1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 * 26 * INIT_REBOOT state of the DHCP client state machine. 27 */ 28 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #include <sys/types.h> 32 #include <stdio.h> 33 #include <limits.h> 34 #include <sys/socket.h> 35 #include <netinet/in.h> 36 #include <netinet/dhcp.h> 37 #include <netinet/udp.h> 38 #include <netinet/ip_var.h> 39 #include <netinet/udp_var.h> 40 #include <dhcpmsg.h> 41 #include <string.h> 42 43 #include "agent.h" 44 #include "packet.h" 45 #include "states.h" 46 #include "util.h" 47 #include "interface.h" 48 #include "defaults.h" 49 50 static stop_func_t stop_init_reboot; 51 52 /* 53 * dhcp_init_reboot(): attempts to reuse a cached configuration on an interface 54 * 55 * input: struct ifslist *: the interface to reuse the configuration on 56 * output: void 57 */ 58 59 void 60 dhcp_init_reboot(struct ifslist *ifsp) 61 { 62 dhcp_pkt_t *dpkt; 63 const char *reqhost; 64 char hostfile[PATH_MAX + 1]; 65 66 dhcpmsg(MSG_VERBOSE, "%s has cached configuration - entering " 67 "INIT_REBOOT", ifsp->if_name); 68 69 ifsp->if_state = INIT_REBOOT; 70 71 if (register_acknak(ifsp) == 0) { 72 73 ifsp->if_state = INIT; 74 ifsp->if_dflags |= DHCP_IF_FAILED; 75 ipc_action_finish(ifsp, DHCP_IPC_E_MEMORY); 76 async_finish(ifsp); 77 78 dhcpmsg(MSG_ERROR, "dhcp_init_reboot: cannot register to " 79 "collect ACK/NAK packets, reverting to INIT on %s", 80 ifsp->if_name); 81 return; 82 } 83 84 /* 85 * assemble DHCPREQUEST message. The max dhcp message size 86 * option is set to the interface max, minus the size of the udp and 87 * ip headers. 88 */ 89 90 dpkt = init_pkt(ifsp, REQUEST); 91 add_pkt_opt32(dpkt, CD_REQUESTED_IP_ADDR, 92 ifsp->if_ack->pkt->yiaddr.s_addr); 93 94 add_pkt_opt32(dpkt, CD_LEASE_TIME, htonl(DHCP_PERM)); 95 add_pkt_opt16(dpkt, CD_MAX_DHCP_SIZE, htons(ifsp->if_max - 96 sizeof (struct udpiphdr))); 97 98 add_pkt_opt(dpkt, CD_CLASS_ID, class_id, class_id_len); 99 add_pkt_opt(dpkt, CD_REQUEST_LIST, ifsp->if_prl, ifsp->if_prllen); 100 101 /* 102 * Set CD_HOSTNAME option if REQUEST_HOSTNAME is set and a hostname 103 * is found in /etc/hostname.<ifname> 104 */ 105 if (df_get_bool(ifsp->if_name, DF_REQUEST_HOSTNAME)) { 106 dhcpmsg(MSG_DEBUG, "dhcp_selecting: DF_REQUEST_HOSTNAME"); 107 (void) snprintf(hostfile, sizeof (hostfile), "/etc/hostname.%s", 108 ifsp->if_name); 109 110 if ((reqhost = iffile_to_hostname(hostfile)) != NULL) { 111 dhcpmsg(MSG_DEBUG, "dhcp_selecting: host %s", reqhost); 112 if ((ifsp->if_reqhost = strdup(reqhost)) != NULL) 113 add_pkt_opt(dpkt, CD_HOSTNAME, ifsp->if_reqhost, 114 strlen(ifsp->if_reqhost)); 115 else 116 dhcpmsg(MSG_WARNING, "dhcp_selecting: cannot" 117 " allocate memory for host name option"); 118 } 119 } 120 121 add_pkt_opt(dpkt, CD_END, NULL, 0); 122 123 (void) send_pkt(ifsp, dpkt, htonl(INADDR_BROADCAST), stop_init_reboot); 124 } 125 126 /* 127 * stop_init_reboot(): decides when to stop retransmitting REQUESTs 128 * 129 * input: struct ifslist *: the interface REQUESTs are being sent on 130 * unsigned int: the number of REQUESTs sent so far 131 * output: boolean_t: B_TRUE if retransmissions should stop 132 */ 133 134 static boolean_t 135 stop_init_reboot(struct ifslist *ifsp, unsigned int n_requests) 136 { 137 if (n_requests >= DHCP_MAX_REQUESTS) { 138 139 (void) unregister_acknak(ifsp); 140 141 dhcpmsg(MSG_INFO, "no ACK/NAK to INIT_REBOOT REQUEST, " 142 "using remainder of existing lease on %s", ifsp->if_name); 143 144 /* 145 * we already stuck our old ack in ifsp->if_ack and 146 * relativized the packet times, so we can just 147 * pretend that the server sent it to us and move to 148 * bound. if that fails, fall back to selecting. 149 */ 150 151 if (dhcp_bound(ifsp, NULL) == 0) 152 dhcp_selecting(ifsp); 153 154 return (B_TRUE); 155 } 156 157 return (B_FALSE); 158 } 159