X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=utcp.c;h=5938ea5bcea6af1a99b9d2e885b8fd68bdf70435;hb=3bc564058072a79a22320f8c5bc50e8844896114;hp=b939dc8a0e5e4f6723ea2eaa6f1b610adc1ecfee;hpb=850542e9585f716985c25d5995ba5bcb2cc6ba87;p=utcp

diff --git a/utcp.c b/utcp.c
index b939dc8..5938ea5 100644
--- a/utcp.c
+++ b/utcp.c
@@ -580,12 +580,12 @@ ssize_t utcp_send(struct utcp_connection *c, const void *data, size_t len) {
 	switch(c->state) {
 	case CLOSED:
 	case LISTEN:
-	case SYN_SENT:
-	case SYN_RECEIVED:
 		debug("Error: send() called on unconnected connection %p\n", c);
 		errno = ENOTCONN;
 		return -1;
 
+	case SYN_SENT:
+	case SYN_RECEIVED:
 	case ESTABLISHED:
 	case CLOSE_WAIT:
 		break;
@@ -611,6 +611,20 @@ ssize_t utcp_send(struct utcp_connection *c, const void *data, size_t len) {
 		return -1;
 	}
 
+	// Check if we need to be able to buffer all data
+
+	if(c->flags & UTCP_NO_PARTIAL) {
+		if(len > buffer_free(&c->sndbuf)) {
+			if(len > c->sndbuf.maxsize) {
+				errno = EMSGSIZE;
+				return -1;
+			} else {
+				errno = EWOULDBLOCK;
+				return 0;
+			}
+		}
+	}
+
 	// Add data to send buffer.
 
 	len = buffer_put(&c->sndbuf, data, len);
@@ -621,6 +635,13 @@ ssize_t utcp_send(struct utcp_connection *c, const void *data, size_t len) {
 	}
 
 	c->snd.last += len;
+
+	// Don't send anything yet if the connection has not fully established yet
+
+	if(c->state == SYN_SENT || c->state == SYN_RECEIVED) {
+		return len;
+	}
+
 	ack(c, false);
 
 	if(!is_reliable(c)) {
@@ -632,6 +653,11 @@ ssize_t utcp_send(struct utcp_connection *c, const void *data, size_t len) {
 		start_retransmit_timer(c);
 	}
 
+	if(is_reliable(c) && !timerisset(&c->conn_timeout)) {
+		gettimeofday(&c->conn_timeout, NULL);
+		c->conn_timeout.tv_sec += c->utcp->timeout;
+	}
+
 	return len;
 }
 
@@ -892,6 +918,8 @@ static void handle_incoming_data(struct utcp_connection *c, uint32_t seq, const
 
 
 ssize_t utcp_recv(struct utcp *utcp, const void *data, size_t len) {
+	const uint8_t *ptr = data;
+
 	if(!utcp) {
 		errno = EFAULT;
 		return -1;
@@ -919,8 +947,8 @@ ssize_t utcp_recv(struct utcp *utcp, const void *data, size_t len) {
 
 	// Make a copy from the potentially unaligned data to a struct hdr
 
-	memcpy(&hdr, data, sizeof(hdr));
-	data += sizeof(hdr);
+	memcpy(&hdr, ptr, sizeof(hdr));
+	ptr += sizeof(hdr);
 	len -= sizeof(hdr);
 
 	// Drop packets with an unknown CTL flag
@@ -952,7 +980,7 @@ ssize_t utcp_recv(struct utcp *utcp, const void *data, size_t len) {
 				return -1;
 			}
 
-			init = data;
+			init = ptr;
 			break;
 
 		default:
@@ -961,7 +989,7 @@ ssize_t utcp_recv(struct utcp *utcp, const void *data, size_t len) {
 		}
 
 		len -= auxlen;
-		data += auxlen;
+		ptr += auxlen;
 
 		if(!(aux & 0x800)) {
 			break;
@@ -972,9 +1000,9 @@ ssize_t utcp_recv(struct utcp *utcp, const void *data, size_t len) {
 			return -1;
 		}
 
-		memcpy(&aux, data, 2);
+		memcpy(&aux, ptr, 2);
 		len -= 2;
-		data += 2;
+		ptr += 2;
 	}
 
 	// Try to match the packet to an existing connection
@@ -1112,7 +1140,7 @@ ssize_t utcp_recv(struct utcp *utcp, const void *data, size_t len) {
 			acceptable = len > (size_t) - rcv_offset;
 
 			if(acceptable) {
-				data -= rcv_offset;
+				ptr -= rcv_offset;
 				len += rcv_offset;
 				hdr.seq -= rcv_offset;
 			}
@@ -1222,13 +1250,16 @@ ssize_t utcp_recv(struct utcp *utcp, const void *data, size_t len) {
 		}
 	}
 
+	uint32_t advanced;
+
 	if(!(hdr.ctl & ACK)) {
+		advanced = 0;
 		goto skip_ack;
 	}
 
 	// 3. Advance snd.una
 
-	uint32_t advanced = seqdiff(hdr.ack, c->snd.una);
+	advanced = seqdiff(hdr.ack, c->snd.una);
 	prevrcvnxt = c->rcv.nxt;
 
 	if(advanced) {
@@ -1322,12 +1353,13 @@ ssize_t utcp_recv(struct utcp *utcp, const void *data, size_t len) {
 	// 4. Update timers
 
 	if(advanced) {
-		timerclear(&c->conn_timeout); // It will be set anew in utcp_timeout() if c->snd.una != c->snd.nxt.
-
 		if(c->snd.una == c->snd.last) {
 			stop_retransmit_timer(c);
+			timerclear(&c->conn_timeout);
 		} else if(is_reliable(c)) {
 			start_retransmit_timer(c);
+			gettimeofday(&c->conn_timeout, NULL);
+			c->conn_timeout.tv_sec += utcp->timeout;
 		}
 	}
 
@@ -1345,7 +1377,14 @@ skip_ack:
 
 			c->rcv.irs = hdr.seq;
 			c->rcv.nxt = hdr.seq;
-			set_state(c, ESTABLISHED);
+
+			if(c->shut_wr) {
+				c->snd.last++;
+				set_state(c, FIN_WAIT_1);
+			} else {
+				set_state(c, ESTABLISHED);
+			}
+
 			// TODO: notify application of this somehow.
 			break;
 
@@ -1420,7 +1459,7 @@ skip_ack:
 			return 0;
 		}
 
-		handle_incoming_data(c, hdr.seq, data, len);
+		handle_incoming_data(c, hdr.seq, ptr, len);
 	}
 
 	// 7. Process FIN stuff
@@ -1533,6 +1572,13 @@ int utcp_shutdown(struct utcp_connection *c, int dir) {
 		return 0;
 	}
 
+	// Only process shutting down writes once.
+	if(c->shut_wr) {
+		return 0;
+	}
+
+	c->shut_wr = true;
+
 	switch(c->state) {
 	case CLOSED:
 	case LISTEN:
@@ -1540,7 +1586,6 @@ int utcp_shutdown(struct utcp_connection *c, int dir) {
 		return -1;
 
 	case SYN_SENT:
-		set_state(c, CLOSED);
 		return 0;
 
 	case SYN_RECEIVED:
@@ -1573,36 +1618,24 @@ int utcp_shutdown(struct utcp_connection *c, int dir) {
 	return 0;
 }
 
-int utcp_close(struct utcp_connection *c) {
-	if(utcp_shutdown(c, SHUT_RDWR) && errno != ENOTCONN) {
-		return -1;
-	}
-
-	c->recv = NULL;
-	c->poll = NULL;
-	c->reapable = true;
-	return 0;
-}
-
-int utcp_abort(struct utcp_connection *c) {
+static bool reset_connection(struct utcp_connection *c) {
 	if(!c) {
 		errno = EFAULT;
-		return -1;
+		return false;
 	}
 
 	if(c->reapable) {
 		debug("Error: abort() called on closed connection %p\n", c);
 		errno = EBADF;
-		return -1;
+		return false;
 	}
 
 	c->recv = NULL;
 	c->poll = NULL;
-	c->reapable = true;
 
 	switch(c->state) {
 	case CLOSED:
-		return 0;
+		return true;
 
 	case LISTEN:
 	case SYN_SENT:
@@ -1610,7 +1643,7 @@ int utcp_abort(struct utcp_connection *c) {
 	case LAST_ACK:
 	case TIME_WAIT:
 		set_state(c, CLOSED);
-		return 0;
+		return true;
 
 	case SYN_RECEIVED:
 	case ESTABLISHED:
@@ -1634,6 +1667,53 @@ int utcp_abort(struct utcp_connection *c) {
 
 	print_packet(c->utcp, "send", &hdr, sizeof(hdr));
 	c->utcp->send(c->utcp, &hdr, sizeof(hdr));
+	return true;
+}
+
+// Closes all the opened connections
+void utcp_abort_all_connections(struct utcp *utcp) {
+	if(!utcp) {
+		errno = EINVAL;
+		return;
+	}
+
+	for(int i = 0; i < utcp->nconnections; i++) {
+		struct utcp_connection *c = utcp->connections[i];
+
+		if(c->reapable || c->state == CLOSED) {
+			continue;
+		}
+
+		utcp_recv_t old_recv = c->recv;
+
+		reset_connection(c);
+
+		if(old_recv) {
+			errno = 0;
+			old_recv(c, NULL, 0);
+		}
+	}
+
+	return;
+}
+
+int utcp_close(struct utcp_connection *c) {
+	if(utcp_shutdown(c, SHUT_RDWR) && errno != ENOTCONN) {
+		return -1;
+	}
+
+	c->recv = NULL;
+	c->poll = NULL;
+	c->reapable = true;
+	return 0;
+}
+
+int utcp_abort(struct utcp_connection *c) {
+	if(!reset_connection(c)) {
+		return -1;
+	}
+
+	c->reapable = true;
 	return 0;
 }
 
@@ -1674,6 +1754,10 @@ struct timeval utcp_timeout(struct utcp *utcp) {
 				c->recv(c, NULL, 0);
 			}
 
+			if(c->poll) {
+				c->poll(c, 0);
+			}
+
 			continue;
 		}
 
@@ -1793,9 +1877,15 @@ void utcp_reset_timers(struct utcp *utcp) {
 	then.tv_sec += utcp->timeout;
 
 	for(int i = 0; i < utcp->nconnections; i++) {
-		utcp->connections[i]->rtrx_timeout = now;
-		utcp->connections[i]->conn_timeout = then;
-		utcp->connections[i]->rtt_start.tv_sec = 0;
+		struct utcp_connection *c = utcp->connections[i];
+
+		if(c->reapable) {
+			continue;
+		}
+
+		c->rtrx_timeout = now;
+		c->conn_timeout = then;
+		c->rtt_start.tv_sec = 0;
 	}
 
 	if(utcp->rto > START_RTO) {
@@ -1818,9 +1908,18 @@ size_t utcp_get_sndbuf(struct utcp_connection *c) {
 }
 
 size_t utcp_get_sndbuf_free(struct utcp_connection *c) {
-	if(c && (c->state == ESTABLISHED || c->state == CLOSE_WAIT)) {
+	if(!c) {
+		return 0;
+	}
+
+	switch(c->state) {
+	case SYN_SENT:
+	case SYN_RECEIVED:
+	case ESTABLISHED:
+	case CLOSE_WAIT:
 		return buffer_free(&c->sndbuf);
-	} else {
+
+	default:
 		return 0;
 	}
 }
@@ -1861,6 +1960,14 @@ void utcp_set_rcvbuf(struct utcp_connection *c, size_t size) {
 	}
 }
 
+size_t utcp_get_sendq(struct utcp_connection *c) {
+	return c->sndbuf.used;
+}
+
+size_t utcp_get_recvq(struct utcp_connection *c) {
+	return c->rcvbuf.used;
+}
+
 bool utcp_get_nodelay(struct utcp_connection *c) {
 	return c ? c->nodelay : false;
 }
@@ -1903,3 +2010,48 @@ void utcp_set_accept_cb(struct utcp *utcp, utcp_accept_t accept, utcp_pre_accept
 		utcp->pre_accept = pre_accept;
 	}
 }
+
+void utcp_expect_data(struct utcp_connection *c, bool expect) {
+	if(!c || c->reapable) {
+		return;
+	}
+
+	if(!(c->state == ESTABLISHED || c->state == FIN_WAIT_1 || c->state == FIN_WAIT_2)) {
+		return;
+	}
+
+	if(expect) {
+		// If we expect data, start the connection timer.
+		if(!timerisset(&c->conn_timeout)) {
+			gettimeofday(&c->conn_timeout, NULL);
+			c->conn_timeout.tv_sec += c->utcp->timeout;
+		}
+	} else {
+		// If we want to cancel expecting data, only clear the timer when there is no unACKed data.
+		if(c->snd.una == c->snd.last) {
+			timerclear(&c->conn_timeout);
+		}
+	}
+}
+
+void utcp_offline(struct utcp *utcp, bool offline) {
+	for(int i = 0; i < utcp->nconnections; i++) {
+		struct utcp_connection *c = utcp->connections[i];
+
+		if(!c->reapable) {
+			utcp_expect_data(c, offline);
+
+			// If we are online again, reset the retransmission timers, but keep the connection timeout as it is,
+			// to prevent peers toggling online/offline state frequently from keeping connections alive
+			// if there is no progress in sending actual data.
+			if(!offline) {
+				gettimeofday(&utcp->connections[i]->rtrx_timeout, NULL);
+				utcp->connections[i]->rtt_start.tv_sec = 0;
+			}
+		}
+	}
+
+	if(!offline && utcp->rto > START_RTO) {
+		utcp->rto = START_RTO;
+	}
+}