int verbose) 292 { 293 294 if ((size_t)write(rmtape, buf, strlen(buf)) != strlen(buf)) 295 rmtconnaborted(0); 296 return (rmtreply(cmd, verbose)); 297 } 298 299 static int 300 rmtreply(const char *cmd, int verbose) 301 { 302 char *cp; 303 char code[30], emsg[BUFSIZ]; 304 305 rmtgets(code, sizeof (code)); 306 if (*code == 'E' || *code == 'F') { 307 rmtgets(emsg, sizeof (emsg)); 308 if (verbose) 309 msg("%s: %s", cmd, emsg); 310 errno = atoi(code + 1); 311 if (*code == 'F') 312 rmtstate = TS_CLOSED; 313 return (-1); 314 } 315 if (*code != 'A') { 316 /* Kill trailing newline */ 317 cp = code + strlen(code); 318 if (cp > code && *--cp == '\n') 319 *cp = '\0'; 320 321 msg("Protocol to remote tape server botched (code \"%s\").\n", 322 code); 323 rmtconnaborted(0); 324 } 325 return (atoi(code + 1)); 326 } 327 328 int 329 rmtgetb(void) 330 { 331 char c; 332 333 if (read(rmtape, &c, 1) != 1) 334 rmtconnaborted(0); 335 return (c); 336 } 337 338 /* Get a line (guaranteed to have a trailing newline). */ 339 void 340 rmtgets(char *line, int len) 341 { 342 char *cp = line; 343 344 while (len > 1) { 345 *cp = rmtgetb(); 346 if (*cp == '\n') { 347 cp[1] = '\0'; 348 return; 349 } 350 cp++; 351 len--; 352 } 353 *cp = '\0'; 354 msg("Protocol to remote tape server botched.\n"); 355 msg("(rmtgets got \"%s\").\n", line); 356 rmtconnaborted(0); 357 } 358