294 lines
7.3 KiB
C
294 lines
7.3 KiB
C
/*
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* Copyright (c) 1985 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Adams.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1985 The Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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/*static char sccsid[] = "from: @(#)uucpd.c 5.10 (Berkeley) 2/26/91";*/
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static char rcsid[] = "$Id: uucpd.c,v 1.4 1995/06/03 22:48:48 mycroft Exp $";
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#endif /* not lint */
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/*
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* 4.2BSD TCP/IP server for uucico
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* uucico's TCP channel causes this server to be run at the remote end.
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*/
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <time.h>
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#include <pwd.h>
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#include <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "pathnames.h"
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struct sockaddr_in hisctladdr;
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int hisaddrlen = sizeof hisctladdr;
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struct sockaddr_in myctladdr;
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int mypid;
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char Username[64];
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char *nenv[] = {
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Username,
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NULL,
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};
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extern char **environ;
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main(argc, argv)
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int argc;
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char **argv;
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{
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#ifndef BSDINETD
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register int s, tcp_socket;
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struct servent *sp;
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#endif /* !BSDINETD */
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extern int errno;
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int dologout();
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environ = nenv;
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#ifdef BSDINETD
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close(1); close(2);
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dup(0); dup(0);
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hisaddrlen = sizeof (hisctladdr);
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if (getpeername(0, (struct sockaddr *)&hisctladdr, &hisaddrlen) < 0) {
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fprintf(stderr, "%s: ", argv[0]);
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perror("getpeername");
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_exit(1);
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}
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if (fork() == 0)
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doit(&hisctladdr);
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dologout();
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exit(1);
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#else /* !BSDINETD */
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sp = getservbyname("uucp", "tcp");
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if (sp == NULL){
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perror("uucpd: getservbyname");
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exit(1);
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}
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if (fork())
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exit(0);
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if ((s=open(_PATH_TTY, 2)) >= 0){
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ioctl(s, TIOCNOTTY, (char *)0);
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close(s);
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}
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bzero((char *)&myctladdr, sizeof (myctladdr));
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myctladdr.sin_len = sizeof(struct sockaddr_in);
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myctladdr.sin_family = AF_INET;
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myctladdr.sin_port = sp->s_port;
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tcp_socket = socket(AF_INET, SOCK_STREAM, 0);
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if (tcp_socket < 0) {
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perror("uucpd: socket");
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exit(1);
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}
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if (bind(tcp_socket, (char *)&myctladdr, sizeof (myctladdr)) < 0) {
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perror("uucpd: bind");
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exit(1);
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}
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listen(tcp_socket, 3); /* at most 3 simultaneuos uucp connections */
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signal(SIGCHLD, dologout);
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for(;;) {
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s = accept(tcp_socket, &hisctladdr, &hisaddrlen);
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if (s < 0){
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if (errno == EINTR)
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continue;
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perror("uucpd: accept");
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exit(1);
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}
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if (fork() == 0) {
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close(0); close(1); close(2);
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dup(s); dup(s); dup(s);
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close(tcp_socket); close(s);
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doit(&hisctladdr);
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exit(1);
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}
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close(s);
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}
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#endif /* !BSDINETD */
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}
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doit(sinp)
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struct sockaddr_in *sinp;
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{
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char user[64], passwd[64];
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char *xpasswd, *crypt();
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struct passwd *pw, *getpwnam();
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alarm(60);
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printf("login: "); fflush(stdout);
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if (readline(user, sizeof user) < 0) {
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fprintf(stderr, "user read\n");
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return;
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}
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/* truncate username to 8 characters */
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user[8] = '\0';
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pw = getpwnam(user);
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if (pw == NULL) {
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fprintf(stderr, "user unknown\n");
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return;
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}
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if (strcmp(pw->pw_shell, _PATH_UUCICO)) {
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fprintf(stderr, "Login incorrect.");
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return;
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}
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if (pw->pw_passwd && *pw->pw_passwd != '\0') {
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printf("Password: "); fflush(stdout);
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if (readline(passwd, sizeof passwd) < 0) {
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fprintf(stderr, "passwd read\n");
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return;
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}
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xpasswd = crypt(passwd, pw->pw_passwd);
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if (strcmp(xpasswd, pw->pw_passwd)) {
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fprintf(stderr, "Login incorrect.");
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return;
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}
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}
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alarm(0);
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sprintf(Username, "USER=%s", user);
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dologin(pw, sinp);
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setgid(pw->pw_gid);
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initgroups(pw->pw_name, pw->pw_gid);
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chdir(pw->pw_dir);
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setuid(pw->pw_uid);
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execl(_PATH_UUCICO, "uucico", (char *)0);
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perror("uucico server: execl");
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}
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readline(p, n)
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register char *p;
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register int n;
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{
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char c;
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while (n-- > 0) {
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if (read(0, &c, 1) <= 0)
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return(-1);
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c &= 0177;
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if (c == '\n' || c == '\r') {
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*p = '\0';
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return(0);
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}
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*p++ = c;
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}
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return(-1);
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}
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#include <utmp.h>
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#include <fcntl.h>
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#define SCPYN(a, b) strncpy(a, b, sizeof (a))
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struct utmp utmp;
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dologout()
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{
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union wait status;
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int pid, wtmp;
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#ifdef BSDINETD
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while ((pid=wait((int *)&status)) > 0) {
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#else /* !BSDINETD */
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while ((pid=wait3((int *)&status,WNOHANG,0)) > 0) {
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#endif /* !BSDINETD */
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wtmp = open(_PATH_WTMP, O_WRONLY|O_APPEND);
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if (wtmp >= 0) {
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sprintf(utmp.ut_line, "uucp%.4d", pid);
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SCPYN(utmp.ut_name, "");
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SCPYN(utmp.ut_host, "");
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(void) time(&utmp.ut_time);
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(void) write(wtmp, (char *)&utmp, sizeof (utmp));
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(void) close(wtmp);
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}
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}
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}
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/*
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* Record login in wtmp file.
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*/
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dologin(pw, sin)
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struct passwd *pw;
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struct sockaddr_in *sin;
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{
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char line[32];
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char remotehost[32];
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int wtmp, f;
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struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr,
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sizeof (struct in_addr), AF_INET);
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if (hp) {
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strncpy(remotehost, hp->h_name, sizeof (remotehost));
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endhostent();
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} else
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strncpy(remotehost, inet_ntoa(sin->sin_addr),
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sizeof (remotehost));
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wtmp = open(_PATH_WTMP, O_WRONLY|O_APPEND);
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if (wtmp >= 0) {
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/* hack, but must be unique and no tty line */
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sprintf(line, "uucp%.4d", getpid());
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SCPYN(utmp.ut_line, line);
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SCPYN(utmp.ut_name, pw->pw_name);
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SCPYN(utmp.ut_host, remotehost);
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time(&utmp.ut_time);
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(void) write(wtmp, (char *)&utmp, sizeof (utmp));
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(void) close(wtmp);
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}
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if ((f = open(_PATH_LASTLOG, O_RDWR)) >= 0) {
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struct lastlog ll;
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time(&ll.ll_time);
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lseek(f, pw->pw_uid * sizeof(struct lastlog), 0);
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strcpy(line, remotehost);
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SCPYN(ll.ll_line, line);
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SCPYN(ll.ll_host, remotehost);
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(void) write(f, (char *) &ll, sizeof ll);
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(void) close(f);
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}
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}
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