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4c13f63cba
MFC after: 3 days
233 lines
5.8 KiB
C
233 lines
5.8 KiB
C
/*-
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* Copyright (c) 2009-2010 The FreeBSD Foundation
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* Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net>
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* All rights reserved.
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*
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* This software was developed by Pawel Jakub Dawidek under sponsorship from
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* the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <strings.h>
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#include <unistd.h>
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#include "pjdlog.h"
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#include "proto_impl.h"
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/* Maximum size of packet we want to use when sending data. */
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#ifndef MAX_SEND_SIZE
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#define MAX_SEND_SIZE 32768
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#endif
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static bool
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blocking_socket(int sock)
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{
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int flags;
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flags = fcntl(sock, F_GETFL);
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PJDLOG_ASSERT(flags >= 0);
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return ((flags & O_NONBLOCK) == 0);
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}
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static int
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proto_descriptor_send(int sock, int fd)
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{
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unsigned char ctrl[CMSG_SPACE(sizeof(fd))];
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struct msghdr msg;
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struct cmsghdr *cmsg;
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PJDLOG_ASSERT(sock >= 0);
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PJDLOG_ASSERT(fd >= 0);
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bzero(&msg, sizeof(msg));
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bzero(&ctrl, sizeof(ctrl));
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msg.msg_iov = NULL;
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msg.msg_iovlen = 0;
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msg.msg_control = ctrl;
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msg.msg_controllen = sizeof(ctrl);
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cmsg = CMSG_FIRSTHDR(&msg);
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cmsg->cmsg_level = SOL_SOCKET;
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cmsg->cmsg_type = SCM_RIGHTS;
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cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
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bcopy(&fd, CMSG_DATA(cmsg), sizeof(fd));
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if (sendmsg(sock, &msg, 0) == -1)
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return (errno);
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return (0);
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}
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int
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proto_common_send(int sock, const unsigned char *data, size_t size, int fd)
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{
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ssize_t done;
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size_t sendsize;
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int errcount = 0;
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PJDLOG_ASSERT(sock >= 0);
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if (data == NULL) {
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/* The caller is just trying to decide about direction. */
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PJDLOG_ASSERT(size == 0);
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if (shutdown(sock, SHUT_RD) == -1)
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return (errno);
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return (0);
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}
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PJDLOG_ASSERT(data != NULL);
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PJDLOG_ASSERT(size > 0);
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do {
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sendsize = size < MAX_SEND_SIZE ? size : MAX_SEND_SIZE;
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done = send(sock, data, sendsize, MSG_NOSIGNAL);
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if (done == 0) {
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return (ENOTCONN);
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} else if (done == -1) {
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if (errno == EINTR)
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continue;
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if (errno == ENOBUFS) {
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/*
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* If there are no buffers we retry.
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* After each try we increase delay before the
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* next one and we give up after fifteen times.
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* This gives 11s of total wait time.
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*/
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if (errcount == 15) {
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pjdlog_warning("Getting ENOBUFS errors for 11s on send(), giving up.");
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} else {
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if (errcount == 0)
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pjdlog_warning("Got ENOBUFS error on send(), retrying for a bit.");
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errcount++;
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usleep(100000 * errcount);
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continue;
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}
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}
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/*
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* If this is blocking socket and we got EAGAIN, this
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* means the request timed out. Translate errno to
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* ETIMEDOUT, to give administrator a hint to
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* eventually increase timeout.
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*/
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if (errno == EAGAIN && blocking_socket(sock))
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errno = ETIMEDOUT;
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return (errno);
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}
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data += done;
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size -= done;
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} while (size > 0);
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if (errcount > 0) {
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pjdlog_info("Data sent successfully after %d ENOBUFS error%s.",
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errcount, errcount == 1 ? "" : "s");
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}
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if (fd == -1)
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return (0);
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return (proto_descriptor_send(sock, fd));
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}
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static int
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proto_descriptor_recv(int sock, int *fdp)
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{
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unsigned char ctrl[CMSG_SPACE(sizeof(*fdp))];
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struct msghdr msg;
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struct cmsghdr *cmsg;
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PJDLOG_ASSERT(sock >= 0);
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PJDLOG_ASSERT(fdp != NULL);
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bzero(&msg, sizeof(msg));
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bzero(&ctrl, sizeof(ctrl));
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msg.msg_iov = NULL;
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msg.msg_iovlen = 0;
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msg.msg_control = ctrl;
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msg.msg_controllen = sizeof(ctrl);
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if (recvmsg(sock, &msg, 0) == -1)
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return (errno);
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cmsg = CMSG_FIRSTHDR(&msg);
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if (cmsg == NULL || cmsg->cmsg_level != SOL_SOCKET ||
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cmsg->cmsg_type != SCM_RIGHTS) {
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return (EINVAL);
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}
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bcopy(CMSG_DATA(cmsg), fdp, sizeof(*fdp));
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return (0);
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}
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int
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proto_common_recv(int sock, unsigned char *data, size_t size, int *fdp)
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{
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ssize_t done;
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PJDLOG_ASSERT(sock >= 0);
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if (data == NULL) {
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/* The caller is just trying to decide about direction. */
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PJDLOG_ASSERT(size == 0);
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if (shutdown(sock, SHUT_WR) == -1)
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return (errno);
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return (0);
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}
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PJDLOG_ASSERT(data != NULL);
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PJDLOG_ASSERT(size > 0);
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do {
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done = recv(sock, data, size, MSG_WAITALL);
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} while (done == -1 && errno == EINTR);
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if (done == 0) {
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return (ENOTCONN);
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} else if (done == -1) {
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/*
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* If this is blocking socket and we got EAGAIN, this
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* means the request timed out. Translate errno to
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* ETIMEDOUT, to give administrator a hint to
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* eventually increase timeout.
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*/
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if (errno == EAGAIN && blocking_socket(sock))
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errno = ETIMEDOUT;
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return (errno);
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}
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if (fdp == NULL)
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return (0);
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return (proto_descriptor_recv(sock, fdp));
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}
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