Hi, Right now wget code looks like this:
#ifdef ENABLE_IPV6 int ip_default_family = AF_INET6; #else int ip_default_family = AF_INET; #endif and then ./connect.c: sock = socket (ip_default_family, SOCK_STREAM, 0); This assumes that binary compiled with ipv6 support is always used on IPv6 capable host which is not true in many, many cases. Such binary on ipv4 only host will cause: [EMAIL PROTECTED] src]$ LC_ALL=C ./wget wp.pl --21:48:37-- http://wp.pl/ => `index.html' Resolving wp.pl... 212.77.100.101 Connecting to wp.pl[212.77.100.101]:80... failed: Address family not supported by protocol. Retrying. --21:48:38-- http://wp.pl/ (try: 2) => `index.html' Connecting to wp.pl[212.77.100.101]:80... failed: Address family not supported by protocol. Retrying. --21:48:40-- http://wp.pl/ (try: 3) => `index.html' Connecting to wp.pl[212.77.100.101]:80... failed: Address family not supported by protocol. Retrying. Applications that use getaddrinfo() shouldn't even bother to know which family they use. Just should do getaddrinfo("host", ..., &res0); for (res = res0; res; res=res->ai_next) { s = socket(res->ai_family, res->ai_socktype, res->ai_protocol) if (s<0) continue if ((connect(s, res->ai_addr, res->ai_addrlen) <0 ) { close(s) continue) } break } This pseudo-code should show the idea. The best thing IMO is to use getaddrinfo for resolving + struct addrinfo (linked list) for storing data about host.x.y.com. For systems without getaddrinfo ipv4 only replacements should be provided - see openssh portable how it's done there. The whole idea of getaddrinfo/getnameinfo is to get family independent functions. They even work for AF_UNIX on some systems (like on linux+glibc). Anyway for now workaround is something like this in main(): #ifdef ENABLE_IPV6 s = socket(AF_INET6, SOCK_STREAM, 0); if (s < 0 && (errno == EAFNOSUPPORT)) ip_default_family = AF_INET; close(s); #endif -- Arkadiusz Miśkiewicz CS at FoE, Wroclaw University of Technology arekm.pld-linux.org AM2-6BONE, 1024/3DB19BBD, arekm(at)ircnet, PLD/Linux
