3 files changed, 48 insertions, 0 deletions
diff --git a/src/lib/net/.may_include b/src/lib/net/.may_include
index 479f852939..1458dad990 100644
--- a/src/lib/net/.may_include
+++ b/src/lib/net/.may_include
@@ -5,6 +5,7 @@ ht.h
 lib/cc/*.h
 lib/container/*.h
 lib/ctime/*.h
+lib/err/*.h
 lib/lock/*.h
 lib/log/*.h
 lib/net/*.h
diff --git a/src/lib/net/socket.c b/src/lib/net/socket.c
index 4c14a42896..cd18d70839 100644
--- a/src/lib/net/socket.c
+++ b/src/lib/net/socket.c
@@ -7,6 +7,7 @@
 #include "lib/net/socket.h"
 #include "lib/net/address.h"
 #include "lib/cc/compat_compiler.h"
+#include "lib/err/torerr.h"
 #include "lib/lock/compat_mutex.h"
 #include "lib/log/torlog.h"
 #include "lib/log/util_bug.h"
@@ -647,3 +648,46 @@ set_socket_nonblocking(tor_socket_t sock)
 
   return 0;
 }
+
+/** Read from <b>sock</b> to <b>buf</b>, until we get <b>count</b> bytes or
+ * reach the end of the file.  Return the number of bytes read, or -1 on
+ * error. Only use if fd is a blocking fd. */
+ssize_t
+read_all_from_socket(tor_socket_t sock, char *buf, size_t count)
+{
+  size_t numread = 0;
+  ssize_t result;
+
+  if (count > SIZE_T_CEILING || count > SSIZE_MAX) {
+    errno = EINVAL;
+    return -1;
+  }
+
+  while (numread < count) {
+    result = tor_socket_recv(sock, buf+numread, count-numread, 0);
+    if (result<0)
+      return -1;
+    else if (result == 0)
+      break;
+    numread += result;
+  }
+  return (ssize_t)numread;
+}
+
+/** Write <b>count</b> bytes from <b>buf</b> to <b>sock</b>. Return the number
+ * of bytes written, or -1 on error.  Only use if fd is a blocking fd.  */
+ssize_t
+write_all_to_socket(tor_socket_t fd, const char *buf, size_t count)
+{
+  size_t written = 0;
+  ssize_t result;
+  raw_assert(count < SSIZE_MAX);
+
+  while (written != count) {
+    result = tor_socket_send(fd, buf+written, count-written, 0);
+    if (result<0)
+      return -1;
+    written += result;
+  }
+  return (ssize_t)count;
+}
diff --git a/src/lib/net/socket.h b/src/lib/net/socket.h
index 93af92983a..99b0de4ff9 100644
--- a/src/lib/net/socket.h
+++ b/src/lib/net/socket.h
@@ -52,6 +52,9 @@ int network_init(void);
 int get_max_sockets(void);
 void set_max_sockets(int);
 
+ssize_t write_all_to_socket(tor_socket_t fd, const char *buf, size_t count);
+ssize_t read_all_from_socket(tor_socket_t fd, char *buf, size_t count);
+
 /* For stupid historical reasons, windows sockets have an independent
  * set of errnos, and an independent way to get them.  Also, you can't
  * always believe WSAEWOULDBLOCK.  Use the macros below to compare