diff options
Diffstat (limited to 'usr/src/cmd/cmd-inet/sbin/dhcpagent/release.c')
| -rw-r--r-- | usr/src/cmd/cmd-inet/sbin/dhcpagent/release.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/usr/src/cmd/cmd-inet/sbin/dhcpagent/release.c b/usr/src/cmd/cmd-inet/sbin/dhcpagent/release.c new file mode 100644 index 0000000000..3d217c77b8 --- /dev/null +++ b/usr/src/cmd/cmd-inet/sbin/dhcpagent/release.c @@ -0,0 +1,160 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License, Version 1.0 only + * (the "License"). You may not use this file except in compliance + * with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright 2004 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + * + * DECLINE/RELEASE configuration functionality for the DHCP client. + */ + +#pragma ident "%Z%%M% %I% %E% SMI" + +#include <sys/types.h> +#include <string.h> +#include <netinet/in.h> +#include <sys/socket.h> +#include <net/if.h> +#include <netinet/dhcp.h> +#include <dhcpmsg.h> +#include <dhcp_hostconf.h> +#include <unistd.h> + +#include "packet.h" +#include "interface.h" +#include "states.h" + +/* + * send_decline(): sends a DECLINE message (broadcasted) + * + * input: struct ifslist *: the interface to send the DECLINE on + * char *: an optional text explanation to send with the message + * struct in_addr *: the IP address being declined + * output: void + */ + +void +send_decline(struct ifslist *ifsp, char *msg, struct in_addr *declined_ip) +{ + dhcp_pkt_t *dpkt; + + dpkt = init_pkt(ifsp, DECLINE); + add_pkt_opt32(dpkt, CD_SERVER_ID, ifsp->if_server.s_addr); + + if (msg != NULL) + add_pkt_opt(dpkt, CD_MESSAGE, msg, strlen(msg) + 1); + + add_pkt_opt32(dpkt, CD_REQUESTED_IP_ADDR, declined_ip->s_addr); + add_pkt_opt(dpkt, CD_END, NULL, 0); + + (void) send_pkt(ifsp, dpkt, htonl(INADDR_BROADCAST), NULL); +} + +/* + * dhcp_release(): sends a RELEASE message to a DHCP server and removes + * the interface from DHCP control + * + * input: struct ifslist *: the interface to send the RELEASE on and remove + * const char *: an optional text explanation to send with the message + * output: int: 1 on success, 0 on failure + */ + +int +dhcp_release(struct ifslist *ifsp, const char *msg) +{ + int retval = 0; + int error = DHCP_IPC_E_INT; + dhcp_pkt_t *dpkt; + + if (ifsp->if_dflags & DHCP_IF_BOOTP) + goto out; + + if (ifsp->if_state != BOUND && ifsp->if_state != RENEWING && + ifsp->if_state != REBINDING) + goto out; + + dhcpmsg(MSG_INFO, "releasing interface %s", ifsp->if_name); + + dpkt = init_pkt(ifsp, RELEASE); + dpkt->pkt->ciaddr.s_addr = ifsp->if_addr.s_addr; + + if (msg != NULL) + add_pkt_opt(dpkt, CD_MESSAGE, msg, strlen(msg) + 1); + + add_pkt_opt32(dpkt, CD_SERVER_ID, ifsp->if_server.s_addr); + add_pkt_opt(dpkt, CD_END, NULL, 0); + + (void) send_pkt(ifsp, dpkt, ifsp->if_server.s_addr, NULL); + + /* + * XXX this totally sucks, but since udp is best-effort, + * without this delay, there's a good chance that the packet + * that we just enqueued for sending will get pitched + * when we canonize the interface below. + */ + + (void) usleep(500); + (void) canonize_ifs(ifsp); + + remove_ifs(ifsp); + error = DHCP_IPC_SUCCESS; + retval = 1; +out: + ipc_action_finish(ifsp, error); + async_finish(ifsp); + return (retval); +} + +/* + * dhcp_drop(): drops the interface from DHCP control + * + * input: struct ifslist *: the interface to drop + * const char *: unused + * output: int: always 1 + */ + +/* ARGSUSED */ +int +dhcp_drop(struct ifslist *ifsp, const char *msg) +{ + PKT_LIST *plp[2]; + + dhcpmsg(MSG_INFO, "dropping interface %s", ifsp->if_name); + + if (ifsp->if_state == BOUND || ifsp->if_state == RENEWING || + ifsp->if_state == REBINDING) { + + if ((ifsp->if_dflags & DHCP_IF_BOOTP) == 0) { + plp[0] = ifsp->if_ack; + plp[1] = ifsp->if_orig_ack; + if (write_hostconf(ifsp->if_name, plp, 2, + monosec_to_time(ifsp->if_curstart_monosec)) == -1) + dhcpmsg(MSG_ERR, "cannot write %s (reboot will " + "not use cached configuration)", + ifname_to_hostconf(ifsp->if_name)); + } + (void) canonize_ifs(ifsp); + } + remove_ifs(ifsp); + ipc_action_finish(ifsp, DHCP_IPC_SUCCESS); + async_finish(ifsp); + return (1); +} |