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 * 3. 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 * @(#)dumprmt.c 8.3 (Berkeley) 4/28/95 30 * $FreeBSD: src/sbin/dump/dumprmt.c,v 1.14.2.1 2000/07/01 06:31:52 ps Exp $ 31 */ 32 33 #include <sys/param.h> 34 #include <sys/mtio.h> 35 #include <sys/socket.h> 36 #include <sys/time.h> 37 #include <vfs/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 <err.h> 48 #include <netdb.h> 49 #include <pwd.h> 50 #include <stdio.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(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 #ifdef KERBEROS 74 int krcmd(char **, int /*u_short*/, char *, char *, int *, char *); 75 #endif 76 77 static int errfd = -1; 78 79 int 80 rmthost(const char *hostname) 81 { 82 83 if ((rmtpeer = strdup(hostname)) == NULL) 84 err(1, "strdup failed"); 85 signal(SIGPIPE, rmtconnaborted); 86 rmtgetconn(); 87 if (rmtape < 0) 88 return (0); 89 return (1); 90 } 91 92 static void 93 rmtconnaborted(int signo __unused) 94 { 95 msg("Lost connection to remote host.\n"); 96 if (errfd != -1) { 97 fd_set r; 98 struct timeval t; 99 100 FD_ZERO(&r); 101 FD_SET(errfd, &r); 102 t.tv_sec = 0; 103 t.tv_usec = 0; 104 if (select(errfd + 1, &r, NULL, NULL, &t)) { 105 int i; 106 char buf[2048]; 107 108 if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) { 109 buf[i] = '\0'; 110 msg("on %s: %s%s", rmtpeer, buf, 111 buf[i - 1] == '\n' ? "" : "\n"); 112 } 113 } 114 } 115 116 exit(X_ABORT); 117 } 118 119 void 120 rmtgetconn(void) 121 { 122 char *cp; 123 const char *rmt; 124 static struct servent *sp = NULL; 125 static struct passwd *pwd = NULL; 126 char *tuser; 127 int size; 128 int throughput; 129 int on; 130 131 if (sp == NULL) { 132 sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp"); 133 if (sp == NULL) { 134 msg("%s/tcp: unknown service\n", 135 dokerberos ? "kshell" : "shell"); 136 exit(X_STARTUP); 137 } 138 pwd = getpwuid(getuid()); 139 if (pwd == NULL) { 140 msg("who are you?\n"); 141 exit(X_STARTUP); 142 } 143 } 144 if ((cp = strchr(rmtpeer, '@')) != NULL) { 145 tuser = rmtpeer; 146 *cp = '\0'; 147 if (!okname(tuser)) 148 exit(X_STARTUP); 149 rmtpeer = ++cp; 150 } else 151 tuser = pwd->pw_name; 152 if ((rmt = getenv("RMT")) == NULL) 153 rmt = _PATH_RMT; 154 msg("%s", ""); 155 #ifdef KERBEROS 156 if (dokerberos) 157 rmtape = krcmd(&rmtpeer, sp->s_port, tuser, rmt, &errfd, NULL); 158 else 159 #endif 160 rmtape = rcmd(&rmtpeer, (u_short)sp->s_port, pwd->pw_name, 161 tuser, rmt, &errfd); 162 if (rmtape < 0) { 163 msg("login to %s as %s failed.\n", rmtpeer, tuser); 164 return; 165 } 166 fprintf(stderr, "Connection to %s established.\n", rmtpeer); 167 size = ntrec * TP_BSIZE; 168 if (size > 60 * 1024) /* XXX */ 169 size = 60 * 1024; 170 /* Leave some space for rmt request/response protocol */ 171 size += 2 * 1024; 172 while (size > TP_BSIZE && 173 setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0) 174 size -= TP_BSIZE; 175 setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size)); 176 throughput = IPTOS_THROUGHPUT; 177 if (setsockopt(rmtape, IPPROTO_IP, IP_TOS, 178 &throughput, sizeof(throughput)) < 0) 179 perror("IP_TOS:IPTOS_THROUGHPUT setsockopt"); 180 on = 1; 181 if (setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0) 182 perror("TCP_NODELAY setsockopt"); 183 } 184 185 static int 186 okname(char *cp0) 187 { 188 char *cp; 189 int c; 190 191 for (cp = cp0; *cp; cp++) { 192 c = *cp; 193 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) { 194 msg("invalid user name %s\n", cp0); 195 return (0); 196 } 197 } 198 return (1); 199 } 200 201 int 202 rmtopen(const char *rtape, int mode) 203 { 204 char buf[256]; 205 206 snprintf(buf, sizeof (buf), "O%.226s\n%d\n", rtape, mode); 207 rmtstate = TS_OPEN; 208 return (rmtcall(rtape, buf)); 209 } 210 211 void 212 rmtclose(void) 213 { 214 215 if (rmtstate != TS_OPEN) 216 return; 217 rmtcall("close", "C\n"); 218 rmtstate = TS_CLOSED; 219 } 220 221 #ifdef RRESTORE 222 int 223 rmtread(char *buf, int count) 224 { 225 char line[30]; 226 int n, i, cc; 227 228 snprintf(line, sizeof (line), "R%d\n", count); 229 n = rmtcall("read", line); 230 if (n < 0) 231 /* rmtcall() properly sets errno for us on errors. */ 232 return (n); 233 for (i = 0; i < n; i += cc) { 234 cc = read(rmtape, buf+i, n - i); 235 if (cc <= 0) 236 rmtconnaborted(0); 237 } 238 return (n); 239 } 240 241 int 242 rmtseek(int offset, int pos) 243 { 244 char line[80]; 245 246 snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos); 247 return (rmtcall("seek", line)); 248 } 249 250 int 251 rmtioctl(int cmd, int count) 252 { 253 char buf[256]; 254 255 if (count < 0) 256 return (-1); 257 snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count); 258 return (rmtcall("ioctl", buf)); 259 } 260 #endif /* RRESTORE */ 261 262 int 263 rmtwrite(const void *buf, int count) 264 { 265 char line[30]; 266 267 snprintf(line, sizeof (line), "W%d\n", count); 268 write(rmtape, line, strlen(line)); 269 write(rmtape, buf, count); 270 return (rmtreply("write")); 271 } 272 273 static int 274 rmtcall(const char *cmd, const char *buf) 275 { 276 ssize_t len = (ssize_t)strlen(buf); 277 278 if (write(rmtape, buf, len) != len) 279 rmtconnaborted(0); 280 return (rmtreply(cmd)); 281 } 282 283 static int 284 rmtreply(const char *cmd) 285 { 286 char *cp; 287 char code[30], emsg[BUFSIZ]; 288 289 rmtgets(code, sizeof (code)); 290 if (*code == 'E' || *code == 'F') { 291 rmtgets(emsg, sizeof (emsg)); 292 msg("%s: %s", cmd, emsg); 293 errno = atoi(code + 1); 294 if (*code == 'F') 295 rmtstate = TS_CLOSED; 296 return (-1); 297 } 298 if (*code != 'A') { 299 /* Kill trailing newline */ 300 cp = code + strlen(code); 301 if (cp > code && *--cp == '\n') 302 *cp = '\0'; 303 304 msg("Protocol to remote tape server botched (code \"%s\").\n", 305 code); 306 rmtconnaborted(0); 307 } 308 return (atoi(code + 1)); 309 } 310 311 int 312 rmtgetb(void) 313 { 314 char c; 315 316 if (read(rmtape, &c, 1) != 1) 317 rmtconnaborted(0); 318 return (c); 319 } 320 321 /* Get a line (guaranteed to have a trailing newline). */ 322 void 323 rmtgets(char *line, int len) 324 { 325 char *cp = line; 326 327 while (len > 1) { 328 *cp = rmtgetb(); 329 if (*cp == '\n') { 330 cp[1] = '\0'; 331 return; 332 } 333 cp++; 334 len--; 335 } 336 *cp = '\0'; 337 msg("Protocol to remote tape server botched.\n"); 338 msg("(rmtgets got \"%s\").\n", line); 339 rmtconnaborted(0); 340 } 341