1 files changed, 130 insertions, 0 deletions
diff --git a/sock.c b/sock.c
new file mode 100644
index 0000000..03a7c39
--- /dev/null
+++ b/sock.c
@@ -0,0 +1,130 @@
+/*
+    Reader/writer to TCP/IP socket
+*/
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <netdb.h>
+
+#include <stdio.h>
+#include <errno.h>
+
+char	*name;
+int	sock;
+
+char	*GetLine();
+int	Connect();
+
+main(argc,argv)
+int argc;
+char *argv[];
+
+{
+    struct sockaddr_in addr;
+    int addrlen;
+    char *p;
+    char buff[1024];
+    int len;
+
+    name=argv[0];
+
+    if (argc<3)
+	{
+	fprintf(stderr,"%s: usage %s host port [nowrite]\n",name,name);
+	exit(1);
+	}
+
+    Connect(argv[1],atoi(argv[2]));
+
+    /* Test to see how to get the connected local port number
+    */
+    addrlen=sizeof(addr);
+    if (getsockname(sock,&addr,&addrlen)!=0)
+	perror(name);
+
+    printf("%s: bound through port %d\n",name,ntohs(addr.sin_port));
+
+    while((argc==4)||(p=GetLine()))
+	{
+	if ((argc!=4)&&(write(sock,p,strlen(p))==-1))
+	    {
+	    perror(name);
+	    close(sock);
+	    exit(1);
+	    }
+
+	if ((len=read(sock,buff,1024))<=0)
+	    {
+	    perror(name);
+	    close(sock);
+	    exit(1);
+	    }
+	buff[len]=0;
+	printf("%s\n",buff);
+	}
+
+    close(sock);
+    printf("\n");
+
+    return(0);
+}
+
+
+char *GetLine()
+
+{
+    static char buff[1024];
+    int l;
+
+    if (feof(stdin))
+	return(NULL);
+
+    printf("> ");
+
+    if (!gets(buff))
+	return(NULL);
+
+    l=strlen(buff);
+
+    if (buff[l-1]=='\n')
+	buff[l-1]=0;
+
+    if (strlen(buff))
+	return(buff);
+    else
+	return(GetLine());
+}
+
+
+int Connect(n,p)
+char *n;
+int p;
+
+{
+    struct hostent *remote;
+    struct sockaddr_in addr;
+
+    if (!(remote=gethostbyname(n)))
+	{
+	fprintf(stderr,"%s: unknown host %s\n",name,n);
+	exit(1);
+	}
+
+    bcopy(remote->h_addr,&addr.sin_addr,remote->h_length);
+
+    if ((sock=socket(AF_INET,SOCK_STREAM,0))==-1)
+	{
+	perror(name);
+	exit(1);
+	}
+
+    addr.sin_family=AF_INET;
+    addr.sin_port=htons(p);
+
+    if (connect(sock,&addr,sizeof(addr))==-1)
+	{
+	perror(name);
+	exit(1);
+	}
+}