1 /* $NetBSD: dumprmt.c,v 1.29 2001/12/25 12:06:26 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)dumprmt.c 8.3 (Berkeley) 4/28/95"; 40 #else 41 __RCSID("$NetBSD: dumprmt.c,v 1.29 2001/12/25 12:06:26 lukem Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <sys/mtio.h> 47 #include <sys/ioctl.h> 48 #include <sys/socket.h> 49 #include <sys/time.h> 50 #include <ufs/ufs/dinode.h> 51 52 #include <netinet/in.h> 53 #include <netinet/in_systm.h> 54 #include <netinet/ip.h> 55 #include <netinet/tcp.h> 56 57 #include <protocols/dumprestore.h> 58 59 #include <ctype.h> 60 #include <err.h> 61 #include <errno.h> 62 #include <netdb.h> 63 #include <pwd.h> 64 #include <signal.h> 65 #include <stdio.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include <unistd.h> 69 70 #include "pathnames.h" 71 #include "dump.h" 72 73 #define TS_CLOSED 0 74 #define TS_OPEN 1 75 76 static int rmtstate = TS_CLOSED; 77 static int rmtape; 78 static char *rmtpeer; 79 80 static int okname(char *); 81 static int rmtcall(char *, char *, int); 82 static void rmtconnaborted(int); 83 static int rmtgetb(void); 84 static void rmtgetconn(void); 85 static void rmtgets(char *, int); 86 int rmtread(char *, int); 87 static int rmtreply(char *, int); 88 int rmtseek(int, int); 89 90 extern int ntrec; /* blocking factor on tape */ 91 92 int 93 rmthost(char *host) 94 { 95 96 if ((rmtpeer = strdup(host)) == NULL) 97 err(X_STARTUP, "strdup"); 98 signal(SIGPIPE, rmtconnaborted); 99 rmtgetconn(); 100 if (rmtape < 0) 101 return (0); 102 return (1); 103 } 104 105 static void 106 rmtconnaborted(int dummy) 107 { 108 109 errx(X_ABORT, "Lost connection to remote host."); 110 } 111 112 void 113 rmtgetconn(void) 114 { 115 char *cp; 116 static struct servent *sp = NULL; 117 static struct passwd *pwd = NULL; 118 char *tuser, *name; 119 int size, opt; 120 121 if (sp == NULL) { 122 sp = getservbyname("shell", "tcp"); 123 if (sp == NULL) 124 errx(X_STARTUP, "shell/tcp: unknown service"); 125 pwd = getpwuid(getuid()); 126 if (pwd == NULL) 127 errx(X_STARTUP, "who are you?"); 128 } 129 if ((name = strdup(pwd->pw_name)) == NULL) 130 err(X_STARTUP, "strdup"); 131 if ((cp = strchr(rmtpeer, '@')) != NULL) { 132 tuser = rmtpeer; 133 *cp = '\0'; 134 if (!okname(tuser)) 135 exit(X_STARTUP); 136 rmtpeer = ++cp; 137 } else 138 tuser = name; 139 140 rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, name, tuser, _PATH_RMT, 141 (int *)0); 142 (void)free(name); 143 if (rmtape < 0) 144 return; 145 146 size = ntrec * TP_BSIZE; 147 if (size > 60 * 1024) /* XXX */ 148 size = 60 * 1024; 149 /* Leave some space for rmt request/response protocol */ 150 size += 2 * 1024; 151 while (size > TP_BSIZE && 152 setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0) 153 size -= TP_BSIZE; 154 (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)); 155 156 opt = IPTOS_THROUGHPUT; 157 (void)setsockopt(rmtape, IPPROTO_IP, IP_TOS, &opt, sizeof (opt)); 158 159 opt = 1; 160 (void)setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof (opt)); 161 } 162 163 static int 164 okname(char *cp0) 165 { 166 char *cp; 167 int c; 168 169 for (cp = cp0; *cp; cp++) { 170 c = *cp; 171 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) { 172 warnx("invalid user name: %s", cp0); 173 return (0); 174 } 175 } 176 return (1); 177 } 178 179 int 180 rmtopen(char *tapedevice, int mode, int verbose) 181 { 182 char buf[256]; 183 184 (void)snprintf(buf, sizeof buf, "O%s\n%d\n", tapedevice, mode); 185 rmtstate = TS_OPEN; 186 return (rmtcall(tapedevice, buf, verbose)); 187 } 188 189 void 190 rmtclose(void) 191 { 192 193 if (rmtstate != TS_OPEN) 194 return; 195 rmtcall("close", "C\n", 1); 196 rmtstate = TS_CLOSED; 197 } 198 199 int 200 rmtread(char *buf, int count) 201 { 202 char line[30]; 203 int n, i, cc; 204 205 (void)snprintf(line, sizeof line, "R%d\n", count); 206 n = rmtcall("read", line, 1); 207 if (n < 0) { 208 /* rmtcall() properly sets errno for us on errors. */ 209 return (n); 210 } 211 for (i = 0; i < n; i += cc) { 212 cc = read(rmtape, buf+i, n - i); 213 if (cc <= 0) { 214 rmtconnaborted(0); 215 } 216 } 217 return (n); 218 } 219 220 int 221 rmtwrite(char *buf, int count) 222 { 223 char line[30]; 224 225 (void)snprintf(line, sizeof line, "W%d\n", count); 226 write(rmtape, line, strlen(line)); 227 write(rmtape, buf, count); 228 return (rmtreply("write", 1)); 229 } 230 231 #if 0 /* XXX unused? */ 232 void 233 rmtwrite0(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 } 240 241 void 242 rmtwrite1(char *buf, int count) 243 { 244 245 write(rmtape, buf, count); 246 } 247 248 int 249 rmtwrite2(void) 250 { 251 252 return (rmtreply("write", 1)); 253 } 254 #endif 255 256 int 257 rmtseek(int offset, int pos) 258 { 259 char line[80]; 260 261 (void)snprintf(line, sizeof line, "L%d\n%d\n", offset, pos); 262 return (rmtcall("seek", line, 1)); 263 } 264 265 266 #if 0 /* XXX unused? */ 267 struct mtget * 268 rmtstatus(void) 269 { 270 struct mtget mts; 271 int i; 272 char *cp; 273 274 if (rmtstate != TS_OPEN) 275 return (NULL); 276 rmtcall("status", "S\n", 1); 277 for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++) 278 *cp++ = rmtgetb(); 279 return (&mts); 280 } 281 #endif 282 283 int 284 rmtioctl(int cmd, int count) 285 { 286 char buf[256]; 287 288 if (count < 0) 289 return (-1); 290 (void)snprintf(buf, sizeof buf, "I%d\n%d\n", cmd, count); 291 return (rmtcall("ioctl", buf, 1)); 292 } 293 294 static int 295 rmtcall(char *cmd, char *buf, int verbose) 296 { 297 298 if (write(rmtape, buf, strlen(buf)) != strlen(buf)) 299 rmtconnaborted(0); 300 return (rmtreply(cmd, verbose)); 301 } 302 303 static int 304 rmtreply(char *cmd, int verbose) 305 { 306 char *cp; 307 char code[30], emsg[BUFSIZ]; 308 309 rmtgets(code, sizeof (code)); 310 if (*code == 'E' || *code == 'F') { 311 rmtgets(emsg, sizeof (emsg)); 312 if (verbose) 313 msg("%s: %s", cmd, emsg); 314 errno = atoi(code + 1); 315 if (*code == 'F') 316 rmtstate = TS_CLOSED; 317 return (-1); 318 } 319 if (*code != 'A') { 320 /* Kill trailing newline */ 321 cp = code + strlen(code); 322 if (cp > code && *--cp == '\n') 323 *cp = '\0'; 324 325 msg("Protocol to remote tape server botched (code \"%s\").\n", 326 code); 327 rmtconnaborted(0); 328 } 329 return (atoi(code + 1)); 330 } 331 332 int 333 rmtgetb(void) 334 { 335 char c; 336 337 if (read(rmtape, &c, 1) != 1) 338 rmtconnaborted(0); 339 return (c); 340 } 341 342 /* Get a line (guaranteed to have a trailing newline). */ 343 void 344 rmtgets(char *line, int len) 345 { 346 char *cp = line; 347 348 while (len > 1) { 349 *cp = rmtgetb(); 350 if (*cp == '\n') { 351 cp[1] = '\0'; 352 return; 353 } 354 cp++; 355 len--; 356 } 357 *cp = '\0'; 358 msg("Protocol to remote tape server botched.\n"); 359 msg("(rmtgets got \"%s\").\n", line); 360 rmtconnaborted(0); 361 } 362