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- /*
- * Copyright (c) 1985, 1993
- * 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.
- */
-
- #ifndef lint
- static char copyright[] =
- "@(#) Copyright (c) 1985, 1993\n\
- The Regents of the University of California. All rights reserved.\n";
- #endif /* not lint */
-
- #ifndef lint
- static char sccsid[] = "@(#)uucpd.c 8.1 (Berkeley) 6/4/93";
- #endif /* not lint */
-
- /*
- * 4.2BSD TCP/IP server for uucico
- * uucico's TCP channel causes this server to be run at the remote end.
- */
-
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
-
- #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 <paths.h>
- #include <crypt.h>
-
- void dologin ();
-
- struct sockaddr_in hisctladdr;
- int hisaddrlen = sizeof hisctladdr;
- struct sockaddr_in myctladdr;
- int mypid;
-
- char Username[64];
- char *nenv[] = {
- Username,
- NULL,
- };
- extern char **environ;
-
- main(argc, argv)
- int argc;
- char **argv;
- {
- #ifndef BSDINETD
- register int s, tcp_socket;
- struct servent *sp;
- #endif !BSDINETD
- extern int errno;
- int dologout();
-
- environ = nenv;
- #ifdef BSDINETD
- close(1); close(2);
- dup(0); dup(0);
- hisaddrlen = sizeof (hisctladdr);
- if (getpeername(0, &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_family = AF_INET;
- myctladdr.sin_port = sp->s_port;
- #ifdef BSD4_2
- 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 BSD4_2
-
- #endif !BSDINETD
- }
-
- void
- doit (sinp)
- struct sockaddr_in *sinp;
- {
- struct passwd *pw, *getpwnam();
- char user[64], passwd[64];
- char *xpasswd;
-
- 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);
- #ifdef BSD4_2
- initgroups(pw->pw_name, pw->pw_gid);
- #endif BSD4_2
- chdir(pw->pw_dir);
- setuid(pw->pw_uid);
- #ifdef BSD4_2
- execl(UUCICO, "uucico", (char *)0);
- #endif BSD4_2
- perror("uucico server: execl");
- }
-
- readline(p, n)
- register char *p;
- register int n;
- {
- char c;
-
- while (n-- > 0) {
- if (read(0, &c, 1) <= 0)
- return(-1);
- c &= 0177;
- if (c == '\n' || c == '\r') {
- *p = '\0';
- return(0);
- }
- *p++ = c;
- }
- return(-1);
- }
-
- #include <utmp.h>
- #ifdef BSD4_2
- #include <fcntl.h>
- #endif BSD4_2
-
- #define SCPYN(a, b) strncpy(a, b, sizeof (a))
-
- struct utmp utmp;
-
- dologout()
- {
- union wait status;
- int pid;
-
- #ifdef BSDINETD
- while ((pid=wait((int *)&status)) > 0) {
- #else !BSDINETD
- while ((pid=wait3((int *)&status,WNOHANG,0)) > 0) {
- #endif !BSDINETD
-
- #ifdef HAVE_LOGWTMP
- char line[100];
- sprintf(line, "uucp%.4d", pid);
- logwtmp (line, "", "");
- #else
- int wtmp = open(_PATH_WTMP, O_WRONLY|O_APPEND);
- if (wtmp >= 0) {
- SCPYN(utmp.ut_name, "");
- SCPYN(utmp.ut_host, "");
- (void) time(&utmp.ut_time);
- (void) write(wtmp, (char *)&utmp, sizeof (utmp));
- (void) close(wtmp);
- }
- #endif
- }
- }
-
- /*
- * 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));
-
- sprintf(line, "uucp%.4d", getpid());
-
- #ifdef HAVE_LOGWTMP
- logwtmp (line, pw->pw_name, remotehost);
- #else
- /* Do things the old bsd way. */
- wtmp = open(_PATH_WTMP, O_WRONLY|O_APPEND);
- if (wtmp >= 0) {
- /* hack, but must be unique and no tty line */
- 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);
- }
- #endif
-
- #ifdef _PATH_LASTLOG
- if ((f = open(_PATH_LASTLOG, O_RDWR)) >= 0) {
- struct lastlog ll;
-
- time(&ll.ll_time);
- lseek(f, (long)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);
- }
- #endif
- }
-