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Diffstat (limited to 'hicn-light/src/hicn/api/ip_address.h')
| -rw-r--r-- | hicn-light/src/hicn/api/ip_address.h | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/hicn-light/src/hicn/api/ip_address.h b/hicn-light/src/hicn/api/ip_address.h new file mode 100644 index 000000000..b58981d85 --- /dev/null +++ b/hicn-light/src/hicn/api/ip_address.h @@ -0,0 +1,221 @@ +/* + * 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 ip_address.h + * \brief IP address type support + */ +#ifndef IP_ADDRESS_H +#define IP_ADDRESS_H + +#include <arpa/inet.h> // inet_ntop +#ifdef __APPLE__ +#include <libkern/OSByteOrder.h> +#define __bswap_constant_32(x) OSSwapInt32(x) +#include <machine/endian.h> +#else +#include <endian.h> +#endif +#include <errno.h> +#include <netdb.h> // struct addrinfo +#include <netinet/in.h> // INET*_ADDRSTRLEN, IN*ADDR_LOOPBACK +#include <stdlib.h> +#include <string.h> // memset + +#include <hicn/api/types.h> + +#define bytes_to_bits(x) (x * 8) +#define IPV6_ADDR_LEN 16 /* bytes */ +#define IPV4_ADDR_LEN 4 /* bytes */ +#define IPV6_ADDR_LEN_BITS bytes_to_bits(IPV6_ADDR_LEN) +#define IPV4_ADDR_LEN_BITS bytes_to_bits(IPV4_ADDR_LEN) + +#define IP_MAX_ADDR_LEN IPV6_ADDR_LEN + +#define DUMMY_PORT 1234 + +typedef uint8_t u8; +typedef uint16_t u16; +typedef uint32_t u32; +typedef uint64_t u64; + +typedef union { + union { + struct in_addr as_inaddr; + u8 as_u8[4]; + u16 as_u16[2]; + u32 as_u32; + } v4; + union { + struct in6_addr as_in6addr; + u8 as_u8[16]; + u16 as_u16[8]; + u32 as_u32[4]; + u64 as_u64[2]; + } v6; + u8 buffer[IP_MAX_ADDR_LEN]; + u8 as_u8[IP_MAX_ADDR_LEN]; + u16 as_u16[IP_MAX_ADDR_LEN >> 1]; + u32 as_u32[IP_MAX_ADDR_LEN >> 2]; + u64 as_u64[IP_MAX_ADDR_LEN >> 3]; +} ip_address_t; + +#define MAXSZ_IP4_ADDRESS_ INET_ADDRSTRLEN - 1 +#define MAXSZ_IP6_ADDRESS_ INET6_ADDRSTRLEN - 1 +#define MAXSZ_IP_ADDRESS_ MAXSZ_IP6_ADDRESS_ +#define MAXSZ_IP4_ADDRESS MAXSZ_IP4_ADDRESS_ + 1 +#define MAXSZ_IP6_ADDRESS MAXSZ_IP6_ADDRESS_ + 1 +#define MAXSZ_IP_ADDRESS MAXSZ_IP_ADDRESS_ + 1 + +/* No htonl() with const */ +static const ip_address_t IPV4_LOOPBACK = { +#if __BYTE_ORDER == __LITTLE_ENDIAN + .v4.as_inaddr.s_addr = __bswap_constant_32(INADDR_LOOPBACK), +#else + .v4.as_inaddr.s_addr = INADDR_LOOPBACK, +#endif +}; + +static const ip_address_t IPV6_LOOPBACK = { + .v6.as_in6addr = IN6ADDR_LOOPBACK_INIT, +}; + +#define MAX_PORT 1 << (8 * sizeof(u16)) +#define IS_VALID_PORT(x) ((x > 0) && (x < MAX_PORT)) + +#define MAXSZ_PORT_ 5 +#define MAXSZ_PORT MAXSZ_PORT_ + 1 + +#define IS_VALID_FAMILY(x) ((x == AF_INET) || (x == AF_INET6)) + +static inline int ip_address_get_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; +} + +static inline int ip_address_len(const ip_address_t *ip_address, int family) { + return (family == AF_INET6) ? IPV6_ADDR_LEN + : (family == AF_INET) ? IPV4_ADDR_LEN : 0; +} + +static inline int ip_address_ntop(const ip_address_t *ip_address, char *dst, + const size_t len, int family) { + const char *s = inet_ntop(family, ip_address->buffer, dst, len); + return (s ? 1 : -1); +} + +/* + * Parse ip addresses in presentation format, or prefixes (in bits, separated by + * a slash) + */ +static inline int ip_address_pton(const char *ip_address_str, + ip_address_t *ip_address) { + int pton_fd; +#ifdef IP_ADDRESS_PREFIX + char *p; + char *eptr; + u32 dst_len; +#endif /* IP_ADDRESS_PREFIX */ + char *addr = strdup(ip_address_str); + int family; + +#ifdef IP_ADDRESS_PREFIX + p = strchr(addr, '/'); + if (!p) { + dst_len = 0; // until we get the ip address family + } else { + dst_len = strtoul(p + 1, &eptr, 10); + *p = 0; + } +#endif /* IP_ADDRESS_PREFIX */ + + family = ip_address_get_family(addr); + + switch (family) { + case AF_INET6: +#ifdef IP_ADDRESS_PREFIX + if (dst_len > IPV6_ADDR_LEN_BITS) goto ERR; +#endif /* IP_ADDRESS_PREFIX */ + pton_fd = inet_pton(AF_INET6, addr, &ip_address->buffer); + break; + case AF_INET: +#ifdef IP_ADDRESS_PREFIX + if (dst_len > IPV4_ADDR_LEN_BITS) goto ERR; +#endif /* IP_ADDRESS_PREFIX */ + pton_fd = inet_pton(AF_INET, addr, &ip_address->buffer); + break; + default: + goto ERR; + } + + // 0 = not in presentation format + // < 0 = other error (use perror) + if (pton_fd <= 0) { + goto ERR; + } + + return 1; +ERR: + free(addr); + return -1; +} + +static inline int ip_address_snprintf(char *s, size_t size, + const ip_address_t *ip_address, + int family) { + size_t len = family == AF_INET ? INET_ADDRSTRLEN : INET6_ADDRSTRLEN; + const char *rc = inet_ntop(family, ip_address->buffer, s, len); + return rc ? strlen(rc) : -1; +} + +static inline int ip_address_to_sockaddr(const ip_address_t *ip_address, + struct sockaddr *sockaddr_address, + int family) { + struct sockaddr_in6 *tmp6 = (struct sockaddr_in6 *)sockaddr_address; + struct sockaddr_in *tmp4 = (struct sockaddr_in *)sockaddr_address; + + switch (family) { + case AF_INET6: + tmp6->sin6_family = AF_INET6; + tmp6->sin6_port = DUMMY_PORT; + tmp6->sin6_scope_id = 0; + memcpy(&tmp6->sin6_addr, ip_address->buffer, IPV6_ADDR_LEN); + break; + case AF_INET: + tmp4->sin_family = AF_INET; + tmp4->sin_port = DUMMY_PORT; + memcpy(&tmp4->sin_addr, ip_address->buffer, IPV4_ADDR_LEN); + break; + default: + return -1; + } + + return 1; +} + +#endif /* IP_ADDRESS_H */ |