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authorDaniel Stenberg <daniel@haxx.se>2004-04-26 07:20:11 +0000
committerDaniel Stenberg <daniel@haxx.se>2004-04-26 07:20:11 +0000
commit648e82f05d8bce097f9f81b78d9df40f647f6170 (patch)
tree3853fbb58d25240561337356c5a99e44ffd57a72 /lib/inet_ntop.c
parent1dbe60b8b71c2308fab987f5b4c6c6e9a264dd66 (diff)
downloadcurl-648e82f05d8bce097f9f81b78d9df40f647f6170.tar.gz
Major hostip.c cleanup and split into multiple files and easier #ifdef
usage.
Diffstat (limited to 'lib/inet_ntop.c')
-rw-r--r--lib/inet_ntop.c189
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 */