1204076Spjd/*- 2204076Spjd * Copyright (c) 2009-2010 The FreeBSD Foundation 3220272Spjd * Copyright (c) 2011 Pawel Jakub Dawidek <pawel@dawidek.net> 4204076Spjd * All rights reserved. 5204076Spjd * 6204076Spjd * This software was developed by Pawel Jakub Dawidek under sponsorship from 7204076Spjd * the FreeBSD Foundation. 8204076Spjd * 9204076Spjd * Redistribution and use in source and binary forms, with or without 10204076Spjd * modification, are permitted provided that the following conditions 11204076Spjd * are met: 12204076Spjd * 1. Redistributions of source code must retain the above copyright 13204076Spjd * notice, this list of conditions and the following disclaimer. 14204076Spjd * 2. Redistributions in binary form must reproduce the above copyright 15204076Spjd * notice, this list of conditions and the following disclaimer in the 16204076Spjd * documentation and/or other materials provided with the distribution. 17204076Spjd * 18204076Spjd * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 19204076Spjd * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20204076Spjd * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21204076Spjd * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 22204076Spjd * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23204076Spjd * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24204076Spjd * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25204076Spjd * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26204076Spjd * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27204076Spjd * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28204076Spjd * SUCH DAMAGE. 29204076Spjd */ 30204076Spjd 31204076Spjd#include <sys/cdefs.h> 32204076Spjd__FBSDID("$FreeBSD$"); 33204076Spjd 34204076Spjd#include <sys/types.h> 35204076Spjd#include <sys/socket.h> 36204076Spjd 37204076Spjd#include <errno.h> 38220272Spjd#include <fcntl.h> 39220272Spjd#include <stdbool.h> 40204076Spjd#include <stdlib.h> 41204076Spjd#include <strings.h> 42220272Spjd#include <unistd.h> 43204076Spjd 44218138Spjd#include "pjdlog.h" 45204076Spjd#include "proto_impl.h" 46204076Spjd 47204076Spjd/* Maximum size of packet we want to use when sending data. */ 48204076Spjd#ifndef MAX_SEND_SIZE 49211452Spjd#define MAX_SEND_SIZE 32768 50204076Spjd#endif 51204076Spjd 52220272Spjdstatic bool 53220272Spjdblocking_socket(int sock) 54220272Spjd{ 55220272Spjd int flags; 56220272Spjd 57220272Spjd flags = fcntl(sock, F_GETFL); 58220272Spjd PJDLOG_ASSERT(flags >= 0); 59220272Spjd return ((flags & O_NONBLOCK) == 0); 60220272Spjd} 61220272Spjd 62218194Spjdstatic int 63218194Spjdproto_descriptor_send(int sock, int fd) 64204076Spjd{ 65218139Spjd unsigned char ctrl[CMSG_SPACE(sizeof(fd))]; 66218139Spjd struct msghdr msg; 67218139Spjd struct cmsghdr *cmsg; 68218139Spjd 69218139Spjd PJDLOG_ASSERT(sock >= 0); 70218139Spjd PJDLOG_ASSERT(fd >= 0); 71218139Spjd 72218139Spjd bzero(&msg, sizeof(msg)); 73218139Spjd bzero(&ctrl, sizeof(ctrl)); 74218139Spjd 75218139Spjd msg.msg_iov = NULL; 76218139Spjd msg.msg_iovlen = 0; 77218139Spjd msg.msg_control = ctrl; 78218139Spjd msg.msg_controllen = sizeof(ctrl); 79218139Spjd 80218139Spjd cmsg = CMSG_FIRSTHDR(&msg); 81218139Spjd cmsg->cmsg_level = SOL_SOCKET; 82218139Spjd cmsg->cmsg_type = SCM_RIGHTS; 83218139Spjd cmsg->cmsg_len = CMSG_LEN(sizeof(fd)); 84218148Spjd bcopy(&fd, CMSG_DATA(cmsg), sizeof(fd)); 85218139Spjd 86218139Spjd if (sendmsg(sock, &msg, 0) == -1) 87218139Spjd return (errno); 88218139Spjd 89218139Spjd return (0); 90218139Spjd} 91218139Spjd 92218139Spjdint 93218194Spjdproto_common_send(int sock, const unsigned char *data, size_t size, int fd) 94218139Spjd{ 95218194Spjd ssize_t done; 96218194Spjd size_t sendsize; 97220273Spjd int errcount = 0; 98218194Spjd 99218194Spjd PJDLOG_ASSERT(sock >= 0); 100220270Spjd 101220270Spjd if (data == NULL) { 102220270Spjd /* The caller is just trying to decide about direction. */ 103220270Spjd 104220270Spjd PJDLOG_ASSERT(size == 0); 105220270Spjd 106220270Spjd if (shutdown(sock, SHUT_RD) == -1) 107220270Spjd return (errno); 108220270Spjd return (0); 109220270Spjd } 110220270Spjd 111218194Spjd PJDLOG_ASSERT(data != NULL); 112218194Spjd PJDLOG_ASSERT(size > 0); 113218194Spjd 114218194Spjd do { 115218194Spjd sendsize = size < MAX_SEND_SIZE ? size : MAX_SEND_SIZE; 116218194Spjd done = send(sock, data, sendsize, MSG_NOSIGNAL); 117220272Spjd if (done == 0) { 118218194Spjd return (ENOTCONN); 119231017Strociny } else if (done == -1) { 120218194Spjd if (errno == EINTR) 121218194Spjd continue; 122220273Spjd if (errno == ENOBUFS) { 123220273Spjd /* 124220273Spjd * If there are no buffers we retry. 125220273Spjd * After each try we increase delay before the 126220273Spjd * next one and we give up after fifteen times. 127220273Spjd * This gives 11s of total wait time. 128220273Spjd */ 129220273Spjd if (errcount == 15) { 130220273Spjd pjdlog_warning("Getting ENOBUFS errors for 11s on send(), giving up."); 131220273Spjd } else { 132220273Spjd if (errcount == 0) 133220273Spjd pjdlog_warning("Got ENOBUFS error on send(), retrying for a bit."); 134220273Spjd errcount++; 135220273Spjd usleep(100000 * errcount); 136220273Spjd continue; 137220273Spjd } 138220273Spjd } 139220272Spjd /* 140220272Spjd * If this is blocking socket and we got EAGAIN, this 141220272Spjd * means the request timed out. Translate errno to 142220272Spjd * ETIMEDOUT, to give administrator a hint to 143220272Spjd * eventually increase timeout. 144220272Spjd */ 145220272Spjd if (errno == EAGAIN && blocking_socket(sock)) 146220272Spjd errno = ETIMEDOUT; 147218194Spjd return (errno); 148218194Spjd } 149218194Spjd data += done; 150218194Spjd size -= done; 151218194Spjd } while (size > 0); 152220273Spjd if (errcount > 0) { 153220273Spjd pjdlog_info("Data sent successfully after %d ENOBUFS error%s.", 154220273Spjd errcount, errcount == 1 ? "" : "s"); 155220273Spjd } 156218194Spjd 157218194Spjd if (fd == -1) 158218194Spjd return (0); 159218194Spjd return (proto_descriptor_send(sock, fd)); 160218194Spjd} 161218194Spjd 162218194Spjdstatic int 163218194Spjdproto_descriptor_recv(int sock, int *fdp) 164218194Spjd{ 165218139Spjd unsigned char ctrl[CMSG_SPACE(sizeof(*fdp))]; 166218139Spjd struct msghdr msg; 167218139Spjd struct cmsghdr *cmsg; 168218139Spjd 169218139Spjd PJDLOG_ASSERT(sock >= 0); 170218139Spjd PJDLOG_ASSERT(fdp != NULL); 171218139Spjd 172218139Spjd bzero(&msg, sizeof(msg)); 173218139Spjd bzero(&ctrl, sizeof(ctrl)); 174218139Spjd 175218139Spjd msg.msg_iov = NULL; 176218139Spjd msg.msg_iovlen = 0; 177218139Spjd msg.msg_control = ctrl; 178218139Spjd msg.msg_controllen = sizeof(ctrl); 179218139Spjd 180218139Spjd if (recvmsg(sock, &msg, 0) == -1) 181218139Spjd return (errno); 182218139Spjd 183218148Spjd cmsg = CMSG_FIRSTHDR(&msg); 184240269Strociny if (cmsg == NULL || cmsg->cmsg_level != SOL_SOCKET || 185218194Spjd cmsg->cmsg_type != SCM_RIGHTS) { 186218148Spjd return (EINVAL); 187218139Spjd } 188218148Spjd bcopy(CMSG_DATA(cmsg), fdp, sizeof(*fdp)); 189218139Spjd 190218148Spjd return (0); 191218139Spjd} 192218194Spjd 193218194Spjdint 194218194Spjdproto_common_recv(int sock, unsigned char *data, size_t size, int *fdp) 195218194Spjd{ 196218194Spjd ssize_t done; 197218194Spjd 198218194Spjd PJDLOG_ASSERT(sock >= 0); 199220270Spjd 200220270Spjd if (data == NULL) { 201220270Spjd /* The caller is just trying to decide about direction. */ 202220270Spjd 203220270Spjd PJDLOG_ASSERT(size == 0); 204220270Spjd 205220270Spjd if (shutdown(sock, SHUT_WR) == -1) 206220270Spjd return (errno); 207220270Spjd return (0); 208220270Spjd } 209220270Spjd 210218194Spjd PJDLOG_ASSERT(data != NULL); 211218194Spjd PJDLOG_ASSERT(size > 0); 212218194Spjd 213218194Spjd do { 214223143Ssobomax done = recv(sock, data, size, MSG_WAITALL); 215223143Ssobomax } while (done == -1 && errno == EINTR); 216220272Spjd if (done == 0) { 217218194Spjd return (ENOTCONN); 218231017Strociny } else if (done == -1) { 219220272Spjd /* 220220272Spjd * If this is blocking socket and we got EAGAIN, this 221220272Spjd * means the request timed out. Translate errno to 222220272Spjd * ETIMEDOUT, to give administrator a hint to 223220272Spjd * eventually increase timeout. 224220272Spjd */ 225220272Spjd if (errno == EAGAIN && blocking_socket(sock)) 226220272Spjd errno = ETIMEDOUT; 227218194Spjd return (errno); 228220272Spjd } 229218194Spjd if (fdp == NULL) 230218194Spjd return (0); 231218194Spjd return (proto_descriptor_recv(sock, fdp)); 232218194Spjd} 233