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 #ifdef __sun__
  12 #include <sys/filio.h>
  13 #endif
  14 #include "qemu-common.h"
  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         iov[1].iov_base = NULL;
 121         iov[1].iov_len = 0;
 122         if (sb->sb_wptr < sb->sb_rptr) {
 123                 iov[0].iov_len = sb->sb_rptr - sb->sb_wptr;
 124                 /* Should never succeed, but... */
 125                 if (iov[0].iov_len > len)
 126                    iov[0].iov_len = len;
 127                 if (iov[0].iov_len > mss)
 128                    iov[0].iov_len -= iov[0].iov_len%mss;
 129                 n = 1;
 130         } else {
 131                 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_wptr;
 132                 /* Should never succeed, but... */
 133                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 134                 len -= iov[0].iov_len;
 135                 if (len) {
 136                         iov[1].iov_base = sb->sb_data;
 137                         iov[1].iov_len = sb->sb_rptr - sb->sb_data;
 138                         if(iov[1].iov_len > len)
 139                            iov[1].iov_len = len;
 140                         total = iov[0].iov_len + iov[1].iov_len;
 141                         if (total > mss) {
 142                                 lss = total%mss;
 143                                 if (iov[1].iov_len > lss) {
 144                                         iov[1].iov_len -= lss;
 145                                         n = 2;
 146                                 } else {
 147                                         lss -= iov[1].iov_len;
 148                                         iov[0].iov_len -= lss;
 149                                         n = 1;
 150                                 }
 151                         } else
 152                                 n = 2;
 153                 } else {
 154                         if (iov[0].iov_len > mss)
 155                            iov[0].iov_len -= iov[0].iov_len%mss;
 156                         n = 1;
 157                 }
 158         }
 159
 160 #ifdef HAVE_READV
 161         nn = readv(so->s, (struct iovec *)iov, n);
 162         DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
 163 #else
 164         nn = recv(so->s, iov[0].iov_base, iov[0].iov_len,0);
 165 #endif
 166         if (nn <= 0) {
 167                 if (nn < 0 && (errno == EINTR || errno == EAGAIN))
 168                         return 0;
 169                 else {
 170                         DEBUG_MISC((dfd, " --- soread() disconnected, nn = %d, errno = %d-%s\n", nn, errno,strerror(errno)));
 171                         sofcantrcvmore(so);
 172                         tcp_sockclosed(sototcpcb(so));
 173                         return -1;
 174                 }
 175         }
 176
 177 #ifndef HAVE_READV
 178         /*
 179          * If there was no error, try and read the second time round
 180          * We read again if n = 2 (ie, there's another part of the buffer)
 181          * and we read as much as we could in the first read
 182          * We don't test for <= 0 this time, because there legitimately
 183          * might not be any more data (since the socket is non-blocking),
 184          * a close will be detected on next iteration.
 185          * A return of -1 wont (shouldn't) happen, since it didn't happen above
 186          */
 187         if (n == 2 && nn == iov[0].iov_len) {
 188             int ret;
 189             ret = recv(so->s, iov[1].iov_base, iov[1].iov_len,0);
 190             if (ret > 0)
 191                 nn += ret;
 192         }
 193
 194         DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
 195 #endif
 196
 197         /* Update fields */
 198         sb->sb_cc += nn;
 199         sb->sb_wptr += nn;
 200         if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
 201                 sb->sb_wptr -= sb->sb_datalen;
 202         return nn;
 203 }
 204
 205 /*
 206  * Get urgent data
 207  *
 208  * When the socket is created, we set it SO_OOBINLINE,
 209  * so when OOB data arrives, we soread() it and everything
 210  * in the send buffer is sent as urgent data
 211  */
 212 void
 213 sorecvoob(so)
 214         struct socket *so;
 215 {
 216         struct tcpcb *tp = sototcpcb(so);
 217
 218         DEBUG_CALL("sorecvoob");
 219         DEBUG_ARG("so = %lx", (long)so);
 220
 221         /*
 222          * We take a guess at how much urgent data has arrived.
 223          * In most situations, when urgent data arrives, the next
 224          * read() should get all the urgent data.  This guess will
 225          * be wrong however if more data arrives just after the
 226          * urgent data, or the read() doesn't return all the
 227          * urgent data.
 228          */
 229         soread(so);
 230         tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
 231         tp->t_force = 1;
 232         tcp_output(tp);
 233         tp->t_force = 0;
 234 }
 235
 236 /*
 237  * Send urgent data
 238  * There's a lot duplicated code here, but...
 239  */
 240 int
 241 sosendoob(so)
 242         struct socket *so;
 243 {
 244         struct sbuf *sb = &so->so_rcv;
 245         char buff[2048]; /* XXX Shouldn't be sending more oob data than this */
 246
 247         int n, len;
 248
 249         DEBUG_CALL("sosendoob");
 250         DEBUG_ARG("so = %lx", (long)so);
 251         DEBUG_ARG("sb->sb_cc = %d", sb->sb_cc);
 252
 253         if (so->so_urgc > 2048)
 254            so->so_urgc = 2048; /* XXXX */
 255
 256         if (sb->sb_rptr < sb->sb_wptr) {
 257                 /* We can send it directly */
 258                 n = send(so->s, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */
 259                 so->so_urgc -= n;
 260
 261                 DEBUG_MISC((dfd, " --- sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
 262         } else {
 263                 /*
 264                  * Since there's no sendv or sendtov like writev,
 265                  * we must copy all data to a linear buffer then
 266                  * send it all
 267                  */
 268                 len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
 269                 if (len > so->so_urgc) len = so->so_urgc;
 270                 memcpy(buff, sb->sb_rptr, len);
 271                 so->so_urgc -= len;
 272                 if (so->so_urgc) {
 273                         n = sb->sb_wptr - sb->sb_data;
 274                         if (n > so->so_urgc) n = so->so_urgc;
 275                         memcpy((buff + len), sb->sb_data, n);
 276                         so->so_urgc -= n;
 277                         len += n;
 278                 }
 279                 n = send(so->s, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */
 280 #ifdef DEBUG
 281                 if (n != len)
 282                    DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n"));
 283 #endif
 284                 DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
 285         }
 286
 287         sb->sb_cc -= n;
 288         sb->sb_rptr += n;
 289         if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
 290                 sb->sb_rptr -= sb->sb_datalen;
 291
 292         return n;
 293 }
 294
 295 /*
 296  * Write data from so_rcv to so's socket,
 297  * updating all sbuf field as necessary
 298  */
 299 int
 300 sowrite(so)
 301         struct socket *so;
 302 {
 303         int  n,nn;
 304         struct sbuf *sb = &so->so_rcv;
 305         int len = sb->sb_cc;
 306         struct iovec iov[2];
 307
 308         DEBUG_CALL("sowrite");
 309         DEBUG_ARG("so = %lx", (long)so);
 310
 311         if (so->so_urgc) {
 312                 sosendoob(so);
 313                 if (sb->sb_cc == 0)
 314                         return 0;
 315         }
 316
 317         /*
 318          * No need to check if there's something to write,
 319          * sowrite wouldn't have been called otherwise
 320          */
 321
 322         len = sb->sb_cc;
 323
 324         iov[0].iov_base = sb->sb_rptr;
 325         iov[1].iov_base = NULL;
 326         iov[1].iov_len = 0;
 327         if (sb->sb_rptr < sb->sb_wptr) {
 328                 iov[0].iov_len = sb->sb_wptr - sb->sb_rptr;
 329                 /* Should never succeed, but... */
 330                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 331                 n = 1;
 332         } else {
 333                 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
 334                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 335                 len -= iov[0].iov_len;
 336                 if (len) {
 337                         iov[1].iov_base = sb->sb_data;
 338                         iov[1].iov_len = sb->sb_wptr - sb->sb_data;
 339                         if (iov[1].iov_len > len) iov[1].iov_len = len;
 340                         n = 2;
 341                 } else
 342                         n = 1;
 343         }
 344         /* Check if there's urgent data to send, and if so, send it */
 345
 346 #ifdef HAVE_READV
 347         nn = writev(so->s, (const struct iovec *)iov, n);
 348
 349         DEBUG_MISC((dfd, "  ... wrote nn = %d bytes\n", nn));
 350 #else
 351         nn = send(so->s, iov[0].iov_base, iov[0].iov_len,0);
 352 #endif
 353         /* This should never happen, but people tell me it does *shrug* */
 354         if (nn < 0 && (errno == EAGAIN || errno == EINTR))
 355                 return 0;
 356
 357         if (nn <= 0) {
 358                 DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n",
 359                         so->so_state, errno));
 360                 sofcantsendmore(so);
 361                 tcp_sockclosed(sototcpcb(so));
 362                 return -1;
 363         }
 364
 365 #ifndef HAVE_READV
 366         if (n == 2 && nn == iov[0].iov_len) {
 367             int ret;
 368             ret = send(so->s, iov[1].iov_base, iov[1].iov_len,0);
 369             if (ret > 0)
 370                 nn += ret;
 371         }
 372         DEBUG_MISC((dfd, "  ... wrote nn = %d bytes\n", nn));
 373 #endif
 374
 375         /* Update sbuf */
 376         sb->sb_cc -= nn;
 377         sb->sb_rptr += nn;
 378         if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
 379                 sb->sb_rptr -= sb->sb_datalen;
 380
 381         /*
 382          * If in DRAIN mode, and there's no more data, set
 383          * it CANTSENDMORE
 384          */
 385         if ((so->so_state & SS_FWDRAIN) && sb->sb_cc == 0)
 386                 sofcantsendmore(so);
 387
 388         return nn;
 389 }
 390
 391 /*
 392  * recvfrom() a UDP socket
 393  */
 394 void
 395 sorecvfrom(so)
 396         struct socket *so;
 397 {
 398         struct sockaddr_in addr;
 399         socklen_t addrlen = sizeof(struct sockaddr_in);
 400
 401         DEBUG_CALL("sorecvfrom");
 402         DEBUG_ARG("so = %lx", (long)so);
 403
 404         if (so->so_type == IPPROTO_ICMP) {   /* This is a "ping" reply */
 405           char buff[256];
 406           int len;
 407
 408           len = recvfrom(so->s, buff, 256, 0,
 409                          (struct sockaddr *)&addr, &addrlen);
 410           /* XXX Check if reply is "correct"? */
 411
 412           if(len == -1 || len == 0) {
 413             u_char code=ICMP_UNREACH_PORT;
 414
 415             if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
 416             else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
 417
 418             DEBUG_MISC((dfd," udp icmp rx errno = %d-%s\n",
 419                         errno,strerror(errno)));
 420             icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
 421           } else {
 422             icmp_reflect(so->so_m);
 423             so->so_m = 0; /* Don't m_free() it again! */
 424           }
 425           /* No need for this socket anymore, udp_detach it */
 426           udp_detach(so);
 427         } else {                                /* A "normal" UDP packet */
 428           struct mbuf *m;
 429           int len, n;
 430
 431           if (!(m = m_get())) return;
 432           m->m_data += IF_MAXLINKHDR;
 433
 434           /*
 435            * XXX Shouldn't FIONREAD packets destined for port 53,
 436            * but I don't know the max packet size for DNS lookups
 437            */
 438           len = M_FREEROOM(m);
 439           /* if (so->so_fport != htons(53)) { */
 440           ioctlsocket(so->s, FIONREAD, &n);
 441
 442           if (n > len) {
 443             n = (m->m_data - m->m_dat) + m->m_len + n + 1;
 444             m_inc(m, n);
 445             len = M_FREEROOM(m);
 446           }
 447           /* } */
 448
 449           m->m_len = recvfrom(so->s, m->m_data, len, 0,
 450                               (struct sockaddr *)&addr, &addrlen);
 451           DEBUG_MISC((dfd, " did recvfrom %d, errno = %d-%s\n",
 452                       m->m_len, errno,strerror(errno)));
 453           if(m->m_len<0) {
 454             u_char code=ICMP_UNREACH_PORT;
 455
 456             if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
 457             else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
 458
 459             DEBUG_MISC((dfd," rx error, tx icmp ICMP_UNREACH:%i\n", code));
 460             icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
 461             m_free(m);
 462           } else {
 463           /*
 464            * Hack: domain name lookup will be used the most for UDP,
 465            * and since they'll only be used once there's no need
 466            * for the 4 minute (or whatever) timeout... So we time them
 467            * out much quicker (10 seconds  for now...)
 468            */
 469             if (so->so_expire) {
 470               if (so->so_fport == htons(53))
 471                 so->so_expire = curtime + SO_EXPIREFAST;
 472               else
 473                 so->so_expire = curtime + SO_EXPIRE;
 474             }
 475
 476             /*          if (m->m_len == len) {
 477              *                  m_inc(m, MINCSIZE);
 478              *                  m->m_len = 0;
 479              *          }
 480              */
 481
 482             /*
 483              * If this packet was destined for CTL_ADDR,
 484              * make it look like that's where it came from, done by udp_output
 485              */
 486             udp_output(so, m, &addr);
 487           } /* rx error */
 488         } /* if ping packet */
 489 }
 490
 491 /*
 492  * sendto() a socket
 493  */
 494 int
 495 sosendto(so, m)
 496         struct socket *so;
 497         struct mbuf *m;
 498 {
 499         int ret;
 500         struct sockaddr_in addr;
 501
 502         DEBUG_CALL("sosendto");
 503         DEBUG_ARG("so = %lx", (long)so);
 504         DEBUG_ARG("m = %lx", (long)m);
 505
 506         addr.sin_family = AF_INET;
 507         if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
 508           /* It's an alias */
 509           switch(ntohl(so->so_faddr.s_addr) & 0xff) {
 510           case CTL_DNS:
 511             addr.sin_addr = dns_addr;
 512             break;
 513           case CTL_ALIAS:
 514           default:
 515             addr.sin_addr = loopback_addr;
 516             break;
 517           }
 518         } else
 519           addr.sin_addr = so->so_faddr;
 520         addr.sin_port = so->so_fport;
 521
 522         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)));
 523
 524         /* Don't care what port we get */
 525         ret = sendto(so->s, m->m_data, m->m_len, 0,
 526                      (struct sockaddr *)&addr, sizeof (struct sockaddr));
 527         if (ret < 0)
 528                 return -1;
 529
 530         /*
 531          * Kill the socket if there's no reply in 4 minutes,
 532          * but only if it's an expirable socket
 533          */
 534         if (so->so_expire)
 535                 so->so_expire = curtime + SO_EXPIRE;
 536         so->so_state = SS_ISFCONNECTED; /* So that it gets select()ed */
 537         return 0;
 538 }
 539
 540 /*
 541  * XXX This should really be tcp_listen
 542  */
 543 struct socket *
 544 solisten(port, laddr, lport, flags)
 545         u_int port;
 546         u_int32_t laddr;
 547         u_int lport;
 548         int flags;
 549 {
 550         struct sockaddr_in addr;
 551         struct socket *so;
 552         int s, opt = 1;
 553         socklen_t addrlen = sizeof(addr);
 554
 555         DEBUG_CALL("solisten");
 556         DEBUG_ARG("port = %d", port);
 557         DEBUG_ARG("laddr = %x", laddr);
 558         DEBUG_ARG("lport = %d", lport);
 559         DEBUG_ARG("flags = %x", flags);
 560
 561         if ((so = socreate()) == NULL) {
 562           /* free(so);      Not sofree() ??? free(NULL) == NOP */
 563           return NULL;
 564         }
 565
 566         /* Don't tcp_attach... we don't need so_snd nor so_rcv */
 567         if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) {
 568                 free(so);
 569                 return NULL;
 570         }
 571         insque(so,&tcb);
 572
 573         /*
 574          * SS_FACCEPTONCE sockets must time out.
 575          */
 576         if (flags & SS_FACCEPTONCE)
 577            so->so_tcpcb->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT*2;
 578
 579         so->so_state = (SS_FACCEPTCONN|flags);
 580         so->so_lport = lport; /* Kept in network format */
 581         so->so_laddr.s_addr = laddr; /* Ditto */
 582
 583         addr.sin_family = AF_INET;
 584         addr.sin_addr.s_addr = INADDR_ANY;
 585         addr.sin_port = port;
 586
 587         if (((s = socket(AF_INET,SOCK_STREAM,0)) < 0) ||
 588             (setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)) < 0) ||
 589             (bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0) ||
 590             (listen(s,1) < 0)) {
 591                 int tmperrno = errno; /* Don't clobber the real reason we failed */
 592
 593                 close(s);
 594                 sofree(so);
 595                 /* Restore the real errno */
 596 #ifdef _WIN32
 597                 WSASetLastError(tmperrno);
 598 #else
 599                 errno = tmperrno;
 600 #endif
 601                 return NULL;
 602         }
 603         setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
 604
 605         getsockname(s,(struct sockaddr *)&addr,&addrlen);
 606         so->so_fport = addr.sin_port;
 607         if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr)
 608            so->so_faddr = alias_addr;
 609         else
 610            so->so_faddr = addr.sin_addr;
 611
 612         so->s = s;
 613         return so;
 614 }
 615
 616 #if 0
 617 /*
 618  * Data is available in so_rcv
 619  * Just write() the data to the socket
 620  * XXX not yet...
 621  */
 622 static void
 623 sorwakeup(so)
 624         struct socket *so;
 625 {
 626 /*      sowrite(so); */
 627 /*      FD_CLR(so->s,&writefds); */
 628 }
 629
 630 /*
 631  * Data has been freed in so_snd
 632  * We have room for a read() if we want to
 633  * For now, don't read, it'll be done in the main loop
 634  */
 635 static void
 636 sowwakeup(so)
 637         struct socket *so;
 638 {
 639         /* Nothing, yet */
 640 }
 641 #endif
 642
 643 /*
 644  * Various session state calls
 645  * XXX Should be #define's
 646  * The socket state stuff needs work, these often get call 2 or 3
 647  * times each when only 1 was needed
 648  */
 649 void
 650 soisfconnecting(so)
 651         register struct socket *so;
 652 {
 653         so->so_state &= ~(SS_NOFDREF|SS_ISFCONNECTED|SS_FCANTRCVMORE|
 654                           SS_FCANTSENDMORE|SS_FWDRAIN);
 655         so->so_state |= SS_ISFCONNECTING; /* Clobber other states */
 656 }
 657
 658 void
 659 soisfconnected(so)
 660         register struct socket *so;
 661 {
 662         so->so_state &= ~(SS_ISFCONNECTING|SS_FWDRAIN|SS_NOFDREF);
 663         so->so_state |= SS_ISFCONNECTED; /* Clobber other states */
 664 }
 665
 666 static void
 667 sofcantrcvmore(struct socket *so)
 668 {
 669         if ((so->so_state & SS_NOFDREF) == 0) {
 670                 shutdown(so->s,0);
 671                 if(global_writefds) {
 672                   FD_CLR(so->s,global_writefds);
 673                 }
 674         }
 675         so->so_state &= ~(SS_ISFCONNECTING);
 676         if (so->so_state & SS_FCANTSENDMORE)
 677            so->so_state = SS_NOFDREF; /* Don't select it */ /* XXX close() here as well? */
 678         else
 679            so->so_state |= SS_FCANTRCVMORE;
 680 }
 681
 682 static void
 683 sofcantsendmore(struct socket *so)
 684 {
 685         if ((so->so_state & SS_NOFDREF) == 0) {
 686             shutdown(so->s,1);           /* send FIN to fhost */
 687             if (global_readfds) {
 688                 FD_CLR(so->s,global_readfds);
 689             }
 690             if (global_xfds) {
 691                 FD_CLR(so->s,global_xfds);
 692             }
 693         }
 694         so->so_state &= ~(SS_ISFCONNECTING);
 695         if (so->so_state & SS_FCANTRCVMORE)
 696            so->so_state = SS_NOFDREF; /* as above */
 697         else
 698            so->so_state |= SS_FCANTSENDMORE;
 699 }
 700
 701 void
 702 soisfdisconnected(so)
 703         struct socket *so;
 704 {
 705 /*      so->so_state &= ~(SS_ISFCONNECTING|SS_ISFCONNECTED); */
 706 /*      close(so->s); */
 707 /*      so->so_state = SS_ISFDISCONNECTED; */
 708         /*
 709          * XXX Do nothing ... ?
 710          */
 711 }
 712
 713 /*
 714  * Set write drain mode
 715  * Set CANTSENDMORE once all data has been write()n
 716  */
 717 void
 718 sofwdrain(so)
 719         struct socket *so;
 720 {
 721         if (so->so_rcv.sb_cc)
 722                 so->so_state |= SS_FWDRAIN;
 723         else
 724                 sofcantsendmore(so);
 725 }