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/*
* support/nfs/rmtab.c
*
* Handling for rmtab.
*
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <signal.h>
#include "nfslib.h"
/*
* Colons in incoming IPv6 presentation addresses have to
* replaced with another character, since rmtab already
* uses colons to delineate fields.
*
* Use a printable character, but one that would never be
* found in a presentation address or domain name
*/
#define IPV6_COLON ';'
#define LINELEN (2048)
static FILE *rmfp = NULL;
int
setrmtabent(char *type)
{
if (rmfp)
fclose(rmfp);
rmfp = fsetrmtabent(_PATH_RMTAB, type);
return (rmfp != NULL);
}
FILE *
fsetrmtabent(char *fname, char *type)
{
int readonly = !strcmp(type, "r");
FILE *fp;
if (!fname)
return NULL;
if ((fp = fopen(fname, type)) == NULL) {
xlog(L_ERROR, "can't open %s for %sing", fname,
readonly ? "read" : "writ");
return NULL;
}
return fp;
}
struct rmtabent *
getrmtabent(int log, long *pos)
{
return fgetrmtabent(rmfp, log, pos);
}
struct rmtabent *
fgetrmtabent(FILE *fp, int log, long *pos)
{
static struct rmtabent re;
char *count, *host, *path, *c;
static char buf[LINELEN];
errno = 0;
if (!fp)
return NULL;
do {
if (pos)
*pos = ftell (fp);
if (fgets(buf, sizeof(buf)-1, fp) == NULL)
return NULL;
host = buf;
if ((path = strchr(host, '\n')) != NULL)
*path = '\0';
if (!(path = strchr(host, ':'))) {
if (log)
xlog(L_ERROR, "malformed entry in rmtab file");
errno = EINVAL;
return NULL;
}
*path++ = '\0';
count = strchr(path, ':');
if (count) {
*count++ = '\0';
re.r_count = strtol (count, NULL, 0);
}
else
re.r_count = 1;
} while (0);
strncpy(re.r_client, host, sizeof (re.r_client) - 1);
re.r_client[sizeof (re.r_client) - 1] = '\0';
for (c = re.r_client; *c != '\0'; c++)
if (*c == IPV6_COLON)
*c = ':';
strncpy(re.r_path, path, sizeof (re.r_path) - 1);
re.r_path[sizeof (re.r_path) - 1] = '\0';
return &re;
}
void
putrmtabent(struct rmtabent *rep, long *pos)
{
fputrmtabent(rmfp, rep, pos);
}
void
fputrmtabent(FILE *fp, struct rmtabent *rep, long *pos)
{
static char buf[LINELEN];
char *c;
if (!fp || (pos && fseek (fp, *pos, SEEK_SET) != 0))
return;
/*
* To avoid confusing the token parser in fgetrmtabent(),
* convert colons in incoming IPv6 presentation addresses
* to semicolons.
*/
if (strlen(rep->r_client) > sizeof(buf)) {
xlog(L_ERROR, "client name too large");
return;
}
strncpy(buf, rep->r_client, sizeof(buf));
for (c = buf; *c != '\0'; c++)
if (*c == ':')
*c = IPV6_COLON;
(void)fprintf(fp, "%s:%s:0x%.8x\n", buf, rep->r_path, rep->r_count);
}
void
endrmtabent(void)
{
fendrmtabent(rmfp);
rmfp = NULL;
}
void
fendrmtabent(FILE *fp)
{
if (fp) {
static int have_new_cache = -1;
if (have_new_cache == -1) /* check only once */
have_new_cache = check_new_cache();
if (!have_new_cache) {
/*
* If we are using the old caching interface: exportfs
* uses the rmtab to determine what should be exported,
* so it is important that it be up-to-date.
*
* If we are using the new caching interface: the rmtab
* is ignored by exportfs and the fdatasync only serves
* to slow us down.
*/
fflush(fp);
fdatasync(fileno(fp));
}
fclose(fp);
}
}
void
rewindrmtabent(void)
{
if (rmfp)
rewind(rmfp);
}
void
frewindrmtabent(FILE *fp)
{
if (fp)
rewind (fp);
}
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