diff options
Diffstat (limited to 'libc/netbsd/resolv/res_send.c')
| -rw-r--r-- | libc/netbsd/resolv/res_send.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/libc/netbsd/resolv/res_send.c b/libc/netbsd/resolv/res_send.c index 24b740a..3aca760 100644 --- a/libc/netbsd/resolv/res_send.c +++ b/libc/netbsd/resolv/res_send.c @@ -81,6 +81,9 @@ __RCSID("$NetBSD: res_send.c,v 1.9 2006/01/24 17:41:25 christos Exp $"); #endif #endif /* LIBC_SCCS and not lint */ +/* set to 1 to use our small/simple/limited DNS cache */ +#define USE_RESOLV_CACHE 1 + /* * Send query to name server and wait for reply. */ @@ -111,6 +114,10 @@ __RCSID("$NetBSD: res_send.c,v 1.9 2006/01/24 17:41:25 christos Exp $"); #include <isc/eventlib.h> +#if USE_RESOLV_CACHE +# include <resolv_cache.h> +#endif + #ifndef DE_CONST #define DE_CONST(c,v) v = ((c) ? \ strchr((const void *)(c), *(const char *)(const void *)(c)) : NULL) @@ -344,12 +351,17 @@ res_queriesmatch(const u_char *buf1, const u_char *eom1, return (1); } + int res_nsend(res_state statp, const u_char *buf, int buflen, u_char *ans, int anssiz) { int gotsomewhere, terrno, try, v_circuit, resplen, ns, n; char abuf[NI_MAXHOST]; +#if USE_RESOLV_CACHE + struct resolv_cache* cache; + ResolvCacheStatus cache_status = RESOLV_CACHE_UNSUPPORTED; +#endif if (statp->nscount == 0) { errno = ESRCH; @@ -365,6 +377,20 @@ res_nsend(res_state statp, gotsomewhere = 0; terrno = ETIMEDOUT; +#if USE_RESOLV_CACHE + cache = __get_res_cache(); + if (cache != NULL) { + int anslen = 0; + cache_status = _resolv_cache_lookup( + cache, buf, buflen, + ans, anssiz, &anslen); + + if (cache_status == RESOLV_CACHE_FOUND) { + return anslen; + } + } +#endif + /* * If the ns_addr_list in the resolver context has changed, then * invalidate our cached copy and the associated timing data. @@ -534,6 +560,12 @@ res_nsend(res_state statp, (stdout, "%s", ""), ans, (resplen > anssiz) ? anssiz : resplen); +#if USE_RESOLV_CACHE + if (cache_status == RESOLV_CACHE_NOTFOUND) { + _resolv_cache_add(cache, buf, buflen, + ans, resplen); + } +#endif /* * If we have temporarily opened a virtual circuit, * or if we haven't been asked to keep a socket open, |