lws-network-helper.h

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/*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010 - 2023 Andy Green <andy@warmcat.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

LWS_VISIBLE LWS_EXTERN struct lws_dll2_owner *
lws_routing_table_get(struct lws_context *cx);

 
#if defined(LWS_ESP_PLATFORM)
#include <lwip/sockets.h>
#endif
 
/* cope with large amounts of route information */
typedef uint16_t lws_route_uidx_t;
 
typedef struct lws_dns_score {
        uint8_t precedence;
        uint8_t label;
} lws_dns_score_t;
 
/*
 * This represents an entry in the system routing table
 */
 
typedef struct lws_route {
        lws_dll2_t              list;
 
        lws_sockaddr46          src;
        lws_sockaddr46          dest;
        lws_sockaddr46          gateway;
 
        struct lws_route        *source; /* when used as lws_dns_sort_t */
        lws_dns_score_t         score; /* when used as lws_dns_sort_t */
 
        int                     if_idx;
        int                     priority;
        int                     ifa_flags; /* if source_ads */
 
        lws_route_uidx_t        uidx; /* unique index for this route */
 
        uint8_t                 proto;
        uint8_t                 dest_len;
        uint8_t                 src_len;
        uint8_t                 scope; /* if source_ads */
        uint8_t                 af; /* if source_ads */
 
        uint8_t                 source_ads:1;
} lws_route_t;
 
/*
 * We reuse the route object as the dns sort granule, so there's only one
 * struct needs to know all the gnarly ipv6 details
 */
 
typedef lws_route_t lws_dns_sort_t;

LWS_VISIBLE LWS_EXTERN const char * LWS_WARN_UNUSED_RESULT
lws_canonical_hostname(struct lws_context *context);

LWS_VISIBLE LWS_EXTERN int LWS_WARN_UNUSED_RESULT
lws_get_peer_addresses(struct lws *wsi, lws_sockfd_type fd, char *name,
                       int name_len, char *rip, int rip_len);

LWS_VISIBLE LWS_EXTERN const char *
lws_get_peer_simple(struct lws *wsi, char *name, size_t namelen);
 
LWS_VISIBLE LWS_EXTERN const char *
lws_get_peer_simple_fd(lws_sockfd_type fd, char *name, size_t namelen);
 
#define LWS_ITOSA_USABLE        0
#define LWS_ITOSA_NOT_EXIST     -1
#define LWS_ITOSA_NOT_USABLE    -2
#define LWS_ITOSA_BUSY          -3 /* only returned by lws_socket_bind() on
                                        EADDRINUSE */
 
#if !defined(LWS_PLAT_FREERTOS) && !defined(LWS_PLAT_OPTEE)
LWS_VISIBLE LWS_EXTERN int
lws_interface_to_sa(int ipv6, const char *ifname, struct sockaddr_in *addr,
                    size_t addrlen);
#endif

LWS_VISIBLE LWS_EXTERN int
lws_sa46_compare_ads(const lws_sockaddr46 *sa46a, const lws_sockaddr46 *sa46b);

LWS_VISIBLE LWS_EXTERN int
lws_sa46_on_net(const lws_sockaddr46 *sa46a, const lws_sockaddr46 *sa46_net,
                        int net_len);
 
/*
 * lws_parse_numeric_address() - converts numeric ipv4 or ipv6 to byte address
 *
 * \param ads: the numeric ipv4 or ipv6 address string
 * \param result: result array
 * \param max_len: max length of result array
 *
 * Converts a 1.2.3.4 or 2001:abcd:123:: or ::ffff:1.2.3.4 formatted numeric
 * address into an array of network ordered byte address elements.
 *
 * Returns < 0 on error, else length of result set, either 4 or 16 for ipv4 /
 * ipv6.
 */
LWS_VISIBLE LWS_EXTERN int
lws_parse_numeric_address(const char *ads, uint8_t *result, size_t max_len);
 
/*
 * lws_sa46_parse_numeric_address() - converts numeric ipv4 or ipv6 to sa46
 *
 * \param ads: the numeric ipv4 or ipv6 address string
 * \param sa46: pointer to sa46 to set
 *
 * Converts a 1.2.3.4 or 2001:abcd:123:: or ::ffff:1.2.3.4 formatted numeric
 * address into an sa46, a union of sockaddr_in or sockaddr_in6 depending on
 * what kind of address was found.  sa46->sa4.sin_fmaily will be AF_INET if
 * ipv4, or AF_INET6 if ipv6.
 *
 * Returns 0 if the sa46 was set, else < 0 on error.
 */
LWS_VISIBLE LWS_EXTERN int
lws_sa46_parse_numeric_address(const char *ads, lws_sockaddr46 *sa46);

LWS_VISIBLE LWS_EXTERN int
lws_write_numeric_address(const uint8_t *ads, int size, char *buf, size_t len);

LWS_VISIBLE LWS_EXTERN int
lws_sa46_write_numeric_address(lws_sockaddr46 *sa46, char *buf, size_t len);

LWS_VISIBLE LWS_EXTERN int
lws_parse_mac(const char *ads, uint8_t *result_6_bytes);
 
LWS_VISIBLE LWS_EXTERN int
lws_parse_cidr(const char *cidr, lws_sockaddr46 *sa46, int *len);

LWS_VISIBLE LWS_EXTERN int
lws_is_lan_address(const char *ads);
 
/*
 * lws_is_local_address() - checks if the given string represents a local address
 *
 * \param ads: the address string to check
 *
 * Returns 1 if the address is a recognized local address like "localhost" or "127.0.0.1",
 * else 0.
 */
LWS_VISIBLE LWS_EXTERN int
lws_is_local_address(const char *ads);

LWS_VISIBLE LWS_EXTERN int
lws_is_lan_address(const char *ads);