1 /* $OpenBSD: dumprmt.c,v 1.32 2023/03/08 04:43:06 guenther 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 84 int 85 rmthost(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 rmtpeer = host; 94 signal(SIGPIPE, rmtconnaborted); 95 rmtgetconn(); 96 if (rmtape < 0) 97 return (0); 98 return (1); 99 } 100 101 static void 102 rmtconnaborted(int signo) 103 { 104 /* XXX signal race */ 105 errx(X_ABORT, "Lost connection to remote host."); 106 } 107 108 void 109 rmtgetconn(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 } 159 160 static int 161 okname(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 } 175 176 int 177 rmtopen(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 } 185 186 void 187 rmtclose(void) 188 { 189 190 if (rmtstate != TS_OPEN) 191 return; 192 rmtcall("close", "C\n"); 193 rmtstate = TS_CLOSED; 194 } 195 196 int 197 rmtread(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 } 216 217 int 218 rmtwrite(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 } 227 228 int 229 rmtseek(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 } 236 237 int 238 rmtioctl(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 } 247 248 static int 249 rmtcall(char *cmd, char *buf) 250 { 251 252 if (write(rmtape, buf, strlen(buf)) != strlen(buf)) 253 rmtconnaborted(0); 254 return (rmtreply(cmd)); 255 } 256 257 static int 258 rmtreply(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 } 284 285 int 286 rmtgetb(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). */ 296 void 297 rmtgets(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