/**************************************************************************** * net/socket/sendto.c * * Copyright (C) 2007-2009, 2011-2015 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include "udp/udp.h" #include "local/local.h" #include "socket/socket.h" #include "usrsock/usrsock.h" /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Function: psock_sendto * * Description: * If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET) * socket, the parameters to and 'tolen' are ignored (and the error EISCONN * may be returned when they are not NULL and 0), and the error ENOTCONN is * returned when the socket was not actually connected. * * Parameters: * psock A pointer to a NuttX-specific, internal socket structure * buf Data to send * len Length of data to send * flags Send flags * to Address of recipient * tolen The length of the address structure * * Returned Value: * On success, returns the number of characters sent. On error, * -1 is returned, and errno is set appropriately: * * EAGAIN or EWOULDBLOCK * The socket is marked non-blocking and the requested operation * would block. * EBADF * An invalid descriptor was specified. * ECONNRESET * Connection reset by peer. * EDESTADDRREQ * The socket is not connection-mode, and no peer address is set. * EFAULT * An invalid user space address was specified for a parameter. * EINTR * A signal occurred before any data was transmitted. * EINVAL * Invalid argument passed. * EISCONN * The connection-mode socket was connected already but a recipient * was specified. (Now either this error is returned, or the recipient * specification is ignored.) * EMSGSIZE * The socket type requires that message be sent atomically, and the * size of the message to be sent made this impossible. * ENOBUFS * The output queue for a network interface was full. This generally * indicates that the interface has stopped sending, but may be * caused by transient congestion. * ENOMEM * No memory available. * ENOTCONN * The socket is not connected, and no target has been given. * ENOTSOCK * The argument s is not a socket. * EOPNOTSUPP * Some bit in the flags argument is inappropriate for the socket * type. * EPIPE * The local end has been shut down on a connection oriented socket. * In this case the process will also receive a SIGPIPE unless * MSG_NOSIGNAL is set. * * Assumptions: * ****************************************************************************/ ssize_t psock_sendto(FAR struct socket *psock, FAR const void *buf, size_t len, int flags, FAR const struct sockaddr *to, socklen_t tolen) { socklen_t minlen; #if defined(CONFIG_NET_UDP) || defined(CONFIG_NET_LOCAL_DGRAM) || \ defined(CONFIG_NET_USRSOCK) ssize_t nsent; #endif int errcode; /* If to is NULL or tolen is zero, then this function is same as send (for * connected socket types) */ if (!to || !tolen) { #if defined(CONFIG_NET_TCP) || defined(CONFIG_NET_LOCAL_STREAM) || \ defined(CONFIG_NET_USRSOCK) return psock_send(psock, buf, len, flags); #else nerr("ERROR: No 'to' address\n"); errcode = EINVAL; goto errout; #endif } #ifdef CONFIG_NET_USRSOCK if (psock->s_type == SOCK_USRSOCK_TYPE) { /* Perform the usrsock sendto operation */ nsent = usrsock_sendto(psock, buf, len, to, tolen); if (nsent < 0) { errcode = -nsent; goto errout; } return nsent; } #endif /* Verify that a valid address has been provided */ switch (to->sa_family) { #ifdef CONFIG_NET_IPv4 case AF_INET: minlen = sizeof(struct sockaddr_in); break; #endif #ifdef CONFIG_NET_IPv6 case AF_INET6: minlen = sizeof(struct sockaddr_in6); break; #endif #ifdef CONFIG_NET_LOCAL_DGRAM case AF_LOCAL: minlen = sizeof(sa_family_t); break; #endif default: nerr("ERROR: Unrecognized address family: %d\n", to->sa_family); errcode = EAFNOSUPPORT; goto errout; } if (tolen < minlen) { nerr("ERROR: Invalid address length: %d < %d\n", tolen, minlen); errcode = EBADF; goto errout; } /* Verify that the psock corresponds to valid, allocated socket */ if (!psock || psock->s_crefs <= 0) { nerr("ERROR: Invalid socket\n"); errcode = EBADF; goto errout; } /* If this is a connected socket, then return EISCONN */ if (psock->s_type != SOCK_DGRAM) { nerr("ERROR: Connected socket\n"); errcode = EISCONN; goto errout; } #if defined(CONFIG_NET_UDP) || defined(CONFIG_NET_LOCAL_DGRAM) /* Now handle the sendto() operation according to the socket domain, * currently either IP or Unix domains. */ #ifdef CONFIG_NET_LOCAL_DGRAM #ifdef CONFIG_NET_UDP if (psock->s_domain == PF_LOCAL) #endif { nsent = psock_local_sendto(psock, buf, len, flags, to, tolen); } #endif /* CONFIG_NET_LOCAL_DGRAM */ #ifdef CONFIG_NET_UDP #ifdef CONFIG_NET_LOCAL_DGRAM else #endif { #ifdef NET_UDP_HAVE_STACK nsent = psock_udp_sendto(psock, buf, len, flags, to, tolen); #else nsent = -ENOSYS; #endif } #endif /* CONFIG_NET_UDP */ /* Check if the domain-specific sendto() logic failed */ if (nsent < 0) { nerr("ERROR: UDP or Unix domain sendto() failed: %ld\n", (long)nsent); errcode = -nsent; goto errout; } return nsent; #else errcode = ENOSYS; #endif /* CONFIG_NET_UDP || CONFIG_NET_LOCAL_DGRAM */ errout: set_errno(errcode); return ERROR; } /**************************************************************************** * Function: sendto * * Description: * If sendto() is used on a connection-mode (SOCK_STREAM, SOCK_SEQPACKET) * socket, the parameters to and 'tolen' are ignored (and the error EISCONN * may be returned when they are not NULL and 0), and the error ENOTCONN is * returned when the socket was not actually connected. * * Parameters: * sockfd Socket descriptor of socket * buf Data to send * len Length of data to send * flags Send flags * to Address of recipient * tolen The length of the address structure * * Returned Value: * On success, returns the number of characters sent. On error, * -1 is returned, and errno is set appropriately: * * EAGAIN or EWOULDBLOCK * The socket is marked non-blocking and the requested operation * would block. * EBADF * An invalid descriptor was specified. * ECONNRESET * Connection reset by peer. * EDESTADDRREQ * The socket is not connection-mode, and no peer address is set. * EFAULT * An invalid user space address was specified for a parameter. * EINTR * A signal occurred before any data was transmitted. * EINVAL * Invalid argument passed. * EISCONN * The connection-mode socket was connected already but a recipient * was specified. (Now either this error is returned, or the recipient * specification is ignored.) * EMSGSIZE * The socket type requires that message be sent atomically, and the * size of the message to be sent made this impossible. * ENOBUFS * The output queue for a network interface was full. This generally * indicates that the interface has stopped sending, but may be * caused by transient congestion. * ENOMEM * No memory available. * ENOTCONN * The socket is not connected, and no target has been given. * ENOTSOCK * The argument s is not a socket. * EOPNOTSUPP * Some bit in the flags argument is inappropriate for the socket * type. * EPIPE * The local end has been shut down on a connection oriented socket. * In this case the process will also receive a SIGPIPE unless * MSG_NOSIGNAL is set. * * Assumptions: * ****************************************************************************/ ssize_t sendto(int sockfd, FAR const void *buf, size_t len, int flags, FAR const struct sockaddr *to, socklen_t tolen) { FAR struct socket *psock; ssize_t ret; /* sendto() is a cancellation point */ (void)enter_cancellation_point(); /* Get the underlying socket structure */ psock = sockfd_socket(sockfd); /* And let psock_sendto do all of the work */ ret = psock_sendto(psock, buf, len, flags, to, tolen); leave_cancellation_point(); return ret; }