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 #include <sys/types.h> 29 #include <sys/socket.h> 30 #include <sys/un.h> 31 #include <inttypes.h> 32 #include <errno.h> 33 #include <stdarg.h> 34 #include <stdbool.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 39 #include "uc_common.h" 40 #include "t_generic.h" 41 #include "t_cmsg_len.h" 42 43 #ifndef __LP64__ 44 static int 45 t_cmsg_len_client(int fd) 46 { 47 struct msghdr msghdr; 48 struct iovec iov[1]; 49 struct cmsghdr *cmsghdr; 50 void *cmsg_data; 51 size_t size, cmsg_size; 52 socklen_t socklen; 53 int rv; 54 55 if (uc_sync_recv() < 0) 56 return (-2); 57 58 rv = -2; 59 60 cmsg_size = CMSG_SPACE(sizeof(struct cmsgcred)); 61 cmsg_data = malloc(cmsg_size); 62 if (cmsg_data == NULL) { 63 uc_logmsg("malloc"); 64 goto done; 65 } 66 uc_msghdr_init_client(&msghdr, iov, cmsg_data, cmsg_size, 67 SCM_CREDS, sizeof(struct cmsgcred)); 68 cmsghdr = CMSG_FIRSTHDR(&msghdr); 69 70 if (uc_socket_connect(fd) < 0) 71 goto done; 72 73 size = msghdr.msg_iov != NULL ? msghdr.msg_iov->iov_len : 0; 74 rv = -1; 75 for (socklen = 0; socklen < CMSG_LEN(0); ++socklen) { 76 cmsghdr->cmsg_len = socklen; 77 uc_dbgmsg("send: data size %zu", size); 78 uc_dbgmsg("send: msghdr.msg_controllen %u", 79 (u_int)msghdr.msg_controllen); 80 uc_dbgmsg("send: cmsghdr.cmsg_len %u", 81 (u_int)cmsghdr->cmsg_len); 82 if (sendmsg(fd, &msghdr, 0) < 0) { 83 uc_dbgmsg("sendmsg(2) failed: %s; retrying", 84 strerror(errno)); 85 continue; 86 } 87 uc_logmsgx("sent message with cmsghdr.cmsg_len %u < %u", 88 (u_int)cmsghdr->cmsg_len, (u_int)CMSG_LEN(0)); 89 break; 90 } 91 if (socklen == CMSG_LEN(0)) 92 rv = 0; 93 94 if (uc_sync_send() < 0) { 95 rv = -2; 96 goto done; 97 } 98 done: 99 free(cmsg_data); 100 return (rv); 101 } 102 103 static int 104 t_cmsg_len_server(int fd1) 105 { 106 int fd2, rv; 107 108 if (uc_sync_send() < 0) 109 return (-2); 110 111 rv = -2; 112 113 if (uc_cfg.sock_type == SOCK_STREAM) { 114 fd2 = uc_socket_accept(fd1); 115 if (fd2 < 0) 116 goto done; 117 } else 118 fd2 = fd1; 119 120 if (uc_sync_recv() < 0) 121 goto done; 122 123 rv = 0; 124 done: 125 if (uc_cfg.sock_type == SOCK_STREAM && fd2 >= 0) 126 if (uc_socket_close(fd2) < 0) 127 rv = -2; 128 return (rv); 129 } 130 131 int 132 t_cmsg_len(void) 133 { 134 return (t_generic(t_cmsg_len_client, t_cmsg_len_server)); 135 } 136 #endif 137