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(head, laddr, lport, faddr, fport)
  29         struct socket *head;
  30         struct in_addr laddr;
  31         u_int lport;
  32         struct in_addr faddr;
  33         u_int fport;
  34 {
  35         struct socket *so;
  36
  37         for (so = head->so_next; so != head; so = so->so_next) {
  38                 if (so->so_lport == lport &&
  39                     so->so_laddr.s_addr == laddr.s_addr &&
  40                     so->so_faddr.s_addr == faddr.s_addr &&
  41                     so->so_fport == fport)
  42                    break;
  43         }
  44
  45         if (so == head)
  46            return (struct socket *)NULL;
  47         return so;
  48
  49 }
  50
  51 /*
  52  * Create a new socket, initialise the fields
  53  * It is the responsibility of the caller to
  54  * insque() it into the correct linked-list
  55  */
  56 struct socket *
  57 socreate()
  58 {
  59   struct socket *so;
  60
  61   so = (struct socket *)malloc(sizeof(struct socket));
  62   if(so) {
  63     memset(so, 0, sizeof(struct socket));
  64     so->so_state = SS_NOFDREF;
  65     so->s = -1;
  66   }
  67   return(so);
  68 }
  69
  70 /*
  71  * remque and free a socket, clobber cache
  72  */
  73 void
  74 sofree(so)
  75         struct socket *so;
  76 {
  77   if (so->so_emu==EMU_RSH && so->extra) {
  78         sofree(so->extra);
  79         so->extra=NULL;
  80   }
  81   if (so == tcp_last_so)
  82     tcp_last_so = &tcb;
  83   else if (so == udp_last_so)
  84     udp_last_so = &udb;
  85
  86   m_free(so->so_m);
  87
  88   if(so->so_next && so->so_prev)
  89     remque(so);  /* crashes if so is not in a queue */
  90
  91   free(so);
  92 }
  93
  94 size_t sopreprbuf(struct socket *so, struct iovec *iov, int *np)
  95 {
  96         int n, lss, total;
  97         struct sbuf *sb = &so->so_snd;
  98         int len = sb->sb_datalen - sb->sb_cc;
  99         int mss = so->so_tcpcb->t_maxseg;
 100
 101         DEBUG_CALL("sopreprbuf");
 102         DEBUG_ARG("so = %lx", (long )so);
 103
 104         len = sb->sb_datalen - sb->sb_cc;
 105
 106         if (len <= 0)
 107                 return 0;
 108
 109         iov[0].iov_base = sb->sb_wptr;
 110         iov[1].iov_base = NULL;
 111         iov[1].iov_len = 0;
 112         if (sb->sb_wptr < sb->sb_rptr) {
 113                 iov[0].iov_len = sb->sb_rptr - sb->sb_wptr;
 114                 /* Should never succeed, but... */
 115                 if (iov[0].iov_len > len)
 116                    iov[0].iov_len = len;
 117                 if (iov[0].iov_len > mss)
 118                    iov[0].iov_len -= iov[0].iov_len%mss;
 119                 n = 1;
 120         } else {
 121                 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_wptr;
 122                 /* Should never succeed, but... */
 123                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 124                 len -= iov[0].iov_len;
 125                 if (len) {
 126                         iov[1].iov_base = sb->sb_data;
 127                         iov[1].iov_len = sb->sb_rptr - sb->sb_data;
 128                         if(iov[1].iov_len > len)
 129                            iov[1].iov_len = len;
 130                         total = iov[0].iov_len + iov[1].iov_len;
 131                         if (total > mss) {
 132                                 lss = total%mss;
 133                                 if (iov[1].iov_len > lss) {
 134                                         iov[1].iov_len -= lss;
 135                                         n = 2;
 136                                 } else {
 137                                         lss -= iov[1].iov_len;
 138                                         iov[0].iov_len -= lss;
 139                                         n = 1;
 140                                 }
 141                         } else
 142                                 n = 2;
 143                 } else {
 144                         if (iov[0].iov_len > mss)
 145                            iov[0].iov_len -= iov[0].iov_len%mss;
 146                         n = 1;
 147                 }
 148         }
 149         if (np)
 150                 *np = n;
 151
 152         return iov[0].iov_len + (n - 1) * iov[1].iov_len;
 153 }
 154
 155 /*
 156  * Read from so's socket into sb_snd, updating all relevant sbuf fields
 157  * NOTE: This will only be called if it is select()ed for reading, so
 158  * a read() of 0 (or less) means it's disconnected
 159  */
 160 int
 161 soread(so)
 162         struct socket *so;
 163 {
 164         int n, nn;
 165         struct sbuf *sb = &so->so_snd;
 166         struct iovec iov[2];
 167
 168         DEBUG_CALL("soread");
 169         DEBUG_ARG("so = %lx", (long )so);
 170
 171         /*
 172          * No need to check if there's enough room to read.
 173          * soread wouldn't have been called if there weren't
 174          */
 175         sopreprbuf(so, iov, &n);
 176
 177 #ifdef HAVE_READV
 178         nn = readv(so->s, (struct iovec *)iov, n);
 179         DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
 180 #else
 181         nn = recv(so->s, iov[0].iov_base, iov[0].iov_len,0);
 182 #endif
 183         if (nn <= 0) {
 184                 if (nn < 0 && (errno == EINTR || errno == EAGAIN))
 185                         return 0;
 186                 else {
 187                         DEBUG_MISC((dfd, " --- soread() disconnected, nn = %d, errno = %d-%s\n", nn, errno,strerror(errno)));
 188                         sofcantrcvmore(so);
 189                         tcp_sockclosed(sototcpcb(so));
 190                         return -1;
 191                 }
 192         }
 193
 194 #ifndef HAVE_READV
 195         /*
 196          * If there was no error, try and read the second time round
 197          * We read again if n = 2 (ie, there's another part of the buffer)
 198          * and we read as much as we could in the first read
 199          * We don't test for <= 0 this time, because there legitimately
 200          * might not be any more data (since the socket is non-blocking),
 201          * a close will be detected on next iteration.
 202          * A return of -1 wont (shouldn't) happen, since it didn't happen above
 203          */
 204         if (n == 2 && nn == iov[0].iov_len) {
 205             int ret;
 206             ret = recv(so->s, iov[1].iov_base, iov[1].iov_len,0);
 207             if (ret > 0)
 208                 nn += ret;
 209         }
 210
 211         DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn));
 212 #endif
 213
 214         /* Update fields */
 215         sb->sb_cc += nn;
 216         sb->sb_wptr += nn;
 217         if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
 218                 sb->sb_wptr -= sb->sb_datalen;
 219         return nn;
 220 }
 221
 222 int soreadbuf(struct socket *so, const char *buf, int size)
 223 {
 224     int n, nn, copy = size;
 225         struct sbuf *sb = &so->so_snd;
 226         struct iovec iov[2];
 227
 228         DEBUG_CALL("soreadbuf");
 229         DEBUG_ARG("so = %lx", (long )so);
 230
 231         /*
 232          * No need to check if there's enough room to read.
 233          * soread wouldn't have been called if there weren't
 234          */
 235         if (sopreprbuf(so, iov, &n) < size)
 236         goto err;
 237
 238     nn = MIN(iov[0].iov_len, copy);
 239     memcpy(iov[0].iov_base, buf, nn);
 240
 241     copy -= nn;
 242     buf += nn;
 243
 244     if (copy == 0)
 245         goto done;
 246
 247     memcpy(iov[1].iov_base, buf, copy);
 248
 249 done:
 250     /* Update fields */
 251         sb->sb_cc += size;
 252         sb->sb_wptr += size;
 253         if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
 254                 sb->sb_wptr -= sb->sb_datalen;
 255     return size;
 256 err:
 257
 258     sofcantrcvmore(so);
 259     tcp_sockclosed(sototcpcb(so));
 260     fprintf(stderr, "soreadbuf buffer to small");
 261     return -1;
 262 }
 263
 264 /*
 265  * Get urgent data
 266  *
 267  * When the socket is created, we set it SO_OOBINLINE,
 268  * so when OOB data arrives, we soread() it and everything
 269  * in the send buffer is sent as urgent data
 270  */
 271 void
 272 sorecvoob(so)
 273         struct socket *so;
 274 {
 275         struct tcpcb *tp = sototcpcb(so);
 276
 277         DEBUG_CALL("sorecvoob");
 278         DEBUG_ARG("so = %lx", (long)so);
 279
 280         /*
 281          * We take a guess at how much urgent data has arrived.
 282          * In most situations, when urgent data arrives, the next
 283          * read() should get all the urgent data.  This guess will
 284          * be wrong however if more data arrives just after the
 285          * urgent data, or the read() doesn't return all the
 286          * urgent data.
 287          */
 288         soread(so);
 289         tp->snd_up = tp->snd_una + so->so_snd.sb_cc;
 290         tp->t_force = 1;
 291         tcp_output(tp);
 292         tp->t_force = 0;
 293 }
 294
 295 /*
 296  * Send urgent data
 297  * There's a lot duplicated code here, but...
 298  */
 299 int
 300 sosendoob(so)
 301         struct socket *so;
 302 {
 303         struct sbuf *sb = &so->so_rcv;
 304         char buff[2048]; /* XXX Shouldn't be sending more oob data than this */
 305
 306         int n, len;
 307
 308         DEBUG_CALL("sosendoob");
 309         DEBUG_ARG("so = %lx", (long)so);
 310         DEBUG_ARG("sb->sb_cc = %d", sb->sb_cc);
 311
 312         if (so->so_urgc > 2048)
 313            so->so_urgc = 2048; /* XXXX */
 314
 315         if (sb->sb_rptr < sb->sb_wptr) {
 316                 /* We can send it directly */
 317                 n = slirp_send(so, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */
 318                 so->so_urgc -= n;
 319
 320                 DEBUG_MISC((dfd, " --- sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
 321         } else {
 322                 /*
 323                  * Since there's no sendv or sendtov like writev,
 324                  * we must copy all data to a linear buffer then
 325                  * send it all
 326                  */
 327                 len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
 328                 if (len > so->so_urgc) len = so->so_urgc;
 329                 memcpy(buff, sb->sb_rptr, len);
 330                 so->so_urgc -= len;
 331                 if (so->so_urgc) {
 332                         n = sb->sb_wptr - sb->sb_data;
 333                         if (n > so->so_urgc) n = so->so_urgc;
 334                         memcpy((buff + len), sb->sb_data, n);
 335                         so->so_urgc -= n;
 336                         len += n;
 337                 }
 338                 n = slirp_send(so, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */
 339 #ifdef DEBUG
 340                 if (n != len)
 341                    DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n"));
 342 #endif
 343                 DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc));
 344         }
 345
 346         sb->sb_cc -= n;
 347         sb->sb_rptr += n;
 348         if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
 349                 sb->sb_rptr -= sb->sb_datalen;
 350
 351         return n;
 352 }
 353
 354 /*
 355  * Write data from so_rcv to so's socket,
 356  * updating all sbuf field as necessary
 357  */
 358 int
 359 sowrite(so)
 360         struct socket *so;
 361 {
 362         int  n,nn;
 363         struct sbuf *sb = &so->so_rcv;
 364         int len = sb->sb_cc;
 365         struct iovec iov[2];
 366
 367         DEBUG_CALL("sowrite");
 368         DEBUG_ARG("so = %lx", (long)so);
 369
 370         if (so->so_urgc) {
 371                 sosendoob(so);
 372                 if (sb->sb_cc == 0)
 373                         return 0;
 374         }
 375
 376         /*
 377          * No need to check if there's something to write,
 378          * sowrite wouldn't have been called otherwise
 379          */
 380
 381         len = sb->sb_cc;
 382
 383         iov[0].iov_base = sb->sb_rptr;
 384         iov[1].iov_base = NULL;
 385         iov[1].iov_len = 0;
 386         if (sb->sb_rptr < sb->sb_wptr) {
 387                 iov[0].iov_len = sb->sb_wptr - sb->sb_rptr;
 388                 /* Should never succeed, but... */
 389                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 390                 n = 1;
 391         } else {
 392                 iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
 393                 if (iov[0].iov_len > len) iov[0].iov_len = len;
 394                 len -= iov[0].iov_len;
 395                 if (len) {
 396                         iov[1].iov_base = sb->sb_data;
 397                         iov[1].iov_len = sb->sb_wptr - sb->sb_data;
 398                         if (iov[1].iov_len > len) iov[1].iov_len = len;
 399                         n = 2;
 400                 } else
 401                         n = 1;
 402         }
 403         /* Check if there's urgent data to send, and if so, send it */
 404
 405 #ifdef HAVE_READV
 406         nn = writev(so->s, (const struct iovec *)iov, n);
 407
 408         DEBUG_MISC((dfd, "  ... wrote nn = %d bytes\n", nn));
 409 #else
 410         nn = slirp_send(so, iov[0].iov_base, iov[0].iov_len,0);
 411 #endif
 412         /* This should never happen, but people tell me it does *shrug* */
 413         if (nn < 0 && (errno == EAGAIN || errno == EINTR))
 414                 return 0;
 415
 416         if (nn <= 0) {
 417                 DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n",
 418                         so->so_state, errno));
 419                 sofcantsendmore(so);
 420                 tcp_sockclosed(sototcpcb(so));
 421                 return -1;
 422         }
 423
 424 #ifndef HAVE_READV
 425         if (n == 2 && nn == iov[0].iov_len) {
 426             int ret;
 427             ret = slirp_send(so, iov[1].iov_base, iov[1].iov_len,0);
 428             if (ret > 0)
 429                 nn += ret;
 430         }
 431         DEBUG_MISC((dfd, "  ... wrote nn = %d bytes\n", nn));
 432 #endif
 433
 434         /* Update sbuf */
 435         sb->sb_cc -= nn;
 436         sb->sb_rptr += nn;
 437         if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
 438                 sb->sb_rptr -= sb->sb_datalen;
 439
 440         /*
 441          * If in DRAIN mode, and there's no more data, set
 442          * it CANTSENDMORE
 443          */
 444         if ((so->so_state & SS_FWDRAIN) && sb->sb_cc == 0)
 445                 sofcantsendmore(so);
 446
 447         return nn;
 448 }
 449
 450 /*
 451  * recvfrom() a UDP socket
 452  */
 453 void
 454 sorecvfrom(so)
 455         struct socket *so;
 456 {
 457         struct sockaddr_in addr;
 458         socklen_t addrlen = sizeof(struct sockaddr_in);
 459
 460         DEBUG_CALL("sorecvfrom");
 461         DEBUG_ARG("so = %lx", (long)so);
 462
 463         if (so->so_type == IPPROTO_ICMP) {   /* This is a "ping" reply */
 464           char buff[256];
 465           int len;
 466
 467           len = recvfrom(so->s, buff, 256, 0,
 468                          (struct sockaddr *)&addr, &addrlen);
 469           /* XXX Check if reply is "correct"? */
 470
 471           if(len == -1 || len == 0) {
 472             u_char code=ICMP_UNREACH_PORT;
 473
 474             if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
 475             else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
 476
 477             DEBUG_MISC((dfd," udp icmp rx errno = %d-%s\n",
 478                         errno,strerror(errno)));
 479             icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
 480           } else {
 481             icmp_reflect(so->so_m);
 482             so->so_m = 0; /* Don't m_free() it again! */
 483           }
 484           /* No need for this socket anymore, udp_detach it */
 485           udp_detach(so);
 486         } else {                                /* A "normal" UDP packet */
 487           struct mbuf *m;
 488           int len, n;
 489
 490           if (!(m = m_get())) return;
 491           m->m_data += IF_MAXLINKHDR;
 492
 493           /*
 494            * XXX Shouldn't FIONREAD packets destined for port 53,
 495            * but I don't know the max packet size for DNS lookups
 496            */
 497           len = M_FREEROOM(m);
 498           /* if (so->so_fport != htons(53)) { */
 499           ioctlsocket(so->s, FIONREAD, &n);
 500
 501           if (n > len) {
 502             n = (m->m_data - m->m_dat) + m->m_len + n + 1;
 503             m_inc(m, n);
 504             len = M_FREEROOM(m);
 505           }
 506           /* } */
 507
 508           m->m_len = recvfrom(so->s, m->m_data, len, 0,
 509                               (struct sockaddr *)&addr, &addrlen);
 510           DEBUG_MISC((dfd, " did recvfrom %d, errno = %d-%s\n",
 511                       m->m_len, errno,strerror(errno)));
 512           if(m->m_len<0) {
 513             u_char code=ICMP_UNREACH_PORT;
 514
 515             if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST;
 516             else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET;
 517
 518             DEBUG_MISC((dfd," rx error, tx icmp ICMP_UNREACH:%i\n", code));
 519             icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno));
 520             m_free(m);
 521           } else {
 522           /*
 523            * Hack: domain name lookup will be used the most for UDP,
 524            * and since they'll only be used once there's no need
 525            * for the 4 minute (or whatever) timeout... So we time them
 526            * out much quicker (10 seconds  for now...)
 527            */
 528             if (so->so_expire) {
 529               if (so->so_fport == htons(53))
 530                 so->so_expire = curtime + SO_EXPIREFAST;
 531               else
 532                 so->so_expire = curtime + SO_EXPIRE;
 533             }
 534
 535             /*          if (m->m_len == len) {
 536              *                  m_inc(m, MINCSIZE);
 537              *                  m->m_len = 0;
 538              *          }
 539              */
 540
 541             /*
 542              * If this packet was destined for CTL_ADDR,
 543              * make it look like that's where it came from, done by udp_output
 544              */
 545             udp_output(so, m, &addr);
 546           } /* rx error */
 547         } /* if ping packet */
 548 }
 549
 550 /*
 551  * sendto() a socket
 552  */
 553 int
 554 sosendto(so, m)
 555         struct socket *so;
 556         struct mbuf *m;
 557 {
 558         int ret;
 559         struct sockaddr_in addr;
 560
 561         DEBUG_CALL("sosendto");
 562         DEBUG_ARG("so = %lx", (long)so);
 563         DEBUG_ARG("m = %lx", (long)m);
 564
 565         addr.sin_family = AF_INET;
 566         if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
 567           /* It's an alias */
 568           switch(ntohl(so->so_faddr.s_addr) & 0xff) {
 569           case CTL_DNS:
 570             addr.sin_addr = dns_addr;
 571             break;
 572           case CTL_ALIAS:
 573           default:
 574             addr.sin_addr = loopback_addr;
 575             break;
 576           }
 577         } else
 578           addr.sin_addr = so->so_faddr;
 579         addr.sin_port = so->so_fport;
 580
 581         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)));
 582
 583         /* Don't care what port we get */
 584         ret = sendto(so->s, m->m_data, m->m_len, 0,
 585                      (struct sockaddr *)&addr, sizeof (struct sockaddr));
 586         if (ret < 0)
 587                 return -1;
 588
 589         /*
 590          * Kill the socket if there's no reply in 4 minutes,
 591          * but only if it's an expirable socket
 592          */
 593         if (so->so_expire)
 594                 so->so_expire = curtime + SO_EXPIRE;
 595         so->so_state = SS_ISFCONNECTED; /* So that it gets select()ed */
 596         return 0;
 597 }
 598
 599 /*
 600  * XXX This should really be tcp_listen
 601  */
 602 struct socket *
 603 solisten(port, laddr, lport, flags)
 604         u_int port;
 605         u_int32_t laddr;
 606         u_int lport;
 607         int flags;
 608 {
 609         struct sockaddr_in addr;
 610         struct socket *so;
 611         int s, opt = 1;
 612         socklen_t addrlen = sizeof(addr);
 613
 614         DEBUG_CALL("solisten");
 615         DEBUG_ARG("port = %d", port);
 616         DEBUG_ARG("laddr = %x", laddr);
 617         DEBUG_ARG("lport = %d", lport);
 618         DEBUG_ARG("flags = %x", flags);
 619
 620         if ((so = socreate()) == NULL) {
 621           /* free(so);      Not sofree() ??? free(NULL) == NOP */
 622           return NULL;
 623         }
 624
 625         /* Don't tcp_attach... we don't need so_snd nor so_rcv */
 626         if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) {
 627                 free(so);
 628                 return NULL;
 629         }
 630         insque(so,&tcb);
 631
 632         /*
 633          * SS_FACCEPTONCE sockets must time out.
 634          */
 635         if (flags & SS_FACCEPTONCE)
 636            so->so_tcpcb->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT*2;
 637
 638         so->so_state = (SS_FACCEPTCONN|flags);
 639         so->so_lport = lport; /* Kept in network format */
 640         so->so_laddr.s_addr = laddr; /* Ditto */
 641
 642         addr.sin_family = AF_INET;
 643         addr.sin_addr.s_addr = INADDR_ANY;
 644         addr.sin_port = port;
 645
 646         if (((s = socket(AF_INET,SOCK_STREAM,0)) < 0) ||
 647             (setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)) < 0) ||
 648             (bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0) ||
 649             (listen(s,1) < 0)) {
 650                 int tmperrno = errno; /* Don't clobber the real reason we failed */
 651
 652                 close(s);
 653                 sofree(so);
 654                 /* Restore the real errno */
 655 #ifdef _WIN32
 656                 WSASetLastError(tmperrno);
 657 #else
 658                 errno = tmperrno;
 659 #endif
 660                 return NULL;
 661         }
 662         setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int));
 663
 664         getsockname(s,(struct sockaddr *)&addr,&addrlen);
 665         so->so_fport = addr.sin_port;
 666         if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr)
 667            so->so_faddr = alias_addr;
 668         else
 669            so->so_faddr = addr.sin_addr;
 670
 671         so->s = s;
 672         return so;
 673 }
 674
 675 #if 0
 676 /*
 677  * Data is available in so_rcv
 678  * Just write() the data to the socket
 679  * XXX not yet...
 680  */
 681 static void
 682 sorwakeup(so)
 683         struct socket *so;
 684 {
 685 /*      sowrite(so); */
 686 /*      FD_CLR(so->s,&writefds); */
 687 }
 688
 689 /*
 690  * Data has been freed in so_snd
 691  * We have room for a read() if we want to
 692  * For now, don't read, it'll be done in the main loop
 693  */
 694 static void
 695 sowwakeup(so)
 696         struct socket *so;
 697 {
 698         /* Nothing, yet */
 699 }
 700 #endif
 701
 702 /*
 703  * Various session state calls
 704  * XXX Should be #define's
 705  * The socket state stuff needs work, these often get call 2 or 3
 706  * times each when only 1 was needed
 707  */
 708 void
 709 soisfconnecting(so)
 710         register struct socket *so;
 711 {
 712         so->so_state &= ~(SS_NOFDREF|SS_ISFCONNECTED|SS_FCANTRCVMORE|
 713                           SS_FCANTSENDMORE|SS_FWDRAIN);
 714         so->so_state |= SS_ISFCONNECTING; /* Clobber other states */
 715 }
 716
 717 void
 718 soisfconnected(so)
 719         register struct socket *so;
 720 {
 721         so->so_state &= ~(SS_ISFCONNECTING|SS_FWDRAIN|SS_NOFDREF);
 722         so->so_state |= SS_ISFCONNECTED; /* Clobber other states */
 723 }
 724
 725 static void
 726 sofcantrcvmore(struct socket *so)
 727 {
 728         if ((so->so_state & SS_NOFDREF) == 0) {
 729                 shutdown(so->s,0);
 730                 if(global_writefds) {
 731                   FD_CLR(so->s,global_writefds);
 732                 }
 733         }
 734         so->so_state &= ~(SS_ISFCONNECTING);
 735         if (so->so_state & SS_FCANTSENDMORE)
 736            so->so_state = SS_NOFDREF; /* Don't select it */ /* XXX close() here as well? */
 737         else
 738            so->so_state |= SS_FCANTRCVMORE;
 739 }
 740
 741 static void
 742 sofcantsendmore(struct socket *so)
 743 {
 744         if ((so->so_state & SS_NOFDREF) == 0) {
 745             shutdown(so->s,1);           /* send FIN to fhost */
 746             if (global_readfds) {
 747                 FD_CLR(so->s,global_readfds);
 748             }
 749             if (global_xfds) {
 750                 FD_CLR(so->s,global_xfds);
 751             }
 752         }
 753         so->so_state &= ~(SS_ISFCONNECTING);
 754         if (so->so_state & SS_FCANTRCVMORE)
 755            so->so_state = SS_NOFDREF; /* as above */
 756         else
 757            so->so_state |= SS_FCANTSENDMORE;
 758 }
 759
 760 void
 761 soisfdisconnected(so)
 762         struct socket *so;
 763 {
 764 /*      so->so_state &= ~(SS_ISFCONNECTING|SS_ISFCONNECTED); */
 765 /*      close(so->s); */
 766 /*      so->so_state = SS_ISFDISCONNECTED; */
 767         /*
 768          * XXX Do nothing ... ?
 769          */
 770 }
 771
 772 /*
 773  * Set write drain mode
 774  * Set CANTSENDMORE once all data has been write()n
 775  */
 776 void
 777 sofwdrain(so)
 778         struct socket *so;
 779 {
 780         if (so->so_rcv.sb_cc)
 781                 so->so_state |= SS_FWDRAIN;
 782         else
 783                 sofcantsendmore(so);
 784 }