Major hostip.c cleanup and split into multiple files and easier #ifdef

usage.

1 files changed, 189 insertions, 0 deletions

diff --git a/lib/inet_ntop.c b/lib/inet_ntop.c
new file mode 100644
index 000000000..22c053e17
--- /dev/null
+++ b/lib/inet_ntop.c
@@ -0,0 +1,189 @@
+/*
+ * Original code by Paul Vixie. "curlified" by Gisle Vanem.
+ */
+
+#include "setup.h"
+
+#ifndef HAVE_INET_NTOP
+
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+#include <string.h>
+#include <errno.h>
+
+#include "inet_ntop.h"
+
+#define	IN6ADDRSZ	16
+#define	INADDRSZ	 4
+#define	INT16SZ		 2
+
+#ifdef WIN32
+#define EAFNOSUPPORT    WSAEAFNOSUPPORT
+#define SET_ERRNO(e)    WSASetLastError(errno = (e))
+#else
+#define SET_ERRNO(e)    errno = e
+#endif
+
+/*
+ * Format an IPv4 address, more or less like inet_ntoa().
+ *
+ * Returns `dst' (as a const)
+ * Note:
+ *  - uses no statics
+ *  - takes a u_char* not an in_addr as input
+ */
+static const char *inet_ntop4 (const u_char *src, char *dst, size_t size)
+{
+#ifdef HAVE_INET_NTOA_R
+  return inet_ntoa_r(*(struct in_addr*)src, dst, size);
+#else
+  const char *addr = inet_ntoa(*(struct in_addr*)src);
+
+  if (strlen(addr) >= size)
+  {
+    SET_ERRNO(ENOSPC);
+    return (NULL);
+  }
+  return strcpy(dst, addr);
+#endif
+}
+
+#ifdef ENABLE_IPV6
+/*
+ * Convert IPv6 binary address into presentation (printable) format.
+ */
+static const char *inet_ntop6 (const u_char *src, char *dst, size_t size)
+{
+  /*
+   * Note that int32_t and int16_t need only be "at least" large enough
+   * to contain a value of the specified size.  On some systems, like
+   * Crays, there is no such thing as an integer variable with 16 bits.
+   * Keep this in mind if you think this function should have been coded
+   * to use pointer overlays.  All the world's not a VAX.
+   */
+  char  tmp [sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")];
+  char *tp;
+  struct {
+    long base;
+    long len;
+  } best, cur;
+  u_long words [IN6ADDRSZ / INT16SZ];
+  int    i;
+
+  /* Preprocess:
+   *  Copy the input (bytewise) array into a wordwise array.
+   *  Find the longest run of 0x00's in src[] for :: shorthanding.
+   */
+  memset(words, 0, sizeof(words));
+  for (i = 0; i < IN6ADDRSZ; i++)
+      words[i/2] |= (src[i] << ((1 - (i % 2)) << 3));
+
+  best.base = -1;
+  cur.base  = -1;
+  for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++)
+  {
+    if (words[i] == 0)
+    {
+      if (cur.base == -1)
+        cur.base = i, cur.len = 1;
+      else
+        cur.len++;
+    }
+    else if (cur.base != -1)
+    {
+      if (best.base == -1 || cur.len > best.len)
+         best = cur;
+      cur.base = -1;
+    }
+  }
+  if ((cur.base != -1) && (best.base == -1 || cur.len > best.len))
+     best = cur;
+  if (best.base != -1 && best.len < 2)
+     best.base = -1;
+
+  /* Format the result.
+   */
+  tp = tmp;
+  for (i = 0; i < (IN6ADDRSZ / INT16SZ); i++)
+  {
+    /* Are we inside the best run of 0x00's?
+     */
+    if (best.base != -1 && i >= best.base && i < (best.base + best.len))
+    {
+      if (i == best.base)
+         *tp++ = ':';
+      continue;
+    }
+
+    /* Are we following an initial run of 0x00s or any real hex?
+     */
+    if (i != 0)
+       *tp++ = ':';
+
+    /* Is this address an encapsulated IPv4?
+     */
+    if (i == 6 && best.base == 0 &&
+        (best.len == 6 || (best.len == 5 && words[5] == 0xffff)))
+    {
+      if (!inet_ntop4(src+12, tp, sizeof(tmp) - (tp - tmp)))
+      {
+        SET_ERRNO(ENOSPC);
+        return (NULL);
+      }
+      tp += strlen(tp);
+      break;
+    }
+    tp += sprintf (tp, "%lx", words[i]);
+  }
+
+  /* Was it a trailing run of 0x00's?
+   */
+  if (best.base != -1 && (best.base + best.len) == (IN6ADDRSZ / INT16SZ))
+     *tp++ = ':';
+  *tp++ = '\0';
+
+  /* Check for overflow, copy, and we're done.
+   */
+  if ((size_t)(tp - tmp) > size)
+  {
+    SET_ERRNO(ENOSPC);
+    return (NULL);
+  }
+  return strcpy (dst, tmp);
+}
+#endif  /* ENABLE_IPV6 */
+
+/*
+ * Convert a network format address to presentation format.
+ *
+ * Returns pointer to presentation format address (`dst'),
+ * Returns NULL on error (see errno).
+ */
+const char *Curl_inet_ntop(int af, const void *src, char *buf, size_t size)
+{
+  switch (af) {
+  case AF_INET:
+    return inet_ntop4((const u_char*)src, buf, size);
+#ifdef ENABLE_IPV6
+  case AF_INET6:
+    return inet_ntop6((const u_char*)src, buf, size);
+#endif
+  default:
+    SET_ERRNO(EAFNOSUPPORT);
+    return NULL;
+  }
+}
+#endif  /* HAVE_INET_NTOP */