utils: Add useful function for later use

Signed-off-by: David Goulet <[email protected]>

src/common/utils.c

@@ -366,3 +366,31 @@ int utils_get_port_from_addr(const struct sockaddr *sa)
 
 	return port;
 }
+
+/*
+ * For a given sockaddr, return a const pointer to the address data structure.
+ * Return NULL if family is not IPv4 or IPv6.
+ */
+ATTR_HIDDEN
+const char *utils_get_addr_from_sockaddr(const struct sockaddr *sa)
+{
+  static char buf[256];
+  const void *addrp;
+
+  assert(sa);
+
+  memset(buf, 0, sizeof(buf));
+
+  if (sa->sa_family == AF_INET) {
+    addrp = &((const struct sockaddr_in *) sa)->sin_addr;
+  } else if (sa->sa_family == AF_INET6) {
+    addrp = &((const struct sockaddr_in6 *) sa)->sin6_addr;
+  } else {
+    goto end;
+  }
+
+  inet_ntop(sa->sa_family, addrp, buf, sizeof(buf));
+
+end:
+  return buf;
+}

src/common/utils.h

@@ -1,7 +1,7 @@
 /*
- * Copyright (C) 2000-2008 - Shaun Clowes <[email protected]> 
- * 				 2008-2011 - Robert Hogan <[email protected]>
- * 				 	  2013 - David Goulet <[email protected]>
+ * Copyright (C) 2000-2008 - Shaun Clowes <[email protected]>
+ *               2008-2011 - Robert Hogan <[email protected]>
+ *               2013 - David Goulet <[email protected]>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License, version 2 only, as
@@ -34,5 +34,6 @@ int utils_sockaddr_is_localhost(const struct sockaddr *sa);
 int utils_localhost_resolve(const char *name, int af, void *buf, size_t len);
 int utils_is_addr_any(const struct sockaddr *sa);
 int utils_get_port_from_addr(const struct sockaddr *sa);
+const char *utils_get_addr_from_sockaddr(const struct sockaddr *sa);
 
 #endif /* TORSOCKS_UTILS_H */