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curl
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added the sharing of DNS cache

This commit is contained in:
Jean-Philippe Barette-LaPierre 2003-02-04 23:48:46 +00:00
parent fa47138327
commit beb13a1d3e
9 changed files with 121 additions and 22 deletions
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13
include/curl/curl.h
View File

@ -902,10 +902,15 @@ typedef enum {
/* Different data locks for a single share */
typedef enum {
CURL_LOCK_DATA_NONE = 0,
CURL_LOCK_DATA_COOKIE = 1,
CURL_LOCK_DATA_DNS = 2,
CURL_LOCK_DATA_SSL_SESSION = 3,
CURL_LOCK_DATA_CONNECT = 4,
/* CURL_LOCK_DATA_SHARE is used internaly to say that
* the locking is just made to change the internal state of the share
* itself.
*/
CURL_LOCK_DATA_SHARE,
CURL_LOCK_DATA_COOKIE,
CURL_LOCK_DATA_DNS,
CURL_LOCK_DATA_SSL_SESSION,
CURL_LOCK_DATA_CONNECT,
CURL_LOCK_DATA_LAST
} curl_lock_data;

2
lib/Makefile.am
View File

@ -66,7 +66,7 @@ getpass.c netrc.c telnet.h getinfo.c getinfo.h transfer.c strequal.c \
strequal.h easy.c security.h security.c krb4.c krb4.h memdebug.c \
memdebug.h inet_ntoa_r.h http_chunks.c http_chunks.h strtok.c strtok.h \
connect.c connect.h llist.c llist.h hash.c hash.h multi.c \
content_encoding.c content_encoding.h share.h
content_encoding.c content_encoding.h share.c share.h
noinst_HEADERS = setup.h transfer.h

2
lib/connect.c
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@ -248,7 +248,7 @@ static CURLcode bindlocal(struct connectdata *conn,
if ( h ) {
Curl_addrinfo *addr = h->addr;
Curl_resolv_unlock(h);
Curl_resolv_unlock(data, h);
/* we don't need it anymore after this function has returned */
#ifdef ENABLE_IPV6

4
lib/ftp.c
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@ -1233,7 +1233,7 @@ CURLcode ftp_use_port(struct connectdata *conn)
if(h)
/* when we return from here, we can forget about this */
Curl_resolv_unlock(h);
Curl_resolv_unlock(data, h);
if ( h || sa_filled_in) {
if( (portsock = socket(AF_INET, SOCK_STREAM, 0)) >= 0 ) {
@ -1497,7 +1497,7 @@ CURLcode ftp_use_pasv(struct connectdata *conn,
&conninfo,
connected);
Curl_resolv_unlock(addr); /* we're done using this address */
Curl_resolv_unlock(data, addr); /* we're done using this address */
/*
* When this is used from the multi interface, this might've returned with

25
lib/hostip.c
View File

@ -64,6 +64,7 @@
#include "sendf.h"
#include "hostip.h"
#include "hash.h"
#include "share.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
@ -211,6 +212,10 @@ void Curl_scan_cache_used(void *user, void *ptr)
#define HOSTCACHE_RETURN(dns) \
{ \
free(entry_id); \
if(data->share) \
{ \
Curl_share_unlock(data, CURL_LOCK_DATA_DNS); \
} \
return dns; \
}
@ -245,7 +250,12 @@ struct Curl_dns_entry *Curl_resolv(struct SessionHandle *data,
/* If we can't create the entry id, fail */
if (!entry_id)
return NULL;
if(data->share)
{
Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
}
/* See if its already in our dns cache */
dns = Curl_hash_pick(data->hostcache, entry_id, entry_len+1);
@ -284,6 +294,19 @@ struct Curl_dns_entry *Curl_resolv(struct SessionHandle *data,
HOSTCACHE_RETURN(dns);
}
void Curl_resolv_unlock(struct SessionHandle *data, struct Curl_dns_entry *dns)
{
if(data->share)
{
Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);
}
dns->inuse--;
if(data->share)
{
Curl_share_unlock(data, CURL_LOCK_DATA_DNS);
}
}
/*
* This is a wrapper function for freeing name information in a protocol
* independent way. This takes care of using the appropriate underlaying

2
lib/hostip.h
View File

@ -59,7 +59,7 @@ struct Curl_dns_entry *Curl_resolv(struct SessionHandle *data,
int port);
/* unlock a previously resolved dns entry */
#define Curl_resolv_unlock(dns) dns->inuse--
void Curl_resolv_unlock(struct SessionHandle *data, struct Curl_dns_entry *dns);
/* for debugging purposes only: */
void Curl_scan_cache_used(void *user, void *ptr);

49
lib/share.c
View File

@ -65,12 +65,53 @@ curl_share_setopt(CURLSH *sh, CURLSHoption option, ...)
/* this is a type this share will share */
type = va_arg(param, int);
share->specifier |= (1<<type);
switch( type )
{
case CURL_LOCK_DATA_DNS:
if (!share->hostcache) {
share->hostcache = Curl_hash_alloc(7, Curl_freednsinfo);
}
break;
case CURL_LOCK_DATA_COOKIE:
break;
case CURL_LOCK_DATA_SSL_SESSION:
break;
case CURL_LOCK_DATA_CONNECT:
break;
default:
return CURLSHE_BAD_OPTION;
}
break;
case CURLSHOPT_UNSHARE:
/* this is a type this share will no longer share */
type = va_arg(param, int);
share->specifier &= ~(1<<type);
switch( type )
{
case CURL_LOCK_DATA_DNS:
if (share->hostcache) {
Curl_hash_destroy(share->hostcache);
share->hostcache = NULL;
}
break;
case CURL_LOCK_DATA_COOKIE:
break;
case CURL_LOCK_DATA_SSL_SESSION:
break;
case CURL_LOCK_DATA_CONNECT:
break;
default:
return CURLSHE_BAD_OPTION;
}
break;
case CURLSHOPT_LOCKFUNC:
@ -108,7 +149,7 @@ CURLSHcode curl_share_cleanup(CURLSH *sh)
CURLSHcode
Curl_share_acquire_lock(struct SessionHandle *data, curl_lock_data type)
Curl_share_lock(struct SessionHandle *data, curl_lock_data type, curl_lock_access access)
{
struct Curl_share *share = data->share;
@ -116,8 +157,7 @@ Curl_share_acquire_lock(struct SessionHandle *data, curl_lock_data type)
return CURLSHE_INVALID;
if(share->specifier & (1<<type)) {
share->lockfunc (data, type, CURL_LOCK_ACCESS_SINGLE, share->clientdata);
share->locked |= (1<<type);
share->lockfunc (data, type, access, share->clientdata);
}
/* else if we don't share this, pretend successful lock */
@ -125,7 +165,7 @@ Curl_share_acquire_lock(struct SessionHandle *data, curl_lock_data type)
}
CURLSHcode
Curl_share_release_lock(struct SessionHandle *data, curl_lock_data type)
Curl_share_unlock(struct SessionHandle *data, curl_lock_data type)
{
struct Curl_share *share = data->share;
@ -134,7 +174,6 @@ Curl_share_release_lock(struct SessionHandle *data, curl_lock_data type)
if(share->specifier & (1<<type)) {
share->unlockfunc (data, type, share->clientdata);
share->locked &= ~(1<<type);
}
return CURLSHE_OK;

17
lib/share.h
View File

@ -30,15 +30,24 @@
/* this struct is libcurl-private, don't export details */
struct Curl_share {
unsigned int specifier;
unsigned int locked;
unsigned int dirty;
volatile unsigned int dirty;
curl_lock_function lockfunc;
curl_unlock_function unlockfunc;
void *clientdata;
curl_hash *hostcache;
};
CURLSHcode Curl_share_aquire_lock (struct SessionHandle *, curl_lock_data);
CURLSHcode Curl_share_release_lock (struct SessionHandle *, curl_lock_data);
CURLSHcode Curl_share_lock (
struct SessionHandle *,
curl_lock_data,
curl_lock_access
);
CURLSHcode Curl_share_unlock (
struct SessionHandle *,
curl_lock_data
);
#endif /* __CURL_SHARE_H */

29
lib/url.c
View File

@ -1078,10 +1078,33 @@ CURLcode Curl_setopt(struct SessionHandle *data, CURLoption option, ...)
struct Curl_share *set;
set = va_arg(param, struct Curl_share *);
if(data->share)
{
Curl_share_lock(data, CURL_LOCK_DATA_SHARE, CURL_LOCK_ACCESS_SINGLE);
/* checking the dns cache stuff */
if(data->share->hostcache == data->hostcache)
{
data->hostcache = NULL;
}
data->share->dirty--;
Curl_share_unlock(data, CURL_LOCK_DATA_SHARE);
}
data->share = set;
Curl_share_lock(data, CURL_LOCK_DATA_SHARE, CURL_LOCK_ACCESS_SINGLE);
data->share->dirty++;
if( data->hostcache )
{
Curl_hash_destroy(data->hostcache);
data->hostcache = data->share->hostcache;
}
Curl_share_unlock(data, CURL_LOCK_DATA_SHARE);
}
break;
@ -1518,7 +1541,7 @@ static int handleSock5Proxy(
socksreq[6] = ((char*)hp->h_addr_list[0])[2];
socksreq[7] = ((char*)hp->h_addr_list[0])[3];
Curl_resolv_unlock(dns); /* not used anymore from now on */
Curl_resolv_unlock(conn->data, dns); /* not used anymore from now on */
}
else {
failf(conn->data, "Failed to resolve \"%s\" for SOCKS5 connect.",
@ -2901,7 +2924,7 @@ CURLcode Curl_done(struct connectdata *conn)
}
if(conn->connect_addr)
Curl_resolv_unlock(conn->connect_addr); /* done with this */
Curl_resolv_unlock(conn->data, conn->connect_addr); /* done with this */
#if defined(MALLOCDEBUG) && defined(AGGRESIVE_TEST)
/* scan for DNS cache entries still marked as in use */