491 lines
14 KiB
C
491 lines
14 KiB
C
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/*
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* Copyright (C) 2005,2006 Justin Karneges
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef JDNS_H
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#define JDNS_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef void (*jdns_object_dtor_func)(void *);
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typedef void *(*jdns_object_cctor_func)(const void *);
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#define JDNS_OBJECT \
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jdns_object_dtor_func dtor; \
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jdns_object_cctor_func cctor;
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#define JDNS_OBJECT_NEW(name) \
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(name##_t *)jdns_object_new(sizeof(name##_t), \
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(jdns_object_dtor_func)name##_delete, \
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(jdns_object_cctor_func)name##_copy);
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typedef struct jdns_object
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{
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JDNS_OBJECT
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} jdns_object_t;
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void *jdns_object_new(int size, void (*dtor)(void *),
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void *(*cctor)(const void *));
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void *jdns_object_copy(const void *a);
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void jdns_object_delete(void *a);
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void jdns_object_free(void *a);
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#define JDNS_LIST_DECLARE(name) \
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JDNS_OBJECT \
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int count; \
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name##_t **item;
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typedef struct jdns_list
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{
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JDNS_OBJECT
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int count;
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void **item;
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int valueList;
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int autoDelete;
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} jdns_list_t;
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jdns_list_t *jdns_list_new();
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jdns_list_t *jdns_list_copy(const jdns_list_t *a);
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void jdns_list_delete(jdns_list_t *a);
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void jdns_list_clear(jdns_list_t *a);
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void jdns_list_insert(jdns_list_t *a, void *item, int pos);
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void jdns_list_insert_value(jdns_list_t *a, const void *item, int pos);
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void jdns_list_remove(jdns_list_t *a, void *item);
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void jdns_list_remove_at(jdns_list_t *a, int pos);
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typedef struct jdns_string
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{
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JDNS_OBJECT
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unsigned char *data;
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int size;
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} jdns_string_t;
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jdns_string_t *jdns_string_new();
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jdns_string_t *jdns_string_copy(const jdns_string_t *s);
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void jdns_string_delete(jdns_string_t *s);
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void jdns_string_set(jdns_string_t *s, const unsigned char *str,
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int str_len);
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void jdns_string_set_cstr(jdns_string_t *s, const char *str);
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// overlays jdns_list
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typedef struct jdns_stringlist
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{
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JDNS_OBJECT
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int count;
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jdns_string_t **item;
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} jdns_stringlist_t;
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jdns_stringlist_t *jdns_stringlist_new();
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jdns_stringlist_t *jdns_stringlist_copy(const jdns_stringlist_t *a);
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void jdns_stringlist_delete(jdns_stringlist_t *a);
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void jdns_stringlist_append(jdns_stringlist_t *a, const jdns_string_t *str);
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typedef struct jdns_address
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{
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int isIpv6;
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union
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{
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unsigned long int v4;
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unsigned char *v6; // 16 bytes
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} addr;
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char *c_str;
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} jdns_address_t;
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jdns_address_t *jdns_address_new();
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jdns_address_t *jdns_address_copy(const jdns_address_t *a);
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void jdns_address_delete(jdns_address_t *a);
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void jdns_address_set_ipv4(jdns_address_t *a, unsigned long int ipv4);
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void jdns_address_set_ipv6(jdns_address_t *a, const unsigned char *ipv6);
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// return 1 if string was ok, else 0. Note: IPv4 addresses only!
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int jdns_address_set_cstr(jdns_address_t *a, const char *str);
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// return 1 if the same, else 0
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int jdns_address_cmp(const jdns_address_t *a, const jdns_address_t *b);
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// convenient predefined addresses/ports
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#define JDNS_UNICAST_PORT 53
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#define JDNS_MULTICAST_PORT 5353
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jdns_address_t *jdns_address_multicast4_new(); // 224.0.0.251
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jdns_address_t *jdns_address_multicast6_new(); // FF02::FB
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typedef struct jdns_server
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{
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unsigned char *name;
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int port; // SRV only
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int priority;
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int weight; // SRV only
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} jdns_server_t;
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jdns_server_t *jdns_server_new();
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jdns_server_t *jdns_server_copy(const jdns_server_t *s);
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void jdns_server_delete(jdns_server_t *s);
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void jdns_server_set_name(jdns_server_t *s, const unsigned char *name);
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typedef struct jdns_nameserver
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{
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jdns_address_t *address;
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int port;
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} jdns_nameserver_t;
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jdns_nameserver_t *jdns_nameserver_new();
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jdns_nameserver_t *jdns_nameserver_copy(const jdns_nameserver_t *a);
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void jdns_nameserver_delete(jdns_nameserver_t *a);
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void jdns_nameserver_set(jdns_nameserver_t *a, const jdns_address_t *addr,
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int port);
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typedef struct jdns_nameserverlist
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{
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int count;
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jdns_nameserver_t **item;
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} jdns_nameserverlist_t;
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jdns_nameserverlist_t *jdns_nameserverlist_new();
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jdns_nameserverlist_t *jdns_nameserverlist_copy(
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const jdns_nameserverlist_t *a);
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void jdns_nameserverlist_delete(jdns_nameserverlist_t *a);
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void jdns_nameserverlist_append(jdns_nameserverlist_t *a,
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const jdns_address_t *addr, int port);
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typedef struct jdns_dnshost
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{
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jdns_string_t *name;
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jdns_address_t *address;
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} jdns_dnshost_t;
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typedef struct jdns_dnshostlist
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{
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int count;
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jdns_dnshost_t **item;
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} jdns_dnshostlist_t;
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typedef struct jdns_dnsparams
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{
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jdns_nameserverlist_t *nameservers;
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jdns_stringlist_t *domains;
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jdns_dnshostlist_t *hosts;
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} jdns_dnsparams_t;
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jdns_dnsparams_t *jdns_dnsparams_new();
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jdns_dnsparams_t *jdns_dnsparams_copy(jdns_dnsparams_t *a);
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void jdns_dnsparams_delete(jdns_dnsparams_t *a);
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void jdns_dnsparams_append_nameserver(jdns_dnsparams_t *a,
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const jdns_address_t *addr, int port);
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void jdns_dnsparams_append_domain(jdns_dnsparams_t *a,
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const jdns_string_t *domain);
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void jdns_dnsparams_append_host(jdns_dnsparams_t *a,
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const jdns_string_t *name, const jdns_address_t *address);
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#define JDNS_RTYPE_A 1
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#define JDNS_RTYPE_AAAA 28
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#define JDNS_RTYPE_MX 15
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#define JDNS_RTYPE_SRV 33
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#define JDNS_RTYPE_CNAME 5
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#define JDNS_RTYPE_PTR 12
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#define JDNS_RTYPE_TXT 16
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#define JDNS_RTYPE_HINFO 13
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#define JDNS_RTYPE_NS 2
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#define JDNS_RTYPE_ANY 255
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typedef struct jdns_rr
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{
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unsigned char *owner;
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int ttl;
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int type;
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int qclass;
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int rdlength;
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unsigned char *rdata;
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int haveKnown;
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union
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{
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jdns_address_t *address; // for A, AAAA
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jdns_server_t *server; // for MX, SRV
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unsigned char *name; // for CNAME, PTR, NS
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jdns_stringlist_t *texts; // for TXT
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struct
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{
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jdns_string_t *cpu;
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jdns_string_t *os;
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} hinfo; // for HINFO
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} data;
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} jdns_rr_t;
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jdns_rr_t *jdns_rr_new();
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jdns_rr_t *jdns_rr_copy(const jdns_rr_t *r);
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void jdns_rr_delete(jdns_rr_t *r);
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void jdns_rr_set_owner(jdns_rr_t *r, const unsigned char *name);
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void jdns_rr_set_record(jdns_rr_t *r, int type, const unsigned char *rdata,
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int rdlength);
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void jdns_rr_set_A(jdns_rr_t *r, const jdns_address_t *address);
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void jdns_rr_set_AAAA(jdns_rr_t *r, const jdns_address_t *address);
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void jdns_rr_set_MX(jdns_rr_t *r, const unsigned char *name, int priority);
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void jdns_rr_set_SRV(jdns_rr_t *r, const unsigned char *name, int port,
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int priority, int weight);
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void jdns_rr_set_CNAME(jdns_rr_t *r, const unsigned char *name);
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void jdns_rr_set_PTR(jdns_rr_t *r, const unsigned char *name);
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void jdns_rr_set_TXT(jdns_rr_t *r, const jdns_stringlist_t *texts);
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void jdns_rr_set_HINFO(jdns_rr_t *r, const jdns_string_t *cpu,
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const jdns_string_t *os);
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void jdns_rr_set_NS(jdns_rr_t *r, const unsigned char *name);
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// note: only works on known types
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int jdns_rr_verify(const jdns_rr_t *r);
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typedef struct jdns_response
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{
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int answerCount;
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jdns_rr_t **answerRecords;
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int authorityCount;
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jdns_rr_t **authorityRecords;
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int additionalCount;
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jdns_rr_t **additionalRecords;
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} jdns_response_t;
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jdns_response_t *jdns_response_new();
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jdns_response_t *jdns_response_copy(const jdns_response_t *r);
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void jdns_response_delete(jdns_response_t *r);
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void jdns_response_append_answer(jdns_response_t *r, const jdns_rr_t *rr);
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void jdns_response_append_authority(jdns_response_t *r, const jdns_rr_t *rr);
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void jdns_response_append_additional(jdns_response_t *r,
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const jdns_rr_t *rr);
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#define JDNS_PUBLISH_SHARED 0x0001
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#define JDNS_PUBLISH_UNIQUE 0x0002
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#define JDNS_STEP_TIMER 0x0001
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#define JDNS_STEP_HANDLE 0x0002
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#define JDNS_EVENT_RESPONSE 0x0001
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#define JDNS_EVENT_PUBLISH 0x0002
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#define JDNS_EVENT_SHUTDOWN 0x0003
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#define JDNS_STATUS_SUCCESS 0x0001
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#define JDNS_STATUS_NXDOMAIN 0x0002
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#define JDNS_STATUS_ERROR 0x0003
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#define JDNS_STATUS_TIMEOUT 0x0004
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#define JDNS_STATUS_CONFLICT 0x0005
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typedef struct jdns_session jdns_session_t;
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typedef struct jdns_callbacks
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{
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void *app; // user-supplied context
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// time_now:
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// s: session
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// app: user-supplied context
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// return: milliseconds since session started
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int (*time_now)(jdns_session_t *s, void *app);
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// rand_int:
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// s: session
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// app: user-supplied context
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// return: random integer between 0-65535
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int (*rand_int)(jdns_session_t *s, void *app);
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// debug_line:
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// s: session
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// app: user-supplied context
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// str: a line of debug text
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// return: nothing
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void (*debug_line)(jdns_session_t *s, void *app, const char *str);
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// udp_bind:
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// s: session
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// app: user-supplied context
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// addr: ip address of interface to bind to. 0 for all
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// port: port of interface to bind to. 0 for any
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// maddr: multicast address. 0 if not using multicast
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// return: handle (>0) of bound socket, or 0 on error
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// note: for multicast, the following must be done:
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// use SO_REUSEPORT to share with other mdns programs
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// use IP_ADD_MEMBERSHIP to associate addr and maddr
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// set IP_MULTICAST_TTL to 255
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int (*udp_bind)(jdns_session_t *s, void *app,
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const jdns_address_t *addr, int port,
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const jdns_address_t *maddr);
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// udp_unbind:
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// s: session
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// app: user-supplied context
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// handle: handle of socket obtained with udp_bind
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// return: nothing
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void (*udp_unbind)(jdns_session_t *s, void *app, int handle);
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// udp_read:
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// s: session
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// app: user-supplied context
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// handle: handle of socket obtained with udp_bind
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// addr: store ip address of sender
|
||
|
|
// port: store port of sender
|
||
|
|
// buf: store packet content
|
||
|
|
// bufsize: value contains max size, to be changed to real size
|
||
|
|
// return: 1 if packet read, 0 if none available
|
||
|
|
int (*udp_read)(jdns_session_t *s, void *app, int handle,
|
||
|
|
jdns_address_t *addr, int *port, unsigned char *buf,
|
||
|
|
int *bufsize);
|
||
|
|
|
||
|
|
// udp_write:
|
||
|
|
// s: session
|
||
|
|
// app: user-supplied context
|
||
|
|
// handle: handle of socket obtained with udp_bind
|
||
|
|
// addr: ip address of recipient
|
||
|
|
// port: port of recipient
|
||
|
|
// buf: packet content
|
||
|
|
// bufsize: size of packet
|
||
|
|
// return: 1 if packet taken for writing, 0 if this is a bad time
|
||
|
|
int (*udp_write)(jdns_session_t *s, void *app, int handle,
|
||
|
|
const jdns_address_t *addr, int port, unsigned char *buf,
|
||
|
|
int bufsize);
|
||
|
|
} jdns_callbacks_t;
|
||
|
|
|
||
|
|
typedef struct jdns_event
|
||
|
|
{
|
||
|
|
int type; // JDNS_EVENT
|
||
|
|
int id; // query id or publish id
|
||
|
|
|
||
|
|
// for query, this can be SUCCESS, NXDOMAIN, ERROR, or TIMEOUT
|
||
|
|
// for publish, this can be SUCCESS, ERROR, or CONFLICT
|
||
|
|
int status;
|
||
|
|
|
||
|
|
// for query
|
||
|
|
jdns_response_t *response;
|
||
|
|
} jdns_event_t;
|
||
|
|
|
||
|
|
void jdns_event_delete(jdns_event_t *e);
|
||
|
|
|
||
|
|
// jdns_session_new:
|
||
|
|
// callbacks: the struct of callbacks
|
||
|
|
// return: newly allocated session
|
||
|
|
jdns_session_t *jdns_session_new(jdns_callbacks_t *callbacks);
|
||
|
|
|
||
|
|
// jdns_session_delete:
|
||
|
|
// s: session to free
|
||
|
|
// return: nothing
|
||
|
|
void jdns_session_delete(jdns_session_t *s);
|
||
|
|
|
||
|
|
// jdns_init_unicast:
|
||
|
|
// s: session
|
||
|
|
// addr: ip address of interface to bind to. NULL for all
|
||
|
|
// port: port of interface to bind to. 0 for any
|
||
|
|
// return: 1 on success, 0 on failure
|
||
|
|
int jdns_init_unicast(jdns_session_t *s, const jdns_address_t *addr,
|
||
|
|
int port);
|
||
|
|
|
||
|
|
// jdns_init_multicast:
|
||
|
|
// s: session
|
||
|
|
// addr: ip address of interface to bind to. NULL for all
|
||
|
|
// port: port of interface to bind to. 0 for any
|
||
|
|
// addr: multicast address to associate with. cannot be NULL
|
||
|
|
// return: 1 on success, 0 on failure
|
||
|
|
int jdns_init_multicast(jdns_session_t *s, const jdns_address_t *addr,
|
||
|
|
int port, const jdns_address_t *maddr);
|
||
|
|
|
||
|
|
// jdns_shutdown:
|
||
|
|
// s: session
|
||
|
|
// return: nothing
|
||
|
|
void jdns_shutdown(jdns_session_t *s);
|
||
|
|
|
||
|
|
// jdns_set_nameservers:
|
||
|
|
// s: session
|
||
|
|
// nslist: list of nameservers
|
||
|
|
// return nothing
|
||
|
|
void jdns_set_nameservers(jdns_session_t *s,
|
||
|
|
const jdns_nameserverlist_t *nslist);
|
||
|
|
|
||
|
|
// jdns_probe:
|
||
|
|
// s: session
|
||
|
|
// return: nothing
|
||
|
|
void jdns_probe(jdns_session_t *s);
|
||
|
|
|
||
|
|
// jdns_query:
|
||
|
|
// s: session
|
||
|
|
// name: the name to look up
|
||
|
|
// rtype: the record type
|
||
|
|
// return: id of this operation
|
||
|
|
int jdns_query(jdns_session_t *s, const unsigned char *name, int rtype);
|
||
|
|
|
||
|
|
// jdns_cancel_query:
|
||
|
|
// s: session
|
||
|
|
// id: the operation id to cancel
|
||
|
|
// return: nothing
|
||
|
|
void jdns_cancel_query(jdns_session_t *s, int id);
|
||
|
|
|
||
|
|
// jdns_publish:
|
||
|
|
// s: session
|
||
|
|
// mode: JDNS_PUBLISH shared or unique
|
||
|
|
// rec: the record data
|
||
|
|
// return: id of this operation
|
||
|
|
// note: supported record types: A, AAAA, SRV, CNAME, PTR, TXT, and HINFO.
|
||
|
|
// if the published type is not one of these, raw rdata must be set.
|
||
|
|
int jdns_publish(jdns_session_t *s, int mode, const jdns_rr_t *rec);
|
||
|
|
|
||
|
|
// jdns_update_publish:
|
||
|
|
// s: session
|
||
|
|
// id: the operation id to update
|
||
|
|
// rec: the record data
|
||
|
|
// return: nothing
|
||
|
|
void jdns_update_publish(jdns_session_t *s, int id, const jdns_rr_t *rec);
|
||
|
|
|
||
|
|
// jdns_cancel_publish:
|
||
|
|
// s: session
|
||
|
|
// id: the operation id to cancel
|
||
|
|
// return: nothing
|
||
|
|
void jdns_cancel_publish(jdns_session_t *s, int id);
|
||
|
|
|
||
|
|
// jdns_step:
|
||
|
|
// s: session
|
||
|
|
// return: JDNS_STEP flags OR'd together
|
||
|
|
int jdns_step(jdns_session_t *s);
|
||
|
|
|
||
|
|
// jdns_next_timer:
|
||
|
|
// s: session
|
||
|
|
// return: milliseconds until timeout
|
||
|
|
int jdns_next_timer(jdns_session_t *s);
|
||
|
|
|
||
|
|
// jdns_set_handle_readable:
|
||
|
|
// s: session
|
||
|
|
// handle: handle that is now readable
|
||
|
|
// return: nothing
|
||
|
|
void jdns_set_handle_readable(jdns_session_t *s, int handle);
|
||
|
|
|
||
|
|
// jdns_set_handle_writable:
|
||
|
|
// s: session
|
||
|
|
// handle: handle that is now writable
|
||
|
|
// return: nothing
|
||
|
|
void jdns_set_handle_writable(jdns_session_t *s, int handle);
|
||
|
|
|
||
|
|
// jdns_next_event:
|
||
|
|
// s: session
|
||
|
|
// return: newly allocated event, or zero if none are ready
|
||
|
|
jdns_event_t *jdns_next_event(jdns_session_t *s);
|
||
|
|
|
||
|
|
// jdns_system_dnsparams:
|
||
|
|
// return: newly allocated dnsparams from the system
|
||
|
|
jdns_dnsparams_t *jdns_system_dnsparams();
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|