Changeset 1770 in MondoRescue for branches/stable/mindi-busybox/networking/udhcp/dhcpd.c
- Timestamp:
- Nov 6, 2007, 11:01:53 AM (16 years ago)
- File:
-
- 1 edited
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branches/stable/mindi-busybox/networking/udhcp/dhcpd.c
r821 r1770 1 /* vi: set sw=4 ts=4: */ 1 2 /* dhcpd.c 2 3 * … … 10 11 */ 11 12 12 #include <fcntl.h> 13 #include <string.h> 14 #include <stdlib.h> 15 #include <sys/wait.h> 16 #include <arpa/inet.h> 17 #include <netdb.h> 18 #include <netinet/in.h> 19 #include <sys/socket.h> 20 #include <unistd.h> 21 #include <signal.h> 22 #include <errno.h> 23 #include <sys/ioctl.h> 24 #include <time.h> 25 13 #include <syslog.h> 14 #include "common.h" 26 15 #include "dhcpd.h" 27 #include "arpping.h"28 #include "socket.h"29 16 #include "options.h" 30 #include "files.h"31 #include "serverpacket.h"32 #include "common.h"33 #include "signalpipe.h"34 #include "static_leases.h"35 17 36 18 … … 40 22 41 23 42 int udhcpd_main(int argc, char *argv[]) 24 int udhcpd_main(int argc, char **argv); 25 int udhcpd_main(int argc, char **argv) 43 26 { 44 27 fd_set rfds; … … 48 31 uint8_t *state, *server_id, *requested; 49 32 uint32_t server_id_align, requested_align, static_lease_ip; 50 unsigned long timeout_end, num_ips; 33 unsigned timeout_end; 34 unsigned num_ips; 35 unsigned opt; 51 36 struct option_set *option; 52 37 struct dhcpOfferedAddr *lease, static_lease; 53 38 54 read_config(argc < 2 ? DHCPD_CONF_FILE : argv[1]); 55 56 /* Start the log, sanitize fd's, and write a pid file */ 57 udhcp_start_log_and_pid("udhcpd", server_config.pidfile); 58 59 if ((option = find_option(server_config.options, DHCP_LEASE_TIME))) { 39 opt = getopt32(argv, "fS"); 40 argv += optind; 41 42 if (!(opt & 1)) { /* no -f */ 43 bb_daemonize_or_rexec(0, argv); 44 logmode &= ~LOGMODE_STDIO; 45 } 46 47 if (opt & 2) { /* -S */ 48 openlog(applet_name, LOG_PID, LOG_LOCAL0); 49 logmode |= LOGMODE_SYSLOG; 50 } 51 52 /* Would rather not do read_config before daemonization - 53 * otherwise NOMMU machines will parse config twice */ 54 read_config(argv[0] ? argv[0] : DHCPD_CONF_FILE); 55 56 /* Make sure fd 0,1,2 are open */ 57 bb_sanitize_stdio(); 58 /* Equivalent of doing a fflush after every \n */ 59 setlinebuf(stdout); 60 61 /* Create pidfile */ 62 write_pidfile(server_config.pidfile); 63 /* if (!..) bb_perror_msg("cannot create pidfile %s", pidfile); */ 64 65 bb_info_msg("%s (v%s) started", applet_name, BB_VER); 66 67 option = find_option(server_config.options, DHCP_LEASE_TIME); 68 server_config.lease = LEASE_TIME; 69 if (option) { 60 70 memcpy(&server_config.lease, option->data + 2, 4); 61 71 server_config.lease = ntohl(server_config.lease); 62 72 } 63 else server_config.lease = LEASE_TIME;64 73 65 74 /* Sanity check */ 66 num_ips = ntohl(server_config.end) - ntohl(server_config.start)+ 1;75 num_ips = server_config.end_ip - server_config.start_ip + 1; 67 76 if (server_config.max_leases > num_ips) { 68 LOG(LOG_ERR, "max_leases value (%lu) not sane, " 69 "setting to %lu instead", 70 server_config.max_leases, num_ips); 77 bb_error_msg("max_leases=%u is too big, setting to %u", 78 (unsigned)server_config.max_leases, num_ips); 71 79 server_config.max_leases = num_ips; 72 80 } 73 81 74 leases = xzalloc(server_config.max_leases * sizeof( struct dhcpOfferedAddr));82 leases = xzalloc(server_config.max_leases * sizeof(*leases)); 75 83 read_leases(server_config.lease_file); 76 84 77 85 if (read_interface(server_config.interface, &server_config.ifindex, 78 &server_config.server, server_config.arp) < 0) 79 return 1; 80 81 if (!ENABLE_FEATURE_UDHCP_DEBUG) 82 udhcp_background(server_config.pidfile); /* hold lock during fork. */ 86 &server_config.server, server_config.arp)) { 87 retval = 1; 88 goto ret; 89 } 83 90 84 91 /* Setup the signal pipe */ 85 92 udhcp_sp_setup(); 86 93 87 timeout_end = time(0) + server_config.auto_time; 88 while(1) { /* loop until universe collapses */ 89 90 if (server_socket < 0) 91 if ((server_socket = listen_socket(INADDR_ANY, SERVER_PORT, server_config.interface)) < 0) { 92 LOG(LOG_ERR, "FATAL: couldn't create server socket, %m"); 93 return 2; 94 } 94 timeout_end = monotonic_sec() + server_config.auto_time; 95 while (1) { /* loop until universe collapses */ 96 97 if (server_socket < 0) { 98 server_socket = listen_socket(/*INADDR_ANY,*/ SERVER_PORT, 99 server_config.interface); 100 } 95 101 96 102 max_sock = udhcp_sp_fd_set(&rfds, server_socket); 97 103 if (server_config.auto_time) { 98 tv.tv_sec = timeout_end - time(0);104 tv.tv_sec = timeout_end - monotonic_sec(); 99 105 tv.tv_usec = 0; 100 106 } 107 retval = 0; 101 108 if (!server_config.auto_time || tv.tv_sec > 0) { 102 109 retval = select(max_sock + 1, &rfds, NULL, NULL, 103 110 server_config.auto_time ? &tv : NULL); 104 } else retval = 0; /* If we already timed out, fall through */ 105 111 } 106 112 if (retval == 0) { 107 113 write_leases(); 108 timeout_end = time(0) + server_config.auto_time; 109 continue; 110 } else if (retval < 0 && errno != EINTR) { 111 DEBUG(LOG_INFO, "error on select"); 114 timeout_end = monotonic_sec() + server_config.auto_time; 115 continue; 116 } 117 if (retval < 0 && errno != EINTR) { 118 DEBUG("error on select"); 112 119 continue; 113 120 } … … 115 122 switch (udhcp_sp_read(&rfds)) { 116 123 case SIGUSR1: 117 LOG(LOG_INFO,"Received a SIGUSR1");124 bb_info_msg("Received a SIGUSR1"); 118 125 write_leases(); 119 126 /* why not just reset the timeout, eh */ 120 timeout_end = time(0) + server_config.auto_time;127 timeout_end = monotonic_sec() + server_config.auto_time; 121 128 continue; 122 129 case SIGTERM: 123 LOG(LOG_INFO,"Received a SIGTERM");124 return0;130 bb_info_msg("Received a SIGTERM"); 131 goto ret0; 125 132 case 0: break; /* no signal */ 126 133 default: continue; /* signal or error (probably EINTR) */ 127 134 } 128 135 129 if ((bytes = udhcp_get_packet(&packet, server_socket)) < 0) { /* this waits for a packet - idle */ 136 bytes = udhcp_get_packet(&packet, server_socket); /* this waits for a packet - idle */ 137 if (bytes < 0) { 130 138 if (bytes == -1 && errno != EINTR) { 131 DEBUG( LOG_INFO, "error on read, %m, reopening socket");139 DEBUG("error on read, %s, reopening socket", strerror(errno)); 132 140 close(server_socket); 133 141 server_socket = -1; … … 136 144 } 137 145 138 if ((state = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) { 139 DEBUG(LOG_ERR, "couldn't get option from packet, ignoring"); 146 state = get_option(&packet, DHCP_MESSAGE_TYPE); 147 if (state == NULL) { 148 bb_error_msg("cannot get option from packet, ignoring"); 140 149 continue; 141 150 } … … 144 153 static_lease_ip = getIpByMac(server_config.static_leases, &packet.chaddr); 145 154 146 if(static_lease_ip) 147 { 148 printf("Found static lease: %x\n", static_lease_ip); 155 if (static_lease_ip) { 156 bb_info_msg("Found static lease: %x", static_lease_ip); 149 157 150 158 memcpy(&static_lease.chaddr, &packet.chaddr, 16); … … 153 161 154 162 lease = &static_lease; 155 156 } 157 else 158 { 159 lease = find_lease_by_chaddr(packet.chaddr); 163 } else { 164 lease = find_lease_by_chaddr(packet.chaddr); 160 165 } 161 166 162 167 switch (state[0]) { 163 168 case DHCPDISCOVER: 164 DEBUG( LOG_INFO,"received DISCOVER");169 DEBUG("Received DISCOVER"); 165 170 166 171 if (sendOffer(&packet) < 0) { 167 LOG(LOG_ERR,"send OFFER failed");172 bb_error_msg("send OFFER failed"); 168 173 } 169 174 break; 170 175 case DHCPREQUEST: 171 DEBUG( LOG_INFO,"received REQUEST");176 DEBUG("received REQUEST"); 172 177 173 178 requested = get_option(&packet, DHCP_REQUESTED_IP); … … 180 185 if (server_id) { 181 186 /* SELECTING State */ 182 DEBUG(LOG_INFO, "server_id = %08x", ntohl(server_id_align)); 183 if (server_id_align == server_config.server && requested && 184 requested_align == lease->yiaddr) { 187 DEBUG("server_id = %08x", ntohl(server_id_align)); 188 if (server_id_align == server_config.server && requested 189 && requested_align == lease->yiaddr 190 ) { 185 191 sendACK(&packet, lease->yiaddr); 186 192 } 193 } else if (requested) { 194 /* INIT-REBOOT State */ 195 if (lease->yiaddr == requested_align) 196 sendACK(&packet, lease->yiaddr); 197 else 198 sendNAK(&packet); 199 } else if (lease->yiaddr == packet.ciaddr) { 200 /* RENEWING or REBINDING State */ 201 sendACK(&packet, lease->yiaddr); 187 202 } else { 188 if (requested) { 189 /* INIT-REBOOT State */ 190 if (lease->yiaddr == requested_align) 191 sendACK(&packet, lease->yiaddr); 192 else sendNAK(&packet); 193 } else { 194 /* RENEWING or REBINDING State */ 195 if (lease->yiaddr == packet.ciaddr) 196 sendACK(&packet, lease->yiaddr); 197 else { 198 /* don't know what to do!!!! */ 199 sendNAK(&packet); 200 } 201 } 203 /* don't know what to do!!!! */ 204 sendNAK(&packet); 202 205 } 203 206 … … 208 211 } else if (requested) { 209 212 /* INIT-REBOOT State */ 210 if ((lease = find_lease_by_yiaddr(requested_align))) { 213 lease = find_lease_by_yiaddr(requested_align); 214 if (lease) { 211 215 if (lease_expired(lease)) { 212 216 /* probably best if we drop this lease */ 213 217 memset(lease->chaddr, 0, 16); 214 218 /* make some contention for this address */ 215 } else sendNAK(&packet); 216 } else if (requested_align < server_config.start || 217 requested_align > server_config.end) { 218 sendNAK(&packet); 219 } /* else remain silent */ 219 } else 220 sendNAK(&packet); 221 } else { 222 uint32_t r = ntohl(requested_align); 223 if (r < server_config.start_ip 224 || r > server_config.end_ip 225 ) { 226 sendNAK(&packet); 227 } 228 /* else remain silent */ 229 } 220 230 221 231 } else { 222 232 /* RENEWING or REBINDING State */ 223 233 } 224 234 break; 225 235 case DHCPDECLINE: 226 DEBUG( LOG_INFO,"received DECLINE");236 DEBUG("Received DECLINE"); 227 237 if (lease) { 228 238 memset(lease->chaddr, 0, 16); … … 231 241 break; 232 242 case DHCPRELEASE: 233 DEBUG(LOG_INFO,"received RELEASE"); 234 if (lease) lease->expires = time(0); 243 DEBUG("Received RELEASE"); 244 if (lease) 245 lease->expires = time(0); 235 246 break; 236 247 case DHCPINFORM: 237 DEBUG( LOG_INFO,"received INFORM");248 DEBUG("Received INFORM"); 238 249 send_inform(&packet); 239 250 break; 240 251 default: 241 LOG(LOG_WARNING, "unsupported DHCP message (%02x) -- ignoring", state[0]); 242 } 243 } 244 245 return 0; 252 bb_info_msg("Unsupported DHCP message (%02x) - ignoring", state[0]); 253 } 254 } 255 ret0: 256 retval = 0; 257 ret: 258 /*if (server_config.pidfile) - server_config.pidfile is never NULL */ 259 remove_pidfile(server_config.pidfile); 260 return retval; 246 261 } 247
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