Support handing off socket write permission to external code.

[free-sw/xcb/libxcb] / src / xcb_util.c

diff --git a/src/xcb_util.c b/src/xcb_util.c
index c6c5189..7c6a4dd 100644 (file)
--- a/src/xcb_util.c
+++ b/src/xcb_util.c
@@ -38,6 +38,7 @@
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <stddef.h>
 #include <unistd.h>
 #include <string.h>
 
@@ -123,6 +124,9 @@ static int _xcb_open_unix(char *protocol, const char *file);
 #ifdef DNETCONN
 static int _xcb_open_decnet(const char *host, char *protocol, const unsigned short port);
 #endif
+#ifdef HAVE_ABSTRACT_SOCKETS
+static int _xcb_open_abstract(char *protocol, const char *file);
+#endif
 
 static int _xcb_open(char *host, char *protocol, const int display)
 {
@@ -156,10 +160,13 @@ static int _xcb_open(char *host, char *protocol, const int display)
 
     /* display specifies Unix socket */
     snprintf(file, sizeof(file), "%s%d", base, display);
-    return  _xcb_open_unix(protocol, file);
+#ifdef HAVE_ABSTRACT_SOCKETS
+    fd = _xcb_open_abstract(protocol, file);
+    if (fd >= 0 || (errno != ENOENT && errno != ECONNREFUSED))
+        return fd;
 
-
-    return fd;
+#endif
+    return  _xcb_open_unix(protocol, file);
 }
 
 #ifdef DNETCONN
@@ -192,8 +199,10 @@ static int _xcb_open_decnet(const char *host, const char *protocol, const unsign
     accessdata.acc_accl = strlen((char *)accessdata.acc_acc);
     setsockopt(fd, DNPROTO_NSP, SO_CONACCESS, &accessdata, sizeof(accessdata));
 
-    if(connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1)
+    if(connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1) {
+        close(fd);
         return -1;
+    }
     return fd;
 }
 #endif
@@ -238,9 +247,12 @@ static int _xcb_open_tcp(char *host, char *protocol, const unsigned short port)
     for(addr = results; addr; addr = addr->ai_next)
     {
         fd = socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
-        if(fd >= 0 && connect(fd, addr->ai_addr, addr->ai_addrlen) >= 0)
-            break;
-        fd = -1;
+        if(fd >= 0) {
+            if (connect(fd, addr->ai_addr, addr->ai_addrlen) >= 0)
+                break;
+            close(fd);
+            fd = -1;
+        }
     }
     freeaddrinfo(results);
     return fd;
@@ -262,10 +274,39 @@ static int _xcb_open_unix(char *protocol, const char *file)
     fd = socket(AF_UNIX, SOCK_STREAM, 0);
     if(fd == -1)
         return -1;
-    if(connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1)
+    if(connect(fd, (struct sockaddr *) &addr, sizeof(addr)) == -1) {
+        close(fd);
+        return -1;
+    }
+    return fd;
+}
+
+#ifdef HAVE_ABSTRACT_SOCKETS
+static int _xcb_open_abstract(char *protocol, const char *file)
+{
+    int fd;
+    struct sockaddr_un addr = {0};
+    socklen_t namelen;
+
+    if (protocol && strcmp("unix",protocol))
+        return -1;
+
+    strcpy(addr.sun_path + 1, file);
+    addr.sun_family = AF_UNIX;
+    namelen = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(file);
+#ifdef HAVE_SOCKADDR_SUN_LEN
+    addr.sun_len = 1 + strlen(file);
+#endif
+    fd = socket(AF_UNIX, SOCK_STREAM, 0);
+    if (fd == -1)
         return -1;
+    if (connect(fd, (struct sockaddr *) &addr, namelen) == -1) {
+        close(fd);
+        return -1;
+    }
     return fd;
 }
+#endif
 
 xcb_connection_t *xcb_connect(const char *displayname, int *screenp)
 {