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Refactor nameserverfilter, now uses filter template

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Move most of the functions under the filter or session-classes.
Class definitions moved to a header file. General cleanup. Some features
are still incoming.
This commit is contained in:
Esa Korhonen
2017-03-10 17:19:07 +02:00
parent 32fe220a1b
commit ab7b1c227e
2 changed files with 377 additions and 419 deletions
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680
server/modules/filter/namedserverfilter/namedserverfilter.cc
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@ -30,7 +30,7 @@
#define MXS_MODULE_NAME "namedserverfilter"
#include <maxscale/cppdefs.hh>
#include "namedserverfilter.hh"
#include <stdio.h>
#include <string>
@ -38,107 +38,15 @@
#include <vector>
#include <maxscale/alloc.h>
#include <maxscale/filter.h>
#include <maxscale/hint.h>
#include <maxscale/log_manager.h>
#include <maxscale/modinfo.h>
#include <maxscale/modutil.h>
#include <maxscale/pcre2.hh>
#include <maxscale/utils.h>
using std::string;
class RegexHintInst;
struct RegexHintSess_t;
struct RegexToServers;
typedef std::vector<string> StringArray;
typedef std::vector<RegexToServers> MappingArray;
typedef struct source_host
{
char *address;
struct sockaddr_in ipv4;
int netmask;
} REGEXHINT_SOURCE_HOST;
/**
* Instance structure
*/
class RegexHintInst : public MXS_FILTER
{
private:
string m_user; /* User name to restrict matches */
REGEXHINT_SOURCE_HOST *m_source; /* Source address to restrict matches */
MappingArray m_mapping; /* Regular expression to serverlist mapping */
int m_ovector_size; /* Given to pcre2_match_data_create() */
/* Total statements diverted statistics. Unreliable due to non-locked but
* shared access. */
volatile unsigned int m_total_diverted;
volatile unsigned int m_total_undiverted;
int check_source_host(const char *remote, const struct sockaddr_storage *ip);
public:
RegexHintInst(string user, REGEXHINT_SOURCE_HOST* source, const MappingArray& map,
int ovector_size);
~RegexHintInst();
RegexHintSess_t* newSession(MXS_SESSION *session);
int routeQuery(RegexHintSess_t* session, GWBUF *queue);
void diagnostic(RegexHintSess_t* session, DCB *dcb);
RegexToServers* find_servers(pcre2_match_data* mdata, char* sql, int sql_len);
};
/**
* The session structure for this regexhint filter
*/
typedef struct RegexHintSess_t
{
MXS_DOWNSTREAM down; /* The downstream filter */
int n_diverted; /* No. of statements diverted */
int n_undiverted; /* No. of statements not diverted */
int active; /* Is filter active */
pcre2_match_data *match_data; /* regex result container */
} RegexHintSess;
/* Storage class which maps a regex to a set of servers. Note that this struct
* does not manage the regex memory. That is done by the filter instance. */
struct RegexToServers
{
string m_match; /* Regex in text form */
pcre2_code* m_regex; /* Compiled regex */
StringArray m_servers; /* List of target servers. */
volatile bool m_error_printed; /* Has an error message about
* matching this regex been printed yet? */
RegexToServers(string match, pcre2_code* regex)
: m_match(match),
m_regex(regex),
m_error_printed(false)
{}
int add_servers(string server_names);
};
/* Api entrypoints */
static MXS_FILTER *createInstance(const char *name, char **options, MXS_CONFIG_PARAMETER *params);
static MXS_FILTER_SESSION *newSession(MXS_FILTER *instance, MXS_SESSION *session);
static void closeSession(MXS_FILTER *instance, MXS_FILTER_SESSION *session);
static void freeSession(MXS_FILTER *instance, MXS_FILTER_SESSION *session);
static void setDownstream(MXS_FILTER *instance, MXS_FILTER_SESSION *fsession,
MXS_DOWNSTREAM *downstream);
static int routeQuery(MXS_FILTER *instance, MXS_FILTER_SESSION *fsession, GWBUF *queue);
static void diagnostic(MXS_FILTER *instance, MXS_FILTER_SESSION *fsession, DCB *dcb);
static uint64_t getCapabilities(MXS_FILTER* instance);
/* End entrypoints */
static bool validate_ip_address(const char *);
static REGEXHINT_SOURCE_HOST *set_source_address(const char *);
static void free_instance(RegexHintInst *);
static void generate_param_names(int pairs);
static void form_regex_server_mapping(MXS_CONFIG_PARAMETER* params, int pcre_ops,
MappingArray* mapping, uint32_t* max_capcount_out);
/* These arrays contain the possible config parameter names. */
static StringArray param_names_match;
@ -152,28 +60,8 @@ static const MXS_ENUM_VALUE option_values[] =
{NULL}
};
int RegexToServers::add_servers(string server_names)
{
/* Parse the list, server names separated by ','. Do as in config.c :
* configure_new_service() to stay compatible. We cannot check here
* (at least not easily) if the server is named correctly, since the
* filter doesn't even know its service. */
char servers[server_names.length() + 1];
strcpy(servers, server_names.c_str());
int found = 0;
char *lasts;
char *s = strtok_r(servers, ",", &lasts);
while (s)
{
m_servers.push_back(s);
found++;
s = strtok_r(NULL, ",", &lasts);
}
return found;
}
RegexHintInst::RegexHintInst(string user, REGEXHINT_SOURCE_HOST* source,
const MappingArray& mapping, int ovector_size)
RegexHintFilter::RegexHintFilter(string user, SourceHost* source,
const MappingArray& mapping, int ovector_size)
: m_user(user),
m_source(source),
m_mapping(mapping),
@ -182,8 +70,9 @@ RegexHintInst::RegexHintInst(string user, REGEXHINT_SOURCE_HOST* source,
m_total_undiverted(0)
{}
RegexHintInst::~RegexHintInst()
RegexHintFilter::~RegexHintFilter()
{
delete m_source;
pcre2_code_free(m_regex);
if (m_source)
{
@ -196,41 +85,106 @@ RegexHintInst::~RegexHintInst()
}
}
RegexHintSess_t* RegexHintInst::newSession(MXS_SESSION *session)
RegexHintFSession::RegexHintFSession(MXS_SESSION* session,
RegexHintFilter& fil_inst,
bool active, pcre2_match_data* md)
: maxscale::FilterSession::FilterSession(session),
m_fil_inst(fil_inst),
m_n_diverted(0),
m_n_undiverted(0),
m_active(active),
m_match_data(md)
{}
RegexHintFSession::~RegexHintFSession()
{
RegexHintSess *my_session;
const char *remote, *user;
if ((my_session = (RegexHintSess*)MXS_CALLOC(1, sizeof(RegexHintSess))) != NULL)
{
my_session->n_diverted = 0;
my_session->n_undiverted = 0;
my_session->active = 1;
/* It's best to generate match data from the pattern to avoid extra allocations
* during matching. If data creation fails, matching will fail as well. */
my_session->match_data = pcre2_match_data_create(m_ovector_size, NULL);
/* Check client IP against 'source' host option */
if (m_source && m_source->address &&
(remote = session_get_remote(session)) != NULL)
{
my_session->active =
this->check_source_host(remote, &session->client_dcb->ip);
}
/* Check client user against 'user' option */
if (m_user.length() &&
(user = session_get_user(session)) &&
(user != m_user))
{
my_session->active = 0;
}
}
return my_session;
pcre2_match_data_free(m_match_data);
}
RegexToServers* RegexHintInst::find_servers(pcre2_match_data* match_data,
char* sql, int sql_len)
/**
* If the regular expression configured in the match parameter of the
* filter definition matches the SQL text then add the hint
* "Route to named server" with the name defined in the regex-server mapping
*
* @param queue The query data
* @return 1 on success, 0 on failure
*/
int RegexHintFSession::routeQuery(GWBUF* queue)
{
char* sql = NULL;
int sql_len = 0;
if (modutil_is_SQL(queue) && m_active)
{
if (modutil_extract_SQL(queue, &sql, &sql_len))
{
const RegexToServers* reg_serv =
m_fil_inst.find_servers(m_match_data, sql, sql_len);
if (reg_serv)
{
/* Add the servers in the list to the buffer routing hints */
for (unsigned int i = 0; i < reg_serv->m_servers.size(); i++)
{
queue->hint =
hint_create_route(queue->hint, HINT_ROUTE_TO_NAMED_SERVER,
((reg_serv->m_servers)[i]).c_str());
}
m_n_diverted++;
m_fil_inst.m_total_diverted++;
}
else
{
m_n_undiverted++;
m_fil_inst.m_total_undiverted++;
}
}
}
return m_down.routeQuery(queue);
}
/**
* Associate a new session with this instance of the filter.
*
* @param session The client session to attach to
* @return a new filter session
*/
RegexHintFSession* RegexHintFilter::newSession(MXS_SESSION* session)
{
const char* remote = NULL;
const char* user = NULL;
pcre2_match_data* md = pcre2_match_data_create(m_ovector_size, NULL);
bool session_active = true;
/* Check client IP against 'source' host option */
if (m_source && m_source->m_address &&
(remote = session_get_remote(session)) != NULL)
{
session_active =
check_source_host(remote, &(session->client_dcb->ipv4));
}
/* Check client user against 'user' option */
if (m_user.length() > 0 &&
((user = session_get_user(session)) != NULL) &&
(user != m_user))
{
session_active = false;
}
return new RegexHintFSession(session, *this, session_active, md);
}
/**
* Find the first server list with a matching regural expression.
*
* @param match_data result container, from filter session
* @param sql SQL-query string, not null-terminated
* @paran sql_len length of SQL-query
* @return a set of servers from the main mapping container
*/
const RegexToServers*
RegexHintFilter::find_servers(pcre2_match_data* match_data, char* sql, int sql_len)
{
/* Go through the regex array and find a match. */
for (unsigned int i = 0; i < m_mapping.size(); i++)
@ -258,159 +212,39 @@ RegexToServers* RegexHintInst::find_servers(pcre2_match_data* match_data,
return NULL;
}
int RegexHintInst::routeQuery(RegexHintSess_t* my_session, GWBUF *queue)
{
char *sql = NULL;
int sql_len = 0;
if (modutil_is_SQL(queue) && my_session->active)
{
if (modutil_extract_SQL(queue, &sql, &sql_len))
{
RegexToServers* reg_serv =
find_servers(my_session->match_data, sql, sql_len);
if (reg_serv)
{
/* Add the servers in the list to the buffer routing hints */
for (unsigned int i = 0; i < reg_serv->m_servers.size(); i++)
{
queue->hint =
hint_create_route(queue->hint, HINT_ROUTE_TO_NAMED_SERVER,
((reg_serv->m_servers)[i]).c_str());
}
my_session->n_diverted++;
m_total_diverted++;
}
else
{
my_session->n_undiverted++;
m_total_undiverted++;
}
}
}
return my_session->down.routeQuery(my_session->down.instance,
my_session->down.session, queue);
}
void RegexHintInst::diagnostic(RegexHintSess_t* my_session, DCB *dcb)
{
if (this->m_mapping.size() > 0)
{
dcb_printf(dcb, "\t\tMatches and routes:\n");
}
for (unsigned int i = 0; i < this->m_mapping.size(); i++)
{
dcb_printf(dcb, "\t\t\t/%s/ -> ",
this->m_mapping[i].m_match.c_str());
dcb_printf(dcb, "%s", this->m_mapping[i].m_servers[0].c_str());
for (unsigned int j = 1; j < m_mapping[i].m_servers.size(); j++)
{
dcb_printf(dcb, ", %s", m_mapping[i].m_servers[j].c_str());
}
dcb_printf(dcb, "\n");
}
dcb_printf(dcb, "\t\tTotal no. of queries diverted by filter (approx.): %d\n",
m_total_diverted);
dcb_printf(dcb, "\t\tTotal no. of queries not diverted by filter (approx.): %d\n",
m_total_undiverted);
if (my_session)
{
dcb_printf(dcb, "\t\tNo. of queries diverted by filter: %d\n",
my_session->n_diverted);
dcb_printf(dcb, "\t\tNo. of queries not diverted by filter: %d\n",
my_session->n_undiverted);
}
if (m_source)
{
dcb_printf(dcb,
"\t\tReplacement limited to connections from %s\n",
m_source->address);
}
if (m_user.length())
{
dcb_printf(dcb,
"\t\tReplacement limit to user %s\n",
m_user.c_str());
}
}
/**
* Check whether the client IP
* matches the configured 'source' host
* which can have up to three % wildcards
* Capability routine.
*
* @param remote The clientIP
* @param ipv4 The client IPv4 struct
* @return 1 for match, 0 otherwise
* @return The capabilities of the filter.
*/
int RegexHintInst::check_source_host(const char *remote, const struct sockaddr_storage *ip)
uint64_t RegexHintFilter::getCapabilities()
{
int ret = 0;
struct sockaddr_in check_ipv4;
memcpy(&check_ipv4, ip, sizeof(check_ipv4));
switch (m_source->netmask)
{
case 32:
ret = strcmp(m_source->address, remote) == 0 ? 1 : 0;
break;
case 24:
/* Class C check */
check_ipv4.sin_addr.s_addr &= 0x00FFFFFF;
break;
case 16:
/* Class B check */
check_ipv4.sin_addr.s_addr &= 0x0000FFFF;
break;
case 8:
/* Class A check */
check_ipv4.sin_addr.s_addr &= 0x000000FF;
break;
default:
break;
}
ret = (m_source->netmask < 32) ?
(check_ipv4.sin_addr.s_addr == m_source->ipv4.sin_addr.s_addr) :
ret;
if (ret)
{
MXS_INFO("Client IP %s matches host source %s%s",
remote,
m_source->netmask < 32 ? "with wildcards " : "",
m_source->address);
}
return ret;
return RCAP_TYPE_CONTIGUOUS_INPUT;
}
/**
* Create an instance of the filter for a particular service
* within MaxScale.
* Create an instance of the filter
*
* @param params The array of name/value pair parameters for the filter
* @param name Filter instance name
* @param options The options for this filter
* @param params The array of name/value pair parameters for the filter
*
* @return The instance data for this new instance
* @return The new instance or null on error
*/
static MXS_FILTER*
createInstance(const char *name, char **options, MXS_CONFIG_PARAMETER *params)
RegexHintFilter*
RegexHintFilter::create(const char* name, char** options, MXS_CONFIG_PARAMETER* params)
{
bool error = false;
REGEXHINT_SOURCE_HOST* source = NULL;
SourceHost* source_host = NULL;
/* The cfg_param cannot be changed to string because set_source_address doesn't
copy the contents. This inefficient as the config string searching */
const char *cfg_param = config_get_string(params, "source");
if (*cfg_param)
const char* source = config_get_string(params, "source");
if (*source)
{
source = set_source_address(cfg_param);
if (!source)
source_host = set_source_address(source);
if (!source_host)
{
MXS_ERROR("Failure setting 'source' from %s", cfg_param);
MXS_ERROR("Failure setting 'source' from %s", source);
error = true;
}
}
@ -422,149 +256,115 @@ createInstance(const char *name, char **options, MXS_CONFIG_PARAMETER *params)
if (!mapping.size() || error)
{
MXS_FREE(source);
delete source_host;
return NULL;
}
else
{
RegexHintInst* instance = NULL;
RegexHintFilter* instance = NULL;
string user(config_get_string(params, "user"));
MXS_EXCEPTION_GUARD(instance =
new RegexHintInst(user, source, mapping, max_capcount + 1));
new RegexHintFilter(user, source_host, mapping, max_capcount + 1));
return instance;
}
}
/**
* Associate a new session with this instance of the filter.
* Diagnostics routine
*
* @param instance The filter instance data
* @param session The session itself
* @return Session specific data for this session
* Print diagnostics on the filter instance as a whole + session-specific info.
*
* @param dcb The DCB for diagnostic output
*/
static MXS_FILTER_SESSION *
newSession(MXS_FILTER *instance, MXS_SESSION *session)
void RegexHintFSession::diagnostics(DCB* dcb)
{
RegexHintInst* my_instance = static_cast<RegexHintInst*>(instance);
RegexHintSess* my_session = NULL;
MXS_EXCEPTION_GUARD(my_session = my_instance->newSession(session));
return (MXS_FILTER_SESSION*)my_session;
}
/**
* Close a session with the filter, this is the mechanism
* by which a filter may cleanup data structure etc.
*
* @param instance The filter instance data
* @param session The session being closed
*/
static void
closeSession(MXS_FILTER *instance, MXS_FILTER_SESSION *session)
{
}
/**
* Free the memory associated with this filter session.
*
* @param instance The filter instance data
* @param session The session being closed
*/
static void
freeSession(MXS_FILTER *instance, MXS_FILTER_SESSION *session)
{
RegexHintSess_t* my_session = (RegexHintSess_t*)session;
pcre2_match_data_free(my_session->match_data);
MXS_FREE(my_session);
return;
}
/**
* Set the downstream component for this filter.
*
* @param instance The filter instance data
* @param session The session being closed
* @param downstream The downstream filter or router
*/
static void
setDownstream(MXS_FILTER *instance, MXS_FILTER_SESSION *session, MXS_DOWNSTREAM *downstream)
{
RegexHintSess *my_session = (RegexHintSess *) session;
my_session->down = *downstream;
}
/**
* The routeQuery entry point. This is passed the query buffer
* to which the filter should be applied. Once applied the
* query should normally be passed to the downstream component
* (filter or router) in the filter chain.
*
* If the regular expressed configured in the match parameter of the
* filter definition matches the SQL text then add the hint
* "Route to named server" with the name defined in the server parameter
*
* @param instance The filter instance data
* @param session The filter session
* @param queue The query data
*/
static int
routeQuery(MXS_FILTER *instance, MXS_FILTER_SESSION *session, GWBUF *queue)
{
RegexHintInst *my_instance = static_cast<RegexHintInst*>(instance);
RegexHintSess *my_session = (RegexHintSess *) session;
int rval = 0;
MXS_EXCEPTION_GUARD(rval = my_instance->routeQuery(my_session, queue));
return rval;
m_fil_inst.diagnostics(dcb); /* Print overall diagnostics */
dcb_printf(dcb, "\t\tNo. of queries diverted by filter (session): %d\n",
m_n_diverted);
dcb_printf(dcb, "\t\tNo. of queries not diverted by filter (session): %d\n",
m_n_undiverted);
}
/**
* Diagnostics routine
*
* If fsession is NULL then print diagnostics on the filter
* instance as a whole, otherwise print diagnostics for the
* particular session.
* Print diagnostics on the filter instance as a whole.
*
* @param instance The filter instance
* @param fsession Filter session, may be NULL
* @param dcb The DCB for diagnostic output
*/
static void
diagnostic(MXS_FILTER *instance, MXS_FILTER_SESSION *fsession, DCB *dcb)
void RegexHintFilter::diagnostics(DCB* dcb)
{
RegexHintInst *my_instance = static_cast<RegexHintInst*>(instance);
RegexHintSess *my_session = (RegexHintSess *) fsession;
my_instance->diagnostic(my_session, dcb);
if (m_mapping.size() > 0)
{
dcb_printf(dcb, "\t\tMatches and routes:\n");
}
for (unsigned int i = 0; i < m_mapping.size(); i++)
{
dcb_printf(dcb, "\t\t\t/%s/ -> ",
m_mapping[i].m_match.c_str());
dcb_printf(dcb, "%s", m_mapping[i].m_servers[0].c_str());
for (unsigned int j = 1; j < m_mapping[i].m_servers.size(); j++)
{
dcb_printf(dcb, ", %s", m_mapping[i].m_servers[j].c_str());
}
dcb_printf(dcb, "\n");
}
dcb_printf(dcb, "\t\tTotal no. of queries diverted by filter (approx.): %d\n",
m_total_diverted);
dcb_printf(dcb, "\t\tTotal no. of queries not diverted by filter (approx.): %d\n",
m_total_undiverted);
if (m_source)
{
dcb_printf(dcb,
"\t\tReplacement limited to connections from %s\n",
m_source->m_address);
}
if (m_user.length())
{
dcb_printf(dcb,
"\t\tReplacement limit to user %s\n",
m_user.c_str());
}
}
/**
* Capability routine.
* Parse the server list and add the contained servers to the struct's internal
* list. Server names are not verified to be valid servers.
*
* @return The capabilities of the filter.
* @param server_names The list of servers as read from the config file
* @return How many were found
*/
static uint64_t getCapabilities(MXS_FILTER* instance)
int RegexToServers::add_servers(string server_names)
{
return RCAP_TYPE_CONTIGUOUS_INPUT;
}
/**
* Free allocated memory
*
* @param instance The filter instance
*/
static void free_instance(MXS_FILTER* instance)
{
RegexHintInst *my_instance = static_cast<RegexHintInst*>(instance);
MXS_EXCEPTION_GUARD(delete my_instance);
/* Parse the list, server names separated by ','. Do as in config.c :
* configure_new_service() to stay compatible. We cannot check here
* (at least not easily) if the server is named correctly, since the
* filter doesn't even know its service. */
char servers[server_names.length() + 1];
strcpy(servers, server_names.c_str());
int found = 0;
char* lasts;
char* s = strtok_r(servers, ",", &lasts);
while (s)
{
m_servers.push_back(s);
found++;
s = strtok_r(NULL, ",", &lasts);
}
return found;
}
/**
* Read all regexes from the supplied configuration, compile them and form the mapping
*
* @param mapping An array of regex->serverList mappings for filling in. Is cleared on error.
* @param mapping An array of regex->serverlist mappings for filling in. Is cleared on error.
* @param pcre_ops options for pcre2_compile
* @param params config parameters
*/
static void form_regex_server_mapping(MXS_CONFIG_PARAMETER* params, int pcre_ops,
MappingArray* mapping, uint32_t* max_capcount_out)
void RegexHintFilter::form_regex_server_mapping(MXS_CONFIG_PARAMETER* params, int pcre_ops,
MappingArray* mapping, uint32_t* max_capcount_out)
{
ss_dassert(param_names_match.size() == param_names_server.size());
bool error = false;
@ -661,6 +461,58 @@ static void form_regex_server_mapping(MXS_CONFIG_PARAMETER* params, int pcre_ops
}
}
/**
* Check whether the client IP
* matches the configured 'source' host
* which can have up to three % wildcards
*
* @param remote The clientIP
* @param ipv4 The client IPv4 struct
* @return 1 for match, 0 otherwise
*/
int RegexHintFilter::check_source_host(const char* remote, const struct sockaddr_in* ipv4)
{
int ret = 0;
struct sockaddr_in check_ipv4;
memcpy(&check_ipv4, ipv4, sizeof(check_ipv4));
switch (m_source->m_netmask)
{
case 32:
ret = strcmp(m_source->m_address, remote) == 0 ? 1 : 0;
break;
case 24:
/* Class C check */
check_ipv4.sin_addr.s_addr &= 0x00FFFFFF;
break;
case 16:
/* Class B check */
check_ipv4.sin_addr.s_addr &= 0x0000FFFF;
break;
case 8:
/* Class A check */
check_ipv4.sin_addr.s_addr &= 0x000000FF;
break;
default:
break;
}
ret = (m_source->m_netmask < 32) ?
(check_ipv4.sin_addr.s_addr == m_source->m_ipv4.sin_addr.s_addr) :
ret;
if (ret)
{
MXS_INFO("Client IP %s matches host source %s%s",
remote,
m_source->m_netmask < 32 ? "with wildcards " : "",
m_source->m_address);
}
return ret;
}
/**
* Validate IP address string againt three dots
* and last char not being a dot.
@ -668,7 +520,7 @@ static void form_regex_server_mapping(MXS_CONFIG_PARAMETER* params, int pcre_ops
* Match any, '%' or '%.%.%.%', is not allowed
*
*/
static bool validate_ip_address(const char *host)
bool RegexHintFilter::validate_ip_address(const char* host)
{
int n_dots = 0;
@ -725,39 +577,42 @@ static bool validate_ip_address(const char *host)
* @return The filled struct with netmask
*
*/
static REGEXHINT_SOURCE_HOST *set_source_address(const char *input_host)
SourceHost* RegexHintFilter::set_source_address(const char* input_host)
{
ss_dassert(input_host);
int netmask = 32;
int bytes = 0;
REGEXHINT_SOURCE_HOST *source_host =
(REGEXHINT_SOURCE_HOST*)MXS_CALLOC(1, sizeof(REGEXHINT_SOURCE_HOST));
struct sockaddr_in serv_addr;
if (!source_host)
if (!input_host)
{
return NULL;
}
SourceHost* source_host = new SourceHost();
if (!validate_ip_address(input_host))
{
MXS_WARNING("The given 'source' parameter '%s'"
" is not a valid IPv4 address.", input_host);
MXS_FREE(source_host);
return NULL;
MXS_WARNING("The given 'source' parameter source=%s"
" is not a valid IP address: it will not be used.",
input_host);
source_host->m_address = NULL;
return source_host;
}
source_host->address = MXS_STRDUP_A(input_host);
source_host->m_address = input_host;
/* If no wildcards don't check it, set netmask to 32 and return */
if (!strchr(input_host, '%'))
{
source_host->netmask = netmask;
source_host->m_netmask = netmask;
return source_host;
}
char format_host[strlen(input_host) + 1];
char *p = (char *)input_host;
char *out = format_host;
char* p = (char*)input_host;
char* out = format_host;
while (*p && bytes <= 3)
{
@ -781,7 +636,7 @@ static REGEXHINT_SOURCE_HOST *set_source_address(const char *input_host)
}
*out = '\0';
source_host->netmask = netmask;
source_host->m_netmask = netmask;
struct addrinfo *ai = NULL, hint = {};
hint.ai_flags = AI_ADDRCONFIG | AI_V4MAPPED;
@ -794,10 +649,10 @@ static REGEXHINT_SOURCE_HOST *set_source_address(const char *input_host)
memcpy(&source_host->ipv4, ai->ai_addr, ai->ai_addrlen);
/* if netmask < 32 there are % wildcards */
if (source_host->netmask < 32)
if (source_host->m_netmask < 32)
{
/* let's zero the last IP byte: a.b.c.0 we may have set above to 1*/
source_host->ipv4.sin_addr.s_addr &= 0x00FFFFFF;
source_host->m_ipv4.sin_addr.s_addr &= 0x00FFFFFF;
}
MXS_INFO("Input %s is valid with netmask %d", source_host->address, source_host->netmask);
@ -812,7 +667,7 @@ static REGEXHINT_SOURCE_HOST *set_source_address(const char *input_host)
return NULL;
}
return (REGEXHINT_SOURCE_HOST *)source_host;
return source_host;
}
/**
@ -825,20 +680,7 @@ static REGEXHINT_SOURCE_HOST *set_source_address(const char *input_host)
*/
extern "C" MXS_MODULE* MXS_CREATE_MODULE()
{
static MXS_FILTER_OBJECT MyObject =
{
createInstance,
newSession,
closeSession,
freeSession,
setDownstream,
NULL, // No Upstream requirement
routeQuery,
NULL, // No clientReply
diagnostic,
getCapabilities,
free_instance, // No destroyInstance
};
static MXS_FILTER_OBJECT MyObject = RegexHintFilter::s_object;
static MXS_MODULE info =
{

116
server/modules/filter/namedserverfilter/namedserverfilter.hh Normal file
View File

@ -0,0 +1,116 @@
#pragma once
/*
* Copyright (c) 2016 MariaDB Corporation Ab
*
* Use of this software is governed by the Business Source License included
* in the LICENSE.TXT file and at www.mariadb.com/bsl.
*
* Change Date: 2019-07-01
*
* On the date above, in accordance with the Business Source License, use
* of this software will be governed by version 2 or later of the General
* Public License.
*/
#include <maxscale/cppdefs.hh>
#include <string>
#include <vector>
#include <maxscale/filter.hh>
#include <maxscale/buffer.hh>
#include <maxscale/pcre2.hh>
class RegexHintFilter;
class RegexHintFSession;
struct RegexToServers;
struct SourceHost;
using std::string;
typedef std::vector<string> StringArray;
typedef std::vector<RegexToServers> MappingArray;
/**
* Filter instance definition
*/
class RegexHintFilter : public maxscale::Filter<RegexHintFilter, RegexHintFSession>
{
private:
const string m_user; /* User name to restrict matches with */
SourceHost* m_source; /* Source address to restrict matches */
MappingArray m_mapping; /* Regular expression to serverlist mapping */
const int m_ovector_size; /* Given to pcre2_match_data_create() */
int check_source_host(const char *remote, const struct sockaddr_in *ipv4);
public:
/* Total statements diverted statistics. Unreliable due to lockless yet
* shared access. */
volatile unsigned int m_total_diverted;
volatile unsigned int m_total_undiverted;
RegexHintFilter(string user, SourceHost* source, const MappingArray& map,
int ovector_size);
~RegexHintFilter();
static RegexHintFilter* create(const char* zName, char** pzOptions,
MXS_CONFIG_PARAMETER* ppParams);
RegexHintFSession* newSession(MXS_SESSION *session);
void diagnostics(DCB* dcb);
uint64_t getCapabilities();
const RegexToServers* find_servers(pcre2_match_data* mdata, char* sql, int sql_len);
static void form_regex_server_mapping(MXS_CONFIG_PARAMETER* params, int pcre_ops,
MappingArray* mapping, uint32_t* max_capcount_out);
static bool validate_ip_address(const char *);
static SourceHost* set_source_address(const char *);
};
/**
* The session structure for the regexhint (namedserver) filter
*/
class RegexHintFSession : public maxscale::FilterSession
{
private:
MXS_SESSION* m_session; /* The main client session */
RegexHintFilter& m_fil_inst; /* Filter instance */
int m_n_diverted; /* No. of statements diverted */
int m_n_undiverted; /* No. of statements not diverted */
int m_active; /* Is filter active? */
pcre2_match_data *m_match_data; /* compiled regex */
public:
RegexHintFSession(MXS_SESSION* session, RegexHintFilter& filter, bool active,
pcre2_match_data* md);
~RegexHintFSession();
void diagnostics(DCB* pDcb);
int routeQuery(GWBUF* buffer);
};
/* Storage class which maps a regex to a set of servers. Note that this struct
* does not manage the regex memory. That is done by the filter instance. */
struct RegexToServers
{
string m_match; /* Regex in text form */
pcre2_code* m_regex; /* Compiled regex */
StringArray m_servers; /* List of target servers. */
volatile bool m_error_printed; /* Has an error message about
* matching this regex been printed yet? */
RegexToServers(string match, pcre2_code* regex)
: m_match(match),
m_regex(regex),
m_error_printed(false)
{}
int add_servers(string server_names);
};
/* Container for address-specific filtering */
struct SourceHost
{
const char *m_address;
struct sockaddr_in m_ipv4;
int m_netmask;
SourceHost()
: m_address(NULL)
{};
};