void msn_xfer_cancel(PurpleXfer *xfer) { MsnSlpCall *slpcall; char *content; g_return_if_fail(xfer != NULL); g_return_if_fail(xfer->data != NULL); slpcall = xfer->data; if (purple_xfer_get_status(xfer) == PURPLE_XFER_STATUS_CANCEL_LOCAL) { if (slpcall->started) { msn_slp_call_close(slpcall); } else { content = pecan_strdup_printf("SessionID: %lu\r\n\r\n", slpcall->session_id); send_decline(slpcall, slpcall->branch, "application/x-msnmsgr-sessionreqbody", content); g_free(content); msn_slplink_unleash(slpcall->slplink); msn_slp_call_destroy(slpcall); } } }
/* ARGSUSED */ static void rtsock_event(iu_eh_t *ehp, int fd, short events, iu_event_id_t id, void *arg) { struct ifslist *ifs; union { struct ifa_msghdr ifam; char buf[1024]; } msg; uint16_t ifindex; struct lifreq lifr; char *fail; int msglen; DHCPSTATE oldstate; if ((msglen = read(fd, &msg, sizeof (msg))) <= 0) return; /* * These are the messages that can identify a particular logical * interface by local IP address. */ if (msg.ifam.ifam_type != RTM_DELADDR && msg.ifam.ifam_type != RTM_NEWADDR) return; /* Note that ifam_index is just 16 bits */ ifindex = msg.ifam.ifam_index; for (ifs = lookup_ifs_by_uindex(ifindex, NULL); ifs != NULL; ifs = lookup_ifs_by_uindex(ifindex, ifs)) { /* * The if_sock_ip_fd is set to a non-negative integer by * configure_bound(). If it's negative, then DHCP doesn't * think we're bound. * * For pre-bound interfaces, we want to check to see if the * IFF_UP bit has been reported. This means that DAD is * complete. */ oldstate = ifs->if_state; if (ifs->if_sock_ip_fd == -1 && (oldstate != PRE_BOUND && oldstate != ADOPTING)) continue; /* * Since we cannot trust the flags reported by the routing * socket (they're just 32 bits -- and thus never include * IFF_DUPLICATE), and we can't trust the ifindex (it's only 16 * bits and also doesn't reflect the alias in use), we get * flags on all matching interfaces, and go by that. */ (void) strlcpy(lifr.lifr_name, ifs->if_name, sizeof (lifr.lifr_name)); if (ioctl(ifs->if_sock_fd, SIOCGLIFFLAGS, &lifr) == -1) { fail = "unable to retrieve interface flags on %s"; lifr.lifr_flags = 0; } else if (!check_rtm_addr(&msg.ifam, msglen, ifs->if_addr)) { /* * If the message is not about this logical interface, * then just ignore it. */ continue; } else if (lifr.lifr_flags & IFF_DUPLICATE) { fail = "interface %s has duplicate address"; } else { /* * If we're now up and we were waiting for that, then * kick off this interface. DAD is done. */ if (lifr.lifr_flags & IFF_UP) { if (oldstate == PRE_BOUND || oldstate == ADOPTING) dhcp_bound_complete(ifs); if (oldstate == ADOPTING) dhcp_adopt_complete(ifs); } continue; } if (ifs->if_sock_ip_fd != -1) { (void) close(ifs->if_sock_ip_fd); ifs->if_sock_ip_fd = -1; } dhcpmsg(MSG_ERROR, fail, ifs->if_name); /* * The binding has evidently failed, so it's as though it never * happened. We need to do switch back to PRE_BOUND state so * that send_pkt_internal() uses DLPI instead of sockets. Our * logical interface has already been torn down by the kernel, * and thus we can't send DHCPDECLINE by way of regular IP. * (Unless we're adopting -- allow the grandparent to be * handled as expected.) */ if (oldstate != ADOPTING) ifs->if_state = PRE_BOUND; if (ifs->if_ack->opts[CD_DHCP_TYPE] != NULL && (lifr.lifr_flags & IFF_DUPLICATE)) send_decline(ifs, fail, &ifs->if_addr); ifs->if_bad_offers++; dhcp_restart(ifs); } }
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; } /* Start the log, sanitize fd's, and write a pid file */ udhcp_start_log_and_pid(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 = 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; /* When running on a bridge, the ifindex may have changed (e.g. if * member interfaces were added/removed or if the status of the * bridge changed). * Workaround: refresh it here before processing the next packet */ read_interface(client_config.interface, &client_config.ifindex, NULL, client_config.arp); 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); } max_fd = udhcp_sp_fd_set(&rfds, fd); 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 (!client_config.retries || (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"); return 1; } /* wait to try again */ packet_num = 0; timeout = now + 60; } break; case RENEW_REQUESTED: case REQUESTING: if (!client_config.retries || (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(fd, &rfds)) { /* a packet is ready, read it */ if (listen_mode == LISTEN_KERNEL) len = udhcp_get_packet(&packet, fd); else len = get_raw_packet(&packet, fd); 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; } if ((message = get_option(&packet, DHCP_MESSAGE_TYPE)) == 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 */ unsigned int lease_tmp = 0; memcpy(&lease_tmp, temp, 4); lease = ntohl(lease_tmp); } if (!arpping(packet.yiaddr, (uint32_t) 0, client_config.arp, client_config.interface) ) { bb_info_msg("Offered address is in use " "(got ARP reply), declining"); send_decline(xid, server_addr, packet.yiaddr); if (state != REQUESTING) udhcp_run_script(NULL, "deconfig"); change_mode(LISTEN_RAW); state = INIT_SELECTING; requested_ip = 0; timeout = now + 20; 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; 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(); return 0; } 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 { 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))) {
static void request_respond(struct sockaddr *from, int fromlen, int length, int fd) { CARD16 displayNumber; ARRAY16 connectionTypes; ARRAYofARRAY8 connectionAddresses; ARRAY8 authenticationName; ARRAY8 authenticationData; ARRAYofARRAY8 authorizationNames; ARRAY8 manufacturerDisplayID; ARRAY8Ptr reason = 0; int expectlen; int i, j; struct protoDisplay *pdpy; ARRAY8 authorizationName, authorizationData; ARRAY8Ptr connectionAddress; Debug("<request> respond %d\n", length); connectionTypes.data = 0; connectionAddresses.data = 0; authenticationName.data = 0; authenticationData.data = 0; authorizationNames.data = 0; authorizationName.length = 0; authorizationData.length = 0; manufacturerDisplayID.data = 0; if(XdmcpReadCARD16(&buffer, &displayNumber) && XdmcpReadARRAY16(&buffer, &connectionTypes) && XdmcpReadARRAYofARRAY8(&buffer, &connectionAddresses) && XdmcpReadARRAY8(&buffer, &authenticationName) && XdmcpReadARRAY8(&buffer, &authenticationData) && XdmcpReadARRAYofARRAY8(&buffer, &authorizationNames) && XdmcpReadARRAY8(&buffer, &manufacturerDisplayID)) { expectlen = 0; expectlen += 2; /* displayNumber */ expectlen += 1 + 2 * connectionTypes.length; /* connectionTypes */ expectlen += 1; /* connectionAddresses */ for(i = 0; i < (int)connectionAddresses.length; i++) expectlen += 2 + connectionAddresses.data[i].length; expectlen += 2 + authenticationName.length; /* authenticationName */ expectlen += 2 + authenticationData.length; /* authenticationData */ expectlen += 1; /* authoriationNames */ for(i = 0; i < (int)authorizationNames.length; i++) expectlen += 2 + authorizationNames.data[i].length; expectlen += 2 + manufacturerDisplayID.length; /* displayID */ if(expectlen != length) { Debug("<request> length error got %d expect %d\n", length, expectlen); goto abort; } if(connectionTypes.length == 0 || connectionAddresses.length != connectionTypes.length) { reason = &noValidAddr; pdpy = 0; goto decline; } pdpy = FindProtoDisplay((XdmcpNetaddr)from, fromlen, displayNumber); if(!pdpy) { /* Check this Display against the Manager's policy */ reason = Accept(from, fromlen, displayNumber); if(reason) goto decline; /* Check the Display's stream services against Manager's policy */ i = SelectConnectionTypeIndex(&connectionTypes, &connectionAddresses); if(i < 0) { reason = &noValidAddr; goto decline; } /* The Manager considers this a new session */ connectionAddress = &connectionAddresses.data[i]; pdpy = NewProtoDisplay((XdmcpNetaddr)from, fromlen, displayNumber, connectionTypes.data[i], connectionAddress, NextSessionID()); Debug("NewProtoDisplay %p\n", pdpy); if(!pdpy) { reason = &outOfMemory; goto decline; } } if(authorizationNames.length == 0) j = 0; else j = SelectAuthorizationTypeIndex(&authenticationName, &authorizationNames); if(j < 0) { reason = &noValidAuth; goto decline; } if(!CheckAuthentication(pdpy, &manufacturerDisplayID, &authenticationName, &authenticationData)) { reason = &noAuthentic; goto decline; } if(j < (int)authorizationNames.length) { Xauth *auth; SetProtoDisplayAuthorization(pdpy, (unsigned short)authorizationNames.data[j].length, (char *)authorizationNames.data[j].data); auth = pdpy->xdmcpAuthorization; if(!auth) auth = pdpy->fileAuthorization; if(auth) { authorizationName.length = auth->name_length; authorizationName.data = (CARD8Ptr)auth->name; authorizationData.length = auth->data_length; authorizationData.data = (CARD8Ptr)auth->data; } } if(pdpy) { send_accept(from, fromlen, pdpy->sessionID, &authenticationName, &authenticationData, &authorizationName, &authorizationData, fd); } else { decline: send_decline(from, fromlen, &authenticationName, &authenticationData, reason, fd); if(pdpy) DisposeProtoDisplay(pdpy); } } abort: XdmcpDisposeARRAY16(&connectionTypes); XdmcpDisposeARRAYofARRAY8(&connectionAddresses); XdmcpDisposeARRAY8(&authenticationName); XdmcpDisposeARRAY8(&authenticationData); XdmcpDisposeARRAYofARRAY8(&authorizationNames); XdmcpDisposeARRAY8(&manufacturerDisplayID); }