Add c-ares. These are the hoops I have to jump through to be able to provide some bootstrap nodes.

.gitmodules

@@ -23,3 +23,6 @@
 	path = deps/openssl_src
 	url = https://github.com/openssl/openssl.git
 	shallow = true
+[submodule "deps/c-ares"]
+	path = deps/c-ares
+	url = https://github.com/c-ares/c-ares.git

GNUmakefile

@@ -248,6 +248,8 @@ APP_SOURCES_ios := $(wildcard src/*.m)
 APP_OBJS := $(call get_objs,APP_SOURCES)
 $(APP_OBJS): CFLAGS += \
 	-Ideps/base64c/include \
+	-Ideps/c-ares/include \
+	-Ideps/c-ares_config \
 	-Ideps/crypt_blowfish \
 	-Ideps/libbacktrace \
 	-Ideps/libsodium \
@@ -266,6 +268,105 @@ $(filter-out $(BUILD_DIR)/android% $(BUILD_DIR)/macos% $(BUILD_DIR)/ios%,$(APP_O
 	-fanalyzer
 endif
 
+ARES_SOURCES := \
+	deps/c-ares/src/lib/ares_platform.c \
+	deps/c-ares/src/lib/record/ares_dns_mapping.c \
+	deps/c-ares/src/lib/record/ares_dns_parse.c \
+	deps/c-ares/src/lib/record/ares_dns_write.c \
+	deps/c-ares/src/lib/record/ares_dns_name.c \
+	deps/c-ares/src/lib/record/ares_dns_record.c \
+	deps/c-ares/src/lib/record/ares_dns_multistring.c \
+	deps/c-ares/src/lib/ares_destroy.c \
+	deps/c-ares/src/lib/ares_data.c \
+	deps/c-ares/src/lib/ares_sysconfig.c \
+	deps/c-ares/src/lib/ares_cancel.c \
+	deps/c-ares/src/lib/ares_metrics.c \
+	deps/c-ares/src/lib/ares_getnameinfo.c \
+	deps/c-ares/src/lib/legacy/ares_parse_txt_reply.c \
+	deps/c-ares/src/lib/legacy/ares_parse_naptr_reply.c \
+	deps/c-ares/src/lib/legacy/ares_create_query.c \
+	deps/c-ares/src/lib/legacy/ares_parse_mx_reply.c \
+	deps/c-ares/src/lib/legacy/ares_parse_srv_reply.c \
+	deps/c-ares/src/lib/legacy/ares_parse_ptr_reply.c \
+	deps/c-ares/src/lib/legacy/ares_parse_caa_reply.c \
+	deps/c-ares/src/lib/legacy/ares_parse_aaaa_reply.c \
+	deps/c-ares/src/lib/legacy/ares_expand_name.c \
+	deps/c-ares/src/lib/legacy/ares_parse_uri_reply.c \
+	deps/c-ares/src/lib/legacy/ares_parse_a_reply.c \
+	deps/c-ares/src/lib/legacy/ares_expand_string.c \
+	deps/c-ares/src/lib/legacy/ares_fds.c \
+	deps/c-ares/src/lib/legacy/ares_parse_ns_reply.c \
+	deps/c-ares/src/lib/legacy/ares_parse_soa_reply.c \
+	deps/c-ares/src/lib/legacy/ares_getsock.c \
+	deps/c-ares/src/lib/windows_port.c \
+	deps/c-ares/src/lib/ares_qcache.c \
+	deps/c-ares/src/lib/ares_update_servers.c \
+	deps/c-ares/src/lib/ares_process.c \
+	deps/c-ares/src/lib/ares_getenv.c \
+	deps/c-ares/src/lib/ares_gethostbyname.c \
+	deps/c-ares/src/lib/ares_send.c \
+	deps/c-ares/src/lib/dsa/ares__slist.c \
+	deps/c-ares/src/lib/dsa/ares__htable.c \
+	deps/c-ares/src/lib/dsa/ares__llist.c \
+	deps/c-ares/src/lib/dsa/ares__htable_szvp.c \
+	deps/c-ares/src/lib/dsa/ares__htable_asvp.c \
+	deps/c-ares/src/lib/dsa/ares__htable_vpvp.c \
+	deps/c-ares/src/lib/dsa/ares__htable_strvp.c \
+	deps/c-ares/src/lib/dsa/ares__array.c \
+	deps/c-ares/src/lib/ares__socket.c \
+	deps/c-ares/src/lib/event/ares_event_poll.c \
+	deps/c-ares/src/lib/event/ares_event_thread.c \
+	deps/c-ares/src/lib/event/ares_event_select.c \
+	deps/c-ares/src/lib/event/ares_event_kqueue.c \
+	deps/c-ares/src/lib/event/ares_event_configchg.c \
+	deps/c-ares/src/lib/event/ares_event_epoll.c \
+	deps/c-ares/src/lib/event/ares_event_wake_pipe.c \
+	deps/c-ares/src/lib/event/ares_event_win32.c \
+	deps/c-ares/src/lib/ares_search.c \
+	deps/c-ares/src/lib/ares__parse_into_addrinfo.c \
+	deps/c-ares/src/lib/ares__hosts_file.c \
+	deps/c-ares/src/lib/ares_getaddrinfo.c \
+	deps/c-ares/src/lib/ares__addrinfo2hostent.c \
+	deps/c-ares/src/lib/ares_freeaddrinfo.c \
+	deps/c-ares/src/lib/ares_strerror.c \
+	deps/c-ares/src/lib/ares_version.c \
+	deps/c-ares/src/lib/ares_gethostbyaddr.c \
+	deps/c-ares/src/lib/ares__addrinfo_localhost.c \
+	deps/c-ares/src/lib/ares_free_hostent.c \
+	deps/c-ares/src/lib/ares__close_sockets.c \
+	deps/c-ares/src/lib/ares_free_string.c \
+	deps/c-ares/src/lib/ares_init.c \
+	deps/c-ares/src/lib/ares_options.c \
+	deps/c-ares/src/lib/str/ares_strcasecmp.c \
+	deps/c-ares/src/lib/str/ares__buf.c \
+	deps/c-ares/src/lib/str/ares_strsplit.c \
+	deps/c-ares/src/lib/str/ares_str.c \
+	deps/c-ares/src/lib/ares_sysconfig_mac.c \
+	deps/c-ares/src/lib/ares__sortaddrinfo.c \
+	deps/c-ares/src/lib/ares_sysconfig_files.c \
+	deps/c-ares/src/lib/util/ares__iface_ips.c \
+	deps/c-ares/src/lib/util/ares__timeval.c \
+	deps/c-ares/src/lib/util/ares_math.c \
+	deps/c-ares/src/lib/util/ares_rand.c \
+	deps/c-ares/src/lib/util/ares__threads.c \
+	deps/c-ares/src/lib/ares_query.c \
+	deps/c-ares/src/lib/ares_cookie.c \
+	deps/c-ares/src/lib/inet_net_pton.c \
+	deps/c-ares/src/lib/inet_ntop.c \
+	deps/c-ares/src/lib/ares_library_init.c \
+	deps/c-ares/src/lib/ares_android.c \
+	deps/c-ares/src/lib/ares_sysconfig_win.c \
+	deps/c-ares/src/lib/ares_timeout.c
+ARES_OBJS := $(call get_objs,ARES_SOURCES)
+$(ARES_OBJS): CFLAGS += \
+	-Ideps/c-ares/include \
+	-Ideps/c-ares/src/lib \
+	-Ideps/c-ares_config/ \
+	-D_GNU_SOURCE \
+	-Wno-unused-function \
+	-Wno-deprecated-declarations \
+	-Wno-unused-result
+
 BLOWFISH_SOURCES := \
 	deps/crypt_blowfish/crypt_blowfish.c \
 	deps/crypt_blowfish/crypt_gensalt.c \
@@ -631,6 +732,7 @@ all: $(BUILD_TYPES)
 
 ALL_APP_OBJS := \
 	$(APP_OBJS) \
+	$(ARES_OBJS) \
 	$(BLOWFISH_OBJS) \
 	$(LIBBACKTRACE_OBJS) \
 	$(MINIUNZIP_OBJS) \

deps/c-ares

@@ -0,0 +1 @@
+Subproject commit caffa5ffb3826cf0926405793361bbad11db3268

deps/c-ares_config/ares_build.h

@@ -0,0 +1,163 @@
+#ifndef __CARES_BUILD_H
+#define __CARES_BUILD_H
+/*
+ * Copyright (C) The c-ares project and its contributors
+ * SPDX-License-Identifier: MIT
+ */
+
+#define CARES_TYPEOF_ARES_SOCKLEN_T socklen_t
+#define CARES_TYPEOF_ARES_SSIZE_T ssize_t
+
+#define CARES_STATICLIB
+
+#ifdef CARES_HAVE_SYS_TYPES_H
+#  include <sys/types.h>
+#endif
+
+#ifdef CARES_HAVE_SYS_SOCKET_H
+#  include <sys/socket.h>
+#endif
+
+#ifdef CARES_HAVE_SYS_SELECT_H
+#  include <sys/select.h>
+#endif
+
+#ifdef CARES_HAVE_WINSOCK2_H
+#  include <winsock2.h>
+#endif
+
+#ifdef CARES_HAVE_WS2TCPIP_H
+#  include <ws2tcpip.h>
+#endif
+
+#ifdef CARES_HAVE_WINDOWS_H
+#  include <windows.h>
+#endif
+
+#if !defined(__ANDROID__) && !defined(__APPLE__) && !defined(_WIN32)
+#define GETSERVBYNAME_R_ARGS 6
+#define GETSERVBYPORT_R_ARGS 6
+#define HAVE_GETSERVBYNAME_R 1
+#define HAVE_GETSERVBYPORT_R 1
+#define HAVE_PIPE2 1
+#endif
+
+#if !defined(__APPLE__) && !defined(_WIN32)
+#define HAVE_MALLOC_H 1
+#define HAVE_EPOLL 1
+#define HAVE_SYS_EPOLL_H 1
+#define HAVE_SYS_RANDOM_H 1
+#endif
+
+#if !defined(__WIN32)
+#undef AC_APPLE_UNIVERSAL_BUILD
+#undef ETC_INET
+#define GETHOSTNAME_TYPE_ARG2 size_t
+#define GETNAMEINFO_QUAL_ARG1 
+#define GETNAMEINFO_TYPE_ARG1 struct sockaddr *
+#define GETNAMEINFO_TYPE_ARG2 socklen_t
+#define GETNAMEINFO_TYPE_ARG46 socklen_t
+#define GETNAMEINFO_TYPE_ARG7 int
+#define HAVE_AF_INET6 1
+#define HAVE_ARPA_INET_H 1
+#define HAVE_ARPA_NAMESER_COMPAT_H 1
+#define HAVE_ARPA_NAMESER_H 1
+#define HAVE_ASSERT_H 1
+#define HAVE_CLOCK_GETTIME_MONOTONIC 1
+#define HAVE_CONNECT 1
+#define HAVE_DLFCN_H 1
+#define HAVE_ERRNO_H 1
+#define HAVE_POLL_H 1
+#define HAVE_POLL 1
+#define HAVE_PIPE 1
+#define HAVE_FCNTL 1
+#define HAVE_FCNTL_H 1
+#define HAVE_FCNTL_O_NONBLOCK 1
+#define HAVE_FREEADDRINFO 1
+#define HAVE_GETADDRINFO 1
+#define HAVE_GETENV 1
+#define HAVE_GETHOSTNAME 1
+#define HAVE_GETNAMEINFO 1
+#define HAVE_GETRANDOM 1
+#define HAVE_GETTIMEOFDAY 1
+#define HAVE_IF_INDEXTONAME 1
+#define HAVE_IF_NAMETOINDEX 1
+#define HAVE_INET_NTOP 1
+#define HAVE_INET_PTON 1
+#define HAVE_INTTYPES_H 1
+#define HAVE_IOCTL 1
+#define HAVE_IOCTL_FIONBIO 1
+#define HAVE_IOCTL_SIOCGIFADDR 1
+#define HAVE_LIMITS_H 1
+#define HAVE_LONGLONG 1
+#define HAVE_MEMORY_H 1
+#define HAVE_MSG_NOSIGNAL 1
+#define HAVE_NETDB_H 1
+#define HAVE_NETINET_IN_H 1
+#define HAVE_NETINET_TCP_H 1
+#define HAVE_NET_IF_H 1
+#define HAVE_PF_INET6 1
+#define HAVE_RECV 1
+#define HAVE_RECVFROM 1
+#define HAVE_SEND 1
+#define HAVE_SETSOCKOPT 1
+#define HAVE_SIGNAL_H 1
+#define HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID 1
+#define HAVE_SOCKET 1
+#define HAVE_STDBOOL_H 1
+#define HAVE_STDINT_H 1
+#define HAVE_STDLIB_H 1
+#define HAVE_STRCASECMP 1
+#define HAVE_STRDUP 1
+#define HAVE_STRINGS_H 1
+#define HAVE_STRING_H 1
+#define HAVE_STRNCASECMP 1
+#define HAVE_STRUCT_ADDRINFO 1
+#define HAVE_STRUCT_IN6_ADDR 1
+#define HAVE_STRUCT_SOCKADDR_IN6 1
+#define HAVE_STRUCT_SOCKADDR_STORAGE 1
+#define HAVE_STRUCT_TIMEVAL 1
+#define HAVE_SYS_IOCTL_H 1
+#define HAVE_SYS_PARAM_H 1
+#define HAVE_SYS_SELECT_H 1
+#define HAVE_SYS_SOCKET_H 1
+#define HAVE_SYS_STAT_H 1
+#define HAVE_SYS_TIME_H 1
+#define HAVE_SYS_TYPES_H 1
+#define HAVE_SYS_UIO_H 1
+#define HAVE_TIME_H 1
+#define HAVE_IFADDRS_H 1
+#define HAVE_UNISTD_H 1
+#define HAVE_WRITEV 1
+#define HAVE_ARC4RANDOM_BUF 1
+#define HAVE_GETIFADDRS 1
+#define HAVE_STAT 1
+#define CARES_RANDOM_FILE "/dev/urandom"
+#define RECVFROM_QUAL_ARG5 
+#define RECVFROM_TYPE_ARG1 int
+#define RECVFROM_TYPE_ARG2 void *
+#define RECVFROM_TYPE_ARG2_IS_VOID 0
+#define RECVFROM_TYPE_ARG3 size_t
+#define RECVFROM_TYPE_ARG4 int
+#define RECVFROM_TYPE_ARG5 struct sockaddr *
+#define RECVFROM_TYPE_ARG5_IS_VOID 0
+#define RECVFROM_TYPE_ARG6 socklen_t *
+#define RECVFROM_TYPE_ARG6_IS_VOID 0
+#define RECVFROM_TYPE_RETV ssize_t
+#define RECV_TYPE_ARG1 int
+#define RECV_TYPE_ARG2 void *
+#define RECV_TYPE_ARG3 size_t
+#define RECV_TYPE_ARG4 int
+#define RECV_TYPE_RETV ssize_t
+#define SEND_TYPE_ARG1 int
+#define SEND_TYPE_ARG2 const void *
+#define SEND_TYPE_ARG3 size_t
+#define SEND_TYPE_ARG4 int
+#define SEND_TYPE_RETV ssize_t
+#undef USE_BLOCKING_SOCKETS
+#undef WIN32_LEAN_AND_MEAN
+#define HAVE_PTHREAD_H 1
+#define CARES_THREADS 1
+#endif
+
+#endif /* __CARES_BUILD_H */