nxcomp/Loop.cpp: Add Unix file socket support for proxy <-> proxy connection.

nxcomp/ChannelEndPoint.cpp

@@ -24,6 +24,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <sys/stat.h>
 
 #include "ChannelEndPoint.h"
 
@@ -31,8 +32,21 @@
 
 ChannelEndPoint::ChannelEndPoint(const char *spec)
   : defaultTCPPort_(0), defaultTCPInterface_(0),
-    defaultUnixPath_(NULL) {
-  spec_ = (spec ? strdup(spec) : NULL);
+    defaultUnixPath_(NULL), spec_(NULL) {
+  setSpec(spec);
+}
+
+ChannelEndPoint::~ChannelEndPoint()
+{
+  char *unixPath = NULL;
+
+  if (getUnixPath(&unixPath))
+  {
+    struct stat st;
+    lstat(unixPath, &st);
+    if(S_ISSOCK(st.st_mode))
+      unlink(unixPath);
+  }
 }
 
 void
@@ -40,21 +54,92 @@ ChannelEndPoint::setSpec(const char *spec) {
   if (spec_) free(spec_);
 
   if (spec && strlen(spec))
+  {
     spec_ = strdup(spec);
+    isUnix_ = getUnixPath();
+    isTCP_ = getTCPHostAndPort();
+  }
   else
+  {
     spec_ = NULL;
+    isUnix_ = false;
+    isTCP_ = false;
+  }
 }
 
 void
-ChannelEndPoint::setSpec(int port) {
+ChannelEndPoint::setSpec(long port) {
   if (port >= 0) {
     char tmp[20];
-    sprintf(tmp, "%d", port);
+    sprintf(tmp, "%ld", port);
     setSpec(tmp);
   }
+  else {
+    disable();
+  }
+}
+
+void
+ChannelEndPoint::setSpec(const char *hostName, long port) {
+  int length;
+
+  if (spec_) free(spec_);
+  isUnix_ = false;
+  isTCP_ = false;
+
+  if (hostName && strlen(hostName) && port >= 1)
+  {
+    length = snprintf(NULL, 0, "tcp:%s:%ld", hostName, port);
+    spec_ = (char *)calloc(length + 1, sizeof(char));
+    snprintf(spec_, length+1, "tcp:%s:%ld", hostName, port);
+    isTCP_ = true;
+  }
   else setSpec((char*)NULL);
 }
 
+bool
+ChannelEndPoint::getSpec(char **socketUri) const {
+
+  if (socketUri) *socketUri = NULL;
+
+  char *unixPath = NULL;
+  char *hostName = NULL;
+  long port = -1;
+
+  char *newSocketUri = NULL;
+  int length = -1;
+
+  if (getUnixPath(&unixPath))
+  {
+    length = snprintf(NULL, 0, "unix:%s", unixPath);
+  }
+  else if (getTCPHostAndPort(&hostName, &port))
+  {
+    length = snprintf(NULL, 0, "tcp:%s:%ld", hostName, port);
+  }
+
+  if (length > 0)
+  {
+    newSocketUri = (char *)calloc(length + 1, sizeof(char));
+    if (isUnixSocket())
+      snprintf(newSocketUri, length+1, "unix:%s", unixPath);
+    else
+      snprintf(newSocketUri, length+1, "tcp:%s:%ld", hostName, port);
+
+    if (socketUri)
+      *socketUri = strdup(newSocketUri);
+  }
+
+  free(newSocketUri);
+  free(unixPath);
+  free(hostName);
+
+  if (*socketUri != '\0')
+    return true;
+
+  return false;
+}
+
 void
 ChannelEndPoint::setDefaultTCPPort(long port) {
   defaultTCPPort_ = port;
@@ -76,10 +161,12 @@ ChannelEndPoint::setDefaultUnixPath(char *path) {
 }
 
 void
-ChannelEndPoint::disable() { setSpec("0"); }
+ChannelEndPoint::disable() {
+  setSpec("0");
+}
 
 bool
-ChannelEndPoint::specIsPort(long *port) const {
+ChannelEndPoint::getPort(long *port) const {
   if (port) *port = 0;
   long p = -1;
   if (spec_) {
@@ -101,7 +188,7 @@ ChannelEndPoint::getUnixPath(char **unixPath) const {
   long p;
   char *path = NULL;
 
-  if (specIsPort(&p)) {
+  if (getPort(&p)) {
     if (p != 1) return false;
   }
   else if (spec_ && (strncmp("unix:", spec_, 5) == 0)) {
@@ -122,6 +209,11 @@ ChannelEndPoint::getUnixPath(char **unixPath) const {
   return true;
 }
 
+bool
+ChannelEndPoint::isUnixSocket() const {
+  return isUnix_;
+}
+
 // FIXME!!!
 static const char *
 getComputerName() {
@@ -158,7 +250,7 @@ ChannelEndPoint::getTCPHostAndPort(char **host, long *port) const {
   if (host) *host = NULL;
   if (port) *port = 0;
 
-  if (specIsPort(&p)) {
+  if (getPort(&p)) {
     h_len = 0;
   }
   else if (spec_ && (strncmp("tcp:", spec_, 4) == 0)) {
@@ -194,8 +286,8 @@ ChannelEndPoint::getTCPHostAndPort(char **host, long *port) const {
 }
 
 bool
-ChannelEndPoint::enabled() const {
-  return (getUnixPath() || getTCPHostAndPort());
+ChannelEndPoint::isTCPSocket() const {
+  return isTCP_;
 }
 
 long ChannelEndPoint::getTCPPort() const {
@@ -205,8 +297,15 @@ long ChannelEndPoint::getTCPPort() const {
 }
 
 bool
+ChannelEndPoint::enabled() const {
+  return (isUnixSocket() || isTCPSocket());
+}
+
+bool
 ChannelEndPoint::validateSpec() {
-  return (specIsPort() || getUnixPath() || getTCPHostAndPort());
+  isTCP_ = getTCPHostAndPort();
+  isUnix_ = getUnixPath();
+  return ( getPort() || isUnix_ || isTCP_ );
 }
 
 ChannelEndPoint &ChannelEndPoint::operator=(const ChannelEndPoint &other) {
@@ -219,26 +318,24 @@ ChannelEndPoint &ChannelEndPoint::operator=(const ChannelEndPoint &other) {
   old = spec_;
   spec_ = (other.spec_ ? strdup(other.spec_) : NULL);
   free(old);
+  isUnix_ = getUnixPath();
+  isTCP_ = getTCPHostAndPort();
   return *this;
 }
 
 std::ostream& operator<<(std::ostream& os, const ChannelEndPoint& endPoint) {
   if (endPoint.enabled()) {
-    char *unixPath, *host;
-    long port;
-    if (endPoint.getUnixPath(&unixPath)) {
-      os << "unix:" << unixPath;
-      free(unixPath);
+    char* endPointSpec = NULL;
+    if (endPoint.getSpec(&endPointSpec))
+    {
+      os << endPointSpec;
+      free(endPointSpec);
     }
-    else if (endPoint.getTCPHostAndPort(&host, &port)) {
-      os << "tcp:" << host << ":" << port;
-      free(host);
-    }
-    else {
+    else
       os << "(invalid)";
-    }
   }
-  else {
+  else
+  {
     os << "(disabled)";
   }
   return os;

nxcomp/ChannelEndPoint.h

@@ -33,25 +33,32 @@ class ChannelEndPoint
   int defaultTCPInterface_; // 0=localhost, otherwise IP of public interface.
   char *defaultUnixPath_;
   char *spec_;
+  bool isUnix_;
+  bool isTCP_;
 
-  bool specIsPort(long *port = NULL) const;
+  bool getPort(long *port = NULL) const;
 
  public:
   ChannelEndPoint(const char *spec = NULL);
+  ~ChannelEndPoint();
   ChannelEndPoint &operator=(const ChannelEndPoint &other);
 
   bool enabled() const;
   bool disabled() { return !enabled(); }
   void disable();
   void setSpec(const char *spec);
-  void setSpec(int port);
+  void setSpec(long port);
+  void setSpec(const char *hostName, long port);
+  bool getSpec(char **socketUri) const;
   void setDefaultTCPPort(long port);
   void setDefaultTCPInterface(int publicInterface);
   void setDefaultUnixPath(char *path);
 
   bool getUnixPath(char **path = NULL) const;
+  bool isUnixSocket() const;
   bool getTCPHostAndPort(char **hostname = NULL, long *port = NULL) const;
   long getTCPPort() const;
+  bool isTCPSocket() const;
 
   bool validateSpec();
 };