1/* $OpenBSD: dumprmt.c,v 1.33 2023/12/21 08:01:21 otto Exp $ */ 2/* $NetBSD: dumprmt.c,v 1.17 1997/06/05 16:10:47 mrg Exp $ */ 3 4/*- 5 * Copyright (c) 1980, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#include <sys/param.h> /* MAXBSIZE */ 34#include <sys/mtio.h> 35#include <sys/ioctl.h> 36#include <sys/socket.h> 37#include <sys/time.h> 38#include <ufs/ufs/dinode.h> 39 40#include <netinet/in.h> 41#include <netinet/tcp.h> 42 43#include <protocols/dumprestore.h> 44 45#include <ctype.h> 46#include <err.h> 47#include <netdb.h> 48#include <errno.h> 49#include <pwd.h> 50#include <signal.h> 51#include <stdio.h> 52#include <stdlib.h> 53#include <string.h> 54#include <unistd.h> 55#include <limits.h> 56 57#include "pathnames.h" 58#include "dump.h" 59 60#define TS_CLOSED 0 61#define TS_OPEN 1 62 63static int rmtstate = TS_CLOSED; 64static int rmtape; 65static char *rmtpeer; 66 67static int okname(char *); 68static int rmtcall(char *, char *); 69static void rmtconnaborted(int); 70static int rmtgetb(void); 71static void rmtgetconn(void); 72static void rmtgets(char *, int); 73static int rmtreply(char *); 74 75int rmthost(char *host); 76int rmtopen(char *tape, int mode); 77int rmtread(char *buf, int count); 78int rmtwrite(char *buf, int count); 79int rmtseek(int offset, int pos); 80int rmtioctl(int cmd, int count); 81void rmtclose(void); 82 83 84int 85rmthost(char *host) 86{ 87 int len = strlen(host) + 1; 88 89 rmtpeer = malloc(len); 90 if (rmtpeer) 91 strlcpy(rmtpeer, host, len); 92 else 93 return (0); 94 signal(SIGPIPE, rmtconnaborted); 95 rmtgetconn(); 96 if (rmtape < 0) 97 return (0); 98 return (1); 99} 100 101static void 102rmtconnaborted(int signo) 103{ 104 /* XXX signal race */ 105 errx(X_ABORT, "Lost connection to remote host."); 106} 107 108void 109rmtgetconn(void) 110{ 111 char *cp; 112 static struct servent *sp = NULL; 113 static struct passwd *pwd = NULL; 114 static int on = 1; 115 char *tuser, *name; 116 int size; 117 int maxseg; 118 119 if (sp == NULL) { 120 sp = getservbyname("shell", "tcp"); 121 if (sp == NULL) 122 errx(X_STARTUP, "shell/tcp: unknown service"); 123 pwd = getpwuid(getuid()); 124 if (pwd == NULL) 125 errx(X_STARTUP, "who are you?"); 126 } 127 if ((name = strdup(pwd->pw_name)) == NULL) 128 err(X_STARTUP, "malloc"); 129 if ((cp = strchr(rmtpeer, '@')) != NULL) { 130 tuser = rmtpeer; 131 *cp = '\0'; 132 if (!okname(tuser)) 133 exit(X_STARTUP); 134 rmtpeer = ++cp; 135 } else 136 tuser = name; 137 138 rmtape = rcmd(&rmtpeer, sp->s_port, name, tuser, _PATH_RMT, NULL); 139 (void)free(name); 140 if (rmtape < 0) 141 return; 142 143 size = ntrec * TP_BSIZE; 144 if (size > 60 * 1024) /* XXX */ 145 size = 60 * 1024; 146 /* Leave some space for rmt request/response protocol */ 147 size += 2 * 1024; 148 while (size > TP_BSIZE && 149 setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size)) == -1) 150 size -= TP_BSIZE; 151 (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)); 152 153 maxseg = 1024; 154 (void)setsockopt(rmtape, IPPROTO_TCP, TCP_MAXSEG, &maxseg, 155 sizeof(maxseg)); 156 157 (void) setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)); 158} 159 160static int 161okname(char *cp0) 162{ 163 char *cp; 164 unsigned char c; 165 166 for (cp = cp0; *cp; cp++) { 167 c = *cp; 168 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) { 169 warnx("invalid user name: %s", cp0); 170 return (0); 171 } 172 } 173 return (1); 174} 175 176int 177rmtopen(char *tape, int mode) 178{ 179 char buf[256]; 180 181 (void)snprintf(buf, sizeof(buf), "O%s\n%d\n", tape, mode); 182 rmtstate = TS_OPEN; 183 return (rmtcall(tape, buf)); 184} 185 186void 187rmtclose(void) 188{ 189 190 if (rmtstate != TS_OPEN) 191 return; 192 rmtcall("close", "C\n"); 193 rmtstate = TS_CLOSED; 194} 195 196int 197rmtread(char *buf, int count) 198{ 199 char line[30]; 200 int n, i, cc; 201 202 (void)snprintf(line, sizeof(line), "R%d\n", count); 203 n = rmtcall("read", line); 204 if (n < 0) { 205 errno = n; 206 return (-1); 207 } 208 for (i = 0; i < n; i += cc) { 209 cc = read(rmtape, buf+i, n - i); 210 if (cc <= 0) { 211 rmtconnaborted(0); 212 } 213 } 214 return (n); 215} 216 217int 218rmtwrite(char *buf, int count) 219{ 220 char line[30]; 221 222 (void)snprintf(line, sizeof(line), "W%d\n", count); 223 write(rmtape, line, strlen(line)); 224 write(rmtape, buf, count); 225 return (rmtreply("write")); 226} 227 228int 229rmtseek(int offset, int pos) 230{ 231 char line[80]; 232 233 (void)snprintf(line, sizeof(line), "L%d\n%d\n", offset, pos); 234 return (rmtcall("seek", line)); 235} 236 237int 238rmtioctl(int cmd, int count) 239{ 240 char buf[256]; 241 242 if (count < 0) 243 return (-1); 244 (void)snprintf(buf, sizeof(buf), "I%d\n%d\n", cmd, count); 245 return (rmtcall("ioctl", buf)); 246} 247 248static int 249rmtcall(char *cmd, char *buf) 250{ 251 252 if (write(rmtape, buf, strlen(buf)) != strlen(buf)) 253 rmtconnaborted(0); 254 return (rmtreply(cmd)); 255} 256 257static int 258rmtreply(char *cmd) 259{ 260 char *cp; 261 char code[30], emsg[BUFSIZ]; 262 263 rmtgets(code, sizeof(code)); 264 if (*code == 'E' || *code == 'F') { 265 rmtgets(emsg, sizeof(emsg)); 266 msg("%s: %s", cmd, emsg); 267 errno = atoi(&code[1]); 268 if (*code == 'F') 269 rmtstate = TS_CLOSED; 270 return (-1); 271 } 272 if (*code != 'A') { 273 /* Kill trailing newline */ 274 cp = code + strlen(code); 275 if (cp > code && *--cp == '\n') 276 *cp = '\0'; 277 278 msg("Protocol to remote tape server botched (code \"%s\").\n", 279 code); 280 rmtconnaborted(0); 281 } 282 return (atoi(code + 1)); 283} 284 285int 286rmtgetb(void) 287{ 288 char c; 289 290 if (read(rmtape, &c, 1) != 1) 291 rmtconnaborted(0); 292 return (c); 293} 294 295/* Get a line (guaranteed to have a trailing newline). */ 296void 297rmtgets(char *line, int len) 298{ 299 char *cp = line; 300 301 while (len > 1) { 302 *cp = rmtgetb(); 303 if (*cp == '\n') { 304 cp[1] = '\0'; 305 return; 306 } 307 cp++; 308 len--; 309 } 310 *cp = '\0'; 311 msg("Protocol to remote tape server botched.\n"); 312 msg("(rmtgets got \"%s\").\n", line); 313 rmtconnaborted(0); 314} 315