Initial implementation of an async DNS client API with getaddrinfo + pthreads.
This commit is contained in:
Jan Vidar Krey
parent
19559f4974
commit
793790d089
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@ -83,10 +83,6 @@ if (SQLITE_SUPPORT)
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target_link_libraries(mod_auth_sqlite sqlite3 utils)
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target_link_libraries(uhub-passwd sqlite3 utils)
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set_target_properties(mod_auth_sqlite PROPERTIES PREFIX "")
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if (UNIX)
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target_link_libraries(uhub pthread)
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endif()
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endif()
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@ -121,11 +117,12 @@ target_link_libraries(mod_logging network)
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if(UNIX)
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add_library(adcclient STATIC ${adcclient_SOURCES})
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add_executable(uhub-admin ${PROJECT_SOURCE_DIR}/tools/admin.c)
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target_link_libraries(uhub-admin adcclient adc network utils)
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target_link_libraries(uhub-admin adcclient adc network utils pthread)
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target_link_libraries(uhub pthread)
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if (ADC_STRESS)
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add_executable(adcrush ${PROJECT_SOURCE_DIR}/tools/adcrush.c ${adcclient_SOURCES})
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target_link_libraries(adcrush adcclient adc network utils)
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target_link_libraries(adcrush adcclient adc network utils pthread)
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endif()
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endif()
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@ -146,6 +146,9 @@ int net_backend_process()
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return 0;
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}
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// Process pending DNS results
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net_dns_process();
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g_backend->handler.backend_process(g_backend->data, res);
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net_cleanup_process(g_backend->cleaner);
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@ -0,0 +1,383 @@
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/*
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* uhub - A tiny ADC p2p connection hub
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* Copyright (C) 2007-2012, Jan Vidar Krey
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "uhub.h"
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#define DEBUG_LOOKUP_TIME 1
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#define MAX_CONCURRENT_JOBS 25
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static struct net_dns_job* find_and_remove_job(struct net_dns_job* job);
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static struct net_dns_result* find_and_remove_result(struct net_dns_job* job);
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struct net_dns_job
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{
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net_dns_job_cb callback;
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void* ptr;
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char* host;
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int af;
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#ifdef DEBUG_LOOKUP_TIME
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struct timeval time_start;
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struct timeval time_finish;
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#endif
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#ifdef POSIX_THREAD_SUPPORT
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pthread_t thread_handle;
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#endif
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};
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struct net_dns_result
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{
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struct linked_list* addr_list;
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struct net_dns_job* job;
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};
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static void free_job(struct net_dns_job* job)
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{
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if (job)
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{
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hub_free(job->host);
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hub_free(job);
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}
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}
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// NOTE: Any job manipulating the members of this
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// struct must lock the mutex!
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struct net_dns_subsystem
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{
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struct linked_list* jobs; // currently running jobs
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struct linked_list* results; // queue of results that are awaiting being delivered to callback.
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#ifdef POSIX_THREAD_SUPPORT
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pthread_mutex_t mutex;
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#endif // POSIX_THREAD_SUPPORT
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};
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static struct net_dns_subsystem* g_dns = NULL;
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void net_dns_initialize()
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{
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LOG_TRACE("net_dns_initialize()");
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g_dns = (struct net_dns_subsystem*) hub_malloc_zero(sizeof(struct net_dns_subsystem));
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g_dns->jobs = list_create();
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g_dns->results = list_create();
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#ifdef POSIX_THREAD_SUPPORT
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pthread_mutex_init(&g_dns->mutex, NULL);
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#endif
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}
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void net_dns_destroy()
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{
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#ifdef POSIX_THREAD_SUPPORT
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struct net_dns_job* job;
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pthread_mutex_lock(&g_dns->mutex);
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LOG_TRACE("net_dns_destroy(): jobs=%d", (int) list_size(g_dns->jobs));
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job = (struct net_dns_job*) list_get_first(g_dns->jobs);
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pthread_mutex_unlock(&g_dns->mutex);
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while (job)
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{
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net_dns_job_cancel(job);
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pthread_mutex_lock(&g_dns->mutex);
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job = (struct net_dns_job*) list_get_first(g_dns->jobs);
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pthread_mutex_unlock(&g_dns->mutex);
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}
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#endif
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}
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#ifdef POSIX_THREAD_SUPPORT
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static void dummy_free(void* ptr)
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{
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}
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#endif
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void net_dns_process()
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{
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#ifdef POSIX_THREAD_SUPPORT
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struct net_dns_result* result;
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pthread_mutex_lock(&g_dns->mutex);
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LOG_DUMP("net_dns_process(): jobs=%d, results=%d", (int) list_size(g_dns->jobs), (int) list_size(g_dns->results));
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for (result = (struct net_dns_result*) list_get_first(g_dns->results); result; result = (struct net_dns_result*) list_get_next(g_dns->results))
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{
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struct net_dns_job* job = result->job;
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#ifdef DEBUG_LOOKUP_TIME
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struct timeval time_result;
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timersub(&result->job->time_finish, &result->job->time_start, &time_result);
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LOG_TRACE("DNS lookup took %d ms", (time_result.tv_sec * 1000) + (time_result.tv_usec / 1000));
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#endif
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// wait for the work thread to finish
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pthread_join(job->thread_handle, NULL);
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// callback - should we delete the data immediately?
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if (job->callback(job, result))
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{
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net_dns_result_free(result);
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}
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else
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{
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/* Caller wants to keep the result data, and
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* thus needs to call net_dns_result_free() to release it later.
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* We only clean up the job data here and keep the results intact.
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*/
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result->job = NULL;
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free_job(job);
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}
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}
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list_clear(g_dns->results, &dummy_free);
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pthread_mutex_unlock(&g_dns->mutex);
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#endif // POSIX_THREAD_SUPPORT
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}
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#ifdef POSIX_THREAD_SUPPORT
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static void* job_thread_resolve_name(void* ptr)
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{
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struct net_dns_job* job = (struct net_dns_job*) ptr;
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struct addrinfo hints, *result, *it;
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struct net_dns_result* dns_results;
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int ret;
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = job->af;
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hints.ai_protocol = IPPROTO_TCP;
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ret = getaddrinfo(job->host, NULL, &hints, &result);
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if (ret != 0)
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{
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LOG_WARN("getaddrinfo() failed: %s", gai_strerror(ret));
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return NULL;
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}
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dns_results = (struct net_dns_result*) hub_malloc(sizeof(struct net_dns_result));
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dns_results->addr_list = list_create();
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dns_results->job = job;
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for (it = result; it; it = it->ai_next)
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{
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struct ip_addr_encap* ipaddr = hub_malloc_zero(sizeof(struct ip_addr_encap));
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ipaddr->af = it->ai_family;
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if (it->ai_family == AF_INET)
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{
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struct sockaddr_in* addr4 = (struct sockaddr_in*) it->ai_addr;
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memcpy(&ipaddr->internal_ip_data.in, &addr4->sin_addr, sizeof(struct in_addr));
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}
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else if (it->ai_family == AF_INET6)
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{
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struct sockaddr_in6* addr6 = (struct sockaddr_in6*) it->ai_addr;
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memcpy(&ipaddr->internal_ip_data.in6, &addr6->sin6_addr, sizeof(struct in6_addr));
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}
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else
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{
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LOG_WARN("getaddrinfo() returned result with unknown address family: %d", it->ai_family);
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hub_free(ipaddr);
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continue;
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}
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LOG_WARN("getaddrinfo() - Address (%d): %s", ret++, ip_convert_to_string(ipaddr));
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list_append(dns_results->addr_list, ipaddr);
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}
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freeaddrinfo(result);
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#ifdef DEBUG_LOOKUP_TIME
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gettimeofday(&job->time_finish, NULL);
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#endif
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pthread_mutex_lock(&g_dns->mutex);
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list_remove(g_dns->jobs, job);
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list_append(g_dns->results, dns_results);
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pthread_mutex_unlock(&g_dns->mutex);
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return dns_results;
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}
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#endif
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extern struct net_dns_job* net_dns_gethostbyname(const char* host, int af, net_dns_job_cb callback, void* ptr)
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{
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struct net_dns_job* job = (struct net_dns_job*) hub_malloc_zero(sizeof(struct net_dns_job));
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job->host = strdup(host);
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job->af = af;
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job->callback = callback;
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job->ptr = ptr;
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#ifdef DEBUG_LOOKUP_TIME
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gettimeofday(&job->time_start, NULL);
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#endif
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// FIXME - scheduling - what about a max number of threads?
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#ifdef POSIX_THREAD_SUPPORT
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pthread_mutex_lock(&g_dns->mutex);
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int err = pthread_create(&job->thread_handle, NULL, job_thread_resolve_name, job);
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if (err)
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{
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LOG_WARN("Unable to create thread: (%d) %s", err, strerror(err));
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free_job(job);
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job = NULL;
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}
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else
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{
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list_append(g_dns->jobs, job);
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}
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pthread_mutex_unlock(&g_dns->mutex);
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#endif
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return job;
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}
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extern struct net_dns_job* net_dns_gethostbyaddr(struct ip_addr_encap* ipaddr, net_dns_job_cb callback, void* ptr)
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{
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struct net_dns_job* job = (struct net_dns_job*) hub_malloc_zero(sizeof(struct net_dns_job));
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// job->host = strdup(addr);
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job->af = ipaddr->af;
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job->callback = callback;
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job->ptr = ptr;
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#ifdef POSIX_THREAD_SUPPORT
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// if (pthread_create(&job->thread_handle, NULL, start_job, job))
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// {
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// free_job(job);
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// return NULL;
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// }
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#endif
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return job;
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}
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// NOTE: mutex must be locked first!
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static struct net_dns_job* find_and_remove_job(struct net_dns_job* job)
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{
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struct net_dns_job* it;
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for (it = (struct net_dns_job*) list_get_first(g_dns->jobs); it; it = (struct net_dns_job*) list_get_next(g_dns->jobs))
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{
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if (it == job)
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{
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list_remove(g_dns->jobs, it);
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return job;
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}
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}
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return NULL;
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}
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// NOTE: mutex must be locked first!
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static struct net_dns_result* find_and_remove_result(struct net_dns_job* job)
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{
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struct net_dns_result* it;
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for (it = (struct net_dns_result*) list_get_first(g_dns->results); it; it = (struct net_dns_result*) list_get_next(g_dns->results))
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{
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if (it->job == job)
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{
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list_remove(g_dns->results, it);
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return it;
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}
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}
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return NULL;
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}
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extern int net_dns_job_cancel(struct net_dns_job* job)
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{
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#ifdef POSIX_THREAD_SUPPORT
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int retval = 0;
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struct net_dns_result* res;
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LOG_TRACE("net_dns_job_cancel(): job=%p, name=%s", job, job->host);
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/*
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* This function looks up the job in the jobs queue (which contains only active jobs)
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* If that is found then the thread is cancelled, and the object is deleted.
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* If the job was not found, that is either because it was an invalid job, or because
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* it was already finished. At which point it was not deleted.
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* If the job is already finished, but the result has not been delivered, then this
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* deletes the result and the job.
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*/
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pthread_mutex_lock(&g_dns->mutex);
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if (find_and_remove_job(job))
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{
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// job still active - cancel it, then close it.
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pthread_cancel(job->thread_handle);
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pthread_join(job->thread_handle, NULL);
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free_job(job);
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retval = 1;
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}
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else if ((res = find_and_remove_result(job)))
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{
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// job already finished - close it.
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pthread_join(job->thread_handle, NULL);
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net_dns_result_free(res);
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}
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pthread_mutex_unlock(&g_dns->mutex);
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return retval;
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#endif
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}
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extern struct net_dns_result* net_dns_job_sync_wait(struct net_dns_job* job)
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{
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struct net_dns_result* res = NULL;
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// Wait for job to finish (if not already)
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// This should make sure the job is removed from jobs and a result is
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// present in results.
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pthread_join(job->thread_handle, NULL);
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// Remove the result in order to prevent the callback from being called.
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pthread_mutex_lock(&g_dns->mutex);
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res = find_and_remove_result(job);
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uhub_assert(res != NULL);
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res->job = NULL;
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free_job(job);
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pthread_mutex_unlock(&g_dns->mutex);
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return res;
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}
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void* net_dns_job_get_ptr(const struct net_dns_job* job)
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{
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return job->ptr;
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}
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extern size_t net_dns_result_size(const struct net_dns_result* res)
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{
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return list_size(res->addr_list);
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}
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extern struct ip_addr_encap* net_dns_result_first(const struct net_dns_result* res)
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{
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struct ip_addr_encap* ipaddr = list_get_first(res->addr_list);
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LOG_TRACE("net_dns_result_first() - Address: %s", ip_convert_to_string(ipaddr));
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return ipaddr;
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}
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extern struct ip_addr_encap* net_dns_result_next(const struct net_dns_result* res)
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{
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struct ip_addr_encap* ipaddr = list_get_next(res->addr_list);
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LOG_TRACE("net_dns_result_next() - Address: %s", ip_convert_to_string(ipaddr));
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return ipaddr;
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}
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extern void net_dns_result_free(struct net_dns_result* res)
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{
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list_clear(res->addr_list, &hub_free);
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list_destroy(res->addr_list);
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free_job(res->job);
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hub_free(res);
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}
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@ -0,0 +1,119 @@
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/*
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* uhub - A tiny ADC p2p connection hub
|
||||
* Copyright (C) 2007-2012, Jan Vidar Krey
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||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 3 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef HAVE_UHUB_NETWORK_DNS_RESOLVER_H
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#define HAVE_UHUB_NETWORK_DNS_RESOLVER_H
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struct net_dns_job;
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struct net_dns_result;
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// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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/// Initialize the DNS subsystem
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void net_dns_initialize();
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/// Shutdown and destroy the DNS subsystem. This will cancel any pending DNS jobs.
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void net_dns_destroy();
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/// Process finished DNS lookups.
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void net_dns_process();
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// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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// ----------------------------------------------------------------------------
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/**
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* Callback to be called when the DNS job has finished.
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* If the name or address could not be resolved to an IP address (host not found, or found but has no address)
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* then 'result' contains an empty list (@see net_dns_result_size()).
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* If resolving caused an error then result is NULL.
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*
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||||
* After this callback is called the job is considered done, and is freed.
|
||||
*
|
||||
* @param If 1 is returned then result is deleted immediately after the callback,
|
||||
* otherwise the callback becomes owner of the result data which must be freed with net_dns_result_free().
|
||||
*/
|
||||
typedef int (*net_dns_job_cb)(struct net_dns_job*, const struct net_dns_result* result);
|
||||
|
||||
/**
|
||||
* Resolve a hostname.
|
||||
*
|
||||
* @param host the hostname to be resolved.
|
||||
* @param af the indicated address family. Should be AF_INET, AF_INET6 (or AF_UNSPEC - which means both AF_INET and AF_INET6.
|
||||
* @param callback the callback to be called when the hostname has been resolved.
|
||||
* @param ptr A user-defined pointer value.
|
||||
*
|
||||
* @return A resolve job handle if the job has successfully started or NULL if unable to start resolving.
|
||||
*/
|
||||
extern struct net_dns_job* net_dns_gethostbyname(const char* host, int af, net_dns_job_cb callback, void* ptr);
|
||||
|
||||
/**
|
||||
* Perform a reverse DNS lookup for a given IP address.
|
||||
*
|
||||
* @see net_dns_gethostbyname()
|
||||
* @return A resolve job handle if the job has successfully started or NULL if unable to start resolving.
|
||||
*/
|
||||
extern struct net_dns_job* net_dns_gethostbyaddr(struct ip_addr_encap* ipaddr, net_dns_job_cb callback, void* ptr);
|
||||
|
||||
/**
|
||||
* Cancel a DNS lookup job.
|
||||
*
|
||||
* It is only allowed to call this once after a job has been started (@see net_dns_gethostbyname(), @see net_dns_gethostbyaddr())
|
||||
* but before it has finished and delivered a to the callback address (@see net_dns_job_cb).
|
||||
*
|
||||
* @returns 1 if cancelled, or 0 if not cancelled (because the job was not found!)
|
||||
*/
|
||||
extern int net_dns_job_cancel(struct net_dns_job* job);
|
||||
|
||||
/**
|
||||
* Wait in a synchronous manner for a running DNS job to finished and
|
||||
* return the result here.
|
||||
* The job must be started with net_dns_gethostbyaddr/net_dns_gethostbyname
|
||||
* and not finished or cancelled.
|
||||
*
|
||||
* If this function is invoked then the callback function will not be called and
|
||||
* can therefore be NULL.
|
||||
*
|
||||
* <code>
|
||||
* struct net_dns_job* job = net_dns_gethostbyname("www.example.com", AF_INET, NULL, NULL);
|
||||
* struct net_dns_result* net_dns_job_sync_wait(job);
|
||||
* </code>
|
||||
*/
|
||||
extern struct net_dns_result* net_dns_job_sync_wait(struct net_dns_job* job);
|
||||
|
||||
/**
|
||||
* Returns the user specified pointer assigned to the resolving job
|
||||
*/
|
||||
extern void* net_dns_job_get_ptr(const struct net_dns_job* job);
|
||||
|
||||
/// Returns the number of results provided. This is 0 if the host could not be found (or has no matching IP address).
|
||||
extern size_t net_dns_result_size(const struct net_dns_result*);
|
||||
|
||||
/// Returns the first result (if net_dns_result_size > 0), or NULL if not first result exists.
|
||||
extern struct ip_addr_encap* net_dns_result_first(const struct net_dns_result*);
|
||||
|
||||
/// Returns the next result or NULL if no next result exists.
|
||||
extern struct ip_addr_encap* net_dns_result_next(const struct net_dns_result*);
|
||||
|
||||
/// When finished with the results
|
||||
extern void net_dns_result_free(struct net_dns_result*);
|
||||
|
||||
#endif /* HAVE_UHUB_NETWORK_DNS_RESOLVER_H */
|
||||
|
|
@ -60,6 +60,9 @@ int net_initialize()
|
|||
#endif
|
||||
return -1;
|
||||
}
|
||||
|
||||
net_dns_initialize();
|
||||
|
||||
net_stats_initialize();
|
||||
net_initialized = 1;
|
||||
return 0;
|
||||
|
|
@ -94,6 +97,8 @@ int net_destroy()
|
|||
{
|
||||
LOG_TRACE("Shutting down network monitor");
|
||||
|
||||
net_dns_destroy();
|
||||
|
||||
net_backend_shutdown();
|
||||
|
||||
#ifdef SSL_SUPPORT
|
||||
|
|
@ -490,7 +495,6 @@ int net_socket_create(int af, int type, int protocol)
|
|||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
return sd;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -113,11 +113,13 @@
|
|||
#define uhub_assert assert
|
||||
|
||||
#ifdef __linux__
|
||||
#define POSIX_THREAD_SUPPORT
|
||||
#define USE_EPOLL
|
||||
#include <sys/epoll.h>
|
||||
#endif
|
||||
|
||||
#ifdef BSD_LIKE
|
||||
#define POSIX_THREAD_SUPPORT
|
||||
/*
|
||||
#define USE_KQUEUE
|
||||
#include <sys/event.h>
|
||||
|
|
@ -279,6 +281,10 @@ typedef unsigned __int64 uint64_t;
|
|||
#define NEED_GETOPT
|
||||
#endif
|
||||
|
||||
#ifdef POSIX_THREAD_SUPPORT
|
||||
#include <pthread.h>
|
||||
#endif
|
||||
|
||||
#if defined(__CYGWIN__) || defined(__MINGW32__) || defined(_MSC_VER)
|
||||
#define PLUGIN_API __declspec(dllexport)
|
||||
#else
|
||||
|
|
|
|||
|
|
@ -74,6 +74,7 @@ extern "C" {
|
|||
|
||||
#include "network/network.h"
|
||||
#include "network/connection.h"
|
||||
#include "network/dnsresolver.h"
|
||||
#include "network/ipcalc.h"
|
||||
#include "network/timeout.h"
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue