Add BIO_get_new_index()

Reviewed-by: NDr. Stephen Henson <steve@openssl.org>

crypto/bio/b_addr.c

@@ -19,6 +19,7 @@
 #include <ctype.h>
 
 CRYPTO_RWLOCK *bio_lookup_lock;
+extern CRYPTO_RWLOCK  *bio_type_lock;
 static CRYPTO_ONCE bio_lookup_init = CRYPTO_ONCE_STATIC_INIT;
 
 /*
@@ -605,7 +606,8 @@ static int addrinfo_wrap(int family, int socktype,
 DEFINE_RUN_ONCE_STATIC(do_bio_lookup_init)
 {
     bio_lookup_lock = CRYPTO_THREAD_lock_new();
-    return (bio_lookup_lock != NULL);
+    bio_type_lock = CRYPTO_THREAD_lock_new();
+    return bio_lookup_lock != NULL && bio_type_lock != NULL;
 }
 
 /*-

crypto/bio/bio_lcl.h

@@ -137,6 +137,7 @@ typedef unsigned int socklen_t;
 # endif
 
 extern CRYPTO_RWLOCK *bio_lookup_lock;
+extern CRYPTO_RWLOCK *bio_type_lock;
 
 int BIO_ADDR_make(BIO_ADDR *ap, const struct sockaddr *sa);
 const struct sockaddr *BIO_ADDR_sockaddr(const BIO_ADDR *ap);

crypto/bio/bio_lib.c

@@ -594,5 +594,7 @@ void bio_cleanup(void)
     bio_sock_cleanup_int();
     CRYPTO_THREAD_lock_free(bio_lookup_lock);
     bio_lookup_lock = NULL;
+    CRYPTO_THREAD_lock_free(bio_type_lock);
+    bio_type_lock = NULL;
 #endif
 }

crypto/bio/bio_meth.c

@@ -9,6 +9,18 @@
 
 #include "bio_lcl.h"
 
+CRYPTO_RWLOCK *bio_type_lock;
+static int bio_count = BIO_TYPE_START;
+
+int BIO_get_new_index()
+{
+    int newval;
+
+    if (!CRYPTO_atomic_add(&bio_count, 1, &newval, bio_type_lock))
+        return -1;
+    return newval;
+}
+
 BIO_METHOD *BIO_meth_new(int type, const char *name)
 {
     BIO_METHOD *biom = OPENSSL_zalloc(sizeof(BIO_METHOD));

doc/crypto/BIO_meth_new.pod

@@ -2,6 +2,7 @@
 
 =head1 NAME
 
+BIO_get_new_index,
 BIO_meth_new, BIO_meth_free, BIO_meth_get_write, BIO_meth_set_write,
 BIO_meth_get_read, BIO_meth_set_read, BIO_meth_get_puts, BIO_meth_set_puts,
 BIO_meth_get_gets, BIO_meth_set_gets, BIO_meth_get_ctrl, BIO_meth_set_ctrl,
@@ -13,6 +14,7 @@ BIO_meth_set_callback_ctrl  - Routines to build up BIO methods
 
  #include <openssl/bio.h>
 
+ int BIO_get_new_index(void);
  BIO_METHOD *BIO_meth_new(int type, const char *name);
  void BIO_meth_free(BIO_METHOD *biom);
  int (*BIO_meth_get_write(BIO_METHOD *biom)) (BIO *, const char *, int);
@@ -47,7 +49,10 @@ types. It provides a set of of functions used by OpenSSL for the implementation
 of the various BIO capabilities. See the L<bio> page for more information.
 
 BIO_meth_new() creates a new B<BIO_METHOD> structure. It should be given a
-unique integer B<type> and a string that represents its B<name>. The set of
+unique integer B<type> and a string that represents its B<name>.
+Use BIO_get_new_index() to get the value for B<type>.
+
+The set of
 standard OpenSSL provided BIO types is provided in B<bio.h>. Some examples
 include B<BIO_TYPE_BUFFER> and B<BIO_TYPE_CIPHER>. Filter BIOs should have a
 type which have the "filter" bit set (B<BIO_TYPE_FILTER>). Source/sink BIOs

include/openssl/bio.h

@@ -31,38 +31,39 @@
 extern "C" {
 #endif
 
+/* There are the classes of BIOs */
+# define BIO_TYPE_DESCRIPTOR     0x0100 /* socket, fd, connect or accept */
+# define BIO_TYPE_FILTER         0x0200
+# define BIO_TYPE_SOURCE_SINK    0x0400
+
 /* These are the 'types' of BIOs */
-# define BIO_TYPE_NONE           0
-# define BIO_TYPE_MEM            (1|0x0400)
-# define BIO_TYPE_FILE           (2|0x0400)
-
-# define BIO_TYPE_FD             (4|0x0400|0x0100)
-# define BIO_TYPE_SOCKET         (5|0x0400|0x0100)
-# define BIO_TYPE_NULL           (6|0x0400)
-# define BIO_TYPE_SSL            (7|0x0200)
-# define BIO_TYPE_MD             (8|0x0200)/* passive filter */
-# define BIO_TYPE_BUFFER         (9|0x0200)/* filter */
-# define BIO_TYPE_CIPHER         (10|0x0200)/* filter */
-# define BIO_TYPE_BASE64         (11|0x0200)/* filter */
-# define BIO_TYPE_CONNECT        (12|0x0400|0x0100)/* socket - connect */
-# define BIO_TYPE_ACCEPT         (13|0x0400|0x0100)/* socket for accept */
-/* # define BIO_TYPE_PROXY_CLIENT   (14|0x0200)*/ /* client proxy BIO */
-/* # define BIO_TYPE_PROXY_SERVER   (15|0x0200)*/ /* server proxy BIO */
-# define BIO_TYPE_NBIO_TEST      (16|0x0200)/* server proxy BIO */
-# define BIO_TYPE_NULL_FILTER    (17|0x0200)
-# define BIO_TYPE_BER            (18|0x0200)/* BER -> bin filter */
-# define BIO_TYPE_BIO            (19|0x0400)/* (half a) BIO pair */
-# define BIO_TYPE_LINEBUFFER     (20|0x0200)/* filter */
-# define BIO_TYPE_DGRAM          (21|0x0400|0x0100)
+# define BIO_TYPE_NONE             0
+# define BIO_TYPE_MEM            ( 1|BIO_TYPE_SOURCE_SINK)
+# define BIO_TYPE_FILE           ( 2|BIO_TYPE_SOURCE_SINK)
+
+# define BIO_TYPE_FD             ( 4|BIO_TYPE_SOURCE_SINK|BIO_TYPE_DESCRIPTOR)
+# define BIO_TYPE_SOCKET         ( 5|BIO_TYPE_SOURCE_SINK|BIO_TYPE_DESCRIPTOR)
+# define BIO_TYPE_NULL           ( 6|BIO_TYPE_SOURCE_SINK)
+# define BIO_TYPE_SSL            ( 7|BIO_TYPE_FILTER)
+# define BIO_TYPE_MD             ( 8|BIO_TYPE_FILTER)
+# define BIO_TYPE_BUFFER         ( 9|BIO_TYPE_FILTER)
+# define BIO_TYPE_CIPHER         (10|BIO_TYPE_FILTER)
+# define BIO_TYPE_BASE64         (11|BIO_TYPE_FILTER)
+# define BIO_TYPE_CONNECT        (12|BIO_TYPE_SOURCE_SINK|BIO_TYPE_DESCRIPTOR)
+# define BIO_TYPE_ACCEPT         (13|BIO_TYPE_SOURCE_SINK|BIO_TYPE_DESCRIPTOR)
+
+# define BIO_TYPE_NBIO_TEST      (16|BIO_TYPE_FILTER)/* server proxy BIO */
+# define BIO_TYPE_NULL_FILTER    (17|BIO_TYPE_FILTER)
+# define BIO_TYPE_BIO            (19|BIO_TYPE_SOURCE_SINK)/* half a BIO pair */
+# define BIO_TYPE_LINEBUFFER     (20|BIO_TYPE_FILTER)
+# define BIO_TYPE_DGRAM          (21|BIO_TYPE_SOURCE_SINK|BIO_TYPE_DESCRIPTOR)
+# define BIO_TYPE_ASN1           (22|BIO_TYPE_FILTER)
+# define BIO_TYPE_COMP           (23|BIO_TYPE_FILTER)
 # ifndef OPENSSL_NO_SCTP
-#  define BIO_TYPE_DGRAM_SCTP     (24|0x0400|0x0100)
+#  define BIO_TYPE_DGRAM_SCTP    (24|BIO_TYPE_SOURCE_SINK|BIO_TYPE_DESCRIPTOR)
 # endif
-# define BIO_TYPE_ASN1           (22|0x0200)/* filter */
-# define BIO_TYPE_COMP           (23|0x0200)/* filter */
 
-# define BIO_TYPE_DESCRIPTOR     0x0100/* socket, fd, connect or accept */
-# define BIO_TYPE_FILTER         0x0200
-# define BIO_TYPE_SOURCE_SINK    0x0400
+#define BIO_TYPE_START           128
 
 /*
  * BIO_FILENAME_READ|BIO_CLOSE to open or close on free.
@@ -177,6 +178,7 @@ extern "C" {
 typedef union bio_addr_st BIO_ADDR;
 typedef struct bio_addrinfo_st BIO_ADDRINFO;
 
+int BIO_get_new_index(void);
 void BIO_set_flags(BIO *b, int flags);
 int BIO_test_flags(const BIO *b, int flags);
 void BIO_clear_flags(BIO *b, int flags);

util/libcrypto.num

@@ -4198,3 +4198,4 @@ X509_CRL_get0_lastUpdate                4144	1_1_0	EXIST::FUNCTION:
 X509_get0_notBefore                     4145	1_1_0	EXIST::FUNCTION:
 X509_get0_notAfter                      4146	1_1_0	EXIST::FUNCTION:
 X509_CRL_get0_nextUpdate                4147	1_1_0	EXIST::FUNCTION:
+BIO_get_new_index                       4148	1_1_0	EXIST::FUNCTION: