1 /*- 2 * Copyright (c) 2005 Andrey Simonenko 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/types.h> 31 #include <sys/socket.h> 32 #include <sys/un.h> 33 #include <inttypes.h> 34 #include <errno.h> 35 #include <stdarg.h> 36 #include <stdbool.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <string.h> 40 41 #include "uc_common.h" 42 #include "t_generic.h" 43 #include "t_cmsg_len.h" 44 45 #ifndef __LP64__ 46 static int 47 t_cmsg_len_client(int fd) 48 { 49 struct msghdr msghdr; 50 struct iovec iov[1]; 51 struct cmsghdr *cmsghdr; 52 void *cmsg_data; 53 size_t size, cmsg_size; 54 socklen_t socklen; 55 int rv; 56 57 if (uc_sync_recv() < 0) 58 return (-2); 59 60 rv = -2; 61 62 cmsg_size = CMSG_SPACE(sizeof(struct cmsgcred)); 63 cmsg_data = malloc(cmsg_size); 64 if (cmsg_data == NULL) { 65 uc_logmsg("malloc"); 66 goto done; 67 } 68 uc_msghdr_init_client(&msghdr, iov, cmsg_data, cmsg_size, 69 SCM_CREDS, sizeof(struct cmsgcred)); 70 cmsghdr = CMSG_FIRSTHDR(&msghdr); 71 72 if (uc_socket_connect(fd) < 0) 73 goto done; 74 75 size = msghdr.msg_iov != NULL ? msghdr.msg_iov->iov_len : 0; 76 rv = -1; 77 for (socklen = 0; socklen < CMSG_LEN(0); ++socklen) { 78 cmsghdr->cmsg_len = socklen; 79 uc_dbgmsg("send: data size %zu", size); 80 uc_dbgmsg("send: msghdr.msg_controllen %u", 81 (u_int)msghdr.msg_controllen); 82 uc_dbgmsg("send: cmsghdr.cmsg_len %u", 83 (u_int)cmsghdr->cmsg_len); 84 if (sendmsg(fd, &msghdr, 0) < 0) { 85 uc_dbgmsg("sendmsg(2) failed: %s; retrying", 86 strerror(errno)); 87 continue; 88 } 89 uc_logmsgx("sent message with cmsghdr.cmsg_len %u < %u", 90 (u_int)cmsghdr->cmsg_len, (u_int)CMSG_LEN(0)); 91 break; 92 } 93 if (socklen == CMSG_LEN(0)) 94 rv = 0; 95 96 if (uc_sync_send() < 0) { 97 rv = -2; 98 goto done; 99 } 100 done: 101 free(cmsg_data); 102 return (rv); 103 } 104 105 static int 106 t_cmsg_len_server(int fd1) 107 { 108 int fd2, rv; 109 110 if (uc_sync_send() < 0) 111 return (-2); 112 113 rv = -2; 114 115 if (uc_cfg.sock_type == SOCK_STREAM) { 116 fd2 = uc_socket_accept(fd1); 117 if (fd2 < 0) 118 goto done; 119 } else 120 fd2 = fd1; 121 122 if (uc_sync_recv() < 0) 123 goto done; 124 125 rv = 0; 126 done: 127 if (uc_cfg.sock_type == SOCK_STREAM && fd2 >= 0) 128 if (uc_socket_close(fd2) < 0) 129 rv = -2; 130 return (rv); 131 } 132 133 int 134 t_cmsg_len(void) 135 { 136 return (t_generic(t_cmsg_len_client, t_cmsg_len_server)); 137 } 138 #endif 139