/* Internet Finger server
 * Copyright 1991 Phil Karn, KA9Q
 */
#include <stdio.h>
#include <string.h>
#include "global.h"
#include "files.h"
#include "mbuf.h"
#include "socket.h"
#include "session.h"
#include "proc.h"
#include "dirutil.h"
#include "commands.h"
#include "mailbox.h"

static int Sfinger = -1;	/* Prototype socket for service */

static void fingerd __ARGS((int s,void *unused,void *p));

/* Start up finger service */
int
finstart(argc,argv,p)
int argc;
char *argv[];
void *p;
{
	struct sockaddr_in lsocket;
	int s;

	if(Sfinger != -1){
		return 0;
	}
	psignal(Curproc,0);	/* Don't keep the parser waiting */
	chname(Curproc,"Finger listener");

	lsocket.sin_family = AF_INET;
	lsocket.sin_addr.s_addr = INADDR_ANY;
	if(argc < 2)
		lsocket.sin_port = IPPORT_FINGER;
	else
		lsocket.sin_port = atoi(argv[1]);

	Sfinger = socket(AF_INET,SOCK_STREAM,0);
	bind(Sfinger,(char *)&lsocket,sizeof(lsocket));
	listen(Sfinger,1);
	for(;;){
		if((s = accept(Sfinger,NULLCHAR,(int *)NULL)) == -1)
			break;	/* Service is shutting down */

		/* Spawn a server */
		newproc("fingerd",512,fingerd,s,NULL,NULL,0);
	}
	return 0;
}
static void
fingerd(s,unused,p)
int s;
void *unused;
void *p;
{
	char user[80];
	FILE *fp;
	char *file,*cp;

	sockmode(s,SOCK_ASCII);
	sockowner(s,Curproc);
	log(s,"open Finger");
	recvline(s,user,80);
	rip(user);
	if(strlen(user) == 0){
		fp = dir(Fdir,0);
		if(fp == NULLFILE)
			usprintf(s,"No finger information available\n");
		else
			usprintf(s,"Known users on this system:\n");
	} else {
		file = pathname(Fdir,user);
		cp = pathname(Fdir,"");
		/* Check for attempted security violation (e.g., somebody
		 * might be trying to finger "../ftpusers"!)
		 */
		if(strncmp(file,cp,strlen(cp)) != 0){
			fp = NULLFILE;
			usprintf(s,"Invalid user name %s\n",user);
		} else if((fp = fopen(file,READ_TEXT)) == NULLFILE)
			usprintf(s,"User %s not known\n",user);
		free(cp);
		free(file);
	}
	if(fp != NULLFILE){
		sendfile(fp,s,ASCII_TYPE,0);
		fclose(fp);
	}
	if(strlen(user) == 0 && Listusers != NULL)
		(*Listusers)(s);
	close_s(s);
	log(s,"close Finger");
}
int
fin0(argc,argv,p)
int argc;
char *argv[];
void *p;
{
	close_s(Sfinger);
	Sfinger = -1;
	return 0;
}