115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
/*
|
|
* Copyright (c) 1983 Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms are permitted
|
|
* provided that: (1) source distributions retain this entire copyright
|
|
* notice and comment, and (2) distributions including binaries display
|
|
* the following acknowledgement: ``This product includes software
|
|
* developed by the University of California, Berkeley and its contributors''
|
|
* in the documentation or other materials provided with the distribution
|
|
* and in all advertising materials mentioning features or use of this
|
|
* software. Neither the name of the University nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)get_names.c 5.8 (Berkeley) 6/1/90";
|
|
#endif /* not lint */
|
|
|
|
#include "talk.h"
|
|
#include <sys/param.h>
|
|
#include <protocols/talkd.h>
|
|
#include <pwd.h>
|
|
|
|
char *getlogin();
|
|
char *ttyname();
|
|
char *rindex();
|
|
extern CTL_MSG msg;
|
|
|
|
/*
|
|
* Determine the local and remote user, tty, and machines
|
|
*/
|
|
get_names(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
char hostname[MAXHOSTNAMELEN];
|
|
char *his_name, *my_name;
|
|
char *my_machine_name, *his_machine_name;
|
|
char *my_tty, *his_tty;
|
|
register char *cp;
|
|
|
|
if (argc < 2 ) {
|
|
printf("Usage: talk user [ttyname]\n");
|
|
exit(-1);
|
|
}
|
|
if (!isatty(0)) {
|
|
printf("Standard input must be a tty, not a pipe or a file\n");
|
|
exit(-1);
|
|
}
|
|
if ((my_name = getlogin()) == NULL) {
|
|
struct passwd *pw;
|
|
|
|
if ((pw = getpwuid(getuid())) == NULL) {
|
|
printf("You don't exist. Go away.\n");
|
|
exit(-1);
|
|
}
|
|
my_name = pw->pw_name;
|
|
}
|
|
gethostname(hostname, sizeof (hostname));
|
|
my_machine_name = hostname;
|
|
/* check for, and strip out, the machine name of the target */
|
|
for (cp = argv[1]; *cp && !any(*cp, "@:!."); cp++)
|
|
;
|
|
if (*cp == '\0') {
|
|
/* this is a local to local talk */
|
|
his_name = argv[1];
|
|
his_machine_name = my_machine_name;
|
|
} else {
|
|
if (*cp++ == '@') {
|
|
/* user@host */
|
|
his_name = argv[1];
|
|
his_machine_name = cp;
|
|
} else {
|
|
/* host.user or host!user or host:user */
|
|
his_name = cp;
|
|
his_machine_name = argv[1];
|
|
}
|
|
*--cp = '\0';
|
|
}
|
|
if (argc > 2)
|
|
his_tty = argv[2]; /* tty name is arg 2 */
|
|
else
|
|
his_tty = "";
|
|
get_addrs(my_machine_name, his_machine_name);
|
|
/*
|
|
* Initialize the message template.
|
|
*/
|
|
msg.vers = TALK_VERSION;
|
|
msg.addr.sa_family = htons(AF_INET);
|
|
msg.ctl_addr.sa_family = htons(AF_INET);
|
|
msg.id_num = htonl(0);
|
|
strncpy(msg.l_name, my_name, NAME_SIZE);
|
|
msg.l_name[NAME_SIZE - 1] = '\0';
|
|
strncpy(msg.r_name, his_name, NAME_SIZE);
|
|
msg.r_name[NAME_SIZE - 1] = '\0';
|
|
strncpy(msg.r_tty, his_tty, TTY_SIZE);
|
|
msg.r_tty[TTY_SIZE - 1] = '\0';
|
|
}
|
|
|
|
static
|
|
any(c, cp)
|
|
register char c, *cp;
|
|
{
|
|
|
|
while (*cp)
|
|
if (c == *cp++)
|
|
return (1);
|
|
return (0);
|
|
}
|