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HAM Radio 3
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hamradioversion3.0examsandprograms1992.iso
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9q920411
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fingerd.c
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C/C++ Source or Header
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1991-03-17
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109 lines
/* 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;
}