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102 lines
2.9 KiB
102 lines
2.9 KiB
/* SCTP kernel Implementation: User API extensions.
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*
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* sctp_recvmsg.c
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*
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* Distributed under the terms of the LGPL v2.1 as described in
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* http://www.gnu.org/copyleft/lesser.txt
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*
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* This file is part of the user library that offers support for the
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* SCTP kernel Implementation. The main purpose of this
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* code is to provide the SCTP Socket API mappings for user
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* application to interface with the SCTP in kernel.
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*
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* This implementation is based on the Socket API Extensions for SCTP
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* defined in <draft-ietf-tsvwg-sctpsocket-10.txt>
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*
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* Copyright (c) 2003 International Business Machines, Corp.
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*
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* Written or modified by:
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* Ryan Layer <rmlayer@us.ibm.com>
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*
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* An implementation may provide a library function (or possibly system
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* call) to assist the user with the advanced features of SCTP. Note
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* that in order for the sctp_sndrcvinfo structure to be filled in by
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* sctp_recvmsg() the caller must enable the sctp_data_io_events with
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* the SCTP_EVENTS option.
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*
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* sctp_recvmsg(). Its syntax is,
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*
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* int sctp_recvmsg(int s,
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* void *msg,
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* size_t len,
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* struct sockaddr *from,
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* socklen_t *fromlen,
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* struct sctp_sndrcvinfo *sinfo,
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* int *msg_flags)
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*
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*
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* s - is the socket descriptor
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* msg - is a message buffer to be filled.
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* len - is the length of the message buffer.
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* from - is a pointer to a address to be filled with
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* the sender of this messages address.
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* fromlen - is the from length.
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* sinfo - A pointer to a sctp_sndrcvinfo structure
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* to be filled upon receipt of the message.
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* msg_flags - A pointer to a integer to be filled with
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* any message flags (e.g. MSG_NOTIFICATION).
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*/
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#include <string.h>
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#include <errno.h>
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#include <sys/socket.h> /* struct sockaddr_storage, setsockopt() */
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#include <netinet/sctp.h>
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int sctp_recvmsg(int s, void *msg, size_t len, struct sockaddr *from,
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socklen_t *fromlen, struct sctp_sndrcvinfo *sinfo,
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int *msg_flags)
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{
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int error;
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struct iovec iov;
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struct msghdr inmsg;
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char incmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))];
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struct cmsghdr *cmsg = NULL;
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memset(&inmsg, 0, sizeof (inmsg));
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iov.iov_base = msg;
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iov.iov_len = len;
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inmsg.msg_name = from;
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inmsg.msg_namelen = fromlen ? *fromlen : 0;
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inmsg.msg_iov = &iov;
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inmsg.msg_iovlen = 1;
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inmsg.msg_control = incmsg;
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inmsg.msg_controllen = sizeof(incmsg);
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error = recvmsg(s, &inmsg, msg_flags ? *msg_flags : 0);
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if (error < 0)
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return error;
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if (fromlen)
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*fromlen = inmsg.msg_namelen;
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if (msg_flags)
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*msg_flags = inmsg.msg_flags;
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if (!sinfo)
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return error;
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for (cmsg = CMSG_FIRSTHDR(&inmsg); cmsg != NULL;
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cmsg = CMSG_NXTHDR(&inmsg, cmsg)){
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if ((IPPROTO_SCTP == cmsg->cmsg_level) &&
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(SCTP_SNDRCV == cmsg->cmsg_type))
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break;
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}
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/* Copy sinfo. */
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if (cmsg)
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memcpy(sinfo, CMSG_DATA(cmsg), sizeof(struct sctp_sndrcvinfo));
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return (error);
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}
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