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-rwxr-xr-xlib/src/common.c165
1 files changed, 165 insertions, 0 deletions
diff --git a/lib/src/common.c b/lib/src/common.c
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index 000000000..4b7c4a2a7
--- /dev/null
+++ b/lib/src/common.c
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+/*
+ * Copyright (c) 2017-2019 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file common.c
+ * @brief Implementation of common interfaces abstracting low-level platform.
+ * details.
+ */
+
+#include <stdlib.h>
+#include <string.h> // memset
+#include <sys/types.h> // getaddrinfo
+#include <sys/socket.h> // ''
+#include <netdb.h> // ''
+#include <stdio.h>
+
+#include "common.h"
+
+
+int
+get_addr_family (const char *ip_address)
+{
+ struct addrinfo hint, *res = NULL;
+ int rc;
+
+ memset (&hint, '\0', sizeof hint);
+
+ hint.ai_family = PF_UNSPEC;
+ hint.ai_flags = AI_NUMERICHOST;
+
+ rc = getaddrinfo (ip_address, NULL, &hint, &res);
+ if (rc)
+ {
+ return -1;
+ }
+ rc = res->ai_family;
+ freeaddrinfo (res);
+ return rc;
+}
+
+/* hashes */
+
+u32
+cumulative_hash32 (const void *data, size_t len, u32 lastValue)
+{
+ // Standard FNV 32-bit prime: see http://www.isthe.com/chongo/tech/comp/fnv/#FNV-param
+ const u32 fnv1a_prime = 0x01000193;
+ u32 hash = lastValue;
+ size_t i;
+
+ const char *chardata = data;
+
+ for (i = 0; i < len; i++)
+ {
+ hash = hash ^ chardata[i];
+ hash = hash * fnv1a_prime;
+ }
+
+ return hash;
+}
+
+u32
+hash32 (const void *data, size_t len)
+{
+ // Standard FNV 32-bit offset: see http://www.isthe.com/chongo/tech/comp/fnv/#FNV-param
+ const u32 fnv1a_offset = 0x811C9DC5;
+ return cumulative_hash32 (data, len, fnv1a_offset);
+}
+
+u64
+cumulative_hash64 (const void *data, size_t len, u64 lastValue)
+{
+ // Standard FNV 64-bit prime: see http://www.isthe.com/chongo/tech/comp/fnv/#FNV-param
+ const u64 fnv1a_prime = 0x00000100000001B3ULL;
+ u64 hash = lastValue;
+ const char *chardata = data;
+ size_t i;
+
+ for (i = 0; i < len; i++)
+ {
+ hash = hash ^ chardata[i];
+ hash = hash * fnv1a_prime;
+ }
+
+ return hash;
+}
+
+u64
+hash64 (const void *data, size_t len)
+{
+ // Standard FNV 64-bit offset: see http://www.isthe.com/chongo/tech/comp/fnv/#FNV-param
+ const u64 fnv1a_offset = 0xCBF29CE484222325ULL;
+ return cumulative_hash64 (data, len, fnv1a_offset);
+}
+
+void
+hicn_packet_dump (uint8_t * buffer, size_t len)
+{
+ int i;
+ unsigned char buff[17];
+ unsigned char *pc = (unsigned char *) buffer;
+
+ // Output description if given.
+ if (len == 0)
+ {
+ printf (" ZERO LENGTH\n");
+ return;
+ }
+
+ // Process every byte in the data.
+ for (i = 0; i < len; i++)
+ {
+ // Multiple of 16 means new line (with line offset).
+
+ if ((i % 16) == 0)
+ {
+ // Just don't print ASCII for the zeroth line.
+ if (i != 0)
+ printf (" %s\n", buff);
+
+ // Output the offset.
+ printf (" %04x ", i);
+ }
+
+ // Now the hex code for the specific character.
+ printf (" %02x", pc[i]);
+
+ // And store a printable ASCII character for later.
+ if ((pc[i] < 0x20) || (pc[i] > 0x7e))
+ buff[i % 16] = '.';
+ else
+ buff[i % 16] = pc[i];
+ buff[(i % 16) + 1] = '\0';
+ }
+
+ // Pad out last line if not exactly 16 characters.
+ while ((i % 16) != 0)
+ {
+ printf (" ");
+ i++;
+ }
+
+ // And print the final ASCII bit.
+ printf (" %s\n", buff);
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */