initial commit, 4.5 stable

thirdparty/mbedtls/library/net_sockets.c

@@ -0,0 +1,696 @@
+/*
+ *  TCP/IP or UDP/IP networking functions
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+/* Enable definition of getaddrinfo() even when compiling with -std=c99. Must
+ * be set before mbedtls_config.h, which pulls in glibc's features.h indirectly.
+ * Harmless on other platforms. */
+#ifndef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200112L
+#endif
+#ifndef _XOPEN_SOURCE
+#define _XOPEN_SOURCE 600 /* sockaddr_storage */
+#endif
+
+#include "common.h"
+
+#if defined(MBEDTLS_NET_C)
+
+#if !defined(unix) && !defined(__unix__) && !defined(__unix) && \
+    !defined(__APPLE__) && !defined(_WIN32) && !defined(__QNXNTO__) && \
+    !defined(__HAIKU__) && !defined(__midipix__)
+#error "This module only works on Unix and Windows, see MBEDTLS_NET_C in mbedtls_config.h"
+#endif
+
+#include "mbedtls/platform.h"
+
+#include "mbedtls/net_sockets.h"
+#include "mbedtls/error.h"
+
+#include <string.h>
+
+#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
+    !defined(EFI32)
+
+#define IS_EINTR(ret) ((ret) == WSAEINTR)
+
+#include <ws2tcpip.h>
+
+#include <winsock2.h>
+#include <windows.h>
+#if (_WIN32_WINNT < 0x0501)
+#include <wspiapi.h>
+#endif
+
+#if defined(_MSC_VER)
+#if defined(_WIN32_WCE)
+#pragma comment( lib, "ws2.lib" )
+#else
+#pragma comment( lib, "ws2_32.lib" )
+#endif
+#endif /* _MSC_VER */
+
+#define read(fd, buf, len)        recv(fd, (char *) (buf), (int) (len), 0)
+#define write(fd, buf, len)       send(fd, (char *) (buf), (int) (len), 0)
+#define close(fd)               closesocket(fd)
+
+static int wsa_init_done = 0;
+
+#else /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <errno.h>
+
+#define IS_EINTR(ret) ((ret) == EINTR)
+#define SOCKET int
+
+#endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
+
+/* Some MS functions want int and MSVC warns if we pass size_t,
+ * but the standard functions use socklen_t, so cast only for MSVC */
+#if defined(_MSC_VER)
+#define MSVC_INT_CAST   (int)
+#else
+#define MSVC_INT_CAST
+#endif
+
+#include <stdio.h>
+
+#if defined(MBEDTLS_HAVE_TIME)
+#include <time.h>
+#endif
+
+#include <stdint.h>
+
+/*
+ * Prepare for using the sockets interface
+ */
+static int net_prepare(void)
+{
+#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
+    !defined(EFI32)
+    WSADATA wsaData;
+
+    if (wsa_init_done == 0) {
+        if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0) {
+            return MBEDTLS_ERR_NET_SOCKET_FAILED;
+        }
+
+        wsa_init_done = 1;
+    }
+#else
+#if !defined(EFIX64) && !defined(EFI32)
+    signal(SIGPIPE, SIG_IGN);
+#endif
+#endif
+    return 0;
+}
+
+/*
+ * Return 0 if the file descriptor is valid, an error otherwise.
+ * If for_select != 0, check whether the file descriptor is within the range
+ * allowed for fd_set used for the FD_xxx macros and the select() function.
+ */
+static int check_fd(int fd, int for_select)
+{
+    if (fd < 0) {
+        return MBEDTLS_ERR_NET_INVALID_CONTEXT;
+    }
+
+#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
+    !defined(EFI32)
+    (void) for_select;
+#else
+    /* A limitation of select() is that it only works with file descriptors
+     * that are strictly less than FD_SETSIZE. This is a limitation of the
+     * fd_set type. Error out early, because attempting to call FD_SET on a
+     * large file descriptor is a buffer overflow on typical platforms. */
+    if (for_select && fd >= FD_SETSIZE) {
+        return MBEDTLS_ERR_NET_POLL_FAILED;
+    }
+#endif
+
+    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
+ */
+int mbedtls_net_connect(mbedtls_net_context *ctx, const char *host,
+                        const char *port, int proto)
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    struct addrinfo hints, *addr_list, *cur;
+
+    if ((ret = net_prepare()) != 0) {
+        return ret;
+    }
+
+    /* Do name resolution with both IPv6 and IPv4 */
+    memset(&hints, 0, sizeof(hints));
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
+    hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP;
+
+    if (getaddrinfo(host, port, &hints, &addr_list) != 0) {
+        return MBEDTLS_ERR_NET_UNKNOWN_HOST;
+    }
+
+    /* Try the sockaddrs until a connection succeeds */
+    ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
+    for (cur = addr_list; cur != NULL; cur = cur->ai_next) {
+        ctx->fd = (int) socket(cur->ai_family, cur->ai_socktype,
+                               cur->ai_protocol);
+        if (ctx->fd < 0) {
+            ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
+            continue;
+        }
+
+        if (connect(ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen) == 0) {
+            ret = 0;
+            break;
+        }
+
+        mbedtls_net_close(ctx);
+        ret = MBEDTLS_ERR_NET_CONNECT_FAILED;
+    }
+
+    freeaddrinfo(addr_list);
+
+    return ret;
+}
+
+/*
+ * Create a listening socket on bind_ip:port
+ */
+int mbedtls_net_bind(mbedtls_net_context *ctx, const char *bind_ip, const char *port, int proto)
+{
+    int n, ret;
+    struct addrinfo hints, *addr_list, *cur;
+
+    if ((ret = net_prepare()) != 0) {
+        return ret;
+    }
+
+    /* Bind to IPv6 and/or IPv4, but only in the desired protocol */
+    memset(&hints, 0, sizeof(hints));
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_socktype = proto == MBEDTLS_NET_PROTO_UDP ? SOCK_DGRAM : SOCK_STREAM;
+    hints.ai_protocol = proto == MBEDTLS_NET_PROTO_UDP ? IPPROTO_UDP : IPPROTO_TCP;
+    if (bind_ip == NULL) {
+        hints.ai_flags = AI_PASSIVE;
+    }
+
+    if (getaddrinfo(bind_ip, port, &hints, &addr_list) != 0) {
+        return MBEDTLS_ERR_NET_UNKNOWN_HOST;
+    }
+
+    /* Try the sockaddrs until a binding succeeds */
+    ret = MBEDTLS_ERR_NET_UNKNOWN_HOST;
+    for (cur = addr_list; cur != NULL; cur = cur->ai_next) {
+        ctx->fd = (int) socket(cur->ai_family, cur->ai_socktype,
+                               cur->ai_protocol);
+        if (ctx->fd < 0) {
+            ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
+            continue;
+        }
+
+        n = 1;
+        if (setsockopt(ctx->fd, SOL_SOCKET, SO_REUSEADDR,
+                       (const char *) &n, sizeof(n)) != 0) {
+            mbedtls_net_close(ctx);
+            ret = MBEDTLS_ERR_NET_SOCKET_FAILED;
+            continue;
+        }
+
+        if (bind(ctx->fd, cur->ai_addr, MSVC_INT_CAST cur->ai_addrlen) != 0) {
+            mbedtls_net_close(ctx);
+            ret = MBEDTLS_ERR_NET_BIND_FAILED;
+            continue;
+        }
+
+        /* Listen only makes sense for TCP */
+        if (proto == MBEDTLS_NET_PROTO_TCP) {
+            if (listen(ctx->fd, MBEDTLS_NET_LISTEN_BACKLOG) != 0) {
+                mbedtls_net_close(ctx);
+                ret = MBEDTLS_ERR_NET_LISTEN_FAILED;
+                continue;
+            }
+        }
+
+        /* Bind was successful */
+        ret = 0;
+        break;
+    }
+
+    freeaddrinfo(addr_list);
+
+    return ret;
+
+}
+
+#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
+    !defined(EFI32)
+/*
+ * Check if the requested operation would be blocking on a non-blocking socket
+ * and thus 'failed' with a negative return value.
+ */
+static int net_would_block(const mbedtls_net_context *ctx)
+{
+    ((void) ctx);
+    return WSAGetLastError() == WSAEWOULDBLOCK;
+}
+#else
+/*
+ * Check if the requested operation would be blocking on a non-blocking socket
+ * and thus 'failed' with a negative return value.
+ *
+ * Note: on a blocking socket this function always returns 0!
+ */
+static int net_would_block(const mbedtls_net_context *ctx)
+{
+    int err = errno;
+
+    /*
+     * Never return 'WOULD BLOCK' on a blocking socket
+     */
+    if ((fcntl(ctx->fd, F_GETFL) & O_NONBLOCK) != O_NONBLOCK) {
+        errno = err;
+        return 0;
+    }
+
+    switch (errno = err) {
+#if defined EAGAIN
+        case EAGAIN:
+#endif
+#if defined EWOULDBLOCK && EWOULDBLOCK != EAGAIN
+        case EWOULDBLOCK:
+#endif
+    return 1;
+    }
+    return 0;
+}
+#endif /* ( _WIN32 || _WIN32_WCE ) && !EFIX64 && !EFI32 */
+
+/*
+ * Accept a connection from a remote client
+ */
+int mbedtls_net_accept(mbedtls_net_context *bind_ctx,
+                       mbedtls_net_context *client_ctx,
+                       void *client_ip, size_t buf_size, size_t *cip_len)
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    int type;
+
+    struct sockaddr_storage client_addr;
+
+#if defined(__socklen_t_defined) || defined(_SOCKLEN_T) ||  \
+    defined(_SOCKLEN_T_DECLARED) || defined(__DEFINED_socklen_t) || \
+    defined(socklen_t) || (defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L)
+    socklen_t n = (socklen_t) sizeof(client_addr);
+    socklen_t type_len = (socklen_t) sizeof(type);
+#else
+    int n = (int) sizeof(client_addr);
+    int type_len = (int) sizeof(type);
+#endif
+
+    /* Is this a TCP or UDP socket? */
+    if (getsockopt(bind_ctx->fd, SOL_SOCKET, SO_TYPE,
+                   (void *) &type, &type_len) != 0 ||
+        (type != SOCK_STREAM && type != SOCK_DGRAM)) {
+        return MBEDTLS_ERR_NET_ACCEPT_FAILED;
+    }
+
+    if (type == SOCK_STREAM) {
+        /* TCP: actual accept() */
+        ret = client_ctx->fd = (int) accept(bind_ctx->fd,
+                                            (struct sockaddr *) &client_addr, &n);
+    } else {
+        /* UDP: wait for a message, but keep it in the queue */
+        char buf[1] = { 0 };
+
+        ret = (int) recvfrom(bind_ctx->fd, buf, sizeof(buf), MSG_PEEK,
+                             (struct sockaddr *) &client_addr, &n);
+
+#if defined(_WIN32)
+        if (ret == SOCKET_ERROR &&
+            WSAGetLastError() == WSAEMSGSIZE) {
+            /* We know buf is too small, thanks, just peeking here */
+            ret = 0;
+        }
+#endif
+    }
+
+    if (ret < 0) {
+        if (net_would_block(bind_ctx) != 0) {
+            return MBEDTLS_ERR_SSL_WANT_READ;
+        }
+
+        return MBEDTLS_ERR_NET_ACCEPT_FAILED;
+    }
+
+    /* UDP: hijack the listening socket to communicate with the client,
+     * then bind a new socket to accept new connections */
+    if (type != SOCK_STREAM) {
+        struct sockaddr_storage local_addr;
+        int one = 1;
+
+        if (connect(bind_ctx->fd, (struct sockaddr *) &client_addr, n) != 0) {
+            return MBEDTLS_ERR_NET_ACCEPT_FAILED;
+        }
+
+        client_ctx->fd = bind_ctx->fd;
+        bind_ctx->fd   = -1; /* In case we exit early */
+
+        n = sizeof(struct sockaddr_storage);
+        if (getsockname(client_ctx->fd,
+                        (struct sockaddr *) &local_addr, &n) != 0 ||
+            (bind_ctx->fd = (int) socket(local_addr.ss_family,
+                                         SOCK_DGRAM, IPPROTO_UDP)) < 0 ||
+            setsockopt(bind_ctx->fd, SOL_SOCKET, SO_REUSEADDR,
+                       (const char *) &one, sizeof(one)) != 0) {
+            return MBEDTLS_ERR_NET_SOCKET_FAILED;
+        }
+
+        if (bind(bind_ctx->fd, (struct sockaddr *) &local_addr, n) != 0) {
+            return MBEDTLS_ERR_NET_BIND_FAILED;
+        }
+    }
+
+    if (client_ip != NULL) {
+        if (client_addr.ss_family == AF_INET) {
+            struct sockaddr_in *addr4 = (struct sockaddr_in *) &client_addr;
+            *cip_len = sizeof(addr4->sin_addr.s_addr);
+
+            if (buf_size < *cip_len) {
+                return MBEDTLS_ERR_NET_BUFFER_TOO_SMALL;
+            }
+
+            memcpy(client_ip, &addr4->sin_addr.s_addr, *cip_len);
+        } else {
+            struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) &client_addr;
+            *cip_len = sizeof(addr6->sin6_addr.s6_addr);
+
+            if (buf_size < *cip_len) {
+                return MBEDTLS_ERR_NET_BUFFER_TOO_SMALL;
+            }
+
+            memcpy(client_ip, &addr6->sin6_addr.s6_addr, *cip_len);
+        }
+    }
+
+    return 0;
+}
+
+/*
+ * Set the socket blocking or non-blocking
+ */
+int mbedtls_net_set_block(mbedtls_net_context *ctx)
+{
+#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
+    !defined(EFI32)
+    u_long n = 0;
+    return ioctlsocket(ctx->fd, FIONBIO, &n);
+#else
+    return fcntl(ctx->fd, F_SETFL, fcntl(ctx->fd, F_GETFL) & ~O_NONBLOCK);
+#endif
+}
+
+int mbedtls_net_set_nonblock(mbedtls_net_context *ctx)
+{
+#if (defined(_WIN32) || defined(_WIN32_WCE)) && !defined(EFIX64) && \
+    !defined(EFI32)
+    u_long n = 1;
+    return ioctlsocket(ctx->fd, FIONBIO, &n);
+#else
+    return fcntl(ctx->fd, F_SETFL, fcntl(ctx->fd, F_GETFL) | O_NONBLOCK);
+#endif
+}
+
+/*
+ * Check if data is available on the socket
+ */
+
+int mbedtls_net_poll(mbedtls_net_context *ctx, uint32_t rw, uint32_t timeout)
+{
+    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+    struct timeval tv;
+
+    fd_set read_fds;
+    fd_set write_fds;
+
+    int fd = ctx->fd;
+
+    ret = check_fd(fd, 1);
+    if (ret != 0) {
+        return ret;
+    }
+
+#if defined(__has_feature)
+#if __has_feature(memory_sanitizer)
+    /* Ensure that memory sanitizers consider read_fds and write_fds as
+     * initialized even on platforms such as Glibc/x86_64 where FD_ZERO
+     * is implemented in assembly. */
+    memset(&read_fds, 0, sizeof(read_fds));
+    memset(&write_fds, 0, sizeof(write_fds));
+#endif
+#endif
+
+    FD_ZERO(&read_fds);
+    if (rw & MBEDTLS_NET_POLL_READ) {
+        rw &= ~MBEDTLS_NET_POLL_READ;
+        FD_SET((SOCKET) fd, &read_fds);
+    }
+
+    FD_ZERO(&write_fds);
+    if (rw & MBEDTLS_NET_POLL_WRITE) {
+        rw &= ~MBEDTLS_NET_POLL_WRITE;
+        FD_SET((SOCKET) fd, &write_fds);
+    }
+
+    if (rw != 0) {
+        return MBEDTLS_ERR_NET_BAD_INPUT_DATA;
+    }
+
+    tv.tv_sec  = timeout / 1000;
+    tv.tv_usec = (timeout % 1000) * 1000;
+
+    do {
+        ret = select(fd + 1, &read_fds, &write_fds, NULL,
+                     timeout == (uint32_t) -1 ? NULL : &tv);
+    } while (IS_EINTR(ret));
+
+    if (ret < 0) {
+        return MBEDTLS_ERR_NET_POLL_FAILED;
+    }
+
+    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__))) && !defined(__DJGPP__)
+    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 == NULL || ctx->fd == -1) {
+        return;
+    }
+
+    shutdown(ctx->fd, 2);
+    close(ctx->fd);
+
+    ctx->fd = -1;
+}
+
+#endif /* MBEDTLS_NET_C */