From c2bc14ff30c349b52b5f84cef6b73061a0394143 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= Date: Thu, 11 Apr 2019 18:17:16 +0200 Subject: [PATCH] inet_aton: Use getaddrinfo() if possible MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Socket::inet_aton() used gethostbyname() to process arguments that are not an IP addres. However, gethostbyname() is not thread-safe and when called from multiple threads a bogus value can be returned. This patch does add any new test because a basic inet_aton() usage is already covered and because reproducing the thread failure would require flodding DNS servers with thousounds of request. Signed-off-by: Petr Písař --- Socket.xs | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/Socket.xs b/Socket.xs index 753cd09..6f6ced8 100644 --- a/Socket.xs +++ b/Socket.xs @@ -584,6 +584,19 @@ inet_aton(host) char * host CODE: { +#ifdef HAS_GETADDRINFO + struct addrinfo *res; + struct addrinfo hints = {0,}; + hints.ai_family = AF_INET; + if (!getaddrinfo(host, NULL, &hints, &res)) { + ST(0) = sv_2mortal(newSVpvn( + (char *)&(((struct sockaddr_in *)res->ai_addr)->sin_addr.s_addr), + 4 + )); + freeaddrinfo(res); + XSRETURN(1); + } +#else struct in_addr ip_address; struct hostent * phe; @@ -592,11 +605,13 @@ inet_aton(host) XSRETURN(1); } + /* gethostbyname is not thread-safe */ phe = gethostbyname(host); if (phe && phe->h_addrtype == AF_INET && phe->h_length == 4) { ST(0) = sv_2mortal(newSVpvn((char *)phe->h_addr, phe->h_length)); XSRETURN(1); } +#endif XSRETURN_UNDEF; } -- 2.20.1