330e445c29
PR: bin/83344 , kern/81987 Reviewed by: alfred Approved by: re (kensmith) MFC after: 1 week
277 lines
8.6 KiB
C
277 lines
8.6 KiB
C
/* $NetBSD: getnetpath.c,v 1.3 2000/07/06 03:10:34 christos Exp $ */
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "@(#)getnetpath.c 1.11 91/12/19 SMI";
|
|
#endif
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* Copyright (c) 1989 by Sun Microsystems, Inc.
|
|
*/
|
|
|
|
#include "namespace.h"
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#include <netconfig.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <syslog.h>
|
|
#include "un-namespace.h"
|
|
|
|
/*
|
|
* internal structure to keep track of a netpath "session"
|
|
*/
|
|
struct netpath_chain {
|
|
struct netconfig *ncp; /* an nconf entry */
|
|
struct netpath_chain *nchain_next; /* next nconf entry allocated */
|
|
};
|
|
|
|
|
|
struct netpath_vars {
|
|
int valid; /* token that indicates a valid netpath_vars */
|
|
void *nc_handlep; /* handle for current netconfig "session" */
|
|
char *netpath; /* pointer to current view-point in NETPATH */
|
|
char *netpath_start; /* pointer to start of our copy of NETPATH */
|
|
struct netpath_chain *ncp_list; /* list of nconfs allocated this session*/
|
|
};
|
|
|
|
#define NP_VALID 0xf00d
|
|
#define NP_INVALID 0
|
|
|
|
char *_get_next_token(char *, int);
|
|
|
|
|
|
/*
|
|
* A call to setnetpath() establishes a NETPATH "session". setnetpath()
|
|
* must be called before the first call to getnetpath(). A "handle" is
|
|
* returned to distinguish the session; this handle should be passed
|
|
* subsequently to getnetpath(). (Handles are used to allow for nested calls
|
|
* to setnetpath()).
|
|
* If setnetpath() is unable to establish a session (due to lack of memory
|
|
* resources, or the absence of the /etc/netconfig file), a NULL pointer is
|
|
* returned.
|
|
*/
|
|
|
|
void *
|
|
setnetpath()
|
|
{
|
|
|
|
struct netpath_vars *np_sessionp; /* this session's variables */
|
|
char *npp; /* NETPATH env variable */
|
|
|
|
#ifdef MEM_CHK
|
|
malloc_debug(1);
|
|
#endif
|
|
|
|
if ((np_sessionp =
|
|
(struct netpath_vars *)malloc(sizeof (struct netpath_vars))) == NULL) {
|
|
return (NULL);
|
|
}
|
|
if ((np_sessionp->nc_handlep = setnetconfig()) == NULL) {
|
|
free(np_sessionp);
|
|
syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
|
|
goto failed;
|
|
}
|
|
np_sessionp->valid = NP_VALID;
|
|
np_sessionp->ncp_list = NULL;
|
|
if ((npp = getenv(NETPATH)) == NULL) {
|
|
np_sessionp->netpath = NULL;
|
|
} else {
|
|
(void) endnetconfig(np_sessionp->nc_handlep);/* won't need nc session*/
|
|
np_sessionp->nc_handlep = NULL;
|
|
if ((np_sessionp->netpath = malloc(strlen(npp)+1)) == NULL)
|
|
goto failed;
|
|
else {
|
|
(void) strcpy(np_sessionp->netpath, npp);
|
|
}
|
|
}
|
|
np_sessionp->netpath_start = np_sessionp->netpath;
|
|
return ((void *)np_sessionp);
|
|
|
|
failed:
|
|
free(np_sessionp);
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* When first called, getnetpath() returns a pointer to the netconfig
|
|
* database entry corresponding to the first valid NETPATH component. The
|
|
* netconfig entry is formatted as a struct netconfig.
|
|
* On each subsequent call, getnetpath returns a pointer to the netconfig
|
|
* entry that corresponds to the next valid NETPATH component. getnetpath
|
|
* can thus be used to search the netconfig database for all networks
|
|
* included in the NETPATH variable.
|
|
* When NETPATH has been exhausted, getnetpath() returns NULL. It returns
|
|
* NULL and sets errno in case of an error (e.g., setnetpath was not called
|
|
* previously).
|
|
* getnetpath() silently ignores invalid NETPATH components. A NETPATH
|
|
* compnent is invalid if there is no corresponding entry in the netconfig
|
|
* database.
|
|
* If the NETPATH variable is unset, getnetpath() behaves as if NETPATH
|
|
* were set to the sequence of default or visible networks in the netconfig
|
|
* database, in the order in which they are listed.
|
|
*/
|
|
|
|
struct netconfig *
|
|
getnetpath(handlep)
|
|
void *handlep;
|
|
{
|
|
struct netpath_vars *np_sessionp = (struct netpath_vars *)handlep;
|
|
struct netconfig *ncp = NULL; /* temp. holds a netconfig session */
|
|
struct netpath_chain *chainp; /* holds chain of ncp's we alloc */
|
|
char *npp; /* holds current NETPATH */
|
|
|
|
if (np_sessionp == NULL || np_sessionp->valid != NP_VALID) {
|
|
errno = EINVAL;
|
|
return (NULL);
|
|
}
|
|
if (np_sessionp->netpath_start == NULL) { /* NETPATH was not set */
|
|
do { /* select next visible network */
|
|
if (np_sessionp->nc_handlep == NULL) {
|
|
np_sessionp->nc_handlep = setnetconfig();
|
|
if (np_sessionp->nc_handlep == NULL)
|
|
syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
|
|
}
|
|
if ((ncp = getnetconfig(np_sessionp->nc_handlep)) == NULL) {
|
|
return(NULL);
|
|
}
|
|
} while ((ncp->nc_flag & NC_VISIBLE) == 0);
|
|
return (ncp);
|
|
}
|
|
/*
|
|
* Find first valid network ID in netpath.
|
|
*/
|
|
while ((npp = np_sessionp->netpath) != NULL && strlen(npp) != 0) {
|
|
np_sessionp->netpath = _get_next_token(npp, ':');
|
|
/*
|
|
* npp is a network identifier.
|
|
*/
|
|
if ((ncp = getnetconfigent(npp)) != NULL) {
|
|
chainp = (struct netpath_chain *) /* cobble alloc chain entry */
|
|
malloc(sizeof (struct netpath_chain));
|
|
chainp->ncp = ncp;
|
|
chainp->nchain_next = NULL;
|
|
if (np_sessionp->ncp_list == NULL) {
|
|
np_sessionp->ncp_list = chainp;
|
|
} else {
|
|
np_sessionp->ncp_list->nchain_next = chainp;
|
|
}
|
|
return (ncp);
|
|
}
|
|
/* couldn't find this token in the database; go to next one. */
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* endnetpath() may be called to unbind NETPATH when processing is complete,
|
|
* releasing resources for reuse. It returns 0 on success and -1 on failure
|
|
* (e.g. if setnetpath() was not called previously.
|
|
*/
|
|
int
|
|
endnetpath(handlep)
|
|
void *handlep;
|
|
{
|
|
struct netpath_vars *np_sessionp = (struct netpath_vars *)handlep;
|
|
struct netpath_chain *chainp, *lastp;
|
|
|
|
if (np_sessionp == NULL || np_sessionp->valid != NP_VALID) {
|
|
errno = EINVAL;
|
|
return (-1);
|
|
}
|
|
if (np_sessionp->nc_handlep != NULL)
|
|
endnetconfig(np_sessionp->nc_handlep);
|
|
if (np_sessionp->netpath_start != NULL)
|
|
free(np_sessionp->netpath_start);
|
|
for (chainp = np_sessionp->ncp_list; chainp != NULL;
|
|
lastp=chainp, chainp=chainp->nchain_next, free(lastp)) {
|
|
freenetconfigent(chainp->ncp);
|
|
}
|
|
free(np_sessionp);
|
|
#ifdef MEM_CHK
|
|
if (malloc_verify() == 0) {
|
|
fprintf(stderr, "memory heap corrupted in endnetpath\n");
|
|
exit(1);
|
|
}
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Returns pointer to the rest-of-the-string after the current token.
|
|
* The token itself starts at arg, and we null terminate it. We return NULL
|
|
* if either the arg is empty, or if this is the last token.
|
|
*/
|
|
|
|
char *
|
|
_get_next_token(npp, token)
|
|
char *npp; /* string */
|
|
int token; /* char to parse string for */
|
|
{
|
|
char *cp; /* char pointer */
|
|
char *np; /* netpath pointer */
|
|
char *ep; /* escape pointer */
|
|
|
|
if ((cp = strchr(npp, token)) == NULL) {
|
|
return (NULL);
|
|
}
|
|
/*
|
|
* did find a token, but it might be escaped.
|
|
*/
|
|
if ((cp > npp) && (cp[-1] == '\\')) {
|
|
/* if slash was also escaped, carry on, otherwise find next token */
|
|
if ((cp > npp + 1) && (cp[-2] != '\\')) {
|
|
/* shift r-o-s onto the escaped token */
|
|
strcpy(&cp[-1], cp); /* XXX: overlapping string copy */
|
|
/*
|
|
* Do a recursive call.
|
|
* We don't know how many escaped tokens there might be.
|
|
*/
|
|
return (_get_next_token(cp, token));
|
|
}
|
|
}
|
|
|
|
*cp++ = '\0'; /* null-terminate token */
|
|
/* get rid of any backslash escapes */
|
|
ep = npp;
|
|
while ((np = strchr(ep, '\\')) != 0) {
|
|
if (np[1] == '\\')
|
|
np++;
|
|
strcpy(np, (ep = &np[1])); /* XXX: overlapping string copy */
|
|
}
|
|
return (cp); /* return ptr to r-o-s */
|
|
}
|