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8fc8fa80899c66937979cd5b807766a40b74cd13
irix-657m-src/eoe/cmd/sun/rexd/rexd.c
calmsacibis995 8fc8fa8089 Source code upload
2022-09-29 17:59:04 +03:00

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/* @(#)rexd.c 1.3 87/08/13 3.2/4.3NFSSRC */
# ifdef lint
static char sccsid[] = "@(#)rexd.c 1.1 86/09/25 Copyright 1985, 1987 Sun Microsystems, Inc.";
/*
*
* NFSSRC 3.2/4.3 for the VAX*
* Copyright (C) 1987 Sun Microsystems, Inc.
*
* (*)VAX is a trademark of Digital Equipment Corporation
*
*/
# endif lint
/*
* rexd - a remote execution daemon based on SUN Remote Procedure Calls
*
* Copyright (c) 1985, 1987 Sun Microsystems, Inc.
*/
#include <sys/param.h>
#include <rpc/rpc.h>
#include <stdio.h>
#include <netdb.h>
#include <signal.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <syslog.h>
# include "rexioctl.h"
#include <mntent.h>
#include <errno.h>
#include <syslog.h>
#include "rex.h"
# define ListnerTimeout 300 /* seconds listner stays alive */
# define WaitLimit 10 /* seconds to wait after io is closed */
SVCXPRT *ListnerTransp; /* non-null means still a listner */
static char **Argv; /* saved argument vector (for ps) */
static char *LastArgv; /* saved end-of-argument vector */
/*
* The original code uses fprintfs to log messages. The following
* hacks change the printfs and perrors into syslog calls.
*
* Note: to avoid "rexd: rexd: " syslog entries, the leading "rexd:"
* was removed from all error messages in this file. No ifdef's were used.
*/
extern int using_syslog;
#define fprintf syslog
#undef stderr
#define stderr LOG_ERR
static void
perror(msg)
const char *msg;
{
syslog(LOG_ERR, "%s: %m", msg);
}
#define killpg(pid, sig) kill(-pid, sig);
fd_set HelperMask; /* files for interactive mode */
main(argc, argv)
int argc;
char **argv;
{
/*
* the server is a typical RPC daemon, except that we only
* accept TCP connections.
*/
struct sockaddr_in addr;
int len = sizeof(struct sockaddr_in);
void dorex();
void ListnerTimer(), CatchChild();
fd_set readfds;
/*
* Remember the start and extent of argv for setproctitle().
* Open the console for error printouts, but don't let it be
* our controlling terminal.
*/
Argv = argv;
if (argc > 0)
LastArgv = argv[argc-1] + strlen(argv[argc-1]);
else
LastArgv = NULL;
openlog("rexd", LOG_PID, LOG_AUTH);
using_syslog = 1;
signal(SIGPIPE, SIG_IGN);
NoControl();
signal(SIGCHLD, CatchChild);
signal(SIGALRM, ListnerTimer);
# ifdef NOINETD
if ((ListnerTransp = svctcp_create(RPC_ANYSOCK, 0, 0)) == NULL) {
fprintf(stderr, "svctcp_create: error\n");
exit(1);
}
pmap_unset(REXPROG, REXVERS);
if (!svc_register(ListnerTransp, REXPROG, REXVERS,
dorex, IPPROTO_TCP)) {
fprintf(stderr, "service rpc register: error\n");
exit(1);
}
# else NOINETD
if ((ListnerTransp = svctcp_create(0, 0, 0)) == NULL) {
fprintf(stderr, "svctcp_create: error\n");
exit(1);
}
if (!svc_register(ListnerTransp, REXPROG, REXVERS, dorex, 0)) {
fprintf(stderr, "service rpc register: error\n");
exit(1);
}
alarm(ListnerTimeout);
# endif NOINETD
/*
* normally we would call svc_run() at this point, but we need to be informed
* of when the RPC connection is broken, in case the other side crashes.
*/
while (TRUE) {
extern fd_set svc_fdset;
extern int errno;
fd_set tmp_fd;
if ( !test_fd(&svc_fdset) ) {
char *foo;
(void) rex_wait(&foo);
exit(1);
}
readfds = svc_fdset;
fd_or(&readfds, &HelperMask);
switch (select(FD_SETSIZE, &readfds, (fd_set *)0, (fd_set *)0, 0)) {
case -1: if (errno == EINTR) continue;
perror("select failed");
exit(1);
case 0:
fprintf(stderr,"Select returned zero\r\n");
continue;
default:
tmp_fd = readfds;
if (test_fd(&HelperMask)) {
fd_and(&tmp_fd, &HelperMask);
HelperRead(tmp_fd);
}
fd_and(&readfds, &svc_fdset);
svc_getreqset(&readfds);
}
}
}
/*
* This function gets called after the listner has timed out waiting
* for any new connections coming in.
*/
void
ListnerTimer()
{
svc_destroy(ListnerTransp);
exit(0);
}
/*
* dorex - handle one of the rex procedure calls, dispatching to the
* correct function.
*/
void
dorex(rqstp, transp)
register struct svc_req *rqstp;
register SVCXPRT *transp;
{
struct rex_start *rst;
struct rex_result result;
void rex_cleanup();
if (ListnerTransp) {
/*
* First call - fork a server for this connection
*/
extern fd_set svc_fdset;
int fd, pid;
pid = fork();
if (pid > 0) {
/*
* Parent - return to service loop to accept further
* connections.
*/
alarm(ListnerTimeout);
xprt_unregister(transp);
close(transp->xp_sock);
FD_CLR(transp->xp_sock, &svc_fdset);
return;
}
/*
* child - close listner transport to avoid confusion
* Also need to close all other service transports
* besides the one we are interested in.
*/
alarm(0);
if (transp != ListnerTransp) {
close(ListnerTransp->xp_sock);
xprt_unregister(ListnerTransp);
}
ListnerTransp = NULL;
for (fd=0; fd<FD_SETSIZE; fd++)
if (fd != transp->xp_sock && FD_ISSET(fd, &svc_fdset) ) {
close(fd);
FD_CLR(fd, &svc_fdset);
}
}
switch (rqstp->rq_proc) {
case NULLPROC:
if (svc_sendreply(transp, xdr_void, 0) == FALSE) {
fprintf(stderr, "nullproc err");
exit(1);
}
return;
case REXPROC_START:
rst = (struct rex_start *)malloc(sizeof (struct rex_start));
bzero((char *)rst, sizeof *rst);
if (svc_getargs(transp, xdr_rex_start, rst) == FALSE) {
svcerr_decode(transp);
exit(1);
}
if (rqstp->rq_cred.oa_flavor != AUTH_UNIX) {
svcerr_auth(transp, AUTH_BADCRED);
exit(1);
}
result.rlt_stat = rex_start(rst,
(struct authunix_parms *)rqstp->rq_clntcred,
&result.rlt_message, transp->xp_sock);
if (svc_sendreply(transp, xdr_rex_result, &result) == FALSE) {
fprintf(stderr, "reply failed\n");
rex_cleanup();
exit(1);
}
if (result.rlt_stat) {
rex_cleanup();
exit(0);
}
return;
case REXPROC_MODES:
{
struct rex_ttymode mode;
if (svc_getargs(transp, xdr_rex_ttymode, &mode)==FALSE) {
svcerr_decode(transp);
exit(1);
}
SetPtyMode(&mode);
if (svc_sendreply(transp, xdr_void, 0) == FALSE) {
fprintf(stderr, "mode reply failed");
exit(1);
}
}
return;
case REXPROC_WINCH:
{
struct ttysize size;
if (svc_getargs(transp, xdr_rex_ttysize, &size)==FALSE) {
svcerr_decode(transp);
exit(1);
}
SetPtySize(&size);
if (svc_sendreply(transp, xdr_void, 0) == FALSE) {
fprintf(stderr, "window change reply failed");
exit(1);
}
}
return;
case REXPROC_SIGNAL:
{
int sigNumber;
if (svc_getargs(transp, xdr_int, &sigNumber)==FALSE) {
svcerr_decode(transp);
exit(1);
}
SendSignal(sigNumber);
if (svc_sendreply(transp, xdr_void, 0) == FALSE) {
fprintf(stderr, "signal reply failed");
exit(1);
}
}
return;
case REXPROC_WAIT:
result.rlt_stat = rex_wait(&result.rlt_message);
if (svc_sendreply(transp, xdr_rex_result, &result) == FALSE) {
fprintf(stderr, "reply failed\n");
exit(1);
}
exit(0);
/* NOTREACHED */
default:
svcerr_noproc(transp);
exit(1);
}
}
int HasHelper = 0; /* must kill helpers (interactive mode) */
int child = 0; /* pid of the executed process */
int ChildStatus = 0; /* saved return status of child */
int ChildDied = 0; /* true when above is valid */
char nfsdir[MAXPATHLEN]; /* file system we mounted */
char *tmpdir; /* where above is mounted, NULL if none */
/*
* signal handler for SIGCHLD - called when user process dies
*/
void
CatchChild()
{
int pid;
wait_t status;
pid = wait3(&status, WNOHANG, NULL);
if (pid==child) {
ChildStatus = status.w_status;
ChildDied = 1;
if (HasHelper) KillHelper(child);
HasHelper = 0;
}
signal(SIGCHLD, CatchChild);
}
/*
* rex_wait - wait for command to finish, unmount the file system,
* and return the exit status.
* message gets an optional string error message.
*/
rex_wait(message)
char **message;
{
static char error[1024];
int count;
*message = error;
strcpy("",error);
if (child == 0) {
errprintf(error,"No process to wait for!\n");
rex_cleanup();
return (1);
}
kill(child, SIGHUP);
for (count=0;!ChildDied && count<WaitLimit;count++)
sleep(1);
rex_cleanup();
if (ChildStatus & 0xFF)
return (ChildStatus);
return (ChildStatus >> 8);
}
/*
* cleanup - unmount and remove our temporary directory
*/
void
rex_cleanup()
{
if (tmpdir) {
chdir("/");
if (umount_nfs(nfsdir, tmpdir))
fprintf(stderr,
"couldn't umount %s\n", nfsdir);
rmdir(tmpdir);
tmpdir = NULL;
}
if (HasHelper) KillHelper(child);
HasHelper = 0;
}
/*
* This function does the server work to get a command executed
* Returns 0 if OK, nonzero if error
*/
rex_start(rst, ucred, message, sock)
struct rex_start *rst;
struct authunix_parms *ucred;
char **message;
int sock;
{
char hostname[255];
char *p, *wdhost, *fsname, *subdir;
char dirbuf[1024];
static char error[1024];
char defaultShell[1024];
struct sockaddr_in sin;
int len;
int fd0, fd1, fd2;
uid_t euid, egid;
extern char **environ;
if (child) { /* already started */
killpg(child, SIGKILL);
return (1);
}
*message = error;
strcpy("",error);
signal(SIGCHLD, CatchChild);
if (ValidUser(ucred->aup_machname,ucred->aup_uid,error,defaultShell))
return(1);
wdhost = rst->rst_host;
fsname = rst->rst_fsname;
subdir = rst->rst_dirwithin;
gethostname(hostname, 255);
if (strcmp(wdhost, hostname) == 0) {
/*
* The requested directory is local to our machine,
* so just change to it.
*/
strcpy(dirbuf,fsname);
strcat(dirbuf,subdir);
if (chdir(dirbuf)) {
errprintf(error, "can't chdir to %s\n", dirbuf);
return (1);
}
} else {
strcpy(dirbuf,wdhost);
strcat(dirbuf,":");
strcat(dirbuf,fsname);
if (AlreadyMounted(dirbuf)) {
/*
* The requested directory is already mounted, so
* just change to it. It might be mounted in a
* different place, so be careful.
* (dirbuf is modified in place!)
*/
strcat(dirbuf, subdir);
egid = getegid();
setegid(ucred->aup_gid);
euid = geteuid();
seteuid(ucred->aup_uid);
if (chdir(dirbuf)) {
errprintf(error,
"can't chdir to %s\n", dirbuf);
setegid(egid);
seteuid(euid);
return (1);
}
setegid(egid);
seteuid(euid);
}
else {
/*
* The requested directory is not mounted anywhere,
* so try to mount our own copy of it. We set nfsdir
* so that it gets unmounted later, and tmpdir so that
* it also gets removed when we are done.
*/
tmpdir = mktemp("/var/tmp_rex/rexdXXXXXX");
if (mkdir(tmpdir, 0777)) {
errprintf(error,
"can't create %s\n", tmpdir);
perror(tmpdir);
return(1);
}
if (mount_nfs(dirbuf, tmpdir, error)) {
return(1);
}
strcpy(nfsdir, dirbuf);
strcpy(dirbuf, tmpdir);
strcat(dirbuf, subdir);
egid = getegid();
setegid(ucred->aup_gid);
euid = geteuid();
seteuid(ucred->aup_uid);
if (chdir(dirbuf)) {
errprintf(error,
"can't chdir to %s\n", dirbuf);
setegid(egid);
seteuid(euid);
return (1);
}
setegid(egid);
seteuid(euid);
}
}
len = sizeof sin;
if (getpeername(sock, &sin, &len)) {
perror("getpeername");
exit(1);
}
fd0 = socket(AF_INET, SOCK_STREAM, 0);
fd0 = doconnect(&sin, rst->rst_port0,fd0);
if (rst->rst_port0 == rst->rst_port1) {
/*
* use the same connection for both stdin and stdout
*/
fd1 = fd0;
}
if (rst->rst_flags & REX_INTERACTIVE) {
/*
* allocate a pseudo-terminal pair if necessary
*/
if (AllocatePty(fd0,fd1)) {
errprintf(error,"cannot allocate a pty\n");
return (1);
}
HasHelper = 1;
}
child = fork();
if (child < 0) {
errprintf(error, "can't fork\n");
return (1);
}
if (child) {
/*
* parent rexd: close network connections if needed,
* then return to the main loop.
*/
if ((rst->rst_flags & REX_INTERACTIVE)==0) {
close(fd0);
close(fd1);
}
return (0);
}
if (rst->rst_port0 != rst->rst_port1) {
fd1 = socket(AF_INET, SOCK_STREAM, 0);
shutdown(fd0, 1);
fd1 = doconnect(&sin, rst->rst_port1,fd1);
shutdown(fd1, 0);
}
if (rst->rst_port1 == rst->rst_port2) {
/*
* Use the same connection for both stdout and stderr
*/
fd2 = fd1;
} else {
fd2 = socket(AF_INET, SOCK_STREAM, 0);
fd2 = doconnect(&sin, rst->rst_port2,fd2);
shutdown(fd2, 0);
}
if (rst->rst_flags & REX_INTERACTIVE) {
/*
* use ptys instead of sockets in interactive mode
*/
DoHelper(&fd0, &fd1, &fd2);
}
dup2(fd0, 0);
dup2(fd1, 1);
dup2(fd2, 2);
for (fd0 = 3; fd0 < getdtablesize(); fd0++)
close(fd0);
environ = rst->rst_env;
setgid(ucred->aup_gid);
setuid(ucred->aup_uid);
signal( SIGINT, SIG_DFL);
signal( SIGHUP, SIG_DFL);
signal( SIGQUIT, SIG_DFL);
if (rst->rst_cmd[0]==NULL) {
/*
* Null command means execute the default shell for this user
*/
char *args[2];
args[0] = defaultShell;
args[1] = NULL;
execvp(defaultShell, args);
fprintf(stderr, "can't exec shell %s\n", defaultShell);
exit(1);
}
execvp(rst->rst_cmd[0], rst->rst_cmd);
fprintf(stderr, "can't exec %s\n", rst->rst_cmd[0]);
exit(1);
/* NOTREACHED */
}
AlreadyMounted(fsname)
char *fsname;
{
/*
* Search the mount table to see if the given file system is already
* mounted. If so, return the place that it is mounted on.
*/
FILE *table;
register struct mntent *mt;
table = setmntent(MOUNTED,"r");
while ( (mt = getmntent(table)) != NULL) {
if (strcmp(mt->mnt_fsname,fsname) == 0) {
strcpy(fsname,mt->mnt_dir);
endmntent(table);
return(1);
}
}
endmntent(table);
return(0);
}
/*
* connect to the indicated IP address/port, and return the
* resulting file descriptor.
*/
doconnect(sin, port, fd)
struct sockaddr_in *sin;
short port;
int fd;
{
sin->sin_port = ntohs(port);
if (connect(fd, sin, sizeof *sin)) {
perror("connect");
exit(1);
}
return (fd);
}
/*
* SETPROCTITLE -- set the title of this process for "ps"
*
* none.
*
* Side Effects:
* Clobbers argv[] of our main procedure.
*/
void
setproctitle(user, host)
char *user, *host;
{
register char *tohere;
tohere = Argv[0];
if (LastArgv == NULL ||
strlen(user) + strlen(host)+3 > (LastArgv - tohere))
return;
*tohere++ = '-'; /* So ps prints (rpc.rexd) */
sprintf(tohere, "%s@%s", user, host);
while (*tohere++) ; /* Skip to end of printf output */
while (tohere < LastArgv) *tohere++ = ' '; /* Avoid confusing ps */
}
/*
* NFSSRC 3.2/4.3 for the VAX*
* Copyright (C) 1987 Sun Microsystems, Inc.
*
* (*)VAX is a trademark of Digital Equipment Corporation
*/
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