libt2n: (gerd) add hello peek

[libt2n] / src / command_client.cpp

diff --git a/src/command_client.cpp b/src/command_client.cpp
index 77daf0d..376d3f9 100644 (file)
--- a/src/command_client.cpp
+++ b/src/command_client.cpp
@@ -67,30 +67,97 @@ std::string command_client::read_packet(const long long &usec_timeout)
 
 void command_client::read_hello()
 {
-    istringstream hello(read_packet(hello_timeout_usec));
+    string resultpacket;
+    bool got_packet=false;
+    long long my_timeout=hello_timeout_usec;
+    while(!(got_packet=c.get_packet(resultpacket)) && my_timeout > 0  && !c.is_closed())
+    {
+        c.fill_buffer(my_timeout,&my_timeout);
+
+        c.peek_packet(resultpacket);
+        check_hello(resultpacket);           // will throw before timeout if wrong data received
+    }
+
+    if (!got_packet)
+        throw t2n_transfer_error("timeout exceeded");
+
+    if (!check_hello(resultpacket))
+        throw t2n_version_mismatch("illegal hello received (incomplete): "+resultpacket);
+}
+
+bool command_client::check_hello(const string& hellostr)
+{
+    istringstream hello(hellostr);
 
-    char chk[5];
-    hello.read(chk,4);
-    chk[4]=0;
-    if (hello.fail() || hello.eof() || string("T2Nv") != chk)
-        throw t2n_version_mismatch("illegal hello received (T2N)");
+    char chk;
+
+    if (hello.read(&chk,1))
+    {
+        if (chk != 'T')
+            throw t2n_version_mismatch("illegal hello received (T2N)");
+    }
+    else
+        return false;
+
+    if (hello.read(&chk,1))
+    {
+        if (chk != '2')
+            throw t2n_version_mismatch("illegal hello received (T2N)");
+    }
+    else
+        return false;
+
+    if (hello.read(&chk,1))
+    {
+        if (chk != 'N')
+            throw t2n_version_mismatch("illegal hello received (T2N)");
+    }
+    else
+        return false;
+
+    if (hello.read(&chk,1))
+    {
+        if (chk != 'v')
+            throw t2n_version_mismatch("illegal hello received (T2N)");
+    }
+    else
+        return false;
 
     int prot_version;
-    hello >> prot_version;
-    if (hello.fail() || hello.eof() || prot_version != PROTOCOL_VERSION)
-        throw t2n_version_mismatch("not compatible with the server protocol version");
+    if (hello >> prot_version)
+    {
+        if (prot_version != PROTOCOL_VERSION)
+            throw t2n_version_mismatch("not compatible with the server protocol version");
+    }
+    else
+        return false;
+
+    if (hello.read(&chk,1))
+    {
+        if (chk != ';')
+            throw t2n_version_mismatch("illegal hello received (1. ;)");
+    }
+    else
+        return false;
 
-    hello.read(chk,1);
-    if (hello.fail() || hello.eof() || chk[0] != ';')
-        throw t2n_version_mismatch("illegal hello received (1. ;)");
+    unsigned int hbo;
+    if (hello.read((char*)&hbo,sizeof(hbo)))
+    {
+        if (hbo != 1)
+            throw t2n_version_mismatch("host byte order not matching");
+    }
+    else
+        return false;
 
-    hello.read(chk,4);
-    if (hello.fail() || hello.eof() || *((int*)chk) != 1)
-        throw t2n_version_mismatch("host byte order not matching");
+    if (hello.read(&chk,1))
+    {
+        if (chk != ';')
+            throw t2n_version_mismatch("illegal hello received (2. ;)");
+    }
+    else
+        return false;
 
-    hello.read(chk,1);
-    if (hello.fail() || hello.eof() || chk[0] != ';')
-        throw t2n_version_mismatch("illegal hello received (2. ;)");
+    return true;
 }
 
 void command_client::send_command(command* cmd, result_container &res)