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
  15 static void sofcantrcvmore(struct socket *so);
  16 static void sofcantsendmore(struct socket *so);
  17
  18 #if 0
  19 static void
  20 so_init()
  21 {
  22         /* Nothing yet */
  23 }
  24 #endif
  25
  26 struct socket *
  27 solookup(head, laddr, lport, faddr, fport)
  28         struct socket *head;
  29         struct in_addr laddr;
  30         u_int lport;
  31         struct in_addr faddr;
  32         u_int fport;
  33 {
  34         struct socket *so;
  35
  36         for (so = head->so_next; so != head; so = so->so_next) {
  37                 if (so->so_lport == lport &&
  38                     so->so_laddr.s_addr == laddr.s_addr &&
  39                     so->so_faddr.s_addr == faddr.s_addr &&
  40                     so->so_fport == fport)
  41                    break;
  42         }
  43
  44         if (so == head)
  45            return (struct socket *)NULL;
  46         return so;
  47
  48 }
  49
  50 /*
  51  * Create a new socket, initialise the fields
  52  * It is the responsibility of the caller to
  53  * insque() it into the correct linked-list
  54  */
  55 struct socket *
  56 socreate()
  57 {
  58   struct socket *so;
  59
  60   so = (struct socket *)malloc(sizeof(struct socket));
  61   if(so) {
  62     memset(so, 0, sizeof(struct socket));
  63     so->so_state = SS_NOFDREF;
  64     so->s = -1;
  65   }
  66   return(so);
  67 }
  68
  69 /*
  70  * remque and free a socket, clobber cache
  71  */
  72 void
  73 sofree(so)
  74         struct socket *so;
  75 {
  76   if (so->so_emu==EMU_RSH && so->extra) {
  77         sofree(so->extra);
  78         so->extra=NULL;
  79   }
  80   if (so == tcp_last_so)
  81     tcp_last_so = &tcb;
  82   else if (so == udp_last_so)
  83     udp_last_so = &udb;
  84
  85   m_free(so->so_m);
  86
  87   if(so->so_next && so->so_prev)
  88     remque(so);  /* crashes if so is not in a queue */
  89
  90   free(so);
  91 }
  92
  93 /*
  94  * Read from so's socket into sb_snd, updating all relevant sbuf fields
  95  * NOTE: This will only be called if it is select()ed for reading, so
  96  * a read() of 0 (or less) means it's disconnected
  97  */
  98 int
  99 soread(so)
 100         struct socket *so;
 101 {
 102         int n, nn, lss, total;
 103         struct sbuf *sb = &so->so_snd;
 104         int len = sb->sb_datalen - sb->sb_cc;
 105         struct iovec iov[2];
 106         int mss = so->so_tcpcb->t_maxseg;
 107
 108         DEBUG_CALL("soread");
 109         DEBUG_ARG("so = %lx", (long )so);
 110
 111         /*
 112          * No need to check if there's enough room to read.
 113          * soread wouldn't have been called if there weren't
 114          */
 115
 116         len = sb->sb_datalen - sb->sb_cc;
 117
 118         iov[0].iov_base = sb->sb_wptr;
 119         if (sb->sb_wptr < sb->sb_rptr) {
 120                 iov[0].iov_len = sb->sb_rptr - sb->sb_wptr;
 121                 /* Should never succeed, but... */
 122                 if (iov[0].iov_len > len)
 123                    iov[0].iov_len = len;
 124                 if (iov[0].iov_len > mss)
 125                    iov[0].iov_len -= iov[0].iov_len%mss;
 126                 n = 1;
 127         } else {
 128                 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_wptr;
 129                 /* Should never succeed, but... */
 130                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 131                 len -= iov[0].iov_len;
 132                 if (len) {
 133                         iov[1].iov_base = sb->sb_data;
 134                         iov[1].iov_len = sb->sb_rptr - sb->sb_data;
 135                         if(iov[1].iov_len > len)
 136                            iov[1].iov_len = len;
 137                         total = iov[0].iov_len + iov[1].iov_len;
 138                         if (total > mss) {
 139                                 lss = total%mss;
 140                                 if (iov[1].iov_len > lss) {
 141                                         iov[1].iov_len -= lss;
 142                                         n = 2;
 143                                 } else {
 144                                         lss -= iov[1].iov_len;
 145                                         iov[0].iov_len -= lss;
 146                                         n = 1;
 147                                 }
 148                         } else
 149                                 n = 2;
 150                 } else {
 151                         if (iov[0].iov_len > mss)
 152                            iov[0].iov_len -= iov[0].iov_len%mss;
 153                         n = 1;
 154                 }
 155         }
 156
 157 #ifdef HAVE_READV
 158         nn = readv(so->s, (struct iovec *)iov, n);
 159         DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
 160 #else
 161         nn = recv(so->s, iov[0].iov_base, iov[0].iov_len,0);
 162 #endif
 163         if (nn <= 0) {
 164                 if (nn < 0 && (errno == EINTR || errno == EAGAIN))
 165                         return 0;
 166                 else {
 167                         DEBUG_MISC((dfd, " --- soread() disconnected, nn = %d, errno = %d-%s\n", nn, errno,strerror(errno)));
 168                         sofcantrcvmore(so);
 169                         tcp_sockclosed(sototcpcb(so));
 170                         return -1;
 171                 }
 172         }
 173
 174 #ifndef HAVE_READV
 175         /*
 176          * If there was no error, try and read the second time round
 177          * We read again if n = 2 (ie, there's another part of the buffer)
 178          * and we read as much as we could in the first read
 179          * We don't test for <= 0 this time, because there legitimately
 180          * might not be any more data (since the socket is non-blocking),
 181          * a close will be detected on next iteration.
 182          * A return of -1 wont (shouldn't) happen, since it didn't happen above
 183          */
 184         if (n == 2 && nn == iov[0].iov_len) {
 185             int ret;
 186             ret = recv(so->s, iov[1].iov_base, iov[1].iov_len,0);
 187             if (ret > 0)
 188                 nn += ret;
 189         }
 190
 191         DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
 192 #endif
 193
 194         /* Update fields */
 195         sb->sb_cc += nn;
 196         sb->sb_wptr += nn;
 197         if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
 198                 sb->sb_wptr -= sb->sb_datalen;
 199         return nn;
 200 }
 201
 202 /*
 203  * Get urgent data
 204  *
 205  * When the socket is created, we set it SO_OOBINLINE,
 206  * so when OOB data arrives, we soread() it and everything
 207  * in the send buffer is sent as urgent data
 208  */
 209 void
 210 sorecvoob(so)
 211         struct socket *so;
 212 {
 213         struct tcpcb *tp = sototcpcb(so);
 214
 215         DEBUG_CALL("sorecvoob");
 216         DEBUG_ARG("so = %lx", (long)so);
 217
 218         /*
 219          * We take a guess at how much urgent data has arrived.
 220          * In most situations, when urgent data arrives, the next
 221          * read() should get all the urgent data.  This guess will
 222          * be wrong however if more data arrives just after the
 223          * urgent data, or the read() doesn't return all the
 224          * urgent data.
 225          */
 226         soread(so);
 227         tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
 228         tp->t_force = 1;
 229         tcp_output(tp);
 230         tp->t_force = 0;
 231 }
 232
 233 /*
 234  * Send urgent data
 235  * There's a lot duplicated code here, but...
 236  */
 237 int
 238 sosendoob(so)
 239         struct socket *so;
 240 {
 241         struct sbuf *sb = &so->so_rcv;
 242         char buff[2048]; /* XXX Shouldn't be sending more oob data than this */
 243
 244         int n, len;
 245
 246         DEBUG_CALL("sosendoob");
 247         DEBUG_ARG("so = %lx", (long)so);
 248         DEBUG_ARG("sb->sb_cc = %d", sb->sb_cc);
 249
 250         if (so->so_urgc > 2048)
 251            so->so_urgc = 2048; /* XXXX */
 252
 253         if (sb->sb_rptr < sb->sb_wptr) {
 254                 /* We can send it directly */
 255                 n = send(so->s, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */
 256                 so->so_urgc -= n;
 257
 258                 DEBUG_MISC((dfd, " --- sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
 259         } else {
 260                 /*
 261                  * Since there's no sendv or sendtov like writev,
 262                  * we must copy all data to a linear buffer then
 263                  * send it all
 264                  */
 265                 len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
 266                 if (len > so->so_urgc) len = so->so_urgc;
 267                 memcpy(buff, sb->sb_rptr, len);
 268                 so->so_urgc -= len;
 269                 if (so->so_urgc) {
 270                         n = sb->sb_wptr - sb->sb_data;
 271                         if (n > so->so_urgc) n = so->so_urgc;
 272                         memcpy((buff + len), sb->sb_data, n);
 273                         so->so_urgc -= n;
 274                         len += n;
 275                 }
 276                 n = send(so->s, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */
 277 #ifdef DEBUG
 278                 if (n != len)
 279                    DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n"));
 280 #endif
 281                 DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
 282         }
 283
 284         sb->sb_cc -= n;
 285         sb->sb_rptr += n;
 286         if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
 287                 sb->sb_rptr -= sb->sb_datalen;
 288
 289         return n;
 290 }
 291
 292 /*
 293  * Write data from so_rcv to so's socket,
 294  * updating all sbuf field as necessary
 295  */
 296 int
 297 sowrite(so)
 298         struct socket *so;
 299 {
 300         int  n,nn;
 301         struct sbuf *sb = &so->so_rcv;
 302         int len = sb->sb_cc;
 303         struct iovec iov[2];
 304
 305         DEBUG_CALL("sowrite");
 306         DEBUG_ARG("so = %lx", (long)so);
 307
 308         if (so->so_urgc) {
 309                 sosendoob(so);
 310                 if (sb->sb_cc == 0)
 311                         return 0;
 312         }
 313
 314         /*
 315          * No need to check if there's something to write,
 316          * sowrite wouldn't have been called otherwise
 317          */
 318
 319         len = sb->sb_cc;
 320
 321         iov[0].iov_base = sb->sb_rptr;
 322         if (sb->sb_rptr < sb->sb_wptr) {
 323                 iov[0].iov_len = sb->sb_wptr - sb->sb_rptr;
 324                 /* Should never succeed, but... */
 325                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 326                 n = 1;
 327         } else {
 328                 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
 329                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 330                 len -= iov[0].iov_len;
 331                 if (len) {
 332                         iov[1].iov_base = sb->sb_data;
 333                         iov[1].iov_len = sb->sb_wptr - sb->sb_data;
 334                         if (iov[1].iov_len > len) iov[1].iov_len = len;
 335                         n = 2;
 336                 } else
 337                         n = 1;
 338         }
 339         /* Check if there's urgent data to send, and if so, send it */
 340
 341 #ifdef HAVE_READV
 342         nn = writev(so->s, (const struct iovec *)iov, n);
 343
 344         DEBUG_MISC((dfd, "  ... wrote nn = %d bytes\n", nn));
 345 #else
 346         nn = send(so->s, iov[0].iov_base, iov[0].iov_len,0);
 347 #endif
 348         /* This should never happen, but people tell me it does *shrug* */
 349         if (nn < 0 && (errno == EAGAIN || errno == EINTR))
 350                 return 0;
 351
 352         if (nn <= 0) {
 353                 DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n",
 354                         so->so_state, errno));
 355                 sofcantsendmore(so);
 356                 tcp_sockclosed(sototcpcb(so));
 357                 return -1;
 358         }
 359
 360 #ifndef HAVE_READV
 361         if (n == 2 && nn == iov[0].iov_len) {
 362             int ret;
 363             ret = send(so->s, iov[1].iov_base, iov[1].iov_len,0);
 364             if (ret > 0)
 365                 nn += ret;
 366         }
 367         DEBUG_MISC((dfd, "  ... wrote nn = %d bytes\n", nn));
 368 #endif
 369
 370         /* Update sbuf */
 371         sb->sb_cc -= nn;
 372         sb->sb_rptr += nn;
 373         if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
 374                 sb->sb_rptr -= sb->sb_datalen;
 375
 376         /*
 377          * If in DRAIN mode, and there's no more data, set
 378          * it CANTSENDMORE
 379          */
 380         if ((so->so_state & SS_FWDRAIN) && sb->sb_cc == 0)
 381                 sofcantsendmore(so);
 382
 383         return nn;
 384 }
 385
 386 /*
 387  * recvfrom() a UDP socket
 388  */
 389 void
 390 sorecvfrom(so)
 391         struct socket *so;
 392 {
 393         struct sockaddr_in addr;
 394         socklen_t addrlen = sizeof(struct sockaddr_in);
 395
 396         DEBUG_CALL("sorecvfrom");
 397         DEBUG_ARG("so = %lx", (long)so);
 398
 399         if (so->so_type == IPPROTO_ICMP) {   /* This is a "ping" reply */
 400           char buff[256];
 401           int len;
 402
 403           len = recvfrom(so->s, buff, 256, 0,
 404                          (struct sockaddr *)&addr, &addrlen);
 405           /* XXX Check if reply is "correct"? */
 406
 407           if(len == -1 || len == 0) {
 408             u_char code=ICMP_UNREACH_PORT;
 409
 410             if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
 411             else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
 412
 413             DEBUG_MISC((dfd," udp icmp rx errno = %d-%s\n",
 414                         errno,strerror(errno)));
 415             icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
 416           } else {
 417             icmp_reflect(so->so_m);
 418             so->so_m = 0; /* Don't m_free() it again! */
 419           }
 420           /* No need for this socket anymore, udp_detach it */
 421           udp_detach(so);
 422         } else {                                /* A "normal" UDP packet */
 423           struct mbuf *m;
 424           int len, n;
 425
 426           if (!(m = m_get())) return;
 427           m->m_data += IF_MAXLINKHDR;
 428
 429           /*
 430            * XXX Shouldn't FIONREAD packets destined for port 53,
 431            * but I don't know the max packet size for DNS lookups
 432            */
 433           len = M_FREEROOM(m);
 434           /* if (so->so_fport != htons(53)) { */
 435           ioctlsocket(so->s, FIONREAD, &n);
 436
 437           if (n > len) {
 438             n = (m->m_data - m->m_dat) + m->m_len + n + 1;
 439             m_inc(m, n);
 440             len = M_FREEROOM(m);
 441           }
 442           /* } */
 443
 444           m->m_len = recvfrom(so->s, m->m_data, len, 0,
 445                               (struct sockaddr *)&addr, &addrlen);
 446           DEBUG_MISC((dfd, " did recvfrom %d, errno = %d-%s\n",
 447                       m->m_len, errno,strerror(errno)));
 448           if(m->m_len<0) {
 449             u_char code=ICMP_UNREACH_PORT;
 450
 451             if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
 452             else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
 453
 454             DEBUG_MISC((dfd," rx error, tx icmp ICMP_UNREACH:%i\n", code));
 455             icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
 456             m_free(m);
 457           } else {
 458           /*
 459            * Hack: domain name lookup will be used the most for UDP,
 460            * and since they'll only be used once there's no need
 461            * for the 4 minute (or whatever) timeout... So we time them
 462            * out much quicker (10 seconds  for now...)
 463            */
 464             if (so->so_expire) {
 465               if (so->so_fport == htons(53))
 466                 so->so_expire = curtime + SO_EXPIREFAST;
 467               else
 468                 so->so_expire = curtime + SO_EXPIRE;
 469             }
 470
 471             /*          if (m->m_len == len) {
 472              *                  m_inc(m, MINCSIZE);
 473              *                  m->m_len = 0;
 474              *          }
 475              */
 476
 477             /*
 478              * If this packet was destined for CTL_ADDR,
 479              * make it look like that's where it came from, done by udp_output
 480              */
 481             udp_output(so, m, &addr);
 482           } /* rx error */
 483         } /* if ping packet */
 484 }
 485
 486 /*
 487  * sendto() a socket
 488  */
 489 int
 490 sosendto(so, m)
 491         struct socket *so;
 492         struct mbuf *m;
 493 {
 494         int ret;
 495         struct sockaddr_in addr;
 496
 497         DEBUG_CALL("sosendto");
 498         DEBUG_ARG("so = %lx", (long)so);
 499         DEBUG_ARG("m = %lx", (long)m);
 500
 501         addr.sin_family = AF_INET;
 502         if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
 503           /* It's an alias */
 504           switch(ntohl(so->so_faddr.s_addr) & 0xff) {
 505           case CTL_DNS:
 506             addr.sin_addr = dns_addr;
 507             break;
 508           case CTL_ALIAS:
 509           default:
 510             addr.sin_addr = loopback_addr;
 511             break;
 512           }
 513         } else
 514           addr.sin_addr = so->so_faddr;
 515         addr.sin_port = so->so_fport;
 516
 517         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)));
 518
 519         /* Don't care what port we get */
 520         ret = sendto(so->s, m->m_data, m->m_len, 0,
 521                      (struct sockaddr *)&addr, sizeof (struct sockaddr));
 522         if (ret < 0)
 523                 return -1;
 524
 525         /*
 526          * Kill the socket if there's no reply in 4 minutes,
 527          * but only if it's an expirable socket
 528          */
 529         if (so->so_expire)
 530                 so->so_expire = curtime + SO_EXPIRE;
 531         so->so_state = SS_ISFCONNECTED; /* So that it gets select()ed */
 532         return 0;
 533 }
 534
 535 /*
 536  * XXX This should really be tcp_listen
 537  */
 538 struct socket *
 539 solisten(port, laddr, lport, flags)
 540         u_int port;
 541         u_int32_t laddr;
 542         u_int lport;
 543         int flags;
 544 {
 545         struct sockaddr_in addr;
 546         struct socket *so;
 547         int s, opt = 1;
 548         socklen_t addrlen = sizeof(addr);
 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