1 files changed, 107 insertions, 0 deletions
diff --git a/include/ip.h b/include/ip.h
new file mode 100644
index 0000000..3f0c299
--- /dev/null
+++ b/include/ip.h
@@ -0,0 +1,107 @@
+#ifndef IP_H
+#define IP_H
+
+/*
+ *  Revision 20200603, Erwin Hoffmann
+ *  - added V46loopback address
+ *  Revision 20190414, Erwin Hoffmann
+ *  - removed ip_scan and ip_scanbracket (comp. versions).
+ *  - added ia6_fmt and ia4_fmt (for qmail)
+ *  Revision 20180314, Erwin Hoffmann
+ *  - ip4_cidr added and argument list changed (also for ip6_cidr)
+ *  Revision 20180213, Erwin Hoffmann
+ *  - ip4_scan/ip6_scan/ip4_scanbracket/ip6_fmt_flat revised
+ *  Revision 20180206, Erwin Hoffmann
+ *  - added V6linklocal address
+ *  Revision 20170319, Kai Peter
+ *  - rewrite (consolidation and compatibility)
+ *  Revision 20170210, Kai Peter
+ *  - added definition 'V4loopback' and redefinition 'ip4loopback'
+ *  Revision 20170908, Erwin Hoffmann
+ *  - added some definitions from s/qmail + required for djbdns
+*/
+
+/*  Consolidated header files ip.h from *qmail (with IPv6) and ip4.h/ip6.h
+    from libowfat. Thus it could be used with 'older' and 'newer' code.
+*/
+
+#include "byte.h"
+#include "stralloc.h"
+
+#define V4MAPPREFIX "::ffff:"
+#define HOSTNAMELEN 1025
+#define IP4MLMTU 512
+#define IP6MLMTU 1280 /* RFC 8200 */
+#define MTUSIZE IP6MLMTU
+
+#define IP4_FMT 20          /* backwards compatibility */
+#define IP6_FMT 40          /*            "            */
+#define IPFMT 72            /* used in qmail-remote only (temp?) */
+/* may be better: */
+//#define IP4_FMT IPFMT     /* backwards compatibility */
+//#define IP6_FMT IPFMT     /*            "            */
+/* deprecated: */
+#define FMT_IP4 IP4_FMT     /* more backwards compatibility */
+#define FMT_IP6 IP6_FMT     /*               "              */
+
+/* these structs are going deprecated (should replaced by socket lib) */
+struct ip4_address { unsigned char d[4]; };     /* 4 decimal pieces */
+struct ip6_address { unsigned char d[16]; };    /* 16 hex pieces */
+#define ip_address ip4_address                  /* backward compatibility */
+
+unsigned int ip4_bytestring(stralloc *,char [4],int);
+unsigned int ip4_cidr(char *,char [4],unsigned long *);
+unsigned int ip4_fmt(char *,char [4]);
+unsigned int ip4_scan(const char *,char [4]);
+unsigned int ip4_scanbracket(const char *,char [4]);
+unsigned int ia4_fmt(char *,char [4]);
+
+const static char V4loopback[4] = {127,0,0,1};
+const static char V4localnet[4] = {0,0,0,0};
+const static char V4broadcast[4] = {-1,-1,-1,-1}; // all bits 1
+
+/***
+ * Compactified IPv6 addresses are really ugly to parse.
+ * Syntax: (h = hex digit) [RFC 5952]
+ *   1. hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh:hhhh
+ *   2. leading 0s in any octet can be suppressed
+ *   3. any number of 0000 may be abbreviated as "::"
+ *      a) but only once;
+ *      b) the longest piece or on equal match the first piece,
+ *      c) a single instance of 0000 has to displayed as 0
+ *   4. The last two words may be written as IPv4 address
+ *
+ * Flat ip6 address syntax:
+ *   hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh (32 hex digits)
+ *
+ * struct ip6_address format:
+ *   cccccccccccccccc (16 chars; d[16]) -- each char swallows two hex values
+ *
+ * Bitstring representation with length prefix:
+ *   bbbbbbb.........bbbb (max 128 bits); stralloc(ip6string); b = 0 || 1
+ *
+ */
+
+unsigned int ip6_bytestring(stralloc *,char *,int);
+unsigned int ip6_cidr(char *,char [16],unsigned long *);
+unsigned int ip6_fmt(char *,char [16]);
+unsigned int ip6_fmt_flat(char *,char [16]);
+unsigned int ip6_ifscan(char *,char [16],stralloc *);
+unsigned int ip6_scan(const char *,char [16]);
+unsigned int ip6_scanbracket(const char *,char [16]);
+unsigned int ip6_scan_flat(const char *,char [16]);
+unsigned int ia6_fmt(char *,char [16]);
+
+static const unsigned char V4mappedprefix[12] = {0,0,0,0, 0,0,0,0, 0,0,0xff,0xff};
+static const unsigned char V46loopback[16] = {0,0,0,0, 0,0,0,0, 0,0,0xff,0xff, 127,0,0,1};
+static const unsigned char V6loopback[16] = {0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,1};
+static const unsigned char V6localnet[16] = {0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0};
+static const unsigned char V6linklocal[2] = {0xfe,0x80};
+
+int fromhex(unsigned char);
+char tohex(char);
+
+#define V6any V6localnet	/* backward compatibility */
+#define ip6_isv4mapped(ip) (byte_equal(ip,12,V4mappedprefix))
+
+#endif