1/* $NetBSD: dumprmt.c,v 1.36 2013/01/13 22:54:24 dholland 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 35static char sccsid[] = "@(#)dumprmt.c 8.3 (Berkeley) 4/28/95"; 36#else 37__RCSID("$NetBSD: dumprmt.c,v 1.36 2013/01/13 22:54:24 dholland 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 47#include <netinet/in.h> 48#include <netinet/in_systm.h> 49#include <netinet/ip.h> 50#include <netinet/tcp.h> 51 52#include <ctype.h> 53#include <err.h> 54#include <errno.h> 55#include <netdb.h> 56#include <pwd.h> 57#include <signal.h> 58#include <stdio.h> 59#include <stdlib.h> 60#include <string.h> 61#include <unistd.h> 62 63#include "pathnames.h" 64#include "dump.h" 65 66#define TS_CLOSED 0 67#define TS_OPEN 1 68 69static int rmtstate = TS_CLOSED; 70static int rmtape; 71static char *rmtpeer; 72 73static int okname(const char *); 74static int rmtcall(const char *, const char *, int); 75__dead static void rmtconnaborted(int); 76static int rmtgetb(void); 77static void rmtgetconn(void); 78static void rmtgets(char *, int); 79 int rmtread(char *, int); 80static int rmtreply(const char *, int); 81 int rmtseek(int, int); 82 83extern int ntrec; /* blocking factor on tape */ 84 85int 86rmthost(const char *host) 87{ 88 89 if ((rmtpeer = strdup(host)) == NULL) 90 err(X_STARTUP, "strdup"); 91 signal(SIGPIPE, rmtconnaborted); 92 rmtgetconn(); 93 if (rmtape < 0) 94 return (0); 95 return (1); 96} 97 98static void 99rmtconnaborted(int dummy __unused) 100{ 101 102 errx(X_ABORT, "Lost connection to remote host."); 103} 104 105void 106rmtgetconn(void) 107{ 108 char *cp; 109 static struct servent *sp = NULL; 110 static struct passwd *pwd = NULL; 111 char *tuser, *name; 112 int size, opt; 113 114 if (sp == NULL) { 115 sp = getservbyname("shell", "tcp"); 116 if (sp == NULL) 117 errx(X_STARTUP, "shell/tcp: unknown service"); 118 pwd = getpwuid(getuid()); 119 if (pwd == NULL) 120 errx(X_STARTUP, "who are you?"); 121 } 122 if ((name = strdup(pwd->pw_name)) == NULL) 123 err(X_STARTUP, "strdup"); 124 if ((cp = strchr(rmtpeer, '@')) != NULL) { 125 tuser = rmtpeer; 126 *cp = '\0'; 127 if (!okname(tuser)) 128 exit(X_STARTUP); 129 rmtpeer = ++cp; 130 } else 131 tuser = name; 132 133 rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, name, tuser, _PATH_RMT, 134 (int *)0); 135 (void)free(name); 136 if (rmtape < 0) 137 return; 138 139 size = ntrec * TP_BSIZE; 140 if (size > 60 * 1024) /* XXX */ 141 size = 60 * 1024; 142 /* Leave some space for rmt request/response protocol */ 143 size += 2 * 1024; 144 while (size > TP_BSIZE && 145 setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0) 146 size -= TP_BSIZE; 147 (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)); 148 149 opt = IPTOS_THROUGHPUT; 150 (void)setsockopt(rmtape, IPPROTO_IP, IP_TOS, &opt, sizeof (opt)); 151 152 opt = 1; 153 (void)setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof (opt)); 154} 155 156static int 157okname(const char *cp0) 158{ 159 const char *cp; 160 unsigned char c; 161 162 for (cp = cp0; *cp; cp++) { 163 c = *cp; 164 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) { 165 warnx("invalid user name: %s", cp0); 166 return (0); 167 } 168 } 169 return (1); 170} 171 172int 173rmtopen(const char *tapedevice, int mode, int verbose) 174{ 175 char buf[256]; 176 177 (void)snprintf(buf, sizeof buf, "O%s\n%d\n", tapedevice, mode); 178 rmtstate = TS_OPEN; 179 return (rmtcall(tapedevice, buf, verbose)); 180} 181 182void 183rmtclose(void) 184{ 185 186 if (rmtstate != TS_OPEN) 187 return; 188 rmtcall("close", "C\n", 1); 189 rmtstate = TS_CLOSED; 190} 191 192int 193rmtread(char *buf, int count) 194{ 195 char line[30]; 196 int n, i, cc; 197 198 (void)snprintf(line, sizeof line, "R%d\n", count); 199 n = rmtcall("read", line, 1); 200 if (n < 0) { 201 /* rmtcall() properly sets errno for us on errors. */ 202 return (n); 203 } 204 for (i = 0; i < n; i += cc) { 205 cc = read(rmtape, buf+i, n - i); 206 if (cc <= 0) { 207 rmtconnaborted(0); 208 } 209 } 210 return (n); 211} 212 213int 214rmtwrite(const char *buf, int count) 215{ 216 char line[30]; 217 218 (void)snprintf(line, sizeof line, "W%d\n", count); 219 write(rmtape, line, strlen(line)); 220 write(rmtape, buf, count); 221 return (rmtreply("write", 1)); 222} 223 224#if 0 /* XXX unused? */ 225void 226rmtwrite0(int count) 227{ 228 char line[30]; 229 230 (void)snprintf(line, sizeof line, "W%d\n", count); 231 write(rmtape, line, strlen(line)); 232} 233 234void 235rmtwrite1(char *buf, int count) 236{ 237 238 write(rmtape, buf, count); 239} 240 241int 242rmtwrite2(void) 243{ 244 245 return (rmtreply("write", 1)); 246} 247#endif 248 249int 250rmtseek(int offset, int pos) 251{ 252 char line[80]; 253 254 (void)snprintf(line, sizeof line, "L%d\n%d\n", offset, pos); 255 return (rmtcall("seek", line, 1)); 256} 257 258 259#if 0 /* XXX unused? */ 260struct mtget * 261rmtstatus(void) 262{ 263 struct mtget mts; 264 int i; 265 char *cp; 266 267 if (rmtstate != TS_OPEN) 268 return (NULL); 269 rmtcall("status", "S\n", 1); 270 for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++) 271 *cp++ = rmtgetb(); 272 return (&mts); 273} 274#endif 275 276int 277rmtioctl(int cmd, int count) 278{ 279 char buf[256]; 280 281 if (count < 0) 282 return (-1); 283 (void)snprintf(buf, sizeof buf, "I%d\n%d\n", cmd, count); 284 return (rmtcall("ioctl", buf, 1)); 285} 286 287static int 288rmtcall(const char *cmd, const char *buf, int verbose) 289{ 290 291 if ((size_t)write(rmtape, buf, strlen(buf)) != strlen(buf)) 292 rmtconnaborted(0); 293 return (rmtreply(cmd, verbose)); 294} 295 296static int 297rmtreply(const char *cmd, int verbose) 298{ 299 char *cp; 300 char code[30], emsg[BUFSIZ]; 301 302 rmtgets(code, sizeof (code)); 303 if (*code == 'E' || *code == 'F') { 304 rmtgets(emsg, sizeof (emsg)); 305 if (verbose) 306 msg("%s: %s", cmd, emsg); 307 errno = atoi(code + 1); 308 if (*code == 'F') 309 rmtstate = TS_CLOSED; 310 return (-1); 311 } 312 if (*code != 'A') { 313 /* Kill trailing newline */ 314 cp = code + strlen(code); 315 if (cp > code && *--cp == '\n') 316 *cp = '\0'; 317 318 msg("Protocol to remote tape server botched (code \"%s\").\n", 319 code); 320 rmtconnaborted(0); 321 } 322 return (atoi(code + 1)); 323} 324 325int 326rmtgetb(void) 327{ 328 char c; 329 330 if (read(rmtape, &c, 1) != 1) 331 rmtconnaborted(0); 332 return (c); 333} 334 335/* Get a line (guaranteed to have a trailing newline). */ 336void 337rmtgets(char *line, int len) 338{ 339 char *cp = line; 340 341 while (len > 1) { 342 *cp = rmtgetb(); 343 if (*cp == '\n') { 344 cp[1] = '\0'; 345 return; 346 } 347 cp++; 348 len--; 349 } 350 *cp = '\0'; 351 msg("Protocol to remote tape server botched.\n"); 352 msg("(rmtgets got \"%s\").\n", line); 353 rmtconnaborted(0); 354} 355