slirp/socket.c

   1 /*
   2  * Copyright (c) 1995 Danny Gasparovski.
   3  *
   4  * Please read the file COPYRIGHT for the
   5  * terms and conditions of the copyright.
   6  */
   7
   8 #define WANT_SYS_IOCTL_H
   9 #include <slirp.h>
  10 #include "ip_icmp.h"
  11 #include "main.h"
  12 #ifdef __sun__
  13 #include <sys/filio.h>
  14 #endif
  15
  16 static void sofcantrcvmore(struct socket *so);
  17 static void sofcantsendmore(struct socket *so);
  18
  19 #if 0
  20 static void
  21 so_init()
  22 {
  23         /* Nothing yet */
  24 }
  25 #endif
  26
  27 struct socket *
  28 solookup(head, laddr, lport, faddr, fport)
  29         struct socket *head;
  30         struct in_addr laddr;
  31         u_int lport;
  32         struct in_addr faddr;
  33         u_int fport;
  34 {
  35         struct socket *so;
  36
  37         for (so = head->so_next; so != head; so = so->so_next) {
  38                 if (so->so_lport == lport &&
  39                     so->so_laddr.s_addr == laddr.s_addr &&
  40                     so->so_faddr.s_addr == faddr.s_addr &&
  41                     so->so_fport == fport)
  42                    break;
  43         }
  44
  45         if (so == head)
  46            return (struct socket *)NULL;
  47         return so;
  48
  49 }
  50
  51 /*
  52  * Create a new socket, initialise the fields
  53  * It is the responsibility of the caller to
  54  * insque() it into the correct linked-list
  55  */
  56 struct socket *
  57 socreate()
  58 {
  59   struct socket *so;
  60
  61   so = (struct socket *)malloc(sizeof(struct socket));
  62   if(so) {
  63     memset(so, 0, sizeof(struct socket));
  64     so->so_state = SS_NOFDREF;
  65     so->s = -1;
  66   }
  67   return(so);
  68 }
  69
  70 /*
  71  * remque and free a socket, clobber cache
  72  */
  73 void
  74 sofree(so)
  75         struct socket *so;
  76 {
  77   if (so->so_emu==EMU_RSH && so->extra) {
  78         sofree(so->extra);
  79         so->extra=NULL;
  80   }
  81   if (so == tcp_last_so)
  82     tcp_last_so = &tcb;
  83   else if (so == udp_last_so)
  84     udp_last_so = &udb;
  85
  86   m_free(so->so_m);
  87
  88   if(so->so_next && so->so_prev)
  89     remque(so);  /* crashes if so is not in a queue */
  90
  91   free(so);
  92 }
  93
  94 /*
  95  * Read from so's socket into sb_snd, updating all relevant sbuf fields
  96  * NOTE: This will only be called if it is select()ed for reading, so
  97  * a read() of 0 (or less) means it's disconnected
  98  */
  99 int
 100 soread(so)
 101         struct socket *so;
 102 {
 103         int n, nn, lss, total;
 104         struct sbuf *sb = &so->so_snd;
 105         int len = sb->sb_datalen - sb->sb_cc;
 106         struct iovec iov[2];
 107         int mss = so->so_tcpcb->t_maxseg;
 108
 109         DEBUG_CALL("soread");
 110         DEBUG_ARG("so = %lx", (long )so);
 111
 112         /*
 113          * No need to check if there's enough room to read.
 114          * soread wouldn't have been called if there weren't
 115          */
 116
 117         len = sb->sb_datalen - sb->sb_cc;
 118
 119         iov[0].iov_base = sb->sb_wptr;
 120         if (sb->sb_wptr < sb->sb_rptr) {
 121                 iov[0].iov_len = sb->sb_rptr - sb->sb_wptr;
 122                 /* Should never succeed, but... */
 123                 if (iov[0].iov_len > len)
 124                    iov[0].iov_len = len;
 125                 if (iov[0].iov_len > mss)
 126                    iov[0].iov_len -= iov[0].iov_len%mss;
 127                 n = 1;
 128         } else {
 129                 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_wptr;
 130                 /* Should never succeed, but... */
 131                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 132                 len -= iov[0].iov_len;
 133                 if (len) {
 134                         iov[1].iov_base = sb->sb_data;
 135                         iov[1].iov_len = sb->sb_rptr - sb->sb_data;
 136                         if(iov[1].iov_len > len)
 137                            iov[1].iov_len = len;
 138                         total = iov[0].iov_len + iov[1].iov_len;
 139                         if (total > mss) {
 140                                 lss = total%mss;
 141                                 if (iov[1].iov_len > lss) {
 142                                         iov[1].iov_len -= lss;
 143                                         n = 2;
 144                                 } else {
 145                                         lss -= iov[1].iov_len;
 146                                         iov[0].iov_len -= lss;
 147                                         n = 1;
 148                                 }
 149                         } else
 150                                 n = 2;
 151                 } else {
 152                         if (iov[0].iov_len > mss)
 153                            iov[0].iov_len -= iov[0].iov_len%mss;
 154                         n = 1;
 155                 }
 156         }
 157
 158 #ifdef HAVE_READV
 159         nn = readv(so->s, (struct iovec *)iov, n);
 160         DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
 161 #else
 162         nn = recv(so->s, iov[0].iov_base, iov[0].iov_len,0);
 163 #endif
 164         if (nn <= 0) {
 165                 if (nn < 0 && (errno == EINTR || errno == EAGAIN))
 166                         return 0;
 167                 else {
 168                         DEBUG_MISC((dfd, " --- soread() disconnected, nn = %d, errno = %d-%s\n", nn, errno,strerror(errno)));
 169                         sofcantrcvmore(so);
 170                         tcp_sockclosed(sototcpcb(so));
 171                         return -1;
 172                 }
 173         }
 174
 175 #ifndef HAVE_READV
 176         /*
 177          * If there was no error, try and read the second time round
 178          * We read again if n = 2 (ie, there's another part of the buffer)
 179          * and we read as much as we could in the first read
 180          * We don't test for <= 0 this time, because there legitimately
 181          * might not be any more data (since the socket is non-blocking),
 182          * a close will be detected on next iteration.
 183          * A return of -1 wont (shouldn't) happen, since it didn't happen above
 184          */
 185         if (n == 2 && nn == iov[0].iov_len) {
 186             int ret;
 187             ret = recv(so->s, iov[1].iov_base, iov[1].iov_len,0);
 188             if (ret > 0)
 189                 nn += ret;
 190         }
 191
 192         DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
 193 #endif
 194
 195         /* Update fields */
 196         sb->sb_cc += nn;
 197         sb->sb_wptr += nn;
 198         if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
 199                 sb->sb_wptr -= sb->sb_datalen;
 200         return nn;
 201 }
 202
 203 /*
 204  * Get urgent data
 205  *
 206  * When the socket is created, we set it SO_OOBINLINE,
 207  * so when OOB data arrives, we soread() it and everything
 208  * in the send buffer is sent as urgent data
 209  */
 210 void
 211 sorecvoob(so)
 212         struct socket *so;
 213 {
 214         struct tcpcb *tp = sototcpcb(so);
 215
 216         DEBUG_CALL("sorecvoob");
 217         DEBUG_ARG("so = %lx", (long)so);
 218
 219         /*
 220          * We take a guess at how much urgent data has arrived.
 221          * In most situations, when urgent data arrives, the next
 222          * read() should get all the urgent data.  This guess will
 223          * be wrong however if more data arrives just after the
 224          * urgent data, or the read() doesn't return all the
 225          * urgent data.
 226          */
 227         soread(so);
 228         tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
 229         tp->t_force = 1;
 230         tcp_output(tp);
 231         tp->t_force = 0;
 232 }
 233
 234 /*
 235  * Send urgent data
 236  * There's a lot duplicated code here, but...
 237  */
 238 int
 239 sosendoob(so)
 240         struct socket *so;
 241 {
 242         struct sbuf *sb = &so->so_rcv;
 243         char buff[2048]; /* XXX Shouldn't be sending more oob data than this */
 244
 245         int n, len;
 246
 247         DEBUG_CALL("sosendoob");
 248         DEBUG_ARG("so = %lx", (long)so);
 249         DEBUG_ARG("sb->sb_cc = %d", sb->sb_cc);
 250
 251         if (so->so_urgc > 2048)
 252            so->so_urgc = 2048; /* XXXX */
 253
 254         if (sb->sb_rptr < sb->sb_wptr) {
 255                 /* We can send it directly */
 256                 n = send(so->s, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */
 257                 so->so_urgc -= n;
 258
 259                 DEBUG_MISC((dfd, " --- sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
 260         } else {
 261                 /*
 262                  * Since there's no sendv or sendtov like writev,
 263                  * we must copy all data to a linear buffer then
 264                  * send it all
 265                  */
 266                 len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
 267                 if (len > so->so_urgc) len = so->so_urgc;
 268                 memcpy(buff, sb->sb_rptr, len);
 269                 so->so_urgc -= len;
 270                 if (so->so_urgc) {
 271                         n = sb->sb_wptr - sb->sb_data;
 272                         if (n > so->so_urgc) n = so->so_urgc;
 273                         memcpy((buff + len), sb->sb_data, n);
 274                         so->so_urgc -= n;
 275                         len += n;
 276                 }
 277                 n = send(so->s, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */
 278 #ifdef DEBUG
 279                 if (n != len)
 280                    DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n"));
 281 #endif
 282                 DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
 283         }
 284
 285         sb->sb_cc -= n;
 286         sb->sb_rptr += n;
 287         if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
 288                 sb->sb_rptr -= sb->sb_datalen;
 289
 290         return n;
 291 }
 292
 293 /*
 294  * Write data from so_rcv to so's socket,
 295  * updating all sbuf field as necessary
 296  */
 297 int
 298 sowrite(so)
 299         struct socket *so;
 300 {
 301         int  n,nn;
 302         struct sbuf *sb = &so->so_rcv;
 303         int len = sb->sb_cc;
 304         struct iovec iov[2];
 305
 306         DEBUG_CALL("sowrite");
 307         DEBUG_ARG("so = %lx", (long)so);
 308
 309         if (so->so_urgc) {
 310                 sosendoob(so);
 311                 if (sb->sb_cc == 0)
 312                         return 0;
 313         }
 314
 315         /*
 316          * No need to check if there's something to write,
 317          * sowrite wouldn't have been called otherwise
 318          */
 319
 320         len = sb->sb_cc;
 321
 322         iov[0].iov_base = sb->sb_rptr;
 323         if (sb->sb_rptr < sb->sb_wptr) {
 324                 iov[0].iov_len = sb->sb_wptr - sb->sb_rptr;
 325                 /* Should never succeed, but... */
 326                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 327                 n = 1;
 328         } else {
 329                 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
 330                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 331                 len -= iov[0].iov_len;
 332                 if (len) {
 333                         iov[1].iov_base = sb->sb_data;
 334                         iov[1].iov_len = sb->sb_wptr - sb->sb_data;
 335                         if (iov[1].iov_len > len) iov[1].iov_len = len;
 336                         n = 2;
 337                 } else
 338                         n = 1;
 339         }
 340         /* Check if there's urgent data to send, and if so, send it */
 341
 342 #ifdef HAVE_READV
 343         nn = writev(so->s, (const struct iovec *)iov, n);
 344
 345         DEBUG_MISC((dfd, "  ... wrote nn = %d bytes\n", nn));
 346 #else
 347         nn = send(so->s, iov[0].iov_base, iov[0].iov_len,0);
 348 #endif
 349         /* This should never happen, but people tell me it does *shrug* */
 350         if (nn < 0 && (errno == EAGAIN || errno == EINTR))
 351                 return 0;
 352
 353         if (nn <= 0) {
 354                 DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n",
 355                         so->so_state, errno));
 356                 sofcantsendmore(so);
 357                 tcp_sockclosed(sototcpcb(so));
 358                 return -1;
 359         }
 360
 361 #ifndef HAVE_READV
 362         if (n == 2 && nn == iov[0].iov_len) {
 363             int ret;
 364             ret = send(so->s, iov[1].iov_base, iov[1].iov_len,0);
 365             if (ret > 0)
 366                 nn += ret;
 367         }
 368         DEBUG_MISC((dfd, "  ... wrote nn = %d bytes\n", nn));
 369 #endif
 370
 371         /* Update sbuf */
 372         sb->sb_cc -= nn;
 373         sb->sb_rptr += nn;
 374         if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
 375                 sb->sb_rptr -= sb->sb_datalen;
 376
 377         /*
 378          * If in DRAIN mode, and there's no more data, set
 379          * it CANTSENDMORE
 380          */
 381         if ((so->so_state & SS_FWDRAIN) && sb->sb_cc == 0)
 382                 sofcantsendmore(so);
 383
 384         return nn;
 385 }
 386
 387 /*
 388  * recvfrom() a UDP socket
 389  */
 390 void
 391 sorecvfrom(so)
 392         struct socket *so;
 393 {
 394         struct sockaddr_in addr;
 395         int addrlen = sizeof(struct sockaddr_in);
 396
 397         DEBUG_CALL("sorecvfrom");
 398         DEBUG_ARG("so = %lx", (long)so);
 399
 400         if (so->so_type == IPPROTO_ICMP) {   /* This is a "ping" reply */
 401           char buff[256];
 402           int len;
 403
 404           len = recvfrom(so->s, buff, 256, 0,
 405                          (struct sockaddr *)&addr, &addrlen);
 406           /* XXX Check if reply is "correct"? */
 407
 408           if(len == -1 || len == 0) {
 409             u_char code=ICMP_UNREACH_PORT;
 410
 411             if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
 412             else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
 413
 414             DEBUG_MISC((dfd," udp icmp rx errno = %d-%s\n",
 415                         errno,strerror(errno)));
 416             icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
 417           } else {
 418             icmp_reflect(so->so_m);
 419             so->so_m = 0; /* Don't m_free() it again! */
 420           }
 421           /* No need for this socket anymore, udp_detach it */
 422           udp_detach(so);
 423         } else {                                /* A "normal" UDP packet */
 424           struct mbuf *m;
 425           int len, n;
 426
 427           if (!(m = m_get())) return;
 428           m->m_data += IF_MAXLINKHDR;
 429
 430           /*
 431            * XXX Shouldn't FIONREAD packets destined for port 53,
 432            * but I don't know the max packet size for DNS lookups
 433            */
 434           len = M_FREEROOM(m);
 435           /* if (so->so_fport != htons(53)) { */
 436           ioctlsocket(so->s, FIONREAD, &n);
 437
 438           if (n > len) {
 439             n = (m->m_data - m->m_dat) + m->m_len + n + 1;
 440             m_inc(m, n);
 441             len = M_FREEROOM(m);
 442           }
 443           /* } */
 444
 445           m->m_len = recvfrom(so->s, m->m_data, len, 0,
 446                               (struct sockaddr *)&addr, &addrlen);
 447           DEBUG_MISC((dfd, " did recvfrom %d, errno = %d-%s\n",
 448                       m->m_len, errno,strerror(errno)));
 449           if(m->m_len<0) {
 450             u_char code=ICMP_UNREACH_PORT;
 451
 452             if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
 453             else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
 454
 455             DEBUG_MISC((dfd," rx error, tx icmp ICMP_UNREACH:%i\n", code));
 456             icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
 457             m_free(m);
 458           } else {
 459           /*
 460            * Hack: domain name lookup will be used the most for UDP,
 461            * and since they'll only be used once there's no need
 462            * for the 4 minute (or whatever) timeout... So we time them
 463            * out much quicker (10 seconds  for now...)
 464            */
 465             if (so->so_expire) {
 466               if (so->so_fport == htons(53))
 467                 so->so_expire = curtime + SO_EXPIREFAST;
 468               else
 469                 so->so_expire = curtime + SO_EXPIRE;
 470             }
 471
 472             /*          if (m->m_len == len) {
 473              *                  m_inc(m, MINCSIZE);
 474              *                  m->m_len = 0;
 475              *          }
 476              */
 477
 478             /*
 479              * If this packet was destined for CTL_ADDR,
 480              * make it look like that's where it came from, done by udp_output
 481              */
 482             udp_output(so, m, &addr);
 483           } /* rx error */
 484         } /* if ping packet */
 485 }
 486
 487 /*
 488  * sendto() a socket
 489  */
 490 int
 491 sosendto(so, m)
 492         struct socket *so;
 493         struct mbuf *m;
 494 {
 495         int ret;
 496         struct sockaddr_in addr;
 497
 498         DEBUG_CALL("sosendto");
 499         DEBUG_ARG("so = %lx", (long)so);
 500         DEBUG_ARG("m = %lx", (long)m);
 501
 502         addr.sin_family = AF_INET;
 503         if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
 504           /* It's an alias */
 505           switch(ntohl(so->so_faddr.s_addr) & 0xff) {
 506           case CTL_DNS:
 507             addr.sin_addr = dns_addr;
 508             break;
 509           case CTL_ALIAS:
 510           default:
 511             addr.sin_addr = loopback_addr;
 512             break;
 513           }
 514         } else
 515           addr.sin_addr = so->so_faddr;
 516         addr.sin_port = so->so_fport;
 517
 518         DEBUG_MISC((dfd, " sendto()ing, addr.sin_port=%d, addr.sin_addr.s_addr=%.16s\n", ntohs(addr.sin_port), inet_ntoa(addr.sin_addr)));
 519
 520         /* Don't care what port we get */
 521         ret = sendto(so->s, m->m_data, m->m_len, 0,
 522                      (struct sockaddr *)&addr, sizeof (struct sockaddr));
 523         if (ret < 0)
 524                 return -1;
 525
 526         /*
 527          * Kill the socket if there's no reply in 4 minutes,
 528          * but only if it's an expirable socket
 529          */
 530         if (so->so_expire)
 531                 so->so_expire = curtime + SO_EXPIRE;
 532         so->so_state = SS_ISFCONNECTED; /* So that it gets select()ed */
 533         return 0;
 534 }
 535
 536 /*
 537  * XXX This should really be tcp_listen
 538  */
 539 struct socket *
 540 solisten(port, laddr, lport, flags)
 541         u_int port;
 542         u_int32_t laddr;
 543         u_int lport;
 544         int flags;
 545 {
 546         struct sockaddr_in addr;
 547         struct socket *so;
 548         int s, addrlen = sizeof(addr), opt = 1;
 549
 550         DEBUG_CALL("solisten");
 551         DEBUG_ARG("port = %d", port);
 552         DEBUG_ARG("laddr = %x", laddr);
 553         DEBUG_ARG("lport = %d", lport);
 554         DEBUG_ARG("flags = %x", flags);
 555
 556         if ((so = socreate()) == NULL) {
 557           /* free(so);      Not sofree() ??? free(NULL) == NOP */
 558           return NULL;
 559         }
 560
 561         /* Don't tcp_attach... we don't need so_snd nor so_rcv */
 562         if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) {
 563                 free(so);
 564                 return NULL;
 565         }
 566         insque(so,&tcb);
 567
 568         /*
 569          * SS_FACCEPTONCE sockets must time out.
 570          */
 571         if (flags & SS_FACCEPTONCE)
 572            so->so_tcpcb->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT*2;
 573
 574         so->so_state = (SS_FACCEPTCONN|flags);
 575         so->so_lport = lport; /* Kept in network format */
 576         so->so_laddr.s_addr = laddr; /* Ditto */
 577
 578         addr.sin_family = AF_INET;
 579         addr.sin_addr.s_addr = INADDR_ANY;
 580         addr.sin_port = port;
 581
 582         if (((s = socket(AF_INET,SOCK_STREAM,0)) < 0) ||
 583             (setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)) < 0) ||
 584             (bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0) ||
 585             (listen(s,1) < 0)) {
 586                 int tmperrno = errno; /* Don't clobber the real reason we failed */
 587
 588                 close(s);
 589                 sofree(so);
 590                 /* Restore the real errno */
 591 #ifdef _WIN32
 592                 WSASetLastError(tmperrno);
 593 #else
 594                 errno = tmperrno;
 595 #endif
 596                 return NULL;
 597         }
 598         setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
 599
 600         getsockname(s,(struct sockaddr *)&addr,&addrlen);
 601         so->so_fport = addr.sin_port;
 602         if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr)
 603            so->so_faddr = alias_addr;
 604         else
 605            so->so_faddr = addr.sin_addr;
 606
 607         so->s = s;
 608         return so;
 609 }
 610
 611 #if 0
 612 /*
 613  * Data is available in so_rcv
 614  * Just write() the data to the socket
 615  * XXX not yet...
 616  */
 617 static void
 618 sorwakeup(so)
 619         struct socket *so;
 620 {
 621 /*      sowrite(so); */
 622 /*      FD_CLR(so->s,&writefds); */
 623 }
 624
 625 /*
 626  * Data has been freed in so_snd
 627  * We have room for a read() if we want to
 628  * For now, don't read, it'll be done in the main loop
 629  */
 630 static void
 631 sowwakeup(so)
 632         struct socket *so;
 633 {
 634         /* Nothing, yet */
 635 }
 636 #endif
 637
 638 /*
 639  * Various session state calls
 640  * XXX Should be #define's
 641  * The socket state stuff needs work, these often get call 2 or 3
 642  * times each when only 1 was needed
 643  */
 644 void
 645 soisfconnecting(so)
 646         register struct socket *so;
 647 {
 648         so->so_state &= ~(SS_NOFDREF|SS_ISFCONNECTED|SS_FCANTRCVMORE|
 649                           SS_FCANTSENDMORE|SS_FWDRAIN);
 650         so->so_state |= SS_ISFCONNECTING; /* Clobber other states */
 651 }
 652
 653 void
 654 soisfconnected(so)
 655         register struct socket *so;
 656 {
 657         so->so_state &= ~(SS_ISFCONNECTING|SS_FWDRAIN|SS_NOFDREF);
 658         so->so_state |= SS_ISFCONNECTED; /* Clobber other states */
 659 }
 660
 661 static void
 662 sofcantrcvmore(struct socket *so)
 663 {
 664         if ((so->so_state & SS_NOFDREF) == 0) {
 665                 shutdown(so->s,0);
 666                 if(global_writefds) {
 667                   FD_CLR(so->s,global_writefds);
 668                 }
 669         }
 670         so->so_state &= ~(SS_ISFCONNECTING);
 671         if (so->so_state & SS_FCANTSENDMORE)
 672            so->so_state = SS_NOFDREF; /* Don't select it */ /* XXX close() here as well? */
 673         else
 674            so->so_state |= SS_FCANTRCVMORE;
 675 }
 676
 677 static void
 678 sofcantsendmore(struct socket *so)
 679 {
 680         if ((so->so_state & SS_NOFDREF) == 0) {
 681             shutdown(so->s,1);           /* send FIN to fhost */
 682             if (global_readfds) {
 683                 FD_CLR(so->s,global_readfds);
 684             }
 685             if (global_xfds) {
 686                 FD_CLR(so->s,global_xfds);
 687             }
 688         }
 689         so->so_state &= ~(SS_ISFCONNECTING);
 690         if (so->so_state & SS_FCANTRCVMORE)
 691            so->so_state = SS_NOFDREF; /* as above */
 692         else
 693            so->so_state |= SS_FCANTSENDMORE;
 694 }
 695
 696 void
 697 soisfdisconnected(so)
 698         struct socket *so;
 699 {
 700 /*      so->so_state &= ~(SS_ISFCONNECTING|SS_ISFCONNECTED); */
 701 /*      close(so->s); */
 702 /*      so->so_state = SS_ISFDISCONNECTED; */
 703         /*
 704          * XXX Do nothing ... ?
 705          */
 706 }
 707
 708 /*
 709  * Set write drain mode
 710  * Set CANTSENDMORE once all data has been write()n
 711  */
 712 void
 713 sofwdrain(so)
 714         struct socket *so;
 715 {
 716         if (so->so_rcv.sb_cc)
 717                 so->so_state |= SS_FWDRAIN;
 718         else
 719                 sofcantsendmore(so);
 720 }
 721