From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shivani Bhardwaj Subject: [PATCH] extensions: libxt_mangle: Use getaddrinfo() Date: Mon, 7 Nov 2016 18:15:17 +0530 Message-ID: <20161107124517.GA15462@Novo> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: netfilter-devel@vger.kernel.org Return-path: Received: from mail-pf0-f194.google.com ([209.85.192.194]:36210 "EHLO mail-pf0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751325AbcKGMp3 (ORCPT ); Mon, 7 Nov 2016 07:45:29 -0500 Received: by mail-pf0-f194.google.com with SMTP id n85so16084807pfi.3 for ; Mon, 07 Nov 2016 04:45:29 -0800 (PST) Received: from Novo ([47.30.198.10]) by smtp.gmail.com with ESMTPSA id p20sm40301750pfi.78.2016.11.07.04.45.26 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 07 Nov 2016 04:45:28 -0800 (PST) Content-Disposition: inline Sender: netfilter-devel-owner@vger.kernel.org List-ID: Replace gethostbyname() with getaddrinfo() as getaddrinfo() deprecates the former and allows programs to eliminate IPv4-versus-IPv6 dependencies. Signed-off-by: Shivani Bhardwaj --- extensions/libxt_mangle.c | 28 ++++++++++++++++++---------- 1 file changed, 18 insertions(+), 10 deletions(-) diff --git a/extensions/libxt_mangle.c b/extensions/libxt_mangle.c index 4b20feb..360742b 100644 --- a/extensions/libxt_mangle.c +++ b/extensions/libxt_mangle.c @@ -74,22 +74,30 @@ static void inaddrcpy(struct in_addr *dst, struct in_addr *src) static struct in_addr *host_to_addr(const char *name, unsigned int *naddr) { - struct hostent *host; struct in_addr *addr; + struct addrinfo hints; + struct addrinfo *res, *p; + int err; unsigned int i; - *naddr = 0; - if ((host = gethostbyname(name)) != NULL) { - if (host->h_addrtype != AF_INET || - host->h_length != sizeof(struct in_addr)) - return (struct in_addr *) NULL; + memset(&hints, 0, sizeof(hints)); + hints.ai_flags = AI_CANONNAME; + hints.ai_family = AF_INET; + hints.ai_socktype = SOCK_RAW; - while (host->h_addr_list[*naddr] != (char *) NULL) + *naddr = 0; + err = getaddrinfo(name, NULL, &hints, &res); + if (err != 0) + return NULL; + else { + for (p = res; p != NULL; p = p->ai_next) (*naddr)++; addr = xtables_calloc(*naddr, sizeof(struct in_addr)); - for (i = 0; i < *naddr; i++) - inaddrcpy(&(addr[i]), - (struct in_addr *) host->h_addr_list[i]); + for (i = 0, p = res; p != NULL; p = p->ai_next) + memcpy(&addr[i++], + &((const struct sockaddr_in *)p->ai_addr)->sin_addr, + sizeof(struct in_addr)); + freeaddrinfo(res); return addr; } -- 2.7.4