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/*
* support/nfs/cacheio.c
* support IO on the cache channel files in 2.5 and beyond.
* These use 'qwords' which are like words, but with a little quoting.
*
*/
/*
* Support routines for text-based upcalls.
* Fields are separated by spaces.
* Fields are either mangled to quote space tab newline slosh with slosh
* or a hexified with a leading \x
* Record is terminated with newline.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <nfslib.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include <errno.h>
void qword_add(char **bpp, int *lp, char *str)
{
char *bp = *bpp;
int len = *lp;
char c;
if (len < 0) return;
while ((c=*str++) && len > 0)
switch(c) {
case ' ':
case '\t':
case '\n':
case '\\':
if (len >= 4) {
*bp++ = '\\';
*bp++ = '0' + ((c & 0300)>>6);
*bp++ = '0' + ((c & 0070)>>3);
*bp++ = '0' + ((c & 0007)>>0);
}
len -= 4;
break;
default:
*bp++ = c;
len--;
}
if (c || len <1) len = -1;
else {
*bp++ = ' ';
len--;
}
*bpp = bp;
*lp = len;
}
void qword_addhex(char **bpp, int *lp, char *buf, int blen)
{
char *bp = *bpp;
int len = *lp;
if (len < 0) return;
if (len > 2) {
*bp++ = '\\';
*bp++ = 'x';
len -= 2;
while (blen && len >= 2) {
unsigned char c = *buf++;
*bp++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
*bp++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
len -= 2;
blen--;
}
}
if (blen || len<1) len = -1;
else {
*bp++ = ' ';
len--;
}
*bpp = bp;
*lp = len;
}
void qword_addint(char **bpp, int *lp, int n)
{
int len;
len = snprintf(*bpp, *lp, "%d ", n);
if (len > *lp)
len = *lp;
*bpp += len;
*lp -= len;
}
void qword_adduint(char **bpp, int *lp, unsigned int n)
{
int len;
len = snprintf(*bpp, *lp, "%u ", n);
if (len > *lp)
len = *lp;
*bpp += len;
*lp -= len;
}
void qword_addeol(char **bpp, int *lp)
{
if (*lp <= 0)
return;
**bpp = '\n';
(*bpp)++;
(*lp)--;
}
#define isodigit(c) (isdigit(c) && c <= '7')
int qword_get(char **bpp, char *dest, int bufsize)
{
/* return bytes copied, or -1 on error */
char *bp = *bpp;
int len = 0;
while (*bp == ' ') bp++;
if (bp[0] == '\\' && bp[1] == 'x') {
/* HEX STRING */
bp += 2;
while (isxdigit(bp[0]) && isxdigit(bp[1]) && len < bufsize) {
int byte = isdigit(*bp) ? *bp-'0' : toupper(*bp)-'A'+10;
bp++;
byte <<= 4;
byte |= isdigit(*bp) ? *bp-'0' : toupper(*bp)-'A'+10;
*dest++ = byte;
bp++;
len++;
}
} else {
/* text with \nnn octal quoting */
while (*bp != ' ' && *bp != '\n' && *bp && len < bufsize-1) {
if (*bp == '\\' &&
isodigit(bp[1]) && (bp[1] <= '3') &&
isodigit(bp[2]) &&
isodigit(bp[3])) {
int byte = (*++bp -'0');
bp++;
byte = (byte << 3) | (*bp++ - '0');
byte = (byte << 3) | (*bp++ - '0');
*dest++ = byte;
len++;
} else {
*dest++ = *bp++;
len++;
}
}
}
if (*bp != ' ' && *bp != '\n' && *bp != '\0')
return -1;
while (*bp == ' ') bp++;
*bpp = bp;
*dest = '\0';
return len;
}
int qword_get_int(char **bpp, int *anint)
{
char buf[50];
char *ep;
int rv;
int len = qword_get(bpp, buf, 50);
if (len < 0) return -1;
if (len ==0) return -1;
rv = strtol(buf, &ep, 0);
if (*ep) return -1;
*anint = rv;
return 0;
}
int qword_get_uint(char **bpp, unsigned int *anint)
{
char buf[50];
char *ep;
unsigned int rv;
int len = qword_get(bpp, buf, 50);
if (len < 0) return -1;
if (len ==0) return -1;
rv = strtoul(buf, &ep, 0);
if (*ep) return -1;
*anint = rv;
return 0;
}
/* flush the kNFSd caches.
* Set the flush time to the mtime of the etab state file or
* if force, to now.
* the caches to flush are:
* auth.unix.ip nfsd.export nfsd.fh
*/
void
cache_flush(void)
{
int c;
char stime[32];
char path[200];
time_t now;
/* Note: the order of these caches is important.
* They need to be flushed in dependancy order. So
* a cache that references items in another cache,
* as nfsd.fh entries reference items in nfsd.export,
* must be flushed before the cache that it references.
*/
static char *cachelist[] = {
"auth.unix.ip",
"auth.unix.gid",
"nfsd.fh",
"nfsd.export",
NULL
};
now = time(0);
/* Since v4.16-rc2-3-g3b68e6ee3cbd the timestamp written is ignored.
* It is safest always to flush caches if there is any doubt.
* For earlier kernels, writing the next second from now is
* the best we can do.
*/
sprintf(stime, "%" PRId64 "\n", (int64_t)now+1);
for (c=0; cachelist[c]; c++) {
int fd;
sprintf(path, "/proc/net/rpc/%s/flush", cachelist[c]);
fd = open(path, O_RDWR);
if (fd >= 0) {
if (write(fd, stime, strlen(stime)) != (ssize_t)strlen(stime)) {
xlog_warn("Writing to '%s' failed: errno %d (%s)",
path, errno, strerror(errno));
}
close(fd);
}
}
}
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