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-rw-r--r--src/getnetpath.c261
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diff --git a/src/getnetpath.c b/src/getnetpath.c
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+/*
+ * Copyright (c) 2009, Sun Microsystems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * - Neither the name of Sun Microsystems, Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Copyright (c) 1989 by Sun Microsystems, Inc.
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include <netconfig.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.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) {
+ syslog (LOG_ERR, "rpc: failed to open " NETCONFIG);
+ free(np_sessionp);
+ 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) {
+ 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 */
+}
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