/****************************************************************************
 * NCSA Mosaic for the X Window System                                      *
 * Software Development Group                                               *
 * National Center for Supercomputing Applications                          *
 * University of Illinois at Urbana-Champaign                               *
 * 605 E. Springfield, Champaign IL 61820                                   *
 * mosaic@ncsa.uiuc.edu                                                     *
 *                                                                          *
 * Copyright 1993-1995, Board of Trustees of the University of Illinois     *
 *                                                                          *
 * NCSA Mosaic software, both binary and source (hereafter, Software) is    *
 * copyrighted by The Board of Trustees of the University of Illinois       *
 * (UI), and ownership remains with the UI.                                 *
 *                                                                          *
 * The UI grants you (hereafter, Licensee) a license to use the Software    *
 * for academic, research and internal business purposes only, without a    *
 * fee.  Licensee may distribute the binary and source code (if released)   *
 * to third parties provided that the copyright notice and this statement   *
 * appears on all copies and that no charge is associated with such         *
 * copies.                                                                  *
 *                                                                          *
 * Licensee may make derivative works.  However, if Licensee distributes    *
 * any derivative work based on or derived from the Software, then          *
 * Licensee will (1) notify NCSA regarding its distribution of the          *
 * derivative work, and (2) clearly notify users that such derivative       *
 * work is a modified version and not the original NCSA Mosaic              *
 * distributed by the UI.                                                   *
 *                                                                          *
 * Any Licensee wishing to make commercial use of the Software should       *
 * contact the UI, c/o NCSA, to negotiate an appropriate license for such   *
 * commercial use.  Commercial use includes (1) integration of all or       *
 * part of the source code into a product for sale or license by or on      *
 * behalf of Licensee to third parties, or (2) distribution of the binary   *
 * code or source code to third parties that need it to utilize a           *
 * commercial product sold or licensed by or on behalf of Licensee.         *
 *                                                                          *
 * UI MAKES NO REPRESENTATIONS ABOUT THE SUITABILITY OF THIS SOFTWARE FOR   *
 * ANY PURPOSE.  IT IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED          *
 * WARRANTY.  THE UI SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY THE    *
 * USERS OF THIS SOFTWARE.                                                  *
 *                                                                          *
 * By using or copying this Software, Licensee agrees to abide by the       *
 * copyright law and all other applicable laws of the U.S. including, but   *
 * not limited to, export control laws, and the terms of this license.      *
 * UI shall have the right to terminate this license immediately by         *
 * written notice upon Licensee's breach of, or non-compliance with, any    *
 * of its terms.  Licensee may be held legally responsible for any          *
 * copyright infringement that is caused or encouraged by Licensee's        *
 * failure to abide by the terms of this license.                           *
 *                                                                          *
 * Comments and questions are welcome and can be sent to                    *
 * mosaic-x@ncsa.uiuc.edu.                                                  *
 ****************************************************************************/
#include "../config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "proxy.h"

#define BUFLEN 256
#define BLANKS " \t\n"

struct ProxyDomain *AddProxyDomain();

extern struct Proxy *proxy_list;

struct Proxy *
ReadProxies(char *filename)
{
	FILE *fp;
	char buf[BUFLEN], *psb;
	struct Proxy *head, *cur, *next, *p;
	struct ProxyDomain *pCurList, *pNewDomain;
	extern void FreeProxy();
		
	if ((fp = fopen(filename,"r")) == NULL)
		return NULL;

	head = NULL;
	cur = NULL;

	/*
	** read entries from the proxy list
	**
	** These malloc()s should be checked for returning NULL
	*/
	while (fgets(buf, BUFLEN, fp) != 0) {

		p = (struct Proxy *)calloc(1,sizeof(struct Proxy));
		
		p->next = NULL;
		p->prev = NULL;

		/*
		** Read the proxy scheme
		*/

		if ((psb = strtok(buf, BLANKS)) == NULL)
			return head;

		p->scheme = (char *)malloc(strlen(psb)+1);
		strcpy(p->scheme, psb);

		/*
		** Read the proxy address
		*/

		if ((psb = strtok(NULL, BLANKS)) == NULL)
			return head;
		p->address = (char *)malloc(strlen(psb)+1);
		strcpy(p->address, psb);

		/*
		** Read the proxy port
		*/

		if ((psb = strtok(NULL, BLANKS)) == NULL)
			return head;
		p->port = (char *)malloc(strlen(psb)+1);
		strcpy(p->port, psb);

		/*
		** Read the transport mechanism
		*/
		if ((psb = strtok(NULL, BLANKS)) == NULL)
			return head;
		p->transport = (char *)malloc(strlen(psb)+1);
		strcpy(p->transport, psb);

		p->alive = 0;

		if (strcmp(p->transport,"CCI") == 0)
			p->trans_val = TRANS_CCI;
		else
			p->trans_val = TRANS_HTTP;

		/*
		** Read the domain
		*/
		p->list = NULL;

		if ((psb = strtok(NULL, BLANKS)) != NULL) {

			p->list = NULL;
			AddProxyDomain(psb, &p->list);

			pCurList = p->list;

			while ((psb = strtok(NULL, BLANKS)) != NULL) {
				if (psb[0] == '\\') {
					if (fgets(buf, BUFLEN, fp) == 0) {
						return head;
					}
					psb = strtok(buf, BLANKS);
					if (psb == NULL)
						return head;
				}
				if (AddProxyDomain(psb, &pCurList) == NULL)
					return head;
			}
		}

		if (cur == NULL) {
			head = p;
			cur = p;
		} else {
			p->prev = cur;
			cur->next = p;
			cur = p;
		}
		if (feof(fp) != 0)
			break;
	}

	return(head);
}

struct Proxy *
ReadNoProxies(char *filename)
{
	FILE *fp;
	char buf[BUFLEN], *psb;
	struct Proxy *head, *cur, *next, *p;
	extern void FreeProxy();
		
	if ((fp = fopen(filename,"r")) == NULL)
		return NULL;

	head = NULL;
	cur = NULL;

	/*
	** read entries from the proxy list
	**
	** These malloc()s should be checked for returning NULL
	*/
	while (fgets(buf, BUFLEN, fp) != 0) {

		p = (struct Proxy *)calloc(1, sizeof(struct Proxy));
		
		p->next = NULL;
		p->prev = NULL;

		/*
		** The proxy protocol, transport, and list
		** are all null for no proxy.
		*/
		p->scheme = NULL;
		p->transport = NULL;
		p->list = NULL;

		/*
		** Read the proxy address
		*/

		if ((psb = strtok(buf, BLANKS)) == NULL)
			return head;
		p->address = (char *)malloc(strlen(psb)+1);
		strcpy(p->address, psb);

		/*
		** Read the proxy port
		*/

		if ((psb = strtok(NULL, BLANKS)) == NULL) {
			p->port = NULL;
		} else {
			p->port = (char *)malloc(strlen(psb)+1);
			strcpy(p->port, psb);
		}

		if (cur == NULL) {
			head = p;
			cur = p;
		} else {
			p->prev = cur;
			cur->next = p;
			cur = p;
		}
		if (feof(fp) != 0)
			break;
	}

	return(head);
}

struct ProxyDomain *
AddProxyDomain(char *sbDomain, struct ProxyDomain **pdList)
{
	struct ProxyDomain *pNewDomain;

	pNewDomain = (struct ProxyDomain *)malloc(sizeof(struct ProxyDomain));

	if (pNewDomain == NULL)
		return NULL;

	pNewDomain->domain = (char *)malloc(strlen(sbDomain)+1);
	strcpy(pNewDomain->domain, sbDomain);
	if (*pdList == NULL) {
		*pdList = pNewDomain;
		(*pdList)->next = NULL;
		(*pdList)->prev = NULL;
	} else {
		struct ProxyDomain *p;

		p = *pdList;

		while (p->next != NULL)
			p = p->next;
		pNewDomain->prev = p;
		pNewDomain->next = NULL;
		p->next = pNewDomain;
	}

	return pNewDomain;
}

void
DeleteProxyDomain(struct ProxyDomain *p)
{
	struct ProxyDomain *cur;

	cur = p;

	if (cur->next !=NULL)
		cur->next->prev =  p->prev;

	if (cur->prev !=NULL)
		cur->prev->next =  p->next;

	if (p->domain) {
		free(p->domain);
		p->domain = NULL;
	}

	free(p);

	p = NULL;
}


/*
 * Returns true if there is at least one fallback proxy for the specified
 *   protocol (means more than one proxy server specified).
 *
 * --SWP
 */
int has_fallbacks(char *protocol) {

int protocol_len;
struct Proxy *ptr;

	if (!protocol || !*protocol ||
	    !proxy_list) {
		return(0);
	}

	protocol_len=strlen(protocol);
	ptr=proxy_list;

	while (ptr) {
		if (ptr->scheme && !strncmp(ptr->scheme,protocol,protocol_len)) {
			return(1);
		}
		ptr=ptr->next;
	}

	return(0);
}
