1 /* $OpenBSD: dumprmt.c,v 1.30 2019/06/28 13:32:43 deraadt 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 63 static int rmtstate = TS_CLOSED; 64 static int rmtape; 65 static char *rmtpeer; 66 67 static int okname(char *); 68 static int rmtcall(char *, char *); 69 static void rmtconnaborted(int); 70 static int rmtgetb(void); 71 static void rmtgetconn(void); 72 static void rmtgets(char *, int); 73 static int rmtreply(char *); 74 75 int rmthost(char *host); 76 int rmtopen(char *tape, int mode); 77 int rmtread(char *buf, int count); 78 int rmtwrite(char *buf, int count); 79 int rmtseek(int offset, int pos); 80 int rmtioctl(int cmd, int count); 81 void rmtclose(void); 82 83 extern int ntrec; /* blocking factor on tape */ 84 85 int 86 rmthost(char *host) 87 { 88 int len = strlen(host) + 1; 89 90 rmtpeer = malloc(len); 91 if (rmtpeer) 92 strlcpy(rmtpeer, host, len); 93 else 94 rmtpeer = host; 95 signal(SIGPIPE, rmtconnaborted); 96 rmtgetconn(); 97 if (rmtape < 0) 98 return (0); 99 return (1); 100 } 101 102 /* ARGSUSED */ 103 static void 104 rmtconnaborted(int signo) 105 { 106 /* XXX signal race */ 107 errx(X_ABORT, "Lost connection to remote host."); 108 } 109 110 void 111 rmtgetconn(void) 112 { 113 char *cp; 114 static struct servent *sp = NULL; 115 static struct passwd *pwd = NULL; 116 static int on = 1; 117 char *tuser, *name; 118 int size; 119 int maxseg; 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, "malloc"); 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, sp->s_port, name, tuser, _PATH_RMT, NULL); 141 (void)free(name); 142 if (rmtape < 0) 143 return; 144 145 size = ntrec * TP_BSIZE; 146 if (size > 60 * 1024) /* XXX */ 147 size = 60 * 1024; 148 /* Leave some space for rmt request/response protocol */ 149 size += 2 * 1024; 150 while (size > TP_BSIZE && 151 setsockopt(rmtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof(size)) == -1) 152 size -= TP_BSIZE; 153 (void)setsockopt(rmtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof(size)); 154 155 maxseg = 1024; 156 (void)setsockopt(rmtape, IPPROTO_TCP, TCP_MAXSEG, &maxseg, 157 sizeof(maxseg)); 158 159 (void) setsockopt(rmtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)); 160 } 161 162 static int 163 okname(char *cp0) 164 { 165 char *cp; 166 unsigned char c; 167 168 for (cp = cp0; *cp; cp++) { 169 c = *cp; 170 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) { 171 warnx("invalid user name: %s", cp0); 172 return (0); 173 } 174 } 175 return (1); 176 } 177 178 int 179 rmtopen(char *tape, int mode) 180 { 181 char buf[256]; 182 183 (void)snprintf(buf, sizeof(buf), "O%s\n%d\n", tape, mode); 184 rmtstate = TS_OPEN; 185 return (rmtcall(tape, buf)); 186 } 187 188 void 189 rmtclose(void) 190 { 191 192 if (rmtstate != TS_OPEN) 193 return; 194 rmtcall("close", "C\n"); 195 rmtstate = TS_CLOSED; 196 } 197 198 int 199 rmtread(char *buf, int count) 200 { 201 char line[30]; 202 int n, i, cc; 203 204 (void)snprintf(line, sizeof(line), "R%d\n", count); 205 n = rmtcall("read", line); 206 if (n < 0) { 207 errno = n; 208 return (-1); 209 } 210 for (i = 0; i < n; i += cc) { 211 cc = read(rmtape, buf+i, n - i); 212 if (cc <= 0) { 213 rmtconnaborted(0); 214 } 215 } 216 return (n); 217 } 218 219 int 220 rmtwrite(char *buf, int count) 221 { 222 char line[30]; 223 224 (void)snprintf(line, sizeof(line), "W%d\n", count); 225 write(rmtape, line, strlen(line)); 226 write(rmtape, buf, count); 227 return (rmtreply("write")); 228 } 229 230 int 231 rmtseek(int offset, int pos) 232 { 233 char line[80]; 234 235 (void)snprintf(line, sizeof(line), "L%d\n%d\n", offset, pos); 236 return (rmtcall("seek", line)); 237 } 238 239 int 240 rmtioctl(int cmd, int count) 241 { 242 char buf[256]; 243 244 if (count < 0) 245 return (-1); 246 (void)snprintf(buf, sizeof(buf), "I%d\n%d\n", cmd, count); 247 return (rmtcall("ioctl", buf)); 248 } 249 250 static int 251 rmtcall(char *cmd, char *buf) 252 { 253 254 if (write(rmtape, buf, strlen(buf)) != strlen(buf)) 255 rmtconnaborted(0); 256 return (rmtreply(cmd)); 257 } 258 259 static int 260 rmtreply(char *cmd) 261 { 262 char *cp; 263 char code[30], emsg[BUFSIZ]; 264 265 rmtgets(code, sizeof(code)); 266 if (*code == 'E' || *code == 'F') { 267 rmtgets(emsg, sizeof(emsg)); 268 msg("%s: %s", cmd, emsg); 269 errno = atoi(&code[1]); 270 if (*code == 'F') 271 rmtstate = TS_CLOSED; 272 return (-1); 273 } 274 if (*code != 'A') { 275 /* Kill trailing newline */ 276 cp = code + strlen(code); 277 if (cp > code && *--cp == '\n') 278 *cp = '\0'; 279 280 msg("Protocol to remote tape server botched (code \"%s\").\n", 281 code); 282 rmtconnaborted(0); 283 } 284 return (atoi(code + 1)); 285 } 286 287 int 288 rmtgetb(void) 289 { 290 char c; 291 292 if (read(rmtape, &c, 1) != 1) 293 rmtconnaborted(0); 294 return (c); 295 } 296 297 /* Get a line (guaranteed to have a trailing newline). */ 298 void 299 rmtgets(char *line, int len) 300 { 301 char *cp = line; 302 303 while (len > 1) { 304 *cp = rmtgetb(); 305 if (*cp == '\n') { 306 cp[1] = '\0'; 307 return; 308 } 309 cp++; 310 len--; 311 } 312 *cp = '\0'; 313 msg("Protocol to remote tape server botched.\n"); 314 msg("(rmtgets got \"%s\").\n", line); 315 rmtconnaborted(0); 316 } 317