test/src/server.c

   1 /* A little hacked up program that listens on a given port and allows a script
   2 to play the part of a remote MTA for testing purposes. This scripted version is
   3 hacked from my original interactive version. A further hack allows it to listen
   4 on a Unix domain socket as an alternative to a TCP/IP port.
   5
   6 In an IPv6 world, listening happens on both an IPv6 and an IPv4 socket, always
   7 on all interfaces, unless the option -noipv6 is given. */
   8
   9 /* ANSI C standard includes */
  10
  11 #include <ctype.h>
  12 #include <signal.h>
  13 #include <stdarg.h>
  14 #include <stddef.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include <time.h>
  19
  20 /* Unix includes */
  21
  22 #include <errno.h>
  23 #include <dirent.h>
  24 #include <sys/types.h>
  25
  26 #include <netinet/in_systm.h>
  27 #include <netinet/in.h>
  28 #include <netinet/ip.h>
  29 #include <netinet/tcp.h>
  30
  31 #ifdef HAVE_NETINET_IP_VAR_H
  32 # include <netinet/ip_var.h>
  33 #endif
  34
  35 #include <netdb.h>
  36 #include <arpa/inet.h>
  37 #include <sys/time.h>
  38 #include <sys/resource.h>
  39 #include <sys/socket.h>
  40 #include <sys/un.h>
  41 #include <sys/stat.h>
  42 #include <fcntl.h>
  43 #include <unistd.h>
  44 #include <utime.h>
  45
  46 #ifdef AF_INET6
  47 # define HAVE_IPV6 1
  48 #endif
  49
  50 #ifndef S_ADDR_TYPE
  51 # define S_ADDR_TYPE u_long
  52 #endif
  53
  54 #ifndef CS
  55 # define CS (char *)
  56 # define CCS (const char *)
  57 #endif
  58
  59
  60 typedef struct line {
  61   struct line *next;
  62   unsigned len;
  63   char line[1];
  64 } line;
  65
  66 typedef unsigned BOOL;
  67 #define FALSE 0
  68 #define TRUE  1
  69
  70
  71 /*************************************************
  72 *            SIGALRM handler - crash out         *
  73 *************************************************/
  74 int tmo_noerror = 0;
  75
  76 static void
  77 sigalrm_handler(int sig)
  78 {
  79 sig = sig;    /* Keep picky compilers happy */
  80 printf("\nServer timed out\n");
  81 exit(tmo_noerror ? 0 : 99);
  82 }
  83
  84
  85 /*************************************************
  86 *          Get textual IP address                *
  87 *************************************************/
  88
  89 /* This function is copied from Exim */
  90
  91 char *
  92 host_ntoa(const void *arg, char *buffer)
  93 {
  94 char *yield;
  95
  96 /* The new world. It is annoying that we have to fish out the address from
  97 different places in the block, depending on what kind of address it is. It
  98 is also a pain that inet_ntop() returns a const char *, whereas the IPv4
  99 function inet_ntoa() returns just char *, and some picky compilers insist
 100 on warning if one assigns a const char * to a char *. Hence the casts. */
 101
 102 #if HAVE_IPV6
 103 char addr_buffer[46];
 104 int family = ((struct sockaddr *)arg)->sa_family;
 105 if (family == AF_INET6)
 106   {
 107   struct sockaddr_in6 *sk = (struct sockaddr_in6 *)arg;
 108   yield = (char *)inet_ntop(family, &(sk->sin6_addr), addr_buffer,
 109     sizeof(addr_buffer));
 110   }
 111 else
 112   {
 113   struct sockaddr_in *sk = (struct sockaddr_in *)arg;
 114   yield = (char *)inet_ntop(family, &(sk->sin_addr), addr_buffer,
 115     sizeof(addr_buffer));
 116   }
 117
 118 /* If the result is a mapped IPv4 address, show it in V4 format. */
 119
 120 if (strncmp(yield, "::ffff:", 7) == 0) yield += 7;
 121
 122 #else /* HAVE_IPV6 */
 123
 124 /* The old world */
 125
 126 yield = inet_ntoa(((struct sockaddr_in *)arg)->sin_addr);
 127 #endif
 128
 129 strcpy(buffer, yield);
 130 return buffer;
 131 }
 132
 133
 134
 135 static void
 136 printit(char * s, int n)
 137 {
 138 while(n--)
 139   {
 140   unsigned char c = *s++;
 141   if (c == '\\')
 142     printf("\\\\");
 143   else if (c >= ' ' && c <= '~')        /* assumes ascii */
 144     putchar(c);
 145   else
 146     printf("\\x%02x", c);
 147   }
 148 putchar('\n');
 149 }
 150
 151
 152
 153 /*************************************************
 154 *                 Main Program                   *
 155 *************************************************/
 156
 157 #define v6n 0    /* IPv6 socket number */
 158 #define v4n 1    /* IPv4 socket number */
 159 #define udn 2    /* Unix domain socket number */
 160 #define skn 2    /* Potential number of sockets */
 161
 162 int main(int argc, char **argv)
 163 {
 164 int i;
 165 int port = 0;
 166 int listen_socket[3] = { -1, -1, -1 };
 167 int accept_socket;
 168 int dup_accept_socket;
 169 int connection_count = 1;
 170 int count;
 171 int on = 1;
 172 int timeout = 5;
 173 int initial_pause = 0, tfo = 0;
 174 int use_ipv4 = 1;
 175 int use_ipv6 = 1;
 176 int debug = 0;
 177 int na = 1;
 178 line *script = NULL;
 179 line *last = NULL;
 180 line *s;
 181 FILE *in, *out;
 182 int linebuf = 1;
 183 char *pidfile = NULL;
 184
 185 char *sockname = NULL;
 186 unsigned char buffer[10240];
 187
 188 struct sockaddr_un sockun;            /* don't use "sun" */
 189 struct sockaddr_un sockun_accepted;
 190 int sockun_len = sizeof(sockun_accepted);
 191
 192 #if HAVE_IPV6
 193 struct sockaddr_in6 sin6;
 194 struct sockaddr_in6 accepted;
 195 struct in6_addr anyaddr6 =  IN6ADDR_ANY_INIT ;
 196 #else
 197 struct sockaddr_in accepted;
 198 #endif
 199
 200 /* Always need an IPv4 structure */
 201
 202 struct sockaddr_in sin4;
 203
 204 int len = sizeof(accepted);
 205
 206
 207 /* Sort out the arguments */
 208 if (argc > 1 && (!strcmp(argv[1], "--help") || !strcmp(argv[1], "-h")))
 209   {
 210   printf("Usage: %s [options] port|socket [connection count]\n", argv[0]);
 211   puts("Options"
 212        "\n\t-d       debug"
 213        "\n\t-i n     n seconds initial delay"
 214        "\n\t-noipv4  disable ipv4"
 215        "\n\t-noipv6  disable ipv6"
 216        "\n\t-oP file write PID to file"
 217        "\n\t-t n     n seconds timeout"
 218        "\n\t-tfo     enable TCP Fast Open"
 219   );
 220   exit(0);
 221   }
 222
 223 while (na < argc && argv[na][0] == '-')
 224   {
 225   if (strcmp(argv[na], "-d") == 0) debug = 1;
 226   else if (strcmp(argv[na], "-tfo") == 0) tfo = 1;
 227   else if (strcmp(argv[na], "-t") == 0)
 228     {
 229     if (tmo_noerror = ((timeout = atoi(argv[++na])) < 0)) timeout = -timeout;
 230     }
 231   else if (strcmp(argv[na], "-i") == 0) initial_pause = atoi(argv[++na]);
 232   else if (strcmp(argv[na], "-noipv4") == 0) use_ipv4 = 0;
 233   else if (strcmp(argv[na], "-noipv6") == 0) use_ipv6 = 0;
 234   else if (strcmp(argv[na], "-oP") == 0) pidfile = argv[++na];
 235   else
 236     {
 237     printf("server: unknown option %s, try -h or --help\n", argv[na]);
 238     exit(1);
 239     }
 240   na++;
 241   }
 242
 243 if (!use_ipv4 && !use_ipv6)
 244   {
 245   printf("server: -noipv4 and -noipv6 cannot both be given\n");
 246   exit(1);
 247   }
 248
 249 if (na >= argc)
 250   {
 251   printf("server: no port number or socket name given\n");
 252   exit(1);
 253   }
 254
 255 if (argv[na][0] == '/')
 256   {
 257   sockname = argv[na];
 258   unlink(sockname);       /* in case left lying around */
 259   }
 260 else port = atoi(argv[na]);
 261 na++;
 262
 263 if (na < argc) connection_count = atoi(argv[na]);
 264
 265
 266 /* Initial pause (before creating listen sockets */
 267 if (initial_pause > 0)
 268   {
 269   if (debug)
 270     printf("%d: Inital pause of %d seconds\n", time(NULL), initial_pause);
 271   else
 272     printf("Inital pause of %d seconds\n", initial_pause);
 273   while (initial_pause > 0)
 274     initial_pause = sleep(initial_pause);
 275   }
 276
 277 /* Create sockets */
 278
 279 if (port == 0)  /* Unix domain */
 280   {
 281   if (debug) printf("%d: Creating Unix domain socket\n", time(NULL));
 282   listen_socket[udn] = socket(PF_UNIX, SOCK_STREAM, 0);
 283   if (listen_socket[udn] < 0)
 284     {
 285     printf("Unix domain socket creation failed: %s\n", strerror(errno));
 286     exit(1);
 287     }
 288   }
 289 else
 290   {
 291   #if HAVE_IPV6
 292   if (use_ipv6)
 293     {
 294     if (debug) printf("Creating IPv6 socket\n");
 295     listen_socket[v6n] = socket(AF_INET6, SOCK_STREAM, 0);
 296     if (listen_socket[v6n] < 0)
 297       {
 298       printf("IPv6 socket creation failed: %s\n", strerror(errno));
 299       exit(1);
 300       }
 301 #ifdef TCP_FASTOPEN
 302     if (tfo)
 303       {
 304       int backlog = 5;
 305       if (setsockopt(listen_socket[v6n], IPPROTO_TCP, TCP_FASTOPEN,
 306                     &backlog, sizeof(backlog)))
 307         if (debug) printf("setsockopt TCP_FASTOPEN: %s\n", strerror(errno));
 308       }
 309 #endif
 310     /* If this is an IPv6 wildcard socket, set IPV6_V6ONLY if that option is
 311     available. */
 312
 313     #ifdef IPV6_V6ONLY
 314     if (setsockopt(listen_socket[v6n], IPPROTO_IPV6, IPV6_V6ONLY, (char *)(&on),
 315           sizeof(on)) < 0)
 316       printf("Setting IPV6_V6ONLY on IPv6 wildcard "
 317         "socket failed (%s): carrying on without it\n", strerror(errno));
 318     #endif  /* IPV6_V6ONLY */
 319     }
 320   #endif  /* HAVE_IPV6 */
 321
 322   /* Create an IPv4 socket if required */
 323
 324   if (use_ipv4)
 325     {
 326     if (debug) printf("Creating IPv4 socket\n");
 327     listen_socket[v4n] = socket(AF_INET, SOCK_STREAM, 0);
 328     if (listen_socket[v4n] < 0)
 329       {
 330       printf("IPv4 socket creation failed: %s\n", strerror(errno));
 331       exit(1);
 332       }
 333 #ifdef TCP_FASTOPEN
 334     if (tfo)
 335       {
 336       int backlog = 5;
 337       if (setsockopt(listen_socket[v4n], IPPROTO_TCP, TCP_FASTOPEN,
 338                     &backlog, sizeof(backlog)))
 339         if (debug) printf("setsockopt TCP_FASTOPEN: %s\n", strerror(errno));
 340       }
 341 #endif
 342     }
 343   }
 344
 345
 346 /* Set SO_REUSEADDR on the IP sockets so that the program can be restarted
 347 while a connection is being handled - this can happen as old connections lie
 348 around for a bit while crashed processes are tidied away.  Without this, a
 349 connection will prevent reuse of the smtp port for listening. */
 350
 351 for (i = v6n; i <= v4n; i++)
 352   {
 353   if (listen_socket[i] >= 0 &&
 354       setsockopt(listen_socket[i], SOL_SOCKET, SO_REUSEADDR, (char *)(&on),
 355         sizeof(on)) < 0)
 356     {
 357     printf("setting SO_REUSEADDR on socket failed: %s\n", strerror(errno));
 358     exit(1);
 359     }
 360   }
 361
 362
 363 /* Now bind the sockets to the required port or path. If a path, ensure
 364 anyone can write to it. */
 365
 366 if (port == 0)
 367   {
 368   struct stat statbuf;
 369   sockun.sun_family = AF_UNIX;
 370   if (debug) printf("Binding Unix domain socket\n");
 371   sprintf(sockun.sun_path, "%.*s", (int)(sizeof(sockun.sun_path)-1), sockname);
 372   if (bind(listen_socket[udn], (struct sockaddr *)&sockun, sizeof(sockun)) < 0)
 373     {
 374     printf("Unix domain socket bind() failed: %s\n", strerror(errno));
 375     exit(1);
 376     }
 377   (void)stat(sockname, &statbuf);
 378   if (debug) printf("Setting Unix domain socket mode: %0x\n",
 379     statbuf.st_mode | 0777);
 380   if (chmod(sockname, statbuf.st_mode | 0777) < 0)
 381     {
 382     printf("Unix domain socket chmod() failed: %s\n", strerror(errno));
 383     exit(1);
 384     }
 385   }
 386
 387 else
 388   {
 389   for (i = 0; i < skn; i++)
 390     {
 391     if (listen_socket[i] < 0) continue;
 392
 393     /* For an IPv6 listen, use an IPv6 socket */
 394
 395     #if HAVE_IPV6
 396     if (i == v6n)
 397       {
 398       memset(&sin6, 0, sizeof(sin6));
 399       sin6.sin6_family = AF_INET6;
 400       sin6.sin6_port = htons(port);
 401       sin6.sin6_addr = anyaddr6;
 402       if (bind(listen_socket[i], (struct sockaddr *)&sin6, sizeof(sin6)) < 0)
 403         {
 404         printf("IPv6 socket bind(port %d) failed: %s\n", port, strerror(errno));
 405         exit(1);
 406         }
 407       }
 408     else
 409     #endif
 410
 411     /* For an IPv4 bind, use an IPv4 socket, even in an IPv6 world. If an IPv4
 412     bind fails EADDRINUSE after IPv6 success, carry on, because it means the
 413     IPv6 socket will handle IPv4 connections. */
 414
 415       {
 416       memset(&sin4, 0, sizeof(sin4));
 417       sin4.sin_family = AF_INET;
 418       sin4.sin_addr.s_addr = (S_ADDR_TYPE)INADDR_ANY;
 419       sin4.sin_port = htons(port);
 420       if (bind(listen_socket[i], (struct sockaddr *)&sin4, sizeof(sin4)) < 0)
 421         if (listen_socket[v6n] < 0 || errno != EADDRINUSE)
 422           {
 423           printf("IPv4 socket bind(port %d) failed: %s\n", port, strerror(errno));
 424           exit(1);
 425           }
 426         else
 427           {
 428           close(listen_socket[i]);
 429           listen_socket[i] = -1;
 430           }
 431       }
 432     }
 433   }
 434
 435
 436 /* Start listening. If IPv4 fails EADDRINUSE after IPv6 succeeds, ignore the
 437 error because it means that the IPv6 socket will handle IPv4 connections. Don't
 438 output anything, because it will mess up the test output, which will be
 439 different for systems that do this and those that don't. */
 440
 441 for (i = 0; i <= skn; i++)
 442   {
 443   if (listen_socket[i] >= 0 && listen(listen_socket[i], 5) < 0)
 444     {
 445     if (i != v4n || listen_socket[v6n] < 0 || errno != EADDRINUSE)
 446       {
 447       printf("listen() failed: %s\n", strerror(errno));
 448       exit(1);
 449       }
 450     }
 451   }
 452
 453
 454 if (pidfile)
 455   {
 456   FILE * p;
 457   if (!(p = fopen(pidfile, "w")))
 458     {
 459     fprintf(stderr, "pidfile create failed: %s\n", strerror(errno));
 460     exit(1);
 461     }
 462   fprintf(p, "%ld\n", (long)getpid());
 463   fclose(p);
 464   }
 465
 466 /* This program handles only a fixed number of connections, in sequence. Before
 467 waiting for the first connection, read the standard input, which contains the
 468 script of things to do. A line containing "++++" is treated as end of file.
 469 This is so that the Perl driving script doesn't have to close the pipe -
 470 because that would cause it to wait for this process, which it doesn't yet want
 471 to do. The driving script adds the "++++" automatically - it doesn't actually
 472 appear in the test script. Within lines we interpret \xNN and \\ groups */
 473
 474 while (fgets(CS buffer, sizeof(buffer), stdin) != NULL)
 475   {
 476   line *next;
 477   char * d;
 478   int n = (int)strlen(CS buffer);
 479
 480   if (n > 1 && buffer[0] == '>' && buffer[1] == '>')
 481     linebuf = 0;
 482   while (n > 0 && isspace(buffer[n-1])) n--;
 483   buffer[n] = 0;
 484   if (strcmp(CS buffer, "++++") == 0) break;
 485   next = malloc(sizeof(line) + n);
 486   next->next = NULL;
 487   d = next->line;
 488     {
 489     char * s = CS buffer;
 490     do
 491       {
 492       char ch;
 493       char cl = *s;
 494       if (cl == '\\' && (cl = *++s) == 'x')
 495         {
 496         if ((ch = *++s - '0') > 9 && (ch -= 'A'-'9'-1) > 15) ch -= 'a'-'A';
 497         if ((cl = *++s - '0') > 9 && (cl -= 'A'-'9'-1) > 15) cl -= 'a'-'A';
 498         cl |= ch << 4;
 499         }
 500       *d++ = cl;
 501       }
 502     while (*s++);
 503     }
 504   next->len = d - next->line - 1;
 505   if (last == NULL) script = last = next;
 506     else last->next = next;
 507   last = next;
 508   }
 509
 510 fclose(stdin);
 511
 512 /* SIGALRM handler crashes out */
 513
 514 signal(SIGALRM, sigalrm_handler);
 515
 516 /* s points to the current place in the script */
 517
 518 s = script;
 519
 520 for (count = 0; count < connection_count; count++)
 521   {
 522   struct {
 523     int left;
 524     BOOL in_use;
 525   } content_length = { 0, FALSE };
 526
 527   alarm(timeout);
 528   if (port <= 0)
 529     {
 530     printf("Listening on %s ... ", sockname);
 531     fflush(stdout);
 532     accept_socket = accept(listen_socket[udn],
 533       (struct sockaddr *)&sockun_accepted, &sockun_len);
 534     }
 535
 536   else
 537     {
 538     int lcount;
 539     int max_socket = 0;
 540     fd_set select_listen;
 541
 542     printf("Listening on port %d ... ", port);
 543     fflush(stdout);
 544
 545     FD_ZERO(&select_listen);
 546     for (i = 0; i < skn; i++)
 547       {
 548       if (listen_socket[i] >= 0) FD_SET(listen_socket[i], &select_listen);
 549       if (listen_socket[i] > max_socket) max_socket = listen_socket[i];
 550       }
 551
 552     if ((lcount = select(max_socket + 1, &select_listen, NULL, NULL, NULL)) < 0)
 553       {
 554       printf("Select failed\n");
 555       fflush(stdout);
 556       continue;
 557       }
 558
 559     accept_socket = -1;
 560     for (i = 0; i < skn; i++)
 561       if (listen_socket[i] > 0 && FD_ISSET(listen_socket[i], &select_listen))
 562         {
 563         accept_socket = accept(listen_socket[i],
 564           (struct sockaddr *)&accepted, &len);
 565         FD_CLR(listen_socket[i], &select_listen);
 566         break;
 567         }
 568     }
 569   alarm(0);
 570
 571   if (accept_socket < 0)
 572     {
 573     printf("accept() failed: %s\n", strerror(errno));
 574     exit(1);
 575     }
 576
 577   out = fdopen(accept_socket, "w");
 578
 579   dup_accept_socket = dup(accept_socket);
 580
 581   if (port > 0)
 582     printf("\nConnection request from [%s]\n", host_ntoa(&accepted, CS buffer));
 583   else
 584     {
 585     printf("\nConnection request\n");
 586
 587     /* Linux supports a feature for acquiring the peer's credentials, but it
 588     appears to be Linux-specific. This code is untested and unused, just
 589     saved here for reference. */
 590
 591     /**********--------------------
 592     struct ucred cr;
 593     int cl=sizeof(cr);
 594
 595     if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &cr, &cl)==0) {
 596       printf("Peer's pid=%d, uid=%d, gid=%d\n",
 597               cr.pid, cr.uid, cr.gid);
 598     --------------*****************/
 599     }
 600   fflush(stdout);
 601
 602   if (dup_accept_socket < 0)
 603     {
 604     printf("Couldn't dup socket descriptor\n");
 605     printf("421 Connection refused: %s\n", strerror(errno));
 606     fprintf(out, "421 Connection refused: %s\r\n", strerror(errno));
 607     fclose(out);
 608     exit(2);
 609     }
 610
 611   in = fdopen(dup_accept_socket, "r");
 612
 613   /* Loop for handling the conversation(s). For use in SMTP sessions, there are
 614   default rules for determining input and output lines: the latter start with
 615   digits. This means that the input looks like SMTP dialog. However, this
 616   doesn't work for other tests (e.g. ident tests) so we have explicit '<' and
 617   '>' flags for input and output as well as the defaults. */
 618
 619   for (; s; s = s->next)
 620     {
 621     char *ss = s->line;
 622
 623     /* Output lines either start with '>' or a digit. In the '>' case we can
 624     fudge the sending of \r\n as required. Default is \r\n, ">>" send nothing,
 625     ">CR>" sends \r only, and ">LF>" sends \n only. We can also force a
 626     connection closedown by ">*eof". */
 627
 628     if (ss[0] == '>')
 629       {
 630       char *end = "\r\n";
 631       unsigned len = s->len;
 632       printit(ss++, len--);
 633
 634       if (strncmp(ss, "*eof", 4) == 0)
 635         {
 636         s = s->next;
 637         goto END_OFF;
 638         }
 639
 640       if (*ss == '>')
 641         { end = ""; ss++; len--; }
 642       else if (strncmp(ss, "CR>", 3) == 0)
 643         { end = "\r"; ss += 3; len -= 3; }
 644       else if (strncmp(ss, "LF>", 3) == 0)
 645         { end = "\n"; ss += 3; len -= 3; }
 646
 647       fwrite(ss, 1, len, out);
 648       if (*end) fprintf(out, end);
 649       }
 650
 651     else if (isdigit((unsigned char)ss[0]))
 652       {
 653       printf("%s\n", ss);
 654       fprintf(out, "%s\r\n", ss);
 655       }
 656
 657     /* If the script line starts with "*sleep" we just sleep for a while
 658     before continuing. */
 659
 660     else if (strncmp(ss, "*sleep ", 7) == 0)
 661       {
 662       int sleepfor = atoi(ss+7);
 663       printf("%s\n", ss);
 664       fflush(out);
 665       sleep(sleepfor);
 666       }
 667
 668     /* If the script line starts with "*data " we expect a numeric argument,
 669     and we expect to read (and discard) that many data bytes from the input. */
 670
 671     else if (strncmp(ss, "*data ", 6) == 0)
 672       {
 673       int dlen = atoi(ss+6);
 674       int n;
 675
 676       alarm(timeout);
 677
 678       if (!linebuf)
 679         while (dlen > 0)
 680           {
 681           n = dlen < sizeof(buffer) ? dlen : sizeof(buffer);
 682           if ((n = read(dup_accept_socket, CS buffer, n)) == 0)
 683             {
 684             printf("Unexpected EOF read from client\n");
 685             s = s->next;
 686             goto END_OFF;
 687             }
 688           dlen -= n;
 689           }
 690       else
 691         while (dlen-- > 0)
 692           if (fgetc(in) == EOF)
 693             {
 694             printf("Unexpected EOF read from client\n");
 695             s = s->next;
 696             goto END_OFF;
 697             }
 698       }
 699
 700     /* Otherwise the script line is the start of an input line we are expecting
 701     from the client, or "*eof" indicating we expect the client to close the
 702     connection. Read command line or data lines; the latter are indicated
 703     by the expected line being just ".". If the line starts with '<', that
 704     doesn't form part of the expected input. (This allows for incoming data
 705     starting with a digit.) If the line starts with '<<' we operate in
 706     unbuffered rather than line mode and assume that a single read gets the
 707     entire message. */
 708
 709     else
 710       {
 711       int offset;
 712       int data = strcmp(ss, ".") == 0;
 713
 714       if (ss[0] != '<')
 715         offset = 0;
 716       else
 717         {
 718         buffer[0] = '<';
 719         if (ss[1] != '<')
 720           offset = 1;
 721         else
 722           {
 723           buffer[1] = '<';
 724           offset = 2;
 725           }
 726         }
 727
 728       fflush(out);
 729
 730       if (!linebuf)
 731         {
 732         int n;
 733         char c;
 734
 735         alarm(timeout);
 736         n = read(dup_accept_socket, CS buffer+offset, s->len - offset);
 737         if (content_length.in_use) content_length.left -= n;
 738         if (n == 0)
 739           {
 740           printf("%sxpected EOF read from client\n",
 741             (strncmp(ss, "*eof", 4) == 0)? "E" : "Une");
 742           s = s->next;
 743           goto END_OFF;
 744           }
 745         if (offset != 2)
 746           while (read(dup_accept_socket, &c, 1) == 1 && c != '\n') ;
 747         alarm(0);
 748         n += offset;
 749
 750         printit(CS buffer, n);
 751
 752         if (data) do
 753           {
 754           n = (read(dup_accept_socket, &c, 1) == 1 && c == '.');
 755           if (content_length.in_use) content_length.left--;
 756           while (c != '\n' && read(dup_accept_socket, &c, 1) == 1)
 757             if (content_length.in_use) content_length.left--;
 758           } while (!n);
 759         else if (memcmp(ss, buffer, n) != 0)
 760           {
 761           printf("Comparison failed - bailing out\nExpected: ");
 762           printit(ss, n);
 763           break;
 764           }
 765         }
 766       else
 767         {
 768         for (;;)
 769           {
 770           int n;
 771           alarm(timeout);
 772           if (fgets(CS buffer+offset, sizeof(buffer)-offset, in) == NULL)
 773             {
 774             printf("%sxpected EOF read from client\n",
 775               (strncmp(ss, "*eof", 4) == 0)? "E" : "Une");
 776             s = s->next;
 777             goto END_OFF;
 778             }
 779           alarm(0);
 780           n = strlen(CS buffer);
 781           if (content_length.in_use) content_length.left -= (n - offset);
 782           while (n > 0 && isspace(buffer[n-1])) n--;
 783           buffer[n] = 0;
 784           printf("%s\n", buffer);
 785           if (!data || strcmp(CS buffer, ".") == 0) break;
 786           }
 787
 788         if (strncmp(ss, CS buffer, (int)strlen(ss)) != 0)
 789           {
 790           printf("Comparison failed - bailing out\n");
 791           printf("Expected: %s\n", ss);
 792           break;
 793           }
 794         }
 795
 796         if (sscanf(CCS buffer, "<Content-length: %d", &content_length.left))
 797           content_length.in_use = TRUE;
 798         if (content_length.in_use && content_length.left <= 0)
 799           shutdown(dup_accept_socket, SHUT_RD);
 800       }
 801     }
 802
 803   END_OFF:
 804   fclose(in);
 805   fclose(out);
 806   }
 807
 808 if (s == NULL) printf("End of script\n");
 809
 810 if (sockname) unlink(sockname);
 811 exit(0);
 812 }
 813
 814 /* End of server.c */