curl/tests/server/tftpd.c

   1 /***************************************************************************
   2  *                                  _   _ ____  _
   3  *  Project                     ___| | | |  _ \| |
   4  *                             / __| | | | |_) | |
   5  *                            | (__| |_| |  _ <| |___
   6  *                             \___|\___/|_| \_\_____|
   7  *
   8  * $Id: tftpd.c,v 1.39 2008-07-30 06:20:43 yangtse Exp $
   9  *
  10  * Trivial file transfer protocol server.
  11  *
  12  * This code includes many modifications by Jim Guyton <guyton@rand-unix>
  13  *
  14  * This source file was started based on netkit-tftpd 0.17
  15  * Heavily modified for curl's test suite
  16  */
  17
  18 /*
  19  * Copyright (c) 1983 Regents of the University of California.
  20  * All rights reserved.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the above copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *      This product includes software developed by the University of
  33  *      California, Berkeley and its contributors.
  34  * 4. Neither the name of the University nor the names of its contributors
  35  *    may be used to endorse or promote products derived from this software
  36  *    without specific prior written permission.
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  39  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  41  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  42  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  43  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  44  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  45  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  46  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  47  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  48  * SUCH DAMAGE.
  49  */
  50
  51 #include "setup.h" /* portability help from the lib directory */
  52
  53 #ifdef HAVE_SYS_IOCTL_H
  54 #include <sys/ioctl.h>
  55 #endif
  56 #ifdef HAVE_SIGNAL_H
  57 #include <signal.h>
  58 #endif
  59 #ifdef HAVE_FCNTL_H
  60 #include <fcntl.h>
  61 #endif
  62 #ifdef HAVE_SYS_SOCKET_H
  63 #include <sys/socket.h>
  64 #endif
  65 #ifdef HAVE_NETINET_IN_H
  66 #include <netinet/in.h>
  67 #endif
  68 #ifdef HAVE_ARPA_TFTP_H
  69 #include <arpa/tftp.h>
  70 #else
  71 #include "tftp.h"
  72 #endif
  73 #ifdef HAVE_NETDB_H
  74 #include <netdb.h>
  75 #endif
  76 #ifdef HAVE_SYS_FILIO_H
  77 /* FIONREAD on Solaris 7 */
  78 #include <sys/filio.h>
  79 #endif
  80
  81 #include <setjmp.h>
  82 #ifdef HAVE_UNISTD_H
  83 #include <unistd.h>
  84 #endif
  85 #ifdef HAVE_PWD_H
  86 #include <pwd.h>
  87 #endif
  88
  89 #define ENABLE_CURLX_PRINTF
  90 /* make the curlx header define all printf() functions to use the curlx_*
  91    versions instead */
  92 #include "curlx.h" /* from the private lib dir */
  93 #include "getpart.h"
  94 #include "util.h"
  95
  96 /* include memdebug.h last */
  97 #include "memdebug.h"
  98
  99 struct testcase {
 100   char *buffer;   /* holds the file data to send to the client */
 101   size_t bufsize; /* size of the data in buffer */
 102   char *rptr;     /* read pointer into the buffer */
 103   size_t rcount;  /* amount of data left to read of the file */
 104   long num;       /* test case number */
 105   int ofile;      /* file descriptor for output file when uploading to us */
 106 };
 107
 108 static int synchnet(curl_socket_t);
 109 static struct tftphdr *r_init(void);
 110 static struct tftphdr *w_init(void);
 111 static int readit(struct testcase *test, struct tftphdr **dpp, int convert);
 112 static int writeit(struct testcase *test, struct tftphdr **dpp, int ct,
 113                    int convert);
 114 static void mysignal(int, void (*func)(int));
 115
 116
 117 #define TIMEOUT         5
 118
 119 #define PKTSIZE SEGSIZE+4
 120
 121 struct formats;
 122 static int tftp(struct testcase *test, struct tftphdr *tp, ssize_t size);
 123 static void nak(int error);
 124 static void sendtftp(struct testcase *test, struct formats *pf);
 125 static void recvtftp(struct testcase *test, struct formats *pf);
 126 static int validate_access(struct testcase *test, const char *, int);
 127
 128 static curl_socket_t peer;
 129 static int rexmtval = TIMEOUT;
 130 static int maxtimeout = 5*TIMEOUT;
 131
 132 static char buf[PKTSIZE];
 133 static char ackbuf[PKTSIZE];
 134 static struct sockaddr_in from;
 135 static socklen_t fromlen;
 136
 137 struct bf {
 138   int counter;            /* size of data in buffer, or flag */
 139   char buf[PKTSIZE];      /* room for data packet */
 140 } bfs[2];
 141
 142                                 /* Values for bf.counter  */
 143 #define BF_ALLOC -3             /* alloc'd but not yet filled */
 144 #define BF_FREE  -2             /* free */
 145 /* [-1 .. SEGSIZE] = size of data in the data buffer */
 146
 147 static int nextone;     /* index of next buffer to use */
 148 static int current;     /* index of buffer in use */
 149
 150                         /* control flags for crlf conversions */
 151 int newline = 0;        /* fillbuf: in middle of newline expansion */
 152 int prevchar = -1;      /* putbuf: previous char (cr check) */
 153
 154 static void read_ahead(struct testcase *test,
 155                        int convert /* if true, convert to ascii */);
 156 static ssize_t write_behind(struct testcase *test, int convert);
 157 static struct tftphdr *rw_init(int);
 158 static struct tftphdr *w_init(void) { return rw_init(0); } /* write-behind */
 159 static struct tftphdr *r_init(void) { return rw_init(1); } /* read-ahead */
 160
 161 static struct tftphdr *
 162 rw_init(int x)              /* init for either read-ahead or write-behind */
 163 {                           /* zero for write-behind, one for read-head */
 164   newline = 0;            /* init crlf flag */
 165   prevchar = -1;
 166   bfs[0].counter =  BF_ALLOC;     /* pass out the first buffer */
 167   current = 0;
 168   bfs[1].counter = BF_FREE;
 169   nextone = x;                    /* ahead or behind? */
 170   return (struct tftphdr *)bfs[0].buf;
 171 }
 172
 173
 174 /* Have emptied current buffer by sending to net and getting ack.
 175    Free it and return next buffer filled with data.
 176  */
 177 static int readit(struct testcase *test, struct tftphdr **dpp,
 178            int convert /* if true, convert to ascii */)
 179 {
 180   struct bf *b;
 181
 182   bfs[current].counter = BF_FREE; /* free old one */
 183   current = !current;             /* "incr" current */
 184
 185   b = &bfs[current];              /* look at new buffer */
 186   if (b->counter == BF_FREE)      /* if it's empty */
 187     read_ahead(test, convert);      /* fill it */
 188
 189   *dpp = (struct tftphdr *)b->buf;        /* set caller's ptr */
 190   return b->counter;
 191 }
 192
 193 #undef MIN /* some systems have this defined already, some don't */
 194 #define MIN(x,y) ((x)<(y)?(x):(y));
 195
 196 /*
 197  * fill the input buffer, doing ascii conversions if requested
 198  * conversions are  lf -> cr,lf  and cr -> cr, nul
 199  */
 200 static void read_ahead(struct testcase *test,
 201                        int convert /* if true, convert to ascii */)
 202 {
 203   int i;
 204   char *p;
 205   int c;
 206   struct bf *b;
 207   struct tftphdr *dp;
 208
 209   b = &bfs[nextone];              /* look at "next" buffer */
 210   if (b->counter != BF_FREE)      /* nop if not free */
 211     return;
 212   nextone = !nextone;             /* "incr" next buffer ptr */
 213
 214   dp = (struct tftphdr *)b->buf;
 215
 216   if (convert == 0) {
 217     /* The former file reading code did this:
 218        b->counter = read(fileno(file), dp->th_data, SEGSIZE); */
 219     size_t copy_n = MIN(SEGSIZE, test->rcount);
 220     memcpy(dp->th_data, test->rptr, copy_n);
 221
 222     /* decrease amount, advance pointer */
 223     test->rcount -= copy_n;
 224     test->rptr += copy_n;
 225     b->counter = (int)copy_n;
 226     return;
 227   }
 228
 229   p = dp->th_data;
 230   for (i = 0 ; i < SEGSIZE; i++) {
 231     if (newline) {
 232       if (prevchar == '\n')
 233         c = '\n';       /* lf to cr,lf */
 234       else
 235         c = '\0';       /* cr to cr,nul */
 236       newline = 0;
 237     }
 238     else {
 239       if(test->rcount) {
 240         c=test->rptr[0];
 241         test->rptr++;
 242         test->rcount--;
 243       }
 244       else
 245         break;
 246       if (c == '\n' || c == '\r') {
 247         prevchar = c;
 248         c = '\r';
 249         newline = 1;
 250       }
 251     }
 252     *p++ = (char)c;
 253   }
 254   b->counter = (int)(p - dp->th_data);
 255 }
 256
 257 /* Update count associated with the buffer, get new buffer from the queue.
 258    Calls write_behind only if next buffer not available.
 259  */
 260 static int writeit(struct testcase *test, struct tftphdr **dpp,
 261                    int ct, int convert)
 262 {
 263   bfs[current].counter = ct;      /* set size of data to write */
 264   current = !current;             /* switch to other buffer */
 265   if (bfs[current].counter != BF_FREE)     /* if not free */
 266     write_behind(test, convert);     /* flush it */
 267   bfs[current].counter = BF_ALLOC;        /* mark as alloc'd */
 268   *dpp =  (struct tftphdr *)bfs[current].buf;
 269   return ct;                      /* this is a lie of course */
 270 }
 271
 272 /*
 273  * Output a buffer to a file, converting from netascii if requested.
 274  * CR,NUL -> CR  and CR,LF => LF.
 275  * Note spec is undefined if we get CR as last byte of file or a
 276  * CR followed by anything else.  In this case we leave it alone.
 277  */
 278 static ssize_t write_behind(struct testcase *test, int convert)
 279 {
 280   char *writebuf;
 281   int count;
 282   int ct;
 283   char *p;
 284   int c;                          /* current character */
 285   struct bf *b;
 286   struct tftphdr *dp;
 287
 288   b = &bfs[nextone];
 289   if (b->counter < -1)            /* anything to flush? */
 290     return 0;                     /* just nop if nothing to do */
 291
 292   if(!test->ofile) {
 293     char outfile[256];
 294     snprintf(outfile, sizeof(outfile), "log/upload.%ld", test->num);
 295     test->ofile=open(outfile, O_CREAT|O_RDWR, 0777);
 296     if(test->ofile == -1) {
 297       logmsg("Couldn't create and/or open file %s for upload!", outfile);
 298       return -1; /* failure! */
 299     }
 300   }
 301
 302   count = b->counter;             /* remember byte count */
 303   b->counter = BF_FREE;           /* reset flag */
 304   dp = (struct tftphdr *)b->buf;
 305   nextone = !nextone;             /* incr for next time */
 306   writebuf = dp->th_data;
 307
 308   if (count <= 0)
 309     return -1;                    /* nak logic? */
 310
 311   if (convert == 0)
 312     return write(test->ofile, writebuf, count);
 313
 314   p = writebuf;
 315   ct = count;
 316   while (ct--) {                  /* loop over the buffer */
 317     c = *p++;                     /* pick up a character */
 318     if (prevchar == '\r') {       /* if prev char was cr */
 319       if (c == '\n')              /* if have cr,lf then just */
 320         lseek(test->ofile, -1, SEEK_CUR); /* smash lf on top of the cr */
 321       else
 322         if (c == '\0')            /* if have cr,nul then */
 323           goto skipit;            /* just skip over the putc */
 324       /* else just fall through and allow it */
 325     }
 326     /* formerly
 327        putc(c, file); */
 328     write(test->ofile, &c, 1);
 329     skipit:
 330     prevchar = c;
 331   }
 332   return count;
 333 }
 334
 335
 336 /* When an error has occurred, it is possible that the two sides are out of
 337  * synch.  Ie: that what I think is the other side's response to packet N is
 338  * really their response to packet N-1.
 339  *
 340  * So, to try to prevent that, we flush all the input queued up for us on the
 341  * network connection on our host.
 342  *
 343  * We return the number of packets we flushed (mostly for reporting when trace
 344  * is active).
 345  */
 346
 347 static int synchnet(curl_socket_t f /* socket to flush */)
 348 {
 349
 350 #if defined(HAVE_IOCTLSOCKET)
 351   unsigned long i;
 352 #else
 353   int i;
 354 #endif
 355   int j = 0;
 356   char rbuf[PKTSIZE];
 357   struct sockaddr_in fromaddr;
 358   socklen_t fromaddrlen;
 359
 360   while (1) {
 361 #if defined(HAVE_IOCTLSOCKET)
 362     (void) ioctlsocket(f, FIONREAD, &i);
 363 #else
 364     (void) ioctl(f, FIONREAD, &i);
 365 #endif
 366     if (i) {
 367       j++;
 368       fromaddrlen = sizeof(fromaddr);
 369       (void)recvfrom(f, rbuf, sizeof(rbuf), 0,
 370                      (struct sockaddr *)&fromaddr, &fromaddrlen);
 371     }
 372     else
 373       break;
 374   }
 375   return j;
 376 }
 377
 378 #if defined(HAVE_ALARM) && defined(SIGALRM)
 379 /*
 380  * Like signal(), but with well-defined semantics.
 381  */
 382 static void mysignal(int sig, void (*handler)(int))
 383 {
 384   struct sigaction sa;
 385   memset(&sa, 0, sizeof(sa));
 386   sa.sa_handler = handler;
 387   sigaction(sig, &sa, NULL);
 388 }
 389 #endif
 390
 391 #ifndef DEFAULT_LOGFILE
 392 #define DEFAULT_LOGFILE "log/tftpd.log"
 393 #endif
 394
 395 #define DEFAULT_PORT 8999 /* UDP */
 396 const char *serverlogfile = DEFAULT_LOGFILE;
 397
 398 #define REQUEST_DUMP  "log/server.input"
 399
 400 char use_ipv6=FALSE;
 401
 402 int main(int argc, char **argv)
 403 {
 404   struct sockaddr_in me;
 405 #ifdef ENABLE_IPV6
 406   struct sockaddr_in6 me6;
 407 #endif /* ENABLE_IPV6 */
 408
 409   struct tftphdr *tp;
 410   ssize_t n = 0;
 411   int arg = 1;
 412   char *pidname= (char *)".tftpd.pid";
 413   unsigned short port = DEFAULT_PORT;
 414   curl_socket_t sock;
 415   int flag;
 416   int rc;
 417   struct testcase test;
 418   int result = 0;
 419
 420   while(argc>arg) {
 421     if(!strcmp("--version", argv[arg])) {
 422       printf("tftpd IPv4%s\n",
 423 #ifdef ENABLE_IPV6
 424              "/IPv6"
 425 #else
 426              ""
 427 #endif
 428              );
 429       return 0;
 430     }
 431     else if(!strcmp("--pidfile", argv[arg])) {
 432       arg++;
 433       if(argc>arg)
 434         pidname = argv[arg++];
 435     }
 436     else if(!strcmp("--ipv6", argv[arg])) {
 437 #ifdef ENABLE_IPV6
 438       use_ipv6=TRUE;
 439 #endif
 440       arg++;
 441     }
 442     else if(argc>arg) {
 443
 444       if(atoi(argv[arg]))
 445         port = (unsigned short)atoi(argv[arg++]);
 446
 447       if(argc>arg)
 448         path = argv[arg++];
 449     }
 450   }
 451
 452 #ifdef WIN32
 453   win32_init();
 454   atexit(win32_cleanup);
 455 #endif
 456
 457 #ifdef ENABLE_IPV6
 458   if(!use_ipv6)
 459 #endif
 460     sock = socket(AF_INET, SOCK_DGRAM, 0);
 461 #ifdef ENABLE_IPV6
 462   else
 463     sock = socket(AF_INET6, SOCK_DGRAM, 0);
 464 #endif
 465
 466   if (sock < 0) {
 467     perror("opening stream socket");
 468     logmsg("Error opening socket");
 469     return 1;
 470   }
 471
 472   flag = 1;
 473   if (setsockopt
 474       (sock, SOL_SOCKET, SO_REUSEADDR, (const void *) &flag,
 475        sizeof(int)) < 0) {
 476     perror("setsockopt(SO_REUSEADDR)");
 477   }
 478
 479 #ifdef ENABLE_IPV6
 480   if(!use_ipv6) {
 481 #endif
 482     me.sin_family = AF_INET;
 483     me.sin_addr.s_addr = INADDR_ANY;
 484     me.sin_port = htons(port);
 485     rc = bind(sock, (struct sockaddr *) &me, sizeof(me));
 486 #ifdef ENABLE_IPV6
 487   }
 488   else {
 489     memset(&me6, 0, sizeof(struct sockaddr_in6));
 490     me6.sin6_family = AF_INET6;
 491     me6.sin6_addr = in6addr_any;
 492     me6.sin6_port = htons(port);
 493     rc = bind(sock, (struct sockaddr *) &me6, sizeof(me6));
 494   }
 495 #endif /* ENABLE_IPV6 */
 496   if(rc < 0) {
 497     perror("binding stream socket");
 498     logmsg("Error binding socket");
 499     sclose(sock);
 500     return 1;
 501   }
 502
 503   if(!write_pidfile(pidname)) {
 504     sclose(sock);
 505     return 1;
 506   }
 507
 508   logmsg("Running IPv%d version on port UDP/%d",
 509 #ifdef ENABLE_IPV6
 510          (use_ipv6?6:4)
 511 #else
 512          4
 513 #endif
 514          , port );
 515
 516   do {
 517     fromlen = sizeof(from);
 518     n = (ssize_t)recvfrom(sock, buf, sizeof(buf), 0,
 519                           (struct sockaddr *)&from, &fromlen);
 520     if (n < 0) {
 521       logmsg("recvfrom:\n");
 522       result = 3;
 523       break;
 524     }
 525
 526     set_advisor_read_lock(SERVERLOGS_LOCK);
 527
 528     from.sin_family = AF_INET;
 529
 530     peer = socket(AF_INET, SOCK_DGRAM, 0);
 531     if (peer < 0) {
 532       logmsg("socket:\n");
 533       result = 2;
 534       break;
 535     }
 536
 537     if (connect(peer, (struct sockaddr *)&from, sizeof(from)) < 0) {
 538       logmsg("connect: fail\n");
 539       result = 1;
 540       break;
 541     }
 542     maxtimeout = 5*TIMEOUT;
 543
 544     tp = (struct tftphdr *)buf;
 545     tp->th_opcode = ntohs(tp->th_opcode);
 546     if (tp->th_opcode == RRQ || tp->th_opcode == WRQ) {
 547       memset(&test, 0, sizeof(test));
 548       if (tftp(&test, tp, n) < 0)
 549         break;
 550       if(test.buffer)
 551         free(test.buffer);
 552     }
 553     sclose(peer);
 554
 555     clear_advisor_read_lock(SERVERLOGS_LOCK);
 556
 557   } while(1);
 558
 559   clear_advisor_read_lock(SERVERLOGS_LOCK);
 560
 561   return result;
 562 }
 563
 564 struct formats {
 565   const char *f_mode;
 566   int f_convert;
 567 } formats[] = {
 568   { "netascii",   1 },
 569   { "octet",      0 },
 570   { NULL,         0 }
 571 };
 572
 573 /*
 574  * Handle initial connection protocol.
 575  */
 576 static int tftp(struct testcase *test, struct tftphdr *tp, ssize_t size)
 577 {
 578   char *cp;
 579   int first = 1, ecode;
 580   struct formats *pf;
 581   char *filename, *mode = NULL;
 582   int error;
 583   FILE *server;
 584
 585   /* Open request dump file. */
 586   server = fopen(REQUEST_DUMP, "ab");
 587   if(!server) {
 588     error = ERRNO;
 589     logmsg("fopen() failed with error: %d %s", error, strerror(error));
 590     logmsg("Error opening file: %s", REQUEST_DUMP);
 591     return -1;
 592   }
 593
 594   /* store input protocol */
 595   fprintf(server, "opcode: %x\n", tp->th_opcode);
 596
 597   cp = (char *)&tp->th_stuff;
 598   filename = cp;
 599 again:
 600   while (cp < buf + size) {
 601     if (*cp == '\0')
 602       break;
 603     cp++;
 604   }
 605   if (*cp) {
 606     nak(EBADOP);
 607     fclose(server);
 608     return 3;
 609   }
 610   if (first) {
 611     mode = ++cp;
 612     first = 0;
 613     goto again;
 614   }
 615   /* store input protocol */
 616   fprintf(server, "filename: %s\n", filename);
 617
 618   for (cp = mode; *cp; cp++)
 619     if(ISUPPER(*cp))
 620       *cp = (char)tolower((int)*cp);
 621
 622   /* store input protocol */
 623   fprintf(server, "mode: %s\n", mode);
 624   fclose(server);
 625
 626   for (pf = formats; pf->f_mode; pf++)
 627     if (strcmp(pf->f_mode, mode) == 0)
 628       break;
 629   if (!pf->f_mode) {
 630     nak(EBADOP);
 631     return 2;
 632   }
 633   ecode = validate_access(test, filename, tp->th_opcode);
 634   if (ecode) {
 635     nak(ecode);
 636     return 1;
 637   }
 638   if (tp->th_opcode == WRQ)
 639     recvtftp(test, pf);
 640   else
 641     sendtftp(test, pf);
 642
 643   return 0;
 644 }
 645
 646 /*
 647  * Validate file access.
 648  */
 649 static int validate_access(struct testcase *test,
 650                            const char *filename, int mode)
 651 {
 652   char *ptr;
 653   long testno, partno;
 654   int error;
 655   char partbuf[80]="data";
 656
 657   logmsg("trying to get file: %s mode %x", filename, mode);
 658
 659   if(!strncmp("verifiedserver", filename, 14)) {
 660     char weare[128];
 661     size_t count = sprintf(weare, "WE ROOLZ: %ld\r\n", (long)getpid());
 662
 663     logmsg("Are-we-friendly question received");
 664     test->buffer = strdup(weare);
 665     test->rptr = test->buffer; /* set read pointer */
 666     test->bufsize = count;    /* set total count */
 667     test->rcount = count;     /* set data left to read */
 668     return 0; /* fine */
 669   }
 670
 671   /* find the last slash */
 672   ptr = strrchr(filename, '/');
 673
 674   if(ptr) {
 675     char *file;
 676
 677     ptr++; /* skip the slash */
 678
 679     /* skip all non-numericals following the slash */
 680     while(*ptr && !ISDIGIT(*ptr))
 681       ptr++;
 682
 683     /* get the number */
 684     testno = strtol(ptr, &ptr, 10);
 685
 686     if(testno > 10000) {
 687       partno = testno % 10000;
 688       testno /= 10000;
 689     }
 690     else
 691       partno = 0;
 692
 693
 694     logmsg("requested test number %ld part %ld", testno, partno);
 695
 696     test->num = testno;
 697
 698     file = test2file(testno);
 699
 700     if(0 != partno)
 701       sprintf(partbuf, "data%ld", partno);
 702
 703     if(file) {
 704       FILE *stream=fopen(file, "rb");
 705       if(!stream) {
 706         error = ERRNO;
 707         logmsg("fopen() failed with error: %d %s", error, strerror(error));
 708         logmsg("Error opening file: %s", file);
 709         logmsg("Couldn't open test file: %s", file);
 710         return EACCESS;
 711       }
 712       else {
 713         size_t count;
 714         test->buffer = (char *)spitout(stream, "reply", partbuf, &count);
 715         fclose(stream);
 716         if(test->buffer) {
 717           test->rptr = test->buffer; /* set read pointer */
 718           test->bufsize = count;    /* set total count */
 719           test->rcount = count;     /* set data left to read */
 720         }
 721         else
 722           return EACCESS;
 723       }
 724
 725     }
 726     else
 727       return EACCESS;
 728   }
 729   else {
 730     logmsg("no slash found in path");
 731     return EACCESS; /* failure */
 732   }
 733
 734   return 0;
 735 }
 736
 737 int timeout;
 738 #ifdef HAVE_SIGSETJMP
 739 sigjmp_buf timeoutbuf;
 740 #endif
 741
 742 static void timer(int signum)
 743 {
 744   (void)signum;
 745
 746   logmsg("alarm!");
 747
 748   timeout += rexmtval;
 749   if(timeout >= maxtimeout) {
 750     clear_advisor_read_lock(SERVERLOGS_LOCK);
 751     exit(1);
 752   }
 753 #ifdef HAVE_SIGSETJMP
 754   siglongjmp(timeoutbuf, 1);
 755 #endif
 756 }
 757
 758 /*
 759  * Send the requested file.
 760  */
 761 static void sendtftp(struct testcase *test, struct formats *pf)
 762 {
 763   struct tftphdr *dp;
 764   struct tftphdr *ap;    /* ack packet */
 765   unsigned short block = 1;
 766   int size;
 767   ssize_t n;
 768 #if defined(HAVE_ALARM) && defined(SIGALRM)
 769   mysignal(SIGALRM, timer);
 770 #endif
 771   dp = r_init();
 772   ap = (struct tftphdr *)ackbuf;
 773   do {
 774     size = readit(test, &dp, pf->f_convert);
 775     if (size < 0) {
 776       nak(ERRNO + 100);
 777       return;
 778     }
 779     dp->th_opcode = htons((u_short)DATA);
 780     dp->th_block = htons((u_short)block);
 781     timeout = 0;
 782 #ifdef HAVE_SIGSETJMP
 783     (void) sigsetjmp(timeoutbuf, 1);
 784 #endif
 785     send_data:
 786     if (swrite(peer, dp, size + 4) != size + 4) {
 787       logmsg("write\n");
 788       return;
 789     }
 790     read_ahead(test, pf->f_convert);
 791     for ( ; ; ) {
 792 #ifdef HAVE_ALARM
 793       alarm(rexmtval);        /* read the ack */
 794 #endif
 795       n = sread(peer, ackbuf, sizeof (ackbuf));
 796 #ifdef HAVE_ALARM
 797       alarm(0);
 798 #endif
 799       if (n < 0) {
 800         logmsg("read: fail\n");
 801         return;
 802       }
 803       ap->th_opcode = ntohs((u_short)ap->th_opcode);
 804       ap->th_block = ntohs((u_short)ap->th_block);
 805
 806       if (ap->th_opcode == ERROR) {
 807         logmsg("got ERROR");
 808         return;
 809       }
 810
 811       if (ap->th_opcode == ACK) {
 812         if (ap->th_block == block) {
 813           break;
 814         }
 815         /* Re-synchronize with the other side */
 816         (void) synchnet(peer);
 817         if (ap->th_block == (block -1)) {
 818           goto send_data;
 819         }
 820       }
 821
 822     }
 823     block++;
 824   } while (size == SEGSIZE);
 825 }
 826
 827 static void justtimeout(int signum)
 828 {
 829   (void)signum;
 830 }
 831
 832
 833 /*
 834  * Receive a file.
 835  */
 836 static void recvtftp(struct testcase *test, struct formats *pf)
 837 {
 838   struct tftphdr *dp;
 839   struct tftphdr *ap;    /* ack buffer */
 840   unsigned short block = 0;
 841   ssize_t n, size;
 842 #if defined(HAVE_ALARM) && defined(SIGALRM)
 843   mysignal(SIGALRM, timer);
 844 #endif
 845   dp = w_init();
 846   ap = (struct tftphdr *)ackbuf;
 847   do {
 848     timeout = 0;
 849     ap->th_opcode = htons((u_short)ACK);
 850     ap->th_block = htons((u_short)block);
 851     block++;
 852 #ifdef HAVE_SIGSETJMP
 853     (void) sigsetjmp(timeoutbuf, 1);
 854 #endif
 855 send_ack:
 856     if (swrite(peer, ackbuf, 4) != 4) {
 857       logmsg("write: fail\n");
 858       goto abort;
 859     }
 860     write_behind(test, pf->f_convert);
 861     for ( ; ; ) {
 862 #ifdef HAVE_ALARM
 863       alarm(rexmtval);
 864 #endif
 865       n = sread(peer, dp, PKTSIZE);
 866 #ifdef HAVE_ALARM
 867       alarm(0);
 868 #endif
 869       if (n < 0) {                       /* really? */
 870         logmsg("read: fail\n");
 871         goto abort;
 872       }
 873       dp->th_opcode = ntohs((u_short)dp->th_opcode);
 874       dp->th_block = ntohs((u_short)dp->th_block);
 875       if (dp->th_opcode == ERROR)
 876         goto abort;
 877       if (dp->th_opcode == DATA) {
 878         if (dp->th_block == block) {
 879           break;                         /* normal */
 880         }
 881         /* Re-synchronize with the other side */
 882         (void) synchnet(peer);
 883         if (dp->th_block == (block-1))
 884           goto send_ack;                 /* rexmit */
 885       }
 886     }
 887
 888     size = writeit(test, &dp, (int)(n - 4), pf->f_convert);
 889     if (size != (n-4)) {                 /* ahem */
 890       if (size < 0)
 891         nak(ERRNO + 100);
 892       else
 893         nak(ENOSPACE);
 894       goto abort;
 895     }
 896   } while (size == SEGSIZE);
 897   write_behind(test, pf->f_convert);
 898
 899   ap->th_opcode = htons((u_short)ACK);   /* send the "final" ack */
 900   ap->th_block = htons((u_short)(block));
 901   (void) swrite(peer, ackbuf, 4);
 902 #if defined(HAVE_ALARM) && defined(SIGALRM)
 903   mysignal(SIGALRM, justtimeout);        /* just abort read on timeout */
 904   alarm(rexmtval);
 905 #endif
 906   n = sread(peer, buf, sizeof(buf));     /* normally times out and quits */
 907 #ifdef HAVE_ALARM
 908   alarm(0);
 909 #endif
 910   if (n >= 4 &&                          /* if read some data */
 911       dp->th_opcode == DATA &&           /* and got a data block */
 912       block == dp->th_block) {           /* then my last ack was lost */
 913     (void) swrite(peer, ackbuf, 4);      /* resend final ack */
 914   }
 915 abort:
 916   return;
 917 }
 918
 919 struct errmsg {
 920   int e_code;
 921   const char *e_msg;
 922 } errmsgs[] = {
 923   { EUNDEF,       "Undefined error code" },
 924   { ENOTFOUND,    "File not found" },
 925   { EACCESS,      "Access violation" },
 926   { ENOSPACE,     "Disk full or allocation exceeded" },
 927   { EBADOP,       "Illegal TFTP operation" },
 928   { EBADID,       "Unknown transfer ID" },
 929   { EEXISTS,      "File already exists" },
 930   { ENOUSER,      "No such user" },
 931   { -1,           0 }
 932 };
 933
 934 /*
 935  * Send a nak packet (error message).  Error code passed in is one of the
 936  * standard TFTP codes, or a UNIX errno offset by 100.
 937  */
 938 static void nak(int error)
 939 {
 940   struct tftphdr *tp;
 941   int length;
 942   struct errmsg *pe;
 943
 944   tp = (struct tftphdr *)buf;
 945   tp->th_opcode = htons((u_short)ERROR);
 946   tp->th_code = htons((u_short)error);
 947   for (pe = errmsgs; pe->e_code >= 0; pe++)
 948     if (pe->e_code == error)
 949       break;
 950   if (pe->e_code < 0) {
 951     pe->e_msg = strerror(error - 100);
 952     tp->th_code = EUNDEF;   /* set 'undef' errorcode */
 953   }
 954   strcpy(tp->th_msg, pe->e_msg);
 955   length = (int)strlen(pe->e_msg);
 956   tp->th_msg[length] = '\0';
 957   length += 5;
 958   if (swrite(peer, buf, length) != length)
 959     logmsg("nak: fail\n");
 960 }