1 /* 2 * Copyright (c) 1983, 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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if 0 35 #ifndef lint 36 static char sccsid[] = "@(#)tftp.c 8.1 (Berkeley) 6/6/93"; 37 #endif /* not lint */ 38 #endif 39 40 #include <sys/cdefs.h> 41 __FBSDID("$FreeBSD$"); 42 43 /* Many bug fixes are from Jim Guyton <guyton@rand-unix> */ 44 45 /* 46 * TFTP User Program -- Protocol Machines 47 */ 48 #include <sys/types.h> 49 #include <sys/socket.h> 50 #include <sys/time.h> 51 52 #include <netinet/in.h> 53 54 #include <arpa/inet.h> 55 #include <arpa/tftp.h> 56 57 #include <err.h> 58 #include <errno.h> 59 #include <setjmp.h> 60 #include <signal.h> 61 #include <stdio.h> 62 #include <string.h> 63 #include <unistd.h> 64 #include <netdb.h> 65 66 #include "extern.h" 67 #include "tftpsubs.h" 68 69 extern struct sockaddr_storage peeraddr; /* filled in by main */ 70 extern int f; /* the opened socket */ 71 extern int trace; 72 extern int verbose; 73 extern int rexmtval; 74 extern int maxtimeout; 75 extern volatile int txrx_error; 76 77 #define PKTSIZE SEGSIZE+4 78 char ackbuf[PKTSIZE]; 79 int timeout; 80 jmp_buf toplevel; 81 jmp_buf timeoutbuf; 82 83 static void nak(int, struct sockaddr *); 84 static int makerequest(int, const char *, struct tftphdr *, const char *); 85 static void printstats(const char *, unsigned long); 86 static void startclock(void); 87 static void stopclock(void); 88 static void timer(int); 89 static void tpacket(const char *, struct tftphdr *, int); 90 static int cmpport(struct sockaddr *, struct sockaddr *); 91 92 /* 93 * Send the requested file. 94 */ 95 void 96 xmitfile(fd, name, mode) 97 int fd; 98 char *name; 99 char *mode; 100 { 101 struct tftphdr *ap; /* data and ack packets */ 102 struct tftphdr *dp; 103 int n; 104 volatile unsigned short block; 105 volatile int size, convert; 106 volatile unsigned long amount; 107 struct sockaddr_storage from; 108 socklen_t fromlen; 109 FILE *file; 110 struct sockaddr_storage peer; 111 struct sockaddr_storage serv; /* valid server port number */ 112 113 startclock(); /* start stat's clock */ 114 dp = r_init(); /* reset fillbuf/read-ahead code */ 115 ap = (struct tftphdr *)ackbuf; 116 file = fdopen(fd, "r"); 117 convert = !strcmp(mode, "netascii"); 118 block = 0; 119 amount = 0; 120 memcpy(&peer, &peeraddr, peeraddr.ss_len); 121 memset(&serv, 0, sizeof(serv)); 122 123 signal(SIGALRM, timer); 124 do { 125 if (block == 0) 126 size = makerequest(WRQ, name, dp, mode) - 4; 127 else { 128 /* size = read(fd, dp->th_data, SEGSIZE); */ 129 size = readit(file, &dp, convert); 130 if (size < 0) { 131 nak(errno + 100, (struct sockaddr *)&peer); 132 break; 133 } 134 dp->th_opcode = htons((u_short)DATA); 135 dp->th_block = htons((u_short)block); 136 } 137 timeout = 0; 138 (void) setjmp(timeoutbuf); 139 send_data: 140 if (trace) 141 tpacket("sent", dp, size + 4); 142 n = sendto(f, dp, size + 4, 0, 143 (struct sockaddr *)&peer, peer.ss_len); 144 if (n != size + 4) { 145 warn("sendto"); 146 goto abort; 147 } 148 read_ahead(file, convert); 149 for ( ; ; ) { 150 alarm(rexmtval); 151 do { 152 fromlen = sizeof(from); 153 n = recvfrom(f, ackbuf, sizeof(ackbuf), 0, 154 (struct sockaddr *)&from, &fromlen); 155 } while (n <= 0); 156 alarm(0); 157 if (n < 0) { 158 warn("recvfrom"); 159 goto abort; 160 } 161 if (!serv.ss_family) 162 serv = from; 163 else if (!cmpport((struct sockaddr *)&serv, 164 (struct sockaddr *)&from)) { 165 warn("server port mismatch"); 166 goto abort; 167 } 168 peer = from; 169 if (trace) 170 tpacket("received", ap, n); 171 /* should verify packet came from server */ 172 ap->th_opcode = ntohs(ap->th_opcode); 173 ap->th_block = ntohs(ap->th_block); 174 if (ap->th_opcode == ERROR) { 175 printf("Error code %d: %s\n", ap->th_code, 176 ap->th_msg); 177 txrx_error = 1; 178 goto abort; 179 } 180 if (ap->th_opcode == ACK) { 181 int j; 182 183 if (ap->th_block == block) { 184 break; 185 } 186 /* On an error, try to synchronize 187 * both sides. 188 */ 189 j = synchnet(f); 190 if (j && trace) { 191 printf("discarded %d packets\n", 192 j); 193 } 194 if (ap->th_block == (block-1)) { 195 goto send_data; 196 } 197 } 198 } 199 if (block > 0) 200 amount += size; 201 block++; 202 } while (size == SEGSIZE || block == 1); 203 abort: 204 fclose(file); 205 stopclock(); 206 if (amount > 0) 207 printstats("Sent", amount); 208 txrx_error = 1; 209 } 210 211 /* 212 * Receive a file. 213 */ 214 void 215 recvfile(fd, name, mode) 216 int fd; 217 char *name; 218 char *mode; 219 { 220 struct tftphdr *ap; 221 struct tftphdr *dp; 222 int n; 223 volatile unsigned short block; 224 volatile int size, firsttrip; 225 volatile unsigned long amount; 226 struct sockaddr_storage from; 227 socklen_t fromlen; 228 FILE *file; 229 volatile int convert; /* true if converting crlf -> lf */ 230 struct sockaddr_storage peer; 231 struct sockaddr_storage serv; /* valid server port number */ 232 233 startclock(); 234 dp = w_init(); 235 ap = (struct tftphdr *)ackbuf; 236 file = fdopen(fd, "w"); 237 convert = !strcmp(mode, "netascii"); 238 block = 1; 239 firsttrip = 1; 240 amount = 0; 241 memcpy(&peer, &peeraddr, peeraddr.ss_len); 242 memset(&serv, 0, sizeof(serv)); 243 244 signal(SIGALRM, timer); 245 do { 246 if (firsttrip) { 247 size = makerequest(RRQ, name, ap, mode); 248 firsttrip = 0; 249 } else { 250 ap->th_opcode = htons((u_short)ACK); 251 ap->th_block = htons((u_short)(block)); 252 size = 4; 253 block++; 254 } 255 timeout = 0; 256 (void) setjmp(timeoutbuf); 257 send_ack: 258 if (trace) 259 tpacket("sent", ap, size); 260 if (sendto(f, ackbuf, size, 0, (struct sockaddr *)&peer, 261 peer.ss_len) != size) { 262 alarm(0); 263 warn("sendto"); 264 goto abort; 265 } 266 write_behind(file, convert); 267 for ( ; ; ) { 268 alarm(rexmtval); 269 do { 270 fromlen = sizeof(from); 271 n = recvfrom(f, dp, PKTSIZE, 0, 272 (struct sockaddr *)&from, &fromlen); 273 } while (n <= 0); 274 alarm(0); 275 if (n < 0) { 276 warn("recvfrom"); 277 goto abort; 278 } 279 if (!serv.ss_family) 280 serv = from; 281 else if (!cmpport((struct sockaddr *)&serv, 282 (struct sockaddr *)&from)) { 283 warn("server port mismatch"); 284 goto abort; 285 } 286 peer = from; 287 if (trace) 288 tpacket("received", dp, n); 289 /* should verify client address */ 290 dp->th_opcode = ntohs(dp->th_opcode); 291 dp->th_block = ntohs(dp->th_block); 292 if (dp->th_opcode == ERROR) { 293 printf("Error code %d: %s\n", dp->th_code, 294 dp->th_msg); 295 txrx_error = 1; 296 goto abort; 297 } 298 if (dp->th_opcode == DATA) { 299 int j; 300 301 if (dp->th_block == block) { 302 break; /* have next packet */ 303 } 304 /* On an error, try to synchronize 305 * both sides. 306 */ 307 j = synchnet(f); 308 if (j && trace) { 309 printf("discarded %d packets\n", j); 310 } 311 if (dp->th_block == (block-1)) { 312 goto send_ack; /* resend ack */ 313 } 314 } 315 } 316 /* size = write(fd, dp->th_data, n - 4); */ 317 size = writeit(file, &dp, n - 4, convert); 318 if (size < 0) { 319 nak(errno + 100, (struct sockaddr *)&peer); 320 break; 321 } 322 amount += size; 323 } while (size == SEGSIZE); 324 abort: /* ok to ack, since user */ 325 ap->th_opcode = htons((u_short)ACK); /* has seen err msg */ 326 ap->th_block = htons((u_short)block); 327 (void) sendto(f, ackbuf, 4, 0, (struct sockaddr *)&peer, 328 peer.ss_len); 329 write_behind(file, convert); /* flush last buffer */ 330 fclose(file); 331 stopclock(); 332 if (amount > 0) 333 printstats("Received", amount); 334 txrx_error = 1; 335 } 336 337 static int 338 makerequest(request, name, tp, mode) 339 int request; 340 const char *name; 341 struct tftphdr *tp; 342 const char *mode; 343 { 344 char *cp; 345 346 tp->th_opcode = htons((u_short)request); 347 cp = tp->th_stuff; 348 strcpy(cp, name); 349 cp += strlen(name); 350 *cp++ = '\0'; 351 strcpy(cp, mode); 352 cp += strlen(mode); 353 *cp++ = '\0'; 354 return (cp - (char *)tp); 355 } 356 357 struct errmsg { 358 int e_code; 359 const char *e_msg; 360 } errmsgs[] = { 361 { EUNDEF, "Undefined error code" }, 362 { ENOTFOUND, "File not found" }, 363 { EACCESS, "Access violation" }, 364 { ENOSPACE, "Disk full or allocation exceeded" }, 365 { EBADOP, "Illegal TFTP operation" }, 366 { EBADID, "Unknown transfer ID" }, 367 { EEXISTS, "File already exists" }, 368 { ENOUSER, "No such user" }, 369 { -1, 0 } 370 }; 371 372 /* 373 * Send a nak packet (error message). 374 * Error code passed in is one of the 375 * standard TFTP codes, or a UNIX errno 376 * offset by 100. 377 */ 378 static void 379 nak(error, peer) 380 int error; 381 struct sockaddr *peer; 382 { 383 struct errmsg *pe; 384 struct tftphdr *tp; 385 int length; 386 387 tp = (struct tftphdr *)ackbuf; 388 tp->th_opcode = htons((u_short)ERROR); 389 tp->th_code = htons((u_short)error); 390 for (pe = errmsgs; pe->e_code >= 0; pe++) 391 if (pe->e_code == error) 392 break; 393 if (pe->e_code < 0) { 394 pe->e_msg = strerror(error - 100); 395 tp->th_code = EUNDEF; 396 } 397 strcpy(tp->th_msg, pe->e_msg); 398 length = strlen(pe->e_msg) + 4; 399 if (trace) 400 tpacket("sent", tp, length); 401 if (sendto(f, ackbuf, length, 0, peer, peer->sa_len) != length) 402 warn("nak"); 403 } 404 405 static void 406 tpacket(s, tp, n) 407 const char *s; 408 struct tftphdr *tp; 409 int n; 410 { 411 static const char *opcodes[] = 412 { "#0", "RRQ", "WRQ", "DATA", "ACK", "ERROR" }; 413 char *cp, *file; 414 u_short op = ntohs(tp->th_opcode); 415 416 if (op < RRQ || op > ERROR) 417 printf("%s opcode=%x ", s, op); 418 else 419 printf("%s %s ", s, opcodes[op]); 420 switch (op) { 421 422 case RRQ: 423 case WRQ: 424 n -= 2; 425 file = cp = tp->th_stuff; 426 cp = index(cp, '\0'); 427 printf("<file=%s, mode=%s>\n", file, cp + 1); 428 break; 429 430 case DATA: 431 printf("<block=%d, %d bytes>\n", ntohs(tp->th_block), n - 4); 432 break; 433 434 case ACK: 435 printf("<block=%d>\n", ntohs(tp->th_block)); 436 break; 437 438 case ERROR: 439 printf("<code=%d, msg=%s>\n", ntohs(tp->th_code), tp->th_msg); 440 break; 441 } 442 } 443 444 struct timeval tstart; 445 struct timeval tstop; 446 447 static void 448 startclock() 449 { 450 451 (void)gettimeofday(&tstart, NULL); 452 } 453 454 static void 455 stopclock() 456 { 457 458 (void)gettimeofday(&tstop, NULL); 459 } 460 461 static void 462 printstats(direction, amount) 463 const char *direction; 464 unsigned long amount; 465 { 466 double delta; 467 /* compute delta in 1/10's second units */ 468 delta = ((tstop.tv_sec*10.)+(tstop.tv_usec/100000)) - 469 ((tstart.tv_sec*10.)+(tstart.tv_usec/100000)); 470 delta = delta/10.; /* back to seconds */ 471 printf("%s %ld bytes in %.1f seconds", direction, amount, delta); 472 if (verbose) 473 printf(" [%.0f bits/sec]", (amount*8.)/delta); 474 putchar('\n'); 475 } 476 477 static void 478 timer(sig) 479 int sig __unused; 480 { 481 482 timeout += rexmtval; 483 if (timeout >= maxtimeout) { 484 printf("Transfer timed out.\n"); 485 longjmp(toplevel, -1); 486 } 487 txrx_error = 1; 488 longjmp(timeoutbuf, 1); 489 } 490 491 static int 492 cmpport(sa, sb) 493 struct sockaddr *sa; 494 struct sockaddr *sb; 495 { 496 char a[NI_MAXSERV], b[NI_MAXSERV]; 497 498 if (getnameinfo(sa, sa->sa_len, NULL, 0, a, sizeof(a), NI_NUMERICSERV)) 499 return 0; 500 if (getnameinfo(sb, sb->sa_len, NULL, 0, b, sizeof(b), NI_NUMERICSERV)) 501 return 0; 502 if (strcmp(a, b) != 0) 503 return 0; 504 505 return 1; 506 } 507