add a web page fetcher

apps/webget.cc

@@ -1,46 +1,64 @@
+#include "address.hh"
 #include "socket.hh"
 
 #include <cstdlib>
 #include <iostream>
 #include <span>
 #include <string>
+#include <sys/socket.h>
 
 using namespace std;
 
-void get_URL( const string& host, const string& path )
-{
-  cerr << "Function called: get_URL(" << host << ", " << path << ")\n";
-  cerr << "Warning: get_URL() has not been implemented yet.\n";
+void get_URL(const string &host, const string &path) {
+    TCPSocket tcpsocket{};
+    std::string buf;
+    const Address addr = Address(host, "http");
+    tcpsocket.connect(addr);
+    const std::string request = "GET " + path + " HTTP/1.1\r\n" +
+                                "Host: " + host +
+                                "\r\nConnection: close\r\n\r\n";
+    tcpsocket.write(request);
+    tcpsocket.shutdown(SHUT_WR);
+    while (!tcpsocket.eof()) {
+        tcpsocket.read(buf);
+        std::cout << buf;
+        buf.clear();
+    }
+    tcpsocket.close();
+    /*
+    cerr << "Function called: get_URL(" << host << ", " << path << ")\n";
+    cerr << "Warning: get_URL() has not been implemented yet.\n";
+    */
 }
 
-int main( int argc, char* argv[] )
-{
-  try {
-    if ( argc <= 0 ) {
-      abort(); // For sticklers: don't try to access argv[0] if argc <= 0.
-    }
+int main(int argc, char *argv[]) {
+    try {
+        if (argc <= 0) {
+            abort(); // For sticklers: don't try to access argv[0] if argc <= 0.
+        }
 
-    auto args = span( argv, argc );
+        auto args = span(argv, argc);
 
-    // The program takes two command-line arguments: the hostname and "path" part of the URL.
-    // Print the usage message unless there are these two arguments (plus the program name
-    // itself, so arg count = 3 in total).
-    if ( argc != 3 ) {
-      cerr << "Usage: " << args.front() << " HOST PATH\n";
-      cerr << "\tExample: " << args.front() << " stanford.edu /class/cs144\n";
-      return EXIT_FAILURE;
-    }
+        // The program takes two command-line arguments: the hostname and "path"
+        // part of the URL. Print the usage message unless there are these two
+        // arguments (plus the program name itself, so arg count = 3 in total).
+        if (argc != 3) {
+            cerr << "Usage: " << args.front() << " HOST PATH\n";
+            cerr << "\tExample: " << args.front()
+                 << " stanford.edu /class/cs144\n";
+            return EXIT_FAILURE;
+        }
 
-    // Get the command-line arguments.
-    const string host { args[1] };
-    const string path { args[2] };
+        // Get the command-line arguments.
+        const string host{args[1]};
+        const string path{args[2]};
 
-    // Call the student-written function.
-    get_URL( host, path );
-  } catch ( const exception& e ) {
-    cerr << e.what() << "\n";
-    return EXIT_FAILURE;
-  }
+        // Call the student-written function.
+        get_URL(host, path);
+    } catch (const exception &e) {
+        cerr << e.what() << "\n";
+        return EXIT_FAILURE;
+    }
 
-  return EXIT_SUCCESS;
+    return EXIT_SUCCESS;
 }