1 files changed, 52 insertions, 0 deletions
diff --git a/src/lib/net/ipv4.c b/src/lib/net/ipv4.c
new file mode 100644
index 0000000000..18e69761e2
--- /dev/null
+++ b/src/lib/net/ipv4.c
@@ -0,0 +1,52 @@
+/* Copyright (c) 2003-2004, Roger Dingledine
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+#include "orconfig.h"
+#include "lib/cc/torint.h"
+#include "lib/net/ipv4.h"
+#include "lib/string/printf.h"
+#include "lib/string/scanf.h"
+
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+#ifdef _WIN32
+#include <winsock2.h>
+#endif
+
+/** Set *addr to the IP address (in dotted-quad notation) stored in *str.
+ * Return 1 on success, 0 if *str is badly formatted.
+ * (Like inet_aton(str,addr), but works on Windows and Solaris.)
+ */
+int
+tor_inet_aton(const char *str, struct in_addr* addr)
+{
+  unsigned a,b,c,d;
+  char more;
+  if (tor_sscanf(str, "%3u.%3u.%3u.%3u%c", &a,&b,&c,&d,&more) != 4)
+    return 0;
+  if (a > 255) return 0;
+  if (b > 255) return 0;
+  if (c > 255) return 0;
+  if (d > 255) return 0;
+  addr->s_addr = htonl((a<<24) | (b<<16) | (c<<8) | d);
+  return 1;
+}
+
+/** Given an IPv4 in_addr struct *<b>in</b> (in network order, as usual),
+ *  write it as a string into the <b>buf_len</b>-byte buffer in
+ *  <b>buf</b>. Returns a non-negative integer on success.
+ *  Returns -1 on failure.
+ */
+int
+tor_inet_ntoa(const struct in_addr *in, char *buf, size_t buf_len)
+{
+  uint32_t a = ntohl(in->s_addr);
+  return tor_snprintf(buf, buf_len, "%d.%d.%d.%d",
+                      (int)(uint8_t)((a>>24)&0xff),
+                      (int)(uint8_t)((a>>16)&0xff),
+                      (int)(uint8_t)((a>>8 )&0xff),
+                      (int)(uint8_t)((a    )&0xff));
+}