X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=lib%2Fsocket.c;h=83ca50e1765ad365a6f67650edcb01119a133bea;hb=f816bf4c7641071d83ed2c796c93ce0ddba9b3b4;hp=d93acd80b717c9f4be0fab8168862bab3bdf6dbc;hpb=83aa785d927875e69ca4afd58fb53ffc84f24413;p=deb_libnfs.git

diff --git a/lib/socket.c b/lib/socket.c
index d93acd8..83ca50e 100644
--- a/lib/socket.c
+++ b/lib/socket.c
@@ -25,31 +25,15 @@
 #include <netdb.h>
 #endif/*WIN32*/
 
-#if defined(WIN32)
-#include <winsock2.h>
-#include <ws2tcpip.h>
-#include <basetsd.h>
-#define ssize_t SSIZE_T
-#define MSG_DONTWAIT 0
-#else
-#include <unistd.h>
-#include <poll.h>
-#include <arpa/inet.h>
-#include <sys/ioctl.h>
-#include <sys/socket.h>
-#include <netdb.h>
-#endif
-
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 #include <stdio.h>
 #include <stdlib.h>
+#include <assert.h>
 #include <fcntl.h>
 #include <string.h>
 #include <errno.h>
-#include <rpc/rpc.h>
-#include <rpc/xdr.h>
 #ifdef HAVE_SYS_FILIO_H
 #include <sys/filio.h>
 #endif
@@ -57,12 +41,20 @@
 #include <sys/sockio.h>
 #endif
 #include <sys/types.h>
+#include "libnfs-zdr.h"
 #include "libnfs.h"
 #include "libnfs-raw.h"
 #include "libnfs-private.h"
 #include "slist.h"
 
-static int rpc_disconnect_requeue(struct rpc_context *rpc);
+#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)
 {
@@ -78,12 +70,18 @@ static void set_nonblocking(int fd)
 
 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 */
@@ -98,18 +96,17 @@ 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) {
-		return -1;
-	}
 	if (rpc->fd == -1) {
 		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;
 
@@ -142,7 +139,11 @@ static int rpc_read_from_socket(struct rpc_context *rpc)
 	int available;
 	int size;
 	int pdu_size;
-	ssize_t count;
+	int32_t count;
+
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
 
 #if defined(WIN32)
 	if (ioctlsocket(rpc->fd, FIONREAD, &available) != 0) {
@@ -266,8 +267,14 @@ 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,
@@ -282,12 +289,16 @@ 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) {
 		rpc_set_error(rpc, "Socket failed with POLLHUP");
-		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;
 	}
 
@@ -303,19 +314,23 @@ int rpc_service(struct rpc_context *rpc, int revents)
 			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 & POLLIN) {
 		if (rpc_read_from_socket(rpc) != 0) {
-		  	rpc_disconnect_requeue(rpc);
+		  	rpc_reconnect_requeue(rpc);
 			return 0;
 		}
 	}
@@ -330,13 +345,104 @@ int rpc_service(struct rpc_context *rpc, int revents)
 	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 = portOfs, port, rc;
+
+		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");
 		return -1;
@@ -347,6 +453,8 @@ int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc
 		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) {
@@ -354,40 +462,31 @@ int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc
 		return -1;
 	}
 
-	switch (s.ss_family) {
+
+	switch (rpc->s.ss_family) {
 	case AF_INET:
-		socksize = sizeof(struct sockaddr_in);
 #ifdef HAVE_SOCKADDR_LEN
-		sin->sin_len = socksize;
+		sin->sin_len = sizeof(struct sockaddr_in);
 #endif
-		rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 		break;
 	}
 
-	if (rpc->fd == -1) {
-		rpc_set_error(rpc, "Failed to open socket");
-		return -1;
-	}
-
 	rpc->connect_cb  = cb;
 	rpc->connect_data = private_data;
 
-	set_nonblocking(rpc->fd);
-#if defined(WIN32)
-	if (connect(rpc->fd, (struct sockaddr *)&s, socksize) == 0 && GetLastError() != WSAEINPROGRESS   )
-#else
-	if (connect(rpc->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS) 
-#endif
-	{
-		rpc_set_error(rpc, "connect() to server failed");
+	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) {
 #if defined(WIN32)
 		closesocket(rpc->fd);
@@ -404,11 +503,26 @@ int rpc_disconnect(struct rpc_context *rpc, char *error)
 	return 0;
 }
 
-/* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue */
-static int rpc_disconnect_requeue(struct rpc_context *rpc)
+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) {
 #if defined(WIN32)
 		closesocket(rpc->fd);
@@ -426,6 +540,17 @@ static int rpc_disconnect_requeue(struct rpc_context *rpc)
 	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;
@@ -437,6 +562,8 @@ 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;
@@ -480,6 +607,8 @@ int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int i
 	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;
@@ -499,6 +628,7 @@ int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int i
 	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);
@@ -512,6 +642,8 @@ int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int i
 
 struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc)
 {
+	assert(rpc->magic == RPC_CONTEXT_MAGIC);
+
 	return (struct sockaddr *)&rpc->udp_src;
 }
 
@@ -520,6 +652,8 @@ 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++;
 	}