1 files changed, 71 insertions, 0 deletions

diff --git a/busybox/libbb/xconnect.c b/busybox/libbb/xconnect.c
new file mode 100644
index 000000000..09a1daad1
--- /dev/null
+++ b/busybox/libbb/xconnect.c
@@ -0,0 +1,71 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Connect to host at port using address resolution from getaddrinfo
+ *
+ */
+
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <errno.h>
+#include <netdb.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include "libbb.h"
+
+/* Return network byte ordered port number for a service.
+ * If "port" is a number use it as the port.
+ * If "port" is a name it is looked up in /etc/services, if it isnt found return
+ * default_port
+ */
+unsigned short bb_lookup_port(const char *port, const char *protocol, unsigned short default_port)
+{
+        unsigned short port_nr = htons(default_port);
+        if (port) {
+                char *endptr;
+                int old_errno;
+                long port_long;
+
+                /* Since this is a lib function, we're not allowed to reset errno to 0.
+                 * Doing so could break an app that is deferring checking of errno. */
+                old_errno = errno;
+                errno = 0;
+                port_long = strtol(port, &endptr, 10);
+                if (errno != 0 || *endptr!='\0' || endptr==port || port_long < 0 || port_long > 65535) {
+                        struct servent *tserv = getservbyname(port, protocol);
+                        if (tserv) {
+                                port_nr = tserv->s_port;
+                        }
+                } else {
+                        port_nr = htons(port_long);
+                }
+                errno = old_errno;
+        }
+        return port_nr;
+}
+
+void bb_lookup_host(struct sockaddr_in *s_in, const char *host)
+{
+        struct hostent *he;
+
+        memset(s_in, 0, sizeof(struct sockaddr_in));
+        s_in->sin_family = AF_INET;
+        he = xgethostbyname(host);
+        memcpy(&(s_in->sin_addr), he->h_addr_list[0], he->h_length);
+}
+
+int xconnect(struct sockaddr_in *s_addr)
+{
+        int s = socket(AF_INET, SOCK_STREAM, 0);
+        if (connect(s, (struct sockaddr_in *)s_addr, sizeof(struct sockaddr_in)) < 0)
+        {
+                bb_perror_msg_and_die("Unable to connect to remote host (%s)",
+                                inet_ntoa(s_addr->sin_addr));
+        }
+        return s;
+}