Support DNS names for PrrtSocket_bind().

prrt/proto/socket.c

@@ -9,6 +9,7 @@
 #include <linux/net_tstamp.h>
 #include <assert.h>
 #include <sys/ioctl.h>
+#include <netdb.h>
 #include "../defines.h"
 #include "../util/common.h"
 #include "../util/dbg.h"
@@ -126,10 +127,15 @@ bool PrrtSocket_bind(PrrtSocket *s, const char *ipAddress, const uint16_t port)
     struct sockaddr_in *address = calloc(1, size);
     check_mem(address);
 
-    // TODO: Allow DNS names to be passed as ipAddress.
+    struct hostent *host = gethostbyname(ipAddress);
+    check(host, "gethostbyname(%s): %s", ipAddress, hstrerror(h_errno));
+
+    char buf[16];
+    unsigned char* addr = (unsigned char*) host->h_addr;
+    snprintf(buf, 16, "%u.%u.%u.%u", addr[0], addr[1], addr[2], addr[3]);
 
     address->sin_family = AF_INET;
-    address->sin_addr.s_addr = inet_addr(ipAddress);
+    address->sin_addr.s_addr = inet_addr(buf);
     address->sin_port = htons((uint16_t) (port));
     s->address = address;
 

prrt/prrt.pyx

@@ -138,7 +138,12 @@ cdef class PrrtSocket:
         self._c_socket = cprrt.PrrtSocket_create(maximum_payload_size, target_delay_us)
         if thread_pinning:
             cprrt.PrrtSocket_enable_thread_pinning(self._c_socket)
-        cprrt.PrrtSocket_bind(self._c_socket, host.encode("utf8"), port)
+        if not cprrt.PrrtSocket_bind(self._c_socket, host.encode("utf8"), port):
+            # PrrtSocket_bind calls PrrtSocket_close on error
+            # so we need to set _c_socket to NULL because otherwise __dealloc__
+            # will attempt to call PrrtSocket_close again on the closed socket
+            self._c_socket = NULL
+            raise ValueError("PrrtSocket_bind failed")
 
     # Channel Properties
     property data_rate_btl_fwd: