125 lines
2.6 KiB
C
125 lines
2.6 KiB
C
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/*
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* This is an rcmd() replacement originally by
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* Chris Siebenmann <cks@utcc.utoronto.ca>.
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*/
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#ifndef lint
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static char RCSid[] =
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"$Id$";
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#endif
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#include "defs.h"
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#if !defined(DIRECT_RCMD)
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include <errno.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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static char *
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xbasename(s)
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char *s;
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{
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char *ret;
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ret = strrchr(s, '/');
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if (ret && ret[1])
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return (ret + 1);
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return s;
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}
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/*
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* This is a replacement rcmd() function that uses the rsh(1c)
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* program in place of a direct rcmd() function call so as to
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* avoid having to be root.
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*/
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int
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rshrcmd(ahost, port, luser, ruser, cmd, fd2p)
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char **ahost;
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u_short port;
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char *luser, *ruser, *cmd;
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int *fd2p;
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{
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int cpid;
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struct hostent *hp;
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int sp[2];
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/* insure that we are indeed being used as we thought. */
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if (fd2p != 0)
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return -1;
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/* validate remote hostname. */
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hp = gethostbyname(*ahost);
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if (hp == 0) {
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error("%s: unknown host", *ahost);
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return -1;
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}
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/* *ahost = hp->h_name; *//* This makes me nervous. */
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/* get a socketpair we'll use for stdin and stdout. */
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, sp) < 0) {
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error("socketpair(AF_UNIX, SOCK_STREAM, 0) failed: %s.",
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strerror(errno));
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return -1;
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}
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cpid = fork();
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if (cpid < 0) {
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error("fork failed: %s.", strerror(errno));
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return -1; /* error. */
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}
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if (cpid == 0) {
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/* child. we use sp[1] to be stdin/stdout, and close
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sp[0]. */
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(void) close(sp[0]);
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if (dup2(sp[1], 0) < 0 || dup2(0,1) < 0) {
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error("dup2 failed: %s.", strerror(errno));
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_exit(255);
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}
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/* fork again to lose parent. */
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cpid = fork();
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if (cpid < 0) {
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error("fork to lose parent failed: %s.", strerror(errno));
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_exit(255);
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}
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if (cpid > 0)
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_exit(0);
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/* in grandchild here. */
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/*
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* If we are rdist'ing to "localhost" as the same user
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* as we are, then avoid running remote shell for efficiency.
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*/
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if (strcmp(*ahost, "localhost") == 0 &&
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strcmp(luser, ruser) == 0) {
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execlp(_PATH_BSHELL, xbasename(_PATH_BSHELL), "-c",
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cmd, (char *) NULL);
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error("execlp %s failed: %s.", _PATH_BSHELL, strerror(errno));
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} else {
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execlp(path_rsh, xbasename(path_rsh),
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*ahost, "-l", ruser, cmd, (char *) NULL);
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error("execlp %s failed: %s.", path_rsh,
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strerror(errno));
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}
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_exit(255);
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}
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if (cpid > 0) {
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/* parent. close sp[1], return sp[0]. */
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(void) close(sp[1]);
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/* reap child. */
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(void) wait(0);
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return sp[0];
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}
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/*NOTREACHED*/
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return (-1);
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}
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#endif /* !DIRECT_RCMD */
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