xref: /freebsd/usr.sbin/rtadvd/control_client.c (revision b3e7694832e81d7a904a10f525f8797b753bf0d3)
137241896SHiroki Sato /*-
2*4d846d26SWarner Losh  * SPDX-License-Identifier: BSD-2-Clause
31de7b4b8SPedro F. Giffuni  *
437241896SHiroki Sato  * Copyright (C) 2011 Hiroki Sato <hrs@FreeBSD.org>
537241896SHiroki Sato  * All rights reserved.
637241896SHiroki Sato  *
737241896SHiroki Sato  * Redistribution and use in source and binary forms, with or without
837241896SHiroki Sato  * modification, are permitted provided that the following conditions
937241896SHiroki Sato  * are met:
1037241896SHiroki Sato  * 1. Redistributions of source code must retain the above copyright
1137241896SHiroki Sato  *    notice, this list of conditions and the following disclaimer.
1237241896SHiroki Sato  * 2. Redistributions in binary form must reproduce the above copyright
1337241896SHiroki Sato  *    notice, this list of conditions and the following disclaimer in the
1437241896SHiroki Sato  *    documentation and/or other materials provided with the distribution.
1537241896SHiroki Sato  *
1637241896SHiroki Sato  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
1737241896SHiroki Sato  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1837241896SHiroki Sato  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
1937241896SHiroki Sato  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS
2037241896SHiroki Sato  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
2137241896SHiroki Sato  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
2237241896SHiroki Sato  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
2337241896SHiroki Sato  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
2437241896SHiroki Sato  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
2537241896SHiroki Sato  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
2637241896SHiroki Sato  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
2737241896SHiroki Sato  *
2837241896SHiroki Sato  */
2937241896SHiroki Sato 
3037241896SHiroki Sato #include <sys/queue.h>
3137241896SHiroki Sato #include <sys/types.h>
3237241896SHiroki Sato #include <sys/socket.h>
3337241896SHiroki Sato #include <sys/stat.h>
3437241896SHiroki Sato #include <sys/un.h>
3537241896SHiroki Sato #include <sys/uio.h>
3637241896SHiroki Sato #include <net/if.h>
3737241896SHiroki Sato #include <net/if_dl.h>
3837241896SHiroki Sato #include <netinet/in.h>
3937241896SHiroki Sato #include <netinet/icmp6.h>
4037241896SHiroki Sato #include <fcntl.h>
4137241896SHiroki Sato #include <errno.h>
4237241896SHiroki Sato #include <netdb.h>
4337241896SHiroki Sato #include <unistd.h>
4437241896SHiroki Sato #include <signal.h>
4537241896SHiroki Sato #include <string.h>
4637241896SHiroki Sato #include <stdarg.h>
4737241896SHiroki Sato #include <stdio.h>
4837241896SHiroki Sato #include <stdlib.h>
4937241896SHiroki Sato #include <syslog.h>
5037241896SHiroki Sato 
5137241896SHiroki Sato #include "pathnames.h"
5237241896SHiroki Sato #include "rtadvd.h"
5337241896SHiroki Sato #include "if.h"
5437241896SHiroki Sato #include "control.h"
5537241896SHiroki Sato #include "control_client.h"
5637241896SHiroki Sato 
5737241896SHiroki Sato int
cm_handler_client(int fd,int state,char * buf_orig)58aed37872SHiroki Sato cm_handler_client(int fd, int state, char *buf_orig)
5937241896SHiroki Sato {
6037241896SHiroki Sato 	char buf[CM_MSG_MAXLEN];
6137241896SHiroki Sato 	struct ctrl_msg_hdr *cm;
6237241896SHiroki Sato 	struct ctrl_msg_hdr *cm_orig;
6337241896SHiroki Sato 	int error;
6437241896SHiroki Sato 	char *msg;
6537241896SHiroki Sato 	char *msg_orig;
6637241896SHiroki Sato 
6737241896SHiroki Sato 	syslog(LOG_DEBUG, "<%s> enter", __func__);
6837241896SHiroki Sato 
6937241896SHiroki Sato 	memset(buf, 0, sizeof(buf));
7037241896SHiroki Sato 	cm = (struct ctrl_msg_hdr *)buf;
7137241896SHiroki Sato 	cm_orig = (struct ctrl_msg_hdr *)buf_orig;
7237241896SHiroki Sato 	msg = (char *)buf + sizeof(*cm);
7337241896SHiroki Sato 	msg_orig = (char *)buf_orig + sizeof(*cm_orig);
7437241896SHiroki Sato 
7537241896SHiroki Sato 	if (cm_orig->cm_len > CM_MSG_MAXLEN) {
7637241896SHiroki Sato 		syslog(LOG_DEBUG, "<%s> msg too long", __func__);
7737241896SHiroki Sato 		close(fd);
7837241896SHiroki Sato 		return (-1);
7937241896SHiroki Sato 	}
8037241896SHiroki Sato 	cm->cm_type = cm_orig->cm_type;
8137241896SHiroki Sato 	if (cm_orig->cm_len > sizeof(*cm_orig)) {
8237241896SHiroki Sato 		memcpy(msg, msg_orig, cm_orig->cm_len - sizeof(*cm));
8337241896SHiroki Sato 		cm->cm_len = cm_orig->cm_len;
8437241896SHiroki Sato 	}
8537241896SHiroki Sato 	while (state != CM_STATE_EOM) {
8637241896SHiroki Sato 		syslog(LOG_DEBUG, "<%s> state = %d", __func__, state);
8737241896SHiroki Sato 
8837241896SHiroki Sato 		switch (state) {
8937241896SHiroki Sato 		case CM_STATE_INIT:
9037241896SHiroki Sato 			state = CM_STATE_EOM;
9137241896SHiroki Sato 			break;
9237241896SHiroki Sato 		case CM_STATE_MSG_DISPATCH:
9337241896SHiroki Sato 			cm->cm_version = CM_VERSION;
94aed37872SHiroki Sato 			error = cm_send(fd, buf);
95a09a9cbbSConrad Meyer 			if (error) {
9637241896SHiroki Sato 				syslog(LOG_WARNING,
97aed37872SHiroki Sato 				    "<%s> cm_send()", __func__);
98a09a9cbbSConrad Meyer 				return (-1);
99a09a9cbbSConrad Meyer 			}
10037241896SHiroki Sato 			state = CM_STATE_ACK_WAIT;
10137241896SHiroki Sato 			break;
10237241896SHiroki Sato 		case CM_STATE_ACK_WAIT:
103aed37872SHiroki Sato 			error = cm_recv(fd, buf);
10437241896SHiroki Sato 			if (error) {
10537241896SHiroki Sato 				syslog(LOG_ERR,
106aed37872SHiroki Sato 				    "<%s> cm_recv()", __func__);
10737241896SHiroki Sato 				close(fd);
10837241896SHiroki Sato 				return (-1);
10937241896SHiroki Sato 			}
11037241896SHiroki Sato 			switch (cm->cm_type) {
11137241896SHiroki Sato 			case CM_TYPE_ACK:
11237241896SHiroki Sato 				syslog(LOG_DEBUG,
11337241896SHiroki Sato 				    "<%s> CM_TYPE_ACK", __func__);
11437241896SHiroki Sato 				break;
11537241896SHiroki Sato 			case CM_TYPE_ERR:
11637241896SHiroki Sato 				syslog(LOG_DEBUG,
11737241896SHiroki Sato 				    "<%s> CM_TYPE_ERR", __func__);
11837241896SHiroki Sato 				close(fd);
11937241896SHiroki Sato 				return (-1);
12037241896SHiroki Sato 			default:
12137241896SHiroki Sato 				syslog(LOG_DEBUG,
12237241896SHiroki Sato 				    "<%s> unknown status", __func__);
12337241896SHiroki Sato 				close(fd);
12437241896SHiroki Sato 				return (-1);
12537241896SHiroki Sato 			}
12637241896SHiroki Sato 			memcpy(buf_orig, buf, cm->cm_len);
12737241896SHiroki Sato 			state = CM_STATE_EOM;
12837241896SHiroki Sato 			break;
12937241896SHiroki Sato 		}
13037241896SHiroki Sato 	}
13137241896SHiroki Sato 	close(fd);
13237241896SHiroki Sato 	return (0);
13337241896SHiroki Sato }
134