[unix-history] / usr / src / libexec / uucpd / uucpd.c

#ifndef lint
static char sccsid[] = "@(#)uucpd.c	5.4 (Berkeley) %G%";
#endif

/*
 * 4.2BSD or 2.9BSD TCP/IP server for uucico
 * uucico's TCP channel causes this server to be run at the remote end.
 */

#include "uucp.h"
#include <netdb.h>
#ifdef BSD2_9
#include <sys/localopts.h>
#include <sys/file.h>
#endif BSD2_9
#include <signal.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <pwd.h>
#include <lastlog.h>

#if !defined(BSD4_2) && !defined(BSD2_9)
--- You must have either BSD4_2 or BSD2_9 defined for this to work
#endif !BSD4_2 && !BSD2_9
#if defined(BSD4_2) && defined(BSD2_9)
--- You may not have both BSD4_2 and BSD2_9 defined for this to work
#endif	/* check for stupidity */

char lastlog[] = "/usr/adm/lastlog";
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("/dev/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

#ifdef BSD2_9
	for(;;) {
		signal(SIGCHLD, dologout);
		s = socket(SOCK_STREAM, 0,  &myctladdr,
			SO_ACCEPTCONN|SO_KEEPALIVE);
		if (s < 0) {
			perror("uucpd: socket");
			exit(1);
		}
		if (accept(s, &hisctladdr) < 0) {
			if (errno == EINTR) {
				close(s);
				continue;
			}
			perror("uucpd: accept");
			exit(1);
		}
		if (fork() == 0) {
			close(0); close(1); close(2);
			dup(s); dup(s); dup(s);
			close(s);
			doit(&hisctladdr);
			exit(1);
		}
	}
#endif BSD2_9
#endif	!BSDINETD
}

doit(sinp)
struct sockaddr_in *sinp;
{
	char user[64], passwd[64];
	char *xpasswd, *crypt();
	struct passwd *pw, *getpwnam();

	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, 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
#ifdef BSD2_9
	sprintf(passwd, "-h%s", inet_ntoa(sinp->sin_addr));
	execl(UUCICO, "uucico", passwd, (char *)0);
#endif BSD2_9
	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

#ifdef BSD2_9
#define O_APPEND	0 /* kludge */
#define wait3(a,b,c)	wait2(a,b)
#endif BSD2_9

#define	SCPYN(a, b)	strncpy(a, b, sizeof (a))

struct	utmp utmp;

dologout()
{
	union wait status;
	int pid, wtmp;

#ifdef BSDINETD
	while ((pid=wait(&status)) > 0) {
#else  !BSDINETD
	while ((pid=wait3(&status,WNOHANG,0)) > 0) {
#endif !BSDINETD
		wtmp = open("/usr/adm/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);
#ifdef BSD2_9
			(void) lseek(wtmp, 0L, 2);
#endif BSD2_9
			(void) write(wtmp, (char *)&utmp, sizeof (utmp));
			(void) close(wtmp);
		}
	}
}

/*
 * Record login in wtmp file.
 */
dologin(pw, sin)
struct passwd *pw;
struct sockaddr_in *sin;
{
	char line[32];
	char remotehost[32];
	int wtmp, f;
	struct hostent *hp = gethostbyaddr(&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("/usr/adm/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);
#ifdef BSD2_9
		(void) lseek(wtmp, 0L, 2);
#endif BSD2_9
		(void) write(wtmp, (char *)&utmp, sizeof (utmp));
		(void) close(wtmp);
	}
	if ((f = open(lastlog, 2)) >= 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);
	}
}
Commit	Line	Data
cd56d176	1	#ifndef lint
79b62878	2	static char sccsid[] = "@(#)uucpd.c 5.4 (Berkeley) %G%";
cd56d176 RC	3	#endif
	4
	5	/*
79b62878	6	* 4.2BSD or 2.9BSD TCP/IP server for uucico
46b15d8a	7	* uucico's TCP channel causes this server to be run at the remote end.
cd56d176 RC	8	*/
cd56d176 RC	9
46b15d8a	10	#include "uucp.h"
79b62878 JB	11	#include <netdb.h>
	12	#ifdef BSD2_9
	13	#include <sys/localopts.h>
	14	#include <sys/file.h>
	15	#endif BSD2_9
46b15d8a	16	#include <signal.h>
cd56d176	17	#include <errno.h>
cd56d176 RC	18	#include <sys/socket.h>
cd56d176 RC	19	#include <netinet/in.h>
46b15d8a	20	#include <sys/wait.h>
79b62878	21	#include <sys/ioctl.h>
46b15d8a RC	22	#include <pwd.h>
46b15d8a RC	23	#include <lastlog.h>
cd56d176	24
79b62878 JB	25	#if !defined(BSD4_2) && !defined(BSD2_9)
	26	--- You must have either BSD4_2 or BSD2_9 defined for this to work
	27	#endif !BSD4_2 && !BSD2_9
	28	#if defined(BSD4_2) && defined(BSD2_9)
	29	--- You may not have both BSD4_2 and BSD2_9 defined for this to work
	30	#endif /* check for stupidity */
	31
46b15d8a RC	32	char lastlog[] = "/usr/adm/lastlog";
	33	struct sockaddr_in hisctladdr;
	34	int hisaddrlen = sizeof hisctladdr;
	35	struct sockaddr_in myctladdr;
	36	int mypid;
cd56d176	37
79b62878 JB	38	char Username[64];
	39	char *nenv[] = {
	40	Username,
	41	NULL,
	42	};
	43	extern char **environ;
	44
cd56d176	45	main(argc, argv)
46b15d8a RC	46	int argc;
46b15d8a RC	47	char **argv;
cd56d176	48	{
1a85e9d2	49	#ifndef BSDINETD
46b15d8a RC	50	register int s, tcp_socket;
46b15d8a RC	51	struct servent *sp;
1a85e9d2	52	#endif !BSDINETD
46b15d8a RC	53	extern int errno;
46b15d8a RC	54	int dologout();
cd56d176	55
79b62878	56	environ = nenv;
46b15d8a RC	57	#ifdef BSDINETD
	58	close(1); close(2);
	59	dup(0); dup(0);
	60	hisaddrlen = sizeof (hisctladdr);
	61	if (getpeername(0, &hisctladdr, &hisaddrlen) < 0) {
cd56d176 RC	62	fprintf(stderr, "%s: ", argv[0]);
	63	perror("getpeername");
	64	_exit(1);
	65	}
46b15d8a RC	66	if (fork() == 0)
	67	doit(&hisctladdr);
	68	dologout();
cd56d176	69	exit(1);
46b15d8a RC	70	#else !BSDINETD
	71	sp = getservbyname("uucp", "tcp");
	72	if (sp == NULL){
	73	perror("uucpd: getservbyname");
	74	exit(1);
	75	}
79b62878 JB	76	if (fork())
79b62878 JB	77	exit(0);
46b15d8a RC	78	if ((s=open("/dev/tty", 2)) >= 0){
	79	ioctl(s, TIOCNOTTY, (char *)0);
	80	close(s);
	81	}
	82
	83	bzero((char *)&myctladdr, sizeof (myctladdr));
79b62878 JB	84	myctladdr.sin_family = AF_INET;
	85	myctladdr.sin_port = sp->s_port;
	86	#ifdef BSD4_2
	87	tcp_socket = socket(AF_INET, SOCK_STREAM, 0);
	88	if (tcp_socket < 0) {
46b15d8a RC	89	perror("uucpd: socket");
	90	exit(1);
	91	}
79b62878	92	if (bind(tcp_socket, (char *)&myctladdr, sizeof (myctladdr)) < 0) {
46b15d8a RC	93	perror("uucpd: bind");
	94	exit(1);
	95	}
79b62878	96	listen(tcp_socket, 3); /* at most 3 simultaneuos uucp connections */
46b15d8a	97	signal(SIGCHLD, dologout);
46b15d8a RC	98
	99	for(;;) {
	100	s = accept(tcp_socket, &hisctladdr, &hisaddrlen);
	101	if (s < 0){
79b62878	102	if (errno == EINTR)
46b15d8a RC	103	continue;
	104	perror("uucpd: accept");
	105	exit(1);
	106	}
79b62878	107	if (fork() == 0) {
46b15d8a RC	108	close(0); close(1); close(2);
46b15d8a RC	109	dup(s); dup(s); dup(s);
79b62878	110	close(tcp_socket); close(s);
46b15d8a RC	111	doit(&hisctladdr);
	112	exit(1);
	113	}
	114	close(s);
	115	}
79b62878 JB	116	#endif BSD4_2
	117
	118	#ifdef BSD2_9
	119	for(;;) {
	120	signal(SIGCHLD, dologout);
	121	s = socket(SOCK_STREAM, 0, &myctladdr,
	122	SO_ACCEPTCONN\|SO_KEEPALIVE);
	123	if (s < 0) {
	124	perror("uucpd: socket");
	125	exit(1);
	126	}
	127	if (accept(s, &hisctladdr) < 0) {
	128	if (errno == EINTR) {
	129	close(s);
	130	continue;
	131	}
	132	perror("uucpd: accept");
	133	exit(1);
	134	}
	135	if (fork() == 0) {
	136	close(0); close(1); close(2);
	137	dup(s); dup(s); dup(s);
	138	close(s);
	139	doit(&hisctladdr);
	140	exit(1);
	141	}
	142	}
	143	#endif BSD2_9
	144	#endif !BSDINETD
46b15d8a RC	145	}
	146
	147	doit(sinp)
	148	struct sockaddr_in *sinp;
	149	{
79b62878	150	char user[64], passwd[64];
46b15d8a RC	151	char xpasswd, crypt();
	152	struct passwd pw, getpwnam();
	153
	154	alarm(60);
1a85e9d2	155	printf("login: "); fflush(stdout);
46b15d8a RC	156	if (readline(user, sizeof user) < 0) {
	157	fprintf(stderr, "user read\n");
	158	return;
	159	}
	160	/* truncate username to 8 characters */
	161	user[8] = '\0';
	162	pw = getpwnam(user);
	163	if (pw == NULL) {
	164	fprintf(stderr, "user unknown\n");
	165	return;
	166	}
	167	if (strcmp(pw->pw_shell, UUCICO)) {
	168	fprintf(stderr, "Login incorrect.");
	169	return;
	170	}
	171	if (pw->pw_passwd && *pw->pw_passwd != '\0') {
1a85e9d2	172	printf("Password: "); fflush(stdout);
46b15d8a RC	173	if (readline(passwd, sizeof passwd) < 0) {
	174	fprintf(stderr, "passwd read\n");
	175	return;
	176	}
	177	xpasswd = crypt(passwd, pw->pw_passwd);
	178	if (strcmp(xpasswd, pw->pw_passwd)) {
	179	fprintf(stderr, "Login incorrect.");
	180	return;
	181	}
	182	}
	183	alarm(0);
79b62878	184	sprintf(Username, "USER=%s", user);
46b15d8a	185	dologin(pw, sinp);
79b62878 JB	186	setgid(pw->pw_gid);
79b62878 JB	187	#ifdef BSD4_2
46b15d8a	188	initgroups(pw->pw_name, pw->pw_gid);
79b62878	189	#endif BSD4_2
46b15d8a	190	chdir(pw->pw_dir);
79b62878 JB	191	setuid(pw->pw_uid);
79b62878 JB	192	#ifdef BSD4_2
46b15d8a	193	execl(UUCICO, "uucico", (char *)0);
79b62878 JB	194	#endif BSD4_2
	195	#ifdef BSD2_9
	196	sprintf(passwd, "-h%s", inet_ntoa(sinp->sin_addr));
	197	execl(UUCICO, "uucico", passwd, (char *)0);
	198	#endif BSD2_9
46b15d8a RC	199	perror("uucico server: execl");
	200	}
	201
	202	readline(p, n)
1a85e9d2 RC	203	register char *p;
1a85e9d2 RC	204	register int n;
46b15d8a RC	205	{
	206	char c;
	207
	208	while (n-- > 0) {
	209	if (read(0, &c, 1) <= 0)
	210	return(-1);
	211	c &= 0177;
	212	if (c == '\n' \|\| c == '\r') {
	213	*p = '\0';
	214	return(0);
	215	}
	216	*p++ = c;
	217	}
	218	return(-1);
	219	}
	220
	221	#include <utmp.h>
79b62878	222	#ifdef BSD4_2
46b15d8a	223	#include <fcntl.h>
79b62878 JB	224	#endif BSD4_2
	225
	226	#ifdef BSD2_9
	227	#define O_APPEND 0 /* kludge */
	228	#define wait3(a,b,c) wait2(a,b)
	229	#endif BSD2_9
46b15d8a RC	230
	231	#define SCPYN(a, b) strncpy(a, b, sizeof (a))
	232
	233	struct utmp utmp;
	234
	235	dologout()
	236	{
	237	union wait status;
	238	int pid, wtmp;
	239
	240	#ifdef BSDINETD
79b62878	241	while ((pid=wait(&status)) > 0) {
46b15d8a	242	#else !BSDINETD
79b62878	243	while ((pid=wait3(&status,WNOHANG,0)) > 0) {
46b15d8a RC	244	#endif !BSDINETD
	245	wtmp = open("/usr/adm/wtmp", O_WRONLY\|O_APPEND);
	246	if (wtmp >= 0) {
	247	sprintf(utmp.ut_line, "uucp%.4d", pid);
	248	SCPYN(utmp.ut_name, "");
	249	SCPYN(utmp.ut_host, "");
79b62878 JB	250	(void) time(&utmp.ut_time);
	251	#ifdef BSD2_9
	252	(void) lseek(wtmp, 0L, 2);
	253	#endif BSD2_9
46b15d8a RC	254	(void) write(wtmp, (char *)&utmp, sizeof (utmp));
	255	(void) close(wtmp);
	256	}
	257	}
	258	}
	259
	260	/*
	261	* Record login in wtmp file.
	262	*/
	263	dologin(pw, sin)
	264	struct passwd *pw;
	265	struct sockaddr_in *sin;
	266	{
	267	char line[32];
	268	char remotehost[32];
	269	int wtmp, f;
	270	struct hostent *hp = gethostbyaddr(&sin->sin_addr,
	271	sizeof (struct in_addr), AF_INET);
	272
	273	if (hp) {
	274	strncpy(remotehost, hp->h_name, sizeof (remotehost));
	275	endhostent();
	276	} else
	277	strncpy(remotehost, inet_ntoa(sin->sin_addr),
	278	sizeof (remotehost));
	279	wtmp = open("/usr/adm/wtmp", O_WRONLY\|O_APPEND);
	280	if (wtmp >= 0) {
	281	/* hack, but must be unique and no tty line */
	282	sprintf(line, "uucp%.4d", getpid());
	283	SCPYN(utmp.ut_line, line);
	284	SCPYN(utmp.ut_name, pw->pw_name);
	285	SCPYN(utmp.ut_host, remotehost);
79b62878 JB	286	time(&utmp.ut_time);
	287	#ifdef BSD2_9
	288	(void) lseek(wtmp, 0L, 2);
	289	#endif BSD2_9
46b15d8a RC	290	(void) write(wtmp, (char *)&utmp, sizeof (utmp));
	291	(void) close(wtmp);
	292	}
	293	if ((f = open(lastlog, 2)) >= 0) {
	294	struct lastlog ll;
	295
	296	time(&ll.ll_time);
	297	lseek(f, (long)pw->pw_uid * sizeof(struct lastlog), 0);
	298	strcpy(line, remotehost);
	299	SCPYN(ll.ll_line, line);
	300	SCPYN(ll.ll_host, remotehost);
	301	(void) write(f, (char *) &ll, sizeof ll);
	302	(void) close(f);
	303	}
cd56d176	304	}