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Revert getaddrinfo_a()

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getaddrinfo_a() gets stuck after fork().
To avoid this, we need 1 second sleep to wait for internal
worker threads of getaddrinfo_a() to be finished, but that is unacceptable.

[Bug #17220] [Feature #17134] [Feature #17187]
This commit is contained in:
Masaki Matsushita 2020-12-07 12:49:44 +09:00
parent 1ba05f5b2d
commit 5d8bcc4870
9 changed files with 0 additions and 289 deletions
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2
configure.ac
View file

@ -1152,7 +1152,6 @@ AC_CHECK_LIB(crypt, crypt) # glibc (GNU/Linux, GNU/Hurd, GNU/kFreeBSD)
AC_CHECK_LIB(dl, dlopen) # Dynamic linking for SunOS/Solaris and SYSV
AC_CHECK_LIB(dld, shl_load) # Dynamic linking for HP-UX
AC_CHECK_LIB(socket, shutdown) # SunOS/Solaris
AC_CHECK_LIB(anl, getaddrinfo_a)
dnl Checks for header files.
AC_HEADER_DIRENT
@ -1944,7 +1943,6 @@ AC_CHECK_FUNCS(fsync)
AC_CHECK_FUNCS(ftruncate)
AC_CHECK_FUNCS(ftruncate64) # used for Win32 platform
AC_CHECK_FUNCS(getattrlist)
AC_CHECK_FUNCS(getaddrinfo_a)
AC_CHECK_FUNCS(getcwd)
AC_CHECK_FUNCS(getgidx)
AC_CHECK_FUNCS(getgrnam)

2
ext/socket/extconf.rb
View file

@ -444,7 +444,6 @@ else
test_func = "socket(0,0,0)"
have_library("nsl", 't_open("", 0, (struct t_info *)NULL)', headers) # SunOS
have_library("socket", "socket(0,0,0)", headers) # SunOS
have_library("anl", 'getaddrinfo_a', headers)
end
if have_func(test_func, headers)
@ -506,7 +505,6 @@ EOF
unless have_func("gethostname((char *)0, 0)", headers)
have_func("uname((struct utsname *)NULL)", headers)
end
have_func("getaddrinfo_a", headers)
ipv6 = false
default_ipv6 = /haiku/ !~ RUBY_PLATFORM

7
ext/socket/ipsocket.c
View file

@ -51,16 +51,9 @@ init_inetsock_internal(VALUE v)
int family = AF_UNSPEC;
const char *syscall = 0;
#ifdef HAVE_GETADDRINFO_A
arg->remote.res = rsock_addrinfo_a(arg->remote.host, arg->remote.serv,
family, SOCK_STREAM,
(type == INET_SERVER) ? AI_PASSIVE : 0,
arg->resolv_timeout);
#else
arg->remote.res = rsock_addrinfo(arg->remote.host, arg->remote.serv,
family, SOCK_STREAM,
(type == INET_SERVER) ? AI_PASSIVE : 0);
#endif
/*

248
ext/socket/raddrinfo.c
View file

@ -199,27 +199,6 @@ nogvl_getaddrinfo(void *arg)
}
#endif
#ifdef HAVE_GETADDRINFO_A
struct gai_suspend_arg
{
struct gaicb *req;
struct timespec *timeout;
};
static void *
nogvl_gai_suspend(void *arg)
{
int ret;
struct gai_suspend_arg *ptr = arg;
struct gaicb const *wait_reqs[1];
wait_reqs[0] = ptr->req;
ret = gai_suspend(wait_reqs, 1, ptr->timeout);
return (void *)(VALUE)ret;
}
#endif
static int
numeric_getaddrinfo(const char *node, const char *service,
const struct addrinfo *hints,
@ -339,175 +318,6 @@ rb_getaddrinfo(const char *node, const char *service,
return ret;
}
#ifdef HAVE_GETADDRINFO_A
struct gaicbs {
struct gaicbs *next;
struct gaicb *gaicb;
};
/* linked list to retain all outstanding and ongoing requests */
static struct gaicbs *requests = NULL;
static void
gaicbs_add(struct gaicb *req)
{
struct gaicbs *request;
if (!req) return;
request = (struct gaicbs *)xmalloc(sizeof(struct gaicbs));
request->gaicb = req;
request->next = requests;
requests = request;
}
static void
gaicbs_remove(struct gaicb *req)
{
struct gaicbs *request = requests;
struct gaicbs *prev = NULL;
if (!req) return;
while (request) {
if (request->gaicb == req) break;
prev = request;
request = request->next;
}
if (request) {
if (prev) {
prev->next = request->next;
} else {
requests = request->next;
}
xfree(request);
}
}
static void
gaicbs_cancel_all(void)
{
struct gaicbs *request = requests;
struct gaicbs *tmp, *prev = NULL;
int ret;
while (request) {
ret = gai_cancel(request->gaicb);
if (ret == EAI_NOTCANCELED) {
// continue to next request
prev = request;
request = request->next;
} else {
// remove the request from the list
if (prev) {
prev->next = request->next;
} else {
requests = request->next;
}
tmp = request;
request = request->next;
xfree(tmp);
}
}
}
static void
gaicbs_wait_all(void)
{
struct gaicbs *request = requests;
int size = 0;
// count gaicbs
while (request) {
size++;
request = request->next;
}
// create list to wait
const struct gaicb *reqs[size];
request = requests;
for (int i=0; request; i++) {
reqs[i] = request->gaicb;
request = request->next;
}
// wait requests
gai_suspend(reqs, size, NULL); // ignore result intentionally
}
#define MILLISECOND_IN_NANOSECONDS 1000000
/* A mitigation for [Bug #17220].
It cancels all outstanding requests and waits for ongoing requests.
Then, it waits internal worker threads in getaddrinfo_a(3) to be finished. */
void
rb_getaddrinfo_a_before_fork(void)
{
gaicbs_cancel_all();
gaicbs_wait_all();
/* wait worker threads in getaddrinfo_a(3) to be finished.
they will finish after 1 second sleep. */
struct timespec ts = {1, 500 * MILLISECOND_IN_NANOSECONDS};
nanosleep(&ts, NULL);
}
int
rb_getaddrinfo_a(const char *node, const char *service,
const struct addrinfo *hints,
struct rb_addrinfo **res, struct timespec *timeout)
{
struct addrinfo *ai;
int ret;
int allocated_by_malloc = 0;
ret = numeric_getaddrinfo(node, service, hints, &ai);
if (ret == 0)
allocated_by_malloc = 1;
else {
struct gai_suspend_arg arg;
struct gaicb *reqs[1];
struct gaicb req;
req.ar_name = node;
req.ar_service = service;
req.ar_request = hints;
reqs[0] = &req;
ret = getaddrinfo_a(GAI_NOWAIT, reqs, 1, NULL);
if (ret) return ret;
gaicbs_add(&req);
arg.req = &req;
arg.timeout = timeout;
ret = (int)(VALUE)rb_thread_call_without_gvl(nogvl_gai_suspend, &arg, RUBY_UBF_IO, 0);
gaicbs_remove(&req);
if (ret && ret != EAI_ALLDONE) {
/* EAI_ALLDONE indicates that the request already completed and gai_suspend was redundant */
/* on Ubuntu 18.04 (or other systems), gai_suspend(3) returns EAI_SYSTEM/ENOENT on timeout */
if (ret == EAI_SYSTEM && errno == ENOENT) {
return EAI_AGAIN;
} else {
return ret;
}
}
ret = gai_error(reqs[0]);
ai = reqs[0]->ar_result;
}
if (ret == 0) {
*res = (struct rb_addrinfo *)xmalloc(sizeof(struct rb_addrinfo));
(*res)->allocated_by_malloc = allocated_by_malloc;
(*res)->ai = ai;
}
return ret;
}
#endif
void
rb_freeaddrinfo(struct rb_addrinfo *ai)
{
@ -716,42 +526,6 @@ rsock_getaddrinfo(VALUE host, VALUE port, struct addrinfo *hints, int socktype_h
return res;
}
#ifdef HAVE_GETADDRINFO_A
struct rb_addrinfo*
rsock_getaddrinfo_a(VALUE host, VALUE port, struct addrinfo *hints, int socktype_hack, VALUE timeout)
{
struct rb_addrinfo* res = NULL;
char *hostp, *portp;
int error;
char hbuf[NI_MAXHOST], pbuf[NI_MAXSERV];
int additional_flags = 0;
hostp = host_str(host, hbuf, sizeof(hbuf), &additional_flags);
portp = port_str(port, pbuf, sizeof(pbuf), &additional_flags);
if (socktype_hack && hints->ai_socktype == 0 && str_is_number(portp)) {
hints->ai_socktype = SOCK_DGRAM;
}
hints->ai_flags |= additional_flags;
if (NIL_P(timeout)) {
error = rb_getaddrinfo_a(hostp, portp, hints, &res, (struct timespec *)NULL);
} else {
struct timespec _timeout = rb_time_timespec_interval(timeout);
error = rb_getaddrinfo_a(hostp, portp, hints, &res, &_timeout);
}
if (error) {
if (hostp && hostp[strlen(hostp)-1] == '\n') {
rb_raise(rb_eSocket, "newline at the end of hostname");
}
rsock_raise_socket_error("getaddrinfo_a", error);
}
return res;
}
#endif
int
rsock_fd_family(int fd)
{
@ -777,20 +551,6 @@ rsock_addrinfo(VALUE host, VALUE port, int family, int socktype, int flags)
return rsock_getaddrinfo(host, port, &hints, 1);
}
#ifdef HAVE_GETADDRINFO_A
struct rb_addrinfo*
rsock_addrinfo_a(VALUE host, VALUE port, int family, int socktype, int flags, VALUE timeout)
{
struct addrinfo hints;
MEMZERO(&hints, struct addrinfo, 1);
hints.ai_family = family;
hints.ai_socktype = socktype;
hints.ai_flags = flags;
return rsock_getaddrinfo_a(host, port, &hints, 1, timeout);
}
#endif
VALUE
rsock_ipaddr(struct sockaddr *sockaddr, socklen_t sockaddrlen, int norevlookup)
{
@ -1071,11 +831,7 @@ call_getaddrinfo(VALUE node, VALUE service,
hints.ai_flags = NUM2INT(flags);
}
#ifdef HAVE_GETADDRINFO_A
res = rsock_getaddrinfo_a(node, service, &hints, socktype_hack, timeout);
#else
res = rsock_getaddrinfo(node, service, &hints, socktype_hack);
#endif
if (res == NULL)
rb_raise(rb_eSocket, "host not found");
@ -2873,8 +2629,4 @@ rsock_init_addrinfo(void)
rb_define_method(rb_cAddrinfo, "marshal_dump", addrinfo_mdump, 0);
rb_define_method(rb_cAddrinfo, "marshal_load", addrinfo_mload, 1);
#ifdef HAVE_GETADDRINFO_A
rb_socket_before_fork_func = rb_getaddrinfo_a_before_fork;
#endif
}

4
ext/socket/rubysocket.h
View file

@ -320,10 +320,6 @@ int rb_getnameinfo(const struct sockaddr *sa, socklen_t salen, char *host, size_
int rsock_fd_family(int fd);
struct rb_addrinfo *rsock_addrinfo(VALUE host, VALUE port, int family, int socktype, int flags);
struct rb_addrinfo *rsock_getaddrinfo(VALUE host, VALUE port, struct addrinfo *hints, int socktype_hack);
#ifdef HAVE_GETADDRINFO_A
struct rb_addrinfo *rsock_addrinfo_a(VALUE host, VALUE port, int family, int socktype, int flags, VALUE timeout);
struct rb_addrinfo *rsock_getaddrinfo_a(VALUE host, VALUE port, struct addrinfo *hints, int socktype_hack, VALUE timeout);
#endif
VALUE rsock_fd_socket_addrinfo(int fd, struct sockaddr *addr, socklen_t len);
VALUE rsock_io_socket_addrinfo(VALUE io, struct sockaddr *addr, socklen_t len);

4
ext/socket/socket.c
View file

@ -1185,11 +1185,7 @@ sock_s_getaddrinfo(int argc, VALUE *argv, VALUE _)
norevlookup = rsock_do_not_reverse_lookup;
}
#ifdef HAVE_GETADDRINFO_A
res = rsock_getaddrinfo_a(host, port, &hints, 0, Qnil);
#else
res = rsock_getaddrinfo(host, port, &hints, 0);
#endif
ret = make_addrinfo(res, norevlookup);
rb_freeaddrinfo(res);

2
include/ruby/internal/intern/process.h
View file

@ -28,8 +28,6 @@
RBIMPL_SYMBOL_EXPORT_BEGIN()
/* process.c */
RUBY_EXTERN void (* rb_socket_before_fork_func)();
void rb_last_status_set(int status, rb_pid_t pid);
VALUE rb_last_status_get(void);
int rb_proc_exec(const char*);

10
process.c
View file

@ -331,9 +331,6 @@ static ID id_CLOCK_BASED_CLOCK_PROCESS_CPUTIME_ID;
static ID id_MACH_ABSOLUTE_TIME_BASED_CLOCK_MONOTONIC;
#endif
static ID id_hertz;
#ifdef HAVE_GETADDRINFO_A
void (* rb_socket_before_fork_func)() = NULL;
#endif
/* execv and execl are async-signal-safe since SUSv4 (POSIX.1-2008, XPG7) */
#if defined(__sun) && !defined(_XPG7) /* Solaris 10, 9, ... */
@ -1624,13 +1621,6 @@ after_exec(void)
static void
before_fork_ruby(void)
{
#ifdef HAVE_GETADDRINFO_A
if (rb_socket_before_fork_func) {
/* A mitigation for [Bug #17220]. See ext/socket/raddrinfo.c */
rb_socket_before_fork_func();
}
#endif
before_exec();
}

10
test/socket/test_socket.rb
View file

@ -102,16 +102,6 @@ class TestSocket < Test::Unit::TestCase
assert_nothing_raised('[ruby-core:29427]'){ TCPServer.open('localhost', 0) {} }
end
def test_getaddrinfo_after_fork
skip "fork not supported" unless Process.respond_to?(:fork)
assert_normal_exit(<<-"end;", '[ruby-core:100329] [Bug #17220]')
require "socket"
Socket.getaddrinfo("localhost", nil)
pid = fork { Socket.getaddrinfo("localhost", nil) }
assert_equal pid, Timeout.timeout(3) { Process.wait(pid) }
end;
end
def test_getnameinfo
assert_raise(SocketError) { Socket.getnameinfo(["AF_UNIX", 80, "0.0.0.0"]) }