int main(int argc, char *argv[]) #endif { fd_set rfds; struct timeval tv; int server_socket = -1; int bytes, retval; struct dhcpMessage packet; uint8_t *state; uint8_t *server_id, *requested; uint32_t server_id_align, requested_align; unsigned long timeout_end; struct option_set *option; struct dhcpOfferedAddr *lease; struct dhcpOfferedAddr static_lease; int max_sock; unsigned long num_ips; uint32_t static_lease_ip; memset(&server_config, 0, sizeof(struct server_config_t)); read_config(argc < 2 ? DHCPD_CONF_FILE : argv[1]); /* Start the log, sanitize fd's, and write a pid file */ start_log_and_pid("udhcpd", server_config.pidfile); if ((option = find_option(server_config.options, DHCP_LEASE_TIME))) { memcpy(&server_config.lease, option->data + 2, 4); server_config.lease = ntohl(server_config.lease); } else server_config.lease = LEASE_TIME; /* it is not impossible */ if (server_config.end < server_config.start) { uint32_t tmp_ip = server_config.start; server_config.start = server_config.end ; server_config.end = tmp_ip; } /* Sanity check */ num_ips = ntohl(server_config.end) - ntohl(server_config.start) + 1; if (server_config.max_leases > num_ips) { LOG(LOG_ERR, "max_leases value (%lu) not sane, " "setting to %lu instead", server_config.max_leases, num_ips); server_config.max_leases = num_ips; } if (dhcps_shm_init() != 0) return -1; leases = xcalloc(server_config.max_leases, sizeof(struct dhcpOfferedAddr)); memset(leases, 0, server_config.max_leases * sizeof(struct dhcpOfferedAddr)); //read_leases(server_config.lease_file); if (read_interface(server_config.interface, &server_config.ifindex, &server_config.server, server_config.arp) < 0) return 1; #ifndef UDHCP_DEBUG background(server_config.pidfile); /* hold lock during fork. */ #endif /* Setup the signal pipe */ udhcp_sp_setup(); timeout_end = uptime()/*time(0)*/ + server_config.auto_time; while(1) { /* loop until universe collapses */ if (server_socket < 0) if ((server_socket = listen_socket(INADDR_ANY, SERVER_PORT, server_config.interface)) < 0) { LOG(LOG_ERR, "FATAL: couldn't create server socket, %m"); return 2; } max_sock = udhcp_sp_fd_set(&rfds, server_socket); if (server_config.auto_time) { tv.tv_sec = timeout_end - uptime()/*time(0)*/; tv.tv_usec = 0; } if (!server_config.auto_time || tv.tv_sec > 0) { retval = select(max_sock + 1, &rfds, NULL, NULL, server_config.auto_time ? &tv : NULL); } else retval = 0; /* If we already timed out, fall through */ if (retval == 0) { write_leases(); timeout_end = uptime()/*time(0)*/ + server_config.auto_time; continue; } else if (retval < 0 && errno != EINTR) { DEBUG(LOG_INFO, "error on select"); continue; } switch (udhcp_sp_read(&rfds)) { case SIGUSR1: LOG(LOG_INFO, "Received a SIGUSR1"); write_leases(); /* why not just reset the timeout, eh */ timeout_end = uptime()/*time(0)*/ + server_config.auto_time; continue; case SIGUSR2: LOG(LOG_INFO, "Received a SIGUSR2, now DHCP SERVER restart"); if (execv(argv[0], argv) == -1) printf("errno:%d\n", errno); /* NEVER reach here except execv failed! */ break; case SIGTERM: LOG(LOG_INFO, "Received a SIGTERM"); return 0; case 0: break; /* no signal */ default: continue; /* signal or error (probably EINTR) */ } if ((bytes = get_packet(&packet, server_socket)) < 0) { /* this waits for a packet - idle */ if (bytes == -1 && errno != EINTR) { DEBUG(LOG_INFO, "error on read, %m, reopening socket"); close(server_socket); server_socket = -1; } continue; } if ((state = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) { DEBUG(LOG_ERR, "couldn't get option from packet, ignoring"); continue; } //printBuf(&packet, sizeof(struct dhcpMessage)); lease = find_lease_by_chaddr(packet.chaddr); if (!lease) { /* Look for a static lease */ static_lease_ip = getIpByMac(server_config.static_leases, &packet.chaddr); /* found */ if(static_lease_ip) { memcpy(&static_lease.chaddr, &packet.chaddr, 16); static_lease.yiaddr = static_lease_ip; static_lease.expires = 0; lease = &static_lease; } /* else { lease = find_lease_by_chaddr(packet.chaddr); } */ } switch (state[0]) { case DHCPDISCOVER: //DEBUG(LOG_INFO,"received DISCOVER"); msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPS:Recv DISCOVER from %02X:%02X:%02X:%02X:%02X:%02X", packet.chaddr[0], packet.chaddr[1], packet.chaddr[2], packet.chaddr[3], packet.chaddr[4], packet.chaddr[5]); if (sendOffer(&packet) < 0) { LOG(LOG_ERR, "send OFFER failed"); } break; case DHCPREQUEST: //DEBUG(LOG_INFO, "received REQUEST"); msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPS:Recv REQUEST from %02X:%02X:%02X:%02X:%02X:%02X", packet.chaddr[0], packet.chaddr[1], packet.chaddr[2], packet.chaddr[3], packet.chaddr[4], packet.chaddr[5]); requested = get_option(&packet, DHCP_REQUESTED_IP); server_id = get_option(&packet, DHCP_SERVER_ID); if (requested) memcpy(&requested_align, requested, 4); if (server_id) memcpy(&server_id_align, server_id, 4); if (lease) { if (server_id) { /* SELECTING State */ DEBUG(LOG_INFO, "server_id = %08x", ntohl(server_id_align)); if (server_id_align == server_config.server && requested && requested_align == lease->yiaddr) { sendACK(&packet, lease->yiaddr); } else { msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPS:Wrong Server id or request an invalid ip"); sendNAK(&packet); } } else { if (requested) { /* INIT-REBOOT State */ if (lease->yiaddr == requested_align) sendACK(&packet, lease->yiaddr); else { msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPS:Server id not found and request an invalid ip"); sendNAK(&packet); } } else { /* RENEWING or REBINDING State */ if (lease->yiaddr == packet.ciaddr) sendACK(&packet, lease->yiaddr); else { /* don't know what to do!!!! */ msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPS:Server id and requested ip not found"); msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPS:%x %x", lease->yiaddr, packet.ciaddr); sendNAK(&packet); } } } /* what to do if we have no record of the client */ } else if (server_id) { /* SELECTING State */ } else if (requested) { /* INIT-REBOOT State */ if ((lease = find_lease_by_yiaddr(requested_align))) { /* Requested IP already reserved by other one */ if (lease_expired(lease)) { /* probably best if we drop this lease */ memset(lease->chaddr, 0, 16); check_and_ack(&packet, requested_align); /* make some contention for this address */ } else /* still reserved by someone */ { msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPS:REQUEST ip %x already reserved by %02X:%02X:%02X:%02X:%02X:%02X", requested_align, lease->chaddr[0], lease->chaddr[1], lease->chaddr[2], lease->chaddr[3], lease->chaddr[4], lease->chaddr[5]); sendNAK(&packet); } } else /*if (requested_align < server_config.start || requested_align > server_config.end)*/ { check_and_ack(&packet, requested_align); } /* else remain silent */ } else { /* error state, just reply NAK modified by tiger 20090927 */ sendNAK(&packet); } break; case DHCPDECLINE: //DEBUG(LOG_INFO,"received DECLINE"); msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPS:Recv DECLINE from %02X:%02X:%02X:%02X:%02X:%02X", packet.chaddr[0], packet.chaddr[1], packet.chaddr[2], packet.chaddr[3], packet.chaddr[4], packet.chaddr[5]); if (lease) { memset(lease->chaddr, 0, 16); lease->expires = uptime()/*time(0)*/ + server_config.decline_time; } break; case DHCPRELEASE: //DEBUG(LOG_INFO,"received RELEASE"); msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPS:Recv RELEASE from %02X:%02X:%02X:%02X:%02X:%02X", packet.chaddr[0], packet.chaddr[1], packet.chaddr[2], packet.chaddr[3], packet.chaddr[4], packet.chaddr[5]); if (lease) { /* Delete the lease, lsz 080221 */ #if 1 memset(lease, 0, sizeof(struct dhcpOfferedAddr)); #else lease->expires = uptime()/*time(0)*/; #endif } break; case DHCPINFORM: //DEBUG(LOG_INFO,"received INFORM"); msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPS:Recv INFORM from %02X:%02X:%02X:%02X:%02X:%02X", packet.chaddr[0], packet.chaddr[1], packet.chaddr[2], packet.chaddr[3], packet.chaddr[4], packet.chaddr[5]); send_inform(&packet); break; default: LOG(LOG_WARNING, "unsupported DHCP message (%02x) -- ignoring", state[0]); } } return 0; }
int main(int argc, char *argv[]) #endif { uint8_t *temp, *message; unsigned long t1 = 0, t2 = 0, xid = 0; unsigned long start = 0, lease; fd_set rfds; int retval; struct timeval tv; int c, len; struct dhcpMessage packet; struct in_addr temp_addr; time_t now; int max_fd; int sig; static const struct option arg_options[] = { {"clientid", required_argument, 0, 'c'}, {"foreground", no_argument, 0, 'f'}, {"background", no_argument, 0, 'b'}, {"hostname", required_argument, 0, 'H'}, {"hostname", required_argument, 0, 'h'}, {"interface", required_argument, 0, 'i'}, {"now", no_argument, 0, 'n'}, {"pidfile", required_argument, 0, 'p'}, {"quit", no_argument, 0, 'q'}, {"request", required_argument, 0, 'r'}, {"script", required_argument, 0, 's'}, {"version", no_argument, 0, 'v'}, {0, 0, 0, 0} }; /* get options */ while (1) { int option_index = 0; c = getopt_long(argc, argv, "c:fbH:h:i:np:qr:s:v", arg_options, &option_index); if (c == -1) break; switch (c) { case 'c': len = strlen(optarg) > 255 ? 255 : strlen(optarg); if (client_config.clientid) free(client_config.clientid); client_config.clientid = xmalloc(len + 2); client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID; client_config.clientid[OPT_LEN] = len; client_config.clientid[OPT_DATA] = '\0'; strncpy(client_config.clientid + OPT_DATA, optarg, len); break; case 'f': client_config.foreground = 1; break; case 'b': client_config.background_if_no_lease = 1; break; case 'h': case 'H': len = strlen(optarg) > 255 ? 255 : strlen(optarg); if (client_config.hostname) free(client_config.hostname); client_config.hostname = xmalloc(len + 2); client_config.hostname[OPT_CODE] = DHCP_HOST_NAME; client_config.hostname[OPT_LEN] = len; strncpy(client_config.hostname + 2, optarg, len); break; case 'i': client_config.interface = optarg; break; case 'n': client_config.abort_if_no_lease = 1; break; case 'p': client_config.pidfile = optarg; break; case 'q': client_config.quit_after_lease = 1; break; case 'r': requested_ip = inet_addr(optarg); break; case 's': client_config.script = optarg; break; case 'v': printf("udhcpcd, version %s\n\n", VERSION); return 0; break; default: show_usage(); } } /* Start the log, sanitize fd's, and write a pid file */ start_log_and_pid("udhcpc", client_config.pidfile); if (read_interface(client_config.interface, &client_config.ifindex, NULL, client_config.arp) < 0) return 1; if (!client_config.clientid) { client_config.clientid = xmalloc(6 + 3); client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID; client_config.clientid[OPT_LEN] = 7; client_config.clientid[OPT_DATA] = 1; memcpy(client_config.clientid + 3, client_config.arp, 6); } /* setup the signal pipe */ udhcp_sp_setup(); state = INIT_SELECTING; run_script(NULL, "deconfig"); change_mode(LISTEN_RAW); for (;;) { tv.tv_sec = timeout - time(0); tv.tv_usec = 0; if (listen_mode != LISTEN_NONE && fd < 0) { if (listen_mode == LISTEN_KERNEL) fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface); else fd = raw_socket(client_config.ifindex); if (fd < 0) { LOG(LOG_ERR, "FATAL: couldn't listen on socket, %m"); return 0; } } max_fd = udhcp_sp_fd_set(&rfds, fd); if (tv.tv_sec > 0) { DEBUG(LOG_INFO, "Waiting on select..."); retval = select(max_fd + 1, &rfds, NULL, NULL, &tv); } else retval = 0; /* If we already timed out, fall through */ now = time(0); if (retval == 0) { /* timeout dropped to zero */ switch (state) { case INIT_SELECTING: if (packet_num < 3) { if (packet_num == 0) xid = random_xid(); /* send discover packet */ send_discover(xid, requested_ip); /* broadcast */ timeout = now + ((packet_num == 2) ? 4 : 2); packet_num++; } else { run_script(NULL, "leasefail"); if (client_config.background_if_no_lease) { LOG(LOG_INFO, "No lease, forking to background."); client_background(); } else if (client_config.abort_if_no_lease) { LOG(LOG_INFO, "No lease, failing."); return 1; } /* wait to try again */ packet_num = 0; timeout = now + 60; } break; case RENEW_REQUESTED: case REQUESTING: if (packet_num < 3) { /* send request packet */ if (state == RENEW_REQUESTED) send_renew(xid, server_addr, requested_ip); /* unicast */ else send_selecting(xid, server_addr, requested_ip); /* broadcast */ timeout = now + ((packet_num == 2) ? 10 : 2); packet_num++; } else { /* timed out, go back to init state */ if (state == RENEW_REQUESTED) run_script(NULL, "deconfig"); state = INIT_SELECTING; timeout = now; packet_num = 0; change_mode(LISTEN_RAW); } break; case BOUND: /* Lease is starting to run out, time to enter renewing state */ state = RENEWING; change_mode(LISTEN_KERNEL); DEBUG(LOG_INFO, "Entering renew state"); /* fall right through */ case RENEWING: /* Either set a new T1, or enter REBINDING state */ if ((t2 - t1) <= (lease / 14400 + 1)) { /* timed out, enter rebinding state */ state = REBINDING; timeout = now + (t2 - t1); DEBUG(LOG_INFO, "Entering rebinding state"); } else { /* send a request packet */ send_renew(xid, server_addr, requested_ip); /* unicast */ t1 = (t2 - t1) / 2 + t1; timeout = t1 + start; } break; case REBINDING: /* Either set a new T2, or enter INIT state */ if ((lease - t2) <= (lease / 14400 + 1)) { /* timed out, enter init state */ state = INIT_SELECTING; LOG(LOG_INFO, "Lease lost, entering init state"); run_script(NULL, "deconfig"); timeout = now; packet_num = 0; change_mode(LISTEN_RAW); } else { /* send a request packet */ send_renew(xid, 0, requested_ip); /* broadcast */ t2 = (lease - t2) / 2 + t2; timeout = t2 + start; } break; case RELEASED: /* yah, I know, *you* say it would never happen */ timeout = 0x7fffffff; break; } } else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(fd, &rfds)) { /* a packet is ready, read it */ if (listen_mode == LISTEN_KERNEL) len = get_packet(&packet, fd); else len = get_raw_packet(&packet, fd); if (len == -1 && errno != EINTR) { DEBUG(LOG_INFO, "error on read, %m, reopening socket"); change_mode(listen_mode); /* just close and reopen */ } if (len < 0) continue; if (packet.xid != xid) { DEBUG(LOG_INFO, "Ignoring XID %lx (our xid is %lx)", (unsigned long) packet.xid, xid); continue; } if ((message = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) { DEBUG(LOG_ERR, "couldnt get option from packet -- ignoring"); continue; } switch (state) { case INIT_SELECTING: /* Must be a DHCPOFFER to one of our xid's */ if (*message == DHCPOFFER) { if ((temp = get_option(&packet, DHCP_SERVER_ID))) { memcpy(&server_addr, temp, 4); xid = packet.xid; requested_ip = packet.yiaddr; /* enter requesting state */ state = REQUESTING; timeout = now; packet_num = 0; } else { DEBUG(LOG_ERR, "No server ID in message"); } } break; case RENEW_REQUESTED: case REQUESTING: case RENEWING: case REBINDING: if (*message == DHCPACK) { if (!(temp = get_option(&packet, DHCP_LEASE_TIME))) { LOG(LOG_ERR, "No lease time with ACK, using 1 hour lease"); lease = 60 * 60; } else { memcpy(&lease, temp, 4); lease = ntohl(lease); } /* enter bound state */ t1 = lease / 2; /* little fixed point for n * .875 */ t2 = (lease * 0x7) >> 3; temp_addr.s_addr = packet.yiaddr; LOG(LOG_INFO, "Lease of %s obtained, lease time %ld", inet_ntoa(temp_addr), lease); start = now; timeout = t1 + start; requested_ip = packet.yiaddr; run_script(&packet, ((state == RENEWING || state == REBINDING) ? "renew" : "bound")); state = BOUND; change_mode(LISTEN_NONE); if (client_config.quit_after_lease) return 0; if (!client_config.foreground) client_background(); } else if (*message == DHCPNAK) { /* return to init state */ LOG(LOG_INFO, "Received DHCP NAK"); run_script(&packet, "nak"); if (state != REQUESTING) run_script(NULL, "deconfig"); state = INIT_SELECTING; timeout = now; requested_ip = 0; packet_num = 0; change_mode(LISTEN_RAW); sleep(3); /* avoid excessive network traffic */ } break; /* case BOUND, RELEASED: - ignore all packets */ } } else if (retval > 0 && (sig = udhcp_sp_read(&rfds))) {
int udhcpd_main(int argc, char **argv) { fd_set rfds; struct timeval tv; int server_socket = -1, bytes, retval, max_sock; struct dhcpMessage packet; uint8_t *state, *server_id, *requested; uint32_t server_id_align, requested_align, static_lease_ip; unsigned timeout_end; unsigned num_ips; unsigned opt; struct option_set *option; struct dhcpOfferedAddr *lease, static_lease; opt = getopt32(argv, "fS"); argv += optind; if (!(opt & 1)) { /* no -f */ bb_daemonize_or_rexec(0, argv); logmode &= ~LOGMODE_STDIO; } if (opt & 2) { /* -S */ openlog(applet_name, LOG_PID, LOG_LOCAL0); logmode |= LOGMODE_SYSLOG; } /* Would rather not do read_config before daemonization - * otherwise NOMMU machines will parse config twice */ read_config(argv[0] ? argv[0] : DHCPD_CONF_FILE); /* Make sure fd 0,1,2 are open */ bb_sanitize_stdio(); /* Equivalent of doing a fflush after every \n */ setlinebuf(stdout); /* Create pidfile */ write_pidfile(server_config.pidfile); /* if (!..) bb_perror_msg("cannot create pidfile %s", pidfile); */ bb_info_msg("%s (v"BB_VER") started", applet_name); option = find_option(server_config.options, DHCP_LEASE_TIME); server_config.lease = LEASE_TIME; if (option) { memcpy(&server_config.lease, option->data + 2, 4); server_config.lease = ntohl(server_config.lease); } /* Sanity check */ num_ips = server_config.end_ip - server_config.start_ip + 1; if (server_config.max_leases > num_ips) { bb_error_msg("max_leases=%u is too big, setting to %u", (unsigned)server_config.max_leases, num_ips); server_config.max_leases = num_ips; } leases = xzalloc(server_config.max_leases * sizeof(*leases)); read_leases(server_config.lease_file); if (read_interface(server_config.interface, &server_config.ifindex, &server_config.server, server_config.arp)) { retval = 1; goto ret; } /* Setup the signal pipe */ udhcp_sp_setup(); timeout_end = monotonic_sec() + server_config.auto_time; while (1) { /* loop until universe collapses */ if (server_socket < 0) { server_socket = listen_socket(/*INADDR_ANY,*/ SERVER_PORT, server_config.interface); } max_sock = udhcp_sp_fd_set(&rfds, server_socket); if (server_config.auto_time) { tv.tv_sec = timeout_end - monotonic_sec(); tv.tv_usec = 0; } retval = 0; if (!server_config.auto_time || tv.tv_sec > 0) { retval = select(max_sock + 1, &rfds, NULL, NULL, server_config.auto_time ? &tv : NULL); } if (retval == 0) { write_leases(); timeout_end = monotonic_sec() + server_config.auto_time; continue; } if (retval < 0 && errno != EINTR) { DEBUG("error on select"); continue; } switch (udhcp_sp_read(&rfds)) { case SIGUSR1: bb_info_msg("Received a SIGUSR1"); write_leases(); /* why not just reset the timeout, eh */ timeout_end = monotonic_sec() + server_config.auto_time; continue; case SIGTERM: bb_info_msg("Received a SIGTERM"); goto ret0; case 0: break; /* no signal */ default: continue; /* signal or error (probably EINTR) */ } bytes = udhcp_recv_packet(&packet, server_socket); /* this waits for a packet - idle */ if (bytes < 0) { if (bytes == -1 && errno != EINTR) { DEBUG("error on read, %s, reopening socket", strerror(errno)); close(server_socket); server_socket = -1; } continue; } state = get_option(&packet, DHCP_MESSAGE_TYPE); if (state == NULL) { bb_error_msg("cannot get option from packet, ignoring"); continue; } /* Look for a static lease */ static_lease_ip = getIpByMac(server_config.static_leases, &packet.chaddr); if (static_lease_ip) { bb_info_msg("Found static lease: %x", static_lease_ip); memcpy(&static_lease.chaddr, &packet.chaddr, 16); static_lease.yiaddr = static_lease_ip; static_lease.expires = 0; lease = &static_lease; } else { lease = find_lease_by_chaddr(packet.chaddr); } switch (state[0]) { case DHCPDISCOVER: DEBUG("Received DISCOVER"); if (sendOffer(&packet) < 0) { bb_error_msg("send OFFER failed"); } /* circle test Stat. add by wangpu begin */ g_offercount ++; printf("Circle test: [DHCPS] send OFFER packet num:[%d]\n",g_offercount); memset(g_acCmd,0,sizeof(g_acCmd)); memset(g_interface,0,sizeof(g_interface)); sprintf(g_interface,"%s",server_config.interface); sprintf(g_acCmd,"echo %d > /var/circle/%s",g_offercount,g_interface); system(g_acCmd); /* circle test Stat. add by wangpu end */ break; case DHCPREQUEST: DEBUG("received REQUEST"); #if 0 /* ?¡¤??2a¨º? add by wangpu begin */ g_offercount ++; printf("Circle test: [DHCPS] send OFFER packet num:[%d]\n",g_offercount); memset(g_acCmd,0,sizeof(g_acCmd)); memset(g_interface,0,sizeof(g_interface)); sprintf(g_interface,"%s",server_config.interface); sprintf(g_acCmd,"echo %d > /var/circle/%s",g_offercount,g_interface); system(g_acCmd); /* ?¡¤??2a¨º? add by wangpu begin */ #endif requested = get_option(&packet, DHCP_REQUESTED_IP); server_id = get_option(&packet, DHCP_SERVER_ID); if (requested) memcpy(&requested_align, requested, 4); if (server_id) memcpy(&server_id_align, server_id, 4); if (lease) { if (server_id) { /* SELECTING State */ DEBUG("server_id = %08x", ntohl(server_id_align)); if (server_id_align == server_config.server && requested && requested_align == lease->yiaddr ) { sendACK(&packet, lease->yiaddr); } } else if (requested) { /* INIT-REBOOT State */ if (lease->yiaddr == requested_align) sendACK(&packet, lease->yiaddr); else sendNAK(&packet); } else if (lease->yiaddr == packet.ciaddr) { /* RENEWING or REBINDING State */ sendACK(&packet, lease->yiaddr); } else { /* don't know what to do!!!! */ sendNAK(&packet); } /* what to do if we have no record of the client */ } else if (server_id) { /* SELECTING State */ } else if (requested) { /* INIT-REBOOT State */ lease = find_lease_by_yiaddr(requested_align); if (lease) { if (lease_expired(lease)) { /* probably best if we drop this lease */ memset(lease->chaddr, 0, 16); /* make some contention for this address */ } else sendNAK(&packet); } else { uint32_t r = ntohl(requested_align); if (r < server_config.start_ip || r > server_config.end_ip ) { sendNAK(&packet); } /* else remain silent */ } } else { /* RENEWING or REBINDING State */ } break; case DHCPDECLINE: DEBUG("Received DECLINE"); if (lease) { memset(lease->chaddr, 0, 16); lease->expires = time(0) + server_config.decline_time; } break; case DHCPRELEASE: DEBUG("Received RELEASE"); if (lease) lease->expires = time(0); break; case DHCPINFORM: DEBUG("Received INFORM"); send_inform(&packet); break; default: bb_info_msg("Unsupported DHCP message (%02x) - ignoring", state[0]); } } ret0: retval = 0; ret: /*if (server_config.pidfile) - server_config.pidfile is never NULL */ remove_pidfile(server_config.pidfile); return retval; }
int udhcpc_main(int argc, char **argv) { uint8_t *temp, *message; char *str_c, *str_V, *str_h, *str_F, *str_r, *str_T, *str_t; unsigned long t1 = 0, t2 = 0, xid = 0; unsigned long start = 0, lease = 0; long now; unsigned opt; int max_fd; int sig; int retval; int len; int no_clientid = 0; fd_set rfds; struct timeval tv; struct dhcpMessage packet; struct in_addr temp_addr; enum { OPT_c = 1 << 0, OPT_C = 1 << 1, OPT_V = 1 << 2, OPT_f = 1 << 3, OPT_b = 1 << 4, OPT_H = 1 << 5, OPT_h = 1 << 6, OPT_F = 1 << 7, OPT_i = 1 << 8, OPT_n = 1 << 9, OPT_p = 1 << 10, OPT_q = 1 << 11, OPT_R = 1 << 12, OPT_r = 1 << 13, OPT_s = 1 << 14, OPT_T = 1 << 15, OPT_t = 1 << 16, OPT_v = 1 << 17, }; #if ENABLE_GETOPT_LONG static const struct option arg_options[] = { { "clientid", required_argument, 0, 'c' }, { "clientid-none", no_argument, 0, 'C' }, { "vendorclass", required_argument, 0, 'V' }, { "foreground", no_argument, 0, 'f' }, { "background", no_argument, 0, 'b' }, { "hostname", required_argument, 0, 'H' }, { "hostname", required_argument, 0, 'h' }, { "fqdn", required_argument, 0, 'F' }, { "interface", required_argument, 0, 'i' }, { "now", no_argument, 0, 'n' }, { "pidfile", required_argument, 0, 'p' }, { "quit", no_argument, 0, 'q' }, { "release", no_argument, 0, 'R' }, { "request", required_argument, 0, 'r' }, { "script", required_argument, 0, 's' }, { "timeout", required_argument, 0, 'T' }, { "version", no_argument, 0, 'v' }, { "retries", required_argument, 0, 't' }, { 0, 0, 0, 0 } }; #endif /* Default options. */ client_config.interface = "eth0"; client_config.script = DEFAULT_SCRIPT; client_config.retries = 3; client_config.timeout = 3; /* Parse command line */ opt_complementary = "?:c--C:C--c" // mutually exclusive ":hH:Hh"; // -h and -H are the same #if ENABLE_GETOPT_LONG applet_long_options = arg_options; #endif opt = getopt32(argc, argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:v", &str_c, &str_V, &str_h, &str_h, &str_F, &client_config.interface, &client_config.pidfile, &str_r, &client_config.script, &str_T, &str_t ); if (opt & OPT_c) client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, str_c, 0); if (opt & OPT_C) no_clientid = 1; if (opt & OPT_V) client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, str_V, 0); if (opt & OPT_f) client_config.foreground = 1; if (opt & OPT_b) client_config.background_if_no_lease = 1; if (opt & OPT_h) client_config.hostname = alloc_dhcp_option(DHCP_HOST_NAME, str_h, 0); if (opt & OPT_F) { client_config.fqdn = alloc_dhcp_option(DHCP_FQDN, str_F, 3); /* Flags: 0000NEOS S: 1 => Client requests Server to update A RR in DNS as well as PTR O: 1 => Server indicates to client that DNS has been updated regardless E: 1 => Name data is DNS format, i.e. <4>host<6>domain<4>com<0> not "host.domain.com" N: 1 => Client requests Server to not update DNS */ client_config.fqdn[OPT_DATA + 0] = 0x1; /* client_config.fqdn[OPT_DATA + 1] = 0; - redundant */ /* client_config.fqdn[OPT_DATA + 2] = 0; - redundant */ } // if (opt & OPT_i) client_config.interface = ... if (opt & OPT_n) client_config.abort_if_no_lease = 1; // if (opt & OPT_p) client_config.pidfile = ... if (opt & OPT_q) client_config.quit_after_lease = 1; if (opt & OPT_R) client_config.release_on_quit = 1; if (opt & OPT_r) requested_ip = inet_addr(str_r); // if (opt & OPT_s) client_config.script = ... if (opt & OPT_T) client_config.timeout = xatoi_u(str_T); if (opt & OPT_t) client_config.retries = xatoi_u(str_t); if (opt & OPT_v) { printf("version %s\n\n", BB_VER); return 0; } if (ENABLE_FEATURE_UDHCP_SYSLOG) { openlog(applet_name, LOG_PID, LOG_LOCAL0); logmode |= LOGMODE_SYSLOG; } if (read_interface(client_config.interface, &client_config.ifindex, NULL, client_config.arp) < 0) return 1; /* Sanitize fd's and write pidfile */ udhcp_make_pidfile(client_config.pidfile); /* if not set, and not suppressed, setup the default client ID */ if (!client_config.clientid && !no_clientid) { client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, "", 7); client_config.clientid[OPT_DATA] = 1; memcpy(client_config.clientid + OPT_DATA+1, client_config.arp, 6); } if (!client_config.vendorclass) client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, "udhcp "BB_VER, 0); /* setup the signal pipe */ udhcp_sp_setup(); state = INIT_SELECTING; udhcp_run_script(NULL, "deconfig"); change_mode(LISTEN_RAW); for (;;) { tv.tv_sec = timeout - uptime(); tv.tv_usec = 0; if (listen_mode != LISTEN_NONE && sockfd < 0) { if (listen_mode == LISTEN_KERNEL) sockfd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface); else sockfd = raw_socket(client_config.ifindex); } max_fd = udhcp_sp_fd_set(&rfds, sockfd); if (tv.tv_sec > 0) { DEBUG("Waiting on select..."); retval = select(max_fd + 1, &rfds, NULL, NULL, &tv); } else retval = 0; /* If we already timed out, fall through */ now = uptime(); if (retval == 0) { /* timeout dropped to zero */ switch (state) { case INIT_SELECTING: if (packet_num < client_config.retries) { if (packet_num == 0) xid = random_xid(); /* send discover packet */ send_discover(xid, requested_ip); /* broadcast */ timeout = now + client_config.timeout; packet_num++; } else { udhcp_run_script(NULL, "leasefail"); if (client_config.background_if_no_lease) { bb_info_msg("No lease, forking to background"); client_background(); } else if (client_config.abort_if_no_lease) { bb_info_msg("No lease, failing"); retval = 1; goto ret; } /* wait to try again */ packet_num = 0; timeout = now + 60; } break; case RENEW_REQUESTED: case REQUESTING: if (packet_num < client_config.retries) { /* send request packet */ if (state == RENEW_REQUESTED) send_renew(xid, server_addr, requested_ip); /* unicast */ else send_selecting(xid, server_addr, requested_ip); /* broadcast */ timeout = now + ((packet_num == 2) ? 10 : 2); packet_num++; } else { /* timed out, go back to init state */ if (state == RENEW_REQUESTED) udhcp_run_script(NULL, "deconfig"); state = INIT_SELECTING; timeout = now; packet_num = 0; change_mode(LISTEN_RAW); } break; case BOUND: /* Lease is starting to run out, time to enter renewing state */ state = RENEWING; change_mode(LISTEN_KERNEL); DEBUG("Entering renew state"); /* fall right through */ case RENEWING: /* Either set a new T1, or enter REBINDING state */ if ((t2 - t1) <= (lease / 14400 + 1)) { /* timed out, enter rebinding state */ state = REBINDING; timeout = now + (t2 - t1); DEBUG("Entering rebinding state"); } else { /* send a request packet */ send_renew(xid, server_addr, requested_ip); /* unicast */ t1 = (t2 - t1) / 2 + t1; timeout = t1 + start; } break; case REBINDING: /* Either set a new T2, or enter INIT state */ if ((lease - t2) <= (lease / 14400 + 1)) { /* timed out, enter init state */ state = INIT_SELECTING; bb_info_msg("Lease lost, entering init state"); udhcp_run_script(NULL, "deconfig"); timeout = now; packet_num = 0; change_mode(LISTEN_RAW); } else { /* send a request packet */ send_renew(xid, 0, requested_ip); /* broadcast */ t2 = (lease - t2) / 2 + t2; timeout = t2 + start; } break; case RELEASED: /* yah, I know, *you* say it would never happen */ timeout = 0x7fffffff; break; } } else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(sockfd, &rfds)) { /* a packet is ready, read it */ if (listen_mode == LISTEN_KERNEL) len = udhcp_get_packet(&packet, sockfd); else len = get_raw_packet(&packet, sockfd); if (len == -1 && errno != EINTR) { DEBUG("error on read, %s, reopening socket", strerror(errno)); change_mode(listen_mode); /* just close and reopen */ } if (len < 0) continue; if (packet.xid != xid) { DEBUG("Ignoring XID %lx (our xid is %lx)", (unsigned long) packet.xid, xid); continue; } /* Ignore packets that aren't for us */ if (memcmp(packet.chaddr, client_config.arp, 6)) { DEBUG("Packet does not have our chaddr - ignoring"); continue; } message = get_option(&packet, DHCP_MESSAGE_TYPE); if (message == NULL) { bb_error_msg("cannot get option from packet - ignoring"); continue; } switch (state) { case INIT_SELECTING: /* Must be a DHCPOFFER to one of our xid's */ if (*message == DHCPOFFER) { temp = get_option(&packet, DHCP_SERVER_ID); if (temp) { /* can be misaligned, thus memcpy */ memcpy(&server_addr, temp, 4); xid = packet.xid; requested_ip = packet.yiaddr; /* enter requesting state */ state = REQUESTING; timeout = now; packet_num = 0; } else { bb_error_msg("no server ID in message"); } } break; case RENEW_REQUESTED: case REQUESTING: case RENEWING: case REBINDING: if (*message == DHCPACK) { temp = get_option(&packet, DHCP_LEASE_TIME); if (!temp) { bb_error_msg("no lease time with ACK, using 1 hour lease"); lease = 60 * 60; } else { /* can be misaligned, thus memcpy */ memcpy(&lease, temp, 4); lease = ntohl(lease); } /* enter bound state */ t1 = lease / 2; /* little fixed point for n * .875 */ t2 = (lease * 0x7) >> 3; temp_addr.s_addr = packet.yiaddr; bb_info_msg("Lease of %s obtained, lease time %ld", inet_ntoa(temp_addr), lease); start = now; timeout = t1 + start; requested_ip = packet.yiaddr; udhcp_run_script(&packet, ((state == RENEWING || state == REBINDING) ? "renew" : "bound")); state = BOUND; change_mode(LISTEN_NONE); if (client_config.quit_after_lease) { if (client_config.release_on_quit) perform_release(); goto ret0; } if (!client_config.foreground) client_background(); } else if (*message == DHCPNAK) { /* return to init state */ bb_info_msg("Received DHCP NAK"); udhcp_run_script(&packet, "nak"); if (state != REQUESTING) udhcp_run_script(NULL, "deconfig"); state = INIT_SELECTING; timeout = now; requested_ip = 0; packet_num = 0; change_mode(LISTEN_RAW); sleep(3); /* avoid excessive network traffic */ } break; /* case BOUND, RELEASED: - ignore all packets */ } } else if (retval > 0 && (sig = udhcp_sp_read(&rfds))) {
int main(int argc, char *argv[]) #endif { fd_set rfds; struct timeval tv; int server_socket = -1; int bytes, retval; struct dhcpMessage packet; uint8_t *state; uint8_t *server_id, *requested; uint8_t *hostname; uint32_t server_id_align, requested_align; unsigned long timeout_end; struct option_set *option; struct dhcpOfferedAddr *lease; struct dhcpOfferedAddr static_lease; int max_sock; unsigned long num_ips; uint32_t static_lease_ip; memset(&server_config, 0, sizeof(struct server_config_t)); read_config(argc < 2 ? DHCPD_CONF_FILE : argv[1]); read_config_static_leases(DHCPD_STATIC_LEASES_FILE); /* Start the log, sanitize fd's, and write a pid file */ start_log_and_pid("udhcpd", server_config.pidfile); if ((option = find_option(server_config.options, DHCP_LEASE_TIME))) { memcpy(&server_config.lease, option->data + 2, 4); server_config.lease = ntohl(server_config.lease); } else server_config.lease = LEASE_TIME; /* Sanity check */ num_ips = ntohl(server_config.end) - ntohl(server_config.start) + 1; if (server_config.max_leases > num_ips) { // LOG(LOG_ERR, "max_leases value (%lu) not sane, " // "setting to %lu instead", // server_config.max_leases, num_ips); server_config.max_leases = num_ips; } leases = xcalloc(server_config.max_leases, sizeof(struct dhcpOfferedAddr)); read_leases(server_config.lease_file); if (read_interface(server_config.interface, &server_config.ifindex, &server_config.server, server_config.arp) < 0) return 1; #ifndef UDHCP_DEBUG background(server_config.pidfile); /* hold lock during fork. */ #endif /* Setup the signal pipe */ udhcp_sp_setup(); timeout_end = time(0) + server_config.auto_time; while(1) { /* loop until universe collapses */ if (server_socket < 0) if ((server_socket = listen_socket(INADDR_ANY, SERVER_PORT, server_config.interface)) < 0) { LOG(LOG_ERR, "FATAL: couldn't create server socket, %m"); return 2; } max_sock = udhcp_sp_fd_set(&rfds, server_socket); if (server_config.auto_time) { tv.tv_sec = timeout_end - time(0); tv.tv_usec = 0; } if (!server_config.auto_time || tv.tv_sec > 0) { retval = select(max_sock + 1, &rfds, NULL, NULL, server_config.auto_time ? &tv : NULL); } else retval = 0; /* If we already timed out, fall through */ if (retval == 0) { write_leases(); timeout_end = time(0) + server_config.auto_time; continue; } else if (retval < 0 && errno != EINTR) { DEBUG(LOG_INFO, "error on select"); continue; } switch (udhcp_sp_read(&rfds)) { case SIGUSR1: LOG(LOG_INFO, "Received a SIGUSR1"); write_leases(); /* why not just reset the timeout, eh */ timeout_end = time(0) + server_config.auto_time; continue; case SIGTERM: LOG(LOG_INFO, "Received a SIGTERM"); return 0; case 0: break; /* no signal */ default: continue; /* signal or error (probably EINTR) */ } if ((bytes = get_packet(&packet, server_socket)) < 0) { /* this waits for a packet - idle */ if (bytes == -1 && errno != EINTR) { DEBUG(LOG_INFO, "error on read, %m, reopening socket"); close(server_socket); server_socket = -1; } continue; } if ((state = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) { DEBUG(LOG_ERR, "couldn't get option from packet, ignoring"); continue; } /* Look for a static lease */ static_lease_ip = getIpByMac(server_config.static_leases, &packet.chaddr); if(static_lease_ip) { printf("Found static lease: %x\n", static_lease_ip); memcpy(&static_lease.chaddr, &packet.chaddr, 16); static_lease.yiaddr = static_lease_ip; static_lease.expires = 0; lease = &static_lease; } else { lease = find_lease_by_chaddr(packet.chaddr); } switch (state[0]) { case DHCPDISCOVER: DEBUG(LOG_INFO,"received DISCOVER"); if (sendOffer(&packet) < 0) { LOG(LOG_ERR, "send OFFER failed"); } break; case DHCPREQUEST: DEBUG(LOG_INFO, "received REQUEST"); requested = get_option(&packet, DHCP_REQUESTED_IP); server_id = get_option(&packet, DHCP_SERVER_ID); hostname = get_option(&packet, DHCP_HOST_NAME); if (requested) memcpy(&requested_align, requested, 4); if (server_id) memcpy(&server_id_align, server_id, 4); if (lease) { if (server_id) { /* SELECTING State */ DEBUG(LOG_INFO, "server_id = %08x", ntohl(server_id_align)); if (server_id_align == server_config.server && requested && requested_align == lease->yiaddr) { sendACK(&packet, lease->yiaddr); } } else { if (requested) { /* INIT-REBOOT State */ if (lease->yiaddr == requested_align) sendACK(&packet, lease->yiaddr); else sendNAK(&packet); } else { /* RENEWING or REBINDING State */ if (lease->yiaddr == packet.ciaddr) sendACK(&packet, lease->yiaddr); else { /* don't know what to do!!!! */ sendNAK(&packet); } } } if (hostname) { bytes = hostname[-1]; if (bytes >= (int) sizeof(lease->hostname)) bytes = sizeof(lease->hostname) - 1; strncpy(lease->hostname, hostname, bytes); lease->hostname[bytes] = '\0'; } else lease->hostname[0] = '\0'; /* what to do if we have no record of the client */ } else if (server_id) { /* SELECTING State */ } else if (requested) { /* INIT-REBOOT State */ if ((lease = find_lease_by_yiaddr(requested_align))) { if (lease_expired(lease)) { /* probably best if we drop this lease */ memset(lease->chaddr, 0, 16); /* make some contention for this address */ } else sendNAK(&packet); } else if (requested_align < server_config.start || requested_align > server_config.end) { sendNAK(&packet); } /* else remain silent */ } else { /* RENEWING or REBINDING State */ } break; case DHCPDECLINE: DEBUG(LOG_INFO,"received DECLINE"); if (lease) { memset(lease->chaddr, 0, 16); lease->expires = time(0) + server_config.decline_time; } break; case DHCPRELEASE: DEBUG(LOG_INFO,"received RELEASE"); if (lease) lease->expires = time(0); break; case DHCPINFORM: DEBUG(LOG_INFO,"received INFORM"); send_inform(&packet); break; default: LOG(LOG_WARNING, "unsupported DHCP message (%02x) -- ignoring", state[0]); } } return 0; }
int main(int argc, char *argv[]) #endif { uint8_t *temp, *message; unsigned long t1 = 0, t2 = 0, xid = 0; unsigned long start = 0, lease; fd_set rfds; int retval; struct timeval tv; int c, len; struct dhcpMessage packet; struct in_addr temp_addr; long now; int max_fd; int sig; int no_clientid = 0; int fail_times = 0; /* how many times that we fail to find a dhcp server */ int server_unicast = 0; static const struct option arg_options[] = { {"clientid", required_argument, 0, 'c'}, {"clientid-none", no_argument, 0, 'C'}, {"foreground", no_argument, 0, 'f'}, {"background", no_argument, 0, 'b'}, {"hostname", required_argument, 0, 'H'}, {"hostname", required_argument, 0, 'h'}, {"interface", required_argument, 0, 'i'}, {"now", no_argument, 0, 'n'}, {"pidfile", required_argument, 0, 'p'}, {"quit", no_argument, 0, 'q'}, {"request", required_argument, 0, 'r'}, {"script", required_argument, 0, 's'}, {"unicast", no_argument, 0, 'u'}, /* unicast flag */ {"version", no_argument, 0, 'v'}, {0, 0, 0, 0} }; /* get options */ while (1) { int option_index = 0; c = getopt_long(argc, argv, "c:CfbH:h:i:np:qr:s:uv", arg_options, &option_index); if (c == -1) break; switch (c) { case 'c': if (no_clientid) show_usage(); len = strlen(optarg) > 255 ? 255 : strlen(optarg); if (client_config.clientid) free(client_config.clientid); client_config.clientid = xmalloc(len + 2); client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID; client_config.clientid[OPT_LEN] = len; client_config.clientid[OPT_DATA] = '\0'; strncpy(client_config.clientid + OPT_DATA, optarg, len); break; case 'C': if (client_config.clientid) show_usage(); no_clientid = 1; break; case 'f': client_config.foreground = 1; break; case 'b': client_config.background_if_no_lease = 1; break; case 'h': case 'H': len = strlen(optarg) > 255 ? 255 : strlen(optarg); if (client_config.hostname) free(client_config.hostname); client_config.hostname = xmalloc(len + 2); client_config.hostname[OPT_CODE] = DHCP_HOST_NAME; client_config.hostname[OPT_LEN] = len; strncpy(client_config.hostname + 2, optarg, len); break; case 'i': client_config.interface = optarg; break; case 'n': client_config.abort_if_no_lease = 1; break; case 'p': client_config.pidfile = optarg; break; case 'q': client_config.quit_after_lease = 1; break; case 'r': requested_ip = inet_addr(optarg); break; case 's': client_config.script = optarg; break; case 'u': server_unicast = 1; break; case 'v': printf("udhcpcd, version %s\n\n", VERSION); return 0; break; default: show_usage(); } } /* Start the log, sanitize fd's, and write a pid file */ start_log_and_pid("udhcpc", client_config.pidfile); if (read_interface(client_config.interface, &client_config.ifindex, NULL, client_config.arp) < 0) return 1; /* if not set, and not suppressed, setup the default client ID */ if (!client_config.clientid && !no_clientid) { client_config.clientid = xmalloc(6 + 3); client_config.clientid[OPT_CODE] = DHCP_CLIENT_ID; client_config.clientid[OPT_LEN] = 7; client_config.clientid[OPT_DATA] = 1; memcpy(client_config.clientid + 3, client_config.arp, 6); } /* changed by lsz 070621 */ client_background(); /* setup the signal pipe */ udhcp_sp_setup(); //if (dhcpc_shm_init() != 0) // return -1; #include "msgq.h" dhcp_ipc_fork(DHCPC); state = INIT_SELECTING; run_script(NULL, "deconfig"); change_mode(LISTEN_RAW); for (;;) { tv.tv_sec = timeout - uptime(); tv.tv_usec = 0; if (listen_mode != LISTEN_NONE && fd < 0) { if (listen_mode == LISTEN_KERNEL) fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface); else fd = raw_socket(client_config.ifindex); if (fd < 0) { LOG(LOG_ERR, "FATAL: couldn't listen on socket, %m"); return 0; } } /* * select don't return when timeout value is larger than 1.5 hours * we just wait multiple times * added by tiger 090819, should fix later */ struct timeval tp_timeout; #define TP_TIMEOUT_MAX (30*60) if (tv.tv_sec > 0) { do { max_fd = udhcp_sp_fd_set(&rfds, fd); tp_timeout.tv_sec = (tv.tv_sec > TP_TIMEOUT_MAX) ? TP_TIMEOUT_MAX : tv.tv_sec; tv.tv_sec -= tp_timeout.tv_sec; tp_timeout.tv_usec = 0; retval = select(max_fd + 1, &rfds, NULL, NULL, &tp_timeout); } while (tv.tv_sec > 0 && retval == 0); } else { retval = 0; /* If we already timed out, fall through */ } now = uptime(); if (retval == 0) { /* timeout dropped to zero */ switch (state) { case INIT_SELECTING: #define DISCOVER_RETRY_TIMES 5 #define DISCOVER_INVERT_TIMES 3 if (packet_num < DISCOVER_RETRY_TIMES) { if (packet_num == 0) { xid = random_xid(); /* use user config dhcp flags when first discover, added by tiger 20090821 */ if (server_unicast) { set_runtime_dhcp_flags(DHCP_FLAGS_UNICAST); } else { set_runtime_dhcp_flags(DHCP_FLAGS_BROADCAST); } } /* change runtime dhcp flags when exceed DISCOVER_INVERT_TIMES added by tiger 20090819 apply 11G and XP's option */ if (DISCOVER_INVERT_TIMES == packet_num) { invert_runtime_dhcp_flags(); } /* send discover packet */ //send_discover(xid, requested_ip, server_unicast); /* broadcast */ /* modified by tiger 20090304, reply mode's setting way changed */ send_discover(xid, requested_ip); msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Send DISCOVER with request ip %X and unicast flag %d", requested_ip, get_runtime_dhcp_flags()); timeout = now + ((packet_num == 2) ? 4 : 2); packet_num++; } else { run_script(NULL, "leasefail"); msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC DHCP Service unavailable, recv no OFFER"); if (client_config.background_if_no_lease) { LOG(LOG_INFO, "No lease, forking to background."); client_background(); } else if (client_config.abort_if_no_lease) { LOG(LOG_INFO, "No lease, failing."); return 1; } /* wait to try again */ packet_num = 0; timeout = now + 10 + (fail_times ++) * 30; /* 60->6000, we dont need to try again -- lsz, 080722 */ /* 6000->30*fail_times -- lsz, 081008 */ } break; case RENEW_REQUESTED: case REQUESTING: if (packet_num < 3) { /* send request packet */ if (state == RENEW_REQUESTED) { send_renew(xid, server_addr, requested_ip); /* unicast */ } else { send_selecting(xid, server_addr, requested_ip); /* broadcast */ } msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Send REQUEST to server %x with request ip %x", server_addr, requested_ip); timeout = now + ((packet_num == 2) ? 10 : 2); packet_num++; } else { /* timed out, go back to init state */ if (state == RENEW_REQUESTED) run_script(NULL, "deconfig"); state = INIT_SELECTING; timeout = now; packet_num = 0; change_mode(LISTEN_RAW); } break; case BOUND: /* Lease is starting to run out, time to enter renewing state */ state = RENEWING; change_mode(LISTEN_KERNEL); DEBUG(LOG_INFO, "Entering renew state"); /* fall right through */ case RENEWING: /* Either set a new T1, or enter REBINDING state */ if ((t2 - t1) <= (lease / 14400 + 1)) { /* timed out, enter rebinding state */ state = REBINDING; timeout = now + (t2 - t1); DEBUG(LOG_INFO, "Entering rebinding state"); } else { /* send a request packet */ send_renew(xid, server_addr, requested_ip); /* unicast */ msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Send REQUEST to server %x with request ip %x", server_addr, requested_ip); t1 = (t2 - t1) / 2 + t1; timeout = t1 + start; } break; case REBINDING: /* Either set a new T2, or enter INIT state */ if ((lease - t2) <= (lease / 14400 + 1)) { /* timed out, enter init state */ state = INIT_SELECTING; LOG(LOG_INFO, "Lease lost, entering init state"); run_script(NULL, "deconfig"); timeout = now; packet_num = 0; change_mode(LISTEN_RAW); } else { /* send a request packet */ send_renew(xid, 0, requested_ip); /* broadcast */ msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Broadcast REQUEST with request ip %x", requested_ip); t2 = (lease - t2) / 2 + t2; timeout = t2 + start; } break; case RELEASED: /* yah, I know, *you* say it would never happen */ timeout = 0x7fffffff; break; } } else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(fd, &rfds)) { /* a packet is ready, read it */ if (listen_mode == LISTEN_KERNEL) len = get_packet(&packet, fd); else len = get_raw_packet(&packet, fd); if (len == -1 && errno != EINTR) { DEBUG(LOG_INFO, "error on read, %m, reopening socket"); change_mode(listen_mode); /* just close and reopen */ } if (len < 0) continue; if (packet.xid != xid) { DEBUG(LOG_INFO, "Ignoring XID %lx (our xid is %lx)", (unsigned long) packet.xid, xid); continue; } /* Ignore packets that aren't for us */ if (memcmp(packet.chaddr, client_config.arp, 6)) { DEBUG(LOG_INFO, "packet does not have our chaddr -- ignoring"); continue; } if ((message = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) { DEBUG(LOG_ERR, "couldnt get option from packet -- ignoring"); continue; } switch (state) { case INIT_SELECTING: /* Must be a DHCPOFFER to one of our xid's */ if (*message == DHCPOFFER) { if ((temp = get_option(&packet, DHCP_SERVER_ID))) { memcpy(&server_addr, temp, 4); xid = packet.xid; requested_ip = packet.yiaddr; msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Recv OFFER from server %x with ip %x", server_addr, requested_ip); /* enter requesting state */ state = REQUESTING; timeout = now; packet_num = 0; } else { DEBUG(LOG_ERR, "No server ID in message"); } } break; case RENEW_REQUESTED: case REQUESTING: case RENEWING: case REBINDING: if (*message == DHCPACK) { if (!(temp = get_option(&packet, DHCP_LEASE_TIME))) { LOG(LOG_ERR, "No lease time with ACK, using 1 hour lease"); lease = 60 * 60; } else { memcpy(&lease, temp, 4); lease = ntohl(lease); } /* RFC 2131 3.1 paragraph 5: * "The client receives the DHCPACK message with configuration * parameters. The client SHOULD perform a final check on the * parameters (e.g., ARP for allocated network address), and notes * the duration of the lease specified in the DHCPACK message. At this * point, the client is configured. If the client detects that the * address is already in use (e.g., through the use of ARP), * the client MUST send a DHCPDECLINE message to the server and restarts * the configuration process..." * added by tiger 20090827 */ if (!arpping(packet.yiaddr, (uint32_t) 0, packet.yiaddr, client_config.arp, client_config.interface) ) { msglogd (LOG_INFO, LOGTYPE_DHCP, "DHCPC: offered address is in use " "(got ARP reply), Send decline"); send_decline(xid, server_addr, packet.yiaddr); if (state != REQUESTING) run_script(NULL, "deconfig"); change_mode(LISTEN_RAW); state = INIT_SELECTING; requested_ip = 0; timeout = now + 12; packet_num = 0; continue; /* back to main loop */ } /* enter bound state */ t1 = lease / 2; /* little fixed point for n * .875 */ t2 = (lease * 0x7) >> 3; temp_addr.s_addr = packet.yiaddr; LOG(LOG_INFO, "Lease of %s obtained, lease time %ld", inet_ntoa(temp_addr), lease); start = now; timeout = t1 + start; requested_ip = packet.yiaddr; if ((temp = get_option(&packet, DHCP_SERVER_ID))) memcpy(&server_addr, temp, 4); msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Recv ACK from server %x with ip %x lease time %ld", server_addr, requested_ip, lease); run_script(&packet, ((state == RENEWING || state == REBINDING) ? "renew" : "bound")); fail_times = 0; /* clear the retry counter */ state = BOUND; change_mode(LISTEN_NONE); if (client_config.quit_after_lease) return 0; if (!client_config.foreground) client_background(); } else if (*message == DHCPNAK) { /* return to init state */ LOG(LOG_INFO, "Received DHCP NAK"); if ((temp = get_option(&packet, DHCP_SERVER_ID))) memcpy(&server_addr, temp, 4); msglogd(LOG_INFO, LOGTYPE_DHCP, "DHCPC Recv NAK from server %x with ip %x", server_addr, requested_ip); run_script(&packet, "nak"); if (state != REQUESTING) run_script(NULL, "deconfig"); state = INIT_SELECTING; timeout = now + 3; /* change by lsz 080905, without this 3 seconds, * the udhcpc will keep on trying and the release * msg cant be recved by udhcpc, even if we are * wan static ip now, the udhcpc is still sending * discover pkts. */ requested_ip = 0; packet_num = 0; change_mode(LISTEN_RAW); //sleep(3); /* avoid excessive network traffic */ } break; /* case BOUND, RELEASED: - ignore all packets */ } } else if (retval > 0 && (sig = udhcp_sp_read(&rfds))) {