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Diffstat (limited to 'server/dhcpd.c')
| -rw-r--r-- | server/dhcpd.c | 1542 |
1 files changed, 1542 insertions, 0 deletions
diff --git a/server/dhcpd.c b/server/dhcpd.c new file mode 100644 index 0000000..2e5ae80 --- /dev/null +++ b/server/dhcpd.c @@ -0,0 +1,1542 @@ +/* dhcpd.c + + DHCP Server Daemon. */ + +/* + * Copyright (c) 2004-2015 by Internet Systems Consortium, Inc. ("ISC") + * Copyright (c) 1996-2003 by Internet Software Consortium + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT + * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * Internet Systems Consortium, Inc. + * 950 Charter Street + * Redwood City, CA 94063 + * <info@isc.org> + * https://www.isc.org/ + * + */ + +static const char copyright[] = +"Copyright 2004-2015 Internet Systems Consortium."; +static const char arr [] = "All rights reserved."; +static const char message [] = "Internet Systems Consortium DHCP Server"; +static const char url [] = +"For info, please visit https://www.isc.org/software/dhcp/"; + +#include "dhcpd.h" +#include <omapip/omapip_p.h> +#include <syslog.h> +#include <signal.h> +#include <errno.h> +#include <limits.h> +#include <sys/types.h> +#include <sys/time.h> + +#if defined (PARANOIA) +# include <sys/types.h> +# include <unistd.h> +# include <pwd.h> +/* get around the ISC declaration of group */ +# define group real_group +# include <grp.h> +# undef group +#endif /* PARANOIA */ + +#ifndef UNIT_TEST +static void usage(void); +#endif + +struct iaddr server_identifier; +int server_identifier_matched; + +#if defined (NSUPDATE) + +/* This stuff is always executed to figure the default values for certain + ddns variables. */ +char std_nsupdate [] = " \n\ +option server.ddns-hostname = \n\ + pick (option fqdn.hostname, option host-name, config-option host-name); \n\ +option server.ddns-domainname = config-option domain-name; \n\ +option server.ddns-rev-domainname = \"in-addr.arpa.\";"; + +/* This is the old-style name service updater that is executed + whenever a lease is committed. It does not follow the DHCP-DNS + draft at all. */ + +char old_nsupdate [] = " \n\ +on commit { \n\ + if (not static and \n\ + ((config-option server.ddns-updates = null) or \n\ + (config-option server.ddns-updates != 0))) { \n\ + set new-ddns-fwd-name = \n\ + concat (pick (config-option server.ddns-hostname, \n\ + option host-name), \".\", \n\ + pick (config-option server.ddns-domainname, \n\ + config-option domain-name)); \n\ + if (defined (ddns-fwd-name) and ddns-fwd-name != new-ddns-fwd-name) { \n\ + switch (ns-update (delete (IN, A, ddns-fwd-name, leased-address))) { \n\ + case NOERROR: \n\ + unset ddns-fwd-name; \n\ + on expiry or release { \n\ + } \n\ + } \n\ + } \n\ + \n\ + if (not defined (ddns-fwd-name)) { \n\ + set ddns-fwd-name = new-ddns-fwd-name; \n\ + if defined (ddns-fwd-name) { \n\ + switch (ns-update (not exists (IN, A, ddns-fwd-name, null), \n\ + add (IN, A, ddns-fwd-name, leased-address, \n\ + lease-time / 2))) { \n\ + default: \n\ + unset ddns-fwd-name; \n\ + break; \n\ + \n\ + case NOERROR: \n\ + set ddns-rev-name = \n\ + concat (binary-to-ascii (10, 8, \".\", \n\ + reverse (1, \n\ + leased-address)), \".\", \n\ + pick (config-option server.ddns-rev-domainname, \n\ + \"in-addr.arpa.\")); \n\ + switch (ns-update (delete (IN, PTR, ddns-rev-name, null), \n\ + add (IN, PTR, ddns-rev-name, ddns-fwd-name, \n\ + lease-time / 2))) \n\ + { \n\ + default: \n\ + unset ddns-rev-name; \n\ + on release or expiry { \n\ + switch (ns-update (delete (IN, A, ddns-fwd-name, \n\ + leased-address))) { \n\ + case NOERROR: \n\ + unset ddns-fwd-name; \n\ + break; \n\ + } \n\ + on release or expiry; \n\ + } \n\ + break; \n\ + \n\ + case NOERROR: \n\ + on release or expiry { \n\ + switch (ns-update (delete (IN, PTR, ddns-rev-name, null))) {\n\ + case NOERROR: \n\ + unset ddns-rev-name; \n\ + break; \n\ + } \n\ + switch (ns-update (delete (IN, A, ddns-fwd-name, \n\ + leased-address))) { \n\ + case NOERROR: \n\ + unset ddns-fwd-name; \n\ + break; \n\ + } \n\ + on release or expiry; \n\ + } \n\ + } \n\ + } \n\ + } \n\ + } \n\ + unset new-ddns-fwd-name; \n\ + } \n\ +}"; + +#endif /* NSUPDATE */ +int ddns_update_style; + +const char *path_dhcpd_conf = _PATH_DHCPD_CONF; +const char *path_dhcpd_db = _PATH_DHCPD_DB; +const char *path_dhcpd_pid = _PATH_DHCPD_PID; +/* False (default) => we write and use a pid file */ +isc_boolean_t no_pid_file = ISC_FALSE; + +int dhcp_max_agent_option_packet_length = DHCP_MTU_MAX; + +static omapi_auth_key_t *omapi_key = (omapi_auth_key_t *)0; +int omapi_port; + +#if defined (TRACING) +trace_type_t *trace_srandom; +#endif + +static isc_result_t verify_addr (omapi_object_t *l, omapi_addr_t *addr) { + return ISC_R_SUCCESS; +} + +static isc_result_t verify_auth (omapi_object_t *p, omapi_auth_key_t *a) { + if (a != omapi_key) + return DHCP_R_INVALIDKEY; + return ISC_R_SUCCESS; +} + +static void omapi_listener_start (void *foo) +{ + omapi_object_t *listener; + isc_result_t result; + struct timeval tv; + + listener = (omapi_object_t *)0; + result = omapi_generic_new (&listener, MDL); + if (result != ISC_R_SUCCESS) + log_fatal ("Can't allocate new generic object: %s", + isc_result_totext (result)); + result = omapi_protocol_listen (listener, + (unsigned)omapi_port, 1); + if (result == ISC_R_SUCCESS && omapi_key) + result = omapi_protocol_configure_security + (listener, verify_addr, verify_auth); + if (result != ISC_R_SUCCESS) { + log_error ("Can't start OMAPI protocol: %s", + isc_result_totext (result)); + tv.tv_sec = cur_tv.tv_sec + 5; + tv.tv_usec = cur_tv.tv_usec; + add_timeout (&tv, omapi_listener_start, 0, 0, 0); + } + omapi_object_dereference (&listener, MDL); +} + +#if defined (PARANOIA) +/* to be used in one of two possible scenarios */ +static void setup_chroot (char *chroot_dir) { + if (geteuid()) + log_fatal ("you must be root to use chroot"); + + if (chroot(chroot_dir)) { + log_fatal ("chroot(\"%s\"): %m", chroot_dir); + } + if (chdir ("/")) { + /* probably permission denied */ + log_fatal ("chdir(\"/\"): %m"); + } +} +#endif /* PARANOIA */ + +#ifndef UNIT_TEST +int +main(int argc, char **argv) { + int fd; + int i, status; + struct servent *ent; + char *s; + int cftest = 0; + int lftest = 0; + int pid; + char pbuf [20]; +#ifndef DEBUG + int daemon = 1; +#endif + int quiet = 0; + char *server = (char *)0; + isc_result_t result; + unsigned seed; + struct interface_info *ip; +#if defined (NSUPDATE) + struct parse *parse; + int lose; +#endif + int no_dhcpd_conf = 0; + int no_dhcpd_db = 0; + int no_dhcpd_pid = 0; +#ifdef DHCPv6 + int local_family_set = 0; +#endif /* DHCPv6 */ +#if defined (TRACING) + char *traceinfile = (char *)0; + char *traceoutfile = (char *)0; +#endif + +#if defined (PARANOIA) + char *set_user = 0; + char *set_group = 0; + char *set_chroot = 0; + + uid_t set_uid = 0; + gid_t set_gid = 0; +#endif /* PARANOIA */ + + /* Make sure that file descriptors 0 (stdin), 1, (stdout), and + 2 (stderr) are open. To do this, we assume that when we + open a file the lowest available file descriptor is used. */ + fd = open("/dev/null", O_RDWR); + if (fd == 0) + fd = open("/dev/null", O_RDWR); + if (fd == 1) + fd = open("/dev/null", O_RDWR); + if (fd == 2) + log_perror = 0; /* No sense logging to /dev/null. */ + else if (fd != -1) + close(fd); + + /* Set up the isc and dns library managers */ + status = dhcp_context_create(); + if (status != ISC_R_SUCCESS) + log_fatal("Can't initialize context: %s", + isc_result_totext(status)); + + /* Set up the client classification system. */ + classification_setup (); + + /* Initialize the omapi system. */ + result = omapi_init (); + if (result != ISC_R_SUCCESS) + log_fatal ("Can't initialize OMAPI: %s", + isc_result_totext (result)); + + /* Set up the OMAPI wrappers for common objects. */ + dhcp_db_objects_setup (); + /* Set up the OMAPI wrappers for various server database internal + objects. */ + dhcp_common_objects_setup (); + + /* Initially, log errors to stderr as well as to syslogd. */ + openlog ("dhcpd", DHCP_LOG_OPTIONS, DHCPD_LOG_FACILITY); + + for (i = 1; i < argc; i++) { + if (!strcmp (argv [i], "-p")) { + if (++i == argc) + usage (); + local_port = validate_port (argv [i]); + log_debug ("binding to user-specified port %d", + ntohs (local_port)); + } else if (!strcmp (argv [i], "-f")) { +#ifndef DEBUG + daemon = 0; +#endif + } else if (!strcmp (argv [i], "-d")) { +#ifndef DEBUG + daemon = 0; +#endif + log_perror = -1; + } else if (!strcmp (argv [i], "-s")) { + if (++i == argc) + usage (); + server = argv [i]; +#if defined (PARANOIA) + } else if (!strcmp (argv [i], "-user")) { + if (++i == argc) + usage (); + set_user = argv [i]; + } else if (!strcmp (argv [i], "-group")) { + if (++i == argc) + usage (); + set_group = argv [i]; + } else if (!strcmp (argv [i], "-chroot")) { + if (++i == argc) + usage (); + set_chroot = argv [i]; +#endif /* PARANOIA */ + } else if (!strcmp (argv [i], "-cf")) { + if (++i == argc) + usage (); + path_dhcpd_conf = argv [i]; + no_dhcpd_conf = 1; + } else if (!strcmp (argv [i], "-lf")) { + if (++i == argc) + usage (); + path_dhcpd_db = argv [i]; + no_dhcpd_db = 1; + } else if (!strcmp (argv [i], "-pf")) { + if (++i == argc) + usage (); + path_dhcpd_pid = argv [i]; + no_dhcpd_pid = 1; + } else if (!strcmp(argv[i], "--no-pid")) { + no_pid_file = ISC_TRUE; + } else if (!strcmp (argv [i], "-t")) { + /* test configurations only */ +#ifndef DEBUG + daemon = 0; +#endif + cftest = 1; + log_perror = -1; + } else if (!strcmp (argv [i], "-T")) { + /* test configurations and lease file only */ +#ifndef DEBUG + daemon = 0; +#endif + cftest = 1; + lftest = 1; + log_perror = -1; + } else if (!strcmp (argv [i], "-q")) { + quiet = 1; + quiet_interface_discovery = 1; +#ifdef DHCPv6 + } else if (!strcmp(argv[i], "-4")) { + if (local_family_set && (local_family != AF_INET)) { + log_fatal("Server cannot run in both IPv4 and " + "IPv6 mode at the same time."); + } + local_family = AF_INET; + local_family_set = 1; + } else if (!strcmp(argv[i], "-6")) { + if (local_family_set && (local_family != AF_INET6)) { + log_fatal("Server cannot run in both IPv4 and " + "IPv6 mode at the same time."); + } + local_family = AF_INET6; + local_family_set = 1; +#endif /* DHCPv6 */ + } else if (!strcmp (argv [i], "--version")) { + log_info("isc-dhcpd-%s", PACKAGE_VERSION); + exit (0); +#if defined (TRACING) + } else if (!strcmp (argv [i], "-tf")) { + if (++i == argc) + usage (); + traceoutfile = argv [i]; + } else if (!strcmp (argv [i], "-play")) { + if (++i == argc) + usage (); + traceinfile = argv [i]; + trace_replay_init (); +#endif /* TRACING */ + } else if (argv [i][0] == '-') { + usage (); + } else { + struct interface_info *tmp = + (struct interface_info *)0; + if (strlen(argv[i]) >= sizeof(tmp->name)) + log_fatal("%s: interface name too long " + "(is %ld)", + argv[i], (long)strlen(argv[i])); + result = interface_allocate (&tmp, MDL); + if (result != ISC_R_SUCCESS) + log_fatal ("Insufficient memory to %s %s: %s", + "record interface", argv [i], + isc_result_totext (result)); + strcpy (tmp -> name, argv [i]); + if (interfaces) { + interface_reference (&tmp -> next, + interfaces, MDL); + interface_dereference (&interfaces, MDL); + } + interface_reference (&interfaces, tmp, MDL); + tmp -> flags = INTERFACE_REQUESTED; + } + } + + if (!no_dhcpd_conf && (s = getenv ("PATH_DHCPD_CONF"))) { + path_dhcpd_conf = s; + } + +#ifdef DHCPv6 + if (local_family == AF_INET6) { + /* DHCPv6: override DHCPv4 lease and pid filenames */ + if (!no_dhcpd_db) { + if ((s = getenv ("PATH_DHCPD6_DB"))) + path_dhcpd_db = s; + else + path_dhcpd_db = _PATH_DHCPD6_DB; + } + if (!no_dhcpd_pid) { + if ((s = getenv ("PATH_DHCPD6_PID"))) + path_dhcpd_pid = s; + else + path_dhcpd_pid = _PATH_DHCPD6_PID; + } + } else +#else /* !DHCPv6 */ + { + if (!no_dhcpd_db && (s = getenv ("PATH_DHCPD_DB"))) { + path_dhcpd_db = s; + } + if (!no_dhcpd_pid && (s = getenv ("PATH_DHCPD_PID"))) { + path_dhcpd_pid = s; + } + } +#endif /* DHCPv6 */ + + /* + * convert relative path names to absolute, for files that need + * to be reopened after chdir() has been called + */ + if (path_dhcpd_db[0] != '/') { + char *path = dmalloc(PATH_MAX, MDL); + if (path == NULL) + log_fatal("No memory for filename\n"); + path_dhcpd_db = realpath(path_dhcpd_db, path); + if (path_dhcpd_db == NULL) + log_fatal("%s: %s", path, strerror(errno)); + } + + if (!quiet) { + log_info("%s %s", message, PACKAGE_VERSION); + log_info (copyright); + log_info (arr); + log_info (url); + } else { + quiet = 0; + log_perror = 0; + } + +#if defined (TRACING) + trace_init (set_time, MDL); + if (traceoutfile) { + result = trace_begin (traceoutfile, MDL); + if (result != ISC_R_SUCCESS) + log_fatal ("Unable to begin trace: %s", + isc_result_totext (result)); + } + interface_trace_setup (); + parse_trace_setup (); + trace_srandom = trace_type_register ("random-seed", (void *)0, + trace_seed_input, + trace_seed_stop, MDL); +#if defined (NSUPDATE) + trace_ddns_init(); +#endif /* NSUPDATE */ +#endif + +#if defined (PARANOIA) + /* get user and group info if those options were given */ + if (set_user) { + struct passwd *tmp_pwd; + + if (geteuid()) + log_fatal ("you must be root to set user"); + + if (!(tmp_pwd = getpwnam(set_user))) + log_fatal ("no such user: %s", set_user); + + set_uid = tmp_pwd->pw_uid; + + /* use the user's group as the default gid */ + if (!set_group) + set_gid = tmp_pwd->pw_gid; + } + + if (set_group) { +/* get around the ISC declaration of group */ +#define group real_group + struct group *tmp_grp; + + if (geteuid()) + log_fatal ("you must be root to set group"); + + if (!(tmp_grp = getgrnam(set_group))) + log_fatal ("no such group: %s", set_group); + + set_gid = tmp_grp->gr_gid; +#undef group + } + +# if defined (EARLY_CHROOT) + if (set_chroot) setup_chroot (set_chroot); +# endif /* EARLY_CHROOT */ +#endif /* PARANOIA */ + + /* Default to the DHCP/BOOTP port. */ + if (!local_port) + { + if ((s = getenv ("DHCPD_PORT"))) { + local_port = validate_port (s); + log_debug ("binding to environment-specified port %d", + ntohs (local_port)); + } else { + if (local_family == AF_INET) { + ent = getservbyname("dhcp", "udp"); + if (ent == NULL) { + local_port = htons(67); + } else { + local_port = ent->s_port; + } + } else { + /* INSIST(local_family == AF_INET6); */ + ent = getservbyname("dhcpv6-server", "udp"); + if (ent == NULL) { + local_port = htons(547); + } else { + local_port = ent->s_port; + } + } +#ifndef __CYGWIN32__ /* XXX */ + endservent (); +#endif + } + } + + if (local_family == AF_INET) { + remote_port = htons(ntohs(local_port) + 1); + } else { + /* INSIST(local_family == AF_INET6); */ + ent = getservbyname("dhcpv6-client", "udp"); + if (ent == NULL) { + remote_port = htons(546); + } else { + remote_port = ent->s_port; + } + } + + if (server) { + if (local_family != AF_INET) { + log_fatal("You can only specify address to send " + "replies to when running an IPv4 server."); + } + if (!inet_aton (server, &limited_broadcast)) { + struct hostent *he; + he = gethostbyname (server); + if (he) { + memcpy (&limited_broadcast, + he -> h_addr_list [0], + sizeof limited_broadcast); + } else + limited_broadcast.s_addr = INADDR_BROADCAST; + } + } else { + limited_broadcast.s_addr = INADDR_BROADCAST; + } + + /* Get the current time... */ + gettimeofday(&cur_tv, NULL); + + /* Set up the initial dhcp option universe. */ + initialize_common_option_spaces (); + initialize_server_option_spaces (); + + /* Add the ddns update style enumeration prior to parsing. */ + add_enumeration (&ddns_styles); + add_enumeration (&syslog_enum); +#if defined (LDAP_CONFIGURATION) + add_enumeration (&ldap_methods); +#if defined (LDAP_USE_SSL) + add_enumeration (&ldap_ssl_usage_enum); + add_enumeration (&ldap_tls_reqcert_enum); + add_enumeration (&ldap_tls_crlcheck_enum); +#endif +#endif + + if (!group_allocate (&root_group, MDL)) + log_fatal ("Can't allocate root group!"); + root_group -> authoritative = 0; + + /* Set up various hooks. */ + dhcp_interface_setup_hook = dhcpd_interface_setup_hook; + bootp_packet_handler = do_packet; +#ifdef DHCPv6 + dhcpv6_packet_handler = do_packet6; +#endif /* DHCPv6 */ + +#if defined (NSUPDATE) + /* Set up the standard name service updater routine. */ + parse = NULL; + status = new_parse(&parse, -1, std_nsupdate, sizeof(std_nsupdate) - 1, + "standard name service update routine", 0); + if (status != ISC_R_SUCCESS) + log_fatal ("can't begin parsing name service updater!"); + + if (parse != NULL) { + lose = 0; + if (!(parse_executable_statements(&root_group->statements, + parse, &lose, context_any))) { + end_parse(&parse); + log_fatal("can't parse standard name service updater!"); + } + end_parse(&parse); + } +#endif + + /* Initialize icmp support... */ + if (!cftest && !lftest) + icmp_startup (1, lease_pinged); + +#if defined (TRACING) + if (traceinfile) { + if (!no_dhcpd_db) { + log_error ("%s", ""); + log_error ("** You must specify a lease file with -lf."); + log_error (" Dhcpd will not overwrite your default"); + log_fatal (" lease file when playing back a trace. **"); + } + trace_file_replay (traceinfile); + +#if defined (DEBUG_MEMORY_LEAKAGE) && \ + defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT) + free_everything (); + omapi_print_dmalloc_usage_by_caller (); +#endif + + exit (0); + } +#endif + +#ifdef DHCPv6 + /* set up DHCPv6 hashes */ + if (!ia_new_hash(&ia_na_active, DEFAULT_HASH_SIZE, MDL)) { + log_fatal("Out of memory creating hash for active IA_NA."); + } + if (!ia_new_hash(&ia_ta_active, DEFAULT_HASH_SIZE, MDL)) { + log_fatal("Out of memory creating hash for active IA_TA."); + } + if (!ia_new_hash(&ia_pd_active, DEFAULT_HASH_SIZE, MDL)) { + log_fatal("Out of memory creating hash for active IA_PD."); + } +#endif /* DHCPv6 */ + + /* Read the dhcpd.conf file... */ + if (readconf () != ISC_R_SUCCESS) + log_fatal ("Configuration file errors encountered -- exiting"); + + postconf_initialization (quiet); + +#if defined (PARANOIA) && !defined (EARLY_CHROOT) + if (set_chroot) setup_chroot (set_chroot); +#endif /* PARANOIA && !EARLY_CHROOT */ + + /* test option should cause an early exit */ + if (cftest && !lftest) + exit(0); + + /* + * First part of dealing with pid files. Check to see if + * we should continue running or not. We run if: + * - we are testing the lease file out + * - we don't have a pid file to check + * - there is no other process running + */ + if ((lftest == 0) && (no_pid_file == ISC_FALSE)) { + /*Read previous pid file. */ + if ((i = open(path_dhcpd_pid, O_RDONLY)) >= 0) { + status = read(i, pbuf, (sizeof pbuf) - 1); + close(i); + if (status > 0) { + pbuf[status] = 0; + pid = atoi(pbuf); + + /* + * If there was a previous server process and + * it is still running, abort + */ + if (!pid || + (pid != getpid() && kill(pid, 0) == 0)) + log_fatal("There's already a " + "DHCP server running."); + } + } + } + + group_write_hook = group_writer; + + /* Start up the database... */ + db_startup (lftest); + + if (lftest) + exit (0); + + /* Discover all the network interfaces and initialize them. */ + discover_interfaces(DISCOVER_SERVER); + +#ifdef DHCPv6 + /* + * Remove addresses from our pools that we should not issue + * to clients. + * + * We currently have no support for this in IPv4. It is not + * as important in IPv4, as making pools with ranges that + * leave out interfaces and hosts is fairly straightforward + * using range notation, but not so handy with CIDR notation. + */ + if (local_family == AF_INET6) { + mark_hosts_unavailable(); + mark_phosts_unavailable(); + mark_interfaces_unavailable(); + } +#endif /* DHCPv6 */ + + + /* Make up a seed for the random number generator from current + time plus the sum of the last four bytes of each + interface's hardware address interpreted as an integer. + Not much entropy, but we're booting, so we're not likely to + find anything better. */ + seed = 0; + for (ip = interfaces; ip; ip = ip -> next) { + int junk; + memcpy (&junk, + &ip -> hw_address.hbuf [ip -> hw_address.hlen - + sizeof seed], sizeof seed); + seed += junk; + } + srandom (seed + cur_time); +#if defined (TRACING) + trace_seed_stash (trace_srandom, seed + cur_time); +#endif + postdb_startup (); + +#ifdef DHCPv6 + /* + * Set server DHCPv6 identifier. + * See dhcpv6.c for discussion of setting DUID. + */ + if (set_server_duid_from_option() == ISC_R_SUCCESS) { + write_server_duid(); + } else { + if (!server_duid_isset()) { + if (generate_new_server_duid() != ISC_R_SUCCESS) { + log_fatal("Unable to set server identifier."); + } + write_server_duid(); + } + } +#endif /* DHCPv6 */ + +#ifndef DEBUG + if (daemon) { + /* First part of becoming a daemon... */ + if ((pid = fork ()) < 0) + log_fatal ("Can't fork daemon: %m"); + else if (pid) + exit (0); + } + +#if defined (PARANOIA) + /* change uid to the specified one */ + + if (set_gid) { + if (setgroups (0, (void *)0)) + log_fatal ("setgroups: %m"); + if (setgid (set_gid)) + log_fatal ("setgid(%d): %m", (int) set_gid); + } + + if (set_uid) { + if (setuid (set_uid)) + log_fatal ("setuid(%d): %m", (int) set_uid); + } +#endif /* PARANOIA */ + + /* + * Second part of dealing with pid files. Now + * that we have forked we can write our pid if + * appropriate. + */ + if (no_pid_file == ISC_FALSE) { + i = open(path_dhcpd_pid, O_WRONLY|O_CREAT|O_TRUNC, 0644); + if (i >= 0) { + sprintf(pbuf, "%d\n", (int) getpid()); + IGNORE_RET(write(i, pbuf, strlen(pbuf))); + close(i); + } else { + log_error("Can't create PID file %s: %m.", + path_dhcpd_pid); + } + } + + /* If we were requested to log to stdout on the command line, + keep doing so; otherwise, stop. */ + if (log_perror == -1) + log_perror = 1; + else + log_perror = 0; + + if (daemon) { + /* Become session leader and get pid... */ + (void) setsid(); + + /* Close standard I/O descriptors. */ + (void) close(0); + (void) close(1); + (void) close(2); + + /* Reopen them on /dev/null. */ + (void) open("/dev/null", O_RDWR); + (void) open("/dev/null", O_RDWR); + (void) open("/dev/null", O_RDWR); + log_perror = 0; /* No sense logging to /dev/null. */ + + IGNORE_RET (chdir("/")); + } +#endif /* !DEBUG */ + +#if defined (DEBUG_MEMORY_LEAKAGE) || defined (DEBUG_MALLOC_POOL) || \ + defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT) + dmalloc_cutoff_generation = dmalloc_generation; + dmalloc_longterm = dmalloc_outstanding; + dmalloc_outstanding = 0; +#endif + + omapi_set_int_value ((omapi_object_t *)dhcp_control_object, + (omapi_object_t *)0, "state", server_running); + +#if defined(ENABLE_GENTLE_SHUTDOWN) + /* no signal handlers until we deal with the side effects */ + /* install signal handlers */ + signal(SIGINT, dhcp_signal_handler); /* control-c */ + signal(SIGTERM, dhcp_signal_handler); /* kill */ +#endif + + /* + * Receive packets and dispatch them... + * dispatch() will never return. + */ + dispatch (); + + /* Let's return status code */ + return 0; +} +#endif /* !UNIT_TEST */ + +void postconf_initialization (int quiet) +{ + struct option_state *options = (struct option_state *)0; + struct data_string db; + struct option_cache *oc; + char *s; + isc_result_t result; +#if defined (NSUPDATE) + struct parse *parse; +#endif + int tmp; + + /* Now try to get the lease file name. */ + option_state_allocate (&options, MDL); + + execute_statements_in_scope ((struct binding_value **)0, + (struct packet *)0, + (struct lease *)0, + (struct client_state *)0, + (struct option_state *)0, + options, &global_scope, + root_group, + (struct group *)0); + memset (&db, 0, sizeof db); + oc = lookup_option (&server_universe, options, SV_LEASE_FILE_NAME); + if (oc && + evaluate_option_cache (&db, (struct packet *)0, + (struct lease *)0, (struct client_state *)0, + options, (struct option_state *)0, + &global_scope, oc, MDL)) { + s = dmalloc (db.len + 1, MDL); + if (!s) + log_fatal ("no memory for lease db filename."); + memcpy (s, db.data, db.len); + s [db.len] = 0; + data_string_forget (&db, MDL); + path_dhcpd_db = s; + } + + oc = lookup_option (&server_universe, options, SV_PID_FILE_NAME); + if (oc && + evaluate_option_cache (&db, (struct packet *)0, + (struct lease *)0, (struct client_state *)0, + options, (struct option_state *)0, + &global_scope, oc, MDL)) { + s = dmalloc (db.len + 1, MDL); + if (!s) + log_fatal ("no memory for pid filename."); + memcpy (s, db.data, db.len); + s [db.len] = 0; + data_string_forget (&db, MDL); + path_dhcpd_pid = s; + } + +#ifdef DHCPv6 + if (local_family == AF_INET6) { + /* + * Override lease file name with dhcpv6 lease file name, + * if it was set; then, do the same with the pid file name + */ + oc = lookup_option(&server_universe, options, + SV_DHCPV6_LEASE_FILE_NAME); + if (oc && + evaluate_option_cache(&db, NULL, NULL, NULL, + options, NULL, &global_scope, + oc, MDL)) { + s = dmalloc (db.len + 1, MDL); + if (!s) + log_fatal ("no memory for lease db filename."); + memcpy (s, db.data, db.len); + s [db.len] = 0; + data_string_forget (&db, MDL); + path_dhcpd_db = s; + } + + oc = lookup_option(&server_universe, options, + SV_DHCPV6_PID_FILE_NAME); + if (oc && + evaluate_option_cache(&db, NULL, NULL, NULL, + options, NULL, &global_scope, + oc, MDL)) { + s = dmalloc (db.len + 1, MDL); + if (!s) + log_fatal ("no memory for pid filename."); + memcpy (s, db.data, db.len); + s [db.len] = 0; + data_string_forget (&db, MDL); + path_dhcpd_pid = s; + } + } +#endif /* DHCPv6 */ + + omapi_port = -1; + oc = lookup_option (&server_universe, options, SV_OMAPI_PORT); + if (oc && + evaluate_option_cache (&db, (struct packet *)0, + (struct lease *)0, (struct client_state *)0, + options, (struct option_state *)0, + &global_scope, oc, MDL)) { + if (db.len == 2) { + omapi_port = getUShort (db.data); + } else + log_fatal ("invalid omapi port data length"); + data_string_forget (&db, MDL); + } + + oc = lookup_option (&server_universe, options, SV_OMAPI_KEY); + if (oc && + evaluate_option_cache (&db, (struct packet *)0, + (struct lease *)0, (struct client_state *)0, + options, + (struct option_state *)0, + &global_scope, oc, MDL)) { + s = dmalloc (db.len + 1, MDL); + if (!s) + log_fatal ("no memory for OMAPI key filename."); + memcpy (s, db.data, db.len); + s [db.len] = 0; + data_string_forget (&db, MDL); + result = omapi_auth_key_lookup_name (&omapi_key, s); + dfree (s, MDL); + if (result != ISC_R_SUCCESS) + log_fatal ("OMAPI key %s: %s", + s, isc_result_totext (result)); + } + + oc = lookup_option (&server_universe, options, SV_LOCAL_PORT); + if (oc && + evaluate_option_cache (&db, (struct packet *)0, + (struct lease *)0, (struct client_state *)0, + options, + (struct option_state *)0, + &global_scope, oc, MDL)) { + if (db.len == 2) { + local_port = htons (getUShort (db.data)); + } else + log_fatal ("invalid local port data length"); + data_string_forget (&db, MDL); + } + + oc = lookup_option (&server_universe, options, SV_REMOTE_PORT); + if (oc && + evaluate_option_cache (&db, (struct packet *)0, + (struct lease *)0, (struct client_state *)0, + options, (struct option_state *)0, + &global_scope, oc, MDL)) { + if (db.len == 2) { + remote_port = htons (getUShort (db.data)); + } else + log_fatal ("invalid remote port data length"); + data_string_forget (&db, MDL); + } + + oc = lookup_option (&server_universe, options, + SV_LIMITED_BROADCAST_ADDRESS); + if (oc && + evaluate_option_cache (&db, (struct packet *)0, + (struct lease *)0, (struct client_state *)0, + options, (struct option_state *)0, + &global_scope, oc, MDL)) { + if (db.len == 4) { + memcpy (&limited_broadcast, db.data, 4); + } else + log_fatal ("invalid broadcast address data length"); + data_string_forget (&db, MDL); + } + + oc = lookup_option (&server_universe, options, + SV_LOCAL_ADDRESS); + if (oc && + evaluate_option_cache (&db, (struct packet *)0, + (struct lease *)0, (struct client_state *)0, + options, (struct option_state *)0, + &global_scope, oc, MDL)) { + if (db.len == 4) { + memcpy (&local_address, db.data, 4); + } else + log_fatal ("invalid local address data length"); + data_string_forget (&db, MDL); + } + + oc = lookup_option (&server_universe, options, SV_DDNS_UPDATE_STYLE); + if (oc) { + if (evaluate_option_cache (&db, (struct packet *)0, + (struct lease *)0, + (struct client_state *)0, + options, + (struct option_state *)0, + &global_scope, oc, MDL)) { + if (db.len == 1) { + ddns_update_style = db.data [0]; + } else + log_fatal ("invalid dns update type"); + data_string_forget (&db, MDL); + } + } else { + ddns_update_style = DDNS_UPDATE_STYLE_NONE; + } +#if defined (NSUPDATE) + /* We no longer support ad_hoc, tell the user */ + if (ddns_update_style == DDNS_UPDATE_STYLE_AD_HOC) { + log_fatal("ddns-update-style ad_hoc no longer supported"); + } +#else + /* If we don't have support for updates compiled in tell the user */ + if (ddns_update_style != DDNS_UPDATE_STYLE_NONE) { + log_fatal("Support for ddns-update-style not compiled in"); + } +#endif + + oc = lookup_option (&server_universe, options, SV_LOG_FACILITY); + if (oc) { + if (evaluate_option_cache (&db, (struct packet *)0, + (struct lease *)0, + (struct client_state *)0, + options, + (struct option_state *)0, + &global_scope, oc, MDL)) { + if (db.len == 1) { + closelog (); + openlog("dhcpd", DHCP_LOG_OPTIONS, db.data[0]); + /* Log the startup banner into the new + log file. */ + if (!quiet) { + /* Don't log to stderr twice. */ + tmp = log_perror; + log_perror = 0; + log_info("%s %s", + message, PACKAGE_VERSION); + log_info (copyright); + log_info (arr); + log_info (url); + log_perror = tmp; + } + } else + log_fatal ("invalid log facility"); + data_string_forget (&db, MDL); + } + } + + oc = lookup_option(&server_universe, options, SV_DELAYED_ACK); + if (oc && + evaluate_option_cache(&db, NULL, NULL, NULL, options, NULL, + &global_scope, oc, MDL)) { + if (db.len == 2) { + max_outstanding_acks = htons(getUShort(db.data)); + } else { + log_fatal("invalid max delayed ACK count "); + } + data_string_forget(&db, MDL); + } + + oc = lookup_option(&server_universe, options, SV_MAX_ACK_DELAY); + if (oc && + evaluate_option_cache(&db, NULL, NULL, NULL, options, NULL, + &global_scope, oc, MDL)) { + u_int32_t timeval; + + if (db.len != 4) + log_fatal("invalid max ack delay configuration"); + + timeval = getULong(db.data); + max_ack_delay_secs = timeval / 1000000; + max_ack_delay_usecs = timeval % 1000000; + + data_string_forget(&db, MDL); + } + + /* Don't need the options anymore. */ + option_state_dereference (&options, MDL); + +#if defined (NSUPDATE) + /* If old-style ddns updates have been requested, parse the + old-style ddns updater. */ + if (ddns_update_style == 1) { + struct executable_statement **e, *s; + + if (root_group -> statements) { + s = (struct executable_statement *)0; + if (!executable_statement_allocate (&s, MDL)) + log_fatal ("no memory for ddns updater"); + executable_statement_reference + (&s -> next, root_group -> statements, MDL); + executable_statement_dereference + (&root_group -> statements, MDL); + executable_statement_reference + (&root_group -> statements, s, MDL); + s -> op = statements_statement; + e = &s -> data.statements; + executable_statement_dereference (&s, MDL); + } else { + e = &root_group -> statements; + } + + /* Set up the standard name service updater routine. */ + parse = NULL; + result = new_parse(&parse, -1, old_nsupdate, + sizeof(old_nsupdate) - 1, + "old name service update routine", 0); + if (result != ISC_R_SUCCESS) + log_fatal ("can't begin parsing old ddns updater!"); + + if (parse != NULL) { + tmp = 0; + if (!(parse_executable_statements(e, parse, &tmp, + context_any))) { + end_parse(&parse); + log_fatal("can't parse standard ddns updater!"); + } + } + end_parse(&parse); + } +#endif +} + +void postdb_startup (void) +{ + /* Initialize the omapi listener state. */ + if (omapi_port != -1) { + omapi_listener_start (0); + } + +#if defined (FAILOVER_PROTOCOL) + /* Initialize the failover listener state. */ + dhcp_failover_startup (); +#endif + + /* + * Begin our lease timeout background task. + */ + schedule_all_ipv6_lease_timeouts(); +} + +/* Print usage message. */ +#ifndef UNIT_TEST +static void +usage(void) { + log_info("%s %s", message, PACKAGE_VERSION); + log_info(copyright); + log_info(arr); + + log_fatal("Usage: dhcpd [-p <UDP port #>] [-f] [-d] [-q] [-t|-T]\n" +#ifdef DHCPv6 + " [-4|-6] [-cf config-file] [-lf lease-file]\n" +#else /* !DHCPv6 */ + " [-cf config-file] [-lf lease-file]\n" +#endif /* DHCPv6 */ +#if defined (PARANOIA) + /* meld into the following string */ + " [-user user] [-group group] [-chroot dir]\n" +#endif /* PARANOIA */ +#if defined (TRACING) + " [-tf trace-output-file]\n" + " [-play trace-input-file]\n" +#endif /* TRACING */ + " [-pf pid-file] [--no-pid] [-s server]\n" + " [if0 [...ifN]]"); +} +#endif + +void lease_pinged (from, packet, length) + struct iaddr from; + u_int8_t *packet; + int length; +{ + struct lease *lp; + + /* Don't try to look up a pinged lease if we aren't trying to + ping one - otherwise somebody could easily make us churn by + just forging repeated ICMP EchoReply packets for us to look + up. */ + if (!outstanding_pings) + return; + + lp = (struct lease *)0; + if (!find_lease_by_ip_addr (&lp, from, MDL)) { + log_debug ("unexpected ICMP Echo Reply from %s", + piaddr (from)); + return; + } + + if (!lp -> state) { +#if defined (FAILOVER_PROTOCOL) + if (!lp -> pool || + !lp -> pool -> failover_peer) +#endif + log_debug ("ICMP Echo Reply for %s late or spurious.", + piaddr (from)); + goto out; + } + + if (lp -> ends > cur_time) { + log_debug ("ICMP Echo reply while lease %s valid.", + piaddr (from)); + } + + /* At this point it looks like we pinged a lease and got a + response, which shouldn't have happened. */ + data_string_forget (&lp -> state -> parameter_request_list, MDL); + free_lease_state (lp -> state, MDL); + lp -> state = (struct lease_state *)0; + + abandon_lease (lp, "pinged before offer"); + cancel_timeout (lease_ping_timeout, lp); + --outstanding_pings; + out: + lease_dereference (&lp, MDL); +} + +void lease_ping_timeout (vlp) + void *vlp; +{ + struct lease *lp = vlp; + +#if defined (DEBUG_MEMORY_LEAKAGE) + unsigned long previous_outstanding = dmalloc_outstanding; +#endif + + --outstanding_pings; + dhcp_reply (lp); + +#if defined (DEBUG_MEMORY_LEAKAGE) + log_info ("generation %ld: %ld new, %ld outstanding, %ld long-term", + dmalloc_generation, + dmalloc_outstanding - previous_outstanding, + dmalloc_outstanding, dmalloc_longterm); +#endif +#if defined (DEBUG_MEMORY_LEAKAGE) + dmalloc_dump_outstanding (); +#endif +} + +int dhcpd_interface_setup_hook (struct interface_info *ip, struct iaddr *ia) +{ + struct subnet *subnet; + struct shared_network *share; + isc_result_t status; + + /* Special case for fallback network - not sure why this is + necessary. */ + if (!ia) { + const char *fnn = "fallback-net"; + status = shared_network_allocate (&ip -> shared_network, MDL); + if (status != ISC_R_SUCCESS) + log_fatal ("No memory for shared subnet: %s", + isc_result_totext (status)); + ip -> shared_network -> name = dmalloc (strlen (fnn) + 1, MDL); + strcpy (ip -> shared_network -> name, fnn); + return 1; + } + + /* If there's a registered subnet for this address, + connect it together... */ + subnet = (struct subnet *)0; + if (find_subnet (&subnet, *ia, MDL)) { + /* If this interface has multiple aliases on the same + subnet, ignore all but the first we encounter. */ + if (!subnet -> interface) { + interface_reference (&subnet -> interface, ip, MDL); + subnet -> interface_address = *ia; + } else if (subnet -> interface != ip) { + log_error ("Multiple interfaces match the %s: %s %s", + "same subnet", + subnet -> interface -> name, ip -> name); + } + share = subnet -> shared_network; + if (ip -> shared_network && + ip -> shared_network != share) { + log_fatal ("Interface %s matches multiple shared %s", + ip -> name, "networks"); + } else { + if (!ip -> shared_network) + shared_network_reference + (&ip -> shared_network, share, MDL); + } + + if (!share -> interface) { + interface_reference (&share -> interface, ip, MDL); + } else if (share -> interface != ip) { + log_error ("Multiple interfaces match the %s: %s %s", + "same shared network", + share -> interface -> name, ip -> name); + } + subnet_dereference (&subnet, MDL); + } + return 1; +} + +static TIME shutdown_time; +static int omapi_connection_count; +enum dhcp_shutdown_state shutdown_state; + +isc_result_t dhcp_io_shutdown (omapi_object_t *obj, void *foo) +{ + /* Shut down all listeners. */ + if (shutdown_state == shutdown_listeners && + obj -> type == omapi_type_listener && + obj -> inner && + obj -> inner -> type == omapi_type_protocol_listener) { + omapi_listener_destroy (obj, MDL); + return ISC_R_SUCCESS; + } + + /* Shut down all existing omapi connections. */ + if (obj -> type == omapi_type_connection && + obj -> inner && + obj -> inner -> type == omapi_type_protocol) { + if (shutdown_state == shutdown_drop_omapi_connections) { + omapi_disconnect (obj, 1); + } + omapi_connection_count++; + if (shutdown_state == shutdown_omapi_connections) { + omapi_disconnect (obj, 0); + return ISC_R_SUCCESS; + } + } + + /* Shutdown all DHCP interfaces. */ + if (obj -> type == dhcp_type_interface && + shutdown_state == shutdown_dhcp) { + dhcp_interface_remove (obj, (omapi_object_t *)0); + return ISC_R_SUCCESS; + } + return ISC_R_SUCCESS; +} + +static isc_result_t dhcp_io_shutdown_countdown (void *vlp) +{ +#if defined (FAILOVER_PROTOCOL) + dhcp_failover_state_t *state; + int failover_connection_count = 0; +#endif + struct timeval tv; + + oncemore: + if (shutdown_state == shutdown_listeners || + shutdown_state == shutdown_omapi_connections || + shutdown_state == shutdown_drop_omapi_connections || + shutdown_state == shutdown_dhcp) { + omapi_connection_count = 0; + omapi_io_state_foreach (dhcp_io_shutdown, 0); + } + + if ((shutdown_state == shutdown_listeners || + shutdown_state == shutdown_omapi_connections || + shutdown_state == shutdown_drop_omapi_connections) && + omapi_connection_count == 0) { + shutdown_state = shutdown_dhcp; + shutdown_time = cur_time; + goto oncemore; + } else if (shutdown_state == shutdown_listeners && + cur_time - shutdown_time > 4) { + shutdown_state = shutdown_omapi_connections; + shutdown_time = cur_time; + } else if (shutdown_state == shutdown_omapi_connections && + cur_time - shutdown_time > 4) { + shutdown_state = shutdown_drop_omapi_connections; + shutdown_time = cur_time; + } else if (shutdown_state == shutdown_drop_omapi_connections && + cur_time - shutdown_time > 4) { + shutdown_state = shutdown_dhcp; + shutdown_time = cur_time; + goto oncemore; + } else if (shutdown_state == shutdown_dhcp && + cur_time - shutdown_time > 4) { + shutdown_state = shutdown_done; + shutdown_time = cur_time; + } + +#if defined (FAILOVER_PROTOCOL) + /* Set all failover peers into the shutdown state. */ + if (shutdown_state == shutdown_dhcp) { + for (state = failover_states; state; state = state -> next) { + if (state -> me.state == normal) { + dhcp_failover_set_state (state, shut_down); + failover_connection_count++; + } + if (state -> me.state == shut_down && + state -> partner.state != partner_down) + failover_connection_count++; + } + } + + if (shutdown_state == shutdown_done) { + for (state = failover_states; state; state = state -> next) { + if (state -> me.state == shut_down) { + if (state -> link_to_peer) + dhcp_failover_link_dereference (&state -> link_to_peer, + MDL); + dhcp_failover_set_state (state, recover); + } + } +#if defined (DEBUG_MEMORY_LEAKAGE) && \ + defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT) + free_everything (); + omapi_print_dmalloc_usage_by_caller (); +#endif + exit (0); + } +#else + if (shutdown_state == shutdown_done) { +#if defined (DEBUG_MEMORY_LEAKAGE) && \ + defined (DEBUG_MEMORY_LEAKAGE_ON_EXIT) + free_everything (); + omapi_print_dmalloc_usage_by_caller (); +#endif + exit (0); + } +#endif + if (shutdown_state == shutdown_dhcp && +#if defined(FAILOVER_PROTOCOL) + !failover_connection_count && +#endif + ISC_TRUE) { + shutdown_state = shutdown_done; + shutdown_time = cur_time; + goto oncemore; + } + tv.tv_sec = cur_tv.tv_sec + 1; + tv.tv_usec = cur_tv.tv_usec; + add_timeout (&tv, + (void (*)(void *))dhcp_io_shutdown_countdown, 0, 0, 0); + return ISC_R_SUCCESS; +} + +isc_result_t dhcp_set_control_state (control_object_state_t oldstate, + control_object_state_t newstate) +{ + struct timeval tv; + + if (newstate != server_shutdown) + return DHCP_R_INVALIDARG; + /* Re-entry. */ + if (shutdown_signal == SIGUSR1) + return ISC_R_SUCCESS; + shutdown_time = cur_time; + shutdown_state = shutdown_listeners; + /* Called by user. */ + if (shutdown_signal == 0) { + shutdown_signal = SIGUSR1; + dhcp_io_shutdown_countdown (0); + return ISC_R_SUCCESS; + } + /* Called on signal. */ + log_info("Received signal %d, initiating shutdown.", shutdown_signal); + shutdown_signal = SIGUSR1; + + /* + * Prompt the shutdown event onto the timer queue + * and return to the dispatch loop. + */ + tv.tv_sec = cur_tv.tv_sec; + tv.tv_usec = cur_tv.tv_usec + 1; + add_timeout(&tv, + (void (*)(void *))dhcp_io_shutdown_countdown, 0, 0, 0); + return ISC_R_SUCCESS; +} |