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|
Author: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
Description: Support abstract local sockets for Linux systems
Abstract:
Relevant code taken from xtrans 1.2.7 on 2014-06-11.
--- a/nx-X11/lib/xtrans/Xtranssock.c
+++ b/nx-X11/lib/xtrans/Xtranssock.c
@@ -172,6 +172,8 @@
sock_init();\
IBMsockInit = 1;\
}
+
+
#undef EINTR
#define EINTR SOCEINTR
#undef EINVAL
@@ -192,6 +194,10 @@
#define SocketInitOnce() /**/
#endif
+#if defined(linux)
+#define HAVE_ABSTRACT_SOCKETS
+#endif
+
#define MIN_BACKLOG 128
#ifdef SOMAXCONN
#if SOMAXCONN > MIN_BACKLOG
@@ -532,7 +538,7 @@
void TRANS(SocketRejectConnection) (XtransConnInfo ciptr)
{
- size_t sa_l = sizeof(struct sockaddr);
+ socklen_t sa_l = sizeof(struct sockaddr);
struct sockaddr sa;
fd_set fs;
struct timeval t;
@@ -914,9 +920,11 @@
struct sockaddr_in socknamev4;
void *socknamePtr;
#if defined(SVR4) || defined(__SCO__)
+# define SOCKLEN_T_PTR void*
size_t namelen;
#else
- int namelen;
+# define SOCKLEN_T_PTR socklen_t*
+ socklen_t namelen;
#endif
PRMSG (3,"SocketINETGetAddr(%p)\n", ciptr, 0, 0);
@@ -935,7 +943,7 @@
}
if (getsockname (ciptr->fd,(struct sockaddr *) socknamePtr,
- (void *)&namelen) < 0)
+ (SOCKLEN_T_PTR)&namelen) < 0)
{
#ifdef WIN32
errno = WSAGetLastError();
@@ -1477,23 +1485,28 @@
#ifdef UNIXCONN
static int
-set_sun_path(const char *port, const char *upath, char *path)
+set_sun_path(const char *port, const char *upath, char *path, int abstract)
{
struct sockaddr_un s;
int maxlen = sizeof(s.sun_path) - 1;
+ const char *at = "";
if (!port || !*port || !path)
return -1;
- if (*port == '/') { /* a full pathname */
- if (strlen(port) > maxlen)
- return -1;
- sprintf(path, "%s", port);
- } else {
- if (strlen(port) + strlen(upath) > maxlen)
- return -1;
- sprintf(path, "%s%s", upath, port);
- }
+#ifdef HAVE_ABSTRACT_SOCKETS
+ if (port[0] == '@')
+ upath = "";
+ else if (abstract)
+ at = "@";
+#endif
+
+ if (*port == '/') /* a full pathname */
+ upath = "";
+
+ if (strlen(port) + strlen(upath) > maxlen)
+ return -1;
+ snprintf(path, sizeof(s.sun_path), "%s%s%s", at, upath, port);
return 0;
}
#endif
@@ -1726,6 +1739,12 @@
int oldUmask;
int status;
unsigned int mode;
+ char tmpport[108];
+
+ int abstract = 0;
+#ifdef HAVE_ABSTRACT_SOCKETS
+ abstract = ciptr->transptr->flags & TRANS_ABSTRACT;
+#endif
PRMSG (2, "SocketUNIXCreateListener(%s)\n",
port ? port : "NULL", 0, 0);
@@ -1741,11 +1760,11 @@
mode = 0777;
#endif
#ifdef NX_TRANS_SOCKET
- if (trans_mkdir(_NXGetUnixDir(UNIX_DIR), mode) == -1) {
+ if (!abstract && trans_mkdir(_NXGetUnixDir(UNIX_DIR), mode) == -1) {
PRMSG (1, "SocketUNIXCreateListener: mkdir(%s) failed, errno = %d\n",
_NXGetUnixDir(UNIX_DIR), errno, 0);
#else
- if (trans_mkdir(UNIX_DIR, mode) == -1) {
+ if (!abstract && trans_mkdir(UNIX_DIR, mode) == -1) {
PRMSG (1, "SocketUNIXCreateListener: mkdir(%s) failed, errno = %d\n",
UNIX_DIR, errno, 0);
#endif
@@ -1754,13 +1773,18 @@
}
#endif
+ memset(&sockname, 0, sizeof(sockname));
sockname.sun_family = AF_UNIX;
+ if (!(port && *port)) {
+ snprintf (tmpport, sizeof(tmpport), "%s%ld", UNIX_PATH, (long)getpid());
+ port = tmpport;
+ }
if (port && *port) {
#ifdef NX_TRANS_SOCKET
- if (set_sun_path(port, _NXGetUnixPath(UNIX_PATH), sockname.sun_path) != 0) {
+ if (set_sun_path(port, _NXGetUnixPath(UNIX_PATH), sockname.sun_path, abstract) != 0) {
#else
- if (set_sun_path(port, UNIX_PATH, sockname.sun_path) != 0) {
+ if (set_sun_path(port, UNIX_PATH, sockname.sun_path, abstract) != 0) {
#endif
PRMSG (1, "SocketUNIXCreateListener: path too long\n", 0, 0, 0);
return TRANS_CREATE_LISTENER_FAILED;
@@ -1784,7 +1808,12 @@
fprintf(stderr, "SocketUNIXCreateListener: Unlinking path [%s] for ciptr at [%p].\n",
sockname.sun_path, (void *) ciptr);
#endif
- unlink (sockname.sun_path);
+ if (abstract) {
+ sockname.sun_path[0] = '\0';
+ namelen = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(&sockname.sun_path[1]);
+ }
+ else
+ unlink (sockname.sun_path);
if ((status = TRANS(SocketCreateListener) (ciptr,
(struct sockaddr *) &sockname, namelen, flags)) < 0)
@@ -1814,6 +1843,9 @@
return TRANS_CREATE_LISTENER_FAILED;
}
+ if (abstract)
+ sockname.sun_path[0] = '@';
+
ciptr->family = sockname.sun_family;
ciptr->addrlen = namelen;
memcpy (ciptr->addr, &sockname, ciptr->addrlen);
@@ -1823,7 +1855,6 @@
return 0;
}
-
static int
TRANS(SocketUNIXResetListener) (XtransConnInfo ciptr)
@@ -1836,15 +1867,20 @@
struct stat statb;
int status = TRANS_RESET_NOOP;
unsigned int mode;
+ int abstract = 0;
+#ifdef HAVE_ABSTRACT_SOCKETS
+ abstract = ciptr->transptr->flags & TRANS_ABSTRACT;
+#endif
PRMSG (3, "SocketUNIXResetListener(%p,%d)\n", ciptr, ciptr->fd, 0);
- if (stat (unsock->sun_path, &statb) == -1 ||
+ if (!abstract && (
+ stat (unsock->sun_path, &statb) == -1 ||
((statb.st_mode & S_IFMT) !=
#if (defined (sun) && defined(SVR4)) || defined(NCR) || defined(SCO325) || !defined(S_IFSOCK)
S_IFIFO))
#else
- S_IFSOCK))
+ S_IFSOCK)))
#endif
{
int oldUmask = umask (0);
@@ -2034,6 +2070,11 @@
}
+ /*
+ * if the socket is abstract, we already modified the address to have a
+ * @ instead of the initial NUL, so no need to do that again here.
+ */
+
newciptr->addrlen = ciptr->addrlen;
memcpy (newciptr->addr, ciptr->addr, newciptr->addrlen);
@@ -2626,6 +2667,12 @@
struct sockaddr_un sockname;
int namelen;
+
+ int abstract = 0;
+#ifdef HAVE_ABSTRACT_SOCKETS
+ abstract = ciptr->transptr->flags & TRANS_ABSTRACT;
+#endif
+
#if defined(hpux) && defined(X11_t)
struct sockaddr_un old_sockname;
int old_namelen;
@@ -2674,9 +2721,9 @@
sockname.sun_family = AF_UNIX;
#ifdef NX_TRANS_SOCKET
- if (set_sun_path(port, _NXGetUnixPath(UNIX_PATH), sockname.sun_path) != 0) {
+ if (set_sun_path(port, _NXGetUnixPath(UNIX_PATH), sockname.sun_path, abstract) != 0) {
#else
- if (set_sun_path(port, UNIX_PATH, sockname.sun_path) != 0) {
+ if (set_sun_path(port, UNIX_PATH, sockname.sun_path, abstract) != 0) {
#endif
PRMSG (1, "SocketUNIXConnect: path too long\n", 0, 0, 0);
return TRANS_CONNECT_FAILED;
@@ -2722,6 +2769,14 @@
#endif
/*
+ * Adjust the socket path if using abstract sockets.
+ * Done here because otherwise all the strlen() calls above would fail.
+ */
+
+ if (abstract)
+ sockname.sun_path[0] = '\0';
+
+ /*
* Do the connect()
*/
@@ -2757,12 +2812,18 @@
* should try again.
*/
- if (olderrno == ENOENT || olderrno == EINTR)
- return TRANS_TRY_CONNECT_AGAIN;
- else if (olderrno == EWOULDBLOCK || olderrno == EINPROGRESS)
+ if (olderrno == EWOULDBLOCK || olderrno == EINPROGRESS)
return TRANS_IN_PROGRESS;
- else
- {
+ else if (olderrno == EINTR)
+ return TRANS_TRY_CONNECT_AGAIN;
+ else if (olderrno == ENOENT || olderrno == ECONNREFUSED)
+ /* If opening as abstract failed, try again normally */
+ if (abstract) {
+ ciptr->transptr->flags &= ~(TRANS_ABSTRACT);
+ return TRANS_TRY_CONNECT_AGAIN;
+ } else {
+ return TRANS_CONNECT_FAILED;
+ } else {
PRMSG (2,"SocketUNIXConnect: Can't connect: errno = %d\n",
EGET(),0, 0);
@@ -2791,6 +2852,9 @@
return TRANS_CONNECT_FAILED;
}
+ if (abstract)
+ sockname.sun_path[0] = '@';
+
ciptr->family = AF_UNIX;
ciptr->addrlen = namelen;
ciptr->peeraddrlen = namelen;
@@ -3323,7 +3387,11 @@
Xtransport TRANS(SocketLocalFuncs) = {
/* Socket Interface */
"local",
+#ifdef HAVE_ABSTRACT_SOCKETS
+ TRANS_ABSTRACT,
+#else
0,
+#endif
#ifdef TRANS_CLIENT
TRANS(SocketOpenCOTSClient),
#endif /* TRANS_CLIENT */
@@ -3369,7 +3437,7 @@
Xtransport TRANS(SocketUNIXFuncs) = {
/* Socket Interface */
"unix",
-#if !defined(LOCALCONN)
+#if !defined(LOCALCONN) && !defined(HAVE_ABSTRACT_SOCKETS)
TRANS_ALIAS,
#else
0,
--- a/nx-X11/lib/xtrans/Xtransint.h
+++ b/nx-X11/lib/xtrans/Xtransint.h
@@ -374,9 +374,10 @@
#define TRANS_DISABLED (1<<2) /* Don't open this one */
#define TRANS_NOLISTEN (1<<3) /* Don't listen on this one */
#define TRANS_NOUNLINK (1<<4) /* Dont unlink transport endpoints */
+#define TRANS_ABSTRACT (1<<5) /* Use abstract sockets if available */
/* Flags to preserve when setting others */
-#define TRANS_KEEPFLAGS (TRANS_NOUNLINK)
+#define TRANS_KEEPFLAGS (TRANS_NOUNLINK|TRANS_ABSTRACT)
/*
* readv() and writev() don't exist or don't work correctly on some
|
