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/*
* This is an rcmd() replacement originally by
* Chris Siebenmann <cks@utcc.utoronto.ca>.
*
* Brought in to pdsh from USC rdist -jg
* Changes:
* - added fd2p arg handling
* - changed name, func prototype, and added sshcmd() and rshcmd() wrappers
* - use 'err' for output
* - unset DISPLAY and call setsid() so ssh won't hang prompting for passphrase
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#if HAVE_SSH
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <signal.h>
#include <errno.h>
#include <netdb.h>
#include <sys/types.h>
#include <stdlib.h> /* putenv */
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_PTHREAD_H
#include <pthread.h>
#endif
#include <string.h> /* memset */
#include "xstring.h"
#include "err.h"
#include "dsh.h"
#include "list.h"
#define HBUF_LEN 1024
/*
* This is a replacement rcmd() function that uses an arbitrary
* program in place of a direct rcmd() function call.
*/
static int
_pipecmd(char *path, char *args[], const char *ahost, int *fd2p)
{
int cpid;
int sp[2], esp[2];
/* get a socketpair we'll use for stdin and stdout. */
if (socketpair(AF_UNIX, SOCK_STREAM, 0, sp) < 0) {
err("%p: socketpair failed for %S: %m\n", ahost);
return -1;
}
if (fd2p) {
if (socketpair(AF_UNIX, SOCK_STREAM, 0, esp) < 0) {
err("%p: socketpair failed for %S: %m\n", ahost);
return -1;
}
}
cpid = fork();
if (cpid < 0) {
err("%p: fork failed for %S: %m\n", ahost);
return -1;
}
if (cpid == 0) {
/* child. we use sp[1] to be stdin/stdout, and close
sp[0]. */
(void) close(sp[0]);
if (dup2(sp[1], 0) < 0 || dup2(0,1) < 0) {
err("%p: dup2 failed for %S: %m\n", ahost);
_exit(255);
}
if (fd2p) { /* stderr has own socketpair */
close(esp[0]);
if (dup2(esp[1], 2) < 0) {
err("%p: dup2 failed for %S: %m\n", ahost);
_exit(255);
}
} else { /* stderr goes with stdout, stdin on sp[1] */
if (dup2(0, 2) < 0) {
err("%p: dup2 failed for %S: %m\n", ahost);
_exit(255);
}
}
/* heroic measures to prevent ssh from prompting for pphrase */
setsid();
putenv("DISPLAY=");
/* fork again to lose parent. */
cpid = fork();
if (cpid < 0) {
err("%p: fork to lose parent failed for %S: %m\n", ahost);
_exit(255);
}
if (cpid > 0)
_exit(0);
/* in grandchild here. */
execv(path, args);
err("%p: execlp %s failed for %S: %m.", path, ahost);
_exit(255);
}
if (cpid > 0) {
/* parent. close sp[1], return sp[0]. */
(void) close(sp[1]);
if (fd2p) {
close(esp[1]);
*fd2p = esp[0];
}
/* reap child. */
(void) wait(0);
return sp[0];
}
/*NOTREACHED*/
return 0;
}
/* pdsh uses this version */
int
sshcmd(char *ahost, char *addr, char *luser, char *ruser, char *cmd,
int rank, int *fd2p)
{
char *prog = xbasename(_PATH_SSH);
char *args[] = { 0, "-q", "-a", "-x", "-f", "-l", 0, 0, 0, 0 };
/* -f args changed for ssh2 (-fo didn't do the same thing as ssh1 -f) */
if (strcmp(prog, "ssh2") == 0)
args[4] = "-oBatchMode yes";
args[0] = prog;
args[6] = ruser; /* solaris cc doesn't like non constant */
args[7] = ahost; /* initializers */
args[8] = cmd;
return _pipecmd(_PATH_SSH, args, ahost, fd2p);
}
/* pdcp uses this version */
int
sshcmdrw(char *ahost, char *addr, char *luser, char *ruser, char *cmd,
int rank, int *fd2p)
{
char *prog = xbasename(_PATH_SSH);
char *args[] = { 0, "-q", "-a", "-x", "-l", 0, 0, 0, 0 };
args[0] = prog;
args[5] = ruser; /* solaris cc doesn't like non constant */
args[6] = ahost; /* initializers */
args[7] = cmd;
return _pipecmd(_PATH_SSH, args, ahost, fd2p);
}
void
sshcmd_init(opt_t *opt)
{
/* not implemented */
}
void
sshcmd_signal(int fd, int signum)
{
/* not implemented */
}
#if 0
int
rshcmd(char *ahost, char *luser, char *ruser, char *cmd, int *fd2p)
{
char *args[] = { "rsh", 0, "-l", 0, 0, 0 };
args[1] = ahost; /* solaris cc doesn't like non constant */
args[3] = ruser; /* initializers */
args[4] = cmd;
return _pipecmd(_PATH_RSH, args, ahost, fd2p);
}
#endif
#endif /* HAVE_SSH */
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