| /* |
| * Copyright (c) 1995 Danny Gasparovski. |
| * |
| * Please read the file COPYRIGHT for the |
| * terms and conditions of the copyright. |
| */ |
| |
| #define WANT_SYS_IOCTL_H |
| #include <slirp.h> |
| #include "ip_icmp.h" |
| #ifdef __sun__ |
| #include <sys/filio.h> |
| #endif |
| |
| static void sofcantrcvmore(struct socket *so); |
| static void sofcantsendmore(struct socket *so); |
| |
| #if 0 |
| static void |
| so_init() |
| { |
| /* Nothing yet */ |
| } |
| #endif |
| |
| struct socket * |
| solookup(head, laddr, lport, faddr, fport) |
| struct socket *head; |
| struct in_addr laddr; |
| u_int lport; |
| struct in_addr faddr; |
| u_int fport; |
| { |
| struct socket *so; |
| |
| for (so = head->so_next; so != head; so = so->so_next) { |
| if (so->so_lport == lport && |
| so->so_laddr.s_addr == laddr.s_addr && |
| so->so_faddr.s_addr == faddr.s_addr && |
| so->so_fport == fport) |
| break; |
| } |
| |
| if (so == head) |
| return (struct socket *)NULL; |
| return so; |
| |
| } |
| |
| /* |
| * Create a new socket, initialise the fields |
| * It is the responsibility of the caller to |
| * insque() it into the correct linked-list |
| */ |
| struct socket * |
| socreate() |
| { |
| struct socket *so; |
| |
| so = (struct socket *)malloc(sizeof(struct socket)); |
| if(so) { |
| memset(so, 0, sizeof(struct socket)); |
| so->so_state = SS_NOFDREF; |
| so->s = -1; |
| } |
| return(so); |
| } |
| |
| /* |
| * remque and free a socket, clobber cache |
| */ |
| void |
| sofree(so) |
| struct socket *so; |
| { |
| if (so->so_emu==EMU_RSH && so->extra) { |
| sofree(so->extra); |
| so->extra=NULL; |
| } |
| if (so == tcp_last_so) |
| tcp_last_so = &tcb; |
| else if (so == udp_last_so) |
| udp_last_so = &udb; |
| |
| m_free(so->so_m); |
| |
| if(so->so_next && so->so_prev) |
| remque(so); /* crashes if so is not in a queue */ |
| |
| free(so); |
| } |
| |
| /* |
| * Read from so's socket into sb_snd, updating all relevant sbuf fields |
| * NOTE: This will only be called if it is select()ed for reading, so |
| * a read() of 0 (or less) means it's disconnected |
| */ |
| int |
| soread(so) |
| struct socket *so; |
| { |
| int n, nn, lss, total; |
| struct sbuf *sb = &so->so_snd; |
| int len = sb->sb_datalen - sb->sb_cc; |
| struct iovec iov[2]; |
| int mss = so->so_tcpcb->t_maxseg; |
| |
| DEBUG_CALL("soread"); |
| DEBUG_ARG("so = %lx", (long )so); |
| |
| /* |
| * No need to check if there's enough room to read. |
| * soread wouldn't have been called if there weren't |
| */ |
| |
| len = sb->sb_datalen - sb->sb_cc; |
| |
| iov[0].iov_base = sb->sb_wptr; |
| iov[1].iov_base = NULL; |
| iov[1].iov_len = 0; |
| if (sb->sb_wptr < sb->sb_rptr) { |
| iov[0].iov_len = sb->sb_rptr - sb->sb_wptr; |
| /* Should never succeed, but... */ |
| if (iov[0].iov_len > len) |
| iov[0].iov_len = len; |
| if (iov[0].iov_len > mss) |
| iov[0].iov_len -= iov[0].iov_len%mss; |
| n = 1; |
| } else { |
| iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_wptr; |
| /* Should never succeed, but... */ |
| if (iov[0].iov_len > len) iov[0].iov_len = len; |
| len -= iov[0].iov_len; |
| if (len) { |
| iov[1].iov_base = sb->sb_data; |
| iov[1].iov_len = sb->sb_rptr - sb->sb_data; |
| if(iov[1].iov_len > len) |
| iov[1].iov_len = len; |
| total = iov[0].iov_len + iov[1].iov_len; |
| if (total > mss) { |
| lss = total%mss; |
| if (iov[1].iov_len > lss) { |
| iov[1].iov_len -= lss; |
| n = 2; |
| } else { |
| lss -= iov[1].iov_len; |
| iov[0].iov_len -= lss; |
| n = 1; |
| } |
| } else |
| n = 2; |
| } else { |
| if (iov[0].iov_len > mss) |
| iov[0].iov_len -= iov[0].iov_len%mss; |
| n = 1; |
| } |
| } |
| |
| #ifdef HAVE_READV |
| nn = readv(so->s, (struct iovec *)iov, n); |
| DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn)); |
| #else |
| nn = recv(so->s, iov[0].iov_base, iov[0].iov_len,0); |
| #endif |
| if (nn <= 0) { |
| if (nn < 0 && (errno == EINTR || errno == EAGAIN)) |
| return 0; |
| else { |
| DEBUG_MISC((dfd, " --- soread() disconnected, nn = %d, errno = %d-%s\n", nn, errno,strerror(errno))); |
| sofcantrcvmore(so); |
| tcp_sockclosed(sototcpcb(so)); |
| return -1; |
| } |
| } |
| |
| #ifndef HAVE_READV |
| /* |
| * If there was no error, try and read the second time round |
| * We read again if n = 2 (ie, there's another part of the buffer) |
| * and we read as much as we could in the first read |
| * We don't test for <= 0 this time, because there legitimately |
| * might not be any more data (since the socket is non-blocking), |
| * a close will be detected on next iteration. |
| * A return of -1 wont (shouldn't) happen, since it didn't happen above |
| */ |
| if (n == 2 && nn == iov[0].iov_len) { |
| int ret; |
| ret = recv(so->s, iov[1].iov_base, iov[1].iov_len,0); |
| if (ret > 0) |
| nn += ret; |
| } |
| |
| DEBUG_MISC((dfd, " ... read nn = %d bytes\n", nn)); |
| #endif |
| |
| /* Update fields */ |
| sb->sb_cc += nn; |
| sb->sb_wptr += nn; |
| if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen)) |
| sb->sb_wptr -= sb->sb_datalen; |
| return nn; |
| } |
| |
| /* |
| * Get urgent data |
| * |
| * When the socket is created, we set it SO_OOBINLINE, |
| * so when OOB data arrives, we soread() it and everything |
| * in the send buffer is sent as urgent data |
| */ |
| void |
| sorecvoob(so) |
| struct socket *so; |
| { |
| struct tcpcb *tp = sototcpcb(so); |
| |
| DEBUG_CALL("sorecvoob"); |
| DEBUG_ARG("so = %lx", (long)so); |
| |
| /* |
| * We take a guess at how much urgent data has arrived. |
| * In most situations, when urgent data arrives, the next |
| * read() should get all the urgent data. This guess will |
| * be wrong however if more data arrives just after the |
| * urgent data, or the read() doesn't return all the |
| * urgent data. |
| */ |
| soread(so); |
| tp->snd_up = tp->snd_una + so->so_snd.sb_cc; |
| tp->t_force = 1; |
| tcp_output(tp); |
| tp->t_force = 0; |
| } |
| |
| /* |
| * Send urgent data |
| * There's a lot duplicated code here, but... |
| */ |
| int |
| sosendoob(so) |
| struct socket *so; |
| { |
| struct sbuf *sb = &so->so_rcv; |
| char buff[2048]; /* XXX Shouldn't be sending more oob data than this */ |
| |
| int n, len; |
| |
| DEBUG_CALL("sosendoob"); |
| DEBUG_ARG("so = %lx", (long)so); |
| DEBUG_ARG("sb->sb_cc = %d", sb->sb_cc); |
| |
| if (so->so_urgc > 2048) |
| so->so_urgc = 2048; /* XXXX */ |
| |
| if (sb->sb_rptr < sb->sb_wptr) { |
| /* We can send it directly */ |
| n = send(so->s, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* |MSG_DONTWAIT)); */ |
| so->so_urgc -= n; |
| |
| DEBUG_MISC((dfd, " --- sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc)); |
| } else { |
| /* |
| * Since there's no sendv or sendtov like writev, |
| * we must copy all data to a linear buffer then |
| * send it all |
| */ |
| len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr; |
| if (len > so->so_urgc) len = so->so_urgc; |
| memcpy(buff, sb->sb_rptr, len); |
| so->so_urgc -= len; |
| if (so->so_urgc) { |
| n = sb->sb_wptr - sb->sb_data; |
| if (n > so->so_urgc) n = so->so_urgc; |
| memcpy((buff + len), sb->sb_data, n); |
| so->so_urgc -= n; |
| len += n; |
| } |
| n = send(so->s, buff, len, (MSG_OOB)); /* |MSG_DONTWAIT)); */ |
| #ifdef DEBUG |
| if (n != len) |
| DEBUG_ERROR((dfd, "Didn't send all data urgently XXXXX\n")); |
| #endif |
| DEBUG_MISC((dfd, " ---2 sent %d bytes urgent data, %d urgent bytes left\n", n, so->so_urgc)); |
| } |
| |
| sb->sb_cc -= n; |
| sb->sb_rptr += n; |
| if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen)) |
| sb->sb_rptr -= sb->sb_datalen; |
| |
| return n; |
| } |
| |
| /* |
| * Write data from so_rcv to so's socket, |
| * updating all sbuf field as necessary |
| */ |
| int |
| sowrite(so) |
| struct socket *so; |
| { |
| int n,nn; |
| struct sbuf *sb = &so->so_rcv; |
| int len = sb->sb_cc; |
| struct iovec iov[2]; |
| |
| DEBUG_CALL("sowrite"); |
| DEBUG_ARG("so = %lx", (long)so); |
| |
| if (so->so_urgc) { |
| sosendoob(so); |
| if (sb->sb_cc == 0) |
| return 0; |
| } |
| |
| /* |
| * No need to check if there's something to write, |
| * sowrite wouldn't have been called otherwise |
| */ |
| |
| len = sb->sb_cc; |
| |
| iov[0].iov_base = sb->sb_rptr; |
| iov[1].iov_base = NULL; |
| iov[1].iov_len = 0; |
| if (sb->sb_rptr < sb->sb_wptr) { |
| iov[0].iov_len = sb->sb_wptr - sb->sb_rptr; |
| /* Should never succeed, but... */ |
| if (iov[0].iov_len > len) iov[0].iov_len = len; |
| n = 1; |
| } else { |
| iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr; |
| if (iov[0].iov_len > len) iov[0].iov_len = len; |
| len -= iov[0].iov_len; |
| if (len) { |
| iov[1].iov_base = sb->sb_data; |
| iov[1].iov_len = sb->sb_wptr - sb->sb_data; |
| if (iov[1].iov_len > len) iov[1].iov_len = len; |
| n = 2; |
| } else |
| n = 1; |
| } |
| /* Check if there's urgent data to send, and if so, send it */ |
| |
| #ifdef HAVE_READV |
| nn = writev(so->s, (const struct iovec *)iov, n); |
| |
| DEBUG_MISC((dfd, " ... wrote nn = %d bytes\n", nn)); |
| #else |
| nn = send(so->s, iov[0].iov_base, iov[0].iov_len,0); |
| #endif |
| /* This should never happen, but people tell me it does *shrug* */ |
| if (nn < 0 && (errno == EAGAIN || errno == EINTR)) |
| return 0; |
| |
| if (nn <= 0) { |
| DEBUG_MISC((dfd, " --- sowrite disconnected, so->so_state = %x, errno = %d\n", |
| so->so_state, errno)); |
| sofcantsendmore(so); |
| tcp_sockclosed(sototcpcb(so)); |
| return -1; |
| } |
| |
| #ifndef HAVE_READV |
| if (n == 2 && nn == iov[0].iov_len) { |
| int ret; |
| ret = send(so->s, iov[1].iov_base, iov[1].iov_len,0); |
| if (ret > 0) |
| nn += ret; |
| } |
| DEBUG_MISC((dfd, " ... wrote nn = %d bytes\n", nn)); |
| #endif |
| |
| /* Update sbuf */ |
| sb->sb_cc -= nn; |
| sb->sb_rptr += nn; |
| if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen)) |
| sb->sb_rptr -= sb->sb_datalen; |
| |
| /* |
| * If in DRAIN mode, and there's no more data, set |
| * it CANTSENDMORE |
| */ |
| if ((so->so_state & SS_FWDRAIN) && sb->sb_cc == 0) |
| sofcantsendmore(so); |
| |
| return nn; |
| } |
| |
| /* |
| * recvfrom() a UDP socket |
| */ |
| void |
| sorecvfrom(so) |
| struct socket *so; |
| { |
| struct sockaddr_in addr; |
| socklen_t addrlen = sizeof(struct sockaddr_in); |
| |
| DEBUG_CALL("sorecvfrom"); |
| DEBUG_ARG("so = %lx", (long)so); |
| |
| if (so->so_type == IPPROTO_ICMP) { /* This is a "ping" reply */ |
| char buff[256]; |
| int len; |
| |
| len = recvfrom(so->s, buff, 256, 0, |
| (struct sockaddr *)&addr, &addrlen); |
| /* XXX Check if reply is "correct"? */ |
| |
| if(len == -1 || len == 0) { |
| u_char code=ICMP_UNREACH_PORT; |
| |
| if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST; |
| else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET; |
| |
| DEBUG_MISC((dfd," udp icmp rx errno = %d-%s\n", |
| errno,strerror(errno))); |
| icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno)); |
| } else { |
| icmp_reflect(so->so_m); |
| so->so_m = 0; /* Don't m_free() it again! */ |
| } |
| /* No need for this socket anymore, udp_detach it */ |
| udp_detach(so); |
| } else { /* A "normal" UDP packet */ |
| struct mbuf *m; |
| int len, n; |
| |
| if (!(m = m_get())) return; |
| m->m_data += IF_MAXLINKHDR; |
| |
| /* |
| * XXX Shouldn't FIONREAD packets destined for port 53, |
| * but I don't know the max packet size for DNS lookups |
| */ |
| len = M_FREEROOM(m); |
| /* if (so->so_fport != htons(53)) { */ |
| ioctlsocket(so->s, FIONREAD, &n); |
| |
| if (n > len) { |
| n = (m->m_data - m->m_dat) + m->m_len + n + 1; |
| m_inc(m, n); |
| len = M_FREEROOM(m); |
| } |
| /* } */ |
| |
| m->m_len = recvfrom(so->s, m->m_data, len, 0, |
| (struct sockaddr *)&addr, &addrlen); |
| DEBUG_MISC((dfd, " did recvfrom %d, errno = %d-%s\n", |
| m->m_len, errno,strerror(errno))); |
| if(m->m_len<0) { |
| u_char code=ICMP_UNREACH_PORT; |
| |
| if(errno == EHOSTUNREACH) code=ICMP_UNREACH_HOST; |
| else if(errno == ENETUNREACH) code=ICMP_UNREACH_NET; |
| |
| DEBUG_MISC((dfd," rx error, tx icmp ICMP_UNREACH:%i\n", code)); |
| icmp_error(so->so_m, ICMP_UNREACH,code, 0,strerror(errno)); |
| m_free(m); |
| } else { |
| /* |
| * Hack: domain name lookup will be used the most for UDP, |
| * and since they'll only be used once there's no need |
| * for the 4 minute (or whatever) timeout... So we time them |
| * out much quicker (10 seconds for now...) |
| */ |
| if (so->so_expire) { |
| if (so->so_fport == htons(53)) |
| so->so_expire = curtime + SO_EXPIREFAST; |
| else |
| so->so_expire = curtime + SO_EXPIRE; |
| } |
| |
| /* if (m->m_len == len) { |
| * m_inc(m, MINCSIZE); |
| * m->m_len = 0; |
| * } |
| */ |
| |
| /* |
| * If this packet was destined for CTL_ADDR, |
| * make it look like that's where it came from, done by udp_output |
| */ |
| udp_output(so, m, &addr); |
| } /* rx error */ |
| } /* if ping packet */ |
| } |
| |
| /* |
| * sendto() a socket |
| */ |
| int |
| sosendto(so, m) |
| struct socket *so; |
| struct mbuf *m; |
| { |
| int ret; |
| struct sockaddr_in addr; |
| |
| DEBUG_CALL("sosendto"); |
| DEBUG_ARG("so = %lx", (long)so); |
| DEBUG_ARG("m = %lx", (long)m); |
| |
| addr.sin_family = AF_INET; |
| if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) { |
| /* It's an alias */ |
| switch(ntohl(so->so_faddr.s_addr) & 0xff) { |
| case CTL_DNS: |
| addr.sin_addr = dns_addr; |
| break; |
| case CTL_ALIAS: |
| default: |
| addr.sin_addr = loopback_addr; |
| break; |
| } |
| } else |
| addr.sin_addr = so->so_faddr; |
| addr.sin_port = so->so_fport; |
| |
| 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))); |
| |
| /* Don't care what port we get */ |
| ret = sendto(so->s, m->m_data, m->m_len, 0, |
| (struct sockaddr *)&addr, sizeof (struct sockaddr)); |
| if (ret < 0) |
| return -1; |
| |
| /* |
| * Kill the socket if there's no reply in 4 minutes, |
| * but only if it's an expirable socket |
| */ |
| if (so->so_expire) |
| so->so_expire = curtime + SO_EXPIRE; |
| so->so_state = SS_ISFCONNECTED; /* So that it gets select()ed */ |
| return 0; |
| } |
| |
| /* |
| * XXX This should really be tcp_listen |
| */ |
| struct socket * |
| solisten(port, laddr, lport, flags) |
| u_int port; |
| u_int32_t laddr; |
| u_int lport; |
| int flags; |
| { |
| struct sockaddr_in addr; |
| struct socket *so; |
| int s, opt = 1; |
| socklen_t addrlen = sizeof(addr); |
| |
| DEBUG_CALL("solisten"); |
| DEBUG_ARG("port = %d", port); |
| DEBUG_ARG("laddr = %x", laddr); |
| DEBUG_ARG("lport = %d", lport); |
| DEBUG_ARG("flags = %x", flags); |
| |
| if ((so = socreate()) == NULL) { |
| /* free(so); Not sofree() ??? free(NULL) == NOP */ |
| return NULL; |
| } |
| |
| /* Don't tcp_attach... we don't need so_snd nor so_rcv */ |
| if ((so->so_tcpcb = tcp_newtcpcb(so)) == NULL) { |
| free(so); |
| return NULL; |
| } |
| insque(so,&tcb); |
| |
| /* |
| * SS_FACCEPTONCE sockets must time out. |
| */ |
| if (flags & SS_FACCEPTONCE) |
| so->so_tcpcb->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT*2; |
| |
| so->so_state = (SS_FACCEPTCONN|flags); |
| so->so_lport = lport; /* Kept in network format */ |
| so->so_laddr.s_addr = laddr; /* Ditto */ |
| |
| addr.sin_family = AF_INET; |
| addr.sin_addr.s_addr = INADDR_ANY; |
| addr.sin_port = port; |
| |
| if (((s = socket(AF_INET,SOCK_STREAM,0)) < 0) || |
| (setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)) < 0) || |
| (bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0) || |
| (listen(s,1) < 0)) { |
| int tmperrno = errno; /* Don't clobber the real reason we failed */ |
| |
| close(s); |
| sofree(so); |
| /* Restore the real errno */ |
| #ifdef _WIN32 |
| WSASetLastError(tmperrno); |
| #else |
| errno = tmperrno; |
| #endif |
| return NULL; |
| } |
| setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); |
| |
| getsockname(s,(struct sockaddr *)&addr,&addrlen); |
| so->so_fport = addr.sin_port; |
| if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr) |
| so->so_faddr = alias_addr; |
| else |
| so->so_faddr = addr.sin_addr; |
| |
| so->s = s; |
| return so; |
| } |
| |
| #if 0 |
| /* |
| * Data is available in so_rcv |
| * Just write() the data to the socket |
| * XXX not yet... |
| */ |
| static void |
| sorwakeup(so) |
| struct socket *so; |
| { |
| /* sowrite(so); */ |
| /* FD_CLR(so->s,&writefds); */ |
| } |
| |
| /* |
| * Data has been freed in so_snd |
| * We have room for a read() if we want to |
| * For now, don't read, it'll be done in the main loop |
| */ |
| static void |
| sowwakeup(so) |
| struct socket *so; |
| { |
| /* Nothing, yet */ |
| } |
| #endif |
| |
| /* |
| * Various session state calls |
| * XXX Should be #define's |
| * The socket state stuff needs work, these often get call 2 or 3 |
| * times each when only 1 was needed |
| */ |
| void |
| soisfconnecting(so) |
| register struct socket *so; |
| { |
| so->so_state &= ~(SS_NOFDREF|SS_ISFCONNECTED|SS_FCANTRCVMORE| |
| SS_FCANTSENDMORE|SS_FWDRAIN); |
| so->so_state |= SS_ISFCONNECTING; /* Clobber other states */ |
| } |
| |
| void |
| soisfconnected(so) |
| register struct socket *so; |
| { |
| so->so_state &= ~(SS_ISFCONNECTING|SS_FWDRAIN|SS_NOFDREF); |
| so->so_state |= SS_ISFCONNECTED; /* Clobber other states */ |
| } |
| |
| static void |
| sofcantrcvmore(struct socket *so) |
| { |
| if ((so->so_state & SS_NOFDREF) == 0) { |
| shutdown(so->s,0); |
| if(global_writefds) { |
| FD_CLR(so->s,global_writefds); |
| } |
| } |
| so->so_state &= ~(SS_ISFCONNECTING); |
| if (so->so_state & SS_FCANTSENDMORE) |
| so->so_state = SS_NOFDREF; /* Don't select it */ /* XXX close() here as well? */ |
| else |
| so->so_state |= SS_FCANTRCVMORE; |
| } |
| |
| static void |
| sofcantsendmore(struct socket *so) |
| { |
| if ((so->so_state & SS_NOFDREF) == 0) { |
| shutdown(so->s,1); /* send FIN to fhost */ |
| if (global_readfds) { |
| FD_CLR(so->s,global_readfds); |
| } |
| if (global_xfds) { |
| FD_CLR(so->s,global_xfds); |
| } |
| } |
| so->so_state &= ~(SS_ISFCONNECTING); |
| if (so->so_state & SS_FCANTRCVMORE) |
| so->so_state = SS_NOFDREF; /* as above */ |
| else |
| so->so_state |= SS_FCANTSENDMORE; |
| } |
| |
| void |
| soisfdisconnected(so) |
| struct socket *so; |
| { |
| /* so->so_state &= ~(SS_ISFCONNECTING|SS_ISFCONNECTED); */ |
| /* close(so->s); */ |
| /* so->so_state = SS_ISFDISCONNECTED; */ |
| /* |
| * XXX Do nothing ... ? |
| */ |
| } |
| |
| /* |
| * Set write drain mode |
| * Set CANTSENDMORE once all data has been write()n |
| */ |
| void |
| sofwdrain(so) |
| struct socket *so; |
| { |
| if (so->so_rcv.sb_cc) |
| so->so_state |= SS_FWDRAIN; |
| else |
| sofcantsendmore(so); |
| } |
| |