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, const 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(const struct sockaddr *, const struct sockaddr *); 91 92 /* 93 * Send the requested file. 94 */ 95 void 96 xmitfile(int fd, const char *name, const char *mode) 97 { 98 struct tftphdr *ap; /* data and ack packets */ 99 struct tftphdr *dp; 100 int n; 101 volatile unsigned short block; 102 volatile int size, convert; 103 volatile unsigned long amount; 104 struct sockaddr_storage from; 105 socklen_t fromlen; 106 FILE *file; 107 struct sockaddr_storage peer; 108 struct sockaddr_storage serv; /* valid server port number */ 109 110 startclock(); /* start stat's clock */ 111 dp = r_init(); /* reset fillbuf/read-ahead code */ 112 ap = (struct tftphdr *)ackbuf; 113 file = fdopen(fd, "r"); 114 convert = !strcmp(mode, "netascii"); 115 block = 0; 116 amount = 0; 117 memcpy(&peer, &peeraddr, peeraddr.ss_len); 118 memset(&serv, 0, sizeof(serv)); 119 120 signal(SIGALRM, timer); 121 do { 122 if (block == 0) 123 size = makerequest(WRQ, name, dp, mode) - 4; 124 else { 125 /* size = read(fd, dp->th_data, SEGSIZE); */ 126 size = readit(file, &dp, convert); 127 if (size < 0) { 128 nak(errno + 100, (struct sockaddr *)&peer); 129 break; 130 } 131 dp->th_opcode = htons((u_short)DATA); 132 dp->th_block = htons((u_short)block); 133 } 134 timeout = 0; 135 (void) setjmp(timeoutbuf); 136 send_data: 137 if (trace) 138 tpacket("sent", dp, size + 4); 139 n = sendto(f, dp, size + 4, 0, 140 (struct sockaddr *)&peer, peer.ss_len); 141 if (n != size + 4) { 142 warn("sendto"); 143 txrx_error = 1; 144 goto abort; 145 } 146 read_ahead(file, convert); 147 for ( ; ; ) { 148 alarm(rexmtval); 149 do { 150 fromlen = sizeof(from); 151 n = recvfrom(f, ackbuf, sizeof(ackbuf), 0, 152 (struct sockaddr *)&from, &fromlen); 153 } while (n <= 0); 154 alarm(0); 155 if (n < 0) { 156 warn("recvfrom"); 157 txrx_error = 1; 158 goto abort; 159 } 160 if (!serv.ss_family) 161 serv = from; 162 else if (!cmpport((struct sockaddr *)&serv, 163 (struct sockaddr *)&from)) { 164 warn("server port mismatch"); 165 txrx_error = 1; 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 } 209 210 /* 211 * Receive a file. 212 */ 213 void 214 recvfile(int fd, const char *name, const char *mode) 215 { 216 struct tftphdr *ap; 217 struct tftphdr *dp; 218 int n; 219 volatile unsigned short block; 220 volatile int size, firsttrip; 221 volatile unsigned long amount; 222 struct sockaddr_storage from; 223 socklen_t fromlen; 224 FILE *file; 225 volatile int convert; /* true if converting crlf -> lf */ 226 struct sockaddr_storage peer; 227 struct sockaddr_storage serv; /* valid server port number */ 228 229 startclock(); 230 dp = w_init(); 231 ap = (struct tftphdr *)ackbuf; 232 file = fdopen(fd, "w"); 233 convert = !strcmp(mode, "netascii"); 234 block = 1; 235 firsttrip = 1; 236 amount = 0; 237 memcpy(&peer, &peeraddr, peeraddr.ss_len); 238 memset(&serv, 0, sizeof(serv)); 239 240 signal(SIGALRM, timer); 241 do { 242 if (firsttrip) { 243 size = makerequest(RRQ, name, ap, mode); 244 firsttrip = 0; 245 } else { 246 ap->th_opcode = htons((u_short)ACK); 247 ap->th_block = htons((u_short)(block)); 248 size = 4; 249 block++; 250 } 251 timeout = 0; 252 (void) setjmp(timeoutbuf); 253 send_ack: 254 if (trace) 255 tpacket("sent", ap, size); 256 if (sendto(f, ackbuf, size, 0, (struct sockaddr *)&peer, 257 peer.ss_len) != size) { 258 alarm(0); 259 warn("sendto"); 260 txrx_error = 1; 261 goto abort; 262 } 263 write_behind(file, convert); 264 for ( ; ; ) { 265 alarm(rexmtval); 266 do { 267 fromlen = sizeof(from); 268 n = recvfrom(f, dp, PKTSIZE, 0, 269 (struct sockaddr *)&from, &fromlen); 270 } while (n <= 0); 271 alarm(0); 272 if (n < 0) { 273 warn("recvfrom"); 274 txrx_error = 1; 275 goto abort; 276 } 277 if (!serv.ss_family) 278 serv = from; 279 else if (!cmpport((struct sockaddr *)&serv, 280 (struct sockaddr *)&from)) { 281 warn("server port mismatch"); 282 txrx_error = 1; 283 goto abort; 284 } 285 peer = from; 286 if (trace) 287 tpacket("received", dp, n); 288 /* should verify client address */ 289 dp->th_opcode = ntohs(dp->th_opcode); 290 dp->th_block = ntohs(dp->th_block); 291 if (dp->th_opcode == ERROR) { 292 printf("Error code %d: %s\n", dp->th_code, 293 dp->th_msg); 294 txrx_error = 1; 295 goto abort; 296 } 297 if (dp->th_opcode == DATA) { 298 int j; 299 300 if (dp->th_block == block) { 301 break; /* have next packet */ 302 } 303 /* On an error, try to synchronize 304 * both sides. 305 */ 306 j = synchnet(f); 307 if (j && trace) { 308 printf("discarded %d packets\n", j); 309 } 310 if (dp->th_block == (block-1)) { 311 goto send_ack; /* resend ack */ 312 } 313 } 314 } 315 /* size = write(fd, dp->th_data, n - 4); */ 316 size = writeit(file, &dp, n - 4, convert); 317 if (size < 0) { 318 nak(errno + 100, (struct sockaddr *)&peer); 319 break; 320 } 321 amount += size; 322 } while (size == SEGSIZE); 323 abort: /* ok to ack, since user */ 324 ap->th_opcode = htons((u_short)ACK); /* has seen err msg */ 325 ap->th_block = htons((u_short)block); 326 (void) sendto(f, ackbuf, 4, 0, (struct sockaddr *)&peer, 327 peer.ss_len); 328 write_behind(file, convert); /* flush last buffer */ 329 fclose(file); 330 stopclock(); 331 if (amount > 0) 332 printstats("Received", amount); 333 } 334 335 static int 336 makerequest(int request, const char *name, struct tftphdr *tp, const char *mode) 337 { 338 char *cp; 339 340 tp->th_opcode = htons((u_short)request); 341 cp = tp->th_stuff; 342 strcpy(cp, name); 343 cp += strlen(name); 344 *cp++ = '\0'; 345 strcpy(cp, mode); 346 cp += strlen(mode); 347 *cp++ = '\0'; 348 return (cp - (char *)tp); 349 } 350 351 struct errmsg { 352 int e_code; 353 const char *e_msg; 354 } errmsgs[] = { 355 { EUNDEF, "Undefined error code" }, 356 { ENOTFOUND, "File not found" }, 357 { EACCESS, "Access violation" }, 358 { ENOSPACE, "Disk full or allocation exceeded" }, 359 { EBADOP, "Illegal TFTP operation" }, 360 { EBADID, "Unknown transfer ID" }, 361 { EEXISTS, "File already exists" }, 362 { ENOUSER, "No such user" }, 363 { -1, 0 } 364 }; 365 366 /* 367 * Send a nak packet (error message). 368 * Error code passed in is one of the 369 * standard TFTP codes, or a UNIX errno 370 * offset by 100. 371 */ 372 static void 373 nak(int error, const struct sockaddr *peer) 374 { 375 struct errmsg *pe; 376 struct tftphdr *tp; 377 int length; 378 379 tp = (struct tftphdr *)ackbuf; 380 tp->th_opcode = htons((u_short)ERROR); 381 tp->th_code = htons((u_short)error); 382 for (pe = errmsgs; pe->e_code >= 0; pe++) 383 if (pe->e_code == error) 384 break; 385 if (pe->e_code < 0) { 386 pe->e_msg = strerror(error - 100); 387 tp->th_code = EUNDEF; 388 } 389 strcpy(tp->th_msg, pe->e_msg); 390 length = strlen(pe->e_msg) + 4; 391 if (trace) 392 tpacket("sent", tp, length); 393 if (sendto(f, ackbuf, length, 0, peer, peer->sa_len) != length) 394 warn("nak"); 395 } 396 397 static void 398 tpacket(const char *s, struct tftphdr *tp, int n) 399 { 400 static const char *opcodes[] = 401 { "#0", "RRQ", "WRQ", "DATA", "ACK", "ERROR" }; 402 char *cp, *file; 403 u_short op = ntohs(tp->th_opcode); 404 405 if (op < RRQ || op > ERROR) 406 printf("%s opcode=%x ", s, op); 407 else 408 printf("%s %s ", s, opcodes[op]); 409 switch (op) { 410 411 case RRQ: 412 case WRQ: 413 n -= 2; 414 file = cp = tp->th_stuff; 415 cp = index(cp, '\0'); 416 printf("<file=%s, mode=%s>\n", file, cp + 1); 417 break; 418 419 case DATA: 420 printf("<block=%d, %d bytes>\n", ntohs(tp->th_block), n - 4); 421 break; 422 423 case ACK: 424 printf("<block=%d>\n", ntohs(tp->th_block)); 425 break; 426 427 case ERROR: 428 printf("<code=%d, msg=%s>\n", ntohs(tp->th_code), tp->th_msg); 429 break; 430 } 431 } 432 433 struct timeval tstart; 434 struct timeval tstop; 435 436 static void 437 startclock(void) 438 { 439 440 (void)gettimeofday(&tstart, NULL); 441 } 442 443 static void 444 stopclock(void) 445 { 446 447 (void)gettimeofday(&tstop, NULL); 448 } 449 450 static void 451 printstats(const char *direction, unsigned long amount) 452 { 453 double delta; 454 /* compute delta in 1/10's second units */ 455 delta = ((tstop.tv_sec*10.)+(tstop.tv_usec/100000)) - 456 ((tstart.tv_sec*10.)+(tstart.tv_usec/100000)); 457 delta = delta/10.; /* back to seconds */ 458 printf("%s %ld bytes in %.1f seconds", direction, amount, delta); 459 if (verbose) 460 printf(" [%.0f bits/sec]", (amount*8.)/delta); 461 putchar('\n'); 462 } 463 464 static void 465 timer(int sig __unused) 466 { 467 468 timeout += rexmtval; 469 if (timeout >= maxtimeout) { 470 printf("Transfer timed out.\n"); 471 longjmp(toplevel, -1); 472 } 473 txrx_error = 1; 474 longjmp(timeoutbuf, 1); 475 } 476 477 static int 478 cmpport(const struct sockaddr *sa, const struct sockaddr *sb) 479 { 480 char a[NI_MAXSERV], b[NI_MAXSERV]; 481 482 if (getnameinfo(sa, sa->sa_len, NULL, 0, a, sizeof(a), NI_NUMERICSERV)) 483 return 0; 484 if (getnameinfo(sb, sb->sa_len, NULL, 0, b, sizeof(b), NI_NUMERICSERV)) 485 return 0; 486 if (strcmp(a, b) != 0) 487 return 0; 488 489 return 1; 490 } 491