Initial commit of libtirpc 0.1.7

Signed-off-by: Steve Dickson <steved@redhat.com>

1 files changed, 264 insertions, 0 deletions

diff --git a/src/getnetpath.c b/src/getnetpath.c
new file mode 100644
index 0000000..ccded4e
--- /dev/null
+++ b/src/getnetpath.c
@@ -0,0 +1,264 @@
+/*
+ * 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>
+
+/*
+ * Copyright (c) 1989 by Sun Microsystems, Inc.
+ */
+
+#include <sys/cdefs.h>
+#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);
+	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 */
+}