Lab6-Part1

#Lab6part1.txt

Part 1: mdb-lookup-server using sockets API
-------------------------------------------

Now that you learned how to use sockets API, it's time to implement a
real mdb-lookup-server that does not rely on netcat tool.

Your job is to write mdb-lookup-server.c, a program that does the same
thing as mdb-lookup.c from lab 4, except that it communicates with the
client via a socket rather than standard I/O streams.

You start the mdb-lookup-server as follows:

    $ ./mdb-lookup-server my-mdb 8888

where my-mdb is the database file name and 8888 is the port number
that server should listen on. You can use netcat to connect to the
server and use the lookup service.  

For this part, it's okay for the server to handle only a single client
at a time, so you don't need to fork().

This part is an exercise in combining existing code to make something new.
There is actually very little code you need to write.  Basically, you
combine mdb-lookup.c from lab 4 solution with the boilerplate TCP server
code we studied in class. Here is how:

- Every time you get a socket from accept(), you basically run the code for
  mdb-lookup.  That is, you open the database file, read all records into
  memory, run the lookup loop, and finally clean up resources when the
  client is done using the lookup service.  When you're done with mdb-lookup
  code, you will go back to accept() in order to service the next client.

The main thing you need to do is to convert the mdb-lookup code to
read and write using the socket rather than stdin and stdout.

- For reading, the easiest thing to do is to wrap the socket file descriptor
  with a FILE*, so that we can leave the fgets() code alone.  fdopen() does
  exactly that:

      FILE *input = fdopen(socket_descriptor, "r");

  will give you a FILE* that you can use in place of stdin.

  When you're done, you should fclose(input), which will close the
  underlying socket for you.

- For output, you need to use send() instead of printf().  Here, the
  easiest thing to do is to use snprintf() to first print to a char
  array and then send() what you just printed.  Note that, on success,
  snprintf() returns the number of characters printed.

We will use this mdb-lookup-server in lab 7, where we write a web
server which can not only serve static HTML pages, but also serve
mdb-lookup results to web browsers.  In order to use mdb-lookup-server
in conjunction with a web server in lab 7, we need to do two things
when we write mdb-lookup-server now:

- Do NOT send the "lookup:" prompt to the client.  Simply read the
  input line (which contains the search word) from the socket, send
  all the search result lines to the socket, and finally send a blank
  line to the socket.  The blank line at the end is important: the web
  server will use it to determine the end of a search result.

- Add the following lines in the beginning of your main():

    // ignore SIGPIPE so that we don't terminate when we call
    // send() on a disconnected socket.
    if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) 
	die("signal() failed");

Makefile

#
# Makefile for lab 6, part 1
#

CC  = gcc
CXX = g++

INCLUDES = -I../../lab3/solutions/part1
CFLAGS   = -g -Wall $(INCLUDES)
CXXFLAGS = -g -Wall $(INCLUDES)

LDFLAGS = -g -L../../lab3/solutions/part1
LDLIBS = -lmylist

.PHONY: default
default: mdb-lookup-server

# header dependency
mdb-lookup-server.o: mdb.h

.PHONY: clean
clean:
	rm -f *.o *~ a.out core mdb-lookup-server

.PHONY: all
all: clean default

mdb-cs3157

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mdb-lookup-server.c

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>

#include "mylist.h"
#include "mdb.h"

int loadmdb(FILE *fp, struct List *dest)
{
    /*
     * read all records into memory
     */

    struct MdbRec r;
    struct Node *node = NULL;
    int count = 0;

    while (fread(&r, sizeof(r), 1, fp) == 1) {

        // allocate memory for a new record and copy into it the one
        // that was just read from the database.
        struct MdbRec *rec = (struct MdbRec *)malloc(sizeof(r));
        if (!rec)
            return -1;
        memcpy(rec, &r, sizeof(r));

        // add the record to the linked list.
        node = addAfter(dest, node, rec);
        if (node == NULL)
            return -1;

        count++;
    }

    // see if fread() produced error
    if (ferror(fp))
        return -1;

    return count;
}


void freemdb(struct List *list)
{
    // free all the records
    traverseList(list, &free);
    removeAllNodes(list);
}


static void die(const char *s) { perror(s); exit(1); }

int main(int argc, char **argv)
{
	if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
		die("signal() failed");

	if (argc != 2) {
		fprintf(stderr, "usage: %s <server-port>\n", argv[0]);
	}

	unsigned short port = atoi(argv[2]);
	char *filename = argv[1];

	int servsock;
	if ((servsock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
		die("socket failed");

	struct sockaddr_in servaddr;
	memset(&servaddr, 0, sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
	servaddr.sin_port = htons(port);

	if (bind(servsock, (struct sockaddr *) &servaddr, sizeof(servaddr)) < 0)
		die("bind failed");

	if (listen(servsock, 1) < 0) // not sure what the queue size is bc the spec says its ok if the server only needs to handle one client at a time
		die("listen failed");

	int KeyMax = 5;

	int clntsock;
	socklen_t clntlen;
	struct sockaddr_in clntaddr;

	while(1) {

		fprintf(stderr, "waiting for client ... ");
		clntlen = sizeof(clntaddr);

		if ((clntsock = accept(servsock, (struct sockaddr *) &clntaddr, &clntlen)) < 0)
			die("accept failed");

		fprintf(stderr, "client ip: %s\n", inet_ntoa(clntaddr.sin_addr));	

		//FILE *input = fdopen(clntsock, "r");

	//	r = recv(clntsock, buf, sizeof(buf), 0);
			//mdb-lookup from lab 4

		FILE *input = fdopen(clntsock, "r"); //idk if i'm supposed to use clntsock
			
		FILE *fp = fopen(filename, "rb");
    		if (fp == NULL)
       			die(filename);

		struct List list;
		initList(&list);

		int loaded = loadmdb(fp, &list);
    
		if (loaded < 0)
			die("loadmdb");

		fclose(fp);

		char line[1000];
		char key[KeyMax + 1];

			//printf("lookup: "); //CHANGE THIS
			//fflush(stdout); //i cant tell if i need these anymore or not
		char a[1000];
		while (fgets(line, sizeof(line), input) != NULL) {

			strncpy(key, line, sizeof(key) - 1);
			key[sizeof(key) - 1] = '\0';

			size_t last = strlen(key) - 1;
			if (key[last] == '\n')
				key[last] = '\0';

			struct Node *node = list.head;
			int recNo = 1;
			int linelen;
			int printlen;
			while (node) {
				struct MdbRec *rec = (struct MdbRec *)node->data;
				if (strstr(rec->name, key) || strstr(rec->msg, key)) {
					linelen = snprintf(a, 1000, "%4d: {%s} said {%s}\n", recNo, rec->name, rec->msg);
					printlen = send(clntsock, a, linelen, 0);
					if(linelen != printlen)
						fprintf(stderr, "ERROR: send failed \n");
				}
				node = node->next;
				recNo++;
			}

			linelen = snprintf(a, 1000, "\n");
			printlen = send(clntsock, a, linelen, 0);
			if(linelen != printlen)
				die("send failed");	
				//printf("\nlookup: ");
				//fflush(stdout);
		}

		if (ferror(input))
			die("input");

		freemdb(&list);

			//end of mdb lookup


	
	}

}

mdb.h

/*
 * mdb.h
 */

#ifndef _MDB_H_
#define _MDB_H_

struct MdbRec {
    char name[16];
    char  msg[24];
};

#endif /* _MDB_H_ */