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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.
*
*/
#include <nfslib.h>
#include <stdio.h>
#include <ctype.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.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)
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;
}
static char qword_buf[8192];
void qword_print(FILE *f, char *str)
{
char *bp = qword_buf;
int len = sizeof(qword_buf);
qword_add(&bp, &len, str);
fwrite(qword_buf, bp-qword_buf, 1, f);
}
void qword_printhex(FILE *f, char *str, int slen)
{
char *bp = qword_buf;
int len = sizeof(qword_buf);
qword_addhex(&bp, &len, str, slen);
fwrite(qword_buf, bp-qword_buf, 1, f);
}
void qword_printint(FILE *f, int num)
{
fprintf(f, "%d ", num);
}
void qword_eol(FILE *f)
{
fprintf(f,"\n");
fflush(f);
}
#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 readline(int fd, char **buf, int *lenp)
{
/* read a line into *buf, which is malloced *len long
* realloc if needed until we find a \n
* nul out the \n and return
* 0 of eof, 1 of success
*/
int len = *lenp;
if (len == 0) {
char *b = malloc(128);
if (b == NULL)
return 0;
*buf = b;
*lenp = 128;
}
len = read(fd, *buf, len);
if (len <= 0)
return 0;
while ((*buf)[len-1] != '\n') {
/* now the less common case. There was no newline,
* so we have to keep reading after re-alloc
*/
char *new;
int nl;
*lenp += 128;
new = realloc(*buf, *lenp);
if (new == NULL)
return 0;
nl = read(fd, *buf +len, *lenp - len);
if (nl <= 0 )
return 0;
new += nl;
}
(*buf)[len-1] = 0;
return 1;
}
/* Check if we should use the new caching interface
* This succeeds iff the "nfsd" filesystem is mounted on
* /proc/fs/nfs
*/
int
check_new_cache(void)
{
struct stat stb;
return (stat("/proc/fs/nfs/filehandle", &stb) == 0);
}
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