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path: root/networking/telnetd.c
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Diffstat (limited to 'networking/telnetd.c')
-rw-r--r--networking/telnetd.c86
1 files changed, 65 insertions, 21 deletions
diff --git a/networking/telnetd.c b/networking/telnetd.c
index 549488507..d524ac891 100644
--- a/networking/telnetd.c
+++ b/networking/telnetd.c
@@ -37,10 +37,8 @@
#define BUFSIZE 4000
#if ENABLE_FEATURE_IPV6
-#define SOCKET_TYPE AF_INET6
typedef struct sockaddr_in6 sockaddr_type;
#else
-#define SOCKET_TYPE AF_INET
typedef struct sockaddr_in sockaddr_type;
#endif
@@ -357,31 +355,77 @@ free_session(struct tsession *ts)
}
static int
-create_socket(int port, const char *opt_bindaddr)
+dotted2sockaddr(const char *dotted, struct sockaddr* sp, int socklen)
+{
+ union {
+ struct in_addr a4;
+#if ENABLE_FEATURE_IPV6
+ struct in6_addr a6;
+#endif
+ } a;
+
+#if ENABLE_FEATURE_IPV6
+ if (socklen >= sizeof(struct sockaddr_in6)
+ && inet_pton(AF_INET6, dotted, &a) > 0
+ ) {
+ ((struct sockaddr_in6*)sp)->sin6_family = AF_INET6;
+ ((struct sockaddr_in6*)sp)->sin6_addr = a.a6;
+ } else
+#endif
+ if (socklen >= sizeof(struct sockaddr_in)
+ && inet_pton(AF_INET, dotted, &a) > 0
+ ) {
+ ((struct sockaddr_in*)sp)->sin_family = AF_INET;
+ ((struct sockaddr_in*)sp)->sin_addr = a.a4;
+ } else
+ return 1;
+
+ return 0; /* success */
+}
+
+static int
+xsocket_stream_ip4or6(sa_family_t *fp)
+{
+ int fd = socket(AF_INET6, SOCK_STREAM, 0);
+ if (fp) *fp = AF_INET6;
+ if (fd < 0) {
+ fd = xsocket(AF_INET, SOCK_STREAM, 0);
+ if (fp) *fp = AF_INET;
+ }
+ return fd;
+}
+
+static int
+create_socket(const char *hostaddr, int port)
{
static const int on = 1;
int fd;
- sockaddr_type sa;
-#if !ENABLE_FEATURE_IPV6
- struct in_addr bind_addr = { .s_addr = 0x0 };
+ union {
+ struct sockaddr sa;
+ struct sockaddr_in sin;
+#if ENABLE_FEATURE_IPV6
+ struct sockaddr_in6 sin6;
+#endif
+ } sa;
- /* TODO: generic string -> sockaddr converter */
- if (opt_bindaddr && inet_aton(opt_bindaddr, &bind_addr) == 0)
+ memset(&sa, 0, sizeof(sa));
+ if (hostaddr && dotted2sockaddr(hostaddr, &sa.sa, sizeof(sa)))
bb_show_usage();
-#endif
- fd = xsocket(SOCKET_TYPE, SOCK_STREAM, 0);
+
+ if (!sa.sa.sa_family)
+ fd = xsocket_stream_ip4or6(&sa.sa.sa_family);
+ else /* user specified -b ADDR dictates family */
+ fd = xsocket(sa.sa.sa_family, SOCK_STREAM, 0);
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
- memset((void *)&sa, 0, sizeof(sa));
+
#if ENABLE_FEATURE_IPV6
- sa.sin6_family = AF_INET6;
- sa.sin6_port = htons(port);
- /* sa.sin6_addr = bind_addr6; */
-#else
- sa.sin_family = AF_INET;
- sa.sin_port = htons(port);
- sa.sin_addr = bind_addr;
+ if (sa.sa.sa_family == AF_INET6)
+ sa.sin6.sin6_port = htons(port);
#endif
- xbind(fd, (struct sockaddr *) &sa, sizeof(sa));
+ if (sa.sa.sa_family == AF_INET)
+ sa.sin.sin_port = htons(port);
+
+ xbind(fd, &sa.sa, sizeof(sa));
xlisten(fd, 1);
return fd;
}
@@ -390,7 +434,7 @@ create_socket(int port, const char *opt_bindaddr)
/* Never actually called */
void free_session(struct tsession *ts);
-int create_socket(int port, const char *opt_bindaddr);
+int create_socket(const char *hostaddr, int port);
#endif
@@ -447,7 +491,7 @@ telnetd_main(int argc, char **argv)
if (IS_INETD) {
sessions = make_new_session(0, 1);
} else {
- master_fd = create_socket(portnbr, opt_bindaddr);
+ master_fd = create_socket(opt_bindaddr, portnbr);
if (!(opt & OPT_FOREGROUND))
xdaemon(0, 0);
}