initial web server skeleton

concurrency-webserver/src/wclient.c

@@ -0,0 +1,92 @@
+//
+// client.c: A very, very primitive HTTP client.
+// 
+// To run, try: 
+//      client hostname portnumber filename
+//
+// Sends one HTTP request to the specified HTTP server.
+// Prints out the HTTP response.
+//
+// For testing your server, you will want to modify this client.  
+// For example:
+// You may want to make this multi-threaded so that you can 
+// send many requests simultaneously to the server.
+//
+// You may also want to be able to request different URIs; 
+// you may want to get more URIs from the command line 
+// or read the list from a file. 
+//
+// When we test your server, we will be using modifications to this client.
+//
+
+#include "io_helper.h"
+
+#define MAXBUF (8192)
+
+//
+// Send an HTTP request for the specified file 
+//
+void client_send(int fd, char *filename) {
+    char buf[MAXBUF];
+    char hostname[MAXBUF];
+    
+    gethostname_or_die(hostname, MAXBUF);
+    
+    /* Form and send the HTTP request */
+    sprintf(buf, "GET %s HTTP/1.1\n", filename);
+    sprintf(buf, "%shost: %s\n\r\n", buf, hostname);
+    write_or_die(fd, buf, strlen(buf));
+}
+
+//
+// Read the HTTP response and print it out
+//
+void client_print(int fd) {
+    char buf[MAXBUF];  
+    int n;
+    
+    // Read and display the HTTP Header 
+    n = readline_or_die(fd, buf, MAXBUF);
+    while (strcmp(buf, "\r\n") && (n > 0)) {
+	printf("Header: %s", buf);
+	n = readline_or_die(fd, buf, MAXBUF);
+	
+	// If you want to look for certain HTTP tags... 
+	// int length = 0;
+	//if (sscanf(buf, "Content-Length: %d ", &length) == 1) {
+	//    printf("Length = %d\n", length);
+	//}
+    }
+    
+    // Read and display the HTTP Body 
+    n = readline_or_die(fd, buf, MAXBUF);
+    while (n > 0) {
+	printf("%s", buf);
+	n = readline_or_die(fd, buf, MAXBUF);
+    }
+}
+
+int main(int argc, char *argv[]) {
+    char *host, *filename;
+    int port;
+    int clientfd;
+    
+    if (argc != 4) {
+	fprintf(stderr, "Usage: %s <host> <port> <filename>\n", argv[0]);
+	exit(1);
+    }
+    
+    host = argv[1];
+    port = atoi(argv[2]);
+    filename = argv[3];
+    
+    /* Open a single connection to the specified host and port */
+    clientfd = open_client_fd_or_die(host, port);
+    
+    client_send(clientfd, filename);
+    client_print(clientfd);
+    
+    close_or_die(clientfd);
+    
+    exit(0);
+}