1 /*- 2 * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org> 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 PROJECT 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 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS 18 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 21 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 23 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 24 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 * $FreeBSD: stable/10/usr.sbin/rtadvd/control_client.c 225519 2011-09-12 23:52:55Z hrs $ 27 * 28 */ 29 30 #include <sys/queue.h> 31 #include <sys/types.h> 32 #include <sys/socket.h> 33 #include <sys/stat.h> 34 #include <sys/un.h> 35 #include <sys/uio.h> 36 #include <net/if.h> 37 #include <net/if_dl.h> 38 #include <netinet/in.h> 39 #include <netinet/icmp6.h> 40 #include <fcntl.h> 41 #include <errno.h> 42 #include <netdb.h> 43 #include <unistd.h> 44 #include <signal.h> 45 #include <string.h> 46 #include <stdarg.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <syslog.h> 50 51 #include "pathnames.h" 52 #include "rtadvd.h" 53 #include "if.h" 54 #include "control.h" 55 #include "control_client.h" 56 57 int 58 cm_handler_client(int fd, int state, char *buf_orig) 59 { 60 char buf[CM_MSG_MAXLEN]; 61 struct ctrl_msg_hdr *cm; 62 struct ctrl_msg_hdr *cm_orig; 63 int error; 64 char *msg; 65 char *msg_orig; 66 67 syslog(LOG_DEBUG, "<%s> enter", __func__); 68 69 memset(buf, 0, sizeof(buf)); 70 cm = (struct ctrl_msg_hdr *)buf; 71 cm_orig = (struct ctrl_msg_hdr *)buf_orig; 72 msg = (char *)buf + sizeof(*cm); 73 msg_orig = (char *)buf_orig + sizeof(*cm_orig); 74 75 if (cm_orig->cm_len > CM_MSG_MAXLEN) { 76 syslog(LOG_DEBUG, "<%s> msg too long", __func__); 77 close(fd); 78 return (-1); 79 } 80 cm->cm_type = cm_orig->cm_type; 81 if (cm_orig->cm_len > sizeof(*cm_orig)) { 82 memcpy(msg, msg_orig, cm_orig->cm_len - sizeof(*cm)); 83 cm->cm_len = cm_orig->cm_len; 84 } 85 while (state != CM_STATE_EOM) { 86 syslog(LOG_DEBUG, "<%s> state = %d", __func__, state); 87 88 switch (state) { 89 case CM_STATE_INIT: 90 state = CM_STATE_EOM; 91 break; 92 case CM_STATE_MSG_DISPATCH: 93 cm->cm_version = CM_VERSION; 94 error = cm_send(fd, buf); 95 if (error) 96 syslog(LOG_WARNING, 97 "<%s> cm_send()", __func__); 98 state = CM_STATE_ACK_WAIT; 99 break; 100 case CM_STATE_ACK_WAIT: 101 error = cm_recv(fd, buf); 102 if (error) { 103 syslog(LOG_ERR, 104 "<%s> cm_recv()", __func__); 105 close(fd); 106 return (-1); 107 } 108 switch (cm->cm_type) { 109 case CM_TYPE_ACK: 110 syslog(LOG_DEBUG, 111 "<%s> CM_TYPE_ACK", __func__); 112 break; 113 case CM_TYPE_ERR: 114 syslog(LOG_DEBUG, 115 "<%s> CM_TYPE_ERR", __func__); 116 close(fd); 117 return (-1); 118 default: 119 syslog(LOG_DEBUG, 120 "<%s> unknown status", __func__); 121 close(fd); 122 return (-1); 123 } 124 memcpy(buf_orig, buf, cm->cm_len); 125 state = CM_STATE_EOM; 126 break; 127 } 128 } 129 close(fd); 130 return (0); 131 } 132