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/types.h> 28 #include <sys/socket.h> 29 #include <sys/un.h> 30 #include <inttypes.h> 31 #include <errno.h> 32 #include <stdarg.h> 33 #include <stdbool.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 38 #include "uc_common.h" 39 #include "t_generic.h" 40 #include "t_cmsg_len.h" 41 42 #ifndef __LP64__ 43 static int 44 t_cmsg_len_client(int fd) 45 { 46 struct msghdr msghdr; 47 struct iovec iov[1]; 48 struct cmsghdr *cmsghdr; 49 void *cmsg_data; 50 size_t size, cmsg_size; 51 socklen_t socklen; 52 int rv; 53 54 if (uc_sync_recv() < 0) 55 return (-2); 56 57 rv = -2; 58 59 cmsg_size = CMSG_SPACE(sizeof(struct cmsgcred)); 60 cmsg_data = malloc(cmsg_size); 61 if (cmsg_data == NULL) { 62 uc_logmsg("malloc"); 63 goto done; 64 } 65 uc_msghdr_init_client(&msghdr, iov, cmsg_data, cmsg_size, 66 SCM_CREDS, sizeof(struct cmsgcred)); 67 cmsghdr = CMSG_FIRSTHDR(&msghdr); 68 69 if (uc_socket_connect(fd) < 0) 70 goto done; 71 72 size = msghdr.msg_iov != NULL ? msghdr.msg_iov->iov_len : 0; 73 rv = -1; 74 for (socklen = 0; socklen < CMSG_LEN(0); ++socklen) { 75 cmsghdr->cmsg_len = socklen; 76 uc_dbgmsg("send: data size %zu", size); 77 uc_dbgmsg("send: msghdr.msg_controllen %u", 78 (u_int)msghdr.msg_controllen); 79 uc_dbgmsg("send: cmsghdr.cmsg_len %u", 80 (u_int)cmsghdr->cmsg_len); 81 if (sendmsg(fd, &msghdr, 0) < 0) { 82 uc_dbgmsg("sendmsg(2) failed: %s; retrying", 83 strerror(errno)); 84 continue; 85 } 86 uc_logmsgx("sent message with cmsghdr.cmsg_len %u < %u", 87 (u_int)cmsghdr->cmsg_len, (u_int)CMSG_LEN(0)); 88 break; 89 } 90 if (socklen == CMSG_LEN(0)) 91 rv = 0; 92 93 if (uc_sync_send() < 0) { 94 rv = -2; 95 goto done; 96 } 97 done: 98 free(cmsg_data); 99 return (rv); 100 } 101 102 static int 103 t_cmsg_len_server(int fd1) 104 { 105 int fd2, rv; 106 107 if (uc_sync_send() < 0) 108 return (-2); 109 110 rv = -2; 111 112 if (uc_cfg.sock_type == SOCK_STREAM) { 113 fd2 = uc_socket_accept(fd1); 114 if (fd2 < 0) 115 goto done; 116 } else 117 fd2 = fd1; 118 119 if (uc_sync_recv() < 0) 120 goto done; 121 122 rv = 0; 123 done: 124 if (uc_cfg.sock_type == SOCK_STREAM && fd2 >= 0) 125 if (uc_socket_close(fd2) < 0) 126 rv = -2; 127 return (rv); 128 } 129 130 int 131 t_cmsg_len(void) 132 { 133 return (t_generic(t_cmsg_len_client, t_cmsg_len_server)); 134 } 135 #endif 136