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authorDenis Vlasenko <vda.linux@googlemail.com>2007-06-05 20:08:11 +0000
committerDenis Vlasenko <vda.linux@googlemail.com>2007-06-05 20:08:11 +0000
commit5c51a7ca52beb6958fda45f0de480f6ac1769ec6 (patch)
tree55bc26e011712115ecdfcb01588f9f65f6397462
parent6c501a71ae50fa8f788bbc46511e8c4071e5f897 (diff)
downloadbusybox-5c51a7ca52beb6958fda45f0de480f6ac1769ec6.tar.gz
nc: make connecting to IPv4 from IPv6-enabled hosts easier
(was requiring -s <local addr>)
-rw-r--r--include/libbb.h9
-rw-r--r--libbb/xconnect.c32
-rw-r--r--networking/nc_bloaty.c21
3 files changed, 38 insertions, 24 deletions
diff --git a/include/libbb.h b/include/libbb.h
index 013633716..dd0f5c1cc 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -304,9 +304,12 @@ enum {
}
)
};
-/* Create stream socket, and allocated suitable lsa
- * (lsa of correct size and lsa->sa.sa_family (AF_INET/AF_INET6)) */
-int xsocket_type(len_and_sockaddr **lsap, int sock_type);
+/* Create stream socket, and allocate suitable lsa.
+ * (lsa of correct size and lsa->sa.sa_family (AF_INET/AF_INET6))
+ * af == AF_UNSPEC will result in trying to create IPv6, and
+ * if kernel doesn't support it, IPv4.
+ */
+int xsocket_type(len_and_sockaddr **lsap, USE_FEATURE_IPV6(int af,) int sock_type);
int xsocket_stream(len_and_sockaddr **lsap);
/* Create server socket bound to bindaddr:port. bindaddr can be NULL,
* numeric IP ("N.N.N.N") or numeric IPv6 address,
diff --git a/libbb/xconnect.c b/libbb/xconnect.c
index e7d510678..b90aa9add 100644
--- a/libbb/xconnect.c
+++ b/libbb/xconnect.c
@@ -208,23 +208,31 @@ len_and_sockaddr* xdotted2sockaddr(const char *host, int port)
return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
}
-int xsocket_type(len_and_sockaddr **lsap, int sock_type)
+int xsocket_type(len_and_sockaddr **lsap, USE_FEATURE_IPV6(int family,) int sock_type)
{
+ SKIP_FEATURE_IPV6(enum { family = AF_INET };)
len_and_sockaddr *lsa;
int fd;
- int len = sizeof(struct sockaddr_in);
- int family = AF_INET;
+ int len;
#if ENABLE_FEATURE_IPV6
- fd = socket(AF_INET6, sock_type, 0);
- if (fd >= 0) {
- len = sizeof(struct sockaddr_in6);
- family = AF_INET6;
- } else
+ if (family == AF_UNSPEC) {
+ fd = socket(AF_INET6, sock_type, 0);
+ if (fd >= 0) {
+ family = AF_INET6;
+ goto done;
+ }
+ family = AF_INET;
+ }
#endif
- {
- fd = xsocket(AF_INET, sock_type, 0);
+ fd = xsocket(family, sock_type, 0);
+ len = sizeof(struct sockaddr_in);
+#if ENABLE_FEATURE_IPV6
+ if (family == AF_INET6) {
+ done:
+ len = sizeof(struct sockaddr_in6);
}
+#endif
lsa = xzalloc(offsetof(len_and_sockaddr, sa) + len);
lsa->len = len;
lsa->sa.sa_family = family;
@@ -234,7 +242,7 @@ int xsocket_type(len_and_sockaddr **lsap, int sock_type)
int xsocket_stream(len_and_sockaddr **lsap)
{
- return xsocket_type(lsap, SOCK_STREAM);
+ return xsocket_type(lsap, USE_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
}
static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
@@ -247,7 +255,7 @@ static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
/* user specified bind addr dictates family */
fd = xsocket(lsa->sa.sa_family, sock_type, 0);
} else {
- fd = xsocket_type(&lsa, sock_type);
+ fd = xsocket_type(&lsa, USE_FEATURE_IPV6(AF_UNSPEC,) sock_type);
set_nport(lsa, htons(port));
}
setsockopt_reuseaddr(fd);
diff --git a/networking/nc_bloaty.c b/networking/nc_bloaty.c
index 5096e3227..a318c8126 100644
--- a/networking/nc_bloaty.c
+++ b/networking/nc_bloaty.c
@@ -751,6 +751,13 @@ int nc_main(int argc, char **argv)
/* We manage our fd's so that they are never 0,1,2 */
/*bb_sanitize_stdio(); - not needed */
+ if (argv[0]) {
+ themaddr = xhost2sockaddr(argv[0],
+ argv[1]
+ ? bb_lookup_port(argv[1], o_udpmode ? "udp" : "tcp", 0)
+ : 0);
+ }
+
/* create & bind network socket */
x = (o_udpmode ? SOCK_DGRAM : SOCK_STREAM);
if (option_mask32 & OPT_s) { /* local address */
@@ -758,7 +765,11 @@ int nc_main(int argc, char **argv)
ouraddr = xhost2sockaddr(str_s, o_lport);
x = xsocket(ouraddr->sa.sa_family, x, 0);
} else {
- x = xsocket_type(&ouraddr, x);
+ /* We try IPv6, then IPv4, unless addr family is
+ * implicitly set by way of remote addr/port spec */
+ x = xsocket_type(&ouraddr,
+ USE_FEATURE_IPV6((themaddr ? themaddr->sa.sa_family : AF_UNSPEC),)
+ x);
if (o_lport)
set_nport(ouraddr, htons(o_lport));
}
@@ -789,14 +800,6 @@ int nc_main(int argc, char **argv)
xmove_fd(xopen(str_o, O_WRONLY|O_CREAT|O_TRUNC), ofd);
#endif
- if (argv[0]) {
- themaddr = xhost2sockaddr(argv[0],
- argv[1]
- ? bb_lookup_port(argv[1], o_udpmode ? "udp" : "tcp", 0)
- : 0);
-///what if sa_family won't match??
- }
-
if (o_listen) {
dolisten();
/* dolisten does its own connect reporting */