118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/*
|
|
* Copyright (c) 1989 Regents of the University of California.
|
|
* All rights reserved. The Berkeley software License Agreement
|
|
* specifies the terms and conditions for redistribution.
|
|
*/
|
|
|
|
#include <popper.h>
|
|
RCSID("$Id: popper.c,v 1.15 1997/05/11 11:04:37 assar Exp $");
|
|
|
|
int hangup = FALSE ;
|
|
|
|
static RETSIGTYPE
|
|
catchSIGHUP(int sig)
|
|
{
|
|
hangup = TRUE ;
|
|
|
|
/* This should not be a problem on BSD systems */
|
|
signal(SIGHUP, catchSIGHUP);
|
|
signal(SIGPIPE, catchSIGHUP);
|
|
SIGRETURN(0);
|
|
}
|
|
|
|
int pop_timeout = POP_TIMEOUT;
|
|
|
|
jmp_buf env;
|
|
|
|
static RETSIGTYPE
|
|
ring(int sig)
|
|
{
|
|
longjmp(env,1);
|
|
}
|
|
|
|
/*
|
|
* fgets, but with a timeout
|
|
*/
|
|
static char *
|
|
tgets(char *str, int size, FILE *fp, int timeout)
|
|
{
|
|
signal(SIGALRM, ring);
|
|
alarm(timeout);
|
|
if (setjmp(env))
|
|
str = NULL;
|
|
else
|
|
str = fgets(str,size,fp);
|
|
alarm(0);
|
|
signal(SIGALRM,SIG_DFL);
|
|
return(str);
|
|
}
|
|
|
|
/*
|
|
* popper: Handle a Post Office Protocol version 3 session
|
|
*/
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
POP p;
|
|
state_table * s;
|
|
char message[MAXLINELEN];
|
|
|
|
signal(SIGHUP, catchSIGHUP);
|
|
signal(SIGPIPE, catchSIGHUP);
|
|
|
|
/* Start things rolling */
|
|
pop_init(&p,argc,argv);
|
|
|
|
/* Tell the user that we are listenting */
|
|
pop_msg(&p,POP_SUCCESS,
|
|
"UCB based pop server (version %s at %s) starting.",VERSION,p.myhost);
|
|
|
|
/* State loop. The POP server is always in a particular state in
|
|
which a specific suite of commands can be executed. The following
|
|
loop reads a line from the client, gets the command, and processes
|
|
it in the current context (if allowed) or rejects it. This continues
|
|
until the client quits or an error occurs. */
|
|
|
|
for (p.CurrentState=auth1;p.CurrentState!=halt&&p.CurrentState!=error;) {
|
|
if (hangup) {
|
|
pop_msg(&p, POP_FAILURE, "POP hangup: %s", p.myhost);
|
|
if (p.CurrentState > auth2 && !pop_updt(&p))
|
|
pop_msg(&p, POP_FAILURE,
|
|
"POP mailbox update failed: %s", p.myhost);
|
|
p.CurrentState = error;
|
|
} else if (tgets(message, MAXLINELEN, p.input, pop_timeout) == NULL) {
|
|
pop_msg(&p, POP_FAILURE, "POP timeout: %s", p.myhost);
|
|
if (p.CurrentState > auth2 && !pop_updt(&p))
|
|
pop_msg(&p,POP_FAILURE,
|
|
"POP mailbox update failed: %s", p.myhost);
|
|
p.CurrentState = error;
|
|
}
|
|
else {
|
|
/* Search for the command in the command/state table */
|
|
if ((s = pop_get_command(&p,message)) == NULL) continue;
|
|
|
|
/* Call the function associated with this command in
|
|
the current state */
|
|
if (s->function) p.CurrentState = s->result[(*s->function)(&p)];
|
|
|
|
/* Otherwise assume NOOP and send an OK message to the client */
|
|
else {
|
|
p.CurrentState = s->success_state;
|
|
pop_msg(&p,POP_SUCCESS,NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Say goodbye to the client */
|
|
pop_msg(&p,POP_SUCCESS,"Pop server at %s signing off.",p.myhost);
|
|
|
|
/* Log the end of activity */
|
|
pop_log(&p,POP_PRIORITY,
|
|
"(v%s) Ending request from \"%s\" at %s\n",VERSION,p.client,p.ipaddr);
|
|
|
|
/* Stop logging */
|
|
closelog();
|
|
|
|
return(0);
|
|
}
|