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 #include <sys/cdefs.h> 35 36 __FBSDID("$FreeBSD$"); 37 38 #ifndef lint 39 static const char sccsid[] = "@(#)tftp.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 42 /* Many bug fixes are from Jim Guyton <guyton@rand-unix> */ 43 44 /* 45 * TFTP User Program -- Protocol Machines 46 */ 47 #include <sys/types.h> 48 #include <sys/socket.h> 49 #include <sys/time.h> 50 51 #include <netinet/in.h> 52 53 #include <arpa/tftp.h> 54 55 #include <err.h> 56 #include <errno.h> 57 #include <setjmp.h> 58 #include <signal.h> 59 #include <stdio.h> 60 #include <string.h> 61 #include <unistd.h> 62 63 #include "extern.h" 64 #include "tftpsubs.h" 65 66 extern struct sockaddr_in peeraddr; /* filled in by main */ 67 extern int f; /* the opened socket */ 68 extern int trace; 69 extern int verbose; 70 extern int rexmtval; 71 extern int maxtimeout; 72 73 #define PKTSIZE SEGSIZE+4 74 char ackbuf[PKTSIZE]; 75 int timeout; 76 jmp_buf toplevel; 77 jmp_buf timeoutbuf; 78 79 static void nak __P((int)); 80 static int makerequest __P((int, const char *, struct tftphdr *, const char *)); 81 static void printstats __P((const char *, unsigned long)); 82 static void startclock __P((void)); 83 static void stopclock __P((void)); 84 static void timer __P((int)); 85 static void tpacket __P((const char *, struct tftphdr *, int)); 86 87 /* 88 * Send the requested file. 89 */ 90 void 91 xmitfile(fd, name, mode) 92 int fd; 93 char *name; 94 char *mode; 95 { 96 struct tftphdr *ap; /* data and ack packets */ 97 struct tftphdr *dp; 98 int n; 99 volatile unsigned short block; 100 volatile int size, convert; 101 volatile unsigned long amount; 102 struct sockaddr_in from; 103 int fromlen; 104 FILE *file; 105 106 startclock(); /* start stat's clock */ 107 dp = r_init(); /* reset fillbuf/read-ahead code */ 108 ap = (struct tftphdr *)ackbuf; 109 file = fdopen(fd, "r"); 110 convert = !strcmp(mode, "netascii"); 111 block = 0; 112 amount = 0; 113 114 signal(SIGALRM, timer); 115 do { 116 if (block == 0) 117 size = makerequest(WRQ, name, dp, mode) - 4; 118 else { 119 /* size = read(fd, dp->th_data, SEGSIZE); */ 120 size = readit(file, &dp, convert); 121 if (size < 0) { 122 nak(errno + 100); 123 break; 124 } 125 dp->th_opcode = htons((u_short)DATA); 126 dp->th_block = htons((u_short)block); 127 } 128 timeout = 0; 129 (void) setjmp(timeoutbuf); 130 send_data: 131 if (trace) 132 tpacket("sent", dp, size + 4); 133 n = sendto(f, dp, size + 4, 0, 134 (struct sockaddr *)&peeraddr, sizeof(peeraddr)); 135 if (n != size + 4) { 136 warn("sendto"); 137 goto abort; 138 } 139 read_ahead(file, convert); 140 for ( ; ; ) { 141 alarm(rexmtval); 142 do { 143 fromlen = sizeof(from); 144 n = recvfrom(f, ackbuf, sizeof(ackbuf), 0, 145 (struct sockaddr *)&from, &fromlen); 146 } while (n <= 0); 147 alarm(0); 148 if (n < 0) { 149 warn("recvfrom"); 150 goto abort; 151 } 152 peeraddr.sin_port = from.sin_port; /* added */ 153 if (trace) 154 tpacket("received", ap, n); 155 /* should verify packet came from server */ 156 ap->th_opcode = ntohs(ap->th_opcode); 157 ap->th_block = ntohs(ap->th_block); 158 if (ap->th_opcode == ERROR) { 159 printf("Error code %d: %s\n", ap->th_code, 160 ap->th_msg); 161 goto abort; 162 } 163 if (ap->th_opcode == ACK) { 164 int j; 165 166 if (ap->th_block == block) { 167 break; 168 } 169 /* On an error, try to synchronize 170 * both sides. 171 */ 172 j = synchnet(f); 173 if (j && trace) { 174 printf("discarded %d packets\n", 175 j); 176 } 177 if (ap->th_block == (block-1)) { 178 goto send_data; 179 } 180 } 181 } 182 if (block > 0) 183 amount += size; 184 block++; 185 } while (size == SEGSIZE || block == 1); 186 abort: 187 fclose(file); 188 stopclock(); 189 if (amount > 0) 190 printstats("Sent", amount); 191 } 192 193 /* 194 * Receive a file. 195 */ 196 void 197 recvfile(fd, name, mode) 198 int fd; 199 char *name; 200 char *mode; 201 { 202 struct tftphdr *ap; 203 struct tftphdr *dp; 204 int n; 205 volatile unsigned short block; 206 volatile int size, firsttrip; 207 volatile unsigned long amount; 208 struct sockaddr_in from; 209 int fromlen; 210 FILE *file; 211 volatile int convert; /* true if converting crlf -> lf */ 212 213 startclock(); 214 dp = w_init(); 215 ap = (struct tftphdr *)ackbuf; 216 file = fdopen(fd, "w"); 217 convert = !strcmp(mode, "netascii"); 218 block = 1; 219 firsttrip = 1; 220 amount = 0; 221 222 signal(SIGALRM, timer); 223 do { 224 if (firsttrip) { 225 size = makerequest(RRQ, name, ap, mode); 226 firsttrip = 0; 227 } else { 228 ap->th_opcode = htons((u_short)ACK); 229 ap->th_block = htons((u_short)(block)); 230 size = 4; 231 block++; 232 } 233 timeout = 0; 234 (void) setjmp(timeoutbuf); 235 send_ack: 236 if (trace) 237 tpacket("sent", ap, size); 238 if (sendto(f, ackbuf, size, 0, (struct sockaddr *)&peeraddr, 239 sizeof(peeraddr)) != size) { 240 alarm(0); 241 warn("sendto"); 242 goto abort; 243 } 244 write_behind(file, convert); 245 for ( ; ; ) { 246 alarm(rexmtval); 247 do { 248 fromlen = sizeof(from); 249 n = recvfrom(f, dp, PKTSIZE, 0, 250 (struct sockaddr *)&from, &fromlen); 251 } while (n <= 0); 252 alarm(0); 253 if (n < 0) { 254 warn("recvfrom"); 255 goto abort; 256 } 257 peeraddr.sin_port = from.sin_port; /* added */ 258 if (trace) 259 tpacket("received", dp, n); 260 /* should verify client address */ 261 dp->th_opcode = ntohs(dp->th_opcode); 262 dp->th_block = ntohs(dp->th_block); 263 if (dp->th_opcode == ERROR) { 264 printf("Error code %d: %s\n", dp->th_code, 265 dp->th_msg); 266 goto abort; 267 } 268 if (dp->th_opcode == DATA) { 269 int j; 270 271 if (dp->th_block == block) { 272 break; /* have next packet */ 273 } 274 /* On an error, try to synchronize 275 * both sides. 276 */ 277 j = synchnet(f); 278 if (j && trace) { 279 printf("discarded %d packets\n", j); 280 } 281 if (dp->th_block == (block-1)) { 282 goto send_ack; /* resend ack */ 283 } 284 } 285 } 286 /* size = write(fd, dp->th_data, n - 4); */ 287 size = writeit(file, &dp, n - 4, convert); 288 if (size < 0) { 289 nak(errno + 100); 290 break; 291 } 292 amount += size; 293 } while (size == SEGSIZE); 294 abort: /* ok to ack, since user */ 295 ap->th_opcode = htons((u_short)ACK); /* has seen err msg */ 296 ap->th_block = htons((u_short)block); 297 (void) sendto(f, ackbuf, 4, 0, (struct sockaddr *)&peeraddr, 298 sizeof(peeraddr)); 299 write_behind(file, convert); /* flush last buffer */ 300 fclose(file); 301 stopclock(); 302 if (amount > 0) 303 printstats("Received", amount); 304 } 305 306 static int 307 makerequest(request, name, tp, mode) 308 int request; 309 const char *name; 310 struct tftphdr *tp; 311 const char *mode; 312 { 313 char *cp; 314 315 tp->th_opcode = htons((u_short)request); 316 cp = tp->th_stuff; 317 strcpy(cp, name); 318 cp += strlen(name); 319 *cp++ = '\0'; 320 strcpy(cp, mode); 321 cp += strlen(mode); 322 *cp++ = '\0'; 323 return (cp - (char *)tp); 324 } 325 326 struct errmsg { 327 int e_code; 328 const char *e_msg; 329 } errmsgs[] = { 330 { EUNDEF, "Undefined error code" }, 331 { ENOTFOUND, "File not found" }, 332 { EACCESS, "Access violation" }, 333 { ENOSPACE, "Disk full or allocation exceeded" }, 334 { EBADOP, "Illegal TFTP operation" }, 335 { EBADID, "Unknown transfer ID" }, 336 { EEXISTS, "File already exists" }, 337 { ENOUSER, "No such user" }, 338 { -1, 0 } 339 }; 340 341 /* 342 * Send a nak packet (error message). 343 * Error code passed in is one of the 344 * standard TFTP codes, or a UNIX errno 345 * offset by 100. 346 */ 347 static void 348 nak(error) 349 int error; 350 { 351 struct errmsg *pe; 352 struct tftphdr *tp; 353 int length; 354 355 tp = (struct tftphdr *)ackbuf; 356 tp->th_opcode = htons((u_short)ERROR); 357 tp->th_code = htons((u_short)error); 358 for (pe = errmsgs; pe->e_code >= 0; pe++) 359 if (pe->e_code == error) 360 break; 361 if (pe->e_code < 0) { 362 pe->e_msg = strerror(error - 100); 363 tp->th_code = EUNDEF; 364 } 365 strcpy(tp->th_msg, pe->e_msg); 366 length = strlen(pe->e_msg) + 4; 367 if (trace) 368 tpacket("sent", tp, length); 369 if (sendto(f, ackbuf, length, 0, (struct sockaddr *)&peeraddr, 370 sizeof(peeraddr)) != length) 371 warn("nak"); 372 } 373 374 static void 375 tpacket(s, tp, n) 376 const char *s; 377 struct tftphdr *tp; 378 int n; 379 { 380 static const char *opcodes[] = 381 { "#0", "RRQ", "WRQ", "DATA", "ACK", "ERROR" }; 382 char *cp, *file; 383 u_short op = ntohs(tp->th_opcode); 384 385 if (op < RRQ || op > ERROR) 386 printf("%s opcode=%x ", s, op); 387 else 388 printf("%s %s ", s, opcodes[op]); 389 switch (op) { 390 391 case RRQ: 392 case WRQ: 393 n -= 2; 394 file = cp = tp->th_stuff; 395 cp = index(cp, '\0'); 396 printf("<file=%s, mode=%s>\n", file, cp + 1); 397 break; 398 399 case DATA: 400 printf("<block=%d, %d bytes>\n", ntohs(tp->th_block), n - 4); 401 break; 402 403 case ACK: 404 printf("<block=%d>\n", ntohs(tp->th_block)); 405 break; 406 407 case ERROR: 408 printf("<code=%d, msg=%s>\n", ntohs(tp->th_code), tp->th_msg); 409 break; 410 } 411 } 412 413 struct timeval tstart; 414 struct timeval tstop; 415 416 static void 417 startclock() 418 { 419 420 (void)gettimeofday(&tstart, NULL); 421 } 422 423 static void 424 stopclock() 425 { 426 427 (void)gettimeofday(&tstop, NULL); 428 } 429 430 static void 431 printstats(direction, amount) 432 const char *direction; 433 unsigned long amount; 434 { 435 double delta; 436 /* compute delta in 1/10's second units */ 437 delta = ((tstop.tv_sec*10.)+(tstop.tv_usec/100000)) - 438 ((tstart.tv_sec*10.)+(tstart.tv_usec/100000)); 439 delta = delta/10.; /* back to seconds */ 440 printf("%s %ld bytes in %.1f seconds", direction, amount, delta); 441 if (verbose) 442 printf(" [%.0f bits/sec]", (amount*8.)/delta); 443 putchar('\n'); 444 } 445 446 static void 447 timer(sig) 448 int sig __unused; 449 { 450 451 timeout += rexmtval; 452 if (timeout >= maxtimeout) { 453 printf("Transfer timed out.\n"); 454 longjmp(toplevel, -1); 455 } 456 longjmp(timeoutbuf, 1); 457 } 458