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