lib/irc_ipv6.h

   1 /* IPv6 helper prototypes */
   2
   3 #ifndef __irc_ipv6_H
   4 #define __irc_ipv6_H
   5
   6 #include <limits.h>
   7
   8 /* from res.h */
   9
  10 /** Structure to store an IP address. */
  11 struct irc_in_addr
  12 {
  13   unsigned short in6_16[8]; /**< IPv6 encoded parts, little-endian. */
  14 };
  15
  16 /** Structure to store an IP address and port number. */
  17 struct irc_sockaddr
  18 {
  19   struct irc_in_addr addr; /**< IP address. */
  20   unsigned short port;     /**< Port number, host-endian. */
  21 };
  22
  23 #define irc_bitlen(ADDR, BITS) (irc_in_addr_is_ipv4(ADDR) ? (BITS) - 96 : (BITS))
  24
  25 /** Evaluate to non-zero if \a ADDR is a valid address (not all 0s and not all 1s). */
  26 #define irc_in_addr_valid(ADDR) (((ADDR)->in6_16[0] && ~(ADDR)->in6_16[0]) \
  27                                  || (ADDR)->in6_16[1] != (ADDR)->in6_16[0] \
  28                                  || (ADDR)->in6_16[2] != (ADDR)->in6_16[0] \
  29                                  || (ADDR)->in6_16[3] != (ADDR)->in6_16[0] \
  30                                  || (ADDR)->in6_16[4] != (ADDR)->in6_16[0] \
  31                                  || (ADDR)->in6_16[5] != (ADDR)->in6_16[0] \
  32                                  || (ADDR)->in6_16[6] != (ADDR)->in6_16[0] \
  33                                  || (ADDR)->in6_16[7] != (ADDR)->in6_16[0])
  34 /** Evaluate to non-zero if \a ADDR (of type struct irc_in_addr) is an IPv4 address. */
  35 #define irc_in_addr_is_ipv4(ADDR) (!(ADDR)->in6_16[0] && !(ADDR)->in6_16[1] && !(ADDR)->in6_16[2] \
  36                                    && !(ADDR)->in6_16[3] && !(ADDR)->in6_16[4] && ((!(ADDR)->in6_16[5] \
  37                                    && (ADDR)->in6_16[6]) || (ADDR)->in6_16[5] == 65535))
  38 /** Evaluate to non-zero if \a A is a different IP than \a B. */
  39 #define irc_in_addr_cmp(A,B) (irc_in_addr_is_ipv4(A) ? ((A)->in6_16[6] != (B)->in6_16[6] \
  40                                   || (A)->in6_16[7] != (B)->in6_16[7] || !irc_in_addr_is_ipv4(B)) \
  41                               : memcmp((A), (B), sizeof(struct irc_in_addr)))
  42 /** Evaluate to non-zero if \a ADDR is a loopback address. */
  43 #define irc_in_addr_is_loopback(ADDR) (!(ADDR)->in6_16[0] && !(ADDR)->in6_16[1] && !(ADDR)->in6_16[2] \
  44                                        && !(ADDR)->in6_16[3] && !(ADDR)->in6_16[4] \
  45                                        && ((!(ADDR)->in6_16[5] \
  46                                             && ((!(ADDR)->in6_16[6] && (ADDR)->in6_16[7] == htons(1)) \
  47                                                 || (ntohs((ADDR)->in6_16[6]) & 0xff00) == 0x7f00)) \
  48                                            || (((ADDR)->in6_16[5] == 65535) \
  49                                                && (ntohs((ADDR)->in6_16[6]) & 0xff00) == 0x7f00)))
  50
  51
  52 /* from ircd_defs.h */
  53
  54 /** Maximum length of a numeric IP (v4 or v6) address.
  55  * "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255"
  56  */
  57 #define SOCKIPLEN 45
  58
  59 #define CIDRLEN SOCKIPLEN + 4
  60
  61 /* from ircd_string.h */
  62
  63 extern const char* ircd_ntoa(const struct irc_in_addr* addr);
  64 extern const char* ircd_ntoa_r(char* buf, const struct irc_in_addr* addr);
  65 extern const char * ircd_ntoa_masked(const struct irc_in_addr* addr, unsigned char bits);
  66 extern const char* ircd_ntoa_masked_r(char* buf, const struct irc_in_addr* in, unsigned char bits);
  67 #define ircd_aton(ADDR, STR) ipmask_parse((STR), (ADDR), NULL)
  68 extern int ipmask_parse(const char *in, struct irc_in_addr *mask, unsigned char *bits_ptr);
  69 extern int ipmask_check(const struct irc_in_addr *, const struct irc_in_addr *, unsigned char);
  70 void ip_canonicalize_tunnel(struct irc_in_addr *out, const struct irc_in_addr *in);
  71
  72 #define IPtostr(ipaddr) ircd_ntoa(&(ipaddr))
  73 #define CIDRtostr(ipaddr, bits) ircd_ntoa_masked(&(ipaddr), bits)
  74 #define irc_in_addr_v4_to_int(ADDR) ((ntohs((ADDR)->in6_16[6]) << 16) | ntohs((ADDR)->in6_16[7]))
  75
  76 /* from numnicks.h */
  77
  78 extern const char* iptobase64(char* buf, const struct irc_in_addr* addr, unsigned int count, int v6_ok);
  79 extern void base64toip(const char* s, struct irc_in_addr* addr);
  80
  81 /* from ircd_chattr.h */
  82
  83 /** Array mapping characters to attribute bitmasks. */
  84 extern const unsigned int  IRCD_CharAttrTab[];
  85
  86 #define NTL_DIGIT   0x0008  /**< 0123456789                          */
  87
  88 /** Test whether a character is a digit. */
  89 #define IsDigit(c)         (IRCD_CharAttrTab[(c) - CHAR_MIN] & NTL_DIGIT)
  90
  91 #endif /* __irc_ipv6_H */