X-Git-Url: https://git.m6w6.name/?a=blobdiff_plain;f=libmemcached%2Fconnect.c;h=3afef7d32c99723cecb30fd76c864d43ad89df2e;hb=4209d822c35fea2ca1c5879e18bc6c063dba4c41;hp=8d0e0a9b389982372588860cefa5cddbb26f2a39;hpb=f283b947353ca50d35adad5326700df66a86c1a5;p=m6w6%2Flibmemcached

diff --git a/libmemcached/connect.c b/libmemcached/connect.c
index 8d0e0a9b..3afef7d3 100644
--- a/libmemcached/connect.c
+++ b/libmemcached/connect.c
@@ -1,9 +1,89 @@
+/* LibMemcached
+ * Copyright (C) 2006-2010 Brian Aker
+ * All rights reserved.
+ *
+ * Use and distribution licensed under the BSD license.  See
+ * the COPYING file in the parent directory for full text.
+ *
+ * Summary: Server IO, Not public!
+ *
+ */
+
 #include "common.h"
-#include <netdb.h>
-#include <poll.h>
 #include <sys/time.h>
 #include <time.h>
 
+static memcached_return_t connect_poll(memcached_server_st *ptr)
+{
+  struct pollfd fds[1];
+  fds[0].fd = ptr->fd;
+  fds[0].events = POLLOUT;
+
+  int error;
+  size_t loop_max= 5;
+
+  while (--loop_max) // Should only loop on cases of ERESTART or EINTR
+  {
+    error= poll(fds, 1, ptr->root->connect_timeout);
+
+    switch (error)
+    {
+    case 1:
+      {
+        int err;
+        socklen_t len= sizeof (err);
+        (void)getsockopt(ptr->fd, SOL_SOCKET, SO_ERROR, &err, &len);
+
+        // We check the value to see what happened wth the socket.
+        if (err == 0)
+        {
+          return MEMCACHED_SUCCESS;
+        }
+        else
+        {
+          ptr->cached_errno= errno;
+
+          return MEMCACHED_ERRNO;
+        }
+      }
+    case 0:
+      return MEMCACHED_TIMEOUT;
+    default: // A real error occurred and we need to completely bail
+      WATCHPOINT_ERRNO(get_socket_errno());
+      switch (get_socket_errno())
+      {
+#ifdef TARGET_OS_LINUX
+      case ERESTART:
+#endif
+      case EINTR:
+        continue;
+      default:
+        if (fds[0].revents & POLLERR)
+        {
+          int err;
+          socklen_t len= sizeof (err);
+          (void)getsockopt(ptr->fd, SOL_SOCKET, SO_ERROR, &err, &len);
+          ptr->cached_errno= (err == 0) ? get_socket_errno() : err;
+        }
+        else
+        {
+          ptr->cached_errno= get_socket_errno();
+        }
+
+        (void)closesocket(ptr->fd);
+        ptr->fd= INVALID_SOCKET;
+
+        return MEMCACHED_ERRNO;
+      }
+    }
+  }
+
+  // This should only be possible from ERESTART or EINTR;
+  ptr->cached_errno= get_socket_errno();
+
+  return MEMCACHED_ERRNO;
+}
+
 static memcached_return_t set_hostinfo(memcached_server_st *server)
 {
   struct addrinfo *ai;
@@ -11,7 +91,9 @@ static memcached_return_t set_hostinfo(memcached_server_st *server)
   char str_port[NI_MAXSERV];
   uint32_t counter= 5;
 
-  snprintf(str_port, NI_MAXSERV, "%u", (uint32_t)server->port);
+  int length= snprintf(str_port, NI_MAXSERV, "%u", (uint32_t)server->port);
+  if (length >= NI_MAXSERV || length < 0)
+    return MEMCACHED_FAILURE;
 
   memset(&hints, 0, sizeof(hints));
 
@@ -37,13 +119,14 @@ static memcached_return_t set_hostinfo(memcached_server_st *server)
     }
     else if (e == EAI_AGAIN)
     {
+#ifndef WIN32
       struct timespec dream, rem;
 
       dream.tv_nsec= 1000;
       dream.tv_sec= 0;
 
       nanosleep(&dream, &rem);
-
+#endif
       continue;
     }
     else
@@ -64,6 +147,45 @@ static memcached_return_t set_hostinfo(memcached_server_st *server)
   return MEMCACHED_SUCCESS;
 }
 
+static inline memcached_return_t set_socket_nonblocking(memcached_server_st *ptr)
+{
+#ifdef WIN32
+  u_long arg = 1;
+  if (ioctlsocket(ptr->fd, FIONBIO, &arg) == SOCKET_ERROR)
+  {
+    ptr->cached_errno= get_socket_errno();
+    return MEMCACHED_CONNECTION_FAILURE;
+  }
+#else
+  int flags;
+
+  do
+    flags= fcntl(ptr->fd, F_GETFL, 0);
+  while (flags == -1 && (errno == EINTR || errno == EAGAIN));
+
+  unlikely (flags == -1)
+  {
+    ptr->cached_errno= errno;
+    return MEMCACHED_CONNECTION_FAILURE;
+  }
+  else if ((flags & O_NONBLOCK) == 0)
+  {
+    int rval;
+
+    do
+      rval= fcntl(ptr->fd, F_SETFL, flags | O_NONBLOCK);
+    while (rval == -1 && (errno == EINTR || errno == EAGAIN));
+
+    unlikely (rval == -1)
+    {
+      ptr->cached_errno= errno;
+      return MEMCACHED_CONNECTION_FAILURE;
+    }
+  }
+#endif
+  return MEMCACHED_SUCCESS;
+}
+
 static memcached_return_t set_socket_options(memcached_server_st *ptr)
 {
   WATCHPOINT_ASSERT(ptr->fd != -1);
@@ -114,7 +236,7 @@ static memcached_return_t set_socket_options(memcached_server_st *ptr)
     // This is not considered a fatal error
     if (error == -1)
     {
-      WATCHPOINT_ERRNO(errno);
+      WATCHPOINT_ERRNO(get_socket_errno());
       perror("setsockopt(SO_NOSIGPIPE)");
     }
   }
@@ -193,207 +315,135 @@ static memcached_return_t set_socket_options(memcached_server_st *ptr)
       return MEMCACHED_FAILURE;
   }
 
-  /* libmemcached will always use nonblocking IO to avoid write deadlocks */
-  int flags;
-
-  do
-    flags= fcntl(ptr->fd, F_GETFL, 0);
-  while (flags == -1 && (errno == EINTR || errno == EAGAIN));
-
-  unlikely (flags == -1)
-  {
-    return MEMCACHED_CONNECTION_FAILURE;
-  }
-  else if ((flags & O_NONBLOCK) == 0)
-  {
-    int rval;
-
-    do
-      rval= fcntl(ptr->fd, F_SETFL, flags | O_NONBLOCK);
-    while (rval == -1 && (errno == EINTR || errno == EAGAIN));
 
-    unlikely (rval == -1)
-    {
-      return MEMCACHED_CONNECTION_FAILURE;
-    }
-  }
-
-  return MEMCACHED_SUCCESS;
+  /* libmemcached will always use nonblocking IO to avoid write deadlocks */
+  return set_socket_nonblocking(ptr);
 }
 
 static memcached_return_t unix_socket_connect(memcached_server_st *ptr)
 {
+#ifndef WIN32
   struct sockaddr_un servAddr;
 
-  if (ptr->fd == -1)
+  WATCHPOINT_ASSERT(ptr->fd == -1);
+
+  if ((ptr->fd= socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
   {
-    if ((ptr->fd= socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
-    {
-      ptr->cached_errno= errno;
-      return MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE;
-    }
+    ptr->cached_errno= errno;
+    return MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE;
+  }
 
-    memset(&servAddr, 0, sizeof (struct sockaddr_un));
-    servAddr.sun_family= AF_UNIX;
-    strcpy(servAddr.sun_path, ptr->hostname); /* Copy filename */
+  memset(&servAddr, 0, sizeof (struct sockaddr_un));
+  servAddr.sun_family= AF_UNIX;
+  strcpy(servAddr.sun_path, ptr->hostname); /* Copy filename */
 
 test_connect:
-    if (connect(ptr->fd,
-                (struct sockaddr *)&servAddr,
-                sizeof(servAddr)) < 0)
+  if (connect(ptr->fd,
+              (struct sockaddr *)&servAddr,
+              sizeof(servAddr)) < 0)
+  {
+    switch (errno)
     {
-      switch (errno)
-      {
-      case EINPROGRESS:
-      case EALREADY:
-      case EINTR:
-        goto test_connect;
-      case EISCONN: /* We were spinning waiting on connect */
-        break;
-      default:
-        WATCHPOINT_ERRNO(errno);
-        ptr->cached_errno= errno;
-        return MEMCACHED_ERRNO;
-      }
+    case EINPROGRESS:
+    case EALREADY:
+    case EINTR:
+      goto test_connect;
+    case EISCONN: /* We were spinning waiting on connect */
+      break;
+    default:
+      WATCHPOINT_ERRNO(errno);
+      ptr->cached_errno= errno;
+      return MEMCACHED_ERRNO;
     }
   }
 
   WATCHPOINT_ASSERT(ptr->fd != -1);
 
   return MEMCACHED_SUCCESS;
+#else
+  (void)ptr;
+  return MEMCACHED_NOT_SUPPORTED;
+#endif
 }
 
 static memcached_return_t network_connect(memcached_server_st *ptr)
 {
-  if (ptr->fd == -1)
+  bool timeout_error_occured= false;
+
+
+  WATCHPOINT_ASSERT(ptr->fd == INVALID_SOCKET);
+  WATCHPOINT_ASSERT(ptr->cursor_active == 0);
+
+  if (! ptr->options.sockaddr_inited || (!(ptr->root->flags.use_cache_lookups)))
   {
-    struct addrinfo *use;
+    memcached_return_t rc;
 
-    WATCHPOINT_ASSERT(ptr->cursor_active == 0);
+    rc= set_hostinfo(ptr);
+    if (rc != MEMCACHED_SUCCESS)
+      return rc;
+    ptr->options.sockaddr_inited= true;
+  }
 
-    if (! ptr->options.sockaddr_inited ||
-        (!(ptr->root->flags.use_cache_lookups)))
+  struct addrinfo *use= ptr->address_info;
+  /* Create the socket */
+  while (use != NULL)
+  {
+    /* Memcache server does not support IPV6 in udp mode, so skip if not ipv4 */
+    if (ptr->type == MEMCACHED_CONNECTION_UDP && use->ai_family != AF_INET)
     {
-      memcached_return_t rc;
-
-      rc= set_hostinfo(ptr);
-      if (rc != MEMCACHED_SUCCESS)
-        return rc;
-      ptr->options.sockaddr_inited= true;
+      use= use->ai_next;
+      continue;
     }
 
-    use= ptr->address_info;
-    /* Create the socket */
-    while (use != NULL)
+    if ((ptr->fd= socket(use->ai_family,
+                         use->ai_socktype,
+                         use->ai_protocol)) < 0)
     {
-      /* Memcache server does not support IPV6 in udp mode, so skip if not ipv4 */
-      if (ptr->type == MEMCACHED_CONNECTION_UDP && use->ai_family != AF_INET)
-      {
-        use= use->ai_next;
-        continue;
-      }
-
-      if ((ptr->fd= socket(use->ai_family,
-                           use->ai_socktype,
-                           use->ai_protocol)) < 0)
-      {
-        ptr->cached_errno= errno;
-        WATCHPOINT_ERRNO(errno);
-        return MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE;
-      }
-
-      (void)set_socket_options(ptr);
+      ptr->cached_errno= get_socket_errno();
+      WATCHPOINT_ERRNO(get_socket_errno());
+      return MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE;
+    }
 
-      /* connect to server */
-      if ((connect(ptr->fd, use->ai_addr, use->ai_addrlen) == -1))
-      {
-        ptr->cached_errno= errno;
-        if (errno == EINPROGRESS || /* nonblocking mode - first return, */
-            errno == EALREADY) /* nonblocking mode - subsequent returns */
-        {
-          struct pollfd fds[1];
-          fds[0].fd = ptr->fd;
-          fds[0].events = POLLOUT;
-
-          int timeout= ptr->root->connect_timeout;
-          if (ptr->root->flags.no_block == false)
-            timeout= -1;
-
-          size_t loop_max= 5;
-          while (--loop_max)
-          {
-            int error= poll(fds, 1, timeout);
-
-            switch (error)
-            {
-            case 1:
-              loop_max= 1;
-              break;
-            case 0:
-              continue;
-              // A real error occurred and we need to completely bail
-            default:
-              WATCHPOINT_ERRNO(errno);
-              switch (errno)
-              {
-#ifdef TARGET_OS_LINUX
-              case ERESTART:
-#endif
-              case EINTR:
-                continue;
-              default:
-                if (fds[0].revents & POLLERR)
-                {
-                  int err;
-                  socklen_t len= sizeof (err);
-                  (void)getsockopt(ptr->fd, SOL_SOCKET, SO_ERROR, &err, &len);
-                  ptr->cached_errno= (err == 0) ? errno : err;
-                }
-
-                (void)close(ptr->fd);
-                ptr->fd= -1;
-
-                break;
-              }
-            }
-          }
-        }
-        else if (errno == EISCONN) /* we are connected :-) */
-        {
-          break;
-        }
-        else if (errno != EINTR)
-        {
-          (void)close(ptr->fd);
-          ptr->fd= -1;
-          break;
-        }
-      }
+    (void)set_socket_options(ptr);
 
-#ifdef LIBMEMCACHED_WITH_SASL_SUPPORT
-      if (ptr->fd != -1 && ptr->root->sasl.callbacks != NULL)
-      {
-        memcached_return rc= memcached_sasl_authenticate_connection(ptr);
-        if (rc != MEMCACHED_SUCCESS)
-        {
-          (void)close(ptr->fd);
-          ptr->fd= -1;
+    /* connect to server */
+    if ((connect(ptr->fd, use->ai_addr, use->ai_addrlen) != SOCKET_ERROR))
+    {
+      break; // Success
+    }
 
-          return rc;
-        }
-      }
-#endif
+    /* An error occurred */
+    ptr->cached_errno= get_socket_errno();
+    if (ptr->cached_errno == EWOULDBLOCK ||
+        ptr->cached_errno == EINPROGRESS || /* nonblocking mode - first return, */
+        ptr->cached_errno == EALREADY) /* nonblocking mode - subsequent returns */
+    {
+      memcached_return_t rc;
+      rc= connect_poll(ptr);
 
+      if (rc == MEMCACHED_TIMEOUT)
+        timeout_error_occured= true;
 
-      if (ptr->fd != -1)
-      {
-        return MEMCACHED_SUCCESS;
-      }
-      use = use->ai_next;
+      if (rc == MEMCACHED_SUCCESS)
+        break;
     }
+    else if (get_socket_errno() == EISCONN) /* we are connected :-) */
+    {
+      break;
+    }
+    else if (get_socket_errno() == EINTR) // Special case, we retry ai_addr
+    {
+      (void)closesocket(ptr->fd);
+      ptr->fd= INVALID_SOCKET;
+      continue;
+    }
+
+    (void)closesocket(ptr->fd);
+    ptr->fd= INVALID_SOCKET;
+    use= use->ai_next;
   }
 
-  if (ptr->fd == -1)
+  if (ptr->fd == INVALID_SOCKET)
   {
     WATCHPOINT_STRING("Never got a good file descriptor");
 
@@ -406,7 +456,7 @@ static memcached_return_t network_connect(memcached_server_st *ptr)
         ptr->next_retry= next_time.tv_sec + ptr->root->retry_timeout;
     }
 
-    if (ptr->cached_errno == 0)
+    if (timeout_error_occured)
       return MEMCACHED_TIMEOUT;
 
     return MEMCACHED_ERRNO; /* The last error should be from connect() */
@@ -433,6 +483,10 @@ void set_last_disconnected_host(memcached_server_write_instance_st ptr)
 memcached_return_t memcached_connect(memcached_server_write_instance_st ptr)
 {
   memcached_return_t rc= MEMCACHED_NO_SERVERS;
+
+  if (ptr->fd != INVALID_SOCKET)
+    return MEMCACHED_SUCCESS;
+
   LIBMEMCACHED_MEMCACHED_CONNECT_START();
 
   /* both retry_timeout and server_failure_limit must be set in order to delay retrying a server on error. */
@@ -479,6 +533,17 @@ memcached_return_t memcached_connect(memcached_server_write_instance_st ptr)
   case MEMCACHED_CONNECTION_UDP:
   case MEMCACHED_CONNECTION_TCP:
     rc= network_connect(ptr);
+#ifdef LIBMEMCACHED_WITH_SASL_SUPPORT
+    if (ptr->fd != INVALID_SOCKET && ptr->root->sasl.callbacks)
+    {
+      rc= memcached_sasl_authenticate_connection(ptr);
+      if (rc != MEMCACHED_SUCCESS)
+      {
+        (void)closesocket(ptr->fd);
+        ptr->fd= INVALID_SOCKET;
+      }
+    }
+#endif
     break;
   case MEMCACHED_CONNECTION_UNIX_SOCKET:
     rc= unix_socket_connect(ptr);