char *mylocalhost (void)
{
if (!myLocalHost) {
char tmp[MAILTMPLEN];
if (!wsa_initted++) { /* init Windows Sockets */
WSADATA wsock;
if (WSAStartup (WINSOCK_VERSION,&wsock)) {
wsa_initted = 0;
return "random-pc"; /* try again later? */
}
}
myLocalHost = cpystr ((gethostname (tmp,MAILTMPLEN-1) == SOCKET_ERROR) ?
"random-pc" : tcp_canonical (tmp));
}
return myLocalHost;
}
TCPSTREAM *tcp_aopen (NETMBX *mb,char *service,char *usrbuf)
{
TCPSTREAM *stream = NIL;
void *adr;
char host[MAILTMPLEN],tmp[MAILTMPLEN],*path,*argv[MAXARGV+1],*r;
int i,ti,pipei[2],pipeo[2];
size_t len;
time_t now;
struct timeval tmo;
fd_set fds,efds;
blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL);
#ifdef SSHPATH /* ssh path defined yet? */
if (!sshpath) sshpath = cpystr (SSHPATH);
#endif
#ifdef RSHPATH /* rsh path defined yet? */
if (!rshpath) rshpath = cpystr (RSHPATH);
#endif
if (*service == '*') { /* want ssh? */
/* return immediately if ssh disabled */
if (!(sshpath && (ti = sshtimeout))) return NIL;
/* ssh command prototype defined yet? */
if (!sshcommand) sshcommand = cpystr ("%s %s -l %s exec /etc/r%sd");
}
/* want rsh? */
else if (rshpath && (ti = rshtimeout)) {
/* rsh command prototype defined yet? */
if (!rshcommand) rshcommand = cpystr ("%s %s -l %s exec /etc/r%sd");
}
else return NIL; /* rsh disabled */
/* look like domain literal? */
if (mb->host[0] == '[' && mb->host[i = (strlen (mb->host))-1] == ']') {
strcpy (host,mb->host+1); /* yes, copy without brackets */
host[i-1] = '\0';
/* validate domain literal */
if (adr = ip_stringtoaddr (host,&len,&i)) fs_give ((void **) &adr);
else {
sprintf (tmp,"Bad format domain-literal: %.80s",host);
mm_log (tmp,ERROR);
return NIL;
}
}
else strcpy (host,tcp_canonical (mb->host));
if (*service == '*') /* build ssh command */
sprintf (tmp,sshcommand,sshpath,host,
mb->user[0] ? mb->user : myusername (),service + 1);
else sprintf (tmp,rshcommand,rshpath,host,
mb->user[0] ? mb->user : myusername (),service);
if (tcpdebug) {
char msg[MAILTMPLEN];
sprintf (msg,"Trying %.100s",tmp);
mm_log (msg,TCPDEBUG);
}
/* parse command into argv */
for (i = 1,path = argv[0] = strtok_r (tmp," ",&r);
(i < MAXARGV) && (argv[i] = strtok_r (NIL," ",&r)); i++);
argv[i] = NIL; /* make sure argv tied off */
/* make command pipes */
if (pipe (pipei) < 0) return NIL;
if ((pipei[0] >= FD_SETSIZE) || (pipei[1] >= FD_SETSIZE) ||
(pipe (pipeo) < 0)) {
close (pipei[0]); close (pipei[1]);
return NIL;
}
(*bn) (BLOCK_TCPOPEN,NIL); /* quell alarm up here for NeXT */
if ((pipeo[0] >= FD_SETSIZE) || (pipeo[1] >= FD_SETSIZE) ||
((i = fork ()) < 0)) { /* make inferior process */
close (pipei[0]); close (pipei[1]);
close (pipeo[0]); close (pipeo[1]);
(*bn) (BLOCK_NONE,NIL);
return NIL;
}
if (!i) { /* if child */
alarm (0); /* never have alarms in children */
if (!fork ()) { /* make grandchild so it's inherited by init */
int cf; /* don't alter parent vars in case vfork() */
int maxfd = max (20,max (max(pipei[0],pipei[1]),max(pipeo[0],pipeo[1])));
dup2 (pipei[1],1); /* parent's input is my output */
dup2 (pipei[1],2); /* parent's input is my error output too */
dup2 (pipeo[0],0); /* parent's output is my input */
/* close all unnecessary descriptors */
for (cf = 3; cf <= maxfd; cf++) close (cf);
setpgrp (0,getpid ()); /* be our own process group */
_exit (execv (path,argv));/* now run it */
}
_exit (1); /* child is done */
}
grim_pid_reap (i,NIL); /* reap child; grandchild now owned by init */
close (pipei[1]); /* close child's side of the pipes */
close (pipeo[0]);
/* create TCP/IP stream */
stream = (TCPSTREAM *) memset (fs_get (sizeof (TCPSTREAM)),0,
sizeof (TCPSTREAM));
/* copy remote host name from argument */
stream->remotehost = cpystr (stream->host = cpystr (host));
stream->tcpsi = pipei[0]; /* init sockets */
stream->tcpso = pipeo[1];
stream->ictr = 0; /* init input counter */
stream->port = 0xffffffff; /* no port number */
ti += now = time (0); /* open timeout */
tmo.tv_usec = 0; /* initialize usec timeout */
FD_ZERO (&fds); /* initialize selection vector */
FD_ZERO (&efds); /* handle errors too */
FD_SET (stream->tcpsi,&fds); /* set bit in selection vector */
FD_SET (stream->tcpsi,&efds); /* set bit in error selection vector */
FD_SET (stream->tcpso,&efds); /* set bit in error selection vector */
do { /* block under timeout */
tmo.tv_sec = ti - now;
i = select (max (stream->tcpsi,stream->tcpso)+1,&fds,NIL,&efds,&tmo);
now = time (0); /* fake timeout if interrupt & time expired */
if ((i < 0) && (errno == EINTR) && ti && (ti <= now)) i = 0;
} while ((i < 0) && (errno == EINTR));
if (i <= 0) { /* timeout or error? */
sprintf (tmp,i ? "error in %s to IMAP server" :
"%s to IMAP server timed out",(*service == '*') ? "ssh" : "rsh");
mm_log (tmp,WARN);
tcp_close (stream); /* punt stream */
stream = NIL;
}
(*bn) (BLOCK_NONE,NIL);
/* return user name */
strcpy (usrbuf,mb->user[0] ? mb->user : myusername ());
return stream; /* return success */
}