701 lines
18 KiB
C
701 lines
18 KiB
C
/*
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* TCP/IP or UDP/IP networking functions
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*/
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/* Enable definition of getaddrinfo() even when compiling with -std=c99. Must
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* be set before config.h, which pulls in glibc's features.h indirectly.
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* Harmless on other platforms. */
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#ifndef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 200112L
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#endif
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#ifndef _XOPEN_SOURCE
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#define _XOPEN_SOURCE 600 /* sockaddr_storage */
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#endif
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#include "common.h"
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#if defined(MBEDTLS_NET_C)
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#if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
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!defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__) && \
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!defined(__HAIKU__) && !defined(__midipix__)
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#error "This module only works on Unix and Windows, see MBEDTLS_NET_C in config.h"
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#endif
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#include "mbedtls/platform.h"
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#include "mbedtls/net_sockets.h"
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#include "mbedtls/error.h"
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#include <string.h>
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#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
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!defined(EFI32)
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#define IS_EINTR(ret) ((ret) == WSAEINTR)
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#if !defined(_WIN32_WINNT)
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/* Enables getaddrinfo() & Co */
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#define _WIN32_WINNT 0x0501
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#endif
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#include <ws2tcpip.h>
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#include <winsock2.h>
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#include <windows.h>
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#if (_WIN32_WINNT < 0x0501)
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#include <wspiapi.h>
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#endif
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#if defined(_MSC_VER)
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#if defined(_WIN32_WCE)
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#pragma comment( lib, "ws2.lib" )
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#else
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#pragma comment( lib, "ws2_32.lib" )
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#endif
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#endif /* _MSC_VER */
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#define read(fd, buf, len) recv(fd, (char *) (buf), (int) (len), 0)
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#define write(fd, buf, len) send(fd, (char *) (buf), (int) (len), 0)
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#define close(fd) closesocket(fd)
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static int wsa_init_done = 0;
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#else /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <errno.h>
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#define IS_EINTR(ret) ((ret) == EINTR)
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#define SOCKET int
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#endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
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/* Some MS functions want int and MSVC warns if we pass size_t,
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* but the standard functions use socklen_t, so cast only for MSVC */
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#if defined(_MSC_VER)
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#define MSVC_INT_CAST (int)
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#else
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#define MSVC_INT_CAST
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#endif
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#include <stdio.h>
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#if defined(MBEDTLS_HAVE_TIME)
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#include <time.h>
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#endif
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#include <stdint.h>
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/*
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* Prepare for using the sockets interface
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*/
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static int net_prepare(void)
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{
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#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
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!defined(EFI32)
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WSADATA wsaData;
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if (wsa_init_done == 0) {
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if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0) {
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return MBEDTLS_ERR_NET_SOCKET_FAILED;
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}
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wsa_init_done = 1;
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}
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#else
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#if !defined(EFIX64) && !defined(EFI32)
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signal(SIGPIPE, SIG_IGN);
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#endif
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#endif
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return 0;
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}
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/*
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* Return 0 if the file descriptor is valid, an error otherwise.
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* If for_select != 0, check whether the file descriptor is within the range
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* allowed for fd_set used for the FD_xxx macros and the select() function.
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*/
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static int check_fd(int fd, int for_select)
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{
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if (fd < 0) {
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return MBEDTLS_ERR_NET_INVALID_CONTEXT;
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}
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#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
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!defined(EFI32)
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(void) for_select;
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#else
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/* A limitation of select() is that it only works with file descriptors
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* that are strictly less than FD_SETSIZE. This is a limitation of the
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* fd_set type. Error out early, because attempting to call FD_SET on a
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* large file descriptor is a buffer overflow on typical platforms. */
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if (for_select && fd >= FD_SETSIZE) {
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return MBEDTLS_ERR_NET_POLL_FAILED;
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}
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#endif
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return 0;
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}
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/*
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* Initialize a context
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*/
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void mbedtls_net_init(mbedtls_net_context *ctx)
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{
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ctx->fd = -1;
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}
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/*
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* Initiate a TCP connection with host:port and the given protocol
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*/
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int mbedtls_net_connect(mbedtls_net_context *ctx, const char *host,
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const char *port, int proto)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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struct addrinfo hints, *addr_list, *cur;
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if ((ret = net_prepare()) != 0) {
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return ret;
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}
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/* Do name resolution with both IPv6 and IPv4 */
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
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hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP;
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if (getaddrinfo(host, port, &hints, &addr_list) != 0) {
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return MBEDTLS_ERR_NET_UNKNOWN_HOST;
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}
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/* Try the sockaddrs until a connection succeeds */
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ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
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for (cur = addr_list; cur != NULL; cur = cur->ai_next) {
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ctx->fd = (int) socket(cur->ai_family, cur->ai_socktype,
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cur->ai_protocol);
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if (ctx->fd < 0) {
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ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
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continue;
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}
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if (connect(ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen) == 0) {
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ret = 0;
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break;
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}
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close(ctx->fd);
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ret = MBEDTLS_ERR_NET_CONNECT_FAILED;
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}
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freeaddrinfo(addr_list);
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return ret;
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}
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/*
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* Create a listening socket on bind_ip:port
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*/
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int mbedtls_net_bind(mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto)
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{
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int n, ret;
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struct addrinfo hints, *addr_list, *cur;
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if ((ret = net_prepare()) != 0) {
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return ret;
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}
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/* Bind to IPv6 and/or IPv4, but only in the desired protocol */
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
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hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP;
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if (bind_ip == NULL) {
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hints.ai_flags = AI_PASSIVE;
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}
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if (getaddrinfo(bind_ip, port, &hints, &addr_list) != 0) {
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return MBEDTLS_ERR_NET_UNKNOWN_HOST;
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}
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/* Try the sockaddrs until a binding succeeds */
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ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
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for (cur = addr_list; cur != NULL; cur = cur->ai_next) {
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ctx->fd = (int) socket(cur->ai_family, cur->ai_socktype,
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cur->ai_protocol);
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if (ctx->fd < 0) {
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ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
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continue;
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}
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n = 1;
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if (setsockopt(ctx->fd, SOL_SOCKET, SO_REUSEADDR,
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(const char *) &n, sizeof(n)) != 0) {
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close(ctx->fd);
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ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
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continue;
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}
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if (bind(ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen) != 0) {
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close(ctx->fd);
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ret = MBEDTLS_ERR_NET_BIND_FAILED;
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continue;
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}
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/* Listen only makes sense for TCP */
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if (proto == MBEDTLS_NET_PROTO_TCP) {
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if (listen(ctx->fd, MBEDTLS_NET_LISTEN_BACKLOG) != 0) {
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close(ctx->fd);
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ret = MBEDTLS_ERR_NET_LISTEN_FAILED;
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continue;
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}
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}
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/* Bind was successful */
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ret = 0;
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break;
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}
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freeaddrinfo(addr_list);
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return ret;
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}
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#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
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!defined(EFI32)
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/*
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* Check if the requested operation would be blocking on a non-blocking socket
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* and thus 'failed' with a negative return value.
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*/
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static int net_would_block(const mbedtls_net_context *ctx)
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{
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((void) ctx);
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return WSAGetLastError() == WSAEWOULDBLOCK;
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}
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#else
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/*
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* Check if the requested operation would be blocking on a non-blocking socket
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* and thus 'failed' with a negative return value.
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*
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* Note: on a blocking socket this function always returns 0!
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*/
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static int net_would_block(const mbedtls_net_context *ctx)
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{
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int err = errno;
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/*
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* Never return 'WOULD BLOCK' on a blocking socket
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*/
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if ((fcntl(ctx->fd, F_GETFL) & O_NONBLOCK) != O_NONBLOCK) {
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errno = err;
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return 0;
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}
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switch (errno = err) {
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#if defined EAGAIN
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case EAGAIN:
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#endif
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#if defined EWOULDBLOCK && EWOULDBLOCK != EAGAIN
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case EWOULDBLOCK:
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#endif
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return 1;
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}
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return 0;
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}
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#endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
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/*
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* Accept a connection from a remote client
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*/
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int mbedtls_net_accept(mbedtls_net_context *bind_ctx,
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mbedtls_net_context *client_ctx,
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void *client_ip, size_t buf_size, size_t *cip_len)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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int type;
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struct sockaddr_storage client_addr;
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#if defined(__socklen_t_defined) || defined(_SOCKLEN_T) || \
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defined(_SOCKLEN_T_DECLARED) || defined(__DEFINED_socklen_t) || \
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defined(socklen_t) || (defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L)
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socklen_t n = (socklen_t) sizeof(client_addr);
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socklen_t type_len = (socklen_t) sizeof(type);
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#else
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int n = (int) sizeof(client_addr);
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int type_len = (int) sizeof(type);
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#endif
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/* Is this a TCP or UDP socket? */
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if (getsockopt(bind_ctx->fd, SOL_SOCKET, SO_TYPE,
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(void *) &type, &type_len) != 0 ||
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(type != SOCK_STREAM && type != SOCK_DGRAM)) {
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return MBEDTLS_ERR_NET_ACCEPT_FAILED;
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}
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if (type == SOCK_STREAM) {
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/* TCP: actual accept() */
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ret = client_ctx->fd = (int) accept(bind_ctx->fd,
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(struct sockaddr *) &client_addr, &n);
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} else {
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/* UDP: wait for a message, but keep it in the queue */
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char buf[1] = { 0 };
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ret = (int) recvfrom(bind_ctx->fd, buf, sizeof(buf), MSG_PEEK,
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(struct sockaddr *) &client_addr, &n);
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#if defined(_WIN32)
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if (ret == SOCKET_ERROR &&
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WSAGetLastError() == WSAEMSGSIZE) {
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/* We know buf is too small, thanks, just peeking here */
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ret = 0;
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}
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#endif
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}
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if (ret < 0) {
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if (net_would_block(bind_ctx) != 0) {
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return MBEDTLS_ERR_SSL_WANT_READ;
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}
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return MBEDTLS_ERR_NET_ACCEPT_FAILED;
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}
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/* UDP: hijack the listening socket to communicate with the client,
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* then bind a new socket to accept new connections */
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if (type != SOCK_STREAM) {
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struct sockaddr_storage local_addr;
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int one = 1;
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if (connect(bind_ctx->fd, (struct sockaddr *) &client_addr, n) != 0) {
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return MBEDTLS_ERR_NET_ACCEPT_FAILED;
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}
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client_ctx->fd = bind_ctx->fd;
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bind_ctx->fd = -1; /* In case we exit early */
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n = sizeof(struct sockaddr_storage);
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if (getsockname(client_ctx->fd,
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(struct sockaddr *) &local_addr, &n) != 0 ||
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(bind_ctx->fd = (int) socket(local_addr.ss_family,
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SOCK_DGRAM, IPPROTO_UDP)) < 0 ||
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setsockopt(bind_ctx->fd, SOL_SOCKET, SO_REUSEADDR,
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(const char *) &one, sizeof(one)) != 0) {
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return MBEDTLS_ERR_NET_SOCKET_FAILED;
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}
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if (bind(bind_ctx->fd, (struct sockaddr *) &local_addr, n) != 0) {
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return MBEDTLS_ERR_NET_BIND_FAILED;
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}
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}
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if (client_ip != NULL) {
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if (client_addr.ss_family == AF_INET) {
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struct sockaddr_in *addr4 = (struct sockaddr_in *) &client_addr;
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*cip_len = sizeof(addr4->sin_addr.s_addr);
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if (buf_size < *cip_len) {
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return MBEDTLS_ERR_NET_BUFFER_TOO_SMALL;
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}
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memcpy(client_ip, &addr4->sin_addr.s_addr, *cip_len);
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} else {
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struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) &client_addr;
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*cip_len = sizeof(addr6->sin6_addr.s6_addr);
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if (buf_size < *cip_len) {
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return MBEDTLS_ERR_NET_BUFFER_TOO_SMALL;
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}
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memcpy(client_ip, &addr6->sin6_addr.s6_addr, *cip_len);
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}
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}
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return 0;
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}
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/*
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* Set the socket blocking or non-blocking
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*/
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int mbedtls_net_set_block(mbedtls_net_context *ctx)
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{
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#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
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!defined(EFI32)
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u_long n = 0;
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return ioctlsocket(ctx->fd, FIONBIO, &n);
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#else
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return fcntl(ctx->fd, F_SETFL, fcntl(ctx->fd, F_GETFL) & ~O_NONBLOCK);
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#endif
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}
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int mbedtls_net_set_nonblock(mbedtls_net_context *ctx)
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{
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#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
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!defined(EFI32)
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u_long n = 1;
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return ioctlsocket(ctx->fd, FIONBIO, &n);
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#else
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return fcntl(ctx->fd, F_SETFL, fcntl(ctx->fd, F_GETFL) | O_NONBLOCK);
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#endif
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}
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/*
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* Check if data is available on the socket
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*/
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int mbedtls_net_poll(mbedtls_net_context *ctx, uint32_t rw, uint32_t timeout)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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struct timeval tv;
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fd_set read_fds;
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fd_set write_fds;
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int fd = ctx->fd;
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ret = check_fd(fd, 1);
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if (ret != 0) {
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return ret;
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}
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#if defined(__has_feature)
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#if __has_feature(memory_sanitizer)
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/* Ensure that memory sanitizers consider read_fds and write_fds as
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* initialized even on platforms such as Glibc/x86_64 where FD_ZERO
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* is implemented in assembly. */
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memset(&read_fds, 0, sizeof(read_fds));
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memset(&write_fds, 0, sizeof(write_fds));
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#endif
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#endif
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FD_ZERO(&read_fds);
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if (rw & MBEDTLS_NET_POLL_READ) {
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rw &= ~MBEDTLS_NET_POLL_READ;
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FD_SET((SOCKET) fd, &read_fds);
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}
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FD_ZERO(&write_fds);
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if (rw & MBEDTLS_NET_POLL_WRITE) {
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rw &= ~MBEDTLS_NET_POLL_WRITE;
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FD_SET((SOCKET) fd, &write_fds);
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}
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if (rw != 0) {
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return MBEDTLS_ERR_NET_BAD_INPUT_DATA;
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}
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tv.tv_sec = timeout / 1000;
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tv.tv_usec = (timeout % 1000) * 1000;
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do {
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ret = select(fd + 1, &read_fds, &write_fds, NULL,
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timeout == (uint32_t) -1 ? NULL : &tv);
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} while (IS_EINTR(ret));
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if (ret < 0) {
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return MBEDTLS_ERR_NET_POLL_FAILED;
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}
|
|
|
|
ret = 0;
|
|
if (FD_ISSET(fd, &read_fds)) {
|
|
ret |= MBEDTLS_NET_POLL_READ;
|
|
}
|
|
if (FD_ISSET(fd, &write_fds)) {
|
|
ret |= MBEDTLS_NET_POLL_WRITE;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Portable usleep helper
|
|
*/
|
|
void mbedtls_net_usleep(unsigned long usec)
|
|
{
|
|
#if defined(_WIN32)
|
|
Sleep((usec + 999) / 1000);
|
|
#else
|
|
struct timeval tv;
|
|
tv.tv_sec = usec / 1000000;
|
|
#if defined(__unix__) || defined(__unix) || \
|
|
(defined(__APPLE__) && defined(__MACH__))
|
|
tv.tv_usec = (suseconds_t) usec % 1000000;
|
|
#else
|
|
tv.tv_usec = usec % 1000000;
|
|
#endif
|
|
select(0, NULL, NULL, NULL, &tv);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Read at most 'len' characters
|
|
*/
|
|
int mbedtls_net_recv(void *ctx, unsigned char *buf, size_t len)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
int fd = ((mbedtls_net_context *) ctx)->fd;
|
|
|
|
ret = check_fd(fd, 0);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
|
|
ret = (int) read(fd, buf, len);
|
|
|
|
if (ret < 0) {
|
|
if (net_would_block(ctx) != 0) {
|
|
return MBEDTLS_ERR_SSL_WANT_READ;
|
|
}
|
|
|
|
#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
|
|
!defined(EFI32)
|
|
if (WSAGetLastError() == WSAECONNRESET) {
|
|
return MBEDTLS_ERR_NET_CONN_RESET;
|
|
}
|
|
#else
|
|
if (errno == EPIPE || errno == ECONNRESET) {
|
|
return MBEDTLS_ERR_NET_CONN_RESET;
|
|
}
|
|
|
|
if (errno == EINTR) {
|
|
return MBEDTLS_ERR_SSL_WANT_READ;
|
|
}
|
|
#endif
|
|
|
|
return MBEDTLS_ERR_NET_RECV_FAILED;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Read at most 'len' characters, blocking for at most 'timeout' ms
|
|
*/
|
|
int mbedtls_net_recv_timeout(void *ctx, unsigned char *buf,
|
|
size_t len, uint32_t timeout)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
struct timeval tv;
|
|
fd_set read_fds;
|
|
int fd = ((mbedtls_net_context *) ctx)->fd;
|
|
|
|
ret = check_fd(fd, 1);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
|
|
FD_ZERO(&read_fds);
|
|
FD_SET((SOCKET) fd, &read_fds);
|
|
|
|
tv.tv_sec = timeout / 1000;
|
|
tv.tv_usec = (timeout % 1000) * 1000;
|
|
|
|
ret = select(fd + 1, &read_fds, NULL, NULL, timeout == 0 ? NULL : &tv);
|
|
|
|
/* Zero fds ready means we timed out */
|
|
if (ret == 0) {
|
|
return MBEDTLS_ERR_SSL_TIMEOUT;
|
|
}
|
|
|
|
if (ret < 0) {
|
|
#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
|
|
!defined(EFI32)
|
|
if (WSAGetLastError() == WSAEINTR) {
|
|
return MBEDTLS_ERR_SSL_WANT_READ;
|
|
}
|
|
#else
|
|
if (errno == EINTR) {
|
|
return MBEDTLS_ERR_SSL_WANT_READ;
|
|
}
|
|
#endif
|
|
|
|
return MBEDTLS_ERR_NET_RECV_FAILED;
|
|
}
|
|
|
|
/* This call will not block */
|
|
return mbedtls_net_recv(ctx, buf, len);
|
|
}
|
|
|
|
/*
|
|
* Write at most 'len' characters
|
|
*/
|
|
int mbedtls_net_send(void *ctx, const unsigned char *buf, size_t len)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
int fd = ((mbedtls_net_context *) ctx)->fd;
|
|
|
|
ret = check_fd(fd, 0);
|
|
if (ret != 0) {
|
|
return ret;
|
|
}
|
|
|
|
ret = (int) write(fd, buf, len);
|
|
|
|
if (ret < 0) {
|
|
if (net_would_block(ctx) != 0) {
|
|
return MBEDTLS_ERR_SSL_WANT_WRITE;
|
|
}
|
|
|
|
#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
|
|
!defined(EFI32)
|
|
if (WSAGetLastError() == WSAECONNRESET) {
|
|
return MBEDTLS_ERR_NET_CONN_RESET;
|
|
}
|
|
#else
|
|
if (errno == EPIPE || errno == ECONNRESET) {
|
|
return MBEDTLS_ERR_NET_CONN_RESET;
|
|
}
|
|
|
|
if (errno == EINTR) {
|
|
return MBEDTLS_ERR_SSL_WANT_WRITE;
|
|
}
|
|
#endif
|
|
|
|
return MBEDTLS_ERR_NET_SEND_FAILED;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Close the connection
|
|
*/
|
|
void mbedtls_net_close(mbedtls_net_context *ctx)
|
|
{
|
|
if (ctx->fd == -1) {
|
|
return;
|
|
}
|
|
|
|
close(ctx->fd);
|
|
|
|
ctx->fd = -1;
|
|
}
|
|
|
|
/*
|
|
* Gracefully close the connection
|
|
*/
|
|
void mbedtls_net_free(mbedtls_net_context *ctx)
|
|
{
|
|
if (ctx->fd == -1) {
|
|
return;
|
|
}
|
|
|
|
shutdown(ctx->fd, 2);
|
|
close(ctx->fd);
|
|
|
|
ctx->fd = -1;
|
|
}
|
|
|
|
#endif /* MBEDTLS_NET_C */
|