1 /*- 2 * Copyright (c) 2009-2010 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Pawel Jakub Dawidek under sponsorship from 6 * the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/types.h> 34 #include <sys/socket.h> 35 36 #include <errno.h> 37 #include <stdlib.h> 38 #include <strings.h> 39 40 #include "pjdlog.h" 41 #include "proto_impl.h" 42 43 /* Maximum size of packet we want to use when sending data. */ 44 #ifndef MAX_SEND_SIZE 45 #define MAX_SEND_SIZE 32768 46 #endif 47 48 int 49 proto_common_send(int sock, const unsigned char *data, size_t size) 50 { 51 ssize_t done; 52 size_t sendsize; 53 54 PJDLOG_ASSERT(sock >= 0); 55 PJDLOG_ASSERT(data != NULL); 56 PJDLOG_ASSERT(size > 0); 57 58 do { 59 sendsize = size < MAX_SEND_SIZE ? size : MAX_SEND_SIZE; 60 done = send(sock, data, sendsize, MSG_NOSIGNAL); 61 if (done == 0) 62 return (ENOTCONN); 63 else if (done < 0) { 64 if (errno == EINTR) 65 continue; 66 return (errno); 67 } 68 data += done; 69 size -= done; 70 } while (size > 0); 71 72 return (0); 73 } 74 75 int 76 proto_common_recv(int sock, unsigned char *data, size_t size) 77 { 78 ssize_t done; 79 80 PJDLOG_ASSERT(sock >= 0); 81 PJDLOG_ASSERT(data != NULL); 82 PJDLOG_ASSERT(size > 0); 83 84 do { 85 done = recv(sock, data, size, MSG_WAITALL); 86 } while (done == -1 && errno == EINTR); 87 if (done == 0) 88 return (ENOTCONN); 89 else if (done < 0) 90 return (errno); 91 return (0); 92 } 93 94 int 95 proto_common_descriptor_send(int sock, int fd) 96 { 97 unsigned char ctrl[CMSG_SPACE(sizeof(fd))]; 98 struct msghdr msg; 99 struct cmsghdr *cmsg; 100 101 PJDLOG_ASSERT(sock >= 0); 102 PJDLOG_ASSERT(fd >= 0); 103 104 bzero(&msg, sizeof(msg)); 105 bzero(&ctrl, sizeof(ctrl)); 106 107 msg.msg_iov = NULL; 108 msg.msg_iovlen = 0; 109 msg.msg_control = ctrl; 110 msg.msg_controllen = sizeof(ctrl); 111 112 cmsg = CMSG_FIRSTHDR(&msg); 113 cmsg->cmsg_level = SOL_SOCKET; 114 cmsg->cmsg_type = SCM_RIGHTS; 115 cmsg->cmsg_len = CMSG_LEN(sizeof(fd)); 116 *((int *)CMSG_DATA(cmsg)) = fd; 117 118 if (sendmsg(sock, &msg, 0) == -1) 119 return (errno); 120 121 return (0); 122 } 123 124 int 125 proto_common_descriptor_recv(int sock, int *fdp) 126 { 127 unsigned char ctrl[CMSG_SPACE(sizeof(*fdp))]; 128 struct msghdr msg; 129 struct cmsghdr *cmsg; 130 131 PJDLOG_ASSERT(sock >= 0); 132 PJDLOG_ASSERT(fdp != NULL); 133 134 bzero(&msg, sizeof(msg)); 135 bzero(&ctrl, sizeof(ctrl)); 136 137 msg.msg_iov = NULL; 138 msg.msg_iovlen = 0; 139 msg.msg_control = ctrl; 140 msg.msg_controllen = sizeof(ctrl); 141 142 if (recvmsg(sock, &msg, 0) == -1) 143 return (errno); 144 145 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg != NULL; 146 cmsg = CMSG_NXTHDR(&msg, cmsg)) { 147 if (cmsg->cmsg_level == SOL_SOCKET && 148 cmsg->cmsg_type == SCM_RIGHTS) { 149 *fdp = *((int *)CMSG_DATA(cmsg)); 150 return (0); 151 } 152 } 153 154 return (ENOENT); 155 } 156