X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=net.c;h=1369498905faa4ab729bac8209a6a03e8b920063;hp=c28cf0964b0468bc9e616dc2c014536bc84e2ad0;hb=0b6e7a20c19d642f9d8e65683e1525c91dd3de39;hpb=6b291ea777418071bb21c20aa7804447d95422bc

diff --git a/net.c b/net.c
index c28cf096..13694989 100644
--- a/net.c
+++ b/net.c
@@ -6,11 +6,7 @@
 
 /** \file net.c Networking-related helper functions. */
 
-/*
- * Since glibc 2.8, the _GNU_SOURCE feature test macro must be defined in order
- * to obtain the definition of the ucred structure.
- */
-#define _GNU_SOURCE
+#include "para.h"
 
 #include <netinet/in.h>
 #include <arpa/inet.h>
@@ -32,7 +28,6 @@
 
 #include <regex.h>
 
-#include "para.h"
 #include "error.h"
 #include "net.h"
 #include "string.h"
@@ -180,8 +175,7 @@ char *parse_url(const char *url,
 	}
 
 	if (*o == ':')
-		if (para_atoi32(++o, port) < 0 ||
-		    *port < 0 || *port > 0xffff)
+		if (para_atoi32(++o, port) < 0 || *port < 0 || *port > 0xffff)
 			goto failed;
 	if (host_string_ok(host))
 		return host;
@@ -192,6 +186,7 @@ failed:
 
 /**
  * Stringify port number, resolve into service name where defined.
+ *
  * \param port 2-byte port number, in host-byte-order.
  * \param transport Transport protocol name (e.g. "udp", "tcp"), or NULL.
  * \return Pointer to static result buffer.
@@ -834,51 +829,66 @@ int dccp_available_ccids(uint8_t **ccid_array)
  * \return Positive on success, \p -E_NAME_TOO_LONG if \a name is longer
  * than \p UNIX_PATH_MAX.
  */
-static int init_unix_addr(struct sockaddr_un *u, const char *name)
+static int init_unix_addr(struct sockaddr_un *u, const char *name,
+		bool abstract)
 {
-	if (strlen(name) >= UNIX_PATH_MAX)
+	if (strlen(name) + abstract >= UNIX_PATH_MAX)
 		return -E_NAME_TOO_LONG;
 	memset(u->sun_path, 0, UNIX_PATH_MAX);
 	u->sun_family = PF_UNIX;
-	strcpy(u->sun_path, name);
+	strcpy(u->sun_path + abstract, name);
 	return 1;
 }
 
 /**
- * Prepare, create, and bind a socket for local communication.
+ * Create a socket for local communication and listen on it.
  *
  * \param name The socket pathname.
  * \param mode The desired permissions of the socket.
  *
- * This function creates a local socket for sequenced, reliable,
- * two-way, connection-based byte streams.
+ * This function creates a passive local socket for sequenced, reliable,
+ * two-way, connection-based byte streams. The socket file descriptor is set to
+ * nonblocking mode and listen(2) is called to prepare the socket for
+ * accepting incoming connection requests.
+ *
+ * If mode is zero, an abstract socket (a non-portable Linux extension) is
+ * created. In this case the socket name has no connection with filesystem
+ * pathnames.
  *
- * \return The file descriptor, on success, negative on errors.
+ * \return The file descriptor on success, negative error code on failure.
  *
- * \sa socket(2)
- * \sa bind(2)
- * \sa chmod(2)
+ * \sa socket(2), \sa bind(2), \sa chmod(2), listen(2), unix(7).
  */
 int create_local_socket(const char *name, mode_t mode)
 {
 	struct sockaddr_un unix_addr;
 	int fd, ret;
+	bool abstract = mode == 0;
 
-	ret = init_unix_addr(&unix_addr, name);
+	ret = init_unix_addr(&unix_addr, name, abstract);
 	if (ret < 0)
 		return ret;
 	ret = socket(PF_UNIX, SOCK_STREAM, 0);
 	if (ret < 0)
 		return -ERRNO_TO_PARA_ERROR(errno);
 	fd = ret;
-	ret = bind(fd, (struct sockaddr *)&unix_addr, UNIX_PATH_MAX);
+	ret = mark_fd_nonblocking(fd);
+	if (ret < 0)
+		goto err;
+	ret = bind(fd, (struct sockaddr *)&unix_addr, sizeof(unix_addr));
 	if (ret < 0) {
 		ret = -ERRNO_TO_PARA_ERROR(errno);
 		goto err;
 	}
-	ret = -E_CHMOD;
-	if (chmod(name, mode) < 0)
+	if (!abstract) {
+		ret = -E_CHMOD;
+		if (chmod(name, mode) < 0)
+			goto err;
+	}
+	if (listen(fd , 5) < 0) {
+		ret = -ERRNO_TO_PARA_ERROR(errno);
 		goto err;
+	}
 	return fd;
 err:
 	close(fd);
@@ -904,17 +914,22 @@ int connect_local_socket(const char *name)
 	int fd, ret;
 
 	PARA_DEBUG_LOG("connecting to %s\n", name);
-	ret = init_unix_addr(&unix_addr, name);
-	if (ret < 0)
-		return ret;
 	fd = socket(PF_UNIX, SOCK_STREAM, 0);
 	if (fd < 0)
 		return -ERRNO_TO_PARA_ERROR(errno);
-	if (connect(fd, (struct sockaddr *)&unix_addr, sizeof(unix_addr)) == -1) {
-		ret = -ERRNO_TO_PARA_ERROR(errno);
+	/* first try (linux-only) abstract socket */
+	ret = init_unix_addr(&unix_addr, name, true);
+	if (ret < 0)
 		goto err;
-	}
-	return fd;
+	if (connect(fd, (struct sockaddr *)&unix_addr, sizeof(unix_addr)) != -1)
+		return fd;
+	/* next try pathname socket */
+	ret = init_unix_addr(&unix_addr, name, false);
+	if (ret < 0)
+		goto err;
+	if (connect(fd, (struct sockaddr *)&unix_addr, sizeof(unix_addr)) != -1)
+		return fd;
+	ret = -ERRNO_TO_PARA_ERROR(errno);
 err:
 	close(fd);
 	return ret;
@@ -998,7 +1013,7 @@ static void dispose_fds(int *fds, unsigned num)
  */
 int recv_cred_buffer(int fd, char *buf, size_t size)
 {
-	char control[255];
+	char control[255] __a_aligned(8);
 	struct msghdr msg;
 	struct cmsghdr *cmsg;
 	struct iovec iov;