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Move from naked int to a structure in net.c

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Provides more flexibility for future changes/extensions.
This commit is contained in:
Manuel Pégourié-Gonnard 2015-06-30 13:34:45 +02:00
parent 16a17a496c
commit 91895853ac
3 changed files with 91 additions and 52 deletions
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2
ChangeLog
View file

@ -71,6 +71,8 @@ API Changes
mbedtls_base64_decode() mbedtls_base64_decode()
mbedtls_mpi_write_string() mbedtls_mpi_write_string()
mbedtls_dhm_calc_secret() mbedtls_dhm_calc_secret()
* In the NET module, all "int" and "int *" arguments for file descriptors
changed type to "mbedtls_net_context *".
* net_accept() gained new arguments for the size of the client_ip buffer. * net_accept() gained new arguments for the size of the client_ip buffer.
* In the threading layer, mbedtls_mutex_init() and mbedtls_mutex_free() now * In the threading layer, mbedtls_mutex_init() and mbedtls_mutex_free() now
return void. return void.

48
include/mbedtls/net.h
View file

@ -55,10 +55,31 @@
extern "C" { extern "C" {
#endif #endif
/**
* Wrapper type for sockets.
*
* Currently backed by just a file descriptor, but might be more in the future
* (eg two file descriptors for combined IPv4 + IPv6 support, or additional
* structures for hand-made UDP demultiplexing).
*/
typedef struct
{
int fd; /**< The underlying file descriptor */
}
mbedtls_net_context;
/**
* \brief Initialize a context
* Just makes the context ready to be used or freed safely.
*
* \param ctx Context to initialize
*/
void mbedtls_net_init( mbedtls_net_context *ctx );
/** /**
* \brief Initiate a connection with host:port in the given protocol * \brief Initiate a connection with host:port in the given protocol
* *
* \param fd Socket to use * \param ctx Socket to use
* \param host Host to connect to * \param host Host to connect to
* \param port Port to connect to * \param port Port to connect to
* \param proto Protocol: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP * \param proto Protocol: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP
@ -70,13 +91,13 @@ extern "C" {
* *
* \note Sets the socket in connected mode even with UDP. * \note Sets the socket in connected mode even with UDP.
*/ */
int mbedtls_net_connect( int *fd, const char *host, const char *port, int proto ); int mbedtls_net_connect( mbedtls_net_context *ctx, const char *host, const char *port, int proto );
/** /**
* \brief Create a receiving socket on bind_ip:port in the chosen * \brief Create a receiving socket on bind_ip:port in the chosen
* protocol. If bind_ip == NULL, all interfaces are bound. * protocol. If bind_ip == NULL, all interfaces are bound.
* *
* \param fd Socket to use * \param ctx Socket to use
* \param bind_ip IP to bind to, can be NULL * \param bind_ip IP to bind to, can be NULL
* \param port Port number to use * \param port Port number to use
* \param proto Protocol: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP * \param proto Protocol: MBEDTLS_NET_PROTO_TCP or MBEDTLS_NET_PROTO_UDP
@ -89,13 +110,13 @@ int mbedtls_net_connect( int *fd, const char *host, const char *port, int proto
* \note Regardless of the protocol, opens the sockets and binds it. * \note Regardless of the protocol, opens the sockets and binds it.
* In addition, make the socket listening if protocol is TCP. * In addition, make the socket listening if protocol is TCP.
*/ */
int mbedtls_net_bind( int *fd, const char *bind_ip, const char *port, int proto ); int mbedtls_net_bind( mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto );
/** /**
* \brief Accept a connection from a remote client * \brief Accept a connection from a remote client
* *
* \param bind_fd Relevant socket * \param bind_ctx Relevant socket
* \param client_fd Will contain the connected client socket * \param client_ctx Will contain the connected client socket
* \param client_ip Will contain the client IP address * \param client_ip Will contain the client IP address
* \param buf_size Size of the client_ip buffer * \param buf_size Size of the client_ip buffer
* \param ip_len Will receive the size of the client IP written * \param ip_len Will receive the size of the client IP written
@ -110,26 +131,27 @@ int mbedtls_net_bind( int *fd, const char *bind_ip, const char *port, int proto
* its descriptor to client_fd. New clients will not be able * its descriptor to client_fd. New clients will not be able
* to connect until you close the socket and bind a new one. * to connect until you close the socket and bind a new one.
*/ */
int mbedtls_net_accept( int bind_fd, int *client_fd, int mbedtls_net_accept( mbedtls_net_context *bind_ctx,
mbedtls_net_context *client_ctx,
void *client_ip, size_t buf_size, size_t *ip_len ); void *client_ip, size_t buf_size, size_t *ip_len );
/** /**
* \brief Set the socket blocking * \brief Set the socket blocking
* *
* \param fd Socket to set * \param ctx Socket to set
* *
* \return 0 if successful, or a non-zero error code * \return 0 if successful, or a non-zero error code
*/ */
int mbedtls_net_set_block( int fd ); int mbedtls_net_set_block( mbedtls_net_context *ctx );
/** /**
* \brief Set the socket non-blocking * \brief Set the socket non-blocking
* *
* \param fd Socket to set * \param ctx Socket to set
* *
* \return 0 if successful, or a non-zero error code * \return 0 if successful, or a non-zero error code
*/ */
int mbedtls_net_set_nonblock( int fd ); int mbedtls_net_set_nonblock( mbedtls_net_context *ctx );
/** /**
* \brief Portable usleep helper * \brief Portable usleep helper
@ -196,9 +218,9 @@ int mbedtls_net_recv_timeout( void *ctx, unsigned char *buf, size_t len,
/** /**
* \brief Gracefully shutdown the connection * \brief Gracefully shutdown the connection
* *
* \param fd The socket to close * \param ctx The socket to close
*/ */
void mbedtls_net_close( int fd ); void mbedtls_net_close( mbedtls_net_context *ctx );
#ifdef __cplusplus #ifdef __cplusplus
} }

93
library/net.c
View file

@ -110,10 +110,18 @@ static int net_prepare( void )
return( 0 ); return( 0 );
} }
/*
* Initialize a context
*/
void mbedtls_net_init( mbedtls_net_context *ctx )
{
ctx->fd = -1;
}
/* /*
* Initiate a TCP connection with host:port and the given protocol * Initiate a TCP connection with host:port and the given protocol
*/ */
int mbedtls_net_connect( int *fd, const char *host, const char *port, int proto ) int mbedtls_net_connect( mbedtls_net_context *ctx, const char *host, const char *port, int proto )
{ {
int ret; int ret;
struct addrinfo hints, *addr_list, *cur; struct addrinfo hints, *addr_list, *cur;
@ -134,21 +142,21 @@ int mbedtls_net_connect( int *fd, const char *host, const char *port, int proto
ret = MBEDTLS_ERR_NET_UNKNOWN_HOST; ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
for( cur = addr_list; cur != NULL; cur = cur->ai_next ) for( cur = addr_list; cur != NULL; cur = cur->ai_next )
{ {
*fd = (int) socket( cur->ai_family, cur->ai_socktype, ctx->fd = (int) socket( cur->ai_family, cur->ai_socktype,
cur->ai_protocol ); cur->ai_protocol );
if( *fd < 0 ) if( ctx->fd < 0 )
{ {
ret = MBEDTLS_ERR_NET_SOCKET_FAILED; ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
continue; continue;
} }
if( connect( *fd, cur->ai_addr, cur->ai_addrlen ) == 0 ) if( connect( ctx->fd, cur->ai_addr, cur->ai_addrlen ) == 0 )
{ {
ret = 0; ret = 0;
break; break;
} }
close( *fd ); close( ctx->fd );
ret = MBEDTLS_ERR_NET_CONNECT_FAILED; ret = MBEDTLS_ERR_NET_CONNECT_FAILED;
} }
@ -160,7 +168,7 @@ int mbedtls_net_connect( int *fd, const char *host, const char *port, int proto
/* /*
* Create a listening socket on bind_ip:port * Create a listening socket on bind_ip:port
*/ */
int mbedtls_net_bind( int *fd, const char *bind_ip, const char *port, int proto ) int mbedtls_net_bind( mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto )
{ {
int n, ret; int n, ret;
struct addrinfo hints, *addr_list, *cur; struct addrinfo hints, *addr_list, *cur;
@ -183,26 +191,26 @@ int mbedtls_net_bind( int *fd, const char *bind_ip, const char *port, int proto
ret = MBEDTLS_ERR_NET_UNKNOWN_HOST; ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
for( cur = addr_list; cur != NULL; cur = cur->ai_next ) for( cur = addr_list; cur != NULL; cur = cur->ai_next )
{ {
*fd = (int) socket( cur->ai_family, cur->ai_socktype, ctx->fd = (int) socket( cur->ai_family, cur->ai_socktype,
cur->ai_protocol ); cur->ai_protocol );
if( *fd < 0 ) if( ctx->fd < 0 )
{ {
ret = MBEDTLS_ERR_NET_SOCKET_FAILED; ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
continue; continue;
} }
n = 1; n = 1;
if( setsockopt( *fd, SOL_SOCKET, SO_REUSEADDR, if( setsockopt( ctx->fd, SOL_SOCKET, SO_REUSEADDR,
(const char *) &n, sizeof( n ) ) != 0 ) (const char *) &n, sizeof( n ) ) != 0 )
{ {
close( *fd ); close( ctx->fd );
ret = MBEDTLS_ERR_NET_SOCKET_FAILED; ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
continue; continue;
} }
if( bind( *fd, cur->ai_addr, cur->ai_addrlen ) != 0 ) if( bind( ctx->fd, cur->ai_addr, cur->ai_addrlen ) != 0 )
{ {
close( *fd ); close( ctx->fd );
ret = MBEDTLS_ERR_NET_BIND_FAILED; ret = MBEDTLS_ERR_NET_BIND_FAILED;
continue; continue;
} }
@ -210,9 +218,9 @@ int mbedtls_net_bind( int *fd, const char *bind_ip, const char *port, int proto
/* Listen only makes sense for TCP */ /* Listen only makes sense for TCP */
if( proto == MBEDTLS_NET_PROTO_TCP ) if( proto == MBEDTLS_NET_PROTO_TCP )
{ {
if( listen( *fd, MBEDTLS_NET_LISTEN_BACKLOG ) != 0 ) if( listen( ctx->fd, MBEDTLS_NET_LISTEN_BACKLOG ) != 0 )
{ {
close( *fd ); close( ctx->fd );
ret = MBEDTLS_ERR_NET_LISTEN_FAILED; ret = MBEDTLS_ERR_NET_LISTEN_FAILED;
continue; continue;
} }
@ -235,9 +243,9 @@ int mbedtls_net_bind( int *fd, const char *bind_ip, const char *port, int proto
* Check if the requested operation would be blocking on a non-blocking socket * Check if the requested operation would be blocking on a non-blocking socket
* and thus 'failed' with a negative return value. * and thus 'failed' with a negative return value.
*/ */
static int net_would_block( int fd ) static int net_would_block( const mbedtls_net_context *ctx )
{ {
((void) fd); ((void) ctx);
return( WSAGetLastError() == WSAEWOULDBLOCK ); return( WSAGetLastError() == WSAEWOULDBLOCK );
} }
#else #else
@ -247,12 +255,12 @@ static int net_would_block( int fd )
* *
* Note: on a blocking socket this function always returns 0! * Note: on a blocking socket this function always returns 0!
*/ */
static int net_would_block( int fd ) static int net_would_block( const mbedtls_net_context *ctx )
{ {
/* /*
* Never return 'WOULD BLOCK' on a non-blocking socket * Never return 'WOULD BLOCK' on a non-blocking socket
*/ */
if( ( fcntl( fd, F_GETFL ) & O_NONBLOCK ) != O_NONBLOCK ) if( ( fcntl( ctx->fd, F_GETFL ) & O_NONBLOCK ) != O_NONBLOCK )
return( 0 ); return( 0 );
switch( errno ) switch( errno )
@ -272,7 +280,8 @@ static int net_would_block( int fd )
/* /*
* Accept a connection from a remote client * Accept a connection from a remote client
*/ */
int mbedtls_net_accept( int bind_fd, int *client_fd, int mbedtls_net_accept( mbedtls_net_context *bind_ctx,
mbedtls_net_context *client_ctx,
void *client_ip, size_t buf_size, size_t *ip_len ) void *client_ip, size_t buf_size, size_t *ip_len )
{ {
int ret; int ret;
@ -290,7 +299,8 @@ int mbedtls_net_accept( int bind_fd, int *client_fd,
#endif #endif
/* Is this a TCP or UDP socket? */ /* Is this a TCP or UDP socket? */
if( getsockopt( bind_fd, SOL_SOCKET, SO_TYPE, (void *) &type, &type_len ) != 0 || if( getsockopt( bind_ctx->fd, SOL_SOCKET, SO_TYPE,
(void *) &type, &type_len ) != 0 ||
( type != SOCK_STREAM && type != SOCK_DGRAM ) ) ( type != SOCK_STREAM && type != SOCK_DGRAM ) )
{ {
return( MBEDTLS_ERR_NET_ACCEPT_FAILED ); return( MBEDTLS_ERR_NET_ACCEPT_FAILED );
@ -299,7 +309,7 @@ int mbedtls_net_accept( int bind_fd, int *client_fd,
if( type == SOCK_STREAM ) if( type == SOCK_STREAM )
{ {
/* TCP: actual accept() */ /* TCP: actual accept() */
ret = *client_fd = (int) accept( bind_fd, ret = client_ctx->fd = (int) accept( bind_ctx->fd,
(struct sockaddr *) &client_addr, &n ); (struct sockaddr *) &client_addr, &n );
} }
else else
@ -307,7 +317,7 @@ int mbedtls_net_accept( int bind_fd, int *client_fd,
/* UDP: wait for a message, but keep it in the queue */ /* UDP: wait for a message, but keep it in the queue */
char buf[1] = { 0 }; char buf[1] = { 0 };
ret = recvfrom( bind_fd, buf, sizeof( buf ), MSG_PEEK, ret = recvfrom( bind_ctx->fd, buf, sizeof( buf ), MSG_PEEK,
(struct sockaddr *) &client_addr, &n ); (struct sockaddr *) &client_addr, &n );
#if defined(_WIN32) #if defined(_WIN32)
@ -322,7 +332,7 @@ int mbedtls_net_accept( int bind_fd, int *client_fd,
if( ret < 0 ) if( ret < 0 )
{ {
if( net_would_block( bind_fd ) != 0 ) if( net_would_block( bind_ctx ) != 0 )
return( MBEDTLS_ERR_SSL_WANT_READ ); return( MBEDTLS_ERR_SSL_WANT_READ );
return( MBEDTLS_ERR_NET_ACCEPT_FAILED ); return( MBEDTLS_ERR_NET_ACCEPT_FAILED );
@ -331,10 +341,10 @@ int mbedtls_net_accept( int bind_fd, int *client_fd,
/* UDP: hijack the listening socket for communicating with the client */ /* UDP: hijack the listening socket for communicating with the client */
if( type != SOCK_STREAM ) if( type != SOCK_STREAM )
{ {
if( connect( bind_fd, (struct sockaddr *) &client_addr, n ) != 0 ) if( connect( bind_ctx->fd, (struct sockaddr *) &client_addr, n ) != 0 )
return( MBEDTLS_ERR_NET_ACCEPT_FAILED ); return( MBEDTLS_ERR_NET_ACCEPT_FAILED );
*client_fd = bind_fd; client_ctx->fd = bind_ctx->fd;
} }
if( client_ip != NULL ) if( client_ip != NULL )
@ -367,25 +377,25 @@ int mbedtls_net_accept( int bind_fd, int *client_fd,
/* /*
* Set the socket blocking or non-blocking * Set the socket blocking or non-blocking
*/ */
int mbedtls_net_set_block( int fd ) int mbedtls_net_set_block( mbedtls_net_context *ctx )
{ {
#if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \ #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
!defined(EFI32) !defined(EFI32)
u_long n = 0; u_long n = 0;
return( ioctlsocket( fd, FIONBIO, &n ) ); return( ioctlsocket( ctx->fd, FIONBIO, &n ) );
#else #else
return( fcntl( fd, F_SETFL, fcntl( fd, F_GETFL ) & ~O_NONBLOCK ) ); return( fcntl( ctx->fd, F_SETFL, fcntl( ctx->fd, F_GETFL ) & ~O_NONBLOCK ) );
#endif #endif
} }
int mbedtls_net_set_nonblock( int fd ) int mbedtls_net_set_nonblock( mbedtls_net_context *ctx )
{ {
#if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \ #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
!defined(EFI32) !defined(EFI32)
u_long n = 1; u_long n = 1;
return( ioctlsocket( fd, FIONBIO, &n ) ); return( ioctlsocket( ctx->fd, FIONBIO, &n ) );
#else #else
return( fcntl( fd, F_SETFL, fcntl( fd, F_GETFL ) | O_NONBLOCK ) ); return( fcntl( ctx->fd, F_SETFL, fcntl( ctx->fd, F_GETFL ) | O_NONBLOCK ) );
#endif #endif
} }
@ -410,12 +420,12 @@ void mbedtls_net_usleep( unsigned long usec )
*/ */
int mbedtls_net_recv( void *ctx, unsigned char *buf, size_t len ) int mbedtls_net_recv( void *ctx, unsigned char *buf, size_t len )
{ {
int fd = *((int *) ctx); int fd = ((mbedtls_net_context *) ctx)->fd;
int ret = (int) read( fd, buf, len ); int ret = (int) read( fd, buf, len );
if( ret < 0 ) if( ret < 0 )
{ {
if( net_would_block( fd ) != 0 ) if( net_would_block( ctx ) != 0 )
return( MBEDTLS_ERR_SSL_WANT_READ ); return( MBEDTLS_ERR_SSL_WANT_READ );
#if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \ #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
@ -445,7 +455,7 @@ int mbedtls_net_recv_timeout( void *ctx, unsigned char *buf, size_t len,
int ret; int ret;
struct timeval tv; struct timeval tv;
fd_set read_fds; fd_set read_fds;
int fd = *((int *) ctx); int fd = ((mbedtls_net_context *) ctx)->fd;
FD_ZERO( &read_fds ); FD_ZERO( &read_fds );
FD_SET( fd, &read_fds ); FD_SET( fd, &read_fds );
@ -482,12 +492,12 @@ int mbedtls_net_recv_timeout( void *ctx, unsigned char *buf, size_t len,
*/ */
int mbedtls_net_send( void *ctx, const unsigned char *buf, size_t len ) int mbedtls_net_send( void *ctx, const unsigned char *buf, size_t len )
{ {
int fd = *((int *) ctx); int fd = ((mbedtls_net_context *) ctx)->fd;
int ret = (int) write( fd, buf, len ); int ret = (int) write( fd, buf, len );
if( ret < 0 ) if( ret < 0 )
{ {
if( net_would_block( fd ) != 0 ) if( net_would_block( ctx ) != 0 )
return( MBEDTLS_ERR_SSL_WANT_WRITE ); return( MBEDTLS_ERR_SSL_WANT_WRITE );
#if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \ #if ( defined(_WIN32) || defined(_WIN32_WCE) ) && !defined(EFIX64) && \
@ -511,10 +521,15 @@ int mbedtls_net_send( void *ctx, const unsigned char *buf, size_t len )
/* /*
* Gracefully close the connection * Gracefully close the connection
*/ */
void mbedtls_net_close( int fd ) void mbedtls_net_close( mbedtls_net_context *ctx )
{ {
shutdown( fd, 2 ); if( ctx->fd == -1 )
close( fd ); return;
shutdown( ctx->fd, 2 );
close( ctx->fd );
ctx->fd = -1;
} }
#endif /* MBEDTLS_NET_C */ #endif /* MBEDTLS_NET_C */