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nc: make connecting to IPv4 from IPv6-enabled hosts easier

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(was requiring -s <local addr>)
This commit is contained in:
Denis Vlasenko 2007-06-05 20:08:11 +00:00
parent 6c501a71ae
commit 5c51a7ca52
3 changed files with 39 additions and 25 deletions
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9
include/libbb.h
View File

@ -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,

34
libbb/xconnect.c
View File

@ -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
#endif
{
fd = xsocket(AF_INET, sock_type, 0);
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(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);

21
networking/nc_bloaty.c
View File

@ -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 */