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-rw-r--r--slirp/socket.c696
1 files changed, 696 insertions, 0 deletions
diff --git a/slirp/socket.c b/slirp/socket.c
new file mode 100644
index 0000000000..396fb4ac78
--- /dev/null
+++ b/slirp/socket.c
@@ -0,0 +1,696 @@
+/*
+ * 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"
+#include "main.h"
+
+void
+so_init()
+{
+ /* Nothing yet */
+}
+
+
+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;
+ 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 = read(so->s, iov[0].iov_base, iov[0].iov_len);
+#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)
+ nn += read(so->s, iov[1].iov_base, iov[1].iov_len);
+
+ 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;
+ 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 = write(so->s, iov[0].iov_base, iov[0].iov_len);
+#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)
+ nn += write(so->s, iov[1].iov_base, iov[1].iov_len);
+ 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;
+ int 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)) { */
+ ioctl(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, addrlen = sizeof(addr), opt = 1;
+
+ 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) ||
+ (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 */
+ errno = tmperrno;
+ return NULL;
+ }
+ setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
+ 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 = our_addr;
+ else
+ so->so_faddr = addr.sin_addr;
+
+ so->s = s;
+ return so;
+}
+
+/*
+ * Data is available in so_rcv
+ * Just write() the data to the socket
+ * XXX not yet...
+ */
+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
+ */
+void
+sowwakeup(so)
+ struct socket *so;
+{
+ /* Nothing, yet */
+}
+
+/*
+ * 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 */
+}
+
+void
+sofcantrcvmore(so)
+ struct socket *so;
+{
+ if ((so->so_state & SS_NOFDREF) == 0) {
+ shutdown(so->s,0);
+ 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;
+}
+
+void
+sofcantsendmore(so)
+ struct socket *so;
+{
+ if ((so->so_state & SS_NOFDREF) == 0) {
+ shutdown(so->s,1); /* send FIN to fhost */
+ FD_CLR(so->s, global_readfds);
+ 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);
+}
+
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-01 20:51:23 +0000