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

#ifndef lint
static char sccsid[] = "@(#)rexecd.c	4.6 83/01/07";
#endif

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

#include <netinet/in.h>

#include <stdio.h>
#include <errno.h>
#include <pwd.h>
#include <wait.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();
/*
 * remote execute server:
 *	username\0
 *	password\0
 *	command\0
 *	data
 */
main(argc, argv)
	int argc;
	char **argv;
{
	union wait status;
	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);
	}
	listen(f, 10);
	for (;;) {
		int s, len = sizeof (from);

		s = accept(f, &from, &len, 0);
		if (s < 0) {
			perror("rexecd: accept");
			sleep(1);
			continue;
		}
		if (fork() == 0)
			doit(s, &from);
		(void) close(s);
		while (wait3(status, WNOHANG, 0) > 0)
			continue;
	}
}

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
ff24c640	2	static char sccsid[] = "@(#)rexecd.c 4.6 83/01/07";
f0d0adca BJ	3	#endif
f0d0adca BJ	4
f0d0adca BJ	5	#include <sys/ioctl.h>
	6	#include <sys/param.h>
	7	#include <sys/socket.h>
94a2d2a7 SL	8
	9	#include <netinet/in.h>
	10
	11	#include <stdio.h>
f0d0adca BJ	12	#include <errno.h>
	13	#include <pwd.h>
	14	#include <wait.h>
	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 */
	23	int error();
	24	/*
	25	* remote execute server:
	26	* username\0
	27	* password\0
	28	* command\0
	29	* data
	30	*/
	31	main(argc, argv)
	32	int argc;
	33	char **argv;
	34	{
	35	union wait status;
	36	int f;
	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	}
	71	listen(f, 10);
f0d0adca	72	for (;;) {
94a2d2a7 SL	73	int s, len = sizeof (from);
	74
	75	s = accept(f, &from, &len, 0);
	76	if (s < 0) {
	77	perror("rexecd: accept");
f0d0adca BJ	78	sleep(1);
	79	continue;
	80	}
	81	if (fork() == 0)
94a2d2a7 SL	82	doit(s, &from);
	83	(void) close(s);
	84	while (wait3(status, WNOHANG, 0) > 0)
f0d0adca BJ	85	continue;
	86	}
	87	}
	88
	89	char username[20] = "USER=";
	90	char homedir[64] = "HOME=";
	91	char shell[64] = "SHELL=";
	92	char *envinit[] =
	93	{homedir, shell, "PATH=:/usr/ucb:/bin:/usr/bin", username, 0};
	94	char **environ;
	95
	96	struct sockaddr_in asin = { AF_INET };
	97
	98	doit(f, fromp)
	99	int f;
	100	struct sockaddr_in *fromp;
	101	{
	102	char cmdbuf[NCARGS+1], cp, namep;
	103	char user[16], pass[16];
	104	struct passwd *pwd;
	105	int s;
	106	short port;
	107	int pv[2], pid, ready, readfrom, cc;
	108	char buf[BUFSIZ], sig;
	109	int one = 1;
	110
	111	(void) signal(SIGINT, SIG_DFL);
	112	(void) signal(SIGQUIT, SIG_DFL);
	113	(void) signal(SIGTERM, SIG_DFL);
	114	#ifdef DEBUG
	115	{ int t = open("/dev/tty", 2);
	116	if (t >= 0) {
	117	ioctl(t, TIOCNOTTY, (char *)0);
	118	(void) close(t);
	119	}
	120	}
	121	#endif
	122	dup2(f, 0);
	123	dup2(f, 1);
	124	dup2(f, 2);
f0d0adca BJ	125	(void) alarm(60);
	126	port = 0;
	127	for (;;) {
	128	char c;
	129	if (read(f, &c, 1) != 1)
	130	exit(1);
	131	if (c == 0)
	132	break;
	133	port = port * 10 + c - '0';
	134	}
	135	(void) alarm(0);
	136	if (port != 0) {
36a969c5	137	s = socket(AF_INET, SOCK_STREAM, 0, 0);
f0d0adca BJ	138	if (s < 0)
f0d0adca BJ	139	exit(1);
36a969c5 SL	140	if (bind(s, &asin, sizeof (asin), 0) < 0)
36a969c5 SL	141	exit(1);
f0d0adca	142	(void) alarm(60);
36a969c5	143	fromp->sin_port = htons((u_short)port);
94a2d2a7	144	if (connect(s, fromp, sizeof (*fromp), 0) < 0)
f0d0adca BJ	145	exit(1);
	146	(void) alarm(0);
	147	}
	148	getstr(user, sizeof(user), "username");
	149	getstr(pass, sizeof(pass), "password");
	150	getstr(cmdbuf, sizeof(cmdbuf), "command");
	151	setpwent();
	152	pwd = getpwnam(user);
	153	if (pwd == NULL) {
	154	error("Login incorrect.\n");
	155	exit(1);
	156	}
	157	endpwent();
	158	if (*pwd->pw_passwd != '\0') {
	159	namep = crypt(pass, pwd->pw_passwd);
	160	if (strcmp(namep, pwd->pw_passwd)) {
	161	error("Password incorrect.\n");
	162	exit(1);
	163	}
	164	}
	165	if (chdir(pwd->pw_dir) < 0) {
	166	error("No remote directory.\n");
	167	exit(1);
	168	}
	169	(void) write(2, "\0", 1);
	170	if (port) {
	171	(void) pipe(pv);
	172	pid = fork();
	173	if (pid == -1) {
	174	error("Try again.\n");
	175	exit(1);
	176	}
	177	if (pid) {
	178	(void) close(0); (void) close(1); (void) close(2);
	179	(void) close(f); (void) close(pv[1]);
	180	readfrom = (1<<s) \| (1<<pv[0]);
	181	ioctl(pv[1], FIONBIO, (char *)&one);
	182	/* should set s nbio! */
	183	do {
	184	ready = readfrom;
94a2d2a7	185	(void) select(16, &ready, 0, 0, 0);
f0d0adca BJ	186	if (ready & (1<<s)) {
	187	if (read(s, &sig, 1) <= 0)
	188	readfrom &= ~(1<<s);
	189	else
	190	killpg(pid, sig);
	191	}
	192	if (ready & (1<<pv[0])) {
	193	cc = read(pv[0], buf, sizeof (buf));
	194	if (cc <= 0) {
ff24c640	195	shutdown(s, 1+1);
f0d0adca BJ	196	readfrom &= ~(1<<pv[0]);
	197	} else
	198	(void) write(s, buf, cc);
	199	}
	200	} while (readfrom);
	201	exit(0);
	202	}
	203	setpgrp(0, getpid());
	204	(void) close(s); (void)close(pv[0]);
	205	dup2(pv[1], 2);
	206	}
	207	if (*pwd->pw_shell == '\0')
	208	pwd->pw_shell = "/bin/sh";
	209	(void) close(f);
94a2d2a7	210	initgroups(pwd->pw_name, pwd->pw_gid);
f0d0adca BJ	211	(void) setuid(pwd->pw_uid);
	212	(void) setgid(pwd->pw_gid);
	213	environ = envinit;
	214	strncat(homedir, pwd->pw_dir, sizeof(homedir)-6);
	215	strncat(shell, pwd->pw_shell, sizeof(shell)-7);
	216	strncat(username, pwd->pw_name, sizeof(username)-6);
	217	cp = rindex(pwd->pw_shell, '/');
	218	if (cp)
	219	cp++;
	220	else
	221	cp = pwd->pw_shell;
	222	execl(pwd->pw_shell, cp, "-c", cmdbuf, 0);
	223	perror(pwd->pw_shell);
	224	exit(1);
	225	}
	226
	227	/* VARARGS 1 */
	228	error(fmt, a1, a2, a3)
	229	char *fmt;
	230	int a1, a2, a3;
	231	{
	232	char buf[BUFSIZ];
	233
	234	buf[0] = 1;
	235	(void) sprintf(buf+1, fmt, a1, a2, a3);
	236	(void) write(2, buf, strlen(buf));
	237	}
	238
	239	getstr(buf, cnt, err)
	240	char *buf;
	241	int cnt;
	242	char *err;
	243	{
	244	char c;
	245
	246	do {
	247	if (read(0, &c, 1) != 1)
	248	exit(1);
	249	*buf++ = c;
	250	if (--cnt == 0) {
	251	error("%s too long\n", err);
	252	exit(1);
	253	}
	254	} while (c != 0);
	255	}