minix/lib/libc/rpc/getnetpath.c
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify.
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

287 lines
8.6 KiB
C

/* $NetBSD: getnetpath.c,v 1.14 2008/05/24 16:04:15 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
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)getnetpath.c 1.11 91/12/19 SMI";
#else
__RCSID("$NetBSD: getnetpath.c,v 1.14 2008/05/24 16:04:15 christos Exp $");
#endif
#endif
/*
* Copyright (c) 1989 by Sun Microsystems, Inc.
*/
#include "namespace.h"
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <netconfig.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#ifdef __weak_alias
__weak_alias(getnetpath,_getnetpath)
__weak_alias(setnetpath,_setnetpath)
__weak_alias(endnetpath,_endnetpath)
#endif
/*
* 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 __P((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 = malloc(sizeof(*np_sessionp))) == NULL)
return (NULL);
if ((np_sessionp->nc_handlep = setnetconfig()) == NULL) {
free(np_sessionp);
syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
return (NULL);
}
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) {
free(np_sessionp);
return (NULL);
} else
(void) strcpy(np_sessionp->netpath, npp);
}
np_sessionp->netpath_start = np_sessionp->netpath;
return ((void *)np_sessionp);
}
/*
* 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) {
/* cobble alloc chain entry */
chainp = malloc(sizeof (struct netpath_chain));
if (chainp == NULL) {
freenetconfigent(ncp);
return NULL;
}
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(
char *npp, /* string */
int token /* char to parse string for */
)
{
char *cp; /* char pointer */
char *np; /* netpath pointer */
char *ep; /* escape pointer */
_DIAGASSERT(npp != NULL);
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 */
}