/* SSSD ipa_dyndns.c Authors: Stephen Gallagher Copyright (C) 2010 Red Hat This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ #include #include #include #include #include #include #include #include "util/util.h" #include "confdb/confdb.h" #include "providers/ipa/ipa_common.h" #include "providers/ipa/ipa_dyndns.h" #include "util/child_common.h" #include "providers/data_provider.h" #include "providers/ldap/ldap_common.h" #include "providers/ldap/sdap_async_private.h" #include "resolv/async_resolv.h" #define IPA_DYNDNS_TIMEOUT 15 #define IPA_DYNDNS_REMOVE_A 0x1 #define IPA_DYNDNS_REMOVE_AAAA 0x2 struct ipa_ipaddress { struct ipa_ipaddress *next; struct ipa_ipaddress *prev; struct sockaddr_storage *addr; bool matched; }; struct ipa_dyndns_ctx { struct ipa_options *ipa_ctx; struct sdap_id_op* sdap_op; char *hostname; struct ipa_ipaddress *addresses; bool use_server_with_nsupdate; uint8_t remove_af; enum restrict_family family_order; }; static struct tevent_req * ipa_dyndns_update_send(struct ipa_options *ctx); static void ipa_dyndns_update_done(struct tevent_req *req); static errno_t ipa_ipaddress_list_as_string_list(TALLOC_CTX *mem_ctx, struct ipa_ipaddress *ipa_addr_list, char ***_straddrs) { struct ipa_ipaddress *ipa_addr; size_t count; int ai; char **straddrs; const char *ip; char ip_addr[INET6_ADDRSTRLEN]; errno_t ret; count = 0; DLIST_FOR_EACH(ipa_addr, ipa_addr_list) { count++; } straddrs = talloc_array(mem_ctx, char *, count+1); if (straddrs == NULL) { return ENOMEM; } ai = 0; DLIST_FOR_EACH(ipa_addr, ipa_addr_list) { switch(ipa_addr->addr->ss_family) { case AF_INET: errno = 0; ip = inet_ntop(ipa_addr->addr->ss_family, &(((struct sockaddr_in *)ipa_addr->addr)->sin_addr), ip_addr, INET6_ADDRSTRLEN); if (ip == NULL) { ret = errno; goto fail; } break; case AF_INET6: errno = 0; ip = inet_ntop(ipa_addr->addr->ss_family, &(((struct sockaddr_in6 *)ipa_addr->addr)->sin6_addr), ip_addr, INET6_ADDRSTRLEN); if (ip == NULL) { ret = errno; goto fail; } break; default: DEBUG(0, ("Unknown address family\n")); continue; } straddrs[ai] = talloc_strdup(straddrs, ip); if (straddrs[ai] == NULL) { ret = ENOMEM; goto fail; } ai++; } straddrs[count] = NULL; *_straddrs = straddrs; return EOK; fail: talloc_free(straddrs); return ret; } errno_t ipa_dyndns_init(struct be_ctx *be_ctx, struct ipa_options *ctx) { errno_t ret; ctx->resolv = be_ctx->be_res->resolv; ret = be_add_online_cb(be_ctx, be_ctx, ipa_dyndns_update, ctx, NULL); if (ret != EOK) { DEBUG(1, ("Could not set up online callback\n")); return ret; } return EOK; } void ipa_dyndns_update(void *pvt) { struct ipa_options *ctx = talloc_get_type(pvt, struct ipa_options); struct tevent_req *req = ipa_dyndns_update_send(ctx); if (req == NULL) { DEBUG(1, ("Could not update DNS\n")); return; } tevent_req_set_callback(req, ipa_dyndns_update_done, NULL); } static bool ok_for_dns(struct sockaddr *sa) { char straddr[INET6_ADDRSTRLEN]; if (sa->sa_family == AF_INET6) { struct in6_addr *addr = &((struct sockaddr_in6 *) sa)->sin6_addr; if (inet_ntop(AF_INET6, addr, straddr, INET6_ADDRSTRLEN) == NULL) { DEBUG(SSSDBG_MINOR_FAILURE, ("inet_ntop failed, won't log IP addresses\n")); snprintf(straddr, INET6_ADDRSTRLEN, "unknown"); } if (IN6_IS_ADDR_LINKLOCAL(addr)) { DEBUG(SSSDBG_FUNC_DATA, ("Link local IPv6 address %s\n", straddr)); return false; } else if (IN6_IS_ADDR_LOOPBACK(addr)) { DEBUG(SSSDBG_FUNC_DATA, ("Loopback IPv6 address %s\n", straddr)); return false; } else if (IN6_IS_ADDR_MULTICAST(addr)) { DEBUG(SSSDBG_FUNC_DATA, ("Multicast IPv6 address %s\n", straddr)); return false; } } else if (sa->sa_family == AF_INET) { struct in_addr *addr = &((struct sockaddr_in *) sa)->sin_addr; if (inet_ntop(AF_INET, addr, straddr, INET6_ADDRSTRLEN) == NULL) { DEBUG(SSSDBG_MINOR_FAILURE, ("inet_ntop failed, won't log IP addresses\n")); snprintf(straddr, INET6_ADDRSTRLEN, "unknown"); } if (IN_MULTICAST(ntohl(addr->s_addr))) { DEBUG(SSSDBG_FUNC_DATA, ("Multicast IPv4 address %s\n", straddr)); return false; } else if (inet_netof(*addr) == IN_LOOPBACKNET) { DEBUG(SSSDBG_FUNC_DATA, ("Loopback IPv4 address %s\n", straddr)); return false; } else if ((addr->s_addr & 0xffff0000) == 0xa9fe0000) { /* 169.254.0.0/16 */ DEBUG(SSSDBG_FUNC_DATA, ("Link-local IPv4 address %s\n", straddr)); return false; } else if (addr->s_addr == htonl(INADDR_BROADCAST)) { DEBUG(SSSDBG_FUNC_DATA, ("Broadcast IPv4 address %s\n", straddr)); return false; } } else { DEBUG(SSSDBG_CRIT_FAILURE, ("Unknown address family\n")); return false; } return true; } static void ipa_dyndns_sdap_connect_done(struct tevent_req *subreq); static int ipa_dyndns_add_ldap_iface(struct ipa_dyndns_ctx *state, struct sdap_handle *sh); static int ipa_dyndns_gss_tsig_update_step(struct tevent_req *req); static struct tevent_req * ipa_dyndns_gss_tsig_update_send(struct ipa_dyndns_ctx *ctx); static void ipa_dyndns_gss_tsig_update_done(struct tevent_req *subreq); static struct tevent_req * ipa_dyndns_update_send(struct ipa_options *ctx) { int ret; char *iface; struct ipa_dyndns_ctx *state; struct ifaddrs *ifaces; struct ifaddrs *ifa; struct ipa_ipaddress *address; struct tevent_req *req, *subreq; size_t addrsize; struct sdap_id_ctx *id_ctx = ctx->id_ctx->sdap_id_ctx; DEBUG (9, ("Performing update\n")); req = tevent_req_create(ctx, &state, struct ipa_dyndns_ctx); if (req == NULL) { return NULL; } state->ipa_ctx = ctx; state->use_server_with_nsupdate = false; state->family_order = id_ctx->be->be_res->family_order; iface = dp_opt_get_string(ctx->basic, IPA_DYNDNS_IFACE); if (iface) { /* Get the IP addresses associated with the * specified interface */ errno = 0; ret = getifaddrs(&ifaces); if (ret == -1) { ret = errno; DEBUG(0, ("Could not read interfaces [%d][%s]\n", ret, strerror(ret))); goto failed; } for(ifa = ifaces; ifa != NULL; ifa=ifa->ifa_next) { /* Some interfaces don't have an ifa_addr */ if (!ifa->ifa_addr) continue; /* Add IP addresses to the list */ if((ifa->ifa_addr->sa_family == AF_INET || ifa->ifa_addr->sa_family == AF_INET6) && strcasecmp(ifa->ifa_name, iface) == 0 && ok_for_dns(ifa->ifa_addr)) { /* Add this address to the IP address list */ address = talloc_zero(state, struct ipa_ipaddress); if (!address) { goto failed; } addrsize = ifa->ifa_addr->sa_family == AF_INET ? \ sizeof(struct sockaddr_in) : \ sizeof(struct sockaddr_in6); address->addr = talloc_memdup(address, ifa->ifa_addr, addrsize); if(address->addr == NULL) { goto failed; } DLIST_ADD(state->addresses, address); } } freeifaddrs(ifaces); ret = ipa_dyndns_gss_tsig_update_step(req); if (ret != EOK) { goto failed; } } else { /* Detect DYNDNS interface from LDAP connection */ state->sdap_op = sdap_id_op_create(state, state->ipa_ctx->id_ctx->sdap_id_ctx->conn_cache); if (!state->sdap_op) { DEBUG(1, ("sdap_id_op_create failed\n")); ret = ENOMEM; goto failed; } subreq = sdap_id_op_connect_send(state->sdap_op, state, &ret); if (!subreq) { DEBUG(1, ("sdap_id_op_connect_send failed: [%d](%s)\n", ret, strerror(ret))); goto failed; } tevent_req_set_callback(subreq, ipa_dyndns_sdap_connect_done, req); } return req; failed: talloc_free(req); return NULL; } static void ipa_dyndns_sdap_connect_done(struct tevent_req *subreq) { struct tevent_req *req = tevent_req_callback_data(subreq, struct tevent_req); struct ipa_dyndns_ctx *state = tevent_req_data(req, struct ipa_dyndns_ctx); int ret, dp_error; ret = sdap_id_op_connect_recv(subreq, &dp_error); talloc_zfree(subreq); if (ret != EOK) { if (dp_error == DP_ERR_OFFLINE) { DEBUG(9,("No LDAP server is available, dynamic DNS update is skipped in OFFLINE mode.\n")); } else { DEBUG(9,("Failed to connect to LDAP server: [%d](%s)\n", ret, strerror(ret))); } goto failed; } ret = ipa_dyndns_add_ldap_iface(state, sdap_id_op_handle(state->sdap_op)); talloc_zfree(state->sdap_op); if (ret != EOK) { goto failed; } ret = ipa_dyndns_gss_tsig_update_step(req); if (ret != EOK) { goto failed; } return; failed: tevent_req_error(req, ret); } static int ipa_dyndns_add_ldap_iface(struct ipa_dyndns_ctx *state, struct sdap_handle *sh) { int ret; int fd; struct ipa_ipaddress *address; struct sockaddr_storage ss; socklen_t ss_len = sizeof(ss); if (!sh) { return EINVAL; } /* Get the file descriptor for the primary LDAP connection */ ret = get_fd_from_ldap(sh->ldap, &fd); if (ret != EOK) { return ret; } errno = 0; ret = getsockname(fd, (struct sockaddr *) &ss, &ss_len); if (ret == -1) { ret = errno; DEBUG(SSSDBG_CRIT_FAILURE, ("Failed to get socket name\n")); return ret; } switch(ss.ss_family) { case AF_INET: case AF_INET6: address = talloc(state, struct ipa_ipaddress); if (!address) { return ENOMEM; } address->addr = talloc_memdup(address, &ss, sizeof(struct sockaddr_storage)); if(address->addr == NULL) { talloc_zfree(address); return ENOMEM; } DLIST_ADD(state->addresses, address); break; default: DEBUG(1, ("Connection to LDAP is neither IPv4 nor IPv6\n")); return EIO; } return EOK; } static struct tevent_req * ipa_dyndns_update_get_addrs_send(TALLOC_CTX *mem_ctx, struct ipa_dyndns_ctx *ctx, enum restrict_family family_order); static errno_t ipa_dyndns_update_get_addrs_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx, char ***_addrlist); static errno_t ipa_dyndns_gss_tsig_update_setup_check(struct ipa_dyndns_ctx *state); static void ipa_dyndns_gss_tsig_update_check(struct tevent_req *subreq); static int ipa_dyndns_gss_tsig_update_step(struct tevent_req *req) { struct ipa_dyndns_ctx *state = tevent_req_data(req, struct ipa_dyndns_ctx); char *ipa_hostname; struct tevent_req *subreq; errno_t ret; /* Get the IPA hostname */ ipa_hostname = dp_opt_get_string(state->ipa_ctx->basic, IPA_HOSTNAME); if (!ipa_hostname) { /* This should never happen, but we'll protect * against it anyway. */ return EINVAL; } state->hostname = talloc_strdup(state, ipa_hostname); if (state->hostname == NULL) { return ENOMEM; } DEBUG(7, ("Checking if the update is needed\n")); ret = ipa_dyndns_gss_tsig_update_setup_check(state); if (ret != EOK) { return ret; } subreq = ipa_dyndns_update_get_addrs_send(state, state, state->family_order); if (subreq == NULL) { return ENOMEM; } tevent_req_set_callback(subreq, ipa_dyndns_gss_tsig_update_check, req); return EOK; } static errno_t ipa_dyndns_gss_tsig_update_setup_check(struct ipa_dyndns_ctx *state) { if (dp_opt_get_string(state->ipa_ctx->basic, IPA_DYNDNS_IFACE)) { /* Unless one family is restricted, just replace all * address families during the update */ switch (state->family_order) { case IPV4_ONLY: state->remove_af |= IPA_DYNDNS_REMOVE_A; break; case IPV6_ONLY: state->remove_af |= IPA_DYNDNS_REMOVE_AAAA; break; case IPV4_FIRST: case IPV6_FIRST: state->remove_af |= (IPA_DYNDNS_REMOVE_A | IPA_DYNDNS_REMOVE_AAAA); break; } } else { /* If the interface isn't specified, we ONLY want to have the address * that's connected to the LDAP server stored, so we need to check * (and later remove) both address families. */ state->family_order = IPV4_FIRST; state->remove_af = (IPA_DYNDNS_REMOVE_A | IPA_DYNDNS_REMOVE_AAAA); } return EOK; } static void ipa_dyndns_gss_tsig_update_check(struct tevent_req *subreq) { struct tevent_req *req = tevent_req_callback_data(subreq, struct tevent_req); struct ipa_dyndns_ctx *state = tevent_req_data(req, struct ipa_dyndns_ctx); errno_t ret; char **str_dnslist = NULL, **str_local_list = NULL; char **dns_only = NULL, **local_only = NULL; bool do_update = false; int i; TALLOC_CTX *tmp_ctx; tmp_ctx = talloc_new(NULL); if (!tmp_ctx) { ret = ENOMEM; goto fail; } ret = ipa_dyndns_update_get_addrs_recv(subreq, tmp_ctx, &str_dnslist); talloc_zfree(subreq); if (ret != EOK) { DEBUG(3, ("Getting the current list of addresses failed [%d]: %s\n", ret, strerror(ret))); goto fail; } ret = ipa_ipaddress_list_as_string_list(tmp_ctx, state->addresses, &str_local_list); if (ret != EOK) { DEBUG(3, ("Converting DNS IP addresses to strings failed: [%d]: %s\n", ret, strerror(ret))); goto fail; } /* Compare the lists */ ret = diff_string_lists(tmp_ctx, str_dnslist, str_local_list, &dns_only, &local_only, NULL); if (ret != EOK) { DEBUG(3, ("diff_string_lists failed: [%d]: %s\n", ret, strerror(ret))); goto fail; } if (dns_only) { for (i=0; dns_only[i]; i++) { DEBUG(7, ("Address in DNS only: %s\n", dns_only[i])); do_update = true; } } if (local_only) { for (i=0; local_only[i]; i++) { DEBUG(7, ("Address on localhost only: %s\n", local_only[i])); do_update = true; } } if (do_update) { DEBUG(6, ("Detected IP addresses change, will perform an update\n")); subreq = ipa_dyndns_gss_tsig_update_send(state); if(subreq == NULL) { ret = ENOMEM; goto fail; } tevent_req_set_callback(subreq, ipa_dyndns_gss_tsig_update_done, req); talloc_free(tmp_ctx); return; } DEBUG(6, ("No DNS update needed, addresses did not change\n")); tevent_req_done(req); talloc_free(tmp_ctx); return; fail: talloc_free(tmp_ctx); tevent_req_error(req, ret); } struct ipa_dyndns_update_get_addrs_state { struct ipa_dyndns_ctx *dctx; enum host_database *db; enum restrict_family family_order; char **addrlist; size_t count; }; static void ipa_dyndns_update_get_addrs_done(struct tevent_req *subreq); static errno_t ipa_dyndns_update_get_addrs_step(struct tevent_req *req); static struct tevent_req * ipa_dyndns_update_get_addrs_send(TALLOC_CTX *mem_ctx, struct ipa_dyndns_ctx *ctx, enum restrict_family family_order) { errno_t ret; struct tevent_req *req; struct ipa_dyndns_update_get_addrs_state *state; struct sdap_id_ctx *id_ctx = ctx->ipa_ctx->id_ctx->sdap_id_ctx; req = tevent_req_create(mem_ctx, &state, struct ipa_dyndns_update_get_addrs_state); if (req == NULL) { return NULL; } state->dctx = ctx; state->family_order = family_order; state->db = talloc_array(state, enum host_database, 2); if (state->db == NULL) { ret = ENOMEM; goto immediate; } state->db[0] = DB_DNS; state->db[1] = DB_SENTINEL; ret = ipa_dyndns_update_get_addrs_step(req); if (ret != EOK) { goto immediate; } immediate: if (ret != EOK) { tevent_req_error(req, ret); tevent_req_post(req, id_ctx->be->ev); } return req; } static errno_t ipa_dyndns_update_get_addrs_step(struct tevent_req *req) { struct tevent_req *subreq; struct ipa_dyndns_update_get_addrs_state *state = tevent_req_data(req, struct ipa_dyndns_update_get_addrs_state); struct ipa_id_ctx *ipa_id_ctx = state->dctx->ipa_ctx->id_ctx; subreq = resolv_gethostbyname_send(state, ipa_id_ctx->sdap_id_ctx->be->ev, state->dctx->ipa_ctx->resolv, state->dctx->hostname, state->family_order, state->db); if (!subreq) { return ENOMEM; } tevent_req_set_callback(subreq, ipa_dyndns_update_get_addrs_done, req); return EOK; } static void ipa_dyndns_update_get_addrs_done(struct tevent_req *subreq) { int ret; size_t count; struct tevent_req *req = tevent_req_callback_data(subreq, struct tevent_req); struct ipa_dyndns_update_get_addrs_state *state = tevent_req_data(req, struct ipa_dyndns_update_get_addrs_state); struct resolv_hostent *rhostent; int i; int resolv_status; ret = resolv_gethostbyname_recv(subreq, state, &resolv_status, NULL, &rhostent); talloc_zfree(subreq); /* If the retry did not match, simply quit */ if (ret == ENOENT) { /* If the resolver is set to honor both address families * retry the second one */ if (state->family_order == IPV4_FIRST || state->family_order == IPV6_FIRST) { state->family_order = (state->family_order == IPV4_FIRST) ? \ IPV6_ONLY : IPV4_ONLY; ret = ipa_dyndns_update_get_addrs_step(req); if (ret != EOK) { tevent_req_error(req, ret); } return; } /* Nothing to retry, simply quit */ tevent_req_done(req); return; } else if (ret != EOK) { DEBUG(SSSDBG_OP_FAILURE, ("Could not resolve address for this machine, error [%d]: %s, " "resolver returned: [%d]: %s\n", ret, strerror(ret), resolv_status, resolv_strerror(resolv_status))); tevent_req_error(req, ret); return; } /* EOK */ if (rhostent->addr_list) { for (count=0; rhostent->addr_list[count]; count++); } else { /* The address list is NULL. This is probably a bug in * c-ares, but we need to handle it gracefully. */ DEBUG(SSSDBG_MINOR_FAILURE, ("Lookup of [%s] returned no addresses. Skipping.\n", rhostent->name)); count = 0; } state->addrlist = talloc_realloc(state, state->addrlist, char *, state->count + count + 1); if (!state->addrlist) { tevent_req_error(req, ENOMEM); return; } for (i=0; i < count; i++) { state->addrlist[state->count + i] = \ resolv_get_string_address_index(state->addrlist, rhostent, i); if (state->addrlist[state->count + i] == NULL) { tevent_req_error(req, ENOMEM); return; } } state->count += count; state->addrlist[state->count] = NULL; /* If the resolver is set to honor both address families * and the first one matched, retry the second one to * get the complete list. */ if (((state->family_order == IPV4_FIRST && rhostent->family == AF_INET) || (state->family_order == IPV6_FIRST && rhostent->family == AF_INET6))) { state->family_order = (state->family_order == IPV4_FIRST) ? \ IPV6_ONLY : IPV4_ONLY; ret = ipa_dyndns_update_get_addrs_step(req); if (ret != EOK) { tevent_req_error(req, ret); } return; } /* The second address matched either immediatelly or after a retry. * No need to retry again. */ tevent_req_done(req); return; } static errno_t ipa_dyndns_update_get_addrs_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx, char ***_addrlist) { struct ipa_dyndns_update_get_addrs_state *state = tevent_req_data(req, struct ipa_dyndns_update_get_addrs_state); TEVENT_REQ_RETURN_ON_ERROR(req); *_addrlist = talloc_steal(mem_ctx, state->addrlist); return EOK; } struct ipa_nsupdate_ctx { char *update_msg; struct ipa_dyndns_ctx *dyndns_ctx; int pipefd_to_child; struct tevent_timer *timeout_handler; int child_status; }; static int create_nsupdate_message(struct ipa_nsupdate_ctx *ctx, uint8_t remove_af, bool use_server_with_nsupdate); static struct tevent_req * fork_nsupdate_send(struct ipa_nsupdate_ctx *ctx); static void fork_nsupdate_done(struct tevent_req *subreq); static struct tevent_req * ipa_dyndns_gss_tsig_update_send(struct ipa_dyndns_ctx *ctx) { int ret; struct ipa_nsupdate_ctx *state; struct tevent_req *req; struct tevent_req *subreq; req = tevent_req_create(ctx, &state, struct ipa_nsupdate_ctx); if(req == NULL) { return NULL; } state->dyndns_ctx = ctx; state->child_status = 0; /* Format the message to pass to the nsupdate command */ ret = create_nsupdate_message(state, ctx->remove_af, ctx->use_server_with_nsupdate); if (ret != EOK) { goto failed; } /* Fork a child process to perform the DNS update */ subreq = fork_nsupdate_send(state); if(subreq == NULL) { goto failed; } tevent_req_set_callback(subreq, fork_nsupdate_done, req); return req; failed: talloc_free(req); return NULL; } struct nsupdate_send_ctx { struct ipa_nsupdate_ctx *nsupdate_ctx; int child_status; }; static int create_nsupdate_message(struct ipa_nsupdate_ctx *ctx, uint8_t remove_af, bool use_server_with_nsupdate) { int ret, i, ttl; char *servername = NULL; char *realm; char *realm_directive; char *zone; char ip_addr[INET6_ADDRSTRLEN]; const char *ip; struct ipa_ipaddress *new_record; TALLOC_CTX *tmp_ctx; tmp_ctx = talloc_new(NULL); if (!tmp_ctx) return ENOMEM; realm = dp_opt_get_string(ctx->dyndns_ctx->ipa_ctx->basic, IPA_KRB5_REALM); if (!realm) { ret = EIO; goto done; } #ifdef HAVE_NSUPDATE_REALM realm_directive = talloc_asprintf(tmp_ctx, "realm %s\n", realm); #else realm_directive = talloc_asprintf(tmp_ctx, ""); #endif if (!realm_directive) { ret = ENOMEM; goto done; } zone = dp_opt_get_string(ctx->dyndns_ctx->ipa_ctx->basic, IPA_DOMAIN); if (!zone) { ret = EIO; goto done; } /* The DNS zone for IPA is the lower-case * version of the IPA domain */ for(i = 0; zone[i] != '\0'; i++) { zone[i] = tolower(zone[i]); } if (use_server_with_nsupdate) { if (strncmp(ctx->dyndns_ctx->ipa_ctx->service->sdap->uri, "ldap://", 7) != 0) { DEBUG(1, ("Unexpected format of LDAP URI.\n")); ret = EIO; goto done; } servername = ctx->dyndns_ctx->ipa_ctx->service->sdap->uri + 7; if (!servername) { ret = EIO; goto done; } DEBUG(SSSDBG_FUNC_DATA, ("Creating update message for server [%s], realm [%s] " "and zone [%s].\n", servername, realm, zone)); /* Add the server, realm and zone headers */ ctx->update_msg = talloc_asprintf(ctx, "server %s\n%szone %s.\n", servername, realm_directive, zone); } else { DEBUG(SSSDBG_FUNC_DATA, ("Creating update message for realm [%s] and zone [%s].\n", realm, zone)); /* Add the realm and zone headers */ ctx->update_msg = talloc_asprintf(ctx, "%szone %s.\n", realm_directive, zone); } if (ctx->update_msg == NULL) { ret = ENOMEM; goto done; } /* Get the TTL details for the record(s) */ ttl = dp_opt_get_int(ctx->dyndns_ctx->ipa_ctx->basic, IPA_DYNDNS_TTL); /* Should not happen but just in case set the default */ if (!ttl) { ttl = 1200; } /* Remove existing entries as needed */ if (remove_af & IPA_DYNDNS_REMOVE_A) { ctx->update_msg = talloc_asprintf_append(ctx->update_msg, "update delete %s. in A\nsend\n", ctx->dyndns_ctx->hostname); if (ctx->update_msg == NULL) { ret = ENOMEM; goto done; } } if (remove_af & IPA_DYNDNS_REMOVE_AAAA) { ctx->update_msg = talloc_asprintf_append(ctx->update_msg, "update delete %s. in AAAA\nsend\n", ctx->dyndns_ctx->hostname); if (ctx->update_msg == NULL) { ret = ENOMEM; goto done; } } DLIST_FOR_EACH(new_record, ctx->dyndns_ctx->addresses) { switch(new_record->addr->ss_family) { case AF_INET: ip = inet_ntop(new_record->addr->ss_family, &(((struct sockaddr_in *)new_record->addr)->sin_addr), ip_addr, INET6_ADDRSTRLEN); if (ip == NULL) { ret = EIO; goto done; } break; case AF_INET6: ip = inet_ntop(new_record->addr->ss_family, &(((struct sockaddr_in6 *)new_record->addr)->sin6_addr), ip_addr, INET6_ADDRSTRLEN); if (ip == NULL) { ret = EIO; goto done; } break; default: DEBUG(0, ("Unknown address family\n")); ret = EIO; goto done; } /* Format the record update */ ctx->update_msg = talloc_asprintf_append( ctx->update_msg, "update add %s. %d in %s %s\n", ctx->dyndns_ctx->hostname, ttl, new_record->addr->ss_family == AF_INET ? "A" : "AAAA", ip_addr); if (ctx->update_msg == NULL) { ret = ENOMEM; goto done; } } ctx->update_msg = talloc_asprintf_append(ctx->update_msg, "send\n"); if (ctx->update_msg == NULL) { ret = ENOMEM; goto done; } DEBUG(SSSDBG_TRACE_FUNC, (" -- Begin nsupdate message -- \n%s", ctx->update_msg)); DEBUG(SSSDBG_TRACE_FUNC, (" -- End nsupdate message -- \n")); ret = EOK; done: talloc_free(tmp_ctx); return ret; } static void ipa_dyndns_stdin_done(struct tevent_req *subreq); static void ipa_dyndns_child_handler(int child_status, struct tevent_signal *sige, void *pvt); static void ipa_dyndns_timeout(struct tevent_context *ev, struct tevent_timer *te, struct timeval tv, void *pvt); static struct tevent_req * fork_nsupdate_send(struct ipa_nsupdate_ctx *ctx) { int pipefd_to_child[2]; pid_t pid; int ret; errno_t err; struct timeval tv; struct tevent_req *req = NULL; struct tevent_req *subreq = NULL; struct nsupdate_send_ctx *state; char *args[3]; req = tevent_req_create(ctx, &state, struct nsupdate_send_ctx); if (req == NULL) { return NULL; } state->nsupdate_ctx = ctx; state->child_status = 0; ret = pipe(pipefd_to_child); if (ret == -1) { err = errno; DEBUG(1, ("pipe failed [%d][%s].\n", err, strerror(err))); return NULL; } pid = fork(); if (pid == 0) { /* child */ args[0] = talloc_strdup(ctx, NSUPDATE_PATH); args[1] = talloc_strdup(ctx, "-g"); args[2] = NULL; if (args[0] == NULL || args[1] == NULL) { return NULL; } close(pipefd_to_child[1]); ret = dup2(pipefd_to_child[0], STDIN_FILENO); if (ret == -1) { err = errno; DEBUG(1, ("dup2 failed [%d][%s].\n", err, strerror(err))); return NULL; } errno = 0; execv(NSUPDATE_PATH, args); err = errno; DEBUG(SSSDBG_CRIT_FAILURE, ("execv failed [%d][%s].\n", err, strerror(err))); return NULL; } else if (pid > 0) { /* parent */ close(pipefd_to_child[0]); ctx->pipefd_to_child = pipefd_to_child[1]; /* Write the update message to the nsupdate child */ subreq = write_pipe_send(req, ctx->dyndns_ctx->ipa_ctx->id_ctx->sdap_id_ctx->be->ev, (uint8_t *)ctx->update_msg, strlen(ctx->update_msg)+1, ctx->pipefd_to_child); if (subreq == NULL) { return NULL; } tevent_req_set_callback(subreq, ipa_dyndns_stdin_done, req); /* Set up SIGCHLD handler */ ret = child_handler_setup(ctx->dyndns_ctx->ipa_ctx->id_ctx->sdap_id_ctx->be->ev, pid, ipa_dyndns_child_handler, req); if (ret != EOK) { return NULL; } /* Set up timeout handler */ tv = tevent_timeval_current_ofs(IPA_DYNDNS_TIMEOUT, 0); ctx->timeout_handler = tevent_add_timer( ctx->dyndns_ctx->ipa_ctx->id_ctx->sdap_id_ctx->be->ev, req, tv, ipa_dyndns_timeout, req); if(ctx->timeout_handler == NULL) { return NULL; } } else { /* error */ err = errno; DEBUG(1, ("fork failed [%d][%s].\n", err, strerror(err))); return NULL; } return req; } static void ipa_dyndns_timeout(struct tevent_context *ev, struct tevent_timer *te, struct timeval tv, void *pvt) { struct tevent_req *req = talloc_get_type(pvt, struct tevent_req); DEBUG(1, ("Timeout reached for dynamic DNS update\n")); tevent_req_error(req, ETIMEDOUT); } static void ipa_dyndns_stdin_done(struct tevent_req *subreq) { /* Verify that the buffer was sent, then return * and wait for the sigchld handler to finish. */ DEBUG(9, ("Sending nsupdate data complete\n")); int ret; struct tevent_req *req = tevent_req_callback_data(subreq, struct tevent_req); struct nsupdate_send_ctx *state = tevent_req_data(req, struct nsupdate_send_ctx); ret = write_pipe_recv(subreq); talloc_zfree(subreq); if (ret != EOK) { DEBUG(1, ("Sending nsupdate data failed\n")); tevent_req_error(req, ret); return; } close(state->nsupdate_ctx->pipefd_to_child); state->nsupdate_ctx->pipefd_to_child = -1; } static void ipa_dyndns_child_handler(int child_status, struct tevent_signal *sige, void *pvt) { struct tevent_req *req = talloc_get_type(pvt, struct tevent_req); struct nsupdate_send_ctx *state = tevent_req_data(req, struct nsupdate_send_ctx); state->child_status = child_status; if (WIFEXITED(child_status) && WEXITSTATUS(child_status) != 0) { DEBUG(1, ("Dynamic DNS child failed with status [%d]\n", child_status)); tevent_req_error(req, EIO); return; } if WIFSIGNALED(child_status) { DEBUG(1, ("Dynamic DNS child was terminated by signal [%d]\n", WTERMSIG(child_status))); tevent_req_error(req, EIO); return; } tevent_req_done(req); } static int ipa_dyndns_child_recv(struct tevent_req *req, int *child_status) { struct nsupdate_send_ctx *state = tevent_req_data(req, struct nsupdate_send_ctx); *child_status = state->child_status; TEVENT_REQ_RETURN_ON_ERROR(req); return EOK; } static int ipa_dyndns_generic_recv(struct tevent_req *req) { TEVENT_REQ_RETURN_ON_ERROR(req); return EOK; } static void fork_nsupdate_done(struct tevent_req *subreq) { int ret; struct tevent_req *req = tevent_req_callback_data(subreq, struct tevent_req); struct ipa_nsupdate_ctx *state = tevent_req_data(req, struct ipa_nsupdate_ctx); ret = ipa_dyndns_child_recv(subreq, &state->child_status); talloc_zfree(subreq); if (ret != EOK) { tevent_req_error(req, ret); return; } tevent_req_done(req); } static int fork_nsupdate_recv(struct tevent_req *req, int *child_status) { struct ipa_nsupdate_ctx *state = tevent_req_data(req, struct ipa_nsupdate_ctx); *child_status = state->child_status; TEVENT_REQ_RETURN_ON_ERROR(req); return EOK; } static void ipa_dyndns_gss_tsig_update_done(struct tevent_req *subreq) { /* Check the return code from the sigchld handler * and return it to the parent request. */ int ret; int child_status; struct tevent_req *req = tevent_req_callback_data(subreq, struct tevent_req); struct ipa_dyndns_ctx *state = tevent_req_data(req, struct ipa_dyndns_ctx); ret = fork_nsupdate_recv(subreq, &child_status); talloc_zfree(subreq); if (ret != EOK) { if (state->use_server_with_nsupdate == false && WIFEXITED(child_status) && WEXITSTATUS(child_status) != 0) { DEBUG(9, ("nsupdate failed, retrying with server name.\n")); state->use_server_with_nsupdate = true; ret = ipa_dyndns_gss_tsig_update_step(req); if (ret != EOK) { tevent_req_error(req, ret); } return; } else { tevent_req_error(req, ret); return; } } tevent_req_done(req); } static void ipa_dyndns_update_done(struct tevent_req *req) { int ret = ipa_dyndns_generic_recv(req); talloc_free(req); if (ret != EOK) { DEBUG(1, ("Updating DNS entry failed\n")); return; } DEBUG(1, ("DNS update finished\n")); }