+++ /dev/null
-/*
- Unix SMB/CIFS implementation.
-
- read a file containing DNS names, types and IP addresses
-
- Copyright (C) Andrew Tridgell 1994-1998
- Copyright (C) Jeremy Allison 2007
- Copyright (C) Andrew Bartlett 2009-2011
-
- 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 <http://www.gnu.org/licenses/>.
-*/
-
-/* The purpose of this file is to read the file generated by the samba_dnsupdate script */
-
-#include "includes.h"
-#include "lib/util/xfile.h"
-#include "lib/util/util_net.h"
-#include "system/filesys.h"
-#include "system/network.h"
-#include "libcli/nbt/libnbt.h"
-#include "libcli/dns/dns.h"
-
-#ifdef strcasecmp
-#undef strcasecmp
-#endif
-
-/********************************************************
- Start parsing the dns_hosts_file file.
-*********************************************************/
-
-static XFILE *startdns_hosts_file(const char *fname)
-{
- XFILE *fp = x_fopen(fname,O_RDONLY, 0);
- if (!fp) {
- DEBUG(4,("startdns_hosts_file: Can't open dns_hosts_file file %s. "
- "Error was %s\n",
- fname, strerror(errno)));
- return NULL;
- }
- return fp;
-}
-
-/********************************************************
- Parse the next line in the dns_hosts_file file.
-*********************************************************/
-
-static bool getdns_hosts_fileent(TALLOC_CTX *ctx, XFILE *fp, char **pp_name, char **pp_name_type,
- char **pp_next_name,
- struct sockaddr_storage *pss, uint32_t *p_port)
-{
- char line[1024];
-
- *pp_name = NULL;
- *pp_name_type = NULL;
- *pp_next_name = NULL;
- *p_port = 0;
-
- while(!x_feof(fp) && !x_ferror(fp)) {
- char *name_type = NULL;
- char *name = NULL;
- char *next_name = NULL;
- char *ip = NULL;
- char *port = NULL;
-
- const char *ptr;
- int count = 0;
-
- if (!fgets_slash(line,sizeof(line),fp)) {
- continue;
- }
-
- if (*line == '#') {
- continue;
- }
-
- ptr = line;
-
- if (next_token_talloc(ctx, &ptr, &name_type, NULL))
- ++count;
- if (count == 0) {
- continue;
- }
- if (next_token_talloc(ctx, &ptr, &name, NULL))
- ++count;
- if ((strcasecmp(name_type, "A") == 0) ||
- (strcasecmp(name_type, "AAAA") == 0))
- {
- if (next_token_talloc(ctx, &ptr, &ip, NULL))
- ++count;
- } else if (name_type && strcasecmp(name_type, "SRV") == 0) {
- if (next_token_talloc(ctx, &ptr, &next_name, NULL))
- ++count;
- if (next_token_talloc(ctx, &ptr, &port, NULL))
- ++count;
- } else if (name_type && strcasecmp(name_type, "CNAME") == 0) {
- if (next_token_talloc(ctx, &ptr, &next_name, NULL))
- ++count;
- } else if (name_type && strcasecmp(name_type, "NS") == 0) {
- if (next_token_talloc(ctx, &ptr, &next_name, NULL))
- ++count;
- }
-
- if ((strcasecmp(name_type, "A") == 0) ||
- (strcasecmp(name_type, "AAAA") == 0))
- {
- if (count != 3) {
- DEBUG(0,("getdns_hosts_fileent: Ill formed hosts A[AAA] record [%s]\n",
- line));
- continue;
- }
- DEBUG(4, ("getdns_hosts_fileent: host entry: %s %s %s\n",
- name_type, name, ip));
- if (!interpret_string_addr(pss, ip, AI_NUMERICHOST)) {
- DEBUG(0,("getdns_hosts_fileent: invalid address "
- "%s.\n", ip));
- }
-
- } else if (strcasecmp(name_type, "SRV") == 0) {
- if (count != 4) {
- DEBUG(0,("getdns_hosts_fileent: Ill formed hosts SRV record [%s]\n",
- line));
- continue;
- }
- *p_port = strtoul(port, NULL, 10);
- if (*p_port == UINT32_MAX) {
- DEBUG(0, ("getdns_hosts_fileent: Ill formed hosts SRV record [%s] (invalid port: %s)\n",
- line, port));
- continue;
- }
- DEBUG(4, ("getdns_hosts_fileent: host entry: %s %s %s %u\n",
- name_type, name, next_name, (unsigned int)*p_port));
- *pp_next_name = talloc_strdup(ctx, next_name);
- if (!*pp_next_name) {
- return false;
- }
- } else if (strcasecmp(name_type, "CNAME") == 0) {
- if (count != 3) {
- DEBUG(0,("getdns_hosts_fileent: Ill formed hosts CNAME record [%s]\n",
- line));
- continue;
- }
- DEBUG(4, ("getdns_hosts_fileent: host entry: %s %s %s\n",
- name_type, name, next_name));
- *pp_next_name = talloc_strdup(ctx, next_name);
- if (!*pp_next_name) {
- return false;
- }
- } else if (strcasecmp(name_type, "NS") == 0) {
- if (count != 3) {
- DEBUG(0,("getdns_hosts_fileent: Ill formed hosts NS record [%s]\n",
- line));
- continue;
- }
- DEBUG(4, ("getdns_hosts_fileent: NS entry: %s %s %s\n",
- name_type, name, next_name));
- continue;
- } else {
- DEBUG(0,("getdns_hosts_fileent: unknown type %s\n", name_type));
- continue;
- }
-
- *pp_name = talloc_strdup(ctx, name);
- if (!*pp_name) {
- return false;
- }
-
- *pp_name_type = talloc_strdup(ctx, name_type);
- if (!*pp_name_type) {
- return false;
- }
- return true;
- }
-
- return false;
-}
-
-/********************************************************
- Finish parsing the dns_hosts_file file.
-*********************************************************/
-
-static void enddns_hosts_file(XFILE *fp)
-{
- x_fclose(fp);
-}
-
-/********************************************************
- Resolve via "dns_hosts" method.
-*********************************************************/
-
-static NTSTATUS resolve_dns_hosts_file_as_dns_rr_recurse(const char *dns_hosts_file,
- const char *name, bool srv_lookup,
- int level, uint32_t port,
- TALLOC_CTX *mem_ctx,
- struct dns_rr_srv **return_rr,
- int *return_count)
-{
- /*
- * "dns_hosts" means parse the local dns_hosts file.
- */
-
- XFILE *fp;
- char *host_name = NULL;
- char *name_type = NULL;
- char *next_name = NULL;
- struct sockaddr_storage return_ss;
- uint32_t srv_port;
- NTSTATUS status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
- TALLOC_CTX *ctx = NULL;
- TALLOC_CTX *ip_list_ctx = NULL;
- struct dns_rr_srv *rr = NULL;
-
- *return_rr = NULL;
-
- /* Don't recurse forever, even on our own flat files */
- if (level > 11) {
- DEBUG(0, ("resolve_dns_hosts_file recursion limit reached looking up %s!\n", name));
- return status;
- }
-
- *return_count = 0;
-
- DEBUG(3,("resolve_dns_hosts: (%d) "
- "Attempting %s dns_hosts lookup for name %s\n",
- level, srv_lookup ? "SRV" : "A[AAA]", name));
-
- fp = startdns_hosts_file(dns_hosts_file);
-
- if ( fp == NULL )
- return NT_STATUS_OBJECT_NAME_NOT_FOUND;
-
- ip_list_ctx = talloc_new(mem_ctx);
- if (!ip_list_ctx) {
- enddns_hosts_file(fp);
- return NT_STATUS_NO_MEMORY;
- }
-
- ctx = talloc_new(ip_list_ctx);
- if (!ctx) {
- talloc_free(ip_list_ctx);
- enddns_hosts_file(fp);
- return NT_STATUS_NO_MEMORY;
- }
-
- while (getdns_hosts_fileent(ctx, fp, &host_name, &name_type, &next_name, &return_ss, &srv_port)) {
- if (!strequal(name, host_name)) {
- /* continue at the bottom of the loop */
- } else if (srv_lookup) {
- if (strcasecmp(name_type, "SRV") == 0) {
- NTSTATUS status_recurse;
- struct dns_rr_srv *tmp_rr;
- int tmp_count = 0;
- /* we only accept one host name per SRV entry */
- status_recurse
- = resolve_dns_hosts_file_as_dns_rr_recurse(dns_hosts_file, next_name,
- false,
- level + 1, srv_port,
- ip_list_ctx, &tmp_rr,
- &tmp_count);
- if (NT_STATUS_EQUAL(status_recurse, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
- /* Don't fail on a dangling SRV record */
- } else if (!NT_STATUS_IS_OK(status_recurse)) {
- enddns_hosts_file(fp);
- talloc_free(ip_list_ctx);
- return status_recurse;
- } else if (tmp_count != 1) {
- status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
- } else {
- status = status_recurse;
- rr = talloc_realloc(ip_list_ctx, rr, struct dns_rr_srv, (*return_count) + 1);
- if (!rr) {
- enddns_hosts_file(fp);
- return NT_STATUS_NO_MEMORY;
- }
- talloc_steal(rr, tmp_rr);
- rr[*return_count] = *tmp_rr;
- *return_count = (*return_count) + 1;
- }
- }
- } else if (strcasecmp(name_type, "CNAME") == 0) {
- /* we only accept one host name per CNAME */
- enddns_hosts_file(fp);
- status = resolve_dns_hosts_file_as_dns_rr_recurse(dns_hosts_file, next_name, false,
- level + 1, port,
- mem_ctx, return_rr, return_count);
- talloc_free(ip_list_ctx);
- return status;
- } else if ((strcasecmp(name_type, "A") == 0) ||
- (strcasecmp(name_type, "AAAA") == 0))
- {
- if (*return_count == 0) {
- /* We are happy to keep looking for other possible A record matches */
- rr = talloc_zero(ip_list_ctx,
- struct dns_rr_srv);
-
- if (rr == NULL) {
- TALLOC_FREE(ctx);
- enddns_hosts_file(fp);
- DEBUG(3,("resolve_dns_hosts: talloc_realloc fail !\n"));
- return NT_STATUS_NO_MEMORY;
- }
-
- rr->hostname = talloc_strdup(rr, host_name);
-
- if (rr->hostname == NULL) {
- TALLOC_FREE(ctx);
- enddns_hosts_file(fp);
- DEBUG(3,("resolve_dns_hosts: talloc_realloc fail !\n"));
- return NT_STATUS_NO_MEMORY;
- }
- rr->port = port;
-
- *return_count = 1;
- }
-
- /* Set the specified port (possibly from a SRV lookup) into the structure we return */
- set_sockaddr_port((struct sockaddr *)&return_ss, port);
-
- /* We are happy to keep looking for other possible A record matches */
- rr->ss_s = talloc_realloc(rr, rr->ss_s,
- struct sockaddr_storage,
- rr->num_ips + 1);
-
- if (rr->ss_s == NULL) {
- TALLOC_FREE(ctx);
- enddns_hosts_file(fp);
- DEBUG(3,("resolve_dns_hosts: talloc_realloc fail !\n"));
- return NT_STATUS_NO_MEMORY;
- }
-
- rr->ss_s[rr->num_ips] = return_ss;
- rr->num_ips += 1;
-
- /* we found something */
- status = NT_STATUS_OK;
- }
-
- TALLOC_FREE(ctx);
- ctx = talloc_new(mem_ctx);
- if (!ctx) {
- enddns_hosts_file(fp);
- return NT_STATUS_NO_MEMORY;
- }
- }
-
- *return_rr = talloc_steal(mem_ctx, rr);
- TALLOC_FREE(ip_list_ctx);
- enddns_hosts_file(fp);
- return status;
-}
-
-/********************************************************
- Resolve via "dns_hosts_file" method, returning a list of sockaddr_storage values
-*********************************************************/
-
-NTSTATUS resolve_dns_hosts_file_as_sockaddr(const char *dns_hosts_file,
- const char *name, bool srv_lookup,
- TALLOC_CTX *mem_ctx,
- struct sockaddr_storage **return_iplist,
- int *return_count)
-{
- NTSTATUS status;
- struct dns_rr_srv *dns_rr = NULL;
- int i, j, rr_count = 0;
-
- *return_iplist = NULL;
- *return_count = 0;
-
- status = resolve_dns_hosts_file_as_dns_rr_recurse(dns_hosts_file, name, srv_lookup,
- 0, 0,
- mem_ctx, &dns_rr, &rr_count);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(3,("resolve_dns_hosts (sockaddr): "
- "failed to obtain %s result records for for name %s: %s\n",
- srv_lookup ? "SRV" : "A", name, nt_errstr(status)));
- return status;
- }
-
- for (i=0; i < rr_count; i++) {
- *return_iplist = talloc_realloc(mem_ctx, *return_iplist, struct sockaddr_storage, *return_count + dns_rr[i].num_ips);
- if (!*return_iplist) {
- return NT_STATUS_NO_MEMORY;
- }
- for (j=0; j < dns_rr[i].num_ips; j++) {
- (*return_iplist)[*return_count] = dns_rr[i].ss_s[j];
- *return_count = *return_count + 1;
- }
- }
- DEBUG(3,("resolve_dns_hosts (sockaddr): "
- "Found %d results for for name %s\n",
- *return_count, name));
-
- return NT_STATUS_OK;
-}
-
-/********************************************************
- Resolve via "dns_hosts_file" method, returning struct dns_rr_srv
-*********************************************************/
-
-NTSTATUS resolve_dns_hosts_file_as_dns_rr(const char *dns_hosts_file,
- const char *name, bool srv_lookup,
- TALLOC_CTX *mem_ctx,
- struct dns_rr_srv **return_rr,
- int *return_count)
-{
- NTSTATUS status;
- *return_rr = NULL;
- *return_count = 0;
-
- status = resolve_dns_hosts_file_as_dns_rr_recurse(dns_hosts_file, name, srv_lookup,
- 0, 0,
- mem_ctx, return_rr, return_count);
-
- if (NT_STATUS_IS_OK(status)) {
- DEBUG(3,("resolve_dns_hosts (dns_rr): "
- "Found %d %s result records for for name %s\n",
- *return_count, srv_lookup ? "SRV" : "A[AAA]", name));
- } else {
- DEBUG(3,("resolve_dns_hosts (dns_rr): "
- "failed to obtain %s result records for for name %s: %s\n",
- srv_lookup ? "SRV" : "A[AAA]", name, nt_errstr(status)));
- }
- return status;
-}
git.samba.org / obnox / samba / samba-obnox.git / commitdiff