Add the network utility file
Moving utility functions from network manager to
util.cpp.
Added few more utility functions.
Change-Id: I2e73c873e9a3bea543d6979463b2181e8374e12e
Signed-off-by: Ratan Gupta <ratagupt@in.ibm.com>
diff --git a/util.cpp b/util.cpp
new file mode 100644
index 0000000..740d4a7
--- /dev/null
+++ b/util.cpp
@@ -0,0 +1,144 @@
+#include <arpa/inet.h>
+#include <dirent.h>
+#include <net/if.h>
+
+#include <iostream>
+#include <list>
+#include <string>
+#include <algorithm>
+#include <phosphor-logging/log.hpp>
+
+namespace phosphor
+{
+namespace network
+{
+namespace
+{
+
+using namespace phosphor::logging;
+
+uint8_t toV6Cidr(const std::string& subnetMask)
+{
+ uint8_t pos = 0;
+ uint8_t prevPos = 0;
+ uint8_t cidr = 0;
+ uint16_t buff {};
+ do
+ {
+ //subnet mask look like ffff:ffff::
+ // or ffff:c000::
+ pos = subnetMask.find(":", prevPos);
+ if (pos == std::string::npos)
+ {
+ break;
+ }
+
+ auto str = subnetMask.substr(prevPos, (pos - prevPos));
+ prevPos = pos + 1;
+
+ // String length is 0
+ if (!str.length())
+ {
+ return cidr;
+ }
+ //converts it into number.
+ if (sscanf(str.c_str(), "%hx", &buff) <= 0)
+ {
+ log<level::ERR>("Invalid Mask",
+ entry("SUBNETMASK=%s", subnetMask));
+
+ return 0;
+ }
+
+ // convert the number into bitset
+ // and check for how many ones are there.
+ // if we don't have all the ones then make
+ // sure that all the ones should be left justify.
+
+ if (__builtin_popcount(buff) != 16)
+ {
+ if (((sizeof(buff) * 8) - (__builtin_ctz(buff))) != __builtin_popcount(buff))
+ {
+ log<level::ERR>("Invalid Mask",
+ entry("SUBNETMASK=%s", subnetMask));
+
+ return 0;
+ }
+ cidr += __builtin_popcount(buff);
+ return cidr;
+ }
+
+ cidr += 16;
+ }
+ while (1);
+
+ return cidr;
+}
+}// anonymous namespace
+
+uint8_t toCidr(int addressFamily, const std::string& subnetMask)
+{
+ if (addressFamily == AF_INET6)
+ {
+ return toV6Cidr(subnetMask);
+ }
+
+ uint32_t buff;
+
+ auto rc = inet_pton(addressFamily, subnetMask.c_str(), &buff);
+ if (rc <= 0)
+ {
+ log<level::ERR>("inet_pton failed:",
+ entry("SUBNETMASK=%s", subnetMask));
+ return 0;
+ }
+
+ buff = be32toh(buff);
+ // total no of bits - total no of leading zero == total no of ones
+ if (((sizeof(buff) * 8) - (__builtin_ctz(buff))) == __builtin_popcount(buff))
+ {
+ return __builtin_popcount(buff);
+ }
+ else
+ {
+ log<level::ERR>("Invalid Mask",
+ entry("SUBNETMASK=%s", subnetMask));
+ return 0;
+ }
+}
+
+std::string toMask(int addressFamily, uint8_t prefix)
+{
+ if (addressFamily == AF_INET6)
+ {
+ //TODO:- conversion for v6
+ return "";
+ }
+
+ if (prefix < 1 || prefix > 30)
+ {
+ log<level::ERR>("Invalid Prefix",
+ entry("PREFIX=%d", prefix));
+ return "";
+ }
+ /* Create the netmask from the number of bits */
+ unsigned long mask = 0;
+ for (auto i = 0 ; i < prefix ; i++)
+ {
+ mask |= 1 << (31 - i);
+ }
+ struct in_addr netmask;
+ netmask.s_addr = htonl(mask);
+ return inet_ntoa(netmask);
+}
+
+bool isLinkLocal(const std::string& address)
+{
+ std::string linklocal = "fe80";
+ return std::mismatch(linklocal.begin(), linklocal.end(),
+ address.begin()).first == linklocal.end() ?
+ true : false;
+}
+
+}//namespace network
+}//namespace phosphor