diff options
| -rw-r--r-- | libbb/xconnect.c | 19 | ||||
| -rw-r--r-- | networking/Config.in | 15 |
2 files changed, 31 insertions, 3 deletions
diff --git a/libbb/xconnect.c b/libbb/xconnect.c index cb5ac2c8e..91c12f4d3 100644 --- a/libbb/xconnect.c +++ b/libbb/xconnect.c @@ -125,6 +125,7 @@ USE_FEATURE_IPV6(sa_family_t af,) int rc; len_and_sockaddr *r = NULL; struct addrinfo *result = NULL; + struct addrinfo *used_res; const char *org_host = host; /* only for error msg */ const char *cp; struct addrinfo hint; @@ -169,9 +170,21 @@ USE_FEATURE_IPV6(sa_family_t af,) xfunc_die(); goto ret; } - r = xmalloc(offsetof(len_and_sockaddr, sa) + result->ai_addrlen); - r->len = result->ai_addrlen; - memcpy(&r->sa, result->ai_addr, result->ai_addrlen); + used_res = result; +#if ENABLE_FEATURE_PREFER_IPV4_ADDRESS + while (1) { + if (used_res->ai_family == AF_INET) + break; + used_res = used_res->ai_next; + if (!used_res) { + used_res = result; + break; + } + } +#endif + r = xmalloc(offsetof(len_and_sockaddr, sa) + used_res->ai_addrlen); + r->len = used_res->ai_addrlen; + memcpy(&r->sa, used_res->ai_addr, used_res->ai_addrlen); set_nport(r, htons(port)); ret: freeaddrinfo(result); diff --git a/networking/Config.in b/networking/Config.in index b5b4597c4..b50aacf9f 100644 --- a/networking/Config.in +++ b/networking/Config.in @@ -12,6 +12,21 @@ config FEATURE_IPV6 Enable IPv6 support in busybox. This adds IPv6 support in the networking applets. +config FEATURE_PREFER_IPV4_ADDRESS + bool "Preferentially use IPv4 addresses from DNS queries" + default y + depends on FEATURE_IPV6 + help + Use IPv4 address of network host if it has one. + + If this option is off, the first returned address will be used. + This may cause problems when your DNS server is IPv6-capable and + is returning IPv6 host addresses too. If IPv6 address + precedes IPv4 one in DNS reply, busybox network applets + (e.g. wget) will use IPv6 address. On an IPv6-incapable host + or network applets will fail to connect to the host + using IPv6 address. + config VERBOSE_RESOLUTION_ERRORS bool "Verbose resolution errors" default n |