FreeBSD-5.3/usr.sbin/rpc.ypupdated/update.c
/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user or with the express written consent of
* Sun Microsystems, Inc.
*
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)update.c 1.2 91/03/11 Copyr 1986 Sun Micro";
#endif
static const char rcsid[] =
"$FreeBSD: src/usr.sbin/rpc.ypupdated/update.c,v 1.7 2002/02/06 15:26:05 des Exp $";
#endif /* not lint */
/*
* Copyright (C) 1986, 1989, Sun Microsystems, Inc.
*/
/*
* Administrative tool to add a new user to the publickey database
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include <rpc/key_prot.h>
#ifdef YP
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#include <sys/wait.h>
#include <netdb.h>
#endif /* YP */
#include <pwd.h>
#include <string.h>
#include <sys/resource.h>
#include <stdlib.h>
#include "ypupdated_extern.h"
#ifdef YP
#define MAXMAPNAMELEN 256
#else
#define YPOP_CHANGE 1 /* change, do not add */
#define YPOP_INSERT 2 /* add, do not change */
#define YPOP_DELETE 3 /* delete this entry */
#define YPOP_STORE 4 /* add, or change */
#endif
#ifdef YP
static char SHELL[] = "/bin/sh";
static char YPDBPATH[]="/var/yp"; /* This is defined but not used! */
static char PKMAP[] = "publickey.byname";
static char UPDATEFILE[] = "updaters";
static char PKFILE[] = "/etc/publickey";
#endif /* YP */
#ifdef YP
static int _openchild(char *, FILE **, FILE **);
/*
* Determine if requester is allowed to update the given map,
* and update it if so. Returns the yp status, which is zero
* if there is no access violation.
*/
int
mapupdate(char *requester, char *mapname, u_int op, u_int keylen, char *key,
u_int datalen, char *data)
{
char updater[MAXMAPNAMELEN + 40];
FILE *childargs;
FILE *childrslt;
#ifdef WEXITSTATUS
int status;
#else
union wait status;
#endif
pid_t pid;
u_int yperrno;
#ifdef DEBUG
printf("%s %s\n", key, data);
#endif
(void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */
UPDATEFILE, mapname);
pid = _openchild(updater, &childargs, &childrslt);
if (pid < 0) {
return (YPERR_YPERR);
}
/*
* Write to child
*/
(void)fprintf(childargs, "%s\n", requester);
(void)fprintf(childargs, "%u\n", op);
(void)fprintf(childargs, "%u\n", keylen);
(void)fwrite(key, (int)keylen, 1, childargs);
(void)fprintf(childargs, "\n");
(void)fprintf(childargs, "%u\n", datalen);
(void)fwrite(data, (int)datalen, 1, childargs);
(void)fprintf(childargs, "\n");
(void)fclose(childargs);
/*
* Read from child
*/
(void)fscanf(childrslt, "%d", &yperrno);
(void)fclose(childrslt);
(void)wait(&status);
#ifdef WEXITSTATUS
if (WEXITSTATUS(status) != 0)
#else
if (status.w_retcode != 0)
#endif
return (YPERR_YPERR);
return (yperrno);
}
/*
* returns pid, or -1 for failure
*/
static int
_openchild(char *command, FILE **fto, FILE **ffrom)
{
int i;
pid_t pid;
int pdto[2];
int pdfrom[2];
char *com;
struct rlimit rl;
if (pipe(pdto) < 0) {
goto error1;
}
if (pipe(pdfrom) < 0) {
goto error2;
}
switch (pid = fork()) {
case -1:
goto error3;
case 0:
/*
* child: read from pdto[0], write into pdfrom[1]
*/
(void)close(0);
(void)dup(pdto[0]);
(void)close(1);
(void)dup(pdfrom[1]);
getrlimit(RLIMIT_NOFILE, &rl);
for (i = rl.rlim_max - 1; i >= 3; i--) {
(void) close(i);
}
com = malloc((unsigned) strlen(command) + 6);
if (com == NULL) {
_exit(~0);
}
(void)sprintf(com, "exec %s", command);
execl(SHELL, basename(SHELL), "-c", com, (char *)NULL);
_exit(~0);
default:
/*
* parent: write into pdto[1], read from pdfrom[0]
*/
*fto = fdopen(pdto[1], "w");
(void)close(pdto[0]);
*ffrom = fdopen(pdfrom[0], "r");
(void)close(pdfrom[1]);
break;
}
return (pid);
/*
* error cleanup and return
*/
error3:
(void)close(pdfrom[0]);
(void)close(pdfrom[1]);
error2:
(void)close(pdto[0]);
(void)close(pdto[1]);
error1:
return (-1);
}
static char *
basename(char *path)
{
char *p;
p = strrchr(path, '/');
if (p == NULL) {
return (path);
} else {
return (p + 1);
}
}
#else /* YP */
static int match(char *, char *);
/*
* Determine if requester is allowed to update the given map,
* and update it if so. Returns the status, which is zero
* if there is no access violation. This function updates
* the local file and then shuts up.
*/
int
localupdate(char *name, char *filename, u_int op, u_int keylen __unused,
char *key, u_int datalen __unused, char *data)
{
char line[256];
FILE *rf;
FILE *wf;
char *tmpname;
int err;
/*
* Check permission
*/
if (strcmp(name, key) != 0) {
return (ERR_ACCESS);
}
if (strcmp(name, "nobody") == 0) {
/*
* Can't change "nobody"s key.
*/
return (ERR_ACCESS);
}
/*
* Open files
*/
tmpname = malloc(strlen(filename) + 4);
if (tmpname == NULL) {
return (ERR_MALLOC);
}
sprintf(tmpname, "%s.tmp", filename);
rf = fopen(filename, "r");
if (rf == NULL) {
return (ERR_READ);
}
wf = fopen(tmpname, "w");
if (wf == NULL) {
return (ERR_WRITE);
}
err = -1;
while (fgets(line, sizeof (line), rf)) {
if (err < 0 && match(line, name)) {
switch (op) {
case YPOP_INSERT:
err = ERR_KEY;
break;
case YPOP_STORE:
case YPOP_CHANGE:
fprintf(wf, "%s %s\n", key, data);
err = 0;
break;
case YPOP_DELETE:
/* do nothing */
err = 0;
break;
}
} else {
fputs(line, wf);
}
}
if (err < 0) {
switch (op) {
case YPOP_CHANGE:
case YPOP_DELETE:
err = ERR_KEY;
break;
case YPOP_INSERT:
case YPOP_STORE:
err = 0;
fprintf(wf, "%s %s\n", key, data);
break;
}
}
fclose(wf);
fclose(rf);
if (err == 0) {
if (rename(tmpname, filename) < 0) {
return (ERR_DBASE);
}
} else {
if (unlink(tmpname) < 0) {
return (ERR_DBASE);
}
}
return (err);
}
static int
match(char *line, char *name)
{
int len;
len = strlen(name);
return (strncmp(line, name, len) == 0 &&
(line[len] == ' ' || line[len] == '\t'));
}
#endif /* !YP */