From 14ae3070964b882ced21557aabdf4c9930d2cc6a Mon Sep 17 00:00:00 2001
From: Alan Antonuk <alan.antonuk@gmail.com>
Date: Thu, 16 Apr 2015 23:25:41 -0700
Subject: Add nonblocking sockets in OpenSSL socket impl

---
 librabbitmq/amqp_openssl.c | 60 ++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 55 insertions(+), 5 deletions(-)

diff --git a/librabbitmq/amqp_openssl.c b/librabbitmq/amqp_openssl.c
index 57589d8..ceb0641 100644
--- a/librabbitmq/amqp_openssl.c
+++ b/librabbitmq/amqp_openssl.c
@@ -33,6 +33,7 @@
 #include "amqp_socket.h"
 #include "amqp_hostcheck.h"
 #include "amqp_private.h"
+#include "amqp_timer.h"
 #include "threads.h"
 
 #include <ctype.h>
@@ -97,6 +98,12 @@ amqp_ssl_socket_send(void *base,
     /* TODO: Close connection if it isn't already? */
     /* TODO: Possibly be more intelligent in reporting WHAT went wrong */
     switch (self->internal_error) {
+      case SSL_ERROR_WANT_READ:
+        res = AMQP_PRIVATE_STATUS_SOCKET_NEEDREAD;
+        break;
+      case SSL_ERROR_WANT_WRITE:
+        res = AMQP_PRIVATE_STATUS_SOCKET_NEEDWRITE;
+        break;
       case SSL_ERROR_ZERO_RETURN:
         res = AMQP_STATUS_CONNECTION_CLOSED;
         break;
@@ -166,7 +173,13 @@ amqp_ssl_socket_recv(void *base,
   received = SSL_read(self->ssl, buf, len);
   if (0 >= received) {
     self->internal_error = SSL_get_error(self->ssl, received);
-    switch(self->internal_error) {
+    switch (self->internal_error) {
+    case SSL_ERROR_WANT_READ:
+        received = AMQP_PRIVATE_STATUS_SOCKET_NEEDREAD;
+        break;
+    case SSL_ERROR_WANT_WRITE:
+        received = AMQP_PRIVATE_STATUS_SOCKET_NEEDWRITE;
+        break;
     case SSL_ERROR_ZERO_RETURN:
       received = AMQP_STATUS_CONNECTION_CLOSED;
       break;
@@ -289,6 +302,7 @@ amqp_ssl_socket_open(void *base, const char *host, int port, struct timeval *tim
   struct amqp_ssl_socket_t *self = (struct amqp_ssl_socket_t *)base;
   long result;
   int status;
+  amqp_timer_t timer;
   if (-1 != self->sockfd) {
     return AMQP_STATUS_SOCKET_INUSE;
   }
@@ -301,8 +315,12 @@ amqp_ssl_socket_open(void *base, const char *host, int port, struct timeval *tim
     goto exit;
   }
 
-  SSL_set_mode(self->ssl, SSL_MODE_AUTO_RETRY);
-  self->sockfd = amqp_open_socket_noblock(host, port, timeout);
+  status = amqp_timer_start(&timer, timeout);
+  if (AMQP_STATUS_OK != status) {
+    return status;
+  }
+
+  self->sockfd = amqp_open_socket_inner(host, port, timer);
   if (0 > self->sockfd) {
     status = self->sockfd;
     self->internal_error = amqp_os_socket_error();
@@ -317,10 +335,23 @@ amqp_ssl_socket_open(void *base, const char *host, int port, struct timeval *tim
     goto error_out2;
   }
 
+start_connect:
   status = SSL_connect(self->ssl);
   if (!status) {
     self->internal_error = SSL_get_error(self->ssl, status);
-    status = AMQP_STATUS_SSL_CONNECTION_FAILED;
+    switch (self->internal_error) {
+      case SSL_ERROR_WANT_READ:
+        status = amqp_poll_read(self->sockfd, timer);
+        break;
+      case SSL_ERROR_WANT_WRITE:
+        status = amqp_poll_write(self->sockfd, timer);
+        break;
+      default:
+        status = AMQP_STATUS_SSL_CONNECTION_FAILED;
+    }
+    if (AMQP_STATUS_OK == status) {
+      goto start_connect;
+    }
     goto error_out2;
   }
 
@@ -359,13 +390,32 @@ error_out1:
 static int
 amqp_ssl_socket_close(void *base)
 {
+  int res;
   struct amqp_ssl_socket_t *self = (struct amqp_ssl_socket_t *)base;
 
   if (-1 == self->sockfd) {
     return AMQP_STATUS_SOCKET_CLOSED;
   }
 
-  SSL_shutdown(self->ssl);
+start_shutdown:
+  res = SSL_shutdown(self->ssl);
+  if (0 == res) {
+    goto start_shutdown;
+  } else if (-1 == res) {
+    self->internal_error = SSL_get_error(self->ssl, res);
+    switch (self->internal_error) {
+      case SSL_ERROR_WANT_READ:
+        res = amqp_poll_read(self->sockfd, amqp_timer_start_infinite());
+        break;
+      case SSL_ERROR_WANT_WRITE:
+        res = amqp_poll_write(self->sockfd, amqp_timer_start_infinite());
+        break;
+    }
+    if (AMQP_STATUS_OK == res) {
+      goto start_shutdown;
+    }
+    /* Swallow errors in poll, just consider the connection dead */
+  }
   SSL_free(self->ssl);
   self->ssl = NULL;
 
-- 
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