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 #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 struct socket *
  19 solookup(struct socket *head, struct in_addr laddr, u_int lport,
  20          struct in_addr faddr, u_int fport)
  21 {
  22         struct socket *so;
  23
  24         for (so = head->so_next; so != head; so = so->so_next) {
  25                 if (so->so_lport == lport &&
  26                     so->so_laddr.s_addr == laddr.s_addr &&
  27                     so->so_faddr.s_addr == faddr.s_addr &&
  28                     so->so_fport == fport)
  29                    break;
  30         }
  31
  32         if (so == head)
  33            return (struct socket *)NULL;
  34         return so;
  35
  36 }
  37
  38 /*
  39  * Create a new socket, initialise the fields
  40  * It is the responsibility of the caller to
  41  * insque() it into the correct linked-list
  42  */
  43 struct socket *
  44 socreate(Slirp *slirp)
  45 {
  46   struct socket *so;
  47
  48   so = (struct socket *)malloc(sizeof(struct socket));
  49   if(so) {
  50     memset(so, 0, sizeof(struct socket));
  51     so->so_state = SS_NOFDREF;
  52     so->s = -1;
  53     so->slirp = slirp;
  54   }
  55   return(so);
  56 }
  57
  58 /*
  59  * remque and free a socket, clobber cache
  60  */
  61 void
  62 sofree(struct socket *so)
  63 {
  64   Slirp *slirp = so->slirp;
  65
  66   if (so->so_emu==EMU_RSH && so->extra) {
  67         sofree(so->extra);
  68         so->extra=NULL;
  69   }
  70   if (so == slirp->tcp_last_so) {
  71       slirp->tcp_last_so = &slirp->tcb;
  72   } else if (so == slirp->udp_last_so) {
  73       slirp->udp_last_so = &slirp->udb;
  74   } else if (so == slirp->icmp_last_so) {
  75       slirp->icmp_last_so = &slirp->icmp;
  76   }
  77   m_free(so->so_m);
  78
  79   if(so->so_next && so->so_prev)
  80     remque(so);  /* crashes if so is not in a queue */
  81
  82   free(so);
  83 }
  84
  85 size_t sopreprbuf(struct socket *so, struct iovec *iov, int *np)
  86 {
  87         int n, lss, total;
  88         struct sbuf *sb = &so->so_snd;
  89         int len = sb->sb_datalen - sb->sb_cc;
  90         int mss = so->so_tcpcb->t_maxseg;
  91
  92         DEBUG_CALL("sopreprbuf");
  93         DEBUG_ARG("so = %lx", (long )so);
  94
  95         if (len <= 0)
  96                 return 0;
  97
  98         iov[0].iov_base = sb->sb_wptr;
  99         iov[1].iov_base = NULL;
 100         iov[1].iov_len = 0;
 101         if (sb->sb_wptr < sb->sb_rptr) {
 102                 iov[0].iov_len = sb->sb_rptr - sb->sb_wptr;
 103                 /* Should never succeed, but... */
 104                 if (iov[0].iov_len > len)
 105                    iov[0].iov_len = len;
 106                 if (iov[0].iov_len > mss)
 107                    iov[0].iov_len -= iov[0].iov_len%mss;
 108                 n = 1;
 109         } else {
 110                 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_wptr;
 111                 /* Should never succeed, but... */
 112                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 113                 len -= iov[0].iov_len;
 114                 if (len) {
 115                         iov[1].iov_base = sb->sb_data;
 116                         iov[1].iov_len = sb->sb_rptr - sb->sb_data;
 117                         if(iov[1].iov_len > len)
 118                            iov[1].iov_len = len;
 119                         total = iov[0].iov_len + iov[1].iov_len;
 120                         if (total > mss) {
 121                                 lss = total%mss;
 122                                 if (iov[1].iov_len > lss) {
 123                                         iov[1].iov_len -= lss;
 124                                         n = 2;
 125                                 } else {
 126                                         lss -= iov[1].iov_len;
 127                                         iov[0].iov_len -= lss;
 128                                         n = 1;
 129                                 }
 130                         } else
 131                                 n = 2;
 132                 } else {
 133                         if (iov[0].iov_len > mss)
 134                            iov[0].iov_len -= iov[0].iov_len%mss;
 135                         n = 1;
 136                 }
 137         }
 138         if (np)
 139                 *np = n;
 140
 141         return iov[0].iov_len + (n - 1) * iov[1].iov_len;
 142 }
 143
 144 /*
 145  * Read from so's socket into sb_snd, updating all relevant sbuf fields
 146  * NOTE: This will only be called if it is select()ed for reading, so
 147  * a read() of 0 (or less) means it's disconnected
 148  */
 149 int
 150 soread(struct socket *so)
 151 {
 152         int n, nn;
 153         struct sbuf *sb = &so->so_snd;
 154         struct iovec iov[2];
 155
 156         DEBUG_CALL("soread");
 157         DEBUG_ARG("so = %lx", (long )so);
 158
 159         /*
 160          * No need to check if there's enough room to read.
 161          * soread wouldn't have been called if there weren't
 162          */
 163         sopreprbuf(so, iov, &n);
 164
 165 #ifdef HAVE_READV
 166         nn = readv(so->s, (struct iovec *)iov, n);
 167         DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
 168 #else
 169         nn = qemu_recv(so->s, iov[0].iov_base, iov[0].iov_len,0);
 170 #endif
 171         if (nn <= 0) {
 172                 if (nn < 0 && (errno == EINTR || errno == EAGAIN))
 173                         return 0;
 174                 else {
 175                         DEBUG_MISC((dfd, " --- soread() disconnected, nn = %d, errno = %d-%s\n", nn, errno,strerror(errno)));
 176                         sofcantrcvmore(so);
 177                         tcp_sockclosed(sototcpcb(so));
 178                         return -1;
 179                 }
 180         }
 181
 182 #ifndef HAVE_READV
 183         /*
 184          * If there was no error, try and read the second time round
 185          * We read again if n = 2 (ie, there's another part of the buffer)
 186          * and we read as much as we could in the first read
 187          * We don't test for <= 0 this time, because there legitimately
 188          * might not be any more data (since the socket is non-blocking),
 189          * a close will be detected on next iteration.
 190          * A return of -1 wont (shouldn't) happen, since it didn't happen above
 191          */
 192         if (n == 2 && nn == iov[0].iov_len) {
 193             int ret;
 194             ret = qemu_recv(so->s, iov[1].iov_base, iov[1].iov_len,0);
 195             if (ret > 0)
 196                 nn += ret;
 197         }
 198
 199         DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
 200 #endif
 201
 202         /* Update fields */
 203         sb->sb_cc += nn;
 204         sb->sb_wptr += nn;
 205         if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
 206                 sb->sb_wptr -= sb->sb_datalen;
 207         return nn;
 208 }
 209
 210 int soreadbuf(struct socket *so, const char *buf, int size)
 211 {
 212     int n, nn, copy = size;
 213         struct sbuf *sb = &so->so_snd;
 214         struct iovec iov[2];
 215
 216         DEBUG_CALL("soreadbuf");
 217         DEBUG_ARG("so = %lx", (long )so);
 218
 219         /*
 220          * No need to check if there's enough room to read.
 221          * soread wouldn't have been called if there weren't
 222          */
 223         if (sopreprbuf(so, iov, &n) < size)
 224         goto err;
 225
 226     nn = MIN(iov[0].iov_len, copy);
 227     memcpy(iov[0].iov_base, buf, nn);
 228
 229     copy -= nn;
 230     buf += nn;
 231
 232     if (copy == 0)
 233         goto done;
 234
 235     memcpy(iov[1].iov_base, buf, copy);
 236
 237 done:
 238     /* Update fields */
 239         sb->sb_cc += size;
 240         sb->sb_wptr += size;
 241         if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
 242                 sb->sb_wptr -= sb->sb_datalen;
 243     return size;
 244 err:
 245
 246     sofcantrcvmore(so);
 247     tcp_sockclosed(sototcpcb(so));
 248     fprintf(stderr, "soreadbuf buffer to small");
 249     return -1;
 250 }
 251
 252 /*
 253  * Get urgent data
 254  *
 255  * When the socket is created, we set it SO_OOBINLINE,
 256  * so when OOB data arrives, we soread() it and everything
 257  * in the send buffer is sent as urgent data
 258  */
 259 void
 260 sorecvoob(struct socket *so)
 261 {
 262         struct tcpcb *tp = sototcpcb(so);
 263
 264         DEBUG_CALL("sorecvoob");
 265         DEBUG_ARG("so = %lx", (long)so);
 266
 267         /*
 268          * We take a guess at how much urgent data has arrived.
 269          * In most situations, when urgent data arrives, the next
 270          * read() should get all the urgent data.  This guess will
 271          * be wrong however if more data arrives just after the
 272          * urgent data, or the read() doesn't return all the
 273          * urgent data.
 274          */
 275         soread(so);
 276         tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
 277         tp->t_force = 1;
 278         tcp_output(tp);
 279         tp->t_force = 0;
 280 }
 281
 282 /*
 283  * Send urgent data
 284  * There's a lot duplicated code here, but...
 285  */
 286 int
 287 sosendoob(struct socket *so)
 288 {
 289         struct sbuf *sb = &so->so_rcv;
 290         char buff[2048]; /* XXX Shouldn't be sending more oob data than this */
 291
 292         int n, len;
 293
 294         DEBUG_CALL("sosendoob");
 295         DEBUG_ARG("so = %lx", (long)so);
 296         DEBUG_ARG("sb->sb_cc = %d", sb->sb_cc);
 297
 298         if (so->so_urgc > 2048)
 299            so->so_urgc = 2048; /* XXXX */
 300
 301         if (sb->sb_rptr < sb->sb_wptr) {
 302                 /* We can send it directly */
 303                 n = slirp_send(so, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */
 304                 so->so_urgc -= n;
 305
 306                 DEBUG_MISC((dfd, " --- sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
 307         } else {
 308                 /*
 309                  * Since there's no sendv or sendtov like writev,
 310                  * we must copy all data to a linear buffer then
 311                  * send it all
 312                  */
 313                 len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
 314                 if (len > so->so_urgc) len = so->so_urgc;
 315                 memcpy(buff, sb->sb_rptr, len);
 316                 so->so_urgc -= len;
 317                 if (so->so_urgc) {
 318                         n = sb->sb_wptr - sb->sb_data;
 319                         if (n > so->so_urgc) n = so->so_urgc;
 320                         memcpy((buff + len), sb->sb_data, n);
 321                         so->so_urgc -= n;
 322                         len += n;
 323                 }
 324                 n = slirp_send(so, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */
 325 #ifdef DEBUG
 326                 if (n != len)
 327                    DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n"));
 328 #endif
 329                 DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
 330         }
 331
 332         sb->sb_cc -= n;
 333         sb->sb_rptr += n;
 334         if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
 335                 sb->sb_rptr -= sb->sb_datalen;
 336
 337         return n;
 338 }
 339
 340 /*
 341  * Write data from so_rcv to so's socket,
 342  * updating all sbuf field as necessary
 343  */
 344 int
 345 sowrite(struct socket *so)
 346 {
 347         int  n,nn;
 348         struct sbuf *sb = &so->so_rcv;
 349         int len = sb->sb_cc;
 350         struct iovec iov[2];
 351
 352         DEBUG_CALL("sowrite");
 353         DEBUG_ARG("so = %lx", (long)so);
 354
 355         if (so->so_urgc) {
 356                 sosendoob(so);
 357                 if (sb->sb_cc == 0)
 358                         return 0;
 359         }
 360
 361         /*
 362          * No need to check if there's something to write,
 363          * sowrite wouldn't have been called otherwise
 364          */
 365
 366         iov[0].iov_base = sb->sb_rptr;
 367         iov[1].iov_base = NULL;
 368         iov[1].iov_len = 0;
 369         if (sb->sb_rptr < sb->sb_wptr) {
 370                 iov[0].iov_len = sb->sb_wptr - sb->sb_rptr;
 371                 /* Should never succeed, but... */
 372                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 373                 n = 1;
 374         } else {
 375                 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
 376                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 377                 len -= iov[0].iov_len;
 378                 if (len) {
 379                         iov[1].iov_base = sb->sb_data;
 380                         iov[1].iov_len = sb->sb_wptr - sb->sb_data;
 381                         if (iov[1].iov_len > len) iov[1].iov_len = len;
 382                         n = 2;
 383                 } else
 384                         n = 1;
 385         }
 386         /* Check if there's urgent data to send, and if so, send it */
 387
 388 #ifdef HAVE_READV
 389         nn = writev(so->s, (const struct iovec *)iov, n);
 390
 391         DEBUG_MISC((dfd, "  ... wrote nn = %d bytes\n", nn));
 392 #else
 393         nn = slirp_send(so, iov[0].iov_base, iov[0].iov_len,0);
 394 #endif
 395         /* This should never happen, but people tell me it does *shrug* */
 396         if (nn < 0 && (errno == EAGAIN || errno == EINTR))
 397                 return 0;
 398
 399         if (nn <= 0) {
 400                 DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n",
 401                         so->so_state, errno));
 402                 sofcantsendmore(so);
 403                 tcp_sockclosed(sototcpcb(so));
 404                 return -1;
 405         }
 406
 407 #ifndef HAVE_READV
 408         if (n == 2 && nn == iov[0].iov_len) {
 409             int ret;
 410             ret = slirp_send(so, iov[1].iov_base, iov[1].iov_len,0);
 411             if (ret > 0)
 412                 nn += ret;
 413         }
 414         DEBUG_MISC((dfd, "  ... wrote nn = %d bytes\n", nn));
 415 #endif
 416
 417         /* Update sbuf */
 418         sb->sb_cc -= nn;
 419         sb->sb_rptr += nn;
 420         if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
 421                 sb->sb_rptr -= sb->sb_datalen;
 422
 423         /*
 424          * If in DRAIN mode, and there's no more data, set
 425          * it CANTSENDMORE
 426          */
 427         if ((so->so_state & SS_FWDRAIN) && sb->sb_cc == 0)
 428                 sofcantsendmore(so);
 429
 430         return nn;
 431 }
 432
 433 /*
 434  * recvfrom() a UDP socket
 435  */
 436 void
 437 sorecvfrom(struct socket *so)
 438 {
 439         struct sockaddr_in addr;
 440         socklen_t addrlen = sizeof(struct sockaddr_in);
 441
 442         DEBUG_CALL("sorecvfrom");
 443         DEBUG_ARG("so = %lx", (long)so);
 444
 445         if (so->so_type == IPPROTO_ICMP) {   /* This is a "ping" reply */
 446           char buff[256];
 447           int len;
 448
 449           len = recvfrom(so->s, buff, 256, 0,
 450                          (struct sockaddr *)&addr, &addrlen);
 451           /* XXX Check if reply is "correct"? */
 452
 453           if(len == -1 || 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," udp icmp rx errno = %d-%s\n",
 460                         errno,strerror(errno)));
 461             icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
 462           } else {
 463             icmp_reflect(so->so_m);
 464             so->so_m = NULL; /* Don't m_free() it again! */
 465           }
 466           /* No need for this socket anymore, udp_detach it */
 467           udp_detach(so);
 468         } else {                                /* A "normal" UDP packet */
 469           struct mbuf *m;
 470           int len;
 471 #ifdef _WIN32
 472           unsigned long n;
 473 #else
 474           int n;
 475 #endif
 476
 477           m = m_get(so->slirp);
 478           if (!m) {
 479               return;
 480           }
 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             /*
 526              * If this packet was destined for CTL_ADDR,
 527              * make it look like that's where it came from, done by udp_output
 528              */
 529             udp_output(so, m, &addr);
 530           } /* rx error */
 531         } /* if ping packet */
 532 }
 533
 534 /*
 535  * sendto() a socket
 536  */
 537 int
 538 sosendto(struct socket *so, struct mbuf *m)
 539 {
 540         Slirp *slirp = so->slirp;
 541         int ret;
 542         struct sockaddr_in addr;
 543
 544         DEBUG_CALL("sosendto");
 545         DEBUG_ARG("so = %lx", (long)so);
 546         DEBUG_ARG("m = %lx", (long)m);
 547
 548         addr.sin_family = AF_INET;
 549         if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
 550             slirp->vnetwork_addr.s_addr) {
 551           /* It's an alias */
 552           if (so->so_faddr.s_addr == slirp->vnameserver_addr.s_addr) {
 553             if (get_dns_addr(&addr.sin_addr) < 0)
 554               addr.sin_addr = loopback_addr;
 555           } else {
 556             addr.sin_addr = loopback_addr;
 557           }
 558         } else
 559           addr.sin_addr = so->so_faddr;
 560         addr.sin_port = so->so_fport;
 561
 562         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)));
 563
 564         /* Don't care what port we get */
 565         ret = sendto(so->s, m->m_data, m->m_len, 0,
 566                      (struct sockaddr *)&addr, sizeof (struct sockaddr));
 567         if (ret < 0)
 568                 return -1;
 569
 570         /*
 571          * Kill the socket if there's no reply in 4 minutes,
 572          * but only if it's an expirable socket
 573          */
 574         if (so->so_expire)
 575                 so->so_expire = curtime + SO_EXPIRE;
 576         so->so_state &= SS_PERSISTENT_MASK;
 577         so->so_state |= SS_ISFCONNECTED; /* So that it gets select()ed */
 578         return 0;
 579 }
 580
 581 /*
 582  * Listen for incoming TCP connections
 583  */
 584 struct socket *
 585 tcp_listen(Slirp *slirp, uint32_t haddr, u_int hport, uint32_t laddr,
 586            u_int lport, int flags)
 587 {
 588         struct sockaddr_in addr;
 589         struct socket *so;
 590         int s, opt = 1;
 591         socklen_t addrlen = sizeof(addr);
 592         memset(&addr, 0, addrlen);
 593
 594         DEBUG_CALL("tcp_listen");
 595         DEBUG_ARG("haddr = %x", haddr);
 596         DEBUG_ARG("hport = %d", hport);
 597         DEBUG_ARG("laddr = %x", laddr);
 598         DEBUG_ARG("lport = %d", lport);
 599         DEBUG_ARG("flags = %x", flags);
 600
 601         so = socreate(slirp);
 602         if (!so) {
 603           return NULL;
 604         }
 605
 606         /* Don't tcp_attach... we don't need so_snd nor so_rcv */
 607         if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) {
 608                 free(so);
 609                 return NULL;
 610         }
 611         insque(so, &slirp->tcb);
 612
 613         /*
 614          * SS_FACCEPTONCE sockets must time out.
 615          */
 616         if (flags & SS_FACCEPTONCE)
 617            so->so_tcpcb->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT*2;
 618
 619         so->so_state &= SS_PERSISTENT_MASK;
 620         so->so_state |= (SS_FACCEPTCONN | flags);
 621         so->so_lport = lport; /* Kept in network format */
 622         so->so_laddr.s_addr = laddr; /* Ditto */
 623
 624         addr.sin_family = AF_INET;
 625         addr.sin_addr.s_addr = haddr;
 626         addr.sin_port = hport;
 627
 628         if (((s = qemu_socket(AF_INET,SOCK_STREAM,0)) < 0) ||
 629             (setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)) < 0) ||
 630             (bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0) ||
 631             (listen(s,1) < 0)) {
 632                 int tmperrno = errno; /* Don't clobber the real reason we failed */
 633
 634                 close(s);
 635                 sofree(so);
 636                 /* Restore the real errno */
 637 #ifdef _WIN32
 638                 WSASetLastError(tmperrno);
 639 #else
 640                 errno = tmperrno;
 641 #endif
 642                 return NULL;
 643         }
 644         setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
 645
 646         getsockname(s,(struct sockaddr *)&addr,&addrlen);
 647         so->so_fport = addr.sin_port;
 648         if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr)
 649            so->so_faddr = slirp->vhost_addr;
 650         else
 651            so->so_faddr = addr.sin_addr;
 652
 653         so->s = s;
 654         return so;
 655 }
 656
 657 /*
 658  * Various session state calls
 659  * XXX Should be #define's
 660  * The socket state stuff needs work, these often get call 2 or 3
 661  * times each when only 1 was needed
 662  */
 663 void
 664 soisfconnecting(struct socket *so)
 665 {
 666         so->so_state &= ~(SS_NOFDREF|SS_ISFCONNECTED|SS_FCANTRCVMORE|
 667                           SS_FCANTSENDMORE|SS_FWDRAIN);
 668         so->so_state |= SS_ISFCONNECTING; /* Clobber other states */
 669 }
 670
 671 void
 672 soisfconnected(struct socket *so)
 673 {
 674         so->so_state &= ~(SS_ISFCONNECTING|SS_FWDRAIN|SS_NOFDREF);
 675         so->so_state |= SS_ISFCONNECTED; /* Clobber other states */
 676 }
 677
 678 static void
 679 sofcantrcvmore(struct socket *so)
 680 {
 681         if ((so->so_state & SS_NOFDREF) == 0) {
 682                 shutdown(so->s,0);
 683         }
 684         so->so_state &= ~(SS_ISFCONNECTING);
 685         if (so->so_state & SS_FCANTSENDMORE) {
 686            so->so_state &= SS_PERSISTENT_MASK;
 687            so->so_state |= SS_NOFDREF; /* Don't select it */
 688         } else {
 689            so->so_state |= SS_FCANTRCVMORE;
 690         }
 691 }
 692
 693 static void
 694 sofcantsendmore(struct socket *so)
 695 {
 696         if ((so->so_state & SS_NOFDREF) == 0) {
 697             shutdown(so->s,1);           /* send FIN to fhost */
 698         }
 699         so->so_state &= ~(SS_ISFCONNECTING);
 700         if (so->so_state & SS_FCANTRCVMORE) {
 701            so->so_state &= SS_PERSISTENT_MASK;
 702            so->so_state |= SS_NOFDREF; /* as above */
 703         } else {
 704            so->so_state |= SS_FCANTSENDMORE;
 705         }
 706 }
 707
 708 /*
 709  * Set write drain mode
 710  * Set CANTSENDMORE once all data has been write()n
 711  */
 712 void
 713 sofwdrain(struct socket *so)
 714 {
 715         if (so->so_rcv.sb_cc)
 716                 so->so_state |= SS_FWDRAIN;
 717         else
 718                 sofcantsendmore(so);
 719 }