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

#ifndef lint
static char sccsid[] = "@(#)rexecd.c	4.11 (Berkeley) 84/04/11";
#endif

#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/wait.h>

#include <netinet/in.h>

#include <stdio.h>
#include <errno.h>
#include <pwd.h>
#include <signal.h>
#include <netdb.h>

extern	errno;
struct	sockaddr_in sin = { AF_INET };
struct	passwd *getpwnam();
char	*crypt(), *rindex(), *sprintf();
/* VARARGS 1 */
int	error();
int	reapchild();
/*
 * remote execute server:
 *	username\0
 *	password\0
 *	command\0
 *	data
 */
main(argc, argv)
	int argc;
	char **argv;
{
	int f;
	struct sockaddr_in from;
	struct servent *sp;

	sp = getservbyname("exec", "tcp");
	if (sp == 0) {
		fprintf(stderr, "tcp/exec: unknown service\n");
		exit(1);
	}
	sin.sin_port = sp->s_port;
#ifndef DEBUG
	if (fork())
		exit(0);
	for (f = 0; f < 10; f++)
		(void) close(f);
	(void) open("/", 0);
	(void) dup2(0, 1);
	(void) dup2(0, 2);
	{ int t = open("/dev/tty", 2);
	  if (t >= 0) {
		ioctl(t, TIOCNOTTY, (char *)0);
		(void) close(t);
	  }
	}
#endif
	argc--, argv++;
	f = socket(AF_INET, SOCK_STREAM, 0, 0);
	if (f < 0) {
		perror("rexecd: socket");
		exit(1);
	}
	if (bind(f, &sin, sizeof (sin), 0) < 0) {
		perror("rexecd: bind:");
		exit(1);
	}
	signal(SIGCHLD, reapchild);
	listen(f, 10);
	for (;;) {
		int s, len = sizeof (from);

		s = accept(f, &from, &len, 0);
		if (s < 0) {
			if (errno == EINTR)
				continue;
			perror("rexecd: accept");
			sleep(1);
			continue;
		}
		if (fork() == 0) {
			signal(SIGCHLD, SIG_IGN);
			doit(s, &from);
		}
		(void) close(s);
	}
}

reapchild()
{
	union wait status;

	while (wait3(&status, WNOHANG, 0) > 0)
		;
}

char	username[20] = "USER=";
char	homedir[64] = "HOME=";
char	shell[64] = "SHELL=";
char	*envinit[] =
	    {homedir, shell, "PATH=:/usr/ucb:/bin:/usr/bin", username, 0};
char	**environ;

struct	sockaddr_in asin = { AF_INET };

doit(f, fromp)
	int f;
	struct sockaddr_in *fromp;
{
	char cmdbuf[NCARGS+1], *cp, *namep;
	char user[16], pass[16];
	struct passwd *pwd;
	int s;
	short port;
	int pv[2], pid, ready, readfrom, cc;
	char buf[BUFSIZ], sig;
	int one = 1;

	(void) signal(SIGINT, SIG_DFL);
	(void) signal(SIGQUIT, SIG_DFL);
	(void) signal(SIGTERM, SIG_DFL);
#ifdef DEBUG
	{ int t = open("/dev/tty", 2);
	  if (t >= 0) {
		ioctl(t, TIOCNOTTY, (char *)0);
		(void) close(t);
	  }
	}
#endif
	dup2(f, 0);
	dup2(f, 1);
	dup2(f, 2);
	(void) alarm(60);
	port = 0;
	for (;;) {
		char c;
		if (read(f, &c, 1) != 1)
			exit(1);
		if (c == 0)
			break;
		port = port * 10 + c - '0';
	}
	(void) alarm(0);
	if (port != 0) {
		s = socket(AF_INET, SOCK_STREAM, 0, 0);
		if (s < 0)
			exit(1);
		if (bind(s, &asin, sizeof (asin), 0) < 0)
			exit(1);
		(void) alarm(60);
		fromp->sin_port = htons((u_short)port);
		if (connect(s, fromp, sizeof (*fromp), 0) < 0)
			exit(1);
		(void) alarm(0);
	}
	getstr(user, sizeof(user), "username");
	getstr(pass, sizeof(pass), "password");
	getstr(cmdbuf, sizeof(cmdbuf), "command");
	setpwent();
	pwd = getpwnam(user);
	if (pwd == NULL) {
		error("Login incorrect.\n");
		exit(1);
	}
	endpwent();
	if (*pwd->pw_passwd != '\0') {
		namep = crypt(pass, pwd->pw_passwd);
		if (strcmp(namep, pwd->pw_passwd)) {
			error("Password incorrect.\n");
			exit(1);
		}
	}
	if (chdir(pwd->pw_dir) < 0) {
		error("No remote directory.\n");
		exit(1);
	}
	(void) write(2, "\0", 1);
	if (port) {
		(void) pipe(pv);
		pid = fork();
		if (pid == -1)  {
			error("Try again.\n");
			exit(1);
		}
		if (pid) {
			(void) close(0); (void) close(1); (void) close(2);
			(void) close(f); (void) close(pv[1]);
			readfrom = (1<<s) | (1<<pv[0]);
			ioctl(pv[1], FIONBIO, (char *)&one);
			/* should set s nbio! */
			do {
				ready = readfrom;
				(void) select(16, &ready, 0, 0, 0);
				if (ready & (1<<s)) {
					if (read(s, &sig, 1) <= 0)
						readfrom &= ~(1<<s);
					else
						killpg(pid, sig);
				}
				if (ready & (1<<pv[0])) {
					cc = read(pv[0], buf, sizeof (buf));
					if (cc <= 0) {
						shutdown(s, 1+1);
						readfrom &= ~(1<<pv[0]);
					} else
						(void) write(s, buf, cc);
				}
			} while (readfrom);
			exit(0);
		}
		setpgrp(0, getpid());
		(void) close(s); (void)close(pv[0]);
		dup2(pv[1], 2);
	}
	if (*pwd->pw_shell == '\0')
		pwd->pw_shell = "/bin/sh";
	(void) close(f);
	initgroups(pwd->pw_name, pwd->pw_gid);
	(void) setuid(pwd->pw_uid);
	(void) setgid(pwd->pw_gid);
	environ = envinit;
	strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
	strncat(shell, pwd->pw_shell, sizeof(shell)-7);
	strncat(username, pwd->pw_name, sizeof(username)-6);
	cp = rindex(pwd->pw_shell, '/');
	if (cp)
		cp++;
	else
		cp = pwd->pw_shell;
	execl(pwd->pw_shell, cp, "-c", cmdbuf, 0);
	perror(pwd->pw_shell);
	exit(1);
}

/* VARARGS 1 */
error(fmt, a1, a2, a3)
	char *fmt;
	int a1, a2, a3;
{
	char buf[BUFSIZ];

	buf[0] = 1;
	(void) sprintf(buf+1, fmt, a1, a2, a3);
	(void) write(2, buf, strlen(buf));
}

getstr(buf, cnt, err)
	char *buf;
	int cnt;
	char *err;
{
	char c;

	do {
		if (read(0, &c, 1) != 1)
			exit(1);
		*buf++ = c;
		if (--cnt == 0) {
			error("%s too long\n", err);
			exit(1);
		}
	} while (c != 0);
}
Commit	Line	Data
f0d0adca	1	#ifndef lint
4d1bc57f	2	static char sccsid[] = "@(#)rexecd.c 4.11 (Berkeley) 84/04/11";
f0d0adca BJ	3	#endif
f0d0adca BJ	4
f0d0adca BJ	5	#include <sys/ioctl.h>
	6	#include <sys/param.h>
	7	#include <sys/socket.h>
ce4fd43b	8	#include <sys/wait.h>
94a2d2a7 SL	9
	10	#include <netinet/in.h>
	11
	12	#include <stdio.h>
f0d0adca BJ	13	#include <errno.h>
f0d0adca BJ	14	#include <pwd.h>
f0d0adca	15	#include <signal.h>
94a2d2a7	16	#include <netdb.h>
f0d0adca BJ	17
f0d0adca BJ	18	extern errno;
94a2d2a7	19	struct sockaddr_in sin = { AF_INET };
f0d0adca BJ	20	struct passwd *getpwnam();
f0d0adca BJ	21	char crypt(), rindex(), *sprintf();
f0d0adca BJ	22	/* VARARGS 1 */
f0d0adca BJ	23	int error();
10137a96	24	int reapchild();
f0d0adca BJ	25	/*
	26	* remote execute server:
	27	* username\0
	28	* password\0
	29	* command\0
	30	* data
	31	*/
	32	main(argc, argv)
	33	int argc;
	34	char **argv;
	35	{
f0d0adca BJ	36	int f;
f0d0adca BJ	37	struct sockaddr_in from;
94a2d2a7	38	struct servent *sp;
f0d0adca	39
94a2d2a7 SL	40	sp = getservbyname("exec", "tcp");
	41	if (sp == 0) {
	42	fprintf(stderr, "tcp/exec: unknown service\n");
	43	exit(1);
	44	}
5458e392	45	sin.sin_port = sp->s_port;
f0d0adca BJ	46	#ifndef DEBUG
	47	if (fork())
	48	exit(0);
	49	for (f = 0; f < 10; f++)
	50	(void) close(f);
	51	(void) open("/", 0);
	52	(void) dup2(0, 1);
	53	(void) dup2(0, 2);
	54	{ int t = open("/dev/tty", 2);
	55	if (t >= 0) {
	56	ioctl(t, TIOCNOTTY, (char *)0);
	57	(void) close(t);
	58	}
	59	}
f0d0adca BJ	60	#endif
f0d0adca BJ	61	argc--, argv++;
36a969c5	62	f = socket(AF_INET, SOCK_STREAM, 0, 0);
94a2d2a7 SL	63	if (f < 0) {
	64	perror("rexecd: socket");
	65	exit(1);
	66	}
	67	if (bind(f, &sin, sizeof (sin), 0) < 0) {
	68	perror("rexecd: bind:");
	69	exit(1);
	70	}
8daa86a6	71	signal(SIGCHLD, reapchild);
94a2d2a7	72	listen(f, 10);
f0d0adca	73	for (;;) {
94a2d2a7 SL	74	int s, len = sizeof (from);
	75
	76	s = accept(f, &from, &len, 0);
	77	if (s < 0) {
10137a96 SL	78	if (errno == EINTR)
10137a96 SL	79	continue;
94a2d2a7	80	perror("rexecd: accept");
f0d0adca BJ	81	sleep(1);
	82	continue;
	83	}
d05f347d SL	84	if (fork() == 0) {
d05f347d SL	85	signal(SIGCHLD, SIG_IGN);
94a2d2a7	86	doit(s, &from);
d05f347d	87	}
94a2d2a7	88	(void) close(s);
f0d0adca BJ	89	}
	90	}
	91
10137a96 SL	92	reapchild()
	93	{
	94	union wait status;
	95
	96	while (wait3(&status, WNOHANG, 0) > 0)
	97	;
	98	}
	99
f0d0adca BJ	100	char username[20] = "USER=";
	101	char homedir[64] = "HOME=";
	102	char shell[64] = "SHELL=";
	103	char *envinit[] =
	104	{homedir, shell, "PATH=:/usr/ucb:/bin:/usr/bin", username, 0};
	105	char **environ;
	106
	107	struct sockaddr_in asin = { AF_INET };
	108
	109	doit(f, fromp)
	110	int f;
	111	struct sockaddr_in *fromp;
	112	{
	113	char cmdbuf[NCARGS+1], cp, namep;
	114	char user[16], pass[16];
	115	struct passwd *pwd;
	116	int s;
	117	short port;
	118	int pv[2], pid, ready, readfrom, cc;
	119	char buf[BUFSIZ], sig;
	120	int one = 1;
	121
	122	(void) signal(SIGINT, SIG_DFL);
	123	(void) signal(SIGQUIT, SIG_DFL);
	124	(void) signal(SIGTERM, SIG_DFL);
	125	#ifdef DEBUG
	126	{ int t = open("/dev/tty", 2);
	127	if (t >= 0) {
	128	ioctl(t, TIOCNOTTY, (char *)0);
	129	(void) close(t);
	130	}
	131	}
	132	#endif
	133	dup2(f, 0);
	134	dup2(f, 1);
	135	dup2(f, 2);
f0d0adca BJ	136	(void) alarm(60);
	137	port = 0;
	138	for (;;) {
	139	char c;
	140	if (read(f, &c, 1) != 1)
	141	exit(1);
	142	if (c == 0)
	143	break;
	144	port = port * 10 + c - '0';
	145	}
	146	(void) alarm(0);
	147	if (port != 0) {
36a969c5	148	s = socket(AF_INET, SOCK_STREAM, 0, 0);
f0d0adca BJ	149	if (s < 0)
f0d0adca BJ	150	exit(1);
36a969c5 SL	151	if (bind(s, &asin, sizeof (asin), 0) < 0)
36a969c5 SL	152	exit(1);
f0d0adca	153	(void) alarm(60);
36a969c5	154	fromp->sin_port = htons((u_short)port);
94a2d2a7	155	if (connect(s, fromp, sizeof (*fromp), 0) < 0)
f0d0adca BJ	156	exit(1);
	157	(void) alarm(0);
	158	}
	159	getstr(user, sizeof(user), "username");
	160	getstr(pass, sizeof(pass), "password");
	161	getstr(cmdbuf, sizeof(cmdbuf), "command");
	162	setpwent();
	163	pwd = getpwnam(user);
	164	if (pwd == NULL) {
	165	error("Login incorrect.\n");
	166	exit(1);
	167	}
	168	endpwent();
	169	if (*pwd->pw_passwd != '\0') {
	170	namep = crypt(pass, pwd->pw_passwd);
	171	if (strcmp(namep, pwd->pw_passwd)) {
	172	error("Password incorrect.\n");
	173	exit(1);
	174	}
	175	}
	176	if (chdir(pwd->pw_dir) < 0) {
	177	error("No remote directory.\n");
	178	exit(1);
	179	}
	180	(void) write(2, "\0", 1);
	181	if (port) {
	182	(void) pipe(pv);
	183	pid = fork();
	184	if (pid == -1) {
	185	error("Try again.\n");
	186	exit(1);
	187	}
	188	if (pid) {
	189	(void) close(0); (void) close(1); (void) close(2);
	190	(void) close(f); (void) close(pv[1]);
	191	readfrom = (1<<s) \| (1<<pv[0]);
	192	ioctl(pv[1], FIONBIO, (char *)&one);
	193	/* should set s nbio! */
	194	do {
	195	ready = readfrom;
94a2d2a7	196	(void) select(16, &ready, 0, 0, 0);
f0d0adca BJ	197	if (ready & (1<<s)) {
	198	if (read(s, &sig, 1) <= 0)
	199	readfrom &= ~(1<<s);
	200	else
	201	killpg(pid, sig);
	202	}
	203	if (ready & (1<<pv[0])) {
	204	cc = read(pv[0], buf, sizeof (buf));
	205	if (cc <= 0) {
ff24c640	206	shutdown(s, 1+1);
f0d0adca BJ	207	readfrom &= ~(1<<pv[0]);
	208	} else
	209	(void) write(s, buf, cc);
	210	}
	211	} while (readfrom);
	212	exit(0);
	213	}
	214	setpgrp(0, getpid());
	215	(void) close(s); (void)close(pv[0]);
	216	dup2(pv[1], 2);
	217	}
	218	if (*pwd->pw_shell == '\0')
	219	pwd->pw_shell = "/bin/sh";
	220	(void) close(f);
94a2d2a7	221	initgroups(pwd->pw_name, pwd->pw_gid);
f0d0adca BJ	222	(void) setuid(pwd->pw_uid);
	223	(void) setgid(pwd->pw_gid);
	224	environ = envinit;
	225	strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
	226	strncat(shell, pwd->pw_shell, sizeof(shell)-7);
	227	strncat(username, pwd->pw_name, sizeof(username)-6);
	228	cp = rindex(pwd->pw_shell, '/');
	229	if (cp)
	230	cp++;
	231	else
	232	cp = pwd->pw_shell;
	233	execl(pwd->pw_shell, cp, "-c", cmdbuf, 0);
	234	perror(pwd->pw_shell);
	235	exit(1);
	236	}
	237
	238	/* VARARGS 1 */
	239	error(fmt, a1, a2, a3)
	240	char *fmt;
	241	int a1, a2, a3;
	242	{
	243	char buf[BUFSIZ];
	244
	245	buf[0] = 1;
	246	(void) sprintf(buf+1, fmt, a1, a2, a3);
	247	(void) write(2, buf, strlen(buf));
	248	}
	249
	250	getstr(buf, cnt, err)
	251	char *buf;
	252	int cnt;
	253	char *err;
	254	{
	255	char c;
	256
	257	do {
	258	if (read(0, &c, 1) != 1)
	259	exit(1);
	260	*buf++ = c;
	261	if (--cnt == 0) {
	262	error("%s too long\n", err);
	263	exit(1);
	264	}
	265	} while (c != 0);
	266	}