sws: add UNIX domain socket support

This extends sws with a --unix-socket option which causes the port to
be ignored (as the server now listens on the path specified by
--unix-socket). This feature will be available in the following patch
that enables checking for UNIX domain socket support.

Proxy support (CONNECT) is not considered nor tested. It does not make
sense anyway, first connecting through a TCP proxy, then let that TCP
proxy connect to a UNIX socket.

Signed-off-by: Peter Wu <peter@lekensteyn.nl>

1 files changed, 53 insertions, 0 deletions

diff --git a/tests/server/sws.c b/tests/server/sws.c
index ebc70d6e0..766c46a43 100644
--- a/tests/server/sws.c
+++ b/tests/server/sws.c
@@ -70,6 +70,9 @@ static enum {
 #ifdef ENABLE_IPV6
   , socket_domain_inet6 = AF_INET6
 #endif
+#ifdef USE_UNIX_SOCKETS
+  socket_domain_unix = AF_UNIX,
+#endif
 } socket_domain = AF_INET;
 static bool use_gopher = FALSE;
 static int serverlogslocked = 0;
@@ -1363,6 +1366,11 @@ static curl_socket_t connect_to(const char *ipaddr, unsigned short port)
     rc = connect(serverfd, &serveraddr.sa, sizeof(serveraddr.sa6));
     break;
 #endif /* ENABLE_IPV6 */
+#ifdef USE_UNIX_SOCKETS
+  case AF_UNIX:
+    logmsg("Proxying through UNIX socket is not (yet?) supported.");
+    return CURL_SOCKET_BAD;
+#endif /* USE_UNIX_SOCKETS */
   }
 
   if(got_exit_signal) {
@@ -1946,6 +1954,10 @@ int main(int argc, char *argv[])
   int wrotepidfile = 0;
   int flag;
   unsigned short port = DEFAULT_PORT;
+#ifdef USE_UNIX_SOCKETS
+  const char *unix_socket = NULL;
+  bool unlink_socket = false;
+#endif
   char *pidname= (char *)".http.pid";
   struct httprequest req;
   int rc;
@@ -1968,6 +1980,9 @@ int main(int argc, char *argv[])
 #ifdef ENABLE_IPV6
              "/IPv6"
 #endif
+#ifdef USE_UNIX_SOCKETS
+             "/unix"
+#endif
           );
       return 0;
     }
@@ -2000,6 +2015,23 @@ int main(int argc, char *argv[])
 #endif
       arg++;
     }
+    else if(!strcmp("--unix-socket", argv[arg])) {
+      arg++;
+      if(argc>arg) {
+#ifdef USE_UNIX_SOCKETS
+        unix_socket = argv[arg];
+        if(strlen(unix_socket) >= sizeof(me.sau.sun_path)) {
+          fprintf(stderr, "sws: socket path must be shorter than %zu chars\n",
+                  sizeof(me.sau.sun_path));
+          return 0;
+        }
+        socket_type = "unix";
+        socket_domain = AF_UNIX;
+        location_str = unix_socket;
+#endif
+        arg++;
+      }
+    }
     else if(!strcmp("--port", argv[arg])) {
       arg++;
       if(argc>arg) {
@@ -2041,6 +2073,7 @@ int main(int argc, char *argv[])
            " --pidfile [file]\n"
            " --ipv4\n"
            " --ipv6\n"
+           " --unix-socket [file]\n"
            " --port [port]\n"
            " --srcdir [path]\n"
            " --connect [ip4-addr]\n"
@@ -2104,6 +2137,14 @@ int main(int argc, char *argv[])
     rc = bind(sock, &me.sa, sizeof(me.sa6));
     break;
 #endif /* ENABLE_IPV6 */
+#ifdef USE_UNIX_SOCKETS
+  case AF_UNIX:
+    memset(&me.sau, 0, sizeof(me.sau));
+    me.sau.sun_family = AF_UNIX;
+    strncpy(me.sau.sun_path, unix_socket, sizeof(me.sau.sun_path));
+    rc = bind(sock, &me.sa, sizeof(me.sau));
+    break;
+#endif /* USE_UNIX_SOCKETS */
   }
   if(0 != rc) {
     error = SOCKERRNO;
@@ -2124,6 +2165,11 @@ int main(int argc, char *argv[])
     goto sws_cleanup;
   }
 
+#ifdef USE_UNIX_SOCKETS
+  /* listen succeeds, so let's assume a valid listening UNIX socket */
+  unlink_socket = true;
+#endif
+
   /*
   ** As soon as this server writes its pid file the test harness will
   ** attempt to connect to this server and initiate its verification.
@@ -2264,6 +2310,13 @@ sws_cleanup:
   if(sock != CURL_SOCKET_BAD)
     sclose(sock);
 
+#ifdef USE_UNIX_SOCKETS
+  if(unlink_socket && socket_domain == AF_UNIX) {
+    rc = unlink(unix_socket);
+    logmsg("unlink(%s) = %d (%s)", unix_socket, rc, strerror(rc));
+  }
+#endif
+
   if(got_exit_signal)
     logmsg("signalled to die");