1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 23 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 * 30 */ 31 32 #include <sys/queue.h> 33 #include <sys/types.h> 34 #include <sys/socket.h> 35 #include <sys/stat.h> 36 #include <sys/un.h> 37 #include <sys/uio.h> 38 #include <net/if.h> 39 #include <net/if_dl.h> 40 #include <netinet/in.h> 41 #include <netinet/icmp6.h> 42 #include <fcntl.h> 43 #include <errno.h> 44 #include <netdb.h> 45 #include <unistd.h> 46 #include <signal.h> 47 #include <string.h> 48 #include <stdarg.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <syslog.h> 52 53 #include "pathnames.h" 54 #include "rtadvd.h" 55 #include "if.h" 56 #include "control.h" 57 #include "control_client.h" 58 59 int 60 cm_handler_client(int fd, int state, char *buf_orig) 61 { 62 char buf[CM_MSG_MAXLEN]; 63 struct ctrl_msg_hdr *cm; 64 struct ctrl_msg_hdr *cm_orig; 65 int error; 66 char *msg; 67 char *msg_orig; 68 69 syslog(LOG_DEBUG, "<%s> enter", __func__); 70 71 memset(buf, 0, sizeof(buf)); 72 cm = (struct ctrl_msg_hdr *)buf; 73 cm_orig = (struct ctrl_msg_hdr *)buf_orig; 74 msg = (char *)buf + sizeof(*cm); 75 msg_orig = (char *)buf_orig + sizeof(*cm_orig); 76 77 if (cm_orig->cm_len > CM_MSG_MAXLEN) { 78 syslog(LOG_DEBUG, "<%s> msg too long", __func__); 79 close(fd); 80 return (-1); 81 } 82 cm->cm_type = cm_orig->cm_type; 83 if (cm_orig->cm_len > sizeof(*cm_orig)) { 84 memcpy(msg, msg_orig, cm_orig->cm_len - sizeof(*cm)); 85 cm->cm_len = cm_orig->cm_len; 86 } 87 while (state != CM_STATE_EOM) { 88 syslog(LOG_DEBUG, "<%s> state = %d", __func__, state); 89 90 switch (state) { 91 case CM_STATE_INIT: 92 state = CM_STATE_EOM; 93 break; 94 case CM_STATE_MSG_DISPATCH: 95 cm->cm_version = CM_VERSION; 96 error = cm_send(fd, buf); 97 if (error) { 98 syslog(LOG_WARNING, 99 "<%s> cm_send()", __func__); 100 return (-1); 101 } 102 state = CM_STATE_ACK_WAIT; 103 break; 104 case CM_STATE_ACK_WAIT: 105 error = cm_recv(fd, buf); 106 if (error) { 107 syslog(LOG_ERR, 108 "<%s> cm_recv()", __func__); 109 close(fd); 110 return (-1); 111 } 112 switch (cm->cm_type) { 113 case CM_TYPE_ACK: 114 syslog(LOG_DEBUG, 115 "<%s> CM_TYPE_ACK", __func__); 116 break; 117 case CM_TYPE_ERR: 118 syslog(LOG_DEBUG, 119 "<%s> CM_TYPE_ERR", __func__); 120 close(fd); 121 return (-1); 122 default: 123 syslog(LOG_DEBUG, 124 "<%s> unknown status", __func__); 125 close(fd); 126 return (-1); 127 } 128 memcpy(buf_orig, buf, cm->cm_len); 129 state = CM_STATE_EOM; 130 break; 131 } 132 } 133 close(fd); 134 return (0); 135 } 136