1 files changed, 139 insertions, 0 deletions
diff --git a/user_call/tcp_call.c b/user_call/tcp_call.c
new file mode 100644
index 0000000..c3b5e3c
--- /dev/null
+++ b/user_call/tcp_call.c
@@ -0,0 +1,139 @@
+#include <stdlib.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <signal.h>
+#include <netdb.h>
+
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+
+#include "user_io.h"
+
+void alarm_handler(int sig)
+{
+}
+
+int main(int argc, char **argv)
+{
+	char buffer[256];
+	int s, addrlen = sizeof(struct sockaddr_in);
+	struct sockaddr_in addr;
+	struct hostent *hp;
+	struct servent *sp;
+	int verbose = 1;
+
+	paclen_in = 1024;
+	paclen_out = 1024;
+
+	while ((s = getopt(argc, argv, "ci:o:q")) != -1) {
+		switch (s) {
+		case 'c':
+			init_compress();
+			compression = 1;
+			break;
+		case 'i':
+			paclen_in = atoi(optarg);
+			break;
+		case 'o':
+			paclen_out = atoi(optarg);
+			break;
+		case 'q':
+			verbose = 0;
+			break;
+		case ':':
+		case '?':
+			err("ERROR: invalid option usage\n");
+			return 1;
+		}
+	}
+
+	if (paclen_in < 1 || paclen_out < 1) {
+		err("ERROR: invalid paclen\n");
+		return 1;
+	}
+
+	/*
+	 * Arguments should be "tcp_call remaddr remport"
+	 */
+	if ((argc - optind) != 2) {
+		strcpy(buffer, "ERROR: invalid number of parameters\n");
+		err(buffer);
+	}
+
+	/*
+	 * Open the socket into the kernel.
+	 */
+	if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
+		sprintf(buffer, "ERROR: can't open socket: %s\n", strerror(errno));
+		err(buffer);
+	}
+
+	/*
+	 * Resolve the hostname.
+	 */
+	hp = gethostbyname(argv[optind]);
+	if (hp == NULL) {
+		err("ERROR: Unknown host\n");
+	}
+	addr.sin_family = AF_INET;
+	addr.sin_addr.s_addr = ((struct in_addr *)(hp->h_addr))->s_addr;
+
+	/*
+	 * And the service name.
+	 */
+	if ((sp = getservbyname(argv[optind+1], "tcp")) != NULL)
+		addr.sin_port = sp->s_port;
+	else
+		addr.sin_port = htons(atoi(argv[optind+1]));
+
+	if (addr.sin_port == 0) {
+		err("ERROR: Unknown service\n");
+	}
+
+	if (verbose) {
+		sprintf(buffer, "*** Connecting to %s ...\n", hp->h_name);
+		user_write(STDOUT_FILENO, buffer, strlen(buffer));
+	}
+
+	/*
+	 * If no response in 30 seconds, go away.
+	 */
+	alarm(30);
+
+	signal(SIGALRM, alarm_handler);
+
+	/*
+	 * Lets try and connect to the far end.
+	 */
+	if (connect(s, (struct sockaddr *)&addr, addrlen) != 0) {
+		sprintf(buffer, "ERROR: can't connect: %s\n", strerror(errno));
+		err(buffer);
+	}
+
+	/*
+	 * We got there.
+	 */
+	alarm(0);
+
+	if (verbose) {
+		strcpy(buffer, "*** Connected\n");
+		user_write(STDOUT_FILENO, buffer, strlen(buffer));
+	}
+
+	select_loop(s);
+
+	if (verbose) {
+		strcpy(buffer, "\n*** Disconnected\n");
+		user_write(STDOUT_FILENO, buffer, strlen(buffer));
+	}
+
+	end_compress();
+
+	return 0;
+}