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MEDIUM: dns: extract options

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DNS selection preferences are actually declared inline in the
struct server. There are copied from the server struct to the
dns_resolution struct for each resolution.

Next patchs adds new preferences options, and it is not a good
way to copy all the configuration information before each dns
resolution.

This patch extract the configuration preference from the struct
server and declares a new dedicated struct. Only a pointer to this
new striuict will be copied before each dns resolution.
This commit is contained in:
Thierry Fournier 2016-02-17 21:25:09 +01:00 committed by Willy Tarreau
parent 70473a5f8c
commit ada348459f
6 changed files with 35 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/proto/dns.h
View File

@ -34,8 +34,8 @@ int dns_init_resolvers(void);
uint16_t dns_rnd16(void); uint16_t dns_rnd16(void);
int dns_validate_dns_response(unsigned char *resp, unsigned char *bufend, char *dn_name, int dn_name_len); int dns_validate_dns_response(unsigned char *resp, unsigned char *bufend, char *dn_name, int dn_name_len);
int dns_get_ip_from_response(unsigned char *resp, unsigned char *resp_end, int dns_get_ip_from_response(unsigned char *resp, unsigned char *resp_end,
char *dn_name, int dn_name_len, void *currentip, struct dns_resolution *resol, void *currentip,
short currentip_sin_family, int family_priority, short currentip_sin_family,
void **newip, short *newip_sin_family); void **newip, short *newip_sin_family);
void dns_resolve_send(struct dgram_conn *dgram); void dns_resolve_send(struct dgram_conn *dgram);
void dns_resolve_recv(struct dgram_conn *dgram); void dns_resolve_recv(struct dgram_conn *dgram);

6
include/types/dns.h
View File

@ -140,6 +140,10 @@ struct dns_nameserver {
} counters; } counters;
}; };
struct dns_options {
int family_prio; /* which IP family should the resolver use when both are returned */
};
/* /*
* resolution structure associated to single server and used to manage name resolution for * resolution structure associated to single server and used to manage name resolution for
* this server. * this server.
@ -155,7 +159,7 @@ struct dns_resolution {
/* requester callback, for error management */ /* requester callback, for error management */
char *hostname_dn; /* server hostname in domain name label format */ char *hostname_dn; /* server hostname in domain name label format */
int hostname_dn_len; /* server domain name label len */ int hostname_dn_len; /* server domain name label len */
int resolver_family_priority; /* which IP family should the resolver use when both are returned */ struct dns_options *opts; /* IP selection options inherited from the configuration file. */
unsigned int last_resolution; /* time of the lastest valid resolution */ unsigned int last_resolution; /* time of the lastest valid resolution */
unsigned int last_sent_packet; /* time of the latest DNS packet sent */ unsigned int last_sent_packet; /* time of the latest DNS packet sent */
unsigned int last_status_change; /* time of the latest DNS resolution status change */ unsigned int last_status_change; /* time of the latest DNS resolution status change */

3
include/types/server.h
View File

@ -35,6 +35,7 @@
#include <types/connection.h> #include <types/connection.h>
#include <types/counters.h> #include <types/counters.h>
#include <types/dns.h>
#include <types/freq_ctr.h> #include <types/freq_ctr.h>
#include <types/obj_type.h> #include <types/obj_type.h>
#include <types/proxy.h> #include <types/proxy.h>
@ -224,7 +225,7 @@ struct server {
char *resolvers_id; /* resolvers section used by this server */ char *resolvers_id; /* resolvers section used by this server */
char *hostname; /* server hostname */ char *hostname; /* server hostname */
struct dns_resolution *resolution; /* server name resolution */ struct dns_resolution *resolution; /* server name resolution */
int resolver_family_priority; /* which IP family should the resolver use when both are returned */ struct dns_options dns_opts;
#ifdef USE_OPENSSL #ifdef USE_OPENSSL
int use_ssl; /* ssl enabled */ int use_ssl; /* ssl enabled */

4
src/checks.c
View File

@ -2218,8 +2218,8 @@ int trigger_resolution(struct server *s)
resolution->query_id = query_id; resolution->query_id = query_id;
resolution->qid.key = query_id; resolution->qid.key = query_id;
resolution->step = RSLV_STEP_RUNNING; resolution->step = RSLV_STEP_RUNNING;
resolution->resolver_family_priority = s->resolver_family_priority; resolution->opts = &s->dns_opts;
if (resolution->resolver_family_priority == AF_INET) { if (resolution->opts->family_prio == AF_INET) {
resolution->query_type = DNS_RTYPE_A; resolution->query_type = DNS_RTYPE_A;
} else { } else {
resolution->query_type = DNS_RTYPE_AAAA; resolution->query_type = DNS_RTYPE_AAAA;

14
src/dns.c
View File

@ -102,7 +102,7 @@ void dns_reset_resolution(struct dns_resolution *resolution)
resolution->qid.key = 0; resolution->qid.key = 0;
/* default values */ /* default values */
if (resolution->resolver_family_priority == AF_INET) { if (resolution->opts->family_prio == AF_INET) {
resolution->query_type = DNS_RTYPE_A; resolution->query_type = DNS_RTYPE_A;
} else { } else {
resolution->query_type = DNS_RTYPE_AAAA; resolution->query_type = DNS_RTYPE_AAAA;
@ -593,12 +593,20 @@ int dns_validate_dns_response(unsigned char *resp, unsigned char *bufend, char *
* returns one of the DNS_UPD_* code * returns one of the DNS_UPD_* code
*/ */
int dns_get_ip_from_response(unsigned char *resp, unsigned char *resp_end, int dns_get_ip_from_response(unsigned char *resp, unsigned char *resp_end,
char *dn_name, int dn_name_len, void *currentip, short currentip_sin_family, struct dns_resolution *resol, void *currentip,
int family_priority, void **newip, short *newip_sin_family) short currentip_sin_family,
void **newip, short *newip_sin_family)
{ {
int family_priority;
char *dn_name;
int dn_name_len;
int i, ancount, cnamelen, type, data_len, currentip_found; int i, ancount, cnamelen, type, data_len, currentip_found;
unsigned char *reader, *cname, *ptr, *newip4, *newip6; unsigned char *reader, *cname, *ptr, *newip4, *newip6;
family_priority = resol->opts->family_prio;
dn_name = resol->hostname_dn;
dn_name_len = resol->hostname_dn_len;
cname = *newip = newip4 = newip6 = NULL; cname = *newip = newip4 = newip6 = NULL;
cnamelen = currentip_found = 0; cnamelen = currentip_found = 0;
*newip_sin_family = AF_UNSPEC; *newip_sin_family = AF_UNSPEC;

26
src/server.c
View File

@ -1017,15 +1017,15 @@ int parse_server(const char *file, int linenum, char **args, struct proxy *curpr
newsrv->agent.fall = curproxy->defsrv.agent.fall; newsrv->agent.fall = curproxy->defsrv.agent.fall;
newsrv->agent.health = newsrv->agent.rise; /* up, but will fall down at first failure */ newsrv->agent.health = newsrv->agent.rise; /* up, but will fall down at first failure */
newsrv->agent.server = newsrv; newsrv->agent.server = newsrv;
newsrv->resolver_family_priority = curproxy->defsrv.resolver_family_priority; newsrv->dns_opts.family_prio = curproxy->defsrv.dns_opts.family_prio;
if (newsrv->resolver_family_priority == AF_UNSPEC) if (newsrv->dns_opts.family_prio == AF_UNSPEC)
newsrv->resolver_family_priority = AF_INET6; newsrv->dns_opts.family_prio = AF_INET6;
cur_arg = 3; cur_arg = 3;
} else { } else {
newsrv = &curproxy->defsrv; newsrv = &curproxy->defsrv;
cur_arg = 1; cur_arg = 1;
newsrv->resolver_family_priority = AF_INET6; newsrv->dns_opts.family_prio = AF_INET6;
} }
while (*args[cur_arg]) { while (*args[cur_arg]) {
@ -1079,9 +1079,9 @@ int parse_server(const char *file, int linenum, char **args, struct proxy *curpr
} }
else if (!strcmp(args[cur_arg], "resolve-prefer")) { else if (!strcmp(args[cur_arg], "resolve-prefer")) {
if (!strcmp(args[cur_arg + 1], "ipv4")) if (!strcmp(args[cur_arg + 1], "ipv4"))
newsrv->resolver_family_priority = AF_INET; newsrv->dns_opts.family_prio = AF_INET;
else if (!strcmp(args[cur_arg + 1], "ipv6")) else if (!strcmp(args[cur_arg + 1], "ipv6"))
newsrv->resolver_family_priority = AF_INET6; newsrv->dns_opts.family_prio = AF_INET6;
else { else {
Alert("parsing [%s:%d]: '%s' expects either ipv4 or ipv6 as argument.\n", Alert("parsing [%s:%d]: '%s' expects either ipv4 or ipv6 as argument.\n",
file, linenum, args[cur_arg]); file, linenum, args[cur_arg]);
@ -1746,7 +1746,7 @@ int parse_server(const char *file, int linenum, char **args, struct proxy *curpr
} }
if (newsrv->resolution) if (newsrv->resolution)
newsrv->resolution->resolver_family_priority = newsrv->resolver_family_priority; newsrv->resolution->opts = &newsrv->dns_opts;
newsrv->check.state |= CHK_ST_CONFIGURED | CHK_ST_ENABLED; newsrv->check.state |= CHK_ST_CONFIGURED | CHK_ST_ENABLED;
} }
@ -2625,9 +2625,9 @@ int snr_resolution_cb(struct dns_resolution *resolution, struct dns_nameserver *
goto invalid; goto invalid;
} }
ret = dns_get_ip_from_response(response, response_end, resolution->hostname_dn, resolution->hostname_dn_len, ret = dns_get_ip_from_response(response, response_end, resolution,
serverip, server_sin_family, resolution->resolver_family_priority, &firstip, serverip, server_sin_family, &firstip,
&firstip_sin_family); &firstip_sin_family);
switch (ret) { switch (ret) {
case DNS_UPD_NO: case DNS_UPD_NO:
@ -2737,8 +2737,8 @@ int snr_resolution_error_cb(struct dns_resolution *resolution, int error_code)
case DNS_RESP_TRUNCATED: case DNS_RESP_TRUNCATED:
case DNS_RESP_ERROR: case DNS_RESP_ERROR:
case DNS_RESP_NO_EXPECTED_RECORD: case DNS_RESP_NO_EXPECTED_RECORD:
res_preferred_afinet = resolution->resolver_family_priority == AF_INET && resolution->query_type == DNS_RTYPE_A; res_preferred_afinet = resolution->opts->family_prio == AF_INET && resolution->query_type == DNS_RTYPE_A;
res_preferred_afinet6 = resolution->resolver_family_priority == AF_INET6 && resolution->query_type == DNS_RTYPE_AAAA; res_preferred_afinet6 = resolution->opts->family_prio == AF_INET6 && resolution->query_type == DNS_RTYPE_AAAA;
if ((res_preferred_afinet || res_preferred_afinet6) if ((res_preferred_afinet || res_preferred_afinet6)
|| (resolution->try > 0)) { || (resolution->try > 0)) {
@ -2753,7 +2753,7 @@ int snr_resolution_error_cb(struct dns_resolution *resolution, int error_code)
} }
else { else {
resolution->try -= 1; resolution->try -= 1;
if (resolution->resolver_family_priority == AF_INET) { if (resolution->opts->family_prio == AF_INET) {
resolution->query_type = DNS_RTYPE_A; resolution->query_type = DNS_RTYPE_A;
} else { } else {
resolution->query_type = DNS_RTYPE_AAAA; resolution->query_type = DNS_RTYPE_AAAA;