36 #include <netinet/in.h>
38 #include <openssl/asn1.h>
39 #include <openssl/crypto.h>
40 #include <openssl/err.h>
41 #include <openssl/opensslconf.h>
42 #include <openssl/opensslv.h>
43 #include <openssl/safestack.h>
44 #include <openssl/ssl.h>
45 #include <openssl/x509.h>
46 #include <openssl/x509v3.h>
48 #include <openssl/bio.h>
49 #include <openssl/dh.h>
50 #include <openssl/pem.h>
53 #include <openssl/ec.h>
58 #include <sys/socket.h>
72 static void session_instance_destructor(
void *obj)
80 ast_free(i->overflow_buf);
85 static int check_tcptls_cert_name(ASN1_STRING *cert_str,
const char *hostname,
const char *desc)
90 ret = ASN1_STRING_to_UTF8(&str, cert_str);
91 if (ret < 0 || !str) {
95 if (strlen((
char *) str) != ret) {
96 ast_log(LOG_WARNING,
"Invalid certificate %s length (contains NULL bytes?)\n", desc);
99 }
else if (!strcasecmp(hostname, (
char *) str)) {
105 ast_debug(3,
"SSL %s compare s1='%s' s2='%s'\n", desc, hostname, str);
111 static void write_openssl_error_to_log(
void)
117 fp = open_memstream(&buffer, &length);
122 ERR_print_errors_fp(fp);
126 ast_log(LOG_ERROR,
"%.*s\n", (
int) length, buffer);
129 ast_std_free(buffer);
153 ast_log(LOG_ERROR,
"Failed to inhibit privilege escalations; killing connection from peer '%s'\n",
167 ast_log(LOG_ERROR,
"Failed to set user interface status; killing connection from peer '%s'\n",
174 if (tcptls_session->parent->
tls_cfg) {
179 ast_log(LOG_ERROR,
"Unable to set up ssl connection with peer '%s'\n",
192 peer = SSL_get_peer_certificate(ssl);
194 ast_log(LOG_ERROR,
"No SSL certificate to verify from peer '%s'\n",
201 res = SSL_get_verify_result(ssl);
202 if (res != X509_V_OK) {
203 ast_log(LOG_ERROR,
"Certificate from peer '%s' did not verify: %s\n",
205 X509_verify_cert_error_string(res));
213 X509_NAME *name = X509_get_subject_name(peer);
214 STACK_OF(GENERAL_NAME) *alt_names;
221 pos = X509_NAME_get_index_by_NID(name, NID_commonName, pos);
225 str = X509_NAME_ENTRY_get_data(X509_NAME_get_entry(name, pos));
226 if (!check_tcptls_cert_name(str, tcptls_session->parent->
hostname,
"common name")) {
233 alt_names = X509_get_ext_d2i(peer, NID_subject_alt_name, NULL, NULL);
234 if (alt_names != NULL) {
235 int alt_names_count = sk_GENERAL_NAME_num(alt_names);
237 for (pos = 0; pos < alt_names_count; pos++) {
238 const GENERAL_NAME *alt_name = sk_GENERAL_NAME_value(alt_names, pos);
240 if (alt_name->type != GEN_DNS) {
244 if (!check_tcptls_cert_name(alt_name->d.dNSName, tcptls_session->parent->
hostname,
"alt name")) {
250 sk_GENERAL_NAME_pop_free(alt_names, GENERAL_NAME_free);
255 ast_log(LOG_ERROR,
"Certificate common name from peer '%s' did not match (%s)\n",
266 ast_log(LOG_ERROR,
"TLS client failed: Asterisk is compiled without OpenSSL support. Install OpenSSL development headers and rebuild Asterisk after running ./configure\n");
274 return tcptls_session->parent->
worker_fn(tcptls_session);
276 return tcptls_session;
280 void *ast_tcptls_server_root(
void *data)
294 i = ast_wait_for_input(desc->accept_fd, desc->poll_timeout);
303 && errno != EWOULDBLOCK
305 && errno != ECONNABORTED) {
306 ast_log(LOG_ERROR,
"TCP/TLS accept failed: %s\n", strerror(errno));
307 if (errno != EMFILE) {
315 tcptls_session = ao2_alloc(
sizeof(*tcptls_session), session_instance_destructor);
316 if (!tcptls_session) {
322 if (!tcptls_session->overflow_buf) {
330 if (!tcptls_session->
stream) {
336 tcptls_session->parent = desc;
339 tcptls_session->client = 0;
343 ast_log(LOG_ERROR,
"TCP/TLS unable to launch helper thread for peer '%s': %s\n",
350 ast_log(LOG_ERROR,
"TCP/TLS listener thread ended abnormally\n");
353 fd = desc->accept_fd;
354 desc->accept_fd = -1;
362 static void __ssl_setup_certs(
struct ast_tls_config *cfg,
const size_t cert_file_len,
const char *key_type_extension,
const char *key_type)
366 memcpy(cert_file + cert_file_len - 8, key_type_extension, 5);
367 if (access(cert_file, F_OK) == 0) {
368 if (SSL_CTX_use_certificate_chain_file(cfg->ssl_ctx, cert_file) == 0) {
369 ast_log(LOG_WARNING,
"TLS/SSL error loading public %s key (certificate) from <%s>.\n", key_type, cert_file);
370 write_openssl_error_to_log();
371 }
else if (SSL_CTX_use_PrivateKey_file(cfg->ssl_ctx, cert_file, SSL_FILETYPE_PEM) == 0) {
372 ast_log(LOG_WARNING,
"TLS/SSL error loading private %s key from <%s>.\n", key_type, cert_file);
373 write_openssl_error_to_log();
374 }
else if (SSL_CTX_check_private_key(cfg->ssl_ctx) == 0) {
375 ast_log(LOG_WARNING,
"TLS/SSL error matching private %s key and certificate in <%s>.\n", key_type, cert_file);
376 write_openssl_error_to_log();
386 ast_log(LOG_ERROR,
"TLS server failed: Asterisk is compiled without OpenSSL support. Install OpenSSL development headers and rebuild Asterisk after running ./configure\n");
402 SSL_CTX_free(cfg->ssl_ctx);
407 #if !defined(OPENSSL_NO_SSL2) && (OPENSSL_VERSION_NUMBER < 0x10100000L)
409 ast_log(LOG_WARNING,
"Usage of SSLv2 is discouraged due to known vulnerabilities. Please use 'tlsv1' or leave the TLS method unspecified!\n");
410 cfg->ssl_ctx = SSL_CTX_new(SSLv2_client_method());
413 #if !defined(OPENSSL_NO_SSL3_METHOD) && !(defined(OPENSSL_API_COMPAT) && (OPENSSL_API_COMPAT >= 0x10100000L))
415 ast_log(LOG_WARNING,
"Usage of SSLv3 is discouraged due to known vulnerabilities. Please use 'tlsv1' or leave the TLS method unspecified!\n");
416 cfg->ssl_ctx = SSL_CTX_new(SSLv3_client_method());
419 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
420 cfg->ssl_ctx = SSL_CTX_new(TLS_client_method());
423 cfg->ssl_ctx = SSL_CTX_new(TLSv1_client_method());
426 cfg->ssl_ctx = SSL_CTX_new(SSLv23_client_method());
431 cfg->ssl_ctx = SSL_CTX_new(SSLv23_server_method());
435 ast_debug(1,
"Sorry, SSL_CTX_new call returned null...\n");
445 ssl_opts |= SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3;
449 ssl_opts |= SSL_OP_CIPHER_SERVER_PREFERENCE;
453 ssl_opts |= SSL_OP_NO_TLSv1;
455 #if defined(SSL_OP_NO_TLSv1_1) && defined(SSL_OP_NO_TLSv1_2)
457 ssl_opts |= SSL_OP_NO_TLSv1_1;
460 ssl_opts |= SSL_OP_NO_TLSv1_2;
463 ast_log(LOG_WARNING,
"Your version of OpenSSL leaves you potentially vulnerable "
464 "to the SSL BEAST attack. Please upgrade to OpenSSL 1.0.1 or later\n");
467 SSL_CTX_set_options(cfg->ssl_ctx, ssl_opts);
469 SSL_CTX_set_verify(cfg->ssl_ctx,
470 ast_test_flag(&cfg->flags,
AST_SSL_VERIFY_CLIENT) ? SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT : SSL_VERIFY_NONE,
473 if (!ast_strlen_zero(cfg->certfile)) {
474 char *tmpprivate = ast_strlen_zero(cfg->pvtfile) ? cfg->certfile : cfg->pvtfile;
475 if (SSL_CTX_use_certificate_chain_file(cfg->ssl_ctx, cfg->certfile) == 0) {
478 ast_log(LOG_ERROR,
"TLS/SSL error loading cert file. <%s>\n", cfg->certfile);
479 write_openssl_error_to_log();
481 SSL_CTX_free(cfg->ssl_ctx);
486 if ((SSL_CTX_use_PrivateKey_file(cfg->ssl_ctx, tmpprivate, SSL_FILETYPE_PEM) == 0) || (SSL_CTX_check_private_key(cfg->ssl_ctx) == 0 )) {
489 ast_log(LOG_ERROR,
"TLS/SSL error loading private key file. <%s>\n", tmpprivate);
490 write_openssl_error_to_log();
492 SSL_CTX_free(cfg->ssl_ctx);
498 size_t certfile_len = strlen(cfg->certfile);
503 if (certfile_len >= 8 && !strncmp(cfg->certfile + certfile_len - 8,
"_rsa.", 5)) {
504 __ssl_setup_certs(cfg, certfile_len,
"_ecc.",
"ECC");
505 __ssl_setup_certs(cfg, certfile_len,
"_dsa.",
"DSA");
509 if (!ast_strlen_zero(cfg->cipher)) {
510 if (SSL_CTX_set_cipher_list(cfg->ssl_ctx, cfg->cipher) == 0 ) {
512 ast_log(LOG_ERROR,
"TLS/SSL cipher error <%s>\n", cfg->cipher);
513 write_openssl_error_to_log();
515 SSL_CTX_free(cfg->ssl_ctx);
521 if (!ast_strlen_zero(cfg->cafile) || !ast_strlen_zero(cfg->capath)) {
522 if (SSL_CTX_load_verify_locations(cfg->ssl_ctx,
S_OR(cfg->cafile, NULL),
S_OR(cfg->capath,NULL)) == 0) {
523 ast_log(LOG_ERROR,
"TLS/SSL CA file(%s)/path(%s) error\n", cfg->cafile, cfg->capath);
524 write_openssl_error_to_log();
528 #ifndef OPENSSL_NO_DH
529 if (!ast_strlen_zero(cfg->pvtfile)) {
530 BIO *bio = BIO_new_file(cfg->pvtfile,
"r");
532 DH *dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
534 if (SSL_CTX_set_tmp_dh(cfg->ssl_ctx, dh)) {
535 long options = SSL_OP_CIPHER_SERVER_PREFERENCE | SSL_OP_SINGLE_DH_USE | SSL_OP_SINGLE_ECDH_USE;
536 options = SSL_CTX_set_options(cfg->ssl_ctx, options);
537 ast_verb(2,
"TLS/SSL DH initialized, PFS cipher-suites enabled\n");
546 #ifndef SSL_CTRL_SET_ECDH_AUTO
547 #define SSL_CTRL_SET_ECDH_AUTO 94
550 if (SSL_CTX_ctrl(cfg->ssl_ctx, SSL_CTRL_SET_ECDH_AUTO, 1, NULL)) {
551 ast_verb(2,
"TLS/SSL ECDH initialized (automatic), faster PFS ciphers enabled\n");
552 #if !defined(OPENSSL_NO_ECDH) && (OPENSSL_VERSION_NUMBER >= 0x10000000L) && (OPENSSL_VERSION_NUMBER < 0x10100000L)
555 EC_KEY *ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
557 if (SSL_CTX_set_tmp_ecdh(cfg->ssl_ctx, ecdh)) {
558 ast_verb(2,
"TLS/SSL ECDH initialized (secp256r1), faster PFS cipher-suites enabled\n");
565 ast_verb(2,
"TLS/SSL certificate ok\n");
572 return __ssl_setup(cfg, 0);
578 if (cfg && cfg->ssl_ctx) {
579 SSL_CTX_free(cfg->ssl_ctx);
601 static int socket_connect(
int sockfd,
const struct ast_sockaddr *addr,
int timeout)
604 socklen_t optlen =
sizeof(int);
616 if (errno != EINPROGRESS) {
620 while ((res = ast_wait_for_output(sockfd, timeout)) != 1) {
626 if (errno != EINTR) {
633 if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, &optlen) < 0) {
650 if (!(desc = tcptls_session->parent)) {
655 if (socket_connect(desc->accept_fd, &desc->remote_address, timeout)) {
656 ast_log(LOG_WARNING,
"Unable to connect %s to %s: %s\n", desc->name,
685 || !ast_strlen_zero(desc->
hostname));
689 ast_debug(1,
"Nothing changed in %s\n", desc->name);
697 AF_INET6 : AF_INET, SOCK_STREAM, IPPROTO_TCP);
698 if (desc->accept_fd < 0) {
699 ast_log(LOG_ERROR,
"Unable to allocate socket for %s: %s\n",
700 desc->name, strerror(errno));
708 setsockopt(desc->accept_fd, SOL_SOCKET, SO_REUSEADDR, &x,
sizeof(x));
709 if (
ast_bind(desc->accept_fd, &desc->local_address)) {
710 ast_log(LOG_ERROR,
"Unable to bind %s to %s: %s\n",
718 tcptls_session = ao2_alloc(
sizeof(*tcptls_session), session_instance_destructor);
719 if (!tcptls_session) {
724 if (!tcptls_session->overflow_buf) {
727 tcptls_session->client = 1;
729 if (!tcptls_session->
stream) {
736 tcptls_session->parent = desc;
737 tcptls_session->parent->
worker_fn = NULL;
739 &desc->remote_address);
744 if (!ast_strlen_zero(desc->
hostname)) {
746 ast_log(LOG_WARNING,
"Unable to set SNI hostname '%s' on connection '%s'\n",
751 return tcptls_session;
754 close(desc->accept_fd);
755 desc->accept_fd = -1;
756 ao2_cleanup(tcptls_session);
779 memcpy(desc->
tls_cfg->certhash, hash, 41);
787 memcpy(desc->
tls_cfg->pvthash, hash, 41);
795 memcpy(desc->
tls_cfg->cahash, hash, 41);
816 ast_debug(1,
"Changed parameters for %s found\n", desc->name);
822 ast_debug(1,
"Nothing changed in %s\n", desc->name);
830 if (desc->
master != AST_PTHREADT_NULL) {
831 pthread_cancel(desc->
master);
832 pthread_kill(desc->
master, SIGURG);
833 pthread_join(desc->
master, NULL);
836 sd_socket =
ast_sd_get_fd(SOCK_STREAM, &desc->local_address);
838 if (sd_socket != -1) {
839 if (desc->accept_fd != sd_socket) {
840 if (desc->accept_fd != -1) {
841 close(desc->accept_fd);
843 desc->accept_fd = sd_socket;
846 goto systemd_socket_activation;
849 if (desc->accept_fd != -1) {
850 close(desc->accept_fd);
851 desc->accept_fd = -1;
856 ast_debug(2,
"Server disabled: %s\n", desc->name);
861 AF_INET6 : AF_INET, SOCK_STREAM, 0);
862 if (desc->accept_fd < 0) {
863 ast_log(LOG_ERROR,
"Unable to allocate socket for %s: %s\n", desc->name, strerror(errno));
867 setsockopt(desc->accept_fd, SOL_SOCKET, SO_REUSEADDR, &x,
sizeof(x));
868 if (
ast_bind(desc->accept_fd, &desc->local_address)) {
869 ast_log(LOG_ERROR,
"Unable to bind %s to %s: %s\n",
875 if (listen(desc->accept_fd, 10)) {
876 ast_log(LOG_ERROR,
"Unable to listen for %s!\n", desc->name);
880 systemd_socket_activation:
881 if (ast_pthread_create_background(&desc->
master, NULL, desc->
accept_fn, desc)) {
882 ast_log(LOG_ERROR,
"Unable to launch thread for %s on %s: %s\n",
911 close(desc->accept_fd);
912 desc->accept_fd = -1;
917 if (tcptls_session->
stream) {
919 tcptls_session->
stream = NULL;
921 ast_debug(1,
"ast_tcptls_close_session_file invoked on session instance without file or file descriptor\n");
927 if (desc->
master != AST_PTHREADT_NULL) {
928 pthread_cancel(desc->
master);
929 pthread_kill(desc->
master, SIGURG);
930 pthread_join(desc->
master, NULL);
931 desc->
master = AST_PTHREADT_NULL;
933 if (desc->accept_fd != -1) {
934 close(desc->accept_fd);
936 desc->accept_fd = -1;
948 ast_debug(2,
"Stopped server :: %s\n", desc->name);
953 if (!strcasecmp(varname,
"tlsenable") || !strcasecmp(varname,
"sslenable")) {
954 tls_cfg->enabled =
ast_true(value) ? 1 : 0;
955 }
else if (!strcasecmp(varname,
"tlscertfile") || !strcasecmp(varname,
"sslcert") || !strcasecmp(varname,
"tlscert")) {
956 ast_free(tls_cfg->certfile);
958 }
else if (!strcasecmp(varname,
"tlsprivatekey") || !strcasecmp(varname,
"sslprivatekey")) {
959 ast_free(tls_cfg->pvtfile);
961 }
else if (!strcasecmp(varname,
"tlscipher") || !strcasecmp(varname,
"sslcipher")) {
962 ast_free(tls_cfg->cipher);
964 }
else if (!strcasecmp(varname,
"tlscafile")) {
965 ast_free(tls_cfg->cafile);
967 }
else if (!strcasecmp(varname,
"tlscapath") || !strcasecmp(varname,
"tlscadir")) {
968 ast_free(tls_cfg->capath);
970 }
else if (!strcasecmp(varname,
"tlsverifyclient")) {
972 }
else if (!strcasecmp(varname,
"tlsdontverifyserver")) {
974 }
else if (!strcasecmp(varname,
"tlsbindaddr") || !strcasecmp(varname,
"sslbindaddr")) {
975 if (
ast_parse_arg(value, PARSE_ADDR, &tls_desc->local_address))
976 ast_log(LOG_ERROR,
"Invalid %s '%s'\n", varname, value);
977 }
else if (!strcasecmp(varname,
"tlsclientmethod") || !strcasecmp(varname,
"sslclientmethod")) {
978 if (!strcasecmp(value,
"tlsv1")) {
982 }
else if (!strcasecmp(value,
"sslv3")) {
986 }
else if (!strcasecmp(value,
"sslv2")) {
991 }
else if (!strcasecmp(varname,
"tlsservercipherorder")) {
993 }
else if (!strcasecmp(varname,
"tlsdisablev1")) {
995 }
else if (!strcasecmp(varname,
"tlsdisablev11")) {
997 }
else if (!strcasecmp(varname,
"tlsdisablev12")) {
void(* periodic_fn)(void *)
Asterisk locking-related definitions:
Asterisk main include file. File version handling, generic pbx functions.
int ast_parse_arg(const char *arg, enum ast_parse_flags flags, void *p_result,...)
The argument parsing routine.
int ast_iostream_start_tls(struct ast_iostream **stream, SSL_CTX *ctx, int client)
Begin TLS on an iostream.
static void ast_sockaddr_copy(struct ast_sockaddr *dst, const struct ast_sockaddr *src)
Copies the data from one ast_sockaddr to another.
struct ast_tcptls_session_instance * ast_tcptls_client_start_timeout(struct ast_tcptls_session_instance *tcptls_session, int timeout)
Attempt to connect and start a tcptls session within the given timeout.
#define ast_socket_nonblock(domain, type, protocol)
Create a non-blocking socket.
static void * handle_tcptls_connection(void *data)
creates a FILE * from the fd passed by the accept thread. This operation is potentially expensive (ce...
struct ast_iostream * ast_iostream_from_fd(int *fd)
Create an iostream from a file descriptor.
arguments for the accepting thread
#define ast_strdup(str)
A wrapper for strdup()
int ast_sockaddr_cmp(const struct ast_sockaddr *a, const struct ast_sockaddr *b)
Compares two ast_sockaddr structures.
I/O Management (derived from Cheops-NG)
Generic support for tcp/tls servers in Asterisk.
Socket address structure.
int ast_bind(int sockfd, const struct ast_sockaddr *addr)
Wrapper around bind(2) that uses struct ast_sockaddr.
char * ast_read_textfile(const char *file)
Read a file into asterisk.
int ast_sd_get_fd(int type, const struct ast_sockaddr *addr)
Find a listening file descriptor provided by socket activation.
static void ast_sockaddr_setnull(struct ast_sockaddr *addr)
Sets address addr to null.
SSL * ast_iostream_get_ssl(struct ast_iostream *stream)
Get a pointer to an iostream's OpenSSL SSL structure.
static int ast_sockaddr_isnull(const struct ast_sockaddr *addr)
Checks if the ast_sockaddr is null. "null" in this sense essentially means uninitialized, or having a 0 length.
Configuration File Parser.
void ast_tcptls_server_start(struct ast_tcptls_session_args *desc)
This is a generic (re)start routine for a TCP server, which does the socket/bind/listen and starts a ...
int ast_sockaddr_is_any(const struct ast_sockaddr *addr)
Determine if the address type is unspecified, or "any" address.
int ast_accept(int sockfd, struct ast_sockaddr *addr)
Wrapper around accept(2) that uses struct ast_sockaddr.
int ast_iostream_close(struct ast_iostream *stream)
Close an iostream.
#define ast_strdupa(s)
duplicate a string in memory from the stack
#define ao2_ref(o, delta)
Reference/unreference an object and return the old refcount.
#define ast_debug(level,...)
Log a DEBUG message.
Core PBX routines and definitions.
describes a server instance
void ast_sha1_hash(char *output, const char *input)
Produces SHA1 hash based on input string.
int attribute_pure ast_true(const char *val)
Make sure something is true. Determine if a string containing a boolean value is "true". This function checks to see whether a string passed to it is an indication of an "true" value. It checks to see if the string is "yes", "true", "y", "t", "on" or "1".
static char * ast_sockaddr_stringify(const struct ast_sockaddr *addr)
Wrapper around ast_sockaddr_stringify_fmt() with default format.
General Definitions for Asterisk top level program Included by asterisk.h to handle platform-specific...
Generic abstraction for input/output streams.
#define ast_calloc(num, len)
A wrapper for calloc()
#define ast_fd_clear_flags(fd, flags)
Clear flags on the given file descriptor.
void *(* worker_fn)(void *)
Support for logging to various files, console and syslog Configuration in file logger.conf.
struct ast_sockaddr old_address
struct ast_tls_config * old_tls_cfg
struct ast_iostream * stream
int ast_iostream_set_sni_hostname(struct ast_iostream *stream, const char *sni_hostname)
Set the iostream's SNI hostname for TLS client connections.
void ast_tcptls_close_session_file(struct ast_tcptls_session_instance *tcptls_session)
Closes a tcptls session instance's file and/or file descriptor. The tcptls_session will be set to NUL...
struct ast_tcptls_session_instance * ast_tcptls_client_create(struct ast_tcptls_session_args *desc)
Creates a client connection's ast_tcptls_session_instance.
int ast_ssl_setup(struct ast_tls_config *cfg)
Set up an SSL server.
void ast_ssl_teardown(struct ast_tls_config *cfg)
free resources used by an SSL server
int ast_tls_read_conf(struct ast_tls_config *tls_cfg, struct ast_tcptls_session_args *tls_desc, const char *varname, const char *value)
Used to parse conf files containing tls/ssl options.
#define S_OR(a, b)
returns the equivalent of logic or for strings: first one if not empty, otherwise second one...
struct ast_tcptls_session_instance * ast_tcptls_client_start(struct ast_tcptls_session_instance *tcptls_session)
Attempt to connect and start a tcptls session.
int ast_thread_user_interface_set(int is_user_interface)
Set the current thread's user interface status.
int ast_thread_inhibit_escalations(void)
Inhibit (in the current thread) the execution of dialplan functions which cause privilege escalations...
struct ast_tls_config * tls_cfg
void ast_tcptls_server_stop(struct ast_tcptls_session_args *desc)
Shutdown a running server if there is one.
Application convenience functions, designed to give consistent look and feel to Asterisk apps...
int ast_sockaddr_is_ipv6(const struct ast_sockaddr *addr)
Determine if this is an IPv6 address.
int ast_connect(int sockfd, const struct ast_sockaddr *addr)
Wrapper around connect(2) that uses struct ast_sockaddr.
char hostname[MAXHOSTNAMELEN]
#define ast_str_create(init_len)
Create a malloc'ed dynamic length string.
void *(* accept_fn)(void *)