Create the first assignment: 'timeserver'

timeserver/Makefile

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+CC = gcc -Wall -std=c99 -pedantic
+SOURCES = timeserver.c 
+OBJECTS = timeserver.o 
+
+all: timeserver
+
+timeserver: $(OBJECTS)
+	$(CC) $(OBJECTS) -o timeserver
+
+timeserver.o: timeserver.c
+	$(CC) -c timeserver.c -o timeserver.o
+
+clean:
+	rm -f $(OBJECTS) timeserver timeserver.out
+
+clean_objects:
+	rm -f $(OBJECTS)
+
+run:
+	./timeserver

timeserver/README.md

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+# Running the timeserver
+Use `make` to compile the timeserver.
+Use `make run` to run the timeserver. This will run on an infinite loop.
+Use `Ctrl+C` to stop the timeserver.
+
+## timeserver communication
+Communicating with the server can happen using netcat in UDP mode (-u flag).
+
+## timeserver information
+The timeserver runs on UDP port 8888.
+The timeserver will wait for `time\r\n` to be sent on this port, and if received,
+will send back a response of the time (in ms) since January 1st, 1970 (UNIX Epoch).
+
+## pcap information
+A demonstration of the timeserver has been captured with Wireshark in the 
+included `demo.pcap` file.

timeserver/timeserver.c

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+// header files
+#include "timeserver.h"
+
+// constants
+// timeserver port is 8888
+#define TIMEPORT "8888"
+
+// prototypes
+
+// main function
+int main(int argc, char **argv)
+{
+    // initialize program (variables and structs)
+    // define a UDP socket
+    // bind the UDP socket to port 8888 / TIMEPORT
+    // while loop to see if the "time\r\n" has been received (recv call?)
+        // if "time\r\n" is received, then send() back the linux epoch.
+    // profit???
+    return 0;
+}
+
+// function definitions
+
+/*
+Name: ???
+Process: ???
+Function Input/Parameters: ???
+Function Output/Parameters: ???
+Function Output/Returned: ???
+Device Input/Device: ???
+Device Output/Device: ???
+Dependencies: ???
+*/

timeserver/timeserver.h

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+#ifndef TIMESERVER
+#define TIMESERVER
+
+// included libraries
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <stdbool.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <time.h>
+#include <unistd.h>
+#include <errno.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+// data structures
+
+// function prototypes
+
+#endif // TIMESERVER