X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=lib%2Fsocket.c;h=733f1f4768e8a0b41c9a51a0903d73e1d08539c0;hb=bff8fe460dcf4b25071fff966d86877b30eeec90;hp=1de64b6b454a42a937bea4fb0f05008e023f46dc;hpb=912f7ad5b0228e1160f474b3ef098af5ffdc78ae;p=deb_libnfs.git

diff --git a/lib/socket.c b/lib/socket.c
index 1de64b6..733f1f4 100644
--- a/lib/socket.c
+++ b/lib/socket.c
@@ -14,36 +14,101 @@
    You should have received a copy of the GNU Lesser General Public License
    along with this program; if not, see <http://www.gnu.org/licenses/>.
 */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
-#include <stdio.h>
+#ifdef AROS
+#include "aros_compat.h"
+#endif
+
+#ifdef WIN32
+#include "win32_compat.h"
+#else
+#include <arpa/inet.h>
+#endif/*WIN32*/
+
+#ifdef HAVE_POLL_H
+#include <poll.h>
+#endif
+
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
+
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+
+#ifdef HAVE_NETDB_H
+#include <netdb.h>
+#endif
+
+#ifdef HAVE_SYS_FILIO_H
+#include <sys/filio.h>
+#endif
+
+#ifdef HAVE_SYS_SOCKIO_H
+#include <sys/sockio.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
 #include <fcntl.h>
-#include <poll.h>
 #include <string.h>
 #include <errno.h>
-#include <rpc/xdr.h>
-#include <arpa/inet.h>
-#include <sys/ioctl.h>
+#include <sys/types.h>
+#include "libnfs-zdr.h"
 #include "libnfs.h"
 #include "libnfs-raw.h"
 #include "libnfs-private.h"
 #include "slist.h"
 
+#ifdef WIN32
+//has to be included after stdlib!!
+#include "win32_errnowrapper.h"
+#endif
+
+
+static int rpc_reconnect_requeue(struct rpc_context *rpc);
+static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s);
+
 static void set_nonblocking(int fd)
 {
-	unsigned v;
+	int v = 0;
+#if defined(WIN32)
+	long nonblocking=1;
+	v = ioctl(fd, FIONBIO, &nonblocking);
+#else
 	v = fcntl(fd, F_GETFL, 0);
         fcntl(fd, F_SETFL, v | O_NONBLOCK);
+#endif //FIXME
 }
 
 int rpc_get_fd(struct rpc_context *rpc)
 {
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	return rpc->fd;
 }
 
 int rpc_which_events(struct rpc_context *rpc)
 {
-	int events = rpc->is_connected ? POLLIN : POLLOUT;
+	int events;
+
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
+	events = rpc->is_connected ? POLLIN : POLLOUT;
+
+	if (rpc->is_udp != 0) {
+		/* for udp sockets we only wait for pollin */
+		return POLLIN;
+	}
 
 	if (rpc->outqueue) {
 		events |= POLLOUT;
@@ -53,30 +118,27 @@ int rpc_which_events(struct rpc_context *rpc)
 
 static int rpc_write_to_socket(struct rpc_context *rpc)
 {
-	ssize_t count;
+	int32_t count;
+
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
 
-	if (rpc == NULL) {
-		printf("trying to write to socket for NULL context\n");
-		return -1;
-	}
 	if (rpc->fd == -1) {
-		printf("trying to write but not connected\n");
-		return -2;
+		rpc_set_error(rpc, "trying to write but not connected");
+		return -1;
 	}
 
 	while (rpc->outqueue != NULL) {
-		ssize_t total;
+		int64_t total;
 
 		total = rpc->outqueue->outdata.size;
 
-		count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written);
+		count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
 		if (count == -1) {
 			if (errno == EAGAIN || errno == EWOULDBLOCK) {
-				printf("socket would block, return from write to socket\n");
 				return 0;
 			}
-			printf("Error when writing to socket :%s(%d)\n", strerror(errno), errno);
-			return -3;
+			rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
+			return -1;
 		}
 
 		rpc->outqueue->written += count;
@@ -94,68 +156,116 @@ static int rpc_read_from_socket(struct rpc_context *rpc)
 {
 	int available;
 	int size;
-	unsigned char *buf;
-	ssize_t count;
+	int pdu_size;
+	int32_t count;
+
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
 
 	if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
 		rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
 		return -1;
 	}
+
 	if (available == 0) {
 		rpc_set_error(rpc, "Socket has been closed");
-		return -2;
-	}
-	size = rpc->insize - rpc->inpos + available;
-	buf = malloc(size);
-	if (buf == NULL) {
-		rpc_set_error(rpc, "Out of memory: failed to allocate %d bytes for input buffer. Closing socket.", size);
-		return -3;
-	}
-	if (rpc->insize > rpc->inpos) {
-		memcpy(buf, rpc->inbuf + rpc->inpos, rpc->insize - rpc->inpos);
-		rpc->insize -= rpc->inpos;
-		rpc->inpos   = 0;
+		return -1;
 	}
 
-	count = read(rpc->fd, buf + rpc->insize, available);
-	if (count == -1) {
-		if (errno == EINTR) {
+	if (rpc->is_udp) {
+		char *buf;
+		socklen_t socklen = sizeof(rpc->udp_src);
+
+		buf = malloc(available);
+		if (buf == NULL) {
+			rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
+			return -1;
+		}
+		count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
+		if (count < 0) {
+			rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
 			free(buf);
-			buf = NULL;
-			return 0;
 		}
-		rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
+		if (rpc_process_pdu(rpc, buf, count) != 0) {
+			rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
+			free(buf);
+			return -1;
+		}
 		free(buf);
-		buf = NULL;
-		return -4;
+		return 0;
 	}
 
-	if (rpc->inbuf != NULL) {
-		free(rpc->inbuf);
+	/* read record marker, 4 bytes at the beginning of every pdu */
+	if (rpc->inbuf == NULL) {
+		rpc->insize = 4;
+		rpc->inbuf = malloc(rpc->insize);
+		if (rpc->inbuf == NULL) {
+			rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
+			return -1;
+		}
 	}
-	rpc->inbuf   = (char *)buf;
-	rpc->insize += count;
+	if (rpc->inpos < 4) {
+		size = 4 - rpc->inpos;
 
-	while (1) {
-		if (rpc->insize - rpc->inpos < 4) {
-			return 0;
+		count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
+		if (count == -1) {
+			if (errno == EINTR) {
+				return 0;
+			}
+			rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
+			return -1;
 		}
-		count = rpc_get_pdu_size(rpc->inbuf + rpc->inpos);
-		if (rpc->insize + rpc->inpos < count) {
+		available  -= count;
+		rpc->inpos += count;
+	}
+
+	if (available == 0) {
+		return 0;
+	}
+
+	pdu_size = rpc_get_pdu_size(rpc->inbuf);
+	if (rpc->insize < pdu_size) {
+		unsigned char *buf;
+		
+		buf = malloc(pdu_size);
+		if (buf == NULL) {
+			rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
+			return -1;
+		}
+		memcpy(buf, rpc->inbuf, rpc->insize);
+		free(rpc->inbuf);
+		rpc->inbuf  = buf;
+		rpc->insize = rpc_get_pdu_size(rpc->inbuf);
+	}
+
+	size = available;
+	if (size > rpc->insize - rpc->inpos) {
+		size = rpc->insize - rpc->inpos;
+	}
+
+	count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
+	if (count == -1) {
+		if (errno == EINTR) {
 			return 0;
 		}
-		if (rpc_process_pdu(rpc, rpc->inbuf + rpc->inpos, count) != 0) {
+		rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
+		return -1;
+	}
+	available  -= count;
+	rpc->inpos += count;
+
+	if (rpc->inpos == rpc->insize) {
+		if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) {
 			rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
-			return -5;
-		}
-		rpc->inpos += count;
-		if (rpc->inpos == rpc->insize) {
-			free(rpc->inbuf);
-			rpc->inbuf = NULL;
-			rpc->insize = 0;
-			rpc->inpos = 0;
+			return -1;
 		}
+		free(rpc->inbuf);
+		rpc->inbuf  = NULL;
+		rpc->insize = 0;
+		rpc->inpos  = 0;
 	}
+
 	return 0;
 }
 
@@ -163,12 +273,18 @@ static int rpc_read_from_socket(struct rpc_context *rpc)
 
 int rpc_service(struct rpc_context *rpc, int revents)
 {
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (revents & POLLERR) {
+#ifdef WIN32
+		char err = 0;
+#else
 		int err = 0;
+#endif
 		socklen_t err_size = sizeof(err);
 
 		if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
-				&err, &err_size) != 0 || err != 0) {
+				(char *)&err, &err_size) != 0 || err != 0) {
 			if (err == 0) {
 				err = errno;
 			}
@@ -179,14 +295,17 @@ int rpc_service(struct rpc_context *rpc, int revents)
 			rpc_set_error(rpc, "rpc_service: POLLERR, "
 						"Unknown socket error.");
 		}
-		rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
+		if (rpc->connect_cb != NULL) {
+			rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
+		}
 		return -1;
 	}
 	if (revents & POLLHUP) {
-		printf("rpc_service: POLLHUP, socket error\n");
 		rpc_set_error(rpc, "Socket failed with POLLHUP");
-		rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
-		return -2;
+		if (rpc->connect_cb != NULL) {
+			rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
+		}
+		return -1;
 	}
 
 	if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
@@ -194,90 +313,190 @@ int rpc_service(struct rpc_context *rpc, int revents)
 		socklen_t err_size = sizeof(err);
 
 		if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
-				&err, &err_size) != 0 || err != 0) {
+				(char *)&err, &err_size) != 0 || err != 0) {
 			if (err == 0) {
 				err = errno;
 			}
 			rpc_set_error(rpc, "rpc_service: socket error "
 				  	"%s(%d) while connecting.",
 					strerror(err), err);
-			rpc->connect_cb(rpc, RPC_STATUS_ERROR,
+			if (rpc->connect_cb != NULL) {
+				rpc->connect_cb(rpc, RPC_STATUS_ERROR,
 					NULL, rpc->connect_data);
+			}
 			return -1;
 		}
 
 		rpc->is_connected = 1;
-		rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
+		if (rpc->connect_cb != NULL) {
+			rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
+		}
 		return 0;
 	}
 
-	if (revents & POLLOUT && rpc->outqueue != NULL) {
-		if (rpc_write_to_socket(rpc) != 0) {
-			printf("write to socket failed\n");
-			return -3;
+	if (revents & POLLIN) {
+		if (rpc_read_from_socket(rpc) != 0) {
+		  	rpc_reconnect_requeue(rpc);
+			return 0;
 		}
 	}
 
-	if (revents & POLLIN) {
-		if (rpc_read_from_socket(rpc) != 0) {
-			rpc_disconnect(rpc, rpc_get_error(rpc));
-			return -4;
+	if (revents & POLLOUT && rpc->outqueue != NULL) {
+		if (rpc_write_to_socket(rpc) != 0) {
+			rpc_set_error(rpc, "write to socket failed");
+			return -1;
 		}
 	}
 
 	return 0;
 }
 
+void rpc_set_autoreconnect(struct rpc_context *rpc)
+{
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
 
-int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data)
+	rpc->auto_reconnect = 1;
+}
+
+void rpc_unset_autoreconnect(struct rpc_context *rpc)
+{
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
+	rpc->auto_reconnect = 0;
+}
+
+static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s)
 {
-	struct sockaddr_storage s;
-	struct sockaddr_in *sin = (struct sockaddr_in *)&s;
 	int socksize;
 
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
+	switch (s->ss_family) {
+	case AF_INET:
+		socksize = sizeof(struct sockaddr_in);
+		rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+		break;
+	default:
+		rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
+		return -1;
+	}
+
+	if (rpc->fd == -1) {
+		rpc_set_error(rpc, "Failed to open socket");
+		return -1;
+	}
+
+	/* Some systems allow you to set capabilities on an executable
+	 * to allow the file to be executed with privilege to bind to
+	 * privileged system ports, even if the user is not root.
+	 *
+	 * Opportunistically try to bind the socket to a low numbered
+	 * system port in the hope that the user is either root or the
+	 * executable has the CAP_NET_BIND_SERVICE.
+	 *
+	 * As soon as we fail the bind() with EACCES we know we will never
+	 * be able to bind to a system port so we terminate the loop.
+	 *
+	 * On linux, use
+	 *    sudo setcap 'cap_net_bind_service=+ep' /path/executable
+	 * to make the executable able to bind to a system port.
+	 *
+	 * On Windows, there is no concept of privileged ports. Thus
+	 * binding will usually succeed.
+	 */
+	{
+		struct sockaddr_in sin;
+		static int portOfs = 0;
+		const int firstPort = 512;	/* >= 512 according to Sun docs */
+		const int portCount = IPPORT_RESERVED - firstPort;
+		int startOfs, port, rc;
+
+		if (portOfs == 0) {
+			portOfs = time(NULL) % 400;
+		}
+		startOfs = portOfs;
+		do {
+			rc = -1;
+			port = htons(firstPort + portOfs);
+			portOfs = (portOfs + 1) % portCount;
+
+			/* skip well-known ports */
+			if (!getservbyport(port, "tcp")) {
+				memset(&sin, 0, sizeof(sin));
+				sin.sin_port        = port;
+				sin.sin_family      = AF_INET;
+				sin.sin_addr.s_addr = 0;
+
+				rc = bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in));
+#if !defined(WIN32)
+				/* we got EACCES, so don't try again */
+				if (rc != 0 && errno == EACCES)
+					break;
+#endif
+			}
+		} while (rc != 0 && portOfs != startOfs);
+	}
+
+	set_nonblocking(rpc->fd);
+
+	if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
+		rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
+		return -1;
+	}		
+
+	return 0;
+}	    
+
+int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data)
+{
+	struct sockaddr_in *sin = (struct sockaddr_in *)&rpc->s;
+
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	if (rpc->fd != -1) {
 		rpc_set_error(rpc, "Trying to connect while already connected");
-		printf("%s\n", rpc->error_string);
 		return -1;
 	}
 
+	if (rpc->is_udp != 0) {
+		rpc_set_error(rpc, "Trying to connect on UDP socket");
+		return -1;
+	}
+
+	rpc->auto_reconnect = 0;
+
 	sin->sin_family = AF_INET;
 	sin->sin_port   = htons(port);
 	if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
 		rpc_set_error(rpc, "Not a valid server ip address");
-		printf("%s\n", rpc->error_string);
-		return -2;
+		return -1;
 	}
 
-	switch (s.ss_family) {
+
+	switch (rpc->s.ss_family) {
 	case AF_INET:
-		rpc->fd = socket(AF_INET, SOCK_STREAM, 0);
-		socksize = sizeof(struct sockaddr_in);
+#ifdef HAVE_SOCKADDR_LEN
+		sin->sin_len = sizeof(struct sockaddr_in);
+#endif
 		break;
 	}
 
-	if (rpc->fd == -1) {
-		rpc_set_error(rpc, "Failed to open socket");
-		printf("%s\n", rpc->error_string);
-		return -3;
-	}
-
 	rpc->connect_cb  = cb;
 	rpc->connect_data = private_data;
 
-	set_nonblocking(rpc->fd);
-
-	if (connect(rpc->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS) {
-		rpc_set_error(rpc, "connect() to server failed");
-		printf("%s\n", rpc->error_string);
-		return -4;
-	}		
+	if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
+		return -1;
+	}
 
 	return 0;
 }	    
 
 int rpc_disconnect(struct rpc_context *rpc, char *error)
 {
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
+	rpc_unset_autoreconnect(rpc);
+
 	if (rpc->fd != -1) {
 		close(rpc->fd);
 	}
@@ -289,3 +508,159 @@ int rpc_disconnect(struct rpc_context *rpc, char *error)
 
 	return 0;
 }
+
+static void reconnect_cb(struct rpc_context *rpc, int status, void *data _U_, void *private_data)
+{
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
+	if (status != RPC_STATUS_SUCCESS) {
+		rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
+		return;
+	}
+
+	rpc->is_connected = 1;
+	rpc->connect_cb   = NULL;
+}
+
+/* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
+static int rpc_reconnect_requeue(struct rpc_context *rpc)
+{
+	struct rpc_pdu *pdu;
+
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
+	if (rpc->fd != -1) {
+		close(rpc->fd);
+	}
+	rpc->fd  = -1;
+
+	rpc->is_connected = 0;
+
+	/* socket is closed so we will not get any replies to any commands
+	 * in flight. Move them all over from the waitpdu queue back to the out queue
+	 */
+	for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
+		SLIST_REMOVE(&rpc->waitpdu, pdu);
+		SLIST_ADD(&rpc->outqueue, pdu);
+		/* we have to re-send the whole pdu again */
+		pdu->written = 0;
+	}
+
+	if (rpc->auto_reconnect != 0) {
+		rpc->connect_cb  = reconnect_cb;
+
+		if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
+			rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+
+int rpc_bind_udp(struct rpc_context *rpc, char *addr, int port)
+{
+	struct addrinfo *ai = NULL;
+	char service[6];
+
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
+	if (rpc->is_udp == 0) {
+		rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
+		return -1;
+	}
+
+	sprintf(service, "%d", port);
+	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
+		rpc_set_error(rpc, "Invalid address:%s. "
+			"Can not resolv into IPv4/v6 structure.");
+		return -1;
+ 	}
+
+	switch(ai->ai_family) {
+	case AF_INET:
+		rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
+		if (rpc->fd == -1) {
+			rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno)); 
+			freeaddrinfo(ai);
+			return -1;
+		}
+
+		if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
+			rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno)); 
+			freeaddrinfo(ai);
+			return -1;
+		}
+		break;
+	default:
+		rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
+		freeaddrinfo(ai);
+		return -1;
+	}
+
+	freeaddrinfo(ai);
+
+	return 0;
+}
+
+int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int is_broadcast)
+{
+	struct addrinfo *ai = NULL;
+	char service[6];
+
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
+	if (rpc->is_udp == 0) {
+		rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
+		return -1;
+	}
+
+	sprintf(service, "%d", port);
+	if (getaddrinfo(addr, service, NULL, &ai) != 0) {
+		rpc_set_error(rpc, "Invalid address:%s. "
+			"Can not resolv into IPv4/v6 structure.");
+		return -1;
+ 	}
+
+	if (rpc->udp_dest) {
+		free(rpc->udp_dest);
+		rpc->udp_dest = NULL;
+	}
+	rpc->udp_dest = malloc(ai->ai_addrlen);
+	if (rpc->udp_dest == NULL) {
+		rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
+		freeaddrinfo(ai);
+		return -1;
+	}
+	memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
+	freeaddrinfo(ai);
+
+	rpc->is_broadcast = is_broadcast;
+	setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
+
+	return 0;
+}
+
+struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc)
+{
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
+	return (struct sockaddr *)&rpc->udp_src;
+}
+
+int rpc_queue_length(struct rpc_context *rpc)
+{
+	int i=0;
+	struct rpc_pdu *pdu;
+
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
+	for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
+		i++;
+	}
+	for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
+		i++;
+	}
+	return i;
+}