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 #include "qemu-common.h"
   9 #define WANT_SYS_IOCTL_H
  10 #include <slirp.h>
  11 #include "ip_icmp.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(struct socket *head, struct in_addr laddr, u_int lport,
  29          struct in_addr faddr, u_int fport)
  30 {
  31         struct socket *so;
  32
  33         for (so = head->so_next; so != head; so = so->so_next) {
  34                 if (so->so_lport == lport &&
  35                     so->so_laddr.s_addr == laddr.s_addr &&
  36                     so->so_faddr.s_addr == faddr.s_addr &&
  37                     so->so_fport == fport)
  38                    break;
  39         }
  40
  41         if (so == head)
  42            return (struct socket *)NULL;
  43         return so;
  44
  45 }
  46
  47 /*
  48  * Create a new socket, initialise the fields
  49  * It is the responsibility of the caller to
  50  * insque() it into the correct linked-list
  51  */
  52 struct socket *
  53 socreate(void)
  54 {
  55   struct socket *so;
  56
  57   so = (struct socket *)malloc(sizeof(struct socket));
  58   if(so) {
  59     memset(so, 0, sizeof(struct socket));
  60     so->so_state = SS_NOFDREF;
  61     so->s = -1;
  62   }
  63   return(so);
  64 }
  65
  66 /*
  67  * remque and free a socket, clobber cache
  68  */
  69 void
  70 sofree(struct socket *so)
  71 {
  72   if (so->so_emu==EMU_RSH && so->extra) {
  73         sofree(so->extra);
  74         so->extra=NULL;
  75   }
  76   if (so == tcp_last_so)
  77     tcp_last_so = &tcb;
  78   else if (so == udp_last_so)
  79     udp_last_so = &udb;
  80
  81   m_free(so->so_m);
  82
  83   if(so->so_next && so->so_prev)
  84     remque(so);  /* crashes if so is not in a queue */
  85
  86   free(so);
  87 }
  88
  89 size_t sopreprbuf(struct socket *so, struct iovec *iov, int *np)
  90 {
  91         int n, lss, total;
  92         struct sbuf *sb = &so->so_snd;
  93         int len = sb->sb_datalen - sb->sb_cc;
  94         int mss = so->so_tcpcb->t_maxseg;
  95
  96         DEBUG_CALL("sopreprbuf");
  97         DEBUG_ARG("so = %lx", (long )so);
  98
  99         len = sb->sb_datalen - sb->sb_cc;
 100
 101         if (len <= 0)
 102                 return 0;
 103
 104         iov[0].iov_base = sb->sb_wptr;
 105         iov[1].iov_base = NULL;
 106         iov[1].iov_len = 0;
 107         if (sb->sb_wptr < sb->sb_rptr) {
 108                 iov[0].iov_len = sb->sb_rptr - sb->sb_wptr;
 109                 /* Should never succeed, but... */
 110                 if (iov[0].iov_len > len)
 111                    iov[0].iov_len = len;
 112                 if (iov[0].iov_len > mss)
 113                    iov[0].iov_len -= iov[0].iov_len%mss;
 114                 n = 1;
 115         } else {
 116                 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_wptr;
 117                 /* Should never succeed, but... */
 118                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 119                 len -= iov[0].iov_len;
 120                 if (len) {
 121                         iov[1].iov_base = sb->sb_data;
 122                         iov[1].iov_len = sb->sb_rptr - sb->sb_data;
 123                         if(iov[1].iov_len > len)
 124                            iov[1].iov_len = len;
 125                         total = iov[0].iov_len + iov[1].iov_len;
 126                         if (total > mss) {
 127                                 lss = total%mss;
 128                                 if (iov[1].iov_len > lss) {
 129                                         iov[1].iov_len -= lss;
 130                                         n = 2;
 131                                 } else {
 132                                         lss -= iov[1].iov_len;
 133                                         iov[0].iov_len -= lss;
 134                                         n = 1;
 135                                 }
 136                         } else
 137                                 n = 2;
 138                 } else {
 139                         if (iov[0].iov_len > mss)
 140                            iov[0].iov_len -= iov[0].iov_len%mss;
 141                         n = 1;
 142                 }
 143         }
 144         if (np)
 145                 *np = n;
 146
 147         return iov[0].iov_len + (n - 1) * iov[1].iov_len;
 148 }
 149
 150 /*
 151  * Read from so's socket into sb_snd, updating all relevant sbuf fields
 152  * NOTE: This will only be called if it is select()ed for reading, so
 153  * a read() of 0 (or less) means it's disconnected
 154  */
 155 int
 156 soread(struct socket *so)
 157 {
 158         int n, nn;
 159         struct sbuf *sb = &so->so_snd;
 160         struct iovec iov[2];
 161
 162         DEBUG_CALL("soread");
 163         DEBUG_ARG("so = %lx", (long )so);
 164
 165         /*
 166          * No need to check if there's enough room to read.
 167          * soread wouldn't have been called if there weren't
 168          */
 169         sopreprbuf(so, iov, &n);
 170
 171 #ifdef HAVE_READV
 172         nn = readv(so->s, (struct iovec *)iov, n);
 173         DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
 174 #else
 175         nn = recv(so->s, iov[0].iov_base, iov[0].iov_len,0);
 176 #endif
 177         if (nn <= 0) {
 178                 if (nn < 0 && (errno == EINTR || errno == EAGAIN))
 179                         return 0;
 180                 else {
 181                         DEBUG_MISC((dfd, " --- soread() disconnected, nn = %d, errno = %d-%s\n", nn, errno,strerror(errno)));
 182                         sofcantrcvmore(so);
 183                         tcp_sockclosed(sototcpcb(so));
 184                         return -1;
 185                 }
 186         }
 187
 188 #ifndef HAVE_READV
 189         /*
 190          * If there was no error, try and read the second time round
 191          * We read again if n = 2 (ie, there's another part of the buffer)
 192          * and we read as much as we could in the first read
 193          * We don't test for <= 0 this time, because there legitimately
 194          * might not be any more data (since the socket is non-blocking),
 195          * a close will be detected on next iteration.
 196          * A return of -1 wont (shouldn't) happen, since it didn't happen above
 197          */
 198         if (n == 2 && nn == iov[0].iov_len) {
 199             int ret;
 200             ret = recv(so->s, iov[1].iov_base, iov[1].iov_len,0);
 201             if (ret > 0)
 202                 nn += ret;
 203         }
 204
 205         DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
 206 #endif
 207
 208         /* Update fields */
 209         sb->sb_cc += nn;
 210         sb->sb_wptr += nn;
 211         if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
 212                 sb->sb_wptr -= sb->sb_datalen;
 213         return nn;
 214 }
 215
 216 int soreadbuf(struct socket *so, const char *buf, int size)
 217 {
 218     int n, nn, copy = size;
 219         struct sbuf *sb = &so->so_snd;
 220         struct iovec iov[2];
 221
 222         DEBUG_CALL("soreadbuf");
 223         DEBUG_ARG("so = %lx", (long )so);
 224
 225         /*
 226          * No need to check if there's enough room to read.
 227          * soread wouldn't have been called if there weren't
 228          */
 229         if (sopreprbuf(so, iov, &n) < size)
 230         goto err;
 231
 232     nn = MIN(iov[0].iov_len, copy);
 233     memcpy(iov[0].iov_base, buf, nn);
 234
 235     copy -= nn;
 236     buf += nn;
 237
 238     if (copy == 0)
 239         goto done;
 240
 241     memcpy(iov[1].iov_base, buf, copy);
 242
 243 done:
 244     /* Update fields */
 245         sb->sb_cc += size;
 246         sb->sb_wptr += size;
 247         if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
 248                 sb->sb_wptr -= sb->sb_datalen;
 249     return size;
 250 err:
 251
 252     sofcantrcvmore(so);
 253     tcp_sockclosed(sototcpcb(so));
 254     fprintf(stderr, "soreadbuf buffer to small");
 255     return -1;
 256 }
 257
 258 /*
 259  * Get urgent data
 260  *
 261  * When the socket is created, we set it SO_OOBINLINE,
 262  * so when OOB data arrives, we soread() it and everything
 263  * in the send buffer is sent as urgent data
 264  */
 265 void
 266 sorecvoob(struct socket *so)
 267 {
 268         struct tcpcb *tp = sototcpcb(so);
 269
 270         DEBUG_CALL("sorecvoob");
 271         DEBUG_ARG("so = %lx", (long)so);
 272
 273         /*
 274          * We take a guess at how much urgent data has arrived.
 275          * In most situations, when urgent data arrives, the next
 276          * read() should get all the urgent data.  This guess will
 277          * be wrong however if more data arrives just after the
 278          * urgent data, or the read() doesn't return all the
 279          * urgent data.
 280          */
 281         soread(so);
 282         tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
 283         tp->t_force = 1;
 284         tcp_output(tp);
 285         tp->t_force = 0;
 286 }
 287
 288 /*
 289  * Send urgent data
 290  * There's a lot duplicated code here, but...
 291  */
 292 int
 293 sosendoob(struct socket *so)
 294 {
 295         struct sbuf *sb = &so->so_rcv;
 296         char buff[2048]; /* XXX Shouldn't be sending more oob data than this */
 297
 298         int n, len;
 299
 300         DEBUG_CALL("sosendoob");
 301         DEBUG_ARG("so = %lx", (long)so);
 302         DEBUG_ARG("sb->sb_cc = %d", sb->sb_cc);
 303
 304         if (so->so_urgc > 2048)
 305            so->so_urgc = 2048; /* XXXX */
 306
 307         if (sb->sb_rptr < sb->sb_wptr) {
 308                 /* We can send it directly */
 309                 n = slirp_send(so, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */
 310                 so->so_urgc -= n;
 311
 312                 DEBUG_MISC((dfd, " --- sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
 313         } else {
 314                 /*
 315                  * Since there's no sendv or sendtov like writev,
 316                  * we must copy all data to a linear buffer then
 317                  * send it all
 318                  */
 319                 len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
 320                 if (len > so->so_urgc) len = so->so_urgc;
 321                 memcpy(buff, sb->sb_rptr, len);
 322                 so->so_urgc -= len;
 323                 if (so->so_urgc) {
 324                         n = sb->sb_wptr - sb->sb_data;
 325                         if (n > so->so_urgc) n = so->so_urgc;
 326                         memcpy((buff + len), sb->sb_data, n);
 327                         so->so_urgc -= n;
 328                         len += n;
 329                 }
 330                 n = slirp_send(so, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */
 331 #ifdef DEBUG
 332                 if (n != len)
 333                    DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n"));
 334 #endif
 335                 DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
 336         }
 337
 338         sb->sb_cc -= n;
 339         sb->sb_rptr += n;
 340         if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
 341                 sb->sb_rptr -= sb->sb_datalen;
 342
 343         return n;
 344 }
 345
 346 /*
 347  * Write data from so_rcv to so's socket,
 348  * updating all sbuf field as necessary
 349  */
 350 int
 351 sowrite(struct socket *so)
 352 {
 353         int  n,nn;
 354         struct sbuf *sb = &so->so_rcv;
 355         int len = sb->sb_cc;
 356         struct iovec iov[2];
 357
 358         DEBUG_CALL("sowrite");
 359         DEBUG_ARG("so = %lx", (long)so);
 360
 361         if (so->so_urgc) {
 362                 sosendoob(so);
 363                 if (sb->sb_cc == 0)
 364                         return 0;
 365         }
 366
 367         /*
 368          * No need to check if there's something to write,
 369          * sowrite wouldn't have been called otherwise
 370          */
 371
 372         len = sb->sb_cc;
 373
 374         iov[0].iov_base = sb->sb_rptr;
 375         iov[1].iov_base = NULL;
 376         iov[1].iov_len = 0;
 377         if (sb->sb_rptr < sb->sb_wptr) {
 378                 iov[0].iov_len = sb->sb_wptr - sb->sb_rptr;
 379                 /* Should never succeed, but... */
 380                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 381                 n = 1;
 382         } else {
 383                 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
 384                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 385                 len -= iov[0].iov_len;
 386                 if (len) {
 387                         iov[1].iov_base = sb->sb_data;
 388                         iov[1].iov_len = sb->sb_wptr - sb->sb_data;
 389                         if (iov[1].iov_len > len) iov[1].iov_len = len;
 390                         n = 2;
 391                 } else
 392                         n = 1;
 393         }
 394         /* Check if there's urgent data to send, and if so, send it */
 395
 396 #ifdef HAVE_READV
 397         nn = writev(so->s, (const struct iovec *)iov, n);
 398
 399         DEBUG_MISC((dfd, "  ... wrote nn = %d bytes\n", nn));
 400 #else
 401         nn = slirp_send(so, iov[0].iov_base, iov[0].iov_len,0);
 402 #endif
 403         /* This should never happen, but people tell me it does *shrug* */
 404         if (nn < 0 && (errno == EAGAIN || errno == EINTR))
 405                 return 0;
 406
 407         if (nn <= 0) {
 408                 DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n",
 409                         so->so_state, errno));
 410                 sofcantsendmore(so);
 411                 tcp_sockclosed(sototcpcb(so));
 412                 return -1;
 413         }
 414
 415 #ifndef HAVE_READV
 416         if (n == 2 && nn == iov[0].iov_len) {
 417             int ret;
 418             ret = slirp_send(so, iov[1].iov_base, iov[1].iov_len,0);
 419             if (ret > 0)
 420                 nn += ret;
 421         }
 422         DEBUG_MISC((dfd, "  ... wrote nn = %d bytes\n", nn));
 423 #endif
 424
 425         /* Update sbuf */
 426         sb->sb_cc -= nn;
 427         sb->sb_rptr += nn;
 428         if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
 429                 sb->sb_rptr -= sb->sb_datalen;
 430
 431         /*
 432          * If in DRAIN mode, and there's no more data, set
 433          * it CANTSENDMORE
 434          */
 435         if ((so->so_state & SS_FWDRAIN) && sb->sb_cc == 0)
 436                 sofcantsendmore(so);
 437
 438         return nn;
 439 }
 440
 441 /*
 442  * recvfrom() a UDP socket
 443  */
 444 void
 445 sorecvfrom(struct socket *so)
 446 {
 447         struct sockaddr_in addr;
 448         socklen_t addrlen = sizeof(struct sockaddr_in);
 449
 450         DEBUG_CALL("sorecvfrom");
 451         DEBUG_ARG("so = %lx", (long)so);
 452
 453         if (so->so_type == IPPROTO_ICMP) {   /* This is a "ping" reply */
 454           char buff[256];
 455           int len;
 456
 457           len = recvfrom(so->s, buff, 256, 0,
 458                          (struct sockaddr *)&addr, &addrlen);
 459           /* XXX Check if reply is "correct"? */
 460
 461           if(len == -1 || len == 0) {
 462             u_char code=ICMP_UNREACH_PORT;
 463
 464             if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
 465             else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
 466
 467             DEBUG_MISC((dfd," udp icmp rx errno = %d-%s\n",
 468                         errno,strerror(errno)));
 469             icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
 470           } else {
 471             icmp_reflect(so->so_m);
 472             so->so_m = NULL; /* Don't m_free() it again! */
 473           }
 474           /* No need for this socket anymore, udp_detach it */
 475           udp_detach(so);
 476         } else {                                /* A "normal" UDP packet */
 477           struct mbuf *m;
 478           int len, n;
 479
 480           if (!(m = m_get())) return;
 481           m->m_data += IF_MAXLINKHDR;
 482
 483           /*
 484            * XXX Shouldn't FIONREAD packets destined for port 53,
 485            * but I don't know the max packet size for DNS lookups
 486            */
 487           len = M_FREEROOM(m);
 488           /* if (so->so_fport != htons(53)) { */
 489           ioctlsocket(so->s, FIONREAD, &n);
 490
 491           if (n > len) {
 492             n = (m->m_data - m->m_dat) + m->m_len + n + 1;
 493             m_inc(m, n);
 494             len = M_FREEROOM(m);
 495           }
 496           /* } */
 497
 498           m->m_len = recvfrom(so->s, m->m_data, len, 0,
 499                               (struct sockaddr *)&addr, &addrlen);
 500           DEBUG_MISC((dfd, " did recvfrom %d, errno = %d-%s\n",
 501                       m->m_len, errno,strerror(errno)));
 502           if(m->m_len<0) {
 503             u_char code=ICMP_UNREACH_PORT;
 504
 505             if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
 506             else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
 507
 508             DEBUG_MISC((dfd," rx error, tx icmp ICMP_UNREACH:%i\n", code));
 509             icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
 510             m_free(m);
 511           } else {
 512           /*
 513            * Hack: domain name lookup will be used the most for UDP,
 514            * and since they'll only be used once there's no need
 515            * for the 4 minute (or whatever) timeout... So we time them
 516            * out much quicker (10 seconds  for now...)
 517            */
 518             if (so->so_expire) {
 519               if (so->so_fport == htons(53))
 520                 so->so_expire = curtime + SO_EXPIREFAST;
 521               else
 522                 so->so_expire = curtime + SO_EXPIRE;
 523             }
 524
 525             /*          if (m->m_len == len) {
 526              *                  m_inc(m, MINCSIZE);
 527              *                  m->m_len = 0;
 528              *          }
 529              */
 530
 531             /*
 532              * If this packet was destined for CTL_ADDR,
 533              * make it look like that's where it came from, done by udp_output
 534              */
 535             udp_output(so, m, &addr);
 536           } /* rx error */
 537         } /* if ping packet */
 538 }
 539
 540 /*
 541  * sendto() a socket
 542  */
 543 int
 544 sosendto(struct socket *so, struct mbuf *m)
 545 {
 546         int ret;
 547         struct sockaddr_in addr;
 548
 549         DEBUG_CALL("sosendto");
 550         DEBUG_ARG("so = %lx", (long)so);
 551         DEBUG_ARG("m = %lx", (long)m);
 552
 553         addr.sin_family = AF_INET;
 554         if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
 555           /* It's an alias */
 556           switch(ntohl(so->so_faddr.s_addr) & 0xff) {
 557           case CTL_DNS:
 558             addr.sin_addr = dns_addr;
 559             break;
 560           case CTL_ALIAS:
 561           default:
 562             addr.sin_addr = loopback_addr;
 563             break;
 564           }
 565         } else
 566           addr.sin_addr = so->so_faddr;
 567         addr.sin_port = so->so_fport;
 568
 569         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)));
 570
 571         /* Don't care what port we get */
 572         ret = sendto(so->s, m->m_data, m->m_len, 0,
 573                      (struct sockaddr *)&addr, sizeof (struct sockaddr));
 574         if (ret < 0)
 575                 return -1;
 576
 577         /*
 578          * Kill the socket if there's no reply in 4 minutes,
 579          * but only if it's an expirable socket
 580          */
 581         if (so->so_expire)
 582                 so->so_expire = curtime + SO_EXPIRE;
 583         so->so_state = SS_ISFCONNECTED; /* So that it gets select()ed */
 584         return 0;
 585 }
 586
 587 /*
 588  * XXX This should really be tcp_listen
 589  */
 590 struct socket *
 591 solisten(u_int port, u_int32_t laddr, u_int lport, int flags)
 592 {
 593         struct sockaddr_in addr;
 594         struct socket *so;
 595         int s, opt = 1;
 596         socklen_t addrlen = sizeof(addr);
 597
 598         DEBUG_CALL("solisten");
 599         DEBUG_ARG("port = %d", port);
 600         DEBUG_ARG("laddr = %x", laddr);
 601         DEBUG_ARG("lport = %d", lport);
 602         DEBUG_ARG("flags = %x", flags);
 603
 604         if ((so = socreate()) == NULL) {
 605           /* free(so);      Not sofree() ??? free(NULL) == NOP */
 606           return NULL;
 607         }
 608
 609         /* Don't tcp_attach... we don't need so_snd nor so_rcv */
 610         if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) {
 611                 free(so);
 612                 return NULL;
 613         }
 614         insque(so,&tcb);
 615
 616         /*
 617          * SS_FACCEPTONCE sockets must time out.
 618          */
 619         if (flags & SS_FACCEPTONCE)
 620            so->so_tcpcb->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT*2;
 621
 622         so->so_state = (SS_FACCEPTCONN|flags);
 623         so->so_lport = lport; /* Kept in network format */
 624         so->so_laddr.s_addr = laddr; /* Ditto */
 625
 626         addr.sin_family = AF_INET;
 627         addr.sin_addr.s_addr = INADDR_ANY;
 628         addr.sin_port = port;
 629
 630         if (((s = socket(AF_INET,SOCK_STREAM,0)) < 0) ||
 631             (setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)) < 0) ||
 632             (bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0) ||
 633             (listen(s,1) < 0)) {
 634                 int tmperrno = errno; /* Don't clobber the real reason we failed */
 635
 636                 close(s);
 637                 sofree(so);
 638                 /* Restore the real errno */
 639 #ifdef _WIN32
 640                 WSASetLastError(tmperrno);
 641 #else
 642                 errno = tmperrno;
 643 #endif
 644                 return NULL;
 645         }
 646         setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
 647
 648         getsockname(s,(struct sockaddr *)&addr,&addrlen);
 649         so->so_fport = addr.sin_port;
 650         if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr)
 651            so->so_faddr = alias_addr;
 652         else
 653            so->so_faddr = addr.sin_addr;
 654
 655         so->s = s;
 656         return so;
 657 }
 658
 659 #if 0
 660 /*
 661  * Data is available in so_rcv
 662  * Just write() the data to the socket
 663  * XXX not yet...
 664  */
 665 static void
 666 sorwakeup(so)
 667         struct socket *so;
 668 {
 669 /*      sowrite(so); */
 670 /*      FD_CLR(so->s,&writefds); */
 671 }
 672
 673 /*
 674  * Data has been freed in so_snd
 675  * We have room for a read() if we want to
 676  * For now, don't read, it'll be done in the main loop
 677  */
 678 static void
 679 sowwakeup(so)
 680         struct socket *so;
 681 {
 682         /* Nothing, yet */
 683 }
 684 #endif
 685
 686 /*
 687  * Various session state calls
 688  * XXX Should be #define's
 689  * The socket state stuff needs work, these often get call 2 or 3
 690  * times each when only 1 was needed
 691  */
 692 void
 693 soisfconnecting(struct socket *so)
 694 {
 695         so->so_state &= ~(SS_NOFDREF|SS_ISFCONNECTED|SS_FCANTRCVMORE|
 696                           SS_FCANTSENDMORE|SS_FWDRAIN);
 697         so->so_state |= SS_ISFCONNECTING; /* Clobber other states */
 698 }
 699
 700 void
 701 soisfconnected(struct socket *so)
 702 {
 703         so->so_state &= ~(SS_ISFCONNECTING|SS_FWDRAIN|SS_NOFDREF);
 704         so->so_state |= SS_ISFCONNECTED; /* Clobber other states */
 705 }
 706
 707 static void
 708 sofcantrcvmore(struct socket *so)
 709 {
 710         if ((so->so_state & SS_NOFDREF) == 0) {
 711                 shutdown(so->s,0);
 712                 if(global_writefds) {
 713                   FD_CLR(so->s,global_writefds);
 714                 }
 715         }
 716         so->so_state &= ~(SS_ISFCONNECTING);
 717         if (so->so_state & SS_FCANTSENDMORE)
 718            so->so_state = SS_NOFDREF; /* Don't select it */ /* XXX close() here as well? */
 719         else
 720            so->so_state |= SS_FCANTRCVMORE;
 721 }
 722
 723 static void
 724 sofcantsendmore(struct socket *so)
 725 {
 726         if ((so->so_state & SS_NOFDREF) == 0) {
 727             shutdown(so->s,1);           /* send FIN to fhost */
 728             if (global_readfds) {
 729                 FD_CLR(so->s,global_readfds);
 730             }
 731             if (global_xfds) {
 732                 FD_CLR(so->s,global_xfds);
 733             }
 734         }
 735         so->so_state &= ~(SS_ISFCONNECTING);
 736         if (so->so_state & SS_FCANTRCVMORE)
 737            so->so_state = SS_NOFDREF; /* as above */
 738         else
 739            so->so_state |= SS_FCANTSENDMORE;
 740 }
 741
 742 void
 743 soisfdisconnected(struct socket *so)
 744 {
 745 /*      so->so_state &= ~(SS_ISFCONNECTING|SS_ISFCONNECTED); */
 746 /*      close(so->s); */
 747 /*      so->so_state = SS_ISFDISCONNECTED; */
 748         /*
 749          * XXX Do nothing ... ?
 750          */
 751 }
 752
 753 /*
 754  * Set write drain mode
 755  * Set CANTSENDMORE once all data has been write()n
 756  */
 757 void
 758 sofwdrain(struct socket *so)
 759 {
 760         if (so->so_rcv.sb_cc)
 761                 so->so_state |= SS_FWDRAIN;
 762         else
 763                 sofcantsendmore(so);
 764 }