/** * * /brief getdns contect management functions * * This is the meat of the API * Originally taken from the getdns API description pseudo implementation. * */ /* The MIT License (MIT) * Copyright (c) 2013 Verisign, Inc. * * 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. */ #include "types-internal.h" #include "util-internal.h" #include #include /* useful macros */ #define gd_malloc(sz) context->memory_allocator(sz) #define gd_free(ptr) context->memory_deallocator(ptr) void network_req_free(getdns_network_req* net_req) { if (!net_req) { return; } getdns_context_t context = net_req->owner->context; if (net_req->result) { ldns_pkt_free(net_req->result); } gd_free(net_req); } getdns_network_req* network_req_new(getdns_dns_req* owner, uint16_t request_type, uint16_t request_class, struct getdns_dict* extensions) { getdns_context_t context = owner->context; getdns_network_req* net_req = gd_malloc(sizeof(getdns_network_req)); if (!net_req) { return NULL; } net_req->result = NULL; net_req->next = NULL; net_req->request_type = request_type; net_req->request_class = request_class; net_req->unbound_id = -1; net_req->state = NET_REQ_NOT_SENT; net_req->owner = owner; /* TODO: records and other extensions */ return net_req; } void dns_req_free(getdns_dns_req* req) { if (!req) { return; } getdns_network_req *net_req = NULL; getdns_context_t context = req->context; /* free network requests */ net_req = req->first_req; while (net_req) { getdns_network_req *next = net_req->next; network_req_free(net_req); net_req = next; } /* cleanup timeout */ if (req->timeout) { event_del(req->timeout); event_free(req->timeout); } /* free strduped name */ free(req->name); gd_free(req); } /* create a new dns req to be submitted */ getdns_dns_req* dns_req_new(getdns_context_t context, struct ub_ctx* unbound, const char* name, uint16_t request_type, struct getdns_dict *extensions) { getdns_dns_req *result = NULL; getdns_network_req *req = NULL; getdns_return_t r; uint32_t both = GETDNS_EXTENSION_FALSE; result = gd_malloc(sizeof(getdns_dns_req)); if (result == NULL) { return NULL; } result->name = strdup(name); result->context = context; result->unbound = unbound; result->canceled = 0; result->current_req = NULL; result->first_req = NULL; result->trans_id = ldns_get_random(); result->timeout = NULL; getdns_dict_copy(extensions, &result->extensions); /* will be set by caller */ result->user_pointer = NULL; result->user_callback = NULL; /* create the requests */ req = network_req_new(result, request_type, LDNS_RR_CLASS_IN, extensions); if (!req) { dns_req_free(result); return NULL; } result->current_req = req; result->first_req = req; /* tack on A or AAAA if needed */ r = getdns_dict_get_int(extensions, GETDNS_STR_EXTENSION_RETURN_BOTH_V4_AND_V6, &both); if (r == GETDNS_RETURN_GOOD && both == GETDNS_EXTENSION_TRUE && (request_type == GETDNS_RRTYPE_A || request_type == GETDNS_RRTYPE_AAAA)) { uint16_t next_req_type = (request_type == GETDNS_RRTYPE_A) ? GETDNS_RRTYPE_AAAA : GETDNS_RRTYPE_A; getdns_network_req* next_req = network_req_new(result, next_req_type, LDNS_RR_CLASS_IN, extensions); if (!next_req) { dns_req_free(result); return NULL; } req->next = next_req; } return result; }