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+/*++
+/* NAME
+/* dict_mysql 3
+/* SUMMARY
+/* dictionary manager interface to MySQL databases
+/* SYNOPSIS
+/* #include <dict_mysql.h>
+/*
+/* DICT *dict_mysql_open(name, open_flags, dict_flags)
+/* const char *name;
+/* int open_flags;
+/* int dict_flags;
+/* DESCRIPTION
+/* dict_mysql_open() creates a dictionary of type 'mysql'. This
+/* dictionary is an interface for the postfix key->value mappings
+/* to mysql. The result is a pointer to the installed dictionary,
+/* or a null pointer in case of problems.
+/*
+/* The mysql dictionary can manage multiple connections to different
+/* sql servers on different hosts. It assumes that the underlying data
+/* on each host is identical (mirrored) and maintains one connection
+/* at any given time. If any connection fails, any other available
+/* ones will be opened and used. The intent of this feature is to eliminate
+/* a single point of failure for mail systems that would otherwise rely
+/* on a single mysql server.
+/* .PP
+/* Arguments:
+/* .IP name
+/* Either the path to the MySQL configuration file (if it starts
+/* with '/' or '.'), or the prefix which will be used to obtain
+/* main.cf configuration parameters for this search.
+/*
+/* In the first case, the configuration parameters below are
+/* specified in the file as \fIname\fR=\fIvalue\fR pairs.
+/*
+/* In the second case, the configuration parameters are
+/* prefixed with the value of \fIname\fR and an underscore,
+/* and they are specified in main.cf. For example, if this
+/* value is \fImysqlsource\fR, the parameters would look like
+/* \fImysqlsource_user\fR, \fImysqlsource_table\fR, and so on.
+/*
+/* .IP other_name
+/* reference for outside use.
+/* .IP open_flags
+/* Must be O_RDONLY.
+/* .IP dict_flags
+/* See dict_open(3).
+/* .PP
+/* Configuration parameters:
+/* .IP user
+/* Username for connecting to the database.
+/* .IP password
+/* Password for the above.
+/* .IP dbname
+/* Name of the database.
+/* .IP domain
+/* List of domains the queries should be restricted to. If
+/* specified, only FQDN addresses whose domain parts matching this
+/* list will be queried against the SQL database. Lookups for
+/* partial addresses are also suppressed. This can significantly
+/* reduce the query load on the server.
+/* .IP query
+/* Query template, before the query is actually issued, variable
+/* substitutions are performed. See mysql_table(5) for details. If
+/* No query is specified, the legacy variables \fItable\fR,
+/* \fIselect_field\fR, \fIwhere_field\fR and \fIadditional_conditions\fR
+/* are used to construct the query template.
+/* .IP result_format
+/* The format used to expand results from queries. Substitutions
+/* are performed as described in mysql_table(5). Defaults to returning
+/* the lookup result unchanged.
+/* .IP expansion_limit
+/* Limit (if any) on the total number of lookup result values. Lookups which
+/* exceed the limit fail with dict->error=DICT_ERR_RETRY. Note that each
+/* non-empty (and non-NULL) column of a multi-column result row counts as
+/* one result.
+/* .IP table
+/* When \fIquery\fR is not set, name of the table used to construct the
+/* query string. This provides compatibility with older releases.
+/* .IP select_field
+/* When \fIquery\fR is not set, name of the result field used to
+/* construct the query string. This provides compatibility with older
+/* releases.
+/* .IP where_field
+/* When \fIquery\fR is not set, name of the where clause field used to
+/* construct the query string. This provides compatibility with older
+/* releases.
+/* .IP additional_conditions
+/* When \fIquery\fR is not set, additional where clause conditions used
+/* to construct the query string. This provides compatibility with older
+/* releases.
+/* .IP hosts
+/* List of hosts to connect to.
+/* .IP option_file
+/* Read options from the given file instead of the default my.cnf
+/* location.
+/* .IP option_group
+/* Read options from the given group.
+/* .IP require_result_set
+/* Require that every query produces a result set.
+/* .IP tls_cert_file
+/* File containing client's X509 certificate.
+/* .IP tls_key_file
+/* File containing the private key corresponding to \fItls_cert_file\fR.
+/* .IP tls_CAfile
+/* File containing certificates for all of the X509 Certification
+/* Authorities the client will recognize. Takes precedence over
+/* \fItls_CApath\fR.
+/* .IP tls_CApath
+/* Directory containing X509 Certification Authority certificates
+/* in separate individual files.
+/* .IP tls_verify_cert
+/* Verify that the server's name matches the common name of the
+/* certificate.
+/* .PP
+/* For example, if you want the map to reference databases of
+/* the name "your_db" and execute a query like this: select
+/* forw_addr from aliases where alias like '<some username>'
+/* against any database called "vmailer_info" located on hosts
+/* host1.some.domain and host2.some.domain, logging in as user
+/* "vmailer" and password "passwd" then the configuration file
+/* should read:
+/* .PP
+/* user = vmailer
+/* .br
+/* password = passwd
+/* .br
+/* dbname = vmailer_info
+/* .br
+/* table = aliases
+/* .br
+/* select_field = forw_addr
+/* .br
+/* where_field = alias
+/* .br
+/* hosts = host1.some.domain host2.some.domain
+/* .PP
+/* SEE ALSO
+/* dict(3) generic dictionary manager
+/* AUTHOR(S)
+/* Scott Cotton, Joshua Marcus
+/* IC Group, Inc.
+/* scott@icgroup.com
+/*
+/* Liviu Daia
+/* Institute of Mathematics of the Romanian Academy
+/* P.O. BOX 1-764
+/* RO-014700 Bucharest, ROMANIA
+/*
+/* John Fawcett
+/*
+/* Wietse Venema
+/* Google, Inc.
+/* 111 8th Avenue
+/* New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+#include "sys_defs.h"
+
+#ifdef HAS_MYSQL
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <syslog.h>
+#include <time.h>
+#include <mysql.h>
+#include <limits.h>
+#include <errno.h>
+
+#ifdef STRCASECMP_IN_STRINGS_H
+#include <strings.h>
+#endif
+
+/* Utility library. */
+
+#include "dict.h"
+#include "msg.h"
+#include "mymalloc.h"
+#include "argv.h"
+#include "vstring.h"
+#include "split_at.h"
+#include "find_inet.h"
+#include "myrand.h"
+#include "events.h"
+#include "stringops.h"
+
+/* Global library. */
+
+#include "cfg_parser.h"
+#include "db_common.h"
+
+/* Application-specific. */
+
+#include "dict_mysql.h"
+
+/* MySQL 8.x API change */
+
+#if defined(MARIADB_BASE_VERSION) && MYSQL_VERSION_ID >= 50023
+#define DICT_MYSQL_SSL_VERIFY_SERVER_CERT MYSQL_OPT_SSL_VERIFY_SERVER_CERT
+#elif MYSQL_VERSION_ID >= 80000
+#define DICT_MYSQL_SSL_VERIFY_SERVER_CERT MYSQL_OPT_SSL_MODE
+#endif
+
+/* need some structs to help organize things */
+typedef struct {
+ MYSQL *db;
+ char *hostname;
+ char *name;
+ unsigned port;
+ unsigned type; /* TYPEUNIX | TYPEINET */
+ unsigned stat; /* STATUNTRIED | STATFAIL | STATCUR */
+ time_t ts; /* used for attempting reconnection
+ * every so often if a host is down */
+} HOST;
+
+typedef struct {
+ int len_hosts; /* number of hosts */
+ HOST **db_hosts; /* the hosts on which the databases
+ * reside */
+} PLMYSQL;
+
+typedef struct {
+ DICT dict;
+ CFG_PARSER *parser;
+ char *query;
+ char *result_format;
+ char *option_file;
+ char *option_group;
+ void *ctx;
+ int expansion_limit;
+ char *username;
+ char *password;
+ char *dbname;
+ ARGV *hosts;
+ PLMYSQL *pldb;
+#if defined(MYSQL_VERSION_ID) && MYSQL_VERSION_ID >= 40000
+ HOST *active_host;
+ char *tls_cert_file;
+ char *tls_key_file;
+ char *tls_CAfile;
+ char *tls_CApath;
+ char *tls_ciphers;
+#if defined(DICT_MYSQL_SSL_VERIFY_SERVER_CERT)
+ int tls_verify_cert;
+#endif
+#endif
+ int require_result_set;
+} DICT_MYSQL;
+
+#define STATACTIVE (1<<0)
+#define STATFAIL (1<<1)
+#define STATUNTRIED (1<<2)
+
+#define TYPEUNIX (1<<0)
+#define TYPEINET (1<<1)
+
+#define RETRY_CONN_MAX 100
+#define RETRY_CONN_INTV 60 /* 1 minute */
+#define IDLE_CONN_INTV 60 /* 1 minute */
+
+/* internal function declarations */
+static PLMYSQL *plmysql_init(ARGV *);
+static int plmysql_query(DICT_MYSQL *, const char *, VSTRING *, MYSQL_RES **);
+static void plmysql_dealloc(PLMYSQL *);
+static void plmysql_close_host(HOST *);
+static void plmysql_down_host(HOST *);
+static void plmysql_connect_single(DICT_MYSQL *, HOST *);
+static const char *dict_mysql_lookup(DICT *, const char *);
+DICT *dict_mysql_open(const char *, int, int);
+static void dict_mysql_close(DICT *);
+static void mysql_parse_config(DICT_MYSQL *, const char *);
+static HOST *host_init(const char *);
+
+/* dict_mysql_quote - escape SQL metacharacters in input string */
+
+static void dict_mysql_quote(DICT *dict, const char *name, VSTRING *result)
+{
+ DICT_MYSQL *dict_mysql = (DICT_MYSQL *) dict;
+ int len = strlen(name);
+ int buflen;
+
+ /*
+ * We won't get integer overflows in 2*len + 1, because Postfix input
+ * keys have reasonable size limits, better safe than sorry.
+ */
+ if (len > (INT_MAX - VSTRING_LEN(result) - 1) / 2)
+ msg_panic("dict_mysql_quote: integer overflow in %lu+2*%d+1",
+ (unsigned long) VSTRING_LEN(result), len);
+ buflen = 2 * len + 1;
+ VSTRING_SPACE(result, buflen);
+
+#if defined(MYSQL_VERSION_ID) && MYSQL_VERSION_ID >= 40000
+ if (dict_mysql->active_host)
+ mysql_real_escape_string(dict_mysql->active_host->db,
+ vstring_end(result), name, len);
+ else
+#endif
+ mysql_escape_string(vstring_end(result), name, len);
+
+ VSTRING_SKIP(result);
+}
+
+/* dict_mysql_lookup - find database entry */
+
+static const char *dict_mysql_lookup(DICT *dict, const char *name)
+{
+ const char *myname = "dict_mysql_lookup";
+ DICT_MYSQL *dict_mysql = (DICT_MYSQL *) dict;
+ MYSQL_RES *query_res;
+ MYSQL_ROW row;
+ static VSTRING *result;
+ static VSTRING *query;
+ int i;
+ int j;
+ int numrows;
+ int expansion;
+ const char *r;
+ db_quote_callback_t quote_func = dict_mysql_quote;
+ int domain_rc;
+
+ dict->error = 0;
+
+ /*
+ * Don't frustrate future attempts to make Postfix UTF-8 transparent.
+ */
+#ifdef SNAPSHOT
+ if ((dict->flags & DICT_FLAG_UTF8_ACTIVE) == 0
+ && !valid_utf8_string(name, strlen(name))) {
+ if (msg_verbose)
+ msg_info("%s: %s: Skipping lookup of non-UTF-8 key '%s'",
+ myname, dict_mysql->parser->name, name);
+ return (0);
+ }
+#endif
+
+ /*
+ * Optionally fold the key.
+ */
+ if (dict->flags & DICT_FLAG_FOLD_FIX) {
+ if (dict->fold_buf == 0)
+ dict->fold_buf = vstring_alloc(10);
+ vstring_strcpy(dict->fold_buf, name);
+ name = lowercase(vstring_str(dict->fold_buf));
+ }
+
+ /*
+ * If there is a domain list for this map, then only search for addresses
+ * in domains on the list. This can significantly reduce the load on the
+ * server.
+ */
+ if ((domain_rc = db_common_check_domain(dict_mysql->ctx, name)) == 0) {
+ if (msg_verbose)
+ msg_info("%s: Skipping lookup of '%s'", myname, name);
+ return (0);
+ }
+ if (domain_rc < 0) {
+ msg_warn("%s:%s 'domain' pattern match failed for '%s'",
+ dict->type, dict->name, name);
+ DICT_ERR_VAL_RETURN(dict, domain_rc, (char *) 0);
+ }
+#define INIT_VSTR(buf, len) do { \
+ if (buf == 0) \
+ buf = vstring_alloc(len); \
+ VSTRING_RESET(buf); \
+ VSTRING_TERMINATE(buf); \
+ } while (0)
+
+ INIT_VSTR(query, 10);
+
+ /*
+ * Suppress the lookup if the query expansion is empty
+ *
+ * This initial expansion is outside the context of any specific host
+ * connection, we just want to check the key pre-requisites, so when
+ * quoting happens separately for each connection, we don't bother with
+ * quoting...
+ */
+#if defined(MYSQL_VERSION_ID) && MYSQL_VERSION_ID >= 40000
+ quote_func = 0;
+#endif
+ if (!db_common_expand(dict_mysql->ctx, dict_mysql->query,
+ name, 0, query, quote_func))
+ return (0);
+
+ /* do the query - set dict->error & cleanup if there's an error */
+ if (plmysql_query(dict_mysql, name, query, &query_res) == 0) {
+ dict->error = DICT_ERR_RETRY;
+ return (0);
+ }
+ if (query_res == 0)
+ return (0);
+ numrows = mysql_num_rows(query_res);
+ if (msg_verbose)
+ msg_info("%s: retrieved %d rows", myname, numrows);
+ if (numrows == 0) {
+ mysql_free_result(query_res);
+ return 0;
+ }
+ INIT_VSTR(result, 10);
+
+ for (expansion = i = 0; i < numrows && dict->error == 0; i++) {
+ row = mysql_fetch_row(query_res);
+ for (j = 0; j < mysql_num_fields(query_res); j++) {
+ if (db_common_expand(dict_mysql->ctx, dict_mysql->result_format,
+ row[j], name, result, 0)
+ && dict_mysql->expansion_limit > 0
+ && ++expansion > dict_mysql->expansion_limit) {
+ msg_warn("%s: %s: Expansion limit exceeded for key: '%s'",
+ myname, dict_mysql->parser->name, name);
+ dict->error = DICT_ERR_RETRY;
+ break;
+ }
+ }
+ }
+ mysql_free_result(query_res);
+ r = vstring_str(result);
+ return ((dict->error == 0 && *r) ? r : 0);
+}
+
+/* dict_mysql_check_stat - check the status of a host */
+
+static int dict_mysql_check_stat(HOST *host, unsigned stat, unsigned type,
+ time_t t)
+{
+ if ((host->stat & stat) && (!type || host->type & type)) {
+ /* try not to hammer the dead hosts too often */
+ if (host->stat == STATFAIL && host->ts > 0 && host->ts >= t)
+ return 0;
+ return 1;
+ }
+ return 0;
+}
+
+/* dict_mysql_find_host - find a host with the given status */
+
+static HOST *dict_mysql_find_host(PLMYSQL *PLDB, unsigned stat, unsigned type)
+{
+ time_t t;
+ int count = 0;
+ int idx;
+ int i;
+
+ t = time((time_t *) 0);
+ for (i = 0; i < PLDB->len_hosts; i++) {
+ if (dict_mysql_check_stat(PLDB->db_hosts[i], stat, type, t))
+ count++;
+ }
+
+ if (count) {
+ idx = (count > 1) ?
+ 1 + count * (double) myrand() / (1.0 + RAND_MAX) : 1;
+
+ for (i = 0; i < PLDB->len_hosts; i++) {
+ if (dict_mysql_check_stat(PLDB->db_hosts[i], stat, type, t) &&
+ --idx == 0)
+ return PLDB->db_hosts[i];
+ }
+ }
+ return 0;
+}
+
+/* dict_mysql_get_active - get an active connection */
+
+static HOST *dict_mysql_get_active(DICT_MYSQL *dict_mysql)
+{
+ const char *myname = "dict_mysql_get_active";
+ PLMYSQL *PLDB = dict_mysql->pldb;
+ HOST *host;
+ int count = RETRY_CONN_MAX;
+
+ /* Try the active connections first; prefer the ones to UNIX sockets. */
+ if ((host = dict_mysql_find_host(PLDB, STATACTIVE, TYPEUNIX)) != NULL ||
+ (host = dict_mysql_find_host(PLDB, STATACTIVE, TYPEINET)) != NULL) {
+ if (msg_verbose)
+ msg_info("%s: found active connection to host %s", myname,
+ host->hostname);
+ return host;
+ }
+
+ /*
+ * Try the remaining hosts. "count" is a safety net, in case the loop
+ * takes more than RETRY_CONN_INTV and the dead hosts are no longer
+ * skipped.
+ */
+ while (--count > 0 &&
+ ((host = dict_mysql_find_host(PLDB, STATUNTRIED | STATFAIL,
+ TYPEUNIX)) != NULL ||
+ (host = dict_mysql_find_host(PLDB, STATUNTRIED | STATFAIL,
+ TYPEINET)) != NULL)) {
+ if (msg_verbose)
+ msg_info("%s: attempting to connect to host %s", myname,
+ host->hostname);
+ plmysql_connect_single(dict_mysql, host);
+ if (host->stat == STATACTIVE)
+ return host;
+ }
+
+ /* bad news... */
+ return 0;
+}
+
+/* dict_mysql_event - callback: close idle connections */
+
+static void dict_mysql_event(int unused_event, void *context)
+{
+ HOST *host = (HOST *) context;
+
+ if (host->db)
+ plmysql_close_host(host);
+}
+
+/*
+ * plmysql_query - process a MySQL query. Return 'true' on success.
+ * On failure, log failure and try other db instances.
+ * on failure of all db instances, return 'false';
+ * close unnecessary active connections
+ */
+
+static int plmysql_query(DICT_MYSQL *dict_mysql,
+ const char *name,
+ VSTRING *query,
+ MYSQL_RES **result)
+{
+ HOST *host;
+ MYSQL_RES *first_result = 0;
+ int query_error;
+
+ /*
+ * Helper to avoid spamming the log with warnings.
+ */
+#define SET_ERROR_AND_WARN_ONCE(err, ...) \
+ do { \
+ if (err == 0) { \
+ err = 1; \
+ msg_warn(__VA_ARGS__); \
+ } \
+ } while (0)
+
+ while ((host = dict_mysql_get_active(dict_mysql)) != NULL) {
+
+#if defined(MYSQL_VERSION_ID) && MYSQL_VERSION_ID >= 40000
+
+ /*
+ * The active host is used to escape strings in the context of the
+ * active connection's character encoding.
+ */
+ dict_mysql->active_host = host;
+ VSTRING_RESET(query);
+ VSTRING_TERMINATE(query);
+ db_common_expand(dict_mysql->ctx, dict_mysql->query,
+ name, 0, query, dict_mysql_quote);
+ dict_mysql->active_host = 0;
+#endif
+
+ query_error = 0;
+ errno = 0;
+
+ /*
+ * The query must complete.
+ */
+ if (mysql_query(host->db, vstring_str(query)) != 0) {
+ query_error = 1;
+ msg_warn("%s:%s: query failed: %s",
+ dict_mysql->dict.type, dict_mysql->dict.name,
+ mysql_error(host->db));
+ }
+
+ /*
+ * Collect all result sets to avoid synchronization errors.
+ */
+ else {
+ int next_res_status;
+
+ do {
+ MYSQL_RES *temp_result;
+
+ /*
+ * Keep the first result set. Reject multiple result sets.
+ */
+ if ((temp_result = mysql_store_result(host->db)) != 0) {
+ if (first_result == 0) {
+ first_result = temp_result;
+ } else {
+ SET_ERROR_AND_WARN_ONCE(query_error,
+ "%s:%s: query failed: multiple result sets "
+ "returning data are not supported",
+ dict_mysql->dict.type,
+ dict_mysql->dict.name);
+ mysql_free_result(temp_result);
+ }
+ }
+
+ /*
+ * No result: the mysql_field_count() function must return 0
+ * to indicate that mysql_store_result() completed normally.
+ */
+ else if (mysql_field_count(host->db) != 0) {
+ SET_ERROR_AND_WARN_ONCE(query_error,
+ "%s:%s: query failed (mysql_store_result): %s",
+ dict_mysql->dict.type,
+ dict_mysql->dict.name,
+ mysql_error(host->db));
+ }
+
+ /*
+ * Are there more results? -1 = no, 0 = yes, > 0 = error.
+ */
+ if ((next_res_status = mysql_next_result(host->db)) > 0) {
+ SET_ERROR_AND_WARN_ONCE(query_error,
+ "%s:%s: query failed (mysql_next_result): %s",
+ dict_mysql->dict.type,
+ dict_mysql->dict.name,
+ mysql_error(host->db));
+ }
+ } while (next_res_status == 0);
+
+ /*
+ * Enforce the require_result_set setting.
+ */
+ if (first_result == 0 && dict_mysql->require_result_set) {
+ SET_ERROR_AND_WARN_ONCE(query_error,
+ "%s:%s: query failed: query returned no result set"
+ "(require_result_set = yes)",
+ dict_mysql->dict.type,
+ dict_mysql->dict.name);
+ }
+ }
+
+ /*
+ * See what we got.
+ */
+ if (query_error) {
+ plmysql_down_host(host);
+ if (errno == 0)
+ errno = ENOTSUP;
+ if (first_result) {
+ mysql_free_result(first_result);
+ first_result = 0;
+ }
+ } else {
+ if (msg_verbose)
+ msg_info("%s:%s: successful query result from host %s",
+ dict_mysql->dict.type, dict_mysql->dict.name,
+ host->hostname);
+ event_request_timer(dict_mysql_event, (void *) host,
+ IDLE_CONN_INTV);
+ break;
+ }
+ }
+
+ *result = first_result;
+ return (query_error == 0);
+}
+
+/*
+ * plmysql_connect_single -
+ * used to reconnect to a single database when one is down or none is
+ * connected yet. Log all errors and set the stat field of host accordingly
+ */
+static void plmysql_connect_single(DICT_MYSQL *dict_mysql, HOST *host)
+{
+ if ((host->db = mysql_init(NULL)) == NULL)
+ msg_fatal("dict_mysql: insufficient memory");
+ if (dict_mysql->option_file)
+ mysql_options(host->db, MYSQL_READ_DEFAULT_FILE, dict_mysql->option_file);
+ if (dict_mysql->option_group && dict_mysql->option_group[0])
+ mysql_options(host->db, MYSQL_READ_DEFAULT_GROUP, dict_mysql->option_group);
+#if defined(MYSQL_VERSION_ID) && MYSQL_VERSION_ID >= 40000
+ if (dict_mysql->tls_key_file || dict_mysql->tls_cert_file ||
+ dict_mysql->tls_CAfile || dict_mysql->tls_CApath || dict_mysql->tls_ciphers)
+ mysql_ssl_set(host->db,
+ dict_mysql->tls_key_file, dict_mysql->tls_cert_file,
+ dict_mysql->tls_CAfile, dict_mysql->tls_CApath,
+ dict_mysql->tls_ciphers);
+#if defined(DICT_MYSQL_SSL_VERIFY_SERVER_CERT)
+ if (dict_mysql->tls_verify_cert != -1)
+ mysql_options(host->db, DICT_MYSQL_SSL_VERIFY_SERVER_CERT,
+ &dict_mysql->tls_verify_cert);
+#endif
+#endif
+ if (mysql_real_connect(host->db,
+ (host->type == TYPEINET ? host->name : 0),
+ dict_mysql->username,
+ dict_mysql->password,
+ dict_mysql->dbname,
+ host->port,
+ (host->type == TYPEUNIX ? host->name : 0),
+ CLIENT_MULTI_RESULTS)) {
+ if (msg_verbose)
+ msg_info("dict_mysql: successful connection to host %s",
+ host->hostname);
+ host->stat = STATACTIVE;
+ } else {
+ msg_warn("connect to mysql server %s: %s",
+ host->hostname, mysql_error(host->db));
+ plmysql_down_host(host);
+ }
+}
+
+/* plmysql_close_host - close an established MySQL connection */
+static void plmysql_close_host(HOST *host)
+{
+ mysql_close(host->db);
+ host->db = 0;
+ host->stat = STATUNTRIED;
+}
+
+/*
+ * plmysql_down_host - close a failed connection AND set a "stay away from
+ * this host" timer
+ */
+static void plmysql_down_host(HOST *host)
+{
+ mysql_close(host->db);
+ host->db = 0;
+ host->ts = time((time_t *) 0) + RETRY_CONN_INTV;
+ host->stat = STATFAIL;
+ event_cancel_timer(dict_mysql_event, (void *) host);
+}
+
+/* mysql_parse_config - parse mysql configuration file */
+
+static void mysql_parse_config(DICT_MYSQL *dict_mysql, const char *mysqlcf)
+{
+ const char *myname = "mysql_parse_config";
+ CFG_PARSER *p = dict_mysql->parser;
+ VSTRING *buf;
+ char *hosts;
+
+ dict_mysql->username = cfg_get_str(p, "user", "", 0, 0);
+ dict_mysql->password = cfg_get_str(p, "password", "", 0, 0);
+ dict_mysql->dbname = cfg_get_str(p, "dbname", "", 1, 0);
+ dict_mysql->result_format = cfg_get_str(p, "result_format", "%s", 1, 0);
+ dict_mysql->option_file = cfg_get_str(p, "option_file", NULL, 0, 0);
+ dict_mysql->option_group = cfg_get_str(p, "option_group", "client", 0, 0);
+#if defined(MYSQL_VERSION_ID) && MYSQL_VERSION_ID >= 40000
+ dict_mysql->tls_key_file = cfg_get_str(p, "tls_key_file", NULL, 0, 0);
+ dict_mysql->tls_cert_file = cfg_get_str(p, "tls_cert_file", NULL, 0, 0);
+ dict_mysql->tls_CAfile = cfg_get_str(p, "tls_CAfile", NULL, 0, 0);
+ dict_mysql->tls_CApath = cfg_get_str(p, "tls_CApath", NULL, 0, 0);
+ dict_mysql->tls_ciphers = cfg_get_str(p, "tls_ciphers", NULL, 0, 0);
+#if defined(DICT_MYSQL_SSL_VERIFY_SERVER_CERT)
+ dict_mysql->tls_verify_cert = cfg_get_bool(p, "tls_verify_cert", -1);
+#endif
+#endif
+ dict_mysql->require_result_set = cfg_get_bool(p, "require_result_set", 1);
+
+ /*
+ * XXX: The default should be non-zero for safety, but that is not
+ * backwards compatible.
+ */
+ dict_mysql->expansion_limit = cfg_get_int(dict_mysql->parser,
+ "expansion_limit", 0, 0, 0);
+
+ if ((dict_mysql->query = cfg_get_str(p, "query", NULL, 0, 0)) == 0) {
+
+ /*
+ * No query specified -- fallback to building it from components (old
+ * style "select %s from %s where %s")
+ */
+ buf = vstring_alloc(64);
+ db_common_sql_build_query(buf, p);
+ dict_mysql->query = vstring_export(buf);
+ }
+
+ /*
+ * Must parse all templates before we can use db_common_expand()
+ */
+ dict_mysql->ctx = 0;
+ (void) db_common_parse(&dict_mysql->dict, &dict_mysql->ctx,
+ dict_mysql->query, 1);
+ (void) db_common_parse(0, &dict_mysql->ctx, dict_mysql->result_format, 0);
+ db_common_parse_domain(p, dict_mysql->ctx);
+
+ /*
+ * Maps that use substring keys should only be used with the full input
+ * key.
+ */
+ if (db_common_dict_partial(dict_mysql->ctx))
+ dict_mysql->dict.flags |= DICT_FLAG_PATTERN;
+ else
+ dict_mysql->dict.flags |= DICT_FLAG_FIXED;
+ if (dict_mysql->dict.flags & DICT_FLAG_FOLD_FIX)
+ dict_mysql->dict.fold_buf = vstring_alloc(10);
+
+ hosts = cfg_get_str(p, "hosts", "", 0, 0);
+
+ dict_mysql->hosts = argv_split(hosts, CHARS_COMMA_SP);
+ if (dict_mysql->hosts->argc == 0) {
+ argv_add(dict_mysql->hosts, "localhost", ARGV_END);
+ argv_terminate(dict_mysql->hosts);
+ if (msg_verbose)
+ msg_info("%s: %s: no hostnames specified, defaulting to '%s'",
+ myname, mysqlcf, dict_mysql->hosts->argv[0]);
+ }
+ myfree(hosts);
+}
+
+/* dict_mysql_open - open MYSQL data base */
+
+DICT *dict_mysql_open(const char *name, int open_flags, int dict_flags)
+{
+ DICT_MYSQL *dict_mysql;
+ CFG_PARSER *parser;
+
+ /*
+ * Sanity checks.
+ */
+ if (open_flags != O_RDONLY)
+ return (dict_surrogate(DICT_TYPE_MYSQL, name, open_flags, dict_flags,
+ "%s:%s map requires O_RDONLY access mode",
+ DICT_TYPE_MYSQL, name));
+
+ /*
+ * Open the configuration file.
+ */
+ if ((parser = cfg_parser_alloc(name)) == 0)
+ return (dict_surrogate(DICT_TYPE_MYSQL, name, open_flags, dict_flags,
+ "open %s: %m", name));
+
+ dict_mysql = (DICT_MYSQL *) dict_alloc(DICT_TYPE_MYSQL, name,
+ sizeof(DICT_MYSQL));
+ dict_mysql->dict.lookup = dict_mysql_lookup;
+ dict_mysql->dict.close = dict_mysql_close;
+ dict_mysql->dict.flags = dict_flags;
+ dict_mysql->parser = parser;
+ mysql_parse_config(dict_mysql, name);
+#if defined(MYSQL_VERSION_ID) && MYSQL_VERSION_ID >= 40000
+ dict_mysql->active_host = 0;
+#endif
+ dict_mysql->pldb = plmysql_init(dict_mysql->hosts);
+ if (dict_mysql->pldb == NULL)
+ msg_fatal("couldn't initialize pldb!\n");
+ dict_mysql->dict.owner = cfg_get_owner(dict_mysql->parser);
+ return (DICT_DEBUG (&dict_mysql->dict));
+}
+
+/*
+ * plmysql_init - initialize a MYSQL database.
+ * Return NULL on failure, or a PLMYSQL * on success.
+ */
+static PLMYSQL *plmysql_init(ARGV *hosts)
+{
+ PLMYSQL *PLDB;
+ int i;
+
+ if ((PLDB = (PLMYSQL *) mymalloc(sizeof(PLMYSQL))) == 0)
+ msg_fatal("mymalloc of pldb failed");
+
+ PLDB->len_hosts = hosts->argc;
+ if ((PLDB->db_hosts = (HOST **) mymalloc(sizeof(HOST *) * hosts->argc)) == 0)
+ return (0);
+ for (i = 0; i < hosts->argc; i++)
+ PLDB->db_hosts[i] = host_init(hosts->argv[i]);
+
+ return PLDB;
+}
+
+
+/* host_init - initialize HOST structure */
+static HOST *host_init(const char *hostname)
+{
+ const char *myname = "mysql host_init";
+ HOST *host = (HOST *) mymalloc(sizeof(HOST));
+ const char *d = hostname;
+ char *s;
+
+ host->db = 0;
+ host->hostname = mystrdup(hostname);
+ host->port = 0;
+ host->stat = STATUNTRIED;
+ host->ts = 0;
+
+ /*
+ * Ad-hoc parsing code. Expect "unix:pathname" or "inet:host:port", where
+ * both "inet:" and ":port" are optional.
+ */
+ if (strncmp(d, "unix:", 5) == 0) {
+ d += 5;
+ host->type = TYPEUNIX;
+ } else {
+ if (strncmp(d, "inet:", 5) == 0)
+ d += 5;
+ host->type = TYPEINET;
+ }
+ host->name = mystrdup(d);
+ if ((s = split_at_right(host->name, ':')) != 0)
+ host->port = ntohs(find_inet_port(s, "tcp"));
+ if (strcasecmp(host->name, "localhost") == 0) {
+ /* The MySQL way: this will actually connect over the UNIX socket */
+ myfree(host->name);
+ host->name = 0;
+ host->type = TYPEUNIX;
+ }
+ if (msg_verbose > 1)
+ msg_info("%s: host=%s, port=%d, type=%s", myname,
+ host->name ? host->name : "localhost",
+ host->port, host->type == TYPEUNIX ? "unix" : "inet");
+ return host;
+}
+
+/* dict_mysql_close - close MYSQL database */
+
+static void dict_mysql_close(DICT *dict)
+{
+ DICT_MYSQL *dict_mysql = (DICT_MYSQL *) dict;
+
+ plmysql_dealloc(dict_mysql->pldb);
+ cfg_parser_free(dict_mysql->parser);
+ myfree(dict_mysql->username);
+ myfree(dict_mysql->password);
+ myfree(dict_mysql->dbname);
+ myfree(dict_mysql->query);
+ myfree(dict_mysql->result_format);
+ if (dict_mysql->option_file)
+ myfree(dict_mysql->option_file);
+ if (dict_mysql->option_group)
+ myfree(dict_mysql->option_group);
+#if defined(MYSQL_VERSION_ID) && MYSQL_VERSION_ID >= 40000
+ if (dict_mysql->tls_key_file)
+ myfree(dict_mysql->tls_key_file);
+ if (dict_mysql->tls_cert_file)
+ myfree(dict_mysql->tls_cert_file);
+ if (dict_mysql->tls_CAfile)
+ myfree(dict_mysql->tls_CAfile);
+ if (dict_mysql->tls_CApath)
+ myfree(dict_mysql->tls_CApath);
+ if (dict_mysql->tls_ciphers)
+ myfree(dict_mysql->tls_ciphers);
+#endif
+ if (dict_mysql->hosts)
+ argv_free(dict_mysql->hosts);
+ if (dict_mysql->ctx)
+ db_common_free_ctx(dict_mysql->ctx);
+ if (dict->fold_buf)
+ vstring_free(dict->fold_buf);
+ dict_free(dict);
+}
+
+/* plmysql_dealloc - free memory associated with PLMYSQL close databases */
+static void plmysql_dealloc(PLMYSQL *PLDB)
+{
+ int i;
+
+ for (i = 0; i < PLDB->len_hosts; i++) {
+ event_cancel_timer(dict_mysql_event, (void *) (PLDB->db_hosts[i]));
+ if (PLDB->db_hosts[i]->db)
+ mysql_close(PLDB->db_hosts[i]->db);
+ myfree(PLDB->db_hosts[i]->hostname);
+ if (PLDB->db_hosts[i]->name)
+ myfree(PLDB->db_hosts[i]->name);
+ myfree((void *) PLDB->db_hosts[i]);
+ }
+ myfree((void *) PLDB->db_hosts);
+ myfree((void *) (PLDB));
+}
+
+#endif