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tcp_rules.c
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/*
* "tcp" rules processing
*
* Copyright 2000-2016 Willy Tarreau <w@1wt.eu>
*
* 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
* 2 of the License, or (at your option) any later version.
*
*/
#include <haproxy/acl.h>
#include <haproxy/action.h>
#include <haproxy/api.h>
#include <haproxy/arg-t.h>
#include <haproxy/capture-t.h>
#include <haproxy/cfgparse.h>
#include <haproxy/channel.h>
#include <haproxy/connection.h>
#include <haproxy/global.h>
#include <haproxy/list.h>
#include <haproxy/log.h>
#include <haproxy/proxy.h>
#include <haproxy/sample.h>
#include <haproxy/sc_strm.h>
#include <haproxy/stconn.h>
#include <haproxy/stick_table.h>
#include <haproxy/stream-t.h>
#include <haproxy/tcp_rules.h>
#include <haproxy/ticks.h>
#include <haproxy/tools.h>
#include <haproxy/trace.h>
#define TRACE_SOURCE &trace_strm
/* List head of all known action keywords for "tcp-request connection" */
struct list tcp_req_conn_keywords = LIST_HEAD_INIT(tcp_req_conn_keywords);
struct list tcp_req_sess_keywords = LIST_HEAD_INIT(tcp_req_sess_keywords);
struct list tcp_req_cont_keywords = LIST_HEAD_INIT(tcp_req_cont_keywords);
struct list tcp_res_cont_keywords = LIST_HEAD_INIT(tcp_res_cont_keywords);
/*
* Register keywords.
*/
void tcp_req_conn_keywords_register(struct action_kw_list *kw_list)
{
LIST_APPEND(&tcp_req_conn_keywords, &kw_list->list);
}
void tcp_req_sess_keywords_register(struct action_kw_list *kw_list)
{
LIST_APPEND(&tcp_req_sess_keywords, &kw_list->list);
}
void tcp_req_cont_keywords_register(struct action_kw_list *kw_list)
{
LIST_APPEND(&tcp_req_cont_keywords, &kw_list->list);
}
void tcp_res_cont_keywords_register(struct action_kw_list *kw_list)
{
LIST_APPEND(&tcp_res_cont_keywords, &kw_list->list);
}
/*
* Return the struct tcp_req_action_kw associated to a keyword.
*/
struct action_kw *tcp_req_conn_action(const char *kw)
{
return action_lookup(&tcp_req_conn_keywords, kw);
}
struct action_kw *tcp_req_sess_action(const char *kw)
{
return action_lookup(&tcp_req_sess_keywords, kw);
}
struct action_kw *tcp_req_cont_action(const char *kw)
{
return action_lookup(&tcp_req_cont_keywords, kw);
}
struct action_kw *tcp_res_cont_action(const char *kw)
{
return action_lookup(&tcp_res_cont_keywords, kw);
}
/* This function performs the TCP request analysis on the current request. It
* returns 1 if the processing can continue on next analysers, or zero if it
* needs more data, encounters an error, or wants to immediately abort the
* request. It relies on buffers flags, and updates s->req->analysers. The
* function may be called for frontend rules and backend rules. It only relies
* on the backend pointer so this works for both cases.
*/
int tcp_inspect_request(struct stream *s, struct channel *req, int an_bit)
{
struct list *def_rules, *rules;
struct session *sess = s->sess;
struct act_rule *rule;
int partial;
int act_opts = 0;
DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
def_rules = ((s->be->defpx &&
(sess->fe->mode == PR_MODE_TCP || sess->fe->mode == PR_MODE_HTTP) &&
(an_bit == AN_REQ_INSPECT_FE || s->be->defpx != sess->fe->defpx)) ? &s->be->defpx->tcp_req.inspect_rules : NULL);
rules = &s->be->tcp_req.inspect_rules;
/* We don't know whether we have enough data, so must proceed
* this way :
* - iterate through all rules in their declaration order
* - if one rule returns MISS, it means the inspect delay is
* not over yet, then return immediately, otherwise consider
* it as a non-match.
* - if one rule returns OK, then return OK
* - if one rule returns KO, then return KO
*/
if ((s->scf->flags & (SC_FL_EOS|SC_FL_ABRT_DONE)) || channel_full(req, global.tune.maxrewrite) ||
sc_waiting_room(s->scf) ||
!s->be->tcp_req.inspect_delay || tick_is_expired(s->rules_exp, now_ms)) {
partial = SMP_OPT_FINAL;
/* Action may yield while the inspect_delay is not expired and there is no read error */
if ((s->scf->flags & SC_FL_ERROR) || !s->be->tcp_req.inspect_delay || tick_is_expired(s->rules_exp, now_ms))
act_opts |= ACT_OPT_FINAL;
}
else
partial = 0;
/* If "the current_rule_list" match the executed rule list, we are in
* resume condition. If a resume is needed it is always in the action
* and never in the ACL or converters. In this case, we initialise the
* current rule, and go to the action execution point.
*/
if (s->current_rule) {
rule = s->current_rule;
s->current_rule = NULL;
if ((def_rules && s->current_rule_list == def_rules) || s->current_rule_list == rules)
goto resume_execution;
}
s->current_rule_list = ((!def_rules || s->current_rule_list == def_rules) ? rules : def_rules);
restart:
list_for_each_entry(rule, s->current_rule_list, list) {
enum acl_test_res ret = ACL_TEST_PASS;
if (rule->cond) {
ret = acl_exec_cond(rule->cond, s->be, sess, s, SMP_OPT_DIR_REQ | partial);
if (ret == ACL_TEST_MISS)
goto missing_data;
ret = acl_pass(ret);
if (rule->cond->pol == ACL_COND_UNLESS)
ret = !ret;
}
if (ret) {
act_opts |= ACT_OPT_FIRST;
resume_execution:
/* Always call the action function if defined */
if (rule->action_ptr) {
switch (rule->action_ptr(rule, s->be, s->sess, s, act_opts)) {
case ACT_RET_CONT:
break;
case ACT_RET_STOP:
case ACT_RET_DONE:
s->last_rule_file = rule->conf.file;
s->last_rule_line = rule->conf.line;
goto end;
case ACT_RET_YIELD:
s->current_rule = rule;
if (act_opts & ACT_OPT_FINAL) {
send_log(s->be, LOG_WARNING,
"Internal error: yield not allowed if the inspect-delay expired "
"for the tcp-request content actions.");
goto internal;
}
goto missing_data;
case ACT_RET_DENY:
s->last_rule_file = rule->conf.file;
s->last_rule_line = rule->conf.line;
goto deny;
case ACT_RET_ABRT:
s->last_rule_file = rule->conf.file;
s->last_rule_line = rule->conf.line;
goto abort;
case ACT_RET_ERR:
s->last_rule_file = rule->conf.file;
s->last_rule_line = rule->conf.line;
goto internal;
case ACT_RET_INV:
s->last_rule_file = rule->conf.file;
s->last_rule_line = rule->conf.line;
goto invalid;
}
continue; /* eval the next rule */
}
/* If not action function defined, check for known actions */
if (rule->action == ACT_ACTION_ALLOW) {
s->last_rule_file = rule->conf.file;
s->last_rule_line = rule->conf.line;
goto end;
}
else if (rule->action == ACT_ACTION_DENY) {
s->last_rule_file = rule->conf.file;
s->last_rule_line = rule->conf.line;
goto deny;
}
}
}
if (def_rules && s->current_rule_list == def_rules) {
s->current_rule_list = rules;
goto restart;
}
end:
/* if we get there, it means we have no rule which matches, or
* we have an explicit accept, so we apply the default accept.
*/
req->analysers &= ~an_bit;
s->current_rule = s->current_rule_list = NULL;
req->analyse_exp = s->rules_exp = TICK_ETERNITY;
DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
return 1;
missing_data:
channel_dont_connect(req);
/* just set the request timeout once at the beginning of the request */
if (!tick_isset(s->rules_exp) && s->be->tcp_req.inspect_delay)
s->rules_exp = tick_add(now_ms, s->be->tcp_req.inspect_delay);
req->analyse_exp = tick_first((tick_is_expired(req->analyse_exp, now_ms) ? 0 : req->analyse_exp), s->rules_exp);
DBG_TRACE_DEVEL("waiting for more data", STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
return 0;
deny:
_HA_ATOMIC_INC(&sess->fe->fe_counters.denied_req);
if (sess->listener && sess->listener->counters)
_HA_ATOMIC_INC(&sess->listener->counters->denied_req);
goto reject;
internal:
_HA_ATOMIC_INC(&sess->fe->fe_counters.internal_errors);
if (sess->listener && sess->listener->counters)
_HA_ATOMIC_INC(&sess->listener->counters->internal_errors);
if (!(s->flags & SF_ERR_MASK))
s->flags |= SF_ERR_INTERNAL;
goto reject;
invalid:
_HA_ATOMIC_INC(&sess->fe->fe_counters.failed_req);
if (sess->listener && sess->listener->counters)
_HA_ATOMIC_INC(&sess->listener->counters->failed_req);
reject:
sc_must_kill_conn(s->scf);
stream_abort(s);
abort:
req->analysers &= AN_REQ_FLT_END;
s->current_rule = s->current_rule_list = NULL;
req->analyse_exp = s->rules_exp = TICK_ETERNITY;
if (!(s->flags & SF_ERR_MASK))
s->flags |= SF_ERR_PRXCOND;
if (!(s->flags & SF_FINST_MASK))
s->flags |= SF_FINST_R;
DBG_TRACE_DEVEL("leaving on error|deny|abort", STRM_EV_STRM_ANA|STRM_EV_TCP_ANA|STRM_EV_TCP_ERR, s);
return 0;
}
/* This function performs the TCP response analysis on the current response. It
* returns 1 if the processing can continue on next analysers, or zero if it
* needs more data, encounters an error, or wants to immediately abort the
* response. It relies on buffers flags, and updates s->rep->analysers. The
* function may be called for backend rules.
*/
int tcp_inspect_response(struct stream *s, struct channel *rep, int an_bit)
{
struct list *def_rules, *rules;
struct session *sess = s->sess;
struct act_rule *rule;
int partial;
int act_opts = 0;
DBG_TRACE_ENTER(STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
def_rules = (s->be->defpx && (s->be->mode == PR_MODE_TCP || s->be->mode == PR_MODE_HTTP) ? &s->be->defpx->tcp_rep.inspect_rules : NULL);
rules = &s->be->tcp_rep.inspect_rules;
/* We don't know whether we have enough data, so must proceed
* this way :
* - iterate through all rules in their declaration order
* - if one rule returns MISS, it means the inspect delay is
* not over yet, then return immediately, otherwise consider
* it as a non-match.
* - if one rule returns OK, then return OK
* - if one rule returns KO, then return KO
*/
if ((s->scb->flags & (SC_FL_EOS|SC_FL_ABRT_DONE)) || channel_full(rep, global.tune.maxrewrite) ||
sc_waiting_room(s->scb) ||
!s->be->tcp_rep.inspect_delay || tick_is_expired(s->rules_exp, now_ms)) {
partial = SMP_OPT_FINAL;
/* Action may yield while the inspect_delay is not expired and there is no read error */
if ((s->scb->flags & SC_FL_ERROR) || !s->be->tcp_rep.inspect_delay || tick_is_expired(s->rules_exp, now_ms))
act_opts |= ACT_OPT_FINAL;
}
else
partial = 0;
/* If "the current_rule_list" match the executed rule list, we are in
* resume condition. If a resume is needed it is always in the action
* and never in the ACL or converters. In this case, we initialise the
* current rule, and go to the action execution point.
*/
if (s->current_rule) {
rule = s->current_rule;
s->current_rule = NULL;
if ((def_rules && s->current_rule_list == def_rules) || s->current_rule_list == rules)
goto resume_execution;
}
s->current_rule_list = ((!def_rules || s->current_rule_list == def_rules) ? rules : def_rules);
restart:
list_for_each_entry(rule, s->current_rule_list, list) {
enum acl_test_res ret = ACL_TEST_PASS;
if (rule->cond) {
ret = acl_exec_cond(rule->cond, s->be, sess, s, SMP_OPT_DIR_RES | partial);
if (ret == ACL_TEST_MISS)
goto missing_data;
ret = acl_pass(ret);
if (rule->cond->pol == ACL_COND_UNLESS)
ret = !ret;
}
if (ret) {
act_opts |= ACT_OPT_FIRST;
resume_execution:
/* Always call the action function if defined */
if (rule->action_ptr) {
switch (rule->action_ptr(rule, s->be, s->sess, s, act_opts)) {
case ACT_RET_CONT:
break;
case ACT_RET_STOP:
case ACT_RET_DONE:
s->last_rule_file = rule->conf.file;
s->last_rule_line = rule->conf.line;
goto end;
case ACT_RET_YIELD:
s->current_rule = rule;
if (act_opts & ACT_OPT_FINAL) {
send_log(s->be, LOG_WARNING,
"Internal error: yield not allowed if the inspect-delay expired "
"for the tcp-response content actions.");
goto internal;
}
channel_dont_close(rep);
goto missing_data;
case ACT_RET_DENY:
s->last_rule_file = rule->conf.file;
s->last_rule_line = rule->conf.line;
goto deny;
case ACT_RET_ABRT:
s->last_rule_file = rule->conf.file;
s->last_rule_line = rule->conf.line;
goto abort;
case ACT_RET_ERR:
s->last_rule_file = rule->conf.file;
s->last_rule_line = rule->conf.line;
goto internal;
case ACT_RET_INV:
s->last_rule_file = rule->conf.file;
s->last_rule_line = rule->conf.line;
goto invalid;
}
continue; /* eval the next rule */
}
/* If not action function defined, check for known actions */
if (rule->action == ACT_ACTION_ALLOW) {
s->last_rule_file = rule->conf.file;
s->last_rule_line = rule->conf.line;
goto end;
}
else if (rule->action == ACT_ACTION_DENY) {
s->last_rule_file = rule->conf.file;
s->last_rule_line = rule->conf.line;
goto deny;
}
else if (rule->action == ACT_TCP_CLOSE) {
s->scb->flags |= SC_FL_NOLINGER | SC_FL_NOHALF;
sc_must_kill_conn(s->scb);
sc_abort(s->scb);
sc_shutdown(s->scb);
s->last_rule_file = rule->conf.file;
s->last_rule_line = rule->conf.line;
goto end;
}
}
}
if (def_rules && s->current_rule_list == def_rules) {
s->current_rule_list = rules;
goto restart;
}
end:
/* if we get there, it means we have no rule which matches, or
* we have an explicit accept, so we apply the default accept.
*/
rep->analysers &= ~an_bit;
s->current_rule = s->current_rule_list = NULL;
rep->analyse_exp = s->rules_exp = TICK_ETERNITY;
DBG_TRACE_LEAVE(STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
return 1;
missing_data:
/* just set the analyser timeout once at the beginning of the response */
if (!tick_isset(s->rules_exp) && s->be->tcp_rep.inspect_delay)
s->rules_exp = tick_add(now_ms, s->be->tcp_rep.inspect_delay);
rep->analyse_exp = tick_first((tick_is_expired(rep->analyse_exp, now_ms) ? 0 : rep->analyse_exp), s->rules_exp);
DBG_TRACE_DEVEL("waiting for more data", STRM_EV_STRM_ANA|STRM_EV_TCP_ANA, s);
return 0;
deny:
_HA_ATOMIC_INC(&s->sess->fe->fe_counters.denied_resp);
_HA_ATOMIC_INC(&s->be->be_counters.denied_resp);
if (s->sess->listener && s->sess->listener->counters)
_HA_ATOMIC_INC(&s->sess->listener->counters->denied_resp);
if (objt_server(s->target))
_HA_ATOMIC_INC(&__objt_server(s->target)->counters.denied_resp);
goto reject;
internal:
_HA_ATOMIC_INC(&s->sess->fe->fe_counters.internal_errors);
_HA_ATOMIC_INC(&s->be->be_counters.internal_errors);
if (s->sess->listener && s->sess->listener->counters)
_HA_ATOMIC_INC(&s->sess->listener->counters->internal_errors);
if (objt_server(s->target))
_HA_ATOMIC_INC(&__objt_server(s->target)->counters.internal_errors);
if (!(s->flags & SF_ERR_MASK))
s->flags |= SF_ERR_INTERNAL;
goto reject;
invalid:
_HA_ATOMIC_INC(&s->be->be_counters.failed_resp);
if (objt_server(s->target))
_HA_ATOMIC_INC(&__objt_server(s->target)->counters.failed_resp);
reject:
sc_must_kill_conn(s->scb);
stream_abort(s);
abort:
rep->analysers &= AN_RES_FLT_END;
s->current_rule = s->current_rule_list = NULL;
rep->analyse_exp = s->rules_exp = TICK_ETERNITY;
if (!(s->flags & SF_ERR_MASK))
s->flags |= SF_ERR_PRXCOND;
if (!(s->flags & SF_FINST_MASK))
s->flags |= SF_FINST_D;
DBG_TRACE_DEVEL("leaving on error", STRM_EV_STRM_ANA|STRM_EV_TCP_ANA|STRM_EV_TCP_ERR, s);
return 0;
}
/* This function performs the TCP layer4 analysis on the current request. It
* returns 0 if a reject rule matches, otherwise 1 if either an accept rule
* matches or if no more rule matches. It can only use rules which don't need
* any data. This only works on connection-based client-facing stream connectors.
*/
int tcp_exec_l4_rules(struct session *sess)
{
struct proxy *px = sess->fe;
struct act_rule *rule;
struct connection *conn = objt_conn(sess->origin);
int result = 1;
enum acl_test_res ret;
if (!conn)
return result;
if (sess->fe->defpx && (sess->fe->mode == PR_MODE_TCP || sess->fe->mode == PR_MODE_HTTP))
px = sess->fe->defpx;
restart:
list_for_each_entry(rule, &px->tcp_req.l4_rules, list) {
ret = ACL_TEST_PASS;
if (rule->cond) {
ret = acl_exec_cond(rule->cond, sess->fe, sess, NULL, SMP_OPT_DIR_REQ|SMP_OPT_FINAL);
ret = acl_pass(ret);
if (rule->cond->pol == ACL_COND_UNLESS)
ret = !ret;
}
if (ret) {
/* Always call the action function if defined */
if (rule->action_ptr) {
switch (rule->action_ptr(rule, sess->fe, sess, NULL, ACT_OPT_FINAL | ACT_OPT_FIRST)) {
case ACT_RET_YIELD:
/* yield is not allowed at this point. If this return code is
* used it is a bug, so I prefer to abort the process.
*/
send_log(sess->fe, LOG_WARNING,
"Internal error: yield not allowed with tcp-request connection actions.");
/* fall through */
case ACT_RET_STOP:
case ACT_RET_DONE:
goto end;
case ACT_RET_CONT:
break;
case ACT_RET_DENY:
case ACT_RET_ABRT:
case ACT_RET_ERR:
case ACT_RET_INV:
result = 0;
goto end;
}
continue; /* eval the next rule */
}
/* If not action function defined, check for known actions */
if (rule->action == ACT_ACTION_ALLOW) {
goto end;
}
else if (rule->action == ACT_ACTION_DENY) {
_HA_ATOMIC_INC(&sess->fe->fe_counters.denied_conn);
if (sess->listener && sess->listener->counters)
_HA_ATOMIC_INC(&sess->listener->counters->denied_conn);
result = 0;
goto end;
}
else if (rule->action == ACT_TCP_EXPECT_PX) {
if (!(conn->flags & CO_FL_HANDSHAKE)) {
if (xprt_add_hs(conn) < 0) {
result = 0;
goto end;
}
}
conn->flags |= CO_FL_ACCEPT_PROXY;
}
else if (rule->action == ACT_TCP_EXPECT_CIP) {
if (!(conn->flags & CO_FL_HANDSHAKE)) {
if (xprt_add_hs(conn) < 0) {
result = 0;
goto end;
}
}
conn->flags |= CO_FL_ACCEPT_CIP;
}
}
}
if (px != sess->fe) {
px = sess->fe;
goto restart;
}
end:
return result;
}
/* This function performs the TCP layer5 analysis on the current request. It
* returns 0 if a reject rule matches, otherwise 1 if either an accept rule
* matches or if no more rule matches. It can only use rules which don't need
* any data. This only works on session-based client-facing stream connectors.
* An example of valid use case is to track a stick-counter on the source
* address extracted from the proxy protocol.
*/
int tcp_exec_l5_rules(struct session *sess)
{
struct proxy *px = sess->fe;
struct act_rule *rule;
int result = 1;
enum acl_test_res ret;
if (sess->fe->defpx && (sess->fe->mode == PR_MODE_TCP || sess->fe->mode == PR_MODE_HTTP))
px = sess->fe->defpx;
restart:
list_for_each_entry(rule, &px->tcp_req.l5_rules, list) {
ret = ACL_TEST_PASS;
if (rule->cond) {
ret = acl_exec_cond(rule->cond, sess->fe, sess, NULL, SMP_OPT_DIR_REQ|SMP_OPT_FINAL);
ret = acl_pass(ret);
if (rule->cond->pol == ACL_COND_UNLESS)
ret = !ret;
}
if (ret) {
/* Always call the action function if defined */
if (rule->action_ptr) {
switch (rule->action_ptr(rule, sess->fe, sess, NULL, ACT_OPT_FINAL | ACT_OPT_FIRST)) {
case ACT_RET_YIELD:
/* yield is not allowed at this point. If this return code is
* used it is a bug, so I prefer to abort the process.
*/
send_log(sess->fe, LOG_WARNING,
"Internal error: yield not allowed with tcp-request session actions.");
/* fall through */
case ACT_RET_STOP:
case ACT_RET_DONE:
goto end;
case ACT_RET_CONT:
break;
case ACT_RET_DENY:
case ACT_RET_ABRT:
case ACT_RET_ERR:
case ACT_RET_INV:
result = 0;
goto end;
}
continue; /* eval the next rule */
}
/* If not action function defined, check for known actions */
if (rule->action == ACT_ACTION_ALLOW) {
goto end;
}
else if (rule->action == ACT_ACTION_DENY) {
_HA_ATOMIC_INC(&sess->fe->fe_counters.denied_sess);
if (sess->listener && sess->listener->counters)
_HA_ATOMIC_INC(&sess->listener->counters->denied_sess);
result = 0;
goto end;
}
}
}
if (px != sess->fe) {
px = sess->fe;
goto restart;
}
end:
return result;
}
/* Parse a tcp-response rule. Return a negative value in case of failure */
static int tcp_parse_response_rule(char **args, int arg, int section_type,
struct proxy *curpx, const struct proxy *defpx,
struct act_rule *rule, char **err,
unsigned int where,
const char *file, int line)
{
if ((curpx == defpx && strlen(defpx->id) == 0) || !(curpx->cap & PR_CAP_BE)) {
memprintf(err, "%s %s is only allowed in 'backend' sections or 'defaults' section with a name",
args[0], args[1]);
return -1;
}
if (strcmp(args[arg], "accept") == 0) {
arg++;
rule->action = ACT_ACTION_ALLOW;
rule->flags |= ACT_FLAG_FINAL;
}
else if (strcmp(args[arg], "reject") == 0) {
arg++;
rule->action = ACT_ACTION_DENY;
rule->flags |= ACT_FLAG_FINAL;
}
else if (strcmp(args[arg], "close") == 0) {
arg++;
rule->action = ACT_TCP_CLOSE;
rule->flags |= ACT_FLAG_FINAL;
}
else {
struct action_kw *kw;
kw = tcp_res_cont_action(args[arg]);
if (kw) {
arg++;
rule->kw = kw;
if (kw->parse((const char **)args, &arg, curpx, rule, err) == ACT_RET_PRS_ERR)
return -1;
} else {
const char *extra[] = { "accept", "reject", "close", NULL };
const char *best = action_suggest(args[arg], &tcp_res_cont_keywords, extra);
action_build_list(&tcp_res_cont_keywords, &trash);
memprintf(err,
"'%s %s' expects 'accept', 'close', 'reject', %s in %s '%s' (got '%s').%s%s%s",
args[0], args[1], trash.area,
proxy_type_str(curpx), curpx->id, args[arg],
best ? " Did you mean '" : "",
best ? best : "",
best ? "' maybe ?" : "");
return -1;
}
}
if (strcmp(args[arg], "if") == 0 || strcmp(args[arg], "unless") == 0) {
if ((rule->cond = build_acl_cond(file, line, &curpx->acl, curpx, (const char **)args+arg, err)) == NULL) {
memprintf(err,
"'%s %s %s' : error detected in %s '%s' while parsing '%s' condition : %s",
args[0], args[1], args[2], proxy_type_str(curpx), curpx->id, args[arg], *err);
return -1;
}
}
else if (*args[arg]) {
memprintf(err,
"'%s %s %s' only accepts 'if' or 'unless', in %s '%s' (got '%s')",
args[0], args[1], args[2], proxy_type_str(curpx), curpx->id, args[arg]);
return -1;
}
return 0;
}
/* This function executes a track-sc* actions. On success, it returns
* ACT_RET_CONT. If it must yield, it return ACT_RET_YIELD. Otherwsize
* ACT_RET_ERR is returned.
*/
static enum act_return tcp_action_track_sc(struct act_rule *rule, struct proxy *px,
struct session *sess, struct stream *s, int flags)
{
struct stksess *ts;
struct stktable *t;
struct stktable_key *key;
struct sample smp;
int opt;
opt = SMP_OPT_DIR_REQ;
if (flags & ACT_FLAG_FINAL)
opt |= SMP_OPT_FINAL;
t = rule->arg.trk_ctr.table.t;
if (rule->from == ACT_F_TCP_REQ_CNT) { /* L7 rules: use the stream */
if (stkctr_entry(&s->stkctr[rule->action]))
goto end;
key = stktable_fetch_key(t, s->be, sess, s, opt, rule->arg.trk_ctr.expr, &smp);
if ((smp.flags & SMP_F_MAY_CHANGE) && !(flags & ACT_FLAG_FINAL))
return ACT_RET_YIELD; /* key might appear later */
if (key && (ts = stktable_get_entry(t, key))) {
stream_track_stkctr(&s->stkctr[rule->action], t, ts);
stkctr_set_flags(&s->stkctr[rule->action], STKCTR_TRACK_CONTENT);
if (sess->fe != s->be)
stkctr_set_flags(&s->stkctr[rule->action], STKCTR_TRACK_BACKEND);
}
}
else { /* L4/L5 rules: use the session */
if (stkctr_entry(&sess->stkctr[rule->action]))
goto end;
key = stktable_fetch_key(t, sess->fe, sess, NULL, opt, rule->arg.trk_ctr.expr, NULL);
if (key && (ts = stktable_get_entry(t, key)))
stream_track_stkctr(&sess->stkctr[rule->action], t, ts);
}
end:
return ACT_RET_CONT;
}
/* This function executes a capture actions. It executes a fetch expression,
* turns the result into a string and puts it in a capture slot. On success, it
* returns ACT_RET_CONT. If it must yield, it return ACT_RET_YIELD. Otherwsize
* ACT_RET_ERR is returned.
*/
static enum act_return tcp_action_capture(struct act_rule *rule, struct proxy *px,
struct session *sess, struct stream *s, int flags)
{
struct sample *key;
struct cap_hdr *h = rule->arg.cap.hdr;
char **cap = s->req_cap;
int len, opt;
opt = ((rule->from == ACT_F_TCP_REQ_CNT) ? SMP_OPT_DIR_REQ : SMP_OPT_DIR_RES);
if (flags & ACT_FLAG_FINAL)
opt |= SMP_OPT_FINAL;
key = sample_fetch_as_type(s->be, sess, s, opt, rule->arg.cap.expr, SMP_T_STR);
if (!key)
goto end;
if ((key->flags & SMP_F_MAY_CHANGE) && !(flags & ACT_FLAG_FINAL))
return ACT_RET_YIELD; /* key might appear later */
if (cap[h->index] == NULL) {
cap[h->index] = pool_alloc(h->pool);
if (cap[h->index] == NULL) /* no more capture memory, ignore error */
goto end;
}
len = key->data.u.str.data;
if (len > h->len)
len = h->len;
memcpy(cap[h->index], key->data.u.str.area, len);
cap[h->index][len] = 0;
end:
return ACT_RET_CONT;
}
static void release_tcp_capture(struct act_rule * rule)
{
release_sample_expr(rule->arg.cap.expr);
}
static void release_tcp_track_sc(struct act_rule * rule)
{
release_sample_expr(rule->arg.trk_ctr.expr);
}
/* Parse a tcp-request rule. Return a negative value in case of failure */
static int tcp_parse_request_rule(char **args, int arg, int section_type,
struct proxy *curpx, const struct proxy *defpx,
struct act_rule *rule, char **err,
unsigned int where, const char *file, int line)
{
if (curpx == defpx && strlen(defpx->id) == 0) {
memprintf(err, "%s %s is not allowed in anonymous 'defaults' sections",
args[0], args[1]);
return -1;
}
if (strcmp(args[arg], "accept") == 0) {
arg++;
rule->action = ACT_ACTION_ALLOW;
rule->flags |= ACT_FLAG_FINAL;
}
else if (strcmp(args[arg], "reject") == 0) {
arg++;
rule->action = ACT_ACTION_DENY;
rule->flags |= ACT_FLAG_FINAL;
}
else if (strcmp(args[arg], "capture") == 0) {
struct sample_expr *expr;
struct cap_hdr *hdr;
int kw = arg;
int len = 0;
if (!(curpx->cap & PR_CAP_FE)) {
memprintf(err,
"'%s %s %s' : proxy '%s' has no frontend capability",
args[0], args[1], args[kw], curpx->id);
return -1;
}
if (!(where & SMP_VAL_FE_REQ_CNT)) {
memprintf(err,
"'%s %s' is not allowed in '%s %s' rules in %s '%s'",
args[arg], args[arg+1], args[0], args[1], proxy_type_str(curpx), curpx->id);
return -1;
}
arg++;
curpx->conf.args.ctx = ARGC_CAP;
expr = sample_parse_expr(args, &arg, file, line, err, &curpx->conf.args, NULL);
if (!expr) {
memprintf(err,
"'%s %s %s' : %s",
args[0], args[1], args[kw], *err);
return -1;
}
if (!(expr->fetch->val & where)) {
memprintf(err,
"'%s %s %s' : fetch method '%s' extracts information from '%s', none of which is available here",
args[0], args[1], args[kw], args[arg-1], sample_src_names(expr->fetch->use));
release_sample_expr(expr);
return -1;
}
if (strcmp(args[arg], "len") == 0) {
arg++;
if (!args[arg]) {
memprintf(err,
"'%s %s %s' : missing length value",
args[0], args[1], args[kw]);
release_sample_expr(expr);
return -1;
}
/* we copy the table name for now, it will be resolved later */
len = atoi(args[arg]);
if (len <= 0) {
memprintf(err,
"'%s %s %s' : length must be > 0",
args[0], args[1], args[kw]);
release_sample_expr(expr);
return -1;
}
arg++;
}
if (!len) {
memprintf(err,
"'%s %s %s' : a positive 'len' argument is mandatory",
args[0], args[1], args[kw]);
free(expr);
return -1;
}
hdr = calloc(1, sizeof(*hdr));
if (!hdr) {
memprintf(err, "parsing [%s:%d] : out of memory", file, line);
release_sample_expr(expr);
return -1;
}
hdr->next = curpx->req_cap;
hdr->name = NULL; /* not a header capture */
hdr->namelen = 0;
hdr->len = len;
hdr->pool = create_pool("caphdr", hdr->len + 1, MEM_F_SHARED);
hdr->index = curpx->nb_req_cap++;
curpx->req_cap = hdr;
curpx->to_log |= LW_REQHDR;
/* check if we need to allocate an http_txn struct for HTTP parsing */
curpx->http_needed |= !!(expr->fetch->use & SMP_USE_HTTP_ANY);
rule->arg.cap.expr = expr;
rule->arg.cap.hdr = hdr;
rule->action = ACT_CUSTOM;
rule->action_ptr = tcp_action_capture;
rule->check_ptr = check_capture;
rule->release_ptr = release_tcp_capture;
}
else if (strncmp(args[arg], "track-sc", 8) == 0) {
struct sample_expr *expr;
int kw = arg;
unsigned int tsc_num;
const char *tsc_num_str;
arg++;
tsc_num_str = &args[kw][8];
if (cfg_parse_track_sc_num(&tsc_num, tsc_num_str, tsc_num_str + strlen(tsc_num_str), err) == -1) {
memprintf(err, "'%s %s %s' : %s", args[0], args[1], args[kw], *err);
return -1;
}
curpx->conf.args.ctx = ARGC_TRK;
expr = sample_parse_expr(args, &arg, file, line, err, &curpx->conf.args, NULL);
if (!expr) {
memprintf(err,
"'%s %s %s' : %s",
args[0], args[1], args[kw], *err);
return -1;
}
if (!(expr->fetch->val & where)) {
memprintf(err,
"'%s %s %s' : fetch method '%s' extracts information from '%s', none of which is available here",
args[0], args[1], args[kw], args[arg-1], sample_src_names(expr->fetch->use));
release_sample_expr(expr);
return -1;
}
/* check if we need to allocate an http_txn struct for HTTP parsing */
curpx->http_needed |= !!(expr->fetch->use & SMP_USE_HTTP_ANY);
if (strcmp(args[arg], "table") == 0) {
arg++;
if (!args[arg]) {
memprintf(err,
"'%s %s %s' : missing table name",
args[0], args[1], args[kw]);
release_sample_expr(expr);
return -1;
}
/* we copy the table name for now, it will be resolved later */
rule->arg.trk_ctr.table.n = strdup(args[arg]);
arg++;
}
rule->action = tsc_num;
rule->arg.trk_ctr.expr = expr;
rule->action_ptr = tcp_action_track_sc;
rule->check_ptr = check_trk_action;
rule->release_ptr = release_tcp_track_sc;
}
else if (strcmp(args[arg], "expect-proxy") == 0) {
if (strcmp(args[arg+1], "layer4") != 0) {
memprintf(err,
"'%s %s %s' only supports 'layer4' in %s '%s' (got '%s')",
args[0], args[1], args[arg], proxy_type_str(curpx), curpx->id, args[arg+1]);
return -1;
}
if (!(where & SMP_VAL_FE_CON_ACC)) {
memprintf(err,
"'%s %s' is not allowed in '%s %s' rules in %s '%s'",
args[arg], args[arg+1], args[0], args[1], proxy_type_str(curpx), curpx->id);
return -1;
}
arg += 2;