NetBSD/libexec/uucpd/uucpd.c

310 lines
7.5 KiB
C

/* $NetBSD: uucpd.c,v 1.7 1997/10/13 09:28:11 lukem Exp $ */
/*
* Copyright (c) 1985 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Adams.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1985 The Regents of the University of California.\n\
All rights reserved.\n");
#if 0
static char sccsid[] = "from: @(#)uucpd.c 5.10 (Berkeley) 2/26/91";
#else
__RCSID("$NetBSD: uucpd.c,v 1.7 1997/10/13 09:28:11 lukem Exp $");
#endif
#endif /* not lint */
/*
* 4.2BSD TCP/IP server for uucico
* uucico's TCP channel causes this server to be run at the remote end.
*/
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <signal.h>
#include <fcntl.h>
#include <time.h>
#include <pwd.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <utmp.h>
#include <fcntl.h>
#include "pathnames.h"
struct sockaddr_in hisctladdr;
int hisaddrlen = sizeof hisctladdr;
struct sockaddr_in myctladdr;
int mypid;
char Username[64];
char *nenv[] = {
Username,
NULL,
};
extern char **environ;
void dologout __P((void));
void dologin __P((struct passwd *, struct sockaddr_in *));
void doit __P((struct sockaddr_in *));
int readline __P((char *, int));
int main __P((int, char **));
int
main(argc, argv)
int argc;
char **argv;
{
#ifndef BSDINETD
register int s, tcp_socket;
struct servent *sp;
#endif /* !BSDINETD */
extern int errno;
environ = nenv;
#ifdef BSDINETD
close(1); close(2);
dup(0); dup(0);
hisaddrlen = sizeof (hisctladdr);
if (getpeername(0, (struct sockaddr *)&hisctladdr, &hisaddrlen) < 0) {
fprintf(stderr, "%s: ", argv[0]);
perror("getpeername");
_exit(1);
}
if (fork() == 0)
doit(&hisctladdr);
dologout();
exit(1);
#else /* !BSDINETD */
sp = getservbyname("uucp", "tcp");
if (sp == NULL){
perror("uucpd: getservbyname");
exit(1);
}
if (fork())
exit(0);
if ((s=open(_PATH_TTY, 2)) >= 0){
ioctl(s, TIOCNOTTY, (char *)0);
close(s);
}
bzero((char *)&myctladdr, sizeof (myctladdr));
myctladdr.sin_len = sizeof(struct sockaddr_in);
myctladdr.sin_family = AF_INET;
myctladdr.sin_port = sp->s_port;
tcp_socket = socket(AF_INET, SOCK_STREAM, 0);
if (tcp_socket < 0) {
perror("uucpd: socket");
exit(1);
}
if (bind(tcp_socket, (char *)&myctladdr, sizeof (myctladdr)) < 0) {
perror("uucpd: bind");
exit(1);
}
listen(tcp_socket, 3); /* at most 3 simultaneuos uucp connections */
signal(SIGCHLD, dologout);
for(;;) {
s = accept(tcp_socket, &hisctladdr, &hisaddrlen);
if (s < 0){
if (errno == EINTR)
continue;
perror("uucpd: accept");
exit(1);
}
if (fork() == 0) {
close(0); close(1); close(2);
dup(s); dup(s); dup(s);
close(tcp_socket); close(s);
doit(&hisctladdr);
exit(1);
}
close(s);
}
#endif /* !BSDINETD */
}
void
doit(sinp)
struct sockaddr_in *sinp;
{
char user[64], passwd[64];
char *xpasswd;
struct passwd *pw;
alarm(60);
printf("login: "); fflush(stdout);
if (readline(user, sizeof user) < 0) {
fprintf(stderr, "user read\n");
return;
}
/* truncate username to 8 characters */
user[8] = '\0';
pw = getpwnam(user);
if (pw == NULL) {
fprintf(stderr, "user unknown\n");
return;
}
if (strcmp(pw->pw_shell, _PATH_UUCICO)) {
fprintf(stderr, "Login incorrect.");
return;
}
if (pw->pw_passwd && *pw->pw_passwd != '\0') {
printf("Password: "); fflush(stdout);
if (readline(passwd, sizeof passwd) < 0) {
fprintf(stderr, "passwd read\n");
return;
}
xpasswd = crypt(passwd, pw->pw_passwd);
if (strcmp(xpasswd, pw->pw_passwd)) {
fprintf(stderr, "Login incorrect.");
return;
}
}
alarm(0);
sprintf(Username, "USER=%s", user);
dologin(pw, sinp);
setgid(pw->pw_gid);
initgroups(pw->pw_name, pw->pw_gid);
chdir(pw->pw_dir);
setlogin(user);
setuid(pw->pw_uid);
execl(_PATH_UUCICO, "uucico", (char *)0);
perror("uucico server: execl");
}
int
readline(p, n)
char *p;
int n;
{
char c;
while (n-- > 0) {
if (read(0, &c, 1) <= 0)
return(-1);
c &= 0177;
if (c == '\r') {
*p = '\0';
return(0);
}
if (c != '\n')
*p++ = c;
}
return(-1);
}
#define SCPYN(a, b) strncpy(a, b, sizeof (a))
struct utmp utmp;
void
dologout()
{
union wait status;
int pid, wtmp;
#ifdef BSDINETD
while ((pid=wait((int *)&status)) > 0) {
#else /* !BSDINETD */
while ((pid=wait3((int *)&status,WNOHANG,0)) > 0) {
#endif /* !BSDINETD */
wtmp = open(_PATH_WTMP, O_WRONLY|O_APPEND);
if (wtmp >= 0) {
sprintf(utmp.ut_line, "uucp%.4d", pid);
SCPYN(utmp.ut_name, "");
SCPYN(utmp.ut_host, "");
(void) time(&utmp.ut_time);
(void) write(wtmp, (char *)&utmp, sizeof (utmp));
(void) close(wtmp);
}
}
}
/*
* Record login in wtmp file.
*/
void
dologin(pw, sin)
struct passwd *pw;
struct sockaddr_in *sin;
{
char line[32];
char remotehost[32];
int wtmp, f;
struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr,
sizeof (struct in_addr), AF_INET);
if (hp) {
strncpy(remotehost, hp->h_name, sizeof (remotehost));
endhostent();
} else
strncpy(remotehost, inet_ntoa(sin->sin_addr),
sizeof (remotehost));
wtmp = open(_PATH_WTMP, O_WRONLY|O_APPEND);
if (wtmp >= 0) {
/* hack, but must be unique and no tty line */
sprintf(line, "uucp%.4d", getpid());
SCPYN(utmp.ut_line, line);
SCPYN(utmp.ut_name, pw->pw_name);
SCPYN(utmp.ut_host, remotehost);
time(&utmp.ut_time);
(void) write(wtmp, (char *)&utmp, sizeof (utmp));
(void) close(wtmp);
}
if ((f = open(_PATH_LASTLOG, O_RDWR)) >= 0) {
struct lastlog ll;
time(&ll.ll_time);
lseek(f, pw->pw_uid * sizeof(struct lastlog), 0);
strcpy(line, remotehost);
SCPYN(ll.ll_line, line);
SCPYN(ll.ll_host, remotehost);
(void) write(f, (char *) &ll, sizeof ll);
(void) close(f);
}
}