extern ServerConfig* Config;
extern time_t TIME;
-/** This will bind a socket to a port. It works for UDP/TCP.
- * If a hostname is given to bind to, the function will first
- * attempt to resolve the hostname, then bind to the IP the
- * hostname resolves to. This is a blocking lookup blocking for
- * a maximum of one second before it times out, using the DNS
- * server specified in the configuration file.
- */
-bool BindSocket(int sockfd, insp_sockaddr client, insp_sockaddr server, int port, char* addr)
+/* Used when comparing CIDR masks for the modulus bits left over */
+
+char inverted_bits[8] = { 0x00, /* 00000000 - 0 bits */
+ 0x80, /* 10000000 - 1 bits */
+ 0xC0, /* 11000000 - 2 bits */
+ 0xE0, /* 11100000 - 3 bits */
+ 0xF0, /* 11110000 - 4 bits */
+ 0xF8, /* 11111000 - 5 bits */
+ 0xFC, /* 11111100 - 6 bits */
+ 0xFE /* 11111110 - 7 bits */
+};
+
+/* Match raw bytes using CIDR bit matching, used by higher level MatchCIDR() */
+bool MatchCIDRBits(unsigned char* address, unsigned char* mask, unsigned int mask_bits)
{
- memset(&server,0,sizeof(server));
- insp_inaddr addy;
- bool resolved = false;
- char resolved_addr[128];
+ unsigned int modulus = mask_bits % 8; /* Number of whole bytes in the mask */
+ unsigned int divisor = mask_bits / 8; /* Remaining bits in the mask after whole bytes are dealt with */
- if (*addr == '*')
- *addr = 0;
+ /* First compare the whole bytes, if they dont match, return false */
+ if (memcmp(address, mask, divisor))
+ return false;
+
+ /* Now if there are any remainder bits, we compare them with logic AND */
+ if (modulus)
+ if ((address[divisor] & inverted_bits[modulus]) != (mask[divisor] & inverted_bits[modulus]))
+ /* If they dont match, return false */
+ return false;
+
+ /* The address matches the mask, to mask_bits bits of mask */
+ return true;
+}
+
+/* Match CIDR strings, e.g. 127.0.0.1 to 127.0.0.0/8 or 3ffe:1:5:6::8 to 3ffe:1::0/32
+ * If you have a lot of hosts to match, youre probably better off building your mask once
+ * and then using the lower level MatchCIDRBits directly.
+ */
+bool MatchCIDR(const char* address, const char* cidr_mask)
+{
+ unsigned char addr_raw[16];
+ unsigned char mask_raw[16];
+ unsigned int bits = 0;
+ char* mask = strdup(cidr_mask);
- if (*addr && (insp_aton(addr,&addy) < 0))
+ in_addr address_in4;
+ in_addr mask_in4;
+
+ char* bits_chars = strchr(mask,'/');
+
+ if (bits_chars)
+ {
+ bits = atoi(bits_chars + 1);
+ *bits_chars = 0;
+ }
+ else
{
- /* If they gave a hostname, bind to the IP it resolves to */
- if (CleanAndResolve(resolved_addr, addr, true, 1))
+ /* No 'number of bits' field! */
+ return false;
+ }
+
+#ifdef SUPPORT_IP6LINKS
+ in6_addr address_in6;
+ in6_addr mask_in6;
+
+ if (inet_pton(AF_INET6, address, &address_in6) > 0)
+ {
+ if (inet_pton(AF_INET6, mask, &mask_in6) > 0)
{
- insp_aton(resolved_addr,&addy);
- log(DEFAULT,"Resolved binding '%s' -> '%s'",addr,resolved_addr);
-#ifdef IPV6
- /* Todo: Deal with resolution of IPV6 */
- server.sin6_addr = addy;
-#else
- server.sin_addr = addy;
+ memcpy(&addr_raw, &address_in6.s6_addr, 16);
+ memcpy(&mask_raw, &mask_in6.s6_addr, 16);
+ }
+ else
+ {
+ free(mask);
+ return false;
+ }
+ }
+ else
#endif
- resolved = true;
+ if (inet_pton(AF_INET, address, &address_in4) > 0)
+ {
+ if (inet_pton(AF_INET, mask, &mask_in4) > 0)
+ {
+ memcpy(&addr_raw, &address_in4.s_addr, 4);
+ memcpy(&mask_raw, &mask_in4.s_addr, 4);
}
else
{
- log(DEFAULT,"WARNING: Could not resolve '%s' to an IP for binding to on port %d",addr,port);
+ free(mask);
return false;
}
}
+ else
+ {
+ free(mask);
+ return false;
+ }
+
+ free(mask);
+ return MatchCIDRBits(addr_raw, mask_raw, bits);
+}
+
+/** This will bind a socket to a port. It works for UDP/TCP.
+ * It can only bind to IP addresses, if you wish to bind to hostnames
+ * you should first resolve them using class 'Resolver'.
+ */
+bool BindSocket(int sockfd, insp_sockaddr client, insp_sockaddr server, int port, char* addr)
+{
+ memset(&server,0,sizeof(server));
+ insp_inaddr addy;
+
+ if (*addr == '*')
+ *addr = 0;
+
+ if ((*addr) && (insp_aton(addr,&addy) < 1))
+ {
+ log(DEBUG,"Invalid IP '%s' given to BindSocket()", addr);
+ return false;;
+ }
+
#ifdef IPV6
server.sin6_family = AF_FAMILY;
#else
server.sin_family = AF_FAMILY;
#endif
- if (!resolved)
+ if (!*addr)
{
- if (!*addr)
- {
#ifdef IPV6
- memcpy(&addy, &server.sin6_addr, sizeof(in6_addr));
+ memcpy(&addy, &server.sin6_addr, sizeof(in6_addr));
#else
- server.sin_addr.s_addr = htonl(INADDR_ANY);
+ server.sin_addr.s_addr = htonl(INADDR_ANY);
#endif
- }
- else
- {
+ }
+ else
+ {
#ifdef IPV6
- memcpy(&addy, &server.sin6_addr, sizeof(in6_addr));
+ memcpy(&addy, &server.sin6_addr, sizeof(in6_addr));
#else
- server.sin_addr = addy;
+ server.sin_addr = addy;
#endif
- }
}
#ifdef IPV6
server.sin6_port = htons(port);
int insp_aton(const char* a, insp_inaddr* n)
{
- return inet_pton(AF_FAMILY, a, &n);
+ return inet_pton(AF_FAMILY, a, n);
}
+